Interlocking device for back door and grounding switch of centrally installed switchgear

Abstract

The utility model discloses an interlocking device of a centrally installed switchgear rear door and a grounding switch. The interlocking device comprises a rear door interlocking mechanism and a grounding switch. The rear door interlocking mechanism comprises a rear door lock hook, an interlocking hook and an operating rod; and the grounding switch comprises a support fixedly connected with the cabinet wall and a rotating shaft rotationally matched with a shaft hole of the support. A limiting block is fixed to the rotating shaft, an eccentric protruding part is arranged on one side of the limiting block, and a flat iron welding block is arranged on the operating rod. When the eccentric protruding part of the limiting block is opposite to the flat iron welding block, the operating rod is locked, and the rear door cannot be opened. When the eccentric protruding part is far away from the flat iron welding block, the operating rod can move freely, and the rear door can be opened. According to the device, through a mechanical interlocking mode, the rear door can be opened only when the grounding switch is in a closed state, the operation safety and the interlocking reliability are improved, meanwhile, the structure is simplified, and maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrical cabinet, concretely is a kind of interlocking device of middle-placed cabinet rear door and grounding switch. BACKGROUND

[0002] In power system, middle-placed cabinet is widely used in power plant, transformer substation and industrial power distribution system as an important electrical equipment. In order to ensure the safety of staff and stable operation of power system, the design of middle-placed cabinet needs to consider various safety measures, and the interlocking mechanism of rear door and grounding switch is one of the keys.

[0003] The traditional interlocking mode of middle-placed cabinet rear door and grounding switch mainly adopts mechanical interlocking structure, the main purpose is to prevent the occurrence of electric shock accident caused by the misoperation of rear door when grounding switch is not closed (i.e. in the open state). However, the existing interlocking device has certain limitations, such as low interlocking reliability, complex structure and other problems, which affects the operation safety and use convenience of power equipment to some extent.

[0004] In addition, in the existing mechanical interlocking structure, the operating resistance of the limit block on the operating shaft is mainly given by the welding block on the operating rod of the rear door interlocking mechanism, instead of directly blocking and locking, so that the grounding switch cannot be opened, and the circuit breaker cannot enter the working position. However, this interlocking mode has great safety hazards, and the operator may mistakenly think that the operating force is not enough, and then increase the operating force, which may cause physical damage to the interlocking mechanism or forcibly open the grounding switch to continue power supply.

[0005] In order to solve the above problems, the present application provides a novel interlocking device of middle-placed cabinet rear door and grounding switch. CONTENT OF THE UTILITY MODEL

[0006] In view of the deficiencies in the background art, the utility model provides an interlocking device of middle-placed cabinet rear door and grounding switch.

[0007] The technical scheme adopted by the utility model is: an interlocking device of middle-placed cabinet rear door and grounding switch, comprising a rear door interlocking mechanism and a grounding switch, the rear door interlocking mechanism comprises a rear door lock hook, a interlocking hook and an operating rod, the grounding switch comprises a support fixedly connected with the cabinet wall and a rotating shaft matched with the shaft hole of the support, the operating rod passes through the slot of the support, the rotating shaft is fixed with a limit block, one side of the limit block has an eccentric protruding part, the operating rod is provided with a flat iron welding block on one side of the limit block, when the eccentric protruding part of the limit block is opposite to the flat iron welding block, the eccentric protruding part can resist the flat iron welding block to make the operating rod unable to move to the end of the limit block to open the rear door, when the eccentric protruding part of the limit block is away from the flat iron welding block, the operating rod can move forward and backward in the slot to open the rear door.

[0008] Further, the operating rod comprises a flat iron and a chain rod connected with the flat iron.

[0009] Further, the hook support fixedly connected with the cabinet wall, the hook shaft in telescopic cooperation with the through hole of the hook support, the compression spring sleeved on the hook shaft and the connecting plate connected with one end of the hook shaft are further included, the connecting plate is connected with the flat iron, one end of the compression spring is abutted against the compression spring step on the hook shaft, and the other end is abutted against the hook support, and the chain hook is rotationally connected with one end of the hook shaft.

[0010] Further, the middle part of the limiting block is provided with a connecting hole connected with the rotating shaft, and the two sides of the connecting hole are provided with fixing holes.

[0011] Further, the top of the operating rod is rotationally connected with a chain crank, one end of the chain crank away from the operating rod is connected with an operating hole baffle, and the middle part of the chain crank is rotationally connected with the pin shaft on the cabinet wall.

[0012] The utility model discloses the beneficial effect is:

[0013] 1. Improve security: through the interaction between the limiting block and the eccentric convex part and the operating rod, the eccentric convex part on the limiting block directly blocks the flat iron welding block, and only when the grounding switch is closed, the back door can be opened. This greatly reduces the risk of electric shock caused by misoperation, and protects the personal safety of the operator.

[0014] 2. Enhance interlocking reliability: the application adopts mechanical structure to realize interlocking function, avoids the problems of high failure rate and easy to be disturbed by environmental factors of electronic interlocking. The mechanical interlocking mode is more stable and reliable, and is suitable for various harsh working environments.

[0015] 3. Simplify structure, easy to maintain: compared with the traditional interlocking device, the structure of the application is more simple, unnecessary parts are reduced, the manufacturing cost is reduced, and the daily maintenance and repair work is also facilitated. Users can quickly troubleshoot, reduce equipment downtime.

[0016] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. The utility model will be further described in detail below with reference to the drawings. DRAWINGS

[0017] Figure 1 It is the schematic view of the connection of interlocking device and cabinet wall.

[0018] Figure 2 It is Figure 1 It is the enlarged schematic view of A in the middle.

[0019] Figure 3 Figure 6 is a schematic view of the interlocking device and the other perspective view of the cabinet wall.

[0020] Figure 4 Figure 7 is a schematic view of one end of the grounding operation hole.

[0021] Figure 5 Figure 8 is a schematic view of one end of the interlocking hook.

[0022] Figure 6 Figure 9 is a schematic view of the structure of the interlocking device.

[0023] Figure 7 Figure 10 is a schematic view of the eccentric protruding part of the limiting block and the flat iron welding block.

[0024] Figure 8 Figure 11 is a schematic view of the eccentric protruding part of the limiting block and the flat iron welding block.

[0025] Figure 9 Figure 12 is a schematic view of the structure of the limiting block.

[0026] Figures 1-9 Figure 13 is a schematic view of the interlocking device of the middle cabinet door and the grounding switch. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0028] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0029] The interlocking device of the middle cabinet door and the grounding switch is provided.

[0030] In the present embodiment, reference is made to Figures 1-9The interlocking device of the middle cabinet rear door and the grounding switch comprises a rear door interlocking mechanism and a grounding switch, the rear door interlocking mechanism comprises a rear door lock hook 1, a interlocking hook 2 and an operating rod 3, the grounding switch comprises a support 5 fixedly connected with a cabinet wall 4 and a rotating shaft 6 in rotation with an axial hole of the support 5, the operating rod passes through a slot 7 of the support, a limiting block 8 is fixed on the rotating shaft, one side of the limiting block 8 is provided with an eccentric protruding part 9, and a flat iron welding block 10 is arranged on one side of the operating rod, when the eccentric protruding part of the limiting block is opposite to the flat iron welding block, the eccentric protruding part can abut against the flat iron welding block to prevent the operating rod from moving to one end of the limiting block to open the rear door, and when the eccentric protruding part of the limiting block is away from the flat iron welding block, the operating rod can move back and forth in the slot to open the rear door.

[0031] In the technical scheme, the limiting block with the eccentric protruding part is arranged on the rotating shaft, so that the rear door can be opened only when the grounding switch is closed, and safety accidents caused by misoperation are effectively prevented.

[0032] In specific use, when the grounding switch is opened, the eccentric protruding part of the limiting block is opposite to the flat iron welding block (as shown in FIG. 4), the operating rod is blocked by the limiting block, and the rear door cannot be opened; when the grounding switch is closed (the limiting block is rotated by the rotating shaft), the eccentric protruding part of the limiting block is away from the flat iron welding block (as shown in FIG. 5), and the rear door can be normally opened. Figure 7 Figure 8

[0033] Specifically, the operating rod comprises a flat iron 11 and a interlocking rod 12 connected with the flat iron 11.

[0034] Specifically, the interlocking device further comprises a hook support 13 fixedly connected with the cabinet wall, a hook shaft 15 in telescopic cooperation with a through hole 14 of the hook support 13, a compression spring 16 sleeved on the hook shaft 15 and a connecting plate 17 connected with one end of the hook shaft, the connecting plate 17 is connected with the flat iron, one end of the compression spring abuts against a compression spring step 18 on the hook shaft, and the other end abuts against the hook support, and the interlocking hook is rotationally connected with one end of the hook shaft.

[0035] The compression spring can provide buffering when the operating rod moves, so as to reduce impact force and further improve the safety of the interlocking device.

[0036] Specifically, the limiting block has a connecting hole 19 in the middle and fixing holes 20 on both sides of the connecting hole 19.

[0037] The connecting hole in the middle of the limiting block and the fixing holes on both sides ensure firm connection of the limiting block with the rotating shaft, and the limiting block can be fixed on the rotating shaft by bolts, so that the limiting block can rotate with the rotating shaft when the rotating shaft rotates. ​​

[0038] Specifically, the top of the operating lever is rotationally connected with a linkage arm 21, one end of the linkage arm 21 is connected with an operating hole baffle 22, and the middle of the linkage arm is rotationally connected with a pin shaft 23 on the cabinet wall.

[0039] In the above technical solution, when the rear door is opened, i.e. the operating lever moves to one end of the rear door lock hook, at this time, the operating hole baffle is put down by driving the linkage arm, so as to block the grounding operating hole. On the contrary, when the operating lever moves to the other end away from the rear door lock hook, the operating hole baffle is lifted to release the grounding operating hole. Thus, when the rear door is not closed, the grounding operating hole is covered by the operating hole baffle and cannot be operated. The grounding operating hole is opened only when the rear door is closed, and the grounding operating hole can be operated, thereby improving the operation safety.

[0040] Skilled persons should know that although the utility model has been described according to the above specific implementation mode, the utility model idea is not limited to the utility model, and any modification using the utility model idea will be included in the patent protection range.

Claims

1. An interlocking device for the rear door of a cubicle and the grounding switch, comprising a rear door interlocking mechanism and a grounding switch, the rear door interlocking mechanism comprising a rear door lock hook, a lock hook and an operating rod, the grounding switch comprising a support fixed to the wall of the cubicle and a rotating shaft matched with the shaft hole of the support, the operating rod passing through the slot of the support, characterized in that: The rotary shaft is fixed with a limiting block, one side of the limiting block has an eccentric convex part, the operating rod is provided with a flat iron welding block on one side of the limiting block, when the eccentric convex part of the limiting block is opposite to the flat iron welding block, the eccentric convex part can resist the flat iron welding block so that the operating rod cannot move to one end of the limiting block to open the back door, when the eccentric convex part of the limiting block is away from the flat iron welding block, the operating rod can move forward and backward in the slot to open the back door.

2. The interlock device of the grounding switch and the rear door of the cubicle according to claim 1, characterized in that: The operating rod comprises a flat iron and a chain link rod connected with the flat iron.

3. The interlock device of the grounding switch and the rear door of the cubicle according to claim 2, characterized in that: Further comprising a hook support fixedly connected with the cabinet wall, a hook shaft telescopic matched with the through hole of the hook support, a compression spring sleeved on the hook shaft, and a connecting plate connected with one end of the hook shaft, the connecting plate is connected with the flat iron, one end of the compression spring is abutted against the compression spring step on the hook shaft, and the other end is abutted against the hook support, the chain link hook is rotationally connected with one end of the hook shaft.

4. The interlock device for the rear door of the cubicle with the grounding switch according to claim 1, characterized in that: The limiting block has a connecting hole connected with the rotary shaft in the middle, and the connecting hole is provided with fixing holes on both sides.

5. The interlock device of the grounding switch and the rear door of the metal-clad cabinet according to any one of claims 1-4, characterized in that: The top of the operating rod is rotationally connected with a chain link crank, one end of the chain link crank away from the operating rod is connected with an operating hole baffle, and the middle of the chain link crank is rotationally connected with a pin shaft on the cabinet wall.

Images