Limited Rotation Drum Pet Cat Excrement Screening Device
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Solution Overview
Problem
Existing drum-type automatic pet cat toilets based on gravity screening face safety issues due to probabilistic sensor failures, leading to sudden drum rotation and potential harm to the pet cat during excretion, as the drum's shearing effect can injure the cat.
Innovation Solution
A pet cat excrement screening device with a drum that rotates less than 360 degrees, featuring a pet inlet exposed during rotation to allow the cat to escape, a screening mechanism with a spiral collection bin and screening net to separate excrement from litter, and an incomplete driven gear to prevent full rotation, ensuring the cat's safety and efficient waste disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If sensor detection and software algorithms are used to ensure pet safety, then automation and efficiency are improved, but reliability deteriorates due to probabilistic sensor failures causing sudden drum rotation
Solution Approach 1:
The patent replaces the sensor-based software control system with a pure mechanical solution. The drum is designed with a limited rotation angle structure that physically prevents full rotation, and the cat flap provides a mechanical escape route. This mechanical substitution eliminates reliance on sensors and algorithms, resolving the reliability issue while maintaining automation through the mechanical screening mechanism.
Solution Approach 2:
The patent implements beforehand cushioning by designing the drum with a maximum rotation angle less than 360 degrees and providing a cat flap escape route in advance. These safety features are built into the mechanical structure before operation, ensuring that even if failures occur, the cat cannot be harmed by shearing forces and can escape if needed.
2Reliability
If the drum rotates less than 360 degrees, then safety is improved by preventing shearing effects, but productivity deteriorates due to limited screening capacity
Solution Approach 1:
The patent applies dynamics by making the drum rotatable with a controlled limited angle rather than fixed. The drum can rotate back and forth within the limited angle range, dynamically adjusting its position to screen excrement effectively while never reaching the dangerous 360-degree position. This dynamic motion maintains both safety and screening efficiency.
3Reliability
If a pet inlet is exposed during drum rotation, then safety is improved by allowing cat escape, but device complexity increases due to additional structural requirements
Solution Approach 1:
The patent applies segmentation by dividing the drum structure into segments that include the cat flap opening. The drum wall is segmented to provide an escape route, and the limited rotation angle is achieved by segmenting the drum's rotational path. This segmentation approach integrates safety features into the basic structure rather than adding separate complex systems.
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 device ensures the pet cat's safety by allowing it to escape if the drum rotates unexpectedly and effectively separates and disposes of excrement, preventing shearing hazards and ensuring efficient litter and excrement separation.
Implementation Method 1
drum-type automatic pet cat toilets based on the principle of gravity screening
Implementation Method 2
The spiral collection bin has a helicoid spirally curved towards the waste discharge port... the helicoid is configured to guide the excrement into the waste discharge outlet with rotation of the drum
Data Source
AI summary
Provided is a pet cat excrement screening device. The pet cat excrement screening device includes a support base; a drum rotatably mounted on the support base; and a drum driving device mounted on the support base. The drum is configured to rotate between a first position and a second position under drive of the drum driving device, where the rotation angle of the drum is less than 360 degrees. A side wall of the drum body of the drum is provided with a pet inlet. The pet inlet is exposed out of the support base during a rolling process of the drum. A screening mechanism is mounted in the drum. The rear end of the drum is provided with a waste discharge port.