Motors: expansible chamber type – With motive fluid valve – Pilot valve
Patent
1993-04-09
1995-06-13
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Pilot valve
60494, 100 53, F15B 1108, F16D 3102
Patent
active
054232449
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a hydraulic circuit for an apparatus for generating pressure and to an apparatus for generating pressure which uses said hydraulic circuit.
In particular the field of the present invention is the same one described in the patent application PCT No. WO 89/11969 and in the Italian patent applications No. 19202 A/89 and 19203 A/89, and hereinafter reference will be made only to the patent application PCT No. WO 89/11969 for the sake of simplicity, reference to the two corresponding Italian applications being also assumed thereby. More in particular, the field of the present invention is that of hydraulic circuits and of pressing devices which use an open hydraulic circuit, a tank and a pressing chamber. The pressing chamber generally directly actuates the movement of a hydraulic piston. The hydraulic circuit comprises a positive-displacement pump for directly performing the final pressing, which has a flywheel for storing kinetic energy and can pump its flow directly into the pressing chamber by means of one-way valve means which are open toward the pressing chamber. The hydraulic circuit furthermore comprises first direction control valve means for discharging into a tank the flow of the pump, so that the closure of the first valve means can directly generate the pressure and so that the flywheel accumulates and yields kinetic energy respectively during the opening and the closure of the first valve means. The hydraulic circuit finally comprises a pilot line for the first valve means and delay valve means for delaying the opening of the first valve means. In particular, the delay valve means are generally hydraulically connected to the poppet of the first valve means and comprise, for example, throttling valve means which are connected in parallel to one-way valve means which are closed toward the poppet of the first valve means.
The field of the apparatus for generating pressure according to the invention furthermore preferably comprises: an opening of a wall of the pressing chamber and a valve for quick filling and emptying arranged at said opening. A port of the valve is contained in a tank.
The above is in summary the main field of industrial utilization of the invention, but said field does not constitute a limitation of the scope thereof, since the apparatus and the circuit according to the invention, in particular as described and claimed hereinafter, can be advantageously used in any other equivalent field in which pressing operations are performed.
An apparatus and a circuit as described above are known from the patent application PCT No. WO 89/11969 and allow to achieve a very high energy saving, together with a high speed, high pressing force, oil overheating control, reduction in the number of components, high precision in the setting of speeds, pressures and movements, as well as high reliability and automatic control of operation, as indicated in detail in the application WO 89/11969.
The aim of the present invention is to achieve all of the above described objects and to additionally achieve a further energy saving comprised between 30% and 50% of the consumption of the apparatus described in application WO 89/11969.
A further object of the invention is to increase the precision of the actuation of the pressing, thereby obtaining both a better processing and an increase in the overall speed and thus in the maximum number of overall pressing cycles in the unit time.
A further object of the invention is to reduce by up to 10 times the frequency of charging of the auxiliary equipment accumulator, in particular when the machine is on but idle.
It has been observed in practice that the invention achieves the intended aim and all of the objects with a hydraulic circuit which is characterized in that said first valve means comprise second remotely controlled direction control valve means which are arranged so as to actuate the opening of said first valve means, closing said pilot line and connecting said delay valve means to said tank, and so as to actuate the closure
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patent: 5140895 (1992-08-01), Imanishi
Look Edward K.
Nguyen Hoang
S.I.T.I. Societa Impianti Termoelettrici Industriali S.p.A.
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