CN2494101Y

CN2494101Y - Electromagnetic shielding casing

Info

Publication number: CN2494101Y
Application number: CN 01231079
Authority: CN
Inventors: 庄振宇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2001-07-27
Filing date: 2001-07-27
Publication date: 2002-05-29
Anticipated expiration: 2011-07-27

Abstract

The utility model relates to a box in communication equipments, and discloses a box with medium electromagnetic shielding efficiency which consists of two side plates, front aperture beams perpendicular to the side plates, back aperture beams perpendicular to the side plates used to install a backplane (i.e. a dorsal printed circuit board), a shielding cover plate over the box and a back cover plate at the back of the box. The characteristics thereof include: the upper and lower ends of the back cover plate are provided with an inwardly kinked bending hem; the external side of the bending hem is provided with a downwardly kinked little hem; the two ends of the bending hem are provided with a downwardly kinked little folded block perpendicular to the bending hem; shielding materials are arranged on the little hem and on the lateral side of the little folded block. The back cover plate in the box can be fixedly connected to the upper and lower back aperture beams so that the electromagnetic shielding requirement of the posterior electromagnetic shielding box can be satisfied. The utility model has advantages of optimal structure, simple assembly, good appearance and superior shielding efficiency.

Description

Electromagnetic casing screen

Technical field

The utility model relates to the casing in the communication apparatus, relates in particular to a kind of casing with electromagnet shield effect.

Background technology

Interference-free for guaranteeing the circuit function in the casing, must carry out electromagnetic shielding to circuit.Therefore, the casing of encirclement electronic devices and components mainly is made of the metal cabinet parts.Will set up conduction continuous, that do not have to be interrupted and connect between metal parts, especially the conduction of setting up between each parts by the rubber-like shielding material connects.

In the electromagnetic casing screen of existing communication equipment, the rear cross beam 107, mount angle 102, shielding cover board 106, back shroud 105, the back bent angle 104 that are typically provided with side plate 103, front beam 108, the rear cross beam 101 that backboard (being the dorsal part printed circuit board) is installed, mounting rear cover plate are formed, as shown in Figure 1, provided wherein a kind of structural representation of casing; After the front end of casing is loaded onto plug-in unit and Handle Bar, can form the electromagnetic shielding metal cabinet of sealing.

In above-mentioned body structure, being used for the back shroud 105 of closed box is to adopt screw to be installed on the rear cross beam 107, as shown in Figure 2, because 107 grades of installing spaces of living backboard of rear cross beam of mounting rear cover plate 105, thereby make backboard be difficult to the casing of packing into, when twisting the trip bolt of installing on the backboard, must twist sideling, not meet working specification.Therefore, when backboard was installed, the back shroud 105 of must dismantling, shielding cover board 106 and rear cross beam 107 could be installed backboard or the machinery of the installation of backboard and subrack assembled and carry out simultaneously, and this can cause great inconvenience to the Assembling Production of casing.In addition, the shielding cover board front end of existing electromagnetic casing screen and front beam interface, the rear cross beam interface of rear end and mounting rear cover plate, the centre strides across from the top of the rear cross beam of installation backboard, this is restricted the rear cross beam height that backboard is installed, do not have enough spaces to leave notch nut strip is installed, can only on material is the crossbeam 101 (comprising entablature and sill) of aluminium alloy, open screwed hole 301 backboards are installed, as shown in Figure 3, this is complex process not only, and because aluminum alloy material is softer, easy stripped thread when twisting screw and cause overall beam to be scrapped is in above-mentioned body structure, pull down back shroud as need, the mounting screw that must take off back shroud from the side of casing just can take off back shroud, and the dismounting effort is time-consuming, is not easy to maintenance.

The utility model content

A technical problem to be solved in the utility model is: design a kind of electromagnetic casing screen, back shroud can closely be connected with the rear cross beam that backboard is installed, can satisfy the electromagnetic shielding requirement at electromagnetic casing screen rear portion, optimize body structure, reduce and form member, assembling is simple, good looking appearance, shield effectiveness are good; Another technical problem to be solved in the utility model is: when the maintenance backboard, can make the dismounting of back shroud more convenient and quick, thereby improve overhaul efficiency.

The technical scheme that the utility model provides is: a kind of electromagnetic casing screen is provided, comprise biside plate, the front beam vertical with described side plate, the vertical rear cross beam that is used to install backboard (being the dorsal part printed circuit board) with side plate, be positioned at the shielding cover board and the back shroud that is positioned at the casing rear side of casing top, it is characterized in that, the last bottom of described back shroud has the bending edge that bends inwards, after the two ends of described bending edge stretch out, be bent to form a little folded block vertical downwards with bending edge, the top, edge of described bending edge is provided with the shielding material that raises up, described little folded block is provided with the shielding material to outer lug, also be provided with L type angle Support in the side plate inboard of casing, described back shroud be connected with L type angle Support with screw.

The electromagnetic casing screen that provides by the utility model, compare with former casing and to have following advantage: by on the back shroud of casing, bending edge being set, can be with the rear cross beam cancellation that is used for mounting rear cover plate that is provided with in the former casing, thus utilize on the back shroud bending edges and little folded block on shielding material closely contact the shielding that assurance conducts realization electromagnetic casing screen rear portion with crossbeam, side plate in the casing.This has not only solved the problem that the backboard difficulty is installed, and make the rear cross beam up and down that backboard is installed have enough spaces to leave notch to come the loading nut bar, have favorable manufacturability and reliability, when assembling, back shroud is connected with angle Support, during as need dismounting bonnet, can directly take off attachment screw and can take off back shroud, easy disassembly and maintenance from the back side of back shroud.

Description of drawings

Fig. 1 is former body structure schematic diagram;

Fig. 2 is the assembling schematic diagram of back shroud and casing among Fig. 1;

The local enlarged diagram that Fig. 3 is connected with shielding cover board for the rear cross beam that backboard is installed among Fig. 1;

Fig. 4, Fig. 5 are the structural representation and the partial enlarged drawing of back shroud in the utility model casing;

Fig. 6, Fig. 7 are the assembly structure exploded view and the partial enlarged drawing of the utility model casing.

Specific embodiment

As Fig. 4, Fig. 5, shown in Figure 6, the electromagnetic casing screen that provides by the utility model, be provided with biside plate 10, with biside plate 10 vertically disposed front beams 11, with the side plate 10 vertical rear cross beams 6 that are provided for installing backboard (being the dorsal part printed circuit board), be positioned at the shielding cover board 12 and the back shroud 9 that is positioned at the casing rear side of casing top, the last bottom of back shroud 9 bent inwards respectively form two bending edges 14,15, outer side edges with two bending edges is bent to form a baby hem 16 that is used to install shielding material 4 to the box inside two-stage again, 17, and with bending edge 14, after 15 two ends stretch out, be bent to form one and bending edge 14 again, 15 perpendicular little folded blocks 13 (as shown in Figure 4, totally four little folded blocks, not shown in the figures complete), for guaranteeing that back shroud 9 contacts with upper cover plate 12 favorable conductive, baby hem 16, shielding material 4 on 17 is the shape that raises up, for guaranteeing that back shroud 9 contacts with biside plate 10 favorable conductive, also be provided with shielding material 5 in the outside of four little folded blocks 13 to outer lug.

Reliable for guaranteeing contact, the shielding material 4 that is adopted, 5 adopt the rubber-like shielding material, can adopt conducting resinl, conductive fabric or metal clips are made

shielding material

4,5,

shielding material

4,5 with bending edge 14,15 with being connected of little folded block 13 can be according to the difference of shielding material, adopt the mode of stickup or setting-in to connect, as shielding material 4 are the conducting resinls that adopt strip, with bending edge 14,15 connection can be adopted in the method for paste and be connected, shielding material 5 can adopt a kind of metal clips, can adopt the mode of setting-in to connect with being connected of little folded block 13, can on little folded block 13, make groove, shielding material 5 is fastened in the groove get final product again.

The mounting structure of back shroud 9 and casing as shown in Figure 6, for ease of loading and unloading back shroud 9 and maintenance backboard, can set up two L type angle Supports 1 in the inboard of back shroud 9, be connected with the inside edge of box side 10 with the side of screw angle Support 1, with screw back shroud 9 is connected with another side of angle Support 1, this syndeton can make when dismounting back shroud 9, need not reach attachment screw from the side of biside plate 10, but directly take off attachment screw with angle Support 1 from the back side of back shroud 9, can pull down back shroud 9, make things convenient for later maintenance; For guaranteeing shielding properties, angle Support 1 and side plate 10 and back shroud 9 adjacent both sides of the edge on all post shielding material 2, simultaneously, electromagnetic casing screen has been cancelled the rear cross beam 107 that former back shroud is installed, but be provided with long flange 3 at the rear cross beam up and down 6 that backboard is installed, back shroud 9 in the utility model casing is in loading procedure, it is bending edge 14 up and down, 15 can place flange 3 below, the shielding material 4 of its top, edge forms with flange 3 in the rear cross beam up and down 6 that backboard is installed and closely contacts, and four jiaos of the biside plate 10 of the shielding material 5 on four little folded blocks 13 and casing closely contact, whole back shroud 9 usefulness screws are installed on the angle Support 1 and get final product, because angle Support 1 posts shielding material 2, guaranteed to contact, so only need beat the shielding requirements that a small amount of screw can satisfy casing with the good of back shroud 9.

Owing to cancelled the rear cross beam 107 of mounting rear cover plate, make the installation of backboard and fasteningly no longer interfered.Simultaneously, the shielding cover board 12 of electromagnetic shielding subrack can not stride across the rear cross beam up and down 6 that backboard is installed, and the height dimension of backboard can be bigger, and this installs nut strip 8 with regard to enough spaces have been arranged, need not be on rear cross beam drilling and tapping, improved reliability.

The casing that is provided by the utility model can be with rear cross beam 107 cancellations of original mounting rear cover plate, and utilize shielding material on the back shroud bending edges closely to contact and guarantee to conduct with crossbeam, the side plate of casing, thus the shielding at realization electromagnetic casing screen rear portion.This has not only solved the problem that the backboard difficulty is installed, and the rear cross beam that is used to install backboard has enough spaces to leave notch loading nut bar, make casing have favorable manufacturability and reliability,, made things convenient for the dismounting and the service work of back shroud by the angle Support that connects usefulness is set.

Claims

1, a kind of electromagnetic casing screen, comprise biside plate (10), the front beam (11) vertical with described side plate (10), the vertical rear cross beam (6) that is used to install backboard (being the dorsal part printed circuit board) with side plate (10), be positioned at the shielding cover board (12) of casing top and be positioned at the back shroud (9) of casing rear side, it is characterized in that, the upper and lower side of described back shroud has the bending edge (14 that bends inwards, 15), described bending edge (14,15) outer side edges constitutes a baby hem (16 that is used to install shielding material (4) to the bending of box inside two-stage, 17), described bending edge (14,15) two ends also have a downward secondary bending respectively, and with bending edge (14,15) parallel little folded block (13), the outside of described little folded block (13) is provided with shielding material (5).

2, electromagnetic casing screen according to claim 1, it is characterized in that, have a flange (3) in the described rear cross beam (6), the bending edge up and down of described back shroud (9) (14,15) can place described flange (3) below, described shielding material (4) and flange (3) form and closely contact.

3, electromagnetic casing screen according to claim 1 is characterized in that, the inboard of described back shroud (9) also is provided with the L type clubfoot spare (1) that connects by screw, and another side of described L type angle Support is connected with described side plate (10) by screw.

4, electromagnetic casing screen according to claim 3 is characterized in that, described angle Support (1) and described side plate (10) and back shroud (9) adjacent both sides of the edge on be equipped with shielding material (2).

5, electromagnetic casing screen according to claim 1 is characterized in that, described shielding material (4,5) all has elasticity and is outside convex.

6, electromagnetic casing screen according to claim 4 is characterized in that, described shielding material (2) has elasticity and is outside convex.