Hydraulic transmission Compared with gear transmission, it is a new kind of technology, which uses liquid as the operating medium to complete the transmission of energy. It changes the mechanical kinetic energy of the prime mover (motor, etc.) into the hydraulic energy of the liquid according to the energy conversion equipment (hydraulic pump), and closes pipes, control elements, etc. according to the information, and passes through another energy conversion equipment (hydraulic cylinder, Hydraulic motor ）The hydraulic energy of special liquid (usually engine oil) is replaced by mechanical kinetic energy to promote self loading and complete the operation required by the actuator - linear motion or rotational operation. Compared with gear transmission, the hydraulic transmission of GM4-7500R40 cabin opener is characterized by compact structure, stable transmission, large output power, and easy to complete automatic control of no trigger speed change, for example; As a hydraulic lifting conveyor Low speed high torque hydraulic motor At the same time, it is connected with the cargo overturning, and there is no reduction gearbox. The hydraulic station is composed of motor, hydraulic oil pump, pipeline, main valve and oil tank to supply power oil, Hydraulic transmission device It has good speed change performance, stable operation, convenient reversing, light overall weight, small size, and can absorb impact load to alleviate noise, and can avoid overload by itself. Because of this, hydraulic transmission system can be widely used in ships (such as submarine of South China Sea Fleet). It is mainly used in; Control the rudder, the bow and the tail, level the rudder, change the operating position of the submarine} Control the adjustment of all kinds of adjustment equipment (sight glass, vent tube radar and radio antenna adjustment equipment), open and close all kinds of "doors" outside the boat (open to the sea, open to the air, open to the air, open to the air, open to the air, open to the air, open to the air, open to the air, open to the air, open to the air, open to the air , open and close the front cover of the torpedo launching tube, the missile launching cover, and even the sending torpedo. The ship's hydraulic transmission device is a sealing loop system composed of the motor's hydraulic components (pumps, actuators, control valves, auxiliary parts, etc.) and engine oil. In the sealing loop container, the engine oil in the running state causes liquid noise due to the pulse, and at the same time, it is transmitted to the solid wall of the container to cause co vibration, Generation=secondary solid sound is transmitted to the air. Because of the difference in the operating status of hydraulic devices, it will cause transient noise or continuous noise, which is caused by a variety of sources. Specifically, it is the noise caused by the motor, various hydraulic components, and the oil tank, pipe joint and assembly bracket, The noise caused by basically equal vibration is praised together. According to the actual investigation, the (hydraulic) oil pump and hydraulic control are the key noise sources in the hydraulic device, while the oil tank is the key radiation of noise due to its large range. The oil tank, pipeline, etc. may further expand the noise caused by the hydraulic oil pump.

Therefore, in the process of noise control, we should consider the actual evidence from the two aspects of noise control noise and the noise caused by the vibration of the device, and control our own noise only by reducing the noise, Although it is beneficial to reduce the noise of GM2-3500R24 hatch cover hydraulic transmission device, sometimes it is not as good as the actual effect obtained from the use of anti vibration and noise reduction measures for the hydraulic transmission device. It is obvious that the hydraulic pump is the primary noise source of the hydraulic device, which is mainly formed by electromagnetic rotary noise, such as fluid noise, high-frequency vibration noise, and destructive noise, Electromagnetic noise and rotary impact noise, etc. The noise control of hydraulic transmission device not only focuses on the source of noise, but also controls the spread of noise, that is, noise isolation, sound absorption and silencing. The methods for noise control of hydraulic transmission device are as follows:

1. Reduce flutter force

(1) Low noise motor for military use.

(2) The following measures shall be taken to improve the hydraulic pump, vane pump, gear pump and piston pump to reduce the noise by 5~10 dB (A)

(3) Enlarge the wall thickness of the hood

(4) Improve the shape of the pressure oil port groove in the rolling part

(5) Improve timing of oil suction and pressure

(6) Improve oil suction mechanism

2. Ship power communication

(1) Install the silencer on the cuff soil

(2) And increase the width of the teeth) to improve the tooth color,

(3) Select bearings

(4) Change the rolling part of the piston and the shape of the quinquinone plate,

(5) Tongue J at the tip of turning blade

(6) Improve the specification precision and surface smoothness of spare parts

3. Use the following measures to improve the overflow valve, and the noise can be reduced by 5~10dB (A) during pressure reduction

(1) Increase the shell wall thickness,

(2) Change the lifting amount of the main piston,

(3) Avoid abnormal sound (noise) caused by needle valve vibration

(4) Avoid resonance of spring

(5) Try to improve the smoothness of the surface layer of the overflow inner casting (the smoother the better)