Protective device

Abstract

The utility model provides a protective device, and relates to the technical field of network security. The protection device comprises a protection shell, a cover plate, a plurality of rubber limiting columns and a plurality of protection buffering pieces. The protective shell is of a shell structure with an opening in one end and is provided with a rectangular containing cavity matched with the isolation device, and the four corners of the containing cavity are each provided with a rubber limiting column. The cover plate covers the opening end of the protective shell in a sealing mode, and in the sealing state, the inner surface of the cover plate is attached to the isolation device arranged in the containing cavity; the multiple protection buffer pieces are arranged on the cavity wall of the containing cavity and used for isolating the isolation device from the cavity wall of the containing cavity. According to the protection device, the problem that the safety instrument network isolation device arranged in the shell in the prior art is damaged due to collision or displacement of the safety instrument network isolation device in the shell under the condition that the shell is pushed over by external force is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to network security technical field, specifically relates to a protection device. BACKGROUND

[0002] Network security refers to the hardware, software and data in the system thereof are protected, and are not damaged, altered, leaked due to accidental or malicious reasons, the system continuously, reliably and normally operates, and the network service is not interrupted, and the safety instrument network isolation device is set up in order to protect the network security. At present, the safety instrument network isolation device is wrapped and protected by setting the cover shell, so that the safety instrument network isolation device is isolated from the outside, and the buffer pad is arranged on the side in the cover shell to buffer the impact that may occur between the safety instrument network isolation device and the inner wall of the cover shell, but when the cover shell is pushed over by external force, the safety instrument network isolation device still collides and displaces in the cover shell, so that the safety instrument network isolation device is damaged, and the service life of the safety instrument network isolation device is reduced.

[0003] Therefore, an apparatus is needed to solve at least one of the above problems. SUMMARY

[0004] The utility model embodiment aims at the problem that the safety instrument network isolation device arranged in the shell is collided or displaced in the shell and further causes the damage of the safety instrument network isolation device when the shell is pushed over by external force in the prior art.

[0005] In order to achieve the above object, the utility model provides a protection device for placing safety instrument network isolation device, the protection device includes:

[0006] The protection device further includes a protective shell, a cover plate, a plurality of rubber limiting columns and a plurality of protective buffer pieces.

[0007] The protective shell is a shell structure with one end opening, has a rectangular accommodating cavity matched with the safety instrument network isolation device, and one rubber limiting column is arranged at each corner of the accommodating cavity.

[0008] The cover plate is capped at the opening end of the protective shell, and the inner surface of the cover plate is attached to the safety instrument network isolation device placed in the accommodating cavity in the capped state.

[0009] A plurality of protective buffer pieces are arranged on the cavity wall of the accommodating cavity, and are used for isolating the safety instrument network isolation device from the cavity wall.

[0010] Specifically, the protection device further includes a plurality of annular rubber pads.

[0011] A plurality of annular rubber pads are sequentially arranged and fixed on the cavity bottom of the accommodating cavity to form a placement surface on the cavity bottom of the accommodating cavity, and the safety instrument network isolation device is placed on the placement surface.

[0012] Specifically, a strip-shaped groove is formed on the outer edge of the open end of the protective shell, a guide strip that is shaped to match the groove is arranged on the cover plate, and in the capped state, the guide strip of the cover plate can be embedded in the annular groove to seal the accommodating cavity.

[0013] Specifically, a plurality of connecting through holes are formed on the cavity wall of the accommodating cavity, and when the safety instrument network isolation device is placed in the accommodating cavity, the network wiring can be connected to the electrical interface of the connecting protrusion of the safety instrument network isolation device through the plurality of connecting through holes.

[0014] Specifically, a receiving groove that is shaped to match the connecting protrusion of the safety instrument network isolation device is formed on the cavity wall of the accommodating cavity, the connecting protrusion of the safety instrument network isolation device can be embedded in the receiving groove, and the electrical interface of the connecting protrusion is arranged towards the groove bottom of the receiving groove, wherein the plurality of connecting through holes are formed in the groove bottom of the receiving groove and the electrical interface of the connecting protrusion one-to-one.

[0015] Specifically, the protective device further comprises a plurality of telescopic tightening assemblies arranged on the side cavity wall opposite to the receiving groove in the accommodating cavity, for tightening the safety instrument network isolation device so that the connecting protrusion of the safety instrument network isolation device is embedded in the receiving groove.

[0016] Each telescopic tightening assembly comprises a telescopic base, a telescopic jack and a spring.

[0017] Specifically, the telescopic base is arranged on the side cavity wall opposite to the receiving groove in the accommodating cavity, and a telescopic hole is formed on the telescopic base.

[0018] The spring is arranged in the telescopic hole, and the two ends of the spring are respectively connected to the hole bottom of the telescopic hole and the movable end of the telescopic jack, and the spring can apply a spring force to the telescopic jack.

[0019] The telescopic end of the telescopic jack is movably embedded in the telescopic hole and can move along the extension direction of the telescopic hole, and the movable end of the telescopic jack is exposed from the telescopic hole, and when the safety instrument network isolation device is placed in the accommodating cavity, the spring can apply a spring force to the telescopic jack to tighten the safety instrument network isolation device through the movable end of the telescopic jack so that the connecting protrusion of the safety instrument network isolation device is embedded in the receiving groove.

[0020] Specifically, a heat dissipation through hole is further formed on the cavity wall of the accommodating cavity for heat dissipation of the safety instrument network isolation device.

[0021] Specifically, a shielding plate is arranged on the outer wall of the protective shell and is located above the heat dissipation through hole, so as to prevent rainwater from entering the containing cavity through the heat dissipation through hole.

[0022] Specifically, the protective buffer is a rubber pad or an air bag.

[0023] The protective device provided by the utility model has a rectangular containing cavity which is adapted to the safety instrument network isolation device, rubber limiting columns are arranged at four corners in the containing cavity, when the safety instrument network isolation device is placed in the containing cavity, the safety instrument network isolation device can be limited in a limited range in the containing cavity through the multiple rubber limiting columns, contact between the safety instrument network isolation device and the cavity wall of the containing cavity is avoided, meanwhile, protective buffers are arranged on the cavity wall of the containing cavity, contact between the safety instrument network isolation device and the cavity wall of the containing cavity is avoided, after the safety instrument network isolation device is placed in the containing cavity, the cover plate covers the opening end of the protective shell and is attached to the safety instrument network isolation device, in this way, the rubber limiting columns, the protective buffers and the cover plate can avoid contact between the safety instrument network isolation device and the cavity wall of the containing cavity when the protective device is overturned, and collision or friction between the safety instrument network isolation device and the cavity wall of the containing cavity of the protective shell is avoided.

[0024] Other features and advantages of the utility model embodiment will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the utility model embodiment and constitute a part of the specification, and are used together with the following specific embodiment to explain the utility model embodiment, but do not constitute the limitation to the utility model embodiment. In the drawings:

[0026] Figure 1 It is the structure schematic view of the protective device provided by an embodiment of the utility model;

[0027] Figure 2 It is Figure 1 It is the explosion schematic view of the protective device in the embodiment;

[0028] Figure 3 It is Figure 2 It is the local amplification schematic of A in the embodiment;

[0029] Figure 4 It is Figure 2 It is the local amplification schematic of B in the embodiment;

[0030] Figure 5is a structure schematic view of the protective shell in the protective device and provided by an embodiment of the utility model;

[0031] Figure 6 is a top view of the protective shell in the protective device and provided by an embodiment of the utility model;

[0032] Figure 7 is a three-dimensional schematic view of the telescopic top-tightening assembly of the protective device and provided by an embodiment of the utility model;

[0033] Figure 8 is Figure 7 a sectional view of the telescopic top-tightening assembly of the protective device.

[0034] Explanation of reference signs

[0035] 1-protective shell;2-bottom plate;4-connection via hole;5-rubber limiting column;6-protection buffer;7-groove;8-heat dissipation through hole;9-shielding plate;10-safety instrument network isolation device;11-ring rubber pad;12-stud;14-connection bump;15-cover plate;16-telescopic base;17-telescopic top rod;18-spring;20-telescopic top-tightening assembly;21-limiting block;22-limiting groove;23-guiding spring. Specific embodiments

[0036] The specific embodiments described hereinbelow with reference to the drawings are intended to illustrate and explain the utility model, and are not intended to limit the utility model.

[0037] In the embodiments of the utility model, the orientation words such as 'upper', 'lower', 'top', 'bottom' used without contrary description are generally directed to the directions shown in the drawings or the position relationship descriptions of the components with each other in the vertical, perpendicular or gravity direction.

[0038] Figure 1 is a structure schematic view of the protective device; Figure 2 is Figure 1 an explosion schematic view of the protective device;

[0039] Figure 3 is Figure 2 a local enlarged schematic of A; Figure 4 is Figure 2 a local enlarged schematic of B; Figure 5 is a structure schematic view of the protective shell in the protective device; Figure 6 is a top view of the protective shell in the protective device; Figure 7 is a three-dimensional schematic view of the telescopic top-tightening assembly of the protective device; Figure 8 is Figure 7A sectional view of a telescopic top pressing assembly of a protection device.

[0040] As Figures 1-8 shown, the utility model provides a protection device for placing safety instrument network isolation device 10, the protection device includes:

[0041] protective shell 1, cover plate 15, multiple rubber limiting columns 5 and multiple protective buffer 6s;

[0042] The protective shell 1 is the housing structure of one end opening, has the rectangular accommodating cavity of being suitable for safety instrument network isolation device 10, the four corners of accommodating cavity are all provided with a rubber limiting column 5;

[0043] The cover plate 15 is capped in the open end of protective shell 1, under the capped state, the inner surface of cover plate 15 is attached with safety instrument network isolation device 10 placed in accommodating cavity;

[0044] Multiple protective buffer 6s are set up on the cavity wall of accommodating cavity, for isolating safety instrument network isolation device 10 with the cavity wall of accommodating cavity.

[0045] The protection device provided by the utility model sets up a rubber limiting column 5 at the four corners of the accommodating cavity of protective shell 1, when safety instrument network isolation device 10 is placed in accommodating cavity, multiple rubber limiting columns 5 can limit safety instrument network isolation device 10 in the limited range in accommodating cavity, at the same time, multiple protective buffer 6s are set up on the cavity wall of accommodating cavity, safety instrument network isolation device 10 is isolated with the cavity wall of accommodating cavity through protective buffer 6, when cover plate 15 is capped in the open end of protective shell 1, the side of cover plate 15 towards accommodating cavity is closely attached with safety instrument network isolation device 10, so as to press safety instrument network isolation device 10 in accommodating cavity through cover plate 15, when the protection device is pushed over, safety instrument network isolation device 10 can be isolated with the cavity wall of accommodating cavity through rubber limiting column 5 and protective buffer 6, cover plate 15 can prevent safety instrument network isolation device 10 from moving between the cavity bottom of accommodating cavity and cover plate 15, so as to avoid the friction or collision of safety instrument network isolation device 10 with the cavity wall of accommodating cavity, solve the problem of safety instrument network isolation device in the shell in prior art under the condition of shell being pushed over by external force, causing the collision or displacement of safety instrument network isolation device in the shell, and further leading to the damage of safety instrument network isolation device.

[0046] In one embodiment, the safety instrumented network isolation device 10 is placed at the bottom of the receiving cavity. To prevent the safety instrumented network isolation device 10 from colliding with the bottom of the receiving cavity, the protective device further includes multiple annular rubber pads 11. The multiple annular rubber pads 11 are sequentially arranged and fixed to the bottom of the receiving cavity to form a mounting surface on the bottom of the receiving cavity, on which the safety instrumented network isolation device 10 is placed. Multiple vent holes are provided at the bottom of the receiving cavity. Heat dissipation holes 8 are also provided on the cavity wall of the receiving cavity for heat dissipation of the safety instrumented network isolation device 10.

[0047] like Figure 2 As shown, multiple annular rubber pads 11 are arranged at the bottom of the receiving cavity. The side of the multiple annular rubber pads 11 facing away from the bottom of the receiving cavity forms a mounting surface. The safety instrument network isolation device 10 is placed on the mounting surface of the annular rubber pads 11, and the multiple annular rubber pads 11 isolate the safety instrument network isolation device 10 from the bottom of the receiving cavity. In order to dissipate heat from the safety instrument network isolation device 10, multiple heat dissipation holes 8 are provided in the cavity wall of the receiving cavity, and multiple vent holes are opened in the bottom of the receiving cavity. By opening vent holes in the bottom of the receiving cavity, the bottom of the receiving cavity has a mesh structure. The safety instrument network isolation device 10 dissipates heat through the heat dissipation holes 8 and the vent holes. At the same time, the mesh structure of the cavity bottom can also prevent mosquitoes from entering the receiving cavity. An air flow channel is formed between the vent holes and the heat dissipation holes 8, which facilitates the air flow in the receiving cavity.

[0048] To facilitate the placement of the safety instrumented network isolation device 10 within the receiving cavity, such as Figure 2 As shown, the protective shell 1 has a surrounding plate and a bottom plate 2. The surrounding plate is assembled from multiple plates. The surrounding plate and the bottom plate 2 are detachably connected by studs 12. The surrounding plate and the bottom plate 2 are connected to form a receiving cavity. An annular rubber pad 11 is provided on the bottom plate 2.

[0049] To restrict the movement of the safety instrumented network isolation device 10 within the receiving cavity, a strip-shaped groove 7 is formed along the outer edge of the open end of the protective housing 1. A guide strip, conforming to the shape of the groove 7, is provided on the cover plate 15. In the sealed state, the guide strip of the cover plate 15 is embedded in the groove 7 to seal the receiving cavity. Both the guide strip and the groove 7 are annular. In the sealed state, the guide strip is embedded in the groove 7, preventing the cover plate 15 from slipping off the open end of the protective housing 1.

[0050] To facilitate the use of the safety instrument network isolation device 10, multiple connection holes 4 are provided on the cavity wall of the receiving cavity. When the safety instrument network isolation device 10 is placed inside the receiving cavity, the network wiring can be connected to the electrical interface of the connection protrusion 14 of the safety instrument network isolation device 10 through the multiple connection holes 4.

[0051] The cavity wall of the accommodating cavity is provided with a receiving groove matched with the connecting protrusion 14 of the safety instrument network isolation device 10, the connecting protrusion 14 of the safety instrument network isolation device 10 can be embedded in the receiving groove, and the electrical interface of the connecting protrusion 14 is arranged towards the groove bottom of the receiving groove, wherein the plurality of connecting through holes 4 are arranged in one-to-one correspondence between the groove bottom of the receiving groove and the electrical interface of the connecting protrusion 14.

[0052] The connecting protrusion 14 of the safety instrument network isolation device 10 is arranged between the outer side of the safety instrument network isolation device 10 and the cavity wall of the accommodating cavity, the receiving groove is arranged at the corresponding position of the cavity wall of the accommodating cavity and the connecting protrusion, when the safety instrument network isolation device 10 is accommodated in the accommodating cavity, the connecting lead can be connected with the corresponding electrical interface of the connecting protrusion 14 of the safety instrument network isolation device 10 through the connecting through hole 4, the connecting protrusion 14 of the safety instrument network isolation device 10 is embedded in the receiving groove arranged on the cavity wall of the accommodating cavity, and the connecting through hole 4 is arranged in the groove bottom of the receiving groove, so that the safety instrument network isolation device 10 can be further limited, and the stable connection between the electrical interface of the safety instrument network isolation device 10 and the connecting lead can be ensured.

[0053] In order to avoid the damage of the safety instrument network isolation device 10 caused by the rainwater entering the accommodating cavity through the heat dissipation through hole 8, as shown in Figure 5 and Figure 6 , the outer wall of the protective shell 1 is provided with a shielding plate 9 located above the heat dissipation through hole 8, which is used to prevent the rainwater from entering the accommodating cavity through the heat dissipation through hole 8.

[0054] In order to embed the connecting protrusion 14 of the safety instrument network isolation device 10 into the receiving groove, the protection device further comprises: a plurality of telescopic jacking assemblies 20 arranged on the side wall opposite to the receiving groove in the accommodating cavity, which are used to jacking the safety instrument network isolation device 10 so that the connecting protrusion 14 of the safety instrument network isolation device 10 is embedded into the receiving groove.

[0055] Each telescopic jacking assembly 20 comprises: a telescopic base 16, a telescopic jacking rod 17 and a spring 18.

[0056] The telescopic base 16 is arranged on the side wall opposite to the receiving groove in the accommodating cavity, and a telescopic hole is arranged on the telescopic base 16.

[0057] The spring 18 is arranged in the telescopic hole, and the two ends of the spring 18 are respectively connected with the hole bottom of the telescopic hole and the movable end of the telescopic jacking rod 17, and the spring 18 can apply a spring force to the telescopic jacking rod 17.

[0058] The telescopic end of the telescopic jacking rod 17 is movably embedded in the telescopic hole and can move along the extension direction of the telescopic hole. The movable end of the telescopic jacking rod 17 is exposed to the telescopic hole, and when the safety instrument network isolation device 10 is placed in the accommodating cavity, the spring 18 is used to apply elastic force to the telescopic jacking rod 17 to tightly press the safety instrument network isolation device 10 through the movable end of the telescopic jacking rod 17, so that the connecting lugs 14 of the safety instrument network isolation device 10 are embedded into the accommodating grooves.

[0059] As shown in Figure 7 and Figure 8 The telescopic base 16 is installed in the accommodating cavity, and the telescopic hole is formed in the telescopic base 16. The telescopic end of the telescopic jacking rod 17 is movably embedded in the telescopic hole and can move along the extension direction of the telescopic hole. The bottom of the telescopic hole and the telescopic end of the telescopic jacking rod 17 are provided with the spring 18. When the safety instrument network isolation device 10 is placed in the accommodating cavity, the movable end of the telescopic jacking rod 17 is pressed to increase the embedding depth of the telescopic end of the telescopic jacking rod 17 in the telescopic hole. At this time, the telescopic end of the telescopic jacking rod 17 applies pressure to the spring 18 to compress the spring 18. After the safety instrument network isolation device 10 is placed in the accommodating cavity, the pressing of the movable end of the telescopic jacking rod 17 is released. The telescopic jacking rod 17 pushes the safety instrument network isolation device 10 under the elastic force of the spring 18, so that the connecting lugs 14 of the safety instrument network isolation device 10 are embedded into the accommodating grooves.

[0060] In order to control the moving direction of the telescopic jacking rod 17, a pair of limiting grooves 22 are symmetrically formed on the hole wall of the telescopic hole along the extension direction of the telescopic hole on the telescopic base 16. A pair of limiting blocks 21 are symmetrically arranged on the telescopic jacking rod 17. The limiting blocks 21 correspond to the limiting grooves 22 one by one. A pair of guide holes are formed on the telescopic jacking rod 17 along the radial direction of the telescopic jacking rod 17. Each limiting block 21 is arranged in a corresponding guide hole and can move along the extension direction of the guide hole. A guide spring 23 is connected between the bottom of each guide hole and the side of the limiting block 21 facing the bottom of the guide hole. The limiting block 21 can be embedded in the guide hole by pressing. When the pressing of the limiting block 21 is released, the limiting block 21 can extend into a corresponding limiting groove 22 under the elastic force of the guide spring 23. When the limiting block 21 moves along the extension direction of the telescopic hole, the limiting block 21 moves in the corresponding limiting groove 22. The limiting groove 22 can limit the moving distance of the limiting block 21, that is, the moving distance of the telescopic jacking rod 17 in the telescopic hole.

[0061] The end face of the movable end of the telescopic jacking rod 17 can be provided with a rubber cushion to avoid damaging the surface of the safety instrument network isolation device 10 when the movable end of the telescopic jacking rod 17 tightly presses the safety instrument network isolation device 10.

[0062] In order to limit the safety instrument network isolation device 10 by the rubber limiting column 5, the contact surface of each rubber limiting column 5 with the safety instrument network isolation device 10 is a first contact surface, the contact surface of the safety instrument network isolation device 10 with the rubber limiting column 5 is a second contact surface, and the first contact surface and the second contact surface are matched.

[0063] The accommodating cavity of the protective shell 1 is rectangular, and the safety instrument network isolation device 10 is rectangular, as shown in the figure, the first contact surface of the rubber limiting column 5 is formed by splicing two arc surfaces, the intersection of the two arc surfaces forms a concave structure, the second contact surface of the safety instrument network isolation device 10 is formed by connecting two adjacent vertical side surfaces of the safety instrument network isolation device 10, and when the safety instrument network isolation device 10 is placed in the accommodating cavity, the right angle of the second contact surface of the safety instrument network isolation device 10 can be embedded into the concave structure of the first contact surface, so that the safety instrument network isolation device 10 can be better limited in position in the accommodating cavity by the rubber limiting column 5. Figure 6

[0064] In order to isolate the safety instrument network isolation device 10 and the cavity wall of the accommodating cavity by the protective buffer 6, the protective buffer 6 is a rubber pad or an air bag. If the protective buffer 6 is a rubber pad, the size of the rubber pad is determined according to the gap between the safety instrument network isolation device 10 and the cavity wall of the accommodating cavity; if the protective buffer 6 is an air bag, the protective buffer can be filled between the safety instrument network isolation device 10 and the cavity wall of the accommodating cavity by inflating the air bag, so that even if the safety instrument network isolation device 10 moves in the accommodating cavity, the safety instrument network isolation device 10 will collide with the protective buffer 6, avoiding damage to the safety instrument network isolation device 10.

[0065] A protective pad is arranged on the side of the cover plate 15 facing the accommodating cavity, so that when the cover plate 15 covers the open end of the accommodating cavity, there is a protective pad between the safety instrument network isolation device 10 and the cover plate 15, the cover plate 15 is attached to the safety instrument network isolation device 10 through the protective pad, the protective pad also separates the cover plate 15 and the safety instrument network isolation device 10 from direct contact, and the cover plate 15 also presses the safety instrument network isolation device 10 tightly in the accommodating cavity when covering the open end of the accommodating cavity. The arrangement of the protective pad can avoid collision or friction between the safety instrument network isolation device 10 and the cover plate 15.

[0066] ​The protective device provided by the utility model, the protective shell has a rectangular accommodating cavity which is adapted to the safety instrument network isolation device, and rubber limiting columns are arranged at four corners in the accommodating cavity, when the safety instrument network isolation device is placed in the accommodating cavity, the safety instrument network isolation device can be limited in a limited range in the accommodating cavity through the plurality of rubber limiting columns, contact between the safety instrument network isolation device and the cavity wall of the accommodating cavity is avoided, meanwhile, a protective buffer is arranged on the cavity wall of the accommodating cavity, contact between the safety instrument network isolation device and the cavity wall of the accommodating cavity is avoided, after the safety instrument network isolation device is placed in the accommodating cavity, the cover plate covers the opening end of the protective shell and is attached to the safety instrument network isolation device, in this way, the rubber limiting columns, the protective buffer and the cover plate can avoid contact between the safety instrument network isolation device and the cavity wall of the accommodating cavity when the protective device is overturned, and collision or friction between the safety instrument network isolation device and the cavity wall of the accommodating cavity of the protective shell is avoided.

[0067] The preferred embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the utility model within the technical concept of the utility model, and these simple modifications all belong to the protection scope of the utility model.

[0068] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the utility model will not further describe various possible combination manners.

[0069] Those skilled in the art can understand that all or part of the steps of the method for implementing the above-described embodiments can be completed by programs instructing related hardware, the programs are stored in a storage medium, and the programs include a plurality of instructions for causing a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in various embodiments of the utility model. The foregoing storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk and various program code storage media.

[0070] In addition, various different embodiments of the utility model can also be combined in any manner, as long as they do not deviate from the idea of the embodiments of the utility model, and they should also be considered as disclosed contents of the embodiments of the utility model.

Claims

1. A protective device, characterized in that A protective device for placing a safety instrument network isolation device (10), the protective device comprising: a protective shell (1), a cover plate (15), a plurality of rubber limiting posts (5) and a plurality of protective buffers (6); the protective shell (1) is a shell structure with one end open, has a rectangular accommodating cavity matched with the safety instrument network isolation device (10), and is provided with one rubber limiting post (5) at each of the four corners of the accommodating cavity; the cover plate (15) is capped on the open end of the protective shell (1), and in the capped state, the inner surface of the cover plate (15) is in close contact with the safety instrument network isolation device (10) placed in the accommodating cavity; a plurality of protective buffers (6) are arranged on the cavity wall of the accommodating cavity, and are used for isolating the safety instrument network isolation device (10) from the cavity wall of the accommodating cavity.

2. The guard of claim 1, wherein The protective device further comprises a plurality of annular rubber pads (11); a plurality of annular rubber pads (11) are sequentially arranged and fixed on the cavity bottom of the accommodating cavity to form a placement surface on the cavity bottom of the accommodating cavity, and the safety instrument network isolation device (10) is placed on the placement surface.

3. The guard of claim 1, wherein A strip-shaped groove (7) is formed on the outer edge of the open end of the protective shell (1), the cover plate (15) is provided with a guide strip matched with the shape of the groove (7), and in the capped state, the guide strip of the cover plate (15) is embedded into the groove (7) to seal the accommodating cavity.

4. The guard of claim 1, wherein A plurality of connecting through holes (4) are formed on the cavity wall of the accommodating cavity, and under the condition that the safety instrument network isolation device (10) is placed in the accommodating cavity, network wires can be connected to the electrical interfaces on the connecting protrusions (14) of the safety instrument network isolation device (10) through the plurality of connecting through holes (4).

5. The guard of claim 4, wherein, The cavity wall of the accommodating cavity is provided with a containing groove matched with the shape of the connecting protrusion (14) of the safety instrument network isolation device (10), the connecting protrusion (14) of the safety instrument network isolation device (10) can be embedded into the containing groove, and the electrical interfaces of the connecting protrusion (14) are arranged towards the groove bottom of the containing groove, wherein the plurality of connecting through holes (4) are formed on the groove bottom of the containing groove and correspond to the electrical interfaces on the connecting protrusion (14) one by one.

6. The guard of claim 5, wherein, The protective device further comprises a plurality of telescopic tightening assemblies (20) arranged on the side cavity wall opposite to the containing groove in the accommodating cavity, which are used for tightening the safety instrument network isolation device (10) to embed the connecting protrusion (14) of the safety instrument network isolation device (10) into the containing groove.

7. The guard of claim 5, wherein Each telescopic tightening assembly (20) comprises a telescopic base (16), a telescopic jack (17) and a spring (18); the telescopic base (16) is arranged on the side cavity wall opposite to the containing groove in the accommodating cavity, and the telescopic base (16) is provided with a telescopic hole; the spring (18) is arranged in the telescopic hole, and the two ends of the spring (18) are respectively connected with the hole bottom of the telescopic hole and the movable end of the telescopic jack (17), and the spring (18) can apply a spring force to the telescopic jack (17); The telescopic end of the telescopic ejector rod (17) is movably embedded in the telescopic hole and can move along the extension direction of the telescopic hole, the movable end of the telescopic ejector rod (17) is exposed from the telescopic hole, and when the safety instrument network isolation device (10) is placed in the accommodating cavity, the spring (18) applies elastic force to the telescopic ejector rod (17) to tightly press the safety instrument network isolation device (10) through the movable end of the telescopic ejector rod (17), so that the connecting lug (14) of the safety instrument network isolation device (10) is embedded into the accommodating groove.

8. The guard of claim 1, wherein A heat dissipation through hole (8) is further formed in the cavity wall of the accommodating cavity.

9. The guard of claim 8, wherein, An outer wall of the protective shell (1) is provided with a shielding plate (9) located above the heat dissipation through hole (8) for preventing rainwater from entering the accommodating cavity through the heat dissipation through hole (8).

10. The guard of claim 1, wherein The protective buffer (6) is a rubber pad or an air bag.

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