The variety, type and size of the bearings are varied. In order for the mechanical device to exhibit the desired performance, it is essential to choose the most suitable bearing.
For the selected bearings, Bearings the need to analyze a number of reasons, from all angles to study, evaluation of the choice of bearing procedures, and no special specifications, but the general order is as follows:
(1) Bearings to master the use of mechanical devices and bearings and so on
(2) clear the requirements of the bearing
(3) the type of bearing selected
(4) Bearings selected bearing configuration
(5) selected bearing size
(6) selected bearing specifications
(7) selected bearing installation method
Bearing conditions and environmental conditions
Correctly grasp the bearing in the use of mechanical parts and the use of conditions and environmental conditions is to choose the premise of suitable bearings. Bearings To do so, you need to obtain the following aspects of data and information:
(1) the function and structure of the mechanical device
(2) the use of bearing parts
(3) bearing load (size, direction)
(4) Rotation speed
(5) vibration, shock
(6) bearing temperature (ambient temperature, temperature rise)
(7) Ambience (corrosive, clean, lubricity)
Selection of bearing configuration
In general, Bearings the shaft is supported by two bearings in the radial and axial directions. At this time, the bearing on one side is called the fixed side bearing, which is subjected to both radial and axial loads, The relative axial displacement between the role. The other side is called the free side, only bear the radial load, the axial can be relative to move, in order to solve the temperature changes caused by the expansion of the shaft and the installation of the bearing spacing error.
For fixed side bearings, Bearings the need to select the rolling surface can be used in the axial movement (such as cylindrical roller bearings) or to the assembly surface movement (such as radial ball bearings) bearings. In the case of a relatively short shaft, the fixed side and the free side are not used, the use of only one-way fixed axial movement of the bearings (such as radial thrust ball bearings).
Bearing detection method
(A) noise detection method:
It is a direct measurement method of abnormal sound by extracting the sound pressure signal of the bearing with a certain distance and direction in the silencing environment with the basic noise less than 20db, and extracting the abnormal sound component by certain analysis method.
(B) vibration detection method:
Is an indirect sound indirect detection method, can be divided into qualitative detection method and quantitative parameter detection method. Among them, Bearings qualitative detection method is divided into monitoring abnormal sound method and observation vibration waveform method. Quantitative parameter detection method refers to the measured vibration signal with the abnormal sound of the measured parameters such as: the peak vibration, crest factor to evaluate the bearing abnormal sound.
(C), measuring the bearing abnormal sound measuring instruments:
Measuring the bearing abnormal sound of many measuring instruments, such as: Hangzhou Bearing Experimental Research Center BANT-1 bearing abnormal sound monitor; Shanghai Bearing Technology Research Institute S092 bearing vibration (abnormal sound) measuring instrument; Luoyang Bearing Research Institute and Dalian bearing Instrument factory jointly developed S0910-Ⅲ. These bearing measuring instruments can measure the effective value of the bearing vibration and can measure the peak, peak factor and pulse number of the abnormal acoustic parameters.