JPS60105019A - Discharge amount control method of liquid discharge device - Google Patents

Abstract

PURPOSE:To obtain an accurate discharge amount even with a liquid of a minute amount and high viscosity by using a discharge amount detecting signal to correct the open/close time of a valve. CONSTITUTION:Weight detecting elements 6 and 7 such as a load cell, etc. are provided to a liquid tank 1 and a discharge receiving container 5. The detection signals of both elements 6 and 7 are supplied to a controller 4. The valve open/ close time is set at the controller 4 in response to a prescribed discharge amount. A switch device 3 is actuated to open/close the valve just for said set time. While the discharge amount is calculated by a weight detection signal, and the result of calculation is compared with the set time. If the result of calculation does not reach the prescribed value even at the set time, the set time is increased until the result of calculation reaches its prescribed value. While the set time is reduced in case the set time is not obtained yet even after the result of calculation reaches the prescribed value.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a method for controlling a discharge amount of a liquid discharge device, and particularly to a discharge path control method suitable for discharging a minute amount of high viscosity liquid.

(0) Prior Art When discharging a certain amount of liquid from a tank in a machine that handles high viscosity liquids, such as adhesive applicators and solder paste applicators, conventionally, a predetermined level is set by setting the opening/closing time of a valve. of liquid was discharged.

FIG. 1 is an example of this. In the same figure, 1 is a liquid tank, 2 is a discharge valve, 3 is a valve opening/closing device, 4 is a control device, 5 is a container for a discharge liquid receiver, and the control device 4 is a valve for discharging liquid. Set the opening/closing time, and switch the opening/closing device 3 according to the set time.
Activate the valve 21sl! I try to keep it closed.

No. 3 Problem to be Solved by the Invention The above device does not have any particular problems when the viscosity of the liquid is low, but when the viscosity of the liquid is high, the viscosity or temperature changes and it is easy to crack over time, so it is particularly difficult to solve the problem. When discharging a small amount, there is a problem in that the discharge amount is not constant if only the opening/closing time is controlled.

B) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention detects the amount of discharge 1'' in the liquid tank or the discharged liquid receiver by means of a weight detection means provided on at least one side of the container. The valve 131.1 closing time set in the control device is corrected based on the signal.

(E) Embodiment In the embodiment shown in FIG.
, 7 are set (=1), and the detection signal of the pixel element 6°7 is inputted to the control oil device 4.

In the control device 4, as in the conventional case, the valve opening/closing time corresponding to a predetermined discharge amount is set, and the opening/closing device 3 is operated to open and close the valve for the set time, while the discharge is stopped by the above-mentioned Φm detection signal. The amount is calculated and the calculation result is compared with the above set time.

In this case, if the calculation result does not reach the predetermined value even after the set time has elapsed, the set time is corrected to be extended until it reaches the predetermined value. Conversely, even if the calculation result reaches the predetermined value, if the set time has not yet been reached, the set time is corrected to be shortened. Of course, if both reach the predetermined value at the same time, there is no need for correction.

In the above embodiment, the weight detection elements 6.7 may be provided in both the tank 1 and the container 5, or they may be provided only in one of them. In that case, the amount to be discharged can be determined by the decrease or increase in weight.

(f) Effects As described above, this invention corrects the opening and closing time of the valve based on the discharge amount detection signal from the double detection element, so it is possible to accurately dispense even a high viscosity liquid or a small amount of liquid. There is an effect that can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional example, and FIG. 2 is an explanatory diagram of an embodiment. DESCRIPTION OF SYMBOLS 1... Tank, 2... Opening/closing valve, 3... Opening/closing device, 4... Control device, 6, 7... Weight detection element. Patent applicant: Sumitomo Electric Industries, Ltd. Agent: Kama 1) Bun 2

Claims (1)

[Claims] In a method for controlling a discharge amount of a liquid discharge device, the opening and closing time of an on-off valve provided in a liquid tank is controlled by a control device to discharge a predetermined amount of liquid into a container, wherein a control device is provided in at least one of the tank or the container. A discharge control method for liquid discharge percentage, characterized in that a discharge amount is detected by a heavy TFI detection means, and a valve opening/closing time set in a control device is corrected based on the detection signal.