Adaptive backflushing cleaning of a powder stabilizer recovery filtration system and control method

Abstract

The application discloses a self-adaptive back-blowing cleaning powder stabilizer recovery filtering system and a control method, which comprises a rack, a cyclone separator arranged at the center of the inside of the rack, a filtering box arranged at the center of the upper end surface of the cyclone separator, an air guide fan arranged at the center of the upper end surface of the filtering box, a filtering structure arranged at the center of the inside of the filtering box, and an air flow back-blowing structure arranged at the center of the upper end surface of the filtering structure. The application realizes global self-adaptive high-pressure back-blowing through the hard stripping of the filter screen board dust by the scraper, realizes complete dredging of the filter screen micropore through the gear linkage multi-stage air pipe, eliminates the cleaning blind area, and realizes one-side online cleaning and one-side continuous filtering through the cooperation of the double-layer partition rotation operation mode and the differential pressure self-adaptive closed-loop control. The cleaning program can be intelligently started and stopped according to the filter screen blockage state, the powder recovery cleanliness, the equipment operation stability and the automatic continuous production capacity are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of powdered material filtration and recovery technology, specifically to an adaptive backflushing cleaning powdered stabilizer recovery filtration system and control method. Background Technology

[0002] Calcium-zinc composite stabilizer is synthesized from calcium salts, zinc salts, lubricants, antioxidants and other components using a special composite process. It is a non-toxic and environmentally friendly PVC heat stabilizer. During its production and processing, a large amount of powdery material will be dispersed into the air and needs to be recycled and filtered.

[0003] Existing technologies employing fan suction and filter filtration for recycling devices generally suffer from the following technical challenges: filter clogging easily leads to a sharp drop in recycling efficiency; fine-sized and highly adhesive powdery materials readily adhere to the filter surface during filtration, forming a filter cake layer that rapidly increases filtration resistance and significantly reduces recycling efficiency. While existing technologies employ cleaning methods such as vibrating motors and tapping devices, these operate at fixed frequencies and cannot adaptively adjust the cleaning intensity based on the actual filtration conditions. Therefore, it is difficult to balance recycling efficiency and filtration precision. Using fine-mesh filters to pursue higher recycling rates results in slow filtration speeds and easy clogging, while using coarse-mesh filters leads to insufficient filtration precision, allowing fine powder to penetrate the filter and become unrecoverable. An inherent contradiction exists between these two approaches. Summary of the Invention

[0004] The purpose of this invention is to provide an adaptive backflushing cleaning powdered stabilizer recovery filtration system and control method to solve the above problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adaptive backflushing cleaning powdered stabilizer recovery filtration system, comprising: a frame, a cyclone separator located at the center of the frame, a filter box located at the center of the upper end face of the cyclone separator, an induced draft fan located on one side of the center of the upper end face of the filter box, a filter structure located at the center of the interior of the filter box, an airflow backflushing structure located at the center of the upper end face of the filter structure, and a scraping structure located at both the upper and lower sides of the center of one side wall of the filter box;

[0006] The filter structure includes two fixed frames, which are respectively located at the upper and lower center of the filter box. A pull-out box is slidably connected to the center of each of the two fixed frames. A first protrusion is provided at the center of each side wall of the two pull-out boxes. A first groove is provided at the lower center of each of the two inner side walls of the two fixed frames. The four first protrusions are slidably connected to the center of the four first grooves.

[0007] Preferably, a filter screen is provided at the lower center of the interior of each of the two pull-out boxes, and the ends of each of the two pull-out boxes extend through the front inner wall of the two fixing frames and the front inner wall of the filter box to the front face of the filter box. Limiting blocks are threadedly connected to the upper and lower sides of the front face of the filter box, and the four limiting blocks abut against the two sides of the front face of the two pull-out boxes respectively.

[0008] Preferably, the two scraping structures include frames, the two frames are respectively located on the upper and lower parts of the side wall of the filter box, the inner sides of the two frames are provided with sliding grooves, and the front ends of the two frames are each equipped with a first servo motor.

[0009] Preferably, the output shaft of the first servo motor extends into the slide groove and is fixedly mounted with a threaded rod, and the threaded rod is externally threaded onto a slider.

[0010] Preferably, a scraper is fixedly provided on the top of the slider, a second protrusion is provided on the side of the slider, a matching second protrusion is provided on the inner wall of the filter box, the second protrusion is slidably assembled in the second protrusion, and the scraper is attached to the surface of the corresponding filter screen.

[0011] Preferably, the airflow backflushing structure includes four sets of support frames, which are respectively located at the front and rear positions of the upper ends of two fixed frames and are arranged at an angle, with connecting pipes installed between the upper and lower sets of support frames.

[0012] Preferably, a support pipe is rotatably mounted at the lower end of the connecting pipe, a second servo motor is mounted on the side wall of the support pipe, a first adjusting pipe is rotatably connected to the lower end of the support pipe, and a third servo motor is mounted on the side wall of the first adjusting pipe.

[0013] Preferably, a second adjusting tube is rotatably connected to the lower end of the first adjusting tube, and a fourth servo motor is installed on the side wall of the second adjusting tube.

[0014] Preferably, a third adjusting tube is rotatably connected to the lower end of the second adjusting tube, and large gears are fixedly mounted on the outer walls of the support tube, the first adjusting tube, and the second adjusting tube. Small gears are fixed to the output ends of the second servo motor, the third servo motor, and the fourth servo motor, and each of the small gears meshes with its corresponding large gear.

[0015] The present invention also provides an adaptive backflushing cleaning powdered stabilizer recovery filtration control method, wherein the adaptive backflushing cleaning powdered stabilizer recovery filtration system described above is characterized in that the control method includes the following steps:

[0016] S1. Filtration Operation: By starting the induced draft fan, the dust-containing stabilizer gas enters the cyclone separator inside the frame for preliminary dust removal. The exhaust gas after dust removal enters the filter box and is finely filtered through the filter screen at the bottom of the pull-out box in the filter structure. Powdered dust impurities are trapped on the surface of the filter screen.

[0017] S2. Differential Pressure Monitoring: The system collects the differential pressure data of the inlet and outlet of the filter box in real time. When the differential pressure value rises to the system's preset high threshold, it is determined that the filter screen is clogged, and the system automatically switches to the adaptive backflushing cleaning mode.

[0018] S3. Pre-scraping: Start the first servo motor in the scraping structure. The first servo motor drives the threaded rod inside the slide groove to rotate, which drives the threaded slider and the top scraper to move back and forth along the surface of the filter screen. This mechanically scrapes away the agglomerated and thickened dust on the surface of the filter screen. The slider is guided by the second protrusion and the second protrusion inside the filter box.

[0019] S4. Multi-angle adaptive backflushing: The second, third, and fourth servo motors of the airflow backflushing structure are activated in sequence. Each servo motor drives the corresponding pinion to rotate. Through the meshing transmission between the pinion and the large gear, the support tube, the first adjustment tube, and the second adjustment tube are driven to rotate step by step. The blowing angle and orientation of the third adjustment tube are precisely adjusted to carry out directional high-pressure airflow backflushing cleaning of different blocked areas of the filter screen.

[0020] S5. Zoned Alternating Blowing: The filter box uses two independent filter structures, scraping structures and airflow back-blowing structures inside to operate in zones. The upper and lower filter screens take turns to perform mechanical scraping and multi-angle airflow back-blowing processes. When one side of the filter screen is being cleaned, the other side of the filter screen remains in normal filtration operation, so as to achieve online cleaning without stopping the equipment.

[0021] S6. End Judgment: During the operation, the pressure difference of the filter box system is continuously monitored in real time. When the pressure difference drops to the preset low threshold of the system, all servo motors are reset to zero, the scraping structure and the airflow backflushing structure stop working, the system exits the cleaning mode, and resumes continuous and stable filter recovery operation.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This invention employs a composite cleaning system combining a mechanical scraping structure and a three-stage gear-linked multi-angle airflow backflushing structure. First, a first servo motor drives a scraper to precisely scrape away the thick layer of compacted dust on the filter screen surface, breaking up structural blockages. Then, a second, third, and fourth servo motor, in conjunction with large and small gears, drives the support tube, first adjustment tube, and second adjustment tube in multi-stage angular linkage, achieving adaptive directional blowing from any position and angle in the third adjustment tube. This dual-coupled cleaning system, combining mechanical descaling and breaking up of compacted particles with deep airflow cleaning of micropores, solves the technical pain points of traditional single backflushing, which only cleans floating dust, leaves many dead corners with residue, and easily clogs the filter screen. This improves filter screen cleanliness and equipment operational stability. The system adopts a dual-layer independent filtration, leveling, and backflushing partitioned rotation architecture, coupled with real-time differential pressure monitoring and adaptive closed-loop control logic. When the differential pressure in the filter box reaches the clogging threshold, it automatically triggers a rotation mode of single-zone cleaning and single-zone continuous filtration. One side of the filter screen is scraped and cleaned with multi-angle backflushing, while the other side of the filter screen maintains negative pressure filtration. The entire process requires no machine shutdown or production interruption. At the same time, the system intelligently starts and stops and automatically resets based on the high and low differential pressure thresholds, realizing fully automatic intelligent operation with self-identification of clogging, self-adaptation of cleaning, and self-recovery of operating conditions. This solves the technical problems of traditional equipment such as downtime for dust cleaning, discontinuous operation, excessive manual intervention, and poor adaptability to operating conditions, significantly improving the continuity and automation level of powdered stabilizer recovery filtration. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the three-dimensional disassembled structure of the filter box of the present invention. Figure 1 ;

[0026] Figure 3 This is a schematic diagram of the three-dimensional disassembled structure of the filter box of the present invention. Figure 2 ;

[0027] Figure 4 This is a schematic diagram of the three-dimensional disassembled structure of the filter box of the present invention. Figure 3 ;

[0028] Figure 5 This is a three-dimensional disassembled structural diagram of the pull-out box of the present invention;

[0029] Figure 6 This is a partial three-dimensional structural diagram of the airflow backflushing structure of the present invention;

[0030] Figure 7 for Figure 4 A magnified structural diagram of point A in the middle.

[0031] In the diagram: 1. Frame; 2. Cyclone separator; 3. Filter box; 4. Exhaust fan; 5. Filter structure; 501. Fixing frame; 502. Pull-out box; 503. First protrusion; 504. First groove; 505. Filter screen; 506. Limiting block; 6. Scraping structure; 601. Frame; 602. Slide groove; 603. First servo motor; 604. Threaded rod; 605. Slider; 606. Scraper; 607. Second protrusion; 608. Second groove; 7. Airflow backflushing structure; 701. Support frame; 702. Connecting pipe; 703. Support pipe; 704. Second servo motor; 705. First adjusting pipe; 706. Third servo motor; 707. Second adjusting pipe; 708. Fourth servo motor; 709. Third adjusting pipe; 710. Small gear; 711. Large gear. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" 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 communication 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. The following describes embodiments of the invention based on its overall structure.

[0034] Reference Figures 1 to 7In this embodiment of the invention, the adaptive backflushing cleaning powdered stabilizer recovery filtration system includes: a frame 1, a cyclone separator 2 located at the center of the frame 1, a filter box 3 located at the center of the upper end face of the cyclone separator 2, an induced draft fan 4 located on one side of the center of the upper end face of the filter box 3, a filter structure 5 located at the center of the interior of the filter box 3, an airflow backflushing structure 7 located at the center of the upper end face of the filter structure 5, and a scraping structure 6 located at the upper and lower sides of the center of one side wall of the filter box 3.

[0035] When the equipment is officially started, the induced draft fan 4 installed on the upper side of the filter box 3 is turned on first. Through the suction action of the induced draft fan 4, a stable negative pressure environment is formed in the internal cavity of the frame 1, cyclone separator 2 and filter box 3, so that the mixed gas containing powdered stabilizer dust is continuously drawn into the equipment. The dust-laden mixed gas first enters the cyclone separator 2 installed in the center of the frame 1. Using the centrifugal separation principle of the cyclone separator 2, the powdered stabilizer dust with larger particle diameter and heavier mass in the mixed gas is separated by rotation and sedimentation. This achieves the first coarse filtration pretreatment of the dust-laden gas, effectively intercepting large dust particles and avoiding large impurities from directly impacting the downstream filter structure, greatly reducing the downstream fine filtration pressure. The gas purified by coarse filtration flows upward and smoothly enters the internal cavity of the filter box 3 connected to the upper end of the cyclone separator 2.

[0036] The filter structure 5 includes two fixed frames 501, which are respectively located at the upper and lower center of the filter box 3. A pull-out box 502 is slidably connected to the center of each fixed frame 501. A first protrusion 503 is provided at the center of each side wall of the two pull-out boxes 502. A first groove 504 is provided at the lower center of each inner side wall of the two fixed frames 501. The four first protrusions 503 are slidably connected to the center of the four first grooves 504. A filter screen 505 is provided at the lower center of each pull-out box 502. The ends of the two pull-out boxes 502 extend through the front inner wall of the two fixed frames 501 and the front inner wall of the filter box 3 to the front face of the filter box 3. Limiting blocks 506 are threadedly connected to the upper and lower sides of the front face of the filter box 3. The four limiting blocks 506 abut against the two sides of the front face of the two pull-out boxes 502.

[0037] Dust-laden gas entering the filter box 3 passes evenly through the two independent filter structures 5 operating zones. The microporous trapping effect of the filter screen 505 precisely intercepts fine powdered stabilizer dust. The gas medium can normally pass through the micropores of the filter screen 505 and be discharged outwards, while the fine powdered stabilizer particles suspended in the gas are blocked and retained on the surface of the filter screen 505 and between the micropores. This achieves effective recovery of the powdered stabilizer and purification of the gas to meet emission standards. Under long-term continuous filtration conditions, fine dust will continuously accumulate and pile up on the surface of the filter screen 505, gradually forming a dust accumulation layer. Due to the influence of airflow humidity, wind pressure, and the stickiness of dust, loose dust will gradually compact, clump, and solidify, blocking the micropore channels of the filter screen. The equipment is equipped with a pull-out filter screen 505 with micropore channels, and the pull-out box 502 with positioning and locking structure 5 is equipped with a pull-out box to ensure the sealing of the filtration conditions during normal operation of the equipment, preventing problems such as negative pressure leakage, airflow short circuit, and dust escape. At the same time, the pull-out box 502 can be quickly unlocked and disassembled during equipment shutdown and maintenance by loosening the limit block 506, meeting the needs of later operation and maintenance cleaning and ensuring the long-term stable filtration conditions of the equipment.

[0038] To achieve adaptive intelligent start-stop during cleaning operations, the system is equipped with real-time differential pressure monitoring logic. The differential pressure value between the inlet and outlet of filter box 3 is used as the core criterion for determining the degree of filter clogging. When filter screen 505 is not clogged, the micropores of the filter screen are unobstructed and the air resistance is low, and the equipment differential pressure is maintained within the normal operating range. As dust accumulates and the degree of caking on filter screen 505 intensifies, the ventilation cross-sectional area of ​​the filter screen continues to decrease, and the airflow resistance increases significantly, which is directly reflected in the continuous linear increase of the inlet and outlet differential pressure. The system collects, calculates, and compares differential pressure data in real time. When the monitored differential pressure reaches the preset high clogging threshold, the system intelligently determines that the filtration performance of filter screen 505 has failed and a clogging condition has formed. It immediately and automatically triggers the adaptive cleaning control program, prioritizing the mechanical scraping cleaning condition of scraping structure 6 to pre-destroy the stubborn dust that has hardened and accumulated on the surface of filter screen 505, clearing structural blockage obstacles for subsequent airflow backflushing.

[0039] The two scraping structures 6 include frames 601, which are respectively located on the upper and lower sides of the filter box 3. The inner sides of the two frames 601 are provided with sliding grooves 602. The front ends of the two frames 601 are each equipped with a first servo motor 603. The output shaft of the first servo motor 603 extends into the sliding groove 602 and is fixedly installed with a threaded rod 604. The threaded rod 604 is externally threaded with a slider 605. A scraper 606 is fixedly provided on the top of the slider 605. A second protrusion 607 is provided on the side of the slider 605. A matching second protrusion 608 is provided on the inner wall of the filter box 3. The second protrusion 607 is slidably assembled in the second protrusion 608. The scraper 606 is attached to the surface of the corresponding filter screen 505.

[0040] When the pressure difference reaches the set upper limit, the control system starts the cleaning program. Thick deposits on the surface of the filter screen 505 are removed through mechanical rigid scraping. After the operation starts, the first servo motor 603 of the scraping structure 6 outputs power to drive the transmission mechanism, precisely converting the motor's rotational kinetic energy into the horizontal linear reciprocating kinetic energy of the scraper 606. This ensures that the scraper 606 remains in contact with the surface of the filter screen 505, performing a uniform reciprocating sweeping operation. Relying on the precise sliding guide limit logic formed by the cooperation of the second protrusion 607 and the second groove 608, the scraper 606 operates without deviation, jamming, or shaking throughout the entire process, ensuring smooth scraping. The process fully covers the entire effective filtration area of ​​filter screen 505. Under the rigid scraping action of scraper 606, the compacted, hardened, and firmly bonded dust clumps on the surface of filter screen 505 are completely peeled off, scraped off, and broken up. This completely breaks down the large-area blockage structure on the surface of filter screen 505, significantly clears the ventilation pores on the surface of the filter screen, eliminates the obstruction of airflow by thick dust, and allows the subsequent high-pressure backflushing airflow to smoothly penetrate into the deep micropores of the filter screen. This greatly improves the cleaning efficiency and thoroughness of deep fine dust, making up for the technical deficiency of traditional single backflushing cleaning mode, which can only remove floating dust and cannot remove clumps.

[0041] The airflow backflushing structure 7 includes four sets of support frames 701, which are respectively located at the front and rear positions of the upper ends of two fixed frames 501 and are arranged at an angle. Connecting pipes 702 are installed between the upper and lower sets of support frames 701. A support pipe 703 is rotatably installed at the lower end of the connecting pipe 702. A second servo motor 704 is mounted on the side wall of the support pipe 703. A first adjusting pipe 705 is rotatably connected to the lower end of the support pipe 703. A third servo motor 706 is mounted on the side wall of the first adjusting pipe 705. The first adjusting pipe 705... The second adjustment tube 707 is rotatably connected to the end of the second adjustment tube 707. The fourth servo motor 708 is installed on the side wall of the second adjustment tube 707. The third adjustment tube 709 is rotatably connected to the lower end of the second adjustment tube 707. The large gear 711 is fixedly mounted on the outer wall of the support tube 703, the first adjustment tube 705 and the second adjustment tube 707. The small gear 710 is fixed at the output end of the second servo motor 704, the third servo motor 706 and the fourth servo motor 708. Each small gear 710 meshes with its corresponding large gear 711.

[0042] After the mechanical scraping pretreatment is completed, the system automatically switches to the multi-angle adaptive high-pressure airflow backflushing mode of the airflow backflushing structure 7. This mode performs deep and fine cleaning of the micropores of the filter screen 505, the dead corners of the filter screen, and the fine residual dust that the scraper 606 cannot reach. This mode adopts a multi-stage adjustable backflushing airflow jet logic, relying on the multi-stage pipeline linkage adjustment structure composed of the support pipe 703, the first adjustment pipe 705, the second adjustment pipe 707, and the third adjustment pipe 709 to realize the jet direction, angle, and range. The all-area adaptive adjustment of the filter screen is different from the traditional fixed backflushing system, which can only clean fixed points and has large blind spots. The high-pressure airflow is continuously supplied through the backflushing pipeline connected by the connecting pipe 702, and is ejected through the third adjustment pipe at the end 709. The high-speed high-pressure airflow washes the filter micropores from the back side of the filter screen 505. By using the impact, penetration and peeling effect of the high-pressure airflow, the highly adhesive fine dust particles embedded in the micropores of the filter screen 505 are blown away from the filter screen matrix, so as to thoroughly unclog the deep pores of the filter screen.

[0043] The core adaptive adjustment principle of the airflow backflushing relies on the precise power matching of the second servo motor 704, the third servo motor 706, the fourth servo motor 708 and the corresponding pinion 710 and gear 711 meshing transmission. Each set of servo motors can independently output precise power. Through the meshing speed change and force transmission of the pinion 710 and gear 711, the support tube 703, the first adjustment tube 705, and the second adjustment tube 707 are independently driven to rotate and deflect. Through the linkage fine adjustment and angle superposition of the three-stage pipeline, the precise orientation adjustment of the end third adjustment tube 709 in multiple dimensions, multiple angles, and all directions can be achieved. It can adaptively adjust the airflow injection angle, injection distance, and injection coverage according to the degree of blockage in different areas of the filter screen 505. It can perform targeted, fixed-point, and quantitative precise blowing on the central blockage area, edge dead corner area, and locally heavily blocked area of ​​the filter screen 505, completely eliminating cleaning blind spots and ensuring that the pores of the entire filter screen 505 can be cleaned by uniform and thorough high-pressure airflow, achieving a full-area adaptive cleaning effect without dead corners of the filter screen.

[0044] The working principle of this invention is as follows: When this equipment is working, the induced draft fan 4 is started to form a negative pressure airflow field inside the frame 1, cyclone separator 2 and filter box 3. The mixed gas containing powdered stabilizer first enters the cyclone separator 2, and the centrifugal action is used to achieve coarse separation of large dust particles, reducing the downstream filtration load. The pretreated gas enters the filter box 3.

[0045] Gas flows through the filter screen 505 of the filter structure 5. Fine powder dust is trapped on the surface of the filter screen 505, and clean gas is discharged, realizing the recovery of stabilizer. The pull box 502 is disassembled and assembled by sliding cooperation between the first protrusion 503 and the first protrusion 504. It is locked with the limit block 506 to ensure the filter sealing. During the long-term operation of the equipment, dust on the surface of the filter screen 505 will continuously accumulate, compact, and block, causing the pressure difference between the inlet and outlet of the filter box 3 to continuously increase.

[0046] When the pressure difference reaches the preset high threshold, the system automatically triggers the cleaning program and starts the scraping structure 6. The first servo motor 603 drives the threaded rod 604 to drive the slider 605 and scraper 606 to reciprocate. The scraper 606 is guided and limited by the second protrusion 607 and the second groove 608, so that the scraper 606 is in contact with the surface of the filter screen 505 to scrape off the hardened dust and complete the pre-treatment of the filter screen for descaling.

[0047] After mechanical scraping is completed, the system activates the airflow backflushing structure 7. The second servo motor 704, the third servo motor 706, and the fourth servo motor 708 are driven by the meshing of the small gear 710 and the large gear 711, respectively, to drive the support tube 703, the first adjustment tube 705, and the second adjustment tube 707 to deflect at multiple angles and adjust the spray direction of the third adjustment tube 709. This enables adaptive, high-pressure backflushing of the entire filter screen 505 without dead angles, thoroughly removing residual dust from the micropores.

[0048] The equipment employs an alternating cleaning mode with upper and lower dual-layer filtration units, ensuring continuous filtration on the other side while one side is being cleaned, enabling uninterrupted online operation. When the system monitors the differential pressure and it drops to a preset low threshold, all servo mechanisms automatically reset, and the equipment resumes normal continuous filtration operation, completing the adaptive cyclic cleaning process.

[0049] The present invention also provides an adaptive backflushing cleaning powdered stabilizer recovery filtration control method. Based on the above-described adaptive backflushing cleaning powdered stabilizer recovery filtration system, the control method includes the following steps:

[0050] S1. Filtration operation: By starting the induced draft fan 4, the dust-containing stabilizer gas enters the cyclone separator 2 inside the frame 1 for preliminary dust removal. The exhaust gas after dust removal enters the filter box 3 and is finely filtered by the filter screen 505 at the bottom of the pull-out box 502 in the filter structure 5. Powdered dust impurities are trapped on the surface of the filter screen 505.

[0051] S2. Differential Pressure Monitoring: The system collects the differential pressure data of the inlet and outlet of the filter box 3 in real time. When the differential pressure value rises to the system's preset high threshold, it is determined that the filter screen 505 is clogged, and the system automatically switches to the adaptive backflushing cleaning mode.

[0052] S3. Pre-scraping: Start the first servo motor 603 in the scraping structure 6. The first servo motor 603 drives the threaded rod 604 inside the slide groove 602 to rotate, which drives the threaded slider 605 and the top scraper 606 to move back and forth along the surface of the filter screen 505, and mechanically scrape off the agglomerated and thickened dust on the surface of the filter screen 505 for pre-treatment. The slider 605 is guided by the second protrusion 607 cooperating with the second protrusion 608 inside the filter box 3.

[0053] S4. Multi-angle adaptive backflushing: The second servo motor 704, the third servo motor 706, and the fourth servo motor 708 of the airflow backflushing structure 7 are activated in sequence. Each servo motor drives the corresponding pinion 710 to rotate. Through the meshing transmission between the pinion 710 and the large gear 711, the support tube 703, the first adjustment tube 705, and the second adjustment tube 707 are driven to rotate step by step. The blowing angle and orientation of the third adjustment tube 709 are precisely adjusted to carry out directional high-pressure airflow backflushing cleaning of different clogging areas of the filter screen 505.

[0054] S5, Zoned Alternating Blowing: The filter box 3 uses two independent filter structures 5, scraping structure 6 and airflow back-blowing structure 7 inside to operate in zones. The upper and lower filter screens 505 alternately perform mechanical scraping and multi-angle airflow back-blowing processes. When one side of the filter screen is being cleaned, the other side of the filter screen remains in normal filtration working state, so as to achieve online cleaning without stopping the equipment.

[0055] S6. End Judgment: During the operation, the pressure difference of the filter box 3 system is continuously monitored in real time. When the pressure difference drops to the system's preset low threshold, all servo motors are reset to zero, the leveling structure 6 and the airflow backflushing structure 7 stop operating, the system exits the cleaning mode, and resumes continuous and stable filter recovery operation.

[0056] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An adaptive backflushing cleaning powdered stabilizer recovery filtration system, characterized in that, include: A frame (1) is provided with a cyclone separator (2) at the center of the frame (1), a filter box (3) is provided at the center of the upper end face of the cyclone separator (2), an induced draft fan (4) is provided at one side of the center of the upper end face of the filter box (3), a filter structure (5) is provided at the center of the inside of the filter box (3), an airflow back-blowing structure (7) is provided at the center of the upper end face of the filter structure (5), and a scraping structure (6) is provided at the upper and lower sides of the center of one side wall of the filter box (3). The filter structure (5) includes two fixing frames (501), which are respectively located at the upper and lower center of the filter box (3). A pull-out box (502) is slidably connected to the center of each of the two fixing frames (501). A first protrusion (503) is provided at the center of each of the two side walls of the pull-out box (502). A first groove (504) is provided at the lower center of each of the two inner side walls of the two fixing frames (501). The four first protrusions (503) are slidably connected to the center of each of the four first grooves (504).

2. The adaptive backflushing cleaning powdered stabilizer recovery filtration system according to claim 1, characterized in that, Both of the pull-out boxes (502) have a filter screen (505) located at the lower center of their interiors. The ends of both pull-out boxes (502) extend through the inner front walls of the two fixing frames (501) and the inner front wall of the filter box (3) to the front end face of the filter box (3). Limiting blocks (506) are threadedly connected to the upper and lower sides of the front end face of the filter box (3). The four limiting blocks (506) abut against the two sides of the front end face of the two pull-out boxes (502).

3. The adaptive backflushing cleaning powdered stabilizer recovery filtration system according to claim 2, characterized in that, The two scraping structures (6) include frames (601), the two frames (601) are respectively located on the upper and lower parts of the side wall of the filter box (3), the inner side of the two frames (601) is provided with a sliding groove (602), and the front end of the two frames (601) is equipped with a first servo motor (603).

4. The adaptive backflushing cleaning powdered stabilizer recovery filtration system according to claim 3, characterized in that, The output shaft of the first servo motor (603) extends into the slide groove (602) and is fixedly installed with a threaded rod (604), and the threaded rod (604) is externally threaded to assemble a slider (605).

5. The adaptive backflushing cleaning powdered stabilizer recovery filtration system according to claim 4, characterized in that, The top of the slider (605) is fixedly provided with a scraper (606), the side of the slider (605) is provided with a second protrusion (607), the inner wall of the filter box (3) is provided with a matching second protrusion (608), the second protrusion (607) is slidably assembled in the second protrusion (608), and the scraper (606) is attached to the surface of the corresponding filter screen (505).

6. The adaptive backflushing cleaning powdered stabilizer recovery filtration system according to claim 1, characterized in that, The airflow backflushing structure (7) includes four sets of support frames (701). The four sets of support frames (701) are respectively located at the front and rear positions of the upper end of two fixed frames (501) and are arranged at an angle. Connecting pipes (702) are installed between the upper and lower sets of support frames (701).

7. The adaptive backflushing cleaning powdered stabilizer recovery filtration system according to claim 6, characterized in that, The lower end of the connecting pipe (702) is rotatably mounted with a support pipe (703), the side wall of the support pipe (703) is equipped with a second servo motor (704), the lower end of the support pipe (703) is rotatably connected with a first adjusting pipe (705), and the side wall of the first adjusting pipe (705) is equipped with a third servo motor (706).

8. The adaptive backflushing cleaning powdered stabilizer recovery filtration system according to claim 7, characterized in that, The lower end of the first adjustment tube (705) is rotatably connected to the second adjustment tube (707), and the side wall of the second adjustment tube (707) is equipped with a fourth servo motor (708).

9. The adaptive backflushing cleaning powdered stabilizer recovery filtration system according to claim 8, characterized in that, The lower end of the second adjustment tube (707) is rotatably connected to the third adjustment tube (709). The outer walls of the support tube (703), the first adjustment tube (705) and the second adjustment tube (707) are all fixedly fitted with large gears (711). The output ends of the second servo motor (704), the third servo motor (706) and the fourth servo motor (708) are all fixed with small gears (710). Each of the small gears (710) meshes with its corresponding large gear (711).

10. An adaptive backflushing cleaning powdered stabilizer recovery filtration control method, comprising the adaptive backflushing cleaning powdered stabilizer recovery filtration system according to any one of claims 1-9, characterized in that, The control method includes the following steps: S1. Filtration operation: By starting the induced draft fan (4), the dust-containing stabilizer gas enters the cyclone separator (2) inside the frame (1) for preliminary dust removal. The exhaust gas after dust removal enters the filter box (3) and is finely filtered through the filter screen (505) at the bottom of the pull-out box (502) in the filter structure (5). Powdered dust impurities are trapped on the surface of the filter screen (505). S2, Differential Pressure Monitoring: The system collects the differential pressure data of the inlet and outlet of the filter box (3) in real time. When the differential pressure value rises to the system's preset high threshold, it is determined that the filter screen (505) is blocked, and the system automatically switches to the adaptive backflushing cleaning mode. S3, Pre-scraping: Start the first servo motor (603) in the scraping structure (6). The first servo motor (603) drives the threaded rod (604) inside the slide groove (602) to rotate, which drives the threaded slider (605) and the top scraper (606) to move back and forth along the surface of the filter screen (505) to mechanically scrape off the agglomerated and thickened dust on the surface of the filter screen (505). The slider (605) is guided by the second protrusion (607) and the second protrusion (608) inside the filter box (3). S4, Multi-angle adaptive backflushing: The second servo motor (704), the third servo motor (706), and the fourth servo motor (708) of the airflow backflushing structure (7) are started in sequence. Each servo motor drives the corresponding small gear (710) to rotate. Through the meshing transmission between the small gear (710) and the large gear (711), the support tube (703), the first adjustment tube (705), and the second adjustment tube (707) are driven to rotate step by step. The blowing angle and orientation of the third adjustment tube (709) are precisely adjusted to carry out directional high-pressure airflow backflushing cleaning of different blockage areas of the filter screen (505). S5, Zoned Alternating Blowing: Using the two independent filter structures (5), scraping structure (6) and airflow backflushing structure (7) inside the filter box (3) to perform zoned operations, the upper and lower filter screens (505) alternately perform mechanical scraping and multi-angle airflow backflushing processes. When one side of the filter screen is being cleaned, the other side of the filter screen remains in normal filtration working state, so as to achieve online cleaning without stopping the equipment. S6. End judgment: During the operation, the pressure difference of the filter box (3) system is continuously monitored in real time. When the pressure difference drops to the preset low threshold of the system, all servo motors are reset to zero, the scraping structure (6) and the airflow backflushing structure (7) stop working, the system exits the cleaning mode, and resumes continuous and stable filter recycling operation.

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