Positive Drive Conveyor Belt Splicing With Alignment Mold
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Solution Overview
Problem
Conveyor belts with friction drive systems face issues such as slippage, strain, twisting, and misalignment, leading to increased tension requirements and downtime due to complex splicing processes, especially for positively driven belts like ThermoDrive, which are difficult to install using common hot-plate vulcanizers and require expensive, single-purpose splicing machines.
Innovation Solution
A two-stage manufacturing process converts standard thermoplastic flat belts into positively driven, pitch differential belts by attaching polymeric strips with drive teeth, using adhesive or solvent welding, and employing a hot-plate vulcanizer with alignment molds to maintain pitch during splicing, allowing for diverse variations and easy installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If friction drive systems are used to transmit forces from driven drum to belt, then motion is produced to carry product along conveyor, but slippage occurs and immense tension and strain are required leading to twisting and misalignment
Solution Approach 1:
The belt surface is segmented into discrete teeth or protuberances that engage with corresponding features on the drive drum, replacing continuous friction contact with discrete positive engagement points. This segmentation allows reliable power transmission without slippage while reducing the immense tension required by friction systems.
Solution Approach 2:
The friction-based mechanical system is replaced with a positive drive mechanical system where teeth on the belt engage directly with drive drum features. This substitution eliminates slippage by using interlocking mechanical engagement rather than relying on friction coefficients and tension forces.
2Power
If tension is increased to overcome slippage in friction drive systems, then power transmission is maintained, but strain on conveyor increases causing twisting and misalignment
Solution Approach 1:
By segmenting the drive interface into discrete teeth that engage with the drive drum, the system achieves positive power transmission without requiring immense continuous tension. The segmented engagement distributes forces across multiple contact points, reducing overall strain on the conveyor frame and eliminating twisting and misalignment issues.
Solution Approach 2:
Replacing the friction-based mechanical system with a positive drive system using engaged teeth eliminates the need for high tension to prevent slippage. The direct mechanical engagement transmits power efficiently without imposing excessive strain on the conveyor frame, preventing twisting and misalignment.
3Reliability
If ThermoDrive conveyor belt with drive lugs is used to eliminate tension, then power transmission is achieved, but expensive single-purpose splicing machines are required and installation is difficult
Solution Approach 1:
The belt design incorporates universal features that allow it to be spliced using standard hot-plate vulcanization equipment already present in most facilities, rather than requiring dedicated single-purpose splicing machines. The drive lugs and belt body are designed to accommodate conventional splicing methods, making the system multi-functional and easier to manufacture and install.
Solution Approach 2:
Standard hot-plate vulcanization equipment serves as an intermediary tool that can splice ThermoDrive belts without requiring specialized single-purpose splicing machines. This intermediary approach allows existing infrastructure to be utilized, reducing costs and simplifying installation while maintaining the tension elimination benefits of the drive lug design.
4Adaptability or versatility
If modular belting with interlocking pins is used to create flexible rigid belting, then positive drive is achieved, but discontinuities create contamination risks
Solution Approach 1:
The invention merges the advantages of rigid modular belting with continuous belt construction by integrating drive teeth directly into a continuous belt body. This merging eliminates the discontinuities and interlocking pins of modular systems, maintaining positive drive capability and belt flexibility while removing contamination risks associated with pin and module interfaces.
Solution Approach 2:
The belt uses composite construction combining drive teeth features with the continuous belt body material, creating a unified structure that provides both positive drive engagement and continuous surface. This composite approach maintains adaptability and flexibility while eliminating the discontinuities that create contamination risks in modular systems.
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
Enables cost-effective production of thousands of conveyor belt variations with reduced downtime and equipment costs, ensuring seamless splicing and maintaining drive tooth alignment, while avoiding contamination risks from modular belting discontinuities.
Implementation Method 1
The two ends of the conveyor belt are then spliced together using a hot-plate vulcanizer to form an endless conveyor belt
Implementation Method 2
The strip and/or drive bars can also be made by additive manufacturing, such as 3D printing, for example
Implementation Method 3
A two-stage manufacturing process converts standard thermoplastic flat belts into positively driven, pitch differential belts by attaching polymeric strips with drive teeth, using adhesive or solvent welding
Data Source
AI summary
A manufacturing process converts a standard flat belt conveyor belt into a new, positively driven, pitch differential belt. A strip of thermoplastic material having a physical characteristic, such as melting temperature, that differs from the physical characteristic of the thermoplastic material comprising the conveyor belt, is applied to the drive side of a commercially available conveyor belt and machined to create a plurality of teeth, or drive bars, of any desired geometry that is configured to engage with the with sprockets or drums of the drive mechanism on the conveyor. The strip and/or drive bars can also be made by additive manufacturing, such as by 3D printing. Two ends of the resulting belt segment are cut to length and spliced, preferably with finger joints, to make a continuous loop using an industry standard hot-plate vulcanizer with a custom fitting called an alignment mold. The melting temperature of the belt and the strip/teeth are chosen to be far enough apart so that the belt may be spliced without melting the teeth. The alignment mold is a silicon pad that has recesses shaped to conform to the geometry/pitch of teeth so that the teeth retain their integrity and shape during the splicing process.