A telescopic expanding roll device and method for high precision pipe forming

Abstract

The application discloses a telescopic rolling device for high-precision pipeline forming and belongs to the technical field of pipeline forming. The telescopic rolling device comprises a center spindle and a power push rod installed in the middle part of the center spindle. The power push rod is connected with the telescopic end of a hydraulic device outside. One end of the power push rod extending into the center spindle is fixed with an extrusion block. A guide block is arranged on the side of the connecting groove and fixed on the support piece on the side of the telescopic plate close to the middle part of the center spindle. The support piece is connected with a gas conveying hose and a negative pressure resistance increasing component. The telescopic rolling device for high-precision pipeline forming and the method thereof are characterized in that the telescopic rolling device is provided with telescopic telescopic plates to adapt to the support of pipelines with different inner diameters. After the support of the pipeline, the stability of the telescopic plate and the inner wall of the pipeline is improved by the negative pressure effect. The friction between the telescopic plate and the inner wall of the pipeline is further improved by the contact between the rough surface and the inner wall of the pipeline.

Description

Technical Field

[0001] This invention relates to the field of pipe forming technology, specifically to a retractable expansion coiling device and method for high-precision pipe forming. Background Technology

[0002] In the steel pipe forming process, the billet (steel plate or strip) is usually bent into a tube shape, and then the gap is welded together to form a steel pipe. In the traditional process, the steel pipe forming relies on a pneumatic system and a welded expansion and contraction structure, which results in poor overall adjustability and can only adapt to pipes with a single inner diameter. Therefore, in order to improve the overall adaptability, corresponding telescopic expansion and contraction devices are mostly used.

[0003] For example, an unwinding machine expander with announcement number CN115724265B includes a central rotating shaft, an expander base installed on the outside of the central rotating shaft, and a number of expander blocks symmetrically arranged relative to its center slidably installed on the expander base through an inclined guide mechanism. An arc-shaped expander plate is installed on the outward side of each expander block, a synchronous drive mechanism is provided between the expander blocks, and an axial positioning mechanism is provided between the expander plate and the expander base.

[0004] The existing technology has the following technical problems: When the existing expansion and contraction device is used, it adapts to pipes with different inner diameters by means of multiple telescopic and adjustable expansion and contraction plates. However, the surface of the expansion and contraction plates is smooth. After supporting the inner wall of the pipe, the plates are prone to relative sliding during subsequent pipe processing due to the low friction between them. In order to improve the contact friction, some expansion and contraction plates have a rough surface or multiple anti-slip protrusions. Although this method can improve the friction between them, when the pipe is tightened, the rough surface, especially the anti-slip protrusions, will cause a certain degree of wear to the inner wall of the pipe.

[0005] Therefore, we propose a retractable expansion coiling device and method for high-precision pipe forming to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide a retractable expansion coiling device and method for high-precision pipe forming, to solve the problem mentioned in the background art. Currently available expansion coiling devices on the market use multiple retractable and adjustable expansion plates to adapt to pipes of different inner diameters. However, the expansion plates have smooth surfaces, and after supporting the inner wall of the pipe, they are prone to relative sliding during subsequent pipe processing due to low friction between the expansion plates and the inner wall of the pipe. Some expansion plates have roughened surfaces or multiple anti-slip protrusions to increase contact friction. While this method can increase friction, the rough surface, especially the anti-slip protrusions, can cause a certain degree of wear to the inner wall of the pipe when it is tightened.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A telescopic expansion and contraction device for high-precision pipe forming includes a central spindle and a power push rod installed in the middle of the central spindle. The power push rod is connected to the telescopic end of an external hydraulic device. One end of the power push rod extending into the central spindle is fixed with a pressing block, and a connecting groove is provided in the middle of the pressing block. A guide block is provided on the side of the connecting groove, and the guide block is fixed on a support member in the middle of the side of the expansion and contraction plate near the central spindle. The support member is connected to a negative pressure resistance increasing component through an air supply hose, and the negative pressure resistance increasing component is installed on the expansion and contraction plate. The negative pressure resistance increasing component is used to increase the contact friction and adsorption force between the expansion and contraction plate and the inner wall of the steel pipe, and to prevent relative sliding between the steel pipe and the expansion and contraction plate.

[0009] Preferably, the extrusion block can slide inside the central spindle, and the inclined surface of the connecting groove on the extrusion block is in contact with the inclined surface of the guide block.

[0010] By adopting the above technical solution, the guide block can be squeezed by the inclined side through the movement of the extrusion block, so that the guide block can drive the support to move on the central main shaft, thereby realizing the expansion and contraction adjustment of the expansion and contraction plate.

[0011] Preferably, multiple support members are evenly distributed on the side of the expansion and contraction plate near the central main shaft, and the support members located on the left and right sides of the expansion and contraction plate are connected to the central main shaft through auxiliary springs, and the support members can slide on the central main shaft.

[0012] By adopting the above technical solution, after the extrusion component is reset, the expansion and contraction plate and the support component can be reset under the action of the auxiliary spring.

[0013] Preferably, the support includes a lifting rod, the upper end of which is inserted into the interior of the support frame. The lifting rod is connected to the support frame via a built-in spring, and the stiffness coefficient of the built-in spring is greater than that of the auxiliary spring.

[0014] By adopting the above technical solution, the stiffness coefficient of the built-in spring is greater than that of the auxiliary spring, so that the auxiliary spring can undergo elastic deformation first when compressed.

[0015] Preferably, the upper end of the lifting rod at the middle position between the expansion and contraction plate and the central spindle is wrapped with a sealing ring, while the upper end of the lifting rod at other positions is not provided with a sealing ring. The lifting rod wrapped with the sealing ring and the interior of the support frame form a receiving cavity, which is connected to each other through an air supply hose and a negative pressure resistance increasing component.

[0016] By adopting the above technical solution and setting the sealing ring, the sealing performance between the lifting rod and the support frame can be improved when the lifting rod moves, thereby squeezing the airflow inside the accommodating cavity through the air delivery hose into the interior of the negative pressure resistance increasing component.

[0017] Preferably, the negative pressure resistance increasing component includes a limiting post fixed on the expansion and contraction plate, and an adjusting rod is connected inside the limiting post through a return spring. The locking block at the end of the adjusting rod is inserted into the drive groove inside the transmission rod, and a linkage gear is keyed to the transmission rod. A guide tooth plate is provided on the side of the linkage gear, and a positioning pin fixed on the expansion and contraction plate is inserted into the upper end of the guide tooth plate. The left and right ends of the guide tooth plate are respectively inserted into the first stabilizing block and the second stabilizing block, and the first stabilizing block and the second stabilizing block are fixed on the expansion and contraction plate.

[0018] By adopting the above technical solution, the positioning pin can provide support for the rotation of the guide plate.

[0019] Preferably, the end of the adjusting rod is wrapped with a sealing ring, and the adjusting rod can slide on the limiting post. The locking block at the end of the adjusting rod is inserted into the spiral drive groove, and the transmission rod can rotate on the limiting post.

[0020] By adopting the above technical solution, the movement of the adjusting rod can make the locking block move synchronously in the drive groove, thereby making the transmission rod rotate on the limiting post.

[0021] Preferably, the linkage gear and the guide tooth plate are meshed, and the longitudinal section of the guide tooth plate is set to be arc-shaped, and the guide tooth plate, the first stabilizing block and the second stabilizing block share a common center.

[0022] By adopting the above technical solution, the rotation of the linkage gear enables the guide tooth plate to move inside the first and second stabilizing blocks.

[0023] Preferably, the end of the guide tooth plate inserted into the first stabilizing block is circumferentially wrapped with a sealing ring, and the surface of the end of the guide tooth plate inserted into the second stabilizing block is provided with anti-slip texture. Both the first and second stabilizing blocks are open on the side facing the inner wall of the steel pipe.

[0024] By adopting the above technical solution, when the guide tooth plate rotates, a negative pressure is formed at the opening of the first stabilizing block, and the end with the anti-slip texture contacts the inner wall of the pipe.

[0025] Another technical solution provided in this embodiment is a method for using a retractable expansion coiling device for high-precision pipe forming, including the following steps:

[0026] Step 1: When performing high-precision pipe forming, the pipe is fitted onto the outside of multiple expansion and contraction plates. Then, external hydraulic equipment is used to control the movement of the power push rod. After the power push rod moves, the extrusion block moves synchronously. After the extrusion block moves, the inclined side of the connecting groove can squeeze and push the guide block, so that the guide block, support and expansion and contraction plates move synchronously, thereby tightening and supporting the inner wall of the pipe.

[0027] Step 2: After the expansion and contraction plate tightens and positions itself against the inner wall of the pipe, continue to push the extrusion block to move. As the extrusion block continues to move, the lifting rod can move inside the support frame. After the lifting rod moves, it can squeeze the airflow inside the accommodating cavity through the air delivery hose into the interior of the limiting column. After the limiting column is inflated, it can push the adjusting rod to move. After the adjusting rod moves, it can make the snap-fit ​​block move in the spiral drive groove, thereby causing the transmission rod to drive the linkage gear to rotate. After the linkage gear rotates, it causes the meshing guide tooth plate to rotate around the positioning pin shaft. The end of the guide tooth plate inside the first stabilizing block moves towards the direction close to the central main shaft, while the end inside the second stabilizing block moves away from the central main shaft. At this time, after the guide tooth plate rotates, it can generate negative pressure at the opening of the first stabilizing block to attract the inner wall of the pipe, while the anti-slip end of the guide tooth plate inside the second stabilizing block contacts the inner wall of the pipe, increasing the friction with the inner wall of the pipe.

[0028] Step 3: After the pipe forming is completed, the extrusion block is reset by controlling the hydraulic equipment, so that the expansion and contraction plate is also reset, thereby separating from the inner wall of the pipe and releasing the tension on the pipe.

[0029] Step 4: After releasing the tension limit on the pipeline, the processed pipeline is lifted and stacked using a crane.

[0030] Compared with the prior art, the beneficial effects of the present invention are: the retractable expansion and contraction device and method for high-precision pipe forming can adapt to pipe support with different inner diameters by setting retractable expansion and contraction plates. At the same time, after supporting the pipe, the negative pressure effect is used to improve the stability between the expansion and contraction plates and the inner wall of the pipe. Furthermore, the contact between the rough surface and the inner wall of the pipe can further improve the friction between the expansion and contraction plates and the inner wall of the pipe.

[0031] 1. Equipped with expansion and contraction plates, the guide block can be pushed by the inclined side of the connecting groove after the extrusion block moves, so that the guide block, support and expansion and contraction plates move synchronously, thereby tightening and supporting the inner wall of the pipe, thus adapting to the forming and processing of pipes with different inner diameters.

[0032] 2. A guide toothed plate is provided. Since the guide toothed plate, the first stabilizing block, and the second stabilizing block are concentric, when the guide toothed plate rotates, one end of it can generate negative pressure at the opening of the first stabilizing block to attract the inner wall of the pipe. Meanwhile, the anti-slip end of the guide toothed plate inside the second stabilizing block contacts the inner wall of the pipe, increasing the friction with the inner wall of the pipe. This further improves the stability of the pipe when it is tightened and prevents relative sliding between the expansion and contraction plate and the inner wall of the pipe. Attached Figure Description

[0033] Figure 1 This is a frontal perspective view of the present invention;

[0034] Figure 2 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0035] Figure 3 This is a schematic diagram of the central spindle and extrusion block structure of the present invention;

[0036] Figure 4 This is a schematic diagram of the guide block and support structure of the present invention;

[0037] Figure 5 This is a cross-sectional view of the lifting rod and support frame of the present invention;

[0038] Figure 6 This is a schematic diagram of the adjusting rod and transmission rod structure of the present invention;

[0039] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle;

[0040] Figure 8 This is a schematic diagram of the linkage gear and guide gear plate structure of the present invention;

[0041] Figure 9 This is a schematic diagram of the guide tooth plate and positioning pin structure of the present invention.

[0042] In the diagram: 1. Central spindle; 2. Power push rod; 3. Extrusion block; 4. Connecting groove; 5. Guide block; 6. Support component; 601. Lifting rod; 602. Support frame; 603. Built-in spring; 7. Expansion / contraction plate; 8. Auxiliary spring; 9. Gas supply hose; 10. Negative pressure resistance increasing component; 101. Limiting post; 102. Adjusting rod; 103. Reset spring; 104. Snap-fit ​​block; 105. Transmission rod; 106. Drive groove; 107. Linkage gear; 108. Guide tooth plate; 109. Positioning pin; 110. First stabilizing block; 111. Second stabilizing block; 11. Receiving cavity. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1: Please refer to Figures 1-9 This embodiment discloses the following technical content: a retractable expansion and coiling device for high-precision pipe forming, including a central spindle 1 and a power push rod 2 installed in the middle of the central spindle 1. The power push rod 2 is connected to the telescopic end of an external hydraulic device. One end of the power push rod 2 that extends into the central spindle 1 is fixed with a pressing block 3, and a connecting groove 4 is provided in the middle of the pressing block 3. A guide block 5 is provided on the side of the connecting groove 4, and the guide block 5 is fixed on a support member 6 in the middle of the side of the expansion and contraction plate 7 near the central spindle 1. The support member 6 is connected to the support member 6 through an air supply hose 9 and a negative pressure resistance increasing component 10. Furthermore, the negative pressure resistance increasing component 10 is installed on the expansion and contraction plate 7. The negative pressure resistance increasing component 10 is used to increase the contact friction and adsorption force between the expansion and contraction plate 7 and the inner wall of the steel pipe, and to prevent relative sliding between the steel pipe and the expansion and contraction plate 7. The extrusion block 3 can slide inside the central spindle 1, and the inclined surface of the connecting groove 4 on the extrusion block 3 is in contact with the inclined surface of the guide block 5. Multiple support members 6 are evenly distributed on the side of the expansion and contraction plate 7 near the central spindle 1, and the support members 6 located on the left and right sides of the expansion and contraction plate 7 are connected to the central spindle 1 through the auxiliary spring 8. The support members 6 can slide on the central spindle 1.

[0045] During high-precision pipe forming, the pipe is fitted onto the outside of multiple expansion and contraction plates 7. Then, the power push rod 2 is moved by external hydraulic equipment. After the power push rod 2 moves, the extrusion block 3 moves synchronously. After the extrusion block 3 moves, it can use the inclined side of the connecting groove 4 to squeeze and push the guide block 5, so that the guide block 5, the support 6, and the expansion and contraction plates 7 move synchronously, thereby tightening and supporting the inner wall of the pipe. After the pipe forming is completed, the extrusion block 3 is reset by hydraulic equipment, so that the expansion and contraction plates 7 also reset, thereby separating from the inner wall of the pipe and releasing the tension on the pipe. After the tension limit on the pipe is released, the processed pipe is lifted and stacked by a crane.

[0046] Example 2: The technical content disclosed in this example is a further improvement based on Example 1. Existing expansion coiling devices use multiple adjustable expansion plates to adapt to pipes with different inner diameters. However, the expansion plates have smooth surfaces. After supporting the inner wall of the pipe, during subsequent pipe processing, the relatively low friction between the expansion plates and the inner wall can easily lead to relative sliding. To increase contact friction, some expansion plates have rough surfaces or multiple anti-slip protrusions. While this increases friction, the rough surface, especially the anti-slip protrusions, can cause wear to the inner wall of the pipe during expansion. To solve this technical problem, such as... Figures 2-9This embodiment discloses the following technical content: the support member 6 includes a lifting rod 601, and the upper end of the lifting rod 601 is inserted into the support frame 602. The lifting rod 601 is connected to the support frame 602 through a built-in spring 603, and the stiffness coefficient of the built-in spring 603 is greater than that of the auxiliary spring 8. The upper end of the lifting rod 601 at the middle position between the expansion and contraction plate 7 and the central spindle 1 is wrapped with a sealing ring, while the upper end of the lifting rod 601 at other positions is not provided with a sealing ring. The lifting rod 601 wrapped with the sealing ring is connected to the support frame. The interior of 602 forms a receiving cavity 11, which is connected to the negative pressure resistance increasing component 10 via a gas supply hose 9. The negative pressure resistance increasing component 10 includes a limiting post 101 fixed on the expansion and contraction plate 7, and an adjusting rod 102 is connected inside the limiting post 101 via a return spring 103. The locking block 104 at the end of the adjusting rod 102 is inserted into the drive groove 106 inside the transmission rod 105, and a linkage gear 107 is keyed to the transmission rod 105. A guide tooth plate 108 is provided on the side of the linkage gear 107. A positioning pin 109 fixed to the expansion and contraction plate 7 is inserted into the upper end of the guide tooth plate 108. The left and right ends of the guide tooth plate 108 are respectively inserted into the first stabilizing block 110 and the second stabilizing block 111, and the first stabilizing block 110 and the second stabilizing block 111 are fixed to the expansion and contraction plate 7. The end of the adjusting rod 102 is wrapped with a sealing ring, and the adjusting rod 102 can slide on the limiting post 101. The snap-fit ​​block 104 at the end of the adjusting rod 102 is inserted into the spiral drive groove 106, and the transmission rod 105 can slide on the limiting post 101. When the gear rotates upward, the linkage gear 107 and the guide tooth plate 108 are meshed. The longitudinal section of the guide tooth plate 108 is set to be arc-shaped. The guide tooth plate 108, the first stabilizing block 110 and the second stabilizing block 111 share the same center. The end of the guide tooth plate 108 inserted into the first stabilizing block 110 is circumferentially wrapped with a sealing ring. The surface of the end of the guide tooth plate 108 inserted into the second stabilizing block 111 is provided with anti-slip texture. The side of the first stabilizing block 110 and the second stabilizing block 111 facing the inner wall of the steel pipe are both open.

[0047] After the expansion and contraction plate 7 tightens and positions itself against the inner wall of the pipe, the compression block 3 continues to move. As the compression block 3 continues to move, the lifting rod 601 can move inside the support frame 602. After the lifting rod 601 moves, it can squeeze the airflow inside the accommodating cavity 11 through the air delivery hose 9 into the limiting post 101. After the limiting post 101 is filled with air, it can push the adjusting rod 102 to move. After the adjusting rod 102 moves, it can make the locking block 104 move in the spiral drive groove 106, thereby causing the transmission rod 105 to drive the linkage gear 107 to rotate. After the linkage gear 107 rotates, the meshing guide plate 108 rotates around the positioning pin shaft 109. One end of the guide plate 108 located inside the first stabilizing block 110 moves towards the central main shaft 1, while the other end located inside the second stabilizing block 111 moves away from the central main shaft 1. At this time, after the guide plate 108 rotates, a negative pressure is generated at the opening of the first stabilizing block 110 to attract the inner wall of the pipe, while the anti-slip end of the guide plate 108 located inside the second stabilizing block 111 contacts the inner wall of the pipe, increasing the friction with the inner wall of the pipe.

[0048] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A telescopic expansion and coiling device for high-precision pipe forming, comprising a central spindle (1) and a power push rod (2) installed in the middle of the central spindle (1), the power push rod (2) being connected to the telescopic end of an external hydraulic device, wherein one end of the power push rod (2) extending into the central spindle (1) is fixed with an extrusion block (3), and a connecting groove (4) is provided in the middle of the extrusion block (3), a guide block (5) is provided on the side of the connecting groove (4), and the guide block (5) is fixed on a support member (6) in the middle of the expansion and contraction plate (7) near the central spindle (1), characterized in that: The support member (6) is connected to the air supply hose (9) and the negative pressure resistance increasing component (10), and the negative pressure resistance increasing component (10) is installed on the expansion and contraction plate (7). The negative pressure resistance increasing component (10) is used to increase the contact friction and adsorption force between the expansion and contraction plate (7) and the inner wall of the steel pipe, and to prevent relative sliding between the steel pipe and the expansion and contraction plate (7). The extrusion block (3) can slide inside the central spindle (1), and the inclined surface of the connecting groove (4) on the extrusion block (3) is in contact with the inclined surface of the guide block (5); The support member (6) includes a lifting rod (601), and the upper end of the lifting rod (601) is inserted into the interior of the support frame (602). The upper end of the lifting rod (601) at the middle position between the expansion and contraction plate (7) and the central main shaft (1) is wrapped with a sealing ring, while the upper end of the lifting rod (601) at other positions is not provided with a sealing ring. The lifting rod (601) wrapped with the sealing ring and the interior of the support frame (602) form a receiving cavity (11). The receiving cavity (11) is connected to each other through the air supply hose (9) and the negative pressure resistance increasing component (10). The negative pressure resistance increasing component (10) includes a limiting post (101) fixed on the expansion and contraction plate (7), and an adjusting rod (102) is connected inside the limiting post (101) through a reset spring (103). The snap block (104) at the end of the adjusting rod (102) is inserted into the drive groove (106) inside the transmission rod (105), and a linkage gear (107) is keyed on the transmission rod (105). A guide tooth plate (108) is provided on the side of the linkage gear (107), and a positioning pin (109) fixed on the expansion and contraction plate (7) is inserted into the upper end of the guide tooth plate (108). The left and right ends of the guide tooth plate (108) are respectively inserted into the first stabilizing block (110) and the second stabilizing block (111), and the first stabilizing block (110) and the second stabilizing block (111) are fixed on the expansion and contraction plate (7).

2. The retractable expansion coiling device for high-precision pipe forming according to claim 1, characterized in that: The support member (6) is evenly distributed on one side of the expansion and contraction plate (7) near the central main shaft (1), and the support members (6) located on the left and right sides of the expansion and contraction plate (7) are connected to the central main shaft (1) through auxiliary springs (8), and the support member (6) can slide on the central main shaft (1).

3. The retractable expansion coiling device for high-precision pipe forming according to claim 2, characterized in that: The lifting rod (601) is connected to the support frame (602) by a built-in spring (603), and the stiffness coefficient of the built-in spring (603) is greater than that of the auxiliary spring (8).

4. A retractable expansion coiling device for high-precision pipe forming according to claim 1, characterized in that: The end of the adjusting rod (102) is wrapped with a sealing ring, and the adjusting rod (102) can slide on the limiting post (101). The snap block (104) at the end of the adjusting rod (102) is inserted into the spiral drive groove (106), and the transmission rod (105) can rotate on the limiting post (101).

5. A retractable expansion coiling device for high-precision pipe forming according to claim 4, characterized in that: The linkage gear (107) and the guide tooth plate (108) are meshed, and the longitudinal section of the guide tooth plate (108) is set to be arc-shaped. The guide tooth plate (108), the first stabilizing block (110) and the second stabilizing block (111) share the same center.

6. A retractable expansion coiling device for high-precision pipe forming according to claim 5, characterized in that: The guide tooth plate (108) is circumferentially wrapped with a sealing ring at one end inserted into the first stabilizing block (110), and the guide tooth plate (108) is provided with anti-slip texture on the surface of the end inserted into the second stabilizing block (111). Both the first stabilizing block (110) and the second stabilizing block (111) are open on the side facing the inner wall of the steel pipe.

7. The method of using the retractable expansion coil device for high-precision pipe forming according to claim 6, characterized in that, Includes the following steps: S1: When performing high-precision pipe forming processing, the pipe is sleeved on the outside of multiple expansion and contraction plates (7). Then, the power push rod (2) and the extrusion block (3) are moved by external hydraulic equipment. After the extrusion block (3) moves, it can use the inclined side of the connecting groove (4) to squeeze and push the guide block (5), so that the guide block (5), the support (6) and the expansion and contraction plates (7) move synchronously, thereby tightening and supporting the inner wall of the pipe. S2: After the expansion and contraction plate (7) tightens and positions itself against the inner wall of the pipe, the lifting rod (601) moves and can squeeze the airflow inside the accommodating cavity (11) through the air delivery hose (9) into the interior of the limiting post (101). After the limiting post (101) is filled with air, it can push the adjusting rod (102) to move. Thus, under the action of the snap-fit ​​block (104) and the spiral drive groove (106), the linkage gear (107) and the guide tooth plate (108) rotate. 8) One end of the first stabilizing block (110) moves toward the direction close to the central main shaft (1), while the other end of the second stabilizing block (111) moves away from the central main shaft (1). At this time, the guide tooth plate (108) rotates so that the opening of the first stabilizing block (110) generates negative pressure to attract the inner wall of the pipe, while the anti-slip end of the guide tooth plate (108) inside the second stabilizing block (111) contacts the inner wall of the pipe, increasing the friction with the inner wall of the pipe. S3: After the pipe is formed, the extrusion block (3) is reset by controlling the hydraulic equipment, so that the expansion and contraction plate (7) is also reset, thereby separating from the inner wall of the pipe and releasing the tension on the pipe. S4: After releasing the tension limit on the pipeline, the processed pipeline is lifted and stacked using a crane.

Images