蒸汽机车的十字头和鞲鞴杆是以鞴鞴杆端部的一段锥体嵌入十字头锥孔内的形式,靠嵌入部的摩擦力来固定的。在需要拆检时,施以与嵌入方向相反的力,使鞲鞴杆从十字头锥孔中脱出。这种组装与分解作业历来是人力操作的,对嵌入力的大小亦较难作出规定,因此,考虑到安全,往往嵌入力偏大。这样,给分解作业又带来更大的麻烦。同时,鞲鞴杆的嵌入力是通过打入扁销的方法获得,这种方法不但劳动强度大,而且对嵌入部分的结合有不良的影响。近年来,不少机车工厂和机务段研制了一些机具,以代替人力进行鞲鞴杆、十字头的组装 The steam locomotive’s cross head and bar is based on a section of the bar at the end of the bar embedded in the cross-head taper hole and is fixed by the friction of the inserting portion. When disassembly is required, exert force opposite to the direction of insertion to disengage the tappet from the cross-head taper hole. This assembly and disassembly operation has always been human operation, the size of the embedding force is also more difficult to make provisions, therefore, taking into account security, embedding power is often too large. In this way, to decompose the job and bring more trouble. At the same time, the embedding force of the snare rod is obtained by the method of driving into the flat pin. This method not only has high labor intensity, but also adversely affects the bonding of the embedment part. In recent years, a lot of locomotive factories and locomotive depot developed a number of machines to replace the manpower to tap the pole, cross head assembly