What oil is added to the hydraulic station? Comprehensive analysis of the selection and use of hydraulic oil
As the core power source of industrial equipment, the hydraulic station is inseparable from the stable operation of suitable hydraulic oil. The requirements for hydraulic oil vary from working conditions, equipment type and environmental conditions. This article will combine popular topics and user concerns across the network for the past 10 days, systematically analyze the selection standards of hydraulic oil, and provide structured data for reference.
1. Classification and characteristics of hydraulic oil
According to the international standard ISO 6743-4, hydraulic oil is mainly divided into the following categories:
| type | Codename | Base oil | Applicable temperature | Typical Applications |
|---|---|---|---|---|
| Mineral oil type | HL | Refined mineral oil | -10~90℃ | Ordinary hydraulic system |
| Anti-wear type | HM | Mineral oil + additives | -20~100℃ | High pressure hydraulic system |
| Low temperature type | HV | Synthetic hydrocarbons | -40~120℃ | Cold area machinery and equipment |
| Fireproof type | HFA/HFB | Water-based/water-in-oil | 0~60℃ | High temperature hazardous areas |
2. Selection of hydraulic oil viscosity grade
Viscosity is one of the most important performance indicators of hydraulic oil. The ISO viscosity grade is compared with the applicable temperature:
| ISO Level | 40℃ kinematic viscosity (mm²/s) | Applicable ambient temperature |
|---|---|---|
| VG15 | 13.5-16.5 | -30~10℃ |
| VG22 | 19.8-24.2 | -15~30℃ |
| VG32 | 28.8-35.2 | 0~50℃ |
| VG46 | 41.4-50.6 | 10~70℃ |
| VG68 | 61.2-74.8 | 20~80℃ |
3. Recommended oil for different equipment
Based on the hot topics in the industry forum in the past 10 days, we will sort out the oil use guide for common equipment:
| Equipment Type | Work pressure | Recommended oil products | Oil change cycle |
|---|---|---|---|
| Injection molding machine hydraulic station | 14-21MPa | HM VG46 | 3000 hours |
| Engineering machinery | 25-35MPa | HV VG32 | 2000 hours |
| Metallurgical Equipment | >35MPa | HM VG68 | 1500 hours |
| Ship hydraulics | 7-14MPa | HV VG22 | 1 year |
4. Frequently Asked Questions on Hydraulic Oil Use
1. Does the hydraulic oil need to be replaced immediately if it turns black?
uncertain. Blackening of oil may be due to normal oxidation or additive effects, and it must be tested before deciding on indicators such as acid value and moisture.
2. Can different brands of hydraulic oil be mixed?
In principle, it is not recommended. Different formulas may produce chemical reactions, and compatibility tests should be performed first if they need to be mixed.
3. How to judge the water inlet of hydraulic oil?
The "burst test" can be passed: heat the oil sample to 100°C. If there is a crackling sound, the water content exceeds the standard (>0.1%).
5. New trends in hydraulic oil technology in 2023
According to recent industry exhibition information, hydraulic oil technology presents three major development directions:
1. Increase the application proportion of biodegradable hydraulic oil (ester base oil)
2. Long-life hydraulic oil (oil change cycle up to 8000 hours)
3. Intelligent monitoring system (real-time detection of oil product status)
Correct choice of hydraulic oil can not only ensure the normal operation of the equipment, but also extend the component life and reduce energy consumption. It is recommended that users choose suitable oil products according to the requirements of the equipment instructions and the working environment, and establish a standardized oil detection system.
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