Hydraulic press fast motion circuit, also known as the speed loop, its role is to make the hydraulic actuator in the empty stroke rapid movement to lift
High system efficiency or full use of power. 500 tons hydraulic press A machine that uses hydrostatic pressure to process metal, plastic, rubber, wood, powder and other products. It is often used in pressing processes and pressing forming processes, such as: forging, stamping, cold extrusion, straightening, bending, flanging, sheet drawing, powder metallurgy, pressing and so on. The basic principle is that the oil pump transmits the hydraulic oil to the integrated cartridge valve block, and the hydraulic oil is distributed to the upper or lower chamber of the cylinder through the various check valves and relief valves, and the cylinder is moved under the action of high pressure oil. A hydraulic press is a device that uses liquids to transmit pressure. Plastic products hydraulic press is generally expressed by nominal working force (kN) or nominal tonnage (ton). Forging hydraulic press is mostly hydraulic press, high tonnage. In order to reduce the size of the equipment, large forging hydraulic presses are commonly used with higher pressure (about 35 mpa), and sometimes ultra-high pressure above 100 mpa is used. Hydraulic presses for other purposes generally use a working pressure of 6 to 25 mpa. The tonnage of the hydraulic press is lower than that of the hydraulic press. The principle of the composite hydraulic press is the use of PASCAL's law made of the use of liquid pressure transmission machinery, there are many kinds. Of course, the use is also varied according to the need. Such as according to the type of liquid to transfer pressure, there are two categories of hydraulic press and hydraulic press.
Hydraulic cylinder differential connection for rapid development of motion control circuits.
Hydraulic press circuit is the use of two three-way electromagnetic reversing valve 3 to realize the differential connection of hydraulic cylinder fast moving circuit.
In this circuit, when the electromagnet 2ya is energized and 3ya is closed, valve 3 connects the left and right cavities of the hydraulic cylinder and is connected at the same time.
Through the pressure oil, the tension hydraulic press makes the hydraulic cylinder form a differential connection for rapid movement. When 3YA is energized (2YA is still energized), the differential is connected.
The connection is cut off, and the oil return of the hydraulic cylinder flows back to the tank through the speed control valve 2, so that social work and feed can be realized. When 2YA loses power,when iya and 3ya are energized, the pressure oil enters the right chamber of the hydraulic cylinder through valve No. 1, valve No. 2 (check valve) and valve No. 3, and the oil in the left chamber flows back to the tank through the valve, thus achieving a rapid withdrawal. This connection can improve the movement of the hydraulic cylinder without increasing the flow rate of the hydraulic pump.
But note that the flow of the pump, along with the flow of the rod chamber, passes through the pipe into the rod-free chamber. As a result,the valve and pipeline should be selected according to the flow rate of the difference, otherwise it may make the resistance of the patient's liquid as the flow is too large, and the pressure of the oil supply system of the pump is too large.
So that part of the working pressure oil of the pump can overflow from the relief valve back to the tank, the speed can be slowed down and can not achieve the purpose of complete differential maximum fast forward.
