Laser welding spot optical detection device

Abstract

A laser welding spot optical detection device comprises an industrial camera, a connecting ring and an annular light source, a convex lens is arranged at the end of the industrial camera, a first connecting part is arranged at the position, located on the outer side of the convex lens, of the inner side wall of the industrial camera, a first light hole penetrating through the two ends of the connecting ring is formed in the connecting ring, and a second connecting part is arranged at one end of the connecting ring. The second connecting part is matched with the first connecting part, the other end of the connecting ring is provided with a plurality of groups of connecting positions, the annular light source is connected to the corresponding groups of connecting positions, the annular light source is provided with a light-emitting surface and a second light hole, the light-emitting surface is located on the end face, away from the industrial camera, of the annular light source, and the convex lens, the first light hole and the second light hole are concentrically arranged; the port, close to the convex lens, of the first light hole is a horn mouth which faces the convex lens. Compared with the prior art, the laser welding spot optical detection device not only can adapt to annular light sources of different specifications, but also can improve the detection effect.

Description

Technical Field

[0001] The invention belongs to the technical field of laser welding spot optical detection devices, and in particular relates to a laser welding spot optical detection device. Background Art

[0002] In the existing laser weld optical inspection device, the light source provides illumination for the industrial camera to inspect the welds. However, the existing light source and industrial camera are split structures, and it is difficult to adjust the two synchronously, which results in the light source being unable to provide sufficient illumination, or the illumination being uneven, affecting the inspection effect. In addition, the split mounting structure of the light source and industrial camera also makes it difficult to install and fix the two. At the same time, light sources of different sizes are not compatible with the same industrial camera. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a laser welding spot optical detection device.

[0004] To achieve the above objectives, the present invention discloses a laser welding spot optical detection device, comprising an industrial camera, a connecting ring and an annular light source, wherein the end of the industrial camera has a convex lens, and a first connecting portion is provided on the inner wall thereof at a position outside the convex lens, a first light-transmitting hole is provided in the connecting ring that runs through both ends thereof, a second connecting portion is provided at one end of the connecting ring, the second connecting portion cooperates with the first connecting portion, a plurality of connecting positions are provided at the other end of the connecting ring, the annular light source is connected to the corresponding groups of connecting positions, a light-emitting surface and a second light-transmitting hole are provided on the annular light source, the light-emitting surface is located at the end face thereof away from the industrial camera, and the convex lens, the first light-transmitting hole and the second light-transmitting hole are arranged concentrically;

[0005] The end of the first light-transmitting hole close to the convex lens is a bell mouth, and the bell mouth faces the convex lens.

[0006] Preferably, the major diameter of the bell mouth is larger than the diameter of the convex lens, and the minor diameter of the bell mouth is smaller than the diameter of the convex lens.

[0007] Preferably, the angle between the wall surface of the bell mouth and the horizontal plane is 55° to 65°.

[0008] Preferably, the connecting ring comprises an annular base and a plurality of connecting bosses, the plurality of connecting bosses are spaced apart along the inner ring of the annular base, each connecting position is distributed between every two connecting bosses, and the second connecting portion is provided on the connecting boss;

[0009] The inner wall of the connecting boss is inclined so that the inner walls of the plurality of connecting bosses form the bell mouth.

[0010] Preferably, two connecting positions that are opposite to each other are located at the same radial position, and two adjacent connecting positions are located at different radial positions.

[0011] Preferably, the inner wall surface of the annular base is a straight surface.

[0012] Preferably, the connection position is a countersunk hole.

[0013] Preferably, the first connection portion is an internal thread, and the second connection portion is an external thread.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The port of the first light-transmitting hole close to the convex lens is formed into a trumpet mouth, and the trumpet mouth faces the convex lens. In this way, when the light passes through the inner circle of the annular light source and enters the second light-transmitting hole, the light can basically be directly reflected into the industrial camera through the wall of the trumpet mouth, which reduces the reflection path and can reduce the attenuation in the reflection process, which is beneficial to improve the brightness of the light source and the image brightness, thereby improving the image difference at the detection position and ultimately improving the detection effect.

[0016] In practice, the annular light source can generally use an existing structure. In order to reduce the propagation path of light, the distance between the convex lens and the annular light source should be as small as possible. Therefore, the present application directly connects and fixes the connecting ring to the industrial camera. Furthermore, the first light-transmitting hole is shaped like a trumpet. When the connecting ring is connected to the industrial camera, the trumpet can avoid interference between the connecting ring and the protruding part of the convex lens, thereby ensuring connection reliability.

[0017] A connecting ring is provided, and a plurality of connecting positions are provided on the connecting ring, so that annular light sources of different specifications and sizes can be compatible.

[0018] The annular light source is connected to the industrial camera through a connecting ring, and the convex lens, the first light-transmitting hole and the second light-transmitting hole are concentrically arranged. In this way, when irradiating the welding point, the detection device is moved to make the annular light source concentric with the welding point. At this time, the welding point position can be sufficiently illuminated and the uniformity of light can be guaranteed, which is conducive to improving the detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the optical detection device for laser welding points in Example 1;

[0020] Figure 2 for Figure 1 Schematic diagram of the three-dimensional exploded structure of the optical inspection device for laser welding points;

[0021] Figure 3 for Figure 1 A cross-sectional view of an optical inspection device for laser welds;

[0022] Industrial camera 1; first connecting portion 11; convex lens 12;

[0023] Connecting ring 2; first light-transmitting hole 21; annular base 22; connecting position 221; connecting boss 23; second connecting portion 231;

[0024] Ring light source 3; light emitting surface 31; second light transmission hole 32. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] A laser welding spot optical detection device, see Figure 1-Figure 3 , including an industrial camera 1, a connecting ring 2 and an annular light source 3, the end of the industrial camera 1 has a convex lens, and a first connecting portion 11 is provided on the inner side wall thereof at a position outside the convex lens 12, a first light-transmitting hole 21 is provided in the connecting ring 2 that runs through both ends thereof, a second connecting portion 231 is provided at one end of the connecting ring 2, the second connecting portion 231 cooperates with the first connecting portion 11, preferably the first connecting portion 11 is an internal thread, and the second connecting portion 231 is an external thread, and the two are threadedly connected to connect the connecting ring 2 to the industrial camera 1, a plurality of groups of connecting positions 221 are provided at the other end of the connecting ring 2, and the annular light source 3 is connected to the corresponding groups of connecting positions 221, a light-emitting surface 31 and a second light-transmitting hole 32 are provided on the annular light source 3, the light-emitting surface 31 is located at its end face away from the industrial camera 1, and the convex lens, the first light-transmitting hole 21 and the second light-transmitting hole 32 are arranged concentrically. The end of the first light-transmitting hole 21 close to the convex lens is a bell mouth, and the bell mouth faces the convex lens. In the above, the port of the first light-transmitting hole 21 close to the convex lens is made into a trumpet mouth, and the trumpet mouth faces the convex lens. In this way, when the light passes through the inner circle of the annular light source 3 and enters the second light-transmitting hole 32, the light can be directly reflected into the industrial camera 1 through the wall surface of the trumpet mouth, which reduces the reflection path, can reduce the attenuation during the reflection process, is conducive to improving the brightness of the light source and the image brightness, thereby improving the image difference at the detection position, and finally improving the detection effect. In practice, the annular light source 3 can generally use the existing structure. In order to reduce the propagation path of the light, the smaller the distance between the convex lens and the annular light source 3, the better. Therefore, the present application directly connects and fixes the connecting ring 2 to the industrial camera 1. Further, the first light-transmitting hole 21 is made into a trumpet mouth shape. When the connecting ring 2 is connected to the industrial camera 1, the trumpet mouth can avoid interference between the connecting ring 2 and the protruding part of the convex lens, and ensure the connection reliability. A connecting ring 2 is provided, and multiple groups of connecting positions 221 are provided on the connecting ring 2, so that it can be compatible with ring light sources 3 of different specifications and sizes. The annular light source 3 is connected to the industrial camera 1 through the connecting ring 2, and the convex lens, the first light-transmitting hole 21 and the second light-transmitting hole 32 are concentrically arranged. In this way, when irradiating the welding point, the detection device is moved to make the annular light source 3 concentric with the welding point. At this time, the welding point position can be sufficiently irradiated and the uniformity of light can be guaranteed, which is conducive to improving the detection effect.

[0027] In this embodiment, the large diameter of the bell mouth is larger than the diameter of the convex lens, which can avoid interference between the connecting ring 2 and the convex lens; since the size of the welding point to be detected is small, the inner diameter of the annular light source 3 does not need to be set larger, so the small diameter of the bell mouth is smaller than the diameter of the convex lens, which can further reduce the reflection path of the light and reduce the attenuation during the reflection process, which is beneficial to improve the brightness of the light source and the image brightness, thereby improving the image difference at the detection position and ultimately improving the detection effect.

[0028] In this embodiment, the angle between the wall of the bell mouth and the horizontal plane is 55° to 65°, which allows the light reflected from the wall of the bell mouth to be directly reflected to the industrial camera 1 without further reflection, thereby reducing the reflection path, which is beneficial to improving the detection effect and avoiding the problem that the light needs to be reflected multiple times in the bell mouth due to an angle that is too large or too small, causing the light to attenuate and reduce the detection effect.

[0029] In this embodiment, the connecting ring 2 includes an integral annular base 22 and a plurality of connecting bosses 23. Specifically, there are four connecting bosses 23. The four connecting bosses 23 are spaced apart along the inner ring of the annular base 22, and each connecting position 221 is distributed between every two connecting bosses 23. The above four spaced apart connecting bosses 23 can not only realize the connection between the connecting ring 2 and the industrial camera 1, but also there is a gap between two adjacent connecting rings 2, and the external light can enter the connecting ring 2 through the gap and then be reflected into the industrial camera 1, thereby improving the brightness. In this way, the exposure compensation of the camera is low, the image taking efficiency is high, and it is conducive to improving the detection efficiency; the spaced apart connecting bosses 23 can also reduce the mass of the connecting ring 2, thereby reducing the weight of the device. The connecting boss 23 is provided with the above-mentioned second connecting portion 231, and the inner wall of the connecting boss 23 is inclined so that the inner walls of the plurality of connecting bosses 23 form the bell mouth.

[0030] The two connecting positions 221 that are opposite to each other are located at the same radial position, so as to connect the annular light sources 3 of the same specifications. In this embodiment, the structure that matches the connecting position 221 on the annular light source 3 is two threaded holes. The connecting position 221 is a through hole for a bolt to pass through, and the two connecting positions 221 just match the connecting holes. Two adjacent connecting positions 221 are located at different radial positions, so that the annular light sources 3 of different specifications can be compatible.

[0031] Among them, the connecting position 221 is further a countersunk hole. After the screw passes through the countersunk hole to connect the annular light source 3, the connecting ring 2 is threadedly connected to the industrial camera 1 through the connecting boss 23. After installation, the screw head is supported by the bottom surface of the industrial camera 1. In this way, the connecting ring 2 and the industrial camera 1 and the annular light source 3 can be fastened to each other, which improves the connection reliability and can also trap the head of the bolt in the hole to prevent the bolt from blocking the light, affecting the exposure compensation and reducing the detection efficiency.

[0032] The inner wall surface of the annular base 22 is a straight surface, which enables the upper surface of the annular base 22 to have sufficient positions for arranging connection positions 221 with different radial positions to be compatible with annular light sources 3 of different specifications.

[0033] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A laser welding spot optical detection device, characterized in that: It comprises an industrial camera, a connecting ring and an annular light source, wherein the end of the industrial camera has a convex lens, and a first connecting portion is provided on the inner side wall thereof at a position outside the convex lens, a first light-transmitting hole is provided in the connecting ring and passes through both ends thereof, a second connecting portion is provided at one end of the connecting ring, the second connecting portion cooperates with the first connecting portion, a plurality of connecting positions are provided at the other end of the connecting ring, the annular light source is connected to the corresponding groups of connecting positions, a light-emitting surface and a second light-transmitting hole are provided on the annular light source, the light-emitting surface is located at the end face thereof away from the industrial camera, and the convex lens, the first light-transmitting hole and the second light-transmitting hole are arranged concentrically; The end of the first light-transmitting hole close to the convex lens is a bell mouth, and the bell mouth faces the convex lens.

2. The laser welding spot optical detection device according to claim 1, characterized in that: The major diameter of the bell mouth is larger than the diameter of the convex lens, and the minor diameter of the bell mouth is smaller than the diameter of the convex lens.

3. The laser welding spot optical detection device according to claim 1, characterized in that: The angle between the wall surface of the bell mouth and the horizontal plane is 55° to 65°.

4. The laser welding spot optical detection device according to claim 1, characterized in that: The connecting ring comprises an annular base and a plurality of connecting bosses, wherein the plurality of connecting bosses are spaced apart along the inner ring of the annular base, each connecting position is distributed between every two connecting bosses, and the second connecting portion is disposed on the connecting boss; The inner wall of the connecting boss is inclined so that the inner walls of the plurality of connecting bosses form the bell mouth.

5. The laser welding spot optical detection device according to claim 4, characterized in that: The two connecting positions that are opposite to each other are located at the same radial position, and the two adjacent connecting positions are located at different radial positions.

6. The laser welding spot optical detection device according to claim 5, characterized in that: The inner wall surface of the annular base is a straight surface.

7. The laser welding spot optical detection device according to claim 4, characterized in that: The connection position is a countersunk hole.

8. The laser welding spot optical detection device according to any one of claims 1 to 6, characterized in that: The first connection portion is an internal thread, and the second connection portion is an external thread.

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