Vacuum belt filter for synthesizing thiophanate-methyl

Abstract

The vacuum belt filter comprises a driving frame, a circulating filter belt and a liquid storage tank, the circulating filter belt is installed on the driving frame, the driving frame drives the circulating filter belt to move circularly, a vacuum suction box is arranged on the inner side of the circulating filter belt, the liquid storage tank is communicated with the vacuum suction box through a liquid inlet pipe, and the liquid storage tank is communicated with the circulating filter belt through a liquid outlet pipe. The vacuum suction box is kept in a low-pressure state through a vacuum pump, the liquid storage tank is connected with a liquid pump through a liquid outlet pipe and conveys liquid away, one end of the circulating filter belt is a feeding area, the other end of the circulating filter belt is a discharging area, and a filter cake collecting box is arranged on the side, close to the discharging area, of the circulating filter belt; a filter cake scraping mechanism and a filter cake discharging mechanism are arranged in the filter cake collecting box. The vacuum belt filter for synthesizing thiophanate-methyl has the advantages of high filtering efficiency, good filter cake scraping effect, strong cleaning function, efficient filter residue discharge, stable and reliable work and the like.

Description

Technical Field

[0001] The invention relates to the technical field of thiophanate-methyl synthesis, in particular to a vacuum belt filter used for synthesizing thiophanate-methyl. Background Art

[0002] Thiophanate-methyl, chemical formula: C 12 H 14 N 4 O 4 S 2 , is a broad-spectrum systemic low-toxic fungicide with systemic, preventive and therapeutic effects. It was originally developed by Japan Soda Co., Ltd. and can effectively prevent and control diseases of various crops.

[0003] In the process of preparing methyl thiophanate product by synthesis reaction using methyl chloroformate, sodium thiocyanate and o-phenylenediamine as raw materials in a certain ratio in the presence of solvent ethyl acetate and a catalyst, a small amount of incompletely reacted reactants and solvent impurities still exist in the crude wet product methyl thiophanate obtained after the reaction. Therefore, the crude wet product needs to be filtered and washed with water, and a vacuum belt filter is required.

[0004] The vacuum belt filter in the prior art usually adopts a single scraper structure, which is prone to filter cake residue, and the scraping effect is not ideal. In addition, the filter cake is easy to accumulate on the scraper surface, affecting the subsequent scraping operation. Summary of the invention

[0005] In order to solve the problems mentioned in the above background technology, the present invention provides a vacuum belt filter for synthesizing methyl thiophanate.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A vacuum belt filter for synthesizing methyl thiophanate, comprising a driving frame, a circulating filter belt and a liquid storage tank, wherein the circulating filter belt is mounted on the driving frame, the driving frame drives the circulating filter belt to move in a circular motion, a vacuum suction box is arranged inside the circulating filter belt, the liquid storage tank is connected with the vacuum suction box through a liquid inlet pipe, the vacuum suction box is maintained in a low pressure state through a vacuum pump, the liquid storage tank is connected with a liquid pump through a liquid outlet pipe to transport liquid away, one end of the circulating filter belt is a feeding area, and the other end is a discharging area, and a filter cake collecting box is arranged on a side of the circulating filter belt close to the discharging area;

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

[0009] A washing nozzle is arranged on one side of the driving frame above and close to the filter cake collecting box.

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

[0011] Preferably, there are four first scrapers, which are equidistantly distributed from top to bottom, and four second scrapers are fixed on the inner wall of the filter cake collection box, which correspond to the first scrapers one by one, and the bottom ends of the second scrapers are in contact with the top surfaces of the first scrapers.

[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 are both meshed with the first transmission gear, and the third rack and the fourth rack are both meshed with the second transmission gear.

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

[0015] Preferably, a scraper flushing mechanism is provided inside the filter cake collecting box, and the scraper flushing mechanism comprises a cleaning liquid introduction pipe, and a plurality of cleaning nozzles are connected to the cleaning liquid introduction pipe, and the cleaning nozzles correspond to the first scrapers one by one.

[0016] Preferably, the filter cake discharge mechanism includes a discharge screw, which is rotatably installed inside the filter cake collection box near the bottom end, and is driven to rotate by a second rotating 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 one side of the pressure plate away from the first scraper, the guide rod movably penetrates the side wall of the filter cake collecting box through a guide hole and is connected to a limiting member, and a spring is sleeved on the outer side of the guide rod.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The equipment uses the air pressure difference to accelerate the filtration process through the cooperation of the vacuum suction box and the circulating filter belt, and performs efficient pressure filtration on the wet material in the process of synthesizing methyl thiophanate. Multiple groups of vacuum suction boxes and liquid storage tanks are evenly distributed, which further improves the filtration efficiency. The washing nozzle sprays 60-80℃ hot water to spray and wash the filter cake, effectively removing impurities in the filter cake and improving the purity of the methyl thiophanate finished product.

[0021] 2. The coordinated design of the first scraper and the second scraper can prevent the scraped filter cake from accumulating on the surface of the first scraper, thereby improving the effect of scraping the filter cake. The four first scrapers are equidistantly distributed from top to bottom, corresponding to the four second scrapers one by one, ensuring the thorough removal of the filter cake. The scraper drive mechanism drives the reciprocating screw rod through the first rotating motor, driving the rack and the transmission gear to move, realizing the horizontal reciprocating movement of the first scraper, ensuring that there are always two first scrapers in contact with the circulating filter belt to undertake the scraping function, preventing the filter cake from remaining on the surface of the circulating filter belt, and improving the scraping effect. At the same time, the other two first scrapers are relatively displaced with the second scraper in the process of moving away from the circulating filter belt, playing the role of scraping the filter cake accumulated on the top of the first scraper, thereby improving the efficiency of scraping and cleaning;

[0022] 3. When the first scraper away from the circulating filter belt moves to the bottom of the cleaning nozzle, the cleaning nozzle sprays water to clean the surface of the first scraper, achieving the dual cleaning effect of scraping and spraying, ensuring that the first scraper always maintains a good working condition, further improving the efficiency and quality of filter cake scraping;

[0023] 4. The discharge screw is driven by the second rotary motor to accelerate the discharge of filter residue and improve the overall working efficiency of the equipment. The design of the discharge port enables the filter residue 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 generate support force for the circulating filter belt, so that a certain pressure is maintained 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 synthesizing methylthiophanate has many advantages such as high filtration efficiency, good filter cake scraping effect, strong cleaning function, efficient filter residue discharge, and stable and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a first perspective stereogram of the present invention;

[0028] Figure 2 A top view of the present invention;

[0029] Figure 3 It is a second viewing angle stereogram of the present invention;

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

[0031] Figure 5 A second perspective view of the filter cake collection box of the present invention;

[0032] Figure 6 for Figure 5 A zoomed-in detail of position A in the middle;

[0033] Figure 7 It is a three-dimensional cross-sectional view of the filter cake collection box of the present invention;

[0034] Figure 8 A third perspective view of the filter cake collection box of the present invention;

[0035] Fig. 9 This is a schematic diagram of the first viewing angle distribution of the first scraper of the present invention;

[0036] Fig.10 This is a schematic diagram of the second viewing angle distribution of the first scraper of the present invention;

[0037] Fig.11 This is a schematic diagram of the third viewing angle distribution of the first scraper of the present invention;

[0038] Fig.12 It is a cross-sectional view of the filter cake collection box of the present invention from a main perspective;

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

[0040] In the figure: 1 driving frame, 101 circulating filter belt, 102 feeding area, 103 discharging area, 104 washing nozzle, 2 liquid storage tank, 201 liquid inlet pipe, 202 liquid outlet pipe, 203 liquid pump, 4 filter cake collecting box, 401 discharge port, 402 discharge screw, 403 second rotating 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 driving bar, 609 reciprocating screw, 610 first rotating motor, 7 pressure plate, 701 guide rod, 702 limiter, 703 spring, 8 cleaning liquid introduction pipe, 801 cleaning nozzle. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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, comprising a driving frame 1, a circulating filter belt 101 and a liquid storage tank 2, wherein the circulating filter belt 101 is mounted on the driving frame 1, and the driving frame 1 drives the circulating filter belt 101 to move in a circular motion, a vacuum suction box is arranged inside the circulating filter belt 101, the liquid storage tank 2 is connected with the vacuum suction box through a liquid inlet pipe 201, the vacuum suction box is maintained in a low pressure state by a vacuum pump, the liquid storage tank 2 is connected with a liquid pump 203 through a liquid outlet pipe 202, and the liquid is transported away, one end of the circulating filter belt 101 is a feeding area 102, and the other end is a discharging area 103, and a filter cake collecting box 4 is arranged on one side of the circulating filter belt 101 close to the discharging area 103;

[0044] The wet material is discharged onto the feeding area 102 through the feeding device, and is moved by the circulating filter belt 101. When the circulating filter belt 101 moves the material to the vacuum suction box area, due to the pressure difference, suction will be generated in the direction of the vacuum suction box, thereby accelerating the filtration, so that the volume contained in the wet material enters the vacuum suction box after filtration, and the volume can be sucked into the liquid storage tank 2 for temporary storage. The vacuum suction box and the liquid storage tank 2 are provided with multiple groups, which are equidistantly distributed, so as to efficiently filter the wet material, and finally in the circulating filter belt 101, the wet material is filtered. A filter cake is formed on the surface of the filter belt 101. A washing nozzle 104 is provided on one side of the drive frame 1 above the filter cake collecting box 4. The washing nozzle 104 sprays hot water at 60-80°C to wash the filter cake. When the filter cake moves to the discharge area 103, a filter cake scraping mechanism and a filter cake discharge mechanism are provided in the filter cake collecting box 4. The filter cake can be scraped off the surface of the circulating filter belt 101 and dropped into the filter cake collecting box 4 for collection. The filter cake is then transferred to a 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 installed on the horizontal slide rail 503 through a slider 502, and can move horizontally in the filter cake collection box 4, and the circulating filter belt 101 moves through the filter cake collection box 4;

[0047] The first scraper 5 can contact with the surface of the circulating filter belt 101 and has a certain pressure. When the circulating filter belt 101 circulates, the circulating filter belt 101 and the first scraper 5 are first 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] In order to prevent the scraped 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, and the second scrapers 501 correspond to the first scrapers 5 one by one, and the bottom ends of the second scrapers 501 are in contact with 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 , so that the filter cake gathered on the top of the first scraper 5 can be scraped off and dropped into the filter cake collecting box 4 .

[0050] Among them, a scraper driving mechanism is provided on the filter cake collecting box 4, and the scraper driving mechanism 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. 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 driving 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 collecting box 4. The reciprocating screw 609 penetrates the driving bar 608 through a threaded hole, and the reciprocating screw 609 is driven to rotate by the first rotating motor 610;

[0051] When the first rotating motor 610 is turned on, the rotation of the reciprocating screw rod 609 can drive the driving bar 608 to move back and forth horizontally, thereby driving the second rack 602 and the fourth rack 604 to move back and forth horizontally. Due to the transmission effect of the first transmission gear 606 and the second transmission gear 607, the first rack 601 and the second rack 602 maintain synchronous reverse movement, and the third rack 603 and the fourth rack 604 maintain synchronous reverse movement. Therefore, it can be ensured that two first scrapers 5 are in contact with the circulating filter belt 101, and assume the function of scraping materials, improve the scraping effect, and prevent filter cake residues 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 in the process of moving away from the circulating filter belt 101, they will be relatively displaced with the second scraper 501, thereby scraping off the filter cake accumulated on the top of the first scraper 5. The scraping and cleaning efficiency is improved by switching the positions of the two first scrapers 5.

[0052] Example 3

[0053] Reference Figure 1-13 The difference between this embodiment and embodiment 2 is that a scraper flushing mechanism is provided inside the filter cake collecting box 4, and the scraper flushing mechanism includes a cleaning liquid introduction pipe 8, and a plurality of cleaning nozzles 801 are connected to the cleaning liquid introduction pipe 8, and the cleaning nozzles 801 correspond to the first scrapers 5 one by one;

[0054] When the remaining two first scrapers 5 are away from the circulating filter belt 101, they just move to the bottom of the cleaning nozzle 801. The cleaning nozzle 801 can spray water on the surface of the first scraper 5 for cleaning, which has the double cleaning effect of scraping and spraying.

[0055] The filter cake discharge mechanism includes a discharge screw 402, which is rotatably mounted inside the filter cake collection box 4 near the bottom, and 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 the filter residue can be accelerated by driving the discharge screw 402 to rotate via the second rotary motor 403 .

[0057] Among them, a pressing plate 7 is elastically installed inside the filter cake collection box 4, and the pressing plate 7 is arranged parallel to the circulating filter belt 101. A guide rod 701 is arranged on the side of the pressing plate 7 away from the first scraper 5. The guide rod 701 movably penetrates the side wall of the filter cake collection box 4 through the guide hole and is connected to the limiting member 702, and a spring 703 is sleeved on the outer side of the guide rod 701;

[0058] The pressing plate 7 can generate a supporting force for the circulating filter belt 101, so that a certain pressure can be maintained between the circulating filter belt 101 and the first scraper 5, thereby ensuring that the filter cake can be scraped off.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vacuum belt filter for synthesizing thiophanate-methyl, comprising a drive frame (1), a circulating filter belt (101) and a liquid storage tank (2), characterized in that: The circulating filter belt (101) is installed on the driving frame (1), and the driving frame (1) drives the circulating filter belt (101) to move in a circular motion. A vacuum suction box is provided inside the circulating filter belt (101). The liquid storage tank (2) is connected to the vacuum suction box via a liquid inlet pipe (201). The vacuum suction box maintains a low pressure state via a vacuum pump. The liquid storage tank (2) is connected to a liquid pump (203) via a liquid 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 discharging area (103). A filter cake collection box (4) is provided on a side of the circulating filter belt (101) close to the discharging area (103); The filter cake collection box (4) is provided with a filter cake scraping mechanism and a filter cake discharge mechanism; A washing nozzle (104) is provided on one side of the driving frame (1) above and close to the filter cake collecting box (4).

2. A vacuum belt filter for synthesizing thiophanate-methyl according to claim 1, characterized in that: The filter cake scraping mechanism comprises a first scraper (5); the filter cake collecting box (4) is of open design, and a horizontal slide rail (503) is provided on the inner wall of the filter cake collecting box (4); the first scraper (5) is slidably mounted on the horizontal slide rail (503) via a slider (502) and can move horizontally in the filter cake collecting box (4); and the circulating filter belt (101) can move through the filter cake collecting box (4).

3. A vacuum belt filter for synthesizing thiophanate-methyl according to claim 2, characterized in that: Four first scrapers (5) are provided, and the four first scrapers (5) are equidistantly distributed from top to bottom. Four second scrapers (501) are fixed on the inner wall of the filter cake collection box (4), and the second scrapers (501) correspond to the first scrapers (5) one by one, and the bottom ends of the second scrapers (501) are in contact with the top end surfaces of the first scrapers (5).

4. A vacuum belt filter for synthesizing thiophanate-methyl according to claim 3, characterized in that: The filter cake collection box (4) is provided with a scraper driving mechanism, which comprises 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).

5. A vacuum belt filter for synthesizing thiophanate-methyl according to claim 4, 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).

6. A vacuum belt filter for synthesizing thiophanate-methyl according to claim 5, characterized in that: A driving bar (608) is fixed between the second rack (602) and the fourth rack (604), and a reciprocating screw (609) is rotatably mounted on the outer wall of the filter cake collecting box (4). The reciprocating screw (609) passes through the driving bar (608) through a threaded hole, and the reciprocating screw (609) is driven to rotate by a first rotating motor (610).

7. A vacuum belt filter for synthesizing thiophanate-methyl according to claim 6, characterized in that: A scraper flushing mechanism is provided inside the filter cake collection box (4), the scraper flushing mechanism comprising a cleaning liquid introduction pipe (8), a plurality of cleaning nozzles (801) are connected to the cleaning liquid introduction pipe (8), and the cleaning nozzles (801) correspond one to one to the first scrapers (5).

8. A vacuum belt filter for synthesizing thiophanate-methyl according to claim 1, characterized in that: The filter cake discharge mechanism comprises a discharge screw (402), which is rotatably mounted inside the filter cake collection box (4) near the bottom end, and the discharge screw (402) is driven to rotate by a second rotating 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).

9. A vacuum belt filter for synthesizing thiophanate-methyl according to claim 2, characterized in that: A pressing plate (7) is elastically installed inside the filter cake collecting box (4), and the pressing plate (7) is arranged parallel to the circulating filter belt (101).

10. A vacuum belt filter for synthesizing thiophanate-methyl according to claim 9, characterized in that: A guide rod (701) is provided on the side of the pressure plate (7) away from the first scraper (5); the guide rod (701) movably penetrates the side wall of the filter cake collection box (4) through a guide hole and is connected to a limiting member (702); and a spring (703) is sleeved on the outer side of the guide rod (701).

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