Crystallization filtering device for pesticide production

Abstract

The utility model provides a crystallization filtering device for pesticide production, which belongs to the technical field of pesticide production equipment and comprises a crystallization tank body and a separation box body, and a filter screen plate is arranged in the separation box body; the crystallization tank body is provided with a heat exchange mechanism, and the heat exchange mechanism comprises a jacket and a heat exchange cylinder arranged in the crystallization tank body; the heat exchange cylinder and the crystallization tank body are coaxially arranged; the crystallization tank body is further provided with a stirring and scraping mechanism, the stirring and scraping mechanism comprises a motor, and the output end of the motor is connected with the rotating shaft; the rotating shaft penetrates through the heat exchange cylinder and is rotationally and hermetically connected with the heat exchange cylinder; a scraping assembly is arranged on the rotating shaft below the heat exchange cylinder and comprises two positioning rods, and the two positioning rods are connected with the rotating shaft through connecting rods; a scraping plate is arranged on each positioning rod and is respectively propped against the heat exchange cylinder and the crystallization tank body. The device integrates crystallization and filtration, so that the cooling efficiency and the crystallization efficiency of the device are improved, the cooling and stirring effects are considered, and crystals are not left and are easy to discharge.

Description

Technical Field

[0001] The utility model relates to the technical field of pesticide production equipment, in particular to a crystallization filtering device for pesticide production. Background Art

[0002] With the rapid development of the chemical industry, various pesticides have been invented and produced, and applied in various agricultural productions. Pesticides can protect crops, prevent them from being invaded by pests and diseases, and increase crop yields. Therefore, pesticides are widely produced and processed. In the synthesis and production of pesticides, usually a substance or a mixture of several substances and their preparations derived from biological, other natural products and applied biotechnology are chemically synthesized during the metabolism, growth, development and reproduction of harmful organisms, and finally dried and cooled into powder to obtain finished pesticides.

[0003] In the production of powdered pesticides, it is often necessary to crystallize and filter the pesticide slurry. The types of crystallization include heating crystallization and cooling crystallization. Among them, the cooling crystallization process is: first heat the solution, evaporate the solvent to form a saturated solution, then reduce the temperature of the hot saturated solution, and the solute whose solubility changes greatly with temperature will precipitate in the form of crystals. However, pesticides will release a lot of heat during the cooling crystallization process. Failure to dissipate heat in time will affect the cooling effect of the device. Most commonly used crystallization devices (such as crystallization kettles) only cool down by exchanging heat between the jacket and the kettle wall. The heat exchange area is small and the efficiency is low, which can easily cause insufficient crystallization of the crystallization kettle, resulting in the device having problems such as low heat transfer coefficient, poor heat dissipation effect, low cooling efficiency, and low crystallization efficiency. If a spiral tube is set inside the crystallization device as a channel for the refrigerant, stirring and cooling cannot be carried out simultaneously, affecting the heat exchange between the pesticide materials. There are also problems such as uneven cooling crystallization and reduced crystallization efficiency. In addition, the crystals will also adhere to the spiral tube wall, and the cleaning work is relatively cumbersome, which will also affect the product yield. At the same time, most crystallization devices do not have a filtering function, and the load of the filtering device for separating the liquid phase solvent and the crystal is large, which affects the production efficiency. Utility Model Content

[0004] In order to improve the cooling efficiency and crystallization efficiency of the device, to give consideration to both cooling and stirring effects, to make crystals easy to discharge without residue, and to integrate crystallization and filtration, the utility model provides a crystallization filtration device for pesticide production.

[0005] Specifically, the utility model provides a crystallization filtration device for pesticide production, including: a crystallization tank body and a separation box body, a crystallization liquid outlet is provided at the bottom center of the crystallization tank body, and the crystallization liquid outlet is connected to the crystallization liquid inlet provided at the top of the separation box body; a material inlet is provided on one side of the top of the crystallization tank body; a filter plate is provided in the separation box body, a crystallization outlet is provided on one side of the separation box body above the filter plate, and a solvent outlet is provided on one side of the bottom of the separation box body.

[0006] Optionally, the crystallization tank body is provided with a heat exchange mechanism, which includes a jacket arranged on the outer wall of the crystallization tank body and a heat exchange cylinder arranged inside the crystallization tank body; the jacket is symmetrically provided with a jacket inlet and a jacket outlet; the heat exchange cylinder is coaxially arranged with the crystallization tank body, and the top of the side wall of the heat exchange cylinder is sealed and connected to the inner wall of the crystallization tank body; a cylinder inlet and a cylinder outlet are symmetrically opened on the top of the crystallization tank body, both the cylinder inlet and the cylinder outlet are connected to the heat exchange cylinder, and a baffle extending to the middle of the heat exchange cylinder is provided between the cylinder inlet and the cylinder outlet, and the baffle divides the heat exchange cylinder into two connected chambers.

[0007] Optionally, the crystallization tank body is also provided with a scraping mechanism, which includes a motor arranged at the top center of the crystallization tank body, and the output end of the motor is connected to a rotating shaft arranged inside the crystallization tank body and passing through the crystallization tank body; the rotating shaft passes through the heat exchange tube and is rotatably sealed with the heat exchange tube; at least one scraper assembly is arranged on the rotating shaft below the heat exchange tube, and the scraper assembly includes two positioning rods, and the two positioning rods are connected to the rotating shaft through the same connecting rod; each positioning rod is provided with a scraper, and the scraper is respectively abutted against the outer wall of the heat exchange tube and the inner wall of the crystallization tank body.

[0008] Optionally, a liquid guide tube is provided inside the heat exchange tube, one end of the liquid guide tube is connected to the tube inlet, and the other end of the liquid guide tube extends to the lower part of the inner cavity of the heat exchange tube.

[0009] Optionally, a plurality of stirring rods are provided on the sides of the two positioning rods of the same scraper assembly that are close to each other, and the plurality of stirring rods are arranged in a staggered manner.

[0010] Optionally, an anti-blocking mechanism is connected to the bottom of the rotating shaft, and the anti-blocking mechanism includes a plurality of scraping rods connected to the bottom of the rotating shaft, and the scraping rods are in sliding contact with the bottom wall of the crystallization tank body.

[0011] Optionally, the anti-blocking mechanism further includes a disturbance blade, which is disposed above the scraper rod close to the rotating shaft, the disturbance blade is fixedly connected to the upper surface of the scraper rod, and the disturbance blade is installed at an angle.

[0012] Optionally, a temperature detector is provided in the crystallization tank body, and the temperature detector is electrically connected to the controller; the controller is also connected to a barrel inlet control valve and a jacket inlet control valve, the barrel inlet control valve is arranged on the pipeline connected to the barrel inlet, and the jacket inlet control valve is arranged on the pipeline connected to the jacket inlet.

[0013] Optionally, the filter plate in the separation box is arranged at an angle, and the crystallization liquid inlet is arranged on the side close to the inclined high end of the filter plate; a concave crystallization storage tank is provided in the middle of the separation box, and the top of one side wall of the crystallization storage tank is connected to the inclined low end of the filter plate, and the other side wall is sealed with the inner wall of the separation box; the crystallization outlet is opened at one end of the crystallization storage tank along the length direction.

[0014] Optionally, a clearing mechanism is provided in the crystallization storage tank, which includes a pushing cylinder installed on the outside of the crystallization box, and the movable end of the pushing cylinder is connected to a pushing piston through a piston column; the piston column penetrates the side wall of the crystallization box and extends along the length direction of the crystallization storage tank; the pushing piston abuts against the inner side wall and bottom wall of the crystallization storage tank; the pushing cylinder is arranged on the side away from the crystallization outlet.

[0015] The crystallization and filtering device for pesticide production provided by the utility model integrates crystallization and filtering devices into one, has a simple structure, has high cooling efficiency of the crystallization tank body, has good crystallization effect, can reduce raw material consumption, and improve the recovery efficiency of product crystals. The separation box body realizes the preliminary filtering and separation of the crystallized materials, reduces the load and energy consumption of the subsequent filtering device, and can also simplify the re-filtration step according to the production situation, saving the cost of the filtering device, which is conducive to industrial production.

[0016] The crystallization tank of the device utilizes a jacket and a heat exchange cylinder to achieve the purpose of heating or cooling the material from the surface and inside of the crystallization tank at the same time, and utilizes a scraping mechanism to scrape off the crystals attached to the inner wall of the crystallization tank and the outer wall of the heat exchange cylinder, thereby avoiding the influence of heat transfer and reduction of crystal yield after material attachment. The scraping mechanism also has a stirring function, realizing stirring and condensation at the same time, thereby improving heat exchange efficiency, heat transfer effect, crystallization efficiency and product yield.

[0017] The crystallization tank of the device uses an anti-blocking mechanism to scrape off the crystals attached to the bottom wall of the crystallization tank, and at the same time, it can also improve the intensity and efficiency of stirring, break up the crystals near the crystallization liquid outlet, effectively avoid the situation where the crystal agglomerates block the crystallization liquid outlet, and ensure the normal discharge of the crystallization tank. The device can also regulate the crystallization temperature, reduce the temperature fluctuation during the crystallization process, and also avoid the situation where impurities are crystallized due to excessive cooling, so as to solve the problem of incomplete crystallization or impurities mixed in the crystallization caused by temperature fluctuations.

[0018] The separation box of the device uses an inclined filter plate to accelerate the separation rate of the solvent and the crystal, and uses a material clearing mechanism to timely push the crystals obtained from the crystallization outlet to achieve automatic discharging, and it is not easy for product crystals to accumulate. The crystallization filtration device is not limited to use in pesticide production, and can also be applied to other fields with the same / similar processes and technical purposes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a crystallization filtration device for pesticide production provided by one embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the structure of a crystallization tank provided in one embodiment of the utility model;

[0022] Figure 3 A schematic diagram of a sectional three-dimensional structure of a separation box provided in one embodiment of the utility model;

[0023] Figure 4 This is a schematic side structural diagram of a separation box provided in one embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1. Crystallization tank body, 2. Separation box body, 3. Controller, 11. Crystallization liquid outlet, 12. Material inlet, 13. Jacket, 14. Heat exchange cylinder, 15. Temperature detector, 21. Crystallization liquid inlet, 22. Filter plate, 23. Crystallization outlet, 24. Solvent outlet, 25. Crystallization storage tank, 131. Jacket inlet, 132. Jacket outlet, 133. Jacket inlet control valve, 141. Cylinder inlet, 142. Cylinder outlet, 143. Baffle, 144. Liquid guide tube, 145. Cylinder inlet control valve, 161. Motor, 162. Rotating shaft, 163. Positioning rod, 164. Connecting rod, 165. Scraper, 166. Stirring rod, 171. Scraper rod, 172. Disturbance blade, 261. Pushing cylinder, 262. Piston column, 263. Pushing piston. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the utility model.

[0027] like Figure 1 The utility model provides a crystallization filtration device for pesticide production, comprising: a crystallization tank body 1 and a separation box body 2, a crystallization liquid outlet 11 is provided at the bottom center of the crystallization tank body 1, and the crystallization liquid outlet 11 is connected to a crystallization liquid inlet 21 provided at the top of the separation box body 2; a material inlet 12 is provided at one side of the top of the crystallization tank body 1; a filter plate 22 is provided in the separation box body 2, a crystallization outlet 23 is provided at one side of the separation box body 2 above the filter plate 22, and a solvent outlet 24 is provided at one side of the bottom of the separation box body 2.

[0028] The material inlet 12 is used to feed the material to be crystallized and process water for crystallization into the crystallization tank body 1. The material can be fed in one go or added dropwise. After the material to be crystallized is cooled and crystallized in the crystallization tank body 1, the crystallization liquid containing the crystal is fed into the separation box 2 from the crystallization liquid inlet 21, and the filter plate 22 is used for preliminary solid-liquid separation. The solvent is collected in the separation box 2 below the filter plate 22, and discharged and recovered through the solvent outlet 24. The crystals are left above the filter plate 22 and discharged to the next process through the crystal outlet, thereby achieving preliminary filtration and separation of the crystallization material, reducing the load of the subsequent filtration device, and simplifying the re-filtration step according to the production situation, saving the cost of the filtration device.

[0029] like Figure 1 and Figure 2 Optionally, the crystallization tank body 1 is provided with a heat exchange mechanism, which includes a jacket 13 arranged on the outer wall of the crystallization tank body 1 and a heat exchange cylinder 14 arranged inside the crystallization tank body 1; the jacket 13 is symmetrically provided with a jacket inlet 131 and a jacket outlet 132; the heat exchange cylinder 14 is coaxially arranged with the crystallization tank body 1, and the top of the side wall of the heat exchange cylinder 14 is sealed and connected to the inner wall of the crystallization tank body 1; the top of the crystallization tank body 1 is symmetrically provided with a cylinder inlet 141 and a cylinder outlet 142, both of which are connected to the heat exchange cylinder 14, and a baffle 143 extending to the middle of the heat exchange cylinder 14 is provided between the cylinder inlet 141 and the cylinder outlet 142, and the baffle 143 divides the heat exchange cylinder 14 into two connected chambers.

[0030] During crystallization, the jacket 13 and the heat exchange cylinder 14 can first be introduced with a heat medium according to the working conditions, and after the material to be crystallized is heated to a supersaturated state, a refrigerant is introduced into the jacket 13 and the heat exchange cylinder 14 to achieve cooling and crystallization of the material. After the heat medium or refrigerant is injected into the jacket 13 and the heat exchange cylinder 14, the material can be heated or cooled from the surface and the inside of the crystallization tank body 1 at the same time, thereby improving the heat exchange efficiency and heat transfer effect of the material. The refrigerant is such as water, water-ethanol solution, water-ethylene glycol solution, etc., and the heat medium is such as water, water vapor, etc., and its specific composition is conventionally selected according to the heating / cooling range, and the heat medium / refrigerant can be recycled.

[0031] like Figure 2Optionally, the crystallization tank body 1 is also provided with a scraping mechanism, which includes a motor 161 arranged at the top center of the crystallization tank body 1, and the output end of the motor 161 is connected to a rotating shaft 162 arranged inside the crystallization tank body 1 and penetrating the crystallization tank body 1; the rotating shaft 162 penetrates the heat exchange tube 14 and is rotatably sealed and connected to the heat exchange tube 14; at least one scraper assembly is arranged on the rotating shaft 162 below the heat exchange tube 14, and the scraper assembly includes two positioning rods 163, and the two positioning rods 163 are connected to the rotating shaft 162 through the same connecting rod 164; each positioning rod 163 is provided with a scraper 165, and the scraper 165 is respectively abutted against the outer wall of the heat exchange tube 14 and the inner wall of the crystallization tank body 1.

[0032] When the scraping mechanism is working, the motor 161 drives the rotating shaft 162, and then drives the positioning rod 163 of the scraping assembly to rotate. The scraper 165 on the positioning rod 163 scrapes off the crystals attached to the inner wall of the crystallization tank body 1 and the outer wall of the heat exchange cylinder 14, avoiding the influence of heat transfer and the reduction of crystal yield after the material is attached, thereby improving the heat exchange efficiency, crystallization efficiency and product yield. The scraping mechanism also has a stirring function, which can realize stirring and condensation at the same time, making the heat exchange of materials more uniform and improving production efficiency. It should be noted that the baffle 143 can be set at a position deviating from the center of the heat exchange cylinder 14, so that the rotating shaft 162 does not contact the baffle 143.

[0033] like Figure 2 Optionally, a liquid guide tube 144 is provided inside the heat exchange tube 14, one end of which is connected to the tube inlet 141, and the other end of which extends to the lower part of the inner cavity of the heat exchange tube 14. The liquid guide tube 144 can directly guide the heat medium / refrigerant delivered by the tube inlet 141 to the lower part of the heat exchange tube 14, so that the residence time and flow path of the heat medium / refrigerant in the heat exchange tube 14 are prolonged, thereby achieving a better heat exchange effect of the heat exchange tube 14.

[0034] like Figure 2 Optionally, a plurality of stirring rods 166 are disposed on the side where the two positioning rods 163 of the same scraper assembly are close to each other, and the plurality of stirring rods 166 are arranged in a staggered manner. The shape of the stirring rod 166 is not limited. When the positioning rod 163 rotates with the rotating shaft 162, the stirring rod 166 rotates accordingly, thereby stirring the material between the two positioning rods 163, increasing the flow speed of the material in the crystallization kettle, which is beneficial to improving the stirring effect and heat exchange efficiency of the material, and can also accelerate the cooling rate and crystallization rate of the material.

[0035] like Figure 2Optionally, an anti-blocking mechanism is connected to the bottom of the rotating shaft 162, and the anti-blocking mechanism includes a plurality of scraping rods 171 connected to the bottom of the rotating shaft 162, and the scraping rods 171 are in sliding contact with the bottom wall of the crystallization tank body 1. When working, when the rotating shaft 162 drives the scraping rods 171 to rotate, the crystals attached to the bottom wall of the crystallization tank body 1 can be scraped off, and the crystals near the crystallization liquid outlet 11 can also be scattered, effectively avoiding the situation where the crystal agglomeration blocks the crystallization liquid outlet 11.

[0036] like Figure 2 Optionally, the anti-blocking mechanism further includes a disturbance blade 172, which is disposed above the scraper rod 171 near the rotating shaft 162, and the disturbance blade 172 is fixedly connected to the upper surface of the scraper rod 171, and the disturbance blade 172 is installed obliquely. The shape of the disturbance blade 172 is not limited, such as a diamond, a square or other irregular shapes.

[0037] When the scraper 171 rotates, the disturbance blade 172 is driven to rotate, so that the material at the bottom of the rotating shaft 162 and near the crystallization liquid outlet 11 is driven, and the obliquely installed disturbance blade 172 can improve the intensity and efficiency of stirring, thereby achieving the purpose of increasing the movement rate and fluidity of the precipitated crystals therein, thereby avoiding the blockage of crystals near the crystallization liquid outlet 11 and improving the discharge efficiency of the crystallization liquid. At the same time, when the disturbance blade 172 rotates, it can also break up large pieces of crystals to prevent the blockage caused by the crystals that are agglomerated during the discharge, thereby avoiding the blockage of the crystallization liquid outlet 11 due to the accumulation of crystals, and ensuring the normal discharge of the crystallization tank body 1.

[0038] In order to better control the crystallization temperature fluctuation, such as Figure 1 Optionally, a temperature detector 15 is provided in the crystallization tank body 1, and the temperature detector 15 is electrically connected to the controller 3; the controller 3 is also connected to a barrel inlet control valve 145 and a jacket inlet control valve 133, the barrel inlet control valve 145 is arranged on the pipeline connected to the barrel inlet 141, and the jacket inlet control valve 133 is arranged on the pipeline connected to the jacket inlet 131.

[0039] The temperature detector 15 is used to detect the temperature of the material in the crystallization tank body 1 in real time, and the controller 3 is used to timely adjust the flow rate of the refrigerant entering the jacket 13 and the heat exchange cylinder 14, so as to keep the temperature of the material stable during the crystal formation process and reduce the temperature fluctuation during the crystallization process. At the same time, it can also avoid the crystallization of impurities caused by excessive cooling, so as to solve the problem of incomplete crystallization or impurities mixed in the crystallization caused by temperature fluctuations.

[0040] like Figure 3 and Figure 4Optionally, the filter plate 22 in the separation box 2 is arranged at an angle, and the crystallization liquid inlet 21 is arranged on the side close to the inclined high end of the filter plate 22; a concave crystallization storage tank 25 is provided in the middle of the separation box 2, and the top of one side wall of the crystallization storage tank 25 is connected to the inclined low end of the filter plate 22, and the other side wall is sealed and connected to the inner wall of the separation box 2; the crystallization outlet 23 is opened at one side end of the crystallization storage tank 25 along the length direction.

[0041] The filter plate 22 is arranged at an angle, and the crystallization liquid inlet 21 is arranged on the side close to the inclined high end of the filter plate 22. The continuously entering crystallization material impacts the crystals remaining on the filter plate 22, prompting the crystals to move downward along the inclined direction of the filter plate 22, thereby collecting them in the crystal storage tank 25, facilitating the separation and collection of the crystals and accelerating the separation rate of the solvent and the crystals. A similar solvent outlet 24 is used for solvent discharge, and its position is not limited, and it can be arranged on the lower side wall of the separation box 2.

[0042] In order to prevent the crystals from accumulating in the crystallization storage tank 25, as Figure 4 Optionally, a clearing mechanism is provided in the crystallization storage tank 25, and the clearing mechanism includes a push cylinder 261 installed outside the crystallization box, and the movable end of the push cylinder 261 is connected to a push piston 263 through a piston column 262; the piston column 262 penetrates the side wall of the crystallization box and extends along the length direction of the crystallization storage tank 25; the push piston 263 abuts against the inner side wall and the bottom wall of the crystallization storage tank 25; the push cylinder 261 is arranged on the side away from the crystallization outlet 23. The push cylinder 261 is used to make the push piston 263 perform a reciprocating motion of pushing out and retracting along the length direction of the crystallization storage tank 25, so that the crystals obtained by crystallization are pushed out from the crystallization outlet 23 in time, realizing automatic discharging, and it is not easy to cause the accumulation of product crystals.

[0043] The utility model takes the production of the pesticide-amide contact herbicide propanil as an example. After 3,4-dichloroaniline and propionyl chloride are used to carry out a condensation reaction to synthesize propanil, the solvent toluene is evaporated by distillation, and the material needs to be cooled and crystallized. The crystallization process is as follows: add measured process water to the crystallization filter device, heat it to 75-85°C, drop the material to be crystallized at this temperature, keep it warm for 10 minutes after the drop is completed, and then slowly cool it to 20-30°C, filter it, and rinse the filter cake with process water to obtain a wet material. Finally, the wet material is dried at 65-75°C to obtain the finished product propanil.

[0044] In this embodiment, the crystallization filtration device for pesticide production is operated in the following process: process water is fed into the crystallization tank body 1 through the material inlet 12, and heat medium is introduced into the jacket 13 and the heat exchange cylinder 14 to increase the temperature. After the temperature detector 15 detects that the process water temperature reaches 75-85°C, the material to be crystallized is fed into the material inlet 12, and then the motor 161 is started to drive the rotating shaft 162 and the connecting rod 164, the positioning rod 163, and the stirring rod 166 to rotate, and the materials in the crystallization tank body 1 are mixed. At the same time, after the heat medium is used to keep warm for 10 minutes, the heat medium in the jacket 13 and the heat exchange cylinder 14 is completely discharged. Then, the cold medium is introduced into the jacket 13 and the heat exchange cylinder 14 to reduce the temperature. The liquid guide pipe 144 can directly guide the hot medium / cold medium introduced into the cylinder inlet 141 into the lower part of the heat exchange cylinder 14, so that the residence time and flow path of the hot medium / cold medium in the heat exchange cylinder 14 become longer, thereby making the heat exchange effect of the heat exchange cylinder 14 better. During the heating and cooling period, the temperature detector 15 is used to detect the temperature of the material in the crystallization tank body 1 in real time, and the controller 3 is used to timely adjust the flow of the barrel inlet control valve 145 and the jacket inlet control valve 133, so as to keep the temperature of the material stable during the crystallization process.

[0045] During the cooling crystallization process, the scraper 165 on the positioning rod 163 rotating with the rotating shaft 162 scrapes off the crystals attached to the inner wall of the crystallization tank body 1 and the outer wall of the heat exchange cylinder 14, and the stirring action of the stirring blades thereon accelerates the efficiency of heat transfer of the material mixer. The scraper 171 rotating with the rotating shaft 162 can scrape off the crystals attached to the bottom wall of the crystallization tank body 1, and at the same time, it can also break up the crystals near the crystallization liquid outlet 11, effectively avoiding the situation where the crystal agglomerates block the crystallization liquid outlet 11. When discharging after the crystallization is completed, when the rotating shaft 162 drives the scraper 171 to rotate, it drives the disturbance blade 172 to rotate, so that the materials at the bottom of the rotating shaft 162 and near the crystallization liquid outlet 11 are driven, which intensifies the purpose of the movement rate and fluidity of the precipitated crystals, and can also break up large pieces of crystals to prevent the crystals from forming blockages when the materials are discharged, thereby avoiding the problem of blockage of the crystallization liquid outlet 11 caused by crystal accumulation, and ensuring the normal discharging of the crystallization tank body 1.

[0046] The crystallization liquid containing crystals is fed into the separation box 2 from the crystallization liquid inlet 21, and the solid-liquid preliminary separation is carried out using the filter plate 22. The crystallization liquid inlet 21 is arranged on the side close to the inclined high end of the filter plate 22. The continuously entering crystallization material impacts the crystals remaining on the filter plate 22, causing the crystals to move downward along the inclined direction of the filter plate 22, thereby collecting them in the crystallization storage tank 25. The solvent is collected in the separation box 2 below the filter plate 22 and discharged and recovered through the solvent outlet 24.

[0047] When the crystals in the crystallization storage tank 25 are discharged, the pushing cylinder 261 is used to make the pushing piston 263 perform a reciprocating motion of pushing out and retracting along the length direction of the crystallization storage tank 25, so that the crystals obtained by crystallization are pushed out from the crystallization outlet 23 in time, realizing automatic discharge and preventing product crystal accumulation from occurring.

[0048] It should be noted that in the present invention, the detailed structure of some devices is not described in detail, but belongs to the prior art known to those skilled in the art, so it will not be repeated here. In addition, the parts not involved in the device are the same as the prior art or can be implemented by the prior art.

[0049] It should be noted that pressure sensors, flow meters or temperature sensors are installed on the delivery pipelines inside the device between different units and equipment. Different valves are also installed, such as pressure relief valves, pressure regulating valves, safety valves, etc., which are used to adjust and stabilize the pressure of the entire device.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A crystallization filtration device for pesticide production, characterized in that: include: A crystallization tank body and a separation box body, wherein a crystallization liquid outlet is provided at the bottom center of the crystallization tank body, and the crystallization liquid outlet is connected to a crystallization liquid inlet provided at the top of the separation box body; a material inlet is provided on one side of the top of the crystallization tank body; a filter plate is provided in the separation box body, a crystallization outlet is provided on one side of the separation box body above the filter plate, and a solvent outlet is provided on one side of the bottom of the separation box body; The crystallization tank body is provided with a heat exchange mechanism, and the heat exchange mechanism includes a jacket arranged on the outer wall of the crystallization tank body and a heat exchange cylinder arranged inside the crystallization tank body; the jacket is symmetrically provided with a jacket inlet and a jacket outlet; the heat exchange cylinder is coaxially arranged with the crystallization tank body, and the top of the side wall of the heat exchange cylinder is sealed and connected with the inner wall of the crystallization tank body; the top of the crystallization tank body is symmetrically provided with a cylinder inlet and a cylinder outlet, and the cylinder inlet and the cylinder outlet are both communicated with the heat exchange cylinder, and a baffle extending to the middle of the heat exchange cylinder is provided between the cylinder inlet and the cylinder outlet, and the baffle divides the heat exchange cylinder into two communicated chambers; The crystallization tank body is also provided with a scraping mechanism, which includes a motor arranged at the top center of the crystallization tank body, and the output end of the motor is connected to a rotating shaft arranged inside the crystallization tank body and passing through the crystallization tank body; the rotating shaft passes through the heat exchange cylinder and is rotatably sealed and connected to the heat exchange cylinder; at least one scraper assembly is arranged on the rotating shaft below the heat exchange cylinder, and the scraper assembly includes two positioning rods, and the two positioning rods are connected to the rotating shaft through the same connecting rod; each of the positioning rods is provided with a scraper, and the scraper is respectively abutted against the outer wall of the heat exchange cylinder and the inner wall of the crystallization tank body.

2. The crystallization filtration device for pesticide production according to claim 1, characterized in that: A liquid guide tube is provided inside the heat exchange tube, one end of the liquid guide tube is connected to the tube inlet, and the other end of the liquid guide tube extends to the lower part of the inner cavity of the heat exchange tube.

3. The crystallization filtration device for pesticide production according to claim 1, characterized in that: A plurality of stirring rods are arranged on the sides of the two positioning rods of the same scraper assembly that are close to each other, and the plurality of stirring rods are arranged in a staggered manner.

4. The crystallization filtration device for pesticide production according to claim 1, characterized in that: The bottom of the rotating shaft is connected with an anti-blocking mechanism, which includes a plurality of scraping rods connected to the bottom of the rotating shaft, and the scraping rods are in sliding contact with the bottom wall of the crystallization tank body.

5. The crystallization filtration device for pesticide production according to claim 4, characterized in that: The anti-blocking mechanism further comprises a disturbance blade, which is arranged above the scraper rod close to the rotating shaft, the disturbance blade is fixedly connected to the upper surface of the scraper rod, and the disturbance blade is installed obliquely.

6. The crystallization filtration device for pesticide production according to claim 1, characterized in that: A temperature detector is provided in the crystallization tank body, and the temperature detector is electrically connected to the controller; the controller is also connected to a barrel inlet control valve and a jacket inlet control valve, the barrel inlet control valve is provided on the pipeline connected to the barrel inlet, and the jacket inlet control valve is provided on the pipeline connected to the jacket inlet.

7. The crystallization filtration device for pesticide production according to any one of claims 1 to 6, characterized in that: The filter plate in the separation box is arranged at an angle, and the crystallization liquid inlet is arranged on a side close to the inclined high end of the filter plate; a concave crystallization storage tank is provided in the middle of the separation box, and the top of one side wall of the crystallization storage tank is connected to the inclined low end of the filter plate, and the other side wall is sealed and connected to the inner wall of the separation box; the crystallization outlet is opened at one side end of the crystallization storage tank along the length direction.

8. The crystallization filtration device for pesticide production according to claim 7, characterized in that: A material clearing mechanism is provided in the crystallization storage tank, and the material clearing mechanism includes a pushing cylinder installed on the outside of the crystallization box, and the movable end of the pushing cylinder is connected to a pushing piston through a piston column; the piston column penetrates the side wall of the crystallization box and extends along the length direction of the crystallization storage tank; the pushing piston abuts against the inner side wall and bottom wall of the crystallization storage tank; the pushing cylinder is arranged on the side away from the crystallization outlet.

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