Visual detection module and detection method for carrier tape defects

Abstract

The invention relates to the technical field of carrier tape flaw visual inspection, and particularly discloses a carrier tape flaw visual inspection module which comprises an installation frame and a control panel installed on the surface of the installation frame, a supporting frame is arranged in the installation frame, an installation pipe is supported on the supporting frame, a camera shooting assembly is arranged in the installation pipe, and the camera shooting assembly is connected with the control panel. The camera shooting assembly is connected with a sealing dustproof mechanism, the sealing dustproof mechanism comprises a piston disc which is seamlessly and slidably connected to the middle lower portion in the mounting pipe, a lens part of the camera shooting assembly seamlessly penetrates through the piston disc to the position below the piston disc, and the camera shooting assembly is further connected with a displacement control mechanism; the displacement control mechanism comprises a sleeve connected to the upper end of the camera shooting assembly through a bearing. According to the invention, dust can be prevented from being adsorbed on the lens under the condition that the detection operation is not influenced, so that the detection efficiency can be ensured, in addition, heat dissipation can be performed on the interior of the camera shooting assembly in real time, and the situation that high temperature is accumulated in the camera shooting assembly, so that the camera shooting assembly is blocked, and normal visual detection is influenced is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carrier tape visual inspection, in particular to a carrier tape defect visual inspection module and method. BACKGROUND

[0002] Carrier tape refers to a strip-shaped product applied in the field of electronic packaging, which has a specific thickness and equidistantly distributed holes for holding electronic components and positioning holes for indexing along the length direction. With the development of electronic components towards miniaturization, high precision and high reliability, the requirements for carrier tapes are increasingly stringent, which directly leads to the application of new materials in the field of carrier tapes. As a key supporting component in the electronic manufacturing industry chain, carrier tapes require large-scale, stability and cost control of materials, providing important support for the technical iteration and market verification of new materials. When packaging electronic components with carrier tapes, a CCD visual inspection device is used to check whether the packaging size and structure position of the carrier tape are correct. However, the existing visual inspection module cannot avoid dust adsorption on the lens during use, which may easily lead to incorrect identification of dust as defects during detection, resulting in inaccurate detection results. Although existing technologies have structures for cleaning the lens, such as the CCD visual inspection device for carrier tape forming machine disclosed in CN216594818U, which can clean the lens regularly using an electric push rod and a cleaning brush. However, since the cleaning is regular, the carrier tape cannot be detected during the cleaning process, resulting in reduced detection efficiency. In addition, the existing visual inspection module works for a long time, which generates a lot of heat inside. If not cooled in time, the visual inspection module will jam and cannot perform normal shooting detection. Therefore, there is a need for a carrier tape defect visual inspection module to solve the above problems. SUMMARY

[0003] The present application aims to provide a carrier tape defect visual inspection module and method to solve the problems of reduced detection efficiency due to regular cleaning of the lens to avoid dust affecting the detection results, and jamming due to poor heat dissipation during long-term use, which affects the detection efficiency.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A visual inspection module for carrier defects includes a mounting frame and a control panel mounted on its surface. The mounting frame has an internal support frame supporting a mounting tube. A camera assembly is housed inside the mounting tube, and a sealing and dustproof mechanism is connected to the camera assembly. The sealing and dustproof mechanism includes a piston disc seamlessly slidably connected to the lower middle part of the mounting tube, with the lens portion of the camera assembly seamlessly penetrating the piston disc to its lower portion. A displacement control mechanism is also connected to the camera assembly, and the displacement control mechanism includes a sleeve with a bearing connected to the upper end of the camera assembly. A lead screw is threaded to the inner side of the upper end of the sleeve, and a heat dissipation and dustproof mechanism is connected to the upper end of the lead screw. The heat dissipation and dustproof mechanism includes a servo motor connected to the top of the mounting tube via a motor bracket. The top of the mounting tube has densely packed dustproof filter holes.

[0005] Preferably, the sealing and dustproof mechanism further includes a shaft core assembly fixedly connected to the outside of the mounting tube, and a bushing is sleeved on the outer bearing of the middle part of the shaft core assembly. Torsion springs are provided between both ends of the bushing and the inner side of the shaft core assembly. A cover plate is connected to the bushing, and an air cushion is provided on the cover plate. Guide wheels are provided on the mounting tube, the cover plate, the bushing, and the camera assembly, and the guide wheels are connected to each other by steel wire ropes. The guide wheels on the mounting tube and the camera assembly are fixedly connected to both ends of the steel wire ropes, respectively.

[0006] Preferably, the outer diameter of the cover plate is larger than the outer diameter of the mounting tube, and the diameter of the air cushion is between the inner diameter of the mounting tube and the outer diameter of the cover plate.

[0007] Preferably, the displacement control mechanism further includes a limiting plate fixedly connected inside the mounting tube, and two limiting rods are symmetrically arranged on the limiting plate. The axis of the limiting rods is parallel to the axis of the sleeve. An mounting block is sleeved on the outer side of the upper end of the sleeve, and the mounting block is movably penetrated by the upper ends of the two limiting rods. The upper and lower ends of the mounting block are connected to the outer side of the sleeve by bearing connection.

[0008] Preferably, the displacement control mechanism further includes two connecting grooves evenly distributed on the outer side of the upper end of the sleeve. The mounting block is symmetrically provided with two cross grooves penetrating its inner and outer sides, and the position of the cross grooves corresponds to the position of the connecting grooves. Each connecting groove is permeated with a corresponding T-shaped connecting block, and the end size of the T-shaped connecting block matches the size of the connecting groove, so that the end of the T-shaped connecting block can be engaged with the inside of the connecting groove.

[0009] Preferably, the displacement control mechanism further includes two sets of guide blocks symmetrically arranged on the mounting block, and each set of guide blocks has two blocks. The two guide blocks in the same set are symmetrically arranged about the center of the axis of the corresponding T-shaped connecting block. The guide blocks are movably inserted through the mounting block, and the strip channel opened on the mounting block for the guide blocks to move through is connected to the corresponding cross groove. Each guide block is provided with a through groove that runs through both sides of it, and the through groove has a V-shaped structure. The middle of the T-shaped connecting block is provided with two symmetrical guide rods, and the two guide rods on the same T-shaped connecting block slide through the through grooves on the corresponding two guide blocks respectively.

[0010] Preferably, the T-shaped connecting block is further provided with a contact plate coaxial with it, and a spring is provided between the contact plate and the inner side of the cross groove, the spring being sleeved on the outer side of the corresponding T-shaped connecting block.

[0011] Preferably, the heat dissipation and dust prevention mechanism further includes air inlets symmetrically arranged on the limiting plate, and the air inlets are arranged through both sides of the limiting plate. The air inlets are connected to the interior of the camera assembly through corresponding spring tubes, and the camera assembly is provided with ventilation holes that penetrate through its inner and outer sides. The upper end of the lead screw is coaxially connected to the fan blade assembly, and the fan blade assembly is coaxially installed on the shaft end of the servo motor. The fan blade assembly is arranged inside the mounting tube.

[0012] Preferably, the heat dissipation and dust prevention mechanism further includes an annular groove disposed on the upper surface of the piston disk, and one-way jet holes extending to the lower surface of the piston disk are distributed at equal angles on the inner bottom surface of the annular groove. The axis of the one-way jet holes is tangent to the axis of the inner bottom surface of the annular groove, and the axis of the one-way jet holes is inclined outward from the axis of the mounting tube.

[0013] A detection method for a visual inspection module includes the following steps: Step 1: Secure the mounting bracket to the carrier belt machine so that the carrier belt passes under the mounting tube; Step 2: Start the servo motor to drive the fan blade assembly to rotate slowly. When the fan blade assembly rotates, the lead screw rotates slowly in sync. During this process, because the sleeve and the mounting block are connected by the T-shaped connecting block and the connecting groove, and the mounting block is limited by the limit rod, the sleeve is indirectly limited, preventing it from rotating. As a result, the sleeve moves downward along its axis during the rotation of the lead screw. During the movement of the sleeve, the camera assembly moves synchronously. As the camera assembly moves, the cover plate is opened by pulling the steel wire rope, and the torsion spring accumulates elastic potential energy. When the guide block moves to contact the limiting plate and moves relative to the mounting block due to compression, the T-shaped connecting block can be gradually moved away from the connecting groove through the oblique through groove and the guide rod, and the spring accumulates elastic potential energy. At this time, since the T-shaped connecting block and the connecting groove are no longer engaged, the sleeve is no longer limited, and the sleeve rotates synchronously with the lead screw. At this time, the lens part of the camera assembly will also extend out of the lower opening of the mounting tube. Step 3: Drive the servo motor to rotate the fan blade assembly quickly. At this time, the fan blade assembly will draw in the outside air into the inside of the mounting tube. The air that enters the mounting tube will enter the inside of the camera assembly through the air inlet and spring tube, and will be discharged from the air outlet. This can increase the heat exchange between the inside and outside of the camera assembly, so as to facilitate efficient heat dissipation of the electronic equipment inside the camera assembly. Step 4: The gas discharged from the vent hole passes through the annular groove and the one-way jet hole in sequence and is discharged to the bottom of the mounting tube. During the process, since the axis of the one-way jet hole is tangent to the axis of the bottom surface of the annular groove, and the axis of the one-way jet hole is inclined outward from the axis of the mounting tube, an outwardly diffused vortex airflow will be formed below the mounting tube. This can reduce the possibility of dust or other dirt coming into contact with the lens, and avoid the lens being contaminated, which would lead to incorrect test results. In addition, the outward-spreading vortex airflow formed below the mounting tube will blow towards the carrier belt, thereby blowing away the dust adsorbed on the carrier belt and avoiding inaccurate test results due to dust remaining on the carrier belt. Step 4: After the inspection is completed, start the servo motor in reverse. The elastic potential energy accumulated by the spring will cause the T-shaped connecting block and the connecting groove to re-engage, and the sleeve will move upward, which will in turn drive the camera assembly to move upward. During the process, the elastic potential energy accumulated by the torsion spring causes the cover plate to rotate in the opposite direction, which allows the air cushion to be pressed into the inner side of the lower end of the mounting tube. Then, the camera assembly continues to move upward, and a negative pressure will be generated between the air cushion and the piston plate, which can stably adsorb the cover plate to the lower end of the mounting tube to prevent dust from entering the interior of the mounting tube.

[0014] Compared with the prior art, the beneficial effects of this invention are: the carrier tape defect visual inspection module can prevent dust from adhering to the lens without affecting its inspection operation, thus ensuring its inspection efficiency. Furthermore, it can dissipate heat from the internal components of the camera assembly in real time to prevent high temperatures from accumulating inside the camera assembly, causing it to jam and affecting the normal operation of visual inspection. This makes visual inspection of carrier tapes made of new materials more efficient and faster, avoiding inaccurate inspection results due to dust or other contaminants when the carrier tape made of new materials has defects. 1. When the camera assembly is not in operation, it retracts into the mounting tube. The cover plate prevents external dust from contacting the lens of the camera assembly, thus preventing dust from adhering to the lens. During the operation of the camera assembly, airflow is ejected through the one-way jet hole, forming a vortex airflow protective shield at the position of the camera assembly lens to prevent dust from entering and thus preventing dust from contacting the lens. Moreover, the detection work of the camera assembly does not need to be stopped during the process, which helps to improve its detection effect. 2. The forward operation of the servo motor allows the camera assembly to move downwards gradually. During this process, the guide wheel and steel cable rotate the cover plate, opening the lower end of the mounting tube. This allows the lens of the camera assembly to extend out of the lower end of the mounting tube. The servo motor also rotates the fan blade assembly, allowing external air to enter the mounting tube through the dust filter hole at the upper end. The air entering the mounting tube then enters the camera assembly through the air inlet and spring tube, and is discharged through the air outlet, thus timely dissipating the heat inside the camera assembly. Subsequently, the air is ejected through the annular groove and one-way jet hole to form a vortex airflow protective cover. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the main structure of the mounting pipe of the present invention; Figure 3 This is a partial cross-sectional view of the mounting pipe of the present invention; Figure 4 This is a schematic diagram of the connection structure between the servo motor and the piston disk of the present invention; Figure 5 For the present invention Figure 4 Mid-section structural schematic diagram; Figure 6 For the present invention Figure 5 Enlarged structural diagram of point A in the middle; Figure 7 For the present invention Figure 5 Enlarged structural diagram of point B; Figure 8 This is a schematic diagram of the connection structure between the servo motor and the limiting plate of the present invention; Figure 9 For the present invention Figure 8 A magnified structural diagram of point C.

[0016] In the diagram: 1. Mounting bracket; 2. Control panel; 3. Support frame; 4. Mounting tube; 5. Shaft assembly; 6. Bushing; 7. Torsion spring; 8. Cover plate; 9. Guide wheel; 10. Steel wire rope; 11. Motor bracket; 12. Servo motor; 13. Air cushion; 14. Piston disc; 15. Camera assembly; 16. Limiting plate; 17. Bourdon tube; 18. Limiting rod; 19. Sleeve; 20. Vent hole; 21. Air inlet; 22. Mounting block; 23. Fan blade assembly; 24. Lead screw; 25. Cross groove; 26. T-shaped connecting block; 27. Spring; 28. Connecting groove; 29. ​​Guide block; 30. Ring groove; 31. One-way jet hole; 32. Angled through groove; 33. Guide rod. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-9 The present invention provides the following technical solution: Example 1: To address the problem that dust easily adheres to the lens of conventional carrier tape defect visual inspection modules when not in use and exposed to air, thus affecting inspection results, the following technical solution is provided: A carrier tape defect visual inspection module includes a mounting frame 1 and a control panel 2 mounted on its surface. The mounting frame 1 has a support frame 3 inside, and a mounting tube 4 is supported on the support frame 3. A camera assembly 15 is installed inside the mounting tube 4, and a sealing and dustproof mechanism is connected to the camera assembly 15. The sealing and dustproof mechanism includes a piston disc 14 seamlessly slidably connected to the lower middle part of the mounting tube 4, and the lens portion of the camera assembly 15 seamlessly penetrates the piston disc 14 to its lower part. A displacement control mechanism is also connected to the camera assembly 15, and the displacement control mechanism includes a sleeve 19 with a bearing connected to the upper end of the camera assembly 15.

[0019] The sealing and dustproof mechanism also includes a shaft core assembly 5 fixedly connected to the outside of the mounting tube 4, and a bushing 6 is sleeved on the outer bearing of the middle part of the shaft core assembly 5. Torsion springs 7 are provided between the two ends of the bushing 6 and the inner side of the shaft core assembly 5. A cover plate 8 is connected to the bushing 6, and an air cushion 13 is provided on the cover plate 8. Guide wheels 9 are provided on the mounting tube 4, the cover plate 8, the bushing 6 and the camera assembly 15, and the guide wheels 9 are connected to each other by a steel wire rope 10. The guide wheels 9 on the mounting tube 4 and the camera assembly 15 are fixedly connected to the two ends of the steel wire rope 10 respectively. The outer diameter of the cover plate 8 is larger than the outer diameter of the mounting tube 4, and the diameter of the air cushion 13 is between the inner diameter of the mounting tube 4 and the outer diameter of the cover plate 8.

[0020] according to Figure 2 and Figure 3 When the camera assembly 15 moves to the lower end of the mounting tube 4, under the action of the guide wheel 9 and the wire rope 10, the cover plate 8 can be flipped through the bushing 6, thereby opening the lower end of the mounting tube 4. During the flipping process of the cover plate 8, the torsion spring 7 will accumulate elastic potential energy so that when the camera component 15 moves into the mounting tube 4, the cover plate 8 can flip back to its original position. After the cover plate 8 seals the lower opening of the mounting tube 4, it can prevent dust from entering from the lower opening of the mounting tube 4, thereby preventing the lens on the camera assembly 15 from being contaminated by dust.

[0021] The displacement control mechanism also includes a limiting plate 16 fixedly connected inside the mounting tube 4, and two limiting rods 18 symmetrically arranged on the limiting plate 16. The axis of the limiting rods 18 is parallel to the axis of the sleeve 19. A mounting block 22 is fitted on the outer side of the upper end of the sleeve 19, and the upper ends of the two limiting rods 18 are movably penetrating the mounting block 22. The upper and lower ends of the mounting block 22 are connected to the outer side of the sleeve 19 by bearing connection. The displacement control mechanism also includes two connecting grooves 28 evenly distributed on the outer side of the upper end of the sleeve 19. Two cross grooves 25 symmetrically arranged on the mounting block 22, penetrating its inner and outer sides, are provided. The position of the cross grooves 25 corresponds to the position of the connecting grooves 28. A corresponding T-shaped connecting block 26 is penetrating each connecting groove 28, and the end size of the T-shaped connecting block 26 matches the size of the connecting groove 28, so that the end of the T-shaped connecting block 26 can be engaged inside the connecting groove 28, thus controlling the displacement. The control mechanism also includes two sets of guide blocks 29 symmetrically arranged on the mounting block 22, with two guide blocks 29 in each set. The two guide blocks 29 in the same set are symmetrically arranged about the axis of the corresponding T-shaped connecting block 26. The guide blocks 29 are movably connected through the mounting block 22, and the strip-shaped channel on the mounting block 22 for the guide blocks 29 to move through is connected to the corresponding cross groove 25. Each guide block 29 is provided with a through groove 32 that runs through both sides of it, and the through groove 32 has a V-shaped structure. The middle of the T-shaped connecting block 26 is provided with two symmetrical guide rods 33, and the two guide rods 33 on the same T-shaped connecting block 26 slide through the through grooves 32 on the corresponding two guide blocks 29 respectively. The T-shaped connecting block 26 is also provided with a contact plate coaxial with it, and a spring 27 is provided between the contact plate and the inner side of the cross groove 25. The spring 27 is sleeved on the outer side of the corresponding T-shaped connecting block 26.

[0022] according to Figures 4-6 as well as Figures 8-9 Through the engaging connection between the connecting groove 28 and the T-shaped connecting block 26, and the through connection between the mounting block 22 and the limiting rod 18, the sleeve 19 is indirectly limited, so that it can only move along its axis and cannot rotate. When the servo motor 12 drives the fan blade assembly 23 and the lead screw 24 to rotate synchronously on the same axis, the sleeve 19 can move downward along its axis, thereby driving the camera assembly 15 to move downward synchronously. When the mounting block 22 moves with the sleeve 19 to the guide block 29 on it and contacts the limiting plate 16, it will be displaced and the T-shaped connecting block 26 will be gradually pulled out from the connecting groove 28. Then the sleeve 19 will no longer be limited and it will be able to rotate synchronously with the lead screw 24, thereby keeping the position of the camera assembly 15 constant so that the camera assembly 15 can detect the carrier tape. Example 2: To address the issues of poor detection efficiency and module jamming due to poor heat dissipation in previous visual inspection modules for carrier defects, which required regular lens cleaning during use, and the following technical solution is provided: A lead screw 24 is threaded to the inner side of the upper end of the sleeve 19, and a heat dissipation and dust prevention mechanism is connected to the upper end of the lead screw 24. The heat dissipation and dust prevention mechanism includes a servo motor 12 connected to the top of the mounting tube 4 via a motor bracket 11, and the top of the mounting tube 4 is provided with dense dust filter holes.

[0023] The heat dissipation and dust prevention mechanism also includes air inlets 21 symmetrically arranged on the limiting plate 16, and the air inlets 21 are arranged through both sides of the limiting plate 16. The air inlets 21 are connected to the inside of the camera assembly 15 through the corresponding spring tube 17. The camera assembly 15 is provided with air outlets 20 that penetrate through its inner and outer sides. The upper end of the lead screw 24 is coaxially connected to the fan blade assembly 23, and the fan blade assembly 23 is coaxially mounted on the shaft end of the servo motor 12. The fan blade assembly 23 is arranged inside the mounting tube 4. The heat dissipation and dust prevention mechanism also includes an annular groove 30 arranged on the upper surface of the piston plate 14. One-way jet holes 31 that penetrate to the lower surface of the piston plate 14 are distributed at equal angles on the inner bottom surface of the annular groove 30. The axis of the one-way jet hole 31 is tangent to the axis of the inner bottom surface of the annular groove 30, and the axis of the one-way jet hole 31 is inclined outward from the axis of the mounting tube 4.

[0024] according to Figure 5 and Figure 7 When the fan blade assembly 23 rotates, it will generate suction at the top of the mounting tube 4, which will allow external air to enter the interior of the mounting tube 4 through the dust filter hole. The gas entering the mounting tube 4 will enter the camera assembly 15 through the air inlet 21 and the spring tube 17 (the sleeve 19 is set to slide seamlessly through the limiting plate 16), and will be discharged through the air outlet 20, so as to dissipate the heat inside the camera assembly 15 in a timely manner. The heat discharged through the vent 20 is then sprayed sequentially through the annular groove 30 and the one-way jet vent 31 toward the bottom of the mounting tube 4, thereby forming a vortex protective shield to isolate dust and prevent dust from contacting the lens, thus preventing dust from contaminating the lens in real time without stopping the detection. In addition, the gas sprayed below the mounting tube 4 can blow away the dust adsorbed on the surface of the carrier tape, preventing the dust from affecting the test results.

[0025] A detection method for a visual inspection module includes the following steps: Step 1: Fix the mounting bracket 1 onto the carrier belt machine so that the carrier belt passes under the mounting tube 4; Step 2: Start the servo motor 12 to drive the fan blade assembly 23 to rotate slowly. When the fan blade assembly 23 rotates, the lead screw 24 rotates slowly in sync. During the process, because the sleeve 19 and the mounting block 22 are engaged and connected by the T-shaped connecting block 26 and the connecting groove 28, and the mounting block 22 is limited by the limiting rod 18, the sleeve 19 is indirectly limited and cannot rotate. As a result, the sleeve 19 moves downward along its axis during the rotation of the lead screw 24. During the movement of the sleeve 19, the camera component 15 moves synchronously. During the movement of the camera component 15, the cover plate 8 is opened by the steel wire rope 10, and the torsion spring 7 accumulates elastic potential energy. When the guide block 29 moves to contact the limiting plate 16 and moves relative to the mounting block 22 due to compression, the T-shaped connecting block 26 can be gradually moved away from the connecting groove 28 through the oblique through groove 32 and the guide rod 33, and the spring 27 accumulates elastic potential energy. At this time, since the T-shaped connecting block 26 and the connecting groove 28 are no longer engaged, the sleeve 19 is no longer limited, and the sleeve 19 rotates synchronously with the lead screw 24. At this time, the lens part of the camera assembly 15 will also extend out of the lower opening of the mounting tube 4. Step 3: Make the servo motor 12 drive the fan blade assembly 23 to rotate rapidly. At this time, the fan blade assembly 23 will draw in the outside air into the inside of the mounting tube 4. The air entering the mounting tube 4 will enter the inside of the camera assembly 15 through the air inlet 21 and the spring tube 17, and be discharged from the air outlet 20. This can increase the heat exchange of the inside and outside of the camera assembly 15, so as to efficiently dissipate heat from the electronic equipment inside the camera assembly 15. Step 4: The gas discharged from the vent 20 passes through the annular groove 30 and the one-way jet vent 31 in sequence and is discharged to the bottom of the mounting tube 4. During the process, since the axis of the one-way jet vent 31 is tangent to the axis of the inner bottom surface of the annular groove 30, and the axis of the one-way jet vent 31 is inclined outward from the axis of the mounting tube 4, an outwardly diffused vortex airflow will be formed below the mounting tube 4. This can reduce the possibility of dust or other dirt coming into contact with the lens, and avoid the lens being contaminated, which would lead to incorrect test results. In addition, the outward-spreading vortex airflow formed below the mounting tube 4 will also blow towards the carrier belt, thereby blowing away the dust adsorbed on the carrier belt and avoiding inaccurate test results due to dust remaining on the carrier belt. Step 4: After the inspection is completed, the servo motor 12 is started in reverse. The elastic potential energy accumulated by the spring 27 causes the T-shaped connecting block 26 and the connecting groove 28 to re-engage, and causes the sleeve 19 to move upward, which in turn drives the camera assembly 15 to move upward. During the process, the elastic potential energy accumulated by the torsion spring 7 causes the cover plate 8 to rotate in the opposite direction, thereby pressing the air cushion 13 into the inner side of the lower end of the mounting tube 4. Then, the camera assembly 15 continues to move upward, and a negative pressure will be generated between the air cushion 13 and the piston disc 14, so that the cover plate 8 can be stably adsorbed on the lower end of the mounting tube 4 to prevent dust from entering the interior of the mounting tube 4.

[0026] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A visual inspection module for carrier tape defects, comprising a mounting bracket (1) and a control panel (2) mounted on its surface, characterized in that: The mounting bracket (1) is provided with a support frame (3) inside, and the support frame (3) supports a mounting tube (4). The mounting tube (4) is provided with a camera assembly (15) inside, and a sealing and dustproof mechanism is connected to the camera assembly (15). The sealing and dustproof mechanism includes a piston disc (14) seamlessly slidably connected to the lower middle part of the mounting tube (4), and the lens part of the camera assembly (15) seamlessly passes through the piston disc (14) to its lower part. The camera assembly (15) is also connected with a displacement control mechanism, and the displacement control mechanism includes a sleeve (19) with a bearing connected to the upper end of the camera assembly (15). The upper end of the sleeve (19) is threaded with a lead screw (24), and the upper end of the lead screw (24) is connected with a heat dissipation and dustproof mechanism. The heat dissipation and dustproof mechanism includes a servo motor (12) connected to the top of the mounting tube (4) through a motor bracket (11). The top of the mounting tube (4) is provided with dense dustproof filter holes.

2. The carrier tape defect visual inspection module according to claim 1, characterized in that: The sealing and dustproof mechanism also includes a shaft core assembly (5) fixedly connected to the outside of the mounting tube (4), and a shaft sleeve (6) is provided on the outer bearing of the middle part of the shaft core assembly (5). Torsion springs (7) are provided between the two ends of the shaft sleeve (6) and the inner side of the shaft core assembly (5). A cover plate (8) is connected to the shaft sleeve (6), and an air cushion (13) is provided on the cover plate (8). Guide wheels (9) are provided on the mounting tube (4), cover plate (8), shaft sleeve (6) and camera assembly (15), and the guide wheels (9) are connected to each other by a steel wire rope (10). The guide wheels (9) on the mounting tube (4) and camera assembly (15) are fixedly connected to the two ends of the steel wire rope (10).

3. The carrier tape defect visual inspection module according to claim 2, characterized in that: The outer diameter of the cover plate (8) is greater than the outer diameter of the mounting tube (4), and the diameter of the air cushion (13) is between the inner diameter of the mounting tube (4) and the outer diameter of the cover plate (8).

4. The carrier tape defect visual inspection module according to claim 3, characterized in that: The displacement control mechanism also includes a limiting plate (16) fixedly connected inside the mounting tube (4), and two limiting rods (18) are symmetrically arranged on the limiting plate (16). The axis of the limiting rods (18) is parallel to the axis of the sleeve (19). An mounting block (22) is sleeved on the outer side of the upper end of the sleeve (19), and the mounting block (22) is movably penetrated by the upper ends of the two limiting rods (18). The upper and lower ends of the mounting block (22) are connected to the outer side of the sleeve (19) by bearing connection.

5. A carrier tape defect visual inspection module according to claim 4, characterized in that: The displacement control mechanism also includes two connecting grooves (28) that are equally distributed on the outer side of the upper end of the sleeve (19). The mounting block (22) is symmetrically provided with two cross grooves (25) that penetrate through its inner and outer sides. The position of the cross grooves (25) corresponds to the position of the connecting grooves (28). Each connecting groove (28) is penetrated by a corresponding T-shaped connecting block (26). The end size of the T-shaped connecting block (26) matches the size of the connecting groove (28) so that the end of the T-shaped connecting block (26) can be engaged inside the connecting groove (28).

6. The carrier tape defect visual inspection module according to claim 5, characterized in that: The displacement control mechanism also includes two sets of guide blocks (29) symmetrically arranged on the mounting block (22), and each set of guide blocks (29) has two. The two guide blocks (29) in the same set are symmetrically arranged about the axis center of the corresponding T-shaped connecting block (26). The guide blocks (29) are movably connected through the mounting block (22), and the strip channel opened on the mounting block (22) for the guide blocks (29) to move through is connected to the corresponding cross groove (25). Each guide block (29) is provided with a slanted through groove (32) that passes through both sides of it, and the slanted through groove (32) is a V-shaped structure. The middle part of the T-shaped connecting block (26) is provided with two symmetrical guide rods (33), and the two guide rods (33) on the same T-shaped connecting block (26) slide through the slanted through grooves (32) on the corresponding two guide blocks (29).

7. A carrier tape defect visual inspection module according to claim 6, characterized in that: The T-shaped connecting block (26) is also provided with a contact plate coaxial with it, and a spring (27) is provided between the contact plate and the inner side of the cross groove (25), and the spring (27) is sleeved on the outer side of the corresponding T-shaped connecting block (26).

8. A carrier tape defect visual inspection module according to claim 7, characterized in that: The heat dissipation and dust prevention mechanism also includes air inlets (21) symmetrically arranged on the limiting plate (16), and the air inlets (21) are arranged through both sides of the limiting plate (16). The air inlets (21) are connected to the inside of the camera assembly (15) through the corresponding spring tube (17). The camera assembly (15) is provided with air outlets (20) that penetrate through its inner and outer sides. The upper end of the lead screw (24) is coaxially connected to the fan blade assembly (23), and the fan blade assembly (23) is coaxially installed on the shaft end of the servo motor (12). The fan blade assembly (23) is located inside the mounting tube (4).

9. A carrier tape defect visual inspection module according to claim 8, characterized in that: The heat dissipation and dust prevention mechanism also includes an annular groove (30) disposed on the upper surface of the piston disc (14), and one-way jet holes (31) extending to the lower surface of the piston disc (14) are distributed at equal angles on the inner bottom surface of the annular groove (30). The axis of the one-way jet hole (31) is tangent to the axis of the inner bottom surface of the annular groove (30), and the axis of the one-way jet hole (31) is inclined outward from the axis of the mounting tube (4).

10. The detection method of a visual inspection module according to claim 9, characterized in that: Includes the following steps: Step 1: Fix the mounting bracket (1) onto the carrier belt machine so that the carrier belt passes under the mounting tube (4); Step 2: Start the servo motor (12) to drive the fan blade assembly (23) to rotate slowly. When the fan blade assembly (23) rotates, the lead screw (24) rotates slowly in sync. During the process, the sleeve (19) and the mounting block (22) are engaged and connected by the T-shaped connecting block (26) and the connecting groove (28), and the mounting block (22) is limited by the limiting rod (18), so the sleeve (19) is indirectly limited and cannot rotate. As a result, the sleeve (19) moves downward along its axis during the rotation of the lead screw (24). During the movement of the sleeve (19), the camera assembly (15) moves synchronously. During the movement of the camera assembly (15), the cover plate (8) is pulled open by the wire rope (10), and the torsion spring (7) accumulates elastic potential energy. When the guide block (29) moves to contact the limiting plate (16) and moves relative to the mounting block (22) due to compression, the T-shaped connecting block (26) can be gradually moved away from the connecting groove (28) through the oblique through groove (32) and the guide rod (33), and the spring (27) accumulates elastic potential energy. At this time, since the T-shaped connecting block (26) and the connecting groove (28) are no longer engaged, the sleeve (19) is no longer limited, and the sleeve (19) rotates synchronously with the lead screw (24). At this time, the lens part of the camera assembly (15) will also extend out of the lower opening of the mounting tube (4). Step 3: Make the servo motor (12) drive the fan blade assembly (23) to rotate rapidly. At this time, the fan blade assembly (23) will draw in the outside gas into the inside of the mounting tube (4). The gas entering the inside of the mounting tube (4) will enter the inside of the camera assembly (15) through the air inlet (21) and the spring tube (17) and be discharged from the air outlet (20). This can increase the heat exchange of the gas inside and outside the camera assembly (15) so as to facilitate efficient heat dissipation of the electronic equipment inside the camera assembly (15). Step 4: The gas discharged from the vent (20) passes through the annular groove (30) and the one-way jet hole (31) in sequence and is discharged to the bottom of the mounting tube (4). During the process, since the axis of the one-way jet hole (31) is tangent to the axis of the bottom surface of the annular groove (30), and the axis of the one-way jet hole (31) is inclined to the axis of the mounting tube (4) and set outward, an outward vortex airflow will be formed below the mounting tube (4), which can reduce the possibility of dust or other dirt coming into contact with the lens, and avoid the lens being contaminated, resulting in incorrect test results. In addition, the outward-spreading vortex airflow formed below the mounting tube (4) will also blow towards the carrier belt, thereby blowing away the dust adsorbed on the carrier belt, avoiding inaccurate test results due to dust remaining on the carrier belt. Step 4: After the inspection is completed, the servo motor (12) is started in reverse. The elastic potential energy accumulated by the spring (27) causes the T-shaped connecting block (26) and the connecting groove (28) to mesh again, and causes the sleeve (19) to move upward, which in turn drives the camera assembly (15) to move upward. During the process, the elastic potential energy accumulated by the torsion spring (7) causes the cover plate (8) to rotate in the opposite direction, so that the air cushion (13) can be pressed into the inner side of the lower end of the mounting tube (4). Then the camera assembly (15) continues to move upward, and a negative pressure will be generated between the air cushion (13) and the piston plate (14), so that the cover plate (8) can be stably adsorbed on the lower end of the mounting tube (4) to prevent dust from entering the interior of the mounting tube (4).

Images