Spiral conveying device for coal fines

Abstract

The invention relates to the technical field of coal conveying equipment, and provides a fine coal spiral conveying device which comprises a rack, a spiral conveying unit and an impurity removing unit. The spiral conveying unit is arranged on the rack and provided with a conveying cavity channel used for bearing and conveying coal. The impurity removal unit is arranged on the rack, located above the conveying cavity channel and provided with an impurity removal bucket which slides in a lifting mode relative to the rack and is rotationally arranged, and the rotation mode of the impurity removal bucket is revolution; the impurity removal bucket is configured to slide downwards into the conveying cavity channel or slide upwards to leave the conveying cavity channel, so that the impurity removal bucket enters the conveying cavity channel and is used for collecting impurities; or the impurity removal bucket leaves the conveying cavity channel and is used for taking away the impurities. By means of the technical scheme, the problems that in the related technology, when impurities in coal are removed in the mode that circulating water and an overflow opening are matched, water consumption is large, and the operation steps are tedious due to the fact that overflow water is subjected to secondary treatment to collect the impurities are solved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of coal conveying equipment, and in particular, to a spiral conveying device for fine coal. Background Art

[0002] Coal is not only an important energy source, but also a key raw material for the metallurgical and chemical industries. Its mining process is usually excavated from underground and then transported to the ground to meet the needs of various fields. However, the raw coal obtained from mining contains a large amount of impurities. During rough processing, although most of the visible gangue and large-volume debris can be removed by screening, some impurities still remain, affecting the quality of the coal. In the coal preparation stage, the coal is sorted with the help of sorting media. Although some impurities can be screened out by discharging coal slime, some small particles of impurities are still mixed into the coal. In order to further remove impurities, it is proposed to remove impurities by water washing, water overflow, and recycling separation. However, this method consumes a lot of water and requires secondary treatment of the overflow water to achieve the effect of cleaning and collecting impurities. The process is time-consuming, labor-intensive, and costly, so it is necessary to improve and optimize the existing technology. Summary of the invention

[0003] To overcome the above-mentioned defects, an embodiment of the present disclosure provides a coal fine material screw conveying device, which solves the problem that when the related technology uses circulating water and overflow ports to remove impurities in the coal, the water consumption is large and the overflow water is treated twice to collect impurities, resulting in cumbersome operating steps.

[0004] According to one aspect, at least one embodiment of the present disclosure provides a coal fine material screw conveyor, comprising: frame; A screw conveying unit is arranged on the frame and has a conveying cavity for carrying and conveying coal; The impurity removal unit is arranged on the frame, located above the conveying cavity, and has an impurity removal bucket that is lifted, slidable and rotatable relative to the frame, and the impurity removal bucket rotates in a revolution mode; the impurity removal bucket is configured to slide downward into or upward out of the conveying cavity, so that: The impurity removal bucket enters the conveying cavity and is used to collect impurities; The impurity removal bucket leaves the conveying cavity and is used to carry away impurities.

[0005] For example, in a coal fine material screw conveying device provided in at least one embodiment of the present disclosure, the impurity removal unit further includes: A base column is arranged on the frame, located above the conveying cavity, and has a circularly arranged circulation track, and the debris removal bucket is slidably arranged in the circulation track; A lifting rail frame is rotatably arranged on the frame, the rotation center is the axis of the base column, and has a slide groove extending in the up-down direction; The sliding block is set in the sliding groove for lifting and sliding. The debris removal bucket is rotatably set on the sliding block, and the sliding block is used to drive the debris removal bucket to lift and slide.

[0006] For example, in a coal fine material spiral conveying device provided in at least one embodiment of the present disclosure, the circulating track includes a low flat section, an ascending section, a high flat section and a descending section that are continuously connected, and the ascending section and the descending section are used to cooperate with the slider to slide up and down along the slide groove.

[0007] For example, in a coal fine material screw conveying device provided in at least one embodiment of the present disclosure, the impurity removal unit further includes: A rotating gear is arranged on the debris removal bucket; A flat rack is arranged on the base column and located at the lower side of the high flat section. When the debris removal bucket slides along the high flat section, it meshes with the rotating gear and drives the debris removal bucket to rotate.

[0008] For example, in a coal fine material screw conveying device provided in at least one embodiment of the present disclosure, the impurity removal unit further includes: The inclined rack is arranged on the base column, located on the upper side of the ascending section and close to one end of the low flat section; it is configured to mesh with the rotating gear and drive the debris removing bucket to rotate when the debris removing bucket slides along the ascending section.

[0009] For example, in a coal fine material spiral conveying device provided in at least one embodiment of the present disclosure, the impurity removal bucket has a plurality of locking holes distributed in a circumference with the axis of rotation of the impurity removal bucket as the center; the impurity removal unit also includes: The locking rod is slidably disposed on the sliding block and is arranged to be inserted into one of the locking holes after sliding.

[0010] For example, in a coal fine material screw conveying device provided in at least one embodiment of the present disclosure, the locking rod has an unlocking section extending in a horizontal direction, and the impurity removal unit further includes: Two unlocking blocks are arranged on the base column, the first one is located on the upper side of the low flat section and close to one end of the rising section, and the second one is located on the upper side of the high flat section and close to one end of the rising section, and are configured so that when the locking rod follows the lifting rail frame to rotate around the base column, it will conflict with or cancel the conflict with the unlocking section, so that: When the unlocking block contacts the unlocking section, the locking rod is separated from the locking hole; When the unlocking block and the unlocking section cancel the interference, the locking rod is inserted into the locking hole.

[0011] For example, in a coal fine material screw conveying device provided in at least one embodiment of the present disclosure, the impurity removal unit further includes: The elastic member has one end acting on the sliding block and the other end acting on the locking rod, and is configured to push the locking rod to be inserted into the locking hole.

[0012] For example, in a coal fine material screw conveying device provided in at least one embodiment of the present disclosure, a swing arm for intercepting impurities is provided on the impurity removal bucket.

[0013] For example, in a coal fine material screw conveying device provided in at least one embodiment of the present disclosure, the screw conveying unit includes: A conveying pipeline, arranged on the frame, having the conveying cavity; A rotating shaft, rotatably disposed in the delivery cavity; The spiral pusher is arranged on the outer circumference of the rotating shaft and is distributed in a spiral shape, and is used to push the coal material with the help of the rotation of the rotating shaft.

[0014] The beneficial effects of the embodiments of the present disclosure are: In the present disclosure, in the actual working process, the coal enters the conveying cavity of the spiral conveying unit. During the conveying process, the impurity removal unit starts working according to the preset program or the instruction of the operator. The impurity removal bucket is driven to slide downward into the conveying cavity, and the rotating mechanism adjusts the height of the impurity removal bucket so that it can better collect impurities. The impurity removal bucket moves in the conveying cavity to collect impurities in the coal. After the collection is completed, the lifting mechanism lifts the impurity removal bucket upward, leaves the conveying cavity, and takes out the impurities.

[0015] Through the coordinated work of various components of the coal fine material screw conveying device, the problem of incomplete removal of impurities in the coal fine material is effectively solved, while reducing the circulation consumption of water and reducing the impact of impurities on subsequent coal processing and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments of the present disclosure. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on the contents of the exemplary embodiments of the present disclosure and these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present disclosure; Figure 2 for Figure 1 A partial enlarged view of A in the embodiment of the present invention; Figure 3for Figure 1 A schematic diagram of the structure of the base column and the heightened fence at the first viewing angle in the embodiment; Figure 4 for Figure 1 A schematic diagram of the structure of the base column and the heightened fence at a second viewing angle in the embodiment; Figure 5 for Figure 1 A schematic diagram of the structure of the joint between the debris removal bucket and the lifting rail frame in the embodiment; Figure 6 for Figure 1 A schematic diagram of the structure of the base column in the first viewing angle in the embodiment of the present invention; Figure 7 for Figure 1 A schematic diagram of the structure of the base column at a second viewing angle in the embodiment of the present invention; In the figure: 1, frame, 2, spiral conveying unit, 21, conveying pipeline, 211, conveying cavity, 22, rotating shaft, 23, spiral push piece, 3, impurity removal unit, 31, impurity removal bucket, 311, locking hole, 312, rocker arm, 32, base column, 321, circulating track, 3211, low flat section, 3212, rising section, 3213, high flat section, 3214, descending section, 33, lifting rail frame, 331, slide groove, 34, slider, 35, rotating gear, 36, flat rack, 37, inclined rack, 38, locking rod, 381, unlocking section, 382, ​​elastic member, 39, unlocking block. DETAILED DESCRIPTION

[0018] The present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0019] In order to simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0020] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0021] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0022] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0023] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] like Figure 1 to Figure 7 As shown, it shows a fine coal screw conveying device in one embodiment of the present disclosure. The fine coal screw conveying device is intended to effectively remove residual impurities and improve the quality of coal during the process of conveying fine coal. The device is mainly composed of a frame 1, a screw conveying unit 2 and an impurity removal unit 3, which work together to achieve the conveying and impurity removal functions of fine coal.

[0025] The frame 1 is the basic supporting structure of the entire device. Its structural shape is designed according to the actual use scenario and equipment layout, providing a solid support platform for other components to bear the weight of the screw conveying unit 2 and the impurity removal unit 3, and can withstand various forces generated during the operation of the equipment, such as the gravity of the coal, the friction during the screw conveying, and the impact force during the impurity removal process, etc., to improve the stability and reliability of the device during long-term operation. Anchor bolts or shock-absorbing pads can be installed at the bottom of the frame 1 to firmly fix the device on the ground and reduce vibration during operation. Provide a reliable basic guarantee for the transportation and impurity removal of fine coal.

[0026] The screw conveying unit 2 is arranged on the frame 1, and common screw conveying components can be selected, such as a screw shaft, a screw blade, a conveying pipe, and a driving device. The conveying pipe has a conveying cavity 211 for conveying coal. The coal is put into the conveying cavity 211 and conveyed to the destination area along the conveying cavity 211. The conveying cavity 211 is arranged at an angle with the ground as a whole, with one end high and the other end low. The coal enters from the low end and is discharged from the high end to realize the conveying of the coal; at the same time, a water inlet component and a heightened fence are added at the low end, so that a small pool is formed at the low end of the conveying cavity 211. Water is added through the water inlet component, and the water surface height is generally not higher than the height of the heightened fence. The coal is stirred by means of rotating spiral blades, and then the coal is cleaned, so that small particles or light impurities float to the water surface, and the impurities are selected to facilitate the next step of impurity cleaning. During operation, it is generally chosen to remove impurities floating on the water surface by opening an overflow port on the heightened fence. This method requires continuous water inflow and consumes a large amount of water resources. At the same time, the overflowing water containing impurities needs to be treated again, which is a complicated process with a large workload. This common impurity removal method is not selected in this example.

[0027] In this example, the added impurity removal unit 3 is arranged on the frame 1, above the conveying cavity 211, and in this example, above the small pool. It is mainly composed of an impurity removal bucket 31 and corresponding components with lifting and rotating functions. That is, the impurity removal bucket 31 can be lifted and slid up and down, and can also be rotated in a horizontal plane relative to the frame 1. The impurity removal bucket 31 includes a bottom plate and a vertical plate arranged at an angle, and the bottom plate and the vertical plate are L-shaped as a whole. There is a guard plate at each end of the bottom plate and the vertical plate. The overall shape is bucket-shaped, which is convenient for storing and shoveling impurities in the water; the bottom plate, the vertical plate and the guard plate are all provided with drainage grooves to facilitate the separation of water and impurities. External force is applied to drive the debris removal bucket 31 to rotate in the horizontal plane. When the debris removal bucket 31 rotates to the top of the small pool, external force is applied to drive the debris removal bucket 31 to slide downward for a distance and then stop sliding downward. At this time, the bottom plate of the debris removal bucket 31 is below the water surface. With the help of the continuously rotating debris removal bucket 31, the floating impurities on the water surface are collected; after the debris removal bucket 31 rotates a certain angle in the water, external force is applied to drive the debris removal bucket 31 to slide upward for a distance and then stop sliding upward. At this time, the height of the debris removal bucket 31 is higher than the height of the heightened fence. Height; then the impurity removing bucket 31 continues to rotate for a certain angle until the impurity removing bucket 31 leaves the top of the conveying cavity 211, and then the impurities in the impurity removing bucket 31 are cleaned up, and external force is applied to drive the impurity removing bucket 31 to continue to rotate to the top of the water pool, and the above operation process is repeated again to achieve continuous cleaning of impurities. In the process, the impurity removing bucket 31 is combined with the method of descending and then rising in the process of rotating in the horizontal plane to achieve coal material impurities, while reducing water consumption and discharge, avoiding secondary treatment of overflow water, and improving impurity removal efficiency.

[0028] In the actual working process, the coal enters the conveying cavity 211 of the spiral conveying unit 2. During the conveying process, the impurity removal unit 3 starts working according to the preset program or the operator's instructions. The impurity removal bucket 31 is driven to slide downward into the conveying cavity 211, and the rotating mechanism adjusts the height of the impurity removal bucket 31 so that it can better collect impurities. The impurity removal bucket 31 moves in the conveying cavity 211 to collect impurities in the coal. After the collection is completed, the lifting mechanism lifts the impurity removal bucket 31 upward, leaving the conveying cavity 211, and takes out the impurities.

[0029] Through the coordinated work of various components of the coal fine material screw conveying device, the problem of incomplete removal of impurities in the coal fine material is effectively solved, while reducing the circulation consumption of water and reducing the impact of impurities on subsequent coal processing and use.

[0030] In some examples, the structure of the impurity removal unit 3 is refined, and the impurity removal unit 3 includes a base column 32, a lifting rail frame 33, a slider 34, an inclined rack 37, a rotating gear 35, a horizontal rack 36, a locking rod 38, two unlocking blocks 39 and an elastic member 382; For example, Figure 1 to Figure 7 As shown, the base column 32 is arranged on the frame 1 and above the conveying cavity 211, and has a circularly arranged circulating track 321. The circulating track 321 is composed of a continuously connected low flat section 3211, an ascending section 3212, a high flat section 3213 and a descending section 3214, and the debris removal bucket 31 slides in the track. The debris removal bucket 31 can work cyclically and continuously remove debris.

[0031] The lifting rail frame 33 is centered on the base column 32 and is installed on the frame 1 through a large slewing bearing. The lifting rail frame 33 has a slide groove 331 extending in the up-down direction to provide a lifting track for the slider 34. The slider 34 slides up and down in the slide groove 331, and is connected to the debris removal bucket 31 through the locking rod 38, driving the debris removal bucket 31 to move up and down.

[0032] A linear bearing is installed between the slider 34 and the slide groove 331 to reduce friction and ensure smooth lifting. The inclined rack 37 is installed on the upper side of the ascending section 3212 of the base column 32, and a rotating gear 35 is provided on the debris removal bucket 31. When the debris removal bucket 31 slides along the ascending section 3212, the rotating gear 35 meshes with the inclined rack 37, driving the debris removal bucket 31 to rotate, so that the debris removal bucket 31 changes its angle during the lifting process, and prevents impurities from falling from the debris removal bucket 31.

[0033] The horizontal rack 36 is installed on the lower side of the high flat section 3213 of the base column 32. When the debris removing bucket 31 slides along the high flat section 3213, the horizontal rack 36 engages with the rotating gear 35, driving the debris removing bucket 31 to rotate, thereby changing the direction of the debris removing bucket 31 and making the impurities in the debris removing bucket 31 slide out automatically, reducing the manual cleaning process.

[0034] The locking hole 311 and the locking rod 38, in this example, the number of the locking holes 311 is preferably two, which are distributed at intervals in a circle with the rotation axis of the debris removal bucket 31 as the center. The locking rod 38 is slidably set on the slider 34 through a guide sleeve, and can be inserted into the locking hole 311 to fix the rotation angle of the debris removal bucket 31.

[0035] Two unlocking blocks 39 are installed on the upper side of the low flat section 3211 of the base column 32 near the upper side of the rising section 3212 and the high flat section 3213 near the upper side of the rising section 3212; the lock rod 38 has a horizontally extending unlocking section 381. When the lock rod 38 rotates with the lifting rail frame 33 to collide with the unlocking block 39, the unlocking block 39 pushes the lock rod 38 upward to separate the lock rod 38 from the locking hole 311; when the lock rod 38 and the unlocking block 39 are no longer in conflict, under the action of the elastic member 382, ​​the lock rod 38 is inserted into the locking hole 311 to fix the rotation angle of the debris removal bucket 31.

[0036] The elastic member 382 can be a spring in the prior art, one end of which is connected to the slider 34, and the other end is connected to the locking rod 38. Under normal circumstances, the locking rod 38 is pushed into the locking hole 311 by the force generated by the contraction and pulling of the elastic member 382, ​​thereby ensuring that the angle of the debris removal bucket 31 is stable during operation. Only when the locking rod 38 conflicts with the unlocking block 39 can the locking rod 38 be separated from the locking hole 311, thereby adjusting the angle of the debris removal bucket 31.

[0037] When working, the debris removal bucket 31 slides in the circulating track 321 of the base column 32, and is lifted and lowered by the lifting rail frame 33 and the slider 34. With the help of the rotating lifting rail frame 33, the debris removal bucket 31 is driven from the high flat section 3213 to the descending section 3214. At this time, the vertical plate is set at an angle with the horizontal plane, and the height of the vertical plate is higher than the bottom plate. The locking rod 38 is aligned with the corresponding first locking hole 311. With the force provided by the elastic member 382, ​​the locking rod 38 is inserted into the first locking hole 311. The debris removal bucket 31 maintains this angle and enters the water along the descending section 3214, and then slides to the low flat section 3211. With the help of the rotating lifting rail frame 33, the debris removal bucket 31 is rotated along the horizontal plane to collect impurities on the water surface.

[0038] When the debris removing bucket 31 is about to slide to the rising section 3212, the unlocking section 381 is squeezed and contacted with the first unlocking block 39. With the help of the squeezing of the first unlocking block 39, the locking rod 38 is separated from the corresponding first locking hole 311. At this time, the rotating gear 35 is engaged with the inclined rack 37. With the help of the inclined rack 37, the debris removing bucket 31 is rotated. The rotation direction at this time is defined as reverse. As the debris removing bucket 31 rotates, the bottom plate height is finally higher than the vertical plate, and the impurities are gathered to the center position of the debris removing bucket 31; when the rotating gear 35 is separated from the inclined rack 37, the locking rod 38 is aligned with the corresponding second locking hole 311. With the force provided by the elastic member 382, ​​the locking rod 38 is inserted into the second locking hole 311, and the debris removing bucket 31 maintains this angle and leaves the water surface along the rising section 3212; it continues to slide along the rising section 3212 until the debris removing bucket 31 enters the high flat section 3213.

[0039] Then the unlocking section 381 is squeezed and contacted with the second unlocking block 39. With the help of the squeezing of the second unlocking block 39, the locking rod 38 is separated from the corresponding second locking hole 311. At this time, the rotating gear 35 is meshed with the horizontal rack 36. With the help of the horizontal rack 36, the debris removal bucket 31 is rotated. After rotating a certain angle, it stops rotating. The rotation direction at this time is defined as the positive direction. Finally, the bottom plate is set at an angle with the horizontal plane, which facilitates the automatic drop of impurities from the debris removal bucket 31, completes the separation of impurities from the debris removal bucket 31 and the collection of impurities, reduces the amount of manual work, and realizes continuous automatic operation. At the same time, it is prepared for the next step of the debris removal bucket 31 entering the water. Continuous operation is realized.

[0040] Through the coordination of the various components of the impurity removal unit 3, the impurity removal bucket 31 is able to circulate, lift, rotate and lock its angle above the conveying chamber 211, thereby achieving continuous operation. At the same time, the impurities are captured from the water, separated from the impurity removal bucket 31 and collected, replacing the method of removing impurities by overflow water, thereby reducing water consumption and the secondary treatment process of water.

[0041] In some examples, the structure of the debris removal bucket 31 is refined, such as Figure 1~Figure 2 and Figure 5 As shown, a swing rod 312 is added. The swing rod 312 is used to intercept the impurities in the impurity removal bucket 31 to prevent the impurities from falling from the impurity removal bucket 31 when the water is discharged.

[0042] In some examples, the structure of the screw conveying unit 2 is refined. Figure 1 As shown, the spiral conveying unit 2 includes a conveying pipeline 21, a rotating shaft 22 and a spiral push piece 23; The conveying pipe 21 surrounds the rotating shaft 22 and the outer side of the spiral push piece 23 to form a conveying cavity 211 for carrying and conveying coal. The inner wall of the conveying pipe 21 is smoothed to reduce the friction of the coal during the conveying process and improve the wear resistance of the conveying pipe. The driving device of the rotating shaft 22 is a combination of components such as a motor, a reducer and a coupling commonly used in the prior art. The spiral conveying unit 2 is used to realize the axial conveyance of coal along the conveying pipe 21.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, which should be included in the scope of the claims of the present disclosure.

Claims

1. A coal fine material screw conveyor, characterized in that: include: Rack(1); A screw conveying unit (2) is arranged on the frame (1) and has a conveying cavity (211) for carrying and conveying coal; The impurity removal unit (3) is arranged on the frame (1) and located above the conveying cavity (211), and comprises an impurity removal bucket (31) which is arranged to be lifted, slidable and rotatable relative to the frame (1), and the impurity removal bucket (31) rotates in a revolution mode; the impurity removal bucket (31) is configured to slide downward into or upward out of the conveying cavity (211), so that: The impurity removal bucket (31) enters the conveying cavity (211) and is used to collect impurities; The impurity removal bucket (31) leaves the conveying cavity (211) and is used to remove impurities.

2. A coal fine material screw conveying device according to claim 1, characterized in that: The impurity removal unit (3) further comprises: A base column (32) is arranged on the frame (1) and is located above the conveying cavity (211), and has a circulating track (321) arranged in a ring shape, and the debris removal bucket (31) is slidably arranged in the circulating track (321); A lifting rail frame (33) is rotatably mounted on the frame (1), with the center of rotation being the axis of the base column (32), and having a slide groove (331) extending in the up-down direction; The slider (34) is arranged in the slide groove (331) to be lifted and slidable, the debris removal bucket (31) is rotatably arranged on the slider (34), and the slider (34) is used to drive the debris removal bucket (31) to be lifted and slidable.

3. A coal fine material screw conveying device according to claim 2, characterized in that: The circulating track (321) comprises a continuously connected low flat section (3211), an ascending section (3212), a high flat section (3213) and a descending section (3214); the ascending section (3212) and the descending section (3214) are used to cooperate with the sliding block (34) to slide up and down along the sliding groove (331).

4. The coal fine material screw conveying device according to claim 3, characterized in that: The impurity removal unit (3) further comprises: A rotating gear (35) is arranged on the debris removal bucket (31); A horizontal rack (36) is disposed on the base column (32) and is located at the lower side of the high flat section (3213). When the debris removal bucket (31) slides along the high flat section (3213), it meshes with the rotating gear (35) and drives the debris removal bucket (31) to rotate.

5. The coal fine material screw conveying device according to claim 4, characterized in that: The impurity removal unit (3) further comprises: An inclined rack (37) is disposed on the base column (32), located on the upper side of the ascending section (3212) and close to one end of the low flat section (3211); and is configured to mesh with the rotating gear (35) and drive the debris removing bucket (31) to rotate when the debris removing bucket (31) slides along the ascending section (3212).

6. The coal fine material screw conveying device according to claim 5, characterized in that: The impurity removal bucket (31) has a plurality of locking holes (311) distributed in a circumferential manner, with the axis of rotation of the impurity removal bucket (31) as the center; the impurity removal unit (3) further comprises: A locking rod (38) is slidably disposed on the slider (34) and is arranged to be inserted into one of the locking holes (311) after sliding.

7. The coal fine material screw conveying device according to claim 6, characterized in that: The locking rod (38) has an unlocking section (381) extending in a horizontal direction, and the impurity removal unit (3) further comprises: Two unlocking blocks (39) are arranged on the base column (32), the first one is located on the upper side of the low flat section (3211) and close to one end of the rising section (3212), and the second one is located on the upper side of the high flat section (3213) and close to one end of the rising section (3212). The two unlocking blocks (39) are arranged so that when the locking rod (38) follows the lifting rail frame (33) to rotate around the base column (32), the locking rod (38) contacts or cancels the contact with the unlocking section (381), so that: When the unlocking block (39) contacts the unlocking section (381), the locking rod (38) is separated from the locking hole (311); When the unlocking block (39) and the unlocking section (381) are no longer in conflict, the locking rod (38) is inserted into the locking hole (311).

8. The coal fine material screw conveying device according to claim 6, characterized in that: The impurity removal unit (3) further comprises: The elastic member (382) has one end acting on the slider (34) and the other end acting on the locking rod (38), and is configured to push the locking rod (38) to be inserted into the locking hole (311).

9. The coal fine material screw conveying device according to claim 1, characterized in that: The impurity removal bucket (31) is provided with a swing rod (312) for intercepting impurities.

10. The coal fine material screw conveying device according to claim 1, characterized in that: The spiral conveying unit (2) comprises: A conveying pipeline (21), arranged on the frame (1), having the conveying cavity (211); A rotating shaft (22) rotatably disposed in the delivery cavity (211); The spiral pusher (23) is arranged on the outer circumference of the rotating shaft (22) and is distributed in a spiral shape, and is used to push the coal material by means of the rotation of the rotating shaft (22).

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