A rapid detection device for brazing defects in radiators

Abstract

This invention relates to the field of radiator technology and discloses a rapid detection device for brazing defects in radiators. The device includes: a positioning fixture, a machine structure, a vision camera, a detection and adjustment mechanism, and a marking mechanism. It uses a high-speed, high-precision vision camera, employing an upper light source to illuminate and inspect for light leaks, and a side light source to illuminate from the side to identify black spots at the weld joint. A closed-loop process is employed, featuring two symmetrical, two-degree-of-freedom adjustments, division of labor between the upper and side light sources, light shielding and anti-interference, and orthogonal marking by a dual-marking mechanism with defect coordinate mapping, to rapidly detect brazing defects. Marking is performed on the non-welding area of ​​the radiator to be inspected to identify the defect location, facilitating repair welding of products with appearance defects. The device improves detection accuracy, stability, and precision, reduces inspection costs, and decreases the number of appearance defects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat sinks, in particular to a rapid detection device for brazing defects of heat sinks. BACKGROUND

[0002] Currently, the aluminum core of the heat sink is connected together by using molten filler metal through a continuous nitrogen-protected aluminum brazing furnace. When melting, the filler metal spreads between the closely combined surfaces to fill the joint gap; after cooling, a metallurgical binder is formed, and the melting point of the filler metal is above 450℃, but lower than the melting point of the base material. Thus, the matching positions between all parts (for example, the heat dissipation band and the heat dissipation pipe, and the hole position of the heat dissipation pipe and the main plate) are firmly welded, so that the cooling liquid flows in the heat sink without leakage. This process is commonly known as brazing.

[0003] Visual detection technology is an automated detection technology based on machine vision, which simulates human visual function through the use of optical equipment and computer algorithms to quickly and accurately detect and analyze the detected object. This technology has the advantages of non-contact, high precision, high speed, good stability, etc., and its system composition includes image acquisition, image processing, defect recognition and judgment, and has been widely used in industrial production, medical imaging, security monitoring, intelligent transportation and other fields. In industrial production, it can be used for product quality detection, size measurement, appearance defect recognition, etc.

[0004] In the brazing process, because there are many welding positions, it is very time-consuming and tedious to check whether the welding position meets the requirements (whether the weld is full? Is the welding fully covered? Is there a sand eye?). Especially, the welding effect of the key parts directly affects whether the whole heat sink is scrapped or not. The existing detection method is to check whether the light is transparent by the naked eye one by one to judge whether the welding meets the requirements. The unqualified parts are marked with a large pen, and then flame welding is used for repair welding.

[0005] Defects and deficiencies of the prior art:

[0006] 1. The human eye inspection requires a high level of employees, and the inspection accuracy is limited;

[0007] 2. And the missed detection rate will greatly increase after a long time of work,

[0008] 3. And the inspection area is too large, and a heat sink core needs to be turned over twice to complete the detection;

[0009] 4. And in the process of turning over, it is easy to cause appearance defects of the core, such as scratches on the heat dissipation pipe and the heat dissipation band (both of these two components are very thin, basically 0.26±0.1mm);

[0010] 5. The efficiency of the inspection is also very low, and it takes about 48 seconds to manually inspect one radiator core. SUMMARY

[0011] The purpose of the present application is to solve the problems existing in the prior art and provide a radiator brazing defect rapid detection device.

[0012] In order to achieve the above purpose, the present application adopts the following technical scheme: a radiator brazing defect rapid detection device, comprising:

[0013] The positioning tool provides support and limiting for the radiator to be detected;

[0014] The body structure has a detection platform, and an upper light source is hung on the detection platform through a support, and the outer side of the support is a protective shell, a transmission rail is fixedly installed on the detection platform, the positioning tool slides into the body structure along the upper surface of the transmission rail, and a positioning sensor for detecting the positioning tool is installed on the detection platform;

[0015] The visual camera collects images of the welding surface of the radiator to be detected;

[0016] The detection adjusting mechanism has two sets, and the two sets of detection adjusting mechanisms are installed on the detection platform and symmetrically arranged on both sides of the transmission rail, the detection adjusting mechanism has a driving module and a mounting plate, the mounting plate is driven by the driving module to translate upward and / or horizontally, the visual camera is fixedly installed on the mounting plate, two light shields are fixedly installed on the surface of the mounting plate, and a side light source is fixedly installed on the side of each light shield close to the radiator to be detected. The visual camera is used to collect images and realize visual detection of the leakage and black spots of the welding area;

[0017] The marking mechanism has two sets, one set of marking mechanism is arranged in parallel with the transmission rail and is fixedly installed on the inner side surface of any light shield, and the other set of marking mechanism is vertically arranged and fixed between the two light shields. The marking mechanism is used for marking the non-welding area of the radiator to be detected to identify the defect position.

[0018] Preferably, the driving module comprises a horizontal moving assembly, the horizontal moving assembly comprises a horizontal sliding rail and a first hydraulic cylinder, the horizontal sliding rail and the first hydraulic cylinder are fixedly installed on the upper surface of the detection platform, a moving seat is slidingly installed on the surface of the horizontal sliding rail, and the moving seat is driven by the first hydraulic cylinder to move close to or away from the transmission rail;

[0019] The driving module further comprises an up-down moving assembly, the up-down moving assembly comprises a vertical sliding rail and a second hydraulic cylinder, the mounting plate is slidingly installed on the vertical sliding rail, the second hydraulic cylinder is fixed on the moving seat, and the mounting plate is driven by the second hydraulic cylinder to translate upward and downward.

[0020] Preferably, the marking mechanism comprises a long strip-shaped base plate, two synchronous wheels are rotatably installed inside the base plate, a transmission belt is sleeved between the two synchronous wheels, the surface of the transmission belt is provided with a marking protrusion, the side of the transmission belt close to the conveying guide extends to the outside of the base plate, a servo motor is fixedly installed on the surface of the base plate, any synchronous wheel is driven to rotate through the servo motor, and an ink cartridge is screwedly installed on the surface of the base plate.

[0021] Preferably, the inside of the ink cartridge is provided with a sponge body soaked with ink, a roller seat is slidably installed inside the base plate, an intermediate roller is rotatably installed on the roller seat, a return spring is arranged inside the base plate and abuts against the roller seat, the intermediate roller is arranged at a position between the sponge body and the transmission belt, the sponge body is in surface contact with the intermediate roller, under the abutting action of the return spring, the intermediate roller moves close to the transmission belt, and the intermediate roller and the transmission belt are in a non-contact state, and when the transmission belt operates, the marking protrusion can be in contact with the intermediate roller to ink the marking protrusion.

[0022] Preferably, in the two sets of marking mechanisms, the marking protrusion in one set of marking mechanisms is a first protrusion, and the marking protrusion in the other set of marking mechanisms is a second protrusion.

[0023] The soldered side surface of the radiator to be detected is pasted with marking paper, when the mounting plate approaches the radiator to be detected, the first protrusion contacts the marking paper to leave a first correction line on the marking paper, the second protrusion contacts the marking paper to leave a second correction line on the marking paper, the first correction line and the second correction line are perpendicular to each other, and the intersection of the extension lines of the first correction line and the second correction line corresponds to the defect position, so that the defect position of the radiator is marked.

[0024] The present application has the following beneficial effects:

[0025] 1. The detection device provided by the present application uses a high-speed and high-precision visual camera, illuminates through an upper light source, detects light leakage points, illuminates from the side through a side light source, identifies black spots at the welding position, provides convenience for products with appearance defects to be re-welded, and has detection accuracy and stability: visual detection can continuously and stably judge without being affected by working time, employee mentality and working intensity; detection accuracy is improved: detection accuracy: leakage hole ≥0.7mm; detection efficiency is improved: from originally 48 seconds per unit to 7 seconds per unit; detection cost is reduced: from originally 5 people to 1 person; appearance defects are reduced: the carrying and turning actions of the core body in the detection process are reduced, and appearance defects caused by scratching are reduced.

[0026] 2. The detection device proposed in this invention has two sets of marking mechanisms on the detection adjustment mechanism. By utilizing the vertical and horizontal translation functions of the detection adjustment mechanism, the marking protrusions in the marking mechanism come into contact with the marking paper on the surface of the heat sink to be tested, leaving a first correction line and a second correction line on the marking paper. The intersection point of the extensions of the first correction line and the second correction line is the location of the welding defect, thus achieving the effect of marking the location of the defect in the heat sink. Moreover, the first correction line and the second correction line do not directly cover the defect location, which is convenient for maintenance personnel to view and review, and provides convenience for subsequent repair welding and rework.

[0027] 3. The detection device proposed in this invention marks a first correction line and a second correction line on the marking paper on the surface of the heat sink to be tested. During the repair welding process, the first correction line and the second correction line are aligned with two reference lines on the repair welding platform, so that the defect position of the heat sink can fall exactly at the operation window, which facilitates the secondary positioning of the repair welding and greatly improves the repair welding efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal structure of the detection device proposed in this invention;

[0029] Figure 2 This is a schematic diagram of the overall structure of the detection device proposed in this invention;

[0030] Figure 3 This is a three-dimensional structural diagram of the driving module proposed in this invention;

[0031] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the diagram;

[0032] Figure 5 This is a three-dimensional structural diagram of the marking mechanism proposed in this invention;

[0033] Figure 6 for Figure 5 A top-section diagram of the horizontally arranged marking mechanism;

[0034] Figure 7 This is a front view schematic diagram of the two drive modules;

[0035] Figure 8 This is a partial structural diagram of the heat sink to be tested.

[0036] Figure 9 A rendered schematic diagram of the heat sink under test, captured by a vision camera;

[0037] Figure 10 A schematic diagram of a black spot on a heatsink under test, captured by a vision camera.

[0038] In the diagram: 1. Positioning fixture; 2. Heat sink to be tested; 3. Testing platform; 4. Upper light source; 5. Transmission guide rail; 6. Vision camera; 7. Drive module; 8. Mounting plate; 9. Light shield; 10. Side light source; 11. Horizontal moving assembly; 12. Horizontal slide rail; 13. First hydraulic electric cylinder; 14. Moving seat; 15. Up and down moving assembly; 16. Vertical slide rail; 17. Second hydraulic electric cylinder; 18. Marking mechanism; 19. Base plate; 20. Synchronous pulley; 21. Transmission belt; 22. Marking protrusion; 23. Servo motor; 24. Ink cartridge; 25. Sponge; 26. Roller seat; 27. Intermediate roller; 28. Return spring; 29. ​​First protrusion; 30. Second protrusion; 31. Marking paper; 32. First calibration line; 33. Second calibration line; 34. Welding platform; 35. Baseline; 36. Operation window. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Reference Figures 1-10 A rapid detection device for brazing defects in radiators, comprising:

[0042] Positioning fixture 1 provides support and limits for the heat sink 2 to be tested;

[0043] The machine structure includes a detection platform 3, on which an upper light source 4 is suspended by a bracket. The outer side of the bracket is a protective shell. A transmission guide rail 5 is fixedly installed on the detection platform 3. The transmission guide rail 5 is used in combination with a double-speed chain conveyor. The heat sink 2 to be tested is installed on a positioning fixture 1. The positioning fixture 1 is placed on the double-speed chain conveyor and transported to the transmission guide rail 5 by the double-speed chain conveyor. The positioning fixture 1 slides along the upper surface of the transmission guide rail 5 into the machine structure. A positioning sensor for detecting the positioning fixture 1 is installed on the detection platform 3. The positioning sensor detects whether the positioning fixture 1 has reached the preset detection position.

[0044] The vision camera 6 acquires images of the welding surface of the heat sink 2 to be inspected;

[0045] The detection and adjustment mechanism has two sets, see reference. Figure 1Two sets of detection and adjustment mechanisms are installed on the detection platform 3 and symmetrically arranged on both sides of the transmission guide rail 5. Each detection and adjustment mechanism has a drive module 7 and a mounting plate 8. The drive module 7 drives the mounting plate 8 to move vertically and / or horizontally. The vision camera 6 is fixedly installed on the mounting plate 8. Two light-shielding plates 9 are fixedly installed on the surface of the mounting plate 8. A side light source 10 is fixedly installed on the side of each light-shielding plate 9 closest to the heat sink 2 to be tested. (See details...) Figure 3 The light shield 9 reduces stray light interference with the detection of the visual camera 6.

[0046] In this embodiment, reference Figure 1 , Figure 3 The drive module 7 includes a horizontal moving component 11, which includes a horizontal slide rail 12 and a first hydraulic electric cylinder 13. The horizontal slide rail 12 and the first hydraulic electric cylinder 13 are both fixedly installed on the upper surface of the detection platform 3. A movable seat 14 is slidably installed on the surface of the horizontal slide rail 12. The movable seat 14 is driven by the first hydraulic electric cylinder 13 to move closer to or away from the transmission guide rail 5.

[0047] The drive module 7 includes a vertical moving component 15, which includes a vertical slide rail 16 and a second hydraulic electric cylinder 17. The mounting plate 8 is slidably mounted on the vertical slide rail 16, and the second hydraulic electric cylinder 17 is fixed on the moving seat 14. The mounting plate 8 is driven to move up and down by the second hydraulic electric cylinder 17.

[0048] During use, such as Figure 7 As shown, the distance and height difference between the vision camera 6 and the heat sink 2 under test are adjusted by the drive module 7, so that the two vision cameras 6 are aligned with the two sides of the heat sink 2 under test. The upper light source 4 is turned on to perform light leakage detection. If there is a gap at the weld, the image captured by the vision camera 6 will show obvious light leakage points through rendering. Light leakage detection: the upper light source 4 illuminates, and the weld gap causes abnormal brightness points. The vision camera 6 captures images and identifies them, such as... Figure 9 As shown;

[0049] Then, the side light source 10 is turned on to detect black spots at the weld joint. The image captured by the vision camera 6 is as follows: Figure 10 Black spot detection: Side light source 10 is incident at an angle, light shield 9 suppresses stray light, and surface contrast enhancement enables black spot recognition; The above images are analyzed by a computer vision inspection system, and products with light leakage and black spot defects are selected and stored separately for subsequent welding repair.

[0050] In this embodiment, as Figure 5As shown, the testing device also includes a marking mechanism 18. There are two sets of marking mechanisms 18. One set of marking mechanisms 18 is arranged parallel to the transmission guide rail 5 and fixedly installed on the inner surface of any light shield 9. The other set of marking mechanisms 18 is arranged vertically and fixed between the two light shield 9. The marking mechanism 18 is used to mark the non-welded area of ​​the heat sink 2 to be tested to identify the defect location.

[0051] refer to Figure 6 The marking mechanism 18 includes a long strip-shaped substrate 19. Two synchronous pulleys 20 are rotatably mounted inside the substrate 19. A transmission belt 21 is sleeved between the two synchronous pulleys 20. The surface of the transmission belt 21 is provided with marking protrusions 22. The transmission belt 21 extends to the outside of the substrate 19 from the side near the transmission guide rail 5. A servo motor 23 is fixedly mounted on the surface of the substrate 19. The servo motor 23 drives either synchronous pulley 20 to rotate. An ink cartridge 24 is threaded onto the surface of the substrate 19. The servo motor 23 drives the transmission belt 21 to rotate, and the marking protrusions 22 move with the transmission belt 21 to realize the position adjustment of the marking protrusions 22.

[0052] The ink cartridge 24 has an ink-soaked sponge 25 inside, a roller seat 26 is slidably mounted inside the substrate 19, an intermediate roller 27 is rotatably mounted on the roller seat 26, a return spring 28 is provided inside the substrate 19 to press against the roller seat 26, and the intermediate roller 27 is positioned between the sponge 25 and the transmission belt 21, with the surface of the sponge 25 in contact with the surface of the intermediate roller 27.

[0053] Under the pressure of the return spring 28, the intermediate roller 27 moves close to the transmission belt 21, and the intermediate roller 27 and the transmission belt 21 are in a non-contact state. When the transmission belt 21 is running, the marking protrusion 22 can contact the intermediate roller 27, so that the surface of the marking protrusion 22 is coated with ink. The intermediate roller 27 is normally not in contact with the transmission belt 21, and only contacts the marking protrusion 22 momentarily when it passes by, thus reducing pollution and ink consumption.

[0054] For details, please refer to Figure 4 Assume that in the two marking mechanisms 18, the marking protrusion 22 in one marking mechanism 18 is the first protrusion 29, and the marking protrusion 22 in the other marking mechanism 18 is the second protrusion 30.

[0055] refer to Figure 8 Marking paper 31 is pasted on the welded side surface of the heat sink 2 to be tested. When the mounting plate 8 approaches the heat sink 2 to be tested, the first protrusion 29 contacts the marking paper 31 and leaves a first correction line 32 on the marking paper 31. The second protrusion 30 contacts the marking paper 31 and leaves a second correction line 33 on the marking paper 31. The first correction line 32 and the second correction line 33 are perpendicular to each other, and the intersection of their extensions corresponds to the defect position.

[0056] It should be noted that this is for reference only. Figure 8 In the XYZ coordinate system, when the computer vision inspection system analyzes the image acquired by the vision camera 6, if there are defects such as light leakage or black spots in the image, the coordinates (X, Y, Z) of the defect are calculated. One marking mechanism 18 moves the position of the first protrusion 29 according to the value of the coordinate X, and another marking mechanism 18 moves the position of the second protrusion 30 according to the value of the coordinate Y. The coordinate Z refers to the distance from the first protrusion 29, the second protrusion 30 to the marking paper 31. The coordinate Z is determined by the positioning fixture 1. With reference to the data of the coordinate Z, the distance between the mounting plate 8 and the marking paper 31 can be adjusted by driving the horizontal moving component 11.

[0057] Based on this, the intersection point of the extension of the first correction line 32 and the second correction line 33 is the location of the welding defect. The first correction line 32 and the second correction line 33 do not directly cover the defect location, but achieve the effect of marking the defect location of the radiator. If there are multiple defect locations, the marking protrusion 22 slides on the surface of the marking paper 31 to mark the first correction line 32 and the second correction line 33 of different thicknesses, which are different from other defect locations, so as to facilitate the viewing and review by maintenance personnel and provide convenience for subsequent welding and rework.

[0058] During the repair welding process, refer to Figure 8 The welding platform 34 is required, and the welding equipment is installed on the welding platform 34. The welding platform 34 is made of transparent material. The surface of the welding platform 34 is provided with mutually perpendicular reference lines 35 and an operation window 36. After marking the first correction line 32 and the second correction line 33 on the marking paper 31 on the surface of the heat sink 2 to be inspected, during the welding repair process, the first correction line 32 and the second correction line 33 are aligned with the two reference lines 35 on the welding platform 34, so that the defect position of the heat sink can fall exactly at the operation window 36, which provides convenience for secondary positioning of the welding and greatly improves the welding efficiency.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rapid detection device for detecting defects in a heat sink brazing, characterized by, The utility model relates to a kind of detection device for heat sink, including: Positioning tool (1) provides support and limit for the heat sink (2) to be detected; Machine body structure has detection platform (3), and the upper light source (4) is hoisted on detection platform (3) by support, for the light of the heat sink (2) to be detected is played, the outer side of support is protective shell, transmission guide rail (5) is fixedly installed on detection platform (3), positioning tool (1) is slid along the upper surface of transmission guide rail (5) and enters machine body structure, detection platform (3) is installed for detecting the positioning sensor of positioning tool (1) to place in position; Visual camera (6) carries out image acquisition to the welding surface of the heat sink (2) to be detected; Detection adjusting mechanism has two sets, and two sets of detection adjusting mechanism are installed on detection platform (3), and symmetrically set the two sides of transmission guide rail (5), detection adjusting mechanism has drive module (7) and mounting plate (8), and mounting plate (8) is translated up and down and / or horizontally translated by drive module (7), visual camera (6) is fixedly installed on mounting plate (8), the surface of mounting plate (8) is fixedly installed with two light shields (9), and two light shields (9) are fixedly installed with side light source (10) on the side close to the heat sink (2) to be detected; Marking mechanism (18) has two sets, one set of marking mechanism (18) is arranged in parallel with transmission guide rail (5), and is fixedly installed on the inner side surface of any light shield (9), another set of marking mechanism (18) is vertically arranged, and is fixed between two light shields (9), marking mechanism (18) is used for marking in the non-welding area of the heat sink (2) to be detected, and the defect position is identified; The marking mechanism (18) includes a long strip-shaped substrate (19), two synchronous wheels (20) are rotatably installed inside the substrate (19), a transmission belt (21) is sleeved between the two synchronous wheels (20), the surface of the transmission belt (21) is provided with a marking protrusion (22), the side of the transmission belt (21) close to the transmission guide rail (5) extends to the outside of the substrate (19), a servo motor (23) is fixedly installed on the surface of the substrate (19), any synchronous wheel (20) is driven to rotate by the servo motor (23), and an ink cartridge (24) is screwedly installed on the surface of the substrate (19); The inside of the ink cartridge (24) is provided with a sponge body (25) soaked in ink, a roller holder (26) is slidably installed inside the substrate (19), an intermediate roller (27) is rotatably installed on the roller holder (26), a return spring (28) is arranged inside the substrate (19) and abuts against the roller holder (26), the intermediate roller (27) is arranged between the sponge body (25) and the transmission belt (21), and the surfaces of the sponge body (25) and the intermediate roller (27) are in contact; Under the abutting action of the return spring (28), the intermediate roller (27) moves close to the transmission belt (21), and the intermediate roller (27) and the transmission belt (21) are in a non-contact state, and when the transmission belt (21) operates, the marking protrusion (22) can contact the intermediate roller (27). The marking protrusions (22) in one set of marking mechanisms (18) are first protrusions (29), and the marking protrusions (22) in the other set of marking mechanisms (18) are second protrusions (30); The welding side surface of the heat sink (2) to be detected is pasted with a mark paper (31), when the mounting plate (8) approaches the heat sink (2) to be detected, the first protrusions (29) contact the mark paper (31) and leave first correction lines (32) on the mark paper (31), the second protrusions (30) contact the mark paper (31) and leave second correction lines (33) on the mark paper (31), the first correction lines (32) and the second correction lines (33) are perpendicular to each other, and the intersection of their extension lines corresponds to the defect position.

2. The device for rapid detection of brazing defects based on heat sink according to claim 1, characterized in that: The driving module (7) comprises a horizontal moving assembly (11), the horizontal moving assembly (11) comprises a horizontal sliding rail (12) and a first hydraulic electric cylinder (13), and the horizontal sliding rail (12) and the first hydraulic electric cylinder (13) are fixedly installed on the upper surface of the detection platform (3); a moving seat (14) is slidably installed on the surface of the horizontal sliding rail (12), and the moving seat (14) is driven by the first hydraulic electric cylinder (13) to move close to or away from the transmission rail (5).

3. The device for rapid detection of brazing defects based on heat sink according to claim 2, characterized in that: The driving module (7) comprises an up-down moving assembly (15), the up-down moving assembly (15) comprises a vertical sliding rail (16) and a second hydraulic electric cylinder (17), the mounting plate (8) is slidably installed on the vertical sliding rail (16), and the second hydraulic electric cylinder (17) is fixed on the moving seat (14); the mounting plate (8) is driven by the second hydraulic electric cylinder (17) to move up and down.

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