Conveyor Drive Roller Cooling via Lubricant Extraction
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Solution Overview
Problem
Conveyor drive rollers with internal gear assemblies face overheating issues due to heat generated by the gear assembly, leading to premature failure of liquid lubricants and increased maintenance costs, especially as the size of the rollers scales up.
Innovation Solution
A conveyor drive roller design featuring a hollow drum with an internal gear assembly and liquid lubricant flow paths connected to a cooling system, allowing for the circulation of lubricant outside the drum to maintain a temperature below the degradation point of conventional lubricants, thereby preventing overheating and extending component lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the size of the conveyor drive roller is scaled up, then the power and torque capacity is improved, but the heat generation increases causing liquid lubricant degradation
Solution Approach 1:
The patent extracts the lubricant from the sealed internal environment and introduces it to an external cooling system through flow paths in the stationary shafts. This allows the lubricant to be cooled separately from the heat-generating internal components, resolving the contradiction between high power capacity and lubricant temperature control.
Solution Approach 2:
The stationary shafts serve as intermediaries that contain both the rotating roller and the lubricant flow paths. This intermediary structure enables thermal coupling between the internal heat source and external cooling system without requiring direct modification of the roller's rotating components.
2Device complexity
If an internal gear assembly is used, then the space is saved and efficiency is improved, but the heat generation from gear friction increases
Solution Approach 1:
The patent separates the lubricant cooling function from the gear assembly by providing dedicated flow paths through the stationary shafts. This allows the gear assembly to maintain its compact internal configuration while the lubricant is cooled externally, addressing the heat generation issue without compromising space savings.
Solution Approach 2:
The stationary shafts perform multiple functions: supporting the rotating roller, providing structural stability, and serving as conduits for lubricant flow. This multi-functionality enables the compact internal gear assembly to operate with effective cooling without adding external cooling structures.
3Ease of manufacture
If conventional liquid lubricant is used, then the cost is reduced, but the lubricant degrades at higher temperatures
Solution Approach 1:
The patent implements a cooling system that provides feedback control for lubricant temperature. The cooling system activates when temperature rises, maintaining the lubricant within its effective temperature range, thereby extending the lifespan of conventional lubricants without requiring expensive high-temperature synthetic lubricants.
Solution Approach 2:
The patent changes the operating parameters of the lubricant by introducing active cooling to maintain temperature below degradation points. This allows conventional lubricants to operate reliably in high-power applications where they would otherwise degrade, effectively extending their service life and reducing maintenance costs.
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
The cooling system effectively maintains the lubricant temperature within safe limits, reducing the risk of lubricant degradation and component failure, allowing for more compact and efficient conveyor drive rollers with reduced maintenance needs and increased reliability.
Implementation Method 1
Liquid lubricant flow paths are provided to move the liquid lubricant from inside the hollow drum to outside the hollow drum via the first or second stationary shafts, and vice versa. The liquid lubricant flow paths are connectable to a means for cooling the liquid lubricant.
Implementation Method 2
The heat is generated as a function of the current flowing through the electric motor windings. Thus larger electric motors required to provide more powerful conveyor drive rollers typically generate more heat.
Data Source
AI summary
A conveyor drive roller for moving a conveyor medium. The conveyor roller has a hollow drum which is rotatably connected to a first and a second stationary shaft. An internal gear assembly is disposed inside the hollow drum and couples a motor to the hollow drum such that operation of the motor causes rotation of the hollow drum about the first and second stationary shafts. The hollow drum is configured to hold a liquid lubricant in contact with the internal gear assembly. Liquid lubricant flow paths are provided to move the liquid lubricant from inside the hollow drum to outside the hollow drum via the first or second stationary shafts, and vice versa. The liquid lubricant flow paths are configured for connection to a means for cooling the liquid lubricant.