Research On Control System Of Roving Testing Frame

The mechanical structure of traditional roving frame is complex, this made it has a lower controlling precision, and inconvenient to regularize the process specification. The modern new type roving frame used frequency or servo system, but its technology adjusting, especially the winding and forming still has a lot of trouble. Both of these two roving frames are not suitable for teaching and research. In order to solve this problem, combined with modern digital control technology, this paper developed a roving testing frame which is suitable for teaching and research, and focused on the design and implementation of the roving testing frame control system.The main works and results of the paper are as follows:(1) Based on the simplified mechanical mechanism of the roving testing frame, designed the control system scheme. The two front roller, two back roller, flyer, tuber and lifter of the roving testing frame adopted independent servo control. The control system adopted digital control technologies, such as PLC (programmable logic controller), servo drive, touch screen, and serial communication technology etc, which supported constructing the hardware platform of the roving testing frame control system. The control system took PLC as the control nucleus, touch screen as human-computer interface, and the lower position machine adopted servo system driving mechanical structure. PLC gained the roving technical parameters from touch screen, calculated the speed and position parameters of the servo motors according to the mathematical mode, and transmited datas to servo systems by RS-485bus communication which realized the control of the sever motors. Through this, the control implemented the drafting, twisting, winding, forming of roving and the online adjustment of technical parameters. Test showed that the control system designed and implemented in this paper can satisfy the functions of roving testing frame.(2) Combined with the technological requirement of roving testing frame, this paper established the mathematical modes of the servo motor speed. The mathematical modes of roller and flyer were mainly derived from their transmission. But the mathematical modes of tuber and lifter involve the roving winding diameter. This paper based on the roving layer thickness increasing in accordance with the laws of arithmetic progression, deduced the axial and vertical winding density of roving. And on this basis, this paper introduced a correction factor which is based on the raw materials to establish the mathematical mode of tuber. Practice showed that with the mathematical modes this paper proposed, it can have a good roving winding shape.(3) Programmed the software system of the roving testing frame, which including the design of man-machine interface program and PLC program. The man-machine interface program is mainly to realize the functions of parameter setting, equipment operation, monitoring and tension control. The PLC program is mainly to realize the functions of roving process calculation, process control and equipment failure treatment. Through the designing and debugging of the software, results showed that this software system can have a good implementation of roving frame’s main functions.(4) The program of roving testing frame control system is debugged in this paper, and the roving experiments were carried out on this roving testing frame. Through debugging and optimizing, and keeping solving the problems right, the roving testing frame achieved a good effect of roving. This paper also gave the range of each roving process parameters. This showed the effectiveness of the control system.In conclusion, technical scheme of the roving testing frame control system this paper designed on roving testing frame is feasible. The hardware is appropriate, and the machine is stable reliable in operation. The program based on the mathematical modes this paper established can make the mechanical structure running coordinated, and obtain a good roving winding shape with a good quality. The interface is man-friendly designed for operation and controlling easily, this can better satisfy the teaching and scientific research needs.