Buy pulling machine has always been a troublesome thing, the face of many similar products on the market, do not know that the manufacturers of the products is really high-quality products, the product is suitable for their own products.If you master these considerations, in the face of how to choose such as tensile machine, you should be able to easily solve.
　　Buy tensile machine to consider the test material tensile
　　The larger the machine, tensile testing machine load volume, and the smaller the load cell has a higher accuracy, of course, the the machine greater the more expensive price.Tensile machine is not the bigger the better.But to adapt to the size of the force range.Sensor market is divided into imported and domestic.Made of the sensor is relatively cheap, but the accuracy is poor will have zero drift.On the contrary, imported sensors, high precision, good repeatability, but the price is more expensive.Tensile testing machine the most important part is the sensor, test the power of the sensor output signal to the processor, if the output signal is not accurate, then processing the data certainly will not be permitted, pulling machine lost the ability of tests of controls.
　　To pay attention to the elements, experimental stroke also buy tensile machine　
　　The tensile machine comes with the displacement measurement system simply measure the distance of the tensile machine crosshead.If the elongation requirements, such as measuring the elongation of the rubber products, is charged separately with large deformation test stand and large deformation extensometer for metallic materials elongation is relatively small plus small deformation extensometer (metal extensometer).Became pale, small deformation (metal extensometer) is the absolute displacement of the test sample in the stretching process between two points, with higher accuracy. Selection, small sample volume, and the Rally optional Model: single-column tensile machine according to the size of their companies need to test products.Sample volume, pull the need to double-column tensile testing machine, the general tensile machine stroke 600MM.The material elongation of more than 1000% can choose to use of Stroke 1000 or 1200mm
　　, Tensile testing machine test speed should be taken into account
　　Market and some 50 to 500 mm / min, some 0.001 to 500 mm / min, the former general use the ordinary trapezoidal screw plus speed motor or variable speed system, lower cost, greater wear and tear.A long time, the test will produce a joint board shake affect test accuracy, and time soon, machine noise, easily broken.The latter using the servo system to increase with the ball screw, high accuracy, speed constant speed stability, wear, and better durability.Test repeatability test out good.The standard has specified test conditions, what material how much speed, because the speed is not the same as the force measured values ??are not the same.Test much, not force the election ordinary trapezoidal screw a plus speed motor or variable speed system is more economical and practical.
　　, Tensile testing machine measurement accuracy should pay attention to the
　　Accuracy issues, including force measurement accuracy, speed, accuracy, precision deformation, displacement accuracy.When you purchase combined with their own needs, high precision, require special attention to this point.
　　, Tensile testing machine manufacturers standard
　　The intelligent three basic configurations: host microcomputer, printer, if the microcomputer function, you can print.It may also be equipped with an ordinary computer, perform complex data analysis, such as data editing, partial enlarged adjust the report forms, statistical analysis into a set of specifications.With computer manufacturers will be added to the corresponding control system.
　　Concerned about the tensile machine output　　
　　The output results of the test results can be arbitrarily set: is most vigorously value, elongation and tensile strength, concentration elongation, elongation force value, yield strength, modulus of elasticity, the maximum test force.It can be said that the operation of the microcomputer when the output of the most comprehensive results.Some foreign manufacturers of products, the general output 8.Some domestic manufacturers can output 5-6, some manufacturers can only output the maximum force value, average, minimum three.
　　Note tensile machine to buy products machinery configuration　
　　Drive, screw drive and rack drive, the former is expensive for high-precision, high repeatability test; latter cheap, low accuracy, low test repeatability.Screw tensile precision measurement have a decisive role.The ball screw, lead screw, screw., Ball screw highest accuracy, but the performance of the play is to rely on the computer servo system operations to play, the package price is also more expensive.General screw and trapezoidal screw can achieve the required accuracy in flexible packaging, 0.5-1% accuracy.Transmission, gear and chain drive, the former is expensive for high precision; latter cheap, low accuracy.Sensor, the main cost is that life, photoelectric sensors is one of the more advanced technology, and generally available for more than one hundred thousand times. 8, optional factory service concern
　　Longer-lasting after-sales service is more effective protection after you purchased the product, the purchase of tensile testing machine products, not just freeloaders fixture from the manufacturer of the scale, the strength of the company, technology maturity, (tensile machine an important part to affect the test results, even if the preparation of the tensile testing machine and then re-accurate sensor, if the sample is held loose, inaccurate or access point will be greatly reduced the test data, so choose experienced manufacturers can not be ignored) service outlets, the warranty period, the preparation of structure ...... many other considerations, the final choice to the higher cost of manufacturers.
　　
　　The article source http://www.bangtest-china.net/  of Bang Instrument CO.,LTD