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在齿轮齿条驱动的施工升降机中,一般均装有平衡重,用来平衡梯笼的重量,以减少主电机输出之功率,节省能源。同时,也改善了导轨架的受力状态,提高了施工升降机运行的平稳性。图1为平衡重的安装位置,也就是平衡重5与天轮1、天轮架2、梯笼4、导轨架6之间的装配关系。从图1可以看出,平衡重5与梯笼4两者通过钢丝绳3悬挂在天轮1的绳槽两侧,两者重量的一部分可以得到平衡,而天轮所受的支反力可通过天轮架2和导轨架6传递到升降机下部的底架和地基,受力比较合理。平衡重的重量G_3可由下式确定: G_3=G_2+фG_1(kN) (1)式中 G_1———梯笼有效额定载荷(kN) G_2——梯笼自重(kN)
In construction hoists driven by a rack and pinion, balance weights are generally installed to balance the weight of the ladder cages so as to reduce the output power of the main motor and save energy. At the same time, the stress state of the guide rail frame is also improved, and the smoothness of the construction elevator operation is improved. FIG. 1 shows the installation position of the counterweight, ie the assembly relationship between the counterweight 5 and the sky wheel 1, the wheel carrier 2, the cage 4 and the guide rail frame 6. As can be seen from FIG. 1, both the balance weight 5 and the cage 4 are suspended on both sides of the rope groove of the sky wheel 1 by the wire rope 3. A part of the weight of the two wheels can be balanced, and the counterweight of the sky wheel can be passed. The wheel carrier 2 and the guide rail frame 6 are transmitted to the bottom frame and foundation of the lower part of the elevator, and the force is relatively reasonable. The weight G_3 of the counterweight can be determined by the following formula: G_3=G_2+фG_1(kN) (1) where G_1—the effective cage load rating (kN) G_2—the cage weight (kN)