Chain hoist components should meet the criteria

1,  load chain shall comply with GB 4829 and GB 5802 regulations.
2, the hook should be consistent with the provisions JB 4207. Hook should be installed under the provisions comply with ZB J80004 mouth hook locking device. Should be able to hook in the horizontal plane of rotation of 360.
3, tail ring  Chain Block  limiting device must be installed and should be able to meet the following requirements: When the chain hoist in a no load condition, the hand chain drop side tension is applied to 2.5 times the rated hand, the machine should be able to reliably to withstand, without breakage.
4, chain hoists chain guide should configure the appropriate device and file chains, the chain and sprocket engages properly play a supporting role, but also in.
5,  manual hoist  unattended and shaking, make sure the chain may come off from the sprocket ring groove.
6, Z-level chain hoists lifting sprocket and cruises must have suitable rolling bearings.
7, brakes, gears should be equipped with proper guards against dust, dirt from entering.
8, the brake is a friction plate, consisting of the pawl and ratchet mechanical brake, when to stop pulling the hand chain, should be able to stop immediately and a reliable prop lifting loads.