Use of ship deck machinery Hydraulic transmission It has a history of nearly one hundred years. With the development of hydraulic technology, hydraulic transmission is further applied to other aspects of ship equipment, such as ship automatic steering, ship fin stabilizer and variable pitch propeller propulsion system adjustment mechanism Hydraulic transmission device The failure will seriously affect the production of ship transportation and increase the operating costs of ship transportation companies. According to incomplete statistics, nearly 30% of hydraulic system failures are caused by Hydraulic motor Caused by the failure of. Therefore, it is of great significance for fault diagnosis and maintenance of marine hydraulic transmission system to understand the fault types and fault occurrence rules of hydraulic motors. Next Marine hydraulic motor To discuss common fault problems.

Common faults of marine hydraulic motor

Different working conditions require different hydraulic motors for hydraulic transmission equipment. Among them, single acting radial plunger Marine winch hydraulic motor The structure is simple and suitable for occasions where low speed stability is not required; Double swashplate Axial plunger hydraulic motor It has a wide speed range and good low-speed stability. When the hydraulic motor is required to output large torque and have good low-speed stability, the internal curve multi action is generally adopted Radial plunger hydraulic motor 。

The hydraulic motor of the hydraulic transmission system shall operate stably without abnormal sound during normal use, otherwise it indicates that the equipment installation conditions have bad changes or the stator, blade or spring and other parts in the motor have defects. Marine hydraulic motors are prone to various failures after a period of use due to the harsh working environment and heavy load. These faults have various manifestations. Low speed stability deterioration (wear and tear) is the most common fault of marine hydraulic motors, and most of its causes are caused by hydraulic oil pollution. The working conditions of marine hydraulic systems are very poor, and various impurities are easily mixed into the hydraulic oil, which makes marine hydraulic motors Cycloid hydraulic motor The premature wear of parts and the irregular increase of oil leakage result in a sharp decline in the low speed stability of the hydraulic motor. The hydraulic oil pollution is a great hazard to the entire hydraulic system. It damages the hydraulic pump, makes the oil supply quantity and pressure appear disorderly pulsation, and also causes the deterioration of the low-speed stability of the hydraulic motor. The anti pollution and cleaning treatment of hydraulic oil is a work that must be paid special attention to in the ship's hydraulic system. In addition, after the hydraulic motor has been used for a period of time, the originally set return oil pressure will become smaller, which may also change the low-speed stability of the motor. Therefore, the return oil pressure can be adjusted to select a reasonable return oil back pressure.

        Marine external five star hydraulic motor After using for a period of time, the noise increases significantly, mainly because the motor operates under high load conditions for a long time, and the lubrication conditions are not well guaranteed, which leads to wear of bearings, couplings and other moving parts of some components of the relative motion part of the machine, resulting in errors in component matching. In addition, the hydraulic impact of the system and the phenomenon of hydraulic oil cavitation are also important factors that cause the increase of hydraulic motor noise. In fact, there are many reasons for various faults in the hydraulic system. The working conditions of various components and accessories of the hydraulic system restrict and influence each other, and even the length, thickness, direction and distribution of the pipeline are closely related to this. Taking the decrease of output torque of hydraulic motor caused by insufficient oil supply as an example, it may also be related to the failure of electronic control circuit of solenoid valve and other components.