Pumps – Three or more cylinders arranged in parallel – radial – or... – Radial cylinders
Patent
1998-06-09
2000-08-29
Doerrler, William
Pumps
Three or more cylinders arranged in parallel, radial, or...
Radial cylinders
417219, F04B 2704, F04B 106
Patent
active
061098841
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a rotational hydraulic transformer capable of continuous increasing/decreasing of pressure, to be suitably used for driving concrete crushers and the like.
2. Background Art
Known arrangements for crushing concrete generally use hydraulic-driven crushers and the like which are capable of exhibiting great force. Accordingly, due to the fact that force stronger than normal is necessary for breaking steel reinforcements within the concrete when crushing steel-reinforced concrete buildings and the like, temporary increase in output is conducted by means of increasing hydraulic pressure when necessary. This is in order to maintain the system pressure low at normal times, to reduce loss of force and to improve durability of hydraulic equipment. Accordingly, such types of hydraulic equipment is provided with hydraulic mechanisms for raising the system pressure above the predetermined system pressure for supplying to an actuator. There are generally known the two following types of pressure raising methods used in such hydraulic mechanisms for raising pressure. cylinders having different effective areas ahead of and behind pistons fitted into the cylinders are used, so as to raise the hydraulic pressure connected to the side with smaller effective area than the hydraulic pressure connected to the side with greater effective area. shaft of a hydraulic motor are mechanically linked, in which the hydraulic pressure obtained from the pump is raised above the hydraulic pressure driving the motor, by means of making the volume of the motor to be greater than the volume of the pump.
Particularly, regarding concrete crushers, booster cylinder devices based on the method described in (A) are often used to raise pressure, and examples of such include that disclosed in Japanese Unexamined Patent Publication No. 62-297508, described below in detail.
However, booster cylinder devices such as described in (A) have the problem that they are basically not suitable for continuous operation. This is because the operation of increasing pressure ends at the point that the piston reaches one of the stroke ends. In order to solve this problem, the booster cylinder device described in the aforementioned Japanese Unexamined Patent Publication No. 62-297508 has generally the following construction. Making description with reference to FIG. 11, booster chambers 02, formed to the right and left sides in FIG. 11 of a booster piston 01 for raising pressure having a large-diameter portion 011 partway thereupon, are connected via check valves provided to the outside of each of the booster chambers 02, a high pressure port OP and low pressure port OT are each connected to booster piston chambers 03 formed to the front and rear of the large-diameter portion 011 so as to be switchable by a switching valve 04, and three concave grooves 051, 052, and 053 provided to the inside face of the small radial portion of a cylinder 05 are arranged such that the groove 051 on one end is connected to high pressure P1 while the groove 053 on the other end is connected to low pressure T, and the middle groove 052 is connected to a control port 041 for the aforementioned switching valve 04, and a concave groove 012 is provided to the outside face of the small diameter portion of the booster piston 01 so as to connect the middle groove 052 to either one of the groove 051 on one end or the groove 053 on the other end, at the time that the booster piston reaches the proximity of one of the stroke ends. Incidentally, the terms "right" and "left" in the subsequent description here shall refer to that in FIG. 11.
In FIG. 11, a state is shown wherein the high pressure port 0P is connected to the right booster piston chamber 03 and the booster piston 01 is moving toward the left. Subsequently, at the point that the booster piston 01 reaches the proximity of the left stroke end, the middle groove 052 is connected to the groove 051 on one end, and high pressure is introduced to the switching v
REFERENCES:
patent: 5651301 (1997-07-01), Thoma et al.
patent: 5752427 (1998-05-01), Leutner
patent: 6010311 (2000-01-01), Thoma et al.
Doerrler William
Hirose Valve Industry Co. Ltd.
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