A stress relief device for pipe welds and method of use

Abstract

The application discloses a stress relieving device for pipe welding weld and a use method, two groups of arc-shaped frames are symmetrically arranged, arc-shaped connecting blocks are symmetrically arranged between the two groups of arc-shaped frames through a connecting mechanism, telescopic columns are arranged in the middle of the arc-shaped frames through rotating shaft mechanisms, moving blocks are arranged in the telescopic columns through adaptive adjusting mechanisms, the moving blocks are fixedly connected with the rotating shaft mechanisms, drive rollers are symmetrically arranged at the front ends of the telescopic columns and are driven through drive motors, stress relieving heads are arranged on the arc-shaped connecting blocks through rotating adjusting mechanisms; the drive rollers at the end of the telescopic column which is adaptively adjusted by the adjustable annular whole are matched, so that the device can be adjusted according to pipes of different sizes, the stress relieving heads can be automatically rotated to relieve stress according to the weld, manual operation is not needed, time and labor are saved, the weld stress relieving in the pipe is more convenient, and the device has greatly increased universality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline weld stress relief, in particular to a pipe welding weld stress relief device and use method. BACKGROUND

[0002] In the manufacturing process of casting, welding, forging, machining and the like of workpieces, residual stress will be generated in the workpieces, and the existence of residual stress will inevitably lead to deformation and cracking of the workpieces, seriously affecting the dimensional stability of the workpieces and reducing the fatigue life of the workpieces. In particular, for pipe welding operation, residual stress is concentrated near the weld, and when the welding residual stress and the working stress are superimposed, the value exceeds the yield limit of the material, and the workpiece will crack near the weld. In order to reduce the damage of stress to the pipe weld, stress relief equipment is used to process the weld during mechanical machining.

[0003] The stress relief equipment of the prior art is mostly completed by manual operation, and the operator holds the equipment and processes the weld bit by bit, which is very inconvenient and labor-intensive. Moreover, the diameter of the pipe varies during mechanical machining, and manual operation is very inconvenient for pipes with large or small diameters, and stress relief is not complete, which reduces the quality of the pipe. Therefore, the present application proposes a pipe welding weld stress relief device and use method to solve the problems in the prior art. SUMMARY

[0004] To solve the above problems, the present application proposes a pipe welding weld stress relief device and use method. The pipe welding weld stress relief device adjusts the driving rollers at the ends of the telescopic column through the adjustable annular whole to adapt to the size of the pipe, so that the device can be automatically rotated on the pipe, and the stress at the weld can be automatically relieved by the adjustable stress relief head without manual operation, saving time and effort. At the same time, the device can be freely adjusted according to whether the pipe weld is inside or outside the pipe, making it easier to relieve stress at the pipe weld and greatly increasing its versatility.

[0005] In order to achieve the purpose of the present application, the present application is realized by the following technical scheme: a stress relief device for pipe welding seam, comprising an arc-shaped frame, a connecting mechanism, an arc-shaped connecting block, a rotary driving mechanism, a rotary adjusting mechanism and a stress relief head, two groups of arc-shaped frames are symmetrically arranged, arc-shaped connecting blocks are symmetrically arranged between the two groups of arc-shaped frames through the connecting mechanism, the two groups of arc-shaped connecting blocks and the two groups of arc-shaped frames are spliced to form an adjustable whole circle structure, the rotary driving mechanism comprises a rotary shaft mechanism, an extension column, an adaptive adjusting mechanism, a moving block, a driving roller and a driving motor, the middle port of the arc-shaped frame is designed and the extension column is rotatably arranged through the rotary shaft mechanism, the moving block is slidably arranged in the extension column through the adaptive adjusting mechanism, the moving block is fixedly connected with the rotary shaft mechanism, the driving roller is rotatably arranged at the front end of the extension column, a plurality of groups of driving rollers are symmetrically arranged and the driving rollers are wrapped with a non-slip rubber layer, the driving motor is fixedly arranged outside the extension column, the output end of the driving motor penetrates the inside of the extension column and is connected with the driving roller through a rotary shaft belt and a driving belt, the stress relief head is fixedly arranged on the arc-shaped connecting block through the rotary adjusting mechanism, and two groups of stress relief heads are symmetrically arranged.

[0006] Further improvement lies in that the connecting mechanism comprises an arc-shaped contraction groove, a locking hole and a locking bolt, the arc-shaped contraction grooves are symmetrically arranged in the end faces of the two ends of the arc-shaped frame, the arc-shaped connecting blocks are slidably matched with the arc-shaped contraction grooves by extending into the arc-shaped contraction grooves on the same side of the two groups of arc-shaped frames, the locking holes are distributed on the outer sides of the arc-shaped connecting blocks, a plurality of groups of locking holes are symmetrically arranged, and the locking bolts are arranged outside the arc-shaped frame in threaded connection with the arc-shaped contraction grooves.

[0007] Further improvement lies in that the locking bolt is positioned and matched with the locking hole, the arc-shaped contraction groove is provided with a guide groove, the guide groove is arranged on the abutting surface between the arc-shaped contraction groove and the arc-shaped connecting block, the guide limiting block is fixedly arranged at one end of the inner side of the arc-shaped connecting block, and the guide limiting block is slidably and limitingly matched with the guide groove.

[0008] Further improvement lies in that the rotary shaft mechanism comprises a rotary groove, a rotary column, a rotary square head and an elastic metal limiting sheet, the arc-shaped frame is designed to be disconnected in the middle part and the rotary grooves are arranged in the disconnected sections, the rotary columns are connected between the rotary grooves, the rotary square heads are arranged at the inner side ends of the rotary columns and are fixedly connected with the rotary columns, the elastic metal limiting sheets are symmetrically arranged on the inner side walls of the rotary grooves, the rotary grooves are circularly arranged, the elastic metal limiting sheets are embedded on the inner side annular surfaces of the rotary grooves and have displacement spaces at the ends, the elastic metal limiting sheets are symmetrically arranged in four groups corresponding to the four edges of the rotary square head, the elastic metal limiting sheets are elastically and limitingly arranged in contact with the side surfaces of the rotary square head, and the moving blocks are integrally fixedly connected with the rotary columns on both sides.

[0009] Further improvement lies in that the adaptive adjusting mechanism comprises a through guide groove and a compression spring, the telescopic column is internally provided with the through guide groove at one end away from the driving roller, the through guide groove is open at both sides and has an opening smaller than the width of the moving block, the moving block is arranged in the through guide groove and is in sliding fit with the through guide groove, the moving block is internally provided with the compression spring at one side, and the compression spring is fixedly connected with the through guide groove and the moving block at both ends, and the rotating shaft mechanism is fixedly connected with the moving block through the through guide groove, and the two groups of rotating columns in the rotating shaft mechanism are fixedly and integrally connected with the two sides of the moving block and are arranged in the opening of the through guide groove and in rotating fit with the rotating groove.

[0010] Further improvement lies in that the rotating adjusting mechanism comprises a connecting groove, a rotating connecting seat, a telescopic adjusting rod and a positioning mechanism, the middle part of the arc-shaped connecting block is also designed to be disconnected, and the connecting groove is arranged in the disconnected section, the rotating connecting seat is arranged between the connecting grooves, the rotating connecting seat is provided with the rotating connecting caps at both ends, the rotating connecting seat is in rotating fit with the connecting grooves through the rotating connecting caps at both sides, the telescopic adjusting rod is arranged on the rotating connecting seat, the telescopic adjusting rod is fixedly connected with the stress relieving head at the telescopic end, so that the stress relieving head can be adjusted according to the requirement to adjust the tightness of the contact with the weld, so that the stress relieving effect is controllable, and the guide rods are symmetrically arranged between the stress relieving head and the rotating connecting seat, and the positioning mechanism is arranged between the rotating connecting seat and the arc-shaped connecting block.

[0011] Further improvement lies in that the positioning mechanism comprises a contraction groove, a round head positioning column, a reset spring and a positioning hole, the contraction grooves are symmetrically arranged at both sides of the connecting groove on the middle part of the disconnected section of the arc-shaped connecting block, the round head positioning column is arranged in the contraction groove, the round head positioning column is provided with the limiting cap at the inner end of the contraction groove, and the outer end is in the shape of a spherical head, the reset spring is connected between the limiting cap and the contraction groove at the tail end of the round head positioning column, and the limiting cap and the bottom end of the contraction groove are fixedly connected at both ends of the reset spring, the positioning holes are symmetrically arranged at both sides of the rotating connecting seat, the rotating connecting seat is symmetrically provided with two groups of the positioning holes with the rotating connecting caps as the centers on one side, and the end part of the round head positioning column is in positioning fit with the positioning hole.

[0012] A use method of a stress relieving device for a pipe welding weld, comprising the following steps:

[0013] Step one, the weld to be relieved of stress according to the requirement of the pipeline is located on the inner and outer sides of the pipeline, the telescopic column is rotated, the direction of the driving roller is adjusted, the direction of the stress relieving head is adjusted by adjusting the rotating connecting seat, the direction of the driving roller is consistent, then the locking bolt is loosened, the overall ring type is adjusted to a proper size according to the diameter of the pipeline, and then the locking bolt is tightened;

[0014] Step two, then the telescopic column compression, placed in the pipeline or outside the pipeline set in the drive roller is opposite the weld, then loosen the telescopic column drive roller and the pipe surface contact, then according to the stress relief requirements start telescopic adjusting rod control stress relief head close to or contact with the weld;

[0015] Step three, then turn on the external power supply to start the drive motor, while starting the stress relief head;

[0016] Step four, through the drive motor belt drive drive roller around the pipe rotation, so that the whole device set in the pipe outside or inside the pipe rotation, drive stress relief head to the weld stress relief.

[0017] The beneficial effects of the present application are: the present application through the adjustable annular whole fitting telescopic column end of the drive roller, so that the device can be adjusted according to the different size of the pipe, make it stick on the pipe automatic rotation, and through the adjustable stress relief head to the weld automatic stress relief, without manual operation, save time and labor and wide application range;

[0018] Through the rotation of the telescopic column and the rotation of the adjustable stress relief head can be adjusted according to the pipe weld inside or outside the pipe, so that the pipe internal weld stress relief is more convenient, greatly increase the versatility. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a perspective view of embodiment 1 of the present application.

[0020] Figure 2 It is a top view of embodiment 1 of the present application.

[0021] Figure 3 It is a side view of embodiment 1 of the present application.

[0022] Figure 4 It is a rotating groove inside section view of embodiment 1 of the present application.

[0023] Figure 5 It is an enlarged view of A of embodiment 1 of the present application.

[0024] Figure 6 It is an enlarged view of B of embodiment 1 of the present application.

[0025] Figure 7 It is an enlarged view of C of embodiment 1 of the present application.

[0026] Figure 8 It is a flow chart of the use method of embodiment 2 of the present application.

[0027] The components include: 1. Arc-shaped frame; 2. Arc-shaped connecting block; 3. Stress relief head; 4. Telescopic column; 5. Moving block; 6. Drive roller; 7. Drive motor; 8. Arc-shaped shrinkage groove; 9. Locking hole; 10. Locking bolt; 11. Guide groove; 12. Guide limit block; 13. Rotating groove; 14. Rotating column; 15. Rotating square head; 16. Elastic metal limit piece; 17. Through guide groove; 18. Compression spring; 19. Connecting groove; 20. Rotating connecting seat; 21. Telescopic adjustment rod; 22. Shrinkage groove; 23. Round head positioning column; 24. Return spring; 25. Positioning hole. Detailed Implementation

[0028] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0029] Example 1

[0030] according to Figures 1-7 As shown, this embodiment provides a stress relief device for pipe welding seams, including an arc-shaped frame 1, a connecting mechanism, an arc-shaped connecting block 2, a rotation drive mechanism, a rotation adjustment mechanism, and a stress relief head 3. Two sets of arc-shaped frames 1 are symmetrically arranged, and arc-shaped connecting blocks 2 are symmetrically arranged between the two sets of arc-shaped frames 1 via the connecting mechanism. The two sets of arc-shaped connecting blocks and the two sets of arc-shaped frames are spliced ​​together to form an adjustable circular structure. The rotation drive mechanism includes a rotation shaft mechanism, a telescopic column 4, an adaptive adjustment mechanism, a moving block 5, a drive roller 6, and a drive motor 7. The middle port of the arc-shaped frame 1 is designed and... A telescopic column 4 is rotatably mounted via a rotating shaft mechanism. Inside the telescopic column 4, a movable block 5 is slidably mounted via an adaptive adjustment mechanism. The movable block 5 is fixedly connected to the rotating shaft mechanism. A drive roller 6 is symmetrically mounted on the front end of the telescopic column 4 via a rotating shaft mechanism. Multiple sets of drive rollers are symmetrically mounted, and the drive rollers are covered with an anti-slip rubber layer. A drive motor 7 is fixedly mounted on the outside of the telescopic column 4. The output end of the drive motor 7 passes through the inside of the telescopic column and is driven by the drive roller 6 via a rotating shaft belt. A stress relief head 3 is fixedly mounted on the arc-shaped connecting block 2 via a rotating adjustment mechanism. Two sets of stress relief heads are symmetrically mounted.

[0031] The connecting mechanism includes an arc-shaped shrinkage groove 8, a locking hole 9, and a locking bolt 10. The arc-shaped shrinkage groove 8 is symmetrically provided on the end faces of both ends of the arc-shaped frame 1. The arc-shaped connecting block 2 extends into the arc-shaped shrinkage groove 8 on the same side of the two sets of arc-shaped frames 1 and slides and expands with the arc-shaped shrinkage groove. The outer side of the arc-shaped connecting block 2 is provided with locking holes 9, and multiple sets of locking holes are symmetrically provided. The outer side of the arc-shaped frame 1 is provided with a locking bolt 10, and the locking bolt is threaded through the outer side of the arc-shaped shrinkage groove of the arc-shaped frame.

[0032] The locking bolt 10 is positioned and matched with the locking hole 9, the inner side of the arc-shaped contraction groove 8 is provided with a guide groove 11, the guide groove is arranged on the inner side butt joint surface of the arc-shaped contraction groove and the arc-shaped connecting block, the inner side surface of the arc-shaped connecting block 2 is fixedly provided with a guide limiting block 12, the guide limiting block 12 extends into the guide groove and is slidingly limited and matched with the guide groove 11.

[0033] The rotating shaft mechanism comprises rotating grooves 13, rotating columns 14, rotating square heads 15 and elastic metal limiting pieces 16, the middle part of the arc-shaped frame 1 is designed to be disconnected, and the disconnection section is provided with the rotating grooves 13, the rotating grooves 13 are connected through the rotating columns 14, the inner side end of the rotating column 14 is provided with the rotating square head 15, the rotating square head is fixedly connected with the rotating column, the inner side wall of the rotating groove 13 is symmetrically provided with the elastic metal limiting pieces 16, the rotating groove is circularly arranged, the elastic metal limiting pieces are embedded on the inner side annular surface of the rotating groove and leave displacement spaces at the ends, the elastic metal limiting pieces are symmetrically provided with four groups of four edges corresponding to the rotating square head respectively, the elastic metal limiting pieces 16 are elastically and limitingly in contact with the side surface of the rotating square head 15, and the two sides of the moving square 5 are integrally fixedly connected with the rotating column 14.

[0034] The adaptive adjusting mechanism comprises a through guide groove 17 and a compression spring 18, the inner side of the end of the telescopic column 4 away from the driving roller 6 is provided with the through guide groove 17, the through guide groove is open at both sides and the opening is smaller than the width of the moving square, the moving square 5 is arranged in the through guide groove 17 and is slidingly matched with the through guide groove 17, the one side of the moving square 5 is provided with the compression spring 18 inside the one end of the through guide groove 17, the two ends of the compression spring are fixedly connected with the through guide groove and the moving square respectively, the rotating shaft mechanism is fixedly connected with the moving square 5 through the through guide groove 17, and the two groups of rotating columns in the rotating shaft mechanism are fixedly and integrally connected with the two sides of the moving square and extend out of the opening of the through guide groove and are rotationally matched with the rotating grooves.

[0035] The rotating adjusting mechanism comprises a connecting groove 19, a rotating connecting seat 20, a telescopic adjusting rod 21 and a positioning mechanism, the middle part of the arc-shaped connecting block 2 is also designed to be disconnected, and the disconnection section is provided with the connecting groove 19, the connecting groove 19 is provided with the rotating connecting seat 20, the two ends of the rotating connecting seat are provided with rotating connecting caps, the rotating connecting seat is rotationally connected with the connecting groove through the rotating connecting caps at both sides, the rotating connecting seat 20 is provided with the telescopic adjusting rod 21, the telescopic end of the telescopic adjusting rod 21 is fixedly connected with the stress relieving head 3, so that the stress relieving head can be adjusted according to the demand to adjust the tightness of the contact with the weld, so that the stress relieving effect is controllable, a guide rod is also symmetrically arranged between the stress relieving head and the rotating connecting seat, and the positioning mechanism is arranged between the rotating connecting seat 20 and the arc-shaped connecting block 2.

[0036] The positioning mechanism comprises a contraction groove 22, a round head positioning column 23, a reset spring 24 and a positioning hole 25. The contraction groove 22 is symmetrically arranged on both sides of the connecting groove in the middle section of the arc-shaped connecting block 2. The round head positioning column 23 is arranged in the contraction groove 22. The round head positioning column is provided with a limiting cap at the inner side end of the contraction groove. The outer side end is in the shape of a round ball head. The reset spring 24 is connected between the limiting cap at the tail end of the round head positioning column 23 and the bottom end of the contraction groove 22. The two ends of the reset spring are fixedly connected with the limiting cap and the bottom end of the contraction groove. The positioning hole 25 is symmetrically arranged on both sides of the rotating connecting seat 20. The rotating connecting seat is symmetrically provided with two groups of the positioning hole 25 on one side with the rotating connecting cap as the center. The end of the round head positioning column 23 is positioned and matched with the positioning hole 25.

[0037] Embodiment 2

[0038] According to Figure 8 As shown in the figure, the embodiment provides a use method of a stress relief device for a pipe welding seam, comprising the following steps:

[0039] Step one, according to the need of the pipe to eliminate the stress of the welding seam, which is located on the inner and outer sides of the pipe, rotate the telescopic column 4, adjust the direction of the driving roller 6, when the welding seam on the outer side of the pipe needs to be stress relieved, the driving roller is directed to the inner side of the whole ring body, when the welding seam on the inner side of the pipe needs to be stress relieved, the driving roller is directed to the outer side of the whole ring body, at the same time, adjust the rotating connecting seat 20 to adjust the direction of the stress relief head 3 to be consistent with the direction of the driving roller 6, then loosen the locking bolt 10, adjust the whole ring body to the appropriate size according to the diameter of the pipe, and then tighten the locking bolt 10 to make it adapt to the locking hole and be locked;

[0040] Step two, then compress the telescopic column 4, at this time, the moving block moves in the through guide groove, the compression spring is compressed, then place the device in the pipe or around the pipe to make the driving roller 6 and the stress relief head face the welding seam, then loosen the telescopic column 4, the compression spring resets to push out the telescopic column, so that the end of the driving roller 6 contacts the inner or outer surface of the pipe, then start the telescopic adjusting rod 21 to control the stress relief head 3 to be close to or contact the welding seam according to the stress relief requirement, and adjust the stress relief head to be close to the welding seam to control the stress relief;

[0041] Step three, then connect the external power supply to start the driving motor 7, and start the stress relief head 3 at the same time.

[0042] Step four, drive a plurality of driving rollers 6 to rotate around the pipe through the belt and rotating shaft transmission of the driving motor 7, so that the whole device rotates around the outside of the pipe or is clamped in the pipe to drive the stress relief head 3 to relieve the stress of the welding seam.

[0043] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A stress relief device for pipe weld seams, characterized in that: The system includes an arc frame (1), a connecting mechanism, an arc connecting block (2), a rotation drive mechanism, a rotation adjustment mechanism, and a stress relief head (3). The arc frame (1) is symmetrically arranged in two sets. The two sets of arc frames (1) are symmetrically arranged with arc connecting blocks (2) through the connecting mechanism. The two sets of arc connecting blocks and the two sets of arc frames are spliced ​​together to form an adjustable circular structure. The rotation drive mechanism includes a rotation shaft mechanism, a telescopic column (4), an adaptive adjustment mechanism, a moving block (5), a drive roller (6), and a drive motor (7). The arc frame (1) is provided with a telescopic column (4) through the rotation shaft mechanism in the middle. The telescopic column (4) is provided with a moving block (5) through the adaptive adjustment mechanism inside. The moving block (5) is fixedly connected to the rotation shaft mechanism. The telescopic column (4) is symmetrically arranged with drive rollers (6) at the front end. The telescopic column (4) is provided with a drive motor (7) on the outside. The drive motor (7) and the drive roller (6) are belt driven. The arc connecting block (2) is provided with a stress relief head (3) through the rotation adjustment mechanism. The rotating shaft mechanism includes a rotating groove (13), a rotating column (14), a rotating square head (15), and an elastic metal limiting piece (16). The arc frame (1) is designed with a break in the middle and a rotating groove (13) is provided in the cross section. The rotating grooves (13) are connected by the rotating column (14). The rotating square head (15) is provided on the inner end of the rotating column (14). The elastic metal limiting pieces (16) are symmetrically provided on the inner side wall of the rotating groove (13). The elastic metal limiting pieces (16) are limited by the side of the rotating square head (15). The moving block (5) is fixedly connected to the rotating column (14). The adaptive adjustment mechanism includes a through guide groove (17) and a compression spring (18). The telescopic column (4) has a through guide groove (17) on its inner side away from the drive roller (6). The movable block (5) is set in the through guide groove (17) and is slidably adapted to it. A compression spring (18) is provided inside one side of the movable block (5) and one end of the through guide groove (17). The rotating shaft mechanism passes through the through guide groove (17) and is fixedly connected to the movable block (5). The rotation adjustment mechanism includes a connecting groove (19), a rotating connecting seat (20), a telescopic adjustment rod (21), and a positioning mechanism. The arc-shaped connecting block (2) is also designed to be disconnected in the middle and has a connecting groove (19) in the cross section. A rotating connecting seat (20) is provided between the connecting grooves (19). A telescopic adjustment rod (21) is provided on the rotating connecting seat (20). The telescopic end of the telescopic adjustment rod (21) is fixedly connected to the stress relief head (3). A positioning mechanism is provided between the rotating connecting seat (20) and the arc-shaped connecting block (2).

2. The stress relief device for pipe welding seams according to claim 1, characterized in that: The connecting mechanism includes an arc-shaped shrinkage groove (8), a locking hole (9), and a locking bolt (10). The arc-shaped frame (1) has symmetrical arc-shaped shrinkage grooves (8) at both ends. The arc-shaped connecting block (2) extends into the arc-shaped shrinkage grooves (8) on the same side of the two sets of arc-shaped frames (1). The outer side of the arc-shaped connecting block (2) has locking holes (9). The outer side of the arc-shaped frame (1) has locking bolts (10).

3. The stress relief device for pipe welding seams according to claim 2, characterized in that: The locking bolt (10) is adapted to the locking hole (9), the inner side of the arc-shaped shrinkage groove (8) is provided with a guide groove (11), the inner side end of the arc-shaped connecting block (2) is provided with a guide limiting block (12), and the guide limiting block (12) is adapted to slide limit with the guide groove (11).

4. The stress relief device for pipe weld seams according to claim 1, characterized in that: The positioning mechanism includes a shrinkage groove (22), a round-headed positioning post (23), a return spring (24), and a positioning hole (25). The arc-shaped connecting block (2) has a symmetrical shrinkage groove (22) on its middle cross section. The shrinkage groove (22) has a round-headed positioning post (23) inside it. The tail end of the round-headed positioning post (23) is connected to the shrinkage groove (22) with a return spring (24). The rotating connecting seat (20) has symmetrical positioning holes (25) on both sides. The end of the round-headed positioning post (23) is adapted to the positioning hole (25).

5. A method of using a stress relief device for pipe welds according to any one of claims 2-3, characterized in that, Includes the following steps: Step 1: According to the pipeline, the weld seam that needs stress relief is located inside and outside the pipeline. Rotate the telescopic column (4), adjust the direction of the drive roller (6), and at the same time adjust the rotating connecting seat (20) to adjust the direction of the stress relief head (3) to be consistent with the direction of the drive roller (6). Then loosen the locking bolt (10), adjust the overall ring shape to the appropriate size according to the pipeline diameter, and then tighten the locking bolt (10). Step 2: Then compress the telescopic column (4) and place it inside the pipe or outside the pipe so that the drive roller (6) is facing the weld. Then release the telescopic column (4) so ​​that the drive roller (6) contacts the pipe surface. Then, according to the stress relief requirements, start the telescopic adjustment rod (21) to control the stress relief head (3) to be close to or in contact with the weld. Step 3: Then connect the external power supply to start the drive motor (7) and start the stress relief head (3) at the same time. Step 4: Drive the drive roller (6) to rotate around the pipe by the belt drive of the drive motor (7), so that the entire device is wrapped around the outside of the pipe or stuck inside the pipe and rotates, driving the stress relief head (3) to relieve stress at the weld.

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