A secondary throwing micro-capsule precision filling mechanism

Abstract

The present application relates to the technical field of filling, in particular to a secondary polishing micro-capsule precise filling mechanism. It comprises a conveying assembly, a filling assembly and a controller arranged on a workbench, the controller is electrically connected with the conveying assembly and the filling assembly respectively; the filling assembly comprises a liftable filling head, a differential pressure control valve and a quantitative feeder which are sequentially assembled along a vertical axis from bottom to top; the quantitative feeder is electrically connected with the controller, the input end of the quantitative feeder is externally connected with an external cosmetic supply device, the output end of the quantitative feeder is connected with the liftable filling head through a flexible hose to form a closed filling pipeline; the pipeline between the differential pressure control valve and the quantitative feeder forms a pre-valve pressure accumulation area, and the pipeline between the differential pressure control valve and the liftable filling head forms a post-valve filling area. The present application solves the filling errors and bottle mouth liquid hanging defects caused by pipeline pressure fluctuation of the filling device, realizes the precise and stable operation of secondary polishing micro-capsule filling, and improves the filling precision and production yield of secondary polishing micro-capsule.

Description

Technical Field

[0001] This invention relates to the field of filling technology, and more particularly to a precision filling mechanism for single-displacement microcapsules. Background Technology

[0002] In the cosmetic packaging industry, microcapsules made of flexible rubber, due to their softness, tiny opening, and susceptibility to pressure deformation, meet consumers' demands for portability and aesthetics in cosmetics, and have become one of the important development directions in cosmetic packaging in recent years. These capsules have an extremely small overall volume, belonging to micro-filling containers, and require extremely high precision in cosmetic filling. Unlike conventional cosmetic capsules, microcapsules can hold very little material, resulting in a very low filling error rate, making it a challenging scenario in micro-filling production.

[0003] Existing traditional cosmetic filling equipment is mostly designed for standard-capacity bottled products, resulting in a relatively large overall filling volume and a wide allowable range of filling errors. Conventional filling equipment has low precision in controlling fluctuations in pipeline fluid pressure and minor discharge deviations. In conventional capsule filling production, small pressure fluctuations or excess or insufficient material do not significantly affect the quality of the finished product. Therefore, existing equipment generally lacks precise pipeline differential pressure adjustment structures and high-precision micro-quantification structures.

[0004] When applied to the production of microcapsules for single-use packaging, these structural defects are amplified. Because the microcapsules are extremely small, a single drop of cosmetic material can occupy a significant proportion of the total capsule volume, making them highly sensitive to filling errors. During filling, even a slight fluctuation in pipeline pressure causing an extra drop to flow out will directly result in material overflow, capsule contamination, and product spoilage. Conversely, a single drop less will lead to substandard cosmetic content in the bottle, resulting in defective products and severely impacting product qualification rates and production precision. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a single-use microcapsule precision filling mechanism.

[0006] The objective of this invention can be achieved through the following technical solutions: A precision filling mechanism for single-use microcapsules, used in filling equipment, includes a conveying component, a filling component, and a controller mounted on a workbench. The controller is electrically connected to both the conveying component and the filling component. The conveying component transports the single-use microcapsules to be filled to the filling station. The filling component includes a liftable filling head, a differential pressure control valve, and a metering feeder, assembled sequentially from bottom to top along a vertical axis. The metering feeder is electrically connected to the controller, and its input end is connected to an external cosmetic feeding device. Its output end is connected to the liftable filling head via a flexible hose, forming a closed filling pipeline. The pipeline between the differential pressure control valve and the metering feeder forms a pre-valve pressure accumulator zone, and the pipeline between the differential pressure control valve and the liftable filling head forms a post-valve filling zone.

[0007] As a further technical solution of the present invention, the liftable filling head includes an electric lifting push rod, a fixing plate, a filling connector, and a filling needle; the fixed end of the electric lifting push rod is located on the filling assembly and is electrically connected to the controller; the fixing plate is located on the telescopic end of the electric lifting push rod; the filling connector is located on the fixing plate; the input end of the filling connector is connected to the flexible hose; and the output end is connected to the filling needle; the electric lifting push rod drives the filling needle to approach or move away from the bottle mouth of the single-use microcapsule.

[0008] As a further technical solution of the present invention, the differential pressure control valve is a shut-off valve, the shut-off valve is electrically connected to the controller, the distance between the two ends of the filling area after the valve is shorter than the distance between the two ends of the accumulating area before the valve, the filling area after the valve forms a closed microcavity, and the shut-off valve, in conjunction with the timing control shut-off closure, makes the closed microcavity form a negative pressure, thereby realizing the back suction of residual liquid at the injection needle port to prevent dripping.

[0009] As a further technical solution of the present invention, the metering feeder of the filling component is a metering pump; used to control the filling volume of cosmetic materials in a single batch.

[0010] As a further technical solution of the present invention, the differential pressure control valve, the metering feeder, the injection needle, and the flexible tubing on the coaxial axis constitute a group of injection units. The injection assembly is provided with multiple groups of injection units, and each group of injection units corresponds coaxially with a single single-shot microcapsule.

[0011] As a further technical solution of the present invention, it also includes a positioning calibration component, which corresponds to the filling station. The positioning calibration component includes an electric displacement push rod and a clamping plate. The fixed end of the electric displacement push rod is located on the workbench and is electrically connected to the controller. The clamping plate is located at the telescopic end of the electric displacement push rod. The electric displacement push rod drives the clamping plate to move closer to or away from the side of the fixture, thereby stabilizing the fixture.

[0012] As a further technical solution of the present invention, it also includes two calibration wheels, which are respectively rotatably disposed on both sides of the fixed plate to limit the two ends of the fixture.

[0013] As a further technical solution of the present invention, it also includes a visual inspection instrument, which is disposed on the worktable and electrically connected to the controller, and the inspection port of the visual inspection instrument is aligned with a plurality of microcapsules.

[0014] As a further technical solution of the present invention, the external cosmetic feeding device is equipped with a vacuum pump. The liquid material is pre-defoamed and conveyed to the quantitative feeder by the cosmetic feeding device through the alternating positive and negative pressure operation of the vacuum pump.

[0015] The beneficial effects of this invention are as follows: Employing a vertically coaxial layout with a liftable filling head, differential pressure control valve, and quantitative feeder, this system achieves precise alignment between the filling needle and the mouth of the micro-disposable microcapsule bottle, forming a closed filling pipeline with a flexible tubing. Addressing the challenge of fluid inertia-induced pressure fluctuations during dynamic start-stop operations in this closed filling pipeline, an electrically controlled differential pressure control valve, in conjunction with a PLC controller, precisely eliminates negative pressure in the pipeline fluid chamber and balances internal pressure at the end of each filling cycle. This effectively suppresses instantaneous positive pressure spikes and negative pressure gaps caused by fluid inertia during start-stop operations, resolving defects such as overfilling, excessive dripping, final dripping, and liquid residue at the bottle mouth caused by pipeline pressure fluctuations. It also avoids problems such as large resistance deviations, strong inertial impacts, and continuous pressure oscillations caused by pipeline issues, improving the pressure stability of the closed pipeline filling process. This enables precise and stable micro-disposable microcapsule filling, improving the filling accuracy and production yield of micro-bottled cosmetics. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of A in the middle; Figure 3 For the present invention Figure 2 Enlarged view of B in the middle; Legend: 1. Workbench; 2. Controller; 3. Conveyor seat; 41. Metering pump; 42. Electric lifting push rod; 43. Shut-off valve; 44. Electric displacement push rod; 45. Clamping plate; 46. Injection connector; 47. Injection needle; 5. Sealing mechanism; 6. Vision inspection instrument; 7. Fixture; 8. Calibration wheel; 9. Fixing plate. Detailed Implementation

[0018] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0019] Currently, microcapsules, due to their soft, easily squeezed liquid body and easily openable seal, meet consumers' demands for portability and aesthetics in cosmetics. However, the volume of a single-use microcapsule is extremely small, and the amount of material it can hold is minimal. Therefore, the term "single-use microcapsule" literally means disposable, tiny, and liquid-filled, belonging to the category of micro-volume filling containers. Unlike conventional cosmetic bottles, single-use microcapsules require extremely high precision in cosmetic filling. Due to the tiny size of the capsule, the filling error rate is extremely low, making it a challenging scenario in micro-volume filling production. In the closed fluid chamber of the filling equipment, a static pressure-holding state without fluctuations is formed. The dynamic conditions of starting and stopping during the filling process are the fundamental source of pressure fluctuations. Dynamic operation inevitably produces fluctuations. Considering the mass and inertia characteristics of cosmetic liquids, when the metering pump 41 pumps the material out, the fluid in the pipeline is in a state of uniform flow. When a single filling metering is completed, the metering pump 41 suddenly stops to cut off the material. The high-speed flowing liquid in the pipeline cannot stop instantly and will continue to squeeze the fluid at the front end of the pipeline, causing the pipeline to have an instantaneous positive pressure surge, resulting in excessive dripping and overfilling. Conversely, at the moment the equipment starts filling, the fluid accelerates rapidly from stillness, which will form an instantaneous negative pressure gap, resulting in low pressure fluctuations, causing leakage at the end and liquid residue on the bottle mouth. The longer the pipeline, the greater the frictional resistance deviation; the greater the fluid pressure accumulation mass, the more the inertial impact force of the fluid increases during start-up and shutdown.

[0020] In this regard, refer to Figures 1-3As shown, a precision filling mechanism for single-use microcapsules is disclosed, including a conveying component, a filling component, and a controller 2 mounted on a workbench 1. The controller 2 is electrically connected to both the conveying component and the filling component. The conveying component transports the single-use microcapsules to be filled to the filling station and transports the filled microcapsules to the sealing mechanism 5. The sealing mechanism 5 is located on the workbench 1 and is positioned below the filling component. The conveying component is equipped with a conveying seat 3 and a fixture 7. The conveying seat 3 adopts an existing chain drive structure and has multiple mounting positions equidistantly arranged on it. Each mounting position is equipped with a fixture 7 adapted to the shape of the single-use microcapsules, used to limit the movement of the microcapsules during transport, ensuring that the capsules do not shift, tip over, or deform during high-speed transport. The controller 2 is a PLC controller. The filling component is arranged corresponding to the filling station, including components arranged from bottom to top along the vertical axis. The system consists of a liftable filling head, a differential pressure control valve, and a metering feeder, all assembled sequentially. These three components are arranged coaxially, with the axis coinciding with the central axis of the microcapsules at the filling station. This ensures the liftable filling head is precisely aligned before contacting the bottle opening and allows for smooth, impact-free insertion. The metering feeder's input is connected to an external cosmetic feeding device. Because microcapsules are tiny, even a small air bubble in the liquid material can diffuse significantly upon entering the capsule, defoaming is necessary before the liquid enters the pipeline to ensure effective filling. The liquid material is defoamed by an external vacuum pump using alternating positive and negative pressure. This pre-defoaming process utilizes existing mature technology to effectively remove most air bubbles, reducing their impact on filling accuracy from the source. The other end is connected to the liftable filling head via a flexible hose, forming a closed filling pipeline. The pipeline between the differential pressure control valve and the metering feeder forms the pre-valve pressure accumulator zone, and the pipeline between the differential pressure control valve and the liftable filling head forms the post-valve filling zone. In addition, the differential pressure control valve and the filling connector 46 of the liftable filling head are arranged at a short distance, so that the post-valve filling zone forms a very small closed microcavity. When each filling is about to stop, the controller 2 controls the differential pressure control valve to eliminate the negative pressure in the internal fluid cavity according to the set start time, so that the pressure inside the flexible hose is normal, thereby controlling the liquid delivery state in the flexible hose and solving the problems of pipeline pressure fluctuation and low filling metering accuracy in traditional cosmetic filling equipment.

[0021] Based on the above, the liftable filling head includes an electric lifting push rod 42, a fixing plate 9, a filling connector 46, and a filling needle 47. The electric lifting push rod 42 is an existing electric push rod, with its fixed end located on the filling assembly and electrically connected to the controller 2. The opening and closing interval and stroke of the electric push rod are controlled and adjustable by the controller 2. The fixing plate 9 is located at the telescopic end of the electric lifting push rod 42, and the filling connector 46 is located on the fixing plate 9. The input end of the filling connector 46 is connected to a flexible hose, and the output end is connected to the filling needle 47. The electric lifting push rod 42 drives the fixing plate 9 to move the filling needle 47 closer to or further away from the bottle mouth of the microcapsule. Through the above settings, the automatic lifting and coaxial alignment of the filling needle 47 and the micro rubber bottle mouth, as well as the replacement of the filling station of the micro microcapsule, are realized.

[0022] The differential pressure control valve is a shut-off valve 43, which is electrically connected to the controller 2. When each single filling is about to stop, the controller 2 controls the shut-off valve 43 to eliminate the negative pressure in the fluid cavity according to the set start time, so that the pressure inside the flexible hose is normal; thus solving the problems of uncontrollable differential pressure and unstable material conveying speed in traditional filling pipelines.

[0023] Specifically, to solve the pressure fluctuation problem, a shut-off valve 43 is used. Its purpose is to eliminate pressure fluctuations from the source through four directions: pipeline segmentation isolation, energy storage cut-off, pressure blocking, and micro-cavity pressure stabilization, adapting to micro-volume filling conditions. The specific principle is as follows: First, pipeline segmentation isolation is achieved to cut off the energy storage transmission path; after the middle shut-off valve 43 is closed, the original flexible hose is divided into two independent sealed cavities: the pressure storage area before the valve (from metering pump 41 to shut-off valve 43) and the filling area after the valve (from shut-off valve 43 to filling needle 47). The distance between the two ends of the filling area after the valve is shorter than the distance between the two ends of the pressure storage area before the valve, forming a closed microcavity in the filling area after the valve. The shut-off valve 43, in conjunction with the timing control, closes to create negative pressure in the closed microcavity, achieving back-suction of residual liquid at the port of the filling needle 47 to prevent dripping. At the moment the filling ends and the metering pump 41 stops, the controller 2 controls the shut-off valve 43 to close synchronously. The inertial impact force of the fluid in the long pipeline before the isolation valve and the elastic recoil pressure energy of the hose prevent all pressure fluctuations and energy storage oscillations before the valve from being transmitted to the needle tip. It should also be noted that the cavity volume of the filling area after the valve corresponds to the filling volume of the micro-disposable microcapsule, solving the problem of excessive dripping and overfilling caused by the positive pressure surge when the pump stops. Secondly, it minimizes the effective fluctuation pipeline volume. The pipeline after the shut-off valve 43 is extremely short, the fluid storage is minimal, and the elastic deformation space of the hose is extremely small, with virtually no pressure storage capacity. Compared to the traditional structure where the entire hose is pressurized, this design minimizes effective fluid energy storage, inertial impact, and elastic pressure release at the needle tip. There are no significant pressure oscillations in the pipeline after the valve, allowing for rapid restoration of pressure stability and structurally avoiding the defects of pressure fluctuations in long pipelines. Thirdly, it precisely eliminates pipeline negative pressure and tension imbalance defects. At the final stage of a single filling cycle, the controller 2 pre-closes the central shut-off valve 43 to cut off the flow path, locking the pressure in the micro-cavity after the valve. This prevents a sudden pump stoppage that could cause a negative pressure gap in the entire pipeline, maintaining pressure balance between the needle tip and external atmospheric pressure, ensuring stable liquid surface tension, and resolving issues such as delayed dripping, bottle mouth dripping, and even leakage at the end of the filling process caused by negative pressure drop. This achieves precise flow interruption at the moment of filling. Fourthly, it suppresses pressure wave reflection and superposition disturbances. The central shut-off valve 43 directly cuts off the reciprocating propagation, reflection, and superposition of pressure waves throughout the pipeline, preventing continuous pressure oscillations in the long pipeline from disturbing the filling steady state and ensuring a stable flow at the needle tip after the valve. The pressure in the pipeline remains constant, adapting to the micro-filling requirements of micro-disposable microcapsules with extremely low error tolerance; fifth, the short-distance pipeline after the valve is used in conjunction with the timing control of the shut-off valve 43 to achieve shut-off closure and create negative pressure to achieve back suction and prevent dripping: due to the short pipeline distance and small cavity volume between the shut-off valve 43 and the filling connector 46, when the filling is completely stopped and the shut-off valve 43 remains closed, the sealed micro-cavity after the valve will drop slightly with the fluid level to form a stable negative pressure. This negative pressure can draw back the residual liquid hanging at the port of the filling needle 47 due to the surface tension of the liquid to the inside of the pipeline after the valve, fundamentally eliminating the phenomenon of needle dripping and bottle mouth hanging after the filling is completed.It achieves self-negative pressure back suction by relying on the existing shut-off valve 43 and the short pipeline after the valve, without the need for additional negative pressure generating device. The structure is simplified and the action is synchronized with the filling flow interruption, which is suitable for micro-filling operation requirements.

[0024] Because traditional filling equipment struggles to accurately control the volume of material in a single filling of micro-sized cosmetic bottles, it is prone to problems such as overfilling, underfilling, and large filling capacity errors, resulting in low product yield and failing to meet the precision production requirements of micro-sized cosmetics. In this embodiment, the quantitative feeder of the filling component is set as a metering pump 41 structure. The metering pump 41 accurately measures and controls the single delivery and filling volume of cosmetic materials. Specifically, the metering pump 41 uses a high-precision stepper motor to drive a ceramic plunger, and a grating encoder provides real-time displacement feedback to calculate the single filling flow rate. The controller 2 has a built-in flow calculation model. Combining the effective cross-sectional area of ​​the ceramic plunger, the plunger stroke displacement collected by the grating encoder, material density, and filling time parameters, it calculates the instantaneous filling flow rate and the single cumulative filling flow rate in real time, and compares the calculated flow rate with the preset standard flow rate. When the flow deviation exceeds the threshold, the controller 2 dynamically corrects the stepper motor speed and plunger advance speed to form a flow closed-loop control, achieving accurate calculation and deviation correction of the filling flow rate throughout the entire process. This technology enables precise control of the volume of cosmetic materials in each filling operation, minimizing filling errors in micro-bottle cosmetics and improving product filling accuracy and yield. It solves the problems of traditional equipment's inability to accurately control the filling volume per cycle and its large filling capacity errors.

[0025] To improve filling efficiency, in one embodiment, the differential pressure control valve, quantitative feeder, filling needle 47, and corresponding flexible hose are set as a group; each group of filling units is equipped with a pre-vacuum pump for defoaming, and the shut-off valve 43 and filling connector 46 of each group of units are arranged with short-distance pipelines, which have independent negative pressure back suction capability; at the same time, multiple identical filling units are arranged on the filling assembly, and each group of filling units is coaxially aligned with a single single-use microcapsule, so as to realize the synchronous filling operation of multiple single-use microcapsules, improve the filling production efficiency of micro-bottle cosmetics, and solve the problem of low efficiency of a single group of filling components.

[0026] To ensure proper alignment and prevent misalignment between the microcapsule mouth and the filling needle 47 after the microcapsule is transported to the filling station with the fixture 7, a positioning calibration component corresponding to the filling station is added in one embodiment. The positioning calibration component consists of an electric displacement push rod 44 and a clamping plate 45. The electric displacement push rod 44 is an existing electric push rod device, with its fixed end installed on the workbench 1 and electrically connected to the controller 2. The clamping plate 45 is fixed to the telescopic end of the electric displacement push rod 44. The electric displacement push rod 44 is driven before the electric lifting push rod 42. The controller 2 controls the extension and retraction of the electric displacement push rod 44, driving the clamping plate 45 to move closer to or away from the side of the fixture 7 to clamp or release the fixture 7. This stably clamps and fixes the fixture 7 before the filling operation, ensuring the alignment accuracy and operational stability during subsequent filling. This solves the problem of misalignment between the microcapsule body and the filling needle 47 at the filling station, which leads to inaccurate filling alignment and poor filling quality.

[0027] Relying solely on a single clamping plate 45 to hold the positioning fixture 7 may result in problems such as lateral displacement or tilting at both ends of the fixture 7, leading to insufficient overall limiting and difficulty in ensuring positioning accuracy, thus affecting the coaxial filling effect. In one embodiment, a calibration wheel 8 is rotatably mounted on each of the left and right sides of the fixing plate 9. When the electric lifting push rod 42 drives the fixing plate 9 to rise and fall, the two calibration wheels 8 simultaneously roll closer to both sides of the fixture 7. The two symmetrically arranged calibration wheels 8 form limiting constraints on both ends of the fixture 7, solving the limiting problem at both ends of the fixture 7, improving the positional stability of the fixture 7 and the secondary disposable microcapsule, ensuring the coaxiality of the filling structure and the capsule, and improving the filling accuracy.

[0028] The leakage problem caused by the pressure of the flexible hose is solved by the aforementioned shut-off valve 43. However, during the filling process, due to the thin and soft walls and small size of the micro-disposable microcapsules, the following two situations may occur when the filling needle 47 is inserted: First, it may be inserted crookedly into the capsule rubber, causing overflow from the bottle and dripping onto the surface of the fixture 7, resulting in dirt; second, even if the filling needle 47 is aligned with the capsule, there may still be overflow, which also causes dirt to appear on the bottle and the surface of the fixture 7. To avoid the above-mentioned filling contamination risks and the waste of production materials and time, in one embodiment, a vision inspection instrument 6 is installed on the workbench 1. The visual inspection instrument 6 is electrically connected to the controller 2, and the detection port of the visual inspection instrument 6 is aligned with several disposable microcapsules on the workbench 1. Each disposable microcapsule corresponds to a filling station. Since the fixture 7 and the disposable microcapsules are fixed for filling, the existing visual inspection instrument 6 is used to collect the placement status, position information, and surface stain distribution characteristics of the bottle body and fixture 7 in real time to obtain two-dimensional side image information of the bottle body and fixture 7. The controller 2 compares the standard clean template in real time based on the image recognition algorithm. The standard clean template is collected in advance. Once stains or position deviations exceed the limit, an alarm is immediately triggered and the filling process is suspended.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A precision filling mechanism for single-use microcapsules, used in filling equipment, characterized in that, The system includes a conveying assembly, a filling assembly, and a controller mounted on a workbench. The controller is electrically connected to both the conveying assembly and the filling assembly. The conveying assembly is used to transport the microcapsules to be filled to the filling station. The filling assembly includes a liftable filling head, a differential pressure control valve, and a metering feeder, which are assembled sequentially from bottom to top along a vertical axis. The metering feeder is electrically connected to the controller, and its input end is connected to an external cosmetic feeding device. Its output end is connected to the liftable filling head via a flexible hose, forming a closed filling pipeline. The pipeline between the differential pressure control valve and the metering feeder forms a pre-valve pressure accumulator zone, and the pipeline between the differential pressure control valve and the liftable filling head forms a post-valve filling zone.

2. The single-use microcapsule precision filling mechanism according to claim 1, characterized in that: The liftable filling head includes an electric lifting push rod, a fixing plate, a filling connector, and a filling needle. The fixed end of the electric lifting push rod is located on the filling assembly and is electrically connected to the controller. The fixing plate is located on the telescopic end of the electric lifting push rod. The filling connector is located on the fixing plate. The input end of the filling connector is connected to the flexible tubing, and the output end is connected to the filling needle. The electric lifting push rod drives the filling needle to approach or move away from the bottle opening of the single-use microcapsule.

3. The single-use microcapsule precision filling mechanism according to claim 2, characterized in that: The differential pressure control valve is a shut-off valve, which is electrically connected to the controller. The distance between the two ends of the filling area after the valve is shorter than the distance between the two ends of the accumulator area before the valve. The filling area after the valve forms a closed microcavity. The shut-off valve, in conjunction with the timing control shut-off closure, makes the closed microcavity form a negative pressure, thereby realizing the back suction of residual liquid at the injection needle port to prevent dripping.

4. The single-use microcapsule precision filling mechanism according to claim 1, characterized in that: The metering pump is a quantitative feeder for the filling assembly. The metering pump is equipped with a stepper motor, a ceramic plunger, and a grating encoder. The device is equipped with a controller with a built-in flow calculation model. The controller collects feedback signals from the grating encoder to calculate the filling flow rate in real time and performs closed-loop correction. It calculates the instantaneous and cumulative flow rates based on the effective cross-sectional area of ​​the plunger, the stroke displacement, the material density, and the filling time. When the flow rate exceeds the threshold, the controller adjusts the stepper motor speed and the plunger advance speed to control the single cosmetic filling volume.

5. The single-use microcapsule precision filling mechanism according to claim 1, characterized in that: The differential pressure control valve, metering feeder, filling needle, and flexible tubing on the coaxial axis form a filling unit. The filling assembly is provided with multiple filling units, and each filling unit corresponds coaxially with a single single-use microcapsule.

6. The single-use microcapsule precision filling mechanism according to claim 1, characterized in that: It also includes a positioning calibration component, which is set to correspond to the filling station. The positioning calibration component includes an electric displacement push rod and a clamping plate. The fixed end of the electric displacement push rod is located on the workbench and is electrically connected to the controller. The clamping plate is located at the telescopic end of the electric displacement push rod. The electric displacement push rod drives the clamping plate to move closer to or away from the side of the fixture, thereby stabilizing the fixture.

7. The single-use microcapsule precision filling mechanism according to claim 2, characterized in that: It also includes two calibration wheels, which are respectively rotatably mounted on both sides of the fixed plate to limit the two ends of the fixture.

8. The single-use microcapsule precision filling mechanism according to claim 1, characterized in that: It also includes a visual inspection instrument, which is located on the workbench and electrically connected to the controller. The inspection port of the visual inspection instrument is aligned with several microcapsules.

9. The single-use microcapsule precision filling mechanism according to claim 1, characterized in that: The external cosmetic feeding equipment is equipped with a vacuum pump. The liquid material is pre-defoamed and conveyed to the quantitative feeder by the alternating positive and negative pressure operation of the vacuum pump.

Images