A guide rail type switching power supply device

Abstract

A kind of guide rail type switching power supply device, including power supply box, first wiring assembly and ground terminal, the bottom end of power supply box is connected with guide rail buckle outside, power supply box includes first plate piece, second plate piece and third plate piece, first plate piece is provided with U shape, second plate piece and third plate piece are all provided with L shape, second plate piece and third plate piece are connected with front and back sides of first plate piece, the bottom of left and right sides of first plate piece is also provided with fixed plate piece, the bottom of second plate piece and the bottom of third plate piece are also stacked connection, fixed plate piece and guide rail buckle are connected with the stacked place of second plate piece and third plate piece by screw, ground terminal is fixedly connected with power supply box, ground terminal is also electrically connected with first wiring assembly.The utility model production efficiency is high, also convenient to install internal device, personnel can also be prevented electric shock and have the effect of shielding electromagnetic interference, use effect is good.

Description

Technical Field

[0001] This utility model relates to the field of switching power supply technology, and in particular to a rail-mounted switching power supply device. Background Technology

[0002] In the field of modern power supply technology, DIN rail power supplies are widely used in almost all electronic devices due to their small size, light weight, and high efficiency, making them an indispensable power supply method in today's rapidly developing electronics and information industry. DIN rail power supplies on the market generally use DIN rail mounting, occupying less space and requiring no screws or other installation tools. They can be neatly arranged inside a box, facilitating not only installation but also later maintenance and replacement. Currently, most DIN rail power supplies on the market are assembled with a double U-shaped structure, making internal components difficult to install and repair. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a rail-mounted switching power supply device that has high production efficiency and is easy to install internal components.

[0004] The technical solution adopted by this utility model to solve its technical problem is a rail-mounted switching power supply device, including a power supply box and a first wiring assembly. The power supply box has a hollow interior with a mounting cavity. The first wiring assembly is housed in the mounting cavity and fixedly connected to the power supply box. The first wiring assembly is used to convert current. A rail clip is also connected to the bottom of the power supply box. The power supply box includes a first plate, a second plate, and a third plate. The first plate is U-shaped, and the second and third plates are both L-shaped. The second and third plates are connected to the front and rear sides of the first plate to form the mounting cavity. Fixed plates are also provided at the bottom of the left and right sides of the first plate. The bottom of the second plate and the bottom of the third plate are stacked. The fixed plates and the rail clip are connected to the stacked part of the second and third plates by screws. The switching power supply device also includes a grounding terminal, which is housed in the mounting cavity and fixedly connected to the power supply box. The grounding terminal is also electrically connected to the first wiring assembly.

[0005] The advantages of the above technical solution are as follows: By decomposing the power supply box into three main parts—a U-shaped first plate, an L-shaped second plate, and an L-shaped third plate—compared to the existing double U-shaped mating structure, the processing difficulty of the power supply box is reduced, and the installation of the first wiring assembly and grounding terminal is made more convenient, greatly improving assembly efficiency. Furthermore, the second and third plates both adopt an L-shaped structure, with their bottoms stacked together. Without increasing the overall thickness of the second and third plates, the bottom strength of the power supply box is higher, improving its load-bearing capacity and ensuring the connection stability between the first plate, guide rail clips, and the second and third plates. The second and third plates are also less prone to deformation. Additionally, by incorporating a grounding terminal, in the event of insulation failure inside the power switch, high voltage may connect to the metal parts such as the power supply box. The grounding terminal allows leakage current to be released through the grounding wire, preventing electric shock. It also serves to shield electromagnetic interference. Therefore, the power supply box features excellent performance, high production efficiency, and ease of internal component installation.

[0006] Furthermore, the first plate has heat dissipation through-hole groups on its left and right sides, and each heat dissipation through-hole group has a first heat dissipation through-hole. The first heat dissipation through-hole is an equilateral triangular through-hole, and the first heat dissipation through-hole can be arranged into a regular hexagonal structure.

[0007] The advantages of the above technical solution are as follows: by setting heat dissipation through holes on both the left and right sides of the first plate, the heat dissipation efficiency of the power supply box is significantly improved. Moreover, the first heat dissipation through hole in the heat dissipation through hole group adopts the form of equilateral triangular through holes, and the first heat dissipation through holes can be arranged to form a regular hexagonal structure. While optimizing the heat dissipation efficiency, the appearance is still beautiful and the design is more reasonable.

[0008] Furthermore, the heat dissipation through-hole group is also provided with a second heat dissipation through-hole and a third heat dissipation through-hole. The second heat dissipation through-hole is a right-angled triangular through-hole, and the third heat dissipation through-hole is an isosceles obtuse triangular through-hole. The length A of the waist of the first heat dissipation through-hole, the second heat dissipation through-hole, and the third heat dissipation through-hole is between 3.5mm and 6.5mm.

[0009] The advantages of adopting the above technical solution are as follows: by setting the second and third heat dissipation through holes, the heat dissipation through hole group can make more reasonable use of the heat dissipation area on the left and right sides of the first plate, resulting in better heat dissipation. Furthermore, by setting the first, second, and third heat dissipation through holes into a triangular structure with specific side lengths, it is possible to prevent foreign objects with larger diameters from entering, effectively preventing personnel's fingers from approaching dangerous parts and reducing accidents caused by accidental contact.

[0010] Furthermore, the apex corners of the first heat dissipation through hole, the second heat dissipation through hole, and the third heat dissipation through hole are all rounded, and the radius B of the rounded corner is between 0.5mm and 0.8mm.

[0011] The advantages of adopting the above technical solution are: the top corners of the first heat dissipation through hole, the second heat dissipation through hole and the third heat dissipation through hole are rounded with a specific radius, which can reduce the difficulty of removing waste material during the processing and effectively prevent dust accumulation at the corners. The structural design is reasonable.

[0012] Furthermore, a first coaxial fixing hole is provided between the bottom of the fixing plate, the guide rail buckle, and the second plate. The bottom of the third plate is stacked on the bottom of the second plate. A positioning member is protruding at a corresponding position on the bottom of the third plate. The positioning member is installed in the first fixing hole on the second plate and also passes through the first fixing hole. The corresponding screws connect the guide rail buckle, the first plate, the second plate, and the third plate by cooperating with the first fixing hole.

[0013] The advantages of the above technical solution are as follows: During installation, the positioning piece on the third plate is first installed in the first fixing hole on the second plate, thus defining the position of the third plate and the second plate. This facilitates the connection of the corresponding screws through the first fixing hole on the fixing plate, the first fixing hole on the guide rail buckle, and the corresponding first fixing hole formed on the positioning piece. The installation and fixing of the guide rail buckle and the first plate are convenient and reasonable. At the same time, after fixing, the power supply box is not easily deformed, and the fitting accuracy is also guaranteed.

[0014] Furthermore, the bottom of the second plate and the bottom of the third plate are provided with coaxial second fixing holes, and the corresponding screws connect the third plate to the second plate by cooperating with the second fixing holes.

[0015] The advantages of the above technical solution are: after the positioning part on the third plate is installed in the first fixing hole on the second plate, the corresponding screws can be fixedly connected through the second fixing hole on the second plate and the second fixing hole on the third plate, so that the second plate and the third plate are fixed first, which facilitates the subsequent installation and fixing of the guide rail buckle and the first plate.

[0016] Furthermore, the first wiring assembly includes a first wiring circuit board with a current converter and a second wiring circuit board with a first terminal block and a second terminal block. A support member is protruding from the upper inner sidewall of the third plate. The first wiring circuit board is attached to the support member. The support member and the first wiring circuit board have a third fixing hole coaxially aligned. Corresponding screws connect the first wiring circuit board to the third plate by cooperating with the third fixing hole. The second wiring circuit board is fixed to the first wiring circuit board and electrically connected to the first wiring circuit board. The first terminal block and the second terminal block are respectively fixed on the left and right sides of the second wiring circuit board and electrically connected to the second wiring circuit board. The first plate also has wiring through holes and locking through holes that cooperate with the first terminal block and the second terminal block.

[0017] The advantages of the above technical solution are as follows: The first wiring circuit board is fixed to the third plate by the corresponding screws and the third fixing hole. The support component prevents the third plate from deforming during the installation of the first wiring circuit board, ensuring the reliability of the power supply box. The installed second wiring circuit board is vertically connected to the first wiring circuit board, thus saving installation space. By setting the first and second terminal blocks, the incoming and outgoing lines are separated on the left and right sides of the power supply box, avoiding contact between the incoming and outgoing lines and thus preventing short circuits, resulting in higher safety. By setting the wiring through holes and locking through holes, operators can directly perform wiring operations without disassembling the power supply box, making the operation simple, convenient and quick.

[0018] Furthermore, a fourth fixing hole is provided between the grounding terminal and the second plate, and a corresponding screw is used to connect the grounding terminal and the second plate through the fourth fixing hole.

[0019] The advantages of the above technical solution are: during installation, the corresponding screws are fixedly connected through the fourth fixing hole on the second plate and the fourth fixing hole on the grounding terminal, so that the grounding terminal is internally fixed on the second plate, making the installation simple and convenient.

[0020] Furthermore, a locking structure is provided between the middle part of the first plate and the upper part of the second plate and the upper part of the third plate.

[0021] The advantages of adopting the above technical solution are: by setting up a snap-fit ​​structure, the power supply box structure is more stable and the structural design is more reasonable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is an exploded view of the structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the first plate component of this utility model;

[0025] Figure 4 This is another view of the first plate structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the second plate structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the third plate component structure of this utility model;

[0028] Figure 7 This is another view of the third plate structure of this utility model;

[0029] Figure 8 This is a schematic diagram of the first wiring assembly of this utility model;

[0030] Figure 9 This is a schematic diagram of the grounding terminal structure of this utility model;

[0031] Figure 10 This is a schematic diagram of the guide rail buckle structure of this utility model.

[0032] In the diagram: 1-Power supply housing, 2-First wiring assembly, 3-Guide rail clip, 4-First plate, 5-Second plate, 6-Third plate, 7-Fixing plate, 8-Screw, 9-Grounding terminal, 10-First heat dissipation hole, 11-Second heat dissipation hole, 12-Third heat dissipation hole, 13-Rounded corner, 14-First fixing hole, 15-Positioning component, 16-Second fixing hole, 17-First wiring circuit board, 18-Current converter, 19-Second wiring circuit board, 20-First terminal block, 21-Second terminal block, 22-Support component, 23-Third fixing hole, 24-Wiring through hole, 25-Locking through hole, 26-Fourth fixing hole, 27-Snap-fit ​​structure. Detailed Implementation

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model and / or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort. Furthermore, references to orientation only indicate the relative positional relationship between the components, not their absolute positional relationship.

[0034] Please see Figures 1 to 10As shown, a rail-mounted switching power supply device includes a power supply housing 1 and a first wiring assembly 2. The power supply housing 1 has a hollow interior with a mounting cavity. The first wiring assembly 2 is housed in the mounting cavity and fixedly connected to the power supply housing 1. The first wiring assembly 2 is used for current conversion. A rail clip 3 is also connected to the bottom of the power supply housing 1. The power supply housing 1 includes a first plate 4, a second plate 5, and a third plate 6. The first plate 4 is U-shaped, and the second plate 5 and the third plate 6 are both L-shaped. The second plate 5 and the third plate 6 form the first plate. The front and rear sides of component 4 are connected to form an installation cavity. Fixing plates 7 are also provided at the bottom of the left and right sides of the first plate 4. The bottom of the second plate 5 and the bottom of the third plate 6 are also stacked. The fixing plates 7 and guide rail clips 3 are connected and engaged with the stacked joints of the second plate 5 and the third plate 6 by screws 8. The switching power supply device also includes a grounding terminal 9, which is housed in the installation cavity and fixedly connected to the power supply housing 1. The grounding terminal 9 is also electrically connected to the first wiring assembly 2. In the above structure, by decomposing the power supply housing 1 into a U-shaped first... The power supply box 1 consists of three main parts: a first plate 4, an L-shaped second plate 5, and an L-shaped third plate 6. Compared to the double U-shaped mating structure used in existing technologies, this design reduces the processing difficulty of the power supply box 1 and facilitates the installation of the first wiring assembly 2 and the grounding terminal 9, greatly improving assembly efficiency. Furthermore, both the second plate 5 and the third plate 6 adopt an L-shaped structure, with their bottoms stacked together. Without increasing the overall thickness of the second plate 5 and the third plate 6, the bottom of the power supply box 1 has higher strength, improving its load-bearing capacity and ensuring the connection stability between the first plate 4, the guide rail clip 3, and the second and third plates 5 and 6. The second plate 5 and the third plate 6 are also less prone to deformation. Additionally, the grounding terminal 9 allows leakage current to be released through the grounding wire in case of insulation failure inside the power switch, preventing electric shock. It also shields against electromagnetic interference. Therefore, the power supply box 1 offers excellent performance, high production efficiency, and ease of internal component installation.

[0035] In this embodiment, heat dissipation through-hole groups are provided on the left and right sides of the first plate 4, and first heat dissipation through-holes 10 are provided in the heat dissipation through-hole groups. The first heat dissipation through-holes 10 are equilateral triangular through-holes and can be arranged to form a regular hexagonal structure. In the above structure, by providing heat dissipation through-hole groups on both the left and right sides of the first plate 4, the heat dissipation efficiency of the power supply box 1 is significantly improved. Moreover, the first heat dissipation through-holes 10 in the heat dissipation through-hole groups adopt the form of equilateral triangular through-holes, and the first heat dissipation through-holes 10 can be arranged to form a regular hexagonal structure. While optimizing the heat dissipation efficiency, the appearance is still beautiful and the design is more reasonable.

[0036] In this embodiment, the heat dissipation through-hole group is further provided with a second heat dissipation through-hole 11 and a third heat dissipation through-hole 12. The second heat dissipation through-hole 11 is a right-angled triangular through-hole, and the third heat dissipation through-hole 12 is an isosceles obtuse triangular through-hole. The length A of the sides of the first heat dissipation through-hole 10, the second heat dissipation through-hole 11, and the third heat dissipation through-hole 12 is between 2mm and 6.5mm. In the above structure, the left and right sides of the first plate 4 will have remaining parts after the first heat dissipation through-hole 10 is formed. The second heat dissipation through-hole 11 and the third heat dissipation through-hole 12 will be set at the remaining parts, thereby achieving the purpose of making full use of the area of ​​the left and right sides of the first plate 4. Therefore, by setting the second heat dissipation through-hole 11 and the third heat dissipation through-hole 12, the heat dissipation area of ​​the heat dissipation through-hole group is more reasonable and the heat dissipation effect is better. In addition, setting the first heat dissipation through-hole 10, the second heat dissipation through-hole 11, and the third heat dissipation through-hole 12 into a triangular structure with specific side lengths can prevent foreign objects with large diameters from entering, effectively prevent personnel's fingers from approaching dangerous parts, and reduce accidents caused by accidental contact.

[0037] In this embodiment, the top corners of the first heat dissipation through hole 10, the second heat dissipation through hole 11, and the third heat dissipation through hole 12 are all rounded corners 13, with a radius between 0.5mm and 0.8mm. In the above structure, the top corners of the first heat dissipation through hole 10, the second heat dissipation through hole 11, and the third heat dissipation through hole 12 are designed with rounded corners 13 of a specific radius, which can reduce the difficulty of removing waste material during the processing, and at the same time effectively prevent dust accumulation at the corners and prevent foreign objects with larger diameters from entering. The structural design is reasonable.

[0038] In this embodiment, the waist length A of the first heat dissipation through hole 10 and the second heat dissipation through hole 11 is 5.2mm, the two waist lengths A of the third heat dissipation through hole are 2mm and 3.5mm respectively, and the radius B of the rounded corner 13 is 0.6mm. It should be noted that the lengths of the two waist lengths A of the third heat dissipation through hole can be appropriately increased.

[0039] In this embodiment, a first fixing hole 14 coaxially arranged is provided between the bottom of the fixing plate 7, the guide rail buckle 3, and the second plate 5. The bottom of the third plate 6 is stacked on the bottom of the second plate 5. A positioning member 15 is protruding at a corresponding position on the bottom of the third plate 6. The positioning member 15 is installed in the first fixing hole 14 on the second plate 5, and the positioning member 15 also passes through the first fixing hole 14. The corresponding screw 8 cooperates with the first fixing hole 14 to make the guide rail buckle 3, the first plate 4, and the second plate 5 and the third plate 6 interlock. In the above structure, during installation, the positioning member 15 on the third plate 6 is first installed in the first fixing hole 14 on the second plate 6. The third plate 6 and the second plate 5 can then form a position limit, which facilitates the corresponding screw 8 to form a fixed connection through the first fixing hole 14 on the fixing plate 7, the first fixing hole 14 on the guide rail buckle 3, and the corresponding first fixing hole 14 formed on the positioning member 15. The installation and fixing of the guide rail buckle 3 and the first plate 4 are convenient and reasonable. At the same time, after fixing, the power supply box 1 is not easy to deform, and the fitting accuracy is also guaranteed.

[0040] In this embodiment, the bottom of the second plate 5 and the bottom of the third plate 6 are provided with coaxial second fixing holes 16. The corresponding screws 8 are connected to the second plate 5 by cooperating with the second fixing holes 16. In the above structure, after the positioning member 15 on the third plate 6 is installed in the first fixing hole 14 on the second plate 5, the corresponding screws 8 can be fixedly connected by the second fixing holes 16 on the second plate 5 and the second fixing holes 16 on the third plate 6, so that the second plate 5 and the third plate 6 are fixed first, thereby facilitating the subsequent installation and fixing of the guide rail buckle 3 and the first plate 4.

[0041] In this embodiment, the first wiring assembly 2 includes a first wiring circuit board 17 with a current converter 18 and a second wiring circuit board 19 with a first terminal block 20 and a second terminal block 21. A support member 22 protrudes from the upper inner sidewall of the third plate 6. The first wiring circuit board 17 is attached to the support member 22. The support member 22 and the first wiring circuit board 17 have a third fixing hole 23 coaxially aligned. The corresponding screws 8 connect the first wiring circuit board 17 to the third plate 6 by engaging with the third fixing hole 23. The second wiring circuit board 19 is fixed to the first wiring circuit board 17 and electrically connected to it. The first terminal block 20 and the second terminal block 21 are respectively fixed on the left and right sides of the second wiring circuit board 19 and electrically connected to it. The first plate 4 also has wiring through holes 24 and locking through holes 25 that cooperate with the first terminal block 20 and the second terminal block 21. In the above structure, the first wiring... The circuit board 17 is fixed to the third plate 6 by the corresponding screws 8 and the third fixing hole 23. The setting of the support member 22 makes the third plate 6 less prone to deformation during the fixed installation of the first wiring circuit board 17, ensuring the reliability of the power supply box 1. The installed second wiring circuit board 19 will be vertically connected to the first wiring circuit board 17, thereby saving installation space. By setting the first terminal block 20 and the second terminal block 21, the incoming and outgoing lines are separated on the left and right sides of the power supply box 1, avoiding contact between the incoming and outgoing lines and thus preventing short circuits, thus improving safety. By setting the wiring through hole 24 and the locking through hole 25, the operator can directly perform wiring operations without disassembling the power supply box, which is simple, convenient and quick. It should be noted that the two wiring through holes 24 are set on the left and right sides of the first plate 4, and the two locking through holes 25 are set in the middle of the first plate 4.

[0042] In this embodiment, a fourth fixing hole 26 coaxially is provided between the grounding terminal 9 and the second plate 5. The corresponding screw 8 connects the grounding terminal 9 and the second plate 5 through the fourth fixing hole 26. In the above structure, during installation, the corresponding screw 8 forms a fixed connection through the fourth fixing hole 26 on the second plate 5 and the fourth fixing hole 26 on the grounding terminal 9, so that the grounding terminal 9 is internally fixed on the second plate 5. The installation is simple and convenient. It should be noted that the bottom of the grounding terminal 9 is provided with a plug pin, and the grounding terminal 9 can also be directly plugged into the second wiring circuit board 19 through the plug pin.

[0043] In this embodiment, a locking structure 27 is provided between the middle part of the first plate 4 and the upper part of the second plate 5 and the upper part of the third plate 6. In the above structure, by setting the locking structure 27, the structure of the power supply box 1 is more stable and the structural design is more reasonable. More specifically, the locking structure 27 can be a locking protrusion and a locking notch.

[0044] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. A rail-mounted switching power supply device, comprising a power supply housing (1) and a first wiring assembly (2), wherein the power supply housing (1) has a hollow interior with a mounting cavity, the first wiring assembly (2) is housed in the mounting cavity and fixedly connected to the power supply housing (1), the first wiring assembly (2) is used for converting current, and a rail clip (3) is also connected to the bottom of the power supply housing (1), characterized in that: The power supply enclosure (1) includes a first plate (4), a second plate (5), and a third plate (6). The first plate (4) is U-shaped, and the second plate (5) and the third plate (6) are both L-shaped. The second plate (5) and the third plate (6) are connected to the front and rear sides of the first plate (4) to form the mounting cavity. The bottom of the left and right sides of the first plate (4) is also provided with a fixing plate (7). The bottom of the second plate (5) and the bottom of the third plate (6) are also stacked. The fixing plate (7) and the guide rail buckle (3) are connected and cooperated with the stacked part of the second plate (5) and the third plate (6) by screws (8). The switching power supply device also includes a grounding terminal (9). The grounding terminal (9) is housed in the mounting cavity and fixedly connected to the power supply enclosure (1). The grounding terminal (9) is also electrically connected to the first wiring assembly (2).

2. The rail-mounted switching power supply device according to claim 1, characterized in that: The first plate (4) is provided with heat dissipation through holes on its left and right sides. The heat dissipation through holes are provided with a first heat dissipation through hole (10). The first heat dissipation through hole (10) is an equilateral triangular through hole and can be arranged into a regular hexagonal structure.

3. The rail-mounted switching power supply device according to claim 2, characterized in that: The heat dissipation through hole group is further provided with a second heat dissipation through hole (11) and a third heat dissipation through hole (12). The second heat dissipation through hole (11) is a right-angled triangular through hole, and the third heat dissipation through hole (12) is an isosceles obtuse triangular through hole. The length A of the waist of the first heat dissipation through hole (10), the second heat dissipation through hole (11), and the third heat dissipation through hole (12) is between 3.5mm and 6.5mm.

4. The rail-mounted switching power supply device according to claim 3, characterized in that: The top corners of the first heat dissipation through hole (10), the second heat dissipation through hole (11), and the third heat dissipation through hole (12) are all rounded corners (13), and the radius B of the rounded corners (13) is between 0.5 mm and 0.8 mm.

5. A rail-mounted switching power supply device according to claim 1, characterized in that: A first fixing hole (14) is provided coaxially between the bottom of the fixing plate (7), the guide rail buckle (3), and the second plate (5). The bottom of the third plate (6) is stacked on the bottom of the second plate (5). A positioning member (15) is protruding at the corresponding position of the bottom of the third plate (6). The positioning member (15) is installed in the first fixing hole (14) on the second plate (5), and the positioning member (15) also passes through the first fixing hole (14). The corresponding screw (8) connects the guide rail buckle (3), the first plate (4), and the second plate (5) with the third plate (6) by cooperating with the first fixing hole (14).

6. A rail-mounted switching power supply device according to claim 5, characterized in that: The bottom of the second plate (5) and the bottom of the third plate (6) are provided with a second fixing hole (16) on the same axis. The corresponding screw (8) connects the third plate (6) and the second plate (5) by cooperating with the second fixing hole (16).

7. A rail-mounted switching power supply device according to claim 1, characterized in that: The first wiring assembly (2) includes a first wiring circuit board (17) with a current converter (18) and a second wiring circuit board (19) with a first terminal block (20) and a second terminal block (21). A support member (22) is protruding from the upper inner wall of the third plate (6). The first wiring circuit board (17) is attached to the support member (22). The support member (22) and the first wiring circuit board (17) are provided with a third fixing hole (23) coaxial with each other. The corresponding screw (8) makes the first wiring assembly (19) more secure by cooperating with the third fixing hole (23). The wiring circuit board (17) is connected to the third board (6). The second wiring circuit board (19) is fixed on the first wiring circuit board (17) and electrically connected to the first wiring circuit board (17). The first terminal block (20) and the second terminal block (21) are respectively fixed on the left and right sides of the second wiring circuit board (19) and electrically connected to the second wiring circuit board (19). The first board (4) is also provided with wiring through holes (24) and locking through holes (25) that cooperate with the first terminal block (20) and the second terminal block (21).

8. A rail-mounted switching power supply device according to claim 1, characterized in that: A fourth fixing hole (26) is provided between the grounding terminal (9) and the second plate (5) on the same axis. The corresponding screw (8) connects the grounding terminal (9) and the second plate (5) through the fourth fixing hole (26).

9. A rail-mounted switching power supply device according to claim 1, characterized in that: A locking structure (27) is provided between the middle part of the first plate (4), the upper part of the second plate (5), and the upper part of the third plate (6).

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