A high-speed rotary tablet press for pharmaceutical use

Abstract

The utility model provides a kind of high-speed rotary tablet press for pharmacy, including carousel, the carousel is divided into inner rail and outer rail, the inner side of the outer rail is fixedly connected with several middle moulds;Quantitative feeding valve is built-in in the middle mould, the middle mould is movably connected with punch rod;The bottom end of the punch rod is fixedly connected with a tablet slot;One high-pressure gas pipe is provided at the side of the carousel, the end of the high-pressure gas pipe is fixedly connected with filter.The utility model has the advantages that air is filtered in filter, internal impurities of air are removed, then output through cleaning pipe and spray head, spray head is specially designed, annular, dry high-pressure gas stream is output from spray head to the inside of tablet slot from bottom to top, can clean and dry the residual medicine powder inside comprehensively, can effectively prevent medicine powder from remaining in the inside of tablet slot, does not affect the dosage of subsequent tablets, guarantees the precision of medicine dosage.

Description

Technical Field

[0001] This utility model relates to the field of tablet preparation technology, and in particular to a high-speed rotary tablet press for pharmaceutical use. Background Technology

[0002] Rotary tablet presses are core equipment in the pharmaceutical industry for tablet production. Their core working unit typically includes a rotating turntable with multiple dies equipped with intermediate molds and punches. As the turntable rotates, the punches move up and down along tracks, completing processes such as filling, pre-compression, main compression, and tablet ejection.

[0003] The challenges faced by existing technologies are mainly twofold:

[0004] Rapid production changeover and dosage accuracy: When it is necessary to produce tablets with different dosages or different formulations, traditional feeding methods (such as forced feeders) often require manual adjustment or replacement of parts, which is time-consuming and labor-intensive, and it is difficult to quickly and accurately adjust the amount of powder to be compressed each time, making it difficult to meet the needs of flexible production and small-batch customization.

[0005] Mold residue contamination: During high-speed tableting, fine drug powder inevitably adheres to the inner wall of the tableting groove at the end of the punch. If this residual powder is not removed in time, it will mix into the next batch of material, especially during batch changes, causing cross-contamination and seriously affecting drug quality. Residue can also lead to inaccurate powder content in a single filling, affecting the final weight and dosage accuracy of the tablets. Traditional manual cleaning methods during downtime are inefficient. Utility Model Content

[0006] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0007] Therefore, one objective of this invention is to provide a high-speed rotary tablet press for pharmaceutical use, in order to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0008] To achieve the above objectives, one embodiment of the present invention provides a high-speed rotary tablet press for pharmaceutical use, including a turntable, the turntable being divided into an inner rail and an outer rail, and a plurality of intermediate molds being fixedly connected to the inner side of the outer rail;

[0009] The intermediate mold has a built-in quantitative feeding valve, and a punch rod is movably connected to the intermediate mold;

[0010] A pressure groove is fixedly connected to the bottom end of the punch;

[0011] A high-pressure air pipe is provided on the side of the turntable, and a filter is fixedly connected to the end of the high-pressure air pipe;

[0012] An electrically controlled valve is fixedly connected to the bottom of the filter, and a cleaning pipe is fixedly connected to the output end of the electrically controlled valve;

[0013] The cleaning tube is fixedly connected to an upward-facing nozzle, and the inner edge of the nozzle is the air outlet.

[0014] Preferably, in any of the above solutions, the turntable is connected to the middle mold by screws, and the width of the inner rail is greater than the width of the outer rail.

[0015] The core structure of this tablet compressor, employing the above technical solution, consists of a quantitative feeding valve, a high-pressure air pipe, a filter, an electrically controlled valve, a cleaning pipe, and a nozzle. A quantitative feeding valve is designed along the powder output path, which automatically adjusts the dosage of powder required for tableting according to the needs of different drug manufacturing processes. This facilitates rapid switching between tableting processes for different drugs. The valve quantitatively delivers powder through the rotational speed and spacing of its internal rotating blades. The minimal gap between the blades and the valve body prevents material leakage while ensuring stable flow.

[0016] A cleaning station is designed next to the turntable. When the tableting chamber finishes compressing the tablets, rises and rotates, the high-pressure air pipe connects to the air pump, outputting high-pressure air. The air is filtered in the filter to remove impurities, and then output through the cleaning pipe and nozzle. The nozzle is specially designed to output a ring-shaped, dry high-pressure airflow from bottom to top to the inside of the tableting chamber, which can thoroughly clean and dry the residual powder inside. This effectively prevents powder residue inside the tableting chamber, does not affect the dosage of subsequent tablets, and ensures the accuracy of drug dosage.

[0017] Preferably, the quantitative feed valve is a rotary feed valve, as described in any of the above schemes.

[0018] The core design of this device features an independent metering valve installed above the top opening of each intermediate mold or along the integrated powder filling path. This metering valve preferably employs a rotary feeder structure. Its core principle is as follows:

[0019] Precise Dosing: The valve features internally rotating blades with precisely controllable rotation speed. The sealed spaces between the blades form individual powder chambers. By precisely adjusting the rotation speed of the blades and the spacing (volume) between them through the control system, the volume of powder falling into the die with each rotation can be precisely controlled. This is equivalent to directly controlling the amount of powder required for each tablet compression.

[0020] Quick switching: When different types or dosages of tablets need to be produced, the amount of material fed at one time can be quickly changed by simply adjusting the speed of the feed valve or the position of the blades (if there is an adjustable mechanism) through the control system, so as to achieve rapid and flexible control of the drug dosage.

[0021] Leakage prevention and flow stabilization: The gap between the valve body and the rotating blade is designed to be very small, which effectively prevents powder material from leaking during non-feeding periods and ensures that the powder flow rate during the filling process is highly stable and reliable.

[0022] Tableting actuator:

[0023] Each die is internally connected to a vertically movable punch (usually a lower punch). The bottom end of the punch (the end that extends into the die cavity during tableting) is fixedly connected to a tableting groove. This groove is typically concave and provides the surface shape for the final tablet, with its inner surface in direct contact with the powder. The punches are made of high-strength stainless steel, offering excellent wear and corrosion resistance.

[0024] Online self-cleaning system:

[0025] A specific fixed station is designated as a cleaning station on the outer perimeter of the turntable. The following cleaning components are installed at this station:

[0026] High-pressure air source: The high-pressure air pipe is fixed on the frame, and its inlet end is connected to an external high-pressure air pump to provide a dry and clean high-pressure air source.

[0027] Air purification: A filter is fixedly connected to the end of the high-pressure air pipe. The filter contains a precision filter screen (preferably made of stainless steel) to remove impurities such as oil stains, dust, and moisture that may be present in the high-pressure air, ensuring that the blown air is absolutely clean and avoiding secondary contamination of the mold or medicine.

[0028] Air path control: An electrically controlled valve is fixedly connected to the bottom of the filter. The electrically controlled valve is precisely controlled by the tablet press's control system and is responsible for opening or closing the air path to the cleaning head as needed.

[0029] Flow guidance and shaping: A cleaning tube is fixedly connected to the output end of the electronically controlled valve. The cleaning tube is designed with a 90-degree bend (such as an L-shape) so that its air outlet is precisely located and oriented directly below the tableting tank that rises to the cleaning station.

[0030] High-efficiency cleaning nozzle: A specially designed nozzle is fixedly connected to the end of the cleaning tube. The most distinctive feature of this nozzle is its upward-facing (i.e., aligned with the tablet compression groove above) nozzle design. A fine air outlet is formed around the inner edge of the nozzle. This structural design allows the nozzle to spray an upward-facing, concentrated, and extremely dry high-pressure clean airflow in a ring-shaped distribution, resembling an inverted airflow "curtain".

[0031] Preferably, of any of the above embodiments, the punch rod is made of stainless steel, and the inner diameter of the tablet pressing groove is larger than the diameter of the nozzle.

[0032] Preferably, in any of the above embodiments, the filter has a built-in stainless steel filter screen, and the cleaning tube is bent at a 90-degree angle.

[0033] Preferably, in any of the above schemes, the nozzle sprays an annular high-pressure airflow upwards, and the station where the nozzle is located is a cleaning station.

[0034] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0035] This high-speed rotary tablet press for pharmaceutical use features a quantitative feeding valve designed into the powder output path. This valve automatically adjusts the dosage of powder required for tableting according to the needs of different pharmaceutical manufacturing processes, facilitating rapid switching between tableting of different drugs. The powder is quantitatively delivered through the rotational speed and spacing of the internal rotating blades. The extremely small gap between the blades and the valve body prevents material leakage while ensuring stable flow.

[0036] A cleaning station is designed next to the turntable. When the tableting chamber finishes compressing the tablets, rises and rotates, the high-pressure air pipe connects to the air pump, outputting high-pressure air. The air is filtered in the filter to remove impurities, and then output through the cleaning pipe and nozzle. The nozzle is specially designed to output a ring-shaped, dry high-pressure airflow from bottom to top to the inside of the tableting chamber, which can thoroughly clean and dry the residual powder inside. This effectively prevents powder residue inside the tableting chamber, does not affect the dosage of subsequent tablets, and ensures the accuracy of drug dosage.

[0037] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0038] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0039] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0040] Figure 2 This is a structural schematic diagram of the present invention from a second perspective;

[0041] Figure 3 This is a structural schematic diagram of the present invention from a third-view perspective;

[0042] Figure 4 This utility model Figure 2 A magnified structural diagram of point A in the middle.

[0043] In the diagram: 1-turntable, 101-inner rail, 102-outer rail, 2-middle mold, 3-quantitative feeding valve, 4-punch rod, 5-pressing groove, 6-high pressure air pipe, 7-filter, 8-electric control valve, 9-cleaning pipe, 10-nozzle. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] like Figure 1-4 As shown, the high-speed rotary tablet press for pharmaceutical use includes a turntable 1, which is divided into an inner rail 101 and an outer rail 102. Several intermediate molds 2 are fixedly connected to the inner side of the outer rail 102.

[0047] A quantitative feeding valve 3 is built into the middle mold 2, and a punch 4 is movably connected to the middle mold 2;

[0048] A pressing groove 5 is fixedly connected to the bottom end of the punch rod 4;

[0049] A high-pressure air pipe 6 is provided on the side of the turntable 1, and a filter 7 is fixedly connected to the end of the high-pressure air pipe 6.

[0050] The bottom of the filter 7 is fixedly connected to an electric control valve 8, and the output end of the electric control valve 8 is fixedly connected to a cleaning tube 9;

[0051] The cleaning tube 9 is fixedly connected to an upward-facing nozzle 10, and the inner edge of the nozzle 10 is the air outlet.

[0052] Example 1: The quantitative feed valve 3 is specifically a rotary feed valve. The punch 4 is made of stainless steel, and the inner diameter of the tablet pressing groove 5 is larger than the diameter of the nozzle 10. The filter 7 has a built-in stainless steel filter screen, and the cleaning tube 9 is bent at a 90-degree angle. The nozzle 10 sprays an annular high-pressure airflow upwards, and the station where the nozzle 10 is located is the cleaning station.

[0053] Example 2: An independent metering valve 3 is built-in above the top opening of each intermediate mold 2 or on the integrated powder filling path. This metering valve 3 preferably adopts a rotary feeder valve structure. Its core principle is:

[0054] Precise Dosing: The valve 3 is equipped with rotating blades whose rotation speed can be precisely controlled. The sealed spaces between the blades form individual powder chambers. By precisely adjusting the rotation speed of the blades and the spacing (volume) of the blades themselves through the control system, the volume of powder falling into the intermediate mold 2 with each rotation can be precisely controlled. This is equivalent to directly controlling the amount of powder required for each tablet compression.

[0055] Quick switching: When different types or dosages of tablets need to be produced, the single feeding amount can be quickly changed by simply adjusting the speed or blade position of the feed valve 3 through the control system (if there is an adjustable mechanism), so as to achieve rapid and flexible control of the drug dosage.

[0056] Leakage prevention and flow stabilization: The gap between the valve body and the rotating blade is designed to be very small, which effectively prevents powder material from leaking during non-feeding periods and ensures that the powder flow rate during the filling process is highly stable and reliable.

[0057] Tableting actuator:

[0058] Each intermediate die 2 is movably connected to a punch 4 (usually a lower punch) that can move up and down. The bottom end of the punch 4 (the end that extends into the cavity of the intermediate die 2 during tableting) is fixedly connected to a tableting groove 5. This tableting groove 5 is typically concave and is the source of the surface shape from which the drug powder is finally compacted into tablets; its inner surface directly contacts the drug powder. The punch 4 is made of high-strength stainless steel, possessing excellent wear resistance and corrosion resistance.

[0059] Online self-cleaning system:

[0060] A specific fixed station is designated as a cleaning station on the outer perimeter of turntable 1. The following cleaning components are installed at this station:

[0061] High-pressure air source: The high-pressure air pipe 6 is fixed on the frame, and its inlet end is connected to an external high-pressure air pump to provide a dry and clean high-pressure air source.

[0062] Air purification: A filter 7 is fixedly connected to the end of the high-pressure air pipe 6. The filter 7 is equipped with a precision filter screen (preferably made of stainless steel) to remove impurities such as oil stains, dust and moisture that may be contained in the high-pressure air, ensuring that the blown air is absolutely clean and avoiding secondary contamination of the mold or medicine.

[0063] Air path control: An electrically controlled valve 8 is fixedly connected to the bottom of the filter 7. The electrically controlled valve 8 is precisely controlled by the tablet press's control system and is responsible for opening or closing the air path to the cleaning head as needed.

[0064] Flow guidance and shaping: The output end of the electronically controlled valve 8 is fixedly connected to a cleaning pipe 9. The cleaning pipe 9 is designed with a 90-degree bend (such as an L-shape) so that its air outlet can be precisely located and oriented directly below the tableting tank 5 that rises to the cleaning station.

[0065] High-efficiency cleaning nozzle: A specially designed nozzle 10 is fixedly connected to the end of the cleaning tube 9. The most distinctive feature of this nozzle 10 is its upward-facing (i.e., aligned with the pressure groove 5 passing above) nozzle design. A fine air outlet is formed at the inner edge of the nozzle 10. This structural design allows the nozzle 10 to spray an upward-facing, concentrated, and very dry high-pressure clean airflow, forming an inverted airflow "curtain".

[0066] The working principle of this utility model is as follows:

[0067] Rotation and tableting cycle: The drive motor drives the turntable 1 to rotate at high speed. The punch 4 (lower punch), which is fixedly installed in the middle mold 2, rotates with the turntable 1. The pressure roller in the tablet press contacts the top of the punch 4, and the punch is pressed into the middle mold by mechanical force to generate the pressure required for tableting.

[0068] Quantitative feeding: When the intermediate mold 2 equipped with the quantitative feeding valve 3 rotates with the turntable to the feeding station (usually located before the cleaning station), the control system precisely controls the operation of the quantitative feeding valve 3 at this station according to the specifications of the tablets currently being produced. The rotating blades inside the quantitative feeding valve 3 rotate at a set speed and angle, injecting precisely measured powder into the cavity of the intermediate mold 2 below through its outlet (at this time, the lower punch has descended to the filling position).

[0069] Tableting: After the material is fed, the middle die 2 rotates with the turntable and enters the pre-compression and main compression station. Under the joint extrusion of the upper punch (located directly above the middle die 2 and controlled by a fixed track) and the lower punch 4, the powder in the cavity of the middle die 2 is compressed into tablets of the specified shape and hardness.

[0070] Tablet ejection: The compressed tablets are ejected from the top of the middle mold 2 by the lifting action of the lower punch 4 (tablet ejection station).

[0071] Tableting chamber cleaning: After the tablet ejection action is completed, the middle mold 2 and its corresponding punch 4 (lower punch) continue to rotate with the turntable 1 to the set cleaning position.

[0072] Position triggering: When the punch 4 is fully raised and precisely moved to the cleaning station, its bottom tablet pressing groove 5 is directly above the nozzle 10. The inner diameter of the tablet pressing groove 5 is designed to be larger than the maximum diameter (or coverage area) of the nozzle 10 to ensure that the airflow can enter the groove without obstruction.

[0073] High-pressure purging: The control system precisely controls the instantaneous opening of the electrically controlled valve 8 (the opening duration can be set according to the residue situation). High-pressure clean air flows sequentially through the high-pressure air pipe 6, the filter 7 (for thorough purification), the electrically controlled valve 8, and the cleaning pipe 9 with a 90-degree bend, finally reaching the nozzle 10.

[0074] Annular airflow cleaning: An annular, dry, and clean high-pressure airflow is ejected from the air outlet along the inner edge of the nozzle 10, powerfully and evenly impacting and covering the entire concave surface of the tableting groove 5 from bottom to top. This high-speed airflow can effectively peel off, roll up, and blow out all the fine powder residues that adhere to the groove wall during the tableting process.

[0075] Drying and preparation: The high-pressure airflow not only removes residues, but its drying properties also remove trace amounts of moisture, ensuring that the tableting tank 5 is clean and dry when it enters the next feeding cycle.

[0076] Cyclic Repetition: Turntable 1 rotates continuously. The station that has completed cleaning enters the next feeding cycle, while the intermediate mold 2 and punch 4 of the subsequent stations undergo the same feeding, pressing, extrusion, and cleaning process in sequence. The electrically controlled valve 8 opens and closes frequently and precisely according to the turntable position signal.

[0077] Compared with the prior art, the present invention has the following advantages:

[0078] This high-speed rotary tablet press for pharmaceutical use features a quantitative feeding valve 3 designed along the powder output path. This valve automatically adjusts the required powder dosage for tableting according to the needs of different pharmaceutical manufacturing processes, facilitating rapid switching between tableting of different drugs. The valve precisely delivers powder by adjusting the rotational speed and spacing of the internal rotating blades. The minimal gap between the blades and the valve body prevents material leakage while ensuring stable flow.

[0079] A cleaning station is designed next to the turntable 1. When the tableting chamber 5 finishes pressing the tablets, rises and rotates, the high-pressure air pipe 6 is connected to the air pump to output high-pressure air. The air is filtered in the filter 7 to remove impurities inside the air, and then output through the cleaning pipe 9 and the nozzle 10. The nozzle 10 is specially designed to output a ring-shaped, dry high-pressure airflow from bottom to top to the inside of the tableting chamber 5, which can thoroughly clean and dry the residual powder inside the chamber. This can effectively prevent powder residue inside the tableting chamber 5, without affecting the dosage of subsequent tablets, and ensure the accuracy of drug dosage.

Claims

1. A pharmaceutical high-speed rotary tablet press characterized by comprising: It includes a turntable (1), which is divided into an inner rail (101) and an outer rail (102). Several intermediate molds (2) are fixedly connected to the inner side of the outer rail (102). The middle mold (2) has a built-in quantitative feeding valve (3), and the middle mold (2) is movably connected with a punch (4); The bottom end of the punch (4) is fixedly connected to a pressing groove (5); A high-pressure air pipe (6) is provided on the side of the turntable (1), and a filter (7) is fixedly connected to the end of the high-pressure air pipe (6); The bottom of the filter (7) is fixedly connected to an electric control valve (8), and the output end of the electric control valve (8) is fixedly connected to a cleaning pipe (9); The cleaning tube (9) is fixedly connected to an upward-facing nozzle (10), and the inner edge of the nozzle (10) is the air outlet.

2. A high speed rotary tablet press for pharmaceutical use as claimed in claim 1, wherein: The turntable (1) and the middle mold (2) are connected by screws, and the width of the inner rail (101) is greater than the width of the outer rail (102).

3. A high speed rotary tablet press for pharmaceutical use as claimed in claim 2 wherein: The quantitative feed valve (3) is specifically a rotary feed valve.

4. A high speed rotary tablet press for pharmaceutical use as claimed in claim 3 wherein: The punch (4) is made of stainless steel, and the inner diameter of the pressing groove (5) is larger than the diameter of the nozzle (10).

5. A high speed rotary tablet press for pharmaceutical use as claimed in claim 4 wherein: The filter (7) has a built-in stainless steel filter screen, and the cleaning tube (9) is bent at a ninety-degree angle.

6. A high speed rotary tablet press for pharmaceutical use as claimed in claim 5 wherein: The nozzle (10) sprays an annular high-pressure airflow upwards, and the station where the nozzle (10) is located is a cleaning station.

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