Elongated planetary screw extruder
1Key Takeaways
This standard specifies the terms and definitions, basic requirements, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage and quality commitment of the extended planetary screw extruder. This standard applies to extended planetary screw extruders (he…
2Expert Interpretation
Professional interpretation of Zhejiang Province T/ZZB 0468-2018 extended planetary screw extruder standard, covering equipment technical parameters, safety specifications, testing methods and quality commitments, suitable for the plastic products processing industry. Detailed analysis of core index requirements such as screw nitriding treatment and barrel hardness.
Analysis of Standard Technical Framework
| Core Indicators | Standard Requirements | Test Methods |
|---|---|---|
| Main Screw Nitriding Depth | ≥0.5mm | GB/T 11354-2005 |
| Surface Hardness | ≥900HV | GB/T 4340.1 |
| Speed Error | ≤2% | Speed Measuring Device Comparison |
Key Technical Requirements
Structural Design Features
The standard clearly defines the extended type as main screw length> 1200mm, using a unique planetary structure of main screw + two-stage driven screw. The stepped design of the driven screw can improve the material mixing efficiency, and after CAE optimization, the energy consumption is reduced by 15-20% compared with the traditional structure.
Material Process Specifications
Key components must use 38CrMoAl grade steel and implement:
- Main screw/barrel: double nitriding treatment
- Driven screw: quenching + nitriding composite process
- Discharge port: electroplating anti-corrosion treatment
Implementation and application suggestions
Equipment selection reference
According to the parameters in Table 1 of the standard, when the Φ350mm model is matched with a 315kW motor, it should be ensured that:
- Specific power ≤0.126kW/(kg/h)
- Specific flow ≥41.667(kg/h)/(r/min)
Maintenance points
It is recommended to check every 500 hours:
- Screw clearance (measured with a feeler gauge)
- Nitride layer wear
- Gearbox oil temperature (temperature rise ≤ 42°C)
Standard evolution analysis
Compared with JB/T 8061-2011, this standard:
- Added special requirements for planetary structures
- Increased the nitride hardness index from 850HV to 900HV
- Cleared the quality commitment clauses unique to Zhejiang manufacturing