Rotary Drilling Rig Main Hoist Control for Consistent Soil Shaking
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Solution Overview
Problem
The existing main winch systems for rotary drilling rigs face inefficiencies in shaking off cohesive soil due to uncontrolled shaking frequency and amplitude, relying heavily on manual operation, which results in unsatisfactory soil-shaking effects and delayed response times.
Innovation Solution
A main winch system incorporating a main action loop, pilot control loop, and feedback control loop with two-position three-way solenoid valves, allowing for automated control of the solenoid valves to maintain consistent hydraulic pump displacement and feedback pressure, enabling responsive and controlled shaking of the main winch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual operation of the main control valve is used to shake off cohesive soil, then the drilling rig can remove soil from the drilling tool, but the shaking frequency and amplitude cannot be controlled consistently, resulting in unsatisfactory soil-shaking effect
Solution Approach 1:
The patent replaces the manual mechanical operation of the main control valve with an automated electronic control system. The automated control system uses electronic signals to actuate the main control valve, eliminating manual intervention and ensuring consistent shaking frequency and amplitude. This substitution of mechanical manual operation with an automated control system resolves the contradiction by maintaining operational consistency while preserving soil-shaking effectiveness.
Solution Approach 2:
The patent implements a feedback control system that monitors the shaking parameters and adjusts the main control valve accordingly. The feedback mechanism ensures that the shaking frequency and amplitude remain consistent by continuously comparing actual parameters with target values and making real-time adjustments. This feedback loop resolves the contradiction by maintaining operation consistency without compromising soil-shaking effectiveness.
2Productivity
If the main control valve is opened and closed repeatedly during manual operation, then the hydraulic pump displacement changes correspondingly, but the action response speed of the main winch is delayed due to response delay and hysteresis
Solution Approach 1:
The patent replaces manual mechanical operation with an automated electronic control system that directly actuates the main control valve. This electronic control system eliminates the response delay and hysteresis associated with manual operation by using electronic signals that can be precisely timed and controlled. The automated system opens and closes the main control valve at exact intervals, improving action response speed while maintaining soil-shaking effectiveness.
Solution Approach 2:
The patent implements periodic action through automated control of the main control valve, which opens and closes at precise, consistent intervals. This periodic operation eliminates the irregular timing and response delays of manual operation, ensuring that the hydraulic pump displacement changes occur at the optimal frequency for soil shaking. The consistent periodic action improves both response speed and soil-shaking effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system automatically shakes the main winch up and down, effectively removing cohesive soil without manual operation, reducing operator reliance and enhancing construction efficiency.
Implementation Method 1
The pilot control loop includes a pilot handle, a solenoid valve I, a pressure relay, and the main control valve in the main action loop
Implementation Method 2
The main action loop includes an engine, a hydraulic pump, a main control valve, a balance valve, a main winch motor, and an oil tank
Data Source
AI summary
A main winch system of a rotary drilling rig includes a main action loop, a pilot control loop, and a feedback control loop. The main action loop includes an engine, a hydraulic pump, a main control valve, a balance valve, a main winch motor, and an oil tank. The pilot control loop includes a pilot handle, a solenoid valve I, a pressure relay, and the main control valve in the main action loop. The feedback control loop includes a solenoid valve II and the hydraulic pump and the main control valve in the main action loop. In response to a lifting action of the pilot handle for the main winch, under the control of a button, the solenoid valve II is energized continuously, and the solenoid valve I is energized and de-energized according to a given rule.