JP2001150151A - Device for pulling-out electrode tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and quickly pull out an electrode tip without damaging the electrode tip and a shank. SOLUTION: The base of the insertion tapered column of the electrode tip of the shank, is embraced from the direction perpendicular to the shaft of the shank by two jigs embracing in a semicircular shape the electrode insertion tapered column part between the shank and an electrode, and only one of the jigs is pressed downward in the vertical direction through a wedge mechanism to pull out the electrode tip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for automatically extracting an electrode tip for resistance welding. In particular, the present invention relates to a device for automatically extracting an electrode tip of a gun mounted on a welding robot.

[0002]

2. Description of the Related Art Conventionally, there are automatic extracting devices of this kind, for example, Japanese Patent Application Laid-Open Nos. Hei 3-184673 and Hei 11-77329, all of which are configured so as to extract by twisting an electrode tip. Another conventional example is Japanese Utility Model Laid-Open No. 4-373.
Reference numeral 8 has a structure in which a cutting tool is inserted between the shank and the tip, and the cutting tool is moved upward to pull out by the leverage principle.

[0003]

However, the above-mentioned Japanese Patent Laid-Open No.
In 184673 and JP-A-11-77329, the withdrawal force of the electrode tip is the torsion force of the electrode tip, and when the force is applied to the shank as it is, there is a problem that the shank itself is withdrawn. In the case of Japanese Utility Model Unexamined Publication No. 4-3738, there are various problems that the tip insertion portion of the shank is easily damaged because the punching blade tool is forcibly opening between the shank and the tip, and there is a high possibility that the tip is damaged.

[0004]

According to the present invention, in order to solve the above-mentioned problems, in the process of extracting the electrode, a load such as a twisting force is not applied to the shank portion, and the electrode can be extracted without damaging the shank or the chip. Specifically, the base portion of the tapered cylindrical portion between the electrode tip and the shank of the electrode tip insertion taper portion of the shank is held substantially semicircularly from each other in the orthogonal direction of the shank. The jig is held by two punching jigs that move, and one of the jigs is vertically moved by being boosted by a wedge mechanism after being held, and the semicircular lower surface of the jig is inserted with the electrode tip. The present invention relates to a device for extracting an electrode tip, characterized in that the electrode tip is pulled out by pushing down a substantially semicircle at the periphery of the mouth.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be described below based on embodiments. A tapered hole of the electrode tip 4 is firmly inserted into the tip of the tapered cylinder 5 of the shank 1.
The principle of the extraction according to the present invention is that the tapered column 5 between the shank 1 and the inserted electrode tip 4 is held by the fixing jig 3 and the moving jig 2 divided into two semicircles. . By pressing the moving jig 3 in the directions indicated by arrows 8 in the above state, the moving jig 2 holds the shank 1 and at the same time pushes the shank 1 downward through the wedge mechanism. By this operation, the fixing jig 3 holds the semicircle of the shoulder 6 of the shank 1, the shoulder 6 of the moving jig 3 pushes down the semicircle of the hole edge of the electrode tip 4, and the electrode tip 4 is pulled out. A strong force is required to push down the moving jig 2 and pull out the electrode tip 4,
The moving jig 2 is operated by increasing the force of the cylinder several times by a wedge mechanism and changing the moving direction of the moving jig 2.

More specifically, the fixing jig 3 is fixed to a connecting bar 12 and further connected to two connecting shafts 18. A moving jig 2 is disposed in a U-shaped portion 20 of the body 11, and the moving jig 2 is attached to a top plate 13 by a spring 16.
It is mounted movably downward via mounting screws 15. The top plate 13 is attached to the body 11 via screws 14 so as to be movable in the backward direction. A spring 17 is disposed between the moving jig 2 and the bottom portion of the body 11 that opens in a U-shape, and the moving jig 2 is pushed out toward the tip of the body 11. The body 11 is held in an active state by two connecting shafts 18 and is connected to a piston shaft of a cylinder (not shown). Two connecting shafts 1
Reference numeral 8 is attached integrally to the cylinder body.

The U-shaped portion 20 of the body 11 is a portion forming a wedge mechanism, and is formed into a taper in two directions from the bottom to the tip and from the top to the bottom as shown in FIGS. I have. The moving jig 2 is in a state where the taper and both side surfaces are in close contact with each other. When the moving jig 2 moves backward in the U-shaped portion 20 of the body 11, the moving jig 2 moves downward. Depressed. The rate at which the moving jig 2 is pushed downward is determined by the taper angles in the above two directions. Specifically, the downward movement is set to about one tenth of the backward movement. In other words, the downward moving force forms a wedge mechanism that is boosted ten times the backward moving force.

In the above state, if the body 11 is pushed out by the piston shaft of a cylinder (not shown), the semicircular tip of the moving jig 2 first comes into contact with the tapered column 5 of the shank 1 and the moving jig 2 advances. Stop. Next, the fixing jig 3 is drawn through the connecting shaft 18 by the body 11 which is further extruded, and the semicircular tip of the fixing jig 3 has a tapered column 5.
At the same time, the semicircular tips of the jigs 2 and 3 come into contact with each other, so that the movement in the lateral direction is prevented, and the tapered column 5 of the shank 1 is moved by the moving jig 2 and the fixing jig 3. They are held by their semicircular tips.

Next, the movement jig 2 is pushed further by the movement of the body 11 to crush the springs 16 and 17 to move backward in the U-shaped portion 20 of the body 11. The U-shaped portion 20 of the body 11 is tapered in two directions, that is, a tip direction and a downward direction, to form a wedge mechanism. Therefore, the moving jig 2 is boosted by the wedge mechanism to be vertically moved. Then, the semicircular tip of the moving jig 2 pushes down the semicircular edge of the insertion hole of the electrode tip 4. At this time, the semicircular tip of the fixing jig 3 comes into contact with the base of the tapered column 5 of the shank 1 and holds the semicircle of the tapered column 5 of the shank 1, so that the electrode tip 4 is removed. To quickly remove the upper and lower electrode tips,
A small and inexpensive device can be obtained by forming two U-shaped opening portions 20 with inverted tapered directions on the body 11 and disposing two sets of punching jigs 2 and 3 with inverted top and bottom. It can be.

[0010]

As described above, according to the present invention, since no load is applied to the shank portion during the extracting operation, the electrode tip can be extracted without damaging the shank.
In addition, the upper and lower electrodes can be extracted by a set of extraction devices, and the whole can be simply manufactured in a small size.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a sampling principle of the present invention.

2 and 3 are longitudinal sectional views of the apparatus of the present invention.

FIG. 4 is a plan view of the device of the present invention.

FIG. 5 is a cross-sectional view of the device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 shank 2 moving jig 3 fixing jig 4 electrode tip 11 body 18 connecting shaft

Claims (1)

[Claims] An electrode tip insertion taper between a shank main body and an electrode tip is formed of two extraction jigs having substantially semicircular tips that hold each other in a direction perpendicular to the shank. After holding only one of the jigs, it is boosted by the wedge mechanism and moved vertically, while the other holds the shank on the semicircular top of the jig, while the jig inserts the electrode tip on the bottom of the semicircular end of the jig An electrode tip extracting device characterized in that a semicircle at the periphery of the mouth is pushed down to extract the electrode tip.