Screw Drive Conveying Apparatus With Variable Speed Roller Pairs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional screw-drive conveying apparatuses are limited in varying the drive travel speed of the conveying traveling body, as the spiral pitch of the screw shafts must be an integer fraction, restricting the number of areas with different conveying speeds that can be achieved, especially when dealing with large workpieces like automobile vehicle bodies.
Innovation Solution
The apparatus features two driven roller pairs with different distances between them, engaging with alternate screw shaft rows, allowing the spiral pitch of each row to be set as an integer fraction, enabling multiple areas with distinct conveying speeds by alternating between the first and second screw shaft rows, thereby increasing the number of settable speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two driven front and rear rollers are arranged with a distance corresponding to the length of screw discontinued space between screw shafts, then the conveying traveling body can be continuously driven and travel irrespective of the existence of screw discontinued space, but the spiral pitch of the screw shafts must be an integer fraction at the distance between the two driven front and rear rollers, limiting the number of areas with different conveying speeds
Solution Approach 1:
The invention divides the conveying apparatus into multiple independent driven roller pairs (first driven roller pair and second driven roller pair) with different distances between rollers. Each pair can engage with screw shafts having different spiral pitches, allowing the system to segment the conveying path into areas with different speeds while maintaining continuous driving capability through proper engagement geometry.
Solution Approach 2:
The invention introduces a dimensional distinction by arranging driven roller pairs at different positions along the conveying path, where each pair corresponds to a specific screw shaft row with a particular spiral pitch. This spatial arrangement in the longitudinal dimension enables multiple speed settings without compromising the continuous driving function, as each roller pair maintains proper engagement with its corresponding screw shafts.
2Adaptability or versatility
If the spiral pitch of screw shafts is changed to vary drive travel speed, then different conveying speeds can be achieved, but the spiral pitch must be an integer fraction at the distance between driven rollers, restricting the number of settable speeds
Solution Approach 1:
The system segments the screw shaft arrangement into multiple rows, each associated with a specific driven roller pair. Each screw shaft row can have its spiral pitch independently selected as an integer fraction of the corresponding roller pair distance. This segmentation allows multiple discrete speed settings (first conveying speed and second conveying speed) without requiring the spiral pitch to satisfy a single universal constraint across the entire system.
Solution Approach 2:
The invention applies local quality by allowing different spiral pitch values for different screw shaft rows, where each row's spiral pitch is optimized for its corresponding driven roller pair distance. The first screw shaft row has a spiral pitch that is an integer fraction of the first driven roller pair distance, while the second screw shaft row has a spiral pitch that is an integer fraction of the second driven roller pair distance. This local optimization enables multiple conveying speeds without creating system-wide complexity.
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 configuration allows for a considerable number of areas with different conveying speeds to be established, enabling the apparatus to handle various tasks with workpieces at suitable speeds, enhancing its utility in conveying applications by allowing multiple speed settings within a single conveying path.
Implementation Method 1
a screw shaft row (13) composed of a plurality of screw shafts (22a to 22c) concentrically arranged in a line and interlockingly rotating at a constant speed with respect to each other is provided along a traveling path of a conveying traveling body (1)
Implementation Method 2
two driven front and rear rollers (7a, 7b) engaged with the screw shafts (22a to 22c) are provided to the conveying traveling body (1)
Data Source
AI summary
A screw-drive conveying apparatus has on a conveying traveling body side, a first driven roller pair having a shorter distance between two driven front and rear rollers and a second driven roller pair having a longer distance between two driven front and rear rollers. A first screw shaft row with which the respective driven rollers of the first driven roller pair are engaged and a second screw shaft row with which the respective driven rollers of the second driven roller pair are engaged are provided on a traveling path side. The length of screw discontinued spaces between both screw shaft rows is equal to the distance between the driven rollers of the driven roller pair engaged with the screw shaft row on the upstream side.