JPH0620951Y2 - Fluid blow type cleaning device for flow path joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a flow channel joint used for quickly connecting or disconnecting an intermediate part of a hydraulic pipe in a hydraulic clamp device for fixing a work of a machine tool, for example. Among them, the present invention relates to a fluid blow-type cleaning device for a flow passage joint, in which foreign matter adhering to a fitting portion is blown with a cleaning fluid during a fitting operation of a socket and a plug constituting the flow passage joint.

<< Basic Structure as Premise >> Some fluid blow-type cleaning devices of this type of flow passage joint have the following basic structure.

For example, as shown in FIG. 1 to FIG. 7, or FIG. 8 and FIG. 9, a connecting insertion portion 161 is formed on the distal end side portion of the plug body 153 of the plug 52, and the distal end surface of the connecting insertion portion 161 is formed. 161
The plug side flow path 160 is opened in a, the annular sealing abutment part 189 is provided on the outer surface of the connection insertion part 161, and the plug receiving port 61 is recessed in the tip side part of the socket body 53 of the socket 51. The inner side surface of the plug receiving port 61 is formed by opening the socket-side flow channel 60 in the rear end surface 61a of the plug receiving port 61, and providing an annular sealing abutment portion 89 on the inner surface of the plug receiving port 61. In a state in which the cleaning fluid F ejection ports 85 are opened at at least a plurality of positions in the circumferential direction of 61b and the socket 51 and the plug 52 are being connected, the cleaning fluid F ejected from the ejection port 85 is The tip end surface 161a and the outer peripheral surface 161b of the connecting insertion portion 161 are sprayed to clean them, and in the state where the socket 51 and the plug 52 are connected, both sealing contact portions 89/189. Contact abuts to each other, which is constituted so as to seal between the fitting surface between the connection insertion portion 161 and the plug inlet 61.

<< Prior Art >> In the above-mentioned basic structure, as a structure of a portion for blowing foreign matter with the cleaning fluid F, there is conventionally a structure disclosed in Japanese Utility Model Laid-Open No. 60-52496 previously proposed by the present inventor.

Conventional Example 1 As shown in FIGS. 8 and 9, this is for sealing each in the central portion of the inner peripheral surface 61b of the plug receiving opening 61 and the central portion of the outer peripheral surface 161b of the connecting insertion portion 161. Contact part 89 ・ 18
9 is formed, and the ejection port 85 of the cleaning fluid F is opened obliquely forward at the inlet of the inner peripheral surface 61b of the plug receiving port 61.

Conventional Example 2 This is a modification of the above Conventional Example 1,
As shown by the two-dot chain line in FIG. 8, the ejection port 85 of the cleaning fluid F is replaced with the inner part of the inner peripheral surface 61b of the plug receiving port 61.

<< Problems to be Solved by the Invention >> The above-mentioned conventional examples have the following problems.

Conventional Example 1 At the time of connecting operation of the flow path joint 26, the cleaning fluid F can be sprayed onto the distal end surface 161a and the outer peripheral surface 161b of the connection insertion portion 161, and the foreign matter attached thereto can be blown.

However, the cleaning fluid F is fed to the inner peripheral surface 6 of the plug receiving port 61.
It cannot be sprayed onto the 1b and the rear end surface 61a. For this reason, the foreign matter adhered here is prevented from coming into contact with the sealing contact portion 89.1.
It may be caught between the fitting surfaces of 89 to damage it, or may enter into the socket side flow path 60 or the plug side flow path 160.

Conventional Example 2 In this case, the cleaning fluid F can pass through the inside of the plug receiving port 61, but it cannot be sprayed onto the inner end surface 61a and also cannot be strongly sprayed onto the inner peripheral surface 61b.

Further, when the connecting insertion portion 161 starts to be fitted into the plug receiving opening 61, the plug receiving opening 61 is closed and the cleaning fluid F does not flow, so that the outer peripheral surface 161b of the connecting insertion portion 161 cannot be cleaned.

Therefore, cleaning is insufficient as compared with the conventional example 1.

An object of the present invention is to prevent foreign matter from being caught in the sealing contact portion and from entering into the socket channel or the plug-side channel.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention is characterized in that, in the basic structure described above, the structure of the portion for blowing foreign matter with the cleaning fluid F is configured as follows. There is.

For example, as shown in FIGS. 1 to 7, the sealing contact portion 89 of the socket 51 is connected to the plug receiving port 61.
Is provided on the rear end surface 61a of the plug 52, and the sealing contact portion 189 of the plug 52 is provided on the distal end surface 161a of the connection insertion portion 161.
The cleaning fluid F ejection port 85 is provided at the inner side of the inner peripheral surface 61b of the plug receiving port 61, and the ejection port 85
Is oriented so that the cleaning fluid F is sprayed onto the inner end surface 61a of the plug receiving port 61 and the sealing contact portion 89, and in the state where the socket 51 and the plug 52 are being connected, The cleaning outflow passage C of the cleaning fluid F is formed over the entire length between the fitting peripheral surfaces of the plug receiving opening 61 and the connecting insertion portion 161.

<< Operation >> The present invention operates as follows, for example, as shown in FIGS. 7 (a) (b) (c).

At the start of connection of the flow path joint 26, the cleaning fluid F is (a)
As shown in the figure, after blown off the foreign substances adhering to the back end face 61a of the plug receiving opening 61 and the sealing contact portion 89 by flowing from each ejection port 85 of the socket 51 in the centering direction, the center of the plug receiving opening 61 is blown. It is blown from the department to the front side.

When the plug receiving opening 61 and the connecting insertion portion 161 start to be fitted, the cleaning fluid F flows in the centrifugal direction on the distal end surface 161a of the connecting insertion portion 161 as shown in FIG. Blow off the adhered foreign matter, and then the cleaning outflow path C
Flowing in the positive direction, the inner peripheral surface 61b of the plug receiving port 61
Also, the foreign matter attached to the outer peripheral surface 161b of the connection insertion portion 161 is blown. Then, as shown in (c), the contact parts 89 and 189 for sealing contact each other, and the socket-side channel 60
And the plug-side flow path 160 communicate with each other in a hermetically sealed manner.

In this way, the rear end surface 61a and the inner peripheral surface 61b of the plug receiving opening 61, and the front end surface 161a of the connection insertion portion 161.
Since the outer peripheral surface 161b can be cleaned without omission, it is possible to prevent foreign matter from being caught in the sealing contact portions 89 and 189, and to prevent foreign matter from entering the socket-side flow passage 60 and the plug-side flow passage 160.

<Effect of device> According to the device of the present invention, a cleaning fluid is used when connecting the flow path joint,
Forcibly blow off any foreign matter that adheres to the back end face of the plug receiving port, the sealing contact part, the tip face of the connecting insertion part, the inner peripheral surface of the plug receiving port, or the outer peripheral surface of the connecting insertion part to form a socket. You can clean the plug fittings without omission. Therefore, it is possible to prevent foreign matter from being caught in the sealing contact portions and from entering into the socket-side flow path and the plug-side flow path.

<< Embodiment >> An embodiment of the present invention will be described below with reference to FIGS.

FIG. 2 shows a hydraulic clamp 2 provided on a work pallet 1 for a machining center and a coupling means 3 for supplying and discharging pressure oil.
The whole system diagram of the apparatus which supplies / discharges pressure oil with the pressure oil supply / discharge means 4 is shown.

A work W and a plurality of hydraulic clamps 2 are placed on the upper surface of the work pallet 1, and each hydraulic clamp 2 is as follows.

When clamping the work W, the work pallet 1 and the pressure oil supply / discharge means 4 are connected by the coupling means 3, and pressure oil is supplied to the clamp drive oil chamber 8 formed on the left side of the piston 7 in the double-acting hydraulic cylinder 6. The pressure oil is supplied and discharged from the unclamp drive oil chamber 9 formed on the right side of the piston 7. Then, the piston 7 and the piston rod 10 advance to the right, and the clamp claw 11 is inserted through the piston rod 10.
Is switched to the clamped state indicated by the broken line. The work pallet 1 is separated from the pressure oil supply / discharge means 4 in this clamped state, and then the work pallet 1 is carried into a machining center (not shown) to process the work W. Reference numeral 12 is a clamp state holding spring.

On the other hand, when the work W is unclamped, the work pallet 1 and the pressure oil supply / discharge means 4 are reconnected by the coupling means 3 to supply the pressure oil to the unclamp drive oil chamber 9 and also to release the clamp drive oil. The pressure oil is discharged from the chamber 8. Then, the piston 7 and the piston rod 10 retreat to the left side against the clamped state holding spring 12, and the clamp claw 11 is switched to the unclamped state shown in the solid line in accordance with the backward movement of the piston rod 10.

Reference numeral 13 is a reserve cylinder for holding the clamp pressure, and reference numeral 14 is a balancing cylinder.

The pressure oil supply / discharge means 4 will be described below. The pressure oil supply / discharge means 4 has a booster pump 17 that discharges pressure oil by supplying compressed air from an air pressure source 16. The clamp drive switching valve 2 is provided in the clamp drive oil passage 18 and the unclamp drive oil passage 19 led out from the discharge port of the booster pump 17.
0 and the unclamp drive switching valve 21 are respectively interposed. By switching the clamp drive switching valve 20 to the supply position and switching the unclamp drive switching valve 21 to the discharge position, the hydraulic clamp 2 is clamp-driven via the coupling means 3. On the other hand, while switching the unclamp drive switching valve 21 to the pressure supply position,
By switching the clamp drive switching valve 20 to the discharge device, the hydraulic clamp 2 is unclamped via the coupling means 3. The switching operation of the switching valves 20 and 21 is performed by the pilot valves 22 and 23, respectively.

Next, the coupling means 3 will be described.
This has two flow path joints, a clamp drive flow path joint 26 and an unclamp drive flow path joint 27. Each flow path joint 26, 27 has a check valve on both sides and a spill stop valve. It consists of a quick joint for liquid. The clamp drive passage joint 26 connects or disconnects the clamp drive oil chamber 8 of the hydraulic clamp 2 and the clamp drive oil passage 18 of the pressure oil supply / discharge means 4. Further, the unclamp drive flow path joint 27 is used to connect the unclamp drive oil chamber 9 of the hydraulic clamp 2 and the pressure oil supply / discharge means 4.
Unclamp drive oil passage 19 is connected or disconnected.
The structure and operation of the coupling means 3 will be described below with reference to the system diagram of FIG. 2, the plan view of FIG. 3 and the three-dimensional view of FIG.

The pneumatic cylinder 30 is fixed to the upper surface of the coupling fixing base P, and the work pallet 1 is carried in to a predetermined position on the right side of the pneumatic cylinder 30 and positioned and fixed. A forward pneumatic driving chamber 32 is formed on the left side of the piston 31 of the pneumatic cylinder 30, and a backward pneumatic driving chamber 33 is formed on the right side. At one end of a piston rod 34 protruding rightward from the piston 31, sockets 51, 51 which are one joint of each flow passage joint 26, 27 are fixed via a mounting bracket 35. Correspondingly, each channel joint 26/27
The other joint, the plug 52, is fixed to the left part of the work pallet 1. Further, a forward detection limit switch 37 and a backward detection limit switch 38 are fixed side by side on the upper side of the pneumatic cylinder 30. These limit switches 37 and 38 can be pushed in by a forward movement detecting operation rod 39 and a backward movement detecting operation rod 40 which are provided so as to project leftward from the bracket 35. Further, a clamp pressure detecting limit switch 42 is fixed to the lateral side of the sockets 51, 51 corresponding to the piston rod 13a of the reserve cylinder 13 fixed to the left part of the work pallet 1.

The above-mentioned coupling means 3 operates as follows.

When the clamp operation switch (not shown) is turned on in the illustrated unclamp separated state, first, the air pressure switching valve 43
Compressed air is supplied into the forward air pressure drive chamber 32 via, and the piston 31 and the piston rod 34 move forward to the right. Accompanying this, the sockets 51, 51 move forward to the right and are connected to the plugs 52, 52. Then, the forward movement detecting operation rod 39 pushes in the forward movement detecting limit switch 37, and the pilot detecting valve 39 is operated via the pilot valves 22 and 23.
The clamp drive switching valve 20 is switched to the pressure supply position, the unclamp drive switching valve 21 is switched to the discharge position, and the hydraulic cylinder 6 of the hydraulic clamp 2 is extended. When this is sufficiently extended and the work W is clamped, the pressure switch 45 provided in the clamp drive oil passage 18 rises to the clamp setting pressure, and the piston rod 13a of the reserve cylinder 13 extends to detect the clamp pressure. The limit switch 42 is pushed and operated.

Then, after a lapse of a predetermined time, the pneumatic pressure switching valve 43 is switched to supply compressed air to the backward pneumatic driving chamber 33, and the socket 5 via the piston 31 and the piston rod 34.
Retract 1.51 to the left. As a result, the hydraulic clamp 2 is separated in the clamped state. At the same time, the reverse detection operation rod 40 is pushed to operate the reverse detection limit switch 38, and it is detected that the separated state is achieved.

In the above operation, the compressed air of the air pressure source 16 is supplied from the air blow air pressure switching valve 48 between the time when the clamp operation switch (not shown) is turned on and the time when the forward movement detection limit switch 37 is operated. It is supplied to each socket 51. As a result, the foreign matter attached to the tip portions of the sockets 51 and 51 and the tip portions of the plugs 52 and 52 is blown by the compressed air that is the cleaning fluid, and the connection between the sockets 51 and the plugs 52 is smoothly performed. .

On the other hand, when the hydraulic clamp 2 is switched from the clamped state to the unclamped state, if the unclamp operation switch (not shown) is turned on, each socket 51, 51 and each plug 52, 52 are connected to each other in the same manner as above. Is connected and the forward movement detection limit switch 37 is activated,
Pressure oil is supplied to the unclamp drive oil chamber 9 of the hydraulic clamp 2 via the unclamp drive switching valve 21, and pressure oil in the clamp drive oil chamber 8 is discharged via the clamp drive switching valve 20. It As a result, the pressure switch 46 of the unclamp drive oil passage 19 performs the pressure drop detection operation, and the clamp pressure detection limit switch 4
2 is deactivated. After a lapse of a predetermined time, compressed air is supplied to the retracting pneumatic drive chamber 33 via the pneumatic switching valve 43, and the sockets 51, 51 retract to the left. As a result, the hydraulic clamp 2 is separated in the unclamped state. At the same time, the reverse detection operation rod 49 pushes the reverse detection limit switch 38 to detect that the separation state has been reached.

In the coupling means 3 having the above structure, the two flow path joints 26 and 27 have the same structure, and the specific structure thereof will be described below with reference to FIGS. 1 and 5 to 7.
1 is a vertical cross-sectional view showing a separated state of the flow path joint, FIG. 5 is a cross-sectional view taken along the line VV of FIG. 1, and FIG. 6 is an enlarged view of a main part showing a connection start state of the flow path joint. , FIG. 7 shows an operation explanatory view.

In FIG. 1, first, the socket 51 will be described. In the socket main body 53, this is the plug receiving port 61 / socket side from the front end side (right side in the figure) JA to the rear end side (left side in the figure) UA. The flow passage 60 and the oil supply / drainage port 62 are sequentially formed, and the check valve body 54
Anti-spill valve body 55, anti-spill valve cylinder 56, check valve spring 57
A spill stop valve cylinder spring 58 and a rod 59 are provided.

That is, the plug receiving port 61 is formed in the central portion of the front end side JA of the socket main body 53, and the socket side flow passage 60 is opened in the rear end face 61 a of the plug receiving port 61. Inside the socket-side flow passage 60, in order from the right side to the left side, the anti-spill valve cylinder chamber 63, the rod chamber 64, the annular first filter chamber 65 formed outside the rod chamber 64, the check valve chamber 66, A second filter chamber 67 is formed. A tubular filter 68 is mounted in the first filter chamber 65, and a disc filter 69 is mounted in the second filter chamber 67. Also,
The check valve body 54 and the check valve spring 57 are inserted into the check valve chamber 66. Further, the anti-spill valve cylinder 5 is placed in the anti-spill valve cylinder chamber 63.
6 is inserted.

A circular anti-spill valve opening surface 71 is formed at the tip of the cylinder hole 56a of the anti-spill valve opening 56, and the anti-spill valve body 55 is slidably fitted in the anti-spill valve opening surface 71.

Further, the spill stop valve body 55 and the check valve body 54 are connected to the rod 5
Connected at 9. The check valve body 54 is pressed to the right by the check valve spring 57 in the check valve chamber 66, and the check valve chamber 66 is pressed.
The check valve seat 72 is closed. The rod 59 is divided into a front rod 73 and a rear rod 74,
An anti-spill valve body 55 is integrally formed at the tip of the front rod. On the one hand, these rods 73 and 74 transmit the leftward movement of the anti-spill valve body 55 to the check valve body 54 by an external force to open the check valve body 54, and on the other hand,
The front rod 73 restricts the rightward movement of the anti-spill valve body 55 by the locking portion 73a.

Further, the anti-spill valve cylinder 56 is provided in the anti-spill valve cylinder chamber 63.
It is configured to be pushed to the right by the anti-spill valve cylinder spring 58 so that the anti-spill valve opening surface 71 is closed by the anti-spill valve body 55. Then, in the closed state of the anti-spill valve body 55, the front and rear spaces thereof are communicated with each other through a fitting gap 75 having a small cross-sectional area (see FIG. 6), but the fitting gap 75 is so small that it operates. The anti-spill valve cylinder chamber 63 is liquid-sealed by the surface tension of oil.

Further, as shown in FIGS. 1 and 5 above, the socket 51
Is provided with an aligning device 77 for butt connection.

That is, the eccentricity allowance cylinder 78 is inserted into the right side of the socket body 53 so as to be able to move in a radial direction in a tightly sealed manner. This eccentricity allowance cylinder 78
Is a connection base cylinder 79 having a plug receiving opening 61.
And a guide tube 80 fitted inside the guide tube 80.
Are held in the central position by a plurality of positioning springs 81. The anti-spill valve cylinder 56 is inserted into the cylindrical hole of the guide cylinder 80 so as to be movable in a tight and tight manner in the front-rear direction. Further, the declination allowance ring 82 is fitted onto the tip of the anti-spill valve cylinder 56 so that the declination can be swung freely, and an annular ring formed of an O ring is provided between the declination allowance ring 82 and the anti-spill valve cylinder 56. The sealing means 84 is fitted. A sealing contact portion 89 is formed on the tip end surface of the sealing means 84. Then, in the connected state of the flow path joint 26 (see FIG. 6), the connecting insertion portion 161 of the plug 52 is configured to be able to press the anti-spill valve cylinder 56 to the left side via the declination allowance ring 82.

Further, at a plurality of positions in the circumferential direction of the inner peripheral surface 61b of the plug receiving opening 61, the ejection ports 85 of the compressed air F which is the cleaning fluid are ejected.
Is opened. That is, these ejection ports 85 are formed in the inner peripheral surface 61 b of the plug receiving port 61 and are located inside the deviation angle allowing ring 8.
2 is formed on the tip surface. The axis of each ejection port 85 is oriented in the direction in which the compressed air F is blown to the inner end surface 61a of the plug receiving port 61 and the sealing contact portion 89. Each of the ejection ports 85 is communicated with the air blow air supply port 87 through a plurality of communication holes 86 formed in the connection mouthpiece cylinder 79. The positioning spring 81 is inserted in each of the communication holes 86.

Next, the plug 52 will be described. This is from the front end side (left side in the figure) JB of the plug body 153 toward the rear end side (right side in the figure) UB. The oil supply / drain port 162 is formed, and the check valve body 154 and the spill stop valve body 155 are provided in the plug side flow passage 160.
A check valve spring 157, a spill stop valve spring 158 and a rod 159 are provided.

That is, the plug-side flow path 160 is opened in the distal end surface 161a of the connection insertion portion 161, and the annular sealing contact portion 18 is formed corresponding to the sealing contact portion 89 of the socket 51.
9 is formed. Then, as shown in FIG. 6, in a state where the socket 51 and the plug 52 are connected to each other, the sealing contact portions 89 and 189 are in contact with each other, so that the plug receiving opening 61 and the connecting insertion portion 161 are connected. The mating surfaces are sealed.

Inside the plug-side flow path 160, a spill stop valve chamber 163, a rod chamber 164, an annular first filter chamber 165, and a check valve chamber 1
66. The second filter chamber 167 is formed. The tubular filter 168 is mounted in the first filter chamber 165, and the spill stop valve chamber 163 is inserted through the tubular filter 168 to the check valve chamber 16.
It is connected to 6. Further, the disc filter 169 is mounted in the second filter chamber 167. The check valve body 154 and the check valve spring 157 are inserted into the check valve chamber 166, and the spill stop valve body 155 is inserted into the spill stop valve chamber 163. Further, a circular anti-spill valve opening surface 171 is formed at the tip of the anti-spill valve chamber 163.
The anti-spill valve body 155 is slidably fitted into the anti-spill valve opening surface 171. Further, a rod 159 is interposed in the rod chamber 164 between the anti-spill valve body 155 and the check valve body 154.

The check valve body 154 is provided in the check valve chamber 166 with the check valve spring 1
The check valve seat 1 of the check valve chamber 166 is pressed to the left by 57.
The valve is closed to 72. Further, the rod 159 prevents the spill stop valve body 155 from moving to the right due to an external force.
4 to open the check valve body 154.

On the other hand, the anti-spill valve body 155 is pushed to the left by the anti-spill valve spring 158 in the anti-spill valve chamber 163,
On the other hand, the anti-spill valve opening surface 171 of the anti-spill valve chamber 163 is closed, while on the other hand, the anti-skid valve opening surface 171 is opened by being pushed to the right by an external force. In the closed state of the anti-spill valve body 155, the front and rear spaces are communicated with each other by a fitting gap 175 having a small cross-sectional area (see FIG. 6), but the fitting gap 175 is very small, so that the operation is performed. The anti-spill valve chamber 163 is liquid-sealed by the surface tension of the oil.

The flow path joint 26 having the above-described configuration includes the socket 51 and the plug 52.
When they are connected to each other by abutting each other, they operate as follows, as shown in FIG.

When the connection operation is started in the state shown in (a), the socket 5
1 starts to move forward, and the sealing means 8 for the socket 51
The sealing abutment portion 89 formed on the tip end surface of No. 4 is cleaned by blowing compressed air (cleaning fluid) F.

In the state where the socket 51 and the plug 52 are in the middle of fitting, as shown in (b), compressed air is provided over the entire length between the fitting peripheral surfaces of the plug receiving opening 61 and the connecting insertion portion 161. A cleaning outflow passage C for the (cleaning fluid) F is formed. As a result, the compressed air F ejected from the ejection port 85 is blown onto the tip end surface 161a and the outer peripheral surface 161b of the connection insertion portion 161. Subsequently, as shown in FIG. 7C, the fitting means seals the sealing surfaces of the plug receiving port 61 and the connecting insertion portion 161.

Next, as shown in FIG. 3D, the anti-spill valve cylinder 56 is pushed into the left rear end side UA by the connecting insertion portion 161 of the plug 52. As a result, the rods 59 and 159 contact each other, and the rod 159 compresses the anti-spill valve spring 158 to contact the check valve body 154.

Further, the anti-spill valve bodies 55, 155 abut against each other and are pushed into the rear end sides UA, UB to operate as follows.

First, as shown in (e), the check valve body 5 of the socket 51 is
4 compresses the check valve spring 57 to open the valve. Next, the check valve body 154 of the plug 52 compresses the check valve spring 157 to start opening the valve, and along with this, the both anti-spill valve bodies 55 and 155 start opening the valve.

Then, as shown in FIG. 5 (f), all the valves 54.5 are held in the state where the anti-spill valve cylinder 56 is received by the socket body 53.
5. ・ 154 ・ 155 are fully opened and the connection is completed.

On the other hand, from the connection state in (f) above, socket 5
When the 1 and the plug 52 are pulled apart from each other and separated from each other, they operate as follows.

The check valve spring 157 of the plug 52 expands by retracting the socket 51 to the rear end side UA side on the left side. First, as shown in (e), the anti-spill valve body 155 closes. At the same time, the check valve body 154 closes. Then, as shown in FIG. 3D, the check valve spring 5 of the socket 51 is
7 extends and the check valve body 54 closes. Then, as shown in (c), the anti-spill valve cylinder 56 of the socket 51, the anti-spill valve body 155 of the plug 52, and the two check valve bodies 54, 15
4 is pressed by the respective springs 57, 58, 157 and 158, as shown in FIG.
And are separated.

In this case, in the separation process of switching the socket 51 and the plug 52 from the connected state to the separated state, the anti-spill valve cylinder 5
The total working lift L (see FIGS. C and f) to the front end side JA by the anti-spill valve cylinder spring 58 of 6 is the check valve body 54.1.
54 and the suction-return lift N (see FIG. 3d) more than the minimum lift M (see FIG. D) for closing all valves of the anti-spill valve cylinder 56, which is the minimum required to finish closing all of the anti-spill valve bodies 55 and 155. (Refer)) is set to a large value. Therefore, during the period from the state shown in FIG. 3D to the state shown in FIG. 3C, the anti-spill valve cylinder chamber 6 is moved by the advance of the anti-spill valve cylinder 56 to the front end side JA.
3 and the pressure in the anti-spill valve chamber 163 are reduced to negative pressure. As a result, when switching from the state shown in (c) to the state shown in (b), the working oil accumulated in the inner peripheral space of the sealing means 84 is prevented from spilling.
Suck back into 3 and do not squeeze even a very small amount of hydraulic oil.

In addition, in the above-described embodiment, the working oil is used as the usage state of the flow path joint 26, but this may be another kind of liquid or gas. Further, the cleaning fluid F is replaced with compressed air,
It is also possible to use other gases or liquids.

Further, the flow path joint of the present invention can be applied to a coupling type in which a check valve and a spill stop valve are omitted.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention. FIG. 1 is a vertical cross-sectional view showing a separated state of the flow path joint. FIG. 2 is an overall system diagram of the hydraulic clamp device. FIG. 3 is a plan view of the pressure oil supply / discharge coupling means. FIG. 4 is an elevational view of the coupling means. FIG. 5 is a sectional view taken along the line VV of FIG. FIG. 6 is an enlarged view of an essential part showing a connection start state of the flow path joint. FIG. 7 is a diagram for explaining the operation of the flow path joint, where (a) is a diagram showing a separated state, (b) to (e) are diagrams showing a connection transient state, (f)
The figure is a diagram showing a connected state. 8 and 9 show a conventional example, FIG. 8 is a vertical sectional view showing a separated state of the flow channel joint, and FIG. 9 is a vertical sectional view showing a connected state of the flow channel joint. 26 ... Flow path joint, 51 ... Socket, 52 ... Plug, 53
... socket main body, 60 ... socket side flow path, 61 ... plug receiving port, 61a ... rear end surface, 61b ... inner peripheral surface, 85 ... jet port, 89 ... sealing contact part, 153 ... plug main body, 16
0 ... Plug-side flow path, 161 ... Connection insertion portion, 161a ...
Tip surface, 161b ... Outer peripheral surface, 189 ... Sealing contact portion, C
… Cleaning outlet, F… Cleaning fluid.

Claims (1)

[Scope of utility model registration request] 1. A flow channel joint (26) comprises a socket (51) and a plug (52), and a connection insertion portion (161) is formed at a distal end side portion of a plug body (153) of the plug (52). The connection insert (16
The plug-side flow path (160) is opened in the tip end surface (161a) of 1), and an annular sealing abutment portion (189) is provided on the outer surface of the connection insertion portion (161), and the socket (51) A plug receiving port (61) is formed in a recessed portion on the front end side of the socket body (53), and a socket side flow channel (60) is formed on the back end face (61a) of the plug receiving port (61).
And an annular sealing abutment portion (89) is provided on the inner surface of the plug receiving opening (61), and at least a plurality of positions in the circumferential direction of the inner peripheral surface (61b) of the plug receiving opening (61). When the cleaning fluid (F) has the ejection port (85) opened and the socket (51) and the plug (52) are being connected, the cleaning fluid (F) ejected from the ejection port (85) is discharged. ) To the tip surface (161) of the insertion portion (161) for connection.
a) and the outer peripheral surface (161b) are sprayed to clean them, and in the state where the socket (51) and the plug (52) are connected, both sealing contact parts (89), (189) ) Abut each other, and the plug receiving port (61) and the connecting insertion part (161)
In a fluid blow type cleaning device for a flow path joint configured to seal between the mating surfaces with and, the sealing abutment portion (89) of the socket (51) is attached to the rear end surface of the plug receiving opening (61) ( 61a),
A sealing contact portion (189) of the plug (52) is provided on the tip end surface (161a) of the connection insertion portion (161), and the ejection port (85) of the cleaning fluid (F) is connected to the plug receiving port (61). ) Is opened in the inner peripheral surface (61b) of the inner peripheral surface (61b), and the axis of the jet outlet (85) is connected to the plug receiving port (6).
1) In the process of connecting the socket (51) and the plug (52) by orienting so that the cleaning fluid (F) is sprayed onto the inner end face (61a) of 1) and the sealing contact portion (89). In this state, the cleaning outflow passage (C) for the cleaning fluid (F) is formed over the entire length between the fitting peripheral surfaces of the plug receiving opening (61) and the connecting insertion portion (161). The fluid blow type cleaning device for the characteristic flow path joint.