Reliability enhancement test device

Abstract

The invention discloses a reliability enhancement test device, which comprises a test room, a heating and cooling system and a vibration system, wherein the test room is internally provided with a vibration table and is used for at least carrying out cold and thermal shock and vibration environment tests on a tested product loaded on the vibration table; the heating and cooling system is used for changing the temperature in the test room; the vibration table comprises a lower table plate, a middle partition strip and a rigid table top, the rigid table top comprises a top plate, a middle plate and a bottom plate which are sequentially and fixedly connected into a whole from top to bottom, the top plate and the bottom plate are both made of non-metal heat-resisting plates, and the middle plate is made of metal plates. The upper surface of the top plate is configured to be a two-dimensional bearing surface for supporting a tested product; the multiple vibration air hammers can generate simultaneous vibration relative to the X axis, the Y axis and the Z axis of the plane where the upper surface of the top plate is located in the vibration table and one or more tested products loaded on the rigid table top. According to the device of the scheme, the rigid table top of the vibration table is not prone to deformation under the high-temperature condition, and a reliable test result can be provided for a tested product.

Description

Technical Field

[0001] The invention relates to the field of test technology, and in particular to a reliability enhancement test device. Background Art

[0002] When manufacturers develop new products, they often need to test their stress tolerance. Stress testing can ensure the reliability of products in complex environments, such as electronic components and electromechanical products.

[0003] In the prior art, stress test schemes mainly include: the first type of test scheme, which involves stress testing of products by subjecting them to rapid and extreme temperature changes, such as changing the temperature of the tested product at a rate of 10°C per minute within a temperature change range of -100°C to 200°C. The second type of test scheme, which is carried out by mounting the tested product on a rigid tabletop of a vibration table and vibrating the rigid tabletop with multiple vibrating air hammers of the vibration table at the same time. The third type of test scheme, also known as the ultra-high stress test scheme for reliability enhancement tests, is carried out by subjecting the tested product to rapid and extreme temperature and humidity single or combined changes while superimposing vibrating air hammer vibrations.

[0004] In the third type of test scheme mentioned above, the vibration table needs to be able to withstand extreme and rapid changes in temperature and humidity, and also needs to be able to accurately and timely transmit the high, medium and low frequency vibration energy generated by the vibration air hammer to the tested product loaded on the surface of the vibration table.

[0005] In reliability enhancement test equipment, the vibration table is very easy to deform when the temperature changes rapidly and extremely, and the deformed vibration table is difficult to recover when it returns to normal temperature. The deformation of the vibration table during use will affect the transmission of vibration energy, thereby causing the reliability enhancement test results to deviate from the actual results. Summary of the invention

[0006] In order to solve the above technical problems, an object of the present invention is to provide a reliability enhancement test device, the vibration table of which is not easily deformed when the temperature changes rapidly and extremely.

[0007] To this end, the present invention provides a reliability enhancement test device, including a test chamber suitable for housing a vibration table and for performing at least cold, hot and vibration tests on one or more tested products loaded on the vibration table, a heating and cooling system and a vibration system for changing the temperature in the test chamber, the vibration table including a lower table plate, a middle spacer and a rigid table top; the vibration system including a plurality of vibrating air hammers; the rigid table top includes a top plate, an intermediate plate and a bottom plate fixedly connected to each other from top to bottom in sequence, the top plate and the bottom plate are both composed of non-metallic heat-resistant plates that can withstand temperature shocks of at least -100°C to 200°C, the intermediate plate is composed of a metal plate, the upper surface of the top plate is constructed as a two-dimensional bearing surface for supporting the one or more tested products; the plurality of vibrating air hammers are connected to the lower surface of the lower table plate at an inclined angle, and the plurality of vibrating air hammers can generate simultaneous vibrations of the X, Y and Z axes relative to the plane where the upper surface of the top plate is located in the vibration table and the one or more tested products loaded on the rigid table top.

[0008] In the above technical solution, preferably, the non-metallic heat-resistant plate material is an inorganic fiberboard, and the compressive strength of the inorganic fiberboard is greater than or equal to 300 MPa, the tensile strength is greater than or equal to 250 MPa, and the elastic modulus is greater than or equal to 20 GPa.

[0009] In the above technical solution, preferably, the rigid table top also includes a first adhesive layer located between the top plate and the middle plate and a second adhesive layer located between the bottom plate and the middle plate, the first adhesive layer provides bonding force between the top plate and the middle plate, and the second adhesive layer provides bonding force between the bottom plate and the middle plate.

[0010] In the above technical solution, preferably, the first and second adhesive layers are formed by curing a resin adhesive that can at least withstand a temperature shock of -100°C to 200°C.

[0011] In the above technical solution, preferably, the bonding strength of the resin adhesive is greater than or equal to 300 MPa, and the elastic modulus is greater than or equal to 20 GPa.

[0012] In the above technical solution, preferably, the top plate and the bottom plate have the same thickness.

[0013] In the above technical solution, preferably, the thickness ratio of the bottom plate, the middle plate and the top plate is 1:4.5-5.5:1.

[0014] In the above technical solution, preferably, the middle plate is a metal aluminum plate.

[0015] In the above technical solution, preferably, the thickness of the middle plate is 8~35mm.

[0016] In the above technical solution, preferably, a plurality of fixing components are provided on the rigid table top, and the plurality of fixing components are configured to fix the one or more tested products on the upper surface of the top plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging the top plate and bottom plate composed of non-metallic heat-resistant plate on the upper and lower sides of the middle plate composed of metal plate, respectively, when the rigid table is subjected to rapid and extreme temperature changes, the top plate and bottom plate can inhibit the upward and downward deformation of the middle plate under high temperature, so that the shape of the middle plate under high temperature conditions remains basically unchanged, so that the upper surface of the top plate will not deform, thereby the high, medium and low frequency vibration energy applied by the vibration air hammer can be accurately and timely transmitted to one or more tested products loaded on the upper surface of the top plate. Therefore, the reliability enhancement test device of this case can provide reliable test results for the tested products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the internal structure of a reliability enhancement test device according to an embodiment of the present application; Figure 2 is a schematic diagram of a vibration table according to an embodiment of the present application; Figure 3 yes Figure 2 Cross-section along the AA direction.

[0019] Among them: 100, reliability enhancement test device; 1, box body; 2, vibration table; 3, door body; 11, test room; 21, rigid table top; 22, vibration air hammer; 24, lower platform bar; 25, middle spacer bar; 211, top plate; 212, first adhesive layer; 213, middle plate; 214, second adhesive layer; 215, bottom plate; 23, fixing components. DETAILED DESCRIPTION

[0020] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0021] See also Figure 1 , Figure 2, which shows an example of a reliability enhancement test device of the present application. The hardware architecture of the reliability enhancement test device 100 is mainly composed of a box 1, a vibration table 2, a door body 3, an electrical and pneumatic system, a heating and cooling system, a humidification system, a vibration system and other main parts.

[0022] The box body 1 is mainly composed of a box body steel frame, a box body liner, a box body shell and a box body polyurethane foam layer, etc. A test chamber 11 is arranged inside the box body 1 in this example.

[0023] like Figure 2 As shown, the vibration table 2 is installed in the test room 11, and the vibration table 2 includes a rigid table top 21, a lower table top 24 and a middle spacer 25. The vibration system includes a plurality of vibration air hammers 22 installed at the lower part of the vibration table 2. These vibration air hammers 22 are connected to the lower surface of the lower table top 24 at an inclined angle. The plurality of vibration air hammers 22 can generate simultaneous vibrations of the X, Y and Z axes relative to the plane where the upper surface of the rigid table top 21 is located in the rigid table top 21 and one or more tested products (not shown in the figure) loaded thereon.

[0024] The electrical and pneumatic system will be installed on the box 1. The electrical part of the electrical and pneumatic system is mainly used to execute the instructions of the host computer to control the electrical proportional valve, and through the electrical proportional valve, the precision pressure reducing valve outputs the required air pressure, thereby controlling the acceleration value of the vibration table 2 in real time. The pneumatic system of the electrical and pneumatic system is connected to the intake and exhaust pipes of multiple vibrating air hammers 22. The pneumatic system consists of an intake pipeline, an air filter, a pressure reducing valve, an electrical proportional valve, a precision pressure reducing valve, an oil mist collector, an air supply pipeline, an air return pipeline, an air collection bag, an exhaust cleaner, etc.

[0025] The heating and cooling system is installed on the box body 1 or installed independently of the box body 1. The heating and cooling system is constructed to selectively change the temperature of the test chamber 11 and one or more products to be tested loaded on the vibration table 2. In a typical example of a heating and cooling system, the heating and cooling system includes one or more electric heaters and refrigeration devices. The test operator controls the one or more electric heaters and refrigeration devices to adjust the temperature of the test chamber 11 to the target temperature, such as heating to 200°C or cooling to minus 100°C. One or more electric heaters and refrigeration devices can use conventional devices that can reach the required test temperature, which will not be described here.

[0026] like Figure 3 As shown, the rigid table top 21 includes a top plate 211, a middle plate 213 and a bottom plate 215 which are fixedly connected in sequence from top to bottom; wherein a first adhesive layer 212 is arranged between the top plate 211 and the middle plate 213, and a second adhesive layer 214 is arranged between the middle plate 213 and the bottom plate 215.

[0027] The top plate 211 and the bottom plate 215 are both made of non-metallic heat-resistant sheet materials. For example, the non-metallic heat-resistant sheet material can be selected as an inorganic fiberboard, which can at least withstand a temperature shock of -100°C to 200°C and should have a strong strength and elastic modulus, such as: selecting an inorganic fiberboard with a compressive strength greater than or equal to 300MPa, a tensile strength greater than or equal to 250MPa, and an elastic modulus greater than or equal to 20GPa. The middle plate 213 is made of a metal material. For example, it can be a metal aluminum plate.

[0028] The first adhesive layer 212 and the second adhesive layer 214 are cured by a resin adhesive that can withstand a temperature shock of at least -100°C to 200°C; the resin adhesive can meet the bonding requirements of metal plates and non-metal plates, and the adhesive is a high-temperature resistant adhesive that will not dissolve or crack when the ambient temperature is 200°C; the resin adhesive has extremely strong bonding strength and elastic modulus after curing, for example, a resin adhesive with a bonding strength greater than or equal to 300MPa and an elastic modulus greater than or equal to 20GPa is selected. After curing, the first adhesive layer 212 will provide reliable bonding between the top plate 211 and the middle plate 213, and the second adhesive layer 214 will provide reliable bonding between the bottom plate 215 and the middle plate 213.

[0029] The upper surface 2111 of the top plate 211 is constructed as a two-dimensional bearing surface for supporting one or more tested products. In order to temporarily fix one or more tested products on the two-dimensional bearing surface of the rigid table 21, a plurality of fixing members 23 are provided on the rigid table 21, through which one or more tested products can be fixed on the upper surface 2111 of the top plate 211. The fixing members 23 can be threaded fastening components or other components that can fix one or more tested products on the two-dimensional bearing surface. These fixing members 23 need to be removed when the tested products are formally fixed.

[0030] In the present application, the top plate 211 and the bottom plate 215 have the same thickness; thus, when the rigid table top 21 is subjected to rapid and extreme temperature changes, the top plate 211 and the bottom plate 215 can suppress the upward and downward deformation of the middle plate 213 at high temperatures; the top plate 211 and the bottom plate 215 have the same thickness, so that the suppression effect is balanced up and down, thereby achieving the shape of the middle plate of the rigid table top 21 basically unchanged under high temperature conditions, so that the upper surface 2111 of the top plate 11 will not be deformed.

[0031] In a specific embodiment, the thickness ratio of the bottom plate 215, the middle plate 213 and the top plate 211 is 1:4.5-5.5:1. The thickness of the middle plate is preferably 8-35 mm. In a typical rigid tabletop embodiment, the bottom plate 215 is 6 mm, the middle plate 213 is 30 mm, and the top plate 211 is 6 mm.

[0032] A plurality of vibrating air hammers 22 are connected to the lower surface of the lower platen at an inclined angle. The plurality of vibrating air hammers 22 can generate simultaneous vibrations in the rigid table 21 and one or more tested products loaded thereon in the X, Y and Z axes relative to the plane where the upper surface 211 of the top plate 211 is located; and because the rigid table 21 will not be deformed under high temperature conditions, the actual accelerations of the plurality of vibrating air hammers 22 in the X, Y and Z axes will be consistent with the pre-acceleration, so that the test device can provide the desired test conditions.

[0033] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A reliability enhancement test device, comprising a test chamber suitable for housing a vibration table and for performing at least cold, hot and vibration tests on one or more tested products loaded on the vibration table, a heating and cooling system and a vibration system for changing the temperature in the test chamber, wherein the vibration table comprises a lower plate, a middle spacer and a rigid table top; the vibration system comprises a plurality of vibrating air hammers; characterized in that: The rigid table top includes a top plate, an intermediate plate and a bottom plate which are fixedly connected to each other in sequence from top to bottom. Both the top plate and the bottom plate are made of non-metallic heat-resistant plates that can withstand temperature shocks of at least -100°C to 200°C. The intermediate plate is made of metal plates. The upper surface of the top plate is constructed as a two-dimensional bearing surface for supporting the one or more tested products. The multiple vibrating air hammers are connected to the lower surface of the lower table top at an inclined angle. The multiple vibrating air hammers can generate simultaneous vibrations of the X, Y and Z axes relative to the plane where the upper surface of the top plate is located in the vibration table and the one or more tested products loaded on the rigid table top.

2. The reliability enhancement test device according to claim 1, characterized in that: The non-metallic heat-resistant plate material is an inorganic fiberboard, and the compressive strength of the inorganic fiberboard is greater than or equal to 300 MPa, the tensile strength is greater than or equal to 250 MPa, and the elastic modulus is greater than or equal to 20 GPa.

3. The reliability enhancement test device according to claim 1 or 2, characterized in that: The rigid table top also includes a first adhesive layer located between the top plate and the middle plate and a second adhesive layer located between the bottom plate and the middle plate, wherein the first adhesive layer provides adhesive force between the top plate and the middle plate, and the second adhesive layer provides adhesive force between the bottom plate and the middle plate.

4. The reliability enhancement test device according to claim 3, characterized in that: The first and second adhesive layers are formed by curing a resin adhesive which can at least withstand a temperature shock of -100°C to 200°C.

5. The reliability enhancement test device according to claim 3, characterized in that: The resin adhesive has a bonding strength greater than or equal to 300 MPa, and an elastic modulus greater than or equal to 20 GPa.

6. The reliability enhancement test device according to claim 1, characterized in that: The top plate and the bottom plate have the same thickness.

7. The reliability enhancement test device according to claim 6, characterized in that: The thickness ratio of the bottom plate, the middle plate and the top plate is 1:4.5-5.5:

1.

8. The reliability enhancement test device according to claim 6, characterized in that: The middle plate is a metal aluminum plate.

9. The reliability enhancement test device according to claim 8, characterized in that: The thickness of the intermediate plate is 8-35 mm.

10. The reliability enhancement test device according to claim 1, characterized in that: A plurality of fixing components are provided on the rigid table top, and the plurality of fixing components are configured to fix the one or more tested products on the upper surface of the top plate.

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