JPH0330001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a two-way switching valve for a pneumatic tool.

<Prior art> Conventionally, a two-way switching valve for a pneumatic tool uses a combination of a solenoid valve and a timer to shift the primary compressed air supplied from an air compressor, etc. to two flow paths on the secondary side at different times. For example, in a pneumatic tool such as an air nipper, the pneumatic tool body is first moved in a predetermined direction using compressed air, and then the cutter is operated using delayed compressed air. It was hot.

<Problems to be Solved by the Invention> However, the conventional two-way switching valve requires an electric circuit that constitutes a solenoid valve and a timer, and has the disadvantage that the structure is complicated.

In the present invention, after starting the supply of compressed air from an air supply port connected to an air supply source to a first air supply port on the secondary side with only a mechanically simple configuration without using a solenoid valve or a timer, An object of the present invention is to provide a two-way switching valve for a pneumatic tool, which supplies compressed air to a second air supply port after a predetermined time delay.

<Means for solving the problem> A main air supply pipe leading to the first air supply port and a sub air supply pipe leading to the second air supply port are provided in the valve body,
A ball valve device is provided in the middle of the auxiliary pipe, and the ball valve device is operated by an intervening cylinder device so as to respond to the ventilation pressure to the main pipe, and the movement limit of the cylinder device is At this point, the auxiliary conduit is opened to supply air to the second air supply port.

<Function> The present invention guides the compressed air supplied from the first air supply port to the first air supply port via the main air supply pipe, and also directs a portion of the compressed air to the cylinder via the auxiliary air supply pipe. By diverting the air to the device and operating the cylinder device, a ball valve device provided in the middle of the auxiliary pipe is opened at the extreme end, and the compressed air is guided to the second air supply port.

<Example> FIG. 1 is a longitudinal sectional front view of a two-way switching valve of the present invention, FIG. 2 is a bottom view, and FIG. 3 is a side view.

The valve body 1 has a metal rectangular parallelepiped outer shape. An air cylinder chamber 5 is provided in the horizontal direction of a predetermined central range of the horizontally long valve body by passing through the air cylinder chamber 5 step by step from left to right with holes of different diameters having circular cross sections of large, medium, and small diameters. There are large diameter caps 8 on the left and right openings of the chamber.
The small-diameter caps 9 are hermetically fitted with screws,
The air cylinder chamber 5 is closed and the cylinder chamber large diameter section 5 is closed.
a, cylinder chamber medium diameter section 5b, cylinder chamber small diameter section 5
C is installed consecutively.

In the air cylinder chamber 5, a small diameter portion having a tapered tip formed by boring the small diameter inside 12b of the piston 7 normally faces into the cylinder chamber small diameter portion 5c, and during operation, the outer periphery of the small diameter portion is formed into the cylinder chamber small diameter. The outer periphery of the large diameter portion is tightly fitted into the inner periphery of the portion 5c, and the outer periphery of the large diameter portion is tightly fitted into the inner periphery of the medium diameter portion 5b so as to be slidable from side to side by a predetermined distance.
is configured in a cylindrical shape with different diameters. Inside the cylinder large diameter portion 5a is a piston collar portion 7a at the left end of the piston.
A spring 6 wound around the outer periphery of the piston 7 constantly urges the piston 7 to come into pressure contact with the inner end surface of the left large diameter cap 8 between the inner end surface of the cylinder chamber and the right end surface of the large diameter portion 5a of the cylinder chamber. There is.

The inner end of the cap 8 has a small diameter,
The periphery of the inner end surface of the cap contacts the left end of the piston flange 7a, and a large-diameter annular space 18 is formed on the outer periphery of the small-diameter portion as an extension of the large-diameter portion 5a of the cylinder chamber.

The piston 7 has a large-diameter opening further connected to the outer end of the large-diameter interior 12a, and is hung from the stepped portion of the large-diameter opening to tightly fit the plug 19 into the large-diameter interior 12a. The plug has a disc spring 1 between its inner end and the other inner end of the large diameter interior 12a.
0 and the ball 11 are placed inside, and the ball 11 is always kept between the large-diameter interior 12a and the small-diameter interior 12b by the disc spring 10.
The small-diameter interior 1 is connected to the inward step by pressure contact.
2b is sealed.

The small-diameter interior 12b has an inner end small-diameter protruding rod 9' of the small-diameter cap inserted into the cylinder small-diameter portion 5c from the tip opening 12, and its inner end is connected to the ball 1.
It faces the end face of No. 1 with a predetermined small distance therebetween.

On the large diameter wall of the outer periphery of the inner part of the ball of the piston 7,
Through holes 13 of a predetermined diameter are bored at intervals of 90 degrees.

Near one side of the air cylinder chamber 5, a main conduit 15a of a predetermined diameter is opened to the right end in parallel with the chamber, and a sub conduit 15b of a smaller diameter is opened to the left end to communicate with the main conduit 15a. A nipple 3A having a first air supply port 3 is screwed into the part, and a nipple 3A having a first air supply port 3 is screwed into the part, and a nipple 3A having a first air supply port 3 is inserted into the sub-duct from the large-diameter valve chamber end at the outer end of the sub-pipe 15b to the inner end for adjusting the air amount. A throttle valve 17 is screwed into close contact with the throttle valve 17 so as to be movable back and forth, and the auxiliary pipe 15b communicates with a large-diameter annular space 18.

The compressed air supply and feed path for operating pneumatic tools are as follows:
There is a nipple 2A fitted horizontally on the side of the valve body, approximately in the middle.
A conduit that is perpendicular to the air supply port 2 of the piston and communicates with the inside of the piston through a conduit 14 that communicates with the through hole 13 of the piston, and that communicates with the other through hole 13, the main conduit 15a, and the sub conduit 15b. 16 communicates with the air supply port 3 of the nipple 3A and the large diameter annular cavity 18,
A conduit is configured that communicates with the air supply port 4 of the nipple 4A, which communicates with the small diameter portion 5c of the air cylinder chamber via the small diameter inside 12b of the piston. In the figure, 20 is an O-ring that maintains the airtightness of each part when the piston is sliding and ensures the supply of air to the specified air supply port, and 21 is the back pressure outlet of the second air supply port 4, which has a small diameter. Cap 9
The O-ring 20a fitted to the small diameter protruding rod base of the piston is configured to slide toward the end face of the piston opening 12 due to the back pressure and close the opening, thereby ensuring the O-ring 20a escapes from the discharge port. has been done.

2 in the pneumatic tool of the present invention according to the above configuration.
The operation of the directional control valve is as follows.

Compressed air supplied from the primary side of an air compressor (not shown), etc., first flows through the supply port 2 to the pipe line 1.
4, through hole 13 of piston 7, pipe line 16, main pipe line 1
5a, and is supplied to a predetermined circuit of a pneumatic tool (not shown) from the first air supply port 3 on the secondary side.

A portion of the compressed air that has flowed into the main pipe 15a is transferred to the left side, that is, to the small-diameter sub-pipe 15b, to the flow rate regulating throttle valve 1.
7, the diverted compressed air flows into the large-diameter annular space 18 and causes the piston 7 to slide against the spring 6 to the right of the small-diameter portion 5c of the air cylinder chamber.

When the small-diameter tip of the piston 7 slides into the air cylinder small-diameter interior 5c, the ball 11, which has closed the opening 12 and protruded into the piston, collides with the small-diameter protruding rod 9' and resists the disc spring 10. When the small diameter inside 12b and the large diameter inside 12a are communicated with each other by being pushed to the left and removed from the support from the stepped part, the small diameter inside 12b and the large diameter inside 12a are opened into the air cylinder small diameter part 5c, and the compressed air is discharged from the opening 12. The air is supplied to the second air supply port 4 through a through hole 22 formed in the small diameter part so as to communicate with the small diameter part 5c of the air cylinder chamber, and then to a predetermined circuit of the pneumatic tool via the nipple 4A. Therefore, the air supply from the second air supply port 4 is delayed by a predetermined time (minutes, seconds) with respect to the air supply to the first air supply port 3.

Adjustment of how many seconds after the start of compressed air supply to the first air supply port 3 to start supplying compressed air to the second air supply port 4 is performed by moving the throttle valve 17 back and forth into the sub-pipe line 15b. ,
This is done by adjusting and varying the amount of compressed air that enters the large-diameter annular cavity 18.

The rightward sliding limit of the piston is the end face of the small diameter portion of the air cylinder chamber.

<Effects of the Invention> The two-way switching valve for a pneumatic tool of the present invention having the above-described configuration and operation has the following effects.

1) Electrical components such as solenoid valves and timers and electrical circuits are no longer required, resulting in a simple mechanical configuration.

2) By adjusting the throttle valve, it has become possible to arbitrarily set the time to start supplying compressed air to the second air supply port relative to the first air supply port on the secondary side.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a two-way switching valve in a pneumatic tool of the present invention. FIG. 2 is a top bottom view of the same. FIG. 3 is a side view of the same as above. 1... Valve body, 2... Air supply port, 3... First air supply port, 4
...Second air supply port, 5...Air cylinder chamber, 7...Piston, 8...Large diameter cap, 9...Small diameter cap, 11
...ball, 12...opening, 13...through hole, 14...pipe line, 15a...main pipe line, 15b...sub-pipe line, 17...throttle valve, 18...large diameter annular cavity.

Claims (1)

[Claims] 1 Inside the valve body 1, a main air supply pipe 15a to the first air supply port 3 and a sub-air supply pipe 15 to the second air supply port 4.
b are communicated with each other through a conduit 16, the sub conduit is capable of adjusting the flow rate with a throttle valve, an air cylinder chamber 5 is bored in the valve main body, and a piston 7 is tightly fitted therein; 16 and an air supply port 2 connected to an air supply source communicates with the inside of the piston, and the sub-pipe 1
The divided air supplied from 5a presses one end of the piston so that it slides to the other side, and the other opening of the piston is always closed by pressure contact with a ball, and the sliding of the piston causes one end of the piston to slide toward the other side. The ball is pushed against the protruding rod and pushed back to release the opening, and communicates with the second air supply port 4 in the air cylinder chamber through the through hole 22 bored at the tip of the piston. 1st from air supply port 2
A two-way switching valve for a pneumatic tool, characterized in that air is supplied from the second air supply port 4 with a predetermined time delay relative to the supply of air to the air supply port 3.