Abstract: Analyzed the reason of high broken rate of washed lump coal in Dalong coal preparation plant,described the application effect of the extendible chute that prevent lump coal from broken in the process of coal binning.Production result show that the chute effectively resolved the problem of lump coal broken during operation of binning,the undersize fraction reduced from 15.2% to 10.3,decreased by 4.9%,also realized automatic control of binning,which reduced the labor intensity of workers and lower the noise and dust pollution.