Coal screening device

Abstract

The application discloses a coal screening device, relates to the technical field of coal screening, and comprises a pulverized coal bin, a filtering unit, a sealing cover and a bin door. The filtering unit comprises a rotating column, a trigger rod, a stabilizing spring, an extension column, a swing seat and a screen. The application can timely feedback whether the pulverized coal is accumulated, avoids the personnel's irregular inspection work, reduces the inspection frequency, can expand the cleaning range, can disassemble the filter screens at all places and can clean the filter screens in detail. In addition, the two states of the pulverized coal impact and the pulverized coal accumulation exerting pressure on the swing seat are mechanically isolated, the false report is prevented, the pulverized coal impact state is avoided to produce more serious accumulation, and the risk of being burned during cleaning in the state is reduced.

Description

Technical Field

[0001] This invention relates to the field of coal screening technology, and in particular to a coal screening device. Background Technology

[0002] In traditional 165MW unit boilers, a medium-storage pulverizing system is used. Currently, the coal powder screen in the pulverizing system, which connects the fine powder separator to the powder silo, is fixed between one or two airlocks at the top of the powder silo. An inspection hole is opened at the top of the silo where the coal powder screen is located. When the coal powder is mixed with debris such as rags, woven bags, dry grass, and plastic bags, it will cause the coal powder to accumulate on the screen, affecting the feeding or directly blocking the feeding port. At this time, it is necessary to manually reach inside to clean the debris.

[0003] The small inspection holes in the storage compartment make cleaning difficult for personnel. Secondly, limited hand movement prevents thorough cleaning of the coal powder screen. Thirdly, the accumulated coal powder is hot, increasing the risk of burns during cleaning. Finally, the unpredictable timing of accumulation necessitates frequent inspections to prevent blockages. Therefore, a coal screening device is needed to address these issues. Summary of the Invention

[0004] In view of the problems existing in the above or prior art, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a coal screening device that can solve the problem of debris blockage in the pulverizing system, as well as the problem of difficulty and limited space for personnel to clean debris, and the risk of burns. In addition, it also solves the problem of high-frequency inspection needs of personnel.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a coal screening device, which includes a coal powder bin, including a bin body, a sealing cover disposed on the top of the bin body, and a bin door disposed in the side wall of the bin body;

[0007] The filtration unit includes a rotating column disposed through the center of the sealing cover, a trigger rod disposed through the center of the rotating column, a stabilizing spring disposed on the body of the trigger rod, a plurality of telescopic columns disposed around the rotating column, a plurality of swing seats disposed around the bottom of the rotating column, and a screen disposed below the swing seats.

[0008] The material dispensing unit includes a support frame disposed on the upper end of the sealing cover, a material dispensing plate disposed through the center of the support frame, a lever disposed on one side of the material dispensing plate, and a sealing tube disposed on one side of the trigger lever.

[0009] The warning unit includes a laser sensor located on the top of the trigger lever and several indicator lights located around the top of the trigger lever.

[0010] As a preferred embodiment of the coal screening device of the present invention, the bin body includes an arc-shaped wall, a conical wall disposed at the bottom of the arc-shaped wall, an annular receiving groove disposed inside the arc-shaped wall, a cleaning port disposed through one side of the arc-shaped wall, and a discharge port disposed at the bottom of the conical wall.

[0011] The sealing cap includes a feed inlet disposed on one side of its top, and a first waist-shaped opening disposed on the side wall of the feed inlet;

[0012] The compartment door is located within the annular receiving groove.

[0013] As a preferred embodiment of the coal screening device of the present invention, the rotating column includes a spherical seat disposed at its bottom, a plurality of first dovetail strips disposed on the outer wall of the spherical seat, a cutting surface disposed at the bottom of the spherical seat, a cavity disposed inside the rotating column, and a handle disposed on the column body of the rotating column.

[0014] In a preferred embodiment of the coal screening device of the present invention, the trigger rod includes a support plate disposed below the rod body and a second waist-shaped opening disposed on the upper outer wall of the trigger rod.

[0015] In a preferred embodiment of the coal screening device of the present invention, the lower inner wall of the first waist-shaped opening is misaligned with the lower inner wall of the second waist-shaped opening.

[0016] In a preferred embodiment of the coal screening device of the present invention, the telescopic column includes a piston cylinder hinged to the outer wall of the rotating column, a piston rod hinged to the upper surface of the swing seat, and a return spring disposed inside the piston cylinder.

[0017] As a preferred embodiment of the coal screening device of the present invention, the swing seat includes a petal-shaped spherical wall disposed at one end thereof, a first dovetail groove disposed on the inner wall of the petal-shaped spherical wall, a second dovetail groove disposed at the bottom of the swing seat, and lifting surfaces disposed on both sides of the first dovetail groove.

[0018] In a preferred embodiment of the coal screening device of the present invention, the screen includes a second dovetail bar disposed in the middle and baffle plates disposed on both sides of the screen; the screen is fan-shaped.

[0019] In a preferred embodiment of the coal screening device of the present invention, the material distribution plate includes an umbrella-shaped plate disposed on its top and a straight rod disposed at the bottom of the umbrella-shaped plate.

[0020] The beneficial effects of this invention are as follows: This invention can provide timely feedback on whether coal dust has accumulated, avoiding the need for unscheduled inspections and reducing the frequency of inspections. It can also expand the cleaning range and disassemble and thoroughly clean the filters at various locations. In addition, it mechanically isolates the two states of coal dust impact and coal dust accumulation exerting pressure on the swing seat, preventing false alarms and avoiding more severe accumulation under the coal dust impact state, thus reducing the risk of burns during cleaning under this state. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional overall structural diagram of the present invention.

[0023] Figure 2 This is a top view of the present invention after the chamber body has been removed.

[0024] Figure 3 For the present invention Figure 2 AA full sectional view.

[0025] Figure 4 For the present invention Figure 3 A magnified view of a portion of the image.

[0026] Figure 5 This is a partial exploded view of the filter unit of the present invention.

[0027] In the diagram: 100, Pulverized Coal Bin; 101, Bin Body; 102, Sealing Cover; 103, Bin Door; 200, Filter Unit; 201, Rotating Column; 202, Trigger Rod; 203, Stabilizing Spring; 204, Telescopic Column; 205, Swinging Seat; 206, Screen; 300, Distributing Unit; 301, Support Frame; 302, Distributing Plate; 303, Toggle Rod; 304, Sealing Tube; 400, Warning Unit; 401, Laser Sensor; 402, Indicator Light; 101a, Arc-shaped Wall; 101b, Conical Wall; 101c, Annular Receiving Groove; 101d, Cleaning Port; 101 e. Discharge port; 102a. Feed port; 102b. First waist-shaped opening; 201a. Spherical seat; 201b. First dovetail strip; 201c. Cutting surface; 201d. Chamber; 201e. Handle; 202a. Support plate; 202b. Second waist-shaped opening; 204a. Piston cylinder; 204b. Piston rod; 204c. Return spring; 205a. Petal-shaped spherical wall; 205b. First dovetail groove; 205c. Second dovetail groove; 205d. Lifting surface; 206a. Second dovetail strip; 206b. Baffle plate; 302a. Umbrella-shaped plate; 302b. Straight rod. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0031] Example 1

[0032] Reference Figures 1-5 This is the first embodiment of the present invention. This embodiment provides a coal screening device, which includes a coal powder silo 100, including a silo body 101, a sealing cover 102 disposed on the top of the silo body 101, and a silo door 103 disposed in the side wall of the silo body 101.

[0033] The filter unit 200 includes a rotating column 201 disposed through the center of the sealing cover 102, a trigger rod 202 disposed through the center of the rotating column 201, a stabilizing spring 203 disposed on the body of the trigger rod 202, a plurality of telescopic columns 204 disposed around the rotating column 201, a plurality of swing seats 205 disposed around the bottom of the rotating column 201, and a screen 206 disposed below the swing seats 205;

[0034] The material dispensing unit 300 includes a support frame 301 disposed on the upper end of the sealing cover 102, a material dispensing plate 302 disposed through the center of the support frame 301, a lever 303 disposed on one side of the material dispensing plate 302, and a sealing tube 304 disposed on one side of the trigger lever 202.

[0035] The warning unit 400 includes a laser sensor 401 disposed on the top of the trigger lever 202, and several indicator lights 402 disposed around the top of the trigger lever 202.

[0036] Furthermore, the silo body 101 includes an arc-shaped wall 101a, a conical wall 101b disposed at the bottom of the arc-shaped wall 101a, an annular receiving groove 101c disposed inside the arc-shaped wall 101a, a cleaning port 101d disposed through one side of the arc-shaped wall 101a, and a discharge port 101e disposed at the bottom of the conical wall 101b.

[0037] The sealing cap 102 includes a feed inlet 102a disposed on one side of its top, and a first waist-shaped opening 102b disposed on the side wall of the feed inlet 102a;

[0038] The door 103 is located inside the annular receiving groove 101c.

[0039] Furthermore, the rotating column 201 includes a spherical seat 201a disposed at its bottom, a plurality of first dovetail strips 201b disposed on the outer wall of the spherical seat 201a, a cut surface 201c disposed at the bottom of the spherical seat 201a, a chamber 201d disposed inside the rotating column 201, and a handle 201e disposed on the column body of the rotating column 201.

[0040] Furthermore, the trigger lever 202 includes a support piece 202a disposed below the lever body, and a second waist-shaped opening 202b disposed on the upper outer wall of the trigger lever 202.

[0041] Furthermore, the lower inner wall of the first waist-shaped opening 102b is misaligned with the lower inner wall of the second waist-shaped opening 202b.

[0042] Furthermore, the telescopic column 204 includes a piston cylinder 204a hinged to the outer wall of the rotating column 201, a piston rod 204b hinged to the upper surface of the swing seat 205, and a return spring 204c disposed inside the piston cylinder 204a.

[0043] Furthermore, the swing seat 205 includes a petal-shaped spherical wall 205a disposed at one end thereof, a first dovetail groove 205b disposed on the inner wall of the petal-shaped spherical wall 205a, a second dovetail groove 205c disposed at the bottom of the swing seat 205, and lifting surfaces 205d disposed on both sides of the first dovetail groove 205b.

[0044] Furthermore, the screen 206 includes a second dovetail strip 206a disposed in the middle, and baffle plates 206b disposed on both sides of the screen 206; the screen 206 is fan-shaped.

[0045] Furthermore, the material distribution plate 302 includes an umbrella-shaped plate 302a disposed on its top and a straight rod 302b disposed at the bottom of the umbrella-shaped plate 302a.

[0046] It should be noted that the pulverized coal silo 100 is generally inverted conical in shape. The silo body 101 consists of an upper arc-shaped wall 101a and a lower conical wall 101b. The arc-shaped wall 101a has a circular arc cross-section and only one sphere center. The conical wall 101b is fixed to the lower end face of the arc-shaped wall 101a and is used for collecting the pulverized coal after filtration. The pulverized coal is then discharged from the discharge port 101e below the conical wall 101b to the next process. A cleaning port 101d is provided on the side of the arc-shaped wall 101a. The cleaning port 101d is a regular strip shape. In addition, a hollow annular receiving groove 101c is provided inside the arc-shaped wall 101a. The annular receiving groove 101c can perfectly accommodate the door 103, allowing the door 103 to rotate circumferentially along the annular receiving groove 101c. Since the door 103 is fixed with a handle, the door 103 can only move within the range of the cleaning port 101d. To ensure airtightness, the length of the door 103 must be greater than the length of the cleaning port 101d. Therefore, personnel can open and close the compartment 101 by pushing and pulling the door 103.

[0047] Preferably, the sealing cover 102 is fixed to the upper end face of the silo body 101 by bolts. A cylindrical feed inlet 102a is also fixed to the top surface of the sealing cover 102 for feeding coal powder. In addition, a channel-shaped first oblong opening 102b is fixed to the side wall of the feed inlet 102a pointing towards the axis of the sealing cover 102. It should be noted that the feed inlet 102a and the sealing cover 102 are not concentric. Furthermore, when installing the sealing cover 102, the feed inlet 102a needs to be far away from the silo door 103 to prevent coal powder from accidentally falling onto the silo door 103 during cleaning operations, which could cause burns to personnel.

[0048] Preferably, the rotating column 201 extends from the top through the center of the sealing cover 102. A handle 201e is fixed at the top of the rotating column 201, allowing the operator to adjust the rotation angle of the rotating column 201 by rotating the handle 201e. Furthermore, the handle 201e allows the rotating column 201 to be suspended on the sealing cover 102, thus positioning the rotating column 201. It should be noted that at the contact point between the rotating column 201 and the sealing cover 102, a limiting structure consisting of an annular strip and an annular groove is provided to ensure that the rotating column 201 does not detach from the sealing cover 102.

[0049] A spherical seat 201a is fixed to the bottom of the rotating column 201. The spherical seat 201a has a spherical inner cavity. In addition, a cut surface 201c is fixed to the bottom of the spherical seat 201a, making the spherical seat 201a have a bottle-shaped structure, which can leave room for the movement of the swing seat 205. Several first dovetail strips 201b are also fixed to the outer wall of the spherical seat 201a in a circumferential direction. In this embodiment, there are four. The first dovetail strips 201b extend from top to bottom along the outer wall of the spherical seat 201a. The petal-shaped spherical wall 205a fixed to the end of the swing seat 205 also has a first dovetail groove 205b of the same shape and size that runs through from top to bottom on its inner wall. Therefore, the first dovetail strips 201b and the first dovetail grooves 205b can cooperate with each other, so that the swing seat 205 can swing circumferentially along the extension direction of the first dovetail strips 201b.

[0050] Preferably, the center of the spherical seat 201a coincides with the center of the arc-shaped wall 101a.

[0051] The rotating column 201 itself is a cylindrical structure with an internal cavity, which is connected to the spherical internal cavity in the spherical seat 201a and forms the chamber 201d.

[0052] Preferably, the trigger rod 202 is a columnar structure with a weight-reducing cavity inside. A support plate 202a is fixed on the outer wall of the trigger rod 202 adjacent to the bottom end. The support plate 202a is located inside the spherical seat 201a. A channel-shaped second waist-shaped opening 202b is fixed on the outer wall of the trigger rod 202 adjacent to the top end.

[0053] Preferably, the second waist-shaped opening 202b points to the first waist-shaped opening 102b. The outer wall shape of the second waist-shaped opening 202b and the first waist-shaped opening 102b are consistent, but the bottom of the inner wall is not at the same height. Specifically, the bottom of the inner wall of the second waist-shaped opening 202b is higher than the bottom of the inner wall of the first waist-shaped opening 102b.

[0054] Preferably, the stabilizing spring 203 is sleeved on the rod of the trigger rod 202, below the support plate 202a, and the other end of the stabilizing spring 203 contacts the bottom of the inner cavity of the ball seat 201a, so that the trigger rod 202 is supported by the stabilizing spring 203, is in an almost suspended state and does not push against the upper end of the inner cavity of the ball seat 201a.

[0055] Preferably, the swing seat 205 is rod-shaped, with the same number as the first dovetail strips 201b, extending radially along the arc-shaped wall 101a. Therefore, the outer end of the swing seat 205 is attached to the arc-shaped wall 101a, while the other end is fixedly connected to the petal-shaped spherical wall 205a. The inner wall of the petal-shaped spherical wall 205a is attached to the outer wall of the spherical seat 201a, and the two sidewalls of each petal-shaped spherical wall 205a are in contact with each other. Therefore, the swing seat 205 can swing up and down. It should be noted that when the swing seat 205 swings downwards, its outer end is limited by the joint between the arc-shaped walls 101a, i.e., the travel limit.

[0056] Furthermore, when the crossbar sections of each swing seat 205 are simultaneously horizontal, the lower part of the inner wall of the petal-shaped spherical wall 205a is exactly below the cut surface 201c of the spherical seat 201a. The lower part of the inner wall of the petal-shaped spherical wall 205a protrudes outwards relative to the inner wall of the spherical shape, forming an arc-shaped lifting surface 205d. It should be noted that the bottom of the petal-shaped spherical wall 205a is rounded, basically consistent with the bottom end face of the trigger rod 202, and the outer extension of the bottom end face of the trigger rod 202 is also rounded.

[0057] A second dovetail groove 205c extending outward is provided below the crossbar of the swing seat 205, and a second dovetail strip 206a is fixed on the upper end face of the screen 206, which can cooperate with the second dovetail groove 205c, so that the screen 206 can move along the axial direction of the second dovetail strip 206a. Therefore, the screen 206 can be removed or installed from the swing seat 205.

[0058] Preferably, to ensure that the swing seat 205 and the screen 206 are in a horizontal position, a telescopic column 204 is hinged between the upper surface of the crossbar of the swing seat 205 and the side wall of the rotating column 201, which can lift the swing seat 205. The number of telescopic columns 204 is the same as that of the swing seat 205. Specifically, the sealing end of the piston cylinder 204a is hinged to the side wall of the rotating column 201, the piston rod 204b is sleeved inside the piston cylinder 204a, the bottom of the piston is in contact with the sealing end of the piston cylinder 204a, and the other end of the piston rod 204b is hinged to the upper surface of the crossbar of the swing seat 205. In addition, a return spring 204c is sleeved on the rod of the piston rod 204b, and its two ends are fixed to the piston surface and the open end of the piston cylinder 204a, respectively. When the swing seat 205 moves downward under load, it needs to overcome the elastic force of the return spring 204c to pull the piston rod 204b outward. When the swing seat 205 moves upward, the return spring 204c returns to its original position, pushing the piston rod 204b and pulling the swing seat 205 up. It should be noted that because the bottom of the piston is in contact with the sealing end of the piston cylinder 204a, when the swing seat 205 swings upward, it reaches its stroke limit when it reaches the horizontal position.

[0059] Preferably, the screen 206 is fan-shaped, with its inward side fitting against the outer wall of the petal-shaped spherical wall 205a to ensure sealing, while its outward side fitting against the inner wall of the arc-shaped wall 101a. The two side walls of each screen 206 are also in contact with each other. When coal dust contains debris such as rags, woven bags, hay, or plastic bags, it will accumulate on the screen, causing the swing seat 205 to swing downwards under load. Baffle plates 206b are fixed downwards on the two side walls of the screen 206. When one of the swing seats 205 swings downwards under load, the screen 206 at that point will misalign with the other screens 206, creating a leak. This allows coal dust and debris to escape, severely impacting subsequent processes. Therefore, the baffle plates 206b on both sides of the unswinging screen 206 can block the leak and prevent such events from occurring. The sealing surface of the baffle plate 206b should be slightly larger than the fan-shaped void. The specific shape can be determined according to the requirements or actual situation and is not limited.

[0060] Preferably, a support frame 301 is fixed on the inner wall of the feed inlet 102a on the sealing cover 102. The support frame 301 has at least one support leg. A distribution plate 302 passes through the support frame 301 at the axial position of the feed inlet 102a. The distribution plate 302 is composed of an umbrella-shaped plate 302a at the top and a straight rod 302b at the bottom. The straight rod 302b can move along the axial direction of the feed inlet 102a. A lever 303 is fixed on the side wall of the straight rod 302b. 03 extends from the first waist-shaped opening 102b and ends at the bottom of the inner wall of the second waist-shaped opening 202b, that is, the outermost end of the lever 303 rests at the bottom of the inner wall of the second waist-shaped opening 202b, so that the entire material distribution plate 302 is in a suspended state. In order to ensure the slight negative pressure state of the entire device, a sealing tube 304 is sleeved on the outer wall of the first waist-shaped opening 102b and the second waist-shaped opening 202b. In this embodiment, a corrugated tube is used to facilitate the movement of the trigger rod 202 while ensuring airtightness.

[0061] Preferably, a laser sensor 401 is provided at the top of the trigger rod 202. In this embodiment, a laser displacement sensor is used to monitor a certain degree of positional change in the trigger rod 202. When a displacement exceeding a displacement threshold is detected, the indicator light 402 around the top of the trigger rod 202 illuminates, thus alerting the operator to the presence of coal dust accumulation. The indicator light 402 can be an LED light or a laser indicator. It should be noted that the light alert only occurs when the trigger rod 202 moves upwards.

[0062] When in use, the coal powder first arrives at the feed inlet 102a and passes through the distribution plate 302. At this time, the coal powder will be diverted by the umbrella-shaped plate 302a and spread around, improving the filtration efficiency. The umbrella-shaped plate 302a will be affected by the impact of the coal powder, causing the distribution plate 302 to move downward, which in turn drives the trigger rod 202 to move downward through the lever 303.

[0063] Then, the bottom surface of the trigger rod 202 passes over the bottom of the petal-shaped spherical wall 205a, causing the bottom of the petal-shaped spherical wall 205a to abut against the body of the trigger rod 202. At this time, the impact of the falling coal powder will not cause the swing seat 205 to be subjected to the impact and swing downward. Otherwise, if the downward process of the trigger rod 202 is not considered, the swing seat 205 will be subjected to the impact and swing downward when the coal powder falls. Subsequently, the outer edge of the bottom of the trigger rod 202 will be squeezed and pushed up by the lifting surface 205d, causing a false alarm. In addition, it will also cause the coal powder accumulated on the screen 206 at this point to be far greater than the accumulation amount of the screen 206 in the horizontal state, which is more likely to cause coal powder blockage. During cleaning, a large amount of coal powder may even gush out from the cleaning port 101d.

[0064] When the coal powder input process ends, the distribution plate 302 is no longer impacted, the stabilizing spring 203 returns to its original state from compression, and pushes the trigger rod 202 back to its initial position. If there is no coal powder accumulation during this input, there is no need to clean out the debris; if the coal powder accumulates on the screen 206, when the trigger rod 202 is pushed back to its initial position, the swing seat 205 swings down under the weight of the accumulated coal powder, the telescopic column 204 is also pulled open by the swing seat 205, the bottom of the trigger rod 202 is then squeezed by the bottom of the petal-shaped spherical wall 205a, the lifting surface 205d lifts the telescopic column 204, and finally the indicator light 402 provides a light reminder.

[0065] Then, the operator rotates the handle 201e, causing the rotating column 201 to rotate the screen 206 at the powder drop point to the bin door 103, and then pushes open the bin door 103 to clean up the accumulated coal powder and remove debris. During this process, the operator will not be burned by coal powder that accidentally falls from the feed inlet 102a, and the coal powder and debris will not leak out and escape.

[0066] After cleaning, the telescopic column 204 pulls the swing seat 205 back, at which point the screen 206 can be removed for more thorough cleaning. The petal-shaped spherical wall 205a no longer presses against the trigger rod 202, and the trigger rod 202 falls back onto the stabilizing spring 203 under its own weight. The material distribution plate 302 also resets, and the indicator light 402 turns off. At this time, the other screens 206 are facing the feed inlet 102a, awaiting the next cleaning.

[0067] In summary, this design can promptly report whether coal dust has accumulated, avoiding the need for unscheduled inspections and reducing the frequency of inspections. It also expands the cleaning range and allows for the disassembly and thorough cleaning of various filters. Furthermore, it mechanically isolates the two states of coal dust impact and coal dust accumulation exerting pressure on the swing seat, preventing false alarms and avoiding more severe accumulation under coal dust impact conditions, thus reducing the risk of burns during cleaning under these conditions.

[0068] Importantly, the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A coal material sizing apparatus, characterised in that: The utility model relates to a coal screening device, which comprises a coal bin (100), a filtering unit (200), a distributing unit (300) and a warning unit (400). The coal bin (100) comprises a bin body (101), a sealing cover (102) arranged on the top of the bin body (101), and a bin door (103) arranged in the sidewall of the bin body (101). The filtering unit (200) comprises a rotating column (201) arranged through the center of the sealing cover (102), a trigger rod (202) arranged through the center of the rotating column (201), a stabilizing spring (203) arranged on the rod body of the trigger rod (202), a plurality of telescopic columns (204) arranged around the rotating column (201), a plurality of swing seats (205) arranged around the bottom of the rotating column (201), and a screen (206) arranged below the swing seats (205). The distributing unit (300) comprises a support frame (301) arranged on the upper end of the sealing cover (102), a distributing disc (302) arranged through the center of the support frame (301), a lever (303) arranged on one side of the distributing disc (302), and a sealing tube (304) arranged on one side of the trigger rod (202). The warning unit (400) comprises a laser sensor (401) arranged on the top of the trigger rod (202), and a plurality of indicator lights (402) arranged around the top of the trigger rod (202). The telescopic column (204) comprises a piston cylinder (204a) hinged to the outer wall of the rotating column (201), a piston rod (204b) hinged to the upper surface of the swing seat (205), and a return spring (204c) arranged inside the piston cylinder (204a). The swing seat (205) comprises a petal-shaped spherical wall (205a) arranged at one end thereof, a first dovetail groove (205b) arranged on the inner wall of the petal-shaped spherical wall (205a), a second dovetail groove (205c) arranged at the bottom of the swing seat (205), and a lifting surface (205d) arranged on both sides of the first dovetail groove (205b).

2. The coal screening device according to claim 1, wherein: The bin body (101) comprises an arc-shaped wall (101a), a conical wall (101b) arranged at the bottom of the arc-shaped wall (101a), an annular accommodating groove (101c) arranged inside the arc-shaped wall (101a), a cleaning opening (101d) arranged through one side of the arc-shaped wall (101a), and a discharge opening (101e) arranged at the bottom of the conical wall (101b). The sealing cover (102) comprises a feeding cylinder (102a) arranged on one side of the top thereof, and a first waist-shaped opening (102b) arranged on the sidewall of the feeding cylinder (102a). The bin door (103) is arranged in the annular accommodating groove (101c).

3. The coal screening device according to claim 2, wherein: The rotating column (201) comprises a spherical seat (201a) arranged at the bottom of the rotating column (201), a plurality of first dovetail strips (201b) arranged on the outer wall of the spherical seat (201a), a cutting surface (201c) arranged at the bottom of the spherical seat (201a), a cavity (201d) arranged in the interior of the rotating column (201), and a handle (201e) arranged on the column body of the rotating column (201).

4. The coal screening device according to claim 3, wherein: The trigger rod (202) comprises a supporting piece (202a) arranged on the lower rod body of the trigger rod (202), and a second waist-shaped opening (202b) arranged on the upper outer wall of the trigger rod (202).

5. The coal screening device according to claim 4, wherein: The lower inner wall of the first waist-shaped opening (102b) is misaligned with the lower inner wall of the second waist-shaped opening (202b).

6. The coal screening device according to claim 5, wherein: The screen (206) comprises a second dovetail strip (206a) arranged in the middle of the screen (206), and a blocking plate (206b) arranged on both sides of the screen (206); the screen (206) is in the shape of a fan.

7. The coal screening device according to claim 6, wherein: The distribution disc (302) comprises an umbrella-shaped plate (302a) arranged at the top of the distribution disc (302), and a straight rod (302b) arranged at the bottom of the umbrella-shaped plate (302a).

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