A transmission arm fatigue testing machine

Abstract

The invention discloses a transmission arm fatigue testing machine, which comprises a support frame, a metal guide frame, a universal drive disc and an acoustic emission probe; a metal guide frame is placed horizontally on the support frame, and a turntable is installed on the bottom of the metal guide frame, and a metal The top of the guide frame is equipped with a universal transmission plate, and the metal guide frame is also equipped with a driving rod and a connecting rod through a connecting block. The other end of the driving rod is connected to the turntable, and the other end of the connecting rod extends upwards and is connected with a transmission Rod and operating arm, the operating arm is connected with the specimen through the connecting plate, and the specimen is fixed on the top of the supporting frame; the supporting frame is also equipped with a control and display system, the connecting plate is equipped with an acoustic emission probe, and the turntable is driven by the driver . The invention has low manufacturing cost, complete function set and relatively high precision.

Description

technical field [0001] The invention belongs to the field of fatigue testing of bridge structures, in particular to a transmission arm type fatigue testing machine. Background technique [0002] With the development of the economy, the volume of vehicle traffic is increasing day by day, prompting my country to build more long-span bridges on large rivers, and the main girders of long-span bridges are mostly steel structures. Under the frequent action of vehicle loads, the steel Fatigue research issues are increasingly important. [0003] At present, most of the large-scale metal material fatigue tests are completed by the American MTS (full name is mechanical testing and simulation) hydraulic servo fatigue testing machine. The basic working principle of MTS is to provide the corresponding tensile and compressive loads to act on the specimen according to different requirements of the experiment. The MTS system has high precision and a wide range of applications. However, the ...

AI Technical Summary

Problems solved by technology

[0006] 1. Fatigue testing machines mostly use the inertial force generated by the periodic rotation of the eccentric body to provide the test piece with an active load. The mass of the eccentric body is limited by the limit of the space and is small, so the load range generated by the testing machine is very small. The scope of the experiment is small

[0007] 2. The direction of the inertial force generated by the periodic rotation of the eccentric body is constantly changing, and it is directly loaded on the specimen, resulting in a constant change in the magnitude and direction of the force. The peak value of the load is the parameter set by the fatigue testing machine, which affects the fatigue. Accuracy of loading width

[0008] 3. The actual vehicle load is highly random, while the conventional fatigue testing machine can only provide periodic constant amplitude loading, which does not conform to the actual situation, thus affecting the accuracy of the fatigue test

[0009] 4. The conventional fatigue testing machine control system can only shut down the machine when the number of loading cycles is set, and cannot monitor fatigue cracks in real time. According to the crack generation status, the interactive shutdown machine is simple in form and single in function

Images