Hydraulic machine vibrations include forced vibration and self-excited vibration. For the hydraulic system of the hydraulic press, the forced vibration of the hydraulic machine comes from the unbalanced force of the high-speed moving parts such as the motor, the hydraulic pump and the hydraulic motor, and the commutation shock of the hydraulic cylinder, the pressure valve, the reversing valve and the flow valve. The pulsation of force and flow pressure. Hydraulic machine vibrations include forced vibration and self-excited vibration. For the hydraulic system of the hydraulic press, the forced vibration of the hydraulic machine comes from the unbalanced force of the high-speed moving parts such as the motor, the hydraulic pump and the hydraulic motor, and the commutation shock of the hydraulic cylinder, the pressure valve, the reversing valve and the flow valve. The pulsation of force and flow pressure. In the forced vibration of the hydraulic machine, the alternating force of the hydraulic machine to maintain the vibration and the vibration (including the resonance) may be non-coherent, that is, when the vibration is stopped, the alternating force of the motion still exists.
The self-excited vibration of the hydraulic machine is also called flutter, which is generated during the movement of the hydraulic machine. It is not caused by the forced vibration energy, but by the hydraulic pressure, flow, force and quality of the hydraulic transmission of the hydraulic machine. The interaction of parameters is generated. Jinjitong reminds that no matter how severe this vibration is, as long as the movement (such as machining cutting motion) stops, it disappears immediately. For example, the self-excited vibration often generated by the servo spool valve is the interaction between the axial hydraulic power of the spool valve and the pipeline.
In addition, the vibration of numerous elastomers in the hydraulic system of a hydraulic machine may cause vibration of a single component, and may also cause resonance of two or more components. The reason why the hydraulic machines generate resonance is that their vibration frequencies are the same or similar, and the amplitude increases when the hydraulic machine resonates.
The vibration and noise of the hydraulic machine is one of the common faults of the hydraulic equipment. The two are often twin brothers, which usually appear at the same time.
The vibration and noise of the hydraulic machine are the following hazards.
The vibration and noise of the hydraulic machine affect the surface quality of the machined parts, which deteriorates the machine's working performance.
The vibration and noise of the hydraulic machine affect the working efficiency of the hydraulic equipment, because the cutting speed and the amount of cutting have to be reduced in order to avoid vibration.
The vibration and noise of the hydraulic machine are intensified, causing the pipe joints to loosen, causing oil leakage and even damaging the equipment, resulting in equipment and personal accidents.
The noise of hydraulic press is one of the important factors of environmental pollution. Noise makes the brain fatigue, affects hearing, accelerates heart beat, and causes harm to people's physical and mental health.
The vibration and noise of the hydraulic machine flood the dangerous signal and the command signal, causing work accidents.
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