Three-stage cooling crystallization system and process

Abstract

The invention discloses a three-stage cooling crystallization system and process, and relates to the technical field of industrial crystallization equipment, the three-stage cooling crystallization system comprises a first cooling tank, a second cooling tank and a third cooling tank, condensation cavities for circulation of condensed liquid are formed in the inner walls of shells of the three cooling tanks, a circulation assembly for circulating the condensed liquid is arranged on one side of each cooling tank, and the condensation cavities are communicated with the circulation assembly. Condensed liquid flows in from the condensation chamber of the third cooling tank and flows out from the condensation chamber of the first cooling tank; an inlet for a solution to enter is formed in the side wall of each cooling tank, a conveying pipe for conveying the solution is arranged between every two adjacent cooling tanks, a valve is mounted on each conveying pipe, and inner cavities of every two adjacent cooling tanks are communicated through the corresponding conveying pipe; a filter plate I is obliquely arranged in the cooling tank III, and an outlet for discharging crystals is formed in the side wall of the cooling tank III. The crystal forming device has the advantages that the crystal forming quality is improved, and meanwhile, the growth rate of the crystal is increased, so that the overall production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of industrial crystallization equipment, and in particular to a three-stage cooling crystallization system and process. Background Art

[0002] Cooling crystallization is a common crystallization process, widely used in a variety of fields, including chemical engineering, pharmaceuticals, food processing, and environmental protection. Industrial crystallization is a core process for separation and purification of substances, and its efficiency and crystal quality directly impact the added value of the product. Cooling crystallization effectively separates solutes and solvents, yielding high-purity crystals that meet the high-quality demands of industrial production. Cooling crystallization technology also plays a vital role in industrial production and environmental protection, effectively improving product quality and purity, enabling resource recovery and recycling, and reducing energy consumption and production costs.

[0003] At present, the traditional single-stage cooling crystallization tank adopts an overall cooling method. The supersaturation of the solution is difficult to control accurately, which can easily lead to an imbalance between explosive nucleation and crystal growth, a wide product particle size distribution, and the need for subsequent screening, which increases costs. In addition, the cooling rate of the traditional single-stage cooling crystallization tank is limited by a single heat exchange device, resulting in low heat exchange efficiency and slow crystal growth, which is difficult to meet the needs of efficient production. Summary of the Invention

[0004] In order to improve the quality of crystal formation and at the same time to increase the growth rate of crystals, thereby improving overall production efficiency; the present application provides a three-stage cooling crystallization system and process.

[0005] The three-stage cooling crystallization system provided in this application adopts the following technical solution: A three-stage cooling crystallization system comprises a cooling tank 1, a cooling tank 2 and a cooling tank 3 which are arranged in sequence from top to bottom in a vertical direction. Condensation chambers for condensed liquid circulation are provided in the inner walls of the shells of the three cooling tanks. The condensation chambers on the inner walls of the three cooling tanks are connected. A circulation component for circulating condensed liquid is provided on one side of the three cooling tanks. Condensed liquid flows into the condensation chamber of the cooling tank 3 and flows out of the condensation chamber of the cooling tank 1. An inlet for solution entry is provided on the side wall of the cooling tank, and a condenser is provided between two adjacent cooling tanks. A delivery pipe for delivering the solution is provided, a valve is installed on the delivery pipe, and the inner cavities of the two adjacent cooling tanks are connected through the delivery pipe; a first stirring component and a second stirring component for stirring the solution are respectively provided in the cooling tank one and the cooling tank two, a scraper for scraping off crystals on its inner wall is rotatably provided in the cooling tank two, and an adjustment mechanism for adjusting the distance between the scraper and its inner wall is also provided in the cooling tank two; a filter plate one is obliquely provided in the cooling tank three, and an outlet for discharging crystals is opened on the side wall of the cooling tank three.

[0006] By adopting the above technical solution, the condensation chambers on the inner wall of the cooling tank are interconnected to form a series cooling circuit. The condensed liquid flows in from the cooling tank three, flows through the cooling tank two and the cooling tank one in turn, and then flows out. The temperature in the cooling tank three to the cooling tank one gradually increases; the solution enters from the inlet of the cooling tank one, and undergoes preliminary cooling and crystallization in the cooling tank one. The solution after preliminary cooling enters the cooling tank two through the delivery pipe and continues to cool and crystallize. The first stirring component and the second stirring component can promote the mixing of the solution, and the scraper can rotate to scrape off the crystals on the inner wall of the cooling tank two. At the same time, the scraper can adjust the effect of the adjustment mechanism. Under the present invention, the distance between the scraper and the inner wall of the cooling tank can be adjusted according to the thickness of the crystals on the inner wall of the cooling tank 2, thereby avoiding excessive scraping to cause crystal breakage, helping to maintain the integrity of the crystals and improve the quality and purity of the crystals; finally, the solution enters the cooling tank 3 for final cooling and crystallization, the filter plate 1 intercepts the crystals, and the crystals are discharged through the outlet; the overall multi-stage cooling system improves the cooling efficiency and the quality of crystal growth, ensures the continuity and stability of the cooling process, avoids local overcooling or overheating, improves the purity and recovery rate of the crystals, and at the same time reduces the waste of mother liquor and improves resource utilization.

[0007] Preferably, the first stirring assembly includes a stirring rod and a motor, the stirring rod is rotatably arranged in the cooling tank, and a plurality of stirring plates are fixedly arranged on the side wall of the stirring rod, the motor is installed on the outer wall of the cooling tank, and the end of the stirring rod is fixedly arranged on the rotating shaft on the motor.

[0008] By adopting the above technical solution, when the motor is started, the rotating shaft on the motor drives the stirring rod to rotate, and the stirring plate rotates accordingly, stirring the solution in the cooling tank, so that the solution is evenly mixed, promoting the uniform distribution of the solute and heat exchange, accelerating the crystal growth process, and at the same time avoiding the local concentration of the solute in the solution being too high or too low, ensuring the uniformity of crystal growth, and improving the quality and yield of the crystal.

[0009] Preferably, the second stirring component includes a stirring rod 2 and a motor 2, the stirring rod 2 is rotatably arranged in the cooling tank 2, and a plurality of stirring plates 2 are installed on the side wall of the stirring rod 2, the motor 2 is installed on the outer wall of the cooling tank 2, and the end of the stirring rod 2 is installed on the rotating shaft on the motor 2.

[0010] By adopting the above technical solution, when the second motor is started, the rotating shaft on the second motor drives the stirring rod to rotate, and the second stirring plate rotates accordingly, stirring the solution in the second cooling tank, so that the solution is evenly mixed, further promoting the growth of crystals and ensuring the uniformity of crystal growth; through continuous stirring, excessive adhesion of crystals to the inner wall of the second cooling tank is avoided, the recovery rate of crystals is improved, and at the same time the frequency of cleaning the inner wall is reduced, thereby reducing maintenance costs.

[0011] Preferably, the second stirring rod is rotatably arranged on the rotating shaft of the second motor, and a torsion spring 1 is sleeved on the rotating shaft of the second motor, and the two ends of the torsion spring 1 are respectively fixedly arranged on the rotating shaft of the second motor and the side wall of the second stirring rod; a rotating rod 1 is arranged in the second stirring rod, one end of the rotating rod 1 is fixedly arranged on the rotating shaft of the second motor, and a rotating rod 2 is fixedly arranged on the side wall of the second stirring plate, and the second rotating rod is rotatably arranged on the side wall of the second stirring rod, a bevel gear 1 is fixedly arranged on the rotating rod 1, and a bevel gear 2 is fixedly arranged on the rotating rod 2, and the bevel gear 1 is meshed with the bevel gear 2; a torsion spring 2 is sleeved on the second rotating rod, and the two ends of the torsion spring 2 are respectively fixedly arranged on the second stirring plate and the second stirring rod.

[0012] By adopting the above technical solution, when motor 2 is turned on, the rotating shaft on motor 2 can drive the stirring rod 2 and the stirring plate 2 to rotate at the same time through the torsion spring 1. The torsion spring 2 provided can reduce the possibility of the stirring plate 2 rotating around the rotating rod 2 at will through its own torsion force; when there are clustered crystals in the solution, which causes the resistance of the solution to increase, the resistance encountered by the stirring plate 2 increases at this time, so the stirring plate 2 can drive the stirring rod 2 and the rotating shaft on motor 2 and the rotating rod 1 to rotate relative to each other, at this time the bevel gear 1 can drive the bevel gear 2 to rotate, and the bevel gear 2 drives the rotating rod 2 and the stirring plate 2 to rotate and tilt, so that the contact area between the stirring plate 2 and the solution in the rotation direction is reduced, and the stirring plate 2 can automatically adjust the contact area with the solution according to the resistance of the solution to avoid crystal breakage caused by excessive stirring. At the same time, when the stirring plate 2 rotates and tilts, it can gradually form a cutting posture for the clustered crystals, which can prevent excessive growth of crystals and ensure the uniformity and consistency of the crystals; in addition, the possibility of damage to the equipment is reduced and the service life of the equipment is extended.

[0013] Preferably, a through-hole is provided in the side wall of the second stirring plate, a filter plate is slidably provided in the through-hole, a rotating plate is fixedly provided on the second stirring rod, and a liquid storage cavity for storing the solution is provided in the rotating plate; a brush is slidably provided in the through-hole, and the brush consists of bristles and a brush plate, and the bristles on the brush slide and fit into the side wall of the second filter plate, and the second stirring plate is provided with a driving component for driving the brush to move; the side wall of the second stirring plate is connected to a hose, and the two ends of the hose are respectively connected to the liquid storage cavity in the through-hole and the rotating plate, and the liquid storage cavity of the rotating plate is connected to the inner cavity of the cooling tank three through the delivery pipe provided between the second cooling tank and the third cooling tank, and the second stirring plate is provided with a first vibration component for driving the second filter plate to vibrate, and the through-hole is also provided with a dredging component for dredging crystals near the hose.

[0014] By adopting the above technical solution, when the stirring plate 2 rotates, the filter plate 2 provided can filter out the smaller crystals that are not fully formed, and leave the crystals that have been formed into a larger volume on the filter plate 2. The driving component provided drives the brush to move, and the bristles on the brush clean the filter plate 2 to prevent the crystals from being blocked; at the same time, the first vibration component provided can drive the filter plate 2 to vibrate, further preventing the crystals from being blocked; the crystals can gradually enter the hose under the vibration of the brush and the filter plate 2, and the unblocking component provided reduces the possibility of the crystals being blocked at the entrance of the hose. The crystals enter the liquid storage cavity of the rotating plate through the hose, and then enter the cooling tank 3 through the delivery pipe for final cooling and forming; the overall solution further improves the efficiency and quality of crystal forming.

[0015] Preferably, the driving assembly includes a bidirectional screw and a motor three, the bidirectional screw is rotatably arranged on the side wall of the stirring plate two, the brush plate thread on the brush is engaged with the bidirectional screw, the motor three is installed on the side wall of the stirring plate two, and one end of the bidirectional screw is fixedly arranged on the rotating shaft on the motor three.

[0016] By adopting the above technical solution, the staff turns on motor three, which can drive the bidirectional screw to rotate. The rotation of the bidirectional screw can drive the brush to move back and forth on filter plate two, thereby reducing the difficulty of moving the brush.

[0017] Preferably, the first vibration component includes an abutment block, a slide plate and a spring 1, and a plurality of top blocks are fixedly provided on the side wall of the filter plate 2 along the movement direction of the brush; the abutment block is fixedly provided on the brush plate of the brush, and the abutment block is provided with an arc surface on the side close to the top block, and the abutment block slides and cooperates with the top block through its arc surface; the slide plate is fixedly provided on the side wall of the filter plate 2, and the slide plate slides in the side wall of the stirring plate 2, the spring 1 is provided in the side wall of the stirring plate 2, and the two ends of the spring 1 are respectively fixed on the slide plate and the inner wall of the stirring plate 2.

[0018] By adopting the above technical solution, when the brush moves, it drives the abutment block to move at the same time. The abutment block continuously pushes the top block to move through its arc surface, and the top block pushes the filter plate 2 to move. The filter plate 2 can move repeatedly under the action of the top block and the spring 1, thereby vibrating the crystal.

[0019] Preferably, the adjustment mechanism includes a driving plate vertically arranged in the second cooling tank, one end of the driving plate is fixedly arranged on the rotating plate, a sliding groove is provided on the side of the driving plate close to the inner wall of the second cooling tank, the scraper slides in the sliding groove, an inclined groove is provided on the top or bottom of the driving plate, the distance between the inclined groove and the inner wall of the second cooling tank gradually increases from its starting point to its end point, a guide rod is fixedly provided on the scraper, the guide rod slides from the starting point of the inclined groove to the end point of the inclined groove, and a reset component for resetting the scraper is provided in the sliding groove.

[0020] By adopting the above technical solution, the driving plate drives the scraper to rotate in the cooling tank 2, and the scraper can slide in the sliding groove. When the scraper contacts a thicker crystal, making it difficult to hang the crystal down, the scraper continues to rotate, and the crystal can push the scraper to move. At this time, the scraper drives the guide rod to slide along the inclined groove. Under the action of the inclined groove, the guide rod drives the scraper gradually away from the inner wall of the cooling tank 2, thereby ensuring that the scraper can effectively scrape off crystals of different thicknesses, thereby improving the recovery rate of the crystals, and at the same time reducing the possibility of damage to components in the equipment and extending the service life of the equipment.

[0021] Preferably, the side wall of the cooling tank three is connected to an air inlet pipe, a fan is rotatably installed in the air inlet pipe, the air inlet pipe is located below the filter plate one, the filter plate one slides in the cooling tank three, and the cooling tank three is provided with a second vibration component for driving the filter plate one to vibrate.

[0022] By adopting the above technical solution, the fan rotates to generate airflow, which blows towards the filter plate one, assisting in cooling the crystals and reducing friction; at the same time, the second vibration component drives the filter plate one to vibrate, helping the crystals to loosen and slide along the slide, and finally be discharged through the outlet; the airflow provided by the fan assists in cooling and reducing friction, which is conducive to the growth and sliding of the crystals; the vibration of the filter plate helps to loosen and discharge the crystals, thereby improving the crystal collection efficiency; through the synergistic effect of airflow and vibration, high-quality collection of crystals is ensured, while reducing the residue of crystals on the filter plate, thereby improving the overall efficiency of the system.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The condensation chambers on the inner wall of the cooling tank are interconnected to form a series cooling circuit. The condensed liquid flows into cooling tank three, flows through cooling tank two and cooling tank one in sequence, and then flows out. The temperature in cooling tank three to cooling tank one gradually increases; the solution enters from the inlet of cooling tank one and undergoes preliminary cooling crystallization in cooling tank one. The preliminarily cooled solution enters cooling tank two through a delivery pipe and continues cooling crystallization. The first stirring assembly and the second stirring assembly provided can promote solution mixing. The rotation of the scraper can scrape off the crystals on the inner wall of cooling tank two. At the same time, the scraper can adjust the distance between the scraper and the inner wall of the cooling tank according to the thickness of the crystals on the inner wall of cooling tank two under the action of the adjustment mechanism, thereby avoiding excessive scraping and causing crystal breakage, helping to maintain the integrity of the crystals and improving the quality and purity of the crystals; finally, the solution enters cooling tank three for final cooling crystallization, the filter plate one intercepts the crystals, and the crystals are discharged through the outlet; the overall multi-stage cooling system improves the cooling efficiency and the quality of crystal growth, ensures the continuity and stability of the cooling process, avoids local overcooling or overheating, improves the purity and recovery rate of the crystals, and reduces the waste of mother liquor and improves resource utilization; 2. The first and second stirring components promote uniform mixing of the solution, accelerating solute distribution and heat exchange. The scraper, under the action of the adjustment mechanism, can automatically adjust its distance from the inner wall of cooling tank two according to the thickness of the crystals on the inner wall, effectively scraping off the crystals and avoiding crystal breakage caused by excessive scraping. Filter plate one intercepts the crystals in cooling tank three and vibrates through the drive of the second vibrating component, helping the crystals loosen and slide down the slideway, ultimately being discharged through the outlet. The synergistic effect of these components improves the crystal recovery rate, while reducing the frequency of cleaning the inner wall and lowering maintenance costs. 3. The airflow provided by the fan assists cooling and the vibration of the filter plate. The fan rotates to generate airflow, which blows towards filter plate one to assist in cooling the crystals and reduce friction. At the same time, the second vibration component drives filter plate one to vibrate, helping the crystals to loosen and slide down the slide. The airflow provided by the fan assists cooling and reduces friction, which is conducive to the growth and sliding of crystals. The vibration of filter plate one helps to loosen and discharge the crystals, thereby improving the crystal collection efficiency. The synergistic effect of airflow and vibration ensures high-quality collection of crystals, while reducing the residue of crystals on the filter plate and improving the overall efficiency of the system.

[0024] A three-stage cooling crystallization process comprises the following steps: S1. Solution preparation and injection: Prepare a solution of a certain concentration according to the desired crystal type and purity requirements, and perform pretreatment to remove impurities and adjust the pH value. Inject the treated solution into cooling tank 1 through the inlet of cooling tank 1 to prepare for the cooling crystallization process; S2. Preliminary crystallization in cooling tank 1: The circulation component is started to circulate the condensed liquid in the condensation chamber of cooling tank 1 to preliminarily cool the solution; at the same time, motor 1 is started to rotate stirring rod 1 and stirring plate 1 to promote uniform distribution of the solute; as the temperature of the solution decreases, the solute gradually reaches a supersaturated state and precipitates small crystal nuclei, which gradually grow under the stirring action to form tiny crystals; S3. Crystal growth in cooling tank 2: Open the valve in the delivery pipe between cooling tanks 1 and 2 to transfer the solution containing crystals to cooling tank 2. Continue cooling the solution by condensing the liquid in the condensation chamber. Simultaneously, start motor 2 to rotate stirring rod 2 and stirring plate 2 to further promote crystal growth. Use a scraper to scrape off crystals on the inner wall of cooling tank 2 to ensure that the crystals can smoothly enter the solution and continue to grow. S4, final cooling and filtration in cooling tank three: Open the delivery pipe valve between cooling tanks two and three to deliver the solution containing crystals to cooling tank three; perform final cooling by condensing the liquid in the condensation chamber, while filter plate one intercepts larger crystal particles, and smaller crystals and mother liquor continue to circulate through the filter holes; S5. Crystal collection and discharge: The second vibration component drives the filter plate 1 to vibrate, loosening the crystals and causing them to slide down the slideway; the fan is started, and the airflow blows the crystals up and brings them to the outlet of the cooling tank 3, and finally discharges them from the system, completing the crystal collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a three-stage cooling crystallization system mainly embodied in an embodiment of the present application; Figure 2 This is a schematic diagram of the circulating pump structure mainly embodied in the embodiment of the present application; Figure 3This is a schematic diagram of a structure of a stirring plate mainly embodied in an embodiment of the present application; Figure 4 This is a schematic diagram of the scraper structure mainly embodied in the embodiment of the present application; Figure 5 This is a schematic diagram of the structure of a filter plate according to an embodiment of the present application; Figure 6 This is a schematic diagram of the second structure of the stirring plate according to the embodiment of the present application; Figure 7 for Figure 6 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram mainly showing a bidirectional lead screw structure according to an embodiment of the present application; Figure 9 This is a schematic diagram of a structure of a return spring mainly embodied in an embodiment of the present application; Figure 10 This is a schematic diagram mainly showing the gear structure of an embodiment of the present application.

[0026] Figure numerals: 1, cooling tank 1; 2, cooling tank 2; 3, cooling tank 3; 4, support; 5, circulation pipe; 6, circulation component; 61, liquid storage tank; 62, circulation pump; 63, liquid inlet pipe; 64, liquid outlet pipe; 7, inlet; 8, delivery pipe; 9, valve; 10, first stirring component; 101, stirring rod 1; 102, motor 1; 103, stirring plate 1; 11, second stirring component; 111, stirring rod 2; 112. Motor 2; 113. Torsion spring 1; 114. Stirring plate 2; 115. Rotating rod 1; 116. Rotating rod 2; 117. Bevel gear 1; 118. Bevel gear 2; 119. Torsion spring 2; 12. Scraper; 13. Adjustment mechanism; 131. Drive plate; 132. Sliding groove; 133. Inclined groove; 134. Guide rod; 14. Filter plate 1; 15. Outlet; 16. Perforation; 17. Filter plate 2 18. Rotating plate; 19. Brush; 20. Driving assembly; 201. Bidirectional screw; 202. Motor 3; 203. Connecting block; 21. Hose; 22. First vibrating assembly; 221. Abutting block; 222. Slide plate; 223. Spring 1; 224. Top block; 23. Dredging assembly; 231. Waterwheel; 232. Driving gear 1; 233. Driving gear 2; 24. Reset assembly; 241. Reset plate ; 242. Return spring one; 243. Return spring two; 244. Slide bar one; 245. Slide bar two; 25. Air inlet duct; 26. Filter plate four; 27. Fan; 28. Fixing plate; 29. ​​Placement plate; 30. Motor four; 31. Belt one; 32. Belt two; 33. Second vibration component; 331. Drive rod; 332. Push rod; 333. Gear; 334. Support plate; 335. Buffer spring. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-10 This application is described in further detail.

[0028] The present application embodiment discloses a three-stage cooling crystallization system, such as Figure 1 As shown, it includes cooling tank 1 1, cooling tank 2 2 and cooling tank 3 3 arranged in sequence from top to bottom in the vertical direction, and multiple pillars 4 are set between adjacent cooling tanks, and are connected through these pillars 4.

[0029] like Figure 1 and Figure 2 As shown, condensation chambers for the circulation of condensed liquid are provided in the inner walls of the shells of the three cooling tanks, and a circulation pipe 5 for the circulation of condensed liquid is provided between two adjacent cooling tanks, and both ends of the circulation pipe 5 are connected to the condensation chambers on the inner walls of the two adjacent cooling tanks; the condensation chambers on the inner walls of the three cooling tanks are connected, and a circulation component 6 for circulating the condensed liquid is provided on one side of the three cooling tanks. The circulation component 6 includes a liquid storage tank 61 for storing the condensed liquid, a circulation pump 62, a liquid inlet pipe 63 and a liquid outlet pipe 64. The circulation pump 62 is installed in the liquid storage tank 61, and both ends of the liquid outlet pipe 64 are respectively connected to the liquid outlet end of the circulation pump 62 and the condensation chamber on the inner wall of cooling tank three 3; the two ends of the liquid inlet pipe 63 are respectively connected to the liquid inlet of the circulation pump 62 and the condensation chamber on the inner wall of the cooling tank, and the condensed liquid flows into the condensation chamber of cooling tank three 3 and flows out of the condensation chamber of cooling tank one 1.

[0030] like Figure 3 、 Figure 4 and Figure 5 As shown, an inlet 7 for solution entry is provided on the top side wall of cooling tank 1, a delivery pipe 8 for delivering solution is provided between two adjacent cooling tanks, a valve 9 is installed on the delivery pipe 8, and the inner cavities of the two adjacent cooling tanks are connected through the delivery pipe 8; a first stirring assembly 10 and a second stirring assembly 11 for stirring the solution are respectively provided in cooling tank 1 and cooling tank 2 2, a scraper 12 for scraping off crystals on its inner wall is rotatably provided in cooling tank 2 2, and an adjusting mechanism 13 for adjusting the distance between the scraper 12 and its inner wall is also provided in cooling tank 2 2; a filter plate 14 is obliquely provided in cooling tank 3 3, and an outlet 15 for crystal discharge is provided on the side wall of cooling tank 3 3.

[0031] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the condensation chambers on the inner wall of the cooling tank are interconnected to form a series cooling circuit. The condensed liquid flows from the cooling tank 3 3 through the circulation pump 62 in the liquid storage tank 61, flows through the cooling tank 2 2 and the cooling tank 1 1 in sequence through the circulation pipe 5, and then flows back to the liquid storage tank 61. The temperature in the cooling tank 3 3 to the cooling tank 1 gradually increases; the solution enters from the inlet 7 of the cooling tank 1, and undergoes preliminary cooling and crystallization in the cooling tank 1. The solution after preliminary cooling enters the cooling tank 2 2 through the delivery pipe 8, and continues to cool and crystallize. The first stirring component 10 and the second stirring component 11 are provided to promote solution mixing, and the scraper 12 rotates to scrape off the crystals on the inner wall of the cooling tank 2 2. Under the action of the adjustment mechanism 13, the scraper 12 can adjust the distance between the scraper 12 and the inner wall of the cooling tank 2 according to the thickness of the crystals on the inner wall of the cooling tank 2, thereby avoiding excessive scraping and causing crystal breakage, helping to maintain the integrity of the crystals and improve the quality and purity of the crystals; finally, the solution enters the cooling tank 3 3 for final cooling and crystallization, the filter plate 1 14 intercepts the crystals, and the crystals are discharged through the outlet 15; the overall multi-stage cooling system improves the cooling efficiency and the quality of crystal growth, ensures the continuity and stability of the cooling process, avoids local overcooling or overheating, improves the purity and recovery rate of the crystals, and at the same time reduces the waste of mother liquor and improves resource utilization.

[0032] like Figure 1 and Figure 3 As shown, the first stirring component 10 includes a stirring rod 101 and a motor 102. The stirring rod 101 is vertically arranged in the cooling tank 1, and the end of the stirring rod 101 is rotatably connected to the inner wall of the cooling tank 1 through a bearing; a plurality of stirring plates 103 are fixedly connected to the side wall of the stirring rod 101, and the motor 102 is fixedly installed on the top side wall of the cooling tank 1 by bolts. The rotating shaft on the motor 102 is vertically arranged, and the top end of the stirring rod 101 is fixedly connected to the rotating shaft on the motor 102 through a coupling.

[0033] like Figure 1 and Figure 3 As shown, when the motor 102 is started, the shaft on the motor 102 drives the stirring rod 101 to rotate, and the stirring plate 103 rotates accordingly, stirring the solution in the cooling tank 1, so that the solution is evenly mixed, promoting uniform distribution of solutes and heat exchange, accelerating the growth process of crystals, and avoiding local solute concentrations in the solution being too high or too low, ensuring the uniformity of crystal growth, and improving the quality and yield of crystals.

[0034] like Figure 4 、 Figure 6 and Figure 7As shown, the second stirring component 11 includes a stirring rod 2 111 and a motor 2 112. The stirring rod 2 111 is vertically arranged in the cooling tank 2, and the end of the stirring rod 2 111 is rotatably connected to the inner wall of the cooling tank 2 2 through a bearing. The motor 2 112 is fixedly installed on the top of the cooling tank 2 2 by bolts, and the rotating shaft on the motor 2 112 is vertically arranged. The stirring rod 2 111 rotates on the rotating shaft on the motor 2 112. A torsion spring 113 is sleeved on the rotating shaft of the motor 2 112, and the two ends of the torsion spring 113 are respectively fixed to the rotating shaft on the motor 2 112 and the side wall of the stirring rod 2 111; the side wall of the stirring rod 2 111 is equipped with a plurality of stirring rods. Mixing plate 2 114, a rotating rod 115 is vertically arranged in the stirring rod 2 111, the top of the rotating rod 115 is fixedly connected to the rotating shaft on the motor 2 112, and a rotating rod 2 116 is fixedly arranged on the side of the stirring plate 2 114 close to the stirring rod 2 111. The rotating rod 2 116 is penetrated and rotatably connected to the side wall of the stirring rod 2 111, a bevel gear 117 is fixedly mounted on the rotating rod 115, and a bevel gear 2 118 is fixedly mounted on the rotating rod 2 116, and the bevel gear 117 is meshed with the bevel gear 2 118; a torsion spring 2 119 is mounted on the rotating rod 2 116, and the two ends of the torsion spring 2 119 are respectively fixedly mounted on the stirring plate 2 114 and the stirring rod 2 111.

[0035] like Figure 4 、 Figure 6 and Figure 7 As shown, when the motor 2 112 is started, the rotating shaft on the motor 2 112 drives the stirring rod 2 111 to rotate, and the stirring plate 2 114 rotates accordingly, stirring the solution in the cooling tank 2 2, so that the solution is evenly mixed, further promoting the growth of crystals and ensuring the uniformity of crystal growth; through continuous stirring, excessive adhesion of crystals to the inner wall of the cooling tank 2 2 is avoided, the recovery rate of crystals is improved, and at the same time the frequency of cleaning the inner wall is reduced, thereby reducing maintenance costs.

[0036] like Figure 4 、 Figure 6 and Figure 7As shown, when the motor 2 112 is turned on, the rotating shaft on the motor 2 112 can drive the stirring rod 2 111 and the stirring plate 2 114 to rotate simultaneously through the torsion spring 113, and the torsion spring 2 119 can reduce the possibility of the stirring plate 2 114 rotating around the rotating rod 2 116 by its own torsion force; when there are clusters of crystals in the solution, resulting in an increase in the resistance of the solution, the resistance of the stirring plate 2 114 increases, so the stirring plate 2 114 can drive the stirring rod 2 111 and the rotating shaft on the motor 2 112 and the rotating rod 115 to rotate relative to each other, and at this time the bevel gear 117 It can drive the bevel gear 118 to rotate, and the bevel gear 118 drives the rotating rod 116 and the stirring plate 114 to rotate and tilt, so that the contact area between the stirring plate 114 and the solution in the rotation direction is reduced. The stirring plate 114 can automatically adjust the contact area with the solution according to the resistance of the solution to avoid crystal breakage caused by excessive stirring. At the same time, when the stirring plate 114 rotates and tilts, it can gradually form a cutting posture for the cluster crystals, which can prevent the crystals from growing excessively and ensure the uniformity and consistency of the crystals. In addition, the possibility of damage to the equipment is reduced and the service life of the equipment is extended.

[0037] like Figure 6 and Figure 8 As shown, a through hole 16 is provided in the side wall of the second stirring plate 114, and the through hole 16 extends along the width direction of the second stirring plate 114. A filter plate 17 is provided in the through hole 16 along the width direction of the second stirring rod 111. A rotating plate 18 is fixed on the bottom end of the second stirring rod 111, and a liquid storage cavity for storing the solution is provided in the rotating plate 18; a brush 19 is provided in the through hole 16 along the length direction of the second stirring plate 114, and the brush 19 consists of bristles and a brush plate. The bristles on the brush 19 are slidably connected to the side wall of the second filter plate 17, stirring A driving component 20 for driving the brush 19 to move is provided on the second plate 114; a hose 21 is connected to the bottom side wall of the second stirring plate 114, and the two ends of the hose 21 are respectively connected to the liquid storage cavity in the perforation 16 and the rotating plate 18. The liquid storage cavity of the rotating plate 18 is connected to the inner cavity of the cooling tank three 3 through the delivery pipe 8 arranged between the cooling tank two 2 and the cooling tank three 3. A first vibration component 22 for driving the filter plate two 17 to vibrate is provided on the second stirring plate 114, and a dredging component 23 for dredging crystals is also provided near the perforation 16 and the hose 21.

[0038] like Figure 6 and Figure 8As shown, when the stirring plate 2 114 rotates, the filter plate 2 17 can filter out the smaller crystals that are not fully formed, and leave the crystals that have been formed into a larger volume on the filter plate 2 17. The driving component 20 drives the brush 19 to move, and the bristles on the brush 19 clean the filter plate 2 17 to prevent the crystals from being blocked. At the same time, the first vibration component 22 can drive the filter plate 2 17 to vibrate, further preventing the crystals from being blocked. The crystals can gradually enter the hose 21 under the vibration of the brush 19 and the filter plate 2 17. The dredging component 23 reduces the possibility of the crystals being blocked at the inlet of the hose 21. The crystals enter the liquid storage cavity of the rotating plate 18 through the hose 21, and then enter the cooling tank 3 3 through the delivery pipe 8 for final cooling and forming. The overall solution further improves the efficiency and quality of crystal forming.

[0039] like Figure 6 and Figure 8 As shown, the drive assembly 20 includes a bidirectional screw 201 and a motor three 202. The axis of the bidirectional screw 201 is parallel to the length direction of the stirring plate two 114. The end of the bidirectional screw 201 is rotatably set on the side wall of the stirring plate two 114 through a bearing. The brush plate of the brush 19 is fixedly connected with a connecting block 203. The bidirectional screw 201 is passed through and threadedly connected to the connecting block 203. The motor three 202 is fixedly installed on the side wall of the stirring plate two 114 by bolts, and the axis of the rotating shaft on the motor three 202 is parallel to the length direction of the stirring plate two 114. One end of the bidirectional screw 201 is fixed to the rotating shaft on the motor three 202 through a coupling.

[0040] like Figure 6 and Figure 8 As shown, the staff turns on motor three 202, which can drive the bidirectional screw 201 to rotate. The bidirectional screw 201 drives the brush 19 to move back and forth along the length direction of the filter plate on filter plate two 17 through the connecting block 203, thereby reducing the difficulty of moving the brush 19.

[0041] like Figure 6 and Figure 8As shown, the first vibration component 22 includes abutment blocks 221, a slide plate 222 and a vibration spring 223, and a plurality of top blocks 224 are fixedly connected to the side wall of the filter plate 217 along the movement direction of the brush 19; the abutment block 221 is fixedly connected to the brush plate of the brush 19, and the abutment block 221 is provided with an arc surface on the side close to the top block 224, and the abutment block 221 is slidably connected to the top block 224 through its arc surface; the slide plate 222 is fixedly connected to the side wall of the filter plate 217, and the slide plate 222 slides in the side wall of the stirring plate 214 along the width direction of the stirring plate 214; there are multiple vibration springs 223, and they are all arranged in the side wall of the stirring plate 214 along the width direction of the stirring plate 214, and the two ends of the vibration spring 223 are respectively fixed on the slide plate 222 and the inner wall of the stirring plate 214.

[0042] like Figure 6 and Figure 8 As shown, when the brush 19 moves, it drives the abutment block 221 to move at the same time. The abutment block 221 continuously pushes the top block 224 to move through its arc surface, and the top block 224 pushes the filter plate 2 17 to move. The filter plate 2 17 can move repeatedly under the action of the top block 224 and the vibration spring 223, thereby vibrating the crystal.

[0043] like Figure 6 and Figure 8 As shown, the dredging component 23 includes a waterwheel 231, a driving gear 1 232 and a driving gear 2 233. The end of the rotating shaft of the waterwheel 231 is rotatably set on the side wall of the stirring plate 2 114 through a bearing. The driving gear 1 232 is sleeved and fixed on the bidirectional screw 201. The driving gear 2 233 is sleeved and fixed on the rotating shaft on the waterwheel 231. The driving gear 2 233 is engaged with the driving gear 1 232.

[0044] like Figure 6 and Figure 8 As shown, when the bidirectional screw 201 rotates, it also drives the driving gear 1 232 to rotate, the driving gear 1 232 drives the driving gear 2 233 to rotate, and the driving gear 2 233 drives the waterwheel 231 to rotate. The wheels on the waterwheel 231 can continuously push and clear the accumulated crystals, thereby reducing the possibility of crystals accumulating at the inlet of the hose 21.

[0045] like Figure 4 、 Figure 6 and Figure 9As shown, the adjustment mechanism 13 includes a drive plate 131 vertically arranged in the cooling tank 2, the bottom end of the drive plate 131 is fixedly connected to the top of the rotating plate 18, and a sliding groove 132 is provided on the side of the drive plate 131 close to the inner wall of the cooling tank 2, the scraper 12 slides in the sliding groove 132, and an inclined groove 133 is provided at the top or bottom of the drive plate 131. The distance between the inclined groove 133 and the inner wall of the cooling tank 2 gradually increases from its starting point to its end point. The top or bottom of the scraper 12 is fixedly connected to a guide rod 134, and the guide rod 134 slides from the starting point of the inclined groove 133 to the end point of the inclined groove 133.

[0046] like Figure 4 、 Figure 6 and Figure 9 As shown, a reset assembly 24 for resetting the scraper 12 is provided in the sliding groove 132, and the reset assembly 24 includes a reset plate 241, a plurality of reset springs 242 and a plurality of reset springs 243. The reset plate 241 slides in the sliding groove 132 along the width direction of the driving plate 131. A plurality of slide rods 244 are fixedly connected to the side of the reset plate 241 close to the scraper 12. The axis of the slide rod 244 is parallel to the length direction of the driving plate 131. The plurality of reset springs 242 are arranged in a one-to-one correspondence with the plurality of slide rods 244. The reset spring 242 is sleeved on the slide rod 244 to reset the scraper 12. The two ends of spring 1 242 are respectively in contact with the reset plate 241 and the scraper 12, and the slide rod 1 244 passes through and is slidably connected to the side wall of the scraper 12; the inner wall of the driving plate 131 is fixedly connected with a plurality of slide rods 245, and the axis of the slide rod 245 is parallel to the width direction of the driving plate 131. The slide rod 245 passes through and is slidably connected to the reset plate 241, and the plurality of reset springs 243 and the plurality of slide rods 245 are arranged in a one-to-one correspondence. The reset spring 243 is sleeved on the slide rod 245, and the two ends of the reset spring 243 are respectively in contact with the reset plate 241 and the inner wall of the driving plate 131.

[0047] like Figure 4 、 Figure 6 and Figure 9As shown, the driving plate 131 drives the scraper 12 to rotate in the cooling tank 2 2, and the scraper 12 can slide in the sliding groove 132. When the scraper 12 contacts a thicker crystal, making it difficult to hang the crystal down, the scraper 12 continues to rotate, and the crystal can push the scraper 12 to move. At this time, the scraper 12 drives the guide rod 134 to slide along the inclined groove 133. Under the action of the inclined groove 133, the guide rod 134 drives the scraper 12 gradually away from the inner wall of the cooling tank 2 2. At this time, the reset plate 241 follows the scraper 12 to move along the width direction of the driving plate 131, and the reset spring 1 242 and the reset spring are both compressed. When the scraper 12 finishes working, the elastic force of the reset spring 1 242 and the reset spring 2 243 can push the scraper 12 to move to the initial position. The whole process ensures that the scraper 12 can effectively scrape off crystals of different thicknesses, improve the recovery rate of the crystals, and also reduce the possibility of damage to components in the equipment, thereby extending the service life of the equipment.

[0048] like Figure 5 and Figure 10 As shown, the side walls of the cooling tank three 3 are connected to two air inlet ducts 25, and a filter plate four 26 is installed at the connection between the air inlet duct 25 and the cooling tank three 3. A fan 27 is rotatably provided on the inner wall of the air inlet duct 25, and a fixing plate 28 is fixedly connected to the inner wall of the air inlet duct 25. The rotating shaft of the fan 27 is rotatably connected to the fixing plate 28. The air inlet duct 25 is located below the filter plate 14, and a placement plate 29 is fixedly connected to the outer wall of the cooling tank three 3. A motor four 30 is fixedly installed on the placement plate 29 by bolts, and a belt one 31 is provided between the rotating shaft on the motor four 30 and the rotating shaft of the fan 27, and the two are driven by the belt one 31; a belt two 32 is provided between the fans 27 in the two air inlet ducts 25, and the rotating shafts on the two fans 27 are driven by the belt two 32.

[0049] like Figure 5 and Figure 10As shown, the cooling tank 3 is provided with a second vibration assembly 33 for driving the filter plate 14 to vibrate, and the second vibration assembly 33 includes a driving rod 331 and a push rod 332; two driving rods 331 are horizontally provided, and are corresponding to the two fans 27, and the ends of the driving rods 331 are fixedly connected to the central axis of the fan 27, and the driving rod 331 is passed through the filter plate 26 to the cooling tank 3. A gear 333 is fixed on the driving rod 331, and two push rods 332 are provided, and are both vertically arranged in the cooling tank 3. The two push rods 332 are corresponding to the two gears 333. The push rod 33 The top of 2 is fixedly connected to the bottom of filter plate 14, and the bottom of the push rod 332 is provided with an arc surface. The bottom end of the push rod 332 can be inserted into the tooth groove on the gear 333, and the push rod 332 is slidably connected to the teeth on the gear 333 through its arc surface; the two ends of the filter plate 14 are slidably connected to the inner walls of the opposite sides of the cooling tank 3 3, and the inner walls below the two ends of the filter plate 14 in the cooling tank 3 3 are fixedly connected with support plates 334, and a plurality of buffer springs 335 are provided between the support plate 334 and the filter plate 14, and the two ends of the buffer spring 335 are respectively fixedly connected to the filter plate 3 and the support plate 334.

[0050] like Figure 5 and Figure 10 As shown, the staff can turn on the motor 4 30, which drives the two fans 27 to rotate through the belt 1 31 and the belt 2 32. The rotation of the fan 27 generates an airflow, which blows towards the filter plate 14 to assist in cooling the crystals and reduce friction. The filter plate 4 26 provided can filter impurities in the airflow to reduce the impact of impurities in the airflow on the quality of crystal formation. At the same time, when the fan 27 rotates, it can drive the drive rod 331 and the gear 333 to rotate. The teeth on the gear 333 can continuously push the push rod 332 and the filter plate 14 to move in the vertical direction through the curved surface on the push rod 332. The buffer spring 335 is continuously stretched and compressed, and the filter plate 14 vibrates as a result, which can help the crystals loosen and slide along the slide and finally be discharged through the outlet 15. The airflow provided by the fan 27 assists in cooling and reduces friction, which is conducive to the growth and sliding of the crystals and improves the collection efficiency of the crystals. Through the synergistic effect of airflow and vibration, high-quality collection of crystals is ensured, while reducing the residue of crystals on the filter plate, thereby improving the overall efficiency of the system.

[0051] The implementation principle of the embodiment of the present application is as follows: the condensation chambers on the inner wall of the cooling tank are interconnected to form a series cooling circuit, and the condensed liquid flows from the cooling tank three 3 in the liquid storage tank 61 through the circulation pump 62, flows through the cooling tank two 2 and the cooling tank one 1 in sequence through the circulation pipe 5, and then flows back to the liquid storage tank 61, and the temperature from the cooling tank three 3 to the cooling tank one 1 gradually increases; the solution enters from the inlet 7 of the cooling tank one 1, and undergoes preliminary cooling and crystallization in the cooling tank one 1. The solution after preliminary cooling enters the cooling tank two 2 through the delivery pipe 8, and continues to cool and crystallize. The first stirring component 10 and the second stirring component 11 are provided to promote solution mixing, and the scraper 12 rotates to scrape off the liquid on the inner wall of the cooling tank two 2 Crystals, at the same time, the scraper 12 can adjust the distance between the scraper 12 and the inner wall of the cooling tank 2 according to the thickness of the crystals on the inner wall of the cooling tank 2 under the action of the adjustment mechanism 13, so as to avoid the crystals from being broken due to excessive scraping, which helps to maintain the integrity of the crystals and improve the quality and purity of the crystals; finally, the solution enters the cooling tank 3 3 for final cooling and crystallization, the filter plate 1 14 intercepts the crystals, and the crystals are discharged through the outlet 15; the overall multi-stage cooling system improves the cooling efficiency and the quality of crystal growth, ensures the continuity and stability of the cooling process, avoids local overcooling or overheating, improves the purity and recovery rate of the crystals, and at the same time reduces the waste of mother liquor and improves resource utilization.

[0052] A three-stage cooling crystallization process comprises the following steps: S1. Solution preparation and injection: A solution of a certain concentration is prepared according to the desired crystal type and purity requirements, and pre-treated to remove impurities and adjust the pH value. The treated solution is injected into the cooling tank 1 through the inlet 7 of the cooling tank 1 to prepare for the cooling crystallization process; S2. Preliminary crystallization in cooling tank 1: Circulation assembly 6 is started to circulate the condensed liquid in the condensation chamber of cooling tank 1 to preliminarily cool the solution. Simultaneously, motor 102 is started to rotate stirring rod 101 and stirring plate 103 to promote uniform distribution of the solute. As the solution temperature decreases, the solute gradually reaches a supersaturated state and precipitates small crystal nuclei. These crystal nuclei gradually grow under the stirring action to form tiny crystals. S3. Crystal Growth in Cooling Tank 2: Open valve 9 of delivery pipe 8 between Cooling Tanks 1 and 2 to transfer the solution containing crystals into Cooling Tank 2. Continue cooling the solution by condensing the condensed liquid in the condensation chamber. Simultaneously, start motor 2 112 to rotate stirring rod 2 111 and stirring plate 2 114, further promoting crystal growth. Use scraper 12 to scrape off crystals on the inner wall of Cooling Tank 2 to ensure that the crystals can smoothly enter the solution and continue to grow. S4, final cooling and filtration in cooling tank three 3: Open valve 9 of delivery pipe 8 between cooling tank two 2 and cooling tank three 3 to deliver the solution containing crystals to cooling tank three 3; final cooling is performed by condensing the liquid in the condensation chamber, while filter plate one 14 intercepts larger crystal particles, while smaller crystals and mother liquor continue to circulate through the filter holes; S5. Crystal collection and discharge: The second vibration component 33 drives the filter plate 14 to vibrate, loosening the crystals and causing them to slide down the slideway; the fan 27 is started to blow the crystals up through the airflow and bring them to the outlet 15 of the cooling tank 3, and finally discharge them from the system, completing the crystal collection.

[0053] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A three-stage cooling crystallization system, characterized in that: The invention comprises cooling tank 1 (1), cooling tank 2 (2) and cooling tank 3 (3) which are arranged in sequence from top to bottom in the vertical direction. Condensation chambers for condensed liquid to circulate are provided in the inner walls of the shells of the three cooling tanks. The condensation chambers on the inner walls of the three cooling tanks are connected. A circulation component (6) for circulating condensed liquid is provided on one side of the three cooling tanks (1). Condensed liquid flows into the condensation chamber of the cooling tank 3 (3) and flows out of the condensation chamber of the cooling tank 1 (1). An inlet (7) for solution to enter is provided on the side wall of the cooling tank. A delivery pipe (8) for delivering solution is provided between two adjacent cooling tanks. The delivery pipe (8) ) is provided with a valve (9), and the inner cavities of the two adjacent cooling tanks are connected through the delivery pipe (8); a first stirring assembly (10) and a second stirring assembly (11) for stirring the solution are provided in the cooling tank one (1) and the cooling tank two (2), respectively; a scraper (12) for scraping off crystals on its inner wall is rotatably provided in the cooling tank two (2), and an adjusting mechanism (13) for adjusting the distance between the scraper (12) and its inner wall is also provided in the cooling tank two (2); a filter plate one (14) is obliquely provided in the cooling tank three (3), and an outlet (15) for discharging crystals is provided on the side wall of the cooling tank three (3).

2. A three-stage cooling crystallization system according to claim 1, characterized in that: The first stirring component (10) includes a stirring rod (101) and a motor (102), wherein the stirring rod (101) is rotatably arranged in the cooling tank (1), and a plurality of stirring plates (103) are fixedly arranged on the side wall of the stirring rod (101), and the motor (102) is installed on the outer wall of the cooling tank (1), and the end of the stirring rod (101) is fixedly arranged on the rotating shaft of the motor (102).

3. A three-stage cooling crystallization system according to claim 1, characterized in that: The second stirring component (11) includes a stirring rod (111) and a motor (112), wherein the stirring rod (111) is rotatably arranged in the cooling tank (2), and a plurality of stirring plates (114) are installed on the side wall of the stirring rod (111), and the motor (112) is installed on the outer wall of the cooling tank (2), and the end of the stirring rod (111) is installed on the rotating shaft of the motor (112).

4. A three-stage cooling crystallization system according to claim 3, characterized in that: The stirring rod 2 (111) rotates on the rotating shaft provided on the motor 2 (112), and a torsion spring 1 (113) is sleeved on the rotating shaft of the motor 2 (112), and the two ends of the torsion spring 1 (113) are respectively fixed on the rotating shaft on the motor 2 (112) and the side wall of the stirring rod 2 (111); a rotating rod 1 (115) is provided in the stirring rod 2 (111), and one end of the rotating rod 1 (115) is fixed on the rotating shaft on the motor 2 (112), and a rotating rod 2 (116) is fixed on the side wall of the stirring plate 2 (114). The second rotating rod (116) is rotatably arranged on the side wall of the second stirring rod (111), the first rotating rod (115) is fixedly provided with a bevel gear (333) 1 (117), the second rotating rod (116) is fixedly provided with a bevel gear (333) 2 (118), the first bevel gear (333) 1 (117) is meshed with the second bevel gear (333) 2 (118); the second rotating rod (116) is sleeved with a torsion spring (119), the two ends of the torsion spring (119) are respectively fixedly provided on the second stirring plate (114) and the second stirring rod (111).

5. A three-stage cooling crystallization system according to claim 4, characterized in that: A through hole (16) is provided in the side wall of the second stirring plate (114), and a second filter plate (17) is slidably provided in the through hole (16). A rotating plate (18) is fixedly provided on the second stirring rod (111), and a liquid storage cavity for storing a solution is provided in the rotating plate (18); a brush (19) is slidably provided in the through hole (16), and the brush (19) is composed of bristles and a brush plate. The bristles on the brush (19) are slidably fitted on the side wall of the second filter plate (17), and a driving component (20) for driving the brush (19) to move is provided on the second stirring plate (114); The side wall of the second stirring plate (114) is connected to a hose (21), and the two ends of the hose (21) are respectively connected to the liquid storage chamber in the perforation (16) and the rotating plate (18). The liquid storage chamber of the rotating plate (18) is connected to the inner cavity of the third cooling tank (3) through the delivery pipe (8) arranged between the second cooling tank (2) and the third cooling tank (3). The second stirring plate (114) is provided with a first vibration component (22) for driving the second filter plate (17) to vibrate, and the perforation (16) is also provided with a clearing component (23) for clearing crystals near the hose (21).

6. A three-stage cooling crystallization system according to claim 5, characterized in that: The driving assembly (20) includes a bidirectional screw (201) and a motor three (202), wherein the bidirectional screw (201) is rotatably arranged on the side wall of the stirring plate two (114), the brush plate thread on the brush (19) is engaged with the bidirectional screw (201), the motor three (202) is installed on the side wall of the stirring plate two (114), and one end of the bidirectional screw (201) is fixedly arranged on the rotating shaft of the motor three (202).

7. A three-stage cooling crystallization system according to claim 5, characterized in that: The first vibration component (22) includes a contact block (221), a slide plate (222) and a spring (223); a plurality of top blocks (224) are fixedly arranged on the side wall of the second filter plate (17) along the movement direction of the brush (19); the contact block (221) is fixedly arranged on the brush plate of the brush (19), and a curved surface is provided on the side of the contact block (221) close to the top block (224); the contact block (221) is slidably engaged with the top block (224) through its curved surface; the slide plate (222) is fixedly arranged on the side wall of the second filter plate (17), and the slide plate (222) slides in the side wall of the second stirring plate (114); the spring (223) is arranged in the side wall of the second stirring plate (114), and the two ends of the spring (223) are respectively fixedly arranged on the slide plate (222) and the inner wall of the second stirring plate (114).

8. A three-stage cooling crystallization system according to claim 5, characterized in that: The regulating mechanism (13) includes a driving plate (131) vertically arranged in the cooling tank 2 (2), one end of the driving plate (131) is fixedly arranged on the rotating plate (18), a sliding groove (132) is provided on the side of the driving plate (131) close to the inner wall of the cooling tank 2 (2), and the scraper (12) slides in the sliding groove (132), and an inclined groove (133) is provided on the top or bottom of the driving plate (131), and the distance between the inclined groove (133) and the inner wall of the cooling tank 2 (2) gradually increases from its starting point to its end point, and a guide rod (134) is fixedly arranged on the scraper (12), and the guide rod (134) slides from the starting point of the inclined groove (133) to the end point of the inclined groove (133), and a reset component (24) for resetting the scraper (12) is provided in the sliding groove (132).

9. A three-stage cooling crystallization system according to claim 1, characterized in that: The side wall of the cooling tank three (3) is connected to an air inlet pipe (25), a fan (27) is rotatably provided in the air inlet pipe (25), the air inlet pipe (25) is located below the filter plate one (14), the filter plate one (14) slides in the cooling tank three (3), and the cooling tank three (3) is provided with a second vibration component (33) for driving the filter plate one (14) to vibrate.

10. A three-stage cooling crystallization process, based on a three-stage cooling crystallization system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Solution preparation and injection: Prepare a solution of a certain concentration according to the required crystal type and purity requirements, and perform pretreatment to remove impurities and adjust the pH value. Inject the treated solution into the cooling tank (1) through the inlet (7) of the cooling tank (1) to prepare for the cooling crystallization process; S2. Preliminary crystallization in cooling tank 1 (1): start the circulation component (6) to circulate the condensed liquid in the condensation chamber of cooling tank 1 (1); at the same time, start motor 1 (102) to drive stirring rod 1 (101) and stirring plate 1 (103) to rotate; S3. Crystal growth in cooling tank 2 (2): Open the valve (9) of the delivery pipe (8) between cooling tank 1 (1) and cooling tank 2 (2) to deliver the solution containing crystals into cooling tank 2 (2); continue to cool the solution through the condensed liquid in the condensation chamber, and at the same time start motor 2 (112) to drive stirring rod 2 (111) and stirring plate 2 (114) to rotate; use scraper (12) to scrape off the crystals on the inner wall of cooling tank 2 (2); S4. Final cooling and filtration in cooling tank three (3): Open the valve (9) of the delivery pipe (8) between cooling tank two (2) and cooling tank three (3) to deliver the solution containing crystals to cooling tank three (3); perform final cooling through the condensed liquid in the condensation chamber, while the filter plate one (14) intercepts larger crystal particles, and smaller crystals and mother liquor continue to circulate through the filter holes; S5. Crystal collection and discharge: The second vibration component (33) drives the filter plate 1 (14) to vibrate, causing the crystals to loosen and slide down the slide; the fan (27) is started to blow the crystals up through the airflow and bring them to the outlet (15) of the cooling tank 3 (3), and finally discharge them from the system, completing the crystal collection.

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