What is the structure of the down-the-hole drilling rig?
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Down-the-hole drilling rig, you may have heard that there is not a lot of this equipment, it is a drilling machine, often used in urban construction, railways, highways, rivers, hydropower and other projects to drill rock anchor holes, bolt holes, blasting holes , Drilling and drilling of grouting holes, etc.
The structure of a large open-air DTH drilling rig
1. Drill frame: The drill frame is a guide rail for the sliding of the rotary device, and the advancement and lifting of the drilling tool.
2. Sliding frame: The sliding frame is a square box structure welded by steel plates to connect and support the drill frame.
3. Slewing device: The mechanism consists of a hydraulic motor, a main shaft mechanism, a head press, a sliding plate and a central air supply mechanism. The chain of the propulsion mechanism is fixed on the sliding plate through a pin shaft and a spring damping mechanism.
4. Propulsion mechanism: The propulsion mechanism is composed of a propulsion hydraulic motor, a sprocket set, a chain and a buffer spring.
5. Rod unloader: The rod unloader consists of an upper rod unloader body, a lower rod unloader body, a clamp rod cylinder, and a rod unloader cylinder.
6. Dust removal device: The dust removal device is divided into dry dust removal, wet dust removal, hybrid dust removal and foam dust removal.
7. Walking mechanism: The walking device is composed of a walking frame, a hydraulic motor, a multi-stage planetary reducer, a crawler, a driving wheel, a driven wheel and a tensioning device.
8. Frame: The air compressor, dust removal device, fuel tank pump group, valve group, driver's cab, etc. are all installed on the frame.
9. Body rotation mechanism: This mechanism is composed of a rotation motor, brake, deceleration device, pinion, slewing support, etc.
10. Drill frame deflection mechanism: This mechanism is composed of a deflection cylinder, hinge shaft and hinge seat, etc., which can make the drill frame deflection left and right to adjust the drilling angle.
11. Compressor system and impactor: The compressor system is generally equipped with a screw air compressor, which provides compressed air to the blowing and ash cleaning system of the high-pressure impactor and the laminar flow dust collector.
The drilling tool is composed of a bit drill rod, a button drill bit and an impactor. When drilling, use two drill bit drill rod extension rods, stainless steel plate. The rotary air supply mechanism is composed of a rotary motor, a rotary reducer, and an air supply gyrator. The slewing reducer is a closed heterosexual component with a three-stage cylindrical gear, and it is automatically lubricated with a spiral oiler. The air supply gyrator is composed of a connecting body, a seal, a hollow main shaft and a drill pipe joint, etc., on which there is a pneumatic clamp for connecting and unloading drill pipes. The lifting pressure regulating mechanism is realized by the lifting motor with the help of the lifting reducer and the lifting chain, so that the rotating mechanism and the drilling tool can realize the lifting action. In the closed chain system, there is a pressure regulating cylinder, a movable pulley block, and a waterproofing agent. During normal operation, the piston rod of the pressure regulating cylinder pushes the movable pulley block to realize the decompression drilling of the drilling tool.
