A ring main unit gas tank welding equipment

Abstract

This invention belongs to the field of welding processing technology, and specifically relates to a welding equipment for a ring main unit gas box. It includes a welding table and welding robots located on both sides of the welding table, as well as a positioning component, a welding residual stress relief component, and a sealing performance testing component fixed on the welding table. The welding residual stress relief component is located inside the positioning component; a transfer component is provided on the outer side of the welding table, and a top pressing component is fixed to the moving end of the transfer component, located directly above the positioning component. This invention integrates positioning, welding, stress relief, and sealing performance testing into one process. It relies on internal and external composite positioning to ensure the clamping accuracy of the sheet metal, utilizes weighing matching parameters to achieve precise adaptive vibration aging, and is equipped with an integrated positive pressure leak detection system. The entire process is automated, eliminating the need for workpiece transfer. While improving production efficiency and avoiding the risk of injury from impacts, it reduces leakage defects caused by welding deformation and residual stress from the source.

Description

Technical Field

[0001] This invention belongs to the field of welding processing technology, and in particular relates to a welding equipment for a ring main unit gas box. Background Technology

[0002] The gas box of a ring main unit is the core sealing component of a gas-insulated ring main unit. It houses high-voltage live components such as load switches, circuit breakers, and busbars, and is filled with insulating gas to ensure insulation performance. Therefore, its airtightness is of paramount importance. The welding quality directly determines the airtightness, insulation reliability, and service life of the ring main unit's gas box.

[0003] Currently, the main technical defects in the welding production of ring main unit gas boxes are as follows: 1. Traditional processes often involve manually splicing steel plates piece by piece and spot welding them with simple clamps. This operation not only results in high labor intensity and low production efficiency, but also makes it easy for thin stainless steel plates to deform during clamping. The gap between the joints and the amount of misalignment are difficult to control within 0.5mm, which directly affects the sealing performance of the weld. 2. The residual stress generated during the welding process will gradually be released under long-term internal pressure and temperature cycling, causing micro-cracks in the weld to appear and expand, which in turn affects the air box's sealing performance. Therefore, after welding, the air box needs to be transported to a special vibration aging equipment for treatment. However, this method has a long process flow time, and the residual stress has already begun to be released during the transportation process. Moreover, the excitation force and vibration time depend on the welder's experience. Improper parameter settings will either result in incomplete stress elimination leading to delayed leakage, or excessive excitation force leading to air box deformation. 3. After welding, the gas box needs to be moved to a dedicated leak detection station and tested with a helium mass spectrometer. The equipment investment cost is high, the detection cycle is long, and welding defects cannot be detected and repaired in the first place. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a welding device for the gas box of a ring main unit.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a ring main unit gas box welding equipment, including a welding table and welding manipulators located on both sides of the welding table, and further including a positioning component, a welding residual stress relief component and a sealing performance detection component fixed on the welding table, wherein the welding residual stress relief component is disposed inside the positioning component; The welding station is provided with a transfer component on its outer side, and the moving end of the transfer component is fixed with a top pressing component located directly above the positioning component.

[0006] In the above-mentioned ring main unit gas box welding equipment, the positioning component includes a hollow support frame fixed on one side of the upper end of the welding table. The outer wall of the hollow support frame is provided with multiple negative pressure suction holes. Multiple negative pressure pipes are fixedly connected to the inner side of the hollow support frame. The lower ends of the multiple negative pressure pipes penetrate the lower side of the welding table and are fixedly connected to the same hollow negative pressure plate. The lower end of the hollow negative pressure plate is fixedly connected to a suction pipe. A negative pressure pump is installed on the suction pipe and the negative pressure pump is fixed at the lower end of the welding table. Two first side plates and two second side plates, symmetrically arranged about the hollow support frame, are fixedly connected to the welding platform. Two first electric push rods are fixedly inserted on both ends of the second side plate, and the moving ends of the two first electric push rods are fixed with the same extrusion plate.

[0007] In the aforementioned ring main unit gas box welding equipment, the welding residual stress relief component includes a second electric push rod fixed on the upper end of the welding platform and located inside the hollow support frame. A push plate is fixed to the upper movable end of the second electric push rod. A vibrator is embedded in the top of the push plate. Two side plates are symmetrically fixed to the lower end of the push plate. Two third electric push rods are symmetrically fixed and inserted on the side plates. The movable ends of the two third electric push rods are fixed with the same elastic rubber plate.

[0008] In the aforementioned ring main unit gas box welding equipment, the sealing test component includes a rubber sealing gasket fixed on one side of the upper end of the welding platform. A pressure boosting pipe is fixedly inserted into the welding platform, penetrating the upper end of the rubber sealing gasket. A pressure boosting fan is installed on the pressure boosting pipe. The pressure boosting fan is fixed at the lower end of the welding platform. A barometer is also fixed on the welding platform, and the detection end of the barometer penetrates the upper end of the rubber sealing gasket.

[0009] In the aforementioned ring main unit gas box welding equipment, the transfer component includes two electric slide rails symmetrically arranged about the welding table. The moving ends of the two electric slide rails are fixed with the same U-shaped moving plate. The horizontal part of the U-shaped moving plate is symmetrically fitted with two fourth electric push rods. The lower moving ends of the two fourth electric push rods are fixed on the top pressing component.

[0010] In the aforementioned ring main unit gas box welding equipment, the top pressing assembly includes a lifting plate fixed to the lower moving end of two fourth electric push rods. The lower end of the lifting plate is symmetrically fixed with two support plates via multiple first connecting columns. A weighing sensor is fixed to the upper end of the support plate. The same fixing plate is movably sleeved on the outside of the multiple first connecting columns. The lower side of the fixing plate is fixed with the same pressing frame via multiple second connecting columns. The fixing plate is located directly above the weighing sensor.

[0011] In the aforementioned ring main unit gas box welding equipment, the lower center of the fixed plate is also fixed with the same electromagnetic adsorption plate by multiple third connecting columns, and the lower end of the electromagnetic adsorption plate is flush with the lower end of the pressing frame.

[0012] The aforementioned ring main unit gas box welding equipment also includes a PLC controller, which is electrically connected to the positioning component, the welding residual stress relief component, the sealing detection component, the transfer component, and the top pressing component.

[0013] Compared with existing technologies, the advantages of this invention are as follows: 1. This invention integrates four processes—positioning, welding, residual stress relief, and sealing test—into one, eliminating the need for manual handling and process flow. This achieves highly efficient automation of ring main unit gas box welding, resulting in higher production efficiency and avoiding weld cracking and personnel injury accidents caused by manual handling.

[0014] 2. The positioning component of the present invention adopts a combination of internal hollow support frame negative pressure adsorption and external extrusion limiting positioning method, which fixes the steel plate from the inside and outside of the air box at the same time, effectively improving the positioning accuracy and flatness of the steel plate, and effectively avoiding the deformation that is easily generated in the clamping process of stainless steel thin plate, enabling better full penetration sealing welding and ensuring welding quality.

[0015] 3. The welding residual stress relief component of the present invention is set inside the positioning component. After welding is completed, it automatically lifts the air box to relieve stress, so as to achieve more timely stress relief. The weight of the air box is automatically measured by the weighing sensor of the top pressing component. The PLC controller adaptively adjusts the excitation force and vibration time according to the preset algorithm to ensure that the residual stress relief is more accurate.

[0016] 4. The sealing test component of the present invention is set together with the welding station. After the stress is relieved, it is automatically transferred to the air box for positive pressure sealing test. The pressure change in the air box is monitored in real time by the barometer, which can quickly determine whether there is a leak in the air box, thereby realizing rapid repair welding. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the left-side stereoscopic structure of the present invention; Figure 2 This is a right-view stereoscopic structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the welding station of the present invention; Figure 4 This is a three-dimensional structural diagram of the installation of the positioning component and the welding residual stress relief component of the present invention; Figure 5 This is a top-view three-dimensional structural diagram of the positioning component of the present invention; Figure 6 This is a bottom-view three-dimensional structural diagram of the positioning component of the present invention; Figure 7 This is a three-dimensional structural schematic diagram of the welding residual stress relief component of the present invention; Figure 8 This is a three-dimensional structural schematic diagram of the sealing performance detection component of the present invention; Figure 9 This is a three-dimensional structural diagram of the top pressing component of the present invention; Figure 10 yes Figure 9 A three-dimensional structural diagram of the installation of the lifting plate and the weighing sensor; Figure 11 yes Figure 9 A three-dimensional structural diagram of the installation of the central fixing plate and the pressing frame.

[0018] In the diagram: 1. Welding table; 2. Welding robot; 3. Positioning assembly; 31. Hollow support frame; 32. Negative pressure suction hole; 33. Negative pressure pipe; 34. Hollow negative pressure plate; 35. Suction pipe; 36. Negative pressure pump; 37. First side support plate; 38. Second side support plate; 39. First electric actuator; 310. Extrusion plate; 4. Welding residual stress relief assembly; 41. Second electric actuator; 42. Push plate; 43. Vibrator; 44. Side plate; 45. Third electric actuator; 46. 5. Elastic rubber sheet; 6. Sealing test assembly; 7. Rubber sealing gasket; 8. Pressure boosting pipe; 9. Pressure boosting fan; 10. Barometer; 11. Transfer assembly; 12. Electric slide rail; 13. U-shaped moving plate; 24. Fourth electric push rod; 35. Top pressing assembly; 46. Lifting plate; 57. First connecting column; 68. Support plate; 79. Weighing sensor; 70. Fixing plate; 71. Second connecting column; 70. Pressing frame; 71. Third connecting column; 72. Electromagnetic adsorption plate. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] like Figures 1-3 As shown, a ring main unit gas box welding equipment includes a welding table 1 and welding manipulators 2 located on both sides of the welding table 1. It also includes a positioning component 3, a welding residual stress relief component 4 and a sealing performance detection component 5 fixed on the welding table 1. The welding residual stress relief component 4 is disposed inside the positioning component 3. The welding table 1 is provided with a transfer component 6 on its outer side, and the moving end of the transfer component 6 is fixed with a top pressing component 7 located directly above the positioning component 3.

[0021] likeFigures 4-6 As shown, the positioning component 3 includes a hollow support frame 31 fixed to one side of the upper end of the welding table 1. The outer wall of the hollow support frame 31 is provided with multiple negative pressure suction holes 32. Multiple negative pressure pipes 33 are fixedly connected to the inner side of the hollow support frame 31. The lower ends of the multiple negative pressure pipes 33 penetrate the lower side of the welding table 1 and are fixedly connected to the same hollow negative pressure plate 34. The lower end of the hollow negative pressure plate 34 is fixedly connected to a suction pipe 35. A negative pressure pump 36 is installed on the suction pipe 35. The negative pressure pump 36 is fixed to the lower end of the welding table 1. The negative pressure pump 36, together with the suction pipe 35, forms a negative pressure suction force in the hollow negative pressure plate 34. Then, through the multiple negative pressure pipes 33, a negative pressure suction force is formed in the hollow support frame 31. The multiple negative pressure suction holes 32 on the outer wall of the hollow support frame 31 provide negative pressure suction force, providing a fixing force for the subsequent positioning of the welded plate and ensuring the flatness of the welded plate. Two first side plates 37 and second side plates 38 are fixedly connected to the welding table 1, which are symmetrically arranged about the hollow support frame 31. Two first electric push rods 39 are fixedly inserted on both ends of the second side plate 38. The moving ends of the two first electric push rods 39 are fixed with the same extrusion plate 310. The cooperation between the hollow support frame 31, the first side plates 37 and the second side plates 38 can realize the rapid fixation of the welding plate. Furthermore, by pushing the extrusion plate 310 through the first electric push rods 39, a fixing force can be applied to the joint of the welding plate, ensuring that the joint of the welding plate is seamless and improving the subsequent welding quality and welding sealing.

[0022] like Figure 7 As shown, the welding residual stress relief component 4 includes a second electric push rod 41 fixed to the upper end of the welding table 1 and located inside the hollow support frame 31. A push plate 42 is fixed to the upper moving end of the second electric push rod 41. A vibrator 43 is embedded in the top of the push plate 42. Two side plates 44 are symmetrically fixed to the lower end of the push plate 42. Two third electric push rods 45 are symmetrically fixed on the side plates 44. The moving ends of the two third electric push rods 45 are fixed to the same elastic rubber plate 46. The gas box can be directly vibrated after welding, thereby eliminating the residual stress generated during the welding process and avoiding the problem of gas leakage and pressure loss due to stress release during long-term use.

[0023] like Figure 8As shown, the sealing test component 5 includes a rubber sealing gasket 51 fixed to one side of the upper end of the welding table 1. A pressure boosting pipe 52 is fixedly inserted into the welding table 1, penetrating the upper end of the rubber sealing gasket 51. A pressure boosting fan 53 is installed on the pressure boosting pipe 52 and fixed to the lower end of the welding table 1. A barometer 54 is also fixed on the welding table 1. The detection end of the barometer 54 penetrates the upper end of the rubber sealing gasket 51, enabling direct sealing test of the formed air box after welding. The rubber sealing gasket 51 can seal the opening end of the air box. Air is supplied to the air box through the pressure boosting pipe 52 by the pressure boosting fan 53, thereby increasing the air pressure in the air box to the set threshold and continuing to maintain the pressure. The barometer 54 confirms whether there is a change in the air pressure value, thereby confirming the sealing performance of the welded air box. If the sealing performance is insufficient, a feedback signal is promptly sent for repair welding, making the entire process faster.

[0024] like Figures 1-2 As shown, the transfer assembly 6 includes two electric slide rails 61 symmetrically arranged about the welding table 1. The moving ends of the two electric slide rails 61 are fixed with the same U-shaped moving plate 62. The horizontal part of the U-shaped moving plate 62 is symmetrically fitted with two fourth electric push rods 63. The lower moving ends of the two fourth electric push rods 63 are fixed on the top pressing assembly 7, which can quickly adjust the position of the top pressing assembly 7. The top pressing assembly 7 can also drive the welded gas box to be quickly transferred to the sealing test assembly 5 for sealing test.

[0025] like Figures 9-11 As shown, the top pressing assembly 7 includes a lifting plate 71 fixed to the lower moving end of two fourth electric push rods 63. The lower end of the lifting plate 71 is symmetrically fixed with two support plates 73 by multiple first connecting columns 72. The upper end of the support plate 73 is fixed with a weighing sensor 74. The same fixing plate 75 is movably sleeved on the outside of the multiple first connecting columns 72. The lower side of the fixing plate 75 is fixed with the same pressing frame 77 by multiple second connecting columns 76. The fixing plate 75 is located directly above the weighing sensor 74. The lower center of the fixing plate 75 is also fixed with the same electromagnetic adsorption plate 79 by multiple third connecting columns 78. The lower end of the electromagnetic adsorption plate 79 is flush with the lower end of the pressing frame 77, which can provide extrusion pressure on the top of the assembled air box to ensure the stability of the weld. The magnetism generated by the electromagnetic adsorption plate 79 when energized can attract and fix the air box, thereby cooperating with the transfer assembly 6 to drive the air box to quickly change position.

[0026] It also includes a PLC controller, which is electrically connected to the positioning component 3, the welding residual stress relief component 4, the sealing detection component 5, the transfer component 6, and the top pressing component 7, respectively.

[0027] The operating principle of the present invention is described as follows: Four gas box side steel plates are inserted into the gaps between the hollow support frame 31 and the first side fixing plate 37 and the second side fixing plate 38, respectively, so that the lower end face of the side steel plate contacts the upper surface of the welding table 1, and the inner side wall of the side steel plate is in contact with the outer side wall of the hollow support frame 31. The negative pressure pump 36 is started, and the negative pressure pump 36 generates negative pressure in the hollow negative pressure plate 34 through the suction pipe 35, and then forms negative pressure in the hollow support frame 31 through multiple negative pressure pipes 33. The negative pressure suction holes 32 on the outer wall of the hollow support frame 31 generate a uniform adsorption force on the inner side wall of the four side steel plates, and initially fix the side steel plates on the hollow support frame 31. Then, the first electric push rod 39 is activated, which pushes the extrusion plate 310 to move towards the side steel plate, applying uniform extrusion force to the outer wall of the connection between the four side steel plates, so that the connection between the side steel plates fits tightly, the gap between the joints is controlled within 0.3mm, and the misalignment is controlled within 0.2mm. The top steel plate of the air box is placed on the upper surface of the four side steel plates. The electric slide rail 61 is activated, which drives the U-shaped moving plate 62 to move directly above the positioning component 3. Then, the fourth electric push rod 63 is activated, which pushes the top pressing component 7 to move downward, so that the pressing frame 77 is pressed against the upper edge of the top steel plate, and the electromagnetic adsorption plate 79 contacts the upper surface of the top steel plate, completing the positioning and clamping of all the plates. The PLC controller starts two welding robots 2 to symmetrically weld all the welds of the gas box according to the preset welding program. After the welding is completed, the PLC controller supplies power to the electromagnetic adsorption plate 79, so that the electromagnetic adsorption plate 79 generates magnetism and firmly adsorbs to the steel plate on the top of the gas box. Then, the fourth electric push rod 63 is started, which drives the top pressing component 7 and the gas box to move upward together, so that the gas box is separated from the positioning component 3 and allowed to cool naturally. As the air box moves upward, due to the gravity of the air box, the fixed plate 75 slides upward along the first connecting column 72, and its upper end surface contacts the detection end of the weighing sensor 74. The weighing sensor 74 automatically measures the weight of the air box and transmits the weight data to the PLC controller. In this embodiment, the weight of the air box is 200kg as an example. The PLC controller calculates the working parameters of the vibrator 43 according to the preset algorithm: the initial excitation force is 2000N (10% of the workpiece weight), the vibration time is 25 minutes, and the vibration frequency is 65Hz. After the gas box cools to room temperature, the fourth electric actuator 63 drives the top pressing component 7 and the gas box to move downwards again, so that the gas box is placed on the welding table 1 again, and cuts off the power supply to the electromagnetic adsorption plate 79, disconnecting it from the gas box. The fourth electric actuator 63 then drives the top pressing component 7 to move upwards, breaking away from the pressure limit on the gas box. Then the second electric actuator 41 is activated to push the top push plate 42 upwards, so that the upper end face of the top push plate 42 contacts the top of the inner wall of the gas box, and lifts the gas box upwards, so that the gas box is completely separated from the positioning component 3. Then the third electric actuator 45 is activated to push the elastic rubber plate 46 towards the inner wall of the gas box, so that the elastic rubber plate 46 is tightly attached to the left and right inner walls of the gas box, fixing the gas box. The PLC controller starts the vibrator 43 and performs vibration aging treatment according to the calculated parameters. The initial excitation force is 2000N. After 10 minutes of vibration, if the amplitude is stable and there are no abnormalities, the PLC controller automatically increases the excitation force to 3000N (15% of the workpiece weight) and continues to vibrate for 15 minutes. During the vibration process, the vibration energy generated by the vibrator 43 is transmitted to the entire air box through the push plate 42, causing the air box to generate sub-resonance, thereby eliminating welding residual stress. After the vibration aging is completed, the vibrator 43 is turned off, the third electric push rod 45 is started to drive the elastic rubber plate 46 to reset, and the second electric push rod 41 is started to drive the top push plate 42 to reset, so that the air box descends together to the upper surface of the welding table 1. The air box is moved upward again by the action of the fourth electric push rod 63 and the electromagnetic adsorption plate 79, and the air box is moved to the top of the sealing test component 5 by the electric slide rail 61. Then the fourth electric push rod 63 is activated to push the air box downward so that the opening end of the air box is firmly pressed against the rubber sealing gasket 51 to seal the opening end of the air box. Start the booster fan 53 and fill the air box with dry air through the booster pipe 52, so that the air pressure in the air box gradually increases to 0.05MPa. When the barometer 54 detects that the air pressure in the air box reaches 0.05MPa, the PLC controller controls the booster fan 53 to stop and start maintaining the pressure for 10 minutes. During the pressure maintenance process, the barometer 54 monitors the air pressure change in the air box in real time and transmits the data to the PLC controller. If the air pressure does not drop within 10 minutes, it indicates that the air box is properly sealed, and the PLC controller sends a pass signal, waiting for material to be unloaded; if the air pressure drops, it indicates that there is a leak in the air box, and the PLC controller sends an alarm signal, prompting the operator to perform repair welding.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for a ring main unit gas box, comprising a welding table (1) and welding robots (2) located on both sides of the welding table (1), characterized in that, It also includes a positioning component (3) fixed on the welding table (1), a welding residual stress relief component (4) and a sealing detection component (5), wherein the welding residual stress relief component (4) is disposed inside the positioning component (3); The welding station (1) is provided with a transfer component (6) on its outer side, and the moving end of the transfer component (6) is fixed with a top pressing component (7) located directly above the positioning component (3).

2. The ring main unit gas box welding equipment according to claim 1, characterized in that, The positioning component (3) includes a hollow support frame (31) fixed on one side of the upper end of the welding table (1). The outer wall of the hollow support frame (31) is provided with a plurality of negative pressure suction holes (32). The inner side of the hollow support frame (31) is fixedly connected to a plurality of negative pressure pipes (33). The lower ends of the plurality of negative pressure pipes (33) penetrate the lower side of the welding table (1) and are fixedly connected to the same hollow negative pressure plate (34). The lower end of the hollow negative pressure plate (34) is fixedly connected to a suction pipe (35). A negative pressure pump (36) is installed on the suction pipe (35). The negative pressure pump (36) is fixed at the lower end of the welding table (1). The welding table (1) is fixedly connected to two first side plates (37) symmetrically arranged about the hollow support frame (31) on the left and right and a second side plate (38) symmetrically arranged in front and back. Two first electric push rods (39) are fixedly inserted on both ends of the second side plate (38), and the moving ends of the two first electric push rods (39) are fixed with the same extrusion plate (310).

3. The ring main unit gas box welding equipment according to claim 2, characterized in that, The welding residual stress relief assembly (4) includes a second electric push rod (41) fixed on the upper end of the welding table (1) and located inside the hollow support frame (31). The upper moving end of the second electric push rod (41) is fixed with a push plate (42). The top of the push plate (42) is fitted with a vibrator (43). The lower end of the push plate (42) is symmetrically fixed with two side plates (44). Two third electric push rods (45) are symmetrically fixed on the side plates (44). The moving ends of the two third electric push rods (45) are fixed with the same elastic rubber plate (46).

4. The ring main unit gas box welding equipment according to claim 1, characterized in that, The sealing test assembly (5) includes a rubber sealing gasket (51) fixed on one side of the upper end of the welding table (1). A pressure boosting pipe (52) is fixedly inserted on the welding table (1) and passes through the upper end of the rubber sealing gasket (51). A pressure boosting fan (53) is installed on the pressure boosting pipe (52). The pressure boosting fan (53) is fixed at the lower end of the welding table (1). A barometer (54) is also fixed on the welding table (1). The detection end of the barometer (54) passes through the upper end of the rubber sealing gasket (51).

5. The ring main unit gas box welding equipment according to claim 1, characterized in that, The transfer assembly (6) includes two electric slide rails (61) symmetrically arranged about the welding table (1). The moving ends of the two electric slide rails (61) are fixed with the same U-shaped moving plate (62). The horizontal part of the U-shaped moving plate (62) is symmetrically fitted with two fourth electric push rods (63). The lower moving ends of the two fourth electric push rods (63) are fixed on the top pressing assembly (7).

6. The ring main unit gas box welding equipment according to claim 5, characterized in that, The top pressing assembly (7) includes a lifting plate (71) fixed to the lower moving end of two fourth electric push rods (63). The lower end of the lifting plate (71) is symmetrically fixed with two support plates (73) by multiple first connecting columns (72). The upper end of the support plate (73) is fixed with a weighing sensor (74). The same fixing plate (75) is movably sleeved on the outside of the multiple first connecting columns (72). The lower side of the fixing plate (75) is fixed with the same pressing frame (77) by multiple second connecting columns (76). The fixing plate (75) is located directly above the weighing sensor (74).

7. The ring main unit gas box welding equipment according to claim 6, characterized in that, The lower center of the fixed plate (75) is also fixed with the same electromagnetic adsorption plate (79) by multiple third connecting columns (78), and the lower end of the electromagnetic adsorption plate (79) is flush with the lower end of the pressing frame (77).

8. The ring main unit gas box welding equipment according to claim 1, characterized in that, It also includes a PLC controller, which is electrically connected to the positioning component (3), the welding residual stress relief component (4), the sealing detection component (5), the transfer component (6), and the top pressing component (7), respectively.

Images