JPH08247366A - Joint for automatic piping loading and unloading device - Google Patents

Abstract

PURPOSE: To make a fluid less apt to be spilt outside a joint when the joint is separated. CONSTITUTION: A female joint and a male joint are arranged on the same axis, facing each other, and are relatively moved along the axis to be connected to or disconnected from each other. The female joint 31 is made up of a female side main body 41, a female side valve body 42, a female side valve seat body 43, and a spring 44. The male joint 32 is made up of a male side main body 45, a male side valve body 46, and a spring 47. In this joint, when the female joint and the male joint are coupled, the male side body moves the female side valve body against the spring to open a joint-opening, while the female side valve seat body moves the male side valve body against the spring to open a joint opening, and thus pipings are connected to each other. A pressure chamber 60 for energizing the female side valve body in the direction in which it is closed, is formed, and the pressure chamber and the female side internal passage 59 are connected through a throttle 61. Further, a check valve 63 where the direction from the female side internal passage toward the pressure chamber is regarded as forward direction, is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint used for an automatic pipe attachment / detachment device for hydraulic, hydraulic, pneumatic, etc. for general industrial machines.

[0002]

2. Description of the Related Art A pipe joint of this type is shown in FIG. This joint is the first fixed to the fixed face plate 1.
It is composed of the main body 2 side and the second main body 4 side fixed to the moving face plate 3. The first main body 2 is of a tubular shape having a connection hole 5 at the front end surface and has a pipe connection port 6 at the rear end. The second main body 4 has a tip end portion having an outer diameter that fits into the connection port 5 of the first main body 2, a second valve hole 8 on the front end surface 7, and a pipe connection port 9 on the rear end. The first main body 2 and the second main body 4 are on the same axis fixed to the face plates 1 and 3, respectively, and the movement of the moving face plate 3 causes the second main body 4 to move along the axis. There is. A valve seat 10 is provided in the first main body 2 so as to be slidable along the axis, and the valve seat 10 has a first valve hole 11 in a front end wall thereof and is pressed toward the connection port 5 side by a first spring 12. And is in contact with the stepped portion 13 of the first main body 2. First
A first check valve 14 is provided to close the valve hole 11 from the outside. A valve hole 15 is separately provided in the first main body 2.
A check valve 17 is provided which is pressed forward by a spring 16 to close the check valve 17, and the check valve 17 and the first check valve 1 are provided.
4 and 4 are connected by a rod-shaped portion 18. In the second body 4, the first valve hole 8 is closed from the inside by pushing the second valve hole 8 with the second spring 19.
A second check valve 20 having a larger diameter than the check valve 14 is provided.
Separately, an annular seal member 21 is provided at a position where the tip end surface of the valve seat 10 faces the tip end surface of the second main body 4. The seal member 21 surrounds the outer sides of the first and second valve holes 11 and 8 when the tip surface 7 of the second body 4 contacts the tip of the valve seat 10, and in the connected state. The fluid pressure acting on the valve seat 10 presses the valve seat 10 toward the second main body 4 side due to the diameter difference between the valve seat 10 and the seal member 21, and maintains the sealed state.

In this pipe joint, the moving face plate 3 is moved toward the fixed face plate 1 by a predetermined distance, so that the moving face plate 3 shown in FIG.
The separated state can be changed to the connected state shown in FIG. That is, when the second main body 4 is fitted into the connection port 5 of the first main body 2, the front end surface 7 of the second main body 4 comes into contact with the front end surface of the valve seat 10 and further moves, whereby the second check valve. The leading end surface of 20 and the leading end surface of the first check valve 14 contact each other, and the valve seat 1
0 is moved backward in the first main body 2 against the first spring 12, and the first check valve 14 opens the first valve hole 11 and the check valve 17 and the second check valve 2 via the rod portion 18. The stop valves 20 press each other to open the valve hole 15 and the second valve hole 8, and the pipe connection port 6,
9 is connected.

From the connection state shown in FIG.
When the valve is retracted, the operation is the reverse of that described above, and the second check valve 2
0 and the check valve 17 are closed, and then the first check valve 14 is closed,
The valve seat 10 is moved forward in the first body 2,
The front end surface 7 of the main body 4 is separated from the front end surface of the valve seat 10 to be in the separated state shown in FIG.

[0005]

In the conventional joint described above, the fluid supply into the first main body 2 and the second main body 4 is shut off and the state shown in FIG. 5 (a) is changed to the state shown in FIG. 5 (b). There is no particular difference when the fluid is flowed after the connection state of (). However, if the high pressure fluid is connected only in the second main body 4 and is connected, the valve seat 1
There is a problem that 0 and the second body 4 are separated by the fluid pressure to cause fluid leakage. That is, in the process of shifting from the state of FIG. 5A to the state of FIG. 5B, when the second check valve 20 is slightly separated from the second valve hole 8, the pressure fluid in the second main body 4 flows out. And flows into the inner portion of the annular seal member 21 in the gap between the front end surface 7 of the second body 4 and the front end surface of the valve seat 10, and at this point the first valve hole 11 is not fully opened. That is, the valve seat 10 is moved backward by the fluid pressure to temporarily cause fluid leakage. When the high-pressure fluid acts on the inside of the first main body 2, the fluid leakage does not occur because the valve seat 10 is pressed in the forward direction by the fluid pressure.

[0006]

According to the means of the present invention, a female joint and a male joint each having an internal passage are arranged opposite to each other on the same axis line and are relatively moved along the axis line so as to be connected and separated from each other. And the female joint is a tubular body having a connection opening at the tip end, a female body having a valve hole fitted into the connection opening of the female body, and the female side thereof. A female valve seat body that is fitted into the valve hole of the valve body and is fixed to the inner circumference of the female body to restrict movement of the female valve body in the direction of the front end surface;
A cylindrical male side main body having a connection opening at a position facing the connection opening of the female side main body, and a male side thereof, the male side being constituted by a spring for urging the female side valve body in a closing direction. A male valve body that closes the connection opening of the main body from the inner circumference of the male body, and a spring that urges the male valve body in the closing direction,
When the female joint and the male joint are coupled, the male body moves the female valve body against the spring to open the connection port, and the female valve seat body is used for the male valve. In a pipe automatic connection / disconnection joint for connecting pipes by moving a body against a spring to open a connection port, a pressure chamber for urging the female valve body in a closing direction is formed. The check valve is characterized in that the check valve is connected to the female side internal passage via a throttle and separately has a forward direction from the female side internal passage to the pressure chamber.

[0007]

When the male joint is driven and advances at the time of connection, the male joint and the female joint approach each other, and the tip end face of the female valve body and the tip end face of the male main body first come into contact with each other, and almost simultaneously with this. The tip surface of the side valve seat and the tip surface of the male valve body come into contact with each other, and they come into contact with each other at the contact surfaces.When the male joint further advances, the female valve body is pushed by the male body. And the female side valve hole opens, and the male side valve body abuts on the female side valve seat body and stops, so the connecting hole of the male side body opens and both internal passages are in communication. The male joint reaches the predetermined advance position and stops, and the coupling is completed. When pressure fluid is present in the female joint internal passage at the time of this connection, the pressure also acts on the pressure chamber, and the female valve body is retracted against the pressure and the female spring force. During the retreat, the fluid in the pressure chamber is pushed out through the throttle into the internal passage. As a result, a state in which the front end surface of the female valve body and the front end surface of the male side body are strongly pressed against each other is obtained, so that there is no fluid leakage.

In addition, when high pressure fluid is present in the internal passage of the male joint and low pressure (for example, about atmospheric pressure) fluid is present in the female joint at the time of connection, the male body pushes the female valve body and retracts. The resistance to be caused is the spring force on the female side and the outflow resistance that the fluid flows out of the pressure chamber through the throttle.When the internal passages of both are connected, the high pressure fluid in the male internal passage momentarily causes the female valve to Even if the body receives a large acting force in the backward direction, the female valve body does not separate from the male body due to the outflow resistance from the throttle. Therefore, at the time of joint connection, there is no fluid leakage regardless of the presence of high-pressure fluid in any of the internal passages.

When the male joint is driven and retracts at the time of separation from the connected state, the male body is retracted first, and the male valve body is pushed by the male spring, so that it contacts the female valve seat body. Keep in touch. At this time, a force toward the male body acts on the female valve body due to the pressing force of the female spring and the fluid pressure of the pressure chamber, and the female valve body is kept in contact with the male body and Follow retreat. Although the volume of the pressure chamber increases due to the forward movement of the female valve element, the pressure chamber and the internal passage communicate with each other through the throttle and the check valve, and the same pressure as the internal passage always acts on the pressure chamber. Therefore, the female valve body reliably follows the retreat of the male body. When the male joint is further retracted and the connection port of the male side body is closed by the male side valve body, almost simultaneously with this, the female side valve hole is closed by the female side valve seat body. When the male joint is further retracted, both contact surfaces are separated from each other, the male joint reaches a predetermined retracted end and stops, and the separation is completed. Therefore, the internal fluid does not leak even when separated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. This joint is a female joint 31 fixed to the fixed face plate 1.
And a male joint 32 fixed to the moving face plate 3, and the female joint 31 includes a female body 41, a female valve body 42, and a female valve seat body 4.
3 and the female side spring 44, the male joint 32 is
It is composed of a male body 45, a male valve body 46, and a male spring 47.

The female side body 41 has a connection port 51 on the front end surface 50.
It has a cylindrical shape and has a pipe connection port 6 at the rear end. The male main body 45 has a tip portion with an outer diameter that fits into the connection opening 51 of the female main body 41, and a connection opening 53 is provided on the tip end surface 52 thereof.
And a pipe connection port 9 is provided at the rear end. Female body 4
1 and the male side body 45 are on the same axis fixed to the face plates 1 and 3, respectively, and the movement of the moving face plate 3 causes the male side body 45 to move along the axis. A female valve body 42 is provided in the female body 41 so as to be slidable along the axis, and the female valve body 42 has a valve hole 54 in a tip wall.
And is pressed toward the connection port 51 side by the female side spring 44 and is in contact with the female side valve seat body 43. The female spring 44 is
The female valve is arranged inside the female valve body 42 in a compressed state, the front end abuts on the female valve body 42, and the rear end abuts on the front end of a member 56 fixed in the female body 41. The body 42 is biased so as to move in the distal direction. The female valve seat body 43 is
The front end is formed in the shape of a poppet valve with a flat surface, and the rear end of a rod-shaped portion 55 that continues to the rear portion and passes through the inner hole of the female valve body 42 with a margin is fixed to the female body 41 via a member 56. ing. The valve hole 54 is closed by the female valve body 42 being pressed forward and brought into contact with the valve seat body 43.
In the figure, reference numeral 57 denotes a communication hole, which penetrates the member 56 in the front-rear direction, and has a front internal passage 58 formed inside the female valve body 42 in the female main body 41 and a rear internal passage in the female main body 41. It communicates with the internal passage 59 on the side.

The state where the female valve body 42 is advanced (see FIG. 3)
A ring-shaped pressure chamber 60 is formed between the female-side main body 41 and the member 56 so as to be closed at the rear end thereof by a passage 62 through which the inside of the pressure chamber 60 and the internal passage 59 communicate with each other through the throttle 61. , And a passage 64 having a check valve 63 whose forward direction is the direction from the inner passage 59 to the pressure chamber 60 (shown by a hydraulic symbol in FIG. 3, and the actual position is shown in a sectional view in FIG. 4). is there. The pressure chamber 60 is closed by its rear end in a state where the female valve body 42 is advanced, and when the internal pressure of the pressure chamber 60 is higher than the internal passage 59 side, the pressure chamber 60 is communicated with the internal passage 59 side only through the throttle 61. When the internal pressure of the pressure chamber 60 is lower than that on the internal passage 59 side, the pressure chamber 60 is communicated with the throttle 61 and the check valve 63. Further, the pressure chamber 60 is
When the female valve body 42 is slightly retracted from the forward position, the contact between the inner peripheral surface of the female valve body 42 and the outer peripheral surface of the member 56 is separated, and a gap 65 (see FIG. 1) is generated to create a gap inside the pressure chamber 60 and inside the pressure chamber 60. Passage 58
And are formed so as to communicate with each other.

The male body 45 has an internal passage 70, a connection port 53 that is open to the tip surface 52, a male valve body 46 that closes the connection port 53 from the inside by a male spring 47, and an internal passage 70. Is provided with a pipe connection port 9. Connection port 53
The inner diameter of is larger than the outer diameter of the female valve seat body 43. The male-side valve element 46 has a flat end surface and is provided so as to slide along the inner peripheral surface of the male-side main body 45. The male side spring 47 is installed in a compressed state between the spring receiver 72 provided in the male side body 45 and the male side valve body 46.
Is urged so as to proceed toward the connection port 53 side. In the figure, 73 is a communication hole, which connects the front part and the rear part of the male valve body 45.

Separately, the male body 4 on the tip surface of the female valve body 42
An annular seal member 74 is provided at a position facing the front end surface 52 of No. 5. The seal member 74 is provided with a valve hole 5 when the front end surface 52 of the male body 45 contacts the front end of the valve female valve body 42.
4, the outside of the connection port 53 is surrounded, and the fluid pressure acting on the female valve body 42 in the connected state is
Due to the diameter difference between the female valve body 42 and the seal member 74, an action force for pressing the female valve body 42 toward the male body 45 side is generated.

In this pipe joint, by moving the movable face plate 3 toward the fixed face plate 1 by a predetermined distance, the pipe joints shown in FIGS.
The separated state can be changed to the combined state shown in FIG. That is, when the male main body 45 is moved forward so as to fit into the connection port 51 of the female main body 41, the front end surface 52 of the male main body 45 contacts the front end surface of the female valve body 42, and at the same time, the male main body 45 contacts the male main body 45. The leading end surface of the side valve body 46 and the leading end surface of the female side valve seat body 43 come into contact with each other, and by further movement, the female side valve body 42 causes the reaction force of the female side spring 44 and the fluid in the pressure chamber 60 to contract. Against the outflow resistance flowing out through the female side main body 41, the female side valve body 42 opens the valve hole 54, and at the same time, the male side valve body 46 is closed by the female side valve seat. Since it is stopped in contact with the body 43, the connection port 53 opens as the male main body 45 advances, and the pipe connection ports 6 and 9 are connected.
In the initial stage of this connection, when high-pressure fluid exists in the male joint 32, high pressure acts on the front surface of the female valve body 42 at the moment when the male-side connection port 53 opens, and the female-side valve body 42 receives high pressure. Although the acting force for retreating the side valve body 42 increases, since the pressure chamber 60 exists, the female side valve body 42 does not suddenly retreat,
Since the contact state between the front end surface 52 of the male-side main body 45 and the front end surface of the female-side valve body 42 is maintained, fluid leakage does not occur at the initial stage of connection. After the initial stage, a gap 65 is formed, the pressure chamber 60 communicates with the internal passage 58, the internal pressure of the pressure chamber 60 decreases, and the resistance effect of the throttle 61 decreases.
The resistance due to the female spring 44 is the main. Then, the moving face plate 3 reaches a predetermined moving end and stops, and the state is maintained,
The joint connection state shown in FIG. 1 is maintained.

In the initial stage of the connection state, when high-pressure fluid is present in the female joint 31, high pressure does not suddenly act on the front surface of the female-side valve body 42, so that fluid leakage occurs. Does not happen. Therefore, no leakage of fluid occurs in this pipe joint at the initial stage of being in the connected state regardless of which side the high-pressure fluid is present.

When the moving face plate 3 is retracted from the connected state shown in FIG. 1, the operation reverse to that described above is performed, the valve hole 54 and the connection port 53 are closed, and the front end surface 52 of the male body 45 is the female valve body 42.
Of the male valve body 46, and at the same time, the distal face of the male-side valve body 46 separates from the distal face of the female-side valve seat body 43, resulting in the separated state shown in FIGS. 2 and 3. A gap 65 communicating between the pressure chamber 60 and the internal passage 58 shortly before the valve hole 54 and the connection port 53 are closed.
However, since the fluid can flow into the pressure chamber 60 through the check valve 63 during the entire forward movement of the female valve body 42 where the internal pressure decreases, there is no problem due to the provision of the pressure chamber. . In addition, when the female joint 31 and the male joint 32 are joined, the backward movement of the female valve body 42 due to the fluid pressure acting on the connecting surface 50 of the female joint 31 causes the pressure chamber 6 provided inside the female joint 31 to move backward.
Since it is prevented by 0, it is not necessary to process the connection surface 50 of the female joint 31 and the tip surface 52 of the male joint 32. Therefore,
The connecting surface 50 and the tip surface 52 can be flat,
The amount of fluid remaining between the connecting surface 50 and the tip surface 52 can be minimized. Therefore, when the male joint 32 and the female joint 31 are separated from each other, the contact surface that is in contact with the inside of the seal member 74 may be in a wet state when the internal fluid is a liquid. Does not reach.

[0018]

As described above, according to the present invention, it is possible to eliminate the fluid leakage that has occurred temporarily when connecting one side of the conventional joint for automatic attachment / detachment of piping while the internal pressure acts on one side, and disconnect the same. In this case, there is almost no leakage, and when the fluid is a liquid, the drop does not drip, and the effect of preventing contamination of the surroundings is achieved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a joined state according to an embodiment of the present invention.

FIG. 2 is a partial vertical sectional view of the male joint in the separated state according to the embodiment.

FIG. 3 is a partial vertical cross-sectional view (cross-sectional view taken along the line BB in FIG. 4) of the female joint in the separated state according to the embodiment.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

5A and 5B show an example of a conventional joint, FIG. 5A is a partial vertical sectional view in a separated state, and FIG. 5B is a partial vertical sectional view in a coupled state.

[Explanation of symbols]

 1 Fixed Face Plate 3 Moving Face Plate 31 Female Joint 32 Male Joint 41 Female Side Main Body 42 Female Side Valve Body 43 Female Side Valve Seat Body 44 Female Side Spring 45 Male Side Body 46 Male Side Valve Body 47 Male Side Spring 50 Tip Surface 51 Connection Port 52 front end surface 53 connection port 54 valve hole 56 member 57 communication hole 58 internal passage 59 internal passage 60 pressure chamber 61 throttle 63 check valve 70 internal passage

Claims (1)

[Claims] 1. A female joint and a male joint each having an internal passage are arranged so as to face each other on the same axis line and are relatively moved along the axis line so as to be coupled and separated from each other. , A female body of a cylindrical body having a connection port on the tip surface, a female valve body fitted in the connection port of the female body and having a valve hole, and a female body fitted in the valve hole of the female side body The male joint is fixed to the inner circumference of the main body and is constituted by a female valve seat body that regulates the movement of the female valve body in the direction of the front end surface, and a spring that urges the female valve body in the closing direction. A cylindrical male body having a connection port at a position facing the connection port of the female body, a male valve body closing the connection port of the male body from the inner circumference of the male body, and the male thereof. A spring for urging the side valve element in the closing direction, and when the female joint and the male joint are coupled, the male side book A body moves the female valve body against a spring to open a connection port, and the female valve seat body moves the male valve body against a spring to open a connection port. In the pipe automatic connection / disconnection joint that connects the pipes with each other, a pressure chamber for urging the female valve element in the closing direction is formed, and the pressure chamber and the female internal passage are connected via a throttle and the female valve is separately provided. A joint for an automatic pipe attaching / detaching device, comprising a check valve having a forward direction from a side internal passage to a pressure chamber.