Explosion-proof remote control device

Abstract

The explosion-proof remote control device comprises an explosion-proof shell, a door plate, a man-machine interaction interface, keys, a knob and an internal circuit assembly, the front side of the explosion-proof shell is provided with a door plate flange, the upper part of the right side of the explosion-proof shell is provided with an upper wiring cavity, and the lower part of the upper wiring cavity is provided with a lower wiring cavity; the explosion-proof power distribution cabinet is characterized in that terminal holes are formed in the rear wall of the intrinsic safety cavity, terminal holes are formed in the positions, corresponding to the upper wiring cavity and the lower wiring cavity, of the right side wall of the explosion-proof shell, through-wall terminals are arranged in the terminal holes, and the contact faces of the terminal holes and the through-wall terminals and the contact faces of the door plate flange and the door plate are explosion-proof faces. According to the explosion-proof remote control device, the contact surface of the door plate flange and the door plate and the contact surface of the terminal hole and the wall-through terminal are explosion-proof surfaces, so that the safety of the explosion-proof remote control device when the explosion-proof remote control device is used in an underground coal mine is ensured. And the energy of the circuit can be limited below the minimum ignition energy by the isolation gate and the metal keyboard isolation plate, so that the explosion-proof performance of the device is further ensured.

Description

Technical Field

[0001] This utility model relates to an explosion-proof remote control device, and more specifically, to an explosion-proof remote control device suitable for remote control of coal mining equipment. Background Technology

[0002] With the development of science and technology, more and more mechanical equipment is being used in underground coal mines, such as coal mining machines, explosion-proof integrated machines, scraper conveyors, and belt conveyors. With the application of these machines, coal mining productivity has been greatly improved. Some outdated coal mining techniques, such as blasting and conventional mining, are being gradually phased out. Fully mechanized mining technology has been widely adopted. However, the working environment at the coal face is still very harsh. On the one hand, the coal face environment is harsh, and on the other hand, due to the limited space underground, coal mining equipment, such as explosion-proof integrated machines, has to have its control system designed separately and remotely controlled in places with suitable operating space and a better working environment.

[0003] Coal mines contain flammable and explosive gases, requiring underground equipment to be explosion-proof. When sparks, arcs, or dangerous temperatures occur inside the equipment, the explosion-proof enclosure's gaps confine the explosion internally, preventing it from affecting the external environment and ensuring a safe working environment. Additionally, designing intrinsically safe circuits to limit the energy of potential electrical sparks or thermal effects inside the equipment to below the minimum ignition energy also serves an explosion-proof function. Summary of the Invention

[0004] In order to overcome the shortcomings of the above-mentioned technical problems, this utility model provides an explosion-proof remote control device.

[0005] This utility model discloses an explosion-proof remote control device, comprising an explosion-proof housing, a door panel, a human-machine interface, buttons and knobs, and internal circuit components disposed within the cavity of the explosion-proof housing. The front of the explosion-proof housing is a door panel flange that mates with the door panel, and an intrinsically safe cavity is disposed within the door panel. The human-machine interface is disposed within the intrinsically safe cavity. The upper right side of the explosion-proof housing is an upper wiring cavity, and the lower part of the upper wiring cavity is a lower wiring cavity. An external power cable passes through a flared opening on the rear wall of the upper wiring cavity, and multiple waterproof connectors are disposed on the rear wall of the lower wiring cavity. The buttons and knobs are disposed on the front wall of the lower wiring cavity. The device is characterized in that: a terminal hole is provided on the rear wall of the intrinsically safe cavity, and terminal holes are provided on the right side wall of the explosion-proof housing at positions corresponding to the upper and lower wiring cavities. Through-wall terminals are disposed within the terminal holes, and the contact surfaces between the terminal holes and the through-wall terminals, and between the door panel flange and the door panel, are explosion-proof surfaces.

[0006] The explosion-proof remote control device of this utility model includes an internal circuit assembly comprising a metal button isolation plate, an isolation barrier, an analog signal expansion board, and a communication expansion board. The analog signal expansion board, the communication expansion board, and the isolation barrier are fixed to a three-sided sheet metal mounting plate. The metal button isolation plate is fixed to the top wall of the explosion-proof housing via a mounting bracket. The detection port on the metal button isolation plate is connected to the button and knob. The control signal output from the through-wall terminal in the lower wiring cavity and the input detection signal are both connected to the isolation barrier. The metal button isolation plate and the isolation barrier limit the energy of the connected lines to below the minimum ignition energy.

[0007] The explosion-proof remote control device of this utility model has a signal isolation conversion module and an intrinsically safe power supply installed on the inner wall of the door panel. An intrinsically safe power supply, an optical fiber modulator, a circuit breaker, and a pulse group suppressor are fixed on the side plate of the sheet metal mounting plate. A switching power supply is fixed on the bottom plate of the sheet metal mounting plate. The power input through the wall-penetrating terminal in the upper wiring cavity supplies power to the human-machine interface, analog expansion board, communication expansion board, metal button isolation plate, and isolation fence in sequence through the circuit breaker, pulse group suppressor, switching power supply, or intrinsically safe power supply.

[0008] The explosion-proof remote control device of this utility model is provided with terminal blocks in both the upper and lower wiring cavities, and an organic glass protective plate is provided on the outside of the door panel to protect the human-machine interface.

[0009] The explosion-proof remote control device of this utility model has grounding posts fixed on the inner wall of the door panel and the inner wall of the explosion-proof housing, a terminal post fixed on the inner wall of the upper wiring cavity, and a grounding post and a grounding mark provided on the outer wall of the explosion-proof housing.

[0010] The explosion-proof remote control device of this utility model has two lifting lugs fixed on the upper surface of the explosion-proof housing, a bottom pry frame fixed on the lower part of the explosion-proof housing, and a handle block fixed on the bottom of the door panel for easy opening and closing.

[0011] The beneficial effects of this utility model are as follows: The explosion-proof remote control device of this utility model is provided with an explosion-proof housing, a door panel, a human-machine interface, buttons and knobs, a flared mouth, a waterproof connector, an upper wiring cavity and a lower wiring cavity. The door panel is provided with an intrinsically safe cavity to accommodate the human-machine interface. A terminal hole for a through-wall terminal is opened on the inner wall of the door panel. A terminal hole for a through-wall terminal is opened on the explosion-proof housing at a position corresponding to the upper and lower wiring cavities. A door panel flange that mates with the door panel is provided on the front side of the explosion-proof housing. The contact surface between the door panel flange and the door panel, and the contact surface between the terminal hole and the through-wall terminal are all explosion-proof surfaces, i.e., the explosion-proof gap of the contact surface... The roughness and width of the explosion-proof surface ensure the explosion-proof performance of the explosion-proof remote control device. When sparks, arcs, or dangerous temperatures occur in the internal circuit of the explosion-proof remote control device, the cooling and arc-extinguishing effects of the explosion-proof surface prevent the internal explosion from being transmitted to the outside, ensuring its safety when used in the flammable and explosive gas environment of underground coal mines. The explosion-proof remote control device of this utility model can be placed in a location with less coal dust and relatively sufficient operating space to remotely control the equipment on the coal face, avoiding underground workers from operating near the coal face where there is more coal dust, more noise, and lower visibility, thus improving the working environment of the workers.

[0012] Furthermore, the internal circuit components within the explosion-proof housing are equipped with a metal key isolation plate and an isolation barrier. The isolation barrier and the metal key isolation plate can limit the energy of the circuit to below the minimum ignition energy, ensuring that the circuit output by the explosion-proof remote control device of this invention is an intrinsically safe circuit, further guaranteeing its safety when used in environments containing flammable and explosive gas. Attached Figure Description

[0013] Figure 1 This is a front view of the explosion-proof remote control device of this utility model;

[0014] Figure 2 This is a rear view of the explosion-proof remote control device of this utility model;

[0015] Figure 3 This is a left view of the explosion-proof remote control device of this utility model;

[0016] Figure 4 This is a right view of the explosion-proof remote control device of this utility model;

[0017] Figure 5 This is a top view of the explosion-proof remote control device of this utility model;

[0018] Figure 6 This is a bottom view of the explosion-proof remote control device of this utility model;

[0019] Figure 7 , Figure 8 All are perspective views of the explosion-proof remote control device of this utility model;

[0020] Figure 9 This is a perspective view of the explosion-proof housing in this utility model;

[0021] Figure 10 This is a three-dimensional sectional view of the door panel of this utility model;

[0022] Figure 11 This is a partial cross-sectional view of the explosion-proof remote control device of this utility model;

[0023] Figure 12 This is a schematic diagram of the internal circuit components in this utility model.

[0024] In the diagram: 1. Explosion-proof housing; 2. Door panel; 3. Human-machine interface; 4. Explosion-proof housing cavity; 5. Upper wiring cavity; 6. Lower wiring cavity; 7. Buttons and knobs; 8. Horn mouth; 9. Waterproof connector; 10. Through-wall terminal; 11. Terminal block; 12. Sheet metal mounting plate; 13. Analog expansion board; 14. Communication expansion board; 15. Metal button isolation plate; 16. Isolation fence; 17. Mounting bracket; 18. Door panel flange; 19. Terminal hole; 20. Grounding post; 21. Lifting lug; 22. Bottom pry bar; 23. Reinforcing rib; 24. Acrylic glass protective plate; 25. Signal isolation conversion module; 26. Intrinsically safe power supply; 27. Switching power supply; 28. Pulse burst suppressor; 29. ​​Circuit breaker; 30. Fiber optic modem; 31. Handle block; 32. Intrinsically safe cavity. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1 to 6 As shown, the front view, rear view, left view, right view, top view, and bottom view of the explosion-proof remote control device of this utility model are given respectively. Figure 7 and Figure 8 All of them are given a 3D diagram. Figure 11 A partial sectional view is provided, showing that the explosion-proof remote control device consists of an explosion-proof housing 1, a door panel 2, a human-machine interface 3, buttons and knobs 7, a flared mouth 8, a waterproof connector 9, a through-wall terminal 10, and internal circuit components. Figure 9 and Figure 10 A perspective view of the explosion-proof housing 1 and a perspective sectional view of the door panel 2 of this utility model are given respectively. The explosion-proof housing 1 is composed of a wall panel and reinforcing ribs 23 fixed to the inner surface of the wall panel to form a stable explosion-proof housing 1. The door panel 2 is located on the front side of the explosion-proof housing 1. Door panel flanges 18 that mate with the door panel 2 are provided around the front opening of the explosion-proof housing 1. An intrinsically safe cavity 32 is provided in the door panel 2, and the human-machine interface 3 is located in the intrinsically safe cavity 32. The interior of the explosion-proof housing 1 is the explosion-proof housing inner cavity 4, and the internal circuit components are located in the explosion-proof housing inner cavity 4. An upper wiring cavity 5 is provided on the upper right side of the explosion-proof housing 1, and a lower wiring cavity 6 is located below the lower wiring cavity 5.

[0027] A flared opening 8 is provided on the rear wall of the upper wiring cavity 5, through which the external power input enters the upper wiring cavity. Buttons and knobs 7 are located on the front wall of the lower wiring cavity 6, including emergency stop, reset, and start / stop buttons, as well as a high / low speed conversion knob. Multiple waterproof connectors 9 are provided on the rear wall of the lower wiring cavity 6, through which the control signals output by the explosion-proof remote control device or the information acquisition signals from the outside world are input into the lower wiring cavity 6.

[0028] Terminal holes 19 are provided on the right side wall of the explosion-proof housing 1 at positions corresponding to the upper wiring cavity 5 and the lower wiring cavity 6. Through-wall terminals 10 are installed in the terminal holes 19, allowing cables in the inner cavity 4 of the explosion-proof housing to enter the upper wiring cavity 5 and the lower wiring cavity 6 via the through-wall terminals 10. Terminal holes 19 are also provided on the rear wall of the intrinsically safe cavity 32, with through-wall terminals 10 installed in them. Thus, cables for the human-machine interface 3 in the intrinsically safe cavity 32 also enter the inner cavity 4 of the explosion-proof housing via the through-wall terminals 10.

[0029] The contact surface between the door flange 18 on the explosion-proof housing 1 and the inner side of the door panel 2 is an explosion-proof surface. The contact surface between the terminal hole 19 on the door panel 2 and the terminal hole 19 on the left side wall of the explosion-proof housing 1 and the through-wall terminal 10 is also an explosion-proof surface. That is, the explosion-proof gap, the roughness and width of the explosion-proof surface can ensure the explosion-proof performance of the explosion-proof remote control device of this utility model. When sparks, arcs and dangerous temperatures occur in the circuit of the explosion-proof remote control device of this utility model, the cooling and arc-extinguishing effect of the explosion-proof surface can prevent the internal explosion from being transmitted to the outside.

[0030] like Figure 12 The diagram shows the internal circuit components of this invention. The internal circuit components consist of a sheet metal mounting plate 12, a metal button isolation plate 15, an analog expansion board 13, a communication expansion board 14, an intrinsically safe power supply 26, a switching power supply 27, a burst suppressor 28, a circuit breaker 29, and a fiber optic modem 30. The metal button isolation plate 15 is fixed to the top wall inside the explosion-proof housing 1 by a mounting bracket 17. The detection port of the metal button isolation plate 15 is connected to the button and knob 7. After the metal button isolation plate 15 is connected to the button and knob 7 through the through-wall terminal 10 in the lower wiring cavity 6, the energy triggered by pressing or rotating the button and knob 7 can be limited to below the minimum ignition energy of the external combustible gas.

[0031] The sheet metal mounting plate 12 shown is a three-panel structure consisting of a base plate and two side plates. The analog expansion board 13, communication expansion board 14, intrinsically safe power supply 26, burst suppressor 28, circuit breaker 29, and fiber optic modulator 30 are all fixed to the sheet metal mounting plate 12. The isolation barrier 16 and switching power supply 27 are both fixed to the base plate of the sheet metal mounting plate 12. A signal isolation conversion module 25 and the intrinsically safe power supply 26 are installed on the inner wall of the door panel 2. External power enters the explosion-proof housing cavity 4 through the through-wall terminal 10 in the upper wiring cavity 5, and then sequentially provides stable DC power to the metal button isolation plate 15, isolation barrier 16, analog expansion board 13, communication expansion board 14, and human-machine interface 3 via the circuit breaker 29, burst suppressor 28, switching power supply 27, or intrinsically safe power supply 26. The control signals output from the wall-penetrating terminal 10 and the waterproof connector 9 in the lower wiring cavity 6, as well as the input detection signals, are all connected to the isolation barrier 16. The isolation barrier 16 can limit the energy of the output and output cables through the waterproof connector 9 to below the minimum ignition energy of external combustible gases to meet the explosion-proof function.

[0032] The outer side of the door panel 2 is equipped with an acrylic glass protective plate 24 to protect the human-machine interface 3. The inner side of the acrylic glass protective plate 24 has a sealing groove to prevent external water vapor from damaging the human-machine interface. Grounding posts 20 are installed on the inner wall of both the door panel 2 and the explosion-proof housing 1, as well as on the inner wall of the upper wiring cavity 5, for grounding of the corresponding modules or circuits. The outer wall of the explosion-proof housing 1 is equipped with grounding posts 20 and grounding markings for grounding the entire device.

[0033] Two lifting lugs 21 are fixed to the upper surface of the explosion-proof housing 1 for hoisting the explosion-proof remote control device. A bottom pry bar 22 is fixed to the bottom of the explosion-proof housing 1 to facilitate the movement of the entire explosion-proof remote control device. A handle block 31 is provided at the bottom of the door panel 2, and the inner side of the handle block 31 is arc-shaped to facilitate opening the front door panel 2 for maintenance. Terminal blocks 11 are provided in both the upper wiring cavity 5 and the lower wiring cavity 6 to facilitate the connection of incoming and outgoing wires.

Claims

1. An explosion-proof remote control device, comprising an explosion-proof housing (1), a door panel (2), a human-machine interface (3), buttons and knobs (7), and an internal circuit assembly disposed in the inner cavity (4) of the explosion-proof housing, wherein the front side of the explosion-proof housing is a door panel flange (18) that mates with the door panel, and an intrinsically safe cavity (32) is disposed in the door panel, and the human-machine interface is disposed in the intrinsically safe cavity; the upper part of the right side of the explosion-proof housing is an upper wiring cavity (5), and the lower part of the upper wiring cavity is a lower wiring cavity (6), a flared opening (8) through which an external power line passes is disposed on the rear wall of the upper wiring cavity, and multiple waterproof connectors (9) are disposed on the rear wall of the lower wiring cavity, and buttons and knobs are disposed on the front wall of the lower wiring cavity; characterized in that: Terminal holes (19) are provided on the rear wall of the intrinsically safe cavity. Terminal holes (19) are provided on the right wall of the explosion-proof housing at positions corresponding to the upper wiring cavity and the lower wiring cavity. A through-wall terminal (10) is provided in the terminal hole. The contact surfaces of the terminal hole and the through-wall terminal, and the contact surfaces of the door flange and the door panel are all explosion-proof surfaces.

2. The explosion-proof remote control device according to claim 1, characterized in that: The internal circuit components include a metal button isolation plate (15), an isolation barrier (16), an analog expansion board (13), and a communication expansion board (14). The analog expansion board, the communication expansion board, and the isolation barrier are fixed on a three-sided sheet metal mounting plate (12). The metal button isolation plate is fixed on the top wall of the explosion-proof housing (1) via a mounting bracket (17). The detection port on the metal button isolation plate is connected to the button and the knob. The control signal output from the through-wall terminal (10) in the lower wiring cavity (6) and the input detection signal are both connected to the isolation barrier (16). The metal button isolation plate and the isolation barrier limit the energy of the lines connected to them to below the minimum ignition energy.

3. The explosion-proof remote control device according to claim 2, characterized in that: The inner wall of the door panel (2) is provided with a signal isolation conversion module (25) and an intrinsically safe power supply (26). The side plate of the sheet metal mounting plate (12) is fixed with an intrinsically safe power supply, an optical fiber modulator (30), a circuit breaker (29) and a pulse group suppressor (28). The bottom plate of the sheet metal mounting plate is fixed with a switching power supply (27). The power input through the wall terminal (10) in the upper wiring cavity (5) supplies power to the human-machine interface (3), analog expansion board (13), communication expansion board (14), metal button isolation plate (15) and isolation fence (16) in sequence through the circuit breaker, pulse group suppressor, switching power supply or intrinsically safe power supply.

4. The explosion-proof remote control device according to claim 2 or 3, characterized in that: Both the upper wiring cavity (5) and the lower wiring cavity (6) are provided with terminal blocks (11), and the outside of the door panel (2) is provided with an organic glass protective plate (24) to protect the human-machine interface (3).

5. The explosion-proof remote control device according to claim 2 or 3, characterized in that: Grounding posts (20) are fixed on the inner wall of the door panel (2) and the inner wall of the explosion-proof housing (1). A wiring post is fixed on the inner wall of the upper wiring cavity (5). A grounding post and a grounding mark are provided on the outer wall of the explosion-proof housing (1).

6. The explosion-proof remote control device according to claim 2 or 3, characterized in that: Two lifting lugs (21) are fixed on the upper surface of the explosion-proof housing (1), a bottom pry bar (22) is fixed on the lower part of the explosion-proof housing, and a handle block (31) is fixed on the bottom of the door panel (2) to facilitate opening and closing.

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