Overview
Onboard Temporary Support is an essential safety device in underground mining and tunneling operations. It is designed to provide immediate mechanical support to newly excavated roofs or walls, significantly reducing the risk of rock falls during the critical period before permanent support installation. These systems are typically integrated with drilling jumbos or tunneling machines, allowing for quick deployment right after the excavation process. The development of onboard supports has dramatically improved worker safety in high-risk underground environments.
Structure and Working Principle
The system consists of hydraulic cylinders, support arms, and a canopy that contacts the excavation surface. The hydraulic system allows for precise positioning and force application, while the support structure is designed to distribute loads evenly across the excavation surface. When activated, the support extends from the host machine to make firm contact with the roof or walls. The hydraulic system maintains constant pressure to accommodate minor ground movements. Some advanced models feature automatic pressure adjustment and remote operation capabilities.
Key Features
Modern onboard temporary supports offer several important features. They provide rapid deployment, often within seconds of excavation completion, which is crucial for worker safety. The systems are designed for high load-bearing capacity, typically ranging from 5 to 30 tons depending on the model. Many models feature modular designs that allow for customization based on specific project requirements. Advanced systems may include integrated monitoring that provides real-time feedback on support performance and ground conditions.
Application Areas
The primary application of onboard temporary support is in underground coal mining, where it's used in roadway development and longwall panel preparation. These systems are equally valuable in metal/non-metal mining operations and civil engineering tunneling projects. They're particularly useful in geologically challenging conditions where immediate support is critical. Some specialized models are designed for use in shaft sinking operations or in conjunction with roadheaders for tunnel boring applications.
Maintenance and Precautions
Regular maintenance is essential for reliable operation. Hydraulic systems require periodic fluid checks and filter replacements. All mechanical joints and bearings should be lubricated according to the manufacturer's schedule. Operators should conduct visual inspections before each shift, checking for hydraulic leaks, structural damage, or excessive wear. Safety precautions include never working under unsupported ground and ensuring the support is properly engaged before allowing workers into the newly excavated area.
B2B Procurement Guide
When procuring onboard temporary support systems, consider compatibility with your existing equipment fleet. Evaluate the required support capacity based on your typical ground conditions and excavation dimensions. Leading manufacturers often provide customization options for specific applications. For reference, prices typically range from $10,000 to $50,000 depending on capacity and features. Consider total cost of ownership, including maintenance requirements and expected service life, rather than just initial purchase price.
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