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Sealing technology Home > News > Sealing technology

How to choose and install engineering machinery rubber seals

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Update time : 2019-03-12 09:36:12
​In the repair of engineering machinery, the selection and installation of rubber seals is very important, which requires engineers and technicians to have certain equipment tips and identification skills, as long as this can improve the repair quality. Below we will briefly describe the selection and installation of hydraulic seals in construction machinery.
First of all, we must select large distributors at the time of procurement, and purchase rubber seals produced by the standard factory, which is best purchased directly from the outlets of the manufacturers. Secondly, it is necessary to understand the origin of the rubber seal trademark when purchasing, whether there is a commodity certificate, the product operation manual, the precautions, the specific address and contact number of the manufacturer, the date of production, and the shelf life. The oil seal for special use, such as perfluorinated oil seal, has the characteristics of high temperature resistance, high pressure resistance and corrosion resistance, and the oil seal has the word “F”.
All parts must be viewed before the rubber seals are installed. The first thing to look at is the quality of the oil seal. Look at the margins, whether there are burrs, cracks, openings, etc., especially the lip of the oil seal. Good quality rubber parts (such as O-rings) have a glossy appearance, excellent elasticity and flexibility. They will stretch when pulled by hand. When they are loosened, they will recover and disappear without any elastic deformation. Poor O-ring seal, the appearance of black, rubber odor, poor elasticity, will not recover after recovery or recovery time is longer.
In addition, the device should be compared before the first, the first is to compare the shape and size of the new and old seals, if not the same, even if the tension device does not seal up. In addition, rubber seals and nylon seals cannot be substituted for each other.
Finally, you should also pay attention to the following items: There are two kinds of skeleton oil seals, one with a small tension spring and the other with no oil seal. The two oil seals cannot be exchanged. You can’t use rubber seals instead of rubber seals, such as loaders. Rotary oil seals in the torque device and some felt seals for the engine, nylon seals, etc.
In general, the O-ring seal ring can not be twisted when the device is installed, and the burr is centered outward; when the skeleton oil seal device is used, the lip should face the side of the seal pressure oil, and the device should be gentle, and it can not be hard hit with a hammer or a flat shovel. When the device is not in good condition, the rubber oil seal lip can be pressed in a little by special tools; when the nylon seal ring is installed, it is necessary to see if the oblique cut can be just closed.
In addition, due to different rubber varieties and additives, the oil resistance coefficient is also different; rubber oil seals can not be cleaned with gasoline,  fire oil, if there is oil on the oil seal, dirt, clean with clean cotton yarn; device O-sealing When the rubber ring is used, it is forbidden to be heated by fire roasting or boiled water. It can be stretched by hand to make it stretch. In winter, it can be soaked with warm water to enhance its elasticity.