GB25974.1-2026

Powered support for coal mine—Part 1: General technical specification

煤矿用液压支架第1部分：通用技术条件

GB 25974.1-2026 é uma norma nacional chinesa obrigatória que entrará em vigor: Powered support for coal mine—Part 1: General technical specification. Setor: Máquinas. Foco: Segurança de produtos. Entrada em vigor: 1 de mar. de 2027.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

This standard applies to the research and development, design, production, and testing of powered supports for coal mines (also known as hydraulic supports). It covers general technical specifications for various types of supports, including 2-leg shield powered supports, 4-leg shield powered supports, and chock supports. This standard is mandatory for all manufacturers producing hydraulic supports for the Chinese coal mining industry. It does not apply to standalone hydraulic components like cylinders or valves, which are covered in other parts of the GB 25974 series.

Requisitos técnicos

The standard specifies comprehensive requirements across multiple performance categories to ensure operational safety and reliability. Key areas include general safety requirements such as pedestrian walkways, dust suppression, and anti-slip measures, as well as specific structural features like lifting points and anti-falling devices. Manufacturers must ensure that all structural components can withstand specified loading conditions without permanent deformation or weld cracking. It details performance metrics for sealing performance, support performance, and adaptability, requiring that supports maintain stability under rated working pressures and adapt to various seam angles. The standard also outlines strict criteria for yielding performance, ensuring that the support force does not exceed 110% of the rated working resistance during roof convergence. Material specifications require the use of killed steel suitable for welding, with specific impact toughness requirements at low temperatures (-20°C). Light metals are strictly prohibited on external surfaces to prevent spark hazards in explosive environments. Welding procedures must comply with the GB/T 12467 series standards.

Métodos de ensaio

The standard outlines rigorous testing procedures, including sealing performance tests under sustained pressure, structural strength tests using various loading configurations (e.g., end loading, torsional loading, eccentric loading), and durability tests involving cyclic loading. Testing must be conducted on a complete support or representative structural assemblies using internal or external loading test rigs. Material properties are verified through tensile and Charpy impact tests according to GB/T 228.1 and GB/T 229.

Perguntas frequentes

What products are regulated under GB 25974.1-2026?

It regulates powered supports for coal mines, including 2-leg and 4-leg shield supports, used for roof support in underground coal mining.

Are there any significant updates from the previous GB 25974.1-2010 version?

Yes, the 2026 version introduces new requirements for pressure display, anti-falling devices, and lifting point markings, while removing certain outdated material strength requirements.

Does this standard cover hydraulic valves and cylinders?

No, this part covers general technical conditions for the support structure. Valves and cylinders are regulated under GB 25974.3 and GB 25974.2 respectively.

The summary above provides a high-level overview of GB 25974.1-2026. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 25974.1-2026 today to access all detailed parameters, tables, and testing procedures.

Indicações de aplicabilidade

Tipo: Produto
CCS: D97
ICS: 73.100
Órgão competente: National Mine Safety Administration
Comitê técnico: National Mine Safety Administration

Relações

Substitui:GB 25974.1-2010 (Vigente)