Spring Biased Roller Conveyor Belt Tensioning
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Solution Overview
Problem
Powered roller conveyors often require complex and costly pneumatic, hydraulic, or fluid power sources for assembly, maintenance, and tension management, which complicates setup, disassembly, and adjustment for belt stretch and varying belt lengths.
Innovation Solution
A roller transport conveyor system utilizing a spring-biased carriage assembly for frictional engagement and disengagement of the drive belt with rollers, combined with a gravity take-up mechanism that maintains constant tension without electrical or pneumatic power, allowing for adjustable tension compensation and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pneumatic, hydraulic, or fluid power sources are used for tension management, then belt tension control is improved, but device complexity and cost increase
Solution Approach 1:
The patent removes complex fluid power systems (pneumatic, hydraulic) and replaces them with a simple spring-based tensioning mechanism. The spring element directly provides the necessary tension force without requiring external fluid power sources, thereby eliminating the complexity associated with pumps, valves, and control systems while maintaining reliable belt tension control.
Solution Approach 2:
The spring-based take-up device is self-regulating and automatically maintains belt tension without requiring external power sources or complex control systems. The spring inherently provides the necessary force to compensate for belt stretch and maintains constant tension throughout operation, making the system self-sufficient.
2Reliability
If fluid power sources are used for assembly and maintenance, then operational reliability is improved, but ease of manufacture and maintenance deteriorates
Solution Approach 1:
The patent eliminates fluid power components (pneumatic cylinders, hydraulic actuators) from the assembly and maintenance processes. Instead, simple mechanical operations such as manual spring adjustment and belt replacement are sufficient, greatly simplifying both manufacturing and maintenance activities while maintaining operational reliability.
Solution Approach 2:
The patent replaces complex fluid power mechanical systems with simpler spring-based mechanical tensioning. This substitution eliminates the need for fluid power infrastructure during assembly and maintenance, making the conveyor easier to manufacture, assemble, and maintain while preserving operational reliability through the spring's inherent tensioning capability.
3Device complexity
If fixed tension systems are used, then device complexity is reduced, but adaptability to belt stretch and varying lengths deteriorates
Solution Approach 1:
The spring-based take-up device is inherently dynamic and adjustable. The spring can be compressed or extended to accommodate different belt lengths and degrees of stretch. This dynamic adjustment capability allows the system to adapt to varying operational conditions and belt wear patterns while maintaining relatively simple construction compared to fixed tension systems with multiple adjustment mechanisms.
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 simple assembly, disassembly, and maintenance of the conveyor without fluid power sources, while maintaining consistent belt tension to accommodate belt stretch and varying lengths, reducing operational complexity and costs.
Implementation Method 1
a spring, and a retraction device, is operable to bias the drive belt upwardly to engage the rollers
Implementation Method 2
A drive belt is biased into frictional engagement with the rollers for driving the rollers
Implementation Method 3
A gravity take-up is provided for a transport conveyor. The gravity take-up includes a mass, a cable, a bracket assembly, at least one sheave, and a pulley
Data Source
AI summary
A roller transport conveyor and method provides a device for conveying items along a plurality of rollers, in which the device may be set up and operated and serviced by manually raising and lowering one or more contact members that transmit force from a spring to urge a drive belt into contact with an underside of the rollers. The contact member is adjustable by raising and lowering the contact member to expand and contract the spring, or by raising and lowering a base on which the spring is supported, so that the drive belt may be engaged with and disengaged from the rollers. A gravity take-up includes a mass suspended from a cable that is routed to a pulley having the drive belt reeved thereon. The cable is wound upon a winch that compensates for belt stretch, or for belts of various lengths.