JPS59231202A - Cylinder equipment - Google Patents

Abstract

PURPOSE:To automatically get a high pressure at an arbitrary stage of a stroke by actuating a valve mechanism contained in a cylinder due to variation of pressure accompanying increase of external force so as to automatically push a booster piston. CONSTITUTION:Air is sent from a valve 20 into a chamber A to force a loose piston 4 in the direction J so that the oil inside a chamber B is fed via a chamber C into an external cylinder at a high speed. When the external force applied on the cylinder is increased, the oil inside the chambers B and C and the air inside the chamber A are boosted in pressure. A valve body 8 is then forced to move in the direction J to open passages 15 and 16. Air therefore rushes into a chamber D via a tube 23 and a passage 18 and pushes a booster piston 5 to move a ram 7 in the direction H so that communication of the chamber B with the chamber C is closed together with the valve body 8. The oil inside the chamber C is increased in pressure because the ram 7 and the booster piston 5 have a difference in diameter. When air is sent into a chamber F by changing over the valve 20 and the air inside the chamber D is released into the atmosphere via the chamber E and the valve 20, the oil inside the chamber C flows into the chamber B so that the loose piston 4 is returned to the original position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention supplies high-pressure oil when needed during movement, such as punching presses and caulking operations, and supplies low-pressure oil when speed is required in other cases. This relates to a pneumatic hydraulic cylinder device that supplies a large amount of oil and a hydraulic cylinder device that supplies high pressure oil using low pressure oil.
This cylinder device has a relatively simple structure, is compact, satisfies the above requirements, and is characterized by being able to automatically obtain the required high-pressure oil at any location during the cylinder stroke. As seen in similar air-hydraulic cylinder devices up until now, in order to supply high pressure oil only during the final stroke of the cylinder stroke, the position of the cylinder where high pressure is produced must be adjusted midway through the working process. , or by adjusting the position of the workpiece so that the cylinder is at a position that produces high pressure, or by sensing the position of the workpiece using a limit switch, etc., and switching the solenoid valve. The purpose is to eliminate the inconvenience and inefficiency of switching to high pressure, and the diseconomies associated with installing limit switches, etc.

Embodiments of the present invention will be described with reference to FIGS. 1 and 3. First, referring to FIG. 1, compressed air (hereinafter referred to as air) is generally used as the supply fluid and oil is used as the liquid, so in the following explanation, the supply fluid will be explained as air and the internal liquid as oil. 1, 2, and 3 are first, second, and third cylinders; 4 is a floating piston fitted between the first and second cylinders; 6 is a liquid supply port; 6 is an oil supply port to the outside; The cover block 11 is provided with a pressure increasing piston 5 fitted in the third cylinder; 7 a ram having a smaller diameter and integrated with the pressure increasing piston 5; 10;
It is configured to pass through the partition block 10, pass through the valve body 8, and pressurize the C chamber (secondary oil chamber), and the valve body 8 is fitted into the partition block 10. When the pressure in chambers C and E increases and exceeds a properly determined pressure, the blocks 15 and 16, which had been shut off, move in the J direction against the force of the spring 9. A series of valves that open the fluid passage and close the liquid passage (hereinafter referred to as the liquid passage) including the liquid passage 14 that communicates the B chamber (primary oil chamber) and the C chamber with the movement of the ram 7. It forms a mechanism. 12 is a cover block, 13, 18, 19 are fluid passages, 20 is a four-way solenoid valve, and 21, 22, 23 are tubes.

Chamber B, C and the liquid passage are filled with oil; chamber G is 17;
It is open to the atmosphere through the exhaust port. If the pressure receiving area of the valve body 8 in the axial direction (J direction) due to the pressure in the E chamber is made small, the movement of the valve body 8 will be almost performed only by the oil pressure in the C chamber. FIG. 3 then shows three commonly available cylinders, 31, 32, 33, and 34, 3, operatively connected according to the cylinder arrangement of the present invention.
5, 36 are pistons of the respective cylinders. 31
, 32, 33 are connected to the cylinder device 26 of the invention by a liquid supply tube 30, and the return of the pistons 34, 35, 36 is via a solenoid valve 27.
, by means of a tube 29 connected to . The operation of the cylinder device configured as above will be explained.

First, it is assumed that the external force applied to the cylinders 31, 32, and 33 is small and that no large force is applied to the pistons 34, 35, and 36, that is, the C chamber is in a low pressure state. Air is supplied from the four-way solenoid valve 20 and the tube 22, and the air entering the fluid passage 13 enters the A chamber and pressurizes the floating piston 4, causing it to move in the J direction.
The oil in chamber B enters chamber C through the liquid passage, and through the liquid supply port 6 and tube 30, low-pressure oil is supplied to the external cylinders 31, 32, and 33 at a high speed. Next, assume that the external force applied to the cylinders 31, 32, and 33 increases. Pistons 34, 35, 36
, the oil pressure in chambers B and C and the air pressure in chamber E rise, and when the pressure exceeds a predetermined pressure, the valve body 8 moves in the J direction, and the fluid passages 15, 16, is opened via the expanded K chamber, and the air enters the D chamber through the tube 23 and the fluid passage 18, pressurizing the pressure boosting piston 5, moving the ram 7 in the H direction, and moving the air into the B chamber. A liquid passage communicating with the C chamber is closed by a valve mechanism consisting of a valve body and a valve body. If the pressure booster piston 5 is further pressurized, the ram 7 has a smaller diameter than the pressure booster piston 5, so the fluid pressure (high pressure) based on Pascal's principle is applied to the C chamber and the cylinder 31.
, 32, 33, and the oil in chamber C flows into cylinder 31.
, 32, 33, each cylinder exerts a large force on the outside. The F chamber is opened to the atmosphere through a fluid passage 19, a tube 21, and a four-way solenoid valve 20. Next, the return will be explained. Four-way solenoid valve 20
, and supplies air to the tube 21 (29 in FIG. 3). The tube 22 (28 in FIG. 3) is opened to the atmosphere, and air passes through the fluid passage 19 to pressurize the F chamber. The air in the D chamber passes through the fluid passage 18, the tube 23, the fluid passage 16, the expanded E chamber, the fluid passage 15, the tube 22, and the solenoid valve 20, and is released to the atmosphere. Also, due to the pressurization of the F chamber, the pressure boosting piston 5 and the ram 7 move in the J direction, and the liquid passage is opened, and the pistons 34, 35, and 36 are pressurized due to the tube 29. , the oil supplied to the cylinders 31, 32, and 33 passes through the liquid supply tube 30 and moves to the C chamber, the oil in the C chamber moves to the B chamber, and the floating piston 4 moves in the H direction to move to the C chamber. It returns as shown in Figure 1. Sho Ram 7,
During the movement in the H direction, when the pressure in the C chamber decreases and the valve body 8 moves in the H direction, the air in the D chamber is directly released to the atmosphere through the G chamber and the exhaust port 17. .

As explained above, the feature of the present invention is that when an external force increases, the built-in valve mechanism operates according to the change in pressure accompanying the increase in external force, and automatically pressurizes the pressure booster piston to supply high-pressure liquid. It is to supply.

In addition, it is also possible to shut off the liquid passage using only the valve body.
An example of this is shown in FIG. The movement of the valve body 25 due to changes in pressure closes off the liquid passage 26, and one valve body opens the fluid passage for pressurizing the pressure boosting piston and shuts off the liquid passage. Also, for blocking liquid passages,
It is easy to use a ram and a partition block, and the liquid passage and secondary liquid chamber can be separated by a partition block.
Utilizing the fact that the ram passes through the partition block, a sealing device such as an O-ring or U-packing is provided on the partition block, and the passage of the ram through the sealing device closes the liquid passage and the secondary liquid chamber. This is to block the

In the explanation so far, air was assumed to be the supply fluid, but
Even when low-pressure oil is used as the supply fluid, the same effect as described above can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the embodiment, Fig. 2 is a partial sectional view, and Fig. 3 is a longitudinal sectional view of the embodiment.
The figure shows an example of the use of the invention. 1, 2, 3, ... 1st, 2nd, 3rd cylinder, 4 ... Idle piston, 5 ... Pressure increase piston, 6, ... Liquid supply port,
7... Ram, 8, 25... Valve body, 9... Spring, 10...
Partition block, 14, 26...Liquid passage 15, 16...
Fluid passage, 30...Liquid supply tube, 31, 32, 3
3... indicates a cylinder. Patent applicant Masafumi Isobe

Claims (2)

[Claims] (1) A floating piston fitted between the first and second cylinders and operated by fluid pressure; a second cylinder communicating with the first and second cylinders via a liquid passage; and the first and second cylinders. a pressure booster piston fitted in the third cylinder and operated by fluid pressure; and a partition wall that is integrated with the pressure booster piston and has a smaller diameter than the pressure booster piston. A ram that penetrates the block and protrudes into the second cylinder to close the fluid passage, and a ram that is activated by a change in pressure to open the fluid passage that pressurizes the pressure booster piston, is returned by a spring, and is fitted into the bulkhead block. A cylinder device characterized in that it is equipped with a valve body. (2) A floating piston fitted between the first and second cylinders and operated by fluid pressure, a second cylinder communicating with the first and second cylinders via a liquid passage, and the first and second cylinders. a pressure booster piston fitted in the third cylinder and operated by fluid pressure; and a partition wall that is integrated with the pressure booster piston and has a smaller diameter than the pressure booster piston. A ram penetrates the block and protrudes into the second cylinder, and is actuated by changes in pressure to open a fluid passage that pressurizes the pressure booster piston, closes the liquid passage, returns to actuation by a spring, and is fitted into the bulkhead block. A cylinder device characterized in that it is equipped with a valve body.