A vacuum belt filter for the synthesis of methyl thiophanate

Abstract

This invention discloses a vacuum belt filter for synthesizing methyl thiophanate, comprising a drive frame, a circulating filter belt, and a storage tank. The circulating filter belt is mounted on the drive frame, which drives the filter belt to circulate. A vacuum suction box is located on the inner side of the circulating filter belt. The storage tank is connected to the vacuum suction box via an inlet pipe. The vacuum suction box is maintained at a low pressure by a vacuum pump. The storage tank is connected to a liquid pump via an outlet pipe to transport the liquid. One end of the circulating filter belt is a feeding area, and the other end is a discharge area. A filter cake collection box is located on the side of the circulating filter belt near the discharge area. The filter cake collection box contains a filter cake scraping mechanism and a filter cake discharge mechanism. The vacuum belt filter for synthesizing methyl thiophanate of this invention has many advantages, including high filtration efficiency, good filter cake scraping effect, strong cleaning function, efficient filter residue discharge, and stable and reliable operation.

Description

Technical Field

[0001] This invention relates to the field of methyl thiophanate synthesis technology, and in particular to a vacuum belt filter for synthesizing methyl thiophanate. Background Technology

[0002] Thiophanate-methyl, chemical formula C 12 H 14 N4O4S2 is a broad-spectrum, systemic, low-toxicity fungicide with systemic, preventative, and curative effects. It was originally developed by Nippon Soda Co., Ltd., and is effective in controlling diseases in a variety of crops.

[0003] In the process of synthesizing methyl thiophanate, sodium thiocyanate and o-phenylenediamine as raw materials in a certain ratio in the presence of ethyl acetate solvent and catalyst, the crude wet methyl thiophanate still contains a small amount of unreacted reactants and solvent impurities. Therefore, the crude wet product needs to be filtered and washed with water, which requires the use of a vacuum belt filter.

[0004] Existing vacuum belt filters typically employ a single scraper structure, which easily leads to filter cake residue, resulting in unsatisfactory scraping performance. Furthermore, the filter cake tends to accumulate on the scraper surface, affecting subsequent scraping operations. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides a vacuum belt filter for synthesizing methyl thiophanate.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A vacuum belt filter for synthesizing thiophanate-methyl includes a drive frame, a circulating filter belt, and a storage tank. The circulating filter belt is mounted on the drive frame, which drives the circulating filter belt to move cyclically. A vacuum suction box is provided on the inner side of the circulating filter belt. The storage tank is connected to the vacuum suction box through an inlet pipe. The vacuum suction box is maintained at a low pressure by a vacuum pump. The storage tank is connected to a liquid pump through an outlet pipe to transport the liquid away. One end of the circulating filter belt is a feeding area, and the other end is a discharge area. A filter cake collection box is provided on the side of the circulating filter belt near the discharge area.

[0008] The filter cake collection box is equipped with a filter cake scraping mechanism and a filter cake discharge mechanism;

[0009] A washing nozzle is located on the side of the drive frame near the filter cake collection box.

[0010] Preferably, the filter cake scraping mechanism includes a first scraper, the filter cake collection box is an open design, and a horizontal slide rail is provided on the inner wall of the filter cake collection box. The first scraper is slidably mounted on the horizontal slide rail by a slider, and can move horizontally inside the filter cake collection box. The circulating filter belt moves through the filter cake collection box.

[0011] Preferably, there are four first scrapers, which are equidistantly distributed from top to bottom. Four second scrapers are fixed on the inner wall of the filter cake collection box. The second scrapers correspond one-to-one with the first scrapers, and the bottom end of the second scraper is in contact with the top surface of the first scraper.

[0012] Preferably, the filter cake collection box is provided with a scraper driving mechanism, which includes a first rack, a second rack, a third rack and a fourth rack, and is fixed to the four first scrapers in sequence. A first transmission gear is provided between the first rack and the second rack, and a second transmission gear is provided between the third rack and the fourth rack.

[0013] Preferably, the first rack and the second rack both mesh with the first transmission gear, and the third rack and the fourth rack both mesh with the second transmission gear.

[0014] Preferably, a drive bar is fixed between the second rack and the fourth rack, and a reciprocating screw is rotatably mounted on the outer wall of the filter cake collection box. The reciprocating screw passes through the drive bar through a threaded hole and is driven to rotate by a first rotary motor.

[0015] Preferably, the filter cake collection box is equipped with a scraper rinsing mechanism, which includes a cleaning liquid inlet pipe and multiple cleaning nozzles connected to the cleaning liquid inlet pipe, with each cleaning nozzle corresponding to a first scraper.

[0016] Preferably, the filter cake discharge mechanism includes a discharge screw, which is rotatably installed inside the filter cake collection box near the bottom. The discharge screw is driven to rotate by a second rotary motor. A discharge port is provided on one side of the filter cake collection box, and the discharge screw extends to the outside of the filter cake collection box through the discharge port.

[0017] Preferably, a pressure plate is elastically installed inside the filter cake collection box, and the pressure plate is arranged parallel to the circulating filter belt.

[0018] Preferably, a guide rod is provided on the side of the pressure plate away from the first scraper. The guide rod passes through the side wall of the filter cake collection box through a guide hole and is connected to a limiting component. A spring is sleeved on the outer side of the guide rod.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This equipment utilizes the combination of a vacuum suction box and a circulating filter belt to accelerate the filtration process using air pressure difference, achieving efficient pressure filtration of wet materials during the synthesis of methyl thiophanate. Multiple sets of vacuum suction boxes and storage tanks are equidistantly distributed, further improving filtration efficiency. Washing nozzles spray 60-80℃ hot water to wash the filter cake, effectively removing impurities and improving the purity of the final methyl thiophanate product.

[0021] 2. The coordinated design of the first and second scrapers prevents the filter cake from accumulating on the surface of the first scraper, thus improving the filter cake removal effect. The four first scrapers are evenly distributed from top to bottom and correspond one-to-one with the four second scrapers, ensuring the thorough removal of the filter cake. The scraper drive mechanism drives the reciprocating screw through the first rotary motor, which drives the rack and transmission gear to move, realizing the horizontal reciprocating movement of the first scrapers. This ensures that two first scrapers are always in contact with the circulating filter belt to perform the scraping function, preventing filter cake residue on the surface of the circulating filter belt and improving the scraping effect. At the same time, the other two first scrapers move relative to the second scrapers as they move away from the circulating filter belt, thus scraping off the filter cake accumulated at the top of the first scrapers, improving the scraping and cleaning efficiency.

[0022] 3. When the first scraper, which is away from the circulating filter belt, moves to the underside of the cleaning nozzle, the cleaning nozzle sprays water onto the surface of the first scraper to clean it, achieving a dual cleaning effect of scraping and spraying. This ensures that the first scraper always maintains a good working condition and further improves the efficiency and quality of filter cake scraping.

[0023] 4. The discharge screw is driven to rotate by the second rotary motor, which accelerates the discharge of filter cake and improves the overall working efficiency of the equipment. The design of the discharge port allows the filter cake to be smoothly discharged from the filter cake collection box, which is convenient for subsequent processing and transfer.

[0024] 5. The elastically installed pressure plate inside the filter cake collection box can provide support for the circulating filter belt, maintaining a certain pressure between the circulating filter belt and the first scraper, ensuring that the filter cake can be scraped off smoothly, and improving the reliability and stability of filter cake scraping.

[0025] In summary, the vacuum belt filter used for the synthesis of methyl thiophanate has many advantages, including high filtration efficiency, good filter cake scraping effect, strong cleaning function, efficient discharge of filter residue, and stable and reliable operation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a first-view perspective perspective view of the present invention;

[0028] Figure 2 This is a top view of the present invention;

[0029] Figure 3 This is a second-view perspective perspective view of the present invention;

[0030] Figure 4 This is a first-view perspective perspective view of the filter cake collection box of the present invention;

[0031] Figure 5 This is a second-view perspective perspective view of the filter cake collection box of the present invention;

[0032] Figure 6 for Figure 5 Enlarged detail image of position A in the middle;

[0033] Figure 7 This is a perspective sectional view of the filter cake collection box of the present invention;

[0034] Figure 8 This is a third-view perspective view of the filter cake collection box of the present invention;

[0035] Figure 9 This is a schematic diagram of the first scraper's first viewing angle distribution according to the present invention;

[0036] Figure 10 This is a schematic diagram of the second perspective distribution of the first scraper of the present invention;

[0037] Figure 11 This is a schematic diagram of the third-view distribution of the first scraper of the present invention;

[0038] Figure 12 This is a front-view sectional view of the filter cake collection box of the present invention;

[0039] Figure 13 for Figure 12 Enlarged detail image of position B in the middle.

[0040] In the diagram: 1 Drive frame, 101 Circulating filter belt, 102 Feeding area, 103 Discharge area, 104 Washing nozzle, 2 Storage tank, 201 Inlet pipe, 202 Outlet pipe, 203 Liquid pump, 4 Filter cake collection box, 401 Discharge port, 402 Discharge screw, 403 Second rotary motor, 5 First scraper, 501 Second scraper, 502 Slider, 503 Horizontal slide rail, 601 First rack, 602 Second rack, 603 Third rack, 604 Fourth rack, 606 First transmission gear, 607 Second transmission gear, 608 Drive bar, 609 Reciprocating screw, 610 First rotary motor, 7 Pressure plate, 701 Guide rod, 702 Limiting component, 703 Spring, 8 Cleaning liquid inlet pipe, 801 Cleaning nozzle. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] Reference Figure 1-13 A vacuum belt filter for synthesizing methyl thiophanate includes a drive frame 1, a circulating filter belt 101, and a storage tank 2. The circulating filter belt 101 is mounted on the drive frame 1, and the drive frame 1 drives the circulating filter belt 101 to move cyclically. A vacuum suction box is provided on the inner side of the circulating filter belt 101. The storage tank 2 is connected to the vacuum suction box through an inlet pipe 201. The vacuum suction box is maintained at a low pressure by a vacuum pump. The storage tank 2 is connected to a liquid pump 203 through an outlet pipe 202 to transport the liquid away. One end of the circulating filter belt 101 is a feeding area 102, and the other end is a discharge area 103. A filter cake collection box 4 is provided on the side of the circulating filter belt 101 near the discharge area 103.

[0044] The wet material is discharged onto the feeding area 102 via a feeding device and moved by the circulating filter belt 101. When the circulating filter belt 101 carries the material to the vacuum suction box area, the pressure difference generates a suction force towards the vacuum suction box, thus accelerating filtration. The volume contained in the wet material passes through the filter and enters the vacuum suction box, where it can be temporarily sucked into the storage tank 2. Multiple sets of vacuum suction boxes and storage tanks 2 are equidistantly distributed to efficiently filter the wet material. Finally, the material is circulated... A filter cake forms on the surface of the filter belt 101. A washing nozzle 104 is provided on the side of the drive frame 1 near the filter cake collection box 4. The washing nozzle 104 sprays hot water at 60-80°C to wash the filter cake. After the filter cake moves to the discharge area 103, the filter cake collection box 4 is equipped with a filter cake scraping mechanism and a filter cake discharge mechanism, which can scrape the filter cake off the surface of the circulating filter belt 101 and make it fall into the filter cake collection box 4 for collection. The next step is to transfer it to the dryer for drying to obtain the methyl thiophanate finished product.

[0045] Example 2

[0046] Reference Figure 1-13The difference between this embodiment and embodiment 1 is that the filter cake scraping mechanism includes a first scraper 5, the filter cake collection box 4 is an open design, and a horizontal slide rail 503 is provided on the inner wall of the filter cake collection box 4. The first scraper 5 is slidably mounted on the horizontal slide rail 503 by a slider 502, and can move horizontally within the filter cake collection box 4. The circulating filter belt 101 moves through the filter cake collection box 4.

[0047] The first scraper 5 can contact the surface of the circulating filter belt 101 and has a certain pressure. When the circulating filter belt 101 moves in a cycle, the circulating filter belt 101 and the first scraper 5 are aligned, so that the filter cake on the surface of the circulating filter belt 101 can be scraped off by the first scraper 5, so that the filter cake falls into the filter cake collection box 4.

[0048] To prevent the filter cake from accumulating on the surface of the first scraper 5 and to improve the effect of scraping the filter cake, four first scrapers 5 are provided, and the four first scrapers 5 are evenly distributed from top to bottom. Four second scrapers 501 are fixed on the inner wall of the filter cake collection box 4. The second scrapers 501 correspond one-to-one with the first scrapers 5, and the bottom end of the second scraper 501 contacts the top surface of the first scraper 5.

[0049] When the first scraper 5 moves horizontally, the second scraper 501 moves relative to the first scraper 5, thereby scraping off the filter cake gathered at the top of the first scraper 5 and causing it to fall into the filter cake collection box 4.

[0050] The filter cake collection box 4 is equipped with a scraper drive mechanism, which includes a first rack 601, a second rack 602, a third rack 603, and a fourth rack 604, which are fixed to the four first scrapers 5 in sequence. A first transmission gear 606 is provided between the first rack 601 and the second rack 602, and a second transmission gear 607 is provided between the third rack 603 and the fourth rack 604. The first rack 601 and the second rack 602 are both meshed with the first transmission gear 606, and the third rack 603 and the fourth rack 604 are both meshed with the second transmission gear 607. A drive bar 608 is fixed between the second rack 602 and the fourth rack 604. A reciprocating screw 609 is rotatably installed on the outer wall of the filter cake collection box 4. The reciprocating screw 609 passes through the drive bar 608 through a threaded hole, and the reciprocating screw 609 is driven to rotate by a first rotary motor 610.

[0051] When the first rotary motor 610 is turned on, the rotation of the reciprocating screw 609 drives the drive bar 608 to move horizontally back and forth, thereby driving the second rack 602 and the fourth rack 604 to move horizontally back and forth. Due to the transmission action of the first transmission gear 606 and the second transmission gear 607, the first rack 601 and the second rack 602 move synchronously in opposite directions, and the third rack 603 and the fourth rack 604 move synchronously in opposite directions. Therefore, it can be ensured that two of the first scrapers 5 are in contact with the circulating filter belt 101, which undertakes the function of scraping material, improves the scraping effect, and prevents filter cake residue from remaining on the surface of the circulating filter belt 101. The remaining two first scrapers 5 are away from the circulating filter belt 101, and during the process of moving away from the circulating filter belt 101, they will undergo relative displacement with the second scraper 501, thereby achieving the effect of scraping off the filter cake accumulated at the top of the first scraper 5. By switching the positions of the two first scrapers 5, the scraping and cleaning efficiency is improved.

[0052] Example 3

[0053] Reference Figure 1-13 The difference between this embodiment and embodiment 2 is that the filter cake collection box 4 is provided with a scraper rinsing mechanism inside. The scraper rinsing mechanism includes a cleaning liquid inlet pipe 8, and multiple cleaning nozzles 801 are connected to the cleaning liquid inlet pipe 8. Each cleaning nozzle 801 corresponds to a first scraper 5.

[0054] When the remaining two first scrapers 5 are far away from the circulating filter belt 101, they move exactly below the cleaning nozzle 801. The cleaning nozzle 801 can spray water to clean the surface of the first scrapers 5, achieving a dual cleaning effect of scraping and spraying.

[0055] The filter cake discharge mechanism includes a discharge screw 402, which is rotatably installed inside the filter cake collection box 4 near the bottom. The discharge screw 402 is driven to rotate by a second rotary motor 403. A discharge port 401 is provided on one side of the filter cake collection box 4, and the discharge screw 402 extends to the outside of the filter cake collection box 4 through the discharge port 401.

[0056] The discharge of filter residue can be accelerated by rotating the discharge screw 402 driven by the second rotary motor 403.

[0057] The filter cake collection box 4 is elastically installed with a pressure plate 7. The pressure plate 7 is arranged parallel to the circulating filter belt 101. A guide rod 701 is provided on the side of the pressure plate 7 away from the first scraper 5. The guide rod 701 passes through the side wall of the filter cake collection box 4 through the guide hole and is connected to the limiting member 702. A spring 703 is sleeved on the outside of the guide rod 701.

[0058] The pressure plate 7 can provide support to the circulating filter belt 101, so that the circulating filter belt 101 and the first scraper 5 can maintain a certain pressure, thereby ensuring that the filter cake can be scraped off.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0062] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vacuum belt filter for synthesizing methyl thiophanate, comprising a drive frame (1), a circulating filter belt (101), and a storage tank (2), characterized in that: The circulating filter belt (101) is installed on the drive frame (1). The drive frame (1) drives the circulating filter belt (101) to move in a cycle. A vacuum suction box is provided on the inner side of the circulating filter belt (101). The liquid storage tank (2) is connected to the vacuum suction box through the liquid inlet pipe (201). The vacuum suction box is maintained at a low pressure by a vacuum pump. The liquid storage tank (2) is connected to the liquid pump (203) through the liquid outlet pipe (202) to transport the liquid away. One end of the circulating filter belt (101) is the feeding area (102), and the other end is the discharge area (103). A filter cake collection box (4) is provided on the side of the circulating filter belt (101) near the discharge area (103). The filter cake collection box (4) is equipped with a filter cake scraping mechanism and a filter cake discharge mechanism; A washing nozzle (104) is provided on the side of the drive frame (1) near the filter cake collection box (4). The filter cake scraping mechanism includes a first scraper (5), the filter cake collection box (4) is an open design, and a horizontal slide rail (503) is provided on the inner wall of the filter cake collection box (4). The first scraper (5) is slidably installed on the horizontal slide rail (503) through a slider (502), and can move horizontally in the filter cake collection box (4). The circulating filter belt (101) moves through the filter cake collection box (4). The first scraper (5) is provided in four parts, and the four first scrapers (5) are distributed at equal intervals from top to bottom. The inner wall of the filter cake collection box (4) is fixed with four second scrapers (501). The second scrapers (501) correspond one-to-one with the first scrapers (5), and the bottom end of the second scraper (501) is in contact with the top surface of the first scraper (5).

2. A vacuum belt filter for synthesizing methyl thiophanate according to claim 1, characterized in that: The filter cake collection box (4) is provided with a scraper driving mechanism, which includes a first rack (601), a second rack (602), a third rack (603) and a fourth rack (604), and is fixed to the four first scrapers (5) in sequence. A first transmission gear (606) is provided between the first rack (601) and the second rack (602), and a second transmission gear (607) is provided between the third rack (603) and the fourth rack (604).

3. A vacuum belt filter for synthesizing methyl thiophanate according to claim 2, characterized in that: The first rack (601) and the second rack (602) are both meshed with the first transmission gear (606), and the third rack (603) and the fourth rack (604) are both meshed with the second transmission gear (607).

4. A vacuum belt filter for synthesizing methyl thiophanate according to claim 3, characterized in that: A drive bar (608) is fixed between the second rack (602) and the fourth rack (604). A reciprocating screw (609) is rotatably mounted on the outer wall of the filter cake collection box (4). The reciprocating screw (609) passes through the drive bar (608) through a threaded hole and is driven to rotate by the first rotary motor (610).

5. A vacuum belt filter for synthesizing methyl thiophanate according to claim 4, characterized in that: The filter cake collection box (4) is equipped with a scraper rinsing mechanism inside. The scraper rinsing mechanism includes a cleaning liquid inlet pipe (8), and multiple cleaning nozzles (801) are connected to the cleaning liquid inlet pipe (8). The cleaning nozzles (801) correspond one-to-one with the first scraper (5).

6. A vacuum belt filter for synthesizing methyl thiophanate according to claim 1, characterized in that: The filter cake discharge mechanism includes a discharge screw (402), which is rotatably mounted inside the filter cake collection box (4) near the bottom. The discharge screw (402) is driven to rotate by the second rotary motor (403). The filter cake collection box (4) has a discharge port (401) on one side. The discharge screw (402) extends to the outside of the filter cake collection box (4) through the discharge port (401).

7. A vacuum belt filter for synthesizing methyl thiophanate according to claim 1, characterized in that: The filter cake collection box (4) is internally fitted with a pressure plate (7), which is arranged parallel to the circulating filter belt (101).

8. A vacuum belt filter for synthesizing methyl thiophanate according to claim 7, characterized in that: The pressure plate (7) is provided with a guide rod (701) on the side away from the first scraper (5). The guide rod (701) passes through the side wall of the filter cake collection box (4) through the guide hole and is connected to the limiting member (702). A spring (703) is sleeved on the outside of the guide rod (701).

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