Automatic Resetting Steel Wire Rope Brake for Elevators
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Solution Overview
Problem
Existing steel wire rope brakes in elevators face issues with manual resetting, inadequate braking force, short brake lining life, and power consumption, failing to meet standards for up-direction overspeed and car accidental movement protection.
Innovation Solution
An automatic resetting steel wire rope brake design incorporating a motor lead screw and push block resetting mechanism, electromagnet resetting mechanism, and electromagnetic triggering mechanism, which enables power-loss triggering and automatic resetting, improving braking force and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual resetting mode is adopted, then the brake can be reset after activation, but the resetting process is inconvenient and time-consuming especially in limited operation spaces and higher storeys
Solution Approach 1:
The brake system performs resetting automatically without requiring manual intervention. The control unit receives triggering signals, activates the electromagnet, and completes the resetting sequence autonomously, eliminating the need for operators to physically access and reset the brake in difficult-to-reach locations
Solution Approach 2:
The manual mechanical resetting operation is replaced by an electromagnetic resetting mechanism controlled by an electromagnet. The control system uses electrical signals to actuate the brake release, substituting the need for manual mechanical manipulation with an automated electrical-mechanical system
2Reliability
If power-on triggering mode is used, then the brake can be activated for up-direction overspeed protection, but the control delay is long and larger electric current is required
Solution Approach 1:
The triggering mode is inverted from power-on activation to power-off activation. Instead of requiring power to be applied to trigger the brake, the system is designed so that loss of power or failure to maintain power triggers the braking action, eliminating the need for intermediate control mechanisms and reducing control delay
Solution Approach 2:
The complex intermediate control mechanisms required for power-on triggering are eliminated. The system directly responds to power status changes, extracting away the unnecessary intermediate components that caused control delays and reduced reliability
3Adaptability or versatility
If friction brake lining with small friction coefficient is used, then the brake can be activated, but the brake lining wears quickly and has short life
Solution Approach 1:
The friction coefficient parameter of the brake lining is changed from a small value to a large value. The patent specifies using brake lining material with a friction coefficient not less than 0.3, which significantly improves brake lining life while maintaining effective braking capability
Solution Approach 2:
The brake lining uses a composite material composition designed to provide both high friction coefficient and long service life. The material is formulated as a composite structure that maintains stable friction characteristics under operating conditions, preventing quick wear
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 integrates ascending and descending over-speed protection and car accidental movement protection, reducing time delays, improving control reliability, and extending brake lining life, making the system more stable and efficient.
Implementation Method 1
an electromagnet resetting mechanism and an electromagnetic triggering mechanism
Implementation Method 2
a motor lead screw and push block resetting mechanism
Implementation Method 3
the friction brake lining is small in friction coefficient, quick-wearing and short in life
Data Source
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AI summary
The present invention discloses an automatic resetting steel wire rope brake, which comprises two side plates, a fixed brake plate, a moving brake plate, a motor lead screw and push block resetting mechanism, an electromagnet resetting mechanism and an electromagnetic triggering mechanism, wherein the fixed brake plate and the moving brake plate are arranged in parallel, and an interval is kept between the opposite clamping surfaces of the fixed brake plate and the moving brake plate; two sides of the moving brake plate are respectively and rotatably matched with one end of a link arm, and the moving brake plate can do translational motion towards or away from the fixed brake plate under the drive of the two link arms; the other end of each of the two link arms is rotatably matched with one end of a sliding axle; two ends of the sliding axle are respectively in sliding fit with arc-shaped grooves of the two side plates; a hooking part is formed on a swing-type latch hook, and is used for hooking and locking the sliding axle; the swing end of the swing-type latch hook is triggered by the electromagnetic or mechanical triggering mechanism to enable the swing end to release the sliding axle; the electromagnetic triggering mechanism, the latch hook, the sliding axle and the moving brake plate are promoted to reset by the motor lead screw and push block resetting mechanism through the electromagnet resetting mechanism. According to the automatic resetting steel wire rope brake disclosed by the present invention, elevator ascending and descending over-speed protection and car accidental movement protection can be realized simultaneously.