Precautions for Purchasing Universal Tensile Test Machine

Universal tensile testing machine principle is Mechatronics design, which is composed of the main part, mechanical part, hydraulic system, force measuring system, etc. the force measuring system is mainly composed of force measuring sensor, transmitter, microprocessor, load driving mechanism, computer and color inkjet printer.

The tensile range of the material to be tested shall first be considered.

The different tension range determines the different sensors used and the structure of the universal tension test machine, but this item has little impact on the price. For general flexible packaging manufacturers, the tension range of 100 Newtons is enough. Therefore, the single-arm type is OK.

Corresponding to the single-arm structure is the portal structure, which is suitable for relatively large tension, such as one ton or more. Therefore, flexible packaging manufacturers do not need it.

The problem of test stroke.

Select the type according to the nature of the items that your company needs to test. For example, when testing the items with large elasticity and long length, you should communicate with the manufacturer's technical department in advance when ordering the universal tensile test machine.

Standard configuration problem.

Three basic configurations of intelligence: host, microcomputer, and printer. If the microcomputer has a strong function, it can print directly. In addition, ordinary computers can also be equipped. The data can be edited and analyzed in the form of complex data, such as group analysis and local analysis. If equipped with a computer, the manufacturer shall add a corresponding control system.

Output results.

The output results can be set arbitrarily: 8 items: maximum force value, elongation, tensile strength, constant force elongation, constant elongation force value, yield strength, elastic modulus, and maximum test force. This can be said to be the most comprehensive result of microcomputer operation.

In experimental projects.

Flexible packaging requires a universal tensile test machine with multiple functions, that is, based on different fixtures, it can be used for tensile, compression, bending, tearing, shearing, 180 degrees peeling, and 90-degree peeling tests.

There are some high-end tension machines on the market. In addition to the above items, they can also test the friction coefficient because of their high sensor accuracy (some reach one in 350000).

Main configuration of production machinery.

Transmission, including lead screw transmission and rack transmission. The former is expensive, used for high precision and high test repeatability; The latter is cheap, used for low precision and low test repeatability.

The lead screw plays a decisive role in the measurement of tension accuracy. Generally, there are ball screws, trapezoidal screws, and general screws. Among them, the accuracy of the ball screw is the highest, but its performance depends on the operation of the computer servo system, and the price of the whole set is also relatively expensive. Using a general lead screw and trapezoidal lead screw can achieve the accuracy required by flexible packaging, that is, 0.1-1% accuracy.

The main cost of the sensor lies in its service life. Photoelectric induction is one of the more advanced technologies, which can be used more than 100000 times.

Test speed.

Some universal tensile test machines are 10 - 500 mm / min and some are 0.001 - 500 mm / min. the former generally uses an ordinary speed regulation system, which has low cost and rough influence on accuracy; The latter uses a servo system, which is expensive and has high precision. For flexible packaging enterprises, it is enough to select a servo system with a speed regulation range of 1 - 500mm / min, which will not affect the precision and the price is within a reasonable range.

Measurement accuracy.

Accuracy problems, including force measurement accuracy, velocity accuracy, deformation accuracy, and displacement accuracy. These precision values can reach a maximum of plus or minus 0.5. But for general manufacturers, 1% accuracy is enough. In addition, the force resolution can almost reach 1 / 400000.

If you are looking for universal tensile testing machine manufacturers, we hope to be your choice.