1. Rotating positioning of polarizer
The turntable of the polarizing polarizer is rotated, and the clearance motion mechanism composed of incomplete gear and rack is completed. In the design, multi station turntable is adopted to improve the machining efficiency. The specific rotation structure is shown in Fig. 4, which is composed of a driving motor, six incomplete gears and a rack. A six axis linkage mode is adopted to realize the polarizer rotation of the six working stations. According to the process requirements, the six stations only need to rotate 90 degrees synchronously. The polarizer can be machined. The precise positioning of the turntable is completed by the fixed block limit and the cylinder locking structure. In design, the cylinder is used to lock the dowel pin.
In the work process, driven by the motor drive gear and rack mechanism, driven by the rotating shaft through the rotary table, and the table columns to transmit power to the polarizer, so as to drive the rotating polarizer.
The polarizer in a compressed state, a cuboid stack polarizer to form a rigid body, mutual friction between layers is transferred to nylon pad on the table, on the table, the rotating assembly square column and T block so as to complete the whole stack of co rotating polarizer rotation.
When the rotating mechanism is out of the meshing position to complete the rotation, the cylinder extends out and locks the T block which rotates with the turntable to complete the positioning of the upper and lower turntable. Reduce the manufacturing accuracy requirements of the transmission parts. But in the process of polarizer rotation, because of the friction torque, the polarizer between the upper and lower layers will stagger up and down and can not be processed. This need to solve the problem of synchronous rotation on the table.
2. Up and down synchronous rotation of polarizer
The surface of polarizer is very smooth, and the friction factor is small. The friction torque between the layers is smaller than that of the small size polarizer under the same pressure. When the polarizer rotates, the friction torque between the upper and lower layers is not enough to drive the upper rotation synchronously. There is a great deal of non synchronization, resulting in the slip between the polarizer layer and the layer, resulting in the failure of the stacked polarizer to complete the rotation, and more difficult to ensure the grinding accuracy. And the small non synchronization will be restored after the polarizer rotates, depending on the elastic between each other.
Taking full consideration of these conditions, it is only possible to produce tiny non synchronization of the polarizer when the polarizer rotates. Therefore, the auxiliary rotary tooling U fork is designed as shown in Figure 5, and there is a certain gap between the U shaped fork and the upper and lower square columns, which ensures the synchronous rotation between the polarizer and the upper and lower parts, and is convenient for practical operation. Lower platen rotates, the torque to the upper platen by U type fork, the lower platen can rotate synchronously, realize the whole stack of polarizer rotation. To solve the slip between the upper and lower platen synchronization caused by the rotation of the polarizer layers.
1.3 Measures to improve production efficiency
In addition to multi station design to improve the production efficiency, we design the C type material box, as shown in Figure 6, to further improve the efficiency, shorten the charging time to fast loading and initial positioning function, and ensure each stack of polarizing film thickness is basically the same, a material box can be used at the same time, in order to save time. The operation of the process, the process of the processing equipment, the polarization is arranged in the material box, to prepare for the next grinding. The design of the material box mainly considers the easy operation and the wear resistance of the material, and considers the cutting allowance and safety margin of the polarizer.