Floating Cleaning Head Sealing for Uneven Robot Surfaces
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Solution Overview
Problem
Existing mobile cleaning robots face challenges in maintaining effective suction and navigating uneven surfaces due to air leakages and inability to reach debris in corners and small features, leading to inefficient cleaning operations.
Innovation Solution
A mobile cleaning robot design featuring a monolithic housing with a diaphragm and suspension linkage that allows the cleaning head to float on the surface, reducing air leakages and enabling the cleaning extractors to extend across the entire width of the robot, with a corner brush and flexible design to reach debris in corners and undulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cleaning head is rigidly attached to the chassis, then structural stability is improved, but the ability to follow surface contours and maintain suction on uneven surfaces deteriorates
Solution Approach 1:
The cleaning head is divided into separate functional components: a rigid frame attached to the chassis, a flexible diaphragm for sealing, and a movable monolithic housing containing the extractors. This segmentation allows different parts to serve different functions - the rigid frame provides structural stability while the flexible diaphragm and movable housing enable adaptation to surface contours.
Solution Approach 2:
The cleaning head transitions from a static rigid structure to a dynamic system where the monolithic housing can move independently of the chassis through the suspension linkage, and the diaphragm can flex to maintain sealing. This dynamic capability allows the cleaning head to adapt to varying surface conditions while maintaining structural integrity.
2Adaptability or versatility
If the cleaning head is suspended to follow surface contours, then adaptability to uneven surfaces is improved, but structural stability and suction consistency deteriorate due to air leakages
Solution Approach 1:
A flexible diaphragm is used as a sealing element between the movable monolithic housing and the rigid frame. This thin flexible film can deform to maintain airtight sealing even when the housing moves to follow surface contours, preventing air leakages and maintaining suction consistency despite the dynamic positioning.
Solution Approach 2:
The diaphragm acts as an intermediary sealing element that bridges the gap between the rigid frame and the movable monolithic housing. It mediates the connection, allowing relative movement while maintaining the pneumatic seal necessary for consistent suction performance.
3Area of stationary object
If the cleaning extractors are positioned to cover the entire width, then cleaning area per pass is improved, but the ability to reach corners and small features deteriorates
Solution Approach 1:
The monolithic housing containing the cleaning extractors is made movable through the suspension linkage, allowing it to dynamically adjust its position and orientation. This enables the wide cleaning extractors to reach into corners and adapt to small features while maintaining full-width coverage for efficient cleaning.
Solution Approach 2:
The cleaning system uses different mechanisms for different regions: the corner brush with motor positioned at the corners for targeted corner cleaning, and the full-width cleaning extractors for main area cleaning. This local specialization allows the system to effectively handle both corner features and large cleaning areas.
4Productivity
If a corner brush with motor is added to reach corners, then cleaning effectiveness in corners is improved, but device complexity increases
Solution Approach 1:
The corner brush motor is integrated into the monolithic housing structure, merging the corner cleaning function with the main cleaning head assembly. This consolidation reduces the need for separate corner cleaning mechanisms and simplifies the overall device structure while maintaining enhanced corner cleaning capability.
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
The design enhances suction efficiency by minimizing air leakages, allows the robot to follow surface contours, and effectively cleans edges and corners, increasing the cleaning area covered per pass and reducing the need for multiple trips.
Implementation Method 1
a diaphragm formed of a flexible material and mated to the monolithic housing
Implementation Method 2
a suspension linkage movably suspending the monolithic housing from the frame, the suspension linkage being configured to lift the monolithic housing
Data Source
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AI summary
This document describes a mobile cleaning robot that includes a chassis that supports a drive system, a debris collection volume; and a cleaning head formed to complete a bottom of the robot. The cleaning head includes a frame for affixing the cleaning head to the chassis, a monolithic housing having an interior cavity, a suspension linkage movably suspending the monolithic housing from the frame, the suspension linkage being configured to lift the monolithic housing, a diaphragm formed of a flexible material and mated to the monolithic housing, a rigid duct mated the frame to form a pneumatic path between the monolithic housing and the rigid duct through the diaphragm, and cleaning extractors disposed in the interior cavity of the monolithic housing.