手扳葫芦是通过人力手动扳动手柄借助杠杆原理获得与负载相匹配的直线牵引力，轮换地作用于机芯内负载的一个钳体，带动负载运行。它具有结构紧凑、重量轻、外形尺寸小、携带方便省力、安全可靠、使用寿命长、手扳力小、对钢丝绳磨损小等优点。它可以进行提升、牵引、下降、校准等作业。若配置特殊装置，不但可以作非直线牵引作业，且可以很方便的选择合适的操作位置，或以较小吨位的机具成倍地扩大其负载能力，对于较大吨位负载可以采用数个机具并列作业
The wrench hoist obtains the linear traction force matching the load by manual pulling the handle with the help of lever principle, and acts on a clamp body of the load in the machine core in turn to drive the load to run. The utility model has the advantages of compact structure, light weight, small size, convenient carrying, labor saving, safety and reliability, long service life, small spanner force, and small wear and tear to the steel wire rope. It can carry out lifting, traction, descent, calibration and other operations. If equipped with special devices, not only non-linear traction operation can be done, but also suitable operation position can be conveniently selected, or the load capacity of smaller tonnage machines can be multiplied. For larger tonnage loads, several machines can be used in parallel operation.