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Oil Seal Easy To Disassemble, Easy Maintenance
- Jul 14, 2017 -

Oil seal, that is, the seal of lubricating oil. It is often used in a variety of mechanical bearings, especially the rolling bearing parts. Its function lies in the oil chamber and the outside world, the internal seal oil, external dust.

Oil seal and other seals have the following advantages:

1) oil seal light weight, less supplies.

2) oil seal installation location is small, small axial size, easy processing.

3) good sealing performance, long service life, the vibration of the machine and the spindle eccentric have a certain degree of adaptability.

4) easy to disassemble, easy maintenance.

5) cheap.

The oil seal can be used as a dust seal. However, when the dust is serious or in order to protect other seals, often use a special dust seal.

Dust-sealed materials, hydraulic machinery Multi-purpose rubber, pneumatic machinery Multi-purpose felts, aircraft and frigid tanks Working in order to deal with the external icing of the piston rod with metal, chemical industry to prevent the stick on the piston rods also use metal.

Dust seal is very important to protect critical hydraulic equipment. Penetrate the dust, not only wear the seal, but also greatly wear the guide sleeve and the piston rod. In addition, impurities into the hydraulic medium, will also affect the operation of the valve and pump function, in the worst case, it may damage these devices. Dust ring can remove the dust on the surface of the piston rod and debris, but damage the oil on the piston rod, which also has a certain role in the lubrication of the seal.

A lot of machine owners with no big trouble, but the phenomenon of oil leakage is very common, although not an important fault, but over time also makes a lot of trouble head of the machine, today for your Q & A trouble, about the principle of oil seal And maintenance methods.

Oil seal is an important part of all kinds of machinery and equipment, widely used. Its performance and quality of the direct impact on the use of mechanical equipment reliability. Some of the long life of the oil seal is a year, ranging from a few months or even three or five days, due to lax oil and oil scrapped. This situation has seriously affected the efficiency of mechanical equipment, not only increased fuel consumption and production costs, but also pollute the environment.

First, the working principle of oil seal

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1, free state, the oil seal lip diameter smaller than the shaft diameter, with a certain amount of interference.

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2, after installation, the oil seal edge of the interference pressure and self-tightening of the spring force on the rotation axis to produce a certain radial pressure.

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3, the work, the oil seal under the action of radial pressure, the formation of 0.25 to 0.5 mm wide sealed contact ring. Under the action of the oil pressure, the oil infiltration oil seal between the edge and the shaft to form a very thin layer of oil film. Oil film by the role of oil surface tension, in the shaft and oil seal edge along the formation of a "new moon" to prevent oil spill, play a sealing effect.

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Second, the main factors that cause oil spill oil seal Seal is the main factor causing oil spills. When the shaft wear to form a groove, even if the replacement of the new oil seal can not be sealed, because the oil seal lip and the contact pressure drop, resulting in the installation of the oil seal diameter and shaft diameter of the interference is too small.

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Third, the oil seal lax and oil spill countermeasures

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1, master and identify the basic knowledge of fake and shoddy products, buy high quality, standard oil seal.

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2, the installation, if the shaft diameter of the outer surface roughness or rust, rust, burr and other defects, to use fine sand or linoleum polished smooth; in the oil seal or shaft diameter corresponding to the location of cleaning oil or grease. Oil seal on the outer ring coated with sealant, with the hard paper to the shaft of the keyway parts wrapped up to avoid scratching the oil seal lip, with a special tool to seal the oil into the inside, do not hard to hit the hard to prevent oil seal deformation Or crush the spring and failure; if there is lip flanging, spring off and oil seal skew must be removed when reloaded. It should be noted that: when the shaft diameter is not worn and the oil seal spring is sufficient, do not tighten the inner spring.

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3, the application of agricultural machinery in the oil seal general working conditions are poor, the ambient temperature difference, dust and more frequent vibration of the machine to make mechanical conditions continue to change, to check, maintenance and maintenance.

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4, such as shaft diameter and bearing wear serious; oil seal rubber aging or spring failure, etc., should be promptly repaired and replace the corresponding parts.

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5, the abnormal heat of the parts or assembly should be promptly troubleshooting; to avoid mechanical speeding, overload operation, to prevent the oil seal lip temperature, rubber aging, early wear and tear mouth.

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6, to always check the oil level, if the oil impurities too much, there is alloy powder, metal iron scraps to completely replace the new oil. Change the brand and quality of oil to meet the requirements of the season.

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7, temporarily do not have the oil seal, should be properly kept to prevent stained with oil, dust or sun exposure.

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8, when the shaft diameter wear into a "V" -shaped groove, so that the new oil seal and the shaft contact pressure drop can not play the role of sealing oil, the choice of AR-5 two-component adhesive adhesive, both simple and reliable and wear The Can also be used to make up the method of oil seal shift.