JPH0124471Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Present Invention> The present invention relates to a self-sealing coupling for machine tools.

The present invention is equipped with a pressure fluid type clamp for attaching a workpiece or a workpiece mounting frame, for example, to a base plate built into a machine tool such as a machining center or a numerically controlled machine tool, or a base plate that is taken in and out of the machine tool. Applicable to self-sealing couplings for supplying and discharging pressure fluid to base plates, etc.

In this specification, supply and discharge of pressure fluid refers to cases where the coupling used therein is used for a single function of supplying or discharging pressure fluid, and when it is used for a complex function including both of these functions. It is used in a meaning that includes cases where

<Prior art and its drawbacks> Conventionally, as a method for supplying and discharging pressure fluid to a clamp, etc. attached to a base plate, a self-sealing method for supplying and discharging pressure fluid to a base plate equipped with a pressure fluid type clamp has been used. The steps include fixing one of the female and male plugs of the coupling ring, and moving the other from outside a predetermined area around the base plate toward one of the female and male plugs of the base plate for connection. There is a way. However, conventionally used self-sealing couplers do not allow foreign objects such as dust, chips, etc. to enter the connecting and fitting parts of both the female and male plugs, that is, the male plug receptacle of the female plug and the fitting protrusion of the male plug. This may get caught in the fitting part of the connection, or damage the fitting part of the connection, breaking the seal of the connection and causing leakage of pressure fluid at the time of connection.
Furthermore, the foreign matter may be carried away by the pressure fluid and enter the coupling ring, damaging the valve or becoming caught in the valve, causing the valve to lose its sealing performance when disconnected.
Pressure fluid may leak or clamp pressure may drop or disappear.

<Purpose of the present invention> In view of the above-mentioned circumstances, the purpose of the present invention is to use pressurized fluid to blow away foreign matter such as chips, dirt, dust, etc. that have adhered to the connecting and fitting parts of the coupling ring, and to blow them away to the connecting and fitting parts of the coupling. By eliminating the constriction of the valve, we ensure a sealed state when connecting, and furthermore, by eliminating the intrusion into the coupling, we eliminate the inability to seal the valve due to foreign matter entering from the plug side, increasing durability and reliability. purpose.

<Configuration of the present invention> The self-sealing type coupling according to the present invention is
In order to achieve the above objectives, a nozzle hole connected to a source of pressure fluid is provided inside at least one of the female and male plugs of the self-sealing coupling, the open end of the nozzle hole being connected to the other end. It is characterized in that it is formed so as not to protrude toward the plug side, and the nozzle hole is opened toward the connecting fitting portion of the other plug brought close to the one plug. Note that the connection fitting portion here refers to the portion where both the female and male plugs are fitted together for connection, i.e.
This refers to a male plug receptacle recessed at the tip of a female plug, and a fitting protrusion at the tip of the male plug that is fitted into the male plug receptacle.

<Operations and Effects of the Present Invention> The self-sealing type coupling according to the present invention constructed as described above prevents foreign matter such as chips, dust, and dirt attached to the connecting fitting portion of the other plug of the coupling from being removed from both sides of the coupling. When the plugs are approached for connection, they are blown away from the surfaces of the connecting fitting portions by pressurized fluid ejected from a nozzle formed inside one of the plugs. As a result, the connecting and fitting parts of both plugs are always cleaned and fitted together, which prevents foreign matter from getting caught in the connecting and fitting parts.
There is no risk of sealing failure of the connecting fitting part due to damage etc., and the sealing performance of the connecting fitting part during connection can be maintained at a high level over a long period of time, resulting in increased durability and reliability. It will be done. In addition, by cleaning the foreign matter, foreign matter such as facets, dirt, dust, etc. will be prevented from entering the valves built into the female and male stoppers. The valve will not be damaged or damaged by foreign objects entering through the plug, ensuring sealing performance over a long period of time when it is not connected, and improving durability and reliability. Furthermore, since foreign matter adhering to the connecting and fitting part of the other plug is removed by the pressurized fluid ejected from one of the plugs, there is no need to provide a conduit etc. on the outside of one of the plugs, and there is no need to install a nozzle inside the one plug. Since it is necessary to simply add a nozzle hole, the structure is simple, less prone to failure, and can be implemented at low cost. Moreover, the spout is located inside one of the plugs, and the opening end of the spout is formed so that it does not protrude toward the other plug, so there is no chance of damage or hindrance to handling when installing and removing both plugs. , is very useful as a self-sealing coupling for machine tools.

<Description of Embodiments> Next, a case where the self-sealing type coupling for machine tools according to the present invention is applied to a pressure oil supply/discharge device to a workpiece bullet of a machining center will be described based on the drawings.

In the following explanation, supply and discharge of pressure fluid refers to cases where the coupling used therein is used for a single function of supplying or discharging pressure fluid, and when it is used for a complex function including both of these functions. It is used in a meaning that includes cases where

Figure 1 is a plan view of the pressurized oil supply and discharge device to the clamp of a work pallet for a machining center, Figure 2 is an enlarged plan view of its main parts, Figure 3 is a vertical cross-sectional view of the female plug when it is not connected, and Figure 4 is a vertical cross-sectional view of the male plug when not connected,
FIG. 5 is a longitudinal sectional view of the coupling when connected.

In FIG. 1, numeral 1 is a machining center;
2 is a support plate for the work pallet, 3 is a base plate made of the work pallet, 4 is a turntable, 5 is a self-sealing coupling, 6 is a female plug of the coupling 5, 7 is a male plug of the coupling 5, and 8 is a forward/backward drive device. , 9 indicate hydraulic clamps provided on the upper surface of the base plate 3, respectively.

The base plate 3 is transferred between the work pallet support plate 2 of the machining center 1 and the half of the turntable 4 on the machining center 1 side, and is positioned at the pressure oil supply/discharge position shown in the figure by rotating the turntable 4 by half a turn.

Two male plugs 7 of the coupling ring 5 are attached to one side of the base plate 3 side by side.

The female plug 6 of the coupling ring 5 is arranged coaxially with the male plug 7 of the base plate 3, which is placed two side by side at the pressure oil supply/discharge position outside the area A where the base plate 3 rotates. It is connected to a piston rod 81 of a forward/backward drive device 8 consisting of a cylinder. The axis of the cylinder 82 of the advance/retreat drive device 8 is oriented parallel to the axes of the male plug 7 and the female plug 6. With this configuration, it is possible to extend the advancing/retracting drive device 8 and advance the female plug 6 toward the male plug 7 for connection.

As shown in FIG. 3, the female stopper 6 of the coupling ring 5 has an inlet/outlet valve 62 and a main valve 63 that are provided in series within a stopper case 61. The above inlet/outlet valve 6
2 is a spout valve seat 62 formed on the inner peripheral edge of the spout 61a.
a, a spout 62b that is brought into contact with and separated from the mouth valve seat 62a from the back side of the plug case 61, and this spout 62b.
a closure spring 62c that presses the valve against the spout seat 62a, and a protrusion 64 that projects from the spout 62b to the outside of the spout 61a.
and has. The main valve 63 includes an annular main valve seat 63a disposed coaxially with the spout 62b, a main valve body 63b that is moved toward and away from the main valve seat 63a from the back side of the plug case 61, and The body 63b is the main valve seat 6
It has a valve closing spring 63c that presses against the valve 3a.

A spout 62b is brought into close contact with a spout valve seat 62a.
and the main valve body 63 which is brought into closing contact with the main valve seat 63a.
A gap 65 smaller than the forward and backward stroke of the spout 62b is provided between the spout 62b and the opening 62b. As a result, when connecting with the male plug 7, by pushing the protrusion 64 against the plug spring 62c, the plug 62b is first
is received by the main valve body 63b, and furthermore, the main valve 63
The main valve body 63b is pushed away from the main valve seat 63a against the valve closing spring 63c.

The plug case 61 is pivotably supported inside a cylindrical outer envelope 67, and is provided with an annular elastic material such as rubber between the outer circumferential surface of the entrance/exit end 61b and the outer envelope 67. A body 68 is interposed. As a result, the axes of both the female and male plugs 6 and 7 can be automatically aligned when connected, and the axis of the plug case 61 of the female plug 6 and the axis of the outer enclosure 67 can be aligned automatically when disconnected. can be kept parallel or coincident.

What should be noted is that the plug case 61 has a fitting protrusion 71b of the male plug 7 that opens inside the plug port 61a and approaches the plug port 61a so that the opening end does not protrude toward the male plug 7 side. Nozzle hole 611 that opens toward
This nozzle hole 611 is connected to a compressed air source (not shown) through a gap 69 between the outer envelope 67 and the plug case 61 and a compressed air connection hole 610 formed at the base end of the outer envelope 67. This is the point. As a result, fumes are ejected from the nozzle hole 611, cleaning the fitting protrusion 71b of the approaching male plug 7, and removing foreign matter such as dust, chips, etc. from the connecting part between the female plug 6 and the male plug 7. This eliminates the possibility of being fitted with the parts stuck together.
In this way, cleaning the fitting protrusion 71b of the male plug 7 is an extremely effective cleaning method, considering that foreign matter is much more likely to adhere there than the male plug receptacle 61c of the female plug 6. It is. In addition, cleaning the connection fitting part 71b of the plug 7 attached to the base plate 3 that is taken in and out of the machine tool 1 in this way means that the machine tool 1 is exposed to a large amount of cutting chips and cutting oil droplets. Considering that the particles are scattered and fall on the base plate 3 and the stopper 7 fixed thereon, extremely effective cleaning is being carried out. Furthermore, providing the nozzle hole 611 in the stopper 6 on the side of the forward/backward drive device 8 requires less injection time than when providing the nozzle hole on the stopper 7 on the side of the base plate 3, which is frequently taken in and out of the machine tool 1. There is no need to provide a separate removable coupling for supplying pressure fluid to the hole, there is less incidental work involved in connecting and disconnecting this self-sealing pressure fluid coupling 5, and there is no need to install a separate detachable coupling for supplying pressure fluid to the hole. Even when modifying the pressure fluid supply system to a machine tool equipped with an engine to conform to the present invention, it is possible to simply replace the coupling without making any changes to the machine tool 1 or the base plate 3. benefits.

The female stopper 6 has a filter 66 covering the entire cross section of the flow path connecting the stopper 61a and the main valve 63, so that the main valve 6 can be opened from the stopper 61a side.
It is possible to more reliably prevent foreign matter from entering into.

As shown in FIG. 4, the male plug 7 of the coupling ring 5 has an inlet/outlet valve 72 and a main valve 73 that are provided in series in a plug case 71. Above inlet/outlet valve 7
2 is a spout valve seat 72 formed on the inner peripheral edge of the spout 71a.
a, a spout 72b that is brought into contact with and separated from the mouth valve seat 72a from the back side of the plug case 71, and this spout 72b.
a closure spring 72c that presses the valve against the valve seat 72a, and a protrusion 74 that projects from the plug 72b to the outside of the plug 71a.
and has. The main valve 73 includes an annular main valve seat 73a disposed coaxially with the spout 72b, a main valve body 73b that is moved toward and away from the main valve seat 73a from the back side of the plug case 71, and The body 73b is the main valve seat 7
3a and a valve closing spring 73c that presses against the valve.

The spout 72b is brought into close contact with the spout valve seat 72a.
and the main valve body 73 which is brought into closing contact with the main valve seat 73a.
A gap 75 smaller than the forward and backward stroke of the spout 72b is provided between the spout 72b and the opening 72b. Furthermore, dustproof filters 76 are interposed in the flow paths on both sides of the main valve 73 in the plug case 71 to prevent dirt and dust from flowing into the main valve 73.

In the female stopper 7 configured in this way, by pushing the protrusion 74 against the stopper spring 72c, the stopper 72b is first received by the main valve element 73b, and then the stopper 72b of the main valve 73 is pushed in against the stopper spring 72c. The main valve body 73b can be pushed away from the main valve seat 73a against this force.

Further, since the dust filter 76 prevents dirt and dust from entering the main valve 73, the operation of the main valve 73 is performed reliably over a long period of time, and the reliability of the operation of the main valve 73 is high.

The male plug receptacle 61c of the female plug 6 is connected to the double-end plugs 62b and 7.
It is formed deeper than the sum of the strokes of 2b. When connecting both the female and male plugs 6 and 7, the male plug is inserted so that the male plug 7 fits into the male plug receptacle 61c in a sealed state before the plugs 62b and 72b are butted together. A sealing member 61 is installed near the mouth of the plug socket 61c.
2 is fitted inside.

Although not shown, the injection hole 611 of the female plug 6 may be opened at the bottom surface of the male plug socket 61c. In this case, the pressure fluid ejected from the injection hole 611 cleans the inside of the male plug receiving hole 61c and then cleans the fitting protrusion 71b of the male plug 7 that is brought close thereto.

Further, as shown in FIG. 6, a nozzle hole 711 is formed around the proximal end of the fitting protrusion 71b of the male plug 7, and converges along the circumferential surface of the nozzle hole 711 toward the tip thereof. It may be configured such that the jet stream from the nozzle hole flows so as to be concentrated toward the center of the male plug socket 61c of the female plug 6 approaching.

[Brief explanation of drawings]

The drawings show an embodiment of the self-sealing pressure fluid coupling for machine tools according to the present invention. Figure 1 is a plan view of a pressure oil supply and discharge device for a clamp of a work pallet for a machining center, and Figure 2 is an enlarged view of its main parts. A plan view, FIG. 3 is a vertical cross-sectional view of the female plug when it is not connected,
FIG. 4 is a longitudinal sectional view of the male plug when it is not connected, FIG. 5 is a longitudinal sectional view of the coupling when it is connected, and FIG. 6 is a longitudinal sectional view of another embodiment of the present invention. 5...Self-sealing pressure fluid coupling,
6... Female plug, 7... Male plug, 61c, 71b... Connection fitting portion, 611, 711... Spout.

Claims (1)

[Claims for Utility Model Registration] 1. Inside at least one of the female plug 6 and male plug 7 of the self-sealing type coupling 5,
Nozzle holes 611, 711 connected to a pressure fluid source
are formed so that the opening ends of the nozzle holes 611, 711 do not protrude toward the other plugs 6, 7, and the nozzle holes 611, 711 are connected to the other plugs 6, 7 brought close to the one plug 6, 7. 7 connection fitting portion 61c, 7
A self-sealing coupling for machine tools, characterized by opening toward 1b. 2. In the self-sealing type coupling for a machine tool described in claim 1 of the utility model registration claim, the injection hole 611 is formed in the connecting fitting portion 61c of the male plug socket of the female plug 6. Seal type cup ring. 3. In the self-sealing coupling for machine tools described in claim 2 of the utility model registration, the nozzle hole 611 is formed in the inner part of the male plug socket 61c, and the pressurized fluid ejected from the nozzle hole 611 is This self-sealing type coupling for a machine tool is configured to spray onto a connecting fitting portion 71b consisting of a fitting protrusion of a male plug 7 brought close to the male plug socket 61c after cleaning the male plug receptacle 61c. 4. The self-sealing type coupling for a machine tool described in Claim 1 of the Utility Model Registration Claim, in which the nozzle hole 711 is provided in the male plug 7. 5. In the self-sealing type coupling for machine tools described in claim 4 of the utility model registration, the injection hole 711 is directed toward the connection fitting portion 71b consisting of the fitting protrusion of the male plug 7, and the connection A self-sealing type coupling for a machine tool that opens toward the center of a male plug socket 61c of a female plug 6 that is brought close to a fitting part 71b.