JPH0726073U - Automatic welding tip diameter detection device - Google Patents

Abstract

(57) [Summary] [Purpose] The tip diameter of the welding tip that can detect a pair of welding tips of a spot welding device at the same time, guarantee accurate detection by eliminating dust and the like, and can be provided at low cost. Obtain an automatic detection device. [Structure] A device for automatically detecting the tip diameter of a welding tip in a spot welding device by a sensor, in which a hole for simultaneously inserting the upper and lower welding tips is formed in the main body of the apparatus, and the upper and lower welding tips are faced to the hole. Two pairs of sensors, such as a photoelectric sensor, that detect the tip diameter of each of the two are simultaneously provided. An air blow mechanism is provided facing the hole into which the welding tip is inserted in the main body of the apparatus. A floating mechanism is provided by attaching an elastic body such as rubber or a spring and a rotating mechanism to the apparatus body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for automatically detecting the tip diameter of a welding tip in a spot welding device.

[0002]

[Prior art]

 In spot welding, a welded part is sandwiched between a pair of welding tips and welded. However, if the tip of the welding tip is unevenly worn or chipped, the tip diameter may change, resulting in poor welding. Therefore, conventionally, the tip diameter of the welding tip is individually detected and periodically replaced, and the worn or damaged welding tip is dressed and reused.

[0003]

[Problems to be solved by the device]

 In order to detect the tip of the welding tip, for example, it is possible to use a camera or to see it with the eyes.However, since it is necessary to detect a pair of welding tips separately, it takes a lot of time and labor. However, there is a problem that accurate detection cannot be performed in an environment such as dust, and in the case of a camera, the detection device becomes expensive. The present invention has been made to solve such a conventional problem, and can detect a pair of welding tips of a spot welding device at the same time, and can ensure accurate detection by chasing dust and the like and can be provided at low cost. The problem was the automatic tip size detection device for welding tips.

[0004]

[Means for Solving the Problems]

 As a means for technically solving the above-mentioned problems, the present invention is an apparatus for automatically detecting the tip diameter of a welding tip in a spot welding apparatus by a sensor, in which upper and lower welding tips are simultaneously inserted into the body of the apparatus. The gist is that a hole is formed and two pairs of sensors, such as photoelectric sensors, which detect the tip diameters of the upper and lower welding tips at the same time facing the hole are arranged. In addition, an air blow mechanism is provided so as to face a hole for inserting a welding tip in the apparatus body, and a floating mechanism is provided by attaching an elastic body such as rubber or spring and a rotation mechanism to the apparatus body. To do.

[0005]

[Work]

 The upper and lower welding tips can be inserted into the holes of the main body at the same time, and two pairs of sensors can be activated to detect the tip diameters of the upper and lower welding tips at the same time. Further, if air is blown at the time of detection, dust and the like adhering to the welding tip can be eliminated, so that accurate detection can be guaranteed, and the device body is less expensive than conventional detection devices.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a device body formed in a rectangular parallelepiped shape, and mortar-shaped insertion holes 2 and 3 are coaxially and symmetrically provided on the upper surface and the lower surface thereof, and these insertion holes 2 and 3 are formed. It communicates with the communication hole 4 in the center.

Reference numerals 5 and 6 are opened from one side surface 1 a of the apparatus body 1 to the central communication hole 4, and are further removed from the opposite surface of the communication hole 4 to the other side surface 1 b of the apparatus body 1. And the upper and lower photoelectric sensors 7 and 8 composed of a light-emitting body and a light-receiving body are provided in the mounting holes 5 and 6, 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 hole 5 and faces the upper side surface of the communication hole 4. Therefore, the light emitter 7a and the light receiver 7b face each other at the upper part of the communication hole 4. Lead wires 7c and 7d such as optical fibers are connected to the rear portions of the light emitter 7a and the light receiver 7b, respectively, and led out to the outside of the apparatus main body 1.

Similarly, in 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 mounted from the side surface 1b. The light receiving surface inserted into the hole 5 faces the upper side surface of the communication hole 4, and the light emitting body 8a and the light receiving body 8b face each other in the lower portion of the communication hole 4. Further, lead wires 8c and 8d such as optical fibers are connected to the rear portions of the light emitter 8a and the light receiver 8b, respectively, and are led out to the outside of the device body 1.

An air blow mechanism 9 is provided with a small hole 9a opened from the rear end surface 1c of the apparatus body 1 to the side surface of the central portion of the communication hole 4 as shown in FIG. 2, and the air supply pipe 9 is provided in this small hole 9a. By connecting 9b, compressed air can be injected into the communication hole 4.

The apparatus for automatically detecting the tip diameter of a welding tip according to the present invention has the above-mentioned structure, and as shown in FIG. 1, a pair of upper and lower welding tips 10 and 11 are simultaneously inserted into the insertion holes 2 and 3 of the apparatus body 1. However, the tip diameters of the welding tips 10 and 11 can be simultaneously detected by the two pairs of photoelectric sensors 7 and 8.

FIG. 3 shows a state in which the welding tips 10 and 11 are inserted into the insertion holes 2 and 3 and the apparatus main body 1 is grasped, and the tip surfaces 10 a and 11 a of the welding tips 10 and 11 are inserted from the insertion holes 2 and 3, respectively. It projects a little into the communication hole 4 in the center. At this time, the mortar-shaped insertion holes 2 and 3 are preset so as to fit the tapered surfaces 10b and 11b of the welding tips 10 and 11 exactly.

When this state is maintained and the two pairs of photoelectric sensors 7 and 8 are actuated, that is, when light is emitted from the light emitter 7a of the upper photoelectric sensor 7, the light beam is blocked by the tip surface 10a of the upper welding tip 10. As a result, the amount of light received by the light receiving body 7b changes, and the diameter of the tip surface 10a can be detected by this change in the amount of light. At the same time, the lower photoelectric sensor 8 allows the tip surface of the lower welding tip 11 to be detected. The diameter of 11a can be detected.

At the time of this detection, in order to amplify the signals from the photodetectors 7b and 8b of the upper and lower photoelectric sensors 7 and 8, the signals are input to an amplifier 12 as shown in FIG. It is preferable that the tip diameters of the upper and lower welding tips 10 and 11 are numerically displayed by connecting to the. When the numerical value of the tip diameter is abnormal, the warning light 13a of the monitor panel 13 is made to blink or an alarm sound is emitted to notify the abnormality.

If dust or the like is attached to the tips of the welding tips 10 and 11, the tip diameter will be inaccurately detected. Therefore, before detection by the photoelectric sensors 7 and 8, from the small hole 9 a of the air blow mechanism 9. Compressed air is ejected to blow out dust and the like.

Further, when the upper and lower welding tips 10 and 11 are inserted into the insertion holes 2 and 3 of the apparatus body 1, the axes of the welding tips 10 and 11 and the axes of the insertion holes 2 and 3 should not be displaced. It is desirable to have a floating mechanism. As a floating mechanism, when detecting the tip diameters of both upper and lower tips of the welding gun simultaneously and rapidly, the influence during pressurization is large, so for example, as shown in Figs. 4 and 5, there is a rotating mechanism with rigidity and durability. It is preferable to use a rocking type. That is, the structure is attached to the rotating bodies 14a and 14b, which are rotatable around the X axis and the Y axis respectively, and have bearings or bushes at both ends, and can be freely adapted to the inclination of both upper and lower chips, and the structure is not displaced from the axis of the insertion holes 2 and 3. In addition, the Z-axis is improved in detection reliability by the floating mechanism 14 in which the elastic body 14c such as rubber or spring prevents the axis line from being displaced.

Although a transmissive photoelectric sensor is used in the above embodiment, the present invention is not limited to this, and it is possible to use other suitable sensors.

[0018]

[Effect of device]

 As described above, according to the present invention, the upper and lower welding tips are inserted into the device body having a simple structure, and the tip diameters thereof can be simultaneously detected by the two pairs of photoelectric sensors, which facilitates the detection work. In addition to the above, the work efficiency can be remarkably increased, and the air blow mechanism has an excellent effect such that dust and the like adhering to the welding tip are chased away to ensure accurate detection and can be provided at low cost. In addition, by adding a floating mechanism to the main body of the device, the upper and lower welding chips are aligned with the axis of the insertion hole of the main body of the device to ensure reliable insertion, thereby improving the detection reliability.

[Brief description of drawings]

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

FIG. 2 is a plan view of the apparatus body.

FIG. 3 is a schematic cross-sectional view showing a state in which the tip diameters of the upper and lower welding tips are simultaneously detected.

FIG. 4 is a perspective view showing an example of a floating mechanism.

FIG. 5 is a partially cutaway side view of the same.

[Explanation of symbols]

1 ... Device body 2, 3 ... Insertion hole 4 ... Communication hole
5, 6 ... Mounting hole 7 ... Upper photoelectric sensor 8 ... Lower photoelectric sensor 9 ... Air blow mechanism 10, 11 ...
Welding tip 12 ... Amplifier 13 ... Monitor board
14 ... Floating mechanism

Claims (3)

[Scope of utility model registration request] 1. A device for automatically detecting a tip diameter of a welding tip in a spot welding device by a sensor,
A hole for inserting the upper and lower welding tips at the same time is formed in the main body of the apparatus, and two pairs of sensors, such as photoelectric sensors, for detecting the tip diameters of the upper and lower welding tips at the same time facing the hole are arranged. Automatic welding tip diameter detection device. 2. The automatic tip diameter detecting device for a welding tip according to claim 1, wherein an air blow mechanism is provided so as to face a hole into which the welding tip is inserted in the main body of the apparatus. 3. The automatic tip diameter detecting device for a welding tip according to claim 1, wherein an elastic body such as rubber or a spring and a rotating mechanism are attached to the main body of the apparatus to provide a floating mechanism.