Coal screening device

Abstract

The invention discloses a coal material screening device, which relates to the technical field of coal material screening, and comprises a pulverized coal bunker, a coal dust bin, a coal dust bin, a coal dust bin cover and a coal dust bin door, the filtering unit comprises a rotating column, a triggering rod, a stabilizing spring, a telescopic column, a swinging seat and a screen. The device has the beneficial effects that whether pulverized coal is accumulated or not can be fed back in time, irregular inspection work of personnel is avoided, the inspection frequency is reduced, meanwhile, the cleaning range can be expanded, the filter screens at all positions are detached and carefully cleaned, and the cleaning efficiency is improved. In addition, mechanical isolation is carried out on two states of pulverized coal impact and pressure applied to the swing seat by pulverized coal accumulation, so that false alarm is prevented, more serious accumulation in the pulverized coal impact state is avoided, and the risk of burning in the state during cleaning is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coal screening, in particular to a coal screening device. Background Art

[0002] In the traditional 165MW unit boiler, a central storage type pulverizing system is used. The coal powder sieve from the fine powder separator to the powder bin in the current pulverizing system is fixed between the first and second air locks on the upper part of the powder bin. An inspection hole is opened on the top of the bin where the coal powder sieve is located. When the coal powder is mixed with rags, woven bags, hay, plastic bags and other debris, the coal powder will accumulate on the sieve, affecting the discharge of materials or directly blocking the discharge port. At this time, manual hands are required to reach in to clean up the debris.

[0003] Since the inspection hole on the chamber is small, it is very difficult for personnel to clean it. Secondly, the range of movement of the hands is limited, so the coal powder screen cannot be fully cleaned. Thirdly, the temperature of the accumulated coal powder is high, and it is inevitable that the hands will be burned during the cleaning process. Finally, since the time of accumulation is difficult to predict, personnel need to conduct frequent inspections to clean it in time to avoid accumulation and blockage. Therefore, a coal screening device is needed to solve the above problems. Summary of the invention

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

[0005] Therefore, the purpose of the present invention is to provide a coal screening device, which can solve the problem of blockage by debris in the pulverizing system, and also solve the problem that it is difficult and limited for personnel to clear out the debris and they are prone to burns. In addition, it also solves the problem that personnel have the need for high-frequency inspections.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A coal screening device, comprising a coal powder bin, including a bin body, a sealing cover arranged on the top of the bin body, and a bin door arranged in the side wall of the bin body; The filter unit includes a rotating column penetrating the center of the sealing cover, a trigger rod penetrating 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 seat; A material distribution unit comprises a support frame arranged at the upper end of the sealing cover, a material distribution plate penetrating the center of the support frame, a lever arranged at one side of the material distribution plate, and a sealing tube arranged at one side of the trigger rod; The warning unit comprises a laser sensor arranged on the top of the trigger rod and a plurality of indicator lights arranged around the top of the trigger rod.

[0007] As a preferred embodiment of the coal screening device of the present invention, the bin body comprises an arc-shaped wall, a conical wall arranged at the bottom of the arc-shaped wall, an annular receiving groove arranged inside the arc-shaped wall, a cleaning opening arranged through one side of the arc-shaped wall, and a discharge opening arranged at the bottom of the conical wall; The sealing cover comprises a feed port arranged on one side of the top thereof, and a first waist-shaped port arranged on the side wall of the feed port; The bin door is arranged in the annular containing groove.

[0008] As a preferred solution of the coal screening device described in the present invention, the rotating column includes a spherical seat arranged at the bottom thereof, a plurality of first dovetail strips arranged on the outer wall of the spherical seat, a cutting surface arranged at the bottom of the spherical seat, a chamber arranged inside the rotating column, and a handle arranged on the body of the rotating column.

[0009] As a preferred solution of the coal screening device of the present invention, the trigger rod includes a supporting plate arranged on the rod body below the trigger rod, and a second waist-shaped opening arranged on the outer wall above the trigger rod.

[0010] As a preferred solution of the coal screening device of the present invention, the lower inner wall of the first kidney-shaped opening is offset from the lower inner wall of the second kidney-shaped opening.

[0011] As a preferred solution 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 arranged inside the piston cylinder.

[0012] As a preferred solution of the coal screening device described in the present invention, the swing seat includes a petal-shaped spherical wall arranged at one end thereof, a first dovetail groove arranged on the inner wall of the petal-shaped spherical wall, a second dovetail groove arranged at the bottom of the swing seat, and lifting surfaces arranged on both sides of the first dovetail groove.

[0013] As a preferred solution of the coal screening device of the present invention, the screen includes a second dovetail bar arranged in the middle and blocking plates arranged on both sides of the screen; the screen is fan-shaped.

[0014] As a preferred solution of the coal screening device of the present invention, the distribution plate includes an umbrella-shaped plate arranged on the top thereof, and a straight rod arranged on the bottom of the umbrella-shaped plate.

[0015] The beneficial effects of the present invention are as follows: the present invention can timely provide feedback on whether coal powder has accumulated, thereby avoiding irregular inspections by personnel and reducing the frequency of inspections. At the same time, it can expand the scope of cleaning and dismantle the filter screens at various locations for detailed cleaning. In addition, the two states of coal powder impact and coal powder accumulation exerting pressure on the swing seat are mechanically isolated to prevent false alarms while avoiding more serious accumulation in the coal powder impact state, reducing the risk of burns during cleaning in this state. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 1 It is a three-dimensional overall structure diagram of the present invention.

[0018] Figure 2 It is a top view of the present invention after removing the warehouse body.

[0019] Figure 3 For the present invention Figure 2 AA full section view.

[0020] Figure 4 For the present invention Figure 3 A is a partial enlarged view of the

[0021] Figure 5 It is a partial exploded view of the filter unit of the present invention.

[0022] In the figure: 100, coal powder 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, swing seat; 206, screen; 300, material distribution unit; 301, support frame; 302, material distribution plate; 303, lever; 304, sealing tube; 400, warning unit; 401, laser sensor; 402, indicator light; 101a, arc wall; 101b, conical wall; 101c, annular receiving groove; 101d, cleaning opening; 101 e, discharge port; 102a, feed port; 102b, first waist-shaped port; 201a, spherical seat; 201b, first dovetail strip; 201c, cutting surface; 201d, chamber; 201e, handle; 202a, supporting plate; 202b, second waist-shaped port; 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, blocking plate; 302a, umbrella-shaped plate; 302b, straight rod. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one 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 term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0026] Example 1 Reference Figure 1~Figure 5 , which is the first embodiment of the present invention, and provides a coal screening device, which includes a coal powder bin 100, including 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 side wall of the bin body 101; The filter unit 200 includes a rotating column 201 penetrating the center of the sealing cover 102, a trigger rod 202 penetrating 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 seat 205; The material distribution unit 300 includes a support frame 301 disposed on the upper end of the sealing cover 102, a material distribution plate 302 penetrating the center of the support frame 301, a lever 303 disposed on one side of the material distribution plate 302, and a sealing tube 304 disposed on one side of the trigger rod 202; The warning unit 400 includes a laser sensor 401 disposed on the top of the trigger rod 202 and a plurality of indicator lights 402 disposed around the top of the trigger rod 202 .

[0027] Furthermore, the bin 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; The sealing cover 102 includes a feed port 102a disposed on one side of the top thereof, and a first waist-shaped port 102b disposed on the side wall of the feed port 102a; The door 103 is disposed in the annular receiving groove 101c.

[0028] Furthermore, the rotating column 201 includes a spherical seat 201a arranged at the bottom thereof, 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 chamber 201d arranged inside the rotating column 201, and a handle 201e arranged on the body of the rotating column 201.

[0029] Furthermore, the trigger rod 202 includes a supporting piece 202 a disposed on the lower rod body thereof, and a second waist-shaped opening 202 b disposed on the outer wall above the trigger rod 202 .

[0030] Furthermore, the lower inner wall of the first waist-shaped opening 102b is offset from the lower inner wall of the second waist-shaped opening 202b.

[0031] 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 arranged inside the piston cylinder 204a.

[0032] Furthermore, the swing seat 205 includes 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 lifting surfaces 205d arranged on both sides of the first dovetail groove 205b.

[0033] Furthermore, the screen 206 includes a second dovetail bar 206a disposed in the middle thereof, and blocking plates 206b disposed on both sides of the screen 206; the screen 206 is fan-shaped.

[0034] Furthermore, the material distribution plate 302 includes an umbrella-shaped plate 302a disposed on the top thereof, and a straight rod 302b disposed on the bottom of the umbrella-shaped plate 302a.

[0035] It should be noted that the pulverized coal bin 100 is in an inverted cone shape as a whole, and the bin body 101 is composed of an arc wall 101a at the upper end and a conical wall 101b at the lower end, and the cross section of the arc wall 101a is an arc shape, and the arc wall 101a has only one spherical center. The conical wall 101b is fixed to the lower end surface of the arc wall 101a, and is used to collect the pulverized coal after filtering, and then the pulverized coal is discharged from the discharge port 101e below the conical wall 101b to the next process. A cleaning opening 101d is also provided on the side of the arc wall 101a. The cleaning opening 101d is in a regular strip shape. In addition, a hollow annular receiving groove 101c is provided inside the arc wall 101a. The annular receiving groove 101c can just accommodate the warehouse door 103, so that the warehouse door 103 can rotate circumferentially along the annular receiving groove 101c. Since a handle is fixed on the warehouse door 103, the warehouse door 103 can only move within the range of the cleaning opening 101d. In order to ensure the sealing performance, the length of the warehouse door 103 should be greater than the length of the cleaning opening 101d. Therefore, personnel can open and close the warehouse body 101 by pushing and pulling the warehouse door 103.

[0036] Preferably, the sealing cover 102 is fixed to the upper end surface of the bin body 101 by bolts, and a cylindrical feed port 102a is fixed on the top surface of the sealing cover 102 for inputting coal powder, and a first waist-shaped port 102b in the form of a channel is fixed on the side wall of the feed port 102a pointing to the axis of the sealing cover 102. It should be noted that the feed port 102a and the sealing cover 102 are not in a concentric position relationship, and in addition, when installing the sealing cover 102, the feed port 102a needs to be away from the bin door 103 to prevent the coal powder from accidentally falling on the bin door 103 when the operator is cleaning, causing burns to the operator.

[0037] Preferably, the rotating column 201 passes through the center of the sealing cover 102 from the top, and a handle 201e is fixed on the top of the rotating column 201. The operator can adjust the rotation angle of the rotating column 201 by rotating the handle 201e. In addition, the handle 201e can make the rotating column 201 hang on the sealing cover 102, so as to position the rotating column 201. It should be noted that at the joint of the rotating column 201 and the sealing cover 102, a limiting structure composed of an annular strip and an annular groove is also provided between the two to ensure that the rotating column 201 will not be separated from the sealing cover 102.

[0038] A spherical seat 201a is fixed at the bottom of the rotating column 201. The spherical seat 201a has a spherical inner cavity. In addition, a cutting surface 201c is fixed at the bottom of the spherical seat 201a, so that the spherical seat 201a presents a bottle-like structure, which can leave a margin for the movement of the swing seat 205. A plurality of first dovetail strips 201b distributed circumferentially are fixed on the outer wall of the spherical seat 201a. In this embodiment, there are four first dovetail strips 201b extending from top to bottom along the outer wall of the spherical seat 201a. The petal-shaped spherical wall 205a fixed at the end of the swing seat 205 also has a first dovetail groove 205b of the same shape and size and completely penetrating from top to bottom on its inner wall. Therefore, the first dovetail strip 201b and the first dovetail groove 205b can cooperate with each other, so that the swing seat 205 can swing circumferentially along the extension direction of the first dovetail strip 201b.

[0039] Preferably, the center of the spherical seat 201a is consistent with the center of the arc wall 101a.

[0040] The rotating column 201 itself is a cylindrical structure with an inner cavity, which is connected with the spherical inner cavity in the spherical seat 201a and forms a chamber 201d.

[0041] Preferably, the trigger rod 202 is a columnar structure with a weight-reducing cavity therein, a supporting plate 202a is fixed on the outer wall adjacent to the bottom end of the trigger rod 202, the supporting plate 202a is located inside the spherical seat 201a, and a channel-shaped second waist-shaped opening 202b is fixed on the outer wall adjacent to the top end of the trigger rod 202.

[0042] Preferably, the second waist-shaped opening 202b points to the first waist-shaped opening 102b, and the outer wall shape of the second waist-shaped opening 202b is consistent with that of the first waist-shaped opening 102b, while 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.

[0043] Preferably, the stabilizing spring 203 is sleeved on the rod body of the trigger rod 202, below the supporting plate 202a, and the other end of the stabilizing spring 203 contacts the bottom of the inner cavity of the spherical seat 201a, so that the trigger rod 202 is supported by the stabilizing spring 203, in a state of being approximately suspended and not pressing against the upper end of the inner cavity of the spherical seat 201a.

[0044] Preferably, the swing seat 205 is rod-shaped, the number of which is the same as the first dovetail strip 201b, and radially extends along the arc wall 101a, so that the outer end of the swing seat 205 fits the arc wall 101a, and the other end is fixedly connected to the petal-shaped spherical wall 205a, the inner wall of the petal-shaped spherical wall 205a fits the outer wall of the spherical seat 201a, and the two side walls of each petal-shaped spherical wall 205a fit each other. Therefore, the swing seat 205 can swing up and down. It should be noted that when the swing seat 205 swings downward, its outer end will be limited by the joint between the arc wall 101a and the arc wall 101a, that is, the travel limit.

[0045] In addition, when the crossbars of the swing seats 205 are horizontal at the same time, the lower part of the inner wall of the petal-shaped spherical wall 205a is just below the cutting surface 201c of the spherical seat 201a. The lower part of the inner wall of the petal-shaped spherical wall 205a bulges outward compared to the spherical inner wall, forming an arc-shaped lifting surface 205d. It should be noted that the bottom of the petal-shaped spherical wall 205a is rounded, which is basically consistent with the bottom end face of the trigger rod 202, and the extension of the bottom end face of the trigger rod 202 is also rounded.

[0046] A second dovetail groove 205c extending outward is provided below the cross bar of the swing seat 205, and a second dovetail bar 206a is fixed to the upper end face of the screen 206, which can cooperate with the second dovetail groove 205c, so that the screen 206 can move axially along the second dovetail bar 206a. Therefore, the screen 206 can be removed from or installed on the swing seat 205.

[0047] Preferably, in order 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, so that the swing seat 205 can be lifted, and the number of telescopic columns 204 is consistent with the swing seat 205. Specifically, the sealed 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 fitted with the sealed 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, the return spring 204c is sleeved on the rod body of the piston rod 204b, and its two ends are respectively fixed to the piston surface and the open end of the piston cylinder 204a. When the swing seat 205 is under load and moves downward, it needs to overcome the elastic force of the return spring 204c and pull the piston rod 204b outward. When the swing seat 205 moves upward, it is reset by the return spring 204c, pushing the piston rod 204b and pulling up the swing seat 205. It should be noted that since the bottom of the piston fits the sealing end of the piston cylinder 204a, when the swing seat 205 swings upward, it reaches the horizontal position, which is the stroke limit.

[0048] Preferably, the screen 206 is fan-shaped, and its inner side is in contact with the outer wall of the petal-shaped spherical wall 205a to ensure sealing ability, while the outer side is in contact with the inner wall of the arc wall 101a, and the two side walls of each screen 206 are in contact with each other. When the coal powder is mixed with debris such as rags, woven bags, hay, plastic bags, etc., the coal powder will accumulate on the screen, causing the swing seat 205 to swing down under the load. On the two side walls of the screen 206, a blocking plate 206b is fixed downward. When one of the swing seats 205 swings down under the load, the screen 206 at that place will be misaligned with other screens 206, forming a leak, so that the coal powder and debris escape from it, which has a serious impact on the subsequent process. Therefore, the blocking plates 206b on both sides of the screen 206 that have not swung down can block the leak and prevent such incidents from happening. The blocking surface of the blocking plate 206b only needs to be slightly larger than the fan-shaped leak, and the specific shape is determined according to demand or actual conditions and is not limited.

[0049] Preferably, a support frame 301 is fixed on the inner wall of the feed port 102a on the sealing cover 102, the number of support legs on the support frame 301 is at least one, and a material distribution plate 302 is passed through the support frame 301 at the axial position of the feed port 102a. The material 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 port 102a, and a lever 303 is fixed on the side wall of the straight rod 302b. 03 extends out 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 falls on 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 micro-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. The bellows used in this embodiment can facilitate the movement of the trigger rod 202 while ensuring air tightness.

[0050] Preferably, a laser sensor 401 is provided at the top of the trigger rod 202. The laser displacement sensor used in this embodiment is used to monitor the position change of the trigger rod 202 to a certain extent. When the trigger rod 202 is detected to have a displacement exceeding the displacement threshold, the indicator light 402 around the top of the trigger rod 202 becomes brighter, thereby reminding the operator that coal powder is accumulated. The indicator light 402 can be an LED light or a laser indicator. It should be noted that the trigger rod 202 will only provide a light reminder when it is moving upward.

[0051] When in use, the coal powder first reaches 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 diffused around to improve the filtration efficiency. The umbrella-shaped plate 302a will cause the distribution plate 302 to move downward due to the impact of the coal powder, thereby driving the trigger rod 202 to move downward through the lever 303.

[0052] Then the bottom surface of the trigger rod 202 passes over the bottom of the petal-shaped spherical wall 205a, so that the bottom of the petal-shaped spherical wall 205a abuts against the rod of the trigger rod 202. At this time, the impact caused by the falling coal powder will not cause the swing seat 205 to swing down. Otherwise, if the trigger rod 202 does not consider the downward process, the swing seat 205 will swing down under the impact when the coal powder falls, and then the outer edge of the bottom of the trigger rod 202 will be squeezed and lifted 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 location to far exceed the amount of accumulation of the screen 206 in the horizontal state, which is more likely to cause coal powder blockage. When cleaning, a large amount of coal powder will even gush out from the cleaning port 101d.

[0053] When the coal powder input process is finished, the material distribution plate 302 is no longer impacted, and the stabilizing spring 203 is reset from the compressed state, pushing the trigger rod 202 to the initial position. If there is no accumulation of coal powder input this time, there is no need to clean out the debris; if the coal powder input this time is accumulated on the screen 206, when the trigger rod 202 is pushed to the initial position, the swing seat 205 is swung down by the gravity of the accumulated coal powder, and the telescopic column 204 is also pulled apart by the swing seat 205, and the bottom of the trigger rod 202 is then squeezed by the bottom of the petal-shaped spherical wall 205a, and the lifting surface 205d lifts the telescopic column 204, and finally the indicator light 402 gives a light reminder.

[0054] Then, the operator rotates the handle 201e, so that the rotating column 201 rotates the screen 206 at the powder falling point to the bin door 103, and then pushes open the bin door 103 to clean the accumulated coal powder and remove the debris. In this process, the operator will not be burned by the coal powder accidentally falling from the feed port 102a, and the coal powder and debris will not leak out from the air.

[0055] After cleaning, the telescopic column 204 pulls the swing seat 205 back again, and the screen 206 can be removed at this time for more detailed cleaning. The petal-shaped spherical wall 205a no longer squeezes the trigger rod 202, and the trigger rod 202 falls back onto the stabilizing spring 203 under its own weight, and the material distribution plate 302 is also reset, and the indicator light 402 is also turned off. At this time, the other screens 206 are facing the feed port 102a, waiting for the next cleaning.

[0056] In summary, this design can provide timely feedback on whether coal powder has accumulated, avoid irregular inspections by personnel, reduce the frequency of inspections, and at the same time expand the scope of cleaning, dismantle the filter screens at various locations, and perform detailed cleaning. In addition, the two states of coal powder impact and coal powder accumulation exerting pressure on the swing seat are mechanically isolated to prevent false alarms while avoiding more serious accumulation under the coal powder impact state, reducing the risk of burns during cleaning under this state.

[0057] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention 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 invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A coal screening device, characterized in that: include, A pulverized 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 a side wall of the bin body (101); The filter unit (200) comprises a rotating column (201) penetrating the center of the sealing cover (102), a trigger rod (202) penetrating 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 seat (205); The material distribution unit (300) comprises a support frame (301) arranged at the upper end of the sealing cover (102), a material distribution plate (302) penetrating the center of the support frame (301), a lever (303) arranged at one side of the material distribution plate (302), and a sealing tube (304) arranged at 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).

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

3. The coal screening device according to claim 2, characterized in that: The rotating column (201) comprises a spherical seat (201a) arranged at the bottom thereof, 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 chamber (201d) arranged inside the rotating column (201), and a handle (201e) arranged on the body of the rotating column (201).

4. The coal screening device according to claim 3, characterized in that: The trigger rod (202) comprises a supporting plate (202a) arranged on the rod body below the trigger rod (202), and a second waist-shaped opening (202b) arranged on the outer wall above the trigger rod (202).

5. The coal screening device according to claim 4, characterized in that: The lower inner wall of the first waist-shaped opening (102b) and the lower inner wall of the second waist-shaped opening (202b) are offset.

6. The coal screening device according to claim 5, characterized in that: 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).

7. The coal screening device according to claim 6, characterized in that: 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 lifting surfaces (205d) arranged on both sides of the first dovetail groove (205b).

8. The coal screening device according to claim 7, characterized in that: The screen (206) comprises a second dovetail strip (206a) arranged in the middle thereof, and blocking plates (206b) arranged on both sides of the screen (206); the screen (206) is fan-shaped.

9. The coal screening device according to claim 8, characterized in that: The material distribution plate (302) comprises an umbrella-shaped plate (302a) arranged on the top thereof, and a straight rod (302b) arranged on the bottom of the umbrella-shaped plate (302a).

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