(一)我国目前生产的缠绕式提升机卷筒都不设支环。支环会带来工艺上的不便,这是人所共知的。支环到底有什么好处?讨论得似乎不够充分,让我们先来看一个例子。以[1]中的124题的数据为例筒壳半径a=1900毫米,壳厚h=20毫米,筒宽l=1800毫米。作用于自由筒壳区的均布载荷q=14.3公斤/厘米~2,作用于支环附近的均布载荷为q′=16.1公斤/厘米~2。支环尺寸:宽×高=3.8×12.4=47.2厘米~2。支环处筒壳应力为1118公斤/厘米~2。此时筒壳与支环共需材料的体积为:π×2×190×2.0×180+π(2×190-2 (A) There is no branch ring in the winding hoist reel currently produced in our country. It is well-known that bracelets will bring about technical inconveniences. What are the benefits of the branch ring? The discussion seems inadequate, let us first look at an example. Taking the data of 124 questions in [1] as an example, the shell radius a = 1900 mm, the shell thickness h = 20 mm and the tube width l = 1800 mm. The uniform load q = 14.3 kg / cm ~ 2 acting on the free shell area is q ’= 16.1 kg / cm ~ 2. Branch ring size: width × height = 3.8 × 12.4 = 47.2 cm ~ 2. Branch ring office shell stress 1118 kg / cm ~ 2. At this point the total volume of material required by the shell and the branch ring is: π × 2 × 190 × 2.0 × 180 + π (2 × 190-2