JPH0728203U - Hydraulic booster - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a hydraulic pressure booster that can easily handle not only high pressure but also low pressure. [Constitution] A preload chamber 5 connected to an oil reserve chamber 4 for storing hydraulic oil is provided. Then, along with the inner wall of the preload chamber 5, the preload piston 6 which can move up and down freely is inserted, and the hydraulic pressure generating hole 8 is formed at the position adjacent to the preload chamber 5. The hydraulic mechanism 2 configured as described above is configured to be connected to the pneumatic mechanism 3 configured by a pneumatic cylinder 9 having a rod 9a that is movable along the hydraulic pressure generation hole 8. [Effect] In this hydraulic booster, by providing the preload chamber and the preload piston, a wide range of hydraulic pressure from low pressure to high pressure can be supplied to the hydraulic equipment, and the preload piston and the cylinder rod of the pneumatic mechanism are independent. Therefore, it is possible to easily cope with the use of only low pressure or only high pressure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulic pressure booster that can easily control not only high pressure but also low pressure hydraulic pressure.

[0002]

[Prior art]

 Conventionally, most of the hydraulic pressure boosters found in hydraulic cylinders and the like try to obtain the required hydraulic pressure by applying pressure to the hydraulic oil by air pressure. In these pressure boosters, the output hydraulic pressure is increased from several times to several tens of times the input air pressure. It is known that such a hydraulic booster is used not only in a large machine but also in a hydraulic mechanism for breaking a mandrel of a blind rivet in a blind rivet crimping machine, for example.

[0003]

[Problems to be solved by the device]

 However, when the above hydraulic booster is used for a small machine such as a blind rivet caulking machine, the working hydraulic pressure is too high, and the chuck unit may damage the work surface when gripping the work. Further, in the case of the blind rivet crimping machine, when the mandrel of the blind rivet is gripped, an excessive gripping force is exerted, which causes a problem that the sleeve part of the blind rivet is deformed. In the industry, there is a demand for early resolution of such problems.

[0004]

[Means for Solving the Problems]

 An object of the present invention is to solve the above problems and to provide a hydraulic pressure booster that can easily cope with not only high pressure but also very low pressure. To achieve this purpose, a preload chamber connected to the oil reserve chamber that stores hydraulic oil is provided. A preload piston that can move vertically is inserted along the inner wall of the preload chamber, and a hydraulic pressure generation hole that allows the working oil to move from the preload chamber is formed at a position adjacent to the preload chamber. The hydraulic mechanism configured as described above is configured to connect an air pressure mechanism configured by an air pressure cylinder having a rod having the same diameter as the hydraulic pressure generation hole and movable along the hydraulic pressure generation hole. .

[0005]

[Action]

 When air is supplied to the preload chamber, the hydraulic oil is compressed by the preload piston, and a low hydraulic pressure can be obtained. Further, when air is supplied to the pneumatic mechanism, high hydraulic pressure can be obtained as in a normal pressure booster.

[0006]

【Example】

 An embodiment according to the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes an oil pressure booster, which includes a hydraulic mechanism 2 filled with hydraulic oil and an air pressure mechanism 3. The hydraulic mechanism 2 has an oil reserve chamber 4 in which an oil supply hole 4a is formed on the upper surface, and the oil reserve chamber 4 is connected to the oil reserve chamber 4 at a position adjacent to the oil reserve chamber 4 by a communication hole 4b having a small diameter. A preload chamber 5 is provided. The preload chamber 5 has a bottomed round hole structure, and a preload piston 6 which is closely attached to the inner wall of the preload chamber 5 and is vertically movable along the inner wall is inserted therein. Further, a cap 5a for sealing the preload chamber 5 is fitted into the open end of the preload chamber 5, and an air supply pipe 7 whose tip extends into the preload chamber is inserted at the center position of the cap 5a to supply air. The preload piston 6 is thus actuated. The pressure ratio between the hydraulic pressure generated by the operation of the preload piston 6 and the air pressure applied to the preload chamber 5 by the air supply pipe 7 is 1: 1.

A hydraulic pressure generating hole 8 is formed at a position below the preload chamber 5. The hydraulic pressure generating hole 8 and the preload chamber 5 are connected by a small diameter oil supply hole 5b, and the hydraulic pressure generating hole 8 is also provided. The inner diameter of the hydraulic pressure generation hole 8 at the position where the oil supply hole 5b and the oil supply hole 5b intersect is set to be slightly larger than the other diameters. In addition, a screw portion 8a is formed on the front surface of the hydraulic pressure generating hole 8 so that it can be connected to a pneumatic hydraulic device (not shown).

On the other hand, an air pressure mechanism 3 is connected to the rear of the hydraulic pressure generating hole 8, and the air pressure mechanism 3 is composed of an air pressure cylinder 9 having a rod 9a. The rod 9a of the pneumatic mechanism 3 is located coaxially with the hydraulic pressure generating hole 8 and can slide in the hydraulic pressure generating hole 8 by its extension, and has the same diameter as the inner diameter of the hydraulic pressure generating hole 8. Therefore, the hydraulic oil can be applied with pressure when sliding in the hydraulic pressure generating hole 8. Further, the pneumatic mechanism 3 has an air hole 3a for supplying and discharging air, and the rod 9a is configured to move forward and backward by the air supplied and discharged therefrom. The ratio of the air pressure in the pneumatic mechanism 3 to the hydraulic pressure generated as the rod 9a extends is set to 1:25.

Next, the operation of the embodiment will be described. In the hydraulic pressure booster of the present embodiment, first, when air is supplied to the preload chamber 5, the hydraulic oil filled in the hydraulic mechanism 2 is pressurized as the preload piston 6 descends. Since the ratio of air pressure to hydraulic pressure is 1: 1 at this time, it is used, for example, in a blind rivet crimping machine when gripping the mandrel of the blind rivet, or when gripping or holding a work by a chuck unit. Is perfect for Further, when air is supplied to the pneumatic mechanism 3, the rod 9a extends, and the hydraulic oil in the hydraulic mechanism 2 is pressurized accordingly. Since the ratio of air pressure to oil pressure at this time is 1:25, it is most suitable for the working machine that requires a strong force such as when breaking the mandrel of the blind rivet in the former example of the line rivet crimping machine. .

The configuration of the present invention is clearly understood from the above description and the drawings, and any modification, alteration or application of the present invention is included in the technical idea shown by the scope of claims for utility model registration. It goes without saying.

[0011]

[Effect of device]

 As described above, the present invention provides the preload chamber connected to the oil reserve chamber for storing the hydraulic oil. A preload piston that can move up and down along the inner wall of the preload chamber is inserted, and a hydraulic pressure generation hole that allows the working oil to move from the preload chamber is formed at a position adjacent to the preload chamber. An oil pressure increasing mechanism configured to connect an air pressure mechanism configured as described above with an air pressure cylinder having a rod having the same diameter as the oil pressure generating hole and movable along the oil pressure generating hole. It is a pressure device. In this hydraulic booster, by providing a preload chamber and preload piston, it is possible to supply a wide range of hydraulic pressure from low pressure to high pressure to hydraulic equipment such as hydraulic cylinders, and the cylinders of the preload piston and pneumatic mechanism. Since it is independent of the rod, it can easily be used for low pressure only or high pressure only.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a hydraulic booster according to the present invention.

[Explanation of symbols]

 1 Hydraulic Booster 2 Hydraulic Mechanism 3 Pneumatic Mechanism 3a Air Hole 4 Oil Reserve Chamber 4a Oil Supply Hole 4b Communication Hole 5 Preload Chamber 5a Cap 5b Oil Supply Hole 6 Preload Piston 7 Air Supply Pipe 8 Hydraulic Pressure Generation Hole 8a Screw Port 9 Pneumatic Cylinder 9a rod

Claims (1)

[Scope of utility model registration request] 1. A preload chamber connected to an oil reserve chamber for storing working oil is provided, and a preload piston movable vertically is inserted along the inner wall of the preload chamber, and the working oil moves from the preload chamber. In the hydraulic mechanism in which a free hydraulic pressure generating hole is formed at a position adjacent to the preload chamber, an air pressure mechanism including a pneumatic cylinder having a rod having the same diameter as the hydraulic pressure generating hole and movable along the hydraulic pressure generating hole is provided. Hydraulic booster characterized by being connected.