Decentralized Shield Control Bus for Longwall Mining
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Solution Overview
Problem
The existing shield control devices for longwall support in mines require extensive and complex cabling for data transmission, which is costly, error-prone, and prone to damage during operation, especially when connecting multiple functional elements like actuating magnets and sensors.
Innovation Solution
A decentralized distribution device with a microprocessor and switching elements is used within each expansion shield, allowing for localized activation of specific functional elements using unique address code words, reducing the need for extensive cabling and enabling prefabricated wiring, with data transmission occurring through a single cable or bus line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive cabling is used to connect shield control device to multiple functional elements, then data transmission reliability is improved, but device complexity and installation difficulty increase
Solution Approach 1:
A bus line is introduced as an intermediary communication medium between the shield control device and multiple functional elements. Instead of establishing separate point-to-point connections, all components communicate through this shared bus, significantly reducing the total number of cables and connection points while maintaining reliable data transmission.
Solution Approach 2:
The control system is segmented into modular components (shield control device, functional elements with microprocessors) that can independently process and identify addressed commands. Each functional element contains a microprocessor with stored identification codes, allowing selective addressing without requiring dedicated physical connections for each component.
2Reliability
If individual cables are laid to each functional element, then connection reliability is improved, but installation time and cost increase
Solution Approach 1:
Multiple individual cable connections are merged into a single bus line that serves all functional elements. This consolidation reduces installation time and complexity while maintaining connection reliability through the use of standardized connectors and address-based identification systems that eliminate wiring errors.
Solution Approach 2:
Functional elements are pre-configured with stored identification codes and microprocessors before installation. This preliminary programming allows the system to be quickly assembled using the bus line configuration without requiring complex on-site wiring calculations or connections, significantly reducing installation time.
3Reliability
If complex cabling is used for data transmission, then signal transmission quality is improved, but susceptibility to damage increases
Solution Approach 1:
The critical data transmission function is extracted from the physical cable layout and implemented through logical addressing and identification codes stored in microprocessors. This extraction reduces the physical complexity and vulnerability of the cabling system while maintaining signal transmission quality through standardized bus protocols.
Solution Approach 2:
The bus line acts as a protected intermediary that consolidates multiple data pathways into a single robust communication channel. This intermediate structure reduces the exposure of individual connection points to mechanical damage while maintaining reliable signal transmission through the shared bus infrastructure.
4Ease of operation
If centralized control is used for all functional elements, then control simplicity is improved, but system adaptability decreases
Solution Approach 1:
The centralized control system is segmented into distributed microprocessors at each functional element, each capable of independent identification and response. This segmentation allows the system to maintain simple centralized command structure while gaining adaptability through localized intelligence and address-based routing of control signals.
Solution Approach 2:
The control system becomes dynamic through the use of stored identification codes that can be programmatically assigned and reconfigured. This allows the system to adapt to different operational requirements by changing software addresses and protocols without requiring physical reconfiguration of the bus line or hardware modifications.
Data Source
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AI summary
The shield control device of a longwall shield for carrying out the longwall functions of the longwall shield in the longwall face working in a mine is associated with a distributing device upstream of a group of functional elements. Each of the functional elements of the longwall shield is associated with an exclusive address code word, on the call of which the internal connection between the shield control device and the functional elements depends. The distributing device is arranged in close proximity to the functional elements. The functional elements are valves or sensors.