Auxiliary device for detecting shadow of AOI (Automatic Optic Inspection) equipment

Abstract

The utility model relates to the technical field of circuit board detection, in particular to an AOI equipment shadow detection auxiliary device which comprises a transportation assembly and two fixing tables arranged on the two sides of the transportation assembly respectively, the tops of the two fixing tables are jointly and fixedly connected with a door-shaped frame, and the tops of the two outer side walls of the door-shaped frame are both fixedly connected with servo motors. The output end of the servo motor penetrates through the outer side wall of the door-shaped frame and is fixedly connected with a lead screw through a coupler, the outer portion of the lead screw is in threaded connection with a sliding block, and the bottom of the sliding block is fixedly connected with an electric telescopic rod. The circuit board can be accurately adsorbed from the fixing table and transferred into the limiting frame of the conveying assembly, the position accuracy of the circuit board in the detection process is ensured, the problem that shadow interferes with detection due to position deviation is avoided, and the accuracy of a detection result is greatly improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of circuit board detection, in particular to an auxiliary device for AOI equipment shadow detection. BACKGROUND

[0002] AOI is a new test technology emerging in recent years. When automatically detected, a machine automatically scans a PCB through a camera, collects images, compares test solder joints with qualified parameters in a database, checks defects on the PCB through image processing, and displays the defects through a display or automatic marking for repair personnel to repair.

[0003] For the related technologies described above, the inventors believe that the detection method in the prior art is inefficient when dealing with shadow interference of the circuit board. On the one hand, the circuit board is prone to position deviation during transportation and detection, which changes the coverage of the detection area by the shadow, resulting in inaccurate detection results. On the other hand, the existing auxiliary device cannot flexibly and efficiently transfer the circuit board between different positions, affecting the smoothness and automation degree of the detection process, and cannot meet the large-scale and high-precision production and detection requirements. Therefore, in order to solve the above problems, the application provides an auxiliary device for AOI equipment shadow detection. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problems raised in the background, the application provides an auxiliary device for AOI equipment shadow detection.

[0005] The auxiliary device for AOI equipment shadow detection provided by the application comprises a transportation assembly and two fixed tables arranged on the two sides of the transportation assembly, the top portions of the two fixed tables are fixedly connected with a door-shaped frame, the top portions of the two outer side walls of the door-shaped frame are fixedly connected with servo motors, the output ends of the servo motors penetrate the outer side walls of the door-shaped frame and are fixedly connected with lead screws through couplings, the outer threads of the lead screws are connected with sliding blocks, the bottom portions of the sliding blocks are fixedly connected with electric telescopic rods, the output ends of the electric telescopic rods are fixedly connected with a horizontal plate, and vacuum suction pads are installed at the four corner portions of the bottom portion of the horizontal plate.

[0006] Preferably, the ends of the two lead screws away from the servo motors are rotatably connected with fixed blocks through bearings, the two fixed blocks are fixedly connected to the top inner wall of the door-shaped frame, and a detection device is installed on the top inner wall of the door-shaped frame between the two fixed blocks.

[0007] Preferably, the surface of the transportation assembly is provided with a plurality of limiting frames for position limiting of the circuit board.

[0008] Preferably, the surfaces of the two fixed tables are provided with placement areas for placing the circuit board.

[0009] Preferably, the top of each of the two sliding blocks is tightly fitted with the inner wall of the top of the door-shaped frame.

[0010] In summary, the present application has the following beneficial technical effects:

[0011] 1. The servo motor drives the lead screw, which drives the sliding block and the electric telescopic rod, the cross plate and the vacuum adsorption pad connected below to move, which can accurately adsorb and transfer the circuit board from the fixed table to the limiting frame of the transportation assembly, ensuring the position accuracy of the circuit board during detection, avoiding the problem of shadow interference detection caused by position deviation, and greatly improving the accuracy of the detection result.

[0012] 2. The device realizes automatic transfer of the circuit board between different positions, that is, one electric telescopic rod drives the vacuum adsorption pad to adsorb the circuit board on the left fixed table, the lead screw rotates and moves to the limiting frame to be detected by the detection equipment, after detection is completed, the other electric telescopic rod drives the vacuum adsorption pad to adsorb the circuit board and transport it to the other fixed table, reducing the manual operation link and improving the detection efficiency, meeting the requirements of modern large-scale production for automatic detection process. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a front view structural schematic diagram of an auxiliary device for detecting shadow of an AOI equipment according to an embodiment of the present application;

[0014] Figure 2 is a schematic diagram of the overall structure of an auxiliary device for detecting shadow of an AOI equipment according to an embodiment of the present application;

[0015] Figure 3 is Figure 2 is an enlarged schematic diagram of structure A in FIG. 1;

[0016] Figure 4 is Figure 2 is an enlarged schematic diagram of structure B in FIG. 1.

[0017] Reference signs: 1, transportation assembly; 2, fixed table; 3, door-shaped frame; 4, servo motor; 5, lead screw; 6, sliding block; 7, electric telescopic rod; 8, cross plate; 9, vacuum adsorption pad; 10, fixed block; 11, detection equipment; 12, limiting frame; 13, placement area. DETAILED DESCRIPTION

[0018] The following will be described in detail in combination with the accompanying Figure 1 - Figure 4 The present application will be further described in detail.

[0019] Example 1:

[0020] An auxiliary device for detecting shadow of an AOI equipment, referring to Figure 1 -Figure 4 , including the transport assembly 1 and two fixed tables 2 respectively arranged on both sides of the transport assembly 1, the top of the two fixed tables 2 is fixedly connected with a door-shaped frame 3, the top of the two outer side walls of the door-shaped frame 3 is fixedly connected with a servo motor 4, the output end of the servo motor 4 penetrates the outer side wall of the door-shaped frame 3 and is fixedly connected with a lead screw 5 through a shaft coupling, the outer thread of the lead screw 5 is connected with a sliding block 6, the top of the two sliding blocks 6 is tightly attached to the inner wall of the top of the door-shaped frame 3, the bottom of the sliding block 6 is fixedly connected with an electric telescopic rod 7, the output end of the electric telescopic rod 7 is fixedly connected with a horizontal plate 8, and the vacuum adsorption pad 9 is installed at the bottom of the four corners of the horizontal plate 8.

[0021] Specifically, the transport assembly 1 is used to carry and transport the circuit board, the fixed tables 2 on both sides are used to place the circuit boards to be detected and the circuit boards that have been detected, the door-shaped frame 3 is horizontally arranged above the transport assembly 1 to provide mounting support for other components, the servo motor 4 is installed at the top of the outer side wall of the door-shaped frame 3 and can output rotary power after being powered on, the lead screw 5 is fixedly connected with the output end of the servo motor 4 through the shaft coupling, when the servo motor 4 rotates, the lead screw 5 rotates, the sliding block 6 is threadedly connected with the lead screw 5, when the lead screw 5 rotates, the sliding block 6 moves linearly along the lead screw 5, the electric telescopic rod 7 is installed at the bottom of the sliding block 6 and can be controlled to stretch and retract through an electric signal, when the electric telescopic rod 7 stretches or retracts, the horizontal plate 8 connected below moves up and down, and the vacuum adsorption pad 9 at the bottom of the four corners of the horizontal plate 8 can adsorb the circuit board by using atmospheric pressure when a vacuum is formed inside, when the lead screw 5 drives the sliding block 6 to move, the closely attached structure can guide and stabilize the sliding block 6 to prevent the sliding block 6 from shaking or deviating during movement.

[0022] Referring to Figure 2 , the ends of the two lead screws 5 away from the servo motor 4 are rotatably connected with a fixed block 10 through a bearing, the two fixed blocks 10 are fixedly connected to the top inner wall of the door-shaped frame 3, and the detection equipment 11 is installed on the top inner wall of the door-shaped frame 3 and between the two fixed blocks 10.

[0023] Specifically, the two screw rods 5 are rotatably connected to the fixed blocks 10 at the ends away from the servo motor 4 through bearings, and the fixed blocks 10 are fixed to the inner wall of the top of the door-shaped frame 3, which ensures the stability of the rotation of the screw rods 5. The detection device 11 is installed on the inner wall of the top of the door-shaped frame 3 and located between the two fixed blocks 10. When the circuit board is transferred into the limiting frame 12 on the transportation assembly 1, the detection device 11 can detect the circuit board. During the movement of the sliding block 6 driven by the rotation of the screw rod 5, the vacuum adsorption pad 9 adsorbing the circuit board can be accurately moved to the appropriate position below the detection device 11, facilitating the accurate detection of the circuit board by the detection device 11. The detection device 11 usually works based on optical imaging and image analysis technology. When the circuit board is transferred into the limiting frame 12 of the transportation assembly 1 by the vacuum adsorption pad 9 and reaches the designated position below the detection device 11, the detection device 11 turns on the light source to project light onto the surface of the circuit board. The light reflected or transmitted by the circuit board is captured by the image acquisition element in the detection device 11, such as a CCD (Charge-Coupled Device) camera. The camera converts the light signal into an electrical signal and further generates digital image information.

[0024] With reference to Figure 1 , the surface of the transportation assembly 1 is provided with a plurality of limiting frames 12 for positioning the circuit board.

[0025] Specifically, when the vacuum adsorption pad 9 adsorbs and transfers the circuit board from the fixed table 2 to the transportation assembly 1, the limiting frame 12 can ensure that the circuit board is in the accurate detection position, avoiding the position deviation of the circuit board on the transportation assembly 1 and ensuring the accuracy of the detection. At the same time, a plurality of limiting frames 12 can sequentially carry different circuit boards, cooperating with the automatic transfer function of the device to realize continuous detection and improve the detection efficiency.

[0026] With reference to Figure 1 , the surface of each of the two fixed tables 2 is provided with a placement area 13 for placing the circuit board.

[0027] Specifically, the placement area 13 provided on the surface of each of the two fixed tables 2 is specially used for placing the circuit board. The operator can place the circuit board to be detected in the placement area 13, which facilitates the pickup of the vacuum adsorption pad 9. The circuit board after detection can also be placed in the placement area 13, which facilitates subsequent arrangement and processing. The placement area 13 provides a stable initial placement and final placement position for the circuit board, ensuring the orderly progress of the entire detection process.

[0028] The implementation principle of the auxiliary device for detecting shadow of the AOI equipment provided by the embodiment of the application is as follows: the servo motor 4 is preferably HBS57 type, and the electric telescopic rod 7 is preferably LX600 type; the servo motor 4 and the electric telescopic rod 7 are electrically connected with an external power supply through switches; when the auxiliary device for detecting shadow of the AOI equipment works, the conveying assembly 1 is responsible for carrying and conveying the circuit board, the fixed tables 2 on the two sides of the conveying assembly 1 are provided with special placement areas 13 for placing the circuit board to be detected and the circuit board that has been detected, the door-shaped frame 3 is horizontally arranged above the conveying assembly 1 to provide support for the whole device; the servo motor 4 is started through the switch, and drives the screw rod 5 connected with the servo motor 4 through a coupling to rotate; the threads on the outer surface of the screw rod 5 are arranged at an angle of 20 degrees, and the self-locking condition needs to meet the following formula calculation: self-locking condition = friction coefficient x tan (screw angle) >= 1; the sliding block 6 connected with the screw rod 5 through threads moves linearly along the screw rod 5 when the screw rod 5 rotates, and the top of the sliding block 6 is tightly attached to the inner wall of the top of the door-shaped frame 3 to ensure the stability of the movement; the electric telescopic rod 7 is started through the switch, and moves up and down through the control of electric signals, and drives the lower horizontal plate 8 to move up and down; when the inside of the vacuum adsorption pad 9 at the bottom of the four corners of the horizontal plate 8 forms a vacuum, the circuit board is adsorbed by using the atmospheric pressure; when the circuit board needs to be detected, one of the vacuum adsorption pads 9 adsorbs the circuit board to be detected from the placement area 13 of the fixed table 2; the servo motor 4 rotates to drive the screw rod 5 to move the sliding block 6, so as to transfer the circuit board to the limiting frame 12 on the surface of the conveying assembly 1; the limiting frame 12 ensures that the circuit board is in the accurate detection position and avoids deviation; at this time, the detection equipment 11 between the two fixed blocks 10 on the top inner wall of the door-shaped frame 3 starts to work; the detection equipment 11 based on the optical imaging and image analysis technology turns on the light source to project light to the circuit board; the light is reflected or transmitted by the circuit board, and then is captured by the internal image acquisition element such as a CCD camera, is converted into an electric signal and generates digital image information, and then analyzes whether the circuit board has shadow and other abnormalities; after the detection is completed, the other vacuum adsorption pad 9 adsorbs the circuit board from the limiting frame 12 and transfers the circuit board to the placement area 13 of the other fixed table 2, so as to complete the whole detection process; and the multiple limiting frames 12 cooperate with the automatic transfer function to realize continuous detection and improve the detection efficiency.

[0029] The above describes the exemplary implementation of the auxiliary device for detecting shadow of the AOI equipment provided by the present disclosure with reference to the preferred embodiment, however, those skilled in the art can understand that various modifications and changes can be made to the above specific embodiments, and various technical features and structures proposed by the present disclosure can be combined without departing from the concept of the present disclosure, and the protection scope of the present disclosure is determined by the appended claims.

Claims

1. An auxiliary device for AOI equipment to detect shadow, comprising a conveying assembly (1) and two fixed tables (2) respectively arranged on both sides of the conveying assembly (1), characterized in that: The top portions of the two fixing tables (2) are fixedly connected with a door-shaped frame (3), the top portions of the two outer side walls of the door-shaped frame (3) are fixedly connected with servo motors (4), the output ends of the servo motors (4) penetrate through the outer side walls of the door-shaped frame (3) and are fixedly connected with lead screws (5) through couplings, the outer portions of the lead screws (5) are threadedly connected with sliding blocks (6), the bottom portions of the sliding blocks (6) are fixedly connected with electric telescopic rods (7), the output ends of the electric telescopic rods (7) are fixedly connected with horizontal plates (8), and the bottom portions of the four corners of the horizontal plates (8) are all provided with vacuum adsorption pads (9).

2. The auxiliary device for detecting shadow of an AOI equipment according to claim 1, wherein: The distal ends of the two lead screws (5) away from the servo motors (4) are all rotatably connected with fixing blocks (10) through bearings, the two fixing blocks (10) are both fixedly connected to the top inner wall of the door-shaped frame (3), and a detection device (11) is installed on the top inner wall of the door-shaped frame (3) and located between the two fixing blocks (10).

3. The auxiliary device for detecting shadow of an AOI equipment according to claim 1, wherein: The surface of the conveying assembly (1) is provided with a plurality of limiting frames (12) for positionally limiting circuit boards.

4. The auxiliary device for detecting shadow of an AOI equipment according to claim 1, wherein: The surfaces of the two fixing tables (2) are both provided with placing areas (13) for placing circuit boards.

5. The auxiliary device for detecting shadow of an AOI equipment according to claim 1, wherein: The top portions of the two sliding blocks (6) are tightly attached to the top inner wall of the door-shaped frame (3).

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