Footwear manufacturing machines—Cutting and punching machines—Safety requirements
1Key Takeaways
This standard specifies relevant safety requirements for the design and operation of hydraulic cutting and punching machines (hereinafter referred to as "machines"). This standard applies to hydraulic cutting machines and punching machines used in the manufacture of footwear, leather and artificial leather and other fl…
2Expert Interpretation
Comprehensive analysis of the safety specifications of GB/T 39932-2021 standard for hydraulic cutting machines and punching machines, covering the safety design, hazard protection and inspection requirements of 10 types of equipment. Focus on core safety measures such as cutting surface protection, electro-sensitive protection devices, and two-hand control, and provide noise control and ergonomic design guidelines, suitable for footwear and leather processing equipment manufacturers and safety managers.
Analysis of the core safety requirements of the standard
This standard applies to 10 types of shoemaking equipment, including hydraulic cutting machines and punching machines, with a focus on preventing five major hazards, including mechanical extrusion and electrical injuries. Safety is ensured through a triple protection system:
- Physical isolation protection: The spacing between fixed/movable protective devices must comply with the requirements of GB/T 23821
- Electro-sensitive protection: Type 2/Type 4 photoelectric protection devices cover the hazardous area
- Control protection: Type ⅢA-ⅢC two-hand control devices are mandatory
Safety comparison of key equipment
| Equipment type | Core hazard | Required protective measures | Performance level |
|---|---|---|---|
| Rotary arm cutting machine | T zone extrusion/S zone impact | Two-hand control + 8mm stroke limit | PLc level |
| Beam down pressure type | Vertical extrusion | ⅢC type two-hand control + double valve protection | PLe level |
| Automatic cutting machine | Feeding area entanglement | Interlock protection + emergency stop device | PLd level |
Noise control technical specifications
The standard requires no-load noise ≤85dB(A), through:
- Source noise reduction: dynamic balancing of rotating parts, silencer design of hydraulic circuit
- Transmission control: Anti-vibration pad for machine base (vibration reduction effect ≥ 15dB)
- Management measures: Mandatory marking of noise values and provision of protection suggestions
The test method is strictly implemented in accordance with Appendix F, and 12 parameters such as die material and number of cuttings need to be recorded.
Implementation suggestions
Design phase:
- Perform risk assessment according to EN ISO 12100 standard
- The electrical system meets the IP22 protection of GB/T 5226.1
- The hydraulic pipeline adopts flange connection to prevent bursting
Use phase:
- Check the response time of the electro-sensitive protection device every month (≤200ms)
- Replace the cutting pad immediately if it is worn more than 3mm
- Modification of safety control circuit is prohibited