A PVC main machine dust filtering self-absorption collecting device

Abstract

The utility model belongs to dust filter technical field, concretely relates to a kind of for PVC main machine dust filter self-absorption collection device;Including: double collector assembly, the double collector assembly includes two material barrels, material barrel lower end is provided with discharge gate, material barrel upper and lower sides are respectively provided with air outlet and feed inlet, two feed inlets are respectively connected in same one PVC main machine and alternately use;Filtering component, the filtering component is set in the air outlet, for filtering dust;Discharge component, the discharge component is set in the material barrel lower end, for plugging the discharge gate;Conversion component, the discharge component can contact the conversion component, the conversion component is set in the air outlet and the feed inlet, for controlling the air outlet and the feed inlet opening and closing;Avoid powder to enter the cavity of vacuum pump and combine with water to form accumulation block, cause the blockage of vacuum pump, so that vacuum pump will not appear blockage, jam, even vacuum pump motor burnout.

Description

Technical Field

[0001] This utility model belongs to the field of dust filtration technology, specifically relating to a self-absorption collection device for dust filtration in PVC main units. Background Technology

[0002] With the continuous advancement of PVC production technology, the requirements for product quality are becoming increasingly stringent. Early PVC production processes may not have been precise enough in terms of volatile matter removal and plasticization quality control, making it difficult to meet the quality requirements of high-end applications. Therefore, [the following text is incomplete and requires further context: "has become one of the key means to improve product quality."]

[0003] To meet the demands of PVC pipe production and adapt to technological advancements, vacuum technology needs to be introduced into the main unit to remove volatiles. During the synthesis and processing of PVC resin, some volatiles remain, such as unreacted monomers, solvents, and water. A vacuum system in the main unit reduces system pressure, allowing these volatiles to vaporize and be extracted rapidly at lower temperatures, thereby improving the purity and quality of PVC products and reducing defects such as odors and bubbles. Simultaneously, the vacuum environment facilitates better plasticization of the material in the main unit. Under vacuum, air is extracted from the material, resulting in closer contact between materials and a more uniform plasticization process, effectively improving the plasticization quality of PVC and giving the product better physical and processing properties. By removing volatiles through vacuum and improving plasticization quality, production failures and product defects caused by volatile residues and poor plasticization can be reduced, thereby increasing production efficiency and lowering production costs.

[0004] With continuous adjustments and optimizations to the process formula and technology, there are often incompletely plasticized PVC powder raw materials at the vacuum adsorption position. These raw materials will enter the vacuum pump along with the volatiles. The volatile gases are discharged by the vacuum pump, but the powder raw materials will combine with water in the cavity of the water ring vacuum pump to form accumulation blocks, causing blockage of the vacuum pump, which can lead to blockage and jamming of the vacuum pump or even burnout of the vacuum pump motor. Summary of the Invention

[0005] Based on this, this application provides a self-absorption collection device for dust filtration in PVC main units, in order to solve the technical problem in the prior art that powder raw materials will combine with water in the cavity of a water ring vacuum pump to form accumulation blocks, causing blockage of the vacuum pump, or even jamming or burnout of the motor.

[0006] The technical solution to the above-mentioned technical problems in this application is as follows:

[0007] A self-absorption collection device for dust filtration in PVC main units, comprising:

[0008] The dual collector assembly includes two material barrels. The lower end of the material barrel is provided with a discharge port, and the upper and lower sides of the material barrel are respectively provided with an air outlet and a material inlet. The two material inlets are respectively connected to the same PVC host and are used alternately.

[0009] A filter assembly is disposed at the air outlet and is used to filter dust.

[0010] A discharge assembly is disposed at the lower end of the material barrel and is used to block the discharge port;

[0011] A conversion component, wherein the discharge component is in contact with the conversion component, the conversion component is disposed at the air outlet and the feed inlet, and is used to control the opening and closing of the air outlet and the feed inlet;

[0012] A collection component is disposed below the material hopper and is used to receive dust flowing out of the material hopper.

[0013] Preferably, the inner wall of the material barrel is provided with an inclined plate that is inclined in the vertical direction in the middle, and a space is reserved between the lowest end of the inclined plate and the inner wall of the material barrel for dust to pass through. The air outlet and the feed inlet are located on the upper and lower sides of the inclined plate, respectively.

[0014] Preferably, the upper end of the material bucket is open and is fitted with a bucket lid.

[0015] Preferably, the filter assembly includes an exhaust pipe connected to the air outlet and a rotating part rotating inside the exhaust pipe, wherein a filter cylinder connected to the inside of the exhaust pipe is sleeved on the rotating part and the filter cylinder is located inside the material barrel.

[0016] Preferably, the rotating part includes a collar and a bearing disposed on the collar. The bearing is disposed on the inner wall of the exhaust pipe. A shaft located inside the exhaust pipe is disposed in the middle of the collar. Several spiral blades are formed on the shaft. The filter cartridge is sleeved on the end of the collar.

[0017] Preferably, a toothed ring is provided on the outer wall of the collar, and an elastic plate that can undergo elastic deformation and contact the teeth on the toothed ring is provided on the inclined plate.

[0018] Preferably, the discharge assembly includes a telescopic rod fixed to the material barrel, and a plug plate for blocking the discharge port is connected to the movable end of the telescopic rod.

[0019] Preferably, the collection assembly includes a support for mounting the material hopper and a slide rail located at the lower end of the support rail, wherein a dust box is provided in the slide rail and a material hole is provided in the dust box.

[0020] Preferably, the dust box has an opening on one side, and a groove is provided on the side wall corresponding to the opening, with the groove sliding in contact with a baffle for sealing the opening.

[0021] Preferably, the conversion component includes a switch and electric valves connected to the air outlet and the feed inlet. The two electric valves are electrically connected to the switch. When the baffle is in the closed state, pressing the switch will open the two electric valves.

[0022] Compared with the prior art, this application has at least the following advantages:

[0023] This application provides a self-absorption dust collection device for PVC main unit dust filtration. The air outlet is connected to a vacuum pump, and the PVC main unit is connected to the inlet via a pipeline. The conversion assembly connecting the air outlet and inlet on the material tank is opened, while the discharge assembly at the lower end of the material tank remains in a blocked state. Then, the vacuum pump is turned on, drawing air out of the material tank and reducing the internal air pressure. This creates a negative pressure between the inside of the material tank and the inside of the PVC main unit connected via the pipeline, drawing in air mixed with dust. This allows the filter assembly to trap the dust. Clean air is drawn out by the vacuum pump, and the filtered dust collects inside the material bucket. Once the dust in the material bucket reaches the area that needs cleaning, the conversion component connecting the air outlet and the inlet on the material bucket is closed, and the discharge component connected to the material bucket is opened, allowing the filtered dust in the material bucket to be discharged into the collection component below the material bucket. This completes the dust discharge from the material bucket and can treat the dust in the PVC main unit, preventing powder from entering the vacuum pump cavity and combining with water to form accumulations that could clog the vacuum pump. This prevents the vacuum pump from becoming clogged, jammed, or even burning out the vacuum pump motor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the self-absorption collection device for dust filtration of PVC main unit used in this application;

[0025] Figure 2 This is a schematic diagram of the internal structure of the dust filtration self-absorption collection device for PVC main unit used in this application;

[0026] Figure 3 This is a schematic diagram of the switch structure of this application;

[0027] Figure 4 This is a schematic diagram of the filter cartridge structure of this application;

[0028] Figure 5 This is a schematic diagram of the exhaust duct structure of this application;

[0029] Figure 6 This is a schematic diagram of the structure of the collar in this application;

[0030] Figure 7 This is a schematic diagram of the structure of the helical blade in this application;

[0031] Figure 8This is a schematic diagram of the structure of the bucket lid in this application;

[0032] Figure 9 This is a schematic diagram of the structure of the stent in this application;

[0033] Figure 10 This is a schematic diagram of the structure of the baffle in this application;

[0034] Figure 11 This is a schematic diagram of the dust box structure of this application.

[0035] In the diagram: 101 material bucket; 102 discharge port; 103 inclined plate; 104 bucket lid; 105 feed inlet; 106 telescopic rod; 107 insert plate; 108 elastic plate; 201 exhaust pipe; 202 toothed ring; 203 filter cartridge; 204 shaft; 205 collar; 206 spiral blade; 207 bearing; 301 switch; 302 electric valve; 401 bracket; 402 slide rail; 403 dust box; 404 material hole; 405 open opening; 406 chute; 407 baffle. Detailed Implementation

[0036] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0037] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "end," "top," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] Please refer to Figures 1 to 11 In one specific embodiment of this application,

[0040] A self-absorption collection device for dust filtration in PVC main units, comprising:

[0041] The dual collector assembly includes two material barrels 101. The lower end of the material barrel 101 is provided with a discharge port 102. The upper and lower sides of the material barrel 101 are respectively provided with an air outlet and a material inlet 105. The two material inlets 105 are respectively connected to the same PVC host and are used alternately.

[0042] A filter assembly is disposed at the air outlet and is used to filter dust.

[0043] A discharge assembly is disposed at the lower end of the material barrel and is used to block the discharge port 102;

[0044] A conversion component, wherein the discharge component is in contact with the conversion component, the conversion component is disposed at the air outlet and the feed inlet 105, and is used to control the opening and closing of the air outlet and the feed inlet 105;

[0045] A collection component is provided below the material hopper 101 to receive dust flowing out of the material hopper 101.

[0046] In the above scheme, the filter component can be a filter element, a filter plate, or other dust filtration device;

[0047] The discharge assembly can be a plug or a device that can block the discharge port 102;

[0048] The conversion component can be a valve or a device that controls the opening and closing of the air outlet and the feed inlet 105;

[0049] The collection component can be a plastic bucket or a metal hopper.

[0050] In use, connect the two air outlets on the two material tanks 101 to the vacuum pump, and connect the PVC main unit to the two inlets 105 through two pipes. Then, close the conversion assembly connecting the air outlet and inlet 105 on the first material tank 101, and simultaneously open the conversion assembly connecting the air outlet and inlet 105 on the second material tank 101. Keep the discharge assembly on the lower discharge port 102 of each material tank 101 in the blocked state. Then, turn on the vacuum pump to allow the vacuum pump to pump the second material tank 101... Air is drawn out of the first container (01), reducing the air pressure inside the second container (101). This creates a negative pressure between the second container (101) and the PVC main unit connected via a pipe. This causes the dust-laden air from the PVC main unit to flow into the second container (101), drawing it in. The dust from the PVC main unit is then filtered by the filter assembly, which traps the dust. Clean air is then drawn out by the vacuum pump. Dust will accumulate inside the second material bin 101. Once the dust accumulation in the second material bin 101 reaches the required level, the conversion assembly connecting the air outlet and inlet 105 on the second material bin 101 will close, while the conversion assembly connecting the air outlet and inlet 105 on the first material bin 101 will open, allowing dust from the PVC generator to flow into the first material bin 101. At this time, the dust from the PVC generator will enter the first material bin 101 and be filtered by the filter assembly there. Meanwhile, the dust in the second material bin 101... No new air mixed with dust will enter into 01. The discharge component connected to the second material tank 101 will be turned on, allowing the dust filtered out in the second material tank 101 to be discharged into the collection component below the second material tank 101, thus completing the discharge of dust from the second material tank 101. Meanwhile, the first material tank 101 will "take over" and continue to process the dust in the PVC host. Similarly, after the dust in the first material tank 101 accumulates to the extent that it needs to be cleaned, the process will switch again, causing the first material tank 101 to stop filtering and the second material tank 101 to start filtering.

[0051] The above method can treat the dust in the PVC main unit, preventing the powder from entering the vacuum pump cavity and combining with water to form a clump, causing blockage of the vacuum pump. This prevents the vacuum pump from becoming clogged, stuck, or even burning out the vacuum pump motor. Moreover, the two material tanks 101 can be switched in a relay manner to maintain a continuous filtration process, eliminating the need to stop the PVC main unit to clean the material tanks 101.

[0052] In addition, the conversion components, taking valves as an example, can be electrically controlled valves, which do not require manual switching of opening and closing by on-site personnel. Instead, they can be controlled by programs or switches, improving the level of automation and intelligence. Moreover, they can control the two conversion components connected to the two material tanks 101, so that the two conversion components can open and close synchronously to switch between open and closed states. That is, when one is open, the other is closed, thus smoothly completing the switching of the working state of the two material tanks 101.

[0053] When the filtered dust accumulates in the material hopper 101, it tends to concentrate from the bottom and gradually rise. Since the feed inlet 105 is located at the bottom of the hopper 101, dust can clog the feed inlet 105. Therefore, to avoid this problem,

[0054] The material barrel 101 described in this application has an inclined plate 103 that is inclined in the vertical direction in the middle of the inner wall, and a space is reserved between the lowest end of the inclined plate 103 and the inner wall of the material barrel 101 for dust to pass through. The air outlet and the inlet 105 are located on the upper and lower sides of the inclined plate 103, respectively.

[0055] When filtering dust, the dust enters through the inlet 105 and, due to the air in the material container 101 flowing upwards through the outlet under the action of the vacuum pump, the dust, after being blocked by the inclined plate 103, flows through the space reserved between the lowest end of the inclined plate 103 and the inner wall of the material container 101 and flows towards the filter assembly. The dust blocked by the filter assembly falls onto the inclined plate 103, thus flowing along the inclined direction of the inclined plate 103 towards the lowest end of the inclined plate 103, and falling from the lowest end of the inclined plate 103 to one side of the bottom of the material container 101. Figure 2 As can be seen, the side where dust accumulates is the side away from the feed inlet 105, so that the dust accumulates in a place away from the feed inlet 105, avoiding the dust from accumulating directly at the feed inlet 105 and causing the feed inlet 105 to become blocked.

[0056] Furthermore, the material hopper 101 described in this application is open at the top and has a lid 104 fastened to it. The lid 104 can be pulled up by the operator to open the top of the material hopper 101, making it convenient for the operator to inspect and maintain the inside of the material hopper 101. Moreover, the material hopper 101 and the lid 104 can be made of transparent material, allowing the inside of the material hopper 101 and its operating status during dust filtration to be observed directly from the outside. It also allows the operator to understand the amount of dust accumulation and determine whether timely cleaning is necessary.

[0057] Specifically, an embodiment of the above-mentioned filtering component is provided:

[0058] The filter assembly includes an exhaust pipe 201 connected to the air outlet and a rotating part that rotates inside the exhaust pipe 201. A filter cartridge 203 that communicates with the inside of the exhaust pipe 201 is sleeved on the rotating part and is located inside the material barrel 101.

[0059] Fix the exhaust pipe 201 to the air outlet and position the inner end of the exhaust pipe 201 inside the material barrel 101. Then connect the outer end of the exhaust pipe 201 to the vacuum pump through a pipe. Finally, put the filter cartridge 203 on the rotating part. When in use, the vacuum pump will draw the air out of the material barrel 101, and the dust will be blocked by the filter cartridge 203, thus achieving the dust filtration effect.

[0060] Specifically, an embodiment of the aforementioned rotating part is provided:

[0061] The rotating part includes a collar 205 and a bearing 207 disposed on the collar 205. The bearing 207 is disposed on the inner wall of the exhaust pipe 201. A shaft 204 located inside the exhaust pipe 201 is disposed in the middle of the collar 205. Several spiral blades 206 are formed on the shaft 204. The filter cartridge 203 is sleeved on the end of the collar 205.

[0062] After the vacuum pump is started, it will draw the air out of the material tank 101. During this process, the air needs to flow out from the exhaust pipe 201. The fluid formed by the air will act on several spiral blades 206 in the exhaust pipe 201. The curved surface of the spiral blades 206 will cause the fluid to push the spiral blades 206, causing the spiral blades 206 to drive the shaft 204 to rotate along the axis of the shaft 204. Under the drive of the shaft 204, the collar 205 will rotate using the bearing 207, thereby causing the filter cartridge 203 sleeved at the end of the collar 205 to rotate together, so that the filter cartridge 203 rotates at a uniform speed.

[0063] By employing the above method, it is possible to avoid the situation where, when the filter cartridge 203 is stationary and the air mixed with dust flows upward, most of the dust comes into contact with the lower outer wall of the filter cartridge 203, causing localized blockage on the lower side of the filter cartridge 203. This avoids the situation where the filter cartridge 203 becomes locally blocked and its filtration capacity decreases. By rotating the filter cartridge 203 at a uniform speed, the surface of the filter cartridge 203 rotates evenly to the lower side to filter the dust, ensuring that the dust adhering to the outer wall of the filter cartridge 203 is evenly distributed and preventing localized blockage.

[0064] Furthermore, because the dust filtered by the filter cartridge 203 will adhere to the outer surface of the filter cartridge 203 during the filtration process, causing the filter cartridge 203 to become clogged, and long-term adhesion will also corrode the filter cartridge 203, leading to a reduction in the service life of the filter cartridge 203. Therefore, in order to extend the service life of the filter cartridge 203, the dust adhering to the outer surface of the filter cartridge 203 should be cleaned in a timely manner during use. In this application, a toothed ring 202 is provided on the outer wall of the collar 205, and an elastic plate 108 that can undergo elastic deformation and contact the teeth on the toothed ring 202 is provided on the inclined plate 103.

[0065] As the filter cartridge 203 rotates with the collar 205, the toothed ring 202 on the outer wall of the collar 205 rotates together. During the rotation, the teeth on the toothed ring 202 will strike the elastic plate 108 in sequence. The elastic plate 108 can undergo elastic deformation and bends after being struck by the teeth to avoid blocking the rotation of the toothed ring 202. The impact between the teeth and the elastic plate 108 will generate vibration, which will be transmitted to the toothed ring 202, and then to the collar 205 and the filter cartridge 203. This will cause the filter cartridge 203 to vibrate, shaking off the dust adhering to the surface of the filter cartridge 203, reducing the amount of dust adhering to the filter cartridge 203, preventing the filter cartridge 203 from being blocked by dust, and extending the service life of the filter cartridge 203.

[0066] At the same time, the vibration can be transmitted to the inclined plate 103 by the elastic plate 108, so that the dust on the inclined plate 103 can slide down the inclined plate 103 faster, and the dust accumulated on the inclined plate 103 can fall to the bottom of the material bucket 101 in time.

[0067] Specifically, an embodiment of the above-mentioned discharge component is provided:

[0068] The discharge assembly includes a telescopic rod 106 fixed to the material barrel 101, and a plug plate 107 for blocking the discharge port 102 is connected to the movable end of the telescopic rod 106.

[0069] The telescopic rod 106 can be a pneumatic cylinder, an electric telescopic rod, or a hydraulic cylinder. When the telescopic rod 106 is in the retracted state, the movable end of the telescopic rod 106 drives the insert plate 107 away from the discharge port 102 and does not block the discharge port 102. When the movable end of the telescopic rod 106 drives the insert plate 107 to block the discharge port 102, the telescopic rod 106 is in the extended state.

[0070] The above process allows for dust filtration. When the material tank 101 is in operation, the telescopic rod 106 is extended, causing the insert plate 107 to block the discharge port 102. This prevents external air from entering the material tank 101 through the discharge port 102, thus preventing the dust in the PVC main unit from being sucked out. When the material tank 101 stops working, after the conversion component is closed, the telescopic rod 106 can drive the insert plate 107 away from the discharge port 102, allowing the discharge port 102 to open and the dust accumulated at the bottom of the material tank 101 to flow out through the discharge port 102, completing the dust cleaning process.

[0071] Specifically, an embodiment of the aforementioned collection component is provided:

[0072] The collection assembly includes a support 401 for mounting the material hopper 101 and a slide 402 located at the lower end of the support 401. A dust box 403 is provided in the slide 402, and a material hole 404 is provided on the dust box 403.

[0073] When in use, the dust box 403 is slid into the lower end of the material bucket 101 along the slide 402, and the material hole 404 is aligned with the discharge port 102 at the lower end of the material bucket 101. When the insert plate 107 leaves the discharge port 102, the dust flowing out of the discharge port 102 can directly pass through the material hole 404 and enter the dust box 403, thereby completing the collection of dust. Furthermore, the box-shaped form of the dust box 403 reduces the range of communication between the dust box 403 and the outside world, thereby reducing the range of dust pollution in the air when the dust falls.

[0074] Furthermore, after the dust enters the dust box 403, when it is transferred out of the dust box 403, it is inconvenient to pour out the dust inside because the dust box 403 only has a material hole 404. Therefore, in this application, the dust box 403 has an opening 405 on one side, and a sliding groove 406 is provided on the side wall corresponding to the opening 405. The sliding groove 406 slides in contact with a baffle 407 for sealing the opening 405.

[0075] When dust is collected in the dust box 403, the baffle 407 slides vertically along the chute 406 to block the opening 405, allowing the dust to collect in the dust box 403 after passing through the feed hole 404. When the dust collected in the dust box 403 needs to be emptied to a unified processing location, the baffle 407 can be pulled up, opening the opening 405. This allows the dust box 403 to be tilted to one side of the opening 405, causing the dust inside the dust box 403 to be poured out, thus completing the quick emptying of the dust and facilitating cleaning of the dust box 403.

[0076] Specifically, an embodiment of the above-mentioned conversion component is provided:

[0077] The conversion component includes a switch 301 and electric valves 302 connected to the air outlet and the feed inlet 105. The two electric valves 302 are electrically connected to the switch 301. When the baffle 407 is in the closed state, pressing the switch 301 will open the two electric valves 302.

[0078] Switch 301 is installed on the outside of the discharge port 102 at the lower end of the material tank 101. Electric valve 302 is connected to the air outlet and the inlet 105. When switch 301 is closed, electric valve 302 opens; when switch 301 is open, electric valve 302 closes. When the movable end of telescopic rod 106 drives the insert plate 107 to block the discharge port 102, the insert plate 107 moves and presses against switch 301. At this time, switch 301 is activated, energizing and opening electric valve 302, and keeping electric valve 302 open, thereby allowing the PVC main... Dust in the machine enters the feed inlet 105 through the pipe, and the vacuum pump is also connected to the air outlet through the pipe to suck out the air from the material bucket 101. When the dust in the material bucket 101 accumulates to a certain amount, the switch 301 is released when the extension rod 106 moves the insert plate 107 away from the discharge port 102. At this time, the switch 301 is disconnected, the electric valve 302 is closed, so that the air inside the material bucket 101 stops flowing, and the material bucket 101 is in a stopped working state, so that the dust in the material bucket 101 can be cleaned out.

[0079] Meanwhile, when the insert plate 107 at the lower end of the first material bucket 101 presses against the switch 301, the switch 301 closes and transmits a signal to the control center (such as a computer or control system). When the insert plate 107 moves to release the switch 301, the electric valve 302 on the first material bucket 101 will close. At this time, the signal of the switch 301 opening will be transmitted to the control center. The control center can then control the telescopic rod 106 at the lower end of the second material bucket 101 to start via an electrical signal. That is, the telescopic rod 106 on the second material bucket 101 drives the insert plate 107 to block the discharge port 102 at the lower end of the second material bucket 101. During this process, the insert plate 107 at the lower end of the second material bucket 101 will press down the corresponding switch 301, thereby opening the electric valve 302 on the second material bucket 101, causing the second material bucket 101 to start working and completing the switching between the two material buckets 101.

[0080] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A self-absorption and collection device for dust filtration in PVC main units, characterized in that, include: The dual collector assembly includes two material barrels. The lower end of the material barrel is provided with a discharge port, and the upper and lower sides of the material barrel are respectively provided with an air outlet and a material inlet. The two material inlets are respectively connected to the same PVC host and used alternately. A filter assembly is disposed at the air outlet and is used to filter dust. A discharge assembly is disposed at the lower end of the material barrel and is used to block the discharge port; A conversion component, wherein the discharge component is in contact with the conversion component, the conversion component is disposed at the air outlet and the feed inlet, and is used to control the opening and closing of the air outlet and the feed inlet; A collection component is disposed below the material hopper and is used to receive dust flowing out of the material hopper.

2. The self-absorption and collection device for dust filtration in PVC main units as described in claim 1, characterized in that, An inclined plate that tilts vertically is provided in the middle of the inner wall of the material barrel, and a space is reserved between the lowest end of the inclined plate and the inner wall of the material barrel for dust to pass through. The air outlet and the feed inlet are located on the upper and lower sides of the inclined plate, respectively.

3. The self-absorption collection device for dust filtration in PVC main units as described in claim 1, characterized in that, The top of the material bucket is open and is fitted with a lid.

4. The self-absorption and collection device for dust filtration in PVC main units as described in claim 2, characterized in that, The filter assembly includes an exhaust pipe connected to the air outlet and a rotating part that rotates inside the exhaust pipe. A filter cartridge, which is connected to the inside of the exhaust pipe, is fitted onto the rotating part and is located inside the material barrel.

5. The self-absorption and collection device for dust filtration in PVC main units as described in claim 4, characterized in that, The rotating part includes a collar and a bearing disposed on the collar. The bearing is disposed on the inner wall of the exhaust pipe. A shaft located inside the exhaust pipe is disposed in the middle of the collar. Several spiral blades are formed on the shaft. The filter cartridge is sleeved on the end of the collar.

6. The self-absorption collection device for dust filtration in PVC main units as described in claim 5, characterized in that, The outer wall of the collar is provided with a toothed ring, and the inclined plate is provided with an elastic plate that can undergo elastic deformation and contact the teeth on the toothed ring.

7. The self-absorption and collection device for dust filtration in PVC main units as described in claim 1, characterized in that, The discharge assembly includes a telescopic rod fixed to the material barrel, and a plug plate for blocking the discharge port is connected to the movable end of the telescopic rod.

8. The self-absorption collection device for dust filtration in PVC main units as described in claim 1, characterized in that, The collection assembly includes a support for mounting the material hopper and a slide rail located at the lower end of the support rail. A dust box is installed in the slide rail, and the dust box has a material hole.

9. The self-absorption collection device for dust filtration in PVC main units as described in claim 8, characterized in that, The dust box has an opening on one side, and a groove is provided on the side wall corresponding to the opening. The groove slides in contact with a baffle for sealing the opening.

10. The self-absorption collection device for dust filtration in PVC main units as described in claim 9, characterized in that, The conversion assembly includes a switch and electric valves connected to the air outlet and the feed inlet. The two electric valves are electrically connected to the switch. When the baffle is in the closed state, pressing the switch will open the two electric valves.

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