Design And Precision Test Of Closed-packed Ball Bearings For The Focusing Mechanism

When the target radiation detection and the material within the detector interact with eachother, it will produce photoelectric effect in sensitive area, this is the working principle ofphotoelectric detector. With the development of science and technology, photoelectric detectiontechnology has penetrated into all aspects of human life. Because of its high sensitivity, fastresponse, photoelectric detectors are widely used in precision guidance, alarm and otherdetection systems of military reconnaissance. The main content of this paper is the research offocusing mechanism, which is designed for a vehicle photoelectric detector of the laboratory.In the process of tracking and acquiring targets, In order to get a clear image of movingtargets, the target must be accurately imaged in CCD photosensitive surface. In the actual workprocess, the environment of the vehicle visible light detector is very complex, which is affectedby vibration, humidity, temperature changes and other various aspects. The image points willdisperse, resulting in the phenomenon of defocusing. If the focusing of the photo detector isimproper, the imaging points will spread, which makes the image of the CCD camera not clear.In order to get a clear image of moving targets, focusing mechanism is essential.This paper firstly introduces the design of modular vehicle photoelectric detector, putsforward the main design index of photoelectric detector. Based on the technical indicators of thephoto detector, by analyzing the traditional design and modes, this paper gives a design ofClosed-Packed Ball bearings for the focusing mechanism, then gets the UGNX3D geometric modeling and2D drawings, and makes detailed analysis for the specific structure, choice ofmaterials.At the same time the introduction of a contact friction theory-Hertz theory，is used inthe further discussion in the choice of the motor. In the electrical design, it introduces theworking principle of focusing mechanism system, in the error analysis, the error for thetransmission of the focusing mechanism and the shaking precision are calculated. and then weuse the finite element analysis software–HyperMesh to build touch with the analysis, furthervalidating its stiffness and mechanical properties. At last it does vibration experiments andshaking precision experiments through the0.2″auto collimation collimator at the workingfrequency. The experimental results prove that this focusing structure is characterized by hiscompact volume and high rigidity, and works well in the working frequency. The shakingprecision≤2", which meets the requirement for use.