Self-Cleaning Coin Hopper with Reversing Turntable
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Solution Overview
Problem
Coin processing machines require manual removal of debris such as bent or oversized coins, nuts, and bolts from the rotating turntable, which is a labor-intensive process.
Innovation Solution
A second opening in the circumferential wall of the intake hopper allows debris to be discharged automatically after the coins have been processed, utilizing a diverter plate to direct debris through this opening when the turntable reverses direction for cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single opening is provided in the circumferential wall for coin discharge, then the hopper structure is simple, but debris accumulates on the turntable requiring manual removal
Solution Approach 1:
The single opening in the circumferential wall is segmented into two functional openings: a first opening for coin discharge and a second opening for debris discharge. This segmentation allows the hopper to simultaneously handle both coin processing and self-cleaning functions, eliminating manual debris removal while maintaining structural simplicity
Solution Approach 2:
The circumferential wall with multiple openings serves multiple functions: the first opening discharges coins during normal operation, while the second opening discharges debris during reverse rotation. This multi-functionality resolves the contradiction by enabling automatic debris removal without significantly complicating the hopper structure
2Productivity
If the turntable rotates continuously in the discharge direction, then coin processing is efficient, but debris remains on the turntable
Solution Approach 1:
The turntable rotation is changed from continuous unidirectional motion to periodic bidirectional motion. During normal operation, the turntable rotates in the discharge direction for efficient coin processing. After coin discharge completes, it reverses direction to rotate in the cleaning direction, periodically removing debris through the second opening. This periodic action resolves the contradiction between productivity and debris accumulation
3Reliability
If a diverter plate is added to block the second opening during coin discharge, then coins are prevented from escaping, but the device complexity increases
Solution Approach 1:
The diverter plate is designed as a movable component that dynamically changes position based on turntable rotation direction. During coin discharge, it blocks the second opening to prevent coin escape. During reverse rotation, it moves away to allow debris discharge. This dynamic positioning provides reliable coin discharge control while minimizing structural complexity through a single movable component
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
Enables automatic and efficient removal of debris from the turntable without manual intervention, improving operational efficiency and reducing labor costs.
Implementation Method 1
Centrifugal force urges the coins against the wall
Data Source
AI summary
A hopper for a coin processing machine has a turntable that receives coins and rotates in a first direction to discharge coins from the hopper. A circumferential wall surrounds the turntable, and includes a coin discharge opening and a second opening. A diverter plate extends away from the wall upstream of the second opening. The diverter plate blocks coins from entering the second opening when the turntable rotates in the first direction. The diverter plate directs any debris remaining on the turntable to the second opening when the turntable rotates in the opposite, second direction after discharging all the coins from the hopper.