Hand Grinder Suction Hood With Switchable Airflow for Wall Sanding
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Solution Overview
Problem
Existing motor-driven hand-held sanding devices experience disruptive suction effects when sanding surfaces other than ceilings, as the negative pressure designed for ceiling sanding is not adjustable for other surfaces like walls.
Innovation Solution
An annular, circumferential suction gap is created between the sanding disc and the suction hood, connected to a second air path, with an adjustable device that can block or free either airway, allowing for adjustable suction modes suitable for ceiling and wall sanding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the suction device creates negative pressure under the sanding pad for ceiling sanding, then the sanding device is held firmly against the ceiling and dust is extracted effectively, but the suction effect becomes disruptive when sanding walls or other surfaces
Solution Approach 1:
The suction hood is made adjustable between different positions (tiltable or movable) to change the orientation and configuration of the suction openings relative to the sanding pad. This allows the device to adapt its suction characteristics for different working surfaces such as ceilings, walls, and floors, resolving the contradiction between firm holding on ceilings and adaptability for other surfaces.
Solution Approach 2:
The angle or orientation of the suction hood can be changed to modify the suction effect. By adjusting the hood's position, the negative pressure distribution changes, allowing effective ceiling sanding while reducing disruptive suction on vertical surfaces. This parameter adjustment enables the same device to perform optimally on different surface orientations.
2Productivity
If the suction effect is strong for effective dust extraction on ceilings, then dust particles are removed efficiently, but user comfort is reduced due to the suction force pulling the device upward
Solution Approach 1:
The suction system is divided into multiple independent suction openings distributed across the suction hood. This segmentation allows different regions to serve different functions: some openings optimized for dust extraction while others can be adjusted or positioned to provide downward pressure, balancing productivity and user comfort.
Solution Approach 2:
Different areas of the suction hood have different functions - some regions create negative pressure for dust extraction while other regions can be designed to create positive pressure or neutral zones that press the sanding pad against the surface. This local differentiation of suction characteristics resolves the contradiction between strong dust extraction and user comfort.
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 enables the sanding device to maintain effective suction for ceiling sanding while reducing or eliminating suction when sanding walls, improving user comfort and operational efficiency by allowing switching between suction and normal operation modes.
Implementation Method 1
a negative pressure occurs on the underside of the sanding pad held against the ceiling during operation, so that an upward suction force is created
Implementation Method 2
air can be drawn from the underside of the sanding pad by means of a suction device and sucked off through the throughflow openings and a subsequent airway
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Hand-operated grinding tool comprises a grinding plate (4) surrounded by a suction hood (32) which has a larger diameter than the plate. An annular suction gap (33) is formed between the outer periphery of the grinding plate and the suction hood and is connected to an airway (34) so that air can be sucked through the suction gag and airway. An adjusting device (35) is arranged between the airway and a further airway so that one airway can be blocked and the other left open. Preferred Features: The adjusting device is formed by a pivoting flap or a slide. Air openings (15) are arranged around an axis of rotation line (3).