关键词: 碲化镉量子点, 非接触测温技术, 旋转组件测温, 滚动轴承

Abstract:

In condition of high rotation speed, the inner ring temperature is more sensitive to the early fault information of bearing. Thus the research on the inner ring temperature measurement technology can better monitor the working condition of the bearing. Based on the temperature sensitive properties of quantum dots, a noval idea for rolling bearing rotating assembly (inner ring, cage, etc.) temperature measurement, using fluorescence spectra characteristics to obtain the surface temperature information of bearing rotating assembly, is proposed. The non-contact temperature measurement principle of CdTe quantum dots is briefly introduced. The DDA polyelectrolyte-CdTe quantum dot composited film of temperature sensor is prepared, according to the layer-by-layer self-assembly method. The properties of parameters, such as spectrum intensity, peak wavelength and the full width at half maximum of CdTe quantum dots, and the linear reversible change of the peak wavelength of quantum dot with temperature, are obtained, which is verified and calibrated in different temperature cycle and rotation regime. The experimental rig is set up to measure the inner ring temperature of angular contact ball bearing in working condition, and the non-contact temperature measurement technology rolling bearing inner ring is realized. The inner ring temperature rise curve of inner ring is obtained successfully. The indirect verification is carried out using the traditional thermocouple test method which indicates the error of the new method meets the engineering requirement.

Key words: CdTe quantum dots, non-contact temperature measurement technology, rotating assembly temperature measurement, rolling bearing