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全苏起重运输机械研究所设计的T型电动葫芦的起升机构大多数都装有载荷自制式制动器,这制动器在下降时起作用,也就是起影响载荷下降速度的作用。下面探讨定量评定这一影响的方法。T型电动葫芦载荷自制式制动器的典型结构(图1)包括螺杆以及与螺杆刚性固定在一起的制动盘、螺母、棘轮和棘爪。螺杆同时也是起升机构减速器的中间龆轮轴,而螺母又是它的第一级齿轮。在起升载荷的作用下,与载荷运动相连系的螺杆被迫相对于与电动机相连系的螺母转动。这时端面制动盘与螺母把棘轮压在中间。棘爪不阻止棘轮往起升载荷方向
Most of the hoisting mechanisms of T electric hoist designed by the Institute of Crane Transport of Jiangsu are equipped with load self-made brakes, which work when descending, that is, they influence the rate of load descent. Here’s how to quantify this effect. The typical structure of a T-type electric hoist load self-made brake (Figure 1) consists of a threaded rod and a brake disc, nut, ratchet and pawl that are rigidly attached to the threaded rod. The screw is also the middle of the hoisting gear reducer, and the nut is its first gear. Under the lifting load, the screw associated with the load movement is forced to rotate relative to the nut associated with the motor. At this time end face disc and nut ratchet pressure in the middle. The pawl does not stop the ratchet from lifting the load direction