A kind of intersection line projection line drawing device and line drawing method

Abstract

The application is a kind of intersection line projection line drawing device and line drawing method, comprising two steel pipe support frames, steel pipe fixing mechanism, angle adjusting mechanism and line drawing mechanism; the steel pipe fixing mechanism is arranged on the steel pipe support frame, the steel pipe to be cut is supported outside the steel pipe fixing mechanism, the end of the steel pipe fixing mechanism is fixedly installed with the angle adjusting mechanism, the main shaft direction of the angle adjusting mechanism is consistent with the direction of the intersection main pipe, and the two ends of the angle adjusting mechanism are respectively connected with the line drawing mechanism. The rotation of the line drawing mechanism can obtain the lofting contour line of the edge line of the main pipe on the pipe, and the connection of the contour line can complete the line drawing work of the intersection line. The structure is clear, the line drawing position is accurate, and the application range is wide. The application is suitable for steel pipes of different sizes in bridge construction, and has the advantages of simple and convenient production, low material cost and recycling.

Description

Technical Field

[0001] This invention relates to the field of steel pipe structure construction technology, and in particular to an intersection line projection drawing device and drawing method. Background Technology

[0002] In bridge construction, scaffolding is an indispensable temporary structure, and among these temporary structures, steel pipe scaffolding is extremely common. To ensure construction efficiency and the safety and stability of the scaffolding, quickly and accurately determining the intersection point of the steel pipes is crucial for subsequent steel pipe processing and installation.

[0003] Typically, the task of identifying and machining these intersection lines is accomplished using advanced CNC lathes. While this technology can effectively handle the cutting of multi-angle intersection lines, for the machining of steel pipe components on the construction site, transporting pre-purchased steel pipe materials to a machining workshop equipped with CNC lathes, or setting up such a machining workshop on the construction site, is both unfavorable to the construction schedule and incurs considerable additional costs. Therefore, finding a more economical and flexible way to address the identification and machining of steel pipe intersection lines in on-site construction has become a pressing problem in the industry. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provides an intersecting line projection drawing device and drawing method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a projection drawing device for intersecting lines, comprising: two steel pipe support frames, a steel pipe fixing mechanism, an angle adjustment mechanism, and a drawing mechanism; the steel pipe fixing mechanism is mounted on the steel pipe support frames, the steel pipe to be cut is supported on the outside of the steel pipe fixing mechanism, the angle adjustment mechanism is fixedly installed at the end of the steel pipe fixing mechanism, the main axis direction of the angle adjustment mechanism is consistent with the direction of the intersecting main pipe, and the drawing mechanism is connected to both ends of the angle adjustment mechanism.

[0006] Furthermore, the steel pipe support frame includes two vertically arranged I-beams and one horizontally arranged channel steel slide rail. The tops of the two I-beams are welded to the outside of the web of the channel steel slide rail, and the web height of the I-beams is less than the web height of the channel steel slide rail.

[0007] Furthermore, the steel pipe fixing mechanism includes four lower sliders, four lower slider connecting plates, four upper sliders, four upper slider connecting plates, four parallel round steel rods, and supporting reinforcing bars. The width of the lower sliders is slightly smaller than the width of the channel steel slide rails. The lower sliders are respectively locked in pairs in the front and rear channel steel slide rails. The upper ends of the lower sliders are fixedly connected to the lower slider connecting plates. The sides of the upper slider connecting plates and the lower slider connecting plates are provided with several pin holes and connected by pin shafts. The upper slider connecting plates are fixedly connected to the lower ends of the upper sliders. The two ends of the two round steel rods are respectively connected to the upper inner side of the upper slider connecting plates, and the two ends of the other two round steel rods are respectively connected to the lower inner side of the lower slider connecting plates. The cylindrical surface of the round steel rods is in close contact with the inner cylindrical surface of the steel pipe to be cut. The upper slider connecting plates and the lower slider connecting plates are fixed in relative positions by supporting reinforcing bars.

[0008] Furthermore, the steel pipe fixing mechanism also includes: four longitudinal extension rods, eight vertical connecting rods, and two connecting rod connecting plates. Two of the longitudinal extension rods are fixedly connected to the upper outer side of the upper sliding block connecting plate, and the other two longitudinal extension rods are fixedly connected to the lower outer side of the lower sliding block connecting plate. Each longitudinal extension rod has a connecting rod through hole at its middle and outer ends, and is rotatably connected to a vertical connecting rod. The four corners of the connecting rod connecting plate have connecting rod through holes that are rotatably connected to the other end of the vertical connecting rod. The spacing between the upper and lower connecting rod through holes of the connecting rod connecting plate is the same as the spacing between the connecting rod through holes on the longitudinal extension rods.

[0009] Furthermore, the steel pipe fixing mechanism also includes: four transverse connecting rods and an axial positioning sleeve. The inner center of the connecting rod connecting plate is provided with two opening connecting lugs that are rotatably connected to the transverse connecting rods. The axial positioning sleeve is provided with two opening connecting plates on each side and is rotatably connected to the transverse connecting rods. The spacing between the through holes of the connecting lugs of the connecting rod connecting plate is the same as the spacing between the through holes of the connecting plate on the same side of the axial positioning sleeve. An angle scale is provided at the end of the axial positioning sleeve.

[0010] Furthermore, the angle adjustment mechanism includes: a connecting rod, a threaded rod, an L-shaped connecting rod, and a rotating spindle seat. The connecting rod is fixedly connected to the axial positioning sleeve by a nut. Both ends of the connecting rod are screwed to the threaded rod, and the other end of the threaded rod is screwed to the L-shaped connecting rod. The L-shaped connecting rod is fixedly connected to the rotating spindle seat by a positioning pin. An angle pointing plate is provided in the middle of the connecting rod.

[0011] Furthermore, the line drawing mechanism includes: a sleeve, a fixed end rod, a positioning bolt, and a laser pointer. The sleeve is rotatably connected to the rotating spindle seat. The sleeve is sleeved outside the fixed end rod and fixedly connected by the positioning bolt. The laser pointer is inserted through the end of the fixed end rod.

[0012] A method for drawing intersection lines by projection, the steps of which are as follows: S1. Install steel pipe support frame and steel pipe fixing mechanism to support the steel pipe to be cut; S2. Install the angle adjustment mechanism, fix the connecting rod to the axial positioning sleeve, and adjust the angle of the angle pointing to the angle scale to be consistent with the designed intersection angle; S3. Adjust the lateral length of the angle adjustment mechanism to make the lateral length of the angle adjustment mechanism compatible with the diameter of the steel pipe to be cut; S4. Adjust the length of the marking mechanism so that the length of the marking mechanism is consistent with the radius of the intersecting steel pipe, and fix the positioning bolt; S5. Rotate the drawing mechanisms at both ends to the same angle and avoid the steel pipe to be cut, turn on the laser pointer, and adjust the longitudinal length of the angle adjustment mechanism so that the two lasers overlap. S6. The rotating line mechanism uses a laser pointer to draw a closed intersection line on the steel pipe to be cut.

[0013] Furthermore, S1 specifically includes: S11. Erect a steel pipe support frame and weld and fix the I-beams and channel steel slide rails. S12. Place the steel pipe to be cut around the round steel rod, place the lower slider inside the channel steel slide rail, and align the upper slider connecting plate with the groove of the lower slider connecting plate for installation. S13. Adjust the horizontal position of the upper and lower sliders so that the four round steel rods fit tightly against the steel pipe to be cut, and use supporting steel bars to fix the adjacent upper slider connecting plate and the adjacent lower slider connecting plate. S14. Install the vertical connecting rod, connecting rod connecting plate, horizontal connecting rod and axial positioning sleeve in sequence, so that the axial positioning sleeve is coaxial with the steel pipe to be cut.

[0014] The beneficial effects of this invention are as follows: The device uses a simple four-circle steel fixing mechanism to securely place the steel pipe to be cut on a steel pipe support frame. This fixing mechanism ensures that the axial positioning sleeve is coaxially aligned with the steel pipe regardless of its size. The positional relationship between the main and secondary pipes is simulated through an angle adjustment mechanism and a projection drawing mechanism. The angle adjustment mechanism can extend and retract in two directions to accommodate different steel pipe sizes and intersection positions. Rotating the drawing mechanism yields the outline of the main pipe's edge on the secondary pipe. Connecting these outlines completes the drawing of the intersection line. The structure is clear, and the drawing position is accurate. This invention is suitable for steel pipes of different sizes used in bridge construction, has a wide range of applications, is easy to manufacture, uses low-cost materials, and is recyclable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the steel pipe fixing mechanism; Figure 3 This is a schematic diagram of the angle adjustment mechanism; Figure 4 This is a schematic diagram of the line drawing mechanism; In the diagram: 1-Steel pipe to be cut; 2-Steel pipe support frame; 20-I-beam; 21-Channel steel slide rail; 3-Steel pipe fixing mechanism; 300-Lower slider; 301-Lower slider connecting plate; 302-Upper slider; 303-Upper slider connecting plate; 304-Round steel rod; 305-Supporting reinforcing bar; 310-Longitudinal extension rod; 311-Vertical connecting rod; 312-Connecting rod connecting plate; 313-Transverse connecting rod; 314-Axial positioning sleeve; 315-Angle scale; 4-Angle adjustment mechanism; 40-Connecting rod; 41-Threaded rod; 42-L-shaped connecting rod; 43-Rotating spindle seat; 44-Nut; 45-Positioning pin; 46-Angle pointing plate; 5-Marking mechanism; 50-Sleeve; 51-Fixed end rod; 52-Positioning bolt; 53-Laser pen; The following will describe in detail, with reference to the accompanying drawings, embodiments of the present invention. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments: like Figures 1-4 As shown, an intersection line projection drawing device includes: two steel pipe support frames 2, a steel pipe fixing mechanism 3, an angle adjustment mechanism 4, and a drawing mechanism 5; the steel pipe support frame 2 is equipped with the steel pipe fixing mechanism 3, the steel pipe 1 to be cut is supported on the outside of the steel pipe fixing mechanism 3, the end of the steel pipe fixing mechanism 3 is fixedly installed with the angle adjustment mechanism 4, the main axis direction of the angle adjustment mechanism 4 is consistent with the direction of the intersection main pipe, and the two ends of the angle adjustment mechanism 4 are respectively connected to the drawing mechanism 5.

[0017] The steel pipe support frame 2 includes two vertically arranged I-beams 20 and one horizontally arranged channel steel slide rail 21. The tops of the two I-beams 20 are welded to the outer web of the channel steel slide rail 21, and the web height of the I-beams 20 is less than the web height of the channel steel slide rail 21. The axes of the I-beams 20 and the channel steel slide rail 21 are kept as perpendicular as possible. The steel pipe support frame 2 is used to house the steel pipe fixing mechanism 3, thus supporting the steel pipe 1 to be cut.

[0018] The steel pipe fixing mechanism 3 includes four lower sliders 300, four lower slider connecting plates 301, four upper sliders 302, four upper slider connecting plates 303, four parallel round steel rods 304, and supporting steel bars 305. The width of each lower slider 300 is slightly smaller than the width of the channel steel slide rail 21. The lower sliders 300 are respectively locked in pairs in the front and rear channels steel slide rails 21. The upper ends of each lower slider 300 are fixedly connected to the lower slider connecting plates 301. The sides of both the upper slider connecting plates 303 and the lower slider connecting plates 301 are... Several pin holes are provided and connected by pins. The upper slider connecting plate 303 is fixedly connected to the lower end of the upper slider 302. The two ends of the two round steel rods 304 are respectively connected to the upper inner side of the upper slider connecting plate 303, and the two ends of the other two round steel rods 304 are respectively connected to the lower inner side of the lower slider connecting plate 301. The cylindrical surface of the round steel rods 304 is in close contact with the inner cylindrical surface of the steel pipe 1 to be cut. The upper slider connecting plate 303 and the lower slider connecting plate 301 are fixed in relative position by supporting steel bars 305. The horizontal spacing of the round steel rods 304 is adjusted by the lower slider 300 sliding freely within the front and rear channel steel slide rails 21. The vertical spacing of the round steel rods 304 is adjusted by changing the pin connection position of the upper slider connecting plate 303 and the lower slider connecting plate 301 to meet the requirements of supporting steel pipes 1 of different diameters to be cut.

[0019] The steel pipe fixing mechanism 3 further includes: four longitudinal extension rods 310, eight vertical connecting rods 311, and two connecting rod connecting plates 312. Two of the longitudinal extension rods 310 are fixedly connected to the upper outer side of the upper slider connecting plate 303, and the other two longitudinal extension rods 310 are fixedly connected to the lower outer side of the lower slider connecting plate 301. Each longitudinal extension rod 310 has a connecting rod through hole at its middle and outer ends and is rotatably connected to a vertical connecting rod 311. The four corners of the connecting rod connecting plate 312 have connecting rod through holes and are rotatably connected to the other end of the vertical connecting rod 311. The spacing between the upper and lower connecting rod through holes of the connecting plate 312 is the same as the spacing between the connecting rod through holes on the longitudinal extension rods 310. During the positional changes of the lower slider 300 and the upper slider 302, the connecting rod connecting plate 312 is always located at the mid-plane of the line connecting the lower slider 300 and the upper slider 302, so that the connecting rod connecting plate 312 only moves horizontally in the axial direction of the steel pipe 1 to be cut.

[0020] The steel pipe fixing mechanism 3 further includes: four transverse connecting rods 313 and an axial positioning sleeve 314. The connecting rod connecting plate 312 has two openings on its inner center and is rotatably connected to the transverse connecting rods 313. The axial positioning sleeve 314 has two openings on each side and is rotatably connected to the transverse connecting rods 313. The spacing between the through holes in the connecting lugs of the connecting rod connecting plate 312 is equal to the spacing between the through holes in the connecting plate on the same side of the axial positioning sleeve 314. An angle scale 315 is provided at the end of the axial positioning sleeve 314. With the above mechanism in place, even if the four round steel rods 304 change position, the axial positioning sleeve 314 will still be coaxially aligned with the steel pipe 1 to be cut.

[0021] The angle adjustment mechanism 4 includes: a connecting rod 40, a threaded rod 41, an L-shaped connecting rod 42, and a rotating spindle seat 43. The connecting rod 40 is fixedly connected to the axial positioning sleeve 314 by a nut 44. Both ends of the connecting rod 40 are screwed to the threaded rod 41, and the other end of the threaded rod 41 is screwed to the L-shaped connecting rod 42. The L-shaped connecting rod 42 is fixedly connected to the rotating spindle seat 43 by a positioning pin 45. An angle guide plate 46 is provided in the middle of the connecting rod 40. The angle adjustment mechanism 4 is adjusted according to the angle guide plate 46 pointing to the scale of the angle scale 315. The scale of the angle scale 315 is evenly set from 0° to 180° in a clockwise direction. When the angle adjustment mechanism 4 is perpendicular to the steel pipe 1 to be cut, the scale reading of the angle scale 315 is 90°. After adjusting the displayed angle to the designed steel pipe intersection angle, the nut 44 is tightened to fix the angle adjustment mechanism 4 and the steel pipe fixing mechanism 3.

[0022] The drawing mechanism 5 includes: a sleeve 50, a fixed end rod 51, a positioning bolt 52, and a laser pointer 53. The sleeve 50 is rotatably connected to the rotating spindle seat 43. The sleeve 50 is fitted over the fixed end rod 51 and fixedly connected by the positioning bolt 52. The laser pointer 53 passes through the end of the fixed end rod 51. By adjusting the spatial position of the fixed end rod 51 within the sleeve 50, so that the distance from the tip of the laser pointer 53 to the center of the end of the sleeve 50 is the same as the radius of the main pipe, the drawing mechanism 5 can be rotated around the rotating spindle seat 43 for one revolution, thereby drawing a closed intersection line on the surface of the steel pipe 1 to be cut.

[0023] like Figures 1-4 As shown, a method for drawing intersection lines by projection includes the following steps: S1. Install the steel pipe support frame 2 and the steel pipe fixing mechanism 3 to support the steel pipe 1 to be cut; S2. Install the angle adjustment mechanism 4, fix the connecting rod 40 to the axial positioning sleeve 314, and adjust the angle of the angle pointing plate 46 to the angle scale 315 to be consistent with the designed intersection angle. S3. Adjust the lateral length of the angle adjustment mechanism 4 so that the lateral length of the angle adjustment mechanism 4 is adapted to the diameter of the steel pipe 1 to be cut, so that the drawing mechanism 5 can rotate freely around the rotating main shaft seat 43 and leave a certain distance from the outer surface of the steel pipe 1 to be cut. S4. Adjust the length of the drawing mechanism 5 so that the length of the drawing mechanism 5 is consistent with the radius of the intersecting steel pipe, and fix the positioning bolt 52. S5. Rotate the drawing mechanisms 5 at both ends to the same angle and avoid the steel pipe 1 to be cut, turn on the laser pen 53, and adjust the longitudinal length of the angle adjustment mechanism 4 so that the two lasers overlap. S6. The animation line mechanism 5 uses a laser pointer 53 to draw a closed intersection line on the steel pipe 1 to be cut.

[0024] S1 specifically includes: S11. Erect the steel pipe support frame 2 and weld and fix the I-beam 20 to the channel steel slide rail 21. S12. Place the steel pipe to be cut 1 around the round steel rod 304, place the lower slider 300 inside the channel steel slide rail 21, and align the upper slider connecting plate 303 with the groove of the lower slider connecting plate 301. S13. Adjust the horizontal position of the upper slider 302 and the lower slider 300 so that the four round steel rods 304 are tightly attached to the steel pipe 1 to be cut, and use the supporting steel bars 305 to fix the adjacent upper slider connecting plate 303 and the adjacent lower slider connecting plate 301. S14. Install the vertical connecting rod 311, connecting rod connecting plate 312, horizontal connecting rod 313 and axial positioning sleeve 314 in sequence, so that the axial positioning sleeve 314 and the steel pipe 1 to be cut are kept on the same axis.

[0025] The present invention has been described above by way of example. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present invention, or direct application to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A device for projecting and drawing intersection lines, characterized in that, include: Two steel pipe support frames (2), a steel pipe fixing mechanism (3), an angle adjustment mechanism (4), and a marking mechanism (5); the steel pipe support frame (2) is equipped with the steel pipe fixing mechanism (3), the steel pipe (1) to be cut is supported on the outside of the steel pipe fixing mechanism (3), the end of the steel pipe fixing mechanism (3) is fixedly installed with the angle adjustment mechanism (4), the main axis direction of the angle adjustment mechanism (4) is consistent with the direction of the intersecting main pipe, and the two ends of the angle adjustment mechanism (4) are respectively connected to the marking mechanism (5); The steel pipe fixing mechanism (3) includes four lower sliders (300), four lower slider connecting plates (301), four upper sliders (302), four upper slider connecting plates (303), four parallel round steel rods (304), and supporting steel bars (305). The upper ends of the lower sliders (300) are all fixedly connected to the lower slider connecting plates (301). The upper slider connecting plates (302) and the lower slider connecting plates (303) are provided with several pin holes on their sides and connected by pin shafts. The upper slider connecting plates (302) and (303) are all fixedly connected to the lower slider connecting plates (301). 03) Both are fixedly connected to the lower end of the upper slider (302), and the two ends of the two round steel rods (304) are respectively connected to the upper inner side of the upper slider connecting plate (303). The two ends of the other two round steel rods (304) are respectively connected to the lower inner side of the lower slider connecting plate (301). The cylindrical surface of the round steel rod (304) is tightly fitted with the inner cylindrical surface of the steel pipe (1) to be cut. The upper slider connecting plate (303) and the lower slider connecting plate (301) are fixed in relative position by the supporting steel bar (305). The steel pipe fixing mechanism (3) further includes: four longitudinal extension rods (310), eight vertical connecting rods (311), and two connecting rod connecting plates (312). Two of the longitudinal extension rods (310) are fixedly connected to the upper outer end of the upper sliding block connecting plate (303), and the other two longitudinal extension rods (310) are fixedly connected to the lower outer end of the lower sliding block connecting plate (301). Each longitudinal extension rod (310) has a connecting rod through hole in the middle and at the outer end, and is rotatably connected to a vertical connecting rod (311). The connecting rod connecting plate (312) has connecting rod through holes at its four corners and is rotatably connected to the other end of the vertical connecting rod (311). The spacing between the upper connecting rod through holes, the spacing between the lower connecting rod through holes, and the spacing between the connecting rod through holes on the longitudinal extension rods (310) are of equal length. The steel pipe fixing mechanism (3) further includes: four transverse connecting rods (313) and an axial positioning sleeve (314). The inner side of the connecting rod connecting plate (312) is provided with two opening connecting lugs and is rotatably connected to the transverse connecting rods (313). The axial positioning sleeve (314) is provided with two opening connecting plates on both sides and is rotatably connected to the transverse connecting rods (313). The spacing between the through holes of the connecting lugs of the connecting rod connecting plate (312) is the same as the spacing between the through holes of the connecting plate on the same side of the axial positioning sleeve (314). An angle scale (315) is provided at the end of the axial positioning sleeve (314). The angle adjustment mechanism (4) includes: a connecting rod (40), a threaded rod (41), an L-shaped connecting rod (42), and a rotating spindle seat (43). The connecting rod (40) is fixedly connected to the axial positioning sleeve (314) by a nut (44). Both ends of the connecting rod (40) are screwed to the threaded rod (41), and the other end of the threaded rod (41) is screwed to the L-shaped connecting rod (42). The L-shaped connecting rod (42) is fixedly connected to the rotating spindle seat (43) by a positioning pin (45). An angle pointing plate (46) is provided in the middle of the connecting rod (40). The line drawing mechanism (5) includes: a sleeve (50), a fixed end rod (51), a positioning bolt (52), and a laser pen (53). The sleeve (50) is rotatably connected to the rotating spindle seat (43). The sleeve (50) is sleeved on the outside of the fixed end rod (51) and fixedly connected by the positioning bolt (52). The laser pen (53) is inserted through the end of the fixed end rod (51).

2. The intersection line projection drawing device according to claim 1, characterized in that, The steel pipe support frame (2) includes two vertically arranged I-beams (20) and one horizontally arranged channel steel slide rail (21). The top ends of the two I-beams (20) are welded to the outside of the web of the channel steel slide rail (21). The web height of the I-beams (20) is less than the web height of the channel steel slide rail (21).

3. The intersection line projection drawing device according to claim 2, characterized in that, The width of the lower slider (300) is slightly smaller than the width of the channel steel slide rail (21), and the two lower sliders (300) are respectively locked in the front and rear channels steel slide rails (21).

4. A method for drawing intersection line projections, characterized in that, The steps of using the intersection line projection drawing device as described in claim 3 are as follows: S1. Install the steel pipe support frame (2) and the steel pipe fixing mechanism (3) to support the steel pipe to be cut (1); S2. Install the angle adjustment mechanism (4), fix the connecting rod (40) to the axial positioning sleeve (314), and adjust the angle of the angle pointing plate (46) to the angle scale (315) to be consistent with the designed intersection angle; S3. Adjust the lateral length of the angle adjustment mechanism (4) so ​​that the lateral length of the angle adjustment mechanism (4) is adapted to the diameter of the steel pipe (1) to be cut; S4. Adjust the length of the drawing mechanism (5) so that the length of the drawing mechanism (5) is consistent with the radius of the intersecting steel pipe, and fix the positioning bolt (52). S5. Rotate the drawing mechanism (5) at both ends to the same angle and avoid the steel pipe (1) to be cut, turn on the laser pen (53), and adjust the longitudinal length of the angle adjustment mechanism (4) so ​​that the two lasers overlap. S6. The turning line mechanism (5) draws a closed intersection line on the steel pipe (1) to be cut using a laser pointer (53).

5. The method for drawing intersection line projections according to claim 4, characterized in that, S1 specifically includes: S11. Erect the steel pipe support frame (2) and weld and fix the I-beam (20) to the channel steel slide rail (21); S12. Place the steel pipe (1) to be cut on the outside of the round steel rod (304), place the lower slider (300) inside the channel steel slide rail (21), and align the upper slider connecting plate (303) with the groove of the lower slider connecting plate (301) for installation. S13. Adjust the horizontal position of the upper slider (302) and the lower slider (300) so that the four round steel rods (304) are in close contact with the steel pipe (1) to be cut, and use the supporting steel bars (305) to fix the adjacent upper slider connecting plate (303) and the adjacent lower slider connecting plate (301). S14. Install the vertical connecting rod (311), connecting rod connecting plate (312), horizontal connecting rod (313) and axial positioning sleeve (314) in sequence, so that the axial positioning sleeve (314) and the steel pipe (1) to be cut are kept on the same axis.

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