Transformer oil tank welding device and welding method

Abstract

The transformer oil tank welding device comprises a workbench and a top plate, a rotating plate is rotationally connected to the lower portion of the top plate, a positioning rod is connected to the middle of the lower portion of the rotating plate, two first vertical telescopic rods are symmetrically arranged on the left side and the right side of the lower portion of the rotating plate, and arc clamping blocks are connected to the inner sides of the first vertical telescopic rods through horizontal telescopic rods; a semi-circular ring gear is rotationally connected below the arc clamping block, a first welding gun is arranged below the semi-circular ring gear, a bottom grinding block is connected below the arc clamping block, and a sealing rubber pipe, a limiting grinding block, a second welding gun and a heat conduction hole are arranged on the positioning rod; through the arrangement, synchronous positioning welding of the oil inlet pipe, the oil tank plate and the flange can be completed at the same time, synchronous sealing of the oil inlet pipe and the interior of the oil tank plate is completed while welding is conducted, operation steps are reduced, the utilization functionality of each structure is improved, the structure is compact, heat conduction holes are utilized, welding at the two positions is associated, mutual preheating is conducted, and slow cooling is conducted; therefore, welding cold cracks are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil tank welding, and in particular relates to a transformer oil tank welding device and a welding method. Background Art

[0002] An oil inlet is provided on the transformer oil tank, and an oil inlet pipe is provided on the oil inlet of the transformer. The oil inlet pipe needs to be welded to the oil inlet. When welding the oil inlet pipe, generally, a flange is first welded at the end of the oil inlet pipe, and then the other end of the oil inlet pipe is welded to the transformer oil tank. After welding, the weld seam needs to be polished manually. Moreover, when welding the oil inlet pipe and the flange, the oil inlet pipe and the flange need to be respectively positioned and fixed, and the fixing is removed after welding. Then the oil inlet pipe is flipped, and the oil inlet pipe is positioned and clamped before welding. The operation steps are relatively complex, wasting manpower and material resources, and the overall efficiency is relatively low. Summary of the Invention

[0003] In view of the deficiencies and defects existing in the prior art, the purpose of the present invention is to provide a transformer oil tank welding device and a welding method, which solve the problems that the existing transformer oil tank welding device needs to respectively position and fix the oil inlet pipe and the flange, remove the fixing after welding, then flip the oil inlet pipe, and then position and clamp the oil inlet pipe. The operation steps are relatively complex, wasting manpower and material resources, and the overall efficiency is relatively low.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: A transformer oil tank welding device for welding flanges, inlet pipes and oil tank plates, comprising a first welding torch and a workbench. Above the workbench, a top plate is connected through a support rod. A rotating plate is rotatably connected below the top plate. In the middle below the rotating plate, a positioning rod that can be lifted and rotated is connected. The diameter of the positioning rod is smaller than the inner diameter of the inlet pipe. On one side of the positioning rod, there is a cleaning brush strip capable of cleaning the inlet pipe. On the left and right sides below the rotating plate, two first vertical telescopic rods are symmetrically arranged. Inside each of the two first vertical telescopic rods, an arc-shaped clamping block is connected through a horizontal telescopic rod. Below each arc-shaped clamping block, a semi-circular ring gear is rotatably connected. The two semi-circular ring gears can be assembled into a circular ring gear. One of the semi-circular ring gears is connected to a driving mechanism for driving its rotation. The first welding torch is arranged below the semi-circular ring gear. Below each arc-shaped clamping block, a bottom grinding block is connected through a fourth vertical telescopic rod. The cross-sectional shape of the bottom grinding block is arc-shaped. When the arc-shaped clamping block clamps the flange, the bottom grinding block clamps the inlet pipe. The positioning rod is provided with a ring groove at the height corresponding to the weld of the inlet pipe and the oil tank plate. A sealant hose is arranged in the ring groove. On the positioning rod, there is a "7"-shaped limiting grinding block for limiting the inlet pipe and the flange. There is a groove on the positioning rod, and a second welding torch is arranged in the groove. The second welding torch is used for welding the inlet pipe and the flange. The second welding torch is aligned with the docking position at the top end of the inlet pipe and the inner side of the flange. Below the semi-circular ring gear, there is a chip absorber; on the positioning rod at the position of the second welding torch, there is a heat conduction hole, and the other end of the heat conduction hole communicates with the annular groove.

[0005] As a further improvement of the present invention, a solder paste gun, an electric soldering iron and a grinding head are sequentially arranged on one side of the sealant hose in the ring groove.

[0006] As a further improvement of the present invention, the solder paste gun includes a push tube. A push piston is arranged in the push tube, and the push piston is detachably connected to an electric push rod for driving its push and pull.

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

[0008] As a further improvement of the present invention, a positioning groove capable of clamping the oil tank plate is arranged on the workbench.

[0009] As a further improvement of the present invention, the driving mechanism includes a first motor. The output shaft of the first motor is connected to a small gear. The first motor is fixed on one of the first vertical telescopic rods, and the small gear meshes with the semi-circular ring gear.

[0010] As a further improvement of the present invention, a second motor is arranged above the top plate. The output shaft of the second motor passes through the top plate and is connected to the rotating plate.

[0011] As a further improvement of the present invention, a third motor is provided below the rotating plate, and a third vertical telescopic rod is provided at the bottom of the output shaft of the third motor. The third vertical telescopic rod is connected to the positioning rod.

[0012] A welding method using a transformer oil tank welding device for welding: includes the following steps: (1) Preparation: Place the oil tank plate on the workbench, sleeved the oil inlet pipe on the positioning rod, and sleeved the flange on the outside of the oil inlet pipe. Both the top of the oil inlet pipe and the flange are abutted 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 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 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 at the same time rotate the positioning rod in the reverse direction. The rotating plate drives the arc clamping block, the flange, the oil inlet pipe and the positioning rod to rotate together. During the rotation, the bottom grinding block grinds the oil tank plate by friction, the oil inlet pipe and the oil tank plate are ground by friction, 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 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 leave the oil tank plate; (3) Chip suction: Turn on the chip suction device to adsorb the iron chips ground; (4) Welding: Jointly adjust the first vertical telescopic rod and the third vertical telescopic rod downward, insert the positioning rod into the oil inlet hole on the oil tank plate, and the oil inlet pipe abuts against the oil inlet hole on the oil tank plate; adjust the fourth vertical telescopic rod upward so that the bottom of the bottom grinding block leaves the oil tank plate, adjust the positioning rod upward 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 rotation of the semi-circular ring gear drives the first welding torch to rotate, the rotation of the positioning rod drives the second welding torch and the sealant pipe to rotate, and at the same time turn on the first welding torch, the second welding torch, and the sealant pipe. The first welding torch welds the oil inlet pipe and the oil tank plate outside the oil inlet pipe. The second welding torch welds the oil inlet pipe and the flange at the upper end of the oil inlet pipe. The sealant extruded by the sealant pipe bonds and seals the butt joint of the oil inlet pipe and the oil tank plate inside the oil inlet pipe. During the welding process of the first welding torch, the welding heat is conducted to the sealant pipe inside the oil inlet pipe, so that the sealant melts and seeps into the gap between the oil inlet pipe and the oil tank plate for bonding and sealing; during the welding process of the second welding torch, the welding heat is conducted to the annular groove through the heat conduction hole to preheat the butt joint of the oil inlet pipe and the oil tank bottom plate; and the welding heat at the first welding torch is conducted to the position of the second welding torch through the heat conduction hole to preheat the welding joint of the oil inlet pipe and the flange to prevent cold cracks from occurring; (5)Weld grinding: Adjust the bottom grinding block and the positioning rod downward, and at the same time rotate the semi-circular gear and the positioning rod. The bottom grinding block rotates and grinds the weld at the outer bottom of the fuel inlet pipe, and the limiting grinding block rotates and grinds the inner weld at the joint of the fuel inlet pipe and the flange. (6)Unloading: The first vertical telescopic rod retracts upward, driving the welded flange, fuel inlet pipe and fuel tank bottom plate to move upward. The positioning rod moves upward, so that the positioning rod is withdrawn from the fuel inlet pipe. Then, adjust the horizontal telescopic rod to loosen the flange, and take away the fuel tank bottom plate for unloading.

[0013] As a further improvement of the present invention, between step (5) and step (6), the following steps are further included: Detect the welding strength: Turn on the second motor, and the second motor gives a rotational force to the rotating plate. If the flange falls off the fuel inlet pipe, it means that the welding strength between the flange and the fuel inlet pipe is insufficient. On the contrary, it means that the welding strength between the flange and the fuel inlet pipe meets the initial inspection. If the fuel inlet pipe falls off the fuel tank plate, it means that the welding strength between the fuel inlet pipe and the fuel tank plate is insufficient. Otherwise, it means that the welding strength between the fuel inlet pipe and the fuel tank plate meets the initial inspection.

[0014] Compared with the prior art, the present invention has the following advantages: 1. By setting a rotating plate, a first vertical telescopic rod, a second vertical telescopic rod, a positioning rod, a bottom module, an arc-shaped clamping block, a semi-circular gear, a limiting grinding block, a first welding torch, a second welding torch, a blood sucker and a sealing rubber tube, and a heat conduction hole is arranged in the positioning rod. Therefore, during welding, place the fuel tank plate on the workbench, sleeved the fuel inlet pipe on the positioning rod, then sleeve the flange on the outer side of the top of the fuel inlet pipe, and use the limiting grinding block on the positioning rod for limit positioning. Then press the bottom of the fuel inlet pipe on the fuel inlet hole to complete the positioning, clamping and fixing of the fuel tank plate, the fuel inlet pipe and the flange. Then rotate the rotating plate and rotate the positioning rod in the opposite direction. 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 fuel tank plate rub and grind against each other to grind off rust and burrs, making the contact surface between the end of the oil inlet pipe and the fuel tank plate smoother and more fitted. When the oil inlet pipe and the fuel tank plate are butt-welded, the contact gap is reduced to improve the sealing performance. In addition, this operation can complete the grinding of the two butt surfaces at the same time, and the oil inlet pipe and the fuel tank plate are smooth and compatible with each other. In addition, when the bottom grinding block rotates, the bottom grinding block grinds the flat surface on the fuel tank plate on the outside of the oil inlet pipe to grind off rusty and dirty surfaces, improve the cleanliness of the weld, thereby improving the strength of the subsequent weld and avoiding the problem of strong welding. In addition, at the same time, when the flange and the oil inlet pipe rotate, the limit module on the positioning rod can The end and the inner side of the flange are polished to improve the cleanliness of the weld and the subsequent welding strength. The limit module plays the dual role of limit positioning and polishing the weld. One structure can be used in multiple scenarios and has strong functionality. In addition, the polishing coordination between the oil inlet pipe and the fuel tank plate, the polishing of the outer side of the oil inlet pipe on the fuel tank plate, and the polishing of the joint between the flange and the inner side of the oil inlet pipe can be completed simultaneously, and the overall operation efficiency is high. In addition, by polishing the welded joints of the oil inlet pipe, the fuel tank plate, and the flange, the joints of the oil inlet pipe, the fuel tank plate, and the flange become hot during polishing, thereby completing the preheating of the weld and preventing welding cracks. This method of using polishing for welding preheating, firstly, does not require a specific heating mechanism, and the structure is simpler. Secondly, the preheating and polishing steps can be superimposed, the operation steps are simplified, and the overall operation efficiency is high.

[0015] After grinding, use the chip suction device to absorb the iron chips to keep the welding area clean.

[0016] After the iron filings are sucked out, the first welding gun welds the oil inlet pipe and the fuel tank plate together at the outside of the bottom of the oil inlet pipe. At the same time, the second welding gun welds the oil inlet pipe and the flange together at the upper end of the oil inlet pipe and the inner side of the flange. At the same time, the sealing hose bonds and seals the joint between the inner side of the oil inlet pipe and the inner side of the fuel tank plate. During the gluing process of the sealing hose, the welding heat of the first welding gun on the outside can make the sealant more molten, which is convenient for the sealant to penetrate into the gap between the oil inlet pipe and the fuel tank plate, resulting in better sealing effect and preventing oil leakage. The bonding and sealing of the sealant fully utilize the welding heat during welding. Welding and gluing are interrelated and complement each other, which is simple and convenient.

[0017] In addition, during the welding process, the welding at the bottom end of the oil inlet pipe and the welding at the upper end of the oil inlet pipe can exchange heat through the heat conduction holes. Firstly, the welding point can be preheated during the welding process, and secondly, the weld can be slowly cooled to reduce welding cracks, so that the two welds can interact with each other to improve the welding quality.

[0018] After welding is completed, adjust the bottom grinding block and the limit grinding block to grind the weld seam to improve the smoothness of the weld seam. The bottom grinding block and the limit grinding block grind the welding area before welding. After welding is completed, they grind the weld seam for grinding work in different processes, with strong functionality. The fuel inlet pipe, flange, and fuel tank plate only need to be positioned and clamped once, and the overall efficiency is relatively high.

[0019] After welding and weld seam grinding are completed, the torsional strength of the welding can be detected by rotating the rotating plate, thus completing the preliminary detection of the welding.

[0020] 2. By sequentially arranging a solder paste gun, an electric soldering iron, and a grinding head on one side of the sealant hose in the annular groove, after the fuel inlet pipe and the fuel tank plate are welded using solder paste and an electric soldering iron inside the fuel inlet pipe, glue can be applied for sealing, and the connection strength and sealing effect are relatively good.

[0021] 3. By arranging a heat conduction rod in the heat conduction hole, better heat conduction during welding can be achieved.

[0022] 4. By arranging a positioning groove on the workbench, the fuel tank plate can be positioned and clamped.

[0023] 5. By setting the driving mechanism as a structure of a first motor, a small gear, and a first vertical telescopic rod, the first motor can drive the small gear to rotate. During the rotation of the small gear, the semi-circular ring gear is driven to rotate. When the semi-circular ring gear rotates, it pushes the rotation of another semi-circular ring gear, thereby driving the bottom grinding block and the first welding gun to rotate.

[0024] 6. A welding method using a transformer fuel tank welding device can complete the processes of positioning and clamping of the flange, fuel inlet pipe, and fuel tank plate, grinding of the welding area, welding, grinding of the weld seam, and unloading. Through one-time positioning and clamping, the grinding, chip suction, welding, and grinding of the weld seam processes of multiple welding positions can be completed synchronously, simplifying the overall welding steps and improving the welding efficiency. In addition, during the grinding of the welding area, the welding area can be preheated simultaneously, taking advantage of the working characteristic of heat generation by grinding friction to reduce subsequent weld cracks. During the welding of the outer bottom of the fuel inlet pipe, sealant is applied to the inner bottom of the fuel inlet pipe at the same time. During the application of the sealant, the heat on the outer side of the fuel inlet pipe and the welding heat at the top welding area of the fuel inlet pipe can be fully utilized, enabling the sealant to melt and penetrate into the gap between the fuel inlet pipe and the fuel tank plate, improving the sealant bonding effect and preventing oil from seeping into the gap between the fuel inlet pipe and the fuel tank plate, causing corrosion and leakage. In addition, during the welding of the upper and lower ends of the fuel inlet pipe, the welding heat can be conducted and influenced mutually, thereby preheating the welding position, slow cooling the weld seam after welding, reducing welding cracks, improving the welding quality, and making multiple welding positions related to each other.

[0025] 7. By setting a step of increasing the detection of the welding strength between step (5) and step (6), after welding, there is no need to reposition the welded parts, nor is it necessary to specifically set up a dedicated detection mechanism. Using the existing welding structure, the welding strength of the welded parts can be detected. The structure is simple, practical and convenient, and the detection steps of the welding strength are simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings: Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 a cross-sectional view of; Figure 3 is Figure 2 an enlarged view at A; Figure 4 is a schematic structural diagram of the positioning rod at the annular groove; Figure 5 is a schematic structural diagram of the solder paste gun; In the figure: 1, welding flange; 2, oil inlet pipe; 3, fuel tank plate; 4, first welding gun; 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, annular groove; 15, sealing rubber tube; 16, limit grinding block; 17, groove; 18, second welding gun; 19, chip suction device; 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, installation slot hole; 34, electric push rod; 35, push tube; 36, push piston; 37, cleaning brush strip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will Figures 1-4 further describe the present invention in detail. For a clearer illustration, only the structures related to the inventive points of the present invention are shown in the figure.

[0028] For the convenience of description, a coordinate system is now defined as Figure 1 shown, and the left-right direction is defined as the horizontal direction, the front-back direction is defined as the longitudinal direction, and the up-down direction is defined as the vertical direction.

[0029] An embodiment of the present invention discloses a transformer fuel tank welding device. Referring to Figure 1 and 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 torch 4 and a workbench 5. A positioning groove 21 capable of clamping the oil tank plate 3 is provided on the workbench 5, so that the oil tank plate 3 can be positioned and clamped. Above the workbench 5, a top plate 7 is connected through a support rod 6. A rotating plate 8 is rotatably connected below the top plate 7. A second motor 24 is provided above the top plate 7. The output shaft of the second motor 24 passes through the top plate 7 and is connected to the rotating plate 8, and the motor drives the rotating plate 8 to rotate.

[0030] In the middle below the rotating plate 8, a positionable rod 9 that can be lifted and rotated is connected. Specifically, a third motor 25 is provided below the rotating plate 8. At the bottom of the output shaft of the third motor 25, a third vertical telescopic rod 26 is provided. The third vertical telescopic rod 26 is connected to the positionable rod 9. The diameter of the positionable rod 9 is smaller than the inner diameter of the oil inlet pipe 2. On one side of the positionable rod 9, a cleaning brush strip 37 capable of cleaning the oil inlet pipe 2 is provided. On the left and right sides below the rotating plate 8, two first vertical telescopic rods 10 are symmetrically arranged. Inside each of the two first vertical telescopic rods 10, an arc-shaped clamping block 11 is connected through a horizontal telescopic rod 27. Below each arc-shaped clamping block 11, a semi-circular ring gear 12 is rotatably connected. For example, a chute is provided below the arc-shaped clamping block 11, and a slider that is slidably matched with the chute is provided on the semi-circular ring gear 12, so that the semi-circular ring gear 12 can rotate around the arc-shaped clamping block 11. The two semi-circular ring gears 12 can be assembled into a circular ring gear. In addition, one of the semi-circular ring gears 12 is connected to a driving mechanism for driving its rotation. Specifically, the driving mechanism includes a first motor 22. The output shaft of the first motor 22 is connected to a small gear 23. The first motor 22 is fixed on one of the first vertical telescopic rods 10. The small gear 23 meshes with the semi-circular ring gear 12. By setting the driving mechanism as the structure of the first motor 22, the small gear 23 and the first vertical telescopic rod 10, the first motor 22 can drive the small gear 23 to rotate. During the rotation of the small gear 23, the semi-circular ring gear 12 is driven to rotate. When the semi-circular ring gear 12 rotates, the other semi-circular ring gear 12 is pushed to rotate, thereby driving the bottom grinding block 13 and the first welding torch 4 to rotate.

[0031] The first welding torch 4 is arranged below the semi-circular ring gear. Below each arc-shaped clamping block 11, a bottom grinding block 13 is connected through a fourth vertical telescopic rod 28. The cross-sectional shape of the bottom grinding block 13 is arc-shaped. When the arc-shaped clamping block 11 clamps the flange, the bottom grinding block 13 clamps the oil inlet pipe 2, as Figure 2 and Figure 4 shown. At the position height corresponding to the weld of the oil inlet pipe 2 and the oil tank plate 3, the positionable rod 9 is provided with an annular groove 14. Inside the annular groove 14, a sealant pipe 15 is provided, as Figure 3As shown in the figure, a "7"-shaped limiting grinding block 16 is provided on the positioning rod 9. The height difference between the bottom plane of the vertical part and the bottom plane of the horizontal part of the limiting module 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. The limiting grinding block 16 is used to limit the oil inlet pipe 2 and the flange.

[0032] As Figure 3 shown in the figure, a groove 17 is provided on the positioning rod 9. A second welding torch 18 is provided in the groove 17. The second welding torch 18 is used to weld the oil inlet pipe 2 and the flange. The second welding torch 18 is aligned with the inner docking position at the top end of the oil inlet pipe 2 and the flange. A chip absorber 19 is provided below the semi-circular ring gear 12; a heat conduction hole 20 is provided on the positioning rod 9 at the position of the second welding torch 18. The other end of the heat conduction hole 20 is communicated with the annular groove. A heat conduction rod or heat conduction material is provided in the heat conduction hole 20; by providing a heat conduction rod in the heat conduction hole 20, better welding heat conduction can be achieved.

[0033] In addition, as Figure 4 and Figure 5 shown in the figure, a solder paste gun 29, an electric soldering iron 30 and a grinding head 31 are successively provided on one side of the sealing rubber tube 15 in the annular groove 14. The solder paste gun 29 can apply solder paste. The solder paste gun 29 can adopt a syringe push-pull type. The structure specifically includes a push tube 35. A push piston 36 is arranged in the push tube 35. The push piston 36 is detachably connected to an electric push rod 34 that drives its push and pull in a threaded manner. The movement of the electric push rod 34 can be controlled by a PLC. The electric push rod 34 can drive the push piston 36 to move, thereby extruding the solder paste. In addition, an installation slot hole 33 that avoids the solder paste gun 29 is provided on the positioning rod 9 at the position where the solder paste gun 29 is provided. The push tube 35 can be fixed in the annular groove 14 by a clamp or a clip. In addition, the sealing rubber tube 15 can adopt a common and commonly used rubber tube, or can adopt the same structure as the solder paste gun 29.

[0034] By successively providing a solder paste gun 29, an electric soldering iron 30 and a grinding head 31 on one side of the sealing rubber tube 15 in the annular groove 14, after first using the solder paste and the electric soldering iron 30 to weld the oil inlet pipe 2 and the fuel tank plate 3 on the inner side of the oil inlet pipe 2, then applying glue for sealing, the connection strength and the sealing effect are better.

[0035] In the present invention, by providing a rotating plate 8, a first vertical telescopic rod 10, a second vertical telescopic rod, a positioning rod 9, a bottom module, an arc-shaped clamping block, a semi-circular ring gear 12, a limiting grinding block 16, a first welding torch 4, a second welding torch 18, a blood sucking device and a sealing rubber tube 15, and a heat conduction hole 20 is provided in the positioning rod 9. Therefore, during welding, the fuel tank plate 3 is placed on the workbench 5, the oil inlet pipe 2 is sleeved on the positioning rod 9, then the flange is sleeved on the outer side of the top of the oil inlet pipe 2, and the limiting grinding block 16 on the positioning rod 9 is used for limiting and positioning. Then, the bottom of the oil inlet pipe 2 is pressed on the oil inlet hole to complete the positioning, clamping and fixing of the fuel tank plate 3, the oil inlet pipe 2 and the flange.

[0036] Then rotate the rotating plate 8 and rotate the positioning rod 9 in the reverse direction. The rotating plate 8 can drive the flange and the oil inlet pipe 2 to rotate. When the oil inlet pipe 2 rotates, there is mutual friction and grinding between the bottom of the oil inlet pipe 2 and the fuel tank plate 3, grinding off rust and burrs, making the contact surface between the end of the oil inlet pipe 2 and the fuel tank plate 3 smoother, more fitting and more closely attached. When the oil inlet pipe 2 and the fuel tank plate 3 are butt-welded, the contact gap is reduced, and the sealing performance is improved. Moreover, in this step of operation, the grinding of two butting surfaces can be completed simultaneously, and the oil inlet pipe 2 and the fuel tank plate 3 are ground smooth with better cooperation, reducing the butting gap. In addition, when the bottom grinding block 13 rotates, the bottom grinding block 13 grinds the upper plane of the fuel tank plate 3 on the outside of the oil inlet pipe 2, grinding off the rusty and dirty surface, improving the cleanliness of the weld, thereby improving the subsequent weld strength and avoiding the problem of poor welding firmness. In addition, 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 upper end of the oil inlet pipe 2 and the inner side of the flange, improving the cleanliness of the welding area and the subsequent welding strength. The limiting module plays the roles of limiting, positioning and grinding the welding area at the same time. One structure has multiple functions in different scenarios, with strong functionality. In addition, the grinding and cooperation between the oil inlet pipe 2 and the fuel tank plate 3, the grinding of the outside of the oil inlet pipe 2 on the fuel tank plate 3, and the grinding of the inner butt joint of the flange and the oil inlet pipe 2 can be completed synchronously, with relatively high overall operation efficiency. In addition, by grinding the butt-welding areas of the oil inlet pipe 2, the fuel tank plate 3 and the flange, the butt joints of the oil inlet pipe 2, the fuel tank plate 3 and the flange become hot during grinding, thus completing the preheating of the welding area and preventing welding cracks. This method of using grinding for welding preheating, firstly, does not require a specific heating mechanism, making the structure simpler; secondly, the steps of preheating and grinding can be superimposed, with relatively high overall operation efficiency.

[0037] After the grinding is completed, the iron filings ground off are adsorbed by the chip suction device 19 to keep the welding area clean.

[0038] After the iron filings are sucked up, the first welding torch 4 welds the oil inlet pipe 2 to the fuel tank plate 3 on the outside of the bottom of the oil inlet pipe 2. At the same time, the second welding torch 18 welds the oil inlet pipe 2 to the flange on the upper end of the oil inlet pipe 2 and the inner side of the flange. At the same time, the sealing rubber tube 15 bonds and seals the butt joint between the inner side of the oil inlet pipe 2 and the inner side of the fuel tank plate 3. During the process of applying the sealing glue by the sealing rubber tube 15, the welding heat of the first welding torch 4 on the outside can make the sealing glue more molten, facilitating the penetration of the sealing glue into the gap between the oil inlet pipe 2 and the fuel tank plate 3, with better sealing effect and preventing oil leakage, making full use of the welding heat during welding for the bonding and sealing of the sealing glue. Welding and glue application are interrelated and complementary, being simple and convenient.

[0039] In addition, during the welding process, the welding at the bottom end and the welding at the upper end of the inlet pipe 2 can exchange heat through the heat conduction holes 20. First, it can preheat the welding area during the welding process. Second, it can slowly cool the weld seam to reduce welding cracks, enabling the two weldings to interact and utilize each other, thereby improving the welding quality.

[0040] After welding is completed, adjust the bottom grinding block 13 and the limit grinding block 16 to grind the weld seam to improve the smoothness of the weld seam. The bottom grinding block 13 and the limit grinding block 16 grind the welding area before welding and grind the weld seam after welding, which is used for grinding work in different processes and has a strong function. The inlet pipe 2, the flange, and the fuel tank plate 3 only need to be positioned and clamped once, and the overall efficiency is relatively high.

[0041] After welding and weld seam grinding are completed, the torsional strength of the welding can be detected by rotating the rotating plate 8, thus completing the preliminary detection of the welding.

[0042] A welding method using a transformer fuel tank welding device for welding: includes the following steps: (1) Preparation: Place the fuel tank plate 3 on the workbench 5, put the inlet pipe 2 on the positioning rod 9, put the flange sleeve on the outside of the inlet pipe 2, and the tops of the inlet pipe 2 and the flange are both against the limit grinding block 16; adjust the first vertical telescopic rod 10 and the horizontal telescopic rod 27 so that the arc clamping block 11 clamps the flange, and the bottom grinding block 13 presses against the inlet pipe 2; adjust the fourth vertical telescopic rod 28 so that the bottom grinding block 13 is flush with the bottom of the inlet pipe 2; jointly adjust the first vertical telescopic rod 10 and the third vertical telescopic rod 26 so that the bottom grinding block 13 and the bottom of the inlet pipe 2 press against the fuel tank plate 3. At this time, the positioning rod 9 is inserted into the oil inlet hole on the fuel tank plate 3. (2) Grinding: Rotate the rotating plate 8, and at the same time rotate the positioning rod 9 in the opposite direction. The rotating plate 8 drives the arc clamping block, the flange, the inlet pipe 2, and the positioning rod 9 to rotate together. During the rotation process, the bottom grinding block 13 grinds the fuel tank plate 3 by friction, the inlet pipe 2 and the fuel tank plate 3 are ground by friction, the positioning rod 9 cleans the inlet pipe 2, and at the same time the limit grinding block 16 grinds the ends of the inlet pipe 2 and the flange; jointly adjust the first vertical telescopic rod 10 and the third vertical telescopic rod 26 upward so that the bottom grinding block 13 and the bottom of the inlet pipe 2 leave the fuel tank plate 3. (3) Chip suction: Turn on the chip suction device 19 to adsorb the iron chips generated during grinding. (4)Welding: Adjust the first vertical telescopic rod 10 and the third vertical telescopic rod 26 downward together. Insert the positioning rod 9 into the oil inlet hole of the fuel tank plate 3, and the fuel inlet pipe 2 abuts against the oil inlet hole of the fuel tank plate 3. Adjust the fourth vertical telescopic rod 28 upward so that the bottom of the bottom grinding block 13 leaves the fuel tank plate 3. Adjust the positioning rod 9 upward so that the limit grinding block 16 leaves the end of the fuel inlet pipe 2. Rotate the semi-circular ring gear 12 and the positioning rod 9. The rotation of the semi-circular ring gear 12 drives the rotation of the first welding torch 4, and the rotation of the positioning rod 9 drives the rotation of the second welding torch 18 and the sealant pipe 15. At the same time, turn on the first welding torch 4, the second welding torch 18, and the sealant pipe 15. The first welding torch 4 welds the fuel inlet pipe 2 and the fuel tank plate 3 outside the fuel inlet pipe 2. The second welding torch 18 welds the fuel inlet pipe 2 and the flange at the upper end of the fuel inlet pipe 2. The sealant extruded by the sealant pipe 15 bonds and seals the butt joint of the fuel inlet pipe 2 and the fuel tank plate 3 inside the fuel inlet pipe 2. During the welding process of the first welding torch 4, the welding heat is conducted to the sealant pipe 15 inside the fuel inlet pipe 2, causing the sealant to melt and penetrate into the gap between the fuel inlet pipe 2 and the fuel tank plate 3 for bonding and sealing. During the welding process of the second welding torch 18, the welding heat is conducted to the annular groove through the heat conduction hole 20 to preheat the butt joint of the fuel inlet pipe 2 and the bottom plate of the fuel tank. And the welding heat at the first welding torch 4 is conducted to the position of the second welding torch 18 through the heat conduction hole 20 to preheat the welding joint of the fuel inlet pipe 2 and the flange to prevent the generation of cold cracks. (5)Weld seam grinding: Adjust the bottom grinding block 13 and the positioning rod 9 downward. At the same time, rotate the semi-circular ring gear 12 and the positioning rod 9. The bottom grinding block 13 rotates and grinds the weld seam at the outer bottom of the fuel inlet pipe 2, and the limit grinding block 16 rotates and grinds the inner weld seam at the joint of the fuel inlet pipe 2 and the flange. (6)Unloading: The first vertical telescopic rod 10 retracts upward, driving the welded flange, fuel inlet pipe 2 and the bottom plate of the fuel tank to move upward. The positioning rod 9 moves upward, so that the positioning rod 9 is withdrawn from the fuel inlet pipe 2. Then adjust the horizontal telescopic rod 27 to loosen the flange and take away the bottom plate of the fuel tank for unloading.

[0043] A welding method using a transformer oil tank welding device can complete the processes of positioning and clamping of the flange, the inlet pipe 2 and the oil tank plate 3, grinding of the welding joints, welding, grinding of the weld seams, and unloading. Through one-time positioning and clamping, the processes of grinding, chip suction, welding, and grinding of the weld seams at multiple welding positions can be completed synchronously, simplifying the overall welding steps and improving the welding efficiency. In addition, during the process of grinding the welding joints, the welding joints can be preheated synchronously, taking advantage of the working characteristic of heat generation by grinding friction to reduce subsequent weld cracks. During the welding process on the outer side of the bottom of the inlet pipe 2, sealant is applied to the inner side of the bottom of the inlet pipe 2 at the same time. During the process of applying the sealant, the heat on the outer side of the inlet pipe 2 and the welding heat at the welding joint at the top of the inlet pipe 2 can be fully utilized, enabling the sealant to melt and thus penetrate into the gap between the inlet pipe 2 and the oil tank plate 3, improving the sealing and bonding effect. Additionally, during the welding processes at the upper and lower ends of the inlet pipe 2, the welding heats can conduct and influence each other, thereby preheating the welding positions and slow-cooling the weld seams after welding, reducing welding cracks, improving the welding quality, and making multiple welding positions related to each other.

[0044] Furthermore, between step (5) and step (6), the following step is also included: detecting the welding strength: turn on the second motor 24, and the second motor 24 gives a rotating force to the rotating plate 8. If the flange falls off the inlet pipe 2, it indicates that the welding strength between the flange and the inlet pipe 2 is insufficient; otherwise, it indicates that the welding strength between the flange and the inlet pipe 2 meets the initial inspection. If the inlet pipe 2 falls off the oil tank plate 3, it indicates that the welding strength between the inlet pipe 2 and the oil tank plate 3 is insufficient; otherwise, it indicates that the welding strength between the inlet pipe 2 and the oil tank plate 3 meets the initial inspection.

[0045] By setting a step of detecting the welding strength between step (5) and step (6), the welding strength can be detected by the welding device without specifically setting up a dedicated detection mechanism.

[0046] By also detecting the welding strength between step (5) and step (6), after welding, there is no need to reposition the welded parts and reuse the welding strength detection device. Using the existing welding structure, the welding strength of the welded parts can be detected. The structure is simple, practical and convenient, simplifying the detection steps of the welding strength.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. It should be understood that the specific embodiments described herein are only for understanding the present invention and are not used to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Claims

1. A transformer oil tank welding device for welding flanges, inlet oil pipes and oil tank plates, comprising a first welding torch and a workbench, characterized in that: Above the workbench, a top plate is connected by a support rod. A rotating plate is rotatably connected below the top plate. In the middle below the rotating plate, a position rod that can be lifted and rotated is connected. The diameter of the position rod is smaller than the inner diameter of the oil inlet pipe. On one side of the position rod, a cleaning brush strip capable of cleaning the oil inlet pipe is provided. On the left and right sides below the rotating plate, two first vertical telescopic rods are symmetrically arranged. Inside each of the two first vertical telescopic rods, an arc-shaped clamping block is connected through a horizontal telescopic rod. Below each arc-shaped clamping block, a semi-circular ring gear is rotatably connected. The two semi-circular ring gears can be combined into a circular ring gear. One of the semi-circular ring gears is connected to a driving mechanism for driving its rotation. The first welding torch is arranged below the semi-circular ring gear. Below each arc-shaped clamping block, a bottom grinding block is connected through a fourth vertical telescopic rod. The cross-sectional shape of the bottom grinding block is arc-shaped. When the arc-shaped clamping block clamps the flange, the bottom grinding block clamps the oil inlet pipe. The position rod is provided with a ring groove at the height corresponding to the weld between the oil inlet pipe and the fuel tank plate. A sealant hose is arranged in the ring groove. On the position rod, a "7"-shaped limit grinding block is provided. The limit grinding block is used for limiting the oil inlet pipe and the flange. A groove is provided on the position rod. A second welding torch is arranged in the groove. The second welding torch is used for welding the oil inlet pipe and the flange. The second welding torch is aligned with the docking position at the top of the oil inlet pipe and the inner side of the flange. A chip absorber is arranged below the semi-circular ring gear. A heat conduction hole is provided on the position rod at the position of the second welding torch. The other end of the heat conduction hole communicates with the annular groove.

2. The welding device for a transformer oil tank according to claim 1, wherein: On one side of the sealant hose in the ring groove, a solder paste gun, an electric soldering iron, and a grinding head are arranged in sequence.

3. A transformer oil tank welding device according to claim 2, characterized in that: The solder paste gun includes a push tube. A push piston is arranged in the push tube. The push piston is detachably connected to an electric push rod for driving its pushing and pulling.

4. A transformer oil tank welding device according to claim 1, characterized in that: A heat conduction rod is arranged in the heat conduction hole.

5. A transformer oil tank welding device according to claim 1, characterized in that: A positioning groove capable of clamping the fuel tank plate is provided on the workbench.

6. The welding device for a transformer oil tank according to claim 1, wherein: The driving mechanism includes a first motor. The output shaft of the first motor is connected to a small gear. The first motor is fixed on one of the first vertical telescopic rods. The small gear meshes with the semi-circular ring gear.

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

8. A transformer oil tank welding device according to claim 1, characterized in that: A third motor is arranged below the rotating plate. At the bottom of the output shaft of the third motor, a third vertical telescopic rod is provided. The third vertical telescopic rod is connected to the position rod.

9. A welding method using a transformer oil tank welding device as described in claim 1, characterized in that: It includes the following steps: (1) Preparation: Place the fuel tank plate on the workbench. Sleeve the oil inlet pipe on the position rod. Set the flange on the outside of the oil inlet pipe. Both the top of the oil inlet pipe and the flange are abutted against the limit 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. 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 are pressed against the fuel tank plate. At this time, the position rod is inserted into the oil inlet hole on the fuel tank plate. (2) Grinding: Rotate the rotating plate while rotating 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 grinds the fuel tank plate by friction, the oil inlet pipe and the fuel tank plate are ground by friction, the positioning rod cleans the oil inlet pipe, and at the same time, the limit grinding block grinds the oil inlet pipe and the end of the 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 fuel tank plate. (3) Chip suction: Turn on the chip suction device to adsorb the iron chips generated during grinding. (4) Welding: Adjust the first vertical telescopic rod and the third vertical telescopic rod downward together. Insert the positioning rod into the oil inlet hole of the fuel tank plate, and the oil inlet pipe abuts against the oil inlet hole of the fuel tank plate; Adjust the fourth vertical telescopic rod upward so that the bottom of the bottom grinding block leaves the fuel tank plate, and adjust the positioning rod upward so that the limit grinding block leaves the end of the oil inlet pipe. Rotate the semi-circular ring gear and the positioning rod. The rotation of the semi-circular ring gear drives the first welding torch to rotate, and the rotation of the positioning rod drives the second welding torch and the sealant pipe to rotate. At the same time, turn on the first welding torch, the second welding torch, and the sealant pipe. The first welding torch welds the oil inlet pipe and the fuel tank plate outside the oil inlet pipe. The second welding torch welds the oil inlet pipe and the flange at the upper end of the oil inlet pipe. The sealant extruded by the sealant pipe bonds and seals the butt joint of the oil inlet pipe and the fuel tank plate inside the oil inlet pipe. During the welding process of the first welding torch, the welding heat is conducted to the sealant pipe inside the oil inlet pipe, causing the sealant to melt and penetrate into the gap between the oil inlet pipe and the fuel tank plate for bonding and sealing; During the welding process of the second welding torch, the welding heat is conducted to the annular groove through the heat conduction hole to preheat the butt joint of the oil inlet pipe and the fuel tank bottom plate; The welding heat at the first welding torch is conducted to the position of the second welding torch through the heat conduction hole to preheat the welding joint of the oil inlet pipe and the flange to prevent cold cracks from occurring. (5) Weld grinding: Adjust the bottom grinding block and the positioning rod downward, and at the same time rotate the semi-circular ring gear and the positioning rod. The bottom grinding block rotates and grinds the weld at the outer bottom of the oil inlet pipe, and the limit grinding block rotates and grinds the internal weld at the oil inlet pipe and the flange. (6) Unloading: The first vertical telescopic rod retracts upward, driving the welded flange, oil inlet pipe, and fuel tank bottom plate to move upward. The positioning rod moves upward, causing the positioning rod to be withdrawn from the oil inlet pipe. Then adjust the horizontal telescopic rod to loosen the flange and remove the fuel tank bottom plate for unloading.

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

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