A plunger type dosing and filling mechanism

Abstract

The utility model discloses a plunger type ration filling mechanism belongs to filling machine field, a plunger type ration filling mechanism, including frame, be installed with cylinder body mounting bracket on the frame, be provided with a plurality of ration cylinders on cylinder body mounting bracket top, the ration cylinder includes plunger rod and the plunger cylinder that slides with plunger rod connection, the transmission assembly that drives plunger rod reciprocating linear motion is installed in the frame. Can realize the accurate, stable, efficient filling of liquid traditional chinese medicine, and can satisfy the demand of different medicine amount.

Description

Technical Field

[0001] This utility model relates to a plunger-type quantitative filling mechanism, belonging to the field of filling machines. Background Technology

[0002] Traditional Chinese medicine filling mechanisms are mainly used to accurately and stably fill liquid traditional Chinese medicine into medicine containers, meeting the automation and high precision requirements of traditional Chinese medicine pharmaceutical and related fields for liquid filling. Traditional quantitative filling methods have significant drawbacks. Early manual filling relied entirely on manual operation, which was not only extremely inefficient and unable to meet the demands of mass production, but also prone to dosage deviations due to the subjectivity and instability of manual operation. Traditional Chinese medicine prescriptions require extremely high dosage accuracy; even minor dosage errors can affect efficacy and even pose medical risks. Furthermore, manual operation is prone to contamination from contact with the medicinal liquid, affecting the hygiene and quality of the product. While semi-automatic liquid filling machines improve efficiency to some extent by employing a single-head plunger-type quantitative filling device that achieves quantitative material supply through adjusting the plunger's movement distance, they still have limitations in practical applications. When faced with multiple filling needs, they cannot guarantee synchronous and precise operation of each filling head. Dosage differences often exist between different filling heads or between different batches of the same filling head, making it difficult to meet the requirements for product uniformity in large-scale production. Furthermore, the process of adjusting the filling volume is cumbersome and lacks flexibility, making them poorly suited for traditional Chinese medicine filling scenarios that require frequent changes in formulation and dosage. These problems make it difficult for existing filling methods to fully meet the needs of accurate, stable, and efficient filling of liquid traditional Chinese medicine. Therefore, a new type of filling mechanism is urgently needed to solve the above-mentioned defects. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a plunger-type quantitative filling mechanism that can achieve accurate, stable and efficient filling of liquid Chinese medicine and can meet the needs of different dosages.

[0004] The technical solution adopted by this utility model to solve its existing problems is: A plunger-type quantitative filling mechanism includes a frame, on which a cylinder mounting bracket is mounted. Multiple quantitative cylinders are provided on the top of the cylinder mounting bracket. Each quantitative cylinder includes a plunger rod and a plunger cylinder body that is slidably connected to the plunger rod. The frame is equipped with a transmission assembly that drives the plunger rod to reciprocate linearly.

[0005] Preferably, the frame has a through groove, and the cylinder mounting bracket is fixedly installed on the top of the frame, with the cylinder mounting bracket located above the through groove; the cylinder mounting bracket has multiple through holes adapted to the plunger rod, and the plunger rod extends into the frame through the through holes and the through groove.

[0006] Preferably, a plurality of guide posts are fixedly installed below the cylinder mounting bracket, and a first mounting plate is fixedly installed at the bottom of the guide posts, and the transmission assembly is installed on the first mounting plate.

[0007] Preferably, the transmission assembly includes a motor, the output end of which is connected to a ball screw, the motor is fixedly connected to a first mounting plate, the ball screw is rotatably connected to the first mounting plate, and the top of the ball screw is rotatably connected to a cylinder mounting bracket.

[0008] Preferably, a ball nut is installed in the middle of the ball screw, a second mounting plate is fixedly installed on the ball nut, and a plurality of linear sliding parts that are slidably connected to the guide post are fixedly installed on the second mounting plate; the plunger rod is fixedly connected to the second mounting plate.

[0009] Preferably, a pneumatic three-way valve is installed on the top of the plunger cylinder. The pneumatic three-way valve includes a dispensing port and an injection port. The dispensing port is connected to a liquid medicine tank, and the injection port is connected to a medicine container.

[0010] Preferably, the bottom of the frame is equipped with multiple feet to support the entire device.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Precise Dosing, Adapting to Diverse Needs: Utilizing a servo motor-driven transmission system that operates the ball screw and ball nut, the movement distance of the plunger rod within the dosing cylinder can be precisely adjusted. This precise adjustment function allows the equipment to easily and flexibly adapt to various dosage requirements. Whether it's filling extremely small or large doses of traditional Chinese medicine, the precise control of the dispensing amount can be achieved by accurately adjusting the motor drive distance, effectively avoiding dosage errors that may occur with manual dispensing. This greatly improves the accuracy of traditional Chinese medicine prescriptions and the stability of product quality. The servo motor is directly connected to the ball screw via a coupling, enabling precise control of the ball screw's rotation angle, thereby precisely adjusting the plunger rod's movement distance. This results in faster response speed, better synchronization, and no energy loss from intermediate transmission links. 2. Multi-cylinder synchronization for high-efficiency operation: The plunger rods of multiple metering cylinders are tightly linked through a second mounting plate and driven by the same transmission system. This design ensures that all metering cylinders can start and stop completely synchronously during drug dispensing and injection, and maintain the same stroke. This means that the equipment can simultaneously complete the quantitative extraction and injection of multiple sets of medicines. Compared with traditional single-cylinder or asynchronous multi-cylinder filling equipment, it significantly improves the efficiency of batch pharmaceutical production, and is particularly suitable for scenarios such as traditional Chinese medicine pharmacies and pharmaceutical factories that require large-scale and efficient production. 3. High consistency, ensuring stable efficacy: Due to the extremely high synchronization precision of the multi-cylinder system, the amount of medicine dispensed and the injection speed of each set of quantitative cylinders are completely consistent, effectively avoiding dosage deviations that may be caused by the independent operation of multiple actuators. In the production of traditional Chinese medicine, it is crucial to ensure that the composition ratio and amount of medicine in each filling container are strictly uniform. The high-precision synchronization performance of this equipment ensures that the dosage of the medicine in each filling container is accurate, thereby strongly guaranteeing the stable efficacy of the medicine, reducing the medical risks caused by uneven dosage, and providing reliable protection for the safety of patients' medication. 4. Multiple injections to flexibly meet needs: Without changing the size of the plunger cylinder, the equipment can also inject traditional Chinese medicine into the filling container multiple times according to actual needs. This flexible injection method can meet some special formulation requirements or customer needs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a plunger-type quantitative filling mechanism according to the present invention; Figure 2 This is a partial cross-sectional main view of a plunger-type quantitative filling mechanism according to the present invention; Figure 3 This is a partially enlarged schematic diagram of point A in a partial cross-sectional main view of a plunger-type quantitative filling mechanism of this utility model; Figure 4 This is a partially enlarged schematic diagram of point B in a partial cross-sectional main view of a plunger-type quantitative filling mechanism of this utility model; Figure 5 This is a side view schematic diagram of a plunger-type quantitative filling mechanism according to the present invention; Figure 6 This utility model relates to a plunger-type quantitative filling mechanism. Figure 5 A magnified view of a portion of point C in the middle.

[0013] In the picture: 1. Frame; 101. Through slot; 2. Transmission assembly; 201. Ball screw; 20101. Stepped shaft; 202. Ball nut; 203. First spacer; 204. Fixing sleeve; 205. Bearing mounting sleeve; 206. Rolling bearing; 207. Second spacer; 208. Locking nut; 209. Coupling; 2010. Motor; 2011. Motor bracket; 3. Foot; 4. First mounting plate; 5. Guide column; 6. Second mounting plate; 7. Linear sliding component; 8. 1. Cylinder mounting bracket; 801. Through hole; 9. Metering cylinder; 901. Piston rod; 902. Piston cylinder base; 903. Sliding sleeve; 904. Piston; 905. Piston cylinder body; 10. Pneumatic three-way valve; 1001. Drug dispensing port; 1002. Drug injection port; 1003. Conical port; 1004. Connecting hole; 1005. Exhaust plug mounting hole; 11. Pressure sensor; 12. Exhaust assembly; 1201. Exhaust plug; 1202. Return spring; 1203. Conical plug. Detailed Implementation

[0014] This specification and claims do not distinguish components by differences in name, but by differences in function. In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," and "horizontal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this 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. In this utility model, unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," and "fixed," etc., should be interpreted broadly. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0015] like Figures 1-5The illustrated plunger-type quantitative filling mechanism includes a frame 1 with a through slot 101. A cylinder mounting bracket 8 is fixedly mounted on the frame 1, positioned above the through slot 101. Multiple quantitative cylinders 9 are mounted on the top of the cylinder mounting bracket 8. Each quantitative cylinder 9 includes a plunger rod 901 and a plunger cylinder body 905. The plunger rod 901 includes a piston 904 mounted on its top, and the plunger rod 901 is slidably connected to the plunger cylinder body 905 via the piston 904. The lower part of the plunger cylinder body 905 includes a piston cylinder base 902 fixedly connected to the cylinder mounting bracket 8. A sliding sleeve 903, made of copper and highly wear-resistant, is fitted inside the piston cylinder base 902 and fixedly connected to the cylinder mounting bracket 8. The plunger rod 901 is slidably connected to the sliding sleeve 903. The top of the plunger cylinder 905 is equipped with a pneumatic three-way valve 10. The pneumatic three-way valve 10 includes a medicine dispensing port 1001 and a medicine injection port 1002. The medicine dispensing port 1001 is connected to a liquid Chinese medicine barrel, and the medicine injection port 1002 is connected to a medicine filling container. The medicine filling container can be a Chinese medicine bag. The connection between the medicine dispensing port 1001 and the liquid Chinese medicine barrel and the connection between the medicine injection port 1002 and the medicine filling container can be made by using a hose or other suitable method.

[0016] The pneumatic three-way valve 10 is a mature existing technology. The pneumatic three-way valve 10 mainly includes a pneumatic actuator and a valve core. It is a valve driven by compressed air. It drives the valve core to rotate or move through the pneumatic actuator, changing the relative position of the valve core and the valve seat, thereby switching the flow path of the medium.

[0017] The cylinder mounting bracket 8 has multiple through holes 801 that are adapted to the plunger rod 901. The diameter of the through holes 801 is larger than the diameter of the plunger rod 901. The plunger rod 901 passes through the through holes 801 and the through groove 101 and extends into the machine frame 1.

[0018] Multiple guide posts 5 are fixedly installed below the cylinder mounting bracket 8. The guide posts 5 pass through the through groove 101 and extend into the machine frame 1. A first mounting plate 4 is fixedly installed at the bottom of the guide posts 5, and the transmission assembly 2 is installed on the first mounting plate 4.

[0019] The frame 1 is equipped with a transmission assembly 2 that drives the plunger rod 901 to reciprocate linearly.

[0020] The transmission assembly 2 includes a motor 2010, which is a servo motor. A motor bracket 2011 is fixed to the motor 2010, and the motor 2010 is fixedly connected to the first mounting plate 4 through the motor bracket 2011. The output end of the motor 2010 is connected to a ball screw 201, which is rotatably connected to the first mounting plate 4. The top of the ball screw 201 is rotatably connected to the cylinder mounting bracket 8. To limit the axial displacement of the ball screw 201 and prevent it from falling off, a bearing mounting sleeve 205 is installed between the ball screw 201 and the first mounting plate 4. The bearing mounting sleeve 205 is fixedly connected to the first mounting plate 4, and a rolling bearing 206 is installed inside the bearing mounting sleeve 205. To limit the axial displacement of the rolling bearing 206, a fixing sleeve 204 is installed on the top of the bearing mounting sleeve 205. The ball screw 201 has a stepped shaft 20101 at its bottom. A fixed sleeve 204 and a rolling bearing 206 are fitted onto the stepped shaft 20101. The upper and lower ends of the rolling bearing 206 abut against a first spacer 203 and a second spacer 207, which are also fitted onto the ball screw 201. The stepped end face of the stepped shaft 20101 abuts against the upper end face of the first spacer 203. The end of the stepped shaft 20101 has a threaded section, and a locking nut 208 is installed on the threaded section. The upper end face of the locking nut 208 abuts against the lower end face of the second spacer 207. To ensure output stability, a coupling 209 is provided between the motor 2010 and the ball screw 201. A ball nut 202 is installed in the middle of the ball screw 201. A second mounting plate 6 is fixedly installed on the ball nut 202. A plurality of linear sliding parts 7 that are slidably connected to the guide post 5 are fixedly installed on the second mounting plate 6. The linear sliding parts 7 are linear bearings.

[0021] The motor 2010 drives the ball screw 201 to rotate, which in turn drives the ball nut 202 to move up and down on the ball screw 201. The ball nut 202 then drives the second mounting plate 6 to move up and down, which in turn drives the plunger rod 901 of the metering cylinder 9 to move up and down within the plunger cylinder body 905. This allows the liquid Chinese medicine to be taken from the medicine barrel and injected into the medicine container. By changing the distance that the motor 2010 drives the ball nut 202 to move up and down on the ball screw 201, the size of the cavity within the plunger cylinder body 905 can be changed, thereby changing the amount of medicine taken by the metering cylinder 9. This allows it to be used to meet different dosage requirements. This design utilizes the transmission of the ball screw 201 and ball nut 202 driven by the motor 2010 to precisely adjust the movement distance of the plunger rod 901 of the metering cylinder 9 within the plunger cylinder body 905. This allows for flexible changes in the amount of medicine dispensed, easily adapting to different dosage requirements. Simultaneously, the plunger rods 901 of multiple metering cylinders 9 are linked through the second mounting plate 6 and driven by the same transmission system, ensuring that they complete the dispensing and injection actions synchronously and with the same precision. If the size of the plunger cylinder body 905 is not desired, multiple doses of traditional Chinese medicine can be injected into the medicine container as needed. This not only ensures accurate and consistent dosage in each medicine container and guarantees stable efficacy, but also flexibly meets different injection requirements, simultaneously processing multiple doses of medicine, effectively improving operational efficiency and reducing errors and contamination that may arise from manual operation.

[0022] To avoid interference between the first mounting plate 4 and the second mounting plate 6 and the frame 1 during the reciprocating motion of the plunger, the length and width of the first mounting plate 4 and the second mounting plate 6 are both smaller than the length and width of the through groove 101. The plunger rod 901 is fixedly connected to the second mounting plate 6.

[0023] The frame 1 is equipped with multiple feet 3 at its bottom, which support the entire device. A plunger-type quantitative filling mechanism also includes a control system, which is a PLC control system. The pneumatic three-way valve 10, pressure sensor 11, and motor 2010 are all electrically connected to the control system.

[0024] During medication dispensing, the cylinder volume increases as the plunger rod 901 moves. Under normal circumstances, the liquid is incompressible, and a stable negative pressure forms inside the cylinder. When air bubbles enter the cylinder, their compressibility causes them to expand as the volume increases, filling part of the space and weakening the negative pressure formation. This results in the cylinder pressure being higher than normal, causing an abnormal pressure. To ensure the stability of the dispensing dosage, a pressure sensor 11 and an exhaust assembly 12 are also installed on the pneumatic three-way valve 10. The exhaust assembly 12 is used to automatically remove air bubbles from the liquid during dispensing, maintaining dosage accuracy. The pressure sensor 11 is connected to the cylinder and is used to sense the pressure inside the metering cylinder 9. When the pressure inside the metering cylinder 9 fluctuates, it sends a signal to the system to initiate an exhaust action. The pneumatic three-way valve 10 also includes a placement hole for installing the exhaust assembly 12. The placement hole is connected to the metering cylinder 9 and includes a conical orifice 1003, a connecting hole 1004, and an exhaust plug mounting hole 1005 connected in sequence. The exhaust assembly 12 includes an exhaust plug 1201, a return spring 1202, and a conical plug 1203. The return spring 1202 is located between the exhaust plug 1201 and the conical plug 1203. The exhaust plug 1201 is installed in the exhaust plug mounting hole 1005, and the return spring 1202 is located in the connection hole 1004. The conical plug 1203 is installed in the conical opening 1003, and the shape of the conical plug 1203 is adapted to the conical opening 1003. One end of the return spring 1202 is fixedly connected to the conical plug 1203, and the other end of the return spring 1202 abuts against the end face of the connection hole 1004 near the exhaust plug 1201. The exhaust plug 1201 is made of a material that allows gas to pass through but not liquid, such as polytetrafluoroethylene (PTFE). During the drug extraction stage, if air bubbles are introduced into the cylinder when the plunger rod 901 descends to extract the drug, the pressure inside the cylinder will fluctuate. The pressure sensor 11 detects the pressure change, and the control system controls the motor 2010 to stop descending. At the same time, the pneumatic three-way valve 10 stops communicating with the drug extraction port, driving the plunger rod 901 to move slightly upward. The pressure inside the cylinder increases, and the increased pressure forces the conical plug 1203 to move to the right. At this time, the cylinder communicates with the placement hole, and the gas is discharged through the conical port 1003, the connecting hole 1004, and the exhaust plug 1201. The air bubbles disappear, the pressure inside the cylinder returns to normal, and the conical plug 1203 is reset by the return spring 1202, blocking the placement hole again. The pressure sensor 11 sends a signal to the control system, and the pneumatic three-way valve 10 communicates with the drug extraction port, allowing the plunger rod 901 to continue descending to extract the drug.

[0025] The working process of the plunger-type quantitative filling mechanism is as follows: When a specific amount of medicine needs to be dispensed from the liquid medicine container, the pneumatic three-way valve 10 is activated, connecting the metering cylinder 9 to the dispensing port 1001. The motor 2010 drives the ball screw 201 to rotate, which in turn drives the ball nut 202 to move upward. The ball nut 202 then drives the second mounting plate 6 to move upward, which in turn drives the plunger rod 901 to move upward. When the plunger rod 901 reaches the preset position, the motor 2010 drives the ball screw 201 to rotate in the opposite direction, causing the ball screw 201 to move downward. The ball nut 202 then drives the second mounting plate 6 to move downward, which in turn drives the plunger rod 901 to move downward. The metering cylinder 9 then completes the dispensing process. When it is necessary to inject medicine from the metering cylinder 9 into the medicine container, the pneumatic three-way valve 10 is activated, the metering cylinder 9 is connected to the injection port 1002, the motor 2010 drives the ball screw 201 to rotate, the ball screw 201 drives the ball nut 202 to move upward, the ball nut 202 drives the second mounting plate 6 to move upward, the second mounting plate 6 drives the plunger rod 901 to move upward, and the liquid Chinese medicine in the metering cylinder 9 is injected into the medicine container.

[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A plunger-type quantitative filling mechanism, characterized in that: Includes a frame (1), on which a cylinder mounting bracket (8) is installed. The top of the cylinder mounting bracket (8) is provided with multiple sets of metering cylinders (9). The metering cylinder (9) includes a plunger rod (901) and a plunger cylinder body (905) that is slidably connected to the plunger rod (901). The frame (1) is equipped with a transmission assembly (2) that drives the plunger rod (901) to reciprocate linearly.

2. The plunger-type quantitative filling mechanism according to claim 1, characterized in that: The frame (1) has a through groove (101), and the cylinder mounting bracket (8) is fixedly installed on the top of the frame (1). The cylinder mounting bracket (8) is located above the through groove (101). The cylinder mounting bracket (8) has multiple through holes (801) adapted to the plunger rod (901). The plunger rod (901) passes through the through holes (801) and the through groove (101) and extends into the interior of the frame (1).

3. The plunger-type quantitative filling mechanism according to claim 2, characterized in that: Multiple guide posts (5) are fixedly installed below the cylinder mounting bracket (8), and a first mounting plate (4) is fixedly installed at the bottom of the guide posts (5). The transmission assembly (2) is installed on the first mounting plate (4).

4. The plunger-type quantitative filling mechanism according to claim 3, characterized in that: The transmission assembly (2) includes a motor (2010), the output end of the motor (2010) is connected to a ball screw (201), the motor (2010) is fixedly connected to the first mounting plate (4), the ball screw (201) is rotatably connected to the first mounting plate (4), and the top of the ball screw (201) is rotatably connected to the cylinder mounting bracket (8).

5. The plunger-type quantitative filling mechanism according to claim 4, characterized in that: A ball nut (202) is installed in the middle of the ball screw (201), and a second mounting plate (6) is fixedly installed on the ball nut (202). Multiple linear sliding parts (7) that are slidably connected to the guide post (5) are fixedly installed on the second mounting plate (6); the plunger rod (901) is fixedly connected to the second mounting plate (6).

6. The plunger-type quantitative filling mechanism according to claim 1, characterized in that: The top of the plunger cylinder (905) is equipped with a pneumatic three-way valve (10). The pneumatic three-way valve (10) includes a medicine dispensing port (1001) and a medicine injection port (1002). The medicine dispensing port (1001) is connected to a liquid Chinese medicine barrel, and the medicine injection port (1002) is connected to a medicine container.

7. The plunger-type quantitative filling mechanism according to claim 1, characterized in that: The frame (1) is equipped with multiple feet (3) at the bottom, which are used to support the entire device.

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