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What is the use of “pumps” in the extruder hydraulic system?

October 24,2019

Extruders have a lot of knowledge to learn. Only when they are familiar with and understand enough can they avoid some unnecessary troubles. Proper use and understanding can effectively improve the work efficiency. So let’s learn some knowledge about the three extruders brought by today’s small editors.

1. Why is there a pilot pump and two mainpumpsin the hydraulic system of the extruder?
The reason why there is a pilot pump and two mainpumpson the hydraulic system is that the pilot pump supplies oil to the main pump, thus improving the sensitivity of the variable pump. That’s why it was set up like this.
PE Heat Insulation Pipe Extrusion Line

2. Why is the parallel pump disconnected?
The extruder has the function of combining the oil cylinder and the pump, that is, the oil of the vane pump is also supplied to the main cylinder for fast forwarding and working, so that the main cylinder can reach the speed for fast forwarding, and the pressing time after working is shortened, because both the vane pump and the plunger pump are driven by the same motor. If the plunger pump pressure reaches 150MPA and the pressure is 210MPA higher, the vane pump will also start pressing at the same time, which will drag the motor to death, and the motor will not be able to load and burn off. Therefore, when the plunger pump pressure reaches the set pressure, the vane pump will be powered off to return oil and cannot start pressing.

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3. What is the function of the pressure pump?
Pressure guiding is often referred to as control oil, which is used to control the regulating valve core of plunger pump and the valve core of reversing valve. Pressure guiding oil is controlled by electromagnetic valve.

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