Zone-Controlled Conveyor for Irregular Article Spacing
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Solution Overview
Problem
Conventional conveyors face difficulties in maintaining regular intervals between articles of varying sizes and shapes, leading to inefficient sorting and conveyance, especially when articles are conveyed at irregular intervals.
Innovation Solution
A conveyor system with multiple zones, each equipped with a driving motor and article sensors, uses measuring means to detect intervals or time differences between articles and adjusts the motor speed to maintain regular intervals by accelerating or slowing down the motor, ensuring articles are conveyed at predetermined intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional conveyors use fixed-speed operation, then the structure is simple, but articles are conveyed at irregular intervals leading to inefficient sorting
Solution Approach 1:
The conveyor is divided into multiple independent zones, each with its own driving motor and control system. This segmentation allows each zone to independently adjust its speed to regulate article intervals, transforming a single complex control problem into multiple manageable zone-level control tasks.
Solution Approach 2:
The conveyor system transitions from fixed-speed operation to dynamic speed control. Each zone's driving motor can vary its rotational speed based on real-time article detection, enabling the system to adaptively maintain regular article intervals while handling articles of various sizes and shapes.
2Manufacturing precision
If the conveyor slows down the first conveyor to provide regular intervals, then article intervals become regular, but conveying efficiency is lowered
Solution Approach 1:
Speed regulation is applied locally to specific zones rather than the entire conveyor system. Only zones where interval adjustment is needed modify their speed, while other zones maintain optimal conveying speed, thus achieving regular article intervals without compromising overall conveying efficiency.
Solution Approach 2:
The system applies speed control only partially - specifically in zones where article interval regulation is required - rather than slowing down the entire conveyor. This partial action achieves the desired interval regularity while minimizing the impact on overall conveying speed and efficiency.
3Adaptability or versatility
If sensors are located only at the joint between conveyors, then the control system is simple, but it cannot adjust intervals when articles are transferred at irregular intervals
Solution Approach 1:
The sensor system is segmented and distributed across multiple zones rather than concentrated at a single joint location. This distribution enables each zone to independently detect articles and adjust intervals locally, providing comprehensive interval control throughout the conveyor system.
Solution Approach 2:
Article sensors in each zone provide real-time feedback about article presence and spacing. This feedback enables the control system to continuously monitor and adjust article intervals, ensuring regular spacing even when articles are transferred at irregular intervals from upstream sources.
4Speed
If the conveyor maintains high speed for efficiency, then conveying is fast, but articles collide when intervals are irregular
Solution Approach 1:
The conveyor speed is made dynamic rather than fixed. Each zone can adjust its speed in real-time based on article spacing, allowing the system to maintain high speeds when intervals are adequate while slowing down when needed to prevent collisions, thus balancing speed and safety.
Solution Approach 2:
The control system takes preliminary action to prevent collisions by detecting irregular article intervals before they result in collisions. When sensors detect that articles are spaced too closely, the system proactively reduces speed in the affected zone, preventing the harmful collision before it occurs.
Data Source
AI summary
A conveyor, which has an area in its conveyor line and for adjusting intervals between articles, includes (1) a plurality of zones constituting the area and each having at least one driving motor and an article sensor, (2) structure for measuring either an interval between adjacent articles in the conveying direction or a difference of time points when adjacent articles in the conveying direction pass the sensor, and (3) a motor controller for each of the zones and for varying a rotational speed of the driving motor. When the measuring structure measures either the interval or the difference upon reception of signals from the sensor, the motor controller either accelerates or slows down the rotational speed of the driving motor in a zone where the article is placed.