A testing device for circuit board processing

Abstract

This invention discloses a testing device for circuit board processing, comprising a circuit board fixture feeding mechanism, a circuit board inspection and transport mechanism, a testing mechanism, and a circuit board testing fixture. The circuit board fixture feeding mechanism includes a conveyor belt and two fixture guides. The circuit board inspection and transport mechanism includes two parallel lead screw tracks and a dual-axis motor. The testing mechanism includes a test mounting box, a tester installed inside the test mounting box, four mounting brackets, and two slide bars. The circuit board testing fixture includes a fixture block, an identification label, and an alignment label. This invention transports the fixture loaded with the circuit board along the guide rail direction to the lead screw track, and then transports it to below the tester via the lead screw track. The alignment label is identified by an alignment device, which can accurately control the error to less than 1mm. Furthermore, error-free alignment can be achieved by lowering the alignment cylinder, which is set for precise alignment. After testing, the fixture can be automatically ejected, and abnormal circuit boards can be marked with inkjet printing for easy subsequent processing.

Description

Technical Field

[0001] This invention relates to the field of circuit board testing technology, and in particular to a testing device for circuit board processing. Background Technology

[0002] With the rapid development of technology, electronic products have also advanced rapidly. Electronic products all contain circuit boards (PCBs), which are manufactured through soldering. During soldering, solder slag can easily connect with electronic components, causing short circuits. Therefore, PCB inspection is necessary. Traditionally, PCB inspection relies mainly on manual visual inspection to determine the quality of metal traces. When using equipment for continuous testing, the transportation of PCBs presents a challenge. Accurately positioning the transport fixture to the testing point and precisely aligning the testing equipment with the PCB pins for automated testing are both difficult. Current conveyor belt systems suffer from fixture placement issues during conveyor belt rotation, making rotation difficult. Typical transport methods lack automatic calibration upon arrival at the testing position to achieve optimal alignment. Therefore, sometimes inaccurate alignment with the PCB pins leads to test failures. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a testing device for circuit board processing, which solves problems such as slow circuit board testing progress and difficulties in continuous testing.

[0004] According to the present invention, a testing device for circuit board processing includes a circuit board fixture feeding mechanism, a circuit board inspection and transportation mechanism, a testing mechanism, and a circuit board testing fixture;

[0005] The circuit board fixture feeding mechanism includes a conveyor belt and two fixture guide tubes. The two fixture guide tubes are provided with downwardly inclined bends near both ends, and the lower half of the bends is cut off. The middle part of the bends is supported by a support rod. The two fixture guide tubes are arranged parallel above the conveyor belt and do not contact the conveyor belt.

[0006] The circuit board inspection and transport mechanism includes two parallel lead screw tracks and a dual-axis motor. The lead screw tracks have rotating shafts at both ends, and bearings are fitted on both rotating shafts. The bearings are fixed by the top of the mounting rod. The top of the mounting rod is semi-circular, and the width of the mounting rod is smaller than the diameter of the lead screw track. The top of the mounting rod is lower than the top of the lead screw track. A driven bevel gear is fitted on the rotating shaft end of the two lead screw tracks on the same side. A driving bevel gear is fitted on the rotating shaft at both ends of the dual-axis motor. The two driving bevel gears mesh with the corresponding driven bevel gears. The bends at the output ends of the two fixture guide tubes are connected to the input ends of the lead screw tracks, and the bends are fitted above the top of the mounting rod.

[0007] The testing mechanism includes a test mounting box, a tester installed inside the test mounting box, four mounting brackets, and two sliding rods. The four mounting brackets are symmetrically arranged in pairs on the outside of two lead screw tracks. Sliding rods are connected between the tops of the mounting brackets on the same side. The tops of the test mounting box near both sides are movably fitted onto the corresponding sliding rods. A mounting groove is provided in the middle of the bottom of the test mounting box. Four limiting rods are provided at the four corners of the mounting groove. The tester is movably fitted onto the four limiting rods at the four corners. A push motor is provided in the middle of the bottom of the mounting groove, and a push screw is connected to the shaft of the push motor. The push screw is helically inserted into the center of the top of the tester. Multiple pin connectors are provided at the bottom of the tester. A label reader is provided on the top of the left side wall of the test mounting box. An aligner is provided in the middle of the bottom of the test mounting box near both sides. A connecting rod is provided between the two mounting brackets on the rear side. A servo motor is provided on the connecting rod. A fine-tuning screw is connected to the shaft of the servo motor. The fine-tuning screw is helically inserted into the side wall of the test mounting box.

[0008] The circuit board testing fixture includes a fixture block, an identification label, and an alignment label. The fixture block has a square slot in the middle, and a hollow square hole in the middle of the square slot. A square adhesive edge is attached to the side wall of the square slot. The fixture block has an identification label on the front and rear upper surfaces of the square slot, and an alignment label on the middle of the left and right sides of the square slot. The fixture block has two parallel long slots on the lower surface. The upper half of the long slot is semi-cylindrical, and the lower half is a square strip. The inner wall of the semi-cylindrical part of the long slot has a thread that matches the lead screw track.

[0009] In some embodiments of the present invention, the diameter of the fixture guide tube is 1 / 3 of the diameter of the lead screw track, and the section of the fixture guide tube above the conveyor belt does not contact the inner wall of the semi-cylindrical portion of the long strip bayonet.

[0010] In other embodiments of the present invention, the output ends of the two lead screw tracks are each connected to an output track, and the latter half of the output track is provided with a sliding track.

[0011] In some other embodiments of the present invention, ventilation bends are provided on the left and right side walls of the test installation box, the output end of the ventilation bends faces downwards towards the tester, and a blower is provided inside the ventilation bends.

[0012] In some other embodiments of the present invention, the fixture block is provided with positioning holes at the four corners near the square slot, and four positioning cylinders are embedded in the bottom of the test mounting box. The cylinder shaft end of the positioning cylinder is conical, and a pressure plate is sleeved on the top of the conical cylinder shaft. After the cylinder shaft of the positioning cylinder is inserted into the positioning hole, the pressure plate presses on the corner of the circuit board.

[0013] In other embodiments of the present invention, the depth of the square slot is / of the circuit board thickness, and the square adhesive edge fan is provided with a positioning post, which corresponds to the positioning slot on the edge of the circuit board.

[0014] In other embodiments of the present invention, the fixture guide tube is provided with fixture detection blocks below the two bends at the output end. When the fixture block slides down from the bend and abuts against the end of the lead screw track, the fixture detection block detects the presence of the fixture block. At this time, the conveyor belt is started to stop transporting. After the circuit board on the previous fixture block has been tested, the dual-axis motor is started to continue running, driving the fixture block in contact with the end of the lead screw track to be transported to the lead screw track for testing. At the same time, the conveyor belt is started to continue transporting the fixture block.

[0015] In other embodiments of the invention, the length of the lead screw track is not less than the sum of the widths of the three fixture blocks.

[0016] In some other embodiments of the present invention, the tester is provided with a spray nozzle, which sprays an abnormal identification code onto the circuit board when the tester detects an abnormality in the circuit board.

[0017] In this invention, the fixture carrying the circuit board is transported along the guide rail to the lead screw guide rail, and then transported to the bottom of the tester via the lead screw guide rail. The alignment label is identified by the alignment device, which can accurately control the error to less than 1mm. Furthermore, the alignment cylinder set by the precision alignment setting can be moved down to achieve error-free alignment, making the pin docking test more accurate. After the test is completed, the fixture can be automatically ejected, and abnormal circuit boards can be marked with inkjet printing for easy subsequent processing. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of a testing device for circuit board processing proposed in this invention.

[0020] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0021] Figure 3 This is a schematic cross-sectional view of the test installation box proposed in this invention.

[0022] Figure 4 This is a schematic cross-sectional view of the test mounting box proposed in this invention at the aligned cylinder position.

[0023] Figure 5 This is a schematic diagram of the circuit board testing fixture proposed in this invention.

[0024] In the diagram: 1. Conveyor belt; 2. Fixture guide tube; 21. Bend; 3. Dual-axis motor; 31. Active bevel gear disc; 4. Lead screw track; 41. Rotating shaft; 411. Bearing; 412. Mounting rod; 42. Driven bevel gear disc; 5. Test mounting box; 50. Vent bend; 501. Blower; 51. Label reader; 52. Aligner; 53. Positioning cylinder; 531. Conical head; 532. Pressing plate; 6. Mounting bracket; 61. Slide rod; 7. Servo motor; 71. Fine-tuning lead screw; 8. Output track; 81. Sliding track; 9. Fixture block; 91. Long strip bayonet; 92. Square slot; 921. Square adhesive edge; 93. Identification label; 94. Alignment label; 95. Hole-cut square hole; 96. Positioning hole; 10. Tester; 101. Push-down motor; 102. Limiting rod; 103. Pin connector. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] like Figure 1-5 As shown, the present invention proposes a testing device for circuit board processing, including a circuit board fixture feeding mechanism, a circuit board inspection and transportation mechanism, a testing mechanism, and a circuit board testing fixture;

[0027] The circuit board fixture feeding mechanism includes a conveyor belt 1 and two fixture guide tubes 2. The two fixture guide tubes 2 are provided with downwardly inclined bends 21 near both ends, and the lower half of the bends 21 is cut off. The middle part of the bends 21 is supported by a support rod. The two fixture guide tubes 2 are arranged parallel above the conveyor belt 1 and do not contact the conveyor belt 1.

[0028] The fixture guide tube 2 is smooth, which makes it easy for the fixture block to slide on it. When it is on the conveyor belt 1, it does not press against the fixture guide tube 2, but is limited by the sliding of the fixture guide tube 2. The downward bending of the bend tube 21 is less than 30°. During the downward movement, the downward movement of the front is pushed by the rear fixture block.

[0029] The circuit board inspection and transport mechanism includes two parallel lead screw tracks 4 and a dual-axis motor 3. The lead screw tracks 4 have rotating shafts 41 at both ends, and bearings 411 are fitted on both ends of the rotating shafts 41. The bearings 411 are fixed by the top of the mounting rod 412. The top of the mounting rod 412 is semi-circular and the width of the mounting rod 412 is smaller than the diameter of the lead screw track 4. The top of the mounting rod 412 is lower than the top of the lead screw track 4. Driven bevel gear disks 42 are fitted on the ends of the rotating shafts 41 on the same side of the two lead screw tracks 4. A driving bevel gear disk 31 is fitted on each of the rotating shafts at both ends of the dual-axis motor 3. The two driving bevel gear disks 31 mesh with the corresponding driven bevel gear disks 42. The bent tubes 21 at the output ends of the two fixture guide tubes 2 are connected to the input ends of the lead screw tracks 4 and the bent tubes 21 are fitted above the top of the mounting rod 412.

[0030] like Figure 2 The bend 21 shown has a gap of about 2mm at the connection point with the lead screw rail 4, and the bottom of the bend 21 is about 1mm higher than the lead screw rail 4. When the fixture block slides down onto the lead screw rail 4, part of the thread on the lead screw rail 4 will engage with the internal thread of the long slot 91 of the fixture block 9. The rotating lead screw rail 4 will slowly pull the fixture block 9 onto the lead screw rail 4, achieving complete thread engagement for subsequent transportation. The threads of the two parallel lead screw rails 4 are opposite, thus achieving synchronous pushing. The thread settings are all designed to enable the two lead screw rails 4 to push the two sides of the fixture block 9 synchronously.

[0031] The testing mechanism includes a test mounting box 5, a tester 10 installed inside the test mounting box 5, four mounting brackets 6, and two sliding rods 61. The four mounting brackets 6 are symmetrically arranged in pairs on the outside of two lead screw tracks 4. Sliding rods 61 are connected between the top ends of the mounting brackets 6 on the same side. The top ends of the test mounting box 5 near both sides are movably fitted onto the corresponding sliding rods 61. A mounting groove is provided in the middle of the bottom of the test mounting box 5. Four limiting rods 102 are provided at the four corners of the mounting groove. The tester 10 is movably fitted onto the four limiting rods 102 at the four corners. The middle of the bottom of the mounting groove is... A push motor 101 is provided, and a push screw is connected to the shaft of the push motor 101. The push screw is helically inserted into the center of the top of the tester 10. The bottom of the tester 10 is provided with multiple pin connectors 103. A label reader 51 is provided on the top of the left side wall of the test mounting box 5. An aligner 52 is provided at the middle of the bottom of the test mounting box 5 near both sides. A connecting rod is provided between the two mounting brackets on the rear side. A servo motor is provided on the connecting rod. A fine adjustment screw 71 is connected to the shaft of the servo motor 7. The fine adjustment screw 71 is helically inserted into the side wall of the test mounting box 5.

[0032] Tester 10 is an existing tester. After docking the pins, it performs the test. The label recognizer 51 (a barcode scanner or other laser recognition device can be used) first recognizes the first identification label 93 on the back. The surface fixture block enters the test point and continues to push slowly. When the second identification label 93 is detected, the surface fixture block 9 is completely under the tester (but still needs to be aligned, but the lead screw track 4 stops rotating). At this time, the servo motor 7 drives the fine adjustment lead screw 71 to rotate slowly and push back and forth so that the aligner 52 is aligned with the aligned label 94. At this time, the downward movement test can be basically performed (the complete alignment method will be set later). The downward-moving tester 10 connects the pin connector 103 to the pin for testing. After the test is completed, the tester is pulled up and the fixture block 9 is transported to perform the next test.

[0033] The circuit board testing fixture includes a fixture block 9, an identification label 93, and an alignment label 94. The fixture block 9 has a square slot 92 in the middle, and a hollow square hole 95 in the middle. A square adhesive edge 921 is attached to the side wall of the square slot 92. The fixture block 9 has an identification label 93 on the front and rear upper surfaces of the square slot 92, and an alignment label 94 on the left and right sides of the square slot 92. The fixture block 9 has two parallel long slots 91 on the lower surface. The upper half of the long slot 91 is semi-cylindrical, and the lower half is square. The inner wall of the semi-cylindrical long slot 91 is threaded to match the lead screw track 4.

[0034] The hollow square hole 95 is designed to facilitate the removal of the circuit board later without having to pry it out. The square rubber edge 921 can press the edge of the circuit board to prevent it from shaking during movement or being difficult to align during testing. If it were a fixed setting, it would be inconvenient to remove it later. The square strip shape provides a certain depth of the locking mechanism, making it less likely to fall off during movement.

[0035] The diameter of the fixture guide tube 2 is 4 / 5 of the diameter of the lead screw track 4. The section of the fixture guide tube 2 above the conveyor belt 1 does not contact the inner wall of the semi-cylindrical portion of the long strip bayonet 91. This facilitates the smooth connection of the long strip bayonet 91 of the fixture block 9 to the lead screw track 4 without affecting the sliding of the fixture block 9 on the fixture guide tube 2.

[0036] Both of the lead screw tracks 4 have corresponding output tracks 8 at their output ends. The latter half of the output track 8 is provided with a sliding track 81. This allows the material to be pushed onto the output track 8, remain there for a period of time, and then be pushed down onto the sliding track 81 by the material behind it to automatically slide down, waiting for the subsequent removal of the circuit board.

[0037] The test mounting box 5 has ventilation bends 50 on its left and right side walls, with the output end of the ventilation bends 50 facing downwards towards the tester 10. A blower 501 is installed inside the ventilation bends 50. During testing, air is blown to dissipate heat and prevent overheating that could damage the circuit board.

[0038] The fixture block 9 has positioning holes 96 at the four corners near the square slot 92. The test mounting box 5 has four positioning cylinders 53 embedded in its bottom. The cylinder shaft of the positioning cylinder 53 is conical at the end. A pressure plate 532 is fitted on the top of the conical cylinder shaft. After the cylinder shaft of the positioning cylinder 53 is inserted into the positioning hole 96, the pressure plate 532 presses on the corner of the circuit board.

[0039] To achieve more precise alignment, the cylinder shaft of the positioning cylinder 53 is inserted into the positioning hole 96 to achieve precise positioning. Then, the pressure plate 532 is used to press it onto the circuit board for easy testing and fixation.

[0040] The depth of the square slot 92 is 2 / 3 of the circuit board thickness. The square adhesive-edged fan is equipped with positioning posts 922, which correspond to the positioning slots on the edge of the circuit board. This prevents the circuit board from being placed in the wrong orientation or misaligned, facilitating error-free testing.

[0041] The fixture guide tube 2 has a fixture detection block below the two bends 21 at the output end. When the fixture block 9 slides down from the bend 21 and abuts against the end of the lead screw track 4, the fixture detection block detects the presence of the fixture block 9. At this time, the conveyor belt 1 is started to stop transporting. After the circuit board on the previous fixture block 9 has been tested, the dual-axis motor 3 is started to continue running, driving the fixture block 9 that is in contact with the end of the lead screw track 4 to be transported to the lead screw track 4 for testing. At the same time, the conveyor belt 1 is started to continue transporting the fixture block 9.

[0042] The fixture detection block is equivalent to a ranging laser. When the fixture block is on it, the fixture block can be detected to be in place, thereby enabling the start and stop of subsequent work.

[0043] The length of the lead screw track 4 is not less than the sum of the widths of the three fixture blocks 9. This allows for the three fixture blocks to be positioned such that one is moved away after testing, one is under inspection, and one can wait for testing.

[0044] The tester 10 is equipped with a spray nozzle. When the tester 10 detects an anomaly on the circuit board, it sprays an anomaly identification code onto the circuit board. This spray-marking of anomalies facilitates subsequent troubleshooting.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A testing device for circuit board processing, characterized in that: This includes a circuit board fixture feeding mechanism, a circuit board testing and transportation mechanism, a testing mechanism, and circuit board testing fixtures; The circuit board fixture feeding mechanism includes a conveyor belt (1) and two fixture guide tubes (2). The two fixture guide tubes (2) are provided with downwardly inclined bends (21) near both ends, and the lower half of the bends (21) is cut off. The bends (21) are supported by a support rod below the middle position. The two fixture guide tubes (2) are arranged parallel above the conveyor belt (1) and do not contact the conveyor belt (1). The circuit board inspection and transport mechanism includes two parallel lead screw tracks (4) and a dual-axis motor (3). Each lead screw track (4) has a rotating shaft (41) at both ends, and bearings (411) are fitted onto both shafts (411). The bearings (411) are fixed by the top of a mounting rod (412). The top of the mounting rod (412) is semi-circular, and its width is smaller than the diameter of the lead screw track (4). The top of the mounting rod (412) is lower than the top of the lead screw track (4). A driven bevel gear disk (42) is fitted on the end of the shaft (41) on the same side of the screw track (4). A driving bevel gear disk (31) is fitted on the shaft at both ends of the dual-shaft motor (3). The two driving bevel gear disks (31) mesh with the corresponding driven bevel gear disks (42). The bent pipes (21) at the output ends of the two fixture guide pipes (2) are connected to the input end of the screw track (4) and the bent pipes (21) are fitted above the top of the mounting rod (412). The testing mechanism includes a test mounting box (5), a tester (10) installed inside the test mounting box (5), four mounting brackets (6) and two sliding rods (61). The four mounting brackets (6) are symmetrically arranged in pairs on the outside of two lead screw tracks (4). Sliding rods (61) are connected between the top ends of the mounting brackets (6) on the same side. The test mounting box (5) is movably fitted onto the corresponding sliding rods (61) at the top positions near both sides. The test mounting box (5) has a mounting groove at the middle position of its bottom. Four limiting rods (102) are provided at the four corner positions of the mounting groove. The tester (10) is movably fitted onto the four limiting rods (102) at the four corner positions. The mounting groove has a mounting groove at the middle position of its bottom. A push motor (101) is provided at the position, and a push screw is connected to the shaft of the push motor (101). The push screw is screwed into the center of the top of the tester (10). The bottom of the tester (10) is provided with multiple pin connectors (103). A label reader (51) is provided on the top of the left side wall of the test mounting box (5). An aligner (52) is provided at the middle of the bottom of the test mounting box (5) near both sides. A connecting rod is provided between the two mounting brackets on the rear side. A servo motor (7) is provided on the connecting rod. A fine adjustment screw (71) is connected to the shaft of the servo motor (7). The fine adjustment screw (71) is screwed into the side wall of the test mounting box (5). The circuit board testing fixture includes a fixture block (9), an identification label (93), and an alignment label (94). The fixture block (9) has a square slot (92) in the middle, and a hollow square hole (95) in the middle. A square adhesive edge (921) is attached to the side wall of the square slot (92). The fixture block (9) has an identification label (93) on the front and rear upper surfaces of the square slot (92). The fixture block (9) has an alignment label (94) in the middle of the left and right sides of the square slot (92). The fixture block (9) has two parallel long slots (91) on the lower surface. The upper half of the long slot (91) is semi-cylindrical and the lower half is square. The semi-cylindrical inner wall of the long slot (91) is threaded to match the lead screw track (4).

2. The testing device for circuit board processing according to claim 1, characterized in that: The diameter of the fixture guide (2) is 4 / 5 of the diameter of the screw track (4), and the section of the fixture guide (2) above the conveyor belt (1) does not contact the inner wall of the semi-cylindrical part of the long strip bayonet (91).

3. The testing device for circuit board processing according to claim 1, characterized in that: Both of the lead screw tracks (4) are connected to output tracks (8) at their output ends, and the latter half of the output tracks (8) is provided with a sliding track (81).

4. The testing device for circuit board processing according to claim 1, characterized in that: The test installation box (5) has ventilation bends (50) on its left and right side walls. The output end of the ventilation bends (50) faces downwards towards the tester (10). A blower (501) is installed inside the ventilation bends (50).

5. The testing device for circuit board processing according to claim 1, characterized in that: The fixture block (9) has positioning holes (96) at the four corners near the square slot (92). The test mounting box (5) has four positioning cylinders (53) embedded in its bottom. The cylinder shaft of the positioning cylinder (53) is conical. A pressure plate (532) is fitted on the top of the conical cylinder shaft. After the cylinder shaft of the positioning cylinder (53) is inserted into the positioning hole (96), the pressure plate (532) presses on the corner of the circuit board.

6. The testing device for circuit board processing according to claim 1, characterized in that: The depth of the square slot (92) is 2 / 3 of the thickness of the circuit board. The square adhesive edge fan is provided with a positioning post (922), which corresponds to the positioning slot on the edge of the circuit board.

7. The testing device for circuit board processing according to claim 1, characterized in that: The fixture guide tube (2) has a fixture detection block below the two bends (21) at the output end. When the fixture block (9) slides down from the bend (21) and touches the end of the lead screw track (4), the fixture detection block detects the presence of the fixture block (9). At this time, the conveyor belt (1) is started to stop the transport. After the circuit board on the previous fixture block (9) is tested, the dual-axis motor (3) is started to continue to run, driving the fixture block (9) that is in contact with the end of the lead screw track (4) to be transported to the lead screw track (4) for testing. At the same time, the conveyor belt (1) is started to continue to transport the fixture block (9).

8. The testing device for circuit board processing according to claim 1, characterized in that: The length of the lead screw track (4) is not less than the sum of the widths of the three jig blocks (9).

9. The testing device for circuit board processing according to claim 1, characterized in that: The tester (10) is equipped with a spray nozzle. When the tester (10) detects an abnormality in the circuit board, it will spray an abnormality identification code onto the circuit board.

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