High-Speed Flexible Belt Conveying via Synchronized Roller Pairs
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Solution Overview
Problem
Conveying fragile, low-tension flexible strips or sheets at high speeds results in lateral displacement, premature degradation, and misalignment during unwinding and winding, leading to aesthetic and stability issues, as well as premature wear of motorized rollers due to excessive speed and low tension constraints.
Innovation Solution
A method using pairs of motorized rollers rotating at identical speeds, with one roller driving one side of the strip and the opposite roller driving the other side in reverse, maintaining synchronization with the strip's speed to prevent slippage and lateral movement, while adjusting the angle and length between rollers to manage stress and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the strip or web is conveyed at high speeds above 600 m/min, then productivity is improved, but lateral displacement and misalignment occur causing the reel sides to be non-aligned
Solution Approach 1:
The conveying system is divided into multiple pairs of rollers (at least three pairs) arranged in sequence. Each pair independently controls a section of the strip, allowing segmented control of lateral position and tension throughout the conveying path, thereby maintaining alignment at high speeds.
Solution Approach 2:
The system adjusts operational parameters including the speed differential between upper and lower rollers in each pair, the angle of the strip between rollers (50°-80°), and the length of strip between rollers (0.2 to 2 times roller diameter). These parameter changes enable precise control of lateral position and tension to prevent misalignment during high-speed conveying.
2Productivity
If motorized rollers rotate faster than the web speed to ensure conveying, then productivity is improved, but the web slips on the rollers causing premature wear
Solution Approach 1:
The system dynamically adjusts the rotational speed of each roller pair based on real-time conditions. The lower roller rotates slightly faster than the strip speed to prevent slipping, while the upper roller rotates at matching speed. This dynamic speed control eliminates continuous slippage and reduces wear on the rollers during high-speed operation.
Solution Approach 2:
The alternating pattern of upper and lower rollers creating periodic grip and release cycles allows the strip to be progressively advanced without continuous slippage. Each roller pair creates a periodic interlocking action that moves the strip forward in controlled increments, reducing cumulative wear.
3Manufacturing precision
If the strip is constrained to prevent lateral movement, then manufacturing precision is improved, but the longitudinal edges of the strip suffer premature wear
Solution Approach 1:
The system applies counteracting forces through the upper and lower roller pairs. The lower roller applies a gripping force that prevents lateral slipping, while the upper roller provides a counterbalancing force. This counterweight approach stabilizes the strip without requiring harsh edge constraints, reducing wear on the longitudinal edges.
4Manufacturing precision
If tension is applied to keep the alignment of the strip, then manufacturing precision is improved, but the strip tears due to low tension capacity
Solution Approach 1:
Instead of applying tension along the longitudinal axis (one dimension), the system controls alignment by adjusting the angle and position of roller pairs in the transverse dimension. The strip passes between rollers at angles of 50°-80°, allowing lateral alignment control without imposing tensile loads that would exceed the strip's low tension capacity.
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 approach ensures the strip is conveyed without lateral displacement, maintaining alignment and reducing roller wear, allowing for efficient high-speed unwinding and winding with correctly aligned reels and extended roller lifespan.
Implementation Method 1
the web slips on the rollers... in order to ensure this conveying, they rotate at a speed faster than the web's forward speed
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for conveying a low-tension flexible belt or strip (2), made of fabric or composite material, over a length of more than 30 m and at a speed higher than 600 m/min. The method consists of unwinding and returning the belt or strip (2) by means of a plurality of pairs of rollers (4, 5) which are motorised and rotated at identical speeds, each pair of rollers (4, 5) consecutively driving a first surface (2a) of the belt or strip (2) by means of a first roller (4) rotated in one direction and a second opposite surface (2b) of the belt or strip (2) by means of a second roller (5) rotated in an opposite direction.