Reasonable selection strategy
(i) Consider the working environment of the hydraulic support
Temperature environment
In high temperature environment, such as deep coal mine underground, the oil temperature is high when the hydraulic support works. At this time, the lubricant with good high temperature stability should be selected, and its antioxidant performance and viscosity stability should be good. For example, choose the lubricant containing high efficient antioxidant and high viscosity index base oil to prevent the lubricant from poor lubrication caused by rapid oxidation and viscosity drop under high temperature.
In low-temperature environments, such as coal mines at high altitudes or in cold regions, lubricants with low pour points and good low-temperature fluidity are required. You can choose synthetic lubricant, which can quickly reach each lubrication part under low temperature to ensure the normal start and operation of the hydraulic support.
Humidity and corrosive environment
For the humidity of the coal mine underground, we should focus on the anti-rust and anti-corrosion performance of the lubricant. Select the lubricant with sufficient amount of efficient rust inhibitor and corrosion inhibitor. At the same time, pay attention to the anti-emulsification performance of the lubricant, because in a humid environment, the lubricant is easy to mix with water to form an emulsion, which affects its lubricating performance. If the lubricant has poor anti-emulsification performance, once the emulsion is formed, it will reduce its lubrication and protection effect, resulting in increased rust and wear of hydraulic support parts.
(II) Matching the working parameters of hydraulic support
Pressure parameters
Hydraulic bracket is subjected to different pressures when working, for high pressure system, the lubricant needs to have enough anti-wear performance and carrying capacity. For example, when the working pressure of the hydraulic support reaches more than 30MPa, the lubricant is required to be able to maintain the integrity of the oil film under high pressure to prevent the metal parts from directly contacting and producing wear. At this point, the content and quality of the antiwear agent in the lubricant becomes particularly important.
Flow and flow rate parameters
Select the appropriate viscosity lubricant according to the flow and flow rate of the hydraulic support hydraulic system. If the flow and flow rate is large, in order to reduce the energy loss, generally choose a lower viscosity lubricant. However, the viscosity can not be too low, otherwise it can not form a thick enough oil film to protect the components. For example, in some hydraulic bracket systems with rapid frame removal, it is necessary to consider the flow rate and lubrication effect, and choose the lubricant with moderate viscosity to ensure the efficient operation of the hydraulic system and good lubrication of the components.
(III) Cost-benefit analysis
Price Comparison
Price comparison of different brands and specifications of hydraulic support lubricants. But not just price as the only criterion for selection, to combine the quality and performance of the lubricant. For example, some lower-priced lubricants may not be able to meet the long-term working requirements of the hydraulic bracket in terms of quality, which will lead to frequent replacement of lubricants and increase maintenance costs and downtime.
Service life and maintenance cost considerations
Selecting a good quality, long-life lubricant can reduce overall maintenance costs. Although the purchase price may be relatively high, in the long run, it can bring better economic benefits due to fewer lubricant changes and lower probability of equipment wear and repair. For example, a good quality hydraulic support lubricant can last more than a year, whereas a lower quality lubricant may need to be replaced every few months, and poor lubrication can lead to damage to hydraulic support components, increasing maintenance costs.
Translated with DeepL.com (free version)
