High-voltage disconnector correction and closing tool with limiting protection function

Abstract

The utility model relates to power operation tool technical field especially, it is a kind of high-voltage disconnecting switch rectification pull together tool with limit protection function, it includes insulating rod, shell, spring, sliding block, guide plate, gyro wheel and closing guide slot. Through the rectification of movable contact offset of guide plate and gyro wheel cooperation effect, utilize gyro wheel and static contact and realize closing end point limit protection, while sliding block and shell precision cooperation ensure movement stability. The utility model can automatically rectify movable contact offset, improve closing accuracy, reduce operation difficulty, avoid the damage of equipment caused by excessive operation, guarantee operation safety and improve tool durability.

Description

Technical Field

[0001] This utility model belongs to the field of power operation tool technology, specifically a high-voltage disconnect switch correction and opening tool with limit protection function. Background Technology

[0002] In the field of power system operation and maintenance, the operating tools for high-voltage disconnect switches play a crucial role in ensuring the safe operation of the power grid. Particularly during the opening and closing operations of 10kV pole-mounted disconnect switches, problems such as easy displacement of moving contacts, low operational accuracy, and the lack of effective limit protection mechanisms are common. Traditional disconnecting rods mostly adopt rigid structures, and their operation relies on manual experience to control direction and force. Improper force or angular deviations can easily lead to incomplete closing of the disconnect switch, contact burnout, or even equipment damage, seriously affecting power supply reliability and operational safety. Furthermore, in complex operating conditions or high-altitude work environments, operators find it difficult to achieve precise positioning, and existing tools typically lack effective limit mechanisms, failing to prevent excessive pushing and further exacerbating safety hazards.

[0003] In the prior art, patent CN112420413B discloses an auxiliary insulating rod pulling device. This device reduces swaying during long rod operation through mechanical support, thereby improving positioning accuracy and is suitable for high-altitude switch operation. However, this solution only addresses the stability problem of the pulling rod lifting and does not involve guiding and correcting the movement trajectory of the disconnecting switch's moving contact. It cannot correct contact offset caused by initial misalignment during closing. Furthermore, the device lacks a limit protection mechanism, and excessive thrust may still cause impact or damage to the mechanism near the closing endpoint, making it difficult to meet the requirements for refined and safe operation.

[0004] Another patent, CN119742192B, discloses a damped adjustable insulating rod that uses electromagnetic induction to mitigate the impact force during closing, effectively protecting the closing equipment. While this technology has certain advantages in mitigating operational shock, its core function focuses on torque buffering and does not provide physical guidance or trajectory correction for the moving contact of the disconnector, thus failing to solve the alignment problem in the initial closing stage. Furthermore, its damping adjustment is a passive response mechanism, lacking active limit functionality and unable to forcibly stop the advancing action upon reaching the closing endpoint, still posing a risk of over-alignment.

[0005] The aforementioned problems indicate that while existing switching tools have made improvements in structural support and impact buffering, significant deficiencies remain in two crucial aspects: the correction of the moving contact trajectory during the closing process and the active limit protection at the endpoint. Especially in actual field operations, the tool needs to guide the moving contact along the correct path while preventing further force application that could damage the equipment after the switch is fully closed. Therefore, a new type of switching tool integrating correction guidance and limit protection functions is urgently needed to improve the accuracy and safety of closing operations and meet the actual needs of power system operation and maintenance. Utility Model Content

[0006] This invention addresses the shortcomings of existing high-voltage disconnector operating tools in terms of moving contact offset correction, operational accuracy improvement, and limit protection. It provides a high-voltage disconnector correction and closing tool with limit protection functionality. Through a unique structural design and the synergistic effect of its components, the tool achieves precise guidance of the moving contact's trajectory and active limit protection at its endpoint, thereby significantly improving the accuracy and safety of the closing operation.

[0007] This utility model provides a high-voltage disconnector switch correction and opening tool with limit protection function, including an insulating rod, a housing, a spring, a slider, a guide plate, a roller, and a closing guide groove. The insulating rod is a slender rod-shaped structure made of fiberglass, with its length set according to actual operational needs. Its rod body has a uniform diameter and possesses good mechanical strength and insulation performance. A closing guide groove is fixedly installed at one end of the insulating rod, and the housing is fixedly fitted onto the outer circumference near the closing guide groove. A slider is fitted in the middle of the housing, and the slider can slide along the axial direction of the insulating rod. Furthermore, a limit block is provided between the insulating rod and the closing guide groove, with the radius of the limit block being larger than the radius of the insulating rod, to prevent the housing from sliding.

[0008] The housing is made of aluminum alloy and has a hollow cylindrical structure. The inner wall has through holes that fit the outer circumference of the insulating rod. The inner diameter of the housing is clearance-fitted with the outer diameter of the slider, forming a guiding space to accommodate the spring and slider. The housing is fixedly sleeved onto one end of the insulating rod through the through holes, and the bottom of the inner cavity is fixedly connected to the lower end of the spring, thus limiting and guiding the axial movement of the spring and slider.

[0009] The spring is made of carbon spring steel and has a cylindrical helical spring structure. Its free length is slightly less than the depth of the inner cavity of the housing. The wire diameter and number of turns are designed according to the required reset force. Under normal conditions, the spring is in an extended state, and it undergoes linear elastic deformation when compressed. The spring is located in the inner cavity of the housing, with its lower end welded or snapped to the closed bottom of the housing, and its upper end fixedly connected to the center of the lower end face of the slider. The spring drives the slider to reset through telescopic movement.

[0010] The slider is made of aluminum alloy and has a stepped cylindrical structure. It has a central through hole that slides within the outer circumference of the insulating rod. The lower section's outer circumference is clearance-fitted with the inner cavity of the housing. The upper end face has a connecting boss for mounting a guide plate. The slider is fitted onto the insulating rod through the central through hole and located within the housing cavity. The lower end face of the lower section connects to the upper end of the spring, and the upper connecting boss is rigidly connected to the lower end face of the guide plate. It can slide along the axial direction of the insulating rod and drive the guide plate to move synchronously.

[0011] The guide plate is made of fiberglass and has a long, narrow plate structure. Its length is slightly greater than the height of the knife switch clamp, its width matches the gap between the knife switch clamps, and its thickness is uniform to ensure structural strength. The lower end of the guide plate has mounting holes that mate with the connecting boss of the slider, and the upper end has symmetrical roller mounting grooves on both sides. The guide plate is fixed to the connecting boss of the slider through the lower mounting holes, is perpendicular to the upper surface of the slider, and extends into the gap of the knife switch clamp as the slider moves axially, guiding the movement trajectory of the moving contact. The upper end of the guide plate passes through the housing and is located outside the housing.

[0012] The roller is a bearing assembly, including an outer ring, an inner ring, and rolling elements. The diameter of the outer ring is adapted to the contact surface at the top of the stationary contact. The inner ring is connected to the guide plate via a rotating shaft, and the entire assembly can rotate freely around the shaft. There are two rollers in total, symmetrically mounted in roller mounting slots at the upper end of the guide plate via a rotating shaft. Both ends of the rotating shaft are fixed to the guide plate. The outer circumferential surface of the roller is used to contact the top of the stationary contact to achieve limiting and friction reduction.

[0013] The closing guide groove is made of aluminum alloy and has a U-shaped groove structure. The groove width is adapted to the diameter of the bolt at the top of the knife switch, and the groove depth is greater than the height of the bolt head. The bottom of the groove is fixedly connected to the top of the insulating rod. The bottom of the closing guide groove is fixed to the top of the insulating rod by welding or bolting. The U-shaped groove is set upwards to accommodate the bolt at the top of the knife switch and to transmit the closing thrust.

[0014] Specifically, this utility model improves the overall performance of the tool through the following innovative designs: In the U-shaped opening design of the closing guide groove, the groove width matches the diameter of the knife switch bolt, and the groove wall has a smooth transition, ensuring quick alignment and bolt engagement, and preventing bolt slippage during operation; the narrow plate-like structure of the guide plate precisely matches the gap between the knife switch clamping plate, with a flatness error controlled within 0.5mm, correcting offsets caused by initial alignment deviations; in the clearance fit design between the slider and the housing, the gap between the lower outer circumference of the slider and the inner cavity of the housing is controlled within 0.2mm, and the center... The gap between the through hole and the insulating rod is controlled within 0.1mm to form a double guide and avoid radial swaying when the slider moves. In the symmetrical installation and rotation design of the roller, the outer circumference of the roller is an arc-shaped curved surface, which forms a line contact when it contacts the top plane of the stationary contact. The outer circumference of the roller is coated with polytetrafluoroethylene to reduce the coefficient of friction. At the same time, mechanical limiting is achieved through rigid contact with the stationary contact. In the pre-extension state design of the spring, the spring is in the extended state under normal conditions to ensure that the initial position of the slider is located in the upper part of the inner cavity of the housing. After it reaches the position, the spring resets and drives the slider and guide plate to retract.

[0015] Furthermore, the working principle of this utility model is as follows: S1, in the initial state, the spring is in an extended state, the slider is located at the upper end inside the housing, and the guide plate and roller are in a low position; S2, in the alignment stage, the opening of the closing guide groove is aligned with the bolt at the top of the knife switch, inserted between the knife switch clamping plates, and the tool is pushed upward so that the roller at the top of the guide plate presses against the top of the stationary contact; S3, in the closing stage, the insulating rod is pushed forcefully, the slider compresses the spring and drives the guide plate to move upward, the closing guide groove applies an upward thrust through the bolt, and at the same time the guide plate slides along the surface of the stationary contact through the roller, guiding the moving contact to move along the correct path to complete the correct closing; S4, in the limit protection stage, the contact limit between the roller and the stationary contact prevents excessive pushing and avoids rigid collision between the moving contact and the stationary contact.

[0016] The technical advantages of this invention are as follows: The guiding action of the guide plate and rollers automatically corrects the movement contact offset, improving closing accuracy; the closing guide groove and guide plate reduce the need for manual alignment, lowering operational intensity; the mechanical limiting of the rollers and stationary contacts prevents equipment damage caused by excessive operation; insulating materials such as the insulating rod and fiberglass guide plate ensure operational safety; and the aluminum alloy shell and carbon spring steel spring enhance structural strength and service life. In particular, this invention integrates correction and limiting functions, achieving a unified design for movement contact offset correction and active limit protection at the endpoint position; lightweight design using aluminum alloy and fiberglass materials reduces overall weight and improves operational flexibility; and modular assembly allows for independent disassembly and replacement of each component, facilitating maintenance and replacement.

[0017] In summary, this utility model, through the above-described specific structural design and functional implementation, solves the problems of difficulty in correcting moving contact offset, low operating accuracy, and lack of effective limit protection in the prior art, and has significant technical advantages and application value. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the insulating rod structure of this utility model.

[0020] Figure 3 This is a schematic diagram of the shell structure of this utility model.

[0021] Figure 4 This is a schematic diagram of the slider structure of this utility model.

[0022] Figure 5 This is a schematic diagram of the guide plate structure of this utility model.

[0023] In the above figures, the component names corresponding to the reference numerals are as follows:

[0024] 1. Insulating rod; 2. Housing; 3. Spring; 4. Slider; 5. Guide plate; 6. Roller; 7. Closing guide groove; 8. Limit block; 9. Connecting boss; 10. Mounting hole. Detailed Implementation

[0025] This utility model embodiment provides a high-voltage disconnector switch straightening and opening tool with limit protection function, the overall structure of which is as follows: Figure 1 As shown in the attached diagram. This tool consists of several key components, including an insulating rod 1, a housing 2, a spring 3, a slider 4, a guide plate 5, a roller 6, and a closing guide groove 7. Through precise design and close cooperation, these components achieve accurate guidance of the moving contact trajectory of the high-voltage disconnector and active limit protection at its endpoint. The following, in conjunction with the attached diagram... Figure 1 To be continued Figure 5 The specific embodiments of this utility model will be described in detail.

[0026] The insulating rod 1 is the core component of the entire tool. It is made of fiberglass, possessing excellent mechanical strength and insulation properties. For example... Figure 2As shown, the insulating rod 1 is a slender rod-shaped structure, the length of which can be set according to actual operational needs. The rod body has a uniform diameter and a smooth surface, making it easy for operators to grip and push. A closing guide groove 7 is fixedly installed at one end of the insulating rod 1, and a housing 2 is fitted on the outer circumference of the end near the closing guide groove 7, with a slider 4 fitted in the middle. The slider 4 slides with the insulating rod 1 through a central through hole and can move along the axial direction of the rod body. To prevent the slider 4 from sliding excessively, a limit block 8 is provided between the insulating rod 1 and the closing guide groove 7. The radius of the limit block 8 is larger than the radius of the insulating rod 1, and the limit block 8 is fixed at the end of the insulating rod 1 near the closing guide groove 7 to limit the housing 2.

[0027] The structure of shell 2 is as follows Figure 3 As shown, the housing 2 is made of aluminum alloy and has a hollow cylindrical design. The inner wall has through holes that fit the outer circumference of the insulating rod 1. The inner diameter of the housing 2 is clearance-fitted with the outer diameter of the slider 4, forming a guide space to accommodate the spring 3 and the slider 4. The housing 2 is fixedly sleeved onto one end of the insulating rod 1 through the through holes, and the bottom of the inner cavity is fixedly connected to the lower end of the spring 3, ensuring stable axial movement of the spring 3 and the slider 4 without deviation. The design of the housing 2 not only provides structural support but also enhances the overall stability of the tool by limiting the movement of the slider 4 and the spring 3.

[0028] The structure of spring 3 is as follows Figure 1 As shown, the spring 3 is made of carbon spring steel and is in the form of a cylindrical helical spring. The free length of the spring 3 is slightly less than the depth of the inner cavity of the housing 2, and the wire diameter and number of turns are designed according to the required reset force. Under normal conditions, the spring 3 is in an extended state, and it will produce linear elastic deformation when compressed. The spring 3 is located in the inner cavity of the housing 2, with its lower end welded or snapped to the closed bottom of the housing 2, and its upper end fixedly connected to the center of the lower end face of the slider 4. Through the extension and retraction of the spring 3, the slider 4 can achieve the reset function, thereby driving the guide plate 5 to retract. This design ensures that the tool can automatically return to the initial state after completing the closing operation, avoiding being stuck on the disconnect switch.

[0029] The structure of slider 4 is as follows Figure 4 As shown, the slider 4 is made of aluminum alloy and has a stepped cylindrical design. A central through-hole is provided at the center of the slider 4, which slides smoothly on the outer circumference of the insulating rod 1. The diameter of the through-hole is clearance-fitted with the outer diameter of the insulating rod 1, ensuring smooth sliding of the slider 4 on the insulating rod 1. The lower outer circumference of the slider 4 is clearance-fitted with the inner cavity of the housing 2, with the clearance controlled within 0.2mm to reduce radial wobble. A connecting boss 9 for mounting the guide plate 5 is provided on the upper end face of the slider 4. The connecting boss 9 is fixed to the mounting hole 10 of the guide plate 5 by bolts, thus achieving a rigid connection between the slider 4 and the guide plate 5. The design of the slider 4 not only ensures the axial movement stability of the guide plate 5 but also achieves a reset function through cooperation with the spring 3.

[0030] The structure of guide plate 5 is as follows Figure 5 As shown, the guide plate 5 is made of fiberglass and has a narrow, elongated plate design. The length of the guide plate 5 is slightly greater than the height of the knife switch clamp, its width matches the gap between the knife switch clamps, and its thickness is uniform to ensure structural strength. The flatness error of the guide plate 5 is controlled within 0.5mm to ensure smooth sliding within the gap of the knife switch clamps. The lower end of the guide plate 5 has mounting holes 10 that match the connecting boss 9 of the slider 4, and symmetrical roller mounting grooves are opened on both sides of the upper end. Rollers 6 are symmetrically mounted in the roller mounting grooves at the upper end of the guide plate 5 via rotating shafts, with both ends of the rotating shafts fixedly connected to the guide plate 5. Specifically, symmetrical roller mounting grooves with a depth of 10mm and a width of 8mm are opened on both sides of the upper end of the guide plate 5; the roller mounting grooves are located 20mm below the top of the guide plate. The outer circumferential surface of the roller 6 is an arc-shaped curved surface, forming line contact when in contact with the top plane of the stationary contact. The outer circumferential surface of the roller is coated with polytetrafluoroethylene to reduce the coefficient of friction, thereby effectively reducing frictional resistance. Meanwhile, roller 6 achieves mechanical limiting through rigid contact with the stationary contact, preventing further advancement after the circuit is closed, and the limit stroke error is controlled within 0.5mm.

[0031] The structure of the closing guide groove 7 is as follows Figure 2 As shown, it is made of aluminum alloy and features a U-shaped groove design. The width of the closing guide groove 7 matches the diameter of the bolt at the top of the disconnect switch, and the groove depth is greater than the height of the bolt head. The bottom of the groove is fixedly connected to the top of the insulating rod 1. The groove opening of the closing guide groove 7 is designed with a smooth transition, facilitating quick alignment and bolt engagement, and preventing bolt slippage during operation. The closing guide groove 7 is fixed to the top of the insulating rod 1 by welding or bolting, with the U-shaped groove facing upwards, used to accommodate the bolt at the top of the disconnect switch and transmit the closing thrust. The design of the closing guide groove 7 significantly improves the operating accuracy of the tool and solves the problem of inaccurate alignment in traditional tools.

[0032] The working principle of this utility model is as follows: S1, in the initial state, the spring 3 is in the extended state, the slider 4 is located at the upper end inside the housing 2, and the guide plate 5 and roller 6 are in the low position; S2, in the alignment stage, the operator aligns the opening of the closing guide groove 7 with the top bolt of the knife switch, inserts the tool along the gap of the knife switch clamp, and pushes the tool upward so that the roller 6 at the top of the guide plate 5 presses against the top of the stationary contact to ensure limit contact; S3, in the closing stage, the operator pushes the insulating rod 1 forcefully, the slider 4 compresses the spring 3 and drives the guide plate 5 to move upward, the closing guide groove 7 applies an upward thrust through the bolt, and at the same time the guide plate 5 slides along the surface of the stationary contact through the roller 6, guiding the moving contact to move along the correct path to complete the correct closing; S4, in the limit protection stage, the contact limit between the roller 6 and the stationary contact prevents excessive pushing and avoids rigid collision between the moving contact and the stationary contact, thus playing a protective role.

[0033] In practical applications, the operation steps of this utility model are as follows: In the preparation stage, the operator needs to check whether the connections of each component of the tool are normal, ensuring that the spring 3 is in the extended state; in the alignment stage, the operator aligns the opening of the closing guide groove 7 with the bolt at the top of the knife switch and inserts the tool along the gap in the knife switch clamping plate; in the tightening stage, the operator pushes the tool upwards, causing the roller 6 at the top of the guide plate 5 to press against the top of the stationary contact, ensuring limit contact; in the closing stage, the operator axially pushes the insulating rod 1, causing the knife switch to move upwards through the closing guide groove 7, while the guide plate 5 guides the moving contact to correct its offset, and the spring 3 returns to its original position after closing. The above operation steps are simple and easy to perform, significantly reducing the difficulty and labor intensity of operation.

[0034] The innovation of this utility model lies in its integration of correction and limiting functions. The guide plate 5 and roller 6 work together to both correct the misalignment of the moving contact and achieve mechanical limiting, solving the problem of difficult moving contact misalignment correction in existing technologies. The lightweight design uses aluminum alloy and fiberglass materials, reducing overall weight and improving operational flexibility. The modular assembly design allows for independent disassembly and assembly of each component, facilitating maintenance and replacement. Furthermore, this utility model further enhances the overall performance of the tool through the U-shaped opening design of the closing guide groove 7, the elongated plate structure of the guide plate 5, the clearance fit design between the slider 4 and the housing 2, the symmetrical installation and rotation design of the roller 6, and the pre-extension design of the spring 3.

[0035] In summary, this utility model, through the above-described specific structural design and functional implementation, solves the problems of difficulty in correcting moving contact offset, low operating accuracy, and lack of effective limit protection in the prior art, and has significant technical advantages and application value.

[0036] The above description is merely one embodiment of this utility model and is not intended to limit this utility model in any way. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of this utility model's technical solution. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model without departing from the scope of this utility model's technical solution shall still fall within the scope of this utility model's technical solution.

Claims

1. A high-voltage disconnector switch straightening and closing tool with limit protection function, characterized in that, include: Insulating rod (1); The housing (2) is sleeved on the insulating rod (1). The housing (2) is a hollow cylindrical structure with an inner cavity inside. The slider (4) is sleeved on the insulating rod (1) and disposed inside the cavity of the housing (2). The slider (4) can slide along the axial direction of the insulating rod (1). A spring (3) is disposed inside the housing (2), with one end connected to the slider (4) and the other end fixedly connected to the housing (2); The guide plate (5) is connected to the slider (4) at one end and passes through the housing (2) at the other end and is located outside the housing (2), and is provided with a roller (6). The closing guide groove (7) is fixed to one end of the insulating rod (1).

2. The high-voltage disconnector correction and opening tool with limit protection function according to claim 1, characterized in that, The closing guide groove (7) is fixedly installed at one end of the insulating rod (1); a limiting block (8) is provided between the insulating rod (1) and the closing guide groove (7), and the radius of the limiting block (8) is greater than the radius of the insulating rod (1).

3. The high-voltage disconnector correction and opening tool with limit protection function according to claim 1, characterized in that, The inner wall of the housing (2) is provided with a through hole that is adapted to the outer circumferential surface of the insulating rod (1); the inner diameter of the housing (2) is clearance-fitted with the outer diameter of the slider (4), and is fixedly sleeved on the insulating rod (1) through the through hole; the bottom of the inner cavity is fixedly connected to the lower end of the spring (3).

4. The high-voltage disconnector correction and opening tool with limit protection function according to claim 1, characterized in that, The spring (3) is a cylindrical helical spring (3) structure. The lower end of the spring (3) is fixedly connected to the bottom of the housing (2), and the upper end is connected to the center of the lower end face of the slider (4). The spring (3) is in an extended state under normal conditions.

5. The high-voltage disconnector correction and opening tool with limit protection function according to claim 1, characterized in that, The slider (4) has a stepped cylindrical structure and a central through hole that slides with the outer circumferential surface of the insulating rod (1). The end face of the slider (4) is provided with a connecting boss (9) for installing the guide plate (5). The lower end of the guide plate (5) is provided with a mounting hole (10) that matches the connecting boss (9), and the upper end is provided with roller (6) mounting grooves on both sides.

6. The high-voltage disconnector correction and opening tool with limit protection function according to claim 5, characterized in that, The guide plate (5) has a long and narrow plate structure, its length is greater than the height of the knife switch clamp, and its width matches the gap between the knife switch clamp.

7. The high-voltage disconnector correction and opening tool with limit protection function according to claim 6, characterized in that, The roller (6) is a bearing assembly, there are two in total, and they are symmetrically installed in the roller (6) mounting groove at the upper end of the guide plate (5) through the rotating shaft; the outer peripheral surface of the roller (6) is an arc-shaped curved surface, which forms a line contact when it contacts the top plane of the stationary contact.

8. The high-voltage disconnector correction and opening tool with limit protection function according to claim 1, characterized in that, The closing guide groove (7) has a U-shaped groove structure. The groove width is adapted to the diameter of the bolt at the top of the knife switch. The groove wall has a smooth transition. The groove depth is greater than the height of the bolt head. The bottom of the groove is fixedly connected to the top of the insulating rod (1).

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