JP2823815B2 - Welding holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding holder used for spot welding and the like, to which a welding tip can be attached and detached, and to a structure for preventing leakage of cooling water for cooling the welding tip and the holder.

[0002]

2. Description of the Related Art Conventional welding tips and holders used for spot welding and the like are as shown in FIGS. As shown in FIG. 4, welding tips A are prepared in various shapes depending on the application. These include a press-contact portion B at the tip applied to a welding portion at the time of welding, a press-fit portion C pressed into a holder H, and a press-fit portion C. Are formed. The press-fitting portion C has a tapered outer periphery, and an insertion recess D into which a water pipe K of the holder H shown in FIG. Holder H
As shown in FIG. 5, a press-fit hole I for press-fitting a press-fit portion C of the welding tip A is formed in a tapered shape so that the welding tip A of FIGS. A cylindrical hole J is further formed at the back of the hole.
A water pipe K is attached coaxially to the inside. The inside of the water pipe K is communicated as a water passage P with a cooling water inlet L opened on the outer peripheral surface of the end of the holder H, and the outside of the water pipe K is a drainage path Q as an end of the holder H. The cooling water drain port M opened on the outer peripheral surface communicates with the cooling water drain port M. Then, the cooling water introduced into the cooling water introduction port L flows through the water supply passage P and flows out from the distal end opening N, and the cooling water flows through the insertion recess D of the welding tip A to cool the tip A,
This cooling water flows to the drainage channel Q and is drained from the cooling water drainage port M.

[0003]

The quick connection between the welding tip A and the holder H is realized by press-fitting means in consideration of the ease of replacement of the welding tip A and the like, and the press-fitting of the welding tip A is gentle. When using, holder H
The welding tip A may come off from the steel. in this case,
In the holder H of FIG. 5, there is a problem that the cooling water flows out from the press-fit hole I of the holder H and leaks into the work place.

[0004] It is an object of the present invention to provide a welding holder in which cooling water is automatically stopped when a welding tip falls out of the holder body so as not to leak outside.

[0005]

As shown in FIGS. 1 to 3, a welding holder according to the present invention has an insertion hole 3 for inserting and mounting a welding tip 2 in a holder body 1, and a cooling hole in the insertion hole 3. A water supply passage 4 for sending out water and a drainage passage 5 for cooling water sent out into the insertion hole 3 to return inside the holder main body 1 and to be discharged outside the main body 1 are formed.
In the welding holder, the welding tip 2 inserted into the insertion hole 3 of the holder body 1 is cooled by cooling water sent out from the water supply channel 4 and returned to the drainage channel 5, wherein the drainage channel 5 is provided by the water supply channel 4. An opening / closing valve 6 is provided on the outer periphery of the water supply passage 4 so as to be able to open and close the water supply passage 4 by sliding in the axial direction thereof. An openable / closable ring 41 is provided,
When the welding tip 2 is inserted into the insertion hole 3, the opening / closing valve 6 is opened.
Is pressed directly or indirectly by the pipe member 23 and slides to open the water supply passage 4. When the water supply passage 4 is opened, the cooling water flowing out of the water supply passage 4 passes through the welding tip 2 and goes to the drainage passage 5 side. The ring 41 slides due to the water pressure of the cooling water to open the drainage channel 5, the cooling water passes through the drainage channel 5 and is sent to the cooling water drainage port 16, and the welding tip 2 is inserted through the insertion hole 3. When the pipe member 23 is released and the opening and closing of the opening and closing valve 6 by the pipe member 23 is released, the opening and closing valve 6 slides in the opposite direction and the water supply passage 4 is closed to prevent the outflow of the cooling water. The ring 41 is released from the pressing of the ring 41, and the ring 41 slides in the opposite direction to
Is closed, and the outflow of the cooling water from the drainage channel 5 is prevented.

[0006]

In the welding holder of the present invention, when the welding tip 2 is inserted into the insertion hole 3 of the holder body 1, it is inserted into the insertion recess 36 of the welding tip 2 and the other end projects outward from the welding tip 2. The open / close valve 6 pressed directly or indirectly by the pipe member 23 is
When the welding tip 2 comes out of the insertion hole 3 of the holder main body 1, the push of the opening / closing valve 6 by the pipe member 23 is released, and the opening / closing valve 6 slides in the opposite direction and is fed. The water channel 4 is closed to prevent the outflow of the cooling water, and as a result, the pressure of the ring 41 by the water pressure of the cooling water is released, and the ring 41 slides in the opposite direction to close the drain channel 5 (FIG. 2). The outflow of the cooling water from the drain channel 5 is prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a welding holder according to the present invention will be described in detail with reference to FIG.

In FIG. 1, reference numeral 1 denotes a holder main body, which is formed of a metal material in a round bar shape. At one end in the longitudinal direction of the holder body 1, an insertion hole 3 for press-fitting the tapered press-fitting portion 30 of the welding tip 2 is formed in a tapered shape. 1 is a cylindrical round hole 11 toward the other end in the longitudinal direction.
Are formed.

In the round hole 11 of the holder body 1, a water supply passage 4 for flowing cooling water in the direction of arrow b in FIG. 1A (for flowing cooling water to the insertion hole 3) and a cooling water FIG.
A drain passage 5 for flowing in the direction of arrow a in FIG. 5A is formed separately from inside and outside. This water supply channel 4 and drainage channel 5
Is formed by four pipe members 20, 21, 22, and 23 mounted in the round hole 11 of the holder body 1, and these pipe members 20, 2 which are linearly connected are formed.
The inside of 1, 22, 23 is formed as a water passage 4 for flowing cooling water in the direction of arrow b, and the outside of the pipe members 20, 21, 22, 23 is formed as a drain passage 5 for flowing cooling water in the direction of arrow a.

The pipe member 20 is a pipe formed in a cylindrical shape. The rear end of the pipe member 20 is screwed into a female screw 17 formed on the end face 12 of the round hole 11, and is straightly protruded into the round hole 11 and fixed. The passage 18 inside the pipe member 20 is
7 through a passage 13 opened at the center of the holder body 1.
Through a cooling water inlet 15 formed on the outer peripheral surface of the cooling water. A passage 10 is also formed in a round hole 11 outside the pipe member 20, and the passage 10 is formed in the holder body 1.
Through a cooling water discharge port 16 formed on the outer peripheral surface of the cooling water. The cooling water inlet 15 and the cooling water outlet 16
Are formed with screws, and taps for connecting a hose to these screws can be screwed.

The pipe member 21 is a pipe formed in a cylindrical shape. The pipe member 21 has a rear end welded to the front end of the pipe member 20 and has a round hole 1.
1 is protruded straight and fixed. The passage 19 inside the pipe member 21 corresponds to the passage 18 of the pipe member 20.
It is communicated.

The pipe member 22 is formed in a cylindrical shape large enough to inscribe the inner surface of the round hole 11, and has four vertical grooves 24 formed on the outer peripheral surface as shown in FIG. 1 (c). ing. The rear end of the pipe member 22 is screwed with the front end of the pipe member 21, and the outer peripheral surface is tightly fixed to the inner surface of the round hole 11 and is fixed in the round hole 11. In this pipe member 22, the inner passage 25 communicates with the passage 19 of the pipe member 21, and also in the outer peripheral portion inscribed in the round hole 11, the cooling water is formed by the vertical groove 24 in FIG.
Can flow in the direction of arrow a.

An opening / closing valve 6 for opening and closing the passage 25 is provided inside the passage 25 of the pipe member 22. As shown in FIG. 3A, the on-off valve 6 has a substantially conical valve portion 27 and a slit portion 2 having a slit formed therein.
8, the valve portion 27 can move only the large diameter portion of the passage 25, and the slit portion 28
The small diameter portion of the passage 25 can be moved in accordance with the slide 7. The tapered portion connecting the large diameter portion and the small diameter portion of the passage 25 forms a valve seat 26 to which the valve portion 27 of the valve 6 can be in close contact. When the valve portion 27 comes into close contact with the valve seat 26, the passage 25 closes. It is supposed to be. When the valve portion 27 is separated from the valve seat 26, the slit portion 28 projects into a large diameter portion of the passage 25, and the passage 25 is connected through the slit.

The pipe member 23 is a pipe formed in a cylindrical shape. The pipe member 23 has a longitudinal end portion inserted into an insertion concave portion 36 formed in the press-fit portion 30 of the welding tip 2, and a central portion in the longitudinal direction formed with a screw formed inside the insertion concave portion 36. 35 and is fixed to the welding tip 2. The pipe member 23 has a rear end portion in the longitudinal direction protruding outside the welding tip 2, and this rear end can be inserted into and removed from the passage 25 of the pipe member 22 of the holder body 1.

When the press-fit portion 30 of the welding tip 2 is pressed into the insertion hole 3 of the holder body 1, the rear end of the pipe member 23 protruding from the welding tip 2 is inserted into the passage 25 of the pipe member 22. Open / close valve 6
(A) is pushed out in the direction of arrow a, thereby opening the passage 25. When the press-fitting portion 30 of the welding tip 2 comes out of the insertion hole 3 of the holder body 1, the rear end portion comes out of the passage 25 of the pipe member 22. Pressing of the opening / closing valve 6 is released, whereby the opening / closing valve 6 is returned in the direction of the arrow b by the pressure of the cooling water flowing in the passage 25, and the passage 25 is closed.

FIG. 1 shows an outer peripheral surface of a portion of the pipe member 23 which is screwed with the welding tip 2 at the center in the longitudinal direction.
As shown in (b), four vertical grooves 33 are formed.
The passage 34 inside the pipe member 23 can be connected to the passage 25 of the pipe member 22 of the holder body 1, and when this connection is made, the cooling water flowing out of the passage 25 of the pipe member 22 flows into the passage 34. It has become. When the cooling water flowing through the pipe member 23 blows out from the opening at the tip end of the pipe member 23, the cooling water flows back in the insertion recess 36 of the welding tip 2 in the direction of arrow a in FIG. Through the vertical groove 33, the insertion hole 3 of the holder body 1
Is to be returned to. The cooling water returned to the insertion hole 3 of the holder body 1
It returns to the end surface 12 of the round hole 11 along the outer circumferences (drainage channels 5) of 1 and 20.

In this embodiment, the O-ring 40 is provided inside the passage 25 of the pipe member 22 in which the pipe member 23 is inserted.
The cooling water flowing through the pipes 22 and 23 when the pipe members 22 and 23 are connected is attached to the pipe 2.
It does not leak out of 2 and 23. In addition, a ring (for example, O
Ring) 41 is disposed so as to be slidable in the axial direction of the drainage channel 5, and when the welding tip 2 comes off from the holder body 1, the drainage channel 5 between the round hole 11 and the pipe members 22, 21, 20 is formed. The cooling water left inside is prevented from leaking from the insertion hole 3.

In the welding holder described above, the pipe member 20 may have a structure as shown in FIG. This is such that two pipes 50 and 51 are inserted into both ends of a thicker pipe 52 so that the two pipes 50 and 51 can be expanded and contracted in the axial direction in a state of being inserted into the pipe 52. It was made. In this structure, since the pipe member 20 inserted in the round hole 11 of the holder body 1 can be moved back and forth in the round hole 11, for example, the welding tip 2 having a long press-fit portion 30 can be used. When the pipe member 22 is inserted into the insertion hole 3 of the holder body 1, the pipe member 22 is pushed into the inside of the round hole 11, and when the welding tip 2 having the short press-fit portion 30 is inserted into the insertion hole 3 of the holder body 1. The pipe member 22 can be pulled out in front of the round hole 11 so that even welding tips 2 having different lengths can be securely attached.

[0019]

By using the welding holder of the present invention, it is possible to produce a welding machine in which cooling water is not spouted even if the welding tip comes off the holder body.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing an embodiment of a welding holder according to the present invention, in which a welding tip is press-fitted into a holder body, and FIG. 1B is a sectional view of FIG. A-A
Sectional drawing, (c) is BB sectional drawing of (a).

FIG. 2 is a cross-sectional view showing one embodiment of the welding holder of the present invention, showing a state in which a welding tip is detached from a holder main body.

FIG. 3A is a perspective view of an opening / closing valve used in the welding holder of the present invention, and FIG. 3B is a cross-sectional view showing another example of a pipe member used in the holder.

4A to 4C are side views showing different examples of a welding tip.

FIG. 5 is a sectional view showing an example of a conventional welding holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder main body 2 Welding tip 3 Insertion hole 4 Water supply channel 5 Drainage channel 6 Open / close valve

Claims (1)

(57) [Claims] A welding tip (2) is provided on a holder body (1).
An insertion hole (3) for inserting and mounting a water supply passage (4) for sending cooling water into the insertion hole (3);
A drain passage (5) through which the cooling water sent into the insertion hole (3) returns inside the holder body (1) and is discharged outside the body (1) is formed, and the holder body (1) is inserted. In the welding holder, the welding tip (2) inserted into the hole (3) is cooled by cooling water sent out from the water supply channel (4) and returned to the drainage channel (5). ) Are provided on the outer periphery of the water supply channel (4), and an opening / closing valve (6) that can open and close the water supply channel (4) by sliding in the axial direction is provided in the water supply channel (4). )
A ring (41) that can slide in the axial direction to open and close the drainage channel (5) is provided in the inside, and when the welding tip (2) is inserted into the insertion hole (3), the opening and closing valve (6) is connected to the pipe member ( 23) Directly or indirectly pushed by and slides to open the water channel (4), and when the water channel (4) is opened, the cooling water flowing out of the water channel (4) flows through the welding tip (2). The ring (41) slides by the pressure of the cooling water to open the drainage channel (5).
The cooling water passes through the drainage channel (5) and the cooling water drainage port (1)
6) and the welding tip (2) is inserted into the insertion hole (3).
When the opening / closing valve (6) is released from the pipe member (23) and the pushing of the opening / closing valve (6) is released, the opening / closing valve (6) slides in the opposite direction, the water supply passage (4) is closed, and the outflow of the cooling water is prevented. As a result, the pressure of the ring (41) by the water pressure of the cooling water is released, and the ring (41) slides in the opposite direction to close the drainage channel (5), and the cooling water flows out of the drainage channel (5). A welding holder characterized in that the welding is prevented.