A medicine powder screening device for processing oral chewable tablets

Abstract

The utility model provides an oral chewable tablet processing medicine powder screening device. The screening device comprises: a cylinder; a screen assembly arranged inside the cylinder, comprising at least a second screen cylinder and a first screen cylinder sleeve sleeved inside the second screen cylinder; a drive assembly comprising a first drive part in driving connection with the first screen cylinder to drive the first screen cylinder to rotate, and a second drive part in driving connection with the second screen cylinder to drive the second screen cylinder to rotate; a feeding assembly sleeved inside the first screen cylinder, comprising a feeding pipeline and an air inlet pipeline arranged outside the feeding pipeline, the top of the cylinder being provided with a feeding port, the side wall being provided with a discharge port, the feeding pipeline extending into the bottom end of the first screen cylinder from the feeding port, the air inlet pipeline being in communication with an air pump, and the side wall of the air inlet pipeline being provided with a gas blowing port facing the feeding port. The rotation speed of the first screen cylinder is greater than that of the second screen cylinder. The screening device provided by the application improves the screening precision and the utilization rate of the material.

Description

Technical Field

[0001] This application relates to the pharmaceutical field, and more specifically, to a powder screening device for processing oral chewable tablets. Background Technology

[0002] In the production process of oral solid dosage forms, chewable tablets occupy an important position in the pharmaceutical and health product fields due to their advantages such as convenient administration, no need for water, and particular suitability for children, the elderly, or patients with swallowing difficulties. The core of chewable tablet production lies in ensuring good taste, appropriate hardness, and rapid disintegration. This is highly dependent on the physical properties of its raw material powder and excipients (such as fillers, disintegrants, flavoring agents, lubricants, etc.), especially the particle size distribution and uniformity of the powder. Utility Model Content

[0003] This application provides a powder screening device for processing oral chewable tablets, which improves the screening accuracy and material utilization rate.

[0004] Specifically, this application is implemented through the following technical solution: One aspect of this application provides a powder screening device for processing oral chewable tablets, comprising: cylindrical body; A screen assembly is disposed inside the cylinder and includes at least a first screen cylinder and a second screen cylinder, wherein the first screen cylinder is sleeved inside the second screen cylinder; The driving assembly includes a first driving part and a second driving part. The first driving part is drivenly connected to a first screen cylinder and is used to drive the first screen cylinder to rotate. The second driving part is drivenly connected to a second screen cylinder and is used to drive the second screen cylinder to rotate. A feeding assembly is fitted inside the first screen cylinder. The feeding assembly includes a feeding pipe and an air inlet pipe disposed outside the feeding pipe. The top of the cylinder has a feeding port and the side wall of the cylinder has a discharging port. The feeding pipe extends from the feeding port to the bottom of the first screen cylinder. The air inlet pipe is used to communicate with an air pump, and the side wall of the air inlet pipe has an air blowing port facing the feeding port. The rotational speed of the first screen cylinder is greater than that of the second screen cylinder.

[0005] Optionally, the first screen cylinder and the second screen cylinder rotate in opposite directions.

[0006] Optionally, the sieve openings of the first sieve cylinder are larger than those of the second sieve cylinder.

[0007] Optionally, the screen assembly further includes a third screen cylinder, and the driving assembly further includes a third driving unit. The third screen cylinder is sleeved outside the second screen cylinder, and the third driving unit is pulsatorically connected to the third screen cylinder for driving the third screen cylinder to rotate. The rotational speed of the third screen cylinder is opposite to that of the second screen cylinder. The rotational speed of the third screen cylinder is less than that of the second screen cylinder. The screen aperture of the third screen cylinder is smaller than that of the second screen cylinder.

[0008] Optionally, the feed pipe is sleeved inside the air inlet pipe, and the outer wall of the feed pipe and the interior of the air inlet pipe form an air inlet cavity.

[0009] Optionally, the outer wall of the air inlet pipe is connected to a plurality of air blowing pipes inclined toward the feed inlet, and the plurality of air blowing pipes are evenly arranged along the length of the air inlet pipe.

[0010] Optionally, a scraper is fixed to the outer wall of the third screen cylinder, and the other end of the scraper abuts against the inner wall of the cylinder.

[0011] Optionally, the first driving unit, the second driving unit, and the third driving unit rotate coaxially.

[0012] Optionally, the inner wall of the cylinder is provided with a first coating, which is a silicon dioxide-organosilicon composite coating.

[0013] This application provides a powder screening device for processing oral chewable tablets. The screening device includes a cylinder, a screen assembly, a drive assembly, and a feeding assembly. The powder material to be screened enters through the feeding pipe and accumulates at the bottom of the first screen cylinder. Since the side wall of the air inlet pipe has an air outlet facing the feed inlet, and the air outlet is connected to an air pump, the blown air can disperse the powder material accumulated at the bottom, making it evenly distributed along the length of the first screen cylinder. First, the centrifugal force generated by the rotation of the first and second screen cylinders acts on the powder material itself. The centrifugal impact force generated by the rotation and the intense collision and friction between the material and the cylinder wall and material particles can effectively break up and crush these clumps, releasing the encapsulated qualified fine powder. This improves the screening accuracy and material utilization rate. The speed difference between the inner and outer cylinders creates a continuous relative motion in the material layer between the screens. This motion can generate sufficient dynamic shear force to effectively peel off the fine powder particles attached to the edge of the screen holes, reducing their accumulation and clogging. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a driving component shown in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of a screening device shown in an exemplary embodiment of this application; Figure 3 This is a schematic diagram of a screen assembly shown in an exemplary embodiment of this application; Figure 4 This is a partial schematic diagram of a screening device shown in an exemplary embodiment of this application; Figure 5 This is a side view of a screen assembly shown in an exemplary embodiment of this application; Figure 6 This is a front view of a screen assembly shown in an exemplary embodiment of this application.

[0015] Wherein: 100, cylinder body; 110, feed inlet; 120, discharge outlet; 200, screen assembly; 210, first screen cylinder; 220, second screen cylinder; 230, third screen cylinder; 240, scraper; 300, drive assembly; 310, first drive unit; 320, second drive unit; 330, third drive unit; 400, feed assembly; 410, feed pipeline; 420, air inlet pipeline; 421, air blowing port; 422, air blowing pipe body. Detailed Implementation

[0016] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0017] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0018] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4This application provides a powder screening device for processing oral chewable tablets, including a cylinder 100, a screen assembly 200, a drive assembly 300, and a feeding assembly 400. The screen assembly 200 is disposed inside the cylinder 100 and includes at least a first screen cylinder 210 and a second screen cylinder 220, with the first screen cylinder 210 sleeved inside the second screen cylinder 220. The drive assembly 300 includes a first drive unit 310 and a second drive unit 320. The first drive unit 310 is driveably connected to the first screen cylinder 210 and is used to drive the first screen cylinder 210 to rotate; the second drive unit 320 is driveably connected to the second screen cylinder 220 and is used to drive the second screen cylinder 220 to rotate. Figure 4 The feeding assembly 400 is sleeved inside the first screen cylinder 210. The feeding assembly 400 includes a feeding pipe 410 and an air inlet pipe 420 disposed outside the feeding pipe 410. The top of the cylinder 100 is provided with a feeding port 110 and the side wall of the cylinder 100 is provided with a discharging port 120. The feeding pipe 410 extends from the feeding port 110 to the bottom end of the first screen cylinder 210. The air inlet pipe 420 is used to communicate with an air pump (not shown in the figure), and the side wall of the air inlet pipe 420 is provided with an air blowing port 421 facing the feeding port 110. The rotational speed of the first screen cylinder 210 is greater than that of the second screen cylinder 220.

[0019] The powdered material to be screened enters the feed pipe 410 through the feed inlet 110 located at the top of the cylinder 100. Since the feed pipe 410 extends to the bottom of the first screen cylinder 210, the powdered material to be screened enters through the feed pipe 410 and accumulates at the bottom of the first screen cylinder 210. It should be noted that the screening device is used vertically, that is, the screening components and the feed pipe 410 are both placed vertically, and the powdered material to be screened falls to the bottom of the first screen cylinder by gravity. Furthermore, since the side wall of the air inlet pipe 420 has an air outlet 421 facing the feed inlet 110, after the air outlet 421 is connected to the air pump, the airflow blown out can disperse the powdered material accumulated at the bottom, making it evenly distributed along the length of the first screen cylinder 210. Then, the powdered material to be screened is screened by the first screen cylinder 210 and the second screen cylinder 220, and then collected from the discharge port 120 opened on the side wall of the cylinder 100.

[0020] The first screen cylinder 210 and the second screen cylinder 220 are driven independently by the first drive unit 310 and the second drive unit 320, respectively, and rotate at different speeds, with the first screen cylinder 210 rotating at a higher speed than the second screen cylinder 220. Firstly, the centrifugal force generated by the rotation of the first screen cylinder 210 and the second screen cylinder 220 acts on the powder material itself. When the powder (especially oral chewable tablet powder containing binders or hygroscopic components) has slight agglomerates or clusters, the centrifugal impact force generated by the rotation and the intense collision and friction between the material and the cylinder wall and material particles can effectively break up and disperse these agglomerates, releasing the encapsulated qualified fine powder. This improves the screening accuracy and material utilization rate. Furthermore, the speed difference between the inner and outer cylinders creates continuous relative motion in the material layer between the screen meshes. This motion generates sufficient dynamic shear force to effectively peel off fine powder particles adhering to the edges of the screen holes, reducing their accumulation and clogging, and ensuring the continuous operation of the equipment.

[0021] In one embodiment, the first screen cylinder 210 and the second screen cylinder 220 rotate in opposite directions. For example, the first screen cylinder 210 rotates clockwise at high speed, while the second screen cylinder 220 rotates counterclockwise at low speed. Due to the opposite rotation directions, the relative linear velocity between the outer surface of the first screen cylinder 210 and the inner surface of the second screen cylinder 220 is equal to the sum of their linear velocities, not the difference. This multiplied relative velocity generates a stronger dynamic shear force field in the powder material layer filling the gaps. This force field, through intense collision and friction between material particles, peels off fine powder particles adhering to the inner wall of the screen holes and the surface of the screen, further reducing their accumulation and clogging.

[0022] In one embodiment, the sieve apertures of the first sieve cylinder 210 are larger than those of the second sieve cylinder 220. The high-speed rotating first sieve cylinder 210 utilizes the larger sieve apertures to quickly separate qualified fine powder and allow even finer powders to pass through. Simultaneously, it relies on greater centrifugal force to effectively break up agglomerates and reduce clogging of the large sieve apertures. The material after preliminary sieving falls into the lower-speed rotating outer cylinder, where the smaller sieve apertures perform fine secondary classification in a relatively stable environment, intercepting trace amounts of coarse particles or incompletely dispersed agglomerates, ensuring a high degree of uniformity in the final powder particle size. The speed difference, combined with the sieve aperture gradient, significantly improves sieving efficiency, accuracy, and anti-clogging capability.

[0023] refer to Figure 1 , Figure 3 and Figure 6In one embodiment, the sieve assembly 200 further includes a third sieve cylinder 230, and the drive assembly 300 further includes a third drive unit 330. The third sieve cylinder 230 is sleeved outside the second sieve cylinder 220, and the third drive unit 330 is drively connected to the third sieve cylinder 230 for driving the third sieve cylinder 230 to rotate. The rotational speed of the third sieve cylinder 230 may be opposite to that of the second sieve cylinder 220, and the rotational speed of the third sieve cylinder 230 is less than that of the second sieve cylinder 220, and the sieve aperture of the third sieve cylinder 230 is smaller than that of the second sieve cylinder 220. First, the sieve aperture size decreases step by step, and the rotational speed decreases step by step from the inside to the outside, so that the powder undergoes three progressive grading stages of coarse sieve, medium sieve, and fine sieve, ultimately producing a finer powder with more uniform particle size, meeting pharmaceutical standards. The third screen cylinder 230 and the second screen cylinder 220 rotate in opposite directions at low speed, forming a shear turbulent air field between the outermost two screens to peel off the ultrafine powder attached to the smallest screen hole.

[0024] In another embodiment, the feed pipe is sleeved inside the air inlet pipe, and the outer wall of the feed pipe and the interior of the air inlet pipe form an air inlet cavity. This design is compact, saves space, facilitates uniform airflow to disperse the powder, and improves the screening effect.

[0025] In one embodiment, the outer wall of the air inlet pipe 420 is connected to a plurality of air blowing pipes 422 inclined toward the feed inlet 110, and the plurality of air blowing pipes 422 are evenly arranged along the length of the air inlet pipe 420. The plurality of air blowing pipes 422 can evenly spray airflow to fully disperse the powder accumulated at the bottom of the screen cylinder, so that it is evenly dispersed inside the screen cylinder.

[0026] refer to Figure 3 , Figure 5 and Figure 6 In one embodiment, a scraper 240 is fixed to the outer wall of the third screen cylinder 230, with the other end of the scraper 240 abutting against the inner wall of the cylinder 100. When the third screen cylinder 230 rotates, the scraper 240 rotates accordingly, scraping off the powder adhering to the inner wall of the cylinder 100. This effectively solves the problem of powder adhering to the inner wall of the cylinder 100. A flexible, sheet-like scraper head, such as a food-grade silicone, wear-resistant polyurethane, or Teflon-coated scraper, can be installed at the top of the scraper 240 to form an adaptive scraping system that conforms to the cylinder wall. When the third screen cylinder 230 rotates, the flexible scraper head, with its elastic deformation capability, always closely conforms to the curved surface of the inner wall of the cylinder 100, achieving efficient scraping.

[0027] refer to Figure 1In one embodiment, the first drive unit 310, the second drive unit 320, and the third drive unit 330 rotate coaxially. The three drive units are three rigid drive rings assembled on the static support shaft of the main shaft of the equipment in a concentric nested manner, with the rings rotating independently of each other via bearings. Furthermore, the three rigid drive rings are directly opposite to the three screen cylinders and are fixedly connected, for example, by flange locking, bolt connection, or welding. Each of the three drive rings is independently connected to two servo motors.

[0028] In one embodiment, the inner wall of the cylinder 100 is provided with a first coating, which is a silica-organosilicon composite coating. This coating has significant anti-sticking and antistatic properties, which can effectively reduce the adhesion of the powder to the inner wall of the cylinder 100, and reduce the adhesion and residue of the powder.

[0029] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A powder screening device for processing oral chewable tablets, characterized in that, include: cylindrical body (100); A screen assembly (200) is disposed inside the cylinder (100) and includes at least a first screen cylinder (210) and a second screen cylinder (220), wherein the first screen cylinder (210) is sleeved inside the second screen cylinder (220); The drive assembly (300) includes a first drive unit (310) and a second drive unit (320). The first drive unit (310) is connected to the first screen cylinder (210) for driving the first screen cylinder (210) to rotate. The second drive unit (320) is connected to the second screen cylinder (220) for driving the second screen cylinder (220) to rotate. A feeding assembly (400) is fitted inside the first screen cylinder (210). The feeding assembly (400) includes a feeding pipe (410) and an air inlet pipe (420) disposed outside the feeding pipe (410). The top of the cylinder (100) is provided with a feeding port (110), and the side wall of the cylinder (100) is provided with a discharge port (120). The feeding pipe (410) extends from the feeding port (110) to the bottom end of the first screen cylinder (210). The air inlet pipe (420) is used to communicate with an air pump, and the side wall of the air inlet pipe (420) is provided with an air blowing port (421) facing the feeding port (110). The rotational speed of the first screen cylinder (210) is greater than that of the second screen cylinder (220).

2. The powder screening device for processing oral chewable tablets as described in claim 1, characterized in that, The first screen cylinder (210) rotates in the opposite direction to the second screen cylinder (220).

3. The powder screening device for processing oral chewable tablets as described in claim 2, characterized in that, The sieve openings of the first sieve cylinder (210) are larger than the sieve openings of the second sieve cylinder (220).

4. The powder screening device for processing oral chewable tablets as described in claim 3, characterized in that, The screen assembly (200) further includes a third screen cylinder (230), and the drive assembly (300) further includes a third drive unit (330). The third screen cylinder (230) is sleeved on the outside of the second screen cylinder (220). The third drive unit (330) is connected to the third screen cylinder (230) for driving the third screen cylinder (230) to rotate. The rotation speed of the third screen cylinder (230) is opposite to that of the second screen cylinder (220). The rotation speed of the third screen cylinder (230) is less than that of the second screen cylinder (220). The screen holes of the third screen cylinder (230) are smaller than those of the second screen cylinder (220).

5. The powder screening device for processing oral chewable tablets as described in claim 1, characterized in that, The feed pipe is sleeved inside the air inlet pipe, and the outer wall of the feed pipe and the inside of the air inlet pipe form an air inlet cavity.

6. The powder screening device for processing oral chewable tablets as described in claim 1, characterized in that, The outer wall of the air inlet pipe (420) is connected to a plurality of air blowing pipes (422) that are inclined toward the feed inlet (110), and the plurality of air blowing pipes (422) are evenly arranged along the length direction of the air inlet pipe (420).

7. The powder screening device for processing oral chewable tablets as described in claim 4, characterized in that, The outer wall of the third screen cylinder (230) is fixed with a scraper (240), and the other end of the scraper (240) abuts against the inner wall of the cylinder (100).

8. The powder screening device for processing oral chewable tablets as described in claim 4, characterized in that, The first drive unit (310), the second drive unit (320), and the third drive unit (330) rotate coaxially.

9. The powder screening device for processing oral chewable tablets as described in claim 1, characterized in that, The inner wall of the cylinder (100) is provided with a first coating, which is a silicon dioxide-organosilicon composite coating.

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