JP2523877Y2 - Multi-stage switching valve for fluid driven tools - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multistage switching valve for a fluid driven tool for controlling a fluid such as compressed air or hydraulic pressure supplied to a tool driven by fluid pressure.

[0002]

2. Description of the Related Art For example, in a pneumatic tool such as an air nipper for cutting a gate of a molded product, the blade of a cutter with an air nipper opened is positioned at a gate by compressed air supplied initially, and then supplied. There is a pneumatic tool that controls the air so that the blade portion of the cutter is moved to the product side by compressed air, and then the blade portion of the cutter is closed and cut by the further supplied compressed air. However, as a conventional air supply switching valve for a pneumatic tool, there has been a two-way air switching valve as disclosed in, for example, JP-A-59-144802.

[0003]

Since the above-mentioned switching valve is a two-way switching, there is a problem that two switching valves must be combined in an airway tool requiring three operations as described above. . In view of the above, the present invention has been made to solve the above-described problem, and an object of the present invention is to provide a multi-stage switching valve for a fluid driven tool which can be used for a fluid driven tool performing three or more operations with one switching valve. Aim.

[0004]

In order to achieve the above object, a multi-stage switching valve for a fluid-driven tool according to the present invention comprises a valve body 1
Inside, one end side is closed, and the other end side has a second air supply port 5A.
A first cylinder chamber 2A into which the first communication plug 6A is fitted;
A second end having one end closed and a third air supply port 5B on the other end
A second cylinder chamber 2B in which the communication plug 6B is fitted is formed in parallel with the second cylinder chamber 2B, and the second cylinder chamber 2B is located near the cylinder chambers 2A and 2B .
1 a first branch 13A communicating with one end of the cylinder chamber 2A,
A second branch 13B communicating with one end of the second cylinder chamber 2B;
Are formed, and flow control portions 14A, 14B are provided in communication portions between the first and second branch passages 13A, 13B and the first and second cylinder chambers 2A, 2B, respectively.
B and the first piston inserted into the first cylinder chamber 2A.
Externally fits on the insertion side of the first communication plug 6A on the ton 3A
To form the first hole 7A through which the second air supply port 5A communicates.
Then, the second piston 3B inserted into the second cylinder chamber 2B
The second communication plug 6B is fitted to the insertion side of the
A second hole 7B is formed to communicate with the third air supply port 5B.
Second hole portion 7A, bottom and first 7B, the second communication plug 6A, springs 9A back between the insertion end of 6B, a 9B provided, first piston
First communication hole 11A that connects the first hole 7A to the outer periphery
And connect the second hole 7B and the outer peripheral side to the second piston 3B.
A second communication hole 11B is formed through the first cylinder chamber 2A.
The first inner peripheral groove 19A and the second cylinder chamber 2B
The formed second inner peripheral groove 19B and the air supply port 20 formed in the valve body 1 are communicated with each other through the first branch passage 13A through the first communication passage 21, and the first inner space of the first cylinder chamber 2A is formed . The third inner circumferential groove 19a formed on one end side of the circumferential groove 19A and the second branch 13B
By communicating with the second communication passage 22, the valve body 1
From the air supply port 20 via the first branch 13A.
To the first flow path 24 and the flow rate adjusting section of the first branch path 13A.
To the fluid supplied to the back of the first piston 3A via 14A
The first piston 3A is formed when moving to the other side against the more return spring 9A, the air supply port 20 from the first communication passage 21,
The first inner circumferential groove 19A, the first communication hole 11A, the second flow path 25A reaching the second air supply port 5A through the first hole 7A, and in this state,
The back surface of the second piston 3B via the first and third inner peripheral concave grooves 19A, 19a, the second communication passage 22, and the flow control portion 14B of the second branch passage 13B.
Second piston 3B against the spring 9B return the fluid supplied to the is formed when moving to the other side, the air supply port 20
From the first communication passage 21, the second inner peripheral groove 19B, the second communication hole 11B
The third flow path 25B reaching the third air supply port 5B via the second hole 7B
Are formed.

[0005]

According to the present invention, when the compressed fluid is not supplied, the first and second pistons 3A, 3B are returned by the return springs 9A, 9B .
Are held at the return position, and the first and second inner peripheral concave grooves 19A and 19B and the first and second communication holes 11A and 11A, which constitute the second and third flow paths 25A and 25B, respectively .
11B is in a non-communicating state, and the second and third flow paths 25A and 25B are in a closed state.

When the compressed fluid is supplied from the air supply port 20, the second
The compressed fluid is supplied from the first air supply port 15 to the predetermined flow path of the fluid-driven tool through the one flow path 24. At this time, a part of the compressed fluid is branched from the first branch 13A, and is opposed to the return spring 9A.
Moving the first piston 3A to the other end of the first cylinder chamber 2A. By this movement, the first inner peripheral concave groove 19A and the first communication hole 11
A is in communication with the second fluid passage 25A, and the second flow passage 25A is opened.Here, a predetermined time is delayed from the supply of the compressed fluid from the first air supply port 15, and another fluid drive tool is connected to the second air supply port 5A. A compressed fluid is supplied to the flow path.

Further, a part of the compressed fluid supplied to the first inner peripheral groove 19A is branched from the third inner peripheral groove 19a and the second branch path 13B, and the second cylinder chamber is opposed to the return spring 9B. The second piston 3B is moved to the other end of 2B. This movement first
(2) The inner peripheral groove 19B and the second communication hole 11B communicate with each other,
The third flow path 25B is opened, and here, the compressed fluid is supplied from the third air supply port 5B to another flow path of the fluid-driven tool after a predetermined time delay from the supply of the compressed fluid from the second air supply port 5A. Supplied.

[0008] The first and second pistons 3A and 3B correspond to the second and third pistons .
It also has a valve function for opening and closing the three flow paths 25A and 25B.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 9, reference numeral 1 denotes a valve body which is formed in a rectangular parallelepiped. First and second two cylinder chambers 2A and 2B are formed in the valve body 1 in the longitudinal direction, and first and second pistons 3A and 3B are formed in the first and second cylinder chambers 2A and 2B. It is movably mounted. 4A and 4B are the first and second cylinder chambers
2A, 2B A lid screwed to close one end side .
1, on the other end side of the second cylinder chambers 2A, 2B, first and second communication plugs 6A, 6B having second and third air supply ports 5A, 5B are provided .
It is screwed into the second cylinder chambers 2A and 2B as a protruding shape. First, second piston 3A, to the other end of the 3B first,
First and second holes 7A and 7B are formed to be fitted into and disengaged from the two communication plugs 6A and 6B, and the bottoms 7a and 7b of the first and second holes 7A and 7B and the
1, Steps 8A, 8B formed on the protruding parts of the second communication plugs 6A, 6B
Coiled return springs 9A between, 9B are attached, first,
The second pistons 3A, 3B are urged to return to one end, that is, to the lids 4A, 4B. Also, the first and second communication plugs 6A and 6B
First, second hole 7A, 7B and second, 3 air supply port 5A, first, second communication passage 10A for communicating the 5B, 10B are formed in the axial direction on.

[0010] The radial sides of the first and second holes 7A and 7B are
The first and second communication holes 11A and 11B are formed in an inner and outer communication shape, and the first and second communication holes 11A and 11B correspond to the first and second communication holes 11A and 11B .
First and second outer circumferential concave grooves 12A and 12B are formed in the outer circumferential surface of the two pistons 3A and 3B. As shown in FIGS. 4 and 7, the valve body 1 is formed with first and second branch passages 13A and 13B parallel to the axis of the first and second cylinder chambers 2A and 2B .
On one end side of the second branch passages 13A, 13B, that is, on the lids 4A, 4B side, there are provided flow rate adjusters 14A, 14B capable of adjusting the air flow rate .
The other end of the one branch 13A is a first air supply port 15. The first and second cylinder chambers 2A and 2B sides of the lids 4A and 4B are formed with small diameters, and the first and second cylinder chambers 2A and 2B communicate with the first and second cylinder chambers 2A and 2B .
Two communication chambers 16A and 16B are provided, and are in communication with the flow control units 14A and 14B. The flow control sections 14A, 14B are each provided with a throttle valve 18A, 18B having tapered sections 17A, 17B whose diameter gradually decreases in the distal direction .
1, is screwed into the second branch 13A, 13B so as to be able to advance and retreat
It is configured such that the flow rate supplied to the first and second communication chambers 16A and 16B is increased by being screwed down.

The inner circumferential surfaces of the first and second cylinder chambers 2A and 2B have circumferentially annular first, second, third and fourth inner circumferential grooves 19, respectively.
A, 19B, 19a, 19b are formed, as shown in FIGS.
The first and second inner circumferential grooves 19A and 19B and the air supply port 20 formed in the valve body 1 are communicated with each other through a first branch passage 13A in a first communication passage 21, and the first inner circumferential groove 19A is formed. The second branch path 13B communicates with the second branch path 13B through the second communication path 22.

Then, as shown in FIG. 4, the first air supply port from the air supply port 20 through the first communication passage 21 and the first branch passage 13A.
The first flow path 24 is formed leading to 15, as shown in FIG. 5, the
1 piston 3A is in the state of being moved to the other end of the first cylinder chamber 2A, the supply port 20, the first communication passage 21, the first inner peripheral groove 19A, the first outer peripheral groove 12A, the first communication hole 11A, the first hole portion 7A, the second leading to the second air supply port 5A through the first communication passage 10A
Passage 25A is configured, as shown in FIG. 8, the second piston
After 3B moves to the other end side of the second cylinder chamber 2B, the first communication passage 21, the second inner circumferential groove 19B, the second outer circumferential groove 12
B, the second communication hole 11B, second hole portion 7B, a third flow path 25B leading to the third air supply port 5B through the second communication passage 10B is formed.

The air supply port 20, the first, second and third air supply ports 15, 5A and 5B are formed with female threads for pipe connection. Further , open holes 26A, 26B communicating with the outside of the valve body 1 are formed on the other end sides of the first and second cylinder chambers 2A, 2B, that is, on the first and second communication plugs 6A, 6B side. Further, an O-ring 27 is mounted at an appropriate position to maintain airtightness. The embodiment of the present invention is configured as described above, and compressed air supplied from a compressed air supply source such as an air compressor is first supplied from the air supply port 20 to the first air supply port through the first flow path 24.
From 15 is supplied to a predetermined channel of the pneumatic tool.

[0014] In this first flow path air supplied to the 24 first branch passage 13A, a portion flows into the first communication chamber 16A through the flow rate adjusting unit 14A, against the spring 9A return the first piston 3A To the other end, and to the position shown in FIGS. By this movement, the first inner peripheral groove 19A and the first outer peripheral groove
The second flow path 25A is opened, and the air supplied to the air supply port 20 is supplied from the second air supply port 5A to another flow path of the pneumatic tool. This is delayed by a predetermined time as compared with the supply to the first air supply port 15 side.

Further, the air supplied to the second flow path 25A is
First communication hole 11A, first outer peripheral groove 12A, third inner peripheral groove 19a
, The second branch passage 13B via the second communication passage 22, a portion flows into the flow rate adjuster second communication chamber 16B through 14B, the
2 The piston 3B is moved to the other end side against the return spring 9B,
Move to the position shown in FIGS. By this movement
The second inner circumferential groove 19B and the second outer circumferential groove 12B are communicated with each other, and the third flow path 25B is opened here, and the air supplied to the air supply port 20 is supplied from the third air supply port 5B to the airway tool. Is supplied to the other flow path, and this supply is delayed by a predetermined time as compared with the supply to the second air supply port 5A side.

The above delay time can be adjusted by adjusting the movement of the throttle valves 18A and 18B. In the above-described embodiment, an example in which two cylinder chambers 2A and 2B are formed in the valve main body 1 has been described. However, the two cylinder chambers may be provided as three cylinder chambers and four air supply ports may be provided. These may be formed in multiple stages. Further, in the above embodiment, when the first piston 3A is moved to the other end side against the return spring 9A, the air supplied to the second communication passage 22 is supplied to the first piston 3A.
Of has been described so as to flow through the first communication hole 11A, which is not always required to flow through the first communication hole 11A, first inner peripheral groove 19A shown in FIG. 5, the outer periphery of the first outer peripheral groove 12A Side, first
(3 ) The power may be supplied to the second communication passage 22 through the inner peripheral groove 19a.

Further, as shown in the embodiment, a return spring is provided between the bottoms 7a, 7b of the first and second holes 7A, 7B and the steps 8A, 8B of the first and second communication plugs 6A, 6B. 9A, since HazamaSo the 9B, the first
1. The inside of the second cylinder chambers 2A and 2B can be made compact.

[0018]

[Effects of the Invention] According to the present invention, the first and second
2 to form the first, second, third
Since it is configured to have a One of feed air inlets, it is possible to perform the function of at least 3 operating fluid driving tool with a single switching valve, thus it is not necessary to combine the two switching valve as in the prior art The structure can be simplified, and the same shape can be used for the piston, the lid, the plug having the air supply port, the return spring, etc., which are provided in the plurality of cylinder chambers, so that the cost can be reduced. it can.

In particular, in the present invention, in the valve body 1,
A first end having a closed end and a second air supply port 5A on the other end
The first cylinder chamber 2A into which the communication plug 6A is inserted, and one end side
Is closed, and a second communication plug having a third air supply port 5B on the other end side is provided.
The second cylinder chamber 2B in which the lug 6B is fitted is formed in parallel with the first cylinder chamber 2B , and the first cylinder chamber 2A, 2B is located near the first cylinder chamber 2B.
A first branch 13A communicating with one end of the cylinder chamber 2A;
A second branch 13B communicating with one end of the cylinder chamber 2B is formed.
And the first and second branch passages 13A and 13B and the first and second cylinder chambers.
Flow control sections 14A and 14B are provided in the communication portions with 2A and 2B, respectively , and the first piston 3A inserted into the first cylinder chamber 2A is provided.
Then, when it is fitted to the fitting side of the first communication plug 6A
Both form a first hole 7A through which the second air supply port 5A communicates,
2 Connect the second piston to the second piston 3B inserted into the cylinder chamber 2B.
The outer plug is removably fitted to the insertion side of the
A return hole is formed between the bottoms of the first and second holes 7A and 7B and the fitting ends of the first and second communication plugs 6A and 6B. 9A and 9B are provided, and the first piston 3A
Formed a first communication hole 11A that communicates the first hole 7A with the outer peripheral side
And communicates the second piston 3B with the second hole 7B and the outer peripheral side.
A second communication hole 11B is formed and formed in the first cylinder chamber 2A.
Formed in the first inner peripheral concave groove 19A and the second cylinder chamber 2B.
And a second inner peripheral groove 19B, the air supply port 20 formed in the valve body 1 communicates with the first communication passage 21 through the first branch passage 13A, the first inner circumference of the first cylinder chamber 2A Since the third inner peripheral concave groove 19a formed on one end side of the concave groove 19A and the second branch passage 13B are communicated with each other through the second communication passage 22, one valve element 1
The valve mechanism for causing the fluid-driven tool to perform at least three operations can be simply incorporated and compactly built therein, so that the valve body 1 can be formed compact.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view when the piston of FIG. 4 is moved.

FIG. 6 is a vertical sectional front view of FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII in FIG. 3;

FIG. 8 is a cross-sectional view when the piston of FIG. 7 is moved.

FIG. 9 is a vertical sectional front view of FIG. 8;

[Explanation of symbols]

1 Valve body 2A First cylinder chamber 2B Second cylinder chamber 3A First piston 3B Second piston 5A Second air inlet 5B Third air inlet 7A First hole 7B Second hole 9A, 9B Return spring 11A 1 communication hole 11B second communication hole 13A first branch 13B second branch 14A, 14B flow rate adjusting part 15 first air supply port 19A first inner concave groove 19B second inner concave groove 19a third inner concave Groove 20 Air supply port 21 First communication path 22 Second communication path 24 First flow path 25A Second flow path 25B Third flow path

Claims (1)

(57) [Scope of request for utility model registration] 1. One end of a valve body is closed in a valve body.
A first communication plug (6A) having a second air supply port (5A) at the end is fitted.
The first cylinder chamber (2A) is closed and one end is closed.
A second communication plug (6B) having a third air supply port (5B) at the end is fitted.
Forming input has been second cylinder chamber and (2B) in parallel form, and these cylinder chamber (2A), close to (2B), the first cylinder
A first branch (13A) communicating with one end of the chamber (2A);
A second branch (13B) communicating with one end of the cylinder chamber (2B);
And the first and second branch paths (13A) and (13B) are combined with the first and second branches .
Flow control sections (14A) and (14B) are provided in the communication sections with the cylinder chambers (2A) and (2B), respectively , and inserted into the first cylinder chamber (2A).
Insert the first communication plug (6A) into the inserted first piston (3A).
Side and the second air supply port (5A)
The first hole (7A) is formed and inserted into the second cylinder chamber (2B).
Insert the second communication plug (6B) into the inserted second piston (3B).
Side and the third air supply port (5B)
A second hole (7B) is formed, and the first and second holes (7A) and (7B) are formed.
Return springs (9A) and (9B) are provided between the bottom of the first piston and the end of the first and second communication plugs (6A) and (6B ).
The first communication hole (11A) that connects the first hole (7A) to the outer peripheral side
Formed in the second piston (3B) and the outer peripheral side with the second hole (7B).
A second communication hole (11B) is formed to communicate with the first cylinder.
The first inner peripheral groove (19A) and the second
The second inner circumferential groove (19B) formed in the cylinder chamber (2B) and the valve body
The first cylinder chamber (2A) is communicated with the air supply port (20) formed in (1) through a first branch passage (13A) through a first communication passage (21).
The third inner peripheral groove (19a) formed at one end side of the first inner peripheral groove (19A) and the second branch path (13B) are communicated with the second communication path (22), whereby Air inlet (20) in valve body (1)
To the first air inlet (15) via the first branch (13A).
1 The flow path (24) and the flow rate adjusting section (14) of the first branch path (13A)
Fluid supplied to the back of the first piston (3A) via ( A)
By returning the first piston against the spring (9A) (3A) is formed when moving to the other side, the first communication from said supply port (20)
Passage (21), the first inner peripheral groove (19A), the first communication hole (11A), the
Second passage leading to the second air supply port through 1 hole a (7A) (5A) (25
A), and in this state, the first and third inner peripheral grooves (19A), (19a)
, The second communication passage (22), and the flow adjusting portion (14) of the second branch passage (13B).
Fluid supplied to the back of the second piston (3B) via (B)
By returning the second piston against the spring (9B) (3B) is formed when moving to the other side, the first communication from said supply port (20)
Passage (21), the second inner peripheral groove (19B), a second hole (11B), the
( 2 ) The third flow path (25) to the third air supply port (5B) through the hole (7B)
B) A multi-stage switching valve for a fluid-driven tool, characterized in that: