JPS60118376A - Monitor device for welding - Google Patents

Abstract

PURPOSE:To make a television camera extremely effective in two-way welding and to make the initial cost equiv. to the initial cost of a conventional monitor device used in one-way welding by enabling monitoring of two points with one television camera. CONSTITUTION:A selector switch of a control unit 12 is operated to drive a motor 34 to retract a mirror 29 to the position of an alternate long and two short dashes line in the case of projecting the light information taken in from the head 9b of an optical fiber 9 on a minitor receiver 14. The light information 24 taken in by the fiber 9 is made incident to an image receiving element 2 by which the information is converted to an electrical signal. Said signal is fed to the receiver 14. The selector switch of the unit 12 is operated reverse in the case of projecting the light information taken in from the head 9'b of the fiber 9' on the receiver 14. When the motor 34 is driven reverse to project the mirror 29 to the position of a solid line, the information 24' is reflected by the mirror 29 and is made incident to the element 2 which is fed to the receiver 14. On the other hand, the progression of the information 24 is interrupted by the mirror 29.

Description

Detailed Description of the Invention The present invention relates to a welding monitoring device.As a welding monitoring device, information on a welded part is captured by a television camera via an optical fiber, and the information is converted into an electrical signal by the television camera. There is a device that converts the electrical signal into a monitor receiver and displays the information on the welding part on the screen of the monitor receiver. Figures 1 and 2 show such a welding monitoring device. It is something. The main body of the television camera 10 includes an image receiving element 2.
A light controller 3 is installed at the front of the main body. The light controller 3 includes an aperture mechanism 4, a lens 5, a light attenuation filter 6, a light attenuation filter attaching/detaching mechanism 7, and a relay lens 8. At the front of this light controller 3,
A base end 9a of the optical fiber 9 is installed.

Further, an output terminal 10 is installed on the main body of the television camera 1, and a control unit 12 is connected to this output terminal 10 via a cable 11. A monitor receiver 14 is connected thereto.

In this welding monitoring device, a television camera 1 is installed in a welding device, and an optical fiber 90 head 9b is connected to a wire tip 16 of a filler wire 15 as shown in FIG.
be attached to.

Then, the tip of the electrode 18 of the welding torch 17, the welding arc 1
9. Steel material 20. Melt pool 21 and filler wire 15
The information on the welded part 22 including the tip of the welded part 22 is inputted to the relay lens 8 of the television camera 1 through the optical fiber 9, and further inputted to the image receiving element 2 via the aperture mechanism 4, the light attenuation filter 6, and the lens 5. The optical information of the welding part 22 input to the image receiving element 2 is converted into an electrical signal by the image receiving element 2, and is electrically transmitted to the control unit 12 via the cable 11, and further electrically transmitted to the monitor receiver 14 via the cable 13. The image is then displayed on the screen of the monitor receiver 14.

Note that the light attenuation filter 6 is used when the welding arc 19 occurs, and when monitoring when the arc disappears, the rotary lens 23 of the light attenuation filter attachment/detachment mechanism 7 is activated to block the light attenuation filter 6 from incident light. Tax exemption will be granted from 24th onwards.

By the way, during welding work, it is necessary to finely adjust the welding direction of the welding torch 17 and adjust the insertion position of the filler wire 15 inserted into the welding arc 19 and the molten pool 21. In order to monitor this, it is necessary to use the optical fiber 9.
-, it is preferable to position the rad 9b in front of the progress of welding.

There is no problem when applying the above-mentioned conventional technology to a welding device that performs welding by limiting the welding direction to only one direction. When applied, a thick orange problem arises.

Figure 3 shows a typical example in which welding is performed by moving the welding device in two directions, forward and reverse, and shows a welding device that performs a so-called distribution welding method that reverses the welding direction half a circumference of a circumferential joint of a fixed pipe. This is what is shown.

This welding work involves attaching a guide rail 26 to the outer periphery of the fixed pipe 25.
is installed, a welding device 27 is suspended on this guide rail 26, and this welding device 27 is moved in the directions of arrows A and B by a drive mechanism (not shown) to connect the fixed pipe 25. ．． 25 to each other.

Therefore, if the monitoring device is simply applied to such a welding device 27, it will be difficult to obtain necessary information when welding in one of the two directions, which may lead to a decrease in welding quality. There is.

In order to solve this problem, two sets of monitoring devices are prepared and their optical fibers 9, 9'
The heads 9 b and 9 b' may be installed on both sides of the welding torch 17 as shown in FIG. However, in order to use two sets of monitoring devices in this way, it is necessary to install two television cameras on the welding device 27, which increases the weight loaded on the welding device 27 and reduces the drive power of the welding device 27. The load on the mechanism increases. As a result, a separate welding device for mounting two television cameras must be designed and manufactured, and two additional television cameras must be prepared, increasing equipment costs.

This invention was developed in order to solve the above-mentioned problems, and the information on the welded part captured by the optical fiber head is taken into the television camera via the optical fiber.
The information is input to an image receiving element and converted into an electrical signal,
In a welding monitoring device that outputs the electrical signal from a television camera and inputs it to a monitor receiver, thereby displaying information on the welded part on the screen of the monitor receiver, the television camera is provided with two optical fibers fRf.
and a mirror and mirror movement between the proximal ends of the two optical fibers and the image receiving element for guiding only one of the information taken in by the optical fibers to the image receiving element. It is characterized by the installation of a light entry switch consisting of a mechanism.

Next, the present invention will be explained with reference to the drawings. FIG. 5 is a conceptual diagram of the welding monitoring device of the present invention.
FIG. 6 is a conceptual diagram showing a modification of the main part. In FIGS. 5 and 6, the same reference numerals as in FIG. 1 indicate the same elements as in FIG. 1.

This surveillance equipment has two optical fibers 9 and 9' attached to one television camera 1, and optical information incident on each optical fiber 9 and 9' is selectively transmitted to one image receiving element 2. It was designed to be sent to.

In this monitoring device, two optical fibers 9, 9
The base end 9a of the optical fiber 9 is placed in front of the television camera 1, and the optical fiber 9' The base end 9'a of each is installed on the side surface of the television camera 1. Inside the television camera 1, there are optical fibers 9, 9'.
A light entry switch 28 is installed at the location where the light information 24 and 24' intersect. The human optical path switch 28 includes a mirror 29 positioned at an angle of 45 degrees with respect to the optical axis of the optical fiber 9', and a mirror moving mechanism 30. The mirror moving mechanism 30 moves the mirror 29 at one end.
It is comprised of a holder 32 which holds a rack 31 at its other end, and a motor 34 which has a pinion 33 at its shaft end, and the pinion 33 meshes with the rack 31. therefore,
In this human optical path switching device 28, when the motor 34 is driven and the pinion 33 is rotated in one direction, the rack 31 is moved as the pinion 33 rotates, and the mirror 29 is moved to the position shown by the two-dot chain line. . Also, when the motor 34 is driven and the binion 33 is rotated in the opposite direction, the binion 33 is rotated in the opposite direction.
3, the rack 31 is moved in the opposite direction, and the mirror 29 is returned to its original position as shown by the solid line.

Further, on the optical axis of the optical fiber 9, an aperture mechanism 4, a light attenuation filter 6, a lens 5, and an image receiving element 2 are installed.

Since this monitoring device has the above-mentioned configuration, when it is desired to project the optical information taken in from the head 9b of the optical fiber 9 onto the monitor receiver 14, the changeover switch (not shown) of the control unit 12 must be ) to drive the motor 34 and retract the mirror 29 to the position indicated by the two-dot chain line as described above.

Then, the optical information 24 taken in by the optical fiber 9 is incident on the image receiving element 2 via the aperture mechanism 4, the light attenuation filter 6, and the lens 5, where it is converted into an electrical signal and sent to the monitor image receiver 14.

Furthermore, when attempting to project the optical information taken in from the head 9'b of the optical fiber 9' onto the monitor receiver 14, the changeover switch (not shown) on the control unit 12 must be operated in the opposite manner to the above. , the motor 34 is reversely driven to project the mirror 29 to the position indicated by the solid line as described above. Then, the optical information 24' taken in by the optical fiber 99' is transmitted to the mirror 2.
9, the light is reflected by the diaphragm mechanism 4, the light attenuation filter 6,
The light enters the image receiving element 2 through the lens 5, where it is converted into an electrical signal and sent to the monitor receiver 14. On the other hand, the optical information 24 from the optical fiber 9 is interrupted by the mirror 29 .

As described above, in this monitoring device, optical information from one of the optical fibers 9 and 9' is projected onto the monitor receiver 14.

Therefore, the head 9 of the optical fiber 9, 9'
b and 9'b are installed on both sides of the welding torch 170, the welding portion 22 can be monitored from both the front and rear in the direction of movement of the welding torch 17. Furthermore, FIG. 6 shows another embodiment of the mirror moving mechanism 30. This mirror moving mechanism 30 rotates the mirror 29, and moves the holder 35 holding the mirror 29 from the position indicated by the solid line to the position indicated by the two-dot chain line using a rotary solenoid 36, thereby transmitting the optical information 24 to the image receiving element. Let me guide you in the direction of 2,
Move the optical information 2 from the position of the two-dot chain line to the position of the solid line.
4' is guided toward the image receiving element 2.

In addition, in the embodiment described above, the optical fibers 9,
Although the optical information 9' is made incident on the television camera 1 at an angle of 90 degrees, the angle can be changed to an appropriate angle by changing the angle of the mirror 29.

As explained above, according to the present invention, it is possible to monitor two locations with one television camera, and therefore it is extremely effective in two-way welding, and the equipment cost is lower than that required for conventional one-way welding. There is almost no difference in equipment.

[Brief explanation of drawings]

Figure 1 is a conceptual diagram showing a conventional welding monitoring device, Figure 2 is a diagram showing how the optical fiber head is installed, Figure 3 is a diagram showing a two-way welding method, and Figure 4 is a diagram showing the installation mode of the optical fiber head. FIG. 5 is a conceptual diagram showing the welding monitoring device of the present invention, and FIG. 6 is a diagram showing a modification of the essential parts thereof. In the drawings, 1... TV camera, 2... Image receiving element,
3... Light controller, 4... Aperture mechanism, 5... Lens, 6... Light attenuation filter, 7... Light attenuation filter attachment/detachment mechanism, 9.9'... Optical fiber/ 6.9 a,
9'a - base end, 9b, 9'b... head, 12
...Control unit, 14...Monitor receiver, 15...Filer, 1
6...Wire tip, 17...Welding torch, 18.
...electrode, 19...welding arc, 20...steel material,
21... Molten pool, 22... Welded part, 24.
24'... Optical information, 25... Fixed tube, 26...
Guide rail 27...Welding device, 28...Light input step switch, 29...Mirror, 3o...Mirror moving mechanism, 31...Rack, 32...Holder, 33...
・Binion, 34... Motor 3 5... Ho
Ruda 36...Rotaline lenoid. Applicant Nippon Steel Pipe Works Co., Ltd. Agent Natsuo Shioya (and 2 others)

Claims (1)

[Claims] Information on the welded part captured by an optical fiber head is taken into a television camera via an optical fiber,
The information is input to an image receiving element and converted into an electrical signal,
In a welding monitoring device that outputs the electrical signal from a television camera and inputs it to a monitor receiver, thereby displaying information on the welding part on the screen of the monitor receiver, the two optical fibers are installed in the television camera. Also, a mirror and a mirror moving mechanism for guiding only one of the information taken in by both optical fibers to the image receiving element between the base ends of the two optical fibers and the image receiving element. 1- A welding monitoring device characterized by installing a flame optical path switch consisting of: