Our common traction machine (tensile testing machine) is not only classified according to the type of material (e.g.: rubber traction machine, metal traction machine, etc.), but also classified according to its own structure:
Simple tensile testing machine
Because the tensile strength of plastic is a very important index for examining the mechanical properties of plastics, there have not been many kinds of plastics in recent years, and the application of tensile machines has not been very widespread At that time, the mechanical performance test items of tractors in plastics were relatively individual, and the related standards were not very perfect. It can only be used for a single tensile test, and the data it can handle is very limited, and the control and measurement accuracy is relatively low, althoughl it is still used in some cases, such as the steel wire traction machine, for its sole function has been gradually eliminated from the market.
Electro-Hydraulic Servo Tensile Testing Machine
This type of testing machine is a kind of tensile material with currently better performance The testing machine can, as it adopts electro-hydraulic servo control technology, realize closed-loop control of force, displacement and deformation, and has good control performance. At present, it is widely used in metals, building materials, etc., which require constant load, constant strain and creep tests. However, due to the limitation of oil well flow, its test speed is low. In order to increase the rigidity of the system, the tractor is equipped with a digital displayge ensures the stable operation of closed-loop control. The stroke of this type of testing machine is small, the operation is complicated, and the expansion configuration is difficult. Because there are few models under 10KN, so it is not suitable for plastic and rubber materials .
Manual hydraulic tensile testing machine
This type of tensile testing machine is the ancestor of the tensile testing machine family, it has a long history has a long history, easy to use, low price and large tonnage. The manual hydraulic pressure shows that it is an open control, the performance is not good, and the operation process is entirely dependent on the operator's operation level. In addition, the test stroke is small because its mechanical structure and hydraulisches loading principle determine his loading speed.
Currently, the smallest model of this type of tensile testing machine is 50KN, so the accuracy of measuring small loads is very low, and the strain configurability is very bad, typically used only in structural member testing or simple material performance testing, such as B. Breaking off of connecting parts, tensile strength of steel rods, etc.
Electronic closed loop tensile testing machine
This type of testing machine has a wide speed range of traditional electronic testing machines Tensile testing machine, the test stroke is large, the configuration is flexible, and has the advantages of the force value, displacement and deformation control of the servo testing machine. Therefore eIt's a tensile testing machine with better performance, but machine stability is closely related to the rigidity of the main machine and the rigidity of the specimen when performing force and deformation control. In general, the tonnage of plastic testing machines is small, so the rigidity of the main machine is small, and the rigidity of the sample itself is not too large, so this type of tensile testing machine rarely has models below 10KN, but models below 10KN plastic class are the most commonly used.
Traditional Electronic Tensile Testing Machine Tensile Testing Machine
This type of tensile testing machine uses a servo motor as a drive source. Bolts and nuts are used as actuators to realize the speed control of the moving beam of the testing machineren. The operation is simple and the demands on the test device are not high. The test stroke can be adjusted as required. Its control precision and control range are very high and wide.
Vertical If you look at the relevant standards for testing the mechanical properties of plastics, the requirements for the control type of tensile testing machines are almost exclusively speed control. Therefore, this is independent of the control type, speed range, test stroke and testing machine tonnage. The type of tensile testing machine is the selection of the mechanical properties test.
Wuhan Guoliang Instrument is a tensile machine manufacturer specializing in the production of electronic tensile testing machine, universal tensile testing machine and other testing instruments.Recognizable materials include: rubber, plastic, metal, geotextilen Wait, welcome to consult!