CN118818267A - A circuit board testing device based on mechanical positioning - Google Patents

Abstract

The invention relates to the technical field of circuit board testing and discloses a circuit board testing device based on mechanical positioning, which comprises a workbench, an automatic feeding mechanism arranged on the workbench and a disc-shaped testing table rotatably arranged on the workbench, wherein a plurality of positioning tool mechanisms are uniformly distributed on the disc-shaped testing table around the circumferential direction of the disc-shaped testing table, each positioning tool mechanism comprises a positioning platform and a vibrating mechanism, an end surface positioning block and a side surface positioning block are fixed at the top of the positioning platform, the end surface positioning block and the side surface positioning block are connected at right angles to form a right-angle positioning piece, the vibrating mechanism is arranged below the positioning platform, the vibrating mechanism is used for vibrating the positioning platform, the deflection axis of the positioning platform is perpendicular to the diagonal line of the right-angle positioning piece, the positioning platform has two states, and the right-angle positioning piece is positioned at the low end position by deflection of the positioning platform during positioning; during testing, the positioning platform is in a horizontal state, and has the advantages of high positioning accuracy, high positioning efficiency and small damage to the circuit board.

Description

A circuit board testing device based on mechanical positioning

Technical Field

The invention relates to the technical field of circuit board testing, in particular to a circuit board testing device based on mechanical positioning.

Background Art

The names of circuit boards include: ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards and circuit boards. Circuit boards make circuits miniaturized and intuitive, and play an important role in the mass production of fixed circuits and the optimization of electrical appliance layout. The design and testing process of circuit boards are extremely important to product quality. After the circuit board is completed, it needs to be tested and qualified before it can be put into use. The test of the circuit board includes the test of the conductive performance, the test of the surface integrity of the circuit board, etc. For this reason, the test bench is currently used to power on the power pins of the circuit board for detection, and the surface integrity of the circuit board is tested by visual imaging. The positioning of the circuit board is particularly important in the test of the circuit board, which is directly related to the accuracy of the test results. The tooling positioning of the existing test bench uses a clamp or a clamp to position the circuit board. This method is easy to increase the force acting on the circuit board due to uneven force between the clamps, thereby damaging the circuit board. At the same time, this method can only perform single positioning in the X-axis direction or the Y-axis direction. When the X-axis or Y-axis direction is limited by the clamp, the clamp in the Y-axis direction or the X-axis direction is difficult to push the circuit board to move for positioning in the Y-axis direction or the X-axis direction, resulting in poor positioning accuracy, high degree of damage to the circuit board, and low positioning efficiency.

Summary of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a circuit board testing device based on mechanical positioning to solve the deficiencies of the prior art.

The objective of the present invention is achieved through the following technical solutions: a testing device for a circuit board based on mechanical positioning, comprising a workbench, an automatic feeding mechanism arranged on the workbench, and a disc-shaped test table rotatably arranged on the workbench, the disc-shaped test table is evenly provided with a plurality of positioning fixture mechanisms around its own circumferential direction, the positioning fixture mechanism comprises a positioning platform and a vibration mechanism, an end face positioning block and a side face positioning block are fixed on the top of the positioning platform, the end face positioning block and the side face positioning block are connected at a right angle to form a right angle positioning piece, the vibration mechanism is arranged below the positioning platform, the vibration mechanism is used to make the positioning platform vibrate, the positioning platform has a deflection degree of freedom, the deflection axis of the positioning platform is perpendicular to the diagonal of the right angle positioning piece, the positioning platform has two states, when positioning, the positioning platform is deflected to make the right angle positioning piece be in a low end position; when testing, the positioning platform is in a horizontal state;

The automatic feeding mechanism includes a hollow feeding box and a conveying mechanism. Two groups of conveying mechanisms are symmetrically arranged in the hollow feeding box. The conveying mechanism includes an annular conveying line and a support plate. A conveying cavity is formed between the inner wall and the outer wall of the hollow feeding box. The annular conveying line is arranged in the conveying cavity. A plurality of support plates are arranged at equal intervals along the conveying direction on the annular conveying line. A vertical slide groove is opened through the inner wall of the hollow feeding box along its own height direction. The vertical slide groove is connected to the conveying cavity. The support plate penetrates into the hollow feeding box through the vertical slide groove.

Furthermore, the annular conveyor line includes a rotatably mounted driving pulley and a driven pulley, the driving pulley and the driven pulley are spaced apart along the height direction of the hollow loading box, the driving pulley is connected to the driven pulley through a conveying belt transmission, the support plate is installed on the conveying belt, a conveying motor is installed on the outer wall of the hollow loading box, and the output shaft of the conveying motor is connected to the driving pulley.

Furthermore, the positioning tooling mechanism also includes a support platform, which is fixedly mounted on the disc-shaped test bench, a ball-jointed support column is fixed on the top of the disc-shaped test bench, a central spherical hinge of the positioning platform is connected to the ball-jointed support column, springs are connected to the four corners of the bottom of the positioning platform, the springs are connected to the support platform, two groups of positioning cylinders are installed on the support platform, and the two groups of positioning cylinders are arranged at intervals along the diagonal of the right-angle positioning piece.

Furthermore, a blowing cavity and an adsorption cavity are arranged at intervals along the horizontal direction in the positioning platform, and a plurality of blowing holes and negative pressure holes are evenly opened on the top surface of the positioning platform, and the blowing holes and the negative pressure holes are respectively connected to the blowing cavity and the adsorption cavity, and the blowing holes are opened obliquely toward the diagonal line of the right-angle positioning piece, and the vibration mechanism adopts an exciter, and the exciter is installed on the supporting platform, and the vibration axis of the exciter contacts the positioning platform.

Furthermore, a flipping mechanism is provided on the workbench, and the flipping mechanism is located on the rotation path of the positioning tooling mechanism. The flipping mechanism includes a flipping frame, a lifting seat, a rotating seat and a vacuum beam. The flipping frame is installed on the workbench, and the lifting seat is slidably arranged on the flipping frame. The lifting seat has the freedom to move along the height direction of the flipping frame, and the rotating seat is rotatably arranged on the lifting seat, and the rotation axis of the rotating seat is vertically arranged. A flipping axis is rotatably arranged on the rotating seat, and the rotation axis of the flipping axis is perpendicular to the rotation axis of the rotating seat. One end of the vacuum beam is connected to the flipping axis, and the other end is connected to a negative pressure suction cup, and the adsorption port of the negative pressure suction cup is vertically arranged downward.

Furthermore, a lead screw is rotatably installed on the flip frame, the lifting seat is threadedly mounted on the lead screw, a lead screw motor is installed on the flip frame, the output shaft of the lead screw motor is drivingly connected to the lead screw, a first main shaft is fixed to the bottom of the rotating seat, the first main shaft is rotatably connected to the lifting seat, a first motor is installed at the bottom of the lifting seat, the output shaft of the first motor is drivingly connected to the first main shaft, a second motor is installed on the top of the rotating seat, and the output shaft of the second motor is drivingly connected to the flip shaft via a bevel gear set.

Furthermore, the positioning platform and the supporting platform are both provided with avoidance windows along the moving direction of the lifting seat, and the bottom of the supporting platform is connected to the disc-shaped test table through a vertical plate to form a rotation space between the supporting platform and the disc-shaped test table. After flipping the circuit board, the vacuum beam passes through the avoidance window and moves into the rotation space, and deflects in the rotation space to avoid the positioning tooling mechanism and reset.

Furthermore, two groups of test mechanisms are arranged on the workbench, and the flipping mechanism is located between the two groups of test mechanisms. The test mechanisms include a test lifting seat, a test switching board, a test box and an industrial camera. The test lifting seat has the freedom to move axially along the disc-shaped test table. The test switching board is rotatably mounted on the test lifting seat, and the deflection axis of the test switching board is parallel to the axis of the disc-shaped test table. The test box and the industrial camera are respectively installed on the bottom of both ends of the test switching board. A test circuit board is arranged in the test box, and a test probe is arranged on the test circuit board, and the test probe matches the test hole on the circuit board.

Furthermore, the testing mechanism also includes a lifting cylinder, the cylinder body of the lifting cylinder is installed on the workbench, the telescopic shaft of the lifting cylinder is connected to the test lifting seat, the center of the test switching plate is connected to a switching shaft, the switching shaft is rotatably connected to the test lifting seat, and a switching motor is installed at the bottom of the test lifting seat, and the output shaft of the switching motor is transmission-connected to the switching shaft.

Furthermore, a loading and unloading mechanism is provided on the workbench, and the loading and unloading mechanism is used to remove the tested circuit board from the positioning fixture mechanism. The loading and unloading mechanism includes a linear drive module, a loading and unloading base and a negative pressure loading and unloading suction cup. The top of the loading and unloading base is rotatably connected to a loading and unloading mounting plate, and the linear drive module is vertically installed on the loading and unloading mounting plate. A loading and unloading beam is connected to the sliding seat of the linear drive module, and the negative pressure loading and unloading suction cup is installed on the loading and unloading beam. A loading and unloading motor is installed on the loading and unloading base, and the output shaft of the loading and unloading motor is drivingly connected to the loading and unloading mounting plate.

The beneficial effects of the present invention are:

1. The circuit board is placed on the positioning platform. During positioning, the positioning platform is deflected to an inclined state, so that the right-angle positioning piece is in a low position. The circuit board's own gravity is used in conjunction with the vibration generated by the vibration mechanism to move the circuit board without squeezing, so that the two right-angle sides of the circuit board contact the end face positioning block and the side positioning block respectively to complete rapid positioning, which has the advantages of high positioning accuracy, high positioning efficiency and little damage to the circuit board.

2. The circuit boards to be tested are placed on the positioning platform for positioning in sequence through the automatic loading mechanism, and the circuit boards to be processed are transported to the testing mechanism for testing in sequence through the disc-shaped test table. Finally, the tested circuit boards are unloaded through the loading and unloading mechanism, thereby realizing automated testing, improving test efficiency and reducing labor costs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective schematic diagram of a circuit board testing device based on mechanical positioning according to the present invention;

FIG2 is a schematic diagram of a positioning fixture mechanism in a circuit board testing device based on mechanical positioning according to the present invention;

FIG3 is a second schematic diagram of a positioning fixture mechanism in a circuit board testing device based on mechanical positioning according to the present invention;

FIG4 is a second perspective schematic diagram of a circuit board testing device based on mechanical positioning according to the present invention;

FIG5 is a third perspective schematic diagram of a circuit board testing device based on mechanical positioning according to the present invention;

FIG6 is a schematic diagram of the internal structure of a hollow loading box in a circuit board testing device based on mechanical positioning according to the present invention;

FIG7 is a top view of a positioning platform in a circuit board testing device based on mechanical positioning according to the present invention;

Fig. 8 is a cross-sectional view along the line A-A in Fig. 7;

In the figure, 1-workbench, 2-disc test bench, 3-positioning platform, 4-end face positioning block, 5-side positioning block, 6-hollow loading box, 7-support plate, 8-conveying chamber, 9-vertical slide, 10-driving pulley, 11-driven pulley, 12-conveying belt, 13-conveying motor, 14-support platform, 15-ball joint support column, 16-spring, 17-positioning cylinder, 18-blowing chamber, 19-adsorption chamber, 20-blowing hole, 21-negative pressure hole, 22-vibrator, 23-turning frame, 24-lifting seat, 25-rotating Seat, 26-vacuum beam, 27-flip axis, 28-negative pressure suction cup, 29-screw, 30-screw motor, 31-first spindle, 32-first motor, 33-second motor, 34-avoidance window, 35-vertical plate, 36-test lifting seat, 37-test switching board, 38-test box, 39-industrial camera, 40-lifting cylinder, 41-switching axis, 42-switching motor, 43-linear drive module, 44-unloading base, 45-negative pressure unloading suction cup, 46-unloading mounting plate, 47-unloading beam, 48-unloading motor.

DETAILED DESCRIPTION

The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

Embodiment 1: As shown in Figures 1 to 8, a circuit board testing device based on mechanical positioning includes a workbench 1, an automatic feeding mechanism arranged on the workbench 1, and a disc-shaped test table 2 rotatably arranged on the workbench 1. The disc-shaped test table 2 is evenly provided with a plurality of positioning fixture mechanisms around its own circumferential direction. The positioning fixture mechanism includes a positioning platform 3 and a vibration mechanism. An end face positioning block 4 and a side face positioning block 5 are fixed on the top of the positioning platform 3. The end face positioning block 4 and the side face positioning block 5 are connected at a right angle to form a right-angle positioning piece. The vibration mechanism is arranged below the positioning platform 3. The vibration mechanism is used to vibrate the positioning platform 3. The positioning platform 3 has a deflection degree of freedom. The deflection axis of the positioning platform 3 is perpendicular to the diagonal of the right-angle positioning piece. The positioning platform 3 has two states. When positioning, the positioning platform 3 deflects to make the straight The corner positioning piece is in the low end position; during the test, the positioning platform 3 is in a horizontal state, the disc-shaped test table 2 is connected to the workbench 1 through the rotation of the main shaft, and the main shaft is driven to rotate by the servo motor, thereby driving the disc-shaped test table 2 to rotate. The disc-shaped test table 2 rotates intermittently, so that each positioning platform 3 can be moved to the station of the automatic loading mechanism in turn, and the circuit board to be tested is loaded onto the positioning platform 3 through the automatic loading mechanism. Then, the disc-shaped test table 2 drives the positioning platform 3 to move to the test station, and moves the next positioning platform 3 to the automatic loading mechanism for loading. In the process of moving to the test station, the positioning platform 3 switches to the positioning state, that is, the positioning platform 3 deflects to the inclined state so that the right-angle positioning piece is in the low end position. Since the deflection axis of the positioning platform 3 is perpendicular to the diagonal of the right-angle positioning piece, the diagonal is The bisector of the angle between the end face positioning block 4 and the side positioning block 5 is formed, so that the end face positioning block 4 and the side positioning block 5 are both in an inclined state, and the connection position between the end face positioning block 4 and the side positioning block 5 is in a low end position, so that the circuit board on the positioning platform 3 has a movement tendency to move toward the right-angle positioning piece. At this time, the positioning platform 3 is driven to vibrate by the vibration mechanism, so that the circuit board moves on the positioning platform 3 for position adjustment, so that the two right-angle sides of the circuit board contact the end face positioning block 4 and the side positioning block 5 respectively to complete the rapid positioning, which has the advantages of high positioning accuracy, high positioning efficiency and little damage to the circuit board; when the positioning is completed, the positioning platform 3 needs to be switched back to a horizontal state. In order to ensure that the circuit board does not deviate during the deflection of the positioning platform 3, further, blowing holes are arranged at intervals in the horizontal direction inside the positioning platform 3. The air cavity 18 and the adsorption cavity 19, the top surface of the positioning platform 3 is evenly provided with a plurality of blowing holes 20 and negative pressure holes 21, the blowing holes 20 and the negative pressure holes 21 are connected to the blowing cavity 18 and the adsorption cavity 19 respectively, the blowing holes 20 are inclined toward the diagonal of the right-angle positioning piece, an air pump and a vacuum pump are arranged on the workbench 1, the air pump is connected to the blowing cavity 18 through a pipeline, and the vacuum pump is connected to the adsorption cavity 19 through a pipeline. When the positioning of the circuit board is completed, the vacuum pump generates negative pressure through the negative pressure hole 21 to adsorb the circuit board, thereby positioning the circuit board on the positioning platform 3, ensuring that the circuit board will not be offset during the rotation of the positioning platform 3 and the test process, thereby ensuring the accuracy of the test, and secondly, the use of negative pressure for tooling can make the circuit board in a fully exposed state, so that there will be no interference during the test process.

Embodiment 2: The automatic loading mechanism needs to load the circuit boards to be processed onto the positioning platform 3 one by one. Therefore, on the basis of embodiment 1, as shown in Figures 1 and 4 to 6, the automatic loading mechanism includes a hollow loading box 6 and a conveying mechanism. Two groups of conveying mechanisms are symmetrically arranged in the hollow loading box 6. The conveying mechanism includes an annular conveyor line and a support plate 7. A conveying cavity 8 is formed between the inner wall and the outer wall of the hollow loading box 6. The annular conveyor line is arranged in the conveying cavity 8. A plurality of support plates 7 are arranged at equal intervals along the conveying direction on the annular conveyor line. A vertical slide groove 9 is opened through the inner wall of the hollow loading box 6 along its own height direction. The vertical slide groove 9 is connected to the conveying cavity 8. The support plate 7 penetrates into the hollow loading box 6 through the vertical slide groove 9. The circuit board is supported by the support plate 7 so that there is a certain gap between two adjacent circuit boards to avoid scratches or crushing caused by stacking of circuit boards. The annular conveyor line includes an active rotatable installation. The pulley 10 and the driven pulley 11 are arranged at intervals along the height direction of the hollow loading box 6. The driving pulley 10 is connected to the driven pulley 11 through a conveying belt 12. The support plate 7 is installed on the conveying belt 12. The outer wall of the hollow loading box 6 is installed with a conveying motor 13. The output shaft of the conveying motor 13 is connected to the driving pulley 10. The conveying motor 13 drives the driving pulley 10 to rotate. The driving pulley 10 drives the driven pulley 11 to rotate through the conveying belt 12, so that the conveying belt 12 rotates in a cycle, so that the support plate 7 drives the circuit board to move from top to bottom. When the support plate 7 of the bottom circuit board moves back upward, the support plate 7 will gradually separate from the circuit board, so that the circuit board falls on the positioning platform 3. Since there is a certain difference in the position where the circuit board falls on the positioning platform 3, it is necessary to position the circuit board to ensure that the test results have high accuracy.

Embodiment 3: Based on the embodiment 2, as shown in FIGS. 1 to 8, the positioning fixture mechanism further includes a support platform 14, the support platform 14 is fixedly mounted on the disc-shaped test bench 2, a ball joint support column 15 is fixed on the top of the disc-shaped test bench 2, the central ball of the positioning platform 3 is hinged on the ball joint support column 15, the bottom four corners of the positioning platform 3 are all connected with springs 16, the springs 16 are connected to the support platform 14, and two groups of positioning cylinders 17 are installed on the support platform 14, and the two groups of positioning cylinders 17 are arranged along the diagonal positions of the right-angle positioning member. The positioning platform 3 is arranged in a horizontally spaced arrangement. A blowing cavity 18 and an adsorption cavity 19 are arranged in a spaced arrangement in the horizontal direction. A plurality of blowing holes 20 and negative pressure holes 21 are evenly arranged on the top surface of the positioning platform 3. The blowing holes 20 and the negative pressure holes 21 are connected to the blowing cavity 18 and the adsorption cavity 19 respectively. The blowing holes 20 are inclined toward the diagonal line of the right-angle positioning piece. The vibration mechanism adopts an exciter 22, which is installed on the supporting platform 14. The vibration axis of the exciter 22 contacts the positioning platform 3. When the positioning platform 3 is in a horizontal test state, The telescopic axes of the two groups of positioning cylinders 17 are arranged at the same height, and the positioning platform 3 is supported by the two groups of positioning cylinders 17 so that it can be stably in a horizontal state. When positioning the circuit board, the positioning cylinder 17 away from the right-angle positioning piece extends to lift the positioning platform 3, and the other positioning cylinder 17 contracts accordingly to avoid interference. Since the positioning platform 3 and the ball-jointed support column 15 are spherically hinged, the positioning platform 3 can be smoothly deflected and switched to the positioning state, and the positioning platform 3 is further maintained stable by four groups of springs 16. During the positioning process, in order to reduce the friction between the circuit board and the positioning platform 3, the circuit board is blown up through the blowing hole 20 to reduce the positive pressure between the circuit board and the positioning platform 3, thereby reducing the friction between the circuit board and the positioning platform 3, and avoiding the wear of the circuit board during the positioning process. Secondly, the blowing hole 20 is inclined toward the connection position of the end face positioning block 4 and the side positioning block 5, so that the blown gas can drive the circuit board to move close to the right-angle positioning piece for positioning, thereby improving the positioning efficiency and greatly reducing the defective product rate.

Embodiment 4: On the basis of embodiment 3, as shown in FIG1, FIG4 and FIG5, two groups of test mechanisms are arranged on the workbench 1, and the two groups of test mechanisms respectively test the front and back sides of the circuit board, and the test mechanism comprises a test lifting seat 36, a test switching board 37, a test box 38 and an industrial camera 39, and the test lifting seat 36 has the freedom to move along the axial direction of the disc-shaped test table 2, and the test switching board 37 is rotatably mounted on the test lifting seat 36, and the deflection axis of the test switching board 37 is parallel to the axis of the disc-shaped test table 2, and the bottom of the two ends of the test switching board 37 is respectively installed with a test box 38 and an industrial camera 39, and the inside of the test box 38 is provided with a plurality of test boxes and an industrial camera 39. A test circuit board is provided, and a test probe is provided on the test circuit board, and the test probe matches the test hole on the circuit board. The test mechanism also includes a lifting cylinder 40, and the cylinder body of the lifting cylinder 40 is installed on the workbench 1. The telescopic shaft of the lifting cylinder 40 is connected to the test lifting seat 36. The center of the test switching plate 37 is connected to a switching shaft 41, and the switching shaft 41 is rotatably connected to the test lifting seat 36. A switching motor 42 is installed at the bottom of the test lifting seat 36, and the output shaft of the switching motor 42 is connected to the switching shaft 41. The test box 38 and the industrial camera 39 can be switched to the top of the positioning platform 3, and the circuit board rotates after the positioning tooling. At one of the test mechanisms, the switching motor 42 drives the switching shaft 41 to rotate, and the switching shaft 41 drives the test switching plate 37 to deflect, first switching the industrial camera 39 to the working state, and imaging the upper surface of the circuit board through the industrial camera 39, so as to test the integrity of the circuit board surface and determine whether there are problems such as damage, wear or scratches on the surface of the circuit board. This belongs to machine vision imaging technology and will not be repeated. When the test result is unqualified, the unqualified circuit board is removed from the positioning platform 3 through the loading and unloading mechanism. When the test result is qualified, the test switching plate 37 deflects and drives the test box 38 to be in the working state, and the lifting cylinder 40 The test box 38 is driven to move close to the circuit board so that the test probe is matched with the test hole of the circuit board, so that the circuit board is electrically connected to the test circuit, and the conductivity and other properties of the circuit board are tested. This belongs to the prior art and will not be repeated here. In specific implementation, the test box 38 is installed on the test switching board 37 by bolts, so that the test box 38 can be easily disassembled and replaced, so that the corresponding test box 38 is installed according to the production model of the circuit board, so that the test probe of the test box 38 is matched with the corresponding circuit board to complete the test, so that it can adapt to different models of circuit boards for testing operations, has a wide range of use, and improves the test accuracy by improving the positioning accuracy.

Embodiment 5: Since the surface integrity of the circuit board needs to be tested on two sides, namely the front side and the back side, the circuit board needs to be turned over 180°. Therefore, on the basis of Embodiment 4, as shown in Figures 1, 4 and 5, a flipping mechanism is provided on the workbench 1. The flipping mechanism is located between the two groups of test mechanisms, and the flipping mechanism is located on the rotation path of the positioning fixture mechanism. The flipping mechanism includes a flipping frame 23, a lifting seat 24, a rotating seat 25 and a vacuum beam 26. The flipping frame 23 is installed on the workbench 1, and the lifting seat 24 is slidably arranged on the flipping frame 23. The lifting seat 24 has the freedom to move along the height direction of the flipping frame 23. The rotating seat 25 is rotatably arranged on the lifting seat 24. The rotation axis of the rotating seat 25 is vertically arranged. A flipping axis 27 is rotatably arranged on the rotating seat 25. The rotation axis of the flipping axis 27 is perpendicular to the rotation axis of the rotating seat 25. The vacuum beam 26 One end is connected to the flip shaft 27, and the other end is connected to the negative pressure suction cup 28. The suction port of the negative pressure suction cup 28 is set vertically downward. The specific flipping process is: the lifting seat 24 drives the negative pressure suction cup 28 to move close to the circuit board, so that the negative pressure suction cup 28 contacts the circuit board, and the negative pressure suction cup 28 is connected to the negative pressure pump through the air pipe, so as to adsorb the circuit board by negative pressure, and then the lifting seat 24 drives the negative pressure suction cup 28 to move upward, so that the negative pressure suction cup 28 carries the circuit board to the top of the positioning platform 3, so that there is enough space for the circuit board to flip, and then, the flip shaft 27 drives the vacuum beam 26 to flip 180°, so that the negative pressure suction cup 28 drives the circuit board to flip 180°, realizing the flipping operation of the circuit board, finally, the lifting seat 24 drives the negative pressure suction cup 28 to move downward, and puts the circuit board back on the positioning platform 3. After the flipping is completed, it enters the next group of test mechanisms for testing.

Furthermore, a lead screw 29 is rotatably mounted on the flip frame 23, the lifting seat 24 is threadedly mounted on the lead screw 29, a lead screw motor 30 is mounted on the flip frame 23, and the output shaft of the lead screw motor 30 is connected to the lead screw 29, a first spindle 31 is fixed to the bottom of the rotating seat 25, the first spindle 31 is rotatably connected to the lifting seat 24, a first motor 32 is mounted at the bottom of the lifting seat 24, and the output shaft of the first motor 32 is connected to the first spindle 31, a second motor 33 is mounted on the top of the rotating seat 25, and the output shaft of the second motor 33 is connected to the first spindle 31. The flip shaft 27 is connected through a bevel gear set, that is, an inner cavity is set in the rotating seat 25, the output shaft of the second motor 33 penetrates into the inner cavity and is connected to the first bevel gear, the flip shaft 27 penetrates into the inner cavity and is connected to the second bevel gear, the second bevel gear meshes with the first bevel gear, the screw motor 30 drives the screw 29 to rotate, so that the lifting seat 24 makes a linear motion along the axial direction of the screw 29, and the second motor 33 drives the flip shaft 27 to rotate through the bevel gear set, so that the vacuum beam 26 can be flipped 180°, thereby completing the flipping operation of the circuit board.

Embodiment 6: Since the vacuum beam 26 and the negative pressure suction cup 28 deflect together with the circuit board, the flipped circuit board is located above the negative pressure suction cup 28. In the process of flipping the circuit board and placing it on the positioning platform 3 again, the vacuum beam 26 will interfere with the positioning platform 3. Therefore, in order to ensure that the circuit board can be smoothly placed on the positioning platform 3 after flipping, on the basis of Embodiment 5, as shown in Figures 1 to 5, the positioning platform 3 and the support platform 14 are both provided with avoidance windows 34 along the moving direction of the lifting seat 24, and the bottom of the support platform 14 is provided with a vertical plate 3. 5 is connected to the disc-shaped test table 2, which is used to form a rotation space between the support platform 14 and the disc-shaped test table 2. After the vacuum beam 26 flips the circuit board, it passes through the avoidance window 34 and moves into the rotation space, and deflects in the rotation space to avoid the positioning fixture mechanism and reset. The size of the vacuum beam 26 and the size of the negative pressure suction cup 28 are both smaller than the size of the circuit board. The vacuum beam 26 and the circuit board thereon are driven downward by the lifting seat 24. The vacuum beam 26 and the negative pressure suction cup 28 can smoothly pass through the avoidance window 34, while the circuit board cannot pass through the avoidance window 34, so that when switching the vacuum beam 26, the vacuum beam 26 and the negative pressure suction cup 28 can pass through the avoidance window 34. After the vacuum beam 26 has a negative pressure circuit, the circuit board remains on the positioning platform 3. The negative pressure generated by the negative pressure hole 21 re-installs the circuit board on the positioning platform 3. When the vacuum beam 26 moves into the rotation space, the first motor 32 drives the rotating seat 25 to deflect horizontally, and the rotating seat 25 drives the vacuum beam 26 to deflect horizontally, so that the vacuum beam 26 moves to the outside of the positioning fixture mechanism. Then, the lifting seat 24 drives the vacuum beam 26 to move upward, so that the vacuum beam 26 moves to the top of the positioning fixture mechanism. Then, the rotating seat 25 drives the vacuum beam 26 to rotate. Finally, After that, the vacuum beam 26 rotates, thereby resetting the vacuum beam 26 and continuing to flip the next circuit board, so that the flipping mechanism can smoothly avoid resetting the positioning fixture mechanism while realizing the flipping of the circuit board, and there will be no interference; in specific implementation, when the vacuum beam 26 moves to the outside of the positioning fixture mechanism, the return of the lifting seat 24, the rotation of the rotating seat 25 and the rotation of the vacuum beam 26 can be carried out simultaneously to improve the resetting efficiency. Note that during the rotation of the rotating seat 25, it is necessary to avoid interference between the vacuum beam 26 and the positioning fixture mechanism.

Embodiment 7: On the basis of Embodiment 6, as shown in Figures 1, 4 and 5, a loading and unloading mechanism is provided on the workbench 1, and the loading and unloading mechanism is used to take out the tested circuit board from the positioning fixture mechanism, and the loading and unloading mechanism includes a linear drive module 43, a loading and unloading base 44 and a negative pressure loading and unloading suction cup 45, the top of the loading and unloading base 44 is rotatably connected with a loading and unloading mounting plate 46, the linear drive module 43 is vertically mounted on the loading and unloading mounting plate 46, the sliding seat of the linear drive module 43 is connected with a loading and unloading beam 47, the negative pressure loading and unloading suction cup 45 is mounted on the loading and unloading beam 47, a loading and unloading motor 48 is installed on the loading and unloading base 44, and the output shaft of the loading and unloading motor 48 is drivingly connected to the loading and unloading mounting plate 46. In specific implementation, conveyor belts are provided on both sides of the loading and unloading mechanism, and qualified products and unqualified products are respectively conveyed to the two conveyor belts through the loading and unloading mechanism. The specific unloading process is: when unqualified products are tested, the circuit board will no longer undergo subsequent testing, and when passing through subsequent workstations, the corresponding workstations The mechanism in the position is in an empty running turntable, for example: when the front side of the circuit board is detected to be unqualified, the flipping mechanism and the subsequent testing mechanism do not operate the circuit board. At this time, the circuit board runs to the loading and unloading mechanism, and the negative pressure unloading suction cup 45 is driven by the linear drive module 43 to adsorb the circuit board, and then the unloading motor 48 drives the unloading mounting plate 46 to rotate, and the unloading mounting plate 46 drives the linear drive module 43 and the negative pressure unloading suction cup 45 to rotate, so that the circuit board is placed on a conveyor belt, and the unqualified products are transported to the designated position through the conveyor belt, and the qualified products are placed on another conveyor belt, so as to achieve the effect of classified unloading, and the degree of automation is high; a group of loading and unloading mechanisms and conveyor belts are configured at the automatic loading mechanism, and the circuit board to be tested is transported to the working range of the loading and unloading mechanism through the conveyor belt, and then the circuit board is clamped by the loading and unloading mechanism, and the circuit board is placed on the support plate 7 from the top of the hollow loading box 6, thereby realizing automated production.

To sum up, the entire testing process is as follows: the circuit board to be tested is loaded onto the positioning fixture mechanism through the automatic loading mechanism, the positioning fixture mechanism and the circuit board are positioned, and then the front side of the circuit board is tested by the first group of testing mechanisms, and then the circuit board is turned over by the flipping mechanism, and then the back side of the circuit board is tested by the second group of testing mechanisms. After the test is completed, the unqualified circuit boards are output to one conveyor belt through the loading and unloading mechanisms, and the qualified circuit boards are conveyed to another conveyor belt, and this cycle is repeated to realize automated testing.

Claims (10)

1. A circuit board testing device based on mechanical positioning, characterized in that it comprises a workbench (1), an automatic feeding mechanism arranged on the workbench (1), and a disc-shaped test table (2) rotatably arranged on the workbench (1), a plurality of positioning fixture mechanisms evenly arranged on the disc-shaped test table (2) around its own circumferential direction, the positioning fixture mechanism comprising a positioning platform (3) and a vibration mechanism, an end surface positioning block (4) and a side surface positioning block (5) are fixed on the top of the positioning platform (3), the end surface positioning block (4) and the side surface positioning block (5) are connected at a right angle to form a right angle positioning piece, the vibration mechanism is arranged below the positioning platform (3), the vibration mechanism is used to make the positioning platform (3) vibrate, the positioning platform (3) has a deflection degree of freedom, the deflection axis of the positioning platform (3) is perpendicular to the diagonal of the right angle positioning piece, the positioning platform (3) has two states, when positioning, the positioning platform (3) deflects so that the right angle positioning piece is in a low end position; when testing, the positioning platform (3) is in a horizontal state; The automatic feeding mechanism comprises a hollow feeding box (6) and a conveying mechanism. Two groups of the conveying mechanisms are symmetrically arranged in the hollow feeding box (6). The conveying mechanism comprises an annular conveying line and a support plate (7). A conveying cavity (8) is formed between the inner wall and the outer wall of the hollow feeding box (6). The annular conveying line is arranged in the conveying cavity (8). A plurality of support plates (7) are arranged at equal intervals along the conveying direction on the annular conveying line. A vertical slide groove (9) is provided through the inner wall of the hollow feeding box (6) along its own height direction. The vertical slide groove (9) is connected to the conveying cavity (8). The support plate (7) passes through the vertical slide groove (9) into the hollow feeding box (6). 2. A circuit board testing device based on mechanical positioning according to claim 1, characterized in that the annular conveyor line comprises a rotatably mounted driving pulley (10) and a driven pulley (11), the driving pulley (10) and the driven pulley (11) are spaced apart along the height direction of the hollow loading box (6), the driving pulley (10) is connected to the driven pulley (11) through a conveying belt (12), the support plate (7) is installed on the conveying belt (12), a conveying motor (13) is installed on the outer wall of the hollow loading box (6), and the output shaft of the conveying motor (13) is connected to the driving pulley (10). 3. A circuit board testing device based on mechanical positioning according to claim 1, characterized in that the positioning fixture mechanism also includes a support platform (14), the support platform (14) is fixedly mounted on the disc-shaped test bench (2), a ball joint support column (15) is fixed on the top of the disc-shaped test bench (2), the central ball of the positioning platform (3) is hinged on the ball joint support column (15), the four corners of the bottom of the positioning platform (3) are connected to springs (16), the springs (16) are connected to the support platform (14), two groups of positioning cylinders (17) are installed on the support platform (14), and the two groups of positioning cylinders (17) are arranged at intervals along the diagonal of the right-angle positioning piece. 4. A circuit board testing device based on mechanical positioning according to claim 3, characterized in that a blowing cavity (18) and an adsorption cavity (19) are arranged at intervals in the horizontal direction in the positioning platform (3), and a plurality of blowing holes (20) and negative pressure holes (21) are evenly opened on the top surface of the positioning platform (3), and the blowing holes (20) and the negative pressure holes (21) are respectively connected to the blowing cavity (18) and the adsorption cavity (19), and the blowing holes (20) are opened obliquely toward the diagonal line of the right-angle positioning piece, and the vibration mechanism adopts an exciter (22), and the exciter (22) is installed on the supporting platform (14), and the vibration axis of the exciter (22) contacts the positioning platform (3). 5. A circuit board testing device based on mechanical positioning according to claim 3, characterized in that a flip mechanism is arranged on the workbench (1), the flip mechanism is located on the rotation path of the positioning fixture mechanism, the flip mechanism comprises a flip frame (23), a lifting seat (24), a rotating seat (25) and a vacuum beam (26), the flip frame (23) is installed on the workbench (1), the lifting seat (24) is slidably arranged on the flip frame (23), and the lifting seat (24) has a rotation path along the The turning frame (23) has a degree of freedom of movement in the height direction, the rotating seat (25) is rotatably arranged on the lifting seat (24), the rotation axis of the rotating seat (25) is vertically arranged, a turning shaft (27) is rotatably arranged on the rotating seat (25), the rotation axis of the turning shaft (27) is perpendicular to the rotation axis of the rotating seat (25), one end of the vacuum beam (26) is connected to the turning shaft (27), and the other end is connected to a negative pressure suction cup (28), and the adsorption port of the negative pressure suction cup (28) is vertically arranged downward. 6. A circuit board testing device based on mechanical positioning according to claim 5, characterized in that a lead screw (29) is rotatably mounted on the flip frame (23), the lifting seat (24) is threadedly mounted on the lead screw (29), a lead screw motor (30) is mounted on the flip frame (23), the output shaft of the lead screw motor (30) is drivingly connected to the lead screw (29), a first main shaft (31) is fixed at the bottom of the rotating seat (25), the first main shaft (31) is rotatably connected to the lifting seat (24), a first motor (32) is mounted at the bottom of the lifting seat (24), the output shaft of the first motor (32) is drivingly connected to the first main shaft (31), a second motor (33) is mounted on the top of the rotating seat (25), and the output shaft of the second motor (33) is drivingly connected to the flip shaft (27) through a bevel gear set. 7. A circuit board testing device based on mechanical positioning according to claim 6, characterized in that the positioning platform (3) and the supporting platform (14) are both provided with avoidance windows (34) along the moving direction of the lifting seat (24), and the bottom of the supporting platform (14) is connected to the disc-shaped test table (2) through a vertical plate (35) to form a rotation space between the supporting platform (14) and the disc-shaped test table (2), and the vacuum beam (26) flips the circuit board and passes through the avoidance window (34) to move into the rotation space, and deflects in the rotation space to avoid the positioning fixture mechanism and reset. 8. A circuit board testing device based on mechanical positioning according to claim 5, characterized in that two groups of test mechanisms are arranged on the workbench (1), the flip mechanism is located between the two groups of the test mechanisms, the test mechanisms include a test lifting seat (36), a test switching board (37), a test box (38) and an industrial camera (39), the test lifting seat (36) has the freedom to move along the axial direction of the disc-shaped test table (2), the test switching board (37) is rotatably mounted on the test lifting seat (36), the deflection axis of the test switching board (37) is parallel to the axis of the disc-shaped test table (2), the test box (38) and the industrial camera (39) are respectively installed at the bottom of both ends of the test switching board (37), a test circuit board is arranged in the test box (38), and a test probe is arranged on the test circuit board, and the test probe matches the test hole on the circuit board. 9. A circuit board testing device based on mechanical positioning according to claim 5, characterized in that the testing mechanism further comprises a lifting cylinder (40), the cylinder body of the lifting cylinder (40) is installed on the workbench (1), the telescopic shaft of the lifting cylinder (40) is connected to the test lifting seat (36), the center of the test switching plate (37) is connected to a switching shaft (41), the switching shaft (41) is rotatably connected to the test lifting seat (36), a switching motor (42) is installed at the bottom of the test lifting seat (36), and the output shaft of the switching motor (42) is transmission-connected to the switching shaft (41). 10. A circuit board testing device based on mechanical positioning according to claim 1, characterized in that a loading and unloading mechanism is provided on the workbench (1), and the loading and unloading mechanism is used to remove the tested circuit board from the positioning fixture mechanism, and the loading and unloading mechanism comprises a linear drive module (43), a material unloading base (44) and a negative pressure material unloading suction cup (45), the top of the material unloading base (44) is rotatably connected to a material unloading mounting plate (46), the linear drive module (43) is vertically mounted on the material unloading mounting plate (46), the sliding seat of the linear drive module (43) is connected to a material unloading beam (47), the negative pressure material unloading suction cup (45) is mounted on the material unloading beam (47), and a material unloading motor (48) is installed on the material unloading machine base (44), and the output shaft of the material unloading motor (48) is drivingly connected to the material unloading mounting plate (46).