JPH0415419Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a magnifying projection device for welding, and its purpose is to illuminate the area around the arc generated from the welding machine to increase the brightness of the welding part and other surrounding areas. to clarify the projection of the welded part and other surroundings,
In addition to allowing precision welding work, it also simplifies the installation of lighting equipment, making it easy to install and remove lighting equipment when switching between welding work that requires precision and welding work that does not require precision. An object of the present invention is to provide a magnifying projection device for welding that can be used to perform welding.

(Prior art and its problems) Conventionally, as shown in FIG. 3, a welding magnifying projection device a has a main body in which a cylindrical light intrusion case c is provided on a rectangular box-shaped reflected light expansion case b. d, a light entrance lens e provided at the tip opening of the light entry case c, and a first reflecting mirror f housed in the device main body d.
It consists of a second reflecting mirror g, a screen h provided at the open end of the reflected light expansion case b, and a rotatable mounting arm i that supports the device main body d.

In order to use this conventional welding magnifying projection device a, when welding a welding part k with an arc m generated from the tip of an arc welding rod 1, the entrance lens e is brought close to the welding part k of the workpiece j. After the reflected light o from the welding part k illuminated by the arc m enters the light entry case c from the light entrance lens e, it passes through the reflection from the first and second reflecting mirrors f and g. The welded portion k is enlarged and projected onto the screen h.

In this way, with the conventional welding enlargement projection device a, the welding part k can be enlarged on the screen h, but the luminous intensity of the direct light of the arc m and the reflected light of the arc m reflected at the welding part k is weakened during the expansion process. However, since the direct light of the arc m has a relatively large luminous intensity compared to the reflected light of the arc m, the welding part k and its surroundings are The brightness of the arc m is relatively small compared to the arc m, and the welding part and its surroundings are not clearly projected on the screen h, and the welding part k
It was difficult to perform precise welding work, and it was especially difficult to weld bellows-type air springs, etc., which required precision.

On the other hand, it is conceivable to attach a high-intensity illumination light source to this conventional welding magnifying projection device a, but generally high-intensity illumination light sources have a large load and a large shape, so the number of mounting brackets is also required. This causes a problem in that the illumination light source cannot be easily attached or removed when switching between precision welding, which requires an illumination light source, and normal welding, which does not require an illumination light source.

(Means for Solving the Problem) This invention was made to solve the above problem, and it is a reflected light expansion case in which a cylindrical light entry part is formed on the upper part of the case which is approximately in the shape of a truncated square pyramid. , an optical fiber cable detachably attached to the circumferential surface of the light infiltration part of this reflected light expansion case via a mounting bracket, and the cylindrical light infiltration part has an opening at its tip and a circumferential surface. The lower part is connected in communication with the upper part of the substantially quadrangular truncated pyramid-shaped case, and the tip opening is provided with a light entrance lens, and the rear end part reflects light that enters through the light entrance lens. A first reflecting mirror is housed in the truncated pyramid-shaped case, and a second reflecting mirror is housed in the substantially quadrangular truncated pyramid-shaped case to reflect the reflected light reflected by the first reflecting mirror. At the same time, a screen device is provided on the end face facing the second reflecting mirror to project the reflected light expanded by the second reflecting mirror, and the optical fiber cable directs its irradiation end face towards the welding part. An illumination lens is provided at the tip of the irradiation end surface of this optical fiber cable, and the illumination light is irradiated onto the workpiece from the irradiation end surface of the optical fiber cable with this illumination lens interposed. All of the above problems are solved by providing a tangent enlargement projection device having the following characteristics.

(Example) An embodiment of this invention will be described in detail based on the drawings.

1 and 2 show a welding magnifying projection device 1 according to an embodiment of this invention. A reflecting mirror expansion case 4 in which a light intrusion part 3 is formed, and a light intrusion part 3 of this reflection mirror expansion case 4
It consists of an optical fiber cable 10 detachably attached to the peripheral surface.

The cylindrical light inlet part 3 has an opening at its tip, and a light entrance lens 5 is installed in this opening, and the rear end receives the light entering from the light entrance lens 5. A first reflecting mirror 6 in the form of a flat plate is housed and installed.

The lower part of the circumferential surface of the light intrusion part 3 is connected in communication with the upper part of the case 2 having a substantially quadrangular pyramid shape to form a reflector expansion case 4.

A flat second reflecting mirror 7 that further reflects the reflected light reflected by the first reflecting mirror 6 is housed in the substantially quadrangular truncated pyramid-shaped case 2.
A screen device 8 for projecting the reflected light expanded by the second reflecting mirror is provided on the end face facing the second reflecting mirror 7, and a light shielding hood 11 is provided around the screen device 8. has been done.

The screen device 8 consists of a double structure of a screen 8-1 and a neutral density filter 8-2 that partially overlaps the screen 8-1.

Of these, the neutral density filter 8-2 is the screen 8.
Normally, the light is attenuated only at the focal point, and if the welding point is shifted from the center of the screen 8-1, the attenuation filter 8-2 moves to that position along the screen 8-1. It is installed so that it can be used.

In this invention, it is optional whether the screen device 8 is constructed from only the screen 8-1 or from the screen 8-1 and the neutral density filter 8-2.

In the reflector expansion case 4 having such a configuration, the light generated by welding passes through the light input lens 5.
The light is spread out and entered into the intrusion part 3, first reflected diagonally downward by the first reflecting mirror 6, and then this reflected light is further reflected by the second reflecting mirror 7 and projected onto the screen device 8. be done.

In this invention, the first reflecting mirror 6 and the second reflecting mirror 7 are provided to project the light beam expanded by the incident lens 5 onto the screen device 8.

Such a reflected light expansion case 4 is rotatably supported via a rotary mounting arm 12.

In this invention, an optical fiber cable 10 is removably attached to the circumferential surface of the light entry section 3 of the reflected light expansion case 4 having the above-mentioned configuration via a mounting bracket, with its irradiation end surface 22 facing the welded portion 21. .

An illumination lens 19 is provided at the tip of the irradiation end surface 22 of the optical fiber cable, and illumination light is irradiated onto the workpiece from the irradiation end surface 22 of the optical fiber cable 10 with the illumination lens 19 interposed.

In the illustrated embodiment, the mounting bracket 9 includes a support protrusion 13 protruding from the circumferential surface of the light intrusion section 3, a clip 14 that clamps the optical fiber cable 10, and a clip 14 that can be detachably attached to the support protrusion 13. It consists of a metal fitting fixing knob 15 for fixing.

Of these, the clip 14 consists of a cylindrical mounting leg 17 having a notch 16 formed in a portion of its circumferential surface in the axial direction, and a flat mounting leg 17 extending from the notch 16.

In the figure, 18 is a fiber case into which the tip of the optical fiber cable 10 is inserted, and 19 is an illumination lens provided at the tip of the case 18.

With such a mounting bracket 9, the optical fiber cable 10 is held between the mounting legs 17 of the crib 14, and is detachably supported on the support protrusion 13 via the bracket fixing knob 15 inserted through the mounting leg 17. Irradiation end face 2 of optical fiber cable 10
2 is directed toward a workpiece 21 such as a bellows type air spring 20 with an illumination lens 19 interposed therebetween.

One embodiment of this invention is constructed as described above, and this welding magnifying projection device 1 is used in welding work of objects to be welded that requires precision, such as manufacturing bellows type air springs 20. For this purpose, the light entering lens 5 is brought close to the welded part 21 of the bellows type air spring 20, and the welded part 2 is inserted from the arc welding rod 23.
1 by blowing the arc 24 to weld the welding part 21, while irradiating the illumination light 25 from the irradiation end face 22, the direct light of the arc 24, the reflected light of the arc 24 reflected from the welding part 21 and its surroundings, The reflected light of the arc 25 reflected from the welding part 21 and its surroundings enters the light entry part 3 from the light entry lens 5, and these lights are spread through the first reflecting mirror 6 and the second reflecting mirror 7. An image is formed on the screen 8-1 while the welding part 21 and its surroundings are enlarged and projected.

At this time, the screen 8 on which the arc 25 is projected
Neutral density filter 8 pre-positioned at position -1
If -2 is overlapped, arc 25
The light is dimmed and projected onto the screen 8-2,
The difference in brightness around the arc 25 becomes smaller.

On the other hand, in order to use the welding magnifying projection apparatus 1 for welding work that does not particularly require precision, the metal fixture fixing knob 15 may be removed and the optical fiber cable 10 may be removed from the apparatus main body 4.

(Effects) As explained above, this invention consists of a reflected light expanding case in which a cylindrical light entering section is formed on the upper part of the case having a substantially quadrangular truncated pyramid shape, and a peripheral surface of the light entering section of the reflected light expanding case. and an optical fiber cable detachably attached via a mounting bracket to the cylindrical light inlet part, the tip of which is an opening, and the lower part of the circumferential surface communicates with the upper part of the substantially quadrangular pyramid-shaped case. A light entrance lens is provided at the front end opening, and a first reflecting mirror for reflecting light that enters through the light entrance lens is housed and installed at the rear end. A second reflecting mirror that further expands and reflects the reflected light reflected by the first reflecting mirror is housed in the approximately quadrangular truncated pyramid-shaped case, and the end face opposite to the second reflecting mirror is provided with a second reflecting mirror. A screen device is provided for projecting the reflected light expanded by the second reflecting mirror, and the optical fiber cable is attached with its irradiation end face facing the welding part, and the irradiation end face of the optical fiber cable is An illumination lens is provided at the tip,
Since this is a close-use magnifying projection apparatus characterized in that illumination light is irradiated onto the workpiece from the irradiation end face of the optical fiber cable through the illumination lens, the following effects can be achieved.

To use this projection device in welding work that requires precision, such as in the manufacture of bellows-type air springs, the light input lens is brought close to the welding part of the workpiece, and the arc welding rod is placed on the welding part. While welding the welding part by blowing the arc, it is sufficient to irradiate the illumination light from the irradiated end face, and the direct light of the arc, the reflected light of the arc reflected at the welding part and its surroundings, and the reflected light of the welding part and its surroundings. The reflected light from the arc enters the light entry area from the light entrance lens, and these lights are spread out through the first and second reflecting mirrors and form an image on the screen, magnifying the welding area and its surroundings. On the other hand, the light reflected from the welded part and its surroundings increases the brightness by combining the reflected light of the arc and the reflected light of the illumination light. Compared to the previous model, the difference in brightness between the direct light of the arc and the reflected light is small, and the image of the welded part etc. is clearly projected, allowing precise work to be carried out.

On the other hand, to use the projection device for welding work that does not require particular precision, it is sufficient to remove the mounting bracket and remove the optical fiber cable from the device body. It is also lightweight and compact, requires fewer fixing screws, etc., and the optical fiber cable can be easily attached and detached.

In this invention, the screen device may consist of only a screen, or may consist of a dual structure consisting of a screen and a neutral density filter that overlaps a part of the screen; especially in the latter case, the arc of the screen It is sufficient to overlap the filters at the projection position in advance, and the tip of the arc is dimmed through the attenuation filter, making the difference in brightness between the arc projection part of the screen and its surroundings smaller, making it easier to confirm the welding part. This allows precise welding work to be performed more easily.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional side view of a magnifying projection device for welding according to an embodiment of the present invention, FIG. 2 is an illumination diagram of the same device, and FIG. 3 is a diagram illustrating the prior art. DESCRIPTION OF SYMBOLS 1... Enlarging projection device for welding, 2... Approximately quadrangular pyramid shaped case, 3... Light entry part, 4... Reflected light expansion case, 5... Light entrance lens, 6... First reflecting mirror,
7...Second reflecting mirror, 8...Screen, 8-1...
... Screen, 8-2 ... Neutral density filter, 9 ...
...Mounting bracket, 10...Optical fiber cable, 21...
...Welded part, 22... Irradiated end face.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A reflected light expanding case in which a cylindrical light entering portion is formed on the upper part of the case having a substantially quadrangular truncated pyramid shape, and a peripheral surface of the light entering portion of the reflected light expanding case. The cylindrical light inlet part has an opening at the tip and the lower part of the circumference is connected to the upper part of the substantially square pyramid-shaped case. The tip opening is provided with a light entrance lens, and the rear end is housed with a first reflecting mirror that reflects the light that enters through the light entrance lens. A second reflecting mirror that further expands and reflects the light reflected by the first reflecting mirror is housed in the truncated quadrangular pyramid-shaped case, and a second reflecting mirror is disposed on the end face opposite to the second reflecting mirror. A screen device is provided for projecting reflected light spread out by two reflecting mirrors, and the optical fiber cable is attached with its irradiation end face facing the welding part, and the tip of the irradiation end face of the optical fiber cable is installed. 1. A close-up magnifying projection apparatus, characterized in that an illumination lens is provided in the part, and illumination light is irradiated onto a workpiece from an irradiation end face of an optical fiber cable through the illumination lens. (2) The magnifying projection device for welding according to claim 1, wherein the screen device comprises only a screen. (3) The welding according to claim 1, wherein the screen has a dual structure of a screen and a neutral density filter that moves in parallel relative to the screen and overlaps a part of the screen. Enlargement projection device for use.