Synchronous lifting disassembly and assembly tool for low-voltage connection box of main transformer and disassembly and assembly method thereof

Abstract

The invention provides a main transformer low-voltage connection box synchronous lifting disassembly and assembly tool which comprises an oil cylinder jacking assembly, a supporting piece, a tray and a horizontal driving mechanism, the oil cylinder jacking assembly is detachably arranged on a main transformer box body and used for jacking a low-voltage connection box, and the supporting piece is detachably connected with the main transformer box body and used for supporting the low-voltage connection box. The tray is arranged on the supporting piece in a sliding mode and used for bearing the low-voltage connecting box, the fixing mechanism used for fixing the low-voltage connecting box is arranged on the tray, the horizontal driving mechanism is arranged on the supporting piece and used for driving the tray to move horizontally, and the problem of replacement of the sealing gasket of the low-voltage connecting box is solved.

Description

Technical Field

[0001] This invention relates to the field of main transformer seal replacement, and in particular to a synchronous lifting and disassembly tooling for the low-voltage connection box of a main transformer. Background Technology

[0002] The low-voltage connection box of the main transformer in a hydropower station is an important component connecting the low-voltage side of the main transformer to the external circuit. The low-voltage connection box is connected to the riser on the top of the main transformer housing. A sealing gasket is installed at the connection between the low-voltage connection box and the riser. When leakage or aging of the seal occurs at the connection between the low-voltage connection box and the riser, and the sealing gasket needs to be replaced, the low-voltage connection box and the riser need to be disassembled, the low-voltage connection box needs to be lifted, and then the sealing gasket needs to be replaced.

[0003] Because the main transformers of hydropower stations are usually located in the underground transformer room, which is a small space, large lifting equipment (cranes, etc.) cannot be used for hoisting operations. Therefore, special tools are needed to lift and lower the low-voltage connection box in order to disassemble and replace the gaskets. For example, the invention patent application with publication number CN118239421A discloses a lifting device for the low-voltage connection box of a three-phase combined transformer. This lifting device has hooks on the side wall of the low-voltage connection box, a support platform connected to the lifting lugs, a steel beam fixedly connected to the support platform, and a lifting cylinder on the steel beam. The upper end of the lifting cylinder is connected to the hooks, and the lifting cylinder drives the low-voltage connection box to rise and fall.

[0004] However, due to the limited height space in the main transformer room and for safety reasons, the lifting height of the lifting cylinder of the low-voltage connection box lifting device is relatively low. When the low-voltage connection box is lifted to the highest point, the space between the low-voltage connection box and the lifting seat is relatively narrow, making it inconvenient to replace the sealing gasket. Summary of the Invention

[0005] This invention provides a synchronous lifting and disassembly tool and method for the low-voltage connection box of a main transformer, which solves the problem of replacing the sealing gasket of the low-voltage connection box.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a synchronous lifting and disassembly fixture for the low-voltage connection box of a main transformer, comprising: The hydraulic cylinder lifting assembly is detachably mounted on the main transformer enclosure and is used to lift the low-voltage connection box. Support components are detachably connected to the main transformer housing. The tray is slidably mounted on the support and is used to support the low-voltage connection box. The tray is equipped with a fixing mechanism for fixing the low-voltage connection box. A horizontal drive mechanism is mounted on the support and is used to drive the pallet to move horizontally.

[0007] In a preferred embodiment, the hydraulic cylinder lifting assembly includes a lifting cylinder, a cylinder base, and a first clamping member. The bottom surface of the cylinder base abuts against the upper surface of the top cover of the main transformer housing. The first clamping member is used to clamp and fix the cylinder base to the top cover of the main transformer housing. The lifting cylinder is fixed on the cylinder base, and the piston rod of the lifting cylinder is provided with a support plate for supporting the low-voltage connection box.

[0008] In a preferred embodiment, the first clamping member includes a first U-shaped plate and a first locking bolt. One side wall of the first U-shaped plate abuts against the lower surface of the top cover of the main transformer box. The first U-shaped plate is provided with a first locking screw hole. The first locking bolt is screwed to the first U-shaped plate through the first locking screw hole. The end of the first locking bolt abuts against the base of the hydraulic cylinder.

[0009] In a preferred embodiment, the hydraulic cylinder lifting assembly further includes a reinforcing assembly, which includes an internally threaded tube and telescopic studs. Two telescopic studs are provided, which are respectively located at both ends of the internally threaded tube and screwed to the internally threaded tube. The telescopic studs are provided with connecting seats, and the connecting seats of the two telescopic studs are respectively hinged to the first U-shaped plate clamped and fixed on the adjacent main transformer box.

[0010] In a preferred embodiment, a connecting assembly is also included. The connecting assembly includes a main frame, a telescopic frame, and a second clamping member. Two sets of telescopic frames are provided and are telescopically connected to the main frame respectively. The main frame is provided with a telescopic drive member for driving the two sets of telescopic frames to move in opposite directions or back to back. The second clamping member is provided on the telescopic frame and is used to clamp and fix it to the reinforcing rib plate of the adjacent low-voltage connection box.

[0011] In a preferred embodiment, the support includes a support plate, a first upright plate, a second upright plate, and a third clamping member. The first and second upright plates are fixedly connected to the support plate. The bottom end of the first upright plate is used to contact the ground of the main transformer room. A horizontal plate is provided on the first upright plate. The horizontal plate is clamped and fixed to the reinforcing rib of the main transformer housing by the third clamping member. The second upright plate is clamped and fixed to the reinforcing rib of the main transformer housing by the third clamping member. The tray is slidably mounted on the support plate, and the horizontal drive mechanism is mounted on the support plate.

[0012] In a preferred embodiment, the fixing mechanism includes a slide and a lateral drive. The slide is slidably mounted on a tray and has a limiting plate that can abut against the side wall of the low-voltage connection box. The lateral drive is mounted on the tray and is used to drive the slide to move toward or away from the side wall of the low-voltage connection box. The fixing mechanism has two sets and is located on both sides of the low-voltage connection box.

[0013] In a preferred embodiment, a positioning mechanism is also included. The positioning mechanism includes a positioning seat, a sliding drive component, and a positioning pin. The tray is provided with a positioning hole. The positioning seat is slidably mounted on the support plate. The positioning pin is retractably mounted on the positioning seat and can be inserted into the positioning hole. The sliding drive component is mounted on the support plate and is used to drive the positioning seat to move to the position where the positioning pin coincides with the positioning hole.

[0014] In a preferred embodiment, the positioning mechanism further includes a first elastic element, a limiting pin, and a second elastic element. The positioning pin is slidably disposed on the positioning seat. The first elastic element acts on the positioning pin and provides a spring force to push the positioning pin toward the direction of the positioning hole. The positioning pin is provided with an annular groove. The limiting pin is slidably disposed on the positioning seat and can engage with the annular groove. The second elastic element acts on the limiting pin and provides a spring force to push the limiting pin toward the direction of the annular groove.

[0015] In a preferred embodiment, the positioning mechanism further includes a locking component, which includes a locking seat, a locking bolt, and an adjusting member. The support plate is provided with multiple locking holes. The locking seat is slidably mounted on the positioning seat and is provided with a locking screw hole. The adjusting member is mounted on the positioning seat and is used to drive the locking seat to slide until the locking screw hole is aligned with the locking hole. The locking bolt is screwed to the locking seat through the locking screw hole and can be inserted into the locking hole.

[0016] Including disassembly and assembly methods: S1. Install the hydraulic cylinder lifting assembly: Fix the hydraulic cylinder lifting assembly to the main transformer box, so that the lifting cylinder corresponds to the support position at the bottom of the low voltage connection box; S2. Separation of connection structure: Remove the connection structure between the low-voltage connection box and the main transformer box riser; S3. Lifting the low-pressure connection box: Start the lifting cylinder, and the piston rod will drive the pallet to lift the low-pressure connection box to the preset height that is completely separated from the lifting seat; S4. Install the support components: Connect the support components to the main transformer housing, and fix the support components to the reinforcing ribs of the main transformer housing using the third clamping component; S5. Lower and support the low-pressure connection box: Control the lifting cylinder to lower and place the low-pressure connection box stably on the tray; S6. Fixing the low-voltage connection box: Activate the lateral drive component of the fixing mechanism, and the two sets of fixing mechanisms respectively abut against the two side walls of the low-voltage connection box to achieve positioning and fixing; S7. Positioning mechanism pre-adjustment: The positioning seat moves so that the positioning pin is aligned with the positioning hole of the tray and inserted; S8. Horizontal movement away from the work area: Activate the horizontal drive mechanism to move the low-pressure connection box away from the area directly above the riser. S9. Complete the gasket replacement: Remove and replace the gasket at the connection between the riser and the low-pressure connection box; S10, Fixture Reset: The horizontal drive mechanism drives the pallet to move to the initial position, the pallet and the low-pressure connection box return to the initial position, the fixing mechanism releases the fixing of the low-pressure connection box, the support is removed, and the low-pressure connection box is connected to the lifting seat.

[0017] The beneficial effects of this invention are as follows: through the combined design of hydraulic cylinder lifting, pallet support, and horizontal translation, after the low-pressure connection box is lifted, the low-pressure connection box can be moved away from the top of the lifting seat by the horizontal drive mechanism, which completely releases the operating space in the area where the sealing gasket is located. It is not limited by the lifting height, which greatly reduces the difficulty of disassembling and replacing the sealing gasket and improves maintenance efficiency. All components adopt a detachable and modular design. The hydraulic cylinder lifting components, support components, etc. can be quickly disassembled and connected to the main transformer box in a detachable manner, without relying on large lifting equipment such as cranes. It is perfectly adapted to the narrow working environment of the main transformer room in the underground powerhouse of hydropower stations, and solves the problem that large equipment cannot enter the site in the existing technology. It is extremely practical. The hydraulic cylinder lifting assembly is firmly clamped to the top cover of the main transformer by the first clamping component, and the reinforcement component provides lateral support to the base of the adjacent hydraulic cylinder to prevent the clamping from loosening under heavy load and improve the lifting stability. The two sets of fixing mechanisms on the pallet clamp the low-pressure connection box from both sides through the limit plate to prevent the equipment from shaking or shifting during horizontal movement, thus reducing operational risks. A dedicated positioning mechanism is set up. Through the insertion and cooperation of the positioning pin and the positioning hole of the tray, as well as the assistance of the sliding drive and locking components, the low-voltage connection box can be accurately reset to the initial installation position after the gasket is replaced. This avoids problems such as poor sealing of subsequent connections and abnormal noise caused by reset deviation, and ensures the operational stability of the main transformer. The clamping components all adopt an adaptable structure of U-shaped plates and locking bolts, which can be precisely matched with existing structures such as the main transformer top cover, reinforcing ribs, and low-voltage connection box reinforcing ribs. No structural modifications to the main transformer or low-voltage connection box are required. It is compatible with low-voltage connection boxes of different specifications of main transformers, with strong versatility and compatibility, reducing application costs. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer in the embodiments of this application; Figure 2 This is a first-view sectional view of the synchronous lifting and disassembly tooling for the low-voltage connection box of the main transformer in the embodiments of this application; Figure 3 for Figure 2 A magnified view of part D in the middle; Figure 4for Figure 3 A magnified view of part D1 in the middle; Figure 5 for Figure 1 A magnified view of part A1 in the diagram; Figure 6 This is a cross-sectional view from the second perspective of the synchronous lifting and disassembly tooling for the low-voltage connection box of the main transformer in the embodiments of this application; Figure 7 for Figure 6 A magnified view of part C2 in the middle; Figure 8 for Figure 1 A magnified view of part A2 in the middle; Figure 9 This is a third-view sectional view of the synchronous lifting and disassembly tooling for the low-voltage connection box of the main transformer in the embodiments of this application; Figure 10 for Figure 9 A magnified view of part B in the middle section; Figure 11 for Figure 10 A magnified view of part B1 in the middle; Figure 12 for Figure 6 A magnified view of part C1.

[0020] In the figure: hydraulic cylinder lifting assembly 10; lifting hydraulic cylinder 11; piston rod 111; support plate 112; hydraulic cylinder base 12; first U-shaped plate 13; first locking screw hole 131; first locking bolt 14; abutment block 141; internal threaded pipe 15; telescopic stud 16; connecting seat 161; hinge shaft 17; Support component 20; support plate 21; first guide groove 211; clearance groove 212; locking hole 213; first guide rail 214; first vertical plate 22; horizontal plate 221; second vertical plate 23; third U-shaped plate 24; third locking screw hole 241; third locking bolt 25; Tray 30; Positioning plate 31; Positioning hole 311; Horizontal drive screw hole 32; Second guide rail 33; Connecting component 40; main frame 41; telescopic frame 42; telescopic drive screw sleeve 421; second U-shaped plate 43; second locking screw hole 431; second locking bolt 44; telescopic drive screw 45; guide sleeve 46; Fixed mechanism 50; slide table 51; transverse drive screw hole 511; transverse drive screw 52; transverse drive motor 53; limit plate 54; Positioning mechanism 60; positioning seat 61; sliding drive screw hole 611; first clearance groove 612; second clearance groove 613; second guide groove 614; positioning pin 62; annular groove 621; first annular boss 622; sliding drive screw 63; limit pin 64; second annular boss 641; first spring 65; second spring 66; locking seat 67; locking screw hole 671; adjusting screw hole 672; locking bolt 68; adjusting screw 69; Main transformer enclosure 70; top cover 71; reinforcing rib 72; riser seat 73; low voltage connection box 80; reinforcing rib 81; horizontal drive mechanism 90; horizontal drive screw 91; horizontal drive motor 92; bellows 100. Detailed Implementation

[0021] like Figure 1-12 Among them, a synchronous lifting and disassembly tooling for a low-voltage connection box of a main transformer and its disassembly and assembly method are disclosed, including a hydraulic cylinder lifting assembly 10, a support 20, a tray 30, a horizontal drive mechanism 90, a connecting assembly 40, and a positioning mechanism 60.

[0022] Reference Figures 1 to 4 In the prior art of this field, there are three main transformer enclosures 70. The top cover 71 of the main transformer enclosure 70 has sloping sides, and the side walls of the main transformer enclosure 70 are provided with reinforcing ribs 72. There are three low-voltage connection boxes 80, which correspond one-to-one with the main transformer enclosures 70. The low-voltage connection boxes 80 are connected to the riser seats 73 on the main transformer enclosures 70. The length of the middle low-voltage connection box 80 is greater than that of the low-voltage connection boxes 80 on both sides. Adjacent low-voltage connection boxes 80 are connected by corrugated pipes 100, and the side walls of the low-voltage connection boxes 80 are provided with reinforcing ribs 81.

[0023] The hydraulic cylinder lifting assembly 10 is detachably mounted on the main transformer housing 70 and is used to lift the low-voltage connection box 80. In an optional embodiment, the specific structure of the hydraulic cylinder lifting assembly 10 is as follows: The hydraulic cylinder lifting assembly 10 includes a lifting cylinder 11, a cylinder base 12, a first clamping member, and a reinforcing assembly. The bottom surface of the cylinder base 12 abuts against the upper surface of the top cover 71 of the main transformer housing 70. The first clamping member is used to clamp and fix the cylinder base 12 to the top cover 71 of the main transformer housing 70. The lifting cylinder 11 is fixed on the cylinder base 12. The piston rod 111 of the lifting cylinder 11 is provided with a support plate 112 for supporting the low-voltage connection box 80.

[0024] The first clamping component includes a first U-shaped plate 13 and a first locking bolt 14. One side wall of the first U-shaped plate 13 abuts against the lower surface of the top cover 71 of the main transformer housing 70. The first U-shaped plate 13 is provided with a first locking screw hole 131. The first locking bolt 14 is screwed to the first U-shaped plate 13 through the first locking screw hole 131. The end of the first locking bolt 14 abuts against the cylinder base 12. The end of the first locking bolt 14 is provided with a disc-shaped abutment block 141 to increase the contact area with the cylinder base 12.

[0025] Since the two sides of the top cover 71 of the main transformer housing 70 are sloping, when the cylinder base 12 is installed on the sloping top cover 71, the first clamping member is clamped on the sloping top cover 71. When the low-voltage connection box 80 is heavy, the first clamping member is at risk of loosening. Therefore, the first clamping member clamped on the adjacent main transformer housing 70 can be supported and reinforced by a reinforcing component to prevent the first clamping member from loosening. More specifically, the reinforcing component includes an internally threaded tube 15 and telescopic studs 16. There are two telescopic studs 16, which are respectively located at both ends of the internally threaded tube 15 and screwed to the internally threaded tube 15. The telescopic studs 16 are provided with connecting seats 161. The connecting seats 161 of the two telescopic studs 16 are respectively hinged to the first U-shaped plate 13 clamped and fixed on the adjacent main transformer housing 70 through hinge shafts 17.

[0026] Reference Figures 5 to 10 The support member 20 is detachably connected to the main transformer housing 70. In an optional embodiment, the specific structure of the support member 20 and its specific connection relationship with the main transformer housing 70 are as follows: The support member 20 includes a support plate 21, a first vertical plate 22, a second vertical plate 23 and a third clamping member. The first vertical plate 22 and the second vertical plate 23 are fixedly connected to the support plate 21. The bottom end of the first vertical plate 22 is used to contact the ground of the main transformer room. A horizontal plate 221 is provided on the first vertical plate 22. The horizontal plate 221 is clamped and fixed to the reinforcing rib 72 of the main transformer housing 70 by the third clamping member. The second vertical plate 23 is clamped and fixed to the reinforcing rib 72 of the main transformer housing 70 by the third clamping member.

[0027] The third clamping component includes a third U-shaped plate 24 and a third locking bolt 25. The third U-shaped plate 24 is fixedly connected to the horizontal plate 221 and the second vertical plate 23 respectively. One side wall of the third U-shaped plate 24 abuts against the reinforcing rib 72 of the main transformer housing 70. The third U-shaped plate 24 is provided with a third locking screw hole 241. The third locking bolt 25 is screwed to the third U-shaped plate 24 through the third locking screw hole 241. The end of the third locking bolt 25 abuts against the reinforcing rib 72 of the main transformer housing 70.

[0028] A first guide rail 214 is provided on the support plate 21, and the tray 30 is slidably disposed on the first guide rail 214 of the support member 20. The tray 30 is used to support the low-pressure connection box 80. A horizontal drive mechanism 90 is disposed on the support plate 21 of the support member 20 and is used to drive the tray 30 to move horizontally. In an optional embodiment, the specific structure of the horizontal drive mechanism 90 is as follows: the horizontal drive mechanism 90 includes a horizontal drive screw 91 and a horizontal drive motor 92. A horizontal drive screw hole 32 is provided on the tray 30. The horizontal drive screw 91 is rotatably disposed on the support plate 21 and is screwed to the tray 30 through the horizontal drive screw hole 32. The horizontal drive motor 92 is fixedly disposed on the support plate 21 and is connected to the horizontal drive screw 91.

[0029] The tray 30 is provided with a fixing mechanism 50 for fixing the low-voltage connection box 80. In an optional embodiment, the specific structure of the fixing mechanism 50 is as follows: The fixing mechanism 50 includes a slide 51 and a transverse drive member. The fixing mechanism 50 is provided in two sets and is located on both sides of the low-voltage connection box 80 respectively. The tray 30 is provided with a second guide rail 33. The slide 51 is slidably disposed on the second guide rail 33 of the tray 30. The slide 51 is provided with a limiting plate 54 that can abut against the side wall of the low-voltage connection box 80. The transverse drive member is disposed on the tray 30 and is used to drive the slide 51 to move toward or away from the side wall of the low-voltage connection box 80. More specifically, the transverse drive member includes a transverse drive screw 52 and a transverse drive motor 53. The slide 51 is provided with a transverse drive screw hole 511. The transverse drive screw 52 is rotatably disposed on the support plate 21 and is screwed to the slide 51 through the transverse drive screw hole 511. The transverse drive motor 53 is fixed on the tray 30 and connected to the transverse drive screw 52.

[0030] When it is necessary to replace the sealing gasket at the connection between the low-voltage connection box 80 and the riser seat 73, first install the hydraulic cylinder lifting assembly 10 on the main transformer box 70, then disassemble the low-voltage connection box 80 and the riser seat 73, and then lift the low-voltage connection box 80 using the hydraulic cylinder lifting assembly 10. Next, connect the support 20 to the main transformer box 70 and position the tray 30 below the low-voltage connection box 80. Then, lower the low-voltage connection box 80 using the hydraulic cylinder lifting assembly 10 and place it on the tray 30. Then, drive the transverse drive screw 52 to rotate using the transverse drive motor 53. The transverse drive screw 52 drives the slide table 51 to move towards the side wall of the low-voltage connection box 80 until the limiting plates 54 of the two sets of fixing mechanisms 50 abut against the side wall of the low-voltage connection box 80, thus fixing the low-voltage connection box 80.

[0031] Next, the horizontal drive motor 92 drives the horizontal drive screw 91 to rotate, which in turn moves the tray 30 horizontally, removing the low-pressure connection box 80 from above the riser 73, thus facilitating the replacement of the sealing gasket. In this embodiment, the tray 30 supports the low-pressure connection box 80 located in the middle, while the connecting assembly 40 fixes the low-pressure connection boxes 80 located on both sides to the low-pressure connection box 80 located in the middle, allowing the three low-pressure connection boxes 80 to move synchronously.

[0032] In an optional embodiment, the specific structure of the connecting component 40 is as follows: the connecting component 40 includes a main frame 41, a telescopic frame 42, and a second clamping member. The telescopic frame 42 is provided in two sets and is telescopically connected to the main frame 41 respectively. More specifically, the main frame 41 is provided with a guide sleeve 46, and the telescopic frame 42 is slidably engaged with the guide sleeve 46.

[0033] The main frame 41 is provided with a telescopic drive component for driving the two sets of telescopic frames 42 to move in opposite directions or back to back. More specifically, the telescopic drive component includes a telescopic drive screw 45. Each of the two sets of telescopic frames 42 is provided with a telescopic drive sleeve 421. The telescopic drive screw 45 is rotatably mounted on the main frame 41. The telescopic drive screw 45 is provided with two sets of external threads with opposite directions. The telescopic drive screw 45 is screwed to the telescopic drive sleeve 421 on the two sets of telescopic frames 42 through the two sets of external threads with opposite directions.

[0034] The second clamping member is provided on the telescopic frame 42 and is used to clamp and fix it to the reinforcing rib plate 81 of the adjacent low-voltage connection box 80. More specifically, the second clamping member includes a second U-shaped plate 43 and a second locking bolt 44. The second U-shaped plate 43 is fixedly connected to the telescopic frame 42. One side wall of the second U-shaped plate 43 abuts against the reinforcing rib plate 81 of the low-voltage connection box 80. The second U-shaped plate 43 is provided with a second locking screw hole 431. The second locking bolt 44 is screwed to the second U-shaped plate 43 through the second locking screw hole 431. The end of the second locking bolt 44 abuts against the reinforcing rib plate 81 of the low-voltage connection box 80.

[0035] When it is necessary to fix the low-voltage connection boxes 80 located on both sides to the low-voltage connection box 80 located in the middle through the connecting assembly 40, rotate the telescopic drive screw 45 to drive the two sets of telescopic frames 42 to move in opposite directions or back to back, thereby adjusting the overall length of the connecting assembly 40 to adapt to the distance between adjacent low-voltage connection boxes 80. Then, the second U-shaped plate 43 is snapped on the outside of the reinforcing rib plate 81, so that one side wall of the second U-shaped plate 43 abuts against the reinforcing rib plate 81 of the low-voltage connection box 80. Then, tighten the second locking bolt 44 so that its end abuts against the reinforcing rib plate 81 of the low-voltage connection box 80 to achieve a fixed connection.

[0036] After the sealing gasket is replaced, the horizontal drive mechanism 90 drives the tray 30 to move horizontally back to its initial position above the riser 73. To ensure that the position of the low-pressure connection box 80 is completely consistent with the initial position, it can be positioned by the positioning mechanism 60. In an optional embodiment, the specific structure of the positioning mechanism 60 is as follows: Reference Figures 10 to 12 The positioning mechanism 60 includes a positioning seat 61, a sliding drive component, a positioning pin 62, a first elastic component, a limit pin 64, a second elastic component, and a locking component. The tray 30 is provided with a positioning plate 31, which is provided with a positioning hole 311. The positioning seat 61 is slidably disposed on the support plate 21. More specifically, the support plate 21 is provided with a first guide groove 211, and the positioning seat 61 is slidably engaged with the first guide groove 211.

[0037] The positioning pin 62 is retractably mounted on the positioning seat 61 and can be inserted into the positioning hole 311. More specifically, the positioning pin 62 is slidably mounted on the positioning seat 61. The first elastic element acts on the positioning pin 62 and provides a spring force to push the positioning pin 62 toward the positioning hole 311. Furthermore, the first elastic element is a first spring 65. The positioning pin 62 is provided with a first annular boss 622, and the positioning seat 61 is provided with a first clearance groove 612 for avoiding the first annular boss 622. The first spring 65 is sleeved on the outside of the positioning pin 62, and the two ends of the first spring 65 abut against the end faces of the first annular boss 622 and the first clearance groove 612, respectively.

[0038] The positioning pin 62 is provided with an annular groove 621, and the limiting pin 64 is slidably disposed on the positioning seat 61 and can be engaged with the annular groove 621. The second elastic element acts on the limiting pin 64 and is used to provide elastic force to push the limiting pin 64 toward the annular groove 621. More specifically, the second elastic element is a second spring 66. The limiting pin 64 is provided with a second annular boss 641, and the positioning seat 61 is provided with a second clearance groove 613 for avoiding the second annular boss 641. The second spring 66 is sleeved on the outside of the limiting pin 64, and the two ends of the second spring 66 abut against the end faces of the second annular boss 641 and the second clearance groove 613, respectively.

[0039] A sliding drive component is mounted on the support plate 21 and is used to drive the positioning seat 61 to slide relative to the support plate 21. More specifically, the sliding drive component includes a sliding drive screw 63, and the positioning seat 61 is provided with a sliding drive screw hole 611. The sliding drive screw 63 is rotatably mounted on the support plate 21 and is screwed to the positioning seat 61 through the sliding drive screw hole 611. The sliding drive component can drive the positioning seat 61 to a position where the positioning pin 62 coincides with the positioning hole 311. The support plate 21 is provided with a clearance groove 212 for avoiding the positioning pin 62.

[0040] The locking assembly includes a locking seat 67, a locking bolt 68, and an adjusting component. The support plate 21 has multiple locking holes 213. The locking seat 67 is slidably mounted on the positioning seat 61. The locking seat 67 has a locking screw hole 671. The locking bolt 68 is screwed to the locking seat 67 through the locking screw hole 671 and can be inserted into the locking hole 213.

[0041] An adjusting component is mounted on the positioning seat 61 and is used to drive the locking seat 67 to slide until the locking screw hole 671 is aligned with the locking hole 213. More specifically, the adjusting component includes an adjusting screw 69. The positioning seat 61 is provided with a second guide groove 614. The locking seat 67 is slidably engaged with the second guide groove 614. The locking seat 67 is provided with an adjusting screw hole 672. The adjusting screw 69 is rotatably mounted on the positioning seat 61 and is screwed to the locking seat 67 through the adjusting screw hole 672.

[0042] The implementation principle of the synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer in this embodiment is as follows: When it is necessary to replace the sealing gasket at the connection between the low-voltage connection box 80 and the lifting seat 73, firstly, the hydraulic cylinder lifting assembly 10 is installed on the main transformer housing 70. Then, the low-voltage connection box 80 is disassembled from the lifting seat 73, and then the low-voltage connection box 80 is lifted by the hydraulic cylinder lifting assembly 10. The low-voltage connection boxes 80 located on both sides are fixedly connected to the low-voltage connection box 80 located in the middle by the connecting assembly 40, so that the three low-voltage connection boxes 80 can move synchronously. Next, the support member 20 is connected to the main transformer housing 70, and the tray 30 is positioned below the low-voltage connection box 80. Then, the low-voltage connection box 80 is lowered by the hydraulic cylinder lifting assembly 10, and the low-voltage connection box 80 is placed on the tray 30. Finally, the low-voltage connection box 80 is fixed by the fixing mechanism 50.

[0043] Next, rotate the sliding drive screw 63, which moves the positioning seat 61 to the position where the positioning pin 62 coincides with the positioning hole 311. At this point, under the elastic force of the first spring 65, the positioning pin 62 is pushed into the positioning hole 311. Then, rotate the adjusting screw 69, which moves the locking seat 67 to the position where the locking screw hole 671 aligns with a certain locking hole 213. Then, rotate the locking bolt 68 to insert it into the locking hole 213, locking the positioning seat 61 and preventing the operator from accidentally touching the sliding drive screw 63, which could cause the positioning seat 61 to shift. Next, pull the positioning pin 62 to disengage it from the positioning hole 311. During the pulling of the positioning pin 62, when the annular groove 621 is aligned with the limiting pin 64, the limiting pin 64 is pushed to engage with the annular groove 621 under the elastic force of the second spring 66, thus limiting the positioning pin 62 and preventing the subsequent tray 30 from interfering with the positioning pin 62 when moving horizontally.

[0044] Next, the horizontal drive mechanism 90 drives the tray 30 to move horizontally, removing the low-pressure connection box 80 from above the riser 73. The sealing gasket is then replaced. After the gasket replacement, the horizontal drive mechanism 90 drives the tray 30 back to its initial position. When the positioning hole 311 is about to align with the positioning pin 62, the limit pin 64 is pulled out of the annular groove 621, causing the positioning pin 62 to move under the force of the first spring 65 until it contacts the bottom wall of the positioning plate 31. When the tray 30 moves to the position where the positioning hole 311 and the positioning pin 62 are completely aligned, the first spring 65 pushes the positioning pin 62 into the positioning hole 311, locking the position of the tray 30. At this point, the tray 30 and the low-pressure connection box 80 return to their initial positions.

[0045] Next, the fixing mechanism 50 is released from fixing the low-pressure connection box 80, and the low-pressure connection box 80 is lifted by the hydraulic cylinder lifting assembly 10 so that it is lifted off the tray 30. Then, the support member 20 and other components are removed, and the low-pressure connection box 80 is lowered by the hydraulic cylinder lifting assembly 10 and connected to the lifting seat 73.

[0046] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A synchronous lifting and disassembly fixture for the low-voltage connection box of a main transformer, characterized in that: The device includes a hydraulic cylinder lifting assembly (10), a support member (20), a tray (30), and a horizontal drive mechanism (90). The hydraulic cylinder lifting assembly (10) is detachably mounted on the main transformer housing (70) and is used to lift the low-voltage connection box (80). The support member (20) is detachably connected to the main transformer housing (70). The tray (30) is slidably mounted on the support member (20) and is used to support the low-voltage connection box (80). The tray (30) is provided with a fixing mechanism (50) for fixing the low-voltage connection box (80). The horizontal drive mechanism (90) is mounted on the support member (20) and is used to drive the tray (30) to move horizontally.

2. The synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer according to claim 1, characterized in that: The hydraulic cylinder lifting assembly (10) includes a lifting cylinder (11), a cylinder base (12), and a first clamping member. The bottom surface of the cylinder base (12) abuts against the upper surface of the top cover (71) of the main transformer housing (70). The first clamping member is used to clamp and fix the cylinder base (12) to the top cover (71) of the main transformer housing (70). The lifting cylinder (11) is fixed on the cylinder base (12). The piston rod (111) of the lifting cylinder (11) is provided with a support plate (112) for supporting the low-voltage connection box (80).

3. The synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer according to claim 2, characterized in that: The first clamping component includes a first U-shaped plate (13) and a first locking bolt (14). One side wall of the first U-shaped plate (13) abuts against the lower surface of the top cover (71) of the main transformer housing (70). The first U-shaped plate (13) is provided with a first locking screw hole (131). The first locking bolt (14) is screwed to the first U-shaped plate (13) through the first locking screw hole (131). The end of the first locking bolt (14) abuts against the cylinder base (12).

4. The synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer according to claim 3, characterized in that: The hydraulic cylinder lifting assembly (10) also includes a reinforcing assembly, which includes an internal threaded tube (15) and a telescopic stud (16). There are two telescopic studs (16), which are respectively located at both ends of the internal threaded tube (15) and are screwed to the internal threaded tube (15). The telescopic studs (16) are provided with connecting seats (161), and the connecting seats (161) of the two telescopic studs (16) are respectively hinged to the first U-shaped plate (13) clamped and fixed on the adjacent main transformer box (70).

5. The synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer according to claim 1, characterized in that: It also includes a connecting component (40), which includes a main frame (41), a telescopic frame (42), and a second clamping member. The telescopic frame (42) has two sets, which are telescopically connected to the main frame (41) respectively. The main frame (41) is provided with a telescopic drive member for driving the two sets of telescopic frames (42) to move in opposite directions or back to back. The second clamping member is provided on the telescopic frame (42) and is used to clamp and fix it with the reinforcing rib plate (81) of the adjacent low-voltage connection box (80).

6. The synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer according to claim 1, characterized in that: The support member (20) includes a support plate (21), a first upright plate (22), a second upright plate (23) and a third clamping member. The first upright plate (22) and the second upright plate (23) are fixedly connected to the support plate (21). The bottom end of the first upright plate (22) is used to contact the ground of the main transformer room. A horizontal plate (221) is provided on the first upright plate (22). The horizontal plate (221) is clamped and fixed to the reinforcing rib (72) of the main transformer box (70) by the third clamping member. The second upright plate (23) is clamped and fixed to the reinforcing rib (72) of the main transformer box (70) by the third clamping member. The tray (30) is slidably disposed on the support plate (21). The horizontal drive mechanism (90) is disposed on the support plate (21).

7. The synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer according to claim 6, characterized in that: Also includes The positioning mechanism (60) includes a positioning seat (61), a sliding drive and a positioning pin (62). The tray (30) is provided with a positioning hole (311). The positioning seat (61) is slidably mounted on the support plate (21). The positioning pin (62) is retractably mounted on the positioning seat (61) and can be inserted into the positioning hole (311). The sliding drive is mounted on the support plate (21) and is used to drive the positioning seat (61) to move to the position where the positioning pin (62) coincides with the positioning hole (311).

8. The synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer according to claim 7, characterized in that: The positioning mechanism (60) also includes a first elastic element, a limiting pin (64) and a second elastic element. The positioning pin (62) is slidably disposed on the positioning seat (61). The first elastic element acts on the positioning pin (62) and is used to provide a spring force to push the positioning pin (62) to move toward the positioning hole (311). The positioning pin (62) is provided with an annular groove (621). The limiting pin (64) is slidably disposed on the positioning seat (61) and can be engaged with the annular groove (621). The second elastic element acts on the limiting pin (64) and is used to provide a spring force to push the limiting pin (64) to move toward the annular groove (621).

9. The synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer according to claim 7, characterized in that: The positioning mechanism (60) also includes a locking assembly, which includes a locking seat (67), a locking bolt (68), and an adjusting member. The support plate (21) is provided with multiple locking holes (213). The locking seat (67) is slidably mounted on the positioning seat (61). The locking seat (67) is provided with a locking screw hole (671). The adjusting member is mounted on the positioning seat (61) and is used to drive the locking seat (67) to slide until the locking screw hole (671) is aligned with the locking hole (213). The locking bolt (68) is screwed to the locking seat (67) through the locking screw hole (671) and can be inserted into the locking hole (213).

10. The disassembly and assembly method of the synchronous lifting and disassembly fixture for the low-voltage connection box of the main transformer according to any one of claims 1-10, characterized in that: S1. Install the hydraulic cylinder lifting assembly: Fix the hydraulic cylinder lifting assembly (10) on the main transformer box (70) so that the lifting cylinder (11) corresponds to the bottom support position of the low voltage connection box (80); S2, Separate connection structure: Remove the connection structure between the low-voltage connection box (80) and the main transformer box (70) riser (73); S3, Lifting the low-pressure connection box: Start the lifting cylinder (11), the piston rod (111) drives the pallet (112) to lift the low-pressure connection box (80) to the preset height that is completely separated from the lifting seat (73); S4. Install the support component: Connect the support component (20) to the main transformer housing (70), and fix the support component (20) and the reinforcing rib (72) of the main transformer housing (70) by the third clamping component. S5. Lower and support the low-pressure connection box: Control the lifting cylinder (11) to fall back and place the low-pressure connection box (80) stably on the tray (30); S6. Fixing the low-voltage connection box: Start the horizontal drive of the fixing mechanism (50), and the two sets of fixing mechanisms (50) abut against the two side walls of the low-voltage connection box (80) respectively to achieve positioning and fixing; S7. Positioning mechanism pre-adjustment: The positioning seat (61) moves so that the positioning pin (62) is aligned with the positioning hole (311) of the tray (30) and inserted; S8. Horizontal movement away from the work area: Start the horizontal drive mechanism (90) to move the low-pressure connection box (80) away from the area directly above the riser (73); S9. Complete the gasket replacement: Remove and replace the gasket at the connection between the riser (73) and the low-pressure connection box (80); S10, Tooling reset: The horizontal drive mechanism (90) drives the tray (30) to move to the initial position, the tray (30) and the low-pressure connection box (80) return to the initial position, the fixing mechanism (50) releases the fixing of the low-pressure connection box (80), the support (20) is removed, and the low-pressure connection box (80) is connected to the lifting seat (73).

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