The speed fluctuation of four column Hydraulic Press can be divided into periodic speed fluctuation and aperiodic speed fluctuation. The operation of the four column hydraulic press depends on the work done by the external force on the system.
If the work done by the driving force is equal to the work done by the impedance force in each period of time, the member will move at a uniform speed. However, when many machines are working, the work done by the driving force is not equal to the work done by the resistance for a certain period of time. When the driving work is greater than the impedance work, the surplus work occurs and the kinetic energy of the machine increases; When the driving work is less than the impedance work, the power loss occurs and the kinetic energy of the machine decreases. The increase or decrease of kinetic energy will lead to the fluctuation of mechanical motion speed. The fluctuation of mechanical motion speed will cause additional pressure in the motion pair and reduce the efficiency, service life and work quality of the machine.
Therefore, certain measures should be taken to limit the speed fluctuation within a certain range.
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