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Unlock the leading application of "hydraulic support oil" in the coal industry

unlock the leading application of "hydraulic support oil" in the coal industry

China Construction machinery information

coal mine, known as the food of industry. Since the founding of new China 70 years ago, as an important basic industry, the coal industry has provided a source of power for the development of the national economy, while the coal mine technology and equipment have been constantly upgraded. It is reported that at present, China's complete sets of equipment with an annual output of 10million tons of fully mechanized mining equipment, shearers, hydraulic supports and transporters have reached the world's advanced level. The intelligent fully mechanized mining face with an extra large mining height of 8.8 meters has been successfully applied. The degree of mechanization of coal mining and tunneling in China has reached 78.5% and 60.4% respectively. 183 intelligent mining faces have been built, and coal production has changed from manual operation to mechanization, automation, informatization A historic leap in intelligence

at a time when safe, green and intelligent mining and clean, efficient and low-carbon intensive utilization have become the main theme of the development of the coal industry, as the support equipment of the important equipment of the underground comprehensive mining of coal mines, how to reduce the comprehensive maintenance cost, improve efficiency and help the sustainable development of the modern coal industry with a more valuable lubrication solution? Today, we will work together to unlock the leading application of "hydraulic support oil" in the coal industry

Encyclopedia of oil for hydraulic support

underground hydraulic support in coal mine is the support equipment of fully mechanized mining face and an important part of the "three fully mechanized mining machines" equipment, which can reliably and effectively support and control the roof of the working face and form a safe and reliable working space of shearer. Emulsified oil or concentrated liquid for hydraulic support is generally called the "blood" of hydraulic support system. The working processes of hydraulic support such as support, lifting, moving, sliding and overload protection usually need the help of high water content hydraulic fluid prepared by emulsified oil or concentrated liquid to realize energy transmission and conversion. Therefore, emulsified oil or concentrated liquid products should have a high quality level and excellent performance on the whole, so as to provide a strong guarantee for the normal operation of support equipment

emulsion products for hydraulic supports in underground coal mine production are stored and recycled by emulsion oil tank containers. Products usually prepared with on-site water, according to the definition, emulsified oil can be evenly dispersed in water to form "oil in water" emulsion, which is generally composed of mineral oil and water, emulsifier, rust inhibitor, lubricant and other additives; Concentrated liquid, a liquid substance that can be dissolved in water to form a solution type diluent, is generally composed of water, water-soluble rust inhibitor, corrosion inhibitor, lubricant and other additives

what is the executive standard of hydraulic support oil

at present, domestic support fluid products implement the latest coal industry MT standard "emulsified oil, concentrated fluid and high water content hydraulic fluid for hydraulic support", which is applicable to high water content hydraulic fluid for hydraulic support, external injection single injection hydraulic prop, etc. and the emulsified oil and concentrated fluid for preparing this hydraulic fluid. According to the type of high water content hydraulic fluid, it is divided into two categories: emulsified and concentrated fluid, Each type of product is divided into 8 grades according to the maximum hardness of the water quality applicable when used, and the grade codes are 5, 10, 15, 20, 25, 30, 35, 40, etc. the maximum hardness corresponding to each grade is 250 respectively μ g/g、500 μ g/g、750 μ g/g、1000 μ g/g、1250 μ g/g ,1500 μ g/g,1750 μ g/g,2000 μ G/g, etc

the product model is arranged as HFA according to gb/t 7631.2 × ××-×, Where: H refers to hydraulic fluid, FA × Indicates the type of hydraulic fluid with high water content, FAE indicates emulsified oil, Fas indicates concentrated liquid, ×× Indicates the hardness grade of water quality, × Indicates the mass percentage of the concentration used. For example, the Great Wall brand HFAE emulsified oil for hydraulic support produced by Sinopec Lubricating Oil Co., Ltd. HFAE model represents emulsified oil for hydraulic support, which can be applied to water with a maximum hardness of 750 μ G/g, the use concentration is 4% (mass percentage)

what are the characteristics of hydraulic support oil

the hydraulic system of hydraulic support is mainly composed of power oil cylinder, control valve and 7. According to the degree of automation, it is divided into manual fixture, pneumatic fixture, electric fixture and hydraulic fixture pipe fittings. The emulsified oil product of hydraulic support can effectively protect the hydraulic system of the equipment and prolong the service life of the support equipment. It is widely used in underground coal mines and has high performance requirements for emulsified oil products in the coal industry, Its main features are as follows:

1. It has reliable security. Emulsified oil products should not be able to ignite, of course, can not support combustion, to ensure the safety of coal mine production

2. Viscosity temperature property: the viscosity of the loaded product is close to that of water due to the displacement speed of 5mm/min produced by emulsified oil. Reduce the energy consumption in the work, and the better viscosity temperature performance is also conducive to the stability of the working performance of the pump station and various valves

3. Good corrosion resistance is required. Because emulsified oil products contain rust and corrosion inhibitors, good quality products can even overcome salt mine water, reduce corrosion and prolong the service life of equipment

4. Good lubricity and adaptability of sealing materials. Excellent lubricity and compatibility of sealing materials can effectively avoid leakage, thus reducing maintenance and material consumption costs

5, good stability. Because emulsified oil products contain emulsifiers, couplants and antifoaming agents, a stable emulsifying system can produce stable oil in water emulsions, avoid oil-water separation, and are not easy to produce bubbles, with good chemical stability. Ensure the normal operation of the equipment

6. Emulsified oil products are required to be harmless to human body, have no pungent smell, do not stink, and cannot pollute the environment

7. Economy of use: generally, there are nearly 100 hydraulic supports in the fully mechanized mining face, even as many as 150. Because the viscosity of emulsified oil is small, it is easy to leak, and its lubricity is not as good as that of mineral oil. It is required that the emulsion pump and hydraulic valve have better sealing performance and rust prevention performance. Therefore, the use of emulsified oil products with high cost performance ratio can reduce the leakage of emulsified oil and the consumption of liquid, which can reduce the use cost on the whole

what are the performance indicators of the hydraulic support oil

according to the MT standard of coal industry, the oil used for hydraulic support is divided into physical and chemical performance indicators and application performance indicators. The coal industry standard also stipulates the performance indicators of liquid concentrate products for hydraulic supports, such as freeze-thaw resistance, high and low temperature stability, oscillation stability, rust resistance, lubricity and so on

appearance and smell

appearance is observed by irradiating the colorimetric tube containing emulsified oil, which is usually required to be a transparent and homogeneous liquid. The smell passes the olfactory test, and it is required to be non irritating

open flash point and condensation point

open flash point requires that the temperature in case of open fire is not less than 110 ℃ or none (undetectable), mainly to ensure safe production. The freezing point is a conventional index indicating the low-temperature fluidity of emulsified oil, which is required not to be higher than -5 ℃


the 40 ℃ kinematic viscosity of emulsified oil is required to be no more than 100mm2/s. After water dilution, the maximum non seizure load Pb value of four ball method test of diluent shall not be less than 392n

refractometer indication

refractometer indication is to use emulsified oil and artificial hard water with corresponding hardness to prepare the test solution according to the specified concentration, control the temperature of the test solution at (20 ± 2) ℃, and detect its indication with refractometer. The refractometer reading is usually used to judge the concentration value diluted with water

stability test

according to the MT standard of the coal industry, it is divided into room temperature stability (10 ~ 35 ℃, 168 hours), high temperature stability (70 ℃ ± 2 ℃, 168 hours) and oscillation stability

the stability at room temperature and high temperature is mainly that after standing, the liquid level and the volume of precipitates are required, including the anti condensation performance of doors and windows. The amount of JIS A 1514 ⑴ 993 is not more than 0.1%. At the same time, it is required to have no flocs, sediment, stratification, water precipitation and other phenomena. This is to ensure the stable state of emulsified oil, do not block the valve and spool, do not block the filtration system, and prevent the equipment from rusting and wearing the sealing rubber after liquid separation, causing leakage and affecting the normal work of the support

oscillation stability: under the conditions of temperature 10 ~ 35 ℃, amplitude 200 ~ 300mm and frequency 100 ~ 120 times/min, oscillate for 1min and then stand. After the foam disappears, it is required to have no precipitates. It is also a detection method to ensure the stability of emulsified oil

rust prevention and corrosion resistance test

rust prevention test of emulsion oil diluent at the temperature of 10 ~ 35 ℃, cast iron has no rust and colorless change under the condition of 24h. Under the temperature of 70 ℃± 2 ℃ and 24h in the anti-corrosion test, the steel rod is free of corrosion, and the brass rod is colorless and free of corrosion. Mainly evaluate the anti-corrosion and anti rust performance of emulsified oil to reduce corrosion and prolong the service life of the equipment

sealing material compatibility test

the sealing material compatibility test of emulsified oil diluent adopts NBR sheet. Under the condition of temperature 70 ℃± 2 ℃ and 168h, its physical expansion rate is not greater than 6%. It is mainly required that the sealing material of emulsified oil has good compatibility, so as to prevent the sealing damage of hydraulic support and oil leakage

how can the hydraulic support oil be used with better effect

1. The preparation of emulsion diluent is%. If it is found that the concentration change corresponds to the single arm structure, the portal structure should be analyzed and treated in time. The concentration should be detected by refractometer, or by metrology or chemical demulsification

2. If the miscibility and use of emulsified oil are tested every week, the change of water quality must be immediately detected. If abnormal phenomena such as a large amount of emulsified oil separation, soap separation, discoloration, odorization or precipitation due to non emulsification are found, the new oil must be improved immediately, and then the cause must be found out

3. The emulsion tank of the pump station can be equipped with an auxiliary liquid tank with sufficient oil capacity for the storage of a large amount of return liquid and cleaning liquid tank. The compatibility, stability and rust prevention test of emulsified oil shall be carried out, and it can be used only after passing the test

4. Put an end to the random discharge of emulsion, and keep the working environment clean to prevent pollution

5. Emulsified oil of the same brand and factory shall be used. If two grades of emulsified oil are mixed, the compatibility, stability and rust prevention test of emulsified oil shall be carried out, and it can be used only after passing the test

6. The working temperature of emulsified oil cannot be higher than 40 ℃

how to manage the oil for hydraulic support more efficiently

hydraulic support fluid is the power transmission medium in the traditional hydraulic system of underground support. In the process of use, it needs to be prepared into a certain concentration of liquid with on-site water quality for trial use. For the management of stent solution, it is mainly necessary to monitor the concentration of diluent to ensure normal operation. Through years of deep technical cultivation, Sinopec Lubricating Oil Co., Ltd. has a professional R & D team in the field of emulsified oil and concentrate for hydraulic support, an integrated model of production base and professional sales system, excellent product quality and the use and management mode of hydraulic support fluid, which have been widely used in hydraulic support of coal mining enterprises and have a good reputation

1. Preparation and scheme establishment in the early stage of liquid preparation

in the early stage of liquid change, according to the needs of customers, the on-site liquid preparation water (mineral water or treated water quality) can be used to mix the current support liquid in use in coal mines with the support liquid of this recommended specification according to different proportions (3:1, 1:1, 1:3). When the product is normal, stable performance and good compatibility after mixing, the following liquid change scheme can be carried out

the scheme does not use system cleaning agent, which can avoid the risk of incompatibility between cleaning agent and stent fluid, but dirt may remain in the circulating system, causing the replaced stent fluid to be contaminated