Cause analysis of the shell fracture of marine hydraulic motor

Marine hydraulic motor system has the characteristics of simple structure, good low-speed performance, impact resistance and reliable operation, which is widely used in ship's winch (anchor). In the process of tugboat berthing, there are two main cases of rupture of the hydraulic motor shell of the winch.

1. Too fast. In the process of laying out the cable, the high-power tugboat adopts the combined operation of pushing and jacking in the process of assisting berthing, and the main cable is always tied to the large ship assisted. When pushing, the main cable is recovered; when towing away, the tugboat reverses, and the winch starts towing when it reaches a certain length (generally between 50-70m). In this way, during each berthing operation, the winch needs about 10 times of cable collection and laying. If it is necessary to change from jacking to towing, the tug will quickly reverse and the winch will quickly release the cable. When the reverse speed of the tug is greater than the cable laying speed of the winch, the hull of the marine hydraulic motor of the winch will break.

2. The brakes are slipping. When the tugboat is towing away, the towing cable is released, and the winch is in the braking state. The main cable is impacted by the shaking force of the hull due to the influence of wind and waves, or the buffering length of the towing cable tethered on the big wheel is less than the wave height when pushing. When the towing cable is affected by the weight of the ship, the stress on the cable is greater than the braking force, and the winch brake slips, causing the hull of the marine hydraulic motor to break.