Hydraulic Press

Introduction of hydraulic pump

Posted by

Grace

May 11, 2021

On December 11, 2020

1.Overview of hydraulic pumps

Hydraulic press equipment,Hydraulic pump — power element：

The mechanical energy of the driving motor is converted into the pressure energy of the liquid for use in the hydraulic system, which is the energy source of the hydraulic system.

2.Working principle and classification of hydraulic pump

2.1 Classification of hydraulic pumps

Hydraulic press equipment,Can be divided according to whether the displacement can be adjusted:

Dosing pump (dosing motor)

Variable pump (variable motor)

Divided by structure:

Gear

Blade

Plunger

Spiral

2.2 Working principle and graphic symbols of hydraulic pump

(1) Working principle of hydraulic pump

Hydraulic press equipment,The hydraulic pumps used in the hydraulic drive system are all positive displacement, and their working principle is shown in the figure.

Oil absorption: the sealed volume increases, forming a partial vacuum;

Oil pressure: The sealing volume decreases and the pressure increases.

Positive displacement pump:

Rely on the change of sealed volume to suck oil and press oil.

Two characteristics:

1.1 There are periodic seal volume changes.

When the sealed volume changes from small to large, oil is sucked; from large to small, oil is pressed.

1.2 There is an oil distribution mechanism.

Make sure that when the sealing volume changes from small to large, only the suction pipe is conceived; when the sealing volume changes from small to large, only the pressure pipe is conceived (such as two check valves)

(2) Graphic symbols for hydraulic pumps and hydraulic motors