Self-cleaning system for waste gas treatment box of mining explosion-proof diesel engine trackless rubber-tyred vehicle

Abstract

The invention belongs to the technical field of explosion-proof diesel engine tail gas treatment, and particularly relates to a self-cleaning system for a mine explosion-proof diesel engine trackless rubber-tyred vehicle waste gas treatment box. Comprising a waste gas treatment box, a function switching valve and a gas source, the waste gas treatment box comprises a waste gas inlet pipe, an oil sludge outlet and a gas outlet, and a pneumatic control stop valve is mounted on the oil sludge outlet; a working port of the function switching valve is connected with an air source, and two control ports of the function switching valve are respectively connected with the automatic cleaning valve assembly and the pneumatic control stop valve; opening and closing of the automatic cleaning valve assembly are controlled through an oil sludge weight feedback assembly in the waste gas treatment box, and the automatic cleaning valve assembly is connected with the pneumatic control stop valve; according to the self-cleaning system for the waste gas treatment box of the mining explosion-proof diesel engine trackless rubber-tyred vehicle, accumulation of oil sludge in the waste gas treatment box can be automatically judged, oil sludge sedimentation is achieved, meanwhile, discharging is automatically adjusted according to the deposition amount of the oil sludge, and liquid in the waste gas treatment box is kept clean.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion-proof diesel engine exhaust gas treatment, and particularly relates to a self-cleaning system for an exhaust gas treatment box of an explosion-proof diesel engine trackless rubber-tyred vehicle for mining. Background Art

[0002] The exhaust gas treatment box is an important component of explosion-proof diesel trackless rubber-tyred vehicles used in mining. It is mainly used to treat the exhaust gas emitted by the diesel engine and has the functions of physical cooling, dust reduction, and carbon deposit capture. However, during use, we found that the carbon deposits and incompletely burned diesel in the exhaust gas treatment box easily form viscous sludge after being vigorously stirred by water. In actual production, this sludge will cause the exhaust pipe of the exhaust gas treatment box to be blocked, resulting in high engine temperature and affecting the perception accuracy of the electrical sensors inside the exhaust gas treatment box. At present, the main way to solve this problem is to rely on the driver to manually clean the exhaust gas treatment box every day, which not only increases the labor intensity of the workers, but may also threaten the system performance of the explosion-proof diesel engine.

[0003] In order to solve the above problems, it is urgent to develop an exhaust gas treatment box self-cleaning system for mining explosion-proof diesel engine trackless rubber-tyred vehicles. Summary of the Invention

[0004] The invention aims to solve the problem that sludge formed by carbon deposits and incompletely burned diesel in an exhaust gas treatment box of a mining explosion-proof diesel trackless rubber-tyred vehicle is difficult to treat.

[0005] The present invention provides the following technical solutions: a self-cleaning system for an exhaust gas treatment box of an explosion-proof diesel engine trackless rubber-tyred vehicle for mining, comprising an exhaust gas treatment box, a function switching valve and an air source; The exhaust gas treatment box includes an exhaust gas discharge pipe, an oil sludge discharge outlet and a gas discharge outlet, and the oil sludge discharge outlet is equipped with an air-controlled shut-off valve; The working port of the function switching valve is connected to the air source, and the two control ports of the function switching valve are connected to the automatic cleaning valve assembly and the air-controlled stop valve respectively; The automatic cleaning valve assembly is controlled to open and close by the sludge weight feedback assembly in the exhaust gas treatment box, and the automatic cleaning valve assembly is connected to the air-controlled stop valve; The air-controlled stop valve has three modes: normally closed, normally open, and automatic switch; when the function switch valve is in the middle position, the air-controlled stop valve is in the normally closed mode; when the function switch valve is in the left position, the air-controlled stop valve is controlled by the automatic cleaning valve assembly and is in the automatic switch mode; when the function switch valve is in the right position, the air-controlled stop valve is in the normally open mode.

[0006] Furthermore, the exhaust gas treatment box is equipped with a water replenishing mechanism and an oil sludge precipitant replenishing mechanism; the water replenishing mechanism and the oil sludge precipitant replenishing mechanism are both connected to the gas source, and both use the pressurized gas of the gas source as driving force; the water replenishing mechanism and the oil sludge precipitant replenishing mechanism are controlled to start and stop by the float switch in the exhaust gas treatment box.

[0007] Furthermore, a lower sleeve is provided outside the outlet of the exhaust gas discharge pipe in the exhaust gas treatment box, and an upper sleeve is provided outside the outlet of the lower sleeve. The exhaust gas discharged from the exhaust gas discharge pipe enters the exhaust gas treatment box through the annular space gap between the exhaust gas discharge pipe and the lower sleeve, and the annular space gap between the upper sleeve and the lower sleeve.

[0008] Furthermore, the float switch includes a first float and a two-position two-way control valve A; the water outlet pipe of the water replenishment mechanism and the liquid outlet pipe of the sludge sedimentation agent replenishment mechanism are connected to the inlet of the two-position two-way control valve A; the first float is connected to the control mechanism of the two-position two-way control valve A, and the first float changes with the water level in the exhaust gas treatment box to control the on-off state of the two-position two-way control valve A.

[0009] Furthermore, the sludge weight feedback assembly includes a sludge pressure plate and a two-position two-way control valve B; The sludge pressure plate is located at the bottom of the exhaust gas treatment box. The sludge pressure plate is connected to the control mechanism of the two-position two-way control valve B. A spring is connected between the sludge pressure plate and the exhaust gas treatment box. The spring pushes the sludge pressure plate upward to close the two-position two-way control valve B. After the sludge pressure plate is pressed down by the sludge, the two-position two-way control valve B opens. The automatic cleaning valve assembly includes a water tank, a second float and a two-position two-way control valve C; the water tank is placed outside the exhaust gas treatment tank; the water tank is connected to the outlet of the two-position two-way control valve B, and a normally open third adjustable flow valve is provided at the bottom of the water tank. The second float is connected to the control mechanism of the two-position two-way control valve C, and the inlet of the two-position two-way control valve C is connected to the air source, and the outlet is connected to the air-controlled stop valve; the flow rate difference between the water inlet of the water tank and the water outlet of the third adjustable flow valve causes water to accumulate in the water tank, driving the second float to float and control the on-off state of the two-position two-way control valve C.

[0010] Furthermore, the water replenishment mechanism includes a water replenishment tank, which is connected to the gas source. The water outlet pipe of the water replenishment tank is connected to the exhaust gas treatment box after passing through the first adjustable flow valve, the first one-way valve and the two-position two-way control valve in sequence.

[0011] Furthermore, the sludge precipitant replenishing mechanism includes a sludge precipitant tank, which is connected to the gas source, and the liquid outlet pipe of the sludge precipitant tank is connected to the exhaust gas treatment box after passing through the second adjustable flow valve, the second one-way valve and the two-position two-way control valve in sequence.

[0012] Furthermore, the gas source is divided into two branches after passing through the safety pressure reducing valve assembly and is respectively connected to the water replenishment mechanism and the sludge precipitant replenishment mechanism.

[0013] Furthermore, the safety pressure reducing valve assembly includes a pressure reducing valve, a pressure gauge, a third one-way valve and a relief valve. The pressure reducing valve is used to reduce the air pressure of the air source and output it through the third one-way valve. The pressure gauge is connected between the pressure reducing valve and the third one-way valve, and the relief valve is arranged after the third one-way valve.

[0014] Furthermore, the function switching valve is a three-position three-way manual control valve.

[0015] Compared with the prior art, the advantages of the present invention are: The present invention provides a self-cleaning system for the exhaust gas treatment tank of explosion-proof diesel trackless rubber-tyred mining vehicles. This system automatically detects sludge accumulation within the tank and allows for its sedimentation. It also automatically adjusts discharge based on the amount of sludge deposited, maintaining the cleanliness of the liquid within the tank. This ensures that related components operate in a healthy environment, minimizing human intervention and reducing worker workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the self-cleaning system of the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle; Figure 2 is a perspective view of an exhaust gas treatment box; Figure 3 A cross-sectional view of the exhaust gas treatment box.

[0017] In the figure: 1-air source; 2-function switching valve; 3-exhaust gas treatment box; 31-air control stop valve; 32-float switch; 321-first float; 322-two-position two-way control valve A; 33-automatic cleaning valve assembly; 331-oil sludge pressure plate; 332-two-position two-way control valve B; 333-second float; 334-third adjustable flow valve; 335-two-position two-way control valve C; 34-exhaust gas discharge pipe; 35-explosion-proof fence seat; 36-lower sleeve; 37-upper sleeve; 4-safety pressure reducing valve assembly; 41-pressure reducing valve; 42-pressure gauge; 43-third one-way valve; 44-overflow valve; 5-water supply tank; 6-oil sludge sedimentation agent tank; 7-first adjustable flow valve; 8-second adjustable flow valve; 9-first one-way valve; 10-second one-way valve. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0019] like Figure 1 、 Figure 2 、 Figure 3 As shown: A self-cleaning system for an exhaust gas treatment box of an explosion-proof diesel engine trackless rubber-tyred vehicle for mining, comprising an exhaust gas treatment box 3, a function switching valve 2 and an air source 1; Gas source 1 is taken from the gas tank of mining explosion-proof diesel engine trackless rubber-wheeled vehicle, and the gas pressure should be maintained at 7 bar ± 0.5 bar; The exhaust gas treatment box 3 is used to carry out explosion-proof and clean treatment on the exhaust gas emitted by the explosion-proof diesel engine trackless rubber-tyred vehicle; The exhaust gas treatment box 3 includes an exhaust gas discharge pipe 34, an oil sludge discharge port, and a gas discharge port. The outlet of the exhaust gas discharge pipe 34 is located below the liquid level of the exhaust gas treatment box 3, and the gas discharge port is located at the top of the exhaust gas treatment box 3. The exhaust gas enters from the exhaust gas discharge pipe 34 and is discharged from the top of the exhaust gas treatment box 3 after water treatment. An air-controlled stop valve 31 is installed on the oil sludge discharge port. The flow diameter of the air-controlled stop valve 31 is greater than 50 mm, which can ensure that the oil sludge is quickly discharged. The working port of the function switching valve 2 is connected to the air source 1, and the two control ports of the function switching valve 2 are connected to the automatic cleaning valve assembly 33 and the air control stop valve 31 respectively; The automatic cleaning valve assembly 33 is controlled to open and close by the sludge weight feedback assembly in the exhaust gas treatment box 3, and the automatic cleaning valve assembly 33 is connected to the air-controlled stop valve 31; The function switching valve 2 is a three-position three-way manual control valve. The function switching valve 2 controls the wastewater discharge status of the waste gas treatment box 3 by switching the position; the air-controlled stop valve 31 can be driven by the air source 1 controlled by the function switching valve 2 or the automatic cleaning valve assembly 33 to realize the closing function; the air-controlled stop valve 31 has three modes: normally closed, normally open, and automatic switching; when the function switching valve 2 is in the middle position, the air-controlled stop valve 31 is in the normally closed mode; when the function switching valve 2 is in the left position, the air-controlled stop valve 31 is controlled by the automatic cleaning valve assembly 33 and is in the automatic switching mode; when the function switching valve 2 is in the right position, the air-controlled stop valve 31 is in the normally open mode.

[0020] The exhaust gas treatment box 3 is equipped with a water replenishing mechanism and an oil sludge precipitant replenishing mechanism; the water replenishing mechanism and the oil sludge precipitant replenishing mechanism are both connected to the gas source 1, and both use the pressurized gas of the gas source 1 as the driving force; the water replenishing mechanism and the oil sludge precipitant replenishing mechanism are controlled to start and stop by the float switch 32 in the exhaust gas treatment box 3.

[0021] The exhaust gas treatment box 3 is made of 304 stainless steel with strong corrosion resistance. A lower sleeve 36 is provided outside the outlet of the exhaust gas discharge pipe 34 in the exhaust gas treatment box 3, and an upper sleeve 37 is provided outside the outlet of the lower sleeve 36. The exhaust gas discharged from the exhaust gas discharge pipe 34 enters the exhaust gas treatment box 3 through the annular space gap between the exhaust gas discharge pipe 34 and the lower sleeve 36, and the annular space gap between the upper sleeve 37 and the lower sleeve 36; the flow rate of the exhaust gas discharged from the exhaust gas discharge pipe 34 is slowed down by the upper sleeve 37 and the lower sleeve 36 to prevent the exhaust gas from disturbing the liquid inside the exhaust gas treatment box 3.

[0022] An explosion-proof fence seat 35 is installed on the top of the exhaust gas treatment box 3 for installing an explosion-proof fence.

[0023] The float switch 32 includes a first float 321 and a two-position two-way control valve A322; the water outlet pipe of the water replenishment mechanism and the liquid outlet pipe of the sludge sedimentation agent replenishment mechanism are connected to the inlet of the two-position two-way control valve A322; the first float 321 is connected to the control mechanism of the two-position two-way control valve A322, and the first float 321 controls the on-off state of the two-position two-way control valve A322 as the water level in the exhaust gas treatment box 3 changes.

[0024] The sludge weight feedback component includes a sludge pressure plate 331 and a two-position two-way control valve B332; the sludge pressure plate 331 is located at the bottom of the exhaust gas treatment box 3, and the sludge pressure plate 331 is connected to the control mechanism of the two-position two-way control valve B332. A spring is connected between the sludge pressure plate 331 and the exhaust gas treatment box 3. When sludge is deposited on the sludge pressure plate 331 (reaching the preset weight), the sludge pressure plate 331 is pressed down by the sludge, and the two-position two-way control valve B332 opens; when the sludge decreases, the sludge pressure plate 331 moves upward under the action of the spring, thereby driving the two-position two-way control valve B332 to close.

[0025] The automatic cleaning valve assembly 33 includes a water tank, a second float 333, and a two-position, two-way control valve C335. The water tank is located outside the exhaust gas treatment tank 3 and is connected to the outlet of the two-position, two-way control valve B332. A normally open third adjustable flow valve 334 is located at the bottom of the water tank. The second float 333 is connected to the control mechanism of the two-position, two-way control valve C335. The inlet of the two-position, two-way control valve C335 is connected to the air source 1, and the outlet is connected to the air-controlled stop valve 31. The flow rate difference between the water inlet of the water tank and the water outlet of the third adjustable flow valve 334 causes water to accumulate in the water tank, driving the second float 333 to float and control the on / off state of the two-position, two-way control valve C335. The flow adjustment value of the third adjustable flow valve 334 is 0.3 to 0.5 times the flow rate of the two-position, two-way control valve C335.

[0026] The air-controlled stop valve 31 is in the automatic switch mode. When the sludge deposited on the sludge pressure plate 331 presses the sludge pressure plate 331 down, it indicates that there is too much sludge in the exhaust gas treatment box 3 and it needs to be discharged. The sludge pressure plate 331 moves downward to trigger the two-position two-way control valve C335 to open. The liquid in the exhaust gas treatment box 3 enters the water tank of the automatic cleaning valve assembly 33 through the connecting pipe. At this time, the water inlet flow rate in the water tank is greater than the water outlet flow rate of the third adjustable flow valve 334, and the water level in the water tank rises, bringing The second float 333 is moved upward, controlling the opening of the two-position, two-way control valve C335. High-pressure gas from gas source 1 flows through the two-position, two-way control valve C335 to the air-controlled shut-off valve 31, which opens to discharge the waste. As the sludge at the bottom of the waste gas treatment tank 3 is drained, the sludge pressure plate 331 moves upward under the action of the spring, driving the two-position, two-way control valve B332 to close. This cuts off the air flow to the air-controlled shut-off valve 31, and the waste gas treatment tank 3 is automatically drained. After the liquid level in the waste gas treatment tank 3 drops, it is replenished by the water replenishment mechanism and the sludge precipitant replenishment mechanism.

[0027] The water replenishment mechanism includes a water replenishment tank 5, which is used to store water for the exhaust gas treatment tank 3. The water replenishment tank 5 is connected to the gas source 1, and the outlet pipe of the water replenishment tank 5 is connected to the exhaust gas treatment tank 3 after passing through the first adjustable flow valve 7, the first one-way valve 9 and the two-position two-way control valve A322 in sequence.

[0028] The sludge precipitant replenishing mechanism includes a sludge precipitant tank 6, which is used to store liquid agents for precipitating sludge. The sludge precipitant tank 6 is connected to the gas source 1, and the liquid outlet pipe of the sludge precipitant tank 6 is connected to the exhaust gas treatment tank 3 after passing through the second adjustable flow valve 8, the second one-way valve 10 and the two-position two-way control valve A322 in sequence.

[0029] The ratio of the setting values ​​of the first adjustable throttle valve 7 and the second adjustable throttle valve 8 is set according to the ratio of the sludge precipitant to the melt water.

[0030] When the liquid level in the waste gas treatment tank 3 drops, the first float 321 triggers the opening of the two-position, two-way control valve A322. Driven by air pressure, the reserve water in the water supply tank 5 flows into the waste gas treatment tank 3 through the first adjustable flow valve 7, the first check valve 9, and the two-position, two-way control valve A322. The chemical in the sludge precipitant tank 6 flows into the waste gas treatment tank 3 through the second adjustable flow valve 8, the second check valve 10, and the two-position, two-way control valve A322, where it reacts with the mixed liquid inside, causing the suspended sludge to settle. When the liquid level in the waste gas treatment tank 3 rises, the first float 321 triggers the closing of the two-position, two-way control valve A322, stopping the addition of water to the water supply tank 5 and the addition of chemical to the sludge precipitant tank 6.

[0031] A first one-way valve 9 and a second one-way valve 10 are provided to prevent the water supply tank 5 and the sludge sedimentation agent tank 6 from communicating with each other.

[0032] After passing through the safety pressure reducing valve assembly 4, the gas source 1 is divided into two branches and connected to the water replenishing mechanism and the sludge precipitant replenishing mechanism respectively; the safety pressure reducing valve assembly 4 is used to process the high-pressure gas of the gas source 1 and provide driving force for the water replenishing mechanism and the sludge precipitant replenishing mechanism.

[0033] The safety pressure relief valve assembly 4 includes a pressure reducing valve 41, a pressure gauge 42, a third check valve 43, and a relief valve 44. The pressure reducing valve 41 is used to reduce the pressure of the gas source 1 and output it through the third check valve 43. The pressure gauge 42 is connected between the pressure reducing valve 41 and the third check valve 43, and the relief valve 44 is located after the third check valve 43. The pressure reducing valve 41 reduces the pressure of the gas source 1 to 0.3 bar ± 0.05 bar and outputs it through the third check valve 43. The pressure gauge 42 is designed to monitor the operating status of the pressure reducing valve 41. To prevent pressure fluctuations caused by temperature changes in the water supply tank 5 and the sludge precipitation agent tank 6, a relief valve 44 is located after the third check valve 43. The set value of the relief valve 44 is between 0.4 bar and 0.45 bar.

[0034] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle, characterized by: It includes an exhaust gas treatment box (3), a function switching valve (2) and an air source (1); The waste gas treatment box (3) includes a waste gas discharge pipe (34), a sludge discharge outlet and a gas discharge outlet, and the sludge discharge outlet is equipped with a gas-controlled stop valve (31); The working port of the function switching valve (2) is connected to the air source (1), and the two control ports of the function switching valve (2) are respectively connected to the automatic cleaning valve assembly (33) and the air control stop valve (31); The automatic cleaning valve assembly (33) is controlled to open and close by the sludge weight feedback assembly in the exhaust gas treatment box (3), and the automatic cleaning valve assembly (33) is connected to the air-controlled stop valve (31); The air-controlled stop valve (31) has three modes: normally closed, normally open, and automatic switch; when the function switching valve (2) is in the middle position, the air-controlled stop valve (31) is in the normally closed mode; when the function switching valve (2) is in the left position, the air-controlled stop valve (31) is controlled by the automatic cleaning valve assembly (33) to be in the automatic switch mode; when the function switching valve (2) is in the right position, the air-controlled stop valve (31) is in the normally open mode.

2. The self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle according to claim 1 is characterized by: The waste gas treatment box (3) is equipped with a water replenishing mechanism and an oil sludge precipitant replenishing mechanism; the water replenishing mechanism and the oil sludge precipitant replenishing mechanism are both connected to the gas source (1), and both use the pressurized gas of the gas source (1) as a driving force; the water replenishing mechanism and the oil sludge precipitant replenishing mechanism are controlled to start and stop by a float switch (32) in the waste gas treatment box (3).

3. The self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle according to claim 2 is characterized by: In the exhaust gas treatment box (3), a lower sleeve (36) is provided outside the outlet of the exhaust gas discharge pipe (34), and an upper sleeve (37) is provided outside the outlet of the lower sleeve (36). The exhaust gas discharged from the exhaust gas discharge pipe (34) enters the exhaust gas treatment box (3) through the annular space between the exhaust gas discharge pipe (34) and the lower sleeve (36), and the annular space between the upper sleeve (37) and the lower sleeve (36).

4. The self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle according to claim 3 is characterized by: The float switch (32) comprises a first float (321) and a two-position two-way control valve A (322); the water outlet pipe of the water replenishment mechanism and the liquid outlet pipe of the sludge sedimentation agent replenishment mechanism are connected to the inlet of the two-position two-way control valve A (322); the first float (321) is connected to the control mechanism of the two-position two-way control valve A (322), and the first float (321) controls the on-off state of the two-position two-way control valve A (322) as the water level in the exhaust gas treatment box (3) changes.

5. The self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle according to claim 3 is characterized by: The oil sludge weight feedback assembly includes an oil sludge pressure plate (331) and a two-position two-way control valve B (332); The sludge pressure plate (331) is located at the bottom of the exhaust gas treatment box (3). The sludge pressure plate (331) is connected to the control mechanism of the two-position two-way control valve B (332). A spring is connected between the sludge pressure plate (331) and the exhaust gas treatment box (3). The spring pushes the sludge pressure plate (331) upward to close the two-position two-way control valve B (332). After the sludge pressure plate (331) is pressed down by the sludge, the two-position two-way control valve B (332) is opened. The automatic cleaning valve assembly (33) includes a water tank, a second float (333) and a two-position two-way control valve C (335); the water tank is placed outside the exhaust gas treatment box (3); the water tank is connected to the outlet of the two-position two-way control valve B (332), a normally open third adjustable flow valve (334) is provided at the bottom of the water tank, the second float (333) is connected to the control mechanism of the two-position two-way control valve C (335), the inlet of the two-position two-way control valve C (335) is connected to the air source (1), and the outlet is connected to the air-controlled stop valve (31); the flow rate difference between the water inlet of the water tank and the water outlet of the third adjustable flow valve (334) causes water to be stored in the water tank, driving the second float (333) to float and control the on-off state of the two-position two-way control valve C (335).

6. The self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle according to claim 4 is characterized by: The water replenishment mechanism comprises a water replenishment tank (5), the water replenishment tank (5) is connected to the gas source (1), and the water outlet pipe of the water replenishment tank (5) is connected to the exhaust gas treatment box (3) after passing through the first adjustable flow valve (7), the first one-way valve (9) and the two-position two-way control valve A (322) in sequence.

7. The self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle according to claim 4 is characterized by: The sludge precipitant replenishing mechanism comprises a sludge precipitant tank (6), the sludge precipitant tank (6) is connected to the gas source (1), and the liquid outlet pipe of the sludge precipitant tank (6) is connected to the exhaust gas treatment tank (3) after passing through the second adjustable flow valve (8), the second one-way valve (10) and the two-position two-way control valve A (322) in sequence.

8. The self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle according to claim 2 is characterized by: The gas source (1) is divided into two branches after passing through the safety pressure reducing valve assembly (4) and connected to the water replenishing mechanism and the sludge precipitant replenishing mechanism respectively.

9. The self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle according to claim 8 is characterized by: The safety pressure reducing valve assembly (4) comprises a pressure reducing valve (41), a pressure gauge (42), a third one-way valve (43) and a relief valve (44). The pressure reducing valve (41) is used to reduce the pressure of the gas source (1) and output it through the third one-way valve (43). The pressure gauge (42) is connected between the pressure reducing valve (41) and the third one-way valve (43). The relief valve (44) is provided after the third one-way valve (43).

10. The self-cleaning system for the exhaust gas treatment box of a mining explosion-proof diesel engine trackless rubber-tyred vehicle according to claim 1, characterized in that: The function switching valve (2) is a three-position three-way manual control valve.

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