Abstract
With regard to the severe vertical and pitching vibration of shearer in actual working conditions, the vertical–pitch coupled dynamics model of shearer with 13 degrees of freedom was established using multi-body dynamics theory. Based on the elasticity theory, Hertz contact and collision dynamics, the connection stiffness model of shear body and the traction section, the rocker arm with clearance and the traction section, the support stiffness models for the guide shoe and the smooth shoe, and the stiffness characteristics model of the rocker arm were constructed respectively. Taking into account the convergence of solution process and the reliability of results, a modified drum load was proposed as the external excitation of the system and the dynamic characteristics of key parts of shearer under different working conditions were analyzed. The numerical models were validated against the vibration responses of the whole machine and critical components of shearer obtained from mechanical test under different operating conditions. The research results provide theoretical basis for the structure optimization and process parameter optimization of shearer.
Highlights
At present stage, coal mining methods are developing from mechanization to intelligent and unmanned
J ia11,12 established a coupled dynamics model of the transmission system of cutting part and the rocker arm shell based on an improved gear mechanics model, analyzed the dynamic response of the system under different loads, and obtained influence law of topology optimization of the shell on the characteristics of the gears. Liu13,14 proposed a torsional dynamics modeling method for planetary gears, established the electro-mechanical coupling dynamics model for cutting part transmission system
Obtained the dynamics response influence law of traction speed and drum load on that system via analysis method. Ge15 established the electro-mechanical coupling dynamics model for the cutting unit transmission system, analyzed the dynamic characteristics of the system under impact load and proposed an active control strategy of motor torque compensation to suppress the dynamic loads caused by external loads with catastrophe characteristics. Yang16 established the vertical dynamics model for the cutting part of the shearer and analyzed the influence of the support characteristics of the height-adjusting cylinder on the vibration characteristics of the system
Summary
Coal mining methods are developing from mechanization to intelligent and unmanned. Corrected drum loads were proposed as the external excitation, the dynamic characteristics of key parts of the shearer were analyzed and experimental method was utilized to verify the accuracy of the established model and the solution results. In the description process of the shearer dynamics model, it is assumed that the traction part is connected with both the walking box and the supporting part under fixed stiffness values, and the influence of the dynamic characteristics of the scraper conveyor on the shearer system is not considered.
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