Bag-type dust collector for feed premixing

Abstract

The utility model relates to a bag-type dust collector for feed premixing, which comprises a cylinder body, a dust hopper fixedly communicated with the bottom of the cylinder body and a clean air cylinder arranged at the top of the cylinder body in a liftable manner, an air tank and an air pump are arranged at the outer top of the clean air cylinder, a hollow air distribution disc is arranged at the inner top of the clean air cylinder, an air inlet of the air pump is communicated with an air outlet of the air tank, and an air outlet is communicated with the side part of the air distribution disc. The bottom of the gas distribution disc is fixedly connected with a partition plate through a plurality of supporting rods, a plurality of mounting plates are arranged at the bottom of the partition plate, a cloth bag is arranged below the mounting plates, the cloth bag is cylindrical, the bottom of the cloth bag is closed, the top of the cloth bag is open, the cloth bag is coaxially and fixedly connected with a fixing plate, the fixing plate is detachably connected with the mounting plates, and through holes are coaxially formed in the fixing plate, the mounting plates and the corresponding partition plate. A second hydraulic cylinder is vertically and fixedly arranged at the bottom of the gas distribution disc corresponding to the through hole, and a piston rod of the second hydraulic cylinder is downwards and fixedly connected with a gas spraying barrel. According to the utility model, the cloth bag can be conveniently disassembled, assembled and replaced, and the cloth bag can be subjected to comprehensive, efficient and high-quality back flushing and flapping dust removal, so that the device is more practical.

Description

Technical Field

[0001] The utility model belongs to the technical field of feed production, and in particular relates to a bag dust collector used in feed premixing. Background Art

[0002] The current feed production process primarily involves receiving and storing raw materials, cleaning (removing impurities), crushing, batching, mixing, pelleting, cooling, crushing, grading, and packaging, storage, and distribution of finished products. During raw material mixing, raw materials with an addition ratio of less than 0.2% are typically premixed and placed in premix bags to ensure uniform mixing of all raw materials. This premixing process often generates dust, requiring dust removal. Common dust removal equipment includes bag filters. However, conventional bag filters are cumbersome and inconvenient to install and remove, making it difficult to easily replace damaged bags. Furthermore, the nozzle height during backflush cleaning is fixed, limiting the length of the nozzle into the bag. This results in a short compressed air jet distance and low jet intensity, resulting in low cleaning efficiency and quality, which needs improvement. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a bag dust collector for feed premixing, which can realize convenient disassembly and replacement of the bags and comprehensive, efficient and high-quality backblowing and beating cleaning of the bags to solve the above problems.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a bag dust collector for feed premixing, comprising a cylinder, an ash hopper fixedly connected to the bottom of the cylinder and a clean air cylinder arranged at the top of the cylinder, the lower part of one side of the cylinder is connected to an air inlet pipe, the upper parts of the left and right sides are fixedly mounted with a vertically arranged first hydraulic cylinder, the top is open, the top of the clean air cylinder is closed, the bottom is open and a flange is fixedly provided, the piston rod of the first hydraulic cylinder is upward and fixedly connected to the flange, an air tank and an air pump are fixedly provided on the outer top of the clean air cylinder, a hollow air distribution plate is fixedly provided on the inner top, and the air inlet of the air pump is connected to the air outlet of the air tank. The air outlet is connected to the side of the air distribution plate, and the bottom of the air distribution plate is fixedly connected to a partition through a number of support rods. When the flange abuts against the top of the cylinder, the partition extends into the cylinder and abuts against the inner side wall of the cylinder. A number of evenly spaced mounting plates are fixed to the bottom of the partition, and positioning grooves are provided on the left and right sides of the bottom of the mounting plate. Electric push rods are embedded on the left and right sides of the mounting plate, and the telescopic end of the electric push rod faces the side away from the mounting plate and is fixedly connected to an L-shaped limiting plate. The horizontal part of the limiting plate faces the mounting plate and its corresponding side of the mounting plate is provided with a first through groove that is connected to the adjacent positioning groove. , a blind groove is provided on the groove wall on the other side of the positioning groove corresponding to the first through groove, and a cloth bag is provided under the mounting plate, and the cloth bag is cylindrical and its bottom is closed, the top is open and is coaxially fixedly connected to the fixing plate, and positioning blocks are fixed on the left and right sides of the top of the fixing plate, and the fixing plate abuts against the bottom of the corresponding mounting plate, and the positioning blocks correspond to the positioning grooves on the same side and are plugged in, and a second through groove is provided at the position corresponding to the first through groove of the positioning block, and the horizontal part of the limiting plate can pass through the corresponding first through groove and the second through groove and be plugged in the corresponding blind groove, and the fixing plate, the mounting plate and the corresponding partition are all coaxial. A through hole is provided, and a second hydraulic cylinder is vertically fixed on the bottom of the air distribution disk corresponding to the through hole. The piston rod of the second hydraulic cylinder faces downward and is fixedly connected to a jet cylinder. The jet cylinder is coaxial with the corresponding through hole and can extend into the corresponding cloth bag through the corresponding through hole. The top of the jet cylinder is connected to the bottom of the air distribution disk through a hose. A plurality of jet holes are provided on the side and bottom of the jet cylinder. A plurality of third hydraulic cylinders are horizontally penetrated and fixed on the side of the jet cylinder at intervals up and down. The piston rods of the third hydraulic cylinder face different directions around the jet cylinder and are fixedly connected to a beating ball. One side of the clean air cylinder is connected to an exhaust pipe.

[0005] Preferably, an inverted L-shaped guide plate is fixedly provided on the inner side wall of the cylinder corresponding to the air inlet pipe, and the vertical part of the guide plate corresponds to the air inlet pipe.

[0006] Preferably, a sealing gasket is fixed on the top of the cylinder.

[0007] Preferably, the air outlet of the gas tank is connected to the air inlet of the air pump through an air pipe with a flow regulating valve.

[0008] Preferably, the mounting plate is adapted to the corresponding fixing plate.

[0009] Preferably, the positioning block is adapted to the corresponding positioning groove.

[0010] Preferably, the horizontal portion of the limiting plate is adapted to the corresponding first through slot, second through slot and blind slot.

[0011] Preferably, it also includes a dust collection main pipe and an exhaust fan, two dust collection branch pipes are connected in parallel at the tail end of the dust collection main pipe, two suction pipes are connected in parallel at the air inlet of the exhaust fan, and gate valves are provided on the two dust collection branch pipes and the two suction pipes. There are two groups of bag dust collectors, the two dust collection branch pipes correspond one-to-one to the two groups of bag dust collectors and are connected to the air inlet pipes of the corresponding bag dust collectors, and the two suction pipes correspond one-to-one to the two groups of bag dust collectors and are connected to the exhaust pipes of the corresponding bag dust collectors.

[0012] The beneficial effects of the present invention are as follows: during pre-mixed dust removal, the dust gas can enter the cylinder through the air inlet pipe, and then flow downward under the guidance of the guide plate, causing the larger dust particles to fall into the ash hopper due to their own gravity. Then, the dust gas flows from bottom to top and passes through multiple bags from outside to inside, so that the smaller dust particles are filtered to the outer side of the bags. The purified air enters the clean air cylinder through the through hole and is discharged through the exhaust pipe, thus achieving bag dust removal. When the bags need to be cleaned, the air pump is turned on. Under the pumping of the air pump, the compressed air stored in the gas tank can be first pumped into the air distribution plate, and then the compressed air is diverted to the jet cylinder through the hose and ejected through the jet hole. At the same time, the second hydraulic cylinder and the third hydraulic cylinder are in motion, and the extension and retraction of the piston rod of the second hydraulic cylinder can drive the jet barrel as a whole to move back and forth in the bag, thereby better ensuring the effective distance range and overall strength of the compressed air jet, and thus being able to cooperate to achieve a more comprehensive, efficient and high-quality back-blowing cleaning treatment of the bag. The extension and retraction of the piston rods of multiple third hydraulic cylinders can drive the corresponding beating balls to continuously beat the bag from multiple directions around the bag, which can cooperate to achieve a comprehensive beating and cleaning treatment of the bag, and cooperate with the back-blowing cleaning to effectively improve the overall efficiency and quality of the bag cleaning, which is more practical.

[0013] When a bag is damaged and needs to be replaced, the first hydraulic cylinder can be operated to extend its piston rod, which can drive the entire air cleaning cylinder upward until the bag is completely moved out of the cylinder. Then, the electric push rod corresponding to the bag to be replaced is operated to extend its telescopic end, which drives the limit plate away from the mounting plate until the horizontal part of the limit plate is pulled out of the second through slot. The plug-in fixation of the positioning block can be released, and the positioning block can be pulled out to remove the original bag. Then, after taking out the new bag, the fixing plate on it can be aligned with the corresponding mounting plate and the positioning block can be aligned with the corresponding positioning slot and inserted into the position. Then, the corresponding electric push rod can be operated to retract its telescopic end, which drives the limit plate closer to the mounting plate until the horizontal part of the limit plate passes through the corresponding first through slot and second through slot and is inserted into the corresponding blind slot. The positioning block is inserted and fixed, and the fixed installation of the new bag is completed. The installation is stable and does not affect subsequent use. After that, the first hydraulic cylinder is operated again to retract its piston rod, pressing the clean air cylinder back onto the cylinder body, and the clean air cylinder can be used again. In this way, the individual bags can be flexibly and conveniently disassembled and replaced independently, making the operation simpler and the overall use more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the bag dust collector of the utility model;

[0015] Figure 2 This is a schematic diagram of the main structure of the utility model when the air cleaning cylinder is raised;

[0016] Figure 3 This is a schematic diagram of the main structure of the utility model when the partition and the cloth bag are connected;

[0017] Figure 4 This is a schematic diagram of the main structure of the partition of the utility model;

[0018] Figure 5 This is a schematic diagram of the main structure of the cloth bag of the utility model;

[0019] Figure 6 This is a schematic diagram of the top view of the cloth bag of the utility model;

[0020] Figure 7 This is a schematic diagram of the main structure of the second hydraulic cylinder and the air jet cylinder of the utility model;

[0021] Figure 8 It is a main structural diagram of the present utility model.

[0022] 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85 DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] like Figures 1 to 8As shown, a bag filter for feed premixing comprises a cylinder 1, an ash hopper 2 fixedly connected to the bottom of the cylinder 1, and a clean air cylinder 3 mounted on the top of the cylinder 1. An air inlet pipe 4 is connected to the lower portion of one side of the cylinder 1. A vertically mounted first hydraulic cylinder 5 is fixedly mounted on the upper portions of both left and right sides of the cylinder 1. The top of the clean air cylinder 3 is open. The top is closed, the bottom is open, and a flange 6 is fixedly mounted. The piston rod of the first hydraulic cylinder 5 faces upward and is fixedly connected to the flange 6. An air tank 7 and an air pump 8 are fixedly mounted on the outer top of the clean air cylinder 3. A hollow air distribution plate 9 is fixedly mounted on the inner top. The air inlet of the air pump 8 is connected to the air outlet of the air tank 7, and the air outlet is connected to the side of the air distribution plate 9. A partition 11 is fixedly connected to the bottom of the air distribution plate 9 via a plurality of support rods 10. When the flange 6 abuts the top of the cylinder 1, the partition 11 extends into the cylinder 1 and abuts against the inner wall of the cylinder 1. A number of evenly spaced mounting plates 12 are fixed to the bottom of the partition 11, and positioning grooves 13 are provided on the left and right sides of the bottom of the mounting plate 12. Electric push rods 14 are embedded on the left and right sides of the mounting plate 12. The telescopic end of the electric push rod 14 faces the side away from the mounting plate 12 and is fixedly connected to an L-shaped limit plate 15. The horizontal part of the limit plate 15 faces the mounting plate 12 and the corresponding side of the mounting plate 12 is provided with a first through groove 16 that is connected to the adjacent positioning groove 13, and a blind groove 17 is provided on the groove wall on the other side of the positioning groove 13 corresponding to the first through groove 16. A cloth bag 18 is located below the mounting plate 12. This cylindrical bag 18 has a closed bottom and an open top, and is coaxially fixedly connected to a fixing plate 19. Positioning blocks 20 are fixed to the left and right sides of the top of the fixing plate 19. The fixing plate 19 abuts the bottom of the corresponding mounting plate 12. The positioning blocks 20 correspond to and engage with the positioning slots 13 on the same side. A second through-slot 21 is defined in the positioning block 20 at the position corresponding to the first through-slot 16. The horizontal portion of the limiting plate 15 can pass through the corresponding first through-slot 16 and second through-slot 21 and engage with the corresponding blind slot 17. A through-hole 22 is coaxially defined in the fixing plate 19, the mounting plate 12, and the corresponding partition 11. A second hydraulic cylinder 23 is vertically fixed to the bottom of the air distribution disk 9 corresponding to the through-hole 22. The piston rod of the second hydraulic cylinder 23 faces downward and is fixedly connected to a jet nozzle 24. The jet nozzle 24 is coaxial with the corresponding through-hole 22 and can extend through the corresponding through-hole 22 into the corresponding cloth bag 18. The top of the air jet cylinder 24 is connected to the bottom of the air distribution disk 9 via a hose 25. Several air jet holes 26 are provided on the sides and bottom of the air jet cylinder 24. A number of third hydraulic cylinders 27 are fixedly mounted horizontally through the side of the air jet cylinder 24, spaced vertically apart. The piston rods of these third hydraulic cylinders 27 face different directions around the air jet cylinder 24 and are each fixedly connected to a beating ball 28. An exhaust pipe 29 is connected to one side of the clean air cylinder 3.

[0025] During premixed dust removal, the dusty gas enters the cylinder 1 through the air inlet pipe 4 and then flows downward under the guidance of the guide plate 30, causing the larger dust particles to fall into the ash hopper 2 under their own gravity. The ash hopper 2 can be made of existing technology. The dusty gas then flows from bottom to top and passes through multiple bags 18 from outside to inside, so that the smaller dust particles are filtered onto the outer side of the bags 18. The purified air enters the clean air cylinder 3 through the through hole and is discharged through the exhaust pipe 29, completing the bag dust removal. When the bags need to be cleaned, the air pump 8 is operated. Under the pumping of the air pump 8, the compressed air stored in the air tank 7 is first pumped into the air distribution plate 9. The compressed air is then diverted to the air injection cylinder 24 through the hose 25 and ejected through the air injection hole 26. At the same time, the second hydraulic cylinder 23 and the third hydraulic cylinder 27 are in motion, and the extension and retraction of the piston rod of the second hydraulic cylinder 23 can drive the jet tube 24 to rise and fall back as a whole in the cloth bag 18, thereby better ensuring the effective distance range and overall strength of the compressed air jet, and thus being able to cooperate to achieve a more comprehensive, efficient and high-quality back-blowing cleaning process for the cloth bag 18, and the extension and retraction of the piston rods of multiple third hydraulic cylinders 27 can drive the corresponding beating balls 28 to continuously beat the cloth bag 18 from multiple directions around the cloth bag 18, which can cooperate to achieve a comprehensive beating and cleaning process for the cloth bag 18, and cooperate with the back-blowing cleaning to effectively and greatly improve the overall efficiency and quality of the cloth bag cleaning, which is more practical.

[0026] When the bag 18 is damaged and needs to be replaced, the first hydraulic cylinder 5 can be operated to extend its piston rod, thereby driving the entire air cleaning cylinder 3 to move upward until the bag 18 is completely moved up and out of the cylinder body 1. Then, the electric push rod 14 corresponding to the bag 18 to be replaced is operated to extend its telescopic end, driving the limit plate 15 away from the mounting plate 12 until the horizontal portion of the limit plate 15 is pulled out of the second through slot 21, thereby releasing the insertion and fixing of the positioning block 20. Then, the positioning block 20 can be pulled out to remove the original bag 18. Next, after taking out the new cloth bag 18, you can first align the fixing plate 19 on it with the corresponding mounting plate 12 and abut it in place, and align the positioning block 20 with the corresponding positioning groove 13 and insert it into place, then operate the corresponding electric push rod 14 to retract its telescopic end, drive the limit plate 15 close to the mounting plate 12, until the horizontal part of the limit plate 15 successively passes through the corresponding first through groove 16 and second through groove 21 and is inserted into the corresponding blind groove 17, insert and fix the positioning block 20, and the fixed installation of the new cloth bag 18 is completed. The installation is stable and does not affect subsequent use. Afterwards, operate the first hydraulic cylinder 5 again to retract its piston rod, press the clean air cylinder 3 back onto the cylinder body 1, and then continue to use it. In this way, a single cloth bag 18 can be flexibly and conveniently disassembled and replaced independently, making the operation simpler and the overall use more flexible and convenient.

[0027] In this embodiment, an inverted L-shaped guide plate 30 is fixedly provided on the inner side wall of the cylinder 1 corresponding to the air inlet pipe 4 . The vertical portion of the guide plate 30 corresponds to the air inlet pipe 4 and is used to intercept and guide the dust air entering the cylinder 1 .

[0028] In this embodiment, a sealing gasket 31 is fixed on the top of the cylinder 1 to ensure the sealing performance of the joint between the cylinder 1 and the clean air cylinder 3 .

[0029] In this embodiment, the air outlet of the gas tank 7 is connected to the air inlet of the air pump 8 through an air pipe 33 with a flow regulating valve 32, so as to facilitate the regulation of the flow of compressed air.

[0030] In this embodiment, the mounting plate 12 is adapted to the corresponding fixing plate 19 to ensure that the fixing plate 19 is smoothly abutted into place.

[0031] In this embodiment, the positioning block 20 is matched with the corresponding positioning groove 13 to ensure that the positioning block 20 is smoothly inserted into place.

[0032] In this embodiment, the horizontal portion of the limiting plate 15 is matched with the corresponding first through slot 16 , second through slot 21 and blind slot 17 to ensure that the horizontal portion of the limiting plate 15 is smoothly plugged into place, thereby achieving fixed installation of the cloth bag 18 .

[0033] In this embodiment, a dust collection main pipe 34 and an exhaust fan 35 are also included. Two dust collection branches 36 are connected in parallel to the tail end of the dust collection main pipe 34. Two pumping pipes 37 are connected in parallel at the air inlet of the exhaust fan 35. Gate valves 38 are provided on the two dust collection branches 36 and the two pumping pipes 37. There are two groups of bag dust collectors. The two dust collection branches 36 correspond to the two groups of bag dust collectors one-to-one and are connected to the air inlet pipes 4 of the corresponding bag dust collectors. The two pumping pipes 37 correspond to the two groups of bag dust collectors one-to-one and are connected to the exhaust pipes 29 of the corresponding bag dust collectors. In actual use, the two groups of bag dust collectors can be used in a standby mode, that is, one group of bag dust collectors is in use. The gate valves 38 on the corresponding dust suction branch pipes 36 and the pumping pipes 37 are in the open state, and the other set of bag dust collectors is not working, and the gate valves 38 on the corresponding dust suction branch pipes 36 and the pumping pipes 37 are in the closed state. During the specific dust removal operation, under the suction of the exhaust fan 35, the dust air generated at the feed premixing station can first be sucked by the dust suction main pipe 34 and transported to the dust suction branch pipe 36 with the gate valve 38 opened, and then enter the corresponding bag dust collector through the corresponding dust suction branch pipe 36 and the air intake pipe 4. After the dust is removed and purified, it is sent to the exhaust port of the exhaust fan 35 through the corresponding exhaust pipe 29 and the pumping pipe 37 for discharge, completing the entire purification and dust removal process. When it is necessary to clean or replace the bags of the used bag dust collector, the working status of the two groups of bag dust collectors can be adjusted through the corresponding gate valve 38, so that the spare bag dust collector is put into operation and the used bag dust collector is shut down. This allows for convenient cleaning and bag replacement operations without affecting the overall dust removal operation, making the overall device more convenient and practical.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bag dust collector for feed premixing, comprising a cylinder, an ash hopper fixedly connected to the bottom of the cylinder, and a clean air cylinder provided at the top of the cylinder, characterized in that: The lower part of one side of the cylinder is connected to an air inlet pipe, and the upper parts of the left and right sides are fixedly mounted with a vertically arranged first hydraulic cylinder with an open top. The top of the clean air cylinder is closed, the bottom is open and fixed with a flange, the piston rod of the first hydraulic cylinder is upward and fixedly connected to the flange, an air tank and an air pump are fixed on the outer top of the clean air cylinder, and a hollow air distribution plate is fixed on the inner top, the air inlet of the air pump is connected to the air outlet of the air tank, and the air outlet is connected to the side of the air distribution plate, and the bottom of the air distribution plate is fixedly connected to a partition through a number of support rods. When the flange abuts against the top of the cylinder, The partition extends into the cylinder and abuts against the inner side wall of the cylinder. A plurality of evenly spaced mounting plates are fixed to the bottom of the partition. Positioning grooves are provided on the left and right sides of the bottom of the mounting plate. Electric push rods are embedded on the left and right sides of the mounting plate. The telescopic end of the electric push rod faces the side away from the mounting plate and is fixedly connected with an L-shaped limit plate. The horizontal part of the limit plate faces the mounting plate and the side of the corresponding mounting plate is provided with a first through groove connected to the adjacent positioning groove. A blind groove is provided on the other side groove wall of the positioning groove corresponding to the first through groove. The bottom of the mounting plate A cloth bag is provided, the cloth bag is cylindrical and its bottom is closed, the top is open and is coaxially fixedly connected to a fixing plate, positioning blocks are fixed on the left and right sides of the top of the fixing plate, the fixing plate abuts against the bottom of the corresponding mounting plate, the positioning block corresponds to and is plugged into the positioning slot on the same side, a second through slot is provided at the position corresponding to the first through slot, the horizontal part of the limit plate can pass through the corresponding first through slot and the second through slot and be plugged into the corresponding blind slot, the fixing plate, the mounting plate and the corresponding partition are coaxially provided with a through hole, and the through hole corresponds to the cloth bag. A second hydraulic cylinder is vertically fixed on the bottom of the plate, and the piston rod of the second hydraulic cylinder is downward and fixedly connected to a jet cylinder. The jet cylinder is coaxial with the corresponding through-hole and can extend into the corresponding cloth bag through the corresponding through-hole. The top of the jet cylinder is connected to the bottom of the air distribution plate through a hose. A plurality of jet holes are opened on the side and bottom of the jet cylinder. A plurality of third hydraulic cylinders are horizontally penetrated and distributed at intervals in the upper and lower parts on the side of the jet cylinder. The piston rods of the third hydraulic cylinder face different directions around the jet cylinder and are fixedly connected to a beating ball. One side of the clean air cylinder is connected to an exhaust pipe.

2. The bag dust collector for feed premix according to claim 1, characterized in that: An inverted L-shaped guide plate is fixedly provided on the inner side wall of the cylinder corresponding to the air inlet pipe, and the vertical portion of the guide plate corresponds to the air inlet pipe.

3. The bag dust collector for feed premix according to claim 1, characterized in that: A sealing gasket is fixedly arranged on the top of the cylinder.

4. The bag dust collector for feed premixing according to claim 1, characterized in that: The air outlet of the gas tank is communicated with the air inlet of the air pump through an air delivery pipe with a flow regulating valve.

5. The bag dust collector for feed premixing according to claim 1, characterized in that: The mounting plate is adapted to the corresponding fixing plate.

6. The bag dust collector for feed premixing according to claim 1, characterized in that: The positioning block is matched with the corresponding positioning groove.

7. The bag dust collector for feed premixing according to claim 1, characterized in that: The horizontal portion of the limiting plate is adapted to the corresponding first through slot, second through slot and blind slot.

8. The bag dust collector for feed premixing according to claim 1, characterized in that: It also includes a dust collection main pipe and an exhaust fan, two dust collection branch pipes are connected in parallel at the tail end of the dust collection main pipe, two suction pipes are connected in parallel at the air inlet of the exhaust fan, and gate valves are provided on the two dust collection branch pipes and the two suction pipes. There are two groups of bag dust collectors, the two dust collection branch pipes correspond one-to-one to the two groups of bag dust collectors and are connected to the air inlet pipes of the corresponding bag dust collectors, and the two suction pipes correspond one-to-one to the two groups of bag dust collectors and are connected to the exhaust pipes of the corresponding bag dust collectors.

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