Seals are materials or parts that prevent fluid or solid particles from leaking from adjacent binding surfaces and from external impurities such as dust and water invading parts and components inside machine equipment. The following are the installation and storage precautions of seals:
1. Installation precautions for self-tightening rubber oil seal of frame
(1) before installing the oil seal, it is necessary to check whether the surface of the shaft neck is too rough and there are no scars, especially long scars without axial direction. If the surface of shaft neck is too rough, it is easy to damage oil seal or accelerate the wear of lip 1:3, and damage its sealing performance. If the surface of the shaft neck is not properly disassembled and installed, it will cause a serious bruise on the blunt blow, which will cause the sealing lip and the surface of the shaft neck not to be properly attached, resulting in oil leakage. In both cases, after surfacing and welding the wound part, the lathe wheel can be rearranged according to the specified size of the journal, or a new shaft can be replaced. If the shaft neck only has metal burrs or shaft head flanges, a file can be used to repair and smooth the shaft neck to prevent damage to the sealing lip when installing the oil seal.
(2) check whether there is any defect, crack or oil corrosion in the lip of oil seal. If there is any such defect, replace the new oil seal.
(3) when installing the oil seal of the framework, special installation tools shall be adopted to prevent the oil seal lip from being stretched and deformed or damaged by scratch. Without this tool, available to play for installation: first in shaft neck and shaft head and roll on a layer of transparent hard plastic (commonly known as cellophane), with a little oil on the surface, the oil seal set into the shaft head with plastic film, firstly will slowly push oil seal to the journal, and then take out the plastic. Attention: do not put the direction of the lip mouth wrong, should make it toward the inside of the oil storage, the trademark, specifications of the side to the outside. Because the lip 1:3 can only be one-way sealing, if the oil seal is installed in reverse, it will inevitably cause oil leakage, the sealing effect is weakened or invalid. Avoid to install oil seal slanting or use tools such as hammer stick in the oil seal surface to knock violently, otherwise easy to cause damage to the oil seal.
(4) during installation, the oil seal (especially at the lip and mouth) and the shaft and neck should be kept clean, and attention should be paid to prevent the oil seal from sticking out of the spring groove. If the self-tightening spring is relaxed and the elastic force is weakened, it can be cut off according to the situation.
2. Installation precautions of rubber water-blocking ring
Resistance of cylinder liner hydrosphere is an "O" shape rubber parts, cross section is round more, compared with skeleton oil seal, simple structure, frameless, and since the spring, relying on its suppleness and elasticity of rubber airtight. Improper installation, can make the jacket in a large number of cooling water leaking into the crankcase, causing oil metamorphism, lubrication quality, increased engine wear of moving parts, and even produce the major fault, such as tile burning holding shaft is installing a resistance hydrosphere should pay attention to the following:
(1) if the resistance is hydrosphere carefully or cylinder liner water seal groove is too deep, make the resistance hydrosphere load cylinder liner water seal tank after failed to curved surface above a certain height, at this point, can be in the bottom of the water seal tank and put a layer of asbestos rope, coated with water resistant calcium base grease, then block water trap into the water seal tank and then put the liner pressure people body hole.
Hydrosphere (2) if the resistance is too thick or cylinder liner water seal tank is too shallow, curved surface too much higher resistance hydrosphere after loading, the liner installation difficulties, not only will be crushed with rubber seal even smash cylinder liner, emery cloth uniform grinding rubber seal are available, and until it is put into a water seal tank after right projection. Then apply the grease on the surface of the rubber ring to press the cylinder sleeve into the seat hole of the body.
(3) if the resistance hydrosphere thickness uneven or water seal tank two-tone, rubber ring the bulging height not divide evenly, with the cylinder liner is a question of rubber ring, should be carefully checked and the problem of water seal tank, there will be problems of parts replaced.
(4) clean the rubber ring and water seal groove before the rubber water trap enters the water seal tank of the cylinder sleeve, and avoid bringing impurities into the installation. When the rubber ring is mounted on the cylinder sleeve, it should be carefully checked whether it is torsional or otherwise dirty. Before installing the cylinder sleeve, the dirt on the cylinder body should be carefully removed, and a layer of machine oil should be applied on the bottom bearing hole surface, and then the cylinder sleeve should be slowly pressed into the bearing hole.
2. Seal pieces should be properly kept when not in use
1. Anti-aging: avoid light and moisture, place flat and keep away from cold and heat sources;
2. No pressure: keep the seal naturally relaxed and change its physical shape without external force;
3. Classification labeling :(same shape, different materials, parts used, applicable standards, purchase date, etc.)