Constant acceleration test clamp based on beam type isolation structure and use method

Abstract

The invention discloses a constant acceleration test fixture based on a beam type isolation structure and a use method, and belongs to the technical field of electronic device testing. The constant acceleration test fixture comprises a fixture upper body, a fixture lower body and an isolation cross beam; an inner cavity is formed in the surface of the lower clamp body, a plurality of isolation columns are arranged in the inner cavity, the same first intervals are formed between the isolation columns in the width direction of the lower clamp body, and the same second intervals are formed between the isolation columns in the length direction of the lower clamp body. The isolation cross beam is installed in the second intervals and penetrates through the second intervals located in the same straight line direction to form partitions, the partitions are matched with the first intervals to form a plurality of circuit placement areas, the two ends of the isolation cross beam are connected with the inner wall of the inner cavity, the bottom of the upper clamp body is installed at the top of the lower clamp body, and a circuit lead is arranged in the upper clamp body. According to the invention, the problem of friction damage caused by direct contact between circuits in a constant acceleration test in the prior art can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic device testing, and particularly relates to a constant acceleration test fixture based on a beam isolation structure and a using method thereof. Background Art

[0002] In the reliability testing of electronic devices, the constant acceleration test simulates the mechanical environment during the actual use of the devices, and is of great significance for evaluating the durability, stability and potential failure modes of the devices. As a common component in electronic systems, the ceramic dual in-line circuit is vulnerable to damage under a constant acceleration environment due to its structural characteristics and material properties.

[0003] Currently, when a ceramic dual in-line circuit is subjected to a constant acceleration test, a dual in-line general fixture is commonly used for fixing, and a slot type design is usually adopted to enable the circuit to slowly slide into the fixture interior in sequence. However, this fixing method has obvious defects. Since the ceramic parts between the circuits are in direct contact, when a constant acceleration test is carried out, due to the continuous action of the acceleration, relative movement or micro-vibration will occur between the circuits, resulting in mutual friction of the ceramic parts. Long-term friction will not only reduce the surface finish of the ceramics, but may also cause peeling or cracking of the ceramic material, that is, the "ceramic chipping" problem. Ceramic chipping not only affects the appearance quality of the circuit, but may also damage the electrical performance of the circuit, leading to device failure.

[0004] Therefore, there is an urgent need for a constant acceleration test fixture structure that can effectively isolate the direct contact between circuits and avoid frictional damage. Summary of the Invention

[0005] The purpose of the present invention is to provide a constant acceleration test fixture based on a beam isolation structure and a using method thereof, so as to solve the problem of frictional damage caused by direct contact between circuits during a constant acceleration test in the prior art.

[0006] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, a constant acceleration test fixture based on a beam isolation structure includes: an upper fixture body, a lower fixture body, and an isolation cross beam; An inner cavity is provided on the surface of the lower fixture body, and a plurality of isolation columns are arranged in the inner cavity. The plurality of isolation columns have the same first interval along the width direction of the lower fixture body, and the plurality of isolation columns have the same second interval along the length direction of the lower fixture body. The isolation cross beam is installed in the second interval and penetrates through a plurality of the second intervals in the same straight line direction to form a partition. The partition cooperates with the first interval to form a plurality of circuit placement areas. Both ends of the isolation cross beam are connected to the inner wall of the inner cavity. The bottom of the upper fixture body is installed on the top of the lower fixture body, and circuit leads are arranged inside the upper fixture body.

[0007] In some embodiments, the isolation crossbeam is an anti-static rubber gasket, and the anti-static rubber gasket fills the second interval.

[0008] In some embodiments, rounded corners are provided at the right-angle positions of the isolation columns corresponding to the ceramic dual in-line circuit.

[0009] In some embodiments, a plurality of lead protection cavities are provided on the upper body of the fixture, circuit leads are arranged in the lead protection cavities, and each lead protection cavity corresponds to the position of the circuit placement area.

[0010] In some embodiments, the length of each lead protection cavity is greater than the total length of the circuit placement area in the same straight-line direction.

[0011] In some embodiments, the lead protection cavity penetrates through the top and bottom of the upper body of the fixture.

[0012] In some embodiments, positioning pins are provided at the bottom of the upper body of the fixture, and positioning holes are provided at the top of the lower body of the fixture corresponding to the positions of the positioning pins. During use, the upper body of the fixture is installed on the lower body of the fixture by inserting the positioning pins into the positioning holes.

[0013] In some embodiments, two rows of isolation columns are arranged in the inner cavity along the width direction of the lower body of the fixture, and three isolation columns are arranged in each row.

[0014] In some embodiments, rounded corners are provided at the right-angle positions of the inner wall of the inner cavity corresponding to the ceramic dual in-line circuit.

[0015] In a second aspect, a method for using a constant acceleration test fixture based on a beam-type isolation structure includes the following steps: Place the anti-static rubber gasket in the second interval of the inner cavity of the lower body of the fixture and fill it to form a partition; Then place the ceramic dual in-line circuit into the circuit placement area in the inner cavity of the lower body of the fixture, and install the leads of the ceramic dual in-line circuit in the lead protection cavities of the upper body of the fixture; Finally, insert the positioning pins at the bottom of the upper body of the fixture into the positioning holes at the top of the lower body of the fixture, complete the installation of the fixture, and place the installed fixture into a constant acceleration testing machine for testing.

[0016] Compared with the prior art, the present invention has the following beneficial effects: Through the designed isolation crossbeam and precisely spaced isolation columns, this fixture can provide stable support and effective electrical isolation for devices such as ceramic dual-in-line circuits. This structure reduces errors caused by external interference or mutual influence between devices during the test, improving the accuracy and reliability of test data. The isolation columns and the inner wall of the inner cavity in the fixture are provided with rounded corners at the right-angle positions of the ceramic dual-in-line circuit, which can effectively avoid damage to the device due to stress concentration during installation or testing, protect the integrity of the device, and thus ensure the accuracy of the test results. By setting the isolation crossbeam and isolation columns, a circuit placement area is formed, which can effectively isolate each circuit module, avoid frictional damage caused by mutual contact during the constant acceleration test, and this structure ensures that the circuit is only stressed in one direction during the test, enabling a more accurate simulation of the constant acceleration environment. Through the beam-type isolation structure of the isolation crossbeam, this invention can effectively reduce non-loaded surface damage caused by frictional extrusion during the constant acceleration test, avoid porcelain chipping, and improve the product yield rate.

[0017] Furthermore, this invention uses an anti-static rubber gasket as the isolation crossbeam, which can not only provide good electrical isolation but also has a buffering effect, reducing damage to the non-loaded surface of the circuit during the test.

[0018] Furthermore, the isolation columns and the inner wall of the inner cavity in this invention are provided with rounded corners at the right-angle positions corresponding to the ceramic dual-in-line circuit, which can avoid scratches on the circuit caused by sharp corners.

[0019] Furthermore, this invention sets a lead protection inner cavity in the upper body of the fixture for placing and protecting circuit leads, which can avoid damage to the leads due to extrusion or pulling during the test. The lead protection inner cavity runs through the top and bottom of the upper body of the fixture. Compared with the closed fixture design on the market, the upper body of this fixture runs through the top and bottom of the upper body of the fixture, which actually adopts a through-body cavity groove design, enabling the tester to directly observe the state changes of the device before and after the test. This openness not only facilitates quickly checking whether the device is correctly installed but also can immediately detect abnormalities (such as fractures) of the device during the test, providing first-hand original state information for test analysis and helping to more accurately judge the cause of the failure. In a high-speed or high-acceleration environment, the device may fail due to extreme stress, such as fractures. This invention provides a fixture that can immediately capture the most original state of such a failure, avoiding secondary damage that may be caused by traditional fixtures when removing the device, and providing valuable data for failure analysis and design improvement.

[0020] Furthermore, this invention realizes quick and accurate installation and disassembly through the cooperation of the positioning pins and the positioning holes on the lower body of the fixture. This design simplifies the test preparation process, improves work efficiency, and reduces safety hazards during operation. Description of the Drawings

[0021] Figure 1 The three - view drawings of the lower body of the fixture provided for the first embodiment, where (a) is the front view of the lower body of the fixture, (b) is the left view of the lower body of the fixture, and (c) is the top view of the lower body of the fixture; Figure 2 The three - dimensional drawing of the lower body of the fixture provided for the first embodiment; Figure 3 The three - view drawings of the upper body of the fixture provided for the first embodiment; where (a) is the front view of the upper body of the fixture, (b) is the left view of the upper body of the fixture, and (c) is the top view of the lower body of the fixture; Figure 4 The three - dimensional drawing of the upper body of the fixture provided for the first embodiment; Figure 5 The three - view drawings of the isolation cross - beam provided for the first embodiment, where (a) is the front view of the isolation cross - beam, (b) is the left view of the isolation cross - beam, and (c) is the top view of the isolation cross - beam; Figure 6 The three - dimensional drawing of the isolation cross - beam provided for the first embodiment; Figure 7 The first schematic diagram of the assembly of the constant - acceleration test fixture based on the beam - type isolation structure provided for the first embodiment; Figure 8 The second schematic diagram of the assembly of the constant - acceleration test fixture based on the beam - type isolation structure provided for the first embodiment.

[0022] In the figure, 1. upper body of the fixture; 2. lower body of the fixture; 3. isolation cross - beam; 4. isolation column; 5. lead protection inner cavity. Detailed implementation manners

[0023] In the following, only some exemplary embodiments are simply described. Without departing from the spirit or scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0026] In the present invention, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be a direct connection or an indirect connection through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] This embodiment provides a constant acceleration test fixture based on a beam isolation structure, including: a fixture upper body 1, a fixture lower body 2, and an isolation cross beam 3; The fixture lower body 1 is the basic part of the entire fixture, and an inner cavity is provided on the surface. This inner cavity is machined according to the main body width and length of the ceramic dual in-line circuit and can accommodate a plurality of circuit modules; As Figure 1 and Figure 2 shown, in the inner cavity, two rows of isolation columns 4 are arranged along the width direction of the fixture lower body 2, and three isolation columns 4 are arranged in each row. There is the same first interval between these isolation columns 4 along the width direction of the fixture lower body 2 to ensure the effective isolation of the circuit modules in the width direction. At the same time, there is the same second interval between the isolation columns 4 along the length direction of the fixture lower body 2 to provide space for the installation of the isolation cross beam 3; Since stress concentration is likely to occur at the right-angle positions of the ceramic dual in-line circuit under stress, resulting in chipping or damage, rounded corners are provided at the positions of the isolation columns 4 corresponding to the right-angle positions of the ceramic dual in-line circuit, which can effectively disperse stress and avoid stress concentration at the right-angle positions. Rounded corners are also provided on the inner wall of the inner cavity of the fixture lower body 2 corresponding to the right-angle positions of the ceramic dual in-line circuit to avoid friction of the ceramic dual in-line circuit.

[0029] As Figure 5 and Figure 6As shown, the isolation crossbeam 3 uses an anti-static rubber gasket, which fills the second interval to form an effective partition. The isolation crossbeam 3 penetrates the second intervals in the same straight line direction and cooperates with the first interval to form circuit placement areas. These circuit placement areas are independent of each other. The anti-static rubber gasket has good electrical insulation performance and buffering performance, which can effectively isolate the electrical interference between circuit modules and play a buffering role when stressed, reducing damage to circuit modules.

[0030] As Figure 3 and Figure 4 shown, the upper fixture body 1 is the top part of the fixture, which closely cooperates with the lower fixture body 2 to jointly fix and protect the circuit under test. Six lead protection cavities 5 are provided on the upper fixture body 1, and circuit leads are placed in these lead protection cavities 5. Every two lead protection cavities 5 correspond to a row of circuit placement areas to ensure the orderly arrangement and protection of the leads. To ensure that the leads will not be damaged by extrusion or pulling during the test, the length of each lead protection cavity 5 is greater than the total length of the circuit placement areas in the same straight line direction, which can provide enough space to accommodate the leads and ensure the safety and reliability of the leads.

[0031] To facilitate the quick and accurate positioning and installation of the upper fixture body 1 and the lower fixture body 2, as Figure 7 and Figure 8 shown, positioning pins are provided at the bottom of the upper fixture body 1, and corresponding positioning holes are provided at the top of the lower fixture body 2. During use, just insert the positioning pins into the positioning holes to complete the installation of the fixture. The number of fixtures and the number of devices placed in the symmetry plane (i.e., the inner cavity of the lower fixture body 2) of the fixture provided by the embodiment are kept consistent during the test. Inconsistency is likely to cause damage to the machine. The embodiment can maintain balance during centrifugal motion.

[0032] The constant acceleration test fixture based on the beam-type isolation structure provided in this embodiment, after the circuit under test is placed in the circuit placement area of the lower fixture body 2, the upper fixture body 1 is closely fitted with the lower fixture body through positioning pins and positioning holes. At this time, the isolation cross beam 3 (anti-static rubber gasket) plays a role in isolating circuit modules and preventing mutual interference. At the same time, the lead protection inner cavity 5 protects the safety and reliability of the circuit leads. During the constant acceleration test, the fixture can firmly fix the circuit under test and provide effective protection. For the fixtures on the market, except for the inlets and outlets where the devices are placed into the fixture, the other parts are closed, which is not conducive to determining the number of devices placed in the symmetry plane (i.e., the inner cavity of the lower fixture body 2). Usually, to determine the number of devices in the fixture in the symmetry plane, weighing is used. The fixtures on the market are heavier than the fixture of this embodiment, which places a heavier burden on the test machine shaft and causes more serious wear. The lead protection inner cavity 5 in the upper fixture body 1 of this embodiment adopts the design of a through-body cavity groove, which is convenient for observing the state of the devices in the tooling before and after the test, and has the function of being convenient and fast. Moreover, if a device breaks into two halves, the original state can be immediately and accurately captured, which is helpful for the accuracy of test analysis. For the fixtures on the market, the devices need to be slowly moved out to observe the problems. If it is proved that the device has problems, the original state will be damaged, which is not conducive to test analysis.

[0033] In summary, the constant acceleration test fixture provided in this embodiment has the following advantages: (1) The fixture adopts a beam-type isolation structure, effectively isolating the mutual interference and collision between circuit modules and improving the accuracy of the test. At the same time, the use of the anti-static rubber gasket also reduces the influence of electrical interference on the test results.

[0034] (2) The fillet design in the fixture and the use of the anti-static rubber gasket effectively disperse the stress, avoiding the stress concentration at the right-angle positions and the damage of the circuit modules. At the same time, the design of the lead protection inner cavity also protects the safety and reliability of the circuit leads.

[0035] (3) The upper fixture body and the lower fixture body are quickly and accurately positioned and installed through positioning pins and positioning holes, greatly improving the work efficiency.

[0036] Embodiment 2 Based on Embodiment 1, this embodiment provides a method for using the constant acceleration test fixture based on the beam-type isolation structure, including the following steps: Before installing the fixture, it is first necessary to prepare the anti-static rubber gasket. The anti-static rubber gasket can effectively isolate the direct contact between the ceramic dual-in-line circuit and the metal part of the fixture, preventing electrostatic discharge from damaging the circuit. At the same time, the elasticity of the rubber gasket can also absorb the vibration during the test to a certain extent, improving the accuracy of the test.

[0037] Cut the anti-static rubber gasket according to the shape and size of the second interval in the inner cavity of the lower fixture body 2 to ensure that the gasket can completely and tightly fill the second interval, forming an effective partition, which can reduce the influence of external interference on the test results and reduce the frictional damage between circuits.

[0038] After the anti-static rubber gasket is placed, place the ceramic dual-in-line circuit in the circuit placement area in the inner cavity of the lower fixture body 2. The circuit placement area ensures that the ceramic dual-in-line circuit can be placed stably and without shaking to avoid additional stress or deformation during the test due to improper position. During installation, the operator needs to wear an anti-static wristband to prevent the potential threat of human static electricity to the ceramic dual-in-line circuit. At the same time, a special tool or finger should be used to gently place the circuit into the placement area to avoid damaging the circuit due to excessive force.

[0039] After the ceramic dual-in-line circuit is placed in place, install its leads into the lead protection inner cavity 5 of the upper fixture body 1. The lead protection inner cavity 5 fully considers the routing and fixing method of the leads to ensure that the leads will not be displaced or bent due to changes in acceleration during the test, thus affecting the accuracy of the test results. When installing the leads, each lead should be placed into the lead protection inner cavity 5 along the predetermined path for fixing. The force during fixing should be moderate, ensuring both the stability of the leads and avoiding deformation or damage to the leads caused by excessive pressing.

[0040] When the ceramic dual-in-line circuit and its leads are both installed, connect the upper fixture body 1 and the lower fixture body 2. Align the positioning pins of the upper fixture body 1 with the positioning holes at the top of the lower fixture body 2, and then gently press down until the positioning pins are completely inserted into the positioning holes. During this process, the fixture should be kept stable to avoid shaking or tilting, so as not to affect the connection quality of the fixture and the accuracy of the test.

[0041] Finally, place the installed fixture stably into the test chamber of the constant acceleration test machine to ensure that the force direction of the ceramic dual-in-line circuit and its leads is consistent with the acceleration direction applied by the test machine, so as to avoid test errors caused by improper direction.

[0042] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or equivalent to the scope of the present invention are encompassed by the present invention.

Claims

1. A constant acceleration test fixture based on a beam isolation structure, characterized in that: include: A clamp upper body (1), a clamp lower body (2), and an isolation beam (3); An inner cavity is arranged on the surface of the clamp lower body (2), and a plurality of isolation columns (4) are arranged in the inner cavity. The plurality of isolation columns (4) have the same first spacing along the width direction of the clamp lower body (2), and the plurality of isolation columns (4) and the isolation columns (4) and the inner wall of the inner cavity have the same second spacing along the length direction of the clamp lower body (2). An isolation beam (3) is installed in the second spacing and penetrates through the plurality of second spacings located in the same straight line direction to form a partition. The partition cooperates with the first spacing to form a plurality of circuit placement areas. The two ends of the isolation beam (3) are connected to the inner wall of the inner cavity. The bottom of the clamp upper body (1) is installed on the top of the clamp lower body (2), and circuit leads are arranged inside the clamp upper body (1).

2. A constant acceleration test fixture based on a beam isolation structure according to claim 1, characterized in that: The isolation crossbeam (3) is an antistatic rubber gasket, and the antistatic rubber gasket fills the second space.

3. The constant acceleration test fixture based on a beam isolation structure according to claim 1, characterized in that: A rounded corner is provided on the isolation column (4) at a right angle position corresponding to the ceramic double-row circuit.

4. The constant acceleration test fixture based on a beam isolation structure according to claim 2, characterized in that: A plurality of lead wire protection inner cavities (5) are arranged on the upper body (1) of the clamp, and circuit leads are arranged in the lead wire protection inner cavities (5), and each lead wire protection inner cavity (5) corresponds to the position of the circuit placement area.

5. The constant acceleration test fixture based on a beam-type isolation structure according to claim 4, characterized in that: The length of each lead protection inner cavity (5) is greater than the total length of the circuit placement area in the same straight line direction.

6. The constant acceleration test fixture based on a beam isolation structure according to claim 4, characterized in that: The lead protection inner cavity (5) passes through the top and bottom of the clamp upper body (1).

7. The constant acceleration test fixture based on a beam isolation structure according to claim 4, characterized in that: A positioning pin is provided at the bottom of the clamp upper body (1), and a positioning hole is provided at the top of the clamp lower body (2) corresponding to the position of the positioning pin. When in use, the clamp upper body (1) is installed on the clamp lower body (2) by inserting the positioning pin into the positioning hole.

8. The constant acceleration test fixture based on a beam isolation structure according to claim 1, characterized in that: Two rows of isolation columns (4) are arranged in the inner cavity along the width direction of the clamp lower body (2), with three isolation columns (4) arranged in each row.

9. The constant acceleration test fixture based on a beam-type isolation structure according to claim 1, characterized in that: The inner wall of the inner cavity is provided with a rounded corner at a right angle position corresponding to the ceramic double-row circuit.

10. A method for using a constant acceleration test fixture based on a beam-type isolation structure, characterized in that: The constant acceleration test fixture according to claim 7 comprises the following steps: Placing an antistatic rubber gasket in the second compartment of the inner cavity of the clamp lower body (2) and filling it up to form a partition; Then, the ceramic double-row circuit is placed in the circuit placement area in the inner cavity of the lower body (2) of the fixture, and the leads of the ceramic double-row circuit are installed in the lead protection inner cavity (5) of the upper body (1) of the fixture; Finally, the positioning pin at the bottom of the clamp upper body (1) is inserted into the positioning hole at the top of the clamp lower body (2), and the clamp installation is completed. The installed clamp is placed in a constant acceleration testing machine for testing.

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