Flexural fatigue testing machine for multi-throw crank shaft

Abstract

The invention relates to a flexural fatigue testing machine for a multi-throw crank shaft, which comprises a working platform, displacement sensors, electromagnetic vibration exciters, a portal frame, counterweight blocks, a signal controlling and processing system and the like. The portal frame, a spring supporting seat and the electromagnetic vibration exciters are fixedly arranged on the working platform; the portal frame is connected with two ends of the multi-throw crank shaft through two tension springs; a main shaft in the middle section of the multi-throw crank shaft is connected withthe spring supporting seat through a compression spring; each crank shaft arm of the multi-throw crank shaft is respectively and fixedly provided with a crank shaft arm clamp body; the counterweight blocks are respectively and fixedly arranged on each crank shaft arm clamp body; two electromagnetic vibration exciters are symmetrically arranged at the two ends of the multi-throw crank shaft, further, armatures of the two electromagnetic vibration exciters are fixed with two counterweight blocks at the outermost ends of the multi-throw crank shaft; the displacement sensors are fixedly arranged on the counterweight blocks; and the two electromagnetic vibration exciters and the displacement sensors are synchronously connected with the signal controlling and processing system through conducting wires. The flexural fatigue testing machine for the multi-throw crank shaft has a simple structure, convenience in operation, high precision and small error, and is applicable to the flexural fatigue testes of crank shafts of different models.

Description

technical field [0001] The invention relates to a multi-turn crankshaft bending fatigue testing machine, which belongs to the field of crankshaft bending fatigue testing. Background technique [0002] The safety and reliability of mechanical products are important indicators of the technical level. The reliability and failure issues within the product design life have an important impact on human production and life, so they have been widely concerned by people. The crankshaft is a key bearing part of the internal combustion engine, and one of the main contents of its reliability is its bending fatigue problem under the action of high cycle fatigue stress. Carrying out research on the reliability technology of multi-turn crankshaft components is of great significance to the development of engines in my country. Due to the complexity of the crankshaft fatigue problem, there are still many limitations in the current technical level to analyze the reliability of the crankshaft...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low working efficiency, poor stability of continuous operation, and large error of test results in the existing crankshaft bending fatigue testing machine, and to provide a multi-turn crankshaft capable of simultaneous testing of multiple turns and high-frequency resonance Bending fatigue testing machine

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