A multi-stage inertial separation dust collection device and method

Abstract

The present invention belongs to the technical field of dust control, and discloses a multi-stage inertial separation dust collection device and method, including a closed dust collection hood. The lower end of the closed dust collection hood is fixedly connected with a multi-stage inertial drainage dust collection pipeline, and the end of the multi-stage inertial drainage dust collection pipeline is fixedly connected with a negative pressure fan; the multi-stage inertial drainage dust collection pipeline includes a drainage pipeline fixedly connected with the lower end of the closed dust collection hood. A large-size particle collection box is arranged at the inflection point of the vertical direction and the horizontal direction of the drainage pipeline. The horizontal drainage pipeline is also distributed with semi-section dust filter membrane clips. The end of the drainage pipeline is fixedly connected with a residual dust collection cavity, and a residual dust collection drawer is arranged in the residual dust collection cavity. The present invention solves the problem of separating and sampling dust with different particle sizes during the cutting process of coal rock mass in laboratory research, and realizes the centralized collection of dust with different particle sizes while purifying the dust-containing air flow.

Description

Technical Field

[0001] The present invention belongs to the technical field of dust control, and particularly relates to a multi-stage inertial separation dust collection device and method. Background Technique

[0002] The dust generated by the mechanical cutting of coal and rock masses is the main source of dust in the mine production process and is an essential research content in the process of dust control. However, limited by the mine production conditions and safety regulations, most of the research in this area is carried out on similar laboratory platforms.

[0003] The current cutting dust generation experimental platform rarely considers dust collection and analysis. Most of them are simple natural sedimentation collection or centralized negative pressure extraction. The experimental waiting period is long, and it is not easy to obtain the separation and sampling of dust with different particle sizes, which is not conducive to the later targeted physical and chemical property analysis of dust particles with different particle sizes. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a multi-stage inertial separation dust collection device and method, which solves the problems of separating and sampling dust with different particle sizes in the existing cutting dust generation experimental platform and the later targeted physical and chemical property analysis of dust particles with different particle sizes.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A multi-stage inertial separation dust collection device includes an enclosed dust collection hood. The lower end of the enclosed dust collection hood is fixedly connected with a multi-stage inertial drainage dust collection pipeline, and the end of the multi-stage inertial drainage dust collection pipeline is fixedly connected with a negative pressure fan.

[0007] The multi-stage inertial drainage dust collection pipeline includes a drainage pipeline fixedly connected to the lower end of the enclosed dust collection hood. A large particle collection box is arranged at the inflection point of the vertical and horizontal directions of the drainage pipeline. The horizontal drainage pipeline is also distributed with semi-section dust filter membrane clips. The end of the drainage pipeline is fixedly connected with a residual dust collection cavity, and a residual dust collection drawer is arranged in the residual dust collection cavity.

[0008] Further, the enclosed dust collection hood is composed of a dust collection hood outer shell, a flexible dust isolation curtain, a cutting follow-up module, and a dust falling funnel. A cutting hole is opened on the dust collection hood outer shell, and the cutting follow-up module is fixedly connected to the outer periphery of the cutting hole. The flexible dust isolation curtain is connected to the cutting follow-up module, and the lower end of the dust collection hood outer shell is fixedly connected with the dust falling funnel.

[0009] Further, the cutting follow-up module is composed of a slide rail seat, a follow-up block, a slide rail limit block, and a slide rail block; the two longitudinally parallel slide rail seats are fixedly connected to both sides of the cutting hole on the outer shell of the dust collection hood, the two ends of the two transversely parallel slide rail seats are fixed with the slide rail limit blocks, the slide rail limit blocks are slidably connected to the two longitudinally parallel slide rail seats, the slide rail block is fixedly connected to the periphery of the follow-up block, and the slide rail block is slidably connected to the two transversely parallel slide rail seats.

[0010] Further, four flexible dust isolation curtains are provided, which are respectively arranged around the follow-up block. Circular mounting holes are designed on both sides of the bottom of the flexible dust isolation curtain, and the circular mounting holes are mounted on the slide rail seat of the cutting follow-up module and are connected to the slide rail block.

[0011] Further, the flexible dust isolation curtain is made of PVC-coated fiberglass material and is in the shape of an accordion fold.

[0012] Further, the large-size particle collection box is horizontally inserted and installed at the bottom corner of the vertical pipe of the drainage pipe. The large-size particle collection box is designed with an arc-shaped guide plate, a moving handle, a dust collection plate, and a dust-blocking guide plate; the arc-shaped guide plate and the dust-blocking guide plate are arranged at both ends of the dust collection plate, and the moving handle is arranged on one side of the arc-shaped guide plate.

[0013] Further, the semi-section dust filter membrane clip is horizontally inserted and installed in the slots on both sides of the horizontal pipe of the drainage pipe. The semi-section dust filter membrane clip is composed of a clamp, a filter membrane pressing plate, and a filter membrane mounting plate. The filter membrane is installed in the groove of the filter membrane mounting plate and is pressed by the convex platform of the filter membrane pressing plate. Finally, the clamp is inserted into the fastening groove of the filter membrane pressing plate and the filter membrane mounting plate.

[0014] Further, the residual dust collection cavity is composed of an air outlet, a cavity, and an air inlet; the residual dust collection cavity is connected to the drainage pipe through the air inlet and is connected to the negative pressure fan through the air outlet, and a residual dust collection drawer is arranged in the cavity.

[0015] Further, the residual dust collection drawer includes a sealing plate, a dust-falling collection plate is fixedly connected to the lower end of the sealing plate, a filter membrane fixing plate is fixedly connected to the side of the dust-falling collection plate, rectangular ventilation holes are distributed on the filter membrane fixing plate, the filter membrane fixing plate is inclined and there is a certain angle between the filter membrane fixing plate and the dust-falling collection plate.

[0016] A method for using a multi-stage inertial separation dust collection device includes the following steps:

[0017] First, start the negative pressure fan, which is the power source of the internal flow field of the whole set of multi-stage inertial separation dust collection device;

[0018] Secondly, start the cutting power source to cut the coal and rock mass. The closed dust collection hood serves as the area where the cutting action of the coal and rock mass occurs. The closed cavity restricts the diffusion of dust during the cutting process to the surrounding environment. Both the coal blocks and coal dust generated during the cutting process enter the multi-stage inertial drainage dust collection device through the dust fall funnel;

[0019] Thirdly, the crushed coal blocks and non-floating dust fall on the large-size particle collection box. The arc-shaped deflector guides the dust-containing air flow into the multi-stage inertial dust collection filter membrane array composed of several staggered semi-section dust filter membrane clips. Larger particle size dust particles are difficult to change their movement direction due to inertia and are captured by the first two rows of semi-section dust filter membrane clips. Smaller particle size dust particles will continue to move with the dust-containing air flow and are sequentially captured by the subsequent dust filter membrane clips due to inertia;

[0020] Finally, the residual dust-containing air flow after being processed by the multi-stage inertial dust collection filter membrane array enters the residual dust collection cavity. The filter membrane on the residual dust collection drawer makes the final capture treatment of the residual dust therein, and outputs dust-free air flow to the negative pressure fan.

[0021] Advantages of the present invention:

[0022] The present invention solves the problem of separating and sampling dust with different particle sizes during the cutting process of coal and rock mass in laboratory research, realizes the purification of dust-containing air flow while centrally collecting dust with different particle sizes, and is conducive to carrying out targeted physical and chemical property analysis on coal dust. Description of the drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the multi-stage inertial separation dust collection device according to the embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the cutting dust generation simulation system according to the embodiment of the present invention;

[0026] Figure 3 It is a sectional view of the cutting dust generation simulation system according to the embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the multi-stage inertial drainage dust collection pipeline structure according to the embodiment of the present invention;

[0028] Figure 5 It is the working schematic diagram of the multi-stage inertial dust-catching filter membrane array according to the embodiment of the present invention;

[0029] Figure 6 It is the structural diagram of the large-size particle collection box according to the embodiment of the present invention;

[0030] Figure 7 It is the structural diagram of the semi-section dust filter membrane clip according to the embodiment of the present invention;

[0031] Figure 8 It is the structural diagram of the residual dust collection drawer according to the embodiment of the present invention;

[0032] Figure 9 It is the structural diagram of the residual dust collection cavity according to the embodiment of the present invention;

[0033] Figure 10 It is the schematic diagram of the flexible dust isolation curtain according to the embodiment of the present invention;

[0034] Figure 11 It is the schematic diagram of the cutting follow-up module according to the embodiment of the present invention. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0037] As Figures 1-11 shown, the present invention provides an embodiment, a multi-stage inertial separation dust collection device, including a closed dust collection hood 10, a multi-stage inertial drainage dust-catching pipe 5 is fixedly connected to the lower end of the closed dust collection hood 10, and a negative pressure fan 4 is fixedly connected to the end of the multi-stage inertial drainage dust-catching pipe 5;

[0038] The multi-stage inertial drainage dust collection pipeline 5 includes a drainage pipeline 51 fixedly connected to the lower end of the closed dust collection hood 10. A large-size particle collection box 52 is provided at the inflection point of the vertical and horizontal directions of the drainage pipeline 51. Semi-section dust filter membrane clips 53 are also distributed on the horizontal drainage pipeline 51. The end of the drainage pipeline 51 is fixedly connected to a residual dust collection cavity 55, and a residual dust collection drawer 54 is provided in the residual dust collection cavity 55.

[0039] The negative pressure fan 4 is the power source of the internal flow field of the whole set of multi-stage inertial separation dust collection device; the closed dust collection hood 10, as the occurrence area of the coal rock mass cutting action, restricts the diffusion of dust during the cutting process to the surrounding environment through the closed cavity 101. The coal blocks and coal dust generated during the cutting process both enter the multi-stage inertial drainage dust collection device 5 through the dust funnel 104. The broken coal blocks and non-floating dust fall on the large-size particle collection box 52. The arc-shaped guide plate 521 guides the dust-containing air flow into the multi-stage inertial dust collection filter membrane array composed of several semi-section dust filter membrane clips 53 arranged in an interleaved manner. Larger particle size dust particles are difficult to change their movement direction due to inertia and are captured by the first two rows of semi-section dust filter membrane clips 53. Smaller particle size dust particles will continue to move with the dust-containing air flow and are sequentially captured by the subsequent dust filter membrane clips 53 due to inertia; the residual dust-containing air flow after being processed by the multi-stage inertial dust collection filter membrane array enters the residual dust collection cavity 55, and the filter membrane on the residual dust collection drawer 54 makes the final capture treatment of the residual dust therein, and outputs dust-free air flow to the negative pressure fan 4.

[0040] The present invention solves the problem of separating and sampling dust with different particle sizes during the cutting process of coal rock mass in the laboratory research, realizes the purification of the dust-containing air flow while centrally collecting dust with different particle sizes, and is beneficial to carrying out targeted physical and chemical property analysis on coal dust.

[0041] The closed dust collection hood 10 is composed of a dust collection hood outer shell 101, a flexible dust isolation curtain 102, a cutting follow-up module 103, and a dust funnel 104; a cutting hole is opened on the dust collection hood outer shell 101, and a cutting follow-up module 103 is fixedly connected to the outer periphery of the cutting hole. A flexible dust isolation curtain 102 is connected to the cutting follow-up module 103, and a dust funnel 104 is fixedly connected to the lower end of the dust collection hood outer shell 101. The cutting power source cuts the coal rock mass through the cutting hole on the dust collection hood outer shell 101, and the generated fragments and dust fall into the dust funnel 104 and then fall into the multi-stage inertial drainage dust collection pipeline 5 below through the dust funnel 104.

[0042] The cutting follow-up module 103 is composed of a slide rail base 1031, a follow-up block 1032, a slide rail limit block 1033, and a slide rail block 1034; two longitudinally parallel slide rail bases 1031 are fixedly connected to both sides of the cutting hole on the dust collection hood outer shell 101, and slide rail limit blocks 1033 are fixed at both ends of the two laterally parallel slide rail bases 1031. The slide rail limit blocks 1033 are slidably connected to the two longitudinally parallel slide rail bases 1031. The slide rail block 1034 is fixedly connected to the periphery of the follow-up block 1032, and the slide rail block 1034 is slidably connected to the two laterally parallel slide rail bases 1031. The cutting power source is inserted into the cutting hole on the dust collection hood outer shell 101 through the round hole of the follow-up block 1032. When the cutting power source moves, the follow-up block 103 follows the movement. The cutting follow-up module 103 realizes the four-degree-of-freedom movement of the follow-up block 1032 on the surface of the dust collection hood by two sets of sliding guide rails.

[0043] There are four flexible dust isolation curtains 102, which are respectively arranged around the follow-up block 1032. Circular mounting holes 1021 are designed on both sides of the bottom of the flexible dust isolation curtain 102. The circular mounting holes 1021 are mounted on the slide rail base 1031 of the cutting follow-up module 103 and are connected to the slide rail block 1034, realizing the function of follow-up telescopic dust isolation.

[0044] The flexible dust isolation curtain 102 is made of PVC-coated fiberglass material, is in a bellows-like fold shape, and has the function of expansion and contraction.

[0045] The large-size particle collection box 52 is horizontally inserted and installed at the bottom corner of the vertical pipe of the drainage pipe 51. The large-size particle collection box 52 is designed with an arc-shaped deflector 521, a moving handle 522, a dust collection plate 523, and a dust-blocking deflector 524; the arc-shaped deflector 521 and the dust-blocking deflector 524 are arranged at both ends of the dust collection plate 523, and the moving handle 522 is arranged on one side of the arc-shaped deflector 521. The crushed coal blocks and non-floating dust fall on the large-size particle collection device 52, and the arc-shaped deflector 521 guides the dust-containing air flow into the multi-stage inertial dust-catching filter membrane array composed of a plurality of semi-section dust filter membrane clips 53 arranged in an alternating manner.

[0046] The semi-section dust filter membrane clip 53 is horizontally inserted and installed in the slot on both sides of the horizontal pipe of the drainage pipe 51. The semi-section dust filter membrane clip 53 is composed of a clamp 531, a filter membrane pressing plate 532, and a filter membrane mounting plate 533. The filter membrane is installed in the groove of the filter membrane mounting plate 533 and is pressed by the boss of the filter membrane pressing plate 532. Finally, the clamp 531 is inserted into the fastening groove of the filter membrane pressing plate 532 and the filter membrane mounting plate 533.

[0047] The residual dust collection chamber 55 is composed of an air outlet 551, a cavity 552, and an air inlet 553; the residual dust collection chamber 55 is connected to the drainage pipeline 51 through the air inlet 553 and connected to the negative pressure fan 4 through the air outlet 551. A residual dust collection drawer 54 is provided in the cavity 552. The residual dust collection chamber 55 is used to install the residual dust collection drawer 54 to collect the dust falling from the filter membrane and the residual dust naturally settling in the dust-containing air flow. Larger particle size dust particles are difficult to change their movement direction due to inertia and are trapped by the first two rows of semi-section dust filter membrane clips 53. Smaller particle size dust particles will continue to move with the dust-containing air flow and are sequentially trapped by the subsequent dust filter membrane clips 53 due to inertia.

[0048] The residual dust collection drawer 54 is horizontally inserted into the cavity 552 of the residual dust collection chamber 55 from one side of the residual dust collection chamber 55.

[0049] The residual dust collection drawer 54 includes a sealing plate 542. A dust falling collection plate 544 is fixedly connected to the lower end of the sealing plate 542. A filter membrane fixing plate 543 is fixedly connected to the side of the dust falling collection plate 544. Rectangular ventilation holes 541 are distributed on the filter membrane fixing plate 543. The filter membrane fixing plate 543 is inclined and there is a certain angle between it and the dust falling collection plate 544. The array-distributed rectangular ventilation holes 541 are used to ensure the uniform and unobstructed flow field of the entire multi-stage inertial separation dust collection device. The sealing plate 542 realizes the sealing of the residual dust collection cavity 552 by installing a sealing strip on the sealing step surface. The inclined design of the filter membrane fixing plate 543 increases the ventilation area. The filter membrane is wrapped on the inner surface and edge of the filter membrane fixing plate 543. The dust falling collection plate 544 is used to collect the dust falling from the filter membrane and the residual dust naturally settling in the dust-containing air flow.

[0050] A usage method of a multi-stage inertial separation dust collection device includes the following steps:

[0051] First, start the negative pressure fan 4. The negative pressure fan 4 is the power source of the internal flow field of the entire multi-stage inertial separation dust collection device;

[0052] Second, start the cutting power source to cut the coal and rock mass. The closed dust collection hood 10 is the area where the coal and rock mass cutting action occurs. The closed cavity 101 restricts the diffusion of dust during the cutting process to the surrounding environment. The coal blocks and coal dust generated during the cutting process both enter the multi-stage inertial drainage dust collection device 5 through the dust falling funnel 104;

[0053] Again, the crushed coal pieces and non-floating dust fall on the large-size particle collection box 52. The arc-shaped deflector 521 guides the dust-containing air flow into the multi-stage inertial dust-catching filter membrane array composed of a number of staggered semi-section dust filter membrane clips 53. Dust particles with a larger particle size are difficult to change their movement direction due to inertia and are trapped by the first two rows of semi-section dust filter membrane clips 53. Dust particles with a smaller particle size will continue to move with the dust-containing air flow and are successively trapped by the subsequent dust filter membrane clips 53 due to inertia;

[0054] Finally, the residual dust-containing air flow after being processed by the multi-stage inertial dust-catching filter membrane array enters the residual dust collection chamber 55. The filter membrane on the residual dust collection drawer 54 makes a final collection treatment on the residual dust therein, and outputs dust-free air flow to the negative pressure fan 4.

[0055] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A multi-stage inertial separation dust collection device, including an enclosed dust collection hood (10), characterized in that, The lower end of the closed dust collection hood (10) is fixedly connected with a multi-stage inertial drainage dust collection pipeline (5), and the end of the multi-stage inertial drainage dust collection pipeline (5) is fixedly connected with a negative pressure fan (4); The multi-stage inertial drainage dust collection pipeline (5) includes a drainage pipeline (51) fixedly connected to the lower end of the closed dust collection hood (10). A large-size particle collection box (52) is arranged at the inflection point of the vertical and horizontal directions of the drainage pipeline (51). The horizontal drainage pipeline (51) is also distributed with semi-section dust filter membrane clips (53). The end of the drainage pipeline (51) is fixedly connected with a residual dust collection cavity (55), and a residual dust collection drawer (54) is arranged in the residual dust collection cavity (55); The closed dust collection hood (10) is composed of a dust collection hood outer shell (101), a flexible dust isolation curtain (102), a cutting follow-up module (103), and a dust falling funnel (104); a cutting hole is formed in the dust collection hood outer shell (101), and the cutting follow-up module (103) is fixedly connected to the outer periphery of the cutting hole. A flexible dust isolation curtain (102) is connected to the cutting follow-up module (103), and a dust falling funnel (104) is fixedly connected to the lower end of the dust collection hood outer shell (101); The cutting follow-up module (103) is composed of a slide rail seat (1031), a follow-up block (1032), a slide rail limit block (1033), and a slide rail block (1034); two longitudinally parallel slide rail seats (1031) are fixedly connected to both sides of the cutting hole on the dust collection hood outer shell (101). Slide rail limit blocks (1033) are fixed at both ends of the two transversely parallel slide rail seats (1031). The slide rail limit blocks (1033) are slidably connected to the two longitudinally parallel slide rail seats (1031). The slide rail block (1034) is fixedly connected to the periphery of the follow-up block (1032), and the slide rail block (1034) is slidably connected to the two transversely parallel slide rail seats (1031); Four flexible dust isolation curtains (102) are arranged, respectively arranged around the follow-up block (1032). Circular mounting holes (1021) are designed on both sides of the bottom of the flexible dust isolation curtain (102). The circular mounting holes (1021) are mounted on the slide rail seats (1031) of the cutting follow-up module (103) and are connected to the slide rail blocks (1034).

2. The multi-stage inertial separation dust collection device according to claim 1, characterized in that, The flexible dust isolation curtain (102) is made of PVC-coated fiberglass material and is in the shape of a bellows fold.

3. The multi-stage inertial separation dust collection device according to claim 1, wherein, The large-size particle collection box (52) is horizontally inserted and installed at the bottom corner of the vertical pipeline of the drainage pipeline (51). The large-size particle collection box (52) is designed with an arc-shaped guide plate (521), a moving handle (522), a dust collection plate (523), and a dust blocking guide plate (524); the arc-shaped guide plate (521) and the dust blocking guide plate (524) are arranged at both ends of the dust collection plate (523), and the moving handle (522) is arranged on one side of the arc-shaped guide plate (521).

4. The multi-stage inertial separation dust collection device according to claim 1, characterized in that The semi - broken flour dust filter membrane clip (53) is horizontally inserted and installed in the slots on both sides of the horizontal pipe of the drainage pipe (51). The semi - broken flour dust filter membrane clip (53) consists of a clamp (531), a filter membrane pressing plate (532), and a filter membrane mounting plate (533). The filter membrane is installed in the groove of the filter membrane mounting plate (533) and is pressed by the boss of the filter membrane pressing plate (532). Finally, the clamp (531) is inserted into the fastening groove of the filter membrane pressing plate (532) and the filter membrane mounting plate (533).

5. The multi-stage inertial separation dust collection device according to claim 1, characterized in that, The residual dust collection cavity (55) consists of an air outlet (551), a cavity (552), and an air inlet (553). The residual dust collection cavity (55) is connected to the drainage pipe (51) through the air inlet (553) and is connected to the negative pressure fan (4) through the air outlet (551). The residual dust collection drawer (54) is arranged in the cavity (552).

6. The multi-stage inertial separation dust collection device according to claim 1, wherein, The residual dust collection drawer (54) includes a sealing plate (542). A dust - falling collection plate (544) is fixedly connected to the lower end of the sealing plate (542). A filter membrane fixing plate (543) is fixedly connected to the side of the dust - falling collection plate (544). Rectangular ventilation holes (541) are distributed on the filter membrane fixing plate (543). The filter membrane fixing plate (543) is inclined and has a certain angle with the dust - falling collection plate (544).

7. A method of using a multi-stage inertial separation dust collection device, using the multi-stage inertial separation dust collection device according to any one of claims 1-6, characterized in that, Including the following steps: First, start the negative pressure fan (4). The negative pressure fan (4) is the power source of the internal flow field of the whole set of multi - stage inertial separation dust collection device. Second, start the cutting power source to cut the coal and rock mass. The closed dust collection hood (10) is the area where the cutting action of the coal and rock mass occurs. The closed cavity (101) restricts the diffusion of dust during the cutting process to the surrounding environment. The coal blocks and coal dust generated during the cutting process both enter the multi - stage inertial drainage dust collection device (5) through the dust - falling funnel (104). Third, the crushed coal blocks and non - floating dust fall on the large - size particle collection box (52). The arc - shaped guide plate (521) guides the dust - laden air flow into the multi - stage inertial dust collection filter membrane array composed of several staggered semi - broken flour dust filter membrane clips (53). Larger - sized dust particles are difficult to change their movement direction due to inertia and are captured by the first two rows of semi - broken flour dust filter membrane clips (53). Smaller - sized dust particles will continue to move with the dust - laden air flow and are sequentially captured by the subsequent dust filter membrane clips (53) due to inertia. Finally, the residual dust - laden air flow after being processed by the multi - stage inertial dust collection filter membrane array enters the residual dust collection cavity (55). The filter membrane on the residual dust collection drawer (54) makes the final capture treatment of the residual dust therein, and outputs dust - free air flow to the negative pressure fan (4).

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