A conductive gasket shielding performance test device

Abstract

The present invention discloses a test device for the shielding performance of conductive gaskets in the field of electromagnetic compatibility technology, aiming to solve the problems in the prior art that it is impossible to quickly and conveniently test the shielding characteristics of different conductive gaskets and to realize the shielding characteristic test of conductive gaskets under different pre-tightening force conditions. It includes a main body, an injection connector, a test connector, an insulator, a measuring conductor, a pressing assembly, an end cover and a matching resistor; the present invention is applicable to the shielding performance test of conductive gaskets. Only by replacing the conductive gasket to be tested can the shielding characteristics of different conductive gaskets be quickly and conveniently tested; only by adjusting the pre-tightening force applied by the pressing assembly to the conductive gasket to be tested can the shielding characteristic test of the conductive gasket under different pre-tightening force conditions be realized. Its operation is simple, the test effect is stable, and the practical application value is great.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic compatibility, and particularly to a test device for the shielding performance of conductive gaskets. Background Art

[0002] Currently, digital and intelligent control play an important role in aerospace, industrial control, and intelligent control. However, during the rapid development of electronic products, the disadvantages of poor anti-interference ability of electronic products have been continuously exposed. Especially when under the action of strong electromagnetic pulses in special places, it will have a greater impact on the reliability of the control system. How to increase the anti-interference ability of electronic control systems against strong electromagnetic pulses has become the focus of attention of more and more scientific and technological personnel.

[0003] The contact characteristics between the connector and the controller housing mainly rely on the conductive gasket and the applied pre-tightening force. How to realize the shielding characteristic test of the conductive gasket and different pre-tightening forces is of great significance.

[0004] Therefore, how to realize a fast and convenient shielding characteristic test for different conductive gaskets, and to realize the shielding characteristic test of the conductive gasket under different pre-tightening force conditions is an urgent technical problem to be solved currently. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a test device for the shielding performance of conductive gaskets, so as to solve the problem that the shielding characteristic test of different conductive gaskets cannot be carried out quickly and conveniently currently, and to realize the shielding characteristic test of the conductive gasket under different pre-tightening force conditions.

[0006] To solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0007] The present invention provides a test device for the shielding performance of conductive gaskets, including: a main body, an injection connector, and a test connector. The injection connector includes an injection housing and an injection conductive column, and the test connector includes a test housing and a test conductive column;

[0008] A receiving cavity is opened at the top of the main body. An insulator is provided in the receiving cavity. A measuring conductor for placing a conductive gasket is provided on the insulator. A first through hole communicating with the receiving cavity is opened outside the main body. The test housing is installed on the main body, and the test conductive column passes through the first through hole and is connected to the measuring conductor;

[0009] A pressing assembly is detachably connected in the receiving cavity. The pressing assembly can perform relative displacement with the main body to apply a pre-tightening force to the conductive gasket;

[0010] A end cap is movably connected to the top of the pressing assembly. The end cap can perform relative displacement along the axis of the main body with respect to the pressing assembly. A second through hole is provided in the top of the end cap. The injection housing is mounted on the end cap. The injection conductive post passes through the second through hole and is connected to the measurement conductor through a matching resistor.

[0011] Further, the pressing assembly includes a sleeve and a pressing ring sleeved outside the sleeve. The pressing ring is movably connected to the accommodating cavity and can perform relative displacement along the axis of the main body. A rib for pressing the conductive gasket is provided on the outer periphery of the sleeve.

[0012] Further, the pressing ring is threadedly connected to the accommodating cavity, and a plurality of driving grooves are provided on the pressing ring.

[0013] Further, a movable cavity is provided at the bottom of the end cap. The end cap is threadedly connected to the sleeve through the movable cavity.

[0014] Further, a strain gauge is provided on the outer wall of the main body. The strain gauge is used to measure the pre-tightening force applied by the pressing ring to the conductive gasket.

[0015] Further, it further includes an injection conductor threadedly connected to the injection conductive post. A matching resistor is provided at the bottom end of the injection conductor to realize the connection between the injection conductive post and the measurement conductor.

[0016] Further, the measurement conductor includes a connecting column and a measurement table for placing the conductive gasket. The connecting column is threadedly connected to the test conductive post.

[0017] Further, the accommodating cavity includes an upper cavity for placing the insulator and a lower cavity for accommodating the test conductive post;

[0018] The connecting column is provided at the bottom of the measurement table. The bottom end of the connecting column passes through the insulator and is threadedly connected to the test conductive post.

[0019] Further, a limiting groove matching the measurement table is provided at the top of the insulator.

[0020] Further, a accommodating groove for receiving the sleeve is provided at the top of the measurement table.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0022] 1. The present invention forms an injection loop by electrically connecting an injection housing, an end cap, a compression assembly, a conductive gasket under test, a measurement conductor, a matching resistor, and an injection conductive post in sequence, forms an upper test loop by electrically connecting a test housing, a main body, and a compression assembly in sequence, and forms a lower test loop by electrically connecting a test conductive post and a measurement conductor, thereby realizing the test of shielding performance; during debugging, only by replacing the conductive gasket under test, the shielding characteristics of different conductive gaskets can be tested quickly and conveniently; only by adjusting the pre-tightening force applied by the compression assembly to the conductive gasket under test, the shielding characteristics of the conductive gasket under different pre-tightening force conditions can be tested. Its operation is simple, the test effect is stable, and it has great practical application value.

[0023] 2. The present invention adjusts the driving groove to push the compression ring to rotate, causing the compression ring to displace, thereby adjusting the compression force applied by the compression ring to the rib, and further adjusting the pre-tightening force applied by the rib to the conductive gasket. Its operation is simple, the structure is compact, and the manufacturing cost is low, ensuring the pressing effect.

[0024] 3. The present invention is provided with a strain gauge on the outer wall of the main body to measure the acting force borne by the main body, so that the pre-tightening force received by the conductive gasket can be measured conveniently and quickly. Its operation is simple, the measurement is convenient, and the actual application effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0026] Figure 1 is a front sectional view of a device for testing the shielding performance of a conductive gasket provided by an embodiment of the present invention;

[0027] Figure 2 is Figure 1 a schematic structural diagram of the lower half part of the device for testing the shielding performance of the conductive gasket shown;

[0028] Figure 3 is Figure 1 a schematic structural diagram of the upper half part of the device for testing the shielding performance of the conductive gasket shown;

[0029] Figure 4 is Figure 1 a top view schematic diagram of the insulator in the device for testing the shielding performance of the conductive gasket shown;

[0030] Figure 5 is Figure 1 a top view schematic diagram of the measurement conductor in the device for testing the shielding performance of the conductive gasket shown;

[0031] In the figure: 1. Main body; 11. Accommodating cavity; 111. Upper cavity; 112. Lower cavity; 12. First through hole; 2. Injection connector; 21. Injection housing; 22. Injection conductive post; 3. Test connector; 31. Test housing; 32. Test conductive post; 4. Insulator; 41. Limit groove; 5. Measuring conductor; 51. Connection post; 52. Measuring table; 521. Accommodating groove; 6. Pressing assembly; 61. Sleeve; 611. Rib; 62. Pressing ring; 621. Driving groove; 7. End cover; 71. Second through hole; 72. Activity cavity; 8. Matching resistor; 9. Strain gauge; 10. Injection conductor. Specific embodiments

[0032] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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 and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0035] Embodiment 1:

[0036] As Figures 1 to 5As shown in the figure, an embodiment of the present invention provides a test device for the shielding performance of a conductive gasket, which includes a main body 1, an injection connector 2, and a test connector 3. The injection connector 2 includes an injection housing 21 and an injection conductive column 22, and the test connector 3 includes a test housing 31 and a test conductive column 32;

[0037] A receiving cavity 11 is provided at the top of the main body 1. An insulator 4 is provided in the receiving cavity 11, and a measuring conductor 5 for placing the conductive gasket is provided on the insulator 4. A first through hole 12 communicating with the receiving cavity 11 is provided outside the main body 1. The test housing 31 is installed on the main body 1, and the test conductive column 32 passes through the first through hole 12 and is connected to the measuring conductor 5;

[0038] A pressing assembly 6 is detachably connected in the receiving cavity 11. The pressing assembly 6 can perform relative displacement with the main body 1 and is used to apply a pre-tightening force to the conductive gasket;

[0039] The top of the pressing assembly 6 is movably connected with an end cover 7. The end cover 7 can perform relative displacement with the pressing assembly 6 along the axial direction of the main body 1. A second through hole 71 is provided at the top of the end cover 7. The injection housing 21 is installed on the end cover 7, and the injection conductive column 22 passes through the second through hole 71 and is connected to the measuring conductor 5 through a matching resistor 8.

[0040] It should be noted that the shielding performance test device in the present invention is completed jointly by the pulse source and the oscilloscope in the strong electromagnetic pulse test system; both the injection housing 21 and the test housing 31 can be installed on the end cover 7 and the main body 1 respectively through bolts, and their disassembly and assembly are convenient and easy to use.

[0041] During the test, the injection housing 21, the end cover 7, the pressing assembly 6, the conductive gasket to be measured, the measuring conductor 5, the matching resistor 8, and the injection conductive column 22 are electrically connected in sequence to form the entire injection loop. A current probe is provided in the injection loop to measure the injection current I, and a strong electromagnetic pulse is applied to the conductive gasket to be measured; the test housing 31, the main body 1, and the pressing assembly 6 are electrically connected in sequence to form an upper test loop, so as to measure the coupling potential at the upper end of the conductive gasket to be measured; the test conductive column 32 is electrically connected to the measuring conductor 5 to form a lower test loop, so as to measure the coupling potential U at the lower end of the conductive gasket to be measured.

[0042] According to the injection current I and the coupling potential U at the lower end of the conductive gasket, the calculation of the transfer impedance Z is realized, as shown in the following formula:

[0043] Z = U / I

[0044] Among them, the transfer impedance Z is the magnitude of the coupling potential per unit current on the conductive gasket and is the main parameter of the shielding characteristics of the conductive gasket, which does not change with the change of the pulse source and the measurement system.

[0045] It can be understood that the insulator 4 is used to achieve insulation between the upper and lower measurement circuits and support the measurement conductor 5, preventing direct contact between the two and avoiding the occurrence of a short - circuit situation. The matching resistor 8 is used to prevent the impedance of the entire injection circuit from being too small during the injection of a strong electromagnetic pulse, which may affect the pulse source, thus ensuring the safety of the test equipment.

[0046] During debugging, first place the conductive gasket on the measurement conductor 5, and then connect the pressing assembly 6 to the accommodating cavity 11 and adjust their relative displacement to make the pressing assembly 6 apply a pre - tightening force to the upper end of the conductive gasket to be measured. When the pre - tightening force on the conductive gasket to be measured reaches the required value, adjust the relative displacement between the end cap 7 and the pressing assembly 6 to make the end cap 7 drive the injection conductive post 22 to move, so that the matching resistor 8 connected to the injection conductive post 22 can be in close contact with the measurement conductor 5, thereby avoiding an open circuit in the injection circuit and ensuring the test effect.

[0047] By the above method, only by replacing the corresponding conductive gasket to be measured, it is possible to quickly and conveniently test the shielding characteristics of different conductive gaskets; only by adjusting the pre - tightening force applied by the pressing assembly 6 to the conductive gasket to be measured, it is possible to test the shielding characteristics of the conductive gasket under different pre - tightening force conditions. Its operation is simple, the test effect is stable, and it has great practical application value.

[0048] In this embodiment, the pressing assembly 6 includes a sleeve 61 and a pressing ring 62 sleeved outside the sleeve 61. The pressing ring 62 is movably connected to the accommodating cavity 11 and can perform relative displacement along the axial direction of the main body 1. The outer circumference of the sleeve 61 is provided with a rib 611 for pressing the conductive gasket.

[0049] It should be noted that during the test, the sleeve 61 only makes direct contact with the upper end of the conductive gasket through the rib 611. Although the conductive gasket is sleeved outside the sleeve 61, there is no contact therewith. This ensures that the measured coupling potential of the upper - end test circuit is for the upper end of the conductive gasket, rather than the inner side wall of the conductive gasket, thus ensuring the accuracy of the test.

[0050] Specifically, during debugging, adjust the displacement of the pressing ring 62, thereby adjusting the pressing force applied by the pressing ring 62 to the rib 611, and further adjusting the pre - tightening force applied by the rib 611 to the conductive gasket. It is easy to operate and ensures the pressing effect. Among them, the displacement of the pressing ring 62 can be achieved through an adjusting mechanism or through the cooperation between components, and no specific limitation is made here.

[0051] Preferably, the pressing ring 62 is threadedly connected to the accommodating cavity 11, and a plurality of driving grooves 621 are provided on the pressing ring 62.

[0052] During debugging, the operator inserts a finger into the driving groove 621, and then pushes the pressing ring 62 to rotate. Since the pressing ring 62 is threadedly connected to the accommodating cavity 11, it synchronously displaces, thereby adjusting the pressing force exerted by the pressing ring 62 on the convex rib 611. This method is simple in operation, compact in structure, low in manufacturing cost, and good in actual application effect.

[0053] In this embodiment, an active cavity 72 is provided at the bottom of the end cover 7, and the end cover 7 is threadedly connected to the sleeve 61 through the active cavity 72.

[0054] Specifically, during debugging, by rotating the end cover 7, the sleeve 61 can be gradually inserted into or withdrawn from the active cavity 72, thereby conveniently adjusting the relative displacement between the two. Its operation is simple, the structure is compact, and it is convenient for practical application.

[0055] In this embodiment, a strain gauge 9 is provided on the outer wall of the main body 1, and the strain gauge 9 is used to measure the pre-tightening force exerted by the pressing ring 62 on the conductive gasket.

[0056] It can be understood that during testing, the pressing ring 62 exerts a pressing force on the convex rib 611 on the sleeve 61, and the pressing ring 62 will also bear the resulting reaction force. Since the pressing ring 62 is threadedly connected to the accommodating cavity 11, the pressing ring 62 will transfer this reaction force to the main body 1; therefore, by measuring the force borne by the main body 1 through the strain gauge 9, the pre-tightening force received by the measured conductive gasket can be known. Its operation is simple, the measurement is convenient, and the actual application effect is good.

[0057] In this embodiment, it further includes an injection conductor 10 threadedly connected to the injection conductive post 22. A matching resistor 8 is provided at the bottom end of the injection conductor 10 to realize the connection between the injection conductive post 22 and the measurement conductor 5 and prevent damage caused by the short circuit of the pulse source.

[0058] Specifically, a threaded hole is provided on the injection conductor 10, and an external thread matching the threaded hole is provided outside the injection conductive post 22 to realize the threaded connection between the two, which improves the stability of the connection with the matching resistor 8 and solves the problem caused by the insufficient length of the injection conductive post 22.

[0059] Embodiment 2:

[0060] As Figures 1 to 5 shown, this embodiment provides a device for testing the shielding performance of a conductive gasket. The difference from Embodiment 1 is that the measurement conductor 5 includes a connecting column 51 and a measurement table 52 for placing the conductive gasket, and the connecting column 51 is threadedly connected to the test conductive post 32.

[0061] Specifically, the shape of the measuring table 52 is preferably a rectangle consistent with the conductive gasket to improve the structural compactness of the device. By providing the connecting column 51 and threadedly connecting the connecting column 51 to the test conductive column 32, the stability of the connection between the measuring conductor 5 and the test conductive column 32 can be improved, avoiding the occurrence of an open circuit in the lower measuring loop.

[0062] In this embodiment, the accommodating cavity 11 includes an upper cavity 111 for accommodating the insulator 4 and a lower cavity 112 for accommodating the test conductive column 32. The connecting column 51 is provided at the bottom of the measuring table 52, and the bottom end of the connecting column 51 is threadedly connected to the test conductive column 32 after passing through the insulator 4.

[0063] Specifically, the lower cavity 112 can keep the connecting column 51 and the test conductive column 32 at a sufficient distance from the main body 1, thereby reducing the probability of a short circuit occurring in the upper test loop and the lower test loop and improving the reliability of the measurement result.

[0064] In this embodiment, a limiting groove 41 matching the measuring table 52 is provided at the top of the insulator 4.

[0065] Specifically, during assembly, the measuring table 52 can be placed in the limiting groove 41 and thus be limited and fixed, which improves the structural stability of the device and facilitates disassembly and assembly.

[0066] In this embodiment, a receiving groove 521 for receiving the sleeve 61 is provided at the top of the measuring table 52.

[0067] It should be noted that after assembly, the receiving groove 521 does not come into direct contact with the sleeve 61 to avoid a short circuit in the injection loop.

[0068] Specifically, the receiving groove 521 is preferably circular and matches the sleeve 61, which can further improve the structural compactness of the device and has a good use effect.

[0069] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A conductive gasket shielding performance testing device, characterized in that Comprising: A main body (1), an injection connector (2) and a test connector (3), wherein the injection connector (2) includes an injection housing (21) and an injection conductive post (22), and the test connector (3) includes a test housing (31) and a test conductive post (32); A receiving cavity (11) is formed at the top of the main body (1). An insulator (4) is arranged in the receiving cavity (11). A measuring conductor (5) for placing a conductive gasket is arranged on the insulator (4). A first through hole (12) communicating with the receiving cavity (11) is formed outside the main body (1). The test housing (31) is installed on the main body (1), and the test conductive post (32) passes through the first through hole (12) and is connected to the measuring conductor (5); A pressing assembly (6) is detachably connected in the receiving cavity (11). The pressing assembly (6) can perform relative displacement with respect to the main body (1) to apply a pre-tightening force to the conductive gasket; The top of the pressing assembly (6) is movably connected with an end cap (7). The end cap (7) can perform relative displacement along the axis of the main body (1) with respect to the pressing assembly (6). A second through hole (71) is formed at the top of the end cap (7). The injection housing (21) is installed on the end cap (7), and the injection conductive post (22) passes through the second through hole (71) and is connected to the measuring conductor (5) through a matching resistor (8); The pressing assembly (6) includes a sleeve (61) and a pressing ring (62) sleeved outside the sleeve (61). The pressing ring (62) is movably connected with the receiving cavity (11) and can perform relative displacement along the axis of the main body (1). A rib (611) for pressing the conductive gasket is arranged on the outer periphery of the sleeve (61); The pressing ring (62) is threadedly connected with the receiving cavity (11), and a plurality of driving grooves (621) are arranged on the pressing ring (62); An activity cavity (72) is formed at the bottom of the end cap (7). The end cap (7) is threadedly connected with the sleeve (61) through the activity cavity (72).

2. The conductive gasket shielding performance testing device according to claim 1, wherein A strain gauge (9) is arranged on the outer wall of the main body (1). The strain gauge (9) is used to measure the pre-tightening force applied by the pressing ring (62) to the conductive gasket.

3. The conductive gasket shielding performance testing device according to claim 1, wherein It further includes an injection conductor (10) threadedly connected with the injection conductive post (22). A matching resistor (8) is arranged at the bottom end of the injection conductor (10) to realize the connection between the injection conductive post (22) and the measuring conductor (5).

4. The conductive gasket shielding performance testing device according to claim 1, wherein, The measuring conductor (5) includes a connecting column (51) and a measuring table (52) for placing a conductive gasket. The connecting column (51) is threadedly connected with the test conductive post (32).

5. The conductive gasket shielding performance testing device according to claim 4, characterized in that, The receiving cavity (11) includes an upper cavity (111) for placing the insulator (4) and a lower cavity (112) for accommodating the test conductive post (32); The connecting column (51) is arranged at the bottom of the measuring table (52). The bottom end of the connecting column (51) passes through the insulator (4) and is threadedly connected with the test conductive post (32).

6. The conductive gasket shielding performance testing device according to claim 4, wherein, A limiting groove (41) matching the measuring table (52) is formed at the top of the insulator (4).

7. The conductive gasket shielding performance testing device according to claim 4, wherein A receiving groove (521) for receiving a sleeve (61) is formed in the top of the measuring table (52).

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