1. Power Head
The power head is a crucial component of the drilling rig, responsible for outputting torque. It consists of a variable displacement hydraulic motor, a planetary reducer, a power box, and several auxiliary components. Its working principle is as follows: high-pressure oil supplied by a hydraulic pump drives the hydraulic motor to output torque. The planetary reducer and power box then reduce and increase the torque. Power heads can be hydraulically driven, electrically driven, or engine-driven, but all types offer low-speed drilling and high-speed reverse soil-throwing capabilities. Currently, most use hydraulic drives, employing dual-variable displacement hydraulic motors, dual-speed reducer drives, or low-speed, high-torque hydraulic motor drives. Power heads typically offer multiple drilling speeds, suitable for various working conditions.screw pile driver for sale
2. Main Winch
The main winch is another important component of the drilling rig, responsible for lifting or lowering the drill rod. It consists of a hydraulic motor, a planetary reducer, a brake, a drum, and a wire rope. Its working principle is as follows: high-pressure oil from a hydraulic pump drives the main winch motor. Simultaneously, the oil circuit and mechanical brake are activated. The reducer reduces and increases the torque, driving the drum to rotate and lift or lower the main winch. The main winch is closely related to drilling efficiency, the probability of drilling accidents, and the lifespan of the wire rope. Italian IMT rotary drilling rigs have drill rod ground contact protection to prevent wire rope damage from tangling. Especially noteworthy are the rotary drilling rigs from the Italian company MITEK, which feature a large-capacity main winch drum, single-layer wire rope winding, constant lifting force, and no overlapping or crushing of the wire ropes, thus reducing wear and extending their service life. Foreign rotary drilling rigs generally use non-rotating wire ropes with better flexibility in their main winches to further improve service life.hydraulic drilling rig for sale
3. Pressurization Device
The function of the pressurization device is to apply pressure to the power head. The pressure is transmitted from the pressurization device to the power head, drill rod, drill bit, and drill teeth, achieving the purpose of cutting, crushing, or grinding. There are two types of pressurization: hydraulic cylinder pressurization and winch pressurization. Hydraulic cylinder pressurization: The pressurizing cylinder is fixed to the mast, and its piston is connected to the power head slide. The working principle is that a high-pressure oil supplied by the drilling rig's auxiliary hydraulic pump enters the rodless chamber of the cylinder, pushing the piston to apply pressure to the power head. When stopping, a one-way balance valve locks the oil to prevent the power head from sliding down. Advantages: Simple structure, easy maintenance.
Winch pressurization: A winch assembly is installed on the mast. Two steel wire ropes are wound opposite each other on the drum, one for pressurization and one for lifting. These are connected to the power head's movable pulley via a fixed pulley on the mast, and then fixed to the lower and upper masts respectively, achieving lifting or pressurization. Advantages: Greater pressure can be achieved through the movable pulley, allowing for long spiral drilling. Disadvantages: The structure is somewhat complex, assembly and disassembly are troublesome, and operational precautions are increased. Both hydraulic cylinder and winch pressurization achieve pressurization, only the pressurization method differs.
4. Drill Rods and Drill Tools Drill rods are a key component, categorized into internal friction type external pressure telescopic drill rods and automatic internal locking type external pressure telescopic drill rods. Internal friction type drill rods offer high drilling efficiency in soft soil layers, while locking type drill rods increase the downward pressure applied by the power head to the drill rod and transmitted to the drill tool, making them suitable for drilling hard rock layers, but requiring more precise operation. To improve operational efficiency, most drilling rigs are equipped with two sets of drill rods. Drill tools are diverse, currently including long auger and large-diameter short auger drill bits, rotary drill buckets, sand scoop buckets, cylindrical drill buckets, underreaming drill bits, and core drill bits.
5. Chassis Rotary drilling rig chassis can be categorized into dedicated chassis, crawler hydraulic excavator chassis, crawler crane chassis, walking chassis, and truck chassis. However, crawler dedicated chassis offer compact structure, convenient transportation, and an attractive appearance, but are more expensive. Currently, the vast majority of rotary drilling rigs produced domestically and internationally utilize dedicated chassis.borehole drilling equipment for sale
