Vision-based welding defect detection equipment

Abstract

The utility model relates to welding defect detection equipment based on vision. The equipment mainly comprises a conveyor belt, a label reader, an L-shaped bracket, an x-y-z direction displacement adjusting component, an industrial camera and a computer terminal, the conveying belt conveys a welded metal plate, the label reader reads a two-dimensional code label of the plate and then transmits product information to the computer terminal, the industrial camera achieves position adjustment in the x, y and z directions through the displacement adjusting assembly, and the computer terminal determines the optimal shooting position according to the product information and controls the camera. Meanwhile, shot pictures are obtained for defect detection analysis, and a detection result and product information are stored in an associated mode. Compared with the prior art, the device can realize automatic and precise detection of welding defects of different metal plates, effectively improves the detection efficiency and accuracy, meets the requirement of strict control on welding quality in industrial production, and has wide application prospects.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of welding defect detection equipment, in particular to a kind of welding defect detection equipment based on vision. BACKGROUND

[0002] In modern industrial production, welding as a key connection process is widely used in the processing and manufacturing field of metal plate, such as automobile manufacturing, shipbuilding, steel structure engineering and other industries. However, due to the influence of various factors in the welding process, such as the fluctuation of welding process parameters, the quality difference of welding materials, the uneven skill level of operators and the change of welding environment, etc., various welding defects, such as pores, cracks, incomplete fusion, slag inclusion, etc. are inevitably produced. These welding defects seriously affect the quality and performance of the welded joint, and thus threaten the safety and reliability of the entire product.

[0003] In order to ensure the welding quality, welding defect detection has become an indispensable part of the production process. The traditional welding defect detection methods mainly include manual visual inspection, ultrasonic detection, X-ray detection, etc. Manual visual inspection relies on the experience and skill of the inspector, is highly subjective, has low detection efficiency, and long-time work can easily lead to visual fatigue, thus affecting the accuracy and reliability of the detection. Although ultrasonic detection and X-ray detection can detect internal defects to some extent, they are complex to operate, require professional technicians to operate, the detection equipment is expensive, and the detection process may cause certain harm to the human body, and it is also difficult to realize rapid and real-time detection of welding defects.

[0004] With the rapid development of computer technology and machine vision technology, welding defect detection methods based on vision have gradually attracted attention and been applied. This method uses industrial cameras to shoot images of the welding area, and then analyzes and processes the images by computer to identify welding defects. However, the existing welding defect detection equipment based on vision has some limitations. In the shooting process, most of the equipment uses fixed-position industrial cameras, or can only be adjusted manually, and cannot flexibly adjust the shooting position and angle according to the characteristics of different products and the differences of welding positions, which makes it difficult to obtain clear and accurate images of the welding area, thus affecting the accuracy and reliability of the defect detection. In addition, in the detection process, for a large number of welding products of different batches and different specifications, there is no effective means to accurately associate and manage product information with detection data, which is not conducive to subsequent quality traceability and production process improvement.

[0005] Therefore, there is an urgent need for a new welding defect detection equipment based on vision to solve the above problems, in order to improve the accuracy and efficiency of welding defect detection and meet the needs of modern industrial production for strict control of welding quality. UTILITY MODEL CONTENT

[0006] The welding defect detection equipment based on vision can realize automatic and accurate detection of welding defects of different metal plates, effectively improve detection efficiency and accuracy, meet the demand of strict control of welding quality in industrial production, and has wide application prospect.

[0007] The purpose of the utility model can be realized through the following technical schemes:

[0008] The utility model provides a kind of welding defect detection equipment based on vision, including conveyer belt, label reader, L type support, x-y-z direction displacement adjusting assembly, industrial camera, computer terminal, and specifically:

[0009] Conveyer belt is used to transport the metal plate after welding to be detected;

[0010] Label reader is arranged at the beginning of the conveyer belt, for reading the two-dimensional code label on the metal plate;

[0011] X-y-z direction displacement adjusting assembly is arranged on the crossbar of the L type support;

[0012] Industrial camera is arranged on the x-y-z direction displacement adjusting assembly, and the position of industrial camera relative to the surface of conveyer belt x, y, z three orthogonal directions is adjusted through the x-y-z direction displacement adjusting assembly, to realize the determination of the best shooting position;

[0013] Computer terminal is connected with label reader and industrial camera, and computer terminal is used to obtain the product information of metal plate read by label reader, while computer terminal is used to obtain the surface photo of metal plate shot by industrial camera, and defect detection is carried out based on the surface photo of metal plate.

[0014] Further, the two sides of the conveyer belt are provided with support rods for supporting the conveyer belt.

[0015] Further, the L type support includes a vertical rod connected with the ground and a crossbar connected to the top of the vertical rod, and the vertical rod is perpendicular to the crossbar.

[0016] Further, the x-y-z direction displacement adjusting assembly includes a horizontal screw rod and block assembly arranged on the crossbar, a vertical carrier plate arranged on the horizontal screw rod and block assembly, a vertical screw rod and block assembly arranged on the vertical carrier plate, and a connecting rod arranged on the vertical screw rod and block assembly, and the industrial camera is arranged on the connecting rod.

[0017] Further, a horizontal sliding groove is arranged on the crossbar along the length direction.

[0018] Further, the transverse screw-sliding block assembly comprises a first servo motor arranged on the transverse rod, a transverse screw rod arranged in the transverse sliding groove and connected with the output end of the first servo motor, and a first sliding block threadedly matched with the transverse screw rod, which can be displaced along the transverse sliding groove under the drive of the first servo motor.

[0019] Further, the vertical load plate is connected with the first sliding block.

[0020] The vertical load plate is provided with a vertical sliding groove.

[0021] Further, the vertical screw-sliding block assembly comprises a second servo motor arranged on the vertical load plate, a vertical screw rod arranged in the vertical sliding groove and connected with the output end of the second servo motor, and a second sliding block threadedly matched with the vertical screw rod, which can be displaced along the vertical sliding groove under the drive of the second servo motor.

[0022] Further, the connecting rod is connected with the second sliding block, and the industrial camera is arranged at the lower end of the connecting rod.

[0023] Further, the first servo motor and the second servo motor are both in communication connection with the computer terminal.

[0024] Compared with the prior art, the welding defect detection device has the following beneficial effects:

[0025] 1) The conventional welding defect detection device often adopts fixed position or general shooting setting, and it is difficult to realize individualized optimal shooting angle and position acquisition for different products. However, the utility model reads the two-dimensional code label on the metal plate through the label reader arranged at the beginning of the conveying belt, the computer terminal obtains the corresponding product information, each product information corresponds to an optimal shooting position, and the shooting position of the industrial camera is precisely adjusted by using the computer terminal instruction x-y-z direction displacement adjusting assembly, so that the problem of unable to perform targeted and accurate shooting according to different product characteristics is solved, thereby the accurate image information of each product surface can be better captured for subsequent defect detection, and the effectiveness and accuracy of detection are improved.

[0026] 2) In the case of a large number of welding products, how to accurately know the detection situation corresponding to each product and facilitate subsequent quality traceability is a big difficulty. The utility model obtains product information by means of label reader reading two-dimensional code label, and the computer terminal matches the information with the defect detection result obtained based on the corresponding best shooting position shooting and analysis, avoids the mismatch and confusion of detection result and specific product, effectively solves the problem of inaccurate information and difficult to correspond to specific product individual in product quality traceability process, and facilitates enterprises to accurately master the quality status of each welding product and make corresponding production improvement and other decisions.

[0027] 3) The previous adjustment of industrial camera position may depend on manual experience and manual operation, which is not only low in efficiency but also difficult to ensure accurate best shooting position every time. The utility model utilizes the collaborative communication work among the computer terminal, label reader and x-y-z direction displacement adjustment assembly, automatically determines and instructs the position of the industrial camera according to product information, realizes the automation and intelligentization of shooting position adjustment, overcomes the problems of insufficient precision, complicated operation and inability to quickly respond to different product shooting requirements in the manual adjustment mode, and improves the automation level and detection efficiency of the whole welding defect detection process. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 and 2 It is a structural schematic view of a welding defect detection equipment based on vision.

[0029] In the figure: 1, conveying belt, 2, label reader, 3, metal plate, 4, L-shaped support, 5, industrial camera, 6, computer terminal, 7, support rod, 8, vertical carrier plate, 9, first servo motor, 10, second servo motor, 11, connecting rod. DETAILED DESCRIPTION

[0030] The utility model will be described in detail below in combination with the drawings and specific embodiments. In the technical scheme, if the component model, material name, connection structure, control method, algorithm and other features are not explicitly stated, they are regarded as common technical features disclosed in the prior art.

[0031] Embodiment 1

[0032] The embodiment provides a welding defect detection equipment based on vision, which comprises a conveying belt 1, a label reader 2, an L-shaped support 4, an x-y-z direction displacement adjustment assembly, an industrial camera 5 and a computer terminal 6, wherein specifically referring to Figure 1 and Figure 2 .

[0033] The conveying belt 1 is used to convey the welded metal plate 3 to be detected. The conveying belt 1 is a conventional industrial electric conveying belt. The belt body is made of rubber or metal material. The surface of the belt body has a certain friction force, which is used to carry and convey the welded metal plate 3 to be detected. The belt body is driven by a motor to realize uniform motion, so as to ensure that the metal plate can pass through the detection area in sequence. The running speed can be adjusted according to the actual detection requirement. The conveying belt 1 plays a basic role in material transmission in the whole detection equipment. The conveying belt 1 is provided with support rods 7 on both sides for supporting the conveying belt 1.

[0034] The label reader 2 is arranged at the starting end of the conveying belt 1 and is used to read the two-dimensional code label on the metal plate 3. The label reader 2 is a photoelectric or laser code scanning device. The label reader 2 is installed above the starting end of the conveying belt 1 at a suitable height from the surface of the conveying belt 1. The label reader 2 can quickly and accurately read the two-dimensional code label information pasted on the metal plate 3. The product information read by the label reader 2 is transmitted to the computer terminal 6 in the form of an electric signal. The label reader 2 provides key identification data for subsequent targeted detection operation according to product characteristics, so as to realize accurate association of product information and detection process.

[0035] The L-shaped support 4 is usually made of metal material and is welded or assembled. The L-shaped support 4 includes a vertical rod connected perpendicularly to the ground and a horizontal rod connected perpendicularly to the top of the vertical rod. The vertical rod provides stable support for the whole support. The horizontal rod is used to install the x-y-z direction displacement adjusting assembly. The structure design of the L-shaped support 4 ensures that the industrial camera 5 can stably be above the appropriate detection position during the detection process and has sufficient strength and rigidity. The L-shaped support 4 includes a vertical rod connected to the ground and a horizontal rod connected to the top of the vertical rod. The vertical rod is perpendicular to the horizontal rod.

[0036] The x-y-z direction displacement adjusting assembly is arranged on the horizontal rod of the L-shaped support 4. The x-y-z direction displacement adjusting assembly includes a horizontal screw rod and sliding block assembly arranged on the horizontal rod, a vertical carrier plate 8 arranged on the horizontal screw rod and sliding block assembly, a vertical screw rod and sliding block assembly arranged on the vertical carrier plate 8, and a connecting rod 11 arranged on the vertical screw rod and sliding block assembly. The industrial camera 5 is arranged on the connecting rod 11.

[0037] The industrial camera 5 is arranged on the x-y-z direction displacement adjusting assembly. The x-y-z direction displacement adjusting assembly is used to adjust the position of the industrial camera 5 relative to the surface of the conveying belt 1 in the x, y and z orthogonal directions, so as to determine the best shooting position.

[0038] The computer terminal 6 is in communication connection with the label reader 2 and the industrial camera 5, and is used to acquire product information of the metal plate 3 read by the label reader 2, and is used to acquire a surface photo of the metal plate 3 shot by the industrial camera 5, and to perform defect detection based on the surface photo of the metal plate 3. The computer terminal 6 can be a commercially purchased industrial control computer, and is internally provided with conventional image processing software and a database, and the specific software level is prior art and is not the innovation point of the utility model, and will not be described in detail. The computer terminal 6 receives product information transmitted by the label reader 2 on one hand, and receives a surface photo of the metal plate 3 shot by the industrial camera 5 on the other hand, analyzes and processes the image, uses existing image processing algorithms to identify welding defects, and stores the detection result in association with the product information. Meanwhile, according to a preset corresponding relationship between product information and the best shooting position, a control instruction is sent to the x-y-z direction displacement adjusting assembly to realize automatic and accurate adjustment of the shooting position of the industrial camera 5, and the computer terminal 6 is the control core and data processing center of the entire detection equipment, coordinates the work between various components, completes the welding defect detection task, and realizes management and tracing of detection data.

[0039] The horizontal rod is provided with a horizontal sliding groove in the length direction. The horizontal screw rod and sliding block assembly comprises a first servo motor 9 arranged on the horizontal rod, a horizontal screw rod arranged in the horizontal sliding groove and connected with the output end of the first servo motor 9, and a first sliding block threadedly matched with the horizontal screw rod, which can be displaced along the horizontal sliding groove under the drive of the first servo motor 9.

[0040] The first servo motor 9 serves as the power source of the horizontal screw rod and sliding block assembly, is connected with the computer terminal 6 through a control circuit, receives the control signal sent by the computer terminal 6, and drives the horizontal screw rod to rotate, thereby driving the first sliding block to move in the horizontal sliding groove of the horizontal rod. The second servo motor 10 is arranged on the vertical loading plate 8 and is used to drive the vertical screw rod in the vertical screw rod and sliding block assembly to rotate, is in communication connection with the computer terminal 6, and controls the second sliding block to move up and down in the vertical sliding groove of the vertical loading plate 8 according to the instruction of the computer terminal 6.

[0041] The vertical loading plate 8 is connected with the first sliding block, and is provided with a vertical sliding groove. The vertical screw rod and sliding block assembly comprises a second servo motor 10 arranged on the vertical loading plate 8, a vertical screw rod arranged in the vertical sliding groove and connected with the output end of the second servo motor 10, and a second sliding block threadedly matched with the vertical screw rod, which can be displaced along the vertical sliding groove under the drive of the second servo motor 10.

[0042] The connecting rod 11 is connected with the second slider, and the industrial camera 5 is arranged at the lower end of the connecting rod 11. The first servo motor 9 and the second servo motor 10 are both in communication connection with the computer terminal 6. The connecting rod 11 is usually a rod-shaped structure made of metal, one end of which is connected with the second slider of the vertical screw rod slider assembly, and the other end is used for mounting the industrial camera 5. The length and shape of the connecting rod 11 are designed according to the mounting requirements and detection range of the industrial camera 5. The main function of the connecting rod 11 is to fix the industrial camera 5 at a suitable position and connect the industrial camera 5 with the vertical screw rod slider assembly, so as to ensure that the industrial camera 5 can be adjusted in the vertical direction with the movement of the second slider.

[0043] The conventional welding defect detection equipment usually adopts fixed position or general shooting setting, and it is difficult to realize personalized optimal shooting angle and position acquisition for different products. The utility model solves the problem that targeted and accurate shooting cannot be realized according to different product characteristics by setting the label reader 2 at the beginning of the conveying belt 1 to read the two-dimensional code label on the metal plate 3, the computer terminal 6 acquires corresponding product information, each product information corresponds to an optimal shooting position, and the shooting position of the industrial camera 5 is accurately adjusted by using the x-y-z direction displacement adjusting assembly of the computer terminal 6, so that accurate image information of each product surface can be better captured for subsequent defect detection, and the effectiveness and accuracy of detection are improved.

[0044] The above description of the embodiments is for facilitating the ordinary skilled person in the art to understand and use the utility model. The person skilled in the art can obviously easily make various modifications to the embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the utility model is not limited to the above embodiments, and the improvements and modifications made by the person skilled in the art without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A vision-based welding defect detection apparatus, characterized by, The application relates to a label reading and defect detecting device for a welded metal plate, which comprises the following parts: a conveying belt (1) for conveying a welded metal plate (3) to be detected; a label reader (2) arranged at the starting end of the conveying belt (1) and used for reading a two-dimensional code label on the metal plate (3); an L-shaped support (4); an x-y-z direction displacement adjusting assembly arranged on the horizontal rod of the L-shaped support (4); an industrial camera (5) arranged on the x-y-z direction displacement adjusting assembly and used for adjusting the position of the industrial camera (5) relative to the surface of the conveying belt (1) in the x, y and z three orthogonal directions to determine the best shooting position; a computer terminal (6) in communication connection with the label reader (2) and the industrial camera (5), which is used for acquiring the product information of the metal plate (3) read by the label reader (2) and acquiring the surface photo of the metal plate (3) shot by the industrial camera (5) and carrying out defect detection based on the surface photo of the metal plate (3).

2. The vision-based welding defect detection apparatus of claim 1, wherein Support rods (7) are arranged on the two sides of the conveying belt (1) and used for supporting the conveying belt (1).

3. The vision-based welding defect detection apparatus of claim 1, wherein The L-shaped support (4) comprises a vertical rod connected with the ground and a horizontal rod connected with the top of the vertical rod, and the vertical rod is perpendicular to the horizontal rod.

4. The vision-based weld defect detection apparatus of claim 3, wherein, The x-y-z direction displacement adjusting assembly comprises a horizontal screw rod and sliding block assembly arranged on the horizontal rod, a vertical carrier plate (8) arranged on the horizontal screw rod and sliding block assembly, a vertical screw rod and sliding block assembly arranged on the vertical carrier plate (8) and a connecting rod (11) arranged on the vertical screw rod and sliding block assembly, and the industrial camera (5) is arranged on the connecting rod (11).

5. The vision-based weld defect detection apparatus of claim 4, wherein, A horizontal sliding groove is arranged on the horizontal rod along the length direction.

6. The vision-based weld defect detection apparatus of claim 5, wherein, The horizontal screw rod and sliding block assembly comprises a first servo motor (9) arranged on the horizontal rod, a horizontal screw rod connected with the output end of the first servo motor (9) and arranged in the horizontal sliding groove and a first sliding block matched with the horizontal screw rod in the screw thread, and the first sliding block can be displaced along the horizontal sliding groove under the drive of the first servo motor (9).

7. The vision-based weld defect detection apparatus of claim 6, wherein, The vertical carrier plate (8) is connected with the first sliding block. A vertical sliding groove is arranged on the vertical carrier plate (8).

8. The vision-based weld defect detection apparatus of claim 7, wherein, The vertical screw rod and sliding block assembly comprises a second servo motor (10) arranged on the vertical carrier plate (8), a vertical screw rod connected with the output end of the second servo motor (10) and arranged in the vertical sliding groove and a second sliding block matched with the vertical screw rod in the screw thread, and the second sliding block can be displaced along the vertical sliding groove under the drive of the second servo motor (10).

9. The vision-based weld defect detection apparatus of claim 8, wherein, The connecting rod (11) is connected with the second sliding block, and the industrial camera (5) is arranged at the lower end of the connecting rod (11).

10. The vision-based weld defect detection apparatus of claim 8, wherein, The first servo motor (9) and the second servo motor (10) are in communication connection with the computer terminal (6).

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