Elevator Hoisting Machine Torque Impulses for Detaching Gripped Safety Gear
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Solution Overview
Problem
Detaching a gripped stuck elevator car or counterweight requires significant force and often necessitates a separate hoisting device, which is not always necessary or efficient.
Innovation Solution
The method involves producing torque impulses with the elevator's hoisting machine using short consecutive current pulses, allowing for increased detaching torque without a separate hoisting device, and utilizing the hoisting machine to apply forces opposite to the gripping direction, with optional remote control activation and monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a separate hoisting device is used to detach a gripped elevator car, then the detaching force is sufficient, but the device complexity and cost increase
Solution Approach 1:
The patent merges the detaching function into the existing hoisting machine by utilizing its motor to produce torque impulses. Instead of adding a separate hoisting device, the system combines the detaching operation with the primary hoisting function, eliminating additional hardware while achieving sufficient detaching force through controlled torque impulse sequences.
Solution Approach 2:
The patent applies periodic torque impulses through the hoisting machine motor to detach the gripped elevator car. By delivering a sequence of controlled torque impulses rather than continuous force, the system accumulates sufficient detaching force over time while keeping the motor operating within its capability limits, avoiding the need for oversized equipment.
2Power
If continuous current is supplied to the hoisting machine for detaching, then the motor heating is high, but the instantaneous torque is limited
Solution Approach 1:
The patent supplies current to the hoisting machine motor in the form of short consecutive pulses rather than continuous current. This periodic current supply pattern allows the motor to deliver high instantaneous torque during each pulse while having sufficient cooling time between pulses, preventing excessive motor heating while maintaining high peak power output for effective detaching.
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
This approach reduces the need for a separate hoisting device, enables efficient detaching of gripped elevator cars and counterweights, and allows for automated and remotely controlled operation, enhancing safety and efficiency in elevator system management.
Implementation Method 1
torque impulses are produced with the hoisting machine of the elevator, for detaching a gripped stuck elevator car and/or a gripped stuck counterweight. When the current supplied to the hoisting machine for producing consecutive torque impulses is formed from essentially short consecutive current pulses
Data Source
AI summary
The invention relates to an elevator system and also to a method for detaching an elevator car (3) and/or a counterweight (4) from a safety gear (5, 14). In the method torque pulses (1OA, 10B, 10C) are produced with the hoisting machine (1) of an elevator, for detaching a gripped stuck elevator car (3) and/or a gripped stuck counterweight (4).