Movable RFID Antenna Frame for Overhead Conveyor Identification
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Solution Overview
Problem
Existing overhead conveyor systems face inefficiencies in item identification due to manual scanning being labor-intensive and automatic scanning being slow and prone to human error, especially when items are closely packed, and interference from nearby RFID tags.
Innovation Solution
An in-transit identification system with a movable antenna frame connected to a guide track arrangement, capable of moving in two perpendicular directions, allows for efficient interrogation of RFID tags on items as they move along the conveyor, using multiple antennas to cover a wide sensing zone and shielded panels to block interfering signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic scanning of RFID tags is used, then scanning speed is improved, but scanning accuracy deteriorates due to interference from nearby tags and workers
Solution Approach 1:
The scanning system is divided into multiple independent antenna elements arranged in an array. Each antenna can be independently controlled to scan specific zones, allowing the system to segment the scanning task and reduce interference between adjacent scanners. This segmentation enables simultaneous scanning of multiple items without mutual interference, maintaining both speed and accuracy.
Solution Approach 2:
Different antennas in the array are positioned and oriented to create localized scanning zones with specific electromagnetic field characteristics. Each antenna element provides focused scanning capability in its designated area, reducing the impact of nearby tags and workers on the scanning accuracy of each local zone.
2Measurement precision
If RFID scanning tunnel is used to isolate items, then scanning accuracy is improved, but throughput deteriorates due to large separation distance requirements
Solution Approach 1:
Multiple antenna elements are merged into a single integrated array structure that can simultaneously scan multiple items in parallel. This combining approach eliminates the need for physical separation tunnels while maintaining scanning accuracy through coordinated control of individual antenna elements, thereby significantly increasing throughput.
Solution Approach 2:
The system transitions from a single-dimensional scanning approach (items passing through a tunnel one at a time) to a multi-dimensional scanning approach where multiple antennas operate simultaneously in different spatial zones. This dimensional expansion allows parallel processing of multiple items without requiring large separation distances, thus improving both accuracy and throughput.
3Measurement precision
If manual scanning is used, then scanning accuracy is maintained, but labor intensity and time consumption increase
Solution Approach 1:
The system employs automated RFID scanning technology that operates without human intervention. The antenna array automatically detects, reads, and processes RFID tags as items pass through the scanning zone, eliminating manual scanning operations while maintaining high accuracy and increasing throughput significantly.
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 system enables rapid and accurate identification of items on an overhead conveyor, reducing human error and increasing throughput by moving antennas to align with items and shielding from interference, allowing for simultaneous scanning of multiple items and improved data collection for sorting and tracking.
Implementation Method 1
at least one RFID antenna mounted to the frame in an orientation substantially perpendicular to the transport path, the antenna being capable of interrogating an RFID tag when in proximity to it
Implementation Method 2
shielded panels to block interfering signals
Data Source
AI summary
An in-transit identification system for an overhead conveyor that transports items equipped with radio frequency identification (RFID) tags uses a guide track arrangement and an antenna frame movably connected thereto. An RFID antenna is mounted to the frame and a bidirectional translation mechanism moves the frame relative to the guide track arrangement along a first direction parallel to a transport path of the conveyor and a second direction perpendicular to the first direction. A controller controls the translation mechanism to move the frame along the second direction to locate the antenna in the transport path adjacent to a first item being transported, along the first direction to maintain the antenna adjacent to said first item while an RFID tag of said first item is interrogated by the antenna and again along the second direction to withdraw the antenna from the transport path after interrogation of the RFID tag.