G72型弓锯机用于锯割φ200毫米以下的棒料,在使用中噪音大,经常发生打齿、烧轴的现象.为此,我们对该机床进行了一些改进。一、原传动系统存在的问题如图1所示,该机床主传动系统为悬臂轴开式齿轮传动.曲柄轴Ⅱ有两种转速。第一种75转/分:顺时针方向旋转结合子5,使齿轮4与6啮合;并把连接块8从齿轮7的槽中拉出,固定于齿轮6的轮幅槽中,使齿轮6与7相脱离.电机轴的转动经齿轮1、2、4、6传至Ⅱ轴.第二种97转/分:逆时针方向旋转结合子5,使齿轮4与6不啮合; G72 sawing machine is used to saw the bar below φ200 mm, in use, it is noisy, and the phenomenon of punching and burning the shaft often occurs. Therefore, we made some improvements to the machine. First, the original drive system problems As shown in Figure 1, the main transmission system for the cantilevered shaft open gear drive crankshaft Ⅱ has two kinds of speed. The first 75 rev / min: clockwise rotation of the combiner 5, so that the gear 4 and 6 mesh; and the connection block 8 pulled out from the gear 7 of the groove, fixed to the gear 6 of the groove, so that the gear 6 And 7 phase separation. Motor shaft rotation through the gear 1,2,4,6 transmitted to the shaft. The second 97 rev / min: counterclockwise rotation of the combiner 5, the gear 4 and 6 do not mesh;