Hydraulic Brake Lock for Drill String Rotation Control
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Solution Overview
Problem
Horizontal directional drills face challenges in efficiently making up and breaking out pipe segments from the drill string, particularly in controlling the rotation and disconnection processes, which can lead to wear and inefficiency.
Innovation Solution
A rotation brake system comprising a motor, pinion, spindle, and brake assembly, where the brake lock is movable between engaged and disengaged positions to stop or allow rotation of the spindle assembly, utilizing a hydraulic actuator and splines for precise control, allowing for controlled rotation and disconnection of pipe segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a brake assembly is added to control spindle rotation, then rotational control precision is improved, but device complexity increases
Solution Approach 1:
The brake lock acts as an intermediary component between the hydraulic actuator and the pinion. It translates hydraulic linear motion into rotational locking/unlocking action, providing precise rotational control without requiring direct hydraulic connection to the spinning pinion. This mediator approach resolves the contradiction by enabling precise control while maintaining relatively simple system architecture.
Solution Approach 2:
The braking function is extracted as a separate, dedicated brake assembly rather than being integrated into the main drive mechanism. The brake lock, actuator, and housing form an independent modular unit that can be added to existing drill strings, providing rotational control precision without fundamentally redesigning the entire drive system, thus limiting the increase in overall device complexity.
2Force
If the brake lock engages the pinion to stop rotation, then rotational stopping capability is improved, but wear on components increases
Solution Approach 1:
The hydraulic actuator provides controlled, gradual engagement and disengagement of the brake lock with the pinion. Instead of sudden mechanical impact, hydraulic fluid pressure enables smooth transition, reducing shock loads and wear on both the brake lock and pinion teeth. The hydraulic system's inherent damping characteristics further minimize impact wear during engagement events.
Solution Approach 2:
The brake assembly design incorporates features that cushion the engagement between brake lock and pinion. The hydraulic actuator system provides gradual pressure application, and the brake lock geometry is designed to engage smoothly with the pinion teeth, preventing sudden impacts that would cause wear. This beforehand cushioning approach protects components from harmful wear while maintaining effective stopping capability.
3Ease of operation
If the brake assembly uses hydraulic actuator for precise control, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The hydraulic actuator system is integrated with the existing drill string hydraulic infrastructure. The brake assembly utilizes the already-present hydraulic fluid supply and control mechanisms in the drill string, eliminating the need for separate hydraulic pumps, reservoirs, or control systems. This self-service approach leverages existing system resources, providing ease of operation without proportionally increasing overall device complexity.
Solution Approach 2:
The brake assembly is designed to utilize the universal hydraulic control system already present in horizontal directional drilling equipment. The same hydraulic infrastructure that controls other drill string functions also actuates the brake, making the brake system easy to operate through existing controls while avoiding duplication of hydraulic components and reducing overall system complexity.
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 effectively manages the rotation and disconnection of pipe segments, reducing wear and improving operational efficiency by ensuring precise control over the spindle assembly's rotation, thus extending the lifespan of components and enhancing drilling operations.
Implementation Method 1
The rotation brake may be hydraulically actuated
Implementation Method 2
The brake lock and pinion are not in contact when the brake lock is in the first position and are rotationally locked when the brake lock is in the second position
Data Source
AI summary
A rotation brake for stopping rotation of a spindle assembly on a horizontal directional drill. The rotation brake comprises a brake lock that is actuated by a cylinder and spring to interact with a non-rotating brake cap and a rotating pinion, thereby stopping rotation of the pinion. The brake lock is removed from the pinion by applying pressurized fluid to a cylinder such that a cylinder rod moves the brake lock out of a cavity between the brake cap and the pinion. Upon removing fluid pressure from the cylinder, a compressed spring moves the brake lock back to into the cavity, preventing rotation.