The essence of DTH drilling is to submerge the impactor into the hole during the drilling process to reduce the energy loss caused by the impact work transmitted by the rod, thereby reducing the influence of hole depth on the drilling efficiency. The drilling equipment for DTH drilling is a DTH drilling rig, and YQ-80, YQ-100 and QZ-165 models are commonly used in underground mines in China. Why use DTH drilling rigs, and what exactly is DTH drilling rigs?
　　
　　 DTH drilling rig is an impact rotary drilling rig, its internal structure is different from ordinary rock drills, gas distribution and piston reciprocating mechanism are independent, that is, impactor. The front end is connected directly to the drill bit and the rear end is connected to the drill pipe. When drilling, the impactor enters the hole, the piston (hammer) of the impactor reciprocates to the shank through the gas distributor (valve), and the drill bit hits the rock at the bottom of the hole. The high-speed rotation of the impactor in the hole is achieved by an independent rotation mechanism, that is, by an electric motor or pneumatic rotation device outside the hole by a drill pipe connected to the rear end of the impactor. The rock powder produced during rock drilling is washed by the feng shui mixture gas, which is injected into the impactor from the center of the drill pipe through the powder discharge mechanism, and passes through the groove of the impactor cylinder to the bottom of the hole. Enter.
　　
　　Drilling rigs are divided into two types of rock drills and drilling rigs, with the difference between open drilling rigs and downhole drilling rigs. Rock drills with a diameter of 20-100 mm and a depth of 20 m in rock of medium hardness or higher. According to different power, it can be divided into pneumatic, internal combustion, hydraulic and electric rock drills, among which pneumatic rock drills are the most widely used.
　　
　　According to the working mechanism of crushing ore, open-pit drilling rigs are divided into wire rope impact drilling, DTH drilling, cone drilling and rotary drilling. Wire rope impact drills are gradually being replaced by other drill bits due to low efficiency. DTH drilling rigs use drill pipes to drive pneumatic impactors and rotate them with drill bits. Pneumatic impactor piston impact drill bits are used to crush ore. Roller drilling rigs are typically used to drill 80-250 mm diameter blast holes in small and medium-sized mines, grinding ore using rolling pins. Suitable for drilling holes with a diameter of 150 to 440 mm in hard rock. It has the advantages of high efficiency and low labor intensity. Acquisition of large and medium-sized open-pit mines. Widely used. A downhole (or conical) drill bit consists of an impactor (or drill bit), a rotating mechanism, a lifting mechanism, a booster, a traveling mechanism, a slag discharge system, a drill frame and a drill pipe. Rotary drilling rigs are only available for soft rock and coal drills.
　　
　　In addition to rock drills, downhole drilling rigs can be applied to small diameter drilling holes of 80-150 mm when drilling holes with a diameter of less than 150 mm. When drilling blast holes with a diameter of 70 mm or less in coal or soft rock, an electric drill or wind drill is usually used, and the drill pipe is passed by electric motor (or air motor) and drill rock (coal) drilling waste. The spiral groove is discharged.
　　
　　Domestic DTH drilling rigs were first produced in Hebei Province in the 50s of the 20th century. With the continuous investment and development of the country, the performance and technical content of drilling platforms have been greatly improved, and the international market has been welcomed. Since the 80s of the 20th century, Fortune 500 companies from countries such as the United States and Sweden have poured in. DTH drilling truck choose our Hunan Ruisheng mechanical and electrical equipment point company, our official website is www.hnzega.com。