Screening mechanism for coal mining

Abstract

The invention provides a coal mining screening mechanism which is characterized in that a heating unit is arranged on the surface of the side, attached to a joint, of a bearing cover, a mounting shell is fixed to the surface of the other side of the bearing cover, a driving assembly for forming one-way airflow at the joint hot compress position is arranged in the mounting shell, and the driving assembly absorbs moisture of air passing through the interior of the driving assembly; the two driving exercise assemblies are symmetrically arranged, and the two driving exercise assemblies are arranged on the two sides of the bearing cover and connected to the upper mounting cover and the lower mounting cover; the knee joint bends and stretches to drive the upper mounting cover and the lower mounting cover to rotate relatively, the driving exercise assembly provides resistance, and therefore the weight-bearing exercise effect is achieved. By constructing the constant-temperature drying and heating cavity and combining resistance-resistant exercise, hot compress and exercise collaboration is achieved, and the comfort, functionality and chronic pain relieving effect of knee joints are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coal screening, in particular to a coal mining screening mechanism. BACKGROUND

[0002] Coal, as an important basic energy in China, usually needs to go through crushing, screening, washing and other links after mining to remove gangue, soil and impurity particles and obtain different particle size of commercial coal.

[0003] In the process of coal screening, a drum screen structure is often used for grading treatment of raw coal. Such equipment is usually composed of a rotating screening drum and a driving mechanism. Through the cooperation of the rotation of the drum body and the screen hole, coal of different particle sizes is respectively discharged into the corresponding discharge channel, thereby completing the screening operation.

[0004] However, in the screening process, a large amount of dust is generated due to the constant tumbling, impact and scattering of coal in the drum body. Especially when the length of the screening drum is long or the amount of feed is large, dust is easy to form high-concentration accumulation in the middle and tail end areas of the drum body, and the traditional dust removal device is difficult to effectively control.

[0005] In the prior art, common dust removal methods include: A fixed spray dust removal system realizes fixed-point spraying by setting a plurality of spray heads above the screening drum, but the spraying area is fixed, it is difficult to take into account the entire screening length, and it is easy to cause an end dust removal blind area; A negative pressure air draft dust removal structure absorbs dust-containing gas into a dust collector by setting an air draft port, but its airflow distribution is uneven in long drum screening occasions, the dust removal efficiency of some areas is low, and the energy consumption is high.

[0006] Therefore, the existing coal drum screen equipment still has problems of insufficient dust removal coverage, serious dust retention and high energy consumption when facing long screening travel and wide dust distribution range, and an innovative structure with wider coverage, more flexible dust removal response and more efficient energy utilization is urgently needed.

[0007] Therefore, the coal mining screening mechanism is provided for the above problems. SUMMARY

[0008] The present application provides a coal mining screening mechanism to solve the problems of insufficient dust removal coverage, serious dust retention and high energy consumption of the coal drum screen equipment when facing long screening travel and wide dust distribution range.

[0009] The present application solves the above technical problems through the following technical solutions: The application provides a coal mining screening mechanism, which comprises a rack, a screening cylinder arranged on the rack, a support shaft arranged in the central axis area of the screening cylinder, two ends of the support shaft being installed on the rack through shaft sleeves, a plurality of connecting rods being fixed on the surface of the support shaft, and the connecting rods being fixed on the inner wall of the screening cylinder. A guide plate with a spiral structure is arranged on the inner wall of the screening cylinder, the guide plate and the support shaft are fixedly connected through connecting rods, and one end of the support shaft is connected with a first driving assembly. A dust falling assembly is arranged on the top of the screening cylinder, the dust falling assembly comprises a water spraying part which moves reciprocatingly along the axial direction of the screening cylinder, the water spraying part is drivingly connected with a second driving assembly.

[0010] The dust falling assembly can be moved to quickly fall the coal dust in a long screening stroke, and the dust falling assembly moves reciprocatingly above the screening cylinder, so that dust falling in a large range is realized.

[0011] In the technical scheme, the dust falling assembly comprises a bearing plate, the bearing plate is drivingly connected with the second driving assembly, and a plurality of dust falling units which are distributed at equal intervals are arranged on the bearing plate.

[0012] The second driving assembly drives the dust falling assembly to move reciprocatingly along the axial direction of the screening cylinder, so that the dust falling range is expanded.

[0013] The dust falling unit comprises a connecting part, the connecting part penetrates through the bearing plate, the bottom end of the connecting part is connected with the water spraying part, and the connecting part is connected with a water source.

[0014] The connecting part is connected with a water pump and a water source, the dust falling water is pumped into the connecting part through the water pump, and then sprayed out from the water spraying part.

[0015] In the technical scheme, the connecting part comprises a rotating tube, the rotating tube penetrates through the bearing plate, a rotating ring is fixedly connected to the top of the rotating tube, an outer cover is sleeved on the surface of the rotating ring, the rotating ring rotates in the outer cover, and a rotating sealing structure is formed between the rotating ring and the outer cover, an outer connecting pipe is fixedly connected to the top of the outer cover, the outer connecting pipe is connected with the water source, the bottom end of the rotating tube is connected with the water spraying part, and the outer cover is fixed on the bearing plate. The rotating tube is drivingly connected with a driving part, and the driving part drives the rotating tube to rotate in the outer cover.

[0016] During the movement of the dust falling unit along with the bearing plate, the driving part drives the rotating tube to rotate, so that the water spraying part is driven to rotate, and the dust falling range is further expanded.

[0017] In this technical solution, the driving unit includes a driven gear sleeved and fixed on the surface of the rotating tube. The driven gear meshes with the driving rack. The driving rack is distributed along the axial direction of the screening cylinder. The two ends of the driving rack are respectively fixed to the corresponding support frame through a connecting frame. The connecting frame includes a horizontal plate and a fixing rod. The end of the driving rack is fixed to the horizontal plate, and the horizontal plate is fixed to the support frame through the fixing rod.

[0018] In this technical solution, the water spraying part includes a connecting hose, one end of which is connected to and communicates with the bottom end of the rotating pipe, and the other end of which is connected to a connecting rigid pipe. The connecting rigid pipe is inclined, and a nozzle is connected to the end of the connecting rigid pipe. The bottom of the connecting rigid tube is provided with a guide part to push it to rotate, and a compensation member is provided between the connecting rigid tube and the rotating tube. The compensation member pushes the connecting rigid tube to the surface of the guide part.

[0019] During the rotation process, the rotating tube and the connecting rigid tube rotate synchronously, and the connecting rigid tube moves on the surface of the guide section.

[0020] In this technical solution, the guide part includes a guide ring, which is located at the bottom of the connecting rigid tube. The guide ring is fixed to the bearing plate by a synchronizing rod. The top sidewall of the guide ring is recessed downward to form multiple recessed surfaces distributed in a ring array. The recessed surfaces and the plane at the top of the guide ring together form a wave-shaped guide surface. The connecting rigid tube overlaps on the guide surface.

[0021] When the connecting rigid tube moves on the guide surface, it rotates vertically, thereby changing the elevation and depression angles of the nozzle's spray position, maximizing the dust suppression range and reducing dust suppression dead zones.

[0022] In this technical solution, the compensation component includes a telescopic guide rod, which has an arc-shaped structure. An arc-shaped spring is sleeved on the surface of the guide rod, and the two ends of the arc-shaped spring are respectively fixed to the two ends of the guide rod. The two ends of the guide rod are respectively fixed to the rotating tube and the connecting rigid tube.

[0023] The reaction force of the curved spring pushes the connecting rigid tube against the guide surface.

[0024] The guide rod is set vertically. When the connecting rigid tube rotates, the guide rod extends or shortens, guiding the rotation direction of the connecting rigid tube while maintaining synchronous rotation of the connecting rigid tube and the rotating tube.

[0025] In this technical solution, the first drive assembly includes a first motor, which is fixed on the frame. A first drive wheel is fixed on the output end of the first motor. The first drive wheel is connected to a first driven wheel via a first transmission belt. The first driven wheel is fixed on the end of the support shaft.

[0026] The first motor drives the first driven wheel to rotate via the first drive wheel and the first transmission belt, thereby driving the support shaft to rotate and causing the screening cylinder to rotate.

[0027] In this technical solution, the second drive assembly includes a threaded rod, the two ends of which are respectively connected to two support frames located at both ends of the frame. The threaded rod is connected to the support frames via bearings. The support frames have a "door" shaped structure and cover the top of the screening cylinder. The support frames are fixed to the frame. The threaded rod is fitted with a threaded sleeve, and the threaded sleeve and the threaded rod are connected by a threaded engagement. The threaded sleeve is fixed to the top of the dust suppression assembly, that is, fixed to the top of the support plate.

[0028] In this technical solution, the second drive assembly further includes a second motor, which is fixed on a mounting bracket, which is fixed on a frame. A second drive wheel is fixed on the output end of the second motor. The second drive wheel is rotatably connected to a second driven wheel via a second transmission belt. The second driven wheel is fixed on one end of a threaded rod.

[0029] The second motor drives the second driven wheel to rotate via the second drive wheel and the second transmission belt, which in turn drives the threaded rod to rotate. During the rotation of the threaded rod, the threaded rod pushes the threaded sleeve to move, thereby driving the bearing plate and the dust suppression unit on the bearing plate to move.

[0030] The second motor rotates forward and reverse, driving the support plate and dust suppression unit to reciprocate along the axial direction of the screening cylinder.

[0031] The size of the screening trough on the screening cylinder decreases from one side to the other. The end of the screening cylinder with the smallest screening trough is the feed end, and the other side is the final discharge end.

[0032] Preferably, the screening trough on the surface of the screening cylinder is divided into three parts, and each area of ​​the screening trough is provided with a discharge shell below it. The size of the screening trough increases from small to large, and the discharge shells below are successively the first discharge shell, the second discharge shell and the third discharge shell, and a fourth discharge shell is provided below the final discharge end of the screening cylinder.

[0033] The first, second, third, and fourth discharge shells are all fixed on the frame.

[0034] The first drive assembly is preferably located on the final discharge end side of the screening cylinder.

[0035] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0036] The positive and progressive effects of this invention are as follows: By setting up movable dust suppression components, it is possible to dynamically cover and quickly suppress dust generated along the length of the screen cylinder during the screening process.

[0037] The dust suppression component is installed above the screening cylinder and can reciprocate along the axial trajectory of the screening cylinder, thereby moving the effective range of the spray dust suppression accordingly.

[0038] Compared to traditional fixed spray or exhaust structures, this solution can maintain a uniform and efficient dust suppression effect even with a long screening process.

[0039] This effectively avoids the problems of dead zones in end-stage dust suppression and dust retention in the middle stage, significantly reducing the dust concentration throughout the entire screening space. This results in a dynamic dust suppression effect with wider coverage, faster response, and more efficient energy utilization. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 For the present invention Figure 1 A structural diagram from another perspective; Figure 3 For the present invention Figure 1 A schematic diagram of the structure viewed from below; Figure 4 For the present invention Figure 1 A top-view structural diagram; Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure at point AA; Figure 6 This is a schematic diagram of the connection structure between the second driving component and the dust suppression component of the present invention; Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point I; Figure 8 For the present invention Figure 6 A schematic diagram of the structure viewed from below; Figure 9 For the present invention Figure 6 A top-view structural diagram; Figure 10 For the present invention Figure 9 A three-dimensional structural diagram of the cross-section at point BB; Figure 11 For the present invention Figure 10 A magnified schematic diagram of the structure at point J.

[0041] Explanation of reference numerals in the attached figures 1. Frame; 11. First discharge shell; 12. Second discharge shell; 13. Third discharge shell; 14. Fourth discharge shell; 2. Support shaft; 21. Connecting rod; 22. Guide plate; 23. Bushing; 3. First drive assembly; 31. First motor; 32. First drive wheel; 33. First driven wheel; 34. First transmission belt; 4. Support frame; 5. Second drive assembly; 51. Second motor; 52. Second drive wheel; 53. Second driven wheel; 54. Threaded rod; 55. Mounting bracket; 56. Threaded sleeve; 57. Second transmission belt; 58. Bearing; 6. Dust suppression assembly; 61. Support plate; 62. Connecting part; 621. Rotating tube; 622. Rotating ring; 623. Outer cover; 624. Outer connecting pipe; 63. Water spraying part; 631. Connecting hose; 632. Connecting rigid pipe; 633. Spray head; 634. Guide rod; 64. Synchronizing rod; 65. Guide part; 651. Guide ring; 652. Recessed surface; 66. Driven gear; 67. Drive rack; 671. Horizontal plate; 672. Fixing rod; 7. Screening cylinder. Detailed Implementation

[0042] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0043] like Figure 1 and Figure 2 As shown, the coal mining screening mechanism includes a frame 1, a screening cylinder 7 is provided on the frame 1, a support shaft 2 is provided in the central axis area of ​​the screening cylinder 7, the two ends of the support shaft 2 are installed on the frame 1 through bushings 23, and a plurality of connecting rods 21 are fixed on the surface of the support shaft 2, and the connecting rods 21 are fixed on the inner wall of the screening cylinder 7. The inner wall of the screening cylinder 7 is provided with a spiral guide plate 22, and the guide plate 22 and the support shaft 2 are fixedly connected by a connecting rod. One end of the support shaft 2 is connected to the first drive assembly 3. The top of the screening cylinder 7 is provided with a dust suppression component 6. The dust suppression component 6 includes a water spray section 63 that reciprocates along the axial direction of the screening cylinder 7. The water spray section 63 is connected to the second drive component 5.

[0044] like Figures 6-8 As shown, the dust suppression component 6 includes a support plate 61, which is connected to the second drive component 5. The support plate 61 is provided with a plurality of dust suppression units distributed at equal intervals.

[0045] The second drive component 5 drives the dust suppression component 6 to reciprocate along the axial direction of the screening cylinder 7, thereby expanding the dust suppression range.

[0046] The dust suppression unit includes a connecting part 62, which penetrates the support plate 61 and is connected to the water spraying part 63 at its bottom end. The connecting part 62 is connected to an external water source.

[0047] The connecting part 62 is connected to an external water pump and water source. The water pump is used to pump dust suppression water into the connecting part 62 and then spray it out from the spraying part 63.

[0048] Specifically, the connecting part 62 includes a rotating pipe 621 that penetrates the supporting plate 61. A rotating ring 622 is fixedly connected to the top of the rotating pipe 621. An outer cover 623 is fitted onto the surface of the rotating ring 622, and the rotating ring 622 rotates inside the outer cover 623, forming a rotating sealing structure with the outer cover 623. An outer pipe 624 is fixedly connected to the top of the outer cover 623 and is connected to a water source. The bottom end of the rotating pipe 621 is connected to the water spray part 63, and the outer cover 623 is fixed on the supporting plate 61. The rotating tube 621 is connected to the drive unit, and the drive unit drives the rotating tube 621 to rotate inside the outer cover 623.

[0049] As the dust suppression unit moves along with the support plate 61, the drive unit drives the rotation pipe 621 to rotate, which in turn drives the water spray unit 63 to rotate, further expanding the dust suppression range.

[0050] Specifically, the driving unit includes a driven gear 66 sleeved and fixed on the surface of the rotating tube 621. The driven gear 66 meshes with a driving rack 67. The driving rack 67 is distributed along the axial direction of the screening cylinder 7. The two ends of the driving rack 67 are respectively fixed to the corresponding support frame 4 by connecting frames. The connecting frame includes a horizontal plate 671 and a fixing rod 672. The end of the driving rack 67 is fixed on the horizontal plate 671, and the horizontal plate 671 is fixed to the support frame 4 by the fixing rod 672.

[0051] When the rotating tube 621 moves axially upward in the screening cylinder 7, the driven gear 66 on its surface moves on the drive rack 67 and rotates simultaneously, thereby driving the rotating tube 621 to rotate.

[0052] like Figure 10 and Figure 11 As shown, the water spray unit 63 includes a connecting hose 631. One end of the connecting hose 631 is connected to and communicates with the bottom end of the self-rotating pipe 621. The other end of the connecting hose 631 is connected to a connecting rigid pipe 632. The connecting rigid pipe 632 is inclined, and a nozzle 633 is connected to the end of the connecting rigid pipe 632. The bottom of the connecting rigid tube 632 is provided with a guide part 65 to push it to rotate, and a compensation member is provided between the connecting rigid tube 632 and the rotating tube 621. The compensation member pushes the connecting rigid tube 632 to the surface of the guide part 65.

[0053] During the rotation process, the rotating tube 621 and the connecting rigid tube 632 rotate synchronously, and the connecting rigid tube 632 moves on the surface of the guide part 65.

[0054] The guide portion 65 includes a guide ring 651, which is located at the bottom of the connecting rigid tube 632. The guide ring 651 is fixed to the bearing plate 61 by a synchronizing rod 64. The top sidewall of the guide ring 651 is recessed downward to form multiple recessed surfaces 652 arranged in a ring array. The recessed surfaces 652 and the plane at the top of the guide ring 651 together form a wave-shaped guide surface. The connecting rigid tube 632 overlaps on the guide surface.

[0055] By setting a connecting rigid tube 632 that can move on the guide surface, the connecting rigid tube 632 can rotate in the vertical direction during movement, thereby realizing the automatic adjustment of the spray angle of the nozzle 633.

[0056] When the rigid tube 632 rotates vertically, the spray direction of the nozzle 633 will change its elevation and depression angles, so that the spray flow field is distributed within different height and angle ranges.

[0057] With this structural design, the nozzle can dynamically cover different spatial areas above and on both sides of the screening cylinder 7, thereby significantly expanding the dust suppression range.

[0058] Compared with traditional fixed-angle spraying methods, this solution can effectively reduce dust suppression dead zones and dust retention areas, achieve a more uniform and efficient dust suppression effect, and improve the utilization efficiency of unit water volume, thus achieving the goal of "low water and high efficiency" in energy-saving dust suppression.

[0059] The compensation component includes a telescopic guide rod 634, which has an arc-shaped structure. An arc-shaped spring is sleeved on the surface of the guide rod 634, and the two ends of the arc-shaped spring are respectively fixed to the two ends of the guide rod 634. The two ends of the guide rod 634 are respectively fixed to the self-rotating tube 621 and the connecting rigid tube 632.

[0060] The reaction force of the curved spring pushes the connecting rigid tube 632 against the guide surface.

[0061] The guide rod 634 is set vertically. When the connecting rigid tube 632 rotates, the guide rod 634 extends or shortens, guiding the rotation direction of the connecting rigid tube 632 while maintaining the synchronous rotation of the connecting rigid tube 632 and the rotating tube 621.

[0062] like Figures 1-4As shown, the first drive assembly 3 includes a first motor 31, which is fixed on the frame 1. A first drive wheel 32 is fixed on the output end of the first motor 31. The first drive wheel 32 is connected to a first driven wheel 33 via a first transmission belt 34. The first driven wheel 33 is fixed on the end of the support shaft 2.

[0063] The first motor 31 drives the first driven wheel 33 to rotate via the first drive wheel 32 and the first transmission belt 34, thereby driving the support shaft 2 to rotate and driving the screening cylinder 7 to rotate.

[0064] The second drive assembly 5 includes a threaded rod 54, the two ends of which are respectively connected to two support frames 4 located at both ends of the frame 1. The threaded rod 54 is connected to the support frame 4 through a bearing 58. The support frame 4 has a "door" shaped structure and covers the top of the screening cylinder 7. The support frame 4 is fixed to the frame 1. The threaded rod 54 is fitted with a threaded sleeve 56, and the threaded sleeve 56 and the threaded rod 54 are connected by a threaded engagement. The threaded sleeve 56 is fixed to the top of the dust suppression assembly 6, that is, fixed to the top of the support plate 61.

[0065] The second drive assembly 5 also includes a second motor 51, which is fixed on a mounting bracket 55, which is fixed on a frame 1. A second drive wheel 52 is fixed on the output end of the second motor 51. The second drive wheel 52 is rotatably connected to a second driven wheel 53 via a second transmission belt 57. The second driven wheel 53 is fixed on one end of a threaded rod 54.

[0066] The second motor 51 drives the second driven wheel 53 to rotate via the second drive wheel 52 and the second transmission belt 57, thereby driving the threaded rod 54 to rotate. During the rotation, the threaded rod 54 pushes the threaded sleeve 56 to move, thereby driving the support plate 61 and the dust removal unit on the support plate 61 to move.

[0067] The second motor 51 rotates forward and reverse, driving the bearing plate 61 and the dust removal unit to reciprocate along the axial direction of the screening cylinder 7.

[0068] To prevent the threaded sleeve 56 from rotating, a protrusion can be fixed on the threaded sleeve 56, and then the protrusion can be slidably sleeved on the straight rod. The straight rod is set parallel to the threaded rod 54, and the two ends of the straight rod are fixed on two support frames 4 or two mounting frames 55 respectively. The straight rod is not shown in the figure.

[0069] The size of the screening trough on the screening cylinder 7 decreases from one side to the other. The end of the screening cylinder 7 with the smallest screening trough is the feed end, and the other side is the final discharge end.

[0070] Preferably, the screening groove on the surface of the screening cylinder 7 is divided into three parts, and each area of ​​the screening groove is provided with a discharge shell below it. The size of the screening groove increases from small to large. The discharge shells below are, in order, the first discharge shell 11, the second discharge shell 12 and the third discharge shell 13, and a fourth discharge shell 14 is provided below the final discharge end of the screening cylinder 7.

[0071] The first discharge shell 11, the second discharge shell 12, the third discharge shell 13 and the fourth discharge shell 14 are all fixed on the frame 1.

[0072] The first drive assembly 3 is preferably located on the final discharge end side of the screening cylinder 7.

[0073] This invention is not limited to the embodiments described above. Any changes in shape or structure shall fall within the protection scope of this invention. The protection scope of this invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of this invention, but all such changes and modifications shall fall within the protection scope of this invention.

Claims

1. A coal mining screening mechanism, including a frame (1), a screening cylinder (7) is provided on the frame (1), a support shaft (2) is provided in the central axis area of ​​the screening cylinder (7), the two ends of the support shaft (2) are installed on the frame (1) through bushings (23), and a plurality of connecting rods (21) are fixed on the surface of the support shaft (2), and the connecting rods (21) are fixed on the inner wall of the screening cylinder (7); The inner wall of the screening cylinder (7) is provided with a spiral guide plate (22), and the guide plate (22) and the support shaft (2) are fixedly connected by a connecting rod. One end of the support shaft (2) is connected to the first drive assembly (3). The characteristic feature is that: The top of the screening cylinder (7) is provided with a dust suppression component (6), which includes a water spray section (63) that reciprocates along the axial direction of the screening cylinder (7) and is connected to the second drive component.

2. The coal mining screening mechanism as described in claim 1, characterized in that: The dust suppression component (6) includes a support plate (61), which is connected to the second drive component. The support plate (61) is provided with a plurality of dust suppression units distributed at equal intervals.

3. The coal mining screening mechanism as described in claim 2, characterized in that: The dust suppression unit includes a connecting part (62) that penetrates the bearing plate (61) and the bottom end of the connecting part (62) is connected to the water spraying part (63).

4. The coal mining screening mechanism as described in claim 3, characterized in that: The connecting part (62) includes a rotating tube (621) that passes through the bearing plate (61). A rotating ring (622) is fixedly connected to the top of the rotating tube (621). An outer cover (623) is fitted onto the surface of the rotating ring (622), and the rotating ring (622) rotates inside the outer cover (623). An outer pipe (624) is fixedly connected to the top of the outer cover (623). The bottom end of the rotating tube (621) is connected to the water spray part (63). The rotating tube (621) is connected to the drive unit, and the drive unit pushes the rotating tube (621) to rotate inside the outer cover (623).

5. The coal mining screening mechanism as described in claim 4, characterized in that: The drive unit includes a driven gear (66) sleeved and fixed on the surface of the rotating tube (621). The driven gear (66) meshes with the drive rack (67). The drive rack (67) is distributed along the axial direction of the screening cylinder (7). The two ends of the drive rack (67) are respectively fixed on the corresponding support frame (4) by the connecting frame.

6. The coal mining screening mechanism as described in claim 3, characterized in that: The water spray unit (63) includes a connecting hose (631), one end of which is connected to the bottom end of the self-rotating pipe (621), and the other end of which is connected to a connecting rigid pipe (632). A nozzle (633) is connected to the end of the connecting rigid pipe (632). The bottom of the connecting rigid tube (632) is provided with a guide part (65) to push it to rotate, and a compensation member is provided between the connecting rigid tube (632) and the rotating tube (621). The compensation member pushes the connecting rigid tube (632) to the surface of the guide part (65).

7. The coal mining screening mechanism as described in claim 6, characterized in that: The guide portion (65) includes a guide ring (651), which is located at the bottom of the connecting rigid tube (632). The top sidewall of the guide ring (651) is recessed downward to form a plurality of recessed surfaces (652) arranged in a ring array. The recessed surfaces (652) and the plane at the top of the guide ring (651) together form a wave-shaped guide surface. The connecting rigid tube (632) overlaps on the guide surface.

8. The coal mining screening mechanism as described in claim 6, characterized in that: The compensation component includes a telescopic guide rod (634), which has an arc-shaped structure. An arc-shaped spring is sleeved on the surface of the guide rod (634), and the two ends of the arc-shaped spring are respectively fixed to the two ends of the guide rod (634). The two ends of the guide rod (634) are respectively fixed to the rotating tube (621) and the connecting rigid tube (632).

9. The coal mining screening mechanism as described in claim 1, characterized in that: The first drive assembly (3) includes a first motor (31), which is fixed on the frame (1). A first drive wheel (32) is fixed on the output end of the first motor (31). The first drive wheel (32) is connected to the first driven wheel (33) via a first transmission belt (34). The first driven wheel (33) is fixed on the end of the support shaft (2).

10. The coal mining screening mechanism as described in claim 1, characterized in that: The second drive assembly (5) includes a threaded rod (54), the two ends of which are connected to two support frames (4) located at the two ends of the frame (1), the support frames (4) are in the shape of a "door" and cover the top of the screening cylinder (7), and the support frames (4) are fixed on the frame (1). The threaded rod (54) is fitted with a threaded sleeve (56), and the threaded sleeve (56) and the threaded rod (54) are connected by a threaded engagement. The threaded sleeve (56) is fixed to the top of the dust suppression assembly (6). It also includes a second motor (51), which is fixed on a mounting bracket (55) which is fixed on a frame (1). A second drive wheel (52) is fixed on the output end of the second motor (51). The second drive wheel (52) is rotatably connected to a second driven wheel (53) via a second transmission belt (57). The second driven wheel (53) is fixed on one side end of a threaded rod (54).

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