Flying probe testing device of PCBA (Printed Circuit Board Assembly) and testing method thereof

Abstract

The invention discloses a PCBA flying probe testing device and a testing method thereof.The PCBA flying probe testing device comprises a frame, a conveying mechanism, a plurality of probe parts, a positioning camera, a comparison camera and a tester, the conveying mechanism is installed in the frame, the probe parts are installed at the output end of a driving mechanism, the positioning camera is installed at the output end of the driving mechanism, and the comparison camera is installed at the output end of the driving mechanism; the probe portion is installed on the frame and used for acquiring MARK point coordinates of the PCBA, the comparison camera is installed at the output end of the driving mechanism and used for observing the teaching process and collecting images in the testing process, the tester is installed in the frame, and when the probe portion makes contact with a testing point of the PCBA, the tester can test the function of the testing point. The position of each test point of the PCBA can be accurately positioned through the positioning camera, then the probe part is driven by the driving mechanism to be in contact with each test point in sequence, and each test point of the PCBA is tested under the cooperation of the comparison camera and the tester, so that the test efficiency and the test accuracy of the PCBA can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to a flying probe test device for PCBA and a test method thereof. Background Art

[0002] PCBA (Printed Circuit Board Assembly) refers to the entire process of PCB blank board through SMT mounting or DIP plug-in. With the continuous development of electronic technology, the complexity and integration of PCBA are getting higher and higher. The importance of flying probe tester in electronic equipment manufacturing, automotive electronics, aerospace and other fields is becoming increasingly prominent. It provides key technical support for PCBA quality assurance and helps to ensure the reliability and stability of electronic products.

[0003] At present, most PCBA testing methods use fixed bed-of-nails testing. However, complex and high-density PCBAs may face problems such as poor probe contact and incomplete test coverage. In addition, the cost of making a bed of nails is high and the cycle is long. It is not suitable for small-batch and diversified PCBA production, which will affect the test efficiency and test accuracy of the PCBA. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the technical problems of low test efficiency and low test accuracy of existing PCBA, the present invention provides a flying probe test device and a test method for PCBA, which can improve the test efficiency and test accuracy of PCBA by improving the PCBA test method.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a flying probe test device for PCBA, comprising: a frame, a conveying mechanism, a plurality of probe parts, a positioning camera, a comparison camera and a tester, wherein the conveying mechanism is installed in the frame and is used to carry and convey the PCBA, the probe part is installed at the output end of the driving mechanism and is used to test the PCBA, the positioning camera is installed at the output end of the driving mechanism and is used to obtain the MARK point coordinates of the PCBA, the comparison camera is installed at the output end of the driving mechanism and is used to observe the teaching process and collect images of the testing process, and the tester is installed in the frame, and when the probe part contacts the test point of the PCBA, the tester can test the function of the test point.

[0006] Therefore, when testing the PCBA, the position of each test point of the PCBA can be accurately located by the positioning camera, and then the driving mechanism drives the probe part to contact each test point in turn, and with the cooperation of the comparison camera and the tester, each test point of the PCBA is tested. Compared with the fixed needle bed testing method, this method can quickly and accurately locate the position of each test point of the PCBA, thereby improving the testing efficiency and test accuracy of the PCBA, and reducing the production cost loss caused by unqualified products.

[0007] Furthermore, the probe part includes: a first probe and a second probe, the first probe and the second probe are both connected to the output end of the driving mechanism, and the angle between the first probe and the XOY plane is α, and the angle between the second probe and the XOY plane is β; wherein: α<β. Thus, by designing the first probe and the second probe with different inclination angles, the first probe and the second probe can perform testing operations at the same time without interfering with each other, further improving the testing efficiency of the PCBA.

[0008] Furthermore, when the first probe performs a test, the relationship between the distance K1 between the test point and the obstruction and the maximum height K2 of the obstruction is:

[0009]

[0010] When the second probe performs the test, the relationship between the distance K3 between the test point and the obstruction and the maximum height K4 of the obstruction is:

[0011]

[0012] Thus, it is ensured that the probe can contact the test point of the PCBA, and the shielding object will not hinder the test of the test point.

[0013] Furthermore, the conveying mechanism includes: two conveyor belts and a distance adjustment module, the two conveyor belts jointly carry and transport PCBA, one conveyor belt is connected to the distance adjustment module, the other conveyor belt is connected to the driving end of the distance adjustment module, and the distance adjustment module is connected to the frame. Thus, the distance between the two conveyor belts can be adjusted by the distance adjustment module to meet the requirements of carrying and transporting different types of PCBAs, and then meet the requirements of testing different types of PCBAs, without the need to specially make specific test fixtures for each type of PCBA, thereby reducing production costs and improving efficiency.

[0014] Furthermore, the conveying mechanism also includes: a first driving member and a baffle, the first driving member and the baffle are both located in the detection position area, the first driving member is connected to the conveyor belt, and the baffle is connected to the driving end of the conveyor belt; wherein: the number of the first driving members and the baffle is equal to the number of the conveyor belts.

[0015] Furthermore, the conveying mechanism further includes: a pressing plate, a second driving member and a supporting plate, wherein the pressing plate, the second driving member and the supporting plate are all located in the detection position area, the pressing plate is installed on the top of the conveyor belt, the second driving member is installed on the bottom of the conveyor belt, and the supporting plate is connected to the driving end of the second driving member; wherein: the pressing plate, the second driving member and the supporting plate are equal in number to the conveyor belt. Thus, through the mutual cooperation of the baffle plate, the pressing plate and the supporting plate, the PCBA to be tested can be fixed in the detection position to ensure that the PCBA always remains stable during the test, which can further improve the test efficiency and test accuracy of the PCBA.

[0016] Furthermore, the driving mechanism includes: an X-axis driving module, a first Y-axis driving module and a Z-axis driving module, the X-axis driving module is connected to the frame, the output end of the X-axis driving module is connected to the first Y-axis driving module, the output end of the first Y-axis driving module is connected to the Z-axis driving module; the first probe and the second probe are both connected to the output end of the Z-axis driving module, the positioning camera is connected to the output end of the Z-axis driving module, and the comparison camera is connected to the output end of the Z-axis driving module. Thus, the positions of the first probe, the second probe, the positioning camera and the comparison camera can be controlled to move the first probe, the second probe, the positioning camera and the comparison camera to each test point, thereby realizing the test of the function of each test point of the PCBA.

[0017] Furthermore, it also includes: a plurality of light sources, which are connected to the Z-axis drive module through a mounting bracket; wherein: the number of the light sources is twice the number of the probe parts. Thus, the light sources are installed to match the probe parts (i.e., the first probe and the second probe) to assist the PCBA trial teaching (i.e., for alignment observation during the trial teaching process) and testing operations, so as to improve the clarity of the positioning camera and the comparison camera, and further improve the test efficiency and test effect of the PCBA.

[0018] Furthermore, during the test, the intersection of the axis A of the first probe or the axis B of the second probe and the axis C of the light source is point D, and point D is the test point of the PCBA. Thus, the light emitted by the light source hits the test point, which can improve the clarity of the positioning camera and the comparison camera taking pictures or recording videos, and can clearly observe whether the first probe or the second probe is in contact with the test point of the PCBA.

[0019] A testing method for a flying probe test device of a PCBA comprises the following steps:

[0020] S1. Test teaching of standard PCBA: obtain the coordinates of all test points of standard PCBA relative to MARK through the positioning camera, and then drive the probe part to move through the driving mechanism to test all test points of standard PCBA, and record the coordinates of each test point of standard PCBA relative to MARK point and the test results of each test point;

[0021] S2. Loading and conveying the PCBA to be tested: placing the PCBA to be tested on the conveying mechanism at the loading position, and conveying the PCBA to be tested to the detection position;

[0022] S3, acquiring the MARK point of the PCBA to be tested in step S2 and transporting it to the detection position through the positioning camera;

[0023] S4, recording the coordinate information of each test point of the standard PCAB board and the information of the PCBA MARK point to be tested obtained in step S3 according to step S1, driving the probe part to move by the driving mechanism so that the probe part contacts each test point in turn, and testing each test point of the PCBA to be tested by comparing the camera and the tester to obtain the test result of each test point of the PCBA to be tested;

[0024] S5, comparing the test result of each test point of the PCBA to be tested in step S4 with the test result of each test point of the standard PCBA in step S1 to determine whether the test result of each test point of the PCBA to be tested is qualified;

[0025] S6, conveying the PCBA that has been inspected from the inspection position to the unloading position through the conveying mechanism.

[0026] S6. The PCBA that has been inspected is transported from the inspection position to the unloading position through the conveying mechanism.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] When testing the PCBA, the positioning camera can accurately locate the position of each test point of the PCBA, and then the driving mechanism drives the probe part to contact each test point in turn, and with the cooperation of the comparison camera and the tester, each test point of the PCBA is tested. Compared with the fixed needle bed testing method, this method can quickly and accurately locate the position of each test point of the PCBA, thereby improving the testing efficiency and test accuracy of the PCBA, and reducing the production cost loss caused by unqualified products. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 It is a structural schematic diagram of a flying probe test device for PCBA of the present invention;

[0031] Figure 2 A schematic diagram of the structure of the invented PCBA flying probe test device with part of the frame removed;

[0032] Figure 3 It is a structural schematic diagram of the conveying mechanism of the present invention;

[0033] Figure 4 A top view of the conveying mechanism of the present invention;

[0034] Figure 5 An exploded view of the conveyor belt, baffle, pressure plate and support plate of the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the driving mechanism, positioning camera, comparison camera and light source of the present invention;

[0036] Figure 7 A top view of the driving mechanism, positioning camera, comparison camera and light source of the present invention;

[0037] Figure 8 A diagram showing the position relationship between the first probe, the second probe and the test point of the present invention;

[0038] Fig. 9 is a position relationship diagram of the first probe and the test point of the present invention;

[0039] Fig.10 is a position relationship diagram of the second probe and the test point of the present invention;

[0040] Fig.11 is a partial cross-sectional view of a first probe of the present invention;

[0041] Fig.12 It is a structural schematic diagram of the Z-axis drive module and light source installation of the present invention;

[0042] Fig.13 It is a structural schematic diagram of the mounting bracket of the present invention;

[0043] Fig.14 is a schematic structural diagram of a first connecting member of the present invention;

[0044] Fig.15 The present invention is a flow chart of a test method of a flying probe test device for PCBA.

[0045] In the figure: 1, frame; 2, conveying mechanism; 201, conveyor belt; 202, distance adjustment module; 203, first driving member; 204, baffle; 205, pressure plate; 206, second driving member; 207, supporting plate; 208, support block; 3, probe part; 301, first probe; 3011, first connecting part; 3012, second connecting part; 3013, shielding layer; 3014, probe head; 302, second probe; 4, driving mechanism; 401 , X-axis drive module; 402, first Y-axis drive module; 403, Z-axis drive module; 5, positioning camera; 6, comparison camera; 7, tester; 8, light source; 9, mounting bracket; 901, first connecting piece; 9011, connecting rod; 9012, tightening knob; 9013, connecting ball head; 902, fixing plate; 9021, through hole; 903, fixing piece; 904, second connecting piece; 10, barcode scanner; 11, second Y-axis drive module. DETAILED DESCRIPTION

[0046] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] like Figures 1 to 14 As shown, it is the best embodiment of the present invention. The flying probe test device of PCBA in this embodiment includes: a frame 1, a conveying mechanism 2, a plurality of probe parts 3, a positioning camera 5, a comparison camera 6 and a tester 7. The conveying mechanism 2 is installed in the frame 1 and is used to carry and convey the PCBA. The probe part 3 is installed at the output end of the driving mechanism 4 and is used to test the PCBA. The positioning camera 5 is installed at the output end of the driving mechanism 4 and is used to obtain the MARK point coordinates of the PCBA. The comparison camera 6 is installed at the output end of the driving mechanism 4 and is used to observe the teaching process and collect images during the testing process. The tester 7 is installed in the frame 1. When the probe part 3 contacts the test point of the PCBA, the tester 7 can test the function of the test point. Therefore, when testing the PCBA, the position of each test point of the PCBA can be accurately located by the positioning camera 5, and then the driving mechanism 4 drives the probe part 3 to contact each test point in turn, and with the cooperation of the comparison camera 6 and the tester 7, each test point of the PCBA is tested. Compared with the fixed needle bed testing method, this method can quickly and accurately locate the position of each test point of the PCBA, and test various electrical parameters and connectivity of the test point to determine the fault point of the tested PCBA, which is convenient for subsequent maintenance and improvement, thereby improving the testing efficiency and testing accuracy of the PCBA, reducing the production cost loss caused by unqualified products (that is, being able to discover problems in time, reduce the generation of defective products and subsequent rework), and at the same time, it can better adapt to the testing of new circuit designs and packaging forms of PCBA.

[0050] Specifically, the positioning camera 5 is used to obtain the coordinates of the MARK point of the PCBA, and use the MARK point as the origin to record the position of each test point of the PCBA relative to the MARK point, that is, to obtain the coordinates of each test point, so that the driving mechanism 4 can drive the probe part 3 to move according to these coordinate information and contact each test point in turn.

[0051] Specifically, during the test, the status of the LCD display, LED digital tube and indicator light is captured by the comparison camera 6, and the visual processing system is used to determine whether it is qualified; the tester 7 can test the current, voltage, resistance, load and other measurement parameters of the test point and determine whether it is qualified.

[0052] Specifically, the conveying mechanism 2 is located in the middle of the frame 1, and a probe part 3 and a comparison camera 6 are provided at both ends thereof to test both ends of the PCBA; and since there is only one MARK point of the PCBA, the positioning camera 5 only needs to be set on one side of the PCBA MARK point to obtain the MARK point of the PCBA to realize the positioning of the PCBA.

[0053] Specifically, the tester 7 is isolated by a metal plate to ensure that the conveying mechanism 2 and the driving mechanism 4 will not interfere with the test of the PCBA.

[0054] For example, during testing, the flying probe tester can quickly detect the open circuit or short circuit problem of a tiny solder joint in the PCBA, avoiding the assembly of defective PCBA into the finished product; for some high-density integrated PCBAs, the flying probe tester can flexibly test each pin and circuit to determine whether its performance meets the requirements.

[0055] In this embodiment, the probe part 3 includes: a first probe 301 and a second probe 302, both of which are connected to the output end of the driving mechanism 4, and the angle between the first probe 301 and the XOY plane is α, and the angle between the second probe 302 and the XOY plane is β;

[0056] When the first probe 301 performs a test, the relationship between the distance K1 between the test point and the obstruction and the maximum height K2 of the obstruction is:

[0057]

[0058] When the second probe 302 performs the test, the relationship between the distance K3 between the test point and the obstruction and the maximum height K4 of the obstruction is:

[0059]

[0060] Where: α<β. Thus, by designing the first probe 301 and the second probe 302 with different tilt angles, the first probe 301 and the second probe 302 can perform testing operations at the same time without interfering with each other, further improving the testing efficiency of the PCBA; ensuring that the probes can contact the test points of the PCBA, and that obstructions will not hinder the testing of the test points.

[0061] Specifically, the first probe 301 and the second probe 302 have the same structure; the first probe 301 includes: a first connecting portion 3011, a second connecting portion 3012, a shielding layer 3013 and a probe head 3014, the two ends of the first connecting portion 3011 are respectively connected to the output end of the Z-axis driving module 403 and one end of the second connecting portion 3012, and the connecting portion of the second connecting portion 3012 and the first connecting portion 3011 is provided with a shielding layer 3013 (because the installation method of the first connecting portion 3011 and the second connecting portion 3012 is: one end of the second connecting portion 3012 is inserted into the Z-axis driving module 403, and the shielding layer 3013 is provided at the connecting portion of the second connecting portion 3012 and the first connecting portion 3011). To the first connecting part 3011, therefore, the shielding layer 3013 is located in the first connecting part 3011 and wrapped around the outside of the second connecting part 3012). Since the test signal of the PCBA is weak, the shielding layer 3013 can shield the stronger external signal, so as to avoid high-frequency interference of other signals on the test of the PCBA, which can further improve the test effect and test efficiency of the PCBA. The probe head 3014 is installed at the other end of the second connecting part 3012 in a plug-in manner. When the probe head 3014 is damaged, it can be replaced in time, and only the probe head 3014 needs to be replaced.

[0062] Specifically, the first connecting part 3011 is made of POM (polyformaldehyde) material, which is suitable for making wear-reducing and wear-resistant parts, transmission parts, chemical and instrument parts. Its rigidity and high wear resistance are mainly suitable for products that act as a skeleton, such as gears, bearings, automotive parts, machine tools, and instrument internals.

[0063] Specifically, the rated current of the first probe 301 and the second probe 302 is 5A-8A, the contact resistance is <50mΩ, the working stroke is 7.8mm, the test range is: 500*500, the X-axis drive module 401 motor is ±0.005mm, the first Y-axis drive module 402 and the Z-axis drive module 403 are ±0.02mm.

[0064] In this embodiment, α=77.5°, β=85.9°, so that the first probe 301 and the second probe 302 can be ensured to be within a square region with a length of 1.27 mm.

[0065] Specifically, although there are multiple first probes 301 and second probes 302, the number of first probes 301 and second probes 302 cannot cover the test requirements of all test points. Therefore, each first probe 301 and each second probe 302 need to have a signal multiplexing function, and with the cooperation of the driving mechanism 4, the signals and test positions of the first probe 301 and the second probe 302 can be flexibly changed; the signal multiplexing function is realized by a channel signal switching board, and the channel switching board executes the channel input command sent by the host computer to execute channel switching. The specific command of the host computer is edited in the PCBA test process configuration and sent to the channel switching board during the execution of the PCBA test process; each channel corresponds to a signal point.

[0066] In this embodiment, the conveying mechanism 2 includes: two conveyor belts 201, a distance adjustment module 202, a first driving member 203, a baffle 204, a pressure plate 205, a second driving member 206 and a supporting plate 207. The two conveyor belts 201 jointly carry and transport the PCBA. One conveyor belt 201 is connected to the distance adjustment module 202, and the other conveyor belt 201 is connected to the driving end of the distance adjustment module 202. The distance adjustment module 202 is connected to the frame 1. The first driving member 203, the baffle 204, the pressure plate 205, the second driving member 206 and the supporting plate 207 are connected to the frame 1. 206 and the supporting plate 207 are both located in the detection position area, the first driving member 203 is connected to the conveyor belt 201, the baffle 204 is connected to the driving end of the conveyor belt 201, the pressure plate 205 is installed on the top of the conveyor belt 201, the second driving member 206 is installed at the bottom of the conveyor belt 201, and the supporting plate 207 is connected to the driving end of the second driving member 206; wherein: the number of the first driving member 203, the baffle 204, the pressure plate 205, the second driving member 206 and the supporting plate 207 are equal to the number of the conveyor belt 201. Therefore, the distance between the two conveyor belts 201 can be adjusted by the distance adjustment module 202 to meet the requirements of carrying and transporting PCBAs of different models, and then meet the requirements of testing PCBAs of different models. There is no need to specially make a specific test fixture for each type of PCBA, thereby reducing production costs and improving efficiency. Through the mutual cooperation of the baffle 204, the pressure plate 205 and the supporting plate 207, the PCBA to be tested can be fixed in the detection position to ensure that the PCBA always remains stable during the test, which can further improve the test efficiency and test accuracy of the PCBA.

[0067] Specifically, during transportation, the PCBA is clamped by two conveyor belts 201 to achieve transportation of the PCBA; during testing, the baffle 204 is driven downward by the first driving member 203 to fix the PCBA from the side of the PCBA (i.e., to prevent the PCBA from continuing to move forward), and the supporting plate 207 is driven upward by the second driving member 206, and with the cooperation of the pressing plate 205, the PCBA is clamped and fixed from the upper and lower directions; after the test is completed, the baffle 204 is driven upward by the first driving member 203, and the baffle 204 no longer constrains the PCBA, and the supporting plate 207 is driven downward by the second driving member 206, and the supporting plate 207 and the pressing plate 205 no longer constrain the PCBA, and the conveyor belt 201 can continue to drive the PCBA to move to reach the unloading position.

[0068] Specifically, the second driving member 206 is installed on the conveyor belt 201 through a supporting block 208 .

[0069] Specifically, the conveying mechanism 2 supports three-stage speed transmission, supports automatic positioning and locking of PCBA, supports front-end loader interface and rear-end unloader interface, adopts stepper drive, has a maximum speed of 200mm / s, flatness of 0.1mm / 500mm, parallelism with the XOY surface of 0.1mm / 500mm, and edge clamping reserve of ≥2mm.

[0070] For example, the models of the two distance adjustment modules 202 are LS100-1610-550-R-0-P20 and LS100-1610-550-L-0-P20 respectively. The horizontal load can reach 25kg, the vertical load can reach 10kg, the screw lead is 10mm, the rated speed is 500mm / s, the repeatability is ±0.02mm, the stroke is 500mm, and the power is 200w; the first driving component 203 adopts a cylinder, and the second driving component 206 adopts a cylinder.

[0071] In this embodiment, the driving mechanism 4 includes: an X-axis driving module 401, a first Y-axis driving module 402 and a Z-axis driving module 403, the X-axis driving module 401 is connected to the frame 1, the output end of the X-axis driving module 401 is connected to the first Y-axis driving module 402, and the output end of the first Y-axis driving module 402 is connected to the Z-axis driving module 403; the first probe 301 and the second probe 302 are both connected to the output end of the Z-axis driving module 403, the positioning camera 5 is connected to the output end of the Z-axis driving module 403, and the comparison camera 6 is connected to the output end of the Z-axis driving module 403. Thus, the positions of the first probe 301, the second probe 302, the positioning camera 5 and the comparison camera can be controlled to move the first probe 301, the second probe 302, the positioning camera 5 and the comparison camera to each test point, thereby realizing the test of the function of each test point of the PCBA.

[0072] Specifically, the motor of the X-axis drive module 401, the motor of the first Y-axis drive module 402, and the motor of the Z-axis drive module 403 all use the EtherCAT bus, and use the CODESYS programming system integrated with the IEC6131-3 standard and the Softmotion toolkit of the CODESYS real-time motion system to realize multi-axis servo motion control; the movement direction and movement speed of the motor of the X-axis drive module 401, the motor of the first Y-axis drive module 402, and the motor of the Z-axis drive module 403 are unified by the upper computer Control, the host computer realizes data exchange with the operation controller through Ethernet and issues control commands. The motion controller realizes data exchange with multiple servo controllers through the EtherCAT protocol and issues control commands. The servo driver drives the motor of the X-axis drive module 401, the motor of the first Y-axis drive module 402 and the motor of the Z-axis drive module 403 in a one-to-one correspondence, and controls the motor of the X-axis drive module 401, the motor of the first Y-axis drive module 402 and the motor of the Z-axis drive module 403 according to the issued commands.

[0073] For example, the model of the X-axis drive module 401 motor is TC-SLM160-D04-T7509A-1000L-TL05-GP15, with a continuous thrust of 316N, a stroke of 1000mm, a speed of 1000mm / s, and a load of 30kg; the model of the first Y-axis drive module 402 motor is TC-SLM120-D01-T4809A-600L-TL05-GP03, with a continuous thrust of 176N, a stroke of 600mm, a speed of 1000mm / s, and a load of 16kg; the Z-axis drive module 403 motor adopts a three-phase permanent magnet synchronous coreless DC motor, whose model is LMU22-76-06B, with a continuous thrust of 58N, a stroke of 65mm, a load of 1kg, and a continuous current of 2.9A.

[0074] In this embodiment, it also includes: a plurality of light sources 8, which are connected to the Z-axis driving module 403 through a mounting bracket 9; during testing, the intersection of the axis A of the first probe 301 or the axis B of the second probe 302 and the axis C of the light source 8 is point D, and point D is the test point of the PCBC board; wherein: the number of light sources 8 is twice the number of probe parts 3. Thus, the light source 8 is installed for the probe part 3 (i.e., the first probe 301 and the second probe 302) to assist the trial teaching (i.e., for alignment observation during the trial teaching process) and test operation of the PCBA, so as to improve the clarity of the positioning camera 5 and the comparison camera 6 (i.e., it can avoid the positioning camera 5 and the comparison camera 6 from operating in dim light), and further improve the test efficiency and test effect of the PCBA; so that the light emitted by the light source 8 hits the test point, on the one hand, it can improve the clarity of the positioning camera 5 and the comparison camera 6 taking pictures or recording videos, and on the other hand, it can clearly observe whether the first probe 301 or the second probe 302 is in contact with the test point of the PCBA.

[0075] Specifically, the mounting bracket 9 includes: two first connecting members 901, two fixing plates 902, two fixing members 903 and a second connecting member 904, one end of one first connecting member 901 is connected to the Z-axis driving module 403, the second connecting member 904 is sleeved on the outside of the light source 8, one end of another first connecting member 901 is connected to the second connecting member 904, the other ends of the two first connecting members 901 are located between the two fixing plates 902, and the fixing member 903 is connected to the fixing plate 902; the first connecting member 901 includes: a connecting rod 9011, a tightening knob 9012 and a connecting ball head 9013, the tightening knob 9014 is 012. The connecting ball heads 9013 are respectively installed at the two ends of the connecting rod 9011, and one end of the two first connecting members 901 connecting rods 9011 are respectively inserted into the Z-axis drive module 403 and the second connecting member 904, and are fixed by tightening the knob 9012. The fixing plate 902 is provided with a through hole 9021, and the connecting ball heads 9013 are abutted against the fixing plate 902 through the through hole 9021. When in use, the Z-axis drive module 403 and the light source 8 can be adjusted to any angle through the two connecting ball heads 9013, and when adjusting, it is only necessary to rotate and loosen the fixing member 903, which has a simple structure, is convenient to adjust, and has a wide adjustment range.

[0076] like Fig.15 As shown, a test method of a flying probe test device for a PCBA comprises the following steps:

[0077] S1. Test teaching of standard PCBA: obtain the coordinates of all test points of standard PCBA relative to MARK through positioning camera 5, and then drive probe part 3 to move through driving mechanism 4 to test all test points of standard PCBA, and record the coordinates of each test point of standard PCBA relative to MARK point and the test result of each test point;

[0078] S2, loading and conveying of the PCBA to be tested: placing the PCBA to be tested on the conveying mechanism 2 at the loading position, and conveying the PCBA to be tested to the detection position;

[0079] S3, obtaining the MARK point of the PCBA to be tested in step S2 and transported to the inspection position through the positioning camera 5;

[0080] S4, according to step S1, the coordinate information of each test point of the standard PCAB board and the information of the PCBA MARK point to be tested obtained in step S3 are recorded, and the probe part 3 is driven to move by the driving mechanism 4 so that the probe part 3 contacts each test point in turn, and each test point of the PCBA to be tested is tested by the comparison camera 6 and the tester 7 to obtain the test result of each test point of the PCBA to be tested;

[0081] S5, comparing the test result of each test point of the PCBA to be tested in step S4 with the test result of each test point of the standard PCBA in step S1 to determine whether the test result of each test point of the PCBA to be tested is qualified;

[0082] S6, conveying the PCBA that has been inspected from the inspection position to the unloading position through the conveying mechanism 2.

[0083] Specifically, in step S1, at the loading position, the identification code of the PCBA is scanned by the barcode scanner 10, and the model, code and other information of the PCBA are recorded. At the detection position, the trial teaching operation of the PCBA standard parts is completed by the probe part 3, the driving mechanism 4, the positioning camera 5, the comparison camera 6 and the tester 7, and the position of each test point of the PCBA standard parts and the test result of each test point are recorded. The trial teaching operation of different types of PCBA standard parts can be completed at one time, which is convenient for the subsequent PBCA test operation (that is, the first test is completed by the positioning camera 5). The first probe 301, the second probe 302 and the test point are accurately positioned, and the input and output signals of the tester 7 are configured, for example: input voltage, working current, output ripple and other parameters); in step S2, the identification code of the PCBA to be tested is identified by the barcode scanner 10. If the PCBA to be tested has completed the trial teaching (that is, the relevant information has been stored through the trial teaching operation), the subsequent test operation is executed. If the PCBA to be tested has not completed the trial teaching (that is, the corresponding standard parts cannot be found, and the subsequent test operation cannot be carried out), an error is reported.

[0084] Specifically, the barcode scanner 10 is installed at the driving end of the second Y-axis driving module 11, and the second Y-axis driving module 11 is installed on the frame 1, so that the barcode scanner 10 can move along the Y-axis to ensure that the identification code of the PCBA can be scanned and identified (the identification code positions of different PCBAs are different).

[0085] It should be noted that: 1. PCBA testing refers to the testing of the functional module circuit under power-on state, completing the data collection, numerical analysis, result determination, data uploading, etc. of each parameter;

[0086] 2. The host computer has built-in RS232, RS485, CAN and Ethernet interfaces. Through the communication protocol content preset in the host computer, data is exchanged with the PCBA to be tested to verify the communication function;

[0087] 3. The tester 7 has a built-in measuring instrument. By moving the flying probe to contact the measuring position, the current, voltage, resistance, load and other measuring parameters in the tester 7 are read and the qualification is determined;

[0088] 4. The display status of PCBA substrate LED, LCD display, DIP switch and other components is visually tested by comparing the camera.

[0089] To sum up, when testing the PCBA, the present invention can accurately locate the position of each test point of the PCBA through the positioning camera 5, and then drive the probe part 3 to contact each test point in turn through the driving mechanism 4, and test each test point of the PCBA with the cooperation of the comparison camera 6 and the tester 7. Compared with the fixed needle bed testing method, this method can quickly and accurately locate the position of each test point of the PCBA, thereby improving the testing efficiency and testing accuracy of the PCBA, and reducing the production cost loss caused by unqualified products.

[0090] The above description is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A flying probe test device for PCBA, characterized in that: include: Framework (1), and A conveying mechanism (2), the conveying mechanism (2) is installed in the frame (1) and is used to carry and convey the PCBA; A plurality of probe parts (3), wherein the probe parts (3) are installed at the output end of the driving mechanism (4) and are used to test the PCBA; A positioning camera (5), the positioning camera (5) is installed at the output end of the driving mechanism (4) and is used to obtain the MARK point coordinates of the PCBA; A comparison camera (6), which is installed at the output end of the driving mechanism (4) and is used for observing the teaching process and collecting images during the testing process; A tester (7), the tester (7) being installed in the frame (1), and when the probe part (3) contacts a test point of the PCBA, the tester (7) can test the function of the test point.

2. The flying probe test device for PCBA according to claim 1, characterized in that: The probe part (3) comprises: A first probe (301) and a second probe (302), wherein the first probe (301) and the second probe (302) are both connected to the output end of the driving mechanism (4), and the angle between the first probe (301) and the XOY plane is α, and the angle between the second probe (302) and the XOY plane is β; Among them: α<β.

3. The flying probe test device for PCBA according to claim 2, characterized in that: When the first probe (301) performs a test, the relationship between the distance K1 between the test point and the obstruction and the maximum height K2 of the obstruction is: When the second probe (302) performs a test, the relationship between the distance K3 between the test point and the obstruction and the maximum height K4 of the obstruction is:

4. The flying probe test device for PCBA according to claim 1, characterized in that: The conveying mechanism (2) comprises: Two conveyor belts (201) and a distance adjustment module (202), the two conveyor belts (201) jointly carry and convey PCBA, one conveyor belt (201) is connected to the distance adjustment module (202), the other conveyor belt (201) is connected to the driving end of the distance adjustment module (202), and the distance adjustment module (202) is connected to the frame (1).

5. The flying probe test device for PCBA according to claim 4, characterized in that: The conveying mechanism (2) further comprises: A first driving member (203) and a baffle (204), wherein the first driving member (203) and the baffle (204) are both located in a detection area, the first driving member (203) is connected to the conveyor belt (201), and the baffle (204) is connected to a driving end of the conveyor belt (201); Wherein: the number of the first driving members (203) and the baffles (204) is equal to the number of the conveyor belts (201).

6. The flying probe test device for PCBA according to claim 4, characterized in that: The conveying mechanism (2) further comprises: A pressing plate (205), a second driving member (206) and a supporting plate (207), wherein the pressing plate (205), the second driving member (206) and the supporting plate (207) are all located in a detection area, the pressing plate (205) is installed on the top of the conveyor belt (201), the second driving member (206) is installed on the bottom of the conveyor belt (201), and the supporting plate (207) is connected to the driving end of the second driving member (206); Wherein: the number of the pressing plate (205), the second driving member (206) and the supporting plate (207) is equal to the number of the conveyor belt (201).

7. The flying probe test device for PCBA according to claim 2, characterized in that: The driving mechanism (4) comprises: An X-axis driving module (401), a first Y-axis driving module (402) and a Z-axis driving module (403), wherein the X-axis driving module (401) is connected to the frame (1), an output end of the X-axis driving module (401) is connected to the first Y-axis driving module (402), and an output end of the first Y-axis driving module (402) is connected to the Z-axis driving module (403); The first probe (301) and the second probe (302) are both connected to the output end of the Z-axis driving module (403), the positioning camera (5) is connected to the output end of the Z-axis driving module (403), and the comparison camera (6) is connected to the output end of the Z-axis driving module (403).

8. The flying probe test device for PCBA according to claim 7, characterized in that: Also includes: A plurality of light sources (8), wherein the light sources (8) are connected to the Z-axis driving module (403) via a mounting bracket (9); Wherein: the number of the light sources (8) is twice the number of the probe parts (3).

9. The flying probe test device for PCBA according to claim 8, characterized in that: During testing, the intersection of the axis A of the first probe (301) or the axis B of the second probe (302) and the axis C of the light source (8) is point D, and point D is the test point of the PCBC board.

10. A testing method for a flying probe test device of a PCBA according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Test teaching of standard PCBA: obtaining the coordinates of all test points of standard PCBA relative to MARK through the positioning camera (5), and then driving the probe part (3) to move through the driving mechanism (4) to test all test points of standard PCBA, and recording the coordinates of each test point of standard PCBA relative to MARK point and the test result of each test point; S2, loading and conveying the PCBA to be tested: placing the PCBA to be tested on the conveying mechanism (2) at the loading position, and conveying the PCBA to be tested to the detection position; S3, acquiring the MARK point of the PCBA to be tested transported to the inspection position in step S2 through the positioning camera (5); S4, recording the coordinate information of each test point of the standard PCBA board and the information of the PCBA MARK point to be tested obtained in step S3 according to step S1, driving the probe part (3) to move by the driving mechanism (4), so that the probe part (3) contacts each test point in turn, and testing each test point of the PCBA to be tested by using a comparison camera (6) and a tester (7), so as to obtain a test result of each test point of the PCBA to be tested; S5, comparing the test result of each test point of the PCBA to be tested in step S4 with the test result of each test point of the standard PCBA in step S1 to determine whether the test result of each test point of the PCBA to be tested is qualified; S6. The PCBA that has been inspected is transported from the inspection position to the unloading position by the transport mechanism (2).

Images