JPS6224005A - Cylinder device - Google Patents

Abstract

PURPOSE:To simplify the structure and to reduce the size of the captioned device by inserting a hollow rod of a pressure intensifying piston into a main rod of a main piston so that the hollow rod can slide freely in the main rod together with providing a valve body in the hollow rod. CONSTITUTION:A cylinder is partitioned by a partitioning wall 7 into the first cylinder 1 and the second cylinder 2. A main piston 4 is inserted into the second cylinder 2, while both a pressure intensifying piston 5 and a floating piston 19 are inserted into the first cylinder 1. In addition, a hollow rod 6 of the pressure intensifying piston 5 is inserted into a main rod 3 of the main piston 4 in a freely slidable manner, while a valve body, which is operated by pressure, is provided in the hollow rod 6. With this contrivance, it becomes possible that the main piston 4 is operated at a high speed usually, while the piston 4 is operated automatically, outputting the large power, when necessary. Thus, the structure of the captioned device can be simplified, and the size can be made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a pneumatic hydraulic press that produces large output when necessary during movement, such as punching presses and camming operations, and is used in equipment that requires speed in other cases. This relates to cylinder devices and hydraulic cylinder devices that can produce high output using low-pressure oil.It has a relatively simple structure, is compact, satisfies the above requirements, and can be used at any position during the cylinder stroke. This cylinder device is characterized by being able to automatically obtain high output when In the middle of the process, adjust the position of the cylinder that outputs high output, or switch from low output to high output by using a limit switch, etc. to indicate the position of the non-processed material and switching the solenoid valve. The purpose is to eliminate the inconvenience, inefficiency, and uneconomical effects associated with installing limit switches, etc.

An embodiment of the present invention will be described with reference to FIG. Generally, compressed air (hereinafter referred to as air) is used as the supply fluid and oil is used as the liquid, so in the following explanation, the supply fluid is air and the internal liquid is oil.

A. C. is the first cylinder supply fluid chamber (hereinafter referred to as A.C chamber)
B is the first cylinder liquid chamber (hereinafter referred to as B chamber), D is the second cylinder liquid chamber (hereinafter referred to as D chamber), E is the second cylinder supply fluid chamber (hereinafter referred to as E chamber), and F is the third cylinder liquid chamber (hereinafter referred to as F chamber).
chamber), 1.2.3 is the 1.2.3 cylinder, and the third cylinder is the main piston 4. The other end is sealed to transmit the pressing force to the outside. Reference numeral 5 denotes a pressure increasing piston, which has greater sliding resistance than the main piston 4. Reference numeral 6 denotes a hollow rod, which is integrated with the pressure increasing piston 5, penetrates the partition wall block 7, and is fitted into the third cylinder 3. There is. Further, a valve body 8 is fitted in the hollow portion with the liquid passage 10 open.

In addition, the valve body 8 is fitted into the liquid passage 12, and the valve body ■
The area a of the piston part, the area a1 of the tip piston part, the pressure in the B chamber P, the pressure in the F chamber P1, the first piston 1 and the third piston
If the area ratio of the piston 3 is b and the sliding resistance of the valve body is f, then ap+f=a1p1=a1bPFrom this, P=f/(
Since the liquid pressure in chambers B and F is balanced by a, b-a), P>f/(a1b-a), a, a1
, b, f. 9 is a spring whose purpose is to return the moved valve body to its original position. The passage 11 communicates with chambers F and D, and is made sufficiently smaller than the area of the third cylinder. The passage 12 is formed so that the tip of the valve body 8 fits therein. 19 is a floating piston in the first cylinder 1
It can slide freely depending on the pressure difference between the supply fluid in chamber A and the liquid in chamber B. 13 and 14 are cover blocks, 1
8 is a liquid passage in the hollow part of the hollow rod 6; 15, 16;
, 17 are supply fluid inlet and outlet passages.

Next, the operation of the cylinder device configured as above will be explained. FIG. 1 shows the state before operation. Suppose that the external force is now small.

Air is supplied from the passage 15. It is assumed that the passages 16 and 17 are open to the atmosphere. The floating piston 19 is pressurized by the air entering the A chamber. The oil in chamber B is pressurized via the floating piston 19. B, D, F chambers are liquid passage 1
8, 10, 11, and 12, oil pressure is applied to the pressure booster piston 5 and the main piston 4. However, since the sliding resistance of the pressure booster piston 5 is greater than that of the main piston 4, the pressure booster piston 5 and the hollow rod 6 do not move, and only the main piston and the third cylinder 3 move to the left in the figure. Moving. Due to the enlargement of the F chamber, oil flows from the D chamber through the liquid passages 11 and 12. At this time, since the area of the third cylinder 3 is much larger than the area of the liquid passage 11, the pressure in the F chamber becomes negative with respect to the D chamber due to the oil flow resistance. Since chambers D and F communicate with each other, a pressure difference is generated between chambers B and F, and the valve body 8 moves to the left in the diagram, as shown in FIG. will be cut off. Even if the supply fluid pressure increases and the pressure booster piston 5 starts to move, P<f/(a1b-a) calculated above.
Under the conditions of , the liquid passage 12 remains closed and the F chamber is sealed.

Next, suppose that the external force becomes large, the pressures in chambers F and B rise rapidly, and at the point P>f/(a1b-a), the liquid passage 12 opens, and the valve body 8 moves to the right in the figure. move, compress the spring 9, and move further to the right, as shown in Figure 3, and the F and D chambers are
The chambers are communicated by liquid passages 12 and 11, and chamber B and chamber D are isolated. In other words, chamber D and chamber F are communicated and sealed,
High pressure proportional to the area ratio of the first and third cylinders is generated in chambers F and D according to Pascal's principle, applying a large force to the main piston 10 and transmitting a large pressing force to the outside. I can do it. Next, recovery will be explained. The passage 15 is opened to the atmosphere, and air is supplied from passages 16 and 17.

The main piston 4 and the pressure booster piston 5 move to the right in the figure, and the floating piston 19 also moves to the right in the figure depending on the oil pressure in the B chamber and the amount of oil. As the oil pressure in the F chamber decreases, the valve body 8 moves to the left in the figure by the spring 9.
Finally, the process returns as shown in FIG.

In the above description, air is used as the supply fluid and oil is used as the internal liquid. However, if the supply fluid is oil, the floating piston 19 is not necessary, and the oil can be directly supplied to the B chamber. In FIG. 1, the sliding resistance of the valve body 8 is as follows:
The sliding friction force of the D-ring of the sealing material is assumed. Figure 4 shows an example in which the attractive force of a magnet is used for sliding resistance.

A magnet 20 is shown attracting the valve body 21 that is in close contact with the magnet. Also, the sliding resistance of the pressure booster piston is assumed to be a friction resistance material at the piston contact part, but it is also possible to obtain resistance by inserting a coil spring between the partition wall block 7 and the pressure booster piston 5, etc. I can do it.

Another example of the use of this cylinder device is to put oil in the E chamber, use the oil for pressurization, and use the oil for pressure recovery.
In a cylinder that relies on air, the oil in chamber E is
By connecting the cylinder's oil chamber with a tube, low-pressure oil can be rapidly supplied, and high-pressure oil can be automatically supplied when necessary. Further, this cylinder device can be easily applied by using a part of equipment of another device as the second cylinder.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the embodiment, FIGS. 2 and 3 are partial sectional views of FIG. 1, and FIG. 4 is a partial sectional view of the valve body using a magnet. 1.2.3... 1.2.3 cylinder, 4... Main piston, 5... Pressure booster piston, 6... Hollow rod, 7... Bulkhead block, 8.21.・Valve body, 9・
...Spring, 10.11.12.18...Liquid passage, 1
3.14...cover block, 15.16.17...
- Passage, 19... Idle piston, 20... Magnet.

Claims (1)

[Claims] The first, second, third
It operates via the liquid filled in the cylinder and the liquid passage communicating therewith, and returns to operation depending on the supply fluid, and is fitted into the second cylinder, operates via the liquid, and returns to operation depending on the supply fluid. A pressure booster piston with greater sliding resistance than the main piston. A hollow rod that is integrated with the pressure booster piston, passes through the partition wall block, is fitted into a third cylinder that is integrated with the main piston, and pressurizes the third cylinder via the liquid. A cylinder device comprising a valve body fitted into a hollow rod, operated by the pressure of the liquid to open and close a part of the liquid passage, and returned by a spring.