1. Hole throttle:
(1)
The internal throttling to an external throttling, and install a
pressure gauge immediately shows the pressure on the chamber. Make maintenance easy, in particular, can be easily cleaned on a regular basis, which is the internal throttle can not match.
(2). Throttle ratio. Throttle than the theoretical value of β is between 1.2 to 1.5, but based on years of experience to 1.25 is better. This
maintenance, the need for geometric precision spindle, before and after
the bearing geometry, concentricity, roundness and taper strictly
controlled in order to ensure the beta value. According to the bearing capacity of the machine to determine the
value of e (spindle and bearing geometric center eccentricity), the β
value of the best.
(3)
When the oil chamber is not installed spindle, the oil column of each
outlet must be consistent (observation method), if inconsistent, should
be taken to change the throttle aperture method to change its flow. To 4 cavities, for example, under the general, left and right
cavity of the oil column between 20 ~ 25mm, hole diameter of 0.25 ~
0.4mm.
2. Film feedback throttle:
Film
feedback throttle bearing stiffness is great, but the machine often
appear in the operation of tile, pull hair, drop off and so on. Film
feedback is the most critical film, in practice that the bearing lock,
the main reason for the hair is: ① plastic deformation caused by the
film; ② slow feedback. External load mutation, the film has not yet reacted, the shaft and the tile has been rubbed; ③ film fatigue. Film using a long time, fatigue deformation, equivalent to changing the feedback parameters.
The company is located in:
Increase the thickness of the film and switch to some fatigue-resistant materials, can receive good results. The general is the use of rigid film, preload, the method of reserving the gap. The
specific approach is: the 1.4mm thick film changed to 4mm thick rigid
film, the lower cavity pad 0.05mm thick foil paper, the spindle adjusted
to the position 0.05mm higher than the ideal position. The purpose is to return to the ideal center exactly when the spindle is stressed (wheel weight, cutting force).
3. Fuel system improvements:
Static
pressure bearing oil supply system, in addition to coarse filter, fine
filter, the rest of the components of hydrostatic bearings have a
protective effect. On the basis of the original system to improve the fuel supply system.
(1).
The oil outlet behind the throttle plate is connected with pressure
relay and pressure gauge (formerly in front of the accumulator) so that
the operator can see the size of the chamber pressure and inlet
pressure. When the pressure is greater than a certain value, in order to immediately shut down, so as to avoid bearing pad lock. Such as: import pressure 2MPa, outlet cavity pressure 1.2 ~ 1.6MPa, less than 1.2MPa will stop.
(2) Increase the number of detection devices:
Static
pressure bearings between the spindle and bearing 0.04 ~ 0.05mm gap
between the oil has a certain resistance, the detection of this change
in resistance, you can know the size of the gap. To the pole as a pole, bearing the other pole, measuring the resistance changes. This
signal processing sent to the photoelectric alarm and control system
amplifier, control the spindle motor start and stop, in order to avoid
the shaft and tile friction.
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