PCB (Printed Circuit Board) test fixture

Abstract

The utility model discloses a PCB (printed circuit board) test fixture, which comprises a test board and an adjustable test mechanism, a mounting cavity is formed inside the test board, a needle bed and a fixing frame are arranged on the test board, a pressing mechanism is movably connected onto the fixing frame, and the tail end of the pressing mechanism is connected with a pressing plate aligned with the needle bed; the adjustable testing mechanism comprises a main control circuit board, an adjusting assembly and an indicating circuit board, the main control circuit board is arranged in the mounting cavity, the needle bed is electrically connected to the main control circuit board, and the adjusting assembly and the indicating circuit board are both arranged on the outer surface of the testing table and electrically connected to the main control circuit board so as to adjust and observe testing voltage or current on the needle bed. According to the technical scheme of the utility model, the range of the connected voltage or current can be adjusted when the PCB is tested, and more comprehensive testing can be carried out on the PCB.

Description

Technical Field

[0001] The utility model relates to the technical field of test fixtures, and particularly relates to a PCB board test fixture. Background Art

[0002] In the process of PCB production and manufacturing, an essential process is to detect the assembled PCB according to its functions and manufacturability, so as to identify short circuits, open circuits, misplacement of components or faulty components on the board. Currently, the detection of PCB boards is carried out by connecting rated voltage or rated current to the components on the board for detection. However, during the actual operation of the PCB board, the working voltage and working current may not always remain at the rated standard, and there is a lack of detection for the possible fluctuations in voltage and current during the PCB board detection process, nor is there a corresponding test device for this detection. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide a PCB board test fixture, aiming to be able to adjust the range of voltage or current connected during the test of the PCB board and conduct a more comprehensive test on the PCB board.

[0004] To achieve the above purpose, a PCB board test fixture proposed by the utility model includes:

[0005] A test bench, an installation cavity is formed inside the test bench, a needle bed and a fixing frame are arranged on the test bench, a pressing mechanism is movably connected to the fixing frame, and a pressing plate aligned with the needle bed is connected to the end of the pressing mechanism.

[0006] An adjustable test mechanism, the adjustable test mechanism includes a main control circuit board, an adjustment component and an indication circuit board. The main control circuit board is arranged in the installation cavity, the needle bed is electrically connected to the main control circuit board, and both the adjustment component and the indication circuit board are arranged on the outer surface of the test bench and electrically connected to the main control circuit board to adjust and observe the test voltage or current on the needle bed.

[0007] In an embodiment of the utility model, the pressing mechanism includes a mounting seat, an operating handle, a pressing rod and two connecting pieces. The mounting seat is connected to the fixing frame, a connecting portion is provided on the surface of the mounting seat, a bending portion is formed at the end of the operating handle, the end of the bending portion is rotatably connected to the connecting portion, and one ends of the two connecting pieces are rotatably connected to the bending portion, and the other ends are rotatably connected to the end of the pressing rod.

[0008] In an embodiment of the utility model, a plurality of guide columns are vertically arranged between the fixing frame and the surface of the test bench, and a plurality of through holes are formed on the pressing plate, and the through holes are sleeved on the guide columns.

[0009] In an embodiment of the present utility model, a plurality of adjusting knobs are arranged on the outer surface of the test bench, and the plurality of adjusting knobs are all electrically connected to the main control circuit board to form the adjusting assembly.

[0010] In an embodiment of the present utility model, a plurality of indicator lights are connected to the indicator circuit board.

[0011] In an embodiment of the present utility model, the adjustable test mechanism further includes a voltmeter and an ammeter electrically connected to the main control circuit board, and the voltmeter and the ammeter are both attached to the side surface of the fixing bracket.

[0012] In an embodiment of the present utility model, a plurality of pressing needles protrude from the surface of the pressing plate facing the pin bed.

[0013] The technical solution of the present utility model sets an adjustable test mechanism on the test bench, including a main control circuit board, an adjusting assembly and an indicator circuit board. By controlling the main control circuit board through the adjusting assembly to change the values of the test voltage and current, the indicator circuit board can view the test results, and the working state of the PCB board under voltage or current fluctuations can be observed, so that a more comprehensive test of the PCB board is carried out. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0015] Figure 1 It is a schematic structural diagram of the present utility model;

[0016] Figure 2 It is a schematic structural diagram of the present utility model;

[0017] Figure 3 It is an exploded schematic diagram of the present utility model;

[0018] Figure 4 It is Figure 3 The partial enlarged view of part A in

[0019] Explanation of the reference numerals in the drawings:

[0020] 1. Test bench; 2. Installation cavity; 3. Pin bed; 4. Fixing frame; 41. Guide post; 5. Pressing mechanism; 51. Mounting seat; 511. Connecting part; 52. Operating handle; 521. Bent part; 53. Pressing rod; 54. Connecting piece; 55. Pressing plate; 551. Through hole; 552. Pressing pin; 6. Adjustable test mechanism; 61. Main control circuit board; 62. Adjusting component; 621. Adjusting knob; 63. Indicator circuit board; 631. Indicator lamp; 64. Voltmeter; 65. Ammeter.

[0021] The realization, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0022] In order to make the purpose, technical solutions and advantages of the present application clearer, the following further details the present application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] Referring to Figures 1 to 4 , the present utility model provides a PCB board test fixture, which includes a test bench 1 and an adjustable test mechanism 6. An installation cavity 2 is formed inside the test bench 1. A pin bed 3 and a fixing frame 4 are arranged on the test bench 1. A pressing mechanism 5 is movably connected to the fixing frame 4, and a pressing plate 55 aligned with the pin bed 3 is connected to the end of the pressing mechanism 5. The adjustable test mechanism 6 includes a main control circuit board 61, an adjusting component 62 and an indicator circuit board 63. The main control circuit board 61 is arranged in the installation cavity 2, the pin bed 3 is electrically connected to the main control circuit board 61, and both the adjusting component 62 and the indicator circuit board 63 are arranged on the outer surface of the test bench 1 and electrically connected to the main control circuit board 61 to adjust and observe the test voltage or current on the pin bed 3.

[0024] Understandably, the bed-of-nails 3 test is a way to test a PCB board. The edge of the bed-of-nails 3 fits with the PCB board, which can limit the position of the PCB board placed in the bed-of-nails 3. At the same time, there are many probes in the bed-of-nails 3, and the probes can contact each detection point on the PCB board to perform detection. A pressing mechanism 5 is installed on the fixing frame 4, which can be a hydraulic device, a pneumatic device, an electric telescopic rod or other devices. The pressing mechanism 5 is connected with a pressing plate 55 aligned with the bed-of-nails 3. When testing, the pressing mechanism 5 can drive the pressing plate 55 to press against the PCB board to ensure good contact between the probes and the detection points. The main control circuit board 61 is arranged in the installation cavity 2. At least a power supply module and an adjustment module are integrated on the main control circuit board 61. The power supply module is used to provide test voltage and test current for the PCB board. The adjustment module can control the voltage and current to change. It can be adjusted by means of a potentiometer, a linear voltage regulator or a voltage transformation circuit, etc., which will not be elaborated further here. The adjustment component 62 is outside the test bench 1 and is electrically connected to the adjustment module of the main control circuit board 61. By operating the adjustment component 62, the test voltage and test current can be adjusted. The indication circuit board 63 is used to observe the test situation of the PCB board. Components such as light-emitting diodes and small LED lights that can observe the test situation are connected to the indication circuit board 63.

[0025] In the adjustable test mechanism 6, the adjustment component 62 controls the main control circuit board 61 to change the values of the test voltage and current. The indication circuit board 63 can then view the test results, be able to observe the working state of the PCB board under voltage or current fluctuations, and conduct a more comprehensive test on the PCB board.

[0026] Refer to Figure 4 In an embodiment of the present application, the pressing mechanism 5 includes a mounting base 51, an operating handle 52, a pressing rod 53 and two connecting pieces 54. The mounting base 51 is connected to the fixing frame 4. A connecting portion 511 is provided on the surface of the mounting base 51. A bending portion 521 is formed at the end of the operating handle 52, and the end of the bending portion 521 is rotatably connected to the connecting portion 511. One end of the two connecting pieces 54 is rotatably connected to the bending portion 521, and the other end is rotatably connected to the end of the pressing rod 53.

[0027] Understandably, when the operating handle 52 is toggled, the bending portion 521 rotates relative to the connecting portion 511, and the bending portion 521 drives the two connecting pieces 54 to move downward. The pressing rod 53 connected to the connecting pieces 54 also moves downward accordingly, causing the pressing plate 55 to press against the PCB board for testing. Compared with the method of using a hydraulic device, a pneumatic device, an electric telescopic rod or other devices to control the pressing plate 55 to move downward, the above structure has lower cost, is more firm in structure, is not easily damaged, has a longer service life, and is also more convenient for maintenance.

[0028] Refer to Figures 2 to 3, in an embodiment of the present application, a plurality of guide posts 41 are vertically arranged between the fixing frame 4 and the surface of the test bench 1. A plurality of through holes 551 are formed in the pressing plate 55, and the through holes 551 are sleeved on the guide posts 41.

[0029] It can be understood that, under the combined action of the guide posts 41 and the through holes 551, the pressing plate 55 can only displace vertically along the guide posts 41 without generating horizontal displacement. The pressing of the pressing plate 55 on the PCB board is relatively stable and will not cause shaking to affect the test.

[0030] Refer to Figure 2 , in an embodiment of the present application, a plurality of adjusting knobs 621 are arranged on the outer surface of the test bench 1 in an array, and the plurality of adjusting knobs 621 are all electrically connected to the main control circuit board 61 to form an adjusting assembly 62.

[0031] It can be understood that the adjusting assembly 62 is a plurality of adjusting knobs 621 arranged in a row, which can adjust the voltage or current at different test points on the PCB board, making the adjustment more flexible and controllable, and the test range of the PCB board becomes larger. The method of using the knob to adjust is also easier to master the degree of adjustment, and a relatively fine adjustment accuracy can be achieved.

[0032] Refer to Figure 3 , in an embodiment of the present application, a plurality of indicator lights 631 are connected to the indicator circuit board 63.

[0033] It can be understood that the setting of the indicator lights 631 can facilitate the observation of the test results of the PCB board. The plurality of indicator lights 631 can correspond to a plurality of different test points. By observing the on and off states of the indicator lights 631, the working conditions of multiple points can be tested more intuitively, making the test process more simple and efficient.

[0034] Refer to Figure 3 , in an embodiment of the present application, the adjustable test mechanism 6 further includes a voltmeter 64 and an ammeter 65 electrically connected to the main control circuit board 61, and the voltmeter 64 and the ammeter 65 are both attached to the side surface of the fixing frame 4.

[0035] It can be understood that the values of the current test voltage and test current can be directly read through the voltmeter 64 and the ammeter 65. On the one hand, it is convenient for users to adjust the test voltage and test current, making the adjustment process more flexible. On the other hand, it is also convenient to record the test data of the PCB board. For example, when a certain circuit cannot conduct, the current voltage and current data can be recorded through the voltmeter 64 and the ammeter 65 for subsequent improvement.

[0036] Refer to Figure 1 , in an embodiment of the present application, a plurality of pressing pins 552 protrude from the surface of the pressing plate 55 facing the needle bed 3.

[0037] Understandably, the position of the pressure needle 552 corresponds to multiple test points on the PCB board. When the pressing plate 55 moves downward, the pressure needle 552 will press against the test points on the PCB board, making the contact between the test points and the needle bed 3 closer and avoiding poor contact that may affect the test.

[0038] The technical solution of the present utility model sets an adjustable test mechanism 6 on the test bench 1, including a main control circuit board 61, an adjustment component 62, and an indication circuit board 63. The main control circuit board 61 is controlled by the adjustment component 62 to change the values of the test voltage and current, and the indication circuit board 63 can view the test results, enabling the working state of the PCB board under voltage or current fluctuations to be observed, and a more comprehensive test of the PCB board is carried out.

[0039] In the attached drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the attached drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the attached drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] The above is only the preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A PCB board test fixture, characterized in that: include A test bench (1), wherein a mounting cavity (2) is formed inside the test bench (1), a needle bed (3) and a fixing frame (4) are arranged on the test bench (1), a pressing mechanism (5) is movably connected to the fixing frame (4), and a pressing plate (55) aligned with the needle bed (3) is connected to the end of the pressing mechanism (5); An adjustable test mechanism (6), the adjustable test mechanism (6) comprising a main control circuit board (61), an adjustment component (62) and an indication circuit board (63), the main control circuit board (61) being arranged in the installation cavity (2), the needle bed (3) being electrically connected to the main control circuit board (61), the adjustment component (62) and the indication circuit board (63) being both arranged on the outer surface of the test bench (1) and electrically connected to the main control circuit board (61), so as to adjust and observe the test voltage or current on the needle bed (3).

2. The PCB board test fixture according to claim 1, characterized in that: The pressing mechanism (5) comprises a mounting seat (51), an operating handle (52), a pressing rod (53) and two connecting members (54); the mounting seat (51) is connected to the fixing frame (4); a connecting portion (511) is provided on the surface of the mounting seat (51); a bending portion (521) is formed at the end of the operating handle (52); the end of the bending portion (521) is rotatably connected to the connecting portion (511); one end of the two connecting members (54) is rotatably connected to the bending portion (521), and the other end is rotatably connected to the end of the pressing rod (53).

3. The PCB board test fixture according to claim 2, characterized in that: A plurality of guide columns (41) are vertically arranged between the fixing frame (4) and the surface of the test bench (1), a plurality of through holes (551) are opened on the pressing plate (55), and the through holes (551) are sleeved on the guide columns (41).

4. The PCB board test fixture according to claim 1, characterized in that: A plurality of adjusting knobs (621) are arranged on the outer surface of the test bench (1), and the plurality of adjusting knobs (621) are all electrically connected to the main control circuit board (61) to form the adjusting component (62).

5. The PCB board test fixture according to claim 1, characterized in that: The indicating circuit board (63) is connected to a plurality of indicating lights (631).

6. The PCB board test fixture according to claim 1, characterized in that: The adjustable testing mechanism (6) further comprises a voltmeter (64) and an ammeter (65) electrically connected to the main control circuit board (61); the voltmeter (64) and the ammeter (65) are both arranged in close contact with the side of the fixing frame (4).

7. The PCB board test fixture according to any one of claims 1 to 6, characterized in that: A plurality of pressing needles (552) are protrudingly provided on one side of the pressing plate (55) facing the needle bed (3).

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