Circuit board test fixture

Abstract

The utility model belongs to the field of circuit board jigs, and discloses a circuit board test jig, which comprises a base, a mounting rack mounted at the top, a cylinder mounted at the top of the mounting rack, a control panel mounted at the movable end of the cylinder, and a positioning rod fixed at the bottom of the control panel. A connecting rod is mounted at the top of the pressing plate and slidably inserted into the control plate, a connecting nut sleeves the top of the connecting rod, a probe is mounted at the bottom of the pressing plate, and the bottom edge of the probe is higher than that of the positioning rod; the detection table comprises a shell, a placement table and a clamping mechanism, the shell is installed on the base, a positioning hole is formed in the top face of the shell and matched with the positioning rod, the placement table is installed on the base and located on the inner side of the shell, and the clamping mechanism corresponds to the placement table and is used for clamping the circuit board. Through the pressing plate which is convenient to replace, the position of the probe relative to the pressing plate can be adapted according to the model of the circuit board, so that the device is convenient to detect the circuit boards of different models.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit board fixtures, and in particular relates to a circuit board testing fixture. Background Art

[0002] Circuit boards are important components in the electronics industry. Product quality testing of circuit boards is an essential process in the production of circuit boards, which includes a series of tests such as power-on testing. In order to improve testing efficiency and save manpower, test fixtures are usually used to locate and test circuit boards.

[0003] A Chinese patent with publication number CN219302512U discloses a circuit board test fixture, including a base, a test table connected to the middle of the upper end of the base, grooves are provided at the four corners of the upper end surface of the test table, a placement table is connected to the upper end surface of the test table, and adjustable clamping mechanisms are connected to the left and right sides of the placement table, the upper end of the base is symmetrically connected to side panels, the upper ends of the side panels are connected to a top plate, the lower end of the top plate is symmetrically connected to a fixed shaft, the lower end of the fixed shaft is connected to the base, the upper end of the top plate is connected to a cylinder, the lower end of the cylinder passes through the top plate and is connected to a mounting plate, the lower end of the mounting plate is connected to a movable pressing plate, the outer wall of the pressing plate is connected to a mounting frame, the outer wall of the mounting frame is symmetrically connected to a shaft sleeve mounted on the fixed shaft, and the lower end of the pressing plate is connected to a plurality of positioning mechanisms and probes, and the positioning mechanisms correspond to the grooves; by adjusting the position of the pressing plate left and right, the positioning mechanisms correspond to the grooves, so as to facilitate precise positioning.

[0004] However, in actual use, due to differences in circuit design and size of different circuit boards, the corresponding detection positions also need to be adjusted accordingly, that is, the detection positions of different circuit boards will be different in the horizontal direction, and the above scheme can only control the probe to adjust left and right, which results in the above device being able to detect fewer types of circuit boards, that is, the detection range is small and is not conducive to actual use. Utility Model Content

[0005] The utility model aims to provide a circuit board testing fixture to solve the problem of small detection range in the prior art mentioned above.

[0006] In order to achieve the above object, the utility model provides the following technical solutions: a circuit board test fixture, comprising

[0007] The base has a mounting frame installed on the top, a cylinder is installed on the top of the mounting frame, a control panel is installed on the movable end of the cylinder, and a positioning rod is fixed on the bottom of the control panel;

[0008] A pressure plate, a connecting rod is installed on the top, the connecting rod and the control plate are slidably inserted, a connecting nut is sleeved on the top thread of the connecting rod, the connecting nut is butted against the control plate, a probe is installed on the bottom of the pressure plate, and the bottom edge of the probe is higher than the bottom edge of the positioning rod;

[0009] The testing platform includes a shell, a placement platform and a clamping mechanism. The shell is installed on a base. A positioning hole is opened on the top surface of the shell. The positioning hole is adapted to a positioning rod. The placement platform is installed on the base and is located on the inner side of the shell. The clamping mechanism corresponds to the placement platform and is used to clamp the circuit board.

[0010] The principle and effect of this technical solution:

[0011] 1. The pressure plate is connected to the control board through a connecting rod and a connecting nut, so that the pressure plate can be disassembled and assembled relative to the control board, and then the pressure plate at the bottom of the control board and the position of the probe relative to the pressure plate can be specifically set according to the model of the circuit board. Even if the corresponding pressure plate is replaced when testing circuit boards of different models, adaptation can be performed, and the detection range can be increased without changing the detection equipment. Since the position of the pressure plate relative to the control board is fixed, the circuit board position can be directly detected after being positioned by the clamping mechanism without repeatedly adjusting the position of the probe. Moreover, when continuously testing circuit boards of different sizes and models, the replacement method is easier than the adjustment method, and the positioning accuracy is higher (because the probe is positioned in advance relative to the pressure plate, and the connection position of the pressure plate relative to the control board is fixed), which is more conducive to mass detection.

[0012] 2. By placing the circuit board on the placement table in the shell, clamping and positioning the circuit board through the clamping mechanism, the detection position on the circuit board can be made to correspond to the probe, so that the probe can detect the circuit board by pressing down, and the positioning hole can guide the positioning rod to ensure the position of the control board, the pressure plate and the probe.

[0013] The utility model is further configured as follows: the clamping mechanism includes an adjusting component and two clamping units symmetrical about the placement table, the clamping unit includes a clamping plate, a guide rod, a driving rod, a clamping spring and an adjusting plate, the guide rod is slidably inserted into the shell, and the end of the guide rod is connected to the side of the clamping plate away from the placement table, the clamping plate slides on the inner side of the shell, and a through groove is provided on the side wall of the shell, one end of the driving rod is connected to the clamping plate, the other end of the driving rod passes through the through groove and is slidably inserted into the adjusting plate, the clamping spring is sleeved on the driving rod, the two ends of the clamping spring are respectively abutted against the adjusting plate and the clamping plate, the adjusting plate is slidably installed on the base, and the adjusting component is used to control the position of the adjusting plate relative to the shell.

[0014] The principle and effect of this technical solution are as follows: the circuit board can be moved away from the placement table by pressing the clamping plate, so that the circuit board is located between the two clamping plates, and the movement of the clamping plate is guided by the guide rod, and the clamping plate will spontaneously drive the circuit board to be centered left and right due to the elastic force of the clamping spring, so that the position of the detection point of the circuit board relative to the probe can be controlled by only controlling the front and rear position of the circuit board, and the position of the adjustment plate can be controlled by controlling the position of the adjustment plate through the adjustment component, so as to control the initial compression amount of the clamping spring, and then control the clamping force of the clamping plate on circuit boards of different sizes, so as to achieve the effect of stable clamping and protection of the circuit board.

[0015] The utility model is further configured as follows: the adjusting component includes an adjusting motor and an adjusting screw, the adjusting screw is a bidirectional screw, a sliding groove is provided on the base, the adjusting screw is rotatably installed in the sliding groove, the adjusting plate is slidably abutted against the sliding groove, and the adjusting plate is threadably matched with the adjusting screw, the end of the adjusting screw extends to be connected to the adjusting motor, and the adjusting motor is installed on the base.

[0016] The principle and effect of this technical solution are as follows: the adjusting motor drives the adjusting screw to rotate, so that the adjusting screw can drive the two adjusting plates to move relative to the shell, and the distance of the adjusting plate relative to the shell is controlled, that is, the spacing of the adjusting plate relative to the clamping plate is controlled. By controlling the spacing relative to the clamping plate, the initial compression of the clamping spring is controlled, so that the clamping force applied to circuit boards of different sizes when placed between the two clamping plates will not be too large or too small, thereby making the clamping mechanism more stable and not damaging the circuit boards (if the position of the adjusting plate remains unchanged, when circuit boards of different sizes are placed between the two clamping plates, the clamping forces provided are different due to the different compression amounts of the clamping springs, i.e., the clamping force provided to large-sized circuit boards is greater, and the clamping force provided to small-sized circuit boards is smaller, and thus excessive or too small clamping forces can easily lead to problems such as circuit board damage or unstable clamping).

[0017] The utility model is further configured as follows: a sliding guide surface is formed on one side of the clamping plate close to the placing table.

[0018] The principle and effect of this technical solution: the setting of the guide sliding surface allows the clamping plates to give way by pressing the guide sliding surface when the circuit board is placed between the two clamping plates, thereby making it easier to place the circuit board between the two clamping plates.

[0019] The utility model is further configured as follows: the clamping mechanism also includes a control component and two positioning units symmetrical about the placement table, the positioning unit includes a positioning plate and a limit rod, the positioning plate slides on the inner side of the shell, the limit rod is slidably inserted into the shell, and the end of the limit rod is connected to the side of the positioning plate away from the placement table, the axial direction of the limit rod is perpendicular to the axial direction of the guide rod, the control component includes a control motor and a control screw, the control screw is a bidirectional screw, the control screw is rotatably installed in the shell, and the control screw passes through the placement table, the positioning plate is threadedly mounted on the control screw, the control motor is installed on the outer wall of the shell, and one end of the control screw extends to be connected to the control motor.

[0020] The principle and effect of the technical solution: by setting the control component and the positioning unit, the positioning plate and the clamping plate can simultaneously limit the position of the circuit board on the placement table, so that the circuit board can be centered not only left and right, but also front and back, so that the detection position of the circuit board can be more accurate, and the two positioning plates can be moved relative to each other by controlling the motor to drive the control screw to rotate, so that the distance between the two positioning plates can be adjusted according to the size of the circuit board, so that the device can play a good centering function for circuit boards of different models, and the limit rod is used to guide the movement of the positioning plate and stop the positioning plate from rotating.

[0021] The utility model is further configured as follows: a spring-pressing assembly is also installed on the pressure plate, the spring-pressing assembly includes a spring-pressing block, a spring-pressing spring and a hanging bolt, a countersunk hole is opened on the top of the pressure plate, the hanging bolt is hung in the countersunk hole, and the end of the hanging bolt extends to the bottom of the pressure plate, the spring-pressing block is installed on the bottom of the hanging bolt, the spring-pressing spring is sleeved on the hanging bolt, and is located between the spring-pressing block and the pressure plate.

[0022] The principle and effect of this technical solution: after the circuit board is clamped and positioned by the clamping mechanism, as the pressure plate descends, the spring block can abut against the circuit board first, thereby further limiting the movement of the circuit board, so that the probe can accurately detect the circuit board, and when the probe leaves the circuit board, the spring block can also limit the adhesion and rise of the circuit board and the probe, thereby making the detection process smoother and more reliable, and the spring spring can drive the spring block to automatically reset, and at the same time has the performance of spring expansion and contraction.

[0023] The utility model is further configured as follows: it also includes a material lifting assembly, the material lifting assembly includes a push rod, a push plate and a material lifting rod, the base is provided with a accommodating cavity, the push rod is installed at the bottom of the accommodating cavity, the push plate is installed at the top of the push rod, and the push plate and the accommodating cavity are slidably matched, the material lifting rod is installed at the top of the push plate, and the material lifting rod is slidably inserted into the placement table.

[0024] The principle and effect of this technical solution: through the setting of the lifting component, after the circuit board is inspected and the spring-pressing component is disengaged, the push plate can be driven up by the push rod, so that the push plate drives multiple lifting rods to rise, thereby pushing the circuit board out of the clamping mechanism, making it easier to take the circuit board away. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the front view of the utility model;

[0026] Figure 2 It is a cross-sectional view of the utility model;

[0027] Figure 3 for Figure 2 A top view of the middle shell;

[0028] Figure 4 for Figure 3 Axonometric view of the middle shell. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples:

[0030] The reference numerals in the drawings of the specification include:

[0031] 101, base; 102, mounting frame; 103, cylinder; 104, control panel; 105, positioning rod; 106, slide groove; 107, accommodating chamber;

[0032] 201, pressing plate; 202, connecting rod; 203, connecting nut; 204, probe; 205, countersunk hole;

[0033] 301, a mounting bolt; 302, a pressure spring; 303, a pressure block;

[0034] 401, housing; 402, placement table; 403, positioning hole; 404, through slot;

[0035] 501, clamping plate; 502, guide rod; 503, driving rod; 504, clamping spring; 505, adjusting plate; 506, adjusting motor; 507, adjusting screw;

[0036] 601, positioning plate; 602, limiting rod; 603, control motor; 604, control screw;

[0037] 701, push rod; 702, push plate; 703, lifting rod.

[0038] As attached Figure 1-4As shown, the utility model discloses a circuit board testing fixture, including a base 101, a pressure plate 201, a detection table, a spring-pressing assembly and a material lifting assembly. A mounting frame 102 is installed on the top of the base 101, a cylinder 103 is installed on the top of the mounting frame 102, a control board 104 is installed on the movable end of the cylinder 103, positioning rods 105 are fixed around the bottom of the control board 104, the bottom of the positioning rods 105 is a smooth surface, and slide grooves 106 are respectively provided on the left and right sides of the upper end of the base 101, and a accommodating cavity 107 is provided at the center.

[0039] Connecting rods 202 are installed at both left and right ends of the top of the pressing plate 201. The connecting rods 202 are slidably inserted with the control board 104. The top thread of the connecting rod 202 is provided with a connecting nut 203. The connecting nut 203 is against the control board 104. A probe 204 is installed at the bottom of the pressing plate 201 (the position of the probe 204 is set according to the model of the circuit board to be detected, that is, the position of the probe 204 is controlled by the model of the circuit board, and the pressing plate 201 corresponds to the model of the circuit board), and the bottom edge of the probe 204 is higher than the bottom edge of the positioning rod 105. The spring-pressing assembly includes a spring-pressing block 303, a spring-pressing spring 302 and a hanging bolt 301. A countersunk hole 205 is opened on the top of the pressure plate 201. The hanging bolt 301 is hung in the countersunk hole 205, and the end of the hanging bolt 301 extends to the bottom of the pressure plate 201. The spring-pressing block 303 is installed at the bottom of the hanging bolt 301. The hanging spring is mounted on the hanging bolt 301 and is located between the spring-pressing block 303 and the pressure plate 201. When the hanging spring is at the maximum extension position, the bottom edge of the spring-pressing block 303 is lower than the bottom edge of the probe 204.

[0040] The testing platform includes a shell 401, a placement platform 402 and a clamping mechanism. The shell 401 is installed on the base 101. Positioning holes 403 are opened around the top surface of the shell 401. The positioning holes 403 are located directly below the positioning rod 105 and are compatible with the positioning rod 105. The placement platform 402 is installed on the base 101 and is located on the inner side of the shell 401. The accommodating chamber 107 is located directly below the placement platform 402. The lifting assembly includes a push rod 701, a push plate 702 and a lifting rod 703. The push rod 701 is installed at the bottom of the accommodating chamber 107, the push plate 702 is installed at the top of the push rod 701, and the push plate 702 is slidably matched with the accommodating chamber 107. The lifting rod 703 is installed at the top of the push plate 702, and the lifting rod 703 is slidably inserted with the placement platform 402. When the lifting rod 703 is at the lowest position, the top edge height of the lifting rod 703 is lower than the top edge height of the placement platform 402.

[0041] The clamping mechanism includes an adjustment component, a control component, two clamping units symmetrical about the placement table 402, and two positioning units symmetrical about the placement table 402. The clamping unit is perpendicular to the positioning unit. The clamping unit includes a clamping plate 501, a guide rod 502, a driving rod 503, a clamping spring 504 and an adjustment plate 505. The guide rod 502 is slidably inserted into the shell 401, and the end of the guide rod 502 is connected to the side of the clamping plate 501 away from the placement table 402. The clamping plate 501 slides on the inner side of the shell 401. The side wall of the shell 401 is provided with a through slot 404. One end of the driving rod 503 is connected to the clamping plate 501, and the other end of the driving rod 503 passes through the through slot 404. , and is slidably inserted with the adjustment plate 505, the clamping spring 504 is sleeved on the driving rod 503, and the two ends of the clamping spring 504 are respectively against the adjustment plate 505 and the clamping plate 501, the adjustment component includes an adjusting motor 506 and an adjusting screw 507, the adjusting screw 507 is a bidirectional screw, the adjusting screw 507 passes through two slide grooves 106, and is rotatably connected with the base 101, the lower end of the adjusting plate 505 is slidably abutted against the slide groove 106, and the adjusting plate 505 is threadedly matched with the adjusting screw 507, the end of the adjusting screw 507 extends to be connected to the adjusting motor 506, the adjusting motor 506 is installed on the base 101, and a guide sliding surface is formed on the side of the clamping plate 501 close to the placement table 402.

[0042] The positioning unit includes a positioning plate 601 and a limiting rod 602. The positioning plate 601 slides on the inner side of the shell 401. The limiting rod 602 is slidably inserted into the shell 401, and the end of the limiting rod 602 is connected to the side of the positioning plate 601 away from the placement table 402. The axial direction of the limiting rod 602 is perpendicular to the axial direction of the guide rod 502. The control component includes a control motor 603 and a control screw 604. The control screw 604 is a bidirectional screw. The control screw 604 is rotatably installed in the shell 401, and the control screw 604 passes through the placement table 402. The positioning plate 601 is threadedly mounted on the control screw 604. The control motor 603 is installed on the outer wall of the shell 401, and one end of the control screw 604 extends to be connected to the control motor 603.

[0043] Among them, the rotation of the adjustment motor 506 and the control motor 603 and the movement of the cylinder 103 are all controlled by the background PLC. The model of the circuit board to be tested is input in the background, so that each mechanism can make corresponding automatic adjustments. PLC is an existing commonly used signal receiving, control and transmission module, which is an existing commercially available product and will not be elaborated on.

[0044] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical scheme or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the technical scheme of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A circuit board test fixture, characterized in that: include A base, with a mounting frame installed on the top, a cylinder installed on the top of the mounting frame, a control board installed on the movable end of the cylinder, and a positioning rod fixed on the bottom of the control board; A pressure plate, with a connecting rod installed on the top, the connecting rod and the control plate are slidably inserted, the top thread of the connecting rod is sleeved with a connecting nut, the connecting nut is against the control plate, and a probe is installed at the bottom of the pressure plate, and the bottom edge of the probe is higher than the bottom edge of the positioning rod; The testing platform includes a shell, a placement platform and a clamping mechanism. The shell is installed on the base. A positioning hole is opened on the top surface of the shell. The positioning hole is adapted to the positioning rod. The placement platform is installed on the base and is located on the inner side of the shell. The clamping mechanism corresponds to the placement platform and is used to clamp the circuit board.

2. A circuit board test fixture as claimed in claim 1, characterized in that: The clamping mechanism includes an adjusting component and two clamping units symmetrical about the placing table, the clamping unit includes a clamping plate, a guide rod, a driving rod, a clamping spring and an adjusting plate, the guide rod is slidably inserted into the shell, and the end of the guide rod is connected to the side of the clamping plate away from the placing table, the clamping plate slides on the inner side of the shell, and a through groove is provided on the side wall of the shell, one end of the driving rod is connected to the clamping plate, and the other end of the driving rod passes through the through groove and is slidably inserted into the adjusting plate, the clamping spring is sleeved on the driving rod, and the two ends of the clamping spring are respectively abutted against the adjusting plate and the clamping plate, and the adjusting plate is slidably installed on the base, and the adjusting component is used to control the position of the adjusting plate relative to the shell.

3. A circuit board test fixture as claimed in claim 2, characterized in that: The adjustment assembly includes an adjustment motor and an adjustment screw, the adjustment screw is a bidirectional screw, a slide groove is provided on the base, the adjustment screw is rotatably installed in the slide groove, the adjustment plate is slidably abutted against the slide groove, and the adjustment plate is threadably matched with the adjustment screw, the end of the adjustment screw extends to be connected to the adjustment motor, and the adjustment motor is installed on the base.

4. A circuit board test fixture as claimed in claim 2, characterized in that: A sliding guide surface is formed on one side of the clamping plate close to the placing table.

5. A circuit board test fixture as claimed in claim 2, characterized in that: The clamping mechanism also includes a control component and two positioning units symmetrical about the placement table, the positioning unit includes a positioning plate and a limit rod, the positioning plate slides on the inner side of the shell, the limit rod is slidably inserted into the shell, and the end of the limit rod is connected to the side of the positioning plate away from the placement table, the axial direction of the limit rod is perpendicular to the axial direction of the guide rod, the control component includes a control motor and a control screw, the control screw is a bidirectional screw, the control screw is rotatably installed in the shell, and the control screw passes through the placement table, the positioning plate is threadedly mounted on the control screw, the control motor is installed on the outer wall of the shell, and one end of the control screw extends to be connected to the control motor.

6. A circuit board test fixture as claimed in claim 5, characterized in that: A spring-loaded assembly is also installed on the pressure plate, and the spring-loaded assembly includes a spring-loaded block, a spring-loaded spring and a hanging bolt. A countersunk hole is opened on the top of the pressure plate, and the hanging bolt is hung in the countersunk hole, and the end of the hanging bolt extends to the bottom of the pressure plate. The spring-loaded block is installed on the bottom of the hanging bolt, and the spring-loaded spring is mounted on the hanging bolt and is located between the spring-loaded block and the pressure plate.

7. A circuit board test fixture as claimed in claim 6, characterized in that: It also includes a material lifting assembly, which includes a push rod, a push plate and a material lifting rod. The base is provided with a accommodating cavity, the push rod is installed at the bottom of the accommodating cavity, the push plate is installed at the top of the push rod, and the push plate is slidably matched with the accommodating cavity, the material lifting rod is installed at the top of the push plate, and the material lifting rod is slidably inserted into the placement table.

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