Dual power supply switching control box for mine with explosion-proof and intrinsic safety

Abstract

The application discloses a mine-used explosion-proof and intrinsic safety type double-power switching control box, which comprises a shell, the shell is designed in a split-cavity independent mode, a wiring cavity and a main control cavity are sequentially arranged in the shell from top to bottom, the main control cavity is physically isolated from the wiring cavity, the two cavities are communicated through an explosion-proof multi-core wall-penetrating wiring terminal and an explosion-proof low-voltage wiring terminal which are arranged in the wiring cavity, and a base is arranged at the lower end of the shell; a front door is connected to the front side of the main control cavity through a door hinge, an industrial display screen is assembled on the front door through an internal hexagonal bolt, and the industrial display screen can display the state, voltage, current, contactor attraction frequency and service life data of the main and standby power sources in real time; a cover plate is arranged on the upper side of the wiring cavity through an internal hexagonal bolt, a gasket is arranged on the internal hexagonal bolt, and a handle is arranged on the upper side of the cover plate. The mine-used explosion-proof and intrinsic safety type double-power switching control box has the advantages of main control and wiring isolation, convenient wiring, quick cover opening, high maintenance efficiency and improved explosion-proof safety.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof electrical control technology for mining, specifically to a dual-power switching control box for mining applications that is both explosion-proof and intrinsically safe. Background Technology

[0002] Hazardous environments such as underground coal mines place extremely high demands on the continuity and safety of power supply. Dual power switching devices are core equipment for ensuring uninterrupted power supply to critical loads. However, existing dual power switching devices for mining generally suffer from the following defects:

[0003] 1. Low structural integration, with the main control and wiring sharing the same cavity, resulting in cumbersome wiring operations, time-consuming opening of the cover, and low maintenance efficiency;

[0004] 2. Lack of real-time display; operating parameters, power status, and component lifespan cannot be monitored intuitively.

[0005] 3. Narrow voltage adaptability, mostly fixed two-phase or three-phase input, poor adaptability to wide operating conditions;

[0006] 4. The control logic is fixed, and traditional PLCs are mostly used, which are large in size, slow in response, and have simple button logic;

[0007] 5. Slow switching speed and insufficient interlock reliability can easily lead to power outages or short circuits.

[0008] Existing technologies cannot simultaneously meet the comprehensive requirements of explosion-proof intrinsic safety compliance, wide voltage compatibility, rapid switching, intelligent display, and convenient maintenance, which restricts the safety of underground power supply and operation and maintenance efficiency. Therefore, we propose a mine-use explosion-proof and intrinsically safe dual power supply switching control box to solve the above-mentioned problems. Summary of the Invention

[0009] The purpose of this invention is to provide a mine-use explosion-proof and intrinsically safe dual-power switching control box to solve the problem mentioned in the background art that the existing technologies on the market are unable to simultaneously meet the comprehensive requirements of explosion-proof intrinsic safety compliance, wide voltage compatibility, fast switching, intelligent display, and convenient maintenance, thus restricting the safety of underground power supply and operation and maintenance efficiency.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a mine explosion-proof and intrinsically safe dual power supply switching control box, including a housing, wherein the housing adopts a separate cavity design, and the housing has a wiring cavity and a main control cavity opened sequentially from top to bottom. The main control cavity and the wiring cavity are physically isolated, and the two cavities are connected through an explosion-proof multi-core through-wall terminal and an explosion-proof low-voltage terminal installed inside the wiring cavity. A base is installed at the lower end of the housing.

[0011] The front side of the main control cavity is connected to a front door via a door hinge. An industrial display screen is mounted on the front door via hexagonal bolts. It displays the status of the main and backup power supplies, voltage, current, contactor engagement count, and lifespan data in real time.

[0012] A cover plate is installed on the upper side of the wiring cavity by means of an internal hex bolt. A washer is fitted on the internal hex bolt. A handle is installed on the upper side of the cover plate. A power supply and an internal ground are installed inside the wiring cavity. Two AC 95V~726V two-phase / three-phase wide voltage power supplies are connected through the explosion-proof terminal of the wiring cavity.

[0013] The main control cavity is equipped with a control unit. The control unit implements a main power priority strategy. When the main power is normal, the main circuit supplies power. When the main power fails, the backup power is automatically switched. When the main power is restored, the backup power is automatically switched back. The switching time is ≤500ms. It has main and backup power interlocking. The control unit adopts optimized program logic and uses 3-way switch buttons to realize multi-interface and multi-logic multiplexing.

[0014] The right side of the housing is equipped with a reversing assembly and a switch label, and the left side of the housing is equipped with an external grounding device. Both the external grounding device and the internal grounding device include steel claws, copper claws, and grounding labels.

[0015] Explosion-proof cable entry assembly a and explosion-proof cable entry assembly b are installed at the upper positions on both the left and right sides of the housing.

[0016] Preferably, a heat dissipation fin is also installed on the rear side of the housing. The heat dissipation fin includes a fixed fin that is installed through the rear side of the housing. A detachable fin is attached to one end of the fixed fin that extends out of the housing. A positioning hole is provided at the upper end of the detachable fin. A rotating shaft is rotatably connected to the side of the upper end of the fixed fin. A moving column is connected inside the rotating shaft by a spring. A connecting plate is connected to one end of the moving column that extends out of the rotating shaft. A positioning column is connected to the side of the connecting plate.

[0017] Preferably, the movable column slides through the rotating shaft, and the rotating shaft has a cross-shaped structure.

[0018] Preferably, the housing has an annular sealing groove on the side that fits against the front door, and the annular sealing groove has a double-layer sealing structure inside.

[0019] Preferably, the positions of the positioning pins and the positioning holes are arranged in a one-to-one correspondence, and the positioning pins and the corresponding positioning holes engage with each other.

[0020] Preferably, the housing is made of Q235A carbon steel, and the main control cavity and the wiring cavity are independently separated, with wiring only opening the wiring cavity.

[0021] Preferably, the control unit is a high-performance microcontroller, and the program implements multiplexed logic with fewer buttons.

[0022] Preferably, the double-layer sealing structure includes a fire-retardant sealing strip and a rubber sealing gasket, which are sequentially embedded inside the annular sealing groove, and the double-layer sealing structure is tightly pressed against the front door.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] (1) This explosion-proof and intrinsically safe dual power supply switching control box for mining is isolated from the main control and wiring, making wiring convenient, opening the cover quickly, and maintenance efficient, thus improving explosion-proof safety; AC95V~726V two-phase / three-phase adaptive, adaptable to complex voltage fluctuations underground; switching ≤500ms, main and backup interlocking, preventing short circuits and power interruptions; real-time visualization of parameters and lifespan, fast fault location, and low operation and maintenance costs; single-chip microcomputer + optimized program, small size, fast response, few keys and multiple logic, easy operation; integrated intrinsically safe 485, intrinsically safe 12V, leakage current interlocking, and lifespan recording, with compact functions and suitable for mining scenarios;

[0025] (2) The mine explosion-proof and intrinsically safe dual power supply switching control box is equipped with a double-layer composite sealing structure and explosion-proof cable introduction components. It has excellent dustproof, moisture-proof and explosion-proof performance, which can effectively avoid equipment failure caused by underground dust and water vapor intrusion, greatly extend the service life of the equipment and reduce the operation and maintenance costs.

[0026] (3) The mine explosion-proof and intrinsically safe dual power supply switching control box has heat dissipation fins to prevent heat accumulation, and the structure of the heat dissipation fins located on the outside is detachable, making it easy to clean and suitable for mining scenarios. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a side view of the structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the explosion-proof multi-core through-wall terminal structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the rear view structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the rubber sealing gasket structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the fireproof and flame-retardant sealing strip structure of the present invention;

[0033] Figure 7 This is a schematic diagram of the heat sink fin structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the detachable fin structure of the present invention;

[0035] Figure 9 This is a schematic diagram of the positioning column structure of the present invention;

[0036] Figure 10 This is a schematic diagram of the rotating shaft structure of the present invention;

[0037] Figure 11 This is a schematic cross-sectional view of the rotating shaft of the present invention;

[0038] Figure 12 This is a cross-sectional view of the explosion-proof cable inlet component a of the present invention;

[0039] Figure 13 This is a cross-sectional view of the explosion-proof cable inlet assembly b of the present invention;

[0040] Figure 14 This is a cross-sectional view of the commutation component of the present invention;

[0041] Figure 15 This is a schematic diagram of the front door cross-sectional structure of the present invention;

[0042] Figure 16 This is a cross-sectional view of the explosion-proof multi-core through-wall terminal block of the present invention;

[0043] Figure 17 This is a schematic cross-sectional view of the explosion-proof low-voltage terminal block of the present invention;

[0044] Figure 18 This is a schematic diagram of the internal structure of the present invention.

[0045] In the diagram: 1. Housing; 2. Front door; 3. Cover plate; 4. Base; 5. Reversing assembly; 6. Power supply; 7. Socket head bolt; 8. Washer; 9. On / off label; 10. Display screen; 11. Main control chamber; 12. Wiring chamber; 13. Door hinge; 14. Explosion-proof cable entry assembly a; 15. Explosion-proof cable entry assembly b; 16. External grounding; 17. Internal grounding; 18. Explosion-proof multi-core through-wall terminal; 19. Explosion-proof low-voltage terminal; 20. Control unit; 21. Handle; 22. Steel claw; 23. Copper claw; 24. Grounding label; 25. Heat dissipation fins; 26. Fixed fins; 27. Removable fins; 28. Shaft; 29. ​​Moving column; 30. Spring; 31. Connecting plate; 32. Positioning column; 33. Positioning hole; 34. Annular sealing groove; 35. Fireproof and flame-retardant sealing strip; 36. Rubber sealing gasket. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] Please see Figures 1-18The present invention provides the following technical solution: a mine explosion-proof and intrinsically safe dual power supply switching control box, including a housing 1. The housing 1 adopts a separate cavity design. The housing 1 has a wiring cavity 12 and a main control cavity 11 arranged from top to bottom. The main control cavity 11 and the wiring cavity 12 are physically isolated. The two cavities are connected through an explosion-proof multi-core through-wall terminal 18 and an explosion-proof low-voltage terminal 19 installed inside the wiring cavity 12. A base 4 is installed at the lower end of the housing 1.

[0048] The front side of the main control cavity 11 is connected to the front door 2 via the door hinge 13. The front door 2 is equipped with an industrial display screen 10 via hexagonal bolts 7, which displays the status of the main and backup power supplies, voltage, current, contactor engagement times and lifespan data in real time.

[0049] A cover plate 3 is installed on the upper side of the wiring cavity 12 via an internal hex bolt 7. A washer 8 is fitted on the internal hex bolt 7. A handle 21 is installed on the upper side of the cover plate 3. A power supply 6 and an internal grounding 17 are installed inside the wiring cavity 12. Two AC95V~726V two-phase / three-phase wide voltage power supplies 6 are connected through the explosion-proof terminals of the wiring cavity 12. The wide voltage input range is AC95V~726V, which is compatible with two-phase / three-phase adaptive access and is suitable for downhole fluctuating working conditions.

[0050] The main control cavity 11 houses a control unit 20. The control unit 20 implements a main power priority strategy, with automatic / manual dual modes. In manual mode, it can force switching regardless of the power supply status. When the main power is normal, the main circuit is powered. When the main power fails, it automatically switches to the backup power. When the main power is restored, it automatically switches back. The switching time is ≤500ms. It has main and backup power interlock to ensure that only one output is available at any time. The control unit 20 adopts optimized program logic and uses three switch buttons to realize multi-interface and multi-logic multiplexing operation. The same button can perform functions such as closing / opening, page turning, and parameter setting on different interfaces.

[0051] The right side of the housing 1 is equipped with a reversing assembly 5 and a switch label 9, and the left side of the housing 1 is equipped with an external grounding 16. Both the external grounding 16 and the internal grounding 17 include steel claws 22, copper claws 23 and grounding labels 24.

[0052] Explosion-proof cable entry assembly a14 and explosion-proof cable entry assembly b15 are installed at the upper positions on both the left and right sides of the housing 1.

[0053] Furthermore, the housing 1 is made of Q235A carbon steel, the main control chamber 11 and the wiring chamber 12 are independently separated, and wiring only requires opening the wiring chamber 12, which reduces the number of bolts to be removed and installed, making it convenient to open the cover and efficient to maintain.

[0054] Furthermore, the control unit 20 is a high-performance microcontroller, which is small in size, fast in response, and allows for fewer buttons and more logic multiplexing in the program implementation;

[0055] Specifically, this mine-use explosion-proof and intrinsically safe dual-power switching control box features integrated functions including intrinsically safe RS485 communication, intrinsically safe DC12V output, leakage current interlock, power interlock, and lifespan recording. Its electrical configuration includes: rated input AC127V~660V, rated current 30A, input apparent power ≤35.0kVA; one channel of intrinsically safe RS485 half-duplex communication with a rate of 9600bps and a maximum transmission distance of 2km; one channel of intrinsically safe DC12V output with a rated current ≤1.0A and overcurrent protection ≤1.8A.

[0056] The circuit board uses high-voltage relays, with hardware and software interlocking between the main circuit relays and the backup circuit relays to ensure that only one circuit is engaged at any given time. The circuit board transformer uses a tightly wound coil with a coil fullness of 96%, ensuring that the secondary side always outputs a regulated DC 24V when the input range is 95V to 726V. The high-voltage relay uses silver alloy contacts, which are not easily oxidized and have excellent conductivity and arc corrosion resistance. The high-temperature flame-retardant copper coil has fine wires, can withstand high voltage, has high purity and quality, stable performance, and a long service life. The ceramic welding seal eliminates the risk of arc leakage.

[0057] The main power supply and the backup power supply are connected to the main and backup power supply circuits in the box through the explosion-proof terminals inside the wiring cavity 12. The wiring cavity 12 is isolated from the main control cavity 11. The power lines are introduced into the control circuit inside the main control cavity 11 through the isolated terminals. The equipment can automatically identify the two-phase and three-phase wiring methods and stably draw power in the ultra-wide voltage range of AC95V~726V.

[0058] The microcontroller control unit 20 continuously collects the voltage signals of the main circuit and the backup circuit in real time, and determines the energization status of the two power supplies in real time. The equipment follows the principle of prioritizing the main circuit power supply by default. When the main power supply is energized, the main control circuit drives the main contactor to engage and the backup contactor to disengage, and the load is continuously powered by the main power supply. When the microcontroller detects that the main power supply is de-energized and the backup power supply is energized, the control system quickly disconnects the main circuit and closes the backup circuit, with a total switching time of ≤500ms. When the main power supply returns to normal voltage, the control system automatically switches back to the main power supply and the backup circuit trips and stops. The main and backup contactors are equipped with a hardware electrical interlock structure, which allows only one circuit to conduct at a time, preventing the two power supplies from being short-circuited in parallel.

[0059] The manual mode is not constrained by the energization of the two power supplies. The switching command is issued through the button 11 of the main control cavity. After receiving the command, the microcontroller forcibly disconnects the current operating circuit and closes the other power supply circuit, realizing free switching by human under the condition of no power supply.

[0060] The microcontroller has a built-in optimized control program, and the hardware is only configured with 3 switch buttons. Based on the interface partitioning logic, the buttons realize the closing and opening control in the parameter closing interface; when switching to the parameter browsing interface, the buttons in the same group are reused as page up and down and parameter modification buttons, and the software logic realizes the control of multiple groups of actions with a small number of hardware points.

[0061] The voltage and current sampling circuit collects input and output electrical parameters in real time. The signal of each contactor engagement is synchronously sent to the microcontroller. The microcontroller records the number of contactor engagements and the running time of components and calculates the remaining service life. All operating data is transmitted to the industrial display screen for visualization in real time.

[0062] The box integrates an intrinsically safe isolated power supply module. One channel outputs an intrinsically safe DC 12V power supply after isolation and voltage regulation, with a rated output of 1A. If the output current exceeds 1.8A, the overcurrent protection will automatically activate and the power will be cut off. The other channel generates an RS485 half-duplex communication signal through an intrinsically safe isolation circuit, which remotely uploads the equipment power supply status and fault data to the host computer at a rate of 9600bps. Using MHYVP flame-retardant twisted pair cable, the maximum communication distance can reach 2km.

[0063] A leakage current detection unit is added to the output circuit to continuously monitor the insulation performance of the load-side line. When the insulation resistance of the output line to ground is lower than the safety threshold, the control system immediately locks the output circuit and cuts off the power supply output to achieve leakage current lockout protection.

[0064] Furthermore, a heat dissipation fin 25 is also installed on the rear side of the housing 1. The heat dissipation fin 25 includes a fixed fin 26 that is installed through the rear side of the housing 1. A detachable fin 27 is attached to one end of the fixed fin 26 that extends out of the housing 1. A positioning hole 33 is provided at the upper end of the detachable fin 27. A rotating shaft 28 is rotatably connected to the side of the upper end of the fixed fin 26. A moving column 29 is connected inside the rotating shaft 28 through a spring 30. A connecting plate 31 is connected to one end of the moving column 29 that extends out of the rotating shaft 28. A positioning column 32 is connected to the side of the connecting plate 31.

[0065] Furthermore, the movable column 29 slides through the rotating shaft 28, which has a cross-shaped structure;

[0066] Furthermore, the positions of the positioning pins 32 and the positioning holes 33 are set in a one-to-one correspondence, and the positioning pins 32 and the corresponding positioning holes 33 engage with each other.

[0067] Specifically, the enclosure uses heat dissipation fins 25 for heat dissipation. When dust accumulates on the heat dissipation fins 25 and needs to be cleaned, the connecting plate 31 can be pulled away from the rotating shaft 28. The connecting plate 31 drives the positioning post 32 to move out of the positioning hole 33. At the same time, the connecting plate 31 drives the end-mounted movable post 29 to slide inside the rotating shaft 28, compressing and storing force on the spring 30. Then, the rotating shaft 28 is driven to rotate, rotating the connecting plate 31 to a position that is offset from the detachable fin 27. The detachable fin 27 can then be slid upwards and removed for cleaning. After cleaning, the detachable fin 27 is slid into the end of the fixed fin 26. The lower end of the detachable fin 27 is limited by the lower opening of the fixed fin 26. The upper end can be rotated by the connecting plate 31 through the pivot 28 to correspond to the detachable fin 27. The pull on the connecting plate 31 is released, and the spring 30 controls the moving column 29 to reset and move, thereby controlling the connecting plate 31 to drive the positioning column 32 to reset and move, so that the positioning column 32 is inserted into the positioning hole 33 to lock the detachable fin 27, and the heat dissipation fin 25 continues to dissipate heat.

[0068] Furthermore, an annular sealing groove 34 is provided on one side of the housing 1 that fits into the front door 2, and a double-layer sealing structure is provided inside the annular sealing groove 34.

[0069] Furthermore, the double-layer sealing structure includes a fire-retardant sealing strip 35 and a rubber sealing gasket 36. The fire-retardant sealing strip 35 and the rubber sealing gasket 36 are sequentially embedded inside the annular sealing groove 34, and the double-layer sealing structure is tightly pressed against the front door 2.

[0070] Specifically, when the front door 2 is closed, the fire-retardant sealing strip 35 and rubber sealing gasket 36 pressed between the front door 2 and the housing 1 achieve all-round sealing, effectively preventing dust, water vapor and flammable and explosive gases from entering the box, which is in line with the explosion-proof working conditions in the mine. The contents not described in detail in this manual are existing technologies known to those skilled in the art.

[0071] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0072] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0073] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mine-use explosion-proof and intrinsically safe dual-power switching control box, comprising a housing (1), characterized in that: The housing (1) adopts a separate cavity design. The wiring cavity (12) and the main control cavity (11) are opened from top to bottom inside the housing (12). The main control cavity (11) and the wiring cavity (12) are physically isolated. The two cavities are connected through the explosion-proof multi-core through-wall terminal (18) and explosion-proof low-voltage terminal (19) installed inside the wiring cavity (12). The lower end of the housing (1) is equipped with a base (4). The front side of the main control cavity (11) is connected to the front door (2) via a door hinge (13). An industrial display screen (10) is mounted on the front door (2) via hexagonal bolts (7), which displays the status of the main and backup power supplies, voltage, current, contactor engagement times and lifespan data in real time. The upper side of the wiring cavity (12) is fitted with a cover plate (3) by an internal hex bolt (7). A washer (8) is fitted on the internal hex bolt (7). A handle (21) is installed on the upper side of the cover plate (3). The wiring cavity (12) is equipped with a power supply (6) and an internal grounding (17). Two AC95V~726V two-phase / three-phase wide voltage power supplies (6) are connected through the explosion-proof terminal of the wiring cavity (12). The main control cavity (11) is equipped with a control unit (20). The control unit (20) executes the main power priority strategy. When the main power is normal, the main power supply is supplied. When the main power fails, the backup power is automatically switched. When the main power is restored, the backup power is automatically switched back. The switching time is ≤500ms. It has main and backup power interlock. The control unit (20) adopts optimized program logic and uses 3-way switch buttons to realize multi-interface and multi-logic multiplexing. The right side of the housing (1) is equipped with a reversing assembly (5) and a switch label (9), and the left side of the housing (1) is equipped with an external grounding (16). Both the external grounding (16) and the internal grounding (17) include steel claws (22), copper claws (23) and grounding labels (24). Explosion-proof cable entry assembly a (14) and explosion-proof cable entry assembly b (15) are installed at the upper positions on both the left and right sides of the housing (1).

2. The mine-use explosion-proof and intrinsically safe dual-power switching control box according to claim 1, characterized in that: The rear side of the housing (1) is also equipped with heat dissipation fins (25). The heat dissipation fins (25) include fixed fins (26) that are installed through the rear side of the housing (1). One end of the fixed fin (26) that extends out of the housing (1) is attached to a detachable fin (27). The upper end of the detachable fin (27) is provided with a positioning hole (33). The side of the upper end of the fixed fin (26) is rotatably connected to a rotating shaft (28). The inside of the rotating shaft (28) is connected to a moving column (29) through a spring (30). One end of the moving column (29) that extends out of the rotating shaft (28) is connected to a connecting plate (31). The side of the connecting plate (31) is connected to a positioning column (32).

3. The mine-use explosion-proof and intrinsically safe dual-power switching control box according to claim 2, characterized in that: The movable column (29) slides through the rotating shaft (28), which has a cross-shaped structure.

4. The mine-use explosion-proof and intrinsically safe dual-power switching control box according to claim 1, characterized in that: The housing (1) has an annular sealing groove (34) on one side that fits the front door (2), and the annular sealing groove (34) has a double-layer sealing structure inside.

5. The mine-use explosion-proof and intrinsically safe dual-power switching control box according to claim 2, characterized in that: The positions of the positioning pins (32) and the positioning holes (33) are set in a one-to-one correspondence, and the positioning pins (32) and the corresponding positioning holes (33) engage with each other.

6. The mine-use explosion-proof and intrinsically safe dual-power switching control box according to claim 1, characterized in that: The housing (1) is made of Q235A carbon steel. The main control cavity (11) and the wiring cavity (12) are independently separated. Wiring is only done by opening the wiring cavity (12).

7. The mine-use explosion-proof and intrinsically safe dual-power switching control box according to claim 1, characterized in that: The control unit (20) is a high-performance microcontroller, and the program implements multiple logic multiplexing with fewer buttons.

8. The mine-use explosion-proof and intrinsically safe dual-power switching control box according to claim 4, characterized in that: The double-layer sealing structure includes a fire-retardant sealing strip (35) and a rubber sealing gasket (36). The fire-retardant sealing strip (35) and the rubber sealing gasket (36) are sequentially embedded in the annular sealing groove (34), and the double-layer sealing structure is tightly pressed against the front door (2).

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