Elevator Rope Lubricant with Solid Additives for High-Temperature Friction
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Solution Overview
Problem
Conventional metal ropes in elevators lubricated with paraffin-based lubricants face issues with reduced friction at higher temperatures, leading to safety risks and limited ability to achieve lighter elevator designs due to increased slip, while thin lubricants fail to maintain adequate friction and durability.
Innovation Solution
Using a lubricant with solid additives, comprising at least 10% thickener and 15-80% oil, which provides higher friction and better traction, preventing slip and wear, and maintaining lubrication even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paraffin-based lubricant is used, then the rope is lubricated and protected from rust, but the friction factor decreases at higher temperatures causing slip and safety risks
Solution Approach 1:
The invention changes the chemical composition parameters of the lubricant by replacing paraffin-based lubricants with synthetic lubricants containing specific additives (anti-wear agents, extreme pressure agents, corrosion inhibitors). This parameter change enables the lubricant to maintain stable friction characteristics across a wide temperature range, preventing the friction factor decrease that occurs with paraffin-based lubricants at elevated temperatures.
Solution Approach 2:
The invention uses a composite lubricant formulation combining synthetic base oil with multiple functional additives. This composite material approach creates a lubricant that simultaneously provides rust protection, maintains friction factor, and resists thinning at high temperatures, overcoming the limitations of single-component paraffin-based lubricants.
2Weight of moving object
If lighter elevator structures are used, then manufacturing and installation costs decrease, but friction between ropes and traction sheave decreases limiting further weight reduction
Solution Approach 1:
By changing the lubricant's chemical composition to include friction-enhancing additives and synthetic base oils with optimal viscosity characteristics, the invention increases the friction factor between the rope and traction sheave. This allows the use of lighter elevator structures while maintaining sufficient friction for safe operation, as the improved lubricant compensates for the reduced normal force from lighter weights.
3Ease of manufacture
If thin lubricants are used, then application is simpler, but they fail to maintain adequate friction and durability at operating temperatures
Solution Approach 1:
The invention changes the viscosity parameter of the lubricant by using synthetic base oils with optimized viscosity-temperature characteristics. This enables the lubricant to remain sufficiently thin for easy application and penetration while maintaining adequate viscosity and friction at operating temperatures, unlike conventional thin lubricants that fail to maintain friction under heat.
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 solution enhances friction between elevator ropes and traction sheaves, improving slip control, allowing for more efficient motor utilization, lighter elevator structures, and extended rope lifespan while preventing rust and wear.
Implementation Method 1
the friction between the elevator ropes and the traction sheave will be greater than with elevator ropes that are lubricated according to prior art
Implementation Method 2
Lubrication improves the operation of ropes and reduces the wearing of the ropes
Implementation Method 3
Lubrication also prevents the rusting of ropes
Data Source
AI summary
The object of the invention is a traction sheave elevator and a rope that contains metal as a load-bearing material, such as the suspension rope of an elevator, which rope comprises at least one or more strands laid from metal wires and which rope is lubricated with a lubricant. Another object is the use of the aforementioned lubricant for lubricating the rope. The lubricant comprises at least oil and thickener, which thickener in the lubricant comprises at least 10% or more of the mass of the lubricant.