JPH087981Y2 - Electrode tip for resistance welding - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode tip for resistance welding, and more particularly to an electrode tip for resistance welding of a type in which a guide pin for centering and positioning a welding object is provided in an electrode tip body.

[0002]

2. Description of the Related Art The applicant of the present invention previously filed Japanese Utility Model Application No. 1-136060.
With No. 7, a guide pin is provided in the mounting hole provided in the electrode tip body so as to be movable in the axial direction, a floating valve body is movably fitted to the rod of the guide pin, and a fixed valve body is fixed to the lower part thereof. An electrode tip for resistance welding having a structure provided with a guide pin ascending air supply path for pushing up the fixed valve body and a guide pin descending air supply path for depressing the fixed valve body has been proposed.

In the resistance welding electrode tip having such a structure, the guide pin is arbitrarily selected by appropriately selecting and switching the mutual press-fitting of air into the guide pin ascending air supply path and the guide pin descending air supply path. The guide pin is lowered during pressure welding or at the time of completion of welding, and the welded product after completion of welding is moved laterally from the welding position as it is. It is possible to slide it out.

[0004]

When the resistance welding electrode tip having the above-mentioned structure is combined with the automatic welding product take-out device to automate the welding line, in order to activate the automatic welding product take-out device, It must be confirmed and detected that the guide pin in the resistance welding electrode tip is in the lowered position. An object of the present invention is to provide an electrode tip for resistance welding having a structure capable of confirming and detecting that the guide pin is in the lowered position under the above background.

[0005]

A structure of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The resistance welding electrode tip according to the present invention is an electrode tip body. Guide pin 13 in the mounting hole 11 formed in 1.
In the electrode tip for resistance welding, which is provided so as to be movable in the axial direction, a step is provided on the inner bottom peripheral surface of the mounting hole 11 to form the valve seat 4
That is, a fixed valve body 17 that can be seated on the valve seat 4 and a downwardly projecting portion 18 are integrally provided at the lower end portion of the rod 14 of the guide pin 13, and an insulating material 22 is provided at the inner bottom portion of the mounting hole 11.
The tip of the conductor 23, which is insulated from the electrode tip body 1 through the interposition, faces the tip of the conductor 23 at the lowermost position of the guide pin 13 and the fixed valve body 17 contacts the valve seat 4. The guide pin 13 is configured so as to come into contact with the tip end of the conductor 23, thereby turning on the inspection electric circuit 25 formed between the base end of the conductor 23 and an arbitrary portion of the electrode chip body 1. Check that it is at the lowest position
Weldments connected to the inspection electric circuit 25 under the known conditions
It is characterized in that the automatic take-out device is activated .

[0006]

With the above-described means, the guide pin 13 is used to perform centering and positioning of the welded article, and from the two-dot chain line in the drawing,
During the pressure welding or at the time of completion of welding, the rod 1 of the guide pin 13 is lowered to the lowest position shown by the solid line in the drawing.
The fixed valve body 17 at the lower end of the valve 4 is seated on the valve seat 4 and comes into contact therewith, and the projection 18 comes into contact with the tip of the conductor 23 which faces the inner bottom of the mounting hole 11.

As a result, the inspection electric circuit 25 connected and formed between the base end of the conductor 23 and an arbitrary portion of the electrode chip body 1 is turned on, and the appropriate detector 24 can be operated and the guide can be operated. It is possible to detect and confirm that the pin 13 is at the lowest position.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below. The electrode tip body 1 is made of a conductive material and is composed of a holder 2 and a cap 3 screwed onto the holder 2. There is. The holder 2 has a bottomed hole 5 which forms a valve seat 4 by forming a step on the peripheral surface near the inner bottom portion, and a screw 6 is engraved on the upper inner peripheral surface of the hole 5, and the cap is also formed. 3 is a stepped portion 7 in which the diameter of the upper opening is reduced.
A through hole 8 having a hole is provided, and a short cylindrical portion 10 having a screw 9 engraved on the outer peripheral surface is formed so as to project on the bottom surface side.

By screwing the screw 6 in the short tube portion 10 of the cap 3 into the screw 6 in the hole 5 of the holder 2, the holder 2 and the cap 3 are detachably coupled and integrated to form the hole 5 in the holder 2. The mounting hole 11 is formed by both the through hole 8 in the cap 3 and the end surface of the short tubular portion 10 becomes a step portion to form the valve seat 12. A guide pin 13 and a rod 14 integrated with the guide pin 13 are arranged in the mounting hole 11 so as to be movable in the axial direction.

A bulging flange portion 15 is formed at the lower end of the guide pin 13, and the flange portion 15 serves as the cap 3
The amount of protrusion of the guide pin 13 with respect to the electrode tip body 1 is regulated by being brought into contact with and locked to the step portion 7 in the through hole 8.

A floating valve body 16 is movably fitted to the rod 14 integrated with the guide pin 13, and a fixed valve body 17 made of a conductive material and a downward projecting portion 18 are integrally formed at the lower end portion. Provided on the floating valve body 16
A spacer 19 is provided for holding the fixed valve body 17 so as not to approach the fixed valve body 17 beyond a predetermined gap.

In the holder 2 which constitutes the electrode tip body 1, a supply path for supplying the guide pin raising air for pushing up the fixed valve body 17 to the bottom side in the mounting hole 11. 20 and a supply path 21 for supplying guide pin lowering air for pushing down the fixed valve body 17 into the gap between the fixed valve body 17 and the floating valve body 16 when rising in the mounting hole 11. There is.

At the inner bottom of the mounting hole 11, a conductor made of a stainless steel rod or the like is inserted laterally in an insulated state into a holder 2 constituting the chip body 1 with an insulating material 22 such as rubber interposed. An appropriate detector 24 is provided between the base end of the conductor 23 and an arbitrary portion of the electrode chip body 1 with the tip end of the conductor 23 facing the tip end.
Is connected to form an inspection electric circuit 25, and the inspection electric circuit 25 is connected and interlocked with a welding material automatic take-out device (not shown) if necessary.

In the figure, 26 is an insulating material such as rubber laid on the inner bottom surface of the mounting hole 11, 27 is a shank portion, and water, air or the like for cooling the electrode chip body 1 is provided in the hollow thereof. Are circulated.

In the above arrangement, when air is press-fitted into the mounting hole 11 from the guide pin raising air supply passage 20, the air pressure pushes the fixed valve body 17 upward, whereby the guide pin is The flange portion is raised until it is brought into contact with and locked to the step portion 7 of the cap 3 in the electrode tip body 1, and the guide pin 13 is projected onto the upper surface of the electrode tip body 1 as shown by the two-dot chain line in the drawing.

Under such a condition, when the guide pin 13 is fitted with the through hole of the welded material such as a plate material and the screw hole of the welding nut for centering and positioning, and the upper electrode (not shown) is lowered from above. The guide pin 13 is pushed down against the air pressure by the upper electrode so as not to interfere with the welding pressurization by the upper electrode, and completely presses the above-mentioned welded object to energize for welding.

During the pressure welding or at the time of completion of welding, the air supply is switched from the air supply passage 20 for the air for raising the guide pin to the air supply passage 21 for lowering the guide pin to float in the mounting hole 11. Air is pressed into the gap between the valve body 16 and the fixed valve body 17. Then, the air pressure pushes the fixed valve body 17 downward until it is pressure-bonded to the valve seat 4 while the floating valve body 16 is pressure-bonded to the valve seat 12 in the upper position, as shown by the solid line in the drawing. The guide pin 13 is lowered from the upper surface of the electrode tip body 1 so as to be completely sunk.

In this way, at the lowermost position of the guide pin 13 in which the fixed valve body 17 is pushed down and pressure-bonded to the valve seat 4, the downwardly projecting portion 18 formed integrally with the fixed valve body 17 has a mounting hole. The inner bottom of 11 comes into contact with the tip of the conductor 23.

As a result, the inspection electric circuit 25 connected and formed between the base end portion of the conductor 23 and an arbitrary portion of the electrode chip body 1 has a contact between the tip end portion of the conductor 23 and the protruding portion 18 and the fixed valve body 17. It is turned on by the contact between the valve seat 4 and the valve seat 4, and an appropriate detector 24 incorporated in the inspection electric circuit 25.
Can be operated, and it can be detected and confirmed that the guide pin 13 is at the lowest position. On the basis of this, it becomes possible to smoothly start the welded article automatic take-out device connected and interlocked with the inspection electric circuit 25 as required.

[0020]

As described above, the present invention is capable of reliably detecting and confirming that the guide pin is at the lowest position by a simple means and is not affected by the outside, magnetic resistance, oil resistance, It has excellent heat resistance, water resistance, rust resistance, etc., is extremely robust, has high reliability in detection operation, and has practical effects such as being able to manufacture and provide at low cost.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view in a partially cutaway state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode tip body 2 Holder 3 Cap 4 Valve seat 5 Hole 6 Screw 7 Step 8 Through hole 9 Screw 10 Short tube part 11 Mounting hole 12 Valve seat 13 Guide pin 14 Rod 15 Flange part 16 Floating valve body 17 Fixed valve body 18 Projection Part 19 Spacer 20 Guide pin ascending air supply path 21 Guide pin descending air supply path 22 Insulation material 23 Conductor 24 Detector 25 Inspection electrical circuit 26 Insulation material 27 Shank part

Claims (1)

[Scope of utility model registration request] 1. A mounting hole 11 formed in an electrode chip body 1.
A resistance in which a guide pin 13 is provided so as to be movable in the axial direction.
In the welding electrode tip , a step is formed on the inner peripheral surface of the mounting hole 11 to form the valve seat 4, and the rod 1 of the guide pin 13 is formed.
Fixed valve body 17 that can be seated on the valve seat 4 at the lower end of
And the downwardly projecting portion 18 are integrally provided, and the tip end of the conductor 23, which is insulated from the electrode chip body 1 by interposing the insulating material 22 on the inner bottom portion of the mounting hole 11, faces the guide pin 13. The fixed valve body 17 is at the lowest position of the valve seat 4
And the projecting portion 18 contacts the tip of the conductor 23, so that the inspection electric circuit 2 formed between the base end of the conductor 23 and an arbitrary part of the electrode chip body 1 is formed.
5 is turned on, and the guide pin 13 is at the lowest position.
In the inspection electric circuit 25 under the condition that the position is detected
To start the automatic weldment take-out device linked with the connection
The electrode tip for resistance welding characterized by the above.