1. The quality needs should be considered first when the tension machine is repaired. The difference in the tension range determines the difference in the sensors used, which also determines the structure of the tension machine, but this item has little effect on the price (except for the door type). For general flexible packaging manufacturers, a pull range of 100 Newtons is sufficient. Therefore, it was decided to use the single-arm type. The structure corresponding to the single-arm type is the portal structure, which is suitable for relatively large pulling forces, such as one ton or more. Therefore, flexible packaging manufacturers basically do not need it.
Second, the problem of the test stroke during maintenance of the tension machine. According to the performance and requirements of the flexible packaging film, the stroke can be 600-800mm. If the material elongation exceeds 1000%, the stroke of 1000 or 1200mm can be used.
Third, the standard configuration problem in the maintenance of the tension machine. Three basic intelligent configurations: host computer, microcomputer, and printer. If the microcomputer has strong functions, you can print directly. It can also be equipped with ordinary computers. With a computer, you can perform complex data analysis, such as data editing, local zoom, adjustable report format, and statistical analysis in groups. If equipped with a computer, the manufacturer should add the corresponding control system.
4. Output results when the tension machine is maintained. The test result output can be arbitrarily set: maximum force value, elongation, tensile strength, constant force elongation, constant elongation force value, yield strength, elastic modulus, maximum test force 8 items. This can be said to be the most comprehensive result output when the microcomputer is operated. The products of some foreign manufacturers can generally output these 8 items. Some domestic manufacturers can output 5-6 items, and some manufacturers can only output the maximum force value, average value, and minimum value.
Fifthly, it can be used as an experimental project during maintenance of the tension machine. Flexible packaging requires a multi-purpose tensile machine, that is, on the basis of different fixtures, it can be used for tensile, compression, bending, tearing, shearing, 180 degree peeling, and 90 degree peeling tests. There are some high-end tension machines on the market. In addition to the above items, due to their high sensor accuracy (some reaching 150,000), they can also test the friction coefficient.
Sixth, the main configuration of the tensile machine maintenance product machinery: transmission, screw drive and rack drive, the former is expensive, used for high precision, high test repeatability; the latter is cheap, used for low precision, low test repeatability. The lead screw plays a decisive role in the measurement of tension accuracy. The general ones are ball screw, trapezoidal screw and general screw. Among them, the accuracy of the ball screw is the highest, but its performance can only be achieved by the operation of the computer servo system, and the whole set is relatively expensive. The precision required for flexible packaging can be achieved by using general screws and trapezoidal screws, that is, 0.5-1% accuracy. Transmission, there are gear transmission and chain transmission, the former is expensive and used for high precision; the latter is cheap and used for low precision. The main cost of the sensor is life. The photoelectric sensor is one of the more advanced technologies. It is generally available for more than 100,000 times. Imported and some domestic joint ventures can achieve better technology. Shanghai Trust Instrument Co., Ltd.
7. Test speed for maintenance of tension machine. Some of the equipment on the market is 10 ~ 500 mm / min, and some is 0.001 ~ 500 mm / min. The former generally uses a common speed control system, which has lower cost and roughness affects accuracy; the latter uses a servo system, which is expensive and has high accuracy. For flexible packaging companies, the use of a servo system, the speed range of 1 ~ 500mm / min is sufficient, so that it does not affect accuracy, the price is within a reasonable range.
8. Measurement accuracy during maintenance of the tension machine. Accuracy issues include force measurement accuracy, speed accuracy, deformation accuracy, and displacement accuracy. These precision values ​​can be up to plus or minus 0.5. But for general manufacturers, 1% accuracy is sufficient. In addition, the resolution of the force value can almost reach the maintenance of the ten thousandths of the tensile machine.
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