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direction of vibrating screen

vibration frequency, screen inclination of the vibrating screen | lzzg

vibration frequency, screen inclination of the vibrating screen | lzzg

Vibration characteristics include vibration frequency, amplitude, vibration direction angle, and screen inclination. If these parameters are set incorrectly, it will affect the working efficiency of the vibrating screen. The correct way is: 1. Screen angle The angle between the screen surface and the horizontal plane is called the screen angle. The size of the dip is closely related to the throughput of the screening equipment and the screening efficiency. When the inclination angle is increased, the throwing strength of the material on the sieve will be increased, so that the forward movement speed of the material on the sieve surface is accelerated, so that the treatment amount of the vibrating screen is increased, but the residence time of the material on the sieve surface is shortened, and the opportunity for screening the sieve is reduced. , thereby reducing the screening efficiency. On the contrary, the throughput is reduced and the screening efficiency is improved. In order to control the screening efficiency of the vibrating screen to a relatively ideal range, the screen inclination angle of the circular vibrating screen is generally between 15-25, and the screen inclination angle of the linear vibrating screen is between 0 and 8. 2. The angle between the vibration direction angle vibration direction line and the upper screen surface is called the vibration direction angle. The larger the value of the vibration direction angle is, the shorter the distance moved by the material is, and the slower the movement speed of the material on the screen surface, the material can be fully sieved, thereby obtaining a larger screening efficiency. The smaller the value of the vibration direction angle is, the farther the material throws and advances each time. The faster the material passes through the screen surface, the higher the processing capacity, but the material cannot be fully sieved. Therefore, the vibration direction angle should be reasonably selected. For difficult-to-screen materials, the vibration direction angle should be taken as a large value. For easy-screen materials, the vibration direction angle should be small; in general, the vibration direction angle of the circular vibrating screen is 90. The vibrating direction angle of the linear vibrating screen ranges from 30 to 60, often 45. This value not only has good performance for various screening but also obtains the best moving speed and high productivity. circular vibrating screen 3. The amplitude A amplitude increases, the mesh plugging phenomenon will be greatly reduced, and it is also conducive to the stratification of materials. However, too large amplitude is also destructive to the device. The choice of amplitude is based on the particle size and nature of the material being screened. In general, the larger the vibrating screen size, the larger the amplitude selected. When the linear vibrating screen is used for classification, the amplitude is slightly larger; when used for dehydration and deliming, the amplitude should be smaller. When the particle size of the treated material is large, the amplitude should be correspondingly increased; when the particle size of the treated material is small, the amplitude should be smaller. Usually, the amplitude of the linear vibrating screen is A=3.5~6mm. 4. The increase of vibration frequency vibration frequency can increase the number of times the material beats on the screen surface, which increases the probability of material permeability. This is helpful for speeding up the material screening speed and improving the screening efficiency, but it is too high. Reduce the life of your equipment. For larger particle sizes, use larger amplitudes and lower frequencies; for finer particles, use smaller amplitudes and higher frequencies.

Vibration characteristics include vibration frequency, amplitude, vibration direction angle, and screen inclination. If these parameters are set incorrectly, it will affect the working efficiency of the vibrating screen. The correct way is:

1. Screen angle The angle between the screen surface and the horizontal plane is called the screen angle. The size of the dip is closely related to the throughput of the screening equipment and the screening efficiency. When the inclination angle is increased, the throwing strength of the material on the sieve will be increased, so that the forward movement speed of the material on the sieve surface is accelerated, so that the treatment amount of the vibrating screen is increased, but the residence time of the material on the sieve surface is shortened, and the opportunity for screening the sieve is reduced. , thereby reducing the screening efficiency. On the contrary, the throughput is reduced and the screening efficiency is improved. In order to control the screening efficiency of the vibrating screen to a relatively ideal range, the screen inclination angle of the circular vibrating screen is generally between 15-25, and the screen inclination angle of the linear vibrating screen is between 0 and 8.

2. The angle between the vibration direction angle vibration direction line and the upper screen surface is called the vibration direction angle. The larger the value of the vibration direction angle is, the shorter the distance moved by the material is, and the slower the movement speed of the material on the screen surface, the material can be fully sieved, thereby obtaining a larger screening efficiency. The smaller the value of the vibration direction angle is, the farther the material throws and advances each time. The faster the material passes through the screen surface, the higher the processing capacity, but the material cannot be fully sieved. Therefore, the vibration direction angle should be reasonably selected. For difficult-to-screen materials, the vibration direction angle should be taken as a large value. For easy-screen materials, the vibration direction angle should be small; in general, the vibration direction angle of the circular vibrating screen is 90. The vibrating direction angle of the linear vibrating screen ranges from 30 to 60, often 45. This value not only has good performance for various screening but also obtains the best moving speed and high productivity.

3. The amplitude A amplitude increases, the mesh plugging phenomenon will be greatly reduced, and it is also conducive to the stratification of materials. However, too large amplitude is also destructive to the device. The choice of amplitude is based on the particle size and nature of the material being screened. In general, the larger the vibrating screen size, the larger the amplitude selected. When the linear vibrating screen is used for classification, the amplitude is slightly larger; when used for dehydration and deliming, the amplitude should be smaller. When the particle size of the treated material is large, the amplitude should be correspondingly increased; when the particle size of the treated material is small, the amplitude should be smaller. Usually, the amplitude of the linear vibrating screen is A=3.5~6mm.

4. The increase of vibration frequency vibration frequency can increase the number of times the material beats on the screen surface, which increases the probability of material permeability. This is helpful for speeding up the material screening speed and improving the screening efficiency, but it is too high. Reduce the life of your equipment. For larger particle sizes, use larger amplitudes and lower frequencies; for finer particles, use smaller amplitudes and higher frequencies.

The excitation force, vibration frequency and screening effect of the dewatering screen are closely related. Too small excitation force will cause poor screening effect, and excessive excitation force may cause damage to the screen plate.How to adjust the vibrating screen. 1. Control of screening area The width of the screen surface is the main factor that determines the production rate

Silica sand is the main raw material for making ceramics and glass, so the market demand has been high. It is mainly processed by crushing, powdering, and iron removal. Fine silica sand removal methods instruction. The mechanical equipment required in the silica sand dry iron removal method is a crusher, a dry ball mill, a dry iron remover, a dry

Drum rotating aggregate screening machine also called trommel screen according to its structure. It uses the self-weight of sand and gravel aggregates and the isolation effect of the mesh to separate sand and gravel materials of different sizes. The inclination of the central axis is 22.5 degrees. It can discharge l530m3 per hour. When the screen is moved, it is

After the raw sand is mined, the finished sand is obtained after washing rod milling, classification, homogenization, and dehydration. The raw sand with particles below 10mm from the raw ore mining is conveyed into the rod mill through a belt. At the same time, add water according to a certain proportion and grind it into mortar and drain into the

types of vibrating screens | introduction and difference

types of vibrating screens | introduction and difference

Vibrating screen is equipment for separating material sizes. There are many types of vibrating screens, such as horizontal screen, inclined screen, MD vibratory screen, rotary screen, vibratory screen, high-frequency screen, grizzly screen, dewatering screen, and other industrial screens. What is the difference between these types of vibrating screens?

Vibratory screen is a rectangular single-, double-, and multi-layer, high-efficiency new screening equipment. Vibrating screen can be divided into inclined and horizontal screen. At present, the screens range in width from 4-12 to 8-32. The screen size is usually set to 2.5 times its length and width. The width of the sieve determines the maximum carrying capacity of the sieve plate, and the length of the sieve determines the overall efficiency of the sieve plate. The vibrating screen is generally composed of a vibrator, a screen box, a supporting or hanging device, a transmission device, and others.

Horizontal screens are named because they are designed to be horizontal. The work direction of the screen is parallel to the ground or has a slope of 0 to 5. It is a triple-shaft screen, which uses for fixed and portable production lines. Compared with the inclined screen, it is more accurate and effective to determine the size and separate materials. This is because the material is retained on the screen for a longer period of time, which allowing sufficient time for the sized material to fall off the screen. The screen has the advantages of simple structure, reliable performance, large screening capacity, and economical use. Its low power consumption and low maintenance cost, it is the simplest and most practical screening equipment in the quarry crusher plant.

Vibrating inclined screen is the most popular types of vibrating screens. The screen fix to the tilted frame at an angle of 15 to 30 degrees. The inclined screen is usually designed in a multi-layer structure and can be classified into 2-5 grades. And the screen can be adjusted to provide overall performance and efficiency. We can adjust the slope, speed, and direction according to the application.

The inclined screen consists of eight basic components, namely side wall, platform, screening medium, actuator, motor, motor console, spring, and the spring bracket. The key factor of inclined screen equipment is its weldless design. All the 8 basic screen parts are assembled by bolt and nut connections to prevent screen cracking and failure due to welding.

MD vibrating screen is a compact, high capacity dry screen. It widely used in industries of dry sand, fertilizer, iron ore, wood chips, limestone, and others. It can screen more tons per hour. Compare with the traditional screening equipment, its processing capacity is bigger. Because of its excellent design, it takes up less space and reduces the size of the screen layer by layer. As a result, it can screen out products of many different sizes at the same time.

The trommel screen uses continuous rolling and lifting motions to screen and separate raw materials. These materials include municipal waste, recycling, industry, aggregates, and mining. This screen is a kind of machine which is widely used in separation technology. By the size of the particle size to control the screening. The barrel of the screen is generally divided into several sections which depending on the specific circumstances. The screen holes from small to large arrangements, each section on the same size as the screen hole. The screening equipment features: screen hole is not easy to plug. The screen cylinder can be closed, easy to close the dust collection. Adopt Special Screen Mesh, high screening efficiency, and long service life.

Working principle As the cylinder of the rotating sieve rotates, the raw material is lifted from the shelf until it is near the top of the cylinder. Then, the material falls, landing on other material at the bottom of the drum. This operation helps to break down the softer parts as well as separate the different types of materials. As the tumbling continues, smaller fractions are filtered through holes in the sieve plate. While the larger material continues along the length of the cylinder, finally discharging.

High-frequency screen with high efficiency, small amplitude, high screening frequency. It is effective equipment for screening and classification of fine-grained materials. It is widely used in screening and classification of iron ore, tin, tungsten, tantalum, and niobium. For the high-frequency screen, it is solely for the purpose of dehydration wet screening. Therefore, we hope to form a filtering layer on the screen surface as soon as possible, so as to block the passage of fine coal. Thus reducing the loss of solid materials in water and improving the recovery rate of solid. If the screen surface amplitude is too large, it will destroy the filter layer. Wet screening doesnt require large amplitudes.

High-frequency screen with high frequency can destroy the pulp surface tension and fine material in screen surface high-speed oscillation. This operation not only accelerates the density of useful minerals and segregation but also increases the probability of less than the size of the separation material in contact with the screen hole. Thus create a better separation condition which made the material smaller than the separation granularity. In particular, a large density of material and pulp together through the screen hole sieve out. It can provide higher capacity and more efficient dimensions than traditional screening devices.

Grizzly screen is universal screen equipment with special screen surface. Its biggest characteristic lies in its high screening efficiency, large relative processing capacity and not easy to plug holes. Especially suitable for high moisture, viscous material screening. It is widely used in the coal mine, chemical industry, metallurgy, electric power, building materials, and other industries that the medium-sized granular material classification. The advantages of the grizzly screens are a simple structure, convenient maintenance, high strength, impact resistance, wear resistance, low noise and so on.

Working principle: Grizzly screen is composed of many bars. Screen surface and horizontal composition of an angle. When screening ore dip angle is 40 ~ 45. When screening wet material dip angle increases 5 ~ 10. The material is fed through the upper end of the screen. The ore block larger than the size of the screen hole slides automatically along the screen surface. The ore block smaller than the size of the screen hole falls through the screen hole.

Dewatering screen is the main role of dewatering, desliming, desilting medium. It is used for sand washing plants, coal slime recovery in the coal preparation plants, tailings dry discharge in the mineral processing plants, etc. Therefore, it is also called sand dewatering screen, mine dewatering screen, slime dewatering screen, tailings dry drainage screen, high-frequency dewatering screen, etc.

The screen Mesh adopts super high molecular polyurethane material, impact resistance, corrosion resistance, wear resistance. The screen box is made of stainless steel. The screening machine is especially suitable for treating fine-grained minerals. It can also be used in combination with a cyclone. Dewatering efficiency is very high and widely used in tailings dry discharge, dewatering, and other operations.

Jiangxi Shicheng stone crusher manufacturer is a new and high-tech factory specialized in R&D and manufacturing crushing lines, beneficial equipment,sand-making machinery and grinding plants. Read More

vibrating screen types & working principle [how to choose] | m&c

vibrating screen types & working principle [how to choose] | m&c

According to different structure and use, vibrating screens usually be devided into many types by the vibrating screen manufacturers. Below wil introduce the top 10 vibrating screens, and how to choose the right vibratory screen?

linear vibrating screen is driven by double vibrating motors. When the two vibrating motors are rotating synchronously and reversely, the excitation force generated by the eccentric block offsets each other in the direction parallel to the axis of the motor, and overlaps into a resultant force in the direction perpendicular to the axis of the motor, so the motion track of the linear vibrating screen machine is a straight line.

Working Principle:The two motor axes of the linear vibrating screen have an angle of inclination in the vertical direction relative to the screen panel. Under the combined force of the exciting force and the self gravity of the material, the material is thrown on the screen surface to jump or move forward in a straight line. Through the multi-layer screen panels, a variety of specifications of materials are generated, and discharged from their respective outlets, so as to achieve screening and classification. linear vibrating screen is suitable for screening various dry powder or granular materials with particle size of 0.074-5mm, moisture content <7%, and no viscosity. The feed particle size is not more than 10 mm.

Circular vibrating screen is a new type of vibrating screen with multi-layer screen and high efficiency. According to the type of materials and the requirements of users, the high manganese steel woven screen, punched screen plate and rubber screen plate can be used. The circular vibrating screen is installed in the seat type. The adjustment of the screen surface angle can be realized by changing the position and height of the spring support.

Working Principle: The motion track of the screen box of the circular vibrating screen is circular. The circular vibrating screen uses the inertia exciter to produce vibration. The main shaft fixed on the screen box is driven by the motor to rotate at high speed, and the eccentric body installed on the main shaft rotates with it, generating centrifugal inertia force, so that the screen box that can freely vibrate will produce vibration similar to the circular track.

Circular vibrating screen is widely used in the materials classification of mining, building materials, transportation, energy, chemical industry and other industries because of its long flowing line and many screening specifications.

Elliptical vibrating screen is a vibrating screen with elliptical motion track (Elliptical Shale Shaker), which has the advantages of high efficiency, high screening accuracy and wide range of application. Compared with the ordinary sieve machine of the same specification, it has larger processing capacity and higher screening efficiency.

Triaxial elliptical vibrating screen is widely used for the screening operation of sand and stone materials in sand plant. It is the ideal screening equipment for all kinds of mines, quarries and mobile screening stations.

Working Principle: The power is transmitted from the motor to the main shaft of the exciter and the gear vibrator (speed ratio is 1) through the V-belt, so that the three shafts can rotate at the same speed and generate the exciting force. The exciter is connected with the high-strength bolts of the screen box, resulting in elliptical movement.

Materials on the screens do high-speed elliptical movement along with the screen machine, so as to achieve uickly separate, sift and move forward, and ultimately complete the classification of materials.

The working surface of the roller screen is composed of a series of rolling shafts that arranged horizontally, on which there are many screen plates. When working, the fine material passes through the gap between the roller or screen plate, large blocks of materials are driven by rollers, moving to the ends and discharging from the outlets. Roller screens are mostly used in the traditional coal industry.

Working Principle: For the rolling shafts are arranged according to different working angles, the speed of the material is faster when it runs in the position with higher working angle; the speed of the material is slower when it runs in the position with lower working angle.

When two kinds of materials running at different speeds converge at a certain position on the screen surface, they start to move axially, so that the materials are evenly distributed on the screen surface, and the screening efficiency is improved.

Rotary vibrating screen is mainly used for the classification of materials with high screening efficiency and fine screening accuracy. Fully closed structure, no flying powder, no leakage of liquid, no blocking of mesh, automatic discharge, no material storage in the machine, no dead angle of grid structure, increased screen area.

Any particle, powder and mucus can be screened within a certain range. Sieve to 500 mesh or 0.028mm, filter to 5 microns minimum. It can be used for classification, classification and filtration in food, chemical, metal, mining and other industries.

With the help of the heavy hammer installed at the upper and lower ends of the motor shaft, the rotary motion of the motor is transformed into a horizontal, vertical and inclined three-dimensional motion, which is then transmitted to the screen surface to make the material do an outward involute motion on the screen surface. Working Principle: After the rotary screen is started, the eccentric blocks of different phases at the upper and lower ends of the vibrating motor generate a composite inertia force, which forces the vibrating body of the rotary screen machine to rotate again and again, and the screen frame continuously moves to and fro under the action of the vibration force, and then drives the screen surface to vibrate periodically, so that the materials on the screen surface move in a positive and directional manner together with the screen box. Materials smaller than the screen meshes fall to the lower layer, and the materials larger than the screen meshes discharged from the discharge port.

High frequency vibrating screen is also called high frequency screen for short. High frequency vibrating screen (high frequency screen) is composed of exciter, pulp distributor, screen frame, supporting, suspension spring and screen, etc. High frequency vibrating screen is the most important screening machine in mineral processing industry, which is suitable for completely wet or dry raw materials.

Working Principle: Different from ordinary screening equipments, high frequency screen adopts high frequency, which destroys the tension on the pulp surface and makes the fine materials vibrate at high speed on the screen, accelerates the separation of useful minerals with large density (specific gravity), and increases the probability of contact between the materials with smaller than the separated particle size and the screen holes.

As a result, high frequency screen results in a better separation conditions, which makes the materials that smaller than the separation size (especially with larger specific gravity), and pulp pass through the screen holes together to complete the screening. High-frequency vibrating screen is usually operated at an inclined angle 0-25, up to 45, and the operating frequency range is 1500-7200r/m.

Grizzly screen has simple and solid structure, no power consumption, no moving parts, low equipment cost and convenient maintenance, but the productivity is low, the screening efficiency is not high, generally 50% 60%, and the mesh is easy to be blocked.

Working Principle: Generally, the grizzly screen is placed in an inclined position, and the materials are dumped at the high end. Under the action of its own weight, it slides down the screen surface, and the particles smaller than the gap or hole on the screen surface pass through the screen to achieve classification.

Banana screen is mainly suitable for the classification of large and medium-sized materials with high content of fine particles, and it can also be used for dehydration, demineralization and desliming.

Working Principle: During operation, the motor is connected with the vibration exciter through the V-belt or soft connection. The motor drives the eccentric shaft to rotate to generate centrifugal inertia force, which forces the screen box to vibrate. After the materials fall into the screen from the feeding inlet, they move forward rapidly under the action of the vibration force, loosely and pass through the screen.The thickness of the material layer of banana screen from the feeding inlet to the discharging outlet is constant. The ratio of the material quantity to the flow speed on the screen of each section is stable, the material layer is high and uniform. The screening efficiency of banana screen is higher, which is 1-2 times higher than that of other screening machines with the same effective area.

Heavy inclined screen can be applied to the treatment of debris from quarry, mine and building demolition, the treatment of topsoil, the recycling of construction materials, the screening of gravel, and the screening of gravel and aggregates.

Working Principle: The screen box shaft is driven by the motor installed on the auxiliary frame through three V-belts, the auxiliary frame is rigidly connected with the machine underframe, and the screen box spring is used to support the screen box.Inclined screen usually adopts 2-4-layer screen panels, and is fixed on the inclined frame at an angle between 15 and 30. The material can be screened into 3-5 grades at the same time.

Horizontal screen has the advantages of both inclined screen and linear vibrating screen. horizontal screen has the features of good screen permeability, large processing capacity and small installation height.

The installation angle of common vibrating screen is 15-30, while the installation of horizontal screen is parallel to the ground, or slightly inclined 0-5. Horizontal screen is an ideal equipment for all kinds of mines, quarries and mobile screening stations.

Working Principle: Horizontal screen is designed with oval stroke. The advantage of this design is that it can change the oval big diameter length and angle of throwing material stroke to meet the best needs of vibrating screen. The oval stroke is easy to adjust by center gear, counterweight wheel and motor speed.

Different types of vibrating screens can be used for the same material to get different screening effects. The reasonable selection of vibrating screen is an effective way to improve vibration efficiency and maximize economic benefits. Generally, you need to consider the following 5 tips:

When choosing vibratory screen, the material characteristics should be taken into account, including the content of material particles under the screen, the content of difficult screen particles, material moisture, the shape and specific gravity of the material, and the content of clay.

Tips: Heavy vibrating screen is used for materials above 200mm; circular vibrating screen is used for materials above 10mm; linear vibrating screen and high frequency vibrating screen are used for desliming, dewatering and grading.

When selecting the vibratory screen, the screen areas, layer numbers, shape, size and area ratio of the screen holes, as well as the motion mode, vibration frequency and amplitude of the vibrating screen should also be considered.

Tips: In order to keep the screens under good working conditions, the ratio of screen length to width should be in the range of 2-3; when there is much viscous mud and high moisture in the material, double deck screens should be avoided as far as possible.

Vibratory screens need to be selected according to different screening purposes. If it is necessary to pre screen materials, circular vibrating screens are generally used; for the classification and screening of crushed materials, large vibrating screens and probability screens are selected; for the deionization and dehydration of materials, linear vibrating screens are better; if it is necessary to desliminate and clean up materials, probability screens are used.

When selecting the shale shakers, it also needs to be considered according to the processing capacity of the production line, screening method, screening efficiency and the tilt angle of the shale shakers.

Professional vibrating screen manufacturers could provide competitive vibrating screen price, diversity customized vibrating screen models, timely after-sales service, spare parts and can continue to provide services for customers whole production circle.

five parameters affect screening efficiency of vibrating screen - xinhai

five parameters affect screening efficiency of vibrating screen - xinhai

In the mineral processing production, many mine owners may have met various problems, like the vibrating screen cannot reach the expected processing capacity, the screening efficiency is too low. As important screening equipment, the screening efficiency of the vibrating screen will directly affect the final product quality and investment cost.

Generally, the screening efficiency of vibrating screen is related to many factors, such as material properties, equipment structure and various performance parameters. In addition to the hard factors of material properties and equipment structure, we mainly start from the performance parameters and analyze the influence of each performance parameters on the screening efficiency of vibrating screen, including amplitude, vibration frequency, vibration direction angle, screen surface inclination angle and projectile angle, so as to provide a reference for vibrating screen operators.

Generally, the larger model the vibrating screen, the larger the selected amplitude. If the amplitude of the vibrating screen is larger, the phenomenon of screen hole blockage will be less, which is more conducive to the screening of ore stratification, and obtain better screening production capacity. However, it should be noted that if the amplitude of the vibrating screen is too large, the strong vibration will cause relatively large damage to the vibrating screen itself. The vibration screen amplitude selection is usually determined by the ore size and properties, when the ore particles are small, wet and also have a certain viscosity, we need to use low frequency, large amplitude.

In addition, the corresponding amplitudes and frequencies should be selected for different screening stages. For example, the screening operations used before the separation generally use low frequency, the large amplitude of vibration, dehydration, the disintermediation operations generally uses high frequency, small amplitude.

The vibration frequency has a direct influence on the pulsation state of ore particles on the screen surface. Taking high frequency vibrating screen as an example, its high frequency can well break the tension of pulp surface, makes fine material oscillate at high speed on the screen surface, accelerates the separation of useful minerals, and increases the probability of contact between material with less than separated particle size and sieve hole, thus creating good screening conditions. Too high or too low vibration frequency is not beneficial to screening efficiency vibrating screen.

According to the study, no matter what screening operation the vibrating screen carries out, the vibration frequency is maintained at 850-1000 times/minute as an ideal choice. If the frequency is too low and the vibration intensity is the same, the weight of the eccentric block of the vibrator will increase accordingly, which is not economical enough. At the same vibration intensity, the higher frequency will greatly affect the running speed of the ore, which means that the processing capacity is reduced. Therefore, the vibration frequency is not adjusted at will, must be adjusted to the appropriate range according to the actual situation of the selection plant to make the vibrating screen play the ideal performance.

Slope angle of screen surface refers to the included angle between screen surface and horizontal plane. The size of its angle is closely related to the processing capacity and screening efficiency of the vibrating screen. When the inclination angle of the screen surface increases, the movement speed of ore particles on the screen surface becomes faster, and the processing capacity increases accordingly. However, the residence time of ore particles on the screen surface is correspondingly shorter at the same time, which affects the screening efficiency of the vibrating screen.

The slope angle of screen surface is determined according to the material application and actual production needs. The horizontal vibrating screen is recommended for fine screening. If the granularity of screening material is large and the screening rate is good, the slope angle can adopt 5-10. If the particles are large and overgrinding, the slope angle can adopt 15. The reasonable range of slope angle is based on the uniform distribution of material particles. Installation inclination of different types of vibrating screen is different, the installation inclination of high frequency vibrating screen is about 30, the inclination of vibrating screen used for the general purpose is 0-15.

The vibration direction angle mentioned here refers to the included angle between the screen motion direction and the screen surface, which is generally denoted by . When determining the vibrating direction angle, the first thing should be considered is the nature of the ore being screened. For the ore with high density or fine particle size, easy to be crushed, the vibrating direction angle of the vibrating screen should be large. For those minerals with large water content, strong viscosity or abrasion resistance, the vibrating direction angle of the vibrating screen should be small.

In actual production, most linear vibrating screen adopt the vibrating direction angle as 30, 45 and 60, which can not only better adapt to various screening performance, but also obtain the best moving speed and screening efficiency. The vibrating direction angle of the circular vibrating screen is 90, so the circular vibrating screen needs to be installed at an angle, otherwise the minerals will not move forward.

According to the screening theory and practice, the size and strength of the projection angle of the vibrating screen have a direct influence on the screening of the ore on the screen surface. When the projection strength of the vibrating screen of ore increases, the inertial force is also larger, the ore can be thrown higher, which is more conducive to the screening. However, too much projection strength will inevitably affect the screen box, making it premature damage. Therefore, the size and strength of the projection angle should consider the structural strength of the screen box.

In the actual use of the process, different types of vibrating screen will certainly have some differences. It is suggested that all mine owners look for equipment manufacturers with the qualification of mineral processing EPC+M+O service to purchase the appropriate vibrating screen, and determine the value of each parameter according to the actual situation of the mineral processing plant, so as to obtain the ideal screening efficiency of the vibrating screen.

what is vibrating screen mesh|types, specifications and application | quarrying & aggregates

what is vibrating screen mesh|types, specifications and application | quarrying & aggregates

The quarry vibrating screen is mainly used to screen gravel, and the quality of the screen mesh determines the material screening efficiency. Therefore, quarry investors or equipment purchasers will ask the manufacturer for information about vibrating screen media types when choosing a vibrating screen.

Rayco designs and manufactures a complete set of high quality and cost-effective rubber screens. They are used to treat the roughest and most abrasive products, such as gravel, coal, slag, etc. Rubber material is soft and powerful, can absorb shock and have long service life, which not only can reduce the downtime, but also makes installation easier and faster. If noise reduction is required, rubber screens are good choices.

Rayco rubber sieve can be divided into two kinds: tension and modular. The tension type can be installed as a circular vibrating screen and replace the original metal screen or polyurethane screen. The modular type can be installed in many ways, which can better save operating costs.

The polyurethane screen is made of polyurethane and embedded in a steel frame. It has a specially designed fastening hook to clamp the mesh to the separator. Polyurethane screen has excellent performance in mining crushing and aggregate screening industry. Different sizes and types of mesh hole ensure high screening efficiency and smooth surfaces. Polyurethane materials make mesh noise much lower than braided vibrating mesh or perforated mesh.

Our polyurethane screens can effectively screen materials for many industrial applications, such as dehydration, mining, sand, stone, gravel, etc. Polyurethane is ideal for high wear areas in both wet and dry processing applications.

THe high-strength woven wire screen is made of best steel wire like manganese steel wire, galvanized steel wire and stainless steel wire. The mesh hole can be square, rectangular, or longslotted. With a variety of woven types, it can be suitable for different screens and materials.

The perforated screen is made of a metal plate with high compressive strength after punching. Compared with woven vibrating screen, porous vibrating screen has a smooth surface, which can ensure higher screening and separation efficiency.

5 vibrating screen common problems and how to solve? | m&c

5 vibrating screen common problems and how to solve? | m&c

There are many kinds of vibration screens, such as electromagnetic vibration screens, circular vibration screens, linear vibration screens, etc. The latter two belong to inertial vibration screens, which are commonly referred to as vibration screens. In daily production, vibration screen will encounter a variety of problems, such as poor screening quality, bearing overheating, abnormal sound, wrong technical indicators and so on.

Table of Contents 1. Poor screening quality1) Screen hole blockage2) serious wear of screen hole3) Non-uniform feeding of sieve4) too thick material on screen5) insufficient inclination of screen surface6) The motion direction of eccentric block is not in the same phase2. Bearing overheating1) too small radial clearance of bearing2) too tight top of bearing cover3) Bearing oil shortage or excessive, oil pollution or inconsistency3. Abnormal sound when the sieve is running1) Spring damage2) Bearing wear3) Bolt loosening of fixed bearings4) Untightened screen4. Technical indicators do not meet the requirements1) The sieve cannot start or its amplitude is too small.2) Insufficient rotational speed of sieve3) The Vibration Force of the Screen is Weak4) The amplitude of four points of the sieve is inconsistent5. Severe or damaged parts of sieve1) Pipe Beam Fracture2) Beam fracture3) Fracture of screen frame

There are many factors affecting the screening effect, including the nature of feeding, equipment factors, operation factors and so on. The reasons for poor screening quality include blocking of sieve hole, serious wear of sieve hole, uneven feeding of sieve, too thick material on sieve and insufficient inclination of sieve surface.

When the mud content and water content in the feed are high, the material will stick to the sieve hole and block the sieve hole. At this time, the sieve hole should be cleaned first, and then the spray amount and the inclination angle of the sieve surface should be adjusted appropriately.

When the screen is used for a long time, the wear of the screen hole will be serious and the screening effect will be seriously affected. At this time, the wear screen hole should be repaired. When the wear situation is very serious, the replacement of screen mesh should be considered.

When the feeding trough of the sieve is too narrow, the material can not be uniformly distributed along the whole sieve surface, which makes the sieve surface inefficient to use, and will affect the screening effect. At this time, the width of feeding trough should be adjusted to make the feeding of sieve uniform.

The excessive thickness of material on screen may be caused by the increase of feeding quantity, blocking of screen hole and small inclination angle of screen surface. At this time, it should be adjusted according to the specific situation.

For the circular vibrating screen, the most common reason for the poor screening effect is the inadequate inclination of the screen surface, so it is necessary to pad the back support. In practical application, the inclination angle of screen surface is more suitable when it is 20 degrees. The inclination angle of circular vibrating screen is generally 16-20 degrees. If the inclination angle is lower than 16 degrees, the phenomenon that the material on the screen is not moving smoothly or rolling upward will occur.

For linear vibrating screen and high frequency vibrating screen, the poor screening quality may be related to the movement direction of eccentric block, because two groups of eccentric blocks with the same mass need to rotate in self-synchronization and reverse direction to produce a single exciting force along the vibration direction at each instant, which has a fixed angle with the horizontal direction, so that the screen box can move in a reciprocating straight line. If not in the same phase, the direction of excitation force and direction of vibration will not overlap, and the effect of efficient screening will not be achieved.

Because the bearing on the vibrating screen bears a large load, a high frequency, and the load is always changing, the bearing must adopt a large clearance. If the bearing with ordinary clearance is used, the outer ring of the bearing must be grinded again to make it a large clearance.

There must be a clearance between the cover and the outer ring of the bearing to ensure the normal heat dissipation and certain axial movement of the bearing. The clearance can be adjusted by a gasket between the end cap and the bearing seat.

The technical indicators of the operation of the sieve include the rotational speed, vibration force, amplitude and frequency of the sieve, etc. Common fault types are: the screen can not start or the amplitude is too small, the speed is not enough, the vibration force is weak, the four-point amplitude is inconsistent, and so on.

When the vibration screen can not start or the amplitude is too small, the first consideration should be whether there is an electrical fault. Damage of motor and insufficient voltage can lead to faults. When there are no problems in the above aspects, we should start with the mechanical aspects. Whether the material on the screen surface is heavily accumulated or not, if so, it should be removed in time; whether the bolts on the coupling of the exciter fall off or not, whether the grease is caked; if so, the bolts should be tightened in time and the grease should be replaced.

Insufficient rotational speed may be the electrical reason. At this time, we should find out the reason and deal with it in time. It may also be that the transmission tape is too loose. At this time, we should tighten the transmission tape.

The inconsistency of four-point amplitude of sieve may be caused by the asynchronism of two exciters on the same axis or material segregation. At this time, adjustments should be made to make the two exciters work synchronously and eliminate material segregation in time.

(a) The thin wall of pipe girder may lead to fracture. At this time, the same type of thick wall pipe or the first type of pipe girder should be selected, but it should not be too large or too thick, because this will increase the vibration quality of the sieve and bring many problems;

B) There must be horizontal and vertical pressure strips at the joints of the sieve plates of dehydration and de-mediation screens. If there is no longitudinal pressure strip, water will leak from the gap between the sieve screens and wash down the pipe girders, which are easy to break at the scouring point.

D) If the fracture of the pipe beam is not serious, in order not to affect production, the pipe beam can be repaired to continue to use. When repairing, the weld should be along the longitudinal direction of the pipe beam, and no transverse weld must be allowed, otherwise the pipe beam is more likely to fracture from the transverse weld.

Cross beam fracture is mostly due to the long working time at critical frequency, a large number of high-strength bolts to tighten the side plate are relaxed, serious deformation of the spring makes a great difference between left and right, or it may be that the weight error of eccentric block is too large, causing structural damage and cross beam fracture. At this time, the damaged structural parts and beams should be replaced, bolts should be tightened, and the quality of eccentric blocks should be adjusted.

The sieve frame is liable to break because of tremor. The best way to solve this problem is to thicken the side plate or add additional plate to the local area of the side plate near the exciter to enhance the rigidity of the whole sieve frame.

Thanks for explaining that you should replace screen mesh if it has been used for a long time. This makes sense, because that way you can save money by getting more efficient results. Ill have to look for a wire mesh screen.

problems and solutions of vibrating screen in south africa - lzzg

problems and solutions of vibrating screen in south africa - lzzg

As one of the screening equipment in South Africa, the vibrating screen mainly relies on its vibration characteristics to complete the classification, dewatering, and desliming operations and is widely used in the screening operations of the concentrator. In production practice, due to the complex working environment of the vibrating screen, continuous work for a long time, and heavy load, the vibrating screen is inevitably damaged or even malfunctions. To ensure the screening operation of the concentrator, we need to carry out daily maintenance and repair of the vibrating screen and take emergency measures in the event of a failure. The following introduces some common problems and solutions when the vibrating screen is in operation.

The vibrating screens mainly include linear vibrating screens, high-frequency vibrating screens, and circular vibrating screens. Different types of equipment have different reasons for bad screening results. For circular vibrating screens, insufficient screen surface inclination is one of the main reasons for poor screening results. For linear vibrating screens and high-frequency vibrating screens, the poor screening effect may be related to the direction of movement of the eccentric block. If the two sets of eccentric blocks are not in the same phase, the direction of the exciting force cannot overlap with the direction of vibration, and the effect of efficient screening cannot be achieved.

To solve the problemit is necessary to raise the rear support seat. In practical applications, the inclination angle of the screen surface can be maintained at 20, and the inclination angle of the general circular vibrating screen is often set at 16~20. If the inclination angle is less than 16, it will cause problems such as rolling up of the material or bad material removal on the screen. If the screening effect of the linear vibrating screen and the high-frequency vibrating screen is not satisfactory, the operator needs to check whether the phases of the two sets of eccentric blocks are level, and adjust them in time.

In the working process, the screen frame of the vibrating screen is constantly shaking, which is easy to cause bending fatigue, and local deformation or even cracking of the screen frame, side plate. If the screen frame is broken, the reasons may be as follows.

2. The damping spring fails. After the spring is used for a long time, the spring will be permanently deformed due to the aging of the rubber or the long-term force, which will cause the spring to fail.

3. The eccentric wheel of the exciter is severely worn and the quality deviates. During operation, the vibration force is dispersed and reflected on the screen body of the vibrating screen, causing the amplitude of each part to be inconsistent, causing the vibrating screen connection part to vibrate or the connection part weld to crack.

Properly thickening the screen is the most effective way to solve the problem of the too-thin screen. Or add additional plates to the side plates near the exciter to enhance the rigidity of the entire screen body. In this way, the screen frame is not easy to tremble and break. In addition, it is necessary to regularly check the wear of the shock absorber spring and the eccentric wheel of the exciter to prevent spring failure and quality deviation.

3. Clay accumulation. The vibration amplitude of the mound is too small to effectively overcome the viscous force of the clay, which causes the clay to quickly accumulate on the screen and damage the screen.

The technical level and quality of the screening equipment in South Africa directly affect the production efficiency of the equipment and the economic benefits of the concentrator. Therefore, it is necessary to master some common vibrating screen problem diagnosis and solution methods in production practice.

vibratory screens | mclanahan

vibratory screens | mclanahan

Screens can be considered the cashbox of the operation, because while crushersmake the gradation, screens make the specification. Material must go through or over a specified size to end up in the right pile. Unlike the crushers, Vibratory Screens cannot produce material; they can only size material that is already reduced to the product sizes. Vibratory Screens allow crushers to achieve maximum performance by sizing the material feed to the crusher and efficiently removing the finishing product from the circuit as it is produced.

Vibratory Screens can be subdivided into Inclined and Horizontal style screens. Today's screens come in widths from 4-12' wide and from 8-32' long. Screens are normally sized so that the length is 2.5 times the width. The width of a screen will determine the maximum carrying capacity of the screen deck, while the length of the screen will determine the overall efficiency of the deck.

McLanahan Vibratory Screens are engineered with ASTM A572 Grade 50 steel side plates. With a tensile strength of 65,300psi (65ksi), these side plates have a 45% higher yield strength than A-36 steel, which can withstand up to 36,000 psi (36ksi) of stress before it begins to drastically deform. A fully bolted construction reduces/eliminates cracking due to stress risers in the steel caused by welding. Worn components can be quickly replaced without cutting.

McLanahan Vibratory Screens are built with an integrated feed box and are able to withstand heavier loading and larger material in the feed end without worrying about bolts loosening or structural failure.

McLanahan Vibratory Screens feature robust side plate stiffening. Formed plates are bolted to side plates to form a rigid support grid along the length of the side sheet. Independent cross members can be pulled individually and relined in a clean work bay versus on a screen tower, and reduce the need for heavy and wear prone X-bracing. Cross members are on 4' centers to allow more clearance for personnel to access the decks. Replacement cross members come shorter in length and with machined/matched shims to allow for easy installation in areas with limited clearance.

Structural tubing gives the producer a variety of size options and allows you to replace only the worn tubes, not the complete deck frame. A sacrificial weld plate installed on top of the tubes allows stringers and bucker bars to be welded in without welding directly to the tube.

The performance of a screen is affected by four variables: eccentric throw, frequency (rpm), angle of adjustment and throw direction. By manipulating these variables, the operator can dial in the screen to match the application and material.

Eccentric ThrowEccentric throw is the radius of the screen box. Generally, the greater the throw, the more aggressive the screen action will be. Consequently, the smaller the throw, the less aggressive the screening action. Keeping this in mind, the operator can set up the operation with a heavy throw for heavier or larger materials, or a smaller throw to create a sifting action more suited for finer separations.

FrequencyThe frequency of the screen is measured in the number of revolutions per minute the screen makes. In conjunction with the eccentric throw, a lower frequency allows for a more aggressive screen action for larger material and cuts, while a higher frequency is used for smaller material and cuts.

Angle of AdjustmentThe angle of the screen plays a large factor in its overall performance as well. A flatter screen angle will provide a longer retention time of material on the deck and more probability that a particle will fall through the opening. As the angle is increased, the retention time is decreased.

ThrowIt may be advantageous to run the throw of the screen uphill. The goal is to increase the retention time on the screen, as well as change the orientation of the particles to the screen opening. The reverse action does not hurt the screen and is usually used in finer screening application, but be cautious not to increase the bed depth too much.

Stratification and SeparationTwo main operations have to occur for material to be screened: stratification and separation. Stratification is the process of larger sized material rising to the top of the bed, while smaller particles go to the bottom of the bed. Separation is the process by which particles introduced to the screen opening either fall through the opening or do not. Stratification must occur before separation can take place.

The separation probability is a function of the ratio between the size of the screen opening and the size of the particle. If the ratio is large in other words, the particle is much smaller than the opening there is a high probability the particle will fall through. If the ratio is small the particle is close in size to the opening then the probability is low that it will fall through.

Motion on a Vibratory Screen is produced with a combination of amplitude (stroke) and frequency (speed). The goal is to allow the particle to see as many openings as possible as it travels down the screen, but never see the same opening twice. Large screen openings for large cuts can be achieved with high amplitude and low speed. For small screen openings for finer cuts, the opposite is true: low amplitude and high speed.

Many producers have experienced a variety of problems that point to a screen deck that was improperly selected. It's wearing too fast. Its plugging (material getting stuck in the screen opening) or blinding (screen opening clogged by sticky material). The noise level is too high.

Many factors affect the overall efficiency of the screening process. Selecting the proper media for the application will be a big factor toward success. Wire cloth is the most widely used screen surface. Technological advances make it easier to consider other types of screen media.

The type of media chosen will depend on material abrasiveness, impact, material size, moisture content, cost-effectiveness and noise level. Wire cloth may be the lowest initial cost media, but the most cost-effective for anoperation will be the one that meets the specific application.

Rubber screens are a good choice for scalping decks in a dry, high-impact application. Rubber is very durable and can withstand the impact of the larger feed material hitting the deck. In a dry secondary application, a rubber screen can provide a long life, even in abrasive feed material.

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