A large transformer low-voltage bushing dismounting, transporting equipment

Abstract

The application discloses a large transformer low-voltage bushing dismounting, transferring and transporting equipment, which comprises a frame, a screw rod component and the like.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more specifically to a device for disassembling, assembling, and transferring low-voltage bushings of large transformers. Background Technology

[0002] The low-voltage bushing of a transformer is an insulating bushing that leads the low-voltage leads from inside the transformer to the outside of the tank. It not only insulates the leads from ground but also serves to fix the leads in place. The transformer bushing is one of the current-carrying components of the transformer, carrying the load current continuously during operation and the short-circuit current when a short circuit occurs outside the transformer. Therefore, the low-voltage bushing is an important auxiliary component of the transformer.

[0003] Low-voltage bushings may leak oil during transformer operation due to a decrease in the sealing performance of the flange or the inside of the bushing. Therefore, regular inspections are necessary, and leaking low-voltage bushings should be replaced. Low-voltage bushings of large transformers are bulky and heavy. Existing hoisting methods generally use porcelain insulator skirts or lifting rings for side-pull force application, which carries a high risk of hoisting operations and can easily cause damage to the skirts. Summary of the Invention

[0004] The purpose of this invention is to provide a device for disassembling, assembling, and transferring low-voltage bushings of large transformers, in order to solve the technical problems in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A large transformer low-voltage bushing disassembly, assembly, and transfer device, comprising:

[0007] A frame is disposed around the low-pressure bushing and is fixedly connected to the flange of the low-pressure bushing.

[0008] A lead screw assembly is provided, which extends through the frame, and the low-pressure bushing can be lifted and transported via the lead screw assembly.

[0009] In some embodiments, the frame includes a square metal frame and two side metal frames. The square metal frames are trapezoidal and are respectively arranged on both sides of the low-pressure bushing. There are four side metal frames, which connect the upper and lower sides of the two square metal frames to form an integral frame. There are bolt holes at the bottom center of the square metal frames, which are fixed to the low-pressure bushing flange by bushing bearing bolts.

[0010] In some embodiments, the frame further includes: a pull plate A, a pull plate B, and a bolt tensioner, wherein the pull plate A and the pull plate B are fixed to the flange of the low-pressure bushing by pull plate fixing bolts; the bottom of the lower side metal frame has a perforated pull plate, which is connected to the pull plate A by the bolt tensioner.

[0011] In some embodiments, the bolt tensioner is locked at both ends by pins.

[0012] In some embodiments, the top of the side metal frame is provided with four eye bolts.

[0013] In some embodiments, the lead screw assembly includes a lead screw, a hexagonal metal block, a lead screw nut, and a swivel caster. There are four lead screws, which are arranged through the side metal frame. The bottom of the lead screw is fixedly connected to the rotating plate on the swivel caster. The lead screw nut is threaded onto the lead screw and is respectively set on the side metal frame. The hexagonal metal block is set on the top of the lead screw.

[0014] The beneficial effects of this invention compared to the prior art are:

[0015] This patent enables the low-voltage bushing of a transformer to move in both vertical and horizontal directions, and also allows the bushing to rotate along its axis, thereby improving the efficiency of disassembling and installing the low-voltage bushing of the transformer, reducing the labor intensity of the operation, and lowering the operational risks. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention.

[0017] Figure 2 This is a cross-sectional view and a partial view of section AA.

[0018] Figure 3 This is a side view of the present invention.

[0019] Figure 4 This is a top view of the present invention.

[0020] Figure 5 This is a perspective view of the present invention.

[0021] Figure 6-8 This is a schematic diagram of the tooling state of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0027] The following will combine Figure 1-8 This application provides a detailed description of a large transformer low-voltage bushing disassembly, assembly, and transfer device according to embodiments of the present application. It is worth noting that the following embodiments are merely for explaining the present application and do not constitute a limitation thereof.

[0028] Example 1:

[0029] like Figure 1 As shown, a large transformer low-voltage bushing disassembly, assembly, and transfer device includes: a frame, which is arranged around the low-voltage bushing and fixedly connected to the flange of the low-voltage bushing; and a screw assembly, which is arranged through the frame and can lift and transfer the low-voltage bushing.

[0030] This application utilizes a metal frame assembled with bolts, with the load borne by the threaded holes and bolt holes on the low-pressure bushing flange; simultaneously, a threaded rod is installed on the metal frame, and casters are installed below the threaded rod. The metal frame surrounding the bushing not only protects the bushing but also bears the load during installation and transportation.

[0031] See Figure 2-4The frame includes a square metal frame 1 and two side metal frames 2. The two square metal frames are trapezoidal and are respectively positioned on both sides of the low-pressure bushing. Four side metal frames are provided, connecting the upper and lower sides of the two square metal frames to form a single integrated frame. Four eye bolts are located at the top of each side metal frame. These eye bolts 6 are secured to the low-pressure bushing 12 by metal frame fixing bolts 5. Bolt holes are located at the center of the bottom of the square metal frames, which are then fixed to the low-pressure bushing flange by bushing load-bearing bolts.

[0032] In some embodiments, the frame further includes: a pull plate A8, a pull plate B9, and a bolt tensioner 7. The pull plate A and pull plate B are fixed to the flange of the low-pressure bushing by pull plate fixing bolts. The bottom of the lower side metal frame has a perforated pull plate, which is connected to the pull plate A by the bolt tensioner. The two ends of the bolt tensioner are locked by pins 7-1.

[0033] In some embodiments, the lead screw assembly includes a lead screw 3, a hexagonal metal block, a lead screw nut, and a universal caster 4. There are four lead screws, which are arranged through the side metal frame. The bottom of the lead screw is fixedly connected to the rotating plate on the universal caster. The lead screw nut is threaded onto the lead screw and is respectively set on the side metal frame. The hexagonal metal block is set on the top of the lead screw.

[0034] Its working process is as follows, such as Figure 5 As shown, by mounting the square metal frame 1 and the side metal frame 2 around the low-pressure bushing 12, the low-pressure bushing 12 is suspended vertically using the bushing bearing bolts 11, bolt tensioners 7, pull plates A8 and B9. Vertical displacement of the low-pressure bushing 12 can be achieved by rotating the hexagonal metal block 3-1 at the top of the screw 3 with a wrench; lifting operations can be performed using the four eye bolts 6. The low-pressure bushing 12 can be moved horizontally using the swivel casters 4.

[0035] The steps for disassembling the low-pressure bushing are as follows: Figures 6 to 8 As shown, the low-voltage bushing 12 is installed above the transformer 13, and the low-voltage lead or enclosed busbar 14 is installed directly above the low-voltage bushing 12. Initially as... Figure 6 As shown, the square metal frame 1 and the side metal frame 2 are installed around the low-voltage bushing 12, and the assembled metal frames are connected to the low-voltage bushing 12 using the bushing bearing bolts 11. Using a wrench, rotate the hexagonal metal block 3-1 at the top of the screw 3 to raise the low-voltage bushing 12 until the lead wire connection portion below the low-voltage bushing 12 exposes the transformer, as shown. Figure 7 As shown. At this point, install bolt tensioner 7, pull plate A8, and pull plate B9 to make the disassembly, assembly, and lifting of the low-voltage bushing 12 more stable. Then, move the low-voltage bushing 12 above the transformer 13 to an open position, and use eye bolts 6 to lift the low-voltage bushing 12 to the designated position, as shown. Figure 8As shown.

[0036] The installation process of the low-voltage bushing 12 is the reverse of the above disassembly steps. When the lead wire connection part of the low-voltage bushing 12 is inserted into the transformer 13, rotate the low-voltage bushing 12 to align the bushing flange bolt hole with the transformer flange bolt hole, and then continue to use a wrench to rotate the hexagonal metal block 3-1 at the top of the screw 3 to slowly lower the low-voltage bushing until the low-voltage bushing 12 falls on top of the transformer 13.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for disassembling, assembling, and transferring low-voltage bushings of large transformers, characterized in that, include: A frame is disposed around the low-pressure bushing and is fixedly connected to the flange of the low-pressure bushing. A lead screw assembly, which extends through the frame, is used to lift and transport the low-pressure bushing. The frame includes a square metal frame and side metal frames. There are two square metal frames, which are trapezoidal in shape and wider at the top than at the bottom. They are respectively set on both sides of the low-pressure bushing. There are four side metal frames, which connect the upper and lower sides of the two square metal frames to form an integral frame. There are bolt holes at the bottom center of the square metal frame, which are fixed to the low-pressure bushing flange by bushing bearing bolts. The frame also includes: a pull plate A, a pull plate B, and a bolt tensioner. The pull plate A and the pull plate B are fixed to the flange of the low-pressure bushing by pull plate fixing bolts. The bottom of the lower side metal frame has a perforated pull plate, which is connected to pull plate A by a bolt tensioner; The top of the side metal frame is equipped with four lifting eye bolts; The lead screw assembly includes a lead screw, a hexagonal metal block, a lead screw nut, and swivel casters. There are four lead screws, which are arranged through the side metal frame. The bottom of the lead screw is fixedly connected to the rotating plate on the swivel caster. The lead screw nut is threaded onto the lead screw and is respectively set on the side metal frame. The hexagonal metal block is set on the top of the lead screw.

2. The equipment for disassembling, assembling, and transferring low-voltage bushings of a large transformer according to claim 1, characterized in that, The bolt tensioner is locked at both ends by pins.

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