How to distinguish the quality of lubricating oil? How to distinguish between good and bad grease

In the process of bearing use on mechanical equipment, if you want to give full play to your performance, you can't do without the maintenance and protection of bearing lubricating oil. Bearing lubricating oil can play a role in lubrication, cooling, compression, and prolonging bearing life. Bearing lubricants are used in a wide range, including high and low temperatures, high loads, high and low torques, etc.

There are many different types of bearing lubricants. In general, the type of lubricant is different depending on the product being applied. For example, there are oil-impregnated bearing lubricating oil, high-temperature lubricating oil, high-speed main bearing lubricating oil, etc.

1. Identification of lubricating performance:

Rub the thumb and index finger stained with lubricating oil against each other, if there is a sticky feeling, it means that the oil has good lubricating properties, if it feels astringent, it means that the lubricating properties have deteriorated.

2. Inspection of mechanical impurities

The lubricating oil is diluted and filtered with gasoline to observe the filtered impurities.

3. Moisture inspection

1) Inject the lubricating oil into the test tube, observe the transparency, if it is not clear and turbid, it can be preliminarily determined that the lubricating oil contains water;

2) Inject about half of the lubricating oil into the test tube, heat it to about 100 120, if there is a sound, and there are bubbles or water droplets condensed on the tube wall, it means that there is water;

3) Put crystal-free water.

of white powdered copper sulfate.

Put it in a test tube with lubricating oil, if the copper sulfate turns blue and settles at the bottom, it means that the lubricating oil contains water.

4. Particle size inspection

1) On a piece of horizontal clean glass, drop a drop of lubricating oil to be checked and standard quality lubricating oil respectively, and then tilt the glass sheet to compare the speed and distance of the two lubricating oils.

2) the lubricating oil to be checked and the standard quality lubricating oil are respectively packed in two test tubes, the oil level is below the test tube mouth 5, the test tube mouth is sealed, the two test tubes are inverted at the same time, and the speed of bubble rise is observed, if the tested lubricating oil is faster than the standard lubricating oil bubble rising speed, the viscosity of the oil is lower than the viscosity of the standard oil, and vice versa.

5. Oil flow observation method.

Take two measuring cups, one of which holds the lubricating oil to be checked, and the other is empty on the tabletop, hold the measuring cup full of lubricating oil 30 40 cm away from the table top and tilt it, let the lubricating oil flow slowly into the empty cup, and observe its flow. The lubricating oil flow is slender, uniform and continuous; If the flow rate fluctuates fast and slow, and sometimes a large piece of water flows, it means that the lubricating oil has deteriorated.

6. Hand twisting method: twist the lubricating oil between the thumb and index finger and grind repeatedly, the better lubricating oil has lubrication, less grinding debris and no friction; If you feel a large friction sensation such as sand between your fingers, it means that there are many impurities in the lubricating oil and can no longer be used, and the lubricating oil should be replaced with a new one.

The lubricating oil is not very clear, but Shandong Weifang grease manufacturers use the following methods to identify the quality of grease:

Take 20 50g of grease, find a bucket, put the grease into the water, if it floats and does not sink to the bottom, it means that the grease does not add glass powder, etc.

HP grease dropping point: use wire or screwdriver, take a little grease, ignite with fire, if the grease drips down, the grease dropping point is low, otherwise the dropping point is high. Also, after combustion, look at the amount of residue to see the quality of the grease.

Lithium-based grease can't be lit with fire, because the dropping point of the national standard lithium grease is about 180 degrees, so it melts before it is ignited.

What is Lubrication? What is the role of lubricating oil? Lubrication:

It is to add lubricant between the two contact surfaces of relative motion, so that a lubricating film is formed between the two friction surfaces, the direct contact surface is separated, and the dry friction is the internal friction between the lubricant molecules, so as to reduce friction, reduce wear and extend the service life of mechanical equipment, which is called lubrication. The functions of the lubricating oil are: 1 Reduce friction

Adding lubricant to the friction surface can reduce the friction coefficient, thereby reducing the friction resistance and saving energy consumption. 2. Reduce wear: The lubricant can reduce the wear caused by abrasive wear, surface fatigue, adhesive wear, etc. between the friction surfaces.

3. Cooling effect: The lubricant can absorb heat, transfer heat and dissipate heat, so as to reduce the temperature rise caused by friction heat. 4 Anti-rust effect:

The presence of lubricant on the friction surface can prevent rust caused by air, water droplets, water vapor, corrosive gases and liquids, dust, and oxides. 5 Transmitting power: In many cases, lubricants have the function of transmitting power, such as hydraulic transmission, etc.

6. Sealing function: The lubricant seals some exposed parts and parts, which can prevent the insention of moisture impurities. 7 Shock absorption:

When subjected to shock loads, it can absorb impact energy, such as automobile shock absorbers. 8. Cleaning effect: impurities can be taken away through the circulation of lubricating oil and filtered out by the filter.

If you can achieve the above eight points, it is a good lubricating oil.

First of all, look at whether the base oil is mineral or synthetic, the general synthetic one has much better performance than minerals, and then additives; Only then do you know if it's good to use it, and having performance is the best proof!

To distinguish the quality of lubricating oil, it is necessary to do [on] experiments to do, flash point, concentration [sea] and other data are very important, and to see whether your lubricating oil is used for car [brocade] or industrial [Hui], relying on meat [moist] eyes can not be seen [slippery] only do experiments to see [oil] data.

Different lubricants have different standards for distinguishing good from bad, because their requirements are different! You can start by narrowing it down to gear oils, hydraulic oils, automotive oils, and so on.

1. Appearance. No matter what color the grease looks like, the fat body should be a uniform thick paste, if you open the package and see that there is oil slick on the surface, the color of the grease surface is different or the epidermis is hardened, or the consistency is significantly smaller, or the grease surface is mixed with water and emulsified and white, or the grease surface is not sealed and causes qualitative change, these greases are not available.

2. Smell. When the package is opened, there is a clear rancid smell of oil, and the fat body has deteriorated and is unusable.

3. Hand pinching. Generally, the fat without filler has a smooth and sticky feeling when pinched by hand, and there is no clucking phenomenon, if the thickener is uneven or there are impurities, it will be obvious and unsmooth.

4. Date. Generally, the shelf life of the fat should be selected within one year, and the fat of more than one year should be used only after passing the inspection.

5. Burn with fire. Good fat will not make a sound when burning, there is no particularly unpleasant smell, and there will be no thick black smoke.

6. Exposure to sunlight. Take a piece and put it in a cup to dry for a day or two, if the fat changes greatly, the oil is divided or the color changes, its performance is unstable and unusable.

7. Water addition method. Take a small amount of grease and add water to drop on it, stir it with a stick, if it is cloudy and white, it has poor water resistance.

Proper use of grease

1) The amount of lubrication to be injected should be appropriate.

However, depending on the situation, cavity lubrication may be carried out by grease on the edge of the bearing.

2) Pay attention to prevent the mixing of different types, grades and new and old greases.

Avoid cross-use of grease containers and tools, otherwise it will have adverse effects on the grease such as drop point dropping, increased taper penetration and decreased mechanical stability.

3) Pay attention to the work of replacing new grease.

Due to the continuous improvement and change of grease varieties and quality, when the old equipment is changed to new grease, it should be tested first and tried before it can be officially used; When replacing the grease, the waste grease should be removed and the parts should be cleaned. When refilling the grease, the waste grease should be squeezed out until new grease is seen at the grease discharge port.

4) Pay attention to the management of the grease filling process.

Before receiving and filling grease, strict attention should be paid to the cleaning of containers and tools, and the grease supply port on the equipment should be wiped clean in advance to prevent the mixing of mechanical impurities, dust and sand particles.

5) Pay attention to the timely replacement of seasonal grease.

If the temperature difference between winter and summer and the temperature of the environment where the equipment is located varies greatly, if the winter grease is used in summer or vice versa, the result will be counterproductive.

6) Pay attention to regular grease change.

The grease replacement time should be determined according to the specific use case, which should ensure reliable lubrication without causing waste of grease.

7) Do not pack grease in wooden or paper containers.

Prevent oil loss from hardening, moisture or contamination, and should be stored in a cool, dry place.

Grease is different from lubricating oil.

1) Appearance: No matter what color the grease presents, the fat body should be a uniform viscous paste. If you open the package and see oil slicks on the surface, different shades of the grease surface or hardening of the epidermis, or the consistency is significantly smaller, or the grease surface is mixed with water and emulsified and white, etc., these may be qualitative changes caused by storage for too long, or the packaging is not sealed and caused by qualitative changes, and these fats are not available.

2) Smell: When opening the package, there is an obvious rancid smell of grease, and the fat body has deteriorated, so it is not available.

3) Hand pinching: Generally, the fat without filler has a smooth and sticky feeling when touched by hand, but there is no giggling phenomenon, if the thickener is unevenly dispersed or has impurities, it obviously has a gruffling feel and is not slippery, these fats are not available, and the fat containing filler powder may have a gruff feeling, which is not classified as such.

4) Look at the production date of the package: Generally, the grease with a shelf life of less than one year should be selected, and the grease with a shelf life of more than one year should be tested for quality before it can be used.

6) Sun exposure: Take a piece of fat and put it in a cup to dry for a day or two, if the fat body changes greatly, oil or color change, its performance is unstable and unusable.

Hello answer, I have provided you with three methods, first, put it in clear water to see if it floats, and if it floats up, it is good to float; Second, put it in clean water and stir it to see if it is soluble in water, and the one that is insoluble in water is good; Third, light it with fire to see if it can be ignited, and if it can't be ignited, it is not good. That's how I do it for you, I hope my answer is helpful to you, give it a thumbs up

It is difficult to distinguish the quality of grease by its appearance, and there are only two ways: (1) laboratory parameters; (2) Practical application.

If these two items are difficult to do, it is recommended to buy products from more professional manufacturers, such as Hotolube, Great Wall, Kunlun, Uni-President, etc., and foreign ones such as Kluber, Fox, Dow Corning, Synergy, etc.

The first step is to look at the production date.

In general, the storage time of grease should not be too long, the user should choose the grease with a shelf life of no more than one year, and the grease with a shelf life of more than one year should be used only after passing the inspection.

The second step is to look at the appearance.

Different types of grease come in different colors, but no matter what color the grease is, it should be a viscous and uniform paste. If the grease is of different shades of color or the epidermis is hardened, there is more oil slick on the surface of the grease or the consistency is significantly smaller, or the surface of the grease emulsifies and turns white due to the mixing of water, these phenomena indicate that the grease has deteriorated and cannot be used.

Step 3: Smell the smell.

If you smell a distinct stench of grease acid when you open the package, the grease has deteriorated and cannot be used.

Step 4: Hand twisting.

When twisting the grease without filler by hand, it feels smooth and has no awkward feel; Otherwise, it may be that the thickener is unevenly dispersed or mixed with impurities, and the lipid should not be used. However, grease with filler powder is slightly awkward.

Step 5: Burn with fire

Pick up a piece of grease with iron wire, and then burn it with a lighter, if the grease softens and drips, it indicates that the dropping point is too low quality grease and should not be used. It should be noted that this method can only identify inferior grease with a low dropping point, because the temperature of the lighter flame does not exceed 120 130, and the dropping point of most grease exceeds this temperature, and it will not drip when burned with a lighter.

Step 6, in the sun: take a piece of grease and put it in the cup in the sun for a day or two, if the fat body changes greatly, there is oil separation or discoloration, indicating that the performance of the grease is unstable and can not be used.

Step 7, water method: take a small amount of grease and put it in the cup, add a few drops of water on it, and then stir with a glass rod, if it is turbid and white, it indicates that the grease is easy to emulsify, not anti-water and grease.

There are three ways to help car owners choose the right lubricant:

The first is to observe. If the engine oil is clear and yellow-brown, it means that its quality is better; If the color is cloudy or emulsified, it means that it contains a lot of water; If the oil has a burning smell, it means that it has been oxidized prematurely or mixed with other oils.

The second is to check whether there is sediment, and the sediment is by no means a good oil.

Third, you can drop the oil on the iron plate or exhaust pipe above 110, if there is a popping sound, it means that the oil contains water.

1.Choose the right lubricant for your car.

The lubricant should be selected according to the requirements of the engine, and neither too high-grade oil can be used on the less demanding engine, nor can the lower grade oil be used on the more demanding engine. The choice of lubricating oil can be upgraded on the basis of the manufacturer's recommendation, or the use of synthetic engine oil for better performance.

It should be noted that it is best to use a lower viscosity oil for new cars, such as 0W W-40 and 10W-40, which can make the lubricating oil flow faster and reduce wear at start-up. If it is in the high temperature season or the engine has been worn to a certain extent, it is necessary to choose a high viscosity oil, such as 15w-50, etc., which is conducive to the formation of a thicker oil film, maintain the pressure of the oil, and reduce oil consumption.

2.It is better not to add additives to the lubricating oil again.

The lubricant itself is made up of base oils and additives, and its formulations have been extensively tested and screened. Experts said that it is generally not recommended to add additives to lubricating oil, and then adding additives may be counterproductive, not only reducing the original cleaning and anti-wear function of lubricating oil, but also increasing oil sludge and carbon deposits, affecting the performance and service life of the engine. And here is a reminder to car owners and friends that while replacing the lubricating oil, the lubricating oil filter element generally needs to be replaced, so that the newly replaced lubricating oil can play a better role.

Lubricant products between different brands cannot be mixed.