A PCB board inspection device with intelligent positioning function

Abstract

The application discloses a kind of detection equipment with intelligent positioning function for PCB, it is related to circuit board detection technical field, including case, drive unit, cleaning unit, positioning unit and holding unit, wherein case is used to install and fix drive unit, cleaning unit, positioning unit and holding unit, drive unit is used to provide power source, cleaning unit is used to clean before each detection of probe, positioning unit is used for intelligent positioning calibration of circuit board, holding unit is used for circuit board to keep stable, after circuit board is placed, probe is driven to move down by drive unit and is detected, probe is cleaned by cleaning unit, the position of circuit board is recalibrated by positioning unit, avoid deviation due to placement and cause probe detection process to have problem, ensure that circuit board does not deviate due to equipment vibration and other problems in detection process by holding unit, so as to cause probe to be unable to accurately insert pad, cause probe to be bent and damaged.

Description

Technical Field

[0001] This invention relates to the field of circuit board testing technology, specifically a PCB board testing device with intelligent positioning function. Background Technology

[0002] In the automated testing of PCBs, flying probe testing or bed-of-nails testing are widely used techniques. During this process, the test probes need to make precise physical contact with pre-set pads on the PCB to complete electrical performance testing. However, existing technologies face a series of interconnected and long-standing technical challenges in this stage, severely impacting the reliability, efficiency, and cost of the testing.

[0003] After repeated contact with solder pads, test probes easily accumulate flux residue, oxide layers, and environmental dust on their tips. These contaminants form an insulating film, leading to increased contact resistance between the probe and the solder pad, signal instability, and even misinterpretations. Currently, the common solution is periodic manual cleaning, which not only increases equipment complexity and cycle time but also represents a passive, offline maintenance method.

[0004] Initial positional deviations may still exist in the PCB board during placement. Furthermore, minute vibrations generated during equipment operation can also cause slight displacement or rotation of the PCB board. Such microscopic misalignments are fatal for high-density, small-pitch pads. Existing positioning systems often lack the ability to recorrect these minute misalignments, causing probes to misalign with the pad center. This can range from affecting contact quality to directly impacting the pad edge, causing probe bending or even breakage. When the probe is pressed down, if the PCB board experiences slight "drift" or "warping" due to insecure positioning, the probe is subjected to lateral force and is prone to elastic bending. Repeated bending leads to probe fatigue failure, while instantaneous overload directly causes permanent bending or breakage of the probe. Summary of the Invention

[0005] The purpose of this invention is to provide a PCB board inspection device with intelligent positioning function to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The PCB board inspection equipment with intelligent positioning function includes a chassis, a drive unit, a cleaning unit, a positioning unit, and a holding unit. The chassis is placed on a horizontal ground. The drive unit is fixedly connected to the chassis, the drive unit is fixedly connected to the cleaning unit, the cleaning unit is fixedly connected to the chassis, the positioning unit is fixedly connected to the chassis, and the positioning unit is fixedly connected to the holding unit. The positioning unit has the function of repositioning the circuit board, and the holding unit is fixedly connected to the chassis.

[0008] The chassis is used to install and fix the drive unit, cleaning unit, positioning unit, and holding unit. The drive unit provides the power source, the cleaning unit cleans the probes before each test, the positioning unit is used for intelligent positioning and calibration of the circuit board, and the holding unit keeps the circuit board stable. After the circuit board is placed, the drive unit moves the probes down for testing, the cleaning unit cleans the probes, and the positioning unit recalibrates the position of the circuit board to avoid problems in the probe testing process due to placement deviations. The holding unit ensures that the circuit board will not shift during the testing process due to equipment vibration or other issues, which could cause the probes to fail to insert accurately into the pads and cause probe bending damage.

[0009] Furthermore, the drive unit includes an electric telescopic rod, a fixed plate, a probe, a mounting plate, and a drive wedge. The fixed end of the electric telescopic rod is fixedly mounted on the chassis, and the telescopic end of the electric telescopic rod is fixedly connected to the fixed plate. One end of the probe is fixedly connected to the fixed plate. The mounting plate is fixedly connected to the fixed plate via a cylinder. The drive wedge is fixedly mounted on the end of the mounting plate. In the vertical direction, the length of the drive wedge at the end closer to the horizontal ground is less than the length at the end farther from the horizontal ground.

[0010] The controller controls the extension of the electric telescopic rod, which in turn drives the fixing plate, mounting plate and probe to move downward synchronously until the probe is inserted into the solder pad for testing.

[0011] Furthermore, the cleaning unit includes a bent rod, a sleeve, an electromagnet, a straight column, a drive coil, and a magnetic block. One end of the bent rod is fixedly connected to a fixed plate, and the other end of the bent rod is fixedly connected to a sleeve. The sleeve is fixedly connected to the electromagnet, and the electromagnet is slidably connected to the straight column. The straight column is slidably installed inside the housing. The drive coil is evenly wound around the end of the straight column away from the horizontal ground. The magnetic block is slidably installed on the straight column, and the electromagnet has a built-in conductive slip ring.

[0012] Furthermore, the cleaning unit also includes a buffer spring, a connecting plate, an electric spring telescopic rod, a cleaning plate, a fixed conductive block, a movable conductive block, and a telescopic spring. One end of the buffer spring is fixedly connected to a magnetic block, and the other end of the buffer spring is fixedly connected to the chassis. Both ends of the connecting plate are fixedly connected to magnetic blocks. The fixed end of the electric spring telescopic rod is fixedly mounted on the connecting plate, and the output end of the electric spring telescopic rod is fixedly connected to the cleaning plate. The fixed conductive block is fixedly mounted inside the chassis and is slidably connected to the straight column. The movable conductive block is fixedly connected to the end of the straight column near the horizontal ground. One end of the telescopic spring is fixedly connected to the chassis, and the other end of the telescopic spring is fixedly connected to the movable conductive block. The fixed conductive block is electrically connected to the electric spring telescopic rod.

[0013] Initially, the fixed conductive block and the moving conductive block are in contact. The controller's current is transmitted to the electric spring telescopic rod through the moving and fixed conductive blocks, at which point the electric spring telescopic rod is in an extended state. As the fixed plate moves downward, the probe is inserted into the cleaning plate for pre-test cleaning. The fixed plate continues to move downward, and under the transmission action of the bent rod, it drives the sleeve downward, causing the electromagnet to contact the drive coil as it slides along the straight column. At this time, the current in the drive coil is transmitted to the electromagnet through the conductive slip ring, causing the electromagnet to be energized and exhibit the same polarity as the magnetic block. Thus, under the repulsion of like poles, the electromagnet drives the magnetic block downward while compressing the buffer spring. Simultaneously, under the transmission action of the connecting plate, the magnetic block drives the electric spring telescopic rod and the cleaning plate to move downward synchronously. As the sleeve continues to move downward, the sleeve squeezes the straight column, causing the moving conductive block to move downward, separating the moving conductive block from the fixed conductive block and interrupting the current supplied to the electric spring telescopic rod. At this time, the electric spring telescopic rod, under the action of its own restoring force, causes the cleaning plate to retract, avoiding the downward detection action of the probe.

[0014] Furthermore, the positioning unit includes a placement platform, a slider, a positioning plate, a guide rod, and a connecting rod. The placement platform is fixedly installed inside the chassis by a cylinder. A rectangular groove is provided on the placement platform, and a guide rod is provided in the rectangular groove of the placement platform. The slider is slidably installed on the guide rod. The positioning plate is fixedly connected to the slider, and the connecting rod is fixedly connected to the slider. A circuit board holding groove is provided on the placement platform, and ventilation holes are evenly provided on the circuit board holding groove.

[0015] Furthermore, the positioning unit also includes a rotating plate, a rotating rod, a spiral spring, a movable wedge, and a slide groove. The rotating plate is fixedly connected to the connecting rod, and the rotating plate is fixedly connected to the rotating rod. The rotating rod is rotatably mounted on the chassis. One end of the spiral spring is fixedly connected to the rotating rod, and the other end of the spiral spring is fixedly connected to the movable wedge. The movable wedge is slidably mounted in the slide groove, and the slide groove is fixedly mounted on the chassis.

[0016] As the mounting plate continues to move downwards, the drive wedge first contacts the moving wedge and pushes the moving wedge to move outwards along the slide groove, while simultaneously pulling the spiral spring. This causes the rotating rod and the rotating plate to rotate at a certain angle. Under the transmission action of the connecting rod, the slider is pulled to slide along the guide rod, causing the positioning plate to move towards the center of the placement stage. This recalibrates the offset of the circuit board caused by placement or machine vibration, repositioning the circuit board to the theoretical center position and preventing the probe from being unable to be accurately inserted into the pad, thus avoiding probe bending and damage.

[0017] Furthermore, the holding unit includes a pressure plate, a push rod, a movable plate, a return spring, a conduit, and a vacuum chamber. The pressure plate is fixedly connected to the push rod, the push rod is slidably connected to the vacuum chamber, the push rod is fixedly connected to the movable plate, and the movable plate is slidably installed inside the vacuum chamber. One end of the conduit is electrically connected to the vacuum chamber located above the movable plate, and the other end of the conduit is electrically connected to the vent hole of the circuit board holding slot on the placement platform. The vacuum chamber is equipped with a one-way inlet valve and a one-way outlet valve, and the one-way inlet valve is located inside the conduit.

[0018] Since the sleeve is in contact with the straight column at this time, the electromagnet does not undergo relative displacement with the straight column, so the current received by the electromagnet remains consistent. As the sleeve drives the electromagnet to move downward, the magnetic block drives the connecting plate to move downward synchronously. At this time, the connecting plate contacts the pressure plate and pushes the pressure plate downward. Thus, under the transmission action of the push rod, the moving plate moves downward to squeeze the reset spring, drawing the air between the repositioned circuit board and the circuit board holding slot of the placement platform into the vacuum chamber. This maintains the state of the circuit board and prevents the probe from shaking or shifting during subsequent probe insertion into the pad, which could cause the probe to fail to be inserted vertically into the pad and result in probe damage.

[0019] Furthermore, in the vertical direction, the length of the moving wedge near the horizontal ground is less than the length of the end away from the horizontal ground.

[0020] In order to make the moving wedge contact the driving wedge and generate a certain displacement, thereby pulling the spiral spring, the slider drives the positioning plate to recalibrate the position of the circuit board, thus realizing the intelligent positioning of the circuit board.

[0021] Furthermore, the end of the drive coil furthest from the horizontal ground is the current input terminal.

[0022] In order to provide a large current to the electromagnet so that it is quickly energized and has the same polarity as the magnetic block, the magnetic block is quickly pushed to move the cleaning plate downwards, so that the probe is separated from the cleaning plate and the cleaning plate is prepared to avoid the probe when it descends.

[0023] Furthermore, a controller is installed inside the chassis, and a control console is installed on the outer surface of the chassis.

[0024] To automate the operation of the equipment, save manpower, and improve work efficiency.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. In this invention, the fixed conductive block and the movable conductive block are initially in contact. The controller's current is transmitted to the electric spring telescopic rod through the movable and fixed conductive blocks, at which point the electric spring telescopic rod is in an extended state. As the fixed plate moves downward, the probe is inserted into the cleaning plate for pre-test cleaning. The fixed plate continues to move downward, and under the transmission action of the bent rod, it drives the sleeve downward, causing the electromagnet to contact the drive coil as it slides along the straight column. At this time, the current of the drive coil is transmitted to the electromagnet through the conductive slip ring, causing the electromagnet to be energized and exhibit the same polarity as the magnetic block. Thus, under the repulsion of like poles, the electromagnet drives the magnetic block to move downward while compressing the buffer spring. Simultaneously, under the transmission action of the connecting plate, the magnetic block drives the electric spring telescopic rod and the cleaning plate to move downward synchronously. As the sleeve continues to move downward, the sleeve squeezes the straight column, causing the movable conductive block to move downward, separating the movable conductive block from the fixed conductive block and interrupting the current supplied to the electric spring telescopic rod. At this time, the electric spring telescopic rod, under the action of its own restoring force, causes the cleaning plate to retract, avoiding the downward detection action of the probe.

[0027] 2. In this invention, as the mounting plate moves downward continuously, the driving wedge first contacts the moving wedge and pushes the moving wedge to move outward along the slide groove while pulling the spiral spring. This causes the rotating rod and the rotating plate to rotate at a certain angle. Under the transmission action of the connecting rod, the slider is pulled to slide along the guide rod, causing the positioning plate to move towards the center of the placement stage. This recalibrates the offset of the circuit board caused by placement or machine vibration, and repositions the circuit board to the theoretical center position, avoiding the situation where the probe cannot be accurately inserted into the pad, causing the probe to bend and be damaged.

[0028] 3. In this invention, because the sleeve is in contact with the straight column at this time, the electromagnet does not undergo relative displacement with the straight column, so the current received by the electromagnet remains consistent. As the sleeve drives the electromagnet to move downward, the magnetic block drives the connecting plate to move downward synchronously. At this time, the connecting plate contacts the pressure plate and pushes the pressure plate downward. Under the transmission action of the push rod, the moving plate moves downward to squeeze the reset spring, drawing the air between the repositioned circuit board and the circuit board holding slot of the placement platform into the vacuum chamber. This maintains the state of the circuit board and avoids the subsequent probe insertion into the pads due to jitter and displacement, which could cause the probe to fail to be inserted vertically into the pads and result in probe damage. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the internal structure of the chassis of the present invention;

[0031] Figure 3 for Figure 2 A partial enlarged view of the structure at point A in the middle;

[0032] Figure 4 This is a schematic diagram of the internal structure of the chassis of the present invention from another perspective;

[0033] Figure 5 for Figure 4 A partial enlarged view of the structure at point B in the middle;

[0034] Figure 6 for Figure 4 A partial enlarged view of the structure at point C;

[0035] Figure 7 This is a schematic diagram of the external structure of some positioning units of the present invention;

[0036] Figure 8 for Figure 7 A partial enlarged view of the structure at point D;

[0037] Figure 9 This is a schematic diagram of the placement platform of the present invention viewed from bottom to top.

[0038] In the diagram: 1. Chassis; 2. Drive unit; 21. Electric telescopic rod; 22. Fixing plate; 23. Probe; 24. Mounting plate; 25. Drive wedge; 3. Cleaning unit; 31. Bent rod; 32. Sleeve; 33. Electromagnet; 34. Straight column; 35. Drive coil; 36. Magnetic block; 37. Buffer spring; 38. Connecting plate; 39. Electric spring telescopic rod; 310. Cleaning plate; 311. Fixed conductive block; 312. Moving conductive block; 313. Telescopic spring; 4. Positioning unit; 41. Placement platform; 42. Slider; 43. Positioning plate; 44. Guide rod; 45. Connecting rod; 46. Rotating plate; 47. Rotating rod; 48. Spiral spring; 49. Moving wedge; 410. Slide groove; 5. Holding unit; 51. Pressure plate; 52. Push rod; 53. Moving plate; 54. Return spring; 55. Conduit; 56. Vacuum box. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example: Figures 1-9 As shown, the present invention provides a technical solution:

[0041] like Figure 1 , Figure 2 , Figure 4As shown, a PCB board inspection device with intelligent positioning function includes a chassis 1, a drive unit 2, a cleaning unit 3, a positioning unit 4, and a holding unit 5. The chassis 1 is placed on a horizontal ground. The drive unit 2 is fixedly connected to the chassis 1, the drive unit 2 is fixedly connected to the cleaning unit 3, the cleaning unit 3 is fixedly connected to the chassis 1, the positioning unit 4 is fixedly connected to the chassis 1, and the positioning unit 4 is fixedly connected to the holding unit 5. The positioning unit 4 has the function of repositioning the circuit board, and the holding unit 5 is fixedly connected to the chassis 1.

[0042] The chassis 1 is used to install and fix the drive unit 2, cleaning unit 3, positioning unit 4 and holding unit 5. The drive unit 2 is used to provide a power source. The cleaning unit 3 is used to clean the probe 23 before each test. The positioning unit 4 is used for intelligent positioning and calibration of the circuit board. The holding unit 5 is used to keep the circuit board stable. After the circuit board is placed, the drive unit 2 drives the probe 23 to move down for testing. The cleaning unit 3 cleans the probe 23. The positioning unit 4 recalibrates the position of the circuit board to avoid problems in the probe 23 testing process due to placement deviation. The holding unit 5 ensures that the circuit board will not shift due to equipment vibration or other problems during the testing process, so as not to cause the probe 23 to fail to insert accurately into the pad, causing the probe 23 to bend and be damaged.

[0043] like Figure 2 As shown, the drive unit 2 includes an electric telescopic rod 21, a fixed plate 22, a probe 23, a mounting plate 24, and a drive wedge 25. The fixed end of the electric telescopic rod 21 is fixedly installed on the housing 1, and the telescopic end of the electric telescopic rod 21 is fixedly connected to the fixed plate 22. One end of the probe 23 is fixedly connected to the fixed plate 22. The mounting plate 24 is fixedly connected to the fixed plate 22 through a cylinder. The drive wedge 25 is fixedly installed at the end of the mounting plate 24. In the vertical direction, the length of the end of the drive wedge 25 closer to the horizontal ground is less than the length of the end farther from the horizontal ground.

[0044] The controller controls the extension of the electric telescopic rod 21, thereby driving the fixing plate 22, the mounting plate 24 and the probe 23 to move downward synchronously until the probe 23 is inserted into the pad for testing.

[0045] like Figure 3 As shown, the cleaning unit 3 includes a bent rod 31, a sleeve 32, an electromagnet 33, a straight column 34, a drive coil 35, and a magnetic block 36. One end of the bent rod 31 is fixedly connected to the fixing plate 22, and the other end of the bent rod 31 is fixedly connected to the sleeve 32. The sleeve 32 is fixedly connected to the electromagnet 33, and the electromagnet 33 is slidably connected to the straight column 34. The straight column 34 is slidably installed inside the housing 1. The drive coil 35 is evenly wound around the end of the straight column 34 away from the horizontal ground. The magnetic block 36 is slidably installed on the straight column 34. The electromagnet 33 has a built-in conductive slip ring.

[0046] like Figure 3 , Figure 5 As shown, the cleaning unit 3 also includes a buffer spring 37, a connecting plate 38, an electric spring telescopic rod 39, a cleaning plate 310, a fixed conductive block 311, a movable conductive block 312, and a telescopic spring 313. One end of the buffer spring 37 is fixedly connected to the magnetic block 36, and the other end of the buffer spring 37 is fixedly connected to the housing 1. Both ends of the connecting plate 38 are fixedly connected to the magnetic block 36. The fixed end of the electric spring telescopic rod 39 is fixedly installed on the connecting plate 38, and the output end of the electric spring telescopic rod 39 is fixedly connected to the cleaning plate 310. The fixed conductive block 311 is fixedly installed inside the housing 1 and is slidably connected to the straight column 34. The movable conductive block 312 is fixedly connected to the end of the straight column 34 near the horizontal ground. One end of the telescopic spring 313 is fixedly connected to the housing 1, and the other end of the telescopic spring 313 is fixedly connected to the movable conductive block 312. The fixed conductive block 311 is electrically connected to the electric spring telescopic rod 39.

[0047] Initially, the fixed conductive block 311 and the movable conductive block 312 are in contact. The controller current is transmitted to the electric spring telescopic rod 39 through the movable conductive block 312 and the fixed conductive block 311. At this time, the electric spring telescopic rod 39 is in the extended state. During the downward movement of the fixed plate 22, the probe 23 is inserted into the cleaning plate 310 for pre-test cleaning. The fixed plate 22 continues to move downward, and under the transmission action of the bent rod 31, it drives the sleeve 32 to move downward, so that the electromagnet 33 contacts the drive coil 35 during the sliding along the straight column 34. At this time, the current of the drive coil 35 is transmitted to the electromagnet 33 through the conductive slip ring, so that the electromagnet 33 is... The electric current exhibits the same polarity as the magnetic block 36. Thus, under the repulsive force of like poles, the electromagnet 33 drives the magnetic block 36 to move downward while compressing the buffer spring 37. At the same time, the magnetic block 36, under the transmission action of the connecting plate 38, drives the electric spring telescopic rod 39 and the cleaning plate 310 to move downward synchronously. When the sleeve 32 continues to move downward, the sleeve 32 squeezes the straight column 34, causing the moving conductive block 312 to move downward, separating the moving conductive block 312 from the fixed conductive block 311, interrupting the current supplied to the electric spring telescopic rod 39. At this time, the electric spring telescopic rod 39, under the action of its own restoring force, drives the cleaning plate 310 to retract, avoiding the downward detection action of the probe 23.

[0048] like Figures 7-9 As shown, the positioning unit 4 includes a placement platform 41, a slider 42, a positioning plate 43, a guide rod 44, and a connecting rod 45. The placement platform 41 is fixedly installed in the housing 1 by a cylinder. A rectangular groove is provided on the placement platform 41. The guide rod 44 is provided in the rectangular groove of the placement platform 41. The slider 42 is slidably installed on the guide rod 44. The positioning plate 43 is fixedly connected to the slider 42. The connecting rod 45 is fixedly connected to the slider 42. A circuit board holding groove is provided on the placement platform 41. Ventilation holes are evenly provided on the circuit board holding groove.

[0049] like Figures 7-9 As shown, the positioning unit 4 also includes a rotating plate 46, a rotating rod 47, a spiral spring 48, a movable wedge 49, and a slide groove 410. The rotating plate 46 is fixedly connected to the connecting rod 45, and the rotating plate 46 is fixedly connected to the rotating rod 47. The rotating rod 47 is rotatably mounted on the housing 1. One end of the spiral spring 48 is fixedly connected to the rotating rod 47, and the other end of the spiral spring 48 is fixedly connected to the movable wedge 49. The movable wedge 49 is slidably mounted in the slide groove 410, and the slide groove 410 is fixedly mounted on the housing 1.

[0050] As the mounting plate 24 continues to move downward, the drive wedge 25 first contacts the moving wedge 49 and pushes the moving wedge 49 to move outward along the slide groove 410, while simultaneously pulling the spiral spring 48. This causes the rotating rod 47 and the rotating plate 46 to rotate at a certain angle. Under the transmission action of the connecting rod 45, the slider 42 is pulled to slide along the guide rod 44, causing the positioning plate 43 to move towards the center of the placement stage 41. This recalibrates the offset of the circuit board caused by placement or machine vibration, repositioning the circuit board to the theoretical center position and preventing the probe 23 from being unable to be accurately inserted into the pad, thus avoiding the situation where the probe 23 is bent and damaged.

[0051] like Figure 6 As shown, the holding unit 5 includes a pressure plate 51, a push rod 52, a moving plate 53, a return spring 54, a conduit 55, and a vacuum chamber 56. The pressure plate 51 is fixedly connected to the push rod 52, the push rod 52 is slidably connected to the vacuum chamber 56, the push rod 52 is fixedly connected to the moving plate 53, and the moving plate 53 is slidably installed inside the vacuum chamber 56. One end of the conduit 55 is connected to the vacuum chamber 56 located above the moving plate 53, and the other end of the conduit 55 is connected to the vent hole of the circuit board holding slot of the placement platform 41. The vacuum chamber 56 is equipped with a one-way inlet valve and a one-way outlet valve, and the one-way inlet valve is located inside the conduit 55.

[0052] Since the sleeve 32 is in contact with the straight column 34 at this time, the electromagnet 33 does not undergo relative displacement with the straight column 34, so the current received by the electromagnet 33 remains consistent. During the process of the sleeve 32 driving the electromagnet 33 to move downward, the magnetic block 36 drives the connecting plate 38 to move downward synchronously. At this time, the connecting plate 38 contacts the pressure plate 51 and pushes the pressure plate 51 to move downward. Thus, under the transmission action of the push rod 52, the moving plate 53 moves downward to squeeze the reset spring 54, and draws the air between the repositioned circuit board and the circuit board holding slot of the placement platform 41 into the vacuum box 56, thereby maintaining the state of the circuit board and avoiding the subsequent vibration and displacement of the probe 23 during the insertion of the solder pad, which would cause the probe 23 to be unable to be inserted vertically into the solder pad and result in damage to the probe 23.

[0053] like Figure 7As shown, in the vertical direction, the length of the moving wedge 49 at the end closer to the horizontal ground is less than the length at the end farther from the horizontal ground.

[0054] In order to make the moving wedge 49 contact the driving wedge 25 and generate a certain displacement, thereby pulling the spiral spring 48, the slider 42 drives the positioning plate 43 to recalibrate the position of the circuit board, thus realizing the intelligent positioning of the circuit board.

[0055] like Figure 3 As shown, the end of the drive coil 35 furthest from the horizontal ground is the current input terminal.

[0056] In order to provide a large current to the electromagnet 33 so that the electromagnet 33 is quickly energized and presents the same polarity as the magnetic block 36, the magnetic block 36 is quickly pushed to move the cleaning plate 310 downward, so that the probe 23 is separated from the cleaning plate 310, in preparation for the subsequent descent of the cleaning plate 310 to avoid the probe 23.

[0057] like Figure 1 As shown, a controller is installed inside the chassis 1, and a control panel is installed on the outer surface of the chassis 1.

[0058] To automate the operation of the equipment, save manpower, and improve work efficiency.

[0059] Working principle of the invention:

[0060] Initially, the fixed conductive block 311 and the movable conductive block 312 are in contact. The controller current is transmitted to the electric spring telescopic rod 39 through the movable conductive block 312 and the fixed conductive block 311. At this time, the electric spring telescopic rod 39 is in the extended state. During the downward movement of the fixed plate 22, the probe 23 is inserted into the cleaning plate 310 for pre-test cleaning. The fixed plate 22 continues to move downward, and under the transmission action of the bent rod 31, it drives the sleeve 32 to move downward, so that the electromagnet 33 contacts the drive coil 35 during the sliding along the straight column 34. At this time, the current of the drive coil 35 is transmitted to the electromagnet 33 through the conductive slip ring, so that the electromagnet 33 is... The electric current exhibits the same polarity as the magnetic block 36. Thus, under the repulsive force of like poles, the electromagnet 33 drives the magnetic block 36 to move downward while compressing the buffer spring 37. At the same time, the magnetic block 36, under the transmission action of the connecting plate 38, drives the electric spring telescopic rod 39 and the cleaning plate 310 to move downward synchronously. When the sleeve 32 continues to move downward, the sleeve 32 squeezes the straight column 34, causing the moving conductive block 312 to move downward, separating the moving conductive block 312 from the fixed conductive block 311, interrupting the current supplied to the electric spring telescopic rod 39. At this time, the electric spring telescopic rod 39, under the action of its own restoring force, drives the cleaning plate 310 to retract, avoiding the downward detection action of the probe 23.

[0061] As the mounting plate 24 continues to move downward, the drive wedge 25 first contacts the moving wedge 49 and pushes the moving wedge 49 to move outward along the slide groove 410, while simultaneously pulling the spiral spring 48. This causes the rotating rod 47 and the rotating plate 46 to rotate at a certain angle. Under the transmission action of the connecting rod 45, the slider 42 is pulled to slide along the guide rod 44, causing the positioning plate 43 to move towards the center of the placement stage 41. This recalibrates the offset of the circuit board caused by placement or machine vibration, repositioning the circuit board to the theoretical center position and preventing the probe 23 from being unable to be accurately inserted into the pad, thus avoiding the situation where the probe 23 is bent and damaged.

[0062] Since the sleeve 32 is in contact with the straight column 34 at this time, the electromagnet 33 does not undergo relative displacement with the straight column 34, so the current received by the electromagnet 33 remains consistent. During the process of the sleeve 32 driving the electromagnet 33 to move downward, the magnetic block 36 drives the connecting plate 38 to move downward synchronously. At this time, the connecting plate 38 contacts the pressure plate 51 and pushes the pressure plate 51 to move downward. Thus, under the transmission action of the push rod 52, the moving plate 53 moves downward to squeeze the reset spring 54, and draws the air between the repositioned circuit board and the circuit board holding slot of the placement platform 41 into the vacuum box 56, thereby maintaining the state of the circuit board and avoiding the subsequent vibration and displacement of the probe 23 during the insertion of the solder pad, which would cause the probe 23 to be unable to be inserted vertically into the solder pad and result in damage to the probe 23.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A detection device for PCB board with intelligent positioning function, characterized in that: The detection equipment with intelligent positioning function for PCB, including case (1), drive unit (2), cleaning unit (3), positioning unit (4) and holding unit (5), the case (1) is placed on the horizontal ground, the drive unit (2) is fixedly connected with case (1), the drive unit (2) is fixedly connected with cleaning unit (3), the cleaning unit (3) is fixedly connected with case (1), the positioning unit (4) is fixedly connected with case (1), the positioning unit (4) is fixedly connected with holding unit (5), the positioning unit (4) has the function of repositioning for circuit board, the holding unit (5) is fixedly connected with case (1); The cleaning unit (3) includes a bent rod (31), a sleeve (32), an electromagnet (33), a straight column (34), a drive coil (35) and a magnetic block (36), one end of the bent rod (31) is fixedly connected with the fixed plate (22), the other end of the bent rod (31) is fixedly connected with the sleeve (32), the sleeve (32) is fixedly connected with the electromagnet (33), the electromagnet (33) is slidably connected with the straight column (34), the straight column (34) is slidably installed in the case (1), the drive coil (35) is uniformly wound on the end of the straight column (34) away from the horizontal ground, the magnetic block (36) is slidably installed on the straight column (34), and the electromagnet (33) is provided with a conductive slip ring; The cleaning unit (3) further includes a buffer spring (37), a connecting plate (38), an electric spring telescopic rod (39), a cleaning plate (310), a fixed conductive block (311), a movable conductive block (312) and a telescopic spring (313), one end of the buffer spring (37) is fixedly connected with the magnetic block (36), the other end of the buffer spring (37) is fixedly connected with the case (1), both ends of the connecting plate (38) are fixedly connected with the magnetic block (36), the fixed end of the electric spring telescopic rod (39) is fixedly installed on the connecting plate (38), the output end of the electric spring telescopic rod (39) is fixedly connected with the cleaning plate (310), the fixed conductive block (311) is fixedly installed in the case (1), the fixed conductive block (311) is slidably connected with the straight column (34), the movable conductive block (312) is fixedly connected with the end of the straight column (34) close to the horizontal ground, one end of the telescopic spring (313) is fixedly connected with the case (1), the other end of the telescopic spring (313) is fixedly connected with the movable conductive block (312), and the fixed conductive block (311) is electrically connected with the electric spring telescopic rod (39).

2. The detection device with intelligent positioning function for PCB according to claim 1, characterized in that: The driving unit (2) includes an electric telescopic rod (21), a fixed plate (22), a probe (23), a mounting plate (24) and a driving wedge (25), the fixed end of the electric telescopic rod (21) is fixedly installed on the case (1), the telescopic end of the electric telescopic rod (21) is fixedly connected with the fixed plate (22), one end of the probe (23) is fixedly connected with the fixed plate (22), the mounting plate (24) is fixedly connected with the fixed plate (22) through a cylinder, and the driving wedge (25) is fixedly installed at the end of the mounting plate (24).

3. The detection device with intelligent positioning function for PCB according to claim 1, characterized in that: The positioning unit (4) includes a placement table (41), a sliding block (42), a positioning plate (43), a guide rod (44) and a connecting rod (45), the placement table (41) is fixedly installed in the case (1) through a cylinder, a rectangular groove is formed in the placement table (41), the guide rod (44) is arranged in the rectangular groove of the placement table (41), the sliding block (42) is slidingly installed on the guide rod (44), the positioning plate (43) is fixedly connected with the sliding block (42), the connecting rod (45) is fixedly connected with the sliding block (42), and a circuit board containing groove is arranged on the placement table (41).

4. The detection device with intelligent positioning function for PCB according to claim 3, characterized in that: The positioning unit (4) further includes a rotating plate (46), a rotating rod (47), a spiral spring (48), a moving wedge (49) and a sliding groove (410), the rotating plate (46) is fixedly connected with the connecting rod (45), the rotating plate (46) is fixedly connected with the rotating rod (47), the rotating rod (47) is rotatably installed on the case (1), one end of the spiral spring (48) is fixedly connected with the rotating rod (47), the other end of the spiral spring (48) is fixedly connected with the moving wedge (49), the moving wedge (49) is slidingly installed in the sliding groove (410), and the sliding groove (410) is fixedly installed on the case (1).

5. The detection device with intelligent positioning function for PCB according to claim 3, characterized in that: The retaining unit (5) includes a pressing plate (51), a push rod (52), a moving plate (53), a return spring (54), a guide pipe (55) and a vacuum box (56), the pressing plate (51) is fixedly connected with the push rod (52), the push rod (52) is slidingly connected with the vacuum box (56), the push rod (52) is fixedly connected with the moving plate (53), the moving plate (53) is slidingly installed in the vacuum box (56), one end of the guide pipe (55) is in communication connection with the vacuum box (56) above the moving plate (53), the other end of the guide pipe (55) is in communication connection with the air hole of the circuit board containing groove of the placement table (41), and the vacuum box (56) is provided with a one-way air inlet valve and a one-way air outlet valve.

6. The detection device with intelligent positioning function for PCB according to claim 4, characterized in that: In the vertical direction, the length of the moving wedge (49) near the horizontal ground is less than the length away from the horizontal ground.

7. The detection device with intelligent positioning function for PCB according to claim 3, characterized in that: The driving coil (35) away from the horizontal ground is a current input end. 8.The PCB detection device with intelligent positioning function according to claim 1, characterized in that: The case (1) is provided with a controller, and the outer surface of the case (1) is provided with a control console.

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