Side Brush with Integrated Wiping Pad for Robot Boundary Cleaning
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Solution Overview
Problem
Existing cleaning robots face challenges in effectively cleaning up to lateral boundaries, particularly corners, due to complex mechanics and adaptation issues with laterally shifted mopping pads, limiting both dry and wet cleaning capabilities.
Innovation Solution
A rotatable side brush with a hub and brush arms extending radially, integrated with a wiping pad, allows for seamless cleaning up to lateral boundaries without major mechanical modifications, enabling both dry and wet cleaning, and includes features like torque-locking connections and flexible brush arms for obstacle navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a mopping pad is moved laterally to clean up to boundaries, then cleaning coverage is improved, but device complexity increases
Solution Approach 1:
The cleaning function is segmented between the main mopping pad for general cleaning and a separate side brush assembly with its own wiping pad for boundary cleaning. This segmentation allows each component to perform its specific function independently without requiring complex lateral movement mechanisms, thereby maintaining simplicity while expanding overall cleaning coverage.
Solution Approach 2:
The side brush assembly serves multiple functions: it performs dry cleaning with brush arms, wet cleaning with the wiping pad, and can clean lateral boundaries and corners that the main mopping pad cannot reach. This multi-functionality eliminates the need for separate boundary cleaning mechanisms, reducing overall device complexity.
2Adaptability or versatility
If a side brush with wiping pad is added, then wet and dry cleaning capability is improved, but device complexity increases
Solution Approach 1:
The side brush assembly merges dry cleaning (brush arms) and wet cleaning (wiping pad) functions into a single integrated unit that rotates with the hub. This combination eliminates the need for separate mechanisms for dry and wet cleaning, reducing mechanical complexity while maintaining versatility.
Solution Approach 2:
The hub is mounted to allow axial movement, enabling the side brush assembly to dynamically adapt to obstacles by deflecting upwards. This dynamic capability allows the cleaning robot to maintain its course without lifting off the floor surface, enhancing versatility without requiring complex suspension systems.
3Reliability
If the hub is made movable axially to navigate obstacles, then reliability is improved, but control precision worsens
Solution Approach 1:
An elastic element is provided to pre-tension the hub towards the floor surface with a predetermined force. This pre-tensioning acts as a cushion that allows controlled deflection when encountering obstacles while maintaining consistent cleaning pressure during normal operation, thus preserving both reliability and control precision.
4Adaptability or versatility
If the brush arm is made flexible to navigate stationary objects, then adaptability is improved, but structural strength worsens
Solution Approach 1:
The brush arm is designed to be flexible in the plane of rotation, allowing it to bend and deflect when encountering stationary objects. This flexibility enables the cleaning pad to advance to objects that would otherwise block cleaning, improving adaptability while the flexible design itself provides sufficient structural integrity for the application.
Data Source
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AI summary
A side brush (135) for a cleaning robot (100) is rotatable about a rotation axis (140) extending in a vertical direction; the side brush (135) comprising the following elements: a hub (145) through which the rotation axis (140) passes; at least one brush arm (150) extending radially from the hub (145); and a wiping pad (155) located axially below the hub (145); the brush arm (150) projecting beyond a radial boundary of the wiping pad (155).