JPS6150161B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air-oil pressure boosting cylinder device used, for example, in drilling, caulking, plastic processing machines, and the like.

[Conventional technology]

This type of cylinder device is disclosed in Japanese Patent Publication No. 53-70, and is capable of making the operation stroke sufficiently large and outputting a large force when required, while being able to act quickly in other cases. As can be done 2
Works in stages. By the way, the cylinder device disclosed in the publication is not necessarily preferable because it requires the provision of a switching valve for transitioning from one stage of operation to another stage of operation and a control device for controlling this.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above points,
The purpose is to eliminate the switching valve,
It is an object of the present invention to provide an air-oil pressure boosting cylinder device that can perform required operations with a simple configuration.

[Means for solving problems]

According to the present invention, the above-mentioned objects include: a free piston fitted in a cylinder and actuated by air pressure introduced into one end surface; A first air passage provided therein, a liquid chamber formed in the cylinder together with the free piston, and a piston for actuating the operated movement actuated by the hydraulic pressure generated in the liquid chamber; a defining member defining a first liquid chamber on the piston side and a second liquid chamber on the free piston side and forming a liquid passage communicating these two liquid chambers; The free piston is disposed in the liquid chamber by passing through the free piston in an airtight and slidable manner through the end surface and the other end surface of the free piston opposite to the one end surface, and is disposed in the liquid chamber on the other end surface opposite to the one end side. It is actuated by the introduced air pressure to close the liquid passage to prevent the free piston from moving toward the operated piston, and to generate liquid pressure in the first liquid chamber after the liquid passage is closed. An air actuated piston, a second air passage provided in the cylinder for introducing air pressure into the other end surface of the air actuated piston, and an axial pressure receiving surface for the air pressure introduced into the second air passage. and a substantially smaller amount of compressed air than the amount of compressed air introduced into one end surface of the free piston by said first air passage when the air actuated piston is set in the position opening the liquid passage. a restriction provided in the air-operated piston to form a restriction passage between the other end surface of the air-operated piston in the second air passage and the pressure receiving surface through which air is introduced to the other end surface of the air-operated piston; Achieved by an air-oil pressure boosting cylinder device comprising a passage forming member, wherein the pressure receiving area of the pressure receiving surface of the throttle passage forming member is smaller than the axial pressure receiving area of the liquid chamber of the air actuated piston. be done.

[Action and effect]

In the air-oil pressure boosting cylinder device according to the present invention, the throttle passage forming member provided on the air-operated piston has a pressure receiving surface in the axial direction with respect to the air pressure introduced into the second air passage, and The second air passage includes a constriction passage such that a substantially smaller amount of compressed air is introduced into the other end face of the air actuated piston than the amount of compressed air introduced into one end face of the free piston by the first air passage. Since the free piston is formed between the other end surface of the air actuated piston and the pressure receiving surface, even when compressed air is supplied to the first and second air passages through one electromagnetic valve, the free piston is Even if the piston starts to operate with compressed air supplied from the air passage, the air pressure acting on the other end surface of the air-operated piston does not substantially increase;
In the air-oil pressure booster cylinder device of the present invention, the pressure receiving area of the pressure receiving surface of the throttle passage forming member is smaller than the axial pressure receiving area of the liquid chamber of the air actuated piston. When each pressure receiving surface receives compressed air supplied from the air passage, the force acting on the axial pressure receiving surface in the liquid chamber of the air actuating piston is greater than the force acting on the pressure receiving surface of the throttle passage forming member. The air-operated piston is thus ensured to remain stationary.

As described above, in the air-oil pressure booster cylinder device of the present invention, by forming the throttle passage with the above-described configuration, it is possible to delay the high-pressure feeding operation than the high-speed feeding operation, thereby making it possible to perform a single switching operation. This allows the valve to be operated.

〔Example〕

A preferred specific example of the present invention will be explained based on the drawings.

In the figure, inside the cylinder 1 are a piston 2,
3.50 is fitted. air actuated piston 5
0 is composed of a first piston portion 4 having a relatively large diameter and a relatively short length, and a second piston portion 18 having a relatively small diameter and a relatively long length. A rod 5 is attached to the operated piston 2, and the rod 5 slidably passes through a rod guide 6 and projects to the outside. The annular chamber 7 formed between the piston 2 and the guide 6
It communicates with the outside through a through hole 8 bored in the chamber 7, and a coil spring 9 is mounted in the chamber 7 to bias the piston 2 in the direction B.

A chamber 10 in the cylinder 1 formed between the free piston 3 and the piston 2 is filled with oil, and the chamber 10 is defined by an annular defining member 11 into a chamber 12 serving as a first liquid chamber. and a chamber 13 serving as a second liquid chamber. The defining member 11 is fixed to the cylinder 1 so as not to move by being sandwiched between retaining rings 14 and 15 attached to the cylinder 1. The central hollow part of the defining member 11 has chambers 12 and 13.
A passage 16 is formed as a liquid passage that communicates with the two. Piston 2 and rod 5 open into chamber 12
A recess 17 is formed in the recess 17.
A second piston portion 18 protruding toward the chamber 12 is inserted. Member 1 attached to cylinder 1
9 defines a chamber 19a in the cylinder 1 defined between the piston 3 and the first piston part 4 into two air chambers 20 and 21, and the member 19 has a second air chamber 20 and a second air chamber 21, which are open to the chamber 20. An air supply hole 22 serving as an air passage for one air passage also opens into the chamber 21 and an air discharge hole 23 opens into the chamber 21.
are drilled in each. Piston 3 and member 19
The second piston part 18 that slidably passes through the piston part 18 is connected to the first piston part 4 via a stop ring 24, and the piston 2 of the second piston part 18 is connected to the first piston part 4 through a stop ring 24.
An axial pressure receiving surface 18c for the oil in the liquid chamber 12 is provided at the end of the side. A lid 25 that closes one end surface of the cylinder 1 is provided with an air supply hole 27 that opens into a chamber 26 inside the cylinder 1 that is defined by the first piston portion 4 and the lid 25 . A small diameter portion 28b having a diameter 28a smaller than the diameter 28 of the main body portion of the second piston portion 18 is provided at the tip of the second piston portion 18 on the side of the first piston portion 4, and serves as a restricting passage forming member. The small diameter portion 28b protrudes from one end surface of the first piston portion 4, and is inserted into the hole 27 when the first piston portion 4 is in contact with the lid 25. In the hole 27 as the second air passage, the small diameter portion 28b and the lid 2
An annular gap 29 is formed between the small diameter portion 28b and the hole 27, and when the small diameter portion 28b is inserted into the hole 27, the chamber 2
6 and the external opening side of the hole 27 are in communication with each other,
A pressure receiving surface 28c in the axial direction relative to the air in the air supply hole 27 is provided at the tip of the small diameter portion 28b. The holes 22, 23 and 27 can be communicated with a compressed air source 31 via a solenoid valve 30.

In the air-oil booster cylinder device configured in this way, the electromagnetic valve 30 is not excited, the holes 22 and 27 are opened to the atmosphere via the electromagnetic valve 30, and the hole 23 is used to generate compressed air via the electromagnetic valve 30. When connected to the source 31, compressed air is supplied to the chamber 21, the first piston portion 4 contacts the lid 25, and the small diameter portion 28b is inserted into the hole 27, while the piston 2 is attached to the spring 9. Retaining ring 14
The piston 3 is in contact with the member 19 . In this state, the length of the rod 5 protruding from the guide 6 to the outside is minimized, and the passage 16 is not blocked by the second piston part 18 and the chamber 12 is closed.
and chamber 13 are communicated with each other. Next, the electromagnetic valve 30 is energized, and the holes 22 and 27 are supplied with compressed air from the compressed air source 31, while the holes 23 are opened to the atmosphere via the electromagnetic valve 30.
0 is supplied with compressed air, and compressed air is gradually supplied to the chamber 26 through the gap 29, while the compressed air in the chamber 21 is discharged to the outside. room 2
The piston 3 is moved in the direction A by the supply of compressed air to the passage 1, and at the same time, the oil in the chamber 13 is moved to the passage 1.
The piston 2 is also moved in the direction A against the extension force of the spring 9 due to the oil pressure based on the oil supplied to the chamber 12 via the rod 5.
are successively and rapidly projected to the outside via the guide 6.

On the other hand, since compressed air is gradually supplied to the chamber 26, when the supply of compressed air to the hole 27 is started, the first
Only the force in the A direction due to the pressure-receiving area of the small diameter portion 28b acts on the piston portion 4, and the first piston portion 4 is blocked by the force in the B direction applied to the second piston portion 18 due to the oil pressure in the chamber 13. It remains in contact with the lid 25. Thereafter, the compressed air pressure in the chamber 26 increases, and this increased compressed air pressure acts on the entire one end surface of the first piston part 4, so that the force in the A direction acting on the first piston part 4 is greater than the force in the B direction. When the first piston part 4 becomes larger, the first piston part 4 moves in the A direction, and along with this, the second piston part 18 also moves in the A direction,
The small diameter portion 28b exits through the hole 27, and compressed air is supplied from the hole 27 to the chamber 26 without resistance. Then, when the second piston part 18 is inserted into the passage 16, communication between the chambers 12 and 13 through the passage 16 is blocked, and the supply of oil from the inside of the chamber 13 to the inside of the chamber 12 is stopped. Movement of the piston 3 in the A direction is prevented. Thereafter, since the second piston part 18 extends into the chamber 12 through the passage 16, the second piston part 18 generates hydraulic pressure in the chamber 12, and the piston 2 further moves in the direction A due to the generated hydraulic pressure. will be moved to Here, since the diameter 28 of the second piston part 18 is smaller than the diameter 40 of the piston 2, the force due to the compressed air pressure supplied to the hole 27 is increased and transmitted to the piston 2, and the rod 5 The applied force is used, for example, to perform a pressing operation in pressing or molding. When the electromagnetic valve 30 is de-energized after the pressing operation, the holes 22 and 27 are opened to the atmosphere, while compressed air is supplied to the chamber 21 through the hole 23, so that the second piston portion 18 and The first piston part 4 is moved in the direction B and the first piston part 4
contacts the lid 25, and the small diameter portion 28b is inserted into the hole 27. Further, from the passage 16 to the second piston portion 18
is removed, so chambers 12 and 13 are in communication,
The piston 2 is urged by the spring 9 and moves in the B direction, and at the same time, the oil in the chamber 12 is returned to the chamber 13, and the piston 3 is moved in the B direction until it comes into contact with the member 19.

Incidentally, in the above-mentioned specific example, a device consisting of a single cylinder was explained, but the present invention is not limited to this, and can also be applied to a device consisting of a double cylinder as disclosed in Japanese Patent Publication No. 53-70, for example. applicable.
In addition, the spring 9 does not necessarily need to be provided, and compressed air may be supplied to the chamber 7 to return the piston 2 to its original position.

As described above, according to the present invention, since operation can be performed with a single switching valve, the control device can be simplified, and in addition, high-speed feeding operation and high-pressure feeding operation can be performed reliably without malfunction. . On top of that,
When configured as in the specific example, it is possible to configure the cylinder without duplicating it, making it easy to manufacture and providing a low-cost cylinder device.

[Brief explanation of the drawing]

The figure is an explanatory diagram of a preferred specific example according to the present invention. 1...Cylinder, 2,3,50...Piston,
4...First piston part, 12, 13... Chamber, 1
6... Passage, 18... Second piston part, 27...
...hole, 28b...small diameter part.

Claims (1)

[Claims] 1 a free piston fitted in a cylinder and actuated by air pressure introduced into one end surface; a first air passage provided in the cylinder to introduce the air pressure into one end surface of the free piston; A liquid chamber is formed in the cylinder together with the free piston, and the operated piston is actuated by the hydraulic pressure generated in the liquid chamber, and the liquid chamber is connected to a first liquid chamber on the side of the operated piston. a second liquid chamber on the piston side, and a second liquid chamber on the piston side.
a defining member forming a liquid passage that communicates two liquid chambers, and one end side of which allows the free piston to airtightly and freely slide through the one end surface of the free piston and the other end surface of the free piston opposite to the one end surface. The liquid passage is disposed through the liquid chamber and is actuated by air pressure introduced to the other end surface opposite to the one end side to close the liquid passage and close the liquid passage on the operated piston side of the free piston. an air-operated piston that prevents movement of the air-operated piston and generates liquid pressure in the first liquid chamber after the liquid passage is closed; and an air passage, and a pressure receiving surface in the axial direction for the air pressure introduced into the second air passage, and when the air actuated piston is set to a position where the liquid passage is opened, the first air The air actuation in the second air passage is such that a substantially smaller amount of compressed air is introduced into the other end face of the air actuated piston than the amount of compressed air introduced into one end face of the free piston by the passage. a throttle passage forming member provided on the air-operated piston to be formed between the other end surface of the piston and the pressure-receiving surface, and the pressure-receiving area of the pressure-receiving surface of the throttle passage-forming member An air-oil pressure boosting cylinder device characterized in that the area is smaller than the axial pressure receiving area in the chamber.