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What kind of down-the-hole percussion drilling tool
Different from the top hammer impact rock drilling tool, the down-the-hole impact rock drilling tool is a kind of large-diameter drilling and blasting method with compressed air as the power source, and the power part enters the rock hole to drill rock. At present, it is widely used in rock drilling engineering at home and abroad.
What kind of down-the-hole percussion drilling tool
Different from the top hammer impact rock drilling tool, the down-the-hole impact rock drilling tool is a kind of large-diameter drilling and blasting method with compressed air as the power source, and the power part enters the rock hole to drill rock. At present, it is widely used in rock drilling engineering at home and abroad.
The down-the-hole percussion drilling tool is usually composed of drill bit, impactor and drill pipe, which is equipped on the drilling rig (drilling frame) and equipped with air compressor to form the drilling unit. According to the different compressed air pressure used by DTH percussion drilling tools, they are usually divided into three types: low pressure DTH drilling tools (air pressure is 0.6~0.8MPa), medium and high pressure DTH drilling tools (air pressure is 1.0~2.0MPa) and high pressure DTH drilling tools (air pressure is greater than 2.5MPa). Due to the different driving pressure, the drilling efficiency of down-the-hole drilling tools is different, and the performance requirements of the products are also different. Therefore, the product prices of low-pressure down-the-hole drilling tools and medium-high-pressure down-the-hole drilling tools are also quite different.
Market Situation of DTH Impact Drilling Tools in China
At present, the diameter range of low-pressure down-the-hole drill bits is 68~200mm, of which 90~130mm diameter drill bits are used in a large amount. The supporting low-pressure down-the-hole impactor is mainly composed of three specifications: 90 type, 100 type and 150 type. The market price of low-pressure down-the-hole percussion drilling tools is relatively low, and it is one of the preferred products for construction teams with poor domestic small construction projects, individual quarries and rock drilling machinery and equipment. Medium and high pressure down-the-hole rock drilling tool is a medium and large diameter rock drilling tool widely used in open and underground mines, quarries, hydropower projects, water well drilling, mineral exploration, rock cable anchor hole drilling, geothermal excavation and subway engineering excavation side pile support and other construction sites. Its rock drilling tool has a series of characteristics such as fast drilling rate, high hole straightness, smooth hole wall, good rigidity of drill pipe and impactor, etc. High-pressure down-the-hole drilling tool products are very strict in terms of material, mechanical processing, heat treatment process and the overall performance of the product. At present, domestic high-pressure down-the-hole drilling tools are in the research and development stage of product performance and quality. With the continuous improvement of the technical performance index and product quality stability of domestic high-pressure down-the-hole drilling tools, high-pressure down-the-hole drilling tools will have more room for expansion in the domestic and foreign markets.
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