Door interlocking device

Abstract

The utility model discloses a door interlocking device, and belongs to the technical field of door interlocking. The locking device is arranged on an isolation frame and a cabinet door and comprises a locking bent plate, the locking bent plate is fixed to the inner side of the cabinet door and provided with a bayonet with a downward opening, a fulcrum pin shaft is fixedly installed on the isolation frame, an interlocking crank arm is rotationally connected to the fulcrum pin shaft, a locking pin is fixedly installed on the interlocking crank arm, and the locking pin is fixedly connected to the locking bent plate. The locking pin swings by taking the fulcrum pin shaft as a fulcrum, the locking pin is clamped into the bayonet, one end of the interlocking crank arm far away from the locking pin is rotatably connected with a connecting plate, the connecting plate is rotatably connected with a transmission crank arm sheet, the transmission crank arm sheet is rotatably connected to the isolation frame, and the transmission crank arm sheet is fixedly installed on the isolation switch operation shaft. The technical effect of preventing the cabinet door from being opened and personnel from mistakenly entering an electrified interval when the isolating switch is in a closed state is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of door interlocking, and more specifically, to a door interlocking device. Background Art

[0002] In the high-voltage electrical industry, as people pay more and more attention to the safety of electricity use, strict requirements are put forward for various possible illegal operations, and high-voltage electrical products must have perfect mechanical protection measures. In the past, some measures to prevent errors in electrical contacts and soft connection of wire ropes were adopted. Due to the reasons of the electrical components and the soft connection mode of wire ropes themselves, the prevention of errors often fails and causes accidents. Therefore, it is necessary to propose a purely mechanical interlocking device to solve the existing problems. In view of this, we propose a door interlocking device. Utility Model Content

[0003] The purpose of the present application is to provide a door interlock device, which solves the technical problems in the above-mentioned background technology and achieves the technical effect of preventing the cabinet door from being opened when the isolating switch is closed, and preventing people from mistakenly entering the energized interval.

[0004] The technical solution of the present application provides a door interlocking device, which is arranged on an isolation frame and a cabinet door, including: a locking bent plate, which is fixed on the inner side of the cabinet door and has a bayonet opening facing downward, a fulcrum pin shaft is fixedly installed on the isolation frame, a locking crank arm is rotatably connected to the fulcrum pin shaft, a locking pin is fixedly installed on the locking crank arm, the locking pin swings with the fulcrum pin shaft as a fulcrum, the locking pin is snapped into the bayonet, the end of the locking crank arm away from the locking pin is rotatably connected to a connecting plate, the connecting plate is rotatably connected to a transmission crank arm piece, the transmission crank arm piece is rotatably connected to the isolation frame, and the transmission crank arm piece is fixedly installed on the operating shaft of the isolation switch.

[0005] By adopting the above technical scheme, when the isolating switch is in the open state, the locking pin on the interlocking crank arm is stuck in the slot opened by the locking bent plate welded on the cabinet door. At this time, the cabinet door is in a locked state and cannot be opened; the isolating switch operating shaft rotates counterclockwise, and the transmission crank arm drives the interlocking crank arm to rotate clockwise around the fulcrum pin shaft through the connecting plate. At this time, the locking pin moves downward and disengages from the locking bent plate, and the cabinet door is unlocked. At this time, the isolating switch has been divided into the grounding position and the cabinet door can be opened with the door hinge as the axis. Conversely, the isolating switch operating shaft rotates clockwise to the isolating switch closed position, and the interlocking crank arm drives the locking pin to move upward and get stuck in the slot, so that the cabinet door is locked and cannot be opened.

[0006] As an optional solution to the technical solution of the present application document, the interlocking crank arm is a V-shaped plate structure with an obtuse inner angle.

[0007] By adopting the above technical solution, the V-point side of the locking arm is rotatably connected to the isolation frame through the fulcrum pin shaft, and through the V-shaped structural design of the locking arm, the locking arm can achieve rapid opening and closing of the locking pin and the bayonet at the minimum rotation angle compared to the straight plate structure.

[0008] As an optional solution of the technical solution of the present application document, the transmission crank arm piece is a cam-shaped structure, the transmission crank arm piece is fixedly mounted on the operating shaft of the isolating switch, and a hinge pin is installed between the transmission crank arm piece and the connecting plate.

[0009] By adopting the above technical solution, the hinge pin is fixed on the transmission crank arm piece, and the hinge pin passes through the upper end of the connecting plate to realize the rotational connection between the transmission crank arm piece and the connecting plate, and the cam-shaped structure of the transmission crank arm piece can withstand larger loads and impact loads.

[0010] As an optional solution of the technical solution of the present application document, a transmission pin is installed between the interlocking crank arm and the connecting plate.

[0011] By adopting the above technical solution, the connecting plate is fixedly installed with a transmission pin, and the transmission pin passes through the interlocking crank arm to realize the rotational connection between the interlocking crank arm and the connecting plate.

[0012] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0013] 1. The present application provides a simple and reliable mechanical interlocking method by abandoning the original wire rope soft connection interlocking mode and electrical contact interlocking mode, thereby solving the drawbacks of unreliable and easy failure of the interlocking between the disconnector and the switch cabinet door in the past, and has a simple structure and saves space;

[0014] 2. The present application uses an interlocking device to rotate the isolation operating shaft to drive the interlocking crank arm to rotate, so that the locking pin on the interlocking crank arm and the locking bent plate welded on the cabinet door realize the locking and unlocking process;

[0015] 3. The present application uses an interlocking device to achieve that as long as the isolating switch is in the closed state, the cabinet door will be locked by the locking pin and cannot be opened;

[0016] 4. The present application uses an interlocking device to achieve that only when the isolating switch is opened to the grounding position can the locking pin release the cabinet door lock and the cabinet door can be opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of an integral isolating switch in an open state of a door interlock device disclosed in a preferred embodiment of the present application;

[0018] Figure 2A schematic diagram of the structure of the overall isolating switch in the closed state of a door interlocking device disclosed in a preferred embodiment of the present application;

[0019] Figure 3 A schematic diagram of the front view structure of a locking arm of a door locking device disclosed in a preferred embodiment of the present application;

[0020] Figure 4 A schematic diagram of a top view of a locking arm of a door locking device disclosed in a preferred embodiment of the present application;

[0021] Figure 5 A schematic diagram of the right side structure of a cabinet door and a locking bent plate of a door interlocking device disclosed in a preferred embodiment of the present application;

[0022] Figure 6 This is a schematic diagram of the front view structure of a cabinet door and a locking bent plate of a door interlocking device disclosed in a preferred embodiment of the present application;

[0023] Explanation of the numbers in the figure: 1. Transmission pin; 2. Locking pin; 3. Locking bent plate; 301, bayonet; 4. Interlocking crank arm; 5. Fulcrum pin shaft; 6. Door hinge; 7. Cabinet door; 8. Isolation frame; 9. Connecting plate; 10. Hinge pin; 11. Transmission crank arm plate; 12. Isolation switch operating shaft. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the accompanying drawings.

[0025] A door interlocking device is arranged on an isolation frame 8 and a cabinet door 7, comprising: a locking bent plate 3, the locking bent plate 3 is fixed on the inner side of the cabinet door 7 and is provided with a bayonet 301 opening downward, a fulcrum pin 5 is fixedly installed on the isolation frame 8, a locking crank arm 4 is rotatably connected to the fulcrum pin 5, a locking pin 2 is fixedly installed on the locking crank arm 4, the locking pin 2 swings with the fulcrum pin 5 as a fulcrum, the locking pin 2 is snapped into the bayonet 301, the end of the locking crank arm 4 away from the locking pin 2 is rotatably connected to a connecting plate 9, the connecting plate 9 is rotatably connected to a transmission crank arm piece 11, the transmission crank arm piece 11 is rotatably connected to the isolation frame 8, and the transmission crank arm piece 11 is fixedly installed on the isolation switch operating shaft 12.

[0026] Reference Figure 1 - Figure 6When the isolating switch is in the open state, the locking pin 2 on the interlocking crank arm 4 is stuck in the bayonet 301 opened by the locking bent plate 3 welded on the cabinet door 7. At this time, the cabinet door 7 is in the locked state and the cabinet door 7 cannot be opened; the isolating switch operating shaft 12 rotates counterclockwise, and the transmission crank arm piece 11 drives the interlocking crank arm 4 to rotate clockwise around the fulcrum pin shaft 5 through the connecting plate 9. At this time, the locking pin 2 moves downward and disengages from the locking bent plate 3, and the cabinet door 7 is unlocked. At this time, the isolating switch has been divided into the grounding position and the cabinet door 7 can be opened with the door hinge 6 as the axis. Conversely, the isolating switch operating shaft 12 rotates clockwise to the isolating switch closed position, and the interlocking crank arm 4 drives the locking pin 2 to move upward and be stuck in the bayonet 301, so that the cabinet door 7 is locked and the cabinet door 7 cannot be opened.

[0027] The interlocking crank arm 4 is a V-shaped plate structure with an obtuse inner angle.

[0028] Reference Figure 1 - Figure 4 The V-point side of the locking arm 4 is rotatably connected to the isolation frame 8 through the fulcrum pin 5, and through the V-shaped structural design of the locking arm 4, the locking arm 4 can achieve rapid opening and closing of the locking pin 2 and the bayonet 301 at the minimum rotation angle compared with the straight plate structure.

[0029] The transmission crank arm piece 11 is a cam-shaped structure, and a hinge pin 10 is installed between the transmission crank arm piece 11 and the connecting plate 9.

[0030] Reference Figure 1 The hinge pin 10 is fixed on the transmission crank arm piece 11, and the hinge pin 10 passes through the upper end of the connecting plate 9 to realize the rotational connection between the transmission crank arm piece 11 and the connecting plate 9, and the cam-shaped structure of the transmission crank arm piece 11 can withstand larger loads and impact loads.

[0031] A transmission pin 1 is installed between the interlocking crank arm 4 and the connecting plate 9.

[0032] Reference Figure 1 and Figure 2 The connecting plate 9 is fixedly installed with the transmission pin 1, and the transmission pin 1 passes through the interlocking crank arm 4 to realize the rotation connection between the interlocking crank arm 4 and the connecting plate 9.

[0033] Working principle: When the isolating switch is in the open state, the locking pin 2 on the interlocking crank arm 4 is inserted into the bayonet 301 opened by the locking bent plate 3 welded on the cabinet door 7 (refer to Figure 2), at this time, the cabinet door 7 is in a locked state, and the cabinet door 7 will not be able to be opened; and when the isolating switch (the isolating switch operating shaft 12 rotates counterclockwise), the transmission crank arm piece 11 drives the interlocking crank arm 4 to rotate clockwise around the fulcrum pin shaft 5 through the connecting plate 9, and at this time the locking pin 2 moves downward to disengage from the locking bent plate 3, and the cabinet door 7 is unlocked. At this time, the isolating switch has been divided into the grounding position and the cabinet door 7 can be opened with the door hinge 6 as the axis; in the opposite operation, the isolating switch operating shaft 12 rotates clockwise to the isolating switch closed position, and the interlocking crank arm 4 drives the locking pin 2 to move upward and snap into the bayonet 301, so that the cabinet door 7 is locked, and the cabinet door 7 will not be able to be opened.

Claims

1. A door interlocking device, provided on an isolation frame (8) and a cabinet door (7), characterized in that: include: A locking bent plate (3), the locking bent plate (3) is fixed on the inner side of the cabinet door (7) and is provided with a bayonet (301) with an opening facing downwards, a fulcrum pin shaft (5) is fixedly mounted on the isolation frame (8), a locking crank arm (4) is rotatably connected to the fulcrum pin shaft (5), a locking pin (2) is fixedly mounted on the locking crank arm (4), the locking pin (2) swings with the fulcrum pin shaft (5) as a fulcrum, the locking pin (2) is snapped into the bayonet (301), the end of the locking crank arm (4) away from the locking pin (2) is rotatably connected to a connecting plate (9), the connecting plate (9) is rotatably connected to a transmission crank arm piece (11), the transmission crank arm piece (11) is rotatably connected to the isolation frame (8), and the transmission crank arm piece (11) is fixedly mounted on the isolation switch operating shaft (12).

2. A door interlocking device according to claim 1, characterized in that: The interlocking crank arm (4) is a V-shaped plate-like structure with an obtuse inner angle.

3. A door interlocking device according to claim 1, characterized in that: The transmission crank arm piece (11) is a cam-shaped structure. The transmission crank arm piece (11) is fixedly mounted on the isolating switch operating shaft (12). A hinge pin (10) is mounted between the transmission crank arm piece (11) and the connecting plate (9).

4. A door interlocking device according to claim 1, characterized in that: A transmission pin (1) is installed between the interlocking crank arm (4) and the connecting plate (9).

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