Universal vibration tool for improving vibration screening efficiency of printed boards and use method

Abstract

The invention discloses a universal vibration tool for improving the vibration screening efficiency of a printed board and a use method, and belongs to the technical field of test equipment for environment stress screening (vibration screening) of the printed board. A mounting frame of the tool is horizontally arranged, two ends of the mounting frame are respectively and fixedly provided with a fixing plate, and the two fixing plates are opposite and parallel. And the two movable plates are arranged in parallel in a back-to-back manner, are fixed in the mounting frame in a displaceable manner and are positioned between the two fixed plates. A plurality of slots are horizontally formed in one side, facing the mounting frame, of the fixed plate, and same slots are formed in one side, facing the slots of the fixed plate, of the movable plate. And one fixed plate and one movable plate which are opposite to the slots form a group and are matched with each other, and a printed board is horizontally inserted between the fixed plate and the movable plate. The tool is installed on a vibration table top, and vibration screening of two sets of multiple printed boards of different specifications and sizes can be carried out at the same time. The position of the moving plate is adjusted to adapt to printed boards of different sizes, and universality is achieved; the design of the slots improves the number of printed boards which are tested and installed at the same time, and improves the screening efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of test equipment for environmental stress screening (vibration screening) of printed circuit boards, and in particular relates to a universal vibration tooling for improving the vibration screening efficiency of printed circuit boards and a use method thereof. Background Art

[0002] Vibration screening is one of the most effective methods in environmental stress screening. Its purpose is to discover and eliminate early failures caused by defects introduced by bad parts, components, manufacturing processes and other reasons. Printed circuit boards, as the support of electronic components, are widely used in electronic control, with a wide variety of functions and dimensions. Vibration screening of printed circuit boards evaluates the mechanical strength and reliability of printed circuit boards by simulating the vibration conditions that may be encountered in the actual use environment, and screens out unqualified products.

[0003] In the prior art, the printed circuit board is generally fixed to the aluminum plate / steel plate through the holes at the four corners, and then the aluminum plate / steel plate with the printed circuit board is installed on the corresponding tooling for vibration testing. The existing problems are: 1. For printed circuit boards of different sizes, it is necessary to repeatedly punch holes on the aluminum plate / steel plate to fix the two, which is a cumbersome process. 2. The size of the printed circuit boards installed on the tooling in the same batch of tests is single, and printed circuit boards of different specifications and sizes cannot be installed at the same time; and the number of printed circuit boards installed on the tooling in the same batch of tests is relatively small, and generally only 1-3 printed circuit boards can be subjected to vibration tests at the same time, which affects the screening time of the printed circuit boards and prolongs the development cycle. Summary of the invention

[0004] Technical issues to be solved:

[0005] In order to avoid the shortcomings of the prior art, the present invention provides a universal vibration tooling and a method of using the same for improving the efficiency of vibration screening of printed circuit boards. A movable plate with multiple slots is provided to match a fixed plate with multiple slots, and the printed circuit board to be tested is inserted into the slots between the movable plate and the fixed plate. By adjusting the position of the movable plate, the printed circuit board of the corresponding size can be adapted and installed. At the same time, the slot design increases the number of printed circuit boards that can be tested and installed at the same time. This solves the problem that the existing vibration screening tooling for printed circuit boards is not universal, has low screening efficiency, and has a long cycle.

[0006] The technical solution of the present invention is: a universal vibration tooling for improving the vibration screening efficiency of printed circuit boards, comprising: a fixed plate, a movable plate, and a mounting frame;

[0007] The mounting frame is arranged horizontally and is used to support the fixed plate and the movable plate;

[0008] The two fixing plates are arranged facing each other and in parallel, and are respectively fixed vertically at two ends of the installation frame;

[0009] The two movable plates are arranged in back-to-back and parallel positions, and can be displaced and vertically fixed in the installation frame, located between the two fixed plates, and parallel to the fixed plates;

[0010] The fixed plate is horizontally provided with a plurality of concave slots on one side facing the mounting frame; the movable plate is provided with a plurality of slots identical to those of the fixed plate on one side, the slots of the two movable plates are respectively located on the sides facing the slots of the two fixed plates, and the slots of the movable plates are horizontally aligned one by one with the slots of the fixed plates they face;

[0011] The fixed plate and the movable plate opposite to the slot form a group, and a printed circuit board to be tested of a certain specification is horizontally inserted between them. The two ends of the printed circuit board are respectively located in a group of corresponding slots of equal height of the fixed plate and the movable plate of the group; the distance from the movable plate to the fixed plate in the same group is adjustable.

[0012] A further technical solution of the present invention is that the slot width matches the thickness of the printed circuit board.

[0013] A further technical solution of the present invention is: the installation frame includes an upper crossbeam and a lower crossbeam; the two lower crossbeams and the two upper crossbeams are parallel to each other and aligned at both ends to form a rectangular installation frame; the end surfaces of the lower crossbeam are respectively fixedly connected to the lower inner end surfaces of the two fixed plates; the end surfaces of the upper crossbeam are respectively fixedly connected to the upper inner end surfaces of the two fixed plates.

[0014] A further technical solution of the present invention is: mounting plates are fixed on both sides of the movable plate, and the mounting plates are used for detachably fixed connection with the upper crossbeam and the lower crossbeam.

[0015] A further technical solution of the present invention is: nut strips are fixed to the outer sides of the upper crossbeam and the lower crossbeam, and threaded holes matching the nut strips are provided at both ends of the mounting plate for fixing the mounting plate and the nut strips with screws.

[0016] A further technical solution of the present invention is that two threaded holes are provided at both ends of the mounting plate, and the hole spacing is the same as the hole spacing of two adjacent screw holes on the nut strip.

[0017] A further technical solution of the present invention is that the lower end surface of the fixing plate is fixedly connected to the table surface of the vibration test table by bolts.

[0018] The steps for using the universal vibration tool are as follows:

[0019] Step 1. Adjust the installation position of a movable plate so that the spacing between it and the corresponding fixed plate of the same group meets the horizontal insertion of the printed board of the first size specification, and insert the printed board of the first size specification;

[0020] Step 2. Adjust the installation position of another movable plate so that the spacing between it and the corresponding fixed plate of the same group meets the horizontal insertion of the second size specification printed board, and horizontally insert the second size specification printed board;

[0021] Step 3. Install the vibration fixture equipped with the printed circuit board of the first size specification and the printed circuit board of the second size specification on the horizontal vibration table, so that the lower end surfaces of the two fixed plates are tightly fixedly connected to the horizontal vibration table by bolts; and perform a vibration test;

[0022] Step 4. Remove the vibration fixture equipped with the printed circuit board of the first size specification and the printed circuit board of the second size specification from the horizontal vibration table, and reinstall it on the vertical vibration table, so that the lower end surfaces of the two fixing plates are tightly fixed and connected to the vertical vibration table by bolts; and perform a vibration test;

[0023] Complete vibration screening of printed circuit boards of two sizes.

[0024] Beneficial Effects

[0025] The beneficial effects of the present invention are as follows: the universal vibration tooling for improving the vibration screening efficiency of printed circuit boards described in the present invention is provided with two fixed plates and two movable plates, which are supported and fixed by a mounting frame. One movable plate corresponds to one fixed plate as a group, and on the opposite surfaces of the movable plates and the fixed plates of the same group, a plurality of concave slots are correspondingly arranged horizontally, so that multiple printed circuit boards of the same size can be inserted at the same time. The relative slot design of the two groups of movable plates and the fixed plates enables the tooling to simultaneously install two different specifications of printed circuit boards for vibration screening. The number of printed circuit boards to be inserted for testing is based on the use requirements, and is consistent with the number of slots when fully loaded, thereby effectively improving the vibration screening efficiency of the printed circuit boards.

[0026] The distance between the same set of movable plates and fixed plates can be adjusted. By adjusting the connection positions of the mounting plates and nut strips on both sides of the movable plates, the fixed position of the movable plates on the mounting frame can be adjusted, and then the distance between the movable plates and the corresponding fixed plates can be adjusted to suit the installation of printed circuit boards of different sizes. It is universal and avoids the tedious process of punching holes on aluminum plates / steel plates for fixing printed circuit boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front view of the universal vibration tooling structure of the present invention;

[0028] Figure 2 This is an axonometric diagram of the universal vibration tooling structure of the present invention;

[0029] Figure 3 It is a schematic structural diagram of the surface where the slot of the movable plate in the present invention is located;

[0030] Figure 4The diagram is a schematic diagram of installing two sizes of printed circuit boards on the universal vibration tooling of the present invention.

[0031] Explanation of the reference numerals: 1. Fixed plate, 11. Slot of the fixed plate, 2. Moving plate, 21. Slot of the moving plate, 22. Mounting plate, 23. Threaded hole, 3. Mounting frame, 31. Upper beam, 32. Lower beam, 33. Nut strip, 4. Printed board of first size specification, 5. Printed board of second size specification. DETAILED DESCRIPTION

[0032] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] See also Figure 1-4 This embodiment provides a universal vibration tooling and a method of use for improving the vibration screening efficiency of printed circuit boards. The vibration tooling includes two fixed plates 1, two movable plates 2 and a mounting frame 3.

[0035] like Figure 1 , 2 As shown, the mounting frame 3 is horizontally arranged to support the fixed plate 1 and the movable plate 2. Specifically, the mounting frame 3 includes two upper beams 31 and two lower beams 32. The two lower beams 32 and the two upper beams 31 are parallel to each other and aligned at both ends, forming the mounting frame 3 of a rectangular parallelepiped structure.

[0036] The two fixing plates 1 are arranged facing each other and in parallel, and are respectively fixed vertically to the two ends of the mounting frame 3. The fixing plate 1 is a square plate, and its outer dimensions match the dimensions of the ends of the mounting frame 3, so that the upper crossbeam 31 and the lower crossbeam 32 of the mounting frame 3 are respectively located at the four corners of the inner side of the fixing plate 1. The end faces of the lower crossbeam 32 are respectively fixedly connected to the lower inner end faces of the two fixing plates 1 by screws; the end faces of the upper crossbeam 31 are respectively fixedly connected to the upper inner end faces of the two fixing plates 1 by screws.

[0037] The two movable plates 2 are arranged in a back-to-back and parallel manner, and can be displaced and fixed vertically in the mounting frame 3, located between the two fixed plates 1, and parallel to the fixed plates 1. Mounting plates 22 are fixed on both sides of the movable plate 2, and the mounting plates 22 are used to be detachably fixedly connected with the upper crossbeam 31 and the lower crossbeam 32. Specifically, as Figure 1 , 2 As shown, nut strips 33 are fixed to the outer sides of the upper crossbeam 31 and the lower crossbeam 32, and threaded holes 23 matching the nut strips 33 are provided at both ends of the mounting plate 22, which are used to fix the mounting plate 22 and the nut strips 33 by screws, thereby realizing the fixed connection between the movable plate 2 and the mounting frame 3. In order to ensure the stability of the connection, in this embodiment, two threaded holes 23 are provided at both ends of the mounting plate 22, and the hole spacing is the same as the hole spacing of two adjacent screw holes on the nut strips 33. By adjusting the installation positions of the mounting plates 22 on both sides of the movable plate 2 and the installed nut strips 33, the installation position of the movable plate 2 on the mounting frame 3 can be adjusted.

[0038] See also Figure 1 , 2 , a plurality of concave slots are horizontally arranged on the side of the fixed plate 1 facing the mounting frame 3, and a plurality of slots having the same structure as the fixed plate 1 are arranged on the side of the movable plate 2 facing the fixed plate 1. The slot surfaces of the two movable plates 2 face the slot surfaces of the two fixed plates 1 respectively, and the slots 21 of the movable plates are horizontally aligned one by one with the slots 11 of the facing fixed plates. The fixed plate 1 and the movable plate 2 with opposite slots are grouped together to form a group of printed circuit board installation positions. The structure of this embodiment constitutes two groups of printed circuit board installation positions, and the same group of printed circuit board installation positions is used to install printed circuit boards of the same specifications and sizes.

[0039] like Figure 4As shown, a printed board 4 of the first size specification is horizontally installed between a group of fixed plates 1 and a movable plate 2 on the left, and the two ends of the printed board 4 of the first size specification are respectively located in a group of corresponding slots at the same height of the group of fixed plates 1 and movable plates 2. A printed board 5 of the second size specification is horizontally installed between a group of fixed plates 1 and a movable plate 2 on the right, and the two ends of the printed board 5 of the second size specification are respectively located in a group of corresponding slots at the same height of the group of fixed plates 1 and movable plates 2 on the right. The distance between the movable plate 2 and the fixed plate 1 in the same group is adjustable, and the printed boards of corresponding sizes can be adapted and installed by adjusting the spacing, so that the vibration tooling has universality. During the position adjustment process of the movable plate 2, it is necessary to ensure that it is always parallel to the corresponding fixed plate 1 in the same group, and the slot 21 of the movable plate must be kept horizontally aligned with the slot 11 of the corresponding fixed plate. Since the same group of fixed plates 1 and movable plates 2 are provided with multiple slots for installing printed boards from top to bottom, multiple printed boards can be installed at the same time for vibration screening test, which improves the test efficiency and shortens the test time. The number of printed circuit board test insertions is determined according to the actual situation of the installed printed circuit board. For example, if the height of the components welded on the printed circuit board is relatively high, they can be inserted sparsely with a few layers. For example, if the height of the components welded on the printed circuit board is relatively low, they can be inserted densely. When fully loaded, the number of slots is consistent. In this embodiment, the maximum number of printed circuit boards installed at one time is about 32, thereby effectively improving the vibration screening efficiency of the printed circuit board. To ensure the stability of the printed circuit board installation, the slot width of the fixed plate 1 and the movable plate 2 matches the thickness of the printed circuit board to ensure that the printed circuit board can be inserted into the slot.

[0040] Example of use:

[0041] by Figure 4 As shown in the example: the test requires screening of two sizes of printed circuit boards, namely, a first size specification printed circuit board 4 and a second size specification printed circuit board 5, and the vibration screening conditions are: 10 minutes along the two axes parallel to the printed circuit board surface and perpendicular to the printed circuit board surface. The specific method of using the universal vibration tooling of the present invention is as follows:

[0042] Step 1. Adjust the installation dimensions of a group of printed circuit board installation positions on the left side to make them suitable for the installation of the first size specification printed circuit board 4. Specifically, adjust the position of the left movable plate 2 so that the distance between it and the leftmost fixed plate 1 is adapted to the first size specification printed circuit board 4, and then horizontally insert the first size specification printed circuit board 4 into a group of equal height slots of the group of printed circuit board installation positions.

[0043] Step 2. Adjust the installation dimensions of a group of printed circuit board installation positions on the right side to make them suitable for the installation of the second size specification printed circuit board 5. Specifically, adjust the position of the right movable plate 2 so that the distance between it and the rightmost fixed plate 1 is suitable for the second size specification printed circuit board 5, and then horizontally insert the second size specification printed circuit board 5 into a group of equal height slots of the group of printed circuit board installation positions.

[0044] Step 3. Install the vibration fixture equipped with the printed circuit board 4 of the first size specification and the printed circuit board 5 of the second size specification on the horizontal vibration table, so that the lower end surfaces of the two fixed plates 1 are tightly fixed to the horizontal vibration table through bolts; and conduct a vibration test for 10 minutes.

[0045] Step 4. Remove the vibration fixture equipped with the printed circuit board 4 of the first size specification and the printed circuit board 5 of the second size specification from the horizontal vibration table, and reinstall it on the vertical vibration table, so that the lower end surfaces of the two fixed plates 1 are tightly fixed to the vertical vibration table surface by bolts; carry out a vibration test for 10 minutes.

[0046] The vibration screening is now complete.

[0047] The vibration screening tool provided by the present invention is suitable for printed circuit boards of various sizes by adjusting the position of the movable plate 2, has strong versatility, and can simultaneously install multiple printed circuit boards of two sizes for vibration screening, thereby shortening the test time. In particular, for printed circuit boards of non-standard sizes and small batches, the vibration screening efficiency is improved.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A universal vibration tool for improving the vibration screening efficiency of printed circuit boards, characterized in that: Including fixed plate, movable plate and mounting frame; The mounting frame is arranged horizontally and is used to support the fixed plate and the movable plate; The two fixing plates are arranged facing each other and in parallel, and are respectively fixed vertically at two ends of the installation frame; The two movable plates are arranged in back-to-back and parallel positions, and can be displaced and vertically fixed in the installation frame, located between the two fixed plates, and parallel to the fixed plates; The fixed plate is horizontally provided with a plurality of concave slots on one side facing the mounting frame; the movable plate is provided with a plurality of slots identical to those of the fixed plate on one side, the slots of the two movable plates are respectively located on the sides facing the slots of the two fixed plates, and the slots of the movable plates are horizontally aligned one by one with the slots of the fixed plates they face; The fixed plate and the movable plate opposite to the slot form a group, and a printed circuit board to be tested of a certain specification is horizontally inserted between them. The two ends of the printed circuit board are respectively located in a group of corresponding slots of equal height of the fixed plate and the movable plate of the group; the distance from the movable plate to the fixed plate in the same group is adjustable.

2. The universal vibration tooling for improving the vibration screening efficiency of printed circuit boards according to claim 1, characterized in that: The slot width matches the thickness of the printed circuit board.

3. The universal vibration tooling for improving the vibration screening efficiency of printed circuit boards according to claim 1 is characterized in that: The mounting frame comprises an upper crossbeam and a lower crossbeam; the two lower crossbeams and the two upper crossbeams are parallel to each other and aligned at both ends to form a rectangular structure mounting frame; the end surfaces of the lower crossbeam are respectively fixedly connected to the lower inner end surfaces of the two fixed plates; the end surfaces of the upper crossbeam are respectively fixedly connected to the upper inner end surfaces of the two fixed plates.

4. The universal vibration tooling for improving the vibration screening efficiency of printed circuit boards according to claim 3 is characterized in that: Mounting plates are fixed on both sides of the movable plate, and the mounting plates are used for detachably fixed connection with the upper crossbeam and the lower crossbeam.

5. The universal vibration tooling for improving the vibration screening efficiency of printed circuit boards according to claim 4 is characterized in that: Nut strips are fixed on the outer sides of the upper crossbeam and the lower crossbeam, and threaded holes matching the nut strips are provided at both ends of the mounting plate for fixing the mounting plate and the nut strips with screws.

6. The universal vibration tooling for improving the vibration screening efficiency of printed circuit boards according to claim 5 is characterized in that: Two threaded holes are provided at both ends of the mounting plate, and the hole spacing is the same as the hole spacing of two adjacent screw holes on the nut strip.

7. The universal vibration tooling for improving the vibration screening efficiency of printed circuit boards according to claim 1 is characterized in that: The lower end surface of the fixing plate is tightly fixedly connected to the table surface of the vibration test table through bolts.

8. A method for using the universal vibration tooling for improving the vibration screening efficiency of printed circuit boards as claimed in claim 1, characterized in that: Here are the steps: Step 1. Adjust the installation position of a movable plate so that the spacing between it and the corresponding fixed plate of the same group meets the horizontal insertion of the printed board of the first size specification, and insert the printed board of the first size specification; Step 2. Adjust the installation position of another movable plate so that the spacing between it and the corresponding fixed plate of the same group meets the horizontal insertion of the second size specification printed board, and horizontally insert the second size specification printed board; Step 3. Install the vibration fixture equipped with the printed circuit board of the first size specification and the printed circuit board of the second size specification on the horizontal vibration table, so that the lower end surfaces of the two fixed plates are tightly fixedly connected to the horizontal vibration table by bolts; and perform a vibration test; Step 4. Remove the vibration fixture equipped with the printed circuit board of the first size specification and the printed circuit board of the second size specification from the horizontal vibration table, and reinstall it on the vertical vibration table, so that the lower end surfaces of the two fixing plates are tightly fixed and connected to the vertical vibration table by bolts; and perform a vibration test; Complete vibration screening of printed circuit boards of two sizes.

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