The production of spring testing machines in China has been 50 years old. Early-stage spring testing machines were limited to mechanical structures and analog measurements, and accuracy was limited. In recent years, with the development of science and technology, enterprises have established low, medium and high-grade product lines through industry cooperation and production and research cooperation on the basis of absorbing domestic and foreign advanced technologies. The test function has also been extended from the original single tension test to the ability to measure a variety of spring characteristics. Six different detection methods such as static tension, static torsion, high frequency tensile fatigue, low frequency tensile fatigue, torsional fatigue, and on-line detection have been developed, as well as mechanical, electronic, electromagnetic, electro-hydraulic, electrical, There are six different loading modes, such as electro-hydraulic servo type; the range is from more than 170 kinds of products with different specifications from lN to 500kN.

The spring tension and compression testing machine described in this paper has three main purposes:

a) measuring the spring modulus of the spring (spring stiffness);

b) applying a specified test force to the spring to measure the deformation (elongation or torsion angle) produced by the spring under the test force;

c) The spring is subjected to a specified deformation (elongation or torsion angle) to measure the force or torque experienced by the spring.