To produce a carpet with both loop pile and cut pile, the tufting machine must control the action of the corresponding parts according to the mechanical structure through the electronic control system.
According to the analysis of the mechanical structure principle of the tufting machine, the formation of the carpet pattern of cut pile or loop pile is mainly related to two parts: the conveying speed of the yarn and the relative position of the spring. The conveying speed of the yarn determines the pile height of the carpet , and the relative position of the leaf springs determines whether the resulting carpet is cut or loop pile.
According to the understanding of the mechanical structure of the on-site tufting machine, a pressure roller is installed on the yarn drum, and the position of the pressure roller is controlled by an air valve. The rotation speed of the drum determines the conveying speed of the yarn, and by setting two groups of drums with different speeds, fluff with different heights is generated. In addition, the control of the position of the spring sheet adopts the third group of solenoid valves, and the work of the whole tufting machine is controlled by the coordination and cooperation of the three groups of control devices.
The data and control commands are transmitted between the upper computer and the lower computer through the serial bus. The upper computer is a PC, and the lower computer is a single-chip computer, and the two are serially transmitted through the RS-232 bus. The RS-232 level and the logic level of the microcontroller are completely different. To communicate between the two, the level conversion must be carried out.
The control system of the lower computer connects the signal sent by the upper computer to the serial communication port Rxd of the single-chip microcomputer through level conversion, receives the data of the upper computer, and stores it in the off-chip memory; the Txd port of the single-chip microcomputer passes through the level conversion circuit. The RS-232 serial bus is connected to the upper computer, and the data in the lower computer is transmitted to the upper computer.
The data is received and stored in the external memory, and the main control circuit of the lower computer receives the working mode selected by the upper computer through the microcontroller control program. According to the selection category of the mode, the data in the off-chip memory is sequentially divided into three channels and serially output to the driving circuit, and the serial transmission is beneficial to simplify the system structure and save the development cost. The first thing the drive circuit completes is the serial-in-parallel-out conversion of the control signal, and the output data of each shuttle is obtained, which is output to the solenoid valve in parallel through the drive amplifying circuit. The action of the solenoid valve controls the delivery of the yarn to form loop piles and cut piles. In the main control circuit of the single-chip microcomputer, the functions that the program needs to implement have the following parts:
(1) Receive the bitmap data transmitted by the host computer and store it in the memory;
(2) Receive the working mode selected by the host computer interface;
( 3) Work according to the selected mode;
(4) Upload the working data of the tufting machine to the man-machine interface in real time.
https://www.wxmatale.com/
QR Code
