Elevator Rope Cleat Tension Adjustment With Spring-Based Calculation
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Solution Overview
Problem
Existing tension adjustment methods for elevators require significant time and effort due to repeated adjustments and checks to ensure the tension of main ropes falls within allowable ranges.
Innovation Solution
A method involving determining adjustment amounts for rope cleat devices based on the difference between pre-adjustment tension values and target tension values, using equivalent spring constants to minimize adjustments, allowing for simultaneous adjustment of multiple ropes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated adjustment and check operations are performed to ensure rope tension falls within allowable range, then tension adjustment reliability is improved, but adjustment time and labor effort increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-calculating the exact adjustment amount needed for each rope cleat device based on detected tension values and spring constants before actual adjustment. This allows the maintenance worker to perform a single adjustment operation rather than repeated adjustments and checks, significantly reducing adjustment time while maintaining reliability.
Solution Approach 2:
The patent uses feedback by detecting the actual tension values of suspension bodies, comparing them with target values, and using this information to calculate precise adjustment amounts. The mobile terminal device receives tension data, computes required adjustments, and guides the maintenance worker to make accurate single-step adjustments, eliminating the need for repeated trial-and-error operations.
2Reliability
If repeated adjustment and check operations are performed to ensure rope tension falls within allowable range, then tension adjustment reliability is improved, but labor effort increases significantly
Solution Approach 1:
The patent applies self-service by enabling the system to automatically detect tension values, calculate required adjustment amounts, and generate adjustment plans without requiring the maintenance worker to perform multiple manual checks and adjustments. The mobile terminal device autonomously processes tension data and provides precise adjustment guidance, making the operation easier and more efficient.
Solution Approach 2:
The feedback mechanism provides the maintenance worker with precise adjustment amounts calculated from actual tension measurements, eliminating the need for repeated manual adjustments and checks. The system guides the worker to make a single correct adjustment, significantly reducing labor effort while ensuring reliability.
3Manufacturing precision
If multiple rope cleat devices are adjusted individually through repeated operations, then each rope tension precision is improved, but overall adjustment productivity decreases
Solution Approach 1:
The patent applies preliminary action by calculating the exact adjustment amount for each rope cleat device in advance based on detected tension values and spring constants. This allows all rope cleat devices to be adjusted in a single operation with precise control over each individual tension value, simultaneously improving precision and productivity.
Solution Approach 2:
The patent applies segmentation by treating each rope cleat device as an independent adjustment target with its own calculated adjustment amount. The system divides the overall adjustment task into individual rope-specific calculations and adjustments, allowing precise control of each rope tension while enabling parallel or sequential execution to improve overall productivity.
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
Reduces the time and effort required for tension adjustment by stabilizing rope tension efficiently, minimizing variations, and preventing excessive wear on suspension bodies.
Implementation Method 1
a rope cleat spring of the first rope cleat device; determined when the first part and the rope cleat spring of the first rope cleat device are regarded as a series spring
Data Source
AI summary
A tension adjustment method for an elevator includes an adjustment-amount determination step of determining a first adjustment amount to be applied to a first rope cleat device. When a part of a suspension body from a first end portion to a driving sheave under a state in which a car and a counterweight are positioned at the same height is defined as a first part, the first adjustment amount is determined from a value proportional to a value obtained by dividing a tension adjustment value being a difference between a pre-adjustment tension value of the suspension body and a target tension value by an equivalent spring constant that is determined when the first part and a rope cleat spring of a first rope cleat device are regarded as a series spring.