A fixture for vibration testing of EMI filters

Abstract

The utility model discloses a fixing device for vibration testing of an EMI filter, comprising a base, a limiting plate and a clamping unit, wherein the base comprises a supporting plate and a guide plate, wherein the guide plate is arranged above the supporting plate and is arranged perpendicularly to the supporting plate; the limiting plate is arranged at one side of the guide plate and is arranged parallel to the guide plate and is connected by screws; the clamping unit is arranged between the limiting plate and the guide plate, and the clamping unit is used for clamping the EMI filter for testing; in the utility model, a clamping unit is arranged between the guide plate and the limiting plate, wherein the clamping unit comprises a fixing part and an adjusting component, and the guide plate and the limiting plate are arranged at intervals, so that the clamping direction of the fixing part and the adjusting component in the clamping unit to the EMI filter can be adjusted, thereby enabling multi-directional vibration testing of the EMI filter to be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of EMI filter testing, and in particular relates to a fixing device for EMI filter vibration testing. Background Art

[0002] In order to test whether the EMI filter can withstand the vibration environment during transportation or use during its entire life cycle, it is necessary to conduct a vibration test on the product; the vibration test is a test conducted on the vibrated object or model in order to evaluate the product's vibration resistance in the expected use environment. The vibration test equipment is divided into two parts: loading equipment and control equipment. Loading equipment includes mechanical vibration tables, electromagnetic vibration tables, and electro-hydraulic vibration tables. The electromagnetic vibration table is currently the most widely used loading equipment, and most vibration tests are currently conducted on this type of vibration table. Vibration control tests are used to generate vibration signals and control the magnitude of vibration.

[0003] Vibration test is mainly environmental simulation, and the test parameters are frequency range, vibration amplitude and test duration. The impact of vibration on products includes: structural damage, such as structural deformation, product cracks or fractures; product function failure or performance out of tolerance, such as poor contact, relay malfunction, etc. This kind of damage is not permanent damage, because once the vibration is reduced or stopped, the work can be restored to normal; process damage, such as loose screws or connectors, desoldering.

[0004] In order to ensure that the EMI filter is not destroyed or damaged during the vibration test, the design of a reasonable vibration test fixture is particularly critical; in the vibration test of the EMI filter, it is generally required to perform vibration tests in three directions, and the test process requires external equipment to detect whether there is a momentary open circuit or short circuit during the vibration process. The way the EMI filter is fixed to the vibration table is very important. A reasonable vibration test fixture can ensure the rigid connection between the EMI filter and the vibration table, ensure the minimum distortion transmission of the vibration wave, and perform vibration tests in three directions, and have a certain space for external equipment. Utility Model Content

[0005] The utility model aims to provide a fixing device for EMI filter vibration testing, wherein a clamping unit is limited by a base and a limiting plate, and the clamping unit can fix multiple EMI filters in a horizontal or vertical direction between the base and the limiting plate to complete the vibration test.

[0006] The utility model is realized by the following technical solutions:

[0007] A fixing device for vibration testing of an EMI filter comprises a base, a limit plate and a clamping unit, wherein the base comprises a support plate and a guide plate, wherein the guide plate is arranged above the support plate and perpendicular to the support plate; the limit plate is arranged on one side of the guide plate and parallel to the guide plate and connected by screws; the clamping unit is arranged between the limit plate and the guide plate, and is used to clamp the EMI filter for testing.

[0008] Furthermore, the clamping unit includes a fixing member and an adjusting assembly, and the fixing member is connected to the guide plate by bolts; the guide plate is a square plate structure, and the length of the fixing member is the same as the length of the guide plate.

[0009] Furthermore, the adjustment assembly includes a positioning member, a sliding member and an adjusting bolt; the positioning member is connected to the guide plate by screws, a threaded hole is provided on the positioning member, the adjusting bolt passes through the threaded hole and is connected to the sliding member, and the adjusting bolt is used to adjust the distance between the sliding member and the fixing member.

[0010] Furthermore, two horizontal guide grooves are provided on the surface of one side of the guide plate of the base facing the limit plate, and the two horizontal guide grooves are both open on the side of the guide plate and are arranged at intervals; two protrusions are provided on the sliding member, and the spacing between the two protrusions is the same as the spacing between the two horizontal guide grooves, and the protrusions slide in the horizontal guide grooves to limit the sliding member.

[0011] Furthermore, two vertical guide grooves are arranged on one side surface of the guide plate facing the limit plate, and the two vertical guide grooves are both open to the top surface of the guide plate and are arranged at intervals; the spacing between the two vertical guide grooves is the same as the spacing between the two protrusions on the sliding member.

[0012] Furthermore, supporting feet are provided on both left and right sides below the guide plate, and the supporting feet abut against the surface of the support plate.

[0013] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0014] 1) In the utility model, a clamping unit is provided between the guide plate and the limit plate, the clamping unit includes a fixing part and an adjusting component, and the guide plate and the limit plate are arranged at intervals, so that the clamping direction of the fixing part and the adjusting component in the clamping unit on the EMI filter can be adjusted, thereby enabling multi-directional vibration testing of the EMI filter.

[0015] 2) In the utility model, two horizontal guide grooves and a vertical guide groove are arranged on the guide plate. When performing a horizontal clamping vibration test on the EMI filter, the horizontal guide groove can be used to cooperate with the protrusion of the sliding part to limit the sliding part, thereby ensuring the horizontal clamping effect of the sliding part on the EMI filter; when performing a vertical clamping vibration test on the EMI filter, the vertical guide groove can be used to cooperate with the protrusion of the sliding part to limit the sliding part, thereby ensuring the vertical clamping effect of the sliding part on the EMI filter. The structure is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 The utility model is a schematic diagram of the overall structure of the fixing device for EMI filter vibration testing.

[0018] Figure 2 The utility model is a schematic diagram of the top view of the fixing device for EMI filter vibration testing.

[0019] Figure 3 It is a structural explosion diagram of the fixing device for EMI filter vibration testing of the utility model.

[0020] Among them: 1-support plate, 2-guide plate, 21-horizontal guide groove, 22-vertical guide groove, 23-support foot, 3-limiting plate, 4-fixing part, 5-positioning part, 6-adjusting bolt, 7-sliding part. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0022] Embodiment 1:

[0023] The main structure of this embodiment is a fixture for vibration testing of EMI filters, such as Figure 1 , Figure 2 and Figure 3As shown, it includes a base, a limit plate 3 and a clamping unit, the base includes a support plate 1 and a guide plate 2, the guide plate 2 is arranged above the support plate 1 and is arranged vertically with the support plate 1; the limit plate 3 is arranged on one side of the guide plate 2 and is arranged parallel to the guide plate 2 and is connected by screws; the clamping unit is arranged between the limit plate 3 and the guide plate 2, and the clamping unit is used to clamp the EMI filter for testing; the clamping unit includes a fixing member 4 and an adjusting assembly, the fixing member 4 is connected to the guide plate 2 by bolts; the guide plate 2 is a square plate structure, and the length of the fixing member 4 is the same as that of the guide plate 2; the adjusting assembly includes a positioning member 5, a sliding member 7 and an adjusting bolt 6; the positioning member 5 It is connected to the guide plate 2 by screws, and a threaded hole is provided on the positioning member 5. The adjusting bolt 6 passes through the threaded hole and is connected to the sliding member 7. The adjusting bolt 6 is used to adjust the distance between the sliding member 7 and the fixing member 4; two horizontal guide grooves 21 are provided on the surface of the guide plate 2 of the base on one side facing the limiting plate 3, and the two horizontal guide grooves 21 are both opened on the side of the guide plate 2 and are arranged at intervals; two protrusions are provided on the sliding member 7, and the distance between the two protrusions is the same as the distance between the two horizontal guide grooves 21, and the protrusions slide in the horizontal guide grooves 21 to limit the sliding member 7; supporting feet 23 are provided on the left and right sides below the guide plate 2, and the supporting feet 23 abut against the surface of the support plate 1.

[0024] The base includes a support plate 1 and a guide plate 2. The guide plate 2 is arranged above the support plate 1 and is arranged perpendicular to the support plate 1. The ends of the left and right sides of the guide plate 2 are provided with support feet 23. The support feet 23 are of a triangular structure. The support feet 23 are respectively connected to the guide plate 2 and the support plate 1, so that the guide plate 2 remains stable above the support plate 1; a limit plate 3 is arranged on one side of the guide plate 2. The size of the limit plate 3 is adapted to the guide plate 2. The limit plate 3 and the guide plate 2 are arranged at intervals. The limit plate 3 is connected to the guide plate 2 by screws. A clamping unit is arranged between the limit plate 3 and the guide plate 2. The clamping unit includes a fixing part 4, a positioning part 5, a sliding part 7 and an adjusting bolt 6. The fixing part 4 is arranged on the side edge or bottom edge of the guide plate 2; the fixing part 4 is a rod-shaped structure, which is connected and fixed to the guide plate 2 by two screws. When the EMI filter is fixed in a horizontal manner, the fixing part 4 is arranged It is placed on the side edge of the guide plate 2, and the positioning member 5 is arranged at the opposite side of the fixing member 4, and is also fixed to the guide plate 2 by two screws. Two horizontal guide grooves 21 are arranged on the guide plate 2, and the two horizontal guide grooves 21 are arranged at intervals. The sliding member 7 is arranged between the fixing member 4 and the positioning member 5 and is connected to the positioning member 5 through an adjusting bolt 6. The adjusting bolt 6 passes through the threaded hole on the positioning member 5 and is connected to the sliding member 7. The upper and lower ends of the sliding member 7 are provided with protrusions, and the protrusions are adapted to the depth of the horizontal guide groove 21. The spacing between the two protrusions is the same as the spacing between the two horizontal guide grooves 21; by rotating the adjusting bolt 6, the sliding member 7 can be driven to move closer to or away from the fixing member 4 along the horizontal guide groove 21. The EMI filter is arranged between the fixing member 4 and the sliding member 7, and the EMI filter is fixed by squeezing the sliding member 7 toward the fixing member 4 for vibration testing.

[0025] Embodiment 2:

[0026] Based on the above embodiment, this embodiment further adds a vertical guide groove 22. Two vertical guide grooves 22 are arranged on the side surface of the guide plate 2 facing the limit plate 3. The two vertical guide grooves 22 are both opened on the top surface of the guide plate 2 and are arranged at intervals; the distance between the two vertical guide grooves 22 is the same as the distance between the two protrusions on the sliding member 7.

[0027] In order to be able to perform vibration tests on the EMI filter in different directions, two vertical guide grooves 22 are also provided on the guide plate 2, and the vertical guide grooves 22 are perpendicular to the horizontal guide grooves 21. When the EMI filter is subjected to a vibration test in the vertical direction, the fixing member 4 is arranged at the lower edge of the guide plate 2, the positioning member 5 is arranged at the upper edge of the guide plate 2, and the sliding member 7 is also arranged between the positioning member 5 and the fixing member 4. The distance between the positioning member 5 and the fixing member 4 is adjusted by adjusting the bolt 6, so that the EMI filter is clamped and fixed for vibration testing; the distance between the two vertical guide grooves 22 is also matched with the distance between the two protrusions on the sliding member 7, so that the sliding member 7 can be limited and can remain stable without displacement when sliding up and down between the fixing member 4 and the positioning member 5. The other parts of this embodiment are the same as the above embodiment, and will not be repeated here.

[0028] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when used. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0029] In addition, if the terms "horizontal" or "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A fixture for EMI filter vibration testing, characterized in that: It includes a base, a limit plate and a clamping unit. The base includes a support plate and a guide plate. The guide plate is arranged above the support plate and perpendicular to the support plate; the limit plate is arranged on one side of the guide plate and is arranged parallel to the guide plate and is connected by screws; the clamping unit is arranged between the limit plate and the guide plate, and the clamping unit is used to clamp the EMI filter for testing.

2. The fixture for EMI filter vibration testing as claimed in claim 1, characterized in that: The clamping unit includes a fixing piece and an adjusting assembly, wherein the fixing piece is connected to the guide plate via bolts; the guide plate is a square plate structure, and the length of the fixing piece is the same as that of the guide plate.

3. The fixture for EMI filter vibration testing as claimed in claim 2, characterized in that: The adjustment assembly includes a positioning member, a sliding member and an adjusting bolt; the positioning member is connected to the guide plate by screws, a threaded hole is provided on the positioning member, the adjusting bolt passes through the threaded hole and is connected to the sliding member, and the adjusting bolt is used to adjust the distance between the sliding member and the fixing member.

4. The fixture for EMI filter vibration testing as claimed in claim 3, characterized in that: Two horizontal guide grooves are arranged on the side surface of the guide plate of the base facing the limit plate, and the two horizontal guide grooves are both open on the side of the guide plate and are arranged at intervals; two protrusions are arranged on the sliding member, and the spacing between the two protrusions is the same as the spacing between the two horizontal guide grooves, and the protrusions slide in the horizontal guide grooves to limit the sliding member.

5. The fixture for EMI filter vibration testing as claimed in claim 4, characterized in that: Two vertical guide grooves are arranged on one side surface of the guide plate facing the limit plate. Both vertical guide grooves are opened on the top surface of the guide plate and are arranged at intervals. The spacing between the two vertical guide grooves is the same as the spacing between the two protrusions on the sliding member.

6. The fixture for EMI filter vibration testing as claimed in claim 1, characterized in that: Support feet are arranged on both left and right sides below the guide plate, and the support feet are in contact with the surface of the support plate.

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