Screening device and screening method for pill medicine production

Abstract

The invention relates to the field of screening equipment, in particular to a screening device for pill medicine production and a screening method.The screening device comprises a bearing base, a screening base body and a vibration motor fixedly installed at the bottom of the screening base body, and the screening device further comprises a stacked screening assembly which comprises an upper-layer screening frame and a lower-layer screening frame; a discharging screen is embedded between the upper-layer screening frame and the lower-layer screening frame, the side wall of the lower-layer screening frame is in through connection with a powder leading-out pipe, and the side wall of the upper-layer screening frame is in through connection with a particle leading-out pipe. The top cover wraps the upper-layer screening frame, and a feeding opening is formed in the center of the top of the top cover; the pre-dispersing mechanism comprises an annular shunting sieve plate and a plurality of stand column rods, an annular space flow guide channel is formed between the annular shunting sieve plate and the inner wall of the top cover, and a plurality of shunting sieve holes are uniformly formed in the surface of the annular shunting sieve plate. The vibrating screen has the effect of reducing the stacking and blocking probability of the material center during vibrating screen time division.

Description

Technical Field

[0001] The present application relates to the field of screening equipment, and in particular to a screening device and a screening method for producing pill-shaped medicines. Background Art

[0002] Traditional Chinese medicine pills, a common dosage form of traditional Chinese medicine, are typically prepared by crushing the raw materials prepared according to a specific ratio into a powder. This powder is then thoroughly mixed with honey and further rolled into pills. Since traditional Chinese medicine powders are intended for direct human consumption, strict requirements are placed on the particle size of the powder. Powders with larger particles do not meet the standards and must be removed through screening. Qualified pills require uniform particle size and good quality. Efficient screening equipment can improve production efficiency and reduce production costs, significantly impacting the economic benefits and market competitiveness of pharmaceutical companies.

[0003] According to a Chinese patent document titled "Device for Screening Pharmaceutical Raw Materials," with publication number CN206643010U and dated November 17, 2017, the device comprises a screening housing, the bottom of which is provided with a bottom support frame and a drive motor. A feed inlet is provided in the center of the top of the screening housing, and the interior of the screening housing is provided with a primary screening disc, a secondary screening disc, and a tertiary screening disc, arranged from top to bottom. Each screening disc has a primary screening hole, a secondary screening hole, and a tertiary discharge hole. When the screening device is in operation, the material to be screened is first injected through the feed inlet, and the material is subsequently screened through the primary screening disc, the secondary screening disc, and the tertiary screening disc.

[0004] With regard to the above-mentioned related technologies, in order to make the distribution of materials inside the screening machine more even, the feed port is set in the middle position of the top of the outer shell, so that the materials can fall directly to the center of the first-stage screening disc. However, when feeding continuously, undesirable conditions will occur. Since the materials are constantly concentrated and fall on the central area of ​​the first-stage screening disc, it is easy to form accumulation in this area. On the one hand, the accumulated materials will cause the sieve holes to be blocked. Once the sieve holes are blocked, the screening efficiency will be greatly reduced. On the other hand, the blockage of the sieve holes will also affect the feeding effect, so that the screened raw materials cannot be discharged smoothly. These problems affect each other, seriously interfering with the entire process of screening raw materials for pharmaceutical production, reducing production efficiency, and also affecting the quality of screening raw materials for pharmaceutical production. Summary of the Invention In view of this, the present application provides a screening device and screening method for the production of pill-shaped medicines, which are mainly used to solve the problems of accumulation and blockage in the center of materials and low screening efficiency during vibration screening.

[0005] The present application provides a screening device and a screening method for producing pill-shaped medicines, which adopt the following technical solutions: The first aspect of the present application provides a screening device for pill-shaped medicine production, which comprises a bearing base, a screening base body vertically connected to the upper end of the bearing base through a plurality of springs, and a vibration motor fixedly installed at the bottom of the screening base body, and further comprises: a superposed screening assembly comprising an upper layer screening frame and a lower layer screening frame coaxially arranged and installed at the top of the screening base body, a discharging screen mesh with a plurality of discharging screen holes being embedded between the upper layer screening frame and the lower layer screening frame, a powder discharge pipe being throughly connected to the side wall of the lower layer screening frame, and a particle discharge pipe being throughly connected to the side wall of the upper layer screening frame; a top cover covering the upper layer screening frame and having a feeding port formed at the center of the top thereof; and a pre-dispersion mechanism comprising a ring-shaped shunt sieve plate coaxially installed inside the top cover, a plurality of stand columns vertically connected between the edge of the ring-shaped shunt sieve plate and the inner top surface of the top cover, an annular gap flow channel being formed between the ring-shaped shunt sieve plate and the inner wall of the top cover, and a plurality of shunt screen holes being uniformly formed on the surface of the ring-shaped shunt sieve plate.

[0006] By adopting the above technical scheme, the screening device realizes three-stage optimized screening through the cooperation of the pre-dispersion mechanism and the superposed screening assembly: the shunt screen holes on the surface of the ring-shaped shunt sieve plate implement preliminary sorting on the input material, so that the powder particles meeting the aperture requirement fall vertically along the axial direction to the center area of the discharging screen mesh, and the particles with a particle size larger than the requirement are dispersed to the edge of the discharging screen mesh under the guidance of the annular gap flow channel, which is matched with the physical field characteristics of the vibration strength increment of the lower layer screening frame, effectively solving the problem of material accumulation in the central axial area of the discharging screen mesh due to vibration attenuation. The coaxial layout of the superposed screening assembly ensures that the excitation force generated by the vibration motor is uniformly conducted along the axial line of the upper layer screening frame and the lower layer screening frame, so that the large-particle-size material forms a centrifugal diffusion motion at the outer edge of the discharging screen mesh, and in cooperation with the lateral through structure of the powder discharge pipe and the particle discharge pipe, the directional separation of materials with different particle sizes is realized. The rigid connection system of the ring-shaped shunt sieve plate and the top cover through the stand columns maintains the stability of the pre-dispersion mechanism, and at the same time, forms a involute distribution trajectory of the falling material in the vibration transmission process, further improving the uniformity of the material distribution.

[0007] Optionally, the lower limit value of the aperture of the shunt screen holes of the ring-shaped shunt sieve plate is not less than the upper limit value of the aperture of the discharging screen holes of the discharging screen mesh.

[0008] By adopting the above technical solution, by limiting the lower limit of the aperture of the diverter screen holes of the annular diverter screen plate to no less than the upper limit of the aperture of the discharge screen holes of the discharge screen, a filtering logic match is formed between the pre-screening stage and the main screening process. This aperture constraint ensures that the material directly penetrates the annular diverter screen plate under the action of vibration, and enters the low vibration amplitude area in the center area of ​​the discharge screen along the axial direction for passive screening, thereby avoiding the risk of secondary interception of removable materials by the annular diverter screen plate. The synchronously running annular gap guide channel will guide the over-limit particles to the high vibration active area at the edge of the discharge screen, eliminating the local material retention phenomenon caused by the blockage of the pre-screening path.

[0009] Optionally, a plurality of radially distributed guide rods are equidistantly installed on the outer side wall of the annular diversion screen plate in the circumferential direction. The guide rods are arranged in a divergent manner along the radial direction of the annular diversion screen plate, and a gap gradually expanding structure with a diversion function is formed between two adjacent guide rods.

[0010] By adopting the above technical solution, a dynamic material guidance and control mechanism is formed through the divergent extension arrangement of the guide rods and the gradually expanding gap structure between two adjacent guide rods: the gradually expanding gap space between the two adjacent guide rods guides the large particle material to migrate along a divergent trajectory to the edge of the lower material screen under the action of centrifugal force. The gradient expansion feature of the gradually expanding gap structure makes the scattering range of the large particle material match the vibration intensity distribution range of the lower material screen, effectively dispersing the material retention caused by the single path in traditional equipment. The guide rods gradually peel off the material agglomerates under the synergistic action of the axial and radial components of the guide gap in the gradually expanding area, prompting the agglomerated particles to continue to dissociate during the migration process. The combined structure of the guide rods and the annular diversion screen plate realizes the adaptation of the screening path and vibration, and reduces the probability of material accumulation in the transition zone from the center area to the edge of the lower material screen from the physical arrangement.

[0011] Optionally, the guide rod is made of spring steel in one piece, the cross-sectional area of ​​the rod body of each guide rod decreases linearly from the connecting end close to the outer side wall of the annular diversion screen plate to the free end, and the outer surface of the rod body of the guide rod is mirror polished.

[0012] Optionally, the lower screening frame includes a lower annular side wall that passes through the powder outlet pipe, a lower mounting ring fixed to the top of the outer periphery of the lower annular side wall, and an L-shaped clamping piece vertically welded to the top surface of the lower mounting ring and having an axial extension portion and a radial extension portion; the upper screening frame includes an upper annular side wall that passes through the particle outlet pipe, the bottom end of the upper annular side wall forms an interference fit with the axial extension portion of the L-shaped clamping piece, and the circumferential edge of the blanking screen is rolled to form a fitting edge with a thickness of 2-3 mm, and the fitting edge is clamped in the annular gap formed between the axial extension portion and the upper annular side wall.

[0013] By adopting the above technical solution, radial extrusion force is formed by the interference fit between the axial extension of the L-shaped clamping part and the bottom end of the upper annular side wall. On the one hand, the axial alignment accuracy of the screening frame can be automatically corrected during the vertical assembly process, effectively suppressing the sealing failure caused by eccentric vibration. On the other hand, when the blanking screen is installed, the blanking screen can be tightly supported between the upper annular side walls. The chimeric edge of the blanking screen formed by rolling is clamped in the annular gap between the axial extension and the upper annular side wall, so that the load borne by the edge of the blanking screen is dispersed to the contact surface, avoiding local stress concentration at the edge of the blanking screen and thus causing plastic deformation of the blanking screen.

[0014] Optionally, an adjustable locking ring is provided on the outside of the radial extension portion of the L-shaped clamping part, and the end of the engaging edge of the blanking screen extends to form a bending portion covering the outer peripheral surface of the radial extension portion, and the bending portion is pressed and fixed on the outer peripheral surface of the radial extension portion by the radial clamping force of the adjustable locking ring.

[0015] By adopting the above technical solution, an adjustable locking ring is provided on the outside of the radial extension portion of the L-shaped clip, and the bent portion of the engaging edge of the blanking screen can withstand the radial clamping force of the locking ring, and then fit tightly against the outer peripheral surface of the radial extension portion, thereby enhancing the tear resistance of the edge of the blanking screen through the annular contact surface. At the same time, the elastic deformation of the locking ring can be dynamically adjusted to achieve effective pressing of blanking screens of different thicknesses.

[0016] Optionally, an upper mounting ring coaxial with the upper annular side wall is provided at the outer bottom of the upper annular side wall, the upper mounting ring is coaxially sleeved with the lower mounting ring, and an outer clamp is sleeved on the outer side of the upper mounting ring and the lower mounting ring.

[0017] By adopting the above technical solution, a coaxial upper mounting ring is arranged at the bottom of the outer periphery of the upper annular side wall to form a coaxial sleeved double-ring positioning structure with the lower mounting ring, and the external clamp sleeved on the outside produces a uniform radial restraint force, which not only ensures the concentricity accuracy of the assembly of the upper screening frame and the lower screening frame and reduces eccentric wear loss, but also the open hoop structure of the external clamp enables the upper and lower mounting ring groups to be quickly separated and maintained without disassembling the unloading screen.

[0018] Optionally, an annular pressure-stabilizing component is fixedly connected to the inner circumferential surface of the upper annular side wall, and the annular pressure-stabilizing component includes a wavy elastic plate arranged coaxially with the upper annular side wall, and the bottom edge of the wavy elastic plate extends downward and forms a contact band, and the contact band is fitted against the top end of the axial extension portion of the L-shaped clip.

[0019] By adopting the above technical solution, an annular pressure-stabilizing component with a wavy elastic plate is arranged on the inner circumferential surface of the upper annular side wall, so that the pressure-stabilizing component can maintain a stable pressing state on the top of the clamping part in the axial direction, and allow a controllable relative sliding between the upper annular side wall and the lower annular side wall, thereby comprehensively improving the dynamic operation stability and fatigue resistance of the screening device.

[0020] Optionally, a conical protrusion is provided on the wavy elastic plate, and a wedge-shaped deformation space is formed between the conical protrusion and the inner circumferential surface of the upper annular side wall.

[0021] In a second aspect, the present application provides a screening method for producing pill-shaped drugs, which adopts the following technical solution: A screening method for producing pill-shaped medicines, applied to the screening device for producing pill-shaped medicines described in the first aspect, the screening method comprising: S1: The mixed material is fed into the feeding port, so that the material first contacts the annular diverter sieve plate. The powder particles with a particle size smaller than the diverter sieve hole directly pass through the diverter sieve hole to form the central downflow; S2: The oversized particles that fail to pass through the diversion sieve spread toward the periphery along the annular gap diversion channel, forming a spiral progressive outer edge distribution under the excitation force of the vibration motor; S3: The central material flow falls vertically to the center area of ​​the material discharge screen, and the materials distributed on the outer edge slide along the inner wall of the upper screening frame to the edge area of ​​the material discharge screen; S4: The gradient vibration field of the lower screening frame drives the material in the central area to produce axial beating screening, while causing the material in the edge area to form centrifugal diffusion movement; S5: The fine powder material that passes through the discharge sieve holes is collected through the powder outlet pipe, and the large particle material that does not pass through the sieve holes is discharged through the particle outlet pipe.

[0022] By adopting the above technical solution, the primary sorting of materials is achieved through the diversion screen holes of the annular diversion screen plate, so that powder particles with a particle size smaller than the diversion screen holes directly form the central discharge flow, while the oversized particles diffuse to the periphery along the annular gap guide channel; in the discharge screen area, the central discharge flow falls vertically to the central area of ​​the discharge screen, and the materials distributed on the outer edge slide along the inner wall of the upper screening frame to the edge area of ​​the discharge screen; through the gradient vibration field of the lower screening frame, the materials in the central area undergo axial jumping screening, and the materials in the edge area undergo centrifugal diffusion movement; finally, the fine powder materials that pass through the discharge screen holes are collected through the powder outlet pipe, and the large particles that do not pass through the sieve holes are discharged through the particle outlet pipe. This method realizes the automatic classification of materials according to particle size, ensuring the continuity and efficiency of the screening process.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. This screening device achieves three-level optimized screening through the structural coordination of the pre-dispersion mechanism and the stacked screening assembly: the diverter screen holes on the surface of the annular diverter screen plate perform preliminary sorting of the input material, so that the powdered particles that meet the aperture requirements fall vertically along the axial direction to the center area of ​​the discharge screen, and the oversized particles are dispersed to the edge of the discharge screen under the guidance of the annular gap guide channel. This guide path is compatible with the physical field characteristics of the increasing vibration intensity of the lower screening frame, effectively solving the problem of material accumulation caused by vibration attenuation in the central axis area of ​​the discharge screen. The coaxial layout of the stacked screening assembly ensures that the exciting force generated by the vibration motor is evenly transmitted along the axis of the upper screening frame-lower screening frame, so that large-particle-size materials form a centrifugal diffusion motion at the outer edge of the discharge screen. Combined with the lateral through-structure of the powder outlet pipe and the particle outlet pipe, directional separation of materials of different particle sizes is achieved. The rigid connection system between the annular diversion screen plate and the top cover is constructed by vertical rods. While maintaining the stability of the pre-dispersion mechanism, it also allows the falling materials to form an involute distribution trajectory during the vibration transmission process, further improving the uniformity of material distribution. 2. A dynamic material guidance and control mechanism is formed through the divergent extension arrangement of the guide rods and the gradually expanding gap structure between two adjacent guide rods: the gradually expanding gap space between two adjacent guide rods guides the large particle materials to migrate along a divergent trajectory to the edge of the lower material screen under the action of centrifugal force. The gradient expansion feature of the gradually expanding gap structure makes the scattering range of the large particle materials match the vibration intensity distribution range of the lower material screen, effectively dispersing the material retention caused by the single path in traditional equipment. The guide rods gradually peel off the material agglomerates under the synergistic action of the axial and radial components of the guide gap in the gradually expanding area, prompting the continuous dissociation of agglomerated particles during the migration process. The combined structure of the guide rods and the annular diversion screen plate realizes the adaptation of the screening path and vibration, and reduces the probability of material accumulation in the transition zone from the center area to the edge of the lower material screen from the physical arrangement; 3. By arranging an adjustable locking ring on the outer side of the radial extension of the L-shaped clamping piece, the bent portion of the fitting edge of the blanking screen can withstand the radial clamping force of the locking ring, and then cling to the outer peripheral surface of the radial extension. The tear resistance of the blanking screen edge is enhanced through the annular contact surface. At the same time, the elastic deformation of the locking ring can be dynamically adjusted to achieve effective pressing of blanking screens of different thicknesses. 4. By arranging a coaxial upper mounting ring at the bottom of the outer periphery of the upper annular side wall, it forms a coaxial sleeved double-ring positioning structure with the lower mounting ring, and cooperates with the external sleeve outer clamp to produce uniform radial constraint force, which not only ensures the concentricity accuracy of the assembly of the upper and lower screening frames and reduces eccentric wear loss, but also the open hoop structure of the outer clamp enables the upper and lower mounting ring groups to be quickly separated and maintained without disassembling the blanking screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of an embodiment of the present application; Figure 2 is a top view of a screening device according to an embodiment of the present application; Figure 3 1 is a top view of the pre-dispersion mechanism in an embodiment of the present application; Figure 4 is a three-dimensional diagram of a pre-dispersion mechanism in an embodiment of the present application; Figure 5 is a cross-sectional view of a stacked screening assembly embodied in the present application; Figure 6 This application Figure 5 A partial enlarged view of the middle area A; Figure 7 This application Figure 5 A partial enlarged view of area B in the middle.

[0025] Description of reference numerals: 1. Stacked screening assembly; 11. Upper screening frame; 111. Upper annular sidewall; 112. Fitting edge; 1121. Bend; 113. Annular gap; 114. Upper mounting ring; 12. Lower screening frame; 121. Lower annular sidewall; 123. Lower mounting ring; 124. L-shaped clamp; 1241. Axial extension; 1242. Radial extension; 13. Feeding screen; 131. Feeding screen aperture; 14. Powder outlet pipe; 15. Particle outlet pipe; 16. Adjustable locking ring; 17. External clamp; 18. Annular pressure stabilizing member; 181. Corrugated elastic plate; 182. Contact band; 183. Wedge-shaped deformation space; 2. Top cover; 21. Feeding port; 3. Pre-dispersion mechanism; 31. Annular diversion sieve plate; 32. Vertical column; 33. Annular gap guide channel; 34. Diversion sieve hole; 35. Guide rod; 36. Gap gradual expansion structure; 100. Screening device; 101. Support base; 102. Spring; 103. Screening base; 104. Vibration motor. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the appended drawings of the embodiments of the present application. Figure 1 -Attached Figure 7 , clearly and completely describe the technical solutions of the embodiments of this application.

[0027] The embodiments of the present application disclose a screening device and a screening method for producing pill-shaped medicines.

[0028] In a first aspect, the present application provides a screening device for producing pill-shaped medicines. Reference Figure 1, the screening device 100 includes a bearing base 101, a screening base 103 vertically connected to the upper end of the bearing base 101 through a plurality of springs 102, a vibration motor 104 fixedly installed at the bottom of the screening base 103, and a stacked screening assembly 1 installed at the top of the screening base 103. Wherein, the bearing base 101 should be placed on a horizontal working surface, through the high-frequency micro-vibration of the vibration motor 104, the material in the stacked screening assembly 1 forms a stable and controllable spiral vortex motion, thereby ensuring the uniformity of the material distribution on the screen surface.

[0029] Referring to Figure 1 , Figure 2 and Figure 3 , the stacked screening assembly 1 includes an upper layer screening frame 11 and a lower layer screening frame 12 coaxially arranged on the top of the screening base 103, a discharging screen 13 with a plurality of discharging screen holes 131 is embedded between the upper layer screening frame 11 and the lower layer screening frame 12, the side wall of the lower layer screening frame 12 is throughly connected with a powder guide pipe 14, and the side wall of the upper layer screening frame 11 is throughly connected with a particle guide pipe 15.

[0030] The screening device 100 further includes a top cover 2 wrapped on the upper layer screening frame 11 and a pre-dispersion mechanism 3 installed inside the top cover 2, wherein the top cover 2 is wrapped on the upper layer screening frame 11 and a feeding port 21 is formed at the center of the top. The pre-dispersion mechanism 3 includes a ring-shaped shunt screen plate 31 coaxially installed inside the top cover 2, a plurality of stand columns 32 vertically connected between the edge of the ring-shaped shunt screen plate 31 and the inner top surface of the top cover 2, an annular gap flow channel 33 formed between the ring-shaped shunt screen plate 31 and the inner wall of the top cover 2, and a plurality of shunt screen holes 34 uniformly formed on the surface of the ring-shaped shunt screen plate 31.

[0031] The screening device 100 adopts the cooperative design of the pre-dispersion mechanism 3 and the stacked screening assembly 1, which realizes the efficient three-stage screening of the material: the ring-shaped shunt screen plate 31 preliminarily sorts the material through the shunt screen holes 34 on its surface, the particles and powders meeting the requirements vertically fall to the center area of the discharging screen 13, and the oversized particles are dispersed along the annular gap flow channel 33 to the edge of the screen, effectively avoiding the accumulation of material in the central axis area. The coaxial design of the stacked screening assembly 1 ensures that the excitation force is uniformly transmitted from the upper layer to the lower layer, which promotes the centrifugal diffusion motion of the large particle material at the outer edge of the screen, and in combination with the laterally through powder guide pipe 14 and particle guide pipe 15, realizes the accurate separation of materials of different particle sizes. At the same time, the ring-shaped shunt screen plate 31 and the top cover 2 are rigidly connected through the stand columns 32, which not only ensures the stability of the pre-dispersion mechanism 3, but also forms a involute distribution trajectory of the material in the vibration transmission process, significantly improving the uniformity of the material distribution.

[0032] Referring to Figure 3 and Figure 4, the lower limit of the aperture of the diverter sieve hole 34 of the annular diverter sieve plate 31 is not lower than the upper limit of the aperture of the feed screen hole 131 of the feed screen 13. The present screening device 100 constructs a cascade filtration system of the pre-screening stage and the main screening process by strictly limiting the matching relationship between the lower limit of the aperture of the diverter sieve hole 34 of the annular diverter sieve plate 31 and the upper limit of the aperture of the feed screen hole 131 of the feed screen 13. Specifically, the lower limit of the aperture of the diverter sieve hole 34 of the annular diverter sieve plate 31 is always not lower than the upper limit of the aperture of the feed screen hole 131 of the feed screen 13. This size constraint ensures that under the action of vibration excitation, the material that meets the main screening requirements can completely penetrate the diverter sieve hole 34 of the annular diverter sieve plate 31 and directly enter the low vibration amplitude working area in the center area of ​​the feed screen 13 along the vertical axis direction for precise screening, thereby completely avoiding the unnecessary interception of qualified materials by the annular diverter sieve plate 31. At the same time, the annular gap guide channel 33 transports the over-limit materials in a directionally manner to the high-vibration active area at the edge of the discharge screen 13. Through the synergistic effect of the differentiated vibration parameters of the two zones, the local accumulation problem caused by material path blockage during the pre-screening process is effectively solved.

[0033] A plurality of radially distributed guide rods 35 are equidistantly installed on the outer wall of the annular diverter screen plate 31 . The guide rods 35 extend radially along the radial direction of the annular diverter screen plate 31 , and a gap expansion structure 36 with a diverting function is formed between two adjacent guide rods 35 .

[0034] A dynamic material guidance and control system is constructed through the divergent arrangement of guide rods 35 and the gradually expanding gap structure 36 between adjacent guide rods 35. The gradually expanding gap structure 36 between adjacent guide rods 35 forms a guide channel that gradually increases in size from the center to the outer edge. Under the action of the centrifugal field, it guides large particles of material to migrate along a divergent trajectory toward the edge of the feed screen 13. The gradient expansion feature of the gradually expanding gap structure 36 ensures that the material spreading range precisely matches the vibration intensity gradient distribution from the center to the edge of the feed screen 13, effectively eliminating the localized material accumulation caused by the single guide path in traditional equipment. The axial and radial forces generated by the guide rods 35 in the gradually expanding guide gap area work together to ensure the continuous dissociation of agglomerated particles during migration, significantly reducing the probability of material accumulation in the transition zone from the center to the edge of the feed screen 13 from a physical perspective.

[0035] The guide rod 35 is made of spring steel in one piece. The cross-sectional area of ​​each guide rod 35 decreases linearly from the connecting end close to the outer wall of the annular diversion screen plate 31 to the free end, and the outer surface of the guide rod 35 is mirror polished.

[0036] Reference Figure 1 、 Figure 5 、 Figure 6 as well as Figure 7The lower screening frame 12 includes a lower annular side wall 121 that passes through the powder outlet pipe 14, a lower mounting ring 123 fixed to the top of the outer periphery of the lower annular side wall 121, and an L-shaped clip 124 vertically welded to the top surface of the lower mounting ring 123 and having an axial extension portion 1241 and a radial extension portion 1242; the upper screening frame 11 includes an upper annular side wall 111 that passes through the particle outlet pipe 15, and the bottom end of the upper annular side wall 111 forms an interference fit with the axial extension portion 1241 of the L-shaped clip 124, and the circumferential edge of the blanking screen 13 is rolled to form a fitting edge 112 with a thickness of 2-3 mm, and the fitting edge 112 is clamped in the annular gap 113 formed between the axial extension portion 1241 and the upper annular side wall 111.

[0037] The interference fit structure between the axial extension 1241 of the L-shaped clip 124 and the bottom end of the upper annular side wall 111 achieves multiple technical effects: during the assembly process, the radial extrusion force formed by the axial extension 1241 of the L-shaped clip 124 and the bottom end of the upper annular side wall 111 can, on the one hand, automatically correct the axial alignment accuracy of the screen frame during vertical assembly, effectively suppressing sealing failure caused by eccentric vibration; on the other hand, when installing the blanking screen 13, this extrusion force can firmly support the blanking screen 13 between the upper annular side wall 111. At the same time, the interlocking edge 112 of the blanking screen 13 formed by rolling is tightly clamped in the annular gap 113 between the axial extension 1241 of the L-shaped clip 124 and the upper annular side wall 111. This structural design allows the load borne by the edge of the blanking screen 13 to be evenly distributed over the entire contact surface, thereby effectively avoiding local stress concentration at the edge of the blanking screen 13 and preventing plastic deformation of the blanking screen 13.

[0038] An adjustable locking ring 16 is provided on the outside of the radial extension portion 1242 of the L-shaped clamping piece 124, and the end of the engaging edge 112 of the blanking screen 13 extends to form a bending portion 1121 covering the outer peripheral surface of the radial extension portion 1242. The bending portion 1121 is pressed and fixed on the outer peripheral surface of the radial extension portion 1242 by the radial clamping force of the adjustable locking ring 16.

[0039] By providing an adjustable locking ring 16 on the outside of the radial extension 1242 of the L-shaped clamping member 124, the bent portion 1121 of the interlocking edge 112 of the blanking screen 13 can withstand the radial clamping force applied by the adjustable locking ring 16, thereby ensuring that the bent portion 1121 of the interlocking edge 112 of the blanking screen 13 forms a tight annular contact surface with the outer peripheral surface of the radial extension 1242 of the L-shaped clamping member 124. On the one hand, this structural design significantly improves the tear resistance of the edge of the blanking screen 13 by increasing the contact area. On the other hand, by utilizing the elastic deformation characteristics of the adjustable locking ring 16, the pressing force of the adjustable locking ring 16 on the bent portion 1121 of the interlocking edge 112 of the blanking screen 13 can be dynamically adjusted according to the installation requirements of blanking screens 13 of different thicknesses, thereby achieving a stable and reliable assembly effect.

[0040] An upper mounting ring 114 is coaxially provided at the bottom of the outer periphery of the upper annular side wall 111 . The upper mounting ring 114 is coaxially sleeved with the lower mounting ring 123 . An outer clamp 17 is sleeved on the outer sides of the upper mounting ring 114 and the lower mounting ring 123 .

[0041] By arranging a coaxial upper mounting ring 114 at the bottom of the outer periphery of the upper annular side wall 111, a coaxially sleeved double-ring positioning structure is formed with the lower mounting ring 123, and the externally sleeved outer clamp 17 produces a uniform radial restraint force. This structural design achieves dual technical effects: on the one hand, the precise cooperation of the double-ring positioning structure ensures the concentricity accuracy of the assembly of the upper screening frame and the lower screening frame, effectively reducing the wear and loss caused by eccentric operation; on the other hand, the unique open hoop structure of the outer clamp 17 is utilized to enable the upper and lower mounting ring groups (upper mounting ring 114 and lower mounting ring 123) to be quickly separated for maintenance operations while keeping the discharge screen 13 in a complete installation state, thereby significantly improving the convenience of equipment maintenance.

[0042] An annular pressure-stabilizing member 18 is fixedly connected to the inner circumference of the upper annular sidewall 111. This member comprises a wavy elastic plate 181 coaxially arranged with the upper annular sidewall 111. The bottom edge of the wavy elastic plate 181 extends downward to form a contact zone 182, which abuts against the top of the axially extending portion 1241 of the L-shaped clip 124. The wavy elastic plate 181 is provided with a conical protrusion, forming a wedge-shaped deformation space 183 between the conical protrusion and the inner circumference of the upper annular sidewall 111.

[0043] An annular pressure-stabilizing member 18 comprising a wavy elastic plate 181 is provided on the inner circumference of the upper annular sidewall 111. This member maintains a stable axial pressure against the top end of the clamping member while allowing for controllable relative sliding motion between the upper annular sidewall 111 and the lower annular sidewall 121. The unique structural design of the wavy elastic plate 181 ensures the maintenance of preload during assembly while absorbing vibration energy during operation through elastic deformation, thereby achieving a comprehensive improvement in the operational stability and fatigue resistance of the screening device 100 under dynamic operating conditions.

[0044] The implementation principle of a screening device for the production of pill-shaped medicines in an embodiment of the present application is as follows: the screening device 100 realizes primary sorting of materials through the diversion screen holes 34 of the annular diversion screen plate 31, and qualified particles fall vertically into the central area of ​​the discharge screen 13, and oversized particles are guided to the edge through the gap expansion structure 36 of the guide rod 35; the L-shaped clamping part 124 and the upper annular side wall 111 are interference fit to ensure assembly coaxiality, and at the same time clamp the engaging edge 112 of the discharge screen 13 to avoid stress concentration; the adjustable locking ring 16 dynamically adjusts the screen pressing force; the double-ring positioning structure cooperates with the external clamp 17 to maintain concentricity, and the wavy elastic plate 181 absorbs vibration energy to achieve the unity of stable screening and convenient maintenance.

[0045] In a second aspect, the present application provides a screening method for producing pill-shaped drugs, which adopts the following technical solution: A screening method for producing pill-shaped medicines, applied to the screening device for producing pill-shaped medicines in the first aspect, the screening method comprising: S1: Mixed material is fed into the feed port 21, so that the material first contacts the annular diverter screen plate 31. Powdered particles with a particle size smaller than the diverter screen holes 34 directly pass through the diverter screen holes 34 to form a central downflow. S2: The oversized particles that do not pass through the diversion sieve 34 diffuse toward the periphery along the annular gap guide channel 33 and form a spiral progressive outer edge distribution under the excitation force of the vibration motor 104; S3: The central material flow falls vertically to the central area of ​​the material discharge screen 13, and the materials distributed on the outer edge slide along the inner wall of the upper screening frame 11 to the edge area of ​​the material discharge screen 13; S4: The gradient vibration field of the lower screening frame 12 drives the material in the central area to produce axial beating screening, while causing the material in the edge area to form centrifugal diffusion motion; S5: The fine powder material that passes through the discharge sieve hole 131 is collected through the powder outlet pipe 14, and the large particle material that does not pass through the sieve hole is discharged through the particle outlet pipe 15.

[0046] In the description of this application, it should be understood that the terms "vertical", "horizontal", etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

Claims

1. A screening device for producing pill-shaped medicines, comprising a supporting base, a screening base vertically connected to the upper end of the supporting base through a plurality of springs, and a vibration motor fixedly mounted on the bottom of the screening base, characterized in that: The screening device further comprises: A stacked screening assembly comprises an upper screening frame and a lower screening frame coaxially mounted on top of the screening base, a feed screen having a plurality of feed screen holes being embedded between the upper and lower screening frames, the side wall of the lower screening frame being connected to a powder outlet pipe, and the side wall of the upper screening frame being connected to a particle outlet pipe; A top cover, which covers the upper screening frame and has a feeding port at the top center; The pre-dispersion mechanism includes an annular diversion sieve plate coaxially installed on the inner side of the top cover, and a plurality of vertical columns vertically connected between the edge of the annular diversion sieve plate and the inner top surface of the top cover. An annular gap guide channel is formed between the annular diversion sieve plate and the inner wall of the top cover, and a plurality of diversion sieve holes are evenly opened on the surface of the annular diversion sieve plate.

2. The screening device for producing pill-shaped medicines according to claim 1, characterized in that: The lower limit value of the aperture of the diversion sieve holes of the annular diversion sieve plate is not lower than the upper limit value of the aperture of the feed sieve holes of the feed screen.

3. The screening device for producing pill-shaped medicines according to claim 2, characterized in that: A plurality of radially distributed guide rods are equidistantly installed on the outer side wall of the annular diverter screen plate. The guide rods are arranged in a divergent manner along the radial direction of the annular diverter screen plate, and a gap gradually expanding structure with a diverting function is formed between two adjacent guide rods.

4. The screening device for producing pill-shaped medicines according to claim 3, characterized in that: The guide rod is made of spring steel in one piece, and the cross-sectional area of ​​the rod body of each guide rod decreases linearly from the connecting end close to the outer side wall of the annular diversion screen plate to the free end, and the outer surface of the rod body of the guide rod is mirror polished.

5. The screening device for producing pill-shaped medicines according to claim 1, characterized in that: The lower screening frame includes a lower annular side wall that passes through the powder outlet pipe, a lower mounting ring fixed to the top of the outer periphery of the lower annular side wall, and an L-shaped clamping piece vertically welded to the top surface of the lower mounting ring and having an axial extension portion and a radial extension portion; the upper screening frame includes an upper annular side wall that passes through the particle outlet pipe, the bottom end of the upper annular side wall forms an interference fit with the axial extension portion of the L-shaped clamping piece, the circumferential edge of the blanking screen is rolled to form a fitting edge with a thickness of 2-3 mm, and the fitting edge is clamped in the annular gap formed between the axial extension portion and the upper annular side wall.

6. The screening device for producing pill-shaped medicines according to claim 5, characterized in that: An adjustable locking ring is provided on the outside of the radial extension portion of the L-shaped clamping part, and the end of the engaging edge of the blanking screen extends to form a bent portion covering the outer peripheral surface of the radial extension portion, and the bent portion is pressed and fixed on the outer peripheral surface of the radial extension portion by the radial clamping force of the adjustable locking ring.

7. The screening device for producing pill-shaped medicines according to claim 5, characterized in that: An upper mounting ring coaxial with the upper annular side wall is provided at the outer bottom of the upper annular side wall. The upper mounting ring is coaxially sleeved with the lower mounting ring. External clamps are sleeved on the outer sides of the upper mounting ring and the lower mounting ring.

8. The screening device for producing pill-shaped medicines according to claim 7, characterized in that: An annular pressure-stabilizing component is fixedly connected to the inner circumferential surface of the upper annular side wall, and the annular pressure-stabilizing component includes a wavy elastic plate arranged coaxially with the upper annular side wall. The bottom edge of the wavy elastic plate extends downward and forms a contact band, and the contact band is in contact with the top end of the axial extension portion of the L-shaped clip.

9. The screening device for producing pill-shaped medicines according to claim 8, characterized in that: A conical protrusion is provided on the wavy elastic plate, and a wedge-shaped deformation space is formed between the conical protrusion and the inner circumferential surface of the upper annular side wall.

10. A screening method for producing pill-shaped medicines, applied to the screening device for producing pill-shaped medicines according to any one of claims 1 to 9, characterized in that: The screening method comprises: S1: The mixed material is fed into the feeding port, so that the material first contacts the annular diverter sieve plate. The powder particles with a particle size smaller than the diverter sieve hole directly pass through the diverter sieve hole to form the central downflow; S2: The oversized particles that fail to pass through the diversion sieve spread toward the periphery along the annular gap diversion channel, forming a spiral progressive outer edge distribution under the excitation force of the vibration motor; S3: The central material flow falls vertically to the center area of ​​the material discharge screen, and the materials distributed on the outer edge slide along the inner wall of the upper screening frame to the edge area of ​​the material discharge screen; S4: The gradient vibration field of the lower screening frame drives the material in the central area to produce axial beating screening, while causing the material in the edge area to form centrifugal diffusion movement; S5: The fine powder material that passes through the discharge sieve holes is collected through the powder outlet pipe, and the large particle material that does not pass through the sieve holes is discharged through the particle outlet pipe.

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