A water replenishing method for an automatic water replenishing device for an explosion-proof vehicle exhaust treatment box

Abstract

The present invention belongs to the technical field of water replenishment for exhaust gas treatment boxes of explosion-proof vehicles, and provides a water replenishment method for an automatic water replenishment device for exhaust gas treatment boxes of explosion-proof vehicles, which solves the problem that the existing water replenishment tank of explosion-proof vehicles cannot dynamically control the water replenishment process and cannot accurately control the amount of water replenishment when replenishing water to the exhaust gas treatment box. It includes a water replenishment tank, a controller, and a water level and water temperature sensor arranged in the exhaust gas treatment box. The water outlet of the water replenishment tank and the water inlet of the exhaust gas treatment box are connected by a pipeline and a control element is arranged. The signal input end of the controller is connected to the water level and water temperature sensor and the throttle signal output end of the explosion-proof vehicle, and the signal output end of the controller is connected to the control element. The present invention can automatically control the water replenishment flow rate of the exhaust gas treatment box as the engine throttle angle changes. At the same time, the exhaust gas treatment box is equipped with a water level and water temperature sensor, which can timely feed back relevant parameters to the controller to achieve the purpose of accurately controlling the amount of water replenishment.

Description

Technical Field

[0001] The invention belongs to the technical field of water replenishment for an explosion-proof vehicle exhaust treatment box, and in particular relates to a water replenishment method for an automatic water replenishment device for an explosion-proof vehicle exhaust treatment box. Background Art

[0002] Material transportation is an indispensable link in coal mine production. From large hydraulic supports, fully mechanized mining machines, and scraper conveyors in fully mechanized mining working faces to small anchors, resin medicine rolls, and water pipe flanges, explosion-proof vehicles are required for transportation. Explosion-proof vehicles have explosion-proof designs for engines and electrical components to meet coal mine safety standards. Among them, the explosion-proof design of the engine is particularly important for the explosion-proof design of exhaust gas. Ordinary engines have high exhaust temperatures and may also emit open flames, which do not meet the use requirements of coal mines. When the engine is designed to be explosion-proof, the exhaust gas is treated with a water bath, which can not only reduce the exhaust temperature but also extinguish the open flame, and control the exhaust temperature within the range required by coal mine safety standards.

[0003] When explosion-proof vehicles are in use, there is only one exhaust gas treatment box that is filled with water to treat the exhaust gas, which cannot meet the requirements of long-term and long-distance transportation of vehicles. When designing the vehicle, a larger water supply tank is added, and water is supplied to the exhaust gas treatment box by increasing the air pressure of the water supply tank. A float is installed in the exhaust gas treatment box, and the buoyancy of the float is controlled by water to open or close the water supply valve; pressurized water supply, but the gas entering the water supply tank can only be controlled by constant pressure, not follow-up control, and the water supply tank and the exhaust gas treatment box are connected by a ball valve. These control methods cannot accurately control the amount of water supply, resulting in a waste of cooling water, especially during long-distance transportation. There are generally only a few fixed water supply points in coal mines. Since cooling water cannot be added in a timely and accurate manner, the vehicle exhaust gas treatment box will be transported in the absence of water, which poses a safety hazard. Summary of the invention

[0004] In order to solve the problem that the existing explosion-proof vehicle water replenishment tank cannot dynamically control the water replenishment process and cannot accurately control the water replenishment amount when replenishing water to the exhaust gas treatment tank, the present invention provides a water replenishment method for an automatic water replenishment device for an explosion-proof vehicle exhaust gas treatment tank.

[0005] The present invention is implemented by the following technical scheme: a water replenishing method for an automatic water replenishing device for an explosion-proof vehicle exhaust treatment box, the water replenishing device comprising a water replenishing tank, a controller and a water level and water temperature sensor arranged in the exhaust treatment box, the water outlet of the water replenishing tank and the water inlet of the exhaust treatment box are connected by a pipeline and a control element is arranged, the signal input end of the controller is connected with the water level and water temperature sensor and the throttle signal output end of the explosion-proof vehicle, and the signal output end of the controller is connected with the control element; the control element is an explosion-proof electromagnetic proportional control valve, and the control end of the explosion-proof electromagnetic proportional control valve is connected with the signal output end of the controller; a pressurizing port is arranged on the top of the water replenishing tank, the pressurizing port is pressurized by an air source, the air source is connected to the P port of the pre-pressure reducing valve, the A port of the pre-pressure reducing valve is connected to the air pressure gauge, the P port of the overflow valve and the P port of the explosion-proof proportional pressure reducing valve, the A port of the explosion-proof proportional pressure reducing valve is connected to the pressurizing port of the water replenishing tank through a one-way valve, the water outlet of the water replenishing tank is connected to the P port of the explosion-proof electromagnetic proportional control valve, and the A port of the explosion-proof electromagnetic proportional control valve is connected to the water inlet of the exhaust treatment box;

[0006] The water replenishment method includes the following steps:

[0007] S1: After the explosion-proof vehicle is started, the water level and temperature sensor collects the water level signal and temperature signal in the exhaust treatment box in real time, and the angle sensor collects the throttle angle signal in real time and transmits it to the controller;

[0008] S2: If the detected water level of the exhaust treatment tank is less than 20% of the upper limit of the water level, the controller adjusts the opening of the explosion-proof electromagnetic proportional control valve to the maximum; if the detected water level of the exhaust treatment tank is greater than or equal to 20% of the upper limit of the water level and less than 40% of the upper limit of the water level, the controller adjusts the opening of the explosion-proof electromagnetic proportional control valve to the middle position; if the detected water level of the exhaust treatment tank is greater than or equal to 40% of the upper limit of the water level and less than 80% of the upper limit of the water level, the controller controls the opening of the explosion-proof electromagnetic proportional control valve and the explosion-proof proportional pressure reducing valve according to the throttle angle signal and the temperature signal in the exhaust treatment tank. At this time, the throttle angle is linearly related to the opening of the explosion-proof electromagnetic proportional control valve. According to the throttle angle signal, the engine can be divided into idle, partial load, and full throttle states. In the idle state, the opening of the explosion-proof electromagnetic proportional control valve is the smallest, and in the full throttle state, the opening of the explosion-proof electromagnetic proportional control valve is the largest; if the detected water level of the exhaust treatment tank is greater than or equal to 80% of the upper limit of the water level, the controller adjusts the opening of the explosion-proof electromagnetic proportional control valve to the minimum;

[0009] S3: Repeat step S2 until the explosion-proof vehicle stops.

[0010] Preferably, the explosion-proof vehicle adopts an explosion-proof electronic fuel injection engine, and an angle sensor is installed on the throttle.

[0011] Preferably, the controller has an alarm signal output terminal, and the alarm signal output terminal is connected to the main controller of the explosion-proof vehicle.

[0012] Preferably, if it is detected that the water temperature of the exhaust gas treatment box is not higher than the preset temperature, the explosion-proof electromagnetic proportional control valve and the explosion-proof proportional pressure reducing valve maintain the original state adjusted according to the throttle angle signal;

[0013] If the detected water temperature of the exhaust treatment box is higher than the preset temperature and the opening degree of the explosion-proof electromagnetic proportional control valve is less than the maximum value, the controller controls the explosion-proof electromagnetic proportional control valve to increase the opening degree;

[0014] If the detected water temperature of the exhaust treatment tank is higher than the preset temperature and the opening degree of the explosion-proof electromagnetic proportional control valve is at the maximum, after a first preset time, if the temperature is still exceeding the standard, the controller controls the explosion-proof proportional pressure reducing valve to increase the air pressure entering the water supply tank; if the controller controls the explosion-proof proportional pressure reducing valve to make the air pressure entering the water supply tank reach the maximum value and after a second preset time, the detected water temperature of the exhaust treatment tank is still higher than the preset temperature value, the controller sends an alarm signal to the main controller of the explosion-proof vehicle, and at the same time, the main controller of the explosion-proof vehicle controls the throttle output to the minimum value, so that the engine is in idle state, and the explosion-proof vehicle stops.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention can automatically control the water replenishment flow of the exhaust gas treatment box as the engine throttle angle changes. At the same time, the exhaust gas treatment box is equipped with water level and water temperature sensors, which can timely feed back relevant parameters to the controller to achieve the purpose of accurately controlling the water replenishment amount; it can not only meet the water demand of the exhaust gas treatment box, but also save the water in the water replenishment tank, thereby extending the operating time of explosion-proof vehicles in coal mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a working principle diagram of the present invention;

[0019] Figure 2 It is the control principle diagram of the present invention.

[0020] In the figure: 1-water supply tank; 2-controller; 3-water level and water temperature sensor; 4-explosion-proof electromagnetic proportional control valve; 5-pre-pressure reducing valve; 6-pressure gauge; 7-overflow valve; 8-explosion-proof proportional pressure reducing valve; 9-check valve; 10-gas source; 11-exhaust treatment box; 12-angle sensor. DETAILED DESCRIPTION

[0021] In conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, so they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by 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 other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0023] The present invention provides an embodiment:

[0024] like Figure 1 As shown, an automatic water replenishing device for an explosion-proof vehicle exhaust treatment box includes a water replenishing tank 1, a controller 2 and a water level and water temperature sensor 3 arranged in the exhaust treatment box, the water outlet of the water replenishing tank 1 and the water inlet of the exhaust treatment box are connected by a pipeline and an explosion-proof electromagnetic proportional control valve 4 is arranged, the signal input end of the controller is connected to the water level and water temperature sensor 3 and the throttle signal output end of the explosion-proof vehicle, the signal output end of the controller is connected to the control end of the explosion-proof electromagnetic proportional control valve 4, the controller 2 has an alarm signal output end, and the alarm signal output end is connected to the main controller of the explosion-proof vehicle.

[0025] The explosion-proof vehicle uses an explosion-proof electronic fuel injection engine, and an angle sensor 12 is installed on the throttle. The present invention utilizes the control characteristics of the explosion-proof electronic fuel injection engine commonly used in coal mines, that is, the throttle is controlled by an electrical signal, and the amount of fuel injection when the explosion-proof engine is working is determined by the size of the electronically controlled throttle voltage. However, the throttle pedal is still mechanical, and an angle sensor 12 is added to the pedal, that is, after the throttle is stepped on, the angle changes, and the working state of the engine (idle, full throttle or partial load state) is measured according to the change in the angle.

[0026] A pressurizing port is arranged on the top of the water replenishment tank 1, and the pressurizing port is pressurized by an air source, and the air source is connected to the P port of the pre-pressure reducing valve 5, and the A port of the pre-pressure reducing valve 5 is connected to the pressure gauge 6, the P port of the overflow valve 7 and the P port of the explosion-proof proportional pressure reducing valve 8, and the A port of the explosion-proof proportional pressure reducing valve 8 is connected to the pressurizing port of the water replenishment tank 1 through a one-way valve 9, and the water outlet of the water replenishment tank 1 is connected to the P port of the explosion-proof electromagnetic proportional control valve 4, and the A port of the explosion-proof electromagnetic proportional control valve 4 is connected to the water inlet of the exhaust gas treatment box 11, and the signal output end of the controller is connected to the control end of the explosion-proof proportional pressure reducing valve 8.

[0027] The device uses the gas source 10 carried by the explosion-proof vehicle itself, after the pre-pressure reducing valve 5, it enters the explosion-proof proportional pressure reducing valve 8, and after the secondary pressure reducing, the water supply tank 1 is pressurized. The explosion-proof electromagnetic proportional control valve 4 transmits the angle signal of the throttle to the controller 2. The controller 2 outputs the signal after calculation, automatically adjusts the opening degree of the explosion-proof electromagnetic proportional control valve 4, and controls the amount of water flowing from the water supply tank 1 to the exhaust gas treatment tank 11. A water level and water temperature sensor 3 is added in the exhaust gas treatment tank 11 to detect the water temperature and water level parameters of the exhaust gas treatment tank 11. If the water level does not meet the use requirements, the controller will give priority to controlling the opening of the explosion-proof electromagnetic proportional control valve 4 to increase the amount of water supply. If the water level meets the use requirements, when the water temperature of the exhaust gas treatment tank 11 is higher than the preset temperature, the controller 2 will automatically increase the set pressure of the explosion-proof proportional pressure reducing valve 8, increase the gas pressure to the water supply tank 1, and increase the amount of water flowing into the exhaust gas treatment tank 11 to reduce the temperature in the exhaust gas treatment tank 11.

[0028] The present invention takes into account that the water supply tank 1 is an ordinary stainless steel part and cannot withstand high-pressure gas. In order to give full play to the proportional characteristics of the explosion-proof proportional pressure-reducing valve 8, a pre-pressure reducing valve 5 is added. After the gas source pressure is reduced, the pressure reduction range of the explosion-proof proportional pressure-reducing valve 8 is reduced, and the gas pressure of the water supply tank 1 is controlled more accurately and safely. At the same time, the double pressure reduction is also a protection for the structural parts of the water supply tank 1.

[0029] The intelligent water supply device connects the gas source carried by the explosion-proof vehicle to the P port of the pre-pressure reducing valve 5. The gas after pressure reduction reaches the A port of the pre-pressure reducing valve 5, where a barometer 6 is connected to observe the pressure value after the pre-pressure reducing valve 5 is reduced. It is also connected to the P port of the overflow valve 7 to prevent the air pressure in the water supply tank 1 from being too high due to a fault. The A port of the pre-pressure reducing valve 5 is connected to the P port of the explosion-proof proportional pressure reducing valve 8. The gas after precise pressure reduction by the explosion-proof proportional pressure reducing valve 8 reaches the 1 port of the check valve 9 connected to its A port, and is connected to the water supply tank 1 through the 2 port of the check valve 9. The check valve 9 prevents the water in the water supply tank from flowing back to the explosion-proof proportional pressure reducing valve 8, causing it to rust and other damage. The water supply tank and the exhaust gas treatment tank are connected by the explosion-proof electromagnetic proportional control valve 4, and the water in the water supply tank 1 flows into the exhaust gas treatment tank 11 through the explosion-proof electromagnetic proportional control valve 4.

[0030] like Figure 2As shown, the present invention also provides an automatic water replenishment method for an explosion-proof vehicle exhaust treatment box, comprising the following steps:

[0031] S1: After the explosion-proof vehicle is started, the water level and temperature sensor 3 collects the water level signal and temperature signal in the exhaust treatment box in real time, and the angle sensor collects the throttle angle signal in real time and transmits it to the controller 2;

[0032] S2: Controller 2 processes the water level signal first, and the water level signal has a higher priority than the temperature signal and the throttle angle signal;

[0033] If the detected water level in the exhaust treatment tank is less than 20% of the upper limit of the water level, the water in the exhaust treatment tank is too little to cool the engine exhaust. Even if the engine is in an idling state, the controller 2 adjusts the opening of the explosion-proof electromagnetic proportional control valve 4 to the maximum, so that the water in the water supply tank quickly flows to the exhaust treatment tank; if the detected water level in the exhaust treatment tank is greater than or equal to 20% of the upper limit of the water level and less than 40% of the upper limit of the water level, the controller 2 adjusts the opening of the explosion-proof electromagnetic proportional control valve 4 to the middle position to maintain stable water inflow; if the detected exhaust treatment tank When the water level is greater than or equal to 40% of the water level upper limit and less than 80% of the water level upper limit, the controller no longer uses the water level signal as the priority control signal, and the controller 2 controls the opening of the explosion-proof electromagnetic proportional control valve 4 and the explosion-proof proportional pressure reducing valve 8 according to the throttle angle signal and the temperature signal in the exhaust gas treatment box; if the detected water level of the exhaust gas treatment box is greater than or equal to 80% of the water level upper limit, it means that the water in the exhaust gas treatment box is sufficient to cool the engine exhaust gas, and the controller 2 adjusts the opening of the explosion-proof electromagnetic proportional control valve 4 to the minimum to prevent the exhaust gas box from overflowing due to excessive water replenishment;

[0034] S3: Repeat step S2 until the explosion-proof vehicle stops.

[0035] In step S2, when the detected water level of the exhaust treatment tank is greater than or equal to 40% of the upper limit of the water level and less than 80% of the upper limit of the water level, the throttle angle is linearly related to the opening of the explosion-proof electromagnetic proportional control valve 4. According to the throttle angle signal, the engine can be divided into idle, partial load, and full throttle states. The controller 2 linearly controls the valve core opening of the explosion-proof electromagnetic proportional control valve 4 according to the signal input by the throttle angle to achieve the purpose of regulating the amount of water in the exhaust treatment tank. When the engine is idling, the amount of exhaust gas discharged is small and the temperature is low. At this time, the controller 2 adjusts the valve core opening of the explosion-proof electromagnetic proportional control valve 4 to the minimum; when the engine is working at full throttle, the amount of exhaust gas discharged is large and the temperature is high. At this time, the controller 2 adjusts the valve core opening of the explosion-proof electromagnetic proportional control valve 4 to the maximum, increasing the water intake of the exhaust treatment tank and reducing the temperature in the exhaust treatment tank.

[0036] Further, if it is detected that the water temperature of the exhaust gas treatment box is not higher than the preset temperature, the explosion-proof electromagnetic proportional control valve 4 and the explosion-proof proportional pressure reducing valve 8 maintain the original state adjusted according to the throttle angle signal;

[0037] If the detected water temperature of the exhaust treatment box is higher than the preset temperature and the opening degree of the explosion-proof electromagnetic proportional control valve 4 is less than the maximum value, the controller 2 controls the explosion-proof electromagnetic proportional control valve 4 to increase the opening degree;

[0038] If the detected water temperature of the exhaust treatment tank is higher than the preset temperature and the opening of the explosion-proof electromagnetic proportional control valve 4 is at its maximum, after the first preset time, if the temperature still exceeds the standard, the controller 2 controls the explosion-proof proportional pressure reducing valve 8 to increase the air pressure entering the water supply tank 1, increase the gas pressure in the water supply tank, increase the amount of water flowing into the exhaust treatment tank, and increase the water level in the exhaust treatment tank to reduce the temperature; if the controller 2 controls the explosion-proof proportional pressure reducing valve 8 to make the air pressure entering the water supply tank 1 reach the maximum value and after the second preset time, the detected water temperature of the exhaust treatment tank is still higher than the preset temperature value, the controller 2 sends an alarm signal to the main controller of the explosion-proof vehicle, and at the same time, the main controller of the explosion-proof vehicle controls the throttle output to the minimum value, so that the engine is in an idling state, ensuring that the exhaust emission temperature of the engine does not exceed the safe value, and the explosion-proof vehicle stops. Maintenance personnel should add water to the water supply tank according to the fault prompt of the display, or inspect and replace the sensor and control valve to ensure the normal use of the automatic water supply device of the exhaust treatment tank.

[0039] In the present invention, the first preset time is 2-3 minutes, and the second preset time is 3-5 minutes.

[0040] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A water replenishing method for an automatic water replenishing device for an explosion-proof vehicle exhaust treatment box, characterized in that: The water replenishment device comprises a water replenishment tank (1), a controller (2) and a water level and water temperature sensor (3) arranged in the exhaust gas treatment tank; the water outlet of the water replenishment tank (1) and the water inlet of the exhaust gas treatment tank are connected via a pipeline and a control element is arranged; the signal input end of the controller is connected to the water level and water temperature sensor (3) and the throttle signal output end of the explosion-proof vehicle; the signal output end of the controller is connected to the control element; the control element is an explosion-proof electromagnetic proportional control valve (4); the control end of the explosion-proof electromagnetic proportional control valve (4) is connected to the signal output end of the controller (2) end; a pressurizing port is arranged at the top of the water supply tank (1), the pressurizing port is pressurized by an air source, the air source is connected to the P port of the pre-pressure reducing valve (5), the A port of the pre-pressure reducing valve (5) is connected to the pressure gauge (6), the P port of the overflow valve (7) and the P port of the explosion-proof proportional pressure reducing valve (8), the A port of the explosion-proof proportional pressure reducing valve (8) is connected to the pressurizing port of the water supply tank (1) through a one-way valve (9), the water outlet of the water supply tank (1) is connected to the P port of the explosion-proof electromagnetic proportional control valve (4), and the A port of the explosion-proof electromagnetic proportional control valve (4) is connected to the water inlet of the exhaust gas treatment tank; The water replenishment method comprises the following steps: S1: After the explosion-proof vehicle is started, the water level and temperature sensor (3) collects the water level signal and temperature signal in the exhaust gas treatment box in real time, and the angle sensor collects the throttle angle signal in real time and transmits it to the controller (2); S2: If the detected water level of the exhaust gas treatment box is less than 20% of the upper limit of the water level, the controller (2) adjusts the opening of the explosion-proof electromagnetic proportional control valve (4) to the maximum; if the detected water level of the exhaust gas treatment box is greater than or equal to 20% of the upper limit of the water level and less than 40% of the upper limit of the water level, the controller (2) adjusts the opening of the explosion-proof electromagnetic proportional control valve (4) to the middle position; if the detected water level of the exhaust gas treatment box is greater than or equal to 40% of the upper limit of the water level and less than 80% of the upper limit of the water level, the controller (2) controls the explosion-proof electromagnetic proportional control valve (4) according to the throttle angle signal and the temperature signal in the exhaust gas treatment box. The opening degrees of the explosion-proof electromagnetic proportional control valve (4) and the explosion-proof proportional pressure reducing valve (8), wherein the throttle angle and the opening degree of the explosion-proof electromagnetic proportional control valve (4) are in a linear relationship, and according to the throttle angle signal, the engine can be divided into an idle state, a partial load state, and a full throttle state, wherein in the idle state, the opening degree of the explosion-proof electromagnetic proportional control valve (4) is the smallest, and in the full throttle state, the opening degree of the explosion-proof electromagnetic proportional control valve (4) is the largest; if the detected water level of the exhaust gas treatment box is greater than or equal to 80% of the water level upper limit value, the controller (2) adjusts the opening degree of the explosion-proof electromagnetic proportional control valve (4) to the smallest; S3: Repeat step S2 until the explosion-proof vehicle stops.

2. The water replenishing method of the automatic water replenishing device for the exhaust gas treatment box of an explosion-proof vehicle according to claim 1, characterized in that: The explosion-proof vehicle adopts an explosion-proof electronic fuel injection engine, and an angle sensor is installed on the throttle.

3. The water replenishing method of the automatic water replenishing device for the exhaust gas treatment box of an explosion-proof vehicle according to claim 2, characterized in that: The controller (2) has an alarm signal output terminal, and the alarm signal output terminal is connected to the main controller of the explosion-proof vehicle.

4. A water replenishing method for an automatic water replenishing device for an explosion-proof vehicle exhaust treatment box according to claim 1, characterized in that: if it is detected that the water temperature of the exhaust treatment box is not higher than a preset temperature, the explosion-proof electromagnetic proportional control valve (4) and the explosion-proof proportional pressure reducing valve (8) maintain the original state adjusted according to the throttle angle signal; If the detected water temperature of the exhaust gas treatment box is higher than a preset temperature and the opening degree of the explosion-proof electromagnetic proportional control valve (4) is less than a maximum value, the controller (2) controls the explosion-proof electromagnetic proportional control valve (4) to increase the opening degree; If the detected water temperature of the exhaust gas treatment box is higher than the preset temperature and the opening degree of the explosion-proof electromagnetic proportional control valve (4) is at its maximum, after a first preset time, if the temperature still exceeds the standard, the controller (2) controls the explosion-proof proportional pressure reducing valve (8) to increase the air pressure entering the water supply tank (1); if the controller (2) controls the explosion-proof proportional pressure reducing valve (8) to make the air pressure entering the water supply tank (1) reach the maximum value and after a second preset time, the detected water temperature of the exhaust gas treatment box is still higher than the preset temperature value, the controller (2) sends an alarm signal to the main controller of the explosion-proof vehicle, and at the same time, the main controller of the explosion-proof vehicle controls the throttle output to the minimum value, so that the engine is in an idling state, and the explosion-proof vehicle stops.

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