A rotary tablet press

Abstract

This utility model relates to the technical field of tablet presses, and in particular to a rotary tablet press. The present utility model proposes a rotary tablet press, including a frame and a material tray, an upper punch assembly, a lower punch assembly, a filling guide rail, a metering guide rail, a feeding mechanism, a pre-compression roller mechanism, and a main compression roller mechanism mounted on the frame. This utility model effectively improves the weight accuracy of tablets by precisely controlling the material filling amount and using a step-by-step compression process. Specifically, through the dual action of the filling impeller and the metering impeller, in conjunction with the filling guide rail and the metering guide rail, the material filling amount in the mold cavity is precisely controlled. Pre-compression and main compression are performed step-by-step to ensure uniform tablet density. The coordinated work of all components achieves effective control of tablet weight accuracy, thereby effectively improving the weight accuracy of the tablets.

Description

Technical Field

[0001] This utility model relates to the technical field of tablet presses, and in particular to a rotary tablet press. Background Technology

[0002] As a core dosage form in the pharmaceutical, food, and chemical industries, the consistency of tablet quality directly affects the safety and efficacy of products. In industrial production, tablet presses are the core equipment for high-speed compression molding of powder materials. Through a die system, high pressure is applied to the powder filling the die holes to form tablets with a predetermined shape and density.

[0003] However, the tablets produced by existing tableting machines have poor weight accuracy, resulting in a low tablet pass rate. Utility Model Content

[0004] The purpose of this invention is to provide a rotary tablet press to improve the pass rate of tablets produced by the tablet press.

[0005] To solve the above-mentioned technical problems, this utility model provides a rotary tablet press.

[0006] The rotary tablet press of this utility model includes: A material tray, which is rotatable in the circumferential direction, has a plurality of mold cavities evenly spaced in the circumferential direction; The upper punch assembly, located above the material tray, includes multiple upper punch rods that are evenly spaced along the circumference and correspond one-to-one with the upper openings of the multiple mold cavities; The lower punch assembly, located below the material tray, includes multiple lower punch rods arranged evenly spaced along the circumference and corresponding one-to-one with the lower openings of the multiple mold cavities; Packing guide rail; Measuring guide rail; A feeding mechanism for adding material to a material tray includes a feeding housing and a filling impeller and a metering impeller located in the feeding housing. The filling impeller is used to cooperate with the lower punch and the filler guide to fill the material into the mold cavity. The metering impeller is used to cooperate with the lower punch and the metering guide to remove excess material so as to maintain the material in the mold cavity at a set filling amount. A pre-compression wheel mechanism is used to press the upper punch and the lower punch to pre-compress the material; The main pressure roller mechanism is used to press the upper punch and the lower punch to compress the pre-compressed material to form tablets.

[0007] Furthermore, the feeding mechanism also includes a transfer impeller. The feeding housing includes a first chamber and a second chamber arranged vertically and communicating with each other. The transfer impeller is located in the first chamber, and the filling impeller and the metering impeller are located in the second chamber. The transfer impeller is used to transfer the material in the first chamber to the second chamber. The distance between the filling impeller and the metering impeller and the central axis of the material tray is less than the distance between the transfer impeller and the central axis of the material tray.

[0008] Furthermore, the feeding mechanism also includes a material cylinder having an inlet and an outlet, the outlet being connected to the inlet of the first chamber.

[0009] Furthermore, the packing guide rail has a packing arc-shaped guide groove for guiding the sliding of the lower punch rod. The packing arc-shaped guide groove includes a first guide groove whose height gradually decreases along the circumferential direction and a second guide groove whose height remains unchanged along the circumferential direction. The position of the second guide groove corresponds to the filling impeller in the vertical direction.

[0010] Furthermore, the metering guide rail is adjacent to the packing guide rail, and the metering guide rail has a metering arc-shaped guide groove for guiding the sliding of the lower punch rod. The height of the metering arc-shaped guide groove remains constant along the circumference and is higher than the second guide groove.

[0011] Furthermore, it also includes an adjustment mechanism, which is used to guide the metering guide rail to slide in the up and down direction to adjust the metering guide rail to a specified height, thereby adjusting the set filling amount.

[0012] Furthermore, the preload wheel mechanism includes an upper preload wheel and a lower preload wheel, wherein the upper preload wheel is used to press against the upper punch rod, and the lower preload wheel is used to press against the lower punch rod.

[0013] Furthermore, the main pressure roller mechanism includes an upper main pressure roller and a lower main pressure roller, wherein the upper main pressure roller is used to press against the upper punch rod, and the lower main pressure roller is used to press against the lower punch rod.

[0014] Furthermore, it also includes a tablet ejection mechanism, which includes a tablet ejection guide rail. The tablet ejection guide rail has a tablet ejection arc-shaped guide groove for guiding the lower punch to slide. The tablet ejection arc-shaped guide groove includes a third guide groove whose height gradually increases along the circumferential direction and a fourth guide groove whose height remains unchanged along the circumferential direction, so as to control the lower punch to eject the formed tablets out of the mold cavity.

[0015] Furthermore, the tablet ejection mechanism also includes an ejection slot and a tablet rejection assembly. The ejection slot includes a qualified tablet channel, a sampling channel, and a waste tablet channel. The tablet rejection assembly is used to screen out unqualified tablets from the formed tablets and retain qualified tablets. The qualified tablet channel is used to guide the formed qualified tablets to the qualified tablet storage area. The sampling channel is used to extract samples from the formed tablets. The waste tablet channel is used to guide the formed unqualified tablets to the unqualified tablet storage area.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: During operation, the material tray achieves continuous production through circumferential rotation, and the uniform arrangement of the mold cavities ensures production stability. The upper and lower punch assemblies correspond to the upper and lower openings of the mold cavity, respectively, forming the pressing space. The filling guide and metering guide cooperate with the lower punch rod to control the material filling process. The filling impeller in the feeding mechanism performs initial material filling, while the metering impeller precisely controls the filling amount, ensuring consistent weight for each tablet. The pre-compression roller mechanism pre-compresses the material, improving density uniformity. The main compression roller mechanism completes the final compression, forming tablets that meet the requirements.

[0017] This invention effectively improves tablet weight accuracy by precisely controlling the material filling amount and using a step-by-step compression process. Specifically, through the dual action of the filling impeller and the metering impeller, in conjunction with the filling guide rail and the metering guide rail, the material filling amount in the mold cavity is precisely controlled. Pre-compression and main compression are performed in steps to ensure uniform tablet density. The coordinated work of all components achieves effective control of tablet weight accuracy, thereby significantly improving tablet weight precision. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the rotary tablet press of this utility model; Figure 2 for Figure 1 The working principle diagram of the rotary tablet press.

[0019] Figure label: 1. Frame; 2. Dust collector interface; 3. Dust collection port; 4. Ventilation port; 5. Adjustment mechanism; 10. Material tray; 21. Upper punch; 22. Lower punch; 30. Packing guide rail; 31. Packing arc-shaped guide groove; 40. Metering guide rail; 41. Metering arc-shaped guide groove; 51. Feeding housing; 52. Filling impeller; 53. Metering impeller; 54. Material cylinder; 55. Feed inlet; 56. Material level sensor; 57. Transfer impeller; 61. Upper preload roller; 62. Lower preload roller; 63. Upper main pressure roller; 64. Lower main pressure roller; 71. Film output guide rail; 72. Film blocking and rejection assembly; 73. Film output arc-shaped guide groove; 74. Qualified film channel; 75. Scrap film channel; 76. Sampling channel; 77. Blockage detection assembly. Detailed Implementation

[0020] The rotary tablet press of this utility model will now be described with reference to the schematic diagrams, which illustrate preferred embodiments of the utility model. It should be understood that those skilled in the art can modify the utility model described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the utility model. Based on the teachings of this specification, those skilled in the art can form new technical solutions through cross-combinations of different implementation methods without creating technical contradictions; such modifications should all be considered to fall within the protection scope of this patent.

[0021] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely for distinguishing the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, the term "electrical connection" can be a direct electrical connection or an indirect electrical connection through an intermediate medium.

[0024] The present invention will be described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0025] The following is in conjunction with the instruction manual appendix. Figure 1 and attached Figure 2 This paper introduces the rotary tablet press of this utility model.

[0026] like Figure 1 and Figure 2 As shown, this utility model proposes a rotary tablet press, including a frame 1 and a material tray 10, an upper punch assembly, a lower punch assembly, a filler guide rail 30, a metering guide rail 40, a feeding mechanism, a pre-compression roller mechanism, and a main pressure roller mechanism disposed on the frame 1.

[0027] The material tray 10 is circumferentially rotatable and has multiple mold cavities evenly spaced circumferentially.

[0028] The upper punch assembly is located above the material tray 10 and includes multiple upper punch rods 21 arranged evenly spaced circumferentially and corresponding one-to-one with the upper opening of the mold cavity. The lower punch assembly is located below the material tray 10 and includes multiple lower punch rods 22 arranged evenly spaced circumferentially and corresponding one-to-one with the lower opening of the mold cavity.

[0029] The feeding mechanism is used to add material to the material tray 10, including a feeding housing 51 and a filling impeller 52 and a metering impeller 53 located in the feeding housing 51. The filling impeller 52 is used to cooperate with the lower punch 22 and the filler guide 30 to fill the material into the mold cavity, and the metering impeller 53 is used to cooperate with the lower punch 22 and the metering guide 40 to remove excess material so as to maintain the material in the mold cavity at a set filling amount.

[0030] The pre-compression roller mechanism is used to press the upper punch 21 and the lower punch 22 to pre-compress the material. The main pressure roller mechanism is used to press the upper punch 21 and the lower punch 22 to compress the pre-compressed material to form tablets.

[0031] During operation, the material tray 10 achieves continuous production through circumferential rotation, and the uniform arrangement of the mold cavity ensures production stability. The upper and lower punch components correspond to the upper and lower openings of the mold cavity, respectively, forming a pressing space. The filling guide rail 30 and the metering guide rail 40 cooperate with the lower punch rod 22 to control the material filling process. The filling impeller 52 in the feeding mechanism performs initial material filling, and the metering impeller 53 precisely controls the filling amount to ensure consistent weight of each tablet. The pre-compression roller mechanism pre-compresses the material to improve density uniformity. The main compression roller mechanism completes the final compression, forming tablets that meet the requirements.

[0032] This invention effectively improves tablet weight accuracy through precise control of material filling amount and a step-by-step pressing process. Specifically, the material filling amount in the mold cavity is precisely controlled by the dual action of the filling impeller 52 and the metering impeller 53, in conjunction with the filling guide rail 30 and the metering guide rail 40. Pre-compression and main compression are carried out in steps to ensure uniform tablet density. The coordinated work of all components achieves effective control of tablet weight accuracy, thereby effectively improving tablet weight accuracy.

[0033] In some embodiments, the frame 1 is also provided with a dust collector interface 2 and a dust removal port 3. By connecting a dust collector to the dust collector interface 2, dust in the rotary tablet press can be discharged from the dust removal port 3. In addition, in order to maintain stable air pressure inside the rotary tablet press, the frame 1 is also provided with a ventilation port 4.

[0034] In some embodiments, the feeding mechanism further includes a transfer impeller 57. The feeding housing 51 includes a first chamber and a second chamber arranged vertically and communicating with each other. The transfer impeller 57 is located in the first chamber, and the filling impeller 52 and the metering impeller 53 are located in the second chamber. The transfer impeller 57 is used to transfer material in the first chamber to the second chamber. The distance between the filling impeller 52 and the metering impeller 53 and the central axis of the material tray 10 is less than the distance between the transfer impeller 57 and the central axis of the material tray 10.

[0035] Specifically, the transfer impeller 57 can adopt a helical blade structure or a paddle blade structure to achieve smooth material conveying from the first chamber to the second chamber. The connection between the first chamber and the second chamber includes, but is not limited to, a vertical channel, an inclined slide, or a guide channel. As a preferred embodiment, a guide cone can be provided at the top of the first chamber to make the material more evenly distributed in the working area of ​​the transfer impeller 57.

[0036] A material gradient processing system was constructed through a layered cavity design and differentiated impeller arrangement, optimizing the material flow path: the material is first widely dispersed in the first chamber, and then quantitatively filled in the second chamber. Specifically, the first chamber uses a transfer impeller 57 for initial material distribution, while the second chamber uses a filling impeller 52 and a metering impeller 53 for precise filling. The larger distance between the transfer impeller 57 and the central axis of the material tray 10 facilitates the placement of the feeder, making it easier for the material to enter the feeding housing 51, and also expands the material dispersion range. The smaller wheelbase of the filling impeller 52 and metering impeller 53 in the second chamber allows the material to enter the mold cavity more accurately, achieving precise metering, while spatial isolation avoids interference between different processes.

[0037] Furthermore, in some embodiments, in order to make the feeding more stable, the feeding mechanism further includes a material cylinder 54 having an inlet 55 and an outlet. The outlet is connected to the inlet of the first chamber of the feeding housing 51, and material can be added to the feeding housing 51 through the inlet 55.

[0038] The material cylinder 54 can be cylindrical or conical, and its material is stainless steel or engineering plastic. The connection between the outlet of the material cylinder 54 and the inlet of the first chamber can be a flange connection, a threaded connection, or a quick-clamp connection. The material cylinder 54 can be equipped with a vibration device to prevent material accumulation, or a level sensor 56 can be installed to monitor the material level. An anti-stick coating can be applied to the inner wall of the material cylinder 54, and a regulating valve can be installed at the outlet to control the material flow rate. The material cylinder 54 can be designed as a detachable structure for easy cleaning and maintenance, or it can use a transparent observation window to monitor the material status in real time. Specifically, a level detector can be installed at the transparent observation window to monitor the material status in real time. During material feeding, intermittent or continuous feeding methods can be used, such as using a vacuum feeder or a lifting feeder.

[0039] By establishing a direct connection between the material cylinder 54 and the first chamber, stable material conveying is achieved. The material cylinder 54, acting as a material storage container, avoids intermediate steps in the material conveying process through its outlet direct connection to the inlet of the first chamber, reducing the risk of material blockage.

[0040] Furthermore, in some embodiments, the packing guide rail 30 has a packing arc-shaped guide groove 31 for guiding the sliding of the lower punch 22. The packing arc-shaped guide groove 31 includes a first guide groove whose height gradually decreases along the circumferential direction and a second guide groove whose height remains unchanged along the circumferential direction. The position of the second guide groove corresponds to the filling impeller 52 in the vertical direction.

[0041] The filler arc-shaped guide groove 31 can be manufactured using a segmented process. The first guide groove is milled with a gradually varying height using a CNC machine tool, while the second guide groove is milled with a constant height. The inclination angle of the first guide groove can be set to 5°-15°, with the specific value adjusted according to the material flowability and filling speed requirements. The axial position of the second guide groove is aligned with the center line of the filling impeller 52 using a laser positioning device to ensure that the overlap of their working areas reaches the set accuracy. The surface of the guide groove can be hardened, for example, by using a tungsten carbide coating, to reduce the coefficient of friction when the lower punch 22 slides.

[0042] The filling guide rail 30 achieves precise control over the movement of the lower punch 22 by setting a filling arc-shaped guide groove 31 with varying height. The design of the first guide groove, with its gradually decreasing height, allows the lower punch 22 to descend smoothly during the filling process, ensuring uniform material filling of the mold cavity. The second guide groove maintains a constant height and corresponds to the position of the filling impeller 52, ensuring that the lower punch 22 maintains a stable height within the working area of ​​the filling impeller 52, guaranteeing consistent material filling volume. By precisely controlling the movement trajectory of the lower punch 22, the problem of inaccurate material filling volume control during the filling process is effectively solved. This embodiment, by setting a smooth transitional height change area and a stable working area, ensures both material flowability in the initial filling stage and filling stability at key stations, effectively reducing weight differences between tablets.

[0043] Furthermore, in some embodiments, the metering guide rail 40 is adjacent to the filler guide rail 30, and the metering guide rail 40 has a metering arc-shaped guide groove 41 for guiding the sliding of the lower punch 22. The height of the metering arc-shaped guide groove 41 remains constant along the circumference and is higher than the second guide groove.

[0044] The constant height of the metering arc-shaped guide groove 41 can be achieved through integral casting or precision grinding after segmented assembly. The height difference design can be achieved by adjusting the thickness of the mounting base of the metering guide rail 40 or by using a shim fine-tuning mechanism. The adjacent arrangement of the metering guide rail 40 and the filler guide rail 30 can be achieved by bolt connection or integral molding process, and the joint surface must ensure a smooth transition to avoid jamming of the lower punch 22.

[0045] In this embodiment, a stepped guide structure is formed by the metering guide rail 40 with a fixed height and the filling guide rail 30. When the filled punch 22 enters the metering station, the metering impeller 53 rotates to scrape off the excess material that exceeds the height of the metering arc guide groove 41. Since the height of the guide groove is constant and precisely higher than the second guide groove of the filling guide rail 30, the compression stroke of the filling material is fixed each time, thereby improving the control accuracy of the filling amount.

[0046] Furthermore, in some embodiments, the rotary tablet press also includes an adjustment mechanism 5, which is used to drive the metering guide rail 40 to slide in the up and down direction to adjust the metering guide rail 40 to a specified height, thereby adjusting the set filling amount.

[0047] The adjustment mechanism 5 can achieve vertical position adjustment using a lead screw and nut pair, a worm gear lead screw mechanism, and a servo motor. Specifically, the servo motor drives a high-precision lead screw via a worm gear lead screw mechanism, and the nut on the high-precision lead screw drives a lifting rod, which in turn drives the metering guide rail 40 to achieve precise displacement.

[0048] Furthermore, in some embodiments, the preload wheel mechanism includes an upper preload wheel 61 and a lower preload wheel 62, wherein the upper preload wheel 61 is used to press against the upper punch 21, and the lower preload wheel 62 is used to press against the lower punch 22.

[0049] The upper preload roller 61 and lower preload roller 62 can be made of metal, and their surfaces can be coated with a wear-resistant coating to extend their service life. The diameter range of the preload rollers can be adjusted according to the punch spacing and the rotation speed of the feed tray 10. The contact surface between the preload roller and the punch can be designed as an arc to reduce contact stress. The pressure adjustment of the preload rollers can be achieved through a spring mechanism or a hydraulic mechanism. As a preferred embodiment, the preload rollers can be equipped with a pressure sensor to monitor pressure changes in real time during the preloading process.

[0050] By setting up a symmetrical pre-compression roller mechanism, bidirectional pre-compression of the material is achieved. Specifically, the upper pre-compression roller 61 applies downward pressure to the upper punch 21, while the lower pre-compression roller 62 applies upward pressure to the lower punch 22, ensuring that the material is uniformly pre-compressed before entering the main pressure roller. This effectively reduces the looseness of the material, eliminates excess air, improves filling uniformity, and avoids material displacement caused by unilateral pressure.

[0051] Furthermore, in some embodiments, the main pressure roller mechanism includes an upper main pressure roller 63 and a lower main pressure roller 64, wherein the upper main pressure roller 63 is used to press against the upper punch 21, and the lower main pressure roller 64 is used to press against the lower punch 22.

[0052] Specifically, the upper main pressure roller 63 and the lower main pressure roller 64 can be made of integral forged steel wheels or a split composite structure, and the wheel surface is hardened to improve wear resistance. Specifically, the main pressure rollers can be equipped with a hydraulic buffer device, and the applied pressure is monitored in real time by a pressure sensor.

[0053] The symmetrically arranged upper and lower main pressure rollers 64 apply pressure synchronously, so that the material in the mold cavity is subjected to a balanced axial compressive force. Since the upper and lower punches 22 are subjected to force at the same time, the interlayer shearing phenomenon of material caused by unilateral pressure is effectively avoided.

[0054] Furthermore, in some embodiments, the rotary tablet press further includes a tablet ejection mechanism, which includes a tablet ejection guide rail 71 having an arc-shaped guide groove 73 for guiding the lower punch 22 to slide. The arc-shaped guide groove 73 includes a third guide groove whose height gradually increases along the circumferential direction and a fourth guide groove whose height remains unchanged along the circumferential direction, so as to control the lower punch 22 to eject the formed tablets out of the mold cavity.

[0055] Specifically, the arc-shaped guide groove 73 can be of integral or split type. The integral type uses CNC machining to ensure the groove's contour accuracy, while the split type uses detachable inserts for quick replacement after wear. The surface of the guide groove can be hardened or inlaid with wear-resistant materials to extend its service life. As a preferred embodiment, a lubrication channel can be provided at the bottom of the guide groove to reduce sliding friction through a centralized oil supply system. The installation position of the sheet ejection guide rail 71 can be finely adjusted using adjusting bolts to ensure precise matching with the movement trajectory of the lower punch 22.

[0056] The constant-height guide groove design ensures that the lower punch 22 maintains a stable vertical stroke during ejection, avoiding the stroke fluctuation problem caused by traditional variable-height guide grooves. Specifically, the constant-height structural feature guarantees the repeatability of each ejection action, allowing the tablet to detach completely from the mold cavity without breakage or residue.

[0057] Furthermore, in some embodiments, the tablet ejection mechanism further includes an ejection slot and a tablet rejection assembly 72. The ejection slot includes a qualified tablet channel 74, a waste tablet channel 75, and a sampling channel 76. The tablet rejection assembly 72 is used to screen out unqualified tablets from the formed tablets and retain qualified tablets. The qualified tablet channel 74 is used to guide the formed qualified tablets to a qualified tablet storage area. The waste tablet channel 75 is used to guide the formed unqualified tablets to an unqualified tablet storage area. The sampling channel 76 is used to extract samples from the formed tablets.

[0058] The tablet rejection assembly 72 can be implemented using a combination of a photoelectric sensor and a mechanical baffle. Specifically, when the photoelectric sensor detects a pressure deviation in a single tablet, the judgment module determines whether it is within the acceptable range. Tablets exceeding the range are rejected by a pneumatic rejection actuator. When N consecutive tablets exceed the tolerance, the mechanical baffle automatically opens, guiding the batch of tablets in that segment into the waste tablet channel 75. As a preferred embodiment, the tablet rejection assembly 72 can also employ a weight detection device in conjunction with a pneumatic sorting mechanism. Real-time weighing determines whether the tablet weight meets the standard, and a pneumatic nozzle blows the out-of-tolerance tablets into the waste tablet channel 75. The acceptable tablet channel 74 and the waste tablet channel 75 of the tablet outlet can adopt an inclined slide design. The sampling channel 76 is located at the end of the acceptable tablet channel 74 and is used for periodic sampling to detect tablet parameters.

[0059] In addition, the tablet dispensing mechanism also includes a tablet blockage detection component 77, which is used to promptly alert staff when tablets block the dispensing slot.

[0060] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A rotary tablet press, characterized in that, include: A material tray, which is rotatable in the circumferential direction, has a plurality of mold cavities evenly spaced in the circumferential direction; The upper punch assembly, located above the material tray, includes multiple upper punch rods that are evenly spaced along the circumference and correspond one-to-one with the upper openings of the multiple mold cavities; The lower punch assembly, located below the material tray, includes multiple lower punch rods arranged evenly spaced along the circumference and corresponding one-to-one with the lower openings of the multiple mold cavities; Packing guide rail; Measuring guide rail; A feeding mechanism for adding material to a material tray includes a feeding housing and a filling impeller and a metering impeller located in the feeding housing. The filling impeller is used to cooperate with the lower punch and the filler guide to fill the material into the mold cavity. The metering impeller is used to cooperate with the lower punch and the metering guide to remove excess material so as to maintain the material in the mold cavity at a set filling amount. A pre-compression wheel mechanism is used to press the upper punch and the lower punch to pre-compress the material; The main pressure roller mechanism is used to press the upper punch and the lower punch to compress the pre-compressed material to form tablets.

2. The rotary tablet press according to claim 1, characterized in that, The feeding mechanism further includes a transfer impeller. The feeding housing includes a first chamber and a second chamber arranged vertically and communicating with each other. The transfer impeller is located in the first chamber, and the filling impeller and the metering impeller are located in the second chamber. The transfer impeller is used to transfer the material in the first chamber to the second chamber. The distance between the filling impeller and the metering impeller and the central axis of the material tray is less than the distance between the transfer impeller and the central axis of the material tray.

3. The rotary tablet press according to claim 2, characterized in that, The feeding mechanism also includes a material cylinder, which has an inlet and an outlet, and the outlet is connected to the inlet of the first chamber.

4. The rotary tablet press according to claim 1, characterized in that, The packing guide rail has a packing arc-shaped guide groove for guiding the sliding of the lower punch rod. The packing arc-shaped guide groove includes a first guide groove whose height gradually decreases along the circumference and a second guide groove whose height remains unchanged along the circumference. The position of the second guide groove corresponds to the filling impeller in the vertical direction.

5. The rotary tablet press according to claim 4, characterized in that, The metering guide rail is adjacent to the packing guide rail. The metering guide rail has a metering arc-shaped guide groove for guiding the sliding of the lower punch rod. The height of the metering arc-shaped guide groove remains constant along the circumference and is higher than the second guide groove.

6. The rotary tablet press according to claim 5, characterized in that, It also includes an adjustment mechanism, which is used to guide the metering guide rail to slide in the up and down direction to adjust the metering guide rail to a specified height, thereby adjusting the set filling amount.

7. The rotary tablet press according to claim 1, characterized in that, The preload wheel mechanism includes an upper preload wheel and a lower preload wheel. The upper preload wheel is used to press down on the upper punch rod, and the lower preload wheel is used to press down on the lower punch rod.

8. The rotary tablet press according to claim 1, characterized in that, The main pressure roller mechanism includes an upper main pressure roller and a lower main pressure roller. The upper main pressure roller is used to press down on the upper punch rod, and the lower main pressure roller is used to press down on the lower punch rod.

9. The rotary tablet press according to claim 1, characterized in that, It also includes a tablet ejection mechanism, which includes a tablet ejection guide rail. The tablet ejection guide rail has a tablet ejection arc-shaped guide groove for guiding the lower punch to slide. The tablet ejection arc-shaped guide groove includes a third guide groove whose height gradually increases along the circumferential direction and a fourth guide groove whose height remains unchanged along the circumferential direction, so as to control the lower punch to eject the formed tablets out of the mold cavity.

10. The rotary tablet press according to claim 9, characterized in that, The tablet ejection mechanism further includes an ejection slot and a tablet rejection assembly. The ejection slot includes a qualified tablet channel, a sampling channel, and a waste tablet channel. The tablet rejection assembly is used to screen out unqualified tablets from the formed tablets and retain qualified tablets. The qualified tablet channel is used to guide the formed qualified tablets to the qualified tablet storage area. The sampling channel is used to extract samples from the formed tablets. The waste tablet channel is used to guide the formed unqualified tablets to the unqualified tablet storage area.

Images