Elevator Anti-lock Braking Arrangement with Hydraulic Pressure Cycling
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Solution Overview
Problem
Conventional elevator braking systems often cause significant jerk during emergency braking, which can be inconvenient or harmful to passengers, and fail to meet safety requirements for high-rise elevators with large cars and heavy counterweights.
Innovation Solution
A braking arrangement incorporating a speed sensor, hydraulic brake, and actuator that initiates an ABS-like braking process by repeatedly increasing and decreasing hydraulic pressure, with a progressively extended repetition time interval to avoid jerk and ensure strong, smooth deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electromagnetic brakes or hydraulic braking systems are used for emergency braking in elevators, then the braking force is strong and the stopping distance is short, but significant jerk is exerted onto the elevator car which may harm passengers
Solution Approach 1:
The patent applies periodic action by repeatedly increasing and decreasing the hydraulic pressure to the brake caliper in cycles. The actuator performs multiple pressure increase-decrease cycles during the braking process, creating a pulsating braking effect that reduces jerk while maintaining stopping effectiveness. The repetition time interval between cycles is progressively extended as the car speed decreases
Solution Approach 2:
The patent implements dynamics by making the repetition time interval variable rather than constant. The control unit progressively extends the repetition time interval between pressure cycles as the elevator car's speed decreases, adapting the braking rhythm to the changing motion state. This dynamic adjustment smooths the braking process and reduces passenger discomfort
2Speed
If strong braking force is applied immediately in emergency situations, then the deceleration is fast and safety is ensured, but passenger comfort is compromised due to sudden jerk
Solution Approach 1:
The patent applies preliminary action by first applying a preliminary braking force to reduce the elevator car's speed to a predetermined value before initiating the full emergency braking process. This preliminary phase prepares the system for the subsequent pressure cycles, ensuring that the car is already decelerating when the periodic pressure cycles begin, thus achieving both fast deceleration and passenger comfort
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 effectively reduces jerk while providing strong braking forces, ensuring safe deceleration of elevator components, even in emergency situations, by gradually increasing the braking action over time, thus addressing the limitations of conventional systems.
Implementation Method 1
The hydraulic brake arrangement (25) is adapted for generating a braking action onto the moving component (3, 5) upon application of a hydraulic pressure
Implementation Method 2
The actuator arrangement (27) is adapted for generating and applying the hydraulic pressure to the hydraulic brake arrangement (25). The control (29) is adapted to, upon receiving the over-speed signal from the speed sensor arrangement (23), initiating and effecting an ABS (anti-lock braking system) braking process by controlling the actuator arrangement (27) to repeatedly increase and decrease the hydraulic pressure to the hydraulic brake arrangement (25)
Data Source
AI summary
A braking arrangement for an elevator arrangement includes a speed sensor arrangement for generating an over-speed signal of a moving component of the elevator arrangement, a hydraulic brake arrangement for generating a braking action of the moving component upon application of a hydraulic pressure and an actuator arrangement for generating and applying the hydraulic pressure to the hydraulic brake arrangement. The braking arrangement includes a control connected to the speed sensor arrangement and in response to the over-speed signal initiating an ABS braking process by controlling the actuator arrangement to repeatedly increase and decrease the hydraulic pressure to the hydraulic brake arrangement with a repetition time interval that is successively extended during the ABS braking process. The braking arrangement enables safe and reliable deceleration of the moving component, such as a car or a counterweight, while avoiding an excessive jerk by smoothly increasing the braking action.