A kind of anti-blocking tablet outlet device for new drug small test tablet press

Abstract

The utility model relates to a kind of anti-blocking tablet outlet device for new drug pilot-plant tablet press, from bottom to top include negative pressure doctor blade assembly and negative pressure venturi tube assembly in sequence, and negative pressure doctor blade assembly and negative pressure venturi tube assembly are detachably connected together by fixed connecting piece;Negative pressure doctor blade assembly includes doctor blade mounting bracket and the doctor blade located at the front end of doctor blade mounting bracket;Negative pressure venturi tube assembly includes U-shaped pipe, gas interface and vacuum interface are respectively arranged in the rear end of U-shaped pipe, and the U-shaped pipe connecting portion in the middle of the front end of U-shaped pipe is connected together with the doctor blade connecting portion below and located at the top of doctor blade by fixed connecting piece.The soft doctor blade tip of the utility model is gently contacted with tablet, cooperates with normal distribution vacuum suction field, jointly acts to avoid stress concentration, effectively prevents the crack and edge drop of fragile tablet of small test.

Description

Technical Field

[0001] This utility model relates to the field of pharmaceutical equipment technology, and in particular to an anti-clogging tablet dispenser for a small-scale new drug tablet press. Background Technology

[0002] The development of tablet dispensers for tablet presses has progressed from early fixed metal scrapers that easily scratched tablets and wore out quickly, to the use of wear-resistant polymer or stainless steel composite materials with adjustable structures and added cushioning to reduce the stress on tablets, and then to quick-release and easy-to-clean designs that meet GMP requirements and surface coating treatments to reduce tablet sticking and powder carryover. In recent years, they have gradually developed towards intelligentization, using photoelectric or visual detection to monitor tablet drop, modular design for quick replacement, and linkage with automated conveying and packaging to improve production efficiency. The future focus will be on intelligent monitoring, material improvement, and modular rapid switching.

[0003] In the tableting process for new drugs in small-scale trials, tablets, being in the early stages of development, generally have low physical strength and are prone to breakage or deformation during compression and dispensing. Existing tableting machines often employ high suction pressure to ensure smooth tablet demolding, but excessive suction not only exacerbates mechanical damage but can also cause indentations or cracks on the tablet surface, affecting the appearance quality and subsequent testing. Furthermore, due to the fine particle size and dust generation of the drug powder, the vacuum dispensing system of existing equipment is highly susceptible to pipe blockage during long-term operation, impacting production efficiency and requiring frequent shutdowns for cleaning, increasing maintenance costs. In addition, traditional anti-clogging dispensing devices have complex designs, numerous components, and cumbersome assembly processes, requiring highly skilled operators and hindering rapid deployment and replacement in laboratory settings, thus limiting flexible prototyping and rapid iteration in new drug development.

[0004] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create an anti-clogging tablet dispenser for small-scale drug tableting machines, making it more valuable for industrial applications. Utility Model Content

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an anti-clogging tablet dispenser for a new drug small-scale tableting machine.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An anti-clogging tablet dispenser for a small-scale drug testing tablet press includes, from bottom to top, a negative pressure scraper assembly and a negative pressure venturi assembly, which are detachably connected together by a fixing connector. The negative pressure scraper assembly includes a scraper mounting bracket and a scraper located at the front end of the scraper mounting bracket; The negative pressure venturi tube assembly includes a U-shaped tube, with an air supply interface and a vacuum interface respectively provided on both sides of the rear end of the U-shaped tube. The U-shaped tube connection part in the middle of the front end of the U-shaped tube is connected to the scraper connection part below and located at the top of the scraper by a fixing connector. The tip of the scraper is a soft structure, and the lower edge of the scraper tip is aligned with the upper edge of the medicine. An arc-shaped vacuum section is provided at the scraper below the scraper connection.

[0007] As a further improvement of this utility model, the tip of the scraper is made of polyurethane or silicone.

[0008] As a further improvement of this utility model, the vacuum section has an arc-shaped structure with a high center and low sides, so that the vacuum suction force inside it is normally distributed with a high center and low sides.

[0009] As a further improvement of this utility model, a sealed narrow strip structure is provided on one side of the vacuum section.

[0010] As a further improvement of this utility model, the U-shaped tube connecting part, the fixed connecting part and the scraper connecting part are installed together by means of threads.

[0011] As a further improvement of this utility model, sealing rings are installed at the connection points between the U-shaped tube connection and the fixed connector, and between the fixed connector and the scraper connection.

[0012] As a further improvement of this utility model, an anti-stick coating is applied to the inner wall of the channel of the U-shaped tube gas supply interface, the vacuum interface, and the U-shaped tube connection.

[0013] As a further improvement of this utility model, the anti-stick coating is a polytetrafluoroethylene coating or an oxygen resin-based coating.

[0014] By means of the above solution, this utility model has at least the following advantages: The soft scraper tip of this invention makes gentle contact with the tablet, and together with the normally distributed vacuum suction field, they work together to avoid stress concentration and effectively prevent the fragile tablets from cracking and falling off.

[0015] The negative pressure venturi tube assembly of this invention provides a stable negative pressure source. Combined with the sealed narrow strip structure on one side of the vacuum section, it can remove dust as much as possible and prevent it from accumulating in the channel.

[0016] The negative pressure scraper assembly and negative pressure venturi assembly of this utility model have good detachability, which facilitates the installation, disassembly and maintenance of the components.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the following are the preferred embodiments of this utility model and are described in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an anti-clogging tablet dispenser for a small-scale drug testing tablet press according to this utility model; Figure 2 yes Figure 1 Exploded view; Figure 3 yes Figure 1 Schematic diagram of the structure of the medium and negative pressure scraper assembly; Figure 4 yes Figure 1 A schematic diagram of the structure of a medium- and negative pressure venturi tube assembly.

[0020] The meanings of the labels in the figures are as follows.

[0021] Negative pressure scraper assembly 1; fixed connector 2; negative pressure venturi tube assembly 3; Scraper mounting bracket 11, scraper 12, scraper connecting part 13; 21. U-shaped tube, 22. Gas supply interface, 23. Vacuum interface, 24. U-shaped tube connector. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] The first embodiment of this utility model: like Figures 1-4 As shown in the figure, an anti-clogging tablet dispenser for a small-scale drug trial tablet press in this embodiment mainly includes a negative pressure scraper assembly 1, a fixed connector 2, and a negative pressure venturi tube assembly 3. The negative pressure scraper assembly 1 and the negative pressure venturi tube assembly 3 are detachably connected together by the fixed connector 2.

[0025] The negative pressure scraper assembly 1 includes a scraper mounting bracket 11 and a scraper 12 located at the front end of the scraper mounting bracket 11. The tip of the scraper 12 is made of a soft material such as polyurethane or silicone. The lower edge of the tip of the scraper 12 is aligned with the upper edge of the medicine, and sliding push is used instead of scraping, which greatly reduces mechanical damage.

[0026] The top of the scraper has a scraper connection part, below which an arc-shaped vacuum section is formed. This vacuum section is designed with a high middle and low sides, so that the internal vacuum suction is normally distributed, minimizing the impact of vacuum suction on the tablets, but not affecting the dust removal effect. It focuses on adsorbing dust rather than tablets.

[0027] A sealed narrow strip structure is also provided on one side of the vacuum section to force the residual dust to be removed and improve the dust removal effect.

[0028] The negative pressure venturi tube assembly 3 includes a U-shaped tube 21. An air supply port 22 and a vacuum port 23 are respectively provided on both sides of the rear end of the U-shaped tube 21. The U-shaped tube connecting part 24 at the middle of the front end of the U-shaped tube 21 is connected to the scraper connecting part 13 below and located on top of the scraper 12 through a fixing connector 2.

[0029] The high-speed gas in the venturi tube can generate suction. The gas flows in and out, which can quickly remove powder and blow away foreign objects that are clogging the pipe.

[0030] The U-shaped tube connector 24, the fixed connector 2, and the scraper connector 13 are preferably connected by threads, and a sealing ring is installed at the interface to ensure airtightness.

[0031] The second embodiment of this utility model: First, fix the negative pressure scraper assembly 1 to the designated position on the tablet press turntable using the scraper mounting bracket 11. Then, screw the fixing connector 2 into the scraper connection part 13. Finally, align the U-shaped tube connection part 24 of the negative pressure venturi assembly 3 with the upper end of the fixing connector 2 and tighten the connection. Sealing rings are installed at the connections between the U-shaped tube connection part 24 and the fixing connector 2, and between the fixing connector 2 and the scraper connection part 13, to ensure that the sealing rings at each connection are pressurized and sealed.

[0032] The working process of this embodiment: Connect the compressed air pipe to the air supply port 22 and the vacuum pipe to the vacuum port 23. Initially, adjust the air source pressure to a low level (e.g., 0.2 MPa).

[0033] Start the tablet press at low speed and fine-tune the position of the negative pressure scraper assembly 1 so that the lower edge of the soft tip of the scraper 12 is just aligned (tangent) with the upper surface of the tablet after compression.

[0034] Adjust the gas source pressure to the normal operating pressure (e.g., 0.4-0.6 MPa).

[0035] The tablet press turntable rotates the tablets to the dispensing station. A soft scraper gently pushes the tablets out of the die orifice and slides them along the scraper's curved surface into the vacuum section. At this point, the negative pressure suction generated by the venturi tube is transmitted to the vacuum section through the scraper connection. Because the vacuum section has an arc-shaped structure that is higher in the middle and lower on both sides, the resulting suction field exhibits a normal distribution, with a strong center and weak sides. This optimized force field efficiently removes loose dust from the tablet surface, while the uniform suction avoids tensile stress damage to the tablets caused by excessive localized adsorption. The cleaned tablets, propelled by subsequent tablets, smoothly enter the downstream collection device.

[0036] The third embodiment of this utility model: During long-term operation of the first embodiment described above, extremely fine dust particles may fail to be completely captured by the main suction field and adhere to the vicinity of the channel wall.

[0037] At this point, the narrow, sealed structure on one side of the vacuum section begins to play a crucial role. This narrow structure creates a region with a suddenly reduced cross-section. According to fluid dynamics principles, the airflow velocity increases dramatically here, forming a highly efficient air blade. This air blade effectively scrapes off residual dust adhering to the wall surface and forces it into the negative pressure airflow, where it is drawn into the Venturi tube, thus preventing dust from gradually accumulating in dead corners and causing blockages.

[0038] Meanwhile, the anti-stick coating (PTFE or epoxy resin-based) inside the U-shaped tube ensures that dust is difficult to adhere to the tube wall. Even if there is slight adhesion, it is easily washed away by the high-speed airflow, further ensuring the long-term smooth flow of the channel.

[0039] The fourth embodiment of this utility model: Cleaning is required when a batch of tablets is completed or when a product type needs to be changed. The maintenance process for this invention is very simple: Turn off the gas supply and vacuum.

[0040] The negative pressure venturi tube assembly 3 can be removed from the fixed connector 2 by manually unscrewing it.

[0041] Similarly, the fixing connector 2 can be unscrewed to fully expose the negative pressure scraper assembly 1.

[0042] Thanks to threaded connections and an anti-stick coating, virtually no dust adheres to the interior of each component. Operators can clean simply by blowing with compressed air or gently wiping with a soft cloth, without the need for complex disassembly using tools. After cleaning, assembly can be quickly completed and production resumed by following the assembly steps in the first and second embodiments. This quick-release structure design significantly reduces downtime for equipment maintenance and product changeovers, making it ideal for the frequent formula changes required during the R&D phase.

[0043] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 based on the specific circumstances.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A tablet ejector for a small-scale drug trial tableting machine, characterized in that: From bottom to top, it includes a negative pressure scraper assembly (1) and a negative pressure venturi tube assembly (3), which are detachably connected together by a fixing connector (2). The negative pressure scraper assembly (1) includes a scraper mounting bracket (11) and a scraper (12) located at the front end of the scraper mounting bracket (11). The negative pressure venturi tube assembly (3) includes a U-shaped tube (21), with an air supply interface (22) and a vacuum interface (23) respectively provided on both sides of the rear end of the U-shaped tube (21). The U-shaped tube connecting part (24) in the middle of the front end of the U-shaped tube (21) is connected to the scraper connecting part (13) below and located on the top of the scraper (12) by a fixing connector (2). The tip of the scraper (12) is a soft structure, and the lower edge of the tip of the scraper (12) is aligned with the upper edge of the medicine. An arc-shaped vacuum section is provided at the scraper (12) below the scraper connection part (13).

2. The anti-clogging tablet dispenser for a small-scale drug trial tableting machine as described in claim 1, characterized in that, The tip of the scraper (12) is made of polyurethane or silicone.

3. The anti-clogging tablet dispenser for a small-scale drug trial tableting machine as described in claim 1, characterized in that, The vacuum section has an arc-shaped structure that is high in the middle and low on both sides, so that the vacuum suction inside it is normally distributed with high in the middle and low on both sides.

4. The anti-clogging tablet dispenser for a small-scale drug trial tableting machine as described in claim 1, characterized in that, A sealed narrow strip structure is provided on one side of the vacuum section.

5. The anti-clogging tablet dispenser for a small-scale drug trial tableting machine as described in claim 1, characterized in that, The U-shaped tube connector (24), the fixed connector (2), and the scraper connector (13) are installed together by means of threads.

6. The anti-clogging tablet dispenser for a small-scale drug trial tableting machine as described in claim 5, characterized in that, Sealing rings are installed at the connection between the U-shaped tube connection (24) and the fixed connector (2), and between the fixed connector (2) and the scraper connection (13).

7. The anti-clogging tablet dispenser for a small-scale drug trial tableting machine as described in claim 1, characterized in that, The inner walls of the air supply port (22), vacuum port (23) and U-tube connection (24) of the U-tube (21) are all coated with an anti-stick coating.

8. The anti-clogging tablet dispenser for a small-scale drug trial tableting machine as described in claim 7, characterized in that, The anti-stick coating is a polytetrafluoroethylene coating or an oxygen resin-based coating.

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