JP2822048B2 - Pressure change type dispensing quantity stable dispense control device of fixed quantity dispensing device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a pressure-variable discharge amount stabilization dispense control device of a fixed-rate discharge device, and particularly to pressurizing a fluid in a container.
The present invention relates to a pressure-variable discharge amount stable dispense control device of a constant-rate discharge device that discharges a predetermined amount of fluid from a discharge side.

[Prior art] A fixed-quantity discharge device that discharges a predetermined amount from a discharge side while pressurizing a fluid in a container can be applied to a fluid having a wide range of viscosity from a low-viscosity fluid such as water to a paste-like high-viscosity fluid, It is possible to discharge an arbitrary amount from a minute amount to a large amount. Therefore, its application range is very wide, and it is used in various industries.

[Problems to be Solved by the Invention] By the way, in the conventional fixed-rate discharge device, the discharge amount of the fluid is controlled by a constant discharge time and discharge pressure, and the fluid amount in the container decreases as the discharge operation progresses. On the contrary, the air volume increases.

Then, the discharge pressure gradually decreases in inverse proportion to the increase in the air volume, and the discharge accuracy of the constant-rate discharge device deteriorates, so that there is a disadvantage that the constant-rate discharge cannot be performed.

[Object of the Invention] Therefore, an object of the present invention is to eliminate the inconvenience described above, when performing correction control, a signal of the pressure and the number of times of discharge of the fixed-rate discharge device by a pressure sensor is used as a reference value. Input to a microcomputer, calculate the amount of decrease in fluid and the amount of increase in air volume based on a reference value, and apply a constant pressure to the fluid by the electropneumatic regulator and / or increase or decrease the opening / closing time of the air passage of the solenoid valve. Automatically corrects the discharge time of the fixed-rate discharge device due to the increase or decrease in the pressure applied to the fluid by the electropneumatic regulator and / or the open / close time of the air passage of the solenoid valve. It is possible to stabilize the discharge amount and to perform the constant discharge [Means for solving the problem] In order to achieve this object, the present invention provides In a fixed-rate discharge device that pressurizes the fluid inside and discharges this fluid by a predetermined amount from the discharge side, a keyboard for initial setting and discharge signal input, a setting input signal from this keyboard, a counter value of the number of discharges, and a pressure addition value And a dispensing device having an interface for inputting a digital pressure instruction signal from the microcomputer, and an electropneumatic regulator for inputting an analog pressure instruction signal from the interface. A solenoid valve is provided in the middle of the passage, and a pressure sensor is provided in the middle of the air passage downstream of the electro-pneumatic regulator. Is input to the microcomputer as a reference value. Calculating the amount of decrease in the fluid and the amount of increase in the air volume based on the reference value, and discharging the fixed amount discharge device by increasing or decreasing the pressure applied to the fluid by the electropneumatic regulator and / or the opening / closing time of the air passage of the solenoid valve. The dispensing device according to the present invention is characterized in that the dispensing device for automatically correcting the time, stabilizing the discharge amount, and controlling to perform the constant discharge is provided.

[Operation] With the above-described configuration, at the time of a fluid discharging operation by the constant-rate discharging device, a signal of the pressure and the number of times of discharging of the constant-rate discharging device by the pressure sensor is input to the microcomputer as a reference value. Calculate the amount of decrease in fluid and the amount of increase in air volume based on the reference value, and automatically determine the pressure on the fluid by the electro-pneumatic regulator and / or the discharge time of the fixed-rate discharge device due to the increase or decrease in the opening and closing time of the air passage of the solenoid valve To stabilize the discharge amount of the fluid and achieve a constant discharge.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

1 and 2 show an embodiment of the present invention. In FIG. 2, reference numeral 2 denotes a constant-rate discharge device, 4 denotes a cylindrical container, 6 denotes a needle portion provided on the discharge side 4a at one end of the container 4, and 8 denotes a needle portion provided on the injection side 4b at the other end of the container 4. The connection unit 10 is a dispense control device for stabilizing the discharge amount of the pressure change type.

The fixed-rate discharge device 2 injects fluid into the container 4 from the injection side 4b at the other end of the container 4, connects the connection portion 8 to the injection side 4b, and pressurizes the fluid in the container 4 by the dispense control device 10. .

The dispensing control device 10 includes the dispensing device 2
Using the signal of the pressure at the time of discharge and the number of times of discharge as a reference value, the pressure on the fluid and / or the discharge time of the constant-rate discharge device 2 is automatically corrected, and the discharge amount is stabilized to perform the constant discharge. Having a configuration.

More specifically, as shown in FIG. 1, the dispense control device 10 includes a keyboard 12 for initial setting and a discharge signal input.
A microcomputer 14 for inputting a setting input signal from the keyboard 12, a counter value of the number of ejections, and a pressure addition value, an interface 16 for inputting a digital pressure instruction signal from the microcomputer 14, and an analog signal from the interface 16. And an electropneumatic regulator 18 for inputting the pressure instruction signal.

Further, the interface 16 includes a D / A converter 20 and an A / D converter.
The D / A converter 20 includes a converter 22 and a solenoid valve driver 24, and is arranged between the microcomputer 14 and the electropneumatic regulator 18.

Further, a solenoid valve 28 is provided in the middle of the air passage 26 of the electropneumatic regulator 18,
And a pressure sensor 30 between the solenoid valve 28.

Then, the solenoid valve 28 is connected to the solenoid valve driver 24, and the solenoid valve driver 24 is connected to the solenoid valve driver 24.
Is connected to the microcomputer 14, the pressure sensor 30 is connected to the A / D converter 22, and the A / D converter 22 is connected to the microcomputer 14.

The dispensing control device 10 includes the dispensing device 2
The signal of the pressure at the time of discharge and the number of times of discharge is input to the microcomputer 14 as a reference value, and the electropneumatic regulator is
A control for automatically and stepwise correcting both or any one of the pressure applied to the fluid by the fluid 18 and the discharge time of the fixed amount discharge device 2 by increasing and decreasing the opening and closing time of the air passage 26 of the solenoid valve 28. It is.

 Next, the operation will be described.

When the pressure applied to the fluid by the electropneumatic regulator 18 is automatically corrected and controlled, the dispense control device uses the signal of the pressure and the number of times of discharge of the fixed-rate discharge device 2 by the pressure sensor 30 as a reference value. The microcomputer 11 calculates the amount of decrease in fluid and the amount of increase in air volume based on this reference value.
As a result, the pressure applied to the fluid is increased, and a constant amount of fluid is discharged while maintaining the pressure in the container 4 constant.

In addition, when automatically controlling the discharge time of the quantitative discharge device 2 by increasing or decreasing the opening / closing time of the air passage 26 of the solenoid valve 28, a signal of the pressure and the number of discharges at the time of discharge of the quantitative discharge device 2 is used. Is input to the microcomputer 14 of the dispense control device 10 as a reference value, the amount of decrease in fluid and the amount of increase in air volume are calculated based on the reference value, and the opening and closing time of the air passage 26 of the solenoid valve 28 is increased. In addition, while maintaining the pressure in the container 4 constant, a constant amount of fluid is discharged.

Thus, the microcomputer 14 uses the signal of the pressure and the number of times of discharge of the constant-rate discharge device 2 as a reference value.
The amount of decrease in the fluid and the amount of increase in the air volume are calculated based on the reference value, and the pressure applied to the fluid by the electropneumatic regulator 18 and / or the air passage of the solenoid valve 28 are calculated.
It is possible to automatically correct the discharge time of the quantitative discharge device 2 by increasing or decreasing the opening / closing time of 26, and to perform the quantitative discharge while stabilizing the discharge amount by maintaining the pressure in the container 4 constant. It is practically advantageous.

Note that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the embodiment of the present invention, the description of the viscosity of the fluid is omitted, but when the viscosity of the fluid changes with the passage of time, the initial setting input may be changed as desired by a keyboard, It is possible to perform a fixed amount discharge of a fluid whose viscosity changes with the passage of time.

Further, in the embodiment of the present invention, the dispense control device of the pressurized type constant discharge device has been described, but it is used as the suction force control device of the negative pressure type material suction device used in the low viscosity constant discharge device. Automatically corrects the negative pressure on the fluid by the output signal of the discharge device and the signal of the number of discharges, keeps the pressure in the container constant, prevents failure due to excessive suction force, etc., and performs quantitative discharge You can also.

Further, in the embodiment of the present invention, the signal of the pressure and the number of times of discharge of the constant-rate discharge device is set as a reference value, and the pressure applied to the fluid by the electropneumatic regulator and / or the opening / closing time of the air passage of the solenoid valve are set. Control to automatically and stepwise correct the discharge time of the quantitative discharge device due to the increase or decrease of the pressure, but one of the pressing force to the fluid and the discharge time of the quantitative discharge device is automatically and continuously, that is, linearly. Correction control can also be performed.

[Effects of the Invention] As described above in detail, according to the present invention, a keyboard for inputting initial settings and ejection signals, and a micro inputting a setting input signal from the keyboard, a counter value of the number of ejections, and a pressure addition value. A dispensing device having a computer, an interface for inputting a digital pressure instruction signal from a microcomputer, and an electropneumatic regulator for inputting an analog pressure instruction signal from the interface is provided, and a solenoid valve is provided in the air passage of the electropneumatic regulator. A pressure sensor is provided in the middle of the air passage downstream of the electropneumatic regulator, and when performing correction control, the microcomputer uses the signal of the pressure and the number of times of discharge of the fixed-rate discharge device by the pressure sensor as a reference value. And the reference value is used to calculate the amount of fluid reduction and air volume. Calculates the amount of increase and automatically corrects the discharge time of the quantitative discharge device by increasing or decreasing the pressure applied to the fluid by the electropneumatic regulator and / or the opening / closing time of the air passage of the solenoid valve, stabilizing the discharge amount, and quantitatively discharging. Since the dispensing device that controls to achieve the above is provided, it is possible to calculate the decrease amount of the fluid and the increase amount of the air volume by using the signal of the pressure and the number of times of the discharge of the quantitative discharge device by the pressure sensor as a reference value. The discharge time of the fixed-rate discharge device can be automatically corrected and controlled by increasing or decreasing the pressure applied to the fluid by the electropneumatic regulator and / or the opening / closing time of the air passage of the solenoid valve, thereby maintaining the pressure in the container constant. Thus, it is possible to perform a constant-volume discharge while stabilizing the discharge amount, which is practically advantageous.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a schematic block diagram of a dispense control device, and FIG. 2 is a schematic configuration diagram of a constant-rate discharge device and a dispense control device. In the figure, 2 is a fixed amount discharge device, 4 is a container, 6 is a needle portion, 8 is a connection portion, 10 is a dispense control device, 12 is a keyboard, 14 is a microcomputer, 16 is an interface, 18 is an electropneumatic regulator, and 20 is D / A converter, 22 is A
The / D converter, 24 is a solenoid valve driver, 26 is an air passage, 28 is a solenoid valve, and 30 is a pressure sensor.

Claims (1)

(57) [Claims] A fixed-rate discharge device for pressurizing a fluid in a container and discharging the fluid from the discharge side by a predetermined amount, a keyboard for initial setting and a discharge signal input, a setting input signal from the keyboard, and the number of discharges. A dispensing device including a microcomputer for inputting a counter value and a pressure addition value, an interface for inputting a digital pressure instruction signal from the microcomputer, and an electropneumatic regulator for inputting an analog pressure instruction signal from the interface is provided. A solenoid valve is provided in the middle of the air passage of the electropneumatic regulator, and a pressure sensor is provided in the middle of the air passage downstream of the electropneumatic regulator. The signal of the pressure at the time and the number of times of ejection is used as a reference value for the microcontroller. And calculating the amount of decrease in fluid and the amount of increase in air volume based on a reference value, and determining the amount of pressure by increasing or decreasing the pressure applied to the fluid by the electropneumatic regulator and / or the opening / closing time of the air passage of the solenoid valve. A dispensing device for automatically adjusting a discharge time of a discharge device, stabilizing a discharge amount, and performing a fixed discharge to provide a constant discharge amount.