A follow-up tube end chamfering and beveling flame processing device

Abstract

This invention provides a follow-up flame cutting device for beveling pipe ends, including a flame cutting torch and a support. The support includes a column, a cross slide mechanism, a bracket, and a follow-up rotary mechanism. The cross slide mechanism is mounted on the top of the column, the follow-up rotary mechanism is mounted on the cross slide mechanism, the bracket is mounted on the follow-up rotary mechanism, and the flame cutting torch is mounted on the bracket. This invention, by setting a follow-up rotary cantilever and a cantilever counterweight wheel, utilizes the lever principle. Through gravity, the torch head remains firmly attached to the steel pipe wall. The follow-up function is continuously effective, effectively driving the cutting torch head to move with the changing position of the pipe wall, ensuring the torch head is always at a consistent distance from the pipe wall. This results in a stable and reliable cutting process, improving the beveling quality and geometric accuracy of ultra-large diameter steel pipes, and eliminating the problem of misaligned beveling dimensions caused by equipment malfunctions.

Description

Technical Field

[0001] This invention belongs to the technical field of spiral welded pipe end beveling process equipment, specifically relating to a follow-up pipe end beveling flame processing device. Background Technology

[0002] In recent years, there have been two methods for beveling the ends of ultra-large diameter steel pipes used in social water transmission pipeline projects. One method involves mechanically processing the pipe end bevels using a beveling machine, but this method has high investment costs and a long procurement cycle. The other method is flame cutting beveling, which has lower equipment investment costs, but it is difficult to control the geometric dimensional accuracy of the bevel, and it requires a high level of experience and technical skill from the operators. Summary of the Invention

[0003] The purpose of this invention is to provide a follow-up pipe end beveling flame processing device to overcome the above-mentioned technical problems existing in the prior art.

[0004] Therefore, the technical solution provided by the present invention is as follows: A follow-up pipe end beveling flame processing device includes a flame cutting gun and a support. The support includes a column, a cross slide mechanism, a bracket and a follow-up rotation mechanism. The cross slide mechanism is installed on the top of the column, the follow-up rotation mechanism is installed on the cross slide mechanism, the bracket is installed on the follow-up rotation mechanism and the flame cutting gun is installed on the bracket.

[0005] The cross slide mechanism includes a transverse moving seat, a longitudinal moving seat slidably connected to the transverse moving seat, and a longitudinal moving plate slidably connected to the longitudinal moving seat.

[0006] The follower rotary mechanism is mounted on the cross slide mechanism via a vertical plate and a connecting plate. The upper end of the vertical plate is rotatably connected to the follower rotary mechanism, and the lower end of the vertical plate is fixedly connected to the horizontally arranged connecting plate. The connecting plate is fixedly connected to the cross slide mechanism.

[0007] The follower rotary mechanism includes a follower rotary long shaft, a follower rotary cantilever, and a cantilever counterweight wheel. The follower rotary cantilever is a downward-curved V-shaped plate. The follower rotary cantilever includes a horizontal part and an inclined part. One end of the horizontal part is connected to the inclined part. The cantilever counterweight wheel is installed at the other end of the horizontal part. The follower rotary long shaft is located inside the horizontal part. The upper part of the vertical plate has a through hole located inside the horizontal part. The follower rotary long shaft passes through the through hole and is connected to the vertical plate through a rotary shaft fixing sleeve. A positioning sleeve is fitted on the follower rotary long shaft. The positioning sleeve is fixed to the follower rotary long shaft by a locking screw.

[0008] The top of the cross slide mechanism is provided with a T-slot, and the connecting plate is connected to the cross slide mechanism by bolts, with the head of the bolt located in the T-slot.

[0009] The inclined portion is provided with multiple adjustment holes, which are equally spaced along the length of the inclined portion. The bracket is connected to the follow-up rotary cantilever via an adjustment shaft passing through the adjustment holes.

[0010] The bracket is equipped with a limiting mechanism, which includes a telescopic top rod and a universal bullseye bearing. One end of the telescopic top rod is fixedly connected to the bracket, and the other end of the telescopic top rod is threadedly connected to the universal bullseye bearing.

[0011] The flame cutting gun is equipped with a positioning sleeve two. The upper part of the positioning sleeve two is fitted onto the flame cutting gun and is provided with a gun head angle locking knob. The lower part is cylindrical and has a mating shaft inside. The mating shaft is fixedly connected to the bracket. The cylindrical part is provided with a locking knob.

[0012] The upper surface of the transverse moving seat is provided with a transverse dovetail groove. The transverse moving seat and the longitudinal moving seat are fitted together through the transverse dovetail groove. A transverse sliding screw is installed on the transverse moving seat. One end of the transverse sliding screw is connected to a transverse sliding handwheel, and the other end is connected to a transverse screw nut. The transverse screw nut is connected to the lower surface of the longitudinal moving seat. The upper surface of the longitudinal moving seat has a longitudinal dovetail groove. The longitudinal moving seat and the longitudinal moving plate are fitted together through the longitudinal dovetail groove. A longitudinal moving screw is installed on the longitudinal moving seat. One end of the longitudinal moving screw is connected to a longitudinal moving handwheel, and the other end is connected to a longitudinal screw nut. The longitudinal screw nut is connected to the lower surface of the longitudinal moving plate.

[0013] The beneficial effects of this invention are: The following-motion pipe end beveling flame processing device provided by this invention, by setting up a following-motion rotating cantilever and a cantilever counterweight wheel, utilizes the lever principle and gravity to ensure that the cutting head is always in close contact with the steel pipe wall. The following-motion function is continuously effective, and can effectively drive the cutting head to follow the position changes with the pipe wall, so that the distance between the cutting head and the pipe wall is always consistent. The cutting process is stable and reliable, improving the processing quality of beveling of ultra-large diameter steel pipes and the geometric accuracy of the pipe end, and eliminating the problem of pipe end beveling geometry discrepancies caused by equipment failure.

[0014] This invention, through its follow-up rotary mechanism, enables the follow-up rotary arm to be quickly lifted upwards by manual operation when the flame cutting state of the torch head is abnormal, thereby causing the flame cutting torch at the other end of the arm to quickly detach from the tube body and preventing the torch head from being burned.

[0015] In this follow-up pipe end chamfering flame processing device, the follow-up rotary cantilever is a downward-curved V-shaped plate, and the follow-up rotary long axis is designed in a high position, which enhances the function of the low center of gravity suspension mechanism of the flame cutting gun head and effectively improves the follow-up effect of the mechanism.

[0016] This invention utilizes a cross-slide mechanism to enable rapid horizontal and vertical cutting movements, facilitating track changes and meeting the technical operational requirements of cutting work. Through the adjustment holes on the follow-up rotary cantilever, the gun head angle locking knob on the positioning sleeve, and the locking knob on the lower cylindrical part, the distance, vertical angle, and horizontal angle of the flame cutting gun head can be adjusted, achieving three-dimensional adjustment and precise machining of the beveling at the pipe end.

[0017] The following will provide a more detailed explanation in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of one embodiment of the present invention; Figure 2 This is a side view of one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention in use.

[0019] In the diagram: 1. Column; 2. Longitudinal moving plate; 3. Connecting plate; 4. Vertical plate; 5. Rotary shaft fixing sleeve; 6. Positioning sleeve one; 7. Follow-up rotating long shaft; 8. Follow-up rotating cantilever; 9. Bracket; 10. Gun head angle locking knob; 11. Telescopic top rod; 12. Flame cutting gun; 13. Cantilever counterweight wheel; 14. Steel pipe rotating roller conveyor; 15. Longitudinal moving seat; 16. Lateral moving seat; 17. Lateral moving handwheel; 18. Longitudinal moving handwheel; 19. Bolt; 20. Adjusting shaft; 21. Adjusting hole; 22. Locking knob; 23. Positioning sleeve two; 24. Universal bullseye bearing; 25. Screw; 26. Locking set screw; 27. Steel pipe. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0021] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0022] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0023] Example 1: This embodiment provides a follow-up pipe end chamfering flame processing device, including a flame cutting gun 12 and a bracket. The bracket includes a column 1, a cross slide mechanism, a bracket 9 and a follow-up rotary mechanism. The cross slide mechanism is installed on the top of the column 1, the follow-up rotary mechanism is installed on the cross slide mechanism, the bracket 9 is installed on the follow-up rotary mechanism, and the flame cutting gun 12 is installed on the bracket 9.

[0024] In this embodiment, the column 1 is an 8mm thick-walled 60×80mm rectangular steel pipe 27. The column 1 ensures the working stability of the device. The cross slide mechanism is fixedly connected to the column 1 with screws. The cross slide mechanism drives the flame cutting gun 12 to perform rapid cutting lateral and longitudinal movements through the follow-up rotation mechanism and the bracket 9, realizing track changing and meeting the technical operation requirements of the cutting work. The follow-up rotation mechanism makes the flame cutting gun 12 follow the position change of the pipe wall, so that the distance between the gun head and the pipe wall is always consistent. It can accurately process the beveling of the pipe end, and the cutting process is stable and reliable. It improves the processing quality of the beveling of the ultra-large diameter steel pipe 27 and the geometric accuracy of the pipe end, and eliminates the problem of inconsistent pipe end beveling geometry caused by equipment reasons.

[0025] Example 2: Based on Embodiment 1, this embodiment provides a follow-up pipe end chamfering flame processing device. The cross slide mechanism includes a transverse moving seat 16, a longitudinal moving seat 15 slidably connected to the transverse moving seat 16, and a longitudinal moving plate 2 slidably connected to the longitudinal moving seat 15.

[0026] The longitudinal moving seat 15 drives the longitudinal moving plate 2 to move laterally along the transverse moving seat 16. After moving to the desired position, the longitudinal moving plate 2 moves longitudinally along the longitudinal moving seat 15, thereby enabling the flame cutting gun 12 to perform rapid cutting transverse and longitudinal movements through the follow-up rotary mechanism and bracket 9, and realizing lane changing adjustment.

[0027] Example 3: Based on Embodiment 1, this embodiment provides a follow-up pipe end chamfering flame processing device. The follow-up rotary mechanism is mounted on the cross slide mechanism through the vertical plate 4 and the connecting plate 3. The upper end of the vertical plate 4 is rotatably connected to the follow-up rotary mechanism, and the lower end of the vertical plate 4 is fixedly connected to the horizontally arranged connecting plate 3. The connecting plate 3 is fixedly connected to the cross slide mechanism.

[0028] like Figure 1 As shown, the upright plate 4 and the connecting plate 3 are perpendicular to each other. The follower rotary mechanism is installed on the top of the upright plate 4, placing the follower rotary mechanism at a high position, thereby effectively improving the follower effect by utilizing gravity. Both the upright plate 4 and the connecting plate 3 are made of 16mm thick steel plate to ensure the rigidity of the device.

[0029] Example 4: Based on Example 3, this example provides a follow-up pipe end chamfering flame processing device, such as... Figure 1 As shown, the follower rotary mechanism includes a follower rotary long shaft 7, a follower rotary cantilever 8, and a cantilever counterweight wheel 13. The follower rotary cantilever 8 is a downward-curved V-shaped plate. The follower rotary cantilever 8 includes a horizontal part and an inclined part. One end of the horizontal part is connected to the inclined part. The cantilever counterweight wheel 13 is installed at the other end of the horizontal part. The follower rotary long shaft 7 is located in the horizontal part. The upper part of the vertical plate 4 has a through hole and is located in the horizontal part. The follower rotary long shaft 7 passes through the through hole and is connected to the vertical plate 4 through a rotary shaft fixing sleeve 5. A positioning sleeve 6 is sleeved on the follower rotary long shaft 7. The positioning sleeve 6 is fixed to the follower rotary long shaft 7 by a locking screw 26.

[0030] The rotating shaft fixing sleeve 5 is welded integrally with the follower rotating cantilever 8. The follower rotating long shaft 7 passes through the rotating shaft fixing sleeve 5. The positioning sleeve 6 can be fixed to the follower rotating long shaft 7 by locking screw 26, so that the rotating shaft fixing sleeve 5, positioning sleeve 6, and follower rotating long shaft 7 are tightly connected, ensuring that the mechanical clearance of the follower rotating cantilever 8 is small when it swings. The positioning sleeve 6 can also be removed by loosening the locking screw 26, which allows the rotating shaft fixing sleeve 5, positioning sleeve 6, and follower rotating long shaft 7 to be temporarily separated for maintenance.

[0031] In this embodiment, the mechanical rigidity of the entire device is fundamental to ensuring the proper functioning of the follow-up mechanism. Therefore, by tightening the set screw 26, the mechanical clearance between the rotating shaft fixing sleeve 5, the positioning sleeve 6, and the follow-up rotating long shaft 7 is minimized. Both the follow-up rotating long shaft 7 and the follow-up rotating cantilever 8 are made of 16mm thick steel plates to ensure rigidity and avoid the influence of various external vibrations on the mechanism. The follow-up rotating cantilever 8 is a downward-curved V-shaped plate, and the follow-up rotating long shaft 7 is designed in a high position, which strengthens the low center of gravity suspension mechanism of the 12-head flame cutting gun and effectively improves the follow-up effect of the mechanism.

[0032] Working principle: This device utilizes the lever principle. Under the action of gravity, the cantilever counterweight wheel 13 installed at one end of the follower rotary cantilever 8 moves downward, causing the other side of the follower rotary cantilever 8 to swing upward around the follower rotary long axis 7. This drives the flame cutting gun 12 to approach the steel pipe 27 to the upper right and keep it close to the pipe wall. This allows the flame cutting gun 12 to continuously follow the position of the pipe wall, thereby performing beveling and cutting of the pipe end. The cutting process is stable and reliable, improving the beveling quality of the ultra-large diameter steel pipe 27 and the geometric accuracy of the pipe end.

[0033] The cantilever counterweight wheel 13 allows for rapid emergency retraction of the flame cutting gun 12 heads in an emergency, achieved manually. For example... Figure 3 As shown, when the flame cutting gun head is in an abnormal working state, the follower slewing arm 8, which is equipped with the cantilever counterweight wheel 13, is lifted up quickly by manual operation, so that the other side of the follower slewing arm 8 swings down around the follower slewing long axis 7, thereby allowing the flame cutting gun 12 to quickly detach from the tube body and prevent the gun head from being burned. Figure 3 In the process, the steel pipe rotating roller conveyor 14 is installed and fixed on the ground and connected to the motor. During operation, after the motor is started to start the pipe cutting work, the steel pipe rotating roller conveyor 14 drives the steel pipe 27 to rotate at a steady speed, providing a stable matching speed for the cutting work.

[0034] After the grinding work is completed, when the steel pipe 27 leaves, the follow-up rotary cantilever 8 uses the follow-up rotary long shaft 7 as the fulcrum, and the flame cutting gun 12 and the end of the cantilever counterweight wheel 13 will be at the same horizontal height. The humanized design makes the device assembly look beautiful in standby mode, which meets the requirements of composite engineering aesthetics.

[0035] Example 5: Based on Example 3, this example provides a follow-up pipe end chamfering flame processing device, such as... Figure 2 As shown, the top of the cross slide mechanism is provided with a T-shaped groove, and the connecting plate 3 is connected to the cross slide mechanism by bolts 19, the head of which is located in the T-shaped groove.

[0036] like Figure 1 As shown, the upright plate 4 is in the middle of the connecting plate 3. The connecting plate 3 and the T-slot of the cross slide mechanism are fastened and connected by four bolts 19. The bolts 19 can be loosened as needed to move along the T-slot.

[0037] Example 6: Based on Embodiment 4, this embodiment provides a follower-type pipe end chamfering flame processing device. The inclined portion is provided with multiple adjustment holes 21, which are equally spaced along the length of the inclined portion. The bracket 9 is connected to the follower rotary cantilever 8 through the adjustment holes 21 via the adjustment shaft 20.

[0038] like Figure 1 As shown, the height of the flame cutting gun 12 can be adjusted by changing the adjustment hole 21.

[0039] Example 7: Based on Embodiment 6, this embodiment provides a follow-up pipe end chamfering flame processing device. A limiting mechanism is installed on the bracket 9. The limiting mechanism includes a telescopic top rod 11 and a universal bull's eye bearing 24. One end of the telescopic top rod 11 is fixedly connected to the bracket 9, and the other end of the telescopic top rod 11 is threadedly connected to the universal bull's eye bearing 24.

[0040] like Figure 1 As shown, the limiting mechanism and the flame cutting torch 12 form a certain angle. The limiting mechanism allows the distance between the flame cutting torch 12 and the outer wall of the steel pipe to be 10-15mm. During processing, the steel pipe rotates, and there is a rolling connection between the steel pipe and the universal bullseye bearing 24. Utilizing the cantilever lever principle, under the action of gravity, the universal bullseye bearing 24 is subjected to an upward force, rotating and rising until the universal bullseye bearing 24 contacts the steel pipe. At the same time, the flame cutting torch 12 also moves upward.

[0041] The limiting mechanism adjusts the length of the universal bullseye bearing 24 via the telescopic top rod 11, ensuring that the universal bullseye bearing 24 is always in contact with the steel pipe, thus meeting the requirements for track changing process adjustments. The universal bullseye bearing 24 utilizes the follow-up limiting function of the flame cutting gun 12, employing the cantilever lever principle, and achieves the follow-up function through gravity acting on the universal bullseye bearing 24, overcoming the complexity and poor vibration resistance of the elastic assist template mechanism.

[0042] In this embodiment, the distance between the follow-up rotating long shaft 7 and the adjusting shaft 20 is 350mm, and the distance between the follow-up rotating long shaft 7 and the cantilever counterweight wheel 13 is 620mm, which ensures that the flame cutting gun 12 can be closely attached to the pipe wall by relying on the bullseye universal bearing, effectively realizing the follow-up main function.

[0043] Example 8: Based on Embodiment 6, this embodiment provides a follow-up pipe end chamfering flame processing device. The flame cutting gun 12 is equipped with a positioning sleeve 23. The upper part of the positioning sleeve 23 is fitted on the flame cutting gun 12 and is provided with a gun head angle locking knob 10. The lower part is cylindrical and has a mating shaft inside. The mating shaft is fixedly connected to the bracket 9. The cylindrical part is provided with a locking knob 22.

[0044] like Figure 1 As shown, the up and down tilt angle of the flame cutting gun 12 can be adjusted by the gun head angle locking knob 10. The function of the locking knob 22 is to tighten the positioning sleeve 23 to ensure that the preset gun head angle will not change.

[0045] Example 9: Based on Embodiment 2, this embodiment provides a follow-up pipe end chamfering flame processing device. The upper end face of the transverse moving seat 16 is provided with a transverse dovetail groove. The transverse moving seat 16 and the longitudinal moving seat 15 are fitted with a clearance through the transverse dovetail groove. A transverse sliding screw is installed on the transverse moving seat 16. One end of the transverse sliding screw is connected to a transverse sliding handwheel 17, and the other end is connected to a transverse screw nut. The transverse screw nut is connected to the lower end face of the longitudinal moving seat 15. The upper surface of the longitudinal moving seat 15 has a longitudinal dovetail groove. The longitudinal moving seat 15 and the longitudinal moving plate 2 are fitted together through the longitudinal dovetail groove. A longitudinal moving screw is installed on the longitudinal moving seat 15. One end of the longitudinal moving screw is connected to a longitudinal moving handwheel 18, and the other end is connected to a longitudinal screw nut seat. The longitudinal screw nut seat is connected to the lower surface of the longitudinal moving plate 2.

[0046] like Figure 2 As shown, during adjustment, the horizontal movement handwheel 17 and the vertical movement handwheel 18 are rotated respectively, which drives the horizontal movement screw and the vertical movement screw to rotate. The horizontal movement screw and the vertical movement screw respectively push the horizontal movement screw seat and the vertical movement screw seat to perform reciprocating linear motion, thereby driving the vertical movement seat 15 and the vertical movement plate 2 to move and achieve sliding adjustment.

[0047] In summary, the follow-up pipe end beveling flame processing device provided by this invention, by setting up a follow-up rotating cantilever 8 and a cantilever counterweight wheel 13, utilizes the lever principle and gravity to ensure that the cutting head is always in close contact with the steel pipe 27 wall. The follow-up function is continuously effective, effectively driving the cutting head to follow the position changes with the pipe wall, achieving a consistent distance between the cutting head and the pipe wall, ensuring a stable and reliable cutting process, improving the processing quality and geometric accuracy of the beveling of ultra-large diameter steel pipes 27, and eliminating the problem of inconsistent pipe end beveling geometry caused by equipment malfunctions.

[0048] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A follow-up pipe end beveling flame processing device, comprising a flame cutting torch, characterized in that: It also includes a support frame, which includes a column, a cross slide mechanism, a bracket, and a follower rotation mechanism. The cross slide mechanism is installed on the top of the column, the follower rotation mechanism is installed on the cross slide mechanism, the bracket is installed on the follower rotation mechanism, and the flame cutting gun is installed on the bracket. The follower rotary mechanism is mounted on the cross slide mechanism via a vertical plate and a connecting plate. The upper end of the vertical plate is rotatably connected to the follower rotary mechanism, and the lower end of the vertical plate is fixedly connected to the horizontally arranged connecting plate. The connecting plate is fixedly connected to the cross slide mechanism. The follower rotary mechanism includes a follower rotary long shaft, a follower rotary cantilever, and a cantilever counterweight wheel. The follower rotary cantilever is a downward-curved V-shaped plate. The follower rotary cantilever includes a horizontal part and an inclined part. One end of the horizontal part is connected to the inclined part. The cantilever counterweight wheel is installed at the other end of the horizontal part. The follower rotary long shaft is located inside the horizontal part. The upper part of the vertical plate has a through hole located inside the horizontal part. The follower rotary long shaft passes through the through hole and is connected to the vertical plate through a rotary shaft fixing sleeve. A positioning sleeve is fitted on the follower rotary long shaft. The positioning sleeve is fixed to the follower rotary long shaft by a locking screw. The bracket is equipped with a limiting mechanism, which includes a telescopic top rod and a universal bull's eye bearing. One end of the telescopic top rod is fixedly connected to the bracket, and the other end of the telescopic top rod is threadedly connected to the universal bull's eye bearing. The flame cutting gun is equipped with a positioning sleeve two. The upper part of the positioning sleeve two is fitted onto the flame cutting gun and is provided with a gun head angle locking knob. The lower part is cylindrical and has a mating shaft inside. The mating shaft is fixedly connected to the bracket. The cylindrical part is provided with a locking knob.

2. The follow-up pipe end chamfering flame processing device according to claim 1, characterized in that: The cross slide mechanism includes a transverse moving seat, a longitudinal moving seat slidably connected to the transverse moving seat, and a longitudinal moving plate slidably connected to the longitudinal moving seat.

3. The follow-up pipe end chamfering flame processing device according to claim 1, characterized in that: The top of the cross slide mechanism is provided with a T-slot, and the connecting plate is connected to the cross slide mechanism by bolts, with the head of the bolt located in the T-slot.

4. The follow-up pipe end chamfering flame processing device according to claim 1, characterized in that: The inclined portion is provided with multiple adjustment holes, which are equally spaced along the length of the inclined portion. The bracket is connected to the follow-up rotary cantilever via an adjustment shaft passing through the adjustment holes.

5. The follow-up pipe end chamfering flame processing device according to claim 2, characterized in that: The upper surface of the transverse moving seat is provided with a transverse dovetail groove. The transverse moving seat and the longitudinal moving seat are fitted together through the transverse dovetail groove. A transverse sliding screw is installed on the transverse moving seat. One end of the transverse sliding screw is connected to a transverse sliding handwheel, and the other end is connected to a transverse screw nut. The transverse screw nut is connected to the lower surface of the longitudinal moving seat. The upper surface of the longitudinal moving seat has a longitudinal dovetail groove. The longitudinal moving seat and the longitudinal moving plate are fitted together through the longitudinal dovetail groove. A longitudinal moving screw is installed on the longitudinal moving seat. One end of the longitudinal moving screw is connected to a longitudinal moving handwheel, and the other end is connected to a longitudinal screw nut. The longitudinal screw nut is connected to the lower surface of the longitudinal moving plate.

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