C620型车床在我国机械工厂中数量很多,使用很广。我们在长期修理实践中,对以下十个方面作了改进。这些改进,在改善使用性能和减少机床故障,或在修理上都带来不少好处,技术经济效果亦佳。现介绍如下,供读者参考。一车头箱皮带轮卸荷座原结构见图1。皮带轮和卸荷座之间装有两个滚动轴承(213),用一个外隔套隔开。通过调整圆螺母(M56×1.5)的位置来消除轴承的轴向间隙,并施加预加载荷。在实际使用中,若轴承内环与座体配合过紧,皮带轮装卸很不方便;若配合较松,运转时轴承内环与座体会相对转动,而造成磨损。同时,圆螺母的调整全凭手转动皮带轮的轻重感觉来掌握,往往难以调整 C620 lathe in our country a large number of machinery factory, is widely used. In the long-term repair practice, we made improvements in the following ten aspects. These improvements have resulted in significant technical and economic benefits in terms of improving serviceability, reducing machine failures, or repairs. Now introduced as follows, for readers reference. A front box pulley unloading seat original structure shown in Figure 1. There are two rolling bearings (213) between the pulley and the unloading seat, separated by an outer spacer. By adjusting the position of the round nut (M56 × 1.5) to eliminate the bearing axial clearance, and impose preload. In actual use, if the bearing inner ring and the seat body are too tight, the loading and unloading of the pulley wheel is inconvenient; if the engagement is loose, the bearing inner ring and the seat body will rotate relative to each other and cause abrasion. At the same time, the adjustment of the round nut depends entirely on the feel of the weight of the pulley, which is often difficult to adjust