Medicinal material powder screening machine

Abstract

The utility model relates to the technical field of medicinal material powder screening, in particular to a medicinal material powder screening machine which comprises a machine frame, a supporting plate is arranged above the machine frame, a plurality of screening hoppers are arranged on the supporting plate, vibration motors are arranged among the screening hoppers, and the vibration motors are installed on the supporting plate. Screens are arranged in the middles of the screening hoppers respectively, screening grooves are formed in one sides of the screening hoppers, the bottom ends of the screening grooves and the top ends of the screens are located on the same horizontal plane, discharging hoppers are arranged on the outer sides of the screening grooves and communicate with inner cavities of the screening hoppers through the screening grooves, and material guiding mechanisms are arranged at the bottoms of the screening hoppers. The material guiding mechanism comprises a connecting cylinder, a guiding cylinder arranged below the connecting cylinder and a bearing arranged at the top end of the connecting cylinder in a sleeving mode, the connecting cylinder is rotationally installed on the screening hopper through the bearing, and the guiding cylinder is of a circular-arc-shaped cylindrical structure. According to the medicinal material powder screening machine, the conveying direction of medicinal material powder can be conveniently adjusted, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medicinal material powder screening, in particular to a medicinal material powder screening machine. Background Art

[0002] In order to speed up the absorption of medicinal materials by the human body and improve the bioavailability of the active ingredients of the drugs, based on grinding theory, combined with mechanical impact crushing and vibration grinding equipment, the medicinal materials are crushed and ground to obtain a powdered substance. Since the finer the particles of the crushed and ground medicinal materials, the smaller the bulk density of the prepared medicinal material powder, this means that the pore distribution between the medicinal material powders is better, which helps to accelerate the dissolution efficiency of the medicinal materials and thus improve the utilization rate of the medicinal materials. In addition, the crushed and ground medicinal materials are also conducive to the preparation of various pharmaceutical dosage forms, thereby accelerating the dissolution of the active ingredients in the medicinal materials, and also facilitating the process of preparation, administration and exerting the efficacy of the medicine, thereby optimizing the production process of pharmaceutical preparations and improving the quality of the medicines.

[0003] After the medicinal materials are crushed and ground, the medicinal powder often becomes uneven in size and mixed with impurities, which will affect the efficacy and quality of the medicine. Therefore, it is necessary to screen the medicinal powder after crushing and grinding in order to select the medicinal powder with larger particles, so as to collect the medicinal powder that has passed the crushing process to improve the uniformity of the medicinal powder. At present, the medicinal powder screening methods include hand screening, airflow screening, vibration screening, etc. These methods have their own characteristics. For fine-particle medicinal powder, hand screening is simple to operate but inefficient. When using airflow screening, since airflow is used as the separation medium, the medicinal powder sieves are prone to collision with each other under the drive of the airflow, which affects the screening efficiency and results in low separation accuracy of the airflow screening. In addition, airflow screening requires a large amount of gas, so the energy consumption is high. Vibration screening is the process of screening medicinal materials using a vibrating screen, so that the qualified medicinal powder passes through the sieve holes of the screen, while the unqualified medicinal powder remains on the screen, thereby completing the screening of the medicinal powder. Due to the characteristics of high precision and simple operation, vibration screening has become a commonly used screening method for medicinal powder.

[0004] The screening conditions for vibratory screening are determined by the mesh size of the screen, and these conditions vary for various medicinal powders. For vibratory screening equipment with a single sieve, the screen needs to be replaced frequently to meet the screening conditions. However, for vibratory screening equipment with multiple sieves, while the frequency of screen replacement can be reduced, the medicinal powder sifted by the multiple sieves is conveyed to various discharge ports. Since the position of the discharge ports cannot be adjusted, the sieved medicinal powder cannot be directly collected in a centralized manner. To this end, collection buckets must be placed at each discharge port of the vibratory screening equipment, and then personnel must collect the medicinal powder in the collection buckets, which increases the labor intensity of the personnel. Therefore, it is necessary to optimize and improve the vibratory screening equipment for medicinal powders. This will not only facilitate the adjustment of the medicinal powder conveying direction, but also reduce the labor intensity of personnel, thereby better meeting the needs of medicinal powder processing and facilitating its widespread application. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the utility model provides a medicinal material powder screening machine which is convenient for adjusting the conveying direction of medicinal material powder and reduces the labor intensity of personnel, and is used to overcome the defects in the prior art.

[0006] The technical solution adopted by the utility model is: a medicinal material powder screening machine, comprising a frame, a support plate is provided above the frame, a plurality of screening buckets are provided on the support plate, a vibration motor is provided between the plurality of screening buckets, the vibration motor is installed on the support plate, a screen is respectively provided in the middle of the plurality of screening buckets, a screening slot is provided on one side of the screening bucket, the bottom end of the screening slot and the top end of the screen are located on the same horizontal plane, a discharge hopper is provided outside the screening slot, the discharge hopper is installed on the outer wall of the screening bucket, the discharge hopper is connected to the inner cavity of the screening bucket through the screening slot, and a material guiding mechanism is provided at the bottom of the screening bucket; the material guiding mechanism comprises a connecting cylinder, a guide cylinder provided below the connecting cylinder and a bearing fitted on the top end of the connecting cylinder, the connecting cylinder is rotatably mounted on the screening bucket through the bearing, the guide cylinder adopts an arc-shaped cylindrical structure, and the top end of the guide cylinder is connected to the bottom end of the connecting cylinder.

[0007] Preferably, a buffer mechanism is provided between the frame and the support plate; the buffer mechanism comprises a plurality of L-shaped fixing plates provided on the frame, first bolts vertically mounted on the bottom plates of the plurality of fixing plates, springs and nuts mounted on the first bolts, and a bracket provided above the first bolts; the plurality of fixing plates are evenly arranged on the frame, the side plates of the fixing plates are mounted on the inner side surfaces of the frame, a sleeve hole is provided on the bottom plate of the fixing plate, the sleeve hole is movably mounted on the first bolt, the nut of the first bolt is mounted on the bottom surface of the bracket, the top end of the bracket is mounted on the support plate, the spring is clamped between the nut of the first bolt and the bottom plate of the fixing plate, the nut is threadedly mounted on the first bolt, and the nut is located below the fixing plate.

[0008] Preferably, a buffer pad is provided between the spring and the bottom plate of the fixed plate. The buffer pad is made of elastic material and has an annular structure. The buffer pad is sleeved on the first bolt, and both sides of the buffer pad are in contact with the bottom plate of the fixed plate and the spring respectively.

[0009] Preferably, the bottom of the screening bucket is installed on the support plate, the bottom of the screening bucket adopts a trumpet-shaped structure, the diameter of the bottom of the screening bucket gradually decreases along the direction away from the top of the screening bucket, and a support hole is opened on the support plate. The support hole is mounted on the bottom of the support plate, and the shape of the support hole is consistent with the bottom of the support plate.

[0010] Preferably, a fixed cylinder is provided at the bottom end of the screening bucket, the top end of the fixed cylinder is installed on the bottom end of the screening bucket, the inner cavity of the screening bucket is connected with the inner cavity of the fixed cylinder, the bearing is located between the connecting cylinder and the fixed cylinder, the inner ring of the bearing is installed on the fixed cylinder, and the outer ring of the bearing is installed on the connecting cylinder.

[0011] Preferably, a threaded hole is provided on the connecting tube, the threaded hole is located below the bearing, a second bolt is threadedly sleeved on the threaded hole, one end of the second bolt is in contact with the fixing tube, and the connecting tube is clamped on the fixing tube by the second bolt.

[0012] Preferably, a sealing ring made of elastic material is provided below the second bolt, the sealing ring is interference fit on the fixing tube, and the outer wall of the sealing ring contacts the inner wall of the connecting tube.

[0013] Preferably, a fixing ring is horizontally provided below the screen, the fixing ring is mounted on the inner wall of the screening bucket, the outer diameter of the fixing ring matches the inner diameter of the screening bucket, and the bottom surface of the screen contacts the top surface of the fixing ring.

[0014] The beneficial effects of the present invention are as follows: first, the present invention facilitates the simultaneous screening of multiple medicinal powders by providing a plurality of screening hoppers, and by adjusting the mesh sizes of the sieves in the plurality of screening hoppers, medicinal powders of different mesh sizes can be screened out. The provided support plate and vibration motor can simultaneously drive the plurality of screening hoppers to perform screening operations, thereby improving the use effect of the vibration motor. Furthermore, the present invention can adjust the bottom end position of the guide cylinder by providing a bearing, thereby facilitating the adjustment of the direction in which the plurality of screening hoppers discharge medicinal powders that meet the size requirements, thereby meeting requirements such as centralized collection of medicinal powders that meet the size requirements or separate collection of medicinal powders that meet the size requirements, thereby reducing the labor intensity of personnel.

[0015] Secondly, the present invention supports the spring and the first bolt by providing a fixed plate, and cushions the vibration generated by the vibration motor by holding them between the fixed plate and the first bolt. By adjusting the installation position of the nut, the degree of compression of the spring can be easily adjusted, so that the degree of spring reduction can be easily adjusted by adjusting the degree of compression of the spring. In addition, the present invention further enhances the cushioning effect by providing two sides of a buffer pad that contact the bottom plate of the fixed plate and the spring, respectively. Furthermore, the present invention provides a support hole on the support plate to facilitate the support plate to support the screening bucket, and allows qualified medicinal powder sifted through the screen to pass through the support hole, thereby meeting the collection needs of the medicinal powder.

[0016] Thirdly, the present invention provides a fixed cylinder to facilitate the connection of the bearing to the screening bucket, so that the connecting cylinder can be rotatably installed on the screening bucket. The threaded hole provided on the connecting cylinder and the second bolt threadedly mounted in the threaded hole facilitate the clamping of the connecting cylinder on the fixed cylinder. Therefore, before unloading the medicinal powder, the connecting cylinder is clamped and fixed to the fixed cylinder by tightening the second bolt, thereby preventing the connecting cylinder from shaking during the unloading process, thereby improving the stability of the unloading of the medicinal powder. Moreover, the present invention provides a sealing ring to seal the gap between the fixed cylinder and the connecting cylinder, thereby preventing the transported medicinal powder from diffusing into the gap between the connecting cylinder and the fixed cylinder, thereby improving the stability of the discharged medicinal powder. In addition, the present invention provides a fixed ring provided on the inner wall of the screening bucket to support the screen, so that the screen can be used to screen the medicinal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the present utility model.

[0018] Figure 2 This is an assembly cross-sectional view of the screening bucket and material guiding mechanism in the utility model.

[0019] Figure 3 for Figure 2 Enlarged schematic diagram of point A in the middle.

[0020] Figure 4 This is an exploded view of the assembly of the frame and bracket in the present invention.

[0021] Figure 5 This is an exploded view of the assembly of the support plate and screening bucket in the utility model.

[0022] Figure 6 This is an exploded view of the assembly of the support plate and bracket of the utility model.

[0023] Figure 7 This is an exploded view of the assembly of the fixing plate, the first bolt, the spring, the nut and the buffer pad in the present invention. DETAILED DESCRIPTION

[0024] like Figures 1 to 7 As shown, a medicinal material powder screening machine includes a frame 1, a support plate 2 is provided above the frame 1, a plurality of screening buckets 3 are provided on the support plate 2, a vibration motor 4 is provided between the plurality of screening buckets 3, the vibration motor 4 is installed on the support plate 2, and a screen 5 is respectively provided in the middle of the plurality of screening buckets 3, a screening slot 6 is provided on one side of the screening bucket 3, the bottom end of the screening slot 6 and the top end of the screen 5 are located on the same horizontal plane, a discharge hopper 7 is provided on the outside of the screening slot 6, the discharge hopper 7 is installed on the outer wall of the screening bucket 3, the discharge hopper 7 is connected to the inner cavity of the screening bucket 3 through the screening slot 6, and a material guiding mechanism is provided at the bottom of the screening bucket 3; the material guiding mechanism includes a connecting cylinder 8, a guide cylinder 9 provided below the connecting cylinder 8, and a bearing 10 fitted on the top end of the connecting cylinder 8, the connecting cylinder 8 is rotatably mounted on the screening bucket 3 through the bearing 10, the guide cylinder 9 adopts an arc-shaped cylindrical structure, and the top end of the guide cylinder 9 is connected to the bottom end of the connecting cylinder 8. The top and bottom of the screening hopper 3 are both open. Medicinal powder to be screened is fed through the top of the screening hopper 3. Medicinal powder that meets the size requirements passes through the screen 5 and is discharged through the guide cylinder 9. Medicinal powder that does not meet the size requirements is discharged through the screening trough 6 and the screening hopper 3. To this end, the provision of multiple screening hoppers 3 facilitates the simultaneous screening of multiple medicinal powders. Adjusting the mesh size of the screens within the screening hoppers 3 allows for screening of medicinal powders of varying mesh sizes. Furthermore, the provision of a bearing 10 allows the bottom position of the guide cylinder 9 to be adjusted, facilitating the adjustment of the direction in which the medicinal powders that meet the size requirements are discharged from the multiple screening hoppers 3. This allows for the collection of medicinal powders that meet the size requirements to be centralized or separated.

[0025] In this embodiment, a buffer mechanism is provided between the frame 1 and the support plate 2; the buffer mechanism comprises a plurality of L-shaped fixing plates 11 provided on the frame 1, a plurality of first bolts 12 vertically fitted on the bottom plates of the fixing plates 11, a spring 13 and a nut 14 fitted on the first bolt 12, and a bracket 15 provided above the first bolt 12; the plurality of fixing plates 11 are evenly arranged on the frame 1, the side plates of the fixing plates 11 are mounted on the inner side surfaces of the frame 1, a sleeve hole is provided on the bottom plate of the fixing plate 11, the sleeve hole is movably fitted on the first bolt 12, and the nut of the first bolt 12 is mounted on the bracket 15 On the bottom surface, the top of the bracket 15 is mounted on the support plate 2. The spring 13 is clamped between the nut of the first bolt 12 and the bottom plate of the fixing plate 11. The nut 14 is threaded onto the first bolt 12. The inner diameter of the nut 14 and the aperture of the sleeve match the diameter of the first bolt 12. The nut 14 is located below the fixing plate 11. The first bolt 12 is pressed against the fixing plate 11 by the spring 13, thereby utilizing the spring 13 to buffer the vibration generated by the vibration motor 4. By adjusting the installation position of the nut 14, the degree of compression of the spring 13 can be easily adjusted, so that the degree of reduction of the spring 13 can be easily adjusted by utilizing the degree of compression of the spring 13. It should be noted that the top of the bracket 15 should not be lower than the height of the top of the frame 1 to prevent the support plate 2 from contacting the frame 1.

[0026] Please refer again Figure 4 and 7 A buffer pad 16 is provided between the spring 13 and the bottom plate of the fixed plate 11. The buffer pad 16 is made of an elastic material and has a circular structure. The buffer pad 16 is mounted on the first bolt 12. The inner cavity diameter of the buffer pad 16 matches the diameter of the first bolt 12. Both sides of the buffer pad 16 are in contact with the bottom plate of the fixed plate 11 and the spring 13 respectively, thereby further improving the buffering effect.

[0027] Specifically, the bottom of the screening bucket 3 is installed on the support plate 2. The bottom of the screening bucket 3 adopts a trumpet-shaped structure. The bottom diameter of the screening bucket 3 gradually decreases along the direction away from the top of the screening bucket 3, so as to centrally process the qualified medicinal powder screened out by the screen 5, so as to facilitate the centralized discharge of the medicinal powder. A support hole 17 is provided on the support plate 2. The support hole 17 is mounted on the bottom of the support plate 2. The shape of the support hole 17 is consistent with the bottom of the support plate 2. The discharge hopper 7 is located above the support plate 2 to facilitate the support plate 2 to support the screening bucket 3, and to enable the qualified medicinal powder screened out by the screen 5 to pass through the support hole 17 to meet the collection needs of the medicinal powder.

[0028] In this embodiment, a fixed cylinder 18 is provided at the bottom end of the screening bucket 3, and the top end of the fixed cylinder 18 is installed on the bottom end of the screening bucket 3. The inner cavity of the screening bucket 3 is connected with the inner cavity of the fixed cylinder 18. The bearing 10 is located between the connecting cylinder 8 and the fixed cylinder 18. The inner ring of the bearing 10 is installed on the fixed cylinder 18, and the outer ring of the bearing 10 is installed on the connecting cylinder 8, so that the connecting cylinder 8 is rotatably installed on the screening bucket 3.

[0029] Please refer again Figure 5 A threaded hole is provided on the connecting tube 8, and the threaded hole is located below the bearing 10. A second bolt 19 is threadedly sleeved on the threaded hole. One end of the second bolt 19 is in contact with the fixed tube 18, and the connecting tube 8 is clamped on the fixed tube 18 by the second bolt 19. By tightening or loosening the second bolt 19, it is possible to control whether the connecting tube 8 is clamped and fixed on the fixed tube 18; for this reason, before unloading the medicinal material powder, the second bolt 19 is tightened to clamp the connecting tube 8 on the fixed tube 18 to prevent the connecting tube 8 from shaking during the unloading of the medicinal material powder, thereby improving the stability of the unloading of the medicinal material powder.

[0030] Please refer again Figure 7 A sealing ring 20 made of elastic material is provided below the second bolt 19. The sealing ring 20 is interference fit on the fixed cylinder 18. The outer wall of the sealing ring 20 contacts the inner wall of the connecting cylinder 8, thereby preventing the transported medicinal powder from diffusing into the gap between the connecting cylinder 8 and the fixed cylinder 18.

[0031] Please refer again Figure 2 and 3 A fixing ring 21 is horizontally provided below the screen 5. The fixing ring 21 is mounted on the inner wall of the screening bucket 3. The outer diameter of the fixing ring 21 matches the inner diameter of the screening bucket 3. The bottom surface of the screen 5 contacts the top surface of the fixing ring 21. The screen 5 is supported by the fixing ring 21. The screen 5 is fixed to the fixing ring 21 by screws, so that the screen 5 can be easily loaded and unloaded, so as to facilitate the replacement of the screen 5. It should be noted that the inner cavity of the discharge hopper 7 is an inverted L-shaped structure. The feed end of the discharge hopper 7 is connected to the screening slot 6. The discharge end of the discharge hopper 7 is located at the bottom end of the discharge hopper 7. With the help of the vibration of the vibration motor 4, the medicinal material powder on the screen 5 is driven to pass through the screening slot 6 and be transported into the discharge hopper 7, and then discharged through the bottom end of the discharge hopper 7, so as to discharge the medicinal material powder on the screen 5.

[0032] The method of using this product is as follows: Figures 1 to 7As shown, first, according to the needs of screening medicinal powder, the screens 5 that meet the screening needs are placed in the screening bucket 3 in sequence, and then the bottom end position of the guide cylinder 9 is adjusted. By tightening the second bolt 19, the connecting cylinder 8 is fixedly clamped on the fixed cylinder 18, and a collection bucket is placed under the guide cylinder 9 and the discharge hopper 7 to facilitate the collection of medicinal powder. Then, the product is tested. By starting the vibration motor 4, the screening bucket 3 and the screen 5 are driven to vibrate through the support plate 2, and the vibration conditions of several screening buckets 3 and the buffering conditions of the buffer mechanism are observed. If the vibration of several screening buckets 3 or the buffering of the buffer mechanism is uneven, turn off the vibration motor 4 and turn the position of the nut 14 according to the unevenness until the product remains stable during the test run. Then, the medicinal powder is put into several screening buckets 3 in sequence as needed, so that the medicinal powder falls on the screen 5. By starting the vibration motor 4, the screen 5 and the medicinal powder on the screen 5 are driven to vibrate, so that the screen 5 is used to screen the medicinal powder, so that the medicinal powder that meets the size requirements passes through the screen 5 and falls into the connecting cylinder 8 through the bottom of the screening bucket 3, and is then discharged through the guide cylinder 9; on the contrary, the medicinal powder that does not meet the size requirements is discharged through the screening slot 6 and the screening bucket 3 to complete the screening operation.

[0033] Through the embodiment, the provision of multiple screening hoppers 3 facilitates the simultaneous screening of multiple medicinal powders. By adjusting the mesh sizes of the screens within the multiple screening hoppers 3, medicinal powders of different mesh sizes can be screened out. The provision of the support plate 2 and the vibration motor 4 can simultaneously drive the multiple screening hoppers 3 to perform screening operations, thereby improving the efficiency of the vibration motor 4. Furthermore, the provision of the bearing 10 in this embodiment enables the adjustment of the bottom end position of the guide cylinder 9, thereby facilitating the adjustment of the direction in which the multiple screening hoppers 3 discharge medicinal powders that meet size requirements, thereby meeting requirements such as centralized collection of medicinal powders that meet size requirements or separate collection of medicinal powders that meet size requirements, thereby reducing the labor intensity of personnel.

[0034] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A medicinal material powder screening machine, comprising a frame (1), characterized in that: A support plate (2) is provided above the frame (1), a plurality of screening buckets (3) are provided on the support plate (2), a vibration motor (4) is provided between the plurality of screening buckets (3), the vibration motor (4) is installed on the support plate (2), a screen (5) is provided in the middle of each of the plurality of screening buckets (3), a screening slot (6) is provided on one side of the screening bucket (3), the bottom end of the screening slot (6) and the top end of the screen (5) are located on the same horizontal plane, a discharge hopper (7) is provided on the outside of the screening slot (6), the discharge hopper (7) is installed on the outer wall of the screening bucket (3), the discharge hopper (7) is connected to the inner cavity of the screening bucket (3) through the screening slot (6), and a material guide mechanism is provided at the bottom of the screening bucket (3); The material guiding mechanism comprises a connecting cylinder (8), a guide cylinder (9) arranged below the connecting cylinder (8), and a bearing (10) mounted on the top end of the connecting cylinder (8). The connecting cylinder (8) is rotatably mounted on the screening bucket (3) via the bearing (10). The guide cylinder (9) adopts an arc-shaped cylindrical structure. The top end of the guide cylinder (9) is connected to the bottom end of the connecting cylinder (8).

2. The medicinal material powder screening machine according to claim 1, characterized in that: A buffer mechanism is provided between the frame (1) and the support plate (2); The buffer mechanism comprises a plurality of L-shaped fixing plates (11) provided on the frame (1), first bolts (12) vertically mounted on the bottom plates of the plurality of fixing plates (11), springs (13) and nuts (14) mounted on the first bolts (12), and a bracket (15) arranged above the first bolts (12); the plurality of fixing plates (11) are evenly arranged on the frame (1), the side plates of the fixing plates (11) are mounted on the inner side surfaces of the frame (1), a sleeve hole is provided on the bottom plate of the fixing plates (11), the sleeve hole is movably mounted on the first bolts (12), the nuts of the first bolts (12) are mounted on the bottom surface of the bracket (15), the top end of the bracket (15) is mounted on the support plate (2), the spring (13) is clamped between the nuts of the first bolts (12) and the bottom plate of the fixing plates (11), the nuts (14) are threadedly mounted on the first bolts (12), and the nuts (14) are located below the fixing plates (11).

3. The medicinal material powder screening machine according to claim 2, characterized in that: A buffer pad (16) is provided between the spring (13) and the bottom plate of the fixed plate (11). The buffer pad (16) is made of elastic material and has a circular ring structure. The buffer pad (16) is sleeved on the first bolt (12). Both sides of the buffer pad (16) are in contact with the bottom plate of the fixed plate (11) and the spring (13) respectively.

4. The medicinal material powder screening machine according to claim 1, characterized in that: The bottom of the screening bucket (3) is mounted on the support plate (2). The bottom of the screening bucket (3) adopts a trumpet-shaped structure. The diameter of the bottom of the screening bucket (3) gradually decreases in a direction away from the top of the screening bucket (3). A support hole (17) is provided on the support plate (2). The support hole (17) is mounted on the bottom of the support plate (2). The shape of the support hole (17) matches the bottom of the support plate (2).

5. The medicinal material powder screening machine according to claim 1, characterized in that: A fixed cylinder (18) is provided at the bottom end of the screening bucket (3), the top end of the fixed cylinder (18) is mounted on the bottom end of the screening bucket (3), the inner cavity of the screening bucket (3) is communicated with the inner cavity of the fixed cylinder (18), the bearing (10) is located between the connecting cylinder (8) and the fixed cylinder (18), the inner ring of the bearing (10) is mounted on the fixed cylinder (18), and the outer ring of the bearing (10) is mounted on the connecting cylinder (8).

6. The medicinal material powder screening machine according to claim 5, characterized in that: A threaded hole is provided on the connecting tube (8), the threaded hole being located below the bearing (10). A second bolt (19) is threadedly sleeved on the threaded hole. One end of the second bolt (19) contacts the fixing tube (18), and the connecting tube (8) is clamped on the fixing tube (18) by the second bolt (19).

7. The medicinal material powder screening machine according to claim 6, characterized in that: A sealing ring (20) made of elastic material is provided below the second bolt (19). The sealing ring (20) is interference fit on the fixed cylinder (18), and the outer wall of the sealing ring (20) contacts the inner wall of the connecting cylinder (8).

8. The medicinal material powder screening machine according to claim 1, characterized in that: A fixing ring (21) is horizontally arranged below the screen (5). The fixing ring (21) is installed on the inner wall of the screening bucket (3). The outer diameter of the fixing ring (21) matches the inner diameter of the screening bucket (3). The bottom surface of the screen (5) contacts the top surface of the fixing ring (21).

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