Cooling fan dust removal system and method and mining dump truck

Abstract

The invention discloses a cooling fan dust removal system and method and a mining dump truck, and the system comprises a fan rotating speed presumption module which is used for detecting and calculating the rotating speed of an engine cooling fan; the control judgment module is used for judging whether fan dust removal is allowed to be executed or stopped according to the collected signals and data; and the dust removal execution control module is used for controlling the dust removal execution mechanism and the hydraulic cooling fan according to the judgment result of the control judgment module. According to the cooling fan dust removal system, automatic dust removal can be achieved, extra operation of personnel is not needed, the cooling air volume of the fan is guaranteed, meanwhile, the service life of the fan and the bearing can be prolonged, and the efficiency declining trend of a cooling system is slowed down. On the basis of vehicle state parameters including vehicle parking time, vehicle starting time, windscreen wiper water spraying frequency, working states of other gas path system components and the like, the dust removal time and time are reasonably controlled, and fine control is achieved.

Description

Technical Field

[0001] The invention relates to a cooling fan dust removal system and method, and a mining dump truck, and belongs to the field of mining dump truck control. Background Art

[0002] Mining dump trucks are widely used in open-pit mining, where the working environment is harsh, with muddy and gravel roads, thick floating dust and large amounts of dust. Dust falling on the cooling fan will increase the fan load and cause the air volume to decrease. In addition, it will also cause the cooling fan blades to be offset and unbalanced, generating vibration and noise, accelerating wear and affecting the life of the fan bearing components and the fan.

[0003] At present, in order to ensure the safety of personnel, the cooling fans of mining dump trucks are often installed with protective nets or other isolation devices to protect maintenance personnel from being harmed by the rotating fans, which also makes it extremely inconvenient to clean the blades of the cooling fans. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a cooling fan dust removal system and method, and a mining dump truck, which can realize automatic dust removal without the need for additional human operation, ensure the fan heat dissipation air volume, and at the same time extend the life of the fan and bearings to ensure the efficiency of the cooling system.

[0005] In order to achieve the above object, the present invention adopts a heat dissipation fan dust removal system, comprising:

[0006] A fan speed estimation module is used to detect and estimate the speed of the engine cooling fan;

[0007] A control judgment module determines whether to allow or terminate fan dust removal based on collected signals and data, wherein the collected signals include engine speed, air circuit pressure, and pneumatic component working status, and the collected data include the system time point when dust removal was started last time; the control judgment module includes a dust removal interval time calculation unit and a dust removal mode determination unit, wherein the dust removal interval time calculation unit is used to preset a maximum interval dust removal time and calculate the dust removal interval time according to the wiper water spraying frequency, and the dust removal mode determination unit is used to determine the dust removal mode required for this dust removal process according to the downtime of the mining dump truck;

[0008] The dust removal execution control module is used to control the dust removal actuator and the hydraulic cooling fan according to the judgment result of the control judgment module; the dust removal actuator includes a power source and is equipped with an air compressor as an air source. The compressed air generated by the air source is cooled by a cooling pipe and dried by an air dryer, and then stored in an air storage cylinder. When the control judgment module determines that fan dust removal is allowed, the compressed gas is blown from the air nozzle to the rotating fan blades.

[0009] In some embodiments, the fan speed estimation module obtains the engine speed, water temperature and intercooler charge air temperature through the engine controller, and estimates the changing engine cooling fan speed.

[0010] In some embodiments, the control judgment module detects the engine speed and determines whether the engine is working based on the engine speed, and then determines whether the air compressor is working; the control judgment module detects the air circuit pressure through a pressure sensor, and the control judgment module reads the system time node of the last dust removal start from the memory, and stores the system time node of the current dust removal start.

[0011] In some embodiments, the control judgment module records the engine working time. When the engine starts or reaches the dust removal interval, the air circuit pressure is detected to be higher than a threshold and lasts for a period of time, the pneumatic components are in a non-working state, and the engine cooling fan speed is greater than a preset speed threshold. The control judgment module determines that dust removal is allowed; the pneumatic components include a pneumatic differential lock.

[0012] In some embodiments, the dust removal interval is inversely proportional to the wiper water spraying frequency.

[0013] In some embodiments, the dust removal mode determination unit is used to determine the dust removal mode required for the dust removal process according to the vehicle parking time, and the dust removal mode includes:

[0014] The first mode: dust removal is performed for 2 seconds at a time;

[0015] Second mode: Dust removal for 2 seconds twice with an interval of 10 seconds;

[0016] When the vehicle downtime does not exceed the preset threshold, the first mode is activated, otherwise, the second mode is activated.

[0017] In some embodiments, when the control judgment module determines that the fan dust removal is allowed to be executed, the dust removal execution control module controls the dust removal actuator and the hydraulic cooling fan;

[0018] When dust removal is allowed, a request is made to turn on the hydraulic cooling fan. After the hydraulic cooling fan rotates, dust removal is performed. After dust removal is completed, the request is turned off.

[0019] When dust removal is suspended, the dust removal actuator controls the opening and closing of the air path dust removal solenoid valve through the programmable controller; during the dust removal process, changes in conditions will cause the dust removal to be suspended. After the dust removal is suspended, it waits for the next new dust removal execution to be allowed and will not continue the current dust removal.

[0020] In some embodiments, the air nozzle in the dust removal actuator is arranged on the air outlet side of the fan, with an angle parallel to the tangent plane of the inner edge of the fan blade, and the air nozzle is elliptical.

[0021] A second aspect of the present invention provides a cooling fan dust removal method, based on the cooling fan dust removal system, comprising the following steps:

[0022] S1, estimate the engine fan speed, collect the pressure status of the vehicle air system and the working status of each component, estimate the time node of the dust removal system, determine the dust removal mode, and determine whether the dust removal is allowed to be executed through the control judgment module;

[0023] S2: When fan dust removal is allowed, a request is made to turn on the hydraulic cooling fan. After the hydraulic cooling fan rotates, the solenoid valve is energized to perform dust removal in accordance with the corresponding dust removal mode. The request is turned off after the dust removal execution time ends. When dust removal is terminated during the dust removal execution, the next new dust removal execution permission is waited for and the current dust removal is no longer continued.

[0024] S3. Store the system time of this dust removal.

[0025] A third aspect of the present invention provides a mining dump truck, on which the cooling fan dust removal system is installed.

[0026] Compared with the prior art, the cooling fan dust removal system of the present invention can realize automatic dust removal without additional human operation, ensure the fan cooling air volume, and at the same time extend the life of the fan and bearings, and slow down the trend of cooling system efficiency decline. The present invention reasonably controls the timing and time of dust removal based on vehicle status parameters including vehicle parking time, vehicle start time, windshield wiper spray frequency and other air path system component working status parameters, and realizes refined control. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a structural schematic diagram of a gas circuit of the present invention;

[0029] Figure 2 A schematic diagram of an installation structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the structural principle of the present invention;

[0031] Figure 4 The working principle of the control judgment module of the present invention is shown in FIG. Figure 1 ;

[0032] Figure 5 The working principle of the control judgment module of the present invention is shown in FIG. Figure 2 ;

[0033] Figure 6 It is a schematic diagram of the working principle of the dust removal mode determination unit of the present invention;

[0034] Figure 7 A schematic diagram of the working principle of the dust removal execution control module of the present invention;

[0035] In the figure: 1. engine, 2. air compressor, 3. cooling pipe, 4. air dryer, 5. air storage cylinder, 6. pressure sensor, 7. air path dust removal solenoid valve, 8. air nozzle, 9. engine cooling fan, 10. hydraulic cooling fan, 11. intercooler radiator, 12. elbow, 13. bracket, 14. rubber sleeve clamp, 15. fastening assembly, 16. air pipe. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present application are described in detail below with the help of accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0037] Combination Figure 3 As shown, a heat dissipation fan dust removal system includes a fan speed estimation module, a control judgment module and a dust removal execution control module;

[0038] The fan speed estimation module is used to detect and estimate the speed of the engine cooling fan;

[0039] The control judgment module determines whether to allow or terminate fan dust removal based on the collected signals and data. The collected signals include engine speed, air circuit pressure, and pneumatic component working status. The collected data includes the system time point when dust removal was started last time. The control judgment module includes a dust removal interval calculation unit and a dust removal mode determination unit. The dust removal interval calculation unit is used to preset the maximum interval dust removal time and calculate the dust removal interval time according to the windshield wiper water spraying frequency. Generally, if the windshield wiper sprays water frequently, there will be a lot of dust in the air, and the corresponding fan blades will have a lot of dust, so the number of dust removals needs to be increased, that is, the dust removal interval time is inversely proportional to the windshield wiper water spraying frequency. The dust removal mode determination unit is used to determine the dust removal mode required for this dust removal process according to the downtime of the mining dump truck.

[0040] The dust removal execution control module is used to control the dust removal actuator and the hydraulic cooling fan according to the judgment result of the control judgment module; the dust removal actuator includes a power source (such as an engine) and is equipped with an air compressor as an air source. The compressed air generated by the air source is cooled by a cooling pipe and dried by an air dryer, and then stored in an air storage cylinder. When the control judgment module determines that fan dust removal is allowed, the compressed gas is blown from the air nozzle to the rotating fan blades.

[0041] In some embodiments, the fan speed estimation module obtains the engine speed, water temperature and intercooler charge air temperature through the engine controller, and estimates the changing engine cooling fan speed. Different estimation methods are used for different types of cooling fans:

[0042] Cooling fan speed = p × engine speed × transmission ratio; although the estimated speed accuracy is not high, it is sufficient to meet the use requirements; for example,

[0043] 1) For electronically controlled silicone oil clutch fan:

[0044] The value of P depends on the control strategy of the cooling fan. Each manufacturer has different strategies. For example, the one currently used by the applicant is:

[0045] P1 = (T11-T10)*4, T11 is water temperature, T10 = 85°C;

[0046] P2 = (T21-T20)*5, T21 is the intercooler charge air temperature, T20 = 55°C;

[0047] There is a fixed transmission ratio between the engine and the fan pulley;

[0048] 2) For direct-connected fans

[0049] p is 100%;

[0050] There is a fixed transmission ratio between the engine and the fan pulley;

[0051] 3) For silicone oil clutch fan, it is related to the characteristics of silicone oil.

[0052] In some embodiments, Figure 1 As shown, the dust removal actuator includes an engine 1, an air compressor 2, a cooling pipe 3, an air dryer 4, an air storage cylinder 5, an air path dust removal solenoid valve 7 and a programmable controller, etc.;

[0053] The engine 1 provides a power source for the dump truck. The compressor 2 is connected to the engine 1 to generate compressed air in real time and continuously. The generated compressed air reaches the cooling pipe 3 through the air pipe, is cooled by the cooling pipe 3, reaches the air dryer 4, and is stored in the air storage cylinder 5 after drying. The air storage cylinder 5 is equipped with a constant pressure valve to ensure that the pressure does not exceed the threshold value; the air storage cylinder 5 is connected to a plurality of air nozzles 8 through a pipeline, and an air path dust removal solenoid valve 7 is installed on the pipeline between the air storage cylinder 5 and the air nozzle 8;

[0054] The air reservoir 5 provides compressed air for releasing the parking brake of the vehicle, applying differential lock control and air horn, and also provides compressed air for the dust removal actuator; the pressure sensor 6 is arranged in the air circuit to detect the pressure of the air circuit and output it to the programmable controller in the form of an electrical signal;

[0055] The air circuit dust removal solenoid valve 7 is controlled by a programmable controller. When the air circuit dust removal solenoid valve 7 is opened, the compressed air is blown to the blades of the engine cooling fan 9 and the blades of the hydraulic cooling fan 10 through the air nozzle 8. As a part of the hydraulic system of the dump truck, the hydraulic cooling fan 10 is also controlled by the programmable controller through the hydraulic solenoid valve.

[0056] In some embodiments, Figure 2 As shown, the intercooler radiator 11 is located in front of the engine cooling fan 9. The engine cooling fan 9 rotates to suck in cold air from the front of the intercooler radiator 11 (the dotted arrow is the air inlet direction); the engine cooling fan 9 is connected to the engine, and its rotation speed is often related to the current coolant temperature and the engine speed;

[0057] The air nozzle 8 is arranged on the air outlet side of the engine cooling fan 9. The air nozzle 8 is elliptical, and the angle of the air nozzle 8 is parallel to the tangent plane of the inner edge of the fan blade. The air nozzle 8 is connected to the air pipe 16 through the bracket 13 and the elbow 12. The bracket 13 provides support for the air nozzle 8 and the elbow 12. The bracket 13 is fixedly installed on the vehicle structure through the fastening assembly 15. At the same time, the air pipe 16 is fixed to the bracket 13 through the rubber sleeve clamp 14 and the fastening assembly 15. The fastening assembly 15 can be bolts, nuts, etc.

[0058] The programmable controller includes a memory as a data storage device, a system clock, a control judgment module and a dust removal execution control module. In the memory, in addition to the running program, the system time of each event recorded is also stored.

[0059] On the input side of the programmable controller, a pressure sensor 6, a wiper spray switch and a differential lock switch are electrically connected. The signal measured by the pressure sensor 6 is smoothed and filtered to obtain the pressure value of the air circuit system, which is input into the control judgment module. The control judgment module receives the wiper spray switch signal, calculates and counts its working frequency; the programmable controller obtains the working state of the differential lock through the traction controller or the differential lock switch. In order to ensure that the differential lock is quickly and smoothly engaged, it is necessary to ensure that the air circuit provides sufficient pneumatic pressure, so it is necessary to detect the differential lock state and give priority to the control of the differential lock. On the other hand, on the output side of the programmable controller, a hydraulic cooling fan solenoid valve and an air circuit dust removal solenoid valve 7 are electrically connected. The control judgment module of the programmable controller is electrically connected to the engine controller, and information can be exchanged between them. In this way, the control judgment device can obtain various information required such as the engine speed and coolant temperature from the engine controller.

[0060] In some embodiments, Figure 4 As shown, the dust removal interval time calculation unit in the control judgment module receives the engine speed information from the engine controller, analyzes the engine speed change, and thus determines whether the engine is started. After the engine is started, the dust removal interval time is calculated.

[0061] like Figure 5 As shown, the preset maximum dust removal interval is 12 hours. The programmable controller records the number of wiper water sprays n within 72 hours of engine operation, thereby calculating the wiper water spray frequency, and the obtained frequency value is updated every 2 hours. Dust removal interval T = k*12 / n hours, k is a positive coefficient.

[0062] The time of the last dust removal execution and the time of this engine start are read from the memory. If the start time is less than one hour from the last dust removal execution time, the first dust removal after starting the engine this time will not be executed. Otherwise, dust removal will be executed.

[0063] When the engine is started and the first dust removal is not performed, the first dust removal time node is T hours after the engine is started, and then the next dust removal time node is every T hours after the engine is running. If the first dust removal is performed, the next dust removal time node is every T hours after the engine is running.

[0064] like Figure 4 As shown, when the dust removal time node is reached, it is determined whether the pressure value of the air circuit system is greater than the preset threshold and lasts for a period of time to ensure that the compressed air storage is sufficient. At this time, based on the coolant temperature and engine speed, it is determined whether the engine cooling fan is rotated by the engine linkage, and the fan speed range is calculated to determine whether it is higher than the preset speed range threshold. If it is higher than the threshold, the next step of judgment is performed.

[0065] In order to ensure that the differential lock is engaged quickly and smoothly, it is necessary to ensure that the air circuit provides sufficient pneumatic pressure and detect the working status of the pneumatic components. If the differential lock is in or about to be locked, dust removal will not be allowed. When dust removal is allowed, the dust removal mode is determined.

[0066] like Figure 6 As shown, the programmable controller reads the last engine shutdown system time from the storage and records the current engine start time. When the time difference between the latter and the former exceeds 72 hours, the second dust removal mode is executed during the first dust removal operation, otherwise, the first mode is executed.

[0067] In some embodiments, Figure 7 As shown, when the dust removal mode is determined, dust removal execution control is performed. When dust removal is allowed to be executed, a request is made to open the hydraulic cooling fan 10. After receiving the request, the controller of the hydraulic system controls the rotation of the hydraulic cooling fan 10 through the hydraulic solenoid valve. When the speed of the hydraulic cooling fan 10 tends to be stable and lasts for a period of time, the air circuit dust removal solenoid valve 7 is opened, and the time to open the air circuit dust removal solenoid valve 7 is selected according to the dust removal mode.

[0068] When the dust removal mode is the first dust removal mode, the air path dust removal solenoid valve 7 is opened for 2 seconds, and the compressed air in the air reservoir 5 is blown to the rotating engine cooling fan 9 and the hydraulic cooling fan 10 through the air path dust removal solenoid valve 7, the air pipe 16 and the air nozzle 8;

[0069] When the dust removal mode is the second dust removal mode, the gas path dust removal solenoid valve 7 is also opened for 2 seconds. After 2 seconds, the gas path dust removal solenoid valve 7 is closed and waits for 10 seconds.

[0070] The air compressor 2 continues to generate compressed air in real time, but in order to ensure that the pressure of the air tank 5 is stable and will not drop significantly, it still waits for 10 seconds. At this time, the air compressor 2 replenishes the consumed compressed air for the air tank 5 in time to ensure the normal use of the parking release function. After 10 seconds, the air circuit dust removal solenoid valve 7 opens again for 2 seconds, and the compressed air blows to the rotating engine cooling fan 9 and hydraulic cooling fan 10 again. When the dust removal is completed, the air circuit dust removal solenoid valve 7 is closed, and the hydraulic cooling fan 10 continues to rotate according to the control of the hydraulic system controller to provide heat dissipation for the hydraulic system, or no heat dissipation is required, and the machine stops and waits. When during the dust removal process, the engine suddenly stops, the pneumatic system pressure drops sharply, or the differential differential lock request is applied, the dust removal process is terminated, the air circuit dust removal solenoid valve 7 is closed, and the hydraulic cooling fan 10 is no longer requested to rotate. When the dust removal process is terminated, wait for the next dust removal to be executed, and do not continue the unfinished dust removal process.

[0071] A second aspect of the present invention provides a cooling fan dust removal method, based on the cooling fan dust removal system, comprising the following steps:

[0072] S1, estimate the engine fan speed, collect the pressure status of the vehicle air system and the working status of each component, estimate the time node of the dust removal system, determine the dust removal mode, and determine whether the dust removal is allowed to be executed through the control judgment module;

[0073] S2: When fan dust removal is allowed, a request is made to turn on the hydraulic cooling fan. After the hydraulic cooling fan rotates, the solenoid valve is energized to perform dust removal in accordance with the corresponding dust removal mode. The request is turned off after the dust removal execution time ends. When dust removal is terminated during the dust removal execution, the next new dust removal execution permission is waited for and the current dust removal is no longer continued.

[0074] S3. Store the system time of this dust removal.

[0075] A third aspect of the present invention provides a mining dump truck, on which the cooling fan dust removal system is installed.

[0076] The cooling fan dust removal system of the present invention can realize automatic dust removal without additional human operation, ensure the fan cooling air volume, and at the same time can extend the life of the fan and bearings, and slow down the trend of cooling system efficiency decline. The present invention reasonably controls the timing and time of dust removal based on vehicle status parameters including vehicle parking time, vehicle start time, windshield wiper spray frequency and other air path system component working status parameters to achieve refined control.

[0077] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cooling fan dust removal system, characterized in that: include: A fan speed estimation module is used to detect and estimate the speed of the engine cooling fan; A control judgment module determines whether to allow or terminate fan dust removal based on collected signals and data, wherein the collected signals include engine speed, air circuit pressure, and pneumatic component working status, and the collected data include the system time point when dust removal was started last time; the control judgment module includes a dust removal interval time calculation unit and a dust removal mode determination unit, wherein the dust removal interval time calculation unit is used to preset a maximum interval dust removal time and calculate the dust removal interval time according to the wiper water spraying frequency, and the dust removal mode determination unit is used to determine the dust removal mode required for this dust removal process according to the downtime of the mining dump truck; The dust removal execution control module is used to control the dust removal actuator and the hydraulic cooling fan according to the judgment result of the control judgment module; the dust removal actuator includes a power source and is equipped with an air compressor as an air source. The compressed air generated by the air source is cooled by a cooling pipe and dried by an air dryer, and then stored in an air storage cylinder. When the control judgment module determines that fan dust removal is allowed, the compressed gas is blown from the air nozzle to the rotating fan blades.

2. A cooling fan dust removal system according to claim 1, characterized in that: The fan speed estimation module obtains the engine speed, water temperature and intercooler charge air temperature through the engine controller, and estimates the changing engine cooling fan speed.

3. The dust removal system for a cooling fan according to claim 1, characterized in that: The control judgment module detects the engine speed and determines whether the engine is working based on the engine speed, and then determines whether the air compressor is working; the control judgment module detects the air circuit pressure through the pressure sensor, and the control judgment module reads the system time node of the last dust removal start from the memory, and stores the system time node of the current dust removal start.

4. A cooling fan dust removal system according to claim 1 or 3, characterized in that: The control judgment module records the engine working time. When the engine starts or reaches the dust removal interval, the air circuit pressure is detected to be higher than the threshold and lasts for a period of time, the pneumatic components are in a non-working state, and the engine cooling fan speed is greater than the preset speed threshold. The control judgment module determines that dust removal is allowed; the pneumatic components include a pneumatic differential lock.

5. The dust removal system for a cooling fan according to claim 1, characterized in that: The dust removal interval is inversely proportional to the water spraying frequency of the wiper.

6. The cooling fan dust removal system according to claim 1, characterized in that: The dust removal mode determination unit is used to determine the dust removal mode required for the current dust removal process according to the vehicle parking time, and the dust removal mode includes: The first mode: dust removal is performed for 2 seconds at a time; Second mode: Dust removal for 2 seconds twice with an interval of 10 seconds; When the vehicle downtime does not exceed the preset threshold, the first mode is activated, otherwise, the second mode is activated.

7. The dust removal system for a cooling fan according to claim 1, characterized in that: When the control judgment module determines that the fan dust removal is allowed to be executed, the dust removal execution control module controls the dust removal actuator and the hydraulic cooling fan; When dust removal is allowed, a request is made to turn on the hydraulic cooling fan. After the hydraulic cooling fan rotates, dust removal is performed. After dust removal is completed, the request is turned off. When dust removal is suspended, the dust removal actuator controls the opening and closing of the air path dust removal solenoid valve through the programmable controller; during the dust removal process, changes in conditions will cause the dust removal to be suspended. After the dust removal is suspended, it waits for the next new dust removal execution to be allowed and will not continue the current dust removal.

8. The dust removal system for a cooling fan according to claim 1, characterized in that: The air nozzle in the dust removal actuator is arranged on the air outlet side of the fan, with an angle parallel to the tangent plane of the inner edge of the fan blade, and the air nozzle is elliptical.

9. A method for removing dust from a cooling fan, characterized in that: The cooling fan dust removal system according to any one of claims 1 to 8 comprises the following steps: S1, estimate the engine fan speed, collect the pressure status of the vehicle air system and the working status of each component, estimate the time node of the dust removal system, determine the dust removal mode, and determine whether the dust removal is allowed to be executed through the control judgment module; S2: When fan dust removal is allowed, a request is made to turn on the hydraulic cooling fan. After the hydraulic cooling fan rotates, the solenoid valve is energized to perform dust removal in accordance with the corresponding dust removal mode. The request is turned off after the dust removal execution time ends. When dust removal is terminated during the dust removal execution, the next new dust removal execution permission is waited for and the current dust removal is no longer continued. S3. Store the system time of this dust removal.

10. A mining dump truck, characterized in that: The mining dump truck is equipped with a cooling fan dust removal system as described in any one of claims 1 to 8.

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