Opening and closing control method and system for stepping motor control valve of meter

Abstract

The invention discloses an opening and closing control method and system for a stepping motor control valve of a meter, and belongs to the technical field of meters. The problems that opening and closing control of an existing stepping motor control valve of a meter is unstable, and consequently, air leaks from the valve and the valve deforms are solved. The opening and closing control method andsystem for the stepping motor control valve of the meter comprises the following steps that a stepping motor is started to execute an opening and closing program of the valve; in the opening and closing program, the operation step number and a locked-rotor current of the stepping motor are detected; according to the detecting result of the operation step number of the stepping motor and the detecting result of the locked-rotor current, valve opening-closing in-place judgment is conducted; if the operation step number and the locked-rotor current meets the preset conditions of valve opening-closing in-place, it is determined that the valve is opened and closed in place, and the opening and closing program is finished; and if the operation step number and the locked-rotor current do not meetthe preset conditions of valve opening-closing in-place, or one of the operation step number and the locked-rotor current does not meet the preset conditions of valve opening-closing in-place, it isdetermined that the valve is not opened and closed in place, and the opening and closing program continues being executed.

Description

【Technical field】 [0001] The invention relates to the technical field of meters, in particular to an opening and closing control method and an opening and closing control system for a stepping motor control valve of a meter. 【Background technique】 [0002] With the continuous development of gas metering technology, industrial gas metering technology is also increasingly innovative. Industrial gas meters can be divided into external valves and built-in valves according to the installation form of the valve. The stepper motor built-in valve is a type of built-in valve that has recently emerged. It has the advantages of large starting torque and precise stroke control, thereby effectively reducing or even avoiding The impact of the high torque output by the motor on the transmission structure when the rotor is locked. However, due to the differences in the structure and size of the valves, the switching distances of the same type of valves will also be different even under the...

AI Technical Summary

Problems solved by technology

However, due to the differences in the structure and size of the valves, the switching distances of the same type of valves will also be different even under the control of the same program. In this way, in the actual application of industrial gas meters, some valves will not be switched in place, and there will be problems. Hazard of leaking air, or a situation where the valve continues to travel after it is in place, causing the valve to deform

[0003] In the prior art, there is a technical solution for improving the above situation by adding valve in-position detection technology on the basis of the above-mentioned control method. This technical solution has a good effect under normal application conditions, but when there is static electricity in the application site of the industrial gas meter At this time, due to static electricity interference, the situation that the valve is not in place and a blocked rotor current is detected, at this time the valve will stop moving, and the above problems will also occur. If a functional module for filtering static electricity is added to solve the problem of static electricity interference, the cost of the valve will also increase. will increase accordingly

Images