A precision dosing device suitable for soft capsule production

Abstract

This invention provides a precision dispensing device suitable for soft capsule production, comprising a mixing tank and a metering tank connected to the mixing tank. The metering tank has a discharge port at the bottom and a feed port and an air inlet at the top. The air inlet is connected to a first air pump, which can input external gas into the metering tank. A sweeping mechanism is also provided inside the metering tank, comprising a guide shaft and a drive unit connected to the guide shaft. The drive unit can drive the guide shaft to slide along the height direction of the metering tank. One end of the guide shaft is connected to an outlet nozzle. This invention, by setting up a sweeping mechanism, utilizes the drive unit to drive the guide shaft with the outlet nozzle to slide along the height direction of the metering tank. As the outlet nozzle moves downward with the guide shaft, it can apply a dynamic, close-range airflow impact to the high-viscosity material adhering to the inner wall of the metering tank, using the local kinetic energy of the airflow to sever the adhesion interface between the material and the inner wall.

Description

Technical Field

[0001] This invention relates to the field of soft capsule production technology, specifically to a precision ingredient dispensing device suitable for soft capsule production. Background Technology

[0002] In industrial production processes such as chemical, food, pharmaceutical, and new energy, it is often necessary to discharge high-viscosity materials from storage tanks or reaction vessels. Currently, air-pressurized discharge technology has become the mainstream method for discharging materials from sealed metering tanks due to its significant advantages, including simple structure, no mechanical moving parts in contact with the material, effective avoidance of shear damage, and ease of achieving fully enclosed aseptic operation. Its basic principle is to inject high-pressure gas into the top of the metering tank, using a constant static air pressure thrust to force the material out from the discharge port at the bottom of the tank.

[0003] However, in practical industrial applications, this traditional top static air pressure discharge method reveals significant limitations when processing high-viscosity materials such as soft capsule gelatin. High-viscosity materials typically exhibit a strong tendency to adhere to the container walls and high yield stress, resulting in substantial adhesion and frictional resistance between the material and the inner wall of the metering tank. As the top static pressure gas pushes downwards, influenced by fluid dynamics, the airflow spontaneously seeks the discharge path of least resistance. Therefore, the high-pressure gas often bypasses the tank wall edges where resistance is extremely high, directly "piercing" the entire material layer from the weaker resistance area in the center of the tank and escaping instantly from the bottom discharge port. This phenomenon is known in engineering fluid mechanics as "pore penetration" or "rat hole effect." Once the "rat hole effect" occurs, the driving air pressure inside the metering tank leaks instantly, forcing the discharge process to stop. This results in a large amount of material remaining in the tank walls and bottom in a hollow tubular form, unable to be discharged. Consequently, the actual mass of discharged material is far lower than the planned feed rate, leading to severe proportioning errors and production mistakes in the production of soft capsules and other products with extremely high formulation requirements, making precise dispensing difficult. Summary of the Invention

[0004] The present invention aims to provide a precision dispensing device suitable for soft capsule production, so as to achieve precise dispensing of high-viscosity materials.

[0005] The present invention is as follows: A precision dispensing device suitable for soft capsule production includes a mixing tank and a metering tank connected to the mixing tank. The metering tank has a discharge port at the bottom and a feed port and an air inlet at the top. The air inlet is connected to a first air pump, which can input external gas into the metering tank. The metering tank is also equipped with a sweeping mechanism, which includes a guide shaft and a drive unit connected to the guide shaft. The drive unit can drive the guide shaft to slide along the height direction of the metering tank. One end of the guide shaft is connected to an outlet nozzle. The metering tank is equipped with a second air pump, the inlet of which is connected to the top of the metering tank. The guide shaft has a circulation channel inside that connects the outlet of the second air pump to the outlet nozzle.

[0006] Furthermore, the exhaust nozzle includes a first flow channel group and a second flow channel group; the exhaust nozzle is provided with a flow channel switching component; the flow channel switching component can selectively open the first flow channel group and block the second flow channel group, or block the first flow channel group and open the second flow channel group.

[0007] Furthermore, when the airflow generated by the second air pump flows through the first flow channel assembly, it forms an annular planar jet acting on the side wall of the metering tank. The first flow channel assembly includes a first annular flow gap opened circumferentially along the outlet nozzle; the jetting direction of the first annular flow gap is inclined downward and toward the inner side wall of the metering tank.

[0008] Furthermore, when the airflow generated by the second air pump flows through the second flow channel group, it forms an annular scattering flow toward the bottom of the metering tank; and inside the metering tank below the outlet nozzle, a pressure gradient field with a lower central wind pressure and a higher outer edge wind pressure is formed.

[0009] Furthermore, the second flow channel assembly includes a second inner annular flow gap and a second outer annular flow gap opened circumferentially along the outlet nozzle. The second inner annular flow gap and the second outer annular flow gap are coaxially arranged and their injection directions are both inclined downward and toward the bottom of the metering tank. The second outer annular flow gap has a first flow area, and the second inner annular flow gap has a second flow area. The first flow area is smaller than the second flow area.

[0010] Furthermore, the flow channel switching assembly includes a slidable blocking core block and an actuator drivenly connected to the blocking core block, wherein the blocking core block is provided with a first movable flow blocking part and a second movable flow blocking part.

[0011] Furthermore, the drive unit includes a power motor fixedly installed on the top of the metering tank, a lead screw and nut assembly driven by the power motor, and a lifting slide connected to the lead screw and nut assembly; the upper end of the air guide shaft extends out of the top of the metering tank and is fixedly connected to the lifting slide.

[0012] The beneficial effects of this invention are as follows: This invention employs a sweeping mechanism, utilizing a drive unit to propel a guide shaft with an exhaust nozzle along the height of the metering tank. As the exhaust nozzle moves with the guide shaft, it applies a dynamic airflow to sweep away the high-viscosity material adhering to the inner wall of the metering tank, effectively preventing the "mouse hole effect" caused by high-pressure gas directly penetrating the material layer from the center during discharge. This ensures smooth and complete material discharge, preventing quality errors between the actual discharge volume and the planned feed volume due to pressure leakage or discharge interruption, thus guaranteeing accurate batching.

[0013] This invention utilizes a first air pump to establish the basic back pressure for discharging, while simultaneously using a second air pump to extract gas from inside the metering tank. This gas is then guided to the outlet nozzle for purging via a circulation channel within the air guide shaft. This design provides airflow to the purging mechanism without introducing additional gas mass into the sealed system of the metering tank. This effectively maintains the stable basic static pressure required for discharging, avoiding the pressure fluctuations within the tank that are easily caused by traditional continuous aeration purging, thus ensuring a highly uniform flow velocity of the material at the discharge valve; further improving the accuracy of batching. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the jet flow when the airflow exits from the first flow channel group in one embodiment of the present invention; Figure 3 for Figure 2 Enlarged view of part A; Figure 4 This is a schematic diagram of the air guide shaft movement process in one embodiment of the present invention; Figure 5 This is a schematic diagram of the jet from the second flow channel group in one embodiment of the present invention; Figure 6 for Figure 5 Enlarged view of part B.

[0016] Explanation of reference numerals in the attached figures: 100. Metering tank; 110. Mixing tank; 101. Discharge port; 102. Feed inlet; 103. Air inlet; 120. First air pump; 130. Second air pump; 200. Sweeping mechanism; 210. Air guide shaft; 211. Circulation channel; 221. Power motor; 222. Lead screw and nut assembly; 223. Lifting slide; 300. Exhaust nozzle; 310. First annular flow gap; 320. Second flow channel assembly; 321. Second outer annular flow gap; 322. Second inner annular flow gap; 400, Flow channel switching assembly; 401, Blocking core block; 410, First movable flow blocking part; 420, Second movable flow blocking part; 430, Actuator. Detailed Implementation

[0017] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0018] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] As attached Figure 1-6 The device shown is a precision dispensing apparatus suitable for soft capsule production. It includes a mixing tank 110 and a metering tank 100 connected to the mixing tank 110. The metering tank 100 has a discharge port 101 at the bottom and a feed port 102 and an air inlet 103 at the top. The air inlet 103 is connected to a first air pump 120, which can input external gas into the metering tank 100. The metering tank 100 is also equipped with a sweeping mechanism 200, which includes a guide shaft 210 and a drive unit connected to the guide shaft 210. The drive unit can drive the guide shaft 210 to slide along the height direction of the metering tank 100. One end of the guide shaft 210 is connected to an outlet nozzle 300. The metering tank 100 is equipped with a second air pump 130. The air inlet of the second air pump 130 is connected to the top of the metering tank 100. The guide shaft 210 has a circulation channel 211 inside that connects the outlet of the second air pump 130 and the outlet nozzle 300.

[0020] Specifically, the mixing tank 110 and the metering tank 100 are connected by a closed pipeline with a mechanical conveying valve, which is used to transport the capsule base material in the metering tank 100 to the mixing tank 110.

[0021] Understandably, the first air pump 120 is used to draw air from the outside in one direction and increase the overall ambient air pressure inside the metering tank 100, thereby providing a basic and constant static pressure thrust for the downward discharge of high-viscosity materials. The air inlet of the second air pump 130 is connected to the sealed space at the top of the metering tank 100, and its outlet is discharged back into the metering tank 100 through the circulation channel 211. Therefore, when the second air pump 130 is running at high speed to provide sweeping airflow, no additional gas mass is introduced into the metering tank 100.

[0022] Furthermore, the exhaust nozzle 300 includes a first flow channel group and a second flow channel group 320; the exhaust nozzle 300 is provided with a flow channel switching component 400; the flow channel switching component 400 can selectively open the first flow channel group and block the second flow channel group 320, or block the first flow channel group and open the second flow channel group 320.

[0023] When the airflow generated by the second air pump 130 flows through the first flow channel group, it forms an annular planar jet acting on the side wall of the metering tank 100. The first flow channel group includes a first annular flow gap 310 opened circumferentially along the outlet nozzle 300; the jet direction of the first annular flow gap 310 is inclined downward and toward the inner side wall of the metering tank 100.

[0024] When the airflow generated by the second air pump 130 flows through the second flow channel group 320, it forms an annular scattering flow toward the bottom of the metering tank 100; and inside the metering tank 100 below the air outlet nozzle 300, a pressure gradient field is formed with a lower central wind pressure and a higher outer edge wind pressure.

[0025] Specifically, when the air guide shaft 210 slides downward along the height direction of the metering tank 100, the flow channel switching component 400 activates the first flow channel group, and the airflow is ejected from the first flow channel group, thereby performing high-pressure wall cutting and peeling of the high-viscosity material adhering to the inner wall of the metering tank 100. As the air guide shaft 210 moves downward, a dynamic wall cleaning operation from top to bottom is achieved.

[0026] Understandably, the air guide shaft 210 can move up and down repeatedly depending on the material adhesion to the wall, so that the material on the inner wall of the metering tank 100 is completely stripped off. In this reciprocating cleaning logic, when the air guide shaft 210 performs an upward reset stroke, the second air pump 130 is in a shut-off or depressurized shutdown state to cut off the air supply to the air outlet nozzle 300. This prevents the high-pressure airflow ejected by the air outlet nozzle 300 when it moves upward from blowing the already stripped and fallen high-viscosity material back upward, effectively preventing the material from "re-adhering to the wall".

[0027] As the air guide shaft 210 reciprocates, the material on the inner wall of the metering tank 100 gradually accumulates at its bottom, but still piles up in the area near the inner wall. If pressurization is applied at this point, because the material is piled up at the edges and there is less material in the center, the resistance is also small. At this time, the high-viscosity material layer at the bottom of the tank actually presents a concave or funnel-shaped distribution shape with thick edges and a thin center. If the first air pump directly applies a macroscopic downward static pressure thrust to the top of the metering tank 100 to try to discharge the material, it is understandable that, because the air flow resistance is extremely small, far lower than the internal shear resistance of the high-viscosity material, when gas is injected from the top for pressurization, the air will often seek the path of least resistance. This makes it very easy for the high-pressure air to bypass the thick accumulation area around the edges and directly "pierce" the material layer from the thin center of the metering tank 100, forming a vertical air channel that runs through the top and bottom, i.e., "air hole penetration" or "mouse hole effect". Once a "rat hole" is formed, the pressurized gas will leak rapidly along this channel, causing the pressure inside the tank to drop sharply. This results in most of the material remaining stuck and adhering tightly to the tank walls and bottom corners, causing the precise quantitative feeding operation to completely fail.

[0028] To avoid the aforementioned situation, the air guide shaft 210 moves to its highest point of stroke, the flow channel switching component 400 blocks the first flow channel group and opens the second flow channel group 320, and the airflow is then ejected from the second flow channel group 320, thereby applying a macroscopic pushing force from the outside to the center to the material accumulated at the bottom of the tank, smoothing and pre-compacting the uneven surface of the material due to its high viscosity. This effectively eliminates the voids and surface peaks inside the material, avoids local weak points caused by uneven material thickness, and effectively reduces the possibility of airflow breakdown (mouse hole effect).

[0029] Furthermore, the second flow channel assembly 320 includes a second inner annular flow gap 322 and a second outer annular flow gap 321 opened circumferentially along the outlet nozzle 300. The second inner annular flow gap 322 and the second outer annular flow gap 321 are coaxially arranged and their injection directions are both inclined downward and toward the bottom of the metering tank 100. The second outer annular flow gap 321 has a first flow area, and the second inner annular flow gap 322 has a second flow area. The first flow area is smaller than the second flow area.

[0030] Specifically, under the same internal circulation air supply pressure, the second outer annular flow gap 321 located on the outer ring plays a mechanical throttling and acceleration role due to its smaller first flow area. When the airflow is ejected through this narrow gap, the flow velocity is high, forming a high-speed edge air curtain; this air curtain tilts downward and impacts the outer edge of the bottom of the metering tank 100 (i.e., the area where the tank bottom and side wall meet), converting its kinetic energy into local stagnant pressure, which can both clean up stubborn residues at the bottom corners and prevent materials from rolling outwards; Meanwhile, the second inner annular flow gap 322, located in the inner ring, has a large second flow area. When the airflow is ejected through this gap, it expands and releases pressure, forming a wide volumetric jet with a large flow rate but a relatively low velocity. This large-flow airflow covers the main area at the bottom of the metering tank 100, between the outer edge and the central discharge port 101, and is mainly responsible for providing continuous downward volumetric thrust.

[0031] Furthermore, the flow channel switching assembly 400 includes a slidable blocking core 401 and an actuator 430 drivenly connected to the blocking core 401. The blocking core 401 is provided with a first movable flow blocking part 410 and a second movable flow blocking part 420.

[0032] Specifically, the blocking core 401 is sealed and axially slidably inserted into the air outlet nozzle 300. The actuator 430 is mechanically connected to the top of the blocking core 401 to drive the blocking core 401 to perform a linear reciprocating motion with a defined stroke within the guide valve cavity.

[0033] During the wall-cleaning and sweeping phase of the equipment, the actuator 430 drives the blocking core block 401 to move and maintain it in the first position. At this time, the first movable flow-blocking part 410 has just moved to the bottom, and its outer peripheral surface physically shields and seals the air inlet end of the second outer annular flow gap 321; at the same time, the second movable flow-blocking part 420 also simultaneously shields the second inner annular flow gap 322. Since the second flow channel group 320 at the bottom is blocked, the high-pressure airflow from the circulation channel 211 is forced to converge and is ejected from the first annular flow gap 310, which is in a guided and evacuated state at this time, to perform the wall-cutting and peeling action.

[0034] When the material discharge stage begins, the actuator 430 drives the blocking core 401 to overcome frictional resistance and move axially to the second station. The first active flow-blocking part 410 then moves upward, its outer edge shielding the air inlet of the first annular flow gap 310. While the blocking core 401 frees up bottom space, the air inlets of the second outer annular flow gap 321 and the second inner annular flow gap 322 are exposed and connected to the internal circulation channel 211. The high-pressure airflow changes its physical path, transforming into a bottom-coaxial, diverging pushing jet, applying a continuous pushing force from the periphery to the center to the material at the bottom of the tank. Under the continuous action of this jet, a basin-shaped pressure gradient field with high edge pressure and low center pressure is constructed in the space below the exhaust nozzle 300. This forces the high-viscosity material to overcome its own yield limit, undergo overall plastic flow, and creep towards the central discharge port 101 along the only path of decreasing pressure. This smooths and pre-compacts the surface of the material, effectively avoiding the occurrence of the "mouse hole effect" and ensuring the emptying of the high-viscosity material in the metering tank 100. This, in turn, enables precise metering of the material to the subsequent mixing tank 110 according to the set formula ratio.

[0035] Furthermore, the drive unit includes a power motor 221 fixedly installed on the top of the metering tank 100, a lead screw and nut assembly 222 driven by the power motor 221, and a lifting slide 223 that is connected to the lead screw and nut assembly 222 in a transmission manner; the upper end of the air guide shaft 210 extends out of the top of the metering tank 100 and is fixedly connected to the lifting slide 223.

[0036] To more clearly illustrate the overall operating logic of this invention, the complete process of this device accurately dispensing high-viscosity base material for one soft capsule is as follows: First, the high-viscosity soft capsule material, which needs to be added according to a precise formula ratio, is pre-loaded into the metering tank 100, ready for metered delivery to the mixing tank 110 below. At this time, the feed inlet 102 is closed, and the system starts the first air pump 120. External clean gas is pumped unidirectionally into the metering tank 100 through the air inlet 103 until the tank reaches the preset discharge base positive pressure (static pressure), providing the basic downward pressure force for the high-viscosity material to overcome pipeline resistance and enter the mixing tank 110. At this time, the air guide shaft 210 of the sweeping mechanism 200 remains at the initial position at the top of the metering tank 100.

[0037] When the feeding command is issued, the discharge valve connecting the bottom of the metering tank 100 and the mixing tank 110 opens. The drive unit at the top of the metering tank 100 starts, driving the air guide shaft 210 and the air outlet nozzle 300 at the bottom to descend at a constant speed along the height of the metering tank 100. Simultaneously, the second air pump 130 starts, drawing gas from the top of the metering tank 100 and injecting it into the circulation channel 211 of the air guide shaft 210.

[0038] During this downward movement, the built-in actuator 430 keeps the flow channel switching assembly 400 in the first position. High-pressure circulating gas is intercepted by the blocking core 401 and ejected from the first flow channel group on the side, forming a downward-sloping annular planar jet. This annular planar jet scrapes and peels off the high-viscosity material adhering to the inner wall of the metering tank 100 layer by layer, causing it to fall to the bottom of the metering tank 100 under the combined pressure of gravity and the side airflow. This ensures that no material remains on the wall of the metering tank 100 during the dispensing process, guaranteeing reliable dispensing accuracy. The air guide shaft 210 moves from the highest point of its stroke to the lowest point of its stroke. This process can be repeated several times until the inner wall of the metering tank 100 is completely cleaned, and all adhering high-viscosity material is completely peeled off and accumulates at the bottom of the metering tank 100. Specifically, a camera can be installed inside the metering tank 100. Operators can observe the material residue on the wall through the camera, thereby controlling the up-and-down reciprocating motion of the drive air shaft 210 and the start and stop of the second air pump 130 until the residual material on the wall is cleaned up relatively thoroughly.

[0039] After the wall cleaning action is completed, the surface smoothing and pre-compaction stage begins. At this time, the air guide shaft 210 first moves and resets to the highest point of its stroke, and then the actuator 430 drives the blocking core block 401 to overcome friction and complete axial displacement, switching to the second station.

[0040] At this moment, the first annular flow gap 310 is instantly blocked, and the side sweeping airflow stops; simultaneously, the second flow channel group 320 at the bottom (the second inner and outer annular flow gaps) is opened. The circulating high-pressure airflow changes its path and transforms into an annular scattering flow toward the bottom of the metering tank 100. The high-speed edge air curtain ejected from the small outer gap sweeps away the dead corners at the bottom of the tank, while the high-flow airflow ejected from the large inner gap provides downforce. Together, they create a basin-shaped pressure gradient field below the outlet nozzle 300, characterized by "high wind pressure at the outer edge and low wind pressure at the central discharge port 101".

[0041] Under the strong extrusion of high dynamic pressure at the edges and the guidance of relatively low pressure at the center, the material accumulated at the edge of the inner wall of the metering tank 100 is forced to plastically flow and fill the low-lying area at the center, thus forcibly smoothing the uneven surface of the material. This process eliminates the hidden danger of local high-pressure airflow directly piercing the material layer from the center and forming a "rat hole effect," achieving the emptying of the base material in the metering tank 100 and ensuring the accuracy of the formula ratio in the mixing tank 110. Similarly, the operator can also observe the smoothing of the material through a camera to control the start and stop of the second air pump 130.

[0042] Next, the system restarts the first air pump 120, and external clean gas is pumped into the metering tank 100 through the air inlet 103, so that the air pressure in the metering tank 100 reaches the discharge basis positive pressure (static pressure) again, and finally the material at the bottom of the metering tank 100 is discharged into the mixing tank 110 more thoroughly.

[0043] Finally, after the material at the bottom of the metering tank 100 is discharged into the mixing tank 110, the system controls the discharge valve to close, and the second air pump 130 stops running (or is in an idling state under pressure). It then awaits the receipt of the next batch of ingredients.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A precision dosing device suitable for soft capsule production, comprising a mixing tank and a dosing tank in communication with the mixing tank, the dosing tank being provided with a discharge port at the bottom and a feed port and an air inlet at the top, characterized in that, The air inlet is connected to a first air pump, which can input outside gas into the metering tank. The metering tank is also provided with a sweeping mechanism, which includes an air guide shaft and a drive unit connected to the air guide shaft. The drive unit can drive the air guide shaft to slide along the height direction of the metering tank. One end of the air guide shaft is connected to an air outlet nozzle. The metering tank is equipped with a second air pump, the air inlet of the second air pump is connected to the top of the metering tank, and the air guide shaft has a circulation channel inside that connects the air outlet of the second air pump to the air outlet nozzle.

2. The precision dispensing device for soft capsule production according to claim 1, characterized in that, The exhaust nozzle includes a first flow channel group and a second flow channel group; The air outlet nozzle is provided with a flow channel switching component; the flow channel switching component can selectively open the first flow channel group and block the second flow channel group, or block the first flow channel group and open the second flow channel group.

3. The precision dispensing device for soft capsule production according to claim 2, characterized in that, When the airflow generated by the second air pump flows through the first flow channel group, it forms an annular planar jet acting on the side wall of the metering tank.

4. A precision dispensing device for soft capsule production according to claim 3, characterized in that, The first flow channel assembly includes a first annular flow gap formed circumferentially along the outlet nozzle; The injection direction of the first annular flow gap is inclined downward and toward the inner wall of the metering tank.

5. A precision dispensing device for soft capsule production according to claim 2, characterized in that, When the airflow generated by the second air pump flows through the second flow channel group, it forms an annular scattering flow toward the bottom of the metering tank; and inside the metering tank below the outlet nozzle, a pressure gradient field is formed with a lower central air pressure and a higher outer edge air pressure.

6. A precision dispensing device for soft capsule production according to claim 5, characterized in that, The second flow channel group includes a second inner annular flow gap and a second outer annular flow gap opened along the circumference of the outlet nozzle. The second inner annular flow gap and the second outer annular flow gap are coaxially arranged and their injection directions are both inclined downward and toward the bottom of the metering tank. The second outer annular flow gap has a first flow area, and the second inner annular flow gap has a second flow area, wherein the first flow area is smaller than the second flow area.

7. A precision dispensing device for soft capsule production according to claim 2, characterized in that, The flow channel switching assembly includes a slidable blocking core block and an actuator drivenly connected to the blocking core block. The blocking core block is provided with a first movable flow-blocking part and a second movable flow-blocking part.

8. A precision dispensing device for soft capsule production according to claim 1, characterized in that, The drive unit includes a power motor fixedly installed on the top of the metering tank, a lead screw and nut assembly driven by the power motor, and a lifting slide connected to the lead screw and nut assembly; the upper end of the air guide shaft extends out of the top of the metering tank and is fixedly connected to the lifting slide.

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