Crankshaft bending torsion combined load test device

Abstract

The invention discloses a crankshaft bending torsion combined load test device. A rack serves as a support, and a sliding rail, a lifting appliance, a bending clamp, a torsion clamp, a vibration exciter, a motor, an eccentric wheel and an electric control cabinet (comprising a power amplifier, a function generator and a dynamic strain gauge) are arranged in the rack. According to the invention, atorsion clamp and a bending clamp are lifted through a lifting appliance and a sliding rail, a crankshaft sample piece is fixed through the bending clamp and the torsion clamp, so that a proper test position is obtained on the rack, a vibration exciter vibration rod drives the torsion clamp to apply pulsating torque to the crankshaft, and the motor and the eccentric wheel drive the bending clamp to apply alternating bending moment to the crankshaft. During testing, frequency and amplitude signals are set and pass through the signal generator and the power amplifier, the vibration exciter and the motor are driven to output, so that the crankshaft is forced to vibrate, the output power is further adjusted and the vibration frequency is changed after resonance is realized, and the fatigue strength condition of the crankshaft is judged and analyzed through data of the strain gauge.

Description

technical field

[0001] The invention relates to a crankshaft bending and torsion composite load test device, in particular to a crankshaft bending and torsion composite load test device which can independently apply pulsating torque and alternating bending moment to the crankshaft at the same time to carry out the crankshaft fatigue simulation test. Background technique

[0002] At present, the known structure of the crankshaft bending and torsion test bench is formed by connecting a support stand, a hanger, a bending fixture, a torsion fixture, an exciter, and an electric control cabinet. Through the excitation signal generated by the exciter, the vibrating rod drives the bending fixture and the torsion fixture to apply pulsating bending moment and torque to the crankshaft. However, under the actual stress state of the crankshaft, the torque is a pulsating load and the bending moment is an alternating load. The alternating bending moment load cannot be generated only by the...

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