特殊用法auger-type grate concave1.螺旋式栅格凹板blank concave1.无钉齿凹板块［组］channel bar concave1.槽杆式凹板closed type concave1.闭式凹板； 无孔凹板double concave1.双凹grate -type concave1.栅格式凹板gird -type concave1.栅格式凹板lattice-type concave1.栅格式凹板open-type concave1.栅格式凹板moving concave1.活动式凹板rethresher concave1.复脱［除芒］器凹板， 二次脱粒器凹板spike-tooth concave1.钉齿式凹板wire-rod concave1.钢丝 网筛式凹板