Fault detection and positioning device for pcb circuit board

Abstract

The invention discloses a fault detection and positioning device for a pcb circuit board, and relates to the field of circuit board fault detection and positioning, the fault detection and positioning device comprises an operation table and a supporting mechanism installed on the upper surface of the operation table and used for fixing the circuit board, and a positioning mechanism used for positioning a fault part is arranged below the operation table. The top of the operation table is fixedly provided with a bending guide rod and a detection mechanism slidably connected to the top of the bending guide rod. A hardboard used for synchronously corresponding to a circuit board is arranged, an electric push rod pushes out a movable rod, holes in specific shapes are punched in the hardboard, tool bits in different shapes correspond to different faults, the hardboard is used for determining the positions and types of the faults, and when a follow-up maintainer repairs the circuit board, the maintenance efficiency is greatly improved. The cardboard can be directly used as a reference basis to help maintenance personnel, so that the maintenance personnel do not need to repeatedly compare data and do not need to remember detection data.

Description

Technical Field

[0001] The invention relates to the technical field of circuit board fault detection and positioning, in particular to a PCB circuit board fault detection and positioning device. Background Art

[0002] Circuit board fault detection refers to the process of inspecting, testing and analyzing the circuit board through various technical means and methods to determine whether it has a fault and find out the specific location and cause of the fault.

[0003] For example, the patent "Device and method for locating faulty chips in high-density circuit boards" with publication number CN110888044A includes: a test bench, on which the circuit board with the faulty chip to be located is placed; a DC power supply, which supplies power to the chips on the same power network on the circuit board; a thermal imager, with the imaging direction facing the test bench, which performs thermal imaging on the circuit board after power is supplied to the test bench; an image analysis and positioning module, which is connected to the thermal imager, receives the thermal image generated by the thermal imager, and determines the position of the faulty chip on the circuit board based on the hot spots in the thermal image.

[0004] However, in the prior art, the existing fault detection device can only detect the fault type when detecting the circuit board, but cannot help the operator to mark the fault location. There are a large number of components on the circuit board, and the operator cannot quickly remember the fault location, resulting in the detection personnel needing to perform both detection and maintenance operations at the same time during the actual operation, which is not conducive to improving the efficiency of fault maintenance. In addition, this operation method also requires the maintenance personnel to remember the detection data to ensure that there will be no errors in the maintenance. If the detection data is not remembered, it is necessary to repeatedly check the detection data, which is time-consuming and laborious. Summary of the invention

[0005] The purpose of the present invention is to provide a PCB circuit board fault detection and positioning device to solve the problem proposed in the above background technology that the operator cannot quickly remember the fault location, resulting in the detection personnel needing to perform both detection and maintenance operations at the same time during the actual operation, which is not conducive to improving the efficiency of fault maintenance.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a PCB circuit board fault detection and positioning device, comprising an operating table, and also comprising a supporting mechanism installed on the upper surface of the operating table for fixing the circuit board, a positioning mechanism for locating the fault part is arranged below the operating table, and a bending guide rod and a detection mechanism slidably connected to the top of the operating table are fixedly installed on the top of the operating table; The detection mechanism includes a main control module, a signal source module, a data acquisition module, a probe module and a communication module, wherein the main control module is used for controlling and processing data of the detection mechanism, the signal source module is used for sending a test signal applied to the circuit board, the data acquisition module is used for converting the analog signal into a digital signal for processing by the main control module, the probe module is used for applying the test signal to the circuit board and collecting the response signal, and the communication module is used for data transmission and sending instructions to the positioning mechanism; The positioning mechanism includes a positioning frame, a mobile base movably arranged at the edge of the positioning frame and having universal wheels at the bottom, a containing cylinder installed on the side of the mobile base and symmetrically distributed along the upper and lower sides of the positioning frame, a turntable rotatably installed on the inner wall of the containing cylinder, and six or more movable rods movably installed inside the turntable, and a cutter head of different shapes is fixedly installed at the end of each movable rod, and each cutter head represents a fault type, and a through hole is opened at the intersection of the turntable and the movable rod; The signal source module applies the test signal to the circuit board through the probe module and collects the response signal. The data acquisition module processes the corresponding signal and transmits it to the main control module. The main control module compares the signal with the standard value and determines the fault type. After determining the fault type, the communication module sends a rotation instruction to the turntable in the positioning mechanism. The turntable rotates different movable rods to the exit of the cylinder to prepare for drilling and positioning.

[0007] Preferably, an extension rod facing the positioning frame is fixedly mounted on the side of the mobile base, and the accommodating cylinder is fixedly mounted on the end of the extension rod; A cardboard is inserted into the interior of the positioning frame, and two accommodating cylinders are coaxially and symmetrically distributed on the upper and lower sides of the cardboard; The bottom of the rotating disk is fixedly connected with a servo motor, the bottom of the servo motor is connected to the inner wall of the accommodating cylinder, and the end of each movable rod is fixedly installed with a cutter head of different shapes, and a through hole is opened at the intersection of the rotating disk and the movable rod; The positioning mechanism also includes an electric push rod fixedly built into the accommodating cylinder in a vertical state, and the electric push rod and the servo motor are both connected to the detection mechanism by signal; The electric push rod is located on the side of the servo motor, and one end of the telescopic rod of the electric push rod is overlapped on the bottom of the movable rod.

[0008] Preferably, a blocking block having a radius greater than the movable rod's own radius is fixedly mounted on the bottom of the movable rod, and a tension spring is fixedly mounted on the surface of the blocking block; A cavity with a shape matching that of the blocking block is provided inside the rotating disk, the blocking block is slidably overlapped on the inner wall of the cavity, and one end of the tension spring is fixedly connected to the inner wall of the cavity.

[0009] Preferably, an opening for the movable rod to enter and exit is provided at an eccentric position of the accommodating cylinder toward one end of the cardboard, and the axis of the opening coincides with the axis of the electric push rod.

[0010] Preferably, an electric cylinder is provided at the bottom of the four sides of the positioning frame, and a protrusion which is clamped at the edge of the positioning frame is fixedly installed at the end of the piston rod of the electric cylinder; The electric cylinder is located at the midpoint of the positioning frame body.

[0011] Preferably, a strip-shaped groove for accommodating cardboard is provided inside the positioning frame; A pressing block is inserted into the top of the positioning frame, and the pressing block is pressed on the edge of the cardboard. A receiving hole is provided at the intersection of the positioning frame and the pressing block, and the receiving hole is communicated with the strip groove.

[0012] Preferably, the support mechanism comprises a rotating shaft symmetrically mounted on the upper surface of the operating table, a rotating wheel fixedly mounted on the outer wall of the rotating shaft, and two supporting plates arranged in an up-and-down staggered and horizontal state; One end of the two support plates is fixedly connected with a transmission rod, and the two transmission rods are respectively located on both sides of the rotating wheel. A positioning block for limiting the position of the transmission rod and a bearing seat for limiting the position of the rotating shaft are fixedly installed on the upper surface of the operating table. The transmission rod is slidably connected to the inside of the positioning block, and the rotating shaft is rotatably installed inside the bearing seat.

[0013] Preferably, the support mechanism further comprises an AC motor fixedly mounted on the lower surface of the operating table, and the output shaft of the AC motor is fixedly connected to a belt transmission assembly; The belt transmission assembly is arranged in a triangle shape, and a pulley in the belt transmission assembly is fixedly connected to a rotating shaft.

[0014] Preferably, arc-shaped grooves are provided on both sides of the rotating wheel, the arc of the arc-shaped groove is the same as the arc of the rotating wheel, and the ends of the arc-shaped grooves are connected with arched grooves; A round block is fixedly installed on one side of the two transmission rod ends, and the round block is slidably connected inside the arc groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a cardboard is provided for synchronously corresponding to the circuit board. In the process of fault detection, the circuit board is on the supporting mechanism and scanned by the detection mechanism. The servo motor and the electric push rod are controlled according to the scanning result. The electric push rod pushes out the movable rod to punch a hole of a specific shape on the cardboard. Different shapes of cutter heads correspond to different faults. The cardboard is used as a display carrier for determining the location and type of the fault. When subsequent maintenance personnel repair the circuit board, the cardboard can be directly used as a reference to help the maintenance personnel, so that the maintenance personnel do not need to repeatedly compare data and do not need to remember the detection data. They only need to refer to the marks on the cardboard for maintenance, which greatly improves the efficiency of maintenance. In addition, no high-precision instruments are used as a whole, which is suitable for large-scale use.

[0016] 2. In the present invention, the movable rod for punching holes on the cardboard is built into the turntable. When it is actually used, the turntable is driven by the servo motor to rotate, and different movable rods are moved above the electric push rod to achieve the purpose of individual marking. At the same time, the accommodating cylinders are symmetrically distributed on the upper and lower sides of the cardboard to ensure the quality of the punching. At the same time, the accommodating cylinder is driven by a movable base and can be moved to any position. During the movement, the piston rod in the electric cylinder can be controlled to be retracted, which will not affect the movement of the accommodating cylinder, and only one piston rod is retracted each time, which will not affect the stability of the positioning frame.

[0017] 3. In the present invention, the detection mechanism uses a probe module to perform fault detection. When in use, the probe contacts the circuit board and sends out a test signal. The response signal is compared with a preset standard value to determine whether a fault occurs. The frequency and amplitude of the test signal can be controlled, which expands the detection range. The number of tests can be increased by adjusting the frequency and amplitude, thereby improving the data accuracy of the test results and avoiding false detection. During the test, a signal is also sent in real time to control the positioning mechanism to ensure the synchronization of the overall coordinated operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a PCB circuit board fault detection and positioning device of the present invention; Figure 2 A front view of a PCB circuit board fault detection and positioning device according to the present invention; Figure 3 A schematic diagram of a detection mechanism module of a PCB circuit board fault detection and positioning device of the present invention; Figure 4 A side view of a PCB circuit board fault detection and positioning device according to the present invention; Figure 5 A top view of a support mechanism of a PCB circuit board fault detection and positioning device according to the present invention; Figure 6 It is a three-dimensional structural schematic diagram of a rotating shaft, a rotating wheel and a belt transmission assembly of a PCB circuit board fault detection and positioning device of the present invention; Figure 7 A schematic diagram of the position and structure of a support plate and a rotating wheel of a PCB circuit board fault detection and positioning device of the present invention; Figure 8 It is a three-dimensional structural schematic diagram of a positioning mechanism of a PCB circuit board fault detection and positioning device of the present invention; Fig. 9 It is a schematic diagram of the disassembly of the positioning frame and the movable base structure of a PCB circuit board fault detection and positioning device of the present invention; Fig.10 A schematic diagram of the internal structure of a containing cylinder of a PCB circuit board fault detection and positioning device according to the present invention; Fig.11 The present invention is a schematic diagram of the internal structure of a turntable of a PCB circuit board fault detection and positioning device.

[0019] In the figure: 1. operating table; 2. supporting mechanism; 3. positioning mechanism; 4. bending guide rod; 5. detecting mechanism; 6. bearing seat; 7. positioning block; 21. rotating shaft; 22. rotating wheel; 23. supporting plate; 24. AC motor; 25. belt transmission assembly; 26. transmission rod; 27. arc groove; 28. arched groove; 29. ​​round block; 31. electric cylinder; 32. positioning frame; 33. movable base; 34. cardboard; 35. Bump; 36, pressing block; 37, accommodating cylinder; 38, opening; 39, strip groove; 310, accommodating hole; 311, servo motor; 312, electric push rod; 313, turntable; 314, through hole; 315, cavity; 316, movable rod; 317, blocking block; 318, tension spring; 51, main control module; 52, signal source module; 53, data acquisition module; 54, probe module; 55, communication module. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Reference Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown: A PCB circuit board fault detection and positioning device, comprising an operating table 1, and also comprising a supporting mechanism 2 installed on the upper surface of the operating table 1 for fixing the circuit board, a positioning mechanism 3 for locating the fault part is arranged below the operating table 1, and a bending guide rod 4 and a detection mechanism 5 slidably connected to the top of the operating table 1 are fixedly installed on the top of the operating table 1; The detection mechanism 5 includes a main control module 51, a signal source module 52, a data acquisition module 53, a probe module 54 and a communication module 55. The main control module 51 is used for system control and data processing. A microcontroller is used as a control unit to compare the collected signal with a preset standard value to determine whether the circuit board has a fault. The signal source module 52 is used to send a test signal to the circuit board, and uses a function generator to generate signals of different frequencies and amplitudes. The probe module 54 is used to contact the test point on the circuit board through the probe, apply the test signal to the circuit board, and collect the response signal. The data acquisition module 53 is used to convert the response signal in the form of an analog signal into a digital signal for processing by the main control module 51; the communication module 55 is used for data transmission and sends instructions to the positioning mechanism 3; The positioning mechanism 3 includes a positioning frame 32, a movable base 33 movably arranged at the edge of the positioning frame 32 and provided with a universal wheel at the bottom, a accommodating cylinder 37 installed on the side of the movable base 33 and symmetrically distributed up and down along the center line of the positioning frame 32, a turntable 313 rotatably installed on the inner wall of the accommodating cylinder 37, and six or more movable rods 316 movably installed inside the turntable 313, and each movable rod 316 has a cutter head of different shapes fixedly installed at the end portion, each cutter head represents a fault type, and a through hole 314 is opened at the intersection of the turntable 313 and the movable rod 316.

[0022] In this embodiment, the signal source module 52 applies the test signal to the circuit board through the probe module 54 and collects the response signal. The data acquisition module 53 processes the response signal and transmits it to the main control module 51. The main control module 51 compares the signal with the standard value and determines the fault type. After determining the fault type, it sends a rotation instruction to the turntable 313 in the positioning mechanism 3 through the communication module 55. The turntable 313 rotates different movable rods 316 to the exit of the accommodating cylinder 37 for drilling and positioning.

[0023] In this embodiment, an extension rod facing the positioning frame 32 is fixedly installed on the side of the mobile base 33, and the accommodating cylinder 37 is fixedly installed on the end of the extension rod; A cardboard 34 is inserted into the interior of the positioning frame 32, and two receiving cylinders 37 are coaxially and symmetrically distributed on the upper and lower sides of the cardboard 34; The bottom of the turntable 313 is fixedly connected with a servo motor 311, and the bottom of the servo motor 311 is connected to the inner wall of the accommodating cylinder 37; The positioning mechanism 3 further includes an electric push rod 312 fixedly built inside the accommodating cylinder 37 in a vertical state. Both the electric push rod 312 and the servo motor 311 are signal-connected to the detection mechanism 5; The electric push rod 312 is located on the side of the servo motor 311, and one end of the telescopic rod of the electric push rod 312 abuts against the bottom of the movable rod 316.

[0024] In this embodiment, the operating table 1 is used to determine the positions of the support mechanism 2 and the positioning mechanism 3. The support mechanism 2 is above the operating table 1 and is used to determine the position of the circuit board, while the positioning mechanism 3 is directly below the support mechanism 2 and is used to accurately locate the fault position. When in use, the circuit board is placed on the positioning mechanism 3, and then the detection mechanism 5 moves along the direction of the bending guide rod 4. When a fault is detected, a signal is sent to control the positioning mechanism 3, and the positioning mechanism 3 and the detection mechanism 5 remain in a synchronous moving state. Different fault types correspond to different signals.

[0025] The probe module 54 contacts the test points on the circuit board. Then, the signal source module 52 applies a test signal to the circuit board and simultaneously receives the response signal fed back by the circuit board. The response signal is processed by the data acquisition module 53 and converted into a digital signal for transmission to the main control module 51. The main control module 51 compares the signal with a preset standard value to determine whether there is a fault in the circuit board. During the process of the detection mechanism 5 moving and detecting the circuit board, the communication module 55 continuously sends instructions to the positioning mechanism 3.

[0026] The positioning instructions sent by the communication module 55 are received by the servo motor 311, and the moving instructions are received by the moving base 33. The moving base 33 is used to drive the accommodating cylinder 37 to ensure that the accommodating cylinder 37 is always at the detected position of the circuit board. The servo motor 311 is used to drive the turntable 313 to turn the movable rod 316 corresponding to the fault type to the through hole 314. Different-shaped cutter heads at the end of the movable rod 316 correspond to different fault types. The movable rod 316 is built inside the through hole 314 of the turntable 313. After the turntable 313 adjusts the position of the movable rod 316, the movable rods 316 in the two accommodating cylinders 37 move towards the cardboard 34 at the same time and finally contact the cardboard 34, thereby punching a specific-shaped marking hole in the cardboard 34. The position of the marking hole is directly below the scanning position.

[0027] The cardboard 34 is installed in the positioning frame 32 and can be taken out from the positioning frame 32. During the movement of the detection mechanism 5, the moving base 33 also moves synchronously to ensure that the accommodating cylinder 37 moves to the fault location and thus remains synchronous with the detection mechanism 5.

[0028] After the circuit board is inspected, the cardboard 34 is taken out of the positioning frame 32. When the circuit board is actually repaired, the position of the marking hole on the cardboard 34 represents the fault position, and the shape of the marking hole represents different fault types. When using the cardboard 34, it can be covered on the circuit board, so that the maintenance personnel do not need to repeatedly compare data during operation, and do not need to remember the inspection data. They only need to refer to the marks on the cardboard 34 for maintenance, which greatly improves the efficiency of maintenance. In addition, no high-precision instruments are used as a whole, which not only reduces the cost of use, but also is suitable for large-scale use.

[0029] Embodiment 2: According to Fig. 9 and Fig.10 As shown, the positioning mechanism 3 also includes an electric push rod 312 fixedly built into the accommodating cylinder 37 in a vertical state, and the electric push rod 312 and the servo motor 311 are both connected to the detection mechanism 5 by signal; The electric push rod 312 is located on the side of the servo motor 311, and one end of the telescopic rod of the electric push rod 312 is overlapped at the bottom of the movable rod 316; A blocking block 317 having a radius larger than the active rod 316 is fixedly mounted at the bottom of the active rod 316, and a tension spring 318 for pulling the active rod 316 is fixedly mounted on the surface of the blocking block 317; The rotating disk 313 has a cavity 315 whose shape matches that of the blocking block 317. The blocking block 317 is slidably overlapped on the inner wall of the cavity 315. One end of the tension spring 318 is fixedly connected to the inner wall of the cavity 315. An opening 38 for the movable rod 316 to enter and exit is formed at an eccentric position of the accommodating cylinder 37 facing one end of the cardboard 34 , and the axis of the opening 38 coincides with the axis of the electric push rod 312 .

[0030] In this embodiment, the electric push rod 312 is installed in a vertical state inside the accommodating cylinder 37 and is on the same axis as the opening 38. It is located between the turntable 313 and the accommodating cylinder 37 to avoid affecting the rotation of the turntable 313. The power supply line is set in the remaining space in the accommodating cylinder 37. After the turntable 313 drives the movable rod 316 to rotate above the electric push rod 312 and stops, the electric push rod 312 pushes the movable rod 316 out of the turntable 313, and the movable rod 316 passes through the opening 38 and contacts the cardboard 34, punching a marking hole of a specific shape on the cardboard 34.

[0031] The movable rod 316 contacts the electric push rod 312 through the blocking block 317. The blocking block 317 is located inside the cavity 315. The diameter of the cavity 315 is larger than the diameter of the opening 38. When the electric push rod 312 pushes the movable rod 316, it can prevent it from detaching from the turntable 313.

[0032] One end of the tension spring 318 is connected to the blocking block 317, and the other end is connected to the inner wall of the cavity 315, and the whole is sleeved on the outer wall of the movable rod 316. In the normal state, the tension spring 318 will push the movable rod 316 to the inside of the turntable 313 through the blocking block 317, preventing the cutter head from staying in the opening 38 of the accommodating cylinder 37, thereby ensuring that the turntable 313 can rotate normally. When the electric push rod 312 pushes the movable rod 316, the tension spring 318 will be compressed and will not affect the normal movement of the movable rod 316.

[0033] Embodiment 3: According to Figure 7 and Figure 8 As shown, an electric cylinder 31 is arranged at the bottom of the surrounding of the positioning frame 32, and a protrusion 35 which is fixedly mounted on the end of the piston rod of the electric cylinder 31 and is clamped at the edge of the positioning frame 32; The electric cylinder 31 is located at the midpoint of the positioning frame 32; The interior of the positioning frame 32 is provided with a strip-shaped groove 39 for accommodating the cardboard 34; A pressing block 36 is inserted into the top of the positioning frame 32 , and the pressing block 36 is pressed on the edge of the cardboard 34 . A receiving hole 310 is opened at the intersection of the positioning frame 32 and the pressing block 36 , and the receiving hole 310 is connected to the strip groove 39 .

[0034] In this embodiment, there are four electric cylinders 31, which are respectively located at the midpoints of the four sides of the positioning frame 32, and are used to fix the positioning frame 32 so as to determine the position of the cardboard 34. When the detection mechanism 5 scans the circuit board, the mobile base 33 moves synchronously with the detection mechanism 5. During the movement of the mobile base 33, the electric cylinders 31 on the moving route can retract the piston rod to avoid affecting the mobile base 33. After the piston rod of one of the electric cylinders 31 is retracted, there are still three electric cylinders 31 supporting the positioning frame 32, which can ensure the stability of the positioning frame 32, and the protrusion 35 set at the end of the piston rod can determine the position of the positioning frame 32 to prevent the positioning frame 32 from shaking. The electric cylinder 31 is located at the midpoint of the positioning frame 32 to avoid the imbalance of the positioning frame 32. The positioning frame 32 is provided with a strip groove 39 to accommodate the cardboard 34. The edge of the cardboard 34 stays in the positioning frame 32 to ensure its stability. When replacing the cardboard 34, the cardboard 34 with holes is taken out from the strip groove 39 and the new cardboard 34 is inserted. The pressing block 36 inserted into the accommodating hole 310 can press the contact portion of the cardboard 34 and the strip groove 39 to ensure the stability of the cardboard 34. The pressing block 36 is made of metal material and has a large mass, which can press the cardboard 34. The movable rods 316 are symmetrically distributed up and down, which can ensure that the force on the cardboard 34 is in a balanced state when punching, thereby not destroying the stability of the cardboard 34.

[0035] Embodiment 4: According to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the support mechanism 2 includes a rotating shaft 21 symmetrically mounted on the upper surface of the operating table 1, a rotating wheel 22 fixedly mounted on the outer wall of the rotating shaft 21, and two supporting plates 23 arranged in an up-and-down staggered and horizontal state; One end of each of the two support plates 23 is fixedly connected with a transmission rod 26, and the two transmission rods 26 are respectively located on both sides of the rotating wheel 22. A positioning block 7 for defining the position of the transmission rod 26 and a bearing seat 6 for defining the position of the rotating shaft 21 are fixedly installed on the upper surface of the operating table 1. The transmission rod 26 is slidably connected inside the positioning block 7, and the rotating shaft 21 is rotatably installed inside the bearing seat 6. The support mechanism 2 further includes an AC motor 24 fixedly mounted on the lower surface of the operating table 1, and the output shaft of the AC motor 24 is fixedly connected to a belt transmission assembly 25; The cross section of the belt transmission assembly 25 is triangular, and the pulley in the belt transmission assembly 25 is fixedly connected to the rotating shaft 21; Arc grooves 27 are formed on both sides of the rotating wheel 22. The arc of the arc groove 27 is the same as the arc of the rotating wheel 22, and the ends of the arc grooves 27 are connected to arched grooves 28. A round block 29 is fixedly mounted on one side of the ends of the two transmission rods 26 , and the round block 29 is slidably connected inside the arc groove 27 .

[0036] In this embodiment, a positioning block 7 is provided on the operating table 1 to determine the position of the transmission rod 26, and a bearing seat 6 is provided to determine the position of the rotating shaft 21. The transmission rod 26 is perpendicular to the rotating shaft 21. The AC motor 24 is installed on the lower surface of the operating table 1 and is connected to the two rotating shafts 21 at the same time through the belt transmission assembly 25.

[0037] When the supporting mechanism 2 is used to support the circuit board, the circuit board is overlapped on the upper surface of the lower supporting plate 23, and vertical baffles are provided at the four corners of the operating table 1 to determine the position of the circuit board.

[0038] When a circuit board is inspected, the AC motor 24 drives the two shafts 21 to rotate simultaneously through the belt transmission assembly 25. During the rotation of the shaft 21, the wheel 22 on the outer wall thereof pushes the round block 29 through the arc groove 27 and the arch groove 28.

[0039] The round block 29 is installed at the end of the transmission rod 26. Since the curvature of the arc groove 27 and the arch groove 28 are different, during the rotation of the rotating wheel 22, the round block 29 at the end of the transmission rod 26 at the bottom will enter the arch groove 28 from the arc groove 27. Due to the change in radius, the horizontal position of the round block 29 will be forced to change, thereby causing the transmission rod 26 to produce a displacement, thereby achieving the purpose of moving the lower support plate 23 away from the bottom of the circuit board. During this process, the round block 29 at the end of the upper transmission rod 26 will enter the arc groove 27 from the arch groove 28, and the upper support plate 23 will cover the upper surface of the circuit board, so that the circuit board will fall directly onto the positioning frame 32. At this time, the operator can take out the circuit board. After the rotating wheel 22 rotates one circle, the two support plates 23 will move back to the initial state, and a new circuit board can be placed at this time.

[0040] The use method and working principle of the device: When in use, the circuit board is placed on the upper surface of the lower support plate 23, and the detection mechanism 5 moves along the direction of the bent guide rod 4. When a fault is detected, the detection mechanism 5 sends a signal to the servo motor 311, and the servo motor 311 drives the turntable 313 to turn different movable rods 316 to the opening 38, and then the electric push rod 312 pushes the movable rod 316 out of the turntable 313 to punch a marking hole on the cardboard 34. Different faults correspond to different signals, and the turntable 313 can turn different types of movable rods 316 to the opening 38; During the detection process, the mobile base 33 will move synchronously with the detection mechanism 5, and the electric cylinder 31 on the moving route can retract the piston rod to avoid affecting the mobile base 33. After the detection mechanism 5 has finished the detection, the AC motor 24 drives the two shafts 21 to rotate simultaneously through the belt transmission assembly 25. During the rotation of the shaft 21, the wheel 22 on its outer wall will push the round block 29 through the arc groove 27 and the arch groove 28. Since the arc groove 27 and the arch groove 28 have different curvatures, the transmission rod 26 is forced to move a certain distance, so that the lower support plate 23 moves away from the bottom of the circuit board, and the upper support plate 23 covers the upper surface of the circuit board, so that the circuit board falls directly onto the positioning frame 32. At this time, the operator can take out the circuit board and place a new one. Finally, remove the pressing block 36 on the positioning frame 32 and take out the cardboard 34 in the positioning frame 32. When repairing the circuit board, cover the cardboard 34 on the circuit board, and the marking holes at specific positions on the cardboard can be used as a reference to help maintenance personnel.

[0041] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PCB circuit board fault detection and positioning device, comprising an operating table (1), characterized in that: It also includes a support mechanism (2) mounted on the upper surface of the operating table (1) for fixing the circuit board, a positioning mechanism (3) for locating the fault location is arranged below the operating table (1), and a bent guide rod (4) and a detection mechanism (5) slidably connected to the top of the operating table (1) are fixedly mounted on the top of the operating table (1); The detection mechanism (5) comprises a main control module (51), a signal source module (52), a data acquisition module (53), a probe module (54) and a communication module (55), wherein the main control module (51) is used for controlling the detection mechanism (5) and processing data, the signal source module (52) is used for issuing a test signal to be applied to the circuit board, the probe module (54) is used for applying the test signal to the circuit board and collecting a response signal, the data acquisition module (53) is used for converting the response signal in the form of an analog signal into a digital signal for processing by the main control module (51), and the communication module (55) is used for data transmission and issuing instructions to the positioning mechanism (3); The positioning mechanism (3) comprises a positioning frame (32), a movable base (33) movably arranged at the edge of the positioning frame (32) and having universal wheels at the bottom, a containing cylinder (37) mounted on the side of the movable base (33) and symmetrically distributed along the upper and lower sides of the positioning frame (32), a turntable (313) rotatably mounted on the inner wall of the containing cylinder (37), and six or more movable rods (316) movably mounted inside the turntable (313), and a cutter head of different shapes is fixedly mounted on the end portion of each movable rod (316), each cutter head representing a fault type, and a through hole (314) is provided at the intersection of the turntable (313) and the movable rod (316); The signal source module (52) applies a test signal to the circuit board through the probe module (54) and collects a response signal. The data collection module (53) processes the response signal and transmits it to the main control module (51). The main control module (51) compares the signal with a standard value and determines the fault type. After determining the fault type, the communication module (55) sends a rotation instruction to the turntable (313) in the positioning mechanism (3). The turntable (313) rotates different movable rods (316) to the exit of the accommodating cylinder (37) to punch holes for positioning.

2. A PCB circuit board fault detection and positioning device according to claim 1, characterized in that: An extension rod facing the positioning frame (32) is fixedly mounted on the side of the movable base (33), and the accommodating cylinder (37) is fixedly mounted on the end of the extension rod; A cardboard (34) is inserted into the interior of the positioning frame (32), and two accommodating cylinders (37) are coaxially and symmetrically distributed on the upper and lower sides of the cardboard (34); A servo motor (311) is fixedly connected to the bottom of the rotating disk (313), and the bottom of the servo motor (311) is connected to the inner wall of the accommodating cylinder (37); The positioning mechanism (3) further comprises an electric push rod (312) fixedly built into the containing cylinder (37) in a vertical state, wherein the electric push rod (312) and the servo motor (311) are both signal-connected to the detection mechanism (5); The electric push rod (312) is located on the side of the servo motor (311), and one end of the telescopic rod of the electric push rod (312) abuts against the bottom of the movable rod (316).

3. A PCB circuit board fault detection and positioning device according to claim 1, characterized in that: A blocking block (317) having a radius greater than the movable rod (316) is fixedly mounted on the bottom of the movable rod (316), and a tension spring (318) is fixedly mounted on the surface of the blocking block (317); The rotating disk (313) is provided with a cavity (315) whose shape matches that of the blocking block (317). The blocking block (317) is slidably overlapped on the inner wall of the cavity (315), and one end of the tension spring (318) is fixedly connected to the inner wall of the cavity (315).

4. A PCB circuit board fault detection and positioning device according to claim 1, characterized in that: An opening (38) for the movable rod (316) to enter and exit is provided at an eccentric position of the accommodating cylinder (37) at one end facing the cardboard (34), and the axis of the opening (38) coincides with the axis of the electric push rod (312).

5. A PCB circuit board fault detection and positioning device according to claim 1, characterized in that: An electric cylinder (31) is arranged at the bottom of the four sides of the positioning frame (32), and a protrusion (35) which is fixedly mounted on the end of the piston rod of the electric cylinder (31) and is clamped at the edge of the positioning frame (32); The electric cylinder (31) is located at the midpoint of the positioning frame (32).

6. A PCB circuit board fault detection and positioning device according to claim 1, characterized in that: The interior of the positioning frame (32) is provided with a strip-shaped groove (39) for accommodating the cardboard (34); A pressing block (36) is inserted into the top of the positioning frame (32), and the pressing block (36) is pressed on the edge of the cardboard (34). A receiving hole (310) is provided at the junction of the positioning frame (32) and the pressing block (36), and the receiving hole (310) is connected to the strip groove (39).

7. A PCB circuit board fault detection and positioning device according to claim 1, characterized in that: The support mechanism (2) comprises a rotating shaft (21) symmetrically mounted on the upper surface of the operating table (1), a rotating wheel (22) fixedly mounted on the outer wall of the rotating shaft (21), and two supporting plates (23) arranged in an up-and-down staggered and horizontal state; One end of each of the two support plates (23) is fixedly connected to a transmission rod (26), and the two transmission rods (26) are respectively located on both sides of the rotating wheel (22). A positioning block (7) for defining the position of the transmission rod (26) and a bearing seat (6) for defining the position of the fixed rotating shaft (21) are fixedly mounted on the upper surface of the operating table (1). The transmission rod (26) is slidably connected to the inside of the positioning block (7), and the rotating shaft (21) is rotatably mounted inside the bearing seat (6).

8. A PCB circuit board fault detection and positioning device according to claim 7, characterized in that: The support mechanism (2) further comprises an AC motor (24) fixedly mounted on the lower surface of the operating table (1), wherein an output shaft of the AC motor (24) is fixedly connected to a belt transmission assembly (25); The belt transmission assembly (25) is arranged in a triangular shape, and the pulley in the belt transmission assembly (25) is fixedly connected to the rotating shaft (21).

9. A PCB circuit board fault detection and positioning device according to claim 7, characterized in that: Arc grooves (27) are provided on both sides of the rotating wheel (22), the arc of the arc groove (27) is the same as the arc of the rotating wheel (22), and the ends of the arc grooves (27) are connected to arched grooves (28); round blocks (29) are fixedly mounted on one side of the ends of the two transmission rods (26), and the round blocks (29) are slidably connected to the inside of the arc grooves (27).

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