Rapid press-shooting cut-off mechanism for magnesium alloy cold chamber die casting machine

Abstract

The invention discloses a rapid press-shooting cut-off mechanism for a magnesium alloy cold chamber die casting machine. The rapid press-shooting cut-off mechanism comprises a first solenoid directional valve, a first inserting valve, a second inserting valve and a stop valve, wherein a hole P, a hole A and a hole B of the first solenoid directional valve are respectively corresponding connected with an energy accumulator, a control hole C of the first inserting valve and the control hole C of the second inserting valve; a hole B of the first inserting valve is connected with the energy accumulator; the hole A of the second inserting valve is connected with an oil tank; the hole A of the first inserting valve is connected with the hole B of the second inserting valve and is connected with a port X of the stop valve; and the port X is used for controlling the stop valve to switch on and off. The rapid press-shooting cut-off mechanism is reasonably designed and is capable of realizing the functions of external controlled one-way flow and bidirectional cut-off, shortening the decompression time and promoting the stability of rapid press-shooting cut-off.

Description

technical field [0001] The invention relates to the technical field of die-casting equipment, in particular to a fast injection cut-off mechanism of a magnesium alloy cold chamber die-casting machine. Background technique [0002] Accumulators are used as energy sources for rapid injection in injection parts of magnesium alloy cold chamber die-casting machines. Some domestic magnesium alloy cold chamber die-casting machines adopt the structure of on-off valve and check valve. figure 1 It is a schematic diagram of the hydraulic pressure used by a traditional check valve on a magnesium alloy cold chamber die-casting machine. The on-off valve for oil supply from the accumulator 1 is composed of a cartridge valve 2 and a pilot control solenoid valve 5. Due to the pressurization after the rapid injection , so usually a one-way valve 3 is set between the injection cylinder 4 and the fast accumulator 1 . Therefore, the performance of the one-way valve 3 directly affects the press...

AI Technical Summary

Problems solved by technology

[0003] The traditional one-way valve structure used in the fast injection of magnesium alloy cold chamber die casting machine is as follows: figure 2 The figure includes a valve body 301, a spool 302 located in the valve body and a spring 303 connected to the spool 302. When the oil pressure at port A is greater than that at port B, the spool moves back against the spring force so that the medium can flow from port A 304 to port B. Port 305; when the oil pressure of port A 304 is lower than that of port B 305, the spool moves forward under the combined action of the spring return force and the medium pressure so that port A 304 and port B 305 are cut off, and the medium cannot reach port A from port B 305 304

Although the structure of this type is simple, its stability needs to be strengthened because its function of "preventing reverse flow" is easily affected by the pressure change of port A 304 and port B 305

The magnesium alloy cold chamber die-casting machine is pressurized after the rapid injection. The check valve 3 will not start to close until the oil pressure of the B port is greater than that of the A port after the pressurization. It cannot be closed immediately after the rapid injection, resulting in pressure buildup. Larger pressure fluctuations are generated in the process, and because of this hysteresis fluctuation, the pressure building time is prolonged

For a one-way valve with large flow and large diameter, it is very difficult to improve the closing response time

[0004] In short, when the magnesium alloy cold chamber die-casting machine requires a short pressure build-up time and high stability, it is obviously difficult for the traditional check valve to meet the requirements.

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