How to identify the quality of electronic tensile tester?

1, the test trip problem.

According to the nature of the goods that one's company needs to test, select a model. For example, if a product with a large elasticity and a long length is tested, it is necessary to communicate with the manufacturer's technical department in advance when ordering a tensile testing machine. Take flexible packaging film as an example, it needs the performance and requirement of testing. The stroke can be 600-1500mm. Materials with an elongation of more than 1000% can be used with a stroke of 1000 or 1200mm.

2, the standard configuration problem.

There are three basic types of intelligent configuration: host computer, microcomputer, and printer. If the microcomputer is powerful, it can be directly printed. In addition can also be equipped with ordinary computers. With a computer, you can perform complex data analysis, such as data editing, local magnification, adjustable report formats, and statistical analysis of grouped patterns.

If equipped with a computer, the manufacturer should be added to the corresponding control system.

3, the output results.

The output of the test results can be arbitrarily set: maximum force value, elongation, tensile strength, constant force elongation, constant tensile force, yield strength, elastic modulus, and maximum test force. This can be said to be the most comprehensive result of the output of the microcomputer. Some foreign manufacturers' products 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.

4, in the experimental project can be done.

The flexible packaging requires a multi-purpose pull machine, that is, on the basis of different fixtures, it can perform tensile, compression, bending, tearing, shearing, 180 degree peeling, and 90 degree peel test.

There are some high-grade tensile machines on the market that, in addition to the above items, can also be tested for their high sensor accuracy (some of which reach 350,000th of one thousandth).

5, product machinery main configuration:

Transmission, screw drive and rack drive, the former is expensive, used for high precision, test repeatability is high; the latter is cheap, used for low accuracy, test repeatability is low.

Screws have a decisive effect on the accuracy of tension measurements. General ball screw, trapezoidal screw, general screw. Among them, the accuracy of the ball screw is the highest, but the performance of the ball screw depends on the operation of the computer servo system to play, the entire package price is also relatively expensive. The general screw and trapezoidal screw can be used to achieve the required precision of the flexible packaging, ie 0.1-1% accuracy.

The main cost of the sensor lies in its longevity. Photoelectric sensing is one of the more advanced technologies. Generally, it can be used more than 100,000 times. Imported and domestic joint venture manufacturers can achieve better technology6 and test speed.

Some of the equipment on the market are in the range of 10~500 mm/min, and some are in the range of 0.001~500 mm/min. The former generally use common speed control systems, which have lower costs and coarser influence on accuracy; the latter use servo systems, which are expensive and have high precision. For flexible packaging companies, the use of servo systems, the speed range of 1 ~ 500mm/min is sufficient, this will not affect the accuracy, the price is within a reasonable range.

7, measurement accuracy.

Accuracy problems include force measurement accuracy, speed accuracy, deformation accuracy, and displacement accuracy. These precision values ​​can reach up to plus or minus 0.5. But for general manufacturers, achieving 1% accuracy is sufficient. In addition, the force resolution can reach almost 400,000 times.