Device for detecting bidirectional rotation angle by using encoder

The utility model provides a device for detecting a bidirectional rotation angle by using an encoder. The device comprises a driven shaft, a sampling gear which is assembled on the driven shaft and is meshed with a large gear of a rotation mechanism of equipment, and the encoder which is assembled on the driven shaft, the spring pretension force effect is formed among the multiple layers of gears to form pretightening torque, so that the double-layer gear generates an outward expansion movement trend, the two sides of the tooth form are completely attached to a large gear of a rotating mechanism of equipment, and when the rotating direction is changed, the double-layer gear structure can ensure that the sampling gear is synchronous with the large gear of the rotating mechanism of the equipment. Therefore, the influence of the meshing clearance on angle positioning detection is eliminated. 本实用新型提供一种利用编码器进行双向旋转角度检测的装置，包括：从动轴，装配在从动轴上且与设备的旋转机构大齿轮互相啮合的采样齿轮和与装配在从动轴上的编码器；多层齿轮间有弹簧预拉力作用，形成预紧力矩，使该双层齿轮产生外张的运动趋势，进而使齿形两侧完