A high-precision filling mechanism

Abstract

This utility model provides a high-precision filling mechanism, relating to the field of filling equipment technology. It includes a main body and an injection section. The injection section is mounted on the main body and is sealed to it, forming a receiving cavity between them. An inlet is located at the end of the main body away from the injection section. The injection section has multiple injection holes arranged in a row, which connect to the receiving cavity. The injection section is connected to a filling unit. Material enters the receiving cavity through the inlet and is precisely injected into the filling unit through the injection holes. The sealed receiving cavity structure formed by the main body and the injection section, combined with the multi-hole injection design, achieves precise material distribution under stable pressure while effectively suppressing air bubble generation. This provides advantages such as improved filling accuracy, elimination of air bubble interference, and enhanced sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of filling equipment technology, and in particular to a high-precision filling mechanism. Background Technology

[0002] In the production process of a blow-fill-seal integrated machine, the filling unit is the core component for achieving precise product filling. Traditional filling mechanisms have significant drawbacks when handling products prone to foaming: air bubbles easily accumulate during material transport, leading to decreased filling accuracy; pressure fluctuations during filling are difficult to control precisely, affecting the uniformity of material distribution; and unreasonable sealing structure design may cause material leakage or contamination. Especially in fields with strict hygiene requirements, such as food and pharmaceuticals, these problems directly impact product quality and production efficiency. While various filling solutions exist in existing technologies, they generally suffer from complex structures and insufficient control precision, failing to meet the demands of high-precision filling. After completing online cleaning and sterilization processes, the continuous production process from preform extrusion to molding and filling in blow-fill-seal equipment urgently requires a filling mechanism that can stably control material flow and effectively eliminate air bubble interference.

[0003] To address the aforementioned issues, a high-precision filling mechanism is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision filling mechanism, which has the advantages of improving filling accuracy, eliminating air bubble interference, and enhancing sealing performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The high-precision filling mechanism according to an embodiment of the present invention includes: a main body and an injection part, wherein the injection part is mounted on the main body and is sealed to the main body, and a receiving cavity is formed between the injection part and the main body; an inlet is provided at one end of the main body away from the injection part; a plurality of injection holes are provided on the injection part, the injection holes communicating with the receiving cavity; the injection part is connected to a filling unit; material enters the receiving cavity through the inlet and is precisely injected into the filling unit through the injection holes.

[0007] According to the embodiments of the present invention, the high-precision filling mechanism, through the sealed accommodating cavity structure formed by the main body and the liquid injection part, combined with the porous liquid injection design, achieves precise distribution of the material under stable pressure, while effectively suppressing the generation of air bubbles, and has the advantages of improving filling accuracy, eliminating air bubble interference, and enhancing sealing performance.

[0008] In addition, the high-precision filling mechanism according to the above embodiments of this utility model may also have the following additional technical features:

[0009] In some embodiments of this utility model, the main body is provided with a through hole, which is located at one end of the main body away from the liquid injection part, and the through hole communicates with the receiving cavity.

[0010] In some embodiments of this utility model, the main body is further provided with a volume groove, the volume groove is located near the through hole and at the end of the through hole away from the liquid injection part, and the through hole is connected to the volume groove.

[0011] In some embodiments of this utility model, the main body is further provided with a throttling hole, the throttling hole is disposed close to the volume groove, and the throttling hole communicates with the volume groove.

[0012] In some embodiments of this utility model, a first connector is further included. The first connector is detachably mounted on the main body. The first connector is disposed near the throttling orifice. The first connector is provided with a first inner hole, which communicates with the through hole, the volume groove and the throttling orifice.

[0013] In some embodiments of this utility model, a diaphragm and a pressure plate are also included. The diaphragm is configured as an elastic element and is installed in the volume groove. The pressure plate is installed on the main body and presses the diaphragm into the volume groove.

[0014] In some embodiments of this utility model, the pressure plate is provided with a control flow channel, one end of which leads to the diaphragm and the other end of which connects to the external environment.

[0015] In some embodiments of this utility model, a second connector is further included. The second connector is detachably mounted on the pressure plate. The second connector is provided with a second inner hole, which communicates with the control flow channel.

[0016] In some embodiments of this utility model, a solenoid valve is also included, one end of which is connected to the second connector and the solenoid valve is in communication with the second connector, and the other end of which is connected to a gas source.

[0017] In some embodiments of this utility model, a control system is also included, which is electrically or communicatively connected to the solenoid valve.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the high-precision filling mechanism according to an embodiment of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the high-precision filling mechanism according to an embodiment of the present invention. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the high-precision filling mechanism according to an embodiment of the present invention. Figure 3 .

[0022] Figure Labels

[0023] 1. Injection section; 11. Injection hole; 2. Inlet; 3. Main body; 31. Throttling hole; 32. Through hole; 33. Volumetric trough; 4. First connector; 5. Second connector; 6. Pressure plate; 61. Control flow channel; 7. Diaphragm; 8. Solenoid valve; 9. Receiving cavity. Detailed Implementation

[0024] The high-precision filling mechanism of this utility model will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of the utility model. It should be understood that those skilled in the art can modify the utility model described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the utility model.

[0025] In the description of this specification, terms such as "one embodiment" or "some embodiments" mean that one or more embodiments of this specification include a particular feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0026] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In existing technologies, blow-fill-seal equipment is widely used in the food and pharmaceutical packaging industries, where the filling unit is responsible for injecting the material into the molded container. Conventional filling mechanisms use a single-point injection method, resulting in a long material transport path that is prone to turbulence and pressure fluctuations. For products prone to foaming, this structure can cause air bubbles to mix into the material, leading to volume deviations in the filling process. Existing technologies attempt to improve accuracy by optimizing control logic, but they do not fundamentally address the design flaws in the flow path, resulting in limited improvements in filling accuracy.

[0028] To address the aforementioned issues, an analysis of the bubble formation mechanism during the filling process of easily foaming products revealed that excessively long material flow paths and unstable pressure are the primary contributing factors. Based on this, a method was developed to shorten the material transport path and establish a pressure buffer zone. By integrating the injection structure with the main structure, a closed flow environment was created. Simultaneously, a multi-point dispersed injection method was employed to balance local pressure and reduce turbulence.

[0029] Therefore, this utility model proposes a high-precision filling mechanism, which is described below with reference to the accompanying drawings.

[0030] The high-precision filling mechanism according to an embodiment of the present utility model, such as Figure 1 As shown, it includes: a main body 3 and an injection part 1. The injection part 1 is mounted on the main body 3 and is sealed to the main body 3. A receiving cavity 9 is formed between the injection part 1 and the main body 3. The main body 3 is provided with an inlet 2 at one end away from the injection part 1. The injection part 1 is provided with a plurality of injection holes 11 arranged in a row. The injection holes 11 are connected to the receiving cavity 9. The injection part 1 is connected to the filling unit. The material enters the receiving cavity 9 through the inlet 2 and is precisely injected into the filling unit through the injection holes 11.

[0031] The main body 3 refers to the foundation component supporting the filling mechanism, which can be made of stainless steel or engineering plastic and is used to support the injection section 1 and provide a material flow channel. The injection section 1 refers to the injection assembly that cooperates with the main body 3, which can be connected to the main body 3 via a flange or threads, and has an array of injection holes 11 machined inside. The receiving cavity 9 refers to the closed space enclosed by the main body 3 and the injection section 1, which can be sealed by a sealing ring or welding, and is used to temporarily store the material and buffer pressure fluctuations. The inlet 2 refers to the entrance of the material into the receiving cavity 9, which can be located at the axial end of the main body 3 to guide the material to flow in a preset direction. The injection holes 11 refer to the array of through holes 32 penetrating the injection section 1, which can be arranged in an equally spaced manner, and the hole diameter can be adjusted according to the viscosity of the material to achieve multi-point synchronous injection.

[0032] Specifically, after the material enters the receiving cavity 9 through the inlet 2, it forms a stable flow within the sealed space. The receiving cavity 9 homogenizes the pressure of the material, eliminating pressure surges caused by the inlet impact. The array of injection holes 11 disperses the material into multiple fine streams, which are simultaneously injected into the filling unit. Because the injection holes 11 are evenly distributed, the local pressure differences at each injection point are effectively balanced, avoiding pressure concentration caused by single-point injection. The material flow path forms a straight channel from the inlet 2 to the injection holes 11, reducing turbulence caused by bends. The injection section 1 is directly connected to the filling unit, shortening the time the material is exposed to the open environment and reducing the risk of air bubble contamination.

[0033] Compared to existing technologies, traditional filling mechanisms employ single-point injection and lack pressure buffering structures, making the material susceptible to external interference during long-distance transport. This invention achieves pressure buffering through the receiving cavity 9, and, in conjunction with the multiple injection holes 11, balances the pressure distribution, effectively suppressing turbulence. The closed-loop flow path design prevents the material from contacting air, fundamentally reducing conditions for bubble formation.

[0034] Through the above technical solution, this utility model achieves high-precision filling of easily foaming products. The sealed receiving cavity 9 ensures that the material flows under stable pressure, the array of multiple injection holes 11 eliminates local pressure differences, and the linear flow path reduces turbulence intensity. The direct connection between the injection section 1 and the filling unit shortens the material transmission distance and reduces the chance of air bubbles being mixed in. This solution significantly improves filling accuracy and process stability while maintaining a simple structure.

[0035] In some embodiments of this utility model, such as Figure 1 As shown, the main body 3 is provided with a through hole 32, which is located at the end of the main body 3 away from the liquid injection part 1, and the through hole 32 communicates with the receiving cavity 9.

[0036] The through hole 32 refers to a channel structure that penetrates the far end of the main body 3 and connects to the receiving cavity 9. Specifically, it can be formed by drilling or casting. The position and size of the through hole 32 are configured to guide the material to enter the receiving cavity 9 smoothly from the far end of the main body 3, avoiding turbulence caused by abrupt changes in the flow path.

[0037] Specifically, when the material enters the receiving cavity 9 through the through hole 32, since the through hole 32 is located at the end of the main body 3 away from the injection section 1, the flow direction of the material is adjusted to extend axially along the main body 3, thereby lengthening the flow path and reducing the risk of sudden changes in flow rate. The communication between the through hole 32 and the receiving cavity 9 allows the material to form a uniform initial flow state before entering the cavity, reducing the mixing of air bubbles caused by local pressure fluctuations or eddies. By optimizing the position and communication method of the through hole 32, the distribution of the material in the receiving cavity 9 is more uniform, providing a stable pressure environment for subsequent precise injection into the filling unit through the injection hole 11.

[0038] Compared to existing technologies, traditional filling mechanisms typically rely on complex buffer structures or diversion devices to stabilize material flow, but these structures can increase flow resistance and cause pressure fluctuations. This invention, through the axial positioning design of a single through-hole 32, simplifies the structure while achieving a smooth transition in the flow path, avoiding the turbulence problems caused by multi-stage diversion or path bends in traditional solutions.

[0039] Through the above technical solution, this utility model can ensure that the material maintains a stable flow state when entering the receiving cavity 9, effectively reducing the probability of bubble formation, thereby improving the filling accuracy of easily foaming products in the blow-fill-seal equipment.

[0040] In some embodiments of this utility model, such as Figure 2 , Figure 3 As shown, the main body 3 is also provided with a volume groove 33. The volume groove 33 is located near the through hole 32 and at the end of the through hole 32 away from the liquid injection part 1. The through hole 32 is connected to the volume groove 33.

[0041] The volumetric groove 33 refers to a recessed structure disposed inside the main body 3 and communicating with the through hole 32. Specifically, it can be implemented using a cylindrical or rectangular cross-section cavity structure, and its volume can be adjusted according to the material flow characteristics. This groove is formed by machining or casting, and the preferred material is stainless steel or a corrosion-resistant alloy. The axial position of the volumetric groove 33 is located at the end of the through hole 32 away from the injection section 1, forming an extension of the material flow path.

[0042] The end of the through hole 32 furthest from the injection section 1 refers to the end region where the outlet direction of the through hole 32 extends in the opposite direction to the plane of the injection section 1. Specifically, this can be achieved by setting a stepped hole structure inside the main body 3. This positional design ensures that the material must pass through the buffering effect of the volumetric groove 33 before entering the injection section 1.

[0043] Specifically, after the material enters the main body 3 through the inlet 2, it flows sequentially through the through-hole 32 and the volumetric trough 33. When the material passes through the through-hole 32, its flow cross-sectional area suddenly expands into the cavity space of the volumetric trough 33, and the flow velocity decreases due to the expansion of space. The cavity structure of the volumetric trough 33 allows the material to form a stable laminar flow state before entering the injection hole 11, and turbulent kinetic energy is absorbed by the inner wall of the cavity. When the material flows through the volumetric trough 33, pressure fluctuations are attenuated by the buffering effect of the cavity volume, and the flow velocity variation is reduced to within the threshold range allowed by the injection hole 11. In this process, the volumetric trough 33 acts as a fluid resistance adjustment unit, eliminating fluid separation caused by sudden pressure changes by changing the cross-sectional area and direction of the flow path.

[0044] Compared to existing technologies, traditional filling mechanisms lack buffer structures in the material conveying channel, making it easy for eddies to form when the material directly enters the injection hole 11 through the through hole 32. Existing technologies regulate flow rate by adding damping plates or throttle valves to the pipeline, but this cannot solve the cavitation effect caused by sudden local pressure changes. The volumetric trough 33 of this invention forms a continuously varying flow cross-section through spatial expansion, allowing the kinetic energy of the material to be smoothly converted into static pressure energy, achieving stable flow rate without additional flow obstruction elements.

[0045] Through the above technical solution, this utility model effectively suppresses pressure fluctuations in the material during the conveying process and eliminates turbulence and cavitation caused by high-speed flow. After the material dissipates kinetic energy in the volumetric tank 33, it enters the array of injection holes 11 at a uniform flow rate, avoiding deviations in injection volume caused by differences in flow rate.

[0046] In some embodiments of this utility model, such as Figure 2 , Figure 3 As shown, the main body 3 is also provided with a throttling hole 31, which is located close to the volume groove 33 and is connected to the volume groove 33.

[0047] The throttling orifice 31 refers to a fluid channel with a predetermined diameter located inside the main body 3. Specifically, it can be a circular channel formed by machining. Its function is to create local resistance by limiting the cross-sectional area of ​​the fluid. The volumetric groove 33 refers to a cavity structure located inside the main body 3. Specifically, it can be a groove with a depth of 3-8 mm formed by milling. Its function is to provide buffer space for the fluid and, in conjunction with the throttling orifice 31, to form secondary pressure regulation.

[0048] Specifically, when the material enters the volumetric tank 33 from the inlet 2, the fluid achieves initial pressure equilibrium within the tank. The material then needs to flow through the throttling orifice 31 to enter the downstream channel. At this point, the local resistance generated by the throttling orifice 31 and the buffering effect of the volumetric tank 33 work synergistically. When pressure fluctuations occur during filling, the change in fluid volume within the volumetric tank 33 is offset by the flow-limiting effect of the throttling orifice 31, ensuring a stable flow rate for the fluid flowing through the injection hole 11. This process actively controls the fluid kinetic energy through physical structure, avoiding turbulence caused by sudden changes in flow rate, thereby reducing the generation of bubbles in easily foaming products during filling.

[0049] Compared with existing technologies, traditional blow-fill-seal equipment usually relies on adjusting pump pressure or extending the flow channel length to achieve flow rate control, but this can easily lead to system response lag or structural complexity. This invention directly sets the throttling orifice 31 at the outlet end of the volumetric trough 33, and utilizes its spatial relationship with the volumetric trough 33 to form a series pressure regulation structure, which can achieve stable flow rate without adding external control components, while maintaining the overall compactness of the filling mechanism.

[0050] Through the above technical solution, this utility model effectively suppresses the flow rate instability caused by pressure fluctuations during the filling process of easily foaming products. By reducing the fluid kinetic energy through physical flow restriction, the probability of turbulence is reduced, allowing the material to be injected into the filling unit in a stable laminar flow state, ultimately achieving a significant improvement in filling accuracy.

[0051] In some embodiments of this utility model, such as Figures 1-3 As shown, it also includes a first connector 4, which is detachably mounted on the main body 3. The first connector 4 is located near the throttling orifice 31 and has a first inner hole (not marked in the figure). The first inner hole connects the through hole 32, the volume groove 33 and the throttling orifice 31.

[0052] The first connector 4 refers to a connecting component with an integrated flow channel, which can be detachably installed using a threaded or snap-fit ​​structure, and has a through channel machined inside. This component connects to the main body 3 through a standardized interface, realizing a modular design of the fluid channel.

[0053] The first inner hole refers to the axial channel structure penetrating the first connector 4, which can be implemented using a stepped hole or a straight hole structure to form a continuous flow channel connecting the through hole 32, the volume groove 33, and the throttling hole 31. This design replaces the traditional distributed pipe connection method.

[0054] The detachable installation refers to the separation of components through mechanical connections, specifically using flange connections or quick-release clamp structures. This feature allows the area where the throttling orifice 31 is located to be independently disassembled and maintained.

[0055] Specifically, the first connector 4 is fixed to the throttling orifice 31 area of ​​the main body 3 via a mechanical connection structure. The first inner hole inside the connector forms a through channel, integrating the through hole 32, the volumetric groove 33, and the throttling orifice 31, which originally required multiple independent pipe connections, into a single flow channel. During fluid transport, the material sequentially enters the first inner hole through the through hole 32, is buffered by the volumetric groove 33, and then passes through the throttling orifice 31 to achieve flow control. When cleaning or replacing the throttling orifice 31 component is required, only the first connector 4 needs to be disassembled to expose the relevant area, avoiding disturbance to the overall structure of the main body 3. This integrated flow channel design eliminates the accumulated assembly errors caused by traditional multi-section pipe connections, while also reducing the number of sealing surfaces and lowering the risk of leakage.

[0056] Compared to existing technologies, traditional filling mechanisms use separate pipes to connect the through-hole 32, the volume groove 33, and the throttling orifice 31, requiring multiple sealing interfaces and resulting in complex flow path routing. This invention integrates the three flow paths into a single component through the integrated flow path design of the first connector 4, reducing assembly steps and the number of sealing points. Existing technologies require disassembling the entire flow path system for maintenance, while this invention enables partial maintenance through a detachable connector, avoiding repeated calibration of the filling unit.

[0057] Through the above technical solution, this utility model solves the problems of leakage risk and maintenance difficulties caused by the complex structure of the fluid channel. The integrated flow channel design integrates multiple functional sections into a single component, reducing the impact of assembly errors on filling accuracy. The detachable structure allows key control components such as the throttling orifice 31 to be maintained individually, reducing downtime and adapting to the process requirements of frequent cleaning and sterilization in blow-fill-seal equipment. The simplified flow channel structure effectively reduces the probability of bubble formation and improves the stability of the filling process for easily foaming products.

[0058] In some embodiments of this utility model, such as Figures 1-3 As shown, it also includes a diaphragm 7 and a pressure plate 6. The diaphragm 7 is configured as an elastic element and is installed in the volume groove 33. The pressure plate 6 is installed on the main body 3 and presses the diaphragm 7 into the volume groove 33.

[0059] The diaphragm 7 refers to a sealing component made of an elastic material, specifically silicone or rubber, whose elastic deformation capability can absorb pressure fluctuations during material flow. The pressure plate 6 refers to a rigid fastener with mounting holes, specifically connected to the main body 3 by bolts, whose planar pressing action ensures that the edge of the diaphragm 7 forms a tight contact with the wall of the volumetric groove 33.

[0060] Specifically, the diaphragm 7 deforms under the pressure of the material within the volumetric groove 33. When the material pressure increases, the diaphragm 7 expands outward to buffer pressure peaks; when the pressure decreases, the diaphragm 7 retracts to compensate for pressure loss. The pressure plate 6 mechanically presses the diaphragm 7 to the bottom of the volumetric groove 33 to prevent displacement or loss of the sealing position under pressure fluctuations. This dynamic pressure regulation mechanism ensures a stable flow of the material through the volumetric groove 33, avoiding bubble formation caused by sudden pressure changes.

[0061] Compared with existing technologies, traditional filling mechanisms use a rigid cavity structure, which cannot eliminate the impact of pressure fluctuations on material flow and is prone to generating air bubbles during high-speed filling. This invention, through the combination of the elastic diaphragm 7 and the pressure plate 6, achieves real-time compensation for pressure fluctuations while maintaining sealing, thus solving the inherent defect of rigid structures being unable to adapt to pressure changes.

[0062] Through the above technical solution, this utility model effectively suppresses air bubbles generated by sudden pressure changes when the material flows in the volumetric trough 33, ensuring that the material enters the injection hole 11 in a stable flow state. The elastic deformation characteristics of the diaphragm 7 and the rigid constraint of the pressure plate 6 complement each other, maintaining the pressure balance inside the volumetric trough 33 during dynamic filling, thereby improving the filling accuracy of easily foaming products.

[0063] In some embodiments of this utility model, such as Figure 2 , Figure 3 As shown, the pressure plate 6 is provided with a control flow channel 61, one end of which leads to the diaphragm 7, and the other end of which connects to the external environment.

[0064] The control channel 61 refers to the gas conduction channel that runs through the interior of the pressure plate 6. Specifically, it can be implemented using a straight or stepped channel to establish a pressure transmission path between the pressure-bearing surface of the diaphragm 7 and the external environment. The external environment refers to the open area connected to the space where the filling mechanism is located. Specifically, it can be implemented using openings in the side wall of the pressure plate 6 or an interface structure connecting to external pipelines to provide a stable pressure reference.

[0065] Specifically, when the diaphragm 7 deforms due to pressure fluctuations in the material within the volumetric trough 33, the control channel 61 transmits external environmental pressure to the surface of the diaphragm 7 in real time. For example, when the material pressure increases, causing the diaphragm 7 to expand outward, the control channel 61 introduces atmospheric pressure into the pressure-bearing area of ​​the diaphragm 7, forming reverse pressure compensation; when the material pressure decreases, causing the diaphragm 7 to retract, the control channel 61 discharges the residual pressure accumulated on the surface of the diaphragm 7 to the external environment. This pressure balancing mechanism ensures that the diaphragm 7 is always in a dynamically stable pressure environment, eliminating material flow rate fluctuations caused by sudden pressure changes.

[0066] Compared with existing technologies, traditional filling mechanisms do not have a pressure balance channel, and the pressure difference on both sides of the diaphragm 7 changes continuously during the filling process, which can easily lead to excessive deformation of the elastic element or delayed rebound. This invention establishes a pressure compensation system through the control flow channel 61, so that the deformation of the diaphragm 7 always maintains a linear correspondence with the material pressure, for example, the pressure fluctuation can be controlled within ±5 kPa.

[0067] Through the above technical solution, this utility model effectively suppresses the unstable material spraying phenomenon caused by sudden pressure changes during the filling process, reduces the single filling volume error of easily foaming products, and avoids the problem of false increase in filling volume caused by air bubbles, thus realizing continuous high-precision filling operation of blow-fill-seal equipment.

[0068] In some embodiments of this utility model, such as Figures 1-3 As shown, it also includes a second connector 5, which is detachably mounted on the pressure plate 6. The second connector 5 has a second inner hole (not marked in the figure) that communicates with the control flow channel 61.

[0069] The second connector 5 refers to a connection component with a standardized interface, which can be implemented using a metal connector with threads or snaps, and is used to establish a detachable connection between the control channel 61 and external equipment.

[0070] The second inner hole refers to the channel structure that penetrates the interior of the connector. Specifically, it can be processed in the form of a stepped hole or a straight hole to form a continuous airflow path from the control flow channel 61 to the external environment.

[0071] Among them, detachable installation refers to the mechanical fixing between components through threaded connection or snap-fit, which can be achieved by flange connection or quick-connect joint structure, so as to facilitate quick disassembly and maintenance.

[0072] Specifically, after the second connector 5 is installed on the pressure plate 6, a standardized interface is formed at the end of the control flow channel 61. The second connector 5 is screwed into the preset mounting hole of the pressure plate 6, and the axis of its second inner hole is coaxial with the center line of the control flow channel 61. When an external air source device is connected to the second connector 5 via a quick plug, the second inner hole connects the control flow channel 61 to the air source pipeline. During the filling process, the air pressure signal is stably transmitted to the diaphragm 7 through the second inner hole, eliminating the risk of leakage caused by assembly deviations in traditional welded connections. When it is necessary to replace or clean the connector, the second connector 5 can be unscrewed directly without disassembling the entire pressure plate 6 assembly.

[0073] Compared to existing technologies, traditional filling mechanisms use a fixed welding method to connect the control channel 61 to the external pipeline, which has the drawback of requiring the entire component to be replaced when the seal fails. This invention, through a detachable connector design, allows for partial maintenance while ensuring the air circuit's sealing, avoiding production interruptions caused by equipment downtime. In existing technologies, the interface of the control channel 61 is mostly a non-standard structure; this invention uses a standardized connector to reduce parts management costs and improve the compatibility of the gas source equipment.

[0074] Through the above technical solution, this utility model solves the problem of filling accuracy fluctuation caused by unstable connection of the control channel 61, and ensures the stability of air pressure signal transmission through a standardized interface. The detachable structure simplifies the maintenance process of the sealing surface and reduces the incidence of filling errors caused by interface contamination. The optimized design of the internal channels of the connector reduces fluid turbulence, ensuring that the response speed of the diaphragm 7 maintains a linear relationship with air pressure changes, thereby improving the filling volume control accuracy.

[0075] In some embodiments of this utility model, such as Figure 2 , Figure 3 As shown, it also includes a solenoid valve 8, one end of which is connected to the second connector 5 and the solenoid valve 8 is in communication with the second connector 5, and the other end of the solenoid valve 8 is connected to a gas source.

[0076] The solenoid valve 8 is an actuator that controls the flow of gas via an electrical signal. Specifically, it can be a two-position three-way solenoid valve 8. When energized, it connects the gas source to the gas path of the second connector 5; when de-energized, it disconnects the gas path. The second connector 5 is a connecting component with an inner hole, which can be a stainless steel threaded connector. Its inner hole serves as a transition channel between the gas source and the control flow channel 61. The gas source is a device that provides compressed gas, which can be an air compressor or an air tank. Its output pressure range can be adapted to the deformation adjustment requirements of the diaphragm 7.

[0077] Specifically, after the solenoid valve 8 forms an air circuit connection with the second connector 5, the opening and closing state of the solenoid valve 8 is controlled by an electrical signal. When the solenoid valve 8 is open, the compressed gas output from the air source flows sequentially through the solenoid valve 8, the inner hole of the second connector 5, and the control flow channel 61 of the pressure plate 6, finally acting on the surface of the diaphragm 7 in the volumetric groove 33. The diaphragm 7 deforms under pressure, changing the effective volume of the volumetric groove 33, thereby regulating the material flow rate. When the solenoid valve 8 is closed, the air circuit is cut off, and the diaphragm 7 recovers its initial shape through its own elasticity. The rapid response characteristic of the solenoid valve 8 allows the air pressure regulation process to move synchronously with the filling rhythm, avoiding pressure fluctuations caused by response delays in traditional mechanical regulation methods.

[0078] Compared with existing technologies, current filling mechanisms mostly use manual valves or fixed throttling devices to regulate air pressure. The adjustment accuracy is limited by the operator's experience and cannot achieve dynamic control. However, this utility model automates and digitizes the air pressure regulation process through the linkage control of the solenoid valve 8 and the air source. It compensates for pressure fluctuations in real time during the filling process and eliminates filling volume deviations caused by air bubbles.

[0079] Through the above technical solution, this utility model can accurately control the deformation and action time of the diaphragm 7, so that the volume change of the volumetric trough 33 is dynamically matched with the filling requirements. During the filling process of easily foaming products, the rapid opening and closing of the solenoid valve 8 suppresses sudden pressure changes, avoids the formation of air bubbles inside the material, ensures that the filling volume error is controlled within the allowable range of the process, and maintains the continuous production rhythm of the blow-fill-seal equipment.

[0080] In some embodiments of this utility model, a control system is also included, which is electrically or communicatively connected to the solenoid valve 8.

[0081] The control system refers to an electronic device used to perform logical operations and data processing. Specifically, it can be implemented using a programmable logic controller or a microcontroller, which precisely controls the opening and closing sequence of the solenoid valve 8 through a preset program.

[0082] Electrical connection refers to the connection method of transmitting electrical signals through physical lines, which can be implemented using shielded cables or printed circuit boards, and is used to directly drive the action of the solenoid valve 8 actuator.

[0083] The communication connection refers to a protocol-based data transmission method, which can be implemented using industrial Ethernet or fieldbus protocols, and is used to remotely transmit control commands to the solenoid valve 8.

[0084] The solenoid valve 8 refers to an actuator that controls the flow of fluid through electromagnetic force. Specifically, it can be implemented using a two-position three-way solenoid valve 8, which is used to regulate the gas pressure entering the volumetric tank 33.

[0085] Specifically, the control system directly sends pulse signals to the solenoid valve 8 via electrical connection or transmits digital control commands via communication connection to drive the solenoid valve 8 to switch the gas supply on / off state according to a preset timing sequence. When the injection unit enters the liquid injection stage, the control system outputs an opening signal to open the solenoid valve 8. Compressed gas enters the control flow channel 61 through the second connector 5, pushing the diaphragm 7 to deform and causing the material to flow out stably from the injection hole 11. At the end of the liquid injection cycle, the control system immediately cuts off the gas supply to the solenoid valve 8, and the diaphragm 7 resets under the action of elastic restoring force, blocking the flow of the material. For easily foaming liquids, the control system can be set to a high-frequency pulse mode to perform multiple millisecond-level opening and closing operations within a single liquid injection cycle, reducing fluid shear force through intermittent liquid injection, thereby suppressing bubble formation.

[0086] Compared to existing technologies, traditional blow-fill-seal equipment relies on a fixed air pressure value for filling and cannot dynamically adjust the injection pressure according to the characteristics of the liquid. Existing technologies often use simple timing circuits to control the solenoid valve 8, lacking real-time synchronization with the filling action. This invention uses a closed-loop control system to match the mechanical movement rhythm of the filling unit in real time, maintaining a constant material flow rate during the deformation of the diaphragm 7, thus eliminating injection volume deviations caused by air pressure fluctuations.

[0087] Through the above technical solution, this utility model achieves dynamic pressure regulation during the filling process of easily foaming liquids, effectively suppressing bubble generation while ensuring the repeatability accuracy of the injected volume in each injection cycle. By precisely synchronizing the programmable control logic with the actions of the filling unit, the need for manual intervention is reduced, and the filling stability of the blow-fill-seal equipment under complex working conditions is improved.

[0088] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A high-precision filling mechanism, characterized by, include: The system comprises a main body and an injection section. The injection section is mounted on the main body and is sealed to the main body. A receiving cavity is formed between the injection section and the main body. An inlet is provided at one end of the main body away from the injection section. The injection section has a plurality of injection holes arranged in a row, which communicate with the receiving cavity. The injection section is connected to a filling unit. The material enters the receiving cavity through the inlet and is precisely injected into the filling unit through the injection holes.

2. The high precision filling mechanism of claim 1, wherein The main body is provided with a through hole, which is located at the end of the main body away from the liquid injection part and is connected to the receiving cavity.

3. The high precision filling mechanism of claim 2, wherein The main body is also provided with a volume groove, which is located near the through hole and at the end of the through hole away from the liquid injection part, and the through hole is connected to the volume groove.

4. The high precision filling mechanism of claim 3, wherein The main body is also provided with a throttling hole, which is located close to the volume groove and is connected to the volume groove.

5. The high precision filling mechanism of claim 4, wherein It also includes a first connector, which is detachably mounted on the main body. The first connector is located near the throttling orifice and has a first inner hole that connects the through hole, the volume groove and the throttling orifice.

6. The high precision filling mechanism of claim 3, wherein It also includes a diaphragm and a pressure plate. The diaphragm is configured as an elastic element and is installed in the volume groove. The pressure plate is installed on the main body and presses the diaphragm into the volume groove.

7. The high precision filling mechanism of claim 6, wherein The pressure plate is provided with a control flow channel, one end of which leads to the diaphragm and the other end of which connects to the external environment.

8. The high precision filling mechanism of claim 7, wherein It also includes a second connector, which is detachably mounted on the pressure plate. The second connector has a second inner hole that communicates with the control flow channel.

9. The high precision filling mechanism of claim 8, wherein, It also includes a solenoid valve, one end of which is connected to the second connector and the solenoid valve is in communication with the second connector, and the other end of which is connected to a gas source.

10. The high precision filling mechanism of claim 9, wherein It also includes a control system, which is electrically or communicatively connected to the solenoid valve.

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