A key interlocking device for a grounding switch and a switch cabinet

Abstract

This invention provides a key interlocking device for a grounding switch, relating to the field of switchgear technology. The key interlocking device includes a support assembly, a linkage assembly, and a lock box assembly. The support assembly has a linkage assembly that can move back and forth. The linkage assembly has a stop bar that cooperates with a limit plate on the operating shaft of the grounding switch. The lock box assembly includes a support and a cover hinged to the support for blocking the operating hole of the operating shaft. The cover abuts against the linkage assembly. This invention also provides a switch cabinet using the above-described key interlocking device. By limiting the position of the limit plate on the operating shaft when the grounding switch is closed, the closing of the cover blocking the operating hole is restricted, thus limiting key removal. This ensures that the key can only be removed when the grounding switch is open and the cover is locked simultaneously, ultimately achieving key interlocking between the grounding switch open state, the circuit breaker closed state, and access to the compartment.

Description

Technical Field

[0001] This invention belongs to the field of switchgear technology, and in particular relates to a key interlocking device and switch cabinet for a grounding switch. Background Technology

[0002] In power systems, "five-prevention" is an abbreviation for five anti-misoperation functions that high-voltage electrical equipment should possess to ensure personal safety. These five preventions include preventing accidental opening or closing of circuit breakers, preventing opening or closing of disconnecting switches under load, preventing the connection of grounding wires while energized, preventing the closing of circuit breakers with live wires, and preventing accidental entry into energized compartments. Of these anti-misoperation functions, the last two require that the grounding switch be kept in the open position before operating the circuit breaker to close it or before personnel can enter the compartment.

[0003] In traditional technology, when closing a circuit breaker or entering a compartment, a mechanical device is typically used to prevent the grounding switch's operating rod from rotating, thus limiting the grounding switch's closing and ensuring the safety of subsequent circuit breaker closing and personnel entering the compartment. However, in practical applications, when personnel open the grounding switch and then perform circuit breaker closing operations or enter the compartment, the grounding switch's operating shaft is exposed. Other personnel may attempt to rotate the shaft, and even with the mechanical device's restraint, some unaware of the anti-misoperation function might mistakenly believe that insufficient force is being applied to stop the operating rod, and thus forcibly rotate it, disabling the mechanical device's anti-misoperation function.

[0004] To prevent the grounding switch from being closed while personnel are performing circuit breaker closing operations or entering the compartment, existing technology adds a lockable protective cover to the switchgear to cover the operating hole of the grounding switch operating shaft. Locks are also installed on both the circuit breaker compartment and the compartment, using the same key as the protective cover. When it is necessary to close the circuit breaker or enter the compartment, the grounding switch is set to the open position, and then the operating hole is covered by the protective cover. However, because the key on the protective cover can be freely inserted and removed, once the protective cover is open, the circuit breaker compartment and compartment can be opened with the key regardless of whether the grounding switch is in the open or closed position. This still cannot prevent the circuit breaker from being closed while the grounding switch is closed, or personnel from entering the compartment. Therefore, a reliable interlocking device is urgently needed to ensure that the grounding switch is in the open position before the circuit breaker operating compartment and compartment can be opened and operated. Summary of the Invention

[0005] The purpose of this invention is to provide a key interlocking device for a grounding switch, thereby solving the technical problem of unreliable interlocking methods between the grounding switch operating shaft and the circuit breaker compartment, and between the grounding switch operating shaft and the compartment in the prior art. Another purpose of this invention is to provide a switch cabinet to solve the same technical problem.

[0006] To achieve the above objectives, the technical solution of the key interlocking device for the grounding switch provided by the present invention is as follows: The key interlocking device for the grounding switch includes a lock box assembly, the lock box assembly including a support for connection to the cabinet of the switch cabinet, a cover hinged to the support, and a through slot on the support for corresponding to the operating hole of the grounding switch so that the operating hole is exposed when the cover is opened. The box cover is equipped with a key-driven latch, and the support is equipped with a lock groove for the latch to enter. The inside of the box cover is equipped with a pressure plate that can move in the direction of approaching and moving away from the box cover. The pressure plate has a stop position for blocking the latch from rotating to prevent the key from being pulled out and a separation position for separating from the latch so that the latch can rotate. A reset elastic element is connected between the lid and the pressure plate to move the pressure plate to the stop position when the lid is opened; The support is provided with a stop for the pressure plate to move from the stop position to the separation position when the lid is closed; The interlocking device also includes a bracket assembly for fixing to the cabinet and a limit plate for fixing to the operating shaft of the grounding switch. The bracket assembly is provided with a linkage component that can move back and forth. The linkage component has a stop position that extends forward to block the box cover from closing. The linkage component is provided with a stop bar. In the closed state, the limit plate stops the stop bar to restrict the linkage component from retracting from the stop position. In the open state, the limit plate avoids the stop bar so that the linkage component can move back and forth. The linkage component is equipped with a driving elastic element to move the linkage component forward to the blocking position when the lid is opened.

[0007] This invention is a pioneering creation, and its beneficial effects are as follows: The operating hole of the grounding switch operating shaft is covered and locked by the cover and support, preventing unauthorized personnel from closing the grounding switch while the operator is closing the circuit breaker or inside the compartment; the locking tongue is prevented from rotating by the pressure plate and reset elastic element to prevent the key from being removed when the cover is not fully closed, allowing the key to be removed only when the cover is fully closed; the linkage assembly and drive elastic element allow the linkage assembly to slide in a limited manner parallel to the operating shaft axis; the position change of the upper limit plate on the operating shaft when switching between open and closed states allows for the avoidance and blocking of the stop lever on the linkage assembly, thereby controlling the limited sliding and blocking of the linkage assembly along the operating shaft direction, achieving control over the locking and opening states of the cover, and ultimately enabling the removal and locking of the key on the cover. This invention, through layer-by-layer control, ultimately achieves interlocking between the grounding switch closing state and the prevention of key removal, effectively preventing situations where the key is removed to open the circuit breaker compartment for closing or to enter the compartment for maintenance while the grounding switch is closed, ensuring personal safety.

[0008] As a further improvement, the lid includes a lid body, and a baffle is fixed on the inner side of the lid body. The baffle has a top that abuts against the moving parts throughout the entire process of their movement.

[0009] As a further improvement, the top abutment includes a first abutment surface for abutting and engaging with the linkage component when the lid is open, a second abutment surface for abutting and engaging with the linkage component when the lid is closed, and a transition surface located between the first abutment surface and the second abutment surface.

[0010] As a further improvement, the linkage assembly has a plate-like structure, and the plate surface of the linkage assembly is configured to be parallel to the operating axis of the grounding switch and the hinge axis of the cover when in use.

[0011] As a further improvement, the front end of the linkage component is provided with a bent portion that bends towards the support side, and the bent portion is used to make contact with the lid.

[0012] As a further improvement, the linkage assembly has a stop edge located on the rear side of the bracket assembly, and the driving elastic element is a tension spring sleeved on the linkage assembly, with both ends of the tension spring connected to the front end of the stop edge and the rear end of the bracket assembly, respectively; or the linkage assembly has a stop edge located on the rear side of the bracket assembly, and the driving elastic element is a compression spring sleeved on the linkage assembly, with both ends of the compression spring contacting the rear end of the stop edge and the front end of the bracket assembly, respectively.

[0013] As a further improvement, the linkage assembly includes a transmission plate, an intermediate plate, and a guide plate connected sequentially from front to back. The guide plate is guided and engaged with the bracket assembly, and the stop is provided on the guide plate.

[0014] As a further improvement, the bracket assembly includes a bracket for fixing to the cabinet and an auxiliary plate connected to the bracket. The bracket has an opening slot, and the auxiliary plate surrounds the opening slot to form a guide hole that cooperates with the guide plate.

[0015] As a further improvement, the transmission plate, intermediate plate and guide plate are connected in sequence by bolts. The transmission plate, intermediate plate and guide plate are all provided with through holes for bolts to pass through, and the through holes are elongated holes extending along the length of each plate.

[0016] To achieve the above objectives, the technical solution for the switchgear provided by this invention is as follows: A switch cabinet includes a cabinet body, a grounding switch operating mechanism inside the cabinet body, the grounding switch operating mechanism including an operating shaft, an operating hole for the grounding switch operating shaft on the cabinet body, and a key interlocking device for the grounding switch. The key interlocking device for the grounding switch includes a lock box assembly, the lock box assembly including a support for connecting to the cabinet body of the switch cabinet, a cover hinged to the support, and a through groove on the support corresponding to the operating hole of the grounding switch so that the operating hole is exposed when the cover is opened. The box cover is equipped with a key-driven latch, and the support is equipped with a lock groove for the latch to enter. The inside of the box cover is equipped with a pressure plate that can move in the direction of approaching and moving away from the box cover. The pressure plate has a stop position for blocking the latch from rotating to prevent the key from being pulled out and a separation position for separating from the latch so that the latch can rotate. A reset elastic element is connected between the lid and the pressure plate to move the pressure plate to the stop position when the lid is opened; The support is provided with a stop for the pressure plate to move from the stop position to the separation position when the lid is closed; The interlocking device also includes a bracket assembly for fixing to the cabinet and a limit plate for fixing to the operating shaft of the grounding switch. The bracket assembly is provided with a linkage component that can move back and forth. The linkage component has a stop position that extends forward to block the box cover from closing. The linkage component is provided with a stop bar. In the closed state, the limit plate stops the stop bar to restrict the linkage component from retracting from the stop position. In the open state, the limit plate avoids the stop bar so that the linkage component can move back and forth. The linkage component is equipped with a driving elastic element to move the linkage component forward to the blocking position when the lid is opened.

[0017] This invention is an improved invention, and its beneficial effects are as follows: By using a key interlocking device to control the open state of the grounding switch and the locked state of the cover, the key on the cover can only be removed to open the circuit breaker compartment and the partition when the grounding switch is in the open state and the cover is in the locked state. When the grounding switch is in the closed state, the cover is restricted to be closed, thereby ensuring that the circuit breaker can only be closed and the partition can only be entered when the grounding switch is in the open state, and the key is restricted from being removed to close the circuit breaker and enter the partition when the grounding switch is in the closed state. This avoids the situation where the circuit breaker is closed or the partition is entered when the grounding switch is closed, thus ensuring personal safety and the safe operation of the switchgear.

[0018] As a further improvement, the lid includes a lid body, and a baffle is fixed on the inner side of the lid body. The baffle has a top that abuts against the moving parts throughout the entire process of their movement.

[0019] As a further improvement, the top abutment includes a first abutment surface for abutting and engaging with the linkage component when the lid is open, a second abutment surface for abutting and engaging with the linkage component when the lid is closed, and a transition surface located between the first abutment surface and the second abutment surface.

[0020] As a further improvement, the linkage assembly has a plate-like structure, and the plate surface of the linkage assembly is configured to be parallel to the operating axis of the grounding switch and the hinge axis of the cover when in use.

[0021] As a further improvement, the front end of the linkage component is provided with a bent portion that bends towards the support side, and the bent portion is used to make contact with the lid.

[0022] As a further improvement, the linkage assembly has a stop edge located on the rear side of the bracket assembly, and the driving elastic element is a tension spring sleeved on the linkage assembly, with both ends of the tension spring connected to the front end of the stop edge and the rear end of the bracket assembly, respectively; or the linkage assembly has a stop edge located on the rear side of the bracket assembly, and the driving elastic element is a compression spring sleeved on the linkage assembly, with both ends of the compression spring contacting the rear end of the stop edge and the front end of the bracket assembly, respectively.

[0023] As a further improvement, the linkage assembly includes a transmission plate, an intermediate plate, and a guide plate connected sequentially from front to back. The guide plate is guided and engaged with the bracket assembly, and the stop is provided on the guide plate.

[0024] As a further improvement, the bracket assembly includes a bracket for fixing to the cabinet and an auxiliary plate connected to the bracket. The bracket has an opening slot, and the auxiliary plate surrounds the opening slot to form a guide hole that cooperates with the guide plate.

[0025] As a further improvement, the transmission plate, intermediate plate and guide plate are connected in sequence by bolts. The transmission plate, intermediate plate and guide plate are all provided with through holes for bolts to pass through, and the through holes are elongated holes extending along the length of each plate. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the key interlocking device of the present invention installed on a switch cabinet; Figure 2 for Figure 1 Schematic diagram of the middle support assembly; Figure 3 for Figure 1 A schematic diagram of the structure of the central linkage component; Figure 4 for Figure 1 A schematic diagram of the connection between the central support and the box cover; Figure 5 for Figure 1 A schematic diagram of the structure inside the box lid; Figure 6 A schematic diagram of the overall connection structure between the key interlock device and the grounding switch when the grounding switch is open and the box cover is closed; Figure 7 for Figure 6 A schematic diagram of the cooperation structure between the central interlocking device and the grounding switch operating shaft (driving elastic element not shown). Figure 8 for Figure 6 A schematic diagram of the cooperation structure between the central interlocking device and the grounding switch operating shaft from a second perspective (driving elastic element not shown). Figure 9 A schematic diagram of the overall connection structure between the key interlock device and the grounding switch when the grounding switch is tripped and the box cover is open; Figure 10 for Figure 9 A schematic diagram of the cooperation structure between the central interlocking device and the grounding switch operating shaft (driving elastic element not shown). Figure 11 for Figure 9 A schematic diagram of the cooperation structure between the central interlocking device and the grounding switch operating shaft from a second perspective (driving elastic element not shown). Figure 12 for Figure 11 A partial structural diagram of the linkage component and the inner side of the box cover cooperating with the operating shaft of the grounding switch; Figure 13 A schematic diagram of the overall connection structure between the key interlocking device and the grounding switch when the grounding switch is closed; Figure 14 for Figure 13 A schematic diagram of the cooperation structure between the central interlocking device and the grounding switch operating shaft (driving elastic element not shown). Figure 15 for Figure 13 A schematic diagram of the cooperation structure between the central interlocking device and the grounding switch operating shaft from a second perspective (driving elastic element not shown). Figure 16 for Figure 15 A partial structural diagram of the linkage component and the internal structure of the box cover that mates with the operating shaft of the grounding switch.

[0027] Explanation of reference numerals in the attached figures: 1. Grounding switch; 2. Operating shaft; 3. Side plate; 4. Bracket assembly; 4-1. L-shaped plate; 4-1-1. Rectangular groove; 4-1-2. Clearance groove; 4-1-3. Opening groove; 4-2. Auxiliary plate; 5. Linkage assembly; 5-1. Guide plate; 5-2. Intermediate plate; 5-3. Transmission plate; 5-4. Stop bar; 5-5. Bending part; 6. Lock box assembly; 6-1. Support; 6-1-1. Through groove; 6-1-2. Lock groove; 6-1- 3. Mounting plate; 6-1-4. Edge retainer; 6-2. Cover; 6-2-1. Cover edge; 6-2-2. Cover body; 6-3. Rotating shaft; 6-4. Baffle; 6-4-1. First abutting plane; 6-4-2. Second abutting plane; 6-5. Lock body; 6-6. Key; 6-7. Lock tongue; 6-8. Pressure plate; 6-9. Reset elastic element; 6-10. Guide post; 7. Operating hole; 8. Driving elastic element; 9. Limiting plate; 10. Follower plate. Detailed Implementation

[0028] To solve the above problems, the basic technical concept of this invention is: by limiting the position of the upper limit plate on the operating shaft when the grounding switch is closed, the closing of the cover used to block the operating hole is restricted, thereby limiting the removal of the key. This ensures that the key can only be removed when the grounding switch is open and the cover is locked at the same time, and ultimately realizes the interlocking of the grounding switch closed state with the prevention of circuit breaker closing and the prevention of entry into the compartment.

[0029] The present invention will be further described in detail below with reference to the embodiments.

[0030] Before describing the embodiments of the present invention, based on the conventional understanding in the industry, the location of the grounding switch is defined as the rear of the switch cabinet, and the location of the lock box assembly is defined as the front of the switch cabinet.

[0031] Specific embodiments of the switchgear provided by this invention: A switch cabinet includes a cabinet body, such as Figure 1 As shown, the cabinet contains a grounding switch 1 and an operating mechanism connected to the grounding switch 1. The operating mechanism includes an operating shaft 2 that switches the grounding switch 1 between open and closed states by rotation. A limit plate 9 is provided on the operating shaft 2, which rotates synchronously with the operating shaft 2. The side plate 3 of the switch cabinet has an operating hole 7 for operating the operating shaft 2, and a key interlocking device that is linked and controlled with the operating shaft 2 is also connected to the side plate 3.

[0032] like Figure 1 , Figure 4 and Figure 5 As shown, the key interlocking device includes a lock box assembly 6 connected to the side plate 3 of the switch cabinet to cover the operation hole 7. The lock box assembly 6 includes a support 6-1 connected to the side plate 3 and a cover 6-2 hinged to the support 6-1. Specifically, the cover 6-2 is hinged to the support 6-1 via a rotating shaft 6-3. Both the cover 6-2 and the support 6-1 have corresponding mounting holes. The rotating shaft 6-3 is inserted into the mounting holes to allow the cover 6-2 to rotate and open / close around the rotating shaft 6-3. Of course, in other embodiments, it is also possible to hinge the upper and lower ends of the cover 6-2 to the support 6-1 using pins or hinges, as long as the cover 6-2 can rotate and open / close relative to the support 6-1.

[0033] like Figure 4 , Figure 5As shown, the support 6-1 includes a mounting plate 6-1-3 fixedly connected to the cabinet. The center of the mounting plate 6-1-3 is provided with a through groove 6-1-1 formed by a retaining edge 6-1-4. The through groove 6-1-1 corresponds to the position of the operating hole 7, and a lock groove 6-1-2 is provided on the retaining edge 6-1-4 on the side of the through groove 6-1-1 away from the hinge axis. The cover 6-2 includes a cover edge 6-2-1 and a cover body 6-2-2. A lock body 6-5 is connected to the cover 6-2. The lock body 6-5 is provided with a mortise for inserting a key 6-6, and the inner end of the lock body 6-5 is provided with a latch 6-7 that can rotate synchronously with the lock body 6-5. Rotating the key 6-6 causes the latch 6-7 to rotate, allowing it to enter the locking groove 6-1-2 on the support 6-1, thus keeping the cover 6-2 locked, or causing the latch 6-7 to rotate out of the locking groove 6-1-2, thus opening the cover 6-2. When the cover 6-2 is closed, the cover edge 6-2-1 of the cover 6-2 covers the outer periphery of the retaining edge of the support 6-1, and the cover body 6-2-2 covers the through groove 6-1-1, simultaneously blocking the through groove 6-1-1 and the operating hole 7.

[0034] In summary, the support 6-1 serves as the base for mounting the cover 6-2, and the support 6-1 is provided with a through groove 6-1-1 so that the operating hole 7 is exposed when the cover 6-2 is opened. The above is only an example of an optional embodiment. In other embodiments, the shape of the through groove 6-1-1 and the mounting plate 6-1-3 can be adapted to meet normal installation and ensure that the operating hole 7 is exposed when the cover 6-2 is opened.

[0035] like Figure 4 , Figure 5 As shown, to ensure that the latch 6-7 does not enter the lock groove 6-1-2 when the cover 6-2 is opened, a pressure plate 6-8 is installed on the cover 6-2. The pressure plate 6-8 is connected to the inner side of the cover body 6-2-2 through a reset elastic element 6-9, and can cooperate with the latch 6-7 to stop the rotation of the latch 6-7, thereby preventing the key 6-6 from being pulled out when the cover 6-2 is opened. To allow the latch 6-7 to enter the lock groove 6-1-2 when the cover 6-2 is closed, the lock groove 6-1-2 is set on the retaining edge 6-1-4 extending from the support 6-1 towards the cover 6-2. The retaining edge 6-1-4 is used to press the elastic pressure plate 6-8 to eliminate the anti-rotation effect of the pressure plate 6-8 on the latch 6-7.

[0036] Preferably, the aforementioned reset elastic elements 6-9 are compression springs, but spring sheets are also possible. When using a compression spring, to achieve a linear forward movement of the pressure plate when it is compressed, such as... Figure 4 , Figure 5As shown, a guide post 6-10 is connected to the inner end of the cover 6-2-2. The reset elastic element 6-9 and the pressure plate 6-8 are both sleeved on the guide post 6-10. When the cover 6-2 is closed, the pressure plate 6-8 moves in a straight line toward the cover edge 6-2-1 under the action of the guide post 6-10, thereby eliminating the anti-rotation effect of the pressure plate 6-8 on the locking tongue 6-7.

[0037] When the spring is used, both ends of the spring are connected to the cover 6-2-2, and the middle of the spring is connected to the pressure plate 6-8. When the cover 6-2 is closed, the flange 6-1-4 squeezes and deforms the spring, causing the pressure plate 6-8 to move toward the cover 6-2-2, thereby eliminating the anti-rotation effect of the pressure plate 6-8 on the latch 6-7.

[0038] In summary, the main function of the pressure plate 6-8 is to restrict the rotation of the latch 6-7 after the cover 6-2 is opened, thereby preventing the key 6-6 from being pulled out. The pressure plate 6-8 can move towards and away from the cover 6-2. During its movement, it can engage with the latch 6-7 to stop; this position can be defined as the stop position. When the pressure plate 6-8 moves to the position where it is separated from the latch 6-7, the latch 6-7 can rotate, allowing the key 6-6 to be pulled out; this position can be defined as the release position. The reset elastic element 6-9 refers to the elastic element that returns the pressure plate 6-8 to the stop position.

[0039] like Figure 1 , Figure 7 , Figure 11 and Figure 15 As shown, the key interlocking device also includes a bracket assembly 4 connected to the side plate 3. The bracket assembly 4 is equipped with a linkage component 5 that can move back and forth. The linkage component 5 is connected to the bracket assembly 4 through a driving elastic element 8 and can extend forward from the cabinet of the switch cabinet. On one side of the operating hole 7, the side plate 3 is also provided with a slot. The end of the linkage component 5 facing away from the driving elastic element 8 is guided by the slot and abuts against the cover 6-2.

[0040] During the opening and closing of the cover 6-2, due to the elastic force of the driving elastic element 8, the linkage component 5 can slide in a limited manner along the parallel direction of the operating shaft 2. When the cover 6-2 is opened, the key 6-6 is first rotated to drive the latch 6-7 out of the lock groove 6-1-2. Then, under the elastic force of the driving elastic element 8, the driving elastic element 8 unfolds to push the linkage component 5 forward, increasing the extension length of the linkage component 5 and keeping the end of the linkage component 5 abutting against the cover 6-2. When the cover 6-2 is closed, the cover 6-2 pushes the linkage component 5 backward to compress the driving elastic element 8, shortening the extension length of the linkage component 5. Then, the key 6-6 is rotated to drive the latch 6-7 to rotate and enter the lock groove 6-1-2 on the support 6-1.

[0041] like Figure 6 , Figure 9 and Figure 13As shown, the linkage component 5 is also equipped with a stop bar 5-4. The limit plate 9 on the operating shaft 2 cooperates with the stop bar 5-4 to allow or prevent the linkage component 5 from sliding in a limited manner. Specifically, the grounding switch 1 is switched between open and closed by rotating the operating shaft 2. When the operating shaft 2 is rotated, the limit plate 9 on the operating shaft 2 rotates with the operating shaft 2. In this way, when the operating shaft 2 rotates to the open position, the limit plate 9 rotates with the operating shaft 2 to the corresponding clearance position, so that the stop bar 5-4 can pass through the limit plate 9 to realize the forward and backward movement of the linkage component 5; when the operating shaft 2 rotates to the closed position, the limit plate 9 rotates with the operating shaft 2 to the corresponding stop position, so that the stop bar 5-4 can be blocked by the limit plate 9 to restrict the linkage component 5 to the blocking position, so as to prevent the linkage component 5 from retracting from the blocking position, thereby preventing the cover 6-2 from closing and preventing the key 6-6 on the cover 6-2 from being pulled out.

[0042] like Figures 9-12 As shown, when the grounding switch 1 is open and the cover 6-2 is open, under the action of the driving elastic element 8, the stop bar 5-4 is located in front of the limit plate 9; Figures 6-8 As shown, when the grounding switch 1 is open and the cover 6-2 is closed, the locking tongue 6-7 enters the locking groove 6-1-2, and the stop bar 5-4 is positioned behind the limit plate 9 under the pressure of the cover 6-2. Figures 13-16 As shown, when the grounding switch 1 is closed, the stop bar 5-4 is restricted in front of the limit plate 9 under the action of the driving elastic element 8 and the limit plate 9.

[0043] In general, the key 6-6 can only be pulled out to operate the circuit breaker to close or to open the compartment door when the grounding switch 1 is open and the cover 6-2 is closed. When the grounding switch 1 is closed, the cover 6-2 is prevented from closing by the elastic force of the driving elastic element 8 and the blocking action of the limit plate 9, thereby preventing the key 6-6 from being pulled out to operate other mechanisms. This effectively avoids the situation where personnel operate the circuit breaker to close or enter the compartment when the grounding switch 1 is closed, ensuring personal safety and the safe operation of the switchgear.

[0044] Preferably, the limiting plate 9 is a sector-shaped plate. When the grounding switch 1 is open, the sector-shaped plate rotates with the operating shaft 2 to the side of the operating rod opposite to the stop rod 5-4, allowing the stop rod 5-4 to pass through; when the grounding switch 1 is closed, the sector-shaped plate rotates with the operating shaft 2 to the side of the operating rod facing the stop rod 5-4, blocking the stop rod 5-4 from passing through, thus restricting the linkage component 5 to the blocking position. Of course, the limiting plate 9 may also be of other shapes, such as an irregularly shaped plate or a circular plate eccentrically arranged with respect to the operating shaft 2, as long as a corresponding notch is provided on the irregularly shaped plate or the circular plate on the operating shaft 2 at the position corresponding to the stop rod 5-4 when the operating shaft 2 rotates to the open state.

[0045] Preferably, follower plates 10 are respectively provided before and after the upper limit plate 9 of the operating shaft 2. When multiple follower plates 10 are provided, in addition to the upper limit plate 9, based on the driving elastic element 8 maintaining the limit position of the linkage component 5, the other follower plates 10 can further limit the limited sliding distance of the linkage component 5, and can also be connected to other components of the switch cabinet for position restriction.

[0046] Based on the above embodiments, as a preferred embodiment, to ensure that the cover 6-2 maintains abutting contact with the linkage component 5 throughout the entire opening and closing process, a baffle 6-4 is provided inside the cover body 6-2-2 of the cover 6-2. The baffle 6-4 has abutting top that maintains abutting contact with the linkage component 5 throughout its forward and backward movement. Specifically, by adding the baffle 6-4 inside the cover 6-2, the linkage component 5 moves forward or backward continuously and synchronously during the opening and closing process of the cover 6-2, ensuring that the abutting top of the baffle 6-4 maintains abutting contact with the linkage component 5 throughout its entire movement. Moreover, the baffle 6-4 increases the stroke of the linkage component 5 during the opening and closing process of the cover 6-2, ensuring that the cover 6-2 can open to a larger angle, thereby ensuring that the operating hole 7 is fully exposed, facilitating the operation of the grounding switch's operating shaft 2.

[0047] Preferably, to prevent interference between the baffle 6-4 and the rotating shaft 6-3 on the cover 6-2 during rotational opening and closing, a through hole is provided on the baffle 6-4 so that the rotating shaft 6-3 passes through the baffle 6-4. At this time, the rotation centers of the rotating shaft 6-3 and the baffle 6-4 coincide.

[0048] Preferably, for ease of manufacturing, the baffle 6-4 is a separate component, and the baffle 6-4 is bolted to the cover 6-2. Furthermore, the bolted connection facilitates disassembly; if the baffle 6-4 is deformed, damaged, or displaced, it can be replaced or its installation angle adjusted to re-engage the baffle 6-4 with the linkage assembly 5. Of course, it is also possible that an integral baffle 6-4 is directly installed on the inner side of the cover 6-2-2.

[0049] like Figure 6 , Figure 7 and Figure 8 As shown, when the grounding switch 1 is open and the cover 6-2 is closed, the baffle 6-4 on the cover 6-2 abuts against the end of the linkage component 5. At this time, the stop bar 5-4 on the linkage component 5 is located behind the limit plate 9 and is stopped in front of the first follower plate 10 located behind the limit plate 9; Figure 9 , Figure 10 , Figure 11 and Figure 12As shown, when the grounding switch 1 is open and the cover 6-2 is open, the baffle 6-4 on the cover 6-2 abuts against the end of the linkage component 5. At this time, the stop bar 5-4 on the linkage component 5 is located in front of the limit plate 9 and is stopped behind the follower plate 10 located in front of the limit plate 9; Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, when the grounding switch 1 is closed, the baffle 6-4 on the cover 6-2 abuts against the end of the linkage component 5. At this time, the stop bar 5-4 on the linkage component 5 is located in front of the limit plate 9 and is restricted to moving backward by the limit plate 9, thereby restricting the rotation of the baffle 6-4 and the cover 6-2, thereby preventing the cover 6-2 from closing and preventing the key 6-6 from being pulled out.

[0050] In other embodiments, it is also possible that the lid 6-2 directly engages with the linkage component 5 to prevent it from closing. In this case, there is no need to install a separate baffle 6-4. Instead, a flange is provided on the edge of the lid 6-2-2, and the flange on the lid 6-2-2 engages with the linkage component 5 to prevent the lid 6-2 from closing. However, during the process of opening the lid 6-2, it is necessary to manually use an auxiliary tool to press down the linkage component 5 first. After the lid 6-2 is fully opened, the linkage component 5 is released so that it moves forward under the action of the driving elastic element 8 to hold the lid 6-2 in place.

[0051] Based on the above preferred embodiments, as a more preferred embodiment, such as... Figure 4 , Figure 5 As shown, when setting the baffle 6-4, in order to ensure reliable abutment between the baffle 6-4 and the linkage component 5, a first abutment plane 6-4-1 and a second abutment plane 6-4-2 are provided on the baffle 6-4, and the first abutment plane 6-4-1 and the second abutment plane 6-4-2 are provided with transition surfaces. Specifically, the first abutment plane 6-4-1 abuts with the linkage component 5 when the lid 6-2 is open, and the second abutment plane 6-4-2 abuts with the linkage component 5 when the lid 6-2 is closed. The transition surfaces can be multiple planes or arc-shaped surfaces located between the first abutment plane 6-4-1 and the second abutment plane 6-4-2, used to abut with the linkage component 5 during the opening and closing of the lid 6-2. Compared to a completely curved surface, the first abutting plane 6-4-1 and the second abutting plane 6-4-2 allow the cover 6-2 to have a larger abutting contact area with the linkage component 5 in both the open and closed states, thereby further improving the reliability of the abutting fit between the cover 6-2 and the linkage component 5.

[0052] Based on any of the above embodiments, as a preferred embodiment, when setting the linkage component 5, to ensure a reliable abutting fit between the baffle 6-4 and the linkage component 5, as follows: Figure 1 , Figure 3As shown, the linkage component 5 is designed as a plate-like structure, with its plate surface parallel to both the operating shaft 2 of the grounding switch and the hinge axis of the cover 6-2. Specifically, the plate length of the linkage component 5 extends along the front-to-back direction, the plate thickness is set laterally, and the plate surface is set vertically. Compared to a shaft, for the same volume, the plate-like structure has a larger contact area between its end and the inner side of the cover 6-2. During the opening and closing of the cover 6-2, the plate-like structure can fully utilize the end area of ​​the linkage component 5, increasing the contact area for the abutment fit with the cover 6-2, and further improving the reliability of the abutment fit between the linkage component 5 and the cover 6-2.

[0053] Based on the above preferred embodiments, as a more preferred embodiment, when setting the linkage component 5, to further improve the reliability of the abutting fit between the linkage component 5 and the lid 6-2, such as... Figure 1 , Figure 3 As shown, the front end of the linkage component 5 is provided with a bent portion 5-5 that bends towards the support 6-1. Specifically, the bent portion 5-5 can increase the contact area when the linkage component 5 abuts against the cover 6-2, thereby increasing the friction between the cover 6-2 and the linkage component 5, and enhancing the resistance of the cover 6-2 against the linkage component 5. In other embodiments, it is not excluded that a stop member is connected to the end of the linkage component 5. For example, a plate-shaped stop member is welded to the end of the linkage component 5 to increase the reliability of the abutment fit between the cover 6-2 and the linkage component 5.

[0054] Based on the above preferred embodiment, as a more preferred embodiment, to facilitate the installation of the driving elastic element 8, a retaining edge is provided at the rear end of the linkage component 5, and the linkage component 5 passes through the bracket assembly 4 so that the retaining edge is located on the rear side of the bracket assembly 4. When the driving elastic element 8 is a tension spring, the tension spring is connected to the front end of the retaining edge and the rear end of the bracket assembly 4. In the natural state of the tension spring, the linkage component 5 is in a blocking position under the elastic action of the tension spring. When the cover 6-2 is closed, the cover 6-2 pushes the linkage component 5 backward to cause the tension spring to extend. To facilitate the connection of the linkage component 5 to the bracket assembly 4, preferably, the linkage component 5 includes a detachably connected front section and a rear section. First, the tension spring is connected to the rear section where the retaining edge is located, and then the front section is connected to the rear section. At this time, the tension spring is stopped between the retaining edge and the front section.

[0055] When the driving elastic element 8 is a compression spring, the linkage component 5 is provided with a stop edge located on the front side of the bracket component 4. The two ends of the compression spring contact the rear end of the stop edge and the front end of the bracket component 4, respectively. In the natural state of the compression spring, the linkage component 5 is in the blocking position under the elastic action of the compression spring. When the box cover 6-2 is closed, the box cover 6-2 pushes the linkage component 5 to move backward to compress the compression spring and make the stop edge abut against the bracket component 4.

[0056] Based on the above embodiments, as a preferred embodiment, such as... Figure 1 , Figure 3 As shown, the linkage component 5 includes a guide plate 5-1, an intermediate plate 5-2, and a transmission plate 5-3. The guide plate 5-1 and the transmission plate 5-3 are connected through the intermediate plate 5-2. The transmission plate 5-3, the intermediate plate 5-2, and the guide plate 5-1 are connected sequentially from front to back. The aforementioned retaining edge is provided on the guide plate 5-1, and the linkage component 5 is guided and engaged with the bracket assembly 4 through the guide plate 5-1. Specifically, the bracket assembly 4 is provided with a guide hole. First, the guide plate 5-1 is passed through the guide hole, the transmission plate 5-3 is passed through the side plate 3, and then the guide plate 5-1 and the transmission plate 5-3 are respectively connected to the intermediate plate. The split structure facilitates both the passage of the guide plate 5-1 through the guide hole of the bracket assembly 4 and the passage of the transmission plate 5-3, which has a bending part 5-5, through the operating hole 7 or the slot. The guide plate 5-1 passes through the guide hole on the bracket assembly 4 and can also provide guidance for the sliding of the linkage assembly 5. The stop bar 5-4 on the transmission plate 5-3 cooperates with the limit plate 9 on the operating shaft 2 to control the forward and backward movement of the linkage assembly 5. The front end of the transmission plate 5-3 cooperates with the cover 6-2 to transmit power for the movement of the linkage assembly 5.

[0057] It should be noted that in other embodiments, the linkage component 5 can also be a single plate-like structure. In this case, a bent portion 5-5 and a stop edge can also be provided.

[0058] Based on the above embodiments, as a preferred embodiment, such as... Figure 1 , Figure 2 As shown, to facilitate the connection of the linkage component 5 to the bracket assembly 4, the bracket assembly 4 includes an L-shaped plate 4-1. A rectangular groove 4-1-1 is provided on the short side of the L-shaped plate 4-1. The bracket assembly 4 is connected to the side plate 3 of the switch cabinet via the rectangular groove 4-1-1 and bolts. An opening groove 4-1-3 is provided on the long side of the L-shaped plate 4-1. An auxiliary plate 4-2 is superimposed on the long side of the L-shaped plate 4-1 to form a guide hole through which the guide plate 5-1 passes, enclosing the opening of the opening groove 4-1-3. Specifically, when the linkage component 5 consists of three parts, to facilitate connection with the bracket assembly 4, the linkage component 5 is first assembled into a whole, and then connected to the bracket assembly 4. In this embodiment, the bracket assembly 4 is composed of two connected parts. The linkage component 5 can be installed first in the opening groove 4-1-3 of the L-shaped plate 4-1, and then the auxiliary plate 4-2 is connected to the L-shaped plate 4-1.

[0059] Preferably, the auxiliary plate 4-2 and the L-shaped plate 4-1 are provided with two bolt holes on their long sides, and the auxiliary plate 4-2 is connected to the long side of the L-shaped plate 4-1 by bolts. The advantage of bolt connection is that it is easy to disassemble and will not cause deformation of the L-shaped plate 4-1. Of course, welding or snap-fit ​​connection of the auxiliary plate 4-2 and the L-shaped plate 4-1 is also possible.

[0060] To enhance the reliability of the bracket assembly 4 connected to the side plate 3, preferably, a clearance groove 4-1-2 for the operating shaft 2 is provided on the bracket assembly 4, and the groove opening of the clearance groove 4-1-2 is installed facing the side plate 3 so that the bracket assembly 4 can be connected to the side plate 3.

[0061] Based on the above embodiments, as a preferred embodiment, such as... Figure 1 , Figure 3 As shown, to facilitate the length adjustment of the linkage component 5, the guide plate 5-1, the intermediate plate 5-2, and the transmission plate 5-3 are all provided with elongated holes spaced apart along the length direction of the linkage component 5. The guide plate 5-1 and the intermediate plate 5-2, and the intermediate plate 5-2 and the transmission plate 5-3 are all connected by bolts. The bolt connection facilitates disassembly and assembly, and the elongated holes facilitate length adjustment. The length of the linkage component 5 can be adjusted according to the different sizes of switchgear to suit different switchgear.

[0062] Specific embodiments of the key interlocking device for the grounding switch provided by the present invention: The embodiment of the key interlocking device for the grounding switch is the same as the key interlocking device for the grounding switch described in the above-mentioned switch cabinet embodiment, and will not be described in detail here.

[0063] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A key interlocking device for a grounding switch, characterized in that, The lock box assembly includes a support for connection to the cabinet of the switch cabinet, a cover is hinged to the support, and the support has a through slot corresponding to the operating hole of the grounding switch so that the operating hole is exposed when the cover is opened. The box cover is equipped with a key-driven latch, and the support is equipped with a lock groove for the latch to enter. The inside of the box cover is equipped with a pressure plate that can move in the direction of approaching and moving away from the box cover. The pressure plate has a stop position for blocking the latch from rotating to prevent the key from being pulled out and a separation position for separating from the latch so that the latch can rotate. A reset elastic element is connected between the lid and the pressure plate to move the pressure plate to the stop position when the lid is opened; The support is provided with a stop for the pressure plate to move from the stop position to the separation position when the lid is closed; The interlocking device also includes a bracket assembly for fixing to the cabinet and a limit plate for fixing to the operating shaft of the grounding switch. The bracket assembly is provided with a linkage component that can move back and forth. The linkage component has a stop position that extends forward to block the box cover from closing. The linkage component is provided with a stop bar. In the closed state, the limit plate stops the stop bar to restrict the linkage component from retracting from the stop position. In the open state, the limit plate avoids the stop bar so that the linkage component can move back and forth. The linkage component is equipped with a driving elastic element to move the linkage component forward to the blocking position when the lid is opened.

2. The key interlocking device for the grounding switch according to claim 1, characterized in that, The lid includes a lid body, and a baffle is fixed on the inner side of the lid body. The baffle has a top that abuts against the moving parts throughout the entire process of their movement.

3. The key interlocking device for the grounding switch according to claim 2, characterized in that, The top surface includes a first abutting surface for engaging with the linkage component when the lid is open, a second abutting surface for engaging with the linkage component when the lid is closed, and a transition surface located between the first abutting surface and the second abutting surface.

4. The key interlocking device for the grounding switch according to any one of claims 1-3, characterized in that, The linkage component has a plate-like structure, and the plate surface of the linkage component is configured to be parallel to the operating axis of the grounding switch and the hinge axis of the cover when in use.

5. The key interlocking device for the grounding switch according to claim 4, characterized in that, The front end of the linkage component is provided with a bent part that bends towards the support side, and the bent part is used to make contact with the box cover.

6. The key interlocking device for the grounding switch according to claim 4, characterized in that, The linkage component has a stop edge located on the rear side of the bracket assembly, and the driving elastic element is a tension spring sleeved on the linkage component, with both ends of the tension spring connected to the front end of the stop edge and the rear end of the bracket assembly, respectively; or the linkage component has a stop edge located on the front side of the bracket assembly, and the driving elastic element is a compression spring sleeved on the linkage component, with both ends of the compression spring contacting the rear end of the stop edge and the front end of the bracket assembly, respectively.

7. The key interlocking device for the grounding switch according to claim 6, characterized in that, The linkage assembly includes a transmission plate, an intermediate plate, and a guide plate connected sequentially from front to back. The guide plate is guided and engaged with the bracket assembly, and the stop is provided on the guide plate.

8. The key interlocking device for the grounding switch according to claim 7, characterized in that, The bracket assembly includes a bracket for fixing to the cabinet and an auxiliary plate connected to the bracket. The bracket has an opening groove, and the auxiliary plate and the opening groove surround each other to form a guide hole that cooperates with the guide plate.

9. The key interlocking device for the grounding switch according to claim 7, characterized in that, The transmission plate, intermediate plate, and guide plate are connected in sequence by bolts. Each of the transmission plate, intermediate plate, and guide plate has through holes for the bolts to pass through, and the through holes are elongated holes extending along the length of each plate.

10. A switch cabinet, comprising a cabinet body, wherein a grounding switch operating mechanism is provided inside the cabinet body, the grounding switch operating mechanism comprising an operating shaft, and an operating hole for the grounding switch operating shaft is provided on the cabinet body, characterized in that... It also includes a key interlocking device for the grounding switch as described in any one of claims 1-9.

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