AOI optical detection device for SMT

Abstract

The utility model discloses an AOI (Automatic Optic Inspection) device for SMT (Surface Mount Technology), which comprises a rack, a camera and a cleaning assembly, and is characterized in that the camera is arranged on the rack and is provided with a detection end; the cleaning assembly comprises a shell and a blowing part, the shell is arranged on the peripheral side of the camera, a gas flow channel is formed in the shell, a plurality of gas outlets communicated with the gas flow channel are formed in the shell, each gas outlet faces the detection end, the gas outlet end of the blowing part is communicated with the gas flow channel, and the gas outlet end of the blowing part is communicated with the gas flow channel. The air blowing piece is used for conveying air to the air flow channel. According to the technical scheme, dust on the detection end of the camera can be removed, the detection precision is improved, and the risks of false detection and missing detection are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of AOI detection, in particular to an AOI optical detection device for SMT. Background Art

[0002] In the manufacturing industry of surface mount technology (SMT), high-efficiency and high-precision automatic optical inspection (AOI) devices are essential to ensure the quality of printed circuit boards (PCBs). As electronic products develop towards high performance and miniaturization, PCB components are becoming more and more dense, which puts higher requirements on the detection capabilities of AOI devices. Therefore, AOI devices play an indispensable role in SMT production lines, used to detect solder joint defects, component misalignment, missing parts and other problems, to ensure the quality and reliability of electronic assembly.

[0003] Existing AOI technology mainly relies on fixed-position high-definition CCD cameras to capture images of PCB circuit boards, and then analyzes the inspection results through image processing software. However, these traditional AOI devices face the following disadvantages: after long-term operation, dust may accumulate on the camera lens, resulting in blurred images, reduced inspection accuracy, and increased risks of false detection and missed detection. This disadvantage limits the application efficiency and accuracy of existing AOI devices in high-density, high-precision circuit board inspection. Utility Model Content

[0004] The main purpose of the utility model is to provide an AOI optical inspection device for SMT, aiming to solve the technical problem that dust may accumulate on the lens of the camera of the existing AOI device.

[0005] To achieve the above-mentioned purpose, the utility model proposes an AOI optical inspection device for SMT, including a frame, a camera and a cleaning component, the camera is arranged on the frame, and the camera has a detection end; the cleaning component includes a shell and a blowing piece, the shell is arranged on the peripheral side of the camera, a gas flow channel is formed in the shell, and a plurality of gas outlets respectively connected to the gas flow channel are provided on the shell, each of the gas outlets is arranged toward the detection end, the gas outlet end of the blowing piece is connected to the gas flow channel, and the blowing piece is used to transport gas to the gas flow channel.

[0006] In a possible implementation, the detection end is formed at the end of the camera, and the shell is slidably disposed on the peripheral wall of the camera. The shell can move relative to the camera and can move to a cleaning position and an avoidance position. When the shell is in the cleaning position, the air outlet faces the detection end, and when the shell is in the avoidance position, the shell is located above the detection end.

[0007] In a possible embodiment, the shell is in a ring shape, and includes an outer arc wall and an inner arc wall that are relatively arranged, the gas flow channel is formed between the outer arc wall and the inner arc wall, the inner arc wall is slidably connected to the camera, and the multiple air outlets are all arranged on the inner arc wall, and the multiple air outlets are distributed in a ring shape on the inner arc wall.

[0008] In a possible implementation manner, the air outlet extends obliquely upward in a direction from the outer arc-shaped wall to the camera.

[0009] In a possible implementation scheme, a plurality of partitions are provided between the outer arc-shaped wall and the inner arc-shaped wall, each of the partitions extending in the length direction of the camera, and the plurality of partitions are spaced apart in the circumferential direction of the camera, and the plurality of partitions, the outer arc-shaped wall and the inner arc-shaped wall together enclose a plurality of sub-flow channels, each of the sub-flow channels is connected to the air outlet end of the blowing piece, and the plurality of sub-flow channels are arranged in one-to-one correspondence with the plurality of air outlets, the sub-flow channels are connected to the corresponding air outlets, and the sub-flow channels are arranged in a tapered direction from the air outlet end of the blowing piece to the corresponding air outlet.

[0010] In a possible implementation manner, the gas flow channel is connected to the gas outlet end of the blowing member through a pipeline.

[0011] The beneficial effects of this technical solution are reflected in multiple aspects. First, by adopting a movable shell and setting a blowing piece connected to the gas flow channel inside the shell, the dust on the camera detection end (i.e., the lens) can be effectively removed to maintain a clear field of view at the detection end. This is an obvious shortcoming in traditional technology, because traditional AOI equipment often ignores the negative impact of dust accumulation on the camera lens after long-term use on the detection accuracy.

[0012] In this solution, the shell design not only provides physical protection for the camera, preventing it from being directly exposed to an environment that may cause pollution, but also allows the multiple air outlets on the ring-shaped shell to evenly and effectively blow clean gas to the lens surface, ensuring that the camera remains in optimal working condition. In addition, the movable design of the shell means that when no cleaning operation is performed, it can be moved to a position that does not block the camera's line of sight. This not only enables the detection end to be quickly cleaned when needed, but also ensures the continuity and efficiency of the detection work, overcoming the shortcomings of traditional AOI devices that require manual cleaning or interruption of production due to cleaning work.

[0013] The design of multiple air outlets distributed in a ring further optimizes the cleaning effect because they can cover the surface of the camera lens in all directions without dead angles. Compared with the single-direction blowing method, this all-round cleaning is more thorough and greatly reduces the possibility of dust re-deposition. By integrating these innovative designs, this technical solution significantly improves the operating convenience, cleaning efficiency and detection accuracy of the AOI inspection device, and provides a more efficient and reliable solution for PCB inspection on SMT production lines, ensuring that the electronics manufacturing industry meets the needs of high-quality and high-precision production, while also reducing the risk of production delays and cost increases caused by improper maintenance of inspection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 This is a schematic structural diagram of an embodiment of the AOI optical inspection device for SMT of the utility model;

[0016] Figure 2 for Figure 1 A schematic diagram of the structure of the middle shell;

[0017] Figure 3 for Figure 2 Cross-sectional view of the middle shell.

[0018] Description of Figure Numbers:

[0019] 1. Rack; 2. Camera; 3. Cleaning assembly; 31. Shell; 311. Gas flow channel; 311a. Sub-flow channel; 312. Outer arc-shaped wall; 313. Inner arc-shaped wall; 313a. Air outlet; 314. Partition; 32. Blowing piece; 33. Pipeline.

[0020] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, which must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0024] The utility model provides an AOI optical detection device for SMT.

[0025] In the embodiment of the present utility model, Figures 1 to 3 As shown, the AOI optical inspection device for SMT includes a frame 1, a camera 2 and a cleaning component 3. The camera 2 is arranged on the frame 1, and the camera 2 has a detection end; the cleaning component 3 includes a shell 31 and a blowing member 32. The shell 31 is arranged on the peripheral side of the camera 2, and a gas flow channel 311 is formed in the shell 31. The shell 31 is provided with a plurality of gas outlets 313a respectively connected to the gas flow channel 311, and each gas outlet 313a is arranged toward the detection end. The gas outlet end of the blowing member 32 is connected to the gas flow channel 311, and the blowing member 32 is used to transport gas to the gas flow channel 311.

[0026] Firstly, the core of the device lies in the cleaning component 3, which comprises a shell 31 that fits tightly with the periphery of the camera 2, and an efficient blowing member 32. A gas flow channel 311 is designed inside the shell 31, and a plurality of gas outlets 313a are distributed thereon, which are directly facing the detection end of the camera 2. This design enables the cleaning component 3 to efficiently deliver clean gas to the detection end, thereby effectively removing dust or other tiny particles that may accumulate on the detection end.

[0027] By continuously or regularly cleaning the detection end of camera 2, its clarity is maintained, thereby ensuring high quality of image capture, reducing the risk of misjudgment due to lens contamination, and improving detection accuracy. The automatic cleaning mechanism reduces the need for manual cleaning of the camera 2 lens, avoids frequent manual maintenance and possible human error, reduces equipment downtime, and improves production efficiency.

[0028] As a key component of the AOI optical inspection device for SMT, the design and implementation of the air blowing member 32 are crucial to achieving effective and uniform cleaning functions. The following are some examples of implementation of the air blowing member 32:

[0029] An electric fan type air blowing member 32 , this type of air blowing member 32 generates airflow through a built-in small electric fan, and the airflow is guided to the air outlet 313 a through a gas flow channel 311 connected to the air blowing member 32 , and directly blows toward the detection end of the camera 2 .

[0030] Compressed air jet blowing member 32: Using compressed air as a cleaning medium, the blowing member 32 powerfully ejects the compressed air through a precisely controlled nozzle.

[0031] The detection end is formed at the end of the camera 2, and the shell 31 can be slidably disposed on the peripheral wall of the camera 2. The shell 31 can move relative to the camera 2 and can move to a cleaning position and an avoidance position. When the shell 31 is in the cleaning position, the air outlet 313a faces the detection end. When the shell 31 is in the avoidance position, the shell 31 is located above the detection end.

[0032] The housing 31 is slidable to realize free switching between the cleaning position and the avoidance position. This design brings two significant technical effects. First, when the housing 31 is in the avoidance position, it not only avoids any obstruction of the detection end of the camera 2, ensuring the interference-free AOI detection, but also the micro-vibration generated during the movement of the housing 31 has a certain cleaning effect on the dust on the detection end of the camera 2. This non-contact self-cleaning method can reduce the influence of dust on the detection accuracy to a certain extent.

[0033] Secondly, when the housing 31 is moved to the cleaning position, the air outlet 313a is directly facing the detection end, and targeted cleaning operations can be performed to effectively remove dust and pollutants on the detection end, further improving the accuracy and reliability of the detection. This design not only optimizes the maintenance and maintenance process of the equipment, reduces the complexity of operation and maintenance costs, but also enhances the service life and stability of the equipment, providing a strong technical guarantee for ensuring high-efficiency and high-quality PCB detection on the SMT production line.

[0034] In specific implementation, there are several ways of sliding connection between the housing 31 and the camera 2:

[0035] By setting a linear guide rail around the camera 2, the shell 31 slides through a slider or roller that cooperates with the guide rail; alternatively, a ball bearing is installed between the shell 31 and the camera 2, and the ball bearing can roll freely on its internal track, thereby achieving smooth sliding of the shell 31 relative to the camera 2; alternatively, the shell 31 is connected to the camera 2 through a flexible hanging chain, and the hanging chain drives the shell 31 to move along a predetermined path during the stretching or contraction process.

[0036] The shell 31 is ring-shaped, and includes an outer arc-shaped wall 312 and an inner arc-shaped wall 313 that are relatively arranged. The gas flow channel 311 is formed between the outer arc-shaped wall 312 and the inner arc-shaped wall 313. The inner arc-shaped wall 313 is slidably connected to the camera 2. Multiple air outlets 313a are all arranged on the inner arc-shaped wall 313, and the multiple air outlets 313a are distributed in a ring shape on the inner arc-shaped wall 313.

[0037] The annular design of the shell 31 tightly surrounds the periphery of the camera 2. This structure not only naturally adapts to the shape of the camera 2 and enhances the structural stability of the entire device, but also achieves all-round cleaning protection for the detection end while ensuring that the normal operation of the camera 2 is not affected. The air outlet 313a distributed in a ring along the inner arc wall 313 ensures that the clean gas delivered from the blowing piece 32 can evenly and comprehensively cover the detection end of the camera 2. This evenly distributed air outlet 313a not only improves the cleaning efficiency and ensures that every corner can be effectively cleaned, but also reduces the potential risk of damage caused by uneven cleaning.

[0038] The air outlet 313 a extends obliquely upward from the outer arc-shaped wall 312 in a direction toward the camera 2 .

[0039] The upward tilted design of the air outlet 313a allows the clean gas to form an upward airflow when it is blown toward the detection end of the camera 2. This airflow direction helps to blow dust and other pollutants off the surface of the detection end more effectively and prevent these particles from falling back into the detection end or the surrounding area. Compared with blowing directly toward or horizontally, this tilted blowing method can more thoroughly remove accumulated dust, thereby maintaining the cleanliness of the detection end of the camera 2 and ensuring high-quality image capture and detection accuracy.

[0040] Secondly, the design of the upwardly inclined air outlet 313a also takes into account the protection of the detection end of the camera 2. During the cleaning process, the inclined direction of the airflow reduces the direct impact force on the mirror surface of the camera 2. This gentle cleaning method helps to prevent potential scratches or damage to the mirror surface of the camera 2. This protection is particularly important for the high-precision camera 2.

[0041] A plurality of partitions 314 are provided between the outer arc-shaped wall 312 and the inner arc-shaped wall 313, each partition 314 extends in the length direction of the camera 2, and the plurality of partitions 314 are spaced apart in the circumferential direction of the camera 2. The plurality of partitions 314, the outer arc-shaped wall 312 and the inner arc-shaped wall 313 together enclose a plurality of sub-channels 311a, and each sub-channel 311a is connected to the air outlet end of the blowing piece 32. The plurality of sub-channels 311a are arranged in one-to-one correspondence with the plurality of air outlets 313a, and the sub-channels 311a are connected to the corresponding air outlets 313a, and the sub-channels 311a are arranged in a gradually contracting direction from the air outlet end of the blowing piece 32 to the corresponding air outlet 313a.

[0042] The core technical effect of this tapered design is that it can significantly increase the gas flow rate through the sub-channel 311a, thereby enhancing the efficiency of the clean gas in removing dust and pollutants at the detection end of the camera 2.

[0043] First, the design of the tapered sub-channel 311a is based on the principles of fluid dynamics. When the gas passes through the tapered channel, its flow rate will increase as the cross-sectional area of ​​the channel decreases. This design allows the gas to obtain a higher flow rate in the area close to the outlet 313a, so that it has a stronger impact force and decontamination ability when blowing toward the detection end of the camera 2, which is crucial for removing stubborn dust particles or other contaminants adhering to the detection end, and can ensure the high cleanliness of the detection end, thereby ensuring the clarity of the detection image and the accuracy of the detection results.

[0044] Secondly, by optimizing the gas flow rate, the tapered design also helps to improve cleaning efficiency and reduce the amount of gas required during the cleaning process, which not only reduces the energy consumption of equipment operation, but also reduces the demand for compressed air or other clean gas resources, thereby reducing the operating cost of the equipment.

[0045] The gas flow channel 311 is connected to the gas outlet of the blowing member 32 through the pipe 33. The design of direct connection through the pipe 33 enhances the flexibility of the system. According to different cleaning requirements, the length or diameter of the pipe 33 and the type and parameters of the blowing member 32 can be adjusted to flexibly adjust the gas delivery efficiency and cleaning intensity to meet the needs of production lines of different types and scales, thereby improving the scope of application and flexibility of the equipment.

[0046] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An AOI optical inspection device for SMT, characterized in that: include: Rack (1); A camera (2) is arranged on the frame (1), and the camera (2) has a detection end; A cleaning component (3) comprises a shell (31) and a blowing member (32), wherein the shell (31) is arranged on the peripheral side of the camera (2), a gas flow channel (311) is formed in the shell (31), a plurality of gas outlets (313a) respectively connected to the gas flow channel (311) are provided on the shell (31), each of the gas outlets (313a) is arranged toward the detection end, the gas outlet end of the blowing member (32) is connected to the gas flow channel (311), and the blowing member (32) is used to transport gas to the gas flow channel (311).

2. The AOI optical inspection device for SMT according to claim 1, characterized in that: The detection end is formed at the end of the camera (2); the shell (31) is slidably disposed on the peripheral wall of the camera (2); the shell (31) is movable relative to the camera (2) and is movable to a cleaning position and an avoidance position; when the shell (31) is in the cleaning position, the air outlet (313a) faces the detection end; when the shell (31) is in the avoidance position, the shell (31) is located above the detection end.

3. The AOI optical inspection device for SMT according to claim 2, characterized in that: The shell (31) is in a ring shape, and comprises an outer arc-shaped wall (312) and an inner arc-shaped wall (313) which are arranged opposite to each other. The gas flow channel (311) is formed between the outer arc-shaped wall (312) and the inner arc-shaped wall (313). The inner arc-shaped wall (313) is slidably connected to the camera (2). The multiple gas outlets (313a) are all arranged on the inner arc-shaped wall (313), and the multiple gas outlets (313a) are distributed in a ring shape on the inner arc-shaped wall (313).

4. The AOI optical inspection device for SMT according to claim 3, characterized in that: The air outlet (313a) extends obliquely upward in the direction from the outer arc-shaped wall (312) to the camera (2).

5. The AOI optical inspection device for SMT according to claim 3, characterized in that: A plurality of partitions (314) are provided between the outer arc-shaped wall (312) and the inner arc-shaped wall (313); each of the partitions (314) extends in the length direction of the camera (2); the plurality of partitions (314) are spaced apart in the circumferential direction of the camera (2); the plurality of partitions (314), the outer arc-shaped wall (312) and the inner arc-shaped wall (313) together enclose a plurality of sub-flow channels (311a); each of the sub-flow channels (311a) is connected to the air outlet end of the air blowing member (32); the plurality of sub-flow channels (311a) and the plurality of air outlets (313a) are arranged in one-to-one correspondence; the sub-flow channels (311a) are connected to the corresponding air outlets (313a); and the sub-flow channels (311a) are arranged in a gradually contracting direction from the air outlet end of the air blowing member (32) to the corresponding air outlets (313a).

6. The AOI optical inspection device for SMT according to claim 1, characterized in that: The gas flow channel (311) is connected to the gas outlet end of the blowing member (32) through a pipeline (33).

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