CN216704667U - Jaw crusher with multi-stage screening function - Google Patents

Abstract

The utility model discloses a jaw crusher with a multi-stage screening function, which comprises a screening box arranged on the outer wall of the bottom of a crusher body, wherein a telescopic clamping plate is fixedly connected to the inner wall of the top of the screening box; the inner wall of the bottom of the screening box is fixedly connected with a material collecting seat, the top of the material collecting seat is inclined, the outer wall of one side of the material collecting seat is fixedly connected with a plurality of supports, the outer walls of the tops of the supports are fixedly connected with at least one buffer, each buffer comprises a rubber cylinder, a powerful spring and an annular cylinder, the inner wall of each buffer is connected with a screening plate through a limiting structure, and each screening plate is inclined; the screening box is far away from the collection box and is fixedly connected with a collection box on the inner wall of the bottom of the collection seat. The utility model is convenient to control the feeding amount of the material on the collecting seat falling onto the top end screening plate, so that the falling amount on the screening plate is always kept consistent, the screening efficiency is prevented from being influenced by excessive material accumulated by the screening plate at one time, and the service life of the screening plate is prolonged.

Description

Jaw crusher with multi-stage screening function

Technical Field

The utility model relates to the technical field of jaw crushers, in particular to a jaw crusher with a multi-stage screening function.

Background

The jaw crusher is widely applied to industries such as mine, smelting, building materials, highway, railway, water conservancy, chemical industry and the like, is mainly used for crushing various ores and large materials with medium granularity, and the conventional method is to independently complete the crushing and screening. Produce great detritus easily among the jaw breaker crushing process, these great detritus can't pass through the square hole sieve when falling screening plant on with the target detritus together, when the big detritus of accumulation on the square hole sieve is more and more, will influence the normal work of square hole sieve, needs the manual work to shut down and clears up, influences production efficiency.

In order to solve the problem, through the retrieval, chinese patent application number is CN 201921855020.1's patent, discloses a screening plant who installs additional on jaw breaker, including setting up the support of terminal surface under jaw breaker, the support up end is seted up with jaw breaker discharge gate just right through-hole, and long-pending storage bucket has been arranged to the through-hole below, and the thrust plate support in the jaw breaker is connected with the horizontal pole through the connecting rod, symmetrical arrangement has reciprocating motion device on the left end of horizontal pole and the left side inner wall of support, the position that lies in directly over long-pending storage bucket between the reciprocating motion device is connected with the sieve material filter material device that can carry out sieve material simultaneously and get rid of big crushed grain work. The screening device added on the jaw crusher in the patent has the following defects: the speed of unable adaptation jaw breaker unloading, when the unloading speed is very fast, the material very easily can pile up on sieve material filter material sieve, causes the jam to a certain extent, and then leads to unable sieve to strain.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a jaw crusher with a multi-stage screening function.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a jaw crusher with a multi-stage screening function comprises a screening box arranged on the outer wall of the bottom of a crusher body, wherein a telescopic clamping plate is fixedly connected to the inner wall of the top of the screening box; the screening box is characterized in that a collecting seat is fixedly connected to the inner wall of the bottom of the screening box, the top of the collecting seat is in an inclined shape, a plurality of supports are fixedly connected to the outer wall of one side of the collecting seat, at least one buffer is fixedly connected to the outer walls of the tops of the supports, each buffer comprises a rubber cylinder, a powerful spring and an annular cylinder, a sub-screening plate is connected to the inner wall of each buffer through a limiting structure, and the sub-screening plate is in an inclined shape; the inner wall of the bottom of the screening box, which is far away from the material collecting seat, is fixedly connected with a collecting box, and the outer wall of one side of the screening plate is arranged on the outer wall of one side of the collecting box; the both sides outer wall of collecting seat all is provided with the rim plate, the one end fixedly connected with connecting block of rim plate, two linking arms that length is unequal of circumference outer wall fixedly connected with of connecting block, and one side outer wall of two linking arms is connected in one side outer wall and one of them one side outer wall that divides the sieve that flexible cardboard extends the end through the fixed column respectively.

As a still further scheme of the utility model: the limiting structure comprises a branch assembly, a thread adjusting rod and two connecting plates, wherein the top end and the bottom end of the branch assembly are respectively fixedly connected to the outer walls of the bottom and the outer walls of the top of the two connecting plates, one of the outer walls of the bottom of the connecting plates is fixedly connected to the top end of the buffer, the outer wall of the top of the other connecting plate is arranged on the outer wall of the bottom of the thread adjusting rod, and the outer wall of the circumference of the thread adjusting rod is arranged on the inner wall of the circumference of the buffer.

As a still further scheme of the utility model: the top outer wall of screening case is provided with the feed opening, and the bottom inner wall of screening case is the slope form, one side outer wall of screening case is provided with the chamber door.

As a still further scheme of the utility model: the outer wall of one side of flexible cardboard is fixedly connected with rubber soft board.

As a still further scheme of the utility model: the outer wall of one side of the collecting box, which is close to the separating sieve plate, is provided with a plurality of feed inlets, the outer wall of the other side of the collecting box is provided with a plurality of discharge outlets, and the number of the discharge outlets is the same as that of the feed inlets.

As a still further scheme of the utility model: collect a plurality of dust outlets of one side outer wall fixedly connected with of box, the top of a plurality of dust outlets all is provided with the filtration lid.

As a still further scheme of the utility model: the inner wall of one side of relative of screening case all is provided with a plurality of spouts, and spout one side inner wall fixedly connected with folding cover is two spouts of relative position and establishes to a set of, and the inner wall of every group spout all is provided with same backing roll.

As a still further scheme of the utility model: a plurality of divide the equal a plurality of connection sub-assemblies of fixedly connected with of bottom face of sieve, connect the sub-assembly and include that long slab and arc constitute, the bottom outer wall of long slab sets up in the top outer wall of arc, and the bottom outer wall of long slab is provided with the draw-in groove, and the top outer wall fixed connection of arc has elastic fixture block.

Compared with the prior art, the utility model provides a jaw crusher with a multi-stage screening function, which has the following beneficial effects:

1. this jaw breaker with function is strained to multistage sieve, the material falls to the top face of the seat that gathers materials, the unloading speed to the material cushions, avoid the material once only to fall to on dividing the sieve, cause and divide the impaired unable use that leads to of sieve plate, when being located the blanking on the sieve plate is divided to the top, should divide the sieve plate to receive heavy downward compression buffer, the linking arm on this branch sieve plate moves downwards passively, the impeller dish clockwise rotation, and through the synchronous drive of linking arm on the flexible cardboard, make flexible cardboard move downwards, be convenient for control the feeding volume that the material on the seat that gathers materials falls to the top branch sieve plate, make the blanking volume on this branch sieve plate remain unanimous all the time, avoid this branch sieve plate once only to pile up too much influence screening efficiency of material, prolong its life.

2. This jaw breaker with function is strained to multistage sieve, on the below of material process flexible cardboard got into the branch sieve board of slope form, the buffer is extruded downwards, makes the branch sieve use its junction with collecting the box as the base point and top up float, and then divides the material on the sieve to the aperture from big to little multilayer to carry out the branch sieve layer upon layer and strain the selection, is convenient for carry out the branch sieve to the material and selects the material.

3. This jaw breaker with function is strained to multistage sieve divides the sieve material, when dividing the sieve board to receive heavy extrusion buffer descending downwards, drives the backing roll simultaneously and goes up and down in the spout, and folding cover avoids in the dust gets into the spout, effectively avoids dividing the sieve to receive heavy cracked condition emergence of being pressed through the backing roll, further extension branch sieve's life.

Drawings

FIG. 1 is a schematic cross-sectional view of a screening box of a jaw crusher with multi-stage screening function according to the present invention;

FIG. 2 is a schematic view of the overall structure of a jaw crusher with multi-stage screening function according to the present invention;

FIG. 3 is a schematic side sectional view of a screening box of a jaw crusher with multi-stage screening function according to the present invention;

FIG. 4 is a schematic view of the expanded structure of the connecting assembly of a jaw crusher with multi-stage screening function according to the present invention;

FIG. 5 is an enlarged view of part A of a jaw crusher with multi-stage screening function according to the present invention;

fig. 6 is an exploded view of a supporting bar assembly, a threaded adjusting rod and a buffer of a jaw crusher with multi-stage screening function according to the present invention.

In the figure: 1-screening box, 2-crusher body, 3-box door, 4-feed opening, 5-telescopic clamping plate, 6-rubber soft plate, 7-connecting assembly, 8-collecting box, 9-supporting roller, 10-folding cover, 11-feed opening, 12-support, 13-buffer, 14-collecting seat, 15-wheel disc, 16-connecting arm, 17-filtering cover, 18-dust outlet, 19-discharge opening, 20-screening plate, 21-clamping groove, 22-elastic clamping block, 23-supporting strip component, 24-screw thread adjusting rod and 25-connecting plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example 1

In order to control the feeding amount falling onto a screening plate 20, the jaw crusher with the multi-stage screening function comprises a screening box 1 arranged on the outer wall of the bottom of a crusher body 2, and a telescopic clamping plate 5 is fixed on the inner wall of the top of the screening box 1 through bolts, as shown in figures 1 to 3; the screening box comprises a screening box 1, a material collecting seat 14, a plurality of supporting seats 12, at least one buffer 13, a rubber cylinder, a powerful spring and an annular cylinder, wherein the material collecting seat 14 is fixed on the inner wall of the bottom of the screening box 1 through bolts, the top surface of the material collecting seat 14 is inclined, the supporting seats 12 are fixed on the outer wall of one side of the material collecting seat 14 through bolts, the at least one buffer 13 is fixed on the outer wall of the top of each supporting seat 12 through bolts, each buffer 13 comprises a rubber cylinder, a powerful spring and an annular cylinder, the inner wall of each buffer 13 is connected with a screening plate 20 through a limiting structure, and each screening plate 20 is inclined; the inner wall of the bottom of the screening box 1, which is far away from the material collecting seat 14, is fixed with a collecting box 8 through bolts, and the outer wall of one side of the screening plate 20 is connected with the outer wall of one side of the collecting box 8 through a hinge; the outer wall of the two sides of the material collecting seat 14 is connected with a wheel disc 15 through a rotating shaft in a rotating mode, one end of the wheel disc 15 is fixedly provided with a connecting block through a bolt, the outer wall of the circumference of the connecting block is fixedly provided with two connecting arms 16 with different lengths through bolts, and the outer wall of one side of each of the two connecting arms 16 is connected with the outer wall of one side of the extending end of the telescopic clamping plate 5 and the outer wall of one side of one of the sub-sieve plates 20 through a fixing column. From the broken material whereabouts in the breaker body 2 to the top face of the seat 14 that gathers materials, the unloading speed to the material cushions, avoid the material once only to fall to on dividing sieve plate 20, cause to divide sieve plate 20 impaired to lead to unable the use, the material glides in proper order gradually, on the below through flexible cardboard 5 gets into the branch sieve plate 20 of slope form, buffer 13 is pushed down, make and divide sieve plate 20 to use its junction with collection box 8 as the base point top and bottom float, and then divide the sieve to select from layer to the material on the big to little multilayer branch sieve plate 20 in the aperture, be convenient for carry out hierarchical screening selection to the material. When being located the blanking on the top divides sieve plate 20, should divide sieve plate 20 to receive heavy downward compression buffer 13, should divide the passive downstream of linking arm 16 on the sieve plate 20, promote wheel dish 15 clockwise rotation, and through the synchronous drive of linking arm 16 on the flexible cardboard 5, make flexible cardboard 5 downstream, and then the material on the control collecting seat 14 falls to the top and divides the feeding volume on the sieve plate 20, make the blanking volume on this minute sieve plate 20 remain the unanimity all the time, avoid this minute sieve plate 20 once only to pile up too much influence screening efficiency of material, prolong its life.

In order to connect and fix the buffer 13 and the screening plate 20, as shown in fig. 1, 3, 5 and 6, the limiting structure includes a supporting bar assembly 23, a threaded adjusting rod 24 and two connecting plates 25, the top end and the bottom end of the supporting bar assembly 23 are respectively fixed to the bottom outer wall and the top outer wall of the two connecting plates 25 through bolts, the bottom outer wall of one of the connecting plates 25 is fixed to the top end of the buffer 13 through bolts, the top outer wall of the other connecting plate 25 is rotatably connected to the bottom outer wall of the threaded adjusting rod 24, and the circumferential outer wall of the threaded adjusting rod 24 is connected to the circumferential inner wall of the buffer 13 through threads. During the installation, adjustment screw thread adjusting rod 24 upwards pulls up for branch strip subassembly 23 is the vertical state, as shown in fig. 6, the diameter of buffer 13 is greater than the through-hole diameter on dividing the sieve 20, so with buffer 13 top just to correspond branch sieve in 20 the through-hole back, it is fixed with the inner wall meshing of buffer 13 to rotate screw thread adjusting rod 24, until branch strip subassembly 23 expandes and be the petal form, as shown in fig. 5, thereby it is fixed to accomplish utilizing branch strip subassembly 23 to be connected of buffer 13 and branch sieve 20, the convenient disassembly equipment, use is nimble.

In order to reduce the later stage and get the material when the flying dust jets out, as shown in fig. 1 and fig. 3, feed opening 4 has been seted up to the top outer wall of screening case 1, and the bottom inner wall of screening case 1 is the slope form, one side outer wall of flexible cardboard 5 is fixed with rubber soft board 6 through the bolt, collect box 8 and be close to one side outer wall of dividing sieve 20 and seted up a plurality of feed inlets 11, collect box 8's opposite side outer wall and have a plurality of discharge gates 19 through hinged joint, the quantity of discharge gate 19 is the same with the quantity of feed inlet 11, and one side outer wall of collecting box 8 has a plurality of dust outlets 18 through the bolt fastening, and the equal joint in top of a plurality of dust outlets 18 has filter cover 17. When the material screening device is used, crushed materials produced in the crusher body 2 enter the screening box 1 through the feed opening 4 for screening, dust on the falling materials is prevented from returning to the crusher body 2 through the rubber soft plate 6 again, the materials are filtered through the multilayer screening plates 20 and slide down through the inner wall surfaces of the bottoms of the corresponding screening plates 20 and the screening box 1 and enter the collecting box 8 from the corresponding feed opening 11 for grading storage, the materials entering the collecting box 8 comprise a large amount of flying dust, and the dust is lifted through the dust outlet 18 and then is filtered by the filtering cover 17 to remove dust particles and then is discharged, so that the flying dust is prevented from being ejected in the later stage of material taking, a human body is prevented from being sucked, and finally the material with different specifications can be taken out by opening the discharge opening 19.

The working principle is as follows: during installation, the threaded adjusting rods 24 are adjusted to be pulled upwards, so that the branch bar assemblies 23 are in a vertical state, as shown in fig. 6, the diameters of the buffers 13 are larger than the diameters of the through holes in the sub-sieve plates 20, and after the top ends of the buffers 13 are opposite to the through holes in the corresponding sub-sieve plates 20, the threaded adjusting rods 24 are rotated to be meshed and fixed with the inner walls of the buffers 13 until the branch bar assemblies 23 are unfolded to be petal-shaped, as shown in fig. 5, and connection and fixation of the buffers 13 and the sub-sieve plates 20 by the branch bar assemblies 23 are completed. When the crusher is used, crushed materials produced in the crusher body 2 enter the screening box 1 through the feed opening 4 and then fall onto the top surface of the material collecting seat 14 to buffer the feed speed of the materials, so that the materials are prevented from falling onto the screening plates 20 at one time to cause damage of the screening plates 20 and cause incapability of use, the materials gradually slide down in sequence and enter the inclined screening plates 20 through the lower part of the telescopic clamping plate 5, dust on the materials prevented from sliding down by the rubber soft plates 6 returns to the crusher body 2 through the feed opening 4 again, the buffer 13 is pressed downwards, so that the screening plates 20 float up and down with the connection part of the screening plates 20 and the collecting box 8 as a base point, the materials on the multi-layer screening plates 20 with the pore diameters from large to small are screened layer by layer, when the materials fall on the uppermost screening plate 20, the screening plates 20 are weighted to compress the buffer 13 downwards, and the connecting arms 16 on the screening plates 20 move downwards, the pushing wheel disc 15 rotates clockwise, and through the synchronous transmission of the connecting arm 16 on the telescopic clamping plate 5, the telescopic clamping plate 5 moves downwards, so that the material on the collecting seat 14 is controlled to fall to the feeding amount on the top separating sieve plate 20, the blanking amount on the separating sieve plate 20 is kept consistent all the time, and the screening efficiency is prevented from being influenced by too much accumulated material on the separating sieve plate 20 at one time. The materials filtered and sieved by the multilayer sieving plates 20 slide downwards through the corresponding sieving plates 20 and the inner wall surface of the bottom of the sieving box 1, enter the collecting box 8 from the corresponding feed inlets 11 for classified storage, the materials entering the collecting box 8 comprise a large amount of flying dust, and when dust rises through the dust outlets 18, the dust particles are filtered by the filtering cover 17 and then the gas is discharged, so that the flying dust ejection during later material taking is reduced, the human body suction is caused, and finally the discharge outlets 19 are opened to take out the materials with different specifications.

Example 2

A jaw crusher having a multi-stage screening function, as shown in fig. 1, 2 and 4, in order to enhance the stability of a divided screen plate 20; the present embodiment is modified from embodiment 1 as follows: the inner wall of one side of the screening box 1 opposite to the screening box is provided with a plurality of sliding grooves, the inner wall of one side of each sliding groove is fixedly provided with a folding cover 10 through bolts, two sliding grooves in opposite positions are arranged into a group, and the inner wall of each group of sliding grooves is connected with the same supporting roll 9 through sliding blocks in a sliding manner; a plurality of connecting assemblies 7 are fixed on the bottom surfaces of the sub-sieve plates 20 through bolts, each connecting assembly 7 comprises a long plate and an arc-shaped plate, the outer wall of the bottom of each long plate is connected to the outer wall of the top of each arc-shaped plate through a hinge, a clamping groove 21 is formed in the outer wall of the bottom of each long plate, and an elastic clamping block 22 is fixed on the outer wall of the top of each arc-shaped plate through bolts; the outer wall of one side of the screening box 1 is connected with a box door 3 through a hinge. The long plate and the arc-shaped plate on the connecting and combining component 7 are opened, as shown in fig. 4, the sub-sieve plate 20 is sequentially arranged on the supporting roller 9 in the sliding grooves of the corresponding group, the elastic fixture blocks 22 on the arc-shaped plate are clamped into the clamping grooves 21 on the corresponding long plate, and the connecting and combining component 7 is installed, so that the supporting roller 9 and the sub-sieve plate 20 are fixedly connected. When dividing the sieve material, when dividing sieve plate 20 to receive heavy extrusion buffer 13 to descend downwards, drive backing roll 9 simultaneously and go up and down in the spout, folding cover 10 avoids in the dust gets into the spout, effectively avoids dividing sieve plate 20 to receive heavy by the cracked condition emergence of bending through backing roll 9, and the life of sieve plate 20 is divided in the extension, and the later stage is opened chamber door 3 and is convenient for take out the change with the structure that damages.

The working principle is as follows: during installation, the threaded adjusting rod 24 is adjusted to be pulled upwards, so that the branch rod assembly 23 is in a vertical state, as shown in fig. 6, the diameter of the buffer 13 is larger than the diameter of the through hole in the branch sieve plate 20, after the top end of the buffer 13 is just opposite to the through hole in the corresponding branch sieve plate 20, the threaded adjusting rod 24 is rotated to be meshed and fixed with the inner wall of the buffer 13 until the branch rod assembly 23 is unfolded to be in a petal shape, as shown in fig. 5, connection and fixation of the buffer 13 and the branch sieve plate 20 by using the branch rod assembly 23 are completed, then the long plate and the arc plate on the connecting assembly 7 are opened, as shown in fig. 4, the branch sieve plate 20 is sequentially placed on the supporting roller 9 in the corresponding group of sliding grooves, the elastic clamping block 22 on the arc plate is clamped into the clamping groove 21 on the corresponding long plate, installation of the connecting assembly 7 is completed, and the supporting roller 9 and the branch sieve plate 20 are connected and fixed. When the crusher is used, crushed materials produced in the crusher body 2 enter the screening box 1 through the feed opening 4 and then fall onto the top surface of the material collecting seat 14 to buffer the feed speed of the materials, so that the materials are prevented from falling onto the screening plate 20 at one time and being damaged and prevented from being used, the materials gradually slide down in sequence and enter the inclined screening plate 20 through the lower part of the telescopic clamping plate 5, dust on the materials prevented from sliding down by the rubber soft plate 6 returns to enter the crusher body 2 through the feed opening 4 again, the buffer 13 is pressed downwards, the screening plate 20 is enabled to float up and down with the joint of the screening plate and the collecting box 8 as a base point, the materials on the multi-layer screening plate 20 with the aperture from large to small are screened layer by layer, when the screening plate 20 is pressed downwards by the weight of the buffer 13, the supporting roller 9 is driven to lift in the chute, the folding cover 10 is prevented from dust entering the chute, the support rollers 9 effectively prevent the sub-sieve plates 20 from being bent and broken under heavy load. When the materials fall on the uppermost sub-sieve plate 20, the sub-sieve plate 20 is compressed downwards by the weight of the buffer 13, the connecting arms 16 on the sub-sieve plate 20 move downwards passively, the wheel disc 15 is pushed to rotate clockwise, and the telescopic clamp plate 5 moves downwards through synchronous transmission of the connecting arms 16 on the telescopic clamp plate 5, so that the feeding amount of the materials on the material collecting seat 14 falling on the top sub-sieve plate 20 is controlled, the falling amount on the sub-sieve plate 20 is kept consistent all the time, and the influence of excessive stacking of the materials on the sub-sieve plate 20 on the screening efficiency is avoided. The materials filtered and sieved by the multilayer sieving plate 20 slide downwards through the inner wall surfaces of the bottoms of the corresponding sieving plate 20 and the sieving box 1, enter the collecting box 8 from the corresponding feeding port 11 for classified storage, the materials entering the collecting box 8 comprise a large amount of fly ash, and when dust rises through the dust outlet 18, the dust particles are filtered by the filtering cover 17 and then the gas is discharged, so that the fly ash is prevented from being ejected when the materials are taken at the later stage, the human body is prevented from being sucked, finally, the discharging port 19 is opened to take out the materials with different specifications, and the box door 3 is opened at the later stage to facilitate the taking out and replacement of the damaged structural parts.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims (8)

1. A jaw crusher with a multi-stage screening function comprises a screening box (1) arranged on the outer wall of the bottom of a crusher body (2), and is characterized in that a telescopic clamping plate (5) is fixedly connected to the inner wall of the top of the screening box (1); the screening box is characterized in that a collecting seat (14) is fixedly connected to the inner wall of the bottom of the screening box (1), the top surface of the collecting seat (14) is inclined, a plurality of supporting seats (12) are fixedly connected to the outer wall of one side of the collecting seat (14), at least one buffer (13) is fixedly connected to the outer walls of the tops of the supporting seats (12), each buffer (13) comprises a rubber cylinder, a strong spring and an annular cylinder, a screening plate (20) is connected to the inner wall of each buffer (13) through a limiting structure, and each screening plate (20) is inclined; the inner wall of the bottom of the screening box (1) far away from the material collecting seat (14) is fixedly connected with a collecting box (8), and the outer wall of one side of the screening plate (20) is arranged on the outer wall of one side of the collecting box (8); the outer wall of the two sides of the material collecting seat (14) is provided with a wheel disc (15), one end of the wheel disc (15) is fixedly connected with a connecting block, the outer wall of the circumference of the connecting block is fixedly connected with two connecting arms (16) with different lengths, and the outer wall of one side of each of the two connecting arms (16) is connected with the outer wall of one side of the extending end of the telescopic clamping plate (5) and the outer wall of one side of one of the sub-sieve plates (20) through a fixing column.

2. The jaw crusher with the multi-stage screening function as claimed in claim 1, wherein the limiting structure comprises a supporting bar assembly (23), a threaded adjusting rod (24) and two connecting plates (25), the top end and the bottom end of the supporting bar assembly (23) are fixedly connected to the outer bottom wall and the outer top wall of the two connecting plates (25), respectively, the outer bottom wall of one of the connecting plates (25) is fixedly connected to the top end of the buffer (13), the outer top wall of the other connecting plate (25) is arranged on the outer bottom wall of the threaded adjusting rod (24), and the outer circumferential wall of the threaded adjusting rod (24) is arranged on the inner circumferential wall of the buffer (13).

3. The jaw crusher with multi-stage screening function as claimed in claim 2, characterized in that the outer wall of the top of the screening box (1) is provided with a feed opening (4), the inner wall of the bottom of the screening box (1) is inclined, and the outer wall of one side of the screening box (1) is provided with a box door (3).

4. The jaw crusher with multi-stage screening function as claimed in claim 3, wherein a rubber soft plate (6) is fixedly connected to the outer wall of one side of the telescopic clamping plate (5).

5. The jaw crusher with multi-stage screening function as claimed in claim 4, characterized in that the outer wall of one side of the collecting box (8) close to the screening plate (20) is provided with a plurality of feeding holes (11), the outer wall of the other side of the collecting box (8) is provided with a plurality of discharging holes (19), and the number of the discharging holes (19) is the same as that of the feeding holes (11).

6. The jaw crusher with multi-stage screening function as claimed in claim 5, characterized in that a plurality of dust outlets (18) are fixedly connected to the outer wall of one side of the collecting box (8), and a filtering cover (17) is arranged at the top end of each dust outlet (18).

7. The jaw crusher with multi-stage screening function according to claim 1, wherein the inner wall of the screening box (1) on the opposite side is provided with a plurality of sliding grooves, the inner wall of one side of the sliding grooves is fixedly connected with a folding cover (10), two sliding grooves are arranged in a group at opposite positions, and the inner wall of each group of sliding grooves is provided with the same supporting roll (9).

8. The jaw crusher with the multi-stage screening function as claimed in claim 7, wherein a plurality of connecting assemblies (7) are fixedly connected to the bottom surfaces of the plurality of sub-screening plates (20), each connecting assembly (7) comprises a long plate and an arc-shaped plate, the bottom outer wall of the long plate is arranged on the top outer wall of the arc-shaped plate, a clamping groove (21) is formed in the bottom outer wall of the long plate, and an elastic clamping block (22) is fixedly connected to the top outer wall of the arc-shaped plate.

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