Circuit board vibration test tool and vibration test equipment

Abstract

The application relates to the technical field of vibration test fixtures, and discloses a circuit board vibration test tool and a vibration test equipment, which comprises a first plate body, a second plate body, a third plate body and a fixing plate, the first plate body is provided with a first connecting part; the second plate body is perpendicular to the first plate body, and the second plate body is provided with a second connecting part; the third plate body is perpendicular to the first plate body and the second plate body, and the third plate body is connected with the first plate body and the second plate body; the fixing plate is arranged in parallel with the third plate body, the fixing plate is connected with the third plate body, the fixing plate is provided with a third connecting part, a connecting column and a plurality of connecting holes, at least part of the connecting holes is detachably connected with the connecting column, the connecting column is located on the side of the fixing plate away from the third plate body, and the connecting column is used for being connected with a circuit board, so that the problems that a long time is consumed for circuit board vibration test and the operation is complicated are solved or improved.

Description

Technical Field

[0001] This application relates to the field of vibration testing fixture technology, specifically to circuit board vibration testing fixtures and vibration testing equipment. Background Technology

[0002] During the research and development and production of electronic products, environmental stress screening and reliability acceptance tests are generally required. These tests include vibration testing, which requires testing the X-axis, Y-axis and Z-axis of the product separately.

[0003] In related technologies, vibration tables have a single vibration direction. After completing a vibration test in one direction, the orientation of the vibration platform needs to be manually adjusted to perform vibration tests in another direction, which is time-consuming and cumbersome. Utility Model Content

[0004] This application provides a circuit board vibration testing fixture and vibration testing equipment to solve or improve the problems of long testing time and cumbersome operation of circuit board vibration testing.

[0005] In the first aspect, this application provides a circuit board vibration testing fixture, including a first plate body, a second plate body, a third plate body, and a fixing plate, the specific scheme of which is as follows.

[0006] The first plate has a first connecting portion; the second plate is perpendicular to the first plate and has a second connecting portion; the third plate is perpendicular to both the first and second plates and is connected to both the first and second plates; a fixing plate is arranged parallel to the third plate and is connected to the third plate. The fixing plate has a third connecting portion, a connecting post, and multiple connecting holes. At least some of the connecting holes are detachably connected to the connecting post. The connecting post is located on the side of the fixing plate opposite to the third plate and is used to connect to the circuit board.

[0007] Beneficial effects: By using a first plate, a second plate, and a third plate arranged perpendicularly to each other, and a fixed plate arranged parallel to the third plate and detachably connected, the circuit board can be vibrated in three directions through the first connecting part, the second connecting part, and the third connecting part, respectively connected to the vibration table (wherein, when the third connecting part is connected to the vibration table, the fixed plate is separated from the third plate). This eliminates the need to manually adjust the orientation of the vibration table after completing the vibration test in one direction to test the vibration in another direction. The connection and disassembly of the first connecting part, the second connecting part, and the third connecting part to the vibration table are simple and quick, reducing the testing time.

[0008] Meanwhile, when testing circuit boards of different sizes, the mounting plate has multiple connection holes, which can be changed to connect the connecting post to different connection holes, thus enabling the connecting post to connect to circuit boards of different sizes.

[0009] In one alternative embodiment, a first heating element is provided on the fixing plate.

[0010] In one optional embodiment, the system further includes a controller, wherein there are multiple first heating elements, which are evenly distributed on the fixed plate and are electrically connected to the controller.

[0011] In one alternative embodiment, a plurality of the first heating elements are fixedly disposed on the side of the fixing plate opposite to the third plate.

[0012] In an optional embodiment, a heating plate is further included, which is spaced apart from the fixing plate and is detachably connected to the fixing plate. A circuit board on the heating plate and the fixing plate is spaced apart, with the circuit board located between the heating plate and the fixing plate.

[0013] In one optional embodiment, the heating plate includes a plate body and a plurality of second heating elements, the plurality of second heating elements being evenly distributed on the plate body.

[0014] In one alternative embodiment, a plurality of the second heating elements are fixedly disposed on the side of the plate body near the fixed plate.

[0015] In one optional embodiment, the fixing plate is fixedly connected to both sides of the third plate.

[0016] In one optional embodiment, reinforcing ribs are provided at the locations where the third plate connects to the first plate and the second plate.

[0017] Secondly, this application also provides a vibration testing device, including the circuit board vibration testing fixture described above.

[0018] Beneficial effects: Since the vibration testing equipment includes vibration testing fixtures and has the same technical effects as vibration testing fixtures, it will not be elaborated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is an isometric view of a circuit board vibration testing fixture according to an embodiment of this application; Figure 2 This is an axonometric view of a circuit board vibration testing fixture according to an embodiment of this application; Figure 3 This is an isometric view of another circuit board vibration testing fixture according to an embodiment of this application; Figure 4 This is a right view of another circuit board vibration testing fixture according to an embodiment of this application; Figure 5 This is an isometric view of another circuit board vibration testing fixture according to an embodiment of this application, with the heating plate removed; Figure 6 This is an isometric view of the heating plate in another circuit board vibration testing fixture according to an embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 1. First plate; 2. Second plate; 3. Third plate; 4. Fixing plate; 5. Heating plate; 6. Reinforcing rib; 7. Circuit board; 11. First connecting part; 21. Second connecting part; 31. Pad; 41. Third connecting part; 42. Connecting post; 43. Connecting hole; 44. First heating element; 51. Plate body; 52. Second heating element; 53. Protruding post. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two elements. The terms "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where an acceptable deviation range for approximate parallelism can be, for example, within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where an acceptable deviation range for approximate perpendicularity can also be, for example, within 5°. "Equal" includes absolute equality and approximate equality, where an acceptable deviation range for approximate equality can be, for example, a difference between the two equal items being less than or equal to 5% of either one. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] During the research and development and production of electronic products, environmental stress screening and reliability acceptance tests are generally required. These tests include vibration testing, which requires testing the X-axis, Y-axis and Z-axis of the product separately.

[0025] In related technologies, the vibration table has a single vibration direction. After completing the vibration test in one direction, the orientation of the vibration table needs to be manually adjusted to achieve vibration testing in another direction, which is time-consuming and cumbersome.

[0026] The following is combined with Figures 1 to 6 This describes an embodiment of the present application.

[0027] According to embodiments of this application, in one aspect, a circuit board vibration testing fixture is provided, such as... Figure 1 As shown, it includes a first plate 1, a second plate 2, a third plate 3, and a fixing plate 4. The specific scheme is as follows.

[0028] like Figure 1 As shown, the first plate 1 is rectangular or circular, and can be made of metal plates, such as aluminum plates or steel plates. Preferably, the material is aerospace-grade aluminum alloy. Aerospace-grade aluminum alloy has extremely high specific strength (strength to weight ratio) and excellent damping characteristics, which can minimize the resonance and energy absorption of the tooling itself when transmitting high-frequency vibrations, and ensure that the vibration energy is efficiently transmitted to the object being tested.

[0029] like Figure 1 As shown, the first plate 1 has a first connecting part 11; specifically, the first connecting part 11 is a threaded hole array or other snap-fit ​​structure, etc., for high-rigidity bolt connection with the corresponding interface on the vibration table, such as the first connecting part 11 being threaded holes arranged at the four corners of the first plate 1.

[0030] like Figure 1 As shown, the material and shape of the second plate 2 can be the same as or different from the first plate 1. The second plate 2 is perpendicular to the first plate 1 and has a second connecting part 21. Specifically, the second connecting part 21 is a threaded hole array or other snap-fit ​​structure, etc., used to make a high-rigidity bolt connection with the corresponding interface on the vibration table. For example, the second connecting part 21 is a threaded hole arranged at the four corners of the second plate 2.

[0031] like Figure 1 As shown, the material and shape of the third plate 3 can be the same as or different from the first plate 1. The third plate 3 is perpendicular to both the first plate 1 and the second plate 2. The third plate 3 is connected to both the first plate 1 and the second plate 2 by welding.

[0032] like Figure 1 and Figure 5 As shown, the fixing plate 4 is rectangular and made of the same material as the first plate 1. The fixing plate 4 is parallel to the third plate 3 and is connected to the third plate 3. The fixing plate 4 has a third connecting part 41, a connecting post 42 and multiple connecting holes 43. At least some of the connecting holes 43 are detachably connected to the connecting post 42. The multiple connecting posts 42 are located on the side of the fixing plate 4 away from the third plate 3. The connecting post 42 is used to connect with the circuit board 7. The third connecting part 41 is a threaded hole array or other snap-fit ​​structure, etc., used to make a high-rigidity bolt connection with the vibration table or the corresponding interface on the third plate 3. For example, the second connecting part 21 is a threaded hole arranged at the four corners of the second plate 2.

[0033] Specifically, such as Figure 1 As shown, a pad 31 is provided between the third plate 3 and the fixed plate 4, and the third plate 3, the pad 31 and the fixed plate 4 are connected by bolts.

[0034] Multiple connection holes 43 are arranged in a rectangular array on the fixing plate 4. At least some of the connection holes 43 are connected to the connection posts 42 by means of bolts or snap-fit. The connection posts 42 are provided with threaded holes to facilitate the connection of the circuit board 7 to the connection holes 43 by bolts.

[0035] In specific usage, such as Figure 1 As shown, the circuit board 7 has multiple mounting holes evenly distributed along its edge. The circuit board 7 is connected to the corresponding connecting post 42 on the fixing plate 4 by bolts. Then, the fixing plate 4 is connected to the third plate body 3 in parallel and spaced order through the third connecting part 41.

[0036] The circuit board vibration test fixture is fixed on the vibration table by the first connecting part 11 on the first plate 1 to perform vibration test and complete the test of the circuit board 7 in one direction (such as the X direction).

[0037] Then, the circuit board vibration test fixture is removed from the vibration table and fixed on the vibration table through the second connecting part 21 on the second plate 2 to perform vibration test, thus completing the test of the circuit board 7 in another direction (such as the Y direction).

[0038] Then, the circuit board vibration test fixture is removed from the vibration table, and the fixing plate 4 is removed from the third plate 3. The circuit board vibration test fixture is fixed on the vibration table through the third connecting part 41 on the fixing plate 4, and the vibration test is carried out to complete the test of the circuit board 7 in another direction (such as the Z direction).

[0039] In this embodiment, such as Figure 1 As shown, the first plate 1, the second plate 2, and the third plate 3 are arranged perpendicularly in pairs, and the fixing plate 4 is arranged parallel to the third plate 3 and is detachably connected. Through the first connecting part 11, the second connecting part 21, and the third connecting part 41, they are respectively connected to the vibration table (wherein, when the third connecting part 41 is connected to the vibration table, the fixing plate 4 is separated from the third plate 3). This allows vibration testing of the circuit board 7 in three directions to be realized. There is no need to manually adjust the orientation of the vibration table after completing the vibration test in one direction to test the vibration in another direction. The connection and disassembly of the first connecting part 11, the second connecting part 21, and the third connecting part 41 to the vibration table is simple and quick, which can reduce the testing time.

[0040] Meanwhile, when facing circuit boards 7 of different sizes during testing, since the fixing plate 4 is provided with multiple connection holes 43, the connection post 42 can be connected to the connection hole 43 at different positions by changing the connection of the connection post 42, thereby enabling the connection post 42 to be connected to circuit boards 7 of different sizes.

[0041] In one embodiment, such as Figure 1As shown, a first heating element 44 is provided on the fixed plate 4. Specifically, the first heating element 44 can be a silicone heating sheet or a ceramic (such as alumina) encapsulated strip heater. The silicone heating sheet is characterized by its extremely thin thickness (less than 1.5 mm), good flexibility, and ability to be tightly attached to the surface of the fixed plate 4 or embedded inside the fixed plate 4. It has a fast thermal response speed and good insulation and mechanical durability. The ceramic heater is more robust and has a higher power density.

[0042] Specifically, the first heating element 44 is firmly attached to the side of the fixing plate 4 facing the circuit board 7 (i.e. the side away from the third board 3) by a high-temperature resistant thermally conductive adhesive (such as epoxy resin or silicone-based adhesive).

[0043] During the test, the first heating element 44 is powered on and generates heat to simulate the actual working environment temperature of the circuit board 7, and then a vibration test is performed.

[0044] In this embodiment, such as Figure 1 As shown, a first heating element 44 is set on the fixed plate 4 to generate heat, thereby simulating the working environment temperature of the circuit board 7 on the fixed plate 4. This makes the test no longer a simple mechanical fatigue test, but a more realistic comprehensive stress assessment, which can more effectively stimulate those temperature-sensitive defects, such as creep fatigue failure of solder joints between materials with different thermal expansion coefficients, thereby improving the accuracy of vibration testing of the circuit board 7.

[0045] At the same time, it eliminates the need to rely on large and expensive environmental test chambers, greatly reducing the threshold and cost of achieving such high-end testing.

[0046] In one embodiment, the circuit board vibration testing fixture also includes a controller, such as... Figure 1 As shown, there are multiple first heating elements 44, which are evenly distributed on the fixed plate 4, and all of the multiple first heating elements 44 are electrically connected to the controller.

[0047] Specifically, the fixed plate 4 can be divided into multiple areas, such as 4 to 9 areas. Each area is embedded with an independent first heating element 44. The first heating element 44 can have the same power or can be designed with different power according to the hot spots on the circuit board 7.

[0048] The controller can be an electronic control unit based on a microprocessor (such as the ARM Cortex-M series) or a PLC (Programmable Logic Controller). The controller's housing is usually made of metal to provide electromagnetic shielding and mechanical protection.

[0049] Preferred, such as Figure 1As shown, multiple first heating elements 44 are fixedly mounted on the side of the fixed plate 4 away from the third plate 3, which allows them to be closer to the circuit board 7, resulting in the fastest heating response and the highest energy utilization rate.

[0050] In the specific testing process, the controller controls whether multiple first heating elements 44 heat up, and the heating power of each first heating element 44, so as to heat different positions of the circuit board 7 at different temperatures. In this embodiment, such as Figure 1 As shown, multiple first heating elements 44 are evenly distributed on the fixed plate 4, and all multiple first heating elements 44 are electrically connected to the controller, which can realize the temperature control of the environment of different parts of the circuit board 7, so as to more precisely control the ambient temperature of each part of the circuit board 7, and further improve the accuracy of the ambient temperature of the circuit board 7 during vibration testing.

[0051] In one embodiment, such as Figure 3 and Figure 4 As shown, the circuit board vibration test fixture also includes a heating plate 5. The heating plate 5 is a plate that can generate heat. It can be an existing product that can be purchased on the market. The heating plate 5 is spaced apart from the fixing plate 4. The heating plate 5 and the fixing plate 4 are detachably connected. The circuit board 7 on the heating plate 5 and the fixing plate 4 is spaced apart. The circuit board 7 is located between the heating plate 5 and the fixing plate 4.

[0052] Specifically, such as Figure 6 As shown, the heating plate 5 is provided with a protruding post 53, which is connected to the fixing plate 4 by bolts. Of course, the fixing plate 4 can also be provided with a protruding post 53, and the heating plate 5 is connected to the protruding post 53 by bolts.

[0053] In specific use, for tests where circuit board 7 requires double-sided heating, the heating plate 5 is positioned above the fixing plate 4 via the protruding posts 53 at its four corners. The height is adjusted to ensure that it does not touch tall components (such as electrolytic capacitors and heat sinks) on circuit board 7, and then the nuts are tightened.

[0054] The heating plate 5 is connected to the controller. During the vibration test, the first heating element 44 on the fixed plate 4 and the heating plate 5 simultaneously heat both sides of the circuit board 7, which can make the circuit board 7 reach thermal equilibrium more quickly and simulate the thermal radiation environment from the product casing or adjacent boards.

[0055] In this embodiment, such as Figure 3 and Figure 4As shown, heating plates 5 are spaced apart on a fixed plate 4, and circuit board 7 is located between the heating plate 5 and the fixed plate 4, which realizes simultaneous heating of both sides of circuit board 7, creating a more uniform and realistic three-dimensional temperature field, enabling the fixture to cover a variety of test scenarios from simple to extremely complex.

[0056] In one embodiment, such as Figure 6 As shown, the heating plate 5 includes a plate body 51 and multiple second heating elements 52. The multiple second heating elements 52 are evenly distributed on the plate body 51 and are all connected to the controller. Specifically, the plate body 51 is made of a plate with high thermal conductivity, such as an aluminum plate or a copper plate. The surface of the plate body 51 is anodized and blackened to improve the thermal radiation rate.

[0057] The second heating element 52 is similar to the first heating element 44, and can be a silicone heating sheet or the like that pasted on the inside of the board body 51 (the side facing the circuit board 7).

[0058] Preferably, multiple second heating elements 52 are fixedly disposed on the side of the board body 51 near the fixing plate 4, which allows them to be closer to the circuit board 7, resulting in the fastest heating response speed and the highest energy utilization rate.

[0059] In this embodiment, such as Figure 6 As shown, multiple second heating elements 52 are evenly distributed on the board body 51, and all of the multiple second heating elements 52 are electrically connected to the controller, which can realize the temperature control of the environment of different parts of the circuit board 7, so as to more precisely control the ambient temperature of each part of the circuit board 7, and further improve the accuracy of the ambient temperature of the circuit board 7 during vibration testing.

[0060] In one embodiment, such as Figure 2 As shown, the third plate 3 has fixing plates 4 fixedly connected to both sides, which can fix two circuit boards 7 at the same time for simultaneous vibration testing, thereby improving the efficiency of vibration testing.

[0061] Specifically, a fixing plate 4 is fixedly connected to both sides of the third plate 3, and a heating plate 5 is provided on both sides of the fixing plate 4.

[0062] In one embodiment, such as Figure 5 As shown, the third plate 3 is provided with reinforcing ribs 6 at the connection points with the first plate 1 and the second plate 2. Specifically, the reinforcing ribs 6 are triangular in shape and their thickness is usually 1 / 2 to 2 / 3 of the thickness of the third plate 3. The material of the reinforcing ribs 6 is consistent with that of the third plate 3, such as aluminum alloy or structural steel.

[0063] In this embodiment, such as Figure 5As shown, the setting of the reinforcing rib 6 can improve the connection strength between the third plate 3 and the first plate 1 and the second plate 2, significantly suppress the small deformation and relative displacement of the connection under vibration, thereby increasing the first natural frequency of the entire fixture and making it further away from the test frequency band, thus ensuring the authenticity of the test.

[0064] According to an embodiment of this application, another aspect provides a vibration testing device, including a vibration table and the above-mentioned circuit board vibration testing fixture, wherein the first connecting part 11, the second connecting part 21 and the third connecting part 41 are adapted to be detachably connected to the vibration table.

[0065] In this embodiment, since the vibration testing equipment includes a vibration testing fixture and has the same technical effect as the vibration testing fixture, it will not be described in detail here.

[0066] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A circuit board vibration testing fixture, characterized in that, include: The first plate (1) has a first connecting part (11); The second plate (2) is perpendicular to the first plate (1), and the second plate (2) has a second connecting part (21). The third plate (3) is perpendicular to both the first plate (1) and the second plate (2), and the third plate (3) is connected to both the first plate (1) and the second plate (2); A fixing plate (4) is arranged parallel to the third plate body (3). The fixing plate (4) is connected to the third plate body (3). The fixing plate (4) has a third connecting part (41), a connecting post (42) and a plurality of connecting holes (43). At least some of the connecting holes (43) are detachably connected to the connecting post (42). The connecting post (42) is located on the side of the fixing plate (4) away from the third plate body (3). The connecting post (42) is used to connect to the circuit board (7).

2. The circuit board vibration testing fixture according to claim 1, characterized in that, The fixing plate (4) is provided with a first heating element (44).

3. The circuit board vibration testing fixture according to claim 2, characterized in that, It also includes a controller. There are multiple first heating elements (44), which are evenly distributed on the fixed plate (4) and are electrically connected to the controller.

4. The circuit board vibration testing fixture according to claim 3, characterized in that, Multiple first heating elements (44) are fixedly disposed on the side of the fixed plate (4) away from the third plate (3).

5. The circuit board vibration testing fixture according to any one of claims 1 to 4, characterized in that, It also includes a heating plate (5), which is spaced apart from the fixing plate (4). The heating plate (5) and the fixing plate (4) are detachably connected. The heating plate (5) and the circuit board (7) on the fixing plate (4) are spaced apart. The circuit board (7) is located between the heating plate (5) and the fixing plate (4).

6. The circuit board vibration testing fixture according to claim 5, characterized in that, The heating plate (5) includes a plate body (51) and a plurality of second heating elements (52), which are evenly distributed on the plate body (51).

7. The circuit board vibration testing fixture according to claim 6, characterized in that, Multiple second heating elements (52) are fixedly disposed on the side of the plate body (51) near the fixed plate (4).

8. The circuit board vibration testing fixture according to any one of claims 1 to 4, characterized in that, The fixing plate (4) is fixedly connected to both sides of the third plate (3).

9. The circuit board vibration testing fixture according to any one of claims 1 to 4, characterized in that, The third plate (3) is provided with reinforcing ribs (6) at the connection points with the first plate (1) and the second plate (2).

10. A vibration testing device, characterized in that, include: The circuit board vibration testing fixture as described in any one of claims 1 to 9.

Images