KR101530336B1

KR101530336B1 - Electromagnetic wave absorber test equipment for electromagnetic anechoic chamber

Info

Publication number: KR101530336B1
Application number: KR1020140077436A
Authority: KR
Inventors: 엄형욱
Original assignee: 엄형욱
Priority date: 2014-06-24
Filing date: 2014-06-24
Publication date: 2015-06-22

Abstract

The present invention discloses an electromagnetic wave absorber testing device of an electromagnetic wave nonreflecting chamber capable of testing electromagnetic wave suitability. An electromagnetic wave nonreflecting chamber of the present invention includes an electromagnetic wave absorber in the ceiling and inner wall and is used to test the electromagnetic wave suitability of all kinds of devices by including an electromagnetic wave absorber module on a part of the floor to be able to be mounted and released. The electromagnetic wave absorber testing device comprises; a driving room which is formed under the floor of the nonreflecting chamber and has an opening connected inside the nonreflecting chamber at one side; a loading frame which is installed in the driving room and loads a plurality of electromagnetic wave absorber modules of different purpose on one side which is dislocated with the opening to be stepped; a ground panel which is loaded with the electromagnetic wave absorber modules on one side of the loading frame to be stepped and closes the opening of the driving room; a plurality of loaders which horizontally move to the lower side of the driving room by loading the electromagnetic wave absorber modules and the ground panel and has a penetration hole; a plurality of horizontal moving units which moves the loaders back and forth in an interval with the lower side of the opening of the driving room; and a pantograph type flexible elevating unit which is installed on the lower bottom of the opening of the driving room and raises and lowers the electromagnetic wave absorber modules and the ground panel by passing through the penetration hole. The present invention simply and rapidly tests the electromagnetic wave suitability of various devices without regard to the type of tested target device or testing code.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave absorber test apparatus for an electromagnetic anechoic chamber,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave immunity test for electromagnetic compatibility (EMC) of various electronic and communication devices, and more particularly, to an electromagnetic immunity test of a device, Site SVWR (hereinafter referred to as "SVSWR" The present invention relates to an electromagnetic wave absorber testing apparatus of an electromagnetic anechoic chamber which is capable of quickly and easily installing each electromagnetic wave absorber installed for absorbing electromagnetic waves from a ground floor in an anechoic chamber when a test such as U is performed.

As the concern about the harmfulness of electromagnetic waves is heightened, it is possible to minimize the generation of leakage electromagnetic waves for various products, such as electric and electronic devices such as mobile phones, broadcasting communication devices, home appliances, automobiles, industrial and household appliances, It is strictly regulated to protect itself.

In particular, wireless devices intentionally emit a designated radio wave. When a radio device is not emitting radio waves, the radio device itself acts as a general broadcast communication device such as a computer or a broadcast receiver, so that frequency interference and protection from electromagnetic waves Is urgently required.

As a result, electromagnetic compatibility standards for various devices have been prepared, and tests such as electromagnetic wave generation and prevention of electromagnetic interference have been conducted according to the test procedure. The test is designed to test the compliance of the test object by placing the test object in an anechoic chamber free of electromagnetic reflections and emitting a test radio wave to the standard transmit antenna for evaluation, Method is being used.

The electromagnetic anechoic chamber has a structure in which the electromagnetic wave absorber is mounted so that there is no gaps on the ceiling and four walls for accurate testing and the electromagnetic wave absorber module is installed on the floor at the bottom to minimize the reflection of the test radio wave inside the anechoic chamber .

In the case of the floor of the anechoic floor, not only the object to be tested but also the moving section of the operator is secured. Therefore, the fixed shielding wall can be constructed on the floor so that only a proper size of the radio wave absorber module can be used Because.

Therefore, according to the test item, the operator had to transfer the radio wave absorber directly to the floor of the anechoic chamber, and in particular, the anechoic chamber was subjected to various kinds of tests. There was a troublesome problem of replacing another radio wave absorber by a worker and a test time loss problem.

On the other hand, Patent Document 1 discloses an electromagnetic wave absorber testing apparatus for solving the above-mentioned problem of general anechoic chamber.

This technique has a horizontal conveying device that horizontally reciprocates the shielding module between the shielding device mounting part and the elevating frame and the finishing panel vertically spaced apart from each other, So that the shielding module can be easily installed.

However, this technology has various problems as follows.

First, since only one shielding module is installed between the finishing panel closing the opening of the shielding device installation part and the lift frame, it is not possible to effectively cope with various tests of the test target device, and the test target device is limited.

Secondly, even if a plurality of horizontal transfer devices are provided in a layered manner between the finishing panel and the lifting and lowering frame to have a plurality of different shielding modules, the shielding device mounting portion must be structured so as to be deeply structured by the rack screws, Time is so long that it can not be a proper solution.

Thirdly, when a plurality of shielding apparatuses are installed for testing various apparatuses, the size of the anechoic chamber becomes excessively large and the cost increases depending on the number of installed apparatuses, which is not an appropriate solution.

Fourth, since it has a complicated driving mechanism of "lift frame lift-up → horizontal transfer device withdrawal → return to horizontal transfer device → fall-down frame descent", the installation and disassembling time of the shielding module is considerably long.

Fifth, since the shielding module is transported to the floor of the anechoic chamber and the shielding device opening is closed by the finishing panel, the size of the anechoic chamber is as large as the installation space of the shielding module.

1. Korean Patent No. 10-1026499

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art described above, and it is an object of the present invention to provide an electromagnetic wave absorber capable of easily and quickly testing electromagnetic compatibility of various devices, And to provide a testing apparatus.

It is another object of the present invention to provide an electromagnetic wave absorber testing apparatus capable of compactly configuring an electromagnetic wave free chamber and easily installing and dismounting the electromagnetic wave absorber required for the test with a simple drive mechanism will be.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided an apparatus for testing an electromagnetic wave absorber according to the present invention, which comprises a ceiling and an electromagnetic wave absorber on an inner wall thereof, BACKGROUND ART [0002] In electromagnetic waves used for testing electromagnetic compatibility of various devices such as cellular phones,

A drive chamber formed under the floor of the anechoic chamber and having an opening communicating with the inside of the anechoic chamber on one side; A stacking frame which is provided in the drive chamber and on which a plurality of radio wave absorber modules whose applications are different from each other are stacked on one side; A ground panel which is stacked on one side of the stacking frame with the radio wave absorber module and closes the opening of the driving room; A plurality of mounting frames each having a plurality of electromagnetic wave absorber modules and a ground panel and horizontally moving to a lower portion of the drive room and having through holes; A plurality of horizontally moving means for horizontally reciprocating each of the loading frames between the lower portion of the drive chamber opening and the lower portion; And a pantograph-type expansion / contraction raising / lowering means provided on the bottom floor of the opening of the drive chamber and passing through the penetration hole of the mounting frame to raise and lower the wave absorber module and the ground panel.

According to a preferred aspect of the present invention, the opening inner surface of the drive chamber is formed of a larger inclined surface with the lower edge, the upper edge of the electromagnetic wave absorber module and the ground panel is formed as an inclined surface corresponding to the inner surface of the opening, A copper plate spring is provided on the inner surface to improve the electromagnetic wave shielding ratio by elastic contact between the two.

According to another preferred feature of the present invention, the horizontal moving means includes: a guide rail horizontally installed on a stacking frame; a roller mounted on the mounting frame and moving along the guide rail; and an infinite A drive motor for reciprocatingly rotating the endless track in a predetermined stroke, and a limit switch for controlling the drive motor by detecting a movement position of the mount frame.

According to another preferred feature of the present invention, a manhole is further provided on one side of the floor of the anechoic chamber, and a ladder is provided at a lower portion of the manhole of the driving room to assist the operator in and out.

The inner surface of the opening of the manhole is also formed with a larger inclined surface at the lower edge, a top edge of the lid of the manhole is formed of an inclined surface corresponding to the inner surface of the opening, and a copper spring is provided at the inner surface of the opening of the manhole, desirable.

According to the electromagnetic wave absorber testing apparatus of the present invention having such a structural feature, since a plurality of different radio wave absorber modules and the ground panel are mounted in layers below the floor of the anechoic chamber, So that it can be easily moved and installed.

Accordingly, there is an advantage that the electromagnetic compatibility of various devices can be tested very easily and quickly without being affected by the type of the electromagnetic wave test subject or the test items.

In addition to the vertical movement of the radio wave absorber module and the ground panel mounted under the floor of the anechoic chamber using a pantograph-type flexible lifting means, the radio wave absorber module, etc., Since the installation of the radio wave absorber module is completed by exposing the radio wave absorber module, the electromagnetic wave anechoic chamber can be compactly constructed, and the driving mechanism is also simple, so that the radio wave absorber module required for the test can be quickly installed and dismantled in the non-return room.

Further, the electromagnetic wave that can leak from the opening portion can be more completely blocked by the attachment of the copper plate spring, in addition to the wide contact with the opening portion formed on the floor of the anechoic chamber.

1 is a cross-sectional view schematically showing a state in which an electromagnetic wave absorber testing apparatus according to the present invention is installed in an electromagnetic anechoic chamber,
2 is a front view of the electromagnetic wave absorber testing apparatus according to the present invention,
3 is a side view of the electromagnetic wave absorber testing apparatus according to the present invention,
4 is a plan view taken along line IV of Fig. 2,
5 is a side cross-sectional view showing a horizontal moving means main part of the electromagnetic wave absorber testing apparatus of the present invention,
6 is a front view showing an expansion and contraction device of the electromagnetic wave absorber testing device of the present invention,
7A to 7C are front views schematically showing an operating state of the electromagnetic wave absorber testing apparatus of the present invention.

These and other features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

In the drawings, the same reference numerals are applied to the same names.

1 to 4, an electromagnetic wave absorber testing apparatus 1 according to the present invention includes a drive chamber 2 formed below a floor F of an anechoic chamber C with an opening 3, A mounting frame 10 mounted on the drive chamber 2 for mounting a plurality of radio wave absorber modules M different in use in layers on one side of the mounting frame 10; And a plurality of electromagnetic wave absorber modules M and a ground panel G are mounted so as to cover the opening 3 of the drive chamber 2, A plurality of horizontally moving means 30 horizontally reciprocating between the mounting frame 20 and the lower portion of the opening 3 of the drive chamber 2, And a stretching and raising means 40 provided on the bottom of the opening 3 of the drive chamber 2 for raising and lowering the wave absorber module M and the ground panel G. [

The electromagnetic wave absorber A is densely arranged on the ceiling and four wall surfaces as in the known art and a turntable T on which a device P to be tested is mounted is provided on one side of the bottom F, Respectively. The turntable T is flush with the bottom F of the anechoic chamber C.

Although not shown, a transmission antenna for transmitting a test pattern of a predetermined pattern to the device P to be tested is provided at one side of the anechoic chamber C, and a reception antenna for receiving the radio wave transmitted from the transmission antenna is installed at the other side .

The drive chamber 2 is constructed by excavating under the floor F of the anechoic chamber C and is provided with a square opening 3 so as to communicate with the inside of the anechoic chamber C on one side where the turntable T is not provided . The opening (3) is formed in the vicinity of the turntable (T).

The opening 3 of the driving chamber 2 is formed as an inclined surface whose lower edge is larger than the upper edge as shown in an enlarged view in Fig. 3, and the corresponding radio wave absorber module M and the ground panel G, The upper edge of the base (B) A copper plate spring 3a is installed in the opening 3 to improve the adhesion between the opening 3 and the base 3B of the electromagnetic wave absorber module M and the base B of the ground panel G Thereby minimizing the leakage of electromagnetic waves through the clearance of the opening 3.

A manhole 4 is provided adjacent to the opening 3 of the drive chamber 2 so as to be able to move into and out of the drive chamber 2 in the anechoic chamber C and the drive chamber 2 Is provided with a ladder 5 for assisting the worker in and out.

4, the opening 4a of the manhole 4 also has an inclined surface whose lower edge is larger than the upper edge, and the upper end edge of the corresponding manhole cover 4b is also formed of an inclined surface of the same inclination do. The inclined opening 4a of the manhole 4 is provided with a copper plate spring 6 so as to increase the airtightness of the both, thereby minimizing the electromagnetic wave leakage through the manhole 4. [

The stacking frame 10 is constructed by connecting a plurality of posts 11 and crossbars 12 in a lattice form, and preferably has a truss structure for structural stability. The stacking frame 10 is provided over the entire driving chamber 2 and is disposed at a position out of the opening 3 of the drive chamber 2, that is, below the turntable T, G) as a layer.

The mounting frame 20 has a square shape corresponding to the radio wave absorber module M and the ground panel G and has a through hole 21 at the center so that the expansion and contraction means 40 can pass through. Accordingly, the mounting frame 20 supports the lower edge portions of the electromagnetic wave absorber module M and the ground panel G so as to support them, 22).

As shown in FIG. 5, the mounting projections R protruding from the lower edge of the base (B) of the radio wave absorber module M and the ground panel G are inserted into the mounting grooves 21 of the mounting frame 20 It is possible to maintain a stable mounting state without flowing or leaving.

The horizontal conveying means 30 is provided corresponding to the number of the plurality of radio wave absorber modules M1, M2 and the ground panel G, respectively.

5, the horizontal conveying means 30 includes a guide rail 31 installed horizontally in the loading frame 10, rollers 32 installed on the loading frame 20 and running along the guide rail 31, An endless track 33 connected to the mounting frame 20 and a driving motor 34 for sensing the movement of the mounting frame 20 to reciprocate the endless track 33 in a predetermined stroke, And a limit switch 35 for controlling the limit switch 35.

The guide rails 31 are fixedly supported by brackets 36 on both inner sides of the stacking frame 10 opposite to each other and a plurality of rollers 32 are arranged and spaced on both sides of each of the stacking frames 20 do.

The endless track 33 is installed along the guide rails 31 on both sides of the loading frame 10 so long as the loading frame 20 can be positioned below the opening 3 of the driving chamber 2, Unlike the rail 31, it may be provided only a certain length from one end of the stacking frame 10.

The endless track 33 may be configured in various forms, but it may be desirable to have a chain for strong and accurate driving.

The driving motor 34 is capable of forward and reverse driving and is installed in the loading frame 10 and connected to the endless track 33 via the speed reducer 34a and stops according to the signal of the limit switch 35.

The stretching and raising means 40 is installed on the floor below the opening 3 of the drive chamber 2. 6, the stretching and raising means 40 includes a fixing plate 41 fixed to the bottom of the driving chamber 2 and a fixing plate 41 fixed to the bottom of the electromagnetic wave absorber module M through the through hole 21 of the mounting frame 20. [ A support plate 42 for contacting and supporting the lower portion of the ground panel G and a pantograph 43 in which a plurality of link plates 43a are continuously hinged in an X shape and a cylinder 44 for expanding and contracting the pantograph 43 .

Guide slots 41a and 42a are elongated in the horizontal direction so that the pantograph 43 can be expanded and contracted on a corresponding one of the fixing plate 41 and the supporting plate 42. [

One end of the pantograph 43 is hinged to the fixing plate 41 and the supporting plate 42. One of the two link plates 43a is inserted into the guide slots 41a and 42a of the fixing plate 41 and the supporting plate 42, Thereby sliding along with it.

The rear end of the cylinder 44 is hinged to the fixing plate 41, and the piston rod 44a is hinged to the pantograph 43. [

Next, the operation of the electromagnetic wave absorber testing apparatus according to the present invention constructed as described above will be described in conjunction with Figs. 7A to 7B.

7A shows a state in which the ground panel G closes the opening 3 of the drive chamber 2. In FIG. Although not shown separately here, the stretching and raising means 40 shown in Fig. 6 supports the ground panel G from the lower side.

In this state, the device P to be tested is placed on the turntable T, and the ground panel G and the predetermined radio wave absorber modules M1 and M2 are placed in an anechoic state according to the type of the device P and the test items. (Not shown) to radiate radio waves within the anechoic chamber C after the antenna 3 is positioned in the opening 3 of the bottom F of the antenna C to test electromagnetic compatibility.

At this time, when a predetermined radio wave absorber module M1 is required, if the radio wave absorber module M1 is selected by a controller (not shown), the cylinder rod 44a, which is the advanced state of the expanding and raising means 40, It returns to the initial state and retreats. As a result, the extended pantograph 43 is contracted and the ground panel G is lowered into the drive chamber 2. [

The ground panel G is placed on the mounting frame 20 supported by the guide rail 31 immediately below the opening 3 and the support plate 42 of the expansion and contraction means 40 is mounted on the mounting frame 20, Passes through the through hole (21) of the frame (20) and is further lowered to the lower portion, whereby the mounting frame (20) becomes movable.

Then, the driving motor 34 of the horizontal moving means 30 corresponding to the mounting frame 20 is driven in the reverse direction to rotate the endless track 33 in the counterclockwise direction. Then, the mounting frame 20 is moved to the left along the guide rail 31, so that the ground panel G is loaded on the stacking frame 10.

The driving motor 34 of the horizontal moving means 30 corresponding to the selected radio wave absorber module M1 is driven in the forward direction to rotate the endless track 33 in the clockwise direction, And moves along the guide rail 31 in the rightward direction. When the radio wave absorber module M1 reaches directly below the opening 3, the limit switch 35 stops the drive motor 34. [

Then, the cylinder 44 of the stretching and raising means 40 is actuated, and the cylinder rod 44a is stretched, thereby stretching the pantograph 43. 7B, the supporting plate 42 vertically ascends and supports the radio wave absorber module M1 while passing through the through hole 21 of the mounting frame 20, and thereby the radio wave absorber module M1 selected as shown in FIG. (F) of the anechoic chamber (C) through the opening (3).

On the other hand, when another radio wave absorber module M2 is installed in accordance with the type of device P or the test item, the other radio wave absorber module M2 is moved to the anechoic chamber C The user can easily expose to the floor F of the vehicle.

In this embodiment, two radio wave absorber modules (M) are provided. However, the present invention is not limited to this, and the number of the radio wave absorber modules M may be increased as necessary.

C: Anechoic chamber P: Appliances
M: Radio wave absorber module G: Ground panel
B: Base R: Mounting projection
2: drive chamber 3: opening
3a, 4a: Copper spring 4: Manhole
10: Loading frame 20: Mounting frame
21: through hole 22: seat groove
30: Horizontal moving means 31: Guide rail
32: roller 33: endless track
34: drive motor 35: limit switch
40: stretching and elevating means 41: fixed plate
42: support plate 43: pantograph
44: Cylinder

Claims

An electromagnetic wave absorber testing apparatus used for testing the electromagnetic compatibility of various devices such as electric and electronic products and cellular phones by providing a radio wave absorber module on the ceiling and an inner wall and mounting or disassembling the radio wave absorber module on a part of the floor In this case,
A drive chamber formed under the floor of the anechoic chamber and having an opening communicating with the inside of the anechoic chamber on one side;
A stacking frame installed in the drive room for mounting a plurality of the radio wave absorber modules different in purpose on one side in a layered manner;
A ground panel mounted on one side of the mounting frame in a layered manner with the radio wave absorber module and closing an opening of the driving room;
A plurality of mounting frames mounted on the plurality of radio wave absorber modules and the ground panel and moving horizontally under the driving room, each having a through hole;
A plurality of horizontally moving means for horizontally reciprocating the respective loading frames between the lower portion of the drive chamber opening and the lower portion;
And a pantograph-type expansion / contraction elevating means installed on a bottom floor of the opening of the drive chamber for moving up and down the electromagnetic wave absorber module and the ground panel through the through hole of the mounting frame. Device.

The method according to claim 1,
Wherein an inner surface of the opening of the driving chamber is formed with a larger inclined surface with a lower edge, an upper edge of the ground panel is formed of an inclined surface corresponding to an inner surface of the opening, and a copper spring is provided on an inner surface of the driving room opening. The electromagnetic wave absorber test apparatus of the electromagnetic anechoic chamber.

[2] The apparatus according to claim 1,
An endless track installed on the loading frame and connected to the loading frame; and a control unit for moving the endless track in a predetermined stroke And a limit switch for sensing the moving position of the mounting frame and controlling the driving motor.

The method according to claim 1,
Wherein the manhole is further provided on one side of the floor of the anechoic chamber, and a ladder is provided under the manhole of the driving chamber.

The method of claim 4,
Wherein an inner surface of the opening of the manhole is formed with a larger slope and a top edge of the manhole is formed with an inclined surface corresponding to an inner surface of the opening and a copper spring is provided on an inner surface of the opening of the manhole Electromagnetic wave absorber testing apparatus for electromagnetic anechoic chambers.

The method according to claim 1,
Wherein a mounting groove is formed on an upper surface of the mounting frame, and a mounting protrusion is formed on a bottom surface of the electromagnetic wave absorber module and the ground panel to be fitted into the mounting groove.