Precision rotation positioning platform based on compliant mechanism

[0012] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings of the specification:

[0013] As shown in Fig. 1, the precision rotary positioning platform based on the compliance mechanism includes a base 1, a movement platform 3, a guide mechanism 2 and two sets of driving devices. Among the two sets of driving devices, one group is composed of a telescopic brake 4, a fixed part 5, two balls 7, 9 and a spring 8. The other group is composed of a telescopic brake 10, a fixed part 11, two balls 13, 15 and a spring 14. composition. A circular hole is provided on the two opposite sides of the base 1, as shown in the figure, the circular hole 6 and the circular hole 12, which are used to install two sets of driving devices; the two sets of driving devices are distributed on the two opposite sides of the moving platform 3, and Dislocation distribution; in one of the driving devices, the two balls 7, 9 and the spring 8 are all installed in the round hole 6; the telescopic brake 4 is fixed on the base 1 by the fixing member 5, and the front end of the telescopic brake 4 is pressed against the ball 7, the ball 7 is compressed on the spring 8, the spring 8 is compressed on the ball 9, and the ball 9 is compressed on the moving platform 3. In another set of driving devices, the two balls 13, 15 and the spring 14 are all installed on In the round hole 12; the telescopic brake 10 is fixed on the base 1 by the fixing member 11, the front end of the telescopic brake 10 is pressed on the ball 13, the ball 13 is pressed on the spring 14, the spring 14 is pressed on the ball 15, the ball 15 is pressed on the movement platform 3.

[0014] The input of the entire platform is completed by the telescopic brake 4 and the telescopic brake 10. The input of the telescopic brake 4 drives the ball 7 to slide. The ball 7 compresses the spring 8 during the sliding process. After the spring 8 is compressed, the pressure is transmitted to the ball 9, and the ball 9 directly pushes the moving platform 3 to rotate. The input process of the telescopic brake 10 and the input process of the telescopic brake 4 are exactly the same. When the input of the telescopic brake 10 and the input of the telescopic brake 4 are the same, the moving platform 3 is subjected to two driving forces of the same size, opposite directions and symmetrical along the center of the platform, so as to generate a rotational movement.

[0015] The balls 7, 9, 13, 15 in Fig. 1 can be replaced by the cylinder in Fig. 2, and the functions of the balls and the cylinder are exactly the same.

[0016] Since the stiffness of the spring 8, the spring 14 and the guide mechanism 2 are quite different, when the telescopic brake 4 has an input, the moving distances of the ball 7 and the ball 9 are completely different. The greater the difference in stiffness between the spring 8, the spring 14 and the guide mechanism 2, the greater the difference in the movement distances of the ball 7 and the ball 9. The main reason is that the spring 8 will be shortened after being pressed, and the input displacement of the telescopic brake 4 will be mostly lost. In the compression deformation of the spring 8, the effective displacement transmitted to the ball 9 and the moving platform 3 is greatly reduced. At the same time, this also reduces the input displacement deviation of the telescopic brake 4 correspondingly, that is, the positioning accuracy of the platform is greatly improved. Since the displacement accuracy of the telescopic brake 4 is constant, the greater the difference between the movement distance of the ball 7 and the ball 9, the higher the positioning accuracy of the platform. Through this mechanism, a low-precision, low-cost driving device can obtain high-precision output, greatly reducing the cost of the platform, enhancing the universal type of the platform, and having good practical value.