JP2001311404A - Exhaust gas recovering-devise for air cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust gas recovering-device for an air cylinder that can reduce air consumption by returning the exhaust gas of the cylinder to an air power supply and thus drive the cylinder at low cost. SOLUTION: This recovering-device is equipped with a three-port valve 20 and a booster valve 30. The three-port valve 20 releases lower pressure exhaust air to atmosphere and outputs higher one than a given pressure, from among exhaust air from the air cylinder 11. The booster valve 30 boosts the exhaust air outputted by the three-port valve 20, and then outputs the boosted air to an air power supply P for the cylinder 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic cylinder exhaust recovery apparatus for recovering exhaust air discharged from a pneumatic cylinder.

[0002]

2. Description of the Related Art Generally, a pneumatic system 10 shown in FIG.
Then, the piston is reciprocally driven by selectively applying the air pressure supplied from the air supply source P to the two pressure chambers defined by the pistons reciprocatingly sliding in the pneumatic cylinder 11 by means of the solenoid valve 12. Do
The air that is no longer needed after work is released into the atmosphere as exhaust air and discarded.

[0003]

By the way, in the pneumatic system 10, after the pneumatic cylinder 11 is driven, unnecessary exhaust air is discarded into the atmosphere. 11 increases the air consumption, and the air supply source P becomes the pneumatic cylinder 1
However, there is a problem that a large amount of air needs to be supplied to the power supply device 1, which increases power consumption and increases costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce air consumption by returning exhaust air from a pneumatic cylinder to an air supply source. An object of the present invention is to provide a pneumatic cylinder exhaust recovery device that can drive a pneumatic cylinder at low cost. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0005]

In order to achieve the above object,
The exhaust gas recovery apparatus for a pneumatic cylinder according to the present invention is configured to selectively apply air pressure to two pressure chambers defined by a piston, thereby allowing a predetermined pressure of the exhaust air discharged from the pneumatic cylinder reciprocatingly driving the piston. A three-port valve that discharges lower-pressure exhaust air into the atmosphere and outputs higher-pressure exhaust air than a predetermined pressure; and an air that increases the pressure of the exhaust air output from the three-port valve and supplies air pressure to the pneumatic cylinder. And a pressure-intensifying valve for outputting to a supply source.

Further, the exhaust gas recovery apparatus for a pneumatic cylinder according to the present invention selectively exhausts air from a pneumatic cylinder that reciprocates the piston by selectively applying air pressure to two pressure chambers defined by the piston. A three-port valve that discharges exhaust air having a pressure lower than a predetermined pressure into the atmosphere and outputs exhaust air having a pressure higher than a predetermined pressure to an air supply source that supplies air pressure to the pneumatic cylinder; And a pressure increasing valve for increasing the supplied air pressure and outputting the pressure to the pneumatic cylinder.

Therefore, according to the present invention, the exhaust air having a pressure higher than the predetermined pressure is output to the pressure intensifying valve by the three-port valve, so that the exhaust air can be easily raised to a pressure at which the exhaust air can be recovered by the air supply source. And exhaust gas can be collected.
In addition, since the air supplied from the air supply source is increased in pressure by the pressure increase valve and output to the pneumatic cylinder, the air pressure of the air supply source can be set low, so that a large amount of exhaust air can be collected in the air supply source Becomes

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. In describing the embodiments, those having the same functions will be denoted by the same reference numerals. FIG. 1 is a schematic configuration diagram of an exhaust gas recovery device for a pneumatic cylinder according to an embodiment of the present invention, FIGS. 2 and 3 are schematic diagrams and longitudinal sectional views of main parts of a pressure booster, and FIG. FIG. 5 and FIG. 6 are a schematic diagram and a vertical cross-sectional view of a main part of a pressure intensifier according to another embodiment.

The exhaust gas recovery device shown in FIG. 1 has a pressure increasing device 100 connected to the exhaust side of a pneumatic system 10. The pneumatic system 10 has a solenoid valve 12 connected to a pneumatic cylinder 11 and an air supply source P to control the supply and discharge of air to and from the pneumatic cylinder 11, and the pneumatic cylinder 11 has two pneumatic cylinders defined by pistons. By selectively applying air pressure to the pressure chamber, the piston is reciprocated to perform work.

The pressure intensifier 100 has a three-port valve 20 and a pressure intensifier valve 30. The three-port valve 20 increases the pressure of the exhaust air discharged from the pneumatic cylinder 11 that is higher than a predetermined pressure. It is configured to output to the pressure valve 30 and discharge exhaust air having a pressure lower than a predetermined pressure to the atmosphere.

In FIG. 2, a pressure booster valve 30 includes a pair of cylinders 33a, 33 provided on both sides of a main body block 31.
3b, pistons 34a and 34b are inserted so as to be slidable back and forth.
1 are connected to each other by a rod 32 penetrating airtightly, and inside the cylinders 33a, 33b, inside (on the side of the main body block 31) and outside thereof, the pressure increasing chambers 35a, 35b
And drive chambers 36a and 36b are respectively formed in sections,
A pair of inlet check valves 40a, a pair of outlet check valves 40b, and a switching valve 50 are incorporated in the air passage formed in the main body block 31.

The pair of inlet check valves 40a and the pair of outlet check valves 40b are in communication with each other.
The pair of inlet check valves 40a allow only air to flow into the pressure-intensifying chambers 35a and 35b, and the pair of outlet check valves 40a.
b allows only the outflow of air from the pressure intensifying chambers 35a and 35b. However, if an air pressure difference occurs in the pressure intensifying chambers 35a and 35b, the inflow of air to the higher air pressure is prevented.
The outflow of air from the lower air pressure is prevented.

The switching valve 50 switches the flow path so that air is supplied to one of the driving chambers 36a and 36b and air is discharged from the other, and push rods 51a and 51b for switching the flow path are provided. The push rods 51a and 51b are respectively protruded into the pressure-intensifying chambers 35a and 35b, and the reciprocating pistons 34a and 34b press the push rods 51a and 51b near the end of the stroke, thereby causing the switching valve 50 to move. The communication between the ports is switched so that the drive chambers 36a and 36b alternately communicate with an air inlet port and an exhaust port (not shown).

Here, the structure of the pressure increasing device 100 will be described in more detail with reference to FIG. That is,
In the three-port valve 20, a piston 23 is fixed to a valve rod 21. The valve rod 21 is urged in one direction by a first spring 22 attached to the piston 23, and a pair of valves into which the valve rod 21 is inserted. The bodies 24a and 24b are connected to the second spring 25.
Valve seats 26a, 26 communicating with the inlet port 21a
B is urged in a direction to close b, and a pilot pressure chamber 27 is formed outside the piston 23.

The piston 2 is moved by the exhaust air pressure of the pneumatic cylinder 11 introduced into the pilot pressure chamber 27.
3, the valve stem 21 reciprocates, thereby the valve body 24
a and 24b move against the elastic force of the second spring 25, the openings of the valve seats 26a and 26b are switched, and the exhaust air having a pressure lower than a predetermined pressure is discharged into the atmosphere, and the exhaust air having a pressure higher than the predetermined pressure is discharged. It is designed to output air.

At both ends of the main body block 31, cylinders 33 are provided.
a, 33b are provided, and the inlet check valve 40a provided in the cylinders 33a, 33b has a valve seat 41 communicating with the inlet port 21a, and the valve body 4 for opening and closing the valve seat 41 is provided.
3 is urged by a check valve spring 42 in the closing direction of the valve seat 41. Although not shown, the outlet check valve 40b has the same configuration as the inlet check valve 40a.

The switching valve 50 has a pressure-intensifying chamber 35a,
The push rods 51a and 51b protrude into the piston 35b, and the push rods 51a and 51b are pressed near the stroke end of the pistons 34a and 34b to drive the spool 52, and the output ports 53a and 53b are connected to the input port 54. The input port 54 and the output ports 53a, 53b are configured so as to be switched to the discharge ports 55a, 55b for communication.
Are communicated with the flow paths 39a and 39b, and the discharge ports 55a and 55
b communicates with a discharge port (not shown).

Since the exhaust gas recovery apparatus is constructed as described above, first, the exhaust air of the pneumatic cylinder 11 is introduced into the three-port valve 20, and the exhaust air having a pressure lower than a predetermined pressure is discharged into the atmosphere. The higher pressure exhaust air is supplied to the booster valve 30.
Is output to Next, in the pressure increasing valve 30, the exhaust air output from the three-port valve 20 is introduced into the driving chamber 36b, and at the same time, the driving chamber 36a is opened to the atmosphere.
The pistons 34a and 34b start driving rightward by the combined force of the force acting on the piston 34b in the drive chamber 36b and the force acting on the piston 34a in the pressure boosting chamber 35a, whereby the air in the pressure boosting chamber 35b is compressed. Then, the pressure is increased, and is discharged from the outlet port through the outlet check valve 40b.

The pistons 34a and 34b and the rod 32
Reaches the right end, the pressure in the pressure increasing chamber 35b is increased and output from the outlet port is completed, and at the same time, the switching valve 50 is switched so that the driving chamber 36a communicates with the inlet port. Release to the atmosphere through. Therefore, from this state, the pistons 34a and 34b start driving to the left by the combined force of the force acting on the piston 34a in the drive chamber 36a and the force acting on the piston 34b in the pressure-intensifying chamber 35b. Pressure chamber 35a
Is compressed and increased in pressure, and flows out of the outlet port through the outlet check valve 40b.

By repeating such an operation, the pressure intensifying chambers 3 are increased.
5a, 35b continuously increases the pressure of air from the air supply source P.
And collected. In this case, the exhaust air needs to be increased in pressure to a sufficient pressure that can be recovered by the air supply source P. The exhaust air pressure output to the pressure increasing valve 30 by the three-port valve 20 It is determined in consideration of the pressure boosting ability.

Pressure booster 1 of the exhaust gas recovery apparatus shown in FIGS.
At 10, the exhaust side of the pneumatic system 10 and the air supply source P
And a three-port valve 20 is provided between the first and second ports. The three-port valve 20 outputs, to the air supply source P, exhaust air from the pneumatic cylinder 11 that has a pressure higher than a predetermined pressure, and outputs air from the air supply source P. The pressure is increased by the pressure increasing valve 60 and the pneumatic cylinder 1
1 is output. A governor 70 that controls and holds the outputs of the pair of inlet check valves 40a, the pair of outlet check valves 40b, the switching valve 50, and the pressure increasing valve 60 at a constant pressure is incorporated in the flow path formed in the main body block 31. I have.

As shown in FIG. 6, the governor 70 includes a biasing force of a pressure regulating spring 73 acting on an upper surface of a diaphragm 72 defining a feedback chamber 71, and a diaphragm
The output pressure is adjusted to a set pressure according to the magnitude of the acting force of the air pressure of the feedback chamber 71 acting on the lower surface of 2.
The setting pressure of the cabana 70 is adjusted by moving the pressure adjusting screw 75 forward and backward by the rotation of the cap 74 and adjusting the urging force of the pressure adjusting spring 73. In the figure, 31
a is an inlet port into which air from the air supply source P is introduced, 31b is a flow path communicating between the cabana 70 and the three-port valve 20, and the other configuration is the same as in FIGS. The components are denoted by the same reference numerals, and description thereof is omitted.

As described above, according to the exhaust gas collecting apparatus for a pneumatic cylinder of the present embodiment, the exhaust air having a pressure higher than the predetermined pressure is output to the pressure increasing valve 30 by the three-port valve 20, so that the exhaust air is supplied to the air supply source. It becomes possible to easily increase the pressure to a level that can be recovered to P. Therefore, it becomes possible to recover the exhaust air. Further, since the pressure of the air supplied from the air supply source P is increased by the pressure increasing valve 60 and is output to the pneumatic cylinder 11, the air pressure of the air supply source P can be set low, and a large amount of exhaust air is supplied to the air supply source P. Can be recovered. As a result, the air consumption of the pneumatic cylinder 11 is reduced, the power consumption can be reduced, and the cost can be significantly reduced.

Although the exhaust gas recovery apparatus for a pneumatic cylinder according to the embodiment of the present invention has been described in detail above, the present invention is not limited to the exhaust gas recovery apparatus for a pneumatic cylinder according to the embodiment described above. Various changes can be made in the design without departing from the spirit of the invention described in the claims.

[0025]

As will be understood from the above description, the exhaust gas recovery apparatus for a pneumatic cylinder according to the present invention outputs the exhaust air having a pressure higher than a predetermined pressure to the pressure intensifying valve by the three-port valve. Since the pressure that can be recovered by the air supply source can be easily increased, the exhaust air can be recovered, and the air supplied from the air supply source is boosted by the booster valve and output to the pneumatic cylinder. The air pressure of the air supply source can be set low, and a large amount of exhaust air can be collected by the air supply source. Therefore, the air consumption of the pneumatic cylinder is reduced, the power consumption is reduced, and the pneumatic cylinder can be driven at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an exhaust recovery device for a pneumatic cylinder showing an embodiment of the present invention.

FIG. 2 is a schematic diagram of a pressure intensifier in the pneumatic cylinder exhaust recovery device according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a pressure booster in an exhaust recovery device for a pneumatic cylinder according to an embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a pneumatic cylinder exhaust recovery device showing another embodiment of the present invention.

FIG. 5 is a schematic view of a pressure booster in a pneumatic cylinder exhaust recovery apparatus according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a main part of a pressure booster in an exhaust recovery device for a pneumatic cylinder according to another embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a pneumatic system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pneumatic system 11 Pneumatic cylinder 12 Solenoid valve 20 3-port valve 30, 60 Booster valve 100, 110 Booster P Air supply source

Claims (2)

[Claims] 1. A method of selectively applying air pressure to two pressure chambers defined by a piston, and exhausting air having a pressure lower than a predetermined pressure from the exhaust air discharged from a pneumatic cylinder reciprocatingly driving the piston. A three-port valve that discharges air to the inside and outputs exhaust air having a pressure higher than a predetermined pressure; a pressure-intensifying valve that increases the pressure of exhaust air output from the three-port valve and outputs the air to an air supply source that supplies air pressure to the pneumatic cylinder An exhaust gas recovery device for a pneumatic cylinder, comprising: 2. Exhaust air having a pressure lower than a predetermined pressure among the exhaust air discharged from a pneumatic cylinder that reciprocates the piston by selectively applying air pressure to two pressure chambers defined by the piston. A three-port valve for discharging exhaust air having a pressure higher than a predetermined pressure to an air supply source for supplying air pressure to the pneumatic cylinder; and increasing the air pressure supplied from the air supply source to the pneumatic cylinder. An exhaust pressure recovery valve for a pneumatic cylinder, comprising: