JP2802787B2 - Quick fitting for fluid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a quick coupling used for quickly connecting or disconnecting a middle part of a hydraulic pipeline in a hydraulic clamping device for fixing a work of a machine tool, for example. More specifically, a check valve and a non-return valve are respectively attached to sockets and plugs constituting both sides of the quick coupling, so that when the coupling is separated, the check valve can be used to remove liquid such as hydraulic oil. The present invention relates to a quick coupling that prevents leakage and prevents liquid from spilling by a non-spill valve.

<Conventional technology> This type of quick coupling for liquids with a double-sided check valve and non-spill valve is designed to prevent liquid from spilling out of the connection port during the separation operation of the joints, thereby preventing the product from becoming dirty with liquid. It is used to prevent the atmosphere from being polluted, and its basic structure is as follows, as shown in FIG.

As shown mainly in FIG. 7A, the joint body 53 'of the first joint 51' and the joint body 153 'of the second joint 52' are provided substantially coaxially facing each other. A non-stop valve cylinder 56 'is inserted into the non-stop valve cylinder chamber 63' provided in the main body 53 'so as to be able to advance and retreat in the axial direction in a hermetically sealed manner, and is inserted into the cylinder hole 56a' of the non-stop valve cylinder 56 '. Insert the body 55 'and fit the non-spill valve cylinder 56'
To the closed position of the distal end JA, and insert a non-stop valve body 155 'into a non-stop valve chamber 163' provided in the joint body 153 'of the second joint 52', and the non-stop valve body 155 ′ To the closed position of the distal end JB, and the end of the distal end JB of the joint body 153 ′ is attached to the non-spill valve cylinder 5.
6 'is provided, and the two joints 51' and 52 'are butt-connected to each other, so that the valve cylinder pusher 156' is connected to the non-spill valve cylinder 5.
6 'is retracted to the open position of the proximal end UA, and the non-stop valve element 55' of the first joint 51 'is connected to the non-stop valve element 155' of the second joint 52 'by the proximal end UB. And the check valve 54 'of the first joint 51' and the check valve 154 'of the second joint 52' are openable.

In the basic structure described above, the structure of the part for sealing the non-spill valve cylinder chamber 63 'and the non-spill valve chamber 163' in a state where the two joints 51 'and 52' are separated will be described in more detail. It is like.

That is, the non-stop valve bodies 55 'and 155' are configured as a seat valve type, and the first non-stop valve body 55 'is connected to the tapered non-stop valve port surface 71' by the butt connection side which is the distal end side. Close contact is made from JA to the separation side UA, which is the base end side, and the second non-stop valve body 155 'is separated from the tapered non-stop valve opening surface 171' at the base end side. Closed contact is made from the side UB to the butt connection side JB, which is the tip side.

The quick coupling 26 'for liquid having this structure operates as follows during the connection operation.

(A) shows a connection start state, in which each valve element 54 ', 55',
154 'and 155' are closed by the springs 57 ', 58', 157 'and 158', and the communication between the oil supply and discharge ports 62 'and 162' at both ends is interrupted. 51 'non-spill valve cylinder 56'
And the valve barrel pushing portion 156 'of the second joint 52' are sealed and contacted by the sealing means 84 '.

When the first joint 51 'is advanced to the right butt connection side JA with respect to the second joint 52', the following operation is performed and the state shown in FIG. First, the non-spill valve body spring 58 'is contracted, so that the non-spill valve body 55'
Are separated from each other, and the two valve bodies 55 'and 155' come into contact with each other. Next, when the non-slip valve spring 158 'is contracted, the non-slip valve body 155' is separated from the non-slip valve port surface 171 'and the rod 15
9 'contacts the check valve body 154'.

Then, as the first joint 51 'advances, the first check valve element 54' is opened as shown in FIG.
(D) As shown in the figure, the second check valve 154 'is opened, and the two oil supply / discharge ports 62' and 162 'are communicated.

On the other hand, at the time of the separating operation from the connection completed state in FIG. (D), the quick coupling 26 'operates as follows.

When the powder of the first joint 51 is pulled away from the second joint 52 'to the left side and separated to the UA side, first, as shown in FIG. 10C, the second check valve pair 154' closes, Next, as shown in FIG. 5B, the first check valve 54 'closes, and the first joint 54'
As the 51 'moves backward, it operates as follows. That is,
As the non-return valve spring 158 'and the non-return valve cylinder spring 58' expand, first, the second rod 159 'separates from the check valve 154' and the second non-return valve 1
55 'comes into contact with the non-stop valve face 171' to close the valve, and then the first non-stop valve face 71 'contacts the non-stop valve body 55', which closes. .

<< Problems to be Solved by the Invention >> The above-described conventional technology has the following problems (a) to (c).

(A) Spill-out occurs during the separation operation.

Since the quick fitting 26 'operates as described above,
At the time of separating operation of 1 'and 52', a time difference must occur in the closing timing of the non-spill valve elements 55 'and 155'.

When connecting the two joints 51 'and 52', first, it is necessary to seal the space between the non-spill valve body 56 'and the valve body pushing portion 156' with the sealing means 84 '. In order to absorb the contact error between the respective non-stop valve bodies 55 'and 155' and the respective non-stop valve port surfaces 71 'and 171', the distance between the butting surfaces of the non-stop valve bodies 55 'and 155' There is no choice but to provide a gap. In other words, immediately before the two joints 51 'and 52' are separated from each other, a gap is formed between the butting surfaces of the non-spill valve bodies 55 'and 155'.

Thus, there is a time difference in the valve closing timing,
Further, since a gap is formed between the valve bodies, a liquid pool is formed between the non-spill valve bodies 55 'and 155' immediately before separation. In addition, the amount of the liquid pool has to be further increased due to the chamfer gaps provided at the peripheral portions of the two valve bodies 55 'and 155'. As a result, spilling occurs during the separating operation.

(B) The durability of the spill prevention is low.

The seat valve type non-stop valve bodies 55 'and 155' and the non-stop valve port surfaces 71 'and 171' are easily damaged by foreign matter being caught and contaminated, and the liquid seal is easily broken. Low durability.

(C) A large connecting operation force is required.

When the two joints 51 'and 52' are separated from each other,
Since the non-stop valve bodies 55 'and 155' close while the 3 'and non-stop valve chamber 163' are in a high pressure state, a large operating force is required at the next connection operation.

The present invention solves the problems of the above items (a) to (c) to prevent spillage at the time of separating operation, increase durability of spill prevention, and reduce connection operation force. Aim.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention provides, in the above-mentioned basic structure, a part for sealing the non-spill valve cylinder chamber and the non-spill valve chamber with the two joints separated. The structure was improved as follows.

For example, as shown in FIG. 1 to FIG. 7, the tip of the cylinder hole (56a) of the above-described non-spill valve cylinder (56) and the tip of the above-mentioned non-spill valve chamber (163) are formed with a cylindrical hole. Of the first joint (51), and the non-spill valve body (155) of the second joint (52). In the state where is switched to the closed position, each of the above-mentioned non-stop valve bodies (55) and (155) can be fitted into the above-mentioned non-stop valve opening faces (71) and (171) in a liquid-tight manner, Operating lift (L) to the tip side (JA) of the non-spill valve cylinder (56) when the two joints (51) and (52) are separated.
Is set to a value larger than the moving lift (M) at which the above-mentioned non-stop valve bodies (55) and (155) are re-inserted into the above-mentioned non-stop valve opening surfaces (71) and (171). It is.

In the above configuration, the non-spill valve face (71)
The inner peripheral surface of the cylindrical hole in 1) may be circular or square.

Further, in the first joint (51), the check valve body (54), the rod (59) and the non-return valve body (55) are formed individually or when the adjacent ones are integrally formed. And the case where the whole is integrally formed.

Similarly, at the second joint (52), the check valve element (15
4) The rod (159) and the non-spill valve (155) are formed individually, in a case where they are formed integrally with each other adjacent to each other, and in a case where they are formed integrally as a whole. Conceivable. And check valve (154) and rod (1
59) and check valve spring (157)
The non-slip valve spring (158) can be omitted by also using the non-slip valve spring (158).

In addition, as an external force for connecting and operating the two joints (51) and (52), an operation force of an actuator such as a pneumatic cylinder and an input of an operator can be considered.

<< Operation >> The present invention operates as follows, for example, as shown in FIG.

The quick coupling (26) operates as follows during the connection operation. Each valve element (5) extends from the separated state shown in FIG. 7A to the connection start state shown in FIG.
4), (55), (154), and (155) are kept closed. Subsequently, the valve bodies (54), (55), (154), and (54), (55), (54), and (f) are switched through the connection transient states shown in FIGS. The valve (155) is opened, and the liquid supply / discharge ports (62) and (162) communicate with each other.

On the other hand, at the time of the separating operation, it operates as follows. In the period from the connection state in FIG. (F) to the state in FIG. (D) through the state in (e), the inverted valve bodies (54) and (154) close, and the non-spill valve cylinder Chamber (63) and non-spill valve chamber (16
3) is shut off from the supply and drainage ports (62) and (162). In the state shown in the above (d), the non-spill valve cylinder (56) moves toward the distal end by the moving lift (M) with respect to the joint body (53),
Each non-slip valve body (55) (155)
1) It has begun to fit into (171). Next, in the same manner as in FIGS. (D) to (c) of FIG.
In contrast to 3), the non-spill valve cylinder (56) moves forward to the front end (JA) by a suction lift (N) which is a value obtained by subtracting the moving lift (M) from the operating lift (L). To go. Along with this, the volume of the liquid phase portion of the non-spill valve chamber (63) increases, and the non-spill valve cylinders (56) communicating with each other.
The internal pressure of the cylindrical hole (56a) and the non-spill valve chamber (163) is reduced to a state close to a negative pressure. Thereby, the contact gap between the two non-spill valve elements (55) and (155) and the sealing means (84)
The liquid accumulated in the inner peripheral space of the non-spill valve chamber (1) and the non-spill valve chamber (1
63), and in this state, the non-spill valve (55)
In (155), both chambers (63) and (163) are sealed. Therefore,
A small amount of liquid is not eliminated during the separation from (c) to (b).

Further, the non-spill valve bodies (55) and (155) and the non-spill valve opening surfaces (71) and (171) are simply fitted together to prevent the non-spill valve cylinder chamber (63) and the non-spill valve chamber (163). Can be liquid-sealed, unlike a conventional seat valve type, there is no damage due to foreign matter being jammed or the like, and the durability of non-spilling is increased.

Further, when the two joints (51) and (52) are separated from each other, the pressure in the non-spill valve cylinder chamber (63) and the non-spill valve chamber (163) is reduced to a substantially atmospheric pressure state. The operating force for the connection operation is small.

<< Effects of the Invention >> The present invention has the following effects because it is configured and operates as described above.

(A) Spillover during separation operation can be prevented.

At the end of the separation operation of the two joints, as the non-stop valve barrel advances toward the connecting side by the suction lift with respect to the joint body of the first joint, the cylinder holes of the non-stop valve cylinders communicating with each other and By reducing the internal pressure of the non-spill valve chamber to a state close to the negative pressure, the liquid accumulated in the contact gap between the two non-skid valve bodies, the inner peripheral space of the sealing means, and the like is prevented. The liquid is sucked back into the chamber and the non-spill valve chamber, and both chambers are liquid-sealed in this state, so that a small amount of hydraulic oil can be prevented from spilling.

(B) The spill prevention has high durability.

Since the non-stop valve body and the non-stop valve chamber are liquid-sealed by fitting the non-stop valve body and the non-stop valve opening face, damage due to foreign matter jamming and the like is eliminated, and the durability of the non-stop valve is high.

(C) The connecting operation force is small.

When the two joints are separated from each other, the pressure in the non-return valve cylinder chamber and the non-return valve chamber is reduced to substantially the atmospheric pressure, so that the operation force at the next connection operation can be reduced.

<< Example >> Hereinafter, an example of the present invention will be described with reference to the drawings.

(First Embodiment) FIGS. 1 to 7 show a first embodiment.

Of these figures, FIG. 2 shows the overall system diagram. This is the work pallet 1 for machining center
Is a device for supplying / discharging pressure oil to / from a hydraulic clamp 2 provided through a pressure oil supply / discharge means 4 via a pressure oil supply / discharge coupling means 3.

A work W and a plurality of hydraulic clamps 2 are placed on the upper surface of the work pallet 1. 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 the 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. At the same time, the pressure oil is discharged from the unclamping drive oil chamber 9 formed on the right side of the piston 7. Then, the piston 7 and the piston rod 10 advance rightward, and the clamp arm 11 is switched to the clamp state shown by the broken line via the piston rod 10. The work pallet 1 is separated from the pressurized 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 denotes a clamp state holding spring.

On the other hand, when the workpiece W is unclamped, the work pallet 1 and the pressurized oil supply / discharge means 4 are connected to the coupling means 3.
To supply the pressure oil to the unclamping drive oil chamber 9 and discharge the pressure oil from the clamp drive oil chamber 8.
Then, the piston 7 and the piston rod 10 retreat to the left against the clamp state holding spring 12, and accompanying the retreat movement of the piston rod 10, the clamp arm 11 is switched to the unclamped state shown in the solid line diagram.

The work pallet 1 is provided with a reserve cylinder 13 for holding a clamp pressure and a balancing cylinder 14.

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

Next, the coupling means 3 will be described. The coupling means 3 has two quick couplings, a quick coupling 26 for clamping drive and a rapid coupling 27 for driving unclamping. It is composed of a quick coupling for liquid with a check valve on both sides and a non-return valve. Quick coupling for clamp drive 26
Thus, 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 are connected or disconnected. In addition, the hydraulic clamp 2
The unclamping drive oil chamber 9 and the unclamping drive oil passage 19 of the pressure oil supply / discharge means 4 are connected or separated. Hereinafter, the structure and operation of the coupling means 3 will be described with reference to the system diagram of FIG. 2, the plan view of FIG. 3, and the elevation view of FIG.

A 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 thereof and is positioned and fixed. Pneumatic cylinder
A forward pneumatic drive chamber 32 is formed on the left side of the piston 31 of the piston 30, and a retreat pneumatic drive chamber 33 is formed on the right side of the piston 31.
Sockets 51, which are one joint (first joint) constituting each of the quick couplings 26, 27, are fixed to the tip of a piston rod 34 projecting rightward from the piston 31 via a mounting bracket 35. Correspondingly, plugs 52, which are the other joints (second joints) constituting the quick couplings 26, 27, are fixed to the left part of the work pallet 1. On the upper side of the pneumatic cylinder 30, a forward detection limit switch 37 and a reverse detection limit switch 38 are fixed side by side. These limit switches 37 and 38 can be pushed in by a forward detecting operation rod 39 and a backward detecting operation rod 40 projecting leftward from the bracket 35. Furthermore, a reserve cylinder 13 fixed to the left part of the work pallet 1
A clamp pressure detecting limit switch 42 is fixed to the side of the sockets 51 corresponding to the piston rod 13a.

 The above-mentioned coupling means 3 operates as follows.

When the clamp operation switch (not shown) is turned on in the illustrated unclamped separation state, first, the pneumatic switching valve 43 is turned on.
Compressed air is supplied into the forward pneumatic drive chamber 32 through
The piston 31 and the piston rod advance rightward. At the same time, the sockets 51 move forward to the right, and the plug 52
・ Connected to 52. Then, the advance detection operating rod 39 pushes the advance detection limit switch 37 to switch the clamp drive switching valve 20 to the pressure supply position via the pilot valves 22 and 23, and to switch the unclamping drive switching valve. 21 is switched to the discharge position, and the hydraulic cylinder 6 of the hydraulic clamp 2 is extended. This expands sufficiently and the work W
Is clamped, the pressure switch 45 provided on the clamp drive oil passage 18 increases to the clamp set pressure, and
The piston rod 13a of the reserve cylinder 13 is extended, and the limit switch 42 for clamp pressure detection is pushed and operated.

Then, after a lapse of a predetermined time, the pneumatic switching valve 43 is switched, compressed air is supplied to the retreat pneumatic drive chamber 33, and the sockets 51 are retreated to the left through the piston 31 and the piston rod 34. . As a result, the hydraulic clamp 2 is separated in the clamped state. At the same time,
The reverse detection operation rod 40 is used as the reverse detection limit switch.
Press 38 to detect the separation.

In the above operation, the compressed air of the pneumatic source 16 is supplied from the pneumatic switching valve 48 for air blow between the time when the clamp operation switch (not shown) is turned on and the time when the advance detection limit switch 37 is operated. It is supplied to each socket 51. As a result, foreign matter adhering to the tips of the sockets 51 and the tips of the plugs 52 is blown, and the connection between the socket 51 and the plug 52 is performed smoothly.

On the other hand, when the hydraulic clamp 2 is switched from the above clamped state to the unclamped state, when the unclamping operation switch (not shown) is turned on, the sockets 51 and 51 and the plugs 52 Is connected, the advance detection limit switch 37 is operated, and the pressure oil is supplied to the unclamping drive oil chamber 9 of the hydraulic clamp 2 via the unclamping drive switching valve 21 and the clamp driving oil chamber The pressure oil in 8 is discharged through the clamp drive switching valve 20. As a result, the pressure switch 46 of the unclamping drive oil passage 19 detects the set pressure for unclamping, and the clamp pressure detecting limit switch 42 is released. After a lapse of a predetermined time, compressed air is supplied to the retraction pneumatic drive chamber 33 via the pneumatic switching valve 43, and the sockets 51 are retreated to the left. Thereby, the hydraulic clamp 2 is separated in the unclamped state. At the same time, the retreat detection operating rod 40 pushes the retreat detection limit switch 38 to detect that the separated state has been achieved.

In the coupling means 3 having the above configuration, the two quick couplings 26 and 27 are formed to have the same structure. Hereinafter, the specific structure will be described with reference to FIGS. 5 to 7 and FIGS. 1 and 2. Will be described. 5 is a longitudinal sectional view of the quick coupling in a separated state, FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, FIG. FIG. 1 is a schematic diagram for explaining the operation of the quick coupling.

In FIG. 5, the socket 51 will be described first. The socket 51 is separated from the butt connection side (the right side in the figure which is the distal end side) JA in the socket body 53 which is the joint body, and is separated from the socket side (the base side side). Upper left) A connection port 61, a socket side channel 60 and a oil supply / discharge port 62, which are the first joint side channel, are formed in this order toward the UA. 54, a non-spill valve element 55, a non-spill valve cylinder 56, a check valve spring 57, a non-spill valve spring 58, and a rod 59.

That is, the receiving port 61 is formed in the center of the butt connection side JA of the socket body 53, and the inner end face 61a of the receiving port 61 is recessed.
The socket-side flow path 60 is opened. In the socket side flow path 60, in order from the right to the left, a non-spill valve chamber 63, a rod chamber 64, an annular first filter chamber 65 formed outside the rod chamber 64, a check valve chamber 66, Second filter chamber 67
Is formed. A cylindrical filter 68 is mounted in the first filter chamber 65, and a disc-shaped filter 69 is mounted in the second filter chamber 67. Further, the check valve body 54 and the check valve spring 57
Is inserted. Further, the non-spill valve cylinder 56 is inserted into the non-spill valve cylinder chamber 63.

A circular non-slip valve opening surface 71 is formed at the tip of the cylinder hole 56a of the non-slip valve cylinder 56, and the non-slip valve body 55 is slidably fitted in the non-slip valve opening surface 71. The inside of the above-mentioned non-spill valve surface 71 is formed by the cylinder hole 56a of the non-spill valve cylinder 56, the rod chamber 64,
And a check valve chamber 66 via a cylindrical filter 68.

Further, the non-spill valve 55 and the check valve 54 are connected by a rod 59. The check valve 54 is pressed by the check valve spring 57 to the right butt connection side JA in the check valve chamber 66 and is brought into close contact with the check valve seat 72 of the check valve chamber 66. . Rod 59
It is divided into two parts, a front rod 73 and a rear rod 74,
A non-spill valve element 55 is integrally formed at the tip of the front rod. On the other hand, the rods 73 and 74 transmit the movement of the non-stop valve body 55 to the separation side (left side) UA by the external force to the check valve body 54 to open the check valve 54. On the other hand, the front rod 73 restricts the movement of the non-stop valve body 55 to the butt connection side (right side) JA by the locking portion 73a. Although the rod 59 is divided to facilitate the assembly of the quick joint 26, the components of the non-spill valve element 55, the front rod 73, the rear rod 74, and the check valve element 54 are combined. It is also possible to integrally form the two components as one and limit the movement of the non-return valve body 55 to the butt connection side JA with the check valve seat 72.

Further, the non-stop valve cylinder 56 is pushed to the right butt connection side JA by the non-stop valve spring 58 in the non-stop valve chamber 63, and the non-stop valve port surface 71 is closed by the non-stop valve body 55. It is configured so that When the non-spill valve element 55 is in the closed state, the front and rear spaces thereof communicate with each other through a fitting gap (communication passage) 75 having a small cross-sectional area (see FIG. 7). For this reason, the non-spill valve chamber 63 is liquid-sealed by the surface tension of the hydraulic oil.

Further, a centering device 77 for butt connection with the socket 51 is provided.
Is provided.

That is, the eccentric permissible cylinder 78 is inserted into the butt connection side JA of the socket body 53 so as to be able to move in a radial direction in a sealed manner. The eccentric allowance cylinder 78 includes a connection base cylinder 79 having a connection reception port 61 formed therein.
And a guide tube 80 fitted in the guide tube 80. The guide tube 80 is held at the center position by a plurality of positioning springs 81. The non-spill valve cylinder 56 is inserted into the cylindrical hole of the guide cylinder 80 so as to be able to move in a sealed manner in the front-rear direction. In addition, a declination allowance ring 82 is externally fitted to the tip of the non-spill valve cylinder 56 so as to be able to swing freely, and a sealing ring comprising a zero ring is provided between the declination permission ring 82 and the non-slip valve cylinder 56. Means 84 are fitted. A sealing contact portion 89 is formed on the distal end surface of the sealing means 84. In the butt connection state (see FIG. 7), the valve cylinder pressing portion 156 provided on the distal end surface of the plug 52 is connected to the non-spill valve cylinder 56 via the deflection allowance ring 82.
Can be pressed to the left separation side UA.

Further, at a plurality of locations in the circumferential direction of the inner peripheral surface 61b of the connection receiving port 61, ejection ports 85 of the compressed air F which is a cleaning fluid are opened. That is, these ejection ports 85 are connected to the plug reception ports 61.
The inner peripheral surface 61b is formed on the distal end surface of the deflection angle permissible ring 82, which is a deep portion. The axial center of each ejection port 85 is oriented in a direction in which the compressed air F is blown to the rear end face 61a of the receiving port 61 and the sealing contact portion 89. Each of the above ejection ports 85
It is communicated with the air blow air supply port 87 through a plurality of communication holes 86 formed in the connection base cylinder 79. Each communication hole 86 above
The above-mentioned positioning springs 81 are respectively inserted in the inside.

Next, the plug 52 will be described. The plug 52 is separated from the butt connection side (left side in the drawing which is the distal end side) JB of the plug body 153 which is the coupling main body to the separation side (the right side in the drawing which is the base end side) UB. A plug-side flow path 160 and a oil supply / drain port 162, which are the second joint-side flow path, are formed in the plug-side flow path 160.
5. A check valve spring 157, a non-spill valve spring 158 and a rod 159 are provided.

That is, a plug-side flow path 160 is opened on the distal end surface 161a of the connection insertion portion 161 and an annular sealing contact portion 189 is formed in response to the sealing contact portion 89 of the socket 51. It is formed. Then, as shown in FIG.
In the state of connection, the two sealing contact portions 89 and 189 are in contact with each other to seal the space between the fitting surfaces of the connection receiving port 61 and the connection insertion portion 161.

The non-spill valve chamber 163 and the rod chamber
164, an annular first filter chamber 165, a check valve chamber 166, and a second filter chamber 167 are formed. A cylindrical filter 168 is mounted in the first filter chamber 165, and the non-spill valve chamber 163 is a cylindrical filter.
It communicates with the check valve chamber 166 via 168. Further, a disc-shaped filter 169 is mounted in the second filter chamber 167.

The check valve element 154 and the check valve spring 157 of the check valve chamber 166 are inserted, and the non-return valve element 155 is inserted into the non-return valve chamber 163. A circular non-slip valve port surface 171 is formed at the tip of the non-slip valve chamber 163, and the non-slip valve element 155 is slidably fitted in the non-slip valve port surface 171. A rod 159 is interposed in the rod chamber 164 between the non-spill valve 155 and the check valve 154.

The check valve body 154 is pressed by the check valve spring 157 to the left butt connection side JB in the check valve chamber 166, and is brought into close contact with the check valve seat 172 of the check valve chamber 166. . Further, the rod 159 transmits the movement of the non-return valve element 155 to the separation side (right side) UB to the check valve element 154 by an external force, and opens the check valve element 154. In this case, the rod 159 is formed separately from the check valve body 154, but may be formed integrally.

On the other hand, the non-spill valve element 155 is
63, the non-return valve spring 158 is used to
B, while closing the non-slip valve opening surface 171 of the non-slipping valve chamber 163, on the other hand, the external force is pressed to the right separation side UB to open the non-slipping valve opening surface 171. It is composed. In the closed state of the non-spill valve 155,
The space before and after is a small clearance space (communication passage) 175
(See FIG. 7).
Is small, the non-spill valve chamber 16
3 is liquid sealed.

When the socket 51 and the plug 52 are connected to each other while the socket 51 and the plug 52 are connected to each other, the quick coupling 26 operates as follows, as shown in FIG.

(A) When the connection operation is started in the separated state shown in the figure, the socket 51 starts to move forward, and the sealing means 84 of the socket 51 is closed.
The sealing contact portion 89 formed on the tip surface of the cleaning member is cleaned by blowing compressed air (cleaning fluid) F.

In the state where the socket 51 and the plug 52 are in the process of being fitted, as shown in FIG. 9B, over the entire length between the fitting peripheral surfaces of the connection receiving port 61 and the connection insertion portion 161, 9 Compressed air F
Is formed. As a result, the spout 85
The compressed air F blown out from the connector 161 is blown to the distal end surface 161a and the outer peripheral surface 161b of the connection insertion portion 161.
Subsequently, as shown in FIG. 9C, the sealing means 84 seals the space between the fitting surfaces of the connection receiving port 61 and the connection insertion portion 161.

Next, as shown in FIG. 6D, the non-spill valve cylinder 56 is pushed into the left separation separation side UA by the valve cylinder pushing portion 156 of the plug 52. As a result, both rods 59 and 159 come into contact with each other, and the rod 159 compresses the non-return valve spring 158 and comes into contact with the check valve body 154.

Further, when the two non-spill valve elements 55 and 155 abut each other, are separated from each other and are pushed into the separation side UA and UB, the following operation is performed.

First, as shown in FIG.
54 compresses the check valve spring 57 to open the valve. Then plug
The check valve body 154 of 52 compresses the check valve spring 157 and starts to open the valve.
Starts valve opening.

Then, as shown in FIG. 7 (f), all the valves 54, 55,.
154 and 155 are fully opened and the connection is completed.

At the time of the connection operation of the quick joint 26, the two joints 51
When the axes of 52 are inclined, the aligning device 77 shown in FIG. 5, FIG. 6, or FIG. 7 operates as follows, and the connection operation is performed smoothly.

That is, when the connection is started, the plug pushing part of the plug 52
156 spills the eccentric permissible ring 82 of the socket 51 to the valve cylinder 56
Around the axis of the plug 52 and the eccentric ring
Align with 28 axes. Next, this declination tolerance ring
82 moves the eccentric allowance cylinder 78 eccentrically through the non-stop valve barrel 56, and also separates the non-stop valve barrel 56 within the eccentric allowance cylinder 78 and retreats to the separation side UA. Accordingly, the connection between the valve body pushing portion 156 of the plug 52 and the joint body 53 of the socket 51 is eliminated, and the connection operation is performed smoothly.

On the other hand, in FIG. 1, when the socket 51 and the plug 52 are separated from each other by separating them from the connection state shown in FIG.

When the socket 51 is pulled away to the left and separated to the UA side, the check valve spring 157 of the plug 52 expands, and first, as shown in FIG. At the same time, the check valve 154 closes. Then
(D) As shown in the figure, the check valve spring 57 of the socket 51 is extended, and the check valve element 54 is closed. Then, as shown in FIG. 3C, the non-spill valve cylinder 56 of the socket 51, the non-spill valve element 155 of the plug 52 and the two check valves 54 and 154 are connected to the springs 57, 58 and 15 respectively.
In the state where it is pressed at 7.158, the socket 51 and the plug 52 are separated as shown in FIG.

In this case, in the separation process of switching the connection state in which the socket 51 and the plug 52 are butt-connected to each other to be separated and separated from each other, the non-stop valve cylinder 56 is entirely connected to the butt connection side JA by the non-stop valve spring 58. The operating lift L (see FIGS. C and f) is a moving lift of the non-return valve cylinder 56 which is the minimum necessary for the check valves 54 and 154 and the non-return valve elements 55 and 155 to be completely closed. It is set to a value larger than the minimum valve closing valve lift M (see FIG. D) by the suction / return lift N (see FIG. D). Accordingly, during the period from the state shown in FIG. 4D to the state shown in FIG. 4C, the non-stop valve barrel 56 advances into the butt connection side JA, so that the inside of the cylinder hole 56a of the non-stop valve cylinder 56 and the The pressure in the stop valve chamber 163 is reduced to a negative pressure. As a result, when switching from the state shown in FIG. (C) to the state shown in FIG. (B), the hydraulic oil accumulated in the inner peripheral space of the sealing means 84 is subjected to the non-spill valve chamber 63 and the non-spill valve chamber 163. It sucks back in and does not spill even a very small amount of hydraulic oil.

The space between the non-return valve chamber 63 and the non-return valve chamber 66, and the non-return valve chamber 163 and the non-return valve chamber 166, which are spaces communicating with the outside when the two joints 51 and 52 are separated and separated. As shown in FIG. 5, since the cylindrical filters 68 and 168 having a large filtration capacity are mounted, unlike a disc-shaped filter, the frequency of replacing the filter is low and the maintenance is not troublesome.

In the above-described embodiment, each of the cylindrical holes of the non-slip valve opening surfaces 71 and 171 is formed to be circular.However, the non-slip valve bodies 55 and 155 having a square cross section are formed in a square shape. It may be.

In addition, each communication passage for communicating the space before and after the non-stop valve bodies 55 and 155 are closed is a small-diameter hole penetrated through the non-stop valve bodies 55 and 155 instead of the fitting gaps 75 and 175. You may.

In the plug 52, the check valve spring 157 and the non-return valve spring 158 are separately provided. However, the non-return valve spring is omitted by using the non-return valve spring also as the non-return valve spring. It is also possible.

Further, in the above-described quick coupling 26, the pneumatic cylinder 30 is used as an external force to be connected and disconnected, but the connection and disconnection may be performed by an input operation. Also,
The fluid used may be another liquid instead of the hydraulic oil.

FIG. 8 to FIG. 10 show different embodiments, and a configuration different from the first embodiment will be described. Elements having the same functions as those in the first embodiment are given the same reference numerals in principle.

(Second Embodiment) FIG. 8 shows a second embodiment.

Socket 51 as a first joint and plug as a second joint
Each of the 52 check valves 254 and 354 is configured in a mushroom shape. The guide portions 291 and 391 of the check valves 254 and 354 are fitted into the socket body 53 and the plug body 153, respectively. Each guide part 2
Oil passage grooves 292 and 392 are formed in the peripheral surfaces of 91 and 391. In this way, by forming the check valve bodies 254 and 354 in a mushroom shape, the check valve bodies 254 and 354 in the check valve chambers 266 and 366 are formed.
Since a wide flow path can be ensured in the outer peripheral portion, the flow resistance of the quick joint can be small.

Further, in the plug 52, the left end surface of the non-spill valve body 355 protrudes outward from the left end surface of the valve cylinder pushing portion 356. This allows the plug body to be
Since the forward stroke of the non-stop valve body 355 to the left with respect to 153 is increased, the non-stop function is further improved. In addition, at the time of fluid pressure blowing when the quick coupling is connected, since the non-slip valve body 355 protrudes outward, blowing at the tip end surface is sufficiently performed.

Further, in the plug 52 of the above, the outer peripheral surface of the leftward portion of the rod 359 is fitted to the connection insertion portion 361 of the plug main body 153 so as to be guided and slidable. A plurality of communication grooves 394 extending in the axial direction of the rod are formed in the fitting outer peripheral surface of the rod 359. Accordingly, the rod 359 is smoothly guided, and the spilling of the non-spill valve body 355 can be prevented.

The left shoulder portion 359a of the rod 359 is in contact with the valve cylinder pushing portion 356.By setting the finishing accuracy of each contact portion to be coarse, the left and right sides of the contact portion are interposed by concave portions of surface roughness. Communication.

Third Embodiment FIG. 9 is a vertical sectional view of a socket 51, showing a third embodiment.

In this case, one rod 459 is formed. Thus, the dimension of the rod 459 in the longitudinal direction is different from that obtained by assembling a plurality of rods in the longitudinal direction, and a cumulative error of the dimension can be eliminated, so that the dimensional accuracy can be easily improved. Moreover, since the rod 459 is a single rod,
The production cost is low.

Further, a cylindrical filter 469 is mounted in an annular filter chamber 467 formed from the check valve chamber 466 to the supply / drainage port 462. As a result, the filtration capacity of the filter can be increased, so that maintenance of the socket 51 can be easily performed.

Fourth Embodiment FIG. 10 is a longitudinal sectional view of a plug 52, showing a fourth embodiment. This is obtained by changing the plug shown in FIG. 8 as follows.

That is, the cylindrical filter 569 is mounted in the annular filter chamber 567 formed from the check valve chamber 566 to the supply / drainage port 562. As a result, the filtration capacity of the filter can be increased, and maintenance of the plug 52 becomes easy.

In each of the above embodiments, the first joint is formed by the socket and the second joint is formed by the plug. However, in order to provide the non-spill function, the first joint is formed by the plug and the second joint is formed by the socket. It is also possible to configure with.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 10 show an embodiment of the present invention. 1 to 7 show the first embodiment. 1A and 1B are explanatory diagrams of the operation of the quick coupling. FIG. 1A is a diagram showing a disconnected state, FIGS. 1B to 1E are diagrams showing a transitional connection state, and FIG. 1F is a diagram showing a connected state. It is. FIG. 2 is an overall system diagram of the hydraulic clamping 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 longitudinal sectional view showing a separated state of the quick coupling. FIG. 6 is a sectional view taken along line VI-VI of FIG. FIG. 7 is an enlarged view of a main part showing a connection state of the quick coupling. FIG. 8 shows the second embodiment and is a view corresponding to FIG. FIG. 9 shows a third embodiment and is a longitudinal sectional view of a socket (first joint). FIG. 10 shows a fourth embodiment, and is a longitudinal sectional view of a plug (second joint). FIGS. 11 (a) and 11 (b) are explanatory views of the operation of the conventional quick coupling, in which FIG. 11 (a) shows a connection start state, FIGS. 11 (b) and 11 (c) show a connection transition state, and FIG. It is a figure showing a connection completion state. 51 first joint, 52 second joint, 53 joint body, 54
…… Check valve element, 55 …… Non-stop valve element, 56 …… Non-stop valve cylinder, 56a …… Cylinder hole, 57 …… Check valve spring, 58 …… Non-stop valve cylinder spring, 59 …… Rod , 63… Non-spill valve chamber, 65… Filter chamber, 66… Check valve chamber, 68
…… Cylindrical filter, 71… Non-slip valve port face, 72 …… Check valve seat, 75 …… Communication passage, 77 …… Alignment device, 78 …… Eccentric allowance cylinder, 82 …… Eccentric angle allowance ring , 84 ... sealing means, 153 ...
Fitting body, 154 ... Check valve, 155 ... Non-stop valve, 15
6 …… Cylinder pushing part, 157 …… Check valve spring, 158 …… Non-stop valve spring, 159 …… Rod, 163 …… Non-stop valve chamber, 165…
… Filter chamber, 166… Check valve chamber, 168… Cylindrical filter, 171… Non-return valve port face, 172 …… Check valve seat, 175…
… Communication passage, JA / JB …… But connection side, UA / UB …… Separation separation side, L …… All operating lifts, M …… Minimum lift for closing all valves, N …… Suction lift.

Claims (6)

(57) [Claims] A joint body (53) of a first joint (51) and a joint body (153) of a second joint (52) are provided so as to face each other substantially coaxially. A non-stop valve cylinder (56) is inserted into the non-stop valve cylinder chamber (63) provided in the joint main body (53) in a hermetically sealed manner so as to be able to advance and retreat in the axial direction. 56a) is inserted into the non-return valve body (55) to urge the non-return valve cylinder (56) to the closed position on the distal end side (JA). The non-stop valve body (155) is inserted into the non-stop valve chamber (163) provided in the 153), and the non-stop valve body (155) is urged to the closed position on the distal end side (JB), and the joint body is At the end of the tip side (JB) of (153),
A valve cylinder pushing portion (156) facing the non-spill valve cylinder (56).
By connecting the two joints (51) and (52) by butt connection, the valve cylinder pusher (156) moves the non-spill valve cylinder (56) to the open position on the base end side (UA). The non-return valve body (55) of the first joint (51) presses the non-return valve body (155) of the second joint (52) to the open position on the base end side (UB) by retracting. And a check valve body (54) of the first joint (51) and a check valve body (154) of the second joint (52) same as the above. The tip of the cylinder hole (56a) of the non-spill valve cylinder (56) and the tip of the non-spill valve chamber (163) are provided with a non-slip valve opening surface (71) (171). In the state where the non-spill valve body (56) of the first joint (51) and the non-spill valve element (155) of the second joint (52) are switched to the closed position, Each non-spill valve opening face (71 Each of the non-spill valve bodies (55) and (155) is configured so as to be fitted in a liquid-tight manner into the (171), and the non-spill valve cylinder ( Working lift (L) to the tip side (JA) of 56)
Is set to a value larger than the moving lift (M) at which the above non-stop valve bodies (55) and (155) are re-inserted into the above-mentioned non-stop valve opening faces (71) and (171). A quick fitting for liquids, characterized in that: 2. An aligning device (77) for butt connection is provided on the first joint (51), and the aligning device (77) is connected to the eccentric allowance cylinder (78) and the non-spill valve cylinder ( 56) and an eccentric allowance ring (82), and the eccentric allowance cylinder (78) is eccentric with respect to the butting direction in the distal end portion of the joint body (53) of the first joint (51). The non-slip valve cylinder (56) is inserted in the cylinder hole of the eccentric allowance cylinder (78) so as to be capable of sealing and moving in the butting direction. The above-mentioned deflection angle permissible ring (82) is externally fitted to the tip portion so as to swing freely, and sealing means (84) is provided on the tip surface of the non-spill valve cylinder (56). In a connection operation state in which the joint (51) and the second joint (52) are connected to each other by abutting each other, the valve cylinder pushing portion (156) is connected to the sealing means ( The liquid quick coupling according to claim 1, wherein the non-spill valve cylinder (56) is configured to be able to be pressed toward a proximal end side (UA) via the deflection angle allowable ring (82). 3. A filter chamber (65) between the non-spill valve chamber (63) of the first joint (51) and the check valve chamber (66) of the check valve body (54). ) And a filter chamber (165) from the non-spill valve chamber (163) of the second joint (52) to the check valve chamber (166) of the check valve body (154). ), And the above-described filter chambers (65) and (165) are formed in a ring shape in a cross-sectional view.
8) The quick coupling for liquid according to claim 1, wherein each of the couplings is provided with (168). 4. A base end (U) of the joint body (53) (153).
A) Supply and drain ports (462) and (562) are provided on the side of (UB), respectively, and the check valve chamber (466) of the first joint (51) is connected to the supply and drain port (462). An annular filter chamber (46
7) and an annular filter chamber (567) between the check valve chamber (566) of the second joint (52) and the supply / drain port (562). The quick coupling for liquid according to claim 1 or 3, wherein a cylindrical filter (469) (569) is mounted in each of the annular filter chambers (467) and (567). 5. The non-spill valve element (35) of the second joint (52).
The liquid for use according to any one of claims 1 to 3, wherein a front end (JB) end surface of (5) protrudes outward beyond a front end (JB) end surface of the valve cylinder pushing portion (356). Quick fitting. 6. The non-spill valve element (35) of the second joint (52).
The outer peripheral surface of at least the distal end (JB) of both sides of the rod (359) connected to 5) is guided and slidably fitted to the joint body (153), and the rod (359) is fitted. The rapid joint for liquid according to any one of claims 1, 3, 4, and 5, wherein a communication groove (394) extending in the direction of the rod axis is formed in the outer peripheral surface.