An inner mouthpiece capable of fixing the gap width

Abstract

An inner aligning device with fixed seam width, comprising a walking mechanism and an inner centering device, further comprising a fixed seam width mechanism; the fixed seam width mechanism comprises a telescopic cylinder II, the shell is provided with a plurality of telescopic cylinders II at positions corresponding to the positions of the two tensioning devices, and the telescopic rods of the telescopic cylinders II are directed to the outside of the shell, the extending end of the telescopic rod is provided with a groove, a fixed seam block is slidably fitted in the groove, a spring is arranged between the fixed seam block and the groove bottom, a contact switch is arranged at the position corresponding to the center of the spring on the groove bottom, a limiting step is arranged in the groove for limiting the fixed seam block from continuing to move downward after the contact switch is triggered by the fixed seam block, and a cap is mounted on the extending end of the telescopic rod for preventing the fixed seam block from falling out; a tapered fixed seam needle is arranged at the end of the fixed seam block away from the telescopic cylinder II; the present application can quickly and accurately determine the reserved weld width between the pipe mouths of two pipes, and greatly improves the operation efficiency of pipe butt joint.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe butt joint, in particular to an inner butt joint device capable of fixing the width of a weld. BACKGROUND

[0002] It is known that the inner butt joint device is used to ensure that two pipes are coaxial during butt joint operation, which generally comprises a walking mechanism and an inner centering device, the walking mechanism is used to drive the inner centering device to walk along the pipes; the inflation boots of the inner centering device can expand radially to abut against the inner wall of the pipes, so that the two pipes are coaxial with the inner centering device, thereby achieving the purpose of mutual coaxiality; however, during pipe butt joint, not only the coaxiality needs to be ensured, but also a suitable reserved width between the pipe openings of the two pipes needs to be ensured, so as to ensure that the weld width meets the technical requirements; however, it is difficult to ensure a suitable reserved width between the pipe openings of the two pipes during actual operation, generally, the pipes are large in size and need to be butt jointed with the assistance of hoisting equipment, the operation precision is difficult to ensure, repeated adjustment is required, and when the reserved width is too narrow, a crowbar needs to be used to separate the two pipes, which is easy to damage the pipe openings during operation and causes difficulties to subsequent welding operation; the above defects are problems to be solved by those skilled in the art. SUMMARY

[0003] In order to overcome the difficulty in ensuring a suitable reserved width between the pipe openings of the two pipes during pipe butt joint in the background art, the present application discloses an inner butt joint device capable of fixing the width of a weld.

[0004] In order to achieve the above-mentioned application purposes, the present application adopts the following technical solutions:

[0005] An inner butt joint device capable of fixing the width of a weld, comprising a walking mechanism and an inner centering device, one end of the inner centering device is provided with a walking mechanism used to drive the inner centering device to walk along the pipes; further comprising a weld width fixing mechanism; the inner centering device comprises a shell and a tensioning device, both ends of the shell are provided with the tensioning device;

[0006] The weld width fixing mechanism comprises a telescopic cylinder II, a plurality of telescopic cylinders II are uniformly arranged at positions between the two tensioning devices of the shell, and the telescopic rods of the telescopic cylinders II are directed outward from the shell, the extending end of the telescopic rod is provided with a groove, a weld width fixing block is slidably fitted in the groove, a spring is arranged between the weld width fixing block and the groove bottom, a contact switch is arranged at the center position of the groove bottom, a limiting step is arranged in the groove for limiting the weld width fixing block from continuing to move downward after the contact switch is triggered by the weld width fixing block, and a cap is mounted at the extending end of the telescopic rod to prevent the weld width fixing block from falling out; one end of the weld width fixing block away from the telescopic cylinder II is provided with a tapered weld width fixing needle.

[0007] Preferably, the tensioning device comprises a fixed frame, a telescopic cylinder I and a bulge, the outer edge of the fixed frame is coaxially fastened to the shell, a protrusion is arranged at the center of the fixed frame and faces the outside of the shell, a telescopic cylinder I is arranged at the protrusion and faces the inside of the shell, the telescopic cylinder I is coaxial with the shell, a connecting disc is coaxially fastened to the telescopic cylinder I, a plurality of sliding holes are uniformly and interval arranged on the outer edge of the fixed frame, a sliding rod is slidingly arranged in the sliding hole and protrudes out of the sliding hole, a bulge is arranged at the end of the sliding rod protruding out of the fixed frame, a connecting rod is hingedly arranged at the other end of the sliding rod, and the other end of the connecting rod is hingedly connected to the outer edge of the connecting disc.

[0008] Preferably, a plurality of balls are embedded in the four corner ends of the top of the bulge away from the walking mechanism, and the balls are rollingly connected to the bulge.

[0009] Preferably, the seam fixing needle is threadedly connected to the seam fixing block.

[0010] Preferably, a guide cover is arranged on the side of the inner centering device away from the walking mechanism.

[0011] Preferably, the guide cover comprises arc-shaped elastic sheets which are arranged at intervals along the circumferential direction, and the inner side of the arc-shaped elastic sheet is fastened to the inner centering device through a support.

[0012] Preferably, a hanging plate is arranged at the position close to the inner centering device on the top of the walking mechanism, and a plurality of hanging holes are arranged at intervals along the length direction of the walking mechanism.

[0013] Preferably, the telescopic cylinder I and the telescopic cylinder II are both hydraulic telescopic cylinders.

[0014] By adopting the technical scheme, the present application has the following advantages:

[0015] The present application discloses an inner aligning device capable of fixing the width of a seam, which has simple structure and is convenient to use, can quickly and accurately determine the reserved seam width between the pipe openings of two pipes, and greatly improves the working efficiency of pipe butt joint; the seam width fixing mechanism comprises a telescopic cylinder II, a plurality of telescopic cylinders II are uniformly and interval arranged at the position between the two tensioning devices of the shell, the protruding end of the telescopic rod is provided with a groove, a seam fixing block is slidingly arranged in the groove, a spring is arranged between the seam fixing block and the groove bottom, a contact switch is arranged at the position corresponding to the center of the spring on the groove bottom, a limiting step is arranged in the groove for limiting the continuous downward movement of the seam fixing block after the contact switch is triggered by the seam fixing block, that is, the telescopic cylinder II can drive the corresponding seam fixing block to expand or contract radially, and when the seam fixing block expands radially and meets resistance, the contact switch can be triggered, thereby controlling the extension of the telescopic cylinder II, avoiding the accidental contact of the seam fixing block with the inner wall of the pipe, and causing damage to the inner wall of the pipe; the tapered seam fixing needle can reduce the contact area with the pipe opening, facilitate the control of the seam fixing needle to retract into the pipe after the pipe is positioned, and avoid the adhesion of welding slag on the needle body of the seam fixing needle during welding operation, thereby affecting the subsequent seam fixing operation. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a structural schematic diagram of the present application;

[0017] Fig. 2 is a structural schematic diagram of the inner centering device;

[0018] Fig. 3 is a structural schematic diagram of the seam width setting mechanism;

[0019] Fig. 4 is a structural schematic diagram of the boot with balls;

[0020] Fig. 5 is a structural schematic diagram of the guide cover.

[0021] In the figure: 1, walking mechanism; 2, inner centering device; 2-1, shell; 2-2, fixed frame; 2-3, telescopic cylinder I; 2-4, boot; 2-5, connecting disc; 2-6, sliding hole; 2-7, sliding rod; 2-8, connecting rod; 2-9, ball; 3, seam width setting mechanism; 3-1, telescopic cylinder II; 3-2, seam setting block; 3-3, spring; 3-4, contact switch; 3-5, cap; 3-6, seam setting needle; 4, guide cover; 4-1, arc spring sheet; 4-2, bracket; 5, hanging plate. DETAILED DESCRIPTION

[0022] The present application can be explained in detail by the following examples, the purpose of the disclosure is to protect all technical improvements within the scope of the present application, in the description of the present application, it is understood that if there are terms "up", "down", "front", "back", "left", "right" and the like indicating the orientation or position relationship, only corresponds to the drawings of the present application, in order to facilitate the description of the present application, and is not indicative or implied that the device or element must have a particular orientation.

[0023] Example one:

[0024] Combined with the drawings Figs. 1-3 A inner aligning device with seam width setting function, comprising a walking mechanism 1 and an inner centering device 2, one end of the inner centering device 2 is provided with a walking mechanism 1 for driving it to walk along the pipeline, that is, the inner centering device 2 can be driven to walk along the pipeline by the walking mechanism 1; further comprising a seam width setting mechanism 3; the inner centering device 2 comprises a shell 2-1 and a tensioning device, both ends of the shell 2-1 are provided with a tensioning device;

[0025] The tensioning device comprises a fixed frame 2-2, a telescopic cylinder I 2-3 and a tensioning shoe 2-4, the outer edge of the fixed frame 2-2 is fixedly connected with the shell 2-1 coaxially, a protruding part is arranged at the center position of the fixed frame 2-2 and faces the outer side of the shell 2-1, a telescopic rod of the telescopic cylinder I 2-3 is arranged at the protruding part and faces the inner side of the shell 2-1, the telescopic cylinder I 2-3 is coaxial with the shell 2-1, and a connecting disc 2-5 is fixedly connected with the extension end of the telescopic rod of the telescopic cylinder I 2-3 coaxially; a plurality of sliding holes 2-6 are uniformly and spaced arranged at the outer edge of the fixed frame 2-2, a sliding rod 2-7 is slidably arranged in the sliding holes 2-6 and extends out of the sliding holes 2-6 at both ends, the tensioning shoe 2-4 is arranged at the end of the sliding rod 2-7 extending out of the fixed frame 2-2, and a connecting rod 2-8 is hingedly arranged at the other end of the sliding rod 2-7; the other end of the connecting rod 2-8 is hingedly connected with the outer edge of the connecting disc 2-5, that is, the connecting disc 2-5 can be driven to move by the telescopic cylinder I 2-3;

[0026] When the telescopic rod of the telescopic cylinder I 2-3 is extended, the connecting disc 2-5 drives the connecting rod 2-8, the connecting rod 2-8 drives the sliding rod 2-7, and then the tensioning shoe 2-4 is expanded radially, so that the tensioning shoe 2-4 can abut against the inner wall of the pipeline, so that the inner centering device 2 is coaxial with the pipeline; on the contrary, when the telescopic rod of the telescopic cylinder I 2-3 is shortened, the connecting disc 2-5 drives the connecting rod 2-8, the connecting rod 2-8 drives the sliding rod 2-7, and then the tensioning shoe 2-4 is contracted radially, so that the tensioning shoe 2-4 is separated from the inner wall of the pipeline, so that the traveling mechanism 1 can drive the inner centering device 2 to travel along the pipeline;

[0027] The seam width fixing mechanism 3 comprises a telescopic cylinder II 3-1, a plurality of telescopic cylinders II 3-1 are uniformly and spaced arranged at the position between the two tensioning devices of the shell 2-1, and the telescopic rod of the telescopic cylinder II 3-1 faces the outer side of the shell, the extension end of the telescopic rod is provided with a groove, a seam fixing block 3-2 is slidably arranged in the groove, a spring 3-3 is arranged between the seam fixing block 3-2 and the groove bottom, the groove bottom is provided with a contact switch 3-4 at the center position corresponding to the spring 3-3, and a limiting step is arranged in the groove for limiting the seam fixing block 3-2 from continuing to move downward after the contact switch 3-4 is triggered by the seam fixing block 3-2; that is, the telescopic cylinder II 3-1 can drive the corresponding seam fixing block 3-2 to expand or contract radially, and when the seam fixing block 3-2 encounters resistance when expanding radially, the contact switch 3-4 can be triggered, so as to control the telescopic cylinder II 3-1 to be extended, so as to avoid that the seam fixing block 3-2 abuts against the inner wall of the pipeline accidentally, and causes damage to the inner wall of the pipeline;

[0028] The extension end of the telescopic rod is provided with a cap 3-5 for preventing the seam fixing block 3-2 from falling out; one end of the seam fixing block 3-2 away from the telescopic cylinder II 3-1 is provided with a tapered seam needle 3-6;

[0029] When in use, the inner centering device 2 can be pushed to the pipe opening by the walking mechanism 1, which ensures that the seam width setting mechanism 3 is fully extended out of the pipe opening, controls the extension of the telescopic cylinder II 3-1, and makes the seam block 3-2 drive the radial expansion of the seam needle 3-6; then the inner centering device 2 is pulled close to the pipe opening by the walking mechanism 1 until the needle body of the seam needle 3-6 contacts the pipe opening; the radial expansion of the tensioning device close to the walking mechanism 1 is controlled to make the inner centering device 2 coaxial with the pipe and achieve the purpose of axial positioning; then the other pipe can be hoisted to make the pipe fit into the inner centering device 2, as far as possible to keep coaxial with the inner centering device 2, and make the pipe opening contact the needle body of the seam needle 3-6, which can ensure that the two pipe openings have appropriate seam width; the radial expansion of the tensioning device away from the walking mechanism 1 is controlled to make the two coaxial and positioned, which can spot weld and position the two pipe openings; after the two pipes are spot welded and positioned, the telescopic cylinder II 3-1 is controlled to shorten and reset, which makes the seam needle 3-6 retract into the pipe, and the two pipe openings can be fully welded; the tapered seam needle 3-6 can reduce the contact area with the pipe opening, facilitate the control of the seam needle 3-6 retracting into the pipe after the pipe is positioned, and avoid the adhesion of welding slag on the needle body of the seam needle 3-6 during welding operation, which affects the subsequent seam operation.

[0030] Example two:

[0031] Combined with the drawings Figs. 1-5 An inner pipe aligning device capable of setting seam width, comprising a walking mechanism 1 and an inner centering device 2, one end of the inner centering device 2 is provided with a walking mechanism 1 for driving it to walk along the pipe, that is, the inner centering device 2 can be driven to walk along the pipe by the walking mechanism 1; according to the needs, a seam width setting mechanism 3 is further included; the inner centering device 2 comprises a shell 2-1 and a tensioning device, both ends of the shell 2-1 are provided with a tensioning device;

[0032] The tensioning device comprises a fixed frame 2-2, a telescopic cylinder I 2-3 and a tensioning shoe 2-4, the outer edge of the fixed frame 2-2 is coaxially and tightly connected with the shell 2-1, the center position of the fixed frame 2-2 is provided with a protruding part towards the outside of the shell 2-1, the protruding part is provided with a telescopic cylinder I 2-3 towards the inside of the shell 2-1, and the telescopic cylinder I 2-3 is coaxial with the shell 2-1, the telescopic rod of the telescopic cylinder I 2-3 is coaxially and tightly connected with a connecting disc 2-5; a plurality of sliding holes 2-6 are uniformly and interval arranged on the outer edge of the fixed frame 2-2, the sliding holes 2-6 are slidingly fitted with a sliding rod 2-7, both ends of which are extended out of the sliding hole 2-6, the end of the sliding rod 2-7 extended out of the fixed frame 2-2 is provided with the tensioning shoe 2-4, and the other end of the sliding rod 2-7 is hingedly connected with a connecting rod 2-8, the other end of the connecting rod 2-8 is hingedly connected with the outer edge of the connecting disc 2-5, that is, the connecting disc 2-5 can be driven to move by the telescopic cylinder I 2-3;

[0033] When the telescopic rod of telescopic cylinder Ⅰ 2-3 is extended, the connecting disc 2-5 pushes the connecting rod 2-8, the connecting rod 2-8 pushes the sliding rod 2-7, and then pushes the expansion shoe 2-4 to expand radially, so that the expansion shoe 2-4 can abut against the inner wall of the pipeline, so that the inner centering device 2 is coaxial with the pipeline; on the contrary, when the telescopic rod of telescopic cylinder Ⅰ 2-3 is shortened, the connecting disc 2-5 pulls the connecting rod 2-8, the connecting rod 2-8 pulls the sliding rod 2-7, and then pulls the expansion shoe 2-4 to contract radially and reset, the expansion shoe 2-4 is separated from the inner wall of the pipeline, so that the walking mechanism 1 can drive the inner centering device 2 to walk along the pipeline;

[0034] The seam setting mechanism 3 comprises telescopic cylinders Ⅱ 3-1, the shell 2-1 is provided with a plurality of telescopic cylinders Ⅱ 3-1 at positions corresponding to the intervals between the two expansion devices, and the telescopic rods of the telescopic cylinders Ⅱ 3-1 are directed outward from the shell, the extending end of the telescopic rod is provided with a groove, a seam setting block 3-2 is slidably fitted in the groove, a spring 3-3 is arranged between the seam setting block 3-2 and the groove bottom, a contact switch 3-4 is arranged at a position corresponding to the center of the spring 3-3 on the groove bottom, and a limiting step is arranged in the groove for limiting the continuous downward movement of the seam setting block 3-2 after the contact switch 3-4 is triggered by the seam setting block 3-2, that is, the telescopic cylinder Ⅱ 3-1 can drive the corresponding seam setting block 3-2 to expand or contract radially, and when the seam setting block 3-2 encounters resistance during radial expansion, the contact switch 3-4 can be triggered, so as to control the extension of the telescopic cylinder Ⅱ 3-1, avoid the accidental abutment of the seam setting block 3-2 against the inner wall of the pipeline, and cause damage to the inner wall of the pipeline. The limiting step can prevent the seam needle 3-6 from being retracted into the groove during the seam setting operation; a cap 3-5 is mounted on the extending end of the telescopic rod to prevent the seam setting block 3-2 from falling out; a tapered seam needle 3-6 is arranged at one end of the seam setting block 3-2 away from the telescopic cylinder Ⅱ 3-1; according to needs, the seam needle 3-6 is threadedly connected with the seam setting block 3-2, that is, different specifications of seam needles 3-6 can be replaced according to needs, so as to adjust the seam width;

[0035] When in use, the inner centering device 2 can be pushed to the pipe opening by the walking mechanism 1, which ensures that the gap setting mechanism 3 is completely extended out of the pipe opening, controls the extension of the telescopic cylinder II 3-1, and makes the gap setting block 3-2 drive the radial expansion of the gap setting needle 3-6; then the inner centering device 2 is pulled close to the pipe opening by the walking mechanism 1 until the needle body of the gap setting needle 3-6 contacts the pipe opening; the radial expansion of the tensioning device close to the walking mechanism 1 is controlled, so that the inner centering device 2 is coaxial with the pipe and the purpose of axial positioning is achieved; then the other pipe can be hoisted, the pipe is sleeved into the inner centering device 2, and the pipe opening is contacted with the needle body of the gap setting needle 3-6 as much as possible, which can ensure that the two pipe openings have a suitable weld gap; the radial expansion of the tensioning device away from the walking mechanism 1 is controlled, so that the two coaxial and positioned pipes can be spot-welded and positioned, and after the two pipes are spot-welded and positioned, the telescopic cylinder II 3-1 is controlled to be shortened and reset, so that the gap setting needle 3-6 is retracted into the pipe, and the two pipe openings can be fully welded; the tapered gap setting needle 3-6 can reduce the contact area with the pipe opening, facilitate the control of the gap setting needle 3-6 retracted into the pipe after the pipe is positioned, and avoid the adhesion of welding slag on the needle body of the gap setting needle 3-6 during welding operation, which affects the subsequent gap setting operation;

[0036] In addition, the four corner ends of the top of the inflation shoe 2-4 away from the walking mechanism 1 are embedded with balls 2-9, and the balls 2-9 are in rolling cooperation with the inflation shoe 2-4, that is, when the two pipes are butt-jointed, the radial expansion of the tensioning device away from the walking mechanism 1 can be controlled, so that the two pipes are coaxial; the pipe away from the walking mechanism 1 contacts the ball 2-9, so that it can move axially to approach the gap setting needle 3-6 until it contacts the gap setting needle 3-6, which can avoid repeated adjustment of the hoisted pipe, save time, and greatly improve the working efficiency of pipe butt-jointing; the side of the inner centering device 2 away from the walking mechanism 1 is provided with a guide cover 4, which facilitates walking along the curved pipe; the guide cover 4 comprises arc-shaped elastic sheets 4-1 arranged at intervals along the ring direction, and the inner side of the arc-shaped elastic sheet 4-1 is fastened and connected to the inner centering device 2 through a support 4-2, which can deform along the inner wall of the pipe when passing through the bend, avoiding damage to the inner wall of the pipe by the guide cover 4; the walking mechanism 1 is provided with a lifting plate 5 at a position close to the inner centering device 2 at the top, and the lifting plate 5 is provided with a plurality of lifting holes at intervals along the length direction of the walking mechanism 1, which facilitates the lifting of the walking mechanism 1 and the operation of the walking mechanism 1 in and out of the pipe; the telescopic cylinder I 2-3 and the telescopic cylinder II 3-1 are both hydraulic telescopic cylinders.

[0037] The present application is not limited to the details of the foregoing exemplary embodiments and can be practiced with modification and alteration within the scope of the appended claims. Thus, the application is not to be limited to the details shown, as particularly provided in the above description, as these could vary in many ways.

Claims

1. An internal aligning device capable of setting the width of a weld, comprising a walking mechanism (1) and an internal centering device (2), one end of the internal centering device (2) being provided with the walking mechanism (1) for driving it to walk along a pipeline; characterized in that: it further comprises a weld width setting mechanism (3); the internal centering device (2) comprises a shell (2-1) and a tensioning device, both ends of the shell (2-1) being provided with the tensioning device; the weld width setting mechanism (3) comprises telescopic cylinders II (3-1), the shell (2-1) being provided with a plurality of telescopic cylinders II (3-1) at positions corresponding to the intervals between the two tensioning devices, the telescopic rods of the telescopic cylinders II (3-1) facing the outside of the shell, the extending end of the telescopic rod being provided with a groove, a weld setting block (3-2) being slidingly fitted in the groove, a spring (3-3) being provided between the weld setting block (3-2) and the groove bottom, the groove bottom being provided with a contact switch (3-4) at a position corresponding to the center of the spring (3-3), a limiting step being provided in the groove for limiting the weld setting block (3-2) from continuing to move downward after the contact switch (3-4) is triggered by the weld setting block (3-2), a cap (3-5) being mounted on the extending end of the telescopic rod for preventing the weld setting block (3-2) from falling out; one end of the weld setting block (3-2) away from the telescopic cylinder II (3-1) being provided with a tapered weld setting needle (3-6); in use, the internal centering device (2) is pushed to the pipeline opening by the walking mechanism (1), which ensures that the weld width setting mechanism (3) completely extends out of the pipeline opening, the telescopic cylinder II (3-1) is controlled to elongate, and the weld setting block (3-2) drives the weld setting needle (3-6) to expand radially; then the internal centering device (2) is pulled close to the pipeline opening by the walking mechanism (1) until the needle body of the weld setting needle (3-6) contacts the pipeline opening; the tensioning device close to the walking mechanism (1) is controlled to expand radially, so that the internal centering device (2) is coaxial with the pipeline and achieves the purpose of axial positioning; then the other pipeline can be hoisted, the pipeline is sleeved into the internal centering device (2), and the pipeline is kept coaxial with the internal centering device (2) as much as possible, and the pipeline opening contacts the needle body of the weld setting needle (3-6), which can ensure that the two pipeline openings have a proper weld width.

2. The internal aligning device capable of setting the width of a weld according to claim 1, characterized in that: ​ The tensioning device comprises a fixed frame (2-2), a telescopic cylinder I (2-3) and a tensioning shoe (2-4), the outer edge of the fixed frame (2-2) is coaxially fastened to the shell (2-1), a protruding part is arranged at the center position of the fixed frame (2-2) and faces the outside of the shell (2-1), the telescopic cylinder I (2-3) is arranged at the protruding part and faces the inside of the shell (2-1), the telescopic cylinder I (2-3) is coaxial with the shell (2-1), and the connecting disc (2-5) is coaxially fastened to the telescopic cylinder I (2-3) at the extension end; a plurality of sliding holes (2-6) are uniformly and interval arranged at the outer edge of the fixed frame (2-2), the sliding rods (2-7) are slidably arranged in the sliding holes (2-6) and extend out of the sliding holes (2-6) at both ends, the tensioning shoe (2-4) is arranged at one end of the sliding rod (2-7) extending out of the fixed frame (2-2), the connecting rod (2-8) is hingedly arranged at the other end of the sliding rod (2-7), and the other end of the connecting rod (2-8) is hingedly connected to the outer edge of the connecting disc (2-5).

3. The self-adjusting width internal beak of claim 2, wherein the distal end of the beak is curved. 3 The four corner ends of the top of the tensioning shoe (2-4) of the walking mechanism (1) are embedded with the rolling balls (2-9), and the rolling balls (2-9) are in rolling connection with the tensioning shoe (2-4).

4. The internal aligning device capable of adjusting the seam width according to claim 1, wherein: The seam fixing needle (3-6) is in threaded connection with the seam fixing block (3-2).

5. The internal aligning device capable of adjusting the seam width according to claim 1, wherein: The side of the internal centering device (2) away from the walking mechanism (1) is provided with the guide cover (4).

6. The internal aligning device capable of adjusting the seam width according to claim 5, wherein: The guide cover (4) comprises the arc-shaped elastic sheets (4-1) which are arranged at intervals along the circumferential direction, and the inner side of the arc-shaped elastic sheets (4-1) is in fast connection with the internal centering device (2) through the support (4-2).

7. The internal aligning device capable of adjusting the seam width according to claim 1, wherein: The top of the walking mechanism (1) is provided with the hanging plate (5) near the internal centering device (2), and the hanging plate (5) is provided with a plurality of hanging holes at intervals along the length direction of the walking mechanism (1).

8. The internal aligning device capable of adjusting the seam width according to claim 2, wherein: Both the telescopic cylinder I (2-3) and the telescopic cylinder II (3-1) are hydraulic telescopic cylinders.

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