A metering device for liquid material volume and its application method

Abstract

Disclosed are a liquid material volume metering device and a using method of the liquid material volume metering device. A container of the liquid material volume metering device is fixed to the lower portion of a support, and the entire inner cavity of the container is filled with a piston. A servo motor is arranged at the top end of the support, a lead screw is vertically arranged, one end of the lead screw is fixedly connected with the piston, and the other end of the lead screw is connected with the servo motor. A feeding pipe is arranged on the side wall of the container, and a first solenoid valve is arranged on the feeding pipe. An overflow pipe is arranged on the top of the container, and a discharging port is formed in the bottom end of the container and provided with a second solenoid valve. The first solenoid valve, the second solenoid valve and the servo motor are connected with a control end respectively and are controlled by the control end to move to complete metering control. The liquid material volume metering device overcomes the defect that metering errors are large when a flowmeter is used for high-frequency batching micro-metering, is superior to other devices in weight metering mode, can meet requirements for metering precision under the condition that the flow value changes greatly, and meets requirements for liquid metering precision under environments seriously affected by outside factors like shaking, vibration and airflow.

Description

technical field [0001] The invention relates to a device for accurately measuring the volume of liquid materials, which belongs to the technical field of liquid metering equipment. Background technique [0002] There are currently two methods of measuring liquid materials. One is the volume measurement method, in which the volume measurement of the liquid material is generally completed by flow meter measurement. The problem is that the flowmeter is not suitable for the measurement of high-frequency, multi-batch micro-input of liquid, because the liquid in the delivery pipeline has not yet formed a stable flow rate state when the high-frequency, batch micro-input is input. In this case, the required amount of liquid material has reached the required amount, and the flow meter is used to measure the liquid measurement with a steady flow rate and a steady state for a certain period of time, so the measurement accuracy cannot meet the requirements in this case. Another measur...

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Problems solved by technology

The problem is that the flowmeter is not suitable for the measurement of high-frequency and multi-batch micro-input of liquid, because the liquid in the delivery pipeline has not yet formed a stable flow rate state when the high-frequency and batch micro-input is input. In this situation, the required amount of liquid material has reached the required amount, and the flowmeter is used to measure the liquid measurement with a steady flow rate and a steady state for a certain period of time, so the measurement accuracy cannot meet the requirements in this case

Another measurement method is the weight measurement method. Its principle is to use the load cell to convert the weight signal into a matching electrical signal to complete the measurement. However, the weight measurement is limited by the following conditions of use. One is that it cannot meet the large value changes. The second is that it cannot meet the measurement requirements in environments with severe external interference such as shaking, vibration, and airflow.

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