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Classification of press
Press according to the test method is divided into test press and press press, according to the control is divided into electric, manual, electro-hydraulic servo press
1 electric press, mainly for the pressure value of the test, which is driven by the motor, with data acquisition and processing, the pressure value on the screen, for product research or quality control. Such as QT-1170B, QT-1136
2 manual hydraulic press
Manual hydraulic press can be used as product testing, can also be used for products, accessories, press, assembly. The high pressure oil source is used as the power source, and the manual control valve is used as the control element, and the manual control is realized. Due to the limitation of the oil flow and the structure of the main engine, the piston stroke of the oil cylinder is small, and the common one is about 300mm. By the impact of price factors, the force sensor is generally used pressure sensor (large tonnage basically use pressure sensor). Thus, the accuracy is low, the range is small, the general accuracy of 1 or 2, the range is generally 4%-100%F.S. Affected by the friction of the cylinder, the tonnage is generally very difficult to achieve a minimum of 5T. However, due to its unique characteristics of low price and large tonnage, at present, in the finished product testing, a single material index is still a large number of tests. YES-2000
3 electro-hydraulic servo press
It is mainly used for precision high pressure oil source as the power source, the use of servo valve or proportional valve as a control element for the closed-loop automatic control, so the control performance is high, generally three kinds of control mode to achieve load, strain, displacement. The same as manual hydraulic press, the flow rate of oil source is limited, the test speed is low. Because of the closed loop automatic control, the stiffness of the system becomes the key to the normal operation of the whole system. As everyone knows, the stiffness of the liquid is relatively low, in order to minimize the effect of liquid on the stiffness of the general electro-hydraulic servo testing machine stroke is not large, also affected by the stiffness of the electro-hydraulic servo testing machine tonnage are unlikely to do is very small, basically in a tons. However, because of its various control modes, it has the characteristics of flexible use and high performance. YAW-2000

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