Dust treatment method and device for pedestrian area of fully mechanized coal mining face

Abstract

The invention belongs to the technical field of coal mine dust prevention, and relates to a fully mechanized coal mining face pedestrian area dust treatment method and device.The device mainly comprises a hydraulic support, an injection dust removal device, a dust removal control box, a main control box and a coal mining machine, the hydraulic support is used for supporting a coal mining face, and the injection dust removal device is arranged at the top of the hydraulic support; the device is used for generating negative pressure to suck and purify dust-containing airflow in a pedestrian area below the hydraulic support. The dust removal control box receives working signals of the hydraulic support and the coal mining machine, controls the injection dust removal device and is electrically connected with the main control box and the automatic pressure regulating valve. A locator is arranged on the leeward side of the coal mining machine to identify the position of the coal mining machine The device purifies dust-containing airflow through spray injection, covers a roadway bottom plate and a dust production area of the scraper conveyor, captures and wets coal dust, reduces raised dust and transverse diffusion of dust, reduces the dust concentration of a pedestrian area, improves the working environment and reduces dust harm.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine dust prevention, and relates to a method and device for controlling dust in a pedestrian area of ​​a fully mechanized mining working face. Background Art

[0002] Dust prevention and control in fully mechanized mining faces has always been the focus and difficulty of dust prevention and control in coal mines. During coal mining operations, large amounts of dust are generated by coal mining machine drum cutting, hydraulic support column lowering and frame moving, coal seam collapse, and spalling. Tests show that without taking dust prevention measures, the original dust concentration in the fully mechanized mining face is as high as 1000mg / m3 or more, and the instantaneous total dust concentration during coal cutting and frame moving even exceeds 2000mg / m3. The fully mechanized mining face has a small working space, numerous electromechanical equipment, and a poor visual environment. Dust pollution not only seriously endangers the physical and mental health of the operators, but also seriously endangers the safety of coal mine production and equipment safety. However, due to the high wind speed, complex dust sources, and rapid dust diffusion rate of the fully mechanized mining face, dust prevention and control has always lacked ideal methods and measures.

[0003] The dust generated by coal cutting by coal mining machines is the main dust source of fully mechanized mining working faces. The dust source range includes the coal cutting areas of the front and rear drums of the coal mining machines and the collapse areas caused by the drums cutting coal. The space range is wide, the dust generation intensity is large, and it moves with the operation of the coal mining machines. Due to the small space and poor working conditions of the fully mechanized mining working face, the coal mining machine cannot be equipped with large-scale dust control and removal equipment. The main dust control methods are internal spray and external spray of the coal mining machine, and the dust reduction efficiency is about 50%. In recent years, attempts have been made to use the dust source tracking spray dust reduction technology of coal mining machines to control the dust on the coal mining working face, and high-pressure and high-flow spray is used to track and cover the drum coal cutting area. This method can reduce the dust generated by coal mining machines, but it causes water mist to diffuse on the working face, obstructing the line of sight and causing safety problems, wetting the workers' clothes, and causing the moisture content of coal to exceed the standard. Therefore, this method is currently rarely used. Internal and external spraying can only reduce about half of the dust generated by coal cutting. Part of the escaping dust moves to the leeward side with the wind flow, and part of the dust spreads to the pedestrian area. When the drum cuts coal, large pieces of coal seam that collapse continuously collide with the coal flow from the conveyor, causing serious dust on the bottom plate. Part of this dust is carried by the wind to the leeward side, and part of it spreads over the cable trough to the pedestrian area, seriously polluting the environment of the working face.

[0004] The lowering and moving of hydraulic supports is another major dust source in the fully mechanized mining face. According to the operating procedures, after the coal mining machine cuts the coal, the hydraulic supports should be lowered and moved in time. As the coal mining machine continues to cut coal, the hydraulic supports continue to lower and move the supports and produce dust. The hydraulic supports are mainly composed of a base, columns, top beams, shield beams, side guards, connecting rods and control systems. Their main functions include supporting the coal mining face, maintaining a safe working space and pushing the working face. They are a crucial pedestrian area. The hydraulic supports move forward with the mining of the fully mechanized mining face, which is a process of moving under pressure. During the moving process, the broken coal and rock fall from the gap between the side guard plates of the two adjacent hydraulic supports, and the fine dust particles spread rapidly under the action of the wind flow on the working face. Due to the obstruction of the equipment components in the hydraulic support area and the low wind speed, the continuous lowering and moving of the supports will generate and accumulate a large amount of dust, seriously polluting the downwind working area and causing great harm to the health of the workers in the pedestrian area below the supports. At present, there are three main measures to deal with dust generation during column lowering and frame moving: one is to install a spray on the top beam of the support, which is automatically turned on when the support column is lowered and the frame is moved, but this method will cause the pedestrian area below the support to be slippery and muddy, posing a safety risk; another measure is to arrange the spray on the side guard plate of the hydraulic support shield beam, and directly spray to wet the top plate to crush the coal body. Due to the fast speed of coal body breaking and falling, this method has limited wetting degree on the coal body, limited dust reduction effect, and the spray causes the pedestrian area to be slippery and muddy; another measure is to install a dust guide groove in the gap between two adjacent supports to prevent the broken coal body from falling in the pedestrian area, and guide it to the rear area of ​​the hydraulic support, but this method cannot prevent the fallen coal dust from spreading rapidly with the airflow and polluting the pedestrian area.

[0005] Therefore, in general, the current dust control effect in the pedestrian area of ​​the comprehensive mining working face is limited, and there is a lack of efficient and feasible control measures. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a method and device for dust control in the pedestrian area of ​​a comprehensive mining working face, by generating negative pressure through spray injection to suck the dust-containing airflow in the pedestrian area below the hydraulic support for purification, using spray to cover the dust-producing area of ​​the tunnel floor and the scraper conveyor, capturing moistened coal dust and reducing dust, and utilizing the suction effect generated by the spray to guide the dust-containing airflow around the fog field to migrate along the wind direction of the tunnel, thereby reducing the lateral diffusion of dust, reducing the dust concentration in the pedestrian area of ​​the comprehensive mining face, improving the working environment of the operators, and reducing the hazards of dust.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for controlling dust in the pedestrian area of ​​a fully mechanized mining face, comprising a coal mining machine, a main control box, a hydraulic support, an ejection dust removal device arranged in the top area of ​​the hydraulic support, and a dust removal control box arranged on the connecting rod of the hydraulic support; the ejection dust removal device is used to generate a negative pressure to suck the dust-laden airflow in the pedestrian area below the hydraulic support and purify it, and comprises a dust collecting hood, an air duct, a water inlet, an automatic pressure regulating valve, a water vapor ejector, a nozzle, an air guide tube and a mounting seat; the mounting seat hangs the ejection dust removal device on the top beam of the hydraulic support, and the dust collecting hood is arranged Below the hydraulic support, it is used to collect dust in the pedestrian area. After the pressurized water is adjusted to the required pressure through the automatic pressure regulating valve from the water inlet, it is sprayed into the water vapor ejector through the nozzle, generating a strong negative pressure in the water vapor ejector, and the dust-laden airflow is sucked in through the dust collecting hood and the air duct, and mixed with the spray and ejected from the air guide tube; the dust removal control box is used to receive the working signals of the hydraulic support and the coal mining machine, and control the ejection dust removal device; the dust removal control box is electrically connected to the main control box and the automatic pressure regulating valve, and can receive the signal of the locator; a locator is also provided on the leeward side of the coal mining machine to identify the working position of the coal mining machine in the tunnel.

[0008] Optionally, the dust collecting hood is arranged in one or more distributed arrangements, with a circular or rectangular front end and an inlet facing the dust-laden airflow below the hydraulic support.

[0009] Optionally, the air outlet direction of the air guide tube points to the lower right on the work surface elevation and points to the upper right on the work surface plane.

[0010] Optionally, the induced dust removal device and the dust removal control box are arranged at intervals on the hydraulic support of the comprehensive mining working face, and it is appropriate to configure one set for every 2-3 supports.

[0011] A method for controlling dust in pedestrian areas of a fully mechanized mining face, using a device for controlling dust in pedestrian areas of a fully mechanized mining face as described above, comprises the following steps:

[0012] S1, install and arrange all components, and set three working modes of the ejector dust removal device: high pressure mode, low pressure mode and standby mode, and realize linkage control through the dust removal control box, the main control box and the automatic pressure regulating valve;

[0013] S2, Governance Process:

[0014] S21, high pressure mode;

[0015] When the coal mining machine cuts coal and moves to the set distance range of the leeward side ejector dust removal device, the positioner sends a signal to the dust removal control box; after receiving the signal, the dust removal control box starts the ejector dust removal device and sets the automatic pressure regulating valve to high pressure; at this time, pressurized water is sprayed into the water vapor ejector through the nozzle, generating a strong negative pressure, sucking the dust-laden airflow in the pedestrian area below the hydraulic support, and mixing it with the spray and then spraying it out from the air guide tube, forming a large-scale fog field covering the coal body collapse, the spalling impacting the tunnel floor and the scraper conveyor area, capturing dust and moistening the coal dust, and at the same time using the suction effect generated by the spray to guide the dust-laden airflow to migrate along the tunnel wind direction, reducing the lateral diffusion of dust;

[0016] S22, low pressure mode;

[0017] When the coal mining machine is not within the set distance range and the hydraulic support is lowering the column and moving the frame, the main control box sends a frame moving signal to the dust removal control box; after receiving the signal, the dust removal control box sets the automatic pressure regulating valve to low pressure, and the induced dust removal device works in low-pressure spray mode; at this time, the negative pressure generated by the device sucks the dust-laden airflow in the pedestrian area, and after mixing with the spray, it is sprayed out from the air guide tube, covering the scraper conveyor area, wetting and settling the dust, and effectively controlling the dust generated when the column is lowered and the frame is moved;

[0018] S23, standby mode;

[0019] When the coal mining machine is not within the set distance range and the hydraulic support is not lowering the column and moving the frame, the ejector dust removal device is in standby mode, which does not consume water resources and avoids making the working surface slippery and muddy;

[0020] S3, cyclic operation;

[0021] As the coal mining machine cuts coal and the hydraulic support continuously lowers and moves its columns, the dust removal control box controls the ejection dust removal devices within the set distance range or at the column lowering and frame moving positions to switch to corresponding working modes in sequence according to the received signals, thereby achieving continuous and efficient dust control in the entire pedestrian area of ​​the comprehensive mining working face.

[0022] Optionally, the high pressure is ≥8MPa and the low pressure is <8MPa.

[0023] The beneficial effects of the present invention are:

[0024] 1) The present invention discloses a method and device for controlling dust in pedestrian areas of fully mechanized mining working faces. The method and device aim at the pollution of pedestrian areas of coal mining working faces by coal mining machine cutting coal dust and hydraulic support column lowering and frame moving dust. The method generates negative pressure by spraying to suck the dust-containing airflow in the pedestrian areas below the hydraulic support for purification. The method uses spray to cover the dust-producing areas of the roadway floor and the scraper conveyor to capture and moisten the coal dust and reduce the dust. The method uses the suction effect generated by the spray to guide the dust-containing airflow around the fog field to migrate along the wind direction of the roadway, thereby reducing the lateral diffusion of dust and reducing the dust concentration in the pedestrian areas of fully mechanized mining faces, thereby improving the working environment of the operators and reducing the dust hazards.

[0025] 2) The present invention provides a method and device for controlling dust in pedestrian areas of a fully mechanized mining face, wherein the ejection dust removal devices are arranged at certain intervals throughout the fully mechanized mining face, and dust control in pedestrian areas polluted by dust generated by coal mining machines and hydraulic support column lowering and frame shifting is achieved throughout the entire working face;

[0026] 3) The present invention provides a method and device for controlling dust in pedestrian areas of a fully mechanized mining face, which uses pressure water spray injection as the power for generating dust, has a compact structure, a small equipment size, no noise pollution, and does not affect the normal operation of the fully mechanized mining face;

[0027] 4) The present invention provides a method and device for controlling dust in pedestrian areas of a comprehensive mining working face. The induced dust suppression device adopts a high-pressure mode and a low-pressure mode respectively for dust generated by coal cutting and dust generated by hydraulic support column lowering and frame moving. Under the premise of effectively reducing dust concentration, the water consumption of the spray is minimized to avoid making the working face slippery and muddy.

[0028] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0030] Figure 1 It is a schematic diagram of the cross-section layout of the fully mechanized mining working face of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the ejection dust removal device of the present invention;

[0032] Figure 3 It is a schematic diagram of the vertical layout of the fully mechanized mining working face of the present invention;

[0033] Figure 4 It is a schematic diagram of the plane layout of the fully mechanized mining working face of the present invention.

[0034] Figure numerals: hydraulic support 1, ejection dust removal device 2, dust collecting hood 21, automatic pressure regulating valve 22, water inlet 23, water vapor ejector 24, mounting seat 25, air duct 26, nozzle 27, air guide tube 28, coal mining machine 3, positioner 4, dust removal control box 5, main control box 6. DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0036] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0037] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] See also Figure 1 to Figure 4, which is a dust control device for pedestrian areas of a fully mechanized mining working face, comprising a coal mining machine 3, a main control box 6, a hydraulic support 1, an ejection dust removal device 2 arranged in the top area of ​​the hydraulic support 1, and a dust removal control box 5 arranged on the connecting rod of the hydraulic support 1; the ejection dust removal device 2 is used to generate negative pressure to suck the dust-containing airflow in the pedestrian area below the hydraulic support 1 and purify it, and it comprises a dust collecting hood 21, an air duct 26, a water inlet 23, an automatic pressure regulating valve 22, a water vapor ejector 24, a nozzle 27, an air guide tube 28 and a mounting seat 25; the mounting seat 25 hangs the ejection dust removal device 2 on the top beam of the hydraulic support 1, the dust collecting hood 21 is arranged below the hydraulic support 1, and is used to collect dust in the pedestrian area. After the pressure water is adjusted to the required pressure from the water inlet 23 through the automatic pressure regulating valve 22, it is sprayed into the water vapor ejector 24 through the nozzle 27, and the water vapor ejector A strong negative pressure is generated in 24, and the dust-containing airflow is sucked through the dust collecting hood 21 and the air duct 26, and is mixed with the spray and then ejected from the air guide tube 28; the dust removal control box 5 is used to receive the working signals of the hydraulic support 1 and the coal mining machine 3, and control the induced dust removal device 2; the dust removal control box 5 is electrically connected to the main control box 6 and the automatic pressure regulating valve 22, and can receive the signal of the positioner 4; a positioner 4 is also provided on the downwind side of the coal mining machine 3 for identifying the working position of the coal mining machine 3 in the tunnel, the dust collecting hood 21 is arranged in one or more distributed forms, the front end is circular or rectangular, and the inlet is directly facing the dust-containing airflow below the hydraulic support 1, the air outlet direction of the air guide tube 28 points to the lower right on the working face facade, and to the upper right on the working face plane, the induced dust removal device 2 and the dust removal control box 5 are arranged at intervals on the hydraulic support 1 of the comprehensive mining working face, and it is appropriate to configure one set for every 2-3 supports.

[0039] A method for controlling dust in pedestrian areas of a fully mechanized mining face, using a device for controlling dust in pedestrian areas of a fully mechanized mining face as described above, comprises the following steps:

[0040] S1, install and arrange all components, and set three working modes of the ejection dust removal device 2: high pressure mode, low pressure mode and standby mode, and realize linkage control through the dust removal control box 5, the main control box 6 and the automatic pressure regulating valve 22;

[0041] S2, Governance Process:

[0042] S21, high pressure mode;

[0043] When the coal mining machine 3 cuts coal and moves to the set distance range of the downwind induced dust removal device 2, the positioner 4 sends a signal to the dust removal control box 5; after receiving the signal, the dust removal control box 5 starts the induced dust removal device 2 and sets the automatic pressure regulating valve 22 to high pressure (≥8MPa); at this time, pressurized water is sprayed into the water vapor ejector 24 through the nozzle 27, generating a strong negative pressure, sucking the dust-laden airflow in the pedestrian area below the hydraulic support 1, and spraying it out from the air guide 28 after mixing with the spray, forming a large-scale fog field covering the coal body collapse, the spalling impacting the roadway floor and the scraper conveyor area, capturing dust and moistening the coal dust, and at the same time using the entrainment effect generated by the spray to guide the dust-laden airflow to migrate along the roadway wind direction, reducing the lateral diffusion of dust;

[0044] S22, low pressure mode;

[0045] When the coal mining machine 3 is not within the set distance range and the hydraulic support 1 is lowering the column and moving the frame, the main control box 6 sends a frame moving signal to the dust removal control box 5; after receiving the signal, the dust removal control box 5 sets the automatic pressure regulating valve 22 to a low pressure (<8MPa), and the induced dust removal device 2 works in a low-pressure spray mode; at this time, the negative pressure generated by the device sucks the dust-laden airflow in the pedestrian area, and after mixing with the spray, it is sprayed out from the air guide 28, covering the scraper conveyor area, wetting and settling the dust, and effectively controlling the dust generated when the column is lowered and the frame is moved;

[0046] S23, standby mode;

[0047] When the coal mining machine 3 is not within the set distance range and the hydraulic support 1 is not lowering the column and moving the frame, the ejection dust removal device 2 is in a standby state, does not consume water resources, and avoids causing the working surface to be slippery and muddy;

[0048] S3, cyclic operation;

[0049] As the coal mining machine 3 cuts coal and the hydraulic support 1 continuously lowers its columns and moves its frames, the dust removal control box 5 controls the ejection dust removal device 2 within the set distance range or at the column lowering and frame moving position to switch to the corresponding working mode in sequence according to the received signal, thereby achieving continuous and efficient dust control within the entire pedestrian area of ​​the comprehensive mining working face.

[0050] Through the device and method of this embodiment, the dust concentration in the pedestrian area of ​​the fully mechanized mining face can be effectively reduced, the working environment can be improved, and the harm of dust to the workers can be reduced. At the same time, the device has a compact structure, small equipment size, no noise pollution, and does not affect the normal operation of the fully mechanized mining face. In addition, high-pressure mode and low-pressure mode are respectively used for dust generated by coal cutting and dust generated by lowering the column and moving the frame of the hydraulic support 1. Under the premise of effectively reducing the dust concentration, the water consumption of the spray is minimized, further improving the practicality and economy of the device.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A dust control device for pedestrian areas of a fully mechanized mining face, characterized in that: It includes a coal mining machine, a main control box, a hydraulic support, an ejection dust removal device arranged in the top area of ​​the hydraulic support, and a dust removal control box arranged on the connecting rod of the hydraulic support; The ejection dust removal device is used to generate negative pressure to suck the dust-containing airflow in the pedestrian area below the hydraulic support and purify it. It includes a dust collecting hood, an air duct, a water inlet, an automatic pressure regulating valve, a water vapor ejector, a nozzle, an air guide tube and a mounting base; the mounting base hangs the ejection dust removal device on the top beam of the hydraulic support, and the dust collecting hood is set under the hydraulic support to collect dust in the pedestrian area. After the pressure water is adjusted to the required pressure from the water inlet through the automatic pressure regulating valve, it is sprayed into the water vapor ejector through the nozzle, and a strong negative pressure is generated in the water vapor ejector. The dust-containing airflow is sucked through the dust collecting hood and the air duct, and is mixed with the spray and then ejected from the air guide tube; The dust removal control box is used to receive the working signals of the hydraulic support and the coal mining machine, and control the ejection dust removal device; the dust removal control box is electrically connected to the main control box and the automatic pressure regulating valve, and can receive the signal of the positioner; A locator is also provided on the downwind side of the coal mining machine to identify the working position of the coal mining machine in the tunnel.

2. A dust control device for pedestrian areas of a fully mechanized mining face according to claim 1, characterized in that: The dust collecting hood is arranged in one or more distributed forms, with a circular or rectangular front end and an inlet facing the dust-laden airflow below the hydraulic support.

3. The dust control device for pedestrian areas of a fully mechanized mining face according to claim 1 is characterized in that: The air outlet direction of the air duct points to the lower right on the working surface elevation and to the upper right on the working surface plane.

4. The dust control device for pedestrian areas of a fully mechanized mining face according to claim 1 is characterized in that: The induced dust removal device and the dust removal control box are arranged at intervals on the hydraulic support of the comprehensive mining working face, and it is advisable to configure one set for every 2-3 supports.

5. A method for controlling dust in pedestrian areas of a fully mechanized mining face, using a device for controlling dust in pedestrian areas of a fully mechanized mining face as described in any one of claims 1 to 4, characterized in that: The following steps are involved: S1, install and arrange all components, and set three working modes of the ejector dust removal device: high pressure mode, low pressure mode and standby mode, and realize linkage control through the dust removal control box, the main control box and the automatic pressure regulating valve; S2, Governance Process: S21, high pressure mode; When the coal mining machine cuts coal and moves to the set distance range of the leeward side ejector dust removal device, the positioner sends a signal to the dust removal control box; after receiving the signal, the dust removal control box starts the ejector dust removal device and sets the automatic pressure regulating valve to high pressure; at this time, pressurized water is sprayed into the water vapor ejector through the nozzle, generating a strong negative pressure, sucking the dust-laden airflow in the pedestrian area below the hydraulic support, and mixing it with the spray and then spraying it out from the air guide tube, forming a large-scale fog field covering the coal body collapse, the spalling impacting the tunnel floor and the scraper conveyor area, capturing dust and moistening the coal dust, and at the same time using the suction effect generated by the spray to guide the dust-laden airflow to migrate along the tunnel wind direction, reducing the lateral diffusion of dust; S22, low pressure mode; When the coal mining machine is not within the set distance range and the hydraulic support is lowering the column and moving the frame, the main control box sends a frame moving signal to the dust removal control box; after receiving the signal, the dust removal control box sets the automatic pressure regulating valve to low pressure, and the induced dust removal device works in low-pressure spray mode; at this time, the negative pressure generated by the device sucks the dust-laden airflow in the pedestrian area, and after mixing with the spray, it is sprayed out from the air guide tube, covering the scraper conveyor area, wetting and settling the dust, and effectively controlling the dust generated when the column is lowered and the frame is moved; S23, standby mode; When the coal mining machine is not within the set distance range and the hydraulic support is not lowering the column and moving the frame, the ejector dust removal device is in standby mode, which does not consume water resources and avoids making the working surface slippery and muddy; S3, cyclic operation; As the coal mining machine cuts coal and the hydraulic support continuously lowers and moves its columns, the dust removal control box controls the ejection dust removal devices within the set distance range or at the column lowering and frame moving positions to switch to corresponding working modes in sequence according to the received signals, thereby achieving continuous and efficient dust control in the entire pedestrian area of ​​the comprehensive mining working face.

6. A method for controlling dust in pedestrian areas of a fully mechanized mining face according to claim 5, characterized in that: The high pressure is ≥8MPa and the low pressure is <8MPa.

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