With the need of testing various technological indexes of textile products, new and high-precision textile instruments emerge one after another. Some professional verification regulations issued by the state Textile Ministry are far from meeting the needs of textile instrument verification. Then, how to guarantee the most advanced textile instruments at home and abroad to provide accurate and reliable measurement data for production and quality, this is an important issue in front of our enterprise measurement personnel.
Textile industry is a typical physical processing production process, the entire production process is the fiber between the structure of the finishing and reorganization process. Although the textile industry is typical of FA, almost all kinds of automation products are currently used in textile equipment, mainly including control systems, drive control, motion control, human-machine interface and sensors.
In the next few years, the main trend of textile machinery industry automation technology development includes the application of special controllers will increase; The application of multiple drives is more common and the application of fieldbus increases these three aspects.
Use of dedicated controllers will increase. Compared with PLC, the special controller based on embedded products has the advantages of strong computing power and convenient communication. The control requirements of textile machinery are relatively simple and the application of large batch is very suitable for the development of special controllers. At present, special controllers are used in weaving machines, knitting machines and some dyeing and finishing equipment.
The use of multiple drives is more common. Compared with the centralized drive and the transmission and distribution of power through mechanical mechanism, multiple drives can effectively reduce the complexity of equipment, improve driving efficiency, facilitate process regulation, reduce maintenance and shorten the design and development cycle of new equipment. At present, the roving frame, spinning frame, winding frame and all kinds of chemical fiber machinery have used the multi-drive technology, and the field bus technology and common DC bus technology make the multi-drive more advantageous. Cost is the key factor limiting the large number of multi-drive applications. The gradual decrease of drive prices will make more users try multi-drive products.
Fieldbus usage increased. Some textile machinery consists of several closely related processes, and the use of fieldbus to coordinate each process can effectively improve production efficiency. At present, staple fiber, dyeing and finishing production lines and some large machines are beginning to use fieldbus.
Due to the large variety of textile testing instruments, different performance, price, production factory, also when instruments of choose and buy, should not only be familiar with textile materials performance and product use and other professional knowledge, also want to know the performance and characteristics of each instrument from the manufacturer, after a thorough analysis and comparison, choose suitable textile testing instruments, make it can not only satisfy the production and scientific research and practical needs, and to prevent blind competition strengths, causing unnecessary economic waste.
In order to ensure the accuracy and consistency of the measurement results of textile testing instruments and make their quantity value stable within a certain tolerance range, it is necessary to pay sufficient attention to their good metrological performance and conduct necessary metrological verification when choosing and using the instruments. Such as:
(1) an instrument often has several ranges to choose, the general instrument range of indication error is larger at both ends, so according to the different test objects, should choose a reasonable and appropriate instrument range.
The precision of the instrument (referred to as precision) is a comprehensive reflection of the random and systematic errors of the instrument, in order to obtain the correct measurement results at the same time, it is necessary to choose the appropriate accuracy level of the instrument
(3) the reproducibility of the instrument indicates that under different measurement conditions, for the consistency of the same measured physical quantity, commonly known as the error between the stations or "station difference", is one of the reproducibility indicators. Therefore, when selecting the instrument, it is very important to require good reproducibility.