Comparative analysis of electro-hydraulic servo and manual hydraulic universal testing machine

Universal testing machine is a product with sales and trust since Jinan Hengsi Shanda Instrument Company's production and manufacturing experimental equipment. Universal testing machine can be divided into manualHydraulic universal testing machine, electro-hydraulic servo universal testing machine, our company's technicians have described the characteristics of these two universal testing machines in detail.

1. Electro-hydraulic servo universal material testing machine

This type of test machine is currently a kind of test machine with better performance. Because it adopts electro-hydraulic servo control technology, it can achieve closed-loop control of force, displacement, and deformation, and has good control performance. Currently, it is used in places such as metals and building materials that require constant stress, constant strain and creep testing, but due to the limitation of oil source flow, its test speed is relatively low. In order to increase the system stiffness and ensure stable operation of closed-loop control, this type of test machine has a small stroke, complex operation, and difficult to expand and configure. There are few models below 10KN, so it is not suitable for testing plastic rubber materials.

2. Manual hydraulic universalMaterial testing machine

This type of test machine is the "ancestor" of the test machine family. It has a long history, is simple to use, is cheap and has a large tonnage. As the name suggests, manual hydraulics indicate that it is open-loop control, with poor performance and the operation process depends entirely on the operator's operating level. In addition, due to its mechanical structure and hydraulic loading principle, its loading speed is relatively small. Currently, the small model of this type of test machine is 50KN, so its small load measurement accuracy is very low and its expansion configuration capability is poor. It is generally only used when conducting structural component tests or simple material performance tests, such as the pull-off of connecting parts, the tensile strength of steel bars, etc.

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