Electromagnetic interference protection device

Abstract

The application discloses an electromagnetic interference shielding device, which comprises an openable metal mesh cover and at least two openable supporting frames; the metal mesh cover is connected between the two supporting frames to form an electromagnetic shielding space extending along the length direction of the metal mesh cover. When the electromagnetic interference shielding device is used, the metal mesh cover and the supporting frames are only needed to be opened, and the metal mesh cover is installed at any position in the extension direction of the bridge, so that an electromagnetic shielding space is formed around the bridge; the electromagnetic interference shielding device is convenient to disassemble and assemble and has good adaptability, and can solve the electromagnetic interference shielding problem of the blind area of the existing bridge and has no influence on the existing bridge and the original connecting structure of the bridge, and has simple and reliable structure and good popularization and application prospect.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic shielding technology, and in particular to an electromagnetic interference protection device. Background Technology

[0002] In complex industrial facilities, especially in various power plants, different types of cables are laid in compact cable trays and arranged according to prescribed physical spatial structures. For both high-voltage equipment such as power cables and low-voltage equipment such as instrumentation and control cables, abnormal voltage or current signals may arise during operation due to the equipment itself or the system. This generates electromagnetic induction, which can interfere with nearby low-voltage cables and potentially lead to serious consequences.

[0003] To reduce the impact of electromagnetic interference (EMI), cable trays used for laying instrumentation and control cables are generally fully enclosed metal trunking. However, due to certain constraints during on-site construction, it is difficult to achieve complete enclosure of low-voltage cable trays. There are still some EMI blind spots where the metal trunking alone cannot solve the EMI protection problem. These include locations where cables exit the tray, locations where cables are bridging between different trays, and locations with very small spacing between trays in confined spaces. EMI protection is ineffective in these blind spots. In existing technologies, these EMI blind spots are typically covered with on-site fabricated sheet metal or other electromagnetic shielding components to create electromagnetic shielding. This method is limited by installation space, leading to difficulties in disassembly and assembly, and is not secure. Furthermore, it also affects troubleshooting and cable maintenance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an electromagnetic interference protection device that addresses at least one deficiency of the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problem is: to provide an electromagnetic interference protection device, which includes an openable and closable metal mesh sleeve and at least two openable and closable support frames; the metal mesh sleeve is connected between the two support frames to form an electromagnetic shielding space extending along the length direction of the metal mesh sleeve.

[0006] Preferably, the support frame includes at least three telescopic rods, which are connected in sequence to form a closed loop;

[0007] The metal mesh sleeve is wavy in its circumferential direction, and its circumferential dimension increases as the telescopic rod extends and decreases as the telescopic rod shortens.

[0008] Preferably, the telescopic rod includes at least two axially joined straight rods, and adjacent straight rods are slidable relative to each other along the axial direction.

[0009] Preferably, the number of telescopic rods is four, and the four telescopic rods are connected in sequence to form a rectangular closed loop.

[0010] Preferably, the first and last telescopic rods connected in sequence are detachable.

[0011] In the open state, the first telescopic rod separates from the last telescopic rod, and the metal mesh sleeve opens from its circumferential closed-loop connection. Both the support frame and the metal mesh sleeve are in an open-loop shape.

[0012] In the closed state, the first telescopic rod is connected to the last telescopic rod, and the metal mesh sleeve closes from its circumferential closed-loop connection point. Both the support frame and the metal mesh sleeve are in a closed-loop shape.

[0013] Preferably, the electromagnetic interference protection device further includes fasteners;

[0014] The fasteners are installed between the first and last telescopic rods, and at intervals along the length of the metal mesh sleeve at the closed-loop connections in the circumferential direction of the metal mesh sleeve.

[0015] Preferably, the support frame includes two portal telescopic rods, which are connected together along a first docking direction to form a rectangular closed loop, and the two portal telescopic rods are movable relative to each other in the first docking direction;

[0016] Each of the portal telescopic rods includes two L-shaped rods connected along a second docking direction perpendicular to the first docking direction, and the two L-shaped rods are movable relative to each other in the second docking direction;

[0017] The metal mesh sleeve is wavy in its circumferential direction, and its circumferential dimension increases as the portal telescopic rod extends and decreases as the portal telescopic rod shortens.

[0018] Preferably, the two portal-shaped telescopic rods are a first portal-shaped telescopic rod and a second portal-shaped telescopic rod, respectively;

[0019] One of the L-shaped rods of the first portal telescopic rod includes a first end connected to the other L-shaped rod of the first portal telescopic rod and a second end connected to the second portal telescopic rod, and the first end and the second end are hinged together.

[0020] In the open state, the other L-shaped rod of the first portal telescopic rod separates from the second portal telescopic rod, and the metal mesh sleeve opens from its circumferential closed-loop connection. Both the support frame and the metal mesh sleeve are in an open-loop shape.

[0021] In the closed state, the other L-shaped rod of the first portal telescopic rod is connected to the second portal telescopic rod, and the metal mesh sleeve closes from its circumferential closed-loop connection point. Both the support frame and the metal mesh sleeve are in a closed-loop shape.

[0022] Preferably, the electromagnetic interference protection device further includes fasteners;

[0023] The fasteners are disposed between the two portal telescopic rods and at intervals along the length of the metal mesh sleeve at the closed-loop connection points on the circumference of the metal mesh sleeve.

[0024] Preferably, the metal mesh sleeve is wavy in its length direction and can extend and retract back and forth between the support frames along its length direction.

[0025] Preferably, the metal mesh sleeve includes adjacent protrusions and recesses in its length direction to form the wavy shape;

[0026] The support frame is connected to the two opposite ends along the length of the metal mesh sleeve, as well as to the protrusions and recesses of the metal mesh sleeve.

[0027] Preferably, the electromagnetic interference protection device further includes a grounding clamp disposed on the metal mesh sleeve, the metal mesh sleeve being connected to the grounding wire on the cable tray through the grounding clamp.

[0028] Preferably, the outer surface of the metal mesh sleeve and the support frame is provided with a rust-proof and waterproof coating.

[0029] This invention has at least the following beneficial effects: When using the electromagnetic interference protection device, the metal mesh sleeve and support frame are opened, and the metal mesh sleeve is installed at any position in the extension direction of the cable tray, thus constructing an electromagnetic shielding space around the cable tray. It can be disassembled during fault diagnosis, cable maintenance, and other work, making disassembly and assembly convenient and adaptable. It solves the electromagnetic interference protection problem in the electromagnetic interference protection blind spots of existing cable trays without affecting the existing cable trays and their original connection structures. The structure is simple and reliable, and has good prospects for widespread application. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0031] Figure 1 This is a simplified structural diagram of the electromagnetic interference protection device in the length direction according to the first embodiment of the present invention;

[0032] Figure 2 yes Figure 1 Top view;

[0033] Figure 3 yes Figure 1 Side view;

[0034] Figure 4 The electromagnetic interference protection device of the first embodiment of the present invention is in Figure 3 A schematic diagram of the structure when it is in the open state, viewed from the perspective of [viewer's perspective].

[0035] Figure 5 This is a simplified structural diagram of the electromagnetic interference protection device in the length direction according to the second embodiment of the present invention;

[0036] Figure 6 yes Figure 5 Top view;

[0037] Figure 7 yes Figure 5 Side view;

[0038] Figure 8 The electromagnetic interference protection device of the second embodiment of the present invention is in Figure 7 A schematic diagram of structural decomposition from a specific perspective;

[0039] Figure 9 The electromagnetic interference protection device of the second embodiment of the present invention is in Figure 7 A schematic diagram of the structure when it is in the open state, viewed from the perspective of [viewer's perspective].

[0040] Figure 10 This is a simplified structural diagram of the electromagnetic interference protection device in the length direction according to the third embodiment of the present invention;

[0041] Figure 11 This is a simplified structural diagram of the electromagnetic interference protection device of the third embodiment of the present invention installed on a cable tray in the length direction;

[0042] Figure 12 yes Figure 11 Top view. Detailed Implementation

[0043] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0044] The terms used above are for ease of description only and should not be construed as limitations on this technical solution.

[0045] As described in the background section, existing cable trays inevitably have electromagnetic interference (EMI) protection blind spots that cannot be covered by the metal trays. Examples include: the exposed portion of a cable when it bridging two or more parallel adjacent cable trays; the end of the cable tray where the cable conductor extends beyond the tray; and adjacent cable trays with insufficient spacing. Correspondingly, this invention provides an EMI protection device that can at least cover these EMI protection blind spots, thus solving the EMI protection problem of EMI protection blind spots on low-voltage cable trays. Furthermore, the EMI protection device of this invention can also be installed on cable trays in locations outside the aforementioned blind spots, further providing EMI protection for the cable trays.

[0046] like Figure 1-4 As shown, the electromagnetic interference protection device of the first embodiment of the present invention includes an openable and closable annular metal mesh sleeve 1 and two openable and closable annular support frames 2.

[0047] Specifically, the spread-out metal mesh can be rolled up and joined end to end to form a ring-shaped metal mesh sleeve 1. The metal mesh sleeve 1 is connected between two supporting frames 2 at its opposite ends along its length, thereby forming an electromagnetic shielding space extending along the length of the metal mesh sleeve 1 inside the metal mesh sleeve 1.

[0048] In use, the support frame 2 and the metal mesh sleeve 1 can be opened together and placed around two or more adjacent cable trays, covering the cables bridging two or more parallel adjacent cable trays. Alternatively, it can be placed around one of the adjacent cable trays to solve the problem of poor electromagnetic interference protection due to insufficient spacing between adjacent cable trays. Furthermore, the metal mesh sleeve 1 can be placed at the end of the cable tray to cover the ends of the cable conductors extending from inside the cable tray. This effectively solves the electromagnetic interference protection problem in the existing electromagnetic interference protection blind spots of cable trays.

[0049] Compared to the sheet metal used in existing technologies, the metal mesh sleeve 1 has reliable magnetic permeability, and its mesh structure saves material. The metal mesh sleeve 1 possesses reliable structural strength and good magnetic permeability. By opening the metal mesh sleeve and support frame, it can be installed at any position along the cable tray's extension direction, creating an electromagnetic shielding space around the cable tray. It is easy to assemble and disassemble, and highly adaptable, allowing for easy installation and removal according to actual site requirements without affecting the existing cable tray and connecting structures. Even with small spacing between adjacent cable trays, it can achieve electromagnetic interference protection. Depending on different budgets and electromagnetic shielding requirements, metal materials with varying magnetic permeability can be selected to manufacture the metal mesh sleeve 1.

[0050] The support frame 2 includes four telescopic rods 20, which are connected sequentially until the first and last telescopic rods 20 connect to form a closed loop. Correspondingly, the metal mesh sleeve 1 is wavy in its circumferential direction, allowing for a certain amount of tensile deformation in its circumferential dimension. The circumferential dimension of the metal mesh sleeve 1 can increase as the telescopic rods 20 extend and decrease as they shorten. Therefore, by stretching the telescopic rods 20, the circumferential dimension of the metal mesh sleeve 1 can be flexibly changed to adapt to different cable tray sizes and the spacing between adjacent cable trays, thus flexibly adapting to different application scenarios.

[0051] Furthermore, by stretching the support frames 2 at both ends of the metal mesh sleeve 1, the circumferential dimensions of the two support frames 2 can be selectively adjusted to be the same or different. Since the metal mesh sleeve 1 is connected between the two support frames 2, if the circumferential dimensions of the two support frames 2 are stretched to different sizes, the circumferential dimension of the metal mesh sleeve 1 will gradually increase or decrease along its length. This provides the metal mesh sleeve 1 with good flexibility in size adjustment, allowing it to adapt to various complex site environments and facilitating real-time adjustments during installation.

[0052] If the closed loop formed by connecting multiple telescopic rods 20 in sequence is rectangular, the circumferential dimension can be interpreted as the side length of the rectangle; if the closed loop formed by connecting multiple telescopic rods 20 in sequence is circular, the circumferential dimension can be interpreted as the diameter of the ring. Alternatively, the circumferential dimension can also be interpreted as the cross-sectional area of ​​the metal mesh sleeve 1.

[0053] In other embodiments, the number of telescopic rods 20 may be three, five, six, etc.

[0054] Furthermore, when there are four telescopic rods 20, the four telescopic rods 20 are connected in sequence to form a rectangular closed loop to adapt to the shape of the metal trough of the cable tray.

[0055] Furthermore, such as Figure 3 As shown, in the case of four telescopic rods 20, each telescopic rod 20 includes two interlocking straight rods 201 with unequal diameters, and adjacent straight rods 201 can slide relative to each other. That is, the telescopic rods 20 extend and retract in the form of telescopic sleeves.

[0056] Alternatively, there may be two or more straight rods 201, with the diameter of each straight rod 201 increasing or decreasing sequentially, and adjacent straight rods 201 sliding relative to each other to achieve the reciprocating extension and retraction of the telescopic rod 20.

[0057] Furthermore, the first telescopic rod 20 and the last telescopic rod 20, which are connected in sequence, are detachably connected, so that the first telescopic rod 20 and the last telescopic rod 20 can be separated, thereby opening the support frame 2. For example... Figure 3-4As shown, adjacent straight rods 201 can be hinged, and adjacent straight rods 201 can rotate relative to each other to facilitate opening the support frame 2.

[0058] Specifically, a connecting hole (not shown in the figure) can be made on the circumference of the first telescopic rod 20 for the insertion of the last telescopic rod 20. After the last telescopic rod 20 is inserted into the connecting hole on the first telescopic rod 20 and fixed, the support frame 2 is in a closed loop shape (e.g., Figure 3 (As shown); when the last telescopic rod 20 is pulled out from the connecting hole on the first telescopic rod 20, the support frame 2 will be in an open-loop shape (as shown). Figure 4 (As shown).

[0059] By rotating the first telescopic rod 20 and the last telescopic rod 20 in relatively opposite directions, the support frame 2 can be opened. Figure 4 As shown, in the open state, the first telescopic rod 20 and the last telescopic rod 20 are separated, and the metal mesh sleeve 1 opens from its circumferential closed-loop connection, with both the support frame 2 and the metal mesh sleeve 1 in an open-loop form.

[0060] The support frame 2 can be closed by rotating the first and last telescopic rods 20 in a relatively close direction. Figure 3 As shown, in the closed state, the first telescopic rod 20 is connected to the last telescopic rod 20, and the metal mesh sleeve 1 is closed from its circumferential closed loop connection. Both the support frame 2 and the metal mesh sleeve 1 are in a closed loop shape.

[0061] With the support frame 2 and metal mesh sleeve 1 in the open state, they can be placed around the cable tray that needs protection for positioning. After positioning, the support frame 2 and metal mesh sleeve 1 can be closed to complete the installation.

[0062] Further, please refer to Figure 3-4 In this embodiment, the electromagnetic interference protection device further includes fasteners 3. Fasteners 3 are detachably disposed between the first telescopic rod 20 and the last telescopic rod 20, and are spaced apart along the length of the metal mesh sleeve 1 at the closed-loop connection points in the circumferential direction of the metal mesh sleeve 1.

[0063] Specifically, the fastener 3 can be in the form of a snap-fit ​​or a binding rope. In the closed state, it secures the closed-loop connection of the metal mesh sleeve 1. In the open state, the fastener 3 can be removed or disassembled, allowing the metal mesh sleeve 1 to be opened from its closed-loop connection. For example, when the fastener 3 is a snap-fit, it can be engaged or disengaged at the closed-loop connection of the metal mesh sleeve 1. The snap-fit ​​can be formed by the mating of two interlocking parts, or it can be an openable and closable ring. In this embodiment, the spacing between the fasteners 3 along the length of the metal mesh sleeve 1 is set to 15cm.

[0064] In this embodiment, the metal mesh sleeve 1 is wavy in its length direction and can extend and retract back and forth between the support frames 2 along its length direction to achieve dimensional adjustment of the metal mesh sleeve 1 in the length direction. Because the length of the metal mesh sleeve 1 is adjustable, it can better adapt to the corner positions of the cable tray. By stretching the metal mesh sleeve 1 in the length direction, the complete coverage of the corner positions of the cable tray can be ensured.

[0065] In this embodiment, the electromagnetic interference protection device also includes a grounding clamp disposed on the metal mesh sleeve 1, which is connected between the metal mesh sleeve 1 and the grounding wire on the cable tray to ground the metal mesh sleeve 1.

[0066] Considering the possibility of water vapor or other volatile chemicals on site, the outer surfaces of the metal mesh sleeve 1 and the support frame 2 are coated with anti-rust and waterproof coatings to avoid the adverse effects of water vapor or other volatile chemicals on them.

[0067] like Figure 5-9 As shown, the electromagnetic interference protection device of the second embodiment of the present invention includes an openable and closable annular metal mesh sleeve 4 and two openable and closable annular support frames 5.

[0068] In this embodiment, unlike the first embodiment described above, the support frame 5 includes two portal-shaped telescopic rods 50, which are joined together along the first docking direction D1 to form a rectangular closed loop. The two portal-shaped telescopic rods 50 can move relative to each other in the first docking direction D1 after docking.

[0069] Each portal telescopic rod 50 includes two L-shaped rods 501 connected along a second docking direction D2, and the two L-shaped rods 501 are movable relative to each other in the second docking direction D2. The first docking direction D1 and the second docking direction D2 are perpendicular to each other.

[0070] Among them, the portal-shaped telescopic rod 50 can be a telescopic sleeve. That is, the two L-shaped rods 501 have different diameters and are interlocked with each other, and can slide against each other along the second docking direction D2. The two portal-shaped telescopic rods 50 are interlocked with each other and can slide against each other along the first docking direction D1, so that the support frame 5 can extend and retract back and forth in the first docking direction D1 and the second docking direction D2 to adjust its overall circumferential dimensions.

[0071] Correspondingly, the metal mesh sleeve 4 is wavy in its circumferential direction, and its circumferential dimension increases as the portal telescopic rod 50 extends in the first docking direction D1 or the second docking direction D2, and decreases as the portal telescopic rod 50 shortens in the first docking direction D1 or the second docking direction D2. Therefore, by stretching the telescopic rod 50, the circumferential dimension of the metal mesh sleeve 4 can be flexibly changed to adapt to different cable tray sizes and the spacing between adjacent cable trays, thus flexibly adapting to different application scenarios.

[0072] Furthermore, the two portal-shaped telescopic poles 50 are designated as the first portal-shaped telescopic pole and the second portal-shaped telescopic pole, respectively. The terms "first" and "second" are used only to distinguish between the two portal-shaped telescopic poles 50. Please refer to [reference needed]. Figure 7-9 In the example, the upper portal-shaped telescopic rod 50 is used as the first portal-shaped telescopic rod, and the lower portal-shaped telescopic rod 50 is used as the second portal-shaped telescopic rod:

[0073] One of the L-shaped rods 501 of the first portal telescopic rod includes a first end a connected to the other L-shaped rod 501 of the first portal telescopic rod and a second end b connected to the second portal telescopic rod, and the first end a and the second end b are hinged to form a hinge point h. The first end a can rotate relative to the second end b about the hinge point h.

[0074] One end a of one of the L-shaped rods 501 of the first portal telescopic rod rotates about the hinge point h in a direction away from the second portal telescopic rod. This rotation causes the other L-shaped rod 501 of the first portal telescopic rod to rotate, allowing the support frame 5 to open. (See also...) Figure 9 Therefore, in the open state, the second end b of one of the L-shaped rods 501 of the first portal telescopic rod is connected to one of the L-shaped rods 501 of the second portal telescopic rod, and its first end a, together with the other L-shaped rod 501 of the first portal telescopic rod, is separated from the second portal telescopic rod.

[0075] Correspondingly, the metal mesh sleeve 4 opens from its circumferential closed-loop connection, and both the support frame 5 and the metal mesh sleeve 4 are in an open-loop form.

[0076] One end a of one of the L-shaped rods 501 of the first portal telescopic rod rotates about the hinge point h in a direction close to the second portal telescopic rod, causing the other L-shaped rod 501 of the first portal telescopic rod to rotate and connect with the second portal telescopic rod. (See also...) Figure 7 Therefore, in the closed state, the second end b of one of the L-shaped rods 501 of the first portal telescopic rod is connected to one of the L-shaped rods 501 of the second portal telescopic rod; its first end a, together with the other L-shaped rod 501 of the first portal telescopic rod, is connected to the second portal telescopic rod to form a rectangular closed loop.

[0077] Correspondingly, the metal mesh sleeve 4 closes from its circumferential closed-loop connection, and both the support frame 5 and the metal mesh sleeve 4 are in a closed-loop shape.

[0078] In summary, with the support frame 2 and metal mesh sleeve 4 in the open state, they can be placed around the cable tray that needs protection for positioning. After positioning, the support frame 2 and metal mesh sleeve 4 can be closed to complete the installation.

[0079] Alternatively, the two telescopic rods 50 can be separated in the first docking direction D1, and the support frame 5 can be opened and fitted onto the outer perimeter of the cable tray. Correspondingly, a convex-concave fitting positioning structure can be provided on the inner wall of the two L-shaped rods 501 to achieve fixation after the two L-shaped rods 501 are connected.

[0080] Furthermore, in this embodiment, the electromagnetic interference protection device also includes fasteners 6. Fasteners 6 are detachably disposed between the two portal telescopic rods 50 and at intervals along the length of the metal mesh sleeve 4 at the closed-loop connection points on the circumference of the metal mesh sleeve 4, so as to connect and reinforce the two portal telescopic rods 50 after docking, and the two portal telescopic rods 50 can be separated by removing fasteners 6, and the support frame 5 can be opened.

[0081] like Figure 10 As shown, the electromagnetic interference protection device of the third embodiment of the present invention includes an openable and closable annular metal mesh sleeve 7 and three or more openable and closable annular support frames 8.

[0082] The metal mesh sleeve 1 includes adjacent protrusions 70 and recesses 71 along its length, with recesses 71 formed between adjacent protrusions 70 and protrusions 70 between adjacent recesses 71 to form a wave shape. Three or more support frames 8 are respectively connected to opposite ends along the length of the metal mesh sleeve 7 and to each of the protrusions 70 and recesses 71 of the metal mesh sleeve 7.

[0083] Increasing the number of support frames 8 improves the overall structural strength of the electromagnetic interference protection device. Furthermore, the circumferential dimensions of each support frame 8 can be inconsistent. The more support frames 8 there are, the more flexible the size adjustment of the metal mesh sleeve 7 becomes. The circumferential dimensions of the metal mesh sleeve 7 at different positions along its length can be adjusted by extending and retracting the support frames 8, adapting to various complex installation environments.

[0084] In the second embodiment of the present invention, other unmentioned content may be set with reference to the first or third embodiment. In the third embodiment of the present invention, other unmentioned content may be set with reference to the first or second embodiment.

[0085] like Figure 10-12 As shown, taking the corner position of two adjacent low-voltage cable trays as an example, the installation steps of the electromagnetic interference protection device of the third embodiment of the present invention are as follows:

[0086] 1. Conduct a site survey of the installation environment before installation.

[0087] First, measure the circumferential and longitudinal protection requirements of two adjacent cable trays 9, as well as the distance between the two cable trays 9. In addition, determine the condition of both ends of the cable trays 9, especially confirming whether cables are led out from the ends of the cable trays 9. Then, determine the location and distance of the grounding wire near the corner of the target cable tray 9.

[0088] 2. Based on the cross-sectional dimensions of the two cable trays 9 and the distance e between the two cable trays 9, the circumferential dimensions of the support frame 8 and the metal mesh sleeve 7 are pre-adjusted.

[0089] The tension support frame 8 is used to adjust the circumferential dimensions of the metal mesh sleeve 7, so that the cross-sectional height of the metal mesh sleeve 7 is about 0.5cm larger than the cross-sectional height of the cable tray 9, and its cross-sectional width is about 0.5cm larger than the sum of the cross-sectional widths and the spacing e of the two cable trays 9, in order to avoid large dimensional errors that could cause difficulties in the installation process or deformation of the metal mesh sleeve 7.

[0090] 3. Adjust the length of the metal mesh sleeve 7 according to the protection dimensions required along the length of the cable tray 9. If the length of one electromagnetic interference protection device is insufficient, another electromagnetic interference protection device can be added to ensure that the corner position of the cable tray 9 is within the electromagnetic shielding space. If the end of the cable tray 9 is the end of the cable conductor, and the cable extends out of the end of the cable tray 9, the installation position of the electromagnetic protection device can be adjusted appropriately to ensure that the metal mesh sleeve 7 can cover the cable extending out of the end of the cable tray 9.

[0091] The above are merely some specific embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An electromagnetic interference protection device, characterized in that, For installation on the periphery of at least one cable tray, the electromagnetic interference protection device includes an openable and closable metal mesh sleeve and at least two openable and closable support frames; the metal mesh sleeve is connected between the two support frames to form an electromagnetic shielding space extending along the length of the metal mesh sleeve. The support frame includes four telescopic rods, which are connected in sequence to form a rectangular closed loop. The first and last telescopic poles connected in sequence are detachable. In the open state, the first telescopic rod separates from the last telescopic rod, and the metal mesh sleeve opens from its circumferential closed-loop connection. Both the support frame and the metal mesh sleeve are in an open-loop shape. In the closed state, the first telescopic rod is connected to the last telescopic rod, and the metal mesh sleeve closes from its circumferential closed-loop connection point. Both the support frame and the metal mesh sleeve are in a closed-loop shape.

2. The electromagnetic interference protection device according to claim 1, characterized in that, The metal mesh sleeve is wavy in its circumferential direction, and its circumferential dimension increases as the telescopic rod extends and decreases as the telescopic rod shortens.

3. The electromagnetic interference protection device according to claim 2, characterized in that, The telescopic rod includes at least two axially joined straight rods, and adjacent straight rods are slidable relative to each other along the axial direction.

4. The electromagnetic interference protection device according to claim 1, characterized in that, The electromagnetic interference protection device also includes fasteners; The fasteners are installed between the first and last telescopic rods, and at intervals along the length of the metal mesh sleeve at the closed-loop connections in the circumferential direction of the metal mesh sleeve.

5. The electromagnetic interference protection device according to claim 1, characterized in that, The support frame includes two portal telescopic rods, which are connected together along a first docking direction to form a rectangular closed loop, and the two portal telescopic rods can move relative to each other in the first docking direction; Each of the portal telescopic rods includes two L-shaped rods connected along a second docking direction perpendicular to the first docking direction, and the two L-shaped rods are movable relative to each other in the second docking direction; The metal mesh sleeve is wavy in its circumferential direction, and its circumferential dimension increases as the portal telescopic rod extends and decreases as the portal telescopic rod shortens.

6. The electromagnetic interference protection device according to claim 5, characterized in that, The two portal-shaped telescopic rods are the first portal-shaped telescopic rod and the second portal-shaped telescopic rod, respectively. One of the L-shaped rods of the first portal telescopic rod includes a first end connected to the other L-shaped rod of the first portal telescopic rod and a second end connected to the second portal telescopic rod, and the first end and the second end are hinged together. In the open state, the other L-shaped rod of the first portal telescopic rod separates from the second portal telescopic rod, and the metal mesh sleeve opens from its circumferential closed-loop connection. Both the support frame and the metal mesh sleeve are in an open-loop shape. In the closed state, the other L-shaped rod of the first portal telescopic rod is connected to the second portal telescopic rod, and the metal mesh sleeve closes from its circumferential closed-loop connection point. Both the support frame and the metal mesh sleeve are in a closed-loop shape.

7. The electromagnetic interference protection device according to claim 6, characterized in that, The electromagnetic interference protection device also includes fasteners; The fasteners are disposed between the two portal telescopic rods and at intervals along the length of the metal mesh sleeve at the closed-loop connection points on the circumference of the metal mesh sleeve.

8. The electromagnetic interference protection device according to any one of claims 1-7, characterized in that, The metal mesh sleeve is wavy in its length direction and can extend and retract back and forth between the support frame along its length direction.

9. The electromagnetic interference protection device according to claim 8, characterized in that, The metal mesh sleeve includes adjacent protrusions and recesses along its length to form the wave shape; The support frame is connected to the two opposite ends along the length of the metal mesh sleeve, as well as to the protrusions and recesses of the metal mesh sleeve.

10. The electromagnetic interference protection device according to any one of claims 1-7, characterized in that, The electromagnetic interference protection device also includes a grounding clamp installed on the metal mesh sleeve, and the metal mesh sleeve is connected to the grounding wire on the cable tray through the grounding clamp.

11. The electromagnetic interference protection device according to any one of claims 1-7, characterized in that, The outer surface of the metal mesh sleeve and the support frame is coated with an anti-rust and waterproof coating.

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