GB4674-2009
Safety code for grinding machines
磨削机械安全规程
GB 4674-2009 is a current mandatory Chinese national standard for Safety code for grinding machines. It appears in the Machinery compliance cluster with a product safety focus and has an implementation date of Dec 1, 2009.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard applies to grinding machines used for manual, motor, or automatic processing with grinding wheels or segments. It is mandatory for all manufacturers and users of specified grinding equipment. The standard explicitly excludes machinery utilizing mounted points, coated abrasives, oilstones, and lapping pastes.
Technical requirements
The standard outlines general design and manufacturing principles, requiring the elimination of hazards through design, the use of safety guards, and operator warnings for residual risks. It specifies critical dimensional and mechanical requirements for grinding wheel spindles, mandating that spindles withstand maximum allowable loads and utilize anti-loosening mechanisms. Requirements for wheel chucks dictate minimum diameter ratios, stiffness, and material strength, ensuring reliable transmission of driving force without deformation. The standard also specifies mechanical performance criteria for spindle nuts, referencing GB/T 6171. A significant portion of the standard details the construction of wheel protective guards. Guards must effectively contain wheel fragments in the event of breakage to protect personnel. It defines maximum opening angles, minimum wall thicknesses, and the necessity of adjustable protective plates depending on the grinding machine type and operating speed. Additionally, the standard sets environmental and operational limits, including maximum noise levels and dust concentration limits. It mandates specific machinery markings, such as maximum permissible wheel speed, spindle rotational speed, and rotation direction.
Testing methods
Compliance verification involves visual and acoustic inspections (tap tests) of grinding wheels before installation to detect cracks. Operational testing evaluates noise levels during idle running, measured according to GB/T 16769, and dust concentration at the operator's breathing zone, measured per JB/T 9878. The standard also requires static balance testing of wheels after chuck installation and trial runs at working speed to ensure safe operation.
FAQs
Is GB 4674-2009 a mandatory standard for grinding machines?
Yes, all technical content within GB 4674-2009 is designated as mandatory. It serves as a comprehensive safety code that replaces the older GB 4674-1984 standard, requiring full compliance for relevant grinding machinery.
What are the main updates in GB 4674-2009 compared to the previous version?
The updated version introduces design and manufacturing requirements for spindle nuts and machinery marking. It also modifies wheel inspection criteria (adding marking checks) and explicitly includes provisions for operator safety training and assessment, which were not emphasized in the 1984 version.
Does GB 4674-2009 apply to machines using mounted points or coated abrasives?
No, the standard specifically excludes machinery using mounted points, coated abrasives, oilstones, and lapping pastes. It applies strictly to machines utilizing grinding wheels or grinding segments.
The summary above provides a high-level overview of GB 4674-2009. 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 4674-2009 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Safety
- CCS
- C68
- ICS
- 25.100.70
- Competent department
- Ministry of Emergency Management
- Technical committee
- Ministry of Emergency Management
Relationships
Replaces:GB 4674-1984