Scraper Conveyor Chain Breakage Detection via Speed Encoder
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Solution Overview
Problem
Existing broken chain detection techniques for scraper conveyers are susceptible to external interferences, have poor reliability, and fail to detect partially broken chains effectively, posing safety risks due to complex operating conditions and outdated detection methods.
Innovation Solution
A broken chain detection system comprising a speed detector with hollow shaft photoelectric increment encoders, a PLC controller, an automatic warning device, and a digital display module, which measures the relative rotation speed difference between speed measuring gears and triggers warnings and shutdowns when a critical threshold is exceeded, ensuring real-time detection and prevention of chain failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional detection methods (hall elements, pressure sensors) are used, then detection coverage is provided, but reliability deteriorates due to susceptibility to external interferences
Solution Approach 1:
The patent replaces traditional mechanical detection methods (hall elements, pressure sensors, travel switches) with a non-contact optical detection system using encoders and photoelectric sensors. This substitution eliminates the reliability issues caused by external interferences such as dust, moisture, and mechanical wear, while maintaining detection capability through optical measurement of chain wheel rotation speed.
Solution Approach 2:
The patent introduces an encoder as an intermediary measurement device that indirectly detects chain integrity by measuring the rotation speed of the chain wheel. Instead of directly detecting chain breakage, the system uses the encoder to measure rotational parameters and infers chain status from speed variations, thereby avoiding direct exposure to harsh environmental conditions.
2Reliability
If motor current detection or hydraulic pressure detection is used, then detection capability is provided, but adaptability deteriorates as these methods cannot detect partially broken chains
Solution Approach 1:
The patent employs dynamic speed measurement using encoders that continuously monitor the rotation speed of the chain wheel. By detecting changes in rotational speed dynamics, the system can identify partial chain breakage where the chain wheel may still rotate but with altered speed characteristics, unlike static current or pressure methods that only detect complete failures.
Solution Approach 2:
The patent monitors changes in rotational speed parameters detected by the encoder to identify chain integrity issues. When the chain is partially broken, the rotation speed of the chain wheel changes in a characteristic pattern that the encoder can detect, enabling the system to distinguish between normal operation and partial chain failure based on parameter variations.
3Ease of operation
If travel switches or contactors are used for detection, then detection function is provided, but reliability deteriorates due to easy damage
Solution Approach 1:
The patent replaces mechanical contact-based detection devices (travel switches, contactors) with a non-contact optical encoder system. This eliminates the reliability problems associated with mechanical wear, contact damage, and maintenance requirements, while preserving the detection function through optical sensing of rotational parameters.
4Reliability
If complex detection systems are implemented, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential measurement function needed for chain detection by using a simple encoder on the chain wheel to measure rotation speed. This avoids the complexity of multiple sensors and processing systems while maintaining high reliability through focused measurement of the critical parameter (rotational speed) that directly indicates chain integrity.
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 system provides reliable, real-time detection of broken chains, preventing safety accidents by offering intuitive visual and auditory warnings and automatic shutdown, thus enhancing operational safety and practicality.
Implementation Method 1
encoders are mounted on speed measuring gears of the speed detector, and are hollow shaft photoelectric increment encoders configured to measure the rotation speeds of the speed measuring gears
Data Source
AI summary
Provided is a breakage detection system and method for a scraper conveyor, wherein a speed measurement device of the detection system and a sprocket assembly of the scraper conveyor are coaxially installed. Encoders are installed on speed measurement gears of the speed measurement device. An output end of the speed measurement device is connected to an input end of a programmable logic controller (PLC). An output end of the PLC is electrically connected to an automatic alarm device and a digital display module. A power supply module is used for supplying power to the whole system.