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How to choose and purchase universal material testing machine effectively

Source: Tensile testing machine August 15, 2018 Keywords: Universal testing machine testing machine    

     Universal testing machine It is divided into electronic universal testing machine and hydraulic universal testing machine; electronic universal testing machine and hydraulic universal testing machine belong to material mechanics testing instruments, but they have their own characteristics in structural design, performance, application scope and so on. Users can determine the choice of industrial electronic universal testing machine and hydraulic universal testing machine according to the specific use environment.    
Electronic universal testing machine is widely used in tensile test of various metal, nonmetal and composite materials, such as wood, plastic materials, wire and cable, paper, film, rubber, medicine, food packaging materials and other fabrics, All kinds of test data processing software and test accessories can be customized according to the domestic and foreign standards provided by users. Digital electronic universal testing machine is only suitable for users with strength, tensile strength, compressive strength and other related data. If the parameter requirements are complex, the microcomputer controlled electronic universal testing machine is a better choice.
The electronic universal testing machine is not an oil source, so it is cleaner and more convenient to use and maintain; its test speed range is adjustable, the test speed can reach 500mm, the test stroke can be determined according to the needs, which is more flexible; the precision is high, some can even be achieved; the volume is small, the weight is light, and the space is large, It is convenient and equipped with corresponding equipment to do mechanical tests of various materials. At present, the domestic mainstream testing machine manufacturers can realize closed-loop control such as load control, strain control, displacement and speed control.
The hydraulic universal testing machine is limited by the flow of oil source, and the test speed is low. The manual hydraulic universal testing machine is easy to operate and low in price, but the control precision is low; the electro-hydraulic servo universal testing machine and the performance gate digital electronic universal testing machine have the same control accuracy except for the low speed.
The load sensor of electro-hydraulic servo universal testing machine controlled by microcomputer has a force accuracy of 0.5%, which is more reliable, more stable and more cost-effective in large tonnage material mechanics experiments.
The electronic universal testing machine mainly uses servo motor as the power source and screw and screw as the actuator to realize the speed control of the test mobile beam. The transmission control mainly includes synchronous belt and reducer, and the electronic universal testing machine adopts load sensor.
The hydraulic universal testing machine mainly uses high-pressure hydraulic power source as the power source, and uses manual valve, servo valve or proportional valve as the control element for control. The universal hydraulic universal testing machine can only be loaded manually and belongs to the open-loop control system. Affected by the price factor, the sensor generally adopts the hydraulic sensor. The electro-hydraulic servo universal testing machine adopts servo valve or proportional valve control, Some manufacturers in China use high-precision load cells to measure forces.

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