Robot Debris Bin Flap Door Design for Pressure-Actuated Evacuation
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Solution Overview
Problem
Existing cleaning robots face challenges in efficiently evacuating debris from their bins without causing damage or reducing air flow efficiency, and existing evacuation stations require manual manipulation and generate noise during operation.
Innovation Solution
A mobile robot with a debris bin featuring a semi-spherical support structure and a flap door mechanism that opens in response to air pressure, combined with an evacuation station that uses negative air pressure and a deformable seal for efficient debris transfer and reduced noise, along with a removable conduit for easy cleaning and adaptive control systems for optimized evacuation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional door mechanism is used for the debris bin, then the structure is simple, but the door may contact external objects causing damage or blocking air flow
Solution Approach 1:
The door unit is nested within the exterior surface of the mobile robot, with the flap contained inside a recessed cavity. This nesting arrangement ensures the door mechanism does not protrude outward, eliminating contact damage risks while maintaining structural simplicity through integrated design.
Solution Approach 2:
The door mechanism transitions from a traditional planar door to a three-dimensional flap system that moves within a recessed cavity. The semi-spherical support structure enables the flap to pivot in a controlled arc, utilizing spatial dimensionality to achieve reliable sealing without external protrusion.
2Ease of operation
If manual manipulation is required for evacuation station operation, then device complexity is reduced, but user interaction increases and noise generation occurs
Solution Approach 1:
The evacuation station implements automated operation through a control system that autonomously manages the motor, pressure sensor, and conduit mechanisms. The system self-regulates the evacuation process by monitoring air pressure and controlling debris transfer without requiring user intervention, thereby reducing operational complexity through integration.
Solution Approach 2:
The pressure sensor provides real-time feedback to the control system, enabling automated adjustment of the evacuation process. The control system uses this feedback to optimize motor operation and timing, achieving ease of operation through intelligent control while managing device complexity through coordinated sensor-actuator systems.
3Productivity
If evacuation time is extended to ensure complete debris removal, then evacuation thoroughness improves, but power consumption and noise increase
Solution Approach 1:
The evacuation process uses periodic motor operation controlled by the pressure sensor feedback system. The motor operates in cycles, activating when debris needs evacuation and pausing when the air pressure differential is sufficient, thereby achieving thorough evacuation with reduced power consumption and noise through intermittent rather than continuous operation.
Solution Approach 2:
The system prepares for evacuation by first establishing the negative air pressure differential through the motor, then uses this pre-established pressure field to efficiently remove debris. This preliminary action of creating the pressure gradient enables faster, more energy-efficient evacuation compared to continuous motor 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
The solution ensures efficient debris evacuation without contact damage, improves air flow, reduces noise, and minimizes user manipulation, while adapting evacuation time for power efficiency and reduced noise generation.
Implementation Method 1
a motor that is responsive to commands from the control system to remove air from the canister and thereby generate negative air pressure in the canister to evacuate the debris bin by suctioning the debris from the debris bin
Implementation Method 2
a deformable seal for efficient debris transfer and reduced noise
Implementation Method 3
a pressure sensor to monitor the air pressure. The control system is programmed to control an amount of time to evacuate the debris bin based on the air pressure monitored by the pressure sensor
Data Source
AI summary
A mobile robot includes a body configured to traverse a surface and to receive debris from the surface, and a debris bin within the body. The debris bin includes a chamber to hold the debris received by the mobile robot, an exhaust port through which the debris exits the debris bin; and a door unit over the exhaust port. The door unit includes a flap configured to move, in response to air pressure at the exhaust port, between a closed position to cover the exhaust port and an open position to open a path between the chamber and the exhaust port. The door unit, including the flap in the open position and in the closed position, is within an exterior surface of the mobile robot.