1 Orifice Compensated:
(1) change the internal throttle to external throttling, and to install a pressure gauge real-time display the upper and lower chamber pressure. The so convenient maintenance, in particular, can be easily be cleaned regularly, this is internal restrictor unmatched.
(2) The throttle ratio. Throttle is than beta-theoretical value is between 1.2 to 1.5, preferably 1.25, based on years of experience. So that in the maintenance of the geometric accuracy of the spindle before and after the bush geometric accuracy, concentricity, roundness and taper strictly controlled in order to ensure that the beta value. According to the carrying capacity of the machine to determine the value of e (the spindle and bearing geometric center of the eccentric amount), so that the beta value.
(3) the oil chamber when the spindle is not installed, the outlet port of the oil column must be the same (observation), and if not, should be taken to change the restrictor aperture to change its flow. 4 cavities, for example, under Usually, the left and right chamber of the oil column in the range of 20 ~ 25mm, the diameter of the orifice for the 0.25 to 0.4 mm.
2 thin-film feedback restrictor:
The film feedback throttle bearing stiffness is great, but the machine in operation often hold tile, brushed off the pressure on. The film feedback is the most critical film, practice, bearing locking, The nap was mainly due to: (1) thin-film plastic deformation caused by slow feedback; (2). External load mutation, the film did not react, the axis and tile friction; (3) film fatigue. Film using a long time, fatigue deformation, which is equivalent to changing the feedback parameters.
Increase the thickness of the film and switching to some fatigue-resistant materials, can receive good results. The generally rigid film preloaded reserved slits. Practice: 1.4mm thick film to 4mm thick rigid film, inferior vena pad 0.05mm thick aluminum foil, so that the spindle to adjust to than ideal position 0.05mm. Force when the spindle (wheel weight, cutting force), just return to the ideal center.