hydraulic circuit

[MRASHID]

hello
I couldn't solve all the details of attached circuit.
may you help me to understand how this circuit works it is for injection moulding machine
thanks in advance

 

[gersen]

Where is your problem?

 

[MRASHID]

for instance, may you explain to me how injection is taking place? why all those valves for injection? are directional, relief and proportional valves only
not enough to achieve the same function?

 

[Stick.]

Can you post a more legible version of the schematic (either a high quality scan or the original pdf)? It's hard to read the schematic in the picture you posted.

Related to gersen's post, is something on the machine not functioning correctly, or are you just attempting to learn how it works?

 

[mpsaju]

MRASHID

Ar you still interested in understanding this circuit. Perhaps I could be of help. If one looks at the circuit, one can understand that injection is accomplished with a twin cylinder actuation, meaning that injection takes place by pressurising the rod-side of the cylinders in tandem. The small proportional pressure relief valve is meant to control the "back pressure " on the screw while it is rotated for plastcising the melt (recharging the melt to get ready for injection). The small two solenoids connected to each of the cylinder ports are meant to releive the pressure on the screw when no actuations are occurring.

If you have clarifications on this, I can help.

MPSAJU