Design Of Broken Yarn Joint Control System Based On Matrix Switch

Yarn is one of the basic factors of textile products, its quality plays a decisive role for textile processing and final products, and largely affect the wearing and practical features. And The performance quality of spinning machine decided the yarn’s quality, in the common air spinning yarn, the number of spindles are generally very large (as many as thousands of each machine road), and it must meet more workers, multi-channel operation at the same time, the workload is quite large, the broken yarn joint is one of the important link, because it should be done to timely find out the broken yarn on spinning process, accurate positioning and automatically re-connect it to makes per spindle yarn only has two heads under the enough length, and ensure that it has the same thickness and strength standard with the no-joint position, and avoided length of irregular, uneven thickness and strength is different in the process of weaving yarn, it is related to the quality of spinning and yarn quality. At present, the joint technology of spinning machine is usually used for workers of artificial joint, single chip microcomputer control system and PLC system control joint, but artificial joints need workers have very skilled craftsmanship, and joint timing is not easy to control, it often can cause lengthy joint time and yarn quality is not assured, low efficiency; For single chip microcomputer system, it is not enough only to use the I/O of single chip microcomputer to meet the huge equipment input/output interface, and it’s very limited even after extended, it will be greatly increase the number of single-chip microcomputer if blindly meet the input and output interface of machinery equipment, and it will lead to serious challenges to the consistent performance for each single chip microcomputer and greatly increase the cost of design and maintenance, lower reliability and performance to price ratio is not high; PLC control although basically solve the key problem of broken yarn joint, but also face the problem of limited I/O port, the price of PLC is relatively high, so increase quantity in order to satisfy the PLC I/O number can cause low cost performance, and can make it not flexible to set the data, every time we need professional personnel to set up and debug logic controller to make it run normally when we change the yarn specifications, it will bring a lot of inconvenience to production and maintenance. So it’s important to develop new and highly automated control system to satisfy the production and needs of the production and market.But this design is put forward through the analysis and improvement to the problems faced in the above methods, it discuss the design and implementation process of the air spinning yarn breaking joint control system in detail, mainly including its demand analysis, hardware design, software design and performance test, etc.This design uses single-chip computer as the upper machine, control system based on FPGA as the lower computer, it composed of a upper computer control system and more than one unit control system, and the upper computer control system consists of a CPU computing center, an LCD screen, keyboard and communication terminals. Lower computer control system contains24road signal detection ports, power supply, the FPGA computing control nuclear and48road power output control ports, every road signal detection port control two way power output ports. It can independently complete the all functions of RU-14German air spinning machine216spindles yarn breaking wiring. Upper computer controller provides different delay requirements for different yarn breaking connectin required, it can provide10ms-990ms stepper control signal which can be arbitrarily set and synchronously display on the LCD screen. And the power of two way delay output signal should be content with the work of relay with48V/2A power.The system consists of a set of control system based on the matrix switch, it has large I/O ports and complete the automatic control of airflow spinning yarn breaking connectors through to the upper machine and lower machine software design and hardware design. Hardware circuit part can be composed of three parts, they are the upeer computer system control panel, the FPGA core board and FPGA control panel floor, single chip microcomputer circuit mainly do the setting of two output delay time and communications with the FPGA, and can be set what we want by keyboard any time, then synchronously display on the LCD screen. Time setting can be operated through the button, according to the design of the software can complete the add and subtract operations to achieve the purpose of changing time, it’s flexibility, the interface of upper computer and FPGA adopts RS485serial port. FPGA core panel mainly uses the EP1C3T144C8chip as a core which is belong to cyclone series of ALTERA corporation, and includes development board circuit, it connection on the FPGA control motherboard through socket, the FPGA control floor mainly complete the corresponding control signal of input and output, through the FPGA chip connection among them, it also include connection with the single chip microcomputer system board.The scheme is high integration, high reliability, strong commonality etc, in addition, it greatly improves the labor productivity and reduces the labor intensity. It has been successfully applied in many textile enterprise’s air spinning machines.