Waste plastic recovery equipment

Abstract

The invention belongs to the field of plastic recycling, and particularly relates to waste plastic recycling equipment which comprises a rack, a driving motor device, a smashing box body, a rotary smashing device and a re-chopping device, the front side face of the smashing box body is slidably connected with a horizontally-arranged reciprocating chopping device, and the reciprocating chopping device inwards extends into the smashing box body; an arc-shaped sieve plate is fixedly connected to the lower end of the crushing box body, a cutting device slidably connected to the crushing box body is arranged on the outer side of the arc-shaped sieve plate, the rotary crushing device comprises a rotary main shaft, the rotary main shaft is rotationally connected into the crushing box body, and crushing cutter devices which are arranged in a staggered mode are fixedly connected to the rotary main shaft; a belt wheel and a rotating disc are fixedly connected to the two ends of the rotating main shaft, the belt wheel and the rotating disc are in transmission connection with the reciprocating chopping device through a connecting rod, and the cutting device is in transmission connection with the rotating disc. The recovery efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of plastic recycling, and in particular relates to waste plastic recycling equipment. Background Art

[0002] The primary raw materials for plastic bag production include petroleum-based plastic resins, recycled plastics, and biodegradable materials. Petroleum-based plastic resins, also known as virgin plastics, are primarily derived from petrochemicals; biodegradable materials are fermented from plants like corn and sugarcane; and recycled plastics are made from recycled waste PE plastics (such as beverage bottles and used plastic bags) through cleaning, melting, and granulation. With increasingly stringent environmental protection requirements, recycled plastics are increasingly used in plastic bag production. Recycling waste plastics first requires cutting and shredding the plastic for later processing.

[0003] Chinese patent application number CN202323472715.0 discloses a PVC plastic production and recycling pulverization device, comprising a housing, a feed inlet at the top of the housing, a first drive assembly disposed within the housing, a pulverizing roller connected to the first drive assembly, a sloping plate fixedly attached to the inner wall of the housing, and evenly distributed filter holes disposed within the sloping plate, a discharge port disposed on the left side of the housing, an electric push rod fixedly attached to the inner wall of the housing, a push plate fixedly attached to the output end of the electric push rod, and a second drive assembly disposed on the left side of the housing. Through the linkage between a servo motor, a fixed shaft, gears, and the pulverizing roller, the servo motor is activated to rotate the rear fixed shaft, thereby rotating the rear gear, which in turn rotates the meshed front gear, thereby rotating the pulverizing roller, thereby pulverizing the PVC plastic. The above device pulverizes waste plastic solely through the pulverizing roller, resulting in poor pulverization and easy clogging, leading to low recycling efficiency. Furthermore, due to the high elasticity of waste plastic fragments, even with the push plate, waste plastic fragments can easily become stuck in the filter holes, affecting the operation of the device and reducing work efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a waste plastic recycling device to address the deficiencies of the prior art.

[0005] To achieve the above purpose, the specific technical solutions of the present invention are as follows: A waste plastic recycling device comprises a frame, a driving motor device, a crushing box, a rotary crushing device and a re-shredding device, wherein the crushing box is fixedly mounted on the upper end of the frame, the front side of the crushing box is connected to a side mounting plate, a horizontally arranged reciprocating shredder is slidably connected to the side mounting plate, and the reciprocating shredder extends inwardly into the crushing box, and the lower end of the crushing box is fixedly connected to an arc sieve plate, the outer side of the arc sieve plate is provided with a sliding rod fixedly mounted on the inner wall of the crushing box and parallel to the central axis of the arc sieve plate, and a cutting device is slidably connected to the sliding rod, and the rotary crushing device comprises a rotating main shaft, which is rotatably connected to the crushing box and is parallel to the arc sieve plate. The shaped screen plate is coaxial with the central axis, and the rotating main shaft is fixedly connected with a staggered crushing and cutting knife device, and the two ends of the rotating main shaft are fixedly connected with a pulley and a rotating disk, and the first eccentric shaft and the second eccentric shaft are symmetrically arranged on the outer sides of the pulley and the rotating disk. The pulley is connected to the driving motor device through a transmission belt, and the reciprocating chopping device is connected to the first eccentric shaft and the second eccentric shaft through a connecting rod, and the cutting device is connected to the rotating disk. The driving motor device drives the rotating main shaft to rotate through the transmission belt, and the pulley, crushing and cutting knife device and the rotating disk rotate synchronously, driving the reciprocating chopping device to move back and forth, and the rotating disk drives the cutting device to move back and forth.

[0006] As a further arrangement of the above scheme, the upper end of the crushing box is fixedly connected to a feeding port, the lower end of the crushing box is fixedly connected to a unloading port, the outer end of the side mounting plate is fixedly connected to a vertical downward connecting vertical plate, the lower end surface of the side mounting plate is fixedly connected to a reinforcing bracket, and a guide sleeve is fixedly installed on the connecting vertical plate.

[0007] As a further configuration of the above scheme, the crushing and cutting device includes a tool holder, which is fixedly mounted on the rotating main shaft, and a circumferentially distributed material guide plate is fixedly connected to the tool holder, and a linearly arranged rotating cutter is fixedly connected to the outer side of the material guide plate, and the cutting edge of the rotating cutter faces downward, and the first eccentric shaft and the second eccentric shaft are eccentrically arranged on the pulley and the rotating disk, and a wavy arc-shaped groove is provided on the outer edge of the inner side surface of the rotating disk.

[0008] As a further configuration of the above scheme, the reciprocating shredding device includes a sliding guide plate, which is slidably connected to the crushing box and the reinforcing bracket. One side of the sliding guide plate is fixedly connected to a linearly arranged reciprocating cutter, the cutting edge of the reciprocating cutter faces upward, and the reciprocating cutter and the rotary cutter are arranged crosswise and staggered. The other side of the sliding guide plate is fixedly connected to a vertically arranged mounting bracket plate.

[0009] As a further arrangement of the above scheme, a spring column device is fixedly connected to one side of the mounting bracket plate, and the other end of the spring column device is fixedly connected to the crushing box body. A guide column is fixedly connected to the other side of the mounting bracket plate, and the guide column is slidably connected to the guide sleeve. The outer end of the guide column is fixedly connected to a driving column parallel to the rotating main shaft, and both ends of the driving column are hinged to the connecting rod, and the other ends of the two connecting rods are hinged to the first eccentric shaft and the second eccentric shaft respectively, and the two connecting rods are symmetrically arranged.

[0010] As a further arrangement of the above scheme, the arc-shaped sieve plate is provided with evenly distributed sieve holes, and the cutting device includes symmetrically arranged two side square columns, guide holes are provided in the side square columns, and the guide holes are slidably connected to the slide rod, and evenly arranged arc-shaped plates are fixedly connected between the two side square columns, and the arc-shaped plates are concentric with the arc-shaped sieve plate, and a cutting blade is provided on the upper end surface of the arc-shaped plate, and the cutting blade slides against the outer wall of the arc-shaped sieve plate.

[0011] As a further arrangement of the above scheme, the lower end of the arc plate is fixedly connected to a reinforcing column, the upper end of the reinforcing column has a large chamfer, a connecting rod is fixedly installed on one side of the reinforcing column, the connecting rod is slidably connected to the crushing box, the outer end of the connecting rod is fixedly connected to the limiting plate, a return spring is sleeved on the connecting rod, the return spring is located outside the crushing box, one end of the return spring is fixedly connected to the limiting plate, and the other end of the return spring is fixedly connected to the crushing box.

[0012] As a further arrangement of the above scheme, a mounting column is fixedly connected to the outer surface of the limit plate, and a top ball is rotatably connected to the outer end of the mounting column. Under the action of a reset spring, the top ball rolls and abuts against the wavy arc-shaped slide groove.

[0013] Beneficial effects of the present invention: Waste plastics are fed into the crushing box through the feeding port, and the driving motor device drives the pulley to rotate through the transmission belt, and the pulley drives the rotating main shaft and the rotating disk to rotate synchronously, and the crushing cutter device rotates synchronously in the crushing box. At the same time, the first eccentric shaft and the second eccentric shaft on the outer side of the pulley and the rotating disk drive the sliding guide plate to move back and forth through the connecting rod, thereby driving the reciprocating cutter to move back and forth on one side of the rotating cutter. The rotating cutter and the reciprocating cutter cooperate with each other to cut the waste plastics into pieces. In addition, the rotary cutter can circulate the waste plastics and repeatedly crush the waste plastics, which not only improves the crushing effect, but also prevents blockage and greatly improves the recycling efficiency.

[0014] When the rotating disk rotates, the top ball and the wavy arc-shaped slide groove are always in rolling contact, driving the side column to move back and forth on the slide rod, and the cutting blade and the outer wall of the arc-shaped screen plate to move back and forth. When the shredded plastic passes through the sieve hole, the cutting blade performs secondary shredding, screening the waste plastic while further improving the crushing effect, while avoiding the problem of sieve hole blockage, ensuring the normal operation of the equipment and improving the working efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 It is a schematic diagram of the appearance of the present invention; Figure 3 This is a first schematic diagram of the crushing box of the present invention; Figure 4 This is a second schematic diagram of the crushing box of the present invention; Figure 5 It is a schematic diagram of the assembly of the rotary crushing device and the reciprocating shredding device of the present invention; Figure 6 This is a first schematic diagram of the rotary crushing device of the present invention; Figure 7 This is a second schematic diagram of the rotary crushing device of the present invention; Figure 8 It is a schematic diagram of the reciprocating shredding device of the present invention; Figure 9 Schematic diagram of the cutting device of the present invention.

[0016] Frame; 2. Drive motor device; 201. Drive belt; 3. Crushing box; 301. Feeding port; 302. Discharging port; 303. Side mounting plate; 304. Connecting vertical plate; 3041. Guide sleeve; 305. Reinforcement bracket; 306. Slide rod; 4. Rotating crushing device; 401. Rotating main shaft; 402. Pulley; 4021. First eccentric shaft; 403. Rotating disk; 4031. Wave arc chute; 4032. Second eccentric shaft; 404. Crushing cutter device; 4041. Knife holder; 4042. Guide plate; 4043. Rotating Rotary cutter; 5. Reciprocating chopping device; 501. Sliding guide plate; 5011. Mounting bracket plate; 5012. Spring column device; 502. Reciprocating cutter; 503. Guide column; 504. Driving column; 5041. Connecting rod; 6. Arc-shaped sieve plate; 601. Sieve hole; 7. Cutting device; 701. Side column; 7011. Guide hole; 702. Arc-shaped plate; 7021. Cutting blade; 703. Reinforcing column; 7031. Large chamfer; 704. Connecting rod; 7041. Limiting plate; 705. Return spring; 706. Mounting column; 707. Top bead. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Figures 1 to 9 The present application is described in detail with reference to embodiments.

[0019] The present embodiment discloses a waste plastic recycling device, including a frame 1, a drive motor device 2, a crushing box 3, a rotary crushing device 4 and a complex shredding device 5. The crushing box 3 is fixedly mounted on the upper end of the frame 1, and the front side of the crushing box 3 is connected to a side mounting plate 303. A horizontally arranged reciprocating shredding device 5 is slidably connected to the side mounting plate 303. The reciprocating shredding device 5 extends inwardly into the crushing box 3. An arc-shaped screen plate 6 is fixedly connected to the lower end of the crushing box 3. A sliding rod 306 is fixedly mounted on the outer side of the arc-shaped screen plate 6 and parallel to the central axis of the arc-shaped screen plate 6. A cutting device 7 is slidably connected to the sliding rod 306. The rotary crushing device 4 includes a rotating main shaft 401, which is rotatably connected to the crushing box 3 and is coaxial with the arc-shaped screen plate 6. The rotating main shaft 4 01 is fixedly connected with an alternately arranged crushing and cutting device 404, and the two ends of the rotating main shaft 401 are fixedly connected with a pulley 402 and a rotating disk 403. The first eccentric shaft 4021 and the second eccentric shaft 4032 are symmetrically arranged on the outer surfaces of the pulley 402 and the rotating disk 403. The pulley 402 is connected to the driving motor device 2 through a transmission belt 201, and the reciprocating shredding device 5 is connected to the first eccentric shaft 4021 and the second eccentric shaft 4032 through a connecting rod 5041. The cutting device 7 is connected to the rotating disk 403. The driving motor device 2 drives the rotating main shaft 401 to rotate through the transmission belt 201, and the pulley 402, the crushing and cutting device 404 and the rotating disk 403 rotate synchronously, driving the reciprocating shredding device 5 to move back and forth, and the rotating disk 403 drives the cutting device 7 to move back and forth.

[0020] like Figure 2 、 Figure 3 、 Figure 4 As shown, the upper end of the crushing box 3 is fixedly connected to the feeding port 301, the lower end of the crushing box 3 is fixedly connected to the unloading port 302, the side mounting plate 303 is horizontally arranged, the outer end of the side mounting plate 303 is fixedly connected to the vertical connecting plate 304 pointing downward, the lower end surface of the side mounting plate 303 is fixedly connected to the reinforcing bracket 305, and the connecting vertical plate 304 is fixedly installed with a guide sleeve 3041, and the guide sleeve 3041 is vertically arranged to the connecting vertical plate 304.

[0021] like Figure 5 、 Figure 6 、 Figure 7As shown, the crushing cutter device 404 includes a tool holder 4041, which is fixedly mounted on the rotating main shaft 401, and a circumferentially distributed material guide plate 4042 is fixedly connected to the tool holder 4041, and a linearly arranged rotating cutter 4043 is fixedly connected to the outer side of the material guide plate 4042, and the cutting edge of the rotating cutter 4043 faces downward, and the first eccentric shaft 4021 and the second eccentric shaft 4032 are eccentrically arranged on the pulley 402 and the rotating disk 403, and a wavy arc-shaped groove 4031 is provided on the outer edge of the inner side surface of the rotating disk 403.

[0022] like Figure 5 、 Figure 8 As shown, the reciprocating shredder device 5 includes a sliding guide plate 501, which is slidably connected to the pulverizing box 3 and the reinforcing bracket 305. The reinforcing bracket 305 plays a guiding role and improves the structural strength of the sliding guide plate 501. A linearly arranged reciprocating cutter 502 is fixedly connected to one side of the sliding guide plate 501. The cutting edge of the reciprocating cutter 502 faces upward. The reciprocating cutter 502 and the rotary cutter 4043 are arranged in an interlaced manner. The rotary cutter 4043 can not only shred the waste plastic, but also disturb the waste plastic on the arc-shaped screen plate 6. The rotary cutter 4043 drives the waste plastic to move upward. During the rotation, under the action of the guide plate 4042, the waste plastic is driven to contact the reciprocating cutter 502 again for cyclic crushing. The other side of the sliding guide plate 501 is fixedly connected to a vertically arranged mounting bracket plate 5011. One side of the mounting bracket plate 5011 A spring column device 5012 is fixedly connected, and the other end of the spring column device 5012 is fixedly connected to the crushing box 3. A guide column 503 is fixedly connected to the other side of the mounting bracket plate 5011. The guide column 503 is slidably connected to the guide sleeve 3041. The outer end of the guide column 503 is fixedly connected to a driving column 504 parallel to the rotating main shaft 401. Both ends of the driving column 504 are hinged to the connecting rod 5041. The other ends of the two connecting rods 5041 are hinged to the first eccentric shaft 4021 and the second eccentric shaft 4032 respectively. The two connecting rods 5041 are symmetrically arranged. The pulley 402 and the rotating disk 403 respectively drive the two connecting rods 5041 to perform connecting rod movement through the first eccentric shaft 4021 and the second eccentric shaft 4032, driving the driving column 504 to perform horizontal reciprocating motion, and driving the reciprocating cutter 502 to perform horizontal reciprocating movement, thereby cooperating with the rotating cutter 4043 to crush the waste plastic.

[0023] like Figure 4 、 Figure 9As shown, the curved sieve plate 6 is provided with evenly distributed sieve holes 601, and the cutting device 7 includes symmetrically arranged two side square columns 701, and the side square columns 701 are provided with guide holes 7011, and the guide holes 7011 are slidably connected to the slide rod 306. The two side square columns 701 are fixedly connected with evenly arranged curved plates 702, and the curved plates 702 are concentric with the curved sieve plate 6. The upper end surface of the curved plate 702 is provided with a cutting blade 7021, and the cutting blade 7021 is in sliding contact with the outer wall of the curved sieve plate 6.

[0024] The lower end of the arc plate 702 is fixedly connected to a reinforcing column 703, and the upper end of the reinforcing column 703 is provided with a large chamfer 7031. The large chamfer 7031 can prevent waste plastic from accumulating on the upper end surface of the reinforcing column 703. A connecting rod 704 is fixedly installed on one side of the reinforcing column 703. The connecting rod 704 is slidably connected to the crushing box 3. The outer end of the connecting rod 704 is fixedly connected to the limit plate 7041. A return spring 705 is sleeved on the connecting rod 704. The return spring 705 is located outside the crushing box 3. One end of the return spring 705 is fixed to the limit plate 7041. The other end of the return spring 705 is fixedly connected to the crushing box 3, and the outer surface of the limit plate 7041 is fixedly connected to the mounting column 706. The outer end of the mounting column 706 is rotatably connected to the top ball 707. Under the action of the return spring 705, the top ball 707 rolls and abuts against the wavy arc chute 4031. During the rotation of the wavy arc chute, the top ball 707 drives the arc plate 702 to slide back and forth on the outer wall of the arc screen plate 6. When the shredded plastic passes through the sieve hole 601, the cutting blade 7021 performs secondary shredding.

[0025] Working process: waste plastics are fed into the crushing box 3 through the feeding port 301, the driving motor device 2 drives the pulley 402 to rotate through the transmission belt 201, the pulley 402 drives the rotating main shaft 401 and the rotating disk 403 to rotate synchronously, the crushing cutter device 404 rotates synchronously in the crushing box 3, the first eccentric shaft 4021 and the second eccentric shaft 4032 on the outer side of the pulley 402 and the rotating disk 403 drive the sliding guide plate 501 to move back and forth through the connecting rod 5041, thereby driving the reciprocating cutter 502 to move back and forth on one side of the rotating cutter 4043, and the rotating cutter 4043 is rotated back and forth. 43 and the reciprocating cutter 502 cooperate with each other to shred the waste plastic, which not only improves the shredding effect, but also prevents the plastic from being blocked on the rotating cutter 4043 and the reciprocating cutter 502. The shredded waste plastic follows the rotating cutter 4043 and falls onto the arc-shaped screen plate 6. At the same time, the rotating cutter 4043 circulates and moves large pieces of waste plastic. The rotating cutter 4043 drives the large pieces of waste plastic upward. During the rotation process, under the action of the guide plate 4042, the large pieces of waste plastic are driven to contact the reciprocating cutter 502 again for cyclic crushing, thereby cyclically crushing the waste plastic.

[0026] When small pieces of plastic are on the arc-shaped screen plate 6, they are screened under the disturbance of the rotating cutter 4043. During the rotation of the rotating disk 403, under the action of the reset spring 705, the top ball 707 rolls and abuts against the wavy arc-shaped groove 4031. During the rotation of the wavy arc-shaped groove, under the action of the top ball 707, the arc plate 702 is driven to slide back and forth on the outer wall of the arc-shaped screen plate 6. When small pieces of plastic pass through the sieve hole 601, the cutting blade 7021 performs secondary shredding, which further improves the shredding effect and avoids the blockage problem of the sieve hole 601 on the arc-shaped screen plate 6.

[0027] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0028] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A waste plastic recycling device, comprising a frame, a drive motor device, a crushing box, a rotary crushing device and a re-shredding device, wherein the crushing box is fixedly mounted on the upper end of the frame, characterized in that: The eccentric shaft and the eccentric shaft are symmetrically arranged on the outer surface of the pulley and the outer surface of the pulley are symmetrically arranged, and the pulley is connected to the driving motor device through a transmission belt, and the reciprocating cutting device is connected to the rotating disk through a connecting rod.

2. The waste plastic recycling equipment according to claim 1, characterized in that: The upper end of the crushing box is fixedly connected to a feeding port, the lower end of the crushing box is fixedly connected to a feeding port, the outer end of the side mounting plate is fixedly connected to a vertical downward connecting vertical plate, the lower end surface of the side mounting plate is fixedly connected to a reinforcing bracket, and the connecting vertical plate is fixedly installed with a guide sleeve.

3. The waste plastic recycling equipment according to claim 2, characterized in that: The crushing and cutting device includes a tool holder, which is fixedly mounted on a rotating main shaft, and a circumferentially distributed material guide plate is fixedly connected to the tool holder, and a linearly arranged rotating cutter is fixedly connected to the outer side of the material guide plate, and the cutting edge of the rotating cutter faces downward, the first eccentric shaft and the second eccentric shaft are eccentrically arranged on the pulley and the rotating disk, and a wavy arc-shaped groove is provided on the outer edge of the inner side surface of the rotating disk.

4. The waste plastic recycling equipment according to claim 3, characterized in that: The reciprocating shredding device includes a sliding guide plate, which is slidably connected to the shredding box and the reinforcing bracket. One side of the sliding guide plate is fixedly connected to a linearly arranged reciprocating cutter, the cutting edge of the reciprocating cutter faces upward, and the reciprocating cutter and the rotary cutter are arranged crosswise and staggered. The other side of the sliding guide plate is fixedly connected to a vertically arranged mounting bracket plate.

5. The waste plastic recycling equipment according to claim 4, characterized in that: A spring column device is fixedly connected to one side of the mounting bracket plate, and the other end of the spring column device is fixedly connected to the crushing box body. A guide column is fixedly connected to the other side of the mounting bracket plate, and the guide column is slidably connected to the guide sleeve. The outer end of the guide column is fixedly connected to a driving column parallel to the rotating main shaft, and both ends of the driving column are hinged to the connecting rod, and the other ends of the two connecting rods are respectively hinged to the first eccentric shaft and the second eccentric shaft, and the two connecting rods are symmetrically arranged.

6. The waste plastic recycling equipment according to claim 1, characterized in that: The arc-shaped sieve plate is provided with evenly distributed sieve holes, and the cutting device includes two symmetrically arranged square columns, with guide holes provided in the side square columns, which are slidably connected to the slide rod, and evenly arranged arc-shaped plates are fixedly connected between the two side square columns, and the arc-shaped plates are concentric with the arc-shaped sieve plate, and a cutting blade is provided on the upper end surface of the arc-shaped plate, and the cutting blade slides against the outer wall of the arc-shaped sieve plate.

7. The waste plastic recycling equipment according to claim 6, characterized in that: The lower end of the arc plate is fixedly connected to a reinforcing column, and the upper end of the reinforcing column has a large chamfer. A connecting rod is fixedly installed on one side of the reinforcing column. The connecting rod is slidably connected to the crushing box. The outer end of the connecting rod is fixedly connected to the limit plate. A return spring is sleeved on the connecting rod. The return spring is located outside the crushing box. One end of the return spring is fixedly connected to the limit plate, and the other end of the return spring is fixedly connected to the crushing box.

8. The waste plastic recycling equipment according to claim 7, characterized in that: A mounting column is fixedly connected to the outer side surface of the limit plate, and a top ball is rotatably connected to the outer end of the mounting column. Under the action of a reset spring, the top ball rolls and abuts against the wave arc-shaped sliding groove.

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