The JFJM series is a typical opposed-type fluidized bed jet mill, compliant with China’s mechanical industry standard JB/T 12838-2016 Fluidized Bed Pneumatic Pulverizer, which sets mandatory limits for equipment noise. Below is the detailed, scenario-specific noise level data and key influencing factors:
Core Standard & Baseline Noise Level
Per the JB/T 12838-2016 standard, the sound power level noise of a qualified fluidized bed jet mill (including JFJM series) during normal operation shall not exceed 80 dB(A). This is the factory-certified baseline for the JFJM mill mainframe under rated operating conditions (0.7–1.0 MPa working pressure, matched air flow).
Noise Level by Equipment Configuration
Actual on-site noise at the operator position (1 meter from the equipment) varies significantly based on noise reduction configurations, as detailed below:
| Configuration Type | Noise Level (1m Operator Position, dB(A)) | Application Scenario |
|---|---|---|
| Standard mainframe (basic configuration, no additional sound insulation, excluding independent air compressor) | 83–85 | General industrial production workshops with loose noise requirements |
| Standard noise reduction package (mainframe sound insulation cover, shock-absorbing base, pipeline muffler, fan silencer) | 75–80 | Regular production workshops, meets the GBZ2.1 occupational health standard (8-hour equivalent sound level ≤85 dB(A)) |
| Custom full sound insulation configuration (fully enclosed sound insulation room, intake/exhaust impedance composite muffler, vibration isolation foundation, soft pipe connections) | ≤75 (lab/small models can reach ≤70) | Clean workshops, laboratories, and production sites with strict noise control requirements |
Key Factors Affecting JFJM Mill Noise
- Equipment Model & Size
- Larger JFJM models (e.g., JFJM400, JFJM600, JFJM800) have higher compressed air consumption, resulting in higher high-frequency airflow noise. Large-scale models have a noise level 3–5 dB(A) higher than small lab-scale models under the same configuration.
- Operating Conditions
- Noise increases with higher working pressure and air flow. Operating at 1.0 MPa will produce 2–4 dB(A) higher noise than operating at 0.7 MPa. Unstable feeding and over-grinding will also increase irregular airflow noise.
- Auxiliary Equipment Noise
- The main noise sources of the complete grinding system are not limited to the JFJM mainframe:
- Matching air compressor: 85–95 dB(A) (the largest single noise source in the system)
- Induced draft fan/pulse dust collector: 80–88 dB(A)Independent sound insulation treatment for these auxiliary equipment is required to achieve the overall system noise target.
- Structural Design Advantages
The JFJM opposed jet mill has an inherent noise reduction advantage over traditional disc-type jet mills: the material does not pass through the Laval nozzles, reducing airflow turbulence and wear-induced additional noise, with a 2–3 dB(A) lower noise level than traditional models of the same scale.
