Calibration device of welding spot detection equipment

Abstract

The utility model relates to a calibration device of welding spot detection equipment, which is arranged below a movement area of a detection machine head of the welding spot detection equipment and is used for assisting online calibration of the detection machine head. An image capturing device, a force control shifting device with a shifting needle and a laser displacement sensor are arranged on the detection machine head; the calibration device is provided with a fixed seat, a visual unit, a calibration unit and a measuring unit, wherein the visual unit is arranged on the fixed seat and is used for detecting the relative position difference of each detection component of the machine head in X / Y-direction coordinates; the calibration unit is used for calibrating the force control repetition precision and true value of a dial needle; the measuring unit is used for measuring the relative coordinate position of a laser displacement sensor in a Z direction; according to the calibration device of the welding spot detection equipment, manual calibration is replaced by a machine, the speed is high, the efficiency is high, online calibration is met, and production is promoted.

Description

Technical Field

[0001] This utility model relates to the field of industrial visual inspection technology, and in particular to visual inspection equipment for weld joint inspection. Background Technology

[0002] In the 3C electronics industry, there are frequent situations where components need to be soldered to circuit boards. After soldering, the solder joints need to be inspected. Traditionally, this is done by workers visually inspecting the solder joints or solder balls. This manual inspection method suffers from low accuracy, low efficiency, and poor results, and also leads to high labor intensity for workers and high labor costs for companies. Later, to address the issue of automated inspection, some CCD vision inspection equipment was developed. This type of equipment mounts a CCD vision camera directly above the inspection station. When IC electronic components are placed in the inspection station, the camera captures the solder joints for comparison or inspection. However, in actual inspection, if there are false solder joints or poor solder joints, visual inspection alone is sometimes insufficient. In such cases, manual inspection by poking is still required, which cannot meet the requirements of automated inspection and affects the production process. To address this, the applicant has proposed an inspection head equipped with an image capture device, a force-controlled actuator with a pin, and a laser displacement sensor to achieve visual inspection, pin detection, and laser displacement alignment in conjunction with the downward movement of the pin. However, in actual production, due to errors, loosening, and wear of the mechanical structure, the inspection head needs to be calibrated. Currently, calibration is performed manually after the machine is stopped, which is inefficient and affects the production process. Summary of the Invention

[0003] The purpose of this invention is to provide a calibration device for solder joint testing equipment. The machine replaces manual calibration, which is fast, efficient, and meets the requirements for online calibration, thus promoting production.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A calibration device for solder joint inspection equipment is located below the moving area of ​​the inspection head of the solder joint inspection equipment to assist in online calibration of the inspection head; the inspection head is equipped with an image capture device, a force control actuator with a pin, and a laser displacement sensor.

[0006] The calibration device includes a fixed base and a vision unit mounted on the fixed base for measuring the relative position difference of each detection component of the detection head in the X / Y coordinates, a calibration unit for calibrating the force control repeatability and true value of the needle, and a measurement unit for measuring the relative coordinate position of the laser displacement sensor in the Z direction. The vision unit acquires images and, using existing visual inspection principles, analyzes and processes the images to obtain the relative position difference of each detection component in the X / Y coordinates. The calibration unit includes a force sensor and an elastic rod connected to the force sensor. The needle on the detection head moves the elastic rod, and the elastic rod outputs a force signal to the force sensor, which is then transmitted to the computer for calibration of the force control repeatability and true value of the needle. The measurement unit is a block-shaped standard component with a corresponding height difference structure.

[0007] The above solution is further described as follows: the fixing base is a square frame that is set vertically, so that the upper end of the fixing base has a vertically upward functional window, and three supporting columns are provided inside the fixing base. The vision unit, calibration unit and measurement unit are respectively assembled on the three supporting columns, and the vision unit, calibration unit and measurement unit are exposed together from the functional window.

[0008] The above scheme is further described in that each support column is provided with a slide rail that slides in the Z direction, and the vision unit, calibration unit and measurement unit are respectively fixed on the slide rail of the corresponding support column. The installation height of the vision unit, calibration unit or measurement unit is adjusted by sliding the slide rail in the Z direction.

[0009] A further improvement in the above scheme is that the slide rail is a dovetail slide rail, and a scale is provided on the slide rail.

[0010] This invention designs a calibration device for a solder joint inspection equipment, equipped with a vision unit for measuring the relative position difference of each inspection component of the inspection head in the X / Y coordinates, a calibration unit for calibrating the force control repeatability and true value of the pin, and a measurement unit for measuring the relative coordinate position of the laser displacement sensor in the Z direction; achieving machine-based calibration instead of manual calibration, with high speed and efficiency, and meeting online calibration requirements, thus promoting production. Attached Figure Description

[0011] Appendix Figure 1 This is a schematic diagram of a preferred embodiment of the present invention;

[0012] Appendix Figure 2 for Figure 1 Enlarged schematic diagram of a partial structure in the embodiment;

[0013] Appendix Figure 3 for Figure 1 A schematic diagram of the embodiment combined with the solder joint inspection equipment;

[0014] Appendix Figure 4 for Figure 3 A schematic diagram of the inspection head structure on the solder joint inspection equipment in this embodiment. Detailed Implementation

[0015] The following will further explain the concept, specific structure and technical effects of the utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the utility model.

[0016] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0017] See Figure 1 , 2 Figure 3 shows a schematic diagram of a preferred embodiment of the present invention. The present invention relates to a calibration device for a solder joint inspection equipment. The calibration device 1 has a fixed base 14 and a vision unit 11 mounted on the fixed base for measuring the relative position difference of each inspection component of the inspection head in the X / Y coordinate direction, a calibration unit 12 for calibrating the force control repeatability and true value of the pin, and a measurement unit 13 for measuring the relative coordinate position of the laser displacement sensor in the Z direction. The vision unit 11 acquires images and, with the aid of existing visual inspection principles, performs image analysis and processing to obtain the relative position difference of each inspection component in the X / Y coordinate direction. The vision unit 11 is preferably an industrial camera, which takes pictures to obtain planar images of each inspection component of the inspection head, and then obtains the relative position difference of each inspection component in the X / Y coordinate direction through visual inspection, thereby performing calibration. The calibration unit 12 includes a force sensor 121 and an elastic rod 122 connected to the force sensor. A pin on the detection head moves the elastic rod 122, and the elastic rod 122 outputs a force signal to the force sensor 121, which is then transmitted to the computer. Based on this, the repeatability and true value of the pin's force control are calibrated, achieving automatic detection and easy control. The measurement unit 13 is a block-shaped standard component with a corresponding height difference structure, allowing the laser displacement sensor to measure the height of the detection head in the Z-axis, especially the height of the pin on the calibration detection head. It automatically adjusts the downward movement of the pin to ensure accurate up-and-down movement and prevents excessive downward movement that could damage the PCB board.

[0018] Figure 1 , 2As shown, the mounting base 14 is a vertically arranged square frame, with a vertically upward-facing functional window 141 at its upper end. Three supporting columns 142 are located within the mounting base 14, on which the vision unit 11, calibration unit 12, and measurement unit 13 are respectively assembled, with all three units exposed through the functional window 141. This modular design facilitates assembly and implementation. Furthermore, each supporting column 142 is equipped with a Z-axis sliding rail 143. The vision unit 11, calibration unit 12, and measurement unit 13 are respectively fixed to the corresponding sliding rail 143 on the supporting column 142. The installation height of the vision unit 11, calibration unit 12, or measurement unit 13 is adjusted by sliding the sliding rail 143 in the Z-axis direction. The sliding rail 143 is a dovetail rail and has a scale 1431 on it, providing structural stability and ease of assembly.

[0019] Figure 3 , 4 As shown, in use, the calibration device of this utility model is integrated into the solder joint inspection equipment and located below the moving area of ​​the inspection head 2 of the solder joint inspection equipment. The fixed base 14 is connected to the base of the solder joint inspection equipment. Then, the installation height of the vision unit 11, calibration unit 12, or measurement unit 13 can be adjusted by the slide rail 143 to obtain a reference for assisting the online calibration of the inspection head 2. The inspection head 2 is equipped with an image capture device 21, a force-controlled actuator with a dial 22, and a laser displacement sensor 23. When the inspection head 2 needs to be calibrated, it can be moved above the calibration device 1 by the multi-degree-of-freedom motion mechanism connected to the inspection head 2. At this time, the vision unit 11 takes a picture to obtain planar images of each inspection component (image capture device 21, dial 22, and laser displacement sensor 23) of the inspection head, and obtains the relative position difference of each inspection component in the X / Y coordinates by combining visual inspection technology, thereby performing calibration. The probe 22 on the detection head is used to move the elastic pointer 122, and the force sensor 121 transmits the signal to the computer to obtain the torque value of the probe. The repeatability and true value of the force control of the probe are then calibrated. The laser displacement sensor 23, in conjunction with the measuring unit 13, measures the position and height of the detection head in the Z direction, especially the height of the probe on the calibration detection head, and automatically adjusts the downward movement of the probe to achieve calibration.

[0020] This invention designs a calibration device for a solder joint inspection equipment, equipped with a vision unit for measuring the relative position difference of each inspection component of the inspection head in the X / Y coordinates, a calibration unit for calibrating the force control repeatability and true value of the pin, and a measurement unit for measuring the relative coordinate position of the laser displacement sensor in the Z direction; achieving machine-based calibration instead of manual calibration, with high speed and efficiency, and meeting online calibration requirements, thus promoting production.

[0021] While the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention should not be limited to the same structure and operation as described above and the accompanying drawings. For those skilled in the art, many equivalent improvements and variations can be made to the above embodiments through logical analysis, reasoning or limited experiments without exceeding the concept and scope of the present invention, but these improvements and variations should all fall within the scope of protection claimed by the present invention.

Claims

1. A calibration device for solder joint inspection equipment, characterized in that, The calibration device (1) is located below the moving area of ​​the inspection head (2) of the solder joint inspection equipment to assist in the online calibration of the inspection head (2); the inspection head is equipped with an image capture device, a force control actuator with a pin and a laser displacement sensor; The calibration device has a fixed base (14) and a vision unit (11) mounted on the fixed base for measuring the relative position difference of each detection component of the detection head in the X / Y coordinate direction, a calibration unit (12) for calibrating the force control repeatability and true value of the needle, and a measurement unit (13) for measuring the relative coordinate position of the laser displacement sensor in the Z direction. The vision unit (11) acquires images and uses existing vision detection principles to analyze and process the images to obtain the relative position difference of each detection component in the X / Y coordinate direction. The calibration unit (12) includes a force sensor (121) and an elastic rod (122) connected to the force sensor. The needle on the detection head moves the elastic rod (122), and the elastic rod (122) outputs a force signal to the force sensor (121), which is then transmitted to the computer for calibration of the force control repeatability and true value of the needle. The measurement unit (13) is a block-shaped standard part with a corresponding height difference structure.

2. The calibration device for the solder joint detection equipment according to claim 1, characterized in that, The mounting base (14) is a square frame that is set vertically, so that the upper end of the mounting base (14) has a vertically upward functional window (141), and three support columns (142) are provided inside the mounting base (14). The vision unit (11), calibration unit (12) and measurement unit (13) are respectively assembled on the three support columns (142), and the vision unit (11), calibration unit (12) and measurement unit (13) are exposed together from the functional window (141).

3. The calibration device for the solder joint detection equipment according to claim 2, characterized in that, Each support column (142) is provided with a slide rail (143) that slides in the Z direction. The vision unit (11), calibration unit (12) and measurement unit (13) are respectively fixed on the slide rail (143) of the corresponding support column (142). The installation height of the vision unit (11), calibration unit (12) or measurement unit (13) is adjusted by sliding the slide rail (143) in the Z direction.

4. The calibration device for the solder joint detection equipment according to claim 3, characterized in that, The slide rail (143) is a dovetail slide rail, and a scale (1431) is provided on the slide rail (143).

Images