Conductive gasket shielding effectiveness testing device based on shielding box

Abstract

The utility model relates to a conductive gasket shielding effectiveness testing device based on a shielding box, and the device comprises a small-window-method shielding box which is provided with a testing window on the front surface; the loading plate is arranged on the periphery of the test window; the pressure applying plate is aligned with the object carrying plate and is mounted on the object carrying plate through a fastening device; the pressing plate is a square flat plate, pins are arranged at four corners of the pressing plate, digital display spiral micrometer gauges are arranged in the middle positions of four sides of the front face of the pressing plate and are mechanically fixed on the four sides of the pressing plate through micrometer gauge fixing blocks, and distance measuring holes are further formed in the middle positions of the four sides of the pressing plate. The device can flexibly adapt to the installation requirements of conductive gaskets with different sizes. The pressing plate and the digital display spiral micrometer are used in cooperation, accurate control over the compression amount of the conductive gasket is achieved, and therefore accurate measurement of the shielding effectiveness of the conductive gasket in the real using state is simulated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electromagnetic testing device, especially a kind of shielding effectiveness measuring device for simulating the real use condition of conductive gasket. BACKGROUND

[0002] EMI (Electromagnetic Interference) gasket, namely EMI conductive gasket, is often used in the gap of electronic equipment cabinet, and its role is to ensure the electrical continuity of gap, effectively reduce the contact impedance generated at the discontinuous structure such as hole, gap and groove. In this way, it can reduce the voltage at both ends of the joint, thereby reducing the electromagnetic leakage at the gap. When selecting EMI gasket, both its shielding performance and high cost performance should be considered, but in the face of various EMI gaskets on the market, how to make appropriate selection has always been a difficult problem for designers. Therefore, objective evaluation of the shielding characteristics of various EMI gaskets is of great significance for gasket selection in practical application. SUMMARY

[0003] In order to solve the above technical problems, guide designers to select ideal conductive gasket, and help researchers to develop conductive gasket meeting various requirements, the utility model provides a kind of shielding effectiveness measuring device for conductive gasket based on shielding box. The device is simple to operate, not only supports testing of various specifications of conductive gasket, but also can accurately control and test compression amount, simulate real use condition, and ensure the effectiveness of measurement results.

[0004] The utility model solves the technical problems and adopts the technical scheme that a kind of shielding effectiveness testing device for conductive gasket based on shielding box, comprising:

[0005] Small window method shielding box, its front is provided with test window;

[0006] Object plate, set in the four corners of test window;

[0007] Pressure plate, align with object plate and install on object plate by fastening device;

[0008] Pressure plate, for square flat, four corners have pin, the middle position of four edges of front is provided with digital screw micrometer, and digital screw micrometer fixing block is mechanically fixed in the four edges of pressure plate, wherein the middle of the four edges of pressure plate is also provided with distance measuring hole.

[0009] Further, the small window method shielding box is provided with test window in front, for loading sample.

[0010] Further, object plate is fixed on shielding box window by screw, and object plate is square frame structure, with square hole in the middle, corresponding to test window.

[0011] Further, the four edges of the carrier plate are provided with gasket clamping grooves for embedding the conductive gasket.

[0012] Further, the four corners of the carrier plate are provided with positioning pin holes for the four corner pins of the pressing plate to align and use.

[0013] Further, the middle part of the pressing plate is provided with an insulating handle, and the four corners are provided with pins for inserting into the positioning pin holes of the carrier plate.

[0014] Further, the four edges of the pressing plate are provided with a plurality of insulating screws.

[0015] Further, the EMI conductive gasket is a square ring structure, which is adhered to the gasket clamping groove of the carrier plate through the self-provided adhesive.

[0016] Further, the carrier plate is made of metal.

[0017] Further, the insulating screw is a nylon screw.

[0018] Advantages

[0019] The utility model provides a kind of conductive gasket shielding effectiveness measuring device based on shielding box, and the device is simple to operate, not only supports multiple specifications of conductive gasket test, but also can accurately control and test compression amount, simulate real use condition, ensure the accuracy of measurement result, sample loading is convenient, improve work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model is further described below in conjunction with drawings and examples.

[0021] Figure 1 It is the EMI conductive gasket shielding effectiveness measuring device without sample structure diagram.

[0022] Figure 2 It is shielding effectiveness device test assembly drawing.

[0023] Figure 3 It is pressing plate structure drawing.

[0024] Figure 4 It is EMI conductive gasket pasting process schematic view.

[0025] Figure 5 It is EMI conductive gasket installation drawing.

[0026] Figure 6 It is EMI conductive gasket without compression state schematic view.

[0027] In the diagram: 01. Small window shielding box, 02. Loading plate, 03. Metal screw, 04. Pin, 05. Pressure plate, 06. Digital micrometer, 07. Insulating screw, 08. Insulating handle, 09. Gasket slot, 10. EMI conductive gasket, 11.

[0028] 12. Screw hole, 13. Pin hole, 14. Quick clamp, 15. Micrometer fixing block, 16. Distance measuring hole. Detailed Implementation

[0029] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] According to one embodiment of this utility model, a conductive pad shielding effectiveness testing device based on a shielding box is proposed, such as... Figure 1 As shown,

[0031] Includes: Small window shielding box 01, which has a test window on the front;

[0032] The test board 02 is positioned around the test window;

[0033] The pressure plate 05 is positioned and aligned with the load plate, and then installed on the load plate using a fastening device.

[0034] The shielded box 01 has a test window on its front, the test window being, for example, 30x30cm in size, used as a test window for loading samples. Figure 2 As shown, the carrier plate 02 is mechanically fixed to the window of the shielding box by countersunk screws 03. The carrier plate has a square frame structure with a square hole in the middle, corresponding to the test window. The four corners of the carrier plate are also equipped with positioning pin holes 12 for the four corner pins 04 of the pressure plate 05 to be aligned. During the shielding effectiveness test, the conductive pad is pressed against the four sides of the carrier plate. The four sides of the carrier plate are also provided with pad slots 09 for embedding the conductive pad.

[0035] like Figure 1 , 3 As shown, the pressure plate 05 is a square plate with pins 04 at the four corners. A digital micrometer 06 is installed in the middle of the four sides of the front, and is mechanically fixed to the four sides of the pressure plate by the micrometer fixing block 14. A distance measuring hole 15 is also opened in the middle of the four sides of the pressure plate. The micrometer measures the compression height of the EMI gasket through the distance measuring hole.

[0036] An insulating handle 08 is provided in the middle of the pressure plate 05, and pins 04 are provided at the four corners for positioning by inserting them into the positioning pin holes 12 of the carrier plate; multiple insulating screws 07 are provided on the four sides of the pressure plate 05.

[0037] like Figure 4, the EMI conductive gasket 10 is a square structure, which is adhered to the gasket clamping groove 09 of the carrier plate 02 through the self-adhesive, and the front view after being adhered is as shown in Figure 5 ;

[0038] The pin 04 of the four corners of the pressing plate 05 is inserted into the pin hole 12 of the carrier plate 02 through the insulating handle 08, and the insulating screw 07 of the four edges of the pressing plate 05 is pre-locked in the screw hole 11 of the carrier plate 02, and the process is stopped until the pressing plate 05 just contacts the EMI conductive gasket 10 without causing pressure. Adjust the digital screw micrometer 06 until the micrometer head contacts the carrier plate 02, and the value is zero at this time, that is, the EMI conductive gasket 10 is not compressed, as shown in Figure 6 .

[0039] First, the height of the EMI conductive gasket 10 compression amount required for testing is calculated, and then the digital screw micrometer 06 is adjusted to the value and locked, and the insulating screw 07 is screwed in to achieve the purpose of the pressing plate 05 compressing the EMI conductive gasket 10, that is, the shielding effectiveness of the EMI conductive gasket 10 can be measured.

[0040] Optionally, a quick clamp 13 is provided around the test window, which is fixed on the shielding box body through a screw, and can be used for simple and quick clamping, for example, for quickly clamping a material suitable for testing of large-size flat plates. In the shielding effectiveness test of the conductive gasket, the quick clamp device will not be used.

[0041] In one embodiment, a 0.3m x 0.3m window can be opened on the shielding chamber for testing, for example, the DR-S08 small window method opens a 0.3m x 0.3m window on the shielding box, and the carrier plate and the shielding box window are connected through metal screw fastening. In addition to the original high-efficiency shielding measures of the test window, good conductive contact between the two can be ensured. The whole carrier plate is made of hard and highly conductive metal, including but not limited to aluminum, copper, copper-nickel alloy and other materials to ensure good conductivity and minimal deformation; when the shielding effectiveness of the conductive gasket under different compression amounts in the use condition is tested, the conductive gasket can be uniformly stressed; the conductive gasket is installed in the carrier plate clamping groove through gluing or embedding; the four corners of the pressing plate are provided with positioning pins, which cooperate with the positioning holes in the four corners of the carrier plate to ensure simple installation and accurate position. The test area is the area between the carrier plate and the pressing plate, the pressing plate adopts a vertical force fastening method, and the compression amount of the measured conductive gasket is controlled through the adjusting device. In order to avoid the disturbance of the electromagnetic field by metal objects during testing, there should be no metal objects in the test area. The digital screw micrometer is provided at the center of the four edges of the pressing plate, which cooperates with the distance measuring hole on the pressing plate to realize accurate control of the compression amount, and accurate shielding effectiveness measurement of EMI conductive gaskets of different models and different specifications can be realized.

[0042] In conclusion, the utility model discloses a test device for measuring the shielding effectiveness of EMI gasket of different models and different specifications. The test frequency range of the small window shielding box covers 1GHz to 40GHz or a higher frequency range, has a shielding effectiveness of more than 110dB, and has sufficient measurement dynamics to ensure the accuracy of the shielding effectiveness measurement of the conductive gasket. The utility model can flexibly adapt to the installation requirements of conductive gaskets of different sizes. The cooperation of the pressure plate and the digital screw micrometer realizes the accurate control of the compression amount of the conductive gasket, thereby simulating the accurate measurement of the shielding effectiveness of the conductive gasket in the real use state.

Claims

1. A device for testing the shielding effectiveness of conductive pads based on a shielding box, characterized in that... include: The small window shielding box (01) has a test window on its front; The test board (02) is set around the test window; The pressure plate (05) is aligned with the load plate and mounted on the load plate by means of a fastening device; The pressure plate (05) is a square plate with pins (04) at the four corners. A digital micrometer (06) is installed in the middle of the four sides of the front. It is mechanically fixed to the four sides of the pressure plate by the micrometer fixing block (14). A distance measuring hole (15) is also opened in the middle of the four sides of the pressure plate.

2. The conductive pad shielding effectiveness testing device based on a shielding box according to claim 1, characterized in that, The small window shielding box (01) has a test window on the front for loading samples.

3. The conductive pad shielding effectiveness testing device based on a shielding box according to claim 1, characterized in that, The test plate (02) is fixed to the window of the shielding box by screws. The test plate has a square frame structure with a square hole in the middle, which corresponds to the test window.

4. The conductive pad shielding effectiveness testing device based on a shielding box according to claim 1, characterized in that... include: The four sides of the carrier plate are also provided with pad slots (09) for embedding conductive pads.

5. The conductive pad shielding effectiveness testing device based on a shielding box according to claim 1, characterized in that... include: The four corners of the carrier plate are also equipped with positioning pin holes (12) for the four corner pins (04) of the pressure plate (05) to be aligned. During the shielding effectiveness test, the conductive pad is pressed on the four sides of the carrier plate.

6. The conductive pad shielding effectiveness testing device based on a shielding box according to claim 1, characterized in that... include: An insulating handle (08) is provided in the middle of the pressure plate (05), and pins (04) are provided at the four corners for positioning by inserting them into the positioning pin holes (12) of the carrier plate.

7. The conductive pad shielding effectiveness testing device based on a shielding box according to claim 1, characterized in that... include: The pressure plate (05) has multiple insulating screws (07) on its four sides.

8. The conductive pad shielding effectiveness testing device based on a shielding box according to claim 1, characterized in that... include: The EMI conductive pad (10) has a square ring structure and is attached to the pad slot (09) of the carrier plate (02) with self-adhesive backing.

9. A conductive pad shielding effectiveness testing device based on a shielding box according to claim 1, characterized in that... include: The carrier plate is made of metal.

10. A conductive pad shielding effectiveness testing device based on a shielding box according to claim 7, characterized in that... include: The insulating screw is a nylon screw.

Images