High-voltage cabinet door automatic interlocking device

Abstract

The utility model discloses a high -voltage cabinet cabinet door automatic interlocking device, it sets up between three work position mechanism, the operating mechanism of circuit breaker and cabinet door, including three work position interlocking mechanism, circuit breaker interlocking mechanism and cabinet door interlocking mechanism. The utility model discloses through three independent interlocking mechanisms respectively corresponding three work position mechanism, circuit breaker and the different state of cabinet door, the linkage relation between each mechanism is clear, and the independence of each interlocking mechanism is strong, when the failure of a certain mechanism, can individually overhaul and replace this mechanism, need not to the large -scale dismount of whole device, shorten maintenance time, has reduced maintenance cost, cabinet door interlocking mechanism can automatic restriction circuit breaker's opening operation when cabinet door opens, prevents the safety accident that causes because of the mistaken opening and provides reliable guarantee for the safe operation of high -voltage cabinet.

Description

Technical Field

[0001] This utility model relates to the field of switchgear technology, specifically to an automatic interlocking device for high-voltage switchgear doors. Background Technology

[0002] During the operation of high-voltage switchgear, the safety interlock of the switchgear door is crucial. The switchgear door uses an external lock (i.e., a manually operated lift-up lock) to open. Although this design was widely used in the early days due to its simple structure and low cost, its shortcomings in safety, reliability, and user experience have become increasingly apparent with the continuous development of industry: In terms of safety, this solution relies too heavily on the standardization of manual operation, making it prone to misoperation due to negligence, fatigue, and other factors, and it lacks an automatic power-off protection mechanism to deal with forced opening of the switchgear door by external force; in terms of reliability, the external mechanical components are exposed to a complex environment for a long time, making them susceptible to corrosion from dust, moisture, etc., which can lead to failure and affect the stability of equipment operation. Summary of the Invention

[0003] To overcome the above-mentioned defects, this utility model provides an automatic interlocking device for high-voltage switchgear doors that is simple in structure, has a clear interlocking relationship, is easy to operate and maintain.

[0004] The technical solution adopted by this utility model to solve its technical problem is to provide an automatic interlocking device for the cabinet door of a high-voltage switchgear, which is set between the three-position mechanism, the operating mechanism of the circuit breaker and the cabinet door. The operating mechanism has a main shaft and a half shaft sheet metal, and the inner side of the cabinet door is provided with a groove plate and a top pin. The upper and lower sides of the groove plate are provided with a first slot and a second slot. Automatic interlocking devices include: The three-position interlocking mechanism includes a first crank arm, a first locking pin, and a first transmission mechanism. The first crank arm is rotatably arranged on one side of the push plate of the three-position mechanism. The first locking pin is rotatably connected to the first crank arm through the first transmission mechanism. When the three-position mechanism is operated to the grounding position, the push plate drives the first crank arm to push out, and drives the first transmission mechanism to drive the first locking pin to rotate and disengage from the first locking slot. The circuit breaker interlocking mechanism includes a main shaft swing arm, a second locking pin, and a second transmission mechanism. The main shaft swing arm is fixed on the main shaft, and the second locking pin is rotatably connected to the main shaft swing arm through the second transmission mechanism. When the circuit breaker is in the closed state, the main shaft drives the main shaft swing arm to swing, thereby driving the second transmission mechanism to rotate the second locking pin and disengage it from the second locking slot. The cabinet door interlocking mechanism includes a limiting mechanism, an elastic drive mechanism, and a third transmission mechanism. The limiting plate of the limiting mechanism blocks one side of the half-shaft sheet metal and is connected to the elastic drive mechanism through the third transmission mechanism. The top pin is pressed against the elastic drive mechanism. When the cabinet door opens outward, it causes the top pin to move away. The elastic drive mechanism drives the limiting mechanism through the third transmission mechanism to move the limiting plate up to block the half-shaft sheet metal.

[0005] As a further improvement of this utility model, the first transmission mechanism includes a vertically arranged first connecting rod A and a horizontally arranged first connecting rod B. One end of the first connecting rod A is rotatably connected to the first crank arm, and the other end is movably connected to the first connecting rod B through the first swing arm. The other end of the first connecting rod B passes through the first mounting base and is fixedly connected to the first locking pin.

[0006] As a further improvement of this utility model, the first crank arm is located on the side of the three-position mechanism via a connecting seat fixed to the operating mechanism. The first crank arm is rotatably connected to the upper end of the connecting seat via a shaft. The first connecting rod A and the push plate are movably connected to the two ends of the first crank arm, respectively.

[0007] As a further improvement of this utility model, the second transmission mechanism includes a second connecting rod A and a second connecting rod B. The second connecting rod A is parallel to the first connecting rod A and is movably disposed beside the first connecting rod A through a second mounting seat. The second connecting rod B is parallel to the first connecting rod B and is arranged below the first connecting rod B. One end of the second connecting rod B is movably connected to the lower end of the second connecting rod A through a second swing arm, and the other end passes through the first mounting seat and is fixedly connected to the second locking pin.

[0008] As a further improvement of this utility model, the third transmission mechanism includes a third link A and a third link B. The third link A is arranged parallel to the side of the second link A, and the third link B is arranged parallel to the bottom of the second link B. One end of the third link B is movably connected to the lower end of the third link A through a second crank arm assembly. The elastic drive mechanism has a top rod that is coaxial with the third link B and movably passes through the first mounting base, and a spring sleeved on the top rod. The other end of the third link B is fixedly connected to the top rod.

[0009] As a further improvement of this utility model, the second crank arm assembly includes: Third mounting bracket; The positioning shaft is fixedly mounted on the third mounting base; The second crank arm is provided in two parts. The two second crank arms are parallel to each other along the axial direction of the positioning shaft and are spaced apart. At the same time, the inflection point of the two second crank arms is rotatably connected to the positioning shaft. A drive connecting shaft is provided, with its two ends connected to the drive ends of the two second crank arms respectively, and the lower end of the third link A is fixedly connected to the drive connecting shaft. The driven connecting shaft has its two ends connected to the driven ends of the two second crank arms, and the end of the third connecting rod B opposite to the top rod is fixedly connected to the driven connecting shaft.

[0010] As a further improvement of this utility model, the first connecting rod A is slidably connected to the second mounting base through a first linear bearing; The second connecting rod A is slidably connected to the second mounting base via the second linear bearing, and the upper end of the second connecting rod A abuts against the roller shaft of the main shaft swing arm.

[0011] As a further improvement of this utility model, the first card slot and the second card slot are staggered and disposed on the slot plate.

[0012] The beneficial effects of this utility model are as follows: Three independent interlocking mechanisms correspond to different states of the three-position mechanism, circuit breaker, and cabinet door, respectively. The linkage between each mechanism is clear, and each interlocking mechanism is highly independent. When a certain mechanism malfunctions, it can be repaired and replaced individually without requiring large-scale disassembly of the entire device, thus shortening maintenance time and reducing maintenance costs. Simultaneously, the cabinet door interlocking mechanism automatically restricts the circuit breaker's tripping operation when the cabinet door is open, preventing safety accidents caused by accidental tripping and providing reliable protection for the safe operation of the high-voltage switchgear. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the cabinet door in the closed state of this utility model; Figure 2 This utility model Figure 1 A magnified structural diagram at point I; Figure 3 For the present utility model Figure 1 Enlarged structural diagram at point II; Figure 4 This is a structural schematic diagram of the cabinet door in the closed state of this utility model; Figure 5 This is a structural diagram of the cabinet door in the open state of this utility model.

[0014] Referring to the accompanying drawings, the following explanations are provided: 1. Three-station mechanism; 101. Push plate; 2. Cabinet door; 20. Top pin; 21. First slot; 22. Second slot; 3. Main shaft; 30. Half shaft sheet metal; 4. Three-station interlocking mechanism; 41. First crank arm; 42. First locking pin; 43. First transmission mechanism; 431. First connecting rod A; 432. First connecting rod B; 433. First swing arm; 434. First linear bearing; 44. Connecting seat; 5. Circuit breaker interlocking mechanism; 51. Main shaft swing arm; 511. Roller shaft; 52. Second locking pin; 53. Second transmission mechanism; 531. Second connecting rod A; 532. Second connecting rod B; 533. Second swing arm; 534. Second linear bearing; 6. Cabinet door interlocking mechanism; 61. Limiting mechanism; 611. Limiting plate; 62. Elastic drive mechanism; 621. Top rod; 622. Spring; 63. Third transmission mechanism; 631. Third connecting rod A; 632. Third connecting rod B; 633. Third mounting base; 634. Positioning shaft; 635. Second crank arm; 6351. Driven end; 6352. Driven end; 636. Drive connecting shaft; 637. Driven connecting shaft; 7. First mounting base; 8. Second mounting base. Detailed Implementation

[0015] The preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0016] See Figures 1 to 5 This utility model provides an automatic interlocking device for the cabinet door of a high-voltage switchgear, used for interlocking between a three-position disconnector, a circuit breaker and the cabinet door, including a three-position interlocking mechanism 4, a circuit breaker interlocking mechanism 5 and a cabinet door interlocking mechanism 6.

[0017] It should be noted that the three-position disconnect switch and circuit breaker in this application adopt existing technology.

[0018] The three-position disconnect switch includes a three-position mechanism 1, which is used to switch the operating state of the three-position disconnect switch. The three-position mechanism 1 has three positions: grounding closed, open, and disconnect closed. The three-position mechanism 1 is equipped with a push plate 101. When the three-position mechanism 1 is in the open or disconnect closed position, the push plate 101 remains stationary; when the three-position mechanism 1 is in the grounding closed position, the push plate 101 is pushed out to the right.

[0019] The circuit breaker's operating mechanism includes a main shaft 3, a tripping half-shaft, and a sheet metal half-shaft 30 that is linked to the tripping half-shaft. The tripping half-shaft is drive-connected to the main shaft 3. When the main shaft 3 is driven to rotate, it can perform opening and closing actions in conjunction with the circuit breaker. When the circuit breaker needs to switch from closed to open, the main shaft 201 is released to rotate by driving the tripping half-shaft 202, thereby linking it to the circuit breaker to perform a tripping action.

[0020] In addition, the three-station mechanism and the circuit breaker are both installed in the cabinet, which has a cabinet door 2 (referred to in the industry as the lower door).

[0021] The difference from the prior art is that the cabinet door 2 of this application has a groove plate and a top pin 20 on its inner side. The groove plate has a first slot 21 and a second slot 22 on its upper and lower sides, and the positions of the first slot 21 and the second slot 22 are staggered to avoid interference between the first locking pin 42 and the second locking pin 52 during movement, which would affect the reliability of the locking. The cabinet door 2 is located below the operating mechanism, the three-position mechanism 1 is located on top of the operating mechanism, and the interlocking device is located between the three-position mechanism 1, the operating mechanism, and the cabinet door 2.

[0022] The three-position interlocking mechanism 4 includes a first crank arm 41, a first locking pin 42, and a first transmission mechanism 43. The first crank arm 41 is rotatably arranged at the right end of the push plate 101 of the three-position mechanism 1. The first locking pin 42 is rotatably connected to the first crank arm 41 through the first transmission mechanism 43, and the first locking pin 42 is engaged in the first locking groove 21 so that the cabinet door 2 cannot be opened outward.

[0023] Specifically, the first transmission mechanism 43 has a first connecting rod A431 and a first connecting rod B432 arranged perpendicularly to each other in an "L" shape. The first connecting rod A431 is slidably mounted on the second mounting base 8 in the vertical direction via a first linear bearing 434. Its upper end is rotatably connected to the first crank arm 41, and its lower end is movably connected to the first connecting rod B432 via a first swing arm 433. The other end of the first connecting rod B432 passes through the first mounting base 7 and is fixedly connected to the first locking pin 42. The first crank arm 41 is located on the side of the three-position mechanism 1 via a connecting seat 44 fixed to the operating mechanism. The first crank arm 41 is rotatably connected to the upper end of the connecting seat 44 via a shaft. The first connecting rod A431 and the push plate 101 are movably connected to the two ends of the first crank arm 41, respectively.

[0024] When the push plate 101 of the three-station mechanism 1 is pushed out or retracted, the first connecting rod A431 is driven to move up and down in the vertical direction through the first crank arm 41. Since the first connecting rod B432 is connected to the first connecting rod A431 through the first swing arm 433, the first swing arm 433 transmits the up and down movement of the first connecting rod A431 and converts it into the rotational movement of the first connecting rod B432, so that the first connecting rod B432 rotates clockwise or counterclockwise around its axis, thereby driving the first locking pin 42 on it to rotate, so as to realize the partial locking or unlocking function of the cabinet door, that is, to realize the first locking or unlocking function of the cabinet door.

[0025] The second mounting base 8 is fixedly installed outside the frame of the operating mechanism (not shown in the figure) and located below the main shaft 3.

[0026] Furthermore, the circuit breaker interlocking mechanism 5 includes a main shaft swing arm 51, a second locking pin 52, and a second transmission mechanism 53. One end of the main shaft 3 passes through the frame of the operating mechanism and is fixedly connected to the main shaft swing arm 51. The second locking pin 52 is rotatably connected to the main shaft swing arm 51 through the second transmission mechanism 53. The second transmission mechanism and the first transmission mechanism are arranged in parallel to each other, so that the three-position interlocking mechanism 4 and the circuit breaker interlocking mechanism 5 are independent modules, which not only reduces the space occupied by the entire interlocking mechanism, but also facilitates independent maintenance and replacement operations.

[0027] The second transmission mechanism 53 includes a second connecting rod A531 and a second connecting rod B532. The second connecting rod A531 is parallel to the first connecting rod A431 and is movably disposed beside the first connecting rod A431 via the second mounting base 8. The second connecting rod B532 is parallel to the first connecting rod B432 and is arranged below the first connecting rod B432. One end of the second connecting rod B532 is movably connected to the lower end of the second connecting rod A531 via the second swing arm 533, and the other end passes through the first mounting base 7 and is fixedly connected to the second locking pin 52. The second connecting rod A531 is slidably connected to the second mounting base 8 via the second linear bearing 534, and the upper end of the second connecting rod A531 abuts against the roller shaft 511 of the main shaft swing arm 51.

[0028] When the main shaft 3 rotates counterclockwise, it drives the main shaft swing arm 51 on it to rotate counterclockwise, causing the roller shaft 511 on it to press down the second connecting rod A531 and move it down, causing the second swing arm 533 to drive the second connecting rod B532 to rotate the second locking pin 52, so as to realize the complete locking or unlocking function of the cabinet door, that is, to realize the second locking or unlocking function of the cabinet door.

[0029] Furthermore, the cabinet door interlocking mechanism 6 includes a limiting mechanism 61, an elastic drive mechanism 62, and a third transmission mechanism 63. The limiting plate 611 of the limiting mechanism 61 blocks the front side of the half-shaft sheet metal 30 and is connected to the elastic drive mechanism 62 through the third transmission mechanism 63. The top pin 20 abuts against the elastic drive mechanism 62. The third transmission mechanism 63 includes a third link A631 and a third link B632. The third link A631 is arranged parallel to the side of the second link A531, and the third link B632 is arranged parallel to the bottom of the second link B532. One end of the third link B632 is movably connected to the lower end of the third link A631 through the second crank arm assembly. The elastic drive mechanism 62 has a top rod 621 coaxial with the third link B632 and movably passing through the first mounting base 7, and a spring 622 sleeved on the top rod 621. The other end of the third link B632 is fixedly connected to the top rod 621.

[0030] Specifically, the second crank arm assembly includes a third mounting base 633, a positioning shaft 634 fixedly mounted on the third mounting base 633, and second crank arms 635 rotatably mounted at the left and right ends of the positioning shaft 634. The two driving ends 6351 of the two second crank arms 635 are connected to a driving connecting shaft 636, and the lower end of the third connecting rod A 631 is fixedly connected to the driving connecting shaft 636. The two driven ends 6352 of the two second crank arms 635 are connected to a driven connecting shaft 637, and the end of the third connecting rod B 632 facing away from the top rod 621 is fixedly connected to the driven connecting shaft 637.

[0031] When the three-position mechanism 1 is operated to the grounding closed position and the circuit breaker is in the closed state, both the first locking pin 42 and the second locking pin 52 are in the disengaged state. The cabinet door loses its restraint, causing the push rod 621 of the elastic drive mechanism 62 to quickly pop forward under the restoring force of the spring 622, pushing the cabinet door open. At the same time, as the push rod extends forward, it synchronously drives the connected third link B632 to move forward, thereby driving the second crank arm 635 to push the third link A631 upward, which in turn drives the limit plate 611 upward to block the front side of the half-shaft sheet metal 30, preventing the circuit breaker from performing the opening operation.

[0032] In summary, the high-voltage switchgear door automatic interlocking device provided in this application has a compact structure. It uses three independent interlocking mechanisms to correspond to different states of the three-position mechanism, circuit breaker, and switchgear door, respectively. The linkage between these mechanisms is clear, and each interlocking mechanism is highly independent. When a mechanism malfunctions, it can be repaired and replaced individually without requiring large-scale disassembly of the entire device, thus shortening maintenance time and reducing maintenance costs. Simultaneously, the switchgear door interlocking mechanism automatically restricts the circuit breaker's tripping operation when the switchgear door is open, preventing safety accidents caused by accidental tripping and providing reliable protection for the safe operation of the high-voltage switchgear.

[0033] Many specific details have been set forth in the above description to provide a full understanding of this utility model. However, the above description is only a preferred embodiment of this utility model, and this utility model can be implemented in many other ways different from those described herein. Therefore, this utility model is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, shall still fall within the protection scope of the technical solution of this utility model.

Claims

1. An automatic interlocking device for a high-voltage switchgear door, disposed between a three-position mechanism (1), a circuit breaker operating mechanism, and a switchgear door (2), wherein the operating mechanism has a main shaft (3) and a half-shaft sheet metal, characterized in that: The cabinet door (2) has a groove plate and a top pin (20) on the inside. The groove plate has a first slot (21) and a second slot (22) on the upper and lower sides. Automatic interlocking devices include: The three-position interlocking mechanism (4) includes a first crank arm (41), a first locking pin (42) and a first transmission mechanism (43). The first crank arm (41) is rotatably arranged on one side of the push plate (101) of the three-position mechanism (1). The first locking pin (42) is rotatably connected to the first crank arm (41) through the first transmission mechanism (43). When the three-position mechanism (1) is operated to the grounding position, the push plate (101) drives the first crank arm (41) to push out, and drives the first transmission mechanism (43) to drive the first locking pin (42) to rotate and disengage from the first locking groove (21). The circuit breaker interlocking mechanism (5) includes a main shaft swing arm (51), a second locking pin (52), and a second transmission mechanism (53). The main shaft swing arm (51) is fixed on the main shaft (3), and the second locking pin (52) is rotatably connected to the main shaft swing arm (51) through the second transmission mechanism (53). When the circuit breaker is in the closed state, the main shaft (3) drives the main shaft swing arm (51) to swing, so as to drive the second transmission mechanism (53) to drive the second locking pin (52) to rotate and disengage from the second locking slot (22). The cabinet door interlocking mechanism (6) includes a limiting mechanism (61), an elastic drive mechanism (62), and a third transmission mechanism (63). The limiting plate (611) of the limiting mechanism (61) blocks one side of the half-shaft sheet metal and is connected to the elastic drive mechanism (62) through the third transmission mechanism (63). The top pin (20) abuts against the elastic drive mechanism (62). When the cabinet door (2) opens outward, the top pin (20) moves away, and the elastic drive mechanism (62) drives the limiting mechanism (61) through the third transmission mechanism (63) to move the limiting plate (611) upward to block the half-shaft sheet metal (30).

2. The automatic interlocking device for high-voltage switchgear doors according to claim 1, characterized in that: The first transmission mechanism (43) includes a vertically arranged first link A (431) and a horizontally arranged first link B (432). One end of the first link A (431) is rotatably connected to the first crank arm (41), and the other end is movably connected to the first link B (432) through the first swing arm (433). The other end of the first connecting rod B (432) passes through the first mounting base (7) and is fixedly connected to the first locking pin (42).

3. The automatic interlocking device for high-voltage switchgear doors according to claim 2, characterized in that: The first crank arm (41) is located on the side of the three-station mechanism (1) via a connecting seat (44) fixed to the operating mechanism. The first crank arm (41) is rotatably connected to the upper end of the connecting seat (44) via a shaft. The first connecting rod A (431) and the push plate (101) are movably connected to the two ends of the first crank arm (41) respectively.

4. The automatic interlocking device for high-voltage switchgear door according to claim 2, characterized in that: The second transmission mechanism (53) includes a second link A (531) and a second link B (532). The second link A (531) is parallel to the first link A (431) and is movably disposed beside the first link A (431) through the second mounting seat (8). The second link B (532) is parallel to the first link B (432) and is arranged below the first link B (432). One end of the link B (532) is movably connected to the lower end of the second link A (531) through the second swing arm (533), and the other end passes through the first mounting seat (7) and is fixedly connected to the second locking pin (52).

5. The automatic interlocking device for high-voltage switchgear doors according to claim 4, characterized in that: The third transmission mechanism (63) includes a third link A (631) and a third link B (632). The third link A (631) is arranged parallel to the side of the second link A (531), and the third link B (632) is arranged parallel to the bottom of the second link B (532). One end of the third link B (631) is movably connected to the lower end of the third link A (631) through a second crank arm assembly. The elastic drive mechanism (62) has a top rod (621) that is coaxial with the third link B (632) and movably passes through the first mounting base (7), and a spring (622) sleeved on the top rod (621). The other end of the third link B (632) is fixedly connected to the top rod (621).

6. The automatic interlocking device for high-voltage switchgear doors according to claim 5, characterized in that: The second crank arm assembly includes: Third mounting bracket (633); The positioning shaft (634) is fixedly mounted on the third mounting base (633); There are two second crank arms (635). The two second crank arms (635) are parallel to each other along the axial direction of the positioning shaft (634) and spaced apart. At the same time, the inflection points of the two second crank arms (635) are rotatably connected to the positioning shaft (634). The drive connecting shaft (636) is connected at both ends to the drive ends (6351) of the two second crank arms (635) respectively, and the lower end of the third link A (631) is fixedly connected to the drive connecting shaft (636). The driven connecting shaft (637) has its two ends connected to the driven ends (6352) of the two second crank arms (635) respectively, and the end of the third link B (632) away from the top rod (621) is fixedly connected to the driven connecting shaft (637).

7. The automatic interlocking device for high-voltage switchgear doors according to claim 6, characterized in that: The first connecting rod A (431) is slidably connected to the second mounting base (8) via the first linear bearing (434); The second connecting rod A (531) is slidably connected to the second mounting base (8) through the second linear bearing (534), and the upper end of the second connecting rod A (531) abuts against the roller (511) of the main shaft swing arm (51).

8. The automatic interlocking device for high-voltage switchgear doors according to claim 3, characterized in that: The first card slot (21) and the second card slot (22) are offset and placed in the slot plate.

Images