GB/T 33930-2017 in English
VALIDHigh-pressure rolling mill for mine--Restore specifications of extrusion roll
- Issued on:2017-07-12
- Implemented on:2018-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 33930-2017矿用高压辊磨机 挤压辊修复规范》由TC88（全国矿山机械标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
National Standard of the People's Republic of China GB/T 33930—2017 Specification for Repair of Extrusion Roller of High-Pressure Roller Mill for Mining
Background and Significance of the Standard
This standard is an industry standard formulated based on the actual needs of the mining machinery industry and combined with advanced technologies at home and abroad. It mainly focuses on the repair of the extrusion roller in the high-pressure roller mill for mining, and stipulates the technical requirements, testing standards and implementation specifications of the two repair methods of surfacing welding and stud nailing.
Comparison of standard frameworks
| Standard dimensions | Repair of welded extrusion rollers | Repair of nailed extrusion rollers | Online repair | Offline repair |
|---|---|---|---|---|
| Repair method | Submerged arc welding or open arc welding | Replace nails or roller sleeves | Repair without disassembling the equipment | Repair after disassembling the equipment |
| Applicable scenarios | Local wear of roller surface | Large area nail failure | Emergency repair needs | Regular maintenance or comprehensive repair |
| Quality inspection | Surface without cracks or pores, hardness ≥58 HRC | Studs installed in place, fracture number ≤0.2% | Operation time reaches more than 50% of the original lifespan | Operation time is the same as the original roller |
Explanation of professional terms
Welded roll: The roll surface in direct contact with the material is only made of welded wear-resistant material. It is suitable for the case of local wear on the roll surface.
Studded roll: The roll surface is inlaid with wear-resistant alloy studs, which are installed by gluing and other methods. It is suitable for the case of large-area wear or stud failure.
On-line repair: Repair work performed without disassembling the equipment, usually used in emergency situations or to reduce downtime.
Off-line repair: Comprehensive repair work performed after disassembling the equipment, suitable for regular maintenance or when the roller sleeve body is severely worn.
Implementation suggestions
- Choose a suitable repair method: Select surfacing, stud or mixed repair methods based on the roller surface wear and equipment operation requirements.
- Strictly control welding materials: Ensure that the surfacing materials meet the requirements of GB/T17493 and JB/T5000.15-2007 standards to avoid the reduction of wear resistance due to material mismatch.
- Strengthen construction safety management: Protective measures should be taken during the online repair process to prevent high temperature and arc from causing harm to operators, and ensure that the environment is not polluted.
- Regular inspection and maintenance: According to the standard requirements, the roller surface should be regularly inspected for flaws and hardness to promptly identify and address potential problems.
Summary and Outlook
The implementation of GB/T 33930-2017 "Specification for Repair of Extrusion Rollers of High-Pressure Roller Mills for Mining" will effectively improve the repair technology level of the mining machinery industry, extend the service life of equipment, and reduce production costs. In the future, as mining machinery develops towards intelligence and efficiency, the standard will also be further improved to meet the application needs of new technologies and new materials.
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