Filtering system for production of methyl cyanamide formate

Abstract

The invention discloses a filtering system for production of cyanamide methyl formate, the filtering system comprises a filtering support, a multi-stage filtering mechanism and a filtrate series connection mechanism, the filtering support is provided with a plurality of filter pressing through grooves and discharge through grooves, the number of the filter pressing through grooves is the same as that of the discharge through grooves, and the filter pressing through grooves and the discharge through grooves are alternately arranged; the multi-stage filtering mechanism comprises a plurality of filtering plates, recesses for storing filter residues are formed in the top ends of the filtering plates, and the number of the filtering plates is the sum of the number of the filter pressing through grooves and the number of the discharging through grooves. By adopting graded filtration, impurities with different particle sizes can be intercepted in sequence, the filtration precision is greatly improved, the purity and the quality stability of a methyl cyanamide formate product are guaranteed, compared with a single-aperture filter screen, large-particle impurities are firstly removed through step-by-step filtration, the impurity load of a subsequent small-aperture filter screen is reduced, the blocking risk is remarkably reduced, and the production efficiency is improved. The filtering process can be stably and uninterruptedly operated for a long time, and the production rhythm is maintained.

Description

Technical Field

[0001] The invention relates to the technical field of methyl cyanamide formate production, and in particular to a filtering system for methyl cyanamide formate production. Background Art

[0002] Methyl cyanocarbamate is an important intermediate in the synthesis of the pesticide fungicide carbendazim. After methyl chloroformate is prepared, cyanamide generated by the hydrolysis of lime nitrogen is used to carry out cyanamination reaction to produce methyl cyanocarbamate, which is then condensed with o-phenylenediamine in an acidic aqueous solution to obtain carbendazim.

[0003] In the production process of methyl cyanamide formate, the filtration process plays a vital role, which is directly related to product quality and production efficiency. Traditional filtration devices have the following problems and are difficult to meet the needs of modern production.

[0004] 1. Most traditional filtration equipment uses a single-aperture filter. When faced with impurities of varying sizes in the stock solution, large particles of impurities can easily accumulate on the filter surface, causing the filter channel to quickly become blocked and the filtration efficiency to drop sharply. This not only makes it difficult to control the amount of impurities in the product, affecting the purity of the product, but also frequently forces the production line to shut down for filter replacement, greatly increasing production costs and time costs.

[0005] 2. Traditional filtering devices usually lack effective automatic residue discharge and cleaning mechanisms. The filter residue adheres to the filter screen for a long time, further aggravating the clogging problem. Manual cleaning of the filter residue is not only time-consuming and labor-intensive, but also easily damages the filter screen due to improper operation, shortening its service life.

[0006] In general, these defects of traditional filtration devices limit the development of methyl cyanamide formate production industry towards a more efficient and higher quality direction. A newly designed filtration device is urgently needed to overcome the above problems. Summary of the invention

[0007] In order to solve the problems mentioned in the above background technology, the present invention provides a filtration system for the production of methyl cyanamide formate.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A filtration system for producing methyl cyanamide formate comprises a filtration support, a multi-stage filtration mechanism and a filtrate series connection mechanism, wherein the filtration support is provided with a plurality of filter press slots and discharge slots, the number of the filter press slots and the discharge slots are the same, and the filter press slots and the discharge slots are alternately arranged;

[0010] The multi-stage filtering mechanism comprises a plurality of filter plates, the top of each filter plate is provided with a depression for storing filter residue, the number of the filter plates is the sum of the number of the filter press slots and the discharge slots, and the multi-stage filtering mechanism can rotate relative to the filter bracket;

[0011] The filtrate series connection mechanism guides the filtrate so that the filtrate flows in series between the filter press channels.

[0012] Preferably, the filtrate series mechanism includes an upper flow guide cover and a lower flow guide cover, which form a pair of two and are symmetrically arranged up and down. The upper flow guide cover is fixed at the top of the filter bracket and the position of the filter press slot, and the lower flow guide cover is installed on the lifting bracket and driven to move up and down by a cylinder.

[0013] Preferably, the lower flow guide cover is located below the filter bracket and corresponds to the position of the filter press slot, the top end of the upper flow guide cover and the bottom end of the lower flow guide cover are connected in series through connecting pipes in sequence, and a liquid inlet connecting pipe is installed on the upper flow guide cover closest to the liquid inlet end, and a liquid discharge connecting pipe is installed on the lower flow guide cover closest to the liquid outlet end.

[0014] Preferably, the plurality of filter plates are divided into two groups, the number of filter plates in each group is the same as the number of filter pressure channels, and the filter hole diameters of the filter plates in each group decrease in sequence along the flow direction of the filtrate.

[0015] Preferably, a plurality of the filter plates are installed on the outer periphery of the drive box, and the drive box is a cylindrical structure, and the filter plates are distributed in a circular array around the drive box.

[0016] Preferably, a driving bracket is provided directly above the filter bracket, a rotating motor is fixedly mounted on the top of the driving bracket, a vertical rotating shaft is fixed to the output shaft of the rotating motor, and the bottom end of the vertical rotating shaft is fixed to the top of the driving box.

[0017] Preferably, the filter plates are rotatably mounted on the outer periphery of the driving box, and the driving box can respectively drive one group of the two groups of filter plates to flip relative to the driving box.

[0018] Preferably, the mounting shaft of the filter plate extends to the interior of the drive box and is fixed with a first gear, a rotating column is installed in the drive box, a plurality of connecting rods are fixed to the outside of the rotating column, the number of the connecting rods is the same as the number of filter plates in each group of filter plates, and an arc-shaped rack is fixed to one end of the connecting rod away from the rotating column.

[0019] Preferably, the arc-shaped rack matches the first gear, and the length of the arc-shaped rack ensures that it will only mesh with one of the two adjacent first gears at the same time.

[0020] Preferably, two push rod motors are provided in the drive box, the output shaft of the push rod motor is fixed with a spur rack, the outside of the rotating column is fixed with a second gear, the two spur racks are located on both sides of the second gear, and the two push rod motors respectively drive the two spur racks to move, which can drive the rotating column to rotate in different directions.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. High-efficiency graded filtration: The filter plates are divided into two groups, the number of which matches the filter press slot, and the aperture of each group of filter plates decreases in sequence along the flow direction of the filtrate. It can intercept impurities of different particle sizes in sequence, greatly improve the filtration accuracy, and ensure the purity and quality stability of methyl cyanamide formate products.

[0023] 2. Anti-clogging and stable operation: Compared with single-aperture filters, step-by-step filtration removes large-particle impurities first, reduces the impurity load of subsequent small-aperture filters, significantly reduces the risk of clogging, and enables the filtration process to run stably and uninterruptedly for a long time to maintain the production rhythm.

[0024] 3. Extend the life of the filter: The large-aperture filter plate at the front intercepts large particles, reducing the physical damage such as friction and impact suffered by the subsequent filter plates with smaller apertures, thus extending the service life of the filter as a whole and reducing the frequency and cost of equipment operation and maintenance.

[0025] 4. Flexible switching between filtration and discharge: The multi-stage filtration mechanism can rotate relative to the filter bracket, and the positions of the two groups of filter plates can be easily swapped. When one group is filtering, the other group is discharging and cleaning, ensuring the continuity of the filtration process and improving the overall filtration efficiency.

[0026] 5. Good sealing and multi-stage diversion: The filtrate series mechanism uses the upper and lower diversion covers and connecting pipes that are symmetrical up and down, and cooperates with sealing pads to ensure good sealing when the filter press channels are connected in series, realize multi-stage filtration, and finally obtain high-quality clear liquid discharge.

[0027] 6. Convenient automatic discharge: The push rod motor, gears, racks and other components in the drive box work together to accurately control the filter plate in the discharge state to flip 180°. Together with the guide plate, the filter cakes can be automatically cleaned and concentrated, reducing manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 It is an overall stereogram of the present invention;

[0030] Figure 2 It is the overall front view of the present invention;

[0031] Figure 3 It is a detailed diagram of the filtrate series mechanism of the present invention;

[0032] Figure 4 It is a schematic top view of the relative position relationship between the filter support and the multi-stage filter mechanism of the present invention;

[0033] Figure 5 It is a schematic diagram of the relative position relationship between the filter support and the multi-stage filter mechanism of the present invention from an oblique downward perspective;

[0034] Figure 6 An exploded view of the filter support and multi-stage filter mechanism of the present invention;

[0035] Figure 7 A schematic diagram showing the completion of flipping of one set of filter plates in the multi-stage filter mechanism of the present invention;

[0036] Figure 8 It is a schematic diagram of a group of filter plates in the multi-stage filtering mechanism of the present invention during the flipping process;

[0037] Fig. 9 It is a schematic diagram of the internal structure of the drive box of the present invention from a top view;

[0038] Fig.10 for Fig. 9 A zoomed-in detail of position A in the middle;

[0039] Fig.11 It is a three-dimensional schematic diagram of the internal structure of the drive box of the present invention;

[0040] In the figure: 1. filter bracket; 101. filter press slot; 102. discharge slot; 103. guide plate; 2. drive bracket; 201. rotary motor; 202. vertical shaft; 3. drive box; 301. filter plate; 302. first gear; 303. rotating column; 304. connecting rod; 305. arc rack; 306. push rod motor; 307. straight rack; 308. second gear; 4. filtrate series mechanism; 401. upper guide cover; 402. lower guide cover; 403. connecting pipe; 404. liquid inlet connecting pipe; 405. discharge connecting pipe. 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 1-11 A filtering system for producing methyl cyanamide formate comprises a filtering support 1, a multi-stage filtering mechanism and a filtrate series connection mechanism 4, wherein a plurality of filter press slots 101 and discharge slots 102 are provided on the filtering support 1, the number of the filter press slots 101 and the discharge slots 102 are the same, and the filter press slots 101 and the discharge slots 102 are alternately arranged;

[0044] The multi-stage filtering mechanism includes a plurality of filter plates 301, the top of each filter plate 301 is provided with a depression for storing filter residue, the number of the filter plates 301 is the sum of the number of the filter press slots 101 and the discharge slots 102, and the multi-stage filtering mechanism can rotate relative to the filter bracket 1;

[0045] When the filtering mechanism stops, it is ensured that half of the filter plates 301 are facing the filter press slot 101, and half of the filter plates 301 are facing the discharge slot 102. The group of filter plates 301 facing the filter press slot 101 is in working condition, and the filtrate flows through each filter plate 301 in working condition in turn, so as to achieve the purpose of graded filtration. The filtered solid impurities form filter cakes on the top of the filter plates 301, and the group of filter plates 301 aligned with the discharge slot 102 is in a discharge and cleaning state. By driving the multi-stage filtering mechanism to rotate, the positions of the two groups of filter plates 301 can be swapped, thereby switching between filtering and discharge. When the filter plate 301 is aligned with the discharge slot 102, the filter cake on the top of the filter plate 301 can be cleaned.

[0046] Example 2

[0047] Reference Figure 1-11The difference between this embodiment and embodiment 1 is that the filtrate series connection mechanism 4 guides the filtrate so that the filtrate flows in series between each filter press slot 101. The filtrate series connection mechanism 4 includes an upper guide cover 401 and a lower guide cover 402. The upper guide cover 401 and the lower guide cover 402 form a pair and are symmetrically arranged up and down. The upper guide cover 401 is fixed at the top of the filter support 1 and the position of the filter press slot 101. The lower guide cover 402 is installed on the lifting support and driven to move up and down by the cylinder. The lower guide cover 402 is located below the filter support 1 and corresponds to the position of the filter press slot 101. The top end of the upper guide cover 401 and the bottom end of the lower guide cover 402 are connected in series through a connecting pipe 403 at one time, and a liquid inlet connecting pipe 404 is installed on the upper guide cover 401 closest to the liquid inlet end, and a liquid discharge connecting pipe 405 is installed on the lower guide cover 402 closest to the liquid outlet end.

[0048] By driving the lower air guide cover 402 to move upward, it can be ensured that the lower air guide cover 402 is in close contact with the filter plate 301. The top and bottom ends of the filter plate 301 and the top of the lower air guide cover 402 are provided with sealing pads. During the rotation of the filtering mechanism, the top of the filter plate 301 is tightly fitted with the bottom end of the filter bracket 1 to ensure the sealing during the combination. The filtered liquid first enters the first filter press slot 101 from the liquid inlet connecting pipe 404. After being filtered by the filter plate 301, the liquid enters the lower air guide cover 402, and then enters the next stage through the connecting pipe 403, thereby performing multi-stage filtration, and finally discharged from the drain connecting pipe 405 to discharge the clear liquid.

[0049] Example 3

[0050] Reference Figure 1-11 The difference between this embodiment and embodiment 1 is that the multiple filter plates 301 are divided into two groups, the number of filter plates 301 in each group is the same as the number of filter press slots 101, and the filter hole diameters of each filter plate 301 in each group of filter plates 301 decrease in sequence along the flow direction of the filtrate;

[0051] This step-by-step filtration method intercepts impurities of different particle sizes in sequence, greatly improving filtration accuracy and product purity, and ensuring stable quality. Compared with the disadvantages of single-aperture filters that are easily clogged and require frequent changes, step-by-step filtration first screens large particles, reduces the impurity load of subsequent small-aperture filters, reduces the risk of clogging, and maintains long-term operation of the process. At the same time, the pre-filter plate 301 intercepts large particles, reduces the damage to the subsequent plate 301 caused by friction, impact, etc., extends the life of the overall filter, and reduces operation and maintenance costs.

[0052] Example 4

[0053] Reference Figure 1-11The difference between this embodiment and embodiment 2 is that a plurality of filter plates 301 are installed on the outer periphery of the drive box 3, and the drive box 3 is a cylindrical structure, and the filter plates 301 are distributed in a circular array around the drive box 3.

[0054] Among them, a driving bracket 2 is provided directly above the filter bracket 1, and a rotating motor 201 is fixedly installed on the top of the driving bracket 2. The output shaft of the rotating motor 201 is fixed with a vertical rotating shaft 202. The bottom end of the vertical rotating shaft 202 is fixed to the top of the driving box 3, and the filter plate 301 is rotatably installed on the outer periphery of the driving box 3. The driving box 3 can drive one of the two groups of filter plates 301 to flip relative to the driving box 3.

[0055] When the filter plate 301 is aligned with the discharge slot 102 and is in the discharge and cleaning state, the filter plate 301 can be driven to flip 180 degrees so that the top of the filter plate 301 faces downward, and the filter cake gathered on the top of the filter plate 301 can be poured down. Below the filter bracket 1, the discharge slot 102 is provided with an inclined guide plate 103 for collecting the filter cake.

[0056] Example 5

[0057] Reference Figure 1-11 The difference between this embodiment and embodiment 4 is that the installation shaft of the filter plate 301 extends to the interior of the drive box 3 and is fixed with a first gear 302, a rotating column 303 is installed in the drive box 3, and a plurality of connecting rods 304 are fixed to the outside of the rotating column 303, the number of connecting rods 304 is the same as the number of filter plates 301 in each group of filter plates 301, and an arc-shaped rack 305 is fixed to one end of the connecting rod 304 away from the rotating column 303, the arc-shaped rack 305 matches the first gear 302, and the length of the arc-shaped rack 305 ensures that it will only mesh with one of the two adjacent first gears 302 at the same time, and two push rod motors 306 are provided in the drive box 3, and the output shaft of the push rod motor 306 is fixed. There is a straight rack 307, and a second gear 308 is fixed to the outside of the rotating column 303. The two straight racks 307 are located on both sides of the second gear 308. The two push rod motors 306 respectively drive the two straight racks 307 to move, which can drive the rotating column 303 to rotate in different directions. When the rotating column 303 rotates clockwise, it can drive multiple arc-shaped racks 305 to rotate synchronously, so that the arc-shaped rack 305 and the first gear 302 connected to one group of filter plates 301 are rotated to drive the group of filter plates 301 in the discharging state to flip 180 degrees. When the rotating column 303 rotates counterclockwise, it can drive the other group of filter plates 301 to rotate in reverse, thereby achieving the purpose of facilitating discharging.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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 filtration system for the production of methyl cyanamide formate, comprising a filtration support (1), a multi-stage filtration mechanism and a filtrate series connection mechanism (4), characterized in that: The filter support (1) is provided with a plurality of filter press grooves (101) and discharge grooves (102), the number of the filter press grooves (101) and the number of the discharge grooves (102) are the same, and the filter press grooves (101) and the discharge grooves (102) are arranged alternately with each other; The multi-stage filtering mechanism comprises a plurality of filter plates (301), the top of each filter plate (301) being provided with a depression for storing filter residue, the number of the filter plates (301) being the sum of the number of the filter pressure slots (101) and the number of the discharge slots (102), and the multi-stage filtering mechanism is capable of rotating relative to the filter support (1); The filtrate series connection mechanism (4) guides the filtrate so that the filtrate flows in series between the filter press channels (101).

2. A filtration system for the production of methyl cyanamide formate according to claim 1, characterized in that: The filtrate series connection mechanism (4) comprises an upper flow guide cover (401) and a lower flow guide cover (402), wherein the upper flow guide cover (401) and the lower flow guide cover (402) form a pair and are symmetrically arranged up and down, the upper flow guide cover (401) is fixed at the top of the filter support (1) and the position of the filter press slot (101), and the lower flow guide cover (402) is installed on the lifting support and is driven to move up and down by a cylinder.

3. A filtration system for the production of methyl cyanamide formate according to claim 2, characterized in that: The lower flow guide cover (402) is located below the filter support (1) and corresponds to the position of the filter press slot (101); the top end of the upper flow guide cover (401) and the bottom end of the lower flow guide cover (402) are connected in series via a connecting pipe (403); a liquid inlet connecting pipe (404) is installed on the upper flow guide cover (401) closest to the liquid inlet end, and a liquid discharge connecting pipe (405) is installed on the lower flow guide cover (402) closest to the liquid outlet end.

4. A filtration system for the production of methyl cyanamide formate according to claim 1, characterized in that: The plurality of filter plates (301) are divided into two groups, the number of filter plates (301) in each group is the same as the number of filter pressure channels (101), and the diameter of the filter holes of each filter plate (301) in each group of filter plates (301) decreases in sequence along the flow direction of the filtrate.

5. A filtration system for the production of methyl cyanamide formate according to claim 4, characterized in that: A plurality of the filter plates (301) are installed on the outer periphery of the drive box (3), and the drive box (3) is a cylindrical structure, and the filter plates (301) are distributed in a circular array around the drive box (3).

6. A filtration system for the production of methyl cyanamide formate according to claim 5, characterized in that: A driving bracket (2) is provided directly above the filtering bracket (1), a rotating motor (201) is fixedly mounted on the top of the driving bracket (2), a vertical rotating shaft (202) is fixed to the output shaft of the rotating motor (201), and the bottom end of the vertical rotating shaft (202) is fixed to the top of the driving box (3).

7. A filtration system for the production of methyl cyanamide formate according to claim 6, characterized in that: The filter plates (301) are rotatably mounted on the outer periphery of the drive box (3), and the drive box (3) can respectively drive one of the two groups of filter plates (301) to flip relative to the drive box (3).

8. A filtration system for the production of methyl cyanamide formate according to claim 7, characterized in that: The installation shaft of the filter plate (301) extends to the interior of the drive box (3) and is fixed with a first gear (302). A rotating column (303) is installed in the drive box (3). A plurality of connecting rods (304) are fixed to the exterior of the rotating column (303). The number of the connecting rods (304) is the same as the number of the filter plates (301) in each group of filter plates (301). An arc-shaped rack (305) is fixed to one end of the connecting rod (304) away from the rotating column (303).

9. A filtration system for the production of methyl cyanamide formate according to claim 8, characterized in that: The arc-shaped rack (305) matches the first gear (302), and the length of the arc-shaped rack (305) ensures that it will only mesh with one of the two adjacent first gears (302) at the same time.

10. A filtration system for the production of methyl cyanamide formate according to claim 9, characterized in that: The driving box (3) is provided with two push rod motors (306), the output shaft of the push rod motor (306) is fixed with a spur rack (307), the outside of the rotating column (303) is fixed with a second gear (308), the two spur racks (307) are located on both sides of the second gear (308), and the two push rod motors (306) respectively drive the two spur racks (307) to move, so that the rotating column (303) can be driven to rotate in different directions.

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