Elevator Brake Triggering Delay for Load-Adaptive Braking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Elevator brakes in emergency situations can apply excessive and abrupt braking, leading to potential injuries and unnecessary stress on elevator components, especially when the car is fully loaded upwardly or lightly loaded downwardly, as existing systems fail to adapt braking force to varying load conditions.
Innovation Solution
A method that uses a switching unit connected to a control unit to set a voltage based on travel parameters, such as load and direction, to delay the triggering of the elevator brake, employing a delay unit with resistances to regulate the braking force, ensuring the brake is triggered in a situation-adapted manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the elevator brake is triggered immediately upon voltage failure to ensure rapid stopping, then the response time is improved, but the braking force becomes excessive and abrupt causing potential injuries and component stress
Solution Approach 1:
The control unit determines travel parameters (load, direction, speed) before the voltage failure occurs and stores this information. When voltage failure happens, the pre-determined parameters are immediately available to calculate the appropriate delayed triggering time, avoiding the need for real-time calculation during the emergency situation.
Solution Approach 2:
The control unit continuously monitors the actual travel parameters of the elevator car (load, direction, speed) and uses this feedback information to dynamically adjust the triggering delay. The switching unit receives control signals based on this feedback, allowing the system to adapt the braking timing to the actual operating conditions.
2Device complexity
If a fixed triggering mechanism is used to ensure simple operation, then the device complexity is reduced, but the system cannot adapt to varying load conditions resulting in inappropriate braking force
Solution Approach 1:
The control unit automatically determines travel parameters and calculates the appropriate triggering delay without requiring manual intervention or complex user input. The system self-adjusts the braking timing based on its own monitoring of elevator conditions, maintaining simplicity while achieving adaptability.
Solution Approach 2:
The triggering mechanism transitions from a fixed, static system to a dynamic one where the triggering time is continuously adjusted based on real-time travel parameters. The switching unit dynamically controls the voltage interruption timing based on the current load, direction, and speed conditions.
3Object-affected harmful factors
If the brake triggering delay is extended to reduce abrupt braking, then the braking force is better controlled, but the stopping time is prolonged potentially compromising safety
Solution Approach 1:
The system changes the temporal parameter of brake triggering based on the elevator's travel parameters. By calculating an optimized delay time that depends on factors like speed, load, and direction, the system adjusts when the brake should trigger relative to the voltage failure moment to balance gentle braking with timely stopping.
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
Regulates the braking force to prevent excessive and abrupt stops, ensuring compliance with safety standards while minimizing the risk of injury and component overload, and can be implemented with low financial outlay in existing elevator installations.
Implementation Method 1
a movable part is held in the starting position by means of an electromagnetic force of at least one coil connected with at least one voltage source
Implementation Method 2
the movable part is moved from the starting position to a braking position by means of a spring force of at least one spring
Implementation Method 3
When the voltage to the coil is switched off, the magnetic field of the coil collapses and a brake unit or a movable part of the elevator brake presses, by virtue of the spring force of the at least one brake spring, against, for example, a brake disc
Data Source
AI summary
A method for triggering an elevator brake in an emergency situation of a vertically movable elevator car in an elevator installation, wherein a movable part of the brake is held in a starting position by an electromagnetic force generated by a coil connected with a voltage source, and for triggering the brake the voltage supplied to the coil is interrupted and the movable part is moved from the starting position to a braking position by a spring force of at least one spring. A voltage is set by a switching unit that is connected with a control unit in dependence on at least one travel parameter of the elevator car determined by the control unit and, in the case of failure of the voltage source, triggering of the elevator brake is delayed by a delay unit in dependence on the set voltage.