Ferromagnetic Worm Drive Transfer Device for High-Speed Carriage Positioning
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Solution Overview
Problem
High-precision transfer devices for moving parts on immobilized pallets face challenges with controlling linear electric motors, which are costly and difficult to control, and guiding carriages efficiently, making it hard to increase nominal linear movement speed under economic conditions.
Innovation Solution
A transfer device with a central structure featuring transport segments equipped with ferromagnetic helical worms that attract permanent magnets on carriages, allowing for precise movement and positioning without external power, combined with a stop device for locking carriages in place, and using carrousels for transferring carriages between segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If linear electric motors are used to increase linear speed, then speed increases, but control difficulty and cost increase
Solution Approach 1:
The patent replaces linear electric motors with a mechanical drive system consisting of a worm gear and permanent magnets. The worm gear converts rotational motion to linear motion mechanically, while permanent magnets provide holding force without requiring complex electronic control systems. This substitution resolves the contradiction by achieving high speed through mechanical means while avoiding the control complexity of electric motors.
Solution Approach 2:
The permanent magnets on the carriage interact with the ferromagnetic worm gear to provide both propulsion and holding functions. The system uses the magnetic attraction between the permanent magnets and the ferromagnetic material to automatically hold the carriage in position without requiring additional brakes or control systems, thereby reducing overall device complexity while maintaining high speed capability.
2Speed
If linear electric motors are used to increase linear speed, then speed increases, but cost increases
Solution Approach 1:
The patent uses inexpensive permanent magnets and a simple ferromagnetic worm gear instead of costly linear electric motors. These components are mass-producible, durable, and significantly cheaper than linear motor systems while achieving the same functional goals of high speed and precise positioning.
Solution Approach 2:
By replacing expensive electric motors with a mechanical worm gear drive system, the patent achieves cost reduction. The mechanical system uses simple, well-established components that are easier and cheaper to manufacture and maintain compared to sophisticated linear motor assemblies.
3Device complexity
If friction-based belt drives are used, then simplicity is maintained, but speed is limited to 1 meter per second
Solution Approach 1:
The patent replaces friction-based belt drives with a positive engagement worm gear system. The worm gear meshes directly with the ferromagnetic perimeter, providing mechanical advantage and enabling higher speeds without relying on friction limits. This substitution maintains mechanical simplicity while breaking the speed barrier of 1 meter per second.
Solution Approach 2:
The permanent magnets are pre-positioned on the carriage to align with the ferromagnetic helical perimeter of the worm gear. This preliminary magnetic alignment ensures immediate and reliable engagement when the worm gear rotates, enabling high-speed operation without the slip and delay inherent in friction-based 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
Enables efficient, precise, and cost-effective high-precision movement of carriages, reducing the need for external power and mechanical attachments, while maintaining stability and flexibility in production line configurations.
Implementation Method 1
the carriage being held in place on the transport segment by the attraction between the permanent magnets and the worm
Data Source
AI summary
The transfer device comprises a central structure (20) having at least one transport segment (S21, S22, S23) with drive means (30-1, 30-2, 30-3). The transport segment is intended to receive a carriage (C1, C2, C3) which is mounted so as to be movable with respect to the central structure in a direction of movement. Said carriage has a plate bearing a series of permanent magnets in the direction of movement. The drive means (30) comprise a worm (30-1, 30-2, 30-3) along the transport segment (S21, S22, S23), said worm comprising a ferromagnetic helical perimeter, being mounted so as to be rotatable about an axis parallel to said direction of movement, and being arranged such that the successive turns of the helical perimeter are adjacent to at least some of the permanent magnets of said series.