Cleaning and recycling system for waste paper strips of corrugated board production line

Abstract

The invention discloses a cleaning and recycling system for waste paper strips of a corrugated paper board production line, and belongs to the technical field of waste paper cleaning and recycling. Comprising a cutting and conveying module, a crushing and sorting module, a negative pressure recycling module and a compaction forming module. The cutting and conveying module comprises a corrugated board cutting machine, a climbing frame, a flow guide funnel and a conveying assembly, the crushing and sorting module comprises a crushing assembly and an inclined airflow channel, the negative pressure recycling module comprises a paper suction assembly, and the paper suction assembly conveys shredded paper to the compaction forming module through negative pressure airflow; the compaction forming module comprises a compaction assembly, the conveying assembly comprises a multi-stage conveying belt and a flow guide plate, and the multi-stage conveying belt guides waste paper strips to the inclined airflow channel through a flow guide funnel. According to the cleaning and recycling system for the waste paper strips of the corrugated paper board production line, the waste paper strips generated by the production line are collected, accumulation pollution is avoided, the manual cleaning cost is reduced, and the waste paper is crushed into fiber crushed materials which are directly reused for production or serve as regenerated raw materials to be sold.

Description

Technical Field

[0001] The present invention relates to the technical field of waste paper cleaning and recycling, and particularly to a cleaning and recycling system for waste paper strips in a corrugated cardboard production line. Background Art

[0002] Corrugated cardboard, also known as corrugated board, is composed of at least one layer of corrugated paper and one layer of box board paper (also called box board paper) bonded together, and has good elasticity and extensibility. It is mainly used for manufacturing cartons, the sandwich of cartons, and other packaging materials for fragile goods. When producing corrugated cardboard, after the corrugated cardboard is formed, it also needs to be cut and preliminarily processed into a certain shape for subsequent processing to make corrugated cartons. Some waste cardboard will be generated after the corrugated cardboard is cut. The generation of these waste cardboard is likely to interfere with the operation of the equipment and even cause potential safety hazards. If the waste paper strips are not cleaned in time, they will accumulate, affecting the workshop environment and also hindering the next processing step. Currently, most of them use traditional manual methods to clean the waste paper strips. The traditional manual methods require a large amount of manpower and material resources, with low work efficiency and high processing costs. Therefore, a cleaning and recycling system for waste paper strips in a corrugated cardboard production line is needed. Summary of the Invention

[0003] The purpose of the present invention is to provide a cleaning and recycling system for waste paper strips in a corrugated cardboard production line, which collects the waste paper strips generated by the production line, avoids accumulation and pollution, reduces the manual cleaning cost, uses air flow and machinery to cooperate for sorting, accurately removes impurities such as metal and plastic, improves the purity of recycled materials, crushes the waste paper into fiber fragments, compresses them into high-density blocks, and directly reuses them in production or sells them as recycled raw materials.

[0004] The present invention provides a cleaning and recycling system for waste paper strips in a corrugated cardboard production line, including a cutting and conveying module, a crushing and sorting module, a negative pressure recovery module, and a compaction and forming module; the cutting and conveying module includes a corrugated cardboard cutting machine, a climbing frame, a diversion funnel, and a conveying component, the crushing and sorting module includes a crushing component and an inclined air flow channel, the negative pressure recovery module includes a paper suction component, and the paper suction component conveys the shredded paper to the compaction and forming module through negative pressure air flow; the compaction and forming module includes a compaction component, and the conveying component includes a multi-stage conveyor belt and a diversion plate, and the multi-stage conveyor belt guides the waste paper strips to the inclined air flow channel through the diversion funnel.

[0005] Preferably, the crushing component includes a feed inlet, a crushing chamber, and a second collection box. A double-roll knife mechanism is provided in the crushing chamber. The double-roll knife mechanism includes a coarse crushing blade and a fine crushing blade. The feed inlet is provided at the top of the crushing chamber. The feed inlet is connected to the end of the inclined air flow channel through a bellows. The second collection box is located below the crushing chamber; the paper suction component includes a main negative pressure pipeline, branch pipelines, a suction fan, and an electric air valve. The main negative pressure pipeline is connected to the inclined air flow channel through the branch pipelines. The compaction component includes a lead screw slider mechanism and a detachable base.

[0006] Preferably, the multi-stage conveyor belts in the conveying component include a corrugated cardboard conveyor belt, a first conveyor belt, a second conveyor belt, and a third conveyor belt. The first conveyor belt and the second conveyor belt are symmetrically arranged on both sides of the cutting machine and the climbing frame. The third conveyor belt is located between the first conveyor belt and the second conveyor belt, and the height of the third conveyor belt is lower than that of the first conveyor belt and the second conveyor belt.

[0007] Preferably, the inclined air flow channel includes spiral guiding ribs arranged on the inner wall. A waste discharging port is provided at the bottom of the inclined air flow channel. The waste discharging port is connected to a slidable first collection box through a ball rail, and a spring bolt is provided at the end of the ball rail.

[0008] Preferably, the double-roller knife mechanism includes a driving roller knife and a driven roller knife. The driving roller knife is installed with coarse crushing blades, and the driven roller knife is installed with fine crushing blades. The driving roller knife drives the driven roller knife to rotate in the opposite direction through a driving gear, and heat dissipation pipes are provided on the outer wall of the crushing chamber.

[0009] Preferably, the main negative pressure pipe is a spiral air duct, and the branch pipes bifurcate from the side wall of the main negative pressure pipe and extend to the outlet of the inclined air flow channel.

[0010] Preferably, the lead screw slider mechanism includes a servo motor, a lead screw, a slider, a slide rail, a fixing block, a fixing seat, a connecting rod, and a pressing block. The servo motor is connected to the lead screw. A fixing seat is provided at the bottom of the lead screw. Slide rails parallel to the lead screw are provided on both sides of the lead screw. A slider is provided on the slide rail. The slider is fixedly connected to the nut seat on the lead screw. The movement of the nut seat drives the slider to move on the slide rail. Fixing seats are provided outside the slider and the nut seat, and the fixing seats are connected to the pressing block through two connecting rods.

[0011] Therefore, the present invention adopts the above-mentioned waste paper strip cleaning and recycling system for a corrugated cardboard production line, collects the waste paper strips generated by the production line, avoids accumulation and pollution, reduces the manual cleaning cost, sorts the air flow and machinery synergistically, accurately removes impurities such as metals and plastics, improves the purity of the recycled materials, crushes the waste paper into fiber fragments, compacts them into high-density blocks, and directly reuses them in production or sells them as recycled raw materials.

[0012] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0013] Figure 1 It is the overall schematic diagram of a waste paper strip cleaning and recycling system for a corrugated cardboard production line of the present invention; Figure 2 It is the structural schematic diagram of the crushing chamber of a waste paper strip cleaning and recycling system for a corrugated cardboard production line of the present invention; Figure 3Schematic diagram of the structure of the conveying component of the waste paper strip cleaning and recycling system for a corrugated cardboard production line according to the present invention; Figure 4 Schematic diagram of the structure of the compaction component of the waste paper strip cleaning and recycling system for a corrugated cardboard production line according to the present invention; Figure 5 Schematic diagram of the structure of the paper suction component of the waste paper strip cleaning and recycling system for a corrugated cardboard production line according to the present invention.

[0014] Reference numerals 1. Corrugated cardboard cutting machine; 2. Climbing frame; 3. Corrugated cardboard conveyor belt; 4. Transmission gap; 5. First conveyor belt; 6. Second conveyor belt; 7. Third conveyor belt; 8. Diversion funnel; 9. Inclined air flow channel; 10. Ball screw rail; 11. First collection box; 12. Spring bolt; 13. Bellows; 14. Feed inlet; 15. Crushing chamber; 16. Second collection box; 17. Main negative pressure pipeline; 18. Branch pipeline; 19. Exhaust fan; 20. Electric air valve; 21. Lead screw slider mechanism; 22. Detachable base; 23. Servo motor; 24. Lead screw; 25. Fixed seat; 26. Slide rail; 27. Fixed block; 28. Connecting rod; 29. Pressing block; 30. Active roller cutter; 31. Driven roller cutter; 32. Coarse crushing blade; 33. Fine crushing blade; 34. Heat dissipation pipe; 35. Guide plate; 36. Discharge port. Detailed implementation manners

[0015] The technical solutions of the present invention will be further described below with reference to the drawings and embodiments.

[0016] Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs.

[0017] The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0018] Embodiment 1 As Figures 1-5As shown in the figure, a waste paper strip cleaning and recycling system for a corrugated cardboard production line according to the present invention includes a cutting and conveying module, a crushing and sorting module, a negative pressure recovery module, and a compaction and forming module; the cutting and conveying module includes a corrugated cardboard cutting machine 1, a climbing frame 2, a diversion funnel 8, and a conveying assembly. The crushing and sorting module includes a crushing assembly and an inclined air flow channel 9 for crushing waste paper strips and separating impurities. The negative pressure recovery module includes a paper suction assembly, and the paper suction assembly conveys shredded paper to the compaction and forming module through negative pressure air flow; the compaction and forming module includes a compaction assembly for compressing shredded paper into block-shaped recycled materials. The conveying assembly includes a multi-stage conveyor belt and a guide plate 35, and the multi-stage conveyor belt guides waste paper strips to the inclined air flow channel 9 through the diversion funnel 8. The inclined air flow channel 9 separates shredded paper from impurities through air flow sorting.

[0019] The crushing assembly includes a feed inlet 14, a crushing chamber 15, and a second collection box 16. A double-roller knife mechanism is provided in the crushing chamber 15, and the double-roller knife mechanism includes a coarse crushing blade 32 and a fine crushing blade 33. The feed inlet 14 is provided at the top of the crushing chamber 15, and the feed inlet 14 is connected to the end of the inclined air flow channel 9 through a corrugated pipe 13. The second collection box 16 is located below the crushing chamber 15 for temporarily storing the shredded paper after crushing.

[0020] The paper suction assembly includes a main negative pressure pipe 17, a branch pipe 18, a suction fan 19, and an electric air valve 20. The main negative pressure pipe 17 is connected to the inclined air flow channel 9 through the branch pipe 18. The compaction assembly includes a screw slider mechanism 21 and a detachable base 22, and compresses the shredded paper through linear pressure.

[0021] The multi-stage conveyor belt in the conveying assembly includes a corrugated cardboard conveyor belt 3, a first conveyor belt 5, a second conveyor belt 6, and a third conveyor belt 7. The first conveyor belt 5 and the second conveyor belt 6 are symmetrically arranged on both sides of the corrugated cardboard cutting machine 1 and the climbing frame 2. The third conveyor belt 7 is located between the first conveyor belt 5 and the second conveyor belt 6, and the height of the third conveyor belt 7 is lower than that of the first conveyor belt 5 and the second conveyor belt 6.

[0022] The inclined air flow channel 9 includes spiral guiding ribs provided on the inner wall for guiding the air flow to form a vortex. A waste discharge port is provided at the bottom of the inclined air flow channel 9, and the waste discharge port is connected to a slidable first collection box 11 through a ball rail 10. A spring bolt 12 is provided at the end of the ball rail 10 for fixing the position of the first collection box 11. The inclined air flow channel 9 is connected to the first collection box 11 through a flange, and a high-temperature resistant silica gel gasket is clamped between the flanges, and polyurethane sealant is coated on the outer edge.

[0023] The double-roller knife mechanism includes a driving roller knife 30 and a driven roller knife 31. The driving roller knife 30 is installed with a coarse crushing blade 32, and the driven roller knife 31 is installed with a fine crushing blade 33. The driving roller knife 30 drives the driven roller knife 31 to rotate in the opposite direction through a driving gear, and a heat dissipation pipe 34 is provided on the outer wall of the crushing chamber 15.

[0024] The main negative pressure pipe 17 is a spiral air duct. Turbine blades are arranged inside the paper suction assembly to enhance the airflow stability. The branch pipe 18 bifurcates from the side wall of the main negative pressure pipe 17 and extends to the outlet of the inclined air flow channel 9.

[0025] The lead screw slider mechanism 21 includes a servo motor 23, a lead screw 24, a slider, a slide rail 26, a fixed block 27, a fixed seat 25, a connecting rod 28, and a pressing block 29. The servo motor 23 is connected to the lead screw 24, and the bottom of the lead screw 24 is provided with a fixed seat 25. Slide rails 26 parallel to the lead screw 24 are arranged on both sides of the lead screw 24, and sliders are arranged on the slide rails 26. The slider is fixedly connected to the nut seat on the lead screw 24. The movement of the nut seat drives the slider to move on the slide rail 26. Fixed seats 25 are arranged outside the slider and the nut seat, and the fixed seats 25 are connected by two connecting rods 28 and a pressing block 29.

[0026] Working principle: The corrugated cardboard is cut by the corrugated cardboard cutting machine 1 and transported to the climbing frame 2 through the corrugated cardboard conveyor belt 3. Since there is a transmission gap 4 on the corrugated cardboard conveyor belt 3, the impurities of the corrugated cardboard fall onto the first conveyor belt 55 and the second conveyor belt 6. Since the heights of the first conveyor belt 55 and the second conveyor belt 6 are greater than that of the third conveyor belt 7 and there is a guide plate 35, the impurities move onto the third conveyor belt 7. The third conveyor belt 7 is connected to the inclined air flow channel 9 through a diversion funnel 8, and the inclined air flow channel 9 is connected to the feed port 14 of the crushing assembly through a bellows 13.

[0027] Inside the crushing assembly, there are a feed port 14, a crushing chamber 15, and a second collection box 16. The second collection box 16 is connected to the paper suction assembly through the main negative pressure pipe 17. A suction fan 19 is arranged inside the paper suction assembly. The main negative pressure pipe 17 is connected to the inclined air flow channel 9 through a branch pipe 18. Therefore, a waste discharge port is arranged at the bottom of the inclined air flow channel 9. The waste discharge port is connected to the slidable first collection box 11 through a ball slide rail 10, and a spring bolt 12 is arranged at the end of the ball slide rail 10. Through the cooperation of the branch pipe 18 and the electric air valve 20, the light impurities are sent to the feed port 14 in the crushing assembly through the inclined air flow channel 9, and the heavy impurities fall into the first collection box 11 through the waste discharge port. After the light impurities reach the feed port 14 of the crushing assembly, they are crushed in the crushing chamber 15 and then put into the second collection box 16. The second collection box 16 is connected to the paper suction assembly through the main negative pressure pipe 17. A suction fan 19 is arranged inside the paper suction assembly. After the light impurities enter the paper suction assembly, they reach the base in the compaction assembly through a pipe.

[0028] The lead screw 24 is connected to the servo motor 23. A nut seat is provided in the middle of the lead screw 24, and a fixed seat 25 is provided at the end of the lead screw 24. Slide rails 26 are arranged in parallel on both sides of the lead screw 24. Sliders are provided on the slide rails 26, and the sliders are fixedly connected to the nut seat. A fixed block 27 is provided above the slider and the nut seat. A connecting rod 28 is provided below the fixed block 27. The fixed block 27 is connected to the pressing block 29 through two connecting rods 28, and the pressing block 29 compacts the light impurities.

[0029] Waste collection and primary screening: After the corrugated cardboard cutting machine 1 completes the corrugated cardboard forming operation, waste paper strips and impurities naturally fall from both sides of the equipment. At this time, the symmetrically arranged first conveyor belt 5 and second conveyor belt 6 are immediately started. The friction resistance is increased through the special texture design on the surface to ensure that large-sized waste paper strips are stably captured. The third conveyor belt 7 located between the first conveyor belt 5 and the second conveyor belt 6 adopts a corrugated side structure, and the height of the side is dynamically adjusted according to the volume of the waste, which can not only prevent the material from spilling, but also avoid the risk of blockage caused by excessive accumulation. The third conveyor belt 7 runs at a low speed, and the end of the third conveyor belt 7 is connected to the diversion funnel 8. The inside of the diversion funnel 8 is provided with multiple layers of buffer plates distributed in a staggered manner, which preliminarily disperses by changing the falling trajectory of the waste, reduces the caking phenomenon, and creates a uniform feeding condition for the subsequent air separation.

[0030] Air separation and impurity separation: The waste sorted by the diversion funnel 8 enters the inclined air channel 9. The inclined air channel 9 is constructed of composite materials, and spiral guide ribs are embedded in the inner wall of the inclined air channel 9. The surface of the spiral guide ribs is polished to reduce the friction coefficient. When the system is started, the blower forms a stable air flow field in the inclined air channel 9. The light shredded paper is suspended and moved under the action of the air lift, while heavy impurities such as metal and plastic slide along the bottom of the inclined air channel 9 due to the action of gravity.

[0031] The spiral ribs guide the air flow to form a controllable vortex, prolong the residence time of the shredded paper in the separation area, and improve the separation accuracy. An adjustable impurity discharge port is provided at the bottom of the inclined air channel 9, and a ball slide rail 10 is installed at the bottom of the discharge port. A first collection box 11 with a spring bolt 12 is configured on the slide rail 26. When the impurities accumulate to the set threshold, the spring bolt 12 is automatically released, and the first collection box 11 moves out of the ball slide rail 10 along the slide rail 26, and the impurities are centrally dumped into the external recycling box. After the first collection box 11 is reset, the bolt locks the position, and the flange interface at the bottom of the inclined air channel 9 is double-sealed with a high-temperature resistant silica gel gasket and polyurethane sealant to prevent air leakage.

[0032] Multi-stage Crushing and Particle Size Control: The shredded paper after sorting is conveyed to the crushing assembly through the corrugated pipe 13. There is a feed inlet 14 at the top of the crushing chamber 15, and a double-roll collaborative crushing mechanism is configured inside the crushing chamber 15. Coarse crushing blades 32 are installed on the surface of the driving roll cutter 30, which is responsible for the primary tearing of the shredded paper; the driven roll cutter 31 is equipped with coarse crushing blades 32 to further pulverize the material after primary crushing. The two rolls rotate in reverse synchronously through the gear set, and the blade transmission gap 4 can be electrically adjusted according to the required particle size of the recycled material.

[0033] During the crushing process, high temperature is generated at the contact surface between the crushing blade and the material. The 34-way annular heat dissipation pipe nested on the outer wall of the crushing chamber 15 maintains a constant temperature through circulating coolant. The crushed shredded paper falls into the second collection box 16 at the bottom. The second collection box 16 adopts an airtight design to prevent the shredded paper from getting damp and caking. The outlet of the second collection box 16 is seamlessly docked with the main negative pressure pipeline 17. When the material volume in the second collection box 16 reaches the preset level, the automatic valve opens, and the shredded paper enters the next link.

[0034] Negative Pressure Adsorption and Pipeline Transmission: The main negative pressure pipeline 17 is a spiral air duct, and turbine guide vanes are embedded in the inner wall of the main negative pressure pipeline 17 to reduce the turbulent loss by optimizing the air flow path. The main negative pressure pipeline 17 is connected to the branch pipeline 18. The branch pipeline 18 adopts a tapered design to form a Venturi effect at the pipe diameter change, enhancing the local negative pressure adsorption force. Electric air valves 20 are set at the key nodes of the pipeline.

[0035] Linear Compaction and Modular Molding: After the shredded paper is conveyed to the compaction assembly through the pipeline via the discharge port 36, it falls into the detachable base 22. The inside of the detachable base 22 is a rectangular cavity, and the four walls are treated with a high-hardness coating to prevent material adhesion. The compaction assembly is driven by a screw-slider mechanism 21. The servo motor 23 drives the precision ball screw 24 to rotate through the coupling, driving the slider to press vertically along the linear slide rail 26. An alloy pressing head is installed at the bottom of the slider, and the surface of the pressing block 29 is processed with anti-slip texture to ensure uniform pressure transmission.

[0036] The compaction process is divided into three stages: pre-pressing, main pressing, and pressure holding. In the pre-pressing stage, the shredded paper transmission gap 4 is eliminated at a low speed. In the main pressing stage, a constant pressure is applied to densify the material. In the pressure holding stage, the pressure is maintained until the shredded paper fibers complete plastic deformation.

[0037] Therefore, the present invention adopts the above-mentioned waste paper strip cleaning and recycling system for a corrugated board production line, collects the waste paper strips generated by the production line, avoids accumulation and pollution, reduces the manual cleaning cost, sorts the air flow and machinery synergistically, accurately removes impurities such as metal and plastic, improves the purity of the recycled material, crushes the waste paper into fiber fragments, compacts them into high-density blocks, and directly reuses them in production or sells them as recycled raw materials.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the present invention or make equivalent substitutions, and these modifications or equivalent substitutions cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A waste paper strip cleaning and recycling system for a corrugated cardboard production line, characterized in that, It includes a cutting and conveying module, a crushing and sorting module, a negative pressure recovery module and a compaction and forming module; the cutting and conveying module includes a corrugated cardboard cutting machine, a climbing frame, a diversion funnel and a conveying component, the crushing and sorting module includes a crushing component and an inclined air flow channel, the negative pressure recovery module includes a paper suction component, and the paper suction component conveys shredded paper to the compaction and forming module through negative pressure air flow; the compaction and forming module includes a compaction component, the conveying component includes a multi-stage conveyor belt and a diversion plate, and the multi-stage conveyor belt guides waste paper strips to the inclined air flow channel through the diversion funnel.

2. The waste paper strip cleaning and recycling system for a corrugated cardboard production line according to claim 1, characterized in that, The crushing component includes a feed inlet, a crushing chamber and a second collection box. A double-roller knife mechanism is provided in the crushing chamber. The double-roller knife mechanism includes a coarse crushing blade and a fine crushing blade. The feed inlet is provided at the top of the crushing chamber. The feed inlet is connected to the end of the inclined air flow channel through a corrugated pipe. The second collection box is located below the crushing chamber; the paper suction component includes a main negative pressure pipe, a branch pipe, a suction fan and an electric air valve. The main negative pressure pipe is connected to the inclined air flow channel through the branch pipe. The compaction component includes a screw rod slider mechanism and a detachable base.

3. The waste paper strip cleaning and recycling system for a corrugated cardboard production line according to claim 1, characterized in that, The multi-stage conveyor belt in the conveying component includes a corrugated cardboard conveyor belt, a first conveyor belt, a second conveyor belt and a third conveyor belt. The first conveyor belt and the second conveyor belt are symmetrically arranged on both sides of the cutting machine and the climbing frame. The third conveyor belt is located between the first conveyor belt and the second conveyor belt. The height of the third conveyor belt is lower than that of the first conveyor belt and the second conveyor belt.

4. The waste paper strip cleaning and recycling system for a corrugated cardboard production line according to claim 1, wherein, The inclined air flow channel includes spiral guide ribs provided on the inner wall. A waste discharge port is provided at the bottom of the inclined air flow channel. The waste discharge port is connected to a slidable first collection box through a ball rail. A spring bolt is provided at the end of the ball rail.

5. The cleaning and recycling system for waste paper strips of a corrugated cardboard production line according to claim 2, characterized in that, The double-roller knife mechanism includes a driving roller knife and a driven roller knife. The driving roller knife is installed with a coarse crushing blade, and the driven roller knife is installed with a fine crushing blade. The driving roller knife drives the driven roller knife to rotate in the opposite direction through a driving gear. Heat dissipation pipes are provided on the outer wall of the crushing chamber.

6. The waste paper strip cleaning and recycling system for a corrugated cardboard production line according to claim 2, wherein, The main negative pressure pipe is a spiral air pipe. The branch pipe bifurcates from the side wall of the main negative pressure pipe and extends to the outlet of the inclined air flow channel.

7. The cleaning and recycling system for waste paper strips of a corrugated cardboard production line according to claim 2, characterized in that, The screw rod slider mechanism includes a servo motor, a screw rod, a slider, a slide rail, a fixed block, a fixed seat, a connecting rod and a pressing block. The servo motor is connected to the screw rod. A fixed seat is provided at the bottom of the screw rod. Slide rails parallel to the screw rod are provided on both sides of the screw rod. A slider is provided on the slide rail. The slider is fixedly connected to the nut seat on the screw rod. The movement of the nut seat drives the slider to move on the slide rail. Fixed seats are provided outside the slider and the nut seat. The fixed seats are connected to the pressing block through two connecting rods.

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