| 摘要 |
<p>A chain block, comprising a lifting device; the lifting device comprises lifting sprocket wheels (131, 132) and a lifting chain (11); the lifting sprocket wheels (131, 132) comprise a large lifting sprocket wheel (131) and a small lifting sprocket wheel (132) differing in radius; the large lifting sprocket wheel (131) and the small lifting sprocket wheel (132) are coaxially disposed on a gear shaft (120) horizontally supported relative to the vertical lifting direction, and rotate synchronized with the gear shaft (120); the lifting chain (11) is an endless chain; after twining the bearing portion of the large lifting sprocket wheel (131), the lifting chain (11) has a suspended section (111) not contacting the large lifting sprocket wheel (131), and then continues to twine the bearing portion of the small lifting sprocket wheel (132), and finally return to the large lifting sprocket wheel (131) via the remaining loading section.</p> |
