Suspended Cleaning Head Sealing for Surface-Adaptive Robot Suction
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Solution Overview
Problem
Existing mobile cleaning robots face challenges in effectively navigating and cleaning surfaces with undulations and contours due to air leakages and inefficient debris collection, as their cleaning heads often lose contact with the surface, leading to reduced suction and incomplete cleaning.
Innovation Solution
A mobile cleaning robot design featuring a monolithic housing with a suspension linkage and diaphragm that allows the cleaning head to float on the surface, maintaining contact with undulations and reducing air leakages, combined with a pneumatic path sealed by a diaphragm and rigid duct, enabling stronger suction and efficient debris collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cleaning head is rigidly affixed to the chassis, then the structure is simple and stable, but the cleaning head cannot adapt to surface undulations and loses contact, causing air leakages and reduced suction
Solution Approach 1:
The cleaning head is transformed from a rigid structure to a dynamic, movable one through the suspension linkage system. The monolithic housing can move independently relative to the chassis, allowing the cleaning extractors to maintain contact with undulating surfaces while the robot body remains stable. This dynamic configuration resolves the contradiction by enabling adaptability without compromising overall structural stability.
Solution Approach 2:
The cleaning head is segmented into a movable monolithic housing portion containing the cleaning extractors, separated from the main chassis through the suspension linkage. This segmentation allows the cleaning portion to independently adapt to surface variations while the main body remains stable, resolving the contradiction between adaptability and structural simplicity.
2Reliability
If the monolithic housing moves independently on the surface, then contact with undulations is maintained and air leakages are reduced, but the pneumatic path complexity increases due to the need for flexible sealing
Solution Approach 1:
A flexible diaphragm is used to seal the pneumatic path between the movable monolithic housing and the rigid duct. This flexible membrane allows the housing to move independently on surface undulations while maintaining an airtight seal, preventing air leakages and ensuring reliable suction without requiring complex rigid sealing mechanisms.
Solution Approach 2:
The flexible diaphragm acts as an intermediary element between the movable monolithic housing and the fixed rigid duct. It mediates the relative motion between these two components while maintaining the pneumatic seal, enabling independent movement without compromising suction effectiveness.
3Productivity
If the cleaning extractors are positioned at the forward portion across the lateral axis, then cleaning coverage is maximized, but the corner brush positioning becomes more complex
Solution Approach 1:
The cleaning extractors are positioned asymmetrically at the forward portion, extending across the lateral axis to maximize cleaning coverage. The corner brush is strategically positioned between the leading edge and the extractors, creating an asymmetric arrangement that optimizes both coverage and corner cleaning effectiveness without requiring complex additional mechanisms.
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 power and ensures effective debris collection by maintaining contact with the cleaning surface, reducing air leakages, and allowing the cleaning head to adapt to surface contours, thereby improving cleaning efficiency and coverage.
Implementation Method 1
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
Implementation Method 2
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
Data Source
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.