Flying probe machine with accurate positioning function for dust-free PCB

Abstract

The application discloses a flying probe machine with accurate positioning function and dust-free type for PCB, relates to the technical field of PCB detection, and comprises a machine body, a fixing mechanism, a top seat, a workbench and a detection mechanism. The top seat and the workbench are arranged at the upper and lower ends of the machine body respectively. Compared with the flying probe machine for the current PCB detection, the flying probe machine is provided with a feeding assembly and a guide assembly. Different sizes of PCBs are transported into the fixing mechanism through the cooperation of the feeding assembly and the guide assembly, so that the PCBs integrated with high-end chips can be accurately moved to the middle position of the fixing mechanism, and a solid foundation is provided for the accuracy of subsequent probe testing. In addition, the feeding assembly and the guide assembly in the application can directly transport new PCBs into the fixing mechanism after the detection of the PCBs is completed, thereby avoiding the trouble that the traditional flying probe machine for PCB detection needs to take out the previously detected PCB and then place the new PCB to be detected into the fixing mechanism.

Description

Technical Field

[0001] This invention relates to the field of PCB inspection technology, specifically a dust-free flying probe machine for PCBs with precise positioning function. Background Technology

[0002] In the context of the rapid development of modern electronic information technology, printed circuit boards (PCBs) are an indispensable key component in electronic products, undertaking the important function of connecting and supporting various electronic components. Whether in consumer electronics, industrial control, or power distribution systems of new energy equipment, PCBs play a core role. Especially in precision electronic equipment equipped with high-end chips, the quality of PCBs directly determines the performance and reliability of electronic products. Probe testing, as the core means of detecting PCB performance, is closely related to the final quality control of PCBs. In the PCB manufacturing process, flying probe machines, as high-precision PCB inspection equipment, are widely used in electronics manufacturing enterprises due to their high reliability in probe testing, especially suitable for complex PCB inspection scenarios integrating high-end chips. However, existing flying probe machines for PCB inspection typically use manual or semi-automatic loading and unloading methods. In actual production, after completing the inspection of a PCB, the operator needs to manually remove the inspected PCB from the fixing mechanism and then place the new PCB to be inspected into the fixing mechanism. This operation process not only consumes a lot of time and labor costs, but also, due to the limitations of manual operation, it is difficult to guarantee the positional accuracy of each PCB placement. For critical PCBs in the power distribution system of new energy equipment and high-end chip matching PCBs with extremely high precision requirements, such errors may lead to deviations in the inspection results. Finally, during the inspection process, operational errors and program errors may sometimes occur. Existing flying probe machines for PCB inspection lack effective self-protection mechanisms, and probe damage often occurs. This not only affects the continuity of probe testing, but may also fail to meet the inspection requirements of high-end chip PCBs due to the decrease in probe accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a dust-free flying probe machine for PCBs with precise positioning function to solve the problems mentioned in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dust-free PCB flying probe machine with precise positioning function. The flying probe machine includes a body, a fixing mechanism, a top base, a worktable, and a detection mechanism. The top base and the worktable are respectively located at the upper and lower ends of the body. The fixing mechanism is located between the top base and the worktable and is connected to the worktable via a first lifting module. The detection mechanism is located at the side of the fixing mechanism and is connected to the worktable via a second lifting module and a first horizontal moving module. The worktable is internally equipped with a feeding component and a guiding component. The feeding component is connected to the worktable via a second horizontal moving module. During operation, the present invention transports PCB boards of different sizes into the fixing mechanism through the cooperation of the feeding component and the guiding component. The fixing mechanism fixes the PCB boards. After the PCB boards are fixed, the second lifting module and the first horizontal moving module control the detection mechanism to perform lifting and horizontal linear movements to ensure that the detection mechanism can detect each area of ​​the PCB board.

[0005] Furthermore, the feeding assembly includes a movable seat and a feeding base. The movable seat is connected to the worktable via a second horizontal moving module. The feeding base is movably mounted on the movable seat via a screw assembly, which controls the lifting and lowering movement of the feeding base. The feeding base is provided with a first feeding slot and a second feeding slot. The guiding assembly includes two fixed plates, two first guide rails, and two second guide rails. The two fixed plates are positioned opposite each other on both sides of the feeding base. The two first guide rails are positioned opposite each other on both sides of the first feeding slot, and the two second guide rails are positioned opposite each other on both sides of the second feeding slot. Each first guide rail is connected to a fixed plate via a first telescopic cylinder, and each second guide rail is connected to a fixed plate via a second telescopic cylinder. The cylinder is connected to the fixed plate. In the initial stage of operation, the operator can place the PCB board to be tested into the first loading slot. Then, the first telescopic cylinder drives the two first guide rails to move closer to each other, thereby limiting the PCB board to be tested. Next, the second horizontal moving module moves the movable seat and the loading seat to the bottom of the fixed mechanism. Finally, the lead screw assembly drives the loading seat and the PCB board to be tested to rise, so as to transport the PCB board to be tested into the fixed mechanism. During the transportation process, the position of the PCB board to be tested is restricted by the two first guide rails to ensure that the PCB board to be tested moves to the middle position of the fixed mechanism.

[0006] Furthermore, a vacuum suction cup is installed in both the first and second loading troughs. One vacuum suction cup is connected to the first loading trough via a first translation cylinder, and the other vacuum suction cup is connected to the second loading trough via a second translation cylinder. A limit plate is installed inside the first guide rail, and the limit plate is connected to the first guide rail via adjusting bolts. The structure and internal configuration of the second guide rail are the same as those of the first guide rail. When the operator places the PCB board to be inspected into the first loading trough and the two first guide rails contact the side of the PCB board to be inspected, the operator... The first translation cylinder on the side of the first loading trough can be opened, and the adjusting bolt can be turned to move the vacuum suction cup in the first loading trough and the limiting plate in the first guide rail. The vacuum suction cup in the first loading trough and the limiting plate in the first guide rail can limit the PCB board to be tested of different thicknesses, ensuring that the position of the PCB board to be tested does not shift during the process of rising into the fixing mechanism. At the same time, the vacuum suction cup and the limiting plate in this invention do not need to apply a large force when limiting the PCB board to be tested, preventing damage to the side wall of the PCB board to be tested due to excessive clamping force.

[0007] Furthermore, the fixing mechanism includes an upper clamp and a lower clamp. The upper clamp is connected to the first lifting module, and the lower clamp is set on the worktable. The upper clamp includes a first fixed seat and a first limiting seat. The first limiting seat is movably installed in the first fixed seat by a first translation motor. The lower end of the first limiting seat is provided with a first fixing groove and a second fixing groove. A first limiting component is provided in both the first fixing groove and the second fixing groove. The distance between the upper clamp and the lower clamp is controlled by the first lifting module, and the PCB board to be tested is limited and fixed by the first limiting component.

[0008] Furthermore, the lower clamp includes a second fixed seat and a second limiting seat. The second limiting seat is movably mounted in the second fixed seat via a second translation motor. The second limiting seat is provided with a third fixing groove and a fourth fixing groove. A second limiting component is provided in both the third and fourth fixing grooves. The first fixing groove is aligned with the third fixing groove, and the second fixing groove is aligned with the fourth fixing groove. In this invention, during the upward movement of the PCB board to be tested in the first loading groove, the PCB board to be tested will pass through the fourth fixing groove and the second fixing groove. The second limiting component in the fourth fixing groove and the first limiting component in the second fixing groove limit and fix the PCB board to be tested. Once the PCB board to be inspected is fixed in the second and fourth fixing slots, the operator can use the lead screw assembly to lower the loading seat to its initial position. Then, the next PCB board to be inspected is placed in the second loading slot. The vacuum suction cup in the second loading slot and the limiting plate in the second guide rail limit the PCB board to be inspected in the second loading slot. After the PCB boards in the second and fourth fixing slots have been inspected, the operator can use the lead screw assembly to raise the loading seat and the PCB boards to be inspected in the second loading slots. At this time, the PCB board to be inspected in the second loading slot will pass through the third and first fixing slots, and then... The second limiting component in the fixed slot and the first limiting component in the first fixed slot can fix the PCB board to be tested in the second loading slot into the fixing mechanism. Then, the operator can close the second limiting component in the fourth fixed slot and the first limiting component in the second fixed slot, and then turn on the vacuum suction cup in the first loading slot. The vacuum suction cup in the first loading slot can hold the PCB board that has been tested. At this time, the operator can use the lead screw assembly to move the loading seat and the PCB board that has been tested in the first loading slot downward. After the operator removes the PCB board that has been tested in the first loading slot, the first translation motor and the second translation motor are turned on. The first and second translation motors cause the first and second limiting seats to move synchronously until the distance between the PCB board to be tested in the third and first fixed slots and the testing mechanism is the rated distance. Compared with the current flying probe machine for PCB testing, this invention can directly move the new PCB board to be tested into the fixed mechanism when the previous PCB board has been tested but not yet removed. This avoids the trouble of first removing the previous PCB board that has been tested and then placing the new PCB board to be tested into the fixed mechanism. Through the above technical solution, this invention effectively improves work efficiency and reduces the trouble of secondary positioning calibration.

[0009] Furthermore, the first limiting component includes a first adjusting cylinder and a first limiting block. The first limiting block is disposed at the working end of the first adjusting cylinder. A first piezoelectric plate is disposed on the wall surface of the first limiting block away from the first adjusting cylinder. A first sensing block is disposed inside the end of the first limiting block away from the first adjusting cylinder. The first sensing block and the first limiting block are connected by a sensing spring. The structure of the second limiting component is the same as that of the first limiting component. When the first limiting component in this invention is not working, the first sensing block extends out of the first limiting block. When the PCB board to be detected moves into the first fixing slot or the second fixing slot, the first adjusting cylinder can drive the first limiting block to move. At this time, the first sensing block inside the first limiting block... The first limiting block will contact the PCB board to be tested first. When the first limiting block continues to move, the first piezoelectric piece on the first limiting block will contact the PCB board to be tested and generate a set of electrical signals. The operator can use this set of electrical signals to determine whether the first limiting block is in contact with the PCB board to be tested, so as to facilitate timely closure of the first adjusting cylinder and prevent damage to the side of the PCB board to be tested due to excessive clamping force. Finally, when the PCB board to be tested is fixed in the first or second fixing groove, it is subject to the clamping force of the first limiting block and the elastic force of the sensing spring. Through the above technical solution, the phenomenon that the PCB board to be tested will detach from the fixing mechanism due to insufficient clamping force when the first adjusting cylinder fails is effectively avoided.

[0010] Furthermore, two sets of second lifting modules are provided. The two sets of second lifting modules are movably mounted on the worktable via the first horizontal moving module. Each set of second lifting modules is equipped with a detection mechanism, which includes a mounting base and a detection probe. The mounting base is located at the working end of the second lifting module, and the detection probe is located at the end of the mounting base near the fixing mechanism. The lifting and horizontal movement of the two sets of detection mechanisms are controlled by the two sets of second lifting modules and the first horizontal moving module, thereby ensuring that the PCB board can be inspected from all angles.

[0011] Furthermore, the detection probe includes a probe, a connecting seat, and a fixed shaft. The connecting seat has a telescopic groove. The probe is located at the end of the connecting seat away from the mounting seat. One end of the fixed shaft is connected to the mounting seat, and the other end of the fixed shaft is wound with a spring and extends into the telescopic groove. If the probe collidees with the mounting seat due to operator error, the probe will be subjected to a large force. At this time, the probe will compress the spring on the fixed shaft, thereby causing the probe to move backward. Through the above technical solution, the present invention effectively avoids the phenomenon of probe damage caused by collision.

[0012] Furthermore, a positioning groove is provided inside the connector near the probe. A set of cavities is arranged at the upper and lower ends of the positioning groove, and each cavity contains a positioning block and an electromagnet. The end of each positioning block near the positioning groove is arc-shaped and extends into the groove. The end of the fixed shaft extending into the telescopic groove is also arc-shaped and contacts the two positioning blocks. The positioning blocks are made of ferromagnetic material. The electromagnet attracts the positioning blocks, and during operation, the two positioning blocks position the probe, preventing it from moving backward when subjected to force, thus ensuring detection accuracy. When the force on the probe exceeds the resistance of the two positioning blocks to the fixed shaft, the probe can move backward freely. This invention allows adjustment of the resistance of the two positioning blocks to the fixed shaft by changing the attraction of the electromagnet to the positioning blocks, thus facilitating the operator to control the magnitude of the force acting on the probe when it moves backward as needed.

[0013] Furthermore, a groove is provided on the outer wall of the fixed shaft near the mounting base, and a slider is provided on the end of the connecting base near the groove. The slider and the groove cooperate to ensure that the connecting base moves axially along the fixed shaft without rotation.

[0014] Compared with existing technologies, the advantages of this invention are as follows: Compared with current flying probe machines for PCB board inspection, this invention is equipped with a loading component and a guiding component. Through the cooperation of the loading component and the guiding component, PCB boards of different sizes and specifications are transported into the fixing mechanism. This ensures that PCB boards integrating high-end chips can be accurately moved to the middle position of the fixing mechanism, providing a solid foundation for the accuracy of subsequent probe testing. In addition, the loading component and guiding component in this invention can directly transport new PCB boards into the fixing mechanism after the PCB board inspection is completed, avoiding the need for traditional flying probe machines to first remove the previously inspected PCB board before... This invention eliminates the hassle of placing new PCBs into the fixing mechanism, effectively improving work efficiency and reducing the hassle of secondary positioning and calibration. Finally, when the probe collidees with the fixed shaft due to operator error, the probe automatically moves backward, effectively preventing damage caused by the collision. The magnitude of the force exerted on the probe during backward movement is set by the operator. That is, this invention can adjust the resistance of the two positioning blocks to the fixed shaft by changing the attraction of the electromagnet to the positioning blocks. The two positioning blocks can position the probe, preventing it from moving backward when encountering force, thus ensuring detection accuracy. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a front view of the present invention;

[0017] Figure 3This is a schematic diagram showing the position of the fixing mechanism of the present invention;

[0018] Figure 4 This is a schematic diagram showing the location of the feeding component of the present invention;

[0019] Figure 5 This is a schematic diagram of the guiding component structure of the present invention;

[0020] Figure 6 This is a schematic diagram of the feeding assembly structure of the present invention;

[0021] Figure 7 This is a schematic diagram of the upper clamp structure of the present invention;

[0022] Figure 8 This is a schematic diagram of the interior of the upper clamp of the present invention;

[0023] Figure 9 This is a schematic diagram of the lower clamp structure of the present invention;

[0024] Figure 10 This is a schematic diagram of the internal structure of the lower clamp of the present invention;

[0025] Figure 11 This is a schematic diagram of the detection mechanism of the present invention.

[0026] In the diagram: 1. Machine body; 2. Fixing mechanism; 21. Upper clamp; 211. First fixed seat; 212. First translation motor; 213. First limit seat; 2131. First adjusting cylinder; 2132. First fixing groove; 2133. First limit block; 21331. First sensing block; 2134. Second fixing groove; 22. Lower clamp; 221. Second fixed seat; 222. Second translation motor; 223. Second limit seat; 2232. Third fixing groove; 2234. Fourth fixing groove; 3. Top 4. Workbench; 41. First lifting module; 42. Second lifting module; 43. Movable seat; 44. Loading seat; 441. First loading slot; 442. Second loading slot; 443. Vacuum suction cup; 45. Fixing plate; 46. First guide rail; 461. Limiting plate; 462. Adjusting bolt; 47. Second guide rail; 5. Detection mechanism; 51. Mounting seat; 52. Detection needle; 521. Probe; 522. Connecting seat; 5221. Positioning block; 5222. Electromagnet; 523. Fixed shaft. Detailed Implementation

[0027] 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.

[0028] Example: Figures 1-11As shown, this invention provides a technical solution: a dust-free PCB flying probe machine with precise positioning function. The flying probe machine includes a body 1, a fixing mechanism 2, a top seat 3, a worktable 4, and a detection mechanism 5. The top seat 3 and the worktable 4 are respectively disposed at the upper and lower ends of the body 1. The fixing mechanism 2 is disposed between the top seat 3 and the worktable 4, and the fixing mechanism 2 and the worktable 4 are connected by a first lifting module 41. The detection mechanism 5 is disposed at the side end of the fixing mechanism 2, and the detection mechanism 5 is connected to the worktable 4 through a second lifting module 42 and a first horizontal moving module. The worktable 4 is internally provided with a feeding component and a guiding component, and the feeding component is connected to the worktable 4 through a second horizontal moving module. During operation, the invention transports PCBs of different sizes into the fixing mechanism 2 through the cooperation of the feeding component and the guiding component. The fixing mechanism 2 fixes the PCBs. After the PCBs are fixed, the second lifting module 42 and the first horizontal moving module control the detection mechanism 5 to perform lifting and horizontal linear movements to ensure that the detection mechanism 5 can detect each area of ​​the PCB.

[0029] like Figures 2-6 As shown, the feeding assembly includes a movable seat 43 and a feeding seat 44. The movable seat 43 is connected to the worktable 4 via a second horizontal moving module. The feeding seat 44 is movably mounted on the movable seat 43 via a screw assembly, which controls the lifting and lowering movement of the feeding seat 44. The feeding seat 44 is provided with a first feeding groove 441 and a second feeding groove 442. The guiding assembly includes two fixed plates 45, two first guide rails 46, and two second guide rails 47. The two fixed plates 45 are arranged opposite each other on both sides of the feeding seat 44. The two first guide rails 46 are arranged opposite each other on both sides of the first feeding groove 441, and the two second guide rails 47 are arranged opposite each other on both sides of the second feeding groove 442. Each first guide rail 46 is connected to the fixed plate 45 via a first telescopic cylinder. The second guide rails 47 are all connected to the fixed plate 45 through the second telescopic cylinder. In the initial stage of operation, the operator can place the PCB board to be tested into the first loading slot 441, and then drive the two first guide rails 46 to move closer to each other through the first telescopic cylinder to limit the PCB board to be tested. Then, the movable seat 43 and the loading seat 44 are moved to the bottom of the fixed mechanism 2 through the second horizontal moving module. Finally, the loading seat 44 and the PCB board to be tested are driven to rise through the lead screw assembly to transport the PCB board to be tested into the fixed mechanism 2. During the transportation process, the position of the PCB board to be tested is restricted by the two first guide rails 46 to ensure that the PCB board to be tested moves to the middle position of the fixed mechanism 2.

[0030] like Figures 3-6As shown, a vacuum suction cup 443 is installed in both the first loading trough 441 and the second loading trough 442. One vacuum suction cup 443 is connected to the first loading trough 441 via a first translation cylinder, and the other vacuum suction cup 443 is connected to the second loading trough 442 via a second translation cylinder. A limit plate 461 is installed inside the first guide rail 46, and the limit plate 461 is connected to the first guide rail 46 via an adjusting bolt 462. The structure and internal configuration of the second guide rail 47 are the same as those of the first guide rail 46. When the operator places the PCB board to be inspected into the first loading trough 441 and the two first guide rails 46 contact the side of the PCB board to be inspected, the operator... The operator can open the first translation cylinder on the side of the first loading trough 441 and turn the adjusting bolt 462 to move the vacuum suction cup 443 in the first loading trough 441 and the limiting plate 461 in the first guide rail 46. The vacuum suction cup 443 in the first loading trough 441 and the limiting plate 461 in the first guide rail 46 can limit the PCB board to be tested of different thicknesses, ensuring that the position of the PCB board to be tested does not shift during the process of rising into the fixing mechanism 2. At the same time, the vacuum suction cup 443 and the limiting plate 461 in this invention do not need to apply a large force when limiting the PCB board to be tested, preventing the side wall of the PCB board to be tested from being damaged due to excessive clamping force.

[0031] like Figures 4-10 As shown, the fixing mechanism 2 includes an upper clamp 21 and a lower clamp 22. The upper clamp 21 is connected to the first lifting module 41, and the lower clamp 22 is set on the worktable 4. The upper clamp 21 includes a first fixed seat 211 and a first limiting seat 213. The first limiting seat 213 is movably installed in the first fixed seat 211 by the first translation motor 212. The lower end of the first limiting seat 213 is provided with a first fixing groove 2132 and a second fixing groove 2134. The first fixing groove 2132 and the second fixing groove 2134 are both provided with first limiting components. The distance between the upper clamp 21 and the lower clamp 22 is controlled by the first lifting module 41, and the PCB board to be tested is limited and fixed by the first limiting components.

[0032] like Figures 4-10As shown, the lower clamp 22 includes a second fixed seat 221 and a second limiting seat 223. The second limiting seat 223 is movably mounted in the second fixed seat 221 via a second translation motor 222. The second limiting seat 223 is provided with a third fixing groove 2232 and a fourth fixing groove 2234. A second limiting component is provided in both the third fixing groove 2232 and the fourth fixing groove 2234. The first fixing groove 2132 is aligned with the third fixing groove 2232, and the second fixing groove 2134 is aligned with the fourth fixing groove 2234. In this invention, during the upward movement of the PCB board to be tested in the first loading groove 441, the PCB board to be tested will pass through the fourth fixing groove 2234 and the second fixing groove 2134, and pass through the second limiting component in the fourth fixing groove 2234. The first limiting component in the second fixing slot 2134 limits and fixes the PCB board to be tested. After the PCB board to be tested is fixed in the second fixing slot 2134 and the fourth fixing slot 2234, the operator can use the lead screw assembly to move the loading seat 44 down to the initial position, and then place the next PCB board to be tested into the second loading slot 442. The vacuum suction cup 443 in the second loading slot 442 and the limiting plate 461 in the second guide rail 47 limit the PCB board to be tested in the second loading slot 442. After the PCB boards in the second fixing slot 2134 and the fourth fixing slot 2234 are tested, the operator can use the lead screw assembly to raise the loading seat 44 and the PCB board to be tested in the second loading slot 442. At this time, the first The PCB board to be tested in the second loading slot 442 passes through the third fixing slot 2232 and the first fixing slot 2132. The second limiting component in the third fixing slot 2232 and the first limiting component in the first fixing slot 2132 can fix the PCB board to be tested in the second loading slot 442 into the fixing mechanism 2. Then, the operator can close the second limiting component in the fourth fixing slot 2234 and the first limiting component in the second fixing slot 2134, and then open the vacuum suction cup 443 in the first loading slot 441. The vacuum suction cup 443 in the first loading slot 441 can hold the tested PCB board in place. At this time, the operator can use the lead screw assembly to lower the loading seat 44 and the tested PCB board in the first loading slot 441. After the worker removes the PCB board that has been inspected from the first loading slot 441, the first translation motor 212 and the second translation motor 222 are activated. The first and second limiting seats 213 and 223 move synchronously through the first and second translation motors 212 and 222 until the distance between the PCB board to be inspected in the third fixing slot 2232 and the first fixing slot 2132 and the inspection mechanism 5 is the rated distance. Compared with current flying probe machines for PCB inspection, this invention can directly move a new PCB board to be inspected into the fixing mechanism 2 when the previous PCB board has been inspected but not yet removed, avoiding the hassle of first removing the previously inspected PCB board and then placing the new PCB board into the fixing mechanism 2.Through the above technical solution, this invention effectively improves work efficiency while reducing the hassle of secondary positioning and calibration.

[0033] like Figures 7-10 As shown, the first limiting component includes a first adjusting cylinder 2131 and a first limiting block 2133. The first limiting block 2133 is disposed at the working end of the first adjusting cylinder 2131. A first piezoelectric sheet is disposed on the wall surface of the first limiting block 2133 away from the first adjusting cylinder 2131. A first sensing block 21331 is disposed inside the end of the first limiting block 2133 away from the first adjusting cylinder 2131. The first sensing block 21331 and the first limiting block 2133 are connected by a sensing spring. The structure of the second limiting component is the same as that of the first limiting component. When the first limiting component is not working, the first sensing block 21331 extends out of the first limiting block 2133. When the PCB board to be tested moves into the first fixing groove 2132 or the second fixing groove 2134, the first adjusting cylinder 2131 can drive the first limiting block 2133 to move. At this time, the first sensing block 21331 inside the first limiting block 2133 will contact the PCB board to be tested first. When the first limiting block 2133 continues to move, the first piezoelectric piece on the first limiting block 2133 will contact the PCB board to be tested and generate a set of electrical signals. The operator can determine whether the first limiting block 2133 is in contact with the PCB board to be tested through this set of electrical signals, so as to facilitate timely closing of the first adjusting cylinder 2131 and prevent the side end of the PCB board to be tested from being damaged due to excessive clamping force. Finally, when the PCB board to be tested is fixed in the first fixing groove 2132 or the second fixing groove 2134, it is subject to the clamping force of the first limiting block 2133 and the elastic force of the sensing spring. Through the above technical solution, the phenomenon that the PCB board to be tested will detach from the fixing mechanism 2 due to insufficient clamping force when the first adjusting cylinder 2131 fails is effectively avoided.

[0034] like Figure 2 , Figure 11 As shown, there are two sets of second lifting modules 42. The two sets of second lifting modules 42 are movably mounted on the worktable 4 via the first horizontal moving module. Each set of second lifting modules 42 is equipped with a detection mechanism 5. The detection mechanism 5 includes a mounting base 51 and a detection needle 52. The mounting base 51 is located at the working end of the second lifting module 42, and the detection needle 52 is located at the end of the mounting base 51 near the fixing mechanism 2. The two sets of second lifting modules 42 and the first horizontal moving module control the lifting and horizontal movement of the two sets of detection mechanisms 5, thereby ensuring that the PCB board can be inspected from all angles.

[0035] like Figure 11As shown, the detection needle 52 includes a probe 521, a connecting seat 522, and a fixed shaft 523. The connecting seat 522 has a telescopic groove. The probe 521 is located at the end of the connecting seat 522 away from the mounting seat 51. One end of the fixed shaft 523 is connected to the mounting seat 51, and the other end of the fixed shaft 523 is wound with a spring and extends into the telescopic groove. If the probe 521 is damaged due to operator error, the probe 521 will be subjected to a large force. At this time, the probe 521 will compress the spring on the fixed shaft 523, thereby causing the probe 521 to move backward. Through the above technical solution, the present invention effectively avoids the phenomenon of probe 521 being damaged due to impact.

[0036] like Figure 11 As shown, a positioning groove is provided inside the connecting seat 522 near the probe 521. A set of cavities is arranged opposite each other at the upper and lower ends of the positioning groove. Each cavity contains a positioning block 5221 and an electromagnet 5222. The end of each positioning block 5221 near the positioning groove is arc-shaped and extends into the positioning groove. The end of the fixing shaft 523 extending into the telescopic groove is arc-shaped and contacts the two positioning blocks 5221. The positioning blocks 5221 are made of ferromagnetic material. The electromagnet 5222 attracts and fixes the positioning blocks 5221 during operation. The two positioning blocks 5221 can be used to position the probe 521, preventing the probe 521 from moving backward when it encounters a force, thus ensuring the detection accuracy. When the force on the probe 521 is greater than the resistance of the two positioning blocks 5221 to the fixed shaft 523, the probe 521 can move backward freely. The present invention can adjust the resistance of the two positioning blocks 5221 to the fixed shaft 523 by changing the attraction of the electromagnet 5222 to the positioning blocks 5221, thus making it convenient for the staff to control the magnitude of the force on the probe 521 when it moves backward as needed.

[0037] like Figure 11 As shown, a groove is provided on the outer wall of the fixed shaft 523 near the mounting base 51, and a slider is provided on the end of the connecting base 522 near the groove. The slider and the groove cooperate to ensure that the connecting base 522 moves axially along the fixed shaft 523 without rotating.

[0038] The working principle of this invention is as follows: In the initial stage, the operator can place the PCB board to be inspected into the first loading slot 441. Then, the first telescopic cylinder drives the two first guide rails 46 to move closer together, thereby limiting the position of the PCB board to be inspected. Next, the second horizontal moving module moves the movable seat 43 and the loading seat 44 to directly below the fixed mechanism 2. Finally, the lead screw assembly drives the loading seat 44 and the PCB board to be inspected to rise, so as to transport the PCB board to be inspected into the fixed mechanism 2. During the transportation process, the position of the PCB board to be inspected is limited by the two first guide rails 46. After the PCB board is fixed in the second fixing slot 2134 and the fourth fixing slot 2234, the operator can use the lead screw assembly to move the loading seat 44 down to the initial position, and then place the next PCB board to be tested into the second loading slot 442. The second lifting module 42 and the first horizontal moving module control the detection mechanism 5 to perform lifting and horizontal linear movements to ensure that the detection mechanism 5 can detect each area of ​​the PCB board to be tested in the fixing mechanism 2. At the same time as detecting the PCB board, the vacuum suction cup 443 in the second loading slot 442 and the limiting plate 461 in the second guide rail 47 are used to control the second loading seat 442. The PCB board to be tested in the feed trough 442 is limited. After the PCB boards in the second fixing trough 2134 and the fourth fixing trough 2234 have been tested, the operator can use the lead screw assembly to raise the PCB board to be tested in the feed seat 44 and the second feed trough 442. The second limiting component in the third fixing trough 2232 and the first limiting component in the first fixing trough 2132 can fix the PCB board to be tested in the second feed trough 442 into the fixing mechanism 2. Then the operator can close the second limiting component in the fourth fixing trough 2234 and the first limiting component in the second fixing trough 2134. The vacuum suction cup 443 in the first loading slot 441 is activated, and the PCB board that has been inspected can be held in place by the vacuum suction cup 443 in the first loading slot 441. The screw assembly causes the loading seat 44 and the PCB board that has been inspected in the first loading slot 441 to move down. Then the first translation motor 212 and the second translation motor 222 are activated, and the first limit seat 213 and the second limit seat 223 move synchronously until the distance between the PCB board to be inspected in the third fixing slot 2232 and the first fixing slot 2132 and the inspection mechanism 5 is the rated distance.

[0039] 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dust-free PCB flying probe machine with precise positioning function, characterized in that: The flying needle machine includes a body (1), a fixing mechanism (2), a top seat (3), a worktable (4), and a detection mechanism (5). The top seat (3) and the worktable (4) are respectively located at the upper and lower ends of the body (1). The fixing mechanism (2) is located between the top seat (3) and the worktable (4). The detection mechanism (5) is located at the side end of the fixing mechanism (2). The worktable (4) is equipped with a feeding component and a guiding component. Through the cooperation of the feeding component and the guiding component, PCB boards of different sizes are transported into the fixing mechanism (2). The feeding assembly includes a movable seat (43) and a feeding seat (44). The feeding seat (44) is movably mounted on the movable seat (43) via a screw assembly. The feeding seat (44) is provided with a first feeding groove (441) and a second feeding groove (442). The guide assembly includes two fixed plates (45), two first guide rails (46), and two second guide rails (47). The two fixed plates (45) are arranged opposite to each other on both sides of the feeding seat (44). The two first guide rails (46) are arranged opposite to each other on both sides of the first feeding groove (441). The two second guide rails (47) are arranged opposite to each other on both sides of the second feeding groove (442). Each first guide rail (46) is connected to the fixed plate (45) via a first telescopic cylinder. Each second guide rail (47) is connected to the fixed plate (45) via a second telescopic cylinder. A vacuum suction cup (443) is provided in both the first feeding trough (441) and the second feeding trough (442). One of the vacuum suction cups (443) is connected to the first feeding trough (441) through a first translation cylinder, and the other vacuum suction cup (443) is connected to the second feeding trough (442) through a second translation cylinder. A limit plate (461) is provided in the first guide rail (46). The limit plate (461) is connected to the first guide rail (46) through an adjusting bolt (462). The structure and internal configuration of the second guide rail (47) are the same as those of the first guide rail (46).

2. The fly probe machine for PCBs with precise positioning function according to claim 1, characterized in that: The fixing mechanism (2) includes an upper clamp (21) and a lower clamp (22). The upper clamp (21) is connected to the worktable (4) through a first lifting module (41). The lower clamp (22) is set on the worktable (4). The upper clamp (21) includes a first fixed seat (211) and a first limiting seat (213). The first limiting seat (213) is movably installed in the first fixed seat (211) through a first translation motor (212). The lower end of the first limiting seat (213) is provided with a first fixing groove (2132) and a second fixing groove (2134). A first limiting component is provided in both the first fixing groove (2132) and the second fixing groove (2134).

3. A dust-free PCB flying probe machine with precise positioning function according to claim 2, characterized in that: The lower clamp (22) includes a second fixed seat (221) and a second limiting seat (223). The second limiting seat (223) is movably installed in the second fixed seat (221) by a second translation motor (222). The second limiting seat (223) is provided with a third fixing groove (2232) and a fourth fixing groove (2234). A second limiting component is provided in both the third fixing groove (2232) and the fourth fixing groove (2234).

4. A dust-free PCB flying probe machine with precise positioning function according to claim 3, characterized in that: The first limiting component includes a first adjusting cylinder (2131) and a first limiting block (2133). The first limiting block (2133) is disposed at the working end of the first adjusting cylinder (2131). A first piezoelectric sheet is disposed on the wall surface of the first limiting block (2133) away from the first adjusting cylinder (2131). A first sensing block (21331) is disposed inside the end of the first limiting block (2133) away from the first adjusting cylinder (2131). The first sensing block (21331) and the first limiting block (2133) are connected by a sensing spring. The structure of the second limiting component is the same as that of the first limiting component.

5. A dust-free PCB flying probe machine with precise positioning function according to claim 1, characterized in that: Two sets of second lifting modules (42) are provided on the workbench (4). Both sets of second lifting modules (42) are movably installed on the workbench (4) through the first horizontal moving module. Each set of second lifting modules (42) is provided with a detection mechanism (5). The detection mechanism (5) includes a mounting base (51) and a detection needle (52). The mounting base (51) is located at the working end of the second lifting module (42), and the detection needle (52) is located at the end of the mounting base (51) near the fixing mechanism (2).

6. A dust-free PCB flying probe machine with precise positioning function according to claim 5, characterized in that: The detection needle (52) includes a probe (521), a connecting seat (522), and a fixed shaft (523). The connecting seat (522) has a telescopic groove. The probe (521) is located at the end of the connecting seat (522) away from the mounting seat (51). One end of the fixed shaft (523) is connected to the mounting seat (51), and the other end of the fixed shaft (523) is wound with a spring and extends into the telescopic groove.

7. A dust-free PCB flying probe machine with precise positioning function according to claim 6, characterized in that: The connecting seat (522) has a positioning groove at one end near the probe (521). The upper and lower ends of the positioning groove are provided with a set of cavities. Each set of cavities is provided with a positioning block (5221) and an electromagnet (5222). The end of each positioning block (5221) near the positioning groove is an arc-shaped structure and extends into the positioning groove. The end of the fixed shaft (523) that extends into the telescopic groove is an arc-shaped structure and contacts the two positioning blocks (5221).

8. A dust-free PCB flying probe machine with precise positioning function according to claim 7, characterized in that: The fixed shaft (523) has a groove on the outer wall of one end near the mounting base (51), and the connecting base (522) has a slider at one end near the groove, the slider cooperating with the groove.

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