A micro-power dust removal system and method applied to a coal preparation system

Abstract

The present invention relates to the technical field of air dust removal, and particularly to a micro-power dust removal system and method applied to a coal preparation system, which includes an isolation mechanism and an opening and closing mechanism. The isolation mechanism includes an external housing, a sliding guide rod, a first spring, a sliding plate, a support ring, a hinge shaft, and a dust baffle. An external housing is fixedly connected to the main box body. A sliding plate is slidably connected to the sliding guide rod inside the external housing. A first spring is sleeved on the sliding guide rod. A support ring is fixedly connected to the sliding plate. A plurality of dust baffles are rotatably connected to the support ring through the hinge shaft. The plurality of dust baffles can be closed into a cylindrical shape to prevent dust from scattering. When the dust removal system performs dust cleaning, the dust baffles closed into a cylindrical shape are used to cover the outside of the filter bag, which can not only prevent the dust from being blown onto other filter bags that have been cleaned, but also play a guiding role, so that the compressed air drives the dust to flow rapidly towards the bottom of the dust discharge box for discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of air dust removal, and particularly to a micro-power dust removal system and method applied to a coal preparation system. Background Art

[0002] The conventional coal preparation process refers to the "first mixing then crushing" process flow. Coal in the coal yard is loaded by a loader through a coal receiving pit, a belt, a coal storage tank (mixed coal), a crusher (crushing and mixing), and a coal tower.

[0003] During the coal preparation process, operations such as crushing and conveying will generate a large amount of dust and particulate matter. These fine dusts will not only interfere with the normal operation of coal mine equipment but also pose a serious threat to the physical health of employees.

[0004] Pulse bag filters are widely used in coal preparation operation scenarios because of their high filtration performance and ability to effectively capture and remove fine dust in the air. However, in the prior art, when cleaning the filter bags of pulse bag filters, the equipment generally needs to be stopped, that is, the cleaning of the filter bags and the filtration of dust cannot be carried out simultaneously, resulting in the ineffective treatment of dust in the air during the cleaning process. Moreover, when blowing and cleaning the filter bags, the dust will be blown onto the surrounding already cleaned filter bags, resulting in incomplete cleaning of the filter bags and the need to increase the cleaning frequency during use. Summary of the Invention

[0005] In order to overcome the drawback that in the prior art, when cleaning the filter bags of pulse bag filters, the dust will be blown onto the surrounding already cleaned filter bags, resulting in incomplete cleaning of the filter bags and the need to increase the cleaning frequency, the technical problem of the present invention is to provide a micro-power dust removal system and method applied to a coal preparation system.

[0006] The technical solution is as follows: A micro-power dust removal system applied to a coal preparation system includes a pulse bag filter. The pulse bag filter includes a main box body, a dust discharge box, an air inlet pipe, a fixing plate, filter bags, a compressed air tank, and a blowing pipe. It is characterized in that it further includes an isolation mechanism and an opening and closing mechanism. The isolation mechanism includes an external shell, a sliding guide rod, a first spring, a sliding plate, a support ring, a hinge shaft, and a dust baffle. The external shell is fixedly connected to the main box body. The sliding plate is slidably connected to the sliding guide rod in the external shell. The first spring is sleeved on the sliding guide rod. The support ring is fixedly connected to the sliding plate. A plurality of dust baffles are rotatably connected to the support ring through the hinge shaft. The plurality of dust baffles can be closed into a cylindrical shape to prevent dust from flying. An opening and closing mechanism for controlling the opening and closing of the dust baffles to cover the outside of the filter bags is connected to the support ring.

[0007] Preferably, the opening and closing mechanism includes a middle connecting rod, a deploying guide rod, a second spring, a connecting shaft, a deploying guide rail, a lower connecting rod, a stress plate and a thrust plate. Two middle connecting rods are symmetrically and slidably connected to the support ring. Two deploying guide rods are symmetrically and slidably connected to the middle connecting rod. A second spring is sleeved on the deploying guide rod. A connecting shaft is rotatably connected to the deploying guide rod. Each connecting shaft is fixedly connected to a dust shield. The connecting shaft is slidably connected in the deploying guide rail opened on the support ring. When the middle connecting rod slides, it will drive the connecting shaft to slide in the deploying guide rail. When the connecting shaft slides along the deploying guide rail, it can drive a plurality of dust shields to deploy or close. One end of a lower connecting rod is rotatably connected to the middle connecting rod. The other end of the lower connecting rod is rotatably connected to a stress plate. A thrust plate is fixedly connected in the main box body. During the movement of the sliding plate, the thrust plate will intermittently push the stress plate upwards to drive the middle connecting rod to slide through the lower connecting rod.

[0008] Preferably, it further includes a partition plate. The partition plate is fixedly connected in the main box body and the dust exhaust box. The partition plate is used to symmetrically divide the space inside the main box body and the dust exhaust box. There are two groups each of the fixing plate, the filter bag and the compressed air tank on the pulse bag filter. There are also two groups each of the isolation mechanism and the opening and closing mechanism correspondingly.

[0009] Preferably, it further includes a driving mechanism for driving the two groups of isolation mechanisms to move alternately. The driving mechanism is connected to the support ring. The driving mechanism includes a bidirectional lead screw, a motor, a threaded sleeve, a lifting plate, a clamping convex block, a third spring, a clamping concave block and a transmission component. A motor for driving the bidirectional lead screw to rotate is fixedly connected to the main box body. The bidirectional lead screw is rotatably connected to the main box body and is located inside the partition plate. The threaded sleeve is threadedly connected to the bidirectional lead screw. Two lifting plates are slidably connected to the threaded sleeve. A clamping convex block is slidably connected to the lifting plate. A third spring is sleeved on the guide rod of the clamping convex block. The clamping concave block is slidably connected to the partition plate. The lower side of the clamping concave block is located inside the partition plate. The clamping concave block is fixedly connected to the support ring on the same side. The clamping convex block and the clamping concave block are inserted and matched. A transmission component is connected to the lifting plate. The transmission component is used to drive the two clamping convex blocks to alternately insert into the clamping concave blocks on the same side, so as to alternately drive the two groups of isolation mechanisms to move.

[0010] Preferably, the transmission component includes a transmission support rod, a transmission guide frame, a transmission lead screw, a main buckle, a transmission gear, a sub-buckle, a toothed plate and a fourth spring. Transmission support rods are fixedly connected to the inner walls on both left and right sides of the main box body. A transmission guide frame is slidably connected to the transmission support rod. A fourth spring is sleeved on the transmission guide frame. A main buckle is rotatably connected to the transmission guide frame. A transmission lead screw is fixedly connected to the transmission support rod. The main buckle is threadedly connected to the transmission lead screw. A transmission gear and two sub-buckles are coaxially and rotatably connected to the lifting plate. The sub-buckle and the main buckle are clamped and matched. A toothed plate is fixedly connected to the lifting plate. The toothed plate and the transmission gear remain meshed.

[0011] Preferably, a limiting mechanism for restricting the movement of the lifting plate is further included. The limiting mechanism is connected to the lifting plate and includes a limiting block, a limiting spring, a limiting guide rod, a fifth spring, and a limiting ejector rod. Two limiting blocks for restricting the movement of the lifting plate are slidably connected to the threaded sleeve. A limiting spring is sleeved on the guide rod on which the limiting block slides. Limiting guide rods are fixedly connected to the inner walls on both the left and right sides of the main box body. A fifth spring is sleeved on the limiting guide rod. A limiting ejector rod is slidably connected to the limiting guide rod, and the limiting ejector rod is used to separate the limiting block from the lifting plate.

[0012] Preferably, a dust-proof cloth for preventing dust from entering the partition is further included. One end of the dust-proof cloth is fixedly connected to the clamping concave block, and the other end of the dust-proof cloth is fixedly connected to the partition. The dust-proof cloth is located in the slideway of the clamping concave block.

[0013] Preferably, a shaking mechanism for driving the filter bag to shake is further included. The shaking mechanism is connected to the lead screw and includes a driving pulley, a driven pulley, a cam, a vibration connecting rod, a sixth spring, and a first transmission belt. A driving pulley is fixedly connected to the bidirectional lead screw. A driven pulley and a cam are coaxially rotatably connected to the main box body. The driven pulley and the driving pulley on the same side are jointly wound with a first transmission belt. A sixth spring is sleeved on the fixing plate, and a vibration connecting rod is fixedly connected to the fixing plate. When the cam rotates, the fixing plate will be intermittently lifted upward through the vibration connecting rod.

[0014] Preferably, a blocking mechanism for enabling the dust-containing gas to only flow to one side of the partition is further included. The blocking mechanism is connected to the support ring and includes a blocking door, a torsion spring, a first gear, a rack, a first pulley, a second gear, a second pulley, and a second transmission belt. Two blocking doors are rotatably connected to the air inlet pipe, and the two blocking doors are respectively located on both sides of the partition. A torsion spring is connected between the blocking door and the air inlet pipe. A first gear is fixedly connected to the front blocking door. A rack is fixedly connected to one of the support rings in each isolation mechanism. A first pulley is fixedly connected to the upper part of the rear blocking door. A second gear and a second pulley are coaxially rotatably connected to the inner wall of the main box body. The first pulley and the second pulley are jointly wound with a second transmission belt.

[0015] A dust removal method for a micro-power dust removal system applied to a coal preparation system specifically includes the following steps:

[0016] In the first step, when dust cleaning is required, the sliding plate is made to slide along the sliding guide rod. During this process, the opening and closing mechanism will first drive the multiple dust baffle plates on the support ring to unfold. When the support ring moves below the filter bag, the multiple dust baffle plates are closed into a cylindrical shape, and the dust baffle plates cover the filter bag. At this time, the sliding plate is stopped.

[0017] In the second step, the corresponding blowing pipe is controlled to blow compressed air into the filter bag to blow the dust off the filter bag.

[0018] In the third step, the sliding plate is controlled to continue to move, and the multiple dust shields on the same support ring are unfolded and moved to the position of the next group of filter bags. When the support ring moves below the next group of filter bags, the dust shields close again into a cylindrical shape, and the corresponding blowing pipes are controlled to spray compressed air to this group of filter bags;

[0019] The fourth step is to push the sliding plate back to its original position under the elastic action of the No. 1 spring after all the filter bags are cleaned.

[0020] Beneficial effects of the present invention:

[0021] 1. This dust removal system uses a closed cylindrical dust shield to cover the outside of the filter bag during dust cleaning. This can prevent dust from being blown onto other cleaned filter bags and can also play a guiding role, allowing compressed air to drive the dust to flow quickly to the bottom of the dust box for discharge;

[0022] 2. The thrust plate can alternately lift and lower the force-bearing plate during its movement, so that the force-bearing plate can drive the dust shield to automatically open and close, so that the cylindrical dust shield can cover the outside of the filter bag;

[0023] 3. The main box of this dust removal system is divided into two independent spaces by a partition, which can alternately clean the filter bags in the two spaces, so that the dust can still be filtered during cleaning, so that the operation of on-site production equipment will not be affected during dust removal. In addition, the dust discharged from the bottom of the dust exhaust box can be directly transported to the material by technicians through the arrangement of conveying pipelines, thus reducing secondary pollution and effectively reducing visible dust in the on-site treatment area. Moreover, when cleaning begins, it can automatically limit the dust-laden gas from continuing to flow into the space to avoid the continued introduction of dust-laden gas that will affect the cleaning effect. When the cleaning is completed, the restriction can be automatically lifted.

[0024] 4. During the movement of the threaded sleeve, the transmission assembly can drive the clamping protrusions on both sides to alternately engage with the clamping concave blocks on the same side, so that when the threaded sleeve moves to the right, only the dust shield in the front space moves, and when it moves to the left, only the dust shield in the rear space moves;

[0025] 5. The transmission assembly utilizes the structural characteristics of the main clip and the transmission screw threaded connection, so that the main clip can move and rotate at the same time, so as to drive the two lifting plates to move in different directions, thereby making one set of snap-fitting protrusions and snap-fitting recesses engage with each other while the other set of snap-fitting protrusions and snap-fitting recesses are disengaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the main box body of the present invention.

[0028] Figure 3 Schematic cross-sectional structure diagram of the partition of the present invention.

[0029] Figure 4 Schematic diagram of the positional relationship of the clamping concave block of the present invention.

[0030] Figure 5 Schematic diagram of the positional relationship of the connecting shaft of the present invention.

[0031] Figure 6 Schematic structure diagram of the unfolding guide rod of the present invention.

[0032] Figure 7 Schematic diagram of the unfolded state of the dust shield of the present invention.

[0033] Figure 8 Schematic diagram of the positional relationship of the threaded sleeve of the present invention.

[0034] Figure 9 Schematic structure diagram of the clamping convex block of the present invention.

[0035] Figure 10 Schematic diagram of the positional relationship of the transmission lead screw of the present invention.

[0036] Figure 11 Schematic structure diagram of the limiting block of the present invention.

[0037] Figure 12 Schematic diagram of the positional relationship of the blocking door of the present invention.

[0038] Figure 13 Schematic diagram of the connection relationship of the blocking door of the present invention.

[0039] Description of the reference numerals in the drawings: 1 - main box body, 101 - dust exhaust box, 102 - air inlet pipe, 103 - exhaust fan, 104 - fixing plate, 105 - filter bag, 106 - compressed air tank, 107 - blowing pipe, 2 - external housing, 201 - sliding guide rod, 202 - first spring, 203 - sliding plate, 204 - support ring, 205 - hinge shaft, 206 - dust baffle, 3 - middle connecting rod, 301 - unfolding guide rod, 302 - second spring, 303 - connecting shaft, 3031 - unfolding guide rail, 304 - lower connecting rod, 305 - stress plate, 306 - thrust plate, 4 - partition plate, 401 - bidirectional lead screw, 402 - motor, 403 - threaded sleeve, 404 - lifting plate, 405 - clamping projection, 406 - third spring, 407 - clamping recess, 5 - transmission support rod, 501 - transmission guide frame, 502 - transmission lead screw, 503 - main buckle, 504 - transmission gear, 505 - auxiliary buckle, 506 - toothed plate, 507 - fourth spring, 6 - limit block, 601 - limit spring, 602 - limit guide rod, 603 - fifth spring, 604 - limit ejector rod, 7 - dustproof cloth, 8 - driving pulley, 801 - driven pulley, 802 - cam, 803 - vibration connecting rod, 804 - sixth spring, 805 - first transmission belt, 9 - blocking door, 901 - torsion spring, 902 - first gear, 903 - rack, 904 - first pulley, 905 - second gear, 906 - second pulley, 907 - second transmission belt. Detailed implementation mode

[0040] The present invention will be further described below in conjunction with the drawings and the detailed implementation mode.

[0041] Example 1: A micro-power dust removal system applied to the coal preparation system, as Figures 1-5As shown in the figure, it includes a pulse bag filter, an isolation mechanism and an opening and closing mechanism. The pulse bag filter is a prior art. The pulse bag filter includes a main box body 1, a dust discharge box 101, an air inlet pipe 102, a suction fan 103, a fixing plate 104, filter bags 105, a compressed air tank 106 and a blowing pipe 107. The lower side of the main box body 1 is fixedly connected with the dust discharge box 101. An opening for discharging dust is provided at the lower end of the dust discharge box 101. One side of the main box body 1 is fixedly connected with the air inlet pipe 102. The air with dust enters the main box body 1 through the air inlet pipe 102. The other side of the main box body 1 is fixedly connected with the suction fan 103. The suction fan 103 is communicated with the upper side of the main box body 1 through a pipeline. The suction fan 103 is used to extract the air in the main box body 1. A fixing plate 104 is installed in the main box body 1. 18 filter bags 105 for filtering dust are fixedly installed on the fixing plate 104 in an array. The filter bags 105 on each fixing plate 104 are arranged in a 3-horizontal and 6-vertical manner. A compressed air tank 106 is fixedly installed on the main box body 1. 6 blowing pipes 107 are connected to the compressed air tank 106 through electronic pulse valves. The electronic pulse valve is a prior art. 3 nozzles are provided on the blowing pipe 107. The number of nozzles is the same as the number of horizontal rows of the filter bags 105, and each nozzle is aligned with a filter bag 105. The isolation mechanism includes an external shell 2, a sliding guide rod 201, a first spring 202, a sliding plate 203, a support ring 204, a hinge shaft 205 and a dust blocking plate 206. The external shell 2 is fixedly connected to the main box body 1. Two sliding guide rods 201 are symmetrically fixedly connected inside the external shell 2. A first spring 202 is sleeved on the sliding guide rod 201. A sliding plate 203 is slidably connected to the two sliding guide rods 201 together. Three support rings 204 are connected to the sliding plate 203. The adjacent support rings 204 are fixedly connected together. The outermost support ring 204 is fixedly connected to the sliding plate 203. Two hinge shafts 205 are symmetrically fixedly connected to each support ring 204. Two dust blocking plates 206 are rotatably connected to each hinge shaft 205. The four dust blocking plates 206 on the two hinge shafts 205 can be closed into a cylindrical shape. An opening and closing mechanism for controlling the opening and closing of the dust blocking plate 206 so as to cover the outside of the filter bag 105 is connected to the support ring 204.

[0042] During operation, the dusty gas enters the main box body 1 through the air inlet pipe 102 under the action of negative pressure. Coarse dust particles directly fall to the bottom of the dust discharge box 101 and are discharged. Fine dust particles float upward with the airflow, and the dust accumulates on the outer surface of the filter bag 105. The filtered gas is discharged by the exhaust fan. When it is necessary to clean the filter bag 105, control the sliding plate 203 to drive the support ring 204 and the structures thereon to slide along the sliding guide rod 201 to the opposite side, so that the dust baffle 206 gradually approaches the filter bag 105. During this process, the opening and closing mechanism will drive the four dust baffles 206 on the same support ring 204 to unfold. When the support ring 204 moves below the filter bag 105, the four dust baffles 206 close. The closed dust baffle 206 is in a cylindrical shape and covers the outside of the filter bag 105. As can be seen from the figure, there are three groups of dust baffles 206 in each isolation mechanism, that is, three longitudinal filter bags 105 can be covered. Then stop the movement of the sliding plate 203, and control the compressed air tank 106 to blow compressed air into the three filter bags 105 through a corresponding blowing pipe 107, so as to blow the dust on the filter bag 105 down. The dust baffle 206 closed in a cylindrical shape can not only prevent the dust from being blown onto other filter bags 105 that have been cleaned, but also play a guiding role in the blowing airflow, so that the compressed air drives the dust to flow rapidly to the bottom of the dust discharge box 101 for discharge, thereby realizing the dust cleaning treatment for a group of longitudinal filter bags 105. Then continue to move the sliding plate 203, and the opening and closing mechanism will drive the three groups of dust baffles 206 to unfold again to cover the outside of the next group of filter bags 105. When the support ring 204 moves below the next group of filter bags 105, the dust baffle 206 closes again, and then control the compressed air tank 106 to blow compressed air into the three filter bags 105 through a corresponding blowing pipe 107 again. During the process of the sliding plate 203 moving to the opposite side, the dust baffle 206 will successively cover the outside of six groups of longitudinal filter bags 105 and compress the first spring 202. When the cleaning of the last group of filter bags 105 is completed, the compressed first spring 202 pushes the sliding plate 203 to reset.

[0043] As Figures 2-7As shown in the figure, the opening and closing mechanism includes a middle connecting rod 3, a spreading guide rod 301, a second spring 302, a connecting shaft 303, a spreading guide rail 3031, a lower connecting rod 304, a stress plate 305 and a thrust plate 306. Two middle connecting rods 3 are symmetrically and slidably connected to the support ring 204. The middle connecting rod 3 can only slide in the horizontal direction. Two spreading guide rods 301 are symmetrically and slidably connected to the middle connecting rod 3. A second spring 302 is sleeved on the spreading guide rod 301. When the two spreading guide rods 301 on the same middle connecting rod 3 move away from each other, the second spring 302 will be compressed. One end of each spreading guide rod 301 located between the two middle connecting rods 3 is rotatably connected to a connecting shaft 303. Each connecting shaft 303 is fixedly connected to the bottom of a dust shield 206. Four arc-shaped spreading guide rails 3031 are provided on the support ring 204. Each connecting shaft 303 is slidably connected in a spreading guide rail 3031. When the middle connecting rod 3 slides in the horizontal direction, it will drive the connecting shaft 303 to slide in the spreading guide rail 3031 through the spreading guide rod 301. When the connecting shaft 303 slides along the spreading guide rail 3031, it can drive the four dust shields 206 to open or close. Two lower connecting rods 304 are rotatably connected to each middle connecting rod 3. The four lower connecting rods 304 on the two middle connecting rods 3 are jointly rotatably connected to a stress plate 305. A thrust plate 306 is fixedly connected in the main box body 1. The number of the thrust plates 306 is the same as that of the support rings 204, and the thrust plate 306 is arranged below the support ring 204. The upper end of the thrust plate 306 is provided with a protrusion similar to a wavy line. During the movement of the sliding plate 203, the thrust plate 306 will intermittently lift the stress plate 305 upward. When the thrust plate 306 moves upward, it will drive the two middle connecting rods 3 to move away from each other through the lower connecting rods 304. In actual manufacturing, those skilled in the art can add rollers to the stress plate 305 to reduce the friction between the stress plate 305 and the thrust plate 306.

[0044] During the movement of the sliding plate 203 driving the support ring 204, the stress plate 305 will contact the lower thrust plate 306. From the structure of the thrust plate 306, it can be seen that the thrust plate 306 will alternately lift and lower the stress plate 305, that is, the stress plate 305 will alternately move up and down. When the stress plate 305 moves upward, it will drive the two middle connecting rods 3 to move away from each other through the lower connecting rods 304. The middle connecting rod 3 will drive the connecting shaft 303 to slide along the spreading guide rail 3031 through the spreading guide rod 301 to open the dust shield 206. When the stress plate 305 moves downward, it will drive the dust shield 206 to close.

[0045] It further includes a partition plate 4. The partition plate 4 is fixedly connected inside the main box body 1 and the dust exhaust box 101. The partition plate 4 is used to symmetrically divide the space inside the main box body 1 and the dust exhaust box 101. The air flowing into the main box body 1 through the air inlet pipe 102 will also be divided into two parts by the partition plate 4. There are two sets of fixed plates 104, filter bags 105 and compressed air tanks 106 on the pulse bag filter, and the two sets are symmetrically arranged with the partition plate 4 as the axis. There are also two sets of isolation mechanisms and opening and closing mechanisms correspondingly. The two sets of isolation mechanisms and opening and closing mechanisms are arranged in the spaces on both sides of the partition plate 4.

[0046] The space inside the main box body 1 is divided into two independent spaces by the partition plate 4. An isolation mechanism and an opening and closing mechanism are correspondingly arranged in each space. When cleaning the ash, the filter bags 105 on both sides of the partition plate 4 can be cleaned alternately. After the filter bags 105 on one side are cleaned and the sliding plate 203 is reset, then start to clean the filter bags 105 on the other side of the partition plate 4, so as to realize the function of still being able to filter dust when cleaning the filter bags 105, so that the operation of the on-site production equipment will not be affected during dust removal. And for the dust discharged from the bottom of the dust exhaust box 101, technicians can directly transport it into the material by laying a conveying pipeline, reducing secondary pollution and effectively reducing the visible dust in the on-site treatment area.

[0047] Embodiment 2: On the basis of Embodiment 1, as Figure 3 , Figure 4 , Figure 8 and Figure 9As shown in the figure, it further includes a driving mechanism for driving the two groups of isolation mechanisms to move alternately. The driving mechanism is connected to the support ring 204. The driving mechanism includes a bidirectional lead screw 401, a motor 402, a threaded sleeve 403, a lifting plate 404, a clamping convex block 405, a third spring 406, a clamping concave block 407 and a transmission component. The partition plate 4 is composed of a plate structure and a frame structure. A bidirectional lead screw 401 is rotatably connected to the main box body 1. The bidirectional lead screw 401 is located inside the frame structure of the partition plate 4. A motor 402 is fixedly connected to the main box body 1. The output shaft of the motor 402 is fixedly connected to one end of the bidirectional lead screw 401. A threaded sleeve 403 is threadedly connected to the bidirectional lead screw 401, and the threaded sleeve 403 is slidably connected to the partition plate 4 in the horizontal direction, so that the threaded sleeve 403 can move in the horizontal direction during the rotation of the bidirectional lead screw 401. Two lifting plates 404 are symmetrically slidably connected to the threaded sleeve 403 in the front and rear directions. A clamping convex block 405 is slidably connected to the lifting plate 404 in the vertical direction. A third spring 406 is sleeved on the guide rod of the clamping convex block 405. When the clamping convex block 405 moves upward, the third spring 406 will be compressed. Two slideways are symmetrically opened on the frame structure of the partition plate 4. A clamping concave block 407 is slidably connected in the slideway opened on the partition plate 4. The upper end of the clamping concave block 407 extends out of the slideway. The lower side of the clamping concave block 407 is located inside the frame structure of the partition plate 4. The clamping concave block 407 is fixedly connected to one of the support rings 204 in the isolation mechanism on the same side. This support ring 204 is the one closest to the partition plate 4. The clamping convex block 405 and the clamping concave block 407 are inserted and matched. A transmission component is connected to the lifting plate 404. The transmission component is used to drive the two clamping convex blocks 405 to alternately insert with the clamping concave blocks 407 on the same side, so as to alternately drive the two groups of isolation mechanisms to move, enabling the dust removal system to normally filter dust on the other side when cleaning the filter bags 105 on one side.

[0048] When the threaded sleeve 403 is located at the left end of the bidirectional lead screw 401 in the figure shown, the clamping convex block 405 on the front side is in a clamped state with the clamping concave block 407 on the same side; when the motor 402 drives the bidirectional lead screw 401 to rotate, it will drive the front sliding plate 203 to move to the right through the threaded sleeve 403, the clamping convex block 405 and the clamping concave block 407, so as to facilitate the cleaning of the filter bag 105 in the space in front of the partition plate 4. When the cleaning of the front filter bag 105 is completed and the bidirectional lead screw 401 continues to rotate, the threaded sleeve 403 will first continue to move to the right for a certain distance and trigger the transmission component. The transmission component will drive the front clamping convex block 405 to move upward through the front lifting plate 404, so that the front clamping convex block 405 is disengaged from the clamping concave block 407 on the same side. At the same time, it will drive the rear clamping convex block 405 to move downward through the rear lifting plate 404, so that the rear clamping convex block 405 is in clamping cooperation with the clamping concave block 407 on the same side. Then, the front sliding plate 203 slides leftward and resets under the elastic action of the first spring 202; after the front sliding plate 203 is reset to the left and the bidirectional lead screw 401 is continuously controlled to rotate, the bidirectional lead screw 401 starts to drive the rear sliding plate 203 to move to the left through the threaded sleeve 403, the clamping convex block 405 and the clamping concave block 407, so as to facilitate the cleaning of the filter bag 105 in the space behind the partition plate 4. When the cleaning of the rear filter bag 105 is completed and the bidirectional lead screw 401 continues to rotate, the threaded sleeve 403 will first continue to move to the left for a certain distance and trigger the transmission component. The transmission component will drive the rear clamping convex block 405 to move upward through the rear lifting plate 404, so that the rear clamping convex block 405 is disengaged from the clamping concave block 407 on the same side. At the same time, it will drive the front clamping convex block 405 to move downward through the front lifting plate 404, so that the front clamping convex block 405 is in clamping cooperation with the clamping concave block 407 on the same side. The rear sliding plate 203 will slide leftward and reset under the elastic action of the first spring 202.

[0049] Such as Figure 2 , Figure 3 , Figure 8 , Figure 9 , Figure 10 and Figure 11As shown in the figure, the transmission assembly includes a transmission support rod 5, a transmission guide frame 501, a transmission lead screw 502, a main buckle 503, a transmission gear 504, a secondary buckle 505, a toothed plate 506, and a fourth spring 507. Transmission support rods 5 are fixedly connected to the inner walls on both the left and right sides of the main box body 1. The transmission support rods 5 are located within the frame structure of the partition plate 4. Two transmission guide frames 501 are symmetrically and slidably connected to the transmission support rods 5. The fourth spring 507 is sleeved on the transmission guide frames 501. A main buckle 503 is rotatably connected to the two transmission guide frames 501 together. One end of the transmission support rod 5 far from the inner wall of the main box body 1 is fixedly connected to a transmission lead screw 502. The main buckle 503 is threadedly connected to the transmission lead screw 502. When the transmission guide frame 501 slides, the main buckle 503 will rotate under the action of the transmission lead screw 502. A transmission gear 504 and two secondary buckles 505 are rotatably connected to the lifting plate 404 coaxially. The two secondary buckles 505 are located at both ends, and the transmission gear 504 is located in the middle. The secondary buckle 505 and the main buckle 503 are in snap-fit connection. Toothed plates 506 are fixedly connected to the side of the lifting plate 404 close to the transmission gear 504. The two toothed plates 506 are kept meshed with the transmission gear 504. When the main buckle 503 rotates, it will drive the transmission gear 504 to rotate through the secondary buckle 505.

[0050] When the front filter bag 105 has been cleaned and the bidirectional lead screw 401 continues to rotate, the thread sleeve 403 will first continue to move to the right. The secondary buckle 505 on the right side will be docked with the main buckle 503 on the right inner wall of the main box body 1. During the process of the thread sleeve 403 continuing to move to the right, it will squeeze the transmission guide frame 501 through the secondary buckle 505 and the main buckle 503, so that the transmission guide frame 501 and the main buckle 503 move towards the direction close to the right inner wall of the main box body 1, and the fourth spring 507 will be compressed. Since the main buckle 503 is threadedly connected to the transmission lead screw 502, the main buckle 503 will rotate while moving, thereby driving the transmission gear 504 to rotate through the secondary buckle 505, and then driving the front lifting plate 404 to move upward through the toothed plate 506 and driving the rear lifting plate 404 to move downward; when the rear filter bag 105 has been cleaned and the bidirectional lead screw 401 continues to rotate, the thread sleeve 403 will first continue to move to the left. During this process, it will drive the rear lifting plate 404 to move upward and the front lifting plate 404 to move downward through the cooperation of the main buckle 503, the secondary buckle 505, and the transmission lead screw 502. The working principle of the transmission assembly in this process is similar to that described above, and will not be elaborated here.

[0051] As Figure 2 、 Figure 3 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11As shown, it further includes a limiting mechanism for restricting the movement of the lifting plate 404. The limiting mechanism is connected to the lifting plate 404 and includes a limiting block 6, a limiting spring 601, a limiting guide rod 602, a fifth spring 603, and a limiting ejector rod 604. The lower side of the lifting plate 404 is hook-shaped. Two limiting blocks 6 are symmetrically and slidably connected to the threaded sleeve 403. A limiting spring 601 is sleeved on the guide rod on which the limiting block 6 slides. The limiting block 6 is used to block the lower side of the lifting plate 404 to restrict its movement. Limiting guide rods 602 are fixedly connected to the inner walls on both the left and right sides of the main box body 1. A fifth spring 603 is sleeved on the limiting guide rod 602. The elastic force of the fifth spring 603 is greater than that of the limiting spring 601. A limiting ejector rod 604 is slidably connected to the side of the limiting guide rod 602 away from the inner wall of the main box body 1. The limiting ejector rod 604 is used to push the limiting block 6 away from the lower side of the lifting plate 404.

[0052] When the threaded sleeve 403 pushes the transmission guide frame 501 and the main buckle 503 close to the inner wall of the main box body 1, the No. 4 spring 507 is compressed. Therefore, when the threaded sleeve 403 moves in the direction away from the inner wall of the main box body 1, the No. 4 spring 507 tends to push the transmission guide frame 501 to reset, while the main buckle 503 and the auxiliary buckle 505 are still in the clamping state. If the transmission guide frame 501 is reset at this time, the main buckle 503 will be reversed, and the lifting plate 404 will be driven to reset through the auxiliary buckle 505, the transmission gear 504 and the tooth plate 506, thereby guiding The second limit switch 505 is used to limit the movement of the lifting plate 404, so the second limit switch 505 and the second limit switch 503 are used to limit the movement of the lifting plate 404. The second limit switch 505 is used to limit the movement of the lifting plate 404, so the second limit switch 505 is used to limit the movement of the lifting plate 404, so the second limit switch 505 is used to limit the movement of the lifting plate 404, so the second limit switch 505 is used to limit the movement of the lifting plate 404, so the second limit switch 505 is used to limit the movement of the lifting plate 404, so the second limit switch 505 is used to limit the movement of the lifting plate 404, The rod 604 will first press against the limit block 6 on the front side of the threaded sleeve 403, so that when the threaded sleeve 403 continues to move to the right, the limit block 6 will be disengaged from the lifting plate 404 on the front side, and the limit spring 601 will be compressed, so that the transmission assembly can drive the lifting plate 404 on the front side to move upward. When the limit block 6 is disengaged from the lifting plate 404, the limit spring 601 is fully compressed. At this time, when the threaded sleeve 403 continues to move to the right to drive the transmission assembly, the threaded sleeve 403 will push the limit push rod 604 through the limit block 6 and move the No. 5 When the spring 603 is compressed and the transmission assembly drives the rear lifting plate 404 to move downward, the rear lifting plate 404 will squeeze the limit block 6 on the same side through the inclined surface. When the clamping position of the lifting plate 404 is at the same height as the limit block 6, the No. 5 spring 603 pushes the limit block 6 to reset to limit the movement of the rear lifting plate 404; when the rear filter bag 105 is cleaned and the bidirectional screw 401 continues to rotate, the threaded sleeve 403 will continue to move to the left first. The working principle of the limiting mechanism in this process is similar to that mentioned above and will not be repeated here.

[0053] like Figure 3 、 Figure 4 and Figure 8 As shown, it also includes a dustproof cloth 7 for preventing dust from entering the partition 4. Two ends of the dustproof cloth 7 are symmetrically fixed on the snap-fit recess 407, and the other end of the dustproof cloth 7 is fixed to the partition 4. The dustproof cloth 7 is located in a slide opened on the partition 4, and the dustproof cloth 7 is a foldable structure similar to a curtain.

[0054] The dustproof cloth 7 can be provided to prevent dust from entering the interior through the slideway provided on the partition 4, thereby preventing dust from accumulating in the partition 4 and affecting the normal operation of the mechanical structure.

[0055] Example 3: Based on Example 2,Figure 2 and Figure 3 As shown in Figures 1-3 As shown, it further includes a shaking mechanism for driving the shaking of the filter bag 105. The shaking mechanism is connected to the lead screw. The shaking mechanism includes a driving pulley 8, a driven pulley 801, a cam 802, a vibrating connecting rod 803, a sixth spring 804, and a first transmission belt 805. Two driving pulleys 8 are symmetrically fixed on the bidirectional lead screw 401. The driving pulleys 8 are located outside the main body 1. Two groups of driven pulleys 801 and cams 802 are rotatably connected to the outer wall of the main body 1. The driven pulley 801 and the cam 802 in the same group are coaxially arranged. The driven pulley 801 and the driving pulley 8 on the same side are jointly wound with a first transmission belt 805. A plurality of protrusions are annularly arranged on the cam 802. The fixing plate 104 is slidably connected to the inner wall of the main body 1, and a sixth spring 804 is sleeved on the fixing plate 104. When the fixing plate 104 moves upward, the sixth spring 804 will be compressed. A vibrating connecting rod 803 is fixed on each fixing plate 104. The vibrating connecting rod 803 extends outwards from the inside of the main body 1. When the cam 802 rotates, it will intermittently push the fixing plate 104 upward through the vibrating connecting rod 803.

[0056] When the bidirectional lead screw 401 rotates, it will drive the cam 802 to rotate through the driving pulley 8, the first transmission belt 805, and the driven pulley 801. When the cam 802 rotates, it will intermittently push the fixing plate 104 upward through the vibrating connecting rod 803, and with the cooperation of the sixth spring 804, the effect of driving the fixing plate 104 to vibrate is achieved, so that the compressed air can better clean the dust on the filter bag 105.

[0057] As shown in Figure 2 , Figure 12 and Figure 13 As shown, it further includes a blocking mechanism for making the dust-containing gas flow only to one side of the partition plate 4. The blocking mechanism is connected to the support ring 204. The blocking mechanism includes a blocking door 9, a torsion spring 901, a first gear 902, a rack 903, a first pulley 904, a second gear 905, a second pulley 906, and a second transmission belt 907. Two blocking doors 9 are rotatably connected symmetrically on the air inlet pipe 102. The two blocking doors 9 are respectively located on both sides of the partition plate 4, and the blocking door 9 is located inside the main body 1. A torsion spring 901 is sleeved on the rotating shaft of the blocking door 9. The two ends of the torsion spring 901 are fixed to the rotating shaft of the blocking door 9 and the air inlet pipe 102. The torsion spring 901 is used to drive the blocking door 9 to close. A first gear 902 is fixed to the rotating shaft of the front blocking door 9. A rack 903 is fixed to each support ring 204 in each isolation mechanism. A first pulley 904 is fixed to the rotating shaft of the rear blocking door 9. A second gear 905 and a second pulley 906 are coaxially rotatably connected to the inner wall at the rear of the main body 1. The first pulley 904 and the second pulley 906 are jointly wound with a second transmission belt 907.

[0058] During the process of the front sliding plate 203 and the support ring 204 moving rightward, the rack 903 on the support ring 204 will drive the first gear 902 to rotate to close the front blocking door 9, so that the dust-containing gas no longer enters the space in front of the partition plate 4. When the rack 903 and the first gear 902 are disengaged, the blocking door 9 will remain closed under the action of the torsion spring 901. During the process of the front sliding plate 203 resetting leftward, the rack 903 will drive the blocking door 9 to open through the first gear 902, and the torsion spring 901 will be energized; during the process of the rear sliding plate 203 and the support ring 204 moving leftward, the rack 903 on the support ring 204 will drive the second gear 905 to rotate, and close the rear blocking door 9 through the first pulley 904 and the second pulley 906. During the process of the rear sliding plate 203 and the support ring 204 resetting rightward, the rear blocking door 9 will be driven to open through the rack 903, the second gear 905, the first pulley 904, the second transmission belt 907 and the second pulley 906; when the filter bags 105 are not being cleaned, both blocking doors 9 are in the open state, enabling the dust removal system to filter dust with the highest efficiency. When cleaning one side of the filter bags 105, the blocking door 9 on the same side can automatically close to prevent the continuous introduction of dust-containing gas from affecting the cleaning effect, and the blocking door 9 on the other side can remain open, enabling the dust removal system to continuously filter the dust-containing gas.

[0059] A dust removal method for a micro-power dust removal system applied to a coal preparation system specifically includes the following steps:

[0060] In the first step, when dust cleaning is required, the sliding plate 203 slides along the sliding guide rod 201. During this process, the opening and closing mechanism will first drive the four dust baffle plates 206 on the support ring 204 to unfold. When the support ring 204 moves below the filter bags 105, the four dust baffle plates 206 close into a cylindrical shape, and the dust baffle plates 206 cover the filter bags 105. At this time, the sliding plate 203 is stopped.

[0061] In the second step, control the corresponding blowing pipe 107 to blow compressed air into the filter bags 105 to blow the dust off the filter bags 105.

[0062] In the third step, control the sliding plate 203 to continue moving. The four dust baffle plates 206 on the same support ring 204 unfold and move to the position of the next group of filter bags 105. When the support ring 204 moves below the next group of filter bags 105, the dust baffle plates 206 close into a cylindrical shape again, and control the corresponding blowing pipe 107 to blow compressed air into this group of filter bags 105.

[0063] In the fourth step, after all the filter bags 105 are cleaned of dust, the sliding plate 203 is pushed to reset under the elastic action of the first spring 202.

[0064] The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present invention.

Claims

1. A micro-power dust removal system applied to a coal preparation system, comprising a pulse bag filter, the pulse bag filter including a main box body (1), a dust discharge box (101), an air inlet pipe (102), a fixing plate (104), filter bags (105), a compressed air tank (106) and a blowpipe (107), characterized in that, It further includes an isolation mechanism and an opening / closing mechanism. The isolation mechanism includes an external housing (2), a sliding guide rod (201), a first spring (202), a sliding plate (203), a support ring (204), a hinge shaft (205), and a dust shield (206). The external housing (2) is fixedly connected to the main box body (1). A sliding plate (203) is slidably connected to the sliding guide rod (201) inside the external housing (2). The first spring (202) is sleeved on the sliding guide rod (201). A support ring (204) is fixedly connected to the sliding plate (203). A plurality of dust shields (206) are rotatably connected to the support ring (204) through the hinge shaft (205). The plurality of dust shields (206) can be closed into a cylindrical shape to prevent dust from scattering. An opening / closing mechanism for controlling the opening and closing of the dust shields (206) to facilitate covering the outside of the filter bag (105) is connected to the support ring (204). The opening / closing mechanism includes a middle connecting rod (3), a developing guide rod (301), a second spring (302), a connecting shaft (303), a developing guide rail (3031), a lower connecting rod (304), a force-receiving plate (305), and a thrust plate (306). Two middle connecting rods (3) are symmetrically and slidably connected to the support ring (204). Two developing guide rods (301) are symmetrically and slidably connected to the middle connecting rod (3). The second spring (302) is sleeved on the developing guide rod (301). A connecting shaft (303) is rotatably connected to the developing guide rod (301). Each connecting shaft (303) is fixedly connected to a dust shield (206). The connecting shaft (303) is slidably connected to the developing guide rail (3031) opened on the support ring (204). When the middle connecting rod (3) slides, it will drive the connecting shaft (303) to slide in the developing guide rail (3031). When the connecting shaft (303) slides along the developing guide rail (3031), it can drive the plurality of dust shields (206) to unfold or close. One end of a lower connecting rod (304) is rotatably connected to the middle connecting rod (3), and the other end of the lower connecting rod (304) is rotatably connected to the force-receiving plate (305). The thrust plate (306) is fixedly connected to the inside of the main box body (1). During the movement of the sliding plate (203), the thrust plate (306) will intermittently push the force-receiving plate (305) upward to drive the middle connecting rod (3) to slide through the lower connecting rod (304).

2. The micro-power dust removal system applied to the coal preparation system according to claim 1, characterized in that, It further includes a partition plate (4). The partition plate (4) is fixedly connected to the inside of the main box body (1) and the dust discharging box (101). The partition plate (4) is used to symmetrically divide the internal space of the main box body (1) and the dust discharging box (101). There are two groups each of the fixing plate (104), the filter bag (105), and the compressed air tank (106) on the pulse bag filter. The isolation mechanism and the opening / closing mechanism are also provided in two groups correspondingly.

3. The micro-power dust removal system applied to the coal preparation system according to claim 2, wherein, It further includes a driving mechanism for driving the two groups of isolation mechanisms to move alternately. The driving mechanism is connected to the support ring (204). The driving mechanism includes a bidirectional lead screw (401), a motor (402), a threaded sleeve (403), a lifting plate (404), a clamping projection (405), a third spring (406), a clamping recess (407) and a transmission assembly. A motor (402) for driving the bidirectional lead screw (401) to rotate is fixedly connected to the main box body (1). The bidirectional lead screw (401) is rotatably connected to the main box body (1) and is located inside the partition plate (4). The threaded sleeve (403) is threadedly connected to the bidirectional lead screw (401). Two lifting plates (404) are slidably connected to the threaded sleeve (403). A clamping projection (405) is slidably connected to the lifting plate (404). The third spring (406) is sleeved on the guide rod of the clamping projection (405). The clamping recess (407) is slidably connected to the partition plate (4). The lower side of the clamping recess (407) is located inside the partition plate (4). The clamping recess (407) is fixedly connected to the support ring (204) on the same side. The clamping projection (405) and the clamping recess (407) are inserted and matched. A transmission assembly is connected to the lifting plate (404). The transmission assembly is used to drive the two clamping projections (405) to alternately insert into the clamping recesses (407) on the same side, so as to alternately drive the two groups of isolation mechanisms to move.

4. The micro-power dust removal system applied to the coal preparation system according to claim 3, characterized in that, The transmission assembly includes a transmission support rod (5), a transmission guide frame (501), a transmission lead screw (502), a main buckle (503), a transmission gear (504), a secondary buckle (505), a toothed plate (506) and a fourth spring (507). Transmission support rods (5) are fixedly connected to the inner walls on the left and right sides of the main box body (1). The transmission guide frame (501) is slidably connected to the transmission support rod (5). The fourth spring (507) is sleeved on the transmission guide frame (501). The main buckle (503) is rotatably connected to the transmission guide frame (501). The transmission lead screw (502) is fixedly connected to the transmission support rod (5). The main buckle (503) is threadedly connected to the transmission lead screw (502). A transmission gear (504) and two secondary buckles (505) are coaxially rotatably connected to the lifting plate (404). The secondary buckle (505) and the main buckle (503) are clamped and matched. The toothed plate (506) is fixedly connected to the lifting plate (404). The toothed plate (506) and the transmission gear (504) are kept in mesh.

5. The micro-power dust removal system applied to the coal preparation system according to claim 4, wherein It also includes a limit mechanism for restricting the movement of the lifting plate (404). The limit mechanism is connected to the lifting plate (404) and includes a limit block (6), a limit spring (601), a limit guide rod (602), a fifth spring (603), and a limit ejector rod (604). Two limit blocks (6) for restricting the movement of the lifting plate (404) are slidably connected to the threaded sleeve (403). A limit spring (601) is sleeved on the guide rod where the limit block (6) slides. Limit guide rods (602) are fixedly connected to the inner walls on both the left and right sides of the main box body (1). A fifth spring (603) is sleeved on the limit guide rod (602). A limit ejector rod (604) is slidably connected to the limit guide rod (602), and the limit ejector rod (604) is used to separate the limit block (6) from the lifting plate (404).

6. The micro-power dust removal system applied to the coal preparation system according to claim 3, characterized in that, It also includes a dust-proof cloth (7) for preventing dust from entering the partition (4). One end of the dust-proof cloth (7) is fixedly connected to the clamping concave block (407), and the other end of the dust-proof cloth (7) is fixedly connected to the partition (4). The dust-proof cloth (7) is located in the slideway of the clamping concave block (407).

7. The micro-power dust removal system applied to the coal preparation system according to claim 3, characterized in that, It also includes a shaking mechanism for driving the filter bag (105) to shake. The shaking mechanism is connected to the lead screw and includes a driving pulley (8), a driven pulley (801), a cam (802), a vibration connecting rod (803), a sixth spring (804), and a first transmission belt (805). The driving pulley (8) is fixedly connected to the bidirectional lead screw (401). The driven pulley (801) and the cam (802) are coaxially rotatably connected to the main box body (1). The driven pulley (801) and the driving pulley (8) on the same side are jointly wound with the first transmission belt (805). The sixth spring (804) is sleeved on the fixing plate (104), and the vibration connecting rod (803) is fixedly connected to the fixing plate (104). When the cam (802) rotates, it will intermittently lift the fixing plate (104) upward through the vibration connecting rod (803).

8. The micro-power dust removal system applied to the coal preparation system according to claim 3, characterized in that, It also includes a blocking mechanism for enabling the dust-containing gas to only flow to one side of the partition (4). The blocking mechanism is connected to the support ring (204) and includes a blocking door (9), a torsion spring (901), a first gear (902), a rack (903), a first pulley (904), a second gear (905), a second pulley (906), and a second transmission belt (907). Two blocking doors (9) are rotatably connected to the air inlet pipe (102). The two blocking doors (9) are respectively located on both sides of the partition (4). A torsion spring (901) is connected between the blocking door (9) and the air inlet pipe (102). The first gear (902) is fixedly connected to the front blocking door (9). A rack (903) is fixedly connected to each support ring (204) in each isolation mechanism. The first pulley (904) is fixedly connected to the upper part of the rear blocking door (9). The second gear (905) and the second pulley (906) are coaxially rotatably connected to the inner wall of the main box body (1). The first pulley (904) and the second pulley (906) are jointly wound with the second transmission belt (907).

9. A dust removal method for a micro-power dust removal system applied to a coal preparation system, characterized in that, A dust removal method for a micro-power dust removal system applied to a coal preparation system according to any one of claims 1-8, specifically including the following steps: In the first step, when dust cleaning is required, the sliding plate (203) slides along the sliding guide rod (201). During this process, the opening and closing mechanism will first drive the multiple dust baffle plates (206) on the support ring (204) to unfold. When the support ring (204) moves below the filter bag (105), the multiple dust baffle plates (206) are closed into a cylindrical shape, and the dust baffle plates (206) cover the filter bag (105). At this time, the sliding plate (203) is stopped; In the second step, the corresponding blowpipe (107) is controlled to blow compressed air into the filter bag (105) to blow the dust off the filter bag (105); In the third step, the sliding plate (203) is controlled to continue moving, the multiple dust baffle plates (206) on the same support ring (204) unfold, and move to the position of the next group of filter bags (105). When the support ring (204) moves below the next group of filter bags (105), the dust baffle plates (206) are closed into a cylindrical shape again, and the corresponding blowpipe (107) is controlled to blow compressed air into this group of filter bags (105); In the fourth step, after all the filter bags (105) are cleaned of dust, the sliding plate (203) is pushed to reset under the elastic action of the first spring (202).

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