在矿山设备维修中,当装、拆相互配合的零部件和校正变形零件的时候,常常使用简单实用的螺旋省力工具。但通常的单螺杆省力工具一人操作时,产生的轴向力不超过10吨。在许多场合,需要设计制作吨位较高的组合式螺旋省力工具。(一)螺杆的设计计算组合式螺旋省力工具的基本元件是螺旋副,一般应优先选用粗牙梯形螺纹。图1为常见的螺杆组装形式。 In the mine equipment maintenance, when loading and unloading the components and the deformation of the deformation of the correct parts, often using simple and practical helical effort tools. However, the usual single-screw effort tool when one person operating, the resulting axial force does not exceed 10 tons. On many occasions, it is necessary to design and manufacture high-tonnage screw-down tools. (A) Design and calculation of the screw The basic components of the combined helical effort tool is the helix, generally should be preferred coarse tooth trapezoidal thread. Figure 1 is a common form of screw assembly.