Sealed Pick-Up Head With Rotatable Door for Full Suction
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Solution Overview
Problem
Existing pick-up heads for sidewalk and factory floor sweepers struggle to maintain full suction of dust and small debris when larger debris enters, leading to reduced airflow and incomplete cleaning due to air ingress through front openings.
Innovation Solution
A sealed pick-up head design with a rotatable door mechanism and sealing means that prevents air ingress while allowing larger debris to enter, maintaining full suction by using a housing with a suctioning front opening and a dust and debris outlet for efficient debris collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a front opening is provided to permit larger debris to enter the pick-up head, then larger debris can be collected, but air flows through the front opening which reduces suction for dust and small debris
Solution Approach 1:
The front opening is segmented into two functional zones: an upper debris intake opening for larger debris and a lower suction opening for dust and small debris. This segmentation allows each opening to serve its specific purpose independently, preventing air from the debris opening from interfering with the dust suction airflow.
Solution Approach 2:
Different parts of the front opening have different functions and airflow characteristics. The upper portion handles debris intake while the lower portion maintains controlled airflow for dust suction. This local differentiation of function resolves the contradiction by allowing each zone to optimize for its specific purpose.
2Productivity
If the bottom edge of the pick-up head is positioned close to the surface, then dust and small debris can be effectively suctioned, but larger debris cannot pass underneath
Solution Approach 1:
The pick-up head is segmented into a lower section for dust suction (with bottom edge close to surface) and an upper front opening for larger debris intake. This vertical segmentation allows the bottom edge to maintain close clearance for effective dust suction while the upper opening provides access for larger debris that cannot pass underneath.
Solution Approach 2:
The solution moves from a two-dimensional bottom-edge clearance problem to a three-dimensional solution by adding a vertical component - the upper front opening. This allows larger debris to enter through the upper dimension while the lower dimension maintains close clearance for dust suction.
3Adaptability or versatility
If a door is opened to permit debris to egress into the pick-up head, then larger debris can be collected, but significant air suctioning occurs through the front opening which reduces full suctioning
Solution Approach 1:
The door mechanism is segmented into a rotatable door portion and a fixed frame portion. The rotatable door is sealed to the frame, creating a controlled opening that can rotate to admit debris while maintaining the seal. This prevents uncontrolled air ingress that would occur with a simple open door, thus reducing energy loss while still allowing debris collection.
Solution Approach 2:
The sealed rotatable door acts as an intermediary between the external environment and the pick-up head interior. It controls the admission of debris while preventing uncontrolled air flow, thus mediating between the need to collect larger debris and the need to maintain suction efficiency.
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 sealed pick-up head effectively captures larger debris while maintaining full airflow suction, ensuring thorough cleaning of surfaces by preventing air from entering the housing during debris intake.
Implementation Method 1
dust and small debris are initially passed over by the front of the pick-up head and are suctioned into the pick-up head through its bottom opening
Data Source
AI summary
A sealed pick-up head for a mobile sweeper comprises a housing defining a substantially hollow interior and a suctioning bottom opening. A suctioning front opening is for receiving debris into the substantially hollow interior of the housing. A door frame surrounds the suctioning front opening. A rotatable door has at least a first door portion and a second door portion joined together at a central pivot axis, and is operatively mounted at the central pivot axis in rotatable relation on the pick-up head at the suctioning front opening. A seal is operatively disposed between the rotatable door and the door frame for sealing the rotatable door with respect to the door frame, to thereby substantially preclude air from ingressing into the substantially hollow interior of the housing through the suctioning front opening, as the rotatable door rotates to permit debris to enter the substantially hollow interior of the housing. A dust and debris outlet in the housing permits dust and debris to be suctioned from the substantially hollow interior of the housing into a hopper.