Grounding protection device for mining explosion-proof high-voltage power distribution device

Abstract

A mining explosion-proof high-voltage power distribution device grounding protection device comprises a housing, circuit breakers distributed and installed in the housing, a door plate capable of being opened and closed and installed on the front end face of the housing, a lock rod installed on the door plate, and interlocking angle steel installed on a single circuit breaker through a fastener, and further comprises a grounding switch operation shaft, the head of which is provided with an opening, the tail part of the grounding switch operation shaft passes through the door plate and then is connected with the lock rod. A grounding switch assembly is further fixedly installed in the shell, a first rocker arm is hinged to the grounding switch assembly, a grounding switch operation shaft is sleeved with a second rocker arm, and a connecting rod is installed between the first rocker arm and the second rocker arm. According to the utility model, the safety hidden trouble in the prior art is completely eradicated, the load grounding switch is additionally arranged in the main cavity and below the static contact, the on-off of the grounding switch is carried out in the explosion-proof cavity, the phenomenon of explosion loss is avoided, meanwhile, reliable interlocking is arranged between the grounding switch and the circuit breaker, the occurrence of misoperation is prevented, and the hidden trouble of hanging a ground wire is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of protection devices, in particular to a grounding protection device for a mine flameproof high-voltage power distribution device. Background Art

[0002] The explosion-proof and intrinsically safe high-voltage vacuum distribution device for mining (hereinafter referred to as the high-explosive switch) is an essential switchgear for underground coal mine power supply. It typically includes primary equipment (voltage transformer (PT), current transformer (CT), zero-sequence current transformer), protectors, and circuit breakers. The circuit breaker includes a closing circuit, a closing actuator, an opening circuit, an opening actuator, a pressure-free release tripping circuit, a tripping actuator, and a circuit breaker trolley. The high-explosive switch is used to interrupt and restore power to power supply equipment. If a fault such as leakage or short circuit occurs on the load side of the power-consuming equipment, the protector in the high-explosive switch detects the fault and issues a fault trip command, causing the switch to trip and eliminate the fault.

[0003] The original high-explosive switch was not equipped with a grounding switch assembly because no components are allowed to be installed in the wiring chamber. Therefore, the high-explosive switch has always maintained the original design of the product. For example, there is no grounding switch on the load side. When repairing the load, the traditional explosion-proof product can only open the break of the circuit breaker trolley during power outage and maintenance, and then the grounding wire needs to be hung on the load side. To complete the process of hanging the grounding wire, you must first open the explosion-proof cover of the cable room. When the explosion-proof cabinet is used underground, it is generally connected to the load with a cable. When the explosion-proof cover of the cable room is opened, the grounding wire is hung, the cable capacitor, or other energy storage electrical components will produce sparks and cause a gas explosion, which is a huge potential accident hazard. Utility Model Content

[0004] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a grounding protection device for a mine flameproof high-voltage distribution device. In order to eliminate the safety hazards in the existing technology, a load grounding switch is installed below the static contact in the main cavity. The closing and opening of the grounding switch are both carried out in the flameproof cavity, and no explosion failure will occur. At the same time, there is a reliable interlock between the grounding switch and the circuit breaker to prevent the occurrence of misoperation, thereby solving the hidden danger of hanging ground wires.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A grounding protection device for a flameproof high-voltage power distribution device for mining includes a housing, a circuit breaker is installed in the interior of the housing, an openable and closable door panel is installed on the front face of the housing, a locking rod is installed on the door panel, and a lock block that cooperates with the locking rod is installed on the housing beside the door panel;

[0007] An interlocking angle steel is mounted on a single circuit breaker via fasteners. The circuit breaker also includes an earthing switch operating shaft that matches the interlocking angle steel. The head of the earthing switch operating shaft is provided with an opening that corresponds to the interlocking angle steel. The tail of the earthing switch operating shaft passes through the door panel and is connected to the locking rod.

[0008] A grounding switch assembly is also fixedly installed inside the shell. A No. 1 rocker arm is hinged on the grounding switch assembly. A No. 2 rocker arm is sleeved on the grounding switch operating shaft. A connecting rod is installed between the No. 1 rocker arm and the No. 2 rocker arm.

[0009] As a further improvement of the above technical solution:

[0010] The grounding switch operating shaft is an integrated structure.

[0011] When the grounding switch operating shaft trolley is in the working position, the interlocking angle steel is clamped in the opening and the grounding switch operating shaft cannot rotate; when the grounding switch operating shaft trolley is in the testing position, the interlocking angle steel is disengaged from the opening and the grounding switch operating shaft can rotate.

[0012] The grounding switch operating shaft is provided with multiple steps.

[0013] The No. 2 rocker arm has a large hole at one end and a small hole at the other end. The large hole matches the operating shaft of the grounding switch, and the small hole matches the connecting rod.

[0014] The interlocking angle steel is an integrated structure.

[0015] A plurality of locking holes are opened on a right angle side of the interlocking angle steel, which is fixed to the circuit breaker through fasteners, and the other right angle side of the interlocking angle steel cooperates with the operating shaft of the grounding switch.

[0016] The grounding switch assembly is provided with a grounding switch blade.

[0017] The two groups of circuit breakers are distributed up and down inside the shell.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model has a compact and reasonable structure and is easy to operate. Through the mutual cooperation between the components and mechanisms such as the grounding switch assembly, the four-bar mechanism, the grounding switch operating shaft and the rocker arm, the switching action of the circuit breaker between the trolley test position and the trolley working position can be conveniently completed. The movement is sensitive and reliable, and the overall operation is simple. The closing and opening of the grounding switch are all carried out in the flameproof chamber, and the explosion failure phenomenon will not occur. At the same time, there is a reliable interlock between the grounding switch and the circuit breaker to prevent the occurrence of misoperation, thereby solving the hidden danger of hanging the ground wire.

[0020] When the trolley is in the working position, the interlocking angle steel on the circuit breaker is stuck in the top opening of the grounding switch operating shaft. At this time, the grounding switch cannot rotate the grounding switch operating shaft because the operating shaft and the interlocking angle steel are engaged together. When the trolley is retreated to the test position, the interlocking angle steel and the operating shaft are disengaged, and the grounding switch can be closed. After closing the grounding switch, the rotation of the operating shaft causes the locking rod to enter the notch of the lock disk, disengaging the locking rod from the lock block, and the door can be opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 It is a structural schematic diagram of the utility model (partial cross-section).

[0023] Figure 3 This is a state diagram of the handcart of the utility model in the working position (the interlocking angle steel is clamped with the operating shaft of the grounding switch).

[0024] Figure 4 This is a state diagram of the trolley of the utility model in the working position (the interlocking angle steel is disengaged from the operating shaft of the grounding switch).

[0025] Figure 5 This is the state diagram of the utility model handcart in the working position ( Figure 3 Another perspective).

[0026] Figure 6 This is a structural diagram of the operating shaft of the grounding switch of the utility model (with the second rocker arm installed).

[0027] Figure 7 This is a structural diagram of the operating shaft and interlocking angle steel of the grounding switch of the utility model.

[0028] Figure 8 This is the main view of the interlocking angle steel of the utility model.

[0029] Figure 9 for Figure 8 side view.

[0030] Wherein: 1. Lock block; 2. Lock rod; 3. Earthing switch assembly; 4. Rocker arm No. 1; 5. Connecting rod; 6. Interlocking angle steel; 7. Earthing switch operating shaft; 8. Rocker arm No. 2; 9. Circuit breaker; 10. Housing; 11. Door panel;

[0031] 301, grounding switch blade;

[0032] 601, locking hole;

[0033] 701. Speak. DETAILED DESCRIPTION

[0034] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0035] like Figures 1-9 As shown, the grounding protection device for a flameproof high-voltage power distribution device for mining of this embodiment includes a housing 10, a circuit breaker 9 is installed in the interior of the housing 10, an openable and closable door panel 11 is installed on the front face of the housing 10, a locking rod 2 is installed on the door panel 11, and a lock block 1 that cooperates with the locking rod 2 is installed on the housing 10 beside the door panel 11;

[0036] An interlocking angle steel 6 is mounted on a single circuit breaker 9 via fasteners. The circuit breaker 9 also includes an earthing switch operating shaft 7 that matches the interlocking angle steel 6. The head of the earthing switch operating shaft 7 has an opening 701 that corresponds to the interlocking angle steel 6. The tail of the earthing switch operating shaft 7 passes through the door panel 11 and is connected to the locking rod 2.

[0037] A grounding switch assembly 3 is also fixedly installed inside the housing 10. A first rocker arm 4 is hinged on the grounding switch assembly 3. A second rocker arm 8 is sleeved on the grounding switch operating shaft 7. A connecting rod 5 is installed between the first rocker arm 4 and the second rocker arm 8.

[0038] The earthing switch operating shaft 7 is an integrated structure.

[0039] When the grounding switch operating shaft 7 is in the trolley working position, the interlocking angle steel 6 is clamped in the opening 701 and the grounding switch operating shaft 7 cannot rotate; when the grounding switch operating shaft 7 is in the trolley testing position, the interlocking angle steel 6 is disengaged from the opening 701 and the grounding switch operating shaft 7 can rotate.

[0040] The grounding switch operating shaft 7 is provided with multiple steps.

[0041] One end of the No. 2 rocker arm 8 is provided with a large hole, and the other end is provided with a small hole. The large hole matches the grounding switch operating shaft 7, and the small hole matches the connecting rod 5.

[0042] The interlocking angle steel 6 is an integrated structure.

[0043] A plurality of locking holes 601 are formed on one right angle side of the interlocking angle steel 6 , which is fixed to the circuit breaker 9 via fasteners. The other right angle side of the interlocking angle steel 6 cooperates with the grounding switch operating shaft 7 .

[0044] The grounding switch assembly 3 is provided with a grounding switch blade 301 .

[0045] Two groups of circuit breakers 9 are distributed vertically inside the housing 10 .

[0046] In actual work process:

[0047] When the circuit breaker 9 is in the test position, the interlocking angle steel 6 is disengaged from the earthing switch operating shaft 7, and the earthing switch operating shaft 7 can be engaged. The second rocker arm 8 drives the connecting rod 5 and the first rocker arm 4 to swing, closing the earthing switch assembly 3. At the same time, the earthing switch operating shaft 7 is disengaged from the interlocking angle steel 6. Due to the rotation of the earthing switch operating shaft 7, the locking rod 2 is disengaged from the locking block 1, and the door panel 11 can be opened.

[0048] When the grounding switch assembly 3 is in the open position, the opening 701 of the grounding switch operating shaft 7 is horizontal, and the interlocking angle steel 6 on the circuit breaker 9 is locked in the opening 701 of the grounding switch operating shaft 7. At this point, the grounding switch assembly 3 cannot rotate the grounding switch operating shaft 7 because the grounding switch operating shaft 7 and the interlocking angle steel 6 are already engaged. As the circuit breaker 9 moves toward the operating position, the interlocking angle steel 6 remains engaged with the grounding switch operating shaft 7 until the operating position is reached, thus achieving the interlocking function between the circuit breaker 9 and the grounding switch assembly 3, ensuring overall safety and reliability.

[0049] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the scope of protection of the utility model.

Claims

1. A grounding protection device for a mine flameproof high-voltage power distribution device, characterized by: The invention comprises a housing (10), wherein a circuit breaker (9) is installed in the housing (10), a door panel (11) which can be opened and closed is installed on the front face of the housing (10), a locking rod (2) is installed on the door panel (11), and a locking block (1) which cooperates with the locking rod (2) is installed on the housing (10) beside the door panel (11); An interlocking angle steel (6) is mounted on a single circuit breaker (9) via fasteners, and the circuit breaker also includes an earthing switch operating shaft (7) that matches the interlocking angle steel (6). The head of the earthing switch operating shaft (7) is provided with an opening (701), the opening (701) corresponds to the interlocking angle steel (6), and the tail of the earthing switch operating shaft (7) passes through the door panel (11) and is connected to the locking rod (2). A grounding switch assembly (3) is fixedly installed inside the housing (10), a first rocker arm (4) is hingedly connected to the grounding switch assembly (3), a second rocker arm (8) is sleeved on the grounding switch operating shaft (7), and a connecting rod (5) is installed between the first rocker arm (4) and the second rocker arm (8).

2. A grounding protection device for a mine flameproof high-voltage power distribution device according to claim 1, characterized in that: The grounding switch operating shaft (7) is an integrated structure.

3. A grounding protection device for a mine flameproof high-voltage power distribution device according to claim 1, characterized in that: When the grounding switch operating shaft (7) is in the trolley working position, the interlocking angle steel (6) is clamped in the opening (701), and the grounding switch operating shaft (7) cannot rotate; when the grounding switch operating shaft (7) is in the trolley testing position, the interlocking angle steel (6) is disengaged from the opening (701), and the grounding switch operating shaft (7) can rotate.

4. A grounding protection device for a mine flameproof high-voltage power distribution device according to claim 1, characterized in that: The grounding switch operating shaft (7) is provided with multiple steps.

5. A grounding protection device for a mine flameproof high-voltage power distribution device according to claim 1, characterized in that: The second rocker arm (8) has a large hole at one end and a small hole at the other end. The large hole matches the grounding switch operating shaft (7), and the small hole matches the connecting rod (5).

6. A grounding protection device for a mine flameproof high-voltage power distribution device according to claim 1, characterized in that: The interlocking angle steel (6) is an integrated structure.

7. A grounding protection device for a mine flameproof high-voltage power distribution device according to claim 1, characterized in that: A plurality of locking holes (601) are formed on a right angle side of the interlocking angle steel (6), and the locking holes (601) are fixed to the circuit breaker (9) via fasteners. The other right angle side of the interlocking angle steel (6) cooperates with the grounding switch operating shaft (7).

8. The grounding protection device for a mine flameproof high-voltage power distribution device according to claim 1, characterized in that: A grounding switch blade (301) is provided on the grounding switch assembly (3).

9. A grounding protection device for a mine flameproof high-voltage power distribution device according to claim 1, characterized in that: Two groups of circuit breakers (9) are distributed vertically inside the housing (10).

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