The Rotary drilling cylinder is the core hydraulic component of the rotary drilling rig, responsible for controlling the angle of the drilling mast, adjusting the position of the drilling tool, and achieving key functions of power transmission. As the 'muscle system' of the rotary drilling rig, the performance of the oil cylinder directly determines the overall work efficiency, positioning accuracy, and load capacity of the machine. In modern infrastructure construction, from the foundation of highways and high-speed railways to the construction of high-rise building foundations, rotary drilling oil cylinders play an irreplaceable role.

Rotary drilling oil cylinder is a hydraulic driving device, usually composed of the oil cylinder body, piston, piston rod, and oil cylinder head. According to different functions, rotary drilling rig oil cylinders are mainly divided into types such as variable amplitude oil cylinders, pressure oil cylinders, and mast oil cylinders. The variable amplitude oil cylinder is used to control the vertical movement of the drilling mast or derrick and accurately position the drilling equipment; The pressure cylinder provides the necessary pressure and lifting force for drilling; The mast oil cylinder is responsible for adjusting the angle and position of the mast.

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The rotary drilling oil cylinder is a typical double acting hydraulic cylinder that can generate force in two directions. It consists of a cylindrical body, a piston, and a piston rod, filled with hydraulic oil inside, which generates the force required to lift and lower the drill rod after pressurization. Specifically, the operation of the rotary drilling oil cylinder relies on the hydraulic system to provide power. When high-pressure hydraulic oil enters one side of the cylinder, it pushes the piston to move, thereby outputting thrust or tension through the piston rod.

The variable amplitude oil cylinder raises or lowers the mast by extending or retracting the piston rod, achieving precise positioning of drilling equipment. This adjustment is crucial for adapting to various drilling depths and angles encountered during drilling operations. The pressurized oil cylinder is responsible for providing continuous downforce and pullback force during the drilling process, ensuring that the drill bit can effectively break the formation and smoothly exit. The pressurized oil cylinder is usually composed of a working oil cylinder and a return oil cylinder. The working oil cylinder generates thrust to push the drilling rig truss to expand and contract, while the return oil cylinder controls the recovery movement of the drilling rig truss to prepare for the next drilling.

The rotary drilling oil cylinder is usually connected to the drilling mast and the base structure of the drilling rig through sturdy installation points, working in conjunction with other hydraulic components and control systems to provide coordinated and controlled movement of the drilling mast. In rotary drilling rigs, oil cylinders are designed to withstand high loads and harsh operating conditions, making them sturdy, durable, and capable of withstanding heavy loads and extreme forces. They are usually made of high-strength materials and undergo strict quality control measures to ensure reliability and safety during drilling operations.

The rotary drilling oil cylinder has a series of significant technical characteristics that enable it to meet the requirements of complex working conditions:

High output torque: It can meet the high torque requirements of the rotary drilling rig during drilling, ensuring sufficient drilling capacity.

Smooth movement: Due to the use of hydraulic oil as the medium, the movement of the piston is very smooth, without vibration or noise, ensuring drilling accuracy.

High reliability: Using high-quality materials and advanced manufacturing processes, the rotary drilling oil cylinder has a long service life and high reliability.

Easy maintenance: If the rotary Excavator cylinder malfunctions, it can be easily repaired and replaced, reducing downtime.

The main technical parameters of the rotary drilling oil cylinder include aperture, rod diameter, stroke, and working pressure. According to the data provided by HZPT, the typical specifications of the rotary drilling variable amplitude oil cylinder are: aperture of 125mm to 250mm; Rod diameter ranging from 90mm to 160mm; The travel distance shall not exceed 1640 millimeters; The working pressure is as high as 32MPa. These parameters vary depending on different drilling rig models and application requirements. For example, the maximum pressure of the pressure cylinder of the XZ12 rotary drilling rig is 100kN, the maximum lifting force is 120kN, and the maximum stroke of the pressure cylinder can reach 3000mm.