A switch cabinet safety device

Abstract

The present invention discloses a switch cabinet safety device, which at least includes a fixed shell with openings at both ends and in a cylindrical shape, a control mechanism and a protection mechanism, wherein the fixed shell is connected to the switch cabinet, the protection mechanism is arranged in the fixed shell, and the control mechanism is connected to the fixed shell; the control mechanism at least includes an extension mechanism and a radius adjustment mechanism, wherein the extension mechanism is configured to increase the length of the protection mechanism according to the position control of the danger source, and the radius adjustment mechanism is configured to adjust the radius of the protection mechanism according to the size of the danger source. The control mechanism of the present invention can increase the length of the protection mechanism according to the position control of the danger source so as to isolate the dangerous position separately, and can also adjust the radius of the protection mechanism according to the size of the danger source so as to wrap the danger source therein.

Description

Technical Field

[0001] The invention relates to the technical field of switch cabinet safety equipment, in particular to a switch cabinet safety device. Background Art

[0002] With the development of power systems, various switch cabinets have been widely used. At present, a large number of insulating parts are used in switchgear. However, due to design, manufacturing and operating conditions, the insulating parts will gradually age and lose their insulation ability, thus causing safety hazards. The cost of replacing the entire switch cabinet or performing regular maintenance manually is high. Therefore, the use of additional safety equipment is a new focus. The current external equipment has the disadvantages of poor fire control effect, reagents often float on the surface, large storage space, and difficult to change the range of action. Summary of the invention

[0003] In order to overcome the deficiencies of the above technologies, the present invention provides a switch cabinet safety device.

[0004] The technical solution adopted by the present invention to overcome the technical problems is:

[0005] A switch cabinet safety device comprises at least a fixed cylindrical shell with openings at both ends, a control mechanism and a protection mechanism, wherein the fixed shell is connected to the switch cabinet, the protection mechanism is arranged in the fixed shell, and the control mechanism is connected to the fixed shell; the control mechanism comprises at least a growth mechanism and a radius adjustment mechanism, the growth mechanism is configured to increase the length of the protection mechanism according to the position of the hazard source, and the radius adjustment mechanism is configured to adjust the radius of the protection mechanism according to the size of the hazard source.

[0006] Furthermore, the growth mechanism at least includes a growth turntable, a plurality of growth rods, and a growth block storage sleeve evenly distributed around the outer wall of the fixed shell and the number of which is equal to the growth rods. The growth turntable is evenly distributed in an annular shape with arc-shaped slots equal to the number of the growth rods. One end of each growth rod is fixed in the corresponding arc-shaped slot, and the other end is connected to the growth block storage sleeve. At least one growth block is placed in each growth block storage sleeve. An opening is provided at a position corresponding to the growth block storage sleeve on the fixed shell.

[0007] Furthermore, one end of each growth rod located in the growth block storage sleeve is fixedly connected to a push block, and the push block is slidably connected to the inner wall of the growth block storage sleeve.

[0008] Furthermore, the radius adjustment mechanism at least includes a radius adjustment disk, which is rotatably connected to the fixed shell and located between the fixed shell and the growth turntable, and the radius adjustment disk is evenly distributed in an annular manner with two arc-shaped slots equal to the number of growth rods, and one end of the radius adjustment disk provided on the fixed shell is fixed with a linear track equal to the number of the two arc-shaped slots, and an adjustment rod is slidably connected at the intersection of the linear track and the two arc-shaped slots.

[0009] Furthermore, the protection mechanism includes at least two layers of superimposed annular shielding units, a circle of first magnetic parts is arranged on the outer wall of the shielding unit, and a second magnetic part is arranged on the inner wall of the fixed shell, and the shielding unit is adsorbed on the inner wall of the fixed shell by the magnetic force of the first magnetic part and the second magnetic part, each layer of the shielding unit includes at least main body blocks equal to the number of adjusting rods and adjacent main body blocks are connected by a folding structure, wherein the outer end face of each main body block in the outermost layer of the shielding unit is fixedly connected to the end of the adjusting rod away from the linear track.

[0010] Furthermore, the folding structure at least comprises a folding connector and a foldable flexible fire-resistant material, and the folding connector and the flexible fire-resistant material are arranged between each two adjacent columns of main body blocks in the superimposed shielding units.

[0011] Furthermore, the main blocks between the layers are connected by a snap-fit ​​structure, which at least includes a snap-fit ​​slide and a movable snap-fit ​​block matching the snap-fit ​​slide, the snap-fit ​​slide and the movable snap-fit ​​block are respectively arranged on two opposite end faces of the main blocks, and a trigger block is arranged at one end of the movable snap-fit ​​block facing the central axis of the annular shielding unit.

[0012] Furthermore, a fire extinguishing structure is also provided on each main body block, and the fire extinguishing structure at least includes a reagent connecting port and a reagent nozzle. The reagent connecting port runs through the two end faces of each main body block where a positioning slide and a movable block are provided, and the reagent nozzle is connected to the reagent connecting port and the nozzle faces the central axis of the annular shielding unit.

[0013] Furthermore, the growth block is configured to be inserted into the superimposed annular shielding units to increase the length of the shielding units, and each growth block is provided with at least a snap-in structure; the snap-in structure includes at least a snap-in slide and a movable snap-in block matching the snap-in slide, the snap-in slide and the movable snap-in block are respectively arranged on two opposite end faces of the growth block, and a trigger block is arranged at one end of the movable snap-in block facing the central axis of the annular shielding unit.

[0014] Furthermore, each growth block is also provided with a fire extinguishing structure, which at least includes a reagent connecting port and a reagent nozzle. The reagent connecting port runs through the two end faces of each growth block where a positioning slide and a movable block are provided. The reagent nozzle is connected to the reagent connecting port and the nozzle faces the central axis of the annular shielding unit.

[0015] The beneficial effects of the present invention are:

[0016] 1. The control mechanism of the present invention can control the increase of the length of the protection mechanism according to the location of the danger source so as to isolate the danger location, and can also adjust the radius of the protection mechanism according to the size of the danger source so as to wrap the danger source therein.

[0017] 2. The protective mechanism of the present invention can gradually increase its length, so as to isolate the dangerous position separately. Due to the particularity of its connection method, it is not affected by gravity and can cover from top to bottom or from front to back, so it is suitable for covering a dangerous source somewhere in the middle separately without considering the interference of components above or in other parts. Moreover, due to the gradual increase mode, its volume is small and there will be no problem of occupying a large amount of space. Moreover, each main block or growth block can spray fire extinguishing agent, so that the fire extinguishing agent can change the disadvantage of floating on the surface during traditional spraying, and can penetrate deep into the dangerous point for isolation, which has a better fire extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a switch cabinet safety device of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall structure of a switch cabinet safety device of the present invention from another angle;

[0020] Figure 3 yes Figure 1 The main view of

[0021] Figure 4 It is a schematic diagram of the structure of the control mechanism;

[0022] Figure 5 yes Figure 4 The main view of

[0023] Figure 6 yes Figure 4 Side view of

[0024] Figure 7 yes Figure 6 A schematic diagram of the structure at "AA" of FIG.

[0025] Figure 8 It is a schematic diagram of the structure of the protection mechanism;

[0026] Fig. 9 It is a structural diagram of the protection mechanism from another angle;

[0027] Fig.10 yes Figure 8 The main view of

[0028] Fig.11 It is a structural diagram of the main block;

[0029] Fig.12 This is a structural diagram of the main block from another angle;

[0030] Fig.13 It is a schematic diagram of the structure of the growth block;

[0031] Fig.14 This is a schematic diagram of the structure of the growth block from another angle.

[0032] Among them, there are an increasing turntable 10, a fixed shell 11, a radius adjustment disk 12, an increasing block storage sleeve 13, a linear track 14, an increasing rod 15, an adjusting rod 16, a main block 17, a flexible refractory material 18, a folding connector 19, a trigger block 20, a positioning slide 21, a movable card block 22, an increasing block 23, a reagent nozzle 24, a reagent connecting port 25, an arc groove one 26, an arc groove two 27, and a chamfer 28. DETAILED DESCRIPTION

[0033] In order to facilitate those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The following is only exemplary and does not limit the protection scope of the present invention.

[0034] like Figure 1-14 As shown, a switch cabinet safety device described in this embodiment at least includes a fixed shell 11 with two ends open and cylindrical, a control mechanism and a protection mechanism. The fixed shell 11 is connected to the switch cabinet, and the connection position is determined according to the actual situation. The protection mechanism is arranged in the fixed shell 11 and is attracted to the inner wall of the fixed shell through a magnetic member, and the control mechanism is connected to the fixed shell 11. The control mechanism at least includes a growth mechanism and a radius adjustment mechanism. The growth mechanism is configured to increase the length of the protection mechanism according to the position of the danger source so as to separate the danger location, and the radius adjustment mechanism is configured to adjust the radius of the protection mechanism according to the size of the danger source so that it can wrap the danger source therein.

[0035] Specifically, in the present embodiment, the growth mechanism at least includes a growth turntable 10, a plurality of growth rods 15, and n growth block storage sleeves 13 evenly distributed around the outer wall of the fixed shell 11. For the convenience of description, in the present embodiment, n growth rods 15 are set, n is a natural number, and the value of n can be set according to actual conditions, and there is no specific restriction; n arc-shaped slots 26 are evenly distributed in an annular shape on the growth turntable 10, one end of each growth rod 15 is fixed in the corresponding arc-shaped slot 26, and the other end is connected to the growth block storage sleeve 13, and at least one growth block 23 is placed in each growth block storage sleeve 13. Generally, multiple growth blocks 23 are provided to increase the length of the protection mechanism according to the actual situation of the hazard source, and an opening (not shown in the figure) is provided at a corresponding position on the fixed shell 11 to the growth block storage sleeve 13, and the opening is used to allow the growth block 23 to be inserted into the protection mechanism.

[0036] As a preferred solution of this embodiment, one end of each growth rod 15 located in the growth block storage sleeve 13 is fixedly connected with a push block (not shown in the figure), and the push block is slidably connected to the inner wall of the growth block storage sleeve 13. The growth block 23 can be added to the protection mechanism by sliding the push block in the growth block storage sleeve 13.

[0037] Specifically, in this embodiment, the radius adjustment mechanism at least includes a radius adjustment disk 12, which is rotatably connected to the fixed shell 11 and is located between the fixed shell 11 and the growth turntable 10, and the radius adjustment disk 12 is provided with n arc-shaped slots 27 evenly distributed in a ring shape, and one end of the radius adjustment disk 12 provided on the fixed shell 11 is fixed with n linear rails 14, and an adjustment rod 16 is slidably connected at the intersection of the linear rail 14 and the arc-shaped slot 27.

[0038] Specifically, the protection mechanism includes at least two layers of superimposed annular shielding units, a first magnetic member is provided on the outer wall of the shielding unit, a circle of second magnetic members matching the first magnetic member is provided on the inner wall of the fixed shell 11, and the shielding unit is adsorbed on the inner wall of the fixed shell 11 by the magnetic force of the first magnetic member and the second magnetic member. In this embodiment, a protection mechanism with two layers of superimposed annular shielding units is used as an example for detailed description, each layer of shielding units includes at least n main body blocks 17 and adjacent main body blocks 17 are connected by a folding structure, wherein the outer end face of each main body block 17 in one layer of shielding units is fixedly connected to one end of the adjusting rod 16 away from the linear track 14, and the other end of the adjusting rod 16 is slidably connected to the intersection of the linear track 14 and the arc-shaped slot 27. The purpose of setting the magnetic parts (i.e., the first magnetic parts and the second magnetic parts) between the shielding unit and the fixed shell 11 is that when the length of the protective mechanism needs to be increased, the shielding units between the layers will be separated, that is, the main blocks 17 between the layers (i.e., between the main blocks 17 in the axial direction) will be separated, and the magnetic parts will adsorb the main blocks 17 on the inner wall of the fixed shell 11 to prevent the main blocks 17 from scattering; in addition, the first magnetic part may not be set on the outer wall of a layer of shielding units that fix the adjusting rod 16, because the shielding units of this layer are fixedly connected to the adjusting rod 16, and when the length of the protective mechanism needs to be increased, the shielding units of this layer will not scatter under the action of the adjusting rod 16.

[0039] As a preferred embodiment of the present invention, the main body block 17 is trapezoidal in shape as a whole, and the first magnetic member is arranged on the outer end face of the main body block 17. The main body blocks 17 between layers are connected by a snap-fit ​​structure, which at least includes a snap-fit ​​slide 21 and an active snap-fit ​​block 22 matching the snap-fit ​​slide. The snap-fit ​​slide 21 and the active snap-fit ​​block 22 are respectively arranged on two opposite end faces of the main body block 17, wherein a reset spring is arranged in the active snap-fit ​​block 22 so that the active snap-fit ​​block 22 can be reset by the spring, and a trigger block 20 is arranged at one end of the active snap-fit ​​block 22 facing the central axis of the annular shielding unit. Between the main body blocks 17 between layers, the active snap-fit ​​block 22 on one main body block 17 is snapped into the snap-fit ​​slide 21 of another main body block 17 to complete the connection of the two main body blocks 17.

[0040] In addition, it is particularly noted that the buckle structure of the main body block 17 mainly includes three structures, and the main differences are: in the main body block 17 of the first buckle structure, a locking slide 21 and a movable clamping block 22 are respectively provided on two opposite end faces; in the main body block 17 of the second buckle structure, a locking slide 21 is provided on one end face, and the end face opposite to the end face with the locking slide 21 is no longer provided with the movable clamping block 22, because the end face without the movable clamping block 22 does not need to be superimposed with a layer of annular shielding unit, but is used to fix the connection adjusting rod 16; in the main body block 17 of the third buckle structure, a movable clamping block 22 is provided on one end face, and the end face opposite to the end face with the movable clamping block 22 is no longer provided with the locking slide 21, because the end face without the locking slide 21 does not need to be superimposed with a layer of annular shielding unit.

[0041] Furthermore, a locking device (not shown in the figure) is provided on the inner end surface of the main body block 17. The locking device can have various structures. The locking device is mainly used to lock the main body blocks 17 between layers to make the main body blocks 17 in the axial direction more secure. When it is necessary to increase the length of the protection mechanism and separate the main body blocks 17 between layers, the locking device will open and ensure that the main body blocks 17 between layers will not fall off.

[0042] In this embodiment, the folding structure at least includes a folding connector 19 and a foldable flexible refractory material 18, and the folding connector 19 and the flexible refractory material 18 are arranged between each adjacent two columns of main blocks 17 in the superimposed shielding unit, wherein the folding connector 19 uses a folding skeleton, and the flexible refractory material 18 is fixed on the folding skeleton, and the flexible refractory material 18 can be extended and retracted following the extension and retraction of the folding skeleton. Specifically, the two sides of the end surface of the main block 17 on which the positioning slide 21 is arranged are symmetrically provided with notches, and a short axis is arranged on the notch, and the folding connector 19 is rotatably connected to the short axis. Specifically, the two ends of the folding connector 19 are respectively rotatably connected to the short axes of the two adjacent main blocks 17, and the folding connector 19 cooperates with the foldable flexible refractory material 18 to realize the increase or decrease of the radius of the annular shielding unit.

[0043] In this embodiment, a fire extinguishing structure is also provided on each main body block 17, and the fire extinguishing structure at least includes a reagent connecting port 25 and a reagent nozzle 24. The reagent connecting port 25 runs through the two end surfaces of each main body block 17 where a positioning slide 21 and a movable block 22 are provided. The reagent nozzle 24 is connected to the reagent connecting port 25 and the nozzle faces the central axis of the annular shielding unit. If the ring formed by the annular shielding unit is used as the ring, the inner annular surface of the annular shielding unit is called the inner end surface of the main body block 17. The reagent nozzle 24 is distributed on the inner end surface of the main body block 17. In order to make the sprayed fire extinguishing reagent more uniform, four reagent nozzles 24 are provided on the inner end surface of each main body block 17 of this embodiment, and the four reagent nozzles 24 are provided at four corners. Furthermore, the reagent connecting port 25 on each main body block 17 corresponds to the position of the reagent connecting port 25 on other main body blocks 17, thereby ensuring that the fire extinguishing reagent can be supplied to other main body blocks 17 through the reagent connecting port 25 on one main body block 17, and sprayed out in the radial direction of the protection mechanism through the reagent nozzle 24; it should be noted that, in one of the outermost shielding units, the reagent connecting port 25 is not provided on the outer end face of the main body block 17. In this embodiment, it is preferred that the reagent connecting port 25 is not provided on the end face of the main body block 17 for connecting the adjusting rod 16 to prevent the fire extinguishing reagent from being sprayed out in the axial direction of the protection mechanism.

[0044] As a preferred embodiment of the present invention, the growth block 23 is also trapezoidal in shape as a whole. The growth block 23 is configured to be inserted into the superimposed annular shielding units to increase the length of the shielding units. When the length of the protective mechanism needs to be increased, the growth block 23 is added to the protective mechanism, that is, as a part of the shielding unit. Therefore, the outer end face of the growth block 23 is also provided with a first magnetic part. When the growth block 23 continues to be added to the protective mechanism, the growth blocks 23 (or the main blocks 17) between the layers will be separated, and the growth block 23 will be adsorbed on the inner wall of the fixed shell 11 by the magnetic part to prevent the growth block 23 from scattering. Each growth block 23 is provided with at least a snap-fit ​​structure, which includes at least a locking slide 21 and a movable locking block 22 matching the locking slide. The locking slide 21 and the movable locking block 22 are respectively arranged on two opposite end faces of the growth block 23, and a trigger block 20 is arranged at one end of the movable locking block 22 facing the central axis of the annular shielding unit; the locking slide 21, the movable locking block 22 and the trigger block 20 on the growth block 23 have exactly the same structure and size as the locking slide 21, the movable locking block 22 and the trigger block 20 on the main block 17, so that the growth block 23 can be connected to the main block 17. A fire extinguishing structure is also provided on each growth block 23, and the fire extinguishing structure includes at least a reagent connecting port 25 and a reagent nozzle 24. The reagent connecting port 25 runs through the two end surfaces of each growth block 23 where the positioning slide 21 and the movable block 22 are provided. The reagent nozzle 24 is connected to the reagent connecting port 25 and the nozzle faces the central axis of the annular shielding unit. The reagent connecting port 25 on each growth block 23 corresponds to the position of the reagent connecting port 25 on other growth blocks 23 and the main block 17, thereby ensuring that the fire extinguishing reagent can be supplied to other main blocks 17 or growth blocks 23 through the reagent connecting port 25 on one main block 17, and sprayed out through the reagent nozzle 24. In addition, the position distribution of the reagent nozzle 24 on the growth block 23 is the same as the position distribution of the reagent nozzle 24 on the main block 17.

[0045] As a further preferred embodiment, the outer end surface of each main body block 17 is provided with a chamfer 28 to facilitate the insertion of the growth block 23 between adjacent main body blocks 17. Figure 8 and Fig. 9 As shown, the outer end face mentioned here refers to the ring surrounded by the annular shielding unit. As the outer ring face of the annular shielding unit, we call it the outer end face.

[0046] Further preferably, the growth block 23 may not be provided with a notch like the main body block 17, so that the sealing performance of the entire device is better.

[0047] Working principle of the switch cabinet safety device described in this embodiment:

[0048] The control mechanism can be used to control the increase of the length of the protection mechanism according to the location of the danger source so as to isolate the danger location, and can also be used to adjust the radius of the protection mechanism according to the size of the danger source so that it can wrap the danger source. When it is necessary to increase the length of the protection mechanism and adjust the radius of the protection mechanism, the length of the protection mechanism should be increased first, and then the radius of the protection mechanism should be adjusted, because if the radius of the protection mechanism is reduced first, the protection mechanism will be separated from the fixed shell 11, so that the protection mechanism and the fixed shell 11 cannot be attracted together by the suction force of the magnetic part, and the increase of the length of the protection mechanism cannot be completed.

[0049] Specifically, when the length of the protection mechanism needs to be increased, the growth turntable 10 is started to rotate. The rotation of the growth turntable 10 will drive the growth rod 15 to move under the restriction of the linear slot of the growth block storage sleeve 13. The growth rod 15 enables the push block to move in the growth block storage sleeve 13, and pushes the growth block 23 stored in the growth block storage sleeve 13 to move. The trigger block 20 on the growth block 23 will push the movable block 22 to move a distance through the locking slide 21 on the main block 17. When the movable block 22 moves, the locking device is opened, and the movable block 22 will be detached from the main block 17 on the two-layer shielding unit when passing through the corresponding notch on the locking slide 21. At this time, since the trigger block 20 falls into the locking position In the slide 21, the growth block 23 is inserted between the two main blocks 17 that were originally superimposed. When the growth block 23 is fully inserted between the main blocks 23, the locking device is automatically locked, thereby increasing the length of the shielding unit, that is, increasing the length of the protection mechanism. As this process is repeated, its length can be gradually increased. It should be noted that when the length of the protection mechanism continues to be increased, the growth block 23 is added between the growth block 23 and the main block 17 or between the growth block 23 and the growth block 23. When the protection mechanism is extended to a sufficient distance, the fire extinguishing agent can be supplied to the reagent connecting port 25, so that the fire extinguishing agent is sprayed out through the reagent nozzle 24 to complete the fire suppression.

[0050] Specifically, when it is necessary to adjust the radius of the protective mechanism, the radius adjustment disk 12 is started to rotate. The rotation of the radius adjustment disk 12 will drive the adjustment rod 16 to move under the restriction of the linear track 14. Since the arc-shaped slot 27 of the radius adjustment disk 12 is arc-shaped and the radius is variable, the intersection position with the linear track 14 will change during the rotation process, thereby driving the position of the adjustment rod 16 to change. When the adjustment rod 16 moves, it will drive other layers of main body blocks 17 connected to the layer of main body blocks 17 fixedly connected to the adjustment rod 16 to move together, thereby moving outward or inward. As the radius changes, the folding connection 19 will fold or open to adapt to the change in size, thereby changing the range of action (i.e., radius) of the protective mechanism.

[0051] Due to the particularity of the connection method of the protection structure, it is not affected by gravity, and can be covered from top to bottom or from front to back, so it is suitable for covering a dangerous source somewhere in the middle alone without considering the interference of components above or in other parts. Moreover, since it is a gradually growing mode, its volume is small and there will be no problem of occupying a large amount of space. Moreover, each main block 17 or growth block 23 can spray fire extinguishing agents, so that the fire extinguishing agents can change the disadvantage of floating on the surface during traditional spraying, and can penetrate deep into the dangerous point for isolation, which has a better fire extinguishing effect.

[0052] The above only describes the basic principles and preferred embodiments of the present invention. Those skilled in the art may make many changes and improvements based on the above description, and these changes and improvements should fall within the protection scope of the present invention.

Claims

1. A switch cabinet safety device, characterized in that: The invention comprises at least a cylindrical fixed housing (11) with two ends open, a control mechanism and a protection mechanism, wherein the fixed housing (11) is connected to a switch cabinet, the protection mechanism is arranged in the fixed housing (11), and the control mechanism is connected to the fixed housing (11); the control mechanism comprises at least a growth mechanism and a radius adjustment mechanism, the growth mechanism being configured to increase the length of the protection mechanism according to the position of the hazard source, and the radius adjustment mechanism being configured to adjust the radius of the protection mechanism according to the size of the hazard source; The growth mechanism comprises at least a growth turntable (10), a plurality of growth rods (15), and a growth block storage sleeve (13) uniformly distributed around the outer wall of the fixed shell (11) and having a number equal to the number of the growth rods; the growth turntable (10) is uniformly provided with annular arc-shaped slots (26) equal to the number of the growth rods; one end of each growth rod (15) is fixed in a corresponding arc-shaped slot (26) and the other end is connected to the growth block storage sleeve (13); at least one growth block (23) is placed in each growth block storage sleeve (13); and an opening is provided at a position on the fixed shell (11) corresponding to the growth block storage sleeve (13); The radius adjustment mechanism comprises at least a radius adjustment disk (12), the radius adjustment disk (12) being rotatably connected to the fixed housing (11) and being located between the fixed housing (11) and the growth rotating disk (10), the radius adjustment disk (12) being evenly distributed in an annular pattern with two arc-shaped slots (27) equal in number to the growth rods, one end of the radius adjustment disk (12) being provided on the fixed housing (11) being fixed with a linear track (14) equal in number to the two arc-shaped slots, and an adjustment rod (16) being slidably connected at the intersection of the linear track (14) and the two arc-shaped slots (27); The protection mechanism comprises at least two layers of superimposed annular shielding units, a first magnetic member is arranged on the outer wall of the shielding unit, a circle of second magnetic members is arranged on the inner wall of the fixed shell (11), the shielding unit is adsorbed on the inner wall of the fixed shell (11) by the magnetic force of the first magnetic member and the second magnetic member, each layer of shielding units comprises at least a number of main body blocks (17) equal to the number of adjustment rods (16), and adjacent main body blocks (17) are connected by a folding structure, wherein the outer end surface of each main body block (17) in the outermost layer of shielding units is fixedly connected to an end of the adjustment rod (16) away from the linear track (14); Each main body block (17) is also provided with a fire extinguishing structure, the fire extinguishing structure comprising at least a reagent connecting port (25) and a reagent nozzle (24), the reagent connecting port (25) penetrating two end surfaces of each main body block (17) on which a positioning slideway (21) and a movable block (22) are provided, the reagent nozzle (24) being connected to the reagent connecting port (25) and the nozzle facing the central axis of the annular shielding unit.

2. The switch cabinet safety device according to claim 1, characterized in that: One end of each growth rod (15) located in the growth block storage sleeve (13) is fixedly connected to a push block, and the push block is slidably connected to the inner wall of the growth block storage sleeve (13).

3. The switch cabinet safety device according to claim 2, characterized in that: The folding structure comprises at least a folding connection member (19) and a foldable flexible fire-resistant material (18), and the folding connection member (19) and the flexible fire-resistant material (18) are arranged between each two adjacent columns of main body blocks (17) in the superimposed shielding units.

4. The switch cabinet safety device according to claim 2, characterized in that: The main body blocks (17) between the layers are connected via a snap-fit ​​structure, wherein the snap-fit ​​structure comprises at least a snap-fit ​​slideway (21) and a movable snap-fit ​​block (22) matching the snap-fit ​​slideway, the snap-fit ​​slideway (21) and the movable snap-fit ​​block (22) are respectively arranged on two opposite end faces of the main body block (17), and a trigger block (20) is arranged at one end of the movable snap-fit ​​block (22) facing the central axis of the annular shielding unit.

5. The switch cabinet safety device according to claim 2, characterized in that: The growth block (23) is configured to be inserted into the superimposed annular shielding units to increase the length of the shielding units, and each growth block (23) is provided with at least a buckle structure; the buckle structure at least comprises a locking slideway (21) and a movable clamping block (22) matching the locking slideway, the locking slideway (21) and the movable clamping block (22) being respectively arranged on two opposite end faces of the growth block (23), and a trigger block (20) is arranged at one end of the movable clamping block (22) facing the central axis of the annular shielding unit.

6. The switch cabinet safety device according to claim 5, characterized in that: Each growth block (23) is also provided with a fire extinguishing structure, the fire extinguishing structure comprising at least a reagent connection port (25) and a reagent nozzle (24), the reagent connection port (25) penetrating two end surfaces of each growth block (23) on which a positioning slideway (21) and a movable block (22) are provided, the reagent nozzle (24) being connected to the reagent connection port (25) and the nozzle facing the central axis of the annular shielding unit.

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