Research on digital electric drive upgrading of XY-8 spindle drill rig

Abstract:

To address the problems of traditional spindle core drilling rigs， such as high labor intensity， high safety risks， borehole instability caused by frequent rod pulling， and the inability to acquire drilling parameters in real time， this paper proposes a low-cost， high-performance digital upgrading and retrofitting scheme taking the XY-8 drilling rig as the research object. Following the principle of "main structure retention， function enhancement， and digital transformation"， the scheme adopts AC variable frequency motors to achieve stepless speed regulation for the rotary and hoisting systems， and reconstructs the braking system to a hydraulic disc brake system. A multi-mode cooperative feeding system is constructed， comprising small-motor automatic feeding， servo pump-controlled feeding， and non-powered disc brake feeding， which effectively solves the problem of limited stroke in conventional hydraulic cylinder feeding. Furthermore， a PLC-based electromechanical-hydraulic integrated control platform is developed to realize logical interlocking and closed-loop parameter control for all actuators. Prototype tests indicate that the speed control error of the retrofitted rig does not exceed ±1.5%， the weight on bit （WOB） control error is within ±5%， and the braking response time is shortened to 0.3 s. The energy consumption per unit footage and standby energy consumption are reduced by approximately 29% and 75%， respectively， while the retrofitting cost is about 25% lower than that of purchasing new equipment with equivalent performance. This study provides a replicable engineering path for the digital transformation of the massive stock of existing spindle drilling rigs， offering solid technical support for deep mineral exploration and the digitalization of geological equipment.