Narrow-gap welding seam molten pool monitoring device and welding system

Abstract

The utility model discloses a narrow-gap welding seam molten pool monitoring device and a welding system. The narrow-gap welding seam molten pool monitoring device comprises a camera unit, a lens group and a light source unit which are sequentially connected. The lens group is provided with a periscopic lens, and the whole lens group is slender, so that the lens group can extend into a narrow and deep welding seam; through the slender lens group, the monitoring device can extend into a narrow-gap welding seam, so that the defect that an existing molten pool camera cannot approach a molten pool to perform high-definition imaging on the molten pool is overcome, and welding seam centering of a welding gun in narrow-gap welding can be realized; a molten pool can be monitored in real time, molten pool information in the welding process is recorded, and workers are helped to adjust welding parameters and analyze welding quality.

Description

TECHNICAL FIELD

[0001] The utility model relates to additive welding technical field especially relates to a narrow gap weld pool monitoring device and welding system. BACKGROUND

[0002] Narrow gap welding as a kind of efficient, energy-saving and environmental protection welding method, in aerospace, nuclear power, petroleum chemical industry thick wall structure connection in the field of piece has been widely used.

[0003] The molten pool state in the welding process has important influence on the weld forming and welding quality, but ordinary welding camera cannot approach welding point for close-range shooting due to the influence of the characteristics of narrow and deep narrow gap welding groove and long and complex weld.

[0004] The narrow and deep small-angle groove used in narrow gap welding causes physical obstruction, so that ordinary molten pool camera cannot approach the molten pool, and it is difficult to monitor the molten pool state accurately in real time;It is affected by the existence of alternating bright and dark strong arc light in the welding process, so that different endoscopes cannot clearly image in the welding process. INVENTION CONTENTS

[0005] The utility model provides a narrow gap weld pool monitoring device and welding system, at least can solve the problem pointed out in the background art.

[0006] A narrow gap weld pool monitoring device, comprising camera unit, lens group and light source unit connected in sequence;

[0007] The lens group has periscopic lens, and its whole is elongated, so that the lens group can be inserted into the narrow and deep workpiece weld.

[0008] Preferably, the camera unit includes a camera housing, an image sensor, a filter and a control board arranged in the camera housing;

[0009] The filter is located on the side of the image sensor close to the lens group;

[0010] The image sensor is connected to the control board by a wire.

[0011] Preferably, the camera housing includes a camera front cover and a camera rear cover, and the camera front cover is connected with the lens group.

[0012] Preferably, the camera unit further includes a power interface and a data interface.

[0013] Preferably, the light source unit includes a light source and a power supply wire connected with the light source.

[0014] Preferably, the light source cooling structure is provided with a cooling channel extending along the length direction of the mirror group, and the light source is mounted at the end of the light source cooling structure.

[0015] Preferably, the light source protection mirror is mounted at the light source.

[0016] Preferably, the light source is a sheet-shaped laser light source.

[0017] Preferably, the width of the light source is less than 8mm.

[0018] A welding system comprising the above narrow gap weld pool monitoring device and a welding torch.

[0019] Compared with the prior art, the beneficial effects of the present application are as follows: through the elongated mirror group, the monitoring device can be inserted into the narrow gap weld, thereby solving the defects that the existing weld pool camera cannot approach the weld pool and cannot realize high-definition imaging thereof, and the weld seam centering of the welding torch in narrow gap welding can be realized; the weld pool can be monitored in real time, the weld pool information in the welding process can be recorded, the welding parameters can be adjusted by the staff, and the welding quality can be analyzed. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 The present application is a structural explosion schematic diagram;

[0021] Fig. 2 The present application is a structural schematic diagram.

[0022] MARKS DESCRIPTION:

[0023] 1-camera front cover, 2-camera rear cover, 3-control panel, 4-image sensor, 5-filter, 6-battery, 7-mirror group, 8-periscopic lens, 9-light source, 10-light source cooling structure, 11-protection mirror. DETAILED DESCRIPTION

[0024] The present application is a structural explosion schematic diagram;

[0025] Example one

[0026] As Figs. 1-2 shown, the narrow gap weld pool monitoring device provided by the present application comprises a camera unit, a mirror group 7 and a light source unit connected in sequence;

[0027] The mirror group 7 has a periscopic lens 8, and the whole is elongated, so that the mirror group 7 can be inserted into the narrow and deep weld; in addition, the mirror group 7 of the periscopic lens 8 can change the angle of light, so that the monitoring device can be parallel to the position of the welding torch, and avoid occupying too much environment,

[0028] The camera unit comprises a camera shell, an image sensor 4, a filter 5 and a control board 3 arranged in the camera shell, the camera shell comprises a camera front cover 1 and a camera rear cover 2, the camera front cover 1 is connected with a lens group 7, the filter 5 is located on the side of the image sensor 4 close to the lens group 7, the image sensor 4 is connected with the control board 3 through a wire, and the control board 3 is provided with a WIFI module for transmitting a camera picture;

[0029] Since the light in the red light band and the near-infrared band generated in the welding arc is weak, and most common photosensitive chips can receive light in the red light band and the near-infrared band, the narrow-band filter 5 in the red light band and the near-infrared band is adopted in the embodiment, and the wavelength of the laser generated by the laser is preferably consistent with the central wavelength of the narrow-band filter 5;

[0030] The camera unit further comprises a power interface and a data interface for power supply and data transmission, wherein the data interface can be selected from a standard USB interface, a micro USB interface, a mini SUB interface, a type-C interface and the like;

[0031] The light source unit comprises a light source 9 and a power supply wire connected with the light source 9, and the power supply wire can be directly connected with the battery 6 in the camera unit;

[0032] The arc is weak in the near-infrared band, so the light source 9 in the embodiment is selected as a sheet-shaped laser light source which can generate near-infrared band laser, the control board 3 lights up the light source 9 through the power supply wire, illuminates the weld joint of the workpiece in the narrow gap, forms diffuse reflection, enters the lens group 7 through the lens light inlet, and finally converges on the image sensor 4 to form an image;

[0033] The light intensity of the laser generated by the sheet-shaped light source is greater than the light intensity of the arc light in the same wavelength band, the welding generated arc light, the laser reflected by the workpiece and the ambient light with negligible brightness in contrast to the former two are irradiated into the elongated lens group 7 designed in the embodiment to meet the characteristics of the narrow gap weld joint being narrow and deep, and irradiate to the surface of the image sensor 4

[0034] The lens group 7 images by converging the light to a point through refraction, filters the light other than the required wavelength light in the image presented by the lens through the narrow-band filter 5, the image sensor 4 converts the single-wavelength light signal into an electrical signal, collects a video image, and transmits the video to the upper computer (such as a computer or other device capable of presenting a video image) through the communication mode of USB, network cable or WIFI for processing and saving, so as to monitor the molten pool in real time, record the molten pool information in the welding process, help the staff to adjust the welding parameters, and analyze the welding quality;

[0035] The image sensor 4 of the embodiment is a CMOS sensor, and in other embodiments, the image sensor 4 is a CCD sensor;

[0036] The sheet-shaped laser light source is a light source array group composed of a patch light source such as a semiconductor laser and the like, or a point light source group similar to the patch light source, and the power and wavelength range of the light source 9 are within a preset range, so that the arc light and ambient light can be filtered out subsequently;

[0037] In other embodiments, the light source 9 generates a single waveband of high-power laser for illumination, so as to offset the influence of the arc light on the video acquisition of the industrial camera.

[0038] The sheet-shaped light source is arranged in a strip shape with a width less than 8 mm at the front end of the lens, and is placed at a position of 4-10 mm from the welding wire 4, i.e., the welding working area, so as to be close to the range of the molten pool and image the molten pool. Of course, the position can be adjusted adaptively according to the actual welding temperature and other factors by those skilled in the art.

[0039] Compared with the existing molten pool camera, the monitoring device of the embodiment can be closer to the molten pool and acquire images of the welding working area, so as to improve the resolution and clarity of the images, reduce the distortion and noise of the images, and improve the quality and accuracy of the images. The existing molten pool camera usually needs to be installed at a certain distance and angle, and is limited by the mismatch between the narrow gap welding environment and the camera volume, so that complete and clear images cannot be obtained, which affects the quality and accuracy of the images.

[0040] In other embodiments, the light source cooling structure 10 is further included, the light source cooling structure 10 is a shell structure, and a cooling channel extending along the length direction of the lens group 7 is arranged in the shell structure. The cooling channel can be water-cooled or oil-cooled, and the embodiment is water-cooled. The light source is installed at the end of the light source cooling structure 10. The light source cooling structure 10 is further provided with a protection mirror 11 clamp, so as to install the light source protection mirror 11 at the light source.

[0041] In addition, the light source cooling structure 10 is provided with a groove for accommodating the power supply wire.

[0042] Embodiment two

[0043] The embodiment provides a welding system, which comprises the narrow gap welding seam molten pool monitoring device of embodiment one and a welding torch.

[0044] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit and the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0045] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment according to the present specification needs to exhibit each and every characteristic specified in the present specification. The specification can also be described in terms of a single independent technical solution, but this does not mean that each embodiment contains only one independent technical solution. The specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A narrow gap weld puddle monitoring device, characterized by, The camera unit, the lens group (7) and the light source unit are connected in sequence. The lens group (7) has a periscopic lens (8) and is in an overall elongated shape, so that the lens group (7) can extend into a narrow and deep workpiece weld seam. The camera unit comprises a camera housing, an image sensor (4), a filter (5) and a control board (3) arranged in the camera housing. The filter (5) is located on the side of the image sensor (4) close to the lens group (7). The image sensor (4) is connected with the control board (3) through a wire.

2. The narrow gap weld puddle monitoring device of claim 1, wherein, The camera housing comprises a camera front cover (1) and a camera rear cover (2), and the camera front cover (1) is connected with the lens group (7).

3. The narrow gap weld puddle monitoring device of claim 1 wherein, The camera unit further comprises a power interface and a data interface.

4. The narrow gap weld puddle monitoring device of claim 1, wherein, The light source unit comprises a light source (9) and a power supply wire connected with the light source (9).

5. The narrow gap weld puddle monitoring device of claim 4, wherein, Further comprising a light source cooling structure (10), a cooling channel extending along the length direction of the lens group (7) is arranged in the light source cooling structure (10), and the light source (9) is installed at the end of the light source cooling structure (10).

6. The narrow gap weld puddle monitoring device of claim 4, wherein, Further comprising a light source protection mirror (11) installed at the light source (9).

7. The narrow gap weld puddle monitoring device of claim 4 wherein, The light source (9) is a sheet-shaped laser light source.

8. The narrow gap weld puddle monitoring device of claim 7, wherein, The width of the light source (9) is less than 8mm.

9. A welding system characterized by, The narrow gap weld pool monitoring device and the welding torch according to any one of claims 1-8.

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