Down-the-hole rock tools(drilling tools) are rock drilling equipment which takes compressed air as power source to partially transfer impact power into drilling holes. An air distributing device in a top hammer controls a piston to move back and forth. An impact device arranged in the front of the top hammer transfers the impact powder to a down-the-hole bit to crush rocks.
        Currently, the down-the-hole rock tools(drilling tools) are wildly used in the construction sites of surface drilling, underground drifting and tunneling, rock quarries, power and water projects , Water well drilling, mineral prospecting, cable bolting hole drilling, subterranean heat drilling, side piling support drilling in metro projects, etc. The rock drilling companies highly regard the down-the-hole rock tools(drilling tools), because the down-the-hole rock tools(drilling tools) have the advantages of high hole straightness, smoothness of hole walls, good steel grade of drill rods and hammer, no rely on high axial push, no limit of hole deepness, low equipment investment, convenient maintenance, etc. Especially in the construction sites of drilling blast holes with the diameters of 110mm to 254mm, the high-pressure Down-the-hole rock tools(drilling tools) are especially used wildly.