1. The quality needs of the universal material testing machine should be considered first. The difference in the pulling force range determines the difference in the sensors used, which also determines the structure of the pulling 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.
The maintenance method of the universal material testing machine 2011-08-15 manufacturers, two, the problem of the test stroke when the universal material testing machine is repaired. 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.
3. The problem of standard configuration during the maintenance of the universal material testing 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. The output of the universal material testing machine is maintained. The test result output can be set arbitrarily: maximum force value, elongation, tensile strength, constant force elongation, constant elongation force value, 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.
5. When the universal material testing machine is repaired, it can be used as an experimental project. 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. In addition to the above items, there are some high-end tension machines on the market that can test the coefficient of friction due to their high sensor accuracy (some reaching 150,000).
Sixth, the main configuration of the universal material testing 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 screw and metal material testing machine have a decisive role in the measurement of tensile 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, that is, 0.5-1% accuracy, can be achieved by using general screws and trapezoidal screws. 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 lies in the life. Photoelectricity is one of the more advanced technologies. It is generally available for more than 100,000 times. Imported and domestic joint ventures can achieve better technology. Shanghai Tuofeng Instrument Technology Co., Ltd.
7. Test speed of universal material testing machine during maintenance. Some of the equipment on the market is 10 ~ 500mm / min, and some is 0.001 ~ 500mm / min. The former generally uses a common speed control system, which has low cost and roughness affects accuracy; the latter uses a servo system, which is expensive and has high accuracy. For flexible packaging Enterprises choose a servo system, the speed range of 1 ~ 500mm / min is enough, so that the accuracy is not affected, and the price is within a reasonable range.
8. The measurement accuracy of the universal material testing machine during maintenance. 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 ten thousandths of the tensile machine
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