How to solve the problem of loose steel connecting sleeves, we have 4 solutions.
The first way is to rive the punch lock. After tightening using red spots, welding, bonding, etc., the lost motion function of the thread pair can not be removed and connected to the connection. The disadvantage of this method is that it is very difficult to use only once, bolts and removals, you must destroy the detachable bolts of the secondary side.
The second way is to build a lock. The structure is a twin screw, ie a downward thread locking mode.
The third is friction lock. This is the most widely used as a locking device, in such a way that it does not generate a pair of friction screws that can be prevented from relative rotation between a pair of threads with a constantly changing external positive pressure. This positive pressure is achieved by two secondary axial or simultaneous clamping screws. If using elastic washers, steel connecting sleeves, self-locking nuts, nylon lock nuts, etc. This means that the removal of the lock nut is convenient, but in the case of impact, vibration and variable load, the preload of the bolt is reduced due to the looseness, the vibration frequency is increased, the loss of the preload is gradually increased, and the nut will eventually loosen. ,Connection failed.
The fourth method is a mechanical lock. The plug directly limits the opposite rotating screw pair. Such as the use of open ends, washer chain lines and so on. Since the plug does not pre-tighten the nut loosening back to lock the brake position the plug works, so this practice does not actually lock to prevent loss.