Muck discharge device for pneumatic down-the-hole hammers

The utility model provides a muck discharge device for pneumatic down-the-hole hammers. The waste discharge device comprises a pneumatic down-the-hole hammer, an air compressor, a muck discharge barrel, and a moving plate; the air compressor discharges compressed air to drive muck to move; the muck discharge barrel is arranged above an impactor of the pneumatic down-the-hole hammer; the top end of the muck discharge barrel is provided with a muck entry which is arranged in a borehole to be drilled and which is lower than an opening of the borehole to be drilled; the bottom of the muck discharge barrel is provided with a muck exit; the moving plate whereby the muck exit can be closed and opened is disposed at the bottom of the muck discharge barrel. The muck discharge device for pneumatic down-the-hole hammers has the advantages that moving range of the muck is narrowed, flow of the compressed air is decreased, air supply of the air compressor is increased, muck discharging requires less power, drilling cost i