Medicine sample grinding device for medicine detection

Abstract

The invention relates to the technical field of medicine detection auxiliary equipment, and discloses a medicine sample grinding device for medicine detection, which realizes full grinding of medicine samples, improves the efficiency, reduces the operation intensity and ensures that the fineness of the medicine samples meets the detection requirements. A feeding pipe is arranged on one side of the shell, a collecting box is arranged on the bottom face in the shell, a filter screen drum with the two open ends is rotationally connected into the shell and rotationally matched with the shell through a first bearing and a second bearing, and the interior of the end, away from the feeding pipe, of the filter screen drum is connected and fixed to a circular plate of the shell through a third bearing. The driving assembly synchronously drives the filter screen drum and the grinding roller assembly in the drum; a plurality of groups of return plates are arranged on the inner wall of the filter screen drum; medicine samples enter the filter screen drum through the feeding pipe, the driving assembly drives the grinding roller assembly to grind the samples, qualified particles enter the collecting box through the screen drum, and coarse particles are sent back to the grinding roller assembly through the material returning plate to be ground again.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drug detection auxiliary equipment, in particular to a drug sample grinding device for drug detection. BACKGROUND

[0002] In the field of drug research and development, production quality control and drug detection, accurate grinding of drug samples is a key pre-step for subsequent detection work such as component analysis and content determination, and the grinding fineness of drug samples directly determines the accuracy and reliability of the detection results. At present, the commonly used drug sample grinding devices in the industry mainly include traditional manual grinding equipment, single-roller grinding machines and ordinary multi-roller grinding equipment, etc. The traditional manual grinding equipment relies on the strength and experience of the operator, and not only has very low grinding efficiency, which is difficult to meet the detection needs of batch drug samples, but also the grinding force and grinding uniformity are difficult to control, and it is easy to appear insufficient grinding or excessive grinding, which leads to large particle size difference of drug samples, seriously affecting the accuracy of subsequent detection data. The single-roller grinding machine realizes grinding through the extrusion action between the single grinding roller and the fixed lining plate, but its grinding method is single, and it can only grind the drug samples once. For drug samples with high hardness or high toughness, it is often difficult to meet the fineness requirements for detection, and the coarse particles that do not pass through the screen during the grinding process are easy to accumulate at the bottom of the equipment, which needs to be cleaned regularly and re-put into grinding manually, which is tedious and further reduces the grinding efficiency. Although the ordinary multi-roller grinding equipment has improved the grinding efficiency, it usually lacks effective coarse particle backflow grinding mechanism. During the grinding operation, the coarse particles that do not meet the fineness requirements after multi-roller grinding are mostly directly deposited at the bottom of the equipment or attached to the surface of the screen. If not handled in time, it will not only cause screen jamming, affecting the screening and collection of qualified particles, but also need to be cleaned and re-fed manually, increasing the work intensity of the operators and prolonging the overall grinding operation cycle. In addition, some grinding equipment with simple backflow structure has unreasonable design of the backflow part, either cannot accurately send the coarse particles back to the grinding area, or causes sample loss during the backflow process, further affecting the grinding efficiency and sample utilization rate. SUMMARY

[0003] The purpose of the present application is to solve the problems raised in the background art, and to provide a drug sample grinding device for drug detection.

[0004] The technical solution adopted by the present application to solve its technical problems is: The utility model provides a medicine sample grinding device for medicine detection, which comprises a shell, one side of the shell is provided with a feeding pipe, the inner bottom surface of the shell is provided with a collecting box with an open top surface, and the other side opposite to the feeding pipe is provided with a round opening; a filter screen cylinder with open ends is rotatably connected in the shell, one end of the filter screen cylinder is connected with the feeding pipe and connected with a first bearing embedded and installed in the inner part of the shell, and the other end is connected with a second bearing installed in the round opening; a circular plate is connected with the other end of the filter screen cylinder through a third bearing, and the circular plate is connected with one side of the inner part of the shell through a fixing rod, so that the circular plate is always in a fixed and stationary state when the filter screen cylinder rotates; a driving assembly is installed on the circular plate, the driving assembly is connected with the filter screen cylinder and a grinding roller assembly in the inner part of the filter screen cylinder, so that the driving assembly can drive the filter screen cylinder and the grinding roller assembly to rotate simultaneously; a plurality of groups of material returning plates are arranged on the circumference of the filter screen cylinder, so that the medicine samples that are ground by the grinding roller assembly and have not fallen from the filter screen cylinder screen hole can be brought back to the grinding roller assembly position again for grinding under the rotating state of the filter screen cylinder.

[0005] Further, the driving assembly comprises a first rotating roller, a second rotating roller and a third rotating roller rotatably arranged on the circular plate, and the other ends of the first rotating roller, the second rotating roller and the third rotating roller are rotatably connected with one side of the shell; a first gear is installed on the first rotating roller; a second gear meshing with the first gear and a third gear coaxial with the second gear are installed on the second rotating roller; a fourth gear meshing with the third gear is installed on the third rotating roller; and the fourth gear meshes with a fifth gear arranged on the filter screen cylinder.

[0006] Further, the grinding roller assembly comprises a first grinding shaft arranged in the inner part of the shell and connected with the first rotating roller, a second grinding shaft connected with the second rotating roller, and a third grinding shaft connected with the third rotating roller; a grinding channel is formed between the first grinding shaft and the second grinding shaft; the third grinding shaft is directly below the grinding channel, and a plurality of strip brushes for contacting the first grinding shaft and the second grinding shaft are arranged on the third grinding shaft.

[0007] Further, the third grinding shaft and the third rotating roller are both hollow structures and are connected in communication; a plurality of nozzles are arranged on the circumference of the third grinding shaft; and a rotating joint for connecting with an external water inlet is coaxially installed on the third rotating roller, so as to improve the cleaning effect of the components.

[0008] Further, a cleaning brush is arranged in the shell, and the cleaning brush is in contact with the outer surface of the filter screen cylinder under the rotating state of the filter screen cylinder, so as to improve the cleaning effect of the filter screen cylinder.

[0009] Further, the return plate is in V-shaped structure to ensure that the coarse particles are stably contained and synchronously upwardly conveyed, so as to reduce the omission rate of the coarse particles in the return process, avoid the waste caused by the unfirm grabbing, and ensure that all the coarse particles can be brought back to the grinding area for reprocessing.

[0010] Further, the fixed rod is between the discharge port of the feeding pipe and the grinding channel, so that the sample is more dispersed and uniform when entering the grinding channel.

[0011] Further, the shell is internally provided with a tapered centralized discharge hopper between the filter screen cylinder and the collection box, so as to improve the discharge effect of the material particles after being screened by the filter screen cylinder.

[0012] Compared with the prior art, the present application has the following advantages: 1. The driving assembly synchronously drives the filter screen cylinder and the internal grinding roller assembly to rotate, the drug sample enters the filter screen cylinder, and the preliminary grinding is realized through the extrusion and shearing action of the grinding roller assembly, and the rotation of the filter screen cylinder throws the ground particles to the cylinder wall, so that the qualified particles are quickly screened; more importantly, a plurality of return plates are arranged on the inner wall of the filter screen cylinder, which can accurately bring the coarse particles that do not pass through the screen hole upward during the rotation of the filter screen cylinder, and the coarse particles fall again when moving to the working area of the grinding roller assembly, so that the coarse particles are ground twice or more times; the problem of insufficient single grinding of the existing equipment is solved, and all drug samples can reach the required fineness for detection, thereby providing a solid guarantee for the accuracy of the subsequent detection results.

[0013] 2. The driving assembly synchronously drives the filter screen cylinder and the grinding roller assembly to operate, which greatly shortens the overall cycle of grinding and screening compared with the step-by-step operation of the traditional equipment; on the other hand, the return plate realizes the automatic return grinding of the coarse particles, without the need for manual shutdown cleaning and secondary feeding, which not only reduces the working intensity of the operator, but also avoids the idle time of the equipment caused by manual operation, thereby significantly improving the continuous operation capacity and overall grinding efficiency of the equipment.

[0014] 3. The circular plate is fixedly connected with the inner wall of the shell through the fixed rod, and is frictionlessly connected with the filter screen cylinder through the third bearing, which not only ensures the stability of the circular plate as the installation carrier of the driving assembly, but also avoids the interference of the filter screen cylinder rotation on the circular plate, thereby ensuring the stability and reliability of the transmission of the driving assembly.

[0015] 4. The overall structure of the equipment is compact, the drug sample is only needed to be put into the feeding pipe, and the whole process of grinding, screening, coarse particle return and qualified sample collection can be completed by starting the driving assembly, so that the operation process is simple and easy to understand. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a schematic diagram of the installation position of the feeding pipe; Figure 3 is a schematic diagram of the installation position of the driving assembly; Figure 4 is a schematic diagram of the position of the round port; Figure 5 is a schematic diagram of the installation position of the round plate; Figure 6 is a schematic diagram of the installation position of the round plate; Figure 1 is a partial enlarged structural schematic diagram of A in the middle; Wherein: 1, the shell; 11, the feeding pipe; 12, the collection box; 13, the round port; 2, the filter screen cylinder; 21, the first bearing; 22, the second bearing; 23, the third bearing; 24, the round plate; 25, the fixed rod; 3, the driving assembly; 31, the first rotating roller; 32, the second rotating roller; 33, the third rotating roller; 34, the first gear; 35, the second gear; 36, the third gear; 37, the fourth gear; 38, the fifth gear; 4, the grinding roller assembly; 41, the first grinding shaft; 42, the second grinding shaft; 43, the third grinding shaft; 44, the strip brush; 45, the spray head; 46, the rotary joint; 47, the cleaning brush; 5, the return plate; 6, the centralized discharge hopper. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application. The present application is further illustrated in conjunction with the drawings and embodiments: A medicine sample grinding device for medicine detection, with reference to the drawings Figure 1 - the drawings Figure 6As shown, including the shell 1, the shell 1 side wall is provided with a feed pipe 11 for the input of pharmaceutical samples, the shell 1 inside bottom is placed with the open top collecting box 12 to accept the qualified pharmaceutical samples after grinding and screening, the shell 1 is provided with a round hole 13 opposite to the feed pipe 11. The shell 1 is rotatably connected with the filter screen cylinder 2 with both ends open, wherein the filter screen cylinder 2 is connected with the feed pipe 11 and is rotatably supported by the first bearing 21 embedded and installed in the shell 1, the other end of the filter screen cylinder 2 is connected with the second bearing 22 installed in the round hole 13, and the filter screen cylinder 2 can stably rotate around its axis through the cooperation of the first bearing 21 and the second bearing 22. And the end of the filter screen cylinder 2 away from the feed pipe 11 is connected with a circular plate 24 through a third bearing 23, and the circular plate 24 is fixedly connected with the side wall of the shell 1 through a fixed rod 25, so that the filter screen cylinder 2 does not drive the circular plate 24 to move when rotating, and ensures that the circular plate 24 is always in a fixed and stationary state. In addition, the circular plate 24 is provided with a driving assembly 3, and the driving assembly 3 is in transmission connection with the filter screen cylinder 2 and the grinding roller assembly 4 inside the filter screen cylinder 2. When the driving assembly 3 starts to work, it can synchronously drive the filter screen cylinder 2 and the grinding roller assembly 4 to rotate, so as to realize the grinding and screening operation of the pharmaceutical samples; in addition, a plurality of groups of V-shaped material return plates 5 are arranged on the inner wall of the filter screen cylinder 2. During the rotation of the filter screen cylinder 2, the material return plates 5 can bring the coarse particle pharmaceutical samples which are ground by the grinding roller assembly 4 but not dropped to the collecting box 12 through the filter screen cylinder 2 back to the working area of the grinding roller assembly 4, so that the samples are ground again, thereby ensuring that the grinding fineness of the pharmaceutical samples meets the detection requirements.

[0018] In the implementation process, the shell 1 is used as the basic framework, the circular plate 24 is directly connected with the inner side wall of the shell 1 through the fixing rod 25, and the circular plate 24 is always in a stationary state. At the same time, the circular plate 24 is connected with the inner part of the one end of the filter screen cylinder 2 away from the feeding pipe 11 through the third bearing 23. The inner ring of the third bearing 23 is fixed (stationary) with the circular plate 24, and the outer ring is fixed (rotating) with the inner wall of the filter screen cylinder 2. The third bearing 23 realizes the frictionless connection between the filter screen cylinder 2 and the circular plate 24, and avoids the movement of the circular plate 24 when the filter screen cylinder 2 rotates, thereby providing a stable installation carrier for the driving assembly 3. In use, the medicine sample is input through the feeding pipe 11, and the filter screen cylinder 2 and the internal grinding roller assembly 4 are synchronously driven by the driving assembly 3 to operate. After the medicine sample enters the filter screen cylinder 2 through the feeding pipe 11, it falls between the rotating grinding roller assembly 4 and is ground into fine particles through the extrusion and shearing action of the grinding roller assembly 4. The ground particles are thrown to the cylinder wall along with the rotation of the filter screen cylinder 2, and the particles meeting the fineness directly enter the collection box 12 through the screen hole of the filter screen cylinder 2. The coarse particles that do not pass through the screen hole are brought upward by the movement of the back feeding plate 5, and when the particles move to the working area of the grinding roller assembly 4, they fall again to the grinding roller assembly 4, thereby realizing the secondary or multiple grinding treatment of the coarse particles until the qualified fine particles fall into the bottom collection box 12, thereby ensuring that the fineness of the final medicine sample meets the detection requirements.

[0019] For the above-mentioned scheme, specifically, referring to the accompanying drawings Figure 2 and the accompanying drawings Figure 3 , the driving assembly 3 includes a first rotating roller 31, a second rotating roller 32 and a third rotating roller 33 rotatably arranged on the circular plate 24. The other end of the first rotating roller 31, the second rotating roller 32 and the third rotating roller 33 are rotatably connected with one side wall of the shell 1. The first rotating roller 31 is provided with a first gear 34, the second rotating roller 32 is provided with a second gear 35 engaged with the first gear 34 and a third gear 36 coaxial with the second gear 35, and the third rotating roller 33 is provided with a fourth gear 37 engaged with the third gear 36. The fourth gear 37 is engaged with a fifth gear 38 arranged on the filter screen cylinder 2, so that the first rotating roller 31, the second rotating roller 32 or the third rotating roller 33 rotates, and the remaining components are linked. Of course, in the implementation process, a driving motor is connected with the first rotating roller 31, the second rotating roller 32 or the third rotating roller 33. This scheme will not be described in detail. The scheme mainly realizes the linkage between the filter screen cylinder 2 and the grinding roller assembly 4 through the setting and cooperation of the positions of the gears.

[0020] In the implementation of the above scheme, complete transmission chains are formed between the gears. When in operation, the external driving motor drives any rotating roller, which in turn drives the remaining rotating rollers through gear meshing linkage, and further synchronously drives the grinding roller assembly 4 and the filter screen cylinder 2 to operate. The synchronous rotation can realize seamless connection between the grinding and screening processes. While the grinding roller assembly 4 grinds the sample into particles, the filter screen cylinder 2 immediately screens the particles, without waiting for the grinding to be completed before starting the screening, thereby greatly shortening the single sample processing period, and without the need to additionally set two sets of independent driving systems to control grinding and screening, thereby reducing the time cost of equipment start-up and regulation.

[0021] For the above scheme, specifically, referring to the accompanying drawings Figure 6 As shown in the drawings, the grinding roller assembly 4 is arranged inside the housing 1 and connected with the first grinding shaft 41 of the first rotating roller 31, the second grinding shaft 42 of the second rotating roller 32, and the third grinding shaft 43 of the third rotating roller 33. The first grinding shaft 41 and the second grinding shaft 42 form a grinding channel therebetween for the drug sample to be ground therein. The third grinding shaft 43 is located directly below the grinding channel and is provided with a plurality of strip brushes 44 for contacting the first grinding shaft 41 and the second grinding shaft 42, so that in the grinding process, the ground particle materials can be dispersed by contacting the third grinding shaft 43 during the falling process, and the rotating strip brushes 44 can contact the surfaces of the first grinding shaft 41 and the second grinding shaft 42, thereby reducing the adhesion of the material particles on the first grinding shaft 41 and the second grinding shaft 42.

[0022] In the implementation of the above scheme, when the driving assembly 3 is started, the corresponding grinding shafts are synchronously driven to rotate. The drug sample enters the grinding channel through the feeding pipe 11, is ground into particles by the first grinding shaft 41 and the second grinding shaft 42, and is dispersed by contacting the third grinding shaft 43 during the falling process. At the same time, the rotating strip brushes 44 on the third grinding shaft 43 continuously clean the surfaces of the first grinding shaft 41 and the second grinding shaft 42, thereby reducing the adhesion of the material particles. This kind of multi-shaft cooperation not only ensures the grinding effect through the grinding channel, but also realizes particle dispersion by the third grinding shaft 43 below, thereby avoiding particle agglomeration. The strip brushes 44 solve the problem of material adhesion on the grinding shafts, thereby ensuring the grinding efficiency and sample purity, simplifying the structure, and reducing the maintenance difficulty.

[0023] From the cleaning perspective, in order to improve the cleaning effect of the first grinding shaft 41, the second grinding shaft 42, and the filter screen cylinder 2, the accompanying drawings Figure 3 and the accompanying drawings Figure 6As shown, the third grinding shaft 43 and the third rotating roller 33 are both hollow structures and are connected, and a plurality of nozzles 45 are arranged on the circumference of the third grinding shaft 43, and a rotating joint 46 for connecting with an external water inlet is coaxially arranged on the third rotating roller 33. When thorough cleaning of the components is required, the external water source enters the third rotating roller 33 through the rotating joint 46, then flows into the third grinding shaft 43, and finally sprays the cleaning liquid through the nozzles 45 on the third grinding shaft 43. At the same time, the third grinding shaft 43 rotates with the third rotating roller 33, and the nozzles 45 can cover the surfaces of the first grinding shaft 41 and the second grinding shaft 42 and the inner wall of the filter screen cylinder 2 by 360°, realizing targeted cleaning. Through the combination of rotation and spraying, the material residues adhered to the surfaces of the first grinding shaft 41 and the second grinding shaft 42 and the particles blocking the screen holes of the filter screen cylinder 2 can be completely removed, and the cleaning is thorough and has no dead angle. During use, after the grinding operation is completed, the rotating joint 46 is connected to the external water inlet, the driving assembly 3 is started to drive the grinding roller assembly 4 to rotate, the water source is turned on to spray and clean the nozzles 45, the spraying time is adjusted according to the residual situation, the water source is turned off after cleaning is completed, and the grinding roller assembly 4 is continuously operated for a while to shake off the residual water by using the centrifugal force.

[0024] Next, in order to improve the cleaning effect on the surface of the filter screen cylinder 2, for this purpose, referring to the accompanying drawings, Figure 1 As shown, the cleaning brush 47 is arranged in the shell 1 and continuously contacts the outer surface of the filter screen cylinder 2 in the rotating state of the filter screen cylinder 2. When the filter screen cylinder 2 is running, the outer surface may be attached with particles or dust, and the cleaning brush 47, which is fixedly installed on the shell 1, forms relative friction with the outer surface of the rotating filter screen cylinder 2, so that the residual particles adhered to the cylinder wall and the outer end of the screen hole of the filter screen cylinder 2 are brushed off, avoiding the accumulation of particles to block the screen holes. Without additional driving, the cleaning can be completed by relying on the original rotating action of the filter screen cylinder 2, saving equipment cost and energy consumption. Moreover, the continuous contact of the cleaning brush 47 can remove the residues in real time, avoiding the blockage of the screen holes to affect the screening efficiency and ensuring the long-term smoothness of the filter screen cylinder 2.

[0025] In addition, referring to the accompanying drawings, Figure 1 As shown, the fixed rod 25 is located between the discharge port of the feeding pipe 11 and the grinding channel, so that the drug samples falling through the feeding pipe 11 can contact the fixed rod 25 and be dispersed by the fixed rod 25. Specifically, when the drug samples fall through the feeding pipe 11, if they are in the form of blocks, agglomerates or are in a large single amount, they are easy to directly block the grinding channel. The fixed rod 25 is located between the two, can contact the falling drug samples before the grinding process, and uses the impact force of the samples falling by themselves and the blocking action of the fixed rod 25 to disperse the blocky or agglomerated samples into smaller particles or dispersed materials, so that the samples are more dispersed and uniform when entering the grinding channel.

[0026] For the above-mentioned scheme, considering the discharging effect of the material particles after being screened by the filter screen cylinder 2, for this purpose, referring to the accompanying drawings, Figure 1As shown, the housing 1 is provided with a conical structure of the centralized discharge hopper 6, the centralized discharge hopper 6 is between the filter screen cylinder 2 and the collection box 12; the qualified fine particle material falling through the filter screen cylinder 2 sieve hole will first fall into the upper conical centralized discharge hopper 6, with the help of the inclined guide action of the conical hopper wall, the material converges along the hopper wall to the hopper mouth, and then accurately falls into the lower collection box 12, avoiding the scattering of the material.

[0027] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A drug sample grinding device for drug testing, characterized by: The shell (1) comprises a housing (1), wherein one side of the housing (1) is provided with a feed pipe (11), the inner bottom surface is provided with a collection box (12) with an open top surface, and the other side opposite to the feed pipe (11) is provided with a circular opening (13); A filter screen cartridge (2) with open ends is movably connected to the rotating portion of the housing (1); one end of the filter screen cartridge (2) is connected to the feed pipe (11) and to a first bearing (21) embedded in the housing (1); and the other end is connected to a second bearing (22) installed in the circular opening (13); A circular plate (24) is connected to the other end of the filter screen drum (2) via a third bearing (23), and the circular plate (24) is connected to one side of the inner portion of the housing (1) via a fixing rod (25), so that the circular plate (24) is always in a fixed and stationary state when the filter screen drum (2) rotates; A driving assembly (3) is mounted on the circular plate (24), and the driving assembly (3) is connected to the filter screen cylinder (2) and the grinding roller assembly (4) located inside the filter screen cylinder (2), so that the operation of the driving assembly (3) can drive the filter screen cylinder (2) and the grinding roller assembly (4) to rotate simultaneously; A plurality of return plates (5) are provided on the inner circumference of the filter screen cylinder (2) so as to bring the drug samples that have been ground by the grinding roller assembly (4) and have not fallen from the sieve holes of the filter screen cylinder (2) back to the grinding roller assembly (4) for re-grinding as the filter screen cylinder (2) rotates.

2. The drug sample grinding device for drug testing according to claim 1, characterized in that: The driving assembly (3) includes a first rotating roller (31), a second rotating roller (32) and a third rotating roller (33) rotatably arranged on the circular plate (24), and the other ends of the first rotating roller (31), the second rotating roller (32) and the third rotating roller (33) are all rotatably connected to one side of the housing (1), a first gear (34) is mounted on the first rotating roller (31), a second gear (35) meshing with the first gear (34) and a third gear (36) coaxial with the second gear (35) are mounted on the second rotating roller (32), a fourth gear (37) meshing with the third gear (36) is mounted on the third rotating roller (33), and the fourth gear (37) meshes with a fifth gear (38) arranged on the filter screen drum (2).

3. The drug sample grinding device for drug testing according to claim 2, characterized in that: The grinding roller assembly (4) is arranged inside the housing (1) and comprises a first grinding shaft (41) connected to the first rotating roller (31), a second grinding shaft (42) connected to the second rotating roller (32), and a third grinding shaft (43) connected to the third rotating roller (33). A grinding channel is formed between the first grinding shaft (41) and the second grinding shaft (42). The third grinding shaft (43) is located directly below the grinding channel and is provided with a plurality of strip brushes (44) for contacting the first grinding shaft (41) and the second grinding shaft (42).

4. The drug sample grinding device for drug testing according to claim 3, characterized in that: The third grinding shaft (43) and the third rotating roller (33) are both hollow structures and are connected. A plurality of nozzles (45) are arranged on the circumference of the third grinding shaft (43). A rotary joint (46) for connecting to an external water source is coaxially mounted on the third rotating roller (33).

5. The drug sample grinding device for drug testing according to claim 4, characterized in that: A cleaning brush (47) is provided in the housing (1), and the cleaning brush (47) is in continuous contact with the outer surface of the filter screen cylinder (2) when the filter screen cylinder (2) is in a rotating state.

6. The drug sample grinding device for drug testing according to claim 1, characterized in that: The return plate (5) has a V-shaped structure.

7. The drug sample grinding device for drug testing according to claim 3, characterized in that: The fixing rod (25) is located between the discharge port of the feed pipe (11) and the grinding channel.

8. The drug sample grinding device for drug testing according to claim 1, characterized in that: A conical centralized hopper (6) is provided in the housing (1), and the centralized hopper (6) is located between the filter screen cylinder (2) and the collection box (12).

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