Screening device and screening method for pellet pharmaceutical production

Abstract

The application relates to the field of screening equipment, in particular to a screening device for pill-shaped medicine production and a screening method, the screening device comprising a bearing base, a screening base body and a vibration motor fixedly installed at the bottom of the screening base body, and further comprising: 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, a powder discharge pipe is connected through the side wall of the lower layer screening frame, and a particle discharge pipe is connected through the side wall of the upper layer screening frame; a top cover which is covered on the upper layer screening frame and is provided with a feeding port at the top center; and a pre-dispersion mechanism which comprises a ring-shaped shunt sieve plate and a plurality of stand columns, an annular gap flow channel is formed between the ring-shaped shunt sieve plate and the inner wall of the top cover, and a plurality of shunt sieve holes are uniformly arranged on the surface of the ring-shaped shunt sieve plate. The application has the effect of reducing the probability of material accumulation and blockage at the center during vibration screening.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of screening equipment, in particular to a screening device and a screening method for pill-shaped medicine production. BACKGROUND

[0002] As a common Chinese medicine dosage form, the preparation process of Chinese medicine pills usually includes crushing the prepared Chinese medicine raw materials according to a specific ratio to make them into powder, then mixing the powder with honey, and further rolling into pills. Since the Chinese medicine powder is directly consumed by people, the particle size of the powder is strictly required, and the powder with larger particles does not meet the standard and must be removed through screening operation. The pill-shaped medicine needs to have uniform particle size and good quality, and an efficient screening device can improve production efficiency and reduce production cost, which has an important influence on the economic benefit and market competitiveness of pharmaceutical enterprises.

[0003] Referring to the Chinese patent document with the publication number CN206643010U and the publication date of November 17, 2017, and the name of a drug production raw material screening device, the device includes a screening machine shell, the bottom of which is provided with a bottom support frame and a driving motor, the top middle of the screening machine shell is provided with a feeding port, and the inside of the screening machine shell is sequentially provided with a first screening disc, a second screening disc and a third screening disc from top to bottom, each screening disc is provided with a first screening hole, a second screening hole and a third discharge port. When the above screening device works, the material to be screened is first injected through the feeding port, and the material will be screened through the first screening disc, the second screening disc and the third screening disc in sequence.

[0004] In order to make the distribution of the material in the screening machine more uniform, the feeding port is arranged at the top middle position of the shell body, so that the material can directly fall to the center position of the first screening disc. However, when the feeding is continuous, an undesirable condition will occur. Since the material is continuously concentrated and falls in the central area of the first screening disc, accumulation is easily formed in this area. On the one hand, the accumulated material will cause the screen hole to be blocked, and once the screen hole is blocked, the screening efficiency will be greatly reduced. On the other hand, the screen hole blockage will also affect the discharging effect, so that the screened raw materials cannot be smoothly discharged. These problems affect each other, seriously interfere with the whole process of drug production raw material screening, reduce the production efficiency, and also affect the quality of drug production raw material screening SUMMARY

[0005] Therefore, the present application provides a screening device and a screening method for pill-shaped medicine production, which are mainly used to solve the problems of material center accumulation and blockage and low screening efficiency during vibration screening.

[0006] The screening device and the screening method for pill-shaped medicine production provided by the present application adopt the following technical solutions:

[0007] In a first aspect, the 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.

[0008] 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.

[0009] 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.

[0010] By adopting the technical scheme, the lower limit of the aperture of the ring-shaped shunt sieve plate is not less than the upper limit of the aperture of the discharging sieve, and the filtering logic matching between the pre-screening stage and the main screening process is formed. The aperture constraint condition ensures that the material directly penetrates the ring-shaped shunt sieve plate under the action of vibration and enters the low-vibration-amplitude area of the center area of the discharging sieve to be passively screened, thereby avoiding the risk of secondary interception of the ring-shaped shunt sieve plate to the screenable material. The annular gap guide channel running synchronously guides the out-of-limit particles to the high-vibration-active area at the edge of the discharging sieve, and eliminates the local material retention phenomenon caused by the pre-screening path blockage.

[0011] Optionally, the outer side wall of the ring-shaped shunt sieve plate is circumferentially and equidistantly provided with a plurality of radiation distributed guide rods, the guide rods are arranged in a divergent manner along the radial direction of the ring-shaped shunt sieve plate, and a gap gradually expanding structure with a guide function is formed between adjacent two guide rods.

[0012] By adopting the technical scheme, the material dynamic guide and control mechanism is formed by the divergent arrangement of the guide rods and the gap gradually expanding structure between adjacent two guide rods: the gradually expanding gap space between adjacent two guide rods guides the large particle material to migrate along a divergent trajectory to the edge of the discharging sieve under the action of centrifugal force, and the gradient expansion feature of the gap gradually expanding structure makes the throwing range of the large particle material match the vibration intensity distribution range of the discharging sieve, effectively dispersing the material retention caused by the single path in the traditional equipment. The guide rods implement progressive stripping of the material agglomerates under the synergistic action of the axial and radial components of the guide gap gradually expanding area, and promote the continuous dissociation of the caked particles during the migration process. The combination structure of the guide rods and the ring-shaped shunt sieve plate realizes the adaptation of the screening path and the vibration, and reduces the probability of material accumulation from the center area to the edge transition area of the discharging sieve from the physical arrangement.

[0013] Optionally, the guide rod is integrally made of spring steel, the cross-sectional area of the rod body of each guide rod linearly decreases from the connecting end close to the outer side wall of the ring-shaped shunt sieve plate to the free end, and the outer surface of the rod body of the guide rod is mirror polished.

[0014] Optionally, the lower layer screening frame includes a lower annular side wall through which the powder guide pipe penetrates, a lower layer mounting ring fixed to the outer peripheral top of the lower annular side wall, and an L-shaped clamping piece vertically welded to the top surface of the lower layer mounting ring and having an axial extension and a radial extension; the upper layer screening frame includes an upper annular side wall through which the particle guide pipe penetrates, and the bottom end of the upper annular side wall is in interference fit with the axial extension of the L-shaped clamping piece; the circumferential edge of the discharging sieve is formed into a 2-3mm thick embedded edge by rolling, and the embedded edge is clamped in the annular gap formed between the axial extension and the upper annular side wall.

[0015] By adopting the technical scheme, the axial extension of the L-shaped clamping piece is in interference fit with the bottom end of the upper annular sidewall to form a radial extrusion force, which can automatically correct the axial alignment accuracy of the screening frame during vertical assembly, effectively inhibit the sealing failure caused by eccentric vibration, and also enable the discharge screen to be tightly supported between the upper annular sidewalls when the discharge screen is installed. The embedded edge of the discharge screen formed by rolling and pressing is clamped in the annular gap between the axial extension and the upper annular sidewall, so that the load borne by the edge of the discharge screen is dispersed to the contact surface, avoiding local stress concentration of the edge of the discharge screen and plastic deformation of the discharge screen.

[0016] Optionally, the outer side of the radial extension of the L-shaped clamping piece is provided with an adjustable locking ring, the end of the embedded edge of the discharge screen extends to form a bent portion covering the outer peripheral surface of the radial extension, and the bent portion is pressed and fixed on the outer peripheral surface of the radial extension by the radial clamping force of the adjustable locking ring.

[0017] By adopting the technical scheme, the radial extension of the L-shaped clamping piece is provided with an adjustable locking ring, the bent portion of the embedded edge of the discharge screen can bear the radial clamping force of the locking ring, thereby tightly abutting the outer peripheral surface of the radial extension, and the tearing resistance of the edge of the discharge screen is enhanced through the annular contact surface. Meanwhile, the elastic deformation amount of the locking ring can be dynamically adjusted to effectively press and fit the discharge screen of different thicknesses.

[0018] Optionally, the outer peripheral bottom of the upper annular sidewall is provided with an upper mounting ring coaxial with the upper annular sidewall, the upper mounting ring is coaxially sleeved with the lower mounting ring, and an outer clamp is sleeved outside the upper mounting ring and the lower mounting ring.

[0019] By adopting the technical scheme, the coaxial upper mounting ring is arranged at the outer peripheral bottom of the upper annular sidewall to form a double-ring positioning structure coaxially sleeved with the lower mounting ring, and a uniform radial restraint force is generated by cooperating with the outer clamp sleeved outside, which ensures the concentricity precision of the assembled upper screening frame and lower screening frame, reduces eccentric wear, and the open clamp body structure of the outer clamp enables the upper and lower mounting ring groups to be quickly separated and maintained without disassembling the discharge screen.

[0020] Optionally, the inner peripheral surface of the upper annular sidewall is fixedly connected with a ring-shaped pressure stabilizing member, the ring-shaped pressure stabilizing member includes a wave-shaped elastic plate arranged coaxially with the upper annular sidewall, and the bottom edge of the wave-shaped elastic plate extends downward and forms a contact band abutting against the top end of the axial extension of the L-shaped clamping piece.

[0021] By adopting the technical scheme, the annular pressure stabilizing member with the wavy elastic plate is arranged on the inner circumferential surface of the upper annular side wall, so that the pressure stabilizing member can maintain the stable pressure holding state on the top end of the clamping piece in the axial direction and allow the relative sliding between the upper annular side wall and the lower annular side wall with a controllable amplitude, thereby comprehensively improving the dynamic operation stability and fatigue resistance of the screening device.

[0022] Optionally, the wavy elastic plate is provided with a tapered protruding portion, and a wedge-shaped deformation space is formed between the tapered protruding portion and the inner circumferential surface of the upper annular side wall.

[0023] In a second aspect, the application provides a screening method for pill-shaped medicine production, which adopts the following technical scheme:

[0024] A screening method for pill-shaped medicine production is applied to the screening device for pill-shaped medicine production in the first aspect, and the screening method comprises the following steps:

[0025] S1: The mixture is poured into the feeding port, so that the mixture first contacts the annular shunt sieve plate, wherein the powder particles with a particle size less than the shunt sieve hole directly pass through the shunt sieve hole to form a central downward flow;

[0026] S2: The particles with a particle size greater than the shunt sieve hole are diffused to the outer periphery along the annular gap flow channel, and form a spiral progressive outer edge distribution under the action of the vibration motor excitation force;

[0027] S3: The central downward flow vertically falls to the central area of the downward sieve screen, and the materials in the outer edge distribution slide along the inner wall of the upper screening frame to the edge area of the downward sieve screen;

[0028] S4: The gradient vibration field of the lower screening frame drives the materials in the central area to produce axial jumping screening, and simultaneously drives the materials in the edge area to form centrifugal diffusion motion;

[0029] S5: The fine powder materials passing through the downward sieve hole are collected through the powder outlet pipe, and the large particle materials not passing through the sieve hole are discharged through the particle outlet pipe.

[0030] By adopting the technical scheme, the shunt sieve hole of the annular shunt sieve plate is used to realize the primary separation of the materials, so that the powder particles with a particle size less than the shunt sieve hole directly form a central downward flow, and the particles with a particle size greater than the shunt sieve hole are diffused to the outer periphery along the annular gap flow channel; in the downward sieve screen area, the central downward flow vertically falls to the central area of the downward sieve screen, and the materials in the outer edge distribution slide along the inner wall of the upper screening frame to the edge area of the downward sieve screen; under the action of the gradient vibration field of the lower screening frame, the materials in the central area produce axial jumping screening, and the materials in the edge area form centrifugal diffusion motion; finally, the fine powder materials passing through the downward sieve hole are collected through the powder outlet pipe, and the large particle materials not passing through the sieve hole are discharged through the particle outlet pipe. The method realizes the automatic classification treatment of the materials according to the particle size, and ensures the continuity and efficiency of the screening process.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1、The screening device realizes three-stage optimized screening through the cooperation of the pre-dispersion mechanism and the structure of the stacked screening assembly: the shunt screen holes on the surface of the annular shunt screen plate implement preliminary sorting of the input material, so that the powder particles meeting 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 flow guide channel. The flow guide path is adapted to the physical field characteristics of the increasing vibration intensity of the lower screening frame, effectively solving the problem of material accumulation in the central axis area of the discharge screen due to vibration attenuation. The coaxial layout of the stacked screening assembly ensures that the excitation force generated by the vibration motor is uniformly transmitted along the axial line of the upper screening frame and the lower screening frame, so that the large-particle material forms a centrifugal diffusion motion at the outer edge of the discharge screen, and the lateral through structure of the powder outlet pipe and the particle outlet pipe realizes the directional separation of materials of different particle sizes. The rigid connection system formed by the annular shunt screen plate and the top cover through the column rod maintains the stability of the pre-dispersion mechanism, and at the same time, the falling material forms a involute distribution trajectory in the vibration transmission process, further improving the uniformity of material distribution;

[0033] 2、The dynamic material guiding and controlling mechanism is formed by the divergent extension arrangement of the flow guide rods and the gradually expanding structure between adjacent two flow guide rods: the gradually expanding gap space between adjacent two flow guide rods guides the large-particle material to migrate along the divergent trajectory to the edge of the discharge screen under the action of centrifugal force. The gradient expansion feature of the gradually expanding gap structure makes the throwing range of the large-particle material match the vibration intensity distribution range of the discharge screen, effectively dispersing the material retention caused by single path in traditional equipment. The axial and radial components of the flow guide rod in the gradually expanding area of the flow guide gap work together to implement progressive stripping of the material agglomerates, promoting the continuous dissociation of the caked particles during migration. The combination structure of the flow guide rod and the annular shunt screen plate realizes the adaptation of the screening path and the vibration, reducing the probability of material accumulation from the center area to the edge transition area of the discharge screen in terms of physical arrangement;

[0034] 3、By setting an adjustable locking ring outside the radial extension of the L-shaped clamping piece, the bent part of the embedded edge of the discharge screen can withstand the radial clamping force of the locking ring, thereby tightly adhering to the outer surface of the radial extension. Through the ring contact surface, the edge tear resistance of the discharge screen is enhanced, and the elastic deformation amount of the locking ring can also be dynamically adjusted to effectively press the discharge screen of different thicknesses;

[0035] 4. By setting a coaxial upper mounting ring at the bottom of the outer periphery of the upper annular sidewall, a double-ring positioning structure is formed with the lower mounting ring, which is coaxially connected. With the external clamp, a uniform radial constraint force is generated, which not only ensures the concentricity accuracy of the upper and lower screening frames and reduces wear, but also allows the upper and lower mounting rings to be quickly separated and maintained without disassembling the feeding screen due to the open clamp structure of the external clamp. Attached Figure Description

[0036] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0037] Figure 2 This is a top view of the screening device according to an embodiment of this application;

[0038] Figure 3 This is a top view of the pre-dispersion mechanism in the embodiments of this application;

[0039] Figure 4 This is a perspective view illustrating the pre-dispersion mechanism in the embodiments of this application;

[0040] Figure 5 This is a cross-sectional view illustrating the stacked screening assembly in this application;

[0041] Figure 6 This application Figure 5 A magnified view of a portion of region A in the middle;

[0042] Figure 7 This application Figure 5 A magnified view of a portion of region B in the middle.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Stacked screening assembly; 11. Upper screening frame; 111. Upper annular sidewall; 112. Fitting edge; 1121. Bending part; 113. Annular gap; 114. Upper mounting ring; 12. Lower screening frame; 121. Lower annular sidewall; 123. Lower mounting ring; 124. L-shaped snap-fit; 1241. Axial extension; 1242. Radial extension; 13. Feeding screen; 131. Feeding screen hole; 14. Powder outlet pipe; 15. Particle outlet pipe; 16. Adjustable locking ring; 17. External clamp; 18. Annular pressure stabilizing component; 181. Corrugated elastic plate; 182. Contact strip; 183. Wedge-shaped deformation space;

[0045] 2. Top cover; 21. Feed port;

[0046] 3. Pre-dispersion mechanism; 31. Annular diversion sieve plate; 32. Column rod; 33. Annular gap guide channel; 34. Diversion sieve hole; 35. Guide rod; 36. Gradually expanding gap structure;

[0047] 100, screening device; 101, bearing base; 102, spring; 103, screening base body; 104, vibration motor. DETAILED DESCRIPTION

[0048] To make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the following will combine the accompanying drawings of the embodiments of the present application to clearly and completely describe the technical solutions of the embodiments of the present application. Figure 1 - the accompanying drawings Figure 7 , the technical solutions of the embodiments of the present application are clearly and completely described.

[0049] The embodiments of the present application disclose a screening device for pill-shaped medicine production and a screening method.

[0050] In a first aspect, the present application provides a screening device for pill-shaped medicine production,

[0051] With reference to Figure 1 , the screening device 100 comprises a bearing base 101, a screening base body 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 body 103, and a stacked screening assembly 1 installed at the top of the screening base body 103. The bearing base 101 is placed on a horizontal working surface, and the high-frequency micro-amplitude vibration of the vibration motor 104 causes the material in the stacked screening assembly 1 to form a stable and controllable spiral vortex motion, thereby ensuring the uniformity of the distribution of the material on the screen surface.

[0052] With reference to Figure 1 , Figure 2 and Figure 3 , the stacked screening assembly 1 comprises an upper layer screening frame 11 and a lower layer screening frame 12 coaxially arranged and installed at the top of the screening base body 103, a discharging screen 13 with a plurality of discharging screen holes 131 embedded between the upper layer screening frame 11 and the lower layer screening frame 12, a powder guide pipe 14 through-connection connected to the side wall of the lower layer screening frame 12, and a particle guide pipe 15 through-connection connected to the side wall of the upper layer screening frame 11.

[0053] The screening device 100 further comprises a top cover 2 wrapped on the upper layer screening frame 11 and a pre-dispersion mechanism 3 installed inside the top cover 2. The top cover 2 is wrapped on the upper layer screening frame 11 and has a feeding port 21 opened at the center of the top. The pre-dispersion mechanism 3 comprises a ring-shaped shunt screen plate 31 coaxially installed inside the top cover 2, a plurality of vertical column rods 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 opened on the surface of the ring-shaped shunt screen plate 31.

[0054] The screening device 100 adopts the cooperative design of the pre-dispersion mechanism 3 and the stacked screening assembly 1, realizes the efficient three-stage screening of the material, the annular shunt sieve plate 31 performs preliminary sorting on the material through the shunt sieve holes 34 on the surface, the qualified particles and powders vertically fall to the center area of the discharge 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 materials 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, prompting the large-diameter material to form a centrifugal diffusion motion at the outer edge of the screen, and combining with the side-through powder guide pipe 14 and the particle guide pipe 15, the precise separation of materials of different particle sizes is realized. At the same time, the annular shunt sieve plate 31 and the top cover 2 are rigidly connected through the stand column 32, which not only ensures the stability of the pre-dispersion mechanism 3, but also forms a involute distribution track during the vibration transmission process, significantly improving the uniformity of material distribution.

[0055] Referring to Figure 3 and Figure 4 , the lower limit value of the aperture diameter of the shunt sieve hole 34 of the annular shunt sieve plate 31 is not less than the upper limit value of the aperture diameter of the discharge sieve hole 131 of the discharge screen 13. The screening device 100 strictly limits the matching relationship between the lower limit value of the aperture diameter of the shunt sieve hole 34 of the annular shunt sieve plate 31 and the upper limit value of the aperture diameter of the discharge sieve hole 131 of the discharge screen 13, and constructs a cascade filtering system of the pre-screening stage and the main screening process. Specifically, the lower limit value of the aperture diameter of the shunt sieve hole 34 of the annular shunt sieve plate 31 is always not less than the upper limit value of the aperture diameter of the discharge sieve hole 131 of the discharge screen 13. This size constraint ensures that under the action of vibration excitation, the material meeting the main screening requirements can completely penetrate the shunt sieve hole 34 of the annular shunt sieve plate 31 and directly enter the low-vibration-amplitude working area in the center area of the discharge screen 13 for accurate screening, thereby completely avoiding unnecessary interception of qualified materials by the annular shunt sieve plate 31. At the same time, the annular gap flow channel 33 directionally transports the oversized material to the high-vibration-active area at the edge of the discharge screen 13, and through the cooperative action of the differential vibration parameters in the two areas, effectively solves the problem of local accumulation caused by material path blockage in the pre-screening process.

[0056] The outer side wall of the annular shunt sieve plate 31 is circumferentially equidistantly provided with a plurality of radially distributed flow guide rods 35, the flow guide rods 35 are arranged in a divergent manner along the radial direction of the annular shunt sieve plate 31, and the gap gradually expanding structure 36 with flow guiding function is formed between adjacent two flow guide rods 35.

[0057] The material dynamic guiding and controlling system is constructed by the divergent extension arrangement of the flow guide rods 35 and the gap expanding structure 36 between the two adjacent flow guide rods 35. The gap expanding structure 36 between the two adjacent flow guide rods 35 forms a flow guiding channel gradually increasing from the center to the outer edge, which guides the large particle materials to migrate along the divergent trajectory to the edge area of the discharging screen 13 under the action of the centrifugal field. The gradient expansion feature of the gap expanding structure 36 accurately matches the vibration intensity gradient distribution of the discharging screen 13 from the center to the edge, effectively eliminating the local accumulation of materials caused by the single flow guiding path in the traditional equipment. The axial and radial components generated by the flow guide rods 35 in the gap expanding area work together to ensure the continuous dissociation of the caked particles during migration, which significantly reduces the probability of material accumulation from the center to the edge transition area of the discharging screen 13 in the physical structure.

[0058] The flow guide rods 35 are integrally formed by spring steel. The cross-sectional area of the rod body of each flow guide rod 35 linearly decreases from the connecting end near the outer side wall of the annular distribution screen 31 to the free end, and the outer surface of the rod body of the flow guide rod 35 is mirror polished.

[0059] Referring to Figure 1 , Figure 5 , Figure 6 and Figure 7 , the lower screen frame 12 includes a lower annular side wall 121 through which the powder guide pipe 14 penetrates, a lower mounting ring 123 fixed to the outer peripheral top of the lower annular side wall 121, and an L-shaped clamping piece 124 vertically welded to the top surface of the lower mounting ring 123 and having an axial extension 1241 and a radial extension 1242. The upper screen frame 11 includes an upper annular side wall 111 through which the particle guide pipe 15 penetrates. The bottom end of the upper annular side wall 111 forms an interference fit with the axial extension 1241 of the L-shaped clamping piece 124. The circumferential edge of the discharging screen 13 is roll-pressed 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 1241 and the upper annular side wall 111.

[0060] The axial extension 1241 of the L-shaped clamping piece 124 and the bottom end of the upper annular side wall 111 form a radial extrusion force, which can automatically correct the axial alignment accuracy of the screening frame during vertical assembly, effectively preventing sealing failure caused by eccentric vibration. On the other hand, when the discharge screen 13 is installed, the extrusion force can tightly support the discharge screen 13 between the upper annular side wall 111. At the same time, the embedded edge 112 of the discharge screen 13 formed by rolling is tightly clamped in the annular gap 113 between the axial extension 1241 of the L-shaped clamping piece 124 and the upper annular side wall 111. This design makes the load on the edge of the discharge screen 13 evenly distributed to the entire contact surface, effectively preventing local stress concentration on the edge of the discharge screen 13 and preventing plastic deformation of the discharge screen 13.

[0061] The radial extension 1242 of the L-shaped clamping piece 124 is provided with an adjustable locking ring 16, and the end of the embedded edge 112 of the discharge screen 13 is bent to cover the outer surface of the radial extension 1242. The bent part 1121 is fixed on the outer surface of the radial extension 1242 by the radial clamping force of the adjustable locking ring 16.

[0062] By setting the adjustable locking ring 16 outside the radial extension 1242 of the L-shaped clamping piece 124, the bent part 1121 of the embedded edge 112 of the discharge screen 13 can bear the radial clamping force of the adjustable locking ring 16, so as to ensure that the bent part 1121 of the embedded edge 112 of the discharge screen 13 and the outer surface of the radial extension 1242 of the L-shaped clamping piece 124 form a tight annular contact surface. This design can significantly improve the tearing resistance of the edge of the discharge screen 13 by increasing the contact area. On the other hand, by using the elastic deformation characteristics of the adjustable locking ring 16, the pressure of the adjustable locking ring 16 on the bent part 1121 of the embedded edge 112 of the discharge screen 13 can be dynamically adjusted according to the installation requirements of the discharge screen 13 with different thicknesses, achieving stable and reliable assembly effect.

[0063] The outer periphery of the upper annular side wall 111 is provided with an upper mounting ring 114 coaxial with it. The upper mounting ring 114 is coaxially sleeved with the lower mounting ring 123, and the outer part of the upper mounting ring 114 and the lower mounting ring 123 is provided with an outer clamp 17.

[0064] By setting the coaxial upper mounting ring 114 at the outer peripheral bottom of the upper annular side wall 111, a double-ring positioning structure is formed with the lower mounting ring 123, which cooperates with the externally sleeved outer clamp 17 to generate a uniform radial restraint force. This structure design achieves double technical effects: on the one hand, the precise fit of the double-ring positioning structure ensures the concentricity precision of the assembly of the upper and lower screening frames, effectively reducing wear and tear caused by eccentric operation; on the other hand, the open hoop structure of the outer clamp 17 allows the upper and lower mounting ring sets (the upper mounting ring 114 and the lower mounting ring 123) to be quickly separated and maintained under the premise of maintaining the complete installation state of the lower screen 13, significantly improving the convenience of equipment maintenance.

[0065] The inner peripheral surface of the upper annular side wall 111 is fixedly connected with an annular pressure stabilizing member 18, which includes a wave-shaped elastic plate 181 coaxially arranged with the upper annular side wall 111. The bottom edge of the wave-shaped elastic plate 181 extends downward and forms a contact band 182, which abuts against the top end of the axially extending portion 1241 of the L-shaped clamping member 124. The wave-shaped elastic plate 181 is provided with a tapered protrusion, and a wedge-shaped deformation space 183 is formed between the tapered protrusion and the inner peripheral surface of the upper annular side wall 111.

[0066] By arranging the annular pressure stabilizing member 18 with the wave-shaped elastic plate 181 on the inner peripheral surface of the upper annular side wall 111, the annular pressure stabilizing member 18 maintains a stable pressure holding state on the top end of the clamping member in the axial direction, while allowing a controllable amplitude of relative sliding motion between the upper annular side wall 111 and the lower annular side wall 121. The special structure design of the wave-shaped elastic plate 181 not only ensures the maintenance of the pre-tightening force during assembly, but also absorbs vibration energy during operation through elastic deformation, thereby comprehensively improving the running stability and fatigue resistance of the screening device 100 under dynamic working conditions.

[0067] The implementation principle of the screening device for pellet pharmaceutical production according to an embodiment of the present application is as follows: the screening device 100 realizes primary material separation through the shunt screen holes 34 of the annular shunt screen plate 31, and the qualified particles fall vertically into the center area of the lower screen 13, while the oversize particles are guided to the edge through the gap widening structure 36 of the flow guide rod 35; the L-shaped clamping member 124 is in interference fit with the upper annular side wall 111 to ensure the coaxiality of the assembly, and the clamping edge 112 clamping the lower screen 13 avoids stress concentration; the adjustable locking ring 16 dynamically adjusts the screen pressing force; the double-ring positioning structure cooperates with the outer clamp 17 to maintain the concentricity, and the wave-shaped elastic plate 181 absorbs vibration energy, thereby realizing the unity of stable screening and convenient maintenance.

[0068] In a second aspect, the present application provides a screening method for pellet pharmaceutical production, which adopts the following technical scheme:

[0069] A screening method for pill production, applied to the screening device for pill production in the first aspect, the screening method comprises:

[0070] S1: the mixture is put into through the feeding port 21, so that the material first contacts with the annular shunt sieve plate 31, wherein the powder particles with a particle size smaller than the shunt sieve hole 34 directly pass through the shunt sieve hole 34 to form a central discharge flow;

[0071] S2: the particles with a particle size larger than the shunt sieve hole 34 do not pass through the shunt sieve hole 34, and the particles are diffused to the outer periphery along the annular gap flow channel 33, and form a spiral progressive outer edge distribution under the action of the excitation force of the vibration motor 104;

[0072] S3: the central discharge flow vertically falls to the central region of the discharge screen 13, and the material in the outer edge distribution slides along the inner wall of the upper screening frame 11 to the edge region of the discharge screen 13;

[0073] S4: the gradient vibration field of the lower screening frame 12 drives the material in the central region to produce axial jumping screening, and simultaneously makes the material in the edge region form a centrifugal diffusion motion;

[0074] S5: the fine powder material passing through the discharge screen hole 131 is collected through the powder discharge pipe 14, and the large particle material not passing through the screen hole is discharged through the particle discharge pipe 15.

[0075] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "vertical", "horizontal" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

Claims

1. A screening device for producing pills, comprising a supporting base, a screening base body connected vertically to the upper end of the supporting base by means of a plurality of springs, and a vibrating motor fixedly installed at the bottom of the screening base body, characterized in that, The screening device further comprises: The stacked screening assembly comprises an upper layer screening frame and a lower layer screening frame coaxially arranged on the top of the screening base body, and a discharging screen with a plurality of discharging screen holes is arranged between the upper layer screening frame and the lower layer screening frame; the side wall of the lower layer screening frame is connected with a powder discharge pipe in a penetrating manner, and the side wall of the upper layer screening frame is connected with a particle discharge pipe in a penetrating manner; A top cover is arranged on the upper layer screening frame, and a feeding opening is arranged at the center of the top of the top cover; The pre-dispersion mechanism comprises a ring-shaped distribution sieve plate coaxially arranged in the inside of the top cover, a plurality of vertical columnar rods connected between the edge of the ring-shaped distribution sieve plate and the inner top surface of the top cover, and an annular gap flow channel is formed between the ring-shaped distribution sieve plate and the inner wall of the top cover; a plurality of distribution screen holes are uniformly arranged on the surface of the ring-shaped distribution sieve plate.

2. The screening apparatus for pellet pharmaceutical production according to claim 1, characterized in that, The lower limit of the aperture of the distribution screen hole of the ring-shaped distribution sieve plate is not less than the upper limit of the aperture of the discharging screen hole of the discharging screen.

3. The screening device for the production of pellets according to claim 2, characterized in that: A plurality of flow guide rods are equidistantly arranged on the outer side wall of the ring-shaped distribution sieve plate in a radial distribution manner, the flow guide rods are arranged in a divergent manner along the radial direction of the ring-shaped distribution sieve plate, and a gap gradually expanding structure with a flow guiding function is formed between adjacent two flow guide rods.

4. The screening apparatus for pellet pharmaceutical production according to claim 3, characterized in that: The flow guide rod is integrally formed by spring steel, the cross-sectional area of the rod body of each flow guide rod linearly decreases from the connecting end close to the outer side wall of the ring-shaped distribution sieve plate to the free end, and the outer surface of the rod body of the flow guide rod is mirror-polished.

5. The screening apparatus for pellet pharmaceutical production according to claim 1, characterized in that: The lower layer screening frame comprises a lower annular side wall penetrating the powder discharge pipe, a lower layer 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 layer mounting ring and having an axial extension and a radial extension; the upper layer screening frame comprises an upper annular side wall penetrating the particle discharge pipe, the bottom end of the upper annular side wall is in interference fit with the axial extension of the L-shaped clamping piece, the circumferential edge of the discharging screen is formed into an embedded edge with a thickness of 2-3 mm through rolling, and the embedded edge is clamped in the annular gap formed between the axial extension and the upper annular side wall.

6. The screening apparatus for pellet pharmaceutical production according to claim 5, characterized in that: The radial extension of the L-shaped clamping piece is provided with an adjustable locking ring, the end of the embedded edge of the discharging screen is formed into a bending part covering the outer surface of the radial extension, and the bending part is press-fitted and fixed on the outer surface of the radial extension through the radial clamping force of the adjustable locking ring.

7. The screening apparatus for pellet pharmaceutical production according to claim 5, characterized in that: The outer periphery of the bottom of the upper annular side wall is provided with an upper layer mounting ring coaxial with the upper annular side wall, the upper layer mounting ring is coaxially sleeved with the lower layer mounting ring, and an outer clamp is externally sleeved with the upper layer mounting ring and the lower layer mounting ring.

8. The screening device for the production of pellets according to claim 7, characterized in that: The inner periphery of the upper annular side wall is fixedly connected with a ring-shaped pressure stabilizing member, the ring-shaped pressure stabilizing member comprises a wave-shaped elastic plate coaxially arranged with the upper annular side wall, the bottom edge of the wave-shaped elastic plate extends downward and forms a contact belt, and the contact belt is abutted against the top end of the axial extension of the L-shaped clamping piece.

9. The screening device for the production of pellets according to claim 8, characterized in that: A conical protruding part is arranged on the wave-shaped elastic plate, and a wedge-shaped deformation space is formed between the conical protruding part and the inner periphery of the upper annular side wall.

10. A screening method for producing a pellet pharmaceutical, applied to the screening device for producing a pellet pharmaceutical according to any one of claims 1 to 9, characterized by, The screening method comprises: S1: by feeding the mixture through the feeding port, the material first contacts the annular split sieve plate, wherein the powdery particles with a particle size smaller than the split sieve hole directly pass through the split sieve hole to form a central downflow; S2: the particles with a particle size larger than the split sieve hole spread outward along the annular gap guide channel, and form a spiral progressive outer edge distribution under the action of the excitation force of the vibration motor; S3: the central downflow vertically falls to the central area of the downflow screen, and the material of the outer edge distribution slides along the inner wall of the upper sieve frame to the edge area of the downflow screen; S4: the gradient vibration field of the lower sieve frame drives the material in the central area to produce axial jumping screening, and simultaneously makes the material in the edge area form a centrifugal diffusion motion; S5: the fine powder material passing through the downflow screen hole is collected through the powder outlet pipe, and the large particle material not passing through the screen hole is discharged through the particle outlet pipe.

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