Oil leakage from the exciter of the vibrating dewatering screen is a concern
for many customers. Oil seeps out from the end cover or shaft extension of the
exciter and flows along the screen box to the screen surface, staining the sand
with oil spots and affecting the quality of the finished product. If oil leakage
is not treated, the internal oil level of the exciter will decrease, and the
bearing lubrication will be insufficient. Mild cases may cause temperature rise,
while severe cases may result in bearing burnout. The problem usually lies in
the sealing components and assembly accuracy.
The aging and failure of skeleton oil seals is the most common cause of oil
leakage. The extension of the exciter shaft is blocked by the skeleton oil seal
to prevent the leakage of lubricating oil. Under long-term high-frequency
vibration and temperature rise, the rubber lip gradually hardens and wears, and
the sealing ability decreases. Oil then seeps out from between the lip and the
shaft neck. It is recommended to check the condition of the oil seal every six
months, press the lip with your fingers, and replace it immediately if it feels
hard or cracked. When installing a new oil seal, apply an appropriate amount of
lubricating grease to the lip, with the lip facing towards the bearing side. If
installed upside down, it will leak faster.
The failure of the sealing glue on the end cap joint surface can also lead to
leakage. The end cover of the exciter is fastened to the housing with bolts and
sealed with sealant. After long-term vibration, the bolts loosen, the sealant
ages and cracks, and oil seeps out from the joint surface gaps. Every time the
exciter is disassembled, thoroughly remove the old sealant, reapply a layer of
oil resistant sealant, and then tighten the bolts. Tighten in diagonal order two
to three times during tightening to ensure even force distribution on the joint
surface.
Excessive oil level or blocked vent holes inside the exciter can also cause
oil leakage. When the refueling amount exceeds the centerline of the window, the
splashing of oil intensifies during the operation of the exciter, the internal
pressure rises, and the oil is squeezed out from the weak seal. Fill the oil
level according to the instructions, do not add too much. After the ventilation
hole is blocked, there is no way to release the internal pressure, which will
also push the oil out of the oil seal. Check the ventilation hole once a month
to see if it is unobstructed.
During daily inspections, observe whether there are oil stains at the bottom
of the exciter during each shift. If any leakage is found, it should be dealt
with promptly. Do not wait until the oil level reaches the bottom to pay
attention. Encountering problems during equipment operation, welcome to contact
the technical team of Shandong Heavy Industry for communication: Manager Zhang
13583776655 (same as WeChat).