General electronic equipment printed circuit board modal test clamp

Abstract

The utility model discloses a universal electronic equipment printed circuit board modal test fixture, which comprises a square bottom plate and a support column, the periphery of the square bottom plate is provided with chutes, the four corners of the square bottom plate are provided with cross recesses, and the cross recesses are communicated with the chutes; the supporting column is connected with the cross groove in a sliding mode and can slide along the sliding groove. And a circuit board supporting structure is arranged on the supporting column. The sliding grooves are matched with the supporting column sliding blocks, the positions of the supporting columns can be freely adjusted according to the shape and size of an experimental object printed circuit board, therefore, the application range is wide, and the progress speed and efficiency of a modal test are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated circuits, in particular to a modal test fixture for a printed circuit board of a general electronic equipment. Background Art

[0002] Modal testing is one of the important means to measure the dynamic characteristics of electronic equipment structures, such as natural frequency and vibration mode. It can also verify the accuracy of modal simulation analysis models, provide timely feedback and update simulation model parameters, and achieve accurate consistency between simulation and real objects through continuous approximation and accumulation. The modal test fixture can provide a weak spring boundary for the object under test in the modal test, and can stimulate the complete vibration mode of the test object in conjunction with the force hammer. A qualified modal test fixture can eliminate the influence of the inertial parameters of the test object on the test results caused by the additional device, making the test results true and reliable.

[0003] Publication number CN115824627A proposes a modal test fixture suitable for shaft structures, but this fixture is difficult to apply to modal test of printed circuit boards with various forms and sizes. Publication numbers CN 207923458 U and CN219870305 U both propose a modal test platform system for automotive parts. This type of modal test equipment is suitable for large structures such as vehicle frames. The structure is complex and the equipment needs to be powered when in use, which is too complicated for lightweight printed circuit boards. Publication number CN 213956712U proposes a vibration impact modal test fixture, which uses bolts to tighten rigid connections and cannot simulate the weak spring boundary conditions of free modal testing.

[0004] It can be seen from the above-mentioned prior art that there is currently no universal electronic equipment printed circuit board modal test support fixture, which cannot provide high-quality weak spring boundary conditions for the test sample. Modern electronic equipment has diverse functions, extremely different sizes and layouts, but the existing fixture can only achieve the same size and shape of clamping, which inevitably leads to slow progress and low efficiency of modal testing. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the existing clamps can only achieve clamping of the same size and shape, which inevitably leads to slow progress and low efficiency of modal test.

[0006] The utility model provides a universal electronic equipment printed circuit board modal test fixture, comprising a square bottom plate and a support column, wherein the four sides of the square bottom plate are provided with slide grooves, the four corners of the square bottom plate are provided with cross grooves, the cross grooves are connected with the slide grooves; the support column is slidably connected with the cross grooves and can slide along the slide grooves; and a circuit board support structure is arranged on the support column.

[0007] As a possible design, at least part of the end of the support column away from the square bottom plate is hollow, and through holes are provided on two opposite walls of the hollow part of the support column;

[0008] The circuit board support structure includes an elastic rope and a pin shaft, the pin shaft is arranged in the through hole, both ends of the pin shaft are provided with locking nuts and the locking nuts are arranged on the outer wall of the support column, the part of the pin shaft arranged in the hollow is connected to one end of the elastic rope, and the elastic rope is wrapped around the pin shaft, and the other end of the elastic rope passes through the support column and is connected to a hook.

[0009] As a possible design, one end of the hollow portion of the support column is a detachable stop cover, and a through hole is provided on the stop cover.

[0010] As a possible design, a locking plate is provided at one end of the support column close to the cross slot. After the support column is moved to the position and erected, the locking is achieved by tightening the screws on the plate.

[0011] As a possible design, a hinge is connected to one end of the support column close to the cross groove, one of the blades of the hinge is connected to the support column, and the other surface is a free piece, and the lower surface of the free piece is provided with a first sliding block adapted to the slide groove.

[0012] As a possible design, a second sliding block is provided at the lower end of the support column; when the hinge is unfolded, the second sliding block and the first sliding block are in the same straight line.

[0013] As a possible design, an anti-slip pad is fixed on the lower surface of the square bottom plate.

[0014] As a possible design, the square bottom plate is in a U-shape.

[0015] As a possible design, the first sliding block and the free sheet are integrally formed; the second sliding block and the lower end of the support column are integrally formed.

[0016] As a possible design, the hinge is arranged on the side of the support column, and when the hinge is unfolded, the first sliding block is placed in the sliding groove.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] 1. The slide groove cooperates with the support column slider, and the position of the support column can be freely adjusted according to the shape and size of the printed circuit board of the test object. Therefore, it has a wide range of applications and improves the progress speed and efficiency of the modal test.

[0019] 2. The general electronic equipment printed circuit board modal test fixture disclosed in the present invention has a simple structure and is easy to operate. It has two states: the support column is erected and laid flat. When it is erected, it is used to fix the modal test sample. When it is laid flat, it is easy to store and place.

[0020] 3. The hook is used to connect the printed circuit board for easy disassembly and assembly.

[0021] 4. The elastic rope is used to simulate the weak spring boundary conditions of the modal test, making the modal test results more realistic and reliable.

[0022] 5. An anti-slip pad is installed on the bottom plate to prevent the modal test fixture from sliding when striking the printed circuit board during the modal test. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0024] Figure 1 Schematic diagram of a modal test fixture for a printed circuit board of a general electronic device in an embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of a support column in an embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of a square bottom plate in an embodiment of the utility model;

[0027] Figure 4 A schematic diagram of a hinge in an embodiment of the utility model;

[0028] Figure 5 It is a schematic diagram of a modal test fixture for a printed circuit board of a general electronic device when the support column is in an upright state in an embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of a modal test fixture on a test circuit board in an embodiment of the utility model.

[0030] Marks and corresponding parts names in the attached drawings:

[0031] 1-square bottom plate, 2-support column, 201-hook, 202-elastic rope, 203-stop cover, 204-pin shaft, 205-locking nut, 206-locking pressure plate, 207-hinge, 2071-blade; 2072-free sheet, 3-anti-slip pad, 4-printed circuit board, 5-slide groove, 6-first slider, 7-second slider, 8-cross groove. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0035] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions 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 device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Since the existing modal test fixture can only achieve the clamping of the same size and shape, it leads to a narrow adaptability range and low test efficiency, that is, poor versatility.

[0038] Based on the above problems, Figure 1As shown, the utility model provides a modal test fixture for a printed circuit board 4 of a general electronic device, comprising a square bottom plate 1 and a support column 2, wherein the square bottom plate 1 is provided with slide grooves 5 on all four sides, and the four corners of the square bottom plate 1 are provided with cross grooves 8, wherein the cross grooves 8 are connected to the slide grooves 5; the support column 2 is slidably connected to the cross grooves 8 and can slide along the slide grooves 5; and a circuit board support structure is provided on the support column 2.

[0039] The support columns 2 slide along the slide grooves 5 to adjust the distance between adjacent support columns 2, thereby being used for modal tests of printed circuit boards 4 of different sizes and shapes, having a wide range of applications and being able to improve the efficiency of modal tests.

[0040] When no modal test is performed, one end of the support column 2 is located in the cross groove 8; when a modal test is required, the support column 2 slides along the slide groove 5 to a required position.

[0041] The bottom of the support column 2 may be provided with a roller or a second slider 7. When performing a modal test, the roller or the second slider 7 is placed in the slide groove 5. There is a distance between the roller or the second slider 7 and the wall of the slide groove 5 to facilitate smooth sliding.

[0042] The main function of the circuit board support structure is to support the circuit board. In actual modal tests, it is hoped that the circuit board is in a stable weak spring boundary condition, which can greatly improve the stability and accuracy of the modal test. Therefore, the circuit board support structure is best able to provide a weak spring boundary condition.

[0043] As a possible implementation, Figure 2 As shown, at least part of the end of the support column 2 away from the square bottom plate 1 is hollow, and through holes are provided on two opposite walls of the hollow part of the support column 2.

[0044] The circuit board support structure includes an elastic rope 202 and a pin 204. The pin 204 is inserted into the through hole. Locking nuts 205 are provided at both ends of the pin 204 and the locking nuts 205 are provided on the outer wall of the support column 2. The part of the pin 204 provided in the hollow is connected to one end of the elastic rope 202, and the elastic rope 202 is wound around the pin 204. The other end of the elastic rope 202 passes through the support column 2 and is connected to a hook 201.

[0045] The hollow part is mainly for the installation of the elastic rope 202 and the pin 204 and the movement of the elastic rope 202. The hooks 201 at the tops of the four support columns 2 are all used to hang the four corners of the circuit board to achieve support.

[0046] In actual application, in order to make the hook 201 reach the desired position, it is necessary to first unscrew the locking nut 205 so that the pin 204 can rotate around its own central axis, and then pull the hook 201 to the desired position, tighten the locking nut 205 to fix the pin 204. During this process, the elastic rope 202 is unwound from the pin 204 and stretched, thereby providing a stable weak spring boundary condition.

[0047] The elastic rope 202 can also be replaced by a material with a certain elasticity such as a spring or rubber.

[0048] As a possible implementation, the elastic rope 202 is conveniently led out from the hollow part, such as Figure 2 As shown, one end of the hollow part of the support column 2 is a detachable stop cover 203 , and a through hole is provided on the stop cover 203 .

[0049] Before the elastic rope 202 is led out, the stop cover 203 is opened, and the elastic rope 202 is pulled by hand or a tool so that it is led out of the top of the support column 2 and then passes through the through hole on the stop cover 203 and then connected to the hook 201.

[0050] As a possible implementation method, in order to facilitate the stability of modal tests, such as Figure 2 As shown, a locking plate 206 is provided at one end of the support column 2 close to the cross groove 8 . After the support column 2 is moved into position and erected, locking is achieved by tightening the screws on the locking plate 206 .

[0051] As a possible implementation, in order to facilitate the storage of the support column 2, as Figure 2 Shown and Figure 4 The support column 2 is connected to one end of the cross groove 8 with a hinge 207, one blade 2071 of the hinge 207 is connected to the support column 2, and the other surface is a free piece 2072, and the lower surface of the free piece 2072 is provided with a first slider 6 adapted to the slide groove 5.

[0052] The first slider 6 and the lower surface of the free piece 2072 can be fixedly connected or integrally formed. When stored, the first slider 6 is placed in the slide groove 5, so the hinge 207 is arranged on the surface that contacts the square bottom plate 1 after the support column 2 is stored.

[0053] One of the blades 2071 of the hinge 207 is connected to the support column 2, and the connection here can be a fixed connection or a detachable connection.

[0054] The sliding connection between the support column 2 and the cross groove 8 can be achieved by the following means:

[0055] The lower end of the support column 2 is provided with a second slider 7, and when the hinge 207 is unfolded, the second slider 7 and the first slider 6 are in the same straight line, so as to ensure that the second slider 7 can slide in the slide groove 5, and the support column 2 can also be stored.

[0056] To prevent the fixture from sliding relative to the ground, Figure 1 As shown, a non-slip pad 3 is fixed on the lower surface of the square bottom plate 1. The fixing here can be a commonly used connection method in the art such as bonding.

[0057] In order to reduce the weight of the modal test fixture, such as Figure 2 As shown, the square bottom plate 1 is in a U-shape, that is, the middle is completely empty.

[0058] In actual use, Figure 2 As shown, the hinge 207 is arranged on the side of the support column 2, and the side here refers to the surface where the support column 2 and the square bottom plate 1 are in contact; when the hinge 207 is unfolded, the first slider 6 is placed in the slide groove 5, that is, the first slider 6 is in the free piece 2072 of the hinge 207 that is not in contact with the square bottom plate 1.

[0059] The following example illustrates

[0060] The technical solution of this example is:

[0061] A modal test fixture for a printed circuit board 4 of a general electronic device comprises a square base plate 1 and a support column 2. The square base plate 1 is provided with slide grooves 5 on all four sides, and the four corners of the square base plate 1 are provided with cross grooves 8, wherein the cross grooves 8 are connected to the slide grooves 5; the support column 2 is slidably connected to the cross grooves 8 and can slide along the slide grooves 5; a circuit board support structure is provided on the support column 2.

[0062] One end of the support column 2 away from the square bottom plate 1 is at least partially hollow, and two opposite walls of the hollow part of the support column 2 are provided with through holes;

[0063] The circuit board support structure includes an elastic rope 202 and a pin 204. The pin 204 is inserted into the through hole. Locking nuts 205 are provided at both ends of the pin 204 and the locking nuts 205 are provided on the outer wall of the support column 2. The part of the pin 204 provided in the hollow is connected to one end of the elastic rope 202, and the elastic rope 202 is wound around the pin 204. The other end of the elastic rope 202 passes through the support column 2 and is connected to a hook 201.

[0064] One end of the hollow part of the support column 2 is a detachable stop cover 203 , and a through hole is provided on the stop cover 203 .

[0065] A locking plate 206 is disposed at one end of the support column 2 close to the cross slot 8 .

[0066] The support column 2 is connected to one end of the cross groove 8 with a hinge 207, one of the blades 2071 of the hinge 207 is connected to the support column 2, and the other surface is a free piece 2072, and the lower surface of the free piece 2072 is provided with a first slider 6 adapted to the slide groove 5.

[0067] A second sliding block 7 is disposed at the lower end of the support column 2; when the hinge 207 is unfolded, the second sliding block 7 and the first sliding block 6 are in the same straight line.

[0068] An anti-slip pad 3 is fixed on the lower surface of the square bottom plate 1 .

[0069] The square bottom plate 1 is in a square shape.

[0070] The first sliding block 6 and the free piece 2072 are integrally formed; the second sliding block 7 and the lower end of the supporting column 2 are integrally formed.

[0071] The steps for using the modal test fixture are as follows:

[0072] The first step is to place the fixture on a flat surface and manually raise the four support columns 2 from a flat state. Figure 5 shown.

[0073] In the second step, the position of the support column 2 is adjusted according to the shape and size of the printed circuit board 4 of the experimental object, so that it moves to a suitable position in the square base slide groove 5, and then the support column 2 is locked by using the locking plate 206. Figure 5 shown.

[0074] The third step is to loosen the locking nut 205 that fixes the pin shaft 204 so that the pin shaft 204 can rotate relative to the support column 2, pull out the hook 201 to hook up the printed circuit board 4 that needs to be subjected to the modal test, and tighten the nut to fix the pin shaft 204 to the support column 2. Figure 6 shown.

[0075] The fourth step is to carry out modal tests, using a hammer to strike and special testing instruments to collect signals.

[0076] Step 5: After completing the modal test, manually lay down the four support columns 2, as shown in the figure. Figure 1 shown.

[0077] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A general electronic equipment printed circuit board modal test fixture, characterized in that: It includes a square bottom plate and a support column. The four sides of the square bottom plate are provided with slide grooves. The four corners of the square bottom plate are provided with cross grooves. The cross grooves are connected to the slide grooves. The support column is slidably connected to the cross grooves and can slide along the slide grooves. A circuit board support structure is arranged on the support column.

2. The general electronic equipment printed circuit board modal test fixture according to claim 1, characterized in that: One end of the support column away from the square bottom plate is at least partially hollow, and two opposite walls of the hollow part of the support column are provided with through holes; The circuit board support structure includes an elastic rope and a pin shaft, the pin shaft is arranged in the through hole, both ends of the pin shaft are provided with locking nuts and the locking nuts are arranged on the outer wall of the support column, the part of the pin shaft arranged in the hollow is connected to one end of the elastic rope, and the elastic rope is wrapped around the pin shaft, and the other end of the elastic rope passes through the support column and is connected to a hook.

3. The general electronic equipment printed circuit board modal test fixture according to claim 1, characterized in that: One end of the hollow part of the support column is a detachable stop cover, and a through hole is provided on the stop cover.

4. The general electronic equipment printed circuit board modal test fixture according to claim 1, characterized in that: A locking pressure plate is arranged at one end of the support column close to the cross groove.

5. The general electronic equipment printed circuit board modal test fixture according to claim 1, characterized in that: The support column is connected to a hinge at one end close to the cross groove, one of the leaves of the hinge is connected to the support column, and the other surface is a free piece, and the lower surface of the free piece is provided with a first sliding block adapted to the slide groove.

6. The general electronic equipment printed circuit board modal test fixture according to claim 5, characterized in that: A second sliding block is disposed at the lower end of the support column; when the hinge is unfolded, the second sliding block and the first sliding block are in the same straight line.

7. The general electronic equipment printed circuit board modal test fixture according to claim 1, characterized in that: An anti-skid pad is fixed on the lower surface of the square bottom plate.

8. The general electronic equipment printed circuit board modal test fixture according to claim 1, characterized in that: The square bottom plate is in a square shape.

9. The general electronic equipment printed circuit board modal test fixture according to claim 6, characterized in that: The first sliding block and the free sheet are integrally formed; the second sliding block and the lower end of the supporting column are integrally formed.

10. The general electronic equipment printed circuit board modal test fixture according to claim 6, characterized in that: The hinge is arranged on the side surface of the supporting column, and when the hinge is unfolded, the first sliding block is placed in the sliding groove.

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