What are the main equipment for perforation work?

Perforation work is the first step in the mining of solid deposits, the purpose of which is to provide holes for the explosives to be supplied for subsequent blasting work. The quality of the perforation has a great influence on the subsequent blasting, loading and other work. Open-pit mine perforating equipment includes roller boring machine , down-hole drilling rig , fire drill, rock drilling rig, steel rope impact rig, etc. The most commonly used perforating equipment for large and medium-sized open pit mines is roller rig and down-the-hole drilling rig.

1 ) Roller rig

The roller rig is a new type of perforating equipment that emerged in the mid-1950s. With the increasing perfection of the roller rig and the drill bit, it has become the most widely used perforating equipment for open pit mines, especially large and medium-sized open pit mines. Canada, USA Such high-efficiency perforating equipment is used almost exclusively in large open pit mines in mining technology developed countries.

The roller rig is a high-efficiency perforating device. According to the perforation footage, the perforation speed is generally 4,000~6,000m·mon -1 , up to 10,000m·mon -1 ; if it is calculated according to the annual wear volume, it is generally 400. ~6 million tons, up to 1,200 ~ 14 million tons, such efficiency is 4 to 5 times that of steel rope impact drills.

In the current range of blasthole diameters, the larger the diameter, the greater the charge. The size of the mesh is increased, the amount of blasting per metre of the blasthole is increased, the consumption of the drill bit is reduced, and the cost of drilling is significantly reduced. In the past 20 years, some large mines have increased the diameter of the blasthole from 250mm to 310mm, 380mm and 445mm. The maximum diameter of the recently drilled P&H120A roller rig can reach 559mm. This trend also reflects the large aperture. Better economic indicators.

2 ) DTH drilling rig

The down-the-hole drilling rig was also a new type of perforating equipment that emerged in the 1950s. In the 1960s, it took the lead in replacing the bulky steel rope into the drilling rig. Later, due to the development of the roller rig, he retired to the second place. In general, down-the-hole drilling rigs are not as good as roller rigs, but the former also have some unique advantages, such as:

(1) The small diameter (150~200mm diameter) can drill the inclined hole, and the blasting ore rock is small, which is convenient for the use of small excavators.

(2) The equipment is simple and easy to manufacture;

(3) The equipment is relatively stable, the perforation efficiency is high, the monthly monthly footage is about 2000m, and the amount of rock in the Taiwanese exploding period is about 600~1.5 million tons.

The above advantages make the down-the-hole drilling rig particularly suitable for small and medium-sized open-pit mines, and are widely used in China.

DTH drilling rig is a rotary impact drill, consisting of drilling tool set, slewing mechanism, propulsion lifting mechanism, pressure and dust removal system, electrical system, drilling frame and landing gear, drilling tool storage and removal mechanism, walking mechanism, driver The room and the operation control system are composed of parts. When drilling, the pneumatic impactor sneaked into the bottom of the hole, destroying the rock at the bottom of the hole, and completing the drilling process.

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