The hydraulic system of the four column hydraulic press is mostly seen in the closed-loop control system software. It is necessary to consider the reliability, response speed and precision of the hydraulic press system software. First, how to install the hydraulic system well. Raw materials or architectural coatings in the tank can not become pollutants of hydraulic oil, so the automobile oil tank of hydraulic system is made of metal; Secondly, the hydraulic system adopts high-precision filtering device, which is generally 5 ~ 10 according to the provisions of electro-hydraulic servo valve on filtering precision μ m； Finally, after general pickling and passivation treatment, the hydraulic system, automobile oil tank and pipeline system software will introduce high viscosity gear oil or turbine oil to carry out no-load cycle system cleaning.

Proper installation of the hydraulic system is only the first step, and the following adjustment shall be carried out in the following ways:

1. Zero position adjustment, including the zero adjustment of the hydraulic valve of the four column hydraulic press and the zero adjustment of the servo amplifier. In order to better adjust the zero position of the system software, bias voltage is sometimes added;

2. Static data detection of four column hydraulic press system software, measure the static data association between the measured main parameters and the command data signal, and adjust the effective expansion ratio. Generally, the larger the magnification, the smaller the static data deviation and the higher the linearity, but it is easy to lead to system instability;

3. For the dynamic testing of the system software of the four column hydraulic press, the dynamic testing equipment shall be selected. Generally, the reliability, phase frequency characteristics and deviation of the system software shall be measured to determine whether it can meet the provisions of the design scheme. The dynamic and static data testing records of the system software can be used as the basis for the evaluation of the operation of the system software in the future.

4. After the hydraulic system is put into operation, it shall regularly maintain and count the relevant standard values, temperature, steam pressure and environmental pollution level of hydraulic oil, as well as its stable operation, zero deviation of actuator, and track the signal by components.

To sum up, before announcing the application of the four column hydraulic press, the hydraulic system was properly assembled and adjusted with reference to the needs and instructions of the hydraulic press manufacturer.