Pneumatic sanding machine with automatic start-up of a dust extractor
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Solution Overview
Problem
Current suction solutions for pneumatic sanders in car body repair workshops face challenges such as high costs due to complex and expensive ATEX compliance, frequent maintenance issues, clogging of collection bags and filters, and high air consumption causing disturbances in compressed air networks, which affects the ergonomics and performance of the equipment.
Innovation Solution
A pneumatic connection module that automatically starts and stops the suction device based on the sander's operation, using a movable obturator and spring element to control air passages, allowing compressed air to flow to both the sander and suction device without electrical components, thus optimizing air consumption and reducing network disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pneumatic sander is connected to a suction device on a compressed air network, then dust suction is achieved, but air consumption is very high causing disturbances throughout the compressed air network
Solution Approach 1:
The suction device is pre-connected to the compressed air network but kept inactive by a closed valve. The valve opens automatically when the sander is activated, enabling suction only when needed. This preliminary setup with conditional activation reduces unnecessary air consumption and network disturbances.
Solution Approach 2:
The system uses the sander's own air consumption to automatically trigger the suction device. When the sander activates and consumes compressed air, this same air flow activates the valve that opens the suction device, creating a self-regulating system that synchronizes suction with sanding operation.
2Reliability
If electrical sanders are used to comply with ATEX standard, then safety in the presence of aluminium dust is improved, but the cost and complexity of insulation increases
Solution Approach 1:
The patent replaces electrical sanders with a purely pneumatic sander driven by compressed air. This substitution eliminates the need for complex ATEX insulation while maintaining safety in the presence of aluminium dust, as pneumatic systems generate no sparks or electrical emissions that could ignite dust.
Solution Approach 2:
The pneumatic sander operates entirely with compressed air, creating an inert environment that cannot ignite aluminium dust. This eliminates the explosion hazard associated with electrical motors in dusty environments, providing inherent safety without requiring additional insulation or protective measures.
3Adaptability or versatility
If electrical sanders are used for mobile sets, then versatility is improved, but the weight increases affecting ergonomics
Solution Approach 1:
The patent replaces the electrical motor with a pneumatic motor, eliminating the heavy electrical components, battery, and insulation required for ATEX compliance. The pneumatic sander is significantly lighter while maintaining mobile set versatility, as it connects to the existing compressed air network in the workshop.
4Ease of operation
If pneumatic sanders are used, then ergonomics and safety are improved, but high air consumption generates disturbances on the compressed air network
Solution Approach 1:
The suction device is pre-configured and connected but kept inactive until needed. The automatic valve activation ensures suction only operates when the sander is running, minimizing unnecessary compressed air consumption and reducing disturbances on the network during non-sanding periods.
Solution Approach 2:
The suction device operates periodically, activating only when the sander is in use and deactivating when the sander stops. This periodic operation synchronized with the sanding cycles reduces overall air consumption and minimizes network disturbances compared to continuous 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
This solution provides a cost-effective, low-maintenance, and efficient suction performance compliant with ATEX standards, minimizing disturbances in the compressed air network while maintaining high vacuum performance without electrical components.
Implementation Method 1
a movable obturator mounted in the internal pipe, said movable obturator being in the idle position when said sander is stopped, and forced by a spring element to at least partially close the first air passage and the second air passage
Implementation Method 2
when the sander is started up, said compressed-air source delivers compressed air in said first air passage to force said movable obturator against said spring element so as to open the first air passage
Data Source
AI summary
A pneumatic sander includes a suction device and a connection module. The connection module includes: an internal pipe having an air inlet connectable to a compressed-air source; a first air outlet supplying the sander with air via a first air passage; a second air outlet supplying the suction device with air via a second air passage; and a movable obturator mounted in the internal pipe. On start up, the air source delivers compressed air in the first air passage to force the obturator against a spring element to enable airflow to pass to the first air outlet and then to the sander, and at the same time to allow airflow to pass to a motor of the suction device, causing the suction device to suck dust from the sander. When the sander is stopped, the spring element forces the obturator towards an idle position to close the air passages.