Introduction and daily maintenance and maintenance
Since my country's accession to the WTO, the textile industry has ushered in a development climax. From the perspective of the fabric market, it is the domestic market and the international market. The requirements are getting higher and higher, and the variety of designs and colors are changing faster and faster, so that the loom has stronger adaptability to fabrics and higher production efficiency. At present, most of the rapier looms in our country are at the low and medium level, with a running speed of 300
40or/min or so. The performance of a loom is good or bad, and the level of mechanical parts and electrical control is an important indicator. The electrical system of the
Rapier Loom is mainly composed of the control part and the detection part. At present, the domestic loom situation mainly reflects the following aspects.
1 control part
The control part has two forms of single-chip control and PLC control. These two forms have their own characteristics. The control cost of the single-chip microcomputer is low and the production is easy. The disadvantage is that the stability, reliability and anti-interference ability are poor, the quality of electronic components cannot be guaranteed, and the maintenance cost of manufacturers and users is high. The biggest feature of PLC control system is high reliability and stability, strong anti-interference ability. Many of its functions are realized by software technology, which can reduce the use of peripheral hardware and reduce the probability of failure. Usually, PLCs have a normal operating life of 50,000 to 100,000 hours. At present, there is no suitable PLC product in China.
The market is basically monopolized by foreign manufacturers, and the cost is higher than that of single-chip microcomputers.
be high. However, considering its reliability and stability, PLC is selected.
There are more and more manufacturers.
2. The detection part of the control system The detection element provides signals to control the loom, and the function of the detection element is very important. Proximity switches are often used as detection elements in looms. The reliability of proximity switches in long-term high-speed operation is an important issue. Occasionally a mistake will lead to defective fabrics. The solution to this problem is to use a rotary photoelectric encoder, which can quantify the mechanical position of the machine into an angle, and the PLC angle controls the loom. The rotary photoelectric encoder is an optoelectronic device with strong anti-interference ability, which can work in different environments and has a lifespan of more than 10 billion times.
3-function PLC is superior to single-chip control in terms of reliability and stability, and its achievable functions are also stronger than that of single-chip microcomputer. These functions are divided into basic functions
Auxiliary functions, management functions.
3.1 Basic functions Basic functions include electronic color selection (8 colors, more than 3000 wefts); warp breaking, weft breaking, and heavy weft parking; automatic weft searching (6 kinds of weft finding programs); fault parking light alarm; position setting (normal Parking space, fault parking space, weft detection area setting).
3.2 Accessibility
(1) Chinese display interface, intelligent man-machine dialogue, can display various parameters of the loom under different conditions. During normal operation, the current loom running angle, running speed, fabric serial number and fabric color number are displayed. When parking, the reason for parking and the current angle are displayed.
(2) The fault self-diagnosis function is divided into two categories: soft and hard faults. Soft faults: warp breakage, weft breakage, heavy weft; hard faults: brake failure (causing inaccurate angles) dobby contact failure (causing the weft finding cannot be completed) clutch failure (causing the loom cannot be started). The above faults, in addition to the Chinese display on the interface, are also accompanied by light reports.
(3) The system test function (non-running state) can detect jog, start, normal stop, forward and reverse weft searching, warp breakage, weft breakage, and heavy weft, which is convenient for loom inspection, maintenance and fault diagnosis.
(4) Safety protection function. If the loom does not move within three minutes, the color selector will automatically power off. Press jog or start, and the color picker automatically restores power. The hardware design should have the effect of absorbing the arc (spark) generated by braking to eliminate the fire hazard. Power-off data protection in various operating states, and can continue to operate before power-off after power is restored.
(5) Diversified color selection program settings. The color selection program of the PLC electronic control system can be set on a single set using the man-machine interface on the control cabinet. Complex programs or multiple loom program settings can be performed with a dedicated laptop computer (such as SEMENSMOBIC). Put the required program MOBIC in advance
It can be compiled, stored and called directly when needed. Network PC is also available
on-board.
3.3 Management functions (1) The system has built-in records of the output and production efficiency of each of the four shifts. The number of warp breaks, weft breaks, and rewefts can be queried at any time to call the set cloth length (such as 1km), and the output will stop when the set value is reached, and the length will be replaced. axis and reset to continue production. In the running state, it can be used for adding and subtracting weft to facilitate color matching.
3.4 Network management and control Using PP network, all looms can be networked, and a PC can monitor the entire production situation and read production data. At the same time, it can also transfer instructions down to modify the production process parameters. Hook up the INTERNET network, can carry on the long-distance diagnosis to the loom.
4 Comprehensive comparison Based on the analysis of the production status of domestic textile machinery factories, such as Jiangsu Gaochun, Zhejiang Titan, Shanxi Jingwei, Wuxi Longli, etc., except for Zhejiang Titan to absorb the original SM93 circuit board function and make a small change and integrate it into two large circuit boards, All other manufacturers use PLC as the core and use the rotary photoelectric encoder as the detection element as the main electronic control device, which not only simplifies the hardware design, reduces the failure points, but also improves the reliability and stability of the system. The system design is fully mature and represents the development direction of rapier looms.
5 Rapier Loom
The development trend of electrical control investigates and analyzes the application manufacturers of jianji looms, and we find that: users require looms with high reliability and
stability, and higher expectations for future looms, i.e. high speed
The running speed of the rapier loom is more than 600r/min, giving full play to the advantages of the rapier loom. At present, such high-grade rapier looms have been successfully trial-produced in China. The running speed has been doubled, and the electrical control requirements are higher. It is equipped with electronic dobby, electronic let-off, and electronic coiling. The price is lower than imported air-jet looms. , the production capacity is close to the air-jet loom. Such high-grade rapier looms have become the latest development trend in the textile machinery industry. It is believed that in the near future, high-speed rapier looms will become strong competitors of air-jet looms in the domestic market. At present, there is still a big gap between the level of looms in our country and developed countries abroad. How to deal with the increasingly fierce international competition is the top priority of every manufacturer. With backward technology and no backward products, we will continue to carry out technological innovation to be invincible. place
