Environment-friendly coal crushing and conveying device

Abstract

This invention discloses an environmentally friendly coal crushing and conveying device, specifically relating to the field of coal crushing equipment. It includes a crushing box, a feeding hopper fixedly installed on the top of the crushing box, a crushing roller mill installed on the inner wall of the feeding hopper, a conveyor belt installed at the bottom of the crushing roller mill, and a receiving and buffering mechanism installed at the bottom of the feeding hopper. This invention features a receiving box at the bottom of the crushing equipment capable of reciprocating up-and-down movement. The receiving box receives and buffers falling coal, releasing it onto the conveyor belt, preventing coal from being directly thrown onto the conveyor belt and generating large amounts of dust. Simultaneously, a structure is installed on the conveyor belt to move the coal and collect dust, further preventing the coal transported by the conveyor belt from affecting the external environment after it is discharged.

Description

Technical Field

[0001] This invention relates to the field of coal crushing equipment technology, and more specifically, to an environmentally friendly coal crushing and conveying device. Background Technology

[0002] Coal is mainly composed of elements such as carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus. The total amount of carbon, hydrogen, and oxygen accounts for more than 95% of the organic matter. It is an important raw material for the metallurgical and chemical industries. There are categories such as lignite, bituminous coal, anthracite, and semi-anthracite. Coal is a non-renewable resource. After it is mined, it needs to be crushed by a coal crusher. The coal crusher is also known as a coal pulverizer and is one of the commonly used equipment in coal crushing and coal gangue crushing production lines.

[0003] Chinese utility model patent CN209222346U discloses a coal crusher, which has a feeding port at the bottom right side of the crushing chamber and a conveyor belt on the top of the feeding plate. The crushed coal pieces are discharged to the upper surface of the conveyor belt through the feeding port. The motor drives the inner drum of the drive shaft to rotate. The conveying tool is placed on the left side of the conveyor belt in advance. The two sets of drums drive the crushed pieces on the conveyor belt to the conveying tool. This prevents the crusher from crushing too quickly and the manual conveying from being inefficient, which would cause the feeding port to be blocked, affecting the crushing efficiency and increasing the workload of the workers.

[0004] However, although the aforementioned patent documents have the function of crushing coal, they directly feed the crushed coal onto the conveyor belt without any protective measures or buffer structures. As a result, when the crushed coal is thrown onto the conveyor belt, a large amount of dust is raised due to the impact, causing a large amount of dust to escape from the crushing equipment and pollute the environment. At the same time, there is no structure to remove dust from the crushed coal on the conveyor belt, so the coal transported by the conveyor belt still contains a large amount of dust, which will still affect the external environment after it is sent out.

[0005] To address the aforementioned technical shortcomings, a solution is provided. Summary of the Invention

[0006] To overcome the aforementioned deficiencies of the prior art, this invention provides an environmentally friendly coal crushing and conveying device. This device incorporates a receiving hopper buffer mechanism, with a receiving box at the bottom of the crushing equipment capable of reciprocating up-and-down movement. The receiving box catches and buffers the falling coal before releasing it onto the conveyor belt, preventing coal from being directly thrown onto the conveyor belt and generating large amounts of dust. Furthermore, a sweeping and dust-collecting mechanism works in conjunction with a dust-collecting mechanism. A structure on the conveyor belt is designed to move the coal and collect dust. By collecting and treating the dust, the device prevents the coal transported by the conveyor belt from affecting the external environment after it is delivered, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an environmentally friendly coal crushing and conveying device, comprising a crushing box, a feeding hopper fixedly installed on the top of the crushing box, a crushing roller mill provided on the inner wall of the feeding hopper, a conveyor belt provided at the bottom of the crushing roller mill, and a hopper receiving buffer mechanism provided at the bottom of the feeding hopper.

[0008] The receiving hopper buffer mechanism includes a feeding frame connected to the bottom of the feeding hopper. The feeding frame is vertically downward. A receiving box is provided on the bottom inner wall of the feeding frame. The outer wall of the receiving box is in contact with the inner wall of the feeding frame. A limiting frame is provided at the bottom of the receiving box. The limiting frame is fixedly installed on the bottom inner wall of the feeding frame. The top of the limiting frame is in contact with the bottom of the receiving box. A baffle plate is rotatably installed at the bottom of the receiving box. The baffle plate is horizontally positioned. The area of ​​the baffle plate is smaller than the area of ​​the inner wall of the limiting frame. The outer wall of the baffle plate is in contact with the inner wall of the receiving box.

[0009] In a preferred embodiment, rotating blocks are fixedly installed on both sides of the bottom of the barrier plate. The two rotating blocks are arranged symmetrically to each other. Push-pull frames are fitted on the outer walls of the two rotating blocks. A connecting frame is fixedly installed on one side of the two push-pull frames. A reciprocating threaded rod is threadedly connected to one side of the connecting frame. The reciprocating threaded rod is arranged in a vertical position. A reduction motor is provided at the top of the reciprocating threaded rod. The reduction motor is fixedly installed on the outer wall of the feeding hopper.

[0010] In a preferred embodiment, the top two sides of the receiving box are provided with push plates, the two push plates are inclined downwards and are symmetrically arranged, the bottom of the two push plates are corresponding to the top of the two sides of the receiving box, and a receiving plate is provided on one side of each of the two push plates. The two receiving plates are slidably installed on the inner wall of the feeding hopper, the two receiving plates are symmetrically arranged, one side of the two receiving plates are in contact with each other, and a plurality of limiting springs are fixedly installed on the outer wall of the two receiving plates. The plurality of limiting springs are fixedly installed on the inner wall of the feeding hopper.

[0011] In a preferred embodiment, the top of the conveyor belt is provided with a sweeping and dust-collecting mechanism and a dust-collecting mechanism;

[0012] The sweeping and dust collection mechanism includes a dust collection chamber fixedly installed on the inner wall of the crushing box. The dust collection chamber is located at the top of the conveyor belt and is set in a vertical position. A negative pressure fan is connected to one side of the dust collection chamber, and a sweeping frame is slidably installed on the other side of the dust collection chamber. The sweeping frame is set in a horizontal position, and the bottom of the sweeping frame is in contact with the top of the conveyor belt.

[0013] In a preferred embodiment, two connecting rods are fixedly installed on both sides of the sweeping frame, and a rotating rod is provided at the bottom of the two connecting rods. The rotating rod is rotatably installed on the inner wall of the crushing box, and two reciprocating threaded grooves are opened on the outer wall of the rotating rod. The two connecting rods are threadedly connected to the two reciprocating threaded grooves respectively.

[0014] In a preferred embodiment, first pulleys are fixedly installed on the outer walls of both sides of the rotating rod, and timing belts are rotatably installed on the outer walls of the two first pulleys. Second pulleys are rotatably installed on one side of the two timing belts, and the two second pulleys are fixedly installed on the outer walls of the conveyor belt.

[0015] In a preferred embodiment, the dust collection mechanism includes a dust-proof cloth fixedly installed on the inner wall of the dust collection chamber, the dust-proof cloth being located between the dust collection chamber and the negative pressure fan, and a folding plate fixedly installed on the inner wall of the dust collection chamber, the folding plate being inclined upward.

[0016] In a preferred embodiment, a dust collection box is provided on one side of the folding plate. The outer wall of the dust collection box is in contact with the inner wall of the dust collection chamber. Multiple scrapers are fixedly installed on the top of the dust collection box. The outer walls of the multiple scrapers are in contact with the dust-proof cloth. The dust collection box penetrates the outer wall of the dust collection chamber and the crushing box. A rubber plate is fixedly installed on the outer wall of the dust collection box. A handle is fixedly installed on one side of the rubber plate. The handle extends out of the outer wall of the crushing box.

[0017] The technical effects and advantages of this invention are as follows:

[0018] 1. The present invention is based on a receiving bucket buffer mechanism. A receiving box that can reciprocate up and down is set at the bottom of the crushing equipment. The receiving box receives the falling coal and releases it onto the conveyor belt in a buffered manner, thus avoiding the situation where coal is directly thrown onto the conveyor belt and a large amount of dust is raised.

[0019] 2. At the same time, by setting up a sweeping and dust collection mechanism and a dust collection mechanism in combination, a structure that can move the coal and collect dust is set on the conveyor belt. By collecting and treating the dust, the coal transported by the conveyor belt is prevented from affecting the external environment after it is sent out. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is an internal front view of the present invention.

[0022] Figure 3 This is a schematic diagram of the bucket buffer mechanism in this invention.

[0023] Figure 4 This is a vertical sectional view of the bucket buffer mechanism in this invention.

[0024] Figure 5 This is a schematic diagram of the sweeping and dust-collecting mechanism in this invention.

[0025] Figure 6 This is a partial cross-sectional view of the sweeping and dust-collecting mechanism in this invention.

[0026] Figure 7 This is an internal front view of the dust collection mechanism in this invention.

[0027] Figure 8 This is a partial cross-sectional view of the dust collection mechanism in this invention.

[0028] The attached diagram is labeled as follows: 1. Crushing box; 2. Feeding hopper; 3. Crushing roller; 4. Conveyor belt; 5. Hopper receiving buffer mechanism; 51. Discharge frame; 52. Receiving box; 53. Limiting frame; 54. Isolation plate; 55. Rotating block; 56. Push-pull frame; 57. Connecting frame; 58. Reciprocating threaded rod; 59. Gear motor; 510. Push plate; 511. Receiving plate; 512. Limiting spring; 6. Sweeping and dust collection mechanism; 61. Dust collection bin; 62. Negative pressure fan; 63. Sweeping frame; 64. Connecting support rod; 65. Reciprocating threaded groove; 66. Rotating rod; 67. First pulley; 68. Synchronous belt; 69. Second pulley; 7. Dust collection mechanism; 71. Dustproof cloth; 72. Folding plate; 73. Dust collection box; 74. Scraper; 75. Rubber plate; 76. Handle. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1: Refer to the appendix of the instruction manual. Figures 1-8 An environmentally friendly coal crushing and conveying device, such as Figure 1 and Figure 2 As shown, it includes a crushing box 1, a feeding hopper 2 fixedly installed on the top of the crushing box 1, a crushing roller 3 installed on the inner wall of the feeding hopper 2, a conveyor belt 4 installed at the bottom of the crushing roller 3, and a receiving buffer mechanism 5 installed at the bottom of the feeding hopper 2.

[0031] like Figure 3 and Figure 4As shown, the receiving hopper buffer mechanism 5 includes a feeding frame 51 connected to the bottom of the feeding hopper 2. The feeding frame 51 is set vertically downward. The bottom inner wall of the feeding frame 51 is provided with a receiving box 52. The outer wall of the receiving box 52 is in contact with the inner wall of the feeding frame 51. The coal crushed by the crushing roller 3 in the feeding hopper 2 falls into the feeding frame 51, and the receiving box 52 in the feeding frame 51 receives the coal.

[0032] The bottom of the receiving box 52 is provided with a limiting frame 53, which is fixedly installed on the bottom inner wall of the unloading frame 51. The top of the limiting frame 53 is in contact with the bottom of the receiving box 52. A baffle plate 54 is rotatably installed on the bottom of the receiving box 52. The baffle plate 54 is set in a horizontal state. The area of ​​the baffle plate 54 is smaller than the area of ​​the inner wall of the limiting frame 53. The outer wall of the baffle plate 54 is in contact with the inner wall of the receiving box 52. When the receiving box 52 moves down, the receiving box 52 is finally stopped by the limiting frame 53, while the baffle plate 54 continues to move down and crosses the limiting frame 53 to open the bottom of the receiving box 52 and buffer the coal to the conveyor belt 4.

[0033] like Figure 3 and Figure 4 As shown, rotating blocks 55 are fixedly installed on both sides of the bottom of the baffle plate 54. The two rotating blocks 55 are arranged symmetrically. Push-pull frames 56 are fitted on the outer walls of the two rotating blocks 55. A connecting frame 57 is fixedly installed on one side of the two push-pull frames 56. A reciprocating threaded rod 58 is threadedly connected to one side of the connecting frame 57. The reciprocating threaded rod 58 is arranged vertically. A reduction motor 59 is provided at the top of the reciprocating threaded rod 58. The reduction motor 59 is fixedly installed on the outer wall of the feeding hopper 2. The reduction motor 59 drives the reciprocating threaded rod 58 to make the connecting frame 57 move up and down reciprocally. That is, the connecting frame 57 drives the push-pull frames 56 to make the rotating blocks 55 push the baffle plate 54 to move synchronously.

[0034] like Figure 3 and Figure 4 As shown, the top two sides of the receiving box 52 are provided with push plates 510. The two push plates 510 are inclined downward and symmetrically arranged. The bottom of the two push plates 510 is corresponding to the top of the two sides of the receiving box 52. A receiving plate 511 is provided on one side of each of the two push plates 510. The two receiving plates 511 are slidably installed on the inner wall of the feeding hopper 2. The two receiving plates 511 are symmetrically arranged and their sides are in contact with each other.

[0035] Multiple limiting springs 512 are fixedly installed on the outer walls of the two receiving plates 511. The multiple limiting springs 512 are fixedly installed on the inner wall of the feeding hopper 2. When the receiving box 52 moves upward, it can push open the push plates 510 on both sides, causing the push plates 510 to move the receiving plates 511 and compress the limiting springs 512, so that they move away from each other and open, thereby causing the coal caught on the two receiving plates 511 to fall into the receiving box 52.

[0036] In specific implementation, the coal crushed by the crushing roller 3 in the feeding hopper 2 falls onto two receiving plates 511 supported by two limiting springs 512. Then, the reciprocating threaded rod 58 driven by the reduction motor 59 causes the connecting frame 57 to move upward and drive the push-pull frame 56, which in turn causes the rotating block 55 to push the isolation plate 54 to move upward and drive it to move upward synchronously. Then, the push-moving plates 510 on both sides of the receiving box 52 push the receiving plates 511 to move and compress the limiting springs 512, causing them to move away from each other and open up, so that the coal caught on the two receiving plates 511 falls into the receiving box 52.

[0037] Finally, after the receiving box 52 moves down, the two receiving plates 511 continue to merge, while the receiving box 52 that receives coal moves down to the limit frame 53 and is blocked and stopped. At this time, the baffle plate 54 that is driven continues to move down and crosses the limit frame 53 to open the bottom of the receiving box 52, thereby buffering the coal and sending it to the conveyor belt 4, avoiding the situation where the coal is directly thrown onto the conveyor belt 4 and a large amount of dust is raised.

[0038] Example 2: Figure 5 and Figure 6 As shown, a sweeping and dust-collecting mechanism 6 and a dust-collecting mechanism 7 are provided on the top of the conveyor belt 4. The sweeping and dust-collecting mechanism 6 includes a dust-collecting chamber 61 fixedly installed on the inner wall of the crushing box 1. The dust-collecting chamber 61 is located on the top of the conveyor belt 4 and is set in a vertical position. A negative pressure fan 62 is connected to one side of the dust-collecting chamber 61, and a sweeping frame 63 is slidably installed on the other side of the dust-collecting chamber 61. The sweeping frame 63 is set in a horizontal position, and the bottom of the sweeping frame 63 is in contact with the top of the conveyor belt 4. When the negative pressure fan 62 is started, a negative pressure is generated in the dust-collecting chamber 61 to adsorb the dust in the coal on the conveyor belt 4.

[0039] like Figure 5 and Figure 6 As shown, two connecting rods 64 are fixedly installed on both sides of the sweeping frame 63. The bottom of the two connecting rods 64 is provided with a rotating rod 66. The rotating rod 66 is rotatably installed on the inner wall of the crushing box 1. Two reciprocating threaded grooves 65 are opened on the outer wall of the rotating rod 66. The two connecting rods 64 are threadedly connected to the two reciprocating threaded grooves 65 respectively. When the rotating rod 66 rotates, it drives the two reciprocating threaded grooves 65, so that the two connecting rods 64 drive the sweeping frame 63 to move back and forth synchronously. That is, the sweeping frame 63 sweeps the coal on the conveyor belt 4, so as to remove the dust.

[0040] like Figure 5 and Figure 6As shown, first pulleys 67 are fixedly installed on the outer walls of both sides of the rotating rod 66. Synchronous belts 68 are rotatably installed on the outer walls of the two first pulleys 67. Second pulleys 69 are rotatably installed on one side of the two synchronous belts 68. The two second pulleys 69 are fixedly installed on the outer wall of the conveyor belt 4. The rotation of the conveyor belt 4 drives the two second pulleys 69 to rotate. That is, the second pulleys 69 drive the synchronous belts 68 to make the two first pulleys 67 rotate synchronously, and then the two first pulleys 67 drive the rotating rod 66 to rotate synchronously.

[0041] like Figure 7 and Figure 8 As shown, the dust collection mechanism 7 includes a dustproof cloth 71 fixedly installed on the inner wall of the dust collection chamber 61. The dustproof cloth 71 is located between the dust collection chamber 61 and the negative pressure fan 62. A folding plate 72 is fixedly installed on the inner wall of the dust collection chamber 61. The folding plate 72 is inclined upward. The dustproof cloth 71 can block the dust collected and keep it in the folding plate 72.

[0042] like Figure 7 and Figure 8 As shown, a dust collection box 73 is provided on one side of the folding plate 72. The outer wall of the dust collection box 73 is in contact with the inner wall of the dust collection chamber 61. Multiple scrapers 74 are fixedly installed on the top of the dust collection box 73. The outer walls of the multiple scrapers 74 are in contact with the dust-proof cloth 71. The dust collection box 73 penetrates the outer wall of the dust collection chamber 61 and the crushing box 1. A rubber plate 75 is fixedly installed on the outer wall of the dust collection box 73. A handle 76 is fixedly installed on one side of the rubber plate 75. The handle 76 extends out of the outer wall of the crushing box 1. After the work is completed, by pulling the handle 76, the dust collection box 73 moves out synchronously with the multiple scrapers 74, and the multiple scrapers 74 scrape off the dust on the dust-proof cloth 71 and collect it.

[0043] In specific implementation, the operation and rotation of the conveyor belt 4 drives the two second pulleys 69 to rotate, that is, the second pulleys 69 drive the synchronous belt 68 to make the two first pulleys 67 rotate synchronously, and then the two first pulleys 67 drive the rotating rod 66 to rotate synchronously. The rotation of the rotating rod 66 drives the two reciprocating threaded grooves 65 to make the two connecting support rods 64 drive the sweeping frame 63 to move synchronously back and forth. That is, the sweeping frame 63 sweeps the coal on the conveyor belt 4 to facilitate the removal of dust. At this time, the negative pressure fan 62 is started to generate negative pressure in the dust collection chamber 61 to adsorb the dust in the coal on the conveyor belt 4, and the dust isolation cloth 71 can block the dust and place it in the folding plate 72.

[0044] After the work is completed, by pulling the handle 76, the dust collection box 73 moves out simultaneously with multiple scrapers 74, and the multiple scrapers 74 scrape off the dust on the dust-proof cloth 71 and collect it, thus avoiding the coal transported by the conveyor belt from affecting the external environment after it is sent out.

[0045] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0046] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0047] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An environmentally friendly coal crushing and conveying device, comprising a crushing box (1), wherein a feeding hopper (2) is fixedly installed on the top of the crushing box (1), a crushing roller mill (3) is provided on the inner wall of the feeding hopper (2), and a conveyor belt (4) is provided at the bottom of the crushing roller mill (3), characterized in that: The bottom of the feeding hopper (2) is provided with a hopper receiving buffer mechanism (5); The receiving hopper buffer mechanism (5) includes a feeding frame (51) connected to the bottom of the feeding hopper (2). The feeding frame (51) is set vertically downward. A receiving box (52) is provided on the bottom inner wall of the feeding frame (51). The outer wall of the receiving box (52) is in contact with the inner wall of the feeding frame (51). A limiting frame (53) is provided at the bottom of the receiving box (52). The limiting frame (53) is fixedly installed on the bottom inner wall of the feeding frame (51). The top of the limiting frame (53) is in contact with the bottom of the receiving box (52). A baffle plate (54) is rotatably installed at the bottom of the receiving box (52). The baffle plate (54) is set horizontally. The area of ​​the baffle plate (54) is smaller than the area of ​​the inner wall of the limiting frame (53). The outer wall of the baffle plate (54) is in contact with the inner wall of the receiving box (52). Rotary blocks (55) are fixedly installed on both sides of the bottom of the partition plate (54). The two rotating blocks (55) are arranged symmetrically to each other. Push-pull frames (56) are sleeved on the outer walls of the two rotating blocks (55). A connecting frame (57) is fixedly installed on one side of the two push-pull frames (56). A reciprocating threaded rod (58) is threadedly connected to one side of the connecting frame (57). The reciprocating threaded rod (58) is arranged in a vertical state. A reduction motor (59) is provided at the top of the reciprocating threaded rod (58). The reduction motor (59) is fixedly installed on the outer wall of the feeding hopper (2). The receiving box (52) has two push plates (510) on its top sides. The two push plates (510) are inclined downwards and are symmetrically arranged. The bottom of the two push plates (510) is corresponding to the top of the two sides of the receiving box (52). The two push plates (510) are respectively provided with receiving plates (511) on one side. The two receiving plates (511) are slidably installed on the inner wall of the feeding hopper (2). The two receiving plates (511) are symmetrically arranged and their sides are in contact with each other. Multiple limiting springs (512) are fixedly installed on the outer wall of the two receiving plates (511). The multiple limiting springs (512) are fixedly installed on the inner wall of the feeding hopper (2). The top of the conveyor belt (4) is provided with a sweeping and dust-collecting mechanism (6) and a dust-collecting mechanism (7); The sweeping and dust collection mechanism (6) includes a dust collection chamber (61) fixedly installed on the inner wall of the crushing box (1). The dust collection chamber (61) is located at the top of the conveyor belt (4). The dust collection chamber (61) is set in a vertical state. A negative pressure fan (62) is connected to one side of the dust collection chamber (61). A sweeping frame (63) is slidably installed on the other side of the dust collection chamber (61). The sweeping frame (63) is set in a horizontal state. The bottom of the sweeping frame (63) is in contact with the top of the conveyor belt (4). The sweeping frame (63) is fixedly installed with connecting rods (64) on both sides. The bottom of the two connecting rods (64) is provided with a rotating rod (66). The rotating rod (66) is rotatably installed on the inner wall of the crushing box (1). The outer wall of the rotating rod (66) is provided with two reciprocating threaded grooves (65). The two connecting rods (64) are threadedly connected to the two reciprocating threaded grooves (65) respectively. The two outer walls of the rotating rod (66) are fixedly installed with first pulleys (67), the outer walls of the two first pulleys (67) are rotatably installed with synchronous belts (68), the two synchronous belts (68) are rotatably installed with second pulleys (69) on one side, and the two second pulleys (69) are fixedly installed on the outer wall of the conveyor belt (4).

2. The environmentally friendly coal crushing and conveying device according to claim 1, characterized in that: The dust collection mechanism (7) includes a dustproof cloth (71) fixedly installed on the inner wall of the dust collection chamber (61). The dustproof cloth (71) is located between the dust collection chamber (61) and the negative pressure fan (62). A folding plate (72) is fixedly installed on the inner wall of the dust collection chamber (61). The folding plate (72) is inclined upward.

3. The environmentally friendly coal crushing and conveying device according to claim 2, characterized in that: A dust collection box (73) is provided on one side of the folding plate (72). The outer wall of the dust collection box (73) is in contact with the inner wall of the dust collection chamber (61). Multiple scrapers (74) are fixedly installed on the top of the dust collection box (73). The outer walls of the multiple scrapers (74) are in contact with the dust-proof cloth (71). The dust collection box (73) penetrates the outer wall of the dust collection chamber (61) and the crushing box (1). A rubber plate (75) is fixedly installed on the outer wall of the dust collection box (73). A handle (76) is fixedly installed on one side of the rubber plate (75). The handle (76) extends out of the outer wall of the crushing box (1).

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