3D-AOI detection machine Z-axis height automatic adjustment 3D detection head

Abstract

The utility model provides a kind of 3D detection head of 3D-AOI detection machine Z axis height automatic adjustment, it is related to 3D-AOI detection machine field including installation bottom plate for being installed on 3D-AOI detection machine equipment and servo motor with brake, the right side of the installation bottom plate is arranged with screw rod along its vertical height direction, the rod body of this screw rod is screwed with sliding table, the right side wall of the sliding table is equipped with adapter plate, 3D camera with different working distance can be compatible and installed on the adapter plate;The 3D detection head of 3D-AOI detection machine Z axis height automatic adjustment, with the characteristics of accurate focusing, component compatible, focusing without stopping, small space occupation and low gravity center, can greatly improve the stability of the whole 3D detection head mechanism operation, compatible installation different working distance 3D camera, without stopping adjusting 3D camera, can simplify installation debugging process, better realize the purpose of macro adjustment 3D camera usage height.

Description

Technical Field

[0001] This utility model relates to a 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine, belonging to the technical field of 3D-AOI inspection machine. Background Technology

[0002] 3D-AOI inspection equipment / machines are essential inspection equipment in SMT factories. They can be used to detect defects in PCBA boards. Currently, AOI used in SMT processing plants to inspect the quality of chip mounting and soldering includes so-called 2D and 3D AOI technologies. With the miniaturization, high density, and increasing complexity of electronic products, 3D-AOI relies on high-resolution cameras and optical systems to capture the details of the object being inspected. The height between the inspection head and the object being inspected, i.e., the working distance, must match the camera's focal length; otherwise, it will lead to blurred images and affect the accuracy of recognition. Modern production lines need to quickly switch between products of different specifications, such as PCB boards of different thicknesses and components with large height differences. The inspection head needs to dynamically adjust its height to adapt to different targets.

[0003] Currently, 3D inspection heads use high-frame-rate, high-speed industrial cameras plus 4- or 8-channel small-angle projection systems to eliminate small-pitch occlusion. The projection system is installed around the object being measured with a tilted and evenly distributed design, resulting in a large overall space requirement. The fixed working height and depth of field of the industrial camera lead to limited compatibility with the measured objects, resulting in several drawbacks: the head occupies a large overall space, resulting in low space utilization; compatibility issues arise when there are significant height differences between components, including camera replacement; installation and debugging are complex, with a long debugging cycle and relatively weak structural stability; and manual fine-tuning of the focus can lead to large errors, easily resulting in blurry images of the measured objects that are not clear.

[0004] Therefore, this application provides a 3D inspection head with automatic Z-axis height adjustment for 3D-AOI inspection machines to meet the requirements. Utility Model Content

[0005] (a) Technical problems to be solved The purpose of this utility model is to provide a 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine to solve the above-mentioned problems, thereby solving the technical problems of large overall space occupation, relatively weak structural stability, difficulty in compatibility or replacement of 3D cameras, complex installation and debugging, and large errors in manual fine-tuning of 3D camera focal length in the prior art.

[0006] (II) Technical Solution This utility model is achieved through the following technical solution: a 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine, including a mounting base plate for mounting on the 3D-AOI inspection machine equipment, and a servo motor vertically connected to the left side of the mounting base plate and equipped with a brake. A lead screw is arranged on the right side of the mounting base plate along its vertical height direction. A slide is screwed onto the body of the lead screw. An adapter plate is installed on the right side wall of the slide. The adapter plate can be compatible with 3D cameras with different working distances. A lower limit sensor for limiting the lowest downward position of the slide is installed on the outer side of the mounting base plate. An origin sensor for limiting the initial position of the slide is installed on the side wall of the mounting base plate, which is flush with the top surface of the adapter plate. An upper limit sensor for limiting the highest upward position of the slide is located directly above the origin sensor, and the upper limit sensor is installed on the side wall of the mounting base plate. The top of the lead screw is fitted with a first synchronous pulley, and the output shaft at the top of the servo motor is fitted with a second synchronous pulley. The second synchronous pulley is connected to the first synchronous pulley via a synchronous belt drive, thereby allowing the servo motor to drive the lead screw to change the position of the slide table to compensate for the working distance difference of the 3D camera and realize the detection of the height difference of products of different specifications.

[0007] Preferably, two sets of guide rails are arranged on the right side of the mounting base plate along its vertical height direction, and the two sets of guide rails are arranged on both sides of the lead screw. Slider blocks are installed at the front and rear positions of the bottom of the slide table, and the sliders slide along the extension direction of the guide rails at the corresponding positions to improve the stability of the slide table when moving along the Z-axis.

[0008] Preferably, an upper fixing seat is installed on the top right side of the mounting base plate, and a lower fixing seat is installed on the bottom right side of the mounting base plate. The lead screw passes vertically through the upper fixing seat and extends downward to be fixed to the top of the lower fixing seat.

[0009] Preferably, the upper fixed seat and the lower fixed seat are both provided with bearing seats at the point where the lead screw passes through and at the point where the lead screw is installed, and the right side wall of the upper or lower fixed seat is not attached to the left side of the adapter plate.

[0010] Preferably, a positioning pin is provided at the contact position between the left side wall of the mounting base plate and the equipment surface, which is used to allow the mounting base plate to be quickly installed on the equipment.

[0011] Preferably, the lead screw is a high-precision small-lead lead screw, and the vertical height of the lead screw body exceeds the vertical height of the mounting base plate.

[0012] Preferably, the top surfaces of the second synchronous pulley and the first synchronous pulley are on the same horizontal plane so that the servo motor can smoothly drive the lead screw.

[0013] This invention provides a 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine, which has the following beneficial effects: This 3D-AOI inspection machine features an automatically adjustable Z-axis 3D inspection head with precise focusing, component compatibility, non-stop focusing, small footprint, and low center of gravity. It utilizes a servo motor-driven rear-folding mounting method, saving horizontal and vertical mounting space on the base plate, lowering the center of gravity of the entire 3D inspection head mechanism, and significantly improving operational stability. Furthermore, 3D cameras with different working distances can be compatiblely mounted on the adapter plate. Without stopping the machine to adjust the 3D camera, the position of the lead screw can be quickly adjusted using the servo motor and synchronous belt to compensate for differences in the working distance of the 3D cameras, simplifying the installation and debugging process and better achieving the goal of adjusting the height of the 3D camera for macro purposes. It is compatible with various 3D cameras with different working distances and allows for quick replacement of 3D cameras with different precision levels, which is conducive to the widespread use of this 3D inspection head. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the 3D detection head of this utility model in its installation and use state; Figure 2 This is a schematic diagram of the combined structure of the mounting base plate, lead screw, and slide table of this utility model. Figure 3 This is a right view of the structure of the mounting base plate of this utility model; Figure 4 This is a partial enlarged structural diagram of the slide table of this utility model in its installed and used state.

[0015] [Explanation of Key Component Symbols] 1. Mounting base plate; 101. Positioning pin; 2. Guide rail; 3. Slide table; 301. Slider; 4. Lead screw; 401. Top of the screw; 402. Upper fixed seat; 403. Lower fixed seat; 5. Lower limit sensor; 6. Origin sensor; 7. Upper limit sensor; 8. Adapter plate; 9. 3D camera; 10. No. 1 synchronous pulley; 11. Servo motor; 12. No. 2 synchronous pulley; 13. Synchronous belt. Detailed Implementation

[0016] Please see Figure 1-4As shown, this utility model embodiment provides a 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine. It includes a mounting base plate 1 for mounting on the 3D-AOI inspection machine equipment, and a servo motor 11 vertically connected to the left side of the mounting base plate 1 and equipped with a brake. A lead screw 4 is arranged on the right side of the mounting base plate 1 along its vertical height direction. A slide 3 is screwed onto the body of the lead screw 4. An adapter plate 8 is mounted on the right side wall of the slide 3, which can be compatible with 3D cameras 9 with different working distances. A lower limit sensor 5 is installed on the outer side of the mounting base plate 1 to limit the lowest downward position of the slide 3. An origin sensor 6 is installed on the side wall of the mounting base plate 1, flush with the top surface of the adapter plate 8, to limit the initial position of the slide 3. Above the sensor 6 is an upper limit sensor 7 for limiting the highest upward position of the slide 3, and the upper limit sensor 7 is installed on the side wall of the mounting base plate 1; the lead screw 4 is a high-precision small lead screw, and the vertical height of the lead screw 4 exceeds the vertical height of the mounting base plate 1; the top end 401 of the lead screw 4 is sleeved with a first synchronous pulley 10, and the output shaft at the top of the servo motor 11 is sleeved with a second synchronous pulley 12. The second synchronous pulley 12 and the first synchronous pulley 10 are connected by a synchronous belt 13, so that the servo motor 11 drives the lead screw 4 to change the position of the slide 3 to compensate for the working distance difference of the 3D camera 9 to realize the detection of the height difference of products of different specifications. The top surfaces of the second synchronous pulley 12 and the first synchronous pulley 10 are on the same horizontal plane so that the servo motor 11 can smoothly drive the lead screw 4 to operate.

[0017] In this embodiment, two sets of guide rails 2 are arranged on the right side of the mounting base plate 1 along its vertical height direction. The two sets of guide rails 2 are correspondingly arranged on both sides of the lead screw 4. Slider 301 is installed at both the front and rear positions of the bottom of the slide table 3. The slider 301 slides along the extension direction of the corresponding guide rail 2 to improve the stability of the slide table 301 when moving in the Z-axis. The arrangement of the two sets of guide rails 2 allows the slider 301 to slide smoothly along the corresponding guide rail 2 when the slide table 3 moves in the Z-axis, thereby improving the overall stability of the slide table 3 when moving up and down. An upper fixed seat 402 is installed on the top right side of the mounting base plate 1, and a lower fixed seat 403 is installed on the bottom right side of the mounting base plate 1. The lead screw 4 passes vertically through the upper fixed seat 402 and extends downward to be fixed to the top of the lower fixed seat 403. Bearing seats are provided at the points where the lead screw 4 passes through the upper fixed seat 402 and the points where the lead screw 4 is installed in the lower fixed seat 403. The right side wall of the upper fixed seat 402 or the lower fixed seat 403 is not attached to the left side of the adapter plate 8. With the bearing seats, the lead screw 4 can be stably installed in the space formed between the upper fixed seat 402 and the lower fixed seat 403. The servo motor 11 drives the lead screw 4 to rotate, thereby driving the slide 3 to move up or down on the lead screw 4, thereby changing the position of the slide 3 on the lead screw 4, and then adjusting the usage position of the 3D camera 9 on the adapter plate 8. A positioning pin 101 is provided at the contact position between the left side wall of the mounting base plate 1 and the equipment surface. The positioning pin 101 is used to allow the mounting base plate 1 to be quickly installed on the equipment.

[0018] The 3D AOI inspection machine features an automatically adjustable Z-axis 3D inspection head. During operation, the servo motor 11 is directly mounted on the left side of the mounting base plate 1, meaning it is folded back onto the base plate 1. This lowers the center of gravity of the entire 3D inspection head mechanism and saves longitudinal mounting space on the base plate 1, playing a crucial role in the overall operational stability of the 3D inspection head. The use of a high-precision, small-lead lead screw 4 allows for better micro-adjustment, eliminating the need to stop the machine to adjust the 3D camera's height. The lead screw 4 allows for more convenient and precise adjustment of the 3D camera 9's height, resulting in clearer images. The 3D inspection head is equipped with upper limit sensors 7 and lower limit sensors 5 at both ends, with the origin sensor 6 located directly below the upper limit sensor 7. When the origin sensor 6 returns to zero, the 3D camera 9 moves upward, providing better operating space for the lower slide table 3. The upper limit sensor 7, lower limit sensor 5, and origin sensor 6 can be, but are not limited to, GL-8000 series limit sensors or E... The GT1 / 4A2000 German Ansner brand limit sensor or EE-SX series U-shaped photoelectric sensor, including the upper limit sensor 7, lower limit sensor 5, and origin sensor 6, uses commercially available technologies, and their structure and operating principles are not detailed here. The servo motor 11 and lead screw 4 mentioned are standard commercial models, and their structure and operating principles are also commercially available, so they are not detailed here. The servo motor 11 and lead screw 4 can form a lead screw motor or a lead screw stepper motor to control the upper movement of the slide table 3. The downward displacement, i.e., the lead screw stepper motor is a linear stepper motor, which is an actuator that converts electromagnetic pulses into linear displacement. Its core structure consists of a stepper motor / servo motor 11 and a lead screw 4 assembly. The magnetic rotor is driven to rotate by the pulse magnetic field generated by the stator winding. The conversion from rotation to linear motion is achieved by the engagement mechanism of the screw and nut. The slide 3 is moved linearly upward or downward along the extension direction of the lead screw 4 by the servo motor 11 to achieve the purpose of micro-adjusting the height of the 3D camera 9. Therefore, it will not be described in detail here.

[0019] In summary, this utility model utilizes a servo motor 11 with a rear-folding installation method, saving horizontal and vertical installation space on the mounting base plate 1, lowering the center of gravity of the entire 3D detection head mechanism, significantly improving the operational stability of the entire 3D detection head mechanism, and allowing 3D cameras 9 with different working distances to be compatiblely installed on the adapter plate 8. The position of the lead screw 4 can be quickly adjusted to compensate for the working distance difference of the 3D cameras 9 without stopping the machine to adjust the 3D cameras 9, simplifying the installation and debugging process, better achieving the purpose of micro-adjusting the working height of the 3D cameras 9, and being compatible with various 3D cameras with different working distances. This solves the technical problems of existing technologies, such as large overall head space occupation, relatively weak structural stability, difficulty in compatibility or replacement of 3D cameras 9, complex installation and debugging, and large focal length errors in manual micro-adjustment of the 3D cameras 9.

[0020] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine, comprising a mounting base plate (1) for mounting on a 3D-AOI inspection machine and a servo motor (11) vertically connected to the left side of the mounting base plate (1) and having its own brake, characterized in that: A lead screw (4) is arranged on the right side of the mounting base plate (1) along its vertical height direction. A slide (3) is screwed onto the body of the lead screw (4). An adapter plate (8) is installed on the right side wall of the slide (3). A 3D camera (9) with different working distances can be installed on the adapter plate (8). A lower limit sensor (5) for limiting the lowest downward position of the slide (3) is installed on the outer side of the mounting base plate (1). An origin sensor (6) for limiting the initial position of the slide (3) is installed on the side wall of the mounting base plate (1) flush with the top surface of the adapter plate (8). An upper limit sensor (7) for limiting the highest upward position of the slide (3) is provided directly above the origin sensor (6). The upper limit sensor (7) is installed on the side wall of the mounting base plate (1). The first synchronous pulley (10) is sleeved on the top end (401) of the lead screw (4), and the second synchronous pulley (12) is sleeved on the output shaft at the top of the servo motor (11). The second synchronous pulley (12) and the first synchronous pulley (10) are connected by a synchronous belt (13) so that the servo motor (11) drives the lead screw (4) to change the position of the slide (3) to compensate for the working distance difference of the 3D camera (9) and realize the detection of the height difference of products of different specifications.

2. The 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine according to claim 1, characterized in that: Two sets of guide rails (2) are arranged on the right side of the mounting base plate (1) along its vertical height direction. The two sets of guide rails (2) are arranged on both sides of the lead screw (4). Slider (301) is installed at the bottom front and rear positions of the slide table (3). The slider (301) slides along the extension direction of the guide rail (2) at the corresponding position to improve the stability of the slide table (301) when moving along the Z-axis.

3. The 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine according to claim 1, characterized in that: An upper fixing seat (402) is installed on the top right side of the mounting base plate (1), and a lower fixing seat (403) is installed on the bottom right side of the mounting base plate (1). The screw rod (4) passes vertically through the upper fixing seat (402) and extends downward to be fixed on the top of the lower fixing seat (403).

4. A 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine according to claim 3, characterized in that: The upper fixed seat (402) and the lower fixed seat (403) are both provided with bearing seats at the position where the lead screw (4) passes through and at the installation position of the lead screw (4). The right side wall of the upper fixed seat (402) or the lower fixed seat (403) is not attached to the left side of the adapter plate (8).

5. A 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine according to claim 1, characterized in that: A positioning pin (101) is provided at the contact position between the left side wall of the mounting base plate (1) and the surface of the equipment. The positioning pin (101) is used to allow the mounting base plate (1) to be quickly installed on the equipment.

6. A 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine according to claim 1, characterized in that: The lead screw (4) is a high-precision small lead screw, and the vertical height of the screw (4) exceeds the vertical height of the mounting base plate (1).

7. A 3D inspection head with automatic Z-axis height adjustment for a 3D-AOI inspection machine according to claim 1, characterized in that: The top surfaces of the second synchronous pulley (12) and the first synchronous pulley (10) are on the same horizontal plane so that the servo motor (11) can smoothly drive the lead screw (4) to rotate.

Images