Recrystallization device for purifying medicine impurities

Abstract

The utility model discloses a recrystallization device for purifying medicine impurities, and relates to the technical field of medicine impurity removal. The filter screen frame is in contact with the upper side of the chassis; a plurality of extension blocks are distributed and fixed on the circumference of the bottom of the filter screen frame at equal angles, penetrate through the base plate and are exposed on the lower side of the base plate; the four fixing frames are fixedly arranged at the bottom of the base plate in a circumferential equiangular distribution mode. The four driving motors are fixedly arranged on one side of the fixing frame. The output end of the driving motor is arranged in the fixing frame after passing through the inner wall of one side of the fixing frame; the bidirectional screw rod is connected with the output end of the driving motor; the two-way lead screw is sleeved with two oppositely-arranged inserting frames through two oppositely-arranged threads on the two-way lead screw in a screwed connection mode, and the inserting ends of the inserting frames are inserted into the extending blocks. The two layers of filter screen rings are combined to form a filter screen frame, and activated carbon is placed in the filter screen frame; the active carbon is replaced by dismounting the net rack; therefore, the impurity removal efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drug impurity removal, in particular to a recrystallization device for purifying drug impurities. Background Art

[0002] In the process of drug production, due to various reasons, insoluble powder impurities are often mixed into the drug and are difficult to remove. In order to avoid the influence of impurities on the drug, the drug must be treated for storage; recrystallization is usually used to store the drug, that is, the crystal is dissolved in a solvent or melted, and then crystallized again from the solution or melt; the existing operation requires stirring the drug and the solution to dissolve the drug during impurity removal; a recrystallization device for purifying drug impurities is disclosed in the patent announcement number CN219721963U; it is disclosed that the impurity removal tank is driven to rotate while stirring to achieve centrifugal impurity removal to improve the impurity removal efficiency; the stirring rod drives the connecting rod to rotate and stir during the rotation process, and drives the brush to scrape the inside of the filter screen to prevent impurities from clogging the mesh during the flow of the drug liquid; however, since the filter screen is two circles and fixed on the support plate, the activated carbon is arranged between the two filter screens. After the activated carbon is used for a period of time, it cannot be replaced, which affects the impurity removal effect. Utility Model Content

[0003] The purpose of the utility model is to provide a recrystallization device for purifying drug impurities with a simple structure, reasonable design and easy use in view of the defects and shortcomings of the prior art. Two layers of filter mesh rings are combined to form a filter mesh frame, and activated carbon is placed inside the mesh frame; the activated carbon can be replaced by disassembling the mesh frame; thereby improving the impurity removal efficiency.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows: it comprises a frame, a de-impurity tank and a crystallization tank, the upper side of the frame is provided with a de-impurity tank and a crystallization tank in sequence from left to right, and a connecting pipe is provided between the de-impurity tank and the crystallization tank; a rotating motor is provided at the bottom of the frame, and the output end of the rotating motor passes through the frame, the bottom of the de-impurity tank and the horizontal frame inside the de-impurity tank in sequence from bottom to top, and is provided inside the de-impurity tank; a chassis is provided inside the de-impurity tank, the chassis is provided on the upper side of the horizontal frame, and the output end of the rotating motor is fixed to the bottom of the chassis; a cover plate is provided on the upper side of the de-impurity tank, a stirring motor is provided on the cover plate, and a stirring rod is provided after the output end of the stirring motor passes through the cover plate;

[0005] It also contains:

[0006] The filter rack is arranged on the upper side of the bottom plate; and a plurality of extension blocks are fixed at equal angles on the bottom circumference of the filter rack, and the extension blocks are exposed on the lower side of the bottom plate after passing through the bottom plate;

[0007] The fixing frames are four in number and are fixedly arranged at the bottom of the chassis at equal angles in a circle, and the fixing frames are arranged at the outside of the extension block;

[0008] Drive motors, there are four drive motors, which are respectively fixed on one side of the fixing frame, and the drive motors are connected to an external power supply; and the output end of the drive motor passes through the inner wall of one side of the fixing frame and is arranged inside the fixing frame;

[0009] Bidirectional screw rods, wherein there are four bidirectional screw rods, which are respectively arranged in corresponding fixing frames, and the bidirectional screw rods are connected to the output end of the driving motor; the bidirectional screw rods are provided with two oppositely arranged plug-in racks through two oppositely arranged threaded screw sleeves thereon, the plug-in racks are arranged in contact with the inner wall of one side of the fixing frame, and the plug-in end of the plug-in rack is inserted into the extension block;

[0010] Through the above technical solution design, the activated carbon is placed inside the filter frame, and the filter frame is installed on the chassis by driving the plug-in rack and clamping the extension block; the plug-in rack is moved in the opposite direction away from the extension block, and the filter frame can be dragged upward and away from the impurity removal tank to replace the activated carbon.

[0011] As a further improvement of the utility model, a boss is provided on the right side of the cover plate, a convex block is provided on the upper right end of the impurity removal tank, a steering motor is fixedly provided at the bottom of the convex block, and the steering motor is connected to an external power supply; the output end of the steering motor passes through the convex block and is connected to the boss; a central circular groove is provided inside the cover plate, a round table is provided on the upper side of the cover plate, the stirring motor is fixedly provided at the middle part of the upper side of the round table, and the stirring rod passes through the central circular groove and is provided inside the filter rack; a lifting assembly is provided between the round table and the cover plate;

[0012] Through the above technical solution design, the lifting assembly drives the round table to move. When the round table is moved upward away from the cover plate, the stirring rod is away from the filter frame and can be driven by the steering motor to rotate away from the impurity removal tank. The filter frame can be disassembled to replace the activated carbon. Conversely, after replacement, the steering motor drives the cover plate to be placed on the upper side of the impurity removal tank, and drives the round table to move downward through the lifting assembly until the round table contacts the cover plate and the stirring rod is placed in the filter frame.

[0013] As a further improvement of the present invention, the lifting assembly comprises:

[0014] A lifting motor, which is fixedly arranged on the upper right side of the cover plate and connected to an external power supply;

[0015] A rotating ring, wherein the rotating ring is screwed into an annular groove formed on the upper side of the cover plate through a bearing, a gear ring is formed on the upper side of the rotating ring, an outer ring wall of the gear ring is provided with external teeth, and an inner ring wall of the gear ring is provided with internal teeth;

[0016] The rotating shaft is arranged on the right side of the rotating ring, and the bottom end of the rotating shaft is screwed in the annular groove through a bearing, and a driving gear is sleeved and fixed on the rotating shaft, and the driving gear is meshed with the outer teeth of the gear ring; the upper end of the rotating shaft is connected to the output end of the lifting motor through a bevel gear set;

[0017] Auxiliary gears, there are four auxiliary gears, which are arranged in an annular groove at equal angles around the circumference and meshed with the inner teeth of the gear ring; an auxiliary shaft is passed through and fixed inside the auxiliary gears, the bottom end of the auxiliary shaft is screwed in the annular groove through a bearing, a screw is arranged at the upper end of the auxiliary shaft, and the screw is provided with a protrusion through a threaded screw sleeve, and the protrusion is fixed to the outer ring wall of the truncated table;

[0018] Through the above technical solution design, the bevel gear set drives the driving gear to rotate, so that the driving gear rotates, drives the rotating ring to rotate the auxiliary gear, and the screw drives the protrusion to change the height of the frustum.

[0019] As a further improvement of the utility model, a limiting platform is provided at the upper end of the screw;

[0020] Through the above technical solution design, the movement of the protrusion is limited.

[0021] As a further improvement of the utility model, a through groove is symmetrically opened on the inner side of the annular groove, and an arc block is slidably penetrated in the through groove, and the upper end of the arc block is connected to the bottom of the truncated table;

[0022] Through the above technical solution design, the movement of the round table is guided.

[0023] The working principle of the utility model is as follows: when it is necessary to place medicine in the impurity removal tank, the round table needs to be raised upwards first until the stirring rod is separated from the filter mesh frame; then, the steering motor is started to drive the cover plate to rotate as a whole away from the impurity removal tank, and the medicine is placed inside the filter mesh frame; then, the cover plate can be rotated to be placed on the upper end of the impurity removal tank, and then the round table can be driven to move downwards and cover the cover plate, so that the stirring rod is placed inside the filter mesh frame for stirring operation;

[0024] After stirring, when the activated carbon inside the filter rack needs to be processed, it is still necessary to drive the round table upward again to make the stirring rod away from the filter rack, and then drive the cover plate to rotate away from the impurity removal tank; start the drive motors on the four sides to rotate synchronously, so that the two-way screw rod rotates to drive the rack to move, detach from the extension block, and manually take out the filter rack to replace the activated carbon; after replacement, place the filter rack on the chassis, and after the extension block is inserted into the chassis, the drive motor is rotated in the opposite direction to make the rack tightly inserted into the extension block for continued use.

[0025] After adopting the above structure, the utility model has the following beneficial effects:

[0026] 1. Combine the two original filter screens to form a complete filter screen frame to support the activated carbon, and stabilize the filter screen frame on the chassis by limiting the extension block, so that the filter screen frame and the chassis become one for rotation and stirring operation;

[0027] 2. A central circular groove is opened inside the cover plate, and a truncated table is set just above the central circular groove. The position of the stirring rod can be changed by driving the truncated table to facilitate the rotation of the cover plate, so as to facilitate the disassembly and installation of the filter frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of the utility model.

[0030] Figure 2 yes Figure 1 Schematic diagram of the southeast isometric structure.

[0031] Figure 3 It is a structural schematic diagram of the filter mesh frame, the chassis and the cross frame in the utility model.

[0032] Figure 4 yes Figure 3 Enlarged view of part A.

[0033] Figure 5 It is a structural schematic diagram of the cover plate in the utility model.

[0034] Figure 6 It is a structural schematic diagram of the connection between the cover plate and the round table in the utility model.

[0035] Figure 7 yes Figure 6 Enlarged view of part B.

[0036] Figure 8 It is a structural schematic diagram of a specific implementation method in which the cover plate rotates away from the impurity removal tank.

[0037] Description of reference numerals:

[0038] Frame 1, impurity removal tank 2, crystallization tank 3, rotating motor 4, chassis 5, cover plate 6, center circular groove 6-1, annular groove 6-2, through groove 6-3, stirring motor 7, stirring rod 8, filter rack 9, extension block 10, fixed frame 11, drive motor 12, bidirectional screw rod 13, plug-in frame 14, boss 15, convex block 16, steering motor 17, round table 18, lifting assembly 19, lifting motor 19-1, rotating ring 19-2, gear ring 19-3, rotating shaft 19-4, driving gear 19-5, bevel gear set 19-6, auxiliary gear 19-7, screw 19-8, protrusion 19-9, limit table 19-10, arc block 19-11. DETAILED DESCRIPTION

[0039] The utility model is further described below in conjunction with the accompanying drawings.

[0040] Embodiment 1:

[0041] See also Figure 1-Figure 8 , this embodiment comprises a frame 1, a de-impurity tank 2, and a crystallization tank 3, wherein the de-impurity tank 2 and the crystallization tank 3 are arranged on the upper side of the frame 1 from left to right in sequence, and a connecting pipe is arranged between the de-impurity tank 2 and the crystallization tank 3; a rotating motor 4 is arranged at the bottom of the frame 1, and the output end of the rotating motor 4 passes through the frame 1, the bottom of the de-impurity tank 2, and the cross frame inside the de-impurity tank 2 in sequence from bottom to top, and is arranged inside the de-impurity tank 2; a chassis 5 is arranged inside the de-impurity tank 2, and the chassis 5 is arranged on the upper side of the cross frame, and the output end of the rotating motor 4 is fixed to the bottom of the chassis 5; a cover plate 6 is arranged on the upper side of the de-impurity tank 2, and a stirring motor 7 is arranged on the cover plate 6, and a stirring rod 8 is arranged after the output end of the stirring motor 7 passes through the cover plate 6;

[0042] It also contains:

[0043] The filter frame 9 is arranged on the upper side of the bottom plate 5; and a plurality of extension blocks 10 are fixed at equal angles on the bottom circumference of the filter frame 9, and the extension blocks 10 are exposed on the lower side of the bottom plate 5 after passing through the bottom plate 5;

[0044] The fixing frames 11 are four in number and are fixedly arranged at the bottom of the chassis 5 at equiangular distribution around the circumference, and the fixing frames 11 are arranged at the outside of the extension block 10;

[0045] The driving motors 12 are four in number and are fixedly disposed on one side of the fixing frame 11, respectively. The driving motors 12 are connected to an external power source. The specific models of the driving motors 12 are purchased and installed directly from the market according to actual use requirements. The output end of the driving motor 12 is disposed inside the fixing frame 11 after passing through the inner wall of one side of the fixing frame 11.

[0046] Bidirectional screw rods 13, there are four bidirectional screw rods 13, which are respectively arranged in the corresponding fixing frames 11, and the bidirectional screw rods 13 are connected to the output end of the driving motor 12; the bidirectional screw rods 13 are provided with two oppositely arranged plug-in frames 14 through two oppositely arranged threaded screw sleeves thereon, the plug-in frames 14 are arranged in contact with the inner wall of one side of the fixing frame 11, and the plug-in end of the plug-in frame 14 is inserted into the extension block 10;

[0047] With the above-mentioned design, the activated carbon is placed inside the filter frame 9, and the filter frame 9 is installed on the chassis 5 by driving the insert frame 14 and clamping the extension block 10; the insert frame 14 is moved in the opposite direction away from the extension block 10, and the filter frame 9 can be dragged upward and away from the impurity removal tank 2 to replace the activated carbon.

[0048] Embodiment 2:

[0049] See also Figure 1-Figure 8 , further improved on the basis of Example 1, a boss 15 is provided on the right side of the cover plate 6, a convex block 16 is provided on the upper right end of the impurity removal tank 2, a steering motor 17 is fixedly provided at the bottom of the convex block 16, the steering motor 17 is connected to an external power supply, and the specific use model of the steering motor 17 is directly purchased and installed from the market according to actual use requirements; the output end of the steering motor 17 passes through the convex block 16 and is connected to the boss 15; a central circular groove 6-1 is provided inside the cover plate 6, a round table 18 is provided on the upper side of the cover plate 6, the stirring motor 7 is fixedly provided at the middle part of the upper side of the round table 18, and the stirring rod 8 passes through the central circular groove 6-1 and is provided inside the filter rack 9; a lifting component 19 is provided between the round table 18 and the cover plate 6;

[0050] With the above-mentioned design scheme, the lifting assembly 19 drives the round table 18 to move. When the round table 18 moves upward away from the cover plate 6, the stirring rod 8 moves away from the filter frame 9 and can be driven by the steering motor 17 to rotate away from the impurity removal tank 2, so that the filter frame 9 can be disassembled to replace the activated carbon; conversely, after replacement, the steering motor 17 drives the cover plate 6 to be placed on the upper side of the impurity removal tank 2, and drives the round table 18 to move downward through the lifting assembly 19 until the round table 18 contacts the cover plate 6 and the stirring rod 8 is placed in the filter frame 9.

[0051] Embodiment 3:

[0052] See also Figure 1-Figure 8 , further improved on the basis of Example 2, the lifting assembly 19 comprises:

[0053] Lifting motor 19-1, the lifting motor 19-1 is fixedly arranged on the upper right side of the cover plate 6, and the lifting motor 19-1 is connected to an external power supply; the specific use model of the lifting motor 19-1 is directly purchased and installed from the market according to actual use requirements;

[0054] A rotating ring 19-2 is screwed to the annular groove 6-2 on the upper side of the cover plate 6 through a bearing, and a gear ring 19-3 is arranged on the upper side of the rotating ring 19-2, and an outer ring wall of the gear ring 19-3 is provided with outer teeth, and an inner ring wall of the gear ring 19-3 is provided with inner teeth; a through groove 6-3 is symmetrically opened on the inner side of the annular groove 6-2, and an arc block 19-11 is slidably penetrated in the through groove 6-3, and the upper end of the arc block 19-11 is connected to the bottom of the truncated table 18;

[0055] Rotating shaft 19-4, the rotating shaft 19-4 is arranged on the right side of the rotating ring 19-2, and the bottom end of the rotating shaft 19-4 is screwed in the annular groove 6-2 through a bearing, and a driving gear 19-5 is sleeved and fixed on the rotating shaft 19-4, and the driving gear 19-5 is meshed with the outer teeth of the gear ring 19-3; the upper end of the rotating shaft 19-4 is connected to the output end of the lifting motor 19-1 through a bevel gear set 19-6;

[0056] Auxiliary gears 19-7, there are four auxiliary gears 19-7, which are arranged in the annular groove 6-2 at equal angles around the circumference and meshed with the internal teeth of the gear ring 19-3; and an auxiliary shaft is passed through and fixed inside the auxiliary gear 19-7, the bottom end of the auxiliary shaft is screwed in the annular groove 6-2 through a bearing, and a screw rod 19-8 is arranged on the upper end of the auxiliary shaft, and the screw rod 19-8 is provided with a protrusion 19-9 through a threaded screw sleeve, and the protrusion 19-9 is fixed to the outer ring wall of the round table 18; a limit platform 19-10 is arranged on the upper end of the screw rod 19-8;

[0057] With the above design, the bevel gear set 19-6 drives the driving gear 19-5 to rotate, so that the driving gear 19-5 rotates, drives the rotating ring 19-2 to rotate the auxiliary gear 19-7, and drives the screw 19-8 to drive the protrusion 19-9 to change the height of the table 18.

[0058] When using the utility model, when it is necessary to place medicine in the impurity removal tank 2, it is necessary to first raise the round table 18 upward until the stirring rod 8 is separated from the filter rack 9; then, start the steering motor 17 to drive the cover plate 6 to rotate away from the impurity removal tank 2 as a whole, and place the medicine inside the filter rack 9; then, the cover plate 6 can be rotated to be placed on the upper end of the impurity removal tank 2, and then the round table 18 can be driven to move downward to cover the cover plate 6, so that the stirring rod 8 is placed inside the filter rack 9 for stirring operation;

[0059] After stirring, when the activated carbon inside the filter rack 9 needs to be processed, it is still necessary to drive the round table 18 to move upward again to make the stirring rod 8 away from the filter rack 9, and then drive the cover plate 6 to rotate away from the impurity removal tank 2; start the driving motors 12 on the four sides to rotate synchronously, so that the two-way screw rod 13 rotates to drive the rack 14 to move, detach from the extension block 10, and manually take out the filter rack 9 to replace the activated carbon; after replacement, place the filter rack 9 on the chassis 5, and after the extension block 10 is inserted into the chassis 5, the driving motor 12 is rotated in the opposite direction to make the rack 14 tightly inserted into the extension block 10 for continued use.

[0060] After adopting the above structure, the beneficial effects of this specific implementation are:

[0061] 1. Combine the two circles of filter screens originally used to form a complete filter screen frame 9 to support the activated carbon, and stabilize the filter screen frame 9 on the chassis 5 by limiting the extension block 10, so that the filter screen frame 9 and the chassis 5 become one body for rotation and stirring operation;

[0062] 2. A central circular groove 6-1 is formed inside the cover plate 6, and a truncated platform 18 is arranged just above the central circular groove 6-1. The truncated platform 18 is driven to change the position of the stirring rod 8, so as to facilitate the rotation of the cover plate 6 and the disassembly and installation of the filter frame 9.

[0063] The above description is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A recrystallization device for purifying drug impurities, comprising a frame (1), an impurity removal tank (2), and a crystallization tank (3), wherein the impurity removal tank (2) and the crystallization tank (3) are arranged on the upper side of the frame (1) from left to right in sequence, and a connecting pipe is arranged between the impurity removal tank (2) and the crystallization tank (3); a rotating motor (4) is arranged at the bottom of the frame (1), and the output end of the rotating motor (4) passes through the frame (1), the bottom of the impurity removal tank (2), and the cross frame inside the impurity removal tank (2) in sequence from bottom to top, and is arranged inside the impurity removal tank (2); a chassis (5) is arranged inside the impurity removal tank (2), the chassis (5) is arranged on the upper side of the cross frame, and the output end of the rotating motor (4) is fixed to the bottom of the chassis (5); a cover plate (6) is arranged on the upper side of the impurity removal tank (2), and a stirring motor (7) is arranged on the cover plate (6), and a stirring rod (8) is arranged on the output end of the stirring motor (7) after passing through the cover plate (6); It is characterized in that It also contains: A filter rack (9), the filter rack (9) being arranged in contact with the upper side of the bottom plate (5); and a plurality of extension blocks (10) being fixed at equal angles on the bottom circumference of the filter rack (9), the extension blocks (10) passing through the bottom plate (5) being exposed on the lower side of the bottom plate (5); A fixing frame (11), wherein the fixing frames (11) are four in number and are fixedly arranged at the bottom of the chassis (5) in a circular equiangular distribution, and the fixing frames (11) are arranged at the outside of the extension block (10); The number of the driving motors (12) is four and they are fixedly arranged on one side of the fixing frame (11), and the driving motors (12) are connected to an external power source; and the output end of the driving motor (12) passes through the inner wall of one side of the fixing frame (11) and is arranged inside the fixing frame (11); A bidirectional screw rod (13), wherein the bidirectional screw rod (13) is four in number and is respectively arranged in a corresponding fixed frame (11), and the bidirectional screw rod (13) is connected to the output end of the driving motor (12); two oppositely arranged plug-in frames (14) are arranged on the bidirectional screw rod (13) through two oppositely arranged threaded screw sleeves thereon, the plug-in frames (14) are arranged in contact with an inner wall of one side of the fixed frame (11), and the plug-in end of the plug-in frame (14) is plugged into the extension block (10).

2. A recrystallization device for purifying drug impurities according to claim 1, characterized in that: The right side of the cover plate (6) is provided with a boss (15), the upper right end of the impurity removal tank (2) is provided with a convex block (16), the bottom of the convex block (16) is fixedly provided with a steering motor (17), and the steering motor (17) is connected to an external power supply; the output end of the steering motor (17) passes through the convex block (16) and is connected to the boss (15); a central circular groove (6-1) is provided inside the cover plate (6), a round table (18) is provided on the upper side of the cover plate (6), the stirring motor (7) is fixedly provided at the middle part of the upper side of the round table (18), and the stirring rod (8) passes through the central circular groove (6-1) and is provided inside the filter mesh frame (9); a lifting assembly (19) is provided between the round table (18) and the cover plate (6).

3. A recrystallization device for purifying drug impurities according to claim 2, characterized in that: The lifting assembly (19) comprises: A lifting motor (19-1), the lifting motor (19-1) is fixedly arranged on the upper right side of the cover plate (6), and the lifting motor (19-1) is connected to an external power supply; A rotating ring (19-2), wherein the rotating ring (19-2) is screwed to an annular groove (6-2) provided on the upper side of the cover plate (6) through a bearing, a gear ring (19-3) is provided on the upper side of the rotating ring (19-2), an outer ring wall of the gear ring (19-3) is provided with external teeth, and an inner ring wall of the gear ring (19-3) is provided with internal teeth; A rotating shaft (19-4), wherein the rotating shaft (19-4) is arranged on the right side of the rotating ring (19-2), and the bottom end of the rotating shaft (19-4) is screwed into the annular groove (6-2) through a bearing, and a driving gear (19-5) is sleeved and fixed on the rotating shaft (19-4), and the driving gear (19-5) is meshed with the outer teeth of the gear ring (19-3); the upper end of the rotating shaft (19-4) is connected to the output end of the lifting motor (19-1) through a bevel gear set (19-6); Auxiliary drive gears (19-7), wherein there are four auxiliary drive gears (19-7), which are arranged in an annular groove (6-2) at equal angles around the circumference and meshed with the internal teeth of the gear ring (19-3); and an auxiliary drive shaft is passed through and fixed to the interior of the auxiliary drive gear (19-7), the bottom end of the auxiliary drive shaft is screwed in the annular groove (6-2) through a bearing, and a screw rod (19-8) is arranged at the upper end of the auxiliary drive shaft, and the screw rod (19-8) is provided with a protrusion (19-9) through a threaded screw sleeve, and the protrusion (19-9) is fixed to the outer ring wall of the truncated table (18).

4. A recrystallization device for purifying drug impurities according to claim 3, characterized in that: A limiting platform (19-10) is arranged at the upper end of the screw rod (19-8).

5. A recrystallization device for purifying drug impurities according to claim 3, characterized in that: A through groove (6-3) is symmetrically provided on the inner side of the annular groove (6-2) and penetrates therethrough. An arc block (19-11) is slidably provided in the through groove (6-3). The upper end of the arc block (19-11) is connected to the bottom of the truncated table (18).

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