Underground loaders (LHDs), as core equipment in underground mining and tunnel engineering, are subject to a series of stringent national and industry standards in every aspect of their design, manufacturing, inspection, and use.This standards system is the fundamental basis for ensuring the inherent safety of the equipment, guaranteeing operational efficiency, and achieving standardized management, and it runs through the entire life cycle of the equipment.
Mandatory Safety Standards: Building a Lifeline
Safety is the primary prerequisite for underground operations. For different types of underground loading equipment, the state has promulgated a number of mandatory safety standards, forming the most basic safety baseline.
• General Safety Requirements: GB 25518-2010 "Underground Loaders - Safety Requirements" is the core safety standard for wheeled underground loaders. It systematically specifies the mechanical, electrical, and fire hazards that the equipment may face throughout its entire life cycle, and proposes specific safety requirements and measures for protective devices, braking systems, operating devices, and hydraulic systems. For example, the standard requires that the parking braking system must be able to reliably park on a 15% fully loaded slope and a 20% unloaded slope.
• Specific Safety Standards for Different Models: For underground loading machinery using different walking mechanisms, there are corresponding specialized standards. GB 25525-2010 "Safety Requirements for Tracked Loaders in Underground Mining" applies to tracked equipment such as bucket loaders and crab-claw loaders. GB 25524-2010 "Safety Requirements for Rail-Wheel Loaders in Underground Mining" specifies the safety design of rail-wheel loaders. These standards collectively ensure the basic safety performance of various types of underground loading machinery.
Test Methods and Performance Verification Standards: A Scale for Quantifying Performance
Safety requirements alone are not enough; how to scientifically verify whether the equipment meets the standards is crucial. GB/T 4652-2021 "Test Methods for Rock Loaders and Loaders in Underground Mining" provides unified performance testing and inspection methods. This standard specifies the testing conditions, measuring instruments, test items (such as traction performance, braking performance, productivity, reliability, etc.), and data processing methods for the equipment. It provides authoritative evidence for manufacturers' product type approval tests, users' acceptance tests, and third-party testing, ensuring the authenticity and comparability of performance data.
Basic and Component Standards: Detailed Specifications and Interoperability
The standard system also delves into terminology definitions and key component levels, ensuring consistent industry communication and reliable component quality.
• Terminology Unification: GB/T 7679.2-2025 "Mining Machinery Terminology Part 2: Loading Equipment" unifies the terminology and definitions for underground loading equipment and related components, removing obstacles to technical exchange, contract signing, and standard understanding.
• Component Specifications: More detailed technical standards exist for specific important components. For example, the group standard T/QGCML 3928-2024 "Heavy-Duty Engineering Vehicle Wheels for Underground Loaders" specifically specifies the technical requirements, test methods, and inspection rules for heavy-duty engineering vehicle wheels, ensuring the reliability of the running gear from the source.
Related Standards and Inspection Specifications: Integration into a Broader Safety System
The operation of underground loaders is not isolated; it must also comply with broader mechanical safety and mining safety regulations.
• General Mechanical Safety: GB/T 25684.3-2021 "Earthmoving Machinery - Safety - Part 3: Requirements for Loaders" (equivalent to ISO international standards) sets forth general requirements for the safety design of loaders from a broader perspective of earthmoving machinery.
• In-Service Equipment Inspection: For equipment already in use, industry standard AQ 2065-2018 "Safety Inspection Specification for Underground Mining Trucks" provides items, methods, and judgment rules for periodic safety inspections, serving as an important tool for mining enterprises to manage equipment safety.
Conclusion In summary, the implementation standards for underground loaders constitute a multi-layered, comprehensive, and rigorous system. From mandatory safety baselines to scientifically quantified testing methods, and from basic terminology to key component specifications, this set of standards collectively sets red lines for equipment design and manufacturing, provides guidelines for user procurement and acceptance, and constructs a barrier for the safety of operators. A thorough understanding and strict implementation of these standards are the only way to promote the underground loading vehicle industry toward a safer, more efficient, and more standardized development.
