An AOI inspection device based on IGBT thick aluminum wire welding

Abstract

The present invention discloses an AOI detection device based on IGBT thick aluminum wire after welding, comprising a detection device body, the bottom of the detection device body is connected with a sampling probe through an electric push rod drive, the outer end surface of the sampling probe is sleeved with a closed ring, the bottom of the closed ring is provided with a fitting mechanism, the closed ring is connected to the sampling probe drive, the inner wall of the closed ring is provided with a detection cross bar for strength detection of the aluminum wire, the device can effectively avoid the interference of ambient light on AOI detection, and can also synchronously detect the mechanical strength of the aluminum wire and the welding point.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to an AOI detection equipment based on IGBT thick aluminum wire welding. Background Art

[0002] AOIAutomated Optical Inspection is the abbreviation of automatic optical inspection in Chinese. It is a device that detects common defects encountered in welding production based on optical principles. AOI is a new test technology that has just emerged, but it has developed rapidly. Many manufacturers have launched AOI test equipment. When automatically inspecting, the machine automatically scans the PCB through a camera, collects images, compares the tested solder joints with the qualified parameters in the database, and checks the defects on the PCB through image processing. The defects are displayed / marked through a display or automatic mark for maintenance personnel to repair. High-speed and high-precision visual processing technology is used to automatically detect various mounting errors and welding defects on the PCB board. The range of PCB boards can range from fine-pitch high-density boards to low-density large-size boards, and online inspection solutions can be provided to improve production efficiency and welding quality. By using AOI as a tool to reduce defects, errors can be found and eliminated early in the assembly process to achieve good process control. Early detection of defects will avoid sending bad boards to subsequent assembly stages, and AOI will reduce repair costs and avoid scrapping unrepairable circuit boards.

[0003] Chinese patent publication number CN118294370A discloses an IGBT unit aluminum wire welding defect detection method, a detection device and a detection system. The IGBT unit aluminum wire welding defect detection method includes the following steps: connecting the IGBT unit to the circuit to obtain the current in the circuit; presetting the pulling end point and the preset pulling force value, grabbing the center point of the aluminum wire, pulling it vertically upward, and stopping the movement when the pulling force value is greater than or equal to the preset pulling force value before reaching the pulling end point, and judging that the aluminum wire pulling force value meets the welding requirements; if the pulling force value is still less than the preset pulling force value when pulling to the pulling end point, it is judged that the aluminum wire pulling force value does not meet the welding requirements; when the aluminum wire current value is greater than zero and the pulling force value meets the welding requirements, it is a qualified product; when the aluminum wire current value is equal to zero or the pulling force value does not meet the welding requirements, it is an unqualified product; the present invention can screen out defective products in time, and eliminate the possibility of defective products flowing out due to misjudgment and missed inspection during visual inspection.

[0004] Existing inspections, whether AOI or mechanical pulling inspection, have certain limitations. AOI will be disturbed by ambient light and cannot measure mechanical strength, while mechanical pulling can easily cause secondary damage to circuit boards or solder joints. Therefore, it is necessary to combine the two and use AOI inspection to perform secondary analysis on components after pulling inspection.

[0005] Therefore, it is necessary to provide an AOI inspection device based on IGBT thick aluminum wire after welding to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide an AOI inspection device based on IGBT thick aluminum wire after welding to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an AOI inspection device based on IGBT thick aluminum wire after welding, comprising a detection device body, the bottom of which is connected to a sampling probe through an electric push rod, the outer end face of the sampling probe is sleeved with a closed ring, the bottom of the closed ring is provided with a fitting mechanism, the closed ring is connected to the sampling probe drive, and the inner wall of the closed ring is provided with a detection cross bar for strength detection of the aluminum wire.

[0008] As a further solution of the present invention, the closed ring is connected to an air pressure source through a connecting tube, a connecting cavity connected to the connecting tube is opened inside the closed ring, the fitting mechanism includes an airbag and an annular plate, the annular plate is elastically arranged at the bottom of the closed ring, the airbag is arranged on the side of the annular plate away from the closed ring, and the airbag is connected to the connecting cavity.

[0009] As a further solution of the present invention, a sleeve plate is provided on the side of the annular plate facing away from the airbag, the sleeve plate is slidably fitted on the inner wall of the connecting cavity, a connecting cavity is provided between the sleeve plates, and the connecting cavity is connected to the airbag.

[0010] As a further solution of the present invention, a closing plate is provided inside the connecting cavity, the closing plate passes through the sleeve plate and is connected to the inner wall of the connecting cavity, the annular plate is provided with a first connecting hole, the closing plate is provided with a second through hole, and the first connecting hole and the second through hole are staggered.

[0011] Furthermore, a connecting piece is provided on the outer end surface of the closing plate, and a limiting groove adapted to the connecting piece is provided on the sleeve plate.

[0012] As a further solution of the present invention, the inner wall of the connecting cavity is provided with a crossbar groove adapted to the detection crossbar, the detection crossbar is provided with an inclined surface on the side away from the closed ring, a rotating plate is rotatably embedded in the inclined surface, and the crossbar groove is connected to the connecting cavity.

[0013] Furthermore, the detection cross bar is symmetrically arranged on the inner wall of the closed ring, and a corresponding connecting port is provided on one side of the sleeve plate that fits the cross bar groove. A flexible sealing layer is provided between the sleeve plate and the closed ring to close the connecting port when the connecting port is located at the bottom of the closed ring.

[0014] As a further solution of the present invention, a driving cavity connected to the crossbar groove is provided inside the detection crossbar, the driving cavity is connected to a blowing gap, and the end of the blowing gap away from the driving cavity is connected to the inner side of the rotating plate.

[0015] Furthermore, the blowing gap is inclinedly arranged on one side where the rotating plate is in contact with the blowing gap, the aperture of the blowing gap is smaller than the driving cavity, and the rotating plate is elastically embedded in the end of the detection cross bar away from the closed ring.

[0016] As a further solution of the present invention, a driving gear is provided at the bottom of the detection device body, and tooth grooves matching the driving gear are provided on the outer end surface of the sampling probe and the inner wall of the closed ring.

[0017] As a further solution of the present invention, a limiting slide bar is provided on the outer end face of the detection cross bar, a limiting slide bar is provided on the inner wall of the cross bar groove, a driving rod is fixedly connected to the upper end face of the annular plate, a vertical slot matching the driving rod is provided on the closed ring, the vertical slot and the limiting slide bar are vertically cross-arranged, and a clamping protrusion is provided on one side of the driving rod that is attached to the detection cross bar, and the limiting slide bar is provided with a clamping groove matching the driving gear.

[0018] As a further solution of the present invention, a protection mechanism is also embedded in the inner wall of the closed ring, and the protection mechanism includes an inclined rod, a closing plate and a connecting rod. The connecting rod is horizontally embedded in the inner wall of the closed ring, and the connecting rod is fixedly connected to one end of the closing plate. The inclined rod is fixedly connected to the end of the connecting rod away from the closing plate, and a first sliding cavity of the protection mechanism adapted to the inclined rod is opened inside the closed ring. The inclined rod is elastically arranged inside the protection mechanism, and the vertical slot is connected to the protection mechanism. The end of the driving rod away from the annular plate is provided with an inclined portion that fits with the inclined rod.

[0019] Furthermore, the closing plate can be configured as a square sector or triangle as required, and the closing plate can be made of a transparent material.

[0020] When the present invention is in use, the main body of the detection device is located above the IGBT component to be tested, and the position of the sampling probe is adjusted by the electric push rod to perform AOI analysis on the component. In order to avoid the influence of ambient light on the sampling probe, a closed ring is also provided. The closed ring can drive the fitting mechanism to move downward synchronously when the sampling probe moves and cover the outside of the component, thereby isolating the interference of ambient light on the sampling probe. At the same time, a detection cross bar for detecting the strength of the aluminum wire welding point is provided inside the closed ring. The detection cross bar is placed under the aluminum wire. As the closed ring moves upward, the strength of the aluminum wire and the welding point is detected. After the strength detection is completed, a secondary analysis can be performed through the sampling probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0024] Figure 3 The present invention Figure 2 The enlarged structural diagram at A in the middle;

[0025] Figure 4 It is a schematic diagram of the socket plate structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the closed loop cross-sectional structure of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the present invention under the detection state;

[0028] Figure 7 The present invention Figure 5 The enlarged structural diagram at B in the middle;

[0029] Figure 8 is a schematic diagram of the closed plate structure of the present invention;

[0030] Fig. 9 It is a schematic diagram of the detection crossbar structure of the present invention;

[0031] Fig.10 is a schematic diagram of the driving rod structure of the present invention;

[0032] Fig.11 It is a schematic diagram of the protection mechanism structure of the present invention;

[0033] Fig.12 The present invention Figure 6 Enlarged structural diagram at point C in the middle.

[0034] In the figure: 1. detection device body; 2. electric push rod; 4. closing ring; 6. connecting pipe; 7. connecting cavity; 8. sampling probe; 9. detection cross bar; 10. fitting mechanism; 11. protection mechanism; 12. first sliding cavity; 13. cross bar groove; 14. connecting port; 15. air bag; 16. first connecting hole; 17. annular plate; 18. flexible sealing layer; 19. closing plate; 20. sleeve plate; 21. limiting groove; 22. connecting cavity; 23. driving rod; 24. tooth groove; 25. driving gear; 26. limiting slide groove; 27. vertical clamping groove; 28. connecting piece; 29. ​​second through hole; 30. rotating plate; 31. blowing gap; 32. limiting slide rod; 33. clamping groove; 34. inclined portion; 35. clamping protrusion; 36. inclined rod; 37. closing plate; 38. connecting rod; 39. driving cavity. DETAILED DESCRIPTION

[0035] Embodiment 1

[0036] like Figure 1 - Figure 2 As shown, an AOI inspection device based on IGBT thick aluminum wire after welding includes a detection device body 1, the bottom of the detection device body 1 is connected to a sampling probe 8 through an electric push rod 2, the outer end surface of the sampling probe 8 is sleeved with a closed ring 4, the bottom of the closed ring 4 is provided with a fitting mechanism 10, the closed ring 4 is connected to the sampling probe 8 by driving, and the inner wall of the closed ring 4 is provided with a detection cross bar 9 for strength detection of the aluminum wire.

[0037] When in use, the main body 1 of the detection device is located above the IGBT component to be tested, and the position of the sampling probe 8 is adjusted by the electric push rod 2 to perform AOI analysis on the component. In order to avoid the influence of ambient light on the sampling probe 8, a closed ring 4 is also provided. The closed ring 4 can drive the fitting mechanism 10 to move down synchronously when the sampling probe 8 moves and cover the outside of the component, thereby isolating the interference of ambient light on the sampling probe 8. At the same time, a detection cross bar 9 for detecting the strength of the aluminum wire solder joint is provided inside the closed ring 4. The detection cross bar 9 is placed under the aluminum wire, and the aluminum wire and the solder joint strength are detected as the closed ring 4 moves upward.

[0038] Embodiment 2

[0039] Based on the first embodiment, Figure 1 - Figure 4 As shown, the closed ring 4 is connected to an air pressure source via a connecting tube 6, a connecting cavity 7 connected to the connecting tube 6 is provided inside the closed ring 4, the fitting mechanism 10 includes an airbag 15 and an annular plate 17, the annular plate 17 is elastically arranged at the bottom of the closed ring 4, the airbag 15 is arranged on the side of the annular plate 17 away from the closed ring 4, and the airbag 15 is connected to the connecting cavity 7.

[0040] When in use, the connecting cavity 7 is connected to a constant pressure source through the connecting tube 6, thereby providing a stable pressure to the inside of the airbag 15. As the closing ring 4 moves downward, the airbag 15 fits against the edge of the IGBT component, thereby sealing the area around the component to avoid interference from ambient light. The setting of the airbag 15 can effectively improve the fitting effect on the edge of the component, and the airbag 15 can avoid mechanical pressure on the electrical components.

[0041] like Figure 1 - Figure 4 As shown, a sleeve plate 20 is provided on the side of the annular plate 17 facing away from the airbag 15 , and the sleeve plate 20 is slidably fitted on the inner wall of the connecting cavity 7 , and a connecting cavity 22 is provided between the sleeve plates 20 , and the connecting cavity 22 is connected to the airbag 15 .

[0042] like Figure 1 - Figure 4 and Figure 8As shown, a closing plate 19 is provided inside the connecting cavity 22, and the closing plate 19 passes through the sleeve plate 20 and is connected to the inner wall of the connecting cavity 7. The annular plate 17 is provided with a first connecting hole 16, and the closing plate 19 is provided with a second through hole 29. The first connecting hole 16 and the second through hole 29 are staggered.

[0043] Furthermore, a connecting piece 28 is provided on the outer end surface of the closing plate 19 , and a limiting groove 21 adapted to the connecting piece 28 is provided on the sleeve plate 20 .

[0044] When in use, the connecting chamber 7 is connected with the sleeve plate 20 through a sliding connection, and the connecting chamber 22 inside the sleeve plate 20 is connected with the airbag 15 through the first connecting hole 16. With the relative movement of the annular plate 17 and the closed ring 4, when the closed ring 4 moves downward, the annular plate 17 gradually approaches the closed plate 19. When the closed plate 19 is completely fitted with the annular plate 17, the connection between the airbag 15 and the connecting chamber 7 is disconnected due to the offset setting of the second through hole 29 and the first connecting hole 16.

[0045] like Figure 1 - Figure 7 and Fig. 9 As shown, the inner wall of the connecting cavity 7 is provided with a crossbar groove 13 adapted to the detection crossbar 9 , and the detection crossbar 9 is provided with an inclined surface on the side away from the closed ring 4 , and a rotating plate 30 is rotatably embedded in the inclined surface, and the crossbar groove 13 is connected to the connecting cavity 7 .

[0046] Furthermore, the detection cross bar 9 is symmetrically arranged on the inner wall of the closed ring 4, and a corresponding connecting port 14 is provided on one side of the socket plate 20 that fits the cross bar groove 13. A flexible sealing layer 18 is provided between the socket plate 20 and the closed ring 4 for closing the connecting port 14 when the connecting port 14 is located at the bottom of the closed ring 4.

[0047] During use, after the closed ring 4 completes shielding of ambient light, the connecting cavity 7 is disconnected from the airbag 15, and the socket plate 20 moves upward to connect the connecting cavity 7 with the cross bar groove 13. Under the action of air pressure, the detection cross bar 9 will be pushed out of the inner wall of the closed ring 4 and placed at the bottom of the aluminum wire to be tested through the inclined surface. The pulling force on the aluminum wire during the upward movement of the detection cross bar 9 can be controlled by controlling the air pressure in the connecting cavity 7. If the strength of the aluminum wire and the strength of the weld are qualified, the detection cross bar 9 will separate to both sides. Otherwise, the aluminum wire will break or the weld will detach. After the detection cross bar 9 completes the pulling, the aluminum wire or the weld can be secondary analyzed through the sampling probe 8.

[0048] like Figure 1 - Figure 7 , Fig. 9 and Fig.12 As shown, a driving cavity 39 communicating with the crossbar groove 13 is provided inside the detection crossbar 9 , and the driving cavity 39 is communicated with a blowing gap 31 , and one end of the blowing gap 31 away from the driving cavity 39 is communicated with the inner side of the rotating plate 30 .

[0049] Furthermore, the blowing gap 31 is inclinedly arranged on one side where the rotating plate 30 is fitted, and the aperture of the blowing gap 31 is smaller than the driving cavity 39. The rotating plate 30 is elastically embedded in the end of the detection cross bar 9 away from the closed ring 4. When in use, after the cross bar groove 13 is connected with the connecting cavity 7, the detection cross bar 9 can be driven to gradually extend. During the extension process, the driving cavity 39 is connected with the connecting cavity 7 through the cross bar groove 13, and the blowing gap 31 is connected with the driving cavity 39. The aperture of the blowing gap 31 is small, so that the blowing gap 31 generates a high-speed airflow, and the airflow impacts the rotating plate 30 to open the rotating plate 30. The airflow is ejected along the circuit board and the aluminum wire under the resistance of the rotating plate 30, so that the gap between the aluminum wire and the circuit board is increased to facilitate the insertion of the detection cross bar 9. At the same time, the high-speed airflow can also remove the solder joints and dust around the aluminum wire and other particulate impurities to avoid interference with the detection of the sampling probe 8, thereby improving the detection accuracy and reducing the damage of the detection cross bar 9 to the IGBT component.

[0050] like Figure 1 - Figure 6 As shown, a driving gear 25 is provided at the bottom of the detection device body 1 , and tooth grooves 24 matched with the driving gear 25 are provided on the outer end surface of the sampling probe 8 and the inner wall of the closed ring 4 .

[0051] When in use, the sampling probe 8 is driven up and down by the electric push rod 2, and the closed ring 4 can be synchronously driven up and down through the tooth groove 24 and the driving gear 25. The movement state of the sampling probe 8 and the closed ring 4 can be controlled by the setting of the driving gear 25. The closed ring 4 and the sampling probe 8 can be moved synchronously after the driving gear 25 is locked, and the closed ring 4 and the sampling probe 8 can move in the opposite direction after the driving gear 25 is unlocked.

[0052] like Figure 1 - Figure 7 and Figure 9-12 As shown, a limiting slide bar 32 is provided on the outer end face of the detection cross bar 9, a limiting slide bar 26 matched with the limiting slide bar 32 is provided on the inner wall of the cross bar groove 13, a driving rod 23 is fixedly connected to the upper end face of the annular plate 17, a vertical clamping groove 27 matched with the driving rod 23 is provided on the closed ring 4, the vertical clamping groove 27 is vertically cross-arranged with the limiting slide bar 26, and a clamping protrusion 35 is provided on the side of the driving rod 23 that is attached to the detection cross bar 9, and the limiting slide bar 32 is provided with a clamping groove 33 matched with the driving gear 25.

[0053] When in use, the driving rod 23 is inserted into the interior of the closed ring 4. When the annular plate 17 is not in contact with the bottom of the closed ring 4, the snap-in protrusion 35 of the driving rod 23 is snap-in with the snap-in groove 33, thereby limiting the detection cross bar 9. When the annular plate 17 is in contact with the bottom of the closed ring 4 and the connecting cavity 7 is connected with the cross bar groove 13, the snap-in protrusion 35 is separated from the snap-in groove 33 as the driving rod 23 moves upward, thereby releasing the limitation on the detection cross bar 9. The detection cross bar 9 is further fixed by the driving rod 23. The vertical height of the connecting port 14 can be higher than the bottom of the snap-in protrusion 35, so that the cross bar groove 13 can be connected with the connecting cavity 7 before the detection cross bar 9 is limited, and the assembly is cleaned to a certain extent by air pressure with the help of the blowing gap 31.

[0054] like Figure 1 - Figure 7 and Fig.11 As shown, a protection mechanism 11 is also embedded in the inner wall of the closed ring 4, and the protection mechanism 11 includes an inclined rod 36, a closing plate 37 and a connecting rod 38. The connecting rod 38 is horizontally embedded in the inner wall of the closed ring 4, and the connecting rod 38 is fixedly connected to one end of the closing plate 37. The inclined rod 36 is fixedly connected to the end of the connecting rod 38 away from the closing plate 37, and a first sliding cavity 12 of the protection mechanism adapted to the inclined rod 36 is opened inside the closed ring 4, the inclined rod 36 is elastically arranged inside the protection mechanism 11, the vertical slot 27 is connected to the protection mechanism 11, and the end of the driving rod 23 away from the annular plate 17 is provided with an inclined portion 34 that fits with the inclined rod 36.

[0055] Furthermore, the closing plate 37 can be configured to be a square sector or a triangle as required, and the closing plate 37 can be made of a transparent material.

[0056] During use, as the driving rod 23 moves, the inclined portion 34 at the end of the driving rod 23 will also move upward inside the protective mechanism 11, and the closing plate 37 will be driven to move horizontally under the action of the inclined portion 34 and the inclined rod 36. By means of multiple groups of closing plates 37 moving horizontally and splicing each other, the interior of the closed ring 4 is closed, thereby effectively avoiding the contamination of the surface of the sampling probe 8 by debris during the blowing process. At the same time, the elastic pressing of the inclined rod 36 and the driving rod 23 makes the annular plate 17 elastically arranged at the bottom of the closed ring 4. During the downward movement of the closed ring 4, since the gas pressure is set inside the airbag 15, after the airbag 15 contacts the surface of the component, the distance between the annular plate 17 and the bottom of the closed ring 4 will be compressed first, until the airbag 15 and the connecting cavity 7 are closed, and part of the gas can be retained in the airbag 15 after closing to serve as a closed buffer.

[0057] Working principle: The main body 1 of the detection device is located above the IGBT component to be tested. The position of the sampling probe 8 is adjusted by the electric push rod 2 to perform AOI analysis on the component. In order to avoid the influence of ambient light on the sampling probe 8, a closed ring 4 is also provided. The closed ring 4 can drive the fitting mechanism 10 to move down synchronously when the sampling probe 8 moves and cover the outside of the component, thereby isolating the interference of ambient light on the sampling probe 8. At the same time, a detection cross bar 9 for detecting the strength of the aluminum wire welding point is provided inside the closed ring 4. The detection cross bar 9 is placed under the aluminum wire. As the closed ring 4 moves upward, the strength of the aluminum wire and the welding point is detected. The connecting cavity 7 is connected to a constant pressure source through a connecting pipe 6, thereby providing a stable pressure to the inside of the airbag 15. As the closed ring 4 moves downward, the airbag 15 is fitted with the edge of the IGBT component, thereby sealing the periphery of the component to avoid interference from ambient light. The setting of the airbag 15 can effectively improve the fitting effect on the edge of the component, and the airbag 15 can avoid mechanical pressure on the electrical component. The connecting cavity 7 is slidably provided with a sleeve plate 20, and the connecting cavity 22 inside the sleeve plate 20 is connected with the airbag 15 through the first connecting hole 16. With the relative movement of the annular plate 17 and the closed ring 4, when the closed ring 4 moves downward, the annular plate 17 gradually approaches the closing plate 19. When the closing plate 19 is completely fitted with the annular plate 17, the connection between the airbag 15 and the connecting cavity 7 is disconnected due to the misalignment of the sleeve plate 20 and the first connecting hole 16. When the closed ring 4 completes shielding of the ambient light, the connecting cavity 7 is disconnected from the airbag 15. The capsule 15 is connected and disconnected, and the socket plate 20 will connect the connecting chamber 7 with the cross bar groove 13 as it moves upward. Under the action of air pressure, the detection cross bar 9 will be pushed out of the inner wall of the closed ring 4 and placed at the bottom of the aluminum wire to be tested through the inclined surface. The pulling force on the aluminum wire during the upward movement of the detection cross bar 9 can be controlled by controlling the air pressure in the connecting chamber 7. If the strength of the aluminum wire and the strength of the welding point are qualified, the detection cross bar 9 will separate to both sides, otherwise the aluminum wire will break or the welding point will be detached, and after the detection cross bar 9 is pulled, the aluminum wire or the welding point can be secondary analyzed by the sampling probe 8. After the cross bar groove 13 is connected with the connecting chamber 7, the detection cross bar 9 can be driven to gradually extend. During the extension process, the driving chamber 39 is connected with the connecting chamber 7 through the cross bar groove 13, and the blowing gap 31 is connected with the driving chamber 39, and The aperture of the blowing gap 31 is small, so that the blowing gap 31 generates a high-speed airflow, and the airflow impacts the rotating plate 30 to open the rotating plate 30, and the airflow is ejected along the gap between the circuit board and the aluminum wire under the resistance of the rotating plate 30, so that the gap between the aluminum wire and the circuit board is increased to facilitate the insertion of the detection cross bar 9. At the same time, the high-speed airflow can also remove the solder joints and dust around the aluminum wire and other particulate impurities to avoid interference with the detection of the sampling probe 8, thereby improving the detection accuracy and reducing the damage of the detection cross bar 9 to the IGBT component. The sampling probe 8 is driven up and down by the electric push rod 2, and the tooth groove 24 and the driving gear 25 can be synchronously driven to move up and down the closed ring 4, and the movement state of the sampling probe 8 and the closed ring 4 can be controlled by setting the driving gear 25.After the driving gear 25 is locked, the closed ring 4 and the sampling probe 8 move synchronously. When the driving gear 25 is unlocked, the closed ring 4 and the sampling probe 8 move in the opposite direction. The driving rod 23 is inserted into the inside of the closed ring 4. When the annular plate 17 is not in contact with the bottom of the closed ring 4, the engaging protrusion 35 of the driving rod 23 is engaged with the engaging groove 33, thereby limiting the detection cross bar 9. When the annular plate 17 is in contact with the bottom of the closed ring 4 and the connecting cavity 7 is connected with the cross bar groove 13, the engaging protrusion 35 is separated from the engaging groove 33 as the driving rod 23 moves upward, thereby releasing the limit on the detection cross bar 9. The detection cross bar 9 is further fixed by the driving rod 23. The vertical height of the connecting port 14 can be higher than the bottom of the engaging protrusion 35, so that the cross bar groove 13 can be connected with the connecting cavity 7 before the detection cross bar 9 is limited. The air gap 31 cleans the assembly to a certain extent. As the driving rod 23 moves, the inclined portion 34 at the end of the driving rod 23 will also move upward inside the protection mechanism 11. Under the action of the inclined portion 34 and the inclined rod 36, the closing plate 37 will be driven to move horizontally. By moving multiple groups of closing plates 37 horizontally and splicing each other, the interior of the closed ring 4 is closed, thereby effectively avoiding the contamination of the surface of the sampling probe 8 by debris during the blowing process. At the same time, the elastic pressing of the inclined rod 36 and the driving rod 23 makes the annular plate 17 elastically set at the bottom of the closed ring 4. During the downward movement of the closed ring 4, since there is gas pressure inside the airbag 15, after the airbag 15 contacts the surface of the assembly, the distance between the annular plate 17 and the bottom of the closed ring 4 will be compressed first, until the airbag 15 and the connecting cavity 7 are closed, and after closing, part of the gas can be retained in the airbag 15 as a closed buffer.

Claims

1. An AOI inspection device based on IGBT thick aluminum wire welding, including a detection device body, characterized in that: The bottom of the detection device body is connected to a sampling probe through an electric push rod, the outer end surface of the sampling probe is sleeved with a closed ring, the bottom of the closed ring is provided with a fitting mechanism, the closed ring is connected to the sampling probe drive, and the inner wall of the closed ring is provided with a detection cross bar for strength detection of the aluminum wire; The closed ring is connected to an air pressure source through a connecting pipe, a connecting cavity connected to the connecting pipe is provided inside the closed ring, the fitting mechanism comprises an airbag and an annular plate, the annular plate is elastically arranged at the bottom of the closed ring, the airbag is arranged on a side of the annular plate away from the closed ring, and the airbag is connected to the connecting cavity; A sleeve plate is provided on the side of the annular plate facing away from the airbag, and the sleeve plate is slidably fitted on the inner wall of the communication cavity. A communication cavity is provided between the sleeve plates, and the communication cavity is connected to the airbag; A closing plate is provided inside the communicating cavity, the closing plate penetrates the sleeve plate and is connected to the inner wall of the communicating cavity, the annular plate is provided with a first communicating hole, the closing plate is provided with a second through hole, and the first communicating hole and the second through hole are staggered; The inner wall of the communication cavity is provided with a crossbar groove adapted to the detection crossbar, the detection crossbar is provided with an inclined surface on the side away from the closed ring, a rotating plate is rotatably embedded in the inclined surface, and the crossbar groove is connected with the communication cavity.

2. The AOI inspection equipment based on IGBT thick aluminum wire after welding according to claim 1 is characterized in that: A driving cavity connected to the crossbar groove is provided inside the detection crossbar, and the driving cavity is connected to a blowing gap, and an end of the blowing gap away from the driving cavity is connected to the inner side of the rotating plate.

3. The AOI inspection equipment based on IGBT thick aluminum wire after welding according to claim 1 is characterized in that: A driving gear is arranged at the bottom of the main body of the detection device, and tooth grooves matching the driving gear are arranged on the outer end surface of the sampling probe and the inner wall of the closed ring.

4. The AOI inspection equipment based on IGBT thick aluminum wire after welding according to claim 1 is characterized in that: The outer end surface of the detection cross bar is provided with a limit sliding bar, the inner wall of the cross bar groove is provided with a limit sliding groove matched with the limit sliding bar, the upper end surface of the annular plate is fixedly connected with a driving rod, the closed ring is provided with a vertical clamping groove matched with the driving rod, the vertical clamping groove and the limit sliding groove are arranged vertically and crosswise, and a clamping protrusion is provided on one side of the driving rod that is attached to the detection cross bar, and the limit sliding bar is provided with a clamping groove matched with the driving gear.

5. The AOI inspection equipment based on IGBT thick aluminum wire after welding according to claim 4 is characterized in that: The inner wall of the closed ring is also embedded with a protection mechanism, which includes an inclined rod, a closing plate and a connecting rod. The connecting rod is horizontally embedded in the inner wall of the closed ring, the connecting rod is fixedly connected to one end of the closing plate, the inclined rod is fixedly connected to the end of the connecting rod away from the closing plate, and a first sliding cavity of the protection mechanism adapted to the inclined rod is opened inside the closed ring, the inclined rod is elastically arranged inside the protection mechanism, the vertical slot is connected to the protection mechanism, and an inclined portion is provided on the end of the driving rod away from the annular plate to fit with the inclined rod.

Images