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精梳机钳板机构是一平面二自由度七杆机构,运用机构弹性动力学理论分析该机构的低阶谐振现象,并探索其成因。结合钳板机构的实际工况建立动力学方程,利用振型叠加法求解,分析其低阶谐振现象。构建四种方案,从刚体惯性力、加压弹簧恢复力、冲击力三个方面探索钳板机构低阶谐振的成因。结果表明:钳板机构产生低阶谐振的主要原因是加压弹簧恢复力唤起的前三阶振型的简谐共振,刚体惯性力对谐振点响应没有作用但会影响机构的响应值,冲击力对机构响应值以及谐振点响应的影响都不大。
The combing machine nipper mechanism is a planar two-degree-of-freedom seven-bar mechanism, which analyzes the low-order resonance phenomenon of the mechanism by using the mechanism of elastic dynamics and explores its causes. Combined with the actual working conditions of the nipper mechanism, a dynamic equation is established, and the mode shape superposition method is used to solve the low-order resonance phenomenon. Four schemes were constructed, and the causes of lower-order resonance of the nipper mechanism were explored from three aspects: inertial force of rigid body, restoring force of pressurized spring and impact force. The results show that the main reason of the low-order resonance of the nipper mechanism is the simple harmonic resonance of the first three modes induced by the restoring force of the compression spring. The inertial force of the rigid body has no effect on the resonance point but affects the response of the mechanism. The response of the mechanism as well as the resonance point has little effect.