CN116550414A - Coal mining crushing device and crushing method thereof - Google Patents

Abstract

The utility model discloses a coal mining crushing device and a crushing method thereof, and relates to the technical field of coal mining, wherein the crushing device comprises a bottom box, a pair of first roll shafts are arranged at the top in the bottom box, a pair of crushing rollers are sleeved on the middle section part of the pair of first roll shafts, and a plurality of crushing teeth are sleeved on the pair of crushing rollers; the bottom is equipped with four second roller in the base box, and the middle section part of every second roller all overlaps and is equipped with the grinding roller, is equipped with first sieve under the open bottom surface of base box, and a plurality of first sieve meshes have been seted up to the inner bottom wall of first sieve, are equipped with the second sieve under the first sieve, and a plurality of second sieve meshes have been seted up to the inner bottom wall of second sieve, and first sieve passes through vibrating screen mechanism and is connected with the second sieve. The utility model not only improves the crushing effect of coal, but also improves the crushing efficiency of coal and further improves the screening effect after coal crushing.

Description

Coal mining crushing device and crushing method thereof

technical field

The invention relates to the technical field of coal mining, in particular to a coal mining crushing device and a crushing method thereof.

Background technique

A Chinese utility model discloses a coal mine crushing device for coal mine development (publication number: CN216879571U), which includes a crushing cavity, a feeding part, a crushing roller, a crushing drive linkage part, a reaction top block and a vibrating screening assembly. Set on the side wall of the crushing chamber, the reaction top block is arranged in a right-angled triangle structure and attached to the top wall of the crushing chamber. It is arranged on the inner side wall of the crushing chamber, the crushing driving linkage is arranged on the crushing chamber and connected with two sets of crushing rollers, and the vibrating screening assembly is arranged in the crushing chamber and below the crushing rollers.

The current crushing device has the following problems: 1. The crushing device mostly uses two sets of crushing rollers to rotate to crush the coal block. Only two sets of crushing rollers cannot guarantee the effect of coal crushing, and it is not convenient to crush medium-sized coal, and the crushing effect is not ideal; 2. After the coal mine is crushed, there are still large and medium-sized coal particles, which lack effective screening effect, and the machine still needs to be used to screen them again, resulting in low screening efficiency.

Contents of the invention

The purpose of the present invention is to solve the disadvantages of poor coal crushing effect and screening effect after coal mining in the prior art, and propose a coal mining crushing device and crushing method thereof.

In order to solve the problem of poor coal crushing effect and screening effect after coal mining in the prior art, the present invention adopts the following technical solutions:

A coal mine mining and crushing device, comprising a bottom box, the bottom box is a rectangular box with an open bottom surface, the middle part of the top surface of the bottom box is provided with an inverted trapezoidal feeding hopper penetrating and fixed, the bottom box Four symmetrically distributed L-shaped outriggers are fixed on the two side walls; a pair of first roller shafts placed in parallel in the longitudinal direction are arranged on the top of the bottom box, and the front and rear ends of the pair of first roller shafts are rotated through The inner side wall of the bottom box extends to the outer side, a pair of concentric and fixed crushing rollers are set on the middle part of the pair of first roller shafts, and a number of opposing and staggered crushing rollers are set on the pair of crushing rollers. tooth;

The inner bottom of the bottom box is provided with four second roller shafts placed in parallel longitudinally, and the front and rear ends of each of the second roller shafts rotate through the inner wall of the bottom box and extend to the outside, and each of the second roller shafts The middle section of the roller shaft is equipped with concentrically fixed grinding rollers, and a pair of oblique baffles are fixed on the two side walls of the bottom box, and the bottom edges of the pair of oblique baffles are respectively located close to The top edge of the grinding roller;

A first sieve plate suspended in the air is provided directly below the opening of the bottom surface of the bottom box. The inner bottom wall of the first sieve plate is provided with a number of equidistantly distributed first sieve holes. A second sieve plate placed in parallel is provided, and the inner bottom wall of the second sieve plate is provided with a number of second sieve holes distributed equidistantly. The inner diameter of the first sieve hole is larger than the inner diameter of the second sieve hole. One sieve plate is connected with the second sieve plate through a vibrating sieve mechanism.

Preferably, one side of the top surface of the bottom box is fixed with a single-axis motor with the output end facing forward, and the end of the motor shaft of the single-axis motor is sleeved with a concentrically fixed first sprocket wheel. The front end of the first roller shaft is sheathed with a concentrically fixed linkage sprocket, and the first sprocket is in meshing transmission connection with one of the linkage sprockets through a first chain belt.

Preferably, a fixed shaft that is rotationally connected is inserted in the middle of the front of the bottom box, and a second sprocket that is concentrically fixed is sheathed in the middle of the fixed shaft, and the second sprocket is connected to it through a second chain belt. The other interlocking sprocket is engaged in transmission connection, and the front end of the fixed shaft is covered with a concentric fixed disk.

Preferably, the rear ends of the pair of first rollers are sheathed with a pair of concentric fixed gears, and the pair of fixed gears are meshed with each other;

The front end of each of the second roller shafts is sleeved with concentrically fixed linkage gears, and a pair of adjacent linkage gears are meshed and connected with each other.

Preferably, a pair of symmetrically distributed limiting blocks are fixed on the bottom of both sides of the front of the bottom box, and a pair of vertically engaging and slidingly connected limiting racks are provided on the opposite surfaces of the pair of limiting blocks. , a pair of limit racks are meshed with an adjacent linkage gear.

Preferably, the top ends of a pair of limit racks are provided with a horizontally fixed connection plate, an oval pin hole is opened in the middle of the connection plate, and an eccentric fixed plate is provided on the front side of the fixed plate. Pin shaft, the outer end of the eccentric pin shaft is engaged in the oval pin hole for sliding connection.

Preferably, four first connecting blocks are fixed at the four corners of the bottom surface of the bottom box, and four symmetrically distributed second connecting blocks are arranged on both sides of the first sieve plate, each of the first A vertical vibrating plate is arranged between the connecting block and the corresponding second connecting block.

Preferably, two pairs of symmetrically distributed third connecting blocks are provided in the middle of both sides of the first sieve plate, and two pairs of symmetrically distributed fourth connecting blocks are provided in the middle of the two sides of the second sieve plate. The third connecting block and two pairs of fourth connecting blocks are arranged in a staggered manner, and an oblique vibrating plate is arranged between each third connecting block and the corresponding fourth connecting block.

Preferably, the vibrating sieve mechanism includes a crank and a connecting rod, a pair of symmetrically distributed positioning shafts are fixed on the front ends of both sides of the second sieve plate, and a transversely placed shaft is fixed on the rear side of the bottom surface of the first sieve plate. Biaxial motor, the two motor shaft ends of the biaxial motor all extend to the outside of the first sieve plate, and the two motor shaft ends of the biaxial motor are fixed with cranks, and each crank The outer ends of each are provided with movable hinged connecting rods, and the front end of each said connecting rod is movable hinged with the outer end of the corresponding positioning shaft.

The present invention also proposes a crushing method of a coal mining crushing device, comprising the following steps:

Step 1, start the single-axis motor, the motor shaft of the single-axis motor drives the first sprocket to rotate synchronously, and the first sprocket drives the corresponding linkage sprocket on one side, the first roller shaft, the crushing roller, several The crushing gear and the fixed gear rotate synchronously, and the meshing effect of a pair of fixed gears drives the corresponding fixed gear, crushing roller, several crushing teeth, the first roller shaft and the linkage sprocket to rotate synchronously and reversely on the other side;

Step 2, another linkage sprocket drives the second sprocket, the fixed shaft, the fixed disc and the eccentric pin shaft to rotate synchronously and reversely through the second chain belt, and the eccentric pin shaft and the elliptical pin hole on the connecting plate form a limiting effect, driving The connecting plate and a pair of limit racks reciprocate up and down along a pair of limit blocks, and the meshing of a pair of limit racks drives the four linkage gears to reciprocate forward and reverse in sequence, and then drives the second roller and the grinding machine. The roller reciprocates forward and reverse;

Step 3, start the double-axis motor, the two motor shafts of the double-axis motor drive a pair of cranks to rotate synchronously, and then drive the second sieve plate and four oblique vibration plates through the hinge action of a pair of connecting rods and a pair of positioning shafts Perform reciprocating vibration, and then drive the first sieve plate and four vertical vibration plates to reciprocate;

Step 4: Pour the mined coal into the bottom box through the feed hopper. As a pair of crushing rollers rotate in opposite directions, the coal is initially crushed through a number of crushing teeth. After the coal is crushed, it passes through the inclined baffle Drop between the four grinding rollers, and then grind through the adjacent grinding rollers to grind the crushed coal;

Step 5, the ground coal falls onto the first sieve plate, and under the vibration of the first sieve plate, the coal is initially sieved through the first sieve holes, and the large particles of coal remain on the first sieve plate. The coal after preliminary screening falls to the second sieve plate, and under the vibration of the second sieve plate, the coal is screened again through the second sieve hole, and the medium-sized coal remains on the second sieve plate.

Compared with prior art, the beneficial effect of the present invention is:

1. In the present invention, through a pair of crushing rollers rotating in opposite directions, a number of crushing teeth carry out preliminary crushing operations on coal, and through the forward and reverse reciprocating rotation of the grinding rollers, the grinding rollers perform re-grinding operations on the coal mine, not only Improve the crushing effect of coal, and also improve the efficiency of coal crushing;

2. In the present invention, through the reciprocating vibration of the first sieve plate and the second sieve plate, under the vibration of the first sieve plate, the coal is initially screened through the first sieve holes, and the vibration of the second sieve plate Under the action, the coal is screened again through the second sieve hole, thereby improving the screening effect of the coal after crushing;

In summary, the present invention solves the problem of poor coal crushing effect and screening effect after coal mining, and the overall structure design is compact, which not only improves the crushing effect of coal, but also improves the efficiency of coal crushing, and further improves the efficiency of coal crushing. Screening effect after crushing.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the front view structure schematic diagram of the present invention;

Fig. 2 is the rear view structure schematic diagram of the present invention;

Fig. 3 is a schematic cutaway view of the front view structure of the present invention;

Fig. 4 is a schematic diagram of the internal structure of the present invention;

Fig. 5 is a schematic diagram of the connection between a pair of crushing rollers and four grinding rollers of the present invention;

FIG. 6 is a schematic diagram of another perspective of FIG. 5 of the present invention;

Fig. 7 is a schematic diagram of the connection between the first sieve plate and the second sieve plate of the present invention;

FIG. 8 is a schematic diagram of another perspective of FIG. 7 of the present invention;

Serial numbers in the figure: 1. Bottom box; 11. Crushing roller; 12. Crushing teeth; 13. Fixed gear; 14. Single-axis motor; 15. First chain belt; 16. Second chain belt; 2. Grinding roller ; 21, linkage gear; 22, fixed plate; 23, connecting plate; 24, eccentric pin; 25, limit block; 26, limit rack; 3, the first sieve plate; 31, the second sieve plate; 32, vertical vibrating plate; 33, oblique vibrating plate; 34, positioning shaft; 35, biaxial motor; 36, crank; 37, connecting rod.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

Embodiment 1: This embodiment provides a coal mining crushing device, see Figure 1-8, specifically, it includes a bottom box 1, the bottom box 1 is a rectangular box with an open bottom, and the middle part of the top surface of the bottom box 1 is set There is a feed hopper in the shape of an inverted ladder connected through and fixed, and four symmetrically distributed L-shaped outriggers are fixed on the two side walls of the bottom box 1; a pair of first roller shafts placed longitudinally and parallel are arranged on the top of the bottom box 1, and one The front and rear ends of the first roller shafts rotate through the inner wall of the bottom box 1 and extend to the outside. The middle part of the pair of first roller shafts is sleeved with a pair of concentrically fixed crushing rollers 11, a pair of crushing rollers 11 is provided with a number of crushing teeth 12 that are distributed in opposite directions and staggered;

The inner bottom of the bottom box 1 is provided with four second rollers placed in parallel longitudinally, the front and rear ends of each second roller rotate through the inner wall of the bottom box 1 and extend to the outside, the middle section of each second roller Some parts are equipped with concentrically fixed grinding rollers 2, and a pair of oblique baffles are fixed on the two side walls of the bottom box 1. top edge;

A first sieve plate 3 suspended in the air is provided directly below the opening of the bottom surface of the bottom box 1. The inner bottom wall of the first sieve plate 3 is provided with a number of equidistantly distributed first sieve holes. The second sieve plate 31 placed in parallel, the inner bottom wall of the second sieve plate 31 is provided with a number of equidistant second sieve holes, the inner diameter of the first sieve hole is larger than the inner diameter of the second sieve hole, the first sieve plate 3 passes The sieve mechanism is connected with the second sieve plate 31 .

In the specific implementation process, as shown in Figure 5, the top side of the bottom box 1 is fixed with a single-axis motor 14 with the output end facing forward, and the end of the motor shaft of the single-axis motor 14 is provided with a concentric fixed first A sprocket, the front end of a pair of first roller shafts is covered with a concentrically fixed linkage sprocket, the first sprocket is meshed with one of the linkage sprockets through the first chain belt 15; the single shaft motor 14 The motor shaft drives the first sprocket to rotate synchronously, and the first sprocket drives the corresponding linkage sprocket on one side, the first roller shaft, the crushing roller 11, several crushing teeth 12, and the fixed gear 13 to rotate synchronously through the first chain belt 15;

The middle part of the front of the bottom box 1 is inserted with a fixed shaft connected by rotation, and the middle part of the fixed shaft is set with a second sprocket concentrically fixed, and the second sprocket meshes with the other linkage sprocket through the second chain belt 16 Transmission connection, the front end of the fixed shaft is covered with a concentric fixed fixed disc 22; the other linkage sprocket drives the second sprocket, fixed shaft, fixed disc 22 and eccentric pin shaft 24 through the second chain belt 16 to reverse synchronously turn.

It should be noted that in this embodiment, four first connecting blocks are fixed at the four corners of the bottom surface of the bottom box 1, and four symmetrically distributed second connecting blocks are provided on both sides of the first sieve plate 3, A vertical vibrating plate 32 is provided between each first connecting block and the corresponding second connecting block; the vertical vibrating plate 32 has a certain degree of elasticity, and when the first sieve plate 3 vibrates, it can drive four vertical vibrating plates. The vibrating plate 32 vibrates synchronously;

The middle part of both sides of the first sieve plate 3 is provided with two pairs of symmetrically distributed third connecting blocks, and the middle part of the two sides of the second sieve plate 31 is provided with two pairs of symmetrically distributed fourth connecting blocks. The fourth connecting block is arranged in a staggered manner, and an oblique vibrating plate 33 is provided between each third connecting block and the corresponding fourth connecting block; the oblique vibrating plate 33 has certain elasticity, and when the second sieve plate 31 When vibrating, it can drive four oblique vibrating plates 33 to vibrate synchronously.

Embodiment 2: In Embodiment 1, there is also the problem of inconvenient rotation of the crushing roller 11 and the grinding roller 2. Therefore, on the basis of Embodiment 1, this embodiment also includes:

In the specific implementation process, as shown in Figure 5, the rear ends of a pair of first roller shafts are sheathed with a pair of concentrically fixed fixed gears 13, and a pair of fixed gears 13 are meshed with each other; the meshing of a pair of fixed gears 13 function, drive the corresponding fixed gear 13, crushing roller 11, several crushing teeth 12, the first roller shaft and the linkage sprocket on the other side to rotate synchronously and reversely;

The front end of each second roller shaft is equipped with a concentrically fixed linkage gear 21, and a pair of adjacent linkage gears 21 are meshed with each other; a pair of limit racks 26 mesh to drive the four linkage gears 21 sequentially. Forward and reverse reciprocating rotation, and then drive the second roller shaft and grinding roller 2 to perform forward and reverse reciprocating rotation.

Embodiment 3: In Embodiment 2, there is still a problem that a pair of limiting racks 26 cannot reciprocate and slide. Therefore, on the basis of Embodiment 2, this embodiment also includes:

In the specific implementation process, as shown in Figure 5, a pair of symmetrically distributed limit blocks 25 are fixed on the bottom of both sides of the front of the bottom box 1, and a pair of vertical locking blocks are provided on the opposite surfaces of the pair of limit blocks 25. And the limit rack 26 that is slidingly connected, a pair of limit racks 26 are all meshed with an adjacent linkage gear 21;

The top end of a pair of spacer racks 26 is provided with the connecting plate 23 that is fixed horizontally, and the middle part of connecting plate 23 is provided with oval pin hole, and the front side of fixed plate 22 is provided with the eccentric pin shaft 24 that eccentrically affixes, eccentric The outer end of the pin shaft 24 is engaged in the oval pin hole for sliding connection;

The eccentric pin shaft 24 and the oval pin hole on the connecting plate 23 form a limiting effect, and drive the connecting plate 23 and a pair of limiting racks 26 to reciprocate and slide up and down along a pair of limiting blocks 25 .

Embodiment 4: In Embodiment 1, there is also the problem that the screening effect of the first sieve plate 3 and the second sieve plate 31 is not good. Therefore, on the basis of Embodiment 1, this embodiment also includes:

In the specific implementation process, as shown in Figure 7 and Figure 8, the vibrating screen mechanism includes a crank 36, a connecting rod 37, a pair of symmetrically distributed positioning shafts 34 are fixed on the front ends of the two sides of the second sieve plate 31, and the first sieve plate The rear side of the bottom surface of 3 is fixed with a horizontally placed biaxial motor 35, and the two motor shaft ends of the biaxial motor 35 all extend to the outside of the first sieve plate 3, and the two motor shaft ends of the biaxial motor 35 All are fixed with cranks 36, and the outer end of each crank 36 is provided with a movable hinged connecting rod 37, and the front end of each connecting rod 37 is movable hinged with the outer end of the corresponding positioning shaft 34;

The two motor shafts of the double-axis motor 35 drive a pair of cranks 36 to rotate synchronously, and then through the hinge action of a pair of connecting rods 37 and a pair of positioning shafts 34, drive the second sieve plate 31 and four oblique vibration plates 33 to reciprocate Vibration, and then drives the first sieve plate 3 and the four vertical vibration plates 32 to reciprocate and vibrate.

Embodiment five: specifically, working principle of the present invention and operation method are as follows:

Step 1, start the single-axis motor 14, the motor shaft of the single-axis motor 14 drives the first sprocket to rotate synchronously, and the first sprocket drives the corresponding linkage sprocket, the first roller shaft, and the crushing roller on one side through the first chain belt 15 Cylinder 11, several crushing teeth 12, and fixed gear 13 rotate synchronously, and the meshing effect of a pair of fixed gears 13 drives the corresponding fixed gear 13, crushing roller 11, several crushing teeth 12, first roller shaft and linkage chain on the other side The wheels rotate in reverse synchronously;

Step 2, another linkage sprocket drives the second sprocket, the fixed shaft, the fixed disk 22 and the eccentric pin shaft 24 to rotate synchronously and reversely through the second chain belt 16, and the eccentric pin shaft 24 and the elliptical pin hole on the connecting plate 23 form a The limit function drives the connecting plate 23 and a pair of limit racks 26 to reciprocate up and down along a pair of limit blocks 25, and the pair of limit racks 26 meshes to drive the four linkage gears 21 to reciprocate forward and reverse in turn Rotate, and then drive the second roller shaft and grinding roller 2 to reciprocate forward and reverse;

Step 3, start the biaxial motor 35, the two motor shafts of the biaxial motor 35 drive a pair of cranks 36 to rotate synchronously, and then drive the second sieve plate 31 and The four oblique vibrating plates 33 perform reciprocating vibration, and then drive the first sieve plate 3 and the four vertical vibrating plates 32 to reciprocate and vibrate;

Step 4: Pour the mined coal into the bottom box 1 through the feed hopper. Since a pair of crushing rollers 11 rotate in opposite directions, the coal is initially crushed through a number of crushing teeth 12. After the coal is crushed, it is Fall to the baffle plate between the four grinding rollers 2, and then grind between the adjacent grinding rollers 2 to grind the crushed coal;

Step 5, the ground coal falls onto the first sieve plate 3, under the vibration of the first sieve plate 3, the coal is preliminarily screened through the first sieve holes, and the large particle coal remains on the first sieve plate 3, the initially screened coal falls onto the second sieve plate 31, and under the vibration of the second sieve plate 31, the coal is screened again through the second sieve hole, and the medium-sized coal remains on the second sieve plate. plate 31.

The invention solves the problem of poor coal crushing effect and screening effect after coal mining, and the overall structure design is compact, which not only improves the coal crushing effect, but also improves the efficiency of coal crushing, and further improves the screening of coal after crushing Effect.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (9)

1. A coal mine mining crushing device, comprising a bottom box (1), characterized in that: the bottom box (1) is a rectangular box with an open bottom, and the middle part of the top surface of the bottom box (1) is provided with a through A fixed inverted ladder-shaped feed hopper, the two side walls of the bottom box (1) are fixed with four symmetrically distributed L-shaped legs; the top of the bottom box (1) is provided with a pair of longitudinally parallel The first roller shaft, the front and rear ends of the pair of first roller shafts all rotate through the inner wall of the bottom box (1) and extend to the outside, and the middle section of the pair of first roller shafts is sleeved with a pair of concentric fixed connected crushing rollers (11), a pair of said crushing rollers (11) are provided with a number of crushing teeth (12) that are oppositely distributed in a staggered manner; The inner bottom of the bottom box (1) is provided with four second rollers placed longitudinally in parallel, and the front and rear ends of each of the second rollers rotate through the inner wall of the bottom box (1) and extend to the outside. The middle section of each of the second roller shafts is provided with a concentrically fixed grinding roller (2), and a pair of oblique baffles are fixed on the inner side walls of the bottom box (1). The bottom edges of the inclined baffles are respectively close to the top edges of the grinding rollers (2) on both sides; A first sieve plate (3) suspended in the air is provided directly below the opening of the bottom surface of the bottom box (1), and the inner bottom wall of the first sieve plate (3) is provided with a plurality of equidistant first sieve holes, The second sieve plate (31) placed in parallel is provided directly below the first sieve plate (3), and the inner bottom wall of the second sieve plate (31) is provided with a plurality of equidistantly distributed second sieve holes. The inner diameter of the first sieve hole is larger than the inner diameter of the second sieve hole, and the first sieve plate (3) is connected with the second sieve plate (31) through a vibrating sieve mechanism. 2. A coal mining crushing device according to claim 1, characterized in that: a single-axis motor (14) with the output end facing forward is fixed on one side of the top surface of the bottom box (1), and the single-axis motor (14) The motor shaft end of the shaft motor (14) is covered with a concentrically fixed first sprocket, and the front ends of a pair of said first roller shafts are covered with a concentrically fixedly connected linkage sprocket, and said first sprocket Carry out meshing transmission connection with one of the linkage sprockets through the first chain belt (15). 3. A coal mining crushing device according to claim 2, characterized in that: a fixed shaft connected by rotation is inserted in the middle of the front of the bottom box (1), and a concentric fixed shaft is sleeved in the middle of the fixed shaft. The second sprocket is connected, and the second sprocket is meshed with the other linkage sprocket through the second chain belt (16), and the front end of the fixed shaft is sleeved with a concentric fixed disk ( twenty two). 4. A coal mining crushing device according to claim 3, characterized in that: a pair of concentrically fixed fixed gears (13) are sleeved on the rear ends of a pair of said first roller shafts, and a pair of said first rollers The fixed gears (13) are meshed with each other; The front end of each second roller shaft is sheathed with concentrically fixed linkage gears (21), and a pair of adjacent linkage gears (21) are meshed and connected to each other. 5. A coal mining crushing device according to claim 4, characterized in that: the bottom of the bottom box (1) on both sides of the front is fixed with a pair of symmetrically distributed limit blocks (25), a pair of A pair of vertically engaged and slidingly connected spacer racks (26) are provided on the opposite surface of the spacer block (25), and a pair of spacer bar bars (26) are all connected to an adjacent linkage gear ( 21) Intermeshing connection. 6. A coal mine mining and crushing device according to claim 5, characterized in that: a pair of said limit racks (26) are provided with a horizontally fixed connection plate (23) at the top end thereof, and said connection plate The middle part of (23) is provided with oval pin hole, and the front side of described fixed plate (22) is provided with the eccentric pin shaft (24) of eccentric affixation, and the outer end of described eccentric pin shaft (24) snaps on Sliding connections in oval pin holes. 7. A coal mining crushing device according to claim 6, characterized in that four first connecting blocks are fixed at the four corners of the bottom surface of the bottom box (1), and the first sieve plate ( 3) There are four symmetrically distributed second connecting blocks on both sides, and a vertical vibrating plate (32) is provided between each first connecting block and the corresponding second connecting block. 8. A coal mining crushing device according to claim 7, characterized in that: two pairs of symmetrically distributed third connecting blocks are arranged in the middle of both sides of the first sieve plate (3), and the second sieve plate (3) Two pairs of symmetrically distributed fourth connecting blocks are arranged in the middle of both sides of the plate (31). Oblique vibrating plates (33) are arranged between the fourth connecting blocks. 9. The crushing method of a coal mining crushing device according to claim 8, characterized in that, comprising the following steps: Step 1, start the single-axis motor (14), the motor shaft of the single-axis motor (14) drives the first sprocket to rotate synchronously, and the first sprocket drives the corresponding linkage sprocket on one side, the second sprocket through the first chain belt (15) A roller shaft, a crushing roller (11), a number of crushing teeth (12), and a fixed gear (13) rotate synchronously, and the meshing action of a pair of fixed gears (13) drives the corresponding fixed gear (13) on the other side, crushing The roller (11), several crushing teeth (12), the first roller shaft and the linkage sprocket rotate in reverse synchronously; Step 2, another linkage sprocket drives the second sprocket, fixed shaft, fixed disc (22) and eccentric pin shaft (24) to rotate in reverse synchronously through the second chain belt (16), and the eccentric pin shaft (24) is connected with the The ellipse pin holes on the plate (23) form a limiting effect, which drives the connecting plate (23) and a pair of limiting racks (26) to reciprocate up and down along a pair of limiting blocks (25). The meshing of the rack (26) drives the four linkage gears (21) to reciprocate forward and reverse in turn, and then drives the second roller shaft and the grinding roller (2) to reciprocate forward and reverse; Step 3, start the biaxial motor (35), the two motor shafts of the biaxial motor (35) drive a pair of cranks (36) to rotate synchronously, and then pass through a pair of connecting rods (37) and a pair of positioning shafts (34) The hinge function drives the second sieve plate (31) and the four oblique vibrating plates (33) to reciprocate and vibrate, and then drives the first sieve plate (3) and the four vertical vibrating plates (32) to reciprocate and vibrate; Step 4: Pour the mined coal into the bottom box (1) through the feed hopper. Since the pair of crushing rollers (11) rotate in opposite directions, the coal is initially crushed by a number of crushing teeth (12). , after the coal is broken, it falls between the four grinding rollers (2) through the inclined baffle, and then grinds between the adjacent grinding rollers (2), so as to grind the crushed coal; Step 5, the ground coal falls onto the first sieve plate (3), under the vibration of the first sieve plate (3), the coal is initially screened through the first sieve hole, and the large particle coal remains on the first sieve plate (3). On the first sieve plate (3), the initially screened coal falls onto the second sieve plate (31), and under the vibration of the second sieve plate (31), the coal is screened again through the second sieve hole points, medium particle coal remains on the second sieve plate (31).