Swing type coal preparation device

Abstract

The embodiment of the invention provides a swing type coal dressing device. The swing type coal dressing device comprises a supporting frame, an outer cylinder, an inner net cylinder, a driving piece and a brush plate piece. The supporting frame comprises a frame body and a supporting shaft, and the supporting shaft is arranged on the frame body; the coal dressing barrel is arranged on the supporting frame in a swinging mode through a driving piece, the inner net barrel is arranged in the outer barrel, and a gap is formed between the inner net barrel and the outer barrel so that a crushed material screening channel can be formed between the outer barrel and the inner net barrel. One end of the plate brushing piece is connected to the supporting shaft, and the other end of the plate brushing piece abuts against the inner wall face of the inner net cylinder. According to the swing type coal dressing device, in the swing process of the outer barrel and the inner net barrel through the arranged brush plate piece, the brush plate piece and the inner net barrel can move relatively, and then the inner side wall of the net barrel is cleaned. Therefore, the swing type coal dressing device has the advantage of being high in coal dressing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of mining, and in particular to a swing type coal preparation device. Background Art

[0002] Raw coal is inevitably mixed with impurities during its generation, mining and transportation. As mining progresses, the quality of raw coal becomes worse and worse. In order to reduce impurities in raw coal and effectively and rationally utilize coal resources, raw coal can be washed. Coal preparation is also called coal washing, which is to use coal preparation equipment to select clean coal that meets the user's quality requirements from raw coal and screen it according to the particle diameter of the raw coal. In related technologies, most coal preparation devices use mesh plates to screen raw coal during use. As the working time increases, the mesh holes on the mesh plates will inevitably be blocked, which will affect the coal preparation efficiency during the process of washing raw coal. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a swing type coal preparation device. The swing type coal preparation device has the advantage of high coal preparation efficiency.

[0004] The swing type coal preparation device of the embodiment of the present invention comprises a support frame, an outer cylinder, an inner mesh cylinder, a driving member and a brush plate member.

[0005] The support frame includes a frame body and a support shaft, the support shaft is arranged on the frame body, the coal selection cylinder is swingably arranged on the support frame through a driving member, the inner mesh cylinder is arranged in the outer cylinder, and there is a gap between the inner mesh cylinder and the outer cylinder, so as to form a crushed material screening channel between the outer cylinder and the inner mesh cylinder; one end of the brush plate is connected to the support shaft, and the other end of the brush plate abuts against the inner wall surface of the inner mesh cylinder. It can be understood that the diameter of the inner mesh cylinder is smaller than the diameter of the outer cylinder; specifically, in the washing process, it is necessary to set coal washing water in the outer cylinder, and the upper ends of the outer cylinder and the inner mesh cylinder are provided with material gates to enable the raw coal to enter the inner mesh cylinder.

[0006] The swing type coal preparation device of the embodiment of the present invention can move the inner net cylinder relative to the brush plate when the outer cylinder and the inner net cylinder are swinging by means of the brush plate, and then the inner wall of the net cylinder is cleaned by the brush plate, and the raw coal blocked on the net cylinder is brushed off from the inner net cylinder, thus avoiding the problem of reduced coal selection efficiency caused by the blockage of the inner net cylinder. Therefore, the swing type coal preparation device improves the coal selection efficiency.

[0007] Therefore, the swing type coal preparation device according to the embodiment of the present invention has the advantage of high coal preparation efficiency.

[0008] In some embodiments, the brush plate member includes a support rod, an arc plate and a brush head, one end of the support rod is connected to the support shaft, the other end of the support rod is connected to the arc plate, the brush head is arranged on the arc plate, and the brush head abuts against the inner wall surface of the inner mesh tube.

[0009] In some embodiments, the brush plate member has a first brush plate member and a second brush plate member, the outer cylinder and the inner mesh cylinder have a swing angle of 200°-300°, the first brush plate member and the second brush plate member are spaced apart and symmetrically arranged along the circumference of the inner mesh cylinder, and the angle between the first brush plate member and the second brush plate member and the vertical direction is 30°-45°.

[0010] In some embodiments, one end of the outer cylinder and the inner net cylinder has a connecting rod, and the other end of the outer cylinder and the inner net cylinder has a connecting hole, and the connecting rod is inserted into the connecting hole to achieve synchronous rotation of the outer cylinder and the inner net cylinder.

[0011] In some embodiments, the driving member includes a forward and reverse motor, a driving tooth and a driven tooth, a bearing is arranged in the driven tooth, the bearing is sleeved on the support shaft, the driving tooth is sleeved on the main shaft of the forward and reverse motor, and the driving tooth and the driven tooth are meshed for transmission.

[0012] In some embodiments, the swing-type coal selection device further includes an airflow backflush assembly, a portion of which extends between the outer cylinder and the inner mesh cylinder, and an air outlet of the airflow backflush assembly is arranged toward the inner mesh cylinder.

[0013] In some embodiments, the airflow backflush assembly includes a connecting pipe, an air duct and a plurality of nozzles, the connecting pipe extends axially along the inner mesh tube, and the connecting pipe is arranged in the crushed material screening channel between the outer tube and the inner mesh tube, the plurality of nozzles are arranged at intervals along the extension direction of the connecting pipe, and the air duct is connected to the connecting pipe to achieve connection with an external air source.

[0014] In some embodiments, the plurality of air jets extend radially of the inner net cylinder.

[0015] In some embodiments, the air guide tube includes a hose segment and a support tube segment, the support tube segment is a bent tube segment, the hose segment extends along an axial direction perpendicular to the inner mesh tube, one end of the support tube segment is connected to the connecting tube, and the other end of the support tube segment is connected to the hose segment.

[0016] In some embodiments, the crushed material screening channel has an exhaust port, and the exhaust port is arranged at the end of the outer cylinder in the direction of length extension.

[0017] In some embodiments, the air source pump includes a sleeve, a piston, a return spring and a one-way valve tube, the one-way valve tube is connected to the air inlet of the air duct, the sleeve is communicated with the one-way valve tube, the return spring abuts between the piston and the one-way valve tube to drive the piston to reset in a natural state, and the piston is movably arranged in the sleeve to provide jet in the air duct through the movement of the piston.

[0018] In some embodiments, the outer cylinder and the inner net cylinder are both inclined, and spirally arranged guide protrusions are provided on the inner wall surfaces of the outer cylinder and the inner net cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereoscopic diagram of a swing type coal preparation device according to an embodiment of the present invention.

[0020] Figure 2 It is a three-dimensional diagram of a swing-type coal preparation device according to an embodiment of the present invention, with the frame omitted.

[0021] Figure 3 It is a three-dimensional diagram of a swing type coal preparation device according to an embodiment of the present invention, omitting the frame and part of the outer cylinder.

[0022] Figure 4 It is a cross-sectional view of a swing type coal preparation device according to an embodiment of the present invention.

[0023] Figure 5 It is a schematic structural diagram of an air source pump according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Frame 11; Support shaft 12;

[0026] Outer cylinder 2; bump 21;

[0027] Inner net tube 3; connecting rod 31;

[0028] Driving member 4; motor 41; driving gear 42; driven gear 43;

[0029] Brush plate 5; support rod 51; curved plate 52; brush head 53;

[0030] Airflow backflush assembly 6; connecting pipe 71; air guide pipe 72; hose section 721; supporting pipe section 722;

[0031] Jet head 73;

[0032] Air source pump 74 ; sleeve 741 ; piston 742 ; return spring 743 ; one-way valve tube 744 ; ball 745 ; first one-way valve 746 ; second one-way valve 747 . DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] Reference below Figure 1-Figure 5 A swing type coal preparation device according to an embodiment of the present invention is described.

[0035] The swing type coal preparation device of the embodiment of the present invention comprises a support frame, an outer cylinder 2, an inner net cylinder 3, a driving member 4 and a brush plate member 5.

[0036] The support frame includes a frame body 11 and a support shaft 12, and the support shaft 12 is arranged on the frame body 11; the coal selection drum is swingably arranged on the support frame through a driving member 4 (the coal material is screened through the inner mesh drum 3 during the swinging movement), the inner mesh drum 3 is arranged in the outer drum 2, and there is a gap between the inner mesh drum 3 and the outer drum 2 to form a crushed material screening channel between the outer drum 2 and the inner mesh drum 3; one end of the brush plate member 5 is connected to the support shaft 12, and the other end of the brush plate member 5 abuts against the inner wall surface of the inner mesh drum 3. It can be understood that the diameter of the inner mesh drum 3 is smaller than the diameter of the outer drum 2; specifically, in the washing process, it is necessary to set coal washing water in the outer drum 2, and the upper ends of the outer drum 2 and the inner mesh drum 3 are provided with material gates to enable the raw coal to enter the inner mesh drum 3.

[0037] The swing type coal separation device of the embodiment of the present invention can be provided with a brush plate 5 so that the inner net cylinder 3 can move relative to the brush plate 5 during the swinging of the outer cylinder 2 and the inner net cylinder 3, and then the inner wall of the net cylinder can be cleaned by the brush plate 5, and the raw coal blocked on the net cylinder can be brushed off from the inner net cylinder 3, thereby avoiding the problem of reduced coal separation efficiency caused by the blockage of the inner net cylinder 3. Therefore, the swing type coal separation device improves the coal separation efficiency.

[0038] Therefore, the swing type coal preparation device according to the embodiment of the present invention has the advantage of high coal preparation efficiency.

[0039] Specifically, during washing, the raw coal is placed in the inner mesh tube 3, and coal washing water is filled into the outer tube 2 and the inner mesh tube 3. The volume of the coal washing water is about half of the outer tube 2. The raw coal with low density will float on the water surface, the raw coal with high density and relatively large particles will remain on the inner mesh tube 3, and the raw coal with relatively small particles will fall into the crushing screening channel between the outer tube 2 and the inner mesh tube 3.

[0040] like Figure 4 As shown, the brush plate member 5 includes a support rod 51, an arc plate 52 and a brush head 53. One end of the support rod 51 is connected to the support shaft 12, and the other end of the support rod 51 is connected to the arc plate 52. The brush head 53 is arranged on the arc plate 52, and the brush head 53 abuts against the inner wall surface of the inner mesh tube 3.

[0041] The swing type coal separation device of the embodiment of the present invention divides the brush plate 5 into a support rod 51, an arc plate 52 and a brush head 53. The arc plate 52 can support the brush head 53, thus providing good support for the structure of the brush head 53. Furthermore, the swing type coal separation device has the advantage of good structural stability.

[0042] Further, the arc plate 52, the outer cylinder 2 and the inner net cylinder 3 are arranged concentrically. Thus, the arc plate 52 can be kept in close contact with the inner net cylinder 3 during the swinging of the outer cylinder 2 and the inner net cylinder 3, so as to achieve the effect of clearing the mesh of the inner net cylinder 3.

[0043] like Figure 4 As shown, the brush plate member 5 includes a first brush plate member 5 and a second brush plate member 5, the swing angle of the outer cylinder 2 and the inner mesh cylinder 3 is 200°-300°, the first brush plate member 5 and the second brush plate member 5 are spaced apart and symmetrically arranged along the circumference of the inner mesh cylinder 3, and the angle between the first brush plate member 5 and the second brush plate member 5 and the vertical direction is 30°-45°.

[0044] The swing type coal cleaning device of the embodiment of the present invention is symmetrically arranged by the first brush plate member 5 and the second brush plate member 5, and the angle between the first brush plate member 5 and the second brush plate member 5 and the vertical direction is 30°-45°. Therefore, it can be ensured that the brush plate member 5 brushes all areas on the inner net tube 3 to the maximum extent. Therefore, it can prevent the inner net tube 3 from being brushed in all directions, avoiding the problem of dead angles that affect the coal cleaning efficiency. Furthermore, the swing type coal cleaning device of the embodiment of the present invention has the advantage of further improving the high coal cleaning efficiency.

[0045] like Figure 3 and Figure 4 As shown, one end of the outer cylinder 2 and the inner net cylinder 3 has a connecting rod 31, and the other end of the outer cylinder 2 and the inner net cylinder 3 has a connecting hole, and the connecting rod 31 is inserted into the connecting hole to realize the synchronous rotation of the outer cylinder 2 and the inner net cylinder 3.

[0046] The swing type coal separation device of the embodiment of the present invention achieves fixing of the relative positions of the outer cylinder 2 and the inner net cylinder 3 by plugging and matching the outer cylinder 2 and the inner net cylinder 3 through the connecting rod 31 and the connecting hole. Therefore, the swing type coal separation device of the embodiment of the present invention has the advantage of simple structure.

[0047] like Figure 1 and Figure 3 As shown, the driving member 4 includes a forward and reverse motor 41, a driving tooth 42 and a driven tooth 43. A bearing is arranged in the driven tooth 43, and the bearing sleeve is arranged on the support shaft 12. The driving tooth 42 is sleeved on the main shaft of the forward and reverse motor 41, and the driving tooth 42 and the driven tooth 43 are meshed for transmission.

[0048] The swing type coal preparation device of the embodiment of the present invention is provided with a driving member 4 divided into a motor 41, a driving tooth 42 and a driven tooth 43, a bearing is provided in the driven tooth 43, and the bearing sleeve is provided on the support shaft 12. Therefore, the swing type coal preparation device of the embodiment of the present invention has the advantage of small transmission resistance.

[0049] Optionally, the ratio of the number of teeth of the active teeth 42 to the number of teeth of the driven teeth 43 is 1:10-50. Thus, it can be ensured that the outer cylinder 2 and the inner net cylinder 3 can swing when the motor 41 rotates forward and reversely.

[0050] like Figure 1 and Figure 3 As shown, the swing type coal preparation device of the embodiment of the present invention further includes an airflow backflush assembly 6 , a portion of which extends between the outer cylinder 2 and the inner net cylinder 3 , and an air outlet of the airflow backflush assembly 6 is arranged toward the inner net cylinder 3 .

[0051] The swing type coal separation device of the embodiment of the present invention can further clear the blocked area of ​​the inner net tube 3 by means of the airflow back-blowing assembly 6, further avoiding the problem of low washing efficiency caused by blockage. Thus, it has the advantage of further improving the raw coal washing efficiency.

[0052] like Figure 1 and Figure 3 As shown, the airflow backflush assembly 6 includes a connecting pipe 71, an air guide pipe 72 and a plurality of air jet heads 73. The connecting pipe 71 extends along the axial direction of the inner net tube 3, and the connecting pipe 71 is arranged in the crushed material screening channel between the outer tube 2 and the inner net tube 3. The plurality of air jet heads 73 are arranged at intervals along the extension direction of the connecting pipe 71, and the air guide pipe 72 is connected to the connecting pipe 71 to realize connection with an external air source.

[0053] The swing-type coal preparation device of the embodiment of the present invention divides the airflow backblowing assembly 6 into a connecting pipe 71, an air guide pipe 72 and a plurality of air jet heads 73. The plurality of air jet heads 73 are arranged on the connecting pipe 71 at intervals along the extension direction of the connecting pipe 71. This can increase the range of the air jet heads 73 to clear the inner net tube 3, thereby having the advantage of improving the coal preparation efficiency.

[0054] like Figure 1 and Figure 3 As shown, the plurality of air jet heads 73 all extend along the radial direction of the inner net tube 3. Thus, the blowing and plugging effect on the inner net tube 3 is enhanced.

[0055] like Figure 1 and Figure 3 As shown, the air guide tube 72 includes a hose segment 721 and a support segment 722. The support segment 722 is a bent segment. The hose segment 721 extends along an axial direction perpendicular to the inner net tube 3. One end of the support segment 722 is connected to the connecting tube 71, and the other end of the support segment 722 is connected to the hose segment 721.

[0056] The swing type coal preparation device of the embodiment of the present invention divides the air guide pipe 72 into a hose section 721 and a support pipe section 722. The hose section 721 is easy to install during installation.

[0057] like Figure 1 and Figure 3 As shown, the air source pump 74 includes a sleeve 741, a piston 742, a return spring 743 and a one-way valve tube 744. The one-way valve tube 744 is connected to the air inlet of the air guide tube 72. The sleeve 741 is communicated with the one-way valve tube 744. The return spring 743 abuts between the piston 742 and the one-way valve tube 744 to drive the piston 742 to reset in a natural state. The piston 742 is movably arranged in the sleeve 741 so as to provide jetting in the air guide tube 72 through the movement of the piston 742.

[0058] The swing type coal preparation device of the embodiment of the present invention divides the air source pump 74 into a sleeve 741, a piston 742, and a reset and one-way valve pipe 744. By relying on the structure of the piston 742, the airflow back-blowing assembly 6 can provide an air source during the reciprocating movement of the piston 742. Therefore, there is no need to provide an air source separately, which has the advantages of relatively simple structure and good air volume controllability.

[0059] like Figure 2 and Figure 5 As shown, further, both ends of the one-way valve tube 744 are provided with a first one-way valve 746 and a second one-way valve 747. The first one-way valve 746 is arranged between the one-way valve tube 744 and the air guide tube 72. The end of the outer wall of the outer cylinder 2 has a protrusion 21, and the top of the piston 742 has a ball 745 structure. The sleeve 741 and the piston 742 are both arranged in a vertical direction so that the outer cylinder 2 can periodically and intermittently squeeze the ball 745 and drive the movement of the piston 742 during rotation. When the protrusion 21 is out of contact with the ball 745, the piston 742 will be reset under the action of the reset spring 743. During the reset, the air pressure in the one-way valve tube 744 becomes smaller, and the gas enters the one-way valve tube 744 through the second one-way valve 747. When the piston 742 is squeezed, the rest will enter the connecting tube 71 and the air guide tube 72 through the first one-way valve 746, and then be sprayed toward the inner net tube 3 by multiple nozzles 73.

[0060] The crushed material screening channel is provided with an exhaust port, which is arranged at the end of the length extension direction of the outer tube 2. This has the advantage of preventing the inner air pressure of the outer tube 2 from being high during backblowing.

[0061] The outer cylinder 2 and the inner net cylinder 3 are both inclined, and spiral guide protrusions are provided on the inner wall surfaces of the outer cylinder 2 and the inner net cylinder 3. This helps to turn over the raw coal attached to the bottom walls of the outer cylinder 2 and the inner net cylinder 3 during the swinging of the outer cylinder 2 and the inner net cylinder 3, and helps to screen the raw coal according to its particle size and quality.

[0062] Optionally, the outer cylinder 2 and the inner mesh cylinder 3 are both inclined at an angle of 5°-10°. A slight inclination can slow down the screening of raw coal, avoid the problem of raw coal moving too fast in the outer cylinder 2 and the inner mesh cylinder 3 and causing accumulation at the ends, and avoid the problem of too slow guide movement speed due to too small an inclination angle.

[0063] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction 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 described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A swing type coal preparation device, characterized in that: include: A support frame, the support frame comprising a frame body and a support shaft, the support shaft being arranged on the frame body; An outer cylinder, an inner mesh cylinder and a driving member, wherein the coal separation cylinder is swingably arranged on the support frame through the driving member, the inner mesh cylinder is arranged in the outer cylinder, and a gap is provided between the inner mesh cylinder and the outer cylinder so as to form a crushed material screening channel between the outer cylinder and the inner mesh cylinder; A brush plate component, one end of which is connected to the support shaft, and the other end of which is in contact with the inner wall surface of the inner net cylinder.

2. The swing type coal preparation device according to claim 1, characterized in that: The brush plate member includes a support rod, an arc plate and a brush head, one end of the support rod is connected to the support shaft, the other end of the support rod is connected to the arc plate, the brush head is arranged on the arc plate, and the brush head abuts against the inner wall surface of the inner mesh tube.

3. The swing type coal preparation device according to claim 1, characterized in that: The brush plate member comprises a first brush plate member and a second brush plate member, the outer cylinder and the inner mesh cylinder have a swing angle of 200°-300°, the first brush plate member and the second brush plate member are spaced apart and symmetrically arranged along the circumference of the inner mesh cylinder, and the angle between the first brush plate member and the second brush plate member and the vertical direction is 30°-45°.

4. The swing type coal preparation device according to claim 1, characterized in that: One end of the outer cylinder and the inner net cylinder has a connecting rod, and the other end of the outer cylinder and the inner net cylinder has a connecting hole. The connecting rod is inserted into the connecting hole to realize the synchronous rotation of the outer cylinder and the inner net cylinder.

5. The swing type coal preparation device according to claim 1, characterized in that: The driving member includes a forward and reverse motor, a driving tooth and a driven tooth. A bearing is arranged inside the driven tooth. The bearing is sleeved on the support shaft. The driving tooth is sleeved on the main shaft of the forward and reverse motor. The driving tooth and the driven tooth are meshed for transmission.

6. The swing type coal preparation device according to claim 1, characterized in that: It also includes an airflow backflush component, a part of which extends between the outer cylinder and the inner net cylinder, and an air outlet of the airflow backflush component is arranged toward the inner net cylinder.

7. The swing type coal preparation device according to claim 6, characterized in that: The airflow backflush assembly includes an air source pump, a connecting pipe, an air guide pipe and a plurality of jet heads. The connecting pipe extends along the axial direction of the inner net tube, and the connecting pipe is arranged in the crushed material screening channel between the outer tube and the inner net tube. The plurality of jet heads are arranged at intervals along the extension direction of the connecting pipe, and the air guide pipe is connected to the connecting pipe to achieve connection with the air source pump.

8. The swing type coal preparation device according to claim 7, characterized in that: The plurality of air jet heads all extend along the radial direction of the inner net tube; And / or, the air guide tube includes a hose segment and a support tube segment, the support tube segment is a bent tube segment, the hose segment extends along an axial direction perpendicular to the inner net tube, one end of the support tube segment is connected to the connecting tube, and the other end of the support tube segment is connected to the hose segment.

9. The swing type coal preparation device according to claim 7, characterized in that: The air source pump includes a sleeve, a piston, a return spring and a one-way valve tube, the one-way valve tube is connected to the air inlet of the air duct, the sleeve is communicated with the one-way valve tube, the return spring abuts between the piston and the one-way valve tube to drive the piston to reset in a natural state, and the piston is movably arranged in the sleeve so as to provide air injection in the air duct through the movement of the piston.

10. The swing type coal preparation device according to claim 1, characterized in that: The crushed material screening channel is provided with an exhaust port, and the exhaust port is arranged at the end of the outer cylinder in the direction of the length extension; And / or, the outer cylinder and the inner net cylinder are both arranged obliquely, and spirally arranged guide protrusions are provided on the inner wall surfaces of the outer cylinder and the inner net cylinder.

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