Dust Collecting Element Grounding in Electric Tool Grinding Machines
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Solution Overview
Problem
Conventional electric tool grinding machines accumulate static electricity during dust collection, posing safety risks and requiring expensive or structurally complex solutions.
Innovation Solution
An electric tool grinding machine with a dust collecting element connected to a power ground wire through a charge conducting element, utilizing a static dissipative material and indirect or direct electrical connections to dissipate static charges without altering the machine's structure or using anti-static devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive wire is wound inside the dust suction pipe or conductive material is coated on the surface to guide static electricity to ground, then static electricity dissipation is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the static electricity dissipation function from the dust suction pipe and concentrates it on the dust collecting element. By placing the conductive material only on the dust collecting element rather than throughout the entire suction system, the solution achieves static electricity dissipation while significantly reducing device complexity and cost.
Solution Approach 2:
The patent uses a cost-effective approach by applying conductive material only to the dust collecting element, which is a relatively simple component compared to modifying the entire dust suction pipe system. This reduces material costs and simplifies the overall device structure.
2Reliability
If the dust collecting element is made of metal to avoid static electricity accumulation, then static electricity dissipation is improved, but the manufacturing cost and weight increase
Solution Approach 1:
The patent applies conductive material locally on the inner surface of the dust collecting element rather than making the entire element from metal. This localized approach provides the necessary static electricity dissipation function while maintaining the cost advantages of plastic injection molding and reducing overall manufacturing complexity.
Solution Approach 2:
The dust collecting element combines plastic material with a conductive material layer. This composite structure maintains the ease of manufacture and weight advantages of plastic while adding the static electricity dissipation capability of conductive materials through coating or embedding.
3Reliability
If the dust collecting element is made of metal to avoid static electricity accumulation, then static electricity dissipation is improved, but the weight increases making the tool harder to use long-term
Solution Approach 1:
The conductive material is applied only on the inner surface of the dust collecting element where dust contact occurs, rather than making the entire element from metal. This localized application provides static electricity dissipation while minimizing weight increase, keeping the grinding tool comfortable for long-term use.
Solution Approach 2:
The dust collecting element uses a composite structure combining lightweight plastic with a thin conductive material layer. This approach achieves static electricity dissipation functionality while maintaining the low weight characteristic of plastic materials, ensuring the tool remains ergonomic for extended operation.
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
Effectively dissipates static electricity, enhancing safety by preventing spark discharge and reducing the need for additional anti-static equipment, while maintaining the machine's functionality and cost-effectiveness.
Implementation Method 1
the charge conducting element is electrically connected to the power ground wire... When an electrostatic charge is generated on the dust collecting element, the charge conducting element conducts the electrostatic charge to the power ground wire
Implementation Method 2
utilizing a static dissipative material and indirect or direct electrical connections to dissipate static charges
Data Source
AI summary
An electric tool grinding machine with static electricity dissipation, the electric tool grinding machine includes a machine tool body, a motor disposed in the machine tool body, a power supply unit disposed in the machine tool body and connected to the motor, a grinding disc rotating with the motor, and a dust collecting element facing the grinding disc and assembled with the machine tool body. The power supply unit includes a power ground wire. The machine tool body includes a charge conducting element contacting the dust collecting element, and the charge conducting element is electrically connected to the power ground wire by one of the following: direct connection and indirect connection, when an electrostatic charge is generated on the dust collecting element, the charge conducting element conducts the electrostatic charge to the power ground wire.