At present, weighing control system of concrete mixing station mainly uses the discharge valve opening control. And because of unequal drain holes, uneven materials particle sizes, the changing distance between materials and hopper, the material weighing error is large, the concrete mixing ratio error is also imprecise, and the concrete strength quality and curing time have also been great affected. This system uses the time error control principle. According to the material weight error of the

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... last discharge valve open time, the next open time difference is calculated. The last material weight error is compensated. Many discharges effectively solve the error problems of said weighing system and improve measurement accuracy and the mix proportion of concrete. This control method has been successfully applied to the mixing station control system of PLC reconstruction to ensure the system stable operation and concrete curing time, improve weighing precision and concrete strength quality. It has been proven to improve the system running environment and achieve good economic benefits.