Method and device for displaying and controlling opening of electric butterfly valve

Abstract

The invention relates to a method and a device for displaying and controlling the opening of an electric butterfly valve by using a computer program. A control return circuit which comprises a programmable controller connected with a computer and a driving contactor of the electric butterfly valve is adopted. The method is characterized in that time from starting the electric butterfly valve to thoroughly opening the electric butterfly valve is used as a numerical value that the opening of the electric butterfly valve is 100 percent; time that the electric butterfly valve is opened or closed every time is compared with the time that the opening of the electric butterfly valve is 100 percent, the opening magnitude or the closing magnitude is calculated, and the opening percentage of the electric butterfly valve is obtained; and a counter is set to be zero when the electric butterfly valve is fully closed, which displays 0 percent of the opening. The invention does not require investment in software and hardware, only requires to skillfully use functions, such as the counter of STEP7 software, a passing block, a multiplication block, a division block, and the like to accurately control the opening of the electric butterfly valve instead of a performer, avoids operational errors, and can greatly save engineering cost and maintenance cost when being used in the performer and a system of the electric butterfly valve.

Description

technical field [0001] The invention relates to a control method of an electric butterfly valve, in particular to a method and a device for realizing the display control of the opening degree of the electric butterfly valve by using a computer program. Background technique [0002] A wide variety of electric butterfly valves are widely used in industrial production processes. Traditional electric butterfly valves use two contactors to control the forward and reverse rotation of the motor, and the motor drives the butterfly valve to open and close the valve. When the valve is turned to the fully open or fully closed position, the limit switch on the valve is touched, the limit switch cuts off the contactor, and the valve stops acting. This control method has a simple and reliable structure, low one-time investment, and is widely used in industrial production processes. However, the traditional control method of the electric butterfly valve has a fatal shortcoming, that is, t...

AI Technical Summary

Problems solved by technology

However, the traditional control method of the electric butterfly valve has a fatal shortcoming, that is, there is no position indication. When the valve is not in the limit position, the operator cannot understand the opening of the butterfly valve, and cannot realize 0-100% arbitrary opening control.

Not only bad for control, but also unable to realize computer system control

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