Abstract
The sorting arm structure is under the inertia impact of high frequency reciprocating motion. The vibration characteristics are related to the operation process so that the precision of the chip sorting is uncertain. Thus, the accuracy of chips and efficiency of LED sorting machine are reduced. In the paper, the relationship between the vibration of the sorting arm and the positioning error of the chip has been studied. Besides, the correlation between the sorting arm structure’s vibration and the working precision of the separator are pointed out. The operation control is optimized based on the dynamics of the sorting arm and the operation parameters are optimized based on time sequence setting, in order to shorten the vibration attenuation time of the sorting arm for suppress vibration and provide efficiency. The incentives, which are introduced by variable structure and by the operation, can be effectively controlled. The array accuracy of chips and working efficiency of chip sorting machine are improved.
Highlights
As the LED market continues to expand, the demand for LED chip sorting equipment continues to increase [1]
Active inhibition is mainly divided into the following methods: such as PD feedback control method [3], optimal control method [4], transfer function method [5], inverse dynamics method [6], nonlinear decoupling method
Based the analysis of the dynamics of the sorting arm on the arrangement error of the chip, this paper proposes the operation control mode of sorting arm in combine with the dynamics of sorting arm and the precision of chip sorting
Summary
As the LED market continues to expand, the demand for LED chip sorting equipment continues to increase [1]. The Angle fluctuation of sorting arm rotation direction should be suppressed as far as possible in the process of arm picking and placement Another factor affecting the linear positioning error of sorting arm Y-direction is the length of sorting arm. It can be seen from the figure that the setting time of sorting arm operation process with the non-S-type velocity contour curve is 20 ms. Considering the influence of high frequency components introduced by sorting arm operation control on the vibration of sorting arm structure, the low pass filter is used to suppress high frequency input. The positioning accuracy of sorting arm improves, and the stabilization time is shortened
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