A special dismounting tool for a wobbler contact

Abstract

The utility model is suitable for the field of electric power equipment, provides a kind of plum blossom contact special dismounting tool, in structural design, tool body is tubular structure, both convenient to hold stable, and provide smooth sliding space for inner push rod;Outer push rod is arrayed along tool body axis, and inner push rod is linked through the linkage seat and connecting rod, the linear motion of inner push rod is converted into the synchronous opening and closing of outer push rod, ensure that static contact finger force is balanced, avoid deformation caused by unilateral force. Inner support block adopts arc surface design matched with the inner side of finger, and food-grade silica gel pad is matched, which not only increases friction to prevent slipping, but also can buffer contact pressure and avoid scratching the surface of the finger, fundamentally eliminating the risk of damage to traditional dismounting equipment. The sliding groove of inner push rod and the limiting protrusion of tool body are precisely matched, to ensure that there is no rotation deviation when stretching and retracting, further ensure that the opening angle of outer push rod is consistent, and improve the dismounting accuracy.

Description

Technical Field

[0001] This utility model relates to the field of power equipment, specifically a special disassembly tool for plum blossom contacts. Background Technology

[0002] The sprite-shaped contact is a core electrical connection component in high-voltage switchgear (such as GIS switchgear and medium- and low-voltage switchgear) and complete power distribution equipment. It achieves a tight fit with the stationary contact through the radial contraction force of its multi-lobed elastic contact fingers, ensuring stable transmission of high current and directly affecting the long-term operational reliability of power equipment and the security of power grid supply. During routine operation and maintenance, fault repair, and preventative testing of power systems, sprite-shaped contacts need to be disassembled periodically for surface cleaning, contact resistance testing, or replacement of aging contact fingers to prevent serious faults such as poor contact, localized overheating, or even arcing caused by thickened oxide layers and elasticity failure deformation of the contact fingers.

[0003] However, existing disassembly methods lack standardized specialized tools. Maintenance personnel often rely on general-purpose tools such as flathead screwdrivers and needle-nose pliers to pry or hammer the contacts, which can easily cause plastic deformation at the base of the stationary contact fingers, scratches and peeling of the silver plating layer, directly damaging its elastic recovery ability and conductivity, and even causing secondary faults such as contact finger breakage and insulation damage. In addition, the operating space inside high-voltage equipment is small, requiring 2-3 people to work together to adjust the prying angle and apply external force simultaneously. The process is cumbersome and time-consuming, with the average disassembly of a single set of contacts taking more than 15 minutes, which is inefficient. At the same time, brute force operation can easily cause tools to slip and injure personnel or accidentally touch live parts, posing a dual potential risk of equipment damage and electric shock.

[0004] Therefore, the development of a special disassembly tool for plum blossom contacts that can precisely control the spreading force and range, is easy for single-person operation, and causes no mechanical damage to the contact fingers has become an urgent industry need to solve the pain points of existing violent disassembly, reduce operation and maintenance costs, and ensure the quality and efficiency of power equipment operation and maintenance. Utility Model Content

[0005] The purpose of this utility model is to provide a special disassembly tool for plum blossom contacts to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A special disassembly tool for plum blossom contacts includes a tool body, an outer push rod, a connecting rod, an inner push rod, and a drive assembly. The tool body has a tubular structure. Multiple outer push rods are hinged to an array on the outer side wall of one end of the tool body, and an inner push rod is movably inserted into one end of the tool body. A connecting seat is fixedly provided at the end of the inner push rod. The connecting seat is connected to the outer push rod through multiple connecting rods. One end of the connecting rod is hinged to the side of the connecting seat, and the other end is hinged to the outer push rod. The drive assembly is used to provide power for the extension and retraction of the inner push rod.

[0008] As a further embodiment of this utility model: an inner support block is also fixedly provided at the end of the outer push rod. The inner support block is triangular in shape, and the side of the inner support block away from the axis of the tool body is an arc-shaped surface, on which a rubber pad is provided.

[0009] As a further embodiment of this utility model: the side wall of the inner push rod is also provided with multiple sliding grooves in an array, and the end of the tool body is fixedly provided with a limiting protrusion that is adapted to slide with the sliding groove.

[0010] As a further embodiment of this utility model: the driving assembly includes a screw rotatably disposed at the other end of the tool body and a power unit for driving the screw to rotate, and the inner push rod is threadedly mounted on the screw.

[0011] As a further embodiment of this utility model: the power unit includes a fixed box fixedly installed at the end of the tool body, a worm gear rotatably installed in the fixed box, and a worm wheel meshing with the worm gear, wherein the worm wheel is coaxially fixedly installed on the screw.

[0012] As a further embodiment of this utility model: a drive shaft is rotatably mounted on the fixed box, a knob is mounted on one end of the drive shaft, a first gear is mounted on the other end, and a second gear that meshes with the first gear is fixedly mounted on the worm gear.

[0013] As a further aspect of this utility model: the diameter of the first gear is smaller than the diameter of the second gear.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In terms of structural design, the tool body of this utility model has a tubular structure, which facilitates stable grip and provides smooth sliding space for the inner push rod. The outer push rods are arrayed along the axis of the tool body and are linked to the inner push rods through the connecting seat and connecting rod, converting the linear motion of the inner push rods into the synchronous opening and closing of the outer push rods. This ensures balanced force on the stationary contact finger and avoids deformation caused by unilateral force. The inner support block adopts an arc-shaped surface design that fits the inner side of the contact finger, and is equipped with a food-grade silicone pad. This increases friction to prevent slippage and buffers contact pressure to avoid scratching the contact finger surface, fundamentally eliminating the risk of equipment damage from traditional disassembly. The sliding groove of the inner push rod and the limiting protrusion of the tool body precisely match to ensure no rotational offset during extension and retraction, further ensuring consistent opening angle of the outer push rod and improving disassembly accuracy.

[0016] 2. The drive assembly of this utility model adopts a multi-stage reduction and torque amplification structure of "gear-worm-screw": the diameter difference between the first and second gears achieves first-stage reduction, and the meshing transmission of the worm and worm wheel completes second-stage reduction. After doubly amplifying the torque, it can be easily driven by a single person turning the knob. Even when facing rusted and stuck static contacts, it can be smoothly opened, avoiding the laborious problems of traditional operation. The fixing box is made of die-cast aluminum alloy, sealing and protecting the internal gear set to prevent dust from entering and extend the service life of the assembly. The screw uses a trapezoidal thread to mesh with the inner push rod, which not only ensures smooth transmission but also has an excellent self-locking function. After opening, there is no risk of the inner push rod retracting on its own, and it can maintain a stable state without continuous force, ensuring operational safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the special disassembly tool for plum blossom contacts of this utility model;

[0018] Figure 2 This is a bottom view of the special disassembly tool for the plum blossom contact of this utility model;

[0019] Figure 3 for Figure 1 A partial cross-sectional schematic diagram;

[0020] Figure 4 for Figure 1 Enlarged schematic diagram of the inner and outer push rod sections;

[0021] Figure 5 for Figure 1 A schematic diagram of the internal structure of the central fixing box.

[0022] The component reference numerals in the above figures are explained as follows:

[0023] 1. Tool body; 2. Outer push rod; 3. Connecting rod; 4. Inner push rod; 5. Connecting seat; 6. Inner support block; 7. Slide groove; 8. Screw; 9. Fixing box; 10. Worm gear; 11. Worm wheel; 12. Drive shaft; 13. First gear; 14. Second gear; 15. Knob. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of those features. In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in 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] Example 1

[0027] Please see Figure 1-5 A special disassembly tool for plum blossom contacts includes a tool body 1, an outer push rod 2, a connecting rod 3, an inner push rod 4, and a drive assembly. This tool is specifically designed for disassembling the stationary contacts of plum blossom contacts in high-voltage switchgear. It addresses the pain points of the background technology, such as "violent disassembly damaging equipment, cumbersome operation, and high safety risks," and achieves precise, non-destructive, and convenient single-person operation.

[0028] The tool body 1 has a tubular structure. The tool body 1 is made of 45 steel with heat treatment and chrome plating for rust prevention. It provides stable support for the internal components. The tubular structure facilitates the axial sliding of the inner push rod 4 and makes it easy for the operator to hold and improves the stability of operation.

[0029] Multiple external push rods 2 are hinged to an array on one side of the outer wall of the tool body 1, and an internal push rod 4 is movably inserted into one side of the tool body 1. The external push rods 2 are made of stainless steel and are evenly distributed along the axis of the tool body 1 to ensure that the static contact finger is subjected to balanced force when it is opened. The internal push rod 4 is a precision machined part with a smooth surface, which can accurately extend and retract along the tool body 1 to drive the external push rods 2 to open and close synchronously.

[0030] The end of the inner push rod 4 is fixedly provided with a connecting seat 5. The connecting seat 5 is connected to the outer push rod 2 through multiple connecting rods 3. The connecting rods 3 are made of high-strength aluminum alloy and have wear-resistant bushings at both ends of the hinge, so that the rotation is smooth and without jamming. The connecting seat 5 is welded and fixed to the inner push rod 4 and can move synchronously with the inner push rod 4. The linear motion of the inner push rod is converted into the opening and closing motion of the outer push rod 2 through the connecting rods 3, so as to achieve uniform opening of the static contact and avoid deformation of the contact finger due to unilateral force.

[0031] The drive assembly is used to provide power for the extension and retraction of the inner push rod 4. The drive assembly adopts a gear-worm gear-screw transmission structure, which has the functions of speed reduction and torque increase and self-locking. It is easy to operate and there is no risk of retraction after it is extended, thus ensuring the safety of operation.

[0032] Example 2

[0033] Please see Figure 1-4The end of the outer push rod 2 is also fixedly provided with an inner support block 6. The inner support block 6 is triangular in shape, and the side of the inner support block 6 away from the axis of the tool body 1 is arc-shaped. A rubber pad is provided on the arc-shaped surface. The arc of the inner support block 6 is adapted to the inner side of the stationary contact finger to avoid excessive local pressure. The rubber pad is made of food-grade silicone material, which can prevent slippage when it is opened and also prevent scratches on the surface of the contact finger.

[0034] Example 3

[0035] Please see Figure 3 The inner push rod 4 has multiple sliding grooves 7 arranged in an array on its side wall. The end of the tool body 1 is fixedly provided with a limiting protrusion that slides and adapts to the sliding groove 7. The sliding groove 7 is long and narrow, and it fits with the limiting protrusion with a gap to provide precise guidance for the inner push rod 4, prevent it from rotating and deviating when it extends and retracts, ensure that the outer push rod 2 opens at a consistent angle, and improve the accuracy of disassembly.

[0036] Example 4

[0037] Please see Figure 3 The drive assembly includes a screw 8 rotatably mounted on the other end of the tool body 1 and a power unit that drives the screw 8 to rotate. The inner push rod 4 is threadedly mounted on the screw 8. The screw 8 has a trapezoidal thread that meshes tightly with the inner thread of the inner push rod 4. When the screw 8 rotates, it can smoothly drive the inner push rod 4 to extend and retract. The trapezoidal thread has a self-locking function, so no additional locking is required after it is extended, preventing the inner push rod 4 from retracting on its own and ensuring operational safety.

[0038] Example 5

[0039] Please see Figure 5 The power unit includes a fixed box 9 fixedly installed at the end of the tool body 1, a worm gear 10 rotatably installed inside the fixed box 9, and a worm wheel 11 meshing with the worm gear 10. The worm wheel 11 is coaxially fixedly installed on the screw 8. The fixed box 9 is made of die-cast aluminum alloy, which seals and protects the internal gear set to prevent dust from entering. The meshing transmission ratio of the worm gear 10 and the worm wheel 11 is 1:20, which realizes speed reduction and torque increase, reduces operating torque, and can be driven by a single person, solving the problem of "laborious" operation in traditional operation.

[0040] Example 6

[0041] Please see Figure 5The fixed box 9 is also rotatably mounted with a drive shaft 12. A knob 15 is mounted on one end of the drive shaft 12, and a first gear 13 is mounted on the other end. A second gear 14 that meshes with the first gear 13 is fixedly mounted on the worm gear 10. The diameter of the first gear 13 is smaller than the diameter of the second gear 14. The difference in diameter between the first gear 13 and the second gear 14 constitutes a two-stage reduction structure, which further amplifies the torque, making operation easier. Even when facing rusted and stuck static contacts, it can be easily opened, while reducing the impact force during operation and preventing sudden deformation of the contact fingers.

[0042] Working principle:

[0043] Before use, confirm the tool's compatibility based on the size of the stationary contact. Hold the main body 1 of the tool and insert the inner support block 6 at the end of the outer push rod 2 into the stationary contact, ensuring that the arc-shaped surface of the inner support block 6 fits against the inner side of the stationary contact finger. Rotate the knob 15 on the fixing box 9, and the drive shaft 12 drives the first gear 13 to rotate. Through meshing with the second gear 14, a first-stage reduction and torque increase are achieved, which in turn drives the worm gear 10 to rotate. The worm gear 10 meshes with the worm wheel 11 to complete a second-stage reduction, driving the screw 8 to rotate synchronously.

[0044] When the screw 8 rotates, its threaded engagement with the inner push rod 4 drives the inner push rod 4 to extend outward along the axial direction of the tool body 1. The connecting seat 5 at the end of the inner push rod 4 pulls the outer push rod 2 outward synchronously around the hinge point via the connecting rod 3. The inner support block 6 applies a uniform radial support force to the stationary contact finger. Due to the arc-shaped surface and rubber pad design of the inner support block 6, scratches or unilateral deformation of the contact finger are avoided. During the sliding process of the inner push rod 4, the slide groove 7 and the limiting protrusion provide precise guidance to ensure consistent opening angles. When the contact finger is extended to the removable distance, the trapezoidal thread self-locking function of the screw 8 keeps the inner push rod 4 fixed, eliminating the need for continuous force application.

[0045] The operator smoothly pulls out the stationary contact using the gripping end of the tool body 1. After disassembly, the knob 15 is rotated in the opposite direction, causing the drive component to retract the inner push rod 4. The connecting rod 3 pulls the outer push rod 2 back to its original position, and the inner support block 6 disengages from the stationary contact, restoring the tool to its initial state. This design, through a "multi-stage deceleration and torque increase + synchronous and uniform opening + anti-slip and anti-scratching" structure, solves the defects of traditional forceful disassembly. A single person can complete the operation without the risk of finger deformation or scratches, ensuring the quality and safety of power equipment operation and maintenance.

[0046] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods, and any method that can achieve its beneficial effects can be implemented.

[0047] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A special disassembly tool for plum blossom contacts, characterized in that, The tool body (1) includes an outer push rod (2), a connecting rod (3), an inner push rod (4), and a drive assembly. The tool body (1) has a tubular structure. Multiple outer push rods (2) are hinged to one side of the outer wall of the tool body (1), and an inner push rod (4) is movably inserted into one side of the tool body (1). A connecting seat (5) is fixedly provided at the end of the inner push rod (4). The connecting seat (5) is connected to the outer push rod (2) through multiple connecting rods (3). One end of the connecting rod (3) is hinged to the side of the connecting seat (5), and the other end is hinged to the outer push rod (2). The drive assembly is used to provide power for the extension and retraction of the inner push rod (4).

2. The special disassembly tool for plum blossom contacts according to claim 1, characterized in that, The end of the outer push rod (2) is also fixedly provided with an inner support block (6). The inner support block (6) is triangular in shape, and the side of the inner support block (6) away from the axis of the tool body (1) is an arc surface, and a rubber pad is provided on the arc surface.

3. The special disassembly tool for plum blossom contacts according to claim 1, characterized in that, The inner push rod (4) has multiple grooves (7) arranged in an array on its side wall, and the end of the tool body (1) is fixedly provided with a limiting protrusion that is adapted to slide with the grooves (7).

4. The special disassembly tool for plum blossom contacts according to claim 1, characterized in that, The drive assembly includes a screw (8) rotatably disposed at the other end of the tool body (1) and a power unit for driving the screw (8) to rotate, wherein the inner push rod (4) is threadedly mounted on the screw (8).

5. The special disassembly tool for plum blossom contacts according to claim 4, characterized in that, The power unit includes a fixed box (9) fixedly installed at the end of the tool body (1), a worm (10) rotatably installed in the fixed box (9), and a worm wheel (11) meshing with the worm (10). The worm wheel (11) is coaxially fixedly installed on the screw (8).

6. The special disassembly tool for plum blossom contacts according to claim 5, characterized in that, A drive shaft (12) is rotatably mounted on the fixed box (9). A knob (15) is mounted on one end of the drive shaft (12), and a first gear (13) is mounted on the other end. A second gear (14) that meshes with the first gear (13) is fixedly mounted on the worm (10).

7. The special disassembly tool for plum blossom contacts according to claim 6, characterized in that, The diameter of the first gear (13) is smaller than the diameter of the second gear (14).

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