Testing Equipment and Testing Method for Printed Circuit Board of Intelligent Transportation Sensor

Abstract

The present invention discloses a testing device and a testing method for a printed circuit board of an intelligent transportation sensor, which relates to the technical field of printed circuit board manufacturing. The device includes a PCB testing fixture. A housing is fixedly arranged on the left side of the PCB testing fixture. A driving mechanism is arranged on the right side inside the housing. Loading and unloading mechanisms are fixedly arranged on both sides of the driving mechanism. A positioning mechanism is arranged on the left side inside the PCB testing fixture. A triggering mechanism is arranged behind the positioning mechanism. A traction mechanism is arranged on the left side at the top of the PCB testing fixture. The present invention can realize loading and unloading outside the fixture. While the loading and unloading are more convenient, the standby time of the PCB testing fixture can be shortened. At the same time, the positioning operation of the printed circuit board can be automatically and accurately completed without manual positioning, further reducing the testing difficulty and effectively improving the testing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of printed circuit board manufacturing, and particularly relates to a test device and a test method for a printed circuit board of an intelligent transportation sensor. Background Art

[0002] Autopilot is a very important part of the intelligent transportation field. In order to achieve autopilot, various sensors used in the transportation field are essential. In the processing of the above-mentioned sensor printed circuit board, multiple process steps are involved, such as blanking, inner layer production, lamination, drilling, electroless copper plating, outer layer production, surface coating, and shape processing. After each process step is completed, corresponding inspections are required to ensure the quality of each process step is qualified. After the printed circuit board is manufactured, its electrical performance also needs to be tested. This kind of test can be carried out by placing the PCB in a test fixture and pressing the contact points of the test probes on the PCB circuit traces on the PCB.

[0003] The invention patent with the publication number CN 101632027 B discloses a test fixture and method for circuit board testing. The printed circuit board test fixture includes: a flexure sensor for monitoring the flexure or twist of the PCB during the test; the PCB is located above an irregular test probe array; the test probes are aligned with the electrical test points on the PCB; then the PCB is pressed down onto the test probes through an irregular push rod array; the positions of the push rods are usually specified by the PCB manufacturer to avoid printed circuit board components, and the positions of the test probes are usually also specified by the PCB manufacturer to obtain the desired signals.

[0004] However, there are still some disadvantages in the actual use of the above device. The more obvious one is that when placing the printed circuit board in the support plate groove, in order to enable the test probes to accurately test the printed circuit board, the printed circuit board needs to be positioned. For the convenience of placement, the size of the support plate groove is usually larger than the size of the printed circuit board. Therefore, direct positioning cannot be achieved through the support plate groove, and only the manual adjustment and positioning method can be used. This not only has a large operation difficulty but also cannot guarantee the positioning accuracy.

[0005] In addition, after the test is completed, the technician needs to take out the printed circuit board from the support plate groove and then re-insert the printed circuit board to be tested. Therefore, for the convenience of the technician's operation, both the push plate and the flexure sensor plate need to be raised to a relatively high position, and then need to be lowered a long distance again during the subsequent test, resulting in a long time consumption for the overall feeding and unloading process, which has a great impact on the test efficiency of the printed circuit board.

[0006] Therefore, it is very necessary to invent a test device and a test method for a printed circuit board of an intelligent transportation sensor to solve the above problems. Summary of the Invention

[0007] The object of the present invention is to provide a test device and a test method for a printed circuit board of an intelligent transportation sensor, so as to solve the problems proposed in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: A test device for a printed circuit board of an intelligent transportation sensor, including a PCB test fixture. A housing is fixedly arranged on the left side of the PCB test fixture. A driving mechanism is arranged on the right side inside the housing. Mounting mechanisms are fixedly arranged on both sides of the driving mechanism. A positioning mechanism is arranged on the left side inside the PCB test fixture. A triggering mechanism is arranged behind the positioning mechanism. A traction mechanism is arranged on the left side at the top of the PCB test fixture. The driving mechanism drives the two mounting mechanisms to rotate and exchange positions. The mounting mechanisms carry the printed circuit board. When the limiting block in the positioning mechanism is pushed downward, it drives the second telescopic rod in the positioning mechanism to descend, and then pushes the rotating plate in the positioning mechanism, so that the traction rod in the traction mechanism rises and enters the inner side of the pull ring in the mounting mechanism. When the second telescopic rod in the positioning mechanism descends, it synchronously drives the lifting block in the triggering mechanism to descend, and then pulls the push rod in the triggering mechanism, so that the push rod pushes the traction rod, thereby driving the pull ring to move by the traction rod.

[0009] Preferably, the driving mechanism includes a first mounting plate, a driving motor, a first telescopic rod and a cross plate;

[0010] The first mounting plate is fixedly arranged on the left side of the PCB test fixture and inside the housing. The driving motor is fixedly arranged at the bottom of the first mounting plate. The first telescopic rod is located at the top of the first mounting plate and is in transmission connection with the driving motor. The cross plate is fixedly arranged at the top of the first telescopic rod.

[0011] Preferably, the mounting mechanism includes a mounting plate, a test through groove, a first L-shaped positioning plate, a second L-shaped positioning plate, a first fixing plate, a moving rod, a first return spring, a pull ring and a limiting plate;

[0012] The mounting plate is fixedly arranged at the end of the cross plate. The test through groove is opened at the center of the top of the mounting plate. The first L-shaped positioning plate is fixedly arranged at one corner of the top of the mounting plate. The second L-shaped positioning plate is slidably arranged at the other corner of the top of the mounting plate. The first fixing plate is located outside the second L-shaped positioning plate and is fixedly connected with the mounting plate. The moving rod penetrates through the first fixing plate and is slidably connected with the first fixing plate. The first return spring is sleeved outside the moving rod. One end of the moving rod is fixedly connected with the second L-shaped positioning plate and the other end is fixedly connected with the pull ring. The limiting plate is fixedly arranged on the side of the mounting plate away from the cross plate.

[0013] Preferably, the positioning mechanism includes a second telescopic rod, a limiting block, a rotating plate and a second mounting plate;

[0014] The second telescopic rod is vertically arranged through the top of the housing and extends into the housing, and the second telescopic rod is slidably connected to the housing. A fourth return spring is arranged inside both the second telescopic rod and the first telescopic rod. There are two limiting blocks and two second mounting plates. The two limiting blocks are respectively fixedly arranged at the top of the front and the top of the back of the second telescopic rod. The rotating plate is located at the bottom of the second telescopic rod and contacts the second telescopic rod. The two second mounting plates are respectively located on both sides of the rotating plate and are fixedly connected to the inner wall of the housing. The rotating plate is rotatably connected to the two second mounting plates through a pin shaft.

[0015] Preferably, the triggering mechanism includes an outer sleeve, a push rod, a slider, a guide plate, a triggering rope, a guide tube, a lifting block and a second return spring;

[0016] The outer sleeve is fixedly connected to the inner wall of the housing. The push rod is slidably arranged inside the outer sleeve. The slider is slidably nested on one side of the outer sleeve and is fixedly connected to the push rod. The guide plate is fixedly arranged on the side of the outer sleeve. One end of the triggering rope is fixedly connected to the slider, and the other end passes through the push rod, the guide tube and is fixedly connected to the lifting block. The guide tube is fixedly connected to the inner wall of the housing. The lifting block is slidably nested on the inner wall of the housing in the vertical direction, and the lifting block is sleeved on the outside of the inner rod of the second telescopic rod. The second return spring is fixedly arranged on the left side of the bottom of the lifting block.

[0017] Preferably, the traction mechanism includes a second fixing plate, a reset rod, a third return spring, a slideway and a traction rod;

[0018] The second fixing plate is fixedly arranged on the top of the housing. The reset rod passes through the second fixing plate and is slidably connected to the second fixing plate. The third return spring is sleeved on the outside of the reset rod, and one end of it is fixedly connected to the reset rod and the other end is slidably nested on the surface of the second fixing plate. The slideway is opened on the top of the housing. The traction rod is slidably arranged inside the slideway and is fixedly connected to the front end of the reset rod. The bottom end of the traction rod contacts the rotating plate.

[0019] The present invention also provides a testing method for a printed circuit board of a smart traffic sensor, which is realized by using the above-mentioned testing equipment for a printed circuit board of a smart traffic sensor. The testing method specifically includes the following steps:

[0020] S1. In the initial state, both loading mechanisms are at the high position. At this time, the technician can pull the pull ring in the left loading mechanism, so that the second L-shaped positioning plate slides away from the first L-shaped positioning plate. Then, place the first printed circuit board between the first L-shaped positioning plate and the second L-shaped positioning plate. Then release the hand. At this time, under the action of the first return spring, the second L-shaped positioning plate resets, and then cooperates with the first L-shaped positioning plate to clamp and position the printed circuit board;

[0021] S2. Make the driving motor drive the first telescopic rod to rotate clockwise by 180 degrees. At this time, the two loading mechanisms are transposed. The original left loading mechanism drives the first printed circuit board to move to the right, and the original right loading mechanism moves to the left;

[0022] S3. Start the PCB test fixture, so that the PCB test fixture starts the test operation. When the test starts, it presses down on the current right loading mechanism, so that the bottom of the first printed circuit board carried on the right loading mechanism contacts the probe on the PCB test fixture, and then the test is completed;

[0023] S4. During the process of the right loading mechanism descending, it drives the left loading mechanism to descend synchronously through the cross plate. When the left loading mechanism descends, it pushes the limit block through the limit plate, so that the second telescopic rod descends synchronously. When the second telescopic rod descends, it presses down on the left side of the rotating plate, so that the left end of the rotating plate descends and the right end rises. At this time, the traction rod is lifted and enters the inner side of the limit plate;

[0024] S5. As the second telescopic rod continues to descend, it begins to press down on the lifting block. During the descent of the lifting block, it compresses the second return spring and pulls the trigger rope at the same time, so that the trigger rope drives the push rod to move through the slider. At this time, the push rod pushes the traction rod, so that the traction rod slides inside the slideway. When the slideway slides, it begins to pull the pull ring, so that the pull ring pulls the second L-shaped positioning plate through the moving rod. When the right loading mechanism no longer descends after reaching the test position, the left loading mechanism also no longer descends. At this time, the first L-shaped positioning plate and the second L-shaped positioning plate are in an open state. Then the technician can place the second printed circuit board between the first L-shaped positioning plate and the second L-shaped positioning plate;

[0025] After the first printed circuit board is tested, the PCB test fixture is opened at this time. The fourth return spring inside the outer rod of the first telescopic rod pushes the inner rod of the first telescopic rod, so that the cross plate drives the two loading mechanisms to rise. At the same time, the second return spring pushes the lifting block, so that the lifting block is reset. In addition, the third return spring pushes the reset rod, so that the reset rod drives the traction rod to reset. When the two loading mechanisms rise to the high position again, the traction rod no longer pulls the left pull ring, and the left loading mechanism completes the clamping of the second printed circuit board.

[0026] S7. Make the drive motor drive the first telescopic rod to rotate counterclockwise by 180 degrees, so as to complete the position exchange of the two loading mechanisms again. At this time, the first printed circuit board is moved out of the PCB test fixture, and the second printed circuit board enters the PCB test fixture. Then, start the PCB test fixture again. After the PCB test fixture is started, the two loading mechanisms are lowered again. During the lowering process of the left loading mechanism, the pull ring is pulled, so that the second L-shaped positioning plate and the first L-shaped positioning plate release the clamping of the first printed circuit board. At this time, the technician can remove the first printed circuit board, then place the third printed circuit board, and repeat the above operations after the second printed circuit board is tested.

[0027] The technical effects and advantages of the present invention:

[0028] By providing a drive mechanism, a loading mechanism, a positioning mechanism, a triggering mechanism and a traction mechanism, the present invention can drive the two loading mechanisms to rise and exchange positions by using the drive mechanism, so as to achieve the effect of convenient loading and unloading. At the same time, there is no need for the push plate and the flexure sensor plate in the PCB test fixture to rise excessively. In addition, when the loading mechanism descends, it can push the positioning mechanism and the triggering mechanism at the same time, so that the triggering mechanism pushes the traction mechanism triggered by the positioning mechanism, and the traction mechanism realizes the opening of the first L-shaped positioning plate and the second L-shaped positioning plate in the loading mechanism, so as to automatically complete positioning and release positioning. Compared with the same type of devices and methods in the prior art, the present invention can realize loading and unloading outside the fixture, making the loading and unloading more convenient, shortening the standby time of the PCB test fixture, and automatically and accurately completing the positioning operation of the printed circuit board without manual positioning, further reducing the test difficulty and effectively improving the test efficiency. Description of the drawings

[0029] Figure 1 It is a schematic diagram of the overall formal structure of the present invention.

[0030] Figure 2 It is a schematic diagram of the front sectional structure of the housing of the present invention.

[0031] Figure 3It is a schematic top view structure diagram of the loading mechanism of the present invention.

[0032] Figure 4 It is a schematic top view structure diagram of the positioning mechanism and the triggering mechanism of the present invention.

[0033] Figure 5 It is a schematic top view structure diagram of the traction mechanism of the present invention.

[0034] In the figure: 1. PCB test fixture; 2. housing; 3. driving mechanism; 31. first mounting plate; 32. driving motor; 33. first telescopic rod; 34. cross plate; 4. loading mechanism; 41. loading plate; 42. test through slot; 43. first L-shaped positioning plate; 44. second L-shaped positioning plate; 45. first fixing plate; 46. moving rod; 47. first return spring; 48. pull ring; 49. limiting plate; 5. positioning mechanism; 51. second telescopic rod; 52. limiting block; 53. rotating plate; 54. second mounting plate; 6. triggering mechanism; 61. outer sleeve; 62. push rod; 63. slider; 64. guiding plate; 65. triggering rope; 66. guiding tube; 67. lifting block; 68. second return spring; 7. traction mechanism; 71. second fixing plate; 72. reset rod; 73. third return spring; 74. slideway; 75. traction rod. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] The present invention provides as Figures 1-5The test equipment of a smart traffic sensor printed circuit board shown in the figure includes a PCB test fixture 1, a shell 2 is fixedly arranged on the left side of the PCB test fixture 1, a driving mechanism 3 is arranged on the right side inside the shell 2, and a carrying mechanism 4 is fixedly arranged on both sides of the driving mechanism 3, a positioning mechanism 5 is arranged on the left side inside the PCB test fixture 1, a trigger mechanism 6 is arranged on the rear side of the positioning mechanism 5, and a traction mechanism 7 is arranged on the left side of the top of the PCB test fixture 1. The driving mechanism 3 drives two carrying mechanisms 4 to rotate and transpose, and the carrying mechanisms 4 are When the printed circuit board is loaded, when the limit block 52 in the positioning mechanism 5 is pushed downward, the second telescopic rod 51 in the positioning mechanism 5 is driven to descend, and then the rotating plate 53 in the positioning mechanism 5 is pushed, so that the traction rod 75 in the traction mechanism 7 rises and enters the inner side of the pull ring 48 in the loading mechanism 4. When the second telescopic rod 51 in the positioning mechanism 5 descends, it simultaneously drives the lifting block 67 in the trigger mechanism 6 to descend, and then pulls the push rod 62 in the trigger mechanism 6, so that the push rod 62 pushes the traction rod 75, so that the traction rod 75 drives the pull ring 48 to move.

[0037] It should also be noted that the PCB test fixture 1 belongs to the existing disclosed technology and is not an essential technical feature of the present application. Therefore, the present application does not elaborate on the specific structure of the PCB test fixture 1.

[0038] like Figure 2 and Figure 3 As shown, the driving mechanism 3 includes a first mounting plate 31 , a driving motor 32 , a first telescopic rod 33 and a transverse plate 34 .

[0039] More specifically, the first mounting plate 31 is fixedly arranged on the left side of the PCB test fixture 1 and is located inside the shell 2, the driving motor 32 is fixedly arranged at the bottom of the first mounting plate 31, the first telescopic rod 33 is located at the top of the first mounting plate 31 and is transmission-connected to the driving motor 32, and the cross plate 34 is fixedly arranged on the top of the first telescopic rod 33, so that when the driving motor 32 drives the first telescopic rod 33 to rotate, the first telescopic rod 33 can drive the two carrying mechanisms 4 to switch positions through the cross plate 34.

[0040] like Figure 3 As shown, the carrying mechanism 4 includes a carrying plate 41, a test slot 42, a first L-shaped positioning plate 43, a second L-shaped positioning plate 44, a first fixing plate 45, a moving rod 46, a first return spring 47, a pull ring 48 and a limit plate 49.

[0041] More specifically, the carrying board 41 is fixedly arranged at the end of the horizontal board 34. The test through groove 42 is opened at the center of the top of the carrying board 41. The first L-shaped positioning board 43 is fixedly arranged at one corner of the top of the carrying board 41. The second L-shaped positioning board 44 is slidably arranged at the other corner of the top of the carrying board 41. The first fixing board 45 is located outside the second L-shaped positioning board 44 and is fixedly connected to the carrying board 41. The moving rod 46 penetrates through the first fixing board 45 and is slidably connected to the first fixing board 45. The first return spring 47 is sleeved outside the moving rod 46. One end of the moving rod 46 is fixedly connected to the second L-shaped positioning board 44 and the other end is fixedly connected to the pull ring 48. The limiting board 49 is fixedly arranged on the side of the carrying board 41 away from the horizontal board 34.

[0042] As Figure 2 shown in Figure 4 Figure, the positioning mechanism 5 includes a second telescopic rod 51, a limiting block 52, a rotating plate 53 and a second mounting plate 54.

[0043] More specifically, the second telescopic rod 51 is arranged vertically through the top of the housing 2 and extends into the housing 2, and the second telescopic rod 51 is slidably connected to the housing 2. Fourth return springs are arranged inside both the second telescopic rod 51 and the first telescopic rod 33. There are two limiting blocks 52 and two second mounting plates 54. The two limiting blocks 52 are respectively fixedly arranged at the top of the front and the top of the back of the second telescopic rod 51. The rotating plate 53 is located at the bottom of the second telescopic rod 51 and contacts the second telescopic rod 51. The two second mounting plates 54 are respectively located on both sides of the rotating plate 53 and are both fixedly connected to the inner wall of the housing 2. The rotating plate 53 is rotatably connected to the two second mounting plates 54 through a pin shaft, so that when the second telescopic rod 51 descends, the left end of the rotating plate 53 can be pushed, and then the right end of the rotating plate 53 rises.

[0044] Meanwhile, the triggering mechanism 6 includes an outer sleeve 61, a push rod 62, a slider 63, a guide plate 64, a triggering rope 65, a guide tube 66, a lifting block 67 and a second return spring 68.

[0045] More specifically, the outer sleeve 61 is fixedly connected to the inner wall of the housing 2. The push rod 62 is slidably arranged inside the outer sleeve 61. The slider 63 is slidably nested on one side of the outer sleeve 61 and fixedly connected to the push rod 62. The guide plate 64 is fixedly arranged on the side surface of the outer sleeve 61. One end of the trigger rope 65 is fixedly connected to the slider 63, and the other end passes through the push rod 62, is fixedly connected to the guide tube 66 and the lifting block 67. The guide tube 66 is fixedly connected to the inner wall of the housing 2. The lifting block 67 is slidably nested on the inner wall of the housing 2 in the vertical direction, and the lifting block 67 is sleeved on the outer side of the inner rod of the second telescopic rod 51. The second return spring 68 is fixedly arranged on the left side of the bottom of the lifting block 67, so that when the lifting block 67 descends, the trigger rope 65 can be pulled, and then the trigger rope 65 can pull the push rod 62 through the slider 63, so that the push rod 62 extends out of the inner part of the outer sleeve 61.

[0046] As Figure 5 shown, the traction mechanism 7 includes a second fixing plate 71, a reset rod 72, a third return spring 73, a slideway 74 and a traction rod 75.

[0047] More specifically, the second fixing plate 71 is fixedly arranged on the top of the housing 2. The reset rod 72 passes through the second fixing plate 71 and is slidably connected to the second fixing plate 71. The third return spring 73 is sleeved on the outer side of the reset rod 72, one end of which is fixedly connected to the reset rod 72, and the other end is slidably nested on the surface of the second fixing plate 71. The slideway 74 is opened on the top of the housing 2. The traction rod 75 is slidably arranged inside the slideway 74 and is fixedly connected to the front end of the reset rod 72. The bottom end of the traction rod 75 contacts the rotating plate 53, so that after the push rod 62 is reset, the third return spring 73 can push the reset rod 72, and then the traction rod 75 is reset.

[0048] The present invention also provides a testing method for a printed circuit board of a smart traffic sensor, which is realized by using the above-mentioned testing device for a printed circuit board of a smart traffic sensor. The testing method specifically includes the following steps:

[0049] S1. In the initial state, both of the two loading mechanisms 4 are in the high position. At this time, the technician can pull the pull ring 48 in the left loading mechanism 4, so that the second L-shaped positioning plate 44 slides in a direction away from the first L-shaped positioning plate 43. Then, the first printed circuit board is placed between the first L-shaped positioning plate 43 and the second L-shaped positioning plate 44. Then, the hand is released. At this time, under the action of the first return spring 47, the second L-shaped positioning plate 44 is reset, and then cooperates with the first L-shaped positioning plate 43 to clamp and position the printed circuit board.

[0050] S2. Rotate the first telescopic rod 33 clockwise by 180 degrees by driving the driving motor 32. At this time, the two loading mechanisms 4 are transposed. The original left loading mechanism 4 drives the first printed circuit board to move to the right, and the original right loading mechanism 4 moves to the left.

[0051] S3. Start the PCB test fixture 1 so that the PCB test fixture 1 starts the test operation. At the beginning of the test, it presses down on the current right loading mechanism 4, so that the bottom of the first printed circuit board carried on the right loading mechanism 4 contacts the probe on the PCB test fixture 1, thus completing the test.

[0052] S4. During the process of the right loading mechanism 4 descending, it drives the left loading mechanism 4 to descend synchronously through the cross plate 34. When the left loading mechanism 4 descends, it pushes the limit block 52 through the limit plate 49, so that the second telescopic rod 51 descends synchronously. When the second telescopic rod 51 descends, it presses down on the left side of the rotating plate 53, so that the left end of the rotating plate 53 descends and the right end rises. At this time, the traction rod 75 is lifted and enters the inside of the limit plate 49.

[0053] S5. As the second telescopic rod 51 continues to descend, it begins to press down on the lifting block 67. During the descent of the lifting block 67, it compresses the second return spring 68 and simultaneously pulls the trigger rope 65, so that the trigger rope 65 drives the push rod 62 to move through the slider 63. At this time, the push rod 62 pushes the traction rod 75, so that the traction rod 75 slides inside the slideway 74. When the slideway 74 slides, it begins to pull the pull ring 48, so that the pull ring 48 pulls the second L-shaped positioning plate 44 through the moving rod 46. When the right loading mechanism 4 no longer descends after reaching the test position, the left loading mechanism 4 also no longer descends. At this time, the first L-shaped positioning plate 43 and the second L-shaped positioning plate 44 are in an open state. Then the technician can place the second printed circuit board between the first L-shaped positioning plate 43 and the second L-shaped positioning plate 44.

[0054] S6. After the test of the first printed circuit board is completed, at this time the PCB test fixture 1 opens. The fourth return spring inside the outer rod of the first telescopic rod 33 pushes the inner rod of the first telescopic rod 33, so that the cross plate 34 drives the two loading mechanisms 4 to rise. At the same time, the second return spring 68 pushes the lifting block 67, so that the lifting block 67 is reset. In addition, the third return spring 73 pushes the reset rod 72, so that the reset rod 72 drives the traction rod 75 to be reset. When the two loading mechanisms 4 rise to the high position again, the traction rod 75 no longer pulls the left pull ring 48, and the left loading mechanism 4 completes the clamping of the second printed circuit board.

[0055] S7. Rotate the first telescopic rod 33 counterclockwise by 180 degrees with the driving motor 32, thereby completing the interchange of the positions of the two carrying mechanisms 4 again. At this time, the first printed circuit board is moved out of the PCB test fixture 1, and the second printed circuit board enters the PCB test fixture 1. Subsequently, start the PCB test fixture 1 again. After the PCB test fixture 1 is started, make the two carrying mechanisms 4 descend again. During the descent of the left carrying mechanism 4, the pull ring 48 is pulled, so that the second L-shaped positioning plate 44 and the first L-shaped positioning plate 43 release the clamping of the first printed circuit board. At this time, the technician can remove the first printed circuit board, then place the third printed circuit board, and repeat the above operations after the second printed circuit board test is completed.

[0056] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A test device for a printed circuit board of an intelligent transportation sensor, characterized in that: It comprises a PCB test fixture, wherein a shell is fixedly arranged on the left side of the PCB test fixture, a driving mechanism is arranged on the right side inside the shell, carrying mechanisms are fixedly arranged on both sides of the driving mechanism, a positioning mechanism is arranged on the left side inside the PCB test fixture, a trigger mechanism is arranged on the rear side of the positioning mechanism, and a traction mechanism is arranged on the left side of the top of the PCB test fixture, the driving mechanism drives two carrying mechanisms to rotate and transpose, the carrying mechanism carries the printed circuit board, when the limit block in the positioning mechanism is pushed downward, the second telescopic rod in the positioning mechanism is driven to descend, and then the rotating plate in the positioning mechanism is pushed, so that the traction rod in the traction mechanism rises and enters the inner side of the pull ring in the carrying mechanism, when the second telescopic rod in the positioning mechanism descends, the lifting block in the trigger mechanism is synchronously driven to descend, and then the push rod in the trigger mechanism is pulled, so that the push rod pushes the traction rod, so that the traction rod drives the pull ring to move; The carrying mechanism includes a carrying plate, a test slot, a first L-shaped positioning plate, a second L-shaped positioning plate, a first fixing plate, a moving rod, a first return spring, a pull ring and a limit plate; The carrying plate is fixedly arranged at the end of the horizontal plate, the test slot is opened at the center of the top of the carrying plate, the first L-shaped positioning plate is fixedly arranged at one corner of the top of the carrying plate, the second L-shaped positioning plate is slidably arranged at the other corner of the top of the carrying plate, the first fixing plate is located on the outside of the second L-shaped positioning plate and is fixedly connected to the carrying plate, the moving rod passes through the first fixing plate and is slidably connected to the first fixing plate, the first return spring is sleeved on the outside of the moving rod, one end of the moving rod is fixedly connected to the second L-shaped positioning plate and the other end is fixedly connected to the pull ring, and the limit plate is fixedly arranged on the side of the carrying plate away from the horizontal plate.

2. The test device for a printed circuit board of an intelligent transportation sensor according to claim 1, characterized in that: The driving mechanism comprises a first mounting plate, a driving motor, a first telescopic rod and a cross plate; The first mounting plate is fixedly arranged on the left side of the PCB test fixture and is located inside the shell, the drive motor is fixedly arranged at the bottom of the first mounting plate, the first telescopic rod is located at the top of the first mounting plate and is transmission-connected to the drive motor, and the cross plate is fixedly arranged on the top of the first telescopic rod.

3. The test device for a printed circuit board of an intelligent transportation sensor according to claim 2, characterized in that: The positioning mechanism includes a second telescopic rod, a limit block, a rotating plate and a second mounting plate; The second telescopic rod is vertically penetrated at the top of the shell and extends into the inside of the shell, and the second telescopic rod is slidably connected to the shell, and a fourth return spring is arranged inside the second telescopic rod and the first telescopic rod, and two limit blocks and two second mounting plates are arranged, and the two limit blocks are respectively fixed at the top of the front side and the top of the back side of the second telescopic rod, and the rotating plate is located at the bottom of the second telescopic rod and contacts with the second telescopic rod, and the two second mounting plates are respectively located on both sides of the rotating plate and are fixedly connected to the inner wall of the shell, and the rotating plate is rotatably connected to the two second mounting plates through a pin shaft.

4. The test device for a printed circuit board of an intelligent transportation sensor according to claim 3, characterized in that: The trigger mechanism includes an outer sleeve, a push rod, a slider, a guide plate, a trigger rope, a guide tube, a lifting block and a second return spring; The outer sleeve is fixedly connected to the inner wall of the housing. The push rod is slidably arranged inside the outer sleeve. The slider is slidably nested on one side of the outer sleeve and fixedly connected to the push rod. The guide plate is fixedly arranged on the side of the outer sleeve. One end of the trigger rope is fixedly connected to the slider, and the other end passes through the push rod, the guide tube and is fixedly connected to the lifting block. The guide tube is fixedly connected to the inner wall of the housing. The lifting block is slidably nested on the inner wall of the housing in the vertical direction, and the lifting block is sleeved on the outer side of the inner rod of the second telescopic rod. The second return spring is fixedly arranged on the left side of the bottom of the lifting block.

5. The testing device for a printed circuit board of an intelligent transportation sensor according to claim 4, characterized in that: The traction mechanism includes a second fixing plate, a return rod, a third return spring, a slideway and a traction rod; The second fixing plate is fixedly arranged on the top of the housing. The return rod passes through the second fixing plate and is slidably connected to the second fixing plate. The third return spring is sleeved on the outer side of the return rod, and one end of it is fixedly connected to the return rod and the other end is slidably nested on the surface of the second fixing plate. The slideway is opened on the top of the housing. The traction rod is slidably arranged inside the slideway and is fixedly connected to the front end of the return rod. The bottom end of the traction rod contacts the rotating plate.

6. A testing method for a printed circuit board of an intelligent transportation sensor, implemented using a testing device for a printed circuit board of an intelligent transportation sensor as described in claim 5, characterized in that, The specific test method includes the following steps: S1. In the initial state, both loading mechanisms are in the high position. At this time, the technician can pull the pull ring in the left loading mechanism, so that the second L-shaped positioning plate slides away from the first L-shaped positioning plate. Then, place the first printed circuit board between the first L-shaped positioning plate and the second L-shaped positioning plate. Then release the hand. At this time, under the action of the first return spring, the second L-shaped positioning plate resets, and then cooperates with the first L-shaped positioning plate to clamp and position the printed circuit board. S2. Make the driving motor drive the first telescopic rod to rotate clockwise by 180 degrees. At this time, the two loading mechanisms are transposed. The original left loading mechanism drives the first printed circuit board to move to the right, and the original right loading mechanism moves to the left. S3. Start the PCB test fixture, so that the PCB test fixture starts the test operation. When the test starts, it presses down on the current right loading mechanism, so that the bottom of the first printed circuit board carried on the right loading mechanism contacts the probe on the PCB test fixture, and then the test is completed. S4. During the descent of the right loading mechanism, it drives the left loading mechanism to descend synchronously through the cross plate. When the left loading mechanism descends, it pushes the limit block through the limit plate, so that the second telescopic rod descends synchronously. When the second telescopic rod descends, it presses down on the left side of the rotating plate, so that the left end of the rotating plate descends and the right end rises. At this time, the traction rod is lifted and enters the inner side of the limit plate. S5. As the second telescopic rod continues to descend, it begins to press down on the lifting block. During the descent of the lifting block, the second return spring is compressed, and at the same time, the trigger rope is pulled, thereby causing the trigger rope to drive the push rod to move through the slider. At this time, the push rod pushes the traction rod, so that the traction rod slides inside the slideway. When the slideway slides, it begins to pull the pull ring, and then the pull ring pulls the second L-shaped positioning plate through the moving rod. When the right-side loading mechanism stops descending after reaching the test position, the left-side loading mechanism also stops descending. At this time, the first L-shaped positioning plate and the second L-shaped positioning plate are in an open state. Subsequently, the technician can place the second printed circuit board between the first L-shaped positioning plate and the second L-shaped positioning plate; S6. After the first printed circuit board is tested, the PCB test fixture is opened at this time. The fourth return spring inside the outer rod of the first telescopic rod pushes the inner rod of the first telescopic rod, so that the cross plate drives the two loading mechanisms to rise. At the same time, the second return spring pushes the lifting block, so that the lifting block returns to its original position. In addition, the third return spring pushes the reset rod, so that the reset rod drives the traction rod to return to its original position. When the two loading mechanisms rise to the high position again, the traction rod no longer pulls the left pull ring, and the left-side loading mechanism completes the clamping of the second printed circuit board; S7. The drive motor is driven to rotate the first telescopic rod counterclockwise by 180 degrees, thereby completing the interchange of the positions of the two loading mechanisms again. At this time, the first printed circuit board is removed from inside the PCB test fixture, and the second printed circuit board enters inside the PCB test fixture. Subsequently, the PCB test fixture is started again. After the PCB test fixture is started, the two loading mechanisms are lowered again. During the descent of the left-side loading mechanism, the pull ring is pulled, so that the second L-shaped positioning plate and the first L-shaped positioning plate release the clamping of the first printed circuit board. At this time, the technician can remove the first printed circuit board, then place the third printed circuit board, and repeat the above operations after the second printed circuit board is tested.

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