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speed of rotation of jaw crusher in kenya

solutions to improve the production capacity of jaw crusher

solutions to improve the production capacity of jaw crusher

Production capacity is the quantitative index to measure the processing ability of jaw crusher. The production capacity of jaw crusher directly affects the economic profits of investors. And the production capacity of jaw crusher is affected by many factors, such as the properties of raw material (hardness, size, and bulk density), type& size of jaw crusher, operation condition of jaw crusher and so on. And the low production capacity is mainly caused by the low discharging capacity. In this article, we mainly introduce some solutions to improve jaw crusher production capacity.

The nip angle means the included angle between movable jaw plate and fixed jaw plate. According to calculation, the max nip angle can reach to 32, but in the actual production, the nip angle is generally between 18-20, smaller than 25. If the nip angle is too large, the raw materials in crushing cavity will be squeezed out of the cavity, which may hurt operators or damage other auxiliary equipment. At the same time, with the increasing of nip angle, the crushing ratio also increases, but the production rate will decrease.

In the actual production process, we can change the size of nip angle by adjusting the discharge opening according to requirements about the final products size. In this case, under the premise of ensuring the final products size, we should adjust the discharge opening. While adjusting the discharge opening, operators should pay attention to the relation between crushing ratio and production rate.

In certain range, properly increase the revolutions of eccentric shaft can also improve the production capacity of jaw crusher, but it will also increase the energy consumption for crushing per unit raw material. If the rotation speed is too fast, the crushed raw materials in crushing cavity will not have enough time to be discharged, which will cause the blocking of jaw crusher. In this case, the production capacity will decrease, but energy consumption will increase. From this we can see that, proper revolution of eccentric shaft is very important.

Through dynamics and physics principle analysis, in order to improve the production capacity, we can change the shape of movable jaw plate, making the nip angle in the lower part as 0 while the nip angle of the upper part stays the same. In this case, the original crushing cavity is divided into two parts: crushing cavity and discharging cavity. The raw materials get crushed in the crushing cavity and discharged from the discharging cavity. Raw materials pass through in unit time increase, the production capacity also gets improved.

In jaw crusher, eccentric shaft, connecting rod, movable jaw plate, fixed jaw plate, scale board are the main wear-resistant parts, operators should pay attention to the lubrication and maintenance of these parts. Once found damage, operators should repair or change the worn parts timely in order to keep the high production capacity of jaw crusher.

By optimizing the shape of movable jaw plate or discharge opening, we can optimize the crushing cavity, enhance improve the discharge capacity and production capacity. At the same time, operators should also lubricate or maintain the related spare parts and optimize the related parameters in order to improve the production capacity.

In order to solve such problems as low production efficiency and difficult installation and maintenance, ZENITH developed a new generation of jaw crusher--- C6X Series Jaw Crusher. It is the most ideal coarse crushing equipment on current market because a

As the new generation of crusher, PEW Series Jaw Crusher is born with innovative significance. The unique design concept makes this crusher achieve perfect combination between crushing efficiency and operating cost.

jaw crusher working principle

jaw crusher working principle

A sectional view of the single-toggle type of jaw crusher is shown below.In one respect, the working principle and application of this machine are similar to all types of rock crushers, the movable jaw has its maximum movement at the top of the crushing chamber, and minimum movement at the discharge point. The motion is, however, a more complex one than the Dodge motion, being the resultant of the circular motion of the eccentric shaft at the top of the swing jaw. combined with the rocking action of the inclined toggle plate at the bottom of this jaw. The motion at the receiving opening is elliptical; at the discharge opening, it is a thin crescent, whose chord is inclined upwardly toward the stationary jaw. Thus, at all points in the crushing chamber, the motion has both, vertical and horizontal, components.

It will be noted that the motion is a rocking one. When the swing jaw is rising, it is opening, at the top, during the first half of the stroke, and closing during the second half, whereas the bottom of the jaw is closing during the entire up-stroke. A reversal of this motion occurs during the downstroke of the eccentric.

The horizontal component of motion (throw) at the discharge point of the single-toggle jaw crusher is greater than the throw of the Dodge crusher at that point; in fact, it is about three-fourths that of Blake machines of similar short-side receiving-opening dimensions. The combination of favorable crushing angle, and nonchoking jaw plates, used in this machine, promotes a much freer action through the choke zone than that in the Dodge crusher. Capacities compare very favorably with comparable sizes of the Blake machine with non-choking plates, and permissible discharge settings are finer. A table of ratings is given.

The single-toggle type jaw crusher has been developed extensively. Because of its simplicity, lightweight, moderate cost, and good capacity, it has found quite a wide field of application in portable crushing rigs. It also fits into the small, single-stage mining operation much better than the slower Dodge type. Some years since this type was developed with very wide openings for reduction crushing applications, but it was not able to seriously challenge the gyratory in this field, especially when the high-speed modern versions of the latter type were introduced.

Due to the pronounced vertical components of motion in the single-toggle machine, it is obvious that a wiping action takes place during the closing strokes; either, the swing jaw must slip on the material, or the material must slip along the stationary jaw. It is inevitable that such action should result in accelerated wear of the jaw plates; consequently, the single-toggle crusher is not an economical machine for reducing highly abrasive, or very hard, tough rock. Moreover, the large motion at the receiving opening greatly accentuates shocks incidental to handling the latter class of material, and the full impact of these shocks must be absorbed by the bearings in the top of the swing jaw.

The single-toggle machine, like the Dodge type, is capable of making a high ratio-of-reduction, a faculty which enables it to perform a single-stage reduction of hand-loaded, mine run ore to a suitable ball mill, or rod mill, feed.

Within the limits of its capacity, and size of receiving openings, it is admirably suited for such operations. Small gravel plant operations are also suited to this type of crusher, although it should not be used where the gravel deposit contains extremely hard boulders. The crusher is easy to adjust, and, in common with most machines of the jaw type, is a simple crusher to maintain.

As rock particles are compressed between the inclined faces of the mantle and concaves there is a tendency for them to slip upward. Slippage occurs in all crushers, even in ideal conditions. Only the particles weight and the friction between it and the crusher surfaces counteract this tendency. In particular, very hard rock tends to slip upward rather than break. Choke feeding this kind of material can overload the motor, leaving no option but to regulate the feed. Smaller particles, which weigh less, and harder particles, which are more resistant to breakage, will tend to slip more. Anything that reduces friction, such as spray water or feed moisture, will promote slippage.

Leading is a technique for measuring the gap between fixed and moveable jaws. The procedure is performed while the crusher is running empty. A lead plug is lowered on a lanyard to the choke point, then removed and measured to find out how much thickness remains after the crusher has compressed it. This measures the closed side setting. The open side setting is equal to this measurement plus the throw of the mantle. The minimum safe closed side setting depends on:

Blake (Double Toggle) Originally the standard jaw crusher used for primary and secondary crushing of hard, tough abrasive rocks. Also for sticky feeds. Relatively coarse slabby product, with minimum fines.

Overhead Pivot (Double Toggle) Similar applications to Blake. Overhead pivot; reduces rubbing on crusher faces, reduces choking, allows higher speeds and therefore higher capacities. Energy efficiency higher because jaw and charge not lifted during cycle.

Overhead Eccentric (Single Toggle) Originally restricted to sampler sizes by structural limitations. Now in the same size of Blake which it has tended to supersede, because overhead eccentric encourages feed and discharge, allowing higher speeds and capacity, but with higher wear and more attrition breakage and slightly lower energy efficiency. In addition as compared to an equivalent double toggle, they are cheaper and take up less floor space.

Since the jaw crusher was pioneered by Eli Whitney Blake in the 2nd quarter of the 1800s, many have twisted the Patent and come up with other types of jaw crushers in hopes of crushing rocks and stones more effectively. Those other types of jaw crusher inventors having given birth to 3 groups:

Heavy-duty crushing applications of hard-to-break, high Work Index rocks do prefer double-toggle jaw crushers as they are heavier in fabrication. A double-toggle jaw crusher outweighs the single-toggle by a factor of 2X and well as costs more in capital for the same duty. To perform its trade-off evaluation, the engineering and design firm will analyze technical factors such as:

1. Proper selection of the jaws. 2. Proper feed gradation. 3. Controlled feed rate. 4. Sufficient feeder capacity and width. 5. Adequate crusher discharge area. 6. Discharge conveyor sized to convey maximum crusher capacity.

Although the image below is of a single-toggle, it illustrates the shims used to make minor setting changes are made to the crusher by adding or removing them in the small space between the crushers mainframe and the rea toggle block.

The jaw crusher discharge opening is the distance from the valley between corrugations on one jaw to the top of the mating corrugation on the other jaw. The crusher discharge opening governs the size of finished material produced by the crusher.

Crusher must be adjusted when empty and stopped. Never close crusher discharge opening to less than minimum opening. Closing crusher opening to less than recommended will reduce the capacity of crusher and cause premature failure of shaft and bearing assembly.

To compensate for wear on toggle plate, toggle seat, pitman toggle seat, and jaws additional shims must be inserted to maintain the same crusher opening. The setting adjustment system is designed to compensate for jaw plate wear and to change the CSS (closed side setting) of the jaw crusher. The setting adjustment system is built into the back frame end.

Here also the toggle is kept in place by a compression spring. Large CSS adjustments are made to the jaw crusher by modifying the length of the toggle. Again, shims allow for minor gap adjustments as they are inserted between the mainframe and the toggle block.

is done considering the maximum rock-lump or large stone expected to be crushed and also includes the TPH tonnage rate needing to be crushed. In sizing, we not that jaw crushers will only have around 75% availability and extra sizing should permit this downtime.

As a rule, the maximum stone-lump dimension need not exceed 80% of the jaw crushers gape. For intense, a 59 x 79 machine should not see rocks larger than 80 x 59/100 = 47 or 1.2 meters across. Miners being miners, it is a certainty during day-to-day operation, the crusher will see oversized ore but is should be fine and pass-thru if no bridging takes place.

It will be seen that the pitman (226) is suspended from an eccentric on the flywheel shaft and consequently moves up and down as the latter revolves, forcing the toggle plates outwards at each revolution. The seating (234) of the rear toggle plate (239) is fixed to the crusher frame; the bottom of the swing jaw (214) is therefore pushed forward each time the pitman rises, a tension rod (245) fitted with a spring (247) being used to bring it back as the pitman falls. Thus at each revolution of the flywheel the movable jaw crushes any lump of ore once against the stationary jaw (212) allowing it to fall as it swings back on the return half-stroke until eventually the pieces have been broken small enough to drop out. It follows that the size to which the ore is crushed.

The jaw crusher is not so efficient a machine as the gyratory crusher described in the next paragraph, the chief reason for this being that its crushing action is confined to the forward stroke of the jaw only, whereas the gyratory crusher does useful work during the whole of its revolution. In addition, the jaw crusher cannot be choke-fed, as can the other machine, with the result that it is difficult to keep it working at its full capacity that is, at maximum efficiency.

Tables 5 and 6 give particulars of different sizes of jaw crushers. The capacity figures are based on ore weighing 100 lb. per cubic foot; for a heavier ore, the figures should be increased in direct proportion to its weight in pounds per cubic foot.

The JAW crusher and the GYRATORY crusher have similarities that put them into the same class of crusher. They both have the same crushing speed, 100 to 200 R.P.M. They both break the ore by compression force. And lastly, they both are able to crush the same size of ore.

In spite of their similarities, each crusher design has its own limitations and advantages that differ from the other one. A Gyratory crusher can be fed from two sides and is able to handle ore that tends to slab. Its design allows a higher-speed motor with a higher reduction ratio between the motor and the crushing surface. This means a dollar saving in energy costs.

A Jaw crusher on the other hand requires an Ely wheel to store energy. The box frame construction of this type of crusher also allows it to handle tougher ore. This design restricts the feeding of the crusher to one side only.

The ore enters from the top and the swing jaw squeezes it against the stationary jaw until it breaks. The broken ore then falls through the crusher to be taken away by a conveyor that is under the crusher.Although the jaws do the work, the real heart of this crusher is the TOGGLE PLATES, the PITMAN, and the PLY WHEEL.

These jaw crushers are ideal forsmall properties and they are of the high capacity forced feed design.On this first Forced Feed Jaw Crusher, the mainframe and bumper are cast of special alloy iron and the initial cost is low. The frame is ribbed both vertically and horizontally to give maximum strength with minimum weight. The bumper is ruggedly constructed to withstand tremendous shock loads. Steel bumper can be furnished if desired. The side bearings are bronze; the bumper bearings are of the antifriction type.

This bearing arrangement adds both strength and ease of movement. The jaw plates and cheek plates are reversible and are of the best-grade manganese steel. The jaw opening is controlled by the position of an adjustable wedge block. The crusher is usually driven by a V-to-V belt drive, but it can be arranged for either V-to-flat or fiat belt drive. The 8x10 size utilizes a split frame and maybe packed for muleback transportation. Cast steel frames can be furnished to obtain maximum durability.

This second type of forced feed rock crusher is similar in design to the Type H listed above except for having a frame and bumper made of cast steel. This steel construction makes the unit lighter per unit of size and adds considerable strength. The bearings are all of the special design; they are bronze and will stand continuous service without any danger of failure. The jaw and cheek plates are manganese steel; and are completely reversible, thus adding to their wearing life. The jaw opening is controlled by the position of an adjustable wedge block. The crushers are usually driven by V-to-V but can be arranged for V-to-flat and belt drive. The 5x6 size and the 8x10 size can be made with sectionalized frame for muleback transportation. This crusher is ideal for strenuous conditions. Consider a multi jaw crusher.

Some jaw crushers are on-floor, some aboveground, and others underground. This in many countries, and crushing many kinds of ore. The Traylor Bulldog Jaw crusher has enjoyed world wide esteem as a hard-working, profit-producing, full-proof, and trouble-free breaker since the day of its introduction, nearly twenty years ago. To be modern and get the most out of your crushing dollars, youll need the Building breaker. Wed value the privilege of telling you why by letter, through our bulletins, or in person. Write us now today -for a Blake crusher with curved jaw plates that crush finer and step up production.

When a machine has such a reputation for excellence that buyers have confidence in its ability to justify its purchase, IT MUST BE GOOD! Take the Type G Traylor Jaw Crusher, for instance. The engineers and operators of many great mining companies know from satisfying experience that this machine delivers a full measure of service and yields extra profits. So they specify it in full confidence and the purchase is made without the usual reluctance to lay out good money for a new machine.

The success of the Type G Traylor Jaw Crusheris due to several characteristics. It is (1) STRONG almost to superfluity, being built of steel throughout; it is (2) FOOL-PROOF, being provided with our patented Safety Device which prevents breakage due to tramp iron or other causes of jamming; it is (3) ECONOMICAL to operate and maintain, being fitted with our well-known patented Bulldog Pitman and Toggle System, which saves power and wear by minimizing frictionpower that is employed to deliver increased production; it is (4) CONVENIENT to transport and erect in crowded or not easily accessible locations because it is sectionalized to meet highly restrictive conditions.

Whenever mining men need a crusher that is thoroughly reliable and big producer (which is of all time) they almost invariably think first of a Traylor Type G Jaw Crusher. By experience, they know that this machine has built into it the four essentials to satisfaction and profit- strength, foolproofness, economy, and convenience.

Maximum STRENGTH lies in the liberal design and the steel of which crushers parts are made-cast steel frame, Swing Jaw, Pitman Cap and Toggles, steel Shafts and Pitman rods and manganese steel Jaw Plates and Cheek Plates. FOOLPROOFNESS is provided by our patented and time-tested safety Device which prevents breakage due to packing or tramp iron. ECONOMY is assured by our well-known Bulldog Pitman and Toggle System, which saves power and wear by minimizing friction, the power that is used to deliver greater productivity. CONVENIENCE in transportation and erection in crowded or not easily accessible locations is planned for in advance by sectionalisation to meet any restrictive conditions.

Many of the worlds greatest mining companies have standardized upon the Traylor Type G Jaw Crusher. Most of them have reordered, some of them several times. What this crusher is doing for them in the way of earning extra dollars through increased production and lowered costs, it will do for you! Investigate it closely. The more closely you do, the better youll like it.

parameters in impact crusher that affect its function

parameters in impact crusher that affect its function

Impact crusher has high crushing ratio and efficiency, so it is widely used in metallurgy, construction, chemical and some other industries. There are various parameters in impact crusher and these parameters are related with each other and affect the function of impact crusher together. In this case, knowing these parameters and making them have full play means a lot in improving the production rate and products quality of impact crusher. Here, we mainly introduce parameters in impact crusher that affects its function.

Generally, the diameter and length of rotor is related with the feeding size of raw material. While crushing the raw materials, we need enough impact force. In other words, the diameter and length of rotor should be proper. If the diameter of rotor is too small, we cannot get enough impact force to crush the raw materials. If the diameter of rotor is too small, the energy consumption will increase, which is no good to energy-saving. Generally, we adopt a formula to decide the diameter of rotor: D= (2-4) d

The more the number of blow bar, the better of the crushing efficiency. But too many blow bars will cause the production process very complicated and consumes much raw material. Normally, the number of blow bar is decided by the diameter of rotor. When the diameter or rotor is small, the number of blow bar is relatively less. Generally, when the diameter of rotor is below 1m, we can equip three blow bars; when the diameter of rotor is about 1-1.5m, we can equip 4-6 blow bars and when the diameter of rotor is about 1.5-2m, we can equip 6-10 blow bars.

The raw materials enter the crushing cavity of impact crusher through the feeding guide plate, so the dip angle of feeding guide plate is a very important parameter affect impact crusher function. The smaller of the dip angle, the slower of the speed that raw materials glide. In this case, the raw materials can get fully crushed, and we can get high quality final products. But if the dip angle is too small, the production rate will decrease or even cause the raw materials piling up in the feed opening. The larger of the dip angle, the gliding speed of raw materials gets faster. In this case, the crushing efficiency will increase, but the raw materials cannot get fully crushed, affecting the quality of final products. Besides, if the dip angle increases, the height of impact crusher also will increase. Generally, the dip angle is between 45-60, if other factors meet requirements, we adopt the minimum dip angle.

The rotation speed of rotor is one of the important parameters in impact crusher. It plays decisive role in the production capacity, final products size and crushing ratio. Test shows that with the increasing of rotation speed of rotor, the production capacity and crushing ratio of impact crusher both greatly increase. But the power consumption will also increase along with the increasing of rotation speed of rotor. Besides, in this process, the damage of blow bar also accelerates and the requirement about manufacturing accuracy also increases.

The production rate of impact crusher is related with the rotation speed of rotor and the geometric parameter. When the raw materials are impacted by blow bar and get through the gap between rotor and impact plate, the width of raw material zone is equal to the length of rotor.

on oscillations of a vibratory jaw crusher with asymmetric interaction of the jaws with the processed medium | jve journals

on oscillations of a vibratory jaw crusher with asymmetric interaction of the jaws with the processed medium | jve journals

Vibroengineering PROCEDIA, Vol. 25, 2019, p. 83-88. https://doi.org/10.21595/vp.2019.20831 Received 26 May 2019; accepted 5 June 2019; published 25 June 2019

Panovko Grigory, Shokhin Alexander, Lyan Ilya On oscillations of a vibratory jaw crusher with asymmetric interaction of the jaws with the processed medium. Vibroengineering PROCEDIA, Vol. 25, 2019, p. 83-88. https://doi.org/10.21595/vp.2019.20831

This paper is devoted to the problem of providing the required synchronous modes of oscillations of a jaw crusher with self-synchronizing inertial vibration exciters. The described mathematical model of the crusher takes into account the mechanical properties of the medium being processed and the possible asymmetry of its contact with the crushers working bodies the jaws. A numerical analysis of synchronous modes of crusher vibrations with different asymmetries of the initial location of the processed medium relative to the jaws is done. It is shown that for given oscillation excitation frequencies, the non-simultaneous contact of the processed medium with the jaws can lead to a change in the types of synchronous vibrations of the jaw crusher.

One of the problems of creating efficient vibratory jaw crushers with two movable jaws, which oscillations are excited by self-synchronizing inertial vibration exciters, is the provision of synchronous jaws antiphase oscillations [1-3]. The type of synchronization of the exciters rotation and the jaws oscillation forms have a mutual influence on each other and are determined by the mechanical parameters of the system, the processed mediums characteristics, the electric drives parameters of vibration exciters and their rotation frequency [3, 4]. When studying the dynamics of such crushers, it is especially difficult to take into account the interaction of the jaws with the medium being processed [2, 5, 6]. In mathematical models used in common computational practice, this interaction is usually taken into account in the form of viscous friction forces [5, 7, 8]. At the same time, factors excluded from consideration, such as non-simultaneous contact of the jaws with the processed medium, its elastic properties, as well as the vibro-impact nature of its interaction with the crushers jaws, can have a significant influence on the systems dynamics.

This paper is devoted to identifying the effect of non-simultaneous interaction of jaws with the processed medium, taking into account their impact contact, on the exciters self-synchronization and jaws movement.

The solution of the problem is based on the analysis of the vibrating jaw crushers dynamics with two movable jaws that perform straight horizontal oscillations excited by two inertial vibration exciters installed on each of the jaws. The design scheme of such a crusher is shown in Fig. 1. The crushers body is modeled by a solid body of mass m1, elastically attached to a fixed base. The jaws are modeled by identical solids with mass m2. The jaws are attached to the crushers body with the identical elastic elements. It is assumed that all elastic elements have linear stiffness and damping characteristics with coefficients c0, c1 and b0, b1, respectively. On each of the jaws the same unbalance vibration exciter is fixed, driven by an asynchronous motor of limited power whereas me and r each vibration exciters imbalanced mass and eccentricity, J adduced moment of inertia of the vibration exciters asynchronous motor, Lj torque of the jth vibration exciters electric motor (j= 1, 2) described by the static characteristic [9]. The friction in the bearings of the unbalance shafts is taken into account in the form of the moments Rj of dry frictions forces (not shown in Fig. 1).

Between the jaws there is a processed medium modeled by a solid body m3 with two (one on the left and one on the right) identical elastic elements, with stiffness and viscosity coefficients c2 and b2, respectively, providing one-way interaction with each of the jaws. In addition, the body m3 is attached to a fixed base by a linear elastic element with stiffness and viscosity coefficients c3 and b3, respectively, which ensures that the modeled medium returns to its initial position only when there is no contact with the jaws. In this way, the inflow of a new unprocessed part of the medium through the crushers fixed loading window into the working space between the jaws is simulated. In the initial state, the working bodies can be installed with a gap (pre-tension) relative to the contact elements, which is given by the values 1 and 2.

Displacements of the bodies are described by coordinates xi (i= 1, 2, 3, 4) of their centers of mass, measured from their equilibrium position. The positions of the debalances are described by the angles of rotation j (j= 1, 2), measured from the negative direction of the axis Ox.

n = m n / m 2 ( n = 1,3 ) , e=me/m2, 0=c0/c1, 2=c2/c1, 3=c3/c1, 2=b2T*/m2, 0=b0/b1, 2=b2/b1, 3=b3/b1, yi=xi/X* dimensionless coordinates, X*=r0, r0 given eccentricity initial value, T*=m2/c1 time scale:

where Mc and sc critical torque and slip of the asynchronous motor, j=1 denotes direction of the motors rotation, sj=(j0-j)/j0, 0=e/p synchronous speed of rotation of the electric motor, e frequency of the supply voltage, p number of pole-pairs of the electric motor, R~j=fj2sign(j), f coefficient of dry friction, dots indicate differentiation by dimensionless time =t/T*. The presented equations system allows to analyze the crushers motion, taking into account the non-simultaneous impact of the jaws on the processed medium and their impact contact.

The system oscillations were simulated numerically in Matlab using standard functions for integrating differential equations with the condition to accurately determine the time of the beginning and the end of the jaws contact with the processed medium.

At the first stage, the frequency ranges of synchronous exciters rotation and jaws motion were determined in the absence of the processed medium (the standard task of studying the frequency ranges of the exciters synchronous rotation and the crushers vibration modes with the aim of selecting its operating modes). For this, the frequency of the supply voltage e was set, which discretely increased in the range of 0.1 e 2.5 with a step e= 0.5 and an exposure at each step during = 400 sufficient to achieve steady-state oscillations of the system (the law of change e is shown in Fig. 2). In this case, in the considered frequency range e, the maximum torque of the engine was considered to be a constant value. The calculations were carried out with the following system parameters: 1= 2, 3= 0.05, = 0.03, 01= 0.1, 14=1, 30= 0.5, 0= 1, 2= 10, 3= 1, Mc= 100, sc= 0.2, f= 0.001, d= 0.61, L*=0.005, 1=-1, 2=1.

In Fig. 3 and Fig. 4 the results of calculating the rotational velocity of the inertial exciters j and the mutual phase shift of the rotation between the exciters as a function of time are shown, respectively. The value of = 180 corresponds to the synchronous antiphase rotation of the exciters debalances, which causes the antiphase oscillations of its jaws required for the crushers normal operation. When = 0, the debalances rotate in phase, exciting the common-mode oscillations of the crushers jaws. One can see from Fig. 2 and Fig. 4 that the required synchronous modes of the debalances rotation and, accordingly, oscillations of the crusher are realized in the ranges of supply voltage frequencies e[0.8, 1.2] and e[1.85,2.5]. Fig. 2 and Fig. 3 show the relationship between the power supply frequency and the rotational velocities of the debalances. It also can be seen that in the indicated ranges of the supply voltage frequency, the debalances rotate with the same angular velocity in absolute value. When approaching the second and third resonant frequencies (2*= 0.976, 3*= 1.445), the rate of change of an average rotational velocity of the debalances decreases at the same rate of change in the power supply frequency (Fig. 3). The passage through the resonance is accompanied by a jump in the rotational velocity of the debalances, as well as a change in the type of their synchronous rotation and the jaws oscillation form. These effects are associated with a slip in asynchronous motors and the interaction of the oscillating system with vibration exciters.

To analyze the possible influence of non-simultaneous contact of the jaws with the processed medium on the exciters synchronization and the jaws vibrations, the crushers oscillations were simulated with a gradual change in the initial gap ~1 between the left jaw and the corresponding contact element of the processed medium for a given value of power supply frequency. The gap varied in the range of 0.1 ~1 0.4 with a step ~1= 0.1 and an exposure at each step for =400 (the law of change of the gap ~1 is shown in Fig. 5). At the same time, the initial gap between the right jaw and the right contact element of the medium did not change and, to ensure the initial contact symmetry, it was assumed to be ~2= 0.1. The study was carried out for different frequencies of the supply voltage in the range of e[1.85, 2.5], in which a exciters synchronous antiphase rotation occurs (after the third resonance). The frequency range e[0.8,1.2] between the first and second resonances was not considered, because at these frequencies the developed forces are usually not sufficient to destroy the material, and therefore it is not used in common practice.

In Fig. 6-9 graphs of the change in the mutual phase shift of between the debalances obtained at supply voltage frequencies e={1.85, 2.0, 2.2, 2.4} are presented. It can be seen that at frequencies e={1.85, 2.0} (see Fig. 6 and Fig. 7), the exciters synchronization is broken when the gap ~1= 0.4 is reached. In this case, the mutual phase shift between the debalances does not stabilize with time. In turn, this leads to a violation of the required oscillation synchronous antiphase mode of the crushers jaws. When e= 2.2 (see Fig. 8), a synchronization violation occurs when ~1= 0.3. When e= 2.4 (see Fig. 9), synchronization is violated when ~1= 0, while the mode of antiphase oscillations of the crushers jaws is maintained up to ~1=0.2 (i.e., up to = 1200). Thus, with an increase in the excitation frequency, a decrease in the contact asymmetry of the processed medium with the crushers jaws is observed, at which a violation of the required exciters synchronization and, accordingly, oscillations of the jaws occurs.

The simulation results presented in this paper clearly demonstrate the possibility of violation of the debalances synchronous rotation and, accordingly, oscillations of the crushers jaws when the contact interaction conditions with the processed medium are changed due to jaws non-simultaneous contact with the processed medium. It is shown that with an increase in the excitation frequency, a decrease in the contact asymmetry of the processed medium with the crushers jaws is observed, at which a violation of the required synchronous rotation of the unbalances and, accordingly, oscillations of the jaws occur. Such changes in the contact interaction conditions can occur directly during the crushers operation, and they must be taken into account when assigning its operating modes.

self-synchronization of a vibrating jaw crusher with allowance for interaction with the medium processed | springerlink

self-synchronization of a vibrating jaw crusher with allowance for interaction with the medium processed | springerlink

The vibrations of a vibrating jaw crusher model, excited by two self-synchronizing unbalanced-mass vibration exciters, with allowance for the interaction with the processed medium are examined. It is found that the frequency range of stable antiphase synchronization of the exciter rotation required for normal operation of the crusher, depends significantly on the gap between the crusher jaw and the medium element, and a decrease in the initial gap leads to an expansion of the frequency range of exciter stable antiphase synchronization. In the absence of an initial gap and the appearance of medium pressure on the jaws in the superresonance range, the appearance of a stability region of the synchronous-in-phase exciters rotation is possible. It is shown that, at a constant vibration excitation frequency, a change in the initial gap between the jaws and the processed medium can lead to a change in the type of exciter synchronization and, accordingly, vibrations of the jaws.

Vaisberg, L.A., Zarogatskii, L.P., and Turkin, V.Ya., Vibratsionnye drobilki. Osnovy rascheta, proektirovaniya i tekhnologicheskogo primeneniya (Vibrating Crushers. Basics of Calculation, Design, and Technological Application), St. Petersburg: VSEGEI, 2004.

Tyagushev, S.Yu., Turkin, V.Ya., and Shonin, O.B., Stabilization of the synchronous-antiphase mode of a vibrating jaw crusher by means of an automated electric drive, Obogashch. Rud, 2011, no. 2, p. 38.

Arkhipov, M.N., Vetyukov, M.M., Nagaev, R.F., and Utimishev, M.M., Dynamics of a vibratory jaw crusher taking into account the effect of destructible material, Probl. Mashinostr. Nadezhnosti Mash., 2006, no. 1, p. 21.

Shokhin, A.E. Self-Synchronization of a Vibrating Jaw Crusher with Allowance for Interaction with the Medium Processed. J. Mach. Manuf. Reliab. 49, 500510 (2020). https://doi.org/10.3103/S10526

rotation speed of rotor can influence the crushing effect of impact crusher | china crusher | mesto, sandvik, liming

rotation speed of rotor can influence the crushing effect of impact crusher | china crusher | mesto, sandvik, liming

Impact crusher is a kind of new and high efficiency crushing equipment, which combined with the crushing method of shearing, striking, grinding, impacting and centrifugal impaction to effectively and fully utilize the power and crushing cavity, so it has the important position among the crushers.

During working process, the crushing efficiency of impact crusher will be reduced by various factors. Such as rotation speed and rotational inertia of rotor, and the angle of impacting plate. Following, We will analyze the influence of these factors on the crushing effect of impact crusher.

Manufactures mobile crushers, mobile jaw crushers, Cone Crushers, Sand Maker China that are widely used in mining, construction, highway, bridge, coal, chemical, metallurgy, refractory matter, etc. [emailprotected]

jaw crusher - mines n minerals

jaw crusher - mines n minerals

A jaw crusher is generally used as a primary crusher in a crushing circuit. Product is fed into the top of the jaw crusher by an vibrating grizzly feeder. The eccentric rotating drive shaft causes the movable jaw to oscillate crushing the aggregate against a fixed jaw. Jaw crushers are run on belt drives driven by an electric motor or diesel engine. Jaw crushers are used extensively throughout the aggregate and mineral processing industry.

In this type of crusher, reduction takes place between a stationary jaw plate and a moving jaw plate. The moving jaw plate is mounted on the pitman, which is given a reciprocating motion. Crushing takes place when the pitman moves toward the stationary jaw, compressing the material.

Double toggle jaw crushers In the double toggle jaw crushers, the oscillating motion of the swing jaw is caused by the vertical motion of the pitman. The pitman moves up and down. The swing jaw closes, i.e., it moves towards the fixed jaw when the pitman moves upward and opens during the downward motion of the pitman. This type is commonly used in mines due to its ability to crush tough and abrasive materials.

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