A method for correcting butt joint of large pipe before welding

Abstract

The present application relates to the field of coaxial butt joint in pipe welding, and discloses a correction butt joint method before large pipe welding, step one: the pipe to be welded is moved to between two groups of butt joint auxiliary devices; step two: the clamping correction mechanism is inserted into the pipe; step three: the clamping correction assembly clamps the pipe coaxially and self-centers; step four: among the two groups of clamping correction members, one group clamps the pipe wall, and the other group is switched to the correction state to correct the recess on the surface of the pipe, so that the recess correction on the surface of the pipe is realized without dead angle, and then the two groups of clamping correction members are kept in the clamping state; step five: the two groups of mounting seats are close to each other, the two pipes are close to each other, then the feeding mechanism drags the clamping correction mechanism and the pipe to move, and the two pipes finally complete the coaxial butt joint.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe welding, in particular to the field of coaxial butt joint in pipe welding, and specifically to a correction butt joint method before large pipe welding. BACKGROUND

[0002] Large round pipes are widely used, and are widely used as pipelines, outer shells, etc. in water supply, drainage, heat supply, coal gas supply, long-distance transportation of oil and natural gas, agricultural irrigation, hydraulic engineering and various industrial devices. When welding large pipes, the pipes are generally placed on the ground / welding table or lifted by a small lifting device to make the ends of the two pipes coaxially butt joint and then weld the joint. 1. If the pipe is a thin-walled metal pipe, the pipe will be deformed whether it is placed on the ground / welding table or lifted, which seriously affects the coaxial butt joint between the two pipes. 2. During transportation or storage, the surface of the pipe may be concave, which may affect the welding if the concave part is at the metal end. 3. Whether the pipe is placed on the ground / welding table or lifted, the butt joint of the two pipes is difficult and inconvenient, and the weld a on the two pipes cannot coincide, otherwise it will affect the welding between the two pipes. If the weld a coincides, the pipe needs to be moved, which is not convenient and increases the difficulty of clamping the pipe before welding. Weld a refers to the weld during pipe forming.

[0003] The applicant has found, through a search, a Chinese utility model patent with the publication number CN206952470U, which discloses a pipe welding righting device for construction, and which states that the width of the weld and the coaxiality of the pipe are strictly required during welding of large pipes. The traditional welding process is performed on the ground, and the pipe is kept stationary by its own weight. However, the width of the weld cannot be strictly controlled during welding, so the welding process of the welded pipe is poor, and problems such as leakage and fracture are likely to occur.

[0004] The applicant has found, through a search, a Chinese invention patent with the publication number CN109128677A, which discloses a surrounding welding device for large round pipes, and which states that it is inconvenient to move and position the large round pipes during welding and assembly, the concentricity is not high, and the weld is not neat.

[0005] The applicant finds, through retrieval, a Chinese invention patent with publication number CN114055068A, which discloses an adjusting structure and large pipe welding device, and records that: when large metal pipes are welded, a small lifting device is needed to lift the large pipes, so that the two pipe ends are overlapped and then welded. Since the large metal pipes cannot be stably positioned when being lifted, the pipe joints move when being welded, causing misalignment of the pipes, which reduces the quality of pipe welding and increases the difficulty of pipe welding.

[0006] The applicant finds, through retrieval, a Chinese invention patent with publication number CN113118245A, which discloses a metal thin-walled pipe surface depression quick correction and repair, and records that: metal thin-walled pipes are poor in rigidity and weak in strength, and are prone to deformation during processing and transportation. Thin-walled pipes will inevitably collide during transportation, and will be deformed after collision, affecting the use value and the functions that can be achieved.

[0007] Therefore, as can be seen from the above patent documents, the problems of pipe deformation, depression, and inconvenience of movement during the coaxial butt joint of two groups of large pipes before welding are real, based on which the present application proposes a correction butt joint method before welding of large pipes. SUMMARY

[0008] To solve the problems mentioned in the above background, the present application provides a correction butt joint method before welding of large pipes.

[0009] To achieve the above technical purposes, the technical solutions adopted by the present application are as follows.

[0010] A correction butt joint method before welding of large pipes, which comprises a base, two groups of mounting seats are installed on the base, the mounting seats can move, an butt joint auxiliary device is arranged on each mounting seat, the butt joint auxiliary device comprises a mounting mechanism, a feeding mechanism is installed on the mounting mechanism, the feeding mechanisms in the two groups of butt joint auxiliary devices are provided with clamping correction mechanisms at one end facing each other, the mounting mechanism is used to pull the feeding mechanism and the clamping correction mechanism to move in the vertical direction, the feeding mechanism is used to pull the clamping correction mechanism and the pipe to move in the axial direction of the pipe, the clamping correction mechanism comprises two groups of clamping correction members, the clamping correction members have two states: a clamping state for clamping the pipe and a correction state for correcting the surface depression of the pipe, the clamping correction member comprises a driving assembly and a clamping correction assembly, the clamping correction assembly is used to clamp the pipe or correct the surface depression of the pipe, and the driving assembly is used to provide driving force for clamping or correction of the clamping correction assembly.

[0011] It comprises the following steps:

[0012] Step 1: Move the pipe fittings to be welded between the two sets of docking auxiliary devices using hoisting equipment;

[0013] Step 2: The feed mechanism pulls the clamping and correction mechanism to move, so that the clamping and correction mechanism extends into the pipe fitting;

[0014] Step 3: The drive component operates to drive the clamping and correction component to perform coaxial self-centering internal clamping of the pipe fitting. After clamping is completed, the hoisting equipment releases the pipe fitting and moves away.

[0015] Step 4: Of the two sets of clamping and correcting components, one set of clamping and correcting components keeps clamping the pipe wall, while the other set of clamping and correcting components releases its clamping on the pipe wall and switches to the correction state to correct the depressions on the pipe surface. Then, the clamping and correcting components in the correction state switch to the clamping state, and the clamping and correcting components in the clamping state switch to the correction state. In this way, the depression correction process on the pipe surface is carried out without dead angles. Then, both sets of clamping and correcting components keep clamping.

[0016] Step 5: The two sets of mounting seats move closer to each other, thereby bringing the two pipe fittings closer together. Then, the feeding mechanism pulls the clamping and correction mechanism and the pipe fittings to move, so that the two pipe fittings finally complete the coaxial docking.

[0017] Furthermore, the feeding mechanism includes a threaded column mounted on the mounting bracket. The threaded column is hollow inside and its axis is parallel to the direction of movement of the mounting base. The threaded column can move only along the axis or rotate only around the axis. The threaded column is divided into a threaded section and a smooth section along the axis. The threaded section is connected to the feeding mechanism, and the smooth section is used to install the clamping and correction mechanism.

[0018] Furthermore, in step five above, after the two pipe fittings are coaxially connected, the threaded column can rotate together with the clamping and correction mechanism and the pipe fittings it clamps, so that the weld seams a on the two pipe fittings are staggered. Weld seam a refers to the welding point during the pipe fitting processing.

[0019] Furthermore, the clamping and correction assembly includes a fixed frame and a clamping and correction unit. The fixed frame includes a collar that is coaxially rotatably sleeved on the outside of the smooth section of the threaded column. A crossbar extends from the end of the collar away from the threaded section of the threaded column. The clamping and correction unit includes a connecting frame. A connecting rod is hinged between the connecting frame and the crossbar. Two sets of connecting rods are arranged along the axial direction of the collar. A ring frame is slidably installed on the outside of the collar. A push-pull rod is hinged between the ring frame and the connecting rod.

[0020] Further, the correction frame is rotatably installed on the connecting frame, and the rotation shaft formed by the rotatable installation is axially parallel to the axial direction of the sleeve ring, the input end of the rotation shaft is power-connected with the motor 5 arranged on the connecting frame, the outer wall of the correction frame is arranged as a correction arc surface, the clamping wheel is rotatably installed on the correction frame, the axial direction of the clamping wheel is perpendicular to the axial direction of the rotation shaft, and the clamping wheel is arranged in multiple groups along the axial direction of the threaded column, the multiple groups of clamping wheels are power-connected with the motor 6 arranged on the connecting frame through the power transmission member, and the clamping correction units in each group of clamping correction members are arranged in multiple groups along the circumferential direction of the sleeve ring, and the multiple groups of clamping correction units in the two groups of clamping correction members are arranged in a staggered manner.

[0021] Further, in the clamping process of the above-mentioned step three:

[0022] S31: The driving assembly drives the clamping wheel to be close to the inner wall of the pipe and realizes the inner clamping of the pipe;

[0023] S32: The motor 6 is driven to rotate the clamping wheel, the clamping wheel rotates to drag the pipe to move along the axial direction, and then the parts of the clamping correction unit located on both sides of the center of the pipe are symmetrically arranged.

[0024] Further, the driving assembly comprises a motor frame arranged in the threaded column, the motor frame is provided with the motor 7 and the motor 8, the driving assembly further comprises an outer sleeve shell coaxially and rotatably sleeved outside the smooth section of the threaded column, the outer sleeve shell is fixedly connected with the sleeve ring, a lead screw one is arranged between the outer sleeve shell and the ring frame, the input end of the lead screw one extends into the outer sleeve shell, the lead screw one is screw-connected with the ring frame, the axial direction of the lead screw one is parallel to the axial direction of the threaded column, and the lead screw one is arranged in multiple groups along the circumferential direction of the threaded column, the input end of the lead screw one and the motor 7 are power-connected through the power connecting piece three, and the outer sleeve shell and the motor 8 are power-connected through the power connecting piece four.

[0025] Further, the butt joint auxiliary device further comprises a balancing member, the balancing member is correspondingly matched with the clamping correction mechanism and is located on both sides of the mounting mechanism respectively, and the balancing member is used for forming a gravity balance with the clamping correction mechanism.

[0026] Compared with the prior art, the present application has the beneficial effects that:

[0027] The core of the present application is that the pipe is clamped and centered coaxially by the clamping correction mechanism, the clamping correction mechanisms in the two groups of butt joint auxiliary devices are coaxially arranged, so that the two groups of pipes clamped are coaxially arranged, the clamping correction mechanism has two states: a clamping state and a correction state, the former clamps the pipe, and the latter can be used to correct the depression on the surface of the pipe.

[0028] In addition, in the scheme, the pipe fittings are clamped and can move axially and rotate around the axial direction, that is, the pipe fittings are clamped and moved more conveniently, and the staff can manually operate the control screen to fine-tune the position of the pipe fittings according to the actual cleaning, thereby improving the coaxial butt joint accuracy between the two pipe fittings;

[0029] In addition, in the scheme, the two pipe fittings are firmly and stably clamped, the clamped pipe fittings are suspended and have no external obstruction, which facilitates the subsequent welding process, and the rotation between the two pipe fittings during the welding process does not affect the coaxial butt joint, which is driven by the rotation of the threaded column, is conducive to the welding process, and the staff does not need to stand below the pipe fittings, and the safety is also guaranteed;

[0030] In addition, the pipe fittings are clamped by the clamping wheels in the clamping correction mechanism, and the clamping wheels can be driven to rotate and move the pipe fittings axially, which means that the pipe length specifications of the pipe fittings to be welded are different, and the pipe fittings with shorter pipe length do not need to use the clamping wheels close to the stand when clamped, but do not affect the clamping of the pipe fittings. The pipe fittings with longer pipe length are not completely distributed in the pipe fittings even if the clamping correction mechanism as a whole extends into the pipe fittings, and the position of the hoisting equipment when hoisting the pipe fittings between the two sets of butt joint auxiliary devices is deviated each time. In this case, the position of the clamping correction mechanism extending into the pipe fittings is also deviated each time, so the clamping wheels need to rotate to move the pipe fittings, and the parts of the clamping correction unit on both sides of the center of the pipe fittings are symmetrically arranged to improve the clamping stability.

[0031] In addition, in the scheme, the butt joint auxiliary devices can be driven to move by the cooperation of the rack and pinion, and the threaded column can also move, and the two cooperate to provide a larger space for the pipe fittings in a smaller area.

[0032] In addition, in the scheme, a balance member is also provided to balance the gravity on both sides of the stand. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The schematic view of the two sets of pipe fittings is shown in the figure.

[0034] Figure 2 The schematic view of the base and the mounting seat is shown in the figure.

[0035] Figure 3 The schematic view of the butt joint auxiliary device clamping the pipe fittings is shown in the figure.

[0036] Figure 4 The schematic view of the butt joint auxiliary device is shown in the figure.

[0037] Figure 5Schematic diagram of the balancing member and the mounting mechanism and the threaded column;

[0038] Figure 6 Schematic diagram of the feeding member;

[0039] Figure 7 Schematic diagram of the clamping correction mechanism and the threaded column;

[0040] Figure 8 Schematic diagram of two sets of clamping correction assemblies in the same group of clamping correction mechanisms;

[0041] Figure 9 Exploded view of two sets of clamping correction assemblies in the same group of clamping correction mechanisms;

[0042] Figure 10 Side view of two sets of clamping correction assemblies in the same group of clamping correction mechanisms;

[0043] Figure 11 Schematic diagram of the fixing frame, the ring frame, the connecting rod, and the push-pull rod;

[0044] Figure 12 Exploded view of the clamping correction unit;

[0045] Figure 13 Exploded view of the correction frame and the clamping wheel;

[0046] Figure 14 Schematic diagram of the driving assembly Figure 1 ;

[0047] Figure 15 Schematic diagram of the driving assembly Figure 2 ;

[0048] Figure 16 Partial schematic diagram of the driving assembly Figure 1 ;

[0049] Figure 17 Partial schematic diagram of the driving assembly Figure 2 .

[0050] The reference signs in the drawings are:

[0051] 100, base; 101, mounting seat; 102, motor one;

[0052] 200, docking auxiliary device;

[0053] 300, mounting mechanism; 301, stand; 302, linear module; 303, motor two; 304, mounting frame;

[0054] 400, feeding mechanism; 401, threaded column; 402, motor three; 403, motor four; 404, power connecting piece one; 405, power connecting piece two;

[0055] 500. Clamping and correction mechanism; 501. Drive assembly; 502. Clamping and correction assembly; 503. Fixing frame; 504. Clamping and correction unit; 505. Collar; 506. Cross frame; 507. Connecting rod; 508. Ring frame; 509. Push-pull rod; 510. Connecting frame; 511. Motor 5; 512. Motor 6; 513. Correction frame; 514. Clamping wheel; 515. Rotating shaft; 516. Power transmission component; 517. Outer shell; 518. Lead screw 1; 519. Bracket; 520. Power connector 3; 521. Power connector 4; 522. Motor 7; 523. Motor 8;

[0056] 600. Balancing component; 601. Balancing frame; 602. Carriage; 603. Counterweight; 604. Connecting rope; 605. Spring. Detailed Implementation

[0057] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0058] like Figures 1-17 As shown, a calibration and docking device for welding large pipe fittings includes a base 100, on which two sets of mounting seats 101 are installed. Each mounting seat 101 is movable. Specifically, the base 100 is equipped with parallel slide rails and racks. The mounting seats 101 and slide rails are in sliding engagement. A motor 102 is installed on the mounting seat 101. The output end of the motor 102 is equipped with a gear that meshes with the rack. The operation of the motor 102 drives the mounting seats 101 to move along the guide direction of the slide rails through the engagement of the gear and rack.

[0059] Each mounting base 101 is equipped with a docking auxiliary device 200. The docking auxiliary device 200 is used to clamp the pipe fitting to be welded in an internal clamping manner and pull the pipe fitting to move along the axial direction. In addition, the docking auxiliary device 200 can also correct the surface depression of the pipe fitting during the clamping process.

[0060] This solution is for large circular pipe fittings. Large circular pipe fittings are generally made by rolling metal sheets into a circular tube, and then using welding technology to weld the two ends of the sheet together to form a circular pipe fitting. This weld is called weld a.

[0061] like Figure 4As shown, the butt joint auxiliary device 200 comprises a mounting mechanism 300, a feeding mechanism 400 is mounted on the mounting mechanism 300, and the feeding mechanisms 400 of the two groups of butt joint auxiliary devices 200 are provided with clamping and correcting mechanisms 500 at one end facing each other, wherein the mounting mechanism 300 is used to drive the feeding mechanism 400 and the clamping and correcting mechanism 500 to move in the vertical direction, the feeding mechanism 400 is used to drive the clamping and correcting mechanism 500 and the pipe to move in the axial direction of the pipe, and the clamping and correcting mechanism 500 is used to switch between clamping the pipe and correcting the surface depression of the pipe.

[0062] As shown in the Figure 5 The mounting mechanism 300 comprises a stand 301 provided on the mounting seat 101, a mounting frame 304 is slidingly mounted on the stand 301 in the vertical direction, and a linear module 302 for driving the mounting frame 304 to move in the vertical direction is further provided. Specifically, the linear module 302 comprises a second screw rod 302 installed vertically on the mounting frame 304 and a second motor 303 in power connection with the second screw rod 302, the second screw rod 302 is in threaded connection with the mounting frame 304, and the second motor 303 is used to drive the second screw rod 302 to rotate, thereby driving the mounting frame 304 to move in the vertical direction.

[0063] As shown in the Figure 5 And Figure 6 The feeding mechanism 400 comprises a threaded column 401 mounted on the mounting frame 304, and the threaded column 401 is hollow inside and axially parallel to the movement direction of the mounting seat 101, i.e. parallel to the extension direction of the rack.

[0064] The mounting frame 304 is provided with a third motor 402 and a fourth motor 403, wherein the fourth motor 403 is provided with a power connecting piece one 404 between the fourth motor 403 and the threaded column 401, the driving part of the power connecting piece one 404 is mounted on the output end of the fourth motor 403, the driven part is in threaded connection with the outside of the threaded column 401 and is limited to only rotate by the mounting frame 304, the third motor 402 is provided with a power connecting piece two 405 between the third motor 402 and the threaded column 401, the driving part of the power connecting piece two 405 is mounted on the output end of the third motor 402, the driven part is mounted on the outside of the threaded column 401 through a guide piece and is limited to only rotate by the mounting frame 304, and the guide piece comprises a guide groove provided on the outer wall of the threaded column 401 in the axial direction of the threaded column 401 and a guide protrusion provided on the driven part, the guide protrusion and the guide groove are in sliding fit.

[0065] When motor 403 is running while motor 3 402 is not running, threaded column 401 only moves axially. When motor 3 402 and motor 403 run together, the former drives threaded column 401 to rotate and move at the same speed, while the latter drives threaded column 401 to move. The movement of threaded column 401 in the former and the movement of threaded column 401 in the latter are at the same speed and in opposite directions, thus canceling each other out. Therefore, threaded column 401 only rotates axially. The movement and rotation of threaded column 401 moves and rotates together with docking auxiliary device 200 and the pipe fittings clamped by it.

[0066] like Figure 5 As shown, the threaded column 401 is divided into a threaded section and a smooth section along the axial direction. The threaded section is connected to the feed mechanism 400, and the smooth section is used to install the clamping and correction mechanism 500.

[0067] like Figures 7-10 As shown, the clamping and correction mechanism 500 includes two sets of clamping and correction components, which are configured in two states: a clamping state for clamping the pipe fitting and a correction state for correcting the surface depression of the pipe fitting.

[0068] The clamping and correction component includes a drive assembly 501 and a clamping and correction assembly 502. The clamping and correction assembly 502 is used to clamp the pipe fitting or correct the surface depression of the pipe fitting, and the drive assembly 501 is used to provide driving force for the clamping or correction of the clamping and correction assembly 502.

[0069] like Figure 8 As shown, the clamping and correction assembly 502 includes a fixing frame 503 and a clamping and correction unit 504.

[0070] like Figure 11 and Figure 12 As shown, the fixing frame 503 includes a collar 505 coaxially rotatably sleeved on the outside of the smooth section of the threaded column 401. A crossbar 506 extends from one end of the collar 505 away from the threaded section of the threaded column 401. The clamping and correction unit 504 includes a connecting frame 510. A connecting rod 507 is hinged between the connecting frame 510 and the crossbar 506. Two sets of connecting rods 507 are arranged along the axial direction of the collar 505.

[0071] A ring frame 508 is slidably mounted on the outside of the collar 505. A push-pull rod 509 is hinged between the ring frame 508 and the connecting rod 507. When the ring frame 508 moves toward the threaded section of the threaded post 401, the push-pull rod 509 pulls the connecting rod 507 to deflect, thereby causing the connecting frame 510 to move away from the cross frame 506. Conversely, when the ring frame 508 moves away from the threaded section of the threaded post 401, the push-pull rod 509 pushes the connecting rod 507 to deflect, thereby causing the connecting frame 510 to move closer to the cross frame 506.

[0072] like Figure 12 and Figure 13As shown, the correction frame 513 is rotatably mounted on the connecting frame 510, and the rotation axis of the correction frame 513 is parallel to the axial direction of the sleeve 505. The input end of the rotation axis 515 is connected to the motor 511, and the outer wall of the correction frame 513 is arc-shaped.

[0073] The clamping wheel 514 is rotatably mounted on the correction frame 513, and the axial direction of the clamping wheel 514 is perpendicular to the axial direction of the rotation axis 515. A plurality of clamping wheels 514 are arranged along the axial direction of the threaded column 401. The plurality of clamping wheels 514 are connected to the motor 512 through the power transmission member 516.

[0074] As shown in the figure, Figure 9 As shown in the figure, Figure 10 Each clamping and correcting unit 504 in each clamping and correcting mechanism is arranged in multiple groups along the circumferential direction of the sleeve 505, and the multiple groups of clamping and correcting units 504 in the two clamping and correcting mechanisms are arranged alternately. Figure 10 As shown in the figure,

[0075] The motor 511 drives the rotation of the rotation axis 515 and the correction frame 513, so as to determine whether the correction arc surface is opposite to the inner wall of the pipe or the clamping wheel 514 is opposite to the inner wall of the pipe.

[0076] The large pipe is lifted by the small lifting device to the space between the two clamping and correcting mechanisms, and then the threaded column 401 only moves along the axial direction, so that the clamping and correcting mechanism 500 extends into the pipe. Then, the clamping wheels 514 in the two clamping and correcting mechanisms are opposite to the inner wall of the pipe. Then, the driving assembly 501 drives the ring frame 508 to move towards the threaded section of the threaded column 401, and the connecting rod 507 is pulled by the push-pull rod 509 to deflect, so that the connecting frame 510 moves away from the horizontal frame 506, that is, the clamping and correcting unit 504 moves towards the inner wall of the pipe. The clamping wheels 514 cooperate to clamp the pipe in a self-centering manner. After clamping, the small lifting device releases the pipe and leaves. At this time, the motor 512 drives the clamping wheels 514 to rotate at the same speed and in the same direction through the power transmission member 516, so as to drive the pipe to move along the axial direction, and realize the coaxial connection between the two pipes.

[0077] If the pipe surface has a depression, one of the two sets of clamping correction members keeps clamping the pipe wall, and the other set of clamping correction members loosens the clamping of the pipe wall and makes the correction cam surface face the inner wall of the pipe. Then, the driving assembly 501 in the loosened clamping correction member drives the clamping correction unit 504 to move towards the inner wall of the pipe again, so that the correction surface is in contact with the inner wall of the pipe. Since the multiple sets of clamping correction units 504 in the clamping correction member move synchronously at the same speed and in the same direction in this scheme, i.e., the state of keeping coaxial with the threaded column 401 is diffused and moved to the four directions, and the pipe is clamped and arranged coaxially with the threaded column 401, so the depression on the surface of the pipe can be pushed and repaired by the correction cam surface. In addition, since the correction cam surface is in line contact with the inner wall of the pipe, the driving assembly 501 drives the fixed frame 503 to rotate, i.e., drives the clamping correction assembly 502 to rotate as a whole, and the rotation displacement is equal to the distance between the clamping correction units 504 in the two sets of clamping correction members. Next, the set of clamping correction members is switched to clamp the pipe wall again, and the clamping correction members that clamp the pipe wall are switched to correct. The two cooperate to make the correction surface rotate one circle (one circle here is realized by multiple correction surfaces), realize the correction of the depression on the surface of the pipe, and improve the clamping stability after the correction is completed.

[0078] As shown in Figures 14-17 , the driving assembly 501 includes a motor frame arranged inside the threaded column 401, and a motor seven 522 and a motor eight 523 are installed on the motor frame.

[0079] The driving assembly 501 further includes an outer sleeve 517 coaxially and rotatably arranged outside the smooth section of the threaded column 401. The outer sleeve 517 is fixedly connected with the sleeve ring 505, and a lead screw one 518 is arranged between the outer sleeve 517 and the ring frame 508. The input end of the lead screw one 518 extends into the outer sleeve 517, and the lead screw one 518 is threadedly connected with the ring frame 508. The axial direction of the lead screw one 518 is parallel to the axial direction of the threaded column 401, and multiple sets of the lead screw one 518 are arranged along the circumferential direction of the threaded column 401. The ring frame 508 is driven to move by the rotation of the lead screw one 518.

[0080] The input end of the lead screw one 518 is connected with the motor seven 522 through a power connecting piece three 520, and the outer sleeve 517 is connected with the motor eight 523 through a power connecting piece four 521. The outer sleeve 517 further comprises a support 519 for mounting the power connecting piece three 520 and the power connecting piece four 521. In this scheme, the power connecting pieces one, two, three and four and the power transmission piece 516 are all conventional technical means in the existing power transmission route, which can be realized. In this scheme, they are shown in the drawings, and will not be described again.

[0081] The motor seven 522 drives the rotation of the screw rod one 518, and then the movement of the ring frame 508, so that the clamping and correcting unit 504 moves, and then the self-centering clamping or loosening of the pipe is realized; in addition, the motor eight 523 drives the rotation of the outer sleeve 517, and the outer sleeve 517 rotates with the sleeve ring 505, and then rotates with the clamping and correcting assembly 502, and cooperates with the clamping and correcting assembly 502 in the correction to correct the concave surface of the pipe.

[0082] The preferred embodiment is as shown in Figure 3 With Figure 4 As shown, the whole docking auxiliary device 200 is arranged on the smooth section of the threaded column 401, which causes imbalance, and the threaded column 401 is heavy on one end and light on the other end, which is not conducive to use. Therefore, the docking auxiliary device 200 further comprises a balancing member 600.

[0083] Specifically, as shown in Figure 4 With Figure 5 The balancing member 600 comprises a balancing frame 601 which is slidably connected with the stand 301 in the vertical direction, and the balancing frame 601 and the clamping and correcting mechanism 500 are respectively located on both sides of the stand 301, and the threaded section of the threaded column 401 is provided with a support frame which is in sliding fit with the balancing frame 601 in the axial direction of the threaded column 401.

[0084] The balancing frame 601 is slidably installed on the sliding frame 602 in the axial direction of the threaded column 401, and the suspended end of the sliding frame 602 is provided with a support sleeve which is coaxially sleeved on the outside of the outer sleeve 517 or the smooth section of the threaded column 401, so as to support the smooth section of the threaded column 401, and when the threaded column 401 moves, the support sleeve moves with the sliding frame 602.

[0085] A counterweight 603 is slidably mounted on the balance frame 601 along the axial direction of the threaded column 401. A spring 605 is also mounted on the balance frame 601, with its free end connected to the counterweight 603. The spring 605 is used to pull the counterweight 603 to move closer to the upright frame 301. A pulley is also provided on the balance frame 601. A connecting rope 604 is provided between the balance frame 601 and the slide 602. One end of the connecting rope 604 is connected to the slide 602, and the other end passes around the pulley and is connected to the counterweight 603. The threaded columns 401 in the two sets of docking auxiliary devices 200 are mutually abutted. When the two pipe fittings are moved, the slide 602 moves together with the threaded column 401 and pulls the counterweight 603 away from the upright 301 via the connecting rope 604. In other words, during the docking of the two pipe fittings, the docking auxiliary device 200 moves away from the upright 301, and the counterweight 603 also moves away from the upright 301. After the welding is completed, when the docking auxiliary device 200 returns to its original position and approaches the upright 301, the counterweight 603 also approaches the upright 301. Since the counterweight 603 and the docking auxiliary device 200 are located on opposite sides of the upright 301, balance is achieved, which is beneficial to the use of this equipment.

[0086] Working principle of the invention:

[0087] First: The pipe fittings to be welded are moved between the two sets of docking auxiliary devices 200 using hoisting equipment;

[0088] Then: the threaded column 401 moves only along the axial direction, causing the clamping and correction mechanism 500 to extend into the pipe fitting;

[0089] Then: make the clamping wheels 514 in both sets of clamping and correcting components face the inner wall of the pipe fitting, drive component 501 drives ring frame 508 to move toward the threaded section of threaded column 401, pulls connecting rod 507 to deflect through push-pull rod 509, thereby making connecting frame 510 move away from cross frame 506, so that clamping and correcting unit 504 moves toward the inner wall of the pipe fitting as a whole, and several clamping wheels 514 cooperate to clamp the pipe fitting in a self-centering internal clamping manner. After clamping is completed, small lifting device releases pipe fitting and leaves.

[0090] If there is a depression on the pipe fitting surface, one set of clamping and correcting components will hold the pipe wall, while the other set will release the clamping of the pipe wall and make the correcting arc surface face the inner wall of the pipe fitting. Then, the drive component 501 in the released clamping and correcting component will drive the clamping and correcting unit 504 to move toward the inner wall of the pipe fitting, so that the correcting surface contacts the inner wall of the pipe fitting. The correction arc surface will push and repair the depression on the pipe fitting surface. Then, the drive component 501 will drive the fixing frame 503 to rotate, that is, drive the clamping and correcting component 502 to rotate as a whole. The rotation displacement is equal to the distance between the clamping and correcting units 504 in the two sets of clamping and correcting components. Next, the clamping and correcting component will switch back to clamping the pipe wall, while the clamping and correcting component that previously clamped the pipe wall will switch to correction. The two will work together to make the correction surface rotate one revolution, thereby correcting the depression on the pipe fitting surface. After the correction is completed, both sets of clamping and correcting components will switch back to clamping the pipe fitting.

[0091] Then: Motor 6 512 drives clamping wheel 514 to rotate at the same speed and in the same direction through power transmission component 516, which can drive the two pipes to move closer to each other along the axial direction, realizing coaxial docking between the two pipes.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for alignment and connection of large pipe fittings before welding, comprising a base (100), two sets of mounting seats (101) mounted on the base (100), the mounting seats (101) being movable, characterized in that: Each set of mounting bases (101) is equipped with a docking auxiliary device (200). The docking auxiliary device (200) includes a mounting mechanism (300), and a feeding mechanism (400) is mounted on the mounting mechanism (300). The feeding mechanisms (400) of the two sets of docking auxiliary devices (200) are equipped with a clamping and correction mechanism (500) at their opposite ends. The mounting mechanism (300) is used to pull the feeding mechanism (400) and the clamping and correction mechanism (500) to move in the vertical direction. The feeding mechanism (400) is used to pull the clamping mechanism. The clamping and correction mechanism (500) moves along the pipe fitting axially. The clamping and correction mechanism (500) includes two sets of clamping and correction components. The clamping and correction components are set in two states: clamping state of clamping pipe fitting and correction state of correcting surface depression of pipe fitting. The clamping and correction components include a drive assembly (501) and a clamping and correction assembly (502). The clamping and correction assembly (502) is used to clamp pipe fitting or correct surface depression of pipe fitting. The drive assembly (501) is used to provide driving force for clamping or correction of the clamping and correction assembly (502). It includes the following steps: Step 1: Move the pipe fittings to be welded between the two sets of docking auxiliary devices (200) using hoisting equipment; Step 2: The feed mechanism (400) pulls the clamping and correction mechanism (500) to move, so that the clamping and correction mechanism (500) extends into the pipe fitting; Step 3: The drive assembly (501) drives the clamping and correction assembly (502) to perform coaxial self-centering internal clamping on the pipe fitting. After clamping is completed, the hoisting equipment releases the pipe fitting and leaves. Step 4: Of the two sets of clamping and correcting components, one set of clamping and correcting components keeps clamping the pipe wall, while the other set of clamping and correcting components releases its clamping on the pipe wall and switches to the correction state to correct the depressions on the pipe surface. Then, the clamping and correcting components in the correction state switch to the clamping state, and the clamping and correcting components in the clamping state switch to the correction state. In this way, the depression correction process on the pipe surface is carried out without dead angles. Then, both sets of clamping and correcting components keep clamping. Step 5: The two sets of mounting seats (101) move closer to each other, thereby bringing the two pipe fittings closer to each other. Then, the feeding mechanism (400) pulls the clamping and correction mechanism (500) and the pipe fittings to move, so that the two pipe fittings finally complete the coaxial docking. The feed mechanism (400) includes a threaded post (401) mounted on a mounting bracket (304). The threaded post (401) is hollow inside and its axis is parallel to the direction of movement of the mounting base (101). The threaded post (401) can move only along the axis or rotate only about the axis. The threaded post (401) is divided into a threaded section and a smooth section along the axis. The threaded section is connected to the feed mechanism (400), and the smooth section is used to install the clamping and correction mechanism (500). The clamping and correction assembly (502) includes a fixed frame (503) and a clamping and correction unit (504). The fixed frame (503) includes a collar (505) that is coaxially rotatably sleeved on the outside of the smooth section of the threaded column (401). A crossbar (506) extends from one end of the collar (505) away from the threaded section of the threaded column (401). The clamping and correction unit (504) includes a connecting frame (510). A connecting rod (507) is hinged between the connecting frame (510) and the crossbar (506). Two sets of connecting rods (507) are arranged along the axial direction of the collar (505). A ring frame (508) is slidably installed on the outside of the collar (505). A push-pull rod (509) is hinged between the ring frame (508) and the connecting rod (507). A correction frame (513) is rotatably mounted on the connecting frame (510), and the axial direction of the rotating shaft (515) formed at the rotatable mounting point is parallel to the axial direction of the collar (505). The input end of the rotating shaft (515) is powered by a motor (511) mounted on the connecting frame (510). The outer wall of the correction frame (513) is set as a correction arc surface. A clamping wheel (514) is rotatably mounted on the correction frame (513), and the axial direction of the clamping wheel (514) is perpendicular to the rotating shaft (515). The clamping wheels (514) are arranged in multiple sets along the axial direction of the threaded column (401). The multiple sets of clamping wheels (514) are connected to the motor six (512) on the connecting frame (510) through the power transmission component (516). The clamping correction units (504) in each set of clamping correction components are arranged in multiple sets along the circumferential direction of the collar (505), and the multiple sets of clamping correction units (504) in the two sets of clamping correction components are arranged in a staggered manner.

2. The method for alignment and connection of large pipe fittings before welding according to claim 1, characterized in that: In step five above, after the two pipe fittings are coaxially connected, they can be rotated together by the threaded column (401) to pull and clamp the correction mechanism (500) and the pipe fittings clamped by it, so that the weld seams a on the two pipe fittings are staggered. Weld seam a refers to the welding point during the pipe fitting processing.

3. The method for alignment and connection of large pipe fittings before welding according to claim 1, characterized in that: During the clamping process in step three above: S31: The drive assembly (501) drives the clamping wheel (514) to approach the inner wall of the pipe and achieves internal clamping of the pipe; S32: The operation of motor six (512) drives the clamping wheel (514) to rotate. The rotation of the clamping wheel (514) pulls the pipe to move along the axial direction, thereby making the clamping correction unit (504) located on both sides of the center of the pipe symmetrically arranged.

4. The method for alignment and connection of large pipe fittings before welding according to claim 1, characterized in that: The drive assembly (501) includes a motor frame disposed inside the threaded column (401), on which motor seven (522) and motor eight (523) are mounted. The drive assembly (501) also includes an outer shell (517) coaxially rotatably sleeved outside the smooth section of the threaded column (401). The outer shell (517) is fixedly connected to the collar (505). A lead screw (518) is disposed between the outer shell (517) and the ring frame (508). The input end of the lead screw (518) extends into the outer shell. Inside 517), lead screw 1 (518) is threadedly connected to ring frame (508). The axial direction of lead screw 1 (518) is parallel to the axial direction of thread column (401), and multiple sets of lead screw 1 (518) are arranged in an array along the circumferential direction of thread column (401). The input end of lead screw 1 (518) is connected to motor 7 (522) through power connector 3 (520). The outer shell (517) is connected to motor 8 (523) through power connector 4 (521).

5. The method for alignment and connection of large pipe fittings before welding according to claim 1, characterized in that: The docking auxiliary device (200) also includes a balancing component (600), which corresponds to and matches the clamping and correction mechanism (500) and is located on both sides of the mounting mechanism (300). The balancing component (600) is used to form a gravity balance with the clamping and correction mechanism (500).

Images