Control method of weighing re-inspection scale

Abstract

The invention relates to a control method of a weighing re-inspection scale. The control method is characterized by specifically including the following steps that (1) power is supplied to initialize a program, and a PLC control system is in communication connection with a weighing instrument, reads a target value, a tolerance value and a net weight value of the weighing instrument and obtains the overproof range; (2) the weighing instrument displays the real-time weight on the re-inspection scale, and when the displayed value is 0kg, a re-inspection belt conveyor operates; (3) when an optoelectronic switch on the re-inspection belt conveyor detects packaged objects, the re-inspection belt conveyor is stopped; (4) after time is delayed by T1, the actual weight of objects on the re-inspection scale is read; (5) the read actual weight and the overproof range are compared, and if the actual value is within the overproof range, the weight is qualified, and the re-inspection belt conveyor is started again after time is delayed by T2; and (6) if the actual weight is beyond the overproof range, an overproof alarm is output. According to the control method, the defect of low precision of a dynamic weighing re-inspection scale is overcome, and for a static re-inspection scale, production efficiency is improved.

Description

technical field [0001] The invention relates to a control method for a weighing re-inspection scale, and belongs to the technical field of control methods for auxiliary equipment of packaging equipment. Background technique [0002] Before the materials packaged by the packaging equipment enter the warehouse, it is necessary to check whether the weight of the package is within the accuracy range. In the existing technology, one method is to use a dynamic re-inspection scale. For the control method of the dynamic belt re-inspection scale, when weighing during the conveying process, the measurement accuracy is not high, and it cannot work normally in some occasions with high precision requirements. use; and another traditional static re-inspection scale control method, no matter whether the weight is qualified or not, it needs to be manually stopped and weighed, which is not only time-consuming and laborious, but also seriously affects production efficiency. Contents of the ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a control method for weighing and re-inspecting scales, which can solve the shortcomings of the existing control methods for weighing and re-inspecting scales, and make up for the low accuracy of dynamic weighing and re-inspecting scales. Insufficient, for static re-inspection scales, improved production efficiency

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