JPH07214340A - Automatic detecting device for critical life of welding tip - Google Patents

Abstract

PURPOSE:To properly judge the critical life of welding tip by providing a sensor to detect the critical life of welding tip in a top end diameter automatic detecting device to automatically detect a top end diameter of welding tip by a sensor. CONSTITUTION:The detection of the critical life of welding tips 17, 18, is detected by the fact that whether the beam is intercepted or photodetected while operating photoelectric sensors 13, 14 in upper/lower blocks 9, 10. That is, regarding an upper tip, in the case where it is usable, the beam is intercepted, in excess of the critical life, the beam is photodetected to a photoreceptor 13b because no beam is intercepted due to a small diameter of a tip holder 19. Accordingly, while the beam of the upper photoelectric sensor 13 is intercepted, the tip is usable, further, when it is not intercepted but photodetected, the tip is out of the critical life.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically detecting the limit of use of a welding tip in a spot welding device.

[0002]

2. Description of the Related Art The tip of a welding tip in a spot welding apparatus may be worn or chipped due to use and may cause welding failure. Therefore, the tip diameter of the welding tip should be checked, replaced appropriately, and removed. The tip is dressed at the tip for reuse. Conventionally, the tip diameter of the welding tip has been checked visually, but since it is inaccurate and the work is not easy, the applicant has made an improvement and applied for an automatic tip diameter detection device for the welding tip. (Jpn. Pat. Appln. No. 5-58527). This automatic tip diameter detection device inserts the upper and lower welding tips in the spot welding device into the holes of the main body of the equipment, and simultaneously detects the tip diameters of the upper and lower welding tips with a sensor such as a photoelectric sensor arranged facing the hole. It is designed so that it can be detected.

[0003]

However, according to the automatic tip diameter detecting device for the welding tip, the height of the welding tip (distance from the tip to the end face) cannot be detected, so that the use limit of the welding tip is limited. There is a problem that cannot be properly judged. The weld tip removed as described above is dressed and reused, but if dressed many times, the height becomes low and it becomes unusable. The present invention has been made to solve such a conventional problem, and appropriately determines the use limit of the welding tip by automatically detecting not only the tip diameters of the upper and lower welding tips of the welding device but also the height thereof. An object of the present invention is to provide a welding tip automatic use limit detection device that can be used.

[0004]

As a means for technically solving this problem, the present invention provides a tip diameter automatic detection device in which a tip diameter of a welding tip is automatically detected by a sensor. The gist is to provide a sensor to detect the usage limit of. In addition, the tip diameter automatic detection device has a hole for inserting the upper and lower welding tips at the same time,
Two pairs of photoelectric sensors that detect the tip diameters of the upper and lower welding tips at the same time facing the hole are installed.A block is attached to the top and bottom of this automatic tip diameter detection device, and the upper and lower welding tip usage limits are set in this block. The gist is that each photoelectric sensor for detecting is provided. Further, the gist is that a shim plate for adjusting the height position of the photoelectric sensor is interposed between the block and the automatic tip diameter detecting device.

[0005]

[Operation] The upper and lower welding tips of the spot welding equipment are inserted into the holes of the automatic tip diameter detection device at the same time, and the tip diameter is simultaneously detected by the sensor, and the usage limit of the welding tip is detected by the photoelectric sensor provided in the block. You can do it.

[0006]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a body for automatically detecting the tip diameter, and mortar-shaped insertion holes 2 and 3 are symmetrically provided on the upper surface and the lower surface of the main body, and a central communication hole 4 is provided.
Are communicated with.

Reference numerals 5 and 6 are opened in parallel from the one side surface 1a of the main body 1 to the central communication hole 4 and are vertically arranged so as to penetrate from the opposite surface of the communication hole 4 to the other side surface 1b of the main body 1. The mounting holes 5 and 6 are provided with sensors, for example, upper and lower photoelectric sensors 7 and 8 including a light emitting body and a light receiving body, respectively.

In the upper photoelectric sensor 7, the light emitting body 7a is inserted into the mounting hole 5 from the side surface 1a so that the light emitting surface faces the upper side surface of the communication hole 4, and the light receiving body 7b is mounted from the side surface 1b. The light-receiving surface is inserted into the communication hole 5 and faces the upper side surface of the communication hole 4. That is, the light emitter 7a and the light receiver 7b face each other at the upper part of the communication hole 4, and lead wires 7c and 7d such as optical fibers are connected to the rear of the light emitter 7a and the light receiver 7b, respectively. Has been pulled out.

Similarly to the lower photoelectric sensor 8, the light emitting body 8a is inserted into the mounting hole 5 from the side surface 1a so that the light emitting surface faces the lower side surface of the communication hole 4, and the light receiving body 8b is the side surface 1b.
Is inserted into the mounting hole 5 and the light receiving surface faces the upper side surface of the communication hole 4, and the light emitting body 8a and the light receiving body 8b are connected to each other through the communication hole 4
Face to face at the bottom of. Further, lead wires 8c and 8d such as optical fibers are connected to the rear portions of the light emitting body 8a and the light receiving body 8b and are led out to the outside of the main body 1.

Reference numerals 9 and 10 denote upper and lower blocks of a U-shape, which are fixed to the upper and lower surfaces of the main body 1 via shim plates 11 and 12 for adjusting the height position.

As shown in FIG. 3, the upper block 9 has both sleeve portions positioned so as to sandwich the insertion hole 2, and an upper photoelectric sensor 13 is attached to each of the sleeve portions so that the light emitters 13a and 13b face each other. Further, an air blow nozzle 15 is provided in the central portion and opens between both sleeve portions.

The light beam of the photoelectric sensor 13 is inserted into the insertion hole 2
When the end surface 17a of the upper chip 17 is positioned below the light beam as shown in FIG. 4, the chip holder 19 is smaller in diameter than the upper chip 17 and the upper photoelectric sensor is positioned. The thirteen rays are received without being blocked.

Similarly, in the lower block 10, both sleeve portions are positioned so as to sandwich the insertion hole 3, and lower photoelectric sensors 14 are attached to both sleeve portions, and the light emitting body 1 is provided.
4a and the light receiving body 14b face each other, and an air blow nozzle 16 is further provided in the central portion and opened between both sleeve portions.

Also in this case, the light beam of the lower photoelectric sensor 14 is blocked by the lower chip 18 placed in the insertion hole 3,
When the end surface 18a of the lower chip 18 is positioned above the light beam,
Since the diameter of the chip holder 20 is smaller than the diameter of the lower chip 18, it is positioned so that the light beam of the lower photoelectric sensor 14 is not blocked. In FIG. 3, reference numeral 21 is a dustproof cover.

The welding tip automatic use limit detecting apparatus according to the present invention is constructed as described above, and the upper and lower welding tips 17 and 18 of the spot welding apparatus as shown in FIG.
Of the welding tips 17 and 18
It is possible to detect the tip diameter of the welding tip and the usage limit of the welding tip.

To detect the tip diameters of the upper and lower welding tips 17 and 18, when the upper and lower photoelectric sensors 7 and 8 are actuated and light is emitted from the light emitter 7a of the upper photoelectric sensor 7, the light beam is directed to the tip surface of the upper welding tip 17. The amount of light received by the light-receiving body 7b is blocked and changes, and the diameter of the tip surface can be detected based on the change in the amount of light. At the same time, the lower photoelectric sensor 8 can detect the diameter of the tip surface of the lower welding tip 18.

The use limit of the welding tips 17 and 18 can be detected automatically by operating the photoelectric sensors 13 and 14 of the upper and lower blocks 9 and 10 and cutting off or receiving those rays of light. I can. That is, with respect to the upper chip 17, a usable state (upper end surface 17a
Is positioned above the light beam of the upper photoelectric sensor 13), the light beam is blocked by the upper chip 17, but the upper limit of the upper photoelectric surface 17a is lowered because the upper chip 17 is lowered due to wear or the like. (Located below the light beam of the sensor 13), the light beam is not blocked by the light because the chip holder 19 has a small diameter. In other words, the chip can be used while the light beam of the upper photoelectric sensor 13 is blocked, but if it is received without being blocked, the usage limit is exceeded. The same applies to the lower chip 18.

In detecting the use limit, the signals from the photodetectors 13b and 14b of the photoelectric sensors 13 and 14 are amplified by an amplifier (not shown), and a warning lamp of a monitor panel (not shown) connected to the amplifier is made to blink. Alternatively, it is preferable to inform the use limit of the welding tip by means such as sounding an alarm sound.

Further, by changing the thickness of the shim plates 11 and 12, the height positions of the photoelectric sensors 13 and 14 of the upper and lower blocks 9 and 10 can be easily adjusted, whereby the types of welding tips are different. However, it is possible to deal with it by setting the usage limit point arbitrarily.

Further, when the upper and lower welding tips 17 and 18 are inserted into the insertion holes 2 and 3 of the main body 1, air is jetted from the air blow nozzles 15 and 16 to remove dust and the like adhering to the tip surfaces. As a result, accurate detection can be guaranteed. Although a transmissive photoelectric sensor is used in the examples, the present invention is not limited to this, and other suitable sensors can be used.

[0021]

As described above, according to the present invention,
The upper and lower welding tips of the spot welding device are inserted into the holes of the main body, and not only the tip diameter of the upper and lower welding tips can be detected by the sensor, but also the usage limit of the tips can be detected, making the detection work easier. Along with this, it is possible to properly judge the replacement time and the usage limit time of the welding tip,
It has excellent effects such as preventing welding defects caused by the welding tip.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a perspective view of the same.

FIG. 4 is a cross-sectional view of a main part when the tip exceeds the usage limit.

[Explanation of symbols]

1 ... Main body 2, 3 ... Insertion hole 4 ... Communication hole 5, 6
... Mounting holes 7, 8 ... Photoelectric sensor 9, 10 ... Block 11, 12 ... Shim plate 13, 14 ... Photoelectric sensor 15, 16 ... Air blow nozzle 17, 1
8 ... Chip 19, 20 ... Chip holder 21 ... Dustproof cover

Claims (3)

[Claims] 1. A welding tip automatic detecting device for automatically detecting the tip diameter of a welding tip is provided with a sensor for detecting the limit of use of the welding tip. Usage limit automatic detection device. 2. An automatic tip diameter detection device is provided with a hole into which upper and lower welding tips are inserted at the same time, and two pairs of photoelectric sensors which face the holes and detect the tip diameters of the upper and lower welding tips at the same time. A block is attached to the upper and lower portions of the automatic tip diameter detection device, and photoelectric sensors for detecting the use limits of the upper and lower welding tips are provided in this block, respectively.
Automatic limit of use detection device for welding tip. 3. A shim plate for adjusting the height position of the photoelectric sensor is interposed between the block and the automatic tip diameter detecting device,
The use limit automatic detection device for a welding tip according to claim 2.