JPH0578380U - Electrode shank for resistance welding - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to prevent the outflow of cooling water for the electrode tip during resistance welding or when replacing the electrode tip. [Construction] A shank opening 9 is provided in the shank tip of the electrode.
A ball 11 for opening and closing is provided so as to be vertically movable via a spring 13, and a bar 13 is fixed to the lower surface of the ball 11,
The ball 11 can be moved up and down through the inner hole bottom portion 5 of the electrode tip 1 which is detachably provided at the shank tip portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shank of an electrode for electric resistance welding.

[0002]

[Prior Art]

 In electric resistance welding such as spot welding, a pair of upper and lower electrodes that face each other are used to press an object to be welded and perform welding for a predetermined time by applying an electric current, which is widely used. In this case, as shown in FIG. 3, the electrode chips 1 and 2 may be directly fixed to the electrode holders 5 and 6, or may be fixed to the electrode holders via the shanks 3 and 4. , 6 are fixed to the arms 7 and 8 for use. Further, Japanese Patent Laid-Open No. 2-20784 discloses a resistance welding device using inclined and rotating electrodes in order to significantly improve the number of continuous dots of electrodes.

The electrode of such a resistance welding apparatus has a structure in which the inside thereof is provided with an electrode holder or a shank (hereinafter referred to as a shank in the present invention) and a cooling water channel up to the tip of the electrode tip to cool the shank and the electrode tip. Has become.

[0004]

[Problems to be solved by the device]

 When removing the tip from the shank to replace the electrode tip as described above, it is necessary to close the cooling water valve to stop water from entering the cooling pipe.Therefore, replace the electrode tip in the workplace where there are many welding machines. It takes a lot of time. In addition, there is a possibility that the electrode tip may be welded to the work piece and come off during work, and in such a case, the work piece and the periphery of the welder become flooded due to the discharge of cooling water.

The present invention solves such a problem.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a ball for opening and closing the shank opening in a shank tip of the electrode so as to be vertically movable via a spring, and an inner hole of an electrode tip is provided at a tip of the ball. It provides an electrode in which a rod for vertically moving the ball is fixedly contacted through the bottom portion, and is configured so that the outflow of the cooling water is automatically stopped when the electrode tip comes off the tip of the shank. Hereinafter, the present invention will be described in detail with reference to the drawings.

[0007]

【Example】

 FIG. 1 is a partial cross-sectional view showing an embodiment of the present invention, in which a cooling water channel 16 is provided inside a shank 3, and a ball receiving portion 18 and a spring receiving portion 17 are provided at the tip of the cooling water passage 16. A room H is formed to house 21 and the spring 23. The ball receiving portion 18 also constitutes a shank opening 19.

As shown in the figure, a spring 23 is arranged in the room H, and a ball 21 having a needle-like thin rod 22 fixed to the lower surface thereof at the lower part thereof is housed in a state in which the spring 23 constantly presses the ball 21 downward. Has been done. The ball 21 is arranged so that the rod 22 extends on the central axis of the electrode D. Since the shank of the present invention is constructed as described above, when the inner hole portion 14 of the electrode tip 1 is attached to the taper portion 3-1 of the shank 3 in order to attach the electrode chip 1 to the shank 3, the inner hole is formed. The bottom portion 15 pushes the ball 21 into the room H via the rod 22. As a result, the shank opening portion 19 is opened and the cooling water from the cooling pipe 20 flows into the inner hole portion 14 of the electrode tip 1 to sufficiently cool the electrode tip 1. Spot welding is performed in such a state.

When the electrode tip 1 is replaced, or when the electrode tip falls off the shank during work, the ball 21 is immediately pressed downward by the spring 23, and the shank opening 19 is automatically sealed to cool the cooling water. Is prevented from flowing out. Thus, according to the present invention, spot welding can be performed safely and without waste of time.

[0010]

[Effect of the device]

 As described above, the present invention can prevent the outflow of cooling water in any case, so that the work can be performed safely and efficiently, and its industrial effect is great.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a shank tip portion according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which the electrode tip is removed from the shank tip portion of FIG.

FIG. 3 is a front view showing a conventional resistance welding device.

[Explanation of reference signs] 1, ... Electrode tip 3,4 ... Shank 5,6 ... Electrode holder 7, 8 ... Arm 9 ... Pressurizing shaft 14 ... Inner hole 15 ... Inner hole bottom 16 ... Cooling channel 17 ... Spring receiver Part 18 ... Ball receiving part 19 ... Shank opening part 20 ... Cooling pipe 21 ... Ball 22 ... Rod 23 ... Spring

Claims (1)

[Scope of utility model registration request] 1. A device for performing welding by pressing an object to be welded by a pair of opposed upper and lower electrodes, in which a ball 11 for opening and closing the shank opening 9 is vertically moved through a spring 13 in a shank tip of the electrode. A bar 12 for freely moving the ball 11 is fixed to the lower surface of the ball 11 via the inner hole bottom portion 5 of the electrode chip 1 which is detachably provided at the tip of the shank. Electrode shank for resistance welding.