Assembled electromagnetic shielding box

Abstract

The utility model discloses an assembly type electromagnetic shielding box which comprises a rectangular box body framework formed by splicing metal supporting rods and a metal plate, the periphery of each metal supporting rod is provided with a strip-shaped mounting groove, a plurality of back-mounted spring nuts are arranged in the mounting grooves in the connecting surfaces of the metal supporting rods and the metal plate, and the back-mounted spring nuts are arranged in the mounting grooves in the connecting surfaces of the metal supporting rods and the metal plate. A first through hole for a bolt to penetrate through is formed in the position, corresponding to the screw hole of the back-mounted spring nut on the metal supporting rod, of each metal plate, each first through hole and the back-mounted spring nut arranged corresponding to the first through hole are fastened through the bolt, and a flat washer is further arranged between each bolt and the corresponding first through hole. And a conductive foam type electromagnetic shielding strip with back conductive adhesive is adhered to an intersection gap between two adjacent metal plates. According to the scheme, the installation process of the shielding box can be simplified, assembly, disassembly and maintenance of all structures in the shielding box are facilitated, and meanwhile the interface requirements and the lifting requirements of different types of electric driving structures can be met.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic shielding devices, in particular to an assembled electromagnetic shielding box. Background Art

[0002] When testing the automotive electric drive controller, the electromagnetic interference of the automotive electric drive controller needs to be effectively shielded in the test bench room to prevent interference with the signal transmission of the test bench and the controller LAN bus communication of the electric drive motor, thereby affecting the normal progress of the test.

[0003] The working principle of the electromagnetic shielding box is to use conductive or magnetic metal materials to make a closed box, which limits the electromagnetic capabilities of the products in the closed box to the spatial range of the closed box, so that the electromagnetic radiation generated will not affect the system outside the box.

[0004] Existing electromagnetic shielding boxes, such as the utility model patent with the authorization announcement number CN201429632Y, explain a portable electromagnetic shielding box. The structure of the electromagnetic shielding box mainly builds the frame of the electromagnetic shielding box by welding, and then forms a closed electromagnetic shielding box by riveting or welding the skin made of the inner and outer conductive metal materials. For example, the utility model patent with the authorization announcement number CN209634579U provides a box structure, including a frame, the inner side of the frame is provided with a heat insulation material, the outer side of the frame is provided with a sound insulation material, the outer side of the heat insulation material is provided with an inner skin, and the outer side of the sound insulation material is provided with an outer skin. The box has the advantages of strong operability, solidity and durability, but the box frame must be formed through a complex welding process, and the outer shell skin must also be punched and bent in multiple steps before welding or riveting, which is complex and has high manufacturing costs. The volume of the electric drive controller in the automotive industry is much larger than that of general wireless communication products in the electronic field, and it is difficult to directly select and use from existing products. When the electromagnetic shielding box needs to be repaired, this type of welding or riveting structure is also inconvenient to disassemble and replace. To facilitate disassembly and replacement, the existing solution is to fix the door of the electromagnetic shielding box with hinges, such as the utility model patent with authorization announcement number CN208441676U. There are also some electromagnetic shielding boxes fixed by hinges, which are assisted by support rods for support when opening and closing, and finger springs or beryllium copper springs are installed on the closing surface to ensure the sealing of the box door and the box. The box with this structure is complex and costly. After long-term use, there is a risk of loosening of this structure, resulting in reduced airtightness.

[0005] In addition, the existing electromagnetic shielding boxes are generally used in wireless communication products in the electronic field, such as mobile phone shielding boxes, wireless router test shielding boxes, etc. The internal structure of the shielding box is generally a flat plate, and the device under test is directly placed in the box, or a fixed slot plate is installed in the plane of the box to install and fix the device under test. This kind of internal structure is extremely inconvenient to install the electric drive controller. On the one hand, it is difficult to operate the assembly components in the upper and lower directions of the electric drive controller due to the limitation of the internal space of the box. In addition, it is not possible to easily adjust the height of the electric drive controller to make it more convenient to connect it with the electric drive. At the same time, the electric drive controller in the automotive industry also needs to connect a three-phase line from outside the box as the input of the controller, and then connect the DC bus from the controller to the output from the shielding box. The electric drive controller in the automotive industry often needs to be connected to the cooling system to cool the controller. Therefore, the existing electromagnetic shielding box is difficult to meet the shielding requirements of the electric drive controller in the automotive industry in terms of space and input and output interfaces. Utility Model Content

[0006] Therefore, in order to solve the above problems, the utility model provides an assembled electromagnetic shielding box.

[0007] The utility model is realized by the following technical solutions:

[0008] The utility model discloses an assembled electromagnetic shielding box, comprising a rectangular box frame formed by splicing a plurality of metal support rods, and metal plates arranged on six sides of the box frame, wherein the metal plates comprise a top plate, a bottom plate, a box door, a back plate and two side plates spliced ​​on the outer periphery of the box frame, each metal support rod is provided with a strip-shaped installation groove along its length direction on all sides, and the outer periphery of each metal support rod is connected to the metal plate on two sides, and a plurality of post-installed spring nuts are arranged in the installation grooves on the connecting surfaces of the metal support rod and the metal plate, and the screw holes of the post-installed spring nuts are arranged in the direction of the metal plate, and a first through hole for passing a bolt is arranged at a position of each metal plate corresponding to the screw hole of the post-installed spring nut on the metal support rod, and each first through hole and the post-installed spring nut arranged corresponding thereto are fastened by a bolt, and a flat washer is also arranged between the bolt and the first through hole, and a conductive foam-type electromagnetic shielding strip with back conductive adhesive is pasted at the intersection gap between two adjacent metal plates.

[0009] Preferably, a standard angle code is provided at the connection angle between two adjacent metal support rods, and two vertical surfaces of the standard angle code are respectively connected to the two adjacent metal support rods, and the vertical surfaces and the metal support rods are fixed by T-bolts and nuts.

[0010] Preferably, the bolt head of the T-bolt is fixed in the mounting groove of the metal support rod, and second through holes are provided on the two vertical surfaces of the standard angle code, and the stud of the T-bolt passes through the second through holes provided on the standard angle code and is locked by a nut.

[0011] Preferably, four supporting legs are further provided at the bottom of the box frame, and the four supporting legs are respectively connected to four metal supporting rods vertically arranged around the box frame through standard angle brackets and bolts and nuts.

[0012] Preferably, the back plate, the top plate and the two side plates are all provided with mounting holes.

[0013] Preferably, the back plate and the two side plates each include two rows of symmetrically arranged mounting holes, and the top plate has two symmetrically arranged mounting holes.

[0014] Preferably, both the inner surface and the outer surface of the mounting hole are covered with an aluminum foil layer with a back conductive adhesive.

[0015] Preferably, a hand-operated lifting mechanism is provided on the bottom plate, a metal mesh plate is liftably provided on the hand-operated lifting mechanism, and an insulating plastic mesh plate is fixedly provided on the metal mesh plate.

[0016] Preferably, the hand-cranked lifting mechanism includes a lead screw vertically inserted through the base plate, a worm gear is connected to the outer periphery of the lead screw, the worm gear is fixed to the base plate through an adapter plate, and is driven to rotate by a handwheel to drive the lead screw to move up and down.

[0017] Preferably, a screw flange is provided on the top of the screw, and the metal mesh plate is fixed to the screw flange by bolts.

[0018] The beneficial effects of the technical solution of the utility model are mainly reflected in:

[0019] 1. The box frame of the assembled electromagnetic shielding box is made of multiple metal support rods, which are connected by standard angle codes without the need for complex welding processes. At the same time, the metal support rods and the metal plates on the outside of the box frame are fixed by post-installed spring nuts in the mounting grooves on the surfaces of the metal support rods and bolts that pass through the metal plates and the metal support rods, and are further locked by gaskets. On the one hand, the above assembly method can simplify the installation process of the shielding box, and the metal support rods and the external skin do not need to be processed by complex welding, riveting, punching and bending processes; on the other hand, the simple assembly structure facilitates the assembly, disassembly and maintenance of various structures in the shielding box.

[0020] 2. The back plate, top plate and two side plates are all provided with mounting holes. The arrangement of the mounting holes can well meet the interface requirements of different types of electric drive structures, thereby adapting to the needs of the power line, ground line input and output, and cooling system interface of the electric drive controller in the automotive industry.

[0021] 3. A conductive foam-type electromagnetic shielding strip with a back conductive adhesive is pasted at the intersection gap between two adjacent metal plates, which can greatly improve the sealing performance of the assembled electromagnetic shielding box. At the same time, the inner and outer surfaces of the mounting hole are covered with an aluminum foil layer with a back conductive adhesive, which can meet the interface requirements of the electric drive controller in the automotive industry while ensuring the sealing performance of the mounting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the box frame of the assembled electromagnetic shielding box;

[0023] Figure 2 This is a schematic diagram of the structure of an assembled electromagnetic shielding box (the box door is omitted at this time);

[0024] Figure 3 It is a three-dimensional diagram of an assembled electromagnetic shielding box;

[0025] Figure 4 It is a schematic diagram of the installation status of the metal support rod and the metal plate;

[0026] Figure 5 This is a schematic diagram of the assembly of standard angle brackets, T-screws and nuts. DETAILED DESCRIPTION

[0027] In order to make the purpose, advantages and features of the utility model more clearly and in detail, the following preferred embodiments are illustrated and explained through non-limiting descriptions. This embodiment is only a typical example of the application of the technical solution of the utility model. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the utility model.

[0028] At the same time, it is stated that in the description of the scheme, it should be noted that the directions or positional relationships indicated by the terms "center", "up", "down", "left", "right", "front", "back", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0029] In addition, the terms "first" and "second" in this solution are only used for descriptive purposes and cannot be understood as indicating or implying the order of importance, or implicitly indicating the number of technical features shown. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In this utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] The utility model discloses an assembled electromagnetic shielding box, such as Figure 1-Figure 3As shown, the box frame 1 comprises a rectangular box frame 1 formed by splicing a plurality of metal rods 2. In one embodiment, as shown in FIG. Figure 2 As shown, the metal support rods 2 used for splicing the box frame 1 include at least 12 metal support rods 2 for building the outline of the box frame 1, wherein a plurality of support rods 9 for improving the supporting performance of the bottom plate 5 can be added at the position where the bottom plate 5 is installed, and four support legs 3 with the same structure as the metal support rods 2 are added at the bottom of the box to raise the height of the box, thereby providing space for the subsequent installation of a lead screw 13 at the bottom of the box. The assembled electromagnetic shielding box also includes metal plates arranged on six sides of the box frame 1, and the metal plates include a top plate 4, a bottom plate 5, a box door 6, a back plate 7 and two side plates 8 spliced ​​to the outer periphery of the box frame 1. In some embodiments, the box door 6 is also provided with a handle for opening the box door.

[0031] Among them, Figure 1 , Figure 4 As shown, each metal support rod 2 is square tube-shaped as a whole, and strip-shaped mounting grooves 19 are arranged around the metal support rod 2 along its length direction, and the mounting grooves 19 on each plane around the metal support rod 2 are open on the plane where they are located. Since there are 12 metal support rods 2 for building the outline of the box frame 1, and the six sides of the box frame 1 are spliced ​​with metal plates, the outer periphery of each metal support rod 2 has two sides connected to the metal plates, and a plurality of post-installed spring nuts 20 are arranged in the mounting grooves 19 on the connecting surfaces of the metal support rod 2 and the metal plates, and the screw holes of the post-installed spring nuts 20 are arranged in the direction of the metal plates. In one embodiment, the screw holes along the post-installed spring nuts 20 are arranged opposite to the opening of the mounting grooves 19, and the post-installed spring nuts 20 are fixed in abutment with the inner walls of the mounting grooves 19 of the metal support rod 2, wherein the specific structure of the post-installed spring nuts 20 is prior art, and reference may be made to, for example, the authorized The utility model patent with announcement number CN209025980U may also adopt other post-installed spring nut 20 structures, which will not be described in detail here. A first through hole 24 for passing the bolt 22 is provided at a position corresponding to the screw hole of the post-installed spring nut 20 on each metal plate and the metal support rod 2. The bolt 22 passes through the first through hole 24 and the corresponding screw hole of the post-installed spring nut 20 at the same time, so that each first through hole 24 and the post-installed spring nut 20 corresponding thereto are fastened by the bolt 22, thereby tightly fixing the metal plate on the metal support rod 2. A flat washer 21 is also provided between the bolt 22 and the first through hole 24. The flat washer 21 is used to adjust the tightness and firmness of the assembly between the bolt 22 and the first through hole 24. The bolt 22 structure is used to fasten the box door, and there will be no looseness after long-term use. The electromagnetic airtightness is more reliable and convenient for subsequent disassembly and maintenance.

[0032] A conductive foam type electromagnetic shielding strip 25 with back conductive adhesive is pasted at the intersection gap between two adjacent metal plates. Specifically, the conductive foam type electromagnetic shielding strip 25 is sealed and covers the entire gap. Relying on the back conductive adhesive of the conductive foam itself and the flexibility of the foam, the gap between the two metal plates can be well sealed, so that the box has complete electromagnetic airtightness.

[0033] like Figure 1 , Figure 5 As shown, in some embodiments, a standard angle code 17 is provided at the connection angle of two adjacent metal support rods 2, and the standard angle code 17 includes two rectangular vertical surfaces 1701 and two slope surfaces 1702 for supporting the two vertical surfaces 1701. The two vertical surfaces 1701 of the standard angle code 17 are respectively connected to the two adjacent metal support rods 2. Since the box frame 1 is a rectangular box frame 1, the two adjacent metal support rods 2 are perpendicular to each other. Therefore, the two vertical surfaces 1701 of the standard angle code 17 can be respectively attached to the surfaces of the two adjacent metal support rods 2, and the vertical surfaces 1701 and the metal support rods 2 are fixed by T-bolts 18 and nuts 23. In one embodiment, the bolt head of the T-bolt 18 is fixed in the mounting groove 19 of the metal support rod 2, and a second through hole is provided on the two vertical surfaces 1701 of the standard angle code 17. The stud of the T-bolt 18 passes through the second through hole provided on the standard angle code 17 and is locked by the nut 2318.

[0034] In some embodiments, the four supporting legs 3 at the bottom of the box frame 1 are respectively connected to the four metal support rods 2 vertically arranged around the box frame 1 through standard angle codes 17, T-bolts 18, and nuts 23. The structure of the supporting legs 3 is the same as that of the metal support rods 2, and the fixing method of the supporting legs 3 and the metal support rods 2 is consistent with the fixing method between the above-mentioned two adjacent metal support rods 2, which will not be repeated here.

[0035] The back plate 7, the top plate 4 and the two side plates 8 are all provided with mounting holes 10. In some embodiments, the back plate 7 and the two side plates 8 include two symmetrically arranged rows of mounting holes 10, and the top plate 4 is symmetrically provided with two mounting holes 10. In a preferred embodiment, the inner and outer surfaces of the mounting holes 10 are covered with an aluminum foil layer with a back conductive adhesive (not shown in the figure). The hole arrangement of the mounting holes 10 can well meet the interface requirements of different types of electric drive structures. After the installation is completed, the holes on the wall of the shielding box are sealed with aluminum foil, and the box can be used normally. This type of method is simple and fast, and can be quickly adjusted according to actual needs.

[0036] like Figure 2As shown, in some embodiments, a hand-cranked lifting mechanism is provided on the base plate 5, and a metal mesh plate 11 is liftably provided on the hand-cranked lifting mechanism, and an insulating plastic mesh plate 12 is fixedly provided on the metal mesh plate 11. The electric drive controller to be tested is directly fixed on the metal mesh plate 11 via the insulating plastic mesh plate 12. In this structure, the metal mesh plate 11 can ensure that the installation platform has sufficient bearing capacity, and the insulating plastic mesh plate 12 ensures the electrical insulation between the electric drive controller and the box.

[0037] In some embodiments, the hand-cranked lifting mechanism includes a lead screw 13 vertically penetrated on the base plate 5, and a worm gear 14 is connected to the outer periphery of the lead screw 13. The worm gear is fixed to the base plate 5 through an adapter plate, and is driven to rotate by a handwheel 15 to drive the lead screw 13 to move up and down. The connection structure of the worm gear 14 and the lead screw 13 can refer to the prior art, such as the utility model patent with authorization announcement number CN219384617U, etc., which will not be repeated here. A lead screw flange 16 is provided on the top of the lead screw 13, and the metal mesh plate 11 is fixed on the lead screw flange 16 by bolts 22. The worm gear is rotated by the handwheel 15 to drive the lead screw 13 to move up and down, and drives the lead screw flange 16 provided on the top of the lead screw 13 and the metal mesh plate 11 and the insulating plastic mesh plate 12 on the lead screw flange 16 to move up and down together, thereby ensuring that the height of the electric drive controller in the electromagnetic shielding box is adjusted during the test.

[0038] There are many implementation methods of the utility model, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the utility model.

Claims

1. An assembled electromagnetic shielding box, comprising a rectangular box frame formed by splicing a plurality of metal rods, and metal plates arranged on six sides of the box frame, wherein the metal plates include a top plate, a bottom plate, a box door, a back plate and two side plates spliced ​​on the periphery of the box frame, characterized in that: Each metal support rod is provided with strip-shaped installation grooves along its length direction. The outer periphery of each metal support rod has two sides connected to the metal plate. A plurality of post-installed spring nuts are arranged in the installation grooves on the connecting surfaces of the metal support rod and the metal plate. The screw holes of the post-installed spring nuts are arranged in the direction of the metal plate, and a first through hole for passing a bolt is arranged at a position of each metal plate corresponding to the screw hole of the post-installed spring nut on the metal support rod. Each first through hole and the post-installed spring nut corresponding thereto are fastened by a bolt. A flat washer is also arranged between the bolt and the first through hole. A conductive foam-type electromagnetic shielding strip with back conductive adhesive is pasted at the intersection gap between two adjacent metal plates.

2. The assembled electromagnetic shielding box according to claim 1, characterized in that: A standard angle code is provided at the connection angle between two adjacent metal support rods. Two vertical surfaces of the standard angle code are respectively connected to the two adjacent metal support rods, and the vertical surfaces and the metal support rods are fixed by T-bolts and nuts.

3. The assembled electromagnetic shielding box according to claim 2, characterized in that: The bolt head of the T-bolt is fixed in the mounting groove of the metal support rod, and second through holes are arranged on two vertical surfaces of the standard angle code. The stud of the T-bolt passes through the second through holes arranged on the standard angle code and is locked by a nut.

4. The assembled electromagnetic shielding box according to claim 2, characterized in that: The bottom of the box frame is also provided with four supporting legs, which are respectively connected with four metal supporting rods vertically arranged around the box frame through standard angle codes and bolts and nuts.

5. The assembled electromagnetic shielding box according to claim 1, characterized in that: The back plate, the top plate and the two side plates are all provided with mounting holes.

6. The assembled electromagnetic shielding box according to claim 5, characterized in that: The back plate and the two side plates each include two rows of symmetrically arranged mounting holes, and the top plate includes two symmetrically arranged mounting holes.

7. The assembled electromagnetic shielding box according to claim 5, characterized in that: The inner surface and the outer surface of the mounting hole are both covered with an aluminum foil layer with a back conductive adhesive.

8. The assembled electromagnetic shielding box according to claim 1, characterized in that: The bottom plate is provided with a hand-cranked lifting mechanism, a metal mesh plate is liftably provided on the hand-cranked lifting mechanism, and an insulating plastic mesh plate is fixedly provided on the metal mesh plate.

9. The assembled electromagnetic shielding box according to claim 8, characterized in that: The hand-cranked lifting mechanism includes a lead screw vertically inserted through the base plate, a worm gear is connected to the outer periphery of the lead screw, the worm gear is fixed to the base plate through an adapter plate, and the lead screw is driven to move up and down by the hand wheel.

10. The assembled electromagnetic shielding box according to claim 9, characterized in that: A screw flange is arranged on the top of the screw, and the metal mesh plate is fixed on the screw flange by bolts.

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