Statistical principle and PLC technology-based method for measuring and calculating discharge amount of tobacco shred storage cabinet

Abstract

The invention relates to a statistical principle and programmable logic controller (PLC) technology-based method for measuring and calculating discharge amount of a tobacco shred storage cabinet. The method comprises the following steps of: 1) acquiring a plurality of groups of field bottom belt running experimental data to acquire multiple groups of data of bottom belt frequency converter running frequency and bottom belt running speed, and obtaining an equation f(x)=ax+b based on statistical regressive analysis; 2) performing definite integration on the f(x) by using a PLC cyclic interrupt function block so as to obtain the running length of the bottom belt after multiple times of start and stop; 3) calculating the discharge amount of the shred storage cabinet through a function block (FB) in the PLC by using a formula 'shred storage cabinet discharge amount = bottom belt discharge length * cabinet feeding quantity / distribution length during feeding the cabinet'; and 4) performing high and low speed conversion of stub bar / tail during discharging of the shred storage cabinet in the FB of the PLC by using the real-time discharge length of the bottom belt, performing tail stop and starting related control in advance in the next cabinet. Any hardware detection equipment of the storage cabinet is not needed, many disadvantages and measurement errors caused by detection elements are solved, the accuracy of a system is improved, and the cost is reduced.

Description

technical field The invention relates to a control technology in the tobacco processing industry, in particular to a method for measuring and calculating the discharge volume of a tobacco wire storage cabinet based on statistical principles and PLC technology. Background technique At present, in the tobacco shred making process, the wire storage cabinet is mainly used for alcoholizing, storing and balancing the moisture of the tobacco leaves (shreds). At present, the general-purpose wire storage cabinets in the tobacco industry use proximity switches to count the discharge pulses, and use the current discharge pulses to convert them into "cabinet output". Usually the proximity switch is installed at the sprocket at the bottom of the wire storage cabinet or under the beam of the bottom belt. When the wire storage cabinet is discharging, the bottom belt is in the process of multiple starts and stops for a long time, and due to various reasons such as the reliability of the pr...

AI Technical Summary

Problems solved by technology

When the sprocket or the bottom belt beam sensed by the proximity switch is near the proximity switch (generally about 1cm), when the above problems occur, this will cause an overcounting phenomenon of counting pulses

In another case, when the bottom belt sprocket is worn or replaced with a new sprocket, the height of the sprocket is inconsistent, which may cause the proximity switch (the sensing distance is generally 1 to 1.5cm) to be unable to sense the height of the sprocket. Low, if the distance between the proximity switch and the sprocket is reduced at this time, the proximity switch may be damaged by the higher sprocket

The above two situations will result in overcounting or undercounting of counting pulses, resulting in deviations in the calculation of the amount of storage cabinets and storage cabinets, which will cause damage to the detection equipment and increase maintenance and maintenance costs.