One. Lubricant storage
The lubricant variety trademark are very many, the performance respectively differently, the fat is easier than the oil to deteriorate, after also in the fat mixes in the impurity not easy to process, therefore in the enhancement lubricant storage quality control significance is extremely significant.
1st, in lubricant storage mass variation
After the lubricant long-term storage has following aspect mass variation:
1) appears the color change;
2) mixes in the lime sand, the dust and so on the mechanical impurity;
3) mixes in the moisture content or takes up water:
After 4) the long-term storage separates out the lubricating oil, forms the hard lump, appears the soap separation, the production acidic material, corrodes and so on not not qualified.
2nd, in the storage causes the lubricant deterioration reason
In the storage causes the lubricant deterioration reason to include: Exterior introduction impurity, moisture content; Lubricant itself physics or chemical change.
3rd, in the postponement lubricant storage deteriorates measure
1) the lubricant first goes into storage, reduces the temperature, the moisture content, the dust and so on the influence;
2) reduces the storage temperature;
3) in view of the different type lubricant characteristic, the enhancement has the pointed management;
4) pays attention to the seal storage;
5) pays attention takes the fat tool, vessel clean;
6) regarding the different user, uses the large, medium and small different packing form;
7) pays attention to keeps in stock the lubricant the regular chemical examination.
Two. Expiration main manifestation:
1st, oxidative rancidity
2nd, fat colloid disarrangement of the structure
3rd, base oil display
4th, the fat divides the oil and the outflow
5th, the foreign matter mixes in
6th, the fat gets older (hardening, loses lubrication)
Conforms to following one of them, is the expiration:
1st, thickness change, achieved when ± (15~20)%, must trade the fat generally;
2nd, the drop out point change, to the soap base fat, following namely sentences for the aged expiration:
Lithium base fat 140℃ below, Sodium base fat 120℃ below
Calcium soap grease 50℃ below, Compound aluminum 180℃ below
Compound lithium 200℃ below, Other, the change surpass ±20%
3rd, acid value change
Lubricant acid value >3mgKOH/g namely expires
4th, the mechanical impurity content, following is the expiration
Fe>1%
Or Cu>3%
Or ash content rate of change >50%
Three. Lubricant expiration analysis
The (1) physical factor causes expiration
The lubricant can simultaneously receive the mechnical shear and under the centrifugal force function in the use the lubricant can fling touches
Scratches the contact surface to cause its minute oil, causes the lubricant oil to reduce, the penetration reduces hardens, the lubricant completely will expire after certain degree; Under the mechnical shear function, the lubricant structure receives the destruction (like soap textile fiber to withdraw or orientation), causes its conditioning, thickness drop and analyzes the oil mass increase and so on, finally causes the expiration.In the usual situation, the lubricant use passes on fast increases 2000r/min, its life will reduce one about the half.Under the high shear stress, the rotational speed doubles, the service life is only equal to original life 1/10.
The (2) chemical factor causes expiration
In the lubricant and the air oxygen has the chemical reaction to produce the acidic material, it first is consumes in the fat the oxidation resistance chemical additive, but after certain degree, the production organic acid can the dipping part and destroys the fat the structure, causes its drop out point to drop, the base oil viscosity increase and the mobile change in sexuality is inferior.The massive experiments indicated that, the temperature is higher, the lubricant life drops obviously.If temperature when 90~100 degrees, the temperature elevates 19 degrees every time, the fat life reduces approximately one half, but when 10~150 degrees, the temperature will elevate 15 degrees every time, the fat life also drops one half.
In addition, in the lubricant use environment moisture content, the dust and the noxious gas and so on also are cause its deteriorated the important attribute.For example: In the fat mixes in attrition particles and so on the copper, iron, lead and bronze, can to the fat oxidation catalytic effect.In brief, the lubricant expiration reason are very many, sometimes possibly causes by some reason, but more is many kinds of factor its synergy result, or take one kind of reason as a breach, then other reasons affect together.
Four. Lubricant correct use
The (1) replenishment lubrication quantity must be suitable
Stuffing quantity oversized, can cause the friction moment to increase, the temperature increment, consumes the fat quantity to increase; But stuffing quantity too few, then cannot obtain the reliable lubrication to have the dry friction.Generally speaking, suitable stuffing quantity for bearing in total void space 1/3~1/2.But acts according to has the situation, sometimes should spread the fat in the bearing edge to implement the cavity lubrication.
The (2) attention prevented different type, trademark and the new old lubricant mixes uses
Avoids installing the fat vessel and the tool overlapping use, otherwise, will produce the drop out point to the fat to drop, the penetration increases with the mechanical stable drop and so on affects not good.
(3) takes to replace the new fat work
As a result of the Run fat variety, the quality all when unceasingly the improvement and the change, the old equipment changes to the new lubricant, should first pass through the experiment, after the test only then officially uses; When replaces the new fat, should eliminate the waste lubricant first, is clean the part clean.When supplement lubricant, should abandon the Run fat to squeeze out, sees the new lubricant when the row of fat mouth up to.
(4) takes the replenishment lubricant process the management
In receives with the replenishment lubricant in front of, must pay attention to the vessel and tool clean strictly, on the equipment should clean beforehand for the fat mouth cleanly, takes strict precautions against the mechanical impurity, the dust and sand grains interfusion.
The (5) attention season uses the fat the prompt replacement
If the equipment locates the environment winter and Xia Li and the temperature difference change is big, if the summer has used the winter fat or opposite, the result all will work just the opposite.
(6) pays attention to regular Canada to trade the lubricant
Lubricant Canada trades the time to be supposed to act according to the concrete service condition to decide, both must guarantee the reliable lubrication and as for not to cause the fat waste.
(7) do not have to use wooden or the paper system vessel packing lubricant
Prevented loses the oil to change hard, mixes in the moisture content or is polluted the deterioration, and should deposit in the cool dry place.