A multi-stage filtering structure for amino resin processing

Abstract

The application discloses a multi-stage filtering structure for amino resin processing, and belongs to the technical field of amino resin processing, which comprises multi-stage filtering chambers arranged in sequence from top to bottom along the vertical direction, filtering screens obliquely arranged in the filtering chambers and connecting pipes for connecting two adjacent filtering chambers, a scraper is slidably arranged in the filtering chamber, and the scraper is slidably connected to the upper surface of the filtering screen along the oblique direction of the filtering screen; a collecting box for collecting impurities is slidably arranged at the bottom end position of the filtering screen in the filtering chamber; and a first driving mechanism for driving the scraper to move is arranged on the filtering chamber. The application has the effects of reducing the difficulty of cleaning the filtering screen for workers, reducing the working strength of the workers, improving the production efficiency, and reducing the possibility of damage and pollution of the filtering screen.

Description

Technical Field

[0001] This application relates to the field of amino resin processing technology, and in particular to a multi-stage filtration structure for amino resin processing. Background Technology

[0002] Amino resins, as important chemical products, are widely used in coatings, adhesives, and fabric treatment agents. During their post-synthesis processing, they often contain unreacted colloids, catalyst particles, or introduced mechanical impurities. Therefore, multi-stage filtration is essential to improve product purity and quality. Multi-stage filtration systems, by connecting filters of varying precision in series, can remove impurities of different particle sizes step by step, making them crucial equipment for ensuring the quality of amino resins.

[0003] Currently, in existing technologies, multi-stage filtration devices for amino resins typically consist of a basic framework comprising multiple vertically arranged filter chambers connected in series, precision filter screens installed at an angle in each chamber, and a pumping system for conveying the material. The pressure provided by the pumping system drives the resin through each stage of filter screens sequentially. Adjacent filter chambers are connected by connecting pipes to convey the amino resin filtered by the previous stage of filtration; thus completing the filtration process of the amino resin.

[0004] However, when a filter stage becomes clogged due to trapping a large amount of impurities, not only does the filtration efficiency of that stage plummet, but it also increases the flow resistance of the entire system. Currently, the main solution to maintain production is to shut down the machine for disassembly and cleaning. This not only interrupts production but is also time-consuming and labor-intensive, severely impacting production efficiency. Furthermore, the disassembly and reassembly process can easily damage the filter or contaminate the materials. Utility Model Content

[0005] To reduce the difficulty of cleaning the filter screen for workers, thereby reducing their workload and increasing production efficiency, this application also reduces the possibility of filter screen damage and contamination. This application provides a multi-stage filtration structure for amino resin processing.

[0006] This application provides a multi-stage filtration structure for amino resin processing, which adopts the following technical solution: A multi-stage filtration structure for processing amino resins includes multiple filtration chambers arranged vertically from top to bottom, a filter screen inclinedly disposed within each filtration chamber, and a connecting pipe for connecting two adjacent filtration chambers. A scraper is slidably disposed within each filtration chamber and is connected to the upper surface of the filter screen along the inclined direction of the filter screen. A collection box for collecting impurities is slidably disposed within the filtration chamber at the bottom end of the filter screen. A first driving mechanism for driving the scraper to move is provided on each filtration chamber.

[0007] By adopting the above technical solution, the amino resin flows sequentially through each stage of inclined filter screens under gravity, and impurities are trapped. As more and more impurities accumulate on the filter screens, causing them to gradually become clogged, the pressure inside the filter chamber gradually increases. When the pressure inside the filter chamber reaches its maximum value, the first drive mechanism is triggered. The first drive mechanism drives a scraper to move along the upper surface of the inclined filter screen, scraping the accumulated impurities into the collection box at the bottom. The filter screens can be cleaned without stopping the machine, ensuring the continuity and automation of production. It also reduces the difficulty of cleaning the filter screens for workers, thereby reducing the workload of workers, improving production efficiency, and reducing the possibility of damage and contamination to the filter screens.

[0008] Preferably, the first driving mechanism includes a lead screw, a rack, and a spur gear. The lead screw is rotatably mounted on the side wall of the filter chamber, and the scraper is threadedly engaged with the lead screw. One end of the lead screw extends to the outside of the filter chamber. A sealing tube is connected to the side wall of the filter chamber, and a piston plate is disposed inside the sealing tube. The piston plate slides along the axial direction of the sealing tube and is connected to the inner wall of the sealing tube. One end of the rack is fixedly mounted on the piston plate, and the rack slides outside the filter chamber along the moving direction of the piston plate. A rotating rod is rotatably mounted on the outer wall of the filter chamber, and the spur gear is fixedly mounted on the rotating rod, meshing with the rack. A bevel gear is fixedly mounted on the rotating rod, and one end of the lead screw extends to the outside of the filter chamber and is fixedly mounted on a bevel gear, meshing with the bevel gear. A limiting block is slidably disposed on the inner wall of the filter chamber near the piston plate. A connecting block is fixedly disposed on the piston plate. The connecting block has a limiting groove for the limiting block to be inserted into. One side of the limiting block has an inclined surface, and the limiting block slides and engages with the connecting block through its inclined surface. A moving component for driving the limiting block away from the connecting block is provided in the filter chamber. The first driving mechanism also includes a reset component for resetting the piston plate.

[0009] By adopting the above technical solution, when the filter screen becomes clogged and the pressure in the chamber gradually rises to the maximum value, the moving component is triggered. The moving component drives the limiting block away from the connecting block, releasing the limiting block from restricting the piston plate. At this time, the pressure in the chamber can push the piston plate in the sealing tube to move. The piston plate drives the first spur gear and the rotating rod to rotate through the rack fixed on it. The rotating rod drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the lead screw to rotate, and the lead screw drives the scraper to move to perform cleaning. After cleaning, the reset component 1 resets the piston plate to the initial position. The piston plate drives the connecting block to move. The connecting block can push the limiting block to move through the inclined surface on the limiting block. When the limiting block corresponds to the limiting groove on the connecting block, the moving component pushes the limiting block to insert into the connecting groove, thereby restricting the piston plate again. The entire cleaning process uses the pressure in the chamber as the power source to drive the scraper to move, reducing the difficulty of scraper movement.

[0010] Preferably, the reset component is a spring, a support rod is fixedly provided on the outer side wall of the filter chamber, the spring is horizontally arranged along the moving direction of the piston plate, and the two ends of the spring are respectively fixedly provided on the support rod and the rack.

[0011] By adopting the above technical solution, when the pressure inside the filter chamber rises, causing the piston plate to move outward, spring one is compressed; subsequently, after cleaning is completed, the pressure inside the filter chamber drops, and the elastic force of spring one pushes rack one and piston plate back to their initial positions, preparing for the next pressure trigger. This ensures that the overall cleaning action can be performed cyclically.

[0012] Preferably, a guide rod is fixedly provided on the side wall of the rack, the guide rod is horizontally inserted along the moving direction of the piston plate and slides on the side wall of the support rod; the spring is sleeved on the guide rod.

[0013] By adopting the above technical solution, the guide rod ensures that the rack and the piston plate move in a straight line, thereby improving the guiding accuracy and stability of the piston plate movement.

[0014] Preferably, the moving component includes a pressure sensor, an electromagnet, a magnetic block, and a controller. The pressure sensor, the electromagnet, and the controller are all installed in the filter chamber. The signal receiving end of the controller is connected to the signal output end of the pressure sensor to receive the pressure sensing signal. The control end of the controller is connected to the signal input end of the electromagnet to control the opening and closing of the electromagnet in response to the pressure sensing signal. The magnetic block is installed on the limiting block and can be attracted to the electromagnet. The moving component also includes a second reset element for resetting the limiting block.

[0015] By adopting the above technical solution, the pressure sensor monitors the chamber pressure in real time. When the pressure reaches the preset safety threshold, the controller turns on the electromagnet power supply. The electromagnet can attract the magnetic block, which drives the limit block to disengage from the connecting block, releasing the lock on the piston plate, thereby reducing the difficulty of moving the limit block. When the pressure in the chamber gradually returns to the normal state, the controller disconnects the electromagnet power supply. The reset component 2 can reset the limit block to the initial state, making it easy for the limit block to limit the piston plate again, so that the overall cleaning process can be repeated.

[0016] Preferably, the second reset element is a second spring, which is arranged along the moving direction of the limiting block, and the two ends of the second spring respectively abut against the limiting block and the inner wall of the filter chamber.

[0017] By adopting the above technical solution, when the limiting block is far away from the piston plate and the connecting block, the second spring is compressed. When the pressure in the chamber gradually decreases to the normal state, the electromagnet is de-energized. At this time, the elastic force of the second spring pushes the limiting block closer to the connecting block, so that the limiting block is reset, making it easy for the limiting block to be inserted into the limiting groove on the connecting block again; thus, the entire cleaning process can be repeated.

[0018] Preferably, a sealing plate is slidably provided inside the connecting pipe, and a second driving mechanism for driving the sealing plate to move is provided outside the next-level filter chamber connected to the connecting pipe.

[0019] By adopting the above technical solution, when the filter screen in a certain filter chamber is blocked, causing the pressure in the chamber to increase to a preset safety threshold, the second driving mechanism is triggered. The second driving mechanism drives the sealing plate in the connecting pipe connected to the previous filter chamber to move, so that the sealing plate gradually closes the corresponding connecting pipe, thereby reducing the amount of amino resin that continues to fall into the blocked filter chamber, and thus reducing the possibility of the pressure in the filter chamber continuing to increase.

[0020] Preferably, the second driving mechanism includes a second rack, a third rack, a second spur gear, and a driving rod. The second rack is fixedly mounted on the first rack, and the second spur gear is rotatably mounted on the side wall of the support rod. Both the second rack and the third rack mesh with the second spur gear. Both the second rack and the third rack are slidably mounted outside the filter chamber along the moving direction of the piston plate, and the moving directions of the second rack and the third rack are opposite. One end of the driving rod is fixedly mounted on the sealing plate, and the other end of the driving rod is fixedly mounted on the third rack. The support rod is provided with a reset member three for resetting the sealing plate.

[0021] By adopting the above technical solution, when the piston plate moves due to pressure, the rack two fixed on the rack one moves accordingly, driving the spur gear two to rotate, which in turn drives the rack three and the drive rod to move in opposite directions. The drive rod drives the sealing plate to gradually close the inner cavity of the connecting pipe. When the pressure in the cavity gradually returns to normal, the reset component three resets the sealing plate to its initial state, and the inner cavity of the connecting pipe gradually opens. The whole process reduces the difficulty of moving the sealing plate, allowing the sealing plate to move according to the pressure changes in the cavity, so as to control the flow area in the connecting pipe.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Under the influence of gravity, amino resin flows sequentially through various inclined filter screens, where impurities are trapped. As more and more impurities accumulate on the filter screens, causing them to become gradually clogged, the pressure inside the filter chamber gradually increases. When the pressure inside the filter chamber reaches its maximum value, the first drive mechanism is triggered. The first drive mechanism drives a scraper to move along the upper surface of the inclined filter screen, scraping the accumulated impurities into the collection box at the bottom. The filter screens can be cleaned without stopping the machine, ensuring continuous production and automation. It also reduces the difficulty of cleaning the filter screens for workers, thereby reducing their workload, improving production efficiency, and reducing the possibility of damage and contamination to the filter screens. 2. When the filter becomes clogged, causing the pressure inside the chamber to gradually rise to its maximum value, the moving component is triggered. The moving component drives the limiting block away from the connecting block, releasing the limiting block from restricting the piston plate. At this time, the pressure inside the chamber can push the piston plate inside the sealing tube to move. The piston plate drives the first spur gear and the rotating rod to rotate through the rack fixed on it. The rotating rod drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the lead screw to rotate, and the lead screw drives the scraper to move to perform cleaning. After cleaning, the reset component 1 resets the piston plate to its initial position. The piston plate drives the connecting block to move. The connecting block can push the limiting block to move through the inclined surface on the limiting block. When the limiting block corresponds to the limiting groove on the connecting block, the moving component pushes the limiting block to insert into the connecting groove, thereby restricting the piston plate again. The entire cleaning process uses the pressure inside the chamber as the power source to drive the scraper to move, reducing the difficulty of scraper movement. 3. When the piston plate moves due to pressure, the rack two fixed on the rack one moves accordingly, driving the spur gear two to rotate, which in turn drives the rack three and the drive rod to move in opposite directions. The drive rod drives the sealing plate to gradually close the inner cavity of the connecting pipe. When the pressure in the cavity gradually returns to normal, the reset component three resets the sealing plate to its initial state, and the inner cavity of the connecting pipe gradually opens. The whole process reduces the difficulty of moving the sealing plate, allowing the sealing plate to move according to the pressure changes in the cavity, so as to control the flow area in the connecting pipe. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the lead screw structure in the embodiments of this application; Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0024] Explanation of reference numerals in the attached figures: 1. Filter chamber; 2. Filter screen; 3. Connecting pipe; 4. Scraper; 5. Collection box; 6. First drive mechanism; 7. Lead screw; 8. Rack 1; 9. Spur gear 1; 10. Sealing pipe; 11. Piston plate; 12. Connecting rod; 13. Rotating rod; 14. Bevel gear 1; 15. Bevel gear 2; 16. Limiting block; 17. Connecting block; 18. Moving component; 181. Pressure sensor; 182. Electromagnet; 183. Magnetic block; 184. Controller; 185. Spring 2; 186. Guide rod 2; 187. Guide block; 19. Spring 1; 20. Support rod; 21. Guide rod 1; 22. Sealing plate; 23. Second drive mechanism; 231. Rack 2; 232. Rack 3; 233. Spur gear 2; 234. Drive rod; 235. Slide rod; 236. Guide rod 3; 237. Spring 3. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0026] This application discloses a multi-stage filtration structure for amino resin processing, such as... Figure 1 and Figure 2 As shown, the system includes a multi-stage filtration chamber 1 arranged vertically from top to bottom, a filter screen 2 inclinedly disposed within the filtration chamber 1, and a connecting pipe 3 for connecting two adjacent filtration chambers 1. A scraper 4 is slidably disposed within the filtration chamber 1, and the scraper 4 is slidably connected to the upper surface of the filter screen 2 along the inclined direction of the filter screen 2. A collection box 5 for collecting impurities is horizontally slidably disposed at the bottom end of the filter screen 2 within the filtration chamber 1. A handle for easy pulling by the operator is provided on the outer wall of the collection box 5, and the opening of the collection box 5 faces upward. A first drive mechanism 6 for driving the scraper 4 to move is provided on the filtration chamber 1.

[0027] like Figure 1 and Figure 2As shown, the amino resin flows sequentially through the inclined filter screens 2 under gravity, trapping impurities. As more and more impurities accumulate on the filter screens 2, causing them to become gradually clogged, the pressure inside the filter chamber 1 gradually increases. When the pressure inside the filter chamber 1 reaches its maximum value, the first drive mechanism 6 is triggered. The first drive mechanism 6 drives the scraper 4 to move along the upper surface of the inclined filter screen, scraping the accumulated impurities into the collection box 5 at the bottom. The filter screens 2 can be cleaned without stopping the machine, ensuring the continuity and automation of production. It also reduces the difficulty of cleaning the filter screens 2 for workers, thereby reducing their workload, improving production efficiency, and reducing the possibility of damage and contamination to the filter screens 2.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, the first drive mechanism 6 includes a lead screw 7, a rack 8, and a spur gear 9. The lead screw 7 is arranged along the inclined direction of the filter screen 2, and the lead screw 7 is sealed to one side wall of the filter chamber 1 by a bearing. The lead screw 7 passes through and is threadedly connected to the side wall of the scraper 4, and the top end of the lead screw 7 extends to the outside of the filter chamber 1. A sealing tube 10 is connected to the side wall of the filter chamber 1. The sealing tube 10 is arranged horizontally along the width direction of the filter chamber 1. A piston plate 11 is arranged inside the sealing tube 10. The piston plate 11 slides along the axial direction of the sealing tube 10 and is connected to the inner side of the sealing tube 10. The filter chamber 1 has a wall; a rack 8 is arranged axially along the sealing tube 10, one end of which is fixedly connected to the piston plate 11, and the rack 8 slides outside the filter chamber 1 along the moving direction of the piston plate 11; a connecting rod 12 is fixedly connected to the outer wall of the filter chamber 1, and a rotating rod 13 is rotatably connected to the connecting rod 12; a spur gear 9 is sleeved and fixed on the rotating rod 13, and the spur gear 9 meshes with the rack 8; a bevel gear 14 is sleeved and fixed on the rotating rod 13, and a bevel gear 2 15 is sleeved and fixed at the top of the lead screw 7, and the bevel gear 2 15 meshes with the bevel gear 14.

[0029] like Figure 2 and Figure 3 As shown, a limiting block 16 is vertically slidably disposed on the inner wall of the filter chamber 1 near the piston plate 11. The limiting block 16 is located above the piston plate 11. A connecting block 17 is fixedly connected to the side of the piston plate 11 inside the filter chamber 1. A limiting groove is provided on the connecting block 17 for the limiting block 16 to be inserted. An inclined surface is provided on the bottom end of the limiting block 16 near the piston plate 11. The limiting block 16 is slidably connected to the side wall of the connecting block 17 through its inclined surface. A moving assembly 18 is provided inside the filter chamber 1 for driving the limiting block 16 away from the connecting block 17. The first driving mechanism 6 also includes a reset member for resetting the piston plate 11.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, when the filter becomes clogged, causing the pressure inside the chamber to gradually rise to its maximum value, the moving component 18 is triggered. The moving component 18 drives the limiting block 16 away from the connecting block 17, releasing the limiting block 16 from restricting the piston plate 11. At this time, the pressure inside the chamber can push the piston plate 11 inside the sealing tube 10 to move. The piston plate 11 drives the spur gear 9 and the rotating rod 13 to rotate through the rack 8 fixed on it. The rotating rod 13 drives the bevel gear 14 to rotate. The bevel gear 14 drives the bevel gear 15 to rotate. The bevel gear 15 drives the lead screw 7 to rotate. The lever 7 drives the scraper 4 to move and perform cleaning. After cleaning, the reset component 1 resets the piston plate 11 to the initial position. The piston plate 11 drives the connecting block 17 to move. The connecting block 17 can push the limiting block 16 to move through the inclined surface on the limiting block 16. When the limiting block 16 corresponds to the limiting groove on the connecting block 17, the moving component 18 pushes the limiting block 16 to insert into the connecting groove, so that the piston plate 11 can be limited again. The entire cleaning process is driven by the pressure in the chamber as the power source to move the scraper 4, which reduces the difficulty of moving the scraper 4.

[0031] like Figure 2 and Figure 3 As shown, the reset component is spring 19. A support rod 20 is fixedly installed on the outer wall of the filter chamber 1. Spring 19 is horizontally arranged along the moving direction of piston plate 11, and both ends of spring 19 are fixedly installed on support rod 20 and rack 8, respectively. A guide rod 21 is fixedly connected to the end of rack 8 away from piston plate 11. Guide rod 21 is horizontally arranged along the axial direction of sealing tube 10. Guide rod 21 passes horizontally through and slides on the side wall of support rod 20 along the moving direction of piston plate 11. Spring 19 is sleeved on guide rod 21.

[0032] like Figure 2 and Figure 3 As shown, when the pressure inside the filter chamber 1 rises, causing the piston plate 11 to move outward, the spring 19 is compressed. Subsequently, after cleaning is completed, the pressure inside the filter chamber 1 drops, and the elastic force of the spring 19 pushes the rack 8 and the piston plate 11 back to their initial positions, preparing for the next pressure trigger. This ensures that the overall cleaning action can be performed cyclically. The guide rod 21 ensures that the rack 8 and the piston plate 11 move in a straight line, improving the guiding accuracy and stability of the piston plate 11's movement.

[0033] like Figure 2 and Figure 3As shown, the moving component 18 includes a pressure sensor 181, an electromagnet 182, a magnetic block 183, and a controller 184. The pressure sensor 181, electromagnet 182, and controller 184 are all installed in the filter chamber 1. The signal receiving end of the controller 184 is connected to the signal output end of the pressure sensor 181 to receive the pressure sensing signal. The control end of the controller 184 is connected to the signal input end of the electromagnet 182 to control the opening and closing of the electromagnet 182 in response to the pressure sensing signal. The magnetic block 183 is installed on the limiting block 16 and can be attracted to the electromagnet 182.

[0034] like Figure 2 and Figure 3 As shown, the moving assembly 18 also includes a reset component 2 for resetting the limiting block 16. The reset component 2 is a spring 2 185, which is vertically arranged along the moving direction of the limiting block 16. A guide rod 2 186 is fixedly connected to the side wall of the limiting block 16. The guide rod 2 186 is vertical, and the spring 2 185 is sleeved on the guide rod 2 186. A guide block 187 is fixedly connected to the inner wall of the filter chamber 1. The guide rod 2 186 passes through and slides vertically to the side wall of the guide block 187. The two ends of the spring 2 185 abut against the side wall of the limiting block 16 and the guide block 187, respectively.

[0035] like Figure 2 and Figure 3 As shown, the pressure sensor 181 monitors the chamber pressure in real time. When the pressure reaches a preset safety threshold, the controller 184 turns on the power to the electromagnet 182. The electromagnet 182 can attract the magnetic block 183. The magnetic block 183 drives the limiting block 16 to disengage from the connecting block 17, releasing the lock on the piston plate 11. The second spring 185 is compressed, thereby reducing the difficulty of moving the limiting block 16. When the pressure in the chamber gradually returns to normal, the controller 184 turns off the power to the electromagnet 182. At this time, the elastic force of the second spring 185 pushes the limiting block 16 closer to the connecting block 17, so that the limiting block 16 resets, making it easier for the limiting block 16 to limit the piston plate 11 again, so that the overall cleaning process can be repeated.

[0036] like Figure 1 and Figure 2 As shown, a sealing plate 22 is horizontally slidably installed inside the connecting pipe 3, and a second driving mechanism 23 for driving the sealing plate 22 to move is provided outside the next-stage filter chamber 1 connected to the connecting pipe 3.

[0037] like Figure 1 and Figure 2As shown, when the filter screen 2 in a certain filter chamber 1 is blocked, causing the pressure in the chamber to increase to a preset safety threshold, the second drive mechanism 23 is triggered. The second drive mechanism 23 drives the sealing plate 22 in the connecting pipe 3 connected to the previous filter chamber 1 to move, so that the sealing plate 22 gradually closes the corresponding connecting pipe 3, thereby reducing the amount of amino resin that continues to fall into the blocked filter chamber 1, and thus reducing the possibility of the pressure in the filter chamber 1 continuing to increase.

[0038] like Figure 2 and Figure 3 As shown, the second drive mechanism 23 includes rack 231, rack 32, spur gear 233, and drive rod 234. Rack 231 and rack 32 are both horizontally arranged along the axial direction of the sealing tube 10. Rack 231 is fixedly connected to the top of rack 8. Spur gear 233 is rotatably arranged on the side wall of support rod 20. Rack 32 and rack 231 are located on the upper and lower sides of spur gear 233, respectively. Rack 231 and rack 32 mesh with spur gear 233. Rack 231 and rack 32 are both slidably arranged outside the filter chamber 1 along the moving direction of piston plate 11. The moving directions of rack 231 and rack 32 are opposite.

[0039] like Figure 2 and Figure 3 As shown, one end of the drive rod 234 is fixedly connected to the sealing plate 22, and the other end of the drive rod 234 is fixedly connected to the slide rod 235. The slide rod 235 is vertically arranged and slides horizontally along the moving direction of the piston plate 11 to the side wall of the support rod 20. The bottom end of the slide rod 235 is fixedly connected to the top of the rack 232. A guide rod 236 is fixedly connected to the side of the slide rod 235 away from the filter chamber 1. The guide rod 236 is horizontally arranged and slides horizontally along the moving direction of the piston plate 11 to the side wall of the support rod 20. The support rod 20 is provided with a reset member 3 that resets the sealing plate 22. The reset member 3 is a spring 237. The spring 237 is horizontally arranged and sleeved on the guide rod 236. The two ends of the spring 237 are fixedly connected to the inner wall of one side of the support rod 20 and the side wall of the slide rod 235, respectively.

[0040] like Figure 2 and Figure 3As shown, when the piston plate 11 moves due to pressure, the rack 231 fixed on the rack 8 moves accordingly, driving the spur gear 233 to rotate, which in turn drives the rack 32 and the drive rod 234 to move in opposite directions. The drive rod 234 drives the sealing plate 22 to gradually close the inner cavity of the connecting pipe 3. The spring 337 is stretched. When the pressure in the cavity gradually returns to normal, the elastic force of the spring 337 pulls the sealing plate 22, causing the sealing plate 22 to return to its initial state, and the inner cavity of the connecting pipe 3 gradually opens. The whole process reduces the difficulty of moving the sealing plate 22, so that the sealing plate 22 can move according to the pressure changes in the cavity to control the flow area in the connecting pipe 3.

[0041] The implementation principle of this application embodiment is as follows: under the action of gravity, the amino resin flows through the inclined filter screens 2 of each stage in sequence, and impurities are intercepted; when more and more impurities accumulate on the filter screens 2, causing the filter screens 2 to gradually become clogged, the pressure in the filter chamber 1 gradually increases. When the pressure in the filter chamber 1 increases to the maximum value, the first drive mechanism 6 is triggered. The first drive mechanism 6 drives the scraper 4 to move along the upper surface of the inclined filter screen, scraping the accumulated impurities into the collection box 5 at the bottom; the filter screens 2 can be cleaned without stopping the machine; this ensures the continuity of production and the degree of automation; it reduces the difficulty for workers to clean the filter screens 2, thereby reducing the workload of workers, improving production efficiency, and also reducing the possibility of damage and contamination to the filter screens 2.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-stage filtration structure for processing amino resins, comprising a multi-stage filtration chamber (1) arranged vertically from top to bottom, a filter screen (2) inclinedly disposed within the filtration chamber (1), and a connecting pipe (3) for connecting two adjacent filtration chambers (1), characterized in that: A scraper (4) is slidably disposed in the filter chamber (1), and the scraper (4) is slidably connected to the upper surface of the filter screen (2) along the inclined direction of the filter screen (2); a collection box (5) for collecting impurities is slidably disposed in the filter chamber (1) at the bottom end of the filter screen (2); a first driving mechanism (6) for driving the scraper (4) to move is provided on the filter chamber (1).

2. The multi-stage filtration structure for amino resin processing according to claim 1, characterized in that: The first driving mechanism (6) includes a lead screw (7), a rack (8), and a spur gear (9). The lead screw (7) is rotatably mounted on the side wall of the filter chamber (1), and the scraper (4) is threadedly engaged with the lead screw (7). One end of the lead screw (7) extends to the outside of the filter chamber (1). A sealing tube (10) is connected to the side wall of the filter chamber (1). A piston plate (11) is provided inside the sealing tube (10). The piston plate (11) slides along the axial direction of the sealing tube (10) and is connected to the inner wall of the sealing tube (10). One end of the rack (8) is fixedly mounted on the side wall of the filter chamber (1). The piston plate (11) is described above, and the rack (8) slides outside the filter chamber (1) along the moving direction of the piston plate (11); a rotating rod (13) is rotatably arranged on the outer wall of the filter chamber (1), and a spur gear (9) is fixedly arranged on the rotating rod (13), and the spur gear (9) meshes with the rack (8); a bevel gear (14) is fixedly arranged on the rotating rod (13), and one end of the lead screw (7) extends to the outside of the filter chamber (1) and a bevel gear (15) is fixedly arranged thereon, and the bevel gear (15) meshes with the bevel gear (14); A limiting block (16) is slidably disposed on the inner wall of the filter chamber (1) near the piston plate (11). A connecting block (17) is fixedly disposed on the piston plate (11). A limiting groove is provided on the connecting block (17) for the limiting block (16) to be inserted. A slope is provided on one side of the limiting block (16). The limiting block (16) slides and engages with the connecting block (17) through its slope. A moving component (18) is provided in the filter chamber (1) for driving the limiting block (16) away from the connecting block (17). The first driving mechanism (6) also includes a reset component for resetting the piston plate (11).

3. The multi-stage filtration structure for amino resin processing according to claim 2, characterized in that: The reset component is a spring (19). A support rod (20) is fixedly installed on the outer wall of the filter chamber (1). The spring (19) is horizontally installed along the moving direction of the piston plate (11), and the two ends of the spring (19) are respectively fixedly installed on the support rod (20) and the rack (8).

4. A multi-stage filtration structure for amino resin processing according to claim 3, characterized in that: A guide rod (21) is fixedly provided on the side wall of the rack (8). The guide rod (21) passes horizontally through the piston plate (11) and slides on the side wall of the support rod (20). The spring (19) is sleeved on the guide rod (21).

5. A multi-stage filtration structure for amino resin processing according to claim 2, characterized in that: The moving component (18) includes a pressure sensor (181), an electromagnet (182), a magnetic block (183), and a controller (184). The pressure sensor (181), the electromagnet (182), and the controller (184) are all installed in the filter chamber (1). The signal receiving end of the controller (184) is connected to the signal output end of the pressure sensor (181) to receive the pressure sensing signal. The control end of the controller (184) is connected to the signal input end of the electromagnet (182) to control the opening and closing of the electromagnet (182) in response to the pressure sensing signal. The magnetic block (183) is installed on the limiting block (16) and can be attracted to the electromagnet (182). The moving component (18) also includes a reset component II for resetting the limiting block (16).

6. A multi-stage filtration structure for amino resin processing according to claim 5, characterized in that: The second reset component is a second spring (185), which is arranged along the moving direction of the limiting block (16), and the two ends of the second spring (185) are respectively abutted against the inner wall of the limiting block (16) and the filter chamber (1).

7. A multi-stage filtration structure for amino resin processing according to claim 3, characterized in that: A sealing plate (22) is slidably provided inside the connecting pipe (3), and a second driving mechanism (23) for driving the sealing plate (22) to move is provided outside the next-level filter chamber (1) connected to the connecting pipe (3).

8. A multi-stage filtration structure for amino resin processing according to claim 7, characterized in that: The second drive mechanism (23) includes a second rack (231), a third rack (232), a second spur gear (233), and a drive rod (234). The second rack (231) is fixedly mounted on the first rack (8), and the second spur gear (233) is rotatably mounted on the side wall of the support rod (20). Both the second rack (231) and the third rack (232) mesh with the second spur gear (233). The second rack (231) and the third rack (232) mesh with the second spur gear (233). All three racks (232) are slidably disposed outside the filter chamber (1) along the moving direction of the piston plate (11), and the moving direction of the second rack (231) is opposite to that of the third rack (232); one end of the drive rod (234) is fixedly disposed on the sealing plate (22), and the other end of the drive rod (234) is fixedly disposed on the third rack (232); the support rod (20) is provided with a reset member three for resetting the sealing plate (22).

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