JPH0452083A - Exchanging device for electrode chips - Google Patents

Abstract

PURPOSE:To automatically exchange the electrode chips in a short time by carrying out holding and pulling out of the electrodes by pressurizing these in the axial direction, mounting the electrode chips arranged at specific intervals on a disk by utilizing a pressurizing mechanism of welding equipment and exchanging the disk itself on which the electrodes are arranged to supplement the electrode chips. CONSTITUTION:An electrode chip pulling out means core 6 is fixed on a frame 16 and an arm 20, and an arm 20 is rotated with a pressurizing axis 18 as a center and pressurized at an interval with the frame 16 side and the electrode chips are pulled out by a pulling out device. The pulling out devices are set in two pairs up and down and the upper and lower chips are pulled out simultaneously. After the arm 20 is opened, the frame 16 is not rotated like an arc 25 by an main shaft 17 and the disk 22 on which the electrodes are arranged upward and downward are moved from the position of a line B to the position of a line A and the electrode chips are supplied and the pressurizing mechanism of the welding equipment is operated and the electrode chips are mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrode tip replacement device for resistance welding, and particularly to an electrode tip replacement device suitable for automatically replacing electrode tips of a welding robot.

(Prior Art) Electrode tips for resistance welding are attached by being inserted into the shank with a taper, and as they wear out, they need to be replaced from time to time.

Conventionally, when replacing a tip, an operator would use a tool to pull it out and replace it with a new tip.

(Problems to be Solved by the Invention) However, an electrode tip whose taper is firmly inserted due to pressure during welding cannot be easily removed.

It takes skill to quickly replace two such electrode tips, one on the top and one on top, in a short period of time, and the shank side is often damaged.Also, when using multiple welding robots, it is difficult for workers to reach the operating range of the robots. The danger of entering the facility and the time required to do so were issues.

(Means for Solving the Problems) The present invention removes the electrode tip by pressing the electrode tip holding member in the axial direction, and utilizes the pressure mechanism of the welding device to attach the tip. The electrode tips are supplied by arranging them at appropriate intervals on the upper and lower surfaces of the outer periphery of the disk, with their tips facing each other.
It is configured so that it is rotated intermittently, and the electrode tips are replenished by replacing the previous disk.

Further, the electrode chips are configured to be replaced alternately so that the electrode chips can be removed and installed at the same position.

(Function) In the electrode tip replacement device of the present invention configured as described above, as an electrode tip extraction means, in the process of pressing the electrode tip holding member in the axial direction via the clamp mechanism using the cylinder, twisting and axial force are applied. Attach and remove.

The electrode tip is attached by press-fitting and holding it into the taper of the shank using the pressure mechanism of the welding device.

As a means for supplying electrode tips, the tips are arranged at appropriate intervals on the upper and lower surfaces of the outer periphery of a disk, with the tip ends facing each other, and are rotated intermittently.

As a means of replenishing electrode tips, the disk itself is replaced.

(Example) The features of the present invention will be specifically explained below with reference to the drawings.

Removing the electrode tip.

Electrode tip 2 inserted into shank 1 with a taper
A shank holding member 4.4a and electrode tip holding members 5, 5a each having a wedge surface 5b at the tip thereof are arranged in a facing state around the shank holding member 4.4a.

A wedge-shaped core 6 is sandwiched between the shank holding members 4, 4a and the tip holding members 5, 5a facing each other, and the shank holding members 4, 4a are held together by two shafts 13.13a.
It is held via elastic material 14.14a.

From the distal end side of the wedge-shaped core 6.6a, the holding member 4.4
A cylindrical elastic member 8.8a is disposed in a U-shaped hollow portion formed from the rear side of each of a and 5.5a.

In addition, a wedge surface 6b is formed at the wide notched end of the wedge-shaped core 6.6a, and the length and angle of the wedge surface 6b are different from each other on the left and right sides. (Or only one side) Since the shaft 13.13a is long and large, the wedge-shaped core 6.6a can move in the axial direction.

The electrode tip is removed by pressing the core 6.6a configured as described above in the axial direction using the pressure mechanism arrow 9.9a.

Shank holding member 4.4a and tip holding members 5, 5 pressed against shank 1 and electrode tip 2
a grasps the shank 1 and the electrode tip 2 by crushing the cylindrical elastic member 8.8a.

When pressed further, the wedge surface 6b at the tip increases the gripping force, and the wedge surface 6b of the tip holding member 5.5a
Touch and press.

During this pressing, since the wedge surfaces at the left and right ends of the core 6.6a, which are formed widely apart in the radial direction, are arranged with different lengths and angles, the pressure on the left and right sides is biased, and the holding members 5, 5a Then, pressing down and twisting are simultaneously applied to the electrode tip 2, and the electrode tip is pulled out. (The larger the distance between the wedge surfaces at the left and right ends, the greater the torsion force.) It is also possible to supplement extraction by superimposing vibrations.

If the diameter of the shank 1 is large, if the upper surface of the core 6 is brought into direct contact with the shank surface, the shank holding member 4
．． 4a may be omitted.

Attaching the electrode tip.

The electrode tip is attached by press-fitting the tip into the taper of the shank using the pressure mechanism of the welding device. It is sufficient to supply the electrode tip to the fixed position.

That is, the electrode tips 2, 2a are arranged at regular intervals on the upper and lower surfaces of the outer circumferential portion of the disk 22, gripped and held by elastic members 2323a, and are intermittently rotated by the intermittent shaft 21 and stopped at fixed positions.

Next, a case will be described in which the electrode tip is replaced at the zero point position.

A core 6 of an electrode chip extraction means is fixed to the frame 16 and the arm 20, and the arm 20 is connected to the cylinder 19.
The electrode tip rotates around the pressurizing shaft 18 and is pressurized with the frame 16 side, and the electrode tip is extracted by the extraction device.

Two extracting devices are installed, one above the other, to extract the upper and lower chips at the same time.

After the arm 20 is opened, if the frame 16 is rotated in an arc 25 by the main shaft 17, the disk 22 on which the electrode tips are arranged vertically moves from the position of line B to the position of liA,
The electrode tip is supplied, and the pressure mechanism of the welding device is activated to attach the electrode tip.

After attachment, the frame 16 is rotated in the opposite direction and returned to the position of line B, and the disk 22 is intermittently rotated to prepare for the next electrode tip attachment.

A plurality of disks 22 on which electrode chips are arranged are prepared, and the electrode chips are replenished by replacing each disk.

The frame 16 may be fixed, and the welding device may be moved to the position of line B using a robot to attach the electrode tip.

(Effects of the Invention) As described above, the electrode tip replacement device of the present invention grasps and extracts electrode tips by pressing in the axial direction, and the electrode tips arranged at regular intervals on a disk are transferred to a welding device. The entire device is compact and simple, and the electrode tips can be replaced automatically in a short time by attaching the device using the pressurizing mechanism and replacing the disk itself where the electrode tips are lined up to replenish the electrode tips.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of an electrode chip extraction device. FIG. 2 is a side view including the AA cross section in FIG. 1. FIG. 3 is a plan view showing an embodiment of the replacement device of the present invention, and FIG. 4 is a partial sectional view of the disk 22. 1, shank, 2. Electrode tip, 4.4a Shank holding member, 5, 5a Chip holding member, 5b, Wedge surface attached to tip holding member, 6, Wedge-shaped core, 6b< Wedge surface attached to wedge-shaped core, 8.8a , cylindrical elastic material, 99a, arrow indicating pressing force, 13.13a. Shaft, 14.14a elastic material, 16. Frame, 17, main axis, 18. axis, 19. Pressure cylinder, 20, arm, 21
1 intermittent shaft, 22° disc, 23.23a, elastic material, 251
Arc of rotation, A, B line indicating rotation position, C1 replacement position,

Claims (1)

[Claims] 1) A means for extracting the electrode tip by applying pressure in the axial direction, and a means for supplying the electrode tip by intermittently rotating disks arranged on the upper and lower surfaces of the outer periphery with the tips of the electrode tips facing each other at regular intervals. An electrode tip replacement device comprising means for attaching an electrode tip by utilizing a pressure mechanism of a welding device. 2) The electrode tip replacement device according to item 1, wherein the electrode tip extraction means and the electrode tip supply means are alternately replaced and replaced at the same position. 3) The first method is characterized in that electrode tips are replenished by replacing disks arranged with electrode tips facing each other at regular intervals.
The electrode tip replacement device according to item 2. 4) A means for grasping the electrode tip by pressing the electrode tip holding member in the axial direction, and a wedge on different left and right sides in the radial direction press the electrode tip holding member, apply twisting and axial force at the same time, and pull it out. An electrode tip replacement device characterized by: