Two-chuck laser pipe cutting machine

Abstract

The utility model relates to the technical field of laser cutting, and discloses a two-chuck laser pipe cutting machine which comprises a lathe bed, a front chuck structure and a portal frame which are arranged at the front end of the lathe bed, a laser cutting assembly arranged on the portal frame, and a rear chuck structure capable of reciprocating in the length direction of the lathe bed. A blocking box body is arranged outside the portal frame in a surrounding mode, and the laser cutting assembly is located in the blocking box body. An avoiding hole allowing the rear chuck structure to penetrate through is formed in the rear side wall of the blocking box body; a blocking door is arranged on the operation side of the blocking box body, a first blocking curtain is arranged at the lower end of the blocking door, and a second blocking curtain is arranged at the front end of the blocking box body. By means of the blocking box body, the first blocking curtain and the second blocking curtain, laser generated when the laser cutting assembly cuts a pipe is blocked, scattering and reflection of the laser in the cutting process can be effectively blocked, laser overflowing is avoided as much as possible, and therefore operators are protected.

Description

Technical Field

[0001] This utility model relates to the field of laser cutting technology, and in particular to a two-chuck laser tube cutting machine. Background Technology

[0002] For cutting pipes with a diagonal of ≤120mm and a length of ≤8000mm, a two-chuck laser pipe cutting machine can be used. This machine includes a bed, a front chuck structure and a rear chuck structure that slide on the bed, a gantry mounted on the bed, and a laser cutting assembly mounted on the gantry. However, because the laser cutting assembly in the cutting area generates laser light during pipe cutting, which can affect the operator, the cutting area needs to be protected. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a two-chuck laser tube cutting machine, which aims to block the laser generated by the laser cutting component when cutting tubes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A two-chuck laser tube cutting machine includes a bed, a front chuck structure and a gantry frame disposed at the front end of the bed, a laser cutting assembly disposed on the gantry frame, and a rear chuck structure that can reciprocate along the length of the bed; the gantry frame is surrounded by a barrier box, and the laser cutting assembly is located inside the barrier box; the rear side wall of the barrier box has an clearance hole for the rear chuck structure to pass through; the operating side of the barrier box has a barrier door, the lower end of the barrier door is provided with a first barrier curtain, and the front end of the barrier box is provided with a second barrier curtain.

[0006] The two-chuck laser tube cutting machine, wherein the barrier door can move along the front-rear direction of the barrier box; and the operating side of the barrier door is provided with a viewing window.

[0007] In the aforementioned two-chuck laser tube cutting machine, a sensing plate is provided on the upper surface of the barrier housing, and a sensing switch is provided on the upper surface of the barrier door, the sensing switch being used to sense the sensing plate.

[0008] The two-chuck laser tube cutting machine has an exhaust hole on the bed, an exhaust pipe connected to the exhaust hole, an air inlet of the exhaust pipe connected to an exhaust hood, and an air inlet of the exhaust hood facing the laser cutting assembly.

[0009] The two-chuck laser tube cutting machine includes a front chuck structure comprising a front mounting plate, a front chuck disposed on the operating side of the front mounting plate, and a drive cylinder disposed on the inner wall of the barrier box and used to drive the front mounting plate to reciprocate along the length of the bed; the cylinder body of the drive cylinder is fixedly connected to the inner wall of the barrier box, and the output end of the drive cylinder is fixedly connected to the side wall of the front mounting plate.

[0010] The two-chuck laser tube cutting machine includes a cylinder protective cover inside the barrier housing, with the cylinder body of the drive cylinder located inside the cylinder protective cover; the front hanging plate and the periphery of the front chuck are both located inside the front chuck protective cover.

[0011] The two-chuck laser tube cutting machine includes a rear chuck structure comprising a rear mounting plate, a rear chuck disposed on the operating side of the rear mounting plate, a drive motor, a drive gear disposed on the output end of the drive motor, and a drive rack meshing with the drive gear; the drive rack is disposed along the length direction of the bed; the bed is also provided with a movable guide rail extending along its length direction, and movable sliders that are slidably connected to the movable guide rail are disposed on the side walls of the front mounting plate and the rear mounting plate facing the bed.

[0012] In the aforementioned two-chuck laser tube cutting machine, the rear hanging plate, the rear end of the rear chuck, and the drive motor are all housed within the rear chuck protective cover.

[0013] The two-chuck laser tube cutting machine includes a support on the operating side of the bed. The support is equipped with a variable-diameter wheel support mechanism for supporting the tube. The variable-diameter wheel support mechanism includes a support mounting plate on the side wall of the support, a support cylinder with its cylinder body mounted on the support mounting plate and its output end facing upwards, a support lifting frame mounted on the output end of the support cylinder, a variable-diameter support roller rotatably connected to the support lifting frame, and a pin mounted on the support lifting frame. The variable-diameter support roller has multiple circumferentially distributed positioning holes on its end face, and the pin is used to insert into any of the positioning holes.

[0014] The two-chuck laser tube cutting machine includes a support on the operating side of the bed, on which a clamping mechanism for supporting and clamping the tube is mounted. The clamping mechanism includes a clamping mounting frame, a lifting cylinder mounted on the side wall of the clamping mounting frame with its output end facing upwards, a clamping lifting frame mounted on the output end of the lifting cylinder, a clamping cylinder mounted on the side wall of the clamping lifting frame with its output end facing upwards, a pull block mounted on the output end of the clamping cylinder, and a pull rod with one end rotatably connected to the pull block and the other end rotatably connected to the clamping roller. The pull rod and the clamping roller are symmetrically arranged along the vertical line of the clamping cylinder, and a gap for clamping the tube is formed between the two clamping rollers. Two clamping guide rails parallel to the moving direction of the pull rod are provided on the side wall of the clamping lifting frame facing the pull block. Clamping sliders are provided on the side walls of the two clamping rollers facing the clamping lifting frame, and the clamping sliders are slidably mounted on the corresponding clamping guide rails.

[0015] Beneficial effects:

[0016] This utility model provides a two-chuck laser tube cutting machine. By setting up a barrier box and a first barrier curtain and a second barrier curtain, the laser generated by the laser cutting component when cutting the tube is blocked, which can effectively block the scattering and reflection of the laser during the cutting process, minimize the laser leakage, and thus protect the operator. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a two-chuck laser tube cutting machine.

[0018] Figure 2 This is a schematic diagram of the barrier box structure.

[0019] Figure 3 This is a schematic diagram of the front chuck structure and the rear chuck structure.

[0020] Figure 4 This is a schematic diagram of the variable diameter wheel support mechanism and the clamping mechanism.

[0021] Key component symbols: 1-Bed, 11-Gantry frame, 12-Laser cutting assembly, 13-Exhaust duct, 14-Exhaust hood, 15-Moving guide rail, 16-Support, 17-Receiving hopper, 2-Front chuck structure, 21-Front side plate, 22-Front chuck, 23-Drive cylinder, 24-Cylinder protective cover, 25-Front chuck protective cover, 3-Rear chuck structure, 31-Rear side plate, 32-Rear chuck, 33-Drive motor, 34-Drive rack, 35-Rear chuck protective cover, 4-Variable diameter wheel support mechanism, 41- 42-Support mounting plate, 43-Support lifting frame, 44-Variable diameter support roller, 441-Positioning hole, 442-Circular arc groove, 45-Pin, 5-Clamping mechanism, 51-Clamping mounting frame, 52-Lifting cylinder, 53-Clamping lifting frame, 54-Clamping cylinder, 55-Pull block, 56-Pull rod, 57-Clamping roller, 581-Clamping guide rail, 582-Clamping slider, 6-Barrier box, 61-Induction plate, 62-Barrier door, 621-Viewing window, 63-Induction switch, 64-First barrier curtain. Detailed Implementation

[0022] This utility model provides a two-chuck laser tube cutting machine. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit the scope of protection of this utility model.

[0023] Please see Figure 1 and Figure 2 This utility model provides a two-chuck laser tube cutting machine, including a bed 1, a front chuck structure 2 and a gantry frame 11 disposed at the front end of the bed 1, a laser cutting assembly 12 disposed on the gantry frame 11, and a rear chuck structure 3 that can reciprocate along the length of the bed 1; the gantry frame 11 is surrounded by a barrier box 6, and the laser cutting assembly 12 is located inside the barrier box 6; the rear side wall of the barrier box 6 has an clearance hole for the rear chuck structure 3 to pass through; the operating side of the barrier box 6 has a barrier door 62, the lower end of the barrier door 62 is provided with a first barrier curtain 64 (the position indicated in the figure is the position where the first barrier curtain 64 is installed), and the front end of the barrier box 6 is provided with a second barrier curtain (which is blocked by the barrier door 62).

[0024] After the pipe to be processed is loaded, it is clamped by the rear chuck structure 3 and the front chuck structure 2. The rear chuck structure 3 pushes the pipe toward the laser cutting assembly 12 (i.e., forward). The laser cutting assembly 12 processes and cuts the pipe. The cut pipe can be unloaded through the receiving hopper 17 placed below the laser cutting assembly 12.

[0025] Specifically, both the first and second barrier curtains are black fireproof curtains. Black has a strong ability to block the light generated by the laser, and the fireproof curtains are made of fire-resistant materials, which can prevent the fireproof curtains from melting due to heat, thereby extending their service life. The first barrier curtain 64 is composed of multiple curtains, and its soft and deformable properties make it easy to put the receiving hopper 17 into or out of the cutting area through the first barrier curtain 64. The second barrier curtain facilitates the operator's access to the cutting area.

[0026] More specifically, both the first barrier curtain 64 and the second barrier curtain are designed to be detachable in order to ensure the blocking effect against lasers and to facilitate replacement after the first barrier curtain 64 and the second barrier curtain have been used for a period of time.

[0027] The barrier box 6, the first barrier curtain 64, and the second barrier curtain are set to block the laser generated by the laser cutting component 12 when cutting the pipe. This can effectively block the scattering and reflection of the laser during the cutting process, minimize the leakage of laser light, and thus protect the operators.

[0028] Please see Figure 2 In some embodiments, the barrier door 62 can move along the front-to-back direction of the barrier housing 6. When maintenance is required on the cutting area, the barrier door 62 can be pulled forward to open it, providing sufficient space for maintenance personnel to enter the cutting area. A viewing window 621 is provided on the operating side of the barrier door 62. During laser cutting, the operator needs to observe the cutting area in real time to understand the cutting progress, pipe cutting status, and any abnormalities. The viewing window 621 allows the operator to clearly see the operation of the laser cutting components 12 and other components inside the barrier housing 6, while ensuring their own safety.

[0029] Please see Figure 2 In some embodiments, a sensing element 61 is provided on the upper surface of the barrier housing 6, and a sensing switch 63 is provided on the upper surface of the barrier door 62. The sensing switch 63 is used to sense the sensing element 61. The sensing switch 63 is used to detect whether the barrier door 62 is fully closed. When the sensing element 61 senses the sensing switch 63, it indicates that the barrier door 62 is in a closed state; when the sensing element 61 cannot sense the sensing switch 63, it indicates that the barrier door 62 is in an open or incompletely closed state. The sensing switch 63 is electrically connected to the control mechanism. Through program settings, for example, when the barrier door 62 is in an open or incompletely closed state, the laser cutting component 12 in the pipe cutting machine cannot operate, which can prevent personnel from entering the cutting area and other personnel from operating the equipment without their knowledge, thereby improving the safety of the equipment.

[0030] Please see Figure 2 and Figure 3 In some embodiments, the bed 1 is provided with an exhaust port, through which an exhaust pipe 13 is connected. The exhaust pipe 13's outlet is connected to the exhaust mechanism, and its inlet is connected to an exhaust hood 14. The exhaust hood 14's inlet faces the laser cutting assembly 12. This arrangement allows harmful gases and dust generated in the cutting area to be promptly removed, preventing them from affecting the operator's health and reducing environmental impact. Furthermore, the exhaust hood 14 provides a certain degree of obstruction, preventing large debris (such as iron filings / blocks) from being sucked into the exhaust pipe 13 and entering the exhaust mechanism, thus avoiding damage to the exhaust mechanism.

[0031] Please see Figure 3 In some embodiments, the front chuck structure 2 includes a front mounting plate 21, a front chuck 22 disposed on the operating side of the front mounting plate 21, and a drive cylinder 23 disposed on the inner wall of the barrier housing 6 and used to drive the front mounting plate 21 to reciprocate along the length direction of the bed 1. The cylinder body of the drive cylinder 23 is fixedly connected to the inner wall of the barrier housing 6, and the output end of the drive cylinder 23 is fixedly connected to the side wall of the front mounting plate 21. By extending and retracting the output end of the drive cylinder 23, the front mounting plate 21 and the front chuck 22 can be driven to move back and forth backward and forward. The movement of the front chuck 22 is controlled by the drive cylinder 23. Under the premise of ensuring accuracy and cutting effect, the production and use costs are lower than those of using a servo motor.

[0032] Please see Figure 3 In some embodiments, a cylinder guard 24 is provided inside the barrier housing 6, and the cylinder body of the drive cylinder 23 is located inside the cylinder guard 24; please refer to Figure 2 The front mounting plate 21 and the periphery of the front chuck 22 are both disposed within the front chuck protective cover 25. The cylinder protective cover 24 encloses the drive cylinder 23, thereby preventing damage to the drive cylinder 23 from the high-energy laser emitted by the laser cutting assembly 12 and extending the service life of the drive cylinder 23. Similarly, the front chuck protective cover 25 also protects the transmission components of the front chuck structure 2.

[0033] Please see Figure 3In some embodiments, the rear chuck structure 3 includes a rear mounting plate 31, a rear chuck 32 disposed on the operating side of the rear mounting plate 31, a drive motor 33, a drive gear disposed on the output end of the drive motor 33 (covered by the rear mounting plate 31), and a drive rack 34 meshing with the drive gear; the drive rack 34 is disposed along the length direction of the bed 1; the bed 1 is also provided with a moving guide rail 15 extending along its length direction, and the front mounting plate 21 and the rear mounting plate 31 are each provided with a sliding slider (covered by the front mounting plate 21 and the rear mounting plate 31) slidably connected to the moving guide rail 15 on their side walls facing the bed 1. Since the rear chuck 32 has a large travel range, the drive motor 33 is used to drive the drive gear to rotate, and the drive rack 34 is used to provide movement guidance for the drive gear, so that the rear mounting plate 31 and the rear chuck 32 can move back and forth smoothly along the length direction of the bed 1. The movable guide rail 15 is set so that the front chuck structure 2 and the rear chuck structure 3 share the same set of movable guide rail 15, which can ensure that the horizontality of the moving path of the front chuck structure 2 and the rear chuck structure 3 is consistent, and can also reduce manufacturing costs.

[0034] Please see Figure 2 In some embodiments, the rear mounting plate 31, the rear end of the rear chuck 32, and the drive motor 33 are all housed within the rear chuck protective cover 35. Similarly, the rear chuck protective cover 35 is provided to protect the transmission components of the rear chuck structure 3.

[0035] Please see Figure 1 and Figure 4 In some embodiments, the operating side of the bed 1 is further provided with a support 16, and the support 16 is provided with a variable diameter wheel support mechanism 4 for supporting the pipe. The variable diameter wheel support mechanism 4 includes a support mounting plate 41 disposed on the side wall of the support 16, a support cylinder 42 with its cylinder body disposed on the support mounting plate 41 and its output end facing upward, a support lifting frame 43 disposed on the output end of the support cylinder 42, a variable diameter support wheel 44 rotatably connected to the support lifting frame 43, and a pin 45 disposed on the support lifting frame 43. The end face of the variable diameter support wheel 44 is provided with a plurality of positioning holes 441 distributed circumferentially, and the pin 45 is used to insert into any of the positioning holes 441. The reducing roller 44 has an arc groove 442 along its circumference in the middle. The opening of the arc groove 442 gradually increases in size along the circumference. Therefore, the reducing roller 44 can be rotated to face upwards according to the diameter of the pipe to be processed, corresponding to the arc groove 442. Then, the reducing roller 44 is fixed by inserting the pin 45 into the corresponding positioning hole 441. After the reducing roller 44 is adjusted, the extending or retracting of the output end of the support cylinder 42 enables the reducing roller 44 to support the pipe.

[0036] Specifically, two variable diameter wheel support mechanisms 4 are provided along the length of the bed 1, and the two variable diameter wheel support mechanisms 4 are located close to the front chuck structure 2.

[0037] Please see Figure 1 and Figure 4 In some embodiments, the operating side of the bed 1 is further provided with a support 16, and the support 16 is provided with a clamping mechanism 5 for supporting the pipe and clamping the pipe accordingly; the clamping mechanism 5 includes a clamping mounting frame 51, a lifting cylinder 52 disposed on the side wall of the clamping mounting frame 51 with its output end facing upward, a clamping lifting frame 53 disposed on the output end of the lifting cylinder 52, a clamping cylinder 54 disposed on the side wall of the clamping lifting frame 53 with its output end facing upward, and a pull block 55 disposed on the output end of the clamping cylinder 54 (since the output end of the clamping cylinder 54 in the figure is in a retracted state, the output end of the clamping cylinder 54 in the figure is not connected to the pull block). The clamping cylinder 54 is connected to the pull block 55 at one end and the clamping roller 57 at the other end. The pull rod 56 and the clamping roller 57 are symmetrically arranged along the vertical line of the clamping cylinder 54, and a gap for clamping the pipe is formed between the two clamping rollers 57. The clamping lifting frame 53 is provided with two clamping guide rails 581 parallel to the moving direction of the pull rod 56 on the side wall facing the pull block 55. Each of the two clamping rollers 57 is provided with a clamping slider 582 on the side wall facing the clamping lifting frame 53. The clamping slider 582 is slidably disposed on the corresponding clamping guide rail 581. When loading is required, the lifting cylinder 52 drives the clamping lifting frame 53 to rise, and the upper surface of the clamping lifting frame 53 contacts the lower end face of the pipe. The clamping cylinder 54 operates, pulling the two pull rods 56, causing the two clamping rollers 57 to move closer together and clamp the pipe, making the pipe concentric with the front chuck structure 2 and the rear chuck structure 3. The front chuck structure 2 and the rear chuck structure 3 can then be used to clamp and position the pipe. When cutting the pipe, the extension or retraction of the output end of the lifting cylinder 52 and the output end of the clamping cylinder 54 enables the pipe to be supported vertically and horizontally. This function of supporting vertically and horizontally is suitable for processing non-circular pipes.

[0038] Specifically, four clamping mechanisms 5 are provided along the length of the bed 1.

[0039] In summary, this utility model, through the setting of the barrier box 6 and the first barrier curtain 64 and the second barrier curtain, blocks the laser generated by the laser cutting component 12 when cutting the pipe, which can effectively block the scattering and reflection of the laser during the cutting process, minimize the laser leakage, and thus protect the operator.

[0040] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0041] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A two-chuck laser tube cutting machine, comprising a bed, a front chuck structure and a gantry mounted at the front end of the bed, a laser cutting assembly mounted on the gantry, and a rear chuck structure capable of reciprocating along the length of the bed; characterized in that, The gantry is surrounded by a barrier box, and the laser cutting assembly is located inside the barrier box. The rear side wall of the barrier box has an clearance hole for the rear chuck structure to pass through. The operating side of the barrier box has a barrier door, the lower end of which is provided with a first barrier curtain, and the front end of the barrier box is provided with a second barrier curtain.

2. The two-chuck laser tube cutting machine according to claim 1, characterized in that, The barrier door can move along the front and back direction of the barrier box; and the operating side of the barrier door is provided with a viewing window.

3. The two-chuck laser tube cutting machine according to claim 2, characterized in that, The upper surface of the barrier box is provided with a sensor plate, and the upper surface of the barrier door is provided with a sensor switch, which is used to sense the sensor plate.

4. The two-chuck laser tube cutting machine according to claim 1, characterized in that, The bed frame is provided with an exhaust hole, and an exhaust pipe is connected to the exhaust hole. The air inlet of the exhaust pipe is connected to the exhaust hood, and the air inlet of the exhaust hood faces the laser cutting assembly.

5. The two-chuck laser tube cutting machine according to claim 1, characterized in that, The front chuck structure includes a front mounting plate, a front chuck disposed on the operating side of the front mounting plate, and a drive cylinder disposed on the inner wall of the barrier box and used to drive the front mounting plate to reciprocate along the length direction of the bed; the cylinder body of the drive cylinder is fixedly connected to the inner wall of the barrier box, and the output end of the drive cylinder is fixedly connected to the side wall of the front mounting plate.

6. The two-chuck laser tube cutting machine according to claim 5, characterized in that, The barrier housing is equipped with a cylinder guard, and the cylinder body of the drive cylinder is located inside the cylinder guard; the front mounting plate and the periphery of the front chuck are both located inside the front chuck guard.

7. The two-chuck laser tube cutting machine according to claim 5, characterized in that, The rear chuck structure includes a rear mounting plate, a rear chuck and a drive motor disposed on the operating side of the rear mounting plate, a drive gear disposed on the output end of the drive motor, and a drive rack meshing with the drive gear; the drive rack is disposed along the length direction of the bed; the bed is also provided with a movable guide rail extending along its length direction, and movable sliders that are slidably connected to the movable guide rail are disposed on the side walls of the front mounting plate and the rear mounting plate facing the bed.

8. The two-chuck laser tube cutting machine according to claim 7, characterized in that, The rear side mounting plate, the rear end of the rear chuck, and the drive motor are all housed inside the rear chuck protective cover.

9. The two-chuck laser tube cutting machine according to claim 1, characterized in that, The operating side of the bed is also provided with a support, and the support is provided with a variable diameter wheel support mechanism for supporting the pipe. The variable diameter wheel support mechanism includes a support mounting plate provided on the side wall of the support, a support cylinder with its cylinder body provided on the support mounting plate and its output end facing upward, a support lifting frame provided on the output end of the support cylinder, a variable diameter support wheel rotatably connected to the support lifting frame, and a pin provided on the support lifting frame. The end face of the variable diameter support wheel is provided with a plurality of positioning holes distributed circumferentially, and the pin is used to insert into any of the positioning holes.

10. The two-chuck laser tube cutting machine according to claim 1, characterized in that, The operating side of the bed is also provided with a support, on which a clamping mechanism for supporting and clamping the pipe is provided. The clamping mechanism includes a clamping mounting frame, a lifting cylinder with its output end facing upward on the side wall of the clamping mounting frame, a clamping lifting frame with its output end facing upward on the output end of the lifting cylinder, a clamping cylinder with its output end facing upward on the side wall of the clamping lifting frame, a pull block with its output end facing upward on the output end of the clamping cylinder, and a pull rod with one end rotatably connected to the pull block and the other end rotatably connected to the clamping roller. The pull rod and the clamping roller are symmetrically arranged along the vertical line of the clamping cylinder, and a gap for clamping the pipe is formed between the two clamping rollers. The side wall of the clamping lifting frame facing the pull block is provided with two clamping guide rails parallel to the moving direction of the pull rod. Each of the two clamping rollers is provided with a clamping slider on the side wall facing the clamping lifting frame, and the clamping slider is slidably disposed on the corresponding clamping guide rail.

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