JPH1061607A - Two-way pressure controller for air pressure device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly adjust the advancing/retreating speed of a piston for an air pressure device such as an air cylinder or the like. SOLUTION: Valve cylinders 14 are fitted respectively in the base ends of a pair of tightly sealed valve cylinders 11, the base ends being connected to the intake and exhaust port 7 of an air pressure device 1, a check valve 17 is provided in each valve seat cylinder 14, the aid distribution directions of the respective cylinders 14 are opposite to each other and, in the play end sides of the valve seat cylinders 14 in the valve cylinders 11, valve bodies 22 and 32 are housed so as to be moved in an axial direction by an external operating means 29, the valve bodies 22 and 32 being for exhausting air passed through the check valves 17 into the atmosphere via through-holes 16 and 18 formed in the proper spots of the valve cylinders 11 or supplying atmosphere into the air pressure device 1 by adjusting a gap between the valve seat cylinders 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional pressure control device capable of adjusting a moving speed of a piston of a pneumatic device such as an air cylinder when the piston moves forward and backward.

[0002]

2. Description of the Related Art A drive device using an air cylinder as a power source is frequently used in various fields. However, in a normal air cylinder, the speed at which the piston and the piston rod connected to the piston move forward and backward is rapid, so that inconvenience occurs when it is desired to operate the drive device slowly or at a constant speed. A pressure control device for overcoming this disadvantage has already been provided.

A conventional pressure control device is connected to a low pressure chamber (atmosphere opening chamber side) of an air cylinder, so that when the piston rod is retracted, the check valve is opened to allow the outside air to flow freely, and when the piston rod is extended, With the check valve closed,
The flow control valve narrows the amount of air discharged from the low-pressure chamber,
The piston rod is extended at a slow or constant speed.

[0004]

However, in the above-mentioned conventional device, the control is performed only in one direction when the piston rod is extended, and the speed when the piston rod is retracted cannot be controlled. The reciprocating movement time of the work supply device, which is the source, is matched with the cycle time of the machine tool, and when supplying the work to the machine tool in a timely manner, inconvenience occurs and the supply of the work is interrupted. Lower.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is capable of controlling the moving speed of a piston rod when the piston rod moves forward and backward by adjusting the amount of air flowing into and out of an air cylinder or the like. It is an object of the present invention to provide a bidirectional pressure control device for a pneumatic device.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the above objects are attained by providing a valve seat in a pair of hermetically sealed valve cylinders each having a proximal end connected to an intake / exhaust port of a pneumatic device. Fitted, in each valve seat cylinder, a check valve is provided in which the flow direction of air is opposite to each other, and at the free end side of each valve seat cylinder in each of the valve cylinders, a check valve with the valve seat cylinder is provided. By adjusting the gap between the valves, the air that has passed through each check valve can be discharged to the atmosphere or the air can flow into the pneumatic equipment through the ventilation holes formed at the appropriate positions of the valve cylinders. The problem is solved by accommodating the body by the external operation means so as to be movable in the axial direction.

[0007]

1 shows an embodiment of the present invention. (1) is an air cylinder to which the present invention is applied, (2) is its cylinder, (3) is a piston, and (4) Is the piston (3)
(5) is a high-pressure air pipe for supplying compressed air.

The left side of the piston (3) in the cylinder (2) (hereinafter the direction is referred to in the drawing) is a low pressure chamber (L), and the right side is a high pressure chamber (H). In
A return spring (6) is housed. An intake / exhaust port (7) communicating with the low pressure chamber (L) is formed at the left end of the upper surface of the cylinder (2), and the lower end of the connecting pipe (8) is connected to this hole.

The bidirectional pressure control device (A) of the present invention comprises a cylindrical left exhaust pressure regulator (9) and a right intake pressure regulator (10), which are integrally formed with a central partition. Is connected to In addition, each member common to both is described with the same name and reference numeral.

The lower ends of both valve cylinders (11) of the exhaust pressure control valve (9) and the intake pressure control valve (10) are opened, and a plate-shaped closing plate (12) is fixed to the open ends, and the lower surface thereof is The upper end of the connecting pipe (8) is connected to the center of the lower surface of the fixed short communicating pipe (13) in a communicating manner. Cylindrical valve seat cylinders (14) are fitted to lower inner surfaces of both valve cylinders (11), and upper ends thereof are annular valve seats (14a).

At the center of each valve cylinder (11) in the closing plate (12), a column (15) shorter than both valve seat cylinders (14) is erected. The closing plate (12) is provided with a plurality of first ventilation holes (16) that communicate the space surrounding each column (15) with the inside of the communication pipe (13).

On the outer peripheral surfaces of the central portions of the left and right columns (15), annular flexible rubber check valves (17) (17) (17) whose vertical cross-sections are substantially V-shaped and inverted V-shaped, respectively. ) Of the inner cylinder (17a) is fixed, and the outer edge of the slightly thinner outer cylinder (17b) is elastically adhered to the inner surfaces of both valve seat cylinders (14) while maintaining airtightness. doing.

Both valve cylinders (11) and both valve seat cylinders (1
Immediately above 4), a plurality of vertically long second ventilation holes (18) arranged in a ring
Each of the second ventilation holes (18) is provided with a concave groove (20) in the inner surface of the connecting band (19) fitted closely to the outer peripheral surface of both valve cylinders (11).
Is in communication with The concave groove (20) communicates with an intake / exhaust pipe (21) provided continuously at the right end of the connection band (19).

An exhaust valve element (22) is fitted above the valve seat cylinder (14) in the left valve cylinder (11) so as to be movable up and down. It has a downward conical shape that can be fitted into the valve seat cylinder (14). An O-ring (23) is externally fitted to the step of the small diameter portion (22a).

Immediately above the valve body (22) in the valve cylinder (11),
A pressing plate (25) is fitted up and down with a required space between the upper wall (11a) and the upper wall (11a) of the valve cylinder (11). It is fitted.

A pressure adjusting spring (compression coil spring) (2) is provided in a bottomed hole (27) formed in the center of the opposed surface of the valve element (22) and the pressing plate (25).
8) is housed.

A pressing plate is provided at the center of the upper wall (11a) of the valve cylinder (11).
An adjustment bolt (29) for pressing (25) is screwed through a lock nut (30), and a knob (31) is fitted to the upper end thereof.

Above the valve seat cylinder (14) in the right valve cylinder (11), a long intake valve body (32) is fitted so as to be able to move up and down freely. The downward cone in (32a) is
Like the left side, it can fit in the valve seat cylinder (14).

(23) and (26) are the same O
A ring and a seal ring. The lower end of the adjustment bolt (29) screwed into the upper wall (11a) of the valve cylinder (11) is screwed into the screw hole (33) because it is bored at the center of the upper surface of the valve body (32). By rotating the adjusting bolt (29), the valve body (32) is raised and lowered.

The above-described exhaust pressure regulating valve (9) is an air cylinder.
When (1) is not operated, the lower end of the left adjustment bolt (29) comes into contact with the pressing plate (25), and the valve body (22) is pressed by the urging force of the pressure adjusting spring (28). By descending further apart, the small diameter portion (22a) fits into the upper part in the valve seat cylinder (14), and the O-ring (23)
Is in close contact with the valve seat (14a).

The operation of the air cylinder (1) causes the high-pressure chamber
When the compressed air is supplied to (H) and the piston (3) moves in the direction of the solid arrow, the compressed air in the low-pressure chamber (L) becomes
After passing through the communication pipe (13), it goes into the left valve seat cylinder (14), pushes the left check valve (17) open, and flows upward. Then the valve
(22) is pushed up until it is balanced with the urging force of the pressure regulating spring (24), and the air that has flowed in from the gap between the valve body (22) and the valve seat (14a) passes through the second ventilation hole (18) and the recess. Via the groove (20), the intake and exhaust pipes (2
It leaks from 1). At this time, since the right check valve (17) is closed, air does not flow into the right valve seat cylinder (14).

As a result, the amount of air discharged from the low pressure chamber (L) is reduced, and the moving speed of the piston (3) becomes slow.

The moving speed of the piston (3) is adjusted by adjusting bolts (2
By the operation of 9), the pressing plate (25) is raised and lowered, and the pressure adjusting spring (28)
By adjusting the urging force and the vertical position of the valve body (22),
It can be set appropriately.

The piston (3) retreats in the direction of the dotted arrow,
When the pressure in the low pressure chamber (L) is reduced below the atmospheric pressure, outside air flows in from the intake / exhaust pipe (21). At this time, by adjusting the vertical position of the right valve body (32) with the adjustment bolt (29) and appropriately setting the gap with the valve seat cylinder (14) in advance, the outside air is
The right check valve (17) is pushed open to flow into the low pressure chamber (L). Since the left check valve (17) is closed, the left valve seat cylinder
It does not flow into (14). Thereby, the low pressure chamber (L)
The amount of air flowing into the inside is reduced, and the retreat speed of the piston (3) is reduced.

The retreat speed of the piston (3) is adjusted by operating the right adjustment bolt (29) to adjust the vertical position of the valve body (32).
It can be adjusted arbitrarily by adjusting the gap with the valve seat cylinder (14). The left exhaust valve (9) valve body
The structure of (22) may be the same as that of the right valve body (32), and may be directly raised and lowered by the adjustment bolt (29).

[0026]

According to the present invention, the amount of air flowing into and out of the low-pressure chamber of a cylinder in a pneumatic device such as an air cylinder is determined by the action of a check valve and a valve element provided in each valve cylinder. By controlling the advance / retreat speed of the piston, the work supply timing can be adjusted by setting the work supply timing to the machine cycle time, such as making the reciprocating movement time of the work supply device such as a machine tool powered by an air cylinder as a power source constant. Can be matched with

[Brief description of the drawings]

FIG. 1 is a central vertical sectional front view showing a state in which an embodiment of the present invention is applied to an air cylinder.

[Explanation of symbols]

 (A) Bidirectional pressure control device (1) Air cylinder (2) Cylinder (3) Piston (4) Piston rod (5) High pressure air pipe (6) Return spring (7) Intake / exhaust port (8) Connecting pipe (9 ) Exhaust pressure regulator (10) Intake pressure regulator (11) Valve (11a) Top wall (12) Closing plate (13) Communication tube (14) Valve seat (14a) Valve seat (15) Post (16) First Vent hole (17) Check valve (17a) Inner cylinder part (17b) Outer cylinder part (18) Second vent hole (19) Connecting band (20) Recessed groove (21) Suction and exhaust pipe (22) Exhaust valve Body (22a) Small diameter part (23) O-ring (25) Press plate (26) Seal ring (27) Bottom hole (28) Pressure adjusting spring (29) Adjustment bolt (30) Lock nut (31) Knob (32) (32a) Small diameter part (33) Female thread hole (H) High pressure chamber (L) Low pressure chamber

Claims (1)

[Claims] A valve seat is fitted in a base of a pair of hermetically sealed valve cylinders each having a base end connected to an air intake / exhaust port of a pneumatic device. The check valves are arranged such that the flow directions of the check valves are opposite to each other, and the clearance between the check valve and the valve seat cylinder is adjusted on the free end side of each valve seat cylinder in each of the valve cylinders. The air passing through the valve can be moved to the atmosphere through the ventilation holes formed in the appropriate positions of the valve cylinders, or the valve body that allows the air to flow into the pneumatic equipment can be moved in the axial direction by external operation means. A bidirectional pressure control device for a pneumatic device, wherein the pressure control device is housed as a housing.