Grounded Dust Collection 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 anti-static solutions or complex metal configurations that increase costs and tool weight.
Innovation Solution
An electric tool grinding machine with a dust collecting element connected to a power ground wire through a charge conducting element, allowing electrostatic charges to be dissipated without the need for anti-static devices or metal components, using a static dissipative material that is less than 30% of the dust collecting element's composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-static dust suction pipe with conductive wire or coating is used, then static electricity can be dissipated, but the cost increases and compatibility issues arise among different brands
Solution Approach 1:
The invention extracts the grounding function from the dust suction device and relocates it to the power supply unit. The power ground wire is directly connected to the machine tool body, separating the static electricity dissipation function from the dust collection system. This eliminates the need for anti-static dust suction pipes and conductive wires while maintaining effective grounding.
Solution Approach 2:
The power ground wire in the power supply unit serves multiple functions: it provides grounding for electronic components and simultaneously dissipates static electricity generated during dust collection. This multi-functional approach eliminates the need for separate anti-static components, reducing device complexity while maintaining reliability.
2Reliability
If dust collecting element is made of metal to avoid static electricity accumulation, then electrostatic conductivity is improved, but processing costs increase and tool weight increases
Solution Approach 1:
The invention replaces the mechanical approach of using metal materials with an electrical approach. Instead of changing the material composition of the dust collecting element, the patent uses the power ground wire to provide an electrical pathway for static electricity dissipation. This allows the dust collecting element to remain lightweight while maintaining electrostatic conductivity through the grounding system.
3Reliability
If dust collecting element is made of metal to avoid static electricity accumulation, then electrostatic conductivity is improved, but processing costs increase
Solution Approach 1:
The invention replaces the manufacturing-intensive metal dust collecting element with a plastic component that achieves electrostatic conductivity through electrical grounding. The power ground wire connected to the machine tool body provides the grounding pathway, eliminating the need for expensive metal processing while maintaining the same electrostatic protection effect.
4Productivity
If conventional dust collection system is used, then dust collection function is achieved, but static electricity accumulates causing safety hazards
Solution Approach 1:
The power ground wire acts as an intermediary between the dust collecting element and the ground. It provides a dedicated pathway for static electricity to flow to ground without interfering with the dust collection function. This intermediary grounding system allows the dust collection system to operate normally while continuously dissipating accumulated static electricity.
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 discharges and reducing costs, without altering the machine's structure or requiring anti-static devices, while maintaining the tool's usability and safety.
Implementation Method 1
the charge conducting element conducts the electrostatic charge to the power ground wire
Implementation Method 2
a static dissipative material that is less than 30% of the dust collecting element's composition
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An electric tool grinding machine (20) with static electricity dissipation, the electric tool grinding machine (20) includes a machine tool body (21), a motor (22) disposed in the machine tool body (21), a power supply unit (23) disposed in the machine tool body (21) and connected to the motor (22), a grinding disc (24) rotating with the motor (22), and a dust collecting element (25) facing the grinding disc (24) and assembled with the machine tool body (21). The power supply unit (23) includes a power ground wire (232). The machine tool body (21) includes a charge conducting element (211) contacting the dust collecting element (25), and the charge conducting element (211) is electrically connected to the power ground wire (232) by one of the following: direct connection and indirect connection, when an electrostatic charge is generated on the dust collecting element (25), the charge conducting element (211) conducts the electrostatic charge to the power ground wire (232).