Design of Lifting Table for Fiber Laser Cutting Machine
With the popularization of fiber laser cutting machine technology applications in recent years, people have put forward higher requirements for the processing efficiency of fiber laser cutting machines. At present, most fiber laser cutting machines adopt double-layer exchange lifting workbench. When one layer of the double-layer workbench is processed in the processing area, the loading and unloading work can be completed on the other workbench. The exchange of workbenches can reduce the waiting time of loading and unloading, which greatly improves the working efficiency of the equipment. At present, most of the lifting tables are hydraulically driven, and the four corners of the lifting platform are driven by hydraulic cylinders to realize the up and down movement of the lifting platform. There are some shortcomings in the actual use of hydraulic lifting workbenches: ①Poor synchronization, especially when there is an unbalanced load, the problem of non-synchronization is more serious; ②The cost is high, and a special hydraulic station is required to provide hydraulic oil; ③The running stability is not stable. Good, there will be a big impact when starting and stopping; ④The positioning accuracy is not high, and the position deviation of the upper and lower limit points is relatively large.
In the research and development project of a linear motor-driven CNC fiber laser cutting machine, a mechanical lifting table based on an eccentric wheel mechanism was designed, and its motion law was simulated by the multi-body dynamics software ADAMS. The technical solution has many advantages such as simple structure, low cost, safety and stability, accurate positioning and so on.
The lifting table of the fiber laser cutting machine is somewhat different from other industrial lifting tables: ①The stroke is fixed, and the position of the upper and lower limit points is required to be accurate; ②The process of starting and stopping is smooth and without impact; ③Partial load Under the circumstances, the synchronization of the lifting action is ensured. The mechanical lifting table designed in this paper uses 4 rigidly connected eccentric wheel mechanisms as the driving mechanism. Its kinematics is very suitable for the lifting table of the fiber laser cutting machine. The specific structure, the lifting table mainly includes a frame, a U Type bracket, worktable A, worktable B, synchronous shaft, drive gear, eccentric gear, reducer, motor and other parts. There are guiding devices on the frame, rollers with guiding grooves on the workbenches A and B, upper and lower guide rails on the U-shaped bracket, bearing seats on the lower part of the U-shaped bracket, and the eccentric There is an eccentric shaft. The motor is an ordinary AC asynchronous motor with brake. After the drive motor is decelerated by the reducer, the eccentric gear is driven by the drive gear to rotate. The eccentric shaft drives the U-shaped bracket to move in the circumferential direction through the hinged joint of the bearing seat, thereby realizing the worktable on the U-shaped bracket The lifting movement. During the lifting process. The workbench is restricted by the guiding device. Can only do up and down movements. When the U-shaped bracket moves in the circumferential direction around the axis of the eccentric gear, the rollers on the worktable roll on the guide rails on the U-shaped bracket. In addition, the two eccentric gears on the same side are rigidly connected by a U-shaped bracket, and the two eccentric gears on both sides driven by the same reduction motor are rigidly connected by a synchronization shaft to realize the rigid connection of the 4 eccentric gears. This ensures the synchronization of the four eccentric wheels during the lifting process.