Jacking monitoring device and control method for low-voltage connection box of three-phase combined transformer

Abstract

The invention discloses a three-phase combined transformer low-voltage connection box jacking monitoring device and a control method, the three-phase combined transformer low-voltage connection box jacking monitoring device comprises a hydraulic jacking assembly, the hydraulic jacking assembly comprises a supporting piece, a jacking oil cylinder, a support, a supporting plate, a pressure sensor and a displacement sensor, the pressure sensor is fixedly arranged on a piston rod of the jacking oil cylinder, and the displacement sensor is fixedly arranged on the supporting piece; the support is connected with the measuring end of the pressure sensor, the supporting plate is arranged on the support in a deflectable mode, and the displacement sensor is used for monitoring the displacement value of a piston rod of the jacking oil cylinder. And the electronic level meter is fixedly arranged on the low-voltage connection box. According to a measurement signal fed back to the control equipment by the electronic level meter, the low-pressure connecting box is adjusted to be in a horizontal state, and the jacking height is accurately controlled through the displacement sensor in the jacking process, so that the jacking oil cylinders of the multiple hydraulic jacking assemblies maintain synchronous jacking; therefore, one-way or multi-way inclination of the low-voltage connection box in the jacking process is avoided.

Description

Technical Field

[0001] This invention relates to the field of three-phase combined transformer maintenance equipment technology, and in particular to a monitoring device and control method for the lifting of the low-voltage connection box of a three-phase combined transformer. Background Technology

[0002] The low-voltage connection box of the main transformer in a hydropower station is a crucial component connecting the low-voltage side of the main transformer to the external circuit. The low-voltage connection box connects to a riser on the top of the main transformer housing. A sealing gasket is installed at the connection point between the low-voltage connection box and the riser. When leakage occurs or the seal ages and needs replacement, the low-voltage connection box must be disassembled from the riser before a lifting device is used to lift the low-voltage connection box. For example, patent application CN118239421A discloses a lifting device for the low-voltage connection box of a three-phase combined transformer. This 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 mounted 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 be lifted.

[0003] Its shortcomings are as follows: When lifting the low-voltage connection box of the aforementioned three-phase combined transformer, multiple lifting cylinders need to be used simultaneously. During lifting, factors such as hydraulic system pressure fluctuations and differences in cylinder wear can easily lead to inconsistent thrust or stroke at each lifting point, resulting in stress imbalance in various parts of the low-voltage connection box. This can cause plastic deformation such as twisting and bending, and may even lead to cracking in weak parts of the low-voltage connection box, such as flanges and welds, due to localized stress concentration. Furthermore, due to uneven ground and differences in the initial height of the cylinders, the low-voltage connection box may tilt in one or more directions during the lifting process, resulting in a shift in the position of the low-voltage connection box before and after lifting. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a monitoring device and control method for lifting the low-voltage connection box of a three-phase combined transformer, which solves the problems of unbalanced force on various parts of the low-voltage connection box and possible unidirectional or multidirectional tilting of the low-voltage connection box during the lifting process when the lifting device of the low-voltage connection box of the three-phase combined transformer lifts the low-voltage connection box in the related art.

[0005] To achieve the above-mentioned technical features, the objective of this invention is as follows: A monitoring device for the lifting of a low-voltage connection box of a three-phase combined transformer, comprising: A hydraulic jacking assembly includes a support member, a jacking cylinder, a support, a tray, a pressure sensor, and a displacement sensor. The support member is detachably fixed to the transformer housing. The jacking cylinder is mounted on the support member. The pressure sensor is fixed to the piston rod of the jacking cylinder. The support is connected to the measuring end of the pressure sensor. The tray is rotatably mounted on the support and is used to support the low-voltage connection box. The displacement sensor is used to monitor the displacement value of the piston rod of the jacking cylinder. An electronic level, which is fixed on a low-voltage connection box; A hydraulic pump station, which is connected to the lifting cylinder; The control device is electrically connected to the hydraulic pump station, pressure sensor, displacement sensor and electronic level.

[0006] Optionally, the upper surface of the support is provided with an arc groove, the bottom of the support plate is provided with a convex arc surface corresponding to the arc groove, the support plate is in contact with the inner wall of the arc groove through the convex arc surface, and the support is provided with a limiting part for restricting the separation of the support plate from the support.

[0007] Optionally, the support includes 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 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 housing. 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 cylinder base. The lifting cylinder is fixed on the cylinder base.

[0008] Optionally, the support member further 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.

[0009] Optionally, the support member further includes an arc-shaped plate. The cylinder base is symmetrically arranged on both sides of the riser seat of the transformer housing. The arc-shaped plate is hung on the outside of the riser seat, and the two ends of the arc-shaped plate are respectively fixedly connected to the cylinder base symmetrically arranged on both sides of the riser seat.

[0010] Optionally, a protective mechanism is also included, comprising a base support, a base, a horizontal plate, a lateral movement assembly, a diagonal brace, and a swing assembly. The base is disposed on the base support, the horizontal plate is slidably disposed on the base, the lateral movement assembly is disposed on the base and is used to drive the horizontal plate to move below the low-pressure connection box after the hydraulic lifting assembly lifts the low-pressure connection box, the diagonal brace is rotatably disposed on the base, and the swing assembly is disposed on the base and is used to drive the diagonal brace to rotate to support below the horizontal plate after the lateral movement assembly drives the horizontal plate to move below the low-pressure connection box.

[0011] Optionally, the protective mechanism further includes a transmission rod, a push block, and a first elastic element. The transmission rod is slidably mounted on the base along the vertical direction. The push block is detachably fixed to the low-pressure connection box. When the push block rises with the low-pressure connection box, it can push the transmission rod upward. The first elastic element is used to push the transmission rod downward. The transmission rod is connected to the transverse moving assembly and the swinging assembly respectively. When the transmission rod slides vertically, it can drive the horizontal plate to move through the transverse moving assembly and drive the diagonal brace to rotate through the swinging assembly.

[0012] Optionally, the transverse assembly includes a first primary gear and a first secondary gear, which are rotatably mounted on the base and mesh with each other. The transmission rod is provided with a first rack that meshes with the first primary gear, and the transverse plate is provided with a second rack that meshes with the first secondary gear. The side of the transmission rod is provided with a protrusion, and the push block is capable of pushing the protrusion.

[0013] Optionally, the swing assembly includes a second main gear and a second auxiliary gear, which are rotatably mounted on the base and mesh with each other. The transmission rod is provided with a gear row that meshes with the second main gear, and a worm is coaxially mounted on the second auxiliary gear. The diagonal brace is rotatably mounted on the base via a pivot, and a worm wheel that meshes with the worm is mounted on the pivot.

[0014] Optionally, the protective mechanism further includes a locking component, which includes a wedge block and a second elastic element. The transmission rod is provided with a locking pin, and the locking pin is provided with an annular groove. The wedge block is slidably disposed on the base. The second elastic element acts on the wedge block and can push the wedge block to engage with the annular groove when the transmission rod moves to the point where the annular groove of the locking pin aligns with the wedge block.

[0015] The control method of the three-phase combined transformer low-voltage connection box lifting monitoring device is used to lift the low-voltage connection box of the main transformer. The control method includes the following steps: S1. Disassemble the low-voltage connection box from the transformer box's lifting bracket; S2. By controlling the piston rods of multiple lifting cylinders to extend simultaneously through the control equipment, the pallets of multiple hydraulic lifting components are raised synchronously. S3. The load borne by the pallet is measured by the pressure sensor. When the pressure sensor values ​​of multiple hydraulic lifting components reach the set values, the piston rod of each lifting cylinder is controlled to remain stationary. S3. Control the piston rod of the lifting cylinder to raise and lower through the control equipment, adjust the height of each hydraulic lifting component support plate, and adjust the low pressure connection box to a horizontal state according to the measurement signal fed back to the control equipment by the electronic level. After adjusting to a horizontal state, control the piston rod of each lifting cylinder to keep it stationary. S4. The displacement sensor measures the length and resets it to the reference value. The control equipment controls the piston rod of the lifting cylinder to rise and lift the low-pressure connection box. During the lifting process, the displacement sensor precisely controls the lifting height so that the lifting cylinders of multiple hydraulic lifting components keep lifting synchronously and lift the low-pressure connection box to the predetermined height. During the lifting process, the transmission rod moves upward with the jacking block, and the transmission rod drives the horizontal plate to gradually slide and extend below the low-pressure connection box through the transverse moving assembly; at the same time, the transmission rod drives the diagonal brace to gradually rotate through the swing assembly and support it on the lower side of the extended end of the horizontal plate.

[0016] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art: When the low-pressure connection box needs to be lifted, the control equipment simultaneously extends the piston rods of multiple lifting cylinders, causing the pallets of multiple hydraulic lifting components to rise synchronously and contact the bottom surface of the low-pressure connection box. Pressure sensors measure the load borne by the pallets. Once the pressure sensor readings of multiple hydraulic lifting components reach their set values, the piston rods of each lifting cylinder are kept stationary, ensuring balanced stress on all parts of the low-pressure connection box and preventing twisting, bending, cracking, or other phenomena. Next, the control equipment raises and lowers the piston rods of the lifting cylinders, adjusting the height of each hydraulic lifting component pallet. Based on the measurement signals fed back to the control equipment from the electronic level, the low-pressure connection box is adjusted to a level position. Once the low-pressure connection box is level, the piston rods of each lifting cylinder are kept stationary. Next, the piston rod of the lifting cylinder is raised by the control equipment to lift the low-pressure connection box. During the lifting process, the lifting height is precisely controlled by the displacement sensor to keep the lifting cylinders of multiple hydraulic lifting components lifting synchronously and lifting the low-pressure connection box to the predetermined height. This avoids the low-pressure connection box from tilting in one or more directions during the lifting process and ensures that the position of the low-pressure connection box remains consistent before and after the lifting. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the structure of the monitoring device for the lifting of the low-voltage connection box of the three-phase combined transformer in the embodiments of this application.

[0019] Figure 2 This is a first-view cross-sectional view of the three-phase combined transformer low-voltage connection box lifting monitoring device in the embodiments of this application.

[0020] Figure 3 for Figure 2 A magnified view of part B1 in the diagram.

[0021] Figure 4 for Figure 2 A magnified view of part B2 in the diagram.

[0022] Figure 5 This is a cross-sectional view from the second perspective of the monitoring device for the lifting of the low-voltage connection box of the three-phase combined transformer in the embodiments of this application.

[0023] Figure 6 for Figure 5 A magnified view of part C in the diagram.

[0024] Figure 7 This is a partial cross-sectional view of the hydraulic lifting assembly in an embodiment of this application.

[0025] Figure 8 This is a cross-sectional view from the third perspective of the three-phase combined transformer low-voltage connection box lifting monitoring device in the embodiments of this application.

[0026] Figure 9 for Figure 8 A magnified view of part D in the middle.

[0027] Figure 10 This is a cross-sectional view from the fourth perspective of the three-phase combined transformer low-voltage connection box lifting monitoring device in the embodiments of this application.

[0028] Figure 11 for Figure 10 A magnified view of part A in the diagram.

[0029] Figure 12 for Figure 6 A magnified view of part C1.

[0030] Figure Labels 10. Hydraulic lifting assembly; 11. Cylinder base; 12. First U-shaped plate; 13. First locking bolt; 14. Lifting cylinder; 141. Piston rod; 15. Support; 151. Arc groove; 152. Column; 153. Limiting boss; 16. Support plate; 161. Clearance groove; 162. Groove; 17. Pressure sensor; 18. Pull-wire sensor; 181. Pull rope; 19. Internally threaded pipe; 110. Telescopic stud; 1101. Connecting seat; 1102. Hinge shaft; 112. Arc plate; 113. Connecting plate; 20. Base support component; 21. Base support frame; 22. Second U-shaped plate; 23. Second locking bolt; 30. Base; 31. Guide column; 32. Upper stop block; 33. Lower stop block; 34. Pin hole; 35. Guide groove; 40. Horizontal plate; 41. Slide rail; 42. Second rack; 50. Lateral movement assembly; 51. First main gear; 52. First auxiliary gear; 60. Diagonal brace; 61. Pivot; 62. Worm gear; 70. Swing assembly; 71. Second main gear; 72. Second auxiliary gear; 73. Worm; 80. Transmission rod; 81. Slide plate; 82. First rack; 83. Protrusion; 84. Gear rack; 85. Pin seat; 86. Locking pin; 861. Ring groove; 90. Push block; 91. Third U-shaped plate; 92. Third locking bolt; 100. Locking assembly; 101. Wedge block; 102. Second spring; 103. Rod body; 104. Handle; 120. Electronic level; 200. First spring; 300. Transformer housing; 301. Top cover; 302. Reinforcing rib; 303. Lifting seat; 400. Low-voltage connection box; 401. Reinforcing rib. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0033] Example 1: This embodiment provides a monitoring device for the lifting of the low-voltage connection box of a three-phase combined transformer, including a hydraulic lifting assembly 10, an electronic level 120, a hydraulic pump station, and control equipment.

[0034] Reference Figures 1 to 7 The hydraulic lifting assembly 10 includes a support member, a lifting cylinder 14, a support 15, a support plate 16, a pressure sensor 17, and a displacement sensor. The support member is detachably fixed to the transformer housing 300. The support member includes a cylinder base 11, a first clamping member, an internal threaded tube 19, a telescopic stud 110, and an arc plate 112. The bottom surface of the cylinder base 11 abuts against the upper surface of the top cover 301 of the main transformer housing 300. The first clamping member includes a first U-shaped plate 12 and a first locking bolt 13. One side wall of the first U-shaped plate 12 abuts against the lower surface of the top cover 301 of the main transformer housing 300. The first U-shaped plate 12 is provided with a first locking screw hole. The first locking bolt 13 is screwed to the first U-shaped plate 12 through the first locking screw hole. The end of the first locking bolt 13 abuts against the cylinder base 11. The lifting cylinder 14 is fixed to the cylinder base 11 of the support member.

[0035] In the prior art, the top cover 301 of the main transformer housing 300 has inclined surfaces on both sides. In an optional embodiment, multiple cylinder bases 11 are provided, and a portion of the cylinder bases 11 are clamped and fixed to the inclined surface of the top cover 301 by a first clamping member. When the first clamping member is clamped to the inclined surface of the top cover 301, the first clamping member clamped and fixed to the adjacent main transformer housing 300 can be supported and reinforced by the internal threaded tube 19 and the telescopic stud 110 to prevent the first clamping member from sliding down the inclined surface of the top cover 301. More specifically, there are two telescopic studs 110, which are respectively located at both ends of the internal threaded tube 19 and screwed to the internal threaded tube 19. The telescopic stud 110 is provided with a connecting seat 1101, and the connecting seats 1101 of the two telescopic studs 110 are respectively hinged to the first U-shaped plate 12 clamped and fixed to the adjacent main transformer housing 300 by a hinge shaft 1102.

[0036] A portion of the multiple cylinder bases 11 are symmetrically arranged on both sides of the riser 303 of the transformer housing 300. The arc plate 112 is hung on the outside of the riser 303. The two ends of the arc plate 112 are respectively fixed to the cylinder bases 11 symmetrically arranged on both sides of the riser 303 through the connecting plate 113. The arc plate 112 can provide a certain support for the cylinder bases 11 and prevent the cylinder bases 11 from sliding down the inclined surface of the top cover 301.

[0037] Pressure sensor 17 is fixed to piston rod 141 of lifting cylinder 14, and support 15 is connected to the measuring end of pressure sensor 17. Support plate 16 supports low-pressure connection box 400. Support plate 16 is rotatably mounted on support 15. More specifically, the upper surface of support 15 is provided with an arc groove 151, and the bottom of support plate 16 is provided with a convex arc surface corresponding to the arc groove 151. Support plate 16 fits against the inner wall of arc groove 151 through the convex arc surface. Support plate 16 can deflect relative to support 15 within a certain angle, thereby ensuring that support plate 16 is tightly fitted against the bottom surface of low-pressure connection box 400.

[0038] The support 15 is provided with a limiting part for restricting the separation of the support plate 16 from the support 15. More specifically, the limiting part is a column 152 provided on the support 15. The upper end of the column 152 is provided with a limiting boss 153. The support plate 16 is provided with a relief groove 161 for avoiding the column 152 and a groove 162 for avoiding the limiting boss 153. The bottom surfaces of the limiting boss 153 and the groove 162 are spaced apart.

[0039] The displacement sensor is used to monitor the displacement value of the piston rod 141 of the lifting cylinder 14. The displacement sensor can be a pull wire sensor 18, which is fixed on the lifting cylinder 14. The pull rope 181 of the pull wire sensor 18 is fixedly connected to the pressure sensor 17.

[0040] The electronic level 120 is fixed on the low-pressure connection box 400 and is used to measure the levelness of the low-pressure connection box 400. The hydraulic pump station is connected to the lifting cylinder 14 through hydraulic system components such as electromagnetic proportional valve, booster, hydraulic sensor, solenoid valve and oil pipe. The control equipment is electrically connected to the hydraulic pump station, pressure sensor 17, displacement sensor and electronic level 120. The control equipment can be a PLC control equipment.

[0041] The implementation principle of the three-phase combined transformer low-voltage connection box lifting monitoring device in this embodiment is as follows: When it is necessary to lift the low-voltage connection box 400, the low-voltage connection box 400 is disassembled from the lifting seat 303 of the transformer box 300. Then, the piston rods 141 of multiple lifting cylinders 14 are simultaneously controlled to extend by the control equipment, so that the support plates 16 of multiple hydraulic lifting components 10 are raised synchronously and contact the bottom surface of the low-voltage connection box 400. The load borne by the support plate 16 is measured by the pressure sensor 17. When the measured values ​​of the pressure sensors 17 of multiple hydraulic lifting components 10 reach the set values, the piston rods 141 of each lifting cylinder 14 are controlled to remain stationary. Next, the piston rod 141 of the lifting cylinder 14 is raised and lowered by the control equipment to adjust the height of the support plate 16 of each hydraulic lifting assembly 10. Based on the measurement signal fed back to the control equipment by the electronic level 120, the low-pressure connection box 400 is adjusted to a horizontal state. After the low-pressure connection box 400 is adjusted to a horizontal state, the piston rod 141 of each lifting cylinder 14 is controlled to remain stationary. Then, the piston rod 141 of the lifting cylinder 14 is controlled to rise by the control equipment to lift the low-pressure connection box 400. During the lifting process, the lifting height is precisely controlled by the displacement sensor to keep the lifting cylinders 14 of multiple hydraulic lifting assemblies 10 rising synchronously and lifting the low-pressure connection box 400 to the predetermined height.

[0042] Example 2 The difference between the three-phase combined transformer low-voltage connection box lifting monitoring device in this embodiment and Embodiment 1 is that it also includes a protective mechanism.

[0043] Reference Figures 6 to 12 The protective mechanism is symmetrically arranged on both sides of the low-pressure connection box 400. The protective mechanism includes a bottom support 20, a base 30, a horizontal plate 40, a lateral movement component 50, a diagonal brace 60, a swing component 70, a transmission rod 80, a push block 90, a first elastic element, and a locking component 100.

[0044] The base support 20 includes a base support frame 21 and a second clamping member. The base support frame 21 is supported on the ground of the main transformer compartment. The second clamping member is connected to the base support frame 21 and clamps and fixes to the reinforcing rib 302 of the main transformer housing 300. More specifically, the second clamping member includes a second U-shaped plate 22 and a second locking bolt 23. The second U-shaped plate 22 is fixedly connected to the base support frame 21. One side wall of the second U-shaped plate 22 abuts against the reinforcing rib 302 of the main transformer housing 300. The second U-shaped plate 22 is provided with a second locking screw hole. The second locking bolt 23 is screwed to the second U-shaped plate 22 through the second locking screw hole. The end of the second locking bolt 23 abuts against the reinforcing rib 302 of the main transformer housing 300.

[0045] The base 30 is fixed to the bottom support frame 21 of the bottom support member 20. The bottom of the horizontal plate 40 is provided with a slide rail 41. The horizontal plate 40 is slidably mounted on the slider of the base 30 via the slide rail 41. The transverse moving component 50 is mounted on the base 30 and is used to drive the horizontal plate 40 to move below the low-pressure connecting box 400 after the hydraulic lifting component 10 lifts the low-pressure connecting box 400. If the lifting cylinder 14 fails after the low-pressure connecting box 400 is lifted, causing the low-pressure connecting box 400 to fall, the horizontal plate 40 can support the falling low-pressure connecting box 400, thereby playing a certain protective role. The diagonal brace 60 is rotatably mounted on the base 30. The swing component 70 is mounted on the base 30 and is used to drive the diagonal brace 60 to rotate and support it below the horizontal plate 40 after the transverse moving component 50 drives the horizontal plate 40 to move below the low-pressure connecting box 400.

[0046] A guide post 31 is provided on the base 30, and a sliding plate 81 is provided on the transmission rod 80. The transmission rod 80 is vertically slidably sleeved on the guide post 31 of the base 30 via the sliding plate 81. The guide post 31 is provided with an upper stop block 32 and a lower stop block 33, and the sliding plate 81 is located between the upper stop block 32 and the lower stop block 33. The first elastic element is a first spring 200, which is sleeved on the outside of the guide post 31. The two ends of the first spring 200 abut against the sliding plate 81 and the upper stop block 32, respectively. The first elastic element is used to push the transmission rod 80 downward.

[0047] The push block 90 is detachably fixed to the reinforcing rib plate 401 of the low-pressure connection box 400 via a third clamping member. More specifically, the third clamping member includes a third U-shaped plate 91 and a third locking bolt 92. The third U-shaped plate 91 is fixedly connected to the push block 90. ​​One side wall of the third U-shaped plate 91 abuts against the reinforcing rib plate 401 of the low-pressure connection box 400. The third U-shaped plate 91 is provided with a third locking screw hole. The third locking bolt 92 is screwed to the third U-shaped plate 91 through the third locking screw hole. The end of the third locking bolt 92 abuts against the reinforcing rib plate 401 of the low-pressure connection box 400.

[0048] The transmission rod 80 has a protrusion 83 on its side. The push block 90 can push the protrusion 83. When the push block 90 rises with the low-pressure connection box 400, it can push the transmission rod 80 upward through the protrusion 83. The transmission rod 80 is connected to the transverse component 50 and the swing component 70 respectively. When the transmission rod 80 slides vertically, it can drive the horizontal plate 40 to move through the transverse component 50 and drive the diagonal brace 60 to rotate through the swing component 70.

[0049] In an optional embodiment, the specific structure of the transverse component 50 and its specific connection relationship with the transmission rod 80 are as follows: The transverse component 50 includes a first main gear 51 and a first auxiliary gear 52, which are rotatably mounted on the base 30 and mesh with each other. The transmission rod 80 is provided with a first rack 82 that meshes with the first main gear 51, and the transverse plate 40 is provided with a second rack 42 that meshes with the first auxiliary gear 52.

[0050] In an optional embodiment, the specific structure of the swing assembly 70 and its specific connection relationship with the transmission rod 80 are as follows: The swing assembly 70 includes a second main gear 71 and a second auxiliary gear 72, which are rotatably mounted on the base 30 and mesh with each other. The transmission rod 80 is provided with a gear row 84 that meshes with the second main gear 71. A worm gear 73 is coaxially mounted on the second auxiliary gear 72. The diagonal brace 60 is rotatably mounted on the base 30 via a pivot 61, and a worm wheel 62 that meshes with the worm gear 73 is mounted on the pivot 61.

[0051] The locking assembly 100 includes a wedge block 101 and a second elastic element. A pin seat 85 is provided on the transmission rod 80, and a locking pin 86 is provided on the pin seat 85. The locking pin 86 has an annular groove 861. The wedge block 101 is slidably disposed on the base 30. More specifically, the base 30 has a pin hole 34 and a guide groove 35 communicating with the pin hole 34. The locking pin 86 can be inserted into the pin hole 34, and the wedge block 101 is slidably disposed within the guide groove 35. A rod body 103 is provided on the wedge block 101, and the rod body 103 slidably passes through the base 30. A handle 104 is provided at the end of the rod body 103 away from the wedge block 101.

[0052] The second elastic element is a second spring 102, which is sleeved on the outside of the rod 103. The two ends of the second spring 102 abut against the end faces of the wedge block 101 and the guide groove 35, respectively. The second elastic element acts on the wedge block 101 and, when the transmission rod 80 moves upward until the annular groove 861 of the locking pin 86 aligns with the wedge block 101, pushes the wedge block 101 into engagement with the annular groove 861. When the low-pressure connection box 400 is lifted to a predetermined position, the transmission rod 80 moves upward until the locking pin 86 is inserted into the pin hole 34, and the annular groove 861 of the locking pin 86 aligns with the wedge block 101. At this time, under the elastic force of the second elastic element, the wedge block 101 is pushed into engagement with the annular groove 861, locking the transmission rod 80. When the gasket is replaced and the low-pressure connection box 400 needs to be lowered by the hydraulic lifting assembly 10, pull the handle 104 to disengage the wedge block 101 from the annular groove 861. Then, under the elastic force of the first spring 200, push the transmission rod 80 to move down. Under the action of the transverse component 50 and the swing component 70, the transverse plate 40 and the diagonal brace 60 are respectively reset to avoid interference with the descent of the low-pressure connection box 400.

[0053] Example 3 Based on Embodiment 2, the present invention also provides a control method using the aforementioned three-phase combined transformer low-voltage connection box lifting monitoring device for lifting the low-voltage connection box of the main transformer. The control method includes the following steps: S1. Disassemble the low-voltage connection box 400 from the riser 303 of the transformer box 300; S2. By controlling the piston rods 141 of multiple lifting cylinders 14 to extend simultaneously through the control equipment, the pallets 16 of multiple hydraulic lifting components 10 are raised synchronously. S3. The load borne by the pallet 16 is measured by the pressure sensor 17. When the measured values ​​of the pressure sensors 17 of the multiple hydraulic lifting components 10 reach the set values ​​respectively, the piston rod 141 of each lifting cylinder 14 is controlled to remain stationary. S3. Control the piston rod 141 of the lifting cylinder 14 to lift and lower through the control equipment, adjust the height of the support plate 16 of each hydraulic lifting component 10, and adjust the low pressure connection box 400 to a horizontal state according to the measurement signal fed back to the control equipment by the electronic level 120. After adjusting to a horizontal state, control the piston rod 141 of each lifting cylinder 14 to keep it stationary. S4. The displacement sensor measures the length and resets it to the reference value. The piston rod 141 of the lifting cylinder 14 is controlled by the control equipment to rise and lift the low-pressure connection box 400. During the lifting process, the lifting height is precisely controlled by the displacement sensor so that the lifting cylinders 14 of the multiple hydraulic lifting components 10 keep lifting synchronously and lift the low-pressure connection box 400 to the predetermined height. During the lifting process, the transmission rod 80 moves upward with the push block 90, and the transmission rod 80 drives the horizontal plate 40 to gradually slide and extend below the low-pressure connection box 40 through the transverse moving assembly 50; at the same time, the transmission rod 80 drives the diagonal brace 60 to gradually rotate through the swing assembly 70 and support it on the lower side of the extended end of the horizontal plate 40.

[0054] Specifically, when the low-voltage connection box 400 and the transformer box 300 are disassembled and the lifting seat 303 is not yet lifted, the horizontal plate 40 is located on both sides of the low-voltage connection box 400, and the diagonal brace 60 is located below the low-voltage connection box 400.

[0055] When the low-pressure connection box 400 is lifted by the hydraulic lifting assembly 10, the jacking block 90 rises with the low-pressure connection box 400 and drives the transmission rod 80 to move upward through the jacking protrusion 83. When the transmission rod 80 moves upward, it drives the horizontal plate 40 to move below the low-pressure connection box 40 through the first rack 82, the first main gear 51, the first secondary gear 52 and the second rack 42, providing a certain degree of protection for the low-pressure connection box 400. At the same time, it drives the diagonal brace 60 to rotate to support it below the horizontal plate 40 through the gear row 84, the second main gear 71, the second secondary gear, the worm 73, the worm wheel 62 and the pivot 61, providing support and reinforcement for the horizontal plate 40.

[0056] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the invention. Modifications and variations made by those skilled in the art in accordance with the spirit of the invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A monitoring device for the lifting of the low-voltage connection box of a three-phase combined transformer, characterized in that: include: The hydraulic jacking assembly (10) includes a support, a jacking cylinder (14), a support (15), a tray (16), a pressure sensor (17), and a displacement sensor. The support is detachably fixed to the transformer box (300). The jacking cylinder (14) is mounted on the support. The pressure sensor (17) is fixed to the piston rod (141) of the jacking cylinder (14). The support (15) is connected to the measuring end of the pressure sensor (17). The tray (16) can be deflected on the support (15) and is used to support the low-voltage connection box (400). The displacement sensor is used to monitor the displacement value of the piston rod (141) of the jacking cylinder (14). Electronic level (120), the electronic level (120) is fixed on the low-voltage connection box (400); Hydraulic pump station, which is connected to lifting cylinder (14); The control device is electrically connected to the hydraulic pump station, pressure sensor (17), displacement sensor and electronic level (120).

2. The monitoring device for the lifting of the low-voltage connection box of a three-phase combined transformer according to claim 1, characterized in that, The upper surface of the support (15) is provided with an arc groove (151), and the bottom of the support plate (16) is provided with a convex arc surface with a shape corresponding to the arc groove (151). The support plate (16) fits against the inner wall of the arc groove (151) through the convex arc surface. The support (15) is provided with a limiting part for limiting the separation of the support plate (16) from the support (15).

3. The monitoring device for the lifting of the low-voltage connection box of a three-phase combined transformer according to claim 1, characterized in that, The support includes a cylinder base (11) and a first clamping member. The bottom surface of the cylinder base (11) abuts against the upper surface of the top cover (301) of the main transformer housing (300). The first clamping member includes a first U-shaped plate (12) and a first locking bolt (13). One side wall of the first U-shaped plate (12) abuts against the lower surface of the top cover (301) of the main transformer housing (300). The first U-shaped plate (12) is provided with a first locking screw hole. The first locking bolt (13) is screwed to the first U-shaped plate (12) through the first locking screw hole. The end of the first locking bolt (13) abuts against the cylinder base (11). The lifting cylinder (14) is fixed on the cylinder base (11).

4. The three-phase combined transformer low-voltage connection box lifting monitoring device according to claim 3, characterized in that, The support also includes an internally threaded tube (19) and telescopic studs (110). There are two telescopic studs (110), which are respectively located at both ends of the internally threaded tube (19) and are screwed to the internally threaded tube (19). The telescopic studs (110) are provided with connecting seats (1101). The connecting seats (1101) of the two telescopic studs (110) are respectively hinged to the first U-shaped plate (12) clamped and fixed on the adjacent main transformer box (300).

5. The monitoring device for the lifting of the low-voltage connection box of a three-phase combined transformer according to claim 3, characterized in that, The support also includes an arc plate (112), and the cylinder base (11) is symmetrically arranged on both sides of the riser seat (303) of the transformer box (300). The arc plate (112) is hung on the outside of the riser seat (303), and the two ends of the arc plate (112) are respectively fixedly connected to the cylinder base (11) symmetrically arranged on both sides of the riser seat (303).

6. The monitoring device for the lifting of the low-voltage connection box of a three-phase combined transformer according to claim 1, characterized in that, It also includes a protective mechanism, which includes a bottom support (20), a base (30), a horizontal plate (40), a transverse movement assembly (50), a diagonal brace (60), and a swing assembly (70). The base (30) is mounted on the bottom support (20), the horizontal plate (40) is slidably mounted on the base (30), the transverse movement assembly (50) is mounted on the base (30), and is used to drive the horizontal plate (40) to move below the low-pressure connection box (400) after the hydraulic lifting assembly (10) lifts the low-pressure connection box (400). The diagonal brace (60) is rotatably mounted on the base (30), and the swing assembly (70) is mounted on the base (30), and is used to drive the diagonal brace (60) to rotate to support below the horizontal plate (40) after the transverse movement assembly (50) drives the horizontal plate (40) to move below the low-pressure connection box (400).

7. The monitoring device for the lifting of the low-voltage connection box of a three-phase combined transformer according to claim 6, characterized in that, The protective mechanism also includes a transmission rod (80), a push block (90), and a first elastic element. The transmission rod (80) is slidably mounted on the base (30) in the vertical direction. The push block (90) is detachably fixed on the low-pressure connection box (400). When the push block (90) rises with the low-pressure connection box (400), it can push the transmission rod (80) to move upward. The first elastic element is used to push the transmission rod (80) to move downward. The transmission rod (80) is connected to the transverse component (50) and the swing component (70) respectively. When the transmission rod (80) slides in the vertical direction, it can drive the horizontal plate (40) to move through the transverse component (50) and drive the diagonal brace (60) to rotate through the swing component (70).

8. The monitoring device for the lifting of the low-voltage connection box of a three-phase combined transformer according to claim 7, characterized in that, The transverse assembly (50) includes a first main gear (51) and a first auxiliary gear (52). The first main gear (51) and the first auxiliary gear (52) are rotatably mounted on the base (30) and mesh with each other. The transmission rod (80) is provided with a first rack (82) that meshes with the first main gear (51). The transverse plate (40) is provided with a second rack (42) that meshes with the first auxiliary gear (52). The side of the transmission rod (80) is provided with a protrusion (83). The push block (90) can push the protrusion (83).

9. The monitoring device for the lifting of the low-voltage connection box of a three-phase combined transformer according to claim 7, characterized in that, The swing assembly (70) includes a second main gear (71) and a second auxiliary gear (72). The second main gear (71) and the second auxiliary gear (72) are rotatably mounted on the base (30) and mesh with each other. The transmission rod (80) is provided with a gear rack (84) that meshes with the second main gear (71). The second auxiliary gear (72) is coaxially provided with a worm gear (73). The diagonal brace (60) is rotatably mounted on the base (30) via a pivot (61). The pivot (61) is provided with a worm wheel (62) that meshes with the worm gear (73).

10. The three-phase combined transformer low-voltage connection box lifting monitoring device according to claim 7, characterized in that, The protective mechanism also includes a locking component (100), which includes a wedge block (101) and a second elastic element. A locking pin (86) is provided on the transmission rod (80), and an annular groove (861) is provided on the locking pin (86). The wedge block (101) is slidably disposed on the base (30). The second elastic element acts on the wedge block (101) and can push the wedge block (101) to engage with the annular groove (861) when the transmission rod (80) moves to the annular groove (861) of the locking pin (86) aligns with the wedge block (101).

11. A control method for the lifting monitoring device of the low-voltage connection box of a three-phase combined transformer as described in any one of claims 7 to 10, characterized in that, The control method for jacking up the low-voltage connection box of the main transformer includes the following steps: S1. Disassemble the low-voltage connection box (400) and the riser (303) of the transformer box (300); S2. By controlling the piston rods (141) of multiple lifting cylinders (14) to extend simultaneously through the control equipment, the pallets (16) of multiple hydraulic lifting components (10) are raised synchronously. S3. The load borne by the pallet (16) is measured by the pressure sensor (17). When the measured values ​​of the pressure sensors (17) of the multiple hydraulic lifting components (10) reach the set values ​​respectively, the piston rod (141) of each lifting cylinder (14) is controlled to remain stationary. S3. Control the piston rod (141) of the lifting cylinder (14) to lift and lower by controlling the control equipment, adjust the height of the support plate (16) of each hydraulic lifting component (10), and adjust the low pressure connection box (400) to a horizontal state according to the measurement signal fed back to the control equipment by the electronic level (120). After adjusting to a horizontal state, control the piston rod (141) of each lifting cylinder (14) to remain stationary. S4. The displacement sensor measures the length and resets it to the reference value. The piston rod (141) of the lifting cylinder (14) is controlled by the control equipment to rise and lift the low-pressure connection box (400). During the lifting process, the lifting height is precisely controlled by the displacement sensor so that the lifting cylinders (14) of multiple hydraulic lifting components (10) are lifted synchronously and the low-pressure connection box (400) is lifted to the predetermined height. During the lifting process to the predetermined height, the transmission rod (80) moves upward with the push block (90), and the transmission rod (80) drives the horizontal plate (40) to gradually slide and extend below the low-pressure connection box (400) through the transverse component (50); at the same time, the transmission rod (80) drives the diagonal brace (60) to gradually rotate and support it on the lower side of the extended end of the horizontal plate (40) through the swing component (70).

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