确定挖掘阻力关键因素值与方法的研究

确定挖掘阻力的关键因素是挖掘厚度,而针对爆破后矿堆如何确定挖掘厚度始终困惑设计者.基于具有代表性的实际爆破后矿堆的挖掘过程和挖掘体积与铲斗容积相等的原则,建立挖掘轨迹方程和挖掘厚度的数学模型,运用数学极值理论,求得最大挖掘厚度与铲斗内宽的数学关系,并与实测值相符;还求得整个挖掘过程的挖掘阻力和最大挖掘阻力.针对爆破后矿堆,提出了确定挖掘阻力关键因素值与新方法,为确定其他力能参数提供了可靠依据.

Key Factor Value and Method to Determine Digging Resistance

How to determine the digging depth is the key factor and also a problem which is often difficult to be tackled in determining the digging resistance for the ore piles and the piles after blasting. Based on the typical digging process for a blasted ore pile and the principle that the volume digged by a shovel dipper is equal to the volume of the dipper, a mathematical model is developed of digging depth with an equation of digging path given. Then, the mathematical relationship between the maximum digging depth and inside width of dipper is given on the extreme principle, which is in conformity to the measured values. Furthermore, the digging resistance and its maximum value in the whole digging process are both given. In this way a new method is proposed to determine the key factor value of digging resistance, thus providing a reliable reference for determining other mechanical parameters.