Pulverized coal screening and re-crushing integrated equipment based on size classification

Abstract

The invention belongs to the technical field of pulverized coal screening, and discloses pulverized coal screening and re-crushing integrated equipment based on size classification, which comprises a multi-stage screening box, a multi-stage screening drum is rotatably arranged on the inner side of the multi-stage screening box through a plurality of groups of bearing rings, and a gravity crushing assembly is slidably arranged on the inner side of the multi-stage screening drum. The gravity crushing assembly comprises two sets of limiting guide rods, and a set of balance weight crushing plates are slidably arranged on the outer sides of the two sets of limiting guide rods. Through cooperation of the gravity crushing assembly, the multi-stage screen drum and other structures, the balance weight crushing plate structures can be driven to move to the high position through rotation; coal briquettes located in the lower area of the screen drum are crushed through downward impact of gravity, the crushed coal briquettes can be screened again through the spiral feeder, pulverized coal is directly conveyed to be screened again after being crushed, working procedures can be effectively reduced, meanwhile, efficiency is improved, and the cost can be effectively reduced by utilizing gravity to crush the coal briquettes.

Description

Technical Field

[0001] This invention belongs to the field of coal powder screening technology, specifically an integrated coal powder screening and re-crushing device based on particle size classification. Background Technology

[0002] When mining and processing coal, the processing direction and application field are usually changed according to the size of the coal mine. Smaller coal mines are usually collected as coal powder. Coal powder has different particle sizes, and during screening, multi-stage screening devices are used to screen and collect the coal powder according to different particle sizes.

[0003] For example, utility model CN222872659U discloses a rotary drum screen for pulverized coal, belonging to the field of coke processing. It includes a mounting frame, within which a rotary drum screen is rotatably connected. A striking mechanism is located above the rotary drum screen. The striking mechanism includes a mounting bracket fixedly connected to the top of the mounting frame, a rack slidably connected to the top of the mounting bracket, a horizontal plate fixedly connected to the bottom of the rack, and several striking hammers fixedly connected to the bottom of the horizontal plate. The striking mechanism also includes a power component, and an auxiliary component is provided between the rotary drum screen and the mounting frame. The beneficial effects are: the striking mechanism, driven by the power component, raises the horizontal plate to a certain height, and then, under the action of gravity and the elastic force of a second spring, quickly moves downwards, striking the upper part of the rotary drum screen. This facilitates the removal of larger particles clogging the rotary drum screen, ensuring screening efficiency; a limiting plate is fixedly connected to the top of the rack, and a notch is provided on one side of the limiting plate to prevent the gears from affecting the descent of the limiting plate. In existing technologies, large particles still cannot be separated when screening coal powder. However, these large particles still need to be crushed again using a crushing device, which reduces the screening effect. Furthermore, repeated crushing requires additional crushing equipment, which greatly increases the screening cost. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides an integrated coal powder screening and re-crushing device based on particle size classification, which solves the problem of increased costs caused by the inability of existing coal powder screening devices to directly crush large particles.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated coal powder screening and re-crushing device based on particle size classification, comprising a multi-stage screening box, wherein a multi-stage screen cylinder is rotatably arranged on the inner side of the multi-stage screening box through a number of sets of bearing rings, and a gravity crushing component is slidably arranged on the inner side of the multi-stage screen cylinder; The gravity crushing assembly includes two sets of limiting guide rods, and a set of counterweight crushing plates is slidably arranged on the outer side of the two sets of limiting guide rods. The front and back of the counterweight crushing plates are provided with positioning grooves. The gravity crushing assembly includes two sets of arc-shaped positioning blocks, and two sets of limiting plates are installed on one side of the arc-shaped positioning blocks. A driving plate is rotatably arranged on the inner side of the limiting plate, and a movable bracket is rotatably arranged on the end of the driving plate away from the limiting plate. A positioning guide post is provided through the inner side of the movable bracket, and a fixing plate is installed at both ends of the positioning guide post. The fixing plate is fixedly installed on the front of the multi-stage screen cylinder. A guide post is installed on the front of the movable bracket. A guide ring is installed on the front of the inside of the multi-stage screening box. The guide post is slidably arranged on the inner side of the guide ring groove.

[0006] Preferably, a fixed crushing plate is fixedly installed on the top and bottom of the inner side of the multi-stage screen cylinder, and crushing spikes are welded to the top and bottom of the counterweight crushing plate.

[0007] Preferably, two sets of movable rings are movably arranged on the inner sides of both ends of the counterweight crushing plate. The movable rings are slidably arranged on the outer side of the limiting guide rod. A limiting ring is fixedly installed on the outer side of the middle part of the movable ring. The limiting ring is movably arranged on the inner side of the counterweight crushing plate. The top and bottom of the movable rings are flexibly connected to the surface of the counterweight crushing plate through a deformable membrane.

[0008] Preferably, positioning shafts are fixedly installed on both sides of the arc-shaped positioning block, and the positioning shafts are rotatably arranged on the inner side of the front of the multi-stage screen cylinder. The movable bracket is elastically connected to the fixed plate away from the arc-shaped positioning block by a support spring.

[0009] Preferably, a fixing sleeve is fixedly installed on the inner side of both ends of the fixed crushing plate, a top column is slidably arranged on the inner side of the fixing sleeve, and a pressure plate is installed on the top of the top column.

[0010] Preferably, a separator ring is installed at the bottom edge of the lower pressure plate, and the separator ring is slidably disposed inside the fixed sleeve. The bottom of the lower pressure plate and the inner side of the fixed sleeve are elastically connected by a fixing spring.

[0011] Preferably, a linkage impact component is provided inside the lower end of the multi-stage screening box; The linkage strike assembly includes two sets of welding frames. Movable columns are slidably arranged on the inner side of the welding frames. A set of movable plates is installed on the top of the two sets of movable columns, and two sets of fixed columns are installed on the top of the movable plates. The fixed columns are located below the top columns. The movable plates and the welding frames are elastically connected by a return spring.

[0012] Preferably, four sets of push plates are rotatably arranged on the sides of both ends of the movable plate, and an arc-shaped rod is rotatably arranged on the inner side of the two sets of push plates away from the movable plate.

[0013] Preferably, a set of striking brackets is installed at the ends of the two sets of arc-shaped rods away from the push plate, and the striking brackets are located below the multi-stage screen cylinder. An arc-shaped limiting sleeve is provided on the outer sliding sleeve of the arc-shaped rod, and the arc-shaped limiting sleeve is fixedly installed on the inner side of the lower end of the multi-stage screening box. A guide cover is installed between the four sets of arc-shaped limiting sleeves, and the guide cover is located above the movable plate.

[0014] Preferably, the bottom of the multi-stage screening box is provided with two sets of discharge ports, the bottom of the front and the back of the multi-stage screening box are connected to a screw feeder through pipes, and the front of the multi-stage screening box is bolted with a drive motor, and the output end of the drive motor is fixedly connected to the multi-stage screen cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the combination of a gravity crushing component and a multi-stage screen cylinder, facilitates the movement of a counterweight crushing plate structure to a higher position via rotation. The coal blocks located in the lower area of ​​the screen cylinder are then crushed by gravity impact. After crushing, the coal can be further screened via a screw feeder. The rotation of the multi-stage screen cylinder drives the limiting guide rod to rotate. During rotation, when the limiting guide rod is not perpendicular to the ground, the arc-shaped positioning block locks the counterweight crushing plate. When the limiting guide rod is perpendicular, the movable bracket drives the arc-shaped positioning block to flip via a drive plate. After flipping, the counterweight crushing plate, no longer restrained, falls along the limiting guide rod to crush the coal blocks. The crushed coal powder is then directly conveyed for further screening. This effectively reduces processes, improves efficiency, and utilizes gravity crushing to effectively reduce costs.

[0016] This invention utilizes a combination of linkage impact components and gravity crushing components. The impact force of the falling gravity crushing structure is used for linkage adjustment, thereby using the impact bracket to strike the inner wall of the multi-stage screen cylinder, effectively removing larger coal blocks stuck inside. During the fall of the counterweight crushing plate, it strikes the lower pressure plate. The bottom top column pushes the fixed column and movable plate downwards rapidly. During this movement, a push plate controls the arc-shaped rod to slide along the arc-shaped limit sleeve. The arc structure guides the impact bracket to strike the multi-stage screen cylinder, greatly dislodging coal blocks from gaps and preventing blockages that affect screening. Furthermore, the invention eliminates the need for motor control, effectively reducing costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the multi-stage sieve cylinder of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 5 This is a schematic diagram of the cross-sectional structure of the fixing sleeve of the present invention; Figure 6 This is a schematic diagram of the linkage strike component structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point C.

[0018] In the diagram: 100, multi-stage screening box; 101, discharge port; 102, screw feeder; 103, drive motor; 104, guide ring; 001. Gravity crushing assembly; 200. Counterweight crushing plate; 201. Multi-stage screen cylinder; 202. Fixed crushing plate; 203. Limiting guide rod; 204. Movable ring; 205. Deformation membrane; 206. Limiting ring; 207. Crushing spikes; 208. Positioning groove; 300. Arc-shaped positioning block; 301. Positioning shaft; 302. Limiting plate; 303. Drive plate; 304. Movable bracket; 305. Guide post; 306. Fixing plate; 307. Positioning guide post; 308. Support spring; 002. Linkage strike assembly; 400. Top column; 401. Fixing sleeve; 402. Fixing spring; 403. Lower pressure plate; 404. Separating ring; 500. Strike bracket; 501. Welding frame; 502. Movable column; 503. Return spring; 504. Movable plate; 505. Fixed column; 506. Push plate; 507. Arc rod; 508. Arc-shaped limit sleeve; 509. Guide cover. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1 to 7 As shown, the present invention provides an integrated coal powder screening and re-crushing device based on particle size classification, including a multi-stage screening box 100, a multi-stage screen cylinder 201 rotatably arranged on the inner side of the multi-stage screening box 100 through several sets of bearing rings, and a gravity crushing component 001 slidably arranged on the inner side of the multi-stage screen cylinder 201. The gravity crushing assembly 001 includes two sets of limiting guide rods 203. A set of counterweight crushing plates 200 is slidably arranged on the outer side of the two sets of limiting guide rods 203. Positioning grooves 208 are provided on the front and back of the counterweight crushing plates 200. The gravity crushing assembly 001 includes two sets of arc-shaped positioning blocks 300, and two sets of limiting plates 302 are installed on one side of the arc-shaped positioning blocks 300. A drive plate 303 is rotatably arranged on the inner side of the limiting plate 302, and a movable bracket 304 is rotatably arranged on the end of the drive plate 303 away from the limiting plate 302. A positioning guide post 307 is provided through the inner side of the movable bracket 304, and a fixing plate 306 is installed at both ends of the positioning guide post 307. The fixing plate 306 is fixedly installed on the front of the multi-stage screen cylinder 201. A guide post 305 is installed on the front of the movable bracket 304. A guide ring 104 is installed on the front inside the multi-stage screening box 100. The guide post 305 is slidably arranged on the inner side of the groove of the guide ring 104.

[0021] The above-mentioned scheme: The multi-stage screening box 100 is divided into multiple stages, providing installation positions for the inner structure. The multi-stage screen cylinder 201 is connected to the multi-stage screening box 100 via bearing rings, ensuring rotational force and connection strength to resist the impact force of the counterweight crushing plate 200. The counterweight crushing plate 200 is guided by the limiting guide rod 203, and the arc-shaped positioning block 300 is restricted by the positioning groove 208. After locking, the counterweight crushing plate 200 cannot slide. The limiting plate 302 is connected to the drive plate 303, so that the drive plate 303 can only move along the limiting plate. The inner side of 302 can be flipped and adjusted. The movable bracket 304 can be pushed to slide laterally by the drive plate 303. Conversely, the movable bracket 304 can drive the arc-shaped positioning block 300 to flip and adjust. The fixed plate 306 can restrict the positioning guide post 307 on the inner side to maintain the stability of the sliding adjustment of the movable bracket 304. The guide ring 104 can restrict the guide post 305. The upper and lower ends of the guide ring 104 are provided with protruding areas. After the guide post 305 slides to the protruding area, it can drive the arc-shaped positioning block 300 to flip and remove the restriction on the counterweight crushing plate 200.

[0022] like Figure 2 - Figure 4 As shown, a fixed crushing plate 202 is fixedly installed on the top and bottom of the inner side of the multi-stage screen cylinder 201, and crushing spikes 207 are welded to the top and bottom of the counterweight crushing plate 200.

[0023] Two sets of movable rings 204 are movably arranged on the inner sides of both ends of the counterweight crushing plate 200. The movable rings 204 are slidably arranged on the outer side of the limiting guide rod 203. A limiting ring 206 is fixedly installed on the outer side of the middle part of the movable rings 204. The limiting ring 206 is movably arranged on the inner side of the counterweight crushing plate 200. The top and bottom of the movable rings 204 are flexibly connected to the surface of the counterweight crushing plate 200 through a deformable membrane 205.

[0024] Positioning shafts 301 are fixedly installed on both sides of the arc-shaped positioning block 300. The positioning shafts 301 are rotatably set on the inner side of the front of the multi-stage screen cylinder 201. The movable bracket 304 is elastically connected to the fixed plate 306 away from the arc-shaped positioning block 300 by a support spring 308.

[0025] The above scheme is adopted as follows: the fixed crushing plate 202 can work with the counterweight crushing plate 200 to crush the coal blocks on the inner side. The crushing spikes 207 can increase the crushing effect. The limiting ring 206 can restrict the movable ring 204, so that the movable ring 204 will not separate from the counterweight crushing plate 200. The movable ring 204 can move inside the counterweight crushing plate 200. The ability to move can avoid the problem of jamming due to friction. The deformable membrane 205 can prevent coal powder from entering the movable area of ​​the movable ring 204 and causing blockage. The positioning shaft 301 can provide restriction for the arc-shaped positioning block 300 and assist in the flipping adjustment. The support spring 308 can push the movable bracket 304 and assist the movable bracket 304 in resetting and adjusting.

[0026] like Figure 5 - Figure 7 As shown, a fixing sleeve 401 is fixedly installed on the inner side of both ends of the fixed crushing plate 202. A top column 400 is slidably arranged on the inner side of the fixing sleeve 401, and a lower pressure plate 403 is installed on the top of the top column 400.

[0027] A separator ring 404 is installed at the bottom edge of the lower pressure plate 403, and the separator ring 404 is slidably disposed inside the fixed sleeve 401. The bottom of the lower pressure plate 403 and the inner side of the fixed sleeve 401 are elastically connected by a fixing spring 402.

[0028] The lower end of the multi-stage screening box 100 is equipped with a linkage impact component 002; The linkage strike assembly 002 includes two sets of welding frames 501. Movable columns 502 are slidably arranged on the inner side of the welding frames 501. A set of movable plates 504 is installed on the top of the two sets of movable columns 502, and two sets of fixed columns 505 are installed on the top of the movable plates 504. The fixed columns 505 are located below the top column 400. The movable plates 504 and the welding frames 501 are elastically connected by a return spring 503.

[0029] Four sets of push plates 506 are rotatably arranged on the sides of both ends of the movable plate 504, and an arc-shaped rod 507 is rotatably arranged on the inner side of the end of the two sets of push plates 506 away from the movable plate 504.

[0030] A set of impact brackets 500 is installed at the end of the two sets of arc rods 507 away from the push plate 506, and the impact brackets 500 are located below the multi-stage screen cylinder 201. Arc-shaped limiting sleeves 508 are provided on the outer sliding sleeve of the arc rods 507, and the arc-shaped limiting sleeves 508 are fixedly installed on the inner side of the lower end of the multi-stage screening box 100. A guide cover 509 is installed between the four sets of arc-shaped limiting sleeves 508, and the guide cover 509 is located above the movable plate 504.

[0031] Using the above scheme: the fixed sleeve 401 can provide a restriction for the inner structure. The fixed spring 402 can connect the lower pressure plate 403 to the fixed sleeve 401 to prevent the two sets of structures from separating. At the same time, the partition ring 404 can tightly connect the structure to prevent coal dust from entering the inner side. The top column 400 can push and trigger the linkage impact component 002 at the bottom. The welding frame 501 can restrict the inner movable column 502. The bottom of the movable column 502 is equipped with an end plate to prevent it from falling off. With the support and reset spring 503, the movable plate 504 can be pushed to rise and reset. With the fixed column 505 and the downward-moving top column 400, the movable plate 504 can be pushed to move down quickly. The push plate 506 can push the outer arc rod 507 to slide along the inner side of the arc-shaped limiting sleeve 508. The impact bracket 500 can then strike the side of the bottom of the multi-stage screen cylinder 201. The guide cover 509 can shield the structure below, which can prevent coal dust from directly contacting the movable structure to a certain extent and reduce the number of cleaning times.

[0032] like Figure 1 As shown, the bottom of the multi-stage screening box 100 is provided with two sets of discharge ports 101. The bottom and back of the front of the multi-stage screening box 100 are connected to a screw feeder 102 through pipes. The front of the multi-stage screening box 100 is bolted with a drive motor 103, and the output end of the drive motor 103 is fixedly connected to the multi-stage screen cylinder 201.

[0033] Using the above scheme: the coal powder of the corresponding particle size can be discharged and collected through the discharge port 101, and the crushed coal powder can be rotated through the feed port on the back of the multi-stage screening box 100 for further screening through the screw feeder 102. The drive motor 103 can provide rotational kinetic energy to the multi-stage screen cylinder 201 to ensure that the device can operate normally.

[0034] The working principle and usage process of this invention are as follows: First, coal powder is poured directly into the inside of the multi-stage screen cylinder 201 through the opening on the back of the multi-stage screening box 100. The multi-stage screen cylinder 201 is rotated and tilted at a certain angle to guide the coal powder into the second and third stage areas. After passing through the holes of the multi-stage screen cylinder 201, the coal powder will be discharged from the bottom outlet 101. Larger particles will accumulate in the third stage area. During the rotation of the multi-stage screen cylinder 201, the guide column 305 will slide along the inner side of the guide ring 104. When it slides to the protruding area, the movable support 304 will move towards the arc-shaped positioning block 300. During the movement, the drive plate 303 will push the arc-shaped positioning block 300 to flip along the positioning shaft 301. After flipping, the arc-shaped positioning block 300 will separate from the positioning groove 208. After separation, under the action of gravity, the counterweight crushing plate 200 will fall quickly. During the fall, it will cooperate with the fixed crushing plate 202 to impact and crush the coal blocks inside the section. Simultaneously, during the descent, the pressure plate 403 and the top column 400 will be pushed downwards rapidly. During the movement, the fixed column 505 and the movable plate 504 will move downwards synchronously. The moving movable plate 504 will use the push plate 506 to drive the arc rod 507 to slide along the inner side of the arc-shaped limiting sleeve 508, thereby pushing the impact bracket 500 to contact the multi-stage screen cylinder 201, thus achieving the impact effect.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated coal powder screening and re-crushing device based on particle size classification, comprising a multi-stage screening box (100), characterized in that: The inner side of the multi-stage screening box (100) is provided with a multi-stage screen cylinder (201) through a number of sets of bearing rings, and a gravity crushing component (001) is slidably provided on the inner side of the multi-stage screen cylinder (201). The gravity crushing assembly (001) includes two sets of limiting guide rods (203), and a set of counterweight crushing plates (200) is slidably arranged on the outer side of the two sets of limiting guide rods (203). The counterweight crushing plates (200) have positioning grooves (208) on the front and back. The gravity crushing assembly (001) includes two sets of arc-shaped positioning blocks (300), and two sets of limiting plates (302) are installed on one side of the arc-shaped positioning blocks (300). A driving plate (303) is rotatably arranged on the inner side of the limiting plate (302), and a movable bracket (304) is rotatably arranged on the end of the driving plate (303) away from the limiting plate (302). A positioning guide post (307) is provided through the inner side of the movable bracket (304), and a fixing plate (306) is installed at both ends of the positioning guide post (307). The fixing plate (306) is fixedly installed on the front of the multi-stage screen cylinder (201). A guide post (305) is installed on the front of the movable bracket (304). A guide ring (104) is installed on the front inside the multi-stage screening box (100), and the guide post (305) is slidably arranged on the inner side of the groove of the guide ring (104).

2. The integrated coal powder screening and re-crushing equipment based on particle size classification according to claim 1, characterized in that: Fixed crushing plates (202) are fixedly installed on the top and bottom of the inner side of the multi-stage screen cylinder (201), and crushing spikes (207) are welded to the top and bottom of the counterweight crushing plate (200).

3. The integrated coal powder screening and re-crushing equipment based on particle size classification according to claim 2, characterized in that: Two sets of movable rings (204) are movably arranged on the inner sides of both ends of the counterweight crushing plate (200). The movable rings (204) are slidably arranged on the outer side of the limiting guide rod (203). A limiting ring (206) is fixedly installed on the outer side of the middle part of the movable rings (204). The limiting rings (206) are movably arranged on the inner side of the counterweight crushing plate (200). The top and bottom of the movable rings (204) are flexibly connected to the surface of the counterweight crushing plate (200) through a deformable membrane (205).

4. The integrated coal powder screening and re-crushing equipment based on particle size classification according to claim 2, characterized in that: Positioning shafts (301) are fixedly installed on both sides of the arc-shaped positioning block (300). The positioning shafts (301) are rotatably set on the inner side of the front of the multi-stage screen cylinder (201). The movable bracket (304) is elastically connected to the fixed plate (306) away from the arc-shaped positioning block (300) by a support spring (308).

5. The integrated coal powder screening and re-crushing equipment based on particle size classification according to claim 2, characterized in that: A fixing sleeve (401) is fixedly installed on the inner side of both ends of the fixed crushing plate (202). A top column (400) is slidably provided on the inner side of the fixing sleeve (401), and a lower pressure plate (403) is installed on the top of the top column (400).

6. The integrated coal powder screening and re-crushing equipment based on particle size classification according to claim 5, characterized in that: A separator ring (404) is installed at the bottom edge of the lower pressure plate (403), and the separator ring (404) is slidably disposed inside the fixed sleeve (401). The bottom of the lower pressure plate (403) and the inner side of the fixed sleeve (401) are elastically connected by a fixing spring (402).

7. The integrated coal powder screening and re-crushing equipment based on particle size classification according to claim 1, characterized in that: The lower end of the multi-stage screening box (100) is equipped with a linkage impact component (002). The linkage strike assembly (002) includes two sets of welding frames (501). Movable columns (502) are slidably arranged on the inner side of the welding frames (501). A set of movable plates (504) is installed on the top of the two sets of movable columns (502), and two sets of fixed columns (505) are installed on the top of the movable plates (504). The fixed columns (505) are located below the top column (400). The movable plates (504) and the welding frames (501) are elastically connected by a return spring (503).

8. The integrated coal powder screening and re-crushing equipment based on particle size classification according to claim 7, characterized in that: Four sets of push plates (506) are rotatably provided on the sides of both ends of the movable plate (504), and an arc-shaped rod (507) is rotatably provided on the inner side of the end of the two sets of push plates (506) away from the movable plate (504).

9. The integrated coal powder screening and re-crushing equipment based on particle size classification according to claim 8, characterized in that: Two sets of arc rods (507) are equipped with a set of impact brackets (500) at the ends away from the push plate (506), and the impact brackets (500) are located below the multi-stage screen cylinder (201). The outer sliding sleeve of the arc rod (507) is provided with an arc-shaped limiting sleeve (508), and the arc-shaped limiting sleeve (508) is fixedly installed on the inner side of the lower end of the multi-stage screening box (100). A guide cover (509) is installed between the four sets of arc-shaped limiting sleeves (508), and the guide cover (509) is located above the movable plate (504).

10. The integrated coal powder screening and re-crushing equipment based on particle size classification according to claim 1, characterized in that: The bottom of the multi-stage screening box (100) is provided with two sets of discharge ports (101). The bottom and back of the front of the multi-stage screening box (100) are connected to a screw feeder (102) through pipes. The front of the multi-stage screening box (100) is bolted with a drive motor (103), and the output end of the drive motor (103) is fixedly connected to the multi-stage screen cylinder (201).

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