Chemical industrial wastewater filtering structure with pre-crystallization pretreatment

Abstract

This invention relates to the field of water pollution control technology, specifically a pre-crystallization pretreatment chemical wastewater filtration structure, including a treatment tank, a filter cartridge, and filter screens. The filter cartridge is located inside the treatment tank, dividing the inner cavity of the treatment tank into a crystallization settling zone and a clear water discharge zone. A crystallization induction frame is provided in the crystallization settling zone. Two filter screens are provided, which are sequentially inserted into the filter cartridge along the axial direction. The treatment tank is equipped with two sets of self-cleaning mechanisms, which are respectively connected to the two filter screens. The treatment tank is also equipped with an alternating drive mechanism, which is driven and cooperates with the two sets of self-cleaning mechanisms. This invention utilizes the linkage between the alternating drive mechanism and the two sets of self-cleaning mechanisms to switch between two states: alternating removal for cleaning and continuous filtration. This ensures that the system can maintain complete filtration function during filter screen maintenance, achieving continuous operation without interrupting the treatment process.

Description

Technical Field

[0001] This invention relates to the field of water pollution control technology, specifically a chemical wastewater filtration structure for pre-crystallization pretreatment. Background Technology

[0002] Wastewater generated during chemical production processes typically contains high concentrations of hardness ions, phosphates, and other scale-forming substances. If this wastewater directly enters advanced treatment units such as membrane separation or evaporation concentration, it easily forms a dense scale layer on the surface of the treatment equipment, causing problems such as flux reduction, increased energy consumption, and frequent downtime for maintenance. Therefore, setting up a pretreatment stage before advanced treatment to remove scale-forming components from the wastewater is crucial to ensuring the stable operation of subsequent systems.

[0003] Induced crystallization (ICC) technology, as a method for selectively removing specific ions, involves adding seed carriers to wastewater to provide nucleation sites for supersaturated hardness ions and phosphates, allowing them to grow into large-diameter crystals on the carrier surface, thus transforming pollutants from the liquid phase to the solid phase. This technology offers advantages such as easy product separation, controllable reagent dosage, and resource recovery potential, and has attracted widespread attention in the fields of wastewater softening and nutrient removal.

[0004] However, in existing wastewater treatment devices that employ induced crystallization, the crystallization zone and filtration zone are often designed as separate units. The crystal products need to be transferred to the filtration unit for solid-liquid separation via additional conveying equipment, resulting in a long process and a large footprint. Furthermore, the filtration unit is prone to clogging during crystal retention, requiring periodic shutdowns for manual or mechanical cleaning, which interrupts the treatment process and fails to meet the demands for continuous and stable treatment of chemical wastewater.

[0005] In addition, although some devices integrate crystallization and filtration in the same reactor, the filter screen lacks effective online cleaning methods after intercepting the crystallized products. The co-deposition of crystal particles and organic matter easily forms a caking layer on the filter screen surface. Conventional backwashing is difficult to restore the filter screen flux. After long-term operation, the filtration resistance continues to rise, and the system's processing capacity decreases significantly.

[0006] Another technology uses a single set of filters in conjunction with shutdown cleaning. During filter maintenance, the influent or wastewater must be interrupted or bypassed, resulting in reduced treatment efficiency or fluctuations in effluent quality. This cannot meet the stringent requirements of continuous wastewater treatment in chemical production. Summary of the Invention

[0007] The purpose of this invention is to provide a pre-crystallization pretreatment filtration structure for chemical wastewater to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A pre-crystallization pretreatment chemical wastewater filtration structure includes a treatment tank, a filter cartridge, and a filter screen. The filter cartridge is disposed inside the treatment tank, dividing the inner cavity of the treatment tank into a crystallization settling zone and a clear water discharge zone. A crystallization induction frame is disposed in the crystallization settling zone, and the crystallization induction frame is filled with a seed crystal carrier and a flocculant. The filter screen is configured as two screens, which are sequentially inserted into the filter cartridge along the axial direction of the filter cartridge to perform two-stage filtration of the wastewater passing through the filter cartridge; The processing box is equipped with two sets of self-cleaning mechanisms, which are respectively connected to two filters. When any one of the self-cleaning mechanisms is running, it can move the filter connected to it out of the filter cylinder and perform high-pressure washing on the surface of the filter. The processing box is also equipped with an alternating drive mechanism, which is in transmission cooperation with two sets of self-cleaning mechanisms respectively; when the alternating drive mechanism is running, the two sets of self-cleaning mechanisms operate alternately to ensure that at least one set of filter screens is always in the filtration position inside the filter cartridge.

[0009] The pre-crystallization pretreatment chemical wastewater filtration structure described above: The self-cleaning mechanism includes an L-shaped guide rail and a movable plate. The L-shaped guide rail is installed inside the processing box, and the movable plate is horizontally slidably disposed inside the processing box. The top of the filter cartridge is provided with a slot, and the filter screen is vertically inserted into the filter cartridge through the slot.

[0010] The pre-crystallization pretreatment chemical wastewater filtration structure described above: A rectangular block is provided at the top of the filter screen, and the rectangular block is slidably disposed within the L-shaped guide rail; The movable plate has an inclined groove, and the top of the filter screen is provided with a sliding rod, which slides into the inclined groove. When the moving plate moves horizontally, the inclined groove, the sliding rod, the rectangular block, and the L-shaped guide rail work together to make the filter screen first move vertically out of the filter cylinder and then slide horizontally.

[0011] The pre-crystallization pretreatment chemical wastewater filtration structure described above: The self-cleaning mechanism also includes a drive shaft and a sleeve, with the drive shaft horizontally rotatably mounted on the processing box; The length direction of the drive shaft is the same as the movement direction of the moving plate, and the sleeve is slidably sleeved on the outer wall of the drive shaft and connected to the moving plate.

[0012] The pre-crystallization pretreatment chemical wastewater filtration structure described above: The outer wall of the drive shaft is provided with an annular track groove along its length direction, and a ball is rolled and fitted into the inner wall of the sleeve, and the ball is also rolled and fitted into the annular track groove. The processing tank has a vertically installed water pipe connected to a water pump. Multiple high-pressure nozzles are arranged vertically and evenly on one side of the water pipe. The filter screen will pass through multiple high-pressure nozzles during the translation process.

[0013] The pre-crystallization pretreatment chemical wastewater filtration structure described above: The alternating drive mechanism includes a rotating rod, a rotating shaft, and a sliding plate, wherein the rotating rod and the rotating shaft are both horizontally rotatably mounted on the processing box; The slide plate is provided with a sleeve and a collar respectively. The sleeve is slidably fitted on the outer wall of the rotating rod, and the collar is slidably fitted on the outer wall of the rotating shaft.

[0014] The pre-crystallization pretreatment chemical wastewater filtration structure described above: The outer wall of the rotating rod is provided with a spiral groove and a straight groove along its length, and the spiral groove and the straight groove are interconnected. The inner wall of the sleeve is fitted with rolling balls, which are also fitted into the spiral groove.

[0015] The pre-crystallization pretreatment chemical wastewater filtration structure described above: The outer wall of the rotating shaft is provided with a shaft groove and a threaded groove in sequence along its length direction, and the shaft groove and the threaded groove are interconnected. The inner wall of the collar is fitted with rolling steel balls, which are also fitted into the shaft groove. During the translation of the slide plate, when the ball slides from the spiral groove into the straight groove, the steel ball slides from the shaft groove into the threaded groove.

[0016] The pre-crystallization pretreatment chemical wastewater filtration structure described above: The alternating drive mechanism further includes a disc, a carriage, and a connecting rod. The disc is horizontally rotatable on the processing box, and the carriage is horizontally slidable on the processing box with one end connected to the sliding plate. An eccentric column is provided on the disc, and the two ends of the connecting rod are respectively rotatably connected to the other end of the carriage and the eccentric column.

[0017] The pre-crystallization pretreatment chemical wastewater filtration structure described above: The processing box is equipped with a geared motor, and the output end of the geared motor is coaxially connected to the disc; Small pulleys are coaxially arranged on the rotating rod and the rotating shaft, and large pulleys are coaxially arranged on both driving shafts. The small pulleys and large pulleys are connected by a toothed belt.

[0018] Compared with the prior art, the beneficial effects of the present invention are: By combining pre-crystallization induction with two-stage filtration, hardness ions and phosphates in wastewater are selectively crystallized and grown on the surface of the seed carrier. After forming large-diameter crystals, they are sequentially intercepted by the two-stage filter screens, achieving efficient separation of crystallization products from the liquid phase and reducing the risk of scaling in subsequent treatment units. By utilizing the linkage between the alternating drive mechanism and two sets of self-cleaning mechanisms, the two filters switch between alternating removal for cleaning and continuous filtration, ensuring that the system can maintain complete filtration function during filter maintenance and achieve continuous operation without interrupting the processing flow. Because the pretreatment removes scale-causing ions, the residue on the filter screen surface is mainly composed of crystal particles rather than a dense scale layer. Combined with the self-cleaning mechanism of high-pressure rinsing, the filter screen regeneration difficulty is reduced, the cleaning cycle is extended, and the consumption of chemicals and the frequency of manual maintenance are reduced. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of a chemical wastewater filtration system for pre-crystallization pretreatment.

[0020] Figure 2 This is a cross-sectional view of the treatment box and filter cartridge in a pre-crystallization pretreatment chemical wastewater filtration structure.

[0021] Figure 3 for Figure 2 Enlarged view of point A in the image.

[0022] Figure 4 This is a schematic diagram showing the breakdown of a self-cleaning mechanism in a chemical wastewater filtration structure used for pre-crystallization pretreatment.

[0023] Figure 5 This is a front view of the self-cleaning mechanism in the filter structure of the pre-crystallization pretreatment chemical wastewater.

[0024] Figure 6 This is a schematic diagram showing the half-section of the sleeve and the disassembled drive shaft in the filter structure for pre-crystallization of chemical wastewater.

[0025] Figure 7 This is a cross-sectional view of the treatment tank in the pre-crystallization pretreatment chemical wastewater filtration structure.

[0026] Figure 8 for Figure 7 Enlarged view of point B in the image.

[0027] Figure 9This is a cross-sectional view of the slide plate, sleeve, collar, and disk in the filter structure for pre-crystallization of chemical wastewater.

[0028] Figure 10 for Figure 9 Enlarged view of point C in the image.

[0029] Figure 11 for Figure 9 Enlarged view of point D in the image.

[0030] Figure 12 A schematic diagram showing the breakdown of a portion of the alternating drive mechanism in a chemical wastewater filtration structure for pre-crystallization pretreatment.

[0031] In the diagram: 1. Processing box; 101. Crystallization settling zone; 102. Clear water discharge zone; 2. Filter cartridge; 201. Groove opening; 3. Filter screen; 4. Crystallization induction frame; 5. L-shaped guide rail; 6. Moving plate; 601. Inclined groove; 7. Rectangular block; 8. Slide rod; 9. Drive shaft; 901. Annular track groove; 10. Sleeve; 11. Sphere; 12. Water pipe; 13. High-pressure nozzle; 14. Rotating rod; 1401. Spiral groove; 1402. Straight groove; 15. Rotating shaft; 1501. Shaft groove; 1502. Threaded groove; 16. Slide plate; 17. Sleeve; 18. Collar; 19. Ball bearing; 20. Steel ball; 21. Disc; 22. Slide frame; 23. Connecting rod; 24. Eccentric column; 25. Gear motor; 26. Small pulley; 27. Large pulley; 28. Toothed belt. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Please see Figures 1-12 As an embodiment of the present invention, a pre-crystallization pretreatment chemical wastewater filtration structure includes a treatment tank 1, a filter cartridge 2, and a filter screen 3. The filter cartridge 2 is disposed inside the treatment tank 1, dividing the inner cavity of the treatment tank 1 into a crystallization settling zone 101 and a clear water discharge zone 102. A crystallization induction frame 4 is disposed in the crystallization settling zone 101, and the crystallization induction frame 4 is filled with a crystal seed carrier and a flocculant. The filter screen 3 is configured as two screens, which are sequentially inserted into the filter cylinder 2 along the axial direction of the filter cylinder 2 to perform two-stage filtration of the wastewater passing through the filter cylinder 2. The processing box 1 is equipped with two sets of self-cleaning mechanisms, which are respectively connected to two filters 3. When any one of the self-cleaning mechanisms is running, it can drive the filter 3 connected to it to move out of the filter cylinder 2 and perform high-pressure washing on the surface of the filter 3. The processing box 1 is also equipped with an alternating drive mechanism, which is in transmission cooperation with two sets of self-cleaning mechanisms respectively; when the alternating drive mechanism is running, the two sets of self-cleaning mechanisms operate alternately to ensure that at least one set of filter screens 3 is always in the filtration position inside the filter cartridge 2.

[0034] In this embodiment, the chemical wastewater first enters the crystallization settling zone 101 of the treatment tank 1, and comes into full contact with the seed carrier and flocculant in the crystallization induction frame 4. During this process, the hardness ions and phosphates in the wastewater undergo an induced crystallization reaction on the surface of the seed carrier to form large-diameter crystals, thereby realizing the transformation of scale-causing pollutants from the liquid phase to the solid phase. After the crystallization reaction is completed, the wastewater carrying crystal particles enters the filter cartridge 2 and flows sequentially through two stages of filter screens 3 along the axial direction of the filter cartridge 2. The first stage filter screen 3 performs coarse filtration on the wastewater, trapping larger crystal particles and suspended solids. The second stage filter screen 3 performs fine filtration to further remove fine crystal residues, ensuring that the effluent entering the clear water discharge zone 102 meets the influent requirements of the subsequent treatment unit. During continuous filtration, trappings gradually accumulate on the surfaces of the two filter screens 3, and the filtration resistance increases accordingly. At this time, the alternating drive mechanism is activated and outputs power to one of the self-cleaning mechanisms according to a preset sequence. After receiving the power, the self-cleaning mechanism drives the filter screen 3 connected to it to move out of the filter cartridge 2. At the same time, the surface of the filter screen 3 is subjected to high-pressure washing to remove the crystal particles and impurities attached to it and restore the flow rate of the filter screen 3. During the cleaning of this filter screen 3, another filter screen 3 remains inserted in the filter cartridge 2 and continues to perform the filtration function, ensuring that the wastewater in the filter cartridge 2 is always effectively filtered before entering the clean water discharge area 102, and the entire treatment process is not interrupted due to the maintenance of a single filter screen 3. After the first filter screen 3 has finished cleaning and reset, the alternating drive mechanism switches the power output direction and starts another set of self-cleaning mechanisms, which drives the second filter screen 3 to move out and perform high-pressure rinsing. The two sets of self-cleaning mechanisms operate alternately in this cycle, so that the two filter screens 3 take turns in the cleaning state and the filtration state. There is always at least one filter screen 3 in the filter cartridge 2, which maintains the working position, thereby achieving continuous and stable operation of the system.

[0035] As a further embodiment of the present invention, the self-cleaning mechanism includes an L-shaped guide rail 5 and a movable plate 6. The L-shaped guide rail 5 is installed inside the processing box 1, and the movable plate 6 is horizontally slidably disposed inside the processing box 1. The top of the filter cartridge 2 is provided with a slot 201, and the filter screen 3 is vertically inserted into the filter cartridge 2 through the slot 201; A rectangular block 7 is provided on the top of the filter screen 3, and the rectangular block 7 is slidably disposed within the L-shaped guide rail 5; The movable plate 6 has an inclined groove 601, and the top of the filter screen 3 is provided with a sliding rod 8, which is slidably fitted into the inclined groove 601. When the moving plate 6 moves horizontally, the inclined groove 601, the slide bar 8, the rectangular block 7, and the L-shaped guide rail 5 work together to make the filter screen 3 first move vertically out of the filter cylinder 2 and then slide horizontally.

[0036] In this embodiment, please refer to Figure 3 and Figure 4 When the alternating drive mechanism is running, power is transmitted to the moving plate 6, which drives the moving plate 6 to slide horizontally inside the processing box 1. The inclined groove 601 on the moving plate 6 moves horizontally synchronously with the moving plate 6. Since the slide rod 8 is fitted into the inclined groove 601, the inclined side wall of the inclined groove 601 applies a thrust perpendicular to the groove wall to the slide rod 8. The vertical component of this thrust overcomes the insertion resistance of the filter screen 3 in the filter cylinder 2, causing the slide rod 8 to drive the filter screen 3 to move upward in the vertical direction. The rectangular block 7 connected to the top of the filter screen 3 slides upward synchronously along the vertical section of the L-shaped guide rail 5 until the filter screen 3 is completely pulled out from the groove 201 at the top of the filter cylinder 2. When the rectangular block 7 slides to the top of the vertical section of the L-shaped guide rail 5, it enters the horizontal turning section of the guide rail. At this time, the cooperation relationship between the horizontal section of the inclined groove 601 and the slide rod 8 changes. The thrust generated by the moving plate 6 continuing to move horizontally turns to the horizontal direction. The rectangular block 7 is subjected to this horizontal thrust and slides along the horizontal section of the L-shaped guide rail 5, driving the extracted filter screen 3 to move horizontally away from the filter cylinder 2, thereby providing space for the high-pressure washing operation. After the high-pressure rinsing is completed, the moving plate 6 slides horizontally in the opposite direction. The rectangular block 7 first moves back along the horizontal section of the L-shaped guide rail 5 to the vertical turning point. Then, with the cooperation of the inclined groove 601 and the slide rod 8, it moves downward along the vertical section of the L-shaped guide rail 5, and inserts the filter screen 3 back vertically into the groove 201 of the filter cartridge 2, restoring its filtration position.

[0037] As a further embodiment of the present invention, the self-cleaning mechanism further includes a drive shaft 9 and a sleeve 10, wherein the drive shaft 9 is horizontally rotatably mounted on the processing box 1. The length direction of the drive shaft 9 is the same as the movement direction of the moving plate 6, and the sleeve 10 is slidably sleeved on the outer wall of the drive shaft 9 and connected to the moving plate 6. The outer wall of the drive shaft 9 is provided with an annular track groove 901 along its length direction, and the inner wall of the sleeve 10 is fitted with a ball 11, which is also fitted with the annular track groove 901. The processing tank 1 has a vertically arranged water pipe 12 inside, which is connected to a water pump. Multiple high-pressure nozzles 13 are arranged vertically and evenly on one side of the water pipe 12. The filter screen 3 will pass through multiple high-pressure nozzles 13 during the translation process.

[0038] In this embodiment, please refer to Figure 5 and Figure 6 The drive shaft 9 receives the rotational power from the alternating drive mechanism and rotates horizontally around its own axis. Since the outer wall of the drive shaft 9 is provided with an annular track groove 901 extending along the length direction, and the ball 11 embedded in the inner wall of the sleeve 10 rolls in the annular track groove 901, the rotational motion of the drive shaft 9 is converted into the linear motion of the sleeve 10 along the length direction of the drive shaft 9 through the helical transmission cooperation between the ball 11 and the annular track groove 901. The sleeve 10 is fixedly connected to the moving plate 6, so when the sleeve 10 moves, it synchronously drives the moving plate 6 to slide horizontally along the length direction of the drive shaft 9. During the horizontal sliding process of the moving plate 6, its inclined groove 601 moves relative to the slide bar 8 at the top of the filter screen 3. Combined with the guiding constraint of the L-shaped guide rail 5 on the rectangular block 7, the filter screen 3 is first pulled vertically out of the filter cylinder 2 and then moves horizontally to the cleaning station. Along the path of the horizontal movement of the filter screen 3, the vertically arranged water pipe 12 inside the treatment box 1 is connected to the water pump. Multiple high-pressure nozzles 13 are evenly arranged vertically on one side of the water pipe 12. During the horizontal movement, the filter screen 3 passes in front of each high-pressure nozzle 13 in sequence. The high-pressure water flow output by the water pump is distributed to each high-pressure nozzle 13 through the water pipe 12, forming a fan-shaped jet covering the entire height range of the filter screen 3. The filter screen 3 receives continuous scouring of multiple high-pressure water flows in the relative movement state. The crystal particles and impurities attached to the screen surface are peeled off and dispersed, realizing the regeneration and restoration of the filter screen 3 flux.

[0039] As a further embodiment of the present invention, the alternating drive mechanism includes a rotating rod 14, a rotating shaft 15, and a sliding plate 16, wherein the rotating rod 14 and the rotating shaft 15 are both horizontally rotatably mounted on the processing box 1; The slide plate 16 is provided with a sleeve 17 and a collar 18 respectively. The sleeve 17 is coaxially slidably sleeved on the outer wall of the rotating rod 14, and the collar 18 is coaxially slidably sleeved on the outer wall of the rotating shaft 15. The outer wall of the rotating rod 14 is provided with a spiral groove 1401 and a straight groove 1402 along its length direction, and the spiral groove 1401 and the straight groove 1402 are interconnected. The inner wall of the sleeve 17 is fitted with rolling balls 19, which are also fitted into the spiral groove 1401. The outer wall of the rotating shaft 15 is provided with a shaft groove 1501 and a threaded groove 1502 along its length direction, and the shaft groove 1501 and the threaded groove 1502 are interconnected. The inner wall of the collar 18 is fitted with a steel ball 20, which is also fitted with the shaft groove 1501. During the translation of the slide plate 16, when the ball 19 slides from the spiral groove 1401 into the straight groove 1402, the steel ball 20 slides from the shaft groove 1501 into the threaded groove 1502. The alternating drive mechanism also includes a disc 21, a slide 22 and a connecting rod 23. The disc 21 is horizontally rotatably mounted on the processing box 1, and the slide 22 is horizontally slidably mounted on the processing box 1 with one end connected to the slide plate 16. An eccentric column 24 is provided on the disc 21, and the two ends of the connecting rod 23 are respectively rotatably connected to the other end of the slide 22 and the eccentric column 24; The processing box 1 is equipped with a geared motor 25, and the output end of the geared motor 25 is coaxially connected to the disc 21. Small pulleys 26 are coaxially arranged on the rotating rod 14 and the rotating shaft 15, and large pulleys 27 are coaxially arranged on both driving shafts 9. The small pulleys 26 and the large pulleys 27 are connected by a toothed belt 28.

[0040] In this embodiment, please refer to Figures 8~12 After the geared motor 25 starts, its output end drives the disk 21 to rotate horizontally around the vertical axis. The eccentric column 24 on the disk 21 moves in a circular motion synchronously with the disk 21. The circular motion of the eccentric column 24 is transmitted to the slide 22 through the connecting rod 23, which is converted into the reciprocating linear sliding of the slide 22 in the horizontal direction. One end of the slide 22 is fixedly connected to the slide plate 16. Therefore, the reciprocating sliding of the slide 22 synchronously drives the slide plate 16 to move horizontally back and forth on the processing box 1. During the translation of the slide plate 16, the sleeve 17 and the collar 18 on it move synchronously. In the initial state, the ball 19 in the sleeve 17 is engaged in the spiral groove 1401 on the outer wall of the rotating rod 14, and the steel ball 20 in the collar 18 is engaged in the shaft groove 1501 on the outer wall of the rotating shaft 15. At this time, the rotating rod 14 and the rotating shaft 15 are both in a stationary state. When the slide plate 16 moves to a specific position to one side, the ball 19 is constrained by the inner wall of the sleeve 17 and slides from the end of the spiral groove 1401 into the straight groove 1402 that is connected to it. After the ball 19 enters the straight groove 1402, its circumferential position relative to the axis of the rotating rod 14 is fixed. The linear movement of the sleeve 17 along the length of the rotating rod 14 is converted into the rotational motion of the rotating rod 14 around its own axis through the cooperation of the ball 19 and the straight groove 1402. At the same time, the steel ball 20 slides from the end of the shaft groove 1501 into the threaded groove 1502 that is connected to it. After the steel ball 20 enters the threaded groove 1502, its circumferential position relative to the axis of the rotating shaft 15 is spirally constrained. The linear movement of the collar 18 is converted into the rotational motion of the rotating shaft 15 around its own axis through the cooperation of the steel ball 20 and the threaded groove 1502. Because the connection positions of the spiral groove 1401 and the straight groove 1402, and the connection positions of the shaft groove 1501 and the threaded groove 1502 are staggered in the direction of movement of the slide plate 16, when the ball 19 slides from the spiral groove 1401 into the straight groove 1402, the steel ball 20 simultaneously slides from the shaft groove 1501 into the threaded groove 1502. Conversely, when the ball 19 returns from the straight groove 1402 to the spiral groove 1401, the steel ball 20 also simultaneously returns from the threaded groove 1502 to the shaft groove 1501. Thus, during one reciprocating translation of the slide plate 16, the rotating rod 14 and the rotating shaft 15 alternately obtain rotational power, realizing time-sharing drive. Two small pulleys 26 on the rotating rod 14 and the rotating shaft 15 are connected to large pulleys 27 on the two drive shafts 9 via toothed belts 28. When the rotating rod 14 rotates, the small pulleys 26 on it are driven by the toothed belts 28 to drive the drive shafts 9 of one set of self-cleaning mechanisms to rotate. When the rotating shaft 15 rotates, the small pulleys 26 on it are driven by the toothed belts 28 to drive the drive shafts 9 of the other set of self-cleaning mechanisms to rotate. The rotational movements of the two drive shafts 9 are staggered in time, so that the two sets of self-cleaning mechanisms drive the two filter screens 3 to alternately perform extraction cleaning and resetting filtration, ensuring that at least one filter screen 3 is always in the filtration position inside the filter cartridge 2.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pre-crystallization pretreatment chemical wastewater filtration structure, comprising a treatment tank (1), a filter cartridge (2), and a filter screen (3), characterized in that, The filter cartridge (2) is installed inside the treatment box (1), dividing the inner cavity of the treatment box (1) into a crystallization settling zone (101) and a clear water discharge zone (102); a crystallization induction frame (4) is installed in the crystallization settling zone (101), and the crystallization induction frame (4) is filled with a seed carrier and a flocculant. The filter screen (3) is configured as two, and the two filter screens (3) are sequentially inserted into the filter cylinder (2) along the axial direction of the filter cylinder (2) to perform two-stage filtration of the sewage passing through the filter cylinder (2); The processing box (1) is equipped with two sets of self-cleaning mechanisms, which are respectively connected to the two filters (3). When any one of the self-cleaning mechanisms is running, it can drive the filter (3) connected to it to move out of the filter cylinder (2) and perform high-pressure washing on the surface of the filter (3). The processing box (1) is also provided with an alternating drive mechanism, which is in transmission cooperation with two sets of self-cleaning mechanisms respectively; when the alternating drive mechanism is running, the two sets of self-cleaning mechanisms run alternately to ensure that at least one set of filter screens (3) is always in the filtration position inside the filter cartridge (2).

2. The chemical wastewater filtration structure for pre-crystallization pretreatment according to claim 1, characterized in that, The self-cleaning mechanism includes an L-shaped guide rail (5) and a movable plate (6). The L-shaped guide rail (5) is installed inside the processing box (1), and the movable plate (6) is horizontally slidably disposed inside the processing box (1). The top of the filter cylinder (2) is provided with a slot (201), and the filter screen (3) is vertically inserted into the filter cylinder (2) through the slot (201).

3. The chemical wastewater filtration structure for pre-crystallization pretreatment according to claim 2, characterized in that, A rectangular block (7) is provided on the top of the filter screen (3), and the rectangular block (7) is slidably disposed in the L-shaped guide rail (5); The movable plate (6) is provided with an inclined groove (601), and the top of the filter screen (3) is provided with a slide rod (8), which slides and fits into the inclined groove (601). When the moving plate (6) moves horizontally, the inclined groove (601) and the slide rod (8), the rectangular block (7) and the L-shaped guide rail (5) work together to make the filter screen (3) move vertically out of the filter cylinder (2) and then slide horizontally.

4. The chemical wastewater filtration structure for pre-crystallization pretreatment according to claim 2, characterized in that, The self-cleaning mechanism also includes a drive shaft (9) and a sleeve (10), the drive shaft (9) being horizontally rotatably mounted on the processing box (1); The length direction of the drive shaft (9) is the same as the moving direction of the moving plate (6), and the sleeve (10) is slidably sleeved on the outer wall of the drive shaft (9) and connected to the moving plate (6).

5. The chemical wastewater filtration structure for pre-crystallization pretreatment according to claim 4, characterized in that, The outer wall of the drive shaft (9) is provided with an annular track groove (901) along its length direction, and the inner wall of the sleeve (10) is fitted with a ball (11) which is also fitted with the annular track groove (901). The processing box (1) is vertically equipped with a water pipe (12), which is connected to a water pump. Multiple high-pressure nozzles (13) are vertically and evenly arranged on one side of the water pipe (12). The filter screen (3) will pass through multiple high-pressure nozzles (13) during the translation process.

6. The chemical wastewater filtration structure for pre-crystallization pretreatment according to claim 4, characterized in that, The alternating drive mechanism includes a rotating rod (14), a rotating shaft (15), and a sliding plate (16). The rotating rod (14) and the rotating shaft (15) are both horizontally rotatably mounted on the processing box (1). The slide plate (16) is provided with a sleeve (17) and a collar (18). The sleeve (17) is coaxially slidably sleeved on the outer wall of the rotating rod (14), and the collar (18) is coaxially slidably sleeved on the outer wall of the rotating shaft (15).

7. The chemical wastewater filtration structure for pre-crystallization pretreatment according to claim 6, characterized in that, The outer wall of the rotating rod (14) is provided with a spiral groove (1401) and a straight groove (1402) along its length direction, and the spiral groove (1401) and the straight groove (1402) are interconnected. The inner wall of the sleeve (17) is fitted with rolling balls (19), which are also fitted into the spiral groove (1401).

8. The chemical wastewater filtration structure for pre-crystallization pretreatment according to claim 7, characterized in that, The outer wall of the rotating shaft (15) is provided with a shaft groove (1501) and a thread groove (1502) along its length direction, and the shaft groove (1501) and the thread groove (1502) are interconnected. The inner wall of the collar (18) is fitted with a steel ball (20), which is also fitted with the shaft groove (1501). During the translation of the slide plate (16), when the ball (19) slides from the spiral groove (1401) into the straight groove (1402), the steel ball (20) slides from the shaft groove (1501) into the threaded groove (1502).

9. A chemical wastewater filtration structure for pre-crystallization pretreatment according to claim 6, characterized in that, The alternating drive mechanism also includes a disc (21), a slide (22) and a connecting rod (23). The disc (21) is horizontally rotatably mounted on the processing box (1), and the slide (22) is horizontally slidably mounted on the processing box (1) with one end connected to the slide plate (16). An eccentric column (24) is provided on the disc (21), and the two ends of the connecting rod (23) are rotatably connected to the other end of the slide (22) and the eccentric column (24), respectively.

10. A chemical wastewater filtration structure for pre-crystallization pretreatment according to claim 9, characterized in that, A geared motor (25) is installed on the processing box (1), and the output end of the geared motor (25) is coaxially connected to the disc (21); Small pulleys (26) are coaxially arranged on the rotating rod (14) and the rotating shaft (15), and large pulleys (27) are coaxially arranged on both driving shafts (9). The small pulleys (26) and the large pulleys (27) are connected by a toothed belt (28).

Images