A transformer oil tank welding device and welding method

Abstract

The application discloses a transformer oil tank welding device and a welding method, which comprise a workbench and a top plate, a rotating plate is rotationally connected below the top plate, a positioning rod is connected to the middle of the rotating plate, two first vertical telescopic rods are symmetrically arranged on the left and right sides below the rotating plate, arc clamping blocks are connected to the inner sides of the first vertical telescopic rods through horizontal telescopic rods, a semicircular ring gear is rotationally connected below the arc clamping blocks, a first welding gun is arranged below the semicircular ring gear, a bottom grinding block is connected below the arc clamping blocks, a sealing rubber tube, a limiting grinding block, a second welding gun and a heat conduction hole are arranged on the positioning rod; through the above arrangement, the simultaneous positioning and welding of the oil inlet pipes and the oil tank plates and flanges can be simultaneously completed, the simultaneous sealing of the oil inlet pipes and the oil tank plates can be completed at the same time of welding, the operation steps are reduced, the functional utilization of each structure is improved, the structure is compact, the two welding positions are associated through the heat conduction hole, are mutually preheated and are slowly cooled, and therefore the welding cold cracks are reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil tank welding, in particular to a transformer oil tank welding device and welding method. BACKGROUND

[0002] The transformer oil tank is provided with an oil inlet, and the oil inlet of the transformer is provided with an oil inlet pipe which needs to be welded on the oil inlet. When the oil inlet pipe is welded, the flange is first welded on the end of the oil inlet pipe, and then the other end of the oil inlet pipe is welded on the transformer oil tank. After the welding is completed, the welded seam needs to be manually polished. In addition, the oil inlet pipe and the flange need to be fixed and positioned separately during the welding of the oil inlet pipe and the welding of the flange. After the welding is completed, the fixing is removed, then the oil inlet pipe is turned over, and the oil inlet pipe is positioned and clamped for welding. The operation steps are relatively complex, which wastes manpower and material resources, and the overall efficiency is low. SUMMARY

[0003] In view of the deficiencies and shortcomings in the prior art, the purpose of the present application is to provide a transformer oil tank welding device and welding method, which solves the problem of the transformer oil tank welding device in the prior art that the oil inlet pipe and the flange need to be fixed and positioned separately, the fixing is removed after the welding is completed, then the oil inlet pipe is turned over, and the oil inlet pipe is positioned and clamped, the operation steps are relatively complex, which wastes manpower and material resources, and the overall efficiency is low.

[0004] In order to solve the above technical problems, the present application adopts the following technical scheme: a transformer oil tank welding device for welding flanges, oil inlet pipes and oil tank plates, comprising a first welding gun and a workbench, a top plate is connected to the workbench through a support rod, a rotating plate is rotatably connected below the top plate, a positioning rod that can be lifted and rotated is connected to the middle of the rotating plate, the diameter of the positioning rod is smaller than the inner diameter of the oil inlet pipe, a cleaning brush strip that can clean the oil inlet pipe is arranged on one side of the positioning rod, two first vertical telescopic rods are symmetrically arranged on the left and right sides below the rotating plate, an arc clamping block is connected to the inner side of each first vertical telescopic rod through a horizontal telescopic rod, a semicircular ring gear is rotatably connected below each arc clamping block, the two semicircular ring gears can be combined into a circular ring gear, one of the semicircular ring gears is connected with a driving mechanism that drives it to rotate, the first welding gun is arranged below the semicircular ring gear, a fourth vertical telescopic rod is connected to a bottom grinding block below each arc clamping block, the cross-sectional shape of the bottom grinding block is arc-shaped, when the arc clamping block clamps the flange, the bottom grinding block clamps the oil inlet pipe, a ring groove is arranged at the position corresponding to the welding seam of the oil inlet pipe and the oil tank plate, a sealing rubber tube is arranged in the ring groove, a "7" shaped limiting grinding block is arranged on the positioning rod, the limiting grinding block is used for limiting the oil inlet pipe and the flange, a recess is arranged on the positioning rod, a second welding gun is arranged in the recess, the second welding gun is used for welding the oil inlet pipe and the flange, the second welding gun is aligned with the butt joint position of the top end of the oil inlet pipe and the inner side of the flange, a scrap absorber is arranged below the semicircular ring gear; a heat conduction hole is arranged on the positioning rod at the position of the second welding gun, and the other end of the heat conduction hole is communicated with the ring groove.

[0005] As a further improvement of the present application, a solder paste gun, a soldering iron and a grinding head are sequentially arranged on one side of the sealing rubber tube in the ring groove.

[0006] As a further improvement of the present application, the solder paste gun comprises a push tube, a push piston is arranged in the push tube, and the push piston is detachably connected with a motor-driven push rod that drives it to push and pull.

[0007] As a further improvement of the present application, a heat conduction rod is arranged in the heat conduction hole.

[0008] As a further improvement of the present application, a positioning groove that can clamp the oil tank plate is arranged on the workbench.

[0009] As a further improvement of the present application, the driving mechanism comprises a first motor, the output shaft of the first motor is connected with a pinion, the first motor is fixed on one of the first vertical telescopic rods, and the pinion is engaged with the semicircular ring gear.

[0010] As a further improvement of the present application, a second motor is arranged above the top plate, the output shaft of the second motor penetrates through the top plate and is connected with the rotating plate.

[0011] As a further improvement of the present application, a third motor is arranged below the rotating plate, and the bottom of the output shaft of the third motor is provided with a third vertical telescopic rod, which is connected with the positioning rod.

[0012] The welding method using the transformer oil tank welding device comprises the following steps:

[0013] (1) Preparation: Place the oil tank plate on the workbench, put the oil inlet pipe on the positioning rod, and put the flange outside the oil inlet pipe. The top of the oil inlet pipe and the flange are both pressed against the limiting grinding block. Adjust the first vertical telescopic rod and the horizontal telescopic rod so that the arc-shaped clamping block clamps the flange and the bottom grinding block presses against the oil inlet pipe. Adjust the fourth vertical telescopic rod so that the bottom grinding block is flush with the bottom of the oil inlet pipe. Jointly adjust the first vertical telescopic rod and the third vertical telescopic rod so that the bottom grinding block and the bottom of the oil inlet pipe are pressed against the oil tank plate. At this time, the positioning rod is inserted into the oil inlet hole on the oil tank plate.

[0014] (2) Grinding: Rotate the rotating plate while reversely rotating the positioning rod. The rotating plate drives the arc-shaped clamping block, the flange, the oil inlet pipe, and the positioning rod to rotate together. In the process of rotation, the bottom grinding block rubs and grinds the oil tank plate, the oil inlet pipe rubs and grinds the oil tank plate, the positioning rod sweeps the oil inlet pipe, and the limiting grinding block grinds the end of the oil inlet pipe and the flange. Jointly adjust the first vertical telescopic rod and the third vertical telescopic rod upward so that the bottom grinding block and the bottom of the oil inlet pipe are away from the oil tank plate.

[0015] (3) Dust absorption: Turn on the dust collector to absorb the ground iron filings.

[0016] (4) Welding: Jointly adjust the first vertical telescopic rod and the third vertical telescopic rod downward so that the positioning rod is inserted into the oil inlet hole of the oil tank plate and the oil inlet pipe is pressed against the oil inlet hole of the oil tank plate. Adjust the fourth vertical telescopic rod upward so that the bottom of the bottom grinding block is away from the oil tank plate. Adjust the positioning rod upward so that the limiting grinding block is away from the end of the oil inlet pipe. Rotate the semicircular ring gear and the positioning rod. The rotation of the semicircular ring gear drives the first welding gun to rotate, and the rotation of the positioning rod drives the second welding gun and the sealing rubber tube to rotate. At the same time, turn on the first welding gun, the second welding gun, and the sealing rubber tube. The first welding gun welds the oil inlet pipe and the oil tank plate outside the oil inlet pipe. The second welding gun welds the oil inlet pipe and the flange at the upper end of the oil inlet pipe. The sealing glue extruded by the sealing rubber tube seals and bonds the joint between the oil inlet pipe and the oil tank plate inside the oil inlet pipe. In the process of welding by the first welding gun, the welding heat is conducted to the sealing rubber tube inside the oil inlet pipe, causing the sealing glue to melt and penetrate into the gap between the oil inlet pipe and the oil tank plate for bonding and sealing. In the process of welding by the second welding gun, the welding heat is conducted to the annular groove through the heat conduction hole, preheating the joint between the oil inlet pipe and the oil tank plate. The welding heat at the first welding gun is conducted to the position of the second welding gun through the heat conduction hole, preheating the welding position of the oil inlet pipe and the flange to prevent cold cracking.

[0017] (5) weld polishing: adjust the bottom grinding block and the positioning rod downward, and rotate the semicircular ring gear and the positioning rod, the bottom grinding block rotates and polishes the weld on the outside bottom of the oil inlet pipe, and the limiting grinding block rotates and polishes the inner weld at the oil inlet pipe and the flange;

[0018] (6) unloading: the first vertical telescopic rod is retracted upward, driving the welded flange, oil inlet pipe and oil tank bottom plate to move upward, the positioning rod moves upward, so that the positioning rod is extracted from the oil inlet pipe, and then the horizontal telescopic rod is adjusted to loosen the flange, and the oil tank bottom plate is taken away.

[0019] As a further improvement of the application, between step (5) and step (6), the following step is further included: detecting the welding strength: the second motor is turned on, the second motor gives the rotating plate a rotating force, if the flange falls off from the oil inlet pipe, it indicates that the welding strength of the flange and the oil inlet pipe is not enough, otherwise it indicates that the welding strength between the flange and the oil inlet pipe meets the initial detection, if the oil inlet pipe falls off from the oil tank plate, it indicates that the welding strength of the oil inlet pipe and the oil tank plate is not enough, otherwise it indicates that the welding strength of the oil inlet pipe and the oil tank plate meets the initial detection.

[0020] Compared with the prior art, the application has the following advantages:

[0021] 1. By setting the rotating plate, the first vertical telescopic rod, the second vertical telescopic rod, the positioning rod, the bottom block, the arc-shaped clamping block, the semicircular ring gear, the limiting grinding block, the first welding gun, the second welding gun, the blood suction device and the sealing rubber tube, the heat conduction hole is arranged in the positioning rod, so that when welding, the oil tank plate is placed on the workbench, the oil inlet pipe is sleeved on the positioning rod, then the flange is sleeved on the top outside of the oil inlet pipe, and the limiting grinding block on the positioning rod is used for limiting positioning, then the bottom of the oil inlet pipe is pressed on the oil inlet hole, and the positioning, clamping and fixing of the oil tank plate, the oil inlet pipe and the flange are completed.

[0022] Then rotate the rotating plate and reverse the rotating positioning rod, the rotating plate can drive the flange and the oil inlet pipe to rotate, when the oil inlet pipe rotates, the bottom of the oil inlet pipe and the oil tank plate rub against each other, and the rust and burrs are polished off, so that the contact surface between the end of the oil inlet pipe and the oil tank plate is more flat and fits together, when the oil inlet pipe and the oil tank plate are butt welded, the contact gap is reduced, the sealing performance is improved, and this operation can simultaneously polish the two butt surfaces, and the oil inlet pipe and the oil tank plate are polished against each other, so that the cooperation is better; in addition, when the bottom grinding block rotates, the bottom grinding block polishes the surface of the oil tank plate on the outside of the oil inlet pipe, and the rust and dirt are polished off, so that the cleanliness of the welding seam is improved, the subsequent welding strength is improved, and the problem of firm welding is avoided; in addition, at the same time, when the flange and the oil inlet pipe rotate, the limiting module on the positioning rod can polish the end of the oil inlet pipe and the inside of the flange, so that the cleanliness of the welding position is improved, the subsequent welding strength is improved, the limiting module simultaneously plays the dual role of limiting positioning and polishing the welding position, one structure has multiple scene functions, and the functionality is relatively strong, in addition, the polishing cooperation between the oil inlet pipe and the oil tank plate, the polishing of the outside of the oil inlet pipe on the oil tank plate, and the polishing of the butt joint of the inside of the flange and the oil inlet pipe can be simultaneously completed, and the overall operation efficiency is relatively high; in addition, the welding joint of the oil inlet pipe, the oil tank plate and the flange is polished, the welding joint is heated during polishing, so that the preheating of the welding joint is completed, and welding cracks are prevented, this welding preheating method by polishing has the advantages that a special heating mechanism does not need to be arranged, the structure is simpler, and the preheating and polishing steps can be superimposed, the operation steps are simplified, and the overall operation efficiency is relatively high.

[0023] After polishing is completed, iron filings polished off are adsorbed by the scrap absorber, and the welding position is kept clean.

[0024] After the iron filings are absorbed, the first welding gun welds the oil inlet pipe and the oil tank plate together at the bottom outside of the oil inlet pipe, simultaneously, the second welding gun welds the oil inlet pipe and the flange together at the upper end of the oil inlet pipe and the inside of the flange, simultaneously, the sealing rubber tube is bonded and sealed at the butt joint between the inside of the oil inlet pipe and the inside of the oil tank plate, the welding heat of the first welding gun on the outside can make the sealing rubber melt more easily, the sealing rubber can penetrate into the gap between the oil inlet pipe and the oil tank plate, the sealing effect is better, and oil leakage is prevented, the bonding and sealing of the sealing rubber make full use of the welding heat during welding, welding and rubber coating are interrelated and complementary, and the operation is simple and convenient.

[0025] In addition, during welding, the welding of the bottom end of the oil inlet pipe and the welding of the upper end of the oil inlet pipe can exchange heat through the heat conduction holes, welding preheating can be completed during welding, the welding seam can be slowly cooled, welding cracks are reduced, the two weldings can interact and utilize each other, and the welding quality is improved.

[0026] After the welding is completed, the bottom grinding block and the limiting grinding block are adjusted to polish the weld to improve the smoothness of the weld, the bottom grinding block and the limiting grinding block polish the welding position before welding, and the weld is polished after the welding is completed, which is used for polishing work in different processes and has strong effect, the oil inlet pipe, the flange and the oil tank plate are only positioned and clamped once, and the overall efficiency is higher.

[0027] After the welding and the weld polishing are completed, the rotating rotating plate can be rotated to detect the torsional strength of the welding to complete the preliminary detection of the welding.

[0028] 2. By arranging the solder paste glue gun, the electric soldering iron and the grinding head in the ring groove on one side of the sealing rubber tube in sequence, the oil inlet pipe and the oil tank plate can be welded by using the solder paste and the electric soldering iron on the inner side of the oil inlet pipe, and then the sealing glue is applied for sealing, so that the connection strength and the sealing effect are better.

[0029] 3. By arranging the heat conducting rod in the heat conducting hole, the welding heat conduction can be better.

[0030] 4. By arranging the positioning groove on the workbench, the oil tank plate can be positioned and clamped.

[0031] 5. By arranging the driving mechanism as the first motor, the pinion and the first vertical telescopic rod, the first motor can drive the pinion to rotate, the pinion drives the semicircular ring gear to rotate in the process of rotating, and the semicircular ring gear drives the rotation of the other semicircular ring gear when rotating, so as to drive the bottom grinding block and the first welding gun to rotate.

[0032] 6. The welding method of the transformer oil tank welding device can complete the positioning and clamping of the flange, the oil inlet pipe and the oil tank plate, the polishing of the welding position, the welding, the polishing of the weld and the unloading process. By positioning and clamping once, the polishing, chip removal, welding and polishing of the weld of multiple welding positions can be completed synchronously, the overall welding steps are simplified, and the welding efficiency is improved. In addition, in the process of polishing the welding position, the welding position can be preheated synchronously, the work characteristic of generating heat by polishing friction is utilized, and the subsequent weld cracks are reduced. In the process of welding the outer side of the bottom of the oil inlet pipe, the inner side of the bottom of the oil inlet pipe is coated with sealing glue at the same time, and in the process of coating the sealing glue, the heat of the outer side of the oil inlet pipe and the welding heat of the welding position at the top of the oil inlet pipe can be fully utilized, so that the sealing glue can melt and penetrate into the gap between the oil inlet pipe and the oil tank plate, the sealing and bonding effect is improved, and the oil liquid is prevented from penetrating into the gap between the oil inlet pipe and the oil tank plate to cause corrosion and leakage. In addition, in the welding process of the upper end and the lower end of the oil inlet pipe, the welding heat can be transmitted and affected, so that the welding position can be preheated, the weld after welding can be slowly cooled, the welding cracks are reduced, the welding quality is improved, the cracks are improved, and multiple welding positions are associated.

[0033] 7. By adding a step to test the welding strength between steps (5) and (6), the welded parts do not need to be repositioned after welding, nor is it necessary to set up a special testing mechanism. The welding strength of the welded parts can be tested using the existing welding structure. The structure is simple, practical and convenient, and simplifies the welding strength testing steps. Attached Figure Description

[0034] The invention will now be further described with reference to the accompanying drawings:

[0035] Figure 1 This is a schematic diagram of the structure of the present invention;

[0036] Figure 2 for Figure 1 A sectional view;

[0037] Figure 3 for Figure 2 Enlarged view at point A;

[0038] Figure 4 This is a schematic diagram of the positioning rod at the annular groove.

[0039] Figure 5 This is a schematic diagram of the solder paste gun assembly.

[0040] In the diagram: 1. Welding flange; 2. Oil inlet pipe; 3. Oil tank plate; 4. First welding torch; 5. Workbench; 6. Support rod; 7. Top plate; 8. Rotating plate; 9. Positioning rod; 10. First vertical telescopic rod; 11. Arc clamping block; 12. Semi-circular ring gear; 13. Bottom grinding block; 14. Ring groove; 15. Sealing hose; 16. Limiting grinding block; 17. Groove; 18. Second welding torch; 19. Chip collector; 20. Heat conduction hole; 21. Positioning groove; 22. First motor; 23. Small gear; 24. Second motor; 25. Third motor; 26. Third vertical telescopic rod; 27. Horizontal telescopic rod; 28. Fourth vertical telescopic rod; 29. ​​Solder paste gun; 30. Soldering iron; 31. Grinding head; 33. Mounting slot; 34. Electric push rod; 35. Push tube; 36. Push piston; 37. Cleaning brush. Detailed Implementation

[0041] The following is in conjunction with the appendix Figures 1-4 The present invention will be described in further detail. For clarity, only structures relevant to the inventive aspects of the invention are shown in the figures.

[0042] For ease of description, the coordinate system is defined as follows: Figure 1 As shown, the left and right directions are horizontal, the front and back directions are vertical, and the up and down directions are vertical.

[0043] This invention discloses a transformer tank welding device. (Refer to...) Figure 1And Figure 2 A transformer oil tank welding device for welding a flange 1, an oil inlet pipe 2 and an oil tank plate 3, comprising a first welding gun 4 and a workbench 5, wherein the workbench 5 is provided with a positioning groove 21 capable of clamping the oil tank plate 3, so that the oil tank plate 3 can be clamped and positioned. A top plate 7 is connected to the workbench 5 through a support rod 6, and a rotating plate 8 is rotatably connected to the bottom of the top plate 7. A second motor 24 is arranged above the top plate 7, and the output shaft of the second motor 24 penetrates the top plate 7 and is connected to the rotating plate 8. The motor drives the rotating plate 8 to rotate.

[0044] A positioning rod 9 capable of lifting and rotating is connected to the middle of the bottom of the rotating plate 8. Specifically, a third motor 25 is arranged at the bottom of the rotating plate 8, and the bottom of the output shaft of the third motor 25 is provided with a third vertical telescopic rod 26, which is connected to the positioning rod 9. The diameter of the positioning rod 9 is smaller than the inner diameter of the oil inlet pipe 2. A cleaning brush strip 37 capable of cleaning the oil inlet pipe 2 is arranged on one side of the positioning rod 9. Two first vertical telescopic rods 10 are symmetrically arranged on the left and right sides of the bottom of the rotating plate 8. The inner sides of the two first vertical telescopic rods 10 are both connected to a circular arc clamping block 11 through a horizontal telescopic rod 27. A semicircular ring gear 12 is rotatably connected to the bottom of each circular arc clamping block 11. For example, a sliding groove is arranged at the bottom of the circular arc clamping block 11, and a sliding block is arranged on the semicircular ring gear 12 and is in sliding fit with the sliding groove, so that the semicircular ring gear 12 can rotate around the circular arc clamping block 11. The two semicircular ring gears 12 can be combined into a circular ring gear. In addition, one of the semicircular ring gears 12 is connected to a driving mechanism for driving it to rotate. Specifically, the driving mechanism comprises a first motor 22, the output shaft of the first motor 22 is connected to a pinion 23, and the first motor 22 is fixed on one of the first vertical telescopic rods 10. The pinion 23 is in mesh with the semicircular ring gear 12. By arranging the driving mechanism as the first motor 22, the pinion 23 and the first vertical telescopic rod 10, the first motor 22 can drive the pinion 23 to rotate, and the pinion 23 drives the semicircular ring gear 12 to rotate in the process of rotating. When the semicircular ring gear 12 rotates, the rotation of the other semicircular ring gear 12 is pushed, so as to drive the bottom grinding block 13 and the first welding gun 4 to rotate.

[0045] The first welding gun 4 is arranged below the semicircular ring gear. The bottom of each circular arc clamping block 11 is connected to a bottom grinding block 13 through a fourth vertical telescopic rod 28. The cross section of the bottom grinding block 13 is arc-shaped. When the circular arc clamping block 11 clamps the flange, the bottom grinding block 13 clamps the oil inlet pipe 2. Figure 2 And Figure 4 As shown in the figure, the positioning rod 9 is provided with a ring groove 14 at the position corresponding to the welding seam of the oil inlet pipe 2 and the oil tank plate 3. A sealing rubber pipe 15 is arranged in the ring groove 14. Figure 3As shown in the drawings, the positioning rod 9 is provided with a "7" shaped limiting grinding block 16, the height difference between the bottom plane of the vertical part of the limiting block and the bottom plane of the horizontal part is equal to the height difference between the upper plane of the welding flange 1 and the upper plane of the end of the oil inlet pipe 2, and the limiting grinding block 16 is used for limiting the oil inlet pipe 2 and the flange.

[0046] As shown in the drawings, the positioning rod 9 is provided with a "7" shaped limiting grinding block 16, the height difference between the bottom plane of the vertical part of the limiting block and the bottom plane of the horizontal part is equal to the height difference between the upper plane of the welding flange 1 and the upper plane of the end of the oil inlet pipe 2, and the limiting grinding block 16 is used for limiting the oil inlet pipe 2 and the flange. Figure 3 As shown in the drawings, the positioning rod 9 is provided with a "7" shaped limiting grinding block 16, the height difference between the bottom plane of the vertical part of the limiting block and the bottom plane of the horizontal part is equal to the height difference between the upper plane of the welding flange 1 and the upper plane of the end of the oil inlet pipe 2, and the limiting grinding block 16 is used for limiting the oil inlet pipe 2 and the flange.

[0047] In addition, as shown in the drawings, the ring groove 14 is sequentially provided with a soldering paste gun 29, an electric soldering iron 30 and a grinding head 31 on one side of the sealing rubber pipe 15, the soldering paste gun 29 can be used to apply soldering paste. Figure 4 Figure 5 In addition, as shown in the drawings, the ring groove 14 is sequentially provided with a soldering paste gun 29, an electric soldering iron 30 and a grinding head 31 on one side of the sealing rubber pipe 15, the soldering paste gun 29 can be used to apply soldering paste.

[0048] In addition, as shown in the drawings, the ring groove 14 is sequentially provided with a soldering paste gun 29, an electric soldering iron 30 and a grinding head 31 on one side of the sealing rubber pipe 15, the soldering paste gun 29 can be used to apply soldering paste.

[0049] The present application is provided with a rotating plate 8, a first vertical telescopic rod 10, a second vertical telescopic rod, a positioning rod 9, a bottom block, an arc-shaped clamping block, a semicircular ring gear 12, a limiting grinding block 16, a first welding gun 4, a second welding gun 18, a blood suction device and a sealing rubber pipe 15, and the positioning rod 9 is provided with a heat conducting hole 20, so that the oil tank plate 3 is placed on the workbench 5, the oil inlet pipe 2 is sleeved on the positioning rod 9, the flange is sleeved on the top of the oil inlet pipe 2, the limiting grinding block 16 on the positioning rod 9 is used for limiting and positioning, the bottom of the oil inlet pipe 2 is pressed on the oil inlet hole, and the positioning, clamping and fixing of the oil tank plate 3, the oil inlet pipe 2 and the flange are completed.​

[0050] Then rotate the rotating plate 8 and reverse the rotating positioning rod 9, the rotating plate 8 can drive the flange and the oil inlet pipe 2 to rotate, when the oil inlet pipe 2 rotates, the bottom of the oil inlet pipe 2 and the oil tank plate 3 rub against each other, grinding off rust and burrs, making the contact surface between the end of the oil inlet pipe 2 and the oil tank plate 3 more flat and fit, reducing the contact gap when the oil inlet pipe 2 and the oil tank plate 3 are butt welded, improving the sealing performance, and this step operation can simultaneously complete the grinding of the two butt surfaces, and the oil inlet pipe 2 and the oil tank plate 3 are mutually ground and polished, better matching, reducing the butt gap; in addition, when the bottom grinding block 13 rotates, the bottom grinding block 13 grinds the upper surface of the oil tank plate 3 on the outside of the oil inlet pipe 2, grinding off the rust and dirt surface, improving the cleanliness of the weld, thereby improving the subsequent weld strength and avoiding the problem of firm welding; at the same time, when the flange and the oil inlet pipe 2 rotate, the limiting module on the positioning rod 9 can grind the inside of the flange and the upper end of the oil inlet pipe 2, improving the cleanliness of the welding area and the subsequent welding strength, the limiting module simultaneously functions as limiting positioning and grinding the welding area, a structure with multiple scene functions and strong functionality, in addition, the grinding and matching of the oil inlet pipe 2 and the oil tank plate 3, the grinding of the outside of the oil inlet pipe 2 on the oil tank plate 3, and the grinding of the inside of the flange and the oil inlet pipe 2 can be completed simultaneously, the overall operation efficiency is high; in addition, by grinding the butt welding area of the oil inlet pipe 2, the oil tank plate 3 and the flange, the oil inlet pipe 2, the oil tank plate 3 and the flange are heated during grinding, thereby completing the preheating of the welding area and preventing welding cracks, this welding preheating method using grinding has the advantages of not needing to specially set a heating mechanism, a simpler structure, and the steps of preheating and grinding can be stacked, the overall operation efficiency is high.

[0051] After grinding is completed, the iron filings ground off are adsorbed by the chip absorber 19 to keep the welding area clean.

[0052] After the iron filings are absorbed, the first welding gun 4 welds the oil inlet pipe 2 and the oil tank plate 3 together on the outside of the bottom of the oil inlet pipe 2, at the same time, the second welding gun 18 welds the oil inlet pipe 2 and the flange together on the inside of the upper end of the oil inlet pipe 2 and the flange, at the same time, the sealing rubber tube 15 is glued to the inside of the oil inlet pipe 2 and the inside of the oil tank plate 3, the welding heat of the first welding gun 4 on the outside during gluing can make the sealing glue melt more, facilitating the penetration of the sealing glue into the gap between the oil inlet pipe 2 and the oil tank plate 3, the sealing effect is better, preventing oil leakage, the gluing of the sealing glue fully utilizes the welding heat during welding, welding and gluing are interrelated and complementary, simple and convenient.

[0053] In addition, in the process of welding, the welding of the bottom end of the oil inlet pipe 2 and the welding of the upper end of the oil inlet pipe 2 can exchange heat through the heat-conducting hole 20, which can preheat the welding position during welding and slowly cool the welding seam to reduce welding cracks, so that the two weldings can interact and improve the welding quality.

[0054] After welding is completed, the bottom grinding block 13 and the limiting grinding block 16 are adjusted to polish the welding seam to improve the smoothness of the welding seam. The bottom grinding block 13 and the limiting grinding block 16 polish the welding position before welding and polish the welding seam after welding, which is used for polishing work in different processes and has strong effectiveness. The oil inlet pipe 2, the flange, and the oil tank plate 3 are only positioned and clamped once, and the overall efficiency is high.

[0055] After welding and welding seam polishing are completed, the rotating rotating plate 8 can be rotated to detect the torsional strength of the welding and complete the preliminary detection of the welding.

[0056] A welding method using a transformer oil tank welding device includes the following steps:

[0057] (1) Preparation: Place the oil tank plate 3 on the workbench 5, put the oil inlet pipe 2 on the positioning rod 9, and put the flange on the outside of the oil inlet pipe 2. The top of the oil inlet pipe 2 and the flange are both on the limiting grinding block 16. Adjust the first vertical telescopic rod 10 and the horizontal telescopic rod 27 so that the circular arc clamping block 11 clamps the flange and the bottom grinding block 13 abuts against the oil inlet pipe 2. Adjust the fourth vertical telescopic rod 28 so that the bottom grinding block 13 is flush with the bottom of the oil inlet pipe 2. Adjust the first vertical telescopic rod 10 and the third vertical telescopic rod 26 together so that the bottom grinding block 13 and the bottom of the oil inlet pipe 2 abut against the oil tank plate 3. At this time, the positioning rod 9 is inserted into the oil inlet hole in the oil tank plate 3.

[0058] (2) Polishing: Rotate the rotating plate 8 while reversely rotating the positioning rod 9. The rotating plate 8 drives the arc-shaped clamping block, the flange, the oil inlet pipe 2, and the positioning rod 9 to rotate together. In the process of rotation, the bottom grinding block 13 rubs and polishes the oil tank plate 3, the oil inlet pipe 2 rubs and polishes the oil tank plate 3, the positioning rod 9 sweeps the oil inlet pipe 2, and the limiting grinding block 16 polishes the end of the oil inlet pipe 2 and the flange. Adjust the first vertical telescopic rod 10 and the third vertical telescopic rod 26 together upward so that the bottom grinding block 13 and the bottom of the oil inlet pipe 2 are away from the oil tank plate 3.

[0059] (3) Chip suction: Turn on the chip suction device 19 to adsorb the polished iron filings.

[0060] (4) welding: down together adjust the first vertical telescopic rod 10 and the third vertical telescopic rod 26, the positioning rod 9 is inserted into the oil inlet hole of the oil tank plate 3, the oil inlet pipe 2 is abutted on the oil inlet hole of the oil tank plate 3; the fourth vertical telescopic rod 28 is adjusted upwards so that the bottom grinding block 13 bottom is away from the oil tank plate 3, the positioning rod 9 is adjusted upwards so that the limiting grinding block 16 is away from the end of the oil inlet pipe 2, the half circular ring gear 12 and the positioning rod 9 are rotated, the half circular ring gear 12 is rotated to drive the first welding gun 4 to rotate, the positioning rod 9 is rotated to drive the second welding gun 18 and the sealing rubber pipe 15 to rotate, at the same time, the first welding gun 4, the second welding gun 18 and the sealing rubber pipe 15 are opened, the first welding gun 4 is welded on the outside of the oil inlet pipe 2 to the oil inlet pipe 2 and the oil tank plate 3, the second welding gun 18 is welded on the upper end of the oil inlet pipe 2 to the oil inlet pipe 2 and the flange, the sealing glue extruded by the sealing rubber pipe 15 is bonded and sealed in the joint of the oil inlet pipe 2 and the oil tank plate 3 inside the oil inlet pipe 2, in the process of welding by the first welding gun 4, the welding heat is conducted to the sealing rubber pipe 15 inside the oil inlet pipe 2, so that the sealing glue melts and penetrates into the gap between the oil inlet pipe 2 and the oil tank plate 3 for bonding and sealing; in the process of welding by the second welding gun 18, the welding heat is conducted to the annular groove through the heat conduction hole 20, and the joint of the oil inlet pipe 2 and the oil tank bottom plate is preheated; and the welding heat at the first welding gun 4 is conducted to the position of the second welding gun 18 through the heat conduction hole 20, and the welding joint of the oil inlet pipe 2 and the flange is preheated to prevent cold cracks;

[0061] (5) weld polishing: down adjust the bottom grinding block 13 and the positioning rod 9, at the same time, rotate the half circular ring gear 12 and the positioning rod 9, the bottom grinding block 13 is rotated and the weld on the outside bottom of the oil inlet pipe 2 is polished, the limiting grinding block 16 is rotated and the inner weld at the oil inlet pipe 2 and the flange is polished;

[0062] (6) unloading: the first vertical telescopic rod 10 is retracted upwards, driving the welded flange, oil inlet pipe 2 and oil tank bottom plate to move upwards, the positioning rod 9 moves upwards, so that the positioning rod 9 is extracted from the oil inlet pipe 2, then the horizontal telescopic rod 27 is adjusted to loosen the flange, and the oil tank bottom plate is taken away for unloading.

[0063] The welding method for welding by using a transformer oil tank welding device can complete the processes of positioning and clamping of the flange, the oil inlet pipe 2 and the oil tank plate 3, polishing of the welding position, welding, polishing of the welding seam and unloading, and through positioning and clamping once, the polishing, chip suction, welding and polishing of the welding seam of multiple welding positions can be completed synchronously, thereby simplifying the overall welding steps and improving the welding efficiency. In addition, during the polishing of the welding position, the welding position can be preheated synchronously, the working characteristic of heat generation by polishing friction is utilized to reduce the subsequent welding seam cracks. During the welding of the outer side of the bottom of the oil inlet pipe 2, the inner side of the bottom of the oil inlet pipe 2 is simultaneously coated with sealant, and during the coating of the sealant, the heat of the outer side of the oil inlet pipe 2 and the welding heat of the welding position at the top of the oil inlet pipe 2 can be fully utilized to enable the sealant to melt and penetrate into the gap between the oil inlet pipe 2 and the oil tank plate 3, thereby improving the sealing and bonding effect. In addition, during the welding of the upper end and the lower end of the oil inlet pipe 2, the welding heat can be conducted and influenced with each other, thereby preheating the welding positions and slowly cooling the welding seam after welding, reducing the welding cracks and improving the welding quality.

[0064] In addition, further, between the step (5) and the step (6), the following step is further included: detecting the welding strength: the second motor 24 is opened, the second motor 24 gives a rotating force to the rotating plate 8, if the flange falls off from the oil inlet pipe 2, it indicates that the welding strength of the flange and the oil inlet pipe 2 is insufficient, otherwise it indicates that the welding strength between the flange and the oil inlet pipe 2 meets the initial detection, if the oil inlet pipe 2 falls off from the oil tank plate 3, it indicates that the welding strength of the oil inlet pipe 2 and the oil tank plate 3 is insufficient, otherwise it indicates that the welding strength of the oil inlet pipe 2 and the oil tank plate 3 meets the initial detection.

[0065] By setting the step of detecting the welding strength between the step (5) and the step (6), the welding strength can be detected by the welding device without the need for a special detection mechanism.

[0066] By further detecting the welding strength between the step (5) and the step (6), after welding, the welding piece does not need to be positioned again, and the welding strength detection device is not needed to be used again, the welding strength of the welding piece can be detected by using the existing welding structure, the structure is simple, practical and convenient, and the welding strength detection step is simplified.

[0067] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. It should be understood that the specific embodiments described herein are only for understanding the application and are not intended to limit the application, and all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the application.

Claims

1. A transformer tank welding device for welding flanges, oil inlet pipes, and tank plates, comprising a first welding torch and a worktable, characterized in that: A top plate is connected to the workbench via a support rod. A rotating plate is rotatably connected below the top plate. A lifting and rotating positioning rod is connected to the center of the rotating plate. The diameter of the positioning rod is smaller than the inner diameter of the oil inlet pipe. A cleaning brush strip for cleaning the oil inlet pipe is installed on one side of the positioning rod. Two first vertical telescopic rods are symmetrically arranged on the left and right sides below the rotating plate. The inner sides of each of the two first vertical telescopic rods are connected to arc-shaped clamping blocks via horizontal telescopic rods. A semi-circular ring gear is rotatably connected below each arc-shaped clamping block. Two semi-circular ring gears can be joined to form a circular ring gear. One of the semi-circular ring gears is connected to a drive mechanism that drives its rotation. A first welding torch is located below the semi-circular ring gear. Each arc-shaped clamping block... Below each part is connected to a bottom grinding block via a fourth vertical telescopic rod. The bottom grinding block has an arc-shaped cross-section. When the arc clamping block clamps the flange, the bottom grinding block clamps the oil inlet pipe. The positioning rod has an annular groove at the height corresponding to the weld seam of the oil inlet pipe and the oil tank plate. A sealing tube is installed in the annular groove. The positioning rod has a "7"-shaped limiting grinding block, which is used to limit the oil inlet pipe and the flange. The positioning rod has a groove, in which a second welding gun is installed. The second welding gun is used to weld the oil inlet pipe and the flange. The second welding gun is aligned with the top of the oil inlet pipe and the inner mating position of the flange. A chip collector is installed below the semi-circular ring gear. A heat conduction hole is provided on the positioning rod at the position of the second welding gun. The other end of the heat conduction hole is connected to the annular groove.

2. The transformer tank welding device according to claim 1, characterized in that: The annular groove contains a solder paste gun, a soldering iron, and a grinding head arranged sequentially on one side of the sealing tube.

3. The transformer tank welding device according to claim 2, characterized in that: The solder paste gun includes a push tube, inside which is installed a push piston, which is detachably connected to an electric push rod that drives it to push and pull.

4. The transformer tank welding device according to claim 1, characterized in that: A heat-conducting rod is installed inside the heat-conducting hole.

5. The transformer tank welding device according to claim 1, characterized in that: The workbench is equipped with a positioning groove that can be used to snap the fuel tank plate.

6. The transformer tank welding device according to claim 1, characterized in that: The drive mechanism includes a first motor, the output shaft of which is connected to a pinion. The first motor is fixed on one of the first vertical telescopic rods, and the pinion meshes with a semi-circular ring gear.

7. The transformer tank welding device according to claim 1, characterized in that: A second motor is provided above the top plate, and the output shaft of the second motor passes through the top plate and is connected to the rotating plate.

8. The transformer tank welding device according to claim 1, characterized in that: A third motor is located below the rotating plate, and a third vertical telescopic rod is located at the bottom of the output shaft of the third motor. The third vertical telescopic rod is connected to the positioning rod.

9. A welding method using a transformer tank welding apparatus as described in claim 1, characterized in that: Includes the following steps: (1) Preparation: Place the oil tank plate on the workbench, put the oil inlet pipe on the positioning rod, put the flange on the outside of the oil inlet pipe, and the top of the oil inlet pipe and the flange are both against the limiting grinding block; adjust the first vertical telescopic rod and the horizontal telescopic rod so that the arc clamping block clamps the flange and the bottom grinding block abuts the oil inlet pipe; adjust the fourth vertical telescopic rod so that the bottom grinding block is flush with the bottom of the oil inlet pipe; adjust the first vertical telescopic rod and the third vertical telescopic rod together so that the bottom grinding block and the bottom of the oil inlet pipe abut against the oil tank plate. At this time, the positioning rod is inserted into the oil inlet hole on the oil tank plate. (2) Grinding: Rotate the rotating plate and simultaneously rotate the positioning rod in the opposite direction. The rotating plate drives the arc-shaped clamping block, flange, oil inlet pipe and positioning rod to rotate together. During the rotation, the bottom grinding block rubs and grinds the oil tank plate, the oil inlet pipe rubs and grinds with the oil tank plate, the positioning rod cleans the oil inlet pipe, and at the same time the limiting grinding block grinds the ends of the oil inlet pipe and flange. Adjust the first vertical telescopic rod and the third vertical telescopic rod upward together so that the bottom grinding block and the bottom of the oil inlet pipe leave the oil tank plate. (3) Dust collection: Turn on the dust collector to collect the iron filings from the grinding process; (4) Welding: Adjust the first and third vertical telescopic rods downwards together, insert the positioning rod into the oil inlet hole of the oil tank plate, and place the oil inlet pipe against the oil inlet hole of the oil tank plate; adjust the fourth vertical telescopic rod upwards so that the bottom grinding block leaves the oil tank plate, adjust the positioning rod upwards so that the limiting grinding block leaves the end of the oil inlet pipe, rotate the semi-circular ring gear and the positioning rod, the semi-circular ring gear rotates to drive the first welding gun to rotate, the positioning rod rotates to drive the second welding gun and the sealing hose to rotate, and at the same time open the first welding gun, the second welding gun and the sealing hose. The first welding gun welds the oil inlet pipe and the oil tank plate outside the oil inlet pipe, and the second welding gun welds the oil inlet pipe and the oil tank plate at the upper end of the oil inlet pipe. The oil inlet pipe and flange are welded together. The sealant extruded from the sealing tube bonds and seals the joint between the oil inlet pipe and the tank plate inside the oil inlet pipe. During the welding process of the first welding gun, the welding heat is conducted to the sealing tube inside the oil inlet pipe, causing the sealant to melt and seep into the gap between the oil inlet pipe and the tank plate for bonding and sealing. During the welding process of the second welding gun, the welding heat is conducted to the annular groove through the heat conduction hole to preheat the joint between the oil inlet pipe and the bottom plate of the tank. Meanwhile, the welding heat from the first welding gun is conducted to the position of the second welding gun through the heat conduction hole to preheat the weld joint between the oil inlet pipe and the flange, preventing cold cracks. (5) Weld grinding: Adjust the bottom grinding block and positioning rod downwards, and at the same time rotate the semi-circular ring gear and positioning rod. The bottom grinding block rotates and grinds the weld at the bottom of the outside of the oil inlet pipe. The limiting grinding block rotates and grinds the inner weld at the oil inlet pipe and flange. (6) Unloading: The first vertical telescopic rod retracts upward, causing the welded flange, oil inlet pipe and oil tank bottom plate to move upward. The positioning rod moves upward, so that the positioning rod is pulled out from the oil inlet pipe. Then, the horizontal telescopic rod is adjusted to loosen the flange and remove the oil tank bottom plate for unloading.

10. The welding method using a transformer tank welding device according to claim 9, characterized in that: Between steps (5) and (6), the following steps are also included: testing the welding strength: turn on the second motor, the second motor gives the rotating plate a rotational force. If the flange falls off the oil inlet pipe, it means that the welding strength between the flange and the oil inlet pipe is insufficient. Otherwise, it means that the welding strength between the flange and the oil inlet pipe meets the initial inspection. If the oil inlet pipe falls off the oil tank plate, it means that the welding strength between the oil inlet pipe and the oil tank plate is insufficient. Otherwise, it means that the welding strength between the oil inlet pipe and the oil tank plate meets the initial inspection.

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