Composite bearings with its high rotation accuracy, good steel, high bearing capacity, no wear, high durability. The following is the static pressure NTN bearings in the maintenance
process to explore and try to get some experience, for your reference.
1. Small hole restrictor:
(1).
The internal throttle to external throttle, and install the pressure
gauge to immediately show the upper and lower chamber pressure. So that easy maintenance, in particular, can be easily cleaned regularly, which is the internal throttle can not match.
(2) throttling ratio. The theoretical value of the throttle ratio β is between 1.2 and 1.5, and 1.25 years is based on years of experience. In
the maintenance, the geometric accuracy of the spindle, the geometric
accuracy of the front and rear bearings, coaxiality, roundness and taper
are strictly controlled to ensure the value of β. According to the carrying capacity of the machine to determine the e
value (spindle and bearing geometric center of the eccentricity), so
that the best value of β.
(3).
The oil chamber in the absence of the spindle, the oil outlet of the
oil must be consistent (observation method), if not consistent, should
be taken to change the throat of the throat method to change its flow. To 4 cavity, for example, generally under the left and right chamber
of the oil column between 20 ~ 25mm, small hole diameter of 0.25 ~
0.4mm.
3. Improvement of fuel supply system:
Static
pressure NTN bearing oil supply system, in addition to coarse filter,
fine filter, the remaining components of the static pressure NTN bearing
has a protective effect. In the original system based on the fuel system to improve.
(1).
In the throat of the outlet after the pressure relay and pressure gauge
(the original in front of the accumulator), so that the operator can
see the size of the pressure and pressure. When the pressure is greater than a certain value, in order to immediately stop, so as not to lock the bearing. Such as: pressure 2MPa, the export chamber pressure 1.2 ~ 1.6MPa, less than 1.2MPa will stop.
(2). Increase the number of detection devices:
Static
pressure NTN bearing between the spindle and the bearing between 0.04 ~
0.05mm gap, during which the oil has a certain resistance value, the
detection of this change in resistance, you can know the size of the
gap. To the spindle as a pole, the bearing for the other pole, measuring its resistance changes. This
signal is processed and sent to the photoelectric alarm and control
system amplifier to control the spindle motor start and stop, in order
to avoid the friction between the shaft and tile.
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