A dust recovery device for a pharmaceutical manufacturing apparatus

Abstract

The application discloses a dust recovery device for pharmaceutical equipment and belongs to the technical field of pharmaceutical production and environmental protection. The pharmaceutical dust recovery device comprises a pre-coagulation part, a filter assembly, a pre-coagulation shell and a filter shell. The pre-coagulation part comprises a collection body arranged in the pre-coagulation shell, the collection body is internally provided with a conveying cavity, an aggregation and combination area is formed at the center of the conveying cavity, the filter assembly comprises a filter cloth bag, and a shaking component is arranged between the filter cloth bag and a support framework. The aggregation and combination area with a smaller central space can make the mutual adsorption and mutual adhesion of the pharmaceutical dust, increase the number of dust with a large particle size before being filtered by the filter cloth bag, improve the blocking and capturing of the filter cloth bag, reduce the amount of dust embedded in the fiber of the filter cloth bag per unit time, and reduce the plugging rate of the filter cloth bag and the pressure loss in the whole dust removal system per unit time.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology in pharmaceutical production, and in particular to a dust recovery device for pharmaceutical equipment. Background Technology

[0002] In pharmaceutical manufacturing, active pharmaceutical ingredients (APIs) are typically finely ground to achieve the specified particle size before use. Currently, the granulation equipment used in pharmaceutical workshops has a sealed structure, resulting in almost no dust emission during operation. However, the feeding and discharging stages cannot be sealed, leading to dust emission. Dust generated during processing is also released during these stages. Dried granules usually pass through a granulator first. Currently, due to inefficient processes, a large amount of dust is emitted indoors. Although dust sources can be sealed during equipment operation, open operation methods are used for feeding, discharging, and equipment cleaning at each stage. Furthermore, drug powder scattered during granulation cannot be recycled for reuse, resulting in significant drug dust leakage, necessitating drug dust recovery.

[0003] Currently, baghouse dust collectors use pulse jet cleaning to clean the filter bags. However, due to airflow diffusion, the cleaning effect varies at different distances from the jet pipe or venturi tube, resulting in uneven cleaning. Furthermore, pharmaceutical powder, transported by the airflow, is directly trapped and captured by the filter bags, leading to more frequent and significant pressure losses in the dust collection system and a shorter maintenance period for the filter's filtration efficiency. Summary of the Invention

[0004] This invention provides a dust recovery device for pharmaceutical equipment, which solves the defects of the prior art, such as different dust removal effects at different positions of the filter bag, uneven dust removal, more frequent large pressure losses in the dust removal system, and short maintenance cycle of the filter bag filtration effect.

[0005] This invention provides a dust recovery device for pharmaceutical equipment, comprising: The pre-coagulation section includes an aggregator with a vortex-shaped conveying channel inside. Drug dust is configured to enter from the outer opening of the conveying channel and converge towards the center, where an aggregation and binding area is formed. The filtration assembly includes filter components disposed on both sides of the pre-coagulation section. Multiple filter bags are disposed on both outer sides of the aggregator. A support frame is disposed inside each filter bag, and a shaking component is disposed between the support frame and the filter bag. The pre-coagulation section is configured such that drug dust converges and binds towards the aggregation and binding area at the center of the conveying channel, increasing its particle size. The filter components are configured such that the shaking component opens the folds on the outer surface of the filter bag to shake off the drug dust adhering to the filter.

[0006] In a further embodiment, the aggregate is provided with a pre-condensed shell on the outside, and the two sides of the aggregate are connected to the pre-condensed shell by multiple elastic connecting rods. A mechanical vibration element is provided on any of the connecting rods, and a cooling element is provided on both sides of the aggregate near the center.

[0007] In a further embodiment, a conveying pipe is provided on both sides of the outside of the aggregate, the conveying pipe is connected to the inside of the aggregate bonding area, and the other end of the conveying pipe connected to the aggregate is connected to a flexible hose, which extends to both sides of the outside of the pre-coagulated shell.

[0008] In a further embodiment, filter housings are provided on both sides of the pre-coagulating shell. The interior of the filter housing is divided into a negative pressure chamber, a filter chamber and a collection chamber from top to bottom. The support frame is fixedly connected to the top of the filter chamber. The interior of the support frame is connected to the negative pressure chamber. The side of the filter housing near the pre-coagulating shell is connected by pipes and hoses with control valves.

[0009] In a further embodiment, a high-pressure nozzle is provided inside the negative pressure chamber, and each branch of the high-pressure nozzle extends into the interior of the support frame. A discharge valve is provided at the bottom of the filter housing, a fan is provided on one side of the filter housing, and a negative pressure pipe connected to the fan is provided at the top of the filter housing.

[0010] In a further embodiment, the shaking component includes a push plug disposed inside the support frame, the round rod at the bottom of the push plug extending to the bottom of the support frame, and the round rod at the bottom of the push plug being connected to the bottom end inside the filter bag, and a return spring is sleeved on the round rod at the bottom of the push plug.

[0011] In a further embodiment, the filter bag includes a first bag body, the outer surface of which has multiple layers of pleated areas along the direction of movement of the pusher, and the pleated areas of the first bag body unfold when the pusher moves downward inside the support frame.

[0012] In a further embodiment, the filter bag includes a second bag body, and a plurality of material guiding grooves are formed on the outer surface of the second bag body. After the second bag body expands, the material guiding grooves on its surface unfold, and the protrusions formed inside the material guiding grooves are provided with elastic ribs.

[0013] In a further embodiment, the smoothness of the inner wall of the aggregate is 0.4 to 0.8. .

[0014] The dust recovery device for pharmaceutical equipment provided by this invention has the following technical effects or advantages: The vortex-shaped conveying channel draws in drug dust, causing it to converge towards a smaller, more concentrated central area. Through mutual adsorption and adhesion between the dust particles, the number of larger particles increases before filtration by the filter bag, enhancing the bag's trapping and capturing capabilities. This reduces the amount of dust embedded in the filter bag fibers per unit time, lowering the clogging rate and pressure loss in the entire dust collection system. Furthermore, the filter bag is impacted by high-pressure gas inside, and the shaking component assists in its expansion, further enhancing the removal of dust adhering to the bag's outer surface. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a perspective view of a dust recovery device for pharmaceutical equipment provided in an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the internal structure of the pre-condensation section of the dust recovery device for pharmaceutical equipment according to an embodiment of the present invention. Figure 1 ; Figure 3 This is a schematic cross-sectional view of the internal structure of the pre-condensation section of the dust recovery device for pharmaceutical equipment according to an embodiment of the present invention. Figure 2 ; Figure 4 This is a schematic cross-sectional view of the internal structure of the filter assembly of the dust recovery device for pharmaceutical equipment according to an embodiment of the present invention; Figure 5 This is an enlarged three-dimensional structural diagram of the pre-condensation section of the dust recovery device for pharmaceutical equipment according to an embodiment of the present invention; Figure 6 This is a three-dimensional enlarged schematic diagram of the internal structure of the filter assembly of the dust recovery device for pharmaceutical equipment according to an embodiment of the present invention. Figure 1 ; Figure 7 This is a three-dimensional enlarged schematic diagram of the internal structure of the filter assembly of the dust recovery device for pharmaceutical equipment according to an embodiment of the present invention. Figure 2 ; Figure 8 This is a three-dimensional enlarged schematic diagram of the internal structure of the filter assembly of the dust recovery device for pharmaceutical equipment according to an embodiment of the present invention. Figure 3 ; Figure 9 This is an enlarged planar structural schematic diagram of a filter bag for a dust recovery device used in pharmaceutical equipment, according to an embodiment of the present invention. Figure 10 This is an enlarged three-dimensional structural diagram of a filter bag for a dust recovery device used in pharmaceutical equipment, according to an embodiment of the present invention.

[0017] Figure label: 1. Pre-coagulation section; 2. Filter assembly; 3. Collector; 4. Conveying channel; 5. Aggregation and bonding area; 6. Filter assembly; 7. Filter bag; 701. First bag body; 702. Second bag body; 8. Support frame; 9. Shaking assembly; 901. Push plug; 902. Return spring; 10. Pre-coagulation shell; 11. Connecting rod; 12. Mechanical vibration component; 13. Refrigeration component; 14. Conveying pipe; 15. Hose; 16. Filter shell; 17. Negative pressure chamber; 18. Filter chamber; 19. Collection chamber; 20. High-pressure spray pipe; 21. Discharge valve; 22. Fan; 23. Negative pressure pipe; 24. Pleated area; 25. Guide chute; 26. Rebound rib. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] As mentioned earlier, existing baghouse dust collectors use pulse jet cleaning to clean the filter bags. Due to airflow diffusion, the cleaning effect varies at different distances from the blowpipe or venturi tube, resulting in uneven cleaning. Furthermore, pharmaceutical powder, transported by the airflow, is directly trapped and captured by the filter bags, leading to more frequent and significant pressure losses in the dust collection system and a shorter maintenance period for the filter's filtration efficiency.

[0020] To address this, the present invention provides a dust recovery device for pharmaceutical equipment, which allows drug powder to first converge in a vortex-shaped conveying channel 4 towards a smaller central aggregation and bonding area 5. Through mutual adsorption and adhesion between drug dust particles, larger particle sizes are formed before being filtered by the filter bag 7, thereby improving the bag's interception and capture capabilities, reducing the amount of dust adhering to the bag per unit filtration time, reducing the clogging rate of the filter bag 7, and reducing pressure loss per unit time during the filtration process.

[0021] The shaking component 9, which is set between the support frame 8 and the externally fitted filter bag 7, opens the filter bag 7 while high-pressure gas is blown into the filter bag 7 to pulse and spray off the dust attached to the outside. The originally contracted folds on the outer surface of the filter bag 7 are expanded in the process of unfolding, which helps the high-pressure gas spray to shake off the drug dust attached to the outer surface of the filter bag 7, thereby increasing the dust removal efficiency and dust removal effect of the filter bag surface.

[0022] The following is combined Figures 1-10 This invention is described in detail.

[0023] First embodiment: like Figures 1-10 As shown, the present invention provides a dust recovery device, particularly a dust recovery device for pharmaceutical equipment. In this embodiment, the dust recovery device mainly includes a pre-coagulation section 1, a filter assembly 2, a filter component 6, a shaking component 9, a pre-coagulation shell 10, and a filter shell 16. Filter shells 16 are provided on both sides of the pre-coagulation shell 10, and the interior of each filter shell 16 is sequentially divided from top to bottom into a negative pressure chamber 17, a filter chamber 18, and a collection chamber 19. The pre-coagulation section 1 includes a collector 3 disposed inside the pre-coagulation shell 10. A vortex-shaped conveying channel 4 is formed inside the collector 3. Drug dust enters the channel from the outer opening of the conveying channel 4 and flows towards the center along the vortex-shaped channel. Openings are formed on both sides of the collector 3. After the drug powder gathers at the center of the conveying channel 4 along the powder conveying direction, the powder begins to aggregate, adsorbing and adhering to each other, forming larger powder particles. At the center of the delivery channel 4, a smaller aggregation and bonding area 5 is formed. Delivery pipes 14 are connected to both sides of the outer side of the aggregate 3. The delivery pipes 14 and the interior of the aggregation and bonding area 5 are interconnected. The drug powder aggregated and bonded inside the aggregation and bonding area 5 is selectively delivered to one of the two delivery pipes 14.

[0024] To prevent drug powder from adhering to the inner wall of aggregate 3, the inner wall of aggregate 3 can be lined with polytetrafluoroethylene (PTFE) to prevent sticking. The inner wall of delivery channel 4 can be made of stainless steel, and its inner wall surface can be polished to 0.4~0.8 mm using processes such as electrolytic polishing. The smoothness of the surface reduces the adhesion of drug powder to the inner wall. Simultaneously, to increase the particle size and better bond between powder particles as the drug powder is conveyed into the delivery cavity 4 by the airflow, cooling components 13 are provided on both sides of the outer surface of the collection body 3. Each cooling component 13 includes semiconductor cooling plates attached to the outer side walls of the collection body 3. The refrigerant in the heat transfer pipes on the surface, in conjunction with the pre-condensed compressor and cooling device located outside the housing 10, cools the interior of the delivery cavity 4. This causes the moisture in the air entering the cavity with the powder to reach near the dew point temperature, forming liquid bridges that bind the powder particles together. This, combined with electrostatic adsorption between the powder and dust particles, increases the amount of large-diameter dust particles in the dust.

[0025] To further reduce the accumulation and adhesion of drug powder to the inner wall of the collection body 3, a mechanical vibration element 12 is provided on the outer side of the collection body 3. The mechanical vibration element 12 includes a vibration motor. Multiple elastic connecting rods 11 are provided on both outer sides of the collection body 3. The mechanical vibration element 12 is installed on any one of the connecting rods 11 to transmit vibration to the collection body 3 and shake off the drug powder adhering to the inner wall of the delivery cavity 4.

[0026] To prevent vibration damage to the pipeline connection between the aggregate 3 and the pre-coagulating shell 10, a flexible hose 15 is connected to the other end of the conveying pipe 14 that connects to the aggregate 3. The ends of the two hoses 15 connected to the conveying pipe 14 extend to the outer sides of the aggregate 3, respectively. On the side of the filter shell 16 near the pre-coagulating shell 10, a pipe with a control valve is installed at the inlet and connected to the flexible hose 15. The control valve on the pipe allows selective feeding of one of the filter components 6 on each side of the pre-coagulating shell 10, achieving a standby function. While one filter component 6 is being operated, the other filter component 6 can continue filtering.

[0027] The filter assembly 6 employs an external filter bag dust collector. Multiple evenly distributed support frames 8 are installed at the top of the filter chamber 18. The interior of each support frame 8 is connected to the negative pressure chamber 17 at the top. A high-pressure nozzle 20 is installed inside the negative pressure chamber 17, with each branch extending into the interior of the support frame 8. High-pressure gas is sprayed through the high-pressure nozzle 20 into the filter bag 7 fitted onto the support frame 8, dislodging the drug powder adhering to the outside of the filter bag 7 in a pulsed manner. A shaking assembly 9 is installed between the support frame 8 and the filter bag 7. Using the high-pressure gas sprayed from the high-pressure nozzle 20, the assembly helps to open up the wrinkles on the outer surface of the filter bag 7, further dislodging the drug powder adhering to the surface of the filter bag 7. The shaken-off drug powder, along with the unfiltered drug powder transported from the collection body 3 to the filter chamber 18, falls into the collection chamber 19 at the bottom of the filter housing 16 to collect and gather the recovered drug powder. A discharge valve 21 is provided at the bottom of the filter housing 16 to control the discharge of the drug powder collected in the collection chamber 19.

[0028] The shaking assembly 9 includes a push plug 901 that can move up and down inside the support frame 8. The bottom of the push plug 901 is a round rod, the bottom end of which extends from a circular hole at the center of the bottom of the support frame 8. The bottom end of the rod is fixedly connected to the bottom of the filter bag 7 via a circular plate, which prevents the bottom of the push plug 901 from damaging the bottom of the filter bag 7. High-pressure gas is introduced into the support frame 8 through the high-pressure nozzle 20, causing the top of the push plug 901 to be directly blown by the high-pressure gas, thus moving the push plug 901 downwards. Figures 6-8 As shown, the side wall of the support frame 8 has multiple vertical openings. The support frame 8 is hollow, which allows the high-pressure airflow ejected from the high-pressure nozzle 20 to be blown from the inside of the support frame 8 to the inside of the filter bag 7, so that the shaking component 9 and the pulse jet cleaning can be carried out simultaneously and assist each other to remove the drug powder attached to the outer surface of the filter bag.

[0029] like Figure 6 As shown, the filter bag 7 includes a first bag body 701. The outer surface of the first bag body 701 is provided with multiple layers of pleated areas 24 along the moving direction of the push plug 901, so that the bag body can form a state that can be stretched and contracted vertically. A return spring 902 is sleeved on the round rod at the bottom of the push plug 901. The return spring 902 is located between the bottom end inside the support frame 8 and the bottom of the air push plate at the top of the push plug 901. It pushes the push plug 901 upward and resets it, assisting the first bag body 701, which has been blown open, to be retracted again, so that the surface can be reformed with multiple layers of pleated areas 24. The pleated areas 24 increase the filtration area of ​​the outer surface of the first bag body 701.

[0030] Second embodiment: The filter bag 7 also includes a second bag body 702 disposed on the support frame 8, such as Figures 7-9 As shown, the outer surface of the second bag 702 has multiple surrounding guide grooves 25. The cross-section of the guide grooves 25 is V-shaped. No push plug 901 or return spring 902 is provided between the second bag 702 and the support frame 8. After high-pressure gas is introduced into the second bag 702 through the high-pressure nozzle 20, the second bag 702 expands laterally. After the drug powder remaining inside the guide grooves 25 is absorbed, the depth of the guide grooves 25 becomes shallower as the second bag 702 expands. As the bag expands, the powder filtered from the outer surface of the bag is ejected and collects inside the collection chamber 19. Figure 10 As shown, inside the second bag body 702, rebound ribs 26 are provided at the positions where the material guide groove 25 forms a protrusion. After the second bag body 702 is blown up and expanded, multiple material guide grooves 25 are formed on the surface again under the elastic traction of the rebound ribs 26.

[0031] The filter bag 7 can be made of materials such as polyester needle-punched felt, PTFE (polytetrafluoroethylene) coated needle-punched felt, PPS (polyphenylene sulfide) needle-punched felt, polyester 208 fleece, polyester antistatic needle-punched felt, and woven 729 polyester filter media. A negative pressure pipe 23 is installed at the top of the filter housing 16. The negative pressure pipe 23 is connected to a fan 22 located on the outside of the filter housing 16. The fan 22 generates negative pressure inside the negative pressure chamber 17, allowing dust containing drug powder to be transported through the conveying channel 4 inside the collector 3 to the interior of the filter chamber 18. The fan's flow rate range is 402~545. Total pressure is 2200~2261 Between, such as Figure 1 As shown, a gas collection hood is installed at the inlet of the collection body 3. The gas collection hood is positioned at locations prone to drug powder leakage, such as feeding, discharging, and filling in the pharmaceutical process, to recover, absorb, and filter out the drug powder. Dust concentration sampling ports can be installed on the pipeline connecting the collection hopper and the collection body 3, as well as on the negative pressure pipe 23, to facilitate monitoring of dust concentration before and after filtration, and to detect pressure loss before and after filtration, thus facilitating the determination of bag clogging.

[0032] The surface area of ​​the filter bag is calculated based on a cylindrical shape: S represents the filtration surface area of ​​the filter bag, in units of... ; d It is the cross-sectional diameter of the filter bag, in units of... m , L It is the length of the filter bag, in units of 1. m .

[0033] The state of air is calculated as follows: ;in, It is air density, the unit is... ; P It is atmospheric pressure, the unit is... Pa ; T It is air temperature, the unit is... K ; R It is the gas constant of air, which is 287. J / (kg / K) .

[0034] According to the formula: ; Adjust the filtration speed, where It is the filtration speed, and the unit is filtration velocity. m / min ; Q It is the gas flow rate, and the unit is... m / min ; F This is the effective filtration area of ​​the filter bag (default is the above). S ), the unit is .

[0035] In summary, the dust recovery device for pharmaceutical equipment described in this invention has the following advantages: First, the drug powder first gathers in the vortex-shaped conveying cavity 4 towards the smaller central aggregation and bonding area 5. Through mutual adsorption and adhesion between the drug dust particles, larger particle sizes are formed before being filtered by the filter bag 7, which improves the bag's interception and capture, reduces the amount of dust adhering to the bag per unit filtration time, reduces the clogging rate of the filter bag 7, and reduces the pressure loss per unit time during the filtration process.

[0036] 2. The shaking component 9 installed between the support frame 8 and the externally fitted filter bag 7 opens the filter bag 7 while high-pressure gas is blown into the filter bag 7 to pulse and spray off the dust attached to the outside. The originally contracted folds on the outer surface of the filter bag 7 are expanded in the process of unfolding, which helps the high-pressure gas spray to shake off the drug dust attached to the outer surface of the filter bag 7, thereby increasing the dust removal efficiency and dust removal effect of the filter bag surface.

[0037] In the description of this invention, it should be noted that the terms "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dust recovery device for pharmaceutical equipment, characterized in that, include: The pre-coagulation section (1) includes a collection body (3), which has a vortex-shaped conveying channel (4) inside. The drug dust is configured to enter from the outer opening of the conveying channel (4) and gather towards the center. An aggregation and binding area (5) is formed at the center of the conveying channel (4). The filter assembly (2) includes filter components (6) disposed on both sides of the pre-coagulation section (1). Multiple filter bags (7) are disposed on both sides of the outer side of the aggregate (3). A support frame (8) is disposed inside the filter bag (7). A shaking component (9) is disposed between the support frame (8) and the filter bag (7). Among them, the pre-coagulation section (1) is configured to allow drug dust to gather and combine in the central aggregation and bonding area (5) after passing through the inside of the conveying cavity (4) and increase the particle size. The filter component (6) is configured to shake off the drug dust attached after filtration by opening the folds on the outer surface of the filter bag (7) using the shaking component (9). The shaking component (9) includes a push plug (901) disposed inside the support frame (8). The round rod at the bottom of the push plug (901) extends to the bottom of the support frame (8), and the round rod at the bottom of the push plug (901) is connected to the bottom end inside the filter bag (7). A reset spring (902) is sleeved on the round rod at the bottom of the push plug (901).

2. The dust recovery device for pharmaceutical equipment according to claim 1, characterized in that, The outside of the collection body (3) is provided with a pre-condensed shell (10). The two sides of the outside of the collection body (3) are connected to the pre-condensed shell (10) by multiple elastic connecting rods (11). A mechanical vibration element (12) is provided on any of the connecting rods (11). A cooling element (13) is provided on both sides of the outside of the collection body (3) near the center.

3. The dust recovery device for pharmaceutical equipment according to claim 2, characterized in that, Both sides of the outer side of the aggregate (3) are provided with conveying pipes (14), which are connected to the inner side of the aggregate bonding area (5). The other end of the conveying pipe (14) connected to the aggregate (3) is connected with a hose (15), which extends to both sides of the outer side of the pre-condensed shell (10).

4. The dust recovery device for pharmaceutical equipment according to claim 3, characterized in that, The pre-coagulating shell (10) is provided with filter shells (16) on both sides of the exterior. The interior of the filter shell (16) is divided into a negative pressure chamber (17), a filter chamber (18) and a collection chamber (19) from top to bottom. The support frame (8) is fixedly connected to the top of the filter chamber (18). The interior of the support frame (8) and the negative pressure chamber (17) are connected. The side of the filter shell (16) near the pre-coagulating shell (10) is connected by pipes and hoses (15) with control valves.

5. The dust recovery device for pharmaceutical equipment according to claim 4, characterized in that, The negative pressure chamber (17) is equipped with a high-pressure nozzle (20), and each branch of the high-pressure nozzle (20) extends into the interior of the support frame (8). The bottom of the filter housing (16) is equipped with a discharge valve (21), and a fan (22) is provided on one side of the outside of the filter housing (16). The top of the filter housing (16) is equipped with a negative pressure pipe (23) connected to the fan (22).

6. The dust recovery device for pharmaceutical equipment according to claim 1, characterized in that, The filter bag (7) includes a first bag body (701), and the outer surface of the first bag body (701) has a multi-layered pleated area (24) formed along the moving direction of the pusher (901). When the pusher (901) moves downward inside the support frame (8), the pleated area (24) of the first bag body (701) unfolds.

7. The dust recovery device for pharmaceutical equipment according to claim 1, characterized in that, The filter bag (7) includes a second bag body (702). The outer surface of the second bag body (702) has a plurality of material guide grooves (25). After the second bag body (702) expands, the material guide grooves (25) on its surface unfold, and the protrusions formed inside the second bag body (702) of the material guide grooves (25) are provided with spring ribs (26).

8. The dust recovery device for pharmaceutical equipment according to claim 1, characterized in that, The smoothness of the inner wall of the aggregate (3) is 0.4~0.8μm.

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