Electric Grinding Machine Cover Window Hinge Mechanism
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Solution Overview
Problem
Conventional electric grinding machines with dust control functions face inefficiencies when grinding near walls due to cumbersome cover designs that either require screw insertion/removal or suffer from dust accumulation and friction issues, affecting work efficiency and dust collection.
Innovation Solution
An electric grinding machine with a window on the cover that is easily opened and closed via a hinge mechanism, combined with a slider and torsion spring system, allowing for automatic operation and maintaining smooth functionality even after multiple uses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bowl shape cover covers the whole circumference of the grinding disc, then dust collection is improved, but the ability to grind corner edge portions near walls deteriorates
Solution Approach 1:
The cover is divided into a main cover and a separate sub-cover that can be selectively attached or removed. The sub-cover corresponds to a specific angular range (e.g., 90 degrees) and can be detached to expose the grinding disc for corner grinding operations, while the main cover remains to provide dust collection for the rest of the disc.
Solution Approach 2:
The sub-cover is designed to be freely attachable and detachable from the main cover, allowing the cover configuration to dynamically adapt between two states: fully covered for dust collection during regular grinding, and partially exposed for corner grinding operations near walls.
2Adaptability or versatility
If a sub-cover is made freely attachable/detachable to expose the grinding disc, then the ability to grind corner edges is improved, but work efficiency deteriorates due to screw insertion/removal
Solution Approach 1:
The fastening mechanism is extracted from the traditional screw-based system to a simpler snap-fit or clip-based system. The sub-cover includes positioning protrusions that engage with corresponding recesses on the main cover, eliminating the need for screw insertion and removal, thereby significantly improving work efficiency when switching between regular and corner grinding operations.
3Adaptability or versatility
If a hatch is made plug-in type to be attachable/detachable, then the ability to expose the grinding disc is improved, but ease of operation deteriorates due to friction from dust accumulation
Solution Approach 1:
A dust-resistant coating or lubricating layer is introduced as an intermediary between the mating surfaces of the sub-cover and main cover. This intermediary layer prevents dust particles from creating friction barriers, ensuring that the snap-fit or clip-based fastening system remains easy to operate even after prolonged use in dusty environments.
4Ease of operation
If a shroud door is joined with a hinge mechanism to be rotatable, then ease of operation is improved, but reliability deteriorates when external load is applied
Solution Approach 1:
The fastening system transitions from a static hinge-based rotational mechanism to a dynamic snap-fit system that can quickly transition between locked and unlocked states. The positioning protrusions and recesses are designed to engage firmly under normal conditions but can be easily disengaged by applying minimal force in the opposite direction, allowing the sub-cover to be quickly removed or attached without the complexity of hinge mechanisms.
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 efficient dust collection and improved work efficiency by allowing easy exposure of the grinding disc for corner edges without reducing suction power or increasing friction, ensuring effective dust management during both regular and wall-grinding operations.
Implementation Method 1
a torsion spring 47 disposed around the rotational axes of the hinge mechanism 7. The torsion spring 47 is configured to urge the window 6 in a direction to be opened all the time.
Implementation Method 2
The slider 39 is urged by a piston spring 45 to always protrude toward the window 6
Implementation Method 3
a hinge mechanism 7 to join the window 6 to the cover 8 so that the window 6 is freely opened and closed. The hinge mechanism 7 is configured so that a rotational axis thereof is disposed on the cover 8.
Data Source
AI summary
An electric grinding machine includes a spindle to be driven with a motor; a grinding disc attached to the spindle; a cover covering the grinding disc; a window disposed on the cover to expose an outer circumference of the grinding disc; a hinge mechanism joining the window to the cover so that the window freely moves between an opened position and a closed position, said hinge mechanism having a rotational axis disposed on the cover; a gate protruding from the window and having a cylindrical portion concentrical to the rotational axes; a hollowed portion formed in the gate, said hollowed portion forming a passage opening between the cover and the cylindrical portion when the window is closed; a slider disposed on the cover, said slider passes through the passage opening to hold the window in the closed position; and a piston spring urging the slider toward the window.