Analysis of the Electrical Control System of Rotary Drilling Rigs: Fault Diagnosis, Safety Protection and Operation Logic

    The electrical control system of the rotary drilling rig is the core center of the entire machine, responsible for power distribution, action coordination, status monitoring, and safety protection, directly determining the construction accuracy, stability, and reliability of the equipment. The system uses PLC as the control core, combined with sensors, display screens, actuators, and operating handles, to achieve full process automation control of drilling mast verticality, main and auxiliary winches, pressurized feed, and rotary positioning.

    Fault diagnosis adopts a layered monitoring mode, which collects key data such as engine, hydraulic system, and electrical circuit in real time through the on-board display screen, and provides coded prompts for issues such as abnormal current, sensor failure, communication failure, and overload exceeding limits. The system has fault self diagnosis and historical recording functions, which can quickly locate common electrical faults such as short circuits, poor contacts, and signal loss, assisting maintenance personnel in shortening troubleshooting time and reducing downtime losses. For components such as limit switches, encoders, solenoid valves, etc. that are prone to malfunctions, the control system will provide advance warnings to avoid small faults causing major problems.

    The safety protection mechanism runs through the entire construction process and has multiple hardware and software protections. Automatic verticality correction function of drilling mast to prevent equipment tilting and instability; Both the main and auxiliary winches, as well as the pressurization mechanism, are equipped with overload protection and upper and lower limit positions to prevent accidents caused by overtravel and over hoisting. When there is a high oil temperature, abnormal voltage, or emergency stop signal, the system will automatically cut off the dangerous output, prioritizing the safety of personnel and equipment. At the same time, the operation interlock logic can avoid action conflicts. Only when the safe startup conditions are met can the device enter the working state, reducing the risk of misoperation from the source.

    The operation logic follows the principles of simplicity, efficiency, and human-machine collaboration, combining manual intervention with automatic assistance. The operator issues commands through the handle and display screen, and the PLC processes the signals in real time to drive the hydraulic actuator, achieving precise control of drilling, lifting, rotation and other actions. The system supports manual/automatic switching, and automatic mode can be enabled in pile foundation positioning, verticality adjustment, hole depth control and other aspects to improve construction accuracy and consistency. Under different working conditions, the system will intelligently match power output, balancing construction efficiency and energy consumption control.

    Overall, a stable and reliable electrical control system is the key to efficient operation of rotary drilling rigs. Complete fault diagnosis, rigorous safety protection, and clear operating logic can not only reduce operational difficulty but also improve equipment attendance and service life.