A grinding device for biobased materials

Abstract

The present invention relates to the technical field of grinding equipment, and specifically discloses a bio-based material grinding device, including a box body, positioning plates are fixedly connected to the left and right ends of the box body, a screening cylinder is rotatably connected between the outer walls of the two sets of positioning plates, a grinding mechanism is arranged inside the screening cylinder, the grinding mechanism and the screening cylinder are connected by a transmission mechanism, a discharging mechanism is arranged at the lower end of the box body, and a dredging mechanism is arranged at the upper end of the box body. The present invention sets a first grinding side plate and a second grinding side plate, and the spacing between the first grinding side plate and the grinding roller is smaller than the spacing between the second grinding side plate and the grinding roller, so that the grinding roller rotates in the reverse direction after rotating in the forward direction, thereby achieving the effect of progressive and graded grinding of the material.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding equipment, and in particular relates to a bio-based material grinding device. Background Art

[0002] Bio-based materials refer to a new type of materials that are made from renewable materials, including crops, trees and other plants, their residues and contents, through biological, chemical and physical means. They mainly include bioplastics, bio-based platform compounds, biomass functional polymer materials, functional sugar products, wood-based engineering materials and other products. They are green, environmentally friendly, made from renewable raw materials and are biodegradable. They have great development potential, and it is very necessary to carry out research and development work on bio-based materials.

[0003] In the application process of most bio-based materials, they need to be further crushed and ground to facilitate the subsequent production and processing of their bio-based raw materials. However, during the grinding process, the materials are often deposited at the bottom of the device, so that only part of the materials are in contact with the grinding media, which will cause uneven grinding and affect the subsequent production and processing of bio-based materials. Summary of the invention

[0004] The purpose of the present invention is to provide a bio-based material grinding device to solve the problem in the prior art that uneven grinding affects subsequent production and processing.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bio-based material grinding device comprises a box body, wherein positioning plates are fixedly connected to the left and right ends of the box body, a screening cylinder is rotatably connected between the outer walls of two groups of the positioning plates, a grinding mechanism is arranged inside the screening cylinder, the grinding mechanism and the screening cylinder are connected through a transmission mechanism, a discharging mechanism is arranged at the lower end of the box body, and a dredging mechanism is arranged at the upper end of the box body.

[0007] Preferably: the grinding mechanism includes a grinding roller and a grinding side plate, a first rotating shaft is rotatably connected between the two groups of positioning plates, both ends of the first rotating shaft pass through the outside of the box, a grinding roller is fixedly connected to the side wall of the first rotating shaft, a first grinding side plate and a second grinding side plate are fixedly connected between the two groups of positioning plates, the first grinding side plate is located at the front end of the grinding roller, and the second grinding side plate is located at the rear end of the grinding roller, a servo motor is fixedly connected to the left end of the box, and the output shaft end of the servo motor is fixedly connected to the left end of the first rotating shaft.

[0008] Preferably, the first grinding side plate and the second grinding side plate are both fixedly connected with extension parts on their upper ends, and the two groups of extension parts are in the shape of an inverted "eight" shape.

[0009] Preferably, the distance between the side wall of the grinding roller and the side wall of the first grinding side plate is less than the distance between the side wall of the grinding roller and the side wall of the second grinding side plate.

[0010] Preferably, a material turning component is equidistantly arranged inside the screening cylinder. The material turning component includes a rotating shaft and a baffle. Fixed rings are fixedly connected to both the left and right ends of the screening cylinder. A rotating shaft is rotatably connected between the two fixed rings at equal intervals. A baffle is fixedly connected to the side wall of the rotating shaft. A transmission mechanism is arranged inside the positioning disk at the left end of the screening cylinder.

[0011] Preferably, the transmission mechanism includes a first gear and a second gear. The first gear is fixedly connected to the side wall of the first rotating shaft. The second gear is rotatably connected inside the positioning disk at the left end of the screening cylinder. The first gear meshes with the second gear. A toothed ring is rotatably connected to the inner wall of the fixed ring. The toothed ring meshes with the second gear. Limiting grooves and first storage grooves are equidistantly formed on the inner wall of the fixed ring. Limiting blocks are fixedly connected to the outer wall of the toothed ring at equal intervals. The limiting blocks are located inside the limiting grooves and are slidably connected thereto.

[0012] Preferably, a second storage groove is formed inside the first storage groove. The left end of the rotating shaft penetrates into the second storage groove. A third gear is fixedly connected to the side wall of the rotating shaft. The third gear is located inside the second storage groove. Teeth are equidistantly arranged on the outer wall of the toothed ring. The teeth mesh with the third gear.

[0013] Preferably, guide blocks are fixedly connected to the inside of the screening cylinder at equal intervals.

[0014] Preferably, the discharging mechanism includes a collecting box and an auger. The collecting box is fixedly connected to the lower end of the box body. The inside of the collecting box is communicated with the inside of the box body. A second rotating shaft is rotatably connected to the inside of the collecting box. The auger is fixedly connected to the side wall of the second rotating shaft. The first motor is fixedly connected to the left end of the collecting box. The output shaft end of the first motor is fixedly connected to the left end of the second rotating shaft.

[0015] Preferably, the dredging mechanism includes a cam and a knocking block. A transmission shaft is rotatably connected to the upper end of the box body through a bearing seat. The cams are fixedly connected to the side wall of the transmission shaft at equal intervals. A push rod is arranged at the upper end of the box body. The side wall of the push rod abuts against the side wall of the cam. The right end of the push rod is fixedly connected to a lifting frame. The lower end of the lifting frame penetrates into the box body and is slidably connected to the box wall. A spring is fixedly connected to the lower side inside the lifting frame. The upper end of the spring is fixedly connected to the inner wall of the box body. The knocking block is fixedly connected to the lower end of the lifting frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The present invention is provided with a first grinding side plate and a second grinding side plate. At the same time, the distance between the first grinding side plate and the grinding roller is smaller than the distance between the second grinding side plate and the grinding roller, so that the grinding roller rotates forward and then reversely, thereby achieving the effect of classifying and grinding the material.

[0018] 2. When the screening cylinder rotates in the present invention and with the cooperation of the guiding block, it can drive the material to move left or right. Also, with the cooperation of the material turning assembly, it can move the material at the bottom to the grinding mechanism, thereby solving the problem that uneven grinding affects subsequent production and processing.

[0019] 3. With the cooperation of the rotating cam and the spring in the present invention, it can drive the knocking block in the lifting frame to knock on the outer wall of the screening cylinder, and then dredge the screening holes opened on the screening cylinder through the vibration brought by high-frequency knocking, thereby achieving the dredging effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 is a schematic diagram of the main cross-sectional structure of the box body of the present invention;

[0022] Figure 3 is a schematic diagram of the left view structure of the fixing ring of the present invention;

[0023] Figure 4 is of the present invention Figure 2 The enlarged structure diagram of part A in;

[0024] Figure 5 is of the present invention Figure 2 The enlarged structure diagram of part B in;

[0025] Figure 6 is a schematic diagram of the exploded structure of the screening cylinder and the positioning disk of the present invention;

[0026] Figure 7 is a schematic diagram of the left cross-sectional plane structure of the screening cylinder of the present invention;

[0027] Figure 8 is of the present invention Figure 2 The enlarged structure diagram of part C in.

[0028] In the figure: 1. box body; 11. positioning plate; 2. screening cylinder; 21. fixing ring; 211. limiting groove; 212. first receiving groove; 213. second receiving groove; 22. turning assembly; 221. rotating shaft; 222. baffle; 223. third gear; 23. guide block; 3. grinding mechanism; 31. first rotating shaft; 32. grinding roller; 33. first grinding side plate; 34. second grinding side plate; 35. extension part; 4. transmission mechanism; 41. first gear; 42. second gear; 43. gear ring; 44. limiting block; 45. teeth; 5. discharging mechanism; 51. collecting box; 52. second rotating shaft; 53. auger; 54. first motor; 6. dredging mechanism; 61. transmission shaft; 62. cam; 63. second motor; 64. lifting frame; 65. knocking block; 66. spring; 67. push rod; 7. servo motor. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Reference Figures 1-6 As shown, the present invention provides a bio-based material grinding device, including a box body 1, positioning plates 11 are fixedly connected to the left and right ends of the box body 1, a screening cylinder 2 is rotatably connected between the outer walls of the two groups of positioning plates 11, a grinding mechanism 3 is arranged inside the screening cylinder 2, the grinding mechanism 3 and the screening cylinder 2 are connected through a transmission mechanism 4, a discharging mechanism 5 is arranged at the lower end of the box body 1, and a dredging mechanism 6 is arranged at the upper end of the box body 1, the material can be ground when the grinding mechanism 3 is in operation, and at the same time, under the cooperation of the effect of the transmission mechanism 4, the screening cylinder 2 is driven to rotate, and then the material can be rotated, so that the ground material is screened through the screening cylinder 2, thereby achieving the effect of grinding and screening.

[0031] In a further embodiment, referring to Figures 6-7 The grinding mechanism 3 includes a grinding roller 32 and a grinding side plate. A first rotating shaft 31 is rotatably connected between the two groups of positioning disks 11. Both ends of the first rotating shaft 31 penetrate the outside of the box body 1. The side wall of the first rotating shaft 31 is fixedly connected to the grinding roller 32. A first grinding side plate 33 and a second grinding side plate 34 are fixedly connected between the two groups of positioning disks 11. The first grinding side plate 33 is located at the front end of the grinding roller 32, and the second grinding side plate 34 is located at the rear end of the grinding roller 32. A servo motor 7 is fixedly connected to the left end of the box body 1, and the output shaft end of the servo motor 7 is fixedly connected to the left end of the first rotating shaft 31.

[0032] In this embodiment, the servo motor 7 is started to drive the first rotating shaft 31 to rotate. The rotation of the first rotating shaft 31 drives the grinding roller 32 to rotate. When the grinding roller 32 rotates, it can cooperate with the first grinding side plate 33 or the second grinding side plate 34 to grind the material.

[0033] In a further embodiment, referring to Figure 7 , extension parts 35 are fixedly connected to the upper ends of both the first grinding side plate 33 and the second grinding side plate 34, and the two groups of extension parts 35 are in an inverted "V" shape.

[0034] In this embodiment, the provided extension parts 35 can better receive the material flipped up from the bottom of the screening cylinder 2. At the same time, the extension parts 35 are set in an inverted "V" shape, so that the material can be piled up in the extension parts 35, thus achieving the effect of collecting the material.

[0035] In a further embodiment, referring to Figure 7 , the distance between the side wall of the grinding roller 32 and the side wall of the first grinding side plate 33 is smaller than the distance between the side wall of the grinding roller 32 and the side wall of the second grinding side plate 34.

[0036] In this embodiment, when the grinding roller 32 rotates, the material will act between the grinding roller 32 and the second grinding side plate 34, thus achieving the effect of preliminary grinding of the material. When the grinding roller 32 rotates in the reverse direction, the material will act between the grinding roller 32 and the first grinding side plate 33, thus achieving the effect of secondary grinding of the material.

[0037] In a further embodiment, referring to Figures 3-7 , turning components 22 are equidistantly arranged inside the screening cylinder 2. The turning components 22 include a rotating shaft 221 and a baffle 222. Fixed rings 21 are fixedly connected to both the left and right ends of the screening cylinder 2. The rotating shaft 221 is rotatably connected between the two groups of fixed rings 21 at equal intervals. A baffle 222 is fixedly connected to the side wall of the rotating shaft 221. A transmission mechanism 4 is arranged inside the positioning disk 11 at the left end of the screening cylinder 2.

[0038] In this embodiment, when the first rotating shaft 31 rotates, the screening cylinder 2 is driven to rotate in the reverse direction through the transmission mechanism 4. When the screening cylinder 2 rotates, the baffle 222 will be driven to rotate, so that the baffle 222 forms a certain angle with the side wall of the screening cylinder 2, thus facilitating the movement of the material. When the first rotating shaft 31 rotates in the reverse direction, the baffle 222 rotates in the reverse direction, and thus when the first rotating shaft 31 rotates in the reverse direction, the material in the screening cylinder 2 can also be driven to move.

[0039] In a further embodiment, referring to Figures 2-6, the transmission mechanism 4 includes a first gear 41 and a second gear 42. The side wall of the first rotating shaft 31 is fixedly connected with the first gear 41. Inside the positioning disk 11 at the left end of the screening cylinder 2, the second gear 42 is rotatably connected. The first gear 41 meshes with the second gear 42. The inner wall of the fixed ring 21 is rotatably connected with a toothed ring 43. The toothed ring 43 meshes with the second gear 42. The inner wall of the fixed ring 21 is equidistantly provided with limiting grooves 211 and first receiving grooves 212. The outer wall of the toothed ring 43 is equidistantly fixedly connected with limiting blocks 44. The limiting blocks 44 are located inside the limiting grooves 211 and are slidably connected therewith. A second receiving groove 213 is provided inside the first receiving groove 212. The left end of the rotating shaft 221 penetrates into the second receiving groove 213. A third gear 223 is fixedly connected to the side wall of the rotating shaft 221. The third gear 223 is located inside the second receiving groove 213. The outer wall of the toothed ring 43 is equidistantly provided with teeth 45. The teeth 45 mesh with the third gear 223.

[0040] In this embodiment, since the frictional force between the screening cylinder 2 and the positioning disk 11 is greater than the gravity of the material received by the rotating plate, the rotation of the first rotating shaft 31 drives the rotation of the first gear 41. The rotation of the first gear 41 drives the rotation of the second gear 42. The rotation of the second gear 42 drives the rotation of the toothed ring 43. The rotation of the toothed ring 43 drives the movement of the teeth 45 and the limiting blocks 44. The movement of the teeth 45 drives the rotation of the third gear 223. The rotation of the third gear 223 drives the rotation of the rotating shaft 221, thereby providing power for the rotation of the baffle 222. When the limiting block 44 moves to one end of the limiting groove 211, the limiting block 44 abuts against the end face of the limiting groove 211. Further moving the limiting block 44 can drive the screening cylinder 2 to rotate.

[0041] In a further embodiment, refer to Figure 3 , guide blocks 23 are fixedly connected equidistantly inside the screening cylinder 2.

[0042] In this embodiment, when the screening cylinder 2 rotates and with the cooperation of the guide blocks 23, the material can be driven to move left or right, thereby solving the problem that only part of the material is in contact with the grinding medium, resulting in uneven grinding.

[0043] In a further embodiment, refer to Figures 1-2 , the discharging mechanism 5 includes a collection box 51 and a auger 53. The lower end of the box body 1 is fixedly connected with the collection box 51. The inside of the collection box 51 is communicated with the inside of the box body 1. A second rotating shaft 52 is rotatably connected inside the collection box 51. A auger 53 is fixedly connected to the side wall of the second rotating shaft 52. The left end of the collection box 51 is fixedly connected with a first motor 54. The output shaft end of the first motor 54 is fixedly connected with the left end of the second rotating shaft 52.

[0044] In this embodiment, the ground materials are collected by the collection box 51. Then, the first motor 54 is started to drive the second rotating shaft 52 to rotate. The rotation of the second rotating shaft 52 drives the auger 53 to rotate, so as to drive the materials inside the collection box 51 to move to the right, thereby achieving the effect of discharging materials.

[0045] In a further embodiment, referring to Figure 8 , the dredging mechanism 6 includes a cam 62 and a knocking block 65. The upper end of the box body 1 is rotatably connected to a transmission shaft 61 through a bearing seat. The side wall of the transmission shaft 61 is fixedly connected with cams 62 at equal intervals. A push rod 67 is arranged at the upper end of the box body 1. The side wall of the push rod 67 abuts against the side wall of the cam 62. The right end of the push rod 67 is fixedly connected with a lifting frame 64. The lower end of the lifting frame 64 penetrates into the box body 1 and is slidably connected to the wall of the box body 1. A spring 66 is fixedly connected inside the lower side of the lifting frame 64. The upper end of the spring 66 is fixedly connected to the inner wall of the box body 1. The lower end of the lifting frame 64 is fixedly connected with a knocking block 65.

[0046] In this embodiment, by starting the second motor 63 to drive the transmission shaft 61 to rotate, the rotation of the transmission shaft 61 drives the cam 62 to rotate. The rotating cam 62 drives the push rod 67 to move upward. The upward-moving push rod 67 drives the lifting frame 64 to move upward, thereby compressing the spring 66. When the push rod 67 detaches from the convex block point on the side wall of the cam 62, the push rod 67 cancels the abutment, and under the condition that the spring 66 restores its deformation, it instantly drives the knocking block 65 to move downward and knock on the screening cylinder 2. Since there are multiple groups of cams 62, and there is a certain angle between the convex blocks on the side walls of adjacent cams 62, the knocking block 65 can continuously knock on the screening cylinder 2, and generate vibration through high-frequency knocking, so as to dredge the screening holes in the screening cylinder 2.

[0047] The working principle of the present invention is as follows: By starting the servo motor 7 to drive the first rotating shaft 31 to rotate, the rotation of the first rotating shaft 31 drives the grinding roller 32 to rotate. While the first rotating shaft 31 is rotating, it drives the first gear 41 to rotate. The rotation of the first gear 41 drives the second gear 42 to rotate. The rotation of the second gear 42 drives the gear ring 43 to rotate. The rotation of the gear ring 43 drives the tooth 45 to move. The movement of the tooth 45 drives the third gear 223 to rotate. The rotation of the third gear 223 drives the rotating shaft 221 to rotate. The rotation of the rotating shaft 221 drives the baffle 222 to rotate, so that a moving angle is formed between the baffle 222 and the inner wall of the screening cylinder 2. While the gear ring 43 is rotating, it drives the limit block 44 to move. When the limit block 44 moves to the end of the limit groove 211 and abuts against it, it drives the fixing ring 21 to rotate. The rotation of the fixing ring 21 drives the screening cylinder 2 to rotate. Thus, the rotating screening cylinder 2 cooperates with the baffle 222 to move the materials at the bottom. When the materials move to the upper end of the extension part 35, the materials will automatically fall from the upper end of the baffle 222 due to gravity and be collected by the extension part 35. The collected materials are preliminarily ground by the grinding roller 32 and the second grinding side plate 34. While the screening roller is rotating, the materials are moved from left to right through the arranged guide plate. Thus, the materials can be evenly placed on the grinding roller 32 for grinding;

[0048] When the materials are preliminarily ground and move to the right side of the screening cylinder 2, at this time, start the servo motor 7 to drive the first rotating shaft 31 to rotate in the reverse direction, and then drive the gear ring 43 to rotate in the reverse direction, so that the tooth 45 and the limit block 44 move in the opposite direction, and then drive the baffle 222 to rotate in the reverse direction. Thus, the materials at the bottom of the screening cylinder 2 move to the extension part 35 again for collection. The materials collected by the extension part 35 are ground twice by the grinding roller 32 and the first grinding side plate 33, making the grinding more refined. The materials ground twice fall into the interior of the box body 1 through the screening holes in the screening cylinder 2 and are collected by the collection box 51. Then, by starting the first motor 54 to drive the second rotating shaft 52 to rotate, the rotation of the second rotating shaft 52 drives the auger 53 to rotate, so as to push the ground materials to the right, achieving the effect of discharging materials;

[0049] During the grinding work, by starting the second motor 63 to drive the transmission shaft 61 to rotate, the rotation of the transmission shaft 61 drives the cam 62 to rotate. The rotating cam 62 drives the ejector rod 67 to move upward. The upward moving ejector rod 67 drives the lifting frame 64 to move upward, thereby squeezing the spring 66. When the ejector rod 67 detaches from the convex block point on the side wall of the cam 62, the ejector rod 67 cancels the abutment, and under the condition that the spring 66 resumes deformation, it instantly drives the knocking block 65 to move downward and knock on the screening cylinder 2. Since there are multiple groups of cams 62, and there is a certain angle between the convex blocks on the side walls of the adjacent cams 62, the knocking block 65 can continuously knock on the screening cylinder 2, and generate vibration through high-frequency knocking, thereby dredging the screening holes in the screening cylinder 2.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bio-based material grinding device, comprising a housing (1), characterized in that: Positioning plates (11) are fixedly connected to the left and right ends of the box body (1), a screening cylinder (2) is rotatably connected between the outer walls of the two sets of positioning plates (11), a grinding mechanism (3) is arranged inside the screening cylinder (2), and the grinding mechanism (3) is connected to the screening cylinder (2) through a transmission mechanism (4), a discharging mechanism (5) is arranged at the lower end of the box body (1), and a dredging mechanism (6) is arranged at the upper end of the box body (1); The grinding mechanism (3) comprises a grinding roller (32) and a grinding side plate. A first rotating shaft (31) is rotatably connected between the two groups of positioning plates (11). Both ends of the first rotating shaft (31) extend through the outside of the box (1). The side wall of the first rotating shaft (31) is fixedly connected to the grinding roller (32). A first grinding side plate (33) and a second grinding side plate (34) are fixedly connected between the two groups of positioning plates (11). The first grinding side plate (33) is located at the front end of the grinding roller (32), and the second grinding side plate (34) is located at the rear end of the grinding roller (32). A servo motor (7) is fixedly connected to the left end of the box (1). The output shaft end of the servo motor (7) is fixedly connected to the left end of the first rotating shaft (31). The screening cylinder (2) is provided with material turning assemblies (22) at equal intervals inside, the material turning assemblies (22) comprising a rotating shaft (221) and a baffle (222), the left and right ends of the screening cylinder (2) are fixedly connected to fixing rings (21), the two sets of fixing rings (21) are equidistantly connected to the rotating shaft (221), the side wall of the rotating shaft (221) is fixedly connected to the baffle (222), and a transmission mechanism (4) is provided inside the positioning plate (11) located at the left end of the screening cylinder (2); The transmission mechanism (4) comprises a first gear (41) and a second gear (42); the first rotating shaft (31) is fixedly connected to the side wall thereof; the second gear (42) is rotatably connected to the interior of a positioning plate (11) located at the left end of the screening drum (2); the first gear (41) meshes with the second gear (42); the inner wall of the fixing ring (21) is rotatably connected to a gear ring (43); the gear ring (43) meshes with the second gear (42); the inner wall of the fixing ring (21) is provided with a limiting groove (211) and a first receiving groove (212) at equal intervals; the outer wall of the gear ring (43) is fixedly connected to a limiting block (44) at equal intervals; the limiting block (44) is located inside the limiting groove (211) and is slidably connected thereto; A second receiving groove (213) is provided inside the first receiving groove (212); the left end of the rotating shaft (221) penetrates into the second receiving groove (213); a third gear (223) is fixedly connected to the side wall of the rotating shaft (221); the third gear (223) is located inside the second receiving groove (213); teeth (45) are equidistantly arranged on the outer wall of the gear ring (43); the teeth (45) and the third gear (223) are meshed with each other; The upper ends of the first grinding side plate (33) and the second grinding side plate (34) are both fixedly connected with extension parts (35), and the two groups of extension parts (35) are in the shape of an inverted "eight"; The distance between the side wall of the grinding roller (32) and the side wall of the first grinding side plate (33) is smaller than the distance between the side wall of the grinding roller (32) and the side wall of the second grinding side plate (34); Guide blocks (23) are fixedly connected to the interior of the screening cylinder (2) at equal intervals.

2. A bio-based material grinding device according to claim 1, characterized in that: The material discharge mechanism (5) comprises a collection box (51) and an auger (53); the lower end of the box body (1) is fixedly connected to the collection box (51); the interior of the collection box (51) is communicated with the interior of the box body (1); a second rotating shaft (52) is rotatably connected to the interior of the collection box (51); the side wall of the second rotating shaft (52) is fixedly connected to the auger (53); the left end of the collection box (51) is fixedly connected to a first motor (54); and the output shaft end of the first motor (54) is fixedly connected to the left end of the second rotating shaft (52).

3. The bio-based material grinding device according to claim 1, characterized in that: The dredging mechanism (6) comprises a cam (62) and a knocking block (65); the upper end of the box body (1) is rotatably connected to a transmission shaft (61) via a bearing seat; the side wall of the transmission shaft (61) is equidistantly fixedly connected to the cam (62); the upper end of the box body (1) is provided with a push rod (67); the side wall of the push rod (67) abuts against the side wall of the cam (62); the right end of the push rod (67) is fixedly connected to a lifting frame (64); the lower end of the lifting frame (64) penetrates into the interior of the box body (1) and is slidably connected to the wall of the box body (1); the lower side of the lifting frame (64) is fixedly connected to a spring (66); the upper end of the spring (66) is fixedly connected to the inner wall of the box body (1); and the lower end of the lifting frame (64) is fixedly connected to the knocking block (65).

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