| In the process of manufacturing SMD LED, electrical parameters, optical parameters, colorimetric parameters are discrete for that material and craft can’t be completely the same. And different industries need the same type of SMD LED with the different parameters.So SMD LED should have optical test, electrical test, colorimetric test,and is classified by the test results. However, because of its small size, it is impossible to test and sort artificially SMD LED. So it is necessary to develop a automatic machine test and sort SMD LEDAfter the analysis of the working principle of the machine,the researcher makes the scheme of the whole machine and model the main motion components by Solidworks, and then make the design and simulation for the relevant key parameters through the modern analysis software. The main work is as follows:1. From the perspective of the machine running, briefly describe the test principle, the process, the test system, control system and mechanical system of SMD LED automatic test sorting equipment, in which the mechanical system of the main moving parts (the feeding mechanism, the transferring-material turret, the testing mechanism, the sorting mechanism) made a detailed structural analysis.2. The transferring-material turret is an important one which transfers SMD LED among the work stations, in which the dynamic vacuum force of the ceramic nozzle directly determines its efficiency. Firstly, make kinetic analysis and equations for SMD LED on the transferring-material turret, and then calculate the dynamic vacuum force in line with dynamic.3. The role of feeding mechanism is to place SMD LED on the ceramic nozzle of the transferring-material turret from vibration feeding system. In order to ensure that the feeding mechanism has no too big vibration in the process of high-speed movement and frequent acceleration and deceleration, it should have the enough dynamic stiffness and strength. Therefore, its rigid-flexible multi-body dynamic model is established with the modern analysis software, ANSYS and ADAMS, to analyze its dynamic stiffness and strength. Finally, the result showed no significant jitter in the running.4. The testing mechanism is to make the test probe timely close and open so that there are the stable contact between the electrode and the pin in the desired period. The suitable period ratio of the cam system is got by the dynamic response analysis of the follower so that the vibration in work travel period does not last until far telogen period in which there are the stable contact between the electrode and the pin. Also, the profile of the cam is got with reverse design through using ADAMS, at the same time, the spring stiffness is also gotten, to avoid the cumbersome traditional design. After getting the profile of the cam and the spring stiffness, the simulation is made for the testing mechanism,the result suggests that there be the stable contact between the electrode and the pin in the desired period.5. The sorting mechanism is to send the tested and classified SMD LED to the corresponding cylinders. It is ensured that the sorting mechanism has no too big residual vibration time and amplitude, so the motion trajectory of the sorting arm is optimized in order to suppress the residual vibration. First, the Mathematical model of the moving sorting arm is established.In order to get the more accurate model, the longitudinal displacement and nonlinear curvature Caused by the big bending deformation should be considered, then, the motion equation of the arm is established with the Lagrange’s equations and the modal method.Finally, the motion path is optimized with PSO to suppress the residual vibration.It is found that the machine completely achieve the expected requirement through testing the physical prototype. It can meet the customer’s request after it is delivered to the market. |
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