These are reels equipped with wire rope (non-electrical cables) to provide spring assistance to the lifting of heavy items such as power tools, looped cables, and other loads.
这些轴中都安装了钢丝绳（无电缆），帮助提升重型设备，比如电力工具，环形电缆和其他的荷载。
2
Spring Balancer is a kind of lifting gear.
弹簧平衡器是起重工具的一种。
3
The movable device mainly consists of the nut, bolt, lifting wedge, backseat, supporting seat of the clamp plate, spring and pressure plate and so on.