Core Drill Screw Release Using Reverse Torque Spikes
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Solution Overview
Problem
Conventional screw connections between core drilling devices and drill bits are difficult to release due to applied forces, especially when corrosion occurs, and existing methods such as using wrenches, quick release rings, or lubricants are cumbersome, costly, and can contaminate the site.
Innovation Solution
A method involving a core drilling device with a drive shaft that applies torque spikes and reverses direction of rotation to easily release the screw connection between the core drilling device and drill bit without additional tools or lubricants, utilizing brief, high-torque impulses to separate the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wrenches with long levers and additional pipes or bars are used to generate separating forces, then the screw connection can be released, but the device complexity increases and additional aids must be carried along
Solution Approach 1:
The core drilling device automatically releases the drill bit by reversing its own drive shaft rotation and applying torque spikes to itself, eliminating the need for external wrenches or releasing aids. The system uses its own motor and drive mechanism to generate the separating force.
Solution Approach 2:
Instead of applying external force to unscrew the connection, the system reverses the normal drilling rotation direction and applies torque spikes in the opposite direction, using the inverted rotation to automatically release the screw connection between the drive shaft and drill bit.
2Ease of operation
If flats are provided on the core drilling device and drill bit for applying aids, then the screw connection can be released, but the core drilling device and drill bit become larger and longer
Solution Approach 1:
The releasing mechanism is integrated into the existing drive shaft and motor assembly, using the device's own structural components to generate releasing forces without requiring additional flats or external attachment points.
Solution Approach 2:
The drive shaft serves dual functions: it transmits torque during normal drilling operation and simultaneously acts as the releasing mechanism when rotation is reversed and torque spikes are applied, eliminating the need for separate releasing structures.
3Ease of operation
If a generous amount of lubricant is used to make releasing easier, then the screw connection can be released, but material consumption increases and contamination occurs
Solution Approach 1:
The patent replaces the chemical method (lubricant) with a mechanical method (torque spikes through reversed rotation), using dynamic mechanical forces to break the corrosion-bonded connection without consuming any material.
Solution Approach 2:
The system changes the torque parameter dynamically by applying brief high-magnitude torque spikes during reversed rotation, transforming the static friction problem into a dynamic mechanical separation problem that requires no lubricant.
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
Enables easy and tool-free release of the drill bit from the core drilling device, reducing material and production costs, and preventing site contamination, while maintaining system stiffness.
Implementation Method 1
torque spikes to be applied to the drive shaft (3) of the core drilling device (1), wherein, as a result of the torque spikes and the changed direction of rotation of the drive shaft (3), the drill bit (2) can be separated from the core drilling device (1)
Implementation Method 2
it is possible for such a screw connection to be released only with great difficulty under certain circumstances. This can be the case in particular when corrosion additionally occurs
Data Source
AI summary
A method for releasing a screw connection between a core drilling device and a drill bit, wherein the screw connection is released by application of torque spikes to the drive shaft of the core drilling device, these torque spikes coming into effect when the drive shaft is driven counter to the actual drilling direction of the core drilling device. A core drilling device with which the proposed method can be carried out is also provided. To this end, the core drilling device includes a drive shaft to which torque spikes can be applied, wherein the drive shaft can be driven in a drilling direction and a second direction of rotation which is opposite to the drilling direction. A core drilling device, in which the reversal of a direction of rotation of a drive shaft of the core drilling device and application of torque spikes to the drive shaft are combined with one another such that, as a result of the combination of the reversal of the direction of rotation and torque spikes, a screw connection between the core drilling device and a drill bit can be released.