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Dongguan Minz Rubber & Plastics Co., Ltd.

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How to improve the quality of the rotating seal ring specification end face to reduce the leakage phenomenon?

Release time:

2019-06-10 12:30

Source:

How to improveRotating seal ringSpecification end face quality reduction leakage phenomenon?
 
1.1 improve the quality of the end face of the seal specifications The contact condition of the sealing lip and the joint surface is the key to affect the sealing effect. When the surface of the journal is too rough, through the thin oil film and the sealing lip easy dry contact, resulting in the rotating seal ring wear, so to control the surface roughness and hardness of the seal. Under the working conditions of low speed, good lubrication and less pollution, it is allowed to reduce the hardness of the journal. The surface of the journal that cooperates with the rotating seal ring shall be a non-helical surface.
 
The reason for the spiral line on the journal surface is that when finishing the grinding wheel, the trajectory of the diamond on the dresser is a spiral line, so a spiral line is formed on the surface of the grinding wheel. In this way, the grinding wheel will form a spiral line on the surface of the journal when machining the journal. This spiral line will scratch the sealing surface when the shaft rotates and affect the sealing effect of the sealing ring. Therefore, it is recommended to use the cutting type grinding journal processing method.
 
1.2 Before assembling, check the quality of sealing parts. Before installing the rotating sealing ring, check the quality of the rotating sealing ring. If it is found that there are gaps and cracks in the lip, rubber aging, spring rust or failure, etc., they cannot be used. At the same time, the tolerance of the mounting hole of the rotating seal ring must be strictly controlled. If the aperture is too large, there will be a gap between the rotating seal ring and the hole, causing oil leakage; on the contrary, if the aperture is too small, the rotating seal ring will be deformed and cannot be used.
 
1.3 Reasonable replacement of hydraulic oil (lubricating oil) The hydraulic oil used in the construction machinery system is subject to mechanical friction, agitation and shear and air intrusion, which is easy to oxidize and deteriorate and form a large amount of abrasive particles. Once it enters the mating surface of the rotating sealing ring, it will cause the rotating sealing ring to leak. It is suggested that the oil should be changed when the new equipment is tested for the second time, so that the particles generated by severe wear in the early stage should be discharged in time, so the hydraulic oil should be replaced in a timely and reasonable manner.
1.4 Rectification of the assembly process Use professional auxiliary modification tools to ensure that the surface of the journal at the seal of the rotary seal ring is not scratched, the lip is not damaged, and the lip of the rotary seal ring is installed in the correct direction. In different cases, the installation requirements are different. When the hole is straight and the end face is machined, the installation tool must press the rotary seal ring to the machined face. When the hole is stepped, the installation tool must press the rotary seal ring to the end face of the step. When the hole is straight and the end face is not machined, the installation tool must press the rotary seal ring to the end face of the shaft.
 
1.5 Seal Material Quality Importance When using a rotating seal ring mainly to prevent lubricant loss, the sealing lip of the rotating seal ring should be installed inward. If the main purpose is to prevent the ingress of contaminants, the sealing lip should be installed outward. When used in an environment with more dust or rain, a rotary seal ring with a secondary lip should be used. Therefore, the material selection of silicone rubber seals, followed by the selection of fluorine rubber, NBR rubber sealing material. In addition, attention should be paid to controlling the vibration of the machine and the eccentricity of the spindle to reduce the probability of oil leakage.

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