Abstract:

The air valves of underwear machine are various and scattered. After analyzing and classifying the function and performance requirement of the valves in different location, a kind of distributed drive suggestion based on RS485 bus is put forward. According to distributed structure of control unit, total design framework is built and the article introduce the hardware circuit design, the software development and communication protocol which is formulated on the basis of control commands transmission requirements are discussed. In order to reduce the power and enhance the operating accuracy, pulse width modulation (PWM) mode is used as the drive mode. The current in different parameters (frequency and drty cycle) is measured, and in combination with the real movement, the most suitable parameters are selected. The results indicated that the solution and reliable, and the valve gas work efficiently, satisfying the control demand on the seamless underwear machine.

Key words: seamless under wear machine, air valev, destribution drive control, frequency, duty cycle