A carton glue and tuck under device
By using a moving assembly with multiple motors and screws working in tandem and a metering pump to control the amount of glue, combined with a cardboard box clamping structure using an electric push rod and a hydraulic system, the shortcomings of traditional cardboard box gluing and folding equipment in three-dimensional positioning and glue quantity control are solved. This achieves a highly efficient and precise gluing and folding process, significantly improving production efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO XUSHENG PRINTING CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-06-05
AI Technical Summary
Traditional cardboard box gluing and folding equipment struggles to achieve three-dimensional positioning, resulting in uneven glue application, severe missed applications, and reliance on manual experience for glue quantity control. Furthermore, it is unstable in positioning irregularly shaped or variable-sized cardboard boxes, leading to a high defect rate.
The moving assembly employs multiple motors and screws working in tandem to achieve three-dimensional positioning and adjustment of the glue applicator. Combined with a metering pump to control the glue quantity, it is equipped with a multi-directional clamping structure to stabilize the cardboard box, including an electric push rod and a detachable contact plate. The hydraulic system controls the lifting and detachment of the cardboard box.
It achieves precise positioning of the glue applicator in three-dimensional space, ensuring uniform glue application, reducing uneven application and missed areas, improving production efficiency and equipment versatility, significantly reducing defect rate, and minimizing manual intervention and maintenance costs.
Smart Images

Figure CN224323660U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of paper box adhesive folding technology, and more specifically, to a paper box adhesive folding device. Background Technology
[0002] Packaging boxes are the most widely used packaging products, usually used as wrapping materials for goods or as outer protective layers for items. Depending on the materials used, there are corrugated boxes, single-layer cardboard boxes, etc., and they come in various specifications and models. Packaging boxes commonly have three or five layers, while seven-layer boxes are less common. Each layer consists of linerboard, corrugated paper, core paper, and face paper. Linerboard and face paper can be made of kraft paper or kraft paper, while the core paper is made of corrugated paper. The colors and textures of various types of paper are different, and the paper produced by different manufacturers is also different. As an indispensable part of modern logistics, especially with the rapid development of the express delivery industry, the use of packaging boxes is increasing.
[0003] Traditional folding equipment often uses a single-dimensional adjustment mechanism, making it difficult to position the glue applicator in three-dimensional space. This leads to uneven glue application and missed areas when folding cartons of different sizes. Furthermore, glue quantity control relies heavily on manual experience, lacking a quantitative delivery system, resulting in glue waste and affecting the stability of adhesive strength. In addition, existing devices have a simple positioning and clamping structure for cartons, only suitable for standard sizes. When dealing with irregularly shaped or varying-sized cartons, unstable positioning often leads to folding angle deviations, resulting in a high defect rate.
[0004] This invention makes the device more convenient and efficient to use. Utility Model Content
[0005] The present invention aims to solve the technical problems mentioned in the background art and provide a paper box gluing and folding device.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a paper box gluing and folding device, comprising: a base, a support first and a support second provided on the upper end of the base, a pressure groove provided on the upper end of the base, a movable assembly provided on the side of the support first and inside the base, a limit plate connected to a slide rail on one side of the support first, an adhesive applicator installed inside the limit plate, a pressure plate provided at the bottom of the support second, and a control box installed on one side of the base;
[0007] The moving assembly includes a motor and a screw, with one end of the screw mounted on the motor output.
[0008] A further preferred embodiment: one of the movable components is mounted on the outer side of the bracket, the screw passes through the rear end protrusion of the limiting plate, and the screw and the limiting plate are connected by a thread.
[0009] A further preferred embodiment: another motor is mounted on the upper end of the limiting plate, and a movable seat is nested on the outer surface of the glue applicator. The screw penetrates the movable seat and is embedded in the inner wall of the limiting plate, and the screw and the limiting plate are movably connected, while the screw and the movable seat are threadedly connected.
[0010] A further preferred embodiment: a motor of the moving assembly is mounted on the side of the base, the side of the base has a limiting groove, the screw can penetrate the base and be embedded in the inner wall of the limiting groove, a slider is fixedly installed on the inner side of the bracket, the slider can be embedded in the limiting groove, and the slider and the limiting groove are slidably connected, the screw can penetrate both ends of the slider, and the screw and the slider are threadedly connected.
[0011] A further preferred embodiment: a connecting pipe is embedded in the top of the glue applicator, and a storage tank is connected to the other end of the connecting pipe. A metering pump is installed between the connecting pipe and the storage tank.
[0012] A further preferred embodiment: Several positioning groups are installed on the upper end of the base. Each positioning group includes a positioning plate, an electric telescopic rod, and a clamping plate. The bottom of the positioning plate is fixedly installed on the upper surface of the base. One end of the electric telescopic rod is installed on the inner side of the positioning plate, and the output end of the electric telescopic rod is fixedly installed on one side of the clamping plate. The clamping plate and the electric telescopic rod are detachably connected. Two of the positioning groups are installed at the upper edge of the base, and three of the positioning groups are installed on the outer side of the pressure groove. The inner side of the clamping plate is made of rubber.
[0013] A further preferred embodiment: each of the inner walls of the pressing groove is embedded with an electric push rod, the output end of which is fixedly mounted with a push plate, the push plate being located inside the pressing groove, and the push plate being movably connected to the pressing groove.
[0014] A further preferred embodiment: a contact plate is slidably and detachably connected to the upper end of the push plate, a dovetail groove is provided on the upper end of the push plate, a dovetail block is fixedly installed at the bottom of the contact plate, the dovetail block can be embedded in the dovetail groove, and the dovetail block and the dovetail groove are slidably connected.
[0015] A further preferred embodiment: A hydraulic rod is fixedly installed on the upper end of the pressure plate, the top of the hydraulic rod is fixedly installed on the inner side of the bracket, and the pressure plate is located directly above the pressure groove. The pressure plate has a trapezoidal cross-section, and the bottom of the pressure plate is made of rubber.
[0016] A further preferred embodiment: a top plate is movably embedded at the bottom of the pressure groove, and a hydraulic rod two is fixedly installed at the bottom of the top plate, with the hydraulic rod two embedded inside the bottom of the pressure groove.
[0017] Beneficial effects:
[0018] 1. By incorporating a moving assembly, which utilizes multiple motors and screws in synergy, the device provides three-dimensional positioning and adjustment capabilities. The moving assembly mounted on the outer side of the support can drive the limiting plate to move horizontally along the slide rail, while the moving assembly at the top of the limiting plate controls the up-and-down movement of the glue applicator. Together, these two components enable precise positioning of the glue applicator in a two-dimensional plane. The moving assembly on the side of the base, connected to the slider via a screw, drives the support to move laterally, further expanding the adjustment range of the glue application position. This allows the glue applicator to be adjusted in three-dimensional space according to the size and folding position requirements of different sized cardboard boxes, ensuring that the glue is evenly applied to the folding area and avoiding uneven or missed application due to positioning deviations. At the same time, automated movement and adjustment reduce manual calibration steps, improve production efficiency, and are applicable to various specifications from small gift boxes to large industrial packaging boxes, significantly enhancing the device's versatility and adaptability.
[0019] 2. By incorporating a push plate, and combining it with an electric push rod and a contact plate, the positioning stability of the carton during processing is greatly enhanced. When the electric push rod on the inner wall of the pressure groove drives the push plate to move upward, the push plate, through the sliding connection structure of the dovetail groove and dovetail block, lifts the bottom of the carton, forming a multi-directional clamping with the clamping plate of the positioning group. This effectively prevents the carton from shifting during gluing and folding. The rubber material on the inner side of the contact plate provides sufficient friction to fix the carton while avoiding scratches on the carton surface, adapting to the packaging needs of different materials. In addition, the push plate and the contact plate are connected by a detachable dovetail groove. When the contact plate wears down due to long-term use, it can be quickly disassembled and replaced, reducing equipment maintenance costs. This structure, by controlling the lifting height of the push plate, ensures that the bottom of the carton remains horizontal with the pressure groove, providing a stable support base for the subsequent pressing and folding by the pressure plate, thereby improving the accuracy of the gluing process and the consistency of the folding quality, and significantly reducing the defect rate.
[0020] 3. By setting a top plate, the lifting height of the top plate can be controlled by a hydraulic system, making it easier and more stable for the carton to leave the pressure groove. The rubber material around the bottom of the pressure plate forms a buffer during the extrusion process, which not only ensures sufficient bonding pressure, but also protects the surface of the carton from damage, reduces manual intervention, and further improves production efficiency.
[0021] 4. In summary, this type of cardboard box gluing and folding device, through the inclusion of a moving assembly, achieves three-dimensional positioning of the glue applicator, adapting to various cardboard box specifications and improving gluing efficiency and accuracy. The push plate, linked to the contact plate, works with the positioning assembly to securely clamp the cardboard box from multiple directions. The detachable design facilitates maintenance, ensuring precise and stable gluing and folding, reducing the defect rate. The pressure plate folds the cardboard box, and the top plate allows the cardboard box to detach from the pressure groove, reducing manual intervention, improving product quality, significantly increasing production efficiency, and enhancing the device's practicality and market competitiveness. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0023] Figure 2 This is a schematic diagram of the connection structure between the movable assembly and the movable base of this utility model.
[0024] Figure 3 This is a schematic diagram of the pressure groove structure of this utility model.
[0025] Figure 4 This is a schematic diagram of the push plate and contact plate structure of this utility model.
[0026] Figure 1-4 In the middle: 1. Base; 101. Limiting groove; 2. Bracket 1; 201. Slider; 3. Bracket 2; 301. Pressure plate; 302. Hydraulic rod 1; 4. Pressure groove; 401. Electric push rod; 402. Push plate; 403. Contact plate; 404. Dovetail groove; 405. Dovetail block; 406. Top plate; 407. Hydraulic rod 2; 5. Moving group; 501. Motor; 502. Screw; 6. Limiting plate; 7. Glue applicator; 701. Moving seat; 702. Connecting pipe; 703. Storage tank; 8. Positioning group; 801. Positioning plate; 802. Electric telescopic rod; 803. Clamping plate. Detailed Implementation
[0027] The following will refer to the appendix in the embodiments of this utility model. Figures 1-4 The technical solutions in the embodiments of this utility model will be clearly and completely described.
[0028] Please see Figure 1-4In this embodiment of the utility model, a paper box adhesive folding device includes: a base 1, a bracket 2 and a bracket 3 on the upper end of the base 1, a pressure groove 4 on the upper end of the base 1, a moving assembly 5 on the side of the bracket 2 and inside the base 1, a limit plate 6 connected to a slide rail on one side of the bracket 2, an adhesive applicator 7 installed inside the limit plate 6, a pressure plate 301 at the bottom of the bracket 3, and a control box installed on one side of the base 1; the moving assembly 5 includes a motor 501 and a screw 502, one end of the screw 502 is installed at the output end of the motor 501. One of the movable components 5 is installed on the outside of the bracket 2. A screw 502 passes through the rear protrusion of the limiting plate 6, and the screw 502 is threadedly connected to the limiting plate 6. Another motor 501 is installed on the upper end of the limiting plate 6, and a movable seat 701 is nested on the outer surface of the glue applicator 7. The screw 502 passes through the movable seat 701 and is embedded in the inner wall of the limiting plate 6, with a movable connection between the screw 502 and the limiting plate 6, and a threaded connection between the screw 502 and the movable seat 701. The motor 501 of one of the movable components 5 is installed on the side of the base 1, and the side of the base 1 has an opening... The limiting groove 101 is provided with a screw 502 that can penetrate the base 1 and be embedded in the inner wall of the limiting groove 101. A slider 201 is fixedly installed on the inner side of the bracket 2. The slider 201 can be embedded in the limiting groove 101 and is slidably connected to the limiting groove 101. The screw 502 can penetrate both ends of the slider 201 and is threadedly connected to the slider 201. A connecting pipe 702 is embedded in the top of the glue applicator 7. The other end of the connecting pipe 702 is connected to a storage tank 703. A metering pump is installed between the connecting pipe 702 and the storage tank 703.
[0029] When the operator issues a work command through the control box, the motors 501 of each moving group 5 inside the device start immediately, driving the screws 502 to rotate at high speed as the core power source. Among them, the moving group 5 installed on the outside of the bracket 2 has its screw 502 penetrating through the rear end protrusion of the limiting plate 6. With the help of the threaded connection, the rotational motion of the screw 502 is converted into the horizontal linear movement of the limiting plate 6 along the slide rail, thereby realizing the position adjustment of the glue applicator 7 in the lateral dimension. The moving group 5 located at the upper end of the limiting plate 6 has its screw 502 penetrating through the moving seat 701 and embedded in the inner wall of the limiting plate 6. The screw 502 and the moving seat 701 are connected by a thread. The transmission system precisely controls the vertical lifting and lowering of the glue applicator 7, ensuring that the applicator 7 can flexibly adjust its working position according to changes in the height of the cardboard box, achieving precise positioning in a two-dimensional plane. Furthermore, the moving assembly 5 on the side of the base 1 also plays a crucial role. The motor 501 drives the screw 502 to rotate. Since the screw 502 penetrates the base 1 and is embedded in the inner wall of the limiting groove 101, and the slider 201 fixedly installed on the inner side of the bracket 2 can slide smoothly within the limiting groove 101, the threaded connection between the screw 502 and the slider 201 allows the bracket 2 to move laterally along the limiting groove 101, thereby achieving overall adjustment of the glue application area. The system is designed to adapt to the gluing needs of different sized cardboard boxes. In the gluing process, the connecting pipe 702 embedded at the top of the gluer 7 connects to the storage tank 703. A metering pump plays a crucial role between the two. Through flow control technology, the metering pump stably and quantitatively delivers the glue from the storage tank 703 to the gluer 7 according to the amount of glue required for folding the cardboard box. This ensures the glue is evenly applied to the folded area, avoiding both waste and contamination from excessive glue and weak adhesion from insufficient glue, thus completing the gluing process. The ingenious coordination of multiple motors 501 and the screw 502 enables the gluing position to be adjusted in three-dimensional space. The fine internal adjustment effectively improves the glue coating quality, whether for small and exquisite gift boxes. In terms of glue quantity control, the application of the metering pump allows the glue delivery volume to be set according to actual needs, which not only saves glue costs but also ensures stable bonding strength and significantly reduces the defect rate. In terms of structural design, it reduces manual operation links, lowers labor costs, and improves production speed. It is also more convenient for later maintenance, combining flexibility and practicality. It can bring significant economic benefits and production efficiency improvement to paper box packaging manufacturers. In this embodiment, the glue applicator 7 is a mature existing technology and will not be described in detail.
[0030] In this embodiment of the utility model, several positioning groups 8 are installed on the upper end of the base 1. The positioning group 8 includes a positioning plate 801, an electric telescopic rod 802, and a clamping plate 803. The bottom of the positioning plate 801 is fixedly installed on the upper surface of the base 1. One end of the electric telescopic rod 802 is installed on the inner side of the positioning plate 801, and the output end of the electric telescopic rod 802 is fixedly installed on one side of the clamping plate 803. The clamping plate 803 and the electric telescopic rod 802 are detachably connected. Two positioning groups 8 are installed at the upper edge of the base 1, and three positioning groups 8 are installed on the outer side of the pressure groove 4. The inner side of the clamping plate 803 is made of rubber. Electric push rods 401 are embedded in the inner wall of the pressure groove 4. A push plate 402 is fixedly installed on the output end of the electric push rod 401. The push plate 402 is located inside the pressure groove 4, and the push plate 402 is connected to the pressure groove 4. The pressure grooves 4 are movably connected; the upper end of the push plate 402 is slidably and detachably connected to the contact plate 403, the upper end of the push plate 402 is provided with a dovetail groove 404, the bottom of the contact plate 403 is fixedly installed with a dovetail block 405, the dovetail block 405 can be embedded in the dovetail groove 404, and the dovetail block 405 and the dovetail groove 404 are slidably connected; the upper end of the pressure plate 301 is fixedly installed with a hydraulic rod 302, the top of the hydraulic rod 302 is fixedly installed inside the bracket 3, and the pressure plate 301 is located directly above the pressure groove 4, the pressure plate 301 has a trapezoidal cross section, and the bottom of the pressure plate 301 is made of rubber; the bottom of the pressure groove 4 is movably embedded with a top plate 406, the bottom of the top plate 406 is fixedly installed with a hydraulic rod 407, and the hydraulic rod 407 is embedded in the bottom of the pressure groove 4;
[0031] After the glue is applied, the positioning group 8 located at the upper edge of the base 1 and outside the pressure groove 4 is activated, pushing the cardboard towards the pressure groove 4. After being pushed to the designated position, the electric telescopic rod 802 extends to push the inner rubber clamping plate 803, positioning and clamping the cardboard box from different directions to ensure the stability of the cardboard box during glue application and folding. At the same time, the electric push rod 401 on the inner wall of the pressure groove 4 drives the push plate 402 to move inward, thereby adjusting the width of the fold. The push plate 402, through the sliding connection structure between the dovetail groove 404 and the dovetail block 405, drives the detachable contact plate 403 to lift and fix the bottom of the cardboard box, further enhancing the positioning effect of the cardboard box. Then, the control box activates the hydraulic rod 302 inside the bracket 2 3. The hydraulic rod 302 inside the bracket 2 3 pushes the trapezoidal pressure plate 301 vertically downward. The rubber material around the bottom of the pressure plate 301 ensures that sufficient pressure is provided during the downward press. The device avoids damaging the cardboard box. After folding, the hydraulic rod 407 at the bottom of the pressure groove 4 drives the top plate 406 to lift upwards, allowing the cardboard to detach from the pressure groove 4 and enter the next process, making the device more efficient during folding. The positioning group 8 enables multi-directional positioning and stable clamping of the cardboard box. The rubber clamping plate 803 not only effectively prevents scratches on the surface of the cardboard box, but also adapts to cardboard boxes of different shapes and sizes, improving the device's versatility. The combination of the electric push rod 401 with the push plate 402 and contact plate 403 further enhances the cardboard box fixing effect, ensures the accuracy of the gluing and folding processes, and reduces the defect rate caused by cardboard box displacement. The detachable clamping plate 803 and contact plate 403 facilitate replacement and maintenance, reducing equipment maintenance costs. This allows the device to achieve a comprehensive improvement in automation, production efficiency, and product quality, better meeting the diverse and high-quality production needs of the cardboard box packaging industry.
[0032] Working Principle: When using this device, after the operator places the cardboard box on the base 1, the positioning group 8 located at the upper edge of the base 1 and outside the pressure groove 4 is activated first. The electric telescopic rod 802 extends and pushes the inner rubber clamping plate 803 to accurately position and clamp the cardboard box from different directions, preventing the cardboard box from shifting during subsequent processing. After positioning is completed, the operator issues a work command through the control box, and the motors 501 of each moving group 5 start, driving the screw 502 to rotate at high speed. The moving group 5 on the outside of the bracket 1 2 drives the limiting plate 6 to move horizontally along the slide rail, and the moving group 5 at the upper end of the limiting plate 6 controls the up and down movement of the glue applicator 7. The two work together to achieve precise positioning of the glue applicator 7 in a two-dimensional plane; the moving group 5 on the side of the base 1 drives the bracket 1 2 to move laterally, realizing the overall adjustment of the glue application area. The metering pump between the top connecting pipe 702 of the glue applicator 7 and the storage tank 703 delivers glue stably and quantitatively to the glue applicator 7 according to the amount of glue required for folding the cardboard box, ensuring that the area to be folded is evenly glued. After the gluing process is completed, the electric push rod 401 on the inner wall of the pressure groove 4 drives the push plate 402 to move inward. The width of the folded edge is adjusted by the cooperation of the push plate 402 and the contact plate 403, making the device more flexible in use. After the push plate 402 is adjusted, the hydraulic rod 302 on the inner side of the bracket 2 3 pushes the trapezoidal pressure plate 301 vertically downward. The rubber material around the bottom of the pressure plate 301 provides sufficient pressure while avoiding damage to the cardboard box. After the folding is completed, the push plate 402 retracts and resets, effectively preventing the pressure plate 301 from contacting the glue on the cardboard box folding edge and reducing the impact of the folding edge on the glue. At the same time, the hydraulic rod 407 at the bottom of the pressure groove 4 drives the top plate 406 to rise. The top plate 406 continues to rise and pushes the cardboard box out of the pressure groove 4, allowing it to enter the next process. The whole process is highly automated, and the components cooperate precisely, effectively improving the efficiency and quality of cardboard box gluing and folding.
Claims
1. A paper box adhesive folding device, comprising: The base (1) is characterized in that: a bracket (2) and a bracket (3) are provided on the upper end of the base (1), a pressure groove (4) is provided on the upper end of the base (1), a moving group (5) is provided on the side of the bracket (2) and inside the base (1), a limit plate (6) is connected to the side rail of the bracket (2), an adhesive applicator (7) is installed inside the limit plate (6), a pressure plate (301) is provided at the bottom of the bracket (3), and a control box is installed on one side of the base (1); The moving assembly (5) includes a motor (501) and a screw (502), with one end of the screw (502) mounted on the output end of the motor (501).
2. The paper box gluing and folding device according to claim 1, characterized in that: One of the movable groups (5) is installed on the outside of the bracket (2), and the screw (502) passes through the rear end protrusion of the limiting plate (6). The screw (502) and the limiting plate (6) are connected by threads.
3. The paper box gluing and folding device according to claim 1, characterized in that: Another motor (501) is mounted on the upper end of the limiting plate (6), and a movable seat (701) is nested on the outer surface of the glue applicator (7). The screw (502) penetrates the movable seat (701) and is embedded in the inner wall of the limiting plate (6). The screw (502) and the limiting plate (6) are movably connected, and the screw (502) and the movable seat (701) are threadedly connected.
4. The paper box gluing and folding device according to claim 1, characterized in that: A motor (501) of one of the moving groups (5) is installed on the side of the base (1). A limiting groove (101) is opened on the side of the base (1). The screw (502) can penetrate the base (1) and be embedded in the inner wall of the limiting groove (101). A slider (201) is fixedly installed on the inner side of the bracket (2). The slider (201) can be embedded in the limiting groove (101), and the slider (201) and the limiting groove (101) are slidably connected. The screw (502) can penetrate both ends of the slider (201), and the screw (502) and the slider (201) are threadedly connected.
5. The paper box gluing and folding device according to claim 1, characterized in that: The top of the glue applicator (7) is embedded with a connecting pipe (702), and the other end of the connecting pipe (702) is connected to a storage tank (703). A metering pump is provided between the connecting pipe (702) and the storage tank (703).
6. The paper box gluing and folding device according to claim 1, characterized in that: Several positioning groups (8) are installed on the upper end of the base (1). The positioning group (8) includes a positioning plate (801), an electric telescopic rod (802), and a clamping plate (803). The bottom of the positioning plate (801) is fixedly installed on the upper surface of the base (1). One end of the electric telescopic rod (802) is installed on the inner side of the positioning plate (801). The output end of the electric telescopic rod (802) is fixedly installed on one side of the clamping plate (803). The clamping plate (803) and the electric telescopic rod (802) are detachably connected. Two of the positioning groups (8) are installed at the upper edge of the base (1), and three of the positioning groups (8) are installed on the outer side of the pressure groove (4). The inner side of the clamping plate (803) is made of rubber.
7. The paper box gluing and folding device according to claim 1, characterized in that: Electric push rods (401) are embedded in the inner wall of each pressure groove (4). A push plate (402) is fixedly installed at the output end of the electric push rod (401). The push plate (402) is located inside the pressure groove (4), and the push plate (402) and the pressure groove (4) are movably connected.
8. A paper box gluing and folding device according to claim 7, characterized in that: The upper end of the push plate (402) is slidably and detachably connected to a contact plate (403). The upper end of the push plate (402) is provided with a dovetail groove (404). The bottom of the contact plate (403) is fixedly installed with a dovetail block (405). The dovetail block (405) can be embedded in the dovetail groove (404), and the dovetail block (405) and the dovetail groove (404) are slidably connected.
9. A paper box gluing and folding device according to claim 1, characterized in that: A hydraulic rod (302) is fixedly installed on the upper end of the pressure plate (301). The top of the hydraulic rod (302) is fixedly installed on the inner side of the bracket (3). The pressure plate (301) is located directly above the pressure groove (4). The pressure plate (301) has a trapezoidal cross section, and the bottom of the pressure plate (301) is made of rubber.
10. A paper box gluing and folding device according to claim 1, characterized in that: A top plate (406) is movably embedded in the bottom of the pressure groove (4), and a hydraulic rod (407) is fixedly installed at the bottom of the top plate (406). The hydraulic rod (407) is embedded in the bottom of the pressure groove (4).