Explosion-proof liquid-cooled double-gun charging device for underground coal mine

Abstract

The invention belongs to the technical field of underground coal mine electrical equipment and provides an underground coal mine explosion-proof liquid-cooled double-gun charging device which solves the problems that an underground charging device is low in heat dissipation efficiency and unreasonable in electrical system layout, and consequently operation of the device is unstable in a complex environment. Comprising an explosion-proof shell, a liquid cooling heat dissipation system and an electrical control system, a charging cable access cavity, a transformer cavity, a charging module cavity and an intrinsic safety device cavity are formed in the explosion-proof shell, a first charging module, a second charging module and a controller are arranged in the charging module cavity, and the liquid cooling heat dissipation system is arranged in the explosion-proof shell and used for conducting heat dissipation on the charging modules. The electrical control system comprises a main loop module and a voltage protection loop module, the main loop module is used for controlling the charging process, and the voltage protection loop module is used for disconnecting the main loop module when the voltage is abnormal. According to the charging device, the heat dissipation efficiency and the charging efficiency can be improved under the condition that the size is not increased, the requirement for rapid charging is met, and the underground anti-explosion requirement is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment in coal mine, in particular to a coal mine underground explosion-proof liquid-cooled double-gun charging device. BACKGROUND

[0002] The charging device in coal mine works in an explosion hazard environment, and the charging device not only needs to meet the requirements of the electrical system, but also needs to meet the use requirements of electrical equipment in an explosive gas environment, and in addition, it also needs to meet the heat dissipation problem of electrical equipment in a closed space.

[0003] At present, the mine double-gun charging device in coal mine adopts a two-cavity structure, that is, a wiring cavity and a main cavity, wherein the wiring cavity is used for connecting the charging gun cable and the power supply cable, and the main cavity is used for placing the transformer, power devices, DC / DC power supply, power devices and control devices, etc.

[0004] The heat dissipation mode of the mine charging device adopts a heat dissipation mode similar to the ground dry-type transformer, that is, arranging heat dissipation rib plates outside the explosion-proof shell, and dissipating heat through the heat dissipation rib plates. The cooling mode of the rib plate conduction heat dissipation has the disadvantage that the refrigerant fluid is not introduced into the inside of the mine charging device, the heat dissipation efficiency is low, and the electrical heating devices are arranged in the electrical control box close to the explosion-proof shell part, causing the mine charging device to be large in size and low in heat dissipation efficiency. SUMMARY

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a coal mine underground explosion-proof liquid-cooled double-gun charging device.

[0006] A coal mine underground explosion-proof liquid-cooled double-gun charging device, comprising: An explosion-proof shell, the explosion-proof shell has a charging cable access cavity, a transformer cavity, a charging module cavity and an intrinsically safe device cavity inside, the charging module cavity is provided with a first charging module, a second charging module and a controller; A liquid cooling heat dissipation system, the liquid cooling heat dissipation system is arranged in the explosion-proof shell, and is used for dissipating heat for the first charging module and the second charging module; An electrical control system, the electrical control system comprises a main loop module and a voltage protection loop module, the main loop module and the voltage protection loop module are arranged in the charging module cavity, the main loop module is used for controlling the charging process, and the voltage protection loop module is used for disconnecting the main loop module when the voltage is abnormal.

[0007] Optionally, the liquid cooling heat dissipation system comprises a first liquid cooling plate and a second liquid cooling plate, the first liquid cooling plate is thermally coupled with the first charging module, and the second liquid cooling plate is thermally coupled with the second charging module.

[0008] Optionally, a first explosion-proof partition group is provided between the charging cable access cavity and the charging module cavity, a second explosion-proof partition group is provided between the charging module cavity and the intrinsically safe device cavity, and a heat insulation plate is provided between the transformer cavity and the charging module cavity, the heat insulation plate being attached to the second liquid cooling plate.

[0009] Optionally, the main circuit module includes an AC incoming circuit breaker, a transformer, an AC contactor, and a DC contactor group connected in sequence; The AC incoming circuit breaker is used to connect to an external AC power source; The transformer is used to convert the AC power supply into a charging voltage; The AC contactor is used to control the switching on and off of the AC power supply; The DC contactor group includes an output contactor and a bus tie contactor. The output contactor is used to control the charging output of the first charging module and the second charging module. The bus tie contactor is switched on and off by the controller through positioning judgment to identify the working position and automatically switch between the high current mode on the ground and the low current mode downhole.

[0010] Optionally, the voltage protection circuit module adopts a dual redundancy structure. The voltage protection circuit module includes a voltage sampling unit and a comparator. The voltage sampling unit monitors the incoming line voltage in real time. When the incoming line voltage deviates from the rated value by ±15%, the output of the AC incoming line circuit breaker is cut off by controlling the coil of the AC incoming line circuit breaker.

[0011] Optionally, the electrical control system further includes an intrinsically safe and non-intrinsically safe isolation circuit module, which is used to isolate the non-intrinsically safe circuit in the charging module cavity from the intrinsically safe circuit in the intrinsically safe device cavity.

[0012] Preferably, it also includes an interactive system, which includes an intrinsically safe display screen, an explosion-proof push-button switch, an explosion-proof selection switch, and an explosion-proof emergency stop switch; The intrinsically safe display screen is disposed in the intrinsically safe device cavity and is used to display the charging status; The explosion-proof button switch is located in the charging module cavity and is used to control the charging process; The explosion-proof selection switch is located in the charging module cavity and is used to select different charging modes or parameters. The explosion-proof emergency stop switch is located in the charging module cavity and is used to cut off the power supply in an emergency.

[0013] Optionally, the surface of the intrinsically safe display screen is covered with explosion-proof glass.

[0014] Optionally, the explosion-proof housing is provided with a flow channel, which passes through the explosion-proof housing and connects to an external cooling circulation device.

[0015] Optionally, a temperature sensor is provided in the charging module cavity, and the temperature sensor monitors the temperature of the first charging module and the second charging module in real time.

[0016] The technical solution provided in this disclosure has the following advantages compared with the prior art: This disclosure provides an explosion-proof liquid-cooled dual-gun charging device for underground coal mines. This charging device has four chambers within an explosion-proof housing: a charging cable access chamber, a transformer chamber, a charging module chamber, and an intrinsically safe device chamber. These four chambers allow for a rational layout of different functional modules, avoiding the problems of large size and low heat dissipation efficiency associated with traditional two-chamber structures where electrical heating components are concentrated near the control box. Through a rational partitioning design, each chamber can independently accommodate and protect its internal electrical components, thereby reducing the overall size of the charging device. Furthermore, the liquid cooling system within the explosion-proof housing offers higher heat dissipation efficiency compared to traditional heat dissipation fins, allowing the four chambers to improve heat dissipation efficiency without increasing size, ensuring the normal temperature of the charging module, thereby improving charging power and efficiency, and further optimizing space utilization.

[0017] This charging device is equipped with a main circuit module and a voltage protection circuit module. The main circuit module enables the two charging modules to operate independently or in parallel, meeting the needs of fast charging. The main circuit module is also equipped with a bus tie contactor. The bus tie contactor is switched on and off by the controller through positioning judgment and identification of the working position, thereby automatically switching between the high current mode on the ground and the low current mode downhole, adapting to the explosion-proof requirements downhole. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an explosion-proof liquid-cooled dual-gun charging device for underground coal mines according to an embodiment of the present invention. Figure 2 This is an electrical system diagram of an explosion-proof liquid-cooled dual-gun charging device for underground coal mines according to an embodiment of the present invention.

[0020] Among them, 1. Explosion-proof enclosure; 1.1 Charging cable access cavity; 1.2 Transformer cavity; 1.3 Charging module cavity; 1.4 Intrinsically safe device cavity; 1.5 First explosion-proof partition group; 1.6 Second explosion-proof partition group; 1.7 Heat insulation plate; 1.8 First liquid cooling plate; 1.9 Second liquid cooling plate; 1.10 First charging module; 1.11 Second charging module; 1.12 Controller; 2. Electrical control system; 2.1 Main circuit module; 2.1.1 AC incoming circuit breaker; 2.1.2 Transformer; 2.1.3 AC contactor; 2.1.4 Output contactor; 2.1.5 Bus tie contactor; 2.2 Voltage protection circuit module; 2.3 Intrinsically safe and non-safe isolation circuit module; 2.3.1 Intrinsically safe display screen. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described 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 implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should fall within the scope of the technical content disclosed in the present invention. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0023] Reference Figure 1 and Figure 2 As shown, this embodiment provides an explosion-proof liquid-cooled dual-gun charging device for underground coal mines, including an explosion-proof housing 1, a liquid cooling heat dissipation system, and an electrical control system 2.

[0024] Reference Figure 1As shown, the explosion-proof housing 1 has a charging cable access cavity 1.1, a transformer cavity 1.2, a charging module cavity 1.3, and an intrinsically safe device cavity 1.4. The charging cable access cavity 1.1 is used to connect to an external power source, the transformer cavity 1.2 is used to install a transformer 2.1.2, the charging module cavity 1.3 is used to install a charging module, and the charging module cavity 1.3 is equipped with a first charging module 1.10, a second charging module 1.11, and a controller 1.12. The intrinsically safe device cavity 1.4 is used to install intrinsically safe display and control components.

[0025] The liquid cooling system is housed within the explosion-proof enclosure 1. The liquid cooling system is used to dissipate heat from the first charging module 1.10 and the second charging module 1.11. Specifically, the liquid cooling system includes a first liquid cooling plate 1.8 and a second liquid cooling plate 1.9. The first liquid cooling plate 1.8 is thermally coupled to the first charging module 1.10, and the second liquid cooling plate 1.9 is thermally coupled to the second charging module 1.11. The first liquid cooling plate 1.8 removes heat from the first charging module 1.10 through its internal liquid circulation, and the second liquid cooling plate 1.9 removes heat from the second charging module 1.11 through its internal liquid circulation, thus achieving dual-channel heat dissipation. Furthermore, the first liquid cooling plate 1.8 and the second liquid cooling plate 1.9 can operate independently.

[0026] Furthermore, a first explosion-proof partition group 1.5 is provided between the charging cable access cavity 1.1 and the charging module cavity 1.3; a second explosion-proof partition group 1.6 is provided between the charging module cavity 1.3 and the intrinsically safe device cavity 1.4; and a heat insulation plate 1.7 is provided between the transformer cavity 1.2 and the charging module cavity 1.3. The heat insulation plate 1.7 is connected to the second liquid cooling plate 1.9. The first explosion-proof partition group 1.5, the second explosion-proof partition group 1.6, and the heat insulation plate 1.7 separate the four chambers. The first explosion-proof partition group 1.5 meets the explosion-proof requirements and is used to achieve explosion-transmission isolation between the charging cable access cavity 1.1 and the charging module cavity 1.3. The second explosion-proof partition group 1.6 meets the explosion-proof requirements and is used to achieve explosion-transmission isolation between the charging module cavity 1.3 and the intrinsically safe device cavity 1.4. The heat insulation plate 1.7 realizes heat transfer between the transformer cavity 1.2 and the charging module cavity 1.3.

[0027] The four chambers allow for a rational layout of different functional modules, avoiding the problems of large size and low heat dissipation efficiency in mining charging devices caused by the concentrated placement of electrical heating components near the explosion-proof shell in the traditional two-chamber structure. Through a reasonable partition design, each chamber can independently accommodate and protect its internal electrical components, thereby reducing the overall size of the charging device. Furthermore, by setting up the first liquid cooling plate 1.8, the second liquid cooling plate 1.9, and the heat insulation plate 1.7, liquid cooling has higher heat dissipation efficiency compared to the traditional heat dissipation fin method. This allows the four chambers to improve heat dissipation efficiency without increasing the volume, ensuring the normal temperature of the charging module, thereby improving charging power and efficiency, and further optimizing space utilization.

[0028] To further improve the heat dissipation efficiency of this charging device, a flow channel is provided on the explosion-proof housing 1. The flow channel passes through the explosion-proof housing 1 and connects to the external cooling circulation device. The flow channel is used for the flow of cooling liquid to achieve heat exchange. A spiral guide structure is provided inside the flow channel. The spiral guide structure can extend the flow distance of the cooling liquid in the flow channel and increase the contact time with the inner wall of the flow channel, thereby improving the heat exchange efficiency of the cooling liquid, reducing the temperature of the charging module, and ensuring the stable and reliable operation of the charging device.

[0029] A temperature sensor is installed in the charging module cavity 1.3. The temperature sensor monitors the temperature of the first charging module 1.10 and the second charging module 1.11 in real time. When the temperature exceeds the threshold, the temperature in the charging module is adjusted.

[0030] Reference Figure 2As shown, the electrical control system 2 includes a main circuit module 2.1 and a voltage protection circuit module 2.2. Both the main circuit module 2.1 and the voltage protection circuit module 2.2 are located in the charging module cavity 1.3. The main circuit module 2.1 is used to control the charging process, and the voltage protection circuit module 2.2 is used to disconnect the main circuit module 2.1 when the voltage is abnormal. Specifically, the main circuit module 2.1 includes an AC incoming circuit breaker 2.1.1, a transformer 2.1.2, an AC contactor 2.1.3, and a DC contactor group connected in sequence. The AC incoming circuit breaker 2.1.1 is connected to an external three-phase AC power supply. After voltage transformation by the transformer 2.1.2, the voltage is output to the AC contactor 2.1.3. The AC contactor 2.1.3 closes according to the control command, and the current enters either the first charging module 1.10 or the second charging module 1.11. Of course, the current can also enter the first charging module 1.10 and the second charging module 1.11 simultaneously, realizing independent operation of a single gun or parallel output of two guns. The DC contactor group includes two output contactors 2.1.4 and a bus tie contactor 2.1.5. The bus tie contactor 2.1.5 is controlled by the controller 1.12 via a timer. The system identifies the working position and automatically switches between surface high-current mode and downhole low-current mode. Output contactor 2.1.4 controls the final charging output; specifically, the two output contactors 2.1.4 control the DC output of the first charging module 1.10 and the second charging module 1.11, respectively. When the bus tie contactor 2.1.5 switches to surface high-current mode, it closes, and the first charging module 1.10 and the second charging module 1.11 are connected in parallel, with the output currents superimposed to meet the fast charging requirements. When the bus tie contactor 2.1.5 switches to downhole low-current mode, it opens, and either the first charging module 1.10 or the second charging module 1.11 operates independently. The output current is limited to below 250A by a current-limiting resistor, adapting to downhole explosion-proof requirements.

[0031] The voltage protection circuit module 2.2 adopts a dual-redundancy structure. The voltage protection circuit module 2.2 includes a voltage sampling unit and a comparator. The voltage sampling unit monitors the incoming line voltage in real time and compares it with the rated voltage. When the incoming line voltage deviates from the rated value by ±15%, the comparator outputs a low-level signal within 10ms, cutting off the power supply to coils B3-3 and N2-2 of the AC incoming line circuit breaker 2.1.1, thereby cutting off the output of the AC incoming line circuit breaker 2.1.1 to forcibly disconnect the main circuit module 2.1. That is, the comparator transmits a protection signal to the coil of the AC contactor 2.1.3 to forcibly disconnect the main circuit module 2.1, avoiding overvoltage damage to the first charging module 1.10 and the second charging module 1.11.

[0032] The electrical control system 2 also includes an intrinsically safe and non-intrinsically safe isolation circuit module 2.3. This module isolates the non-intrinsically safe circuits in the charging module cavity 1.3 from the intrinsically safe circuits in the intrinsically safe device cavity 1.4. It employs both opto-isolation and an isolation transformer for dual isolation. Specifically, the non-intrinsically safe communication is connected to the controller 1.12, and the intrinsically safe communication is connected to the intrinsically safe devices within the intrinsically safe device cavity 1.4. This signal isolation ensures the safe transmission of control signals, guaranteeing that the intrinsically safe devices will not be interfered with or damaged by abnormalities in the non-intrinsically safe circuits in the complex environment of an underground coal mine, thus ensuring the electrical safety and stability of the entire charging device. Power isolation uses a mining-grade intrinsically safe isolation transformer to provide a safe power supply to the intrinsically safe device cavity 1.4. This dual isolation method improves the system's anti-interference capability, reduces errors and distortions during signal transmission, and enables the intrinsically safe devices to accurately receive and execute control commands.

[0033] This charging device also includes an interactive system, which comprises an intrinsically safe display screen 2.3.1, an explosion-proof push-button switch, an explosion-proof selection switch, and an explosion-proof emergency stop switch. The intrinsically safe display screen 2.3.1 is located in the intrinsically safe device cavity 1.4 and is connected to other intrinsically safe circuits in the intrinsically safe device cavity 1.4. It is used to receive and display relevant information of the charging device, such as charging status, power level, and fault information. The surface of the intrinsically safe display screen 2.3.1 is covered with explosion-proof glass, making it suitable for high-humidity and dusty environments. The explosion-proof push-button switch is located in the charging module cavity 1.3 and is used to control the charging process, such as controlling the start and stop of the charging device. By pressing the explosion-proof push-button switch, the operator can trigger the corresponding action of the charging device. The explosion-proof selection switch is located in the charging module cavity 1.3 and is used to select different charging modes or parameters, such as charging current and charging time. The explosion-proof selection switch allows the operator to adjust the working mode of the charging device according to actual needs. The explosion-proof emergency stop switch is located in the charging module cavity 1.3 and is used to cut off the power supply in an emergency to prevent the accident from escalating and to protect the equipment.

[0034] When this dual-gun charging device is in operation, the external three-phase AC cable is connected to the charging cable access cavity 1.1. The operator first starts the charging device using the explosion-proof button switch. The AC incoming circuit breaker 2.1.1 closes, and the transformer 2.1.2 is energized, outputting 220V AC power. At this time, the intrinsically safe display screen 2.3.1 in the interactive system will light up, displaying the initial charging status interface. Then, the operator can select the appropriate charging mode or parameters according to actual needs using the explosion-proof selection switch, such as setting the required charging current and the estimated charging time. When using single-gun charging underground, the position sensor detects the underground signal, and the controller 1.12 controls the bus tie contactor 2.1.5 to open, switching the device to the underground low-current mode. When the single-gun setting is selected, the corresponding output contactor 2.1.4 closes, and the first charging module 1.10 or the second charging module 1.11 outputs current to start charging. When using dual-gun charging underground, the position sensor detects the underground signal, and the controller 1.12 controls the bus tie contactor 2.1.5 to close, switching the device to the surface high-current mode. Select the dual-gun mode. Both output contactors 2.1.4 close, connecting the first charging module 1.10 and the second charging module 1.11 in parallel. The output currents of the first charging module 1.10 and the second charging module 1.11 are then superimposed, initiating charging. During charging, temperature sensors monitor the temperatures of the first charging module 1.10 and the second charging module 1.11 in real time. The liquid cooling system automatically adjusts the flow rate based on the temperature. Simultaneously, the voltage protection circuit module 2.2 continuously monitors the input voltage. When the input voltage deviates from the rated value by ±1... At 5%, the comparator will quickly output a low-level signal within 10ms, cutting off the power supply to the AC incoming circuit breaker 2.1.1, thereby forcibly cutting off the main circuit module 2.1 to prevent the charging module from being damaged due to overvoltage. If an emergency occurs during charging, the operator can immediately press the explosion-proof emergency stop switch to quickly cut off the power supply, prevent the accident from escalating and protect the equipment. When the electric equipment is fully charged or the stop button is manually pressed, the output contactor 2.1.4 will disconnect, the main circuit will be de-energized, and the intrinsically safe display screen 2.3.1 will show that charging is complete.

[0035] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A liquid-cooled dual-gun charging device for explosion-proof operation in coal mines, characterized in that, include: An explosion-proof enclosure (1) has a charging cable access cavity (1.1), a transformer cavity (1.2), a charging module cavity (1.3) and an intrinsically safe device cavity (1.4) inside. The charging module cavity (1.3) is provided with a first charging module (1.10), a second charging module (1.11) and a controller (1.12). A liquid cooling system is provided inside the explosion-proof housing (1) and is used to dissipate heat from the first charging module (1.10) and the second charging module (1.11). An electrical control system (2) includes a main circuit module (2.1) and a voltage protection circuit module (2.2). Both the main circuit module (2.1) and the voltage protection circuit module (2.2) are located in the charging module cavity (1.3). The main circuit module (2.1) is used to control the charging process, and the voltage protection circuit module (2.2) is used to disconnect the main circuit module (2.1) when the voltage is abnormal.

2. The explosion-proof liquid-cooled dual-gun charging device for underground coal mines according to claim 1, characterized in that, The liquid cooling system includes a first liquid cooling plate (1.8) and a second liquid cooling plate (1.9). The first liquid cooling plate (1.8) is thermally coupled to the first charging module (1.10), and the second liquid cooling plate (1.9) is thermally coupled to the second charging module (1.11).

3. The explosion-proof liquid-cooled dual-gun charging device for underground coal mines according to claim 2, characterized in that, A first explosion-proof partition group (1.5) is provided between the charging cable access cavity (1.1) and the charging module cavity (1.3), a second explosion-proof partition group (1.6) is provided between the charging module cavity (1.3) and the intrinsically safe device cavity (1.4), a heat insulation plate (1.7) is provided between the transformer cavity (1.2) and the charging module cavity (1.3), and the heat insulation plate (1.7) is attached to the second liquid cooling plate (1.9).

4. The explosion-proof liquid-cooled dual-gun charging device for underground coal mines according to claim 1, characterized in that, The main circuit module (2.1) includes an AC incoming circuit breaker (2.1.1), a transformer (2.1.2), an AC contactor (2.1.3), and a DC contactor group connected in sequence; The AC incoming circuit breaker (2.1.1) is used to connect to an external AC power source; The transformer (2.1.2) is used to convert the voltage of the AC power supply; The AC contactor (2.1.3) is used to control the switching on and off of the AC power supply; The DC contactor group includes an output contactor (2.1.4) and a bus tie contactor (2.1.5). The output contactor (2.1.4) is used to control the charging output of the first charging module (1.10) and the second charging module (1.11). The bus tie contactor (2.1.5) is switched on and off by the controller (1.12) through positioning judgment to identify the working position, and automatically switches between the high current mode on the ground and the low current mode downhole.

5. The explosion-proof liquid-cooled dual-gun charging device for underground coal mines according to claim 4, characterized in that, The voltage protection circuit module (2.2) adopts a dual-redundancy structure. The voltage protection circuit module (2.2) includes a voltage sampling unit and a comparator. The voltage sampling unit monitors the incoming line voltage in real time. When the incoming line voltage deviates from the rated value by ±15%, it controls the AC incoming line circuit breaker (…). The coil of 2.1.1) cuts off the output of the AC incoming circuit breaker (2.1.1).

6. The explosion-proof liquid-cooled dual-gun charging device for underground coal mines according to claim 1, characterized in that, The electrical control system (2) further includes an intrinsically safe and non-safe isolation circuit module (2.3), which is used to isolate the non-intrinsically safe circuit in the charging module cavity (1.3) from the intrinsically safe circuit in the intrinsically safe device cavity (1.4).

7. The explosion-proof liquid-cooled dual-gun charging device for underground coal mines according to claim 1, characterized in that, It also includes an interactive system, which includes an intrinsically safe display screen (2.3.1), an explosion-proof push-button switch, an explosion-proof selection switch, and an explosion-proof emergency stop switch; The intrinsically safe display screen (2.3.1) is disposed in the intrinsically safe device cavity (1.4) and is used to display the charging status; The explosion-proof button switch is located in the charging module cavity (1.3) and is used to control the charging process; The explosion-proof selection switch is located in the charging module cavity (1.3) and is used to select different charging modes or parameters; The explosion-proof emergency stop switch is located in the charging module cavity (1.3) and is used to cut off the power supply in an emergency.

8. The explosion-proof liquid-cooled dual-gun charging device for underground coal mines according to claim 7, characterized in that, The intrinsically safe display screen (2.3.1) is covered with explosion-proof glass.

9. A liquid-cooled dual-gun charging device for explosion-proof operation in coal mines according to claim 1, characterized in that, The explosion-proof housing (1) is provided with a flow channel, which passes through the explosion-proof housing (1) and is connected to an external cooling circulation device.

10. A liquid-cooled dual-gun charging device for explosion-proof operation in coal mines according to claim 1, characterized in that, A temperature sensor is provided in the charging module cavity (1.3). The temperature sensor is electrically connected to the electrical control system (2). The temperature sensor monitors the temperature of the first charging module (1.10) and the second charging module (1.11) in real time and transmits the temperature signal to the electrical control system (2) to adjust the heat dissipation efficiency of the liquid cooling system or control the charging process.

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