KR102032065B1 - The constant amount dispenser device - Google Patents

Abstract

The present invention is a discharge device for discharging the liquid in the syringe through the gas supplied from the compressed gas source, characterized in that it comprises a flow rate adjusting means for adjusting the flow rate supplied to the syringe in accordance with the remaining liquid in the syringe.
As a result, the pressure wave delivered to the nozzle is different depending on the remaining solution of the syringe, which decreases with discharge, so that a constant pressure wave is transmitted to the nozzle even if the remaining solution changes. Discharge is implemented.
In addition, the discharge amount may be kept constant by increasing the opening area of the flow regulating means in proportion to the gradually increasing the space in the syringe by disposing repeatedly one or more flow rate regulating means on the pipe constituting the metered discharge device.

Description

Quantitative Discharge Device {THE CONSTANT AMOUNT DISPENSER DEVICE}

The present invention relates to a metered discharge device, and more particularly, to a dispenser capable of precisely metered discharge of liquid materials (resin, conductive adhesive, UV resin, various pastes) of various viscosities.

The pneumatic dispenser is configured by discharging the liquid in the syringe by applying pressure to the syringe in a predetermined time. The general dispenser controls the high pressure air introduced from the external gas source to the pressure specified by the two proportional control valves (regulators) and supplies it to the first pipe for discharging and the second pipe for liquid suction and anti-spill vacuum. It consists of a solenoid valve.

The solenoid valve normally opens the second pipe and operates for vacuum to prevent the liquid in the syringe from inhaling and spilling.When the discharge signal comes, it blocks the second pipe and opens the first pipe to discharge the liquid. Open the air to release the air, close the first pipe and open the second pipe again to maintain the vacuum.

When the above-described discharging process and the vacuum holding process are repeated, as shown in FIG. 1, the amount of discharge gradually decreases due to the filling time of the space as the liquid in the syringe decreases, thereby increasing the space in the syringe.

The prior art to solve this problem is to implement a metered discharge by increasing the pressure of the proportional control valve or the opening time of the solenoid valve.

However, the method of increasing the pressure of the proportional control valve has a problem in that the pulsation phenomenon becomes severe due to the characteristics of the air, thereby increasing the error rate. Also, if the response time to reach the desired pressure is delayed, the desired discharge amount cannot be matched. The method of quantitative discharging by increasing the stability was higher than the pressure control, but there was a problem that the discharge error ratio at the time of increasing the opening time was relatively high.

Republic of Korea Patent Publication No. 10-2017-0140117 (Liquid automatic metering discharge device) Republic of Korea Patent No. 10-0985754 (Photosensitive Liquid Quantitative Discharge Monitoring System)

The present invention was made to solve the above problems, and an object of the present invention is to provide an area (opening area) of a pipe in which a pressure wave transmitted to a nozzle is different depending on a residual solution of a syringe which decreases with discharge. It is to provide a fixed-quantity discharging device that can be controlled to deliver a constant pressure wave to the nozzle even if the remaining solution changes.

Still another object of the present invention is to arrange at least one flow rate adjusting means on a pipe constituting the metered discharge device so that the discharge is repeated to increase the opening area of the flow rate adjusting means in proportion to the gradually increasing space in the syringe so that the discharge amount is constant. It is to provide a fixed-quantity discharge device that can be maintained.

The above object is, according to the present invention, a discharge device for discharging a liquid in a syringe through a gas supplied from a compressed gas source, the quantitative amount comprising a flow control means for adjusting the flow rate supplied to the syringe in accordance with the remaining liquid in the syringe It can be achieved by the discharge device.

Here, the metered discharge device, the compressed gas source; An solenoid valve connected to the compressed gas source and configured to determine whether to supply gas at a pressure adjusted by the syringe; A first proportional control valve disposed on the discharge first pipe communicating the compressed gas source with the solenoid valve; A second proportional control valve disposed on a second pipe for vacuum in communication with the compressed gas source and the solenoid valve; A syringe for discharging the liquid filled therein through the gas supply of the solenoid valve; And a control unit controlling the compressed gas source, the solenoid valve, the first proportional control valve, and the second proportional control valve. It includes, The flow rate adjusting means is provided as a flow rate control device installed in the pipe constituting the metered discharge device.

In addition, the flow control device may include a flow control valve for varying the area of the pipe installed under the control of the controller.

In addition, the flow rate control device may be configured to further include a pulse scavenging device for preventing pulsation (surging) in the installed pipe.

On the other hand, the flow control valve may be arranged in plurality on the metered discharge device.

Here, the flow control valve may be provided on the pipe connecting the solenoid valve and the syringe to increase the area of the pipe supplied to the syringe so as to be inversely proportional to the remaining liquid in the syringe under the control of the controller. .

In addition, the flow control valve may be disposed on a first pipe connecting the first proportional control valve and the solenoid valve.

The flow rate control valve may be disposed on a second pipe connecting the second proportional control valve and the solenoid valve.

According to the present invention, the pressure wave transmitted to the nozzle is different depending on the remaining solution of the syringe which decreases with the discharge, so that the constant pressure wave is transmitted to the nozzle even if the residual solution changes by controlling the area (opening area) of the pipe. Thus, the metered discharge is realized.

In addition, the discharge amount may be kept constant by increasing the opening area of the flow regulating means in proportion to the gradually increasing the space in the syringe by disposing repeatedly one or more flow regulating means on the pipe constituting the metered discharge device.

1 is a schematic diagram showing a phenomenon in which the discharge amount is changed according to the remaining liquid in the syringe as the discharge is repeated,
2 is a block diagram of a metered discharge device according to the present invention,
3 is a configuration diagram showing another embodiment of the metered discharge device according to the present invention,
4 is a configuration diagram showing still another embodiment of the metered discharge device according to the present invention,
5 is a graph showing the correlation between the pressure wave and the pressure wave average value transmitted to the nozzle according to the opening area of the pipe in order to realize the quantitative discharge,
6 and 7 are graphs comparing the response pressures obtained when the opening area is changed according to the remaining amount of liquid in the syringe.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the present invention.

Prior to this, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, in the present specification, when one component is referred to as being “in communication with” or “connected” with another component, or the like, the one component may be in direct communication with or connected to the other component. It is to be understood that unless the substrate exists, it may be in communication or connected via another component in the middle.

That is, the terms used in the present specification and claims should not be construed in a dictionary meaning, and on the basis of the principle that the inventors may appropriately define the concept of terms in order to explain their invention in the best way. It should be interpreted as meanings and concepts corresponding to the technical spirit of the present invention.

Therefore, the configurations shown in the embodiments and drawings described herein are only preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, and various equivalents may be substituted for them at the time of the present application. It is to be understood that water and variations may exist.

Figure 2 is a block diagram of a metered discharge device according to the present invention, Figure 3 is a block diagram showing another embodiment of the metered discharge device according to the present invention, Figure 4 is another embodiment of a metered discharge device according to the present invention 5 is a graph showing the correlation between the pressure wave and the pressure wave average value delivered to the nozzle according to the opening area of the pipe in order to realize the quantitative discharge, and FIG. 6 and FIG. 7 show the residual amount of liquid in the syringe. This is a graph comparing the response pressure obtained when the opening area is changed.

2 to 4, the metered discharge device 100 according to the present invention includes a compressed gas source 10, a solenoid valve 20, first and second proportional control valves 30 and 40, and a syringe 50. ), The control unit 60 and the flow rate control device 70 configured as an embedded system. In addition, a pressure sensor (not shown) for detecting information of an input pressure and an output pressure is disposed at the front and rear ends of the flow regulating control device 70, the connection tube of the valve and the syringe 50, and the respective components and the control unit. Wiring for electrically connecting the 60 is provided.

Here, the compressed gas source 10 is a configuration for supplying the pressure gas into the metered discharge device 100, the solenoid valve 20 is connected to the compressed gas source 10 and adjusted by the syringe 50 It is configured to determine whether to supply the gas of the pressure, provided with a solenoid valve, opening and closing the solenoid valve in accordance with the electrical control signal transmitted from the control unit 60 to discharge state and vacuum state (not discharge state, leakage prevention) It serves to convert.

The first proportional control valve 30 is disposed on the discharge first pipe communicating the compressed gas source 10 and the solenoid valve 20, and the second proportional control valve 40 is the compressed gas source. (10) and the configuration disposed on the vacuum second pipe communicating with the solenoid valve 20, the working fluid can be supplied with a pressure to balance the total force from the nozzle of the syringe 50 to the outside It plays the role of making it work. That is, the first and second proportional control valves 30 and 40 operate under the control of the control unit 60 at the time of discharging and waiting, respectively, and the nozzles of the syringe 50 of the metered-discharge device 100 and the pipe interior. It is a configuration to maintain the controlled pressure of.

Syringe 50 is a configuration for discharging the liquid filled therein through the gas supply of the solenoid valve 20, the control unit 60 of each of the above-described configuration and flow rate control device 70 and exhaust valve to be described later Control the drive.

Here, the exhaust valve and the vacuum exhauster shown in FIGS. 2 to 4 apply a vacuum pressure to a pipe and a tube connected to the syringe 50 so that the solution inside the syringe 50 does not leak to the outside during standby (not discharged). To be prepared.

Flow control device 70 is a characteristic configuration of the present invention, is installed in the pipe constituting the metered discharge device 100, the remaining amount of liquid filled in the syringe 50 at the time of discharge by the input pressure and pressure application time Including a flow control valve 72 for adjusting the flow area of the supplied compressed air by adjusting the memory portion (not shown) and the area (opening degree) of the pipe, the characteristics of the pressure wave transmitted to the nozzle according to the change Can be configured.

Specifically, the flow rate control valve 72 controls the flow area of the pipe through which the compressed air flows through the flow rate control valve 72 as the residual solution decreases by discharging, i.e., by adjusting the flow rate flow area. By applying the pressure correction value of the uniform discharge can be implemented.

를 조절함에 따라 노즐에 전달되는 압력파가 다르게 나타나는 현상을 기반으로 설계되었다. 즉, 잔여용액과 평균압력의 관계는 같은 인가압력에서 잔여용액

가 증가할수록 평균압력 P_avg가 증가하고, 관의 개도율이 증가할수록 노즐에 전달되는 압력파의 평균압력이 증가하게 되는 유체역학적 특성을 가진다. 이러한 특성을 이용하여 잔여용액에 상관없이 노즐에서 일정한 평균압력을 구현할 수 있는 각각의 잔여용액에 따른 밸브 개도율 값

를 구현할 수 있도록 하는 입력값과 그에 따른 유량제어밸브(72)의 동작을 제어함으로써 정량 토출이 구현된다.The concept of the control of the flow area is as shown in Figs.

It is designed based on the phenomenon that the pressure wave delivered to the nozzle is different from each other. In other words, the relationship between the residual solution and the average pressure is the residual solution at the same applied pressure.

The average pressure P _avg increases as the value increases, and the average pressure of the pressure wave transmitted to the nozzle increases as the opening degree of the pipe increases. Using this characteristic, the valve opening rate value according to each remaining solution that can realize a constant average pressure at the nozzle regardless of the remaining solution.

Quantitative discharge is implemented by controlling the input value and thus the operation of the flow control valve 72 to implement the.

Operation of the flow control valve 72 is as described later.

First, when the first and second proportional control valves 30 and 40 are controlled by the set discharge pressure / vacuum pressure, and the discharge signal is received from the controller 60 or an external device (controller or robot, etc.), the set solenoid valve 20 is set. After opening for a period of time to discharge the liquid in the syringe 50, and before closing the solenoid valve 20, the air through the exhaust valve to maintain the state of the pipe by vacuum. At this time, the flow control valve 72 passes air through a predetermined area, and if the liquid in the syringe 50 decreases as the discharge proceeds, the vacuum pressure is reduced in proportion to the amount of liquid to prevent the intake and spillage of the liquid. . At the same time, the area of the flow control valve 72 is also increased in inverse proportion to the amount of liquid to implement the quantitative discharge.

Here, in the control of the opening rate η of the flow control valve 72, the opening rate becomes the minimum value η _min when the liquid volume α of the syringe is 100%, and the opening rate is maximum when the liquid volume is 0%. Set to be the value η _max . If the opening degree is fixed, the average value of the pressure waves applied to the syringe becomes small in the process of decreasing the liquid volume from 100% to 0% as the liquid discharge proceeds. Therefore, based on the average pressure value P _avg of the pressure sensor installed at the rear end of the solenoid valve 20, the opening ratio of the flow control valve 72 is corrected and applied as follows.

As described above, the flow control valve 72 may be configured alone, as shown in FIG. 2, wherein the flow control valve 72a is provided on a pipe connecting the solenoid valve 20 and the syringe 50. It may be arranged to increase the area of the pipe supplied to the syringe 50 to be inversely proportional to the remaining liquid in the syringe 50 under the control of the controller 60.

In addition, a plurality of flow control valves 72 may be disposed on the metered discharge device 100, and as shown in FIG. 3, a flow control valve disposed on a pipe connecting the solenoid valve 20 and the syringe 50. The flow rate control device 70 may be configured as the flow rate control valve 72b disposed on the 72a and the first piping connecting the first proportional control valve 30 to the solenoid valve 20.

In this case, the pulse control device 74 may be added to the flow control valve 72b to prevent pulsation in the installed pipe, and the flow control valve 72a on the upper side is responsible for micro flow area control. The lower flow control valve 72b is responsible for macroscopic flow area control to implement quantitative discharge through more precise flow area control. Here, the pulse purifier 74 may be provided with various means for preventing the pressure of the compressed air supplied from the compressed gas source 10 from being rapidly changed by opening and closing of various valves. It may also be implemented in the form of increasing the internal capacity of the flow control valve 72b of the position where the 74 is installed.

In addition, as shown in FIG. 4, the flow control valve 72a and the first proportional control valve 30 and the solenoid valve 20 are disposed on a pipe connecting the solenoid valve 20 and the syringe 50. As a flow control valve 72b disposed on the first pipe for connecting the second proportional control valve 40 and the second pipe connecting the solenoid valve 20 with the second proportional control valve 40. The flow rate control device 70 may be configured.

Even in this case, the pulse control device 74 may be added to the flow control valves 72b and 72c to prevent pulsation in the installed pipe, and the role thereof is as described above, but the upper pulse control device is discharged. To stabilize the pulsation in the pipe and the lower pulsation purifier function to stabilize the pulsation in the pipe during standby.

As described above, the fixed-quantity ejection apparatus according to the present invention controls the area (opening area) of the pipe so that the pressure wave transmitted to the nozzle is different depending on the remaining solution of the syringe which decreases with the discharge. Even if it changes, a constant pressure wave is transmitted to the nozzle to achieve a fixed quantity discharge.

In addition, the discharge amount may be kept constant by increasing the opening area of the flow regulating means in proportion to the gradually increasing the space in the syringe by disposing repeatedly one or more flow regulating means on the pipe constituting the metered discharge device.

As mentioned above, although the present invention has been described by way of limited embodiments and drawings, the technical idea of the present invention is not limited thereto, and a person having ordinary skill in the art to which the present invention pertains, Various modifications and variations may be made without departing from the scope of the appended claims.

100: metering discharge device
10: compressed gas source
20: solenoid valve
30: first proportional control valve
40: second proportional control valve
50: syringe
60: control unit
70 flow control device
72, 72a, 72b, 72c: flow control valve 74: pulse purifier

Claims (8)

An ejection apparatus for ejecting a liquid in a syringe through a gas supplied from a compressed gas source,
A flow rate adjusting means for adjusting a flow rate supplied to the syringe according to the remaining amount of the liquid in the syringe, the flow rate adjusting means being provided in a flow rate control device installed in a pipe constituted by the metered discharge device;
Compressed gas source;
An solenoid valve connected to the compressed gas source and configured to determine whether to supply gas at a pressure adjusted by the syringe;
A first proportional control valve disposed on the discharge first pipe communicating the compressed gas source with the solenoid valve;
A second proportional control valve disposed on a second vacuum pipe for communicating the compressed gas source and the solenoid valve;
A syringe for discharging the liquid filled therein through the gas supply of the solenoid valve; And
A control unit controlling the compressed gas source, the solenoid valve, the first proportional control valve, and the second proportional control valve; Including;
The flow rate control device includes a flow rate control valve for varying the area of the pipe installed under the control of the controller,
The flow control valve is provided in two, one of the flow control valve is disposed for the micro flow rate control on the pipe connecting the solenoid valve and the syringe is inversely proportional to the remaining liquid in the syringe by the control of the controller Increase the area of the pipe to be supplied to the syringe, and the other one of the flow control valve is disposed for macro flow rate control on the first pipe connecting the first proportional control valve and the solenoid valve the control unit Characterized in that to increase the area of the first pipe to be inversely proportional to the remaining liquid in the syringe.
Metered discharge device.
delete delete The method of claim 1,
The flow rate control device further comprises a pulse cleaning device for preventing pulsation (surging) in the installed pipe. delete delete delete delete

Images