| An intelligent disc brake electro-hydraulic system with advanced and suitable technology and devices developed by Sichuan Honghua Petroleum Equipment Co., Ltd, has greatly improved the safety of mechanical rig drilling operations, prolongs service life of drilling equipment and saves driller's labor., When applied to VFD (Variable Frequency Digital-controlled) rig, ideal effects can be achieved.Inherent defects consists in the present electro-controlled disc brake hydraulic system equipped in DBS rigs(VFD rigs) or manually-operated disc brake hydraulic system of the still older generation, including:Open-loop control, fairly low control precision, unsophisticated operations, incapable of data feedback or transmission;Single braking mode, with same braking characteristics at all working conditions, incapable of controlling and adjusting braking performance, not suitable for varying working conditions and working environments; dynamic performance of the system depends on that of components equipped;Slow braking response, often resulting in, in case of emergency, such serious accidents as brake-slipping, the string -dropping, or knocking on the rotary table;The requirements of suspension-braking in the draw works VFD motor independent of the hydraulic system severely affect the braking performance of the entire system; and, complicated system and difficult diagnosis on failures.The new generation of intelligent disc brake system improves targeting the defects above and has the following features:Close-loop control, quick braking response and high control precision;Capable of setting appropriate system response performance models per varying working conditions in emergency braking, parking and service braking;Adjustable response time and control features, and fully visual for control parameters (say control values and feedbacks) and control status(say response behavior curve);Classified travelling block height into safe interval and dangerous interval, integrating with the system braking mode;Incorporated motor's suspension-braking into the system, avoid the impairment of the system braking performance caused by fairly long motor braking time; and,Incorporated system trouble shooting programs, having automatic trouble shooting and diagnosis functions. The disc braking hydraulic system provides hydraulic energy for braking hoisting draw works of a rig. The entire system consists of hydraulic oil pump package, accumulators, control valves, NO (normally open) cylinders, NC(normally-closed) cylinders, pressure sensors, connecting piping etc.. Operations of the hydraulic brakes are achieved by virtue of valve-controlled cylinders. Its dynamic behavior determines to a great extent the performance of the entire system, and is determined by the combination of control valves, cylinders and loads.The disc brake control system adopts close-loop controls, making it possible to adjust the system control dynamic performance for varying applications of a rig and directly set, adjust, control and display the system response status on the monitor. Incorporated with intelligent diagnosis and troubleshooting system, it can greatly improves the safety, reliability, user-friendliness and lessen loss caused by possible accidents. |
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