Magnetic Moil Guide for Liner Bolt Removal
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Solution Overview
Problem
The removal of liner bolts from mill casings is challenging due to corrosion and compacted clearances, requiring manual hammering, which is dangerous and time-consuming, and existing tools are cumbersome and require assistance for alignment, posing risks to workers.
Innovation Solution
A moil guide with a magnetic attachment device, comprising a mechanically or electronically activated magnet, allows secure attachment to metal surfaces, enabling precise alignment and operation of a hammer moil for efficient bolt removal without manual assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic or pneumatic liner bolt removal tools are used, then repetitive impacts can be delivered for bolt removal, but the tools are difficult to handle and align due to their size and weight
Solution Approach 1:
The invention divides the bolt removal system into two separate components: a handheld guide device that provides alignment and a separate hammer tool that delivers impacts. The guide device includes a guide aperture and positioning features that can be manually positioned on the bolt, while the hammer tool is used by the operator to strike the bolt through the guide. This segmentation allows each component to be optimized independently - the guide for precision and the hammer for impact delivery.
Solution Approach 2:
The guide device acts as an intermediary between the operator and the bolt. It provides a stable reference frame with guide apertures that define the precise strike location, allowing the operator to align the hammer without directly manipulating the hammer near the bolt head. This intermediary structure eliminates the need for the operator to manually position and hold alignment tools near the work area.
2Measurement precision
If a workman manually aligns the moil with the liner bolt using a hand-held moil guide, then alignment is achieved, but the workman is placed at risk of injury due to proximity to the working end
Solution Approach 1:
The guide device serves as a safe intermediary that remains stationary on the bolt while the operator performs the hazardous striking action from a safer position. The guide apertures and positioning features establish precise alignment without requiring the operator's hands or body to be in the danger zone near the bolt head during impact.
Solution Approach 2:
The alignment function is extracted from the hammer tool and placed into a separate guide device that remains on the bolt. This allows the operator to use the guide for alignment while maintaining distance from the impact zone, separating the alignment task from the hazardous striking task.
3Strength
If large sledge-hammers are used for manual bolt removal, then bolt freeing is achieved, but the process is difficult and time-consuming
Solution Approach 1:
The invention replaces the traditional manual sledgehammer technique with a more efficient system combining a guided percussive tool and a specialized moil. The guide device ensures precise alignment on the first attempt, eliminating repeated misaligned strikes that waste time. The moil geometry is optimized for effective bolt engagement and removal.
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 moil guide reduces worker risk by eliminating the need for manual alignment and assistance, speeds up the bolt removal process, and prevents washer loss during removal.
Implementation Method 1
a magnetic attachment device attached to the sleeve, the magnetic attachment device being operable to selectively generate a magnetic field to removably attach the moil guide to a metal surface
Data Source
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AI summary
A moil guide having a sleeve that has an opening adapted to receive at least a portion of a linerbolt. The moil guide also has a magnetic attachment device attached to the sleeve. The magnetic attachment device is operable to selectively generate a magnetic field. The magnetic attachment device is operable to selectively generate the magnetic field to removably attach the moil guide to a metal surface.