前驱轮式沥青路面冷铣刨机牵引性能试验

Traction performance experiment of asphalt cold milling machine with front-wheel driving

分析了铣刨阻力与前后轮有效附着重力、切线牵引力、滑转率、行走功率和铣刨功率间的关系,进行了某前驱轮式冷铣刨机牵引性能试验.结果表明：实心轮胎与沥青路面间的滚动阻力系数和附着系数分别为0.02,0.65;行驶阻力占最大牵引力的比例约为7.1%,铣刨阻力水平分力为切线牵引力的主要部分,滑转率随铣刨阻力水平分力增大而增大;分别采用高斯拟合和二次多项式拟合得到了滑转率与切线牵引力在滑转率全区段及0~26%时的拟合方程;滑转率在4%~24%时牵引效率均大于70%且铣刨机工作状态稳定;最大牵引效率下的滑转率为10%,可作为该试验样机额定滑转率,且额定滑转率下的牵引力输出应与平均铣刨阻力相对应,24%可作为其最大稳定工作滑转率.

The relationship among milling force,valid adhesion weight of front-rear wheels,tangent traction force,traction power and milling power was analyzed. The traction performance experiment of one asphalt cold milling machine with front-wheel driving was conducted. The results show that rolling resistance coefficient between solid tyre and asphalt pavement is 0. 02,and the attachment coefficient is0. 65. The traction resistance force accounts for 7. 1 percent of the largest tangential traction force. The milling horizontal resistance force is the main tangential traction force,and the slipping rate increases with the increasing of milling horizontal resistance force. The fitting equations of slipping rate and tangential traction force are obtained by Gaussian fitting in the whole region of slipping rate and by quadratic polynomial fitting with slipping rate from 0 to 26%. The traction efficiency is above 70% when the slipping rate is from 4% to 24%. The rated slipping rate is 10% for the maximal traction efficiency,and the traction force under rated slipping rate should correspond to average milling force. The maximal stable working slipping rate is 24%.