JP2000179771A - Fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remote-control attaching and detaching for a piping as well as to automate them. SOLUTION: This fitting is provided with a first joint 1 having a projected part 1e in its one end side, a second joint 2 having an insertion part 2a inserted into the projected part 1e to be sealed, a recess 2c provided in an outer circumference of the insertion part 2a, a cam 25 journaled on the projected part 1e and engaged-and-disengaged with the recess 2c by turning to lock or unlock an insertion condition of the insertion part 2a with respect to the projected part 1e, an actuator mechanism 5 provided in an outer circumference of the first joint 1 and having a cylinder member 10 moving along an axial direction (an A-direction and a B-direction), and a link 24 connecting the cylinder member 10 movable axial-directionally and the turnable cam 25. The actuator mechanism 5 is operated by an operation part 23 disposed in a portion apart from the mechanism 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for attaching and detaching a pipe.

[0002]

2. Description of the Related Art In plant facilities such as chemical factories and food factories, fluid raw materials and intermediate products are often conveyed to each processing apparatus via piping. When the type or the production lot is switched in such a plant facility, an operation of switching a pipe connected to the processing apparatus to another pipe is performed.

At this time, if it is difficult to attach and detach the pipe,
Since quick switching is not possible, various pipe joints have been conventionally proposed and put into practical use so that pipes can be easily attached and detached. For example, Japanese Utility Model Laid-Open No. 63-47347
In the publication, as shown in FIG. 5, an elastic ring chuck 53 is provided on the insertion side 51a of a cylindrical pipe joint body 51 at an angle with respect to the axial direction, and a sliding ring 54 is provided in the axial direction. There has been proposed a pipe joint having a structure in which a lever 55 for slidably providing and a lever 55 for sliding a sliding ring 54 is provided rotatably.

In this configuration, when an operator performs an operation of rotating the lever 55 from the position indicated by the two-dot chain line in the drawing to the position indicated by the solid line in the drawing, the elastic ring chuck 53 is pressed through the sliding ring 54 and stands upright. Since the claws 53a of the elastic ring chuck 53 bite into the outer peripheral surface of the second pipe 57 to lock the second pipe 57, the first pipe 56 and the second pipe 57 can be easily connected. Also,
When the operation of rotating the lever 55 in the opposite direction is performed, the bite of the claw 53a is released by the operation reverse to the above, and the unlocked state is established. Therefore, the first pipe 56 and the second pipe 5
7 can be easily separated.

[0005]

However, in a configuration in which an operator turns the lever 55 to attach and detach the second pipe 57 as in the above-described conventional case, the second pipe 57 is not provided.
This requires a manpower at the time of switching, so that there is a problem in that automation of plant facilities and labor saving are obstructed. Further, every time the second pipe 57 is switched, the operator needs to go to the place of the pipe joint to perform the work, which places a heavy burden on the operator and requires the operator to secure a work space. There is also a problem of insufficient use.

Accordingly, the present invention is to provide a pipe joint which can automate the attachment and detachment of the pipe and can be remotely operated.

[0007]

According to a first aspect of the present invention, there is provided a first joint having a projecting portion on one end side and an inserting portion inserted into the projecting portion and sealed. A second joint, a concave portion provided on the outer periphery of the insertion portion, and a protrusion supported by the protrusion, which is engaged with the depression by rotation to lock or unlock the insertion state of the insertion portion with respect to the protrusion. A cam, actuator means provided on the outer periphery of the first joint and having a movable part that moves in the axial direction, and a link that connects the movable part that can move in the axial direction and the cam that can rotate. Wherein the actuator means is operated by an operation unit installed at a remote site. According to the above configuration, it is possible to remotely control switching between lock and unlock between the actuator unit and the operation unit located at a position remote from the actuator unit. Therefore, it is necessary for the operator to move to the place of the pipe joint and perform the switching operation. There is no. Accordingly, the burden on the operator can be reduced, and the work space of the operator is not required, so that the site area can be effectively used, and the attachment and detachment of the piping can be automated.

According to a second aspect of the present invention, in the pipe joint according to the first aspect, the actuator means has a piston member fixed to the first joint, and an inner periphery on which the Pitson member slides. A cylinder member slidably provided on the outer periphery of the first joint, and an urging means for urging the piston in a locking direction, wherein the operating portion is partitioned by the piston member. This is characterized in that it controls the supply of fluid acting in the unlocking direction to the working chamber. According to the above configuration, the actuator means can be configured with a minimum space.

According to a third aspect of the present invention, in the pipe joint according to the second aspect, the urging means is disposed between the piston member and the cylinder member to engage the cam with the recess. It is characterized in that the spring is biased in the moving direction. According to the above configuration, even if the fluid cannot be supplied due to a failure of the device or the pressure of the compressed air is lost, the spring maintains the locked state, so that high safety can be maintained. .

According to a fourth aspect of the present invention, in the pipe joint according to the first aspect, the concave portion has a shape extending in a tangential direction of an outer peripheral circle of the insertion portion, and the cam is in linear contact with the concave portion. It is characterized by being formed in. According to the above configuration, when the cam is engaged with the recess, the cam comes into line contact, so that the surface pressure is lower than that of the point contact, the wear is small, and the locked state can be maintained more reliably.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the pipe joint according to the present embodiment has a first joint 1 and a second joint 2 whose one ends are joined in a liquid-tight state. First
The joint 1 is formed in a tubular shape communicating with both ends, and a seal member such as an O-ring (not shown) is provided on an end surface of the other end of the first joint 1 (the side opposite to the second joint 2). The first fitting groove 1a to be fitted is formed in an annular shape.
The first joint 1 has a connecting groove 1b, a first sliding surface 1c, a second sliding surface 1d, and an annular protrusion 1e in this order from the other end to the one end. The connecting groove 1b is
A connector (not shown) that is provided on the entire outer peripheral surface of the joint 1 and that connects the first pipe 3 that is in contact with the end surface on the other end side of the first joint 1 is fitted. .

The first sliding surface 1c and the second sliding surface 1d are formed by processing the outer peripheral surface of the first joint 1 into a mirror surface. The first sliding surface portion 1c is set to have an outer diameter smaller than the outer diameter of the second sliding surface portion 1d so as to generate a step 1f at a boundary portion with the second sliding surface portion 1d. A second fitting groove 1g is formed near the step 1f in the first sliding surface 1c, and the seal member 4 is fitted in the second fitting groove 1g.

The protrusion 1e formed on one end of the second sliding surface 1d has a fixing flange 30 attached to the end. Further, the protruding portion 1e is formed so as to have an inner peripheral diameter larger than the outer diameter of the second joint 2. A third fitting groove 1k is formed on the inner peripheral surface of the protruding portion 1e, and a seal member 7 that is in contact with the end face on one end side of the second joint 2 is fitted into the third fitting groove 1k. ing. The seal member 7 may be provided on the inner periphery of the protruding portion 1e and the outer periphery of the insertion portion 2 described later. However, in consideration of cleanability, it is preferable that the seal is exposed to the internal flow path. Further, the protruding portion 1e is formed with a through hole 1h penetrating from the outer peripheral surface to the inner peripheral surface, and a link relief portion 1i rising from the through hole 1h in a concave curved shape toward one end. The through hole 1h and the link relief portion 1i are arranged at two positions facing each other via the axis O.

The first joint 1 constructed as described above includes:
A second joint 2 having the same inner diameter as the first joint 1 is connected. The second joint 2 is provided with the above-described protrusion 1e.
The insertion portion 2a is slidably inserted into the inner peripheral surface of the insertion portion 2a, and the flange portion 2b rises from the other end of the insertion portion 2a. On the outer peripheral surface of the insertion portion 2a, an elliptical concave portion 2c having a bottom portion formed in a tangential direction is formed at a position corresponding to the above-described through hole 1h. On the other hand, a bolt insertion hole 2d for fixing the second pipe 8 to the second joint 2 by bolting is formed in the flange portion 2b.

On the outer peripheral side of the first joint 1, an actuator mechanism 5 is provided. Each actuator mechanism 5 includes an annular piston member 6 fitted into the first sliding surface portion 1c, and a cylinder member 10 having an inner periphery on which the piston member 6 slides. The above piston member 6 is
By partitioning the internal space of the cylinder member 10,
A first working chamber 11 and a second working chamber 12 are provided in a cylinder member 10.
And is formed. The piston member 6 has one side surface in contact with the step portion 1f and the other side surface in contact with the stopper member 13 fixed to the first sliding surface portion 1c, so that the piston member 6 moves in the axial center O direction. It is in a fixed state. The inner peripheral surface of the piston member 6 is in contact with the seal member 4 of the second fitting groove 1g, and the outer peripheral surface of the piston member 6 is provided with a seal member 14. These seal members 4 The chamber 11 and the second working chamber 12 are partitioned so as to be airtight.

On the other hand, one end and the other end of the cylinder member 10 accommodating the piston member 6 are slidably inserted through the first sliding surface portion 1c and the second sliding surface portion 1d, respectively. A plurality of seal members 16 and 17 and dust seals 15 and 18 are provided on a sliding surface between the surface portions 1c and 1d. Further, a spring 19 is provided in the second working chamber 12. The spring 19 has one end fixed to the piston member 6, the other end fixed to the other end surface 12 a of the second working chamber 12, and the other end surface 12 a of the second working chamber 12.
a is urged in the direction away from the piston member 6 (direction B).

The cylinder member 10 has a first communication hole 10a for communicating the first working chamber 11 to the outside and a second communication hole 10b for communicating the second working chamber 12 to the outside. A compressor (not shown) is connected to the first communication hole 10a via an air pipe 20 and an electromagnetic valve 21. The solenoid valve 21 supplies compressed air from a compressor (not shown) to the first working chamber 11 to move the cylinder member 10 in the direction A when the solenoid valve 21 is turned on.
When the state is reached, the supply of the compressed air is stopped, the first working chamber 11 is opened to the atmosphere, and the cylinder member 10 is moved in the direction B by the spring 19.

The solenoid valve 21 is connected via a signal line 22a to an operation unit 23 installed in a central monitoring room or the like. The operation unit 23 has a proximity switch 31 connected to the signal line 2.
2b, the proximity switch 31 is provided on the outer peripheral surface of the protruding portion 1e, as shown in FIG. 3, and when the cylinder member 10 moves to an unlocked state, the proximity switch 31 Upon detection, an unlock state detection signal is output. And the operation unit 23
As shown in FIG. 1, by transmitting a switching signal (lock signal, unlock signal) to the solenoid valve 21 based on a command from an operator or a monitoring device, the solenoid valve 21 is switched to an ON state or an OFF state. And detects a state in which the insertion portion 2a of the second joint 2 can be inserted into and removed from the protrusion 1e of the first joint 1 based on the unlock state detection signal.

The cylinder member 10 which is moved back and forth in the direction A or B by switching the solenoid valve 21 as described above.
One end of a link 24 formed in a curved shape is rotatably provided on a first rotation shaft 27 at one end of the link.
One end of a cam 25 is rotatably connected to the other end of the link 24 by a second rotation shaft 28, and the other end of the cam 25 is connected to the protrusion 1 e by a third rotation shaft 29. It is rotatably connected. The engagement projection 25a on the third rotation shaft 29 side of the cam 25 is formed in a hemispherical shape, and the cam 25 is moved to the recess 2c of the second joint 2 when the cylinder member 10 moves in the B direction. The engagement projection 25a is engaged with the engagement projection 25a, and the engagement projection 25a is disengaged from the recess 2c when the cylinder member 10 moves in the direction A.

In the above configuration, the operation of the pipe joint will be described. In the following description, for convenience of description, it is assumed that the present invention is applied to a plant facility that supplies a processing device while switching a combination of raw materials and the like stored in a plurality of tanks.

First, as a preparatory stage, after the end face of the first joint 1 is brought into contact with the first pipe 3 on the tank side containing the raw materials and the like, the first joint 1 and the first pipe 3 are connected by a connecting tool (not shown). connect. Further, the end face of the second pipe 8 is brought into contact with the second pipe 8 on the processing device side, and the second joint 2 and the second
The pipe 8 is connected. The second pipe 8 can be relatively moved to an arbitrary position by a pipe moving device (not shown).

Next, in a centralized monitoring room, an operator or a monitoring device monitors the production status. When it is recognized that the type or the production lot needs to be switched, the pipe joint to be switched is specified so that the connection state of the next combination is established. Thereafter, the operator operates the operation unit 23 if the operation mode is set to the manual operation, and the monitoring device operates the operation unit 23 if the operation mode is set to the automatic operation, thereby unlocking the lock state of the specified fitting. Switch to locked state.

That is, an unlock signal is transmitted from the operation unit 23 and input to the solenoid valve 21 via the signal line 22.
The solenoid valve 21 is turned from OFF to O by an unlock signal.
By switching to the N state, compressed air from a compressor (not shown) is supplied to the first working chamber 11. As a result, the pressure of the compressed air acts on the wall surface of the first working chamber 11, whereby the cylinder member 10 moves in the direction A by overcoming the biasing force of the spring 19 in the direction B.

When the cylinder member 10 moves in the direction A,
The urging force in the direction A acts on the link 24 and the cam 25 that lock the pipe joint by engaging the engaging projection 25a of the cam 25 with the recess 2c of the second joint 2. At this time, since the first rotating shaft 27 and the third rotating shaft 29 are fixed to the cylinder member 10 and the protruding portion 1e, respectively, the link 2 supported by the rotating shafts 27 and 29 is provided.
4 and the other end of the cam 25 are connected to the cylinder member 1.
0 and the protruding portion 1e are in a state of being rotatably fixed respectively. On the other hand, the second rotating shaft 28 connecting the link 24 and the cam 25 is movable.
As a result, the link 24 rotates about the first rotation shaft 27 as a rotation center, and the cam 25 rotates about the third rotation shaft 29 as a rotation center. The rotation shaft 28 moves in the direction A.

Thereafter, as shown in FIG. 2, the hemispherical engaging projection 25a of the cam 25 is sufficiently disengaged from the concave portion 2c of the second joint 2, and the cam 25 is
By moving to a position outside the outer peripheral surface of a, the pipe joint is switched to the unlocked state.

When the cylinder member 10 for rotating the link 24 and the cam 25 is moved to the unlocked position, as shown in FIG.
Detects the cylinder member 10 and transmits an unlocked state detection signal. The unlocked state detection signal is input to the operation unit 23 in FIG. 1, and when detecting the input of the unlocked state detection signal, the operation unit 23 notifies the operator and the monitoring device of the unlocked state. .

When the operator or the monitoring device confirms the unlocked state, the second joint 2 is pulled out of the first joint 1 to the pipe moving device (not shown) via the operation section 23, and then the next second pipe 8 To attach the second joint 2 to the first joint 1. As a result, the pipe moving device first
The joint 2 is moved in the direction of the axis O so as to be separated from the first joint 1 and withdrawn from the first joint 1. Thereafter, the second joint 2 connected to the second pipe 8 to be switched next is moved so as to coincide with the axis O of the first joint 1 and then horizontally moved in the direction of the first joint 1 so as to project. 1e. Then, a signal indicating that the attachment of the second joint 2 to the first joint 1 has been completed is transmitted to the operation unit 2.
Send to 3.

When confirming the attachment of the second joint 2, the operating section 23 transmits a lock signal to the solenoid valve 21 as shown in FIG. 1, and switches the solenoid valve 21 from the ON state to the OFF state. The electromagnetic valve 21 switched to the OFF state stops the supply of the compressed air, opens the first working chamber 11 to the atmosphere, and releases the compressed air in the first working chamber 11 to the atmosphere. As a result, the pressure of the compressed air acting on the wall surface of the first working chamber 11 disappears, so that the biasing force of the spring 19 in the second working chamber 12 causes the cylinder member 10 to move in the direction B. .

When the cylinder member 10 moves in the direction B,
By the operation reverse to the unlocking operation described above, the link 24
And the second rotation shaft 28 between the cam 25 and the cam 25 moves in the B direction. When the cam 25 rotates in this manner, the hemispherical engaging projection 25a of the cam 25 engages with the concave portion 2c of the second joint 2, and the engaging convex portion 25a contacts the concave portion 2c in a dot-like manner. While contacting, the second joint 2 is moved in the direction B via the recess 2c. Thereby, the first joint 1 and the second joint 2 are joined in a locked state. During this joining, since the seal member 7 is compressed and deformed and is exposed in the internal passage of the pipe joint, the amount of the raw material remaining at the joint between the first joint 1 and the second joint 2 can be extremely reduced. .

As described above, the pipe joint of the present embodiment includes the first joint 1 having the protruding portion 1e on one end side and the second joint 2 having the insertion portion 2a inserted into the protruding portion 1e and sealed.
And a concave portion 2c provided on the outer periphery of the insertion portion 2a, and a cam 25 which is pivotally supported by the projection portion 1e and is engaged with the depression portion 2c by rotation to lock or unlock the insertion state of the insertion portion 2a with respect to the projection portion 1e. And an actuator mechanism 5 (actuator means) provided on the outer periphery of the first joint 1 and having a cylinder member 10 (movable part) that moves in the axial direction (A direction and B direction), and a cylinder member that is movable in the axial direction The actuator mechanism 5 is provided with a link 24 for connecting the rotatable cam 25 with the cam 10. The actuator mechanism 5 is configured to be operated by an operation unit 23 installed at a remote location.
The above-described actuator mechanism 5 can also be applied to a self-sealing type pipe joint.

According to the above arrangement, the switching between the lock and the unlock can be remotely controlled by the operation unit 23 located at a position remote from the actuator mechanism 5.
There is no need for the operator to move to the location of the fitting to perform the switching operation. Accordingly, the burden on the operator can be reduced, and the work space of the operator is not required, so that the site area can be effectively used, and the attachment and detachment of the piping can be automated.

Further, in the present embodiment, the actuator mechanism 5 includes the piston member 6 fixed to the first joint 1.
And an inner periphery on which the piston member 6 slides.
And a cylinder member 10 slidably provided on the outer periphery of the cylinder.
It is configured to control the supply of compressed air (fluid) to the working chamber 11). In the present embodiment, compressed air is used as the fluid, but the present invention is not limited to this, and oil may be used. In this configuration, since the cylinder member 10 is provided on the outer periphery of the first joint 1, the actuator mechanism 5 can be mounted in a minimum space.
Can be configured.

In this embodiment, a spring 19 for urging the second working chamber 12 between the piston member 6 and the cylinder member 10 in the moving direction (direction B) for engaging the cam 25 with the recess 2c. Is provided. According to this configuration, even when the compressed air cannot be supplied due to a failure of the device or the pressure of the compressed air is lost, the spring 19 maintains the locked state, and thus high security is maintained. be able to.

In the present embodiment, the second working chamber 1
2 is provided with a spring 19, and the switching from the unlocked state to the locked state is performed by using the urging force of the spring 19; however, the present invention is not limited to this, and the second communication hole 10b of the cylinder member 10 may be used. By connecting the air pipe 20 and supplying compressed air to the second communication hole 10b, the actuator mechanism 5 is changed from a single-acting cylinder structure to a double-acting cylinder structure, and is switched to an unlocked state by compressed air. Is also good. In this case, the solenoid valve 21
A 4-port 2-position valve is adopted instead of a 2-port 2-position valve.

In the present embodiment, the engaging projection 25a of the cam 25 and the recess 2c of the second joint 2 are each formed in a hemispherical shape, and the engaging projection 25a is engaged with the recess 2c to form a point contact. Although the locked state is maintained by performing this, the present invention is not limited to this. That is, as shown in FIG. 4, the concave portion 2c 'is formed in a shape extending in the tangential direction of the outer circumferential circle of the insertion portion 2a, and the engaging convex portion 25a' is formed so as to make linear contact with the concave portion 2c '. The configuration may be as follows. In this configuration, when the engaging projection 25a 'of the cam 25' comes into linear contact with the recess 2c ', the surface pressure is lower than the point contact and the abrasion is less. Can be maintained more reliably. Furthermore, when the end surfaces of the first joint 1 and the second joint 2 are air-tightly connected to each other with the seal member 7 interposed therebetween as in the present embodiment, the cam 25 ′ and the recess 2c ′ are less worn, and Since the position of the end face does not recede, the sealing member 7 can be appropriately compressed to maintain the sealing property, thereby increasing the durability.

[0036]

According to the first aspect of the present invention, there is provided a first joint having a projecting portion on one end side, a second joint having an inserting portion inserted into the projecting portion and sealed, and provided on the outer periphery of the inserting portion. A recessed portion, a cam pivotally supported by the protruding portion, engaged with the recessed portion by rotation to lock or unlock the insertion state of the insertion portion with respect to the protruding portion, and a cam provided on the outer periphery of the first joint. Actuator means having a movable part that moves in the axial direction, and a link that connects the movable part that is movable in the axial direction and the cam that is rotatable, and the actuator means is installed at a remote location. This is a configuration that is operated by the operating unit. According to the above configuration, it is possible to remotely control switching between lock and unlock between the actuator unit and the operation unit located at a position remote from the actuator unit. Therefore, it is necessary for the operator to move to the place of the pipe joint and perform the switching operation. There is no. Accordingly, the burden on the operator can be reduced, and the work space of the operator is not required, so that the site area can be effectively used, and furthermore, the attachment and detachment of the piping can be automated. To play.

According to a second aspect of the present invention, there is provided the pipe joint according to the first aspect, wherein the actuator has a piston member fixed to the first joint and an inner periphery on which the Pitson member slides. A cylinder member slidably provided on the outer periphery of the first joint, and an urging means for urging the piston in a locking direction, wherein the operating portion is partitioned by the piston member. This is a configuration for controlling the supply of the fluid acting in the unlocking direction to the working chamber. According to the above configuration, there is an effect that the actuator unit can be configured with a minimum space.

According to a third aspect of the present invention, in the pipe joint according to the second aspect, the urging means is disposed between the piston member and the cylinder member, and the cam is engaged with the concave portion. This is a configuration in which the spring is biased in the moving direction. According to the above configuration, even if the fluid cannot be supplied due to a failure of the device or the pressure of the compressed air is lost, the spring maintains the locked state, so that high safety can be maintained. This has the effect.

According to a fourth aspect of the present invention, in the pipe joint according to the first aspect, the concave portion has a shape extending in a tangential direction of an outer peripheral circle of the insertion portion, and the cam is in linear contact with the concave portion. It is the structure formed in. According to the above configuration, since the cam comes into line contact with the concave portion, the locked state can be more reliably maintained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a locked state of a pipe joint.

FIG. 2 is an explanatory view showing an unlocked state of a pipe joint.

FIG. 3 is an explanatory diagram illustrating a state where a cylinder member is detected by a proximity switch.

FIG. 4 is an explanatory view showing an engagement state of a cam with a concave portion.

FIG. 5 shows a conventional example, and is an explanatory view showing an unlocked state and a locked state of a pipe joint.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 First joint 1b Connecting groove 1c First sliding surface 1d Second sliding surface 1e Projection 1f Step 1g Second fitting groove 1h Through hole 1i Link relief 2 Second joint 2a Insert 2b Flange 2c Concave 2d Bolt insertion hole 3 First pipe 4 Seal member 5 Actuator mechanism 6 Piston member 7 Seal member 8 Second pipe 10 Cylinder member 11 First working chamber 12 Second working chamber 13 Stopper member 14 Seal member 19 Spring 20 Air pipe 21 Electromagnetic Valve 23 Operation part 24 Link 25 Cam 25a Engagement convex part 27 First rotation axis 28 Second rotation axis 29 Third rotation axis 31 Proximity switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Haruki Fukui 1-16-117, Fukuyoshidai, Nishi-ku, Kobe City, Hyogo Prefecture Inside Nabco Seishin Plant Co., Ltd. No. F-term (reference) for Nabco Tokyo branch office 3J106 AB01 BA01 BB01 BC04 BD05 BD07 BE29 CA19 EA03 EB02 EC02 EC07 ED38 EE03 EF04 EF05

Claims (4)

[Claims] 1. A first joint having a projecting portion on one end side, a second joint having an insertion portion inserted into the projecting portion and connected to the first joint, and provided on an outer periphery of the inserting portion. A recessed portion, a cam pivotally supported by the projecting portion, and being engaged with the recessed portion by rotation to lock or unlock a connection state in which the insertion portion is inserted into the projecting portion; and an outer periphery of the first joint. Actuator means having a movable part that moves in the axial direction, and a link connecting the movable part that can move in the axial direction and the cam that can rotate, wherein the actuator means is separated A pipe joint characterized by being operated by an operation unit installed at a site. 2. The cylinder according to claim 1, wherein said actuator has a piston member fixed to said first joint, and an inner periphery on which said Pitson member slides, and is slidably provided on an outer periphery of said first joint. A biasing means for biasing the piston in a locking direction, wherein the operating unit controls supply of a fluid acting in an unlocking direction to a working chamber defined by the piston member. The pipe joint according to claim 1, wherein: 3. The spring according to claim 1, wherein the biasing means is a spring disposed between the piston member and the cylinder member and biasing the cam in a moving direction for engaging the cam with the recess. 2. The pipe joint according to 2. 4. The pipe joint according to claim 1, wherein said concave portion has a shape extending in a tangential direction of an outer peripheral circle of said insertion portion, and said cam is formed so as to make linear contact with said concave portion.