Device for automatically detecting board flatness of circuit board test fixture

Abstract

The utility model discloses a device for automatically detecting the plate flatness of a circuit board test fixture, which comprises a lower needle plate arranged on a machine table, a lower carrier plate arranged on the lower needle plate in a sliding manner, an upper needle plate and an ejector pin arranged on the upper needle plate, and the lower carrier plate is provided with a profiling cavity for placing a PCB (Printed Circuit Board) to be detected. At least two groups of plate level sensors are diagonally arranged in the profiling cavity, a sensor power supply test point is arranged on the back surface of the profiling cavity, and the two groups of plate level sensors are electrically connected with the sensor power supply test point. Through the above mode, the device for automatically detecting the board flatness of the circuit board test fixture provided by the utility model can realize automatic board flatness detection without manual intervention, and effectively improves the test efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board testing, in particular to a device for automatic flatness detection of a circuit board testing fixture. Background Art

[0002] At present, the circuit board test fixtures in the electronics industry are all sucked together by vacuum or cylinder pressing. The pressure when the fixture is sucked together is very high. If the circuit board is not placed flat, it is very easy to cause the circuit board to be damaged and scrapped. The existing test fixtures do not have an automatic device to detect the flatness of the board. The tester is required to manually check whether the circuit board is placed in place. If the circuit board is not placed flat and the tester does not find any problems, the test will start, which will cause the circuit board to be crushed and scrapped. Therefore, this automatic circuit board automatic board flatness detection device is designed to meet actual production needs. Utility Model Content

[0003] The main technical problem solved by the utility model is to provide a device for automatic flatness detection of a circuit board test fixture, which can realize automatic flatness detection without human intervention, effectively improve test efficiency, have high detection accuracy, and completely avoid the problem of circuit board damage and scrapping caused by improper placement of circuit boards.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a device for automatic flatness detection of a circuit board test fixture, comprising: a lower needle plate arranged on a machine platform, a download plate slidably arranged on the lower needle plate, an upper needle plate and a top pin arranged on the upper needle plate, the download plate is provided with a contoured cavity for placing a PCB circuit board to be detected, at least two groups of flatness sensors are diagonally arranged in the contoured cavity, a sensor power supply test point is arranged on the back of the contoured cavity, and the two groups of the flatness sensors are electrically connected to the sensor power supply test point.

[0005] In a preferred embodiment of the utility model, flat sensors connected to the sensor power supply test points are arranged on the four corners of the contoured cavity.

[0006] In a preferred embodiment of the utility model, two sets of slide rails are arranged on the lower needle plate, and the download plate is connected to the sliders on the slide rails.

[0007] In a preferred embodiment of the present invention, a handle is provided on the side of the downloading plate.

[0008] In a preferred embodiment of the present invention, limiting columns are arranged around the contour cavity.

[0009] In a preferred embodiment of the utility model, a plurality of air holes are provided in the contoured cavity, and a vacuum suction device is provided.

[0010] The beneficial effects of the utility model are: it can realize automatic board flatness detection without human intervention, effectively improve test efficiency, have high detection accuracy, completely avoid the problem of circuit board damage and scrapping caused by improper placement of circuit boards, have a simple structure, low installation cost, can be directly connected to various test systems, and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0012] Figure 1 It is a side view of a device for automatic flatness detection of a circuit board test fixture of the utility model;

[0013] Figure 2 It is a top view of the download plate in the utility model. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See also Figure 1-2 The embodiment of the utility model is a device for automatic flatness detection of a circuit board test fixture, comprising: a lower needle plate 1 arranged on a machine platform, a download plate 2 slidably arranged on the lower needle plate, an upper needle plate 3 and an ejector pin 4 arranged on the upper needle plate. Specifically, two sets of slide rails 5 are arranged on the lower needle plate, and the download plate is connected to the sliders on the slide rails to achieve sliding connection. In order to facilitate the push-pull and slide-out of the download plate, a handle 6 is arranged on the side of the download plate, and a contour cavity 21 for placing a PCB circuit board to be detected is arranged on the download plate. Limiting columns 7 are arranged around the contour cavity to align and limit the placed PCB circuit board 8. At least two sets of flatness sensors 9 are arranged diagonally in the contour cavity, and a sensor power supply test point (not shown in the figure) is arranged on the back of the contour cavity. The two sets of flatness sensors are electrically connected to the sensor power supply test point.

[0016] In another embodiment of the utility model, flat sensors connected to sensor power supply test points are arranged at the four corners of the profiling cavity, a plurality of air holes 10 are opened in the profiling cavity, and an external existing vacuum suction device is configured.

[0017] Working principle: In the specific implementation, according to the specific situation of the copper foil layer of the internal wiring of the actual circuit board, the micro-board flatness sensor is installed at the corresponding position of the diagonal or four corners of the test fixture download board and is strictly set. The gap between the board flatness sensor surface and the PCB circuit board shall not be greater than 2.1 mm. When the tester puts the circuit board to be tested into the contoured cavity of the download board, the board flatness sensor installed on the test fixture immediately detects whether the circuit board is flat and transmits the detected signal to the signal processing module. After the signal is processed, it is transmitted to the test machine. The test program automatically runs the board flatness detection program. When the distance between the PCB circuit board to be tested in the download board and the board flatness sensor is less than 2.1 mm, it indicates that the circuit board has been put in place, and the test fixture is attracted and starts normal testing; on the contrary, if it is detected that the distance between the PCB circuit board to be tested and the board flatness sensor is greater than 2.1 mm, it indicates that the circuit board is not put in place and there is a risk of crushing. The test program will not be attracted. At this time, the tester needs to re-place the circuit board until it is in place before testing, so as to avoid the phenomenon of crushing the board due to the circuit board not being put in place.

[0018] In summary, the utility model discloses a device for automatic flatness detection of a circuit board test fixture, which can realize automatic flatness detection without manual intervention, effectively improve test efficiency, have high detection accuracy, and completely avoid the problem of circuit board damage and scrapping caused by improper placement of circuit boards. It has a simple structure, low installation cost, can be directly connected to various test systems, and has strong versatility.

[0019] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for automatically detecting the flatness of a circuit board test fixture, characterized in that: include: A lower needle plate is arranged on the machine platform, a download plate is slidably arranged on the lower needle plate, an upper needle plate and an ejector pin is arranged on the upper needle plate, the download plate is provided with a contour cavity for placing a PCB circuit board to be detected, at least two groups of board flatness sensors are diagonally arranged in the contour cavity, a sensor power supply test point is arranged on the back of the contour cavity, and the two groups of board flatness sensors are electrically connected to the sensor power supply test point.

2. The device for automatic flatness detection of a circuit board test fixture according to claim 1, characterized in that: Flat sensors connected to the sensor power supply test points are arranged at the four corners of the contoured cavity.

3. The device for automatic flatness detection of a circuit board test fixture according to claim 1, characterized in that: The lower needle plate is provided with two sets of slide rails, and the download plate is connected with the sliders on the slide rails.

4. The device for automatic flatness detection of a circuit board test fixture according to claim 3, characterized in that: A handle is arranged on the side of the downloading plate.

5. The device for automatic flatness detection of a circuit board test fixture according to claim 1, characterized in that: Limiting columns are arranged around the contour cavity.

6. The device for automatic flatness detection of a circuit board test fixture according to claim 1, characterized in that: A plurality of air holes are provided in the contour cavity, and a vacuum suction device is arranged therein.

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