Crystal particle drying device and drying method for manufacturing 4-trifluoromethyl nicotinic acid

Abstract

The invention belongs to the field of 4-trifluoromethyl nicotinic acid manufacturing, and particularly relates to a crystal particle drying device and method for 4-trifluoromethyl nicotinic acid manufacturing. A cylinder body is arranged on the bottom plate; a first drying cavity is formed in the cylinder body, openings are formed in the two ends of the first drying cavity, and the cross section of the first drying cavity is circular; a first annular cavity is formed in the cylinder body, and the first annular cavity is arranged around the first drying cavity; an annular partition plate is fixedly connected into the first annular cavity. The first annular cavity is divided into a second drying cavity and a third drying cavity by an annular partition plate, and the third drying cavity is arranged around the second drying cavity; the side wall of the first drying cavity and the annular partition plate are each provided with a set of screen holes. The problem that the internal structures of small crystal particles are damaged due to too long drying time is solved.

Description

Technical Field

[0001] The invention belongs to the field of 4-trifluoromethylnicotinic acid production, and specifically relates to a crystal particle drying device and a drying method for producing 4-trifluoromethylnicotinic acid. Background Art

[0002] 4-Trifluoromethylnicotinic acid is an organic compound containing a pyridine ring and a trifluoromethyl functional group, with a chemical formula of C7H4F3NO2. Its properties include high acidity, thermal stability and fat solubility, making it an important pesticide and pharmaceutical intermediate, such as for the synthesis of the highly effective insecticide flonicamid; during processing, the crystalline particles of 4-trifluoromethylnicotinic acid must be dried to meet the storage stability requirements and maintain its chemical purity.

[0003] In the prior art, when the crude 4-trifluoromethylnicotinic acid crystals are dried, they are generally placed in a drying oven and dried by electric heating. However, there are the following problems: first, the size of the crystals is not a fixed value during production, and there are differences in size. When the produced crystalline particles are directly placed in a drying oven, at the same drying temperature, the time for complete drying of the large and small particles is not the same. The small particles will be dried first due to their characteristics, but the large crystalline particles are not completely dried at this time, so their drying does not stop, and long-term drying will cause the internal structure of the small crystalline particles to be damaged, affecting the quality of the final product; second, when drying is performed after screening, they need to be placed in a drying oven in batches for drying, but the drying oven is heated and dried multiple times, which not only wastes energy, but also greatly reduces the drying efficiency of the entire batch of crystalline particles.

[0004] To this end, the present invention provides a crystalline particle drying device and a drying method for producing 4-trifluoromethylnicotinic acid. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art and solve the problem that the internal structure of small crystalline particles is destroyed due to excessive drying time, the present invention proposes a crystalline particle drying device and a drying method for producing 4-trifluoromethylnicotinic acid.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: a crystalline particle drying device for manufacturing 4-trifluoromethylnicotinic acid described in the present invention comprises a bottom plate; a cylinder is provided on the bottom plate; a first drying chamber is provided in the cylinder, and openings are provided at both ends of the first drying chamber, and the cross section of the first drying chamber is circular; a first annular cavity is provided in the cylinder, and the first annular cavity is arranged around the first drying chamber; an annular partition is fixed in the first annular cavity; the first annular cavity is divided into a second drying chamber and a third drying chamber by the annular partition, and the third drying chamber is arranged around the second drying chamber; a first drying chamber is provided on the side wall and the annular partition; A group of sieve holes are provided; the first drying chamber is connected with the second drying chamber through the sieve holes on the side wall of the first drying chamber, and the second drying chamber and the third drying chamber are connected through the sieve holes on the annular partition; the diameter of the sieve holes on the side wall of the first drying chamber is larger than the diameter of the sieve holes on the annular partition; the second drying chamber and the third drying chamber are both provided with openings at the same end; the opening at one end of the first drying chamber is connected with the feeding assembly; the opening at the other end of the first drying chamber is located at the same end as the openings of the second drying chamber and the third drying chamber and is threadedly connected with a cover plate; a heating assembly is provided in the cylinder; the cylinder rotates through a power assembly.

[0007] Preferably, the power assembly includes a servo motor; the servo motor is installed on the base plate; a first rotating shaft is provided at the output end of the servo motor; a first gear is fixedly connected to the first rotating shaft; a ring gear is fixedly mounted on the middle part of the outer wall of the cylinder; the first gear and the ring gear are meshed with each other.

[0008] Preferably, the heating assembly includes a plurality of first oil chambers; the plurality of first oil chambers are evenly arranged in the side wall of the first drying chamber along the circumference of the first drying chamber; a second oil chamber corresponding to the position and number of the first oil chambers is opened in the annular partition; a third oil chamber corresponding to the position and number of the second oil chambers is opened in the side wall of the third drying chamber; an L-shaped input pipe corresponding to the number of the first oil chambers is opened in the cylinder body, and one end of the L-shaped input pipe penetrates into the cylinder body and is connected with the corresponding first oil chamber, and the other end extends out of the cylinder body; a first connecting pipe is fixedly connected to a position in the second drying chamber close to the opening of the second drying chamber, and the first connecting pipe connects the corresponding first oil chamber and the second oil chamber; a second connecting pipe is fixedly connected to a position in the third drying chamber far from the opening of the third drying chamber, and the second connecting pipe connects the corresponding second oil chamber and the third oil chamber cavity; oil output pipes corresponding to the number of the third oil chambers are fixedly connected at the position of the outer wall of the cylinder near the opening of the third drying chamber; the oil output pipes and the corresponding third oil chambers are communicated with each other; an oil input block is fixedly connected to the bottom plate through a supporting column, and the oil input block is annular and arranged around the cylinder; a first annular plate is rotatably connected to the inner wall of the oil input block, and the first annular plate is fixedly connected to one end of all L-shaped input pipes away from the first oil chamber, an oil output block is fixedly connected to the bottom plate through a supporting column, and the oil output block is annular and arranged around the cylinder; a second annular plate is rotatably connected to the inner wall of the oil output block, and the second annular plate is fixedly connected to all oil output pipes; the oil input block is communicated with the corresponding first oil chamber through all L-shaped input pipes; the oil output block is communicated with the corresponding third oil chamber through all oil output pipes.

[0009] Preferably, the feed assembly includes a feed box; the feed box is fixedly connected to the bottom plate via a support column; the feed box is rotatably connected to an end of the cylinder away from the cover plate via a pipeline, and the feed box is interconnected with the first drying chamber via the pipeline; a second rotating shaft is rotatably connected inside the feed box, and the second rotating shaft enters the first drying chamber through the pipeline; an auger piece is fixed to the second rotating shaft, and the outer side walls of the auger piece are respectively close to the pipeline and the inner wall of the first drying chamber; the end of the first rotating shaft drives the second rotating shaft to rotate via a transmission member.

[0010] Preferably, an annular groove is provided on the outer wall of the cylinder; the ends of the second drying chamber and the third drying chamber away from the cover plate are connected to the annular groove through the first annular groove and the second annular groove respectively; the third annular plate and the fourth annular plate are rotatably connected in the first annular groove and the second annular groove respectively; the third annular plate and the fourth annular plate are slidably connected with sliding shafts near the bottom; a plurality of arc rods are fixedly connected to the two sliding shafts along the setting direction of the sliding shafts, and the arc rods on the two sliding shafts are respectively located in the second drying chamber and the third drying chamber; a plurality of stirring blades are fixedly connected to the arc rods along the setting direction of the arc rods; one end of the two sliding shafts extending into the annular groove is connected to the power unit, and the two sliding shafts slide left and right through the power unit.

[0011] Preferably, the power unit includes an annular baffle; an annular baffle is rotatably connected at the opening of the annular groove; an arc block is slidably connected between the bottom of the annular groove and the inner wall of the annular baffle; one end of the two sliding shafts extending into the annular groove is fixedly connected to the side wall of the arc block; a first through groove is opened on the annular baffle; a circulating screw is arranged in the middle of the first rotating shaft; a first sliding block is fixedly connected to the arc block, and the bottom end of the first sliding block is connected to the circulating screw through the first through groove and a screw nut pair; an inverted U-shaped plate is fixedly connected to the outer wall of the cylinder body, and the inverted U-shaped plate spans the opening of the annular groove; the stirring plate is a quadrilateral in top view, and the four sides of the stirring plate are all concave surfaces; the top of the stirring plate is a pointed end; the four corners of the stirring plate are all sharp corners, and when the sliding shaft slides left and right, a pair of sharp corners arranged along the diagonal in the stirring plate are opposite to the left and right sliding direction of the sliding shaft.

[0012] Preferably, the third annular plate and the fourth annular plate are rotatably connected with a pair of third rotating shafts at the top positions, and each pair of third rotating shafts includes two symmetrically distributed third rotating shafts; one end of the two pairs of the third rotating shafts respectively extends into the second drying chamber and the third drying chamber; each of the third rotating shafts is fixedly connected to a support rod, and a vibration ball is fixedly connected to the end of the support rod; the two support rods in a pair of the third rotating shafts are opposite to each other and staggered; one end of each of the third rotating shafts away from the support rod extends into the annular groove and moves through the circulation unit.

[0013] Preferably, the circulation unit includes a fourth gear; each end of the third rotating shaft located in the annular groove is fixedly connected to a fourth gear; the third annular plate and the fourth annular plate are slidably connected with an H-shaped plate; a group of teeth are fixedly connected on both sides of the H-shaped plate; a group of teeth and the fourth gears on the corresponding two third rotating shafts are meshed with each other; an annular corrugated groove is provided on the side wall of the annular groove; a sliding column is fixedly connected to the cross plate of the H-shaped plate; the sliding column is slidably connected in the annular corrugated groove.

[0014] Preferably, a base is provided below the bottom plate; one end of the bottom plate is rotatably connected to one side of the base, the other end of the base is hinged with a hydraulic telescopic rod, and the telescopic end of the hydraulic telescopic rod is hinged to the bottom end of the bottom plate.

[0015] The drying method of the crystalline particle drying device for producing 4-trifluoromethylnicotinic acid is adopted, and the steps of the method are as follows: S1: Put the crystal particles into the first drying chamber through the feeding assembly. At this time, the cylinder will rotate through the power assembly. The crystal particles will pass through the sieve holes in the first drying chamber and enter the second drying chamber. Then, the preliminarily screened particles will pass through the sieve holes of the annular partition and enter the third drying chamber. The crystal particles will be screened according to their diameter and enter different drying chambers. S2: Then the heating component is turned on. The heating component raises the temperature in the first drying chamber to the highest, while the temperature in the third drying chamber is the lowest. At the same time, because the diameter of the crystal particles in the first drying chamber is the largest, while the diameter of the crystal particles in the third drying chamber is the smallest, the drying completion time of crystal particles of different sizes can be almost the same. S3: Open the cover plate, collect the crystal particles after the cylinder is dried, and complete the drying.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention discloses a crystalline particle drying device and drying method for producing 4-trifluoromethylnicotinic acid. The crystalline particles are placed into a first drying chamber through a feeding assembly. At this time, the cylinder body is rotated by a power assembly. The crystalline particles enter the second drying chamber through the sieve holes in the first drying chamber. Then, the preliminarily screened particles enter the third drying chamber through the sieve holes in the annular partition. The crystalline particles are screened according to their diameters and enter different drying chambers. After being classified according to their sizes, the heating assembly is started. The heating assembly raises the temperature in the first drying chamber to the highest, while the temperature in the third drying chamber is the lowest. At the same time, because the diameter of the crystalline particles in the first drying chamber is the largest, while the diameter of the crystalline particles in the third drying chamber is the smallest, the drying completion time of crystalline particles of different sizes can be almost the same, thereby avoiding the crystalline particles after drying being in a high-temperature drying environment for a long time. Crystalline particles of different diameters can also be dried simultaneously without multiple heating and drying treatments.

[0017] 2. The crystalline particle drying device and drying method for producing 4-trifluoromethylnicotinic acid described in the present invention, due to the action of the first slider, the annular baffle and the arc block, the annular baffle, the first slider, the arc block, the third rotating shaft, the third annular plate and the fourth annular plate are not in a rotating state. During the rotation of the cylinder, that is, when the first rotating shaft rotates, the first slider is driven to move left and right through the circulating screw, and then the arc block is moved left and right to drive the stirring plate to slide left and right, so as to break up the crystalline particles located at the bottom of the third drying chamber and the fourth drying chamber to avoid agglomeration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 This is a three-dimensional diagram of a crystalline particle drying device for producing 4-trifluoromethylnicotinic acid provided by the present invention; Figure 2 It is a structural schematic diagram of a crystalline particle drying device for producing 4-trifluoromethylnicotinic acid provided by the present invention; Figure 3 It is a cross-section of the cylinder Figure 1 ; Figure 4 It is a cross-section of the cylinder Figure 2 ; Figure 5 It is a cross-section of the cylinder Figure 3 ; Figure 6 It is a cross-section of the cylinder Figure 4 ; Figure 7 It is a stereogram of the sliding shaft; Figure 8 is a stereogram of the third rotation axis; Fig. 9 It is a three-dimensional diagram of the stirring blade.

[0020] In the figure: 1, bottom plate; 11, cylinder; 12, first drying chamber; 13, first annular cavity; 14, annular partition; 15, second drying chamber; 16, third drying chamber; 17, sieve hole; 18, base; 19, hydraulic telescopic rod; 2, servo motor; 21, first rotating shaft; 22, annular gear; 23, first gear; 3, first oil chamber; 31, second oil chamber; 32, third oil chamber; 33, first connecting pipe; 34, second connecting pipe; 35, L-shaped input pipe; 36, oil input block; 361, first annular plate; 37, oil output block; 371, second annular plate; 38, oil output pipe ;4. Feed box;41. Second rotating shaft;42. Auger piece;5. Annular groove;51. First annular through groove;52. Second annular through groove;53. Third annular plate;531. Fourth annular plate;54. Sliding shaft;55. Arc rod;56. Agitating piece;6. Annular baffle;61. Arc block;62. First through groove;63. Circulating screw;64. First slider;65. Inverted U-shaped plate;66. Sharp corner;67. Concave surface;7. Third rotating shaft;71. Support rod;72. Vibrating ball;73. Fourth gear;74. H-shaped plate;75. Teeth;76. Annular corrugated groove;77. Sliding column. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] like Figures 1 to 9As shown, a crystalline particle drying device for manufacturing 4-trifluoromethylnicotinic acid according to an embodiment of the present invention comprises a bottom plate 1; a cylinder 11 is provided on the bottom plate 1; a first drying chamber 12 is provided in the cylinder 11, and both ends of the first drying chamber 12 are provided with openings, and the cross section of the first drying chamber 12 is circular; a first annular cavity 13 is provided in the cylinder 11, and the first annular cavity 13 is provided around the first drying chamber 12; an annular partition 14 is fixedly connected in the first annular cavity 13; the first annular cavity 13 is divided into a second drying chamber 15 and a third drying chamber 16 by the annular partition 14; The third drying chamber 16 is arranged around the second drying chamber 15; a group of sieve holes 17 are opened on the side wall of the first drying chamber 12 and the annular partition 14; the first drying chamber 12 is connected to the second drying chamber 15 through the sieve holes 17 on the side wall of the first drying chamber 12, and the second drying chamber 15 and the third drying chamber 16 are connected through the sieve holes 17 on the annular partition 14; the diameter of the sieve holes 17 on the side wall of the first drying chamber 12 is larger than the diameter of the sieve holes 17 on the annular partition 14; the same end of the second drying chamber 15 and the third drying chamber 16 is provided with an opening The first drying chamber 12 has an opening at one end thereof connected to a feed assembly; the opening at the other end thereof is located at the same end as the openings of the second drying chamber 15 and the third drying chamber 16 and is threadedly connected to a cover plate; a heating assembly is provided in the cylinder 11; the cylinder 11 rotates by a power assembly; in the prior art, when the crude crystals of 4-trifluoromethylnicotinic acid are dried, they are generally placed in a drying oven and dried by electric heating, but there are the following problems: first, during the production of the crystals, the size thereof is not a fixed value, and there are differences in size, When the produced crystal particles are directly placed in the drying oven, at the same drying temperature, the time for complete drying of large and small particles is different. Small particles will be dried first due to their characteristics, but the large crystal particles are not completely dried at this time, so their drying does not stop. Long-term drying will cause the internal structure of small crystal particles to be damaged, affecting the quality of the final product; secondly, when drying after screening, they need to be placed in the drying oven in batches for drying, but the drying oven is heated and dried multiple times, which not only wastes energy, but also greatly reduces the drying efficiency of the entire batch of crystal particles;For this reason, when the present invention is working, the crystal particles are placed into the first drying chamber 12 through the feeding assembly. At this time, the cylinder 11 will be rotated by the power assembly, and the crystal particles will enter the second drying chamber 15 through the sieve hole 17 in the first drying chamber 12. Then, the preliminarily screened particles will enter the third drying chamber 16 through the sieve hole 17 of the annular partition 14. The crystal particles are screened according to the diameter and enter different drying chambers. They are classified according to size, and then the heating assembly is turned on. The heating assembly will make the temperature in the first drying chamber 12 rise to the highest, while the temperature in the third drying chamber 16 is the lowest. At the same time, because the diameter of the crystal particles in the first drying chamber 12 is the largest, and the diameter of the crystal particles in the third drying chamber 16 is the smallest, the drying completion time of crystal particles of different sizes can be almost the same, avoiding the crystal particles after drying being in a high-temperature drying environment for a long time. Crystal particles of different diameters can also be dried at the same time without multiple heating and drying processes. The internal hot air can be extracted through the exhaust assembly, wherein the exhaust assembly and the like are existing technologies, and an exhaust pipe can be provided on the cover plate, which will not be specifically described. ;

[0023] The power assembly includes a servo motor 2; the servo motor 2 is installed on the base plate 1; a first rotating shaft 21 is provided at the output end of the servo motor 2; a first gear 23 is fixedly connected to the first rotating shaft 21; a ring gear 22 is sleeved and fixedly connected to the middle part of the outer wall of the cylinder 11; the first gear 23 and the ring gear 22 are meshed with each other; when working, the servo motor 2 is started, and the first gear 23 and the ring gear 22 are meshed with each other, thereby driving the cylinder 11 to rotate. During the rotation of the cylinder 11, the material can be rolled, which can facilitate the screening and unloading of the material, and also avoid the material from being stationary for a long time, which may cause crystallization and condensation during the drying process, and can also effectively ensure the uniform heating treatment of the heating component.

[0024] The heating assembly includes a plurality of first oil chambers 3; the plurality of first oil chambers 3 are uniformly arranged in the side wall of the first drying chamber 12 along the circumference of the first drying chamber 12; the annular partition plate 14 is provided with a second oil chamber 31 corresponding to the position and number of the first oil chamber 3; the side wall of the third drying chamber 16 is provided with a third oil chamber 32 corresponding to the position and number of the second oil chamber 31; the cylinder 11 is provided with an L-shaped input pipe 35 corresponding to the number of the first oil chambers 3, and one end of the L-shaped input pipe 35 penetrates into the cylinder 11 and communicates with the corresponding first oil chamber 3, and the other end extends out of the cylinder 11; a first connecting pipe 33 is fixedly connected to the position of the second drying chamber 15 near the opening of the second drying chamber 15, and the first connecting pipe 33 communicates with the corresponding first oil chamber 3 and the second oil chamber 31; a second connecting pipe 34 is fixedly connected to the position of the third drying chamber 16 away from the opening of the third drying chamber 16, and the second connecting pipe 34 communicates with the corresponding second oil chamber 31 and the third oil chamber 32; the cylinder The outer wall of the cylinder 11 is fixedly connected to the position of the opening of the third drying chamber 16, and the oil output pipes 38 corresponding to the number of the third oil chambers 32 are connected; the oil output pipes 38 and the corresponding third oil chambers 32 are connected to each other; the bottom plate 1 is fixedly connected to the oil input block 36 through the support column, and the oil input block 36 is annular and arranged around the cylinder 11; the inner wall of the oil input block 36 is rotatably connected to the first annular plate 361, and the first annular plate 361 is connected to all L-shaped input pipes 35 away from the first oil chamber 3, an oil output block 37 is fixedly connected to the bottom plate 1 through a support column, and the oil output block 37 is annular and arranged around the cylinder 11; a second annular plate 371 is rotatably connected to the inner wall of the oil output block 37, and the second annular plate 371 is fixedly connected to all the oil output pipes 38; the oil input block 36 is interconnected with the corresponding first oil chamber 3 through all the L-shaped input pipes 35; the oil output block 37 is interconnected with the corresponding third oil chamber 32 through all the oil output pipes 38;During operation, when heating is required, the high-temperature oil from the outside will first enter the oil input block 36, and then enter the first oil chamber 3 through the L-shaped input pipe 35, and perform the first heat dissipation in the first oil chamber 3 to heat the crystal particles in the first drying chamber 12. At this time, the high-temperature oil is subjected to the first heat dissipation treatment, and the temperature in the first drying chamber 12 is the highest. Then, the oil in the first oil chamber 3 enters the second oil chamber 31 through the first connecting pipe 33, and performs the second flow heat dissipation treatment. The crystal particles in the second drying chamber 15 are dried, and the temperature is the second highest. Then, the oil in the second oil chamber 31 enters the third oil chamber 32 through the second connecting pipe 34, and then performs the third flow heat dissipation treatment. At this time, the crystal particles in the third drying chamber 16 are dried, and the temperature is the lowest. However, due to the screening of the size of the crystal particles through the sieve hole 17, the crystal particles in the first drying chamber 12 are the largest, and the crystal particles in the third drying chamber 16 are the smallest, so that the crystal particles in the three drying chambers can be dried almost at the same time, ensuring the drying quality and drying efficiency of the crystal particles. ;

[0025] The feeding assembly includes a feeding box 4; the feeding box 4 is fixedly connected to the bottom plate 1 through a supporting column; the feeding box 4 is rotatably connected to the end of the cylinder 11 away from the cover plate through a pipeline, and the feeding box 4 is connected to the first drying chamber 12 through the pipeline; a second rotating shaft 41 is rotatably connected in the feeding box 4, and the second rotating shaft 41 enters the first drying chamber 12 through the pipeline; an auger piece 42 is fixedly connected to the second rotating shaft 41, and the outer side walls of the auger piece 42 are respectively close to the pipeline and the inner wall of the first drying chamber 12; the end of the first rotating shaft 21 drives the second rotating shaft 41 to rotate through a transmission member; during operation, when the crystal particles are fed, the second rotating shaft 41 is rotated, and the movement of the crystal particles is driven by the rotation of the auger piece 42. Because at the initial entry, large and small crystal particles enter the first drying chamber 12 first, at this time, through the rotation of the auger piece 42, all the crystal particles are driven to pass through the first drying chamber 12 through the auger piece 42, and then the crystal particles are During the movement, the material can be screened by the rotation of the auger piece 42 and the rotation of the cylinder 11. The final output is large particles, while other crystalline particles are screened during the pushing process, which can effectively ensure uniform distribution in the second drying chamber 15 and the third drying chamber 16, effectively avoiding the crystalline particles from piling up in one position, and the crystalline particles that have passed through once are discharged again through the feed box 4, and are slowly put in so that the number of crystalline particles spaced by the auger piece 42 is basically the same. After the crystalline particles are completely put in, the large particles will be evenly distributed in the first drying chamber 12, and then the servo motor 2 will perform a period of forward and reverse rotation, which can push the crystalline particles in the first drying chamber 12 back and forth and can be screened again, while avoiding the situation of drying and agglomeration, and can also effectively ensure the uniformity of drying, wherein the rotation speed of the second rotating shaft 41 is different from the rotation speed of the cylinder 11, wherein the transmission member can be a sprocket chain, a pulley and a belt or a synchronous wheel and synchronous belt, etc., and the belt can also be an "8" belt.

[0026] An annular groove 5 is provided on the outer wall of the cylinder 11; the ends of the second drying chamber 15 and the third drying chamber 16 away from the cover plate are communicated with the annular groove 5 through the first annular groove 51 and the second annular groove 52 respectively; the third annular plate 53 and the fourth annular plate 531 are rotatably connected in the first annular groove 51 and the second annular groove 52 respectively; the third annular plate 53 and the fourth annular plate 531 are slidably connected through the sliding shaft 54 ​​near the bottom position; a plurality of arc rods 55 are fixedly connected to the two sliding shafts 54 along the setting direction of the sliding shaft 54, and the arc rods 55 on the two sliding shafts 54 are respectively located in the second drying chamber 15 and the third drying chamber 16; a plurality of stirring blades 56 are fixedly connected to the arc rods 55 along the setting direction of the arc rods 55; one end of the two sliding shafts 54 extending into the annular groove 5 is connected to the power unit, and the two sliding shafts 54 slide left and right through the power unit; The power unit includes an annular baffle 6; an annular baffle 6 is rotatably connected to the opening of the annular groove 5; an arc block 61 is slidably connected between the groove bottom of the annular groove 5 and the inner wall of the annular baffle 6; one end of the two sliding shafts 54 extending into the annular groove 5 is fixedly connected to the side wall of the arc block 61; a first through groove 62 is provided on the annular baffle 6; a circulating screw 63 is provided in the middle of the first rotating shaft 21; a first slider 64 is fixedly connected to the arc block 61, and the bottom end of the first slider 64 is connected to the circulating screw 63 through the first through groove 62 and the screw nut pair; an inverted U-shaped plate 65 is fixedly connected to the outer wall of the cylinder 11, and the inverted U-shaped plate 65 spans the opening of the annular groove 5; During operation, as the cylinder 11 rotates, the crystal particles located in the second drying chamber 15 and the third drying chamber 16 are generally located at the bottom. At this time, due to the action of the first slider 64, the annular baffle 6 and the arc block 61, the annular baffle 6, the first slider 64, the arc block 61, the third rotating shaft 7, the third annular plate 53 and the fourth annular plate 531 are not in a rotating state. During the rotation of the cylinder 11, that is, when the first rotating shaft 21 rotates, the first slider 64 will be driven to move left and right through the circulating screw 63, and then the stirring piece 56 will be driven to slide left and right through the left and right movement of the arc block 61, so as to break up the crystal particles located at the bottom of the third drying chamber 16 and the second drying chamber 15 to avoid agglomeration. The first connecting pipe 33 and the second connecting pipe 34 not only play a connecting role, but also have a connecting and supporting role, so the annular partition 14 can maintain a stable state of following the rotation of the cylinder 11.

[0027] The top view of the stirring piece 56 is a quadrilateral, and the four sides of the stirring piece 56 are all concave surfaces 67; the top of the stirring piece 56 is a pointed end; the four corners of the stirring piece 56 are all sharp corners 66, and when the sliding shaft 54 ​​slides left and right, a pair of sharp corners 66 arranged along the diagonal of the stirring piece 56 are opposite to the left and right sliding direction of the sliding shaft 54; when working, the sharp corners 66 can effectively improve the dispersion effect, and at the same time, the top of the stirring piece 56 is a pointed end, which can effectively avoid the accumulation of the screened material on the top of the stirring piece 56 when the material is discharged, and the inner arc surface can effectively increase the contact area with the overall crystal particles while ensuring the comprehensiveness of the dispersion.

[0028] A pair of third rotating shafts 7 are rotatably connected at the top of the third annular plate 53 and the fourth annular plate 531, and each pair of third rotating shafts 7 includes two symmetrically distributed third rotating shafts 7; one end of the two pairs of third rotating shafts 7 extends into the second drying chamber 15 and the third drying chamber 16 respectively; a support rod 71 is fixedly connected to each of the third rotating shafts 7, and a vibration ball 72 is fixedly connected to the end of the support rod 71; the two support rods 71 ​​in a pair of the third rotating shafts 7 are opposite and staggered; one end of each of the third rotating shafts 7 away from the support rod 71 extends into the annular groove 5 and moves through the circulation unit; The circulation unit includes a fourth gear 73; each end of the third rotating shaft 7 located in the annular groove 5 is fixedly connected to the fourth gear 73; the third annular plate 53 and the fourth annular plate 531 are slidably connected to an H-shaped plate 74; a group of teeth 75 are fixedly connected to both sides of the H-shaped plate 74; a group of teeth 75 and the fourth gears 73 on the corresponding two third rotating shafts 7 are meshed with each other; an annular corrugated groove 76 is provided on the side wall of the annular groove 5; a sliding column 77 is fixedly connected to the transverse plate of the H-shaped plate 74; the sliding column 77 is slidably connected in the annular corrugated groove 76; During operation, when the cylinder 11 rotates, the third annular plate 53 and the fourth annular plate 531 are stationary, so the third rotating shaft 7 and the vibrating ball 72 will always be at the highest point. At this time, the cylinder 11 rotates, and the H-shaped plate 74 will be driven to move up and down through the annular corrugated groove 76 and the sliding column 77. Because the teeth 75 are engaged with the corresponding fourth gear 73, the third rotating shaft 7 can be driven to swing in a circle, and then the vibrating ball 72 is used to vibrate the position of the sieve hole 17 to avoid blockage. At the same time, the vibrating ball 72 is made of heat-resistant non-rigid material, and the prior art will not be elaborated.

[0029] A base 18 is provided below the bottom plate 1; one end of the bottom plate 1 is rotatably connected to one side of the base 18, and the other end of the base 18 is hinged with a hydraulic telescopic rod 19, and the telescopic end of the hydraulic telescopic rod 19 is hinged to the bottom end of the bottom plate 1; during operation, after the crystal particles are dried, the cover plate is removed, and the crystal particles in the first drying chamber 12 can be easily discharged by rotating the auger piece 42, while the crystal particles in the second drying chamber 15 and the third drying chamber 16 can be discharged by extending the hydraulic telescopic rod 19 to tilt the bottom plate 1 as a whole, so as to facilitate the discharge of the crystal particles from the second drying chamber 15 and the third drying chamber 16.

[0030] The drying method of the crystalline particle drying device for producing 4-trifluoromethylnicotinic acid is adopted, and the steps of the method are as follows: S1: Put the crystal particles into the first drying chamber 12 through the feeding assembly. At this time, the cylinder 11 will be rotated by the power assembly, and the crystal particles will enter the second drying chamber 15 through the sieve holes 17 in the first drying chamber 12. Then, the preliminarily screened particles will enter the third drying chamber 16 through the sieve holes 17 of the annular partition 14. The crystal particles are screened according to their diameters and enter different drying chambers. S2: Then the heating element is turned on. The heating element raises the temperature in the first drying chamber 12 to the highest temperature, while the temperature in the third drying chamber 16 is the lowest temperature. At the same time, because the diameter of the crystal particles in the first drying chamber 12 is the largest, while the diameter of the crystal particles in the third drying chamber 16 is the smallest, the drying completion time of crystal particles of different sizes can be almost the same. S3: Open the cover plate, collect the crystal particles dried in the cylinder 11, and complete the drying.

[0031] Working principle: put the crystal particles into the first drying chamber 12 through the feeding component, and the cylinder 11 will rotate through the power component at this time, and the crystal particles will enter the second drying chamber 15 through the sieve hole 17 in the first drying chamber 12, and then the preliminarily screened particles will enter the third drying chamber 16 through the sieve hole 17 of the annular partition 14. The crystal particles are screened according to their diameter and enter different drying chambers. They are classified according to their size, and then the heating component is started. The heating component will make the temperature in the first drying chamber 12 rise to the highest, and the temperature in the third drying chamber 16 is the lowest. At the same time, because the diameter of the crystal particles in the first drying chamber 12 is the largest, and the diameter of the crystal particles in the third drying chamber 16 is the smallest, the drying completion time of crystal particles of different sizes can be almost the same, avoiding the crystal particles after drying being in a high-temperature drying environment for a long time, and the crystal particles of different diameters can also be dried at the same time without multiple heating and drying processes; when heating is required, the external high-temperature oil will first enter the oil input block 36, Then, the oil enters the first oil chamber 3 through the L-shaped input pipe 35, and performs the first heat dissipation in the first oil chamber 3 to heat the crystal particles in the first drying chamber 12. At this time, the high-temperature oil performs the first heat dissipation treatment, and the temperature in the first drying chamber 12 is the highest. Then, the oil in the first oil chamber 3 enters the second oil chamber 31 through the first connecting pipe 33 to perform the second flow heat dissipation treatment. At this time, the crystal particles in the second drying chamber 15 are dried, and the temperature is the second highest. Then, the oil in the second oil chamber 31 enters the third oil chamber 32 through the second connecting pipe 34, and performs the third flow heat dissipation treatment. At this time, it is the third heat dissipation treatment, and the crystal particles in the third drying chamber 16 are dried, and the temperature is the lowest. However, due to the size of the crystal particles, the crystal particles in the first drying chamber 12 are the largest, and the crystal particles in the third drying chamber 16 are the smallest. As a result, the crystal particles in the three drying chambers can be dried almost at the same time, thereby ensuring the drying quality and drying efficiency of the crystal particles.When the crystal particles are fed, the second rotating shaft 41 is rotated, and the rotation of the auger piece 42 drives the movement of the crystal particles. Because at the initial entry, both large and small crystal particles enter the first drying chamber 12 first, at this time, the rotation of the auger piece 42 first drives all the crystal particles through the first drying chamber 12. During the movement of the crystal particles, the rotation of the auger piece 42 and the rotation of the cylinder 11 can be used to screen the material. The final output is large particles, while other crystal particles are screened during the pushing process, which can effectively ensure uniform distribution. In the second drying chamber 15 and the third drying chamber 16, the crystal particles are effectively prevented from piling up in one position. The crystal particles that have passed through the first drying chamber are discharged again through the feed box 4 and slowly put in so that the number of crystal particles separated by the auger blade 42 is basically the same. After the crystal particles are completely put in, the large particles will be evenly distributed in the first drying chamber 12. Then, the servo motor 2 is rotated forward and reverse for a period of time, so that the crystal particles in the first drying chamber 12 can be pushed back and forth, and can be screened again, while avoiding the drying and agglomeration, and can also effectively ensure the drying uniformity. ;

[0032] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A crystalline particle drying device for producing 4-trifluoromethylnicotinic acid, characterized in that: The invention comprises a bottom plate (1); a cylinder (11) is provided on the bottom plate (1); a first drying chamber (12) is provided in the cylinder (11), and both ends of the first drying chamber (12) are provided with openings, and the cross section of the first drying chamber (12) is circular; a first annular cavity (13) is provided in the cylinder (11), and the first annular cavity (13) is arranged around the first drying chamber (12); an annular partition (14) is fixedly connected in the first annular cavity (13); the first annular cavity (13) is divided into a second drying chamber (15) and a third drying chamber (16) by the annular partition (14), and the third drying chamber (16) is arranged around the second drying chamber (15); a group of sieve holes (17) are provided on the side wall of the first drying chamber (12) and on the annular partition (14); the first drying chamber (12) is provided with a first sieve hole (17) through a first sieve hole (17) The sieve holes (17) on the side wall of a drying chamber (12) are connected to the second drying chamber (15), and the second drying chamber (15) and the third drying chamber (16) are connected via the sieve holes (17) on the annular partition (14); the diameter of the sieve holes (17) on the side wall of the first drying chamber (12) is larger than the diameter of the sieve holes (17) on the annular partition (14); the second drying chamber (15) and the third drying chamber (16) are both provided with openings at the same end; the opening at one end of the first drying chamber (12) is connected to a feed assembly; the opening at the other end of the first drying chamber (12) is located at the same end as the openings of the second drying chamber (15) and the openings of the third drying chamber (16), and a cover plate is threadedly connected to both ends; a heating assembly is provided in the cylinder (11); and the cylinder (11) is rotated by a power assembly.

2. A crystalline particle drying device for producing 4-trifluoromethylnicotinic acid according to claim 1, characterized in that: The power assembly comprises a servo motor (2); the servo motor (2) is mounted on the base plate (1); a first rotating shaft (21) is provided at the output end of the servo motor (2); a first gear (23) is fixedly connected to the first rotating shaft (21); a ring gear (22) is sleeved and fixedly connected to the middle part of the outer wall of the cylinder (11); the first gear (23) and the ring gear (22) are meshed with each other.

3. A crystalline particle drying device for producing 4-trifluoromethylnicotinic acid according to claim 2, characterized in that: The heating assembly comprises a plurality of first oil chambers (3); the plurality of first oil chambers (3) are evenly arranged in the side wall of the first drying chamber (12) along the circumference of the first drying chamber (12); the annular partition plate (14) is provided with second oil chambers (31) corresponding to the positions and number of the first oil chambers (3); the side wall of the third drying chamber (16) is provided with third oil chambers (32) corresponding to the positions and number of the second oil chambers (31); the cylinder (11) is provided with L-shaped input pipes (35) corresponding to the number of the first oil chambers (3), and the L-shaped input pipes (35) are provided with a plurality of second oil chambers (3) corresponding to the positions and number of the second oil chambers (31). One end of the cylinder (35) extends deep into the cylinder (11) and is connected to the corresponding first oil chamber (3), and the other end extends out of the cylinder (11); a first connecting pipe (33) is fixedly connected to a position in the second drying chamber (15) close to the opening of the second drying chamber (15), and the first connecting pipe (33) is connected to the corresponding first oil chamber (3) and the second oil chamber (31); a second connecting pipe (34) is fixedly connected to a position in the third drying chamber (16) away from the opening of the third drying chamber (16), and the second connecting pipe (34) is connected to the corresponding second oil chamber (31) and the third oil chamber (32); the cylinder An oil output pipe (38) corresponding to the number of the third oil chambers (32) is fixedly connected to the outer wall of the body (11) at a position close to the opening of the third drying chamber (16); the oil output pipe (38) and the corresponding third oil chamber (32) are communicated with each other; an oil input block (36) is fixedly connected to the bottom plate (1) via a support column, and the oil input block (36) is annular and arranged around the cylinder (11); a first annular plate (361) is rotatably connected to the inner wall of the oil input block (36), and the first annular plate (361) is connected to all L-shaped input pipes (35) away from the first oil chamber ( 3), an oil output block (37) is fixedly connected to the bottom plate (1) via a support column, and the oil output block (37) is annular and arranged around the cylinder (11); a second annular plate (371) is rotatably connected to the inner wall of the oil output block (37), and the second annular plate (371) is fixedly connected to all the oil output pipes (38); the oil input block (36) is mutually connected to the corresponding first oil chamber (3) via all the L-shaped input pipes (35); and the oil output block (37) is mutually connected to the corresponding third oil chamber (32) via all the oil output pipes (38).

4. A crystalline particle drying device for producing 4-trifluoromethylnicotinic acid according to claim 3, characterized in that: The feed assembly comprises a feed box (4); the feed box (4) is fixedly connected to the bottom plate (1) via a support column; the feed box (4) is rotatably connected to an end of the cylinder (11) away from the cover plate via a pipeline, and the feed box (4) is connected to the first drying chamber (12) via the pipeline; a second rotating shaft (41) is rotatably connected inside the feed box (4), and the second rotating shaft (41) enters the first drying chamber (12) through the pipeline; an auger piece (42) is fixedly connected to the second rotating shaft (41), and the outer side wall of the auger piece (42) is respectively close to the pipeline and the inner wall of the first drying chamber (12); the end of the first rotating shaft (21) drives the second rotating shaft (41) to rotate via a transmission member.

5. A crystalline particle drying device for producing 4-trifluoromethylnicotinic acid according to claim 4, characterized in that: An annular groove (5) is provided on the outer wall of the cylinder (11); the ends of the second drying chamber (15) and the third drying chamber (16) away from the cover plate are communicated with the annular groove (5) through a first annular groove (51) and a second annular groove (52) respectively; a third annular plate (53) and a fourth annular plate (531) are rotatably connected in the first annular groove (51) and the second annular groove (52) respectively; the third annular plate (53) and the fourth annular plate (531) are both slidably connected at their bottoms. A plurality of arc-shaped rods (55) are fixedly connected to the two sliding shafts (54) along the setting direction of the sliding shafts (54), and the arc-shaped rods (55) on the two sliding shafts (54) are respectively located in the second drying chamber (15) and the third drying chamber (16); a plurality of stirring blades (56) are fixedly connected to the arc-shaped rods (55) along the setting direction of the arc-shaped rods (55); one end of the two sliding shafts (54) extending into the annular groove (5) is connected to a power unit, and the two sliding shafts (54) slide left and right through the power unit.

6. A crystalline particle drying device for producing 4-trifluoromethylnicotinic acid according to claim 5, characterized in that: The power unit comprises an annular baffle (6); an annular baffle (6) is rotatably connected to the opening of the annular groove (5); an arc block (61) is slidably connected between the groove bottom of the annular groove (5) and the inner wall of the annular baffle (6); one end of the two sliding shafts (54) extending into the annular groove (5) is fixedly connected to the side wall of the arc block (61); a first through groove (62) is provided on the annular baffle (6); a circulating lead screw (63) is provided in the middle of the first rotating shaft (21); a first slider (64) is fixedly connected to the arc block (61), and the bottom end of the first slider (64) is connected to the arc block (61) through a first through groove (62 ... A through groove (62) is connected to the circulating screw (63) through a screw nut pair; an inverted U-shaped plate (65) is fixedly connected to the outer wall of the cylinder (11), and the inverted U-shaped plate (65) spans the opening of the annular groove (5); the top view of the stirring piece (56) is a quadrilateral, and the four sides of the stirring piece (56) are all concave surfaces (67); the top of the stirring piece (56) is a pointed tip; the four corners of the stirring piece (56) are all sharp corners (66), and when the sliding shaft (54) slides left and right, a pair of sharp corners (66) arranged along the diagonal line in the stirring piece (56) are opposite to the left and right sliding direction of the sliding shaft (54).

7. A crystalline particle drying device for producing 4-trifluoromethylnicotinic acid according to claim 6, characterized in that: A pair of third rotating shafts (7) are rotatably connected at the top of the third annular plate (53) and the fourth annular plate (531), and each pair of third rotating shafts (7) includes two symmetrically distributed third rotating shafts (7); one end of the two pairs of third rotating shafts (7) extends into the second drying chamber (15) and the third drying chamber (16) respectively; each of the third rotating shafts (7) is fixedly connected to a support rod (71), and a vibration ball (72) is fixedly connected to the end of the support rod (71); the two support rods (71) in a pair of third rotating shafts (7) are opposite to each other and are arranged in an alternating manner; and one end of each of the third rotating shafts (7) away from the support rod (71) extends into the annular groove (5) and moves through the circulation unit.

8. A crystalline particle drying device for producing 4-trifluoromethylnicotinic acid according to claim 7, characterized in that: The circulation unit comprises a fourth gear (73); one end of each of the third rotating shafts (7) located in the annular groove (5) is fixedly connected to the fourth gear (73); an H-shaped plate (74) is slidably connected to the third annular plate (53) and the fourth annular plate 531; a group of teeth (75) is fixedly connected to both sides of the H-shaped plate (74); a group of teeth (75) and the fourth gears (73) on the corresponding two third rotating shafts (7) are meshed with each other; an annular corrugated groove (76) is provided on the side wall of the annular groove (5); a sliding column (77) is fixedly connected to the transverse plate of the H-shaped plate (74); and the sliding column (77) is slidably connected in the annular corrugated groove (76).

9. A crystalline particle drying device for producing 4-trifluoromethylnicotinic acid according to claim 8, characterized in that: A base (18) is provided below the base plate (1); one end of the base plate (1) is rotatably connected to one side of the base (18); the other end of the base (18) is hingedly connected to a hydraulic telescopic rod (19); and the telescopic end of the hydraulic telescopic rod (19) is hingedly connected to the bottom end of the base plate (1).

10. A drying method using the crystalline particle drying device for producing 4-trifluoromethylnicotinic acid according to claim 9, characterized in that: The steps of this method are as follows: S1: The crystal particles are placed into the first drying chamber (12) through the feeding assembly. At this time, the cylinder (11) is rotated by the power assembly, and the crystal particles pass through the sieve holes (17) in the first drying chamber (12) and enter the second drying chamber (15). Then, the preliminarily screened particles pass through the sieve holes (17) of the annular partition (14) and enter the third drying chamber (16). The crystal particles are screened according to their diameters and enter different drying chambers. S2: Then the heating component is turned on. The heating component raises the temperature in the first drying chamber (12) to the highest temperature, while the temperature in the third drying chamber (16) is the lowest temperature. At the same time, because the diameter of the crystal particles in the first drying chamber (12) is the largest, while the diameter of the crystal particles in the third drying chamber (16) is the smallest, the drying completion time of crystal particles of different sizes can be almost the same. S3: Open the cover plate and collect the crystal particles dried in the cylinder (11), thus completing the drying.

Images