A positioning tool for flange welding assembly

Abstract

The present application relates to the technical field of welding positioning, in particular to a positioning tool for flange welding assembly; comprising a welding table and a supporting leg fixedly connected to the lower surface of the welding table; the upper surface of the welding table is provided with a lower cylinder with an opening facing upward; a single-opening lower cylinder is slidably connected with an upper column on the inner side; the lower surface of the upper column is connected with the inner bottom wall of the lower cylinder through a tension spring; the upper surface of the upper column is provided with a cross groove and is fixedly connected with an upper disc; the inner side of the cross groove is provided with an upper electric push rod fixedly connected with the upper disc; the output end of the upper electric push rod is fixedly connected with an upper clamping piece; the inner and outer walls of the lower cylinder are provided with a transmission groove; the present application realizes automatic expansion of the tool in the vertical direction by using the weight of the workpiece, and realizes automatic retraction of the tool by relying on the tension spring after the workpiece load is removed after welding, thereby reducing the overall height; when the workpiece is sleeved into the tool, large-stroke lifting is not required, thereby reducing the operation difficulty of workpiece clamping and dismounting.

Description

Technical Field

[0001] This invention relates to the field of welding positioning technology, specifically a positioning fixture for flange welding assembly. Background Technology

[0002] In the field of welding and assembling flanges at both ends of motor housing, the welding and assembly operation of motor housing and flanges at both ends has strict process requirements for the concentricity of the upper and lower flanges. The concentricity accuracy directly determines the quality of subsequent finished product processing. If the concentricity exceeds the tolerance, the workpiece is very likely to be scrapped in the subsequent finishing process.

[0003] Therefore, to achieve precise flange positioning, a large number of positioning fixtures for welding and assembling motor housing flanges have emerged in the existing technology. Most of these fixtures are equipped with two sets of radial clamping mechanisms, one above the other, to clamp the upper and lower flanges respectively, thereby ensuring the coaxial positioning accuracy of the flanges during the welding process. However, most of the similar positioning fixtures on the market are relatively high in overall height. When clamping the workpiece, the heavy motor housing along with the flanges to be welded at both ends needs to be lifted with a large stroke by the hoisting equipment. The workpiece is lifted high from above the fixture and then placed on the outside of the positioning fixture to complete the assembly. The large lifting stroke of the workpiece places high demands on the working stroke of the hoisting equipment and the hoisting operation skills. The workpiece hoisting and placement process is not only cumbersome but also difficult to load. In addition, after welding is completed, the workpiece needs to be lifted to a high position to be unloaded from the positioning fixture, which also makes the unloading of the workpiece difficult.

[0004] In addition, existing positioning fixtures have problems such as low positioning accuracy and poor versatility, and cannot meet the welding positioning requirements of motor housings and flanges of different heights and diameters. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention proposes a positioning fixture for flange welding assembly. This invention utilizes the workpiece's own weight to automatically unfold the fixture vertically. After welding is completed and the workpiece load is removed, a tension spring automatically retracts the fixture, lowering its overall height. When the workpiece is fitted into the fixture, no large-stroke lifting is required, reducing the difficulty of workpiece clamping and disassembly. Upper and lower clamping components respectively clamp and position the upper and lower flanges of the motor housing from the inside, ensuring concentricity during welding assembly and improving the quality of flange welding. The overall structure is simple and reliable, the assembly and disassembly process is convenient, and it is suitable for continuous operation of motor housing flange welding.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A positioning fixture for flange welding assembly, comprising a welding table and legs fixedly connected to the lower surface of the welding table; a lower cylinder with an upward-facing opening is provided on the upper surface of the welding table; an upper column is slidably connected to the inner side of the single-opening lower cylinder; the lower surface of the upper column is connected to the inner bottom wall of the lower cylinder by a tension spring; a cross groove is provided on the upper surface of the upper column and a top plate is fixedly connected thereto; an upper electric push rod fixedly connected to the top plate is provided inside the cross groove; an upper clamping component is fixedly connected to the output end of the upper electric push rod; A transmission groove is provided through the inner and outer walls of the lower cylinder; an upper guide wheel is rotatably connected to the upper part of the inner wall of the transmission groove; an inner transmission block and an outer transmission block are movably connected to the inner side of the transmission groove and below the upper guide wheel; a first pull rope is fixedly attached to the upper surface of the inner transmission block; the other end of the first pull rope passes upward around the upper guide wheel and is fixedly connected to the upper surface of the outer transmission block; the inner transmission block is fixedly connected to the lower part of the upper column; a lower ring disk is slidably connected to the outer wall of the lower cylinder and fixedly connected to the outer transmission block; a lower electric push rod is fixedly attached to the upper surface of the lower ring disk; a lower clamping member is fixedly attached to the output end of the lower electric push rod.

[0007] Preferably, the upper clamping member has an upper stepped groove at its lower position; the upper clamping member has an upper pressing groove that extends radially through the upper disc; the upper pressing groove extends downward and its inner wall is rotatably connected to an upper rotating shaft; the outer wall of the upper rotating shaft is fixedly connected to an upper rotating bar; the upper rotating shaft is driven by an upper motor; the lower clamping member has a lower stepped groove at its upper position; the lower clamping member has a lower pressing groove that extends radially through the lower annular disc; the lower pressing groove extends upward and its inner wall is rotatably connected to a lower rotating shaft; the outer wall of the lower rotating shaft is fixedly connected to a lower rotating bar; the lower rotating shaft is driven by a lower motor.

[0008] Preferably, the lower surface of the upper plate is provided with an inverted isosceles trapezoidal groove along the radial direction; an inverted isosceles trapezoidal strip fixed to the upper clamping member is slidably connected in the inverted isosceles trapezoidal groove; the upper surface of the lower ring plate is provided with a regular isosceles trapezoidal groove along the radial direction; a regular isosceles trapezoidal strip fixed to the lower clamping member is slidably connected in the regular isosceles trapezoidal groove.

[0009] Preferably, the upper plate has an upper annular groove inside; an upper gear ring is rotatably connected in the upper annular groove; an upper rotating groove is provided downward through the upper annular groove; an upper gear is rotatably connected in the upper rotating groove; all the upper gears mesh with the upper gear ring; an upper tooth is provided on one side of the upper clamping member near the upper plate; the upper gear meshes with the upper tooth on the corresponding upper clamping member.

[0010] Preferably, the lower ring disk has a lower annular groove inside; a lower gear ring is rotatably connected in the lower annular groove; a lower rotating groove is provided through the lower annular groove facing upward; a lower gear is rotatably connected in the lower rotating groove; all the lower gears mesh with the lower gear ring; a lower tooth is provided on one side of the lower clamping member near the lower ring disk; the lower gear meshes with the lower tooth on the corresponding lower clamping member.

[0011] Preferably, a lower guide wheel is rotatably connected to the lower part of the inner wall of the transmission groove; a second pull rope passes around the lower guide wheel; one end of the second pull rope is connected to the lower surface of the inner transmission block, and the other end is connected to the lower surface of the outer transmission block.

[0012] Preferably, the upper column has a limiting groove on its vertical outer wall; a limiting rod is movably connected in the limiting groove; the lower cylinder has a first adjusting groove on its vertical inner wall; the first adjusting groove is slidably connected to a first adjusting block fixed to the limiting rod; the first adjusting block extends vertically and is threadedly connected to a first screw; the upper end of the first screw protrudes from the lower cylinder and is rotatably connected to the lower cylinder.

[0013] Preferably, the lower surface of the upper column is provided with a groove; the inner wall of the groove is provided with a pull plate; the upper end of the tension spring is fixedly connected to the pull plate, and the lower end of the tension spring is fixedly connected to the bottom wall of the lower cylinder.

[0014] Preferably, the vertical inner wall of the pull groove is provided with a second adjusting groove; a second adjusting block fixedly connected to the pull plate is slidably connected up and down in the second adjusting groove; the second adjusting block runs through the upper and lower parts and is threadedly connected to a second screw; the upper end of the second screw extends into the cross groove; the second screw is rotatably connected to the upper column.

[0015] Preferably, a bottom motor is embedded in the upper surface of the welding platform; the output end of the bottom motor is fixed to the lower surface of the lower cylinder; the lower surface of the lower cylinder is connected to the welding platform through a plane bearing.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention utilizes the workpiece's own weight to automatically unfold the fixture vertically. After welding is completed and the workpiece load is removed, the fixture automatically retracts using a tension spring to reduce its overall height. No large-stroke lifting is required when fitting the workpiece into the fixture, reducing the difficulty of workpiece clamping and disassembly. The upper and lower clamping components respectively clamp and position the upper and lower flanges of the motor housing from the inside, ensuring concentricity during welding and assembly of the upper and lower flanges and improving the quality of flange welding. The overall structure is simple and reliable, the assembly and disassembly process is convenient, and it is suitable for continuous operation of motor housing flange welding.

[0018] 2. After the axial positioning of the motor housing and the upper and lower flanges, the present invention prevents the positioning fixture from folding in the vertical direction during the welding process, making the entire welding process more stable.

[0019] 3. This invention utilizes the meshing transmission between the upper gear ring and multiple sets of upper gears to achieve synchronous and equidistant radial extension and retraction of all upper clamping components, and utilizes the meshing transmission between the lower gear ring and multiple sets of lower gears to achieve synchronous and equidistant radial extension and retraction of all lower clamping components. This avoids flange eccentricity caused by inconsistent extension of the upper or lower clamping components, further ensuring the concentricity accuracy of the upper and lower flange assembly and welding. The upper and lower clamping components can be adapted to the centering clamping of flanges of various diameters and specifications, improving the versatility of the tooling.

[0020] 4. By rotating the first screw to adjust the vertical position of the limiting bar, the maximum upward stroke of the upper column can be changed, and the maximum unfolding height of the tooling can be adjusted. This allows it to be adapted to welding and positioning of motor housing flanges of different heights, expanding the range of workpieces that the tooling can be adapted to. The first screw has a self-locking thread, and the position of the limiting bar can be stably maintained after adjustment. The adjustment operation is simple and convenient. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the workpiece placed behind the lower ring disk according to the present invention;

[0023] Figure 2 This is a perspective view of the invention in its unfolded state;

[0024] Figure 3 This is a perspective view of the lower cylinder and the upper column in this invention;

[0025] Figure 4 This is a structural diagram of the lower cylinder in this invention;

[0026] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0027] Figure 6 This is a structural diagram of the lower gear ring and the lower gear in this invention;

[0028] Figure 7 This is a perspective view of the upper column in this invention;

[0029] Figure 8 This is a perspective view of the upper plate and the upper clamping member in this invention;

[0030] Figure 9 yes Figure 8 Enlarged view of point B in the middle;

[0031] Figure 10This is a structural diagram of the upper gear ring and the upper gear in this invention;

[0032] Figure 11 yes Figure 2 A sectional view;

[0033] Figure 12 yes Figure 11 Enlarged view of point C in the middle.

[0034] In the diagram: Welding table 1, support leg 11, bottom motor 12, plane bearing 13, lower cylinder 2, transmission groove 21, upper guide wheel 22, inner transmission block 23, outer transmission block 24, first pull rope 25, lower guide wheel 26, second pull rope 27, first adjusting groove 28, first adjusting block 281, first screw 282, upper column 3, cross groove 31, upper electric push rod 32, upper clamping part 33, upper step groove 331, upper pressing groove 332, upper rotating shaft 333, upper rotating bar 334, upper motor 335, limiting groove 34, limiting bar 35, pull groove 36, pull plate 37. Second adjusting groove 38, second adjusting block 39, second screw 391, tension spring 4, upper plate 5, inverted isosceles trapezoidal groove 51, inverted isosceles trapezoidal bar 52, upper annular groove 53, upper gear ring 54, upper rotating groove 55, upper gear 56, upper tooth 57, lower annular plate 6, lower electric push rod 61, lower clamping part 62, lower step groove 621, lower pressing groove 622, lower rotating shaft 623, lower rotating bar 624, lower motor 625, regular isosceles trapezoidal groove 63, regular isosceles trapezoidal bar 64, lower annular groove 65, lower gear ring 66, lower rotating groove 67, lower gear 68, lower tooth 69. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0036] like Figures 1 to 12 As shown, the present invention includes the following embodiments:

[0037] Example 1: A positioning fixture for flange welding assembly includes a welding table 1 and a support leg 11 fixed to the lower surface of the welding table 1; the upper surface of the welding table 1 is provided with a lower cylinder 2 with an upward opening; an upper column 3 is slidably connected to the inner side of the single-opening lower cylinder 2; the lower surface of the upper column 3 is connected to the inner bottom wall of the lower cylinder 2 by a tension spring 4; a cross groove 31 is provided on the upper surface of the upper column 3 and an upper plate 5 is fixedly connected thereto; an upper electric push rod 32 is provided inside the cross groove 31 and fixedly connected to the upper plate 5; the output end of the upper electric push rod 32 is fixedly connected to an upper clamping member 33; a transmission groove 21 is provided through the inner and outer walls of the lower cylinder 2. The upper guide wheel 22 is rotatably connected to the upper part of the inner wall of the transmission groove 21; the inner transmission block 23 and the outer transmission block 24 are movably connected to the inner side of the transmission groove 21 and below the upper guide wheel 22; the first pull rope 25 is fixedly attached to the upper surface of the inner transmission block 23; the other end of the first pull rope 25 is fixedly attached to the upper surface of the outer transmission block 24 after passing over the upper guide wheel 22; the inner transmission block 23 is fixedly attached to the lower part of the upper column 3; the lower ring disk 6, which is fixedly attached to the outer transmission block 24, is slidably connected to the outer wall of the lower cylinder 2; the lower electric push rod 61 is fixedly attached to the upper surface of the lower ring disk 6; the lower clamping member 62 is fixedly attached to the output end of the lower electric push rod 61.

[0038] This tooling is mainly used for welding and assembling the flanges at both ends of the motor housing, and it is necessary to ensure the concentricity accuracy of the upper and lower flanges.

[0039] In the initial state of the fixture, the upper column 3 is retracted and stored inside the lower cylinder 2, the upper plate 5 is at its lower limit position, and the lower ring plate 6 is at its upper limit position. The distance between the upper plate 5 and the lower ring plate 6 is the smallest, and the overall height of the fixture is low. During operation, the motor housing along with the flanges to be welded at both ends is inserted from the outside of the fixture. The low height of the fixture does not require the workpiece to be lifted significantly to complete the insertion, reducing the difficulty of lifting the workpiece. The workpiece will fall directly onto the lower ring plate 6.

[0040] After the external hoisting support of the workpiece is removed, the motor housing and flange (i.e., the workpiece) press down on the lower ring plate 6 under their own weight, driving the lower ring plate 6 to move downward. The lower ring plate 6 drives the outer transmission block 24 to move downward synchronously. The outer transmission block 24 pulls the first pull rope 25. The first pull rope 25 is guided by the upper guide wheel 22 and drives the inner transmission block 23 to move upward. The inner transmission block 23 is fixedly connected to the upper column 3, thereby driving the upper column 3 to slide upward along the inner wall of the lower cylinder 2. During the upward movement of the upper column 3, the tension spring 4 is stretched. The upper column 3 drives the upper plate 5 to rise upward. The upper plate 5 synchronously drives the upper electric push rod 32 and the upper clamping component. 33 moves upward, and the tooling automatically unfolds in the vertical direction; after the tooling is unfolded into place, the upper electric push rod 32 inside the cross groove 31 is controlled to extend outward, driving multiple sets of upper clamping parts 33 to extend radially outward, and clamping and positioning the upper part of the motor housing and the upper flange from the inside; at the same time, the lower electric push rod 61 on the lower ring plate 6 is controlled to extend outward, pushing the lower clamping part 62 to extend radially outward, pressing against the lower part of the motor housing and the inner side of the lower flange. The upper and lower clamping parts 62 respectively clamp the upper and lower flanges from the inside, so that the upper and lower flanges maintain a high degree of concentricity, and then the welding operation between the flange and the motor housing can be carried out.

[0041] After welding is completed, the welded motor housing and flange are lifted upwards using hoisting equipment, and the downward pressure of the workpiece on the lower ring plate 6 gradually disappears; the stretched tension spring 4 releases its elasticity, pulling the upper column 3 downwards to retract into the lower cylinder 2, and the upper column 3 drives the inner transmission block 23 to move downwards, which is driven by the first pull rope 25 and the upper guide wheel 22 to drive the outer transmission block 24 and the lower ring plate 6 to return to the upper position, and the overall height of the fixture is lowered again. Then the workpiece can be taken out from top to bottom, completing one assembly welding cycle, and the clamping and welding of the next set of workpieces can continue.

[0042] This invention utilizes the workpiece's own weight to automatically unfold the fixture vertically. After welding is completed and the workpiece load is removed, the fixture automatically retracts to reduce its overall height using the tension spring 4. When the workpiece is fitted into the fixture, there is no need for large-stroke lifting, reducing the difficulty of workpiece clamping and disassembly. The upper clamping member 33 and the lower clamping member 62 respectively clamp and position the upper and lower flanges of the motor housing from the inside, ensuring the concentricity of the upper and lower flanges during welding assembly and improving the quality of flange welding. The overall structure is simple and reliable, the assembly and disassembly process is convenient, and it is suitable for continuous operation of motor housing flange welding.

[0043] Example 2: The upper clamping member 33 is provided with an upper stepped groove 331 at a lower position; the upper clamping member 33 is provided with an upper pressing groove 332 that runs radially through the upper plate 5; the upper pressing groove 332 runs downward and its inner wall is rotatably connected to the upper rotating shaft 333; the outer wall of the upper rotating shaft 333 is fixedly connected to the upper rotating bar 334; the upper rotating shaft 333 is driven by the upper motor 335 (the output end of the upper motor 335 is fixedly connected to the upper rotating shaft 333, and the housing of the upper motor 335 is fixedly connected to the upper clamping member 33). (Continued); The lower clamping member 62 is provided with a lower step groove 621 at the upper position; The lower clamping member 62 is provided with a lower pressing groove 622 that runs through the lower ring disc 6 radially; The lower pressing groove 622 runs through upward and its inner wall is rotatably connected to the lower rotating shaft 623; The lower rotating shaft 623 is fixedly connected to the lower rotating bar 624 on its outer wall; The lower rotating shaft 623 is driven by the lower motor 625 (the output end of the lower motor 625 is fixedly connected to the lower rotating shaft 623, and the housing of the lower motor 625 is fixedly connected to the lower clamping member 62).

[0044] In this embodiment, the lower surface of the upper plate 5 is provided with an inverted isosceles trapezoidal groove 51 along the radial direction; an inverted isosceles trapezoidal strip 52 fixedly connected to the upper clamping member 33 is slidably connected in the inverted isosceles trapezoidal groove 51; the upper surface of the lower ring plate 6 is provided with a regular isosceles trapezoidal groove 63 along the radial direction; a regular isosceles trapezoidal strip 64 fixedly connected to the lower clamping member 62 is slidably connected in the regular isosceles trapezoidal groove 63.

[0045] After the workpiece is fitted into the fixture and the fixture is vertically unfolded under the weight of the workpiece, the upper electric push rod 32 drives the upper clamping member 33 to move radially outward along the upper plate 5. The upper step groove 331 of the upper clamping member 33 abuts against the inner step of the upper flange, completing the radial and axial limiting of the upper flange. Then, the upper motor 335 drives the upper rotating shaft 333 to rotate, causing the upper rotating bar 334 to rotate and flip. The upper rotating bar 334 rotates outward and abuts against the upper part of the inner wall of the motor housing, realizing the inner abutment and positioning of the upper part of the motor housing. Correspondingly, the lower electric push rod 61 drives the lower clamping member 62 to move radially outward along the lower ring plate 6. The lower step groove 621 of the lower clamping member 62 abuts against the inner step of the lower flange, completing the radial and axial limiting of the lower flange.

[0046] The lower motor 625 drives the lower rotating shaft 623 to rotate, causing the lower rotating bar 624 to flip and extend to press against the lower part of the inner wall of the motor housing, thereby achieving tight positioning of the lower inner side of the motor housing. After the axial limit of the motor housing and the upper and lower flanges, the positioning fixture cannot be folded in the vertical direction during the welding process, making the entire welding process more stable.

[0047] During the radial extension and retraction of the upper clamping member 33, the inverted isosceles trapezoidal strip 52 connected to the upper clamping member 33 slides radially along the inverted isosceles trapezoidal groove 51 on the lower surface of the upper disk 5; when the lower clamping member 62 extends and retracts radially, the regular isosceles trapezoidal strip 64 connected to the lower clamping member 62 slides radially along the regular isosceles trapezoidal groove 63 on the upper surface of the lower ring disk 6. The inverted isosceles trapezoidal strip 52 and the inverted isosceles trapezoidal groove 51, and the regular isosceles trapezoidal strip 64 and the regular isosceles trapezoidal groove 63 cooperate with each other. The upper clamping member 33 and the lower clamping member 62 are guided and limited to prevent them from shifting or jamming. After the welding operation is completed, the upper motor 335 and the lower motor 625 rotate in opposite directions, driving the upper rotating bar 334 and the lower rotating bar 624 to retract. The upper electric push rod 32 and the lower electric push rod 61 drive the upper clamping member 33 and the lower clamping member 62 to retract radially, releasing the clamping of the workpiece. The workpiece is then hoisted and removed.

[0048] The present invention uses the upper step groove 331 and the lower step groove 621 to limit the upper and lower flanges radially and axially, respectively. In addition, the upper rotating bar 334 and the lower rotating bar 624 rotate and press against the inner wall of the motor housing, thereby achieving radial and axial positioning of the flange and pressing against the inner wall of the housing. This avoids the flange and housing from moving or deflecting during the welding process, and further ensures the concentricity of the welding.

[0049] Example 3: The upper plate 5 is provided with an upper annular groove 53 inside; an upper gear ring 54 is rotatably connected in the upper annular groove 53; an upper rotating groove 55 is provided through the upper annular groove 53 downward; an upper gear 56 is rotatably connected in the upper rotating groove 55; all the upper gears 56 mesh with the upper gear ring 54; an upper tooth 57 is provided on one side of the upper clamping member 33 near the upper plate 5; the upper gear 56 meshes with the upper tooth 57 on the corresponding upper clamping member 33.

[0050] In this embodiment, the lower annular disk 6 has a lower annular groove 65 inside; a lower gear ring 66 is rotatably connected inside the lower annular groove 65; a lower rotating groove 67 is provided through the lower annular groove 65 facing upward; a lower gear 68 is rotatably connected inside the lower rotating groove 67; all the lower gears 68 mesh with the lower gear ring 66; a lower tooth 69 is provided on one side of the lower clamping member 62 near the lower annular disk 6; the lower gear 68 meshes with the lower tooth 69 on the corresponding lower clamping member 62.

[0051] When the upper electric push rod 32 drives the upper clamping member 33 to expand radially outward along the upper plate 5 to clamp the workpiece, the upper teeth 57 on one side of the upper clamping member 33 drive the corresponding upper gear 56 to rotate; all the upper gears 56 mesh with the upper gear ring 54, and the upper gear ring 54 rotates inside the upper annular groove 53. Under the synchronous constraint of the upper gear ring 54, the rotation angle of all the upper gears 56 is consistent, so that the displacement of all the upper clamping members 33 extending radially outward is exactly the same, ensuring that each upper clamping member 33 is synchronously and equidistantly clamped, so that the center of the upper flange coincides with the center of the upper plate 5.

[0052] Similarly, when the lower electric push rod 61 drives the lower clamping member 62 to expand radially outward, the lower teeth 69 on the side of the lower clamping member 62 drive the corresponding lower gear 68 to rotate. All the lower gears 68 mesh with the lower gear ring 66, and the lower gear ring 66 rotates in the lower annular groove 65, constraining all the lower gears 68 to rotate at the same angle. All the lower clamping members 62 extend outward with the same displacement, ensuring that the center of the lower flange and the center of the lower ring plate 6 coincide. Since the upper plate 5 and the lower ring plate 6 are coaxially arranged, the coaxial positioning of the upper and lower flanges to be welded is finally achieved. When the clamping is released, the upper electric push rod 32 and the lower electric push rod 61 drive the upper clamping member 33 and the lower clamping member 62 to retract inward. The upper teeth 57 and the lower teeth 69 drive the upper gear 56, the lower gear 68, the upper gear ring 54, and the lower gear ring 66 to rotate in the opposite direction. All the upper clamping members 33 retract synchronously, and all the lower clamping members 62 retract synchronously.

[0053] This invention utilizes the meshing transmission between the upper gear ring 54 and multiple sets of upper gears 56 to achieve synchronous and equidistant radial extension and retraction of all upper clamping parts 33, and utilizes the meshing transmission between the lower gear ring 66 and multiple sets of lower gears 68 to achieve synchronous and equidistant radial extension and retraction of all lower clamping parts 62. This avoids flange eccentricity caused by inconsistent extension of each upper clamping part 33 or each lower clamping part 62, and further ensures the concentricity accuracy of the upper and lower flange assembly and welding. The upper clamping parts 33 and lower clamping parts 62 can be adapted to the centering clamping of flanges of various diameters and specifications, improving the versatility of the tooling.

[0054] Example 4: The lower guide wheel 26 is rotatably connected to the lower part of the inner wall of the transmission groove 21; the second pull rope 27 passes around the lower guide wheel 26; one end of the second pull rope 27 is connected to the lower surface of the inner transmission block 23, and the other end is connected to the lower surface of the outer transmission block 24.

[0055] A lower guide wheel 26 is rotatably mounted on the lower part of the inner wall of the transmission groove 21. A second pull rope 27 passes around the lower guide wheel 26. One end of the second pull rope 27 is connected to the lower surface of the inner transmission block 23, and the other end is connected to the lower surface of the outer transmission block 24. Together with the first pull rope 25 and the upper guide wheel 22, it forms a closed-loop rope transmission structure. When the workpiece's gravity presses down on the lower ring disc 6, causing the outer transmission block 24 to move downward, the first pull rope 25 pulls the inner transmission block 23 upward. At the same time, the second pull rope 27 follows the movement, changing direction around the lower guide wheel 26 and moving upward towards the inner transmission block 23. 3. The movement of the outer transmission block 24 forms a synchronous constraint; when the tension spring 4 pulls the upper column 3 downward to retract, causing the inner transmission block 23 to move downward, the closed-loop pull rope transmission synchronously drives the outer transmission block 24 to reset upward; during the entire movement process, the first pull rope 25, the second pull rope 27, the upper guide wheel 22, and the lower guide wheel 26 form a closed-loop transmission circuit, which constrains the bidirectional movement of the inner transmission block 23 and the outer transmission block 24; the tension spring 4 in this invention can be replaced by a hydraulic cylinder or other structure, and the extension and retraction of the hydraulic cylinder can be used to drive the upper column 3 to move up and down.

[0056] Example 5: The upper column 3 has a limiting groove 34 on its vertical outer wall; a limiting rod 35 is movably connected in the limiting groove 34; the lower cylinder 2 has a first adjusting groove 28 on its vertical inner wall; the first adjusting groove 28 is slidably connected to a first adjusting block 281 fixed to the limiting rod 35; the first adjusting block 281 extends vertically and is threadedly connected to a first screw 282; the upper end of the first screw 282 protrudes from the lower cylinder 2 and is rotatably connected to the lower cylinder 2.

[0057] The upper end of the first screw 282 can be set to an internal hexagonal head or an external hexagonal head. Using a wrench, the first screw 282 is rotated. When the operator rotates the first screw 282, the first adjusting block 281 is driven to move up and down along the first adjusting groove 28 by means of thread transmission. At the same time, the limiting rod 35 is driven to change its vertical height. The limit position of the limiting rod 35 in the limiting groove 34 changes, thereby limiting the maximum stroke of the upper column 3 to slide upward.

[0058] When the limit bar 35 is raised, the maximum upward stroke of the upper column 3 increases, and the vertical unfolding height of the fixture is greater, making it suitable for motor housings and flanges with greater height. When the limit bar 35 is lowered, the maximum upward stroke of the upper column 3 decreases, and the maximum unfolding height of the fixture is reduced, making it suitable for motor housings and flanges with smaller height. This invention can change the maximum upward stroke of the upper column 3 and adjust the maximum unfolding height of the fixture by rotating the first screw 282 to adjust the vertical position of the limit bar 35, thereby adapting to welding and positioning of motor housings and flanges of different heights and expanding the range of workpieces that the fixture can adapt to. The thread of the first screw 282 is self-locking, and the position of the limit bar 35 can be stably maintained after adjustment, making the adjustment operation simple and convenient.

[0059] Example 6: A groove 36 is provided on the lower surface of the upper column 3; a pull plate 37 is provided on the inner wall of the groove 36; the upper end of the tension spring 4 is fixedly connected to the pull plate 37, and the lower end of the tension spring 4 is fixedly connected to the inner bottom wall of the lower cylinder 2.

[0060] In this embodiment, the vertical inner wall of the pull groove 36 is provided with a second adjustment groove 38; the second adjustment block 39, which is fixedly connected to the pull plate 37, is slidably connected up and down in the second adjustment groove 38; the second adjustment block 39 passes through the top and bottom and is threadedly connected to the second screw 391; the upper end of the second screw 391 extends into the cross groove 31; the second screw 391 is rotatably connected to the upper column 3.

[0061] The upper end of the second screw 391 can adopt an internal hexagon or external hexagon structure for easy wrench operation. In use, the second screw 391 is rotated with the help of a wrench, and the threaded transmission drives the second adjusting block 39 to move up and down along the second adjusting groove 38. The second adjusting block 39 drives the pull plate 37 to slide inside the pull groove 36, thereby changing the vertical position and thus changing the initial pretension of the tension spring 4: adjusting the pull plate 37 upward increases the pretension of the tension spring 4 and the initial tension increases; adjusting the pull plate 37 downward decreases the pretension of the tension spring 4 and the initial tension decreases. For lighter motor housing workpieces, the pretension of the tension spring 4 can be reduced to prevent the initial tension of the tension spring 4 from being too large, so that the workpiece's own weight is insufficient to overcome the elastic force of the tension spring 4 and the tooling cannot be properly unfolded. For heavier housing workpieces, the pretension of the tension spring 4 can be appropriately increased so that after the workpiece is lifted and the load is unloaded, the tension spring 4 can reliably pull the upper column 3 to complete the retraction and reset. The tension of the tension spring 4 is matched with the weight of the workpiece, thereby achieving slow placement of the workpiece to achieve buffering.

[0062] This invention adjusts the vertical position of the pull plate 37 by rotating the second screw 391, thereby making the initial preload of the tension spring 4 adjustable. This allows it to be matched with motor housings and flange workpieces of different weights. It avoids the situation where the workpiece's own weight is insufficient to overcome the spring preload, preventing the tooling from being unable to unfold, while ensuring that the tooling can retract smoothly after unloading heavy workpieces. The upper end of the second screw 391 is arranged in the cross groove 31, which facilitates direct operation by inserting a wrench into the cross groove 31, making adjustment convenient.

[0063] Example 7: A bottom motor 12 is embedded in the upper surface of the welding station 1; the output end of the bottom motor 12 is fixed to the lower surface of the lower cylinder 2; the lower surface of the lower cylinder 2 is connected to the welding station 1 through a plane bearing 13.

[0064] Once the workpiece is clamped and positioned, and the concentricity of the upper and lower flanges meets the welding requirements, the welding equipment is kept in a fixed position. The bottom motor 12 is started, and the bottom motor 12 drives the lower cylinder 2 to rotate. The plane bearing 13 bears the load of the lower cylinder 2, the upper column 3, and the workpiece, reducing rotational friction. The rotation of the lower cylinder 2 drives the upper column 3, the upper plate 5, the lower ring plate 6, and the clamped and fixed motor housing and flange to rotate synchronously. The workpiece rotates at a uniform speed with the tooling, and the welding mechanism welds the flange weld at a fixed point. After welding is completed, the bottom motor 12 is stopped, the tooling stops rotating, and the clamping is released and the workpiece is lifted.

[0065] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 2 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first," "second," "third," etc. are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, "fixed connection" refers to a fixed connection. In the description of the present invention, "sliding connection" refers to a connection where the two parts can only slide and cannot be separated. Specifically, the groove can be set to be concave and the block can be set to be convex, and the specific design can be adjusted according to the actual situation. "Sliding fit" refers to a connection where the two parts can slide and separate. In the description of the present invention, "rotational connection" refers to a connection where the two parts can only rotate and cannot produce axial displacement. Specifically, an annular groove can be set on the inner wall of the hole, and a ring that is rotatably connected to the groove can be fixed to the outer wall of the shaft.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning fixture for flange welding assembly, comprising a welding table and legs fixedly connected to the lower surface of the welding table; characterized in that: The welding platform has an upward-opening lower cylinder on its upper surface; an upper column is slidably connected to the inner side of the single-opening lower cylinder; the lower surface of the upper column is connected to the inner bottom wall of the lower cylinder by a tension spring; a cross groove is provided on the upper surface of the upper column and is fixedly connected to an upper plate; an upper electric push rod is fixedly connected to the upper plate on the inner side of the cross groove; an upper clamping member is fixedly connected to the output end of the upper electric push rod; a transmission groove is provided through the inner and outer walls of the lower cylinder; an upper guide wheel is rotatably connected to the upper position of the inner wall of the transmission groove; an inner transmission block and an outer transmission block are movably connected to the inner side of the transmission groove and below the upper guide wheel; a first pull rope is fixedly connected to the upper surface of the inner transmission block; the other end of the first pull rope is upward-facing, passes over the upper guide wheel, and is fixedly connected to the upper surface of the outer transmission block; the inner transmission block is fixedly connected to the lower position of the upper column; a lower ring plate is slidably connected to the outer wall of the lower cylinder and is fixedly connected to the outer transmission block; a lower electric push rod is fixedly connected to the upper surface of the lower ring plate; a lower clamping member is fixedly connected to the output end of the lower electric push rod.

2. The positioning fixture for flange welding assembly according to claim 1, characterized in that: The upper clamping member has an upper stepped groove at its lower position; the upper clamping member has an upper pressing groove that extends radially through the upper disc; the upper pressing groove extends downward and its inner wall is rotatably connected to an upper rotating shaft; the outer wall of the upper rotating shaft is fixedly connected to an upper rotating bar; the upper rotating shaft is driven by an upper motor; the lower clamping member has a lower stepped groove at its upper position; the lower clamping member has a lower pressing groove that extends radially through the lower annular disc; the lower pressing groove extends upward and its inner wall is rotatably connected to a lower rotating shaft; the outer wall of the lower rotating shaft is fixedly connected to a lower rotating bar; the lower rotating shaft is driven by a lower motor.

3. A positioning fixture for flange welding assembly according to claim 2, characterized in that: The lower surface of the upper plate is provided with an inverted isosceles trapezoidal groove along the radial direction; an inverted isosceles trapezoidal strip fixed to the upper clamping member is slidably connected in the inverted isosceles trapezoidal groove; the upper surface of the lower ring plate is provided with a regular isosceles trapezoidal groove along the radial direction; a regular isosceles trapezoidal strip fixed to the lower clamping member is slidably connected in the regular isosceles trapezoidal groove.

4. A positioning fixture for flange welding assembly according to claim 3, characterized in that: The upper plate has an upper annular groove inside; an upper gear ring is rotatably connected in the upper annular groove; an upper rotating groove is provided downward through the upper annular groove; an upper gear is rotatably connected in the upper rotating groove; all the upper gears mesh with the upper gear ring; an upper tooth is provided on one side of the upper clamping member near the upper plate; the upper gear meshes with the upper tooth on the corresponding upper clamping member.

5. A positioning fixture for flange welding assembly according to claim 4, characterized in that: The lower ring disk has a lower annular groove inside; a lower gear ring is rotatably connected in the lower annular groove; a lower rotating groove is provided through the lower annular groove facing upward; a lower gear is rotatably connected in the lower rotating groove; all the lower gears mesh with the lower gear ring; a lower tooth is provided on one side of the lower clamping member near the lower ring disk; the lower gear meshes with the lower tooth on the corresponding lower clamping member.

6. A positioning fixture for flange welding assembly according to claim 1, characterized in that: The lower guide wheel is rotatably connected to the lower part of the inner wall of the transmission groove; a second pull rope passes around the lower guide wheel; one end of the second pull rope is connected to the lower surface of the inner transmission block, and the other end is connected to the lower surface of the outer transmission block.

7. A positioning fixture for flange welding assembly according to claim 1, characterized in that: The upper column has a limiting groove on its vertical outer wall; a limiting rod is movably connected in the limiting groove; the lower cylinder has a first adjusting groove on its vertical inner wall; the first adjusting groove is slidably connected to a first adjusting block that is fixed to the limiting rod; the first adjusting block runs vertically through the cylinder and is threadedly connected to a first screw; the upper end of the first screw protrudes from the lower cylinder and is rotatably connected to the lower cylinder.

8. A positioning fixture for flange welding assembly according to claim 1, characterized in that: The upper column has a groove on its lower surface; the inner wall of the groove has a pull plate; the upper end of the tension spring is fixed to the pull plate, and the lower end of the tension spring is fixed to the bottom wall of the lower cylinder.

9. A positioning fixture for flange welding assembly according to claim 8, characterized in that: The vertical inner wall of the pull groove is provided with a second adjustment groove; a second adjustment block that is fixedly connected to the pull plate is slidably connected up and down in the second adjustment groove; the second adjustment block runs through the top and bottom and is threadedly connected to a second screw; the upper end of the second screw extends into the cross groove; the second screw is rotatably connected to the upper column.

10. A positioning fixture for flange welding assembly according to claim 1, characterized in that: A bottom motor is embedded in the upper surface of the welding platform; the output end of the bottom motor is fixed to the lower surface of the lower cylinder; the lower surface of the lower cylinder is connected to the welding platform through a plane bearing.

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