Food processing production equipment with automatic cleaning function
By working in conjunction with an automatic cleaning mechanism, the problem of difficult-to-clean meat residue on the surface of the conveyor rollers is solved, achieving efficient cleaning, reducing manual operation, and ensuring equipment hygiene and food safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG SENJIA FOOD CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-05-19
AI Technical Summary
In existing meat processing equipment, it is difficult to automatically clean meat residue on the surface of the conveyor rollers. Relying on manual operation is inefficient and consumes a lot of time and labor costs.
An automatic cleaning food processing equipment was designed. The equipment uses a ring guide rail to drive a sliding block, which in turn drives a brush and a spray pipe to clean the surface of the conveying roller. Combined with a motor-driven disc transmission, the brush and spray can work together to clean the surface. An automatic liquid replenishment mechanism ensures the supply of cleaning liquid, and a sieve plate collects residues and facilitates regular cleaning.
It improves cleaning efficiency, reduces the frequency of manual operation, ensures cleaning effect, saves labor costs, guarantees the hygiene of equipment, and improves food processing safety and quality.
Smart Images
Figure CN224257623U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of food processing equipment technology, and in particular to a food processing production equipment with an automatic cleaning function. Background Technology
[0002] Meat products refer to the edible parts of various animals (such as pigs, cattle, sheep, chickens, ducks, etc.) and meat products. It includes fresh raw meat, such as pork chunks and beef slices, which are rich in nutrients such as protein, fat, vitamins, and minerals.
[0003] Meat processing equipment refers to the various mechanical devices used in the process of processing meat products from the initial handling after animal slaughter to the final finished product. For example, in the initial processing stage, there are slaughtering equipment such as slaughtering knives and dehairing machines, used to slaughter and initially process animals. In the cutting and processing stage, there are meat slicers, meat grinders, and other equipment that can cut large pieces of meat into suitable sizes or grind them into minced meat. For transportation during processing, conveying equipment such as conveyor rollers is used.
[0004] In the food processing industry, especially in meat processing, conveyor rollers are an indispensable component of production lines, used to transport cut and processed ingredients such as chicken. However, during the conveying process, meat residue easily adheres to the surface of the conveyor rollers. Traditional cleaning methods often rely on manual operation, using simple cleaning tools such as brushes. Manual cleaning is inefficient, consumes a lot of time and labor costs, and it is difficult to ensure that every corner is thoroughly cleaned. Therefore, a food processing production equipment with an automatic cleaning function is proposed to solve the above problems. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides a food processing production equipment with automatic cleaning function, which aims to improve the problem that meat residue from food ingredients easily adheres to the surface of the conveyor rollers, resulting in low efficiency of manual cleaning and requiring a lot of time and labor costs.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A food processing production equipment with automatic cleaning function includes a base, side plates are fixedly connected to both the front and rear sides of the base, a cleaning mechanism is fixedly connected to the outside of the rear side plate, an automatic liquid filling mechanism is fixedly connected to the top of the rear side plate, and a disassembly and assembly mechanism is slidably connected to the inside of the front side plate.
[0008] The cleaning mechanism includes an annular guide rail. The inner wall of the annular guide rail is fixedly connected to the outside of the rear side plate. A sliding block is slidably connected to the outer wall of the annular guide rail. A driving component is fixedly connected to the bottom end of the sliding block. A push plate is fixedly connected to the front side of the driving component. A fixed plate is fixedly connected to the bottom end of the driving component. Multiple spray pipes are rotatably connected inside the fixed plate. A connecting pipe is fixedly connected to the adjacent side of two spray pipes. Multiple grooves are opened on the top of the push plate. An infusion pipe is fixedly connected to the top of the multiple spray pipes on the left side. A water spraying component is fixedly connected to the input end of the infusion pipe.
[0009] As a further description of the above technical solution:
[0010] The driving assembly includes a fixed housing, the top of which is fixedly connected to the bottom of the sliding block. A motor is fixedly connected inside the fixed housing, a disk is fixedly connected to the driving end of the motor, a fixed rod is fixedly connected inside the disk, a transmission plate is rotatably connected to the bottom of the fixed rod, a concave slider is rotatably connected to the front side of the transmission plate, and a connecting plate is fixedly connected to the front side of the concave slider.
[0011] As a further description of the above technical solution:
[0012] The rear side of the push plate is fixedly connected to the front side of the connecting plate, the top side of the fixed plate is fixedly connected to the bottom side of the fixed shell, the top inner wall of the fixed shell is fixedly connected to an I-shaped groove, and the outer wall of the concave slider is slidably connected to the inner wall of the I-shaped groove.
[0013] As a further description of the above technical solution:
[0014] The outer wall of the connecting pipe is in contact with the inner wall of the groove. Multiple brushes are fixedly connected to the bottom end of the fixing plate. Multiple conveying rollers are rotatably connected to the adjacent side of the two side plates. The bottom side of the multiple brushes is in contact with the outer wall of the multiple conveying rollers.
[0015] As a further description of the above technical solution:
[0016] The automatic liquid filling mechanism includes a water tank, the bottom of which is fixedly connected to the top of the rear side plate. A liquid storage bladder is fixedly connected to the inner wall of the top of the water tank. A rotating plate is rotatably connected to the inner wall of the water tank. A sliding plate is slidably connected to the inner wall of the rotating plate. A top block is fixedly connected to the top of the sliding block. The top outer wall of the top block is in contact with the bottom outer wall of the sliding plate.
[0017] As a further description of the above technical solution:
[0018] The water spray assembly includes a water pump, the front of which is fixedly connected to the input end of the infusion pipe, the bottom end of which is fixedly connected to the top of the water tank, the rear end of which is fixedly connected to an inlet pipe, the input end of which is fixedly connected to the inside of the water tank, and the rear side of the water tank is fixedly connected to a water injection pipe.
[0019] As a further description of the above technical solution:
[0020] The disassembly and assembly mechanism includes a sieve plate, the outer wall of which is slidably connected to one side of the two side plates. A square groove is provided on the front side of the sieve plate. A sliding rod is slidably connected inside the front side plate. A locking block is fixedly connected to the rear side of the sliding rod. A square plate is fixedly connected to the outside of the sliding rod. A spring is sleeved on the outside of the locking block. A pulling plate is fixedly connected to the front side of the sliding rod.
[0021] As a further description of the above technical solution:
[0022] The outer wall of the locking block engages with the inner wall of the square groove, the outer wall of the square plate is slidably connected to the inner wall of the front side plate, the rear side of the spring is fixedly connected to the front side of the locking block, the front side of the spring is fixedly connected to the front inner wall of the front side plate, and the rear side of the pulling plate is in contact with the front side of the front side plate.
[0023] This utility model has the following beneficial effects:
[0024] 1. In this utility model, the annular guide rail generates power to make the sliding block slide, which in turn drives the fixed shell and fixed plate to move left and right, allowing the brush to move left and right to clean the surface of the conveyor roller. At the same time, the motor drives the disc to rotate, and through a series of transmissions, the spray pipe rotates to scour the conveyor roller. The left and right movement of the brush to clean and the rotation of the spray pipe to scour work together. This multi-component collaborative work method can thoroughly clean the surface of the conveyor roller of meat particles, residues and other impurities, greatly improving cleaning efficiency and cleaning effect.
[0025] 2. In this utility model, the sliding block drives the top block to move left and right periodically. When the top block moves to the middle and squeezes the sliding plate, it will drive the rotating plate to rotate and squeeze the liquid storage bladder, and deliver the cleaning liquid into the water tank through the one-way valve. This automatically replenishes the cleaning liquid in the water tank, reduces the frequency of manual operation, saves labor costs, and ensures that there is enough cleaning liquid in the water tank during the cleaning process, thus ensuring the continuous progress of the cleaning work.
[0026] 3. In this utility model, the sieve plate is used to collect meat residue that falls off the conveyor roller after cleaning. When the residue is collected to a certain extent, the sliding rod is moved forward by pulling the pull plate, which causes the locking block to move forward and release from the square groove. The sieve plate can then be easily removed for cleaning. After cleaning, the sieve plate is slid into the side plate, and the locking block engages with the square groove under the action of the spring to achieve installation and fixation. This facilitates the regular cleaning of residue, ensures the hygiene of the equipment, and is beneficial to the safety and quality of food processing. Attached Figure Description
[0027] Figure 1 A perspective view of a food processing equipment with automatic cleaning function proposed in this utility model;
[0028] Figure 2 This is a schematic diagram of the structure of a conveyor roller in a food processing production equipment with automatic cleaning function proposed in this utility model.
[0029] Figure 3 for Figure 1 Enlarged view of point A in the middle;
[0030] Figure 4 This is a schematic diagram of the structure of the fixed shell of a food processing equipment with automatic cleaning function proposed in this utility model.
[0031] Figure 5 for Figure 2 Enlarged view of point B in the middle;
[0032] Figure 6 for Figure 2 A magnified view of point C in the middle.
[0033] Legend:
[0034] 1. Base; 2. Side plate; 3. Circular guide rail; 4. Sliding block; 5. Fixed shell; 6. Motor; 7. Disc; 8. Fixed rod; 9. Transmission plate; 10. Concave slider; 11. I-shaped groove; 12. Connecting plate; 13. Push plate; 14. Fixed plate; 15. Spray pipe; 16. Connecting pipe; 17. Brush; 18. Infusion pipe; 19. Top block; 20. Water tank; 21. Storage bladder; 22. Rotating plate; 23. Sliding plate; 24. Water pump; 25. Inlet pipe; 26. Water injection pipe; 27. Sieve plate; 28. Square groove; 29. Sliding rod; 30. Clamping block; 31. Square plate; 32. Spring; 33. Pulling plate; 34. Conveying roller. Detailed Implementation
[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0036] Example 1
[0037] Reference Figure 1 , Figure 3 and Figure 4A food processing production equipment with automatic cleaning function includes a base 1, which provides support for the entire production equipment. Side plates 2 are fixedly connected to both the front and rear sides of the base 1. Multiple conveying rollers 34 are rotatably connected to adjacent sides of the two side plates 2. The side plates 2 provide support for the conveying rollers 34, which convey cut chicken meat. A cleaning mechanism is fixedly connected to the outside of the rear side plate 2. The cleaning mechanism includes an annular guide rail 3, the inner wall of which is fixedly connected to the outside of the rear side plate 2. A sliding block 4 is slidably connected to the outer wall of the annular guide rail 3. The annular guide rail 3 generates its own power to provide a sliding track for the sliding block 4, allowing the sliding block 4 to slide stably along it. A drive assembly is fixedly connected to the bottom end of block 4. The drive assembly includes a fixed housing 5, the top end of which is fixedly connected to the bottom end of the sliding block 4. A motor 6 is fixedly connected inside the fixed housing 5. The fixed housing 5 provides an installation position for other components of the drive assembly. A disc 7 is fixedly connected to the drive end of the motor 6. A fixed rod 8 is fixedly connected inside the disc 7. A transmission plate 9 is rotatably connected to the bottom of the fixed rod 8. The rotation of the disc 7 causes the fixed rod 8 to rotate around it, thereby transmitting the power of the motor 6 to the fixed rod 8, which in turn drives the transmission plate 9 connected to it to rotate. A concave slider 10 is rotatably connected to the front side of the transmission plate 9. When the fixed rod 8 rotates, the transmission plate 9 rotates accordingly, thereby pushing the concave slider 10 to move. An I-shaped groove 11 is fixedly connected to the inner wall of the top of the fixed shell 5. The outer wall of the concave slider 10 is slidably connected to the inner wall of the I-shaped groove 11. The I-shaped groove 11 provides guidance for the concave slider 10, ensuring that the concave slider 10 can move back and forth repeatedly along a specific trajectory under the push of the transmission plate 9. A connecting plate 12 is fixedly connected to the front side of the concave slider 10. A push plate 13 is fixedly connected to the front side of the drive assembly. The rear side of the push plate 13 is fixedly connected to the front side of the connecting plate 12. The connecting plate 12 connects the concave slider 10 and the push plate 13, transmitting the forward and backward movement power of the concave slider 10 to the push plate 13. A fixed plate 14 is fixedly connected to the bottom end of the drive assembly. The top side of the fixed plate 14 is fixedly connected to... Attached to the bottom side of the fixed housing 5, the fixed plate 14 is rotatably connected to multiple spray pipes 15. A connecting pipe 16 is fixedly connected to the adjacent side of two spray pipes 15. Multiple grooves are opened on the top of the push plate 13. The outer wall of the connecting pipe 16 contacts the inner wall of the groove. Multiple brushes 17 are fixedly connected to the bottom end of the fixed plate 14. The bottom side of the multiple brushes 17 contacts the outer wall of multiple conveying rollers 34. The fixed plate 14 moves left and right with the fixed housing 5, driving the brushes 17 to move left and right to clean the surface of the conveying rollers 34. The spray pipes 15 rotate under the drive of the connecting pipes 16 to thoroughly rinse the surface of the conveying rollers 34. With the cleaning of the brushes 17, it can more effectively remove meat residue and other impurities from the surface of the conveying rollers 34.
[0038] Example 2
[0039] Reference Figure 2 , Figure 3 and Figure 4 An automatic liquid-filling mechanism is fixedly connected to the top of the rear side plate 2. The automatic liquid-filling mechanism includes a water tank 20, the bottom of which is fixedly connected to the top of the rear side plate 2. The water tank 20 is used to store water and provide a water source. A liquid storage bladder 21 is fixedly connected to the inner wall of the top of the water tank 20. The liquid storage bladder 21 is used to store cleaning fluid. A rotating plate 22 is rotatably connected to the inner wall of the water tank 20. A sliding plate 23 is slidably connected to the inner wall of the rotating plate 22. A top block 19 is fixedly connected to the top of the sliding block 4. The top outer wall of the top block 19 contacts the bottom outer wall of the sliding plate 23. When the sliding block 4 periodically moves left and right to the middle, the top block 19 will squeeze the sliding plate 23. The rotating plate 22 rotates under the drive of the sliding plate 23, squeezing the liquid storage bladder 21 from the rear. The cleaning fluid in the liquid storage bladder 21 is then transported into the water tank through a one-way valve. In part 20, the movement of the sliding plate 23 is converted into squeezing of the liquid storage bladder 21, thereby realizing the automatic addition of cleaning fluid to the water tank 20. The top of the multiple spray pipes 15 on the left side is fixedly connected to the infusion pipe 18. The input end of the infusion pipe 18 is fixedly connected to the water spray assembly, which includes a water pump 24. The front side of the water pump 24 is fixedly connected to the input end of the infusion pipe 18. The water pump 24 is used to draw water out of the water tank 20. The bottom end of the water pump 24 is fixedly connected to the top of the water tank 20. The rear end of the water pump 24 is fixedly connected to the inlet pipe 25. The inlet pipe 25 is the channel for the water pump 24 to draw water from the water tank 20. The input end of the inlet pipe 25 is fixedly connected to the inside of the water tank 20. The rear side of the water tank 20 is fixedly connected to the water injection pipe 26. The function of the water injection pipe 26 is to provide an inlet for manually adding water to the water tank 20.
[0040] Example 3
[0041] Reference Figure 2 and Figure 6The front side plate 2 has a sliding connection to a disassembly and assembly mechanism, which includes a sieve plate 27. The outer wall of the sieve plate 27 is slidably connected to the adjacent side of the two side plates 2. The sieve plate 27 is used to collect meat residue that falls off the conveyor roller 34 after cleaning. A square groove 28 is opened on the front side of the sieve plate 27. A sliding rod 29 is slidably connected to the inside of the front side plate 2. A locking block 30 is fixedly connected to the rear side of the sliding rod 29. The outer wall of the locking block 30 engages with the inner wall of the square groove 28. When the locking block 30 engages with the square groove 28, the sieve plate 27 is fixed inside the side plate 2, ensuring the stability of the sieve plate 27 during operation. A square plate 31 is fixedly connected to the outside of the sliding rod 29. The outer wall of the square plate 31 is slidably connected to the inner wall of the front side plate 2. When the sieve plate 27 is installed, the sieve plate 27 will squeeze the locking block 30, and at the same time drive the square plate 31 to squeeze the spring 32. The square plate 31 plays the role of transmitting pressure and assisting the movement of the locking block 30. A spring 32 is fitted around the outside of the locking block 30. The rear side of the spring 32 is fixedly connected to the front side of the locking block 30, and the front side of the spring 32 is fixedly connected to the inner front wall of the front side plate 2. Under the action of the spring 32, the locking block 30 engages with the square groove 28, thereby fixing the screen plate 27. When the sliding rod 29 moves it forward, it releases the engagement with the square groove 28, allowing the screen plate 27 to be removed for cleaning. A pull plate 33 is fixedly connected to the front side of the sliding rod 29. The rear side of the pull plate 33 contacts the front side of the front side plate 2. By pulling the pull plate 33, the sliding rod 29 can be moved forward, thereby releasing the engagement between the locking block 30 and the square groove 28, facilitating the removal of the screen plate 27 for cleaning. This is the operating component for disassembling and assembling the screen plate 27.
[0042] Working principle: The ring guide rail 3 generates power to drive the sliding block 4 to slide, which in turn moves the fixed shell 5 and the fixed plate 14 left and right. The left and right movement of the fixed plate 14 drives the brush 17 to move left and right and clean the surface of the conveyor roller 34. At this time, the motor 6 inside the fixed shell 5 generates power to drive the disc 7 to rotate. The rotation of the disc 7 drives the fixed rod 8 to rotate around it. The I-shaped groove 11 guides the concave slider 10, which in turn drives the transmission plate 9 to rotate and causes the concave slider 10 to move back and forth along the I-shaped groove 11. The back and forth movement of the concave slider 10, in conjunction with the connection plate 12 and the push plate 13, pushes the connecting pipe 16 in the groove, which drives the spray pipe 15 to rotate. This achieves a comprehensive rinsing of the surface of the conveyor roller 34 and improves the cleaning effect.
[0043] During the cleaning process of the conveyor roller 34, the sliding block 4 drives the top block 19 to move left and right periodically. When the sliding block 4 moves to the middle, the top block 19 will squeeze the sliding plate 23 to move it upward. The upward movement of the sliding plate 23 drives the front side of the rotating plate 22 to rotate upward. At this time, the rear side of the rotating plate 22 rotates downward and squeezes the liquid storage bladder 21. The squeezed liquid storage bladder 21 delivers the cleaning liquid into the water tank 20 through its internal one-way valve, thereby realizing the automatic addition of cleaning liquid to the inside of the water tank 20 and reducing manual operation.
[0044] Meat residue on the conveyor roller 34 is cleaned by the cleaning mechanism and falls onto the screen plate 27. After the residue is collected to a certain extent, the sliding rod 29 is moved forward by pulling the pull plate 33. The forward-moving sliding rod 29 moves the locking block 30 forward to release it from the square groove 28. At this time, the screen plate 27 can be easily removed for cleaning. After cleaning, the screen plate 27 is slid into the side plate 2. The screen plate 27 will squeeze the locking block 30 and at the same time drive the square plate 31 to squeeze the spring 32. When the screen plate 27 is fully inserted into the side plate 2, the locking block 30 will lose the squeezing of the screen plate 27 and move backward due to the pressure generated by the compression of the spring 32 and engage with the square groove 28, thereby realizing the installation and fixation of the screen plate 27.
[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A food processing production equipment with automatic cleaning function, comprising a base (1), characterized in that: The base (1) is fixedly connected to the front and rear sides with side plates (2), the rear side plate (2) is fixedly connected to the outside with a cleaning mechanism, the top of the rear side plate (2) is fixedly connected to an automatic liquid filling mechanism, and the front side plate (2) is slidably connected to a disassembly and assembly mechanism. The cleaning mechanism includes an annular guide rail (3), the inner wall of which is fixedly connected to the outside of the rear side plate (2), a sliding block (4) is slidably connected to the outer wall of the annular guide rail (3), a driving component is fixedly connected to the bottom end of the sliding block (4), a push plate (13) is fixedly connected to the front side of the driving component, a fixed plate (14) is fixedly connected to the bottom end of the driving component, a plurality of spray pipes (15) are rotatably connected inside the fixed plate (14), a connecting pipe (16) is fixedly connected to the adjacent side of two spray pipes (15), a plurality of grooves are opened on the top of the push plate (13), an infusion pipe (18) is fixedly connected to the top of the plurality of spray pipes (15) on the left side, and a water spraying component is fixedly connected to the input end of the infusion pipe (18).
2. The food processing production equipment with automatic cleaning function according to claim 1, characterized in that: The drive assembly includes a fixed shell (5), the top of which is fixedly connected to the bottom of the sliding block (4). A motor (6) is fixedly connected inside the fixed shell (5). A disc (7) is fixedly connected to the drive end of the motor (6). A fixed rod (8) is fixedly connected inside the disc (7). A transmission plate (9) is rotatably connected to the bottom of the fixed rod (8). A concave slider (10) is rotatably connected to the front side of the transmission plate (9). A connecting plate (12) is fixedly connected to the front side of the concave slider (10).
3. The food processing production equipment with automatic cleaning function according to claim 2, characterized in that: The rear side of the push plate (13) is fixedly connected to the front side of the connecting plate (12), the top side of the fixing plate (14) is fixedly connected to the bottom side of the fixing shell (5), the top inner wall of the fixing shell (5) is fixedly connected to the I-shaped groove (11), and the outer wall of the concave slider (10) is slidably connected to the inner wall of the I-shaped groove (11).
4. The food processing production equipment with automatic cleaning function according to claim 1, characterized in that: The outer wall of the connecting pipe (16) is in contact with the inner wall of the groove. Multiple brushes (17) are fixedly connected to the bottom end of the fixing plate (14). Multiple conveying rollers (34) are rotatably connected to the adjacent side of the two side plates (2). The bottom side of the multiple brushes (17) is in contact with the outer wall of the multiple conveying rollers (34).
5. The food processing production equipment with automatic cleaning function according to claim 1, characterized in that: The automatic liquid filling mechanism includes a water tank (20), the bottom of which is fixedly connected to the top of the rear side plate (2), a liquid storage bladder (21) is fixedly connected to the top inner wall of the water tank (20), a rotating plate (22) is rotatably connected to the inner wall of the water tank (20), a sliding plate (23) is slidably connected to the inner wall of the rotating plate (22), a top block (19) is fixedly connected to the top of the sliding block (4), and the top outer wall of the top block (19) is in contact with the bottom outer wall of the sliding plate (23).
6. The food processing production equipment with automatic cleaning function according to claim 5, characterized in that: The water spraying assembly comprises a water pump (24), the front side of the water pump (24) is fixedly connected to the input end of the liquid conveying pipe (18), the bottom end of the water pump (24) is fixedly connected to the top end of the water tank (20), the rear end of the water pump (24) is fixedly connected with a liquid inlet pipe (25), the input end of the liquid inlet pipe (25) is fixedly connected to the inside of the water tank (20), and the rear side of the water tank (20) is fixedly connected with a water injection pipe (26).
7. The food processing production equipment with automatic cleaning function according to claim 1, characterized in that: The disassembling mechanism comprises a sieve plate (27), the outer wall of the sieve plate (27) is slidably connected to the side of the two side plates (2), the front side of the sieve plate (27) is provided with a square groove (28), the inside of the front side plate (2) is slidably connected with a sliding rod (29), the rear side of the sliding rod (29) is fixedly connected with a clamping block (30), the outside of the sliding rod (29) is fixedly connected with a square plate (31), the outside of the clamping block (30) is sleeved with a spring (32), and the front side of the sliding rod (29) is fixedly connected with a pulling plate (33).
8. The food processing production equipment with automatic cleaning function according to claim 7, characterized in that: The outer wall of the clamping block (30) is clamped with the inner wall of the square groove (28), the outer wall of the square plate (31) is slidably connected to the inner wall of the front side plate (2), the rear side of the spring (32) is fixedly connected to the front side of the clamping block (30), the front side of the spring (32) is fixedly connected to the front side inner wall of the front side plate (2), and the rear side of the pulling plate (33) is in contact with the front side of the front side plate (2).