What oil is used in hydraulic station? Comprehensive analysis of hydraulic oil selection and performance comparison
As the core power source of industrial equipment, the hydraulic station is inseparable from suitable hydraulic oil for its stable operation. Recently, the discussion on the selection of hydraulic oil has become more popular across the Internet, especially the performance comparison of oil products under different working conditions has become the focus. This article will combine the hot technical topics in the past 10 days, systematically analyze the selection criteria of hydraulic oil, and attach structured data for reference.
1. The core function and classification of hydraulic oil
Hydraulic oil not only transmits power, but also undertakes functions such as lubrication, rust prevention, and cooling. According to the composition of base oil, it can be divided into three major categories:
| Type | base oil | Applicable temperature | Typical life |
|---|---|---|---|
| mineral oil | oil refining | -20℃~80℃ | 1000-2000 hours |
| Semi-synthetic oil | Mineral oil + synthetic ester | -30℃~100℃ | 3000-5000 hours |
| Fully synthetic oil | Polyalphaolefin (PAO) | -40℃~120℃ | More than 6000 hours |
2. Performance comparison of hydraulic oils that has been hotly discussed recently
According to the latest discussion data of the Construction Machinery Forum, the performance of hydraulic oils of different viscosity grades differs significantly:
| ISO grade | 40℃ viscosity (cSt) | pour point | flash point | Wear resistance |
|---|---|---|---|---|
| ISO VG 32 | 28.8-35.2 | -30℃ | 200℃ | medium |
| ISO VG 46 | 41.4-50.6 | -24℃ | 220℃ | Excellent |
| ISO VG 68 | 61.2-74.8 | -18℃ | 230℃ | Excellent |
3. Five key factors in hydraulic oil selection
1.Operating temperature range:It is necessary to choose low pour point oil products in northern winter
2.System pressure level:High-pressure systems (>21MPa) need to choose anti-wear type
3.Seal compatibility:Nitrile rubber seal recommended HM type hydraulic oil
4.Environmental requirements:Biodegradable hydraulic oil degradation rate >80%
5.Economical:Mining equipment should use long-lasting oil filter type
4. New Hydraulic Oil Technology Trends in 2024
| Technical direction | Representative products | Advantages | Application scenarios |
|---|---|---|---|
| Nano additives | Hydraulic oil containing molybdenum disulfide | Reduce friction coefficient by 30% | Precision hydraulic system |
| Intelligent monitoring type | Fluorescently labeled oils | Monitor oil quality in real time | Automated production line |
| water based hydraulic fluid | HFAE emulsion | Excellent fire resistance | Metallurgical industry |
5. Maintenance suggestions and common misunderstandings
1.Oil change interval:It is recommended to replace it every year under normal working conditions, and the continuous operation equipment is shortened to 6 months.
2.Mixing risks:Mixing different brands of oil may lead to increased sedimentation
3.Pollution Control:NAS cleanliness level should be maintained within Level 8
4.Viscosity selection:When starting at low temperature, the viscosity should be reduced by 1 level according to the value recommended by the equipment manufacturer.
Summary:The correct selection of hydraulic oil requires comprehensive consideration of equipment parameters, environmental conditions and maintenance costs. As hydraulic technology develops toward high pressure and intelligence, higher requirements are placed on oil performance. It is recommended to regularly check the physical and chemical indicators of oil and establish a complete oil management system.
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