Grinder Coupling Mechanism for Vibration Control and Dust Management
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Solution Overview
Problem
Existing hand grinder systems face inefficiencies in tool replacement, vibration, dust accumulation, and power transmission due to complex coupling mechanisms and material limitations, leading to reduced work efficiency and increased maintenance costs.
Innovation Solution
A polishing holder removing device with a double fixing mechanism using bearings and surface contact, combined with a sealing system to prevent dust ingress and egress, and a centrifugal dust discharge mechanism, allowing for easy tool coupling/decoupling and enhanced stability during high-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nut and spanner mechanism is used to couple the grinding tool, then the coupling can be secure, but the tool replacement process becomes complex and time-consuming
Solution Approach 1:
The coupling mechanism is segmented into a coupler with a groove and a separate locking ball that can move independently. The locking ball engages with the groove to secure the grinding tool, while the coupler remains attached to the rotary shaft. This segmentation allows for simple one-handed operation while maintaining secure coupling.
Solution Approach 2:
The locking ball is designed to be movable by the operator's thumb or finger, allowing self-service coupling and decoupling without requiring a separate tool like a spanner. The spring-loaded mechanism provides automatic engagement and disengagement when the grinding tool is inserted or removed.
2Weight of moving object
If the grinding tool is made of resin material, then it can be lightweight, but it generates large vibration during high-speed rotation
Solution Approach 1:
The grinding tool uses a composite structure combining resin material for the main body (providing light weight) with metal components such as the locking ball, spring, and coupling elements (providing rigidity and vibration resistance). This composite approach maintains the weight advantage of resin while compensating for its vibration susceptibility through metal reinforcement at critical locations.
3Device complexity
If three projections are used to support the grinding tool on the coupler, then the structure can be simple, but power transmission is insufficient and coupling force decreases
Solution Approach 1:
The support function and power transmission function are merged into a single groove structure on the coupler. The groove not only supports the grinding tool but also engages with the locking ball to transmit rotational force efficiently. This eliminates the need for separate projections while enhancing both support and power transmission capabilities.
4Duration of action of stationary object
If dust is accumulated in the grooves of bearings during grinding, then the grinder continues to operate, but malfunction occurs due to hardened dust
Solution Approach 1:
The dust accumulation problem is addressed by extracting the dust from the bearing grooves through a cleaning mechanism. A brush or air blow device is introduced to remove dust particles from the bearing areas during or between operations, preventing dust hardening and maintaining reliable operation over extended periods.
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
Significantly improves work efficiency by simplifying tool replacement, minimizing vibration, ensuring stable power transmission, and effectively managing dust, thereby enhancing the overall performance and competitiveness of hand grinders.
Implementation Method 1
a spring (150) that elastically acts on the sleeve (130)
Implementation Method 2
dust generated in grinding is discharged outside through dust discharge holes (125) formed in the coupler (120)
Data Source
Figure 1
Figure 2a~3
Figure 4a~5a
AI summary
The present invention relates to a polishing holder removing device for a grinder that allows a grinding tool to be simply coupled/decoupled to/from a coupler, which is mounted on a rotary shaft of a body of a hand grinder and is rotated at a high speed, and that can ensure anti-vibration, stability, continuity, and smooth transmission of power in grinding by more firmly coupling the grinding tool to the coupler. The present invention includes a grinding tool, a coupler, a sleeve, locking balls, a spring, and a cap nut, in which a cylindrical shank, a groove, and a rectangular shank are sequentially formed at an end portion of a body of the grinding tool; the coupler has a seating hole and a rectangular hole where the grinding tool is fitted and fixed, a threaded-hole for fastening to a grinder body, and a flange having two lines of through-holes formed around the outer side; a lower dustproof groove having a step and a seating groove are formed at a side in the sleeve, and an upper dustproof groove is formed at the other side in the sleeve; the locking balls are disposed in the ball holes formed in the coupler and moved toward/away from the cylindrical shank and the groove of the grinding tool when the sleeve moves so that the grinding tool can be fixed or released; the spring applies elasticity when the sleeve slides; and the cap nut retains the sleeve.