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The working principle of hydraulic crushing hammer of excavator is explained in detail

Jul 17, 2018

The relation between the area A1 affected by the oil pressure in the upper chamber of the cylinder body and the area A2 affected by the oil pressure in the lower chamber of the cylinder body is A1>A2, and A2 is always under high pressure. When A1 changes from high pressure to low pressure, the piston moves upwards, along with high pressure nitrogen stored in the cylinder body.


1.Bell piston

Initial situation: both the piston and the valve are at their lower end. The upper cavity of cylinder body is under low pressure, and the high pressure cavity of cylinder body and valve is always under high pressure at any time. The low pressure chamber connected with the oil return port is always at low pressure. The low pressure chamber is connected with the cylinder body conversion chamber. At this time, the A5 connected with the cylinder body conversion chamber is under low pressure, so the cylinder body conversion chamber is under low pressure before the piston moves upward.

Because area A3 and A4 are under high pressure (A3 > A4), the valve is forced downward before A5 is under high pressure.

High pressure oil enters the lower chamber of the cylinder body and causes the piston to rise.

When the piston began to move upward, the oil pressure in the piston transfer chamber did not change.

When the piston moves upwards, high pressure nitrogen is pressurized.


2.Valve up 

When the piston moves to the middle, the cylinder body conversion chamber is connected to the lower chamber, so that the cylinder body conversion chamber is under high pressure. A3, A4 and A5 are all under high pressure, and their area is relative to A4+A5>A3, so that the valve is under upward pressure and the valve moves upwards under the force. When the piston stops moving, the high pressure nitrogen energy storage reaches the maximum.


3.Macrophage piston

When the piston is up, the piston transfer chamber is connected to the high pressure chamber in the valve, so that the upper chamber of the cylinder body becomes under high pressure. Both upper and lower Chambers are subjected to high pressure, and A1 > A2, piston is subjected to downward force. On the other hand, high pressure nitrogen pressure gives the piston a downward force, which allows the piston to move rapidly downward.


4.valve down

Prior to this, the piston struck the bar, and the cylinder body's conversion chamber was connected to the low pressure chamber, so that the A5 was subjected to low pressure. A3, A4 under high pressure, A3 > A4, so the valve moves down.

Turbine piston work

When the valve moves downward, the piston strikes the bar.

When the piston hits the bar, the piston begins to move upwards.

The hydraulic hammer is repeated successively for completion of work.