Zip Line Trolley Eccentric Magnet Braking
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Solution Overview
Problem
Existing zip line trolley systems lack a compact and efficient means to reduce speed during travel, relying on friction-based mechanisms that lead to wear and requiring external deceleration devices.
Innovation Solution
A trolley with a frame made from electrically conductive material and pulleys featuring permanent magnets positioned eccentrically, generating a braking force through turbulent current flow, eliminating the need for friction elements and allowing adjustable braking force via magnet placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If friction-based braking mechanisms are used, then braking force can be generated, but wear occurs and reliability decreases
Solution Approach 1:
The patent replaces the mechanical friction-based braking system with an electromagnetic braking system. Permanent magnets are positioned eccentrically on the pulley, and when the pulley rotates, the changing magnetic field induces turbulent eddy currents in the conductive frame, which generate a braking force opposite to the direction of motion. This eliminates direct mechanical contact and friction, thereby preventing wear and improving reliability.
2Force
If complex mechanical braking structures are used, then braking force can be controlled, but device complexity increases
Solution Approach 1:
The patent eliminates complex mechanical braking structures by using electromagnetic principles. The braking force is controlled by adjusting the position, strength, or number of permanent magnets on the pulley, rather than using complex mechanical linkages or adjustable friction elements. This simplifies the overall device structure while maintaining controllability of the braking force.
Solution Approach 2:
The braking force can be adjusted by changing parameters of the permanent magnets (such as their position, strength, or number) rather than adjusting complex mechanical components. This allows for simple and effective control of braking force magnitude without increasing structural complexity.
3Force
If friction brakes are used, then braking is achieved, but heat generation affects bearing surfaces
Solution Approach 1:
The patent replaces friction-based heat generation with electromagnetic induction. The turbulent eddy currents are generated in the frame due to the rotating magnetic field from the eccentric permanent magnets. The heat is generated in the frame material rather than at the pulley bearing surfaces, keeping the bearings cool and preventing thermal degradation of lubrication and bearing components.
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 provides a compact, frictionless braking system that adjusts braking force based on speed, reducing wear and eliminating the need for complex mechanical structures, enabling efficient speed control without overheating the pulley bearings.
Implementation Method 1
the motion of the permanent magnet relative to the frame of the trolley causes turbulent flow of current in the frame
Implementation Method 2
the motion of the permanent magnet relative to the frame of the trolley causes turbulent flow of current in the frame
Data Source
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AI summary
The invention regards a trolley for a zip line system. The trolley (1, 1') comprises a frame in which at least one pulley (4, 4', 4") is rotatably supported, wherein the frame is made from an electrically conductive material and wherein the trolley (1, 1') comprises at least one permanent magnet (16) that is positioned in an eccentric manner with respect to the rotation axis of the pulley (4, 4', 4") to induce turbulent flow of current in the frame in order to generate a speed dependent braking force.