Pipe wall flatness repairing device and method

Abstract

The invention discloses a pipe wall flatness repairing device and method. The pipe wall flatness repairing device comprises a mounting disc, a supporting sliding device, a rotating rod and an ejector rod. The mounting disc is used for being placed in the pipe body; the supporting sliding device is used for being arranged on a mounting disc, and the supporting sliding device is used for supporting the mounting disc and sliding in a pipe. The rotating rod is rotationally connected with the mounting disc; the multiple ejector rods are arranged on the mounting disc in a sliding mode, the ejector rods are connected with the rotating rod through the transmission mechanism, the rotating rod is used for controlling the ejector rods to linearly slide in the radius direction of the transmission mechanism after rotating, and the ends of the ejector rods are used for making contact with the inner wall of a pipe body; the supporting sliding device comprises a supporting sleeve, a sliding rod, an elastic piece and a universal wheel. The pipe repairing device aims at solving the problem that a pipe repairing device in the prior art can only judge whether a pipe needs to be repaired or not, but cannot repair a damaged pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline repair, and particularly to a device and method for repairing the flatness of the pipe wall of a pipe material. Background Art

[0002] In industrial fields such as petroleum, chemical industry, and water supply, pipelines, as the core carriers for fluid transportation, the flatness of their pipe walls directly affects the sealing performance and structural safety. During the manufacturing, transportation, or long-term service of traditional pipe materials, local depressions, protrusions, or wavy deformations on the pipe walls are likely to occur due to factors such as external force extrusion, welding stress, or corrosion, thereby causing problems such as medium leakage, stress concentration, and accelerated corrosion. Existing repair technologies mostly rely on manual knocking and correction, mechanical rolling, or local heating and shaping, which have problems such as low efficiency, poor consistency, and excessive dependence on operation experience. Especially for large-diameter, long-distance pipelines or scenarios with high-precision requirements, manual repair is difficult to ensure uniformity and is prone to causing secondary damage to the pipe materials. In addition, conventional mechanical devices often lack real-time deformation feedback and adaptive adjustment capabilities, and cannot dynamically optimize repair parameters according to different pipe diameters, materials, and deformation characteristics, resulting in limited application ranges. With the development of industrial intelligence, there is an urgent need for a repair device that integrates high-precision detection, flexible pressure application, and intelligent control to achieve efficient repair and quality control of the flatness of the pipe wall.

[0003] The invention patent with the application number: CN202111076830.9 and the publication number: CN113514023A (hereinafter referred to as "Prior Art 1") discloses an energy-saving and environment-friendly device for efficiently detecting the flatness of a chassis, including: a mounting frame, two detection wheels for detecting the chassis are symmetrically and rotatably mounted between the two mounting frames, and a plurality of placement grooves for placing the chassis are opened on the side where the two detection wheels are close to each other; an outer detection component; an inner detection component, and the two inner detection components are symmetrically mounted inside the two placement grooves; a pushing and supporting component, and the pushing and supporting component is mounted inside the placement groove. The pushing and supporting component includes an inner cavity, a sliding tube, and a pushing rod. A plurality of the inner cavities are respectively opened at the bottoms of the plurality of placement grooves, the sliding tube is fixedly connected to the bottom of the placement groove, and the pushing rod is slidably arranged on the upper section of the sliding tube through a limiting component.

[0004] The specification of Prior Art 1 discloses an energy-saving and environment-friendly device for efficiently detecting the flatness of a chassis. When in use, the chassis is detected by rotating, and it does not require excessive time and energy to complete the transfer of the chassis. However, in actual applications, it can only judge whether the pipe material needs to be repaired and cannot repair the damaged pipe material. Summary of the Invention

[0005] The present invention provides a device and method for repairing the flatness of the pipe wall, aiming to solve the problem that the existing pipe repair device can only judge whether the pipe needs to be repaired, but cannot repair the damaged pipe.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: A device for repairing the flatness of the pipe wall includes a mounting disc, a support sliding device, a rotating rod, and a jacking rod; the mounting disc is used to be placed inside the pipe body; the support sliding device is used to be arranged on the mounting disc, and the support sliding device is used to provide support for the mounting disc and is used to slide inside the pipe; the rotating rod is rotatably connected to the mounting disc; there are several jacking rods, and several jacking rods are all slidably arranged on the mounting disc, and the jacking rods are connected to the rotating rod through a transmission mechanism. After the rotating rod rotates, it is used to control the jacking rods to perform linear sliding along the radial direction of the transmission mechanism, and the end of the jacking rod is used to contact the inner wall of the pipe body; Among them, the support sliding device includes a support sleeve, a sliding rod, an elastic member, and a universal wheel. There are several support sleeves, which are fixedly installed on the mounting disc in an array. The sliding rod is slidably installed inside the support sleeve. The elastic member is arranged between the sliding rod and the support sleeve. One end of the elastic member is connected to the bottom of the support sleeve, and the other end is connected to the end face of the sliding rod. The universal wheel is arranged at the end of the sliding rod and is used to contact the inner wall of the pipe body and perform relative sliding.

[0007] Further, the transmission mechanism includes a driving gear fixedly installed on the rotating rod and several driven gears rotatably arranged on the mounting disc. The number of driven gears corresponds to the number of jacking rods. The inner ring of the driven gear is threadedly connected to the jacking rod, and the driven gear meshes with the driving gear. The mounting disc is used to provide installation for the driven gear.

[0008] Further, a mounting seat is arranged on the mounting disc. The driven gear is used to be rotatably installed on the mounting seat, and the jacking rod is used to pass through the mounting seat and then contact the inner wall of the pipe body.

[0009] Further, an arc-shaped top plate is arranged on the jacking rod. The arc-shaped top plate is detachably connected to the jacking rod, and the end face of the arc-shaped top plate is used to contact the inner surface of the pipe body.

[0010] Further, a heating device is also arranged outside the pipe body. The heating device is used to heat the pipe body.

[0011] Further, the heating device includes a heat-resistant cylinder and a sealing cover. The pipe body is used to be installed inside the heat-resistant cylinder. The front and rear ends of the heat-resistant cylinder are open. The sealing cover is used to be hermetically installed at the front and rear ends of the heat-resistant cylinder. Air holes are arranged on the sealing cover, and the air hole on one of the sealing covers is connected to a hot steam source.

[0012] Furthermore, a cylinder is provided on the sliding rod, the cylinder is rotatably mounted on the sliding rod, and the universal wheel is hinged to the cylinder.

[0013] Furthermore, a limiting depression is provided on the rotating rod, and a limiting ring is provided on the mounting disc. The limiting ring is rotatably connected to the limiting depression.

[0014] Furthermore, a threaded hole is provided on the rotating rod, and an extension rod is threadedly mounted in the threaded hole.

[0015] A method for repairing the wall flatness of a pipe, the repair method comprising the following steps: S1: Assemble the repair device; S101: Mount the universal wheel on the sliding rod; S102: Mount the sliding rod inside the support sleeve; S103: Mount the transmission mechanism, the ejector rod and the rotating rod on the mounting disc; S2: Repair the inner wall of the pipe body; S201: Mount the entire mounting disc inside the pipe body; S202: Hold the rotating rod by hand and reverse the rotating rod so that the end of the ejector rod moves away from the inner wall of the pipe body; S203: Push the rotating rod so that the ejector rod is located at the position of the depression to be repaired; S204: Put a sleeve with the same inner diameter as the pipe body on the depression to be repaired; S205: Rotate the rotating rod, and under the action of the transmission mechanism, make the end of the ejector rod move towards the inside of the pipe body; S206: Continue to move the mounting disc, and repeat S203 - S205 to repair each depressed part of the pipe body.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention mainly includes a mounting disc, a support sliding device, a rotating rod, and a jacking rod; during actual use, the operator holds the rotating rod and reverses it, causing the ends of several jacking rods to approach each other. Then, the mounting disc is placed inside the pipe body. Next, the operator holds the rotating rod and pushes the mounting disc to the position that needs to be repaired. During this process, the universal wheels come into contact with the inner wall of the pipe body and slide relative to the inner wall of the pipe body, enabling the mounting disc to slide more smoothly inside the pipe body. At the same time, an elastic member, a sliding rod, and a support sleeve are provided, and the three cooperate with each other to adapt to pipes of different sizes. For example, when the inner diameter of the pipe is small, the sliding rod compresses the elastic member to a greater extent; when the inner diameter of the pipe is large, the elastic member is compressed to a smaller extent, and the elastic member can also support the sliding rod. When the position of the jacking rod reaches the position that needs to be repaired, the operator sleeves a sleeve with the same inner diameter as the pipe body on the sunken position that needs to be repaired. Then, the rotating rod is rotated, and the rotating rod controls several jacking rods to move towards the position on the inner wall of the pipe body that needs to be repaired through a transmission mechanism. Under the action of the jacking rod and the sleeve, the depression of the pipe body is reset. Finally, the position of the mounting disc is repeatedly moved to repair each depression on the inner wall of the pipe. Finally, the mounting disc is slid out and the sleeve is removed to complete the repair of the pipe body. The advantage of this setting is that the pipe body can be effectively and quickly repaired. Compared with manual knocking, the use of the repair device has higher efficiency and better effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of the present invention.

[0019] Figure 2 It is a side view of the present invention.

[0020] Figure 3 It is a schematic structural diagram of Embodiment 2 of the present invention.

[0021] In the figure, 101 - mounting disc, 102 - pipe body, 103 - rotating rod, 104 - jacking rod, 105 - support sleeve, 106 - sliding rod, 107 - elastic member, 108 - universal wheel, 109 - driving gear, 110 - driven gear, 111 - mounting seat, 112 - arc-shaped top plate, 113 - heat-resistant cylinder, 114 - sealing cover, 115 - air hole, 116 - cylinder, 117 - limiting depression, 118 - limiting ring, 119 - threaded hole, 120 - extension rod. Detailed implementation mode

[0022] The present invention will be further described below in conjunction with embodiments. The described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.

[0023] Please refer to Figures 1-3 As shown, this embodiment discloses a device for repairing the flatness of the pipe wall, including a mounting disc 101, a support sliding device, a rotating rod 103 and a jacking rod 104; the mounting disc 101 is used to be placed inside the pipe body 102; the support sliding device is used to be arranged on the mounting disc 101, and the support sliding device is used to provide support for the mounting disc 101 and is used to slide inside the pipe; the rotating rod 103 is rotatably connected to the mounting disc 101; there are several jacking rods 104, and several jacking rods 104 are all slidably arranged on the mounting disc 101, and the jacking rods 104 are connected to the rotating rod 103 through a transmission mechanism. After the rotating rod 103 rotates, it is used to control the jacking rods 104 to perform linear sliding along the radial direction of the transmission mechanism, and the end of the jacking rod 104 is used to contact the inner wall of the pipe body 102; Among them, the support sliding device includes a support sleeve 105, a sliding rod 106, an elastic member 107 and a universal wheel 108. There are several support sleeves 105, which are fixedly installed on the mounting disc 101 in an array. The sliding rod 106 is slidably installed inside the support sleeve 105. The elastic member 107 is arranged between the sliding rod 106 and the support sleeve 105. One end of the elastic member 107 is connected to the bottom of the support sleeve 105, and the other end is connected to the end face of the sliding rod 106. The universal wheel 108 is arranged at the end of the sliding rod 106 and is used to contact the inner wall of the pipe body 102 and perform relative sliding.

[0024] The present invention mainly includes a mounting disc 101, a support sliding device, a rotating rod 103 and a jacking rod 104; during the actual use process, the staff holds the rotating rod 103 and reverses the rotating rod 103, so that the ends of several jacking rods 104 approach each other, and then the mounting disc 101 is placed inside the pipe body 102. Then, the staff holds the rotating rod 103 and pushes the mounting disc 101 to push the mounting disc 101 into the position to be repaired. During this process, the universal wheels 108 contact the inner wall of the pipe body 102 and slide relative to the inner wall of the pipe body 102, making the mounting disc 101 slide more smoothly inside the pipe body 102. At the same time, an elastic member 107, a sliding rod 106 and a support sleeve 105 are provided, and the three cooperate with each other to adapt to pipes of different sizes. For example, when the inner diameter of the pipe is small, the sliding rod 106 compresses the elastic member 107 to a greater extent; when the inner diameter of the pipe is large, the elastic member 107 is compressed to a smaller extent, and the elastic member 107 can also support the sliding rod 106. When the position of the jacking rod 104 reaches the position to be repaired, the staff sleeves a sleeve with the same inner diameter as the pipe body 102 on the sunken position to be repaired; then rotates the rotating rod 103, and the rotating rod 103 controls several jacking rods 104 to move towards the position to be repaired on the inner wall of the pipe body 102 through a transmission mechanism; under the action of the jacking rod 104 and the sleeve, the sunken part of the pipe body 102 is reset. Finally, the position of the mounting disc 101 is repeatedly moved to repair each sunken part on the inner wall of the pipe. Finally, the mounting disc 101 is slid out and the sleeve is removed to complete the repair of the pipe body 102. The advantage of such a setting is that the pipe body 102 can be effectively and quickly repaired. Compared with manual knocking, the use of the repair device has higher efficiency and better effect.

[0025] In some embodiments, the transmission mechanism includes a driving gear 109 fixedly installed on the rotating rod 103 and several driven gears 110 rotatably arranged on the mounting disc 101. The number of the driven gears 110 corresponds to the number of the jacking rods 104. The inner ring of the driven gear 110 is threadedly connected to the jacking rod 104, and the driven gear 110 meshes with the driving gear 109. The mounting disc 101 is used to provide installation for the driven gear 110.

[0026] During the actual use process, the staff drives the rotating rod 103 to rotate. Since the driving gear 109 is fixedly connected to the rotating rod 103, the rotating rod 103 drives the driving gear 109 to rotate after rotation. Since the driving gear 109 meshes with several driven gears 110, the driving gear 109 drives the driven gears 110 to rotate after rotation, and then the jacking rod 104 moves towards the inner wall of the pipe.

[0027] In some embodiments, a mounting base 111 is provided on the mounting disc 101. The driven gear 110 is rotatably mounted on the mounting base 111, and the ejector rod 104 is used to pass through the mounting base 111 and contact the inner wall of the pipe body 102.

[0028] In the actual use process, the purpose of setting the mounting base 111 is to facilitate the installation of the driven gear 110. The ejector rod 104 passes through the mounting base 111 and moves along the diameter direction of the mounting disc 101 at the opening of the mounting base 111.

[0029] In some embodiments, an arc-shaped top plate 112 is provided on the ejector rod 104. The arc-shaped top plate 112 is detachably connected to the ejector rod 104, and the end face of the arc-shaped top plate 112 is used to contact the inner surface of the pipe body 102.

[0030] In the actual use process, the purpose of setting the arc-shaped top plate 112 is to increase the contact area between the ejector rod 104 and the inner wall of the pipe body 102. After setting the arc-shaped top plate 112, it is more convenient for the ejector rod 104 to repair the protruding part of the inner wall of the pipe body 102.

[0031] In some embodiments, a heating device is further provided outside the pipe body 102. The heating device is used to heat the pipe body 102.

[0032] In the actual use process, the purpose of setting the heating device is to soften the pipe body 102 so that the ejector rod 104 and the arc-shaped top plate 112 can better repair the inner wall of the pipe body 102.

[0033] In some embodiments, the heating device includes a heat-resistant cylinder 113 and a sealing cover 114. The pipe body 102 is installed inside the heat-resistant cylinder 113. The front and rear ends of the heat-resistant cylinder 113 are open, and the sealing cover 114 is used to be hermetically installed at the front and rear ends of the heat-resistant cylinder 113. An air hole 115 is provided on the sealing cover 114, and the air hole 115 on one of the sealing covers 114 is connected to a hot steam source.

[0034] In the actual use process, when it is necessary to heat the pipe body 102, first, the heat-resistant cylinder 113 needs to be sleeved outside the pipe body 102, then the front and rear end faces of the heat-resistant cylinder 113 are both covered with the sealing cover 114, and then the hot steam is introduced into the heat-resistant cylinder 113. The hot steam is discharged from the air hole 115. In this process, the hot steam heats the pipe body 102 to achieve the purpose of softening the pipe body 102.

[0035] In some embodiments, a cylinder 116 is provided on the sliding rod 106. The cylinder 116 is rotatably mounted on the sliding rod 106, and the universal wheel 108 is hinged on the cylinder 116.

[0036] During actual use, the purpose of setting the cylinder 116 is to facilitate the rotation and direction change of the universal wheel 108.

[0037] In some embodiments, a limiting recess 117 is provided on the rotating rod 103, and a limiting ring 118 is provided on the mounting disk 101. The limiting ring 118 is rotatably connected to the limiting recess 117.

[0038] During actual use, the purpose of setting the limiting recess 117 is to cooperate with the limiting ring 118 on the mounting disk 101 to prevent the rotating rod 103 from disengaging from the mounting disk 101.

[0039] In some embodiments, a threaded hole 119 is provided on the rotating rod 103, and an extension rod 120 is threadedly installed in the threaded hole 119.

[0040] During actual use, the purpose of setting the threaded hole 119 is to enable threaded connection between the rotating rod 103 and the extension rod 120.

[0041] This embodiment also relates to a method for repairing the flatness of the pipe wall. The repair method includes the following steps: S1: Assemble the repair device; S101: Install the universal wheel 108 on the sliding rod 106; S102: Install the sliding rod 106 inside the support sleeve 105; S103: Install the transmission mechanism, the ejector rod 104, and the rotating rod 103 on the mounting disk 101; S2: Repair the inner wall of the pipe body 102; S201: Install the entire mounting disk 101 inside the pipe body 102; S202: Hold the rotating rod 103 and reverse-rotate the rotating rod 103 so that the end of the ejector rod 104 moves away from the inner wall of the pipe body 102; S203: Push the rotating rod 103 so that the ejector rod 104 is located at the position of the depression to be repaired; S204: Put a sleeve with the same inner diameter as the pipe body 102 on the position of the depression to be repaired; S205: Rotate the rotating rod 103, and under the action of the transmission mechanism, make the end of the ejector rod 104 move towards the inside of the pipe body 102; S206: Continue to move the mounting disk 101, and repeat S203 - S205 to repair each depressed part of the pipe body 102.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0043] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0044] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swiveling connection", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. It may be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for repairing the flatness of the pipe wall, characterized in that: It includes: An installation disk (101) for being placed inside the pipe body (102); A support sliding device for being arranged on the installation disk (101), which is used to support the installation disk (101) and slide inside the pipe; A rotating rod (103) rotatably connected to the installation disk (101); There are several ejector rods (104), and several ejector rods (104) are all slidably arranged on the installation disk (101). The ejector rods (104) are connected to the rotating rod (103) through a transmission mechanism. After the rotating rod (103) rotates, it is used to control the ejector rods (104) to perform linear sliding along the radial direction of the transmission mechanism. The end of the ejector rod (104) is used to contact the inner wall of the pipe body (102); Among them, the support sliding device includes a support sleeve (105), a sliding rod (106), an elastic member (107) and a universal wheel (108). There are several support sleeves (105), which are fixedly installed on the installation disk (101) in an array. The sliding rod (106) is slidably installed inside the support sleeve (105). The elastic member (107) is arranged between the sliding rod (106) and the support sleeve (105). One end of the elastic member (107) is connected to the bottom of the support sleeve (105), and the other end is connected to the end face of the sliding rod (106). The universal wheel (108) is arranged at the end of the sliding rod (106) and is used to contact the inner wall of the pipe body (102) and perform relative sliding.

2. The pipe wall flatness repair device according to claim 1, wherein: The transmission mechanism includes a driving gear (109) fixedly installed on the rotating rod (103) and several driven gears (110) rotatably arranged on the installation disk (101). The number of driven gears (110) corresponds to the number of ejector rods (104). The inner ring of the driven gear (110) is threadedly connected to the ejector rod (104). The driven gear (110) meshes with the driving gear (109). The installation disk (101) is used to provide installation for the driven gear (110).

3. The pipe wall flatness repair device according to claim 2, characterized in that: An installation seat (111) is arranged on the installation disk (101). The driven gear (110) is rotatably installed on the installation seat (111). The ejector rod (104) is used to pass through the installation seat (111) and then contact the inner wall of the pipe body (102).

4. A pipe wall flatness repair device according to claim 2, characterized in that: An arc-shaped top plate (112) is arranged on the ejector rod (104). The arc-shaped top plate (112) is detachably connected to the ejector rod (104). The end face of the arc-shaped top plate (112) is used to contact the inner surface of the pipe body (102).

5. The pipe wall flatness repair device according to claim 1, characterized in that: A heating device is also arranged outside the pipe body (102), and the heating device is used to heat the pipe body (102).

6. The pipe wall flatness repair device according to claim 1, characterized in that: The heating device includes a heat-resistant cylinder (113) and a sealing cover (114). The pipe body (102) is used to be installed inside the heat-resistant cylinder (113). The front and rear ends of the heat-resistant cylinder (113) are open. The sealing cover (114) is used to be hermetically installed at the front and rear ends of the heat-resistant cylinder (113). An air hole (115) is provided on the sealing cover (114). The air hole (115) on one of the sealing covers (114) is connected to a heat steam source.

7. A pipe wall flatness repair device according to claim 1, characterized in that: A cylinder (116) is provided on the sliding rod (106). The cylinder (116) is rotatably installed on the sliding rod (106). The universal wheel (108) is hinged to the cylinder (116).

8. A pipe wall flatness repair device according to claim 1, characterized in that: A limiting depression (117) is provided on the rotating rod (103). A limiting ring (118) is provided on the mounting disc (101). The limiting ring (118) is rotatably connected to the limiting depression (117).

9. The pipe wall flatness repair device according to claim 1, characterized in that: A threaded hole (119) is provided on the rotating rod (103). An extension rod (120) is threadedly installed in the threaded hole (119).

10. A method for repairing the flatness of the pipe wall, including a device for repairing the flatness of the pipe wall according to any one of claims 1-9, characterized in that, The repair method includes the following steps: S1: Assemble the repair device; S101: Install the universal wheel (108) on the sliding rod (106); S102: Install the sliding rod (106) inside the support sleeve (105); S103: Install the transmission mechanism, the ejector rod (104) and the rotating rod (103) on the mounting disc (101); S2: Repair the inner wall of the pipe body (102); S201: Install the entire mounting disc (101) inside the pipe body (102); S202: Hold the rotating rod (103) by hand and reverse the rotating rod (103) so that the end of the ejector rod (104) is away from the inner wall of the pipe body (102); S203: Push the rotating rod (103) so that the ejector rod (104) is located at the position of the depression to be repaired; S204: Put a sleeve with the same inner diameter as the pipe body (102) on the position of the depression to be repaired; S205: Rotate the rotating rod (103), and under the action of the transmission mechanism, make the end of the ejector rod (104) move towards the inside of the pipe body (102); S206: Continue to move the mounting disc (101) and repeat S203 - S205 to repair each depressed part of the pipe body (102).

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