Circuit board environment stress screening device

Abstract

The utility model discloses a circuit board environment stress screening device which comprises a box body, a bottom plate and a first top plate, openings are formed in the upper portion and the lower portion of the box body, the bottom plate is matched with the opening in the lower portion of the box body, and a plurality of clamping parts are arranged on the two opposite inner wall faces in the box body. A slot for mounting a screened circuit board is formed between every two adjacent clamping parts on the same inner wall surface, a cable is arranged on the box body, the debugging plate is mounted on the bottom plate, a plurality of connecting parts for connecting the screened circuit board are arranged on the debugging plate, the cable is connected with the debugging plate, and the second top plate is connected with the radiator. During low-temperature screening, the first top plate is matched with the opening in the upper portion of the box body, and during high-temperature screening, the second top plate is matched with the opening in the upper portion of the box body. Under the condition that the environmental stress screening requirement is met, operation and cable connection are simplified, and efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical control technical field, especially relate to a circuit board environmental stress screening device. BACKGROUND

[0002] Circuit board is an important component of product, in order to ensure the quality of circuit board, each circuit board should be tested and environmental stress screening when manufacturing.

[0003] Environmental stress screening is the process of exposing potential defects inside by applying reasonable environmental stress (such as temperature cycle, random vibration, etc.) or electrical stress within the design range to electronic or electromechanical products. Scientific and reasonable environmental stress screening can improve product reliability and reduce field repair rate.

[0004] The existing temperature cycle screening device for circuit board usually adopts a box body, installs the circuit board in the box body, detects the circuit board after power on. Although the existing temperature cycle screening device can complete the screening of the circuit board, each circuit board needs to be connected to the corresponding cable, which is complicated, time-consuming and laborious, and low in efficiency. UTILITY MODEL CONTENTS

[0005] The utility model provides a circuit board environmental stress screening device, and the utility model discloses in the case of satisfying environmental stress screening requirement, simplifies operation and cable connection, improves efficiency.

[0006] The technical scheme solving the above problems is as follows:

[0007] The circuit board environmental stress screening device comprises a box body, a bottom plate, a first top plate, the upper portion and the lower portion of the box body are each provided with an opening, the bottom plate is matched with the opening in the lower portion of the box body, a plurality of clamping components are arranged on the opposite inner wall surfaces in the box body, a slot for installing the screened circuit board is formed between the adjacent two clamping components on the same inner wall surface, a cable is arranged on the box body, further comprising a debugging board, a second top plate and a radiator, the debugging board is installed on the bottom plate, a plurality of connecting components for connecting the screened circuit board are arranged on the debugging board, the cable is connected with the debugging board, the radiator is installed on the second top plate, when low-temperature screening is carried out, the first top plate is matched with the opening in the upper portion of the box body, when high-temperature screening is carried out, the second top plate is matched with the opening in the upper portion of the box body.

[0008] Further, the opening end face in the lower portion of the box body is provided with a first sealing component, and the opening end face in the upper portion of the box body is provided with a second sealing component.

[0009] Further, a plurality of grooves for reducing the weight of the box body are arranged on the side wall of the box body.

[0010] Further, the mounting plate with heat dissipation holes is further included, the box body is provided with mounting holes, and the mounting plate is fixed with the box body after being matched with the mounting holes.

[0011] Further, the fastening assembly is further included, the bottom plate is provided with the convex part, and the debugging board is fastened as a whole with the convex part through the fastening assembly.

[0012] The circuit board environmental stress screening device realizes communication between the debugging board and the measured circuit board through the CAN bus, responds to external excitation through simulation of main external excitation signals of a product, outputs corresponding data through the bus, and judges that corresponding functions of the product control board are normal when the debugging board receives the bus data. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a front view of the circuit board environmental stress screening device.

[0014] Figure 2 It is a sectional view of the circuit board environmental stress screening device.

[0015] Figure 3 It is a top view after hiding the first top plate on the basis of Figure 1 .

[0016] Figure 4 It is a right view of Figure 1 .

[0017] Figure 5 It is a schematic view after replacing the first top plate with the second top plate on the basis of Figure 1 .

[0018] Figure 6 It is a circuit block diagram during testing.

[0019] Markings in the drawings:

[0020] Box body 1, cable 1a, first sealing part 1b, second sealing part 1c, groove 1d, bottom plate 2, convex part 2a, first top plate 3, clamping part 4, insertion slot 5, debugging board 6, connecting part 6a, second top plate 7, radiator 8, mounting plate 9, heat dissipation hole 9a, fastening assembly 10, handle 11, sampling circuit 12, DSP chip 13, CAN bus 14, detection computer 15, panel 16, indicator light 17. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 6 As shown, the circuit board environmental stress screening device of the present invention comprises a housing 1, a bottom plate 2, and a first top plate 3. The housing 1 has openings at both the top and bottom. The bottom plate 2 mates with the lower opening of the housing 1. Multiple latching components 4 are provided on two opposing inner walls of the housing 1. A slot 5 for mounting the circuit board A to be screened is formed between adjacent latching components 4 on the same inner wall. The housing 1 is provided with a cable 1a and further includes a debug board 6, a second top plate 7, and a heat sink 8. The debug board 6 is mounted on the bottom plate 2 and is provided with multiple connecting components 6a for connecting to the circuit board A to be screened, facilitating communication between the circuit board A and the debug board 6. The cable 1a is connected to the debug board 6, and the heat sink 8 is mounted on the second top plate 7. During low-temperature screening, the first top plate 3 mates with the upper opening of the housing 1. During high-temperature screening, the second top plate 7 mates with the upper opening of the housing 1. The operating power supply of the circuit board environmental stress screening device of the present invention is DC27±0.5V, a common DC power supply mechanism that is easy to implement.

[0023] A first sealing member 1b is provided on the lower open end surface of the housing 1, and a second sealing member 1c is provided on the upper open end surface of the housing 1. The first and second sealing members 1b and 1c are preferably made of rubber. The first sealing member 1b seals the gap between the bottom plate 2 and the housing 1, while the second sealing member 1c seals the gap between the housing 1 and the first or second top plates 3 and 7.

[0024] The side walls of the box body 1 are provided with a plurality of grooves 1d for reducing the weight of the box body 1. Since the circuit board environmental stress screening device often needs to be moved, the plurality of grooves 1d for reducing the weight of the box body 1 are provided on the side walls of the box body 1 to reduce the burden during transportation.

[0025] The present invention also includes a mounting plate 9 having heat dissipation holes 9a. The mounting holes are provided in the housing 1, and the mounting plate 9 engages with the mounting holes to secure the housing 1. During the screening process, the circuit boards A need to be kept in operation. Because multiple circuit boards A are installed within the housing 1 (six are shown in the diagram of the present invention), the circuit boards A generate considerable heat during this process. The heat dissipation holes facilitate the dissipation of heat within the housing 1.

[0026] The utility model also includes fastening subassembly 10, is equipped with the boss portion 2a on the bottom plate 2, passes through fastening subassembly 10 and tightens the debugging board 6 and the boss portion 2a as a whole. Fastening subassembly 10 includes no plating steel wire screw sleeve, washer and screw, is equipped with through -hole on the debugging board 6, is equipped with screw hole on the boss portion 2a, no plating steel wire screw sleeve is located on the debugging board 6, washer is located between the boss portion 2a and the debugging board 6, and the screw is connected with the screw hole on the boss portion 2a after passing no plating steel wire screw sleeve.

[0027] The utility model also includes handle 11, handle 11 is fixed with box 1, and is convenient to carry through handle, and it is convenient to save manpower.

[0028] The utility model also includes sampling circuit 12, DSP chip 13, CAN bus 14, detection computer 15, the input of sampling circuit 12 is electrically connected with debugging board 6, and the output of sampling circuit 12 is connected with the input of DSP chip 13, and the output of DSP chip 13 is connected with CAN bus 14, and CAN bus 14 is connected with detection computer 15. DSP chip 13 is the digital signal processor of TMS320F28335 type, and sampling circuit 12 is the photoelectric coupler of GH302 type, and has adopted the CAN transceiver chip of CTM1050 type in detection computer 15.

[0029] The utility model also includes panel 16 and pilot lamp 17, and pilot lamp 17 is connected with debugging board 6, and each block measured circuit board A corresponds a pilot lamp 17, and the output signal of measured circuit board A detection completion arrives pilot lamp 17, makes the working state of circuit board A at a glance.

[0030] The utility model in the adoption test software is embedded software, and power on automatic operation, power off termination. Software is installed in the inside of DSP chip 13, and after the power on of system, carries out system initialization process, then sends the handshake instruction to measured circuit board A, and after receiving the response of the other party, then it is explained that the software and its communication link are normal;The whole software architecture mainly adopts the cyclic design coding of mode, and is mainly with the interrupt response mode, and according to each interrupt, sends corresponding communication data to CAN bus, to complete software equipment function.

[0031] The utility model discloses when using, dismounts first roof 3 or second roof 7, makes the opening of box 1 upper portion expose in the air, along with the slot 5 of circuit board A is inserted, makes the connector on circuit board A and the plug-in cooperation of connecting part 6a, covers first roof 3 or second roof 7. With the measured circuit board A control analog signal as interrupt source, realize digital analog isolation through sampling circuit 12, after DSP chip 13 receives analog signal, response interrupt, corresponding data is exported through CAN bus 14, and detection computer 15 can read CAN bus data through USB CAN analyzer, realizes CAN communication function. After power-on initialization is completed, the main program is executed circularly, when receiving external interrupt (the measured circuit board A analog signal), response interrupt, enter interrupt processing flow, according to the difference of interrupt source (first circuit board to sixth circuit board), and debugging board 6 sends corresponding data frame to bus, and detection computer 15 real-time monitoring bus data. Circuit board A environmental stress screening device realizes the communication of screening device debugging board 6 and the measured circuit board A through CAN bus 14, through the simulation product main external excitation signal, and debugging software responds external excitation, and exports corresponding data through bus, and debugging board 6 receives bus data, then judges circuit board A corresponding function normal.

[0032] Finally, it should be noted that: the above-described embodiments are merely the preferred embodiments of the utility model for describing the technical solutions of the utility model, and are not limited to them, and are not limited to the protection scope of the utility model; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the protection scope of the claims.

Claims

1. A circuit board environmental stress screening device, comprising a box body (1), a bottom plate (2), and a first top plate (3), wherein the box body (1) is provided with openings at the top and bottom, and the bottom plate (2) cooperates with the opening at the bottom of the box body (1), a plurality of clamping components (4) are provided on two opposite inner wall surfaces of the box body (1), and a slot (5) for mounting a screened circuit board is formed between two adjacent clamping components (4) on the same inner wall surface, and a cable (1a) is provided on the box body (1), characterized in that: The invention also includes a debugging board (6), a second top board (7), and a radiator (8). The debugging board (6) is installed on the bottom board (2). The debugging board (6) is provided with a plurality of connecting components (6a) for connecting with the screened circuit board. The cable (1a) is connected to the debugging board (6). The radiator (8) is installed on the second top board (7). When low-temperature screening is performed, the first top board (3) is used to cooperate with the opening on the upper part of the box body (1). When high-temperature screening is performed, the second top board (7) is used to cooperate with the opening on the upper part of the box body (1).

2. The circuit board environmental stress screening device according to claim 1, characterized in that: A first sealing component (1b) is provided on the open end surface of the lower portion of the box body (1), and a second sealing component (1c) is provided on the open end surface of the upper portion of the box body (1).

3. The circuit board environmental stress screening device according to claim 1, wherein: A plurality of grooves (1d) for reducing the weight of the box body (1) are provided on the side wall of the box body (1).

4. The circuit board environmental stress screening device according to claim 1, wherein: It also includes a mounting plate (9) having a heat dissipation hole (9a), the housing (1) is provided with a mounting hole, and the mounting plate (9) is fixed to the housing (1) after being matched with the mounting hole.

5. The circuit board environmental stress screening device according to claim 1, wherein: It also includes a fastening assembly (10), wherein a raised portion (2a) is provided on the bottom plate (2), and the debugging plate (6) and the raised portion (2a) are fastened together as a whole via the fastening assembly (10).

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