Liquid material discharge device

Abstract

The application relates to the technical field of fluid control, in particular to a liquid material discharging device which comprises a gas source interface, a first on-off valve, a positive pressure gas path, a negative pressure gas path, a glue coating valve and an exhaust valve, the gas inlet ends of the positive pressure gas path and the negative pressure gas path are connected with the gas source interface through the first on-off valve, the pipeline diameter connected with the first on-off valve of the gas source interface is larger than the pipeline diameter of the positive pressure gas path and / or the pipeline diameter of the negative pressure gas path, an outlet end of the glue coating valve is used as a glue coating port, and the outlet end of the glue coating valve is further provided with a branch connected with the exhaust valve. The first on-off valve is arranged between the gas source interface and each branch interface, the opening and closing control of the compressed gas source is more convenient, the consumption of compressed air is saved, the flexibility and accuracy of the gas supply are ensured, the response speed of each branch is improved through optimization of each branch, and the problem of uneven discharging caused by pressure fluctuation of the compressed gas is solved.

Description

Technical Field

[0001] This application relates, and particularly relates to, a liquid material dispensing device. Background Technology

[0002] In the field of liquid material distribution, the method of quantitatively dispensing liquid material from storage containers using compressed gas is often adopted for control. Among these methods, ensuring that the compressed gas used for dispensing liquid material reaches a certain pressure is crucial for precise control and efficient utilization of liquid material.

[0003] In the prior art, the outlet of the internal pressure reducing valve of the dispensing control device is connected to the inlet of the glue applicator. When the dispensing control device dispenses glue, the inlet and outlet of the glue applicator are connected, and the air pressure at the outlet of the pressure reducing valve drops sharply. The pressure reducing valve then replenishes the air pressure until it matches the set air pressure. Furthermore, the excessively long air pressure adjustment time during this process prevents the dispensing controller from achieving rapid and repeated dispensing. In systems that use pressure control valves (such as regulators or pressure relief valves) to supply air from a compressed gas source to a container storing liquid materials at a constant pressure, the short and potentially frequent dispensing action of the dispenser necessitates continuous adjustment of the secondary pressure to the set value. This process involves repeated vibrations in the supply and discharge of compressed gas. When these actions occur within short time intervals or when the load capacity is relatively small compared to the air supply flow rate, significant pressure fluctuations can occur. These fluctuations not only affect the accuracy of the dispensing volume but may also cause temporary drops or rises in the secondary pressure when the dispenser begins and ends its dispensing action. In continuous dispensing operations, these pressure changes may combine in complex patterns, leading to deviations between the actual dispensing volume and the expected value.

[0004] Therefore, in applications that require high-precision liquid material distribution, how to effectively manage these pressure variations has become an urgent problem to be solved. Utility Model Content

[0005] The purpose of this application is to provide a liquid material dispensing device to solve the problem of uneven liquid dispensing caused by pressure fluctuations of compressed gas in the prior art.

[0006] The embodiments of this application can be implemented through the following technical solutions:

[0007] A liquid material dispensing device, comprising:

[0008] The system includes an air source interface, a first on / off valve, a positive pressure air path, a negative pressure air path, a glue-applying valve, and an exhaust valve. The air inlets of the positive pressure air path and the negative pressure air path are respectively connected to the air source interface through the first on / off valve. The air outlet of the positive pressure air path is connected to the air inlet of the glue-applying valve. The vacuum generating end of the negative pressure air path is connected to the exhaust end of the glue-applying valve. One outlet end of the glue-applying valve serves as a glue-applying port, and the outlet end of the glue-applying valve is also provided with a branch connected to the exhaust valve.

[0009] The diameter of the pipeline connecting the gas source interface to the first on / off valve is greater than the diameter of the positive pressure gas pipeline and / or greater than the diameter of the negative pressure gas pipeline.

[0010] Furthermore, the flow rate of the exhaust valve is set to be greater than that of the glue-applying valve, and in the branch connecting the exhaust valve and the glue-applying valve, the diameter of the exhaust valve outlet pipe is greater than the diameter of the exhaust valve inlet pipe.

[0011] Furthermore, the positive pressure air circuit includes a first proportional valve and an air tank. One end of the first proportional valve is connected to the first on / off valve, and the other end is connected to the adhesive applicator valve through the air tank.

[0012] Furthermore, a first sensor is provided between the first on / off valve and the first proportional valve.

[0013] Furthermore, a pressure relief gas path is connected to the positive pressure gas path. The pressure relief gas path is connected between the first proportional valve and the gas tank. The pressure relief gas path includes a second on / off valve and a first throttle valve. One end of the second on / off valve is connected to the first throttle valve, and the other end is connected to atmospheric pressure.

[0014] Furthermore, the negative pressure air circuit includes a pressure reducing valve, a second proportional valve, a second throttle valve, and a vacuum generator. One end of the second proportional valve is connected to the first on / off valve through the pressure reducing valve, and the other end is connected to one end of the vacuum generator through the second throttle valve. The vacuum generating end of the vacuum generator is connected to the glue-applying valve, and the other end is connected to the atmosphere as a vacuum exhaust port.

[0015] Furthermore, the diameter of the pipe connecting the vacuum generator to the vacuum exhaust port is larger than the diameter of the pipe connecting the vacuum generator to the glue-applying valve.

[0016] Furthermore, a second sensor is provided between the vacuum generator and the glue-applying valve.

[0017] Furthermore, a third sensor is provided between the glue-applying valve and the glue-applying port.

[0018] Furthermore, an ambient air pressure sensor is also provided, which is connected to the atmospheric environment and is configured to measure the absolute or relative air pressure of the open environment. The ambient air pressure sensor is installed on the control module.

[0019] The liquid material dispensing device provided in the embodiments of this application has at least the following beneficial effects:

[0020] This application makes the opening and closing control of the compressed air source more convenient by setting the first on / off valve between the air source interface and each branch interface, saving compressed air consumption and ensuring the flexibility and accuracy of gas supply. On this basis, through the optimization of each branch, including the design of the diameter change between pipelines, the addition of controllable pressure relief branches, and the optimization of exhaust valve branches, not only is the response speed of each branch improved, but the problem of uneven discharge caused by the pressure change of compressed gas is also solved. It has the advantages of uniform and precise control of liquid discharge and strong practicality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the gas path structure of a liquid material dispensing device according to this application.

[0022] Numbers in the diagram

[0023] 2-First on / off valve; 5-Glue application valve; 6-Exhaust valve; 11-Gas source interface; 12-Exhaust port; 13-Glue application port; 14-Vacuum exhaust port; 31-First proportional valve; 32-Gas tank; 41-Pressure reducing valve; 42-Second proportional valve; 43-Second throttle valve; 44-Vacuum generator; 61-Second on / off valve; 62-First throttle valve; 71-First sensor; 72-Second sensor; 73-Third sensor; 74-Ambient air pressure sensor. Detailed Implementation

[0024] The present application will now be further described based on preferred embodiments and with reference to the accompanying drawings.

[0025] In addition, for ease of understanding, various components on the drawings have been enlarged (thickened) or reduced (thinned), but this is not intended to limit the scope of protection of this application.

[0026] Singular forms of words also include plural meanings, and vice versa.

[0027] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, in the description of this application, in order to distinguish different units, the terms "first," "second," etc. are used in this specification, but these are not limited by the manufacturing order, nor should they be construed as indicating or implying relative importance. Their names may differ in the detailed description and claims of this application.

[0028] The vocabulary used in this specification is for illustrative purposes and is not intended to limit the scope of this application. It should also be noted that, unless otherwise expressly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection via an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of these terms in this application.

[0029] like Figure 1 As shown, a liquid material dispensing device includes an air source interface 11, a first on / off valve 2, a positive pressure air path, a negative pressure air path, an adhesive application valve 5, and an exhaust valve 6. The air inlets of the positive pressure air path and the negative pressure air path are respectively connected to the air source interface 11 through the first on / off valve 2. The first on / off valve 2 is located inside the dispensing device body, which makes the opening and closing control of the compressed air source more convenient, saves the consumption of compressed air, and ensures the flexibility and accuracy of gas supply.

[0030] In some preferred embodiments, the diameter of the pipe connecting the gas source interface 11 to the first on / off valve 2 is larger than the diameter of the positive pressure gas path and / or larger than the diameter of the negative pressure gas path. The larger pipe diameter design at the gas source interface 11 can effectively reduce gas flow resistance, ensure stable and efficient gas delivery to the positive pressure gas path, and shorten the response time of each valve in the positive pressure gas path.

[0031] Furthermore, the outlet end of the positive pressure air path is connected to the inlet end of the glue dispensing valve 5, and the vacuum generating end of the negative pressure air path is connected to the exhaust end of the glue dispensing valve 5. One outlet end of the glue dispensing valve 5 serves as the glue dispensing port 13, which is connected to the glue bucket for dispensing. The outlet end of the glue dispensing valve 5 is also provided with a branch connected to the exhaust valve 6. One end of the exhaust valve is connected to the atmosphere as the exhaust port 12. The exhaust port 12 is used to enable the exhaust valve 6 to promptly discharge the gas inside the glue dispensing valve 5, maintain stable pressure, effectively prevent glue dripping, remove air bubbles, maintain stable pressure, and facilitate equipment maintenance, thereby improving glue dispensing quality and production efficiency.

[0032] In some preferred embodiments, the flow rate of the exhaust valve 6 is set to be greater than that of the glue dispensing valve 5, and in the branch connecting the exhaust valve 6 and the glue dispensing valve 5, the diameter of the outlet pipe of the exhaust valve 6 is greater than the diameter of the inlet pipe of the exhaust valve 6, thereby promoting faster gas discharge from the outlet end of the exhaust valve 6, avoiding gas accumulation in the pipe, and effectively reducing the impact of accumulated air bubbles in the pipe on the dispensing effect. Through the above pipe diameter variation design, it helps to improve exhaust efficiency and optimize the dispensing effect, and improve the stability and reliability of the dispensing machine.

[0033] In some preferred embodiments, since the pressure rise at the glue application port 13 of the glue application valve 5 will cause a short-term air pressure oscillation at the moment of startup, the applicant has also optimized the positive pressure air path.

[0034] Specifically, the positive pressure air circuit includes a first proportional valve 31 and an air tank 32. One end of the first proportional valve 31 is connected to the first on / off valve 2, and the other end is connected to the adhesive application valve 5 through the air tank 32. When the first on / off valve 2 opens the positive pressure air circuit, compressed gas is introduced from the air source interface 11, passes through the first on / off valve 2 to the first proportional valve 31, and is adjusted to the desired pressure in the first proportional valve 31. Then, it is piped from the output port of the first proportional valve 31 to the air tank 32 and then to the adhesive application valve 5. The air tank 32 can effectively reduce the pressure drop at the moment the adhesive application port 13 is opened. The adhesive application valve 5 is controlled by the control system to ensure the connection time of its input and output ports, or the pressure adjusted by the first proportional valve 31, etc., and can adjust the amount of liquid material discharged from its adhesive application port 13.

[0035] In some preferred embodiments, to enable the first proportional valve 31 to quickly reach the working air pressure value, a pressure relief air path is connected to the positive pressure air path. The pressure relief air path is connected between the first proportional valve 31 and the air tank 32. The pressure relief air path includes a second on / off valve 61 and a first throttle valve 62. One end of the second on / off valve 61 is connected to the first throttle valve 62, and the other end is connected to atmospheric pressure. This ensures that when the second on / off valve 61 is open, the pressure on the secondary side of the first proportional valve 31 is always lower than the set value, thereby causing the first proportional valve 31 to perform an action to increase the pressure value during operation. The first throttle valve 62 controls the flow rate by adjusting the size of the fluid channel, realizing the functions of speed regulation and pressure reduction, and improving the accuracy of speed regulation and pressure reduction. This allows the positive pressure air path to quickly reach the working air pressure value before the glue application action occurs, improving the working response time.

[0036] In some preferred embodiments, after the dispensing is completed, there will be residual pressure between the dispensing valve 5 and the glue bucket that cannot be released at the moment the dispensing valve 5 closes. In order to prevent glue from dripping at the dispensing port 13, an exhaust pipe and a negative pressure back suction air path are set up where the exhaust valve 6 is located. The applicant has optimized the negative pressure air path.

[0037] Specifically, the negative pressure air circuit includes a pressure reducing valve 41, a second proportional valve 42, a second throttle valve 43, and a vacuum generator 44. One end of the second proportional valve 42 is connected to the first on / off valve 2 through the pressure reducing valve 41, and the other end is connected to one end of the vacuum generator 44 through the second throttle valve 43. The vacuum generating end of the vacuum generator 44 is connected to the glue-applying valve 5, and the other end is connected to the atmosphere as a vacuum exhaust port 14. The components cooperate with each other to be responsible for on / off control, pressure reduction and stabilization, flow / pressure ratio adjustment, flow regulation, and negative pressure generation, respectively, realizing efficient, accurate, and stable fluid control and negative pressure environment generation.

[0038] In some preferred embodiments, the diameter of the pipe connecting the vacuum generator 44 to the vacuum exhaust port 14 is larger than the diameter of the pipe connecting the vacuum generator 44 to the glue applicator 5. By increasing the pipe diameter at the vacuum exhaust port 14, exhaust resistance can be effectively reduced, exhaust efficiency can be improved, and the vacuum generator 44 can respond quickly, effectively reducing the occurrence of glue dripping.

[0039] In some preferred embodiments, this application also provides sensors for multiple branches, namely a first sensor 71, a second sensor 72, and a third sensor 73. The first sensor 71 is located between the first on / off valve 2 and the first proportional valve 31 to detect the pressure of the compressed air source in the positive pressure air path, so as to provide feedback to the control system. The control system then adjusts the first proportional valve according to the measured air pressure value.

[0040] In some preferred embodiments, the second sensor 72 is disposed between the vacuum generator 44 and the glue-applying valve 5 to collect the real-time air pressure in the negative pressure air path, extract the air pressure characteristic parameters of the negative pressure air path and feed them back to the control system, and the control system then adjusts the second proportional valve according to the obtained parameter characteristics.

[0041] In some preferred embodiments, the third sensor 73 is disposed between the glue dispensing valve 5 and the glue dispensing port 13 to collect the real-time air pressure in the positive pressure air path and feed it back to the control system. The control system controls the glue dispensing amount based on the feedback data and monitors the remaining amount of glue in the storage container.

[0042] In some preferred embodiments, this application further includes an ambient air pressure sensor 74, which is connected to the atmospheric environment. The ambient air pressure sensor 74 is configured to measure the absolute or relative air pressure of the open environment. The ambient air pressure sensor 74 is mounted on the control module and is used to correct the measured values ​​of the third sensor 73 to compensate for the problem that changes in atmospheric environmental factors such as ambient temperature, humidity, and vibration can cause fluctuations in the collected data, resulting in unreliable data.

[0043] The specific embodiments of this application have been described in detail above. For those skilled in the art, several improvements and modifications can be made to this application without departing from the principle of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A liquid material dispensing device, characterized in that, include: The gas source interface (11), the first on / off valve (2), the positive pressure gas path, the negative pressure gas path, the glue application valve (5) and the exhaust valve (6) are provided. The air inlet of the positive pressure gas path and the negative pressure gas path are respectively connected to the gas source interface (11) through the first on / off valve (2). The air outlet of the positive pressure gas path is connected to the air inlet of the glue application valve (5). The vacuum generating end of the negative pressure gas path is connected to the exhaust end of the glue application valve (5). One outlet end of the glue application valve (5) serves as the glue application port (13). The outlet end of the glue application valve (5) is also provided with a branch connected to the exhaust valve (6). The diameter of the pipe connecting the gas source interface (11) to the first on / off valve (2) is greater than the diameter of the positive pressure gas path and / or greater than the diameter of the negative pressure gas path.

2. The liquid material dispensing device according to claim 1, characterized in that: The flow rate of the exhaust valve (6) is set to be greater than that of the glue-applying valve (5), and in the branch connecting the exhaust valve (6) and the glue-applying valve (5), the diameter of the exhaust valve (6) outlet pipe is greater than the diameter of the exhaust valve (6) inlet pipe.

3. The liquid material dispensing device according to claim 1, characterized in that: The positive pressure air circuit includes a first proportional valve (31) and an air tank (32). One end of the first proportional valve (31) is connected to the first on / off valve (2), and the other end is connected to the glue-applying valve (5) through the air tank (32).

4. The liquid material dispensing device according to claim 3, characterized in that: A first sensor (71) is provided between the first on / off valve (2) and the first proportional valve (31).

5. The liquid material dispensing device according to claim 4, characterized in that: The positive pressure air line is connected to a pressure relief air line, which is connected between the first proportional valve (31) and the air tank (32). The pressure relief air line includes a second on / off valve (61) and a first throttle valve (62). One end of the second on / off valve (61) is connected to the first throttle valve (62), and the other end is connected to atmospheric pressure.

6. The liquid material dispensing device according to claim 1, characterized in that: The negative pressure air circuit includes a pressure reducing valve (41), a second proportional valve (42), a second throttle valve (43), and a vacuum generator (44). One end of the second proportional valve (42) is connected to the first on / off valve (2) through the pressure reducing valve (41), and the other end is connected to one end of the vacuum generator (44) through the second throttle valve (43). The vacuum generating end of the vacuum generator (44) is connected to the glue-applying valve (5), and the other end is connected to the atmosphere as a vacuum exhaust port (14).

7. The liquid material dispensing device according to claim 6, characterized in that: The diameter of the pipe connecting the vacuum generator (44) to the vacuum exhaust port (14) is greater than the diameter of the pipe connecting the vacuum generator (44) to the glue valve (5).

8. The liquid material dispensing device according to claim 6, characterized in that: A second sensor (72) is provided between the vacuum generator (44) and the glue-applying valve (5).

9. The liquid material dispensing device according to claim 1, characterized in that: A third sensor (73) is provided between the glue-applying valve (5) and the glue-applying port (13).

10. The liquid material dispensing device according to claim 1, characterized in that: An ambient air pressure sensor (74) is also provided. The ambient air pressure sensor (74) is connected to the atmospheric environment. The ambient air pressure sensor (74) is set to measure the absolute air pressure or relative air pressure of the open environment. The ambient air pressure sensor (74) is located on the control module.

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