Control method for automatically detecting roll diameter in unrolling and roll changing process of unit type photogravure press

Abstract

The invention discloses a control method for automatically detecting the roll diameter in the unrolling and roll changing process of a unit type photogravure press. The control method specifically comprises the following steps that equipment testing is firstly carried out, and a tool A and a tool B are mounted on a pre-driven new roll air expansion shaft; a collection preparation button is pressed, and a parameter a1 and a parameter a2 are read; when equipment runs normally, the collection preparation button is pressed, a potentiometer used for detecting the diameter on a rotary frame has a voltage signal ranging from 0 V to 10 V, and the voltage signal is read by a PLC in the manner of the analog quantity; then the current radius r of a new roll is calculated, and the current radius r of the new roll is calculated according to the measured data a, a1 and a2; and finally a speed set value is given to the new roll according to the relation between the current speed and radius r, and therefore the pre-drive linear speed of a material shaft of the new roll is synchronous with that of an old roll, and smooth collection is achieved. The problems that in the roll changing process in an existing method, the calculation error of the roll diameter is large, and testing is hard are solved.

Description

technical field [0001] The invention belongs to the technical field of printing machine equipment control, and relates to a control method for automatically detecting the roll diameter of a unit-type gravure printing machine for unwinding and changing rolls. Background technique [0002] The new shaft roll diameter detection mechanism of the unwinding unit is the core component of the double-station gravure printing machine to complete the automatic roll change. The synchronous speed setting of the unwinding and cutting unit of the current unit-type gravure printing machine is determined by the photoelectric switch of the big arm of the cutter to determine the position of the rotary frame rotating in place, and the wire-wound potentiometer detects the reading of the potentiometer at this position. The PLC roughly calculates the diameter of the new unwinding shaft according to the relationship between the potentiometer segments during equipment debugging, and the PLC calculat...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a control method for automatically detecting the roll diameter when unwinding and changing rolls of a unit-type gravure printing machine, which solves the problems of large calculation errors of roll diameter and difficult debugging in the existing method when changing rolls

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