Cobalt carbonate raw material crushing device

Abstract

The cobalt carbonate raw material crushing device applied to the field of cobalt carbonate production comprises a crushing box and a plurality of crushing rollers, a driving mechanism, a first dust suction device and a second dust suction device are installed on the outer wall of the crushing box, a plurality of dust suction holes are evenly formed in the crushing rollers, and dust suction pipes are arranged on the inner sides of the crushing rollers; a plurality of dust suction through holes are uniformly formed in the dust suction pipe, dust suction holes are formed in the crushing roller, dust near the crushing roller is sucked and removed through the first dust suction device, the dust suction pressure on the top of the crushing box is reduced, meanwhile, dust suction and removal can be more thorough, and the later dust cleaning burden is further reduced; the two-way dust suction effect is achieved through cooperation with the second dust suction device, and the dust suction effect is better; and through the dredging mechanism arranged on the inner side of the crushing roller, the dust collection holes can be dredged in the process that the crushing roller rotates around the axis of the crushing roller to crush the cobalt carbonate raw material, and the stable dust collection effect of the dust collection holes is guaranteed.

Description

Technical Field

[0001] The invention relates to a crushing device, in particular to a cobalt carbonate raw material crushing device applied to the field of cobalt carbonate production. Background Art

[0002] Cobalt carbonate is an inorganic compound with the chemical formula CoCO3. It is a pink crystalline powder that is almost insoluble in water, alcohol, methyl ether and ammonia. It is mainly used as a mineral processing agent, catalyst, pigment for camouflage coatings, feed, trace fertilizer, ceramics and raw material for the production of cobalt oxide. Raw material crushing is one of the processes for cobalt carbonate processing to ensure that cobalt carbonate with uniform particle size is obtained.

[0003] However, cobalt carbonate is toxic and irritating to the eyes, respiratory system and skin, so the dust generated during the crushing process needs to be sucked away.

[0004] For example, the patent publication number CN220238785U discloses a multi-stage comb-tooth crusher, which includes a body and a door, a support seat is installed at the lower end of the body, the door is arranged on the surface of the body, and a crushing component 1 for multi-stage crushing is arranged on the right side of the body, and the crushing component 1 includes a support plate, a motor, a rotating rod, a crushing blade and a wear-resistant baffle. When the crushing component 1 and the crushing component 2 crush the building ceramic raw materials, the multi-stage comb-tooth crusher connection assembly can generate a force through the air pump to transmit it along the dust suction pipe to the dust suction part, so that the dust suction part can transport the dust generated during the dust crushing to the dust storage box.

[0005] Based on the above search and in combination with the prior art, it is found that the crushing devices similar to the above disclosure in the prior art generally have a dust suction structure inside the box body away from the crushing structure. When there is a lot of dust, the dust is difficult to be sucked away in time, resulting in poor dust removal effect. Therefore, a cobalt carbonate raw material crushing device is proposed to improve the above problem. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the crushing device in the prior art generally has a dust suction structure arranged inside the box body away from the crushing structure. When there is a lot of dust, the dust is difficult to be sucked away in time, resulting in poor dust removal effect.

[0007] In order to solve the above problems, the present invention provides a cobalt carbonate raw material crushing device, comprising a crushing box, and a plurality of crushing rollers installed horizontally and parallel to the inner side of the crushing box, and a driving mechanism for driving the plurality of crushing rollers to rotate is installed on one side outer wall of the crushing box: A first dust suction device is installed on one side outer wall of the crushing box, a plurality of dust suction holes are evenly arranged on the crushing roller, a dust suction pipe is evenly arranged on the inner side of the crushing roller, a plurality of dust suction through holes are evenly arranged on the dust suction pipe, the dust suction pipe is coaxially arranged with the crushing roller, one end of the dust suction pipe passes through the crushing box, and is connected to the first dust suction device through a pipeline; A dredging mechanism is arranged on the inner side of the crushing roller, and the dust suction holes are dredged when the crushing roller rotates around its axis; A second dust suction device is installed on one side outer wall of the crushing box, and a dust suction end of the second dust suction device extends to the upper port of the crushing box.

[0008] In the above-mentioned cobalt carbonate raw material crushing device, based on the fact that the position where dust is generated during crushing is often located at the position where crushing occurs, that is, close to the crushing roller, a dust suction hole is arranged on the crushing roller, and the first dust suction device is used to suction the dust near the crushing roller, thereby reducing the dust suction pressure on the top of the crushing box, and at the same time making the dust suction more thorough, further reducing the burden of dust cleaning in the later stage, and cooperating with the second dust suction device to achieve a two-way dust suction effect, the dust suction effect is better; and through the dredging mechanism arranged on the inner side of the crushing roller, the dust suction holes can be dredged in the process of the crushing roller rotating around its axis to crush the cobalt carbonate raw material, thereby ensuring the stable dust suction effect of the dust suction holes.

[0009] As a further supplement to the present application, the dredging mechanism includes a plurality of dredging components, and the plurality of dredging components are evenly distributed along the circumference of the inner side wall of the crushing roller; The dredging assembly comprises a movable plate, a dredging needle and an elastic reset member 1, the length direction of the movable plate is consistent with the axis direction of the crushing roller, and both ends of the movable plate are fixed to the inner wall of the crushing roller through the elastic reset member 1; A plurality of dredging needles are provided, and the plurality of dredging needles are fixed equidistantly along the length direction of the movable plate, and the plurality of dredging needles are arranged one by one correspondingly to the plurality of dust suction holes; Cams are fixed at positions near both ends of the crushing roller. When the crushing roller rotates around its axis to crush the cobalt carbonate raw material, the movable plate rotates synchronously with the crushing roller with the unclogging needle. When the movable plate rotates to contact the cam, the movable plate squeezes the elastic reset member 1 under the obstruction of the cam, so that the unclogging needle is inserted into the dust suction hole. When the movable plate rotates to separate from the cam, the movable plate, under the action of the elastic reset member 1, takes the unclogging needle out of the dust suction hole, thereby unclogging the dust suction hole. For each rotation of the crushing roller, the dust suction hole is only unclogged once by the unclogging needle, which can ensure both timely unclogging of the dust suction hole and stable dust suction of the dust suction hole.

[0010] As a further supplement to the present application, the unclogging assembly also includes a limiting slide rod, two limiting slide rods are provided, the two limiting slide rods are respectively fixed at the two end positions of the crushing roller, and are arranged perpendicular to the axis of the crushing roller, and slide through the movable plate; the limiting slide rod can ensure that the unclogging needle can be accurately inserted into the dust suction hole.

[0011] As a further supplement to the present application, a plurality of crushing teeth are evenly and integrally arranged on the outer wall of the crushing roller, and the driving mechanism includes a driving box, a driving motor and a transmission assembly. The driving box is fixed on the outer wall of the crushing box, the driving motor is installed on the inner side of the driving box, and the transmission assembly is installed between the output end of the driving motor and the crushing roller.

[0012] As a further supplement to the present application, the transmission assembly includes a main gear and a plurality of outer gear rings, the main gear is coaxially fixed to the output end of the driving motor, and the plurality of outer gear rings are coaxially fixed to the ends of the plurality of crushing rollers in a one-to-one correspondence and meshed with each other, and the main gear is meshed with one of the outer gear rings; A mounting frame fixed to the other end of the dust suction pipe is also arranged on the inner side of the driving box, and the mounting frame is fixed to the outer wall of the crushing box.

[0013] As a further supplement to the present application, a dustproof plate is symmetrically hinged at the upper port of the crushing box. The dustproof plate is hollow, and the lower end surface of the dustproof plate is densely covered with small holes connected to the inner side of the dustproof plate. The dust suction end of the second dust suction device is connected to the inner side of the dustproof plate through a hose; the dustproof plate can be used to prevent dust and can also remove dust over a large area, so that the dust removal effect is better.

[0014] As a further supplement to the present application, a second elastic reset member is fixedly connected between the lower end of the dustproof plate and the inner wall of the crushing box, so that the dustproof plate can be automatically closed under the action of the second elastic reset member.

[0015] As a further supplement to the present application, a deflector is provided on the upper side of the hinged end of the dust plate, and the deflector is fixed to the inner wall of the crushing box; The upper end surface of the dustproof plate located directly below the air guide hood is densely covered with small holes 2 connected to the inner side of the dustproof plate; in the process of placing the cobalt carbonate raw material, the dustproof plate opens downward under the pressure of the cobalt carbonate raw material, and the dust generated in the process of the cobalt carbonate raw material falling downward is sucked away through the small holes 2, thereby effectively reducing the dust interference caused by the process of placing the cobalt carbonate raw material; in addition, after the cobalt carbonate raw material falls into the crushing box, the dustproof plate automatically closes under the action of the elastic reset member 2. Due to the frequent movement of the dustproof plate, it is easy to cause fatigue of the elastic reset member 2, which leads to the dustproof plate not closing tightly. At this time, the negative pressure formed by the dustproof plate at the air guide hood can be used to make the dustproof plate stably attracted to the air guide hood, so that the dustproof plate is closed more completely and the dustproof effect during the crushing process is better.

[0016] In summary, based on the fact that the location where dust is generated during crushing is often located at the location where crushing occurs, that is, close to the crushing roller, a dust suction hole is provided on the crushing roller, and the first dust suction device is used to suction the dust near the crushing roller, thereby reducing the dust suction pressure on the top of the crushing box, and at the same time making the dust suction more thorough, further reducing the burden of cleaning the dust in the later stage, and cooperating with the second dust suction device to achieve a two-way dust suction effect, the dust suction effect is better; and through the dredging mechanism provided on the inner side of the crushing roller, when the crushing roller rotates around its axis to crush the cobalt carbonate raw material, the movable plate with the dredging needle rotates synchronously with the crushing roller, and when the movable plate rotates to contact with the cam, the movable plate is blocked by the cam. The elastic reset piece is squeezed to insert the unclogging needle into the dust suction hole. When the movable plate is rotated to separate from the cam, the movable plate, under the action of the elastic reset piece, takes the unclogging needle away from the dust suction hole, thereby unclogging the dust suction hole. Every time the crushing roller rotates one circle, the dust suction hole is only unclogged once by the unclogging needle, which can ensure both timely unclogging of the dust suction hole and stable dust suction of the dust suction hole. The dustproof plate can be used to prevent dust and can also remove dust over a large area, thereby achieving better dust removal effect. When the dustproof plate is closed, the negative pressure formed by the dustproof plate at the guide cover can be utilized to stably attract the dustproof plate at the guide cover, thereby making the dustproof plate more completely closed and achieving better dust prevention effect during the crushing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the first embodiment of the present application; Figure 2 This is a schematic diagram of the planar structure of the first embodiment of the present application; Figure 3 This is a schematic diagram of the three-dimensional structure of the first embodiment of the present application in a state where the drive box is hidden; Figure 4 This is a schematic cross-sectional structure diagram of a crushing roller according to the first embodiment of the present application; Figure 5 This is a schematic diagram of the three-dimensional structure of the dredging component in the first embodiment of the present application; Figure 6 This is a demonstration diagram of the dustproof plate in the closed state of the first embodiment of the present application; Figure 7 This is a demonstration diagram of the first embodiment of the present application with the dustproof plate in an open state.

[0018] Description of the numbers in the figure: 1. Crushing box; 2. Crushing roller; 201. Dust suction hole; 202. Crushing teeth; 3. Driving box; 4. Driving motor; 5. Main gear; 6. Outer gear ring; 7. Mounting frame; 8. Dust suction pipe; 801. Dust suction through hole; 9. Cam; 10. Unclogging component; 101. Movable plate; 102. Unclogging needle; 103. Limiting slide bar; 104. Elastic reset member 1; 11. First dust suction device; 12. Dustproof plate; 13. Second dust suction device; 14. Elastic reset member 2; 15. Air guide cover. DETAILED DESCRIPTION

[0019] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0020] The first implementation method: The present invention provides a cobalt carbonate raw material crushing device, please refer to Figure 1-7 , including a crushing box 1, and a plurality of crushing rollers 2 installed horizontally and parallelly on the inner side of the crushing box 1, a driving mechanism for driving the plurality of crushing rollers 2 to rotate is installed on one side outer wall of the crushing box 1, a first dust suction device 11 is installed on one side outer wall of the crushing box 1, a plurality of dust suction holes 201 are evenly arranged on the crushing roller 2, a dust suction pipe 8 is arranged on the inner side of the crushing roller 2, a plurality of dust suction through holes 801 are evenly arranged on the dust suction pipe 8, the dust suction pipe 8 is coaxially arranged with the crushing roller 2, one end of the dust suction pipe 8 passes through the crushing box 1 and is connected to the first dust suction device 11 through a pipeline, a dredging mechanism is arranged on the inner side of the crushing roller 2, and the dust suction holes 201 are dredged during the rotation of the crushing roller 2 around its axis, a second dust suction device 13 is installed on one side outer wall of the crushing box 1, and the dust suction end of the second dust suction device 13 extends to the upper port of the crushing box 1.

[0021] In the above-mentioned cobalt carbonate raw material crushing device, based on the fact that the position where dust is generated during crushing is often located at the position where crushing occurs, that is, the position close to the crushing roller 2, a dust suction hole 201 is provided on the crushing roller 2, and the first dust suction device 11 is used to suction the dust near the crushing roller 2, thereby reducing the dust suction pressure on the top of the crushing box 1, and at the same time making the dust suction more thorough, further reducing the burden of dust cleaning in the later stage, and cooperating with the second dust suction device 13 to achieve a two-way dust suction effect, and the dust suction effect is better; and through the dredging mechanism provided on the inner side of the crushing roller 2, the dust suction hole 201 can be dredged during the process of the crushing roller 2 rotating around its axis to crush the cobalt carbonate raw material, thereby ensuring the stable dust suction effect of the dust suction hole 201.

[0022] The dredging mechanism includes a plurality of dredging components 10, and the plurality of dredging components 10 are evenly distributed along the circumference of the inner wall of the crushing roller 2. Specifically, Figure 4-7It is shown that the unclogging assembly 10 includes a movable plate 101, an unclogging needle 102 and an elastic reset member 104. The length direction of the movable plate 101 is consistent with the axial direction of the crushing roller 2. Both ends of the movable plate 101 are fixed to the inner wall of the crushing roller 2 through an elastic reset member 104. A plurality of unclogging needles 102 are provided, and the plurality of unclogging needles 102 are equidistantly fixed along the length direction of the movable plate 101. The plurality of unclogging needles 102 are arranged one-to-one correspondingly to the plurality of dust suction holes 201. Cams 9 are fixed at the positions of the dust suction pipe 8 near the two ends of the crushing roller 2.

[0023] Based on the coordinated arrangement of the above structure, in the process of the crushing roller 2 rotating around its axis to crush the cobalt carbonate raw material, the movable plate 101 rotates synchronously with the crushing roller 2 with the unclogging needle 102. When the movable plate 101 rotates to contact with the cam 9, under the obstruction of the cam 9, the movable plate 101 squeezes the elastic reset member 104, so that the unclogging needle 102 is inserted into the dust suction hole 201. When the movable plate 101 rotates to separate from the cam 9, the movable plate 101, under the action of the elastic reset member 104, separates the unclogging needle 102 from the dust suction hole 201, and realizes the unclogging effect on the dust suction hole 201. For every rotation of the crushing roller 2, the dust suction hole 201 is only unclogged once by the unclogging needle 102, which can ensure the timely unclogging effect on the dust suction hole 201 and the stable dust suction effect of the dust suction hole 201.

[0024] In addition, the unclogging component 10 also includes a limiting slide bar 103, two limiting slide bars 103 are provided, and the two limiting slide bars 103 are respectively fixed at the two end positions of the crushing roller 2, and are arranged perpendicular to the axis of the crushing roller 2, and slide through the movable plate 101. The limiting slide bar 103 can ensure that the unclogging needle 102 can be accurately inserted into the dust suction hole 201.

[0025] Among them, a plurality of crushing teeth 202 are evenly and integrally arranged on the outer wall of the crushing roller 2, and the driving mechanism includes a driving box 3, a driving motor 4 and a transmission assembly. The driving box 3 is fixed on the outer wall of the crushing box 1, the driving motor 4 is installed on the inner side of the driving box 3, and the transmission assembly is installed between the output end of the driving motor 4 and the crushing roller 2.

[0026] Regarding the transmission components, specifically, Figure 3 As shown, the transmission assembly includes a main gear 5 and a plurality of outer gear rings 6. The main gear 5 is coaxially fixed to the output end of the driving motor 4. The plurality of outer gear rings 6 are coaxially fixed to the ends of the plurality of crushing rollers 2 in a one-to-one correspondence and are meshed with each other. The main gear 5 is meshed with one of the outer gear rings 6. A mounting frame 7 fixed to the other end of the dust suction pipe 8 is also provided on the inner side of the driving box 3. The mounting frame 7 is fixed to the outer wall of the crushing box 1.

[0027] Working principle: The driving motor 4 drives several crushing rollers 2 to rotate through the transmission assembly, and the rotating crushing rollers 2 are used to crush the cobalt carbonate raw material. During the crushing process, the first dust suction device 11 is used to suck the dust near the crushing rollers 2, thereby reducing the dust suction pressure on the top of the crushing box 1. At the same time, the dust can be sucked more thoroughly, further reducing the burden of cleaning dust in the later stage. The second dust suction device 13 is used to realize a two-way dust suction effect, and the dust suction effect is better; During the process of the crushing roller 2 rotating around its axis to crush the cobalt carbonate raw material, the movable plate 101 rotates synchronously with the crushing roller 2 with the unclogging needle 102. When the movable plate 101 rotates to contact with the cam 9, under the obstruction of the cam 9, the movable plate 101 squeezes the elastic reset member 104, so that the unclogging needle 102 is inserted into the dust suction hole 201. When the movable plate 101 rotates to separate from the cam 9, the movable plate 101, under the action of the elastic reset member 104, separates the unclogging needle 102 from the dust suction hole 201, and realizes the unclogging effect on the dust suction hole 201. For each rotation of the crushing roller 2, the dust suction hole 201 is only unclogged once by the unclogging needle 102, which can ensure the timely unclogging effect on the dust suction hole 201 and the stable dust suction effect of the dust suction hole 201.

[0028] Second implementation method: Based on Implementation 1, this implementation adds the following structure, so that this application has a better dustproof effect, and the specific configuration is as follows: Figure 1-3 , Figure 6 and Figure 7 As shown, a dustproof plate 12 is symmetrically hinged at the upper port of the crushing box 1, the dustproof plate 12 is set to be hollow, and the lower end surface of the dustproof plate 12 is densely covered with small holes connected to the inner side of the dustproof plate 12, and the dust suction end of the second dust suction device 13 is connected to the inner side of the dustproof plate 12 through a hose. The dustproof plate 12 can be used for dust prevention and can also remove dust over a large area, so that the dust removal effect is better.

[0029] Among them, an elastic reset member 14 is fixedly connected between the lower end of the dustproof plate 12 and the inner wall of the crushing box 1, so that the dustproof plate 12 can be automatically closed under the action of the elastic reset member 14.

[0030] Among them, a guide cover 15 is arranged on the upper side of the hinged end of the dustproof plate 12, and the guide cover 15 is fixed to the inner wall of the crushing box 1. The upper end surface of the dustproof plate 12 located directly below the guide cover 15 is densely covered with small holes 2 connected to the inner side of the dustproof plate 12.

[0031] Based on the coordinated arrangement of the above structure, in the process of placing the cobalt carbonate raw material, the dustproof plate 12 opens downward under the pressure of the cobalt carbonate raw material, and the dust generated in the process of the cobalt carbonate raw material falling downward is sucked away through the small hole 2, thereby effectively reducing the dust interference caused by the process of placing the cobalt carbonate raw material; in addition, after the cobalt carbonate raw material falls into the crushing box 1, the dustproof plate 12 automatically closes under the action of the elastic reset member 2 14. Due to the frequent movement of the dustproof plate 12, it is easy to cause fatigue of the elastic reset member 2 14, which leads to the dustproof plate 12 not closing tightly. At this time, the negative pressure formed by the dustproof plate 12 at the guide cover 15 can be used to make the dustproof plate 12 stably attracted to the guide cover 15, so that the dustproof plate 12 is closed more completely, and the dustproof effect during the crushing process is better.

[0032] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A cobalt carbonate raw material crushing device, comprising a crushing box (1), and a plurality of crushing rollers (2) installed horizontally and parallel to the inner side of the crushing box (1), wherein a driving mechanism for driving the plurality of crushing rollers (2) to rotate is installed on one side outer wall of the crushing box (1), characterized in that: A first dust suction device (11) is installed on one side outer wall of the crushing box (1); a plurality of dust suction holes (201) are evenly arranged on the crushing roller (2); a dust suction pipe (8) is arranged on the inner side of the crushing roller (2); a plurality of dust suction through holes (801) are evenly arranged on the dust suction pipe (8); the dust suction pipe (8) is coaxially arranged with the crushing roller (2); one end of the dust suction pipe (8) passes through the crushing box (1) and is connected to the first dust suction device (11) through a pipeline; A dredging mechanism is provided on the inner side of the crushing roller (2), and the dust suction hole (201) is dredged during the process of the crushing roller (2) rotating around its axis; A second dust suction device (13) is installed on one side outer wall of the crushing box (1), and a dust suction end of the second dust suction device (13) extends to an upper end of the crushing box (1).

2. A cobalt carbonate raw material crushing device according to claim 1, characterized in that: The dredging mechanism comprises a plurality of dredging components (10), wherein the plurality of dredging components (10) are evenly distributed along the circumference of the inner wall of the crushing roller (2); The dredging assembly (10) comprises a movable plate (101), a dredging needle (102) and an elastic reset member (104); the length direction of the movable plate (101) is consistent with the axial direction of the crushing roller (2); both ends of the movable plate (101) are fixed to the inner wall of the crushing roller (2) via the elastic reset member (104); A plurality of the dredging needles (102) are provided, and the plurality of the dredging needles (102) are fixed at equal distances along the length direction of the movable plate (101), and the plurality of the dredging needles (102) are provided in one-to-one correspondence with the plurality of the dust suction holes (201); Cams (9) are fixed to the dust suction pipe (8) at positions close to both ends of the crushing roller (2).

3. A cobalt carbonate raw material crushing device according to claim 2, characterized in that: The dredging assembly (10) further comprises a limiting sliding rod (103), two limiting sliding rods (103) are provided, the two limiting sliding rods (103) are respectively fixed to the two end positions of the crushing roller (2), are arranged perpendicular to the axis of the crushing roller (2), and slide through the movable plate (101).

4. A cobalt carbonate raw material crushing device according to claim 3, characterized in that: A plurality of crushing teeth (202) are uniformly and integrally arranged on the outer wall of the crushing roller (2); the driving mechanism comprises a driving box (3), a driving motor (4) and a transmission assembly; the driving box (3) is fixed to the outer wall of the crushing box (1); the driving motor (4) is mounted on the inner side of the driving box (3); and the transmission assembly is mounted between the output end of the driving motor (4) and the crushing roller (2).

5. A cobalt carbonate raw material crushing device according to claim 4, characterized in that: The transmission assembly comprises a main gear (5) and a plurality of outer gear rings (6), wherein the main gear (5) is coaxially fixed to the output end of the drive motor (4), and the plurality of outer gear rings (6) are coaxially fixed to the ends of the plurality of crushing rollers (2) in a one-to-one correspondence and are meshed with each other, and the main gear (5) is meshed with one of the outer gear rings (6); A mounting frame (7) fixed to the other end of the dust suction pipe (8) is also provided on the inner side of the driving box (3), and the mounting frame (7) is fixed to the outer wall of the crushing box (1).

6. The cobalt carbonate raw material crushing device according to claim 1, characterized in that: A dustproof plate (12) is symmetrically hinged at the upper end of the crushing box (1), the dustproof plate (12) being arranged to be hollow, the lower end surface of the dustproof plate (12) being densely covered with small holes connected to the inner side of the dustproof plate (12), and the dust suction end of the second dust suction device (13) being connected to the inner side of the dustproof plate (12) via a hose.

7. A cobalt carbonate raw material crushing device according to claim 6, characterized in that: A second elastic reset member (14) is fixedly connected between the lower end of the dustproof plate (12) and the inner wall of the crushing box (1).

8. A cobalt carbonate raw material crushing device according to claim 7, characterized in that: A flow guide cover (15) is provided on the upper side of the hinged end of the dustproof plate (12), and the flow guide cover (15) is fixed to the inner wall of the crushing box (1); The upper end surface of the dustproof plate (12) located directly below the air guide cover (15) is densely covered with small holes 2 that are connected to the inner side of the dustproof plate (12).

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