JPH0623820Y2 - Fluid joint device for tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is provided to supply a fluid such as air or water from a tool holder attached to a robot or the like to a tool such as a welding gun detachably attached thereto. Fluid joint device for a tool to be used.

(Prior Art) Conventionally, a fluid joint device of this type is provided with a joint main body having a fluid passage inside each of a tool holder and a mounting base of a tool which is detachably attached to the tool holder, and the tool mounting base is mounted on the tool holder. When mounting, both joint bodies are arranged so as to face each other on the same axis, and the fluid passages in both joint bodies communicate with each other. In this case, the ends of both joint bodies are sealed to seal between the joint bodies. They are fitted together, or as seen in Japanese Utility Model Publication No. 63-31835, a tip of the coupler is inserted into one joint body by inserting a tubular coupler that is biased toward the other joint body side by a spring. In addition, a ring-shaped seal member that comes into contact with the end surface of the other joint body is attached.

When using the above-mentioned joint device, it is necessary to stop the fluid supply so that the fluid does not flow out from the joint body when the tool is removed, which requires valve control and the control system becomes complicated. Also, the fluid in the flow path from the valve to the joint body may flow out and pollute the floor surface.

Also, according to Japanese Utility Model Laid-Open No. 58-19186, check valves are provided on one joint body and the other joint body respectively, and both check valves are automatically opened / closed when a tool is attached / detached. There is also known a fluid joint device which communicates with each other and closes the communication port of each joint body when the tool is removed.

According to this, although the above-mentioned inconvenience does not occur, in this one, one joint main body is fitted in the other joint main body, and an O-ring slidably contacting the outer peripheral surface of the one joint main body is mounted in the other joint main body. Then, the sealability between both joint bodies is ensured, so that the relative movement of one joint body during the attachment / detachment of the tool causes the O-ring to be rubbed and worn to lower the durability.
The problem occurs.

In this case, by applying the sealing technology of Japanese Utility Model Publication No. 63-31835 mentioned above, a ring-shaped seal that abuts on the end surface of the other joint body with the check valve mounted at the tip of the one joint body with the check valve mounted therein. If the members are attached and configured to ensure the sealing performance between both joint main bodies, the seal member will not be rubbed by the other joint main body even when the relative movement of the other joint main body when the tool is attached or detached, and durability is improved. improves.

(Problems to be solved by the invention) However, when the seal member as described above is provided, it is necessary to dispose the communication ports of both joint bodies in the axial direction at a distance.
When the tool is used, the space surrounded by the seal member is filled with the fluid, and when the check valve is closed by removing the tool, the fluid in the space is pushed by the movement of the check valve, and the tip of the seal member is pushed. This causes a problem that the fluid is scattered to the outside.

In view of the above points, the present invention is a fluid joint device having a function of automatically opening and closing a fluid passage when a tool is attached and detached, and it is possible to improve durability of a seal and prevent fluid from splashing outside. Its purpose is to provide things.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a tool holder and a mounting body of a tool which is detachably attached to the tool holder with joint bodies having fluid passages formed therein. A fluid joint device in which both joint bodies are opposed to each other on the same axis and fluid passages in the joint bodies communicate with each other when a mounting base of a tool is mounted. A check valve, which is biased in the axial direction by a spring so as to close the communication port of each joint body with respect to the other joint body, is provided, and at least one of the two check valves is provided with an operating rod extending toward the other check valve. When the mounting base of the tool is attached to the tool holder, both check valves are pushed open through the operating rod. A cylindrical coupler that is biased by a spring in the axial direction toward the other joint body is inserted into the joint body, and a ring-shaped coupler that abuts the end face of the other joint body from the axial direction at the tip of the coupler. While mounting a seal member, the inner cylinder forming the fluid passage is fixed to the one joint body while being fitted in the coupler, and a communication port for the other joint body is opened at the tip of the inner cylinder. The check valve is internally provided in the inner cylinder.

(Operation) When the tool is removed, the coupler relatively moves axially forward with respect to the inner cylinder by the urging force of the spring, and the inner volume of the space formed between the inner cylinder and the seal member attached to the coupler increases. Therefore, even if the fluid in the space is pushed by the closing operation of the check valve installed in the inner cylinder, the fluid does not scatter from the tip of the seal member to the outside.

(Embodiment) With reference to FIG. 1, (1) shows a tool holder attached to an operating end of a robot, (2) shows an attachment base attached to a tail end of a tool such as a welding gun, and A positioning pin (3) is planted in the base (2) and the pin (3) is attached to the tool holder (1).
The mounting base (2) is positioned and joined to the front plate (1a) by fitting into the positioning hole (4) formed in the front plate (1a) of the tool holder (1). Inside, a lock plate (5) having a notch (5a) at the peripheral edge of which the tip of the positioning pin (3) can be removed in the axial direction is rotatably provided, and the lock plate (5) is cut. By rotating the notch (5a) from the unlocking phase aligned with the positioning hole (4), the peripheral edge of the lock plate (5) adjacent to the notch (5a) is moved to the tip of the positioning pin (3). Engaging groove (3
The mounting base (2) is fixed to the tool holder (1) by engaging with (a), and the lock base (5) is returned to the unlock phase to return the mounting base (2) to the tool holder (1). I made it removable from 1).

Also, on the front plate (1a) of the tool holder (1) and the mounting base (2),
When the mounting base (2) is positioned on the front plate (1a) by the positioning pin (3), the cylindrical joint bodies (6) and (7) are provided in such a positional relationship that they face each other on the same axis. An inflow port (8) communicating with the first joint body (6) provided on the face plate (1a) and an outflow port communicating with the second joint body (7) provided on the mounting base (2). (9) and when the mounting base (2) is attached to the tool holder (1) as described above, the fluid passages in the joint bodies (6) and (7) communicate with each other,
A fluid such as cooling water was supplied from the inflow port (8) to the outflow port (9).

In this embodiment, the spring (10a) is attached to the first joint body (6).
The tubular coupler (1
(0) is inserted, the ring-shaped seal member (11) is attached to the tip of the coupler (10), and when the attachment base (2) is attached to the tool holder (1), the seal member (11) is 2 joint body
The inner cylinder (12) that fits inside the coupler (10) is attached to the first joint body (6) so as to be in close contact with the end surface of (7), and the tail end peripheral surface of the inner cylinder (12) is attached. Through hole (12a) that connects the inside and outside
To form a fluid passage inside the inner cylinder (12).
At the tip of (12), the communication port (1
3) is opened, and at the same time, the end face of the second joint body (7) on which the seal member (11) is seated is surrounded by the seal member (11) so that the communication port (1) for the first joint body (6) is formed.
4) is opened, and the seal member (11) is placed between the communication ports (13) and (14).
A communication passage sealed by is formed.

The inner cylinder (12) and the second joint body (7) are provided with springs (15a) (16a) so as to close the communication ports (13) (14), respectively.
Check valves (15) and (16) that are urged in the axial direction of each joint body (6) and (7) are installed inside, and both check valves (15)
(16) Each of the operating rods extends toward the other check valve.
When (15b) and (16b) are projected and the mounting base (2) is attached to the tool holder (1), the both operating rods (15b) are shown as shown in FIG.
(16b) abuts each other so that the check valves (15) and (16) are pushed open against the springs (15a) and (16a) by the abutting reaction force of the operating rods (15b) and (16b). , The mounting base (2) to the tool holder
When removed from (1), both operating rods (15b) and (16b) are separated and both check valves (15) and (16) are spring (1) as shown in FIG.
5a) (16a) is closed by the urging force to prevent the fluid from flowing out from each communication port (13) (14), and the coupler (10) to the inner cylinder (12).
Moves in the axial direction forward, and the inner cylinder (12) and the seal member
The internal volume of the space formed between (11) increases and the check valve
Even if the fluid in the space is pushed by the closing operation of (15), the fluid does not scatter from the tip of the seal member (11) to the outside.

In the figure, (15c) and (16c) are valve guides that also serve as spring supports that slidably support the check valves (15) and (16), and (17) is the tail end of the inner cylinder (12) and the second joint body ( The blind plug on the tail end of 7) is shown.

In the above embodiment, the operating rods (15b) and (16b) are projected on both check valves (15) and (16), but one operating rod having the total length of both operating rods (15b) and (16b) is used. It may be installed on the check valve.

(Effect of the Invention) As apparent from the above description, according to the present invention,
The seal member will not be rubbed by the mating joint body even when the mating joint body moves relative to each other when the tool is attached or removed, improving durability, and from the space surrounded by the seal member by closing the check valve when the tool is removed. This has the effect of eliminating the problem that the fluid is scattered to the outside.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of an embodiment of the device of the present invention, and FIG. 2 is a cross-sectional view of a main part in a state where a mounting base of a tool is separated from a tool holder. (1) …… Tool holder (2) …… Mounting base (6) (7) …… Joint body (13) (14) …… Vent (15) (16) …… Check valve (15a) (16a) ...... Spring (15b) (16b) …… Operating rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic references Sho 58-19186 (JP, U) Actual opening 58-157093 (JP, U) Actual public 59-39268 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A tool holder and a mounting base of a tool which can be attached to and detached from the tool holder are provided with joint bodies each having a fluid passage therein, and when the tool mounting base is mounted on the tool holder, both joint bodies are on the same axis. And a fluid joint device in which fluid passages in both joint bodies are communicated with each other so as to close a communication port of each joint body to the other joint body. A check valve that is biased in the axial direction by a spring is provided, and at least one of the check valves is provided with an operating rod extending toward the other check valve, and when the tool mounting base is mounted on the tool holder, In a structure in which both the check valves are pushed open via the operation rod, one joint main body is moved toward the other joint main body. A tubular coupler that is biased by a spring in the axial direction is inserted, and a ring-shaped seal member that comes into contact with the end face of the other joint body from the axial direction is attached to the tip of the coupler, and the one joint body is attached to the joint body. An inner cylinder forming the fluid passage is fixed in a state of being fitted in the coupler, a communication port for the other joint body is opened at the tip of the inner cylinder, and the check valve is installed in the inner cylinder. Fluid joint device for tools characterized by.