采煤机液压调姿牵引机构的力学特性与设计

The mechanical properties and design of shearer hydraulic adjustable posture traction mechanism

为改善采煤机整机受力状态、优化导向滑靴导向支撑方式、降低牵引机构故障率、增强采煤机工作的安全性和可靠性,针对传统采煤机牵引机构特点,提出一种采煤机液压调姿牵引机构.给出了主要结构参数的设计计算方法,建立了液压调姿牵引机构的力学模型,确定了牵引机构传动箱壳体摆角范围为0-10°和实现机身调姿范围为0-30mm,并分析了牵引负载变化对液压调姿牵引机构主要设计参数的影响.结果表明：当支撑点分别处于最高（θ=0°）和最低位置（θ=10°）时,牵引负载和油液可压缩性引起的相应牵引传动箱壳体摆动角度最大变化量分别为0.178°和0.0754°,支撑点高度最大变化量分别为0.009 5mm和0.447mm.研究表明,机身姿态受牵引负载变化和油液可压缩性共同作用的影响较小,液压调姿牵引机构可以满足对外负载变化的刚性需求.研究结果为采煤机液压调姿牵引机构的工程应用设计提供理论基础.

In order to improve the shearer stress state, optimize the support method of guiding sliding boots, reduce the failure rate of traction mechanism and enhance the safety and reliability of shearer, a shearer hydraulic adjustable posture traction mechanism against the traditional traction mechanism characteristics was presented. The main structural parameter calculation method was obtained and the mechanical model of hydraulic adjustable posture traction mechanism was established. The adjustment range of shearer fuselage was determined at 0-30 mm and the transmission case shell angular range was determined at 0-10°. And the impacts of the change of tractive on the main design parameters of hydraulic adjustable posture traction mechanism were analyzed. The result showed that due to the change of tractive and the compressibility of hydraulic oil, the maximum value of the angular range of transmission case shell was 0. 178° and 0. 0754° when support points in the highest （θ=0°） and the lowest position （θ=10°） respectively, and the measure of the change point height was 0. 009 5 mm and 0. 447 mm. The research indicated that the impacts of the change of tractive and the compressibility of hydraulic oil on shearer posture were small. The study provides the basis for the subsequent research of the shearer hydraulic ad- justable posture traction mechanism.