Travel control, with two fast proximity switches at the same time open the pressurization solenoid valve. At present, each is pressure control, to be shot to the head of the piston does not move, the pressure in the pressure injection cylinder only to rise to the system pressure, the pressure to push open the booster start valve, anyway, this set of things is complicated enough, a **** eight hydraulic parts, now Izumi solenoid valve to solve the problem with a solenoid valve. Another point, the current set of pressurization to start things, small valves to open the large valve, the second pass due, first of all, the valve opens slowly, the valve opens the pressurizing piston before the movement of the pressurizing piston will have to move two or three centimeters to close the floating piston, pressurization only appeared to build the pressure time is long.
So Izumi's set is simple and has a short build time. Then there is another parameter, the adjustability of the build time. For example, a single circuit machine, the build time is not adjustable. Then the old 160T also engaged in stroke control, but the old 160T did not have a floating piston, is built-in check valve type of pressure injection system, engage in stroke control, build pressure time is not adjustable, because its build pressure time is its built-in check valve spring closure spool time. But with a floating piston pressure injection system is different, because with a proximity switch at the same time to start the pressure injection and pressurized piston, in the pressurized piston forward movement, the floating piston is also pressurized by the injection of oil forward, has been against the pressurized piston rod on the hole disc, floating piston and pressurized piston rod between the two centimeters distance, has been fixed, to be pressurized to the head of the injection piston does not move, the floating piston only to stop the movement, then at this time the pressurized piston and then go through the last two centimeters of the stroke, the pressurized piston and then go through the last two centimeters of the journey, the pressurized piston and then stop the movement. The last two centimeters of the stroke, the pressurization is established. Pressure building time can be simply understood as the time required for the pressurizing piston to complete the last two centimeters of the stroke, then you adjust the pressurizing handwheel, the precision of this time adjustment can be guaranteed, and even the magnitude and precision of its adjustment is much better than that of the current pressurizing start-up method.
Why use the stroke control booster start, is because the pressure to start booster, hydraulic parts are too many, complex. But if the built-in check valve type of pressure injection system with a stroke to start the pressurization, its building time can not be adjusted. So the old guy at home and abroad before enough stupid than, with the stroke start booster it, the old 250T or more machines are with a floating piston, he chose a 160T, not with a floating piston to engage in.
Floating piston, pressure booster start method, dual circuit, all designed for the Germans, has always been the three major features of the advanced pressure injection system, after decades of unchanged, verified the die casting machine world of mediocrity into a pile. Floating piston is the die-casting machine industry to the hydraulic industry, a contribution to the industry's own invention, set the pressurized piston rod and hydraulic check valve and one, clean and simple, sealing is good, high-pressure oil contact seals at least. But the floating piston type pressure injection system, due to the opening of the pressurized start valve and the movement of the pressurized piston, there is a certain sequence, in the construction of the pressure time is a little bit of beauty, has always been criticized for the industry technology speculators, such as Jiexun's that bad structure, strange appearance, with a built-in check valve, with its rags also dare to set another flag in the domestic die-casting machine industry. Built-in check valve injection system, because the check valve (equivalent to floating piston) of the closure and pressurization to start the opening is the same time, may build pressure time on a few milliseconds short, engaged in die casting machine industry in the technology and hype Luo digging with the poor, there is a sacrifice of the old 250T this pile of crap retro possible. Here there is a vice president of a Chongqing die-casting plant poor Kan chaotic blowing built-in check valve.
Izumi's solenoid valve replaces the entire current pressurized starter valve group, seems simple, but has some significance. To a large extent, breaking the traditional laws of die-casting machine technology for decades, the pressure boost start method for advanced die-casting machine, one of the three characteristics, a write-off. Bold and simple, for the Chinese people in die casting machine technology on the new tree.