Polyurethane anti-yellowing agent filtering and purifying equipment

Abstract

This invention discloses a filtration and purification device for polyurethane anti-yellowing agents, belonging to the field of polyurethane anti-yellowing agent production technology. The device includes a primary filtration mechanism comprising a filter cylinder with a central through-tube fixedly connected to its center. A water inlet is provided on the outer wall of the central through-tube, and a central filter element is mounted on the outer side of the central through-tube. An edge filter assembly is provided between the collection chamber and the central filter element. A centrifugal drive is located below the central filter element to drive the material inside the filter cylinder to rotate. This invention uses a centrifugal drive to rotate the material, causing it to pre-classify in the centrifugal force field generated by high-speed rotation. Large particles and gel impurities are forcibly thrown to the periphery, achieving active anti-fouling filtration of high-viscosity, easily gelling materials. This significantly improves the filtration flux and membrane area utilization rate, enhancing the stability and efficiency of the filtration process.

Description

Technical Field

[0001] This invention relates to the field of polyurethane anti-yellowing agent production technology, and in particular to a polyurethane anti-yellowing agent filtration and purification device. Background Technology

[0002] As a key additive in polymer materials, the purity of polyurethane anti-yellowing agents directly determines the anti-yellowing performance and appearance quality of the final product. In the filtration and purification stage, current mainstream technologies mainly rely on plate and frame filtration, bag filtration, or a combination of these with cross-flow membrane filtration.

[0003] However, polyurethane anti-yellowing agent synthetic liquids generally possess high viscosity and are prone to forming submicron or even nanoscale gels, posing challenges to traditional filtration technologies. Specifically, pumping high-viscosity fluids consumes extremely high energy, and it is difficult to effectively prevent the bridging and deep clogging of flexible gels at the membrane pores, leading to a rapid decline in filtration flux, resulting in low production efficiency, high operating costs, and difficulty in ensuring batch-to-batch stability and consistency. Therefore, improvements are necessary. Summary of the Invention

[0004] This invention provides a polyurethane anti-yellowing agent filtration and purification device, which can solve the problems in the prior art of high pumping energy consumption and the tendency of flexible gel to bridge and deeply clog at the membrane pores, leading to a decrease in production efficiency when filtering high viscosity fluids.

[0005] This invention provides a polyurethane anti-yellowing agent filtration and purification device, including a primary filtration mechanism and a secondary filtration mechanism. The primary filtration mechanism includes a filter cylinder, a central through-tube fixedly connected to the middle of the filter cylinder, a water inlet on the outer wall of the central through-tube, a central filter element covering the outer side of the central through-tube, a collection chamber inside the side wall of the filter cylinder, and one side of the collection chamber fixedly connected to the secondary filtration mechanism via a clear liquid pipe. An edge filter assembly is provided between the collection chamber and the central filter element, and a centrifugal drive for driving the material inside the filter cylinder to rotate is provided below the central filter element.

[0006] As a further aspect of the present invention: the central filter element includes a central filter membrane, and fixed disks are provided on both the upper and lower sides of the central filter membrane. A plurality of fixed rods are fixedly connected between the two fixed disks, and the plurality of fixed rods are fixedly connected to the inner side of the filter membrane. The two fixed disks are fixedly connected to a central through pipe. An upper movable disk and a lower movable disk are rotatably connected to the edges of the two fixed disks, respectively. A plurality of movable rods are fixedly connected between the upper movable disk and the lower movable disk, and the plurality of movable rods are fixedly connected to the outer side of the filter membrane. An adjusting element for driving the upper movable disk to rotate is provided on one side of the upper movable disk.

[0007] As a further aspect of the present invention: the adjusting component includes a docking turntable, the edge of which is provided with docking tooth grooves, an adjusting motor is fixedly installed on one side of the filter cylinder, and an adjusting gear is fixedly connected to the output end of the adjusting motor, the adjusting gear meshing with the docking tooth grooves.

[0008] As a further aspect of the present invention: the edge filter assembly includes a mounting ring, which is fixedly connected to the inner wall of the filter cylinder. An outer filter cover is fixedly connected to the inner wall of the mounting ring. An inner filter cover is slidably disposed on the inner side of the outer filter cover. A push ring is fixedly connected to the bottom of the inner filter cover. A lifting cylinder is disposed below the push ring. A lifting push rod is fixedly connected to the output end of the lifting cylinder. The top of the lifting push rod is fixedly connected to the bottom of the push ring. A side filter membrane is fixedly installed in the middle of both the outer filter cover and the inner filter cover.

[0009] As a further embodiment of the present invention: an outer cleaning ring is fixedly connected to the top of the inner wall of the outer filter cover, and a plurality of outer cleaning ports are opened on the side of the outer cleaning ring near the inner filter cover. An inner cleaning ring is fixedly connected to one side of the push ring, and a plurality of inner cleaning ports are opened on the side of the inner cleaning ring near the outer filter cover. Cleaning nozzles are fixedly installed on the inner walls of the plurality of outer cleaning ports and the plurality of inner cleaning ports.

[0010] As a further embodiment of the present invention: an inward cleaning plate is fixedly connected to the top of the inner filter cover, the top of the inward cleaning plate is set as an inclined surface, an inner spray nozzle is opened on the side of the inward cleaning plate near the central filter element, and a diverting spray pipe is fixedly connected inside the inner spray nozzle.

[0011] As a further aspect of the present invention: the centrifugal drive component includes a drive motor, the output end of the drive motor is fixedly connected to a drive sleeve, the outer wall of the drive sleeve is fixedly connected to a plurality of inclined drive plates, and the bottom edge of the lower movable disc is provided with a plurality of reflux ports.

[0012] As a further embodiment of the present invention: the secondary filtration mechanism includes an inlet pressurizing component and a filter membrane conversion platform. The inlet pressurizing component includes a mounting frame, a pressurizing pump is fixedly installed inside the mounting frame, a docking cylinder is fixedly installed in the middle of the mounting frame, and a pressurizing connector is fixedly connected to the output end of the docking cylinder. The pressurizing connector has several flow guiding chambers in the middle and several flow guiding grooves at the bottom. The top of each of the flow guiding grooves communicates with the bottom of the flow guiding chambers. A receiving plate is rotatably connected to the top of the filter membrane conversion platform. Several membrane installation ports are opened on the top of the receiving plate. Ultrafiltration membrane components are fixedly installed on the inner walls of each of the membrane installation ports. A diversion water delivery component is provided between the output end of the pressurizing pump and the pressurizing connector.

[0013] As a further aspect of the present invention: the diversion water delivery assembly includes a diversion ring, the top of the diversion ring is fixedly connected to the bottom of the mounting frame, a plurality of fixed diversion pipes are fixedly connected to the bottom of the diversion ring, a movable diversion pipe is slidably connected to the bottom of each of the fixed diversion pipes, and the bottom of each of the movable diversion pipes is connected to the guide cavity.

[0014] As a further aspect of the present invention: a base is provided below the filter membrane conversion table, a drainage groove is provided on the top of the base corresponding to one side of the pressure connector, a drainage pipe is fixedly connected to one side of the drainage groove, a conversion motor is fixedly installed inside the base, and the output end of the conversion motor is fixedly connected to the bottom of the receiving plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention drives the material to rotate centrifugally by setting a centrifugal drive, so that the material is pre-classified in the centrifugal force field generated by high-speed rotation. Large particles and gel impurities are forced to be thrown to the periphery. At the same time, the rotating flow field drives the material to penetrate the adjustable central filter membrane and the edge double-layer filter assembly from the center to the periphery in a uniform and multi-angle manner. This realizes active anti-fouling filtration of high viscosity and easily gelled materials. It not only greatly improves the filtration flux and membrane area utilization rate, but also effectively avoids the problem of rapid flux decline caused by gel clogging the membrane pores in traditional filtration by physical centrifugal force, thus improving the stability and efficiency of the filtration process. This invention fixes the outer edge of the central filter membrane by setting a rotatable movable disk and a movable rod. During operation, the pleat shape of the central filter membrane can be changed by adjusting the motor, and the inner filter cover can be raised and lowered by the lifting push rod, so as to flexibly adapt to the filtration accuracy requirements of different material states. This invention, by setting up a distributed cleaning nozzle network consisting of an inner cleaning ring, an outer cleaning ring, and an inward cleaning plate, as well as a liftable inner filter cover, can automatically clean all filter membranes without interrupting production. This achieves a revolutionary maintenance method, moving from shutdown disassembly and cleaning to automatic cleaning, significantly reducing equipment maintenance time, ensuring production continuity, and extending the service life of core filter elements. Attached Figure Description Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a cross-sectional schematic diagram of the primary filtration mechanism of the present invention; Figure 3 This is a three-dimensional schematic diagram of the primary filtration mechanism of the present invention. Figure 1 ; Figure 4 This is a top cross-sectional view of the central filter element of the present invention; Figure 5 This is a three-dimensional schematic diagram of the primary filtration mechanism of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the working state of the edge filtering component of the present invention; Figure 7 This is a three-dimensional schematic diagram of the water inlet pressurization component of the present invention; Figure 8 This is a cross-sectional schematic diagram of the water inlet pressurization component of the present invention; Figure 9 This is a three-dimensional schematic diagram of the filter membrane conversion stage of the present invention; Figure 10 This is a cross-sectional schematic diagram of the filter membrane conversion stage of the present invention.

[0016] Explanation of reference numerals in the attached figures: 101. Filter cartridge; 102. Central through-pipe; 103. Water inlet; 104. Fixed plate; 105. Fixed rod; 106. Movable rod; 107. Central filter membrane; 108. Upper movable plate; 109. Lower movable plate; 110. Collection chamber; 111. Clear liquid pipe; 112. Mounting ring; 113. Outer filter cover; 114. Inner filter cover; 115. Outer cleaning ring; 116. Inner cleaning ring; 117. Inner cleaning plate; 118. Lifting push rod; 119. Drive motor; 120. Drive sleeve; 121. Drive plate; 122. Docking turntable; 123. Return port; 124. Push ring; 201. Mounting bracket; 202. Pressurizing pump; 203. Docking cylinder; 204. Diverting ring; 206. Fixed diverting pipe; 207. Movable diverting pipe; 208. Pressurizing connector; 209. Guide cavity; 210. Guide groove; 211. Base; 212. Receiving plate; 213. Membrane mounting port; 214. Ultrafiltration membrane module; 215. Drainage groove; 216. Drainage pipe; 217. Conversion motor; 218. Pressing groove; 219. Pressing sealing block. Detailed Implementation

[0017] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0018] like Figures 1 to 2As shown in the embodiment of the present invention, a polyurethane anti-yellowing agent filtration and purification device is provided, including a primary filtration mechanism and a secondary filtration mechanism. The primary filtration mechanism includes a filter cylinder 101, a central through pipe 102 fixedly connected to the middle of the filter cylinder 101, a water inlet 103 opened on the outer wall of the central through pipe 102, and a central filter element covered on the outer side of the central through pipe 102. By setting the central through pipe 102 to feed the material from the middle, and with the central filter element set around the central through pipe 102, the material is fully coated and filtered. Compared with the traditional single-layer membrane filtration method, the material diffuses to the surrounding areas and passes through the various positions of the central filter element in different directions. After multiple filtrations, the filtration effect is better, and the filter element is also more fully utilized. A collection chamber 110 is provided inside the side wall of the filter cylinder 101. Several collection grooves are provided on the side of the collection chamber 110 near the middle of the filter cylinder 101. The filtered material is collected and discharged through the collection chamber 110 to improve the filtration effect. An edge filter assembly is provided between the collection chamber 110 and the central filter element. A centrifugal drive is provided below the central filter element to drive the material inside the filter cylinder 101 to rotate. The centrifugal drive drives the material inside the filter cylinder 101 to rotate, and the centrifugal force pushes large particles of impurities in the material to the edge, which facilitates their filtration and separation. At the same time, the rotation of the material can also improve the contact rate between the material and the central filter element and the side filter assembly. A slag discharge port is provided on one side of the bottom of the filter cylinder 101. A slag discharge pipe is fixedly connected to the inner wall of the slag discharge port to discharge the material residue obtained from filtration. One side of the collection chamber 110 is fixedly connected to the secondary filtration mechanism through the clear liquid pipe 111. The added secondary filtration mechanism realizes secondary filtration of the material to further improve the purity of the material.

[0019] Please see Figures 2-4The central filter element includes a central filter membrane 107. Fixed discs 104 are provided on both the upper and lower sides of the central filter membrane 107. Several fixed rods 105 are fixedly connected between the two fixed discs 104, and each fixed rod 105 is fixedly connected to the inner side of the filter membrane. Both fixed discs 104 are fixedly connected to a central passage pipe 102. An upper movable disc 108 and a lower movable disc 109 are rotatably connected to the edges of the two fixed discs 104, respectively. Several movable rods 106 are fixedly connected between the upper movable disc 108 and the lower movable disc 109, and each movable rod 106 is fixedly connected to the outer side of the filter membrane. The central filter membrane 107 is stably supported and limited by several movable rods 106 and several fixed rods 105, ensuring that its posture is in a stable unfolded state and avoiding the problem of reduced filtration effect due to excessive folding and twisting. Since the movable plate can rotate, and an adjustment component is provided on one side of the upper movable plate 108, the upper movable plate 108 is driven to rotate by the adjustment component, which in turn drives each movable rod 106 to rotate, thereby adjusting the posture and position of the central filter membrane 107. This allows the material to pass through the central filter membrane 107 from different angles and positions during the movement, thereby adjusting the filtration effect.

[0020] In another embodiment, the movable rod 106 can also be configured as a rotatable connection, that is, the upper and lower ends of the movable rod 106 are rotatably connected to the upper movable disk 108 and the lower movable disk 109 respectively; thereby expanding the range of motion of the central filter membrane 107, allowing it to present different postures and achieving adjustment of the filtration effect.

[0021] In one embodiment, the adjusting component can be used to drive the upper movable disk 108 to rotate, and the specific structure can be implemented with reference to existing technical means. This embodiment provides a feasible adjusting component structure, which includes a docking turntable 122. The edge of the docking turntable 122 is provided with a docking tooth groove. An adjusting motor (not shown in the figure) is fixedly installed on one side of the filter cylinder 101. An adjusting gear is fixedly connected to the output end of the adjusting motor. Specifically, a rotating sealing groove is provided on the side wall of the docking cylinder corresponding to the position of the docking turntable 122. The edge of the docking turntable is rotatably set in the rotating sealing groove. Sealing gaskets are fixedly connected to both the upper and lower side walls of the rotating sealing groove. An opening is opened on the side of the rotating sealing groove facing the adjusting motor. One side of the adjusting gear passes through the opening and meshes with the docking tooth groove.

[0022] In one embodiment, see Figure 2 and Figure 6The edge filter assembly includes a mounting ring 112, which is fixedly connected to the inner wall of the filter cylinder 101. An outer filter cover 113 is fixedly connected to the inner wall of the mounting ring 112. An inner filter cover 114 is slidably disposed on the inner side of the outer filter cover 113. A push ring 124 is fixedly connected to the bottom of the inner filter cover 114. A lifting cylinder is disposed below the push ring 124. A lifting push rod 118 is fixedly connected to the output end of the lifting cylinder. The top of the lifting push rod 118 is fixedly connected to the bottom of the push ring 124. Both the outer filter cover 113 and the inner filter cover 114 include an external mounting frame and a mounting frame. The side filter membrane of the filter element; this application uses an inner filter cover 114 and an outer filter cover 113 to intercept and filter rotating materials at the edge position, thereby improving the purity of the materials; at the same time, the lifting push rod 118 drives the inner filter cover 114 to move up and down, changing the relative position of the inner filter cover 114 and the outer filter cover 113, so that the inner filter cover 114 can be used to cooperate with the outer filter cover 113 to achieve dual filtration, or it can be lifted and moved to the outside of the central filter element to assist in the filtration and removal of large particulate impurities in the upper part of the inner cavity of the filter cylinder 101. The state of the inner filter cover 114 after being lifted can be seen in the reference. Figure 5 .

[0023] In one embodiment, see Figure 6 To achieve cleaning of the side filter components, an outer cleaning ring 115 is fixedly connected to the top of the inner wall of the outer filter cover 113. Several outer cleaning ports are opened on the side of the outer cleaning ring 115 near the inner filter cover 114. An inner cleaning ring 116 is fixedly connected to one side of the push ring 124. Several inner cleaning ports are opened on the side of the inner cleaning ring 116 near the outer filter cover 113. Cleaning nozzles are fixedly installed on the inner walls of the several outer cleaning ports and the several inner cleaning ports. Water is sprayed into the inner cleaning cover through the outer cleaning ports on the outer cleaning ring 115, and water is sprayed into the outer cleaning cover through the inner cleaning ports on the inner cleaning ring 116. At the same time, in conjunction with the lifting and lowering action of the inner filter cover 114, a thorough and uniform cleaning operation is achieved for the inner and outer cleaning covers.

[0024] In one embodiment, an inward cleaning plate 117 is fixedly connected to the top of the inner filter cover 114. A gap is provided between the inner wall of the mounting ring 112 and the outer wall of the lower movable plate 109. The size and shape of the inward cleaning plate 117 are consistent with the size and shape of the gap. The top of the inward cleaning plate 117 is set as an inclined surface. An inner spray port is opened on the side of the inward cleaning plate 117 near the central filter element. A diversion spray pipe is fixedly connected inside the inner spray port. Water is sprayed to the central filter element through the diversion spray to achieve cleaning of the overall structure of the central filter element. The outer cleaning ring 115, the inner cleaning ring 116 and the inward cleaning plate 117 are all fixedly connected to cleaning water pipes. Several cleaning water pipes are connected to the output end of an external cleaning water pump.

[0025] In one embodiment, see Figure 2 The centrifugal filter element is used to drive the material inside the filter cylinder 101 to circulate and rotate centrifugally. Its specific structure can be implemented with reference to existing technical means. This embodiment provides a centrifugal drive element structure, which includes a drive motor 119. The output end of the drive motor 119 is fixedly connected to a drive sleeve 120. The outer wall of the drive sleeve 120 is fixedly connected to a number of inclined drive plates 121. The inclination angle of the drive plates 121 is such that they can drive the material to rotate while pushing the material upward. The bottom edge of the lower movable plate 109 is provided with a number of return ports 123 for sending the material into the vicinity of the central filter element, so that it can repeatedly participate in the filtration process.

[0026] In one embodiment, see Figure 7 and Figure 8 The secondary filtration mechanism includes an inlet pressurizing assembly and a filter membrane conversion platform. The inlet pressurizing assembly includes a mounting frame 201, inside which a pressurizing pump 202 is fixedly installed. A docking cylinder 203 is fixedly installed in the middle of the mounting frame 201. The output end of the docking cylinder 203 is fixedly connected to a pressurizing connector 208. Several guide chambers 209 are opened in the middle of the pressurizing connector 208. The pressurizing connector 208 extends into the membrane mounting port 213 to achieve stable contact with the ultrafiltration membrane module 214. In conjunction with the pressurizing pump 202, sufficient filtration pressure is ensured for the material, improving the material permeation efficiency. To ensure that the material is evenly distributed and in contact with the ultrafiltration membrane module 214, and that all parts of the ultrafiltration membrane module 214 are fully utilized and subjected to equal pressure, several guide chambers 209 are opened at the bottom of the pressurizing connector 208. A guide channel 210, the top of which is connected to the bottom of the guide cavity 209; a receiving plate 212 is rotatably connected to the top of the filter membrane conversion platform, and a number of membrane installation ports 213 are opened on the top of the receiving plate 212. Ultrafiltration membrane modules 214 are fixedly installed on the inner wall of the membrane installation ports 213. The specific structure of the ultrafiltration membrane module 214 is implemented using existing technology. A diversion water delivery component is set between the output end of the pressure pump 202 and the pressure connector 208; by setting the receiving plate 212 to rotatably install multiple ultrafiltration membrane modules 214, multiple ultrafiltration membrane modules 214 can be flexibly selected and converted for use, thereby meeting different filtration needs. At the same time, when it is necessary to clean or replace the ultrafiltration membrane module 214, the filtration operation can be carried out without interrupting the operation for a long time.

[0027] In one embodiment, to achieve uniform material delivery to the guide cavity 209, the diversion water delivery assembly includes a diversion ring 204. The top of the diversion ring 204 is fixedly connected to the bottom of the mounting frame 201. A plurality of fixed diversion pipes 206 are fixedly connected to the bottom of the diversion ring 204. Movable diversion pipes 207 are slidably connected to the bottom of each of the fixed diversion pipes 206. The bottom of each of the movable diversion pipes 207 is connected to the guide cavity 209.

[0028] In one embodiment, see Figure 8 and Figure 9 Several membrane mounting ports 213 have compression grooves 218 on their inner wall edges. A compression sealing block 219 is fixedly connected to the edge of the pressure connector 208. The size and shape of the compression sealing block 219 are the same as the size and shape of the compression groove 218. By pressing the compression sealing block 219 against the compression groove 218, the sealing performance between the pressure connector 208 and the membrane mounting port 213 is improved, ensuring that the material can stably pass through the ultrafiltration membrane module 214 under high pressure conditions.

[0029] In one embodiment, see Figure 10 To facilitate the collection and discharge of filtered materials, a base 211 is provided below the filter membrane conversion table. A drainage groove 215 is provided on the top of the base 211 corresponding to one side of the pressure connector 208. A drainage pipe 216 is fixedly connected to one side of the drainage groove 215. A conversion motor 217 is fixedly installed inside the base 211. The output end of the conversion motor 217 is fixedly connected to the bottom of the receiving plate 212.

[0030] In use, the material is fed into the middle of the filter cylinder 101 through the central pipe 102 and flows out through its water outlet 103, penetrating the central filter membrane 107 wrapped around the central pipe 102 to achieve initial encapsulation filtration. The material passing through the central filter membrane 107 flows down through the gap between the mounting ring 112 and the lower movable plate 109. When the material in the filter cylinder 101 reaches a certain amount, the drive motor 119 of the centrifugal drive component is started, driving the drive sleeve 120 and the drive plate 121 to rotate, thereby driving the material to start high-speed rotation. Under the action of centrifugal force, large particles and gel impurities in the material are thrown to the periphery and enriched. At the same time, the material itself forms a strong rotating flow field, which enables it to penetrate radially at multiple angles and uniformly through the central filter membrane 107 and the edge filter assembly composed of the liftable inner filter cover 114 and the fixed outer filter cover 113. Depending on the height of the inner filter hood 114, the material may pass through the dense double-layer interception formed by the inner filter hood 114 and the outer filter hood 113, or be mainly intercepted by the upper inner filter hood 114 to intercept larger suspended particles, thus completing secondary filtration; the clear filtrate that penetrates flows into the collection chamber 110 through the collection tank on the side wall, while the impurities that cannot penetrate and the concentrated slurry settle by centrifugation and gather in the center of the inner cavity of the filter cylinder 101, and are discharged through the slag discharge port and slag discharge pipe at the bottom when needed; The filtrate from the primary filtration is pumped into the secondary filtration unit via the clear liquid pipe 111. The pressure pump 202 delivers it to the rotatable membrane transfer table, where the docking cylinder 203 pushes the pressure connector 208 downwards to align with the membrane mounting port 213 at the current station. This ensures the pressure connector 208 is firmly pressed against the ultrafiltration membrane module 214. The high-pressure filtrate is dispersed through the guide chamber 209 and guide groove 210, and evenly applied to the surface of the ultrafiltration membrane for fine filtration. When the membrane module needs cleaning or reaches saturation, the docking cylinder 203 raises the pressure connector 208, and the transfer motor 217 drives the receiving plate. Rotate 212 to remove the used membrane module and switch a new clean membrane module to the working position. This process does not require long-term interruption of feeding and filtration, thus achieving continuous production. At the same time, the self-cleaning program can be started online in the primary filtration stage. The cleaning water pump sprays cleaning flow onto the inner and outer surfaces of the central filter membrane 107 and the edge filter module through nozzles distributed on the outer cleaning ring 115, inner cleaning ring 116 and inner cleaning plate 117. In conjunction with the lifting push rod 118, the inner filter cover 114 is driven to move up and down, so as to achieve comprehensive cleaning of the filter media and ensure that the equipment is always in a high-efficiency filtration state.

[0031] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A polyurethane anti-yellowing agent filtration and purification device, characterized in that, It includes a primary filtration mechanism and a secondary filtration mechanism; the primary filtration mechanism includes a filter cylinder (101), a central pipe (102) is fixedly connected to the middle of the filter cylinder (101), a water inlet (103) is opened on the outer wall of the central pipe (102), a central filter element is covered on the outer side of the central pipe (102), a collection chamber (110) is opened inside the side wall of the filter cylinder (101), one side of the collection chamber (110) is fixedly connected to the secondary filtration mechanism through a clear liquid pipe (111); an edge filter assembly is provided between the collection chamber (110) and the central filter element, and a centrifugal drive element for driving the material inside the filter cylinder (101) to rotate is provided below the central filter element.

2. The polyurethane anti-yellowing agent filtration and purification equipment as described in claim 1, characterized in that, The central filter element includes a central filter membrane (107). Fixed discs (104) are provided on both the upper and lower sides of the central filter membrane (107). Several fixed rods (105) are fixedly connected between the two fixed discs (104). Each fixed rod (105) is fixedly connected to the inner side of the filter membrane. Both fixed discs (104) are fixedly connected to a central through-tube (102). An upper movable disc (108) and a lower movable disc (109) are rotatably connected to the edges of the two fixed discs (104). Several movable rods (106) are fixedly connected between the upper movable disc (108) and the lower movable disc (109). Each movable rod (106) is fixedly connected to the outer side of the filter membrane. An adjusting element for driving the upper movable disc (108) to rotate is provided on one side of the upper movable disc (108).

3. The polyurethane anti-yellowing agent filtration and purification equipment as described in claim 1, characterized in that, The edge filter assembly includes a mounting ring (112), an outer filter cover (113) is fixedly connected to the inner wall of the mounting ring (112), an inner filter cover (114) is slidably arranged on the inner side of the outer filter cover (113), a push ring (124) is fixedly connected to the bottom of the inner filter cover (114), a lifting cylinder is arranged below the push ring (124), a lifting push rod (118) is fixedly connected to the output end of the lifting cylinder, and the top of the lifting push rod (118) is fixedly connected to the bottom of the push ring (124); a side filter membrane is fixedly installed in the middle of both the outer filter cover (113) and the inner filter cover (114).

4. The polyurethane anti-yellowing agent filtration and purification equipment as described in claim 3, characterized in that, An outer cleaning ring (115) is fixedly connected to the top of the inner wall of the outer filter cover (113). The outer cleaning ring (115) has several outer cleaning ports on the side near the inner filter cover (114). An inner cleaning ring (116) is fixedly connected to one side of the push ring (124). The inner cleaning ring (116) has several inner cleaning ports on the side near the outer filter cover (113). Cleaning nozzles are fixedly installed on the inner walls of the several outer cleaning ports and the several inner cleaning ports.

5. The polyurethane anti-yellowing agent filtration and purification equipment as described in claim 3, characterized in that, An inward cleaning plate (117) is fixedly connected to the top of the inner filter cover (114). The top of the inward cleaning plate (117) is set as an inclined surface. An inner spray nozzle is opened on the side of the inward cleaning plate (117) near the central filter element. A diverter spray pipe is fixedly connected inside the inner spray nozzle.

6. The polyurethane anti-yellowing agent filtration and purification equipment as described in claim 2, characterized in that, The centrifugal drive unit includes a drive motor (119), the output end of the drive motor (119) is fixedly connected to a drive sleeve (120), the outer wall of the drive sleeve (120) is fixedly connected to a number of inclined drive plates (121), and the bottom edge of the lower movable plate (109) is provided with a number of reflux ports (123).

7. The polyurethane anti-yellowing agent filtration and purification equipment as described in claim 1, characterized in that, The secondary filtration mechanism includes an inlet pressurizing component and a filter membrane conversion platform. The inlet pressurizing component includes a mounting frame (201). A pressurizing pump (202) is fixedly installed inside the mounting frame (201). A docking cylinder (203) is fixedly installed in the middle of the mounting frame (201). A pressurizing connector (208) is fixedly connected to the output end of the docking cylinder (203). A receiving plate (212) is rotatably connected to the top of the filter membrane conversion platform. Several membrane installation ports (213) are opened on the top of the receiving plate (212). Ultrafiltration membrane components (214) are fixedly installed on the inner walls of the several membrane installation ports (213). A diversion water delivery component is provided between the output end of the pressurizing pump (202) and the pressurizing connector (208).

8. The polyurethane anti-yellowing agent filtration and purification equipment as described in claim 7, characterized in that, The pressurized connector (208) has several flow guide cavities (209) in the middle and several flow guide grooves (210) at the bottom. The top of each of the flow guide grooves (210) is connected to the bottom of the flow guide cavity (209).

9. The polyurethane anti-yellowing agent filtration and purification equipment as described in claim 8, characterized in that, The diversion water delivery assembly includes a diversion ring (204), the top of which is fixedly connected to the bottom of the mounting bracket (201). The bottom of the diversion ring (204) is fixedly connected to several fixed diversion pipes (206), and the bottom of each of the fixed diversion pipes (206) is slidably connected to a movable diversion pipe (207). The bottom of each of the movable diversion pipes (207) is connected to a flow guide cavity (209).

10. The polyurethane anti-yellowing agent filtration and purification equipment as described in claim 7, characterized in that, A base (211) is provided below the filter membrane conversion table. A drainage groove (215) is provided on the top of the base (211) corresponding to the side of the pressure connector (208). A drainage pipe (216) is fixedly connected to one side of the drainage groove (215). A conversion motor (217) is fixedly installed inside the base (211). The output end of the conversion motor (217) is fixedly connected to the bottom of the receiving plate (212).

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