Hoisting bracket for overhauling hoisting core of on-load switch of transformer and use method of hoisting bracket
By designing a lifting bracket for the transformer on-load switch hanging core maintenance, the on-load switch can be accurately lifted and moved using a rotating support and translation mechanism, which solves the safety and economy problems of the existing lifting method and improves the maintenance efficiency and convenience.
Patent Information
- Application Number
- CN202511283698.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-09
- Publication Date
- 2025-10-17
AI Technical Summary
Existing methods for lifting transformer on-load switches have problems such as insufficient safety, poor economy and convenience, especially in areas with densely populated live equipment in substations, where the operation is complex and costly.
A lifting bracket for the maintenance of transformer on-load switch cores is designed, which includes a bracket assembly, a fixing assembly and an electric hoist. The 360-degree rotation and horizontal movement of the on-load switch are achieved through a rotating support mechanism and a translation mechanism. Combined with the lifting function of the electric hoist, a modular design is adopted to facilitate assembly and transportation.
It realizes the safe and efficient lifting and all-round movement of the on-load switch, avoids the problems of muscle injury to personnel and high equipment costs, simplifies the operation process, reduces the cost of safety monitoring, and is suitable for the maintenance environment with limited space inside the substation.
Smart Images
Figure CN120793716A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of power equipment maintenance, and particularly relates to a hoisting support for transformer on-load switch core hoisting maintenance and a use method thereof. BACKGROUND
[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.
[0003] In the operation and maintenance of the power system, the on-load regulating switch of the main transformer of the substation needs to be regularly hoisted for maintenance to ensure its reliable operation. At present, the hoisting and maintenance operation of the on-load switch in the industry mainly relies on two ways: pure manpower lifting and mechanical hoisting with a large crane.
[0004] The first manpower hoisting method usually requires multiple maintenance personnel to operate together. During the operation, the personnel need to stand on the top platform of the transformer and rely entirely on physical strength to lift the on-load switch out of the narrow switch room, lower it to the ground, and then lift it again and accurately align it for reinstallation after the maintenance is completed. This method is low in efficiency and high in safety risk.
[0005] The second crane hoisting method saves part of the manpower, but introduces other more complex problems. First, the use cost of the crane equipment itself is high. Second, the crane is a large machine, and its entry, station and operation in the area of the dense live equipment of the substation are subject to strict safety distance restrictions, often requiring expansion of the power-off range and complex safety control arrangement, greatly increasing the complexity and safety monitoring cost of the work.
[0006] In summary, the existing two hoisting methods have obvious defects, either in safety or in economy and convenience. Therefore, there is an urgent need in the field for an on-load switch hoisting and maintenance device specially used in the transformer platform environment, which has safety, lightness and economy, to fundamentally solve the long-standing technical problems. SUMMARY
[0007] To overcome the shortcomings of the prior art, the present application provides a hoisting support for transformer on-load switch core maintenance and a use method thereof, which can safely and efficiently realize the hoisting and all-around movement of the on-load switch core.
[0008] To achieve the above-mentioned purpose, one or more embodiments of the present application provide the following technical solutions: The present application provides a hoisting support for transformer on-load switch core maintenance in the first aspect.
[0009] The hoisting support for transformer on-load switch core maintenance comprises a support assembly, a fixing assembly and an electric hoist. The support assembly comprises a bottom corner support frame, a lower stand column and an upper stand column; the lower stand column is fixedly installed above the bottom corner support frame and is rotationally connected with the bottom of the upper stand column through a rotary support mechanism; a horizontal suspension arm is fixedly installed at the top of the upper stand column; The fixing assembly comprises a transverse suspension arm arranged below the rotary support mechanism and fixedly arranged above the lower stand column; the rotary support mechanism is composed of a conical pressure bearing and a circular bearing respectively used for bearing axial load and radial load; The electric hoist is hung below the horizontal suspension arm and is used for realizing hoisting and omnidirectional movement of the load switch hoisting core under the cooperation of the horizontal suspension arm and the transverse suspension arm.
[0010] Further, the bottom corner support frame is a cross-shaped plane support structure which is composed of four square steel pipes symmetrically welded on a connecting sleeve at an angle of 90 degrees, and the connecting sleeve is fixedly connected with the bottom of the lower stand column.
[0011] Further, the rotary support mechanism is further provided with a locking device, and the locking device is a top screw which is used for abutting against the upper stand column and fixing the upper stand column at a preset rotation angle when being screwed.
[0012] Further, a translation mechanism composed of a rack and a gear connected with the electric hoist is arranged on the horizontal suspension arm, and the electric hoist is driven to move along the length direction of the horizontal suspension arm by rotating a crank connected with the gear.
[0013] Further, the rack on the horizontal suspension arm is a straight toothed rack, and the length of the straight toothed rack is greater than the transverse movement stroke of the load switch hoisting hole.
[0014] Further, hanging holes for hanging the stay ropes are arranged at opposite ends of the transverse suspension arm respectively, and the transverse suspension arm is connected and fixed through the stay ropes hung in the hanging holes.
[0015] Further, the stay ropes are made of nylon and are matched with ratchet type tighteners.
[0016] Further, the electric hoist is integrated with a double-brake system including an electromagnetic brake and a mechanical disc brake, and is used for automatic locking in the case of power failure.
[0017] Further, the electric hoist is integrated with a remote control function.
[0018] The second aspect of the present application provides a use method of the hoisting support for transformer load switch hoisting core maintenance.
[0019] The use method of the hoisting support for transformer load switch hoisting core maintenance comprises the following steps. Place the bottom corner support frame steadily; install the fixing assembly, fasten the box along the fastener to the transformer box along, and connect the transverse suspension arm with the box along fastener using the cable-stayed rope and the ratchet type tightener, adjust the tension of each cable-stayed rope to keep the lower stand column vertical; hang the safety belt on the safety belt hanging ring of the upper stand column; operate the electric hoist to slowly lift the on-load switch until it is separated from the original installation position; Transport the on-load switch outside the transformer platform by rotating the upper stand column and the horizontal suspension arm manually through the rotating support mechanism; drive the gear and rack mechanism by operating the rocking handle to horizontally move the electric hoist and the on-load switch to the expected position; slowly lower the electric hoist to finally place the on-load switch safely on the ground maintenance area. The above one or more technical solutions have the following beneficial effects: (1) The transformer on-load switch core hoisting and maintenance lifting support improves the on-load switch core hoisting and maintenance lifting support, a horizontal suspension arm is fixedly installed at the top of the upper stand column, and a transverse suspension arm is installed below the rotating support mechanism and above the lower stand column. Therefore, the on-load switch can be rotated by 360 degrees in the air and accurately positioned in the horizontal direction through the rotating support mechanism and the translation mechanism, so that the heavy object can be easily and accurately transported to the outside of the transformer platform and placed at the specified position, and the risk of muscle injury and instability caused by directly lifting the heavy object by personnel is completely avoided.
[0020] (2) The lifting support in the present application is designed in a modular manner, can be easily carried to the transformer platform and quickly assembled, does not need to use large cranes and special operating personnel, saves high mechanical rental and labor costs. The operation range is completely limited to the transformer body, without considering the safety distance from the surrounding live equipment, without expanding the power-off range or performing complex on-site safety control for crane access and work, greatly simplifying the operation process, reducing the difficulty and cost of safety monitoring, and being particularly suitable for maintenance environments with limited internal space and high safety requirements in a substation, having high economic efficiency and convenience.
[0021] Advantages of the additional aspects of the present application will be given in part in the following description, part will become apparent from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0022] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application given below, serve to explain the application, and do not constitute an improper limitation of the application.
[0023] Figure 1 It is a structural diagram of the lifting support in the embodiment one of the present application.
[0024] Figure 2 It is a structural diagram of the horizontal suspension arm in the embodiment one of the present application.
[0025] Figure 3 Structure diagram of the horizontal cantilever in embodiment one of the present application.
[0026] In the figure: 1, bottom corner support frame; 2, lower stand column; 3, upper stand column; 4, horizontal cantilever; 5, horizontal lifting arm; 51, rack; 52, gear; 53, crank handle; 6, inclined cable; 7, hanging connection hole; 8, rotating support mechanism. DETAILED DESCRIPTION
[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.
[0028] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application.
[0029] In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0030] Embodiment one The present embodiment discloses a hoisting support for transformer on-load switch hoisting core maintenance.
[0031] The hoisting support for transformer on-load switch hoisting core maintenance comprises: a support assembly, a fixing assembly and an electric hoist. The support assembly comprises a bottom corner support frame, a lower stand column and an upper stand column; wherein the lower stand column is fixedly installed above the bottom corner support frame and is rotationally connected with the bottom of the upper stand column through a rotating support mechanism; a horizontal lifting arm is fixedly installed at the top of the upper stand column; The fixing assembly comprises a horizontal cantilever arranged below the rotating support mechanism and fixedly arranged above the lower stand column; the rotating support mechanism is composed of a conical pressure bearing and a circular bearing respectively used for bearing axial load and radial load; The electric hoist is hung below the horizontal lifting arm and is used for realizing hoisting and omnidirectional movement of the on-load switch hoisting core under the cooperation of the horizontal lifting arm and the horizontal cantilever.
[0032] Based on the above structural design, the present application can safely and efficiently realize hoisting and omnidirectional movement of the on-load switch hoisting core. In order to facilitate the understanding of the technical solution of the present application, the specific implementation method in the technical solution of the present application will be further explained and described below.
[0033] As shown in FIG. 1, the hoisting support for transformer on-load switch hoisting core maintenance comprises: a support assembly, a fixing assembly and an electric hoist. Figure 1
[0034] The support assembly is used to provide main support and movement functions, and its core load-bearing structure includes a bottom corner support frame 1, a lower column 2 and an upper column 3. The bottom end of the lower column 2 is fixedly installed above the center of the bottom corner support frame 1 by welding or flange connection, etc. to transfer the load. The bottom of the upper column 3 is rotatably connected with the top end of the lower column 2 through a rotary support mechanism 8, so that the upper column 3 and the components above it can rotate relative to the lower column 2. A horizontal boom 5 is fixedly installed at the top of the upper column 3 by welding or high-strength bolt, for carrying a translation mechanism and a lifting module (electric hoist).
[0035] The fixing assembly is used to reliably connect the entire support system with the transformer body to increase stability and prevent overturning. It includes a transverse cantilever 4 arranged below the rotary support mechanism 8 and fixedly installed on the upper part of the lower column 2 (i.e. on the rod body below the rotary support mechanism 8). The rotary support mechanism 8, as a core component for connecting the upper and lower columns and realizing rotation, is composed of a conical pressure bearing for bearing axial load (mainly from the hoisting weight) and a circular bearing (such as a deep groove ball bearing) for bearing radial load (mainly from the overturning moment), which together ensure the stability and load-bearing capacity during rotation.
[0036] The electric hoist (not shown in the figure) is suspended below the horizontal boom 5 through its own trolley or suspension device. Its steel wire rope lower hook is used to connect the on-load tap changer. The lifting function of the electric hoist, combined with the horizontal movement freedom provided by the horizontal boom 5 and the rotation freedom provided by the rotary support mechanism 8, enables the on-load tap changer to realize hoisting and full-range movement in space under the cooperative support and positioning of the horizontal boom and the transverse cantilever.
[0037] Further, the bottom corner support frame 1 is a cross-shaped planar support structure. Its specific manufacturing method is as follows: four square steel pipes (such as 40mm*40mm square steel) with equal length are selected, which are perpendicularly arranged at an angle of 90 degrees and symmetrically welded around a central connecting sleeve, thereby forming a stable cross-shaped base. The inner diameter of the connecting sleeve matches the outer diameter of the bottom of the lower column 2. During installation, the bottom of the lower column 2 is inserted into the connecting sleeve, and then the connecting sleeve and the bottom of the lower column 2 are fixedly connected by welding or pin fastening. This structure provides a wide support surface and enhances the overturning stability.
[0038] The rotating support mechanism 8 is also provided with a locking device. The specific form of the locking device is a jackscrew. The jackscrew is radially (i.e. horizontally) screwed into the threaded hole of the bearing seat or fixed sleeve ring fixed at the top end of the lower vertical column 2. When the upper vertical column 3 is rotated to the desired working angle (i.e. the preset rotation angle) through the bearing, the jackscrew is tightened, and the front end of the jackscrew will abut against and press the outer wall of the upper vertical column 3 inward, thereby limiting the rotation of the upper vertical column 3 through the generated large friction force, so as to firmly fix it at the preset rotation angle, preventing the accidental rotation of the lifting arm during lifting.
[0039] As shown in Figure 2 , a set of translation mechanism is provided on the horizontal lifting arm 5. The mechanism is composed of a rack 51 and a gear 52. The rack 51 is fixed on the upper surface or one side of the horizontal lifting arm 5 by bolts or directly welded, and is arranged along the length direction of the lifting arm. The gear 52 is engaged with the rack 51, and the gear 52 is connected with the running trolley of the electric hoist or the lifting point fixing seat (i.e. the electric hoist is suspended on the seat). The crank 53 is connected with the rotating shaft of the gear 52 through shaft or coupling. During operation, rotating the crank 53 can drive the gear 52 to rotate, and in the process of engaging with the fixed rack 51, the gear 52 drives the whole electric hoist to move smoothly and linearly along the length direction of the horizontal lifting arm 5, thereby realizing the horizontal position adjustment of the hoisted load.
[0040] The rack 51 on the horizontal lifting arm 5 is a straight toothed rack. Its length is determined according to the on-site operation requirements, but needs to be greater than the maximum stroke of the transverse movement required by the load switch lifting hole. This means that the rack provides sufficient movement range to ensure that the operator can smoothly move the electric hoist and its hoisted load, the load switch, from the position directly opposite the transformer switch chamber to the barrier-free area outside the transformer platform, so as to safely lower it.
[0041] As shown in Figure 3 , hanging holes 7 are respectively machined or welded at the opposite ends (i.e. the two ends away from the lower vertical column 2) of the transverse cantilever 4. The transverse cantilever 4 obtains additional lateral support through the stayed ropes 6 (the other end is connected to the fastener or other firm fixing point along the transformer tank) hung on these hanging holes 7. The stayed ropes 6 exert tension through the hanging holes 7, forming a stable spatial force system, which together ensures that the main vertical rods (the lower vertical column 2 and the upper vertical column 3) can maintain vertical state when under stress, preventing side overturning.
[0042] The stayed ropes 6 are made of nylon material, which has the characteristics of light weight, high strength and corrosion resistance. Each stayed rope 6 is matched with a ratchet type tightener. The tightener is integrated on the nylon belt or connected in series as an independent component. By reciprocating the ratchet wrench, the nylon belt can be easily and unidirectionally tightened, realizing the tensioning of the stayed rope; the internal ratchet mechanism can prevent it from loosening in the opposite direction, which is labor-saving and reliable.
[0043] Further, the electric hoist is integrated with a double-brake system. The first brake is an electromagnetic brake, which is attracted under the condition of power-on, allowing the motor to rotate; when the power is off, the electromagnetic force disappears, and the brake immediately locks the motor shaft under the action of the spring. The second brake is a mechanical disc brake (or called load self-locking brake), which directly acts on the drum or gear system, adopts a normally closed design, and automatically locks when power failure or system pressure loss occurs, preventing the heavy object from falling. The two systems back up each other, greatly improving the safety.
[0044] The electric hoist is integrated with a remote control function. This function is realized through a separate handheld wireless remote control. The remote control communicates with the wireless receiving module in the electric hoist body, and the operator can control the lifting, lowering, and stopping of the electric hoist through the remote control buttons from a safe position far away from the electric hoist, such as a corner on the transformer platform, avoiding the risk of close-range operation and being more safe and convenient.
[0045] The lifting support of the present application adopts lightweight and modular design. The main load-bearing components such as the horizontal cantilever 4, horizontal lifting arm 5, and bottom corner support 1 are all made of square steel tubes (such as 40mm*4mm square tubes), effectively reducing the weight while ensuring strength. Through optimized structural design, the total weight of the entire tool is controlled within 41 kg. The entire support is assembled from multiple components, which are connected by pins, bolts, or quick-release clamps. The heaviest single component (including the lower stand and the support part of the bottom corner support) weighs only 17 kg. This design allows each module to be easily passed up and down by the operator on the transformer ladder, and enables quick on-site installation and disassembly on the platform, greatly improving work efficiency and portability.
[0046] Embodiment Two The embodiment discloses a method for using a transformer load switch hoisting core maintenance lifting support.
[0047] The method for using a transformer load switch hoisting core maintenance lifting support comprises: Place the bottom corner support stably; install the fixing assembly, fasten the box rail buckle to the transformer box rail, and connect the horizontal cantilever and the box rail buckle with the stay rope and the ratchet tightener, adjust the tension of each stay rope to keep the lower stand vertical; hang the safety belt on the safety belt hanging ring of the upper stand; operate the electric hoist to slowly lift the load switch until it is separated from the original installation position. The upper stand column and the horizontal boom are manually rotated by rotating the supporting mechanism, the load switch is transported outside the transformer platform, the electric hoist and the load switch are horizontally moved to the expected position by operating the handle to drive the gear rack mechanism, the electric hoist is slowly lowered, and finally the load switch is safely placed on the ground maintenance area. The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.
Claims
1. The lifting bracket for the transformer on-load switch hanging core maintenance is characterized by: include: Bracket assembly, fixing assembly and electric hoist; The bracket assembly includes a bottom angle support frame, a lower column and an upper column; wherein the lower column is fixedly installed above the bottom angle support frame and is rotatably connected to the bottom of the upper column through a rotating support mechanism; a horizontal boom is fixedly installed on the top of the upper column; The fixed assembly includes a transverse cantilever disposed below the rotary support mechanism and fixed above the lower column; the rotary support mechanism is composed of a tapered pressure bearing and a circular bearing for bearing axial loads and radial loads respectively; The electric hoist is suspended below the horizontal boom and is used to realize the hoisting and omnidirectional movement of the on-load switch hanging core under the coordinated action of the horizontal boom and the transverse boom.
2. The transformer on-load switch hanging core maintenance hanging bracket according to claim 1, characterized in that: The bottom angle support frame is a cross-shaped plane support structure, which is composed of four square steel pipes symmetrically welded at a 90-degree angle on a connecting sleeve, and the connecting sleeve is fixedly connected to the bottom of the lower column.
3. The transformer on-load switch hanging core maintenance hanging bracket according to claim 1, characterized in that: The rotation support mechanism is further provided with a locking device, which is a jackscrew for pressing against the upper column and fixing it at a preset rotation angle when tightened.
4. The transformer on-load switch hanging core maintenance hanging bracket according to claim 1, characterized in that: The horizontal boom is provided with a translation mechanism consisting of a rack and a gear connected to the electric hoist. By rotating the crank connected to the gear, the electric hoist is driven to move along the length direction of the horizontal boom.
5. The transformer on-load switch hanging core maintenance hanging bracket according to claim 1, characterized in that: The rack on the horizontal boom is a spur rack, and the length of the spur rack is greater than the lateral movement stroke of the on-load switch lifting hole.
6. The transformer on-load switch hanging core maintenance hanging bracket according to claim 1, characterized in that: Hanging holes for hanging oblique ropes are respectively provided at opposite ends of the transverse cantilever, and the transverse cantilever is connected to a fixed point through the oblique ropes hung on the hanging holes.
7. The transformer on-load switch hanging core maintenance hanging bracket according to claim 6, characterized in that: The inclined rope is made of nylon belt material and is equipped with a ratchet tightener.
8. The transformer on-load switch hanging core maintenance hanging bracket according to claim 1, characterized in that: The electric hoist is integrated with a dual brake system, including an electromagnetic brake and a mechanical disc brake, which is used for automatic locking in the event of power outage or power failure.
9. The transformer on-load switch hanging core maintenance hanging bracket according to claim 8, characterized in that: The electric hoist is integrated with a remote control function.
10. The method for using the lifting bracket for the transformer on-load switch hanging core maintenance is characterized in that: include: Place the bottom angle support bracket steadily; install the fixing assembly, fasten the box edge fastener to the transformer box edge, and use the inclined rope and ratchet tightener to connect the horizontal cantilever to the box edge fastener. Adjust the tension of each inclined rope to keep the lower column vertical; hang the safety belt on the safety belt hanging ring of the upper column; operate the electric hoist to slowly lift the load switch until it is out of its original installation position; Manually rotate the upper column and horizontal boom through the rotating support mechanism to transfer the on-load switch to the outside of the transformer platform; operate the crank to drive the gear rack mechanism to move the electric hoist and the on-load switch horizontally to the desired position; slowly lower the electric hoist and finally safely place the on-load switch in the ground maintenance area.