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如果将ＱＴ６０／８０塔机的变幅方式由动臂变幅改为水平臂架牵引小车式变幅，而经费又要少投入，最佳的办法是对原臂架进行改造，以满足水平臂架小车变幅的需要。改造中首先遇到的问题就是改造后臂架的支承形式及吊点位置的确定。臂架的支承有两种形式，如图１所示。图１...
If the QT60 / 80 tower crane luffing range from boom luffing to horizontal boom drag trolley-style luffing, and less funding into the best way is to transform the original boom to meet the level of the arm Carriage luffing needs. The first problem encountered in the transformation is the support form of the rear boom and the determination of the hanging point. Boom support in two forms, as shown in Figure 1. Figure 1 ...