Why is the pressure of the four-column hydraulic press system unbalanced

Why is the system pressure of the four-column hydraulic press unbalanced? What causes it? Today, let's take a look at the reasons for the pressure imbalance of the four-column hydraulic press system.

1, the pressure imbalance caused by the hydraulic pump of the four-column hydraulic press

(1) The axial and radial clearance of the hydraulic pump increases due to wear;

(2) The "trapped oil" of the oil pump has not been perfectly treated;

(3) The processing and equipping accuracy of the parts in the oil pump is poor;

(4) Some parts in the oil pump are damaged.

2, the pressure imbalance caused by the hydraulic control valve of the four-column hydraulic press

(1) The taper valve of the pilot valve is poorly matched with the seat;

(2) the pressure regulating spring is too soft or damaged;

(3) the damping hole of the main spool is congested, and the spool loses tube manufacturing;

(4) The main valve spool is stuck in the open or closed position by dirt;

(5) When the relief valve is used for remote control, its remote connection channel is too small or leaking;

(6) When the relief valve is used as a unloading valve, the reversing valve that controls the unloading fails.

(7) The hydraulic charge occurs when the oil circuit is switched too fast;

(8) The solenoid reversing valve reversing push rod is too long or too short.

3. Pressure imbalance caused by auxiliary components of four-column hydraulic press

(1) Oil filter congestion;

(2) The liquid channel is too small, and the oil return is not smooth;

(3) the oil viscosity is too thick or too thin.

4. Others

(1) The mechanical part of the four-column hydraulic press is not adjusted well, and the conflict resistance is too large;

(2) Air enters the system;

(3) oil pollution;

(4) Insufficient motor power or insufficient speed;

(5) The pressure indicating device has obstacles.