Isolating switch with buffer protection structure and method of use thereof

Abstract

The application discloses an isolating switch with a buffer protection structure and a use method thereof. The application has the beneficial effects that: by installing the clamping component on the lever, cooperating with the arc-shaped slot, the limiting hole and the bilateral buffer component on the body of the isolating switch, the rotation full-range guidance of the lever, the non-jamming sliding limiting are realized, the problems of the traditional rotating isolating switch, such as misalignment, operation jamming and fouling failure of the sliding part, are completely solved; meanwhile, through the design of the bidirectional buffer structure, the flexible deceleration energy absorption can be realized when the lever rotates to the limit position, the end rotation speed of the lever and the shutter is effectively reduced, the deformation of the parts and the contact ablation damage caused by the rigid impact are avoided; meanwhile, the reverse thrust force can be continuously provided after the compression of the buffer spring, the friction force between the sliding rod and the limiting hole is increased, the elastic clamping and the double anti-loose structure of auxiliary jacking are formed, and the problems of the lever and the shutter loosening and deviation caused by the equipment vibration are effectively eliminated.

Description

Technical Field

[0001] This invention relates to the field of disconnecting switch technology, and in particular to a disconnecting switch with a buffer protection structure and its usage method. Background Technology

[0002] Rotary disconnect switches are important isolation and protection devices in power distribution systems. They mainly use a lever to drive the internal knife switch to rotate, thereby achieving circuit connection and disconnection isolation. The lever limit structure ensures the stable locking of the knife switch at the open and closed limit positions. It is a core component to ensure the safety of power distribution equipment maintenance and the stable operation of circuits.

[0003] Currently, traditional rotary disconnect switches on the market mostly use rigid snap-fit, single bolt locking, or simple hole-position locking structures for their lever limiting structures. Furthermore, the buffering, limiting, and guiding structures are independent, resulting in low overall structural integration. In actual operation, traditional levers lack a flexible buffer structure when rotated to the correct position, making the lever prone to rigid impact with the switch body. This not only leads to excessively high rotation speeds at the end of the lever and the switch blade, causing contact deformation and arc erosion, affecting the conductivity and insulation safety of the disconnect switch, but also subjectes the equipment to long-term impact vibration, causing problems such as loosening and wear aging of components. Simultaneously, traditional disconnect switches lack a dedicated guiding structure for lever rotation, requiring manual intervention. The traditional sliding contact structure is difficult to align during operation, and the sliding contact is prone to jamming and other issues. In addition, the conventional sliding contact structure lacks dust protection design, and dust, water vapor, and oil in the power distribution room and outdoor working conditions can easily accumulate at the sliding contact position, leading to sliding resistance and jamming failure. Furthermore, the traditional limit structure relies on a single snap-fit ​​to achieve limit fixation without an auxiliary tightening and anti-loosening structure. Under long-term vibration during equipment operation, the lever is prone to loosening and displacement, which can lead to safety hazards such as internal switch position displacement, poor contact, and substandard isolation break. This significantly reduces the operational reliability and service life of the disconnect switch and cannot meet the long-term stable, high-safety, and low-loss requirements of high and low voltage power distribution equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a disconnecting switch with a buffer protection structure and its usage method in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: A disconnecting switch with a buffer protection structure includes a disconnecting switch body. A lever is rotatably mounted on the middle of one side wall of the disconnecting switch body, and the lever is fixedly connected to a knife switch inside the disconnecting switch body. Limit holes are provided on the disconnecting switch body corresponding to the two extreme positions of the lever (open and closed), and an arc-shaped groove is provided between the two limit holes. A locking assembly is mounted on the lever, the locking assembly including a slide rod, a pull head, a push spring, a ball bearing, a sliding hole, and an annular dust cover. The slide rod is vertically mounted on the lever, the pull head is fixed to the exposed end of the slide rod, the push spring is sleeved on the outside of the slide rod, and both ends of the push spring abut against the pull head and the lever, respectively. The ball bearing is fixed to the... The sliding rod faces one end of the disconnect switch body, and the disconnect switch body rolls with the arc-shaped groove. The sliding hole is opened on the lever and mates with the sliding rod. The dust cover is fitted on the outside of the ball bearing. A buffer assembly is installed on one side of each limiting hole on the disconnect switch body. The buffer assembly includes a support plate, a slider, a high-elasticity wear-resistant composite buffer pad, a sliding groove, and a buffer spring. The support plate has an inverted L-shaped structure and is fixed to the side wall of the disconnect switch body. The sliding groove is opened on the inner side of the support plate. The slider is slidably mounted on one side of the sliding groove. The high-elasticity wear-resistant composite buffer pad is fixed on the side of the slider facing the lever. The buffer spring is mounted between the slider and the inner wall of the inverted L-shaped support plate.

[0006] By adopting the above technical solution, the device, relying on the coordinated cooperation of the locking component and the bidirectional buffer component, constructs an integrated protective limiting structure that combines precise guidance, sealing protection, flexible buffering, and elastic anti-loosening. The rigid connection between the lever and the switch ensures that their rotational movements are completely synchronized, avoiding opening and closing deviations caused by transmission gaps. The interconnected structure of the arc-shaped groove and the double limiting holes provides a precise motion reference for the lever's rotation locking. Combined with the elastic locking component with the ball bearings, the lever can achieve full-range rolling sliding guidance, completely eliminating... It overcomes the defects of traditional sliding friction structures such as jamming and sticking; at the same time, the annular dust cover can fully cover the mating parts of the ball and the arc groove, preventing dust, water vapor and oil from entering the sliding mating gap, solving the problem of dirt accumulation, corrosion and jamming failure of the mating structure in outdoor and complex industrial and mining conditions; the matching bidirectional buffer component can realize flexible energy absorption and buffering when the lever is in the opening and closing position, avoiding rigid impact damage, and at the same time, it uses the elastic tightening characteristics of the spring to form a double anti-loosening limit structure, improving the operating accuracy, operation stability and service life of the disconnecting switch body from the structural source.

[0007] Furthermore, the slide groove has a T-shaped structure, the slider slides in conjunction with the slide groove, and the sliding stroke of the slider is adapted to the limit rotational displacement of the lever.

[0008] By adopting the above technical solution, the slide groove of the T-shaped structure has excellent limiting and guiding performance, which can form a two-way limiting constraint on the slider in both the lateral and vertical directions. This effectively avoids problems such as displacement, derailment, and jamming of the slider during reciprocating sliding, ensuring that the slider always slides smoothly along the axial direction of the slide groove, and improving the stability and consistency of the buffering action. At the same time, the precise matching design between the slider sliding stroke and the limit rotational displacement of the lever ensures that the lever is precisely triggered to buffer the slider when it is about to reach the limit position of opening or closing. This avoids the problem of premature buffering affecting the normal operating stroke of the lever, as well as the problem of delayed buffering failing to effectively offset the impact force. It precisely adapts to the rotational motion law of the lever, maximizes the buffering energy absorption effect, and ensures that the buffering protection effect of each opening and closing operation is uniform and controllable.

[0009] Furthermore, the high-elasticity wear-resistant composite buffer pad is made of nylon pad and rubber pad bonded together, and the outer side wall of the high-elasticity wear-resistant composite buffer pad is provided with a fitting surface that is adapted to the side wall of the lever.

[0010] By adopting the above technical solution, a composite bonding structure of nylon and rubber pads is used, which takes into account the core advantages of both materials and breaks through the performance limitations of a single buffer material. The rubber pad has excellent high elasticity and shock absorption performance, which can be quickly compressed and deformed when the lever is impacted, effectively absorbing the impact kinetic energy of the lever and the end of the switch, realizing flexible deceleration and eliminating the problems of component deformation and contact burning caused by rigid impact. The nylon pad has high strength, high wear resistance, anti-aging and oil resistance, and can be used as the outer contact layer to withstand repeated impact and friction, which greatly improves the service life of the buffer pad and avoids the problems of wear and cracking and buffer failure caused by long-term repeated use.

[0011] Furthermore, one end of the buffer spring is inserted and fixed to the slider, and the other end of the buffer spring is inserted and fixed to the support plate.

[0012] By adopting the above technical solution, the buffer spring is fixed by plugging at both ends, replacing the traditional simple assembly structure of fitting and abutting. This allows for precise positioning and installation of the buffer spring, effectively preventing it from shifting, slipping, or tilting during repeated compression and rebound. It also avoids uneven force on the buffer spring, which can lead to elastic decay and fatigue failure. This fixing method ensures that the buffer spring always extends and retracts precisely along the axial direction, with uniform and stable force. It can stably compress and store impact energy when the lever strikes, achieving flexible deceleration and energy absorption, and stably rebound and reset after buffering, continuously providing a reverse pushing force to the slider, ensuring the buffer structure can work stably and cyclically. At the same time, the plugging structure is simple to assemble and easy to disassemble, facilitating later equipment maintenance and parts replacement, effectively reducing the difficulty and cost of equipment operation and maintenance.

[0013] Furthermore, the support plate is bolted to the side wall of the disconnect switch body, and the gap between the support plate and the disconnect switch body is greater than the thickness of the lever.

[0014] By adopting the above technical solution, the gap between the support plate and the disconnect switch body is greater than the thickness of the lever, which completely avoids the side wall friction and scratching between the lever and the support plate during rotation, eliminates rotational interference resistance, ensures smooth and uninterrupted rotation of the lever, and provides sufficient margin for the rotational deformation of the lever and thermal expansion and contraction under working conditions, avoiding malfunctions such as jamming and abnormal noise during equipment operation, and further improving the smoothness and stability of equipment operation.

[0015] Furthermore, the curvature of the arc-shaped groove matches the rotation trajectory of the lever, the outer diameter of the dust cover is larger than the width of the arc-shaped groove opening, and the annular dust cover completely covers the opening of the arc-shaped groove.

[0016] By adopting the above technical solution, the curvature of the arc groove is precisely matched with the rotation trajectory of the lever, allowing the ball bearing to always adhere to the inner wall of the arc groove and roll smoothly during the rotation of the lever. This achieves high-precision guidance throughout the rotation of the lever, ensuring complete synchronization between the rotation trajectory of the lever and the internal switch, and completely solving the problems of inaccurate alignment and positional deviation in traditional disconnecting switches, thus significantly improving the positional accuracy of opening and closing. Simultaneously, the outer diameter of the dust cover is larger than the width of the arc groove opening, enabling full-coverage sealing protection of the arc groove opening without any blind spots. This comprehensively prevents external dust, rainwater, water vapor, industrial oil, and other impurities from entering the gap between the arc groove and the ball bearing, effectively avoiding dirt accumulation, corrosion, jamming, and failure of the mating structure. This significantly improves the environmental adaptability of the equipment in complex and harsh working conditions such as outdoor environments, chemical plants, and mines, ensuring the long-term stable operation of the sliding locking structure.

[0017] Furthermore, the slide rod slides into the slide hole, and the push spring is normally in a slightly compressed structure.

[0018] By adopting the above technical solution, the high-precision sliding fit between the slide rod and the slide hole ensures smooth and stable extension and retraction of the slide rod without jamming or deviation, providing a precise motion basis for the elastic locking function. The push spring adopts a normal micro-compression assembly structure, which ensures that the push spring always maintains its initial tension when no external force is applied, and can continuously push the slide rod to the side of the limiting hole without manual adjustment. When the lever rotates to the limit position of opening and closing, the slide rod can quickly embed into the limiting hole to achieve automatic locking, simplifying manual operation steps and improving operation convenience. At the same time, the normal micro-compression pre-tightening structure can eliminate the fit gap between the slide rod and the slide hole and the limiting hole, effectively avoiding problems such as slide rod loosening, lever deviation, and switch displacement caused by equipment operation vibration, and stably ensuring that the disconnecting switch pump body is in place for opening and closing, improving the safety of circuit conduction and isolation.

[0019] Furthermore, the ball bearing rolls in conjunction with the slide bar, and the size of the slide bar matches the size of the limiting hole.

[0020] By adopting the above technical solution, the ball and the slide rod adopt a rolling fit structure, which converts the traditional sliding friction into rolling friction, greatly reducing the frictional resistance during the rotation of the lever, making the lever operation more convenient and smooth, and completely solving the defects of jamming and laborious operation of traditional disconnect switch. At the same time, it reduces frictional wear and extends the service life of the locking component. The size of the slide rod is precisely matched with the limiting hole, which can ensure that the slide rod fits tightly and locks securely after being embedded in the limiting hole, without any wobbling gap. It can accurately lock the opening and closing positions of the lever and the switch knife, avoiding positional deviation caused by equipment vibration, and ensuring the stability and reliability of the locking structure. It can also eliminate the circuit safety hazards caused by incomplete opening and closing, and greatly improve the safety factor of equipment operation.

[0021] Furthermore, the two limiting holes are symmetrically arranged at both ends of the arc-shaped groove, and the limiting holes are smoothly connected to the arc-shaped groove.

[0022] By adopting the above technical solution, the two limit holes corresponding to the opening and closing of the circuit breaker are symmetrically arranged, which can make the movement trajectory and locking stroke of the lever during the opening and closing operations consistent. The operation of the equipment is uniform and regular, which facilitates standardized operation by the staff and reduces human operation error. The limit hole and the arc groove adopt a smooth and connected transition structure without steps or dead angles, which can ensure that the ball and the slide rod can smoothly slide into the limit hole from the arc groove, realizing a seamless connection between rotation guidance and locking, and avoiding the occurrence of jamming or incomplete locking at the transition part.

[0023] The beneficial effects of this invention are as follows: This invention achieves full-range guidance and smooth sliding limit of the lever rotation by incorporating an elastic locking component with ball bearings and an annular dust cover on the lever, in conjunction with the arc groove, limit hole, and double-sided buffer components on the disconnector body. This completely solves the problems of inaccurate positioning, operational jamming, and dirt accumulation and failure of sliding parts in traditional rotary disconnectors. Furthermore, the cooperation of the arc groove and ball bearings ensures precise synchronization of the lever's rotation trajectory with the internal switch blade, improving the accuracy of the opening and closing positions. The annular dust cover effectively isolates external dust, moisture, and oil, protecting the sliding structure and significantly improving the adaptability and operational stability of the equipment under complex working conditions. At the same time, the push spring enables the lever to automatically reset and lock in position, simplifying the manual operation process and improving operational convenience. This invention utilizes a bidirectional buffer structure comprised of a slider, a buffer spring, a sliding groove, a high-elasticity wear-resistant composite buffer pad, and an inverted L-shaped support plate. This structure achieves flexible deceleration and energy absorption when the lever rotates to its limit position, effectively reducing the end rotation speed of the lever and the switch, and preventing component deformation and contact burning damage caused by rigid impact. Simultaneously, the compressed buffer spring continuously provides a reverse pushing force, increasing the contact friction between the slider and the limiting hole, forming a dual anti-loosening structure of elastic locking and auxiliary tightening. This effectively prevents the lever and switch from loosening or shifting due to equipment vibration, stably ensuring the disconnecting switch body is properly positioned, improving the safety of circuit isolation and conduction, significantly extending the overall service life of the equipment, and reducing maintenance costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an isolating switch with a buffer protection structure according to the present invention; Figure 2 This is a right sectional view of an isolating switch with a buffer protection structure according to the present invention; Figure 3 This is a rear view of the buffer assembly in an isolating switch with a buffer protection structure according to the present invention; Figure 4 This invention relates to an isolating switch with a buffer protection structure. Figure 2 Enlarged view of point A in the middle.

[0025] The annotations in the attached figures are explained as follows: 1. Disconnect switch body; 2. Limiting hole; 3. Arc groove; 4. Toggle lever; 5. Buffer assembly; 501. Buffer spring; 502. Slide groove; 503. Support plate; 504. Slider; 55. High-elasticity wear-resistant composite buffer pad; 6. Locking assembly; 601. Pull head; 602. Push spring; 603. Slide rod; 604. Slide hole; 605. Dust cover; 606. Ball bearing. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-4 As shown, a disconnecting switch with a buffer protection structure includes a disconnecting switch body 1. A lever 4 is rotatably mounted on the middle of the outer side wall of the disconnecting switch body 1, and the lever 4 is fixedly connected to the knife switch inside the disconnecting switch body 1. Limiting holes 2 are provided on the disconnecting switch body 1 corresponding to the two extreme positions of the lever 4 (open and closed), and an arc-shaped groove 3 is provided between the two limiting holes 2. A locking assembly 6 is assembled on the lever 4. The locking assembly 6 includes a sliding rod 603, a pull head 601, a push spring 602, a ball bearing 606, a sliding hole 604, and an annular dust cover 605. The sliding rod 603 is vertically mounted on the lever 4, the pull head 601 is fixed to the exposed end of the sliding rod 603, and the push spring 602 is sleeved on the lever 4. Located on the outside of the slide bar 603, the push spring 602 abuts against the pull head 601 and the lever 4 at both ends. The ball bearing 606 is fixed to the end of the slide bar 603 facing the disconnector body 1, and the disconnector body 1 rolls with the arc groove 3. The sliding hole 604 is opened on the lever 4 at the part that mates with the slide bar 603. The dust cover 605 is fitted on the outside of the ball bearing 606. A buffer assembly 5 is installed on one side of each limit hole 2 on the disconnector body 1. The buffer assembly 5 includes a support plate 503, a slider 504, a high-elasticity wear-resistant composite buffer pad 55, a sliding groove 502, and a buffer spring 501. The support plate 503 has an inverted L-shaped structure and is fixed to the side wall of the disconnector body 1. The sliding groove 502 is opened... Located inside the support plate 503, the slider 504 is slidably mounted on one side of the slide groove 502. A high-elasticity, wear-resistant composite buffer pad 55 is fixed to the side of the slider 504 facing the lever 4. A buffer spring 501 is mounted between the slider 504 and the inner wall of the inverted L-shaped support plate 503. The device, relying on the coordinated cooperation of the locking assembly 6 and the bidirectional buffer assembly 5, constructs an integrated protective limiting structure that combines precise guidance, sealing protection, flexible buffering, and elastic anti-loosening. The rigid connection between the lever 4 and the knife switch ensures complete synchronization of their rotational movements, avoiding opening and closing deviations caused by transmission gaps. The connecting structure between the arc-shaped groove 3 and the double limiting hole 2 provides a precise motion reference for the rotation locking of the lever 4, combined with a roller... The elastic locking component 6 of ball 606 enables the lever 4 to slide and roll throughout its entire range, completely eliminating the defects of jamming and sticking in traditional sliding friction structures. At the same time, the annular dust cover 605 can fully wrap the mating parts of ball 606 and arc groove 3, preventing dust, water vapor, and oil from entering the sliding mating gap, solving the problems of dirt accumulation, corrosion, and jamming failure in the mating structure under complex outdoor and industrial conditions. The matching bidirectional buffer component 5 can achieve flexible energy absorption and buffering at the moment the lever 4 is in the opening and closing position, avoiding rigid impact damage. At the same time, the elastic tightening characteristics of the buffer spring 501 form a double anti-loosening limit structure, improving the operating accuracy, operational stability and service life of the disconnect switch body 1 from the structural source.

[0027] In this embodiment, the slide groove 502 has a T-shaped structure, and the slider 504 slides in conjunction with the slide groove 502. The sliding stroke of the slider 504 is adapted to the limit rotational displacement of the lever 4. The T-shaped slide groove 502 has excellent limiting and guiding performance, which can form a two-way limiting constraint on the slider 504 in the lateral and vertical directions. This effectively avoids problems such as offset, derailment, and jamming of the slider 504 during the reciprocating sliding process, ensuring that the slider 504 always slides smoothly along the axial direction of the slide groove 502, thus improving the stability and consistency of the buffering action. At the same time, the precise matching design between the sliding stroke of the slider 504 and the limit rotational displacement of the lever 4 ensures that the lever 4 is about to reach the opening or closing limit position when the slider 504 is precisely triggered to buffer the action. This avoids the problem of premature buffering affecting the normal operating stroke of the lever 4, as well as the problem of delayed buffering that cannot effectively offset the impact force. It precisely adapts to the rotational motion law of the lever 4, maximizes the buffering energy absorption effect, and ensures that the buffering protection effect of each opening and closing operation is uniform and controllable.

[0028] In this embodiment, the high-elasticity wear-resistant composite buffer pad 55 is made of a nylon pad and a rubber pad bonded together. The outer wall of the high-elasticity wear-resistant composite buffer pad 55 is provided with a fitting surface that is adapted to the side wall of the lever 4. The structure of the nylon pad and the rubber pad bonded together takes into account the core advantages of the two materials and breaks through the performance limitations of a single buffer material. The rubber pad has excellent high elasticity and shock absorption buffer performance, and can quickly compress and deform when the lever 4 is impacted, effectively absorbing the impact kinetic energy of the lever 4 and the end of the switch, realizing flexible deceleration and eliminating the problems of component deformation and contact burning caused by rigid impact. The nylon pad has the characteristics of high strength, high wear resistance, anti-aging and oil resistance, and can be used as the outer contact layer to withstand repeated impact friction, which greatly improves the service life of the buffer pad and avoids the problems of wear and cracking and buffer failure caused by long-term repeated use.

[0029] In this embodiment, one end of the buffer spring 501 is inserted and fixed to the slider 504, and the other end of the buffer spring 501 is inserted and fixed to the support plate 503. The two ends of the buffer spring 501 are fixed by insertion, which replaces the simple assembly structure of traditional contact. This can achieve precise positioning and installation of the buffer spring 501, effectively preventing the buffer spring 501 from shifting, slipping, or tilting during repeated compression and rebound. It also avoids uneven force on the buffer spring 501, which can lead to elastic decay and fatigue failure. This fixing method can ensure that the buffer spring 501 always extends and contracts precisely along the axial direction, and the force is uniform and stable. It can stably compress and store impact energy when the lever 4 hits, achieving flexible deceleration and energy absorption. It can also stably rebound and reset after buffering, continuously providing reverse thrust to the slider 504, ensuring that the buffer structure can work stably in cycles. At the same time, the insertion structure is simple to assemble and easy to disassemble, which facilitates later equipment maintenance and parts replacement, effectively reducing the difficulty and cost of equipment operation and maintenance.

[0030] In this embodiment, the support plate 503 is bolted to the side wall of the disconnector switch body 1. The gap between the support plate 503 and the disconnector switch body 1 is greater than the thickness of the lever 4. The limiting design that the gap between the support plate 503 and the disconnector switch body 1 is greater than the thickness of the lever 4 can completely avoid the side wall friction and scratching between the lever 4 and the support plate 503 during the rotation process, eliminate rotational interference resistance, ensure that the lever 4 rotates smoothly without jamming, and at the same time reserve sufficient margin for the rotational deformation of the lever 4 and thermal expansion and contraction under working conditions, avoid malfunctions such as jamming and abnormal noise during equipment operation, and further improve the smoothness and stability of equipment operation.

[0031] In this embodiment, the curvature of the arc-shaped groove 3 matches the rotation trajectory of the lever 4. The outer diameter of the dust cover 605 is larger than the width of the arc-shaped groove 3, and the annular dust cover 605 completely covers the opening of the arc-shaped groove 3. The precise match between the curvature of the arc-shaped groove 3 and the rotation trajectory of the lever 4 allows the ball bearing 606 to always adhere to the inner wall of the arc-shaped groove 3 and roll smoothly during the rotation of the lever 4. This achieves high-precision guidance throughout the rotation of the lever 4, ensuring that the rotation trajectory of the lever 4 and the internal switch are completely synchronized, thus completely solving the problem of inaccurate alignment when opening and closing the traditional disconnector switch. The positional deviation issue is significantly improved, enhancing the accuracy of the opening and closing positions. Simultaneously, the outer diameter of the dust cover 605 is larger than the width of the arc-shaped groove 3, enabling full-coverage sealing protection of the arc-shaped groove 3 opening without any blind spots. This effectively prevents external dust, rainwater, water vapor, industrial oil, and other impurities from entering the mating gap between the arc-shaped groove 3 and the ball bearing 606, preventing dirt accumulation, corrosion, jamming, and failure in the mating structure. This significantly improves the equipment's environmental adaptability in complex and harsh working conditions such as outdoor environments, chemical plants, and mines, ensuring the long-term stable operation of the sliding locking structure.

[0032] In this embodiment, the slide rod 603 and the slide hole 604 are in sliding engagement, and the push spring 602 is normally in a slightly compressed structure. The high-precision sliding engagement between the slide rod 603 and the slide hole 604 ensures that the extension and retraction of the slide rod 603 is smooth and stable, without jamming or deviation, providing a precise motion basis for the elastic locking function. The push spring 602 adopts a normally slightly compressed assembly structure, which ensures that the push spring 602 always maintains its initial pressing force when no external force is applied, and can continuously push the slide rod 603 without manual adjustment. The limiting hole 2 is fitted on one side; when the lever 4 is rotated to the limit position of opening and closing, the slide rod 603 can be quickly embedded in the limiting hole 2 to achieve automatic locking, simplifying manual operation steps and improving operation convenience; at the same time, the pre-tightening structure with normal micro-compression can eliminate the fitting gap between the slide rod 603 and the sliding hole 604 and the limiting hole 2, effectively avoiding the problems of slide rod 603 loosening, lever 4 offset, and switch displacement caused by equipment operation vibration, and stably ensuring that the disconnecting switch pump body is in place for opening and closing, improving the safety of circuit conduction and isolation.

[0033] In this embodiment, the ball bearing 606 and the slide rod 603 roll together, and the size of the slide rod 603 matches the size of the limiting hole 2. The ball bearing 606 and the slide rod 603 adopt a rolling engagement structure, which converts the traditional sliding friction into rolling friction, greatly reducing the frictional resistance during the rotation of the lever 4, making the operation of the lever 4 more convenient and smooth, and completely solving the defects of the traditional disconnect switch operation that is stuck and laborious. At the same time, it reduces frictional wear and extends the service life of the locking assembly 6. The precise matching of the size of the slide rod 603 with the limiting hole 2 can ensure that the slide rod 603 fits tightly and locks securely after being embedded in the limiting hole 2, without any shaking gap. It can accurately lock the opening and closing positions of the lever 4 and the switch knife, avoiding positional deviation caused by equipment vibration, and ensuring the stability and reliability of the locking structure. It can also eliminate the circuit safety hazards caused by incomplete opening and closing, and greatly improve the safety factor of equipment operation.

[0034] In this embodiment, two limiting holes 2 are symmetrically arranged at both ends of the arc-shaped groove 3, and the limiting holes 2 and the arc-shaped groove 3 are smoothly connected. The symmetrical arrangement of the two limiting holes 2 corresponding to the opening and closing of the circuit breaker ensures that the movement trajectory and locking stroke of the lever 4 during the opening and closing operations are consistent, resulting in a uniform and regular operating feel for the equipment, facilitating standardized operation by staff and reducing human error. The limiting holes 2 and the arc-shaped groove 3 adopt a smooth transition structure without steps or dead angles, which ensures that the ball 606 and the slide rod 603 can smoothly slide into the limiting hole 2 from the arc-shaped groove 3, achieving a seamless connection between rotation guidance and locking, and avoiding jamming or incomplete locking at the transition part.

[0035] A method of using a disconnecting switch with a buffer protection structure: When performing the opening and closing switching operation on the disconnecting switch body 1, the operator pulls the pull head 601 in the locking assembly 6 outwards. The pull head 601 pulls the slide rod 603 to slide axially outwards along the sliding hole 604 on the lever 4, simultaneously squeezing the push spring 602 sleeved on the outside of the slide rod 603 to further compress it. The ball bearing 606 fixed at the bottom end of the slide rod 603 simultaneously disengages from the limiting hole 2. The lever 4 loses the locking constraint between the slide rod 603 and the limiting hole 2, and obtains a margin of movement to rotate around its own rotation fulcrum. After the operator releases the pull head 601, the push spring 602, which is in a compressed state, releases its elastic thrust, pushing the slide rod 603 along the sliding hole 604. 04. As the switch retracts towards the disconnector body 1, the ball bearing 606 at the bottom of the slide rod 603 comes into contact with the groove surface of the arc-shaped groove 3. The annular dust cover 605 fitted around the ball bearing 606 simultaneously covers the opening of the arc-shaped groove 3, preventing dust, moisture, and oil from entering the rolling gap between the arc-shaped groove 3 and the ball bearing 606. Subsequently, the operator rotates the lever 4 to complete the opening and closing switching action. During the rotation of the lever 4, the ball bearing 606 always rolls along the inner wall of the arc-shaped groove 3, whose curvature matches the rotation trajectory of the lever 4. The rolling fit between the ball bearing 606 and the arc-shaped groove 3 constrains the rotation path of the lever 4, ensuring that the lever 4 and the internal switch blade rotation angle of the disconnector body 1 are completely synchronized until the lever 4 swings to the closing or opening position. The lever 4 reaches its limit position; during the process of the lever 4 reaching its limit position, the side wall of the lever 4 first contacts the high-elasticity wear-resistant composite buffer pad 55 fixed on the slider 504 inside the buffer assembly 5. The rotational thrust of the lever 4 is transmitted to the slider 504 through the high-elasticity wear-resistant composite buffer pad 55. The slider 504 slides along the groove 502 opened on the inner side of the inverted L-shaped support plate 503. During the sliding process, the slider 504 squeezes the buffer spring 501 assembled between the slider 504 and the inner wall of the support plate 503. The buffer spring 501 undergoes compression deformation to absorb the impact of the lever 4 reaching its position. The sliding stroke of the slider 504 matches the limit rotational displacement of the lever 4, providing buffer space for the lever 4. When the lever 4 moves to the limit positioning point, the push spring 6 The elastic thrust of 02 continuously drives the slide rod 603 to move towards the disconnector switch body 1. The bottom end of the slide rod 603 automatically engages with the corresponding limit hole 2, completing the basic locking and limiting of the lever 4. At this time, the buffer spring 501 remains compressed, continuously applying a pressing force towards the lever 4 to the slider 504 and the high-elasticity wear-resistant composite buffer pad 55. The high-elasticity wear-resistant composite buffer pad 55 adheres tightly to the side wall of the lever 4, forming a lateral pressure on the lever 4, increasing the contact friction between the outer wall of the slide rod 603 and the inner wall of the limit hole 2. Relying on the engagement of the slide rod 603 and the limit hole 2, and the lateral pressing of the buffer assembly 5, a double limiting structure is formed, which constrains the lever 4 from shifting or loosening, thus completing the stable locking of the disconnector switch body 1 in the open and closed positions.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A disconnecting switch with a buffer protection structure, characterized in that: The circuit includes a disconnector body (1), on which a lever (4) is rotatably mounted in the middle of one side wall. The lever (4) is fixedly connected to a knife switch inside the disconnector body (1). Limiting holes (2) are provided on the disconnector body (1) corresponding to the two extreme positions of the lever (4) for opening and closing. An arc groove (3) is provided between the two limiting holes (2). A locking assembly (6) is assembled on the lever (4). The locking assembly (6) includes a slide rod (603), a pull head (601), and a pusher. The device includes a spring (602), a ball bearing (606), a sliding hole (604), and an annular dust cover (605). The sliding rod (603) is vertically mounted on the lever (4). A pull head (601) is fixed to the exposed end of the sliding rod (603). A push spring (602) is sleeved on the outside of the sliding rod (603), with both ends of the push spring (602) abutting against the pull head (601) and the lever (4), respectively. The ball bearing (606) is fixed to the sliding rod (603) facing the isolating switch. One end of the body (1) is connected to the arc groove (3) for rolling cooperation. The sliding hole (604) is opened on the lever (4) and the sliding rod (603) for cooperation. The dust cover (605) is fitted on the outside of the ball (606). A buffer assembly (5) is installed on one side of each limiting hole (2) on the body (1) of the disconnect switch. The buffer assembly (5) includes a support plate (503), a slider (504), a high-elasticity wear-resistant composite buffer pad (55), a sliding groove (502), and a buffer spring. Spring (501), wherein the support plate (503) is an inverted L-shaped structure, and the support plate (503) is fixed to the side wall of the disconnect switch body (1), the slide groove (502) is opened on the inner side of the support plate (503), the slider (504) is slidably assembled on one side of the slide groove (502), the high elastic wear-resistant composite buffer pad (55) is fixed on the side of the slider (504) facing the lever (4), and the buffer spring (501) is assembled between the slider (504) and the inner wall of the inverted L-shaped support plate (503).

2. The disconnecting switch with a buffer protection structure according to claim 1, characterized in that: The slide groove (502) has a T-shaped structure, and the slider (504) slides in conjunction with the slide groove (502). The sliding stroke of the slider (504) is adapted to the limit rotational displacement of the lever (4).

3. The disconnecting switch with a buffer protection structure according to claim 1, characterized in that: The high-elasticity wear-resistant composite buffer pad (55) is made of nylon pad and rubber pad bonded together. The outer side wall of the high-elasticity wear-resistant composite buffer pad (55) is provided with a fitting surface that is compatible with the side wall of the lever (4).

4. A disconnecting switch with a buffer protection structure according to claim 3, characterized in that: One end of the buffer spring (501) is inserted and fixed to the slider (504), and the other end of the buffer spring (501) is inserted and fixed to the support plate (503).

5. A disconnecting switch with a buffer protection structure according to claim 4, characterized in that: The support plate (503) is bolted to the side wall of the disconnect switch body (1), and the gap between the support plate (503) and the disconnect switch body (1) is greater than the thickness of the lever (4).

6. A disconnecting switch with a buffer protection structure according to claim 1, characterized in that: The curvature of the arc groove (3) matches the rotation trajectory of the lever (4). The outer diameter of the dust cover (605) is larger than the groove width of the arc groove (3). The annular dust cover (605) completely covers the groove opening of the arc groove (3).

7. A disconnecting switch with a buffer protection structure according to claim 6, characterized in that: The slide rod (603) slides in conjunction with the slide hole (604), and the push spring (602) is normally in a slightly compressed structure.

8. A disconnecting switch with a buffer protection structure according to claim 7, characterized in that: The ball (606) rolls in cooperation with the slide bar (603), and the size of the slide bar (603) matches the size of the limiting hole (2).

9. A disconnecting switch with a buffer protection structure according to claim 1, characterized in that: The two limiting holes (2) are symmetrically arranged at both ends of the arc groove (3), and the limiting holes (2) are smoothly connected to the arc groove (3).

10. A method of using a disconnecting switch with a buffer protection structure, applied to a disconnecting switch with a buffer protection structure as described in any one of claims 1 to 9, characterized in that: When switching the disconnector switch body (1) between opening and closing, the operator pulls the pull head (601) in the locking assembly (6) outward. The pull head (601) pulls the slide rod (603) to slide outward along the sliding hole (604) on the lever (4). Simultaneously, it squeezes the push spring (602) sleeved on the outside of the slide rod (603) to further compress it. The ball (606) fixed at the bottom of the slide rod (603) simultaneously disengages from the limiting hole (2). The lever (4) loses the locking constraint between the slide rod (603) and the limiting hole (2) and gains the ability to rotate around its own pivot point. With sufficient movement; after the operator releases the pull head (601), the compressed push spring (602) releases its elastic thrust, pushing the slide rod (603) back along the slide hole (604) toward the disconnect switch body (1). The ball (606) at the bottom of the slide rod (603) then adheres to the groove surface of the arc groove (3). The annular dust cover (605) sleeved on the outside of the ball (606) simultaneously covers the groove opening of the arc groove (3), preventing dust, moisture, and oil from entering the rolling gap between the arc groove (3) and the ball (606) throughout the process. Then the operator rotates the lever (4) to complete the operation. During the switching action of opening and closing, the ball (606) always rolls along the inner wall of the arc groove (3) whose curvature matches the rotation trajectory of the lever (4) during the rotation of the lever (4). The rolling cooperation between the ball (606) and the arc groove (3) constrains the rotation path of the lever (4), ensuring that the lever (4) and the internal switch blade of the isolating switch body (1) rotate in complete synchronization until the lever (4) swings to the limit position corresponding to closing or opening. During the process of the lever (4) reaching the limit position, the side wall of the lever (4) first makes contact with the high elastic wear-resistant composite buffer fixed on the slider (504) in the buffer assembly (5). When the impact pad (55) contacts the lever (4), the rotational thrust of the lever (4) is transmitted to the slider (504) through the high-elasticity wear-resistant composite buffer pad (55). The slider (504) slides along the groove (502) opened on the inner side of the support plate (503) of the inverted L-shaped structure. During the sliding process, the slider (504) squeezes the buffer spring (501) assembled between the slider (504) and the inner wall of the support plate (503). The buffer spring (501) undergoes compression deformation to absorb the impact of the lever (4) reaching the position. The sliding stroke of the slider (504) matches the limit rotational displacement of the lever (4) to provide buffer clearance space for the lever (4).When the lever (4) moves to the limit positioning point, the elastic thrust of the push spring (602) continues to drive the slide rod (603) to move towards the isolating switch body (1). The bottom end of the slide rod (603) automatically engages in the corresponding limiting hole (2), completing the basic locking and limiting of the lever (4). At this time, the buffer spring (501) remains compressed and continues to apply a push force towards the lever (4) to the slider (504) and the high-elasticity wear-resistant composite buffer pad (55). The high-elasticity wear-resistant composite buffer pad (55) is pressed tightly against the side wall of the lever (4) to form a lateral pressure on the lever (4), increasing the frictional force between the outer wall of the slide rod (603) and the inner wall of the limiting hole (2). Relying on the snap-fit ​​between the slide rod (603) and the limiting hole (2) and the lateral pressing of the buffer assembly (5) to form a double limiting structure, the lever (4) is constrained from shifting or loosening, thus completing the stable locking of the disconnecting switch body (1) in the open and closed positions.

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