Low-voltage cabinet safety protection structure

Abstract

The application relates to the technical field of low-voltage cabinets, in particular to a low-voltage cabinet safety protection structure which comprises a main body frame, a sealing plate, a connecting side plate, a panel and a switch cabinet, the sealing plate comprises an upper sealing plate and a lower sealing plate which are arranged on the upper end and the lower end of the main body frame respectively, the connecting side plate is fixedly connected to the circumferences of the upper sealing plate and the lower sealing plate, the switch cabinet is connected with the panel, the panel is further connected with the back connecting side plate through a pin connecting plate and a reinforcing frame body, the back connecting side plate is further connected with the sealing plate and the main body frame, when short circuit occurs and instantaneous impact load is generated, the force can be sequentially transmitted to the main body frame, so that the switch cabinet and the cabinet main body have multiple structure connecting positions, the load is prevented from being concentrated on a single connecting position, the reinforcing frame body is located between the connecting side plate and the pin connecting plate, the connecting position between the panel and the back connecting side plate is supported, and a continuous internal bearing path of the cabinet is formed.

Description

Technical Field

[0001] This invention relates to the field of low-voltage switchgear technology, and in particular to a safety protection structure for low-voltage switchgear. Background Technology

[0002] The low-voltage distribution cabinet of the substation is rated for AC 50Hz and rated voltage 380V. It serves as the power source for the power distribution system, and is used for lighting and power distribution. The product features strong breaking capacity, good dynamic and thermal stability, flexible electrical scheme, convenient combination, strong series and practicality, and novel structure.

[0003] Existing low-voltage switchgear mechanical protection structures for short-circuit conditions typically employ methods such as increasing column thickness, installing fixed reinforcing plates, adding corner supports, or using bolted connections to reinforce the cabinet frame. Some structures also include fixed baffles at the rear end of drawers, the end of panels, or the sides of the cabinet to limit the movement of drawers and panels. These structures mainly rely on fixed connections and rigid supports to withstand instantaneous loads under short-circuit conditions, and the force transmission paths between the various components of the cabinet are relatively fixed.

[0004] However, existing low-voltage switchgear with fixed reinforcement structures typically uses angle steel, reinforcing ribs, or reinforcing frames welded or bolted to the columns, upper sealing plates, and lower sealing plates. Under short-circuit conditions, the busbars, conductor connections, and live components within the drawer-type functional units are subjected to short-circuit electrodynamic forces. The corresponding load can be transferred to the main frame via the drawer guides, mounting plates, panel connectors, and internal cabinet mounting components. Since the reinforcements are mostly fixedly connected to the columns and sealing plates, and there are usually no support components between the column cavities and adjacent columns that can change their assembly position according to the local load conditions, the load is easily concentrated and transferred to the columns. Under the aforementioned stress conditions, the connection between the column and the sealing plate, the connecting side plate and the sealing plate, and the connection end of the reinforcing member may experience local bending or changes in the connection gap. Relative displacement may occur between the connecting side plate and the sealing plate. For parts with bolted connections, the pre-tightening state may change due to relative slippage between the connecting parts. Corner reinforcing members are generally only arranged along the local edge of the cabinet and do not form a support relationship involving the inner support plate of the column, the corner bracing members between adjacent columns, and the sealing plate. Therefore, it is difficult to distribute the support and positional constraint of the stress position at the corner of the cabinet. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a safety protection structure for low-voltage switchgear.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The system includes a main frame, sealing plates, connecting side plates, a front panel, and a switch cabinet. The sealing plates include an upper sealing plate and a lower sealing plate respectively located at the upper and lower ends of the main frame. The connecting side plates are fixedly connected to the periphery of the upper and lower sealing plates. Each of the four corners of the upper surface of the lower sealing plate is connected to a concave column. Each concave column has a hollow cavity, within which a support plate is installed. The support plate has hinged edges on both sides, which are rotatably connected to the concave columns. An angle brace is provided between two concave columns. The side panel, the corner brace side panel is connected to the hinge side, the connecting side panel located on the back side is connected to the reinforcing frame, the reinforcing frame is connected to the pin connecting plate, the panel is connected to the pin connecting plate by bolts, the switch cabinet is connected to the side of the panel away from the pin connecting plate, the upper surface of the lower sealing plate is provided with a main hinge frame, the main hinge frame is rotatably connected to an L-shaped swing frame and a transmission swing frame, the lower end of the L-shaped swing frame is provided with a hook bottom, the front end of the L-shaped swing frame is provided with an outward protruding crossbar A, and the upper surface of the transmission swing frame is provided with an outward protruding crossbar B.

[0007] Preferably, both the protruding crossbar A and the protruding crossbar B are provided with covering holes, and a hollow part is formed between the L-shaped swing frame and the protruding crossbar A for inserting one end of the panel.

[0008] Preferably, a tension spring is connected between the bottom of the hook and the transmission swing frame, the front end of the transmission swing frame is provided with a sealing edge, both sides of the transmission swing frame are provided with pre-tightening sealing edges, the end of the pre-tightening sealing edge is provided with a fitting end, and the fitting end abuts against the angle between the concave column and the lower sealing plate.

[0009] Preferably, there are four concave columns, which are respectively located at the four corners of the lower sealing plate. The support plate has two hinged edges arranged at intervals on both sides, and the hinged edges are arranged along the length of the concave columns.

[0010] Preferably, there are two corner bracing side plates, which are respectively disposed on opposite sides of the lower sealing plate, and each corner bracing side plate is located between two corresponding concave columns.

[0011] Preferably, the reinforcing frame is connected to the side surface of the back connecting side plate facing the interior of the main frame, and the pin connecting plate is connected to the side of the reinforcing frame facing the panel.

[0012] Preferably, the main hinge frame has two opposing inner walls, and the two inner walls are provided with shaft holes for mounting the L-shaped swing frame and the transmission swing frame.

[0013] Preferably, the transmission swing frame is provided with a through hole, one end of the tension spring is connected to the bottom of the hook, and the other end is connected to the through hole.

[0014] Preferably, both the sealing edge and the pre-sealing edge are elastic elements, and the fitting end is located at the end of the pre-sealing edge away from the transmission swing frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are: By connecting the switch cabinet to the panel, and then connecting the panel to the back side panel via a pin-connecting plate, a reinforcing frame, and the back side panel, which is further connected to the sealing plate and the main frame, when a short circuit occurs and a momentary impact load is generated, the force can be transmitted sequentially through the switch cabinet, panel, pin-connecting plate, reinforcing frame, connecting side panel, and sealing plate to the main frame. This provides multiple structural connection points between the switch cabinet and the main cabinet body, preventing the load from being concentrated on a single connection point. The reinforcing frame, located between the connecting side panel and the pin-connecting plate, supports the connection between the panel and the back side panel, thus forming a continuous load-bearing path inside the cabinet.

[0016] The concave columns are set at the corners of the lower cover plate, and the support plates are housed in the hollow cavities of the concave columns. They are rotatably connected to the concave columns through hinged edges. The corner braces are connected between the corresponding hinged edges of adjacent concave columns, so that the concave columns, support plates, and corner braces together form the connecting support structure of the cabinet corner. When short-circuit impact loads are transmitted from the lower cover plate and concave columns to the support plates and corner braces, the loads can be transmitted between adjacent concave columns. The rotatable connection between the support plates and concave columns can also adapt to the relative position changes of the corner components when they are under load, avoiding rigid interference between the support plates and concave columns.

[0017] The panel end is inserted into the hollow section between the L-shaped swing frame and the protruding crossbar A. The wire harness passes through or is accommodated in the covering holes on the protruding crossbar A and the protruding crossbar B. When a short circuit impact causes relative displacement of the panel, the panel end abuts against the L-shaped swing frame or the protruding crossbar A, and drives the L-shaped swing frame to rotate around the main hinge frame. The bottom of the hook at the lower end of the L-shaped swing frame applies traction force to the transmission swing frame through the tension spring, causing the transmission swing frame to rotate around its corresponding axis. When the transmission swing frame rotates, the protruding crossbar B and the covering hole change position accordingly, forming a follow-up constraint on the wire harness passing through the covering hole. The tight sealing edge and the pre-tight sealing edge form elastic contact with the adjacent components and the included angle between the concave column and the lower sealing plate, respectively, to limit the rotation position of the transmission swing frame and adapt to the assembly gap.

[0018] The side of the corner brace facing the inner side of the main frame forms an inner arc surface. The wave-shaped support plate is set in the interlayer of the corner brace side plate and arranged along the extension direction of the corner brace side plate. When the corner brace side plate is subjected to short-circuit impact load and the plate surface tends to be compressed or bent, the wave-shaped support plate is located inside the interlayer and forms a support fit with the opposite plate surface of the corner brace side plate to maintain the relative position of the interlayer. Through the combined arrangement of the wave-shaped support plate and the corner brace side plate, the corner brace side plate has an internal support part arranged continuously along the extension direction between adjacent concave columns, thereby constraining the stress state of the lower corner of the cabinet together with the support plate and the hinge edge. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the main frame of a low-voltage switchgear safety protection structure proposed in this invention; Figure 2 This is a top view schematic diagram of the sealing plate structure of a low-voltage switchgear safety protection structure proposed in this invention; Figure 3 This is a front view schematic diagram of a switchgear structure for a low-voltage switchgear safety protection structure proposed in this invention; Figure 4 This is a schematic diagram of the disassembly structure of the back-side connecting side plate of a low-voltage switchgear safety protection structure proposed in this invention; Figure 5 This is a three-dimensional schematic diagram of the connection between the switchgear and the covering hole in a low-voltage switchgear safety protection structure proposed in this invention; Figure 6 This is a schematic diagram of the pre-tightening sealing edge abutment structure of a low-voltage switchgear safety protection structure proposed in this invention; Figure 7 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 8 This is a top view schematic diagram of the transmission swing frame and L-shaped swing frame structure of a low-voltage switchgear safety protection structure proposed in this invention; Figure 9 This is a schematic diagram of the L-shaped swing frame and the transmission swing frame morphological changes of a low-voltage switchgear safety protection structure proposed in this invention.

[0020] In the diagram: 1. Main frame; 2. Sealing plate; 3. Connecting side plate; 31. Reinforcing frame; 32. Pin connecting plate; 4. Concave column; 5. Support plate; 51. Hinge edge; 6. Corner brace side plate; 61. Wave-shaped support plate; 7. Panel; 8. Switch cabinet; 9. Main hinge frame; 10. L-shaped swing frame; 101. Hook bottom; 102. Outwardly protruding crossbar A; 11. Transmission swing frame; 111. Outwardly protruding crossbar B; 112. Tightening sealing edge; 12. Covering hole; 13. Tension spring; 14. Pre-tightening sealing edge; 141. Fitting end. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships without substantially altering the original intent are permitted. Within the scope of the technical content, it should also be considered as within the scope of the present invention.

[0023] Reference Figures 1-9 A safety protection structure for a low-voltage switchgear includes a main frame 1, a sealing plate 2, connecting side plates 3, a panel 7, and a switchgear 8. The sealing plate 2 includes an upper sealing plate and a lower sealing plate respectively disposed at the upper and lower ends of the main frame 1. The connecting side plates 3 are fixedly connected to the periphery of the upper and lower sealing plates. A concave column 4 is connected to each of the four corners of the upper surface of the lower sealing plate. The concave column 4 has a hollow cavity, and a support plate 5 is provided within the hollow cavity of the concave column 4. Hinged edges 51 are provided on both sides of the support plate 5, and the hinged edges 51 are rotatably connected to the concave column 4. An angle brace side plate 6 is provided between two concave columns 4. The corner brace side plate 6 is connected to the hinge side 51. A reinforcing frame 31 is connected to the connecting side plate 3 on the back side. A pin connecting plate 32 is connected to the reinforcing frame 31. The panel 7 is connected to the pin connecting plate 32 by bolts. The switch cabinet 8 is connected to the side of the panel 7 away from the pin connecting plate 32. The upper surface of the lower sealing plate is provided with a main hinge frame 9. An L-shaped swing frame 10 and a transmission swing frame 11 are rotatably connected inside the main hinge frame 9. The lower end of the L-shaped swing frame 10 is provided with a hook bottom 101. The front end of the L-shaped swing frame 10 is provided with an outward protruding cross bar A102. The upper surface of the transmission swing frame 11 is provided with an outward protruding cross bar B111.

[0024] In the embodiments applying the above technical solution, when the low-voltage switchgear safety protection structure is installed, the main frame 1 constitutes the main load-bearing structure of the cabinet. The sealing plate 2 includes an upper sealing plate disposed at the upper end of the main frame 1 and a lower sealing plate disposed at the lower end of the main frame 1. The connecting side plate 3 is fixedly connected to the periphery of the upper sealing plate and the lower sealing plate, so that the upper sealing plate, the lower sealing plate and the connecting side plate 3 surround the periphery of the main frame 1. The lower sealing plate is used to support the lower components and lower reinforcing components inside the cabinet. Four concave columns 4 are respectively connected to the four corners of the lower sealing plate and extend along the height direction of the cabinet. Furthermore, each concave column 4 has a hollow cavity, and the support plate 5 is disposed in the hollow cavity of the corresponding concave column 4. The hinged edges 51 on both sides of the support plate 5 are rotatably connected to the concave column 4, so that the support plate 5 has the assembly freedom to rotate around the hinged edges 51 relative to the concave column 4. Two hinged edges 51 arranged at intervals can be respectively provided on both sides of the support plate 5. Each hinged edge 51 is arranged along the length direction of the concave column 4, so that the support plate 5 forms a connection part extending along the length direction of the column in the hollow cavity of the concave column 4.

[0025] Two corner bracing side plates 6 located on opposite sides of the lower sealing plate are respectively set between two corresponding concave columns 4. The two ends of the corner bracing side plates 6 are connected to the hinged edges 51 of the support plates 5 inside the adjacent concave columns 4. Therefore, a corner connection structure is formed between the two concave columns 4, the corresponding support plates 5, and the corner bracing side plates 6 on each side. In this connection structure, the concave columns 4 and the lower sealing plate form a vertical and lower support position. The support plates 5 are set inside the concave columns 4, and the corner bracing side plates 6 span across the adjacent concave columns 4. Between them, the side of the corner brace side plate 6 facing the inner side of the main frame 1 is an inner arc surface. A sandwich layer is set inside the inner arc surface. The wave-shaped support plate 61 is connected in the sandwich layer and arranged along the extension direction of the corner brace side plate 6. The wave-shaped support plate 61 and the inner and outer layers of the corner brace side plate 6 together form a composite plate-shaped connection part. When the corner brace side plate 6 is subjected to a force along its length or perpendicular to the plate surface, the wave-shaped support plate 61 is located in the sandwich layer and forms a support fit with the opposite wall of the sandwich layer to maintain the sandwich spacing and plate shape of the corner brace side plate 6.

[0026] A reinforcing frame 31 is connected to the side of the back connecting side plate 3 facing the inside of the main frame 1. A pin connecting plate 32 is connected to the side of the reinforcing frame 31 facing the panel 7. The panel 7 is connected to the pin connecting plate 32 by bolts. The switch cabinet 8 is connected to the side of the panel 7 away from the pin connecting plate 32. The switch cabinet 8, panel 7, pin connecting plate 32, reinforcing frame 31 and back connecting side plate 3 form a connection path in sequence. After the switch cabinet 8 is installed on the panel 7, the force on the panel 7 can be transmitted to the pin connecting plate 32 through the bolt connection, and then to the connecting side plate 3 and the main frame 1 through the reinforcing frame 31.

[0027] The preferred technical solution in this embodiment is: Reference Figures 6 to 9The upper surface of the lower sealing plate is provided with a main hinge frame 9. The main hinge frame 9 has two opposing inner walls, and shaft holes for installing the L-shaped swing frame 10 and the transmission swing frame 11 are formed on the inner walls. The L-shaped swing frame 10 and the transmission swing frame 11 are respectively rotatably installed in the main hinge frame 9 through corresponding rotating shafts. The lower end of the L-shaped swing frame 10 is provided with a hook bottom 101, and the front end is provided with an outwardly protruding crossbar A102. The upper surface of the transmission swing frame 11 is provided with an outwardly protruding crossbar B111, the front end is provided with a sealing edge 112, and the two sides are provided with pre-tightening sealing edges 112. 4. A hollow portion is formed between the protruding crossbar A102 and the L-shaped swing frame 10. One end of the panel 7 is inserted into the hollow portion. Thus, the end of the panel 7 is located within the space defined by the L-shaped swing frame 10 and the protruding crossbar A102. When the panel 7 is displaced in the direction toward the main hinge frame 9, the end of the panel 7 can contact the L-shaped swing frame 10 or the protruding crossbar A102. When the panel 7 moves in the opposite direction, the end of the panel 7 is also constrained by the boundary of the hollow portion between the L-shaped swing frame 10 and the protruding crossbar A102.

[0028] Both the protruding crossbars A102 and B111 are provided with covering holes 12. The wire harness inside the cabinet can pass through the corresponding covering holes 12, or a partial segment of the wire harness can be accommodated in the covering holes 12. After the wire harness is arranged through the covering holes 12, its range of motion in the horizontal and vertical directions is limited by the hole walls of the covering holes 12. The insertion position at the end of the panel 7, the rotation position of the L-shaped swing bracket 10, the rotation position of the transmission swing bracket 11, and the position of the wire harness in the covering holes 12 are arranged correspondingly to each other. A tension spring 13 is connected between the bottom 101 of the hook and the through hole of the transmission swing bracket 11. One end of 3 is hooked to the bottom of the hook 101, and the other end is hooked to the through hole of the transmission swing frame 11. In the initial assembly state, the tension spring 13 applies mutual traction to the L-shaped swing frame 10 and the transmission swing frame 11, so that the two maintain a preset relative rotation position. The mating ends 141 of the pre-tightened sealing edges 14 on both sides of the transmission swing frame 11 abut against the angle between the concave column 4 and the lower sealing plate. Both the sealing edge 112 and the pre-tightened sealing edge 14 are elastic elements. When the transmission swing frame 11 rotates or there is an assembly gap between adjacent components, they can maintain the abutment relationship through their own elastic deformation.

[0029] Reference Figure 5 and Figure 3 In normal operation, the switch cabinet 8 is connected to the back-side connecting plate 3 via the panel 7, the connecting plate 32, and the reinforcing frame 31. The end of the panel 7 is inserted between the L-shaped swing bracket 10 and the protruding crossbar A102. The wiring harness is positioned by the covering holes 12 on the protruding crossbar A102 and the protruding crossbar B111. The transmission swing bracket 11 is held in contact with the concave column 4 and the lower sealing plate by the fitting end 141 of the pre-tightened sealing edge 14. The above components are in their respective initial positions.

[0030] Reference Figure 9At the moment of the short circuit, the conductors, busbars, and mounting components inside the switchgear 8 are subjected to short-circuit electrodynamic forces. This force is transmitted to the panel 7 via the mounting connection of the switchgear 8. The panel 7, through its bolt connection to the connecting plate 32, transfers the load to the reinforcing frame 31. The reinforcing frame 31 then transfers the load to the back connecting side plate 3. The back connecting side plate 3 is fixedly connected to the upper and lower sealing plates, and the load is further transferred to the main frame 1, the lower sealing plate, and the concave column 4. During this process, the panel 7 and its connected components... The cabinet 8 tends to move relative to the main hinge frame 9. Since one end of the panel 7 is pre-inserted into the hollow part between the L-shaped swing frame 10 and the protruding crossbar A102, the end of the panel 7 first contacts the inner boundary of the hollow part. Specifically, when the panel 7 moves in the direction close to the main hinge frame 9, its end abuts against the corresponding side wall of the L-shaped swing frame 10 or the protruding crossbar A102. The abutting force is applied to the L-shaped swing frame 10, causing the L-shaped swing frame 10 to rotate around the axis of rotation between it and the main hinge frame 9.

[0031] When the L-shaped swing frame 10 rotates, the bottom of the hook 101 located at its lower end moves in an arc around the axis of rotation along with the L-shaped swing frame 10. The bottom of the hook 101 is connected to the through hole on the transmission swing frame 11 by a tension spring 13. Therefore, after the spatial position of the bottom of the hook 101 relative to the transmission swing frame 11 changes, the distance between the two ends of the tension spring 13 changes accordingly. The tension spring 13 enters the tension state from its initial length and applies a traction force to the transmission swing frame 11 through the through hole on the transmission swing frame 11. After the transmission swing frame 11 is subjected to the traction force of the tension spring 13, it rotates around the axis of rotation corresponding to it in the main hinge frame 9. The rotation direction of the transmission swing frame 11 is determined by the rotation direction of the L-shaped swing frame 10, the arrangement position of the tension spring 13, and the relative position between the bottom of the hook 101 and the through hole. When the transmission swing frame 11 rotates, the protruding crossbar B111 on its upper surface, the front end sealing edge 112, and the pre-tightening sealing edges 14 on both sides rotate synchronously with the transmission swing frame 11 as a whole.

[0032] After the outward-protruding crossbar B111 rotates, the position of the covering hole 12 on the outward-protruding crossbar B111 relative to the cabinet changes. When the wire harness passes through or is accommodated in the covering hole 12, the wire harness is circumferentially limited by the hole wall of the covering hole 12. When the outward-protruding crossbar B111 rotates with the transmission swing frame 11, the part of the wire harness located in the covering hole 12 moves restricted along the movement path of the covering hole 12. At the same time, the covering hole 12 on the outward-protruding crossbar A102 rotates synchronously with the L-shaped swing frame 10, and the wire harness at the corresponding position moves restricted along with the outward-protruding crossbar A102. Thus, the force displacement of the panel 7, the rotation of the L-shaped swing frame 10, the rotation of the transmission swing frame 11, and the restricted movement of the wire harness in the two covering holes 12 occur sequentially.

[0033] During the process of the transmission swing frame 11 rotating to the predetermined position, the pre-tightening sealing edges 14 on both sides of the transmission swing frame 11 approach or press against the angle between the concave column 4 and the lower sealing plate. After the contact end 141 abuts against the angle, when the transmission swing frame 11 continues to rotate, the pre-tightening sealing edge 14 is compressed and undergoes elastic deformation. The elastic deformation of the pre-tightening sealing edge 14 keeps the contact end 141 pressed against the angle and forms a reverse force on the continued rotation of the transmission swing frame 11.

[0034] At the same time, the sealing edge 112 at the front end of the transmission swing frame 11 moves towards the adjacent cabinet component. When the sealing edge 112 contacts the adjacent component, the sealing edge 112 is compressed and deformed, and an elastic contact is formed between the transmission swing frame 11 and the adjacent component. At this time, one or both sides of the transmission swing frame 11 form a contact with the concave column 4 and the lower sealing plate through the pre-tightening sealing edge 14, and the front end forms a contact with the adjacent component through the sealing edge 112, so that the transmission swing frame 11 is in a state defined by multiple contact positions.

[0035] When the lower part of the cabinet is under load, there may be a tendency for localized stress deformation between the lower sealing plate and the concave column 4. The concave column 4 transfers the load to the support plate 5 inside the hollow cavity. The support plate 5 then transfers the load to the corner brace side plate 6 through the hinged edge 51. Since the corner brace side plate 6 connects between the corresponding hinged edges 51 of adjacent concave columns 4, a force path is formed between the two concave columns 4 through the support plate 5 and the corner brace side plate 6. When the relative position of adjacent concave columns 4 changes due to stress, The support plate 5 can rotate relative to the concave column 4 around the hinged edge 51. The corner brace side plate 6 adjusts its position accordingly as the support plate 5 rotates. The wave-shaped support plate 61 in the interlayer of the corner brace side plate 6 is subjected to the force together with the corner brace side plate 6. When the corner brace side plate 6 is subjected to a compressive load or bending load perpendicular to the plate surface, the wave-shaped support plate 61 is located in the interlayer and supports the relative plate surface of the interlayer. Thus, the load at the bottom of the cabinet can be transferred between the lower sealing plate, the concave column 4, the support plate 5 and the corner brace side plate 6.

[0036] Therefore, during the short-circuit impact load: The force exerted by the switch cabinet 8 on the panel 7 is transmitted to the main frame 1 through the connecting plate 32, the reinforcing frame 31, and the connecting side plate 3, forming a connection path from the panel 7 to the back frame.

[0037] The lower sealing plate, concave column 4, support plate 5, hinge edge 51 and corner brace side plate 6 constitute the connection support path of the lower corner of the cabinet. The wave-shaped support plate 61 in the interlayer of the corner brace side plate 6 provides support to the interlayer plate surface of the corner brace side plate 6.

[0038] The end of panel 7 is positioned by abutting against L-shaped swing frame 10 and outward protruding crossbar A102. L-shaped swing frame 10 drives transmission swing frame 11 to rotate accordingly via tension spring 13.

[0039] The protruding crossbar B111 and the covering hole 12 on the transmission swing frame 11 move with the transmission swing frame 11, forming a follow-up position constraint on the wire harness passing through the covering hole 12.

[0040] The tight sealing edge 112 and the pre-tight sealing edge 14 cooperate with the adjacent components through elastic contact. The contact end 141 maintains contact with the concave column 4 and the lower sealing plate at the angle to limit the rotation position of the transmission swing frame 11.

[0041] After the short-circuit electric force disappears, the external thrust on panel 7 decreases, and the L-shaped swing frame 10 is no longer continuously subjected to the abutting driving force at the end of panel 7. Under the action of elastic restoring force, the tension spring 13 pulls the bottom of hook 101 and the through hole on the transmission swing frame 11 closer to each other, causing the transmission swing frame 11 to rotate around its axis of rotation to the initial position. Through the bottom of hook 101, the L-shaped swing frame 10 is driven to rotate back to the initial position. The protruding crossbar A102, the protruding crossbar B111 and its covering hole 12 are reset with the two swing frames, and the wire harness is restored to the initial wiring position.

[0042] During this process, the sealing edge 112 and the pre-sealing edge 14 gradually recover from the pressure state. Under the elastic recovery of the pre-sealing edge 14, the mating end 141 re-maintains contact with the included angle between the concave column 4 and the lower sealing plate. The end of the panel 7 returns to the initial insertion position between the L-shaped swing frame 10 and the outwardly protruding crossbar A102.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A safety protection structure for a low-voltage switchgear, comprising a main frame (1), a sealing plate (2), connecting side plates (3), a panel (7), and a switchgear (8), characterized in that: The sealing plate (2) includes an upper sealing plate and a lower sealing plate respectively disposed at the upper and lower ends of the main frame (1), and the connecting side plate (3) is fixedly connected to the periphery of the upper sealing plate and the lower sealing plate; The upper surface of the lower sealing plate is connected to four concave columns (4) at the four corners. The concave columns (4) have hollow cavities. A support plate (5) is provided in the hollow cavity of the concave columns (4). The support plate (5) has hinged edges (51) on both sides. The hinged edges (51) are rotatably connected to the concave columns (4). An angle bracing side plate (6) is provided between the two concave columns (4), and the angle bracing side plate (6) is connected to the hinged edge (51); A reinforcing frame (31) is connected to the connecting side plate (3) located on the back side, and a pin connecting plate (32) is connected to the reinforcing frame (31). The panel (7) is connected to the pin connecting plate (32) by bolts, and the switch cabinet (8) is connected to the side of the panel (7) away from the pin connecting plate (32). The upper surface of the lower sealing plate is provided with a main hinge frame (9), and an L-shaped swing frame (10) and a transmission swing frame (11) are rotatably connected inside the main hinge frame (9). The lower end of the L-shaped swing frame (10) is provided with a hook bottom (101), the front end of the L-shaped swing frame (10) is provided with an outwardly protruding crossbar A (102), and the upper surface of the transmission swing frame (11) is provided with an outwardly protruding crossbar B (111).

2. The low-voltage switchgear safety protection structure according to claim 1, characterized in that, Both the protruding crossbar A (102) and the protruding crossbar B (111) are provided with covering holes (12), and a hollow part is formed between the L-shaped swing frame (10) and the protruding crossbar A (102) for inserting one end of the panel (7).

3. The low-voltage switchgear safety protection structure according to claim 2, characterized in that, A tension spring (13) is connected between the bottom (101) of the hook and the transmission swing frame (11). The front end of the transmission swing frame (11) is provided with a sealing edge (112). Both sides of the transmission swing frame (11) are provided with pre-tightening sealing edges (14). The end of the pre-tightening sealing edge (14) is provided with a fitting end (141). The fitting end (141) abuts against the angle between the concave column (4) and the lower sealing plate.

4. The low-voltage switchgear safety protection structure according to claim 3, characterized in that, The number of concave columns (4) is four, and the four concave columns (4) are respectively set at the four corners of the lower sealing plate. The two sides of the support plate (5) are respectively provided with two hinged edges (51) arranged at intervals. The hinged edges (51) are arranged along the length direction of the concave columns (4).

5. The low-voltage switchgear safety protection structure according to claim 1, characterized in that, The number of the corner bracing side plates (6) is two, and the two corner bracing side plates (6) are respectively arranged on opposite sides of the lower sealing plate, and each corner bracing side plate (6) is located between the corresponding two concave columns (4).

6. The low-voltage switchgear safety protection structure according to claim 5, characterized in that, The corner brace side plate (6) has an inner arc surface facing the inside of the main frame (1), and a sandwich layer is provided in the inner arc surface. A wave-shaped support plate (61) is connected in the sandwich layer. The wave-shaped support plate (61) is arranged along the extension direction of the corner brace side plate (6).

7. The low-voltage switchgear safety protection structure according to claim 1, characterized in that, The reinforcing frame (31) is connected to the side surface of the back connecting side plate (3) facing the interior of the main frame (1), and the pin connecting plate (32) is connected to the side of the reinforcing frame (31) facing the panel (7).

8. The low-voltage switchgear safety protection structure according to claim 1, characterized in that, The main hinge frame (9) has two opposing inner walls, and the two inner walls are provided with shaft holes for mounting the L-shaped swing frame (10) and the transmission swing frame (11).

9. A low-voltage switchgear safety protection structure according to claim 8, characterized in that, The transmission swing frame (11) is provided with a through hole, and one end of the tension spring (13) is connected to the bottom of the hook (101), and the other end is connected to the through hole.

10. A low-voltage switchgear safety protection structure according to claim 3, characterized in that, Both the sealing edge (112) and the pre-sealing edge (14) are elastic elements, and the fitting end (141) is located at the end of the pre-sealing edge (14) away from the transmission swing frame (11).

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