Monorail Hoist Brake Shoe Contact Sensing for Accurate Idling Time
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Solution Overview
Problem
Current methods for detecting the idling time of a brake shoe in monorail hoists suffer from large measurement errors, low adaptability, and interference from assembly clearance and brake shoe abrasion, making them inaccurate and unreliable.
Innovation Solution
A device comprising a contact detection unit with a metal probe and a common end roller unit, connected through detection lines, which includes a tube, bevel ring, and resetting spring, allowing for accurate idling time detection during operation by adapting to brake shoe abrasion and minimizing miscontact with the traveling track.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic and static contacts are installed on the brake of the driving part to indirectly measure contact signals, then the idling time can be detected during normal operation, but the assembly clearance between components affects the measurement accuracy
Solution Approach 1:
The invention extracts the detection function from the driving part assembly and relocates it to the brake shoe itself. By installing the contact detection unit directly on the brake shoe, the measurement is taken at the actual contact point, eliminating the influence of assembly clearances in the driving part transmission chain.
Solution Approach 2:
The metal probe acts as an intermediary element that directly contacts the traveling track to detect the contact moment. This intermediary measurement approach bypasses the intermediate transmission components (dynamic and static contacts) that introduce measurement errors due to assembly clearances.
2Ease of manufacture
If tin foil is stuck on the surface of the brake block and track for direct detection, then the detection is simple, but it can only be detected when the monorail hoist is stationary
Solution Approach 1:
The invention transforms the static detection method into a dynamic one by using a metal probe that can detect contact signals during motion. The contact detection unit is designed to function during the braking process, allowing detection while the monorail hoist is in operation, thus achieving both simplicity and operational adaptability.
3Device complexity
If the metal probe is fixed rigidly to detect contact with the traveling track, then the detection structure is simple, but brake shoe abrasion causes measurement errors over time
Solution Approach 1:
The metal probe is designed with dynamic adjustment capability through the resetting spring mechanism. As the brake shoe wears, the probe can adjust its position dynamically to maintain proper contact with the traveling track, ensuring consistent measurement reliability over time while keeping the structure relatively simple.
Solution Approach 2:
The resetting spring enables the metal probe to self-adjust its position automatically as the brake shoe undergoes abrasion. This self-service mechanism compensates for wear without requiring external intervention or complex adjustment systems, maintaining measurement consistency while preserving structural simplicity.
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 provides precise idling time detection with high reliability, sends alarms for abnormal brake conditions, and prompts timely replacement of worn-out brake shoes, enhancing the safety and performance of the monorail hoist braking system.
Implementation Method 1
Another end of the metal probe approximate to the raised cylindrical block is sleeved with a resetting spring. The resetting spring is in contact with a bottom part of the tube and the raised cylindrical block of the metal probe
Implementation Method 2
A frictional coefficient between the bevel ring and the inner wall of the tube is greater than a tangent value for an angle between a bevel of the bevel ring and a horizontal plane
Data Source
AI summary
The disclosure discloses a device for detecting idling time of a brake shoe of a monorail hoist and a detection method thereof. The device includes a contact detection unit, a common end roller unit, an idling time detection unit and detection lines. The contact detection unit installed on a brake of the monorail hoist includes a tube in connection with the brake shoe. The common end roller unit is installed on a frame of the monorail hoist and corresponds to a travelling track. A metal probe corresponding to the travelling track is arranged inside the tube. A limiting bolt corresponding to a raised cylindrical block formed on the metal probe is formed on an inner side wall of the tube. The metal probe is contactable with the travelling track or the limiting bolt when the brake shoe brakes.