Vibraciniai guoliai

Antivibraciniai tepalai

Vibraciją absorbuojantis tepalas

Vibration Resistant tepimas 

Rūšis

Darbinės temperatūros, ºC

Lašėjimo temperatūra, ºC

Pagrindas

Panaudojimas, savybės

 

 

IKV

Bessil CB-2

 

 

 

-20 iki +220

 

 

 

-

 

 

Silikon /

Angl-jod

 

Labai unikalios formuluotės vidutinio klampumo Phenil-Metil-Poli-Siloksanų bazinės alyvos ir jodintos anglies tirštiklio pagrindo

tepalas padidintos vibracijos mazgams.

Puiki atspara karščiui, drėgmei, korozijai. Nemaišytinas su kitais tepalais. Efektyviai mažina vibracijas krosnių išmetimo ventiliatoriuose. Juodas.

 

 

 

Molyduval

Polypan LA 1 T

 

 

 

 

-50 iki +120

 

 

 

190

 

 

 

 

sintet  PAO + PTFE

 

Teflono sudėtyje turintis antifrikcinis, žematemperatūrinis sintetinis guolių ir dantračių tepalas, ypač tinkantis plastikiniams mazgams. Slopina triukšmą ir nuima vibracijas. Baltas.

Specialūs tepalai visiems vibruojantiems mazgams

Vibration Analysis Detects Inadequate Lubrication in Fan Bearing

In some cases, it is possible to detect the effect of inadequate lubrication within a rolling element bearing by utilizing vibration analysis as a preventive maintenance tool. This ability to detect lubrication deficiencies with vibration analysis was proven at one facility when a noise was heard in an electric fan motor.

The electric motor is one of six fan motors installed on a cooling tower at a large refinery in England. All six are lubricated with Molylub HVS Grease 2 semisynthetic high-speed bearing grease, and are included in the production unit lubrication program.

During the routine scheduled vibration monitoring activity, this electric motor was observed by the condition monitoring operative to be emitting an intermittent high-pitched noise from the nondrive-end (NDE) bearing location, albeit very low in amplitude. Routine overall vibration readings taken throughout the motor exhibited readings below 1 mm/sec rms and were consistent with previous values.

This prompted further “in-field” investigation to determine the location and/or cause of this noise. This investigation was carried out by setting the portable vibration data collector into “analyzer” mode. With the required collection set and frequency max selected, real-time data was obtained from both the NDE and drive-end (DE) motor bearing locations while the motor was at full speed; this data was taken in all three axis (where access permitted).

Atsparus vibracijai tepalas

Vibraciją guolyje slopinantis tepimas

Proper lubrication is crucial to ensure smooth operation in machineries. In rolling bearing, the improper lubrication may induce high friction and vibration level due to metal to metal contact between the rolling elements. In this study, the roller bearings with and without lubrication are investigated. The natural surface degradation of the roller bearing is monitored and the surface roughness is measured for the lubricant film thickness calculation. The film thickness is determined by the HamrockDowson equation which showed that the grease lubricated bearing operated under the elastro-hydrodynamic lubrication, with the ratio of lubrication film thickness to the surface roughness of λ in the range of 0.9 to 3.65. The un-lubricated bearing was damaged after 20 minutes whereas the grease lubricated bearing continued to operate for 6600 minutes. The observation under microscope showed that the surface underwent smoothening process where the surface roughness decreases initially (running-in state) followed by roughening at the steady state where the surface roughness increases. At damage, the value of λ = 0.9 can be associated with the high level of the bearing vibration. The increase of vibration level becomes rapid at the critical value of λ = 1.6. As such the overall vibration level of the bearing can be related to the surface degradation and low film thickness.

The vibration level of roller bearings is measured by using accelerometer (DYTRAN) that is mounted horizontally on the bearing housing. The accelerometer calibration is performed at the beginning of the measurement. The shaft speed is monitored by tachometer probe. The signals from accelerometer and tachometer are processed with LMS Test.Xpress software and hardware with the sampling rate set at 5 kHz. The vibration data is analyzed in term of root mean square (RMS) value. Lubricant Film Thickness Measurement The bearings are tested for un-lubricated and lubricated conditions. For unlubricated condition, the whole bearing is cleaned and submerged in ethanol for one hour. The intention is to remove all trace of lubricant for the bearing in the un-lubricated condition. For lubricated test, the SKF LGMT 2 0.4 grease is used in the experiment. The mineral base oil with Lithium thickener grease with viscosity of 110 mm2 /s at 40 °C and 100 °C at 11 mm2 /s is used. Surface roughness measurement is performed periodically in order to measure surface roughness for film thickness and lambda calculation. In order to do that, the lubricated bearing is removed every 30 minutes and cleaned for the characterization. For un-lubricated bearing, the bearing is removed more frequently as early damaged is expected. After characterization, the bearing is relubricated and remounted. The surface characterization is performed by using Infinite Focus Microscopy (IFM). The lubrication condition is determined through minimum film thickness between the inner race and roller which present tribological contact in rolling bearing. The minimum film thickness, hmin for roller bearing is calculated using HamrockDowson equation [16];