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[Asia pump network] grid voltage changes, the load changes, its own pressure fluctuations and flow pulsation can cause hydraulic pump noise and vibration. Fluctuations in the grid voltage cause pulsations in the hydraulic pump, causing the pump outlet and line pressure to fluctuate, which is caused by external causes of fluid flow and pressure fluctuations. Hydraulic pump hydraulic system noise and vibration and eliminate the pressure of the trapped oil zone impact, hydraulic pump can also generate fluid noise. Such as the swash plate directional piston pump, the cylinder in the process of rotation is located at the top dead center, the liquid pressure in the plunger chamber and drain chamber connected to the moment, the suction pressure suddenly rose to the discharge pressure, resulting Larger / K force impact. In the same way, pressure shocks also occur when they are located at the bottom dead center, and they are the main noise source of the liquid version of the pump. In order to ensure the required power and flow under the premise, try to choose low-speed hydraulic pump; also choose to use composite pump to improve the overflow Flow valve sensitivity, additional unloading Road, etc. to reduce noise. The cavitation of the screwed valve creates fluid noise. This is because the flow of oil through the valve produced by ☆ role in the throttle produce a high flow rate, pressure changes also change the flow, when the scoop pressure is below atmospheric pressure, the gas dissolved in the oil will be separated out a large amount of Bubbles, the noise frequency at this time will be high. In addition, in the jet state, the oil flow velocity is not uniform and eddy current occurs, or noise is generated due to the oil flow being cut off. The solution to this type of noise is to increase the dorsal torque on the downstream side of the throttle UI so that it is higher than the cut-off value of the air separation force. The multi-stage decompression method prevents cavitation. General oil flow through the throttle valve control valve, the pressure upstream and downstream side of the pressure ratio should be 3 ~ 6 = liquid torque pump pressure fluctuations so that the valve resonance, thereby increasing the noise. In the control valve, especially the throttle valve, the throttle opening is small, high velocity, easy to produce eddy currents, and sometimes spool the valve seat, vibration is very large: When this happens, you can use a small size control valve to replace, Or throttle large open. When the directional control valve is closed or opened, vibration and noise will be caused by hydraulic shock. Such as electromagnetic valve quickly switch. Hydraulic impact will lead to violent fluctuations in the internal control of the pipe, and spread along the pipeline, when passed to the hydraulic pump and cylinder, it will make these links produce vibration and noise. Reduce such vibration and noise, should be reasonable through the valve and piping settings, to minimize hydraulic shock. Liquid m pump suction phenomenon, refers to the oil pump sucked into the air or sucked into the oil mixed with air = This phenomenon not only affects the quality of oil, increasing noise, but also affect the liquid m pump volumetric efficiency, hydraulic System is not allowed to happen. The main reason for this phenomenon is that the fuel tank and oil absorption are not set properly. To prevent this phenomenon, the following measures should be taken. Separated long tank, divided into return tank and suction tank. Must be people oil pool 3/5 depth. Head to be strictly sealed to prevent short-term suction into the air pump. The relevant settings should be regularly cleaned to prevent clogging. Mechanical Components in Hydraulic System Due to Vibration Due to Vibration Hydraulic system due to design, manufacture, installation and other errors, the work of the relevant parts will produce vibration and output noise, attenuator and isolation can be used to eliminate or reduce such noise. (Attenuator is used to prevent the diffusion of noise, Attenuator has absorption type and reflection type.) The rational arrangement of the pipeline and the setting of the accumulator in the pipeline can attenuate the periodic vibration in the system. Device, you can eliminate the noise generated by the system seat force fluctuations. (Editor: Huang Nengwen QQ:)