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一、国内概况目前国内生产的小车变幅塔式起重机大都采用两段力矩控制法。现以QT25塔式起重机为例(见图1);用装在A处的起重量限制器
First, the domestic profile At present, the domestic production of variable-speed tower crane mostly uses two sections of torque control method. QT25 tower crane is now an example (see Figure 1); installed in A Department of the weight limiter