Two-way speed point contact photoelastic flow test bed

Abstract

The invention belongs to the technical field of optical interference test equipment and relates to a two-way speed point contact photoelastic flow test bed. The main body structure of the two-way speed point contact photoelastic flow test bed includes a guide rail, a ball box, servo motors, couplings, a small ball connecting rod, a ball support, a steel ball, a tension spring, a glass disc, a threaded pressing plate, a bearing, a main shaft, vibration exciter connecting rods, a vibration exciter shaft sleeve and a vibration exciter threaded support. When the two-way speed point contact photoelastic flow test bed is to be used, the two-way speed point contact photoelastic flow test bed is connected with a camera, a microscope, a signal generator, a computer and two vibration exciters; the vibration exciters drive the steel ball to perform reciprocating motion and the glass disc to rotate; the microscope and the camera arranged on a support are used for recording the oil film image of the contact area of the steel ball and the glass disc in a test process and storing the oil film image into the computer; the No. 1 servo motor controls the rotation speed of the steel ball; the No. 2 servo motor controls the rotation speed of the glass disc; the vibration exciters control the axial reciprocating motion distance of the steel ball; the signal generator controls the frequency of the axial reciprocating motion of the steel ball; and the computer controls the magnitude of the initial load of the vibration exciters in the test process.

Description

Technical field: [0001] The invention belongs to the technical field of optical interference test equipment, and in particular relates to a two-way velocity point contact photoelastic flow test bench, which cooperates with an exciter, a signal generator and a computer to perform optical interference tests. Background technique: [0002] The optical interference method is a physical method designed using the principle of optical interference, and the main technical means are various interferometers. The interference of light is a phenomenon in which the light intensity distribution generated when several light waves (component waves) meet is not equal to the sum of the light intensity distributions caused by each component wave alone, and there is a phenomenon of alternating light and dark. The interference phenomenon is usually manifested as a fairly stable distribution of light and dark stripes in space; sometimes it is manifested as when a certain parameter of the interfer...

AI Technical Summary

Problems solved by technology

The method of controlling friction and wear often comes from the characterization of the test. With the development of tribology, the working conditions of the test research are becoming more and more complex. The existing one-way speed point contact test bench can no longer meet the needs of the test. For example: Chinese patent 201010198089.9 The heavy-duty photoelasto-hydrodynamic oil film measurement device is composed of three parts: 1. Motion mechanism, including servo motor, pulley, lead screw, slider and transparent material, wherein the servo motor is the power source, and the wire is driven by the pulley The screw is fixed on the slider, and the slider is driven by the screw to slide linearly on the guide rail. The slider is equipped with a transparent material, and its lower surface is pressed on the tested piece, forming a pair of contact with the tested piece. Body, the exposed width of the transparent material is slightly greater than the length of the roller; 2. The supporting mechanism includes a pair of fixed rollers and a pair of floating rollers. The tested piece is supported by a pair of floating rollers, and the pair of floating rollers , It is also supported by the above pair of fixed rollers and loading rollers. The fixed rollers and the loading rollers are respectively equipped with rolling bearings, which can realize pure rolling; 3. The loading mechanism, including the load weight and the loading roller at the other end, the load weight After the code is amplified by the lever mechanism, it is acted on the test piece by the loading roller, and the rolling bearing is installed on the loading roller; the incident cold light source passes through the narrow-band filter, irradiates the test piece through the microscope, and the interference image is also magnified by the microscope and transmitted by the CCD. to computer processing; Chinese patent 201610850701.3 discloses a high-speed heavy-duty roller photoelastohydrodynamic oil film measurement device including a motion mechanism, a loading mechanism, a support device and an image acquisition and processing system, and the motion mechanism includes a speed-regulating motor, a first shaft coupling gear, speed reducer, second coupling, rotating disk, bushing and transparent material, the speed regulating motor is connected with the speed reducer through the first coupling, and the speed reducer is connected with the speed reducer through the second coupling The shaft device is connected with the rotating disk, the rotating disk is connected with the sleeve, the transparent material has a protruding end and an insertion end corresponding to the protruding end, and the insertion end is inserted into the shaft In the sleeve, the protruding end is exposed to the shaft sleeve, the rotating disk drives the shaft sleeve, and the shaft sleeve drives the transparent material to rotate, and the loading mechanism includes a movable support, a lever, and a cylinder , a pressure sensor, a floating roller, a measured roller and a cylinder control system, the cylinder control system is electrically connected to the cylinder, one end of the lever is connected to the floating roller, the other end is connected to the cylinder, and the lever The middle part of the center is covered with the movable support, the floating roller contacts the measured roller, the measured roller is arranged below the floating roller, the supporting device includes an even number of supporting wheels, the An even number of supporting wheels is symmetrically distributed on both sides of the protruding end of the transparent material. The image acquisition and processing system includes an image acquisition device and an image processing system. The image acquisition device is arranged on the outside of the transparent material. The acquisition device is aligned with the tested roller, and the image acquisition device is electrically connected to the image processing system; a circular photoelastodynamic oil film measurement testing machine disclosed in Chinese patent 201811155691.7 includes a base and a Bearing seat, the base is provided with a driving mechanism, a loading mechanism, and an image acquisition and processing system. The driving mechanism includes a transmission spindle supported by the bearing seat, a sleeve is connected to the front end of the transmission spindle, and a glass ring is fixedly connected to the inner ring of the sleeve. , the roller to be tested is placed at the bottom of the inner ring of the glass ring; the loading mechanism includes a front lever set parallel to the axis of the transmission spindle, a rear lever perpendicular to the front lever and not on the same plane as the front lever, and a floating roller mounted on the front end of the front lever. Loading head, the floating roller presses vertically on the tested roller to form an oil film contact area, the front end of the rear lever exerts pressure on the rear end of the front lever, and a pressurized weight is hung on the rear end of the rear lever; image acquisition and processing system: includes Microscope, light source and computer for data acquisition and processing, the microscope has a high-speed camera that captures the oil film interference pattern formed in the oil film contact area and transmits it to the computer

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