Split type lifting device for overhauling gas chamber of gas insulated switchgear

Abstract

The invention relates to the technical field of power construction, and particularly discloses a split lifting device for overhauling a gas chamber of a gas insulated switchgear, the split lifting device comprises a distribution box and two supports, each support comprises a supporting frame, one side of each supporting frame is provided with a supporting block matched with the gas chamber, and the other side of each supporting frame is provided with two stand columns; vertical electric push rods are connected to the side walls of the stand columns, universal wheels are connected to piston rods of the vertical electric push rods, a transverse electric push rod is connected to the bottom of the stand column of one support, a pull plate is arranged at the bottom of the stand column of the other support, and a piston rod of the transverse electric push rod is detachably connected with the pull plate. The distribution box is provided with a control button used for controlling the transverse electric push rod and the vertical electric push rod. According to the invention, safe, accurate and efficient dismounting and mounting of the target air chamber in the equipment in situ are realized, the unplanned power failure risk of a power grid and the safety risk of field operation are reduced, the problem of low flange butt joint precision is solved, and the maintenance quality and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of power construction technology, specifically to a split-type lifting device for the maintenance of the gas chamber of gas-insulated switchgear. Background Technology

[0002] Gas-insulated switchgear (GIS) is widely used in power systems due to its small footprint and high reliability. Its gas-insulated structure typically consists of multiple flanged pipes assembled together. Traditional methods for maintaining indoor GIS equipment, especially the disassembly and relocation of bottom-mounted gas-insulated units, rely primarily on fixed roof supports or spider cranes. However, these methods present significant technical challenges and safety hazards. High risks to the power grid: Due to the compact structure of GIS equipment, the safe distance between each chamber is limited. When it is necessary to dismantle the bottom chamber, there are often other energized or protected chambers above it. To ensure the safe distance, it is often necessary to de-energize and dismantle the non-target chambers above, resulting in a large number of accompanying equipment shutdowns and long operation time, which significantly increases the risk of unplanned power outages and the pressure on safe operation of the power grid.

[0003] High operational risks: Indoor environments often result in the hoisting points not perfectly matching the equipment positions, requiring multiple chain hoists to be used in coordination for aerial relocation and adjustment. This process is difficult to precisely control the equipment's center of gravity, is complex, and greatly increases the risk of equipment swaying, tilting, or even tipping over, posing a high risk of accidental contact with adjacent live equipment or damage to the equipment itself.

[0004] Low assembly precision: When assembling the gas chamber flange sealing surfaces under lifting conditions, the equipment is in a suspended or unstable state, making it difficult to achieve stable fixation and precise spatial positioning. Assembly mainly relies on manual labor, which is inefficient and inaccurate. Misalignment and uneven stress can easily lead to poor sealing, causing serious safety hazards such as SF6 gas leakage or interface discharge during subsequent operation.

[0005] In order to overcome the inherent defects of the above-mentioned hoisting operation methods, there is an urgent need for a special maintenance device that can be used in confined indoor spaces, can be precisely controlled, and can stably support and transport GIS gas chambers, so as to reduce power grid and operational risks and improve maintenance quality and efficiency. Summary of the Invention

[0006] This invention addresses the aforementioned shortcomings of existing technologies by providing a split-type lifting device for the maintenance of gas-insulated switchgear (GIS) chambers. Through a split-type support, electric push rod, and specialized clamping and limiting mechanisms, it forms a comprehensive GIS chamber maintenance device integrating stable support, precise lifting, posture adjustment, safety limiting, and convenient movement. It completely eliminates reliance on high-altitude lifting points, enabling safe, precise, and efficient disassembly and installation of target chambers (especially bottom chambers) in situ. This device significantly reduces the risk of unplanned power outages and on-site operational safety risks, solves the problem of low flange connection accuracy, and improves maintenance quality and efficiency. To achieve the above objectives, the present invention provides the following technical solution: A split-type lifting device for inspecting the gas chamber of a gas-insulated switchgear includes a distribution box and two supports. Each support includes a support frame, one side of which has a support block that mates with the gas chamber. The support block is made of rubber, and the side wall of the support block that contacts the gas chamber is a concave arc surface with anti-slip texture. The other side of the support frame has two columns connected at their bottoms by a crossbar. A vertical electric push rod and a support plate supporting the vertical electric push rod are connected to the side wall of each column. A caster wheel is connected to the piston rod of the vertical electric push rod. A horizontal electric push rod is connected to the bottom of one support column, and a pull plate is provided at the bottom of the other support column. The piston rod of the horizontal electric push rod is detachably connected to the pull plate. A handle is connected between the two columns. The distribution box is fixed to the support plate of one of the supports and has control buttons for controlling the horizontal and vertical electric push rods.

[0007] Preferably, a corner plate for supporting blocks is connected to one side of the support frame, a support rod for supporting corner plates is connected to the lower end of the support frame, a positioning post is connected to the side wall of the corner plate, the support block is fitted onto the positioning post, and a stiffening plate is connected inside the corner plate. Preferably, the support frame is provided with support nuts at both ends, a first threaded rod is connected inside the support nut, a positioning block is provided at the end of the first threaded rod, and a first rotating block for rotation is sleeved on the outside of the first threaded rod.

[0008] Preferably, the upper ends of the two columns are connected by a reinforcing rod. Preferably, a limiting rod is connected between the columns of the two supports, and the limiting rod limits the upper end of the air chamber.

[0009] Preferably, the side wall of the column is provided with a limiting hole and a second threaded rod, the limiting hole and the second threaded rod are parallel, both ends of the limiting rod pass through the limiting hole, the upper end of the second threaded rod is connected to a second rotating block, the outer side of the second threaded rod is fitted with a threaded lifting block, the lifting block is close to the column, both ends of the lifting block are connected to pressure rods, the pressure rods are close to the outer side of the limiting hole and located at the upper end of the limiting rod, one end of the limiting rod is provided with a limiting block, and the other end of the limiting rod is provided with an external thread and fitted with a locking nut.

[0010] Preferably, the outer side of the limiting rod is covered with a rubber sleeve.

[0011] Preferably, the pull plate is provided with a pull hole, and the end of the piston rod of the transverse electric push rod is connected with a threaded sleeve. The threaded sleeve cooperates with the pull hole, and a detachable tension nut with a diameter larger than the pull hole is fitted on the threaded sleeve.

[0012] Preferably, the bottom of the support rod is connected to a movable wheel.

[0013] Preferably, the distribution box is equipped with a battery that supplies power to the horizontal electric push rod and the vertical electric push rod, and the control buttons include a horizontal electric push rod control button, a vertical electric push rod control button for a single bracket, a control button for all vertical electric push rods, and two vertical electric push rod control buttons at the same end of two brackets.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses two independent supports to operate from both sides of the air chamber, eliminating the need for hoisting from directly above the equipment. This completely avoids the need to dismantle the upper air chamber, greatly reducing the scope of equipment shutdown and operation time, and fundamentally reducing the safety risks to the power grid. By connecting and driving the two supports with a horizontal electric push rod to move towards or away from each other, the automatic and stable clamping and loosening of the air chamber is achieved, replacing manual pry bar operation. The clamping force is uniform and controllable, preventing the equipment from being deformed and damaged due to excessive local stress.

[0015] 2. The support block of the present invention is made of rubber, which plays a buffering and protective role when in contact with the outer wall of the air chamber, preventing the metal from scratching the equipment shell through hard contact. The side wall of the support block is designed as a concave arc surface with anti-slip texture, which can better fit the cylindrical outer wall of the air chamber, increase friction, and effectively prevent the air chamber from rolling or slipping during support and transportation, thereby improving clamping stability and safety.

[0016] 3. The height of any single support can be independently adjusted via the "Individual Support Vertical Electric Push Rod Control Button," facilitating precise leveling of the two support surfaces during initial positioning or on uneven ground, ensuring the air chamber is horizontal. The "All Vertical Electric Push Rod Control Buttons" allow simultaneous control of all four push rods, enabling smooth and vertical lifting of the air chamber as a whole, facilitating the disassembly and installation of flange connection bolts. The "Same-End Vertical Electric Push Rod Control Buttons" (controlling two push rods in relative positions) allow for fine adjustment of the height at one end of the air chamber, enabling minute pitch adjustments around the other end. This function is crucial during flange face-to-face connection, achieving precise alignment of the sealing surface, solving the problem of difficult fine-tuning in traditional hoisting methods, greatly improving connection accuracy and sealing reliability, and eliminating the risk of leakage and discharge due to poor connection.

[0017] 4. By rotating the first rotating block to drive the first threaded rod, the positioning block is pressed tightly against the side wall of the air chamber flange, effectively preventing the air chamber from sliding along its axial direction (length direction), enhancing support stability, and adapting to flanges of different sizes. The limiting rod, spanning above the two supports and located above the air chamber, works in conjunction with the liftable lifting block (driven by the second threaded rod) to form a constraint on the upper part of the air chamber. Combined with the lower support block, this achieves reliable vertical limiting of the air chamber, preventing it from jumping upwards during movement or lifting, further ensuring safety during transport. The limiting rod is covered with a rubber sleeve to prevent direct contact between metal rods and potential damage to the air chamber or other components.

[0018] 5. By adjusting the lifting block and pressure rod, an active, adjustable and reliable constraint force is provided to achieve dynamic and stable limiting. This effectively counteracts the inertial force or vibration that may be generated in the air chamber due to device movement, uneven ground, or fine-tuning operations, ensuring that the air chamber remains stably limited during dynamic operation. This greatly improves the safety of transportation and operation. It can accurately adapt to GIS air chambers with different outer diameters. Regardless of the air chamber diameter, the limiting rod can be adjusted to press precisely at the optimal position on the top of the air chamber, making it extremely versatile.

[0019] 6. The present invention is equipped with casters and omnidirectional wheels, which enable a single support to stand upright, making it easy to move and transport, and increasing the convenience of docking. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure when the present invention is in use; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the limit rod structure; Figure 5 This is a schematic diagram of the first support structure; Figure 6 This is a schematic diagram of the second support structure; Figure 7 This is a schematic diagram of the upper structure of the column; Figure 8 This is a schematic diagram of the corner plate. In the diagram: 1-Distribution box; 101-Control button; 2-Bracket; 201-Moving wheel; 202-Support rod; 203-Pull hole; 204-Pull plate; 205-Universal wheel; 206-Support plate; 207-Vertical electric push rod; 208-Handle; 209-Column; 210-Support block; 211-Angle plate; 212-Positioning block; 213-First rotating block; 214-First threaded rod; 215-Support frame; 206 - Reinforcing rod; 217 - Positioning post; 218 - Rib plate; 219 - Second threaded rod; 220 - Second rotating block; 221 - Lifting block; 222 - Pressure rod; 223 - Guide rod; 224 - Limiting hole; 225 - Support nut; 3 - Lateral electric push rod; 301 - Threaded sleeve; 302 - Tensioning nut; 4 - Limiting rod; 401 - Limiting block; 402 - Rubber sleeve; 403 - External thread; 404 - Locking nut. Detailed Implementation

[0021] 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.

[0022] like Figure 2 , Figure 3 The aforementioned split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear includes a distribution box 1 and two supports 2.

[0023] The two supports 2 have the same structure, such as Figure 5 , Figure 6As shown, the bracket 2 includes a support frame 215. One side of the support frame 215 has a support block 210 that cooperates with the air chamber. The support block 210 is made of rubber, and the side wall of the support block 210 that contacts the air chamber is a concave arc surface with anti-slip texture. The other side of the support frame 215 has two uprights 209, whose bottoms are connected by a crossbar. A vertical electric push rod 207 and a support plate 206 supporting the vertical electric push rod 207 are connected to the side wall of the uprights 209. A caster wheel 205 is connected to the piston rod of the vertical electric push rod 207. A horizontal electric push rod 3 is connected to the bottom of each upright 209 of one bracket 2. A pull plate 204 is provided at the bottom of the upright 209 of the other bracket 2. The piston rod of the horizontal electric push rod 3 is detachably connected to the pull plate 204.

[0024] The distribution box 1 is fixed on the support plate 206 of one of the brackets 2. The distribution box 1 is equipped with a control button 101 for controlling the horizontal electric push rod 3 and the vertical electric push rod 207. The distribution box 1 is equipped with a battery that supplies power to the horizontal electric push rod 3 and the vertical electric push rod 207.

[0025] The control buttons 101 include: a horizontal electric actuator 3 control button 101 for controlling the extension and retraction of two horizontal electric actuators 3; a vertical electric actuator 207 control button 101 for a single bracket 2 for extending and retracting two vertical electric actuators 207 on a bracket 2, which can adjust the height of a single bracket 2 and ensure the connection between two brackets 2; a full vertical electric actuator 207 control button 101 for controlling the extension and retraction of all vertical electric actuators 207, synchronously controlling the raising and lowering of the air chamber; and two vertical electric actuators 207 control buttons 101 at the same end of the two brackets 2, which can control the extension and retraction of two vertical electric actuators 207 located in opposite positions on the two brackets 2, and can adjust one end of the whole to achieve angle adjustment.

[0026] In use, the two supports 2 are located on both sides of the air chamber. The piston rod of the transverse electric push rod 3 is connected to the pull plate 204. The two supports 2 are pulled closer by the transverse electric push rod 3 so that the support block 210 supports the air chamber. After the bolts on the flange are removed, a handle 208 is connected between the two columns 209. The device can be pushed by the handle 208 to move the air chamber away.

[0027] To improve the stability of the support block 210, such as Figure 8 As shown, a corner plate 211 of a support block 210 is connected to one side of the support frame 215, a support rod 202 of the support corner plate 211 is connected to the lower end of the support frame, a positioning post 217 is connected to the side wall of the corner plate 211, the support block 210 is fitted onto the positioning post 217, and a stiffening plate 218 is connected inside the corner plate 211. To ensure the stability of the supporting and transporting air chamber, the support frame 215 is provided with support nuts 225 at both ends. A first threaded rod 214 is connected inside the support nut 225. A positioning block 212 is provided at the end of the first threaded rod 214. A first rotating block 213 for rotation is sleeved on the outside of the first threaded rod 214. The position of the positioning block 212 can be adjusted by rotating the first threaded rod 214 through the first rotating block 213. The positioning block 212 is pressed against the side wall of the flange to prevent the air chamber from sliding between the device and the device, ensuring safety. At the same time, the adjustable positioning block 212 can increase the adaptability of the device.

[0028] The upper ends of the two columns 209 are connected by a reinforcing rod 216 to improve the structural strength and stability of the support 2. A limiting rod 4 is connected between the columns 209 of the two supports 2. The limiting rod 4 limits the upper end of the air chamber to prevent the air chamber from sliding upward.

[0029] like Figure 7 As shown, the side wall of the column 209 is provided with a limiting hole 224 and a second threaded rod 219. The limiting hole 224 and the second threaded rod 219 are parallel. Both ends of the limiting rod 4 pass through the limiting hole 224. The upper end of the second threaded rod 219 is connected to a second rotating block 220. A threaded lifting block 221 is fitted on the outside of the second threaded rod 219. The lifting block 221 is in close contact with the column 209. Both ends of the lifting block 221 are connected to pressure rods 222. The pressure rods 222 are in close contact with the outside of the limiting hole 224 and are located at the upper end of the limiting rod 4. Figure 4 As shown, one end of the limiting rod 4 is provided with a limiting block 401, the other end of the limiting rod 4 is provided with an external thread 403 and a locking nut 404 is fitted on it, and a rubber sleeve 402 is fitted on the outside of the limiting rod 4.

[0030] Insert the limiting rod 4 through the two opposing columns 209 so that the limiting rod 4 is located at the upper end of the air chamber. Adjust the two limiting rods 4 so that the pressure rod 222 presses against the upper end of the limiting rod 4. Then install the locking nut 404 to tighten and fix the limiting rod 4.

[0031] The pull plate 204 is provided with a pull hole 203. The end of the piston rod of the transverse electric push rod 3 is connected to a threaded sleeve 301. The threaded sleeve 301 passes through the pull hole 203. Then, a tension nut 302 is installed on the threaded sleeve 301. The diameter of the tension nut 302 is larger than that of the pull hole 203. After installation, the transverse electric push rod 3 can pull the two brackets 2 closer to each other, supporting and clamping the air chamber.

[0032] For greater ease of use, casters 201 are attached to the bottom of the support rod 202, allowing the individual support 2 to stand and move, facilitating assembly and relocation.

[0033] like Figure 1 As shown, the usage process is as follows: Positioning and initial assembly of bracket 2: Push the two independent supports 2 to the appropriate positions on both sides of the air chamber, roughly aligning them.

[0034] Insert the threaded sleeve 301 at the piston rod end of the transverse electric push rod 3 into the pull hole 203 of the pull plate 204, and install the tension nut 302 on the threaded sleeve 301 to achieve the initial mechanical connection between the two brackets 2.

[0035] Clamping air chamber: Operate the "Horizontal Electric Push Rod 3 Control Button 101" on the distribution box 1 to make the two horizontal electric push rods 3 retract synchronously, pulling the two brackets 2 closer to the middle.

[0036] Observe whether the arc surfaces of the two support blocks 210 gradually conform to the outer wall of the air chamber. Continue to contract until the two support blocks 210 firmly support the air chamber and maintain a certain preload. At this point, the weight of the air chamber is borne by the two supports 2.

[0037] Install lateral and upper limit switches: Rotate the first rotating block 213 at both ends of each support frame 215 to drive the first threaded rod 214, so that the positioning block 212 at the end of the threaded rod moves forward until it tightly abuts against the side of the air chamber flange to prevent the air chamber from moving axially.

[0038] Two limiting rods 4 are respectively inserted from above the air chamber and passed through the limiting holes 224 at corresponding positions on the two brackets 2.

[0039] Rotate the second rotating block 220 at the upper end of the second threaded rod 219 to drive the lifting block 221 to descend, so that the pressure rod 222 presses against the upper end of the limiting rod 4, thereby pressing the limiting rod 4 tightly against the upper part of the air chamber shell.

[0040] At the end of the limiting rod 4 that protrudes from the outside of the column 209, install and tighten the locking nut 404. Both the limiting block 401 and the locking nut 404 are located on one side of the pressure rod 222, ensuring that the limiting rod 4 is tightened and fixed, thus completing the upper limiting.

[0041] Disassembly and lifting: Use tools to remove all connecting bolts on the gas chamber flange.

[0042] Operate the "Up" button on the "Control Button 101 for All Vertical Electric Push Rods 207" to make the four vertical electric push rods 207 extend slowly and synchronously, raising the air chamber to a sufficient height for removal.

[0043] Transportation and installation: The entire device can be easily moved to the designated position by pushing the handle 208 installed between the columns 209.

[0044] When installing the air chamber, the device moves the air chamber to the installation position, and the height and angle of the air chamber are adjusted by the electric push rod to ensure that the flanges between the air chambers are precisely aligned. Then, the flanges are connected and fixed with bolts.

[0045] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear, characterized in that: The system includes a distribution box and two brackets. Each bracket includes a support frame. One side of the support frame has a support block that mates with an air chamber. The support block is made of rubber, and the side wall of the support block that contacts the air chamber is a concave arc surface with anti-slip texture. The other side of the support frame has two columns connected at their bottoms by a crossbar. A vertical electric push rod and a support plate supporting the vertical electric push rod are connected to the side wall of each column. A caster wheel is connected to the piston rod of the vertical electric push rod. A horizontal electric push rod is connected to the bottom of one bracket's column, and a pull plate is provided at the bottom of the other bracket's column. The piston rod of the horizontal electric push rod is detachably connected to the pull plate. A handle is connected between the two columns. The distribution box is fixed to the support plate of one of the brackets and has control buttons for controlling the horizontal and vertical electric push rods.

2. The split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear as described in claim 1, characterized in that: One side of the support frame is connected to a corner plate of a support block, the lower end of the support frame is connected to a support rod of the support corner plate, a positioning post is connected to the side wall of the corner plate, the support block is fitted onto the positioning post, and a stiffening plate is connected inside the corner plate.

3. The split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear as described in claim 1, characterized in that: The support frame has support nuts at both ends, and a first threaded rod is connected inside the support nut. The end of the first threaded rod is provided with a positioning block, and a first rotating block for rotation is sleeved on the outside of the first threaded rod.

4. A split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear as described in claim 1, characterized in that: The upper ends of the two columns are connected by a reinforcing rod.

5. A split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear as described in claim 1, characterized in that: A limit rod is connected between the two support columns, which limits the upper end of the air chamber.

6. A split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear as described in claim 5, characterized in that: The column has a limiting hole and a second threaded rod on its side wall. The limiting hole and the second threaded rod are parallel. Both ends of the limiting rod pass through the limiting hole. The upper end of the second threaded rod is connected to a second rotating block. A threaded lifting block is fitted on the outside of the second threaded rod. The lifting block is in close contact with the column. Both ends of the lifting block are connected to pressure rods. The pressure rods are in close contact with the outside of the limiting hole and are located at the upper end of the limiting rod. One end of the limiting rod is provided with a limiting block. The other end of the limiting rod is provided with an external thread and fitted with a locking nut.

7. A split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear as described in claim 5, characterized in that: The outer side of the limiting rod is covered with a rubber sleeve.

8. A split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear as described in claim 1, characterized in that: The pull plate is provided with a pull hole, and the end of the piston rod of the transverse electric push rod is connected with a threaded sleeve. The threaded sleeve is engaged with the pull hole, and a detachable tension nut with a diameter larger than the pull hole is fitted on the threaded sleeve.

9. A split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear as described in claim 2, characterized in that: The bottom of the support rod is connected to a caster wheel.

10. A split-type lifting device for overhauling the gas chamber of a gas-insulated switchgear as described in claim 2, characterized in that: The distribution box is equipped with batteries that supply power to the horizontal and vertical electric push rods. The control buttons include a horizontal electric push rod control button, a vertical electric push rod control button for a single bracket, a control button for all vertical electric push rods, and two vertical electric push rod control buttons at the same end of two brackets.

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