Positioning device and welding system for inner ring seam welding

Abstract

The present invention discloses a positioning device and welding system for inner ring seam welding, wherein the positioning device includes a rotatable support platform, a clamping mechanism arranged above the support platform, and a driving mechanism for driving the clamping mechanism to move closer to or away from the support platform. The clamping mechanism has a clamping bracket and a clamping member rotatably mounted on the clamping bracket; the clamping member is connected to the clamping bracket through a bearing; the clamping member is provided with a clamping portion for abutting against one end of the workpiece to be welded. The clamping member is provided with a welding gun through-hole that passes through the clamping member in the axial direction; the clamping bracket is provided with a support bracket through-hole that is in communication with the welding gun through-hole. Compared with the prior art, the present invention rotates the workpiece to be welded on the support platform and presses the workpiece to be welded downward by a clamping member that rotates synchronously with the support platform above the workpiece to be welded to achieve axial stability of the workpiece to be welded, thereby ensuring the stability of the positioning of the workpiece to be welded during welding.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, in particular to a positioning device and a welding system for inner annular seam welding. Background Art

[0002] A submersible pump is a water-lifting device in which the motor and water pump are submerged in water. It has the advantages of simple structure, energy saving and high efficiency, low noise, safe and reliable operation, and easy installation and maintenance. It can be used in a variety of water-lifting occasions and has huge market demand.

[0003] During the production process of submersible pumps, the outer casing and flanges at each end are typically welded together. Because the weld between the outer casing and flange is an annular gap and located on the inside of the outer casing, welding is more difficult than conventional methods where the weld is located on the outside of the outer casing. This is particularly true because the outer casing and flange must be rotated synchronously during the welding process. This requires ensuring stability between the two, thus necessitating effective positioning of both.

[0004] In the prior art, manual positioning, clamping and welding of the submersible pump casing and flanges at both ends are often used. Manual positioning welding not only causes inconvenience and poor positioning effect, thus affecting welding quality, but also has the problem of low welding efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a positioning device for inner girth welding to solve the deficiencies in the prior art, which can conveniently realize the positioning and support of the workpiece to be welded.

[0006] The present invention provides a positioning device for inner annular seam welding, comprising a rotatable support platform, a clamping mechanism arranged above the support platform, and a driving mechanism for driving the clamping mechanism to move closer to or away from the support platform;

[0007] The clamping mechanism comprises a clamping bracket and a clamping member rotatably mounted on the clamping bracket; an end of the clamping member away from the support platform is connected to the clamping bracket via a bearing; an end of the clamping member close to the support platform is provided with a clamping portion for abutting against one end of a workpiece to be welded;

[0008] The pressing piece is provided with a welding gun through-hole penetrating along the axial direction of the pressing piece; the pressing bracket is provided with a support bracket through-hole communicating with the welding gun through-hole.

[0009] Furthermore, the clamping bracket has an annular support plate coaxially arranged with the clamping member and a retaining ring arranged on the annular support plate away from one end of the support platform; the clamping member abuts against the retaining ring through a bearing; the support bracket is through-hole at the center position of the retaining ring.

[0010] Furthermore, the support platform comprises a support bracket and a rotating body rotatably mounted on the support bracket; the rotating body is coaxially arranged with the pressing member;

[0011] A limiting ring is provided on the side of the rotating body opposite to the pressing member, and the limiting ring is coaxially arranged with the limiting ring and the rotating body, and the inner side wall of the limiting ring forms a first positioning portion, and the outer side wall of the limiting ring forms a second positioning portion.

[0012] Furthermore, the support platform has a motor fixing plate slidingly arranged on the support bracket along the radial direction of the rotating body, a servo motor fixed on the motor fixing plate, a driving wheel and a compression spring arranged at the output end of the servo motor, and a driven wheel arranged opposite to the driving wheel is provided on the rotating body, and the compression spring pushes the driving wheel to move in the direction of the driven wheel and engage with the driven wheel.

[0013] Furthermore, a spring support column for supporting a compression spring is fixed on the motor fixing plate; a through hole for the spring support column to pass through is provided on the side wall of the support bracket, and one end of the spring support column passes through the through hole and extends freely outward;

[0014] The compression spring is sleeved on the outside of the spring support column, the first end of the compression spring abuts against the motor fixing plate, and the second end of the compression spring abuts against the inner side wall of the support bracket.

[0015] Furthermore, the spring support column is provided with a first limiting nut and a second limiting nut respectively threadedly connected to the spring support column;

[0016] The first limiting nut and the second limiting nut are arranged on both sides of the through hole, wherein the first end of the first limiting nut abuts against the compression spring, and the second end of the first limiting nut abuts against the inner side wall of the support bracket.

[0017] Furthermore, the positioning device for the inner annular seam welding has a lifting mechanism arranged above the support platform; the lifting mechanism has a fixed frame and a sliding plate slidably arranged on the fixed frame;

[0018] A slideway extending along the sliding direction of the sliding plate is provided on the side of the sliding plate away from the fixing frame; the pressing mechanism is slidably mounted on the slideway; and the driving mechanism is fixed on the sliding plate.

[0019] Another embodiment of the present invention also discloses a welding system including the positioning device for inner ring seam welding described above, the positioning device and the welding device arranged on the clamping mechanism, the welding device including a welding gun and an adjusting device for adjusting the position of the welding gun, the adjusting device is fixed on the clamping bracket of the clamping mechanism and moves closer to or away from the support platform with the clamping bracket; the adjusting device is arranged on the upper side of the clamping member.

[0020] Furthermore, the adjustment device includes an upper and lower fine-tuning slide fixed on the clamping bracket, a cross slide slidably arranged on the upper and lower fine-tuning slide in the up and down directions, and a welding gun fixing seat fixed on the cross slide;

[0021] The cross sliding seat includes a first sliding seat for fixing the welding gun fixing seat and driving the welding gun fixing seat to slide along a first direction, and a second sliding seat for fixing the first sliding seat and driving the first sliding seat to slide along a second direction perpendicular to the first direction.

[0022] Furthermore, the welding system includes a workroom, a dust removal device provided on the workroom, a dust removal fan connected to the dust removal device, a control system and a welding power supply;

[0023] A working chamber for accommodating the positioning device and the welding device is provided in the workshop, and the dust removal fan, the welding power supply and the control system are all arranged outside the working chamber; a working chamber door for opening the working chamber is provided on the side wall of the workshop.

[0024] Compared to existing technologies, the present invention achieves axial stability by rotating the workpiece on a support platform and pressing it downward with a synchronously rotating clamp above the workpiece. Furthermore, a through-hole for the welding gun is provided in the clamp, allowing the gun to penetrate deeply into the inner side of the outer tube. During the actual welding process, while the welding gun is fixed, the support platform rotates to drive the workpiece, thereby achieving the inner annular weld. This ensures stable positioning of the workpiece and convenient welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a submersible pump for a workpiece to be welded disclosed in an embodiment of the present invention;

[0026] Figure 2 1 is a schematic structural diagram of a welding system disclosed in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of a first installation structure of a positioning device and a welding device in a welding system disclosed in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of a second installation structure of a welding system positioning device and a welding device disclosed in an embodiment of the present invention;

[0029] Figure 5 1 is a schematic structural diagram of a positioning device in a welding system disclosed in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the first structure of the welding system disclosed in an embodiment of the present invention after the workpiece to be welded is pressed and positioned;

[0031] Figure 7 This is a second structural schematic diagram of the welding system disclosed in an embodiment of the present invention after the workpiece to be welded is pressed and positioned;

[0032] Figure 8 1 is a structural diagram of a lifting mechanism in a welding system disclosed in an embodiment of the present invention;

[0033] Figure 9 1 is a schematic structural diagram of a clamping mechanism in a welding system disclosed in an embodiment of the present invention;

[0034] Figure 10 1 is a schematic structural diagram of a first flange positioning device in a welding system disclosed in an embodiment of the present invention;

[0035] Figure 11 1 is a schematic structural diagram of a welding gun and an adjusting device in a welding system disclosed in an embodiment of the present invention;

[0036] Figure 12 1 is a first structural diagram of a support platform in a welding system disclosed in an embodiment of the present invention;

[0037] Figure 13 is a second structural schematic diagram of the support platform in the welding system disclosed in an embodiment of the present invention;

[0038] Figure 14 is a third structural schematic diagram of the support platform in the welding system disclosed in an embodiment of the present invention;

[0039] Figure 15 This is a schematic diagram of a first assembly structure of a driving motor driving a driven wheel in a welding system disclosed in an embodiment of the present invention;

[0040] Figure 16 This is a schematic diagram of a second assembly structure of a driving motor driving a driven wheel in a welding system disclosed in an embodiment of the present invention;

[0041] Figure 17 It is a structural schematic diagram of an upper limit ring on a rotating body in a welding system disclosed in an embodiment of the present invention.

[0042] Explanation of the accompanying symbols: 1-welding gun, 2-support platform, 21-support bracket, 210-perforation, 211-bracket slide, 22-rotating body, 23-limiting ring, 231-first positioning part, 232-second positioning part, 24-servo motor, 25-motor fixing plate, 251-spring support column, 252-first limiting nut, 253-second limiting nut, 26-driving wheel, 27-driven wheel, 28-compression spring, 29-nearby switch,

[0043] 3-adjustment device, 31-cross sliding seat, 311-first slide, 312-second slide, 32-welding gun fixed seat, 321-welding gun support rod, 322-fixed seat body, 33-up and down fine-tuning slide, 34-wire feeding mechanism, 35-image acquisition unit,

[0044] 4-pressing mechanism, 41-pressing bracket, 410-support bracket perforation, 411-annular support plate, 412-blocking ring, 413-bracket body, 42-pressing member, 421-pressing part, 422-welding gun perforation,

[0045] 5- driving mechanism,

[0046] 6-first flange positioning device, 61-fixed seat, 610-slide groove, 611-locking mechanism, 62-locating pin, 63-cylinder, 64-cylinder fixing plate, 641-body, 642-bearing part, 65-guide sleeve, 651-guide groove, 66-guide block,

[0047] 7 - lifting mechanism, 70 - fixed frame, 71 - sliding plate, 710 - waist-shaped hole, 72 - screw, 73 - slideway, 74 - screw nut, 75 - motor, 76 - connecting piece, 8 - second flange positioning device, 9 - workroom, 90 - working chamber, 91 - working chamber door, 10 - control system, 20 - welding power supply, 30 - dust removal fan, 40 - dust removal device,

[0048] 100 - shell tube, 200 - upper flange, 201 - upper threaded mounting hole, 202 - flange limiting ring, 203 - upper connecting pipe, 300 - lower flange, 301 - lower threaded mounting hole, 302 - lower connecting pipe. DETAILED DESCRIPTION

[0049] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0050] Embodiments of the present invention: Figure 1As shown, a welding system for girth welding is disclosed, which is mainly used for welding workpieces with welds located on the inner side of a pipe, such as the welding and fixing of flanges on both sides of the casing pipe of a submersible pump. Specifically, Figure 1 The figure shows a submersible pump casing pipe 100 to be welded, and an upper flange 200 and a lower flange 300 located at each end of the casing pipe 100. A flange retaining ring 202 is provided on the inner sidewall of the upper flange 200, and a corresponding flange retaining ring is also provided on the inner sidewall of the lower flange 300. One end of the casing pipe 100 abuts the flange retaining ring 202 of the upper flange 200, and the other end abuts the retaining ring of the lower flange 300. The weld between the casing pipe 100 and the corresponding flange is located between the flange retaining ring 202 and the casing pipe 100. Because the weld is located on the inner side of the flange, it poses challenges to both positioning and welding the workpieces to be welded. In addition, the workpiece after welding is completed is required to have the upper threaded mounting hole 201 of the upper flange 200 and the lower threaded mounting hole 301 of the lower flange 300 relative to each other after welding is completed. This position is coaxially arranged on the upper flange 200 and the lower flange 300, and the upper connecting pipe 203 arranged on the upper flange 200 and the lower connecting pipe 302 arranged on the lower flange 300 are also coaxially arranged. The above welding requirements further increase the difficulty of positioning and welding.

[0051] In order to solve the above technical problems, the present invention discloses a welding system such as Figure 2 -7, comprising a positioning device for positioning the workpiece to be welded and a welding device for welding the weld seam on the positioned workpiece to be welded.

[0052] The positioning device includes a support table 2 for supporting the workpiece to be welded, a clamping mechanism 4 arranged above the support table 2, a driving mechanism 5 for driving the clamping mechanism 4 to move closer to or away from the support table 2, and a first flange positioning device 6 and a second flange positioning device 8 arranged between the clamping mechanism 4 and the support table 2 in an up and down direction.

[0053] After the first flange positioning device 6 and the second flange positioning device 8 respectively position the upper flange 200 and the lower flange 300, the drive mechanism 5 drives the clamping mechanism 3 to move toward the support platform 2. The downward pressure of the clamping member 42 acts on the upper flange 200, and this downward pressure is then transmitted to the lower flange 300 through the outer shell tube 100, placing the lower flange 300 on the support platform 2. This structural arrangement realizes the clamping and fixing of the workpiece to be welded between the clamping mechanism 4 and the support platform 2.

[0054] Since the weld is an inner annular weld, in order to realize the rotation of the workpiece to be welded after positioning so as to facilitate the welding of the weld by the welding gun 1 in the welding device, in this embodiment, the support platform 2 has a support bracket 21 and a rotating body 22 rotatably mounted on the support bracket 21; the clamping mechanism 4 has a clamping bracket 41 and a clamping member 42 rotatably mounted on the clamping bracket 41; wherein, the clamping member 42 is coaxially arranged with the rotating body 22.

[0055] Specifically, such as Figure 9 As shown, the end of the pressing member 42 away from the support platform 2 is connected to the pressing bracket 41 through a bearing; the end of the pressing member 42 close to the support platform 2 is provided with a pressing portion 421 for abutting against one end of the workpiece to be welded.

[0056] Since the weld seam of the workpiece to be welded is located on the inner side of the flange, in order to facilitate the welding of the weld seam by the welding gun 1, a welding gun through-hole 422 for the welding gun to pass through is provided on the clamping member 42. Correspondingly, a support frame through-hole 410 is provided on the clamping bracket 41 and is connected to the welding gun through-hole 422.

[0057] like Figure 7 In this embodiment, the clamping bracket 41 comprises an annular support plate 411 coaxially arranged with the clamping member 42, a retaining ring 412 arranged on the annular support plate 411 at one end away from the support platform 2, and a bracket body 413 for supporting the annular support plate 411. The bracket body 413 is provided with a mounting hole for mounting and fixing the annular support plate 411, and the mounting hole passes through the axial direction of the rotating body 22. The outer wall of the annular support plate 411 is fixed to the inner wall of the mounting hole. The clamping member 42 abuts against the retaining ring 412 via a bearing. The support bracket through-hole 410 is a through-hole at the center of the retaining ring 412. One end of the clamping member 42 abuts against the corresponding annular support plate 411 via a bearing, which can ensure the stable rotation of the clamping member 42 when the clamping member is subjected to a large clamping force, which is beneficial for the clamping and fixing of the workpiece to be welded.

[0058] The pressing member 42 is moved toward the rotating body 22 by the driving mechanism 5, thereby pressing and securing the workpiece to be welded between the rotating body 22 and the pressing member 42. The rotating body 22 is configured to be rotatable, and during the rotation of the rotating body 22, the pressing member 42 is driven by the workpiece to be welded, thereby synchronously driving the rotating body 22. With this structural arrangement, the weld seam and the welding gun 1 can be moved relative to each other by rotating the workpiece to be welded while the welding gun 1 is stationary, thereby achieving welding and securing the entire weld seam with the welding gun 1.

[0059] In this embodiment, the first flange positioning device 6 is used to limit the circumferential rotation of the upper flange 200 about the outer shell tube 100, and the second flange positioning device 8 is used to limit the circumferential rotation of the lower flange 300 about the outer shell tube 100. Specifically, the first flange positioning device 6 and the second flange positioning device 8 are used to position the upper flange 200 and the lower flange 300, respectively, circumferentially, so that the upper flange 200 and the lower flange 300 are installed and positioned at corresponding positions on the outer shell tube 100. The first flange positioning device 6 and the second flange positioning device 8 effectively serve as reference points, indicating that corresponding positions on the spaced-apart upper flange 200 and lower flange 300 correspond to each other. This ensures that the welded upper and lower flanges 200 and 300 meet installation requirements. In this embodiment, the upper threaded mounting hole 201 on the upper flange 200 and the lower threaded mounting hole 301 on the lower flange 300 are used as reference points. The first flange positioning device 6 is used to locate the upper threaded mounting hole 201 on the upper flange 200, and the second flange positioning device 8 is used to locate the lower threaded mounting hole 301 on the lower flange 300.

[0060] The present invention uses a first flange positioning device 6 and a second flange positioning device 8 to position the threaded mounting holes of the upper flange 200 and the threaded mounting holes of the lower flange 300, respectively, to ensure that the threaded holes of the upper flange 200 and the lower flange 300 are relative to each other after welding, so that the threaded holes of the upper flange 200 and the lower flange 300 can be precisely aligned after welding. Finally, the positioned upper flange 200, the lower flange 300, and the shell tube 100 located between the upper flange 200 and the lower flange 300 are pressed and fixed on the rotatable support platform 2 by the clamping mechanism 4. As the support platform 2 rotates, the flange and the shell tube are axially pressed and positioned by the clamping mechanism 4 during the welding process to avoid misalignment during the welding process, thereby facilitating the positioning welding of the annular weld. It also improves the installation consistency of the threaded holes of the two end flanges after positioning, facilitating the installation and use of the workpiece after welding. At the same time, the relative movement between the welding gun 1 and the weld is achieved by rotating the workpiece to be welded, facilitating the welding of the annular weld while the welding gun 1 is fixed in position.

[0061] In the prior art, annular welds are typically welded by moving the welding gun 1. However, precise positioning of the welding gun 1 and the smooth movement of the welding gun 1 during welding are challenges, which can easily lead to poor weld quality. In this solution, since the welding gun 1 is fixed while the workpiece to be welded rotates uniformly under the action of the rotating body 22, the distance between the weld and the welding gun 1 can be effectively maintained, thereby improving the weld quality.

[0062] like Figure 3As shown in Figure 8, the positioning device has a lifting mechanism 7 disposed above the support platform 2. The lifting mechanism 7 includes a fixed frame 70, a sliding plate 71 slidably disposed on the fixed frame 70, and a vertical drive unit that drives the sliding plate 71 to slide up and down. The vertical drive unit includes a screw 72 disposed vertically on the fixed frame 70, a screw nut 74 adapted to the screw 72, and a motor 75 that drives the screw 72 to rotate. The screw nut 74 is disposed on the side of the sliding plate 71 opposite the fixed frame 70. Both ends of the screw 72 are rotatably mounted on the fixed frame 70. The motor 75 is connected to the drive screw 72 via a coupling and drives the drive screw 72 to rotate. The drive screw 72 cooperates with the screw nut 74, and the screw nut 74 drives the sliding plate 71 to slide up and down along the fixed frame 70, causing the sliding plate 71 to move toward or away from the support platform 2.

[0063] The drive mechanism 5 that drives the clamping mechanism 4 to move is installed on the lifting mechanism 7. As the lifting mechanism 7 moves, the drive mechanism 5 drives the entire clamping mechanism 4 to move closer to or away from the support platform 2. After the lifting mechanism 7 drives the clamping mechanism 4 to descend to a certain position, the drive mechanism 5 drives the clamping mechanism 4 to move. The above structure actually forms a two-stage transmission system for the movement of the clamping mechanism 4, which can achieve more precise adjustment and control of the position of the clamping mechanism 4, and can better provide better clamping force for the workpiece to be welded.

[0064] Specifically, such as Figure 6 As shown, a slideway 73 extending along the sliding direction of the sliding plate 71 is provided on the side of the sliding plate 71 facing away from the fixed frame 7; the pressing mechanism 4 is slidably mounted on the slideway 73. Specifically, a slider that slidably cooperates with the slideway 73 is provided on the pressing bracket 41, and the pressing bracket 41 is slidably mounted on the slideway 73. In this embodiment, the driving mechanism 5 is a driving cylinder fixed to the sliding plate 71. The base of the driving cylinder is fixed to the sliding plate 71, and the cylinder push rod of the cylinder is fixedly connected to the pressing bracket 41 via a connecting member 76.

[0065] In order to better utilize space, in this embodiment, the driving mechanism 5 is arranged on the side of the sliding plate 71 opposite to the slideway 73. Accordingly, the sliding plate 71 is provided with a waist-shaped hole 710 for the connecting member 76 to pass through, and the extending direction of the waist-shaped hole 710 is consistent with the sliding direction of the sliding plate 71.

[0066] In this embodiment, in order to realize welding of the shell tubes 100 of different lengths, as shown in FIG. Figure 6As shown in FIG. 8 , the first flange positioning device 6 is fixed to the underside of the sliding plate 71, and the second flange positioning device 8 is fixed to the support bracket 21. The second flange positioning device 8 is fixed, and the spacing between the first flange positioning device 6 and the second flange positioning device 8 is adjusted by adjusting the position of the first flange positioning device 6. Because the first flange positioning device 6 is fixed to the sliding plate 71, it can move up and down with the movement of the sliding plate 71, moving closer to or further away from the second flange positioning device 8 to meet the positioning requirements of flanges at both ends of the housing tube 100 of different lengths.

[0067] The above-described structure improves the applicability of the positioning device. When welding a long shell tube, the sliding plate 71 is driven to move away from the second flange positioning device 8. When welding a short shell tube, the sliding plate 71 is driven to move toward the second flange positioning device 8, so that the distance between the first flange positioning device 6 and the second flange positioning device 8 meets the distance between the flanges at both ends of the shell tube.

[0068] In this embodiment, if Figure 10 As shown, the first flange positioning device 6 and the second flange positioning device 8 have the same structure. The following is a detailed description of the structure of the first flange positioning device 6. The first flange positioning device includes a fixed seat 61 fixed on the sliding plate 71, a positioning pin 62 fixed to the fixed seat 61 movably along the up and down directions, and a cylinder 63 that controls the movement of the positioning pin 62. The push rod of the cylinder 63 is fixedly connected to the positioning pin 62 to control the extension and retraction of the positioning pin 62. The positioning pin 62 is adapted to the threaded mounting hole on the flange. In this embodiment, the threaded mounting hole of the flange is used as the positioning hole. Of course, in other embodiments, other positions can also be used to position the flange, but the selected position must be a position where the first flange positioning device 6 and the second flange positioning device 8 are both set and relative.

[0069] The positioning pin 62 of the first flange positioning device 6 and the positioning pin of the second flange positioning device 8 are coaxially arranged, and the axial direction of the positioning pin 62 of the first flange positioning device 6 is parallel to the axial direction of the rotating body 22 .

[0070] Furthermore, in the actual installation process, due to various reasons, the positioning pin 62 of the first flange positioning device 6 and the positioning pin of the second flange positioning device 8 are easily not on the same axis after the equipment is installed. In order to more conveniently adjust the two to be coaxial, in this embodiment, the fixing seat 61 is also provided with a cylinder fixing plate 64 that can be adjusted in position in a direction parallel to the surface of the support platform 2 and a locking mechanism 611 for locking the position of the cylinder fixing plate 64. The cylinder 63 is fixed on the cylinder fixing plate 64 and can move with the movement of the cylinder fixing plate 64. Similarly, the positioning pin 62 can also be adjusted under the drive of the cylinder fixing plate 64, so as to better ensure the coaxiality of the positioning pins on the two flange positioning devices, and the locking mechanism 611 is used to lock the cylinder fixing plate 64 after it is adjusted to the accurate position.

[0071] During actual adjustment, the positional deviation of the positioning pin 62 is generally small, so the adjustment range of the cylinder fixing plate 64 is limited. To facilitate fine-tuning of the cylinder fixing plate 64, this embodiment utilizes the following structure. Specifically, the fixing seat 61 is provided with a slide groove 610 extending toward the direction of the rotating body 22. The cylinder fixing plate 64 includes a main body 641 that slidably engages with the slide groove 610 and supporting portions 642 extending from the main body 641 at both ends. The supporting portions 642 overlap the fixing seat 61 to provide vertical support for the cylinder fixing plate 64.

[0072] The locking mechanism 611 is a bolt mounted on the fixing base 61. The fixing base 61 is provided with a bolt through-hole adapted for the bolt, which is connected to the slide 610. The bolt through-hole is provided on the side wall of the fixing base 61. The bolt is threadedly mounted within the bolt mounting hole, and one end of the bolt extends into the slide 610 to abut against the main body 641. Corresponding bolts are provided at both ends of the cylinder fixing plate 64 in the sliding direction, abutting against the cylinder fixing plate 64. Therefore, during actual adjustment, the position of the cylinder fixing plate 64 can be adjusted by simply adjusting the position of the bolt in the sliding direction. This structural arrangement facilitates fine-tuning of the cylinder fixing plate 64.

[0073] It should be noted that the fixing seat 61 of the first flange positioning device 6 is an independent component, which is directly fixed on the sliding plate 71, while the fixing seat of the second flange positioning device 8 is arranged on the support bracket 21, directly borrowing the space and position of the support bracket 21, thereby saving space and cost.

[0074] Furthermore, the first flange positioning device 6 further includes a guide sleeve 65 arranged parallel to the positioning pin 62. The guide sleeve 65 is fixed to the cylinder fixing plate 64 and is provided with a guide groove 651 along its axial direction. The positioning pin 62 is provided with a guide block 66 that slidably engages with the guide groove 651. The provision of the guide block 66 and the guide sleeve 65 can effectively ensure the stability of the positioning pin 62 during extension and retraction, thereby better ensuring the accuracy of positioning.

[0075] like Figure 3 -4 and Figure 11 As shown, the welding device of the welding system includes a welding gun 1 and an adjusting device 3 for adjusting the position of the welding gun 1, and the adjusting device 3 is fixed on the clamping mechanism 4 and moves with the clamping mechanism 4 toward or away from the support platform 2. The adjusting device 3 is arranged on the clamping mechanism 4 and moves with the clamping mechanism 4 toward the position of the weld, which facilitates the adjustment of the welding gun 1. Specifically, the adjusting device 3 is fixed on the clamping bracket 41, and the adjusting device 3 is arranged on the upper side of the clamping member 42. The adjusting device 3 and the clamping member 42 are arranged on the clamping bracket 41 in the up and down directions. The clamping member 42 is located on the lower side, and the clamping member 42 first clamps and fixes the workpiece to be welded, and then the adjusting device 3 fine-tunes the welding gun 1 downward to the position of the weld to be welded.

[0076] Specifically, the adjustment device 3 includes a cross slide 31, a welding gun fixing base 32 for fixing the welding gun 1, and a vertical fine-tuning slide 33; the vertical fine-tuning slide 33 is fixed to a clamping bracket 41, and the cross slide 31 is slidably mounted on the vertical fine-tuning slide 33. The vertical fine-tuning slide 33 drives the cross slide 31 up and down to move closer to or away from the weld, while the welding gun 1 is fixed to the cross slide 31 via the welding gun fixing base 32. The vertical fine-tuning slide 33 and the clamping mechanism 4 constitute a secondary drive unit for welding gun adjustment. The clamping mechanism 4 performs rough adjustments, while the vertical fine-tuning slide 33 performs more detailed adjustments. This structural arrangement enables the welding gun 1 to more accurately reach the height of the weld.

[0077] Specifically, the cross slide 31 is used to adjust the distance between the welding gun 1 and the weld on a plane. Specifically, the cross slide 31 includes a first slide 311 that secures the welding gun mount 32 and drives the welding gun mount 32 to move in a first direction, and a second slide 312 that secures the first slide 311 and drives the first slide 311 to move in a second direction. The first and second directions are perpendicular to each other and lie in a horizontal plane.

[0078] The welding gun mount 32 includes a mount body 322 and a welding gun support rod 321 secured to the mount body 322. The welding gun support rod 321 extends vertically, and the welding gun 1 is vertically secured to the welding gun support rod 321. The welding gun 1 extends radially along the outer shell tube 100 to facilitate welding of the weld seam. The welding gun support rod 321 can be configured as a telescopic rod to facilitate adjustment of the height of the welding gun 1.

[0079] A wire feeding mechanism 34 is also fixed to the welding gun support rod 321. The wire feeding mechanism 34 is used to provide the raw materials required for welding to the welding gun 1. Furthermore, in order to better and more timely observe the welding effect of the welding gun 1 and the status of the welding gun 1 after position adjustment, an image acquisition unit 35 is also provided on the welding gun fixing base 32.

[0080] The welding method for annular welds using the above welding system comprises the following steps:

[0081] First, the first flange positioning device 6 and the second flange positioning device 8 are inspected using standard parts to determine whether they are coaxial. If they are not coaxial, the first flange positioning device 6 or the second flange positioning device 8 is adjusted. Specifically, the locking mechanism 611 on the fixing seat 61 is adjusted to adjust the cylinder fixing plate 64 of the first flange positioning device 6 to move forward and backward, thereby ensuring that the positioning pin 62 on the first flange positioning device 6 is coaxial with the positioning pin on the second flange positioning device 8.

[0082] Place the outer shell tube 100 on the support platform 2, specifically place the outer shell tube 100 on the rotating body 22, place the lower flange 300 on the first end of the outer shell tube 100, and control the driving mechanism 5 to drive the clamping mechanism 4 to move toward the support platform 2 to press the lower flange 300 onto the outer shell tube 100.

[0083] The lower flange 300 is welded to the outer shell tube 100 by a welding gun 1. In this embodiment, distributed welding is adopted. The lower flange 300 at one end of the outer shell tube 100 is first welded to form an intermediate piece. Then, the welded intermediate piece is reversed so that the lower flange 300 is placed on the support table 2. Specifically, the lower flange 300 is placed on the rotating body 22 and positioned by the second flange positioning device 8. Specifically, the lower flange 300 is positioned in the lower threaded mounting hole 301 of the lower flange 300 by the second flange positioning device 8. When welding the lower flange 300, there are no excessive requirements for the welding position of the lower flange 300, and there is no need to position the lower flange 300 in the circumferential direction. Because the workpiece after welding only needs to ensure the consistency of the upper flange 200 and the lower flange 300, it is sufficient to position it when welding the upper flange 200.

[0084] The upper flange 200 is placed on the second end of the housing tube 100 and positioned into the upper threaded mounting hole 201 of the upper flange 200 by the first flange positioning device 6 .

[0085] The pressing mechanism 4 presses down to press the upper flange 200 onto the housing tube 100 , and the upper flange 200 is welded to the housing tube 100 by the welding gun 1 .

[0086] This case adopts distributed welding. The lower flange 300 is welded first. During the welding process of the lower flange 300, it is only necessary to press the lower flange 300 and the outer shell tube 100 onto the rotating body 22 of the support platform 2 through the clamping mechanism 4, and there is no need for the flange positioning device to position it circumferentially. Then the upper flange 200 is welded. During the welding process of the upper flange 200, it is necessary to position the upper flange 200 and the lower flange 300 respectively through the first flange positioning device 6 and the second flange positioning device 8 to ensure that the threaded holes of the two are coaxially arranged in the axial direction. In this way, the weld to be welded is always in a position close to the welding gun 1 during the two welding processes, thereby saving the moving distance of the welding gun 1 and facilitating the use of the welding gun 1.

[0087] During the entire welding process, the rotating body 22 plays the role of supporting the shell tube 100 and also plays the role of supporting the lower flange 300. In order to better play the role of positioning support, Figure 15 As shown, a limiting ring 23 is provided on the rotating body 22 for limiting the position of the housing tube 100 and the lower flange 300 on a basic plane.

[0088] A limiting ring 23 is disposed on the side of the rotating body 22 opposite the pressing member 42. The inner sidewall of the limiting ring 23 forms a first positioning portion 231, which opposes the outer sidewall of the outer shell tube 100 to restrict the axial movement of the outer shell tube 100. The outer sidewall of the limiting ring 23 forms a second positioning portion 232, which opposes the inner sidewall of the lower flange 300 to restrict the axial movement of the lower flange 300. The positioning ring 23 restricts the axial rotation of the outer shell tube 100 and the lower flange 300.

[0089] like Figure 12 As shown in FIG-17 , the rotating body 22 is rotatably mounted on the support platform 2 via bearings. The support platform 2 also includes a drive unit for driving the rotating body 22. In this embodiment, the drive unit may be a servo motor 24, the output of which is connected to a fixed drive wheel 26. To better provide transmission power to the rotating body 22, the servo motor 24 is connected to a gearbox, and the drive wheel 26 is fixed to the output of the gearbox. Correspondingly, a driven wheel 27 is provided on the rotating body 22, meshing with the drive wheel 26. The driven wheel 27 is coaxially arranged with the rotating body 22 and is driven by the servo motor 24 to rotate the rotating body 22.

[0090] like Figure 14 As shown in FIG-16 , the support platform 2 further comprises a motor fixing plate 25 and a compression spring 28 for fixing the servo motor 24. The motor fixing plate 25 is slidably mounted on the support bracket 21 along the radial direction of the rotating body 22. A bracket slide 211 is provided on the support bracket 21, which is adapted to the motor fixing plate 25. The motor fixing plate 25 slides along the bracket slide 211. The rebound force of the compression spring 28 acts on the motor fixing plate 25 and pushes the motor fixing plate 25 toward the rotating body 22, thereby driving the driving wheel 26 toward the driven wheel 27 so that the driving wheel 26 and the driven wheel 27 are engaged.

[0091] The compression spring 28 extends along the sliding direction of the motor fixing plate 25. One end of the compression spring 28 is fixed to the support bracket 21, and the other end of the compression spring 28 abuts against the motor fixing plate 25. The above-mentioned structure enables the driving wheel 26 and the driven wheel 27 to achieve flexible engagement, which can eliminate problems such as jamming and uneven operation caused by gaps in the gear meshing during the transmission process.

[0092] In order to better achieve the pushing effect of the compression spring 28 on the motor fixing plate 25, a spring support column 251 is fixed to the motor fixing plate 25. The compression spring 28 is mounted on the outside of the spring support column 251. The spring 28 is compressed or restored along the spring support column 251 during the compression or recovery process. The provision of the spring support column 251 can improve the stability of the compression spring 28 during operation. One end of the spring support column 251 is fixed to the motor fixing plate 25, and the other end extends freely toward the side wall of the support bracket 21. The side wall of the support bracket 21 is provided with a through hole 210 for the spring support column 251 to pass through. One end of the spring support column 251 passes through the through hole 210 and extends freely outward. The two ends of the compression spring 28 respectively abut the support bracket 21 and the motor fixing plate 25.

[0093] Furthermore, the spring support column 251 is provided with a first limiting nut 252 and a second limiting nut 253, both of which are threadedly connected to the spring support column 251. The first limiting nut 252 and the second limiting nut 253 are respectively arranged on either side of the through-hole 210, wherein the first end of the first limiting nut 252 abuts the compression spring 28, and the second end of the first limiting nut 252 abuts the inner side wall of the support bracket 21. By adjusting the distance between the first limiting nut 252 and the second limiting nut 253, the range of motion of the motor fixing plate 25 can be adjusted. By tightening the nuts, the rebound force of the compression spring 28 can be adjusted as needed, thereby improving the applicability of the device. In addition, the blocking effect of the first limiting nut 252 and the second limiting nut 253 can avoid the problem of the motor fixing plate 25 moving a large distance due to excessive compression or excessive expansion of the spring. At the same time, the provision of the first limiting nut 252 and the second limiting nut 253 also facilitates the installation and fixation of the motor fixing plate 25 and the compression spring 28 .

[0094] In order to better control the rotation of the rotating body 22, a proximity switch 29 is fixed on the support platform in this embodiment for judging whether the rotating body 22 has rotated one circle. After detecting one circle, the proximity switch 29 controls the rotating body 22 to continue rotating.

[0095] like Figure 2 As shown, the welding system claimed in the present application also includes a workshop 9 for enclosing the welding device and the positioning device, a control system 10 for operating the welding system, a welding power supply 20 for powering the entire control system, a dust removal fan 30, and a dust removal device 40 arranged on the workshop 9 and cooperating with the dust removal fan 30 for removing dust from the workshop 9.

[0096] A working chamber 90 for accommodating the positioning device and the welding device is provided in the workroom 9, and the dust removal fan 30, the welding power supply 20 and the control system 10 are all arranged outside the working chamber 90; a working chamber door 91 for opening the working chamber 90 is provided on the side wall of the workroom 9.

[0097] The dust removal device 40 is positioned above the workroom 9 to facilitate dust removal within the workroom 9. It should be noted that the dust removal device 40 and dust removal blower 30 in this embodiment are both conventional devices, and this application does not improve upon their specific structures. The connection between the welding power source 20 and the control system 10 also utilizes conventional connection and installation methods, which will not be elaborated upon here.

[0098] The welding equipment and positioning device are placed in the workroom 9, so that the equipment is enclosed in the workroom 9 during the welding process. At the same time, the air in the workroom 9 is purified by the dust removal equipment, thereby preventing dust from affecting the welding quality during the welding process. The workroom 9 is provided with a conveniently opened working chamber door 91 to facilitate manual placement and removal of parts before and after welding.

[0099] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A positioning device for inner girth welding, comprising a rotatable support platform, a clamping mechanism disposed above the support platform, and a driving mechanism for driving the clamping mechanism to move toward or away from the support platform; It is characterized by: The clamping mechanism comprises a clamping bracket and a clamping member rotatably mounted on the clamping bracket; an end of the clamping member away from the support platform is connected to the clamping bracket via a bearing; an end of the clamping member close to the support platform is provided with a clamping portion for abutting against one end of a workpiece to be welded; The pressing piece is provided with a welding gun through-hole penetrating along the axial direction of the pressing piece; the pressing bracket is provided with a support bracket through-hole communicating with the welding gun through-hole.

2. The positioning device for inner girth welding according to claim 1, characterized in that: The clamping bracket has an annular support plate coaxially arranged with the clamping member and a retaining ring arranged on the annular support plate away from one end of the support platform; the clamping member abuts against the retaining ring through a bearing; the support bracket through-hole is a through hole at the center position of the retaining ring.

3. The positioning device for inner girth welding according to claim 1, characterized in that: The support platform comprises a support bracket and a rotating body rotatably mounted on the support bracket; the rotating body is coaxially arranged with the pressing member; A limiting ring is provided on the rotating body on a side opposite to the pressing member. The limiting ring is coaxially arranged with the rotating body, and the inner side wall of the limiting ring forms a first positioning portion, and the outer side wall of the limiting ring forms a second positioning portion.

4. The positioning device for inner girth welding according to claim 3, characterized in that: The support platform has a motor fixing plate slidingly arranged on the support bracket along the radial direction of the rotating body, a servo motor fixed on the motor fixing plate, a driving wheel and a compression spring arranged at the output end of the servo motor, and a driven wheel arranged opposite to the driving wheel is provided on the rotating body, and the compression spring pushes the driving wheel to move toward the driven wheel and engage with the driven wheel.

5. The positioning device for inner girth welding according to claim 4, characterized in that: A spring support column for supporting a compression spring is fixed on the motor fixing plate; a through hole for the spring support column to pass through is provided on the side wall of the support bracket, and one end of the spring support column passes through the through hole and extends freely outward; The compression spring is sleeved on the outside of the spring support column, the first end of the compression spring abuts against the motor fixing plate, and the second end of the compression spring abuts against the inner side wall of the support bracket.

6. The positioning device for inner girth welding according to claim 5, characterized in that: The spring support column is provided with a first limiting nut and a second limiting nut which are respectively threadedly connected to the spring support column; The first limiting nut and the second limiting nut are arranged on both sides of the through hole, wherein the first end of the first limiting nut abuts against the compression spring, and the second end of the first limiting nut abuts against the inner side wall of the support bracket.

7. The positioning device for inner girth welding according to claim 1, characterized in that: The positioning device for inner annular seam welding comprises a lifting mechanism arranged above the support platform; the lifting mechanism comprises a fixed frame and a sliding plate slidably arranged on the fixed frame; A slideway extending along the sliding direction of the sliding plate is provided on the side of the sliding plate away from the fixing frame; the pressing mechanism is slidably mounted on the slideway; and the driving mechanism is fixed on the sliding plate.

8. A welding system, characterized in that: It includes a positioning device as described in any one of claims 1 to 7 and a welding device arranged on the clamping mechanism, the welding device includes a welding gun and an adjusting device for adjusting the position of the welding gun, the adjusting device is fixed on the clamping bracket of the clamping mechanism and moves closer to or away from the support platform with the clamping bracket; the adjusting device is arranged on the upper side of the clamping member.

9. The welding system according to claim 8, characterized in that: The adjusting device includes an upper and lower fine-tuning slide fixed on the pressing bracket, a cross slide slidably arranged on the upper and lower fine-tuning slide in the up and down directions, and a welding gun fixing seat fixed on the cross slide; The cross sliding seat includes a first sliding seat for fixing the welding gun fixing seat and driving the welding gun fixing seat to slide along a first direction, and a second sliding seat for fixing the first sliding seat and driving the first sliding seat to slide along a second direction perpendicular to the first direction.

10. The welding system according to claim 8, wherein: The welding system includes a workroom, a dust removal device arranged on the workroom, a dust removal fan connected to the dust removal device, a control system and a welding power supply; A working chamber for accommodating the positioning device and the welding device is provided in the workshop, and the dust removal fan, the welding power supply and the control system are all arranged outside the working chamber; a working chamber door for opening the working chamber is provided on the side wall of the workshop.

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