Frequency conversion drive technology is widely used in rail trains to improve energy efficiency and optimize the operation characteristics of traction system. However, the characteristics of variable frequency drive, such as speed fluctuations, frequent start and stop, and electromagnetic interfere

In mechanical connections, the bolts need to withstand a variety of complex stress environments, including axial tension, shear force, and bending stress. To ensure the reliability of bolts in actual operating conditions, the wedge negative load test (Wedge Load Test) is widely used to assess the be

Bolts play a vital role in the mechanical connection, and their tightening ability is directly related to the safety and reliability of the equipment. In order to ensure that the bolt does not fail prematurely when under axial tension, tensile load test (Tensile Load Test) is a key means to detect i