High-efficiency double-sided hole position measurement device and method for circuit board

Abstract

A high-efficiency double-sided hole position measurement device and method for a circuit board (1). A transfer mechanism (6) configured to position and turn-over the circuit board (1) is provided on a cross beam of a gantry (5); and the transfer mechanism (6) comprises a linear cylinder (7) fixedly arranged on a bottom surface of the cross beam, an upright plate fixedly arranged on an acting end of a piston rod of the linear cylinder (7), and a vertical cylinder (8) fixedly arranged on an end face of the upright plate. A pressing cylinder (13) is fixedly provided on a top surface of a positioning seat (11), a piston rod of the pressing cylinder (13) extends into a through slot, and a pressing block (14) is fixedly provided at an extension end. A measurement mechanism (15) for measuring hole positions in the circuit board (1) is provided on a workbench (4), a displacement sensor (20) is mounted on a bottom surface of each movable plate (19), a vertically-arranged spring (21) is sleeved on each guide column (18), a top end of each spring (21) is fixedly arranged on a bottom surface of a horizontal plate, and the two displacement sensors (20) are both connected to a signal receiver (22) via signal lines. The measurement device and method have the beneficial effects of reducing the working intensity of workers, and greatly improving the measurement efficiency of the hole positions in the circuit board (1).

Description

A device and method for efficiently detecting double-sided holes in a circuit board

[0001] This application claims priority to a Chinese patent application filed with the Patent Office of China on January 22, 2024, with application number 202410085757.9 and invention name “A device and method for efficiently detecting double-sided holes in a circuit board”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present invention relates to the technical field of detecting hole positions on a circuit board, and in particular to a device and method for efficiently detecting double-sided hole positions on a circuit board. Background Art

[0003] A circuit board (see Figures 1 and 2) is installed in an electronic control chassis. This circuit board primarily controls the proper operation of the various electrical components within the chassis. Two through-holes A2 are defined on the bottom surface of the circuit board 1, and two through-holes B3 are defined on the top surface. The horizontal spacing between the two through-holes B3 is greater than the horizontal spacing between the two through-holes A2. Both through-holes A2 are located between the two through-holes B3, and the diameters of through-holes A2 and B3 are equal. Through-holes A2 and B3 are used for soldering different types of electronic components.

[0004] After a batch of circuit boards 1 are produced, the process requires that the horizontal spacing between two through holes A2 on each circuit board 1 be inspected, and the horizontal spacing between two through holes B3 also be inspected. If the horizontal spacing between the two through holes A2 does not meet the requirements, or the horizontal spacing between the two through holes B3 does not meet the design requirements, the worker will determine that the inspected circuit board 1 is unqualified; if it is detected that both horizontal spacings meet the design requirements, the worker will determine that the inspected circuit board 1 is qualified.

[0005] The method for inspecting the hole positions on circuit boards in the workshop is as follows: a worker first takes out a circuit board 1 to be inspected from a material basket, then places the two through holes A2 of the circuit board 1 upwards, and then uses a vernier caliper to measure the horizontal distance between the two through holes A2. If the measured horizontal distance between the two through holes A2 does not meet the design requirements, the circuit board 1 is judged to be unqualified and the worker removes the unqualified product; if the measured horizontal distance between the two through holes A2 meets the design requirements, the circuit board 1 is judged to be semi-qualified.

[0006] The worker then turns the semi-qualified product over so that the two through holes B3 of the semi-qualified product face upward. The worker then uses a vernier caliper to measure the horizontal distance between the two through holes B3. If the measured horizontal distance between the two through holes B3 of the semi-qualified product does not meet the design requirements, the semi-qualified product is determined to be unqualified and the worker removes the unqualified product. If the measured horizontal distance between the two through holes B3 meets the design requirements, the semi-qualified product is determined to be qualified and the worker places the qualified product into the finished product basket.

[0007] The worker repeats the above operation to continuously inspect the hole positions on multiple circuit boards 1 .

[0008] However, although the method in the workshop can detect the hole positions on the circuit board 1, in actual operation, there are still the following technical defects:

[0009] I. It is necessary to manually use a vernier caliper to detect the horizontal spacing between the two through holes A2, and it is also necessary to manually use a vernier caliper to detect the horizontal spacing between the two through holes B3, and it is also necessary to manually read the value on the vernier caliper, which undoubtedly increases the detection time of the hole position of the single circuit board 1, thereby reducing the detection efficiency of the hole position of the circuit board 1.

[0010] II. After detecting a substandard product, the substandard product needs to be manually turned over, which not only increases the workload of the worker, but also increases the time required to inspect the holes of a single circuit board 1, further reducing the inspection efficiency of the holes of the circuit board 1. Therefore, there is an urgent need for an inspection device and method that reduces the workload of workers and greatly improves the efficiency of hole inspection on circuit boards. Summary of the Invention

[0011] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a circuit board double-sided hole position efficient detection device and method that reduces the workload of workers and greatly improves the efficiency of hole position detection on the circuit board.

[0012] The object of the present invention is achieved through the following technical solutions: a high-efficiency detection device for double-sided hole position of a circuit board, which includes a gantry fixedly mounted on the workbench surface, the crossbeam of the gantry being provided with a transfer mechanism for positioning and flipping the circuit board, the transfer mechanism including a linear cylinder fixedly mounted on the bottom surface of the crossbeam, a vertical plate fixedly mounted on the action end of the piston rod of the linear cylinder, and a vertical cylinder fixedly mounted on the end surface of the vertical plate, the piston rod of the vertical cylinder extending downwardly below the vertical plate, and a connecting plate fixedly mounted on the extended end, a stepping motor fixedly mounted on the left end surface of the connecting plate, the output shaft of the stepping motor passing through the connecting plate, and a positioning seat fixedly mounted on the extended end, a positioning groove being provided on the right end surface of the positioning seat, the positioning groove being matched with the outer contour of the left end portion of the circuit board, a through groove being provided on the top surface of the positioning seat connecting the positioning groove, a pressing cylinder being fixedly mounted on the top surface of the positioning seat, the piston rod of the pressing cylinder extending in the through groove, and a pressing block fixedly mounted on the extended end;

[0013] The workbench is provided with a detection mechanism for detecting the hole position on the circuit board, the detection mechanism includes a double-acting cylinder fixed on the workbench surface, L-plates are provided on the working ends of the two piston rods of the double-acting cylinder, the vertical plate of the L-plate is fixed on the working end of the piston rod of the double-acting cylinder, a guide column is slidably installed in the horizontal plate of the L-plate, the outer diameter of the guide column is equal to the diameter of the through hole A, the upper end of the guide column extends above the horizontal plate of the L-plate, the lower end of the guide column is fixed with a movable plate, a displacement sensor is installed on the bottom surface of the movable plate, a vertically arranged spring is sleeved on the guide column, the top end of the spring is fixed on the bottom surface of the horizontal plate, and the bottom end of the spring is fixed on the top surface of the movable plate, and the two displacement sensors are connected to the signal receiver via signal lines.

[0014] A plurality of supporting legs supported on the ground are fixedly provided on the bottom surface of the workbench.

[0015] A bracket is fixed on the top surface of the positioning seat, the cylinder barrel of the pressing cylinder is fixed on the top of the bracket, and the piston rod of the pressing cylinder passes through the bracket.

[0016] The pressing block is in sliding cooperation with the through slot.

[0017] A guide seat is fixedly provided on the top surface of the L-plate horizontal plate, and the guide rod is slidably installed in the guide seat.

[0018] The two L plates are symmetrically arranged with respect to the double-acting cylinder, and the two guide columns are symmetrically arranged with respect to the double-acting cylinder.

[0019] The detection device also includes a controller, which is electrically connected to the linear cylinder, the vertical cylinder, the pressing cylinder, the double-acting cylinder and the stepping motor via signal lines.

[0020] A method for efficiently detecting double-sided holes on a circuit board comprises the following steps:

[0021] S1. A worker takes out a circuit board to be inspected and inserts the left end of the circuit board into the positioning groove of the positioning seat from right to left. Since the positioning groove matches the outer contour of the left end of the circuit board, the circuit board is positioned. At this time, the two through holes A on the bottom surface of the circuit board are respectively located above the two guide posts.

[0022] S2. The worker controls the piston rod of the pressing cylinder to extend downward, which drives the pressing block to move downward. The pressing block passes through the through slot and presses on the circuit board, thereby fixing the circuit board tooling in the positioning seat;

[0023] S3. Detecting the horizontal spacing between two through holes A on the circuit board: Control the piston rod of the vertical cylinder to extend downward, which drives the connecting plate downward. The connecting plate drives the stepper motor downward, which drives the positioning seat downward. The positioning seat drives the circuit board to move downward synchronously, and the two through holes A on the circuit board move toward the two guide posts respectively.

[0024] When the piston rod of the vertical cylinder is fully extended, if the signal receiver receives a displacement signal from the displacement sensor, it means that the circuit board has pressed the guide column downward, and the guide column has driven the movable plate to move downward for a distance. The movable plate has driven the displacement sensor to move downward, and the displacement sensor has sent a displacement signal to the signal receiver. At this time, the worker determines that the horizontal spacing between the two through holes A of the circuit board does not meet the design requirements and determines that the circuit board is unqualified. The worker controls the piston rod of the pressing cylinder to retract upward to separate the pressing block from the circuit board. The worker removes the unqualified product from the positioning slot and discards it after removal.

[0025] If the signal receiver does not receive the displacement signal from the displacement sensor, it means that the circuit board has not been pressed down to the guide posts, that is, the upper ends of the two guide posts are respectively embedded in the two through holes A. At this time, the worker determines that the horizontal spacing between the two through holes A of the circuit board meets the design requirements and judges the circuit board as a semi-qualified product, thus completing the detection of the horizontal spacing between the two through holes A.

[0026] S4. Detection of the horizontal spacing between two through holes B on semi-qualified products. The specific operation steps are as follows:

[0027] S41. Control the piston rod of the vertical cylinder to retract upward, the piston rod drives the connecting plate to move upward, the connecting plate drives the stepping motor to move upward, the stepping motor drives the positioning seat to move upward, and the positioning seat drives the semi-qualified product to move upward synchronously;

[0028] S42. The worker controls the stepper motor to start. The output shaft of the stepper motor drives the positioning seat to rotate. The positioning seat drives the semi-qualified product to rotate synchronously. When the semi-qualified product is turned 180 degrees, the controller controls the stepper motor to stop. At this time, both through holes B on the semi-qualified product face downward.

[0029] S43. The two piston rods of the double-acting cylinder of the control detection mechanism are extended simultaneously. The piston rods drive the L-plate to move away from the double-acting cylinder. The L-plate drives the guide posts to move synchronously. The two guide posts move in opposite directions. When the two piston rods of the double-acting cylinder are fully extended, the two guide posts are respectively located below the two through holes B of the semi-qualified product.

[0030] S44. Control the piston rod of the vertical cylinder to extend downward, and the piston rod drives the connecting plate to move downward. The connecting plate drives the stepper motor, the positioning seat and the semi-qualified product to move downward synchronously. When the piston rod of the vertical cylinder is fully extended, if the signal receiver receives a displacement signal from the displacement sensor, it means that the semi-qualified product has pressed the guide column downward, and the guide column drives the movable plate to move downward for a distance. The movable plate drives the displacement sensor to move downward, and the displacement sensor sends a displacement signal to the signal receiver. At this time, the worker determines that the horizontal spacing between the two through holes B of the semi-qualified product does not meet the design requirements and determines that the semi-qualified product is unqualified. The worker controls the piston rod of the pressing cylinder to retract downward to separate the pressing block from the semi-qualified product. The worker removes the unqualified product from the positioning slot and discards it after removal.

[0031] If the signal receiver does not receive the displacement signal from the displacement sensor, it means that the semi-qualified product has not been pressed down to the guide post, that is, the upper ends of the two guide posts are respectively embedded in the two through holes B. At this time, the worker determines that the horizontal spacing between the two through holes B of the semi-qualified product meets the design requirements and judges the semi-qualified product as a qualified product, thereby realizing the detection of the horizontal spacing between the two through holes B, and finally achieving the hole position detection of a circuit board;

[0032] S5. Removal of qualified products: The piston rod of the pressing cylinder is controlled to retract downward to separate the pressing block from the semi-qualified products. After separation, the piston rod of the vertical cylinder is controlled to retract upward, which drives the connecting plate upward, and the connecting plate drives the qualified products upward. Then, the piston rod of the linear cylinder is controlled to retract rightward, which drives the vertical plate rightward, and in turn drives the vertical cylinder rightward, which drives the positioning seat and the qualified products rightward. When the piston rod of the linear cylinder is fully retracted, the worker stands on the right side of the workbench and removes the qualified products from the positioning slot. After removal, the qualified products are placed in the finished product basket.

[0033] S6. The worker repeats the operations of steps S1 to S5 to continuously detect the hole positions of multiple circuit boards.

[0034] The present invention has the following advantages: reducing the workload of workers and greatly improving the efficiency of hole position detection on circuit boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the structure of a circuit board;

[0036] FIG2 is a top view of FIG1 ;

[0037] FIG3 is a schematic structural diagram of the present invention;

[0038] FIG4 is a main cross-sectional schematic diagram of FIG3 ;

[0039] Figure 5 is a schematic structural diagram of the transfer mechanism;

[0040] Figure 6 is a schematic structural diagram of a positioning seat;

[0041] FIG7 is a right side view of FIG6;

[0042] FIG8 is a schematic structural diagram of a detection mechanism;

[0043] FIG9 is a schematic diagram of inserting the left end portion of the circuit board into the positioning groove of the positioning seat from right to left;

[0044] FIG10 is a schematic diagram of fixing the circuit board fixture in the positioning seat;

[0045] FIG11 is a schematic diagram showing that the upper ends of the two guide posts are respectively embedded in the two through holes A;

[0046] FIG12 is a schematic diagram showing two through holes B on a semi-qualified product facing downward;

[0047] FIG13 is a schematic diagram showing two guide posts respectively located below two through holes B of a semi-qualified product;

[0048] FIG14 is a schematic diagram showing that the upper ends of the two guide posts are respectively embedded in the two through holes B;

[0049] FIG15 is a schematic diagram of removing a qualified product from the positioning groove;

[0050] In the figure, 1-circuit board, 2-through hole A, 3-through hole B, 4-workbench, 5-gantry, 6-transfer mechanism, 7-linear cylinder, 8-vertical cylinder, 9-connecting plate, 10-stepping motor, 11-positioning seat, 12-positioning groove, 13-pressing cylinder, 14-pressing block, 15-detection mechanism, 16-double-acting cylinder, 17-L plate, 18-guide column, 19-movable plate, 20-displacement sensor, 21-spring, 22-signal receiver, 23-semi-qualified product. DETAILED DESCRIPTION

[0051] The present invention will be further described below with reference to the accompanying drawings, and the protection scope of the present invention is not limited to the following:

[0052] As shown in Figures 3 to 8, a high-efficiency detection device for double-sided hole position of a circuit board comprises a gantry 5 fixed on the surface of a workbench 4, a plurality of support legs supported on the ground are fixed on the bottom surface of the workbench 4, a transfer mechanism 6 for positioning and flipping the circuit board is provided on the crossbeam of the gantry 5, and the transfer mechanism 6 comprises a linear cylinder 7 fixed on the bottom surface of the crossbeam, a vertical plate fixed on the action end of the piston rod of the linear cylinder 7, and a vertical cylinder 8 fixed on the end surface of the vertical plate. The piston rod of the vertical cylinder 8 extends downward below the vertical plate, and the upper end of the extension is provided with a support leg 6 for positioning and flipping the circuit board. A connecting plate 9 is fixedly provided, and a stepping motor 10 is fixedly provided on the left end surface of the connecting plate 9. The output shaft of the stepping motor 10 passes through the connecting plate 9, and a positioning seat 11 is fixedly provided on the extended end. A positioning groove 12 is provided on the right end surface of the positioning seat 11. The positioning groove 12 matches the outer contour of the left end portion of the circuit board 1. A through groove communicating with the positioning groove 12 is provided on the top surface of the positioning seat 11. A pressing cylinder 13 is fixedly provided on the top surface of the positioning seat 11. The piston rod of the pressing cylinder 13 extends in the through groove, and a pressing block 14 is fixedly provided on the extended end. The pressing block 14 slides with the through groove;

[0053] The workbench 4 is provided with a detection mechanism 15 for detecting the hole position on the circuit board. The detection mechanism 15 includes a double-acting cylinder 16 fixed on the surface of the workbench 4. The two piston rods of the double-acting cylinder 16 are each provided with an L-plate 17 on their active ends. The vertical plate of the L-plate 17 is fixed on the active end of the piston rod of the double-acting cylinder 16. A guide column 18 is slidably installed in the horizontal plate of the L-plate 17. The outer diameter of the guide column 18 is equal to the diameter of the through hole A2. The upper end of the guide column 18 extends above the horizontal plate of the L-plate 17. The lower end of the guide column 18 is fixed with a movable plate 19. A displacement sensor 20 is installed on the bottom surface of the movable plate 19. The guide column 18 is provided with a vertically arranged spring 21. The top end of the spring 21 is fixed on the bottom surface of the horizontal plate, and the bottom end of the spring 21 is fixed on the top surface of the movable plate 19. The two displacement sensors 20 are connected to the signal receiver 22 via a signal line.

[0054] A bracket is fixed to the top surface of the positioning seat 11. The cylinder barrel of the compression cylinder 13 is fixed to the top of the bracket, and the piston rod of the compression cylinder 13 extends through the bracket. A guide seat is fixed to the top surface of the horizontal L-shaped plate 17, and the guide rod is slidably mounted within the guide seat. The two L-shaped plates 17 are symmetrically arranged about the double-acting cylinder 16, and the two guide posts 18 are symmetrically arranged about the double-acting cylinder 16.

[0055] The detection device also includes a controller, which is electrically connected to the linear cylinder 7, vertical cylinder 8, clamping cylinder 13, double-acting cylinder 16 and stepper motor 10 via signal lines. Workers can use the controller to control the extension or retraction of the piston rods of the linear cylinder 7, vertical cylinder 8, clamping cylinder 13 and double-acting cylinder 16, and can also control the start or stop of the stepper motor 10, which facilitates the workers' operation.

[0056] A method for efficiently detecting double-sided holes on a circuit board comprises the following steps:

[0057] S1. A worker takes out a circuit board 1 to be inspected, as shown in Figures 1 and 2. The worker inserts the left end of the circuit board 1 into the positioning groove 12 of the positioning seat 11 from right to left. As shown in Figure 9, the positioning groove 12 matches the outer contour of the left end of the circuit board 1, thereby achieving the positioning of the circuit board 1. At this time, the two through holes A2 on the bottom surface of the circuit board 1 are respectively located above the two guide posts 18.

[0058] S2. The worker controls the piston rod of the pressing cylinder 13 to extend downward, and the piston rod drives the pressing block 14 to move downward. The pressing block 14 passes through the through slot and presses on the circuit board 1, thereby fixing the circuit board 1 in the positioning seat 11, as shown in Figure 10;

[0059] S3. Detecting the horizontal spacing between the two through holes A2 on the circuit board 1: Control the piston rod of the vertical cylinder 8 to extend downward, which drives the connecting plate 9 to move downward. The connecting plate 9 drives the stepper motor 10 to move downward. The stepper motor 10 drives the positioning seat 11 to move downward. The positioning seat 11 drives the circuit board 1 to move downward synchronously. The two through holes A2 of the circuit board 1 move toward the two guide posts 18 respectively.

[0060] When the piston rod of the vertical cylinder 8 is fully extended, if the signal receiver 22 receives a displacement signal from the displacement sensor 20, it means that the circuit board 1 has pressed the guide column 18 downward, and the guide column 18 drives the movable plate 19 to move downward a certain distance. The movable plate 19 drives the displacement sensor 20 to move downward, and the displacement sensor 20 sends a displacement signal to the signal receiver 22. At this time, the worker determines that the horizontal spacing between the two through holes A2 of the circuit board 1 does not meet the design requirements and determines that the circuit board 1 is unqualified. The worker controls the piston rod of the pressing cylinder 13 to retract upward to separate the pressing block 14 from the circuit board 1. The worker removes the unqualified product from the positioning groove 12 and discards it after removal.

[0061] If the signal receiver 22 does not receive the displacement signal from the displacement sensor 20, it means that the circuit board 1 has not been pressed down on the guide posts 18, that is, the upper ends of the two guide posts 18 are respectively embedded in the two through holes A2, as shown in FIG11. At this time, the worker determines that the horizontal spacing between the two through holes A2 of the circuit board 1 meets the design requirements and judges the circuit board 1 as a semi-qualified product 23, thereby completing the detection of the horizontal spacing between the two through holes A2.

[0062] S4: Detection of the horizontal spacing between two through holes B3 on the semi-qualified product 23. The specific operation steps are as follows:

[0063] S41. Control the piston rod of the vertical cylinder 8 to retract upward, the piston rod drives the connecting plate 9 to move upward, the connecting plate 9 drives the stepping motor 10 to move upward, the stepping motor 10 drives the positioning seat 11 to move upward, and the positioning seat 11 drives the semi-qualified product 23 to move upward synchronously;

[0064] S42: The worker controls the stepper motor 10 to start. The output shaft of the stepper motor 10 drives the positioning seat 11 to rotate. The positioning seat 11 drives the semi-qualified product 23 to rotate synchronously. When the semi-qualified product 23 is turned 180 degrees, the controller controls the stepper motor 10 to stop. At this time, the two through holes B3 on the semi-qualified product 23 are facing downward, as shown in FIG12 .

[0065] S43: The two piston rods of the double-acting cylinder 16 of the control detection mechanism 15 are extended simultaneously. The piston rods drive the L-plate 17 to move away from the double-acting cylinder 16. The L-plate 17 drives the guide posts 18 to move synchronously. The two guide posts 18 move in opposite directions. When the two piston rods of the double-acting cylinder 16 are fully extended, the two guide posts 18 are respectively located below the two through holes B3 of the semi-qualified product, as shown in FIG13 .

[0066] S44, control the piston rod of the vertical cylinder 8 to extend downward, the piston rod drives the connecting plate 9 to move downward, the connecting plate 9 drives the stepping motor 10, the positioning seat 11 and the semi-qualified product 23 to move downward synchronously, when the piston rod of the vertical cylinder 8 is fully extended, if the signal receiver 22 receives the displacement signal from the displacement sensor 20, it means that the semi-qualified product 23 presses the guide column 18 downward, the guide column 18 drives the movable plate 19 to move downward a distance, the movable plate 19 drives the displacement sensor 20 to move downward, and the displacement sensor 20 sends a displacement signal to the signal receiver 22. At this time, the worker determines that the horizontal spacing between the two through holes B3 of the semi-qualified product 23 does not meet the design requirements and determines that the semi-qualified product 23 is a defective product. The worker controls the piston rod of the pressing cylinder 13 to retract downward to separate the pressing block 14 from the semi-qualified product 23, and the worker takes the defective product out of the positioning groove 12 and removes it after taking it out.

[0067] If the signal receiver 22 does not receive the displacement signal sent by the displacement sensor 20, it means that the semi-qualified product 23 has not been pressed down to the guide column 18, that is, the upper ends of the two guide columns 18 are respectively embedded in the two through holes B3, as shown in Figure 14. At this time, the worker determines that the horizontal spacing between the two through holes B3 of the semi-qualified product 23 meets the design requirements and judges the semi-qualified product 23 as a qualified product, thereby realizing the detection of the horizontal spacing between the two through holes B3, and finally realizing the hole position detection of a circuit board 1;

[0068] S5. Removal of qualified products: Control the piston rod of the pressing cylinder 13 to retract downward to separate the pressing block 14 from the semi-qualified products 23; after separation; control the piston rod of the vertical cylinder 8 to retract upward, the piston rod drives the connecting plate 9 to move upward, and the connecting plate 9 drives the qualified products to move upward; then control the piston rod of the linear cylinder 7 to retract to the right, the piston rod drives the vertical plate to move to the right, and then drives the vertical cylinder 8 to move to the right, and the vertical cylinder 8 drives the positioning seat 11 and the qualified products to move to the right; when the piston rod of the linear cylinder 7 is fully retracted, the worker stands on the right side of the workbench 4 to remove the qualified products from the positioning slot 12. The direction of removing the qualified products is shown in Figure 15; after removal, the qualified products are placed in the finished product basket;

[0069] S6. The worker repeats the operations of steps S1 to S5 to continuously detect the hole positions of multiple circuit boards 1.

[0070] Among them, in the process of detecting the horizontal distance between the two through holes A2 on the circuit board 1 in step S3, the worker only needs to control the piston rod of the vertical cylinder 8 to extend downward, and then observe whether there is a displacement signal sent by the displacement sensor 20 on the signal receiver 22, so as to intuitively judge whether the circuit board 1 is a defective product or a semi-qualified product; in addition, in the process of detecting the horizontal distance between the two through holes B3 on the semi-qualified product 23 in step S4, the worker only needs to control the stepper motor 10 to start, so that the semi-qualified product 23 is turned over, and then control the piston rod of the vertical cylinder 8 to extend downward, and then observe whether there is a displacement signal sent by the displacement sensor 20 on the signal receiver 22, so as to intuitively judge whether the semi-qualified product 23 is a defective product or a qualified product.

[0071] As can be seen, compared to the method of using a vernier caliper in the workshop to measure the horizontal spacing between two through holes A2 or the horizontal spacing between two through holes B3, this detection device greatly shortens the time required to detect the hole positions of a single circuit board 1, thereby greatly improving the detection efficiency of the hole positions of the circuit board 1. In addition, there is no need to manually flip the circuit board 1, which not only reduces the workload of workers, but also shortens the detection time of the hole positions of a single circuit board 1, further improving the detection efficiency of the hole positions of the circuit board 1.

[0072] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An efficient double-sided hole position detection device for a circuit board, which comprises a gantry (5) fixedly arranged on the workbench (4) tabletop, and is characterized in that: A transfer mechanism (6) for positioning and flipping the circuit board is provided on the cross beam of the gantry (5). The transfer mechanism (6) includes a linear cylinder (7) fixed on the bottom surface of the cross beam, a vertical plate fixed on the acting end of the piston rod of the linear cylinder (7), and a vertical cylinder (8) fixed on the end face of the vertical plate. The piston rod of the vertical cylinder (8) extends downward below the vertical plate, and a connecting plate (9) is fixed on the extending end. A stepping motor (10) is fixed on the left end face of the connecting plate (9). The output shaft of the stepping motor (10) penetrates through the connecting plate (9), and a positioning seat (11) is fixed on the extending end. A positioning groove (12) is formed on the right end face of the positioning seat (11), and the positioning groove (12) is matched with the outer contour of the left end of the circuit board (1). A through groove communicating with the positioning groove (12) is formed on the top surface of the positioning seat (11). A pressing cylinder (13) is fixed on the top surface of the positioning seat (11). The piston rod of the pressing cylinder (13) extends into the through groove, and a pressing block (14) is fixed on the extending end. A detection mechanism (15) for detecting the hole positions on the circuit board is provided on the workbench (4). The detection mechanism (15) includes a double-acting cylinder (16) fixed on the table surface of the workbench (4). L-shaped plates (17) are arranged on the acting ends of the two piston rods of the double-acting cylinder (16). The vertical plate of the L-shaped plate (17) is fixed on the acting end of the piston rod of the double-acting cylinder (16). A guide post (18) is slidably installed in the horizontal plate of the L-shaped plate (17). The outer diameter of the guide post (18) is equal to the diameter of the through hole A (2). The upper end of the guide post (18) extends above the horizontal plate of the L-shaped plate (17). A movable plate (19) is fixed on the lower end of the guide post (18). A displacement sensor (20) is installed on the bottom surface of the movable plate (19). A vertically arranged spring (21) is sleeved on the guide post (18). The top end of the spring (21) is fixed on the bottom surface of the horizontal plate, and the bottom end of the spring (21) is fixed on the top surface of the movable plate (19). The two displacement sensors (20) are both connected to a signal receiver (22) through signal lines.

2. The high-efficiency detection device for double-sided hole positions of a circuit board according to claim 1, wherein: A plurality of support legs supporting the ground are fixed on the bottom surface of the workbench (4).

3. The high-efficiency detection device for double-sided hole positions of a circuit board according to claim 2, characterized in that: A bracket is fixed on the top surface of the positioning seat (11). The cylinder barrel of the pressing cylinder (13) is fixed on the top of the bracket, and the piston rod of the pressing cylinder (13) penetrates through the bracket.

4. The high-efficiency detection device for double-sided hole positions of a circuit board according to claim 3, wherein: The pressing block (14) is slidably matched with the through groove.

5. The high-efficiency detection device for double-sided hole positions of a circuit board according to claim 4, wherein: A guide seat is fixed on the top surface of the horizontal plate of the L-shaped plate (17), and the guide rod is slidably installed in the guide seat.

6. The high-efficiency detection device for double-sided hole positions of a circuit board according to claim 5, wherein: The two L-shaped plates (17) are symmetrically arranged about the double-acting cylinder (16) left and right, and the two guide posts (18) are symmetrically arranged about the double-acting cylinder (16) left and right.

7. An efficient double-sided hole position detection device for a circuit board according to claim 6, characterized in that: The detection device further includes a controller, and the controller is electrically connected to the linear cylinder (7), the vertical cylinder (8), the pressing cylinder (13), the double-acting cylinder (16), and the stepping motor (10) through signal lines.

8. A method for efficient detection of double-sided hole positions on a circuit board, using the device for efficient detection of double-sided hole positions on a circuit board described in claim 7, characterized in that: It includes the following steps: S1. The worker takes out a circuit board (1) to be detected. The worker inserts the left end of the circuit board (1) into the positioning groove (12) of the positioning seat (11) from right to left. Since the positioning groove (12) matches the outer contour of the left end of the circuit board (1), the positioning of the circuit board (1) is achieved. At this time, the two through holes A (2) on the bottom surface of the circuit board (1) are respectively located above the two guide posts (18). S2. The worker controls the piston rod of the pressing cylinder (13) to extend downward. The piston rod drives the pressing block (14) to move downward. The pressing block (14) passes through the through slot and presses on the circuit board (1), thereby fixing the circuit board (1) tooling in the positioning seat (11). S3. Detection of the horizontal distance between the two through holes A (2) on the circuit board (1): Control the piston rod of the vertical cylinder (8) to extend downward. The piston rod drives the connecting plate (9) to move downward. The connecting plate (9) drives the stepping motor (10) to move downward. The stepping motor (10) drives the positioning seat (11) to move downward. The positioning seat (11) drives the circuit board (1) to move downward synchronously. The two through holes A (2) of the circuit board (1) move respectively towards the directions of the two guide posts (18). When the piston rod of the vertical cylinder (8) is fully extended, if the signal receiver (22) receives the displacement signal sent by the displacement sensor (20), it indicates that the circuit board (1) has pressed down the guide post (18). The guide post (18) drives the movable plate (19) to move downward by a certain distance. The movable plate (19) drives the displacement sensor (20) to move downward. The displacement sensor (20) sends a displacement signal to the signal receiver (22). At this time, the worker determines that the horizontal distance between the two through holes A (2) of the circuit board (1) does not meet the design requirements and determines that the circuit board (1) is a defective product. The worker controls the piston rod of the pressing cylinder (13) to retract upward so that the pressing block (14) is separated from the circuit board (1). The worker takes out the defective product from the positioning groove (12). After taking it out, the defective product is removed. If the signal receiver (22) does not receive the displacement signal sent by the displacement sensor (20), it indicates that the circuit board (1) has not pressed down the guide post (18), that is, the upper ends of the two guide posts (18) are respectively inserted into the two through holes A (2). At this time, the worker determines that the horizontal distance between the two through holes A (2) of the circuit board (1) meets the design requirements and determines that the circuit board (1) is a semi - qualified product (23), thus achieving the detection of the horizontal distance between the two through holes A (2). S4. Detection of the horizontal distance between the two through holes B (3) on the semi - qualified product (23). The specific operation steps are as follows: S41. Control the piston rod of the vertical cylinder (8) to retract upward. The piston rod drives the connecting plate (9) to move upward. The connecting plate (9) drives the stepping motor (10) to move upward. The stepping motor (10) drives the positioning seat (11) to move upward. The positioning seat (11) drives the semi - qualified product (23) to move upward synchronously. S42. The worker controls the stepping motor (10) to start. The output shaft of the stepping motor (10) drives the positioning seat (11) to rotate. The positioning seat (11) drives the semi-finished product (23) to rotate synchronously. When the semi-finished product (23) is flipped 180°, the controller controls the stepping motor (10) to turn off. At this time, both through holes B (3) on the semi-finished product (23) face downward. S43. Control the two piston rods of the double-acting cylinder (16) of the detection mechanism (15) to extend simultaneously. The piston rods drive the L-shaped plate (17) to move away from the double-acting cylinder (16). The L-shaped plate (17) drives the guide posts (18) to move synchronously. The two guide posts (18) move in opposite directions. When the two piston rods of the double-acting cylinder (16) are fully extended, the two guide posts (18) are respectively located below the two through holes B (3) of the semi-finished product. S44. Control the piston rod of the vertical cylinder (8) to extend downward. The piston rod drives the connecting plate (9) to move downward. The connecting plate (9) drives the stepping motor (10), the positioning seat (11) and the semi-finished product (23) to move downward synchronously. When the piston rod of the vertical cylinder (8) is fully extended, if the signal receiver (22) receives the displacement signal sent by the displacement sensor (20), it indicates that the semi-finished product (23) has pressed down the guide posts (18). The guide posts (18) drive the movable plate (19) to move downward by a certain distance. The movable plate (19) drives the displacement sensor (20) to move downward. The displacement sensor (20) sends a displacement signal to the signal receiver (22). At this time, the worker determines that the horizontal distance between the two through holes B (3) of the semi-finished product (23) does not meet the design requirements and determines that the semi-finished product (23) is a defective product. The worker controls the piston rod of the pressing cylinder (13) to retract downward so that the pressing block (14) is separated from the semi-finished product (23). The worker takes out the defective product from the positioning groove (12). After taking it out, the defective product is removed. If the signal receiver (22) does not receive the displacement signal sent by the displacement sensor (20), it indicates that the semi-finished product (23) has not pressed down the guide posts (18), that is, the upper ends of the two guide posts (18) are respectively inserted into the two through holes B (3). At this time, the worker determines that the horizontal distance between the two through holes B (3) of the semi-finished product (23) meets the design requirements and determines that the semi-finished product (23) is a qualified product, thus realizing the detection of the horizontal distance between the two through holes B (3), and finally realizing the hole position detection of a circuit board (1). S5. Removal of qualified products: Control the piston rod of the pressing cylinder (13) to retract downward so that the pressing block (14) is separated from the semi-finished product (23); after separation, control the piston rod of the vertical cylinder (8) to retract upward. The piston rod drives the connecting plate (9) to move upward, and the connecting plate (9) drives the qualified product to move upward; then control the piston rod of the linear cylinder (7) to retract to the right. The piston rod drives the vertical plate to move to the right, and further drives the vertical cylinder (8) to move to the right. The vertical cylinder (8) drives the positioning seat (11) and the qualified product to move to the right; when the piston rod of the linear cylinder (7) is fully retracted, the worker stands on the right side of the workbench (4) and takes out the qualified product from the positioning groove (12); after taking out, put the qualified product into the finished product basket; S6. The worker repeats the operations in steps S1 to S5 in this way, and the hole position detection of multiple circuit boards (1) can be continuously realized.

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