Use of ship deck machinery Hydraulic transmission It has a history of nearly one hundred years. With the development trend of hydraulic technology, hydraulic transmission has been further applied to other aspects of ship machinery and equipment, such as ship white steering, ship fin stabilizer and variable pitch propeller propulsion system regulation mechanism. If such Hydraulic transmission device Any abnormality will seriously affect the shipping manufacturing and increase the operating expenses of shipping companies. According to insufficient summary, nearly 30% of the problems in the hydraulic system are caused by the seawater pump Hydraulic motor Caused by. Therefore, it is of key practical significance to find out the types of problems and the regularity of problems of the seawater pump hydraulic motor for fault detection and maintenance of the ship hydraulic transmission system. The common problems and maintenance and replacement problems of marine seawater pump hydraulic motor are discussed below.

2 Common problems and maintenance strategies of marine seawater pump hydraulic motor

Different working conditions require different seawater pump hydraulic motors for hydraulic transmission machinery and equipment. Several types of commonly used marine low-speed and high torque seawater pump hydraulic motors and key technical parameters are detailed as follows. Among them, the single acting radial plunger sea water pump hydraulic motor has a simple structure and is suitable for places where the low speed stability requirements are not high; The double swashplate axial plunger sea water pump hydraulic motor has a wide speed range and excellent low speed stability. When the sea water pump hydraulic motor is required to output large torque and has excellent low speed stability, the internal curve multi acting radial plunger sea water pump hydraulic motor is generally used. The seawater pump hydraulic motor of the hydraulic transmission system shall operate stably without abnormal noise during normal use, otherwise it will forebode bad changes in the installation of equipment or defects in the stator, blade or spring and other parts in the motor. The marine seawater pump hydraulic motor is prone to various problems after being used for a while due to its hard working environment and heavy load. There are various expressions of such problems. Low speed stability deterioration (destruction) is the most common problem of marine seawater pump hydraulic motor, and most of its occurrence factors are caused by environmental pollution of hydraulic oil. The working task of the ship's hydraulic system is very severe, and various sundries are easily mixed into the hydraulic oil, so that the parts of the seawater pump hydraulic motor are destroyed too early, and the oil leakage increases irregularly, resulting in a significant reduction in the low speed stability of the seawater pump hydraulic motor. The environmental pollution of hydraulic oil is a great damage to the overall hydraulic system. It destroys the hydraulic pump, and makes the oil supply volume and pressure pulse out of order, which also causes the deterioration of the low speed and stability of the seawater pump hydraulic motor. Anti pollution and cleaning of hydraulic oil is a task that must be paid special attention to in the ship hydraulic system. In addition, the use of the seawater pump hydraulic motor - after a while, the return oil pressure of the original setting value decreases, which may also change the low-speed stability of the motor. For this reason, the return oil pressure can be adjusted and effective return oil back pressure can be adopted.