Adhesive tape rewinding equipment with slitting function

Abstract

The invention relates to the technical field of adhesive tape processing, and discloses adhesive tape rewinding equipment with a slitting function, the adhesive tape rewinding equipment comprises a rewinding machine main body, a guide roller, a tension adjusting roller, a slitting knife rest, a transition roller and a rewinding roller are arranged on the inner side of the rewinding machine main body, placing grooves are formed in the inner walls of the two sides of the rewinding machine main body, and the upper ends of the placing grooves are S-shaped; the ends of the inner walls of the two sides of the rewinding machine body are rotationally connected with chain wheels, the end of one side of the rewinding machine body is fixedly connected with a motor, the output end of the motor is fixedly connected with a transmission shaft, and the two chain wheels are fixedly connected with the transmission shaft. According to the adhesive tape rewinding equipment with the slitting function, when the rewinding machine body penetrates through materials, only one end of an adhesive tape mother roll needs to be fixed to the traction rod in an adhering or winding mode, the traction rod drives an adhesive tape to move, the adhesive tape penetrates through the guide roller, the tension adjusting roller, the slitting tool rest and the transition roller, and the rewinding machine body is easier and more convenient to penetrate through the materials.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive tape processing, in particular to an adhesive tape rewinding device with a slitting function. Background Art

[0002] The rewinder is a kind of rewinding and slitting equipment specially used for materials such as paper, mica tape, film and tape. It can accurately slit wide rolls into the required width, realizing the conversion from large rolls to small rolls, which is not only convenient for subsequent processing, but also optimizes storage and use. For tapes, the rewinder can rewind large rolls of tape into smaller rolls, or repair defective products, thereby improving the use efficiency and storage convenience of the tape.

[0003] For example, the patent with the patent authorization announcement number CN218319767U discloses a tape rewinding device with a slitting function, including a rewinding machine body, an auxiliary wheel and a driving assembly, wherein a rewinding drum is arranged inside the rewinding machine body, and an inflatable shaft is arranged inside the rewinding drum, wherein the auxiliary wheel is arranged on the right outer wall of the inflatable shaft, and the driving assembly for driving the auxiliary wheel to move is arranged inside the rewinding machine body, wherein the driving assembly includes a driving motor, a threaded rod, a first movable sleeve, a second movable sleeve and a connecting plate, and a threaded rod is installed at the output end of the driving motor. After the rewinding drum has finished rewinding the tape, the tape rewinding device with a slitting function can conveniently take out the rewinding drum without too many cumbersome operation procedures, thereby reducing the work process of the staff and increasing the practicality of the equipment. Through the setting of the slitting assembly, the tape can be quickly slit, while ensuring the safety during slitting, so that the staff can quickly take out the tape, thereby increasing the convenience of the equipment.

[0004] The above-mentioned tape rewinding equipment with slitting function still has certain defects: The current tape slitting and rewinding machine's material threading operation process is rather cumbersome. The operator needs to first fix the large roll of parent roll on the unwinding shaft, and then lead the tape from the parent roll, passing through a complex path consisting of guide rollers, tension adjustment rollers, slitting knife holders and transition rollers in sequence. The entire process involves more than ten operation nodes, and each link requires repeated adjustment of the position of equipment components, which is time-consuming, labor-intensive and extremely inconvenient. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a tape rewinding device with a slitting function, which makes the rewinding machine body simpler and more convenient when threading materials.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a tape rewinding device with a slitting function, comprising a rewinding machine main body, wherein a guide roller, a tension adjustment roller, a slitting knife frame, a transition roller and a rewinding roller are arranged on the inner side of the rewinding machine main body, and placement grooves are opened on the inner walls on both sides of the rewinding machine main body, and the upper ends of the placement grooves are S-shaped, and chains matching therewith are arranged in the placement grooves, and sprocket wheels are rotatably connected to the ends of the inner walls on both sides of the rewinding machine main body, and a motor is fixedly connected to the end of one side of the rewinding machine main body, and a transmission shaft is fixedly connected to the output end of the motor, and the two sprocket wheels are fixedly connected to the transmission shaft, and the opposite surfaces of the two chains are fixedly connected to connecting blocks, and a traction rod is arranged between the two connecting blocks, and sleeves matching the connecting blocks are slidably connected to the two ends of the traction rod, and lifting blocks are slidably connected to the two sides of the rewinding machine main body, and the tension adjustment roller and the slitting knife frame are installed on the lifting blocks, and a lifting assembly is arranged at the bottom of the lifting block.

[0007] Furthermore, both ends of the traction rod are fixedly connected with anti-slip blocks, the middle position of the anti-slip block is fixedly connected with a sliding rod, the end of the sliding rod away from the traction rod is slidably connected with a sliding block, the sliding block is fixedly connected to the inner wall of the sleeve, and the end of the sliding rod close to the traction rod is sleeved with an outward push elastic member, one end of the outward push elastic member is fixedly connected to the anti-slip block, and the other end of the outward push elastic member is fixedly connected to the sliding block.

[0008] Furthermore, limiting blocks are fixedly connected to both sides of the lifting block, limiting grooves matching the limiting blocks are opened on both sides of the rewinding machine body, the middle position of the limiting block is slidably connected with a limiting rod, the upper and lower ends of the limiting rod are respectively fixed to the top and bottom of the limiting groove, the upper end of the limiting rod is sleeved with a downward pressing elastic part, the upper end of the downward pressing elastic part is fixed to the limiting groove, and the lower end of the downward pressing elastic part is fixed to the limiting block.

[0009] Furthermore, the lifting assembly includes a gear, an insert block and a tooth block. A left side plate is fixedly connected to the left side of the rewinder body, and a right side plate is fixedly connected to the right side of the rewinder body. Gears are provided on one side of the left plate and the right side plate close to the middle position of the rewinder body. The gear is fixedly connected to the side of the end of the transmission shaft away from the sprocket. Slots are provided on both sides of the rewinder body, and an insert block is slidably connected inside the slot. The insert block is located at the top of the gear, and a slide groove is provided on one side of the insert block close to the middle position of the rewinder body. A guide rail is slidably connected inside the slide groove, and the guide rail is fixedly connected to the rewinder body. A tooth block is fixedly connected to the bottom of the insert block, and the tooth block meshes with the gear.

[0010] Furthermore, a reset elastic member is provided at one end of the guide rail away from the lifting block, one end of the reset elastic member is fixedly connected to the end of the slide slot, and a pushing elastic member is fixedly connected to the outer wall of one end of the insert block away from the lifting block.

[0011] Furthermore, an anti-slip rod is slidably connected to the middle position of the guide rail, two ends of the anti-slip rod are respectively fixed to two ends of the slide groove, and the reset elastic member is sleeved on one end of the anti-slip rod away from the lifting block.

[0012] Furthermore, the end of the guide rail is trapezoidal, the end of the insert block close to the lifting block is conical, and the lower end of the lifting block is arc-shaped.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. For this type of tape rewinding equipment with slitting function, when the rewinding machine body is threading the material, it is only necessary to place the traction rod between the two connecting blocks, and connect the traction rod and the connecting block with a sleeve, and then glue one end of the tape mother roll to the traction rod, and then start the motor, the motor drives the sprocket to rotate through the transmission shaft, and the sprocket will push the chain and the connecting block on the chain to move, and the connecting block will drive the traction rod and the tape on the traction rod to move, so that the tape passes through the guide roller, tension adjustment roller, slitting knife holder and transition roller, making it easier and more convenient for the rewinding machine body to thread the material.

[0014] 2. For this type of tape rewinding equipment with slitting function, when the sprocket rotates to drive the chain to move, the gear will also rotate synchronously, thereby pushing the insert block to insert into the bottom of the lifting block, so that the height of the lifting block is increased, and then the tension adjustment roller and slitting knife holder installed on the lifting block are moved up, so that the space at the bottom of the slitting knife holder is larger, making the threading process simpler and more convenient.

[0015] 3. For this type of tape rewinding equipment with slitting function, after the material is threaded, the motor is started to reverse, and the motor will drive the gear to rotate in the opposite direction. The reset elastic part pushes the plug block and the tooth block on the plug block to move away from the lifting block until the tooth block on the plug block meshes with the gear again. Then the gear will push the tooth block to move, and the plug block is driven back to its original position through the gear, so that the lifting block can drive the tension adjustment roller and the slitting knife holder back to their original positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the local enlarged structure at point A in the middle; Figure 3 It is a schematic diagram of the structure of the present invention when it is fully unfolded; Figure 4 For the present invention Figure 3 A schematic diagram of the local enlarged structure at B in the middle; Figure 5 It is a partial structural schematic diagram of the rewinding machine body of the present invention; Figure 6 It is a structural schematic diagram of the traction rod of the present invention; Figure 7 It is a schematic diagram of the connection structure of the sprocket, gear and plug block of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the local enlarged structure at point C in the middle.

[0017] In the figure: 1. rewinding machine body; 2. guide roller; 3. tension adjustment roller; 4. slitting knife holder; 5. transition roller; 6. rewinding roller; 7. motor; 8. sprocket; 9. transmission shaft; 10. chain; 11. connecting block; 12. traction rod; 13. anti-slip block; 14. slide rod; 15. outward push elastic member; 16. slide block; 17. sleeve; 18. left side plate; 19. right side plate; 20. lifting block; 21. limit groove; 22. limit rod; 23. downward push elastic member; 24. limit block; 25. slot; 26. guide rail; 27. plug block; 28. gear; 29. ​​slide groove; 30. anti-slip rod; 31. reset elastic member; 32. tooth block; 33. push elastic member. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] See also Figures 1 to 8 , a tape rewinding device with slitting function, including a rewinding machine body 1, a guide roller 2, a tension adjustment roller 3, a slitting knife frame 4, a transition roller 5 and a rewinding roller 6 are arranged on the inner side of the rewinding machine body 1, and placement grooves are opened on the inner walls on both sides of the rewinding machine body 1, and the upper ends of the placement grooves are S-shaped, and chains 10 matching therewith are arranged in the placement grooves, and sprocket wheels 8 are rotatably connected to the ends of the inner walls on both sides of the rewinding machine body 1, and a motor 7 is fixedly connected to the end of one side of the rewinding machine body 1, and a transmission shaft 9 is fixedly connected to the output end of the motor 7, and two sprocket wheels 8 are fixedly connected to the transmission shaft 9, and connecting blocks 11 are fixedly connected to the opposite surfaces of the two chains 10, and a traction rod 12 is arranged between the two connecting blocks 11, and sleeves 17 matching the connecting blocks 11 are slidably connected to the two ends of the traction rod 12, and lifting blocks 20 are slidably connected to the two sides of the rewinding machine body 1, and the tension adjustment roller 3 and the slitting knife frame 4 are both installed on the lifting blocks 20, and a lifting component is arranged at the bottom of the lifting block 20.

[0020] The tape rewinding device with slitting function in the present invention only needs to place the traction rod 12 between the two connecting blocks 11 when the rewinding machine main body 1 is threading the material, and then push the sleeve 17 so that the sleeve 17 is sleeved on the connecting block 11, and the traction rod 12 and the connecting block 11 are connected together through the sleeve 17, and then one end of the tape mother roll is glued (or wound) and fixed on the traction rod 12, and then the motor 7 is started, and the motor 7 drives the sprocket 8 to rotate through the transmission shaft 9, and the sprocket 8 will push the chain 10 and the connecting block 11 on the chain 10 to move, and the connecting block 11 will drive the traction rod 12 and the tape on the traction rod 12 to move, so that one end of the tape mother roll first passes over the top of the guide roller 2, and then passes through the bottom of the tension adjustment roller 3, the slitting knife frame 4 and the transition roller 5, until the end of the tape mother roll is located on one side of the rewinding roller 6, and the whole threading process is simple. It is convenient and easy to operate. Then the traction rod 12 can be removed from the connecting block 11 to facilitate the staff to stick the end of the tape mother roll to the paper tube surface of the rewinding roller 6. After the traction rod 12 is removed from the connecting block 11, the motor 7 can be rotated in the opposite direction, and the sprocket 8 and the driving chain 10 can be moved to the original position, and then the connecting block 11 can be pulled back to the original position. After all the tape mother rolls are all stuck to the paper tube surface on the rewinding roller 6, the traction rod 12 can be taken to the original position, and after the connecting block 11 returns to the original position, the traction rod 12 can be installed on the connecting block 11 to facilitate the next threading work. In addition, the structure of the rewinding machine body 1 in the present invention is similar to the prior art, and the patent authorization announcement number is CN218319767U, which discloses a tape rewinding device with a slitting function, so it will not be elaborated here.

[0021] As a preferred technical solution of the present invention, both ends of the traction rod 12 are fixed with anti-slip blocks 13, the middle position of the anti-slip block 13 is fixed with a sliding rod 14, the end of the sliding rod 14 away from the traction rod 12 is slidably connected with a sliding block 16, the sliding block 16 is fixed to the inner wall of the sleeve 17, and the end of the sliding rod 14 close to the traction rod 12 is sleeved with an outward push elastic member 15, one end of the outward push elastic member 15 is fixed to the anti-slip block 13, and the other end of the outward push elastic member 15 is fixed to the sliding block 16.

[0022] Specifically, when installing the traction rod 12, you only need to pull the sleeve 17 in the direction of the traction rod 12 to expose the anti-slip block 13, then align the anti-slip block 13 with the connecting block 11, and then loosen the sleeve 17. Under the push of the outward elastic member 15, the slider 16 will move with the sleeve 17 in the direction of the connecting block 11, thereby connecting and fixing the traction rod 12 and the connecting block 11 together. The above structure is relatively simple and convenient to install and disassemble. In this way, after the traction rod 12 pulls one end of the tape mother roll to one side of the rewinding roller 6, the traction rod 12 can be removed from the connecting block 11, so that the operator can stick the slit tape to the paper tube of the rewinding roller 6.

[0023] As a preferred technical solution of the present invention, both sides of the lifting block 20 are fixedly connected to the limit blocks 24, and both sides of the rewinding machine body 1 are provided with limit grooves 21 matching the limit blocks 24. The middle position of the limit block 24 is slidably connected to the limit rod 22, and the upper and lower ends of the limit rod 22 are respectively fixedly connected to the top and bottom of the limit groove 21. The upper end of the limit rod 22 is sleeved with a downward pressing elastic member 23, the upper end of the downward pressing elastic member 23 is fixedly connected to the limit groove 21, and the lower end of the downward pressing elastic member 23 is fixedly connected to the limit block 24.

[0024] As a preferred technical solution of the present invention, the lifting assembly includes a gear 28, an insert block 27 and a tooth block 32. A left side plate 18 is fixedly connected to the left side of the rewinding machine body 1, and a right side plate 19 is fixedly connected to the right side of the rewinding machine body 1. A gear 28 is provided on the side of the left side plate 18 and the right side plate 19 close to the middle position of the rewinding machine body 1. The gear 28 is fixedly connected to the side of the end of the transmission shaft 9 away from the sprocket 8. Slots 25 are provided on both sides of the rewinding machine body 1. An insert block 27 is slidably connected inside the slot 25. The insert block 27 is located at the top of the gear 28. A slide groove 29 is provided on the side of the insert block 27 close to the middle position of the rewinding machine body 1. The guide rail 26 is fixedly connected to the rewinding machine body 1. A tooth block 32 is fixedly connected to the bottom of the insert block 27, and the tooth block 32 meshes with the gear 28.

[0025] Specifically, when the motor 7 is just started to carry out the threading process, the motor 7 drives the sprocket 8 to rotate through the transmission shaft 9, and at the same time drives the gear 28 to rotate through the transmission shaft 9. The gear 28 will push the tooth block 32 to move, and the tooth block 32 will drive the insert block 27 to move in the direction of the lifting block 20. The lifting block 20 is lifted by the insert block 27, so that the tension adjustment roller 3 and the slitting knife frame 4 installed on the lifting block 20 move upward (the avoidance action is completed before the connecting block 11 reaches the position of the tension adjustment roller 3), so as to avoid the tension adjustment roller 3 squeezing the tape or the slitting knife frame 4 cutting the tape during the threading process, and at the same time, it also makes the space on the threading path larger. Even if the tape is offset during the threading process, the staff has sufficient space to adjust the tape.

[0026] As a preferred technical solution of the present invention, a reset elastic member 31 is provided at one end of the guide rail 26 away from the lifting block 20, one end of the reset elastic member 31 is fixedly connected to the end of the slide groove 29, and a pushing elastic member 33 is fixedly connected to the outer wall of the end of the insert block 27 away from the lifting block 20.

[0027] Specifically, after the material is threaded (at this time, the connecting block 11 is between the rewinding roller 6 and the transition roller 5), the motor 7 is started to reverse, and the motor 7 will drive the gear 28 and the sprocket 8 to rotate in the opposite direction. The tooth block 32 will re-engage with the gear 28 under the push of the reset elastic member 31, and then the gear 28 will push the tooth block 32 to move, and the tooth block 32 will drive the plug block 27 to move away from the lifting block 20, until the tooth block 32 is disengaged from the gear 28 again, so that the plug block 27 returns to its original position (when the plug block 27 returns to its original position, the tooth block 32 will be disengaged from the gear 28 again, and when the push elastic member 31 is pushed, the tooth block 32 will re-engage with the gear 28. Under the action of the dynamic elastic member 33, the plug block 27 and the tooth block 32 have a tendency to move in the direction of the gear 28. Once the threading operation is needed again, when the motor 7 drives the gear 28 to rotate in the forward direction, the tooth block 32 will mesh with the gear 28 again under the push of the elastic member 33) to facilitate the next threading operation. In the process of the plug block 27 moving toward the original position, the lifting block 20 will gradually lose the restriction of the plug block 27. Under the push of the downward elastic member 23, the lifting block 20 will also drive the tension adjustment roller 3 and the slitting knife holder 4 to gradually move downward and then return to the original position.

[0028] In addition, it is worth mentioning that: when the plug block 27 is in the original position, the pushing elastic member 33 is in a compressed state, so the pushing elastic member 33 has a tendency to push the plug block 27 and the tooth block 32 to move in the direction of the lifting block 20. At the same time, since the reset elastic member 31 is not fixed to the guide rail 26, the reset elastic member 31 is in a normal state (that is, a state that is neither stretched nor compressed); when the plug block 27 is below the lifting block 20, the reset elastic member 31 is in a compressed state (at this time, since the pushing elastic member 33 is only connected to the plug block 27, the pushing elastic member 33 is not stretched), so the reset elastic member 31 has a tendency to push the plug block 27 and the tooth block 32 to move away from the lifting block 20.

[0029] As a preferred technical solution of the present invention, an anti-slip rod 30 is slidably connected to the middle position of the guide rail 26, and the two ends of the anti-slip rod 30 are respectively fixed to the two ends of the slide groove 29, and a reset elastic member 31 is sleeved on the end of the anti-slip rod 30 away from the lifting block 20.

[0030] Specifically, the anti-slip rod 30 is used to restrict the resetting elastic member 31 to prevent the resetting elastic member 31 from being detached from the slide groove 29 , which causes the resetting elastic member 31 to lose the function of pulling or pushing the insert block 27 to move.

[0031] As a preferred technical solution of the present invention, the end of the guide rail 26 is trapezoidal, the end of the insert block 27 close to the lifting block 20 is conical, and the lower end of the lifting block 20 is arc-shaped.

[0032] Specifically, the trapezoidal guide rail 26 has a better limiting and guiding effect, the conical plug block 27 can more easily lift the lifting block 20, and the arc shape of the lower end of the lifting block 20 can make it easier to insert the plug block 27 under the lifting block 20.

[0033] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A tape rewinding device with a slitting function, comprising a rewinding machine body (1), wherein a guide roller (2), a tension adjustment roller (3), a slitting blade holder (4), a transition roller (5) and a rewinding roller (6) are arranged inside the rewinding machine body (1), characterized in that: The inner walls of both sides of the rewinding machine body (1) are provided with placement grooves, the upper ends of the placement grooves are S-shaped, and chains (10) matching therewith are arranged in the placement grooves. The ends of the inner walls of both sides of the rewinding machine body (1) are rotatably connected to sprocket wheels (8), the end of one side of the rewinding machine body (1) is fixedly connected to a motor (7), the output end of the motor (7) is fixedly connected to a transmission shaft (9), the two sprocket wheels (8) are fixedly connected to the transmission shaft (9), the opposite surfaces of the two chains (10) are fixedly connected to connecting blocks (11), a traction rod (12) is provided between the two connecting blocks (11), and sleeves (17) matching the connecting blocks (11) are slidably connected at both ends of the traction rod (12), and lifting blocks (20) are slidably connected to both sides of the rewinding machine body (1), the tension adjustment roller (3) and the slitting knife frame (4) are both mounted on the lifting blocks (20), and a lifting assembly is provided at the bottom of the lifting block (20).

2. The tape rewinding device with slitting function according to claim 1, characterized in that: Both ends of the traction rod (12) are fixedly connected with anti-slip blocks (13), a sliding rod (14) is fixedly connected to the middle position of the anti-slip block (13), one end of the sliding rod (14) away from the traction rod (12) is slidably connected with a sliding block (16), the sliding block (16) is fixedly connected to the inner wall of a sleeve (17), and one end of the sliding rod (14) close to the traction rod (12) is sleeved with an outward push elastic member (15), one end of the outward push elastic member (15) is fixedly connected to the anti-slip block (13), and the other end of the outward push elastic member (15) is fixedly connected to the sliding block (16).

3. The tape rewinding device with slitting function according to claim 1, characterized in that: The lifting block (20) is fixedly connected to a limiting block (24) on both sides, and the rewinding machine body (1) is provided with a limiting groove (21) matching the limiting block (24) on both sides. The middle position of the limiting block (24) is slidably connected to a limiting rod (22), and the upper and lower ends of the limiting rod (22) are respectively fixedly connected to the top and bottom of the limiting groove (21), and the upper end of the limiting rod (22) is sleeved with a downward pressing elastic member (23), the upper end of the downward pressing elastic member (23) is fixedly connected to the limiting groove (21), and the lower end of the downward pressing elastic member (23) is fixedly connected to the limiting block (24).

4. The tape rewinding device with slitting function according to claim 1, characterized in that: The lifting assembly comprises a gear (28), an insert block (27) and a tooth block (32); a left side plate (18) is fixedly connected to the left side of the rewinding machine body (1); a right side plate (19) is fixedly connected to the right side of the rewinding machine body (1); a gear (28) is provided on one side of the left side plate (18) and the right side plate (19) close to the middle position of the rewinding machine body (1); the gear (28) is fixedly connected to the end of the transmission shaft (9) away from the sprocket (8); and a gear (28) is provided on both sides of the rewinding machine body (1). A slot (25), wherein an insert block (27) is slidably connected inside the slot (25), wherein the insert block (27) is located at the top of the gear (28), a slide groove (29) is provided on one side of the insert block (27) close to the middle position of the rewinding machine body (1), wherein a guide rail (26) is slidably connected inside the slide groove (29), wherein the guide rail (26) is fixedly connected to the rewinding machine body (1), and a tooth block (32) is fixedly connected to the bottom of the insert block (27), wherein the tooth block (32) meshes with the gear (28).

5. The tape rewinding device with slitting function according to claim 4, characterized in that: A reset elastic member (31) is provided at one end of the guide rail (26) away from the lifting block (20), one end of the reset elastic member (31) is fixedly connected to the end of the slide groove (29), and a pushing elastic member (33) is fixedly connected to the outer wall of one end of the insertion block (27) away from the lifting block (20).

6. The tape rewinding device with slitting function according to claim 5, characterized in that: An anti-slip rod (30) is slidably connected to the middle position of the guide rail (26), and two ends of the anti-slip rod (30) are respectively fixed to two ends of the slide groove (29), and the reset elastic member (31) is sleeved on one end of the anti-slip rod (30) away from the lifting block (20).

7. The tape rewinding device with slitting function according to claim 4, characterized in that: The end of the guide rail (26) is trapezoidal, the end of the insert block (27) close to the lifting block (20) is conical, and the lower end of the lifting block (20) is arc-shaped.

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