Automatic pearl wool feeding device
By introducing an elastic guide component into the automated EPE foam feeding device, the problem of uneven EPE foam deviation was solved, achieving stable conveying and continuous processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YICHANG SHENGXIN PACKAGING MATERIALS CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-04-17
AI Technical Summary
In traditional automated EPE foam feeding devices, the uneven thickness of the EPE foam caused by the fixed guide roller structure makes it easy for the foam to deviate during the feeding process, resulting in problems such as dimensional deviations, stacking, and entanglement, which affect the continuity and efficiency of production.
The system employs an elastic guiding assembly, including a guide roller, a support frame, a sliding block, and a return spring. The position of the guide roller is adjusted by the sliding block under the action of the return spring, adapting to the uneven thickness of the pearl cotton and ensuring smooth conveying.
This effectively prevents pearl cotton from deviating during the feeding process, improves equipment usability, and ensures processing accuracy and production continuity.
Smart Images
Figure CN224132367U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of work technology, and in particular to an automated feeding device for pearl cotton. Background Technology
[0002] In the EPE foam processing industry, the performance of automated feeding devices directly affects production efficiency and product quality.
[0003] The automated EPE foam feeding device typically consists of a feeding mechanism comprised of a feeding rack, a tension adjusting device, and guide rollers. The feeding rack holds the EPE foam rolls, the tension adjusting device ensures the EPE foam maintains appropriate tension during feeding to prevent loosening or overstretching, and the guide rollers guide the EPE foam accurately into the conveying mechanism, which generally uses a belt conveyor or roller conveyor. It comprises a motor, a reducer, and a conveyor belt or rollers. The motor drives the conveyor belt or rollers to rotate via the reducer, thus conveying the EPE foam forward. The conveying speed can be adjusted using a frequency converter or similar device to adapt to different production needs. The positioning mechanism often employs photoelectric sensors, laser sensors, or mechanical positioning devices. Photoelectric or laser sensors can detect the edges or specific marks on the EPE foam to determine its position. Mechanical positioning devices use mechanical components such as stops and push rods to accurately position the EPE foam.
[0004] Traditional automated EPE foam feeding devices mostly use a fixed-height guide roller structure at the feeding end of the conveying mechanism. Due to differences in EPE foam production processes and raw materials, it is difficult to achieve a completely uniform thickness in actual production. When EPE foam of uneven thickness enters this type of conveying mechanism with fixed guide rollers, the thicker parts will experience greater compression resistance, while the thinner parts may deviate due to a lack of effective support. This causes the EPE foam to deviate during the feeding process. Once the EPE foam deviates, it will not only cause deviations in subsequent processing dimensions, such as inaccurate cutting length and irregular molding shape, but may also lead to problems such as EPE foam stacking and tangling on the guide rollers or conveyor belt, causing equipment shutdown for cleaning and seriously affecting production continuity and processing efficiency. Utility Model Content
[0005] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide an automated feeding device for EPE foam. This device can solve the problem that, due to the differences in EPE foam production processes and raw materials, the thickness of EPE foam is difficult to achieve in actual production. When EPE foam of uneven thickness enters the conveying mechanism with fixed guide rollers, the thicker parts will be subject to greater compression resistance, while the thinner parts may deviate due to a lack of effective support. This causes the EPE foam to deviate during the feeding process. Once the EPE foam deviates, it will not only cause deviations in subsequent processing dimensions, such as inaccurate cutting length and irregular forming shape, but may also cause problems such as stacking and entanglement of EPE foam on the guide rollers or conveyor belts, resulting in equipment shutdown for cleaning and seriously affecting production continuity and processing efficiency.
[0006] To achieve the above objectives, this utility model provides the following technical solution: an automated feeding device for pearl cotton, comprising a base and a tension roller, wherein elastic guide components are provided on both sides of the base;
[0007] The elastic guide assembly includes a guide roller, two support frames and two sliding blocks. The two support frames are fixedly connected to the corresponding support plates on the upper end of the base, and the outer walls of the two sliding blocks are slidably connected to the slots opened on the corresponding support frames.
[0008] The guide rollers are rotatably connected to the lower ends of the corresponding sliding blocks via rotating shafts at both ends. Fixed rods are fixedly connected inside the two support frames, and reset springs are sleeved on the outer walls of the two fixed rods.
[0009] Preferably, both sliding blocks are L-shaped, and the ends of the two fixed rods away from the base extend to the outside of the support frame. The two sliding blocks are slidably connected to the outer walls of the corresponding fixed rods.
[0010] The outer walls of the conical blocks on both sides of the two sliding blocks are slidably connected to the two conical grooves inside the corresponding support frame, and the two ends of the two return springs are fixedly connected to the upper outer wall of the corresponding sliding block and the inner wall of the groove on the support frame, respectively.
[0011] Preferably, a first motor is mounted on a fixing plate on the left support plate at the rear end of the base, and feeding rollers are rotatably connected to the opposite surfaces of the support plates on both sides at the rear end of the base.
[0012] The output end of the first motor extends to the outside of the left support plate of the base and is fixedly connected to one end of the feeding roller. The grooves on the opposite sides of the support plates on both sides of the base are rotatably connected to threaded rods.
[0013] Preferably, the slide blocks rotatably connected to both ends of the tension roller are respectively threaded to the outer wall of the corresponding threaded rod, and rotating blocks are rotatably connected to the upper surface of the support plates on both sides of the base;
[0014] Among them, the ends of the two threaded rods near the rotating block are both rotated and extended to the outside of the groove on the opposite side of the support plate on the base, and are respectively fixedly connected to one end of the corresponding rotating block. The opposite sides of the support plates on both sides of the front end of the base are equipped with transport components.
[0015] Preferably, a fixing frame is fixedly connected to the opposite face of the support plates on both sides of the rear end of the base, and a bidirectional threaded rod is rotatably connected inside the fixing frame. A second motor is installed on the outer wall of the fixing plate on the left support plate of the base.
[0016] The output end of the second motor extends rotatably into the interior of the fixed frame and is fixedly connected to one end of the bidirectional threaded rod.
[0017] Preferably, the outer wall of the bidirectional threaded rod is threaded with two moving blocks, and a hydraulic telescopic rod is installed inside the groove at the lower end of each of the two moving blocks;
[0018] The output ends of the two hydraulic telescopic rods are fixedly connected to guide blocks. The outer walls of the opposite sides of the two guide blocks are provided with guide limiting grooves. The outer walls of the conical blocks on both sides of the two moving blocks are slidably connected to the inner walls of the conical grooves on both sides of the fixed frame.
[0019] Compared with the prior art, the beneficial effects of this utility model are:
[0020] 1. This automated EPE foam feeding device, through the elastic guide assembly, when the EPE foam passes between the rollers and guide rollers in the transport assembly, if the EPE foam thickness is uneven or there is a certain tension, it will exert pressure on the guide rollers, causing the sliding block to overcome the elastic force of the return spring and slide upward along the groove on the fixed rod and support frame. At this time, the return spring is compressed. After the EPE foam passes, under the action of the return spring restoring its deformation, the sliding block drives the guide roller to reset and continue to guide the subsequent EPE foam. This elastic adjustment can effectively buffer the pressure of the EPE foam, ensure the smoothness of the EPE foam conveying, and thus avoid the phenomenon of EPE foam running off-center during the feeding process when EPE foam of uneven thickness enters the conveying mechanism, thereby effectively improving the practicality of the equipment. Attached Figure Description
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0023] Figure 2 This is a schematic diagram of the external structure of the guide roller of this utility model;
[0024] Figure 3 This is a schematic diagram of the external structure of the fixed frame of this utility model;
[0025] Figure 4 This utility model Figure 3 A structural schematic diagram of the enlarged view at point A in the middle.
[0026] Reference numerals: 1. Base; 2. Bidirectional threaded rod; 3. First motor; 4. Feeding roller; 5. Rotating block; 6. Fixed rod; 7. Guide roller; 8. Transport assembly; 9. Return spring; 10. Fixed frame; 11. Support frame; 12. Second motor; 13. Tensioning roller; 14. Threaded rod; 15. Sliding block; 16. Moving block; 17. Guide block; 18. Hydraulic telescopic rod. Detailed Implementation
[0027] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0028] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0029] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.
[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0031] Please see Figure 1-4 This utility model provides a technical solution: an automated feeding device for pearl cotton, including a base 1 and a tension roller 13;
[0032] Both sides of the base 1 are equipped with elastic guide components;
[0033] The elastic guide assembly includes a guide roller 7, two support frames 11, and two sliding blocks 15. Both sliding blocks 15 are L-shaped. The two support frames 11 are fixedly connected to the corresponding support plates on the upper end of the base 1. The outer walls of the two sliding blocks 15 are slidably connected to the slots on the corresponding support frames 11. The two ends of the guide roller 7 are rotatably connected to the lower ends of the corresponding sliding blocks 15 through rotating shafts. Fixed rods 6 are fixedly connected inside the two support frames 11. The ends of the two fixed rods 6 away from the base 1 are fixedly extended to the outside of the support frames 11. The two sliding blocks 15 are slidably connected to the outer walls of the corresponding fixed rods 6. Return springs 9 are sleeved on the outer walls of the two fixed rods 6. The outer walls of the tapered blocks on both sides of the two sliding blocks 15 are slidably connected to the two tapered slots on the slots of the corresponding support frames 11. The two ends of the two return springs 9 are fixedly connected to the upper outer wall of the corresponding sliding block 15 and the inner wall of the slot on the support frame 11, respectively.
[0034] The base 1 has a first motor 3 mounted on a fixed plate on the left support plate at the rear end. Feeding rollers 4 are rotatably connected to the opposite faces of the support plates at the rear end of the base 1. The output end of the first motor 3 extends rotatably to the outside of the left support plate of the base 1 and is fixedly connected to one end of the feeding roller 4. Threaded rods 14 are rotatably connected to slots on one side of the opposite faces of the support plates on both sides of the base 1. Slides rotatably connected to both ends of the tension roller 13 are threadedly connected to the outer walls of the corresponding threaded rods 14. Rotating blocks 5 are rotatably connected to the upper surfaces of the support plates on both sides of the base 1. The ends of the two threaded rods 14 near the rotating blocks 5 extend rotatably to the outside of the slots on the opposite faces of the support plates on the upper side of the base 1 and are fixedly connected to the ends of the corresponding rotating blocks 5. The base 1 also has a... The transport component 8 has a fixed frame 10 fixedly connected to the opposite sides of the support plates on both sides of the rear end of the base 1. A bidirectional threaded rod 2 is rotatably connected inside the fixed frame 10. A second motor 12 is installed on the outer wall of the fixed plate on the left support plate of the base 1. The output end of the second motor 12 extends rotatably into the interior of the fixed frame 10 and is fixedly connected to one end of the bidirectional threaded rod 2. Two moving blocks 16 are threadedly connected to the outer wall of the bidirectional threaded rod 2. A hydraulic telescopic rod 18 is installed in the groove at the lower end of each of the two moving blocks 16. A guide block 17 is fixedly connected to the output end of each of the two hydraulic telescopic rods 18. A guide limiting groove is opened on the outer wall of the opposite side of each of the two guide blocks 17. The outer walls of the conical blocks on both sides of the two moving blocks 16 are slidably connected to the conical grooves on both sides of the inner wall of the fixed frame 10.
[0035] Furthermore, when using this device, it is started by connecting to an external power source. Before starting the automated EPE foam feeding device, the rotating block 5 is rotated to drive the threaded rod 14 to rotate according to the specifications of the EPE foam and subsequent processing requirements, so that the tensioning roller 13 moves to a suitable position and the initial tension of the EPE foam is adjusted. At the same time, the second motor 12 is started to drive the bidirectional threaded rod 2 to rotate, so that the two moving blocks 16 move axially to a suitable position within the fixed frame 10. Then, the height of the guide block 17 is adjusted by the hydraulic telescopic rod 18 to place the guide limit groove in a suitable position, completing the initial debugging of the device. After the device is started, the first motor 3 starts working, driving the unloading roller 4 to rotate, and the EPE foam roll begins to be released. The EPE foam first passes over the tensioning roller 13 and then passes through the guide limit grooves on the two guide blocks 17. When passing through the elastic guide assembly, if the EPE foam is uneven in thickness or has a certain tension, it will exert pressure on the guide roller 7 as it passes between the roller and guide roller 7 in the transport assembly 8. This causes the sliding block 15 to overcome the elastic force of the return spring 9 and slide upward along the groove on the fixed rod 6 and the support frame 11. At this time, the return spring 9 is compressed. After the EPE foam passes through, the sliding block 15 drives the guide roller 7 to reset under the action of the return spring 9 restoring its deformation, and continues to guide the subsequent EPE foam. This elastic adjustment can effectively buffer the pressure of the EPE foam and ensure the smoothness of the EPE foam transport. At the same time, during the transport process, the tension roller 13 automatically adjusts its position according to the tension of the EPE foam under the adjustment of the threaded rod 14, keeping the EPE foam in a suitable tension state at all times, preventing the EPE foam from slack and accumulating or breaking due to excessive tension.
[0036] When the pearl cotton passes between the rollers and guide rollers 7 in the conveying assembly 8 through the elastic guide assembly, if the pearl cotton thickness is uneven or there is a certain tension, it will exert pressure on the guide rollers 7. This causes the sliding block 15 to overcome the elastic force of the return spring 9 and slide upward along the groove on the fixed rod 6 and the support frame 11. At this time, the return spring 9 is compressed. After the pearl cotton passes through, under the action of the return spring 9 restoring its deformation, the sliding block 15 drives the guide rollers 7 to reset and continue to guide the subsequent pearl cotton. This elastic adjustment can effectively buffer the pressure of the pearl cotton, ensure the smoothness of the pearl cotton conveying, and thus avoid the phenomenon of pearl cotton running off-center during the feeding process when pearl cotton with uneven thickness enters the conveying mechanism, thereby effectively improving the practicality of the equipment.
[0037] Structural Description: Base 1: As the basic support structure of the entire feeding device, it provides an installation platform for other components. The upper end is equipped with elastic guide components, feeding rollers 4, conveying components 8, etc. The rear end and sides are equipped with transmission components such as motors and threaded rods to ensure the stability and integrity of each component during operation.
[0038] The bidirectional threaded rod 2 is rotatably connected inside the fixed frame 10 and driven by the second motor 12. Its outer wall is threadedly connected to two moving blocks 16. By rotating, the two moving blocks 16 can move in opposite directions along the axial direction, thereby driving the hydraulic telescopic rod 18 and guide block 17 connected to it to adjust their positions.
[0039] First motor 3: mounted on a fixed plate on the left support plate at the rear end of the base 1, with its output end extending to the outside of the left support plate of the base 1 and fixedly connected to one end of the feeding roller 4, providing rotational power to the feeding roller 4 and controlling the feeding speed and amount of pearl cotton;
[0040] Feeding roller 4: Rotatably connected to the opposite sides of the support plates at the rear end of the base 1, it rotates under the drive of the first motor 3, and is used to place and release the pearl cotton roll, so that the pearl cotton can smoothly enter the subsequent process of the feeding device.
[0041] Rotating block 5: Rotatably connected to the upper surface of the support plates on both sides of the base 1, and fixedly connected to the threaded rod 14. By manually or otherwise rotating the rotating block 5, the threaded rod 14 can be rotated, thereby adjusting the position of the tension roller 13.
[0042] Fixed rod 6: It is fixedly connected inside the support frame 11, with one end extending to the outside of the support frame 11. It provides sliding guidance for the sliding block 15 and is also the support structure for the return spring 9, so that the sliding block 15 can slide stably on its outer wall.
[0043] Guide roller 7: Both ends are rotatably connected to the lower end of the corresponding sliding block 15 via rotating shafts, and are used to guide the pearl cotton. Driven by the sliding block 15, the guide roller 7 can move up and down to adapt to pearl cotton of different thicknesses and conditions, and ensure that the pearl cotton maintains the correct path during the conveying process.
[0044] Transport component 8: Installed on the opposite side of the support plates on both sides of the front end of the base 1, it is a key component for conveying pearl cotton. It is responsible for transporting pearl cotton from the feed roller 4 to the subsequent processing equipment. Its specific structure may include a conveyor belt, drive motor, etc. The continuous conveying of pearl cotton is achieved by the rotation of the transmission belt.
[0045] Return spring 9: It is sleeved on the outer wall of the fixed rod 6, and its two ends are fixedly connected to the upper outer wall of the sliding block 15 and the inner wall of the groove on the support frame 11, respectively. When the pearl cotton exerts pressure on the guide roller 7 and causes the sliding block 15 to slide upward, the return spring 9 is compressed. After the pressure is removed, the return spring 9 returns to its deformation and pushes the sliding block 15 and the guide roller 7 to reset, thus playing the role of buffering and resetting.
[0046] Fixed frame 10: It is fixedly connected to the opposite surfaces of the support plates on both sides of the rear end of the base 1, and is internally rotatably connected to the bidirectional threaded rod 2. The inner wall has tapered grooves on both sides for cooperating with the tapered blocks on both sides of the moving block 16 to guide and limit the moving block 16, so as to ensure that the moving block 16 moves stably under the drive of the bidirectional threaded rod 2.
[0047] Support frame 11: It is fixedly connected to the support plate at the upper end of the base 1, and is equipped with a fixing rod 6 and a return spring 9 inside. It has a slot for sliding and installing the sliding block 15. Its structure provides support for the elastic guide assembly, and at the same time cooperates with the sliding block 15 to realize the elastic movement of the guide roller 7.
[0048] The second motor 12 is mounted on the outer wall of the fixed plate on the left support plate of the base 1. Its output end extends to the inside of the fixed frame 10 and is fixedly connected to one end of the bidirectional threaded rod 2, providing rotational power to the bidirectional threaded rod 2, driving the moving block 16 to move, and realizing the automatic adjustment of the position of the guide block 17.
[0049] Tensioning roller 13: The slide blocks at both ends are rotatably connected to the outer wall of the corresponding threaded rod 14. The threaded rod 14 can move in the vertical direction by rotating, which is used to adjust the tension of the pearl cotton and ensure that the pearl cotton maintains a suitable tension during the conveying process, so as to avoid loosening or breakage.
[0050] Threaded rod 14: Rotatably connected to the groove on one side of the opposite side of the support plates on both sides of the base 1, one end of which is fixedly connected to the rotating block 5. Rotating the threaded rod 14 can drive the tension roller 13 to move up and down. Its threaded structure ensures the accuracy and stability of the movement of the tension roller 13.
[0051] Sliding block 15: It is L-shaped, with its outer wall slidably connected to the groove on the support frame 11, and its lower end rotatably connected to the shaft of the guide roller 7. The two conical blocks on both sides are slidably connected to the conical grooves inside the groove on the support frame 11. Under the action of the return spring 9 and the pressure of the pearl cotton, the sliding block 15 can slide up and down in the support frame 11, driving the guide roller 7 to move and realize the elastic guidance of the pearl cotton.
[0052] Moving block 16: threaded connection to the outer wall of the bidirectional threaded rod 2, with a hydraulic telescopic rod 18 installed inside the groove at the lower end. The two conical blocks on both sides are slidably connected to the conical grooves on both sides of the inner wall of the fixed frame 10. Driven by the bidirectional threaded rod 2, the moving block 16 can move axially. In conjunction with the hydraulic telescopic rod 18 and the guide block 17, it realizes the guiding and limiting functions of the pearl cotton.
[0053] Guide block 17: It is connected to the moving block 16 via a hydraulic telescopic rod 18. A guide and limiting groove is provided on the outer wall of the opposite side to guide and limit the pearl cotton, ensuring that the pearl cotton maintains the correct position and direction during the conveying process and preventing deviation.
[0054] Hydraulic telescopic rod 18: Installed inside the groove at the lower end of the movable block 16, with its output end fixedly connected to the guide block 17. Its extension and retraction are controlled by the hydraulic system, which can adjust the height of the guide block 17 to accommodate pearl cotton of different specifications and conveying requirements, thereby enhancing the applicability of the device.
[0055] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. An automatic pearl wool feeding device, comprising a base (1) and a tension roller (13), characterized in that: Both sides of the base (1) are provided with elastic guide components; The elastic guide assembly includes a guide roller (7), two support frames (11) and two sliding blocks (15). The two support frames (11) are fixedly connected to the support plate at the upper end of the base (1). The outer walls of the two sliding blocks (15) are slidably connected to the grooves opened on the corresponding support frames (11). Among them, the two ends of the guide roller (7) are rotatably connected to the lower end of the corresponding sliding block (15) through the rotating shaft. The two support frames (11) are fixedly connected to the inside of the fixed rod (6), and the outer walls of the two fixed rods (6) are fitted with reset springs (9).
2. The automatic pearl wool feeding device according to claim 1, characterized in that: Both sliding blocks (15) are L-shaped, and the ends of the two fixed rods (6) away from the base (1) are fixedly extended to the outside of the support frame (11). The two sliding blocks (15) are slidably connected to the outer wall of the corresponding fixed rod (6); Among them, the outer walls of the conical blocks on both sides of the two sliding blocks (15) are slidably connected to the two conical grooves inside the grooves of the corresponding support frame (11), and the two ends of the two reset springs (9) are fixedly connected to the upper outer wall of the corresponding sliding block (15) and the inner wall of the groove on the support frame (11).
3. The automatic pearl wool feeding device according to claim 1, characterized in that: The first motor (3) is installed on the fixed plate on the left support plate at the rear end of the base (1), and the feeding roller (4) is rotatably connected to the opposite face of the support plates on both sides at the rear end of the base (1). The output end of the first motor (3) extends to the outside of the left support plate of the base (1) and is fixedly connected to one end of the feeding roller (4). The grooves on the opposite side of the support plates on both sides of the base (1) are rotatably connected to threaded rods (14).
4. The automatic pearl wool feeding device according to claim 3, characterized in that: The sliding blocks rotatably connected to both ends of the tension roller (13) are respectively threaded to the outer wall of the corresponding threaded rod (14), and rotating blocks (5) are rotatably connected to the upper surface of the support plates on both sides of the base (1); Among them, the two threaded rods (14) near the rotating block (5) extend to the outside of the groove on the opposite side of the support plate on the base (1) and are fixedly connected to one end of the corresponding rotating block (5). The transport components (8) are installed on the opposite side of the support plates on both sides of the front end of the base (1).
5. The automatic pearl wool feeding device according to claim 1, characterized in that: The base (1) has a fixed frame (10) fixedly connected to the opposite side of the support plates on both sides of the rear end. The fixed frame (10) is rotatably connected to a two-way threaded rod (2). A second motor (12) is installed on the outer wall of the fixed plate on the left support plate of the base (1). The output end of the second motor (12) extends rotatably into the interior of the fixed frame (10) and is fixedly connected to one end of the bidirectional threaded rod (2).
6. The automatic pearl wool feeding device according to claim 5, characterized in that: The outer wall of the bidirectional threaded rod (2) is threaded with two moving blocks (16), and a hydraulic telescopic rod (18) is installed inside the groove at the lower end of each of the two moving blocks (16). Among them, the output ends of the two hydraulic telescopic rods (18) are fixedly connected to guide blocks (17), and the outer walls of the opposite sides of the two guide blocks (17) are provided with guide limiting grooves. The outer walls of the conical blocks on both sides of the two moving blocks (16) are slidably connected to the inner walls of the conical grooves on both sides of the inner wall of the fixed frame (10).