Sorting Machine Carriage Positioning via Magnetic Field Detection
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Solution Overview
Problem
Prior art cross-belt sorting machines face challenges in ensuring precise positioning of carriages relative to loading and unloading stations due to dynamic variations caused by thermal expansion and tensioning conditions, leading to potential misalignment and transmission errors.
Innovation Solution
Incorporation of permanent magnets and Hall effect transducers to generate and detect stationary magnetic fields, allowing for accurate real-time monitoring and synchronization of carriage positions, enabling precise timing of loading and unloading operations without physical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior art control systems are used to monitor carriage positions, then the system structure remains simple, but positioning precision deteriorates due to thermal expansion and tensioning variations
Solution Approach 1:
The patent replaces mechanical position sensing methods with magnetic field-based detection. Permanent magnets mounted on carriages interact with Hall effect sensors at stations to determine carriage position and timing, eliminating the need for complex mechanical encoders or continuous physical measurement systems that are sensitive to thermal expansion and tensioning variations.
Solution Approach 2:
The magnetic field detection system serves multiple functions: it determines carriage position, synchronizes loading/unloading operations, and provides timing information for signal transmission. This single magnetic detection mechanism replaces what would otherwise require multiple separate sensing systems, maintaining simplicity while improving precision.
2Reliability
If continuous monitoring of carriage positions is implemented to ensure precise synchronization, then positioning accuracy improves, but system complexity and cost increase
Solution Approach 1:
Instead of continuous monitoring, the system uses periodic magnetic field detection at specific locations (loading/unloading stations). The Hall effect sensors detect the magnetic fields of approaching carriages at predetermined intervals, providing sufficient synchronization information without requiring continuous tracking throughout the entire carriage path.
Solution Approach 2:
The permanent magnets on carriages continuously generate magnetic fields that passively provide positioning information to the stationary Hall effect sensors. The system leverages the inherent magnetic field presence without requiring active transmission or complex processing, allowing the moving carriages to essentially 'serve' their own positioning function.
3Ease of manufacture
If mechanical contact systems are used for signal transmission between stations and carriages, then system construction is straightforward, but misalignment and transmission errors increase
Solution Approach 1:
The patent replaces mechanical contact-based signal transmission with magnetic field-based detection. The permanent magnets on carriages and Hall effect sensors at stations enable contactless determination of carriage position and timing, eliminating wear, misalignment issues, and transmission errors associated with mechanical contact systems while maintaining ease of construction.
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
This solution ensures accurate and efficient loading and unloading operations by automatically determining the optimal moment for signal transmission, reducing the risk of errors and system malfunctions, while simplifying the construction and installation of the sorting machine.
Implementation Method 1
Each carriage (2) comprises a permanent magnet (4c) which generates a stationary magnetic field
Implementation Method 2
each actuating unit (11) comprises a Hall effect transducer (12) configured to detect the presence of the stationary magnetic field generated by the permanent magnet (4c)
Data Source
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AI summary
Described is a sorting machine comprising: a plurality of carriages (2), each carriage (2) comprising a loading-unloading device (3) which can be selectively activated for loading-unloading an object (O) from the carriage (2) and an electronic unit (4) configured to receive and analyse a loading-unloading signal and actuate the loading-unloading device (3) as a function of an operating mode, selected from a plurality of operating modes and uniquely associated with the loading-unloading signal; a plurality of loading stations (9) and a plurality of unloading stations (10) positioned along a sorting direction (X) comprising respective actuating units (11) configured to generate the loading-unloading signal. Each carriage (2) comprises a permanent magnet (4c) which generates a stationary magnetic field and each actuating unit (11) comprises a Hall effect transducer (12) configured to detect the presence of the stationary magnetic field generated by the permanent magnet (4c).