CN219779515U - Nuclear power plant power cabinet with front and rear doors - Google Patents

Abstract

The utility model discloses a front and back door-opening power supply cabinet of a nuclear power plant, which comprises a cabinet body, a front door hinge, a back door and a connecting piece, wherein the front door hinge is connected with the front door hinge; the rear door hinge comprises a fixed seat arranged on the butt joint part of at least one upright post at the rear side of the cabinet body and a rotating seat which is suitable for rotating around a vertical rotating shaft relative to the fixed seat; the back door is fixedly connected with the rotating seat, and the rotating shaft is positioned at the outer side of the back door and is suitable for rotating relative to the cabinet body to open or close the opening at the back side of the cabinet body; the connecting piece is fixedly connected to the surface of one backward side of the upright post provided with the rear door hinge, and is provided with a connecting part extending to the rear side opening of the cabinet body; the linking portion extends from top to bottom, and when the back door closes the cabinet body rear side opening, the linking portion towards one side surface of back contacts with the inboard surface of back door. By adopting the technical scheme, the problem of inconvenient maintenance and overhaul of the electric elements, which are close to the rear side of the cabinet body, in the power cabinet can be solved.

Description

Nuclear power plant power cabinet with front and rear doors

Technical Field

The utility model relates to the field of power supply cabinets, in particular to a front-back door-opening power supply cabinet of a nuclear power plant.

Background

The power cabinet is equipped in the nuclear power plant to realize specific electric regulation function, the existing power cabinet generally comprises a cabinet body and a plurality of electric elements positioned in the cabinet body, four upright posts are arranged at four corners of the cabinet body, a plurality of cross beams are arranged to connect the four upright posts to form a frame, cover plates are locked on the rear side, the left side, the right side and the top bottom side of the frame through bolts, a cavity for installing the electric elements is formed, the power cabinet is further connected with a cabinet door on the front side of the frame through a hinge, and the cabinet door can be turned over by the relative frame to open or close the power cabinet. When the power cabinet with the structure is used for maintaining and repairing the internal elements, the operation can only be performed from the front cabinet door, if the electric elements close to the rear side of the cabinet body are to be maintained, the other elements before the electric elements can only be detached, or the cover plate at the rear side of the cabinet body is detached, and the operation is performed from the rear side of the cabinet body. Obviously, both of these methods are relatively inconvenient.

Disclosure of Invention

The utility model aims to overcome the defects or problems in the background art and provide a front-back door-opening power cabinet of a nuclear power plant, which can solve the problem of inconvenient maintenance and overhaul of electrical elements close to the rear side of a cabinet body in the power cabinet.

In order to achieve the above purpose, the following technical scheme is adopted:

the utility model provides a nuclear power plant power rack of back-and-forth door, it includes the cabinet body, the front door and the hinge of front door, the cabinet body includes the frame that is formed by a plurality of stands and crossbeam cooperation and is used for covering the left and right opening of frame, top and bottom open-ended apron; the upright post positioned at the rear side of the cabinet body is provided with a butt joint part towards one side of the adjacent upright post, and two ends of the cross beam are suitable for being fixedly connected with the butt joint parts of the two opposite upright posts connected with the cross beam; the front door is arranged on at least one upright post positioned on the front side of the cabinet body through the front door hinge so as to open or close the front side opening of the cabinet body; it also includes: the rear door hinge comprises a fixed seat arranged on a butt joint part of at least one upright post at the rear side of the cabinet body and a rotating seat which is suitable for rotating around a vertical rotating shaft relative to the fixed seat; the rear door is fixedly connected with the rotating seat, the rotating shaft is positioned at the outer side of the rear door and is suitable for rotating relative to the cabinet body to open or close the rear side opening of the cabinet body; the connecting piece is fixedly connected to the surface of one backward side of the upright post provided with the rear door hinge, and is provided with a connecting part extending to the rear side opening of the cabinet body; the connecting portion extends from top to bottom, and when the back door is closed the cabinet body rear side opening, the backward side surface of the connecting portion contacts with the inside surface of the back door.

Further, the fixing seat of the rear door hinge penetrates through the connecting portion so that the rotating shaft is located outside the connecting portion.

Further, the connecting piece further comprises a mounting part fixedly connected to the upright post and a step part used for connecting the mounting part and the connecting part; the connecting part and the mounting part form a step-shaped structure through the step part, and the connecting part is close to the front side of the cabinet body relative to the mounting part; the edge of one side of the back door, which is close to the connecting piece, is suitable for being abutted to the step part when the back door closes the opening at the back side of the cabinet body.

Further, the back door comprises a door body and a shielding part extending from the upper edge of the door body towards the inner side of the back door; the shielding part is suitable for reaching the upper part of the cabinet body when the rear door is opened to close the rear side opening of the cabinet body.

Further, at least two rear door hinges are arranged along the vertical direction corresponding to each rear door.

Further, the fixing seat of the rear door hinge comprises a first fixing piece and a second fixing piece, wherein the first fixing piece is fixedly connected to the abutting part along the left-right direction and is provided with a protruding part extending towards the rear side opening of the cabinet body; the second fixing piece is fixedly connected to the protruding part along the front-rear direction and is provided with a rotating shaft installation part penetrating through the connecting part; the rotating shaft is rotatably arranged on the rotating shaft mounting part along the vertical direction and is in rotation-stopping connection with the rotating seat.

Further, the rotating seat of the rear door hinge comprises a rotating shaft connecting part and a door body connecting part; the rotating shaft connecting part is fixedly connected with the rotating shaft; the door body connecting part is positioned at the outer side of the door body and fixedly connected with the door body.

Compared with the prior art, the scheme has the following beneficial effects:

in the existing power cabinet, a front door hinge mounting position is reserved on a front side upright post of a cabinet body, for example, the front door hinge can be directly mounted on a front side surface of a front side upright post of the cabinet body, the front door is designed in advance, and under the condition that the front door hinge is built in, the front door can be opened and closed, and good IP protection can be ensured when the front door is closed. However, in the existing power supply cabinet, a part for installing a hinge is not reserved on the rear side upright post of the cabinet body, the rear side opening of the general power supply cabinet is covered by a cover plate, and the cover plate can be directly locked on the rear side surface of the rear side upright post of the cabinet body through a bolt lock, so that the rear door is difficult to install in the existing power supply cabinet.

In this regard, the applicant utilizes the butt joint part on the upright post for locking the cross beam to install the fixing seat of the rear door hinge, because the butt joint part is arranged on the original upright post, and the upright post arranged at the rear side of the cabinet body faces one side of the adjacent upright post, after the fixing seat is installed on the butt joint part, the space in the front-rear direction of the cabinet body cannot be occupied, and then the rotating seat can be fixedly connected with the rear door, and the two can rotate relatively through the vertical rotating shaft between the fixing seat and the rotating seat, so that the rear door can also rotate relative to the cabinet body to open or close the rear side opening of the cabinet body; simultaneously, pivot on the back door hinge still is located the outside of back door, consequently this back door hinge is external hinge for back door relatively, consequently back door inboard need not to design the structure that is used for holding the hinge, and the thickness of back door can greatly reduced, and back door hinge only rotate the protruding part of seat on the back door hinge in the size that power rack front and back orientation occupied to furthest reduces the influence that leads to the fact to the whole front and back orientation of power rack because of setting up back door at cabinet body rear side.

In addition, a connecting piece is arranged, a connecting part is arranged on the connecting piece, and when the rear opening door closes the rear opening of the cabinet body, one side surface of the connecting part facing backwards is contacted with the inner side surface of the rear opening door; because the back door needs to rotate relative to the cabinet body, when the back door is closed, a gap exists at the place where the back door is closed, so that the IP protection effect is reduced, and for this reason, a connecting piece is arranged on the back side upright post, so that the joint part is connected with the connecting part when the back door is closed, the gap existing when the back door is closed is reduced as much as possible, the IP protection effect of the whole power cabinet is ensured, and the back door has a certain waterproof effect and can effectively prevent foreign matters from entering. Particularly, when the power cabinet is applied to the environment of a nuclear power plant, as the nuclear power plant is generally built in places with large wind waves such as seasides and the like, the IP protection effect of the power cabinet is required to be higher.

The fixing seat of the rear door hinge penetrates through the connecting portion to enable the rotating shaft to be located outside the connecting portion, the rear door can be guaranteed not to be interfered by the connecting portion when the rear door rotates, and meanwhile the rear door can be contacted with the connecting portion when the rear door is closed.

The connecting piece is further provided with a mounting part and a step part, and one side edge of the connecting piece can be abutted to the step part when the rear door is closed, so that the rear side of the power cabinet can be kept flat.

The back door comprises a door body and a shielding part, the shielding part can be positioned above the cabinet body when the back door is closed, and the gap between the back door and the upper side of the cabinet body is shielded, so that the IP protective performance of the power cabinet is improved.

At least two rear door hinges are distributed along the vertical direction, so that the stability of the rear door when the rear door is opened and closed is ensured.

The fixing seat of the rear door hinge comprises a first fixing piece and a second fixing piece, and the fixing seat and the rotating seat can be conveniently installed by matching the first fixing piece and the second fixing piece.

The rotating seat of the rear door hinge comprises a rotating shaft connecting part and a door body connecting part, so that the rotating shaft can be conveniently kept at the outer side of the door body.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments, the following brief description of the drawings is provided, in which:

fig. 1 is a schematic structural diagram 1 of an embodiment of a front-back door power supply cabinet of a nuclear power plant according to the present utility model;

fig. 2 is a schematic structural diagram 2 of an embodiment of a power supply cabinet of a nuclear power plant with front and rear doors according to the present utility model;

fig. 3 is a schematic structural view 3 of an embodiment of a front-back door power supply cabinet of a nuclear power plant according to the present utility model;

fig. 4 is a schematic structural view 1 of a vertical column, a back door hinge, a back door and a connector in an embodiment of a front-back door power cabinet of a nuclear power plant according to the present utility model;

FIG. 5 is an enlarged view of portion A of FIG. 4;

fig. 6 is a schematic structural view 2 of a vertical column, a rear door hinge, a rear door and a connector in an embodiment of a front-back door power cabinet for a nuclear power plant according to the present utility model;

fig. 7 is an enlarged view of a portion B in fig. 6.

The main reference numerals illustrate:

a cabinet body 1; a front door 2; a front door hinge 3; a column 4; a cross beam 5; a cover plate 6; a butt joint section 7; a rear door hinge 8; a fixed seat 9; a rotating shaft 10; a rotating seat 11; a rear opening door 12; a joint member 13; a joint 14; a mounting portion 15; a step portion 16; a door body 17; a shielding portion 18; a first fixing member 19; a second fixing member 20; a projection 21; a rotation shaft mounting portion 22; a rotation shaft connection part 23; a door body connecting portion 24.

Detailed Description

In the claims and in the description, unless otherwise defined, the terms "first," "second," or "third," etc., are used for distinguishing between different objects and not for describing a particular sequential order.

In the claims and the specification, unless otherwise defined, the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc., refer to an orientation or positional relationship based on that shown in the drawings, and are merely for convenience of description, and do not imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation.

In the claims and specification, unless otherwise defined, the terms "fixedly coupled" and "fixedly connected" are to be construed broadly as any manner of connection without a displacement relationship or relative rotational relationship therebetween, and that is to say include non-detachably fixedly connected, integrally connected, and fixedly connected by other means or elements.

In the claims and specification, unless otherwise defined, the terms "comprising," having, "and variations thereof mean" including but not limited to.

Examples

The technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings.

The embodiment provides a nuclear power plant power cabinet with front and back doors, which comprises a cabinet body 1, a front door 2, a front door hinge 3, a back door hinge 8, a back door 12 and a connecting piece 13.

Referring first to fig. 1, 2 and 3, the front and rear side openings of the power cabinet are all shown in an open state. The cabinet body 1 of the power supply cabinet comprises a frame formed by matching a plurality of upright posts 4 and cross beams 5, and a cover plate 6 for covering left and right openings and top and bottom openings of the frame; the upright post 4 positioned at the rear side of the cabinet body 1 is provided with a butt joint part 7 towards one side of the adjacent upright post 4, and two ends of the cross beam 5 are suitable for being fixedly connected with the butt joint parts 7 of the two opposite upright posts 4 connected with the cross beam.

Referring to fig. 1 and 2, the cabinet 1 includes four upright posts 4, where the four upright posts 4 are located at four vertices of a square in horizontal projection, and two upright posts 4 are located at front sides and two upright posts 4 are located at rear sides, taking the direction shown in fig. 1 as an example; referring to fig. 3, cross beams 5 are respectively provided at the rear side, the left side and the right side of the cabinet body 1 at upper, middle and lower positions along the vertical direction, and the cross beams 5 can connect two adjacent columns 4, so that the columns 4 and the cross beams 5 cooperate to form a frame. In this embodiment, the cross member 5 is not provided at the front side of the cabinet 1 to form a front opening at the front side of the cabinet 1. The rear side of the cabinet 1 is provided with cross members 5, but openings are still formed between the cross members 5. Openings are formed on the left and right sides and the top and bottom sides of the cabinet 1, but the openings can be covered by a cover plate 6. After the cover plate 6 is fixedly connected to the frame, the cabinet body 1 forms a framework with front and rear open and left and right sides and top and bottom closed.

Referring to fig. 6 and 7, the upright posts 4 of the cabinet 1 are provided with the butt joint parts 7, wherein two upright posts 4 positioned at the rear side are provided with two butt joint parts 7 in the left-right direction and the front-rear direction toward the adjacent upright posts 4, while two upright posts 4 positioned at the front side are provided with one butt joint part 7 only in the front-rear direction, and both ends of the cross beam 5 can be fixedly connected to the corresponding butt joint parts 7 by means of bolt locking. The abutting portion 7 is formed by bending a metal material forming the pillar 4 from an edge position, and in this embodiment, the abutting portion 7 provided for the pillar 4 located at the right rear has a surface facing the left side.

The front door 2 is provided with a plurality of front door hinges 3 along a vertical direction on a surface facing the front side, and the front door 2 is connected with the front door hinges 3 to rotate relative to the cabinet 1 and open or close a front side opening of the cabinet 1. The power cabinet has a front opening door 2 of conventional design and is not described in detail herein.

Referring to fig. 2 and 3, the power cabinet further includes a rear door hinge 8, a rear door 12, and an engagement member 13. Referring to fig. 4 and 5, each rear door hinge 8 includes a fixed seat 9 mounted on the abutting portion 7 of at least one upright post 4 at the rear side of the cabinet 1, and a rotating seat 11 adapted to rotate about a vertical rotation axis 10 relative to the fixed seat 9. Referring to fig. 5 and 7, the fixing base 9 of the rear door hinge 8 includes a first fixing piece 19 and a second fixing piece 20, the first fixing piece 19 is fixedly connected to the abutting portion 7 in the left-right direction and is provided with a protruding portion 21 extending toward the rear side opening of the cabinet 1, the second fixing piece 20 is fixedly connected to the protruding portion 21 in the front-rear direction and is provided with a rotating shaft 10 mounting portion 15, and the rotating shaft 10 is rotatably mounted on the rotating shaft 10 mounting portion 15 in the vertical direction and is in rotation-stopping connection with the rotating seat 11; the rotating seat 11 comprises a rotating shaft 10 connecting part and a door body 17 connecting part, wherein the rotating shaft 10 connecting part is fixedly connected with the rotating shaft 10, and the door body 17 connecting part is fixedly connected with the back door 12.

Specifically, referring to fig. 7, the first fixing member 19 is substantially L-shaped, one side wall thereof is fixed by bolting to the left-facing side surface of the abutting portion 7 of the right rear pillar 4, and the other side wall of the first fixing member 19 forms a protruding portion 21, and the protruding portion 21 extends into the rear opening of the cabinet 1 toward the left side. The second fixing member 20 is also substantially L-shaped, one side wall of which is screwed and fixed with the protruding portion 21 of the first fixing member 19 in the front-rear direction by a bolt, and the other side wall of which extends rearward and forms the mounting portion 15 of the rotating shaft 10, and the mounting portion 15 of the rotating shaft 10 is provided with an insertion hole into which the rotating shaft 10 is inserted and which is rotatable relative to the second fixing member 20. The installation part 15 of the rotating shaft 10 on the rotating seat 11 and the rotating shaft 10 form a rotation stopping fit through a screw joint or other modes, namely the rotating seat 11 and the rotating shaft 10 are relatively fixed in the rotating shaft direction of the rotating shaft 10, so that the rotating seat 11 can rotate around the rotating shaft 10 relative to the fixed seat 9. The rotary seat 11 is also provided with a door 17 connecting part, and the door 17 connecting part can be fixedly connected with the back door 12 through bolts.

Referring to fig. 4 and 6, the rear opening door 12 is fixedly connected with the rotating base 11, and the rotating shaft 10 is located at the outer side of the rear opening door 12, and the rear opening door 12 is adapted to rotate relative to the cabinet 1 to open or close the rear opening of the cabinet 1. Referring to fig. 4, the back door 12 is a door-like member including a door body 17 forming a main body portion of the back door 12, and a shielding portion 18 extending from an upper edge of the door body 17 toward an inside of the back door 12, the shielding portion 18 being adapted to reach above the cabinet 1 when the back door 12 closes a rear side opening of the cabinet 1.

Specifically, referring to fig. 5, the edge of the door body 17 of the back door 12 is locked with the connection part of the door body 17 on the rotating seat 11 in the back door hinge 8 through bolts, so that the back door 12 is connected with the back door hinge 8, and the connection part of the rotating shaft 10 on the rotating seat 11 is positioned outside the door body 17 after the rotating seat 11 is fixedly connected with the back door 12, so that the rotating shaft 10 is also positioned outside the door body 17, an external hinge structure is formed, and the thickness of the door body 17 of the back door 12 is reduced. A shielding portion 18 is provided at the upper edge of the door body 17, and the shielding portion 18 extends toward the inside of the back door 12, where the inside refers to the back door 12 as a reference, and is toward the inside of the cabinet 1 and toward the outside of the cabinet 1 when the back door 12 is closed. The shielding part 18 can shield the gap between the rear door 12 and the upper cross beam 5 of the cabinet body 1 after the rear door 12 is closed, so that the IP protection performance of the power cabinet is improved.

Referring to fig. 4 and 5, the engaging member 13 is fixedly connected to a rear-facing side surface of the upright post 4 provided with the rear door hinge 8, and is provided with an engaging portion 14 extending to the rear-side opening of the cabinet 1, the engaging portion 14 extends from top to bottom, and when the rear door 12 closes the rear side of the cabinet 1, the rear-facing side surface of the engaging portion 14 is connected to the inner side surface of the rear door 12. The connecting piece 13 further comprises a mounting part 15 fixedly connected to the upright post 4 and a step part 16 for connecting the mounting part 15 and the connecting part 14, the connecting part 14 and the mounting part 15 form a step structure through the step part 16, and the connecting part 14 is close to the front side of the cabinet body 1 relative to the mounting part 15; the edge of the rear door 12 near the engagement piece 13 is adapted to abut against the step portion 16 when the rear door 12 closes the rear side opening of the cabinet 1.

Specifically, referring to fig. 4, the engagement member 13 is an elongated plate-like member, and referring to fig. 5, the engagement member 13 includes a mounting portion 15 forming a main body thereof, and in this embodiment, the mounting portion 15 is fixedly mounted on a rearward facing side surface of the right rear pillar 4 by a bolt and extends in a vertical direction up to a bottom end position of the pillar 4. A step portion 16 is provided on the left side of the mounting portion 15, the step portion 16 extends toward the front side of the cabinet 1, and it can be considered that the step portion 16 is formed by bending the edge of the mounting portion 15; the step portion 16 is provided with a connecting portion 14 in an extending manner, the connecting portion 14 extends towards the left side of the cabinet body 1, and the mounting portion 15, the step portion 16 and the connecting portion 14 are matched to form a step-shaped structure. The fixing seat 9 of the back door hinge 8 further penetrates through the connecting portion 14 to enable the rotating shaft 10 to be located outside the connecting portion 14, and the arrangement is such that the back door 12 cannot interfere with and collide with the connecting piece 13 when rotating.

When the back door 12 is in a closed state, the inner side surface of the edge of the back door 12 contacts with the surface of the connecting part 14 facing the rear side of the cabinet body 1, and meanwhile, the edge of the back door 12 is abutted to the position of the step part 16, so that certain IP protection effect is achieved, and meanwhile, the flatness of the rear side surface of the power cabinet can be ensured. Wherein the rear opening door 12 is closed with its outer surface substantially flush with the surface of the mounting portion 15.

In this embodiment, four back door hinges 8 are disposed vertically corresponding to each back door 12, and in other embodiments, only one back door hinge 8 may be disposed, but two back door hinges are preferably disposed at the top and bottom positions, so as to ensure that the back door 12 is opened and closed smoothly. Meanwhile, in the present embodiment, only one back door 12 is provided, but in other embodiments, two left and right doors 12 may be provided, and the implementation is similar to the above description.

In this embodiment, the abutment 7 of the post 4 for locking the cross beam 5 is used to mount the fixing seat 9 of the back door hinge 8, because the abutment 7 is already disposed on the original post 4 and the abutment 7 is disposed on one side of the post 4 at the back side of the cabinet 1 facing the adjacent post 4, after the fixing seat 9 is mounted on the abutment 7, the space in the front-back direction of the cabinet 1 is not occupied, and then the rotating seat 11 can be fixedly connected with the back door 12, so that the two can rotate relatively through the vertical rotating shaft 10 between the fixing seat 9 and the rotating seat 11, and therefore the back door 12 can also rotate relative to the cabinet 1 to open or close the back side opening of the cabinet 1; meanwhile, the rotating shaft 10 on the rear door hinge 8 is further located at the outer side of the rear door 12, so that the rear door hinge 8 is an external hinge relative to the rear door 12, the inner side of the rear door 12 is not required to be provided with a structure for accommodating the hinge, the thickness of the rear door 12 can be greatly reduced, and the occupied size of the rear door 12 and the rear door hinge 8 in the front-rear direction of the power cabinet is only the protruding part of the rotating seat 11 on the rear door hinge 8, so that the influence on the whole front-rear direction of the power cabinet caused by the rear door 12 arranged at the rear side of the cabinet body 1 is reduced to the greatest extent. In addition, an engagement piece 13 is provided, an engagement portion 14 is provided on the engagement piece 13, and when the rear door 12 closes the rear side opening of the cabinet 1, a rear-facing side surface of the engagement portion 14 contacts with an inner side surface of the rear door 12; because the back door 12 needs to rotate relative to the cabinet body 1, when the back door 12 is closed, a gap may exist at a place where the back door 12 is connected with the cabinet body 1 to reduce the IP protection effect, and for this reason, the rear side upright post 4 is provided with the connecting piece 13, so that the place where the back door 12 is connected with the connecting piece 14 when the back door 12 is closed, thereby reducing the gap existing when the back door 12 is closed as much as possible and ensuring the IP protection effect of the whole power cabinet.

The above description and examples are illustrative of the scope of the utility model and are not to be construed as limiting the scope of the utility model.

Claims (7)

1. The utility model provides a nuclear power plant power cabinet of back-and-forth door, it includes cabinet body (1), preceding door (2) and preceding door hinge (3), cabinet body (1) include by a plurality of stand (4) and crossbeam (5) cooperate the frame that forms and be used for covering opening about the frame, apron (6) of top and bottom opening; the upright post (4) positioned at the rear side of the cabinet body (1) is provided with a butt joint part (7) towards one side of the adjacent upright post (4), and two ends of the cross beam (5) are suitable for being fixedly connected with the butt joint parts (7) of the two opposite upright posts (4) connected with the cross beam; the front door (2) is arranged on at least one upright post (4) positioned on the front side of the cabinet body (1) through the front door hinge (3) so as to open or close the front side opening of the cabinet body (1); it is characterized by also comprising:

the rear door hinge (8) comprises a fixed seat (9) arranged on a butt joint part (7) of at least one upright post (4) at the rear side of the cabinet body (1), and a rotating seat (11) which is suitable for rotating around a vertical rotating shaft (10) relative to the fixed seat (9);

the rear door (12) is fixedly connected with the rotating seat (11), the rotating shaft (10) is positioned at the outer side of the rear door (12) and is suitable for rotating relative to the cabinet body (1) to open or close the rear side opening of the cabinet body (1); and

a connecting piece (13) fixedly connected to the surface of one backward side of the upright post (4) provided with the rear door hinge (8), and provided with a connecting part (14) extending to the rear side opening of the cabinet body (1); the engagement portion (14) extends from top to bottom, and when the back door (12) closes the rear side opening of the cabinet body (1), one side surface of the engagement portion (14) facing the rear is in contact with the inner side surface of the back door (12).

2. A front and rear door power cabinet for a nuclear power plant according to claim 1, wherein the fixing base (9) of the rear door hinge (8) penetrates the engagement portion (14) so that the rotating shaft (10) is located outside the engagement portion (14).

3. A front and rear opening power supply cabinet for a nuclear power plant according to claim 2, wherein the engaging member (13) further comprises a mounting portion (15) for being fixedly connected to the upright (4) and a step portion (16) for connecting the mounting portion (15) and the engaging portion (14); the connecting part (14) and the mounting part (15) form a step-shaped structure through the step part (16), and the connecting part (14) is close to the front side of the cabinet body (1) relative to the mounting part (15); one side edge of the back door (12) close to the connecting piece (13) is suitable for being abutted to the step part (16) when the back door (12) closes the rear side opening of the cabinet body (1).

4. A front and rear opening power supply cabinet for a nuclear power plant according to claim 3, wherein the rear opening door (12) comprises a door body (17) and a shielding part (18) extending from an upper edge of the door body (17) toward an inner side of the rear opening door (12); the shielding part (18) is suitable for reaching the upper part of the cabinet body (1) when the back door (12) closes the rear side opening of the cabinet body (1).

5. A front and rear opening power supply cabinet for a nuclear power plant according to claim 4, wherein at least two rear door hinges (8) are arranged vertically corresponding to each of the rear opening doors (12).

6. The front-back door-opening power supply cabinet for a nuclear power plant according to claim 5, wherein the fixing seat (9) of the back door hinge (8) comprises a first fixing piece (19) and a second fixing piece (20), and the first fixing piece (19) is fixedly connected to the abutting part (7) along the left-right direction and is provided with a protruding part (21) extending towards the rear side opening of the cabinet body (1); the second fixing piece (20) is fixedly connected to the protruding part (21) along the front-back direction and is provided with a rotating shaft (10) installation part (15) penetrating through the connecting part (14); the rotating shaft (10) is rotatably arranged on the mounting part (15) of the rotating shaft (10) along the vertical direction and is in rotation-stopping connection with the rotating seat (11).

7. The front-back door-opening power supply cabinet for a nuclear power plant according to claim 6, wherein the rotating seat (11) of the back door hinge (8) comprises a connecting part of a rotating shaft (10) and a connecting part of a door body (17); the connecting part of the rotating shaft (10) is fixedly connected with the rotating shaft (10); the connecting part of the door body (17) is positioned at the outer side of the door body (17) and fixedly connected with the door body (17).