JP2955220B2 - In-line pressure booster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-line pressure-intensifying device used for operating a hydraulic cylinder.

[0002]

2. Description of the Related Art Conventionally, fluid pressure cylinders have been used for moving and lifting various works.

For example, when a work is moved by a pneumatic cylinder, the thrust of the pneumatic cylinder is most required at the moment when the work or the piston of the pneumatic cylinder shifts from a stationary state, which is stable due to static friction, to a moving state. is there.

[0004] Conventionally, the inner diameter of the pneumatic cylinder and the supply pressure are determined based on the maximum thrust required at that time.

[0005]

Therefore, in the prior art, during normal operation, which occupies most of the operation period of the pneumatic cylinder, the pneumatic cylinder operates with a thrust smaller than the maximum thrust. Similarly, during normal operation, it is operating at a pressure lower than the supplied pressure.

As described above, conventionally, the thrust and the supply pressure of the pneumatic cylinder are not effectively used, and the compressed air is wasted. The present invention
In view of the above-mentioned problem, it is possible to use a hydraulic cylinder having an inner diameter smaller than the inner diameter of a conventionally used hydraulic cylinder, thereby reducing the amount of pressurized fluid for energy saving. It is an object of the present invention to provide an in-line pressure intensifier capable of performing the following.

[0007]

According to the first aspect of the present invention, there is provided an apparatus comprising: a first cylinder tube formed by a first cylinder tube;
Of the first cylinder chamber,
A first piston that is divided into a first fluid chamber and a second fluid chamber, and the first piston that is formed by a second cylinder tube.
A second piston that slides in a second cylinder chamber having a diameter larger than that of the first cylinder chamber and divides the second cylinder chamber into a third fluid chamber and a fourth fluid chamber; A rod connecting the piston and the second piston to each other so as to move integrally, a first port provided to open to the first fluid chamber, the second port; A second port provided to open to the fluid chamber and selectively opening to the first fluid chamber or the second fluid chamber according to a stroke position of the first piston; As described above, the third port provided between the first port and the second port, and when the pressure fluid is supplied, the rod is moved in the same direction as that of the first fluid chamber. A fourth port opening to a third fluid chamber to be moved; A communication passage connecting the first port and the fourth port, a throttle flow path connecting the first port and the third port, and a second port and the third port. And a check valve which is provided between the third port and flows freely from the third port toward the second port.

According to a second aspect of the present invention, the fourth fluid chamber is provided with a compression spring for urging the second piston toward the third fluid chamber. An apparatus according to a third aspect of the present invention is provided with a check valve that is free-flowing from the first port toward the third port in parallel with the throttle channel.

The operation of the in-line pressure intensifier configured as described above will be described with reference to FIG. FIG.
The operation (pulling operation) when the pneumatic cylinder 2 performs the contracting operation from the state shown in FIG.

By switching the switching valve 3,
The compressed air supplied from the compressed air source 8 passes through the flow path 65, the check valve 64, and the speed controller 6 of the in-line pressure intensifier 5, and passes through the port 2a to the rod-side chamber 2AA.
Flows into. As a result, the piston of the pneumatic cylinder 2 moves and the work W moves to the left in the figure. If the work W does not move due to insufficient thrust, the in-line pressure-intensifying device 5 operates as follows. Operate.

That is, first, the compressed air flows into the second fluid chamber 43 from the second port 52 and the third port 53 and fills the second fluid chamber 43. Further, the compressed air flows from the first port 51 and the fourth port 54 into the first fluid chamber 42 and the third fluid chamber 45 through the throttle channel 62 and the communication path 61, and the fluid chambers 42 and 45 are filled.

Therefore, the thrust of the compressed air filled in the first fluid chamber 42 and the third fluid chamber 45 is equal to the thrust of the compressed air filled in the second fluid chamber 43 and the thrust of the compression spring 29. Since the resultant thrust is overcome, the first piston 24 moves to the right in the figure.

The movement of the first piston 24 causes the first
When the piston 24 passes through the position of the third port 53 to the right, the supply of the compressed air to the second fluid chamber 43 is interrupted, and the rod-side chamber 2AA of the pneumatic cylinder 2, the second fluid chamber 43, and The whole, including the volume of the flow path between them, becomes a pressurized chamber, and the compressed air existing there is the first piston 2
4 is pressed by the movement. Note that the check valve 64 is closed by a pressure increase due to pressurization.

Since the pressures in the second fluid chamber 43 and the rod-side chamber 2AA increase, the thrust of the pneumatic cylinder 2 increases, the piston of the pneumatic cylinder 2 moves, and the work W moves to the left in the drawing. When the piston moves, the volume of the rod-side chamber 2AA increases, thereby decreasing the pressure. When the pressure of the second fluid chamber 43 becomes lower than the pressure of the compressed air source 8, the check valve 64 opens, and the rod-side chamber 2 of the pneumatic cylinder 2 passes through the check valve 64 from the flow path 65.
The supply of compressed air to AA is continued.

[0015]

FIG. 1 is a diagram showing the configuration of an in-line pressure booster 5 according to the present invention, and FIG. 2 is a diagram showing an example of a cylinder circuit 1 using the in-line pressure booster 5 according to the present invention. .

The in-line pressure-intensifying device 5 includes a pressure-increasing cylinder device 11 and a fluid device 12 connected to the pressure-increasing cylinder device 11. The booster cylinder device 11
The first piston 24 that slides in a first cylinder chamber 41 formed by the cylinder tube 21 and divides the first cylinder chamber 41 into a first fluid chamber 42 and a second fluid chamber 43 The second cylinder chamber 44 is slid in a second cylinder chamber 44 formed by the second cylinder tube 23 and having a diameter larger than that of the first cylinder chamber 41.
Piston 26, first piston 24 and second piston 26, which are divided into a fluid chamber 45 and a fourth fluid chamber 46
And a first port 51 provided to open to the first fluid chamber 42 and an opening to the second fluid chamber 43 so as to move together. Port 52 provided as described above, a third port 53 provided between the first port 51 and the second port 52, and a third fluid chamber 45 are provided so as to open. A fourth port 54, an exhaust hole 55 provided to open to the fourth fluid chamber 46, a compression spring 29 provided in the fourth fluid chamber 46, and the like.

A cover member 22 is provided between the first cylinder tube 21 and the second cylinder tube 23, and these are integrally connected to each other by bolts (not shown). The first piston 24 and the second piston 26 are provided with cushion members 27 and 28 for reducing an impact at a stroke end.
The first piston 24, the second piston 26, and the cover member 22 are provided with packings for maintaining airtightness with other members.

The movement of the first piston 24 causes the third port 53 to selectively open to the first fluid chamber 42 or the second fluid chamber 43. The compression spring 29 is
Is urged toward the third fluid chamber 45.

The fluid device 12 includes a first port 51 and a fourth port 51.
Communication path 61 communicating with the port 54 of the first port 5
A throttle channel 62 connecting between the first and third ports 53,
Check valve 6 that is connected in parallel with throttle channel 62 and is free flowing from first port 51 toward third port 53.
3 and a check valve 64 that is provided between the second port 52 and the third port 53 and that flows freely from the third port 53 toward the second port 52.
The throttle channel 62 and the check valve 63 are integrated as a speed controller.

Referring particularly to FIG.
Is connected between the port 2 a on the rod side of the pneumatic cylinder 2 and the switching valve 3 to increase the thrust on the pulling side of the pneumatic cylinder 2. Speed controllers 6 and 7 each having a throttle valve and a check valve connected in parallel are connected to the ports 2 a and 2 b of the pneumatic cylinder 2.

Next, the operation and operation of the in-line pressure increasing device 5 in the cylinder circuit 1 shown in FIG. 2 will be described.
First, the operation (pulling operation) when the pneumatic cylinder 2 performs the contracting operation from the state shown in FIG. 2, that is, the state where the pneumatic cylinder 2 is expanded will be described.

By switching the switching valve 3,
The compressed air supplied from the compressed air source 8 passes through the flow path 65 of the in-line pressure intensifier 5, passes through the check valve 64,
It passes through the speed controller 6 and flows into the rod side chamber 2AA of the pneumatic cylinder 2 from the port 2a. As a result, the piston of the pneumatic cylinder 2 moves and the work W moves to the left in the figure. If the work W does not move due to insufficient thrust, the in-line pressure-intensifying device 5 operates as follows. Operate.

That is, first, the compressed air flows into the second fluid chamber 43 from the second port 52 and the third port 53 and fills the second fluid chamber 43. Further, the compressed air flows from the first port 51 and the fourth port 54 into the first fluid chamber 42 and the third fluid chamber 45 through the throttle channel 62 and the communication path 61, and the fluid chambers 42 and 45 are filled.

Therefore, the thrust of the compressed air filled in the first fluid chamber 42 and the third fluid chamber 45 is equal to the thrust of the compressed air filled in the second fluid chamber 43 and the thrust of the compression spring 29. Since the resultant thrust is overcome, the first piston 24 moves to the right in the figure. In addition, the first fluid chamber 42 and the third
The first piston 24 moves after the second fluid chamber 43 is completely filled with the compressed air since the flow path to the fluid chamber 45 is restricted by the restricting flow path 62.

The movement of the first piston 24 causes the first
When the piston 24 passes through the position of the third port 53 to the right, the supply of the compressed air to the second fluid chamber 43 is interrupted, and the rod-side chamber 2AA of the pneumatic cylinder 2, the second fluid chamber 43, and The whole, including the volume of the flow path between them, becomes a pressurized chamber, and the compressed air existing there is the first piston 2
4 is pressed by the movement. Note that the check valve 64 is closed by a pressure increase due to pressurization.

Since the pressures of the second fluid chamber 43 and the rod-side chamber 2AA increase, the thrust of the pneumatic cylinder 2 increases, and the piston of the pneumatic cylinder 2 moves to move the work W to the left in the drawing. When the piston moves, the volume of the rod-side chamber 2AA increases, thereby decreasing the pressure. When the pressure of the second fluid chamber 43 becomes lower than the pressure of the compressed air source 8, the check valve 64 opens, and the rod-side chamber 2 of the pneumatic cylinder 2 passes through the check valve 64 from the flow path 65.
The supply of compressed air to AA is continued. Thereby, the pneumatic cylinder 2 continues the contracting operation and reaches the stroke end.

Next, the operation (push operation) when the pneumatic cylinder 2 performs the extension operation from the contracted state of the pneumatic cylinder 2 will be described. When the switching valve 3 is switched to the state shown in FIG. 2, the compressed air remaining in the first fluid chamber 42 and the third fluid chamber 45 is discharged to the check valve 63.
Then, the air is exhausted to the atmosphere through the communication passage 61. As a result, the thrust of the second piston 26 is lost, and the second piston 26 is moved to the left stroke end by the compression spring 29.

The pneumatic cylinder 2 has a port 2 on the cover side.
The extension operation is performed by the compressed air supplied from b to the cover side chamber 2BB, and the work W is moved rightward in the drawing. In the case of the extension operation, since the pressure receiving area of the piston is large, the work W moves only by the pressure of the compressed air source 8.

The compressed air exhausted from the port 2 a by the extension operation of the pneumatic cylinder 2 flows into the second fluid chamber 43 through the flow path 66 and the second port 52. First
When the first piston 24 passes through the position of the third port 53 to the left due to the movement of the piston 24, the compressed air flowing into the second fluid chamber 43 passes through the third port 53 and the flow path 65. Exhausted. This results in the initial state shown in FIG.

As described above, at the start of the pulling operation requiring the largest thrust and pressure in the pneumatic cylinder 2, the pressure of the compressed air of the compressed air source 8 is increased by the in-line pressure intensifier 5 and is higher than that. Pressurized compressed air is supplied to the pneumatic cylinder 2. As a result, the pneumatic cylinder 2 performs a stable contracting operation, and performs a normal operation with the compressed air from the compressed air source 8 in other operations. That is, even if the inner diameter of the pneumatic cylinder 2 is made smaller than before and the pressure of the compressed air of the compressed air source 8 is set lower than before, the pneumatic cylinder 2 can operate without any trouble. Therefore, during normal operation, the thrust of the pneumatic cylinder 2 and the compressed air of the compressed air source 8 are effectively used, and wasteful consumption of the compressed air is reduced. As a result, the amount of compressed air used is reduced. Energy saving.

In the in-line pressure-intensifying device 5, the first cylinder tube 21 and the second cylinder tube 23 are integrally connected, but may be formed separately. The communication passage 61 may be provided inside the pressure-intensifying cylinder device 11, for example, in the second cylinder tube 23. The throttle passage 62, the check valves 63 and 64, and the like may be built in the pressure-intensifying cylinder device 11, for example, in the first cylinder tube 21. In addition, cylinder circuit 1, in-line pressure booster 5
The structure, shape, dimensions, material, and the like of the whole or each part can be appropriately changed in accordance with the gist of the present invention.

[0032]

According to the first to third aspects of the present invention,
It is possible to use a fluid pressure cylinder having an inside diameter smaller than the inside diameter of a conventionally used fluid pressure cylinder, and it is possible to reduce the amount of pressurized fluid used and save energy.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an in-line pressure booster according to the present invention.

FIG. 2 is a diagram showing an example of a cylinder circuit using an in-line pressure booster according to the present invention.

[Explanation of symbols]

 5 In-line pressure booster 11 Pressure booster cylinder 21 First cylinder tube 23 Second cylinder tube 24 First piston 25 Rod 26 Second piston 29 Compression spring 41 First cylinder chamber 42 First fluid chamber 43 2nd fluid chamber 44 2nd cylinder chamber 45 3rd fluid chamber 46 4th fluid chamber 51 1st port 52 2nd port 53 3rd port 54 4th port 61 communication channel 62 throttle channel 63, 64 Check valve

Claims (3)

(57) [Claims] 1. A first piston sliding in a first cylinder chamber formed by a first cylinder tube to divide the first cylinder chamber into a first fluid chamber and a second fluid chamber. And sliding in a second cylinder chamber formed by a second cylinder tube and having a diameter larger than the first cylinder chamber, and dividing the second cylinder chamber into a third fluid chamber and a fourth fluid chamber. A second piston that divides the first piston into a first fluid chamber; a rod that connects the first piston and the second piston to each other so that the first piston and the second piston move integrally; A first port provided, a second port provided to open to the second fluid chamber, and the first port according to a stroke position of the first piston.
A third port provided between the first port and the second port so as to selectively open with respect to the fluid chamber or the second fluid chamber; A fourth port that opens to a third fluid chamber that moves the rod in the same direction as the first fluid chamber when the first fluid chamber is in contact with the first fluid chamber; and a communication between the first port and the fourth port. A communication path, a throttle channel connecting between the first port and the third port, and a third port provided between the second port and the third port. And a check valve that is free-flowing from the second port toward the second port. 2. The in-line pressure booster according to claim 1, wherein a compression spring for urging the second piston toward the third fluid chamber is provided in the fourth fluid chamber. . 3. The in-line increase valve according to claim 1, wherein a check valve is provided in parallel with the throttle passage so as to flow freely from the first port toward the third port. Pressure device.