Filtering dust removal device and coal mining equipment

Abstract

The application provides a filtering and dust removing device and coal mining equipment. The filtering and dust removing device comprises a connecting arm, one end of the connecting arm is rotatably connected with a coal mining machine, and the connecting arm has an air inlet flow channel; a protection structure is fixedly connected with the connecting arm, a cavity in the protection structure is communicated with the air inlet flow channel; a negative pressure structure is arranged in the cavity of the protection structure, and the negative pressure structure is used for providing negative pressure to enable the air inlet flow channel to suck dust-containing air flow near a drum of the coal mining machine; a filtering structure is used for filtering the dust-containing air flow in the protection structure; and a driving structure is rotatably connected with one end of the connecting arm and connected with the coal mining machine at the other end, and the driving structure is used for driving the connecting arm to swing. The air inlet flow channel is arranged on the connecting arm, the negative pressure structure provides negative pressure, so that the air inlet flow channel can suck the dust-containing air flow near the coal mining machine. The connecting arm is rotatably connected with the coal mining machine, so that the dust removing effect of the filtering and dust removing device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine dust removal, and in particular to a filtering dust removal device and coal mining equipment. Background Art

[0002] The dust produced by the shearer drum when cutting coal is composed of finer solid coal particles produced when the shearer drum cuts and crushes the coal in the fully mechanized mining face. During the shearer's drum's rotation and throwing action, and the process of the crushed coal falling from a height, the finer coal particles undergo irregular movement. Affected by the windflow at the working face and the windflow field around the shearer body, the finer coal particles mix with the windflow to form a dusty airflow. The dusty airflow diffuses over a long distance and covers a wide area. It moves with the shearer and lasts for a long time. The dust accumulates during the movement, resulting in high dust concentrations in the area where workers work on the fully mechanized mining face, posing a serious threat to their occupational health. At the same time, high dust concentrations reduce visibility on the working face, and the noisy working environment jeopardizes operational safety.

[0003] With the deepening of research into dust control technologies for shearer drum cutters, dust collectors have been incorporated into the research. Their use in coal mining faces is limited, primarily due to the limited working space and operational processes. The limited working space and constant movement of shearers within these faces make dust collectors ineffective in removing the dust-laden airflow generated by these shearers. Therefore, optimization of existing dust removal methods is necessary. Summary of the Invention

[0004] The present invention provides a filtering dust removal device and coal mining equipment to solve the problem that the dust removal device in the prior art has poor dust removal effect on the dust-laden airflow generated by the coal mining machine.

[0005] In order to solve the above problems, according to one aspect of the present invention, the present invention provides a filtering and dust removal device, including: a connecting arm, one end of the connecting arm is rotatably connected to the coal mining machine, and the connecting arm has an inlet air flow duct; a protective structure, the protective structure is fixedly connected to the connecting arm, and the cavity in the protective structure is connected to the inlet air flow duct; a negative pressure structure, the negative pressure structure is arranged in the cavity of the protective structure, and the negative pressure structure is used to provide negative pressure so that the inlet air flow duct sucks in the dust-laden airflow near the drum of the coal mining machine; a filtering structure, the filtering structure is arranged in the protective structure, and the filtering structure filters the dust-laden airflow in the protective structure; a driving structure, one end of the driving structure is rotatably connected to the connecting arm, and the other end of the driving structure is connected to the coal mining machine, and the driving structure is used to drive the connecting arm to swing.

[0006] Further, the connecting arm further comprises a plurality of nozzles and a plurality of first filter screens, the nozzles and the first filter screens are arranged in the air inlet channel, the nozzles spray liquid to the dust-containing air flow in the air inlet channel, and the first filter screens filter the dust-containing air flow in the air inlet channel, and the plurality of first filter screens have different filtering accuracies.

[0007] Further, the filter dust removal device further comprises a dehydration structure arranged in the protection structure, the dehydration structure dehydrates and removes dirt from the dust-containing air flow filtered by the filter structure.

[0008] Further, the protection structure comprises a protection cover and an air inlet fence, a plurality of communication holes are formed at one end of the protection cover, the plurality of communication holes are communicated with the air inlet channel, and the air inlet fence is fixedly arranged at the one end of the protection cover having the communication holes, and the air inlet fence is used to filter out large particle coal bodies in the dust-containing air flow.

[0009] Further, the air inlet fence comprises a plurality of circular barriers with different radii, and the plurality of circular barriers are concentrically arranged, the circular barrier comprises a plurality of stop pieces, the stop piece is an arc-shaped sheet, and the stop pieces are arranged at intervals in the circumferential direction of the circular barrier.

[0010] Further, in the circumferential direction of the protection cover, the stop pieces in one circular barrier and the stop pieces in the adjacent circular barrier are arranged alternately.

[0011] Further, in the circumferential direction of the protection cover, the protection cover comprises a cylinder, an annular plate and an end plate, the end plate blocks one end of the cylinder, the annular plate is fixed on the inner wall of the cylinder, the annular plate and the end plate have an air inlet cavity therebetween, the communication holes are communicated with the air inlet cavity; the air inlet fence is located in the air inlet cavity, and the air inlet fence and the annular plate are fixedly connected, and the negative pressure structure is located on the side of the annular plate away from the air inlet fence.

[0012] Further, the filter dust removal device further comprises a plurality of air outlet baffles, the air outlet baffles are arranged at one end of the protection structure outputting air, and the air outlet baffles guide the air output from the protection structure.

[0013] Further, the spacing and the included angle between any two adjacent air outlet baffles can be adjusted, so as to adjust the direction of the air output from the protection structure.

[0014] Further, the filter structure comprises a plurality of second filter screens, and the plurality of second filter screens have different filtering accuracies.

[0015] Further, the negative pressure structure comprises an impeller and a soundproof shell, the impeller is rotatably arranged in the soundproof shell, the impeller is used to provide negative pressure, and the soundproof shell is used to eliminate noise generated by rotation of the impeller.

[0016] According to another aspect of the present invention, a coal mining device is provided, comprising a coal mining machine and the above-mentioned filtering and dust removal device, wherein the filtering and dust removal device is installed on the coal mining machine and is used to remove dust generated by the operation of the coal mining machine.

[0017] The technical solution of the present invention provides a filtering and dust removal device, comprising: a connecting arm, one end of which is rotatably connected to a coal shearer and having an inlet airflow passage; a protective structure, fixedly connected to the connecting arm, a cavity within the protective structure communicating with the inlet airflow passage; a negative pressure structure, disposed within the cavity of the protective structure and configured to provide negative pressure, thereby causing the inlet airflow passage to draw in dust-laden airflow near the drum of the coal shearer; a filtering structure, disposed within the protective structure and configured to filter the dust-laden airflow within the protective structure; and a driving structure, one end of which is rotatably connected to the connecting arm and the other end of which is connected to the coal shearer, configured to drive the connecting arm to swing. With this solution, the connecting arm is rotatably connected to the coal shearer, allowing the filtering and dust removal device to move with the movement of the coal shearer. The inlet airflow passage is disposed on the connecting arm, and the negative pressure structure provides negative pressure, thereby allowing the inlet airflow passage to draw in dust-laden airflow near the coal shearer. The protective structure is fixedly connected to the connecting arm, and the dust-laden airflow enters the cavity of the protective structure from the inlet airflow passage. The filter structure filters the dust-laden airflow within the protective structure, removing larger dust particles. The drive structure is used to drive the connecting arm to swing, allowing the connecting arm to swing and absorb dust-laden airflow over a wider range, thereby improving the dust removal effect on the dust-laden airflow generated by the coal mining machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A schematic structural diagram of a filtering and dust removal device provided by an embodiment of the present invention is shown;

[0020] Figure 2 A schematic structural diagram of a coal mining device provided by an embodiment of the present invention is shown;

[0021] Figure 3 Shown Figure 1 A side view of the filtering and dust removal device in FIG.

[0022] Figure 4 Shown Figure 3 Cross-sectional view at AA in the middle;

[0023] Figure 5 Shown Figure 1 Schematic diagram of the structure of the middle connecting arm;

[0024] Figure 6 Shown Figure 1 Structural diagram of the dehydration structure in;

[0025] Figure 7 Shown Figure 1 Schematic diagram of the negative pressure structure in .

[0026] The above drawings include the following reference numerals:

[0027] 10. Connecting arm; 11. Inlet air duct; 12. First air inlet; 13. Second air inlet; 14. Coal mining machine connection hole; 15. Drive connection hole;

[0028] 20. Protective structure; 21. Protective cover; 211. Annular plate; 22. Air intake grille; 221. Round enclosure; 2211. Stopper;

[0029] 30. Negative pressure structure; 31. Impeller; 32. Muffler shell;

[0030] 40. Filter structure;

[0031] 50. Drive structure;

[0032] 60. Dehydration structure;

[0033] 71. Air outlet baffle. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 7As shown, an embodiment of the present invention provides a filtering and dust removal device, including: a connecting arm 10, one end of the connecting arm 10 is rotatably connected to the coal mining machine, and the connecting arm 10 has an inlet air duct 11; a protective structure 20, the protective structure 20 is fixedly connected to the connecting arm 10, and the cavity in the protective structure 20 is connected to the inlet air duct 11; a negative pressure structure 30, the negative pressure structure 30 is arranged in the cavity of the protective structure 20, and the negative pressure structure 30 is used to provide negative pressure so that the inlet air duct 11 sucks in the dust-laden airflow near the drum of the coal mining machine; a filtering structure 40, the filtering structure 40 is arranged in the protective structure 20, and the filtering structure 40 filters the dust-laden airflow in the protective structure 20; a driving structure 50, one end of the driving structure 50 is rotatably connected to the connecting arm 10, and the other end of the driving structure 50 is connected to the coal mining machine, and the driving structure 50 is used to drive the connecting arm 10 to swing.

[0036] With this solution, the connecting arm 10 is rotatably connected to the coal mining machine, so that the filtering and dust removal device can move with the movement of the coal mining machine. The air inlet duct 11 is provided on the connecting arm 10, and the negative pressure structure 30 provides negative pressure so that the air inlet duct 11 can suck in the dust-laden airflow near the coal mining machine. The protective structure 20 is fixedly connected to the connecting arm 10, and the dust-laden airflow enters the cavity of the protective structure 20 from the air inlet duct 11. The filtering structure 40 filters the dust-laden airflow in the protective structure 20 and filters out larger particles of dust. The driving structure 50 is used to drive the connecting arm 10 to swing, so that the connecting arm 10 can swing to absorb dust-laden airflow in a larger range, thereby improving the dust removal effect on the dust-laden airflow generated by the coal mining machine.

[0037] like Figure 5 As shown, a first air inlet 12 is provided on the side of the connecting arm 10, and a second air inlet 13 is provided on the bottom surface of the connecting arm 10. The first air inlet 12 and the second air inlet 13 are both connected to the inlet air duct 11, and the dust-laden airflow enters the inlet air duct 11 from the first air inlet 12 and the second air inlet 13. The water supply and power supply lines of the filtering dust removal device are distributed on the connecting arm 10, providing electricity and water for the filtering dust removal device. A coal mining machine connection hole 14 and a drive connection hole 15 are provided on the connecting arm 10. The filtering dust removal device is rotatably connected to the coal mining machine through the coal mining machine connection hole 14, and the drive structure 50 is connected to the connecting arm 10 through the drive connection hole 15. In a specific embodiment, the drive structure is a hydraulic system, and the hydraulic system drives the rotation of the connecting arm.

[0038] Among them, the connecting arm 10 also includes multiple nozzles and multiple first filters. The nozzles and the first filters are arranged in the inlet air duct 11. The nozzles spray liquid on the dust-laden airflow in the inlet air duct 11, and the first filters filter the dust-laden airflow in the inlet air duct 11. The filtering accuracy of the multiple first filters is different.

[0039] With this configuration, the nozzle sprays liquid onto the dust-laden airflow within the inlet duct 11 to absorb the dust. The first filter screen filters the dust-laden airflow entering the inlet duct 11, removing large dust particles from the dust-laden airflow. Through multiple first filters of varying precision, the large dust particles are effectively removed.

[0040] like Figure 6 As shown, the filtration and dust removal device also includes a dehydration structure 60, disposed within the protective structure 20. This dehydration structure 60 dehydrates and removes contaminants from the dust-laden airflow after filtration by the filtration structure 40. This arrangement removes water that enters the dust-laden airflow when it is sprayed with liquid, thereby minimizing the water content in the airflow output by the filtration and dust removal device. In one specific embodiment, the dehydration structure 60 utilizes a corrugated plate structure. The S-shaped, multi-channel nature of the corrugated plate increases the contact area between the dust-laden airflow and the plate, allowing the plate to fully absorb water and dust from the dust-laden airflow.

[0041] like Figure 3 and Figure 4 As shown, the protective structure 20 includes a protective cover 21 and an air intake grille 22. One end of the protective cover 21 defines multiple communication holes, which communicate with the intake duct 11. The air intake grille 22 is fixedly mounted within the protective cover 21 at the end with the communication holes. The air intake grille 22 is used to filter out large coal particles from the dust-laden airflow. This arrangement allows the dust-laden airflow to enter the protective cover 21 from the intake duct 11 through the communication holes. The air intake grille 22 filters the dust-laden airflow entering the protective cover 21, removing large coal particles from the dust-laden airflow.

[0042] like Figure 4 As shown, the air intake grille 22 comprises a plurality of concentrically arranged circular enclosures 221 of varying radii. Each of these enclosures 221 includes a plurality of stoppers 2211, each of which is a thin arc-shaped plate and spaced circumferentially around the enclosure 221. This arrangement of the multiple concentrically arranged circular enclosures 221 enables multi-layer filtration of the dust-laden airflow entering the protective hood 21. The stoppers 2211 are spaced circumferentially around the enclosure 221, with the spacing between the stoppers 2211 allowing the dust-laden airflow to pass while blocking out large dust particles.

[0043] like Figure 4 As shown, the stoppers 2211 in one circular enclosure 221 are alternately arranged with the stoppers 2211 in the adjacent circular enclosure 221 in the circumference of the protective cover 21. This arrangement increases the passage path of the dust-laden airflow, reduces the possibility of large dust particles entering the negative pressure structure 30, and prevents large dust particles from damaging the components of the negative pressure structure 30.

[0044] like Figure 4As shown, in the circumferential direction of the protective cover 21, the protective cover 21 includes a cylinder, an annular plate 211 and an end plate. The end plate blocks one end of the cylinder. The annular plate 211 is fixed on the inner wall of the cylinder. There is an air intake cavity between the annular plate 211 and the end plate, and the connecting hole is connected to the air intake cavity; the air intake fence 22 is located in the air intake cavity, and the air intake fence 22 and the annular plate 211 are fixedly connected, and the negative pressure structure 30 is located on the side of the annular plate 211 away from the air intake fence 22.

[0045] The cylinder and connecting arm 10 are fixedly connected, and the end plate blocks the end of the cylinder with the connecting hole, preventing the dust-laden airflow drawn into the protective hood 21 from leaking out. An air inlet cavity is defined between the annular plate 211 and the end plate. Dust-laden airflow enters the cavity through the inlet duct 11. An aperture is defined in the center of the annular plate 211. Once the dust-laden airflow enters the cavity, it exits through the aperture and enters the negative pressure structure 30.

[0046] like Figure 1 As shown, the filtering and dust removal device also includes multiple air outlet baffles 71, which are positioned at one end of the protective structure 20 where gas is output. The air outlet baffles 71 guide the gas output from the protective structure 20. This arrangement directs the gas output from the protective structure 20, thereby adjusting the direction of the output airflow. In one specific embodiment, a cross-mounted bracket is mounted at one end of the protective structure 20 where gas is output, and the air outlet baffles 71 are mounted on the cross-mounted bracket.

[0047] The spacing and angle between any two adjacent air baffles 71 are adjustable to adjust the direction of the gas output from the protective structure 20. This arrangement allows the angle of the air baffles 71 to be adjusted according to the air flow conditions at the shearer work site to protect the environment.

[0048] like Figure 1 As shown, the filter structure 40 includes multiple second filter screens with different filtering accuracies. In this way, the multiple second filter screens with different filtering accuracies filter the dust-laden airflow input into the filter structure 40 step by step, and fully filter the dust in the dust-laden airflow.

[0049] like Figure 7 As shown, the negative pressure structure 30 includes an impeller 31 and a muffler housing 32. The impeller 31 is rotatably disposed within the muffler housing 32. The impeller 31 is used to provide negative pressure, and the muffler housing 32 is used to eliminate noise generated by the rotation of the impeller 31. In this arrangement, the negative pressure provided by the impeller 31 causes the dust-laden airflow to be drawn into the protective structure 20 through the inlet airflow channel 11. The muffler housing 32 eliminates the noise generated by the rotation of the impeller 31, thereby preventing noise from being generated at the coal mining machine working site.

[0050] According to another aspect of the present application, there is provided a coal mining equipment comprising a coal mining machine and the above-mentioned filter dust removal device, the filter dust removal device being installed on the coal mining machine and being used for removing dust generated by the operation of the coal mining machine. The filter dust removal device moves along with the movement of the coal mining machine and filters the dust-containing air flow generated by the operation of the coal mining machine.

[0051] The preferred embodiments of the present application are described above with the purpose of only illustrating the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprise" and / or "include" when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof.

[0053] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. The techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description where appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0054] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

Claims

1. A filtering dust removal device, characterized in that: include: A connecting arm (10), one end of which is rotatably connected to the coal mining machine, and the connecting arm (10) has an air inlet passage (11); a protective structure (20), the protective structure (20) being fixedly connected to the connecting arm (10), the cavity within the protective structure (20) being in communication with the inlet flow channel (11); A negative pressure structure (30), the negative pressure structure (30) being arranged in the cavity of the protective structure (20), the negative pressure structure (30) being used to provide negative pressure so that the air inlet duct (11) draws in dust-laden airflow near the drum of the coal mining machine; a filtering structure (40), the filtering structure (40) being arranged in the protective structure (20), and the filtering structure (40) filtering the dust-laden airflow in the protective structure (20); A driving structure (50), one end of the driving structure (50) is rotatably connected to the connecting arm (10), the other end of the driving structure (50) is connected to the coal mining machine, and the driving structure (50) is used to drive the connecting arm (10) to swing; The protective structure (20) includes a protective cover (21) and an air intake fence (22). A plurality of communication holes are provided at one end of the protective cover (21), and the plurality of communication holes are connected to the air intake passage (11). The air intake fence (22) is fixedly arranged at one end of the protective cover (21) having the communication holes. The air intake fence (22) is used to filter out large particles of coal in the dust-laden airflow. The air intake fence (22) comprises a plurality of circular enclosures (221) of different radii, the plurality of circular enclosures (221) being concentrically arranged, the circular enclosure (221) comprising a plurality of stopper plates (2211), the stopper plates (2211) being arc-shaped thin plates, and the stopper plates (2211) being circumferentially spaced apart on the circular enclosure (221); In the circumferential direction of the protective cover (21), the stopper piece (2211) in one circular enclosure (221) and the stopper piece (2211) in an adjacent circular enclosure (221) are arranged alternately.

2. The dust filtering device according to claim 1, characterized in that: The connecting arm (10) further comprises a plurality of nozzles and a plurality of first filter screens, wherein the nozzles and the first filter screens are arranged in the inlet air duct (11), the nozzles spray liquid on the dust-laden airflow in the inlet air duct (11), and the first filter screens filter the dust-laden airflow in the inlet air duct (11), and the filtering precisions of the plurality of first filter screens are different.

3. The filtering and dust removal device according to claim 1, characterized in that: The filtering and dust removal device further comprises a dehydration structure (60), wherein the dehydration structure (60) is arranged in the protective structure (20), and the dehydration structure (60) dehydrates and removes dust from the airflow after being filtered by the filtering structure (40).

4. The filtering and dust removal device according to claim 1, characterized in that: In the circumferential direction of the protective cover (21), the protective cover (21) includes a cylinder, an annular plate (211) and an end plate, the end plate blocks one end of the cylinder, the annular plate (211) is fixed to the inner wall of the cylinder, an air intake cavity is provided between the annular plate (211) and the end plate, and the communicating hole is communicated with the air intake cavity; the air intake fence (22) is located in the air intake cavity, and the air intake fence (22) and the annular plate (211) are fixedly connected, and the negative pressure structure (30) is located on the side of the annular plate (211) facing away from the air intake fence (22).

5. The filtering and dust removal device according to claim 1, characterized in that: The filtering and dust removal device further comprises an air outlet baffle (71), wherein the air outlet baffle (71) is multiple and is arranged at one end of the protective structure (20) where the gas is output, and the air outlet baffle (71) guides the gas output from the protective structure (20).

6. The filtering and dust removal device according to claim 5, characterized in that: The spacing and angle between any two adjacent air outlet baffles (71) are adjustable, and are used to adjust the direction of the gas output by the protective structure (20).

7. The filtering and dust removal device according to claim 1, characterized in that: The filtering structure (40) comprises a plurality of second filter screens, and the filtering precisions of the plurality of second filter screens are different.

8. The filtering and dust removal device according to claim 1, characterized in that: The negative pressure structure (30) comprises an impeller (31) and a muffler housing (32); the impeller (31) is rotatably disposed in the muffler housing (32); the impeller (31) is used to provide negative pressure; and the muffler housing (32) is used to eliminate noise generated by the rotation of the impeller (31).

9. A coal mining equipment, characterized in that: It comprises a coal mining machine and a filtering dust removal device according to any one of claims 1 to 8, wherein the filtering dust removal device is installed on the coal mining machine and is used to remove dust generated by the operation of the coal mining machine.

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