Thin-wall pipe fitting inner wall shaping device

Abstract

The invention provides a thin-wall pipe fitting inner wall shaping device, and belongs to the technical field of bent pipe manufacturing. The problems that in the existing bent pipe manufacturing process, a clamping end is sunken and even crushed and the like are solved. The thin-wall pipe fitting inner wall shaping device comprises a shaping module, a transmission module, a power module and a limiting module, the shaping module comprises a guide rail mounting piece, an outer guide rail, an inner guide rail, a first shaping block, a second shaping block and a driving device, a guide rail groove is formed in the guide rail mounting piece, and the first shaping block and the second shaping block are each provided with an elastic connecting piece; the outer guide rail is rotationally connected with a first shaping block through an elastic connecting piece, the inner guide rail is rotationally connected with a second shaping block through an elastic connecting piece, and when the driving device drives the outer guide rail and the inner guide rail to reach the farthest position, the first shaping block and the second shaping block are matched to form a shaping ring. The bent pipe shaping device has the advantages that the bent pipe clamping end can be shaped, and meanwhile it can be ensured that the inner wall of a pipe is evenly stressed during shaping.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bent pipe manufacturing, and particularly relates to a thin-walled pipe inner wall shaping device. BACKGROUND

[0002] Before bending, the front section of the metal pipe is usually clamped by a clamping die to ensure the stability of the pipe during bending. The current clamping die is usually driven by a hydraulic cylinder. In order to ensure the firmness, a very large force is applied to the outer wall of the pipe.

[0003] With the increasing use of thin-walled bent pipes, if the bending of thin-walled pipes still continues to use a too large force to ensure the firmness of the pipe, it is very likely to cause the pipe to be crushed, resulting in damage to the product. When the same pipe is bent multiple times, the clamping end is more likely to be concave or even crushed. SUMMARY

[0004] The present application aims to solve the above problems in the prior art and provides a thin-walled pipe inner wall shaping device.

[0005] The purpose of the present application can be achieved by the following technical scheme: a thin-walled pipe inner wall shaping device, comprising a shaping module, a transmission module, a power module and a limiting module, the transmission module is used to connect the power module and the shaping module, the shaping module comprises a guide rail mounting piece, an outer guide rail, an inner guide rail, a first shaping block, a second shaping block and a driving device, the guide rail mounting piece is provided with a guide rail groove for mounting the outer guide rail and the inner guide rail, the first shaping block and the second shaping block are both provided with an elastic connecting piece, the outer guide rail is rotatably connected to the first shaping block through the elastic connecting piece, the inner guide rail is rotatably connected to the second shaping block through the elastic connecting piece, the elastic connecting piece is used to drive the first shaping block and the second shaping block away from the transmission module, the driving device is used to drive the outer guide rail and the inner guide rail to move axially, the limiting module is used to limit the first shaping block and the second shaping block from leaving the guide rail mounting piece, when the driving device drives the outer guide rail and the inner guide rail to the farthest position, the first shaping block and the second shaping block cooperate to form a shaping circular ring.

[0006] The working principle of the present application is as follows: in the initial state, the first shaping blocks and the second shaping blocks are close to the transmission module, and the first shaping blocks and the second shaping blocks are arranged apart, so that the diameters of the circles formed by the plurality of first shaping blocks and the plurality of second shaping blocks are both smaller than the diameter of the shaping annular ring, so that the initial state can be moved at the pipe elbow, and it is convenient to move to the position needing shaping; when reaching the position needing shaping, the driving device drives the outer guide rail and the inner guide rail to move towards the limiting module; due to the effect of the limiting module, the elastic connecting piece is extruded, driving the first shaping blocks and the second shaping blocks to move radially, so as to expand the diameters of the circles formed by the first shaping blocks and the second shaping blocks; since the first shaping blocks and the second shaping blocks are arranged apart, the driving device first drives the inner guide rail to move, and then drives the outer guide rail to move, so that the first shaping blocks can be inserted between the second shaping blocks to form a shaping annular ring; at this time, the shaping module is moved to shape the pipe; after shaping is completed, the power module works reversely to reset the first shaping blocks and the second shaping blocks In the above-mentioned thin-walled pipe inner wall shaping device, the driving device comprises an outer guide rail driving member and an inner guide rail driving member, the outer guide rail is directly connected to the outer guide rail driving member, and a plurality of inner guide rails are connected through a connecting plate, and an extension rod connecting the inner guide rail driving member is arranged on the connecting plate.

[0007] In the above-mentioned thin-walled pipe inner wall shaping device, the inner guide rail comprises a connecting bottom plate, a connecting guide column and an elastic clamping piece, the connecting bottom plate is used for connecting the transmission module, the connecting guide column is fixedly connected to the connecting bottom plate, a first transmission guide rail is arranged on the connecting bottom plate, an inner slide rail positioning piece is arranged on the extension rod, the inner slide rail positioning piece can move along the length direction of the first transmission guide rail, and the elastic clamping piece is used for fixing the inner slide rail positioning piece at the end of the first transmission guide rail.

[0008] In the above-mentioned thin-walled pipe inner wall shaping device, the elastic clamping piece comprises a mounting arc, limiting elastic pieces arranged at both ends of the mounting arc and limiting nails arranged on the limiting elastic pieces, the inner slide rail positioning piece is provided with a mounting groove for mounting the mounting arc, and the connecting guide column is provided with a first limiting through hole and a second limiting through hole for clamping the limiting nails.

[0009] In the above-mentioned thin-walled pipe inner wall shaping device, the outer guide rail driving member comprises an outer slide rail piece, an inner connecting piece and an outer guide rail positioning piece, the outer slide rail piece is rotationally connected to the connecting bottom plate, a second transmission guide rail is arranged on the outer slide rail piece, the outer guide rail positioning piece is arranged on the inner connecting piece, and the outer guide rail positioning piece can move along the length direction of the second transmission guide rail, and the inner connecting piece is used for connecting the outer slide rail.

[0010] In the thin-walled pipe inner wall shaping device, the first transmission guide rail comprises a radial moving part and an axial moving part, the radial moving part is close to the shaping module, a fixed sliding rail is arranged on the connecting bottom plate, and screws penetrating through the fixed sliding rail are arranged on the outer sliding rail piece.

[0011] In the thin-walled pipe inner wall shaping device, the first shaping block and the second shaping block are both provided with a rotating connecting rod, the rotating connecting rod is used for rotating connection on the outer guide rail or the inner guide rail, the elastic connecting piece comprises a limiting spring, a spring shaft, an axial positioning shaft sleeve, a spring fixing piece and a connecting rod limiting piece, the spring shaft and the spring fixing piece are fixedly connected on the outer guide rail or the inner guide rail, the limiting spring is sleeved on the spring shaft, the axial positioning shaft sleeve is arranged at both ends of the limiting spring, a first insertion piece is arranged at one end of the limiting spring and inserted into the spring fixing piece, a second insertion piece is arranged at the other end of the limiting spring and inserted into the connecting rod limiting piece, and the connecting rod limiting piece is rotatingly connected on the rotating connecting rod.

[0012] In the thin-walled pipe inner wall shaping device, the transmission module comprises a motor shaft ball joint, a plurality of outer side ball socket pieces and a plurality of inner side ball joints, the motor shaft ball joint is used for the power module, the outer side ball socket piece is provided with a spherical groove for mounting the inner side ball joint and the motor shaft ball joint, the motor shaft ball joint and the inner side ball joint are both provided with a movable groove, a connecting cross rod is arranged in the movable groove, second rollers are arranged at both ends of the connecting cross rod, and a limiting guide rail for sliding of the second rollers is arranged in the spherical groove.

[0013] In the thin-walled pipe inner wall shaping device, the power module comprises a motor, a motor mounting plate and a first moving steel wire rope, the motor mounting plate is used for mounting the motor, the first moving steel wire rope is connected with the motor, and the first moving steel wire rope is used for being pulled by a person to drive the shaping module to move to a specified position.

[0014] In the thin-walled pipe inner wall shaping device, the limiting module comprises a positioning baffle and a second moving steel wire rope, the positioning baffle is mounted on the guide rail mounting piece through screws, the second moving steel wire rope is fixedly connected on the positioning baffle, the second moving steel wire rope is used for being pulled by a person to drive the shaping module to move to a specified position, and abutting bosses for abutting against the positioning baffle are arranged on the first shaping block and the second shaping block.

[0015] The beneficial effects of the present application are as follows: The present application sets a slide rail structure which does not change the axial position of the inner guide rail to the inner slide rail part, so that the inner guide rail shaping block moves radially to the maximum radial position first. By designing the inner guide rail shaping block as an inverted triangular structure and the outer guide rail shaping block as a right triangular structure, the shaping surfaces form a complete cylindrical surface when the shaping parts reach the maximum radial position, thereby ensuring that the force on the inner wall of the pipe is uniform when the entire clamping end is shaped.

[0016] The present application uses a universal transmission joint which can realize rotation in three mutually perpendicular directions, each direction can rotate 120 degrees. Since it is difficult to observe the placement of the device inside the pipe, by using multiple universal transmission joints, the required torque for work can still be transmitted through the transmission module after passing through different bending angles and bending radii of the same inner diameter pipe. Moreover, during the shaping stage, the universal transmission joint can also ensure the continuity of movement after pulling the steel wire rope.

[0017] The present application is to make the inner and outer guide rails move in turn. The rear end of the inner slide rail part is designed as a structure that does not allow the inner slide rail positioning part to move axially, but allows the inner and outer slide rail parts to rotate around the axis at different angles. By corresponding to the difference between the two rotation angles, the structure on the shaping end connecting part which is fixed with the outer slide rail part is processed as a slide rail, so that the slide rail screw can move at the same angle, thereby using one motor to control the entire device and simplifying the control of the device. BRIEF DESCRIPTION OF DRAWINGS

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

[0019] Figure 2 is a structural schematic diagram of the present application.

[0020] Figure 3 is a structural schematic diagram of the present application when the shaping module is shaping.

[0021] Figure 4 is a structural schematic diagram of the present application in the initial state of the shaping module.

[0022] Figure 5 is a structural schematic diagram of the inner guide rail of the present application.

[0023] Figure 6 is a structural schematic diagram of the inner guide rail of the present application.

[0024] Figure 7 is a structural schematic diagram of the elastic clamping part of the present application.

[0025] Figure 8 is a structural schematic diagram of the outer guide rail of the present application.

[0026] Figure 9 is a structural schematic diagram of the elastic connecting piece of the application.

[0027] Figure 10 is a structural schematic diagram of the transmission module of the application.

[0028] In the figure, 1, shaping module; 2, transmission module; 3, power module; 4, limiting module; 11, guide rail mounting piece; 12, outer guide rail; 13, inner guide rail; 14, shaping piece connecting rod; 15, driving device; 16, first shaping block; 17, second shaping block; 18, positioning baffle; 111, guide rail groove; 112, elastic connecting piece; 113, shaping ring; 121, outer side sliding rail piece; 122, inner side connecting piece; 123, positioning screw hole; 124, anti-interference through hole; 125, outer guide rail positioning piece; 126, second transmission guide rail; 131, connecting bottom plate; 132, connecting guide post; 133, elastic clamping piece; 134, first transmission guide rail; 135, inner sliding rail positioning piece; 1121, limiting spring; 1122, spring shaft; 1123, axial positioning shaft sleeve; 1124, spring fixing piece; 1125, connecting rod limiting piece; 1126, first insertion piece; 1127, second insertion piece; 1311, fixed sliding rail; 1312, screw; 1331, mounting arc; 1332, limiting elastic piece; 1333, limiting peg; 1334, mounting groove; 1321, first limiting through hole; 1322, second limiting through hole; 1341, radial movement part; 1342, axial movement part; 151, outer guide rail driving piece; 152, inner guide rail driving piece; 153, extension rod; 161, rotating connecting rod; 173, abutting boss; 31, motor shaft ball joint; 32, outer side ball socket piece; 33, inner side ball joint; 34, spherical groove; 35, movable groove; 36, connecting cross rod; 37, second roller; 38, limiting guide rail; 41, motor; 42, motor mounting plate; 43, first moving steel wire rope; 51, second moving steel wire rope. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the application and further describe the technical solutions of the application in conjunction with the drawings, but the application is not limited to these embodiments.

[0030] As Figures 1-10As shown, the thin-walled pipe inner wall shaping device includes a shaping module 1, a transmission module 2, a power module 3 and a limit module 4. The transmission module 2 is used to connect the power module 3 and the shaping module 1. The shaping module 1 includes a guide rail mounting member 11, an outer guide rail 12, an inner guide rail 13, a first shaping block 16, a second shaping block 17 and a driving device 15. The guide rail mounting member 11 is provided with a guide rail groove 111 for installing the outer guide rail 12 and the inner guide rail 13. The first shaping block 16 and the second shaping block 17 are both provided with an elastic connecting member 112. The outer guide rail 12 is rotatably connected to the first shaping block 16 through the elastic connecting member 112, and the inner guide rail 13 is connected to the first shaping block 16 through the elastic connecting member 112. The elastic connecting member 112 is rotatably connected to the second shaping block 17. The elastic connecting member 112 is used to drive the first shaping block 16 and the second shaping block 17 away from the transmission module 2. The driving device 15 is used to drive the outer guide rail 12 and the inner guide rail 13 to move axially. The limit module 4 is used to limit the first shaping block 16 and the second shaping block 17 from leaving the guide rail mounting member 11. When the driving device 15 drives the outer guide rail 12 and the inner guide rail 13 to reach the farthest point, the first shaping block 16 and the second shaping block 17 cooperate to form a shaping ring 113. The first shaping block 16 is in the shape of a regular triangle, and the second shaping block 17 is in the shape of an inverted triangle, which form a continuous cylindrical surface after being assembled.

[0031] In further detail, the driving device 15 includes an outer guide rail driving component 151 and an inner guide rail driving component 152. The outer guide rail 12 is directly connected to the outer guide rail driving component 151, and multiple inner guide rails 13 are connected by a connecting plate. An extension rod 153 connected to the inner guide rail driving component 152 is provided on the connecting plate. This setting is used to ensure that a power module 3 can drive the outer guide rail and the inner guide rail 13 to move successively.

[0032] To elaborate further, the inner guide rail 13 includes a connecting base plate 131, a connecting guide column 132 and an elastic clip 133. The connecting base plate 131 is used to connect the transmission module 2. The connecting guide column 132 is fixedly connected to the connecting base plate 131. A first transmission guide rail 134 is provided on the connecting base plate 131. An inner slide rail positioning member 135 is provided on the extension rod 153. The inner slide rail positioning member 135 can move along the length direction of the first transmission guide rail 134. The elastic clip 133 is used to fix the inner slide rail positioning member 135 at the end of the first transmission guide rail 134. The two ends of the first transmission guide rail 134 respectively correspond to the positions of the first shaping block 16 and the second shaping block 17 when they are spliced ​​into a cylindrical surface and the positions of the first shaping block 16 and the second shaping block 17 when they are initially retracted. This setting is used to ensure that the first shaping block 16 and the second shaping block 17 will not retract when they are spliced ​​into a cylindrical surface.

[0033] Further, the elastic clamping member 133 comprises a mounting arc 1331, a limiting elastic member 1332 arranged at both ends of the mounting arc 1331, and a limiting pin 1333 arranged on the limiting elastic member 1332. The inner slide rail positioning member 135 is provided with a mounting groove 1334 for mounting the mounting arc 1331. The connecting guide column 132 is provided with a first limiting through hole 1321 and a second limiting through hole 1332 for clamping the limiting pin 1333. When the inner guide rail 13 positioning member reaches the specified position, the limiting pin 1333 can be smoothly clamped into the first limiting through hole 1321 and the second limiting through hole 1332.

[0034] Further, the outer guide rail driving member 151 comprises an outer slide rail member 121, an inner connecting member 122, and an outer guide rail positioning member 125. The outer slide rail member 121 is rotationally connected to the connecting bottom plate 131. The outer slide rail member 121 is provided with a second transmission guide rail 126. The outer guide rail positioning member 125 is arranged on the inner connecting member 122 and can move along the length direction of the second transmission guide rail 126. The inner connecting member 122 is used for connecting the outer slide rail. The outer slide rail member 121 is provided with an anti-interference through hole 124 to ensure that the slide rail members of the outer guide rail 12 and the inner guide rail 13 do not interfere with each other. The outer slide rail member 121 is provided with a positioning screw 1312 hole 123.

[0035] Further, the first transmission guide rail 134 comprises a radial movement part 1341 and an axial movement part 1342. The radial movement part 1341 is close to the shaping module 1. The connecting bottom plate 131 is provided with a fixed slide rail 1311. The outer slide rail member 121 is provided with a screw 1312 passing through the fixed slide rail 1311. This arrangement is used to prevent the second shaping block 17 from moving axially after abutting against the limiting module 4, and to become a radial movement. The radial movement of the first shaping block 16 eventually forms a cylindrical surface. The change amount of the rotation angle of the fixed slide rail 1311 is the same as the rotation angle of the radial movement part 1341. Thus, the movement of the outer slide rail member 121 and the inner slide rail member can be completed by using one motor 41.

[0036] Further, the first shaping block 16 and the second shaping block 17 are both provided with a rotating connecting rod 161 for rotating connection on the outer guide rail 12 or the inner guide rail 13, the elastic connecting piece 112 includes a limiting spring 1121, a spring shaft 1122, an axial positioning shaft sleeve 1123, a spring fixing piece 1124 and a connecting rod limiting piece 1125, the spring shaft 1122 and the spring fixing piece 1124 are both fixedly connected on the outer guide rail 12 or the inner guide rail 13, the limiting spring 1121 is sleeved on the spring shaft 1122, the axial positioning shaft 1123 is sleeved on both ends of the limiting spring 1121, a first insertion piece is arranged on one end of the limiting spring 1121 and inserted into the inside of the spring fixing piece 1124, a second insertion piece 1127 is arranged on the other end of the limiting spring 1121 and inserted into the inside of the connecting rod limiting piece 1125, and the connecting rod limiting piece 1125 is rotatably connected on the rotating connecting rod 161.

[0037] Further, the transmission module 2 includes a motor 41 shaft ball joint 31, a plurality of outer side ball socket pieces 32 and a plurality of inner side ball joints 33, the motor 41 shaft ball joint 31 is used for the power module 3, the outer side ball socket piece 32 is provided with a spherical groove 34 for installing the inner side ball joint 33 and the motor 41 shaft ball joint 31, the motor 41 shaft ball joint 31 and the inner side ball joint 33 are both provided with a movable slot 35, a connecting cross rod 36 is arranged in the movable slot 35, the two ends of the connecting cross rod 36 are provided with a second roller 37, the spherical groove 34 is provided with a limiting guide rail 38 for sliding the second roller 37, the three-way 120° freedom degree makes the torque can be transmitted in a non-linear manner, and the outer side ball socket piece 32 and the inner side ball joint 33 can select the appropriate number according to the actual demand.

[0038] Further, the power module 3 includes a motor 41, a motor 41 mounting plate and a first moving steel wire rope 43, the motor 41 mounting plate is used for installing the motor 41, the first moving steel wire rope 43 is connected with the motor 41, and the first moving steel wire rope 43 is used for being pulled by a person to drive the shaping module 1 to move to a specified position, and the manually pulled moving steel wire rope dragging device moves in the pipe; the motor 41 mounting plate and the protective shell form a sealed space to block the metal chips in the bending process.

[0039] Further, the limiting module 4 includes a positioning baffle 18 and a second moving steel wire rope 51, the positioning baffle 18 is installed on the guide rail mounting piece 11 through a screw 1312, the second moving steel wire rope 51 is fixedly connected on the positioning baffle 18, the second moving steel wire rope 51 is used for being pulled by a person to drive the shaping module 1 to move to a specified position, the first shaping block 16 and the second shaping block 17 are both provided with an abutting convex platform 173 for abutting on the positioning baffle 18, and the first moving steel wire rope 43 and the second moving steel wire rope 51 are mutually matched to facilitate moving in two directions at will.

[0040] The specific embodiments described herein are merely illustrative of the principles of this application. Numerous modifications or adaptations will be readily apparent to those skilled in the art of this application without departing from the spirit or scope of the application as defined by the following claims.

[0041] Although a large number of terms are used herein, the possibility of using other terms is not excluded. The use of these terms is merely intended to facilitate the description and explanation of the essence of the present application; it is contrary to the spirit of the present application to interpret them as any kind of additional limitation.

Claims

1. A thin-walled pipe inner wall shaping device, characterized in that: The invention comprises a shaping module (1), a transmission module (2), a power module (3) and a limit module (4), wherein the transmission module (2) is used to connect the power module (3) and the shaping module (1), and the shaping module (1) comprises a guide rail mounting member (11), an outer guide rail (12), an inner guide rail (13), a first shaping block (16), a second shaping block (17) and a driving device (15), wherein the guide rail mounting member (11) is provided with a guide rail groove (111) for mounting the outer guide rail (12) and the inner guide rail (13), and the first shaping block (16) and the second shaping block (17) are both provided with an elastic connecting member (112), and the outer guide rail (12) is rotatably connected to the first shaping block (16) through the elastic connecting member (112). The inner guide rail (13) is rotatably connected to the second shaping block (17) through an elastic connecting member (112), and the elastic connecting member (112) is used to drive the first shaping block (16) and the second shaping block (17) away from the transmission module (2). The driving device (15) is used to drive the outer guide rail (12) and the inner guide rail (13) to move axially. The limiting module (4) is used to limit the first shaping block (16) and the second shaping block (17) from leaving the guide rail mounting member (11). When the driving device (15) drives the outer guide rail (12) and the inner guide rail (13) to reach the farthest point, the first shaping block (16) and the second shaping block (17) cooperate to form a shaping ring (113).

2. A thin-walled pipe inner wall shaping device according to claim 1, characterized in that: The driving device (15) comprises an outer guide rail driving member (151) and an inner guide rail driving member (152); the outer guide rail (12) is directly connected to the outer guide rail driving member (151); a plurality of inner guide rails (13) are connected via a connecting plate; an extension rod (153) connected to the inner guide rail driving member (152) is provided on the connecting plate.

3. The thin-walled pipe inner wall shaping device according to claim 2, characterized in that: The inner guide rail (13) includes a connecting base plate (131), a connecting guide column (132) and an elastic clamp (133), wherein the connecting base plate (131) is used to connect the transmission module (2), the connecting guide column (132) is fixedly connected to the connecting base plate (131), a first transmission guide rail (134) is provided on the connecting base plate (131), an inner slide rail positioning member (135) is provided on the extension rod (153), the inner slide rail positioning member (135) can move along the length direction of the first transmission guide rail (134), and the elastic clamp (133) is used to fix the inner slide rail positioning member (135) to the end of the first transmission guide rail (134).

4. A thin-walled pipe inner wall shaping device according to claim 3, characterized in that: The elastic clamping member (133) includes a mounting arc (1331), a limiting elastic member (1332) arranged at both ends of the mounting arc (1331), and a limiting pin (1333) arranged on the limiting elastic member (1332); the inner slide rail positioning member (135) is provided with a mounting groove (1334) for mounting the mounting arc (1331); and the connecting guide column (132) is provided with a first limiting through hole (1321) and a second limiting through hole (1322) for the limiting pin (1333) to be clamped.

5. The thin-walled pipe inner wall shaping device according to claim 3, characterized in that: The outer guide rail driving member (151) includes an outer slide rail member (121), an inner connecting member (122) and an outer guide rail positioning member (125), wherein the outer slide rail member (121) is rotatably connected to the connecting base plate (131), and a second transmission guide rail (126) is provided on the outer slide rail member (121), and the outer guide rail positioning member (125) is provided on the inner connecting member (122), and the outer guide rail positioning member (125) can move along the length direction of the second transmission guide rail (126), and the inner connecting member (122) is used to connect the outer slide rail.

6. The thin-walled pipe inner wall shaping device according to claim 5, characterized in that: The first transmission guide rail (134) includes a radially movable portion (1341) and an axially movable portion (1342), the radially movable portion (1341) being close to the shaping module (1), a fixed slide rail (1311) being provided on the connecting base plate (131), and a screw (1312) passing through the fixed slide rail (1311) being provided on the outer slide rail member (121).

7. The thin-walled pipe inner wall shaping device according to claim 1, characterized in that: The first shaping block (16) and the second shaping block (17) are both provided with a rotating connecting rod (161), the rotating connecting rod (161) being used for being rotatably connected to the outer guide rail (12) or the inner guide rail (13), the elastic connecting member (112) comprising a limiting spring (1121), a spring shaft (1122), an axial positioning sleeve (1123), a spring fixing member (1124) and a connecting rod limiting member (1125), the spring shaft (1122) and the spring fixing member (1124) being both fixedly connected to the outer guide rail (12) or the inner guide rail (13) The limit spring (1121) is sleeved on the spring shaft (1122), and the axial positioning shaft (1123) is sleeved on both ends of the limit spring (1121). One end of the limit spring (1121) is provided with a first insert (1121) inserted into the interior of the spring fixing member (1124), and the other end of the limit spring (1121) is provided with a second insert (1127) inserted into the interior of the connecting rod limit member (1125). The connecting rod limit member (1125) is rotatably connected to the rotating connecting rod (161).

8. The thin-walled pipe inner wall shaping device according to claim 1, characterized in that: The transmission module (2) comprises a motor (41) shaft ball joint (31), a plurality of outer ball sockets (32) and a plurality of inner ball joints (33), wherein the motor (41) shaft ball joint (31) is used to connect to the power module (3), the outer ball socket (32) is provided with a spherical groove (34) for connecting the inner ball joint (33) and the motor (41) shaft ball joint (31), and the motor (41) shaft ball joint (31) and the inner ball joint (33) are both provided with a movable groove (35), a connecting cross bar (36) is provided in the movable groove (35), and second rollers (37) are provided at both ends of the connecting cross bar (36), and a limiting guide rail (38) for sliding the second roller (37) is provided in the spherical groove (34).

9. The thin-walled pipe inner wall shaping device according to claim 1, characterized in that: The power module (3) includes a motor (41), a motor (41) mounting plate and a first movable steel wire rope (43), wherein the motor (41) mounting plate is used for installing the power supply (41), the first movable steel wire rope (43) is connected to the motor (41), and the first movable steel wire rope (43) is used for being pulled by a person to drive the shaping module (1) to move to a specified position.

10. The thin-walled pipe inner wall shaping device according to claim 1, characterized in that: The limiting module (4) includes a positioning baffle (18) and a second movable steel wire rope (51), wherein the positioning baffle (18) is mounted on the guide rail mounting member (11) via a screw (1312), and the second movable steel wire rope (51) is fixedly connected to the positioning baffle (18). The second movable steel wire rope (51) is used for being pulled by a person to drive the shaping module (1) to move to a specified position, and both the first shaping block (16) and the second shaping block (17) are provided with an abutting boss (173) for abutting against the positioning baffle (18).

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