Analyze how to determine the sensitivity of the tensile machine
Universal material testing machine and tensile testing machine are referred to as tensile testing machine for short. This kind of equipment is specially designed for various industries to test various metals or non-metals and various composite materials. Test and analyze their maximum experimental value and fracture value. Precision instruments such as data. It can be said that the tensile machine is an indispensable equipment in various industries, so the sensitivity of the tensile machine is very high, which directly affects the accuracy of the results of the test object, so how to measure the sensitivity of the tensile force? www.lyxyantech.com Let me have a look next.
It can be known from the mechanics of materials that under small deformation conditions, the strain ε of an elastic element at a certain point is proportional to the force experienced by the elastic element, and also proportional to the degree of elastic deformation. Let's take the S-type sensor as an example. When the S-type sensor is subjected to a tensile force P, the strain gauge is attached to the surface of the elastic element. Since the strain of the elastic element is proportional to the external force P, the strain gauge is connected to the measurement circuit , You can measure the force by measuring its output voltage. www.lyxyantech.com
Generally speaking, the output signal of the sensor is generally very weak, usually only a few mV. If we directly measure this signal, it is very difficult and cannot meet the requirements of high-precision measurement. Therefore, it must be This weak signal is amplified, and the amplified signal voltage can reach 10V. The signal at this time is an analog signal, this analog signal is converted into a digital signal through a multiplexer and an A/D conversion chip, and then the data is processed. At this point, the force measurement comes to an end. There are two chucks on the device, which are connected to the photoelectric encoder mounted on the top of the measuring device through a series of transmission mechanisms. When the distance between the two chucks changes, the shaft of the photoelectric encoder is driven to rotate, and the photoelectric encoder There will be pulse signal output. The signal is processed by the single-chip microcomputer, and the deformation of the sample can be obtained. Touch key operation mode, real-time display is convenient and quick on the monitor. The beam can be adjusted quickly and slowly when the specimen is clamped, and has functions such as overload protection.
The tensile machine has a wide and accurate force measurement range and loading speed, and has high accuracy and sensitivity in the measurement and control of deformation, displacement, and load. It can also perform automatic control of constant velocity loading, constant velocity deformation, and constant velocity displacement. Test, and have the functions of low-cycle load cyclic reciprocating, deformation cyclic reciprocating, and displacement cyclic reciprocating. www.lyxyantech.com