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double toggle crushers

difference between single & double toggle jaw crusher

difference between single & double toggle jaw crusher

A double toggle jaw crusher is much larger, heavier, more moving parts and lower throughput than modern single toggle jaw crushers. The lower throughput statement is a bit misleading because its partially attributed to the type of bearings they have versus modern crushers, so if one was to upgrade the bearings, throughput could be closer to that of a modern jaw.

Anyway, double toggle jaw crushes are really more about where the eccentric is located than anything. In a double toggle jaw crusher, the eccentric is located behind the swinging jaw. This has two main effects, it keeps the eccentric out of harms way because there is no shock loading from the rock being crushed being transferred to the eccentric shaft and bearings. The other effect is a limited plane of motion for the swinging jaw which contributes to its lack of productivity. The jaw moves like a swinging door that is hinged at the top and is being pushed open and pulled closed at the bottom. One toggle plate goes from the bottom of the eccentric arm to the bottom of the swinging jaw, the other toggle plate goes from the opposite side of the bottom of the eccentric arm to a fixed point at the very back of the jaw crusher frame.

In contrast, the single toggle jaw crusher has fewer shafts and bearings and only one toggle which goes from the bottom of the swinging jaw to a fixed point at the back of the jaw crusher. The eccentric is located at the top of the swinging jaw and is part of the shaft. The advantage of this is that the jaw has two motions that are happening at the same time. It has the same swinging door motion that the double toggle has, but also has the up and down motion from the eccentric.

The advent of curved jaw crusher wearing plates made an approach other than segmental layout analysis desirable for prediction of capacities. For some time it had been known that the drawing board capacities of crushers using these plates had to be considerably modified by complicated experience factors to achieve agreement with results. Because these apparent capacities could be readily increased severalfold by minor crushing chamber shape changes, it was necessary that the utmost precaution be taken in predicting capacities of jaw plates modified for nonchoking, special wear characteristics, or any other reason.

While this paper is concerned principally with standard type single-toggle crusher capacities, the evaluation of data obtained with these machines is simplified by comparative reduction to the 10 x 7 in. Blake-type equivalents upon which the summary of the preceding paper was made. Convertibility of data from one type of crusher to the other also tends towards confirmation of both. The agreement of these data is sufficient to be considered complimentary. Consequently the feed factors, f, previously reported for Blake crushers are slightly adjusted to an average with the single-toggle crusher results.

d is the apparent density of the broken product in pounds per cubic foot. (If the true specific gravity of the feed is known, 40 pct voids may be assumed and d becomes 37.4 times sp gr). w is the width of crushing chamber in inches. y is the open side setting of the crusher, in inches. In the case of corrugated jaw plates it is measured from the tip of one corrugation to the bottom of the valley opposite. t is the length of jaw stroke in inches at the bottom of the crushing chamber. It is the difference between open and close-side settings. n is rpm, or crushing cycles per minute. a is the nip-angle factor.

To bring the Blake and single-toggle type crusher capacity test results to common terms for evaluation, all data are converted to terms of 10 x 7 in. Blake-type performance at conditions of 100 lb per cu ft, 10 in. chamber width, 250 rpm, 0.65 in. stroke, 3-in. open-side setting, and 18 nip-angle. (The nip-angle of the 107 in. Blake is 18 at 3-in. setting.) The single-toggle crusher performances are also divided by the eccentric throw to bring this effect to unity.

In the Blake-type crusher tests, no capacity variation was noted for materials of different crushabilities, even though a wide range of materials was tested. These feeds had impact strengths ranging from 2.8 to 31 ft lb per in. of thickness as measured by the Bond method, (potash, coke, soft hematite, limestones, traprock, taconites.)

Greater differences in crushability-capacity effect than those just discussed for single-toggle type crushers have been reported by investigators working with small Dodge-type crushers. However, these crushers have rubbing motion between the jaws at the discharge, and in addition have very little jaw stroke at the discharge.

double toggle oil type jaw crusher equipments / machine from r-techno in gujarat, india

double toggle oil type jaw crusher equipments / machine from r-techno in gujarat, india

Oil type jaw crushers are configured for primary & secondary crushing of even hardest rock at hardest speed with minimum power. The crusher is designed on principal of crushing without rubbing, with high impact pressure. A closed chamber prevents dust thus our Jaw Crushers are considerably higher than that of conventional crushers. The company crushers are designed for long life service with minimum maintenance with high quality promised for hard, tough, abrasive material and overload high capacity. Assembly has main body of mild steel, Pitman is always in compression condition, having unique design filled with metal, one is always in contact with crank shaft and other is in contact with Pin. Jaw works through front & rear toggle which are in contact with pitman & pin, thus the compression force diverts in three directions. Care should be taken of oil viscosity whether is not viscous then have to refill oil chamber. These crushers are high production capacity with low power consumption compare to grease type jaw crushers.

double toggle jaw crusher,stone crusher manufacturer-jaw crushers

double toggle jaw crusher,stone crusher manufacturer-jaw crushers

Our Jaw Crushers are configured for Primary & Secondary crushing of even hardest rock at hardest speed with minimum power. The crusher is designed on principal of Crushing without Rubbing with high impact pressure. Our Jaw Crushers are considerably higher than that of conventional crushers, without rubbing & requires minimum dust oil lubrication.

The company crushers are designed for long life service,Double Toggle Jaw Crusher Manufacturer with minimum maintenance with high quality promised for hard, tough, abrasive material and overload high capacity. The company all products are also well suited to high efficiency, large capacity size operation.

2019 ROYAL JAW CRUSHER. Powered by : #1 Vinayak InfoSoft- Best SEO company India- Last Updated : 01-July-2021 [Vin.Y.R] | Crusher Plant Machine Supplier | Uttarakhand | Raipur | Chandigarh | Saharanpur | Udaipur | Mumbai | Delhi | Bangalore | Chennai | Crushing Plant || Crusher Machine Exporter in India

jaw stone crusher | single toggle vs double toggle - jxsc mine

jaw stone crusher | single toggle vs double toggle - jxsc mine

Jaw stone crusher is heavy duty machines and hence need to be robustly constructed. The movable jaw and static jaw are made up of the crushing chamber. It stimulates the movement of the two jaws of the Animal and completes working. Widely used in mining smelting, building materials, roads, railways, water conservancy, and chemical industries in a variety of ore and large pieces of material crushing. The classification of Jaw crusher: single toggle jaw crusher, double toggle jaw crusher, hydraulic jaw crusher, impact jaw rock crusher, mobile jaw stonecrusher, etc. Which jaw crusher better single toggle or double toggle.

The movable jaw is suspended from the mandrel and swings from side to side. When the eccentric axis rotates, the connecting rod moves up and down. And drives the two thrust plates to move back and forth as well. Thus pushing the jaw to move left and right to move back and forth, realizing crushing and discharging.

This kind of crusher adopts a crank two-bar linkage mechanism. Although the moving jaw is subjected to a great crushing reaction. Its eccentric shaft and connecting rod are subjected to a little force. So it is often made into large and medium-sized machines for crushing hard materials in the industry. In addition, when the crushers work, the movement track of each point on the moving jaw is a circular arc with the center of the center axis.

The radius of the circular arc is equal to the distance from the point to the axis. The upper arc is small, the lower arc is large, and the crushing efficiency is low. The fragmentation ratio is generally 3-6. Because the movement track is simply so-called a single toggle jaw crusher. The structure of the single toggle jaw crusher is compact and simple, and the force of transmission parts such as eccentric shaft is small. The vertical displacement of the movable jaw is small, the material is less excessively broken and the wear of movable jaw plate is small.

The upper end of the movable jaw is directly suspended on the eccentric shaft. As the connecting rod of the crank connecting Rod mechanism, the lower end of the movable jaw is supported on the back wall of the frame by the thrust plate. When the eccentric axis rotates, the track of each point on the movable jaw is from the circumference line of the suspension point (the radius is equal to the eccentric distance), and gradually becomes an ellipse. The movement track of each point on moving jaw is more complex in this kind of machine, so it is called a double toggle jaw crusher.

Compared with the single toggle jaw stone crusher, the double-toggle jaw crusher has the following advantages: less weight, fewer components, more compact structure, a better filling degree in the crushing chamber, even crushing of the loaded material block, and forced unloading of the finished product by moving the lower jaw. Therefore, productivity is higher, 20-30% higher than that of the single-toggle of the same specification. And the material block has a bigger up-down rolling motion in the lower part of the moving jaw, so it is easy to be discharged in the shape of a cube.

First of all, the choice of the crusher machine is determined by the size of feeding and discharging. The feeding degree, product size is coarse, choose the big jaw crusher or more coarse, otherwise use medium and fine. In the calculation of feed size, the maximum open-side feed size is multiplied by 0.85. And the average size of the product is calculated by dividing the maximum feed size by the crushing ratio. In general, the feed size distribution of jaw crushers cannot exceed 10 %. If more than 10 %, the power consumption will increase and the product size will become flaky.

Secondly, when choosing the liner of jaw stone crushers equipment, the user must consider three factors: output, power consumption and wear resistance of liner. In general, the following principles should be followed: maximum feeding size, size change, the size distribution of feeding, the hardness of a material, Abrasion Resistance of materials. The longer the jaw crusher liner, the higher the power consumption, hard materials choose short liner, soft materials choose longliner. In the distribution of materials, thin materials choose short liner, coarse materials choose longliners.

Finally, the crusher in the work, feeding to uniform, can not segregation. If the uneven feeding will occur production capacity reduction, product size is too large, frequent spring action, bowl-shaped bearing pressure, power consumption rise. And it must have iron remover to prevent crushing chamber over iron. If frequent over iron, it may cause shaft broken accident. The moisture content of viscous materials can affect the amount of material through. In terms of moisture content of materials, generally not more than 5 %. In the use of power: Standard stone crusher should reach 75% ~ 80 %, short head crusher should reach 80% ~ 85 %.

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

double-toggle blake crusher | henan deya machinery co., ltd

double-toggle blake crusher | henan deya machinery co., ltd

The distinctive feature of this class of crusher is the two plates which open and shut like animal jaws. The jaws are set at an acute angle to each other, and one jaw is pivoted so that it swings relative to the other fixed jaw. Material fed into the jaws is alternately nipped and released to fall further into the crushing chamber. Eventually it falls from the discharge aperture.

Jaw crushers are classified by the method of pivoting the swing jaw (see attached figure). In the Blake crusher the jaw is pivoted at the top and thus has a fixed receiving area and a variable discharge opening. In the Dodge crusher the jaw is pivoted at the bottom, giving it a variable feed area but fixed delivery area. The Dodge crusher is restricted to laboratory use, where close sizing is required, and is never used for heavy-duty crushing as it chokes very easily. The Universal crusher is pivoted in an intermediate position, and thus has a variable delivery and receiving area. Read more

jaw crusher introduction, jaw crusher pe 500x700 | henan deya machinery co., ltd

jaw crusher introduction, jaw crusher pe 500x700 | henan deya machinery co., ltd

The distinctive feature of this class of crusher is the two plates which open and shut like animal jaws. The jaws are set at an acute angle to each other, and one jaw is pivoted so that it swings relative to the other fixed jaw. Material fed into the jaws is alternately nipped and released to fall further into the crushing chamber. Eventually it falls from the discharge aperture.

Jaw crushers are classified by the method of pivoting the swing jaw (see attached figure). In the Blake crusher the jaw is pivoted at the top and thus has a fixed receiving area and a variable discharge opening. In the Dodge crusher the jaw is pivoted at the bottom, giving it a variable feed area but fixed delivery area. The Dodge crusher is restricted to laboratory use, where close sizing is required, and is never used for heavy-duty crushing as it chokes very easily. The Universal crusher is pivoted in an intermediate position, and thus has a variable delivery and receiving area.

The Blake crusher was patented by W.E. Blake in 1858 and variations in detail on the basic form are found in most of the jaw crushers used today. There are two forms of the Blake crusher double toggle and single toggle.

In this model (see attached figure), the oscillating movement of the swinging jaw is effected by vertical movement of the pitman. This moves up and down under the influence of the eccentric. The back toggle plate causes the pitman to move sideways as it is pushed upward. This motion is transferred to the front toggle plate and this in turn causes the swing jaw to close on the fixed jaw. Similarly, downward movement of the pitman allows the swing jaw to open. Blake jaw crusher (functional diagram) The important features of the machine are: Since the jaw is pivoted from above, it moves a minimum distance at the entry point and a maximum distance at the delivery. This maximum distance is called the throw of the crusher. The horizontal displacement of the swing jaw is greatest at the bottom of the pitman cycle and diminishes steadily through the rising half of the cycle as the angle between the pitman and the back toggle plate becomes less acute. The crushing force is least at the start of the cycle, when the angle between the toggles is most acute, and is strongest at the top, when full power is delivered over a reduced travel of the jaw. Attached figure shows a cross-section through a double toggle jaw crusher. All jaw crushers are rated according to their receiving areas, i.e. the width of the plates and the gape, which is the distance between the jaws at the feed opening. For example, 500x750mm jaw crusher has a width of 500 mm and a gape of 750 mm. Cross-section through double-toggle crusher Consider a large piece of rock falling into the mouth of the crusher. It is nipped by the jaws, which are moving relative to each other at a rate depending on the size of the machine and which usually varies inversely with the size. Basically, time must be given for the rock broken at each bite to fall to a new position before being nipped again. The ore falls until it is arrested. The swing jaw closes on it, quickly at first and then more slowly with increasing power towards the end of the stroke. The fragments now fall to a new arrest point as the jaws move apart and are then gripped and crushed again. During each bite of the jaws the rock swells in volume due to the creation of voids between the particles. Since the ore is also falling into a gradually reducing cross-sectional area of the crushing chamber, choking of the crusher would soon occur if it were not for the increasing amplitude of swing towards the discharge end of the crusher. This accelerates the material through the crusher, allowing it to discharge at a rate sufficient to leave space for material entering above. This is arrested or free crushing as opposed to choked crushing, which occurs when the volume of material arriving at a particular cross-section is greater than that leaving. In arrested crushing, crushing is by the jaws only, whereas in choked crushing, particles break each other. This interparticle comminution can lead to excessive production of fines, and if choking is severe can damage the crusher. The discharge size of material from the crusher is controlled by the set, which is the maximum opening of the jaws at the discharge end. This can be adjusted by using toggle plates of the required length. Wear on the jaws can be taken up by adjusting the back pillow into which the back toggle plate bears. A number of manufacturers offer jaw setting by hydraulic jacking, and some fit electromechanical systems which allow remote control. A feature of all jaw crushers is the heavy flywheel attached to the drive, which is necessary to store energy on the idling half of the stroke and deliver it on the crushing half. Since the jaw crusher works on half-cycle only, it is limited in capacity for its weight and size. Due to its alternate loading and release of stress, it must be very rugged and needs strong foundations to accommodate the vibrations. Single-toggle jaw crushers In this type of crusher (see attached figure) the swing jaw is suspended on the eccentric shaft, which allows a lighter, more compact design than with the double-toggle machine. The motion of the swing jaw also differs from that of the double-toggle design. Not only does the swing jaw move towards the fixed jaw, under the action of the toggle plate, but it also moves vertically as the eccentric rotates. This elliptical jaw motion assists in pushing rock through the crushing chamber. The single-toggle machine therefore has a somewhat higher capacity than the double-toggle machine of the same gape. The eccentric movement, however, increases the rate of wear on the jaw plates. Direct attachment of the swing jaw to the eccentric imposes a high degree of strain on the drive shaft, and so maintenance costs tend to be higher than with the double-toggle machine. Double-toggle machines cost about 50% more than single-toggle machines of the same size, and are usually used on tough, hard, abrasive materials. Cross-section of single-toggle jaw crusher Jaw-crusher construction Jaw crushers are extremely heavy-duty machines and hence must be robustly constructed. The main frame is often made from cast iron or steel, connected with tie-bolts. It is often made in sections so that it can be transported underground for installation. Modern jaw crushers may have a main frame of mild steel plate welded together. The jaws themselves are usually constructed from cast steel and are fitted with replaceable liners, made from manganese steel, or Ni-hard, a Ni-Cr alloyed cast iron. Apart from reducing wear, hard liners are essential in that they minimize crushing energy consumption, reducing the deformation of the surface at each contact point. They are bolted in sections on to the jaws so that they can be removed easily and reversed periodically to equalize wear. Cheek plates are fitted to the sides of the crushing chamber to protect the main frame from wear. These are also made from hard alloy steel and have similar lives to the jaw plates. The jaw plates themselves may be smooth, but are often corrugated, the latter being preferred for hard, abrasive materials. Patterns on the working surface of the crushing members also influence capacity, especially at small settings. Laboratory tests have demonstrated that the capacity is reduced about 50 times when a corrugated profile is used rather than a smooth surface. The corrugated profile is claimed to perform compound crushing by compression, tension, and shearing. Conventional smooth crushing plates tend to perform crushing by compression only, though irregular particles under compression loading might still break in tension. Since rocks are around 10 times weaker in tension than compression, power consumption and wear costs should be lower with the corrugated profiles. Nevertheless, some type of pattern is desirable for the jaw plate surface in a jaw crusher, partly to reduce the risk of undesired large flakes easily slipping through the straight opening, and partly to reduce the contact surface when crushing flaky blocks. In several installations, a slight wave shape has proved successful. The angle between the jaws is usually less than 26 degree as the use of a larger angle than this causes slipping, which reduces capacity and increases wear. In order to overcome problems of choking near the discharge of the crusher, which is possible if fines are present in the feed, curved plates are sometimes used. The lower end of the swing jaw is concave, whereas the opposite lower half of the fixed jaw is convex. This allows a more gradual reduction in size as the material nears the exit, hence minimizing the chances of packing. Less wear is also reported on the jaw plates, since the material is distributed over a larger area. The speed of jaw crushers varies inversely with the size, and usually lies in the range of 100-350 RPM. The main criterion in determining the optimum speed is that particles must be given sufficient time to move down the crusher throat into a new position before being nipped again. The maximum amplitude of swing of the jaw, or throw, is determined by the type of material being crushed and is usually adjusted by changing the eccentric. It varies from 1 to 7 cm depending on the machine size, and is highest for tough, plastic material and lowest for hard, brittle ore. The greater the throw, the less danger is there of chokage, as material is removed more quickly. This is offset by the fact that a large throw tends to produce more fines, which inhibits arrested crushing. Large throws also impart higher working stresses to the machine. In all crushers, provision must be made for avoiding the damage which could result from uncrushable material entering the chamber. Many jaw crushers are protected from such tramp material (usually metal objects) by a weak line of rivets on one of the toggle plates, although automatic tripout devices are now becoming more common, and one manufacturer uses automatic overload protection based on hydraulic cylinders between the fixed jaw and the frame. In the event of excessive pressure caused by an overload, the jaw is allowed to open, normal gap conditions being reasserted after clearance of the blockage. This allows a full crusher to be started under load. Jaw crushers range in size up to 1680 mm gape by 2130 mm width. This size machine will handle ore with a maximum size of 1.22 m at a crushing rate of approximately 725 TPH with a 203mm set. However, at crushing rates above 545 TPH the economic advantage of the jaw crusher over the gyratory diminishes; and above 725 TPH jaw crushers cannot compete with gyratory crushers. Assemble drawing and foundation drawing of typical model PE500x750 jaw crusher foundation drawing PE500x750 assemble drawing PE500x750 Jaw crusher produced by Henan Deya Machinery Co., Ltd. edfcofcofedfedfedfjaw-crusher-pe500x700_02jaw-crusher-pe500x700_01

Attached figure shows a cross-section through a double toggle jaw crusher. All jaw crushers are rated according to their receiving areas, i.e. the width of the plates and the gape, which is the distance between the jaws at the feed opening. For example, 500x750mm jaw crusher has a width of 500 mm and a gape of 750 mm.

Consider a large piece of rock falling into the mouth of the crusher. It is nipped by the jaws, which are moving relative to each other at a rate depending on the size of the machine and which usually varies inversely with the size. Basically, time must be given for the rock broken at each bite to fall to a new position before being nipped again. The ore falls until it is arrested. The swing jaw closes on it, quickly at first and then more slowly with increasing power towards the end of the stroke. The fragments now fall to a new arrest point as the jaws move apart and are then gripped and crushed again. During each bite of the jaws the rock swells in volume due to the creation of voids between the particles. Since the ore is also falling into a gradually reducing cross-sectional area of the crushing chamber, choking of the crusher would soon occur if it were not for the increasing amplitude of swing towards the discharge end of the crusher. This accelerates the material through the crusher, allowing it to discharge at a rate sufficient to leave space for material entering above. This is arrested or free crushing as opposed to choked crushing, which occurs when the volume of material arriving at a particular cross-section is greater than that leaving. In arrested crushing, crushing is by the jaws only, whereas in choked crushing, particles break each other. This interparticle comminution can lead to excessive production of fines, and if choking is severe can damage the crusher.

The discharge size of material from the crusher is controlled by the set, which is the maximum opening of the jaws at the discharge end. This can be adjusted by using toggle plates of the required length. Wear on the jaws can be taken up by adjusting the back pillow into which the back toggle plate bears. A number of manufacturers offer jaw setting by hydraulic jacking, and some fit electromechanical systems which allow remote control.

A feature of all jaw crushers is the heavy flywheel attached to the drive, which is necessary to store energy on the idling half of the stroke and deliver it on the crushing half. Since the jaw crusher works on half-cycle only, it is limited in capacity for its weight and size. Due to its alternate loading and release of stress, it must be very rugged and needs strong foundations to accommodate the vibrations.

In this type of crusher (see attached figure) the swing jaw is suspended on the eccentric shaft, which allows a lighter, more compact design than with the double-toggle machine. The motion of the swing jaw also differs from that of the double-toggle design. Not only does the swing jaw move towards the fixed jaw, under the action of the toggle plate, but it also moves vertically as the eccentric rotates. This elliptical jaw motion assists in pushing rock through the crushing chamber. The single-toggle machine therefore has a somewhat higher capacity than the double-toggle machine of the same gape. The eccentric movement, however, increases the rate of wear on the jaw plates. Direct attachment of the swing jaw to the eccentric imposes a high degree of strain on the drive shaft, and so maintenance costs tend to be higher than with the double-toggle machine. Double-toggle machines cost about 50% more than single-toggle machines of the same size, and are usually used on tough, hard, abrasive materials. Cross-section of single-toggle jaw crusher Jaw-crusher construction Jaw crushers are extremely heavy-duty machines and hence must be robustly constructed. The main frame is often made from cast iron or steel, connected with tie-bolts. It is often made in sections so that it can be transported underground for installation. Modern jaw crushers may have a main frame of mild steel plate welded together. The jaws themselves are usually constructed from cast steel and are fitted with replaceable liners, made from manganese steel, or Ni-hard, a Ni-Cr alloyed cast iron. Apart from reducing wear, hard liners are essential in that they minimize crushing energy consumption, reducing the deformation of the surface at each contact point. They are bolted in sections on to the jaws so that they can be removed easily and reversed periodically to equalize wear. Cheek plates are fitted to the sides of the crushing chamber to protect the main frame from wear. These are also made from hard alloy steel and have similar lives to the jaw plates. The jaw plates themselves may be smooth, but are often corrugated, the latter being preferred for hard, abrasive materials. Patterns on the working surface of the crushing members also influence capacity, especially at small settings. Laboratory tests have demonstrated that the capacity is reduced about 50 times when a corrugated profile is used rather than a smooth surface. The corrugated profile is claimed to perform compound crushing by compression, tension, and shearing. Conventional smooth crushing plates tend to perform crushing by compression only, though irregular particles under compression loading might still break in tension. Since rocks are around 10 times weaker in tension than compression, power consumption and wear costs should be lower with the corrugated profiles. Nevertheless, some type of pattern is desirable for the jaw plate surface in a jaw crusher, partly to reduce the risk of undesired large flakes easily slipping through the straight opening, and partly to reduce the contact surface when crushing flaky blocks. In several installations, a slight wave shape has proved successful. The angle between the jaws is usually less than 26 degree as the use of a larger angle than this causes slipping, which reduces capacity and increases wear. In order to overcome problems of choking near the discharge of the crusher, which is possible if fines are present in the feed, curved plates are sometimes used. The lower end of the swing jaw is concave, whereas the opposite lower half of the fixed jaw is convex. This allows a more gradual reduction in size as the material nears the exit, hence minimizing the chances of packing. Less wear is also reported on the jaw plates, since the material is distributed over a larger area. The speed of jaw crushers varies inversely with the size, and usually lies in the range of 100-350 RPM. The main criterion in determining the optimum speed is that particles must be given sufficient time to move down the crusher throat into a new position before being nipped again. The maximum amplitude of swing of the jaw, or throw, is determined by the type of material being crushed and is usually adjusted by changing the eccentric. It varies from 1 to 7 cm depending on the machine size, and is highest for tough, plastic material and lowest for hard, brittle ore. The greater the throw, the less danger is there of chokage, as material is removed more quickly. This is offset by the fact that a large throw tends to produce more fines, which inhibits arrested crushing. Large throws also impart higher working stresses to the machine. In all crushers, provision must be made for avoiding the damage which could result from uncrushable material entering the chamber. Many jaw crushers are protected from such tramp material (usually metal objects) by a weak line of rivets on one of the toggle plates, although automatic tripout devices are now becoming more common, and one manufacturer uses automatic overload protection based on hydraulic cylinders between the fixed jaw and the frame. In the event of excessive pressure caused by an overload, the jaw is allowed to open, normal gap conditions being reasserted after clearance of the blockage. This allows a full crusher to be started under load. Jaw crushers range in size up to 1680 mm gape by 2130 mm width. This size machine will handle ore with a maximum size of 1.22 m at a crushing rate of approximately 725 TPH with a 203mm set. However, at crushing rates above 545 TPH the economic advantage of the jaw crusher over the gyratory diminishes; and above 725 TPH jaw crushers cannot compete with gyratory crushers. Assemble drawing and foundation drawing of typical model PE500x750 jaw crusher foundation drawing PE500x750 assemble drawing PE500x750 Jaw crusher produced by Henan Deya Machinery Co., Ltd. edfcofcofedfedfedfjaw-crusher-pe500x700_02jaw-crusher-pe500x700_01

Jaw crushers are extremely heavy-duty machines and hence must be robustly constructed. The main frame is often made from cast iron or steel, connected with tie-bolts. It is often made in sections so that it can be transported underground for installation. Modern jaw crushers may have a main frame of mild steel plate welded together.

The jaws themselves are usually constructed from cast steel and are fitted with replaceable liners, made from manganese steel, or Ni-hard, a Ni-Cr alloyed cast iron. Apart from reducing wear, hard liners are essential in that they minimize crushing energy consumption, reducing the deformation of the surface at each contact point. They are bolted in sections on to the jaws so that they can be removed easily and reversed periodically to equalize wear. Cheek plates are fitted to the sides of the crushing chamber to protect the main frame from wear. These are also made from hard alloy steel and have similar lives to the jaw plates. The jaw plates themselves may be smooth, but are often corrugated, the latter being preferred for hard, abrasive materials. Patterns on the working surface of the crushing members also influence capacity, especially at small settings. Laboratory tests have demonstrated that the capacity is reduced about 50 times when a corrugated profile is used rather than a smooth surface. The corrugated profile is claimed to perform compound crushing by compression, tension, and shearing. Conventional smooth crushing plates tend to perform crushing by compression only, though irregular particles under compression loading might still break in tension. Since rocks are around 10 times weaker in tension than compression, power consumption and wear costs should be lower with the corrugated profiles. Nevertheless, some type of pattern is desirable for the jaw plate surface in a jaw crusher, partly to reduce the risk of undesired large flakes easily slipping through the straight opening, and partly to reduce the contact surface when crushing flaky blocks. In several installations, a slight wave shape has proved successful. The angle between the jaws is usually less than 26 degree as the use of a larger angle than this causes slipping, which reduces capacity and increases wear.

In order to overcome problems of choking near the discharge of the crusher, which is possible if fines are present in the feed, curved plates are sometimes used. The lower end of the swing jaw is concave, whereas the opposite lower half of the fixed jaw is convex. This allows a more gradual reduction in size as the material nears the exit, hence minimizing the chances of packing. Less wear is also reported on the jaw plates, since the material is distributed over a larger area.

The speed of jaw crushers varies inversely with the size, and usually lies in the range of 100-350 RPM. The main criterion in determining the optimum speed is that particles must be given sufficient time to move down the crusher throat into a new position before being nipped again.

The maximum amplitude of swing of the jaw, or throw, is determined by the type of material being crushed and is usually adjusted by changing the eccentric. It varies from 1 to 7 cm depending on the machine size, and is highest for tough, plastic material and lowest for hard, brittle ore. The greater the throw, the less danger is there of chokage, as material is removed more quickly. This is offset by the fact that a large throw tends to produce more fines, which inhibits arrested crushing. Large throws also impart higher working stresses to the machine.

In all crushers, provision must be made for avoiding the damage which could result from uncrushable material entering the chamber. Many jaw crushers are protected from such tramp material (usually metal objects) by a weak line of rivets on one of the toggle plates, although automatic tripout devices are now becoming more common, and one manufacturer uses automatic overload protection based on hydraulic cylinders between the fixed jaw and the frame. In the event of excessive pressure caused by an overload, the jaw is allowed to open, normal gap conditions being reasserted after clearance of the blockage. This allows a full crusher to be started under load.

Jaw crushers range in size up to 1680 mm gape by 2130 mm width. This size machine will handle ore with a maximum size of 1.22 m at a crushing rate of approximately 725 TPH with a 203mm set. However, at crushing rates above 545 TPH the economic advantage of the jaw crusher over the gyratory diminishes; and above 725 TPH jaw crushers cannot compete with gyratory crushers.

jaw crusher, double toggle jaw crushers, single toggle jaw crushers, gujarat, india

jaw crusher, double toggle jaw crushers, single toggle jaw crushers, gujarat, india

Double Toggle Jaw Crushers are preferred for crushing ususually hard, abrasive rocks and other materials like ferroalloys and glass. They differ substantially from other types of crushers. There is no rotary motion in the crushing cycle and all crushing is done by compression of the feed material between two massive jaws plates. The moving jaw compresses the material against the stationary jaw. Jaw plates can be either smooth or corrugated.

Double Toggle Jaw Crushers have one jaw fixed, while the other pivots about a top hinge. This moving jaw is shaped to move firmly and squarely against the material. There is no rubbing or grinding. Only compression, which produces a generally cubical product with minimum fines. The moving jaw is very well balanced, so 95% of the drive motor power is ued for crushing. While only 5% of the power is needed to move the jaw itself. As a result of this high mechanical efficiency, double Toggle Jaw Crushers require smaller size motors, keeping power costs down. Behind the stationary jaw are shims, used to adjust the distance between the lower ends of the jaws (closed side setting). The setting determines the output product size. There is also an arrangement of safety arm for protection from us-crushables accidental overloads.

difference between double and single toggle jaw crusher

difference between double and single toggle jaw crusher

The main difference between Double and Single Toggle Jaw Crusher is the location of the eccentric shaft. In double toggle machines, the eccentric shaft is located behind the swing jaw, and the swing jaw is pivoted separately from another shaft. On the other hand, the swing jaw of single toggle jaw crusher is pivoted directly on the eccentric shaft. This helps the single toggle crusher achieve a more aggressive crushing stroke, and hence the apparent popularity.

That said, Double Toggle Jaw Crushers have been hugely successful in the past. They offer a better operational economy as compared to Single Toggle Jaw Crushers. The jaw plate consumption is less by almost 4 times and the percentage of fines generated is also smaller.

Double toggle jaw crushers, however, are heavier and require much larger headroom than single toggle machines. They therefore are generally unsuitable for mobile operations. To add to that, they accept smaller feed size and have a much lower throughput. They are also prone to choking and bridging while crushing. In contrast, single toggle jaw crushers have fewer moving parts and aggressive crushing strokes. Being technologically superior, they have mostly replaced the double toggle jaw crushers.

In a Double Toggle Jaw Crusher the eccentric shaft is located behind the swinging jaw. This protects the eccentric shaft and bearings from the shock loading. Two toggle plates from either side of the pitman are respectively connected to the back of the crusher and the swing jaw.

As the eccentric shaft rotates, reciprocation of the pitman causes to and fro swinging door motion of the moving jaw. This creates a powerful compression in the crushing chamber. Thus a double toggle jaw crusher is more effective for crushing very strong abrasive rocks. Since there is no other plane of motion, there is lesser wear and tear of the jaw plate but also lesser throughput.

Single toggle jaw crusher is a modern design which is lighter, has greater throughput and is less expensive than a double toggle jaw crusher. The eccentric shaft in this design acts as the pivot as well as the actuator for the reciprocation. The toggle plate directly connects the back of the crusher to the swinging jaw.

The single toggle jaw crusher has fewer bearings and shafts as compared to a double toggle jaw crusher. It has more planes of movement of the swinging jaw (Hinge door movement plus vertical up and down movement) which leads to higher throughput. On the downside, it produces more fines, and has a higher jaw plate consumption.

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