Switch cabinet rear door mechanical locking device

Abstract

The utility model relates to the technical field of switch cabinets, in particular to a mechanical locking device for a rear door of a switch cabinet, and solves the problems that a switch cabinet door can still be opened after a grounding switch of the switch cabinet is switched off, and a circuit breaker can be switched on to supply power after the grounding switch is switched off, so that a cable chamber compartment is electrified; and personal safety of operators is harmed. According to the technical scheme, a driving mechanism drives a grounding switch shaft to rotate to realize closing and opening; the driving mechanism is used for locking the grounding switch shaft when the cabinet door is opened and unlocking the grounding switch shaft when the cabinet door is closed; according to the utility model, when the circuit breaker is in a test position, the grounding switch is in a switch-on state and the cabinet door of the switch cabinet is closed, the locking mechanism locks the cabinet door, and the cabinet door cannot be opened even if the switch is switched off, thereby achieving the purpose of preventing an operator from mistakenly entering an electrified interval.

Description

Technical Field

[0001] The utility model relates to the technical field of switch cabinets, in particular to a mechanical locking device for a rear door of a switch cabinet. Background Art

[0002] The grounding interlock device in the existing switch cabinet can still open the switch cabinet door after the grounding switch is closed due to manufacturing and assembly factors, which may cause the grounding switch to open after the grounding switch is closed. At this time, since the grounding switch is opened, the circuit breaker can be closed and power can be supplied, making the cable compartment energized, endangering the personal safety of operators. Utility Model Content

[0003] The purpose of the utility model is to solve the technical problem in the prior art that the switch cabinet door can still be opened after the grounding switch of the switch cabinet is opened. At this time, since the circuit breaker can be closed and power can be supplied after the grounding switch is opened, the cable room compartment is energized, which endangers the personal safety of the operator.

[0004] To achieve the above-mentioned object, the present invention adopts the following technical solution: a mechanical locking device for the rear door of a switch cabinet, comprising: a cabinet body, a grounding switch main shaft is arranged in an area near the cabinet door inside the cabinet body, and a locking mechanism and a driving mechanism are arranged at one end of the grounding switch main shaft;

[0005] The driving mechanism is used to drive the grounding switch shaft to rotate to achieve closing and opening; the driving mechanism is used to lock the grounding switch main shaft when the cabinet door is open, and unlock the grounding switch main shaft when the cabinet door is closed.

[0006] Furthermore, the locking mechanism includes: a locking block, which is arranged on the main shaft of the grounding switch; an L-shaped shaft is arranged parallel to the bottom of the locking block, the vertical part of the L-shaped shaft is in contact with the locking block, and the horizontal part extends outward from the cabinet body; the L-shaped shaft is slidably connected to the bracket, the bracket is connected to the cabinet body, and a spring is sleeved on the outer surface of the horizontal part of the L-shaped shaft; the spring is connected to the L-shaped shaft at one end close to the cabinet door and to the bracket at one end away from the cabinet door; the main shaft of the grounding switch serves as the main grounding switch, and adopts existing technology to connect with the grounding wire, live parts and other components in the switch cabinet to achieve grounding, and realizes closing and opening by rotation.

[0007] Furthermore, the locking mechanism also includes: a lock hook, which is arranged on the main shaft of the grounding switch. When the cabinet door is closed, a lock buckle is provided on the cabinet door corresponding to the lock hook area; the lock hook can hook the lock buckle to fix the cabinet door.

[0008] Furthermore, the driving mechanism includes: a grounding operating shaft, which is arranged in the cabinet, the grounding operating shaft is connected to the connecting rod through a lower crank arm, and the end of the connecting rod away from the grounding operating shaft is connected to the grounding switch main shaft through an upper crank arm. Through the cooperation of the connecting rod mechanism, the grounding operating shaft is rotated to drive the grounding switch shaft to rotate.

[0009] Furthermore, the grounding operation axis and the grounding switch main axis are not on the same horizontal line.

[0010] Furthermore, the end of the grounding operation shaft is connected to the cabinet through a lower support plate.

[0011] Furthermore, a connecting plate is provided on the bracket, a hole is provided on the connecting plate, and the horizontal part of the L-shaped shaft passes through the connecting plate.

[0012] Compared with the prior art, the advantages and positive effects of the present invention are:

[0013] 1. The utility model provides a mechanical locking device for the rear door of a switch cabinet. When the circuit breaker is in the test position, the earthing switch is in the closed state, and the switch cabinet door is closed, the cabinet door abuts against one end of the L-shaped shaft, causing the L-shaped shaft to move into the cabinet. At this time, the vertical part of the L-shaped shaft no longer contacts the locking block, allowing the main shaft of the earthing switch to rotate. The operating shaft rotates 180° counterclockwise, and the lower crank arm, connecting rod, and upper crank arm drive the main shaft of the earthing switch to rotate 90° to achieve opening. The rotation of the main shaft of the earthing switch drives the lock hook to rotate together, and the lock hook hooks the lock catch, so that the cabinet door cannot be opened after the earthing switch is in the open position. When the rear door of the switch cabinet is not completely or not closed, the rear door of the switch cabinet is locked. When the door does not fully open the L-shaped shaft, the L-shaped shaft continues to limit the locking block, making it impossible for the grounding switch main shaft to rotate and unable to open the circuit breaker. This avoids the use of umbrella-shaped teeth in the operating shaft of the grounding switch in the prior art. The umbrella-shaped teeth are easily worn during operation, causing the gap between the teeth to increase, which easily causes the teeth to slip. During operation, there is a risk that the operating shaft is displayed in place but the actual grounding switch is not in place, reducing operational reliability. This ensures that the switch cabinet remains in a closed state when opening the circuit breaker, preventing operators from accidentally entering the live interval. Therefore, when the rear door is not closed in place, the grounding switch cannot be opened, and the circuit breaker trolley cannot be swing into the working position, preventing live body grounding faults.

[0014] 2. The utility model provides a mechanical locking device for the rear door of a switch cabinet. When maintenance is required, the grounding switch is in the open state, the circuit breaker retreats from the working position to the test position, and the grounding operating shaft rotates 180° clockwise. The lower crank arm assembly, the connecting rod, and the upper crank arm assembly drive the grounding switch main shaft to rotate 90° to achieve closing. At this time, the rotation of the grounding switch main shaft drives the lock hook to disengage the lock catch, and the cabinet door can be opened. The L-shaped shaft is reset under the action of the spring, limiting the locking block to prevent the grounding switch main shaft from rotating, causing the grounding switch to be opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of a mechanical locking device for the rear door of a switch cabinet provided by the utility model after the cabinet door is closed;

[0017] Figure 2 The utility model provides a switch cabinet rear door mechanical locking device Figure 1 Enlarged view of point B;

[0018] Figure 3 This is a schematic diagram of the overall structure of a mechanical locking device for the rear door of a switch cabinet provided by the utility model after the cabinet door is opened;

[0019] Figure 4 The utility model provides a switch cabinet rear door mechanical locking device Figure 3 Enlarged view of point C;

[0020] Figure 5 This is a schematic diagram of the lock block structure of a mechanical locking device for a switch cabinet rear door provided by the utility model, which is blocked by an upper crank arm;

[0021] Figure 6 The utility model provides a switch cabinet rear door mechanical locking device Figure 5 Enlarged view of point D;

[0022] Figure 7 The utility model provides a switch cabinet rear door mechanical locking device Figure 1 A-direction view.

[0023] Legend:

[0024] 1. Locking block; 2. Earthing switch main shaft; 3. L-shaped shaft; 4. Cabinet body; 5. Bracket; 6. Spring; 7. Cabinet door; 8. Lock hook; 9. Lock catch; 10. Earthing operating shaft; 11. Lower turning arm; 12. Connecting rod; 13. Upper turning arm; 14. Lower support plate; 15. Connecting plate. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] Example 1:

[0027] See also Figures 1 to 7 The present invention provides a mechanical locking device for the rear door of a switch cabinet, comprising a cabinet body 4, wherein a grounding switch main shaft 2 is provided in an area near a cabinet door 7 inside the cabinet body 4, and a locking mechanism and a driving mechanism are provided at one end of the grounding switch main shaft 2;

[0028] The driving mechanism is used to drive the grounding switch shaft to rotate to achieve closing and opening; the driving mechanism is used to lock the grounding switch main shaft 2 when the cabinet door 7 is opened, and unlock the grounding switch main shaft 2 when the cabinet door 7 is closed.

[0029] When the circuit breaker is in the test position, the earthing switch is in the closed state, and the switch cabinet door 7 is closed, the locking mechanism locks the cabinet door 7. At this time, even if the switch is opened, the cabinet door 7 cannot be opened, thereby preventing the operator from accidentally entering the live interval.

[0030] In this embodiment, the locking mechanism includes: a locking block 1 mounted on the grounding switch main shaft 2; an L-shaped shaft 3 mounted parallel to and below the locking block 1, the vertical portion of the L-shaped shaft 3 contacting the locking block 1 and the horizontal portion extending outward from the cabinet 4; the L-shaped shaft 3 slidably connected to a bracket 5 connected to the cabinet 4; a spring 6 sleeved on the outer surface of the horizontal portion of the L-shaped shaft 3; the spring 6 connected to the L-shaped shaft 3 at one end proximal to the cabinet door 7 and to the bracket 5 at the end distal to the cabinet door 7; the locking mechanism also includes: a lock hook 8 mounted on the grounding switch main shaft 2; a lock catch 9 is provided on the cabinet door 7 in an area corresponding to the lock hook 8 when the cabinet door 7 is closed; and a driving mechanism includes: a grounding operating shaft 10 mounted within the cabinet 4, the grounding operating shaft 10 connected to a connecting rod 12 via a lower crank arm 11; the connecting rod 12 connected to the grounding switch main shaft 2 at its end distal to the grounding operating shaft 10 via an upper crank arm 13.

[0031] When the circuit breaker is in the test position and the earthing switch is in the closed state, the switch cabinet door 7 is closed, the cabinet door 7 is against one end of the L-shaped shaft 3, so that the L-shaped shaft 3 moves into the cabinet. At this time, the vertical part of the L-shaped shaft 3 no longer contacts the locking block 1, so that the grounding switch main shaft 2 can rotate, and the grounding operating shaft 10 is operated to rotate 180° counterclockwise. The lower crank arm 11, the connecting rod 12, and the upper crank arm 13 drive the grounding switch main shaft 2 to rotate 90° to achieve opening. The rotation of the grounding switch main shaft 2 drives the lock hook to rotate together, and the lock hook hooks the lock buckle 9, so that the cabinet door 7 cannot be opened after the grounding switch is in place. When the rear door of the switch cabinet is not completely or not closed, the rear door of the switch cabinet is not completely pushed up. The L-shaped shaft 3 is opened, and the L-shaped shaft 3 continues to limit the locking block 1, so that the grounding switch main shaft 2 cannot rotate and the circuit breaker cannot be opened. This avoids the prior art that the grounding switch operating shaft adopts umbrella-shaped gear engagement. During operation, the umbrella-shaped gear is easy to wear, resulting in an increase in the gap between the teeth, which easily causes the gear engagement to slip. During operation, there is a risk that the operating shaft is displayed in place but the actual grounding switch is not in place, which reduces the operational reliability. This ensures that when opening the circuit breaker, the switch cabinet remains in the closed state, preventing the operator from mistakenly entering the live compartment. Therefore, when the rear door is not closed in place, the grounding switch cannot be opened, and the circuit breaker trolley cannot be swing into the working position, preventing the live body from grounding fault.

[0032] When maintenance is required, the grounding switch is in the open state, the circuit breaker retreats from the working position to the test position, the grounding operating shaft 10 rotates 180° clockwise, and the grounding switch main shaft 2 is driven to rotate 90° through the lower turning arm 11 assembly, the connecting rod 12, and the upper turning arm 13 assembly to achieve closing. At this time, the grounding switch main shaft 2 rotates to drive the lock hook to disengage the lock catch 9, so that the cabinet door 7 can be opened, and the L-shaped shaft 3 is reset under the action of the spring 6 to limit the locking block to prevent the grounding switch main shaft 2 from rotating, causing the grounding switch to be opened.

[0033] In this embodiment, the grounding operation shaft 10 and the grounding switch main shaft 2 are not located on the same horizontal line.

[0034] The operating shaft of the grounding switch is at the same horizontal height as the main shaft and is driven by a loose tooth mechanism. The existing lower branch row of the circuit breaker chamber cannot meet the 300mm air clearance for the operating shaft, and composite insulation needs to be installed. The present application uses a connecting rod 12 to stagger the operating shaft of the grounding switch and the main shaft 2 of the grounding switch, and not on the same horizontal plane, thereby increasing the distance between the grounding switch terminal connection row and the grounding operating shaft 10. Air insulation is completely adopted without composite insulation, thereby improving the safety performance of the switchgear.

[0035] In this embodiment, the end of the grounding operating shaft 10 is connected to the cabinet 4 through the lower support plate 14. By providing the lower support plate 14, the grounding operating shaft 10 is rotatably connected to the grounding plate, thereby ensuring the stability of the grounding operating shaft 10.

[0036] Example 2:

[0037] Different from the above embodiment, in this embodiment, a connecting plate 15 is provided on the bracket 5 , and a hole is provided on the connecting plate 15 , and the horizontal portion of the L-shaped shaft 3 passes through the connecting plate 15 .

[0038] By providing the connecting plate 15 , the L-shaped shaft 3 passes through the connecting plate 15 and is rotatably connected to the connecting plate 15 , thereby ensuring the stability of the L-shaped shaft 3 during movement.

[0039] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A mechanical locking device for the rear door of a switch cabinet, characterized in that: include: A cabinet body (4), wherein a grounding switch main shaft (2) is provided in an area near the cabinet door (7) inside the cabinet body (4), and a locking mechanism and a driving mechanism are provided at one end of the grounding switch main shaft (2); The driving mechanism is used to drive the grounding switch shaft to rotate to achieve closing and opening; the driving mechanism is used to lock the grounding switch main shaft (2) when the cabinet door (7) is opened, and to unlock the grounding switch main shaft (2) when the cabinet door (7) is closed.

2. The mechanical locking device for the rear door of a switch cabinet according to claim 1, characterized in that: The locking mechanism comprises: a locking block (1) arranged on the main shaft (2) of the grounding switch; an L-shaped shaft (3) is arranged parallel to the bottom of the locking block (1); the vertical portion of the L-shaped shaft (3) contacts the locking block (1), and the horizontal portion extends outward from the cabinet (4); the L-shaped shaft (3) is slidably connected to a bracket (5), the bracket (5) is connected to the cabinet (4), and a spring (6) is sleeved on the outer surface of the horizontal portion of the L-shaped shaft (3); the spring (6) is connected to the L-shaped shaft (3) at one end close to the cabinet door (7), and is connected to the bracket (5) at one end away from the cabinet door (7).

3. The mechanical locking device for the rear door of a switch cabinet according to claim 2, characterized in that: The locking mechanism further comprises: a lock hook (8) arranged on the grounding switch main shaft (2); when the cabinet door (7) is closed, a lock catch (9) is arranged on the cabinet door (7) in an area corresponding to the lock hook (8).

4. The mechanical locking device for the rear door of a switch cabinet according to claim 3, characterized in that: The driving mechanism comprises: a grounding operating shaft (10) arranged in a cabinet (4); the grounding operating shaft (10) is connected to a connecting rod (12) via a lower crank arm (11); and the connecting rod (12) is connected to a grounding switch main shaft (2) via an upper crank arm (13) at one end away from the grounding operating shaft (10).

5. The mechanical locking device for the rear door of a switch cabinet according to claim 4, characterized in that: The grounding operating shaft (10) and the grounding switch main shaft (2) are not located on the same horizontal line.

6. The mechanical locking device for the rear door of a switch cabinet according to claim 5, characterized in that: The end of the grounding operating shaft (10) is connected to the cabinet (4) via a lower support plate (14).

7. The mechanical locking device for the rear door of a switch cabinet according to claim 2, characterized in that: The bracket (5) is provided with a connecting plate (15), the connecting plate (15) is provided with a hole, and the horizontal portion of the L-shaped shaft (3) passes through the connecting plate (15).

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