Guide Wheel Biasing for Transport Vehicle Vibration Reduction

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Solution Overview

Problem

In article transport facilities, the transport vehicle experiences vibration and reduced travel speed at branch junction sections due to delayed timing in shifting the guide roller, leading to large impact contact with the guide rail, which decreases efficiency.

Innovation Solution

The implementation of a control system that executes preliminary biasing processing to move the guide wheel from a first position to a second position before entering the switching area in the branch junction section, allowing smooth transition without reducing travel speed and minimizing vibration by biasing the guide wheel before entering the switching area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the timing of shifting the travel unit is delayed, then the guide roller can be positioned accurately, but the transport vehicle vibrates due to large impact contact with the guide rail

Engineering Contradiction:
Improvepositioning accuracy of guide rollerVSAvoidvibration of transport vehicle
Core Design Contradiction:
Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The guide roller is shifted to the fourth position before the transport vehicle enters the branch junction section, in advance of the actual branching point. This preliminary positioning ensures the guide roller is already in the correct position when needed, eliminating delays and preventing impact contact with the guide rail, thus resolving the contradiction between positioning accuracy and vibration prevention

Inventive Principle:
Principle #10Preliminary action

2Manufacturing precision

If the travel speed is reduced to prevent delay in shifting the travel unit, then the guide roller can be positioned correctly, but the article transport efficiency decreases

Engineering Contradiction:
Improvepositioning accuracy of guide rollerVSAvoidarticle transport efficiency
Core Design Contradiction:
Manufacturing precisionVSProductivity

Solution Approach 1:

The guide roller is shifted to the fourth position in advance, before the transport vehicle enters the branch junction section. This preliminary action eliminates the need to slow down during the branching operation, allowing the transport vehicle to maintain its travel speed while still achieving accurate guide roller positioning, thus resolving the contradiction between positioning accuracy and transport efficiency

Inventive Principle:
Principle #10Preliminary action

3Device complexity

If the guide roller is shifted late, then the structure can be simple, but the transport vehicle experiences large impact and vibration

Engineering Contradiction:
Improvecontrol mechanism complexityVSAvoidimpact contact with guide rail
Core Design Contradiction:
Device complexityVSObject-affected harmful factors

Solution Approach 1:

The control system monitors the position of the transport vehicle and automatically shifts the guide roller to the fourth position based on detected position information. This feedback mechanism ensures timely and accurate positioning without requiring complex manual control, resolving the contradiction between simple structure and vibration prevention

Inventive Principle:
Principle #23Feedback

Data Source

PatentUS20230193565A1Article Transport Facility
Publication Date: 2023.06.22 DAIFUKU CO LTD
  • US20230193565A1 patent drawing
  • US20230193565A1 patent drawing
  • US20230193565A1 patent drawing

AI summary

A control system executes preliminary biasing processing including controlling a guide wheel drive unit to bias a guide wheel in a direction from a first position toward a second position while the guide wheel is at the first position and is in contact with a first-side surface of a branch guide portion from a first side in a width direction before entering a switching area, and allows the guide wheel to pass through the switching area while executing the preliminary biasing processing.