Rotary screen printing machine control program
1. Model description
Model: Textile equipment - printing machine - rotary screen printing machine
The control drive system of domestic rotary screen printing machine is mainly divided into two types. One is to control and drive the whole set of imported products, such as Yaskawa, etc. The overall function and performance of this scheme are better, but the system cost is high, maintenance and use. The cost is high, the programming and debugging are complicated; the other is the domestic manufacturer's self-made control system with standard servo drive. The advantage of this scheme is that the price is low, but because the servo drive is a standard product, it can not effectively cooperate with the control system. The structure of the control system is bloated and dispersed, the wiring is complicated, and the reliability is low.
2. Description of the program
1. Speed synchronization control of the cloth, drying room, and falling unit
In this scheme, the feeding, drying room and falling unit are driven by asynchronous motor, the inverter is adjusted, the motor encoder signal is connected to the inverter (for inverter vector control), and also connected to PLC, PLC according to the printing guide With the speed of the belt, the PID adjustment algorithm is used to control the rotation speed of the inverter to achieve the purpose of synchronizing with the printing guide belt. At the same time, the proportional operation of the three relative conduction belts can be realized by the setting of the upper human-machine interface.
2. Net roll position synchronization
The web roll position synchronization is realized by the EM261 special printing module.
The EM261 printing module is specially designed for the printing industry. It can be connected to the backplane bus of the CTSC-200 PLC. The CTSC-200 PLC controls the EM261 by calling the library program. The EM261 contains four 500Khz pulse outputs for controlling the print color group servo, and has four 200Khz high-speed pulse inputs for encoder position feedback of the driver. Each EM261 module can control 4 servo axes synchronously. One CTSC-200 PLC can hang 5 EM261 modules, which can control and control 20 servo axes synchronously.
3. Color control
In this solution, the rotary mesh servo adopts the Hexin H1A series servo drive, and the H1A servo drive integrates the internal phase adjustment function, that is, the driver can superimpose the signal from the PLC for correcting the printing deviation.
In practical applications, when it is necessary to correct the phase of a certain mesh roller, the operator can set the correction amount to the PLC, and the PLC transmits to the H1A servo driver through the CANopen bus, and the H1A driver can control the motor to compensate the phase deviation.
4. Operation interface
In this scheme, there are three 10-inch human-machine interfaces placed in the vicinity of each unit for easy operation and monitoring by the operator; each mesh roller has an operation panel for operating the corresponding units.
All of these HMIs and operator panels communicate with the PLC via the bus.
