The
original water guide the upper, middle and lower shaft sleeves are tin
bronze sleeve, by butter lubrication, butter for a long time difficult,
due to the lack of oil and shaft sleeve shaft sleeve dry friction,
coupled with sleeve The
lower part of the U-shaped rubber seal failure, infiltration of water
to the shaft sleeve, resulting in bushings, journal wear increased. In this switch axle sleeve minor overhaul, we will 24 water diversion
leaves, the central sleeve transformed into copper-based solid lubricant
self-lubricating inserts, the lower sleeve transformed into copper
backing polyformaldehyde sleeve.
The
middle sleeve is fitted by interference fit in the sleeve of the guide
thin-walled copper sleeves, which forms a friction pair on the upper and
the lower sleeves of the guide vanes. The material of the sleeve is tin
bronze. The overhaul will be on the replacement of copper sleeve inserts solid lubricants self-lubricating bushings. Sleeve
work, the solid lubricant on the sleeve and journal surface firmly
adhered to a layer of thin and smooth lubricating film. Due
to the presence of this lubricating film, the friction condition is
improved and the coefficient of friction (0.08-0.12) is low. The sleeve has excellent wear resistance, load capacity.
The
lower sleeve is fitted by interference fit in the bottom ring water
guide shaft hole, and the water guide vane form a friction pair. The overhaul of the original tin bronze sleeve pulled out from the bottom ring, put on the copper back polyformaldehyde sleeve. Copper-backed
POM sleeve combines the advantages of plastic and metal, both with good
wear resistance and wear resistance and high load bearing capacity and
dimensional stability. It is made of copper-plastic composite material. The composite
material is a three-layer self-lubricating bearing material which takes
copper plate as the base, spherical bronze as the intermediate layer,
polyoxymethylene as the friction surface, and is firmly combined.
In
the journal seal water guide vane shaft seal with the original U-shaped
rubber cup seal, the overhaul, the original U-shaped seal installation
difficulties, easy curling, easy to damage, leading to failure of water
stop the shortcomings of the transformation of double Layer O-type rubber packing seal structure. This kind of structure is easy to install and water-stopping effect is good. In
this sealing structure, two rings of specially made O-shaped rubber
packing are installed at the contact point between the sealing box and
the journal to prevent water and sediment from entering the sleeve
through the journal. One ring is installed at the contact between the
sealing box and the sleeve A special O-seal to prevent water and sediment from entering the sleeve from the outside of the enclosure. Seal box with stainless steel bolt multiples.
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