A bus duct for preventing loosening

Abstract

The present invention discloses a bus duct that prevents loosening, comprising a plurality of bus duct bodies, an electric plug is arranged on the bus duct body, an electric socket is arranged in the bus duct body, and the electric plug and the electric socket cooperate with each other to realize electrical connection; in particular, the electric plug is provided with a plug buckle facing the electric socket side, and an elastic member for resetting is arranged between the plug buckle and the electric plug; the bus duct body is provided with a plug buckle hole that cooperates with the plug buckle; when the electric plug is docked with the electric socket, the plug buckle and the plug buckle hole form a buckle connection. The present invention has the advantages of preventing the electric plug from falling off, ensuring effective connection of the line, and high safety.

Description

Technical Field

[0001] The invention relates to electrical appliance parts, in particular to a busbar duct which is prevented from loosening. Background Art

[0002] Modern high-rise buildings and large workshops require huge amounts of electrical energy, and in the face of this huge load, the powerful current of hundreds or thousands of amperes requires reliable conduction equipment, and the busbar system is a good choice. The busbar system is a power distribution device that efficiently transmits current, especially suitable for the economical and reasonable wiring needs of increasingly tall buildings and large-scale factories.

[0003] At present, bus ducts are generally used in areas several meters above the ground. When the bus duct is deformed by heat or the device shakes, the electrical plugs installed in the electrical sockets in the bus duct are easily loosened, causing the line connection to fail and affecting the normal production of the workshop.

[0004] Therefore, it is necessary to improve the existing bus duct. Summary of the invention

[0005] The object of the present invention is to provide a bus duct structure which can prevent an electric plug from falling off and ensure effective connection of lines.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A bus duct that prevents loosening comprises a plurality of bus duct bodies. An electric plug is arranged on the bus duct body, and an electric socket is arranged in the bus duct body. The electric plug and the electric socket cooperate with each other to realize electrical connection. In particular, the electric plug is provided with a plug buckle facing the electric socket side, and an elastic member for resetting is arranged between the plug buckle and the electric plug. The bus duct body is provided with a plug buckle hole that cooperates with the plug buckle. When the electric plug is docked with the electric socket, the plug buckle and the plug buckle hole form a buckle connection.

[0008] The principle of the present invention is as follows:

[0009] This bus duct adopts a segmented design, and the length of each section of the bus duct can be determined according to the actual needs of the user. By setting a plug buckle on the electric plug, the electric plug can be snap-connected with the bus duct body, so that the electric plug and the bus duct body are tightly connected. Compared with the traditional electric plug and electric socket matching design, even if the bus duct falls from a height of several meters, the electric plug can still maintain an effective connection with the electric socket, which greatly ensures the reliability of the line. And through the design of the elastic part, the user can force the plug buckle to move to one side of the electric plug, so that the plug buckle is disengaged from the plug buckle hole, and then the electric plug is pulled out. At the same time, based on the design of the elastic part, after the electric plug is pulled out of the electric socket, the plug buckle is reset under the action of the elastic part.

[0010] To ensure that the connection between the plug buckle and the plug buckle hole is effective, the plug buckle may include a buckle body, and the buckle body extends toward one side of the electrical socket away from the electrical plug to form a buckle block, and the buckle block is provided with a guiding inclined surface for guiding the buckle body to buckle into the plug buckle hole; the buckle block passes through the plug buckle hole and abuts against the bus duct body.

[0011] In order to ensure the safety of the bus duct, the electric plug is provided with a wire pin connected to the power supply and a ground pin connected to the ground wire, and the height of the ground pin is higher than the height of the wire pin. In this way, when the electric plug is inserted into or unplugged from the electric socket, the ground pin and the electric socket will always be connected earlier (inserted) / later (unplugged) than the wire pin and the electric socket, so that the electric plug is always grounded during the power-on process. Secondly, a grounding female terminal for connecting the ground pin is provided in the electric socket, and a grounding spring sheet extends from one side of the grounding female terminal close to the inner wall of the bus duct body; when the ground pin is inserted into the grounding female terminal, the grounding spring sheet abuts against the inner wall of the bus duct body to form a ground. Through the grounding design of the electric socket, the bus duct realizes an internal grounding design. Combined with the external wire grounding design outside the bus duct, the bus duct can realize a double grounding insurance design, which effectively ensures the grounding connection of the electric plug during the power-on process.

[0012] When the bus duct is in use, in order to monitor and control the line status, one of the wires located in the bus duct can be selected as a signal transmission line. Since the surface of the wire pins is generally plated with a coating, the coating is easily oxidized in a high temperature environment for a long time, resulting in poor contact between the electric plug and the electric socket, affecting signal transmission. In this regard, a wire socket clip that matches the wire used for signal transmission can be provided in the electric socket. The wire socket clip includes two clip plates for clipping the wire pins. The two clip plates are arranged oppositely, and the inner wall of at least one clip plate is provided with a plurality of protrusions. In this way, after the wire pin corresponding to the wire used for signal transmission is inserted into the wire socket clip, the protrusions arranged on the inner wall of the clip plate can cut the coating on the surface of the wire pin, so that the clip plate can be directly connected to the inner metal layer of the wire pin, ensuring the stability of signal transmission and avoiding the situation where signal transmission fails due to poor contact.

[0013] This bus duct adopts a segmented design, and the length of each bus duct can be several meters long. In order to ensure the effective connection of adjacent bus ducts, the bus duct body is provided with a connection hole for buckling the bus duct connection seat; a bus duct connection seat can be embedded between adjacent bus duct bodies, and the bus duct connection seat includes a connection male seat and a connection female seat with a split design; the connection male seat is provided with a number of plug-in male terminals, the connection male seat is provided with a male seat buckle block, the connection female seat is provided with a number of plug-in female terminals that match the plug-in male terminals, and the connection female seat is provided with a female seat buckle block. The male seat buckle block and the female seat buckle block are both placed in the connection hole and can slide along the axial direction of the bus duct body, and the male seat buckle block and the female seat buckle block are respectively buckled and connected with the connection hole.

[0014] The male and female connection seats of each bus duct connection seat are embedded in the interior of the bus duct body, so that there is sufficient support between the interconnected bus ducts. Because the buckle blocks of the male and female connection seats are slidably connected to the connecting holes of the bus duct body, when the bus duct body is heated and the adjacent bus duct bodies expand to each other, the adjacent bus duct bodies can move away from each other for a distance and at the same time ensure that the buckle blocks of the bus duct connection seat are still buckled in the corresponding connecting holes, so that the adjacent bus duct bodies remain connected and failure of the connection is avoided.

[0015] This bus duct connector adopts a split design, and the male connector and the female connector are respectively embedded in the corresponding bus duct body, which is convenient for line connection. In order to ensure the effective connection between the male connector and the female connector, an embedding chamber is provided in the male connector, and the male plug-in terminal is arranged at the bottom of the embedding chamber; the female connector is provided with an embedding block embedded in the embedding chamber, and the female plug-in terminal is arranged in the embedding block and penetrates the embedding block along the axial direction of the male plug-in terminal. The embedding block and the female connector are of an integrated design, and the embedding block is embedded in the embedding chamber, which can make the connection between the male connector and the female connector tighter. After the male plug-in terminal is inserted into the female plug-in terminal, the connection between the two will not fail, avoiding line failure caused by poor connection between the male connector and the female connector, and safety hazards caused by line heating. In addition, the plug-in female terminal may include a port block for wrapping the plug-in male terminal, the port block is surrounded by a plurality of elastic electrical contact sheets, and gaps are provided between adjacent elastic electrical contact sheets; in a non-plugged state, the inner diameter of the port block is smaller than the outer diameter of the plug-in male terminal; when the plug-in male terminal and the plug-in female terminal are docked with each other, the plug-in male terminal will elastically push away the elastic electrical contact sheets in the docked port block circumferentially to form an elastic interference fit, which can further ensure that the connection between the plug-in male terminal and the plug-in female terminal is effective.

[0016] Elastic sheets can also be provided on the two opposite outer side walls of the engaging block, and an elastic sheet groove is provided on the side wall of the engaging chamber corresponding to the outer side wall position of the engaging block provided with the elastic sheet. The male seat buckle block is provided on the side wall where the elastic sheet groove is located and is connected to the inside of the elastic sheet groove; a raised edge is also formed on the elastic sheet; when the connecting female seat and the connecting male seat are inserted into each other, the elastic sheet is placed in the elastic sheet groove and is elastically squeezed by the male seat buckle block, and the raised edge of the elastic sheet abuts against the male seat buckle block. In this way, the connecting male seat and the connecting female seat are fixed to each other through the elastic interference fit of the elastic sheet and the elastic sheet groove, and the assembly is very convenient.

[0017] In order to ensure the sealing of the bus duct, the bus duct body is composed of a wire duct shell and an upper cover plate. The wire duct shell includes a bottom panel and two side panels arranged perpendicular to the bottom panel. Both side panels are provided with cover plate plug-in slots extending to the inner side of the wire duct shell; the two sides of the upper cover plate are embedded in the cover plate plug-in slots for fixing. In actual production, the bus duct body will be several meters long. The length of the upper cover plate is too long and it is not conducive to workers to assemble the bus duct. For this reason, the cover plate plug-in slot may include an upper trough eaves and a lower trough eaves. The length of the lower trough eaves extending toward the inner side of the wire duct shell is greater than the upper trough eaves; the upper cover plate may include an upper cover plate body and a plug-in portion located on both sides of the upper cover plate body and having a thickness less than that of the upper cover plate body; the edge of the plug-in portion facing the wire duct shell side is an arc surface; the plug-in portion is embedded in the cover plate plug-in slot for installation.

[0018] When the bus duct is used in an environment with a very high ambient temperature, if the wires come into contact with the bus duct, the insulation layer of the wires may melt, which undoubtedly poses a safety hazard. To this end, a wiring block can be provided in the bus duct body of the bus duct to allow the internal wires to be suspended in the bus duct body, and the wiring block is made of high temperature resistant insulating material.

[0019] The invention has the advantages of preventing the electric plug from falling off, ensuring effective connection of the circuit, and having high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a bus duct in an embodiment of the present invention;

[0021] Figure 2 is a cross-sectional schematic diagram of a bus duct in an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 A partial enlarged view of middle A;

[0023] Figure 4 yes Figure 3 A partial enlarged view of B in the middle;

[0024] Figure 5 is a schematic diagram of a bus duct body in an embodiment of the present invention;

[0025] Figure 6 yes Figure 5 A partial enlarged view of middle C;

[0026] Figure 7 Schematic diagram of a bus duct connection seat in an embodiment of the present invention;

[0027] Figure 8 is a schematic diagram of a connection male socket in an embodiment of the present invention;

[0028] Fig. 9 Schematic diagram of connecting the female socket in an embodiment of the present invention;

[0029] Fig.10 yes Fig. 9 A partial enlarged view of D in the middle;

[0030] Fig.11 is a schematic diagram of the cooperation between an electric plug and an electric socket in an embodiment of the present invention;

[0031] Fig.12 is a schematic diagram of an electric plug in an embodiment of the present invention;

[0032] Fig.13 is a schematic diagram of an electrical socket according to an embodiment of the present invention;

[0033] Fig.14 Schematic diagram of a clip sheet in an embodiment of the present invention.

[0034] Description of reference numerals: 1-bus duct body; 2-duct shell; 3-upper cover; 4-bottom panel; 5-side panel; 6-connection hole; 7-cover plug-in slot; 8-upper duct eaves; 9-lower duct eaves; 10-upper cover body; 11-plug-in portion; 12-arc-shaped surface; 13-bus duct connection seat; 14-connection male seat; 15-connection female seat; 16-embedded chamber; 17-plug-in male terminal; 18-guide groove; 19-spring slot; 20-male seat buckle block; 21-connection female seat body; 22 - female socket snap-on block; 23 - fitting block; 24 - guide strip; 25 - spring sheet; 26 - raised edge; 27 - female plug-in terminal; 28 - elastic electrical contact piece; 29 - gap; 30 - electric plug; 31 - electric socket; 32 - plug snap; 33 - snap body; 34 - snap-on block; 35 - spring; 36 - plug snap hole; 37 - wire pin; 38 - ground pin; 39 - socket body; 40 - mounting hole; 41 - grounding spring sheet; 42 - clip sheet; 43 - bump; 44 - wiring block. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] like Figures 1 to 14 The bus duct shown is composed of a plurality of sections of aluminum bus duct bodies 1, each of which is composed of a wire duct shell 2 and an upper cover plate 3. The wire duct shell 2 includes a bottom panel 4 and two side panels 5 arranged perpendicular to the bottom panel 4. The two side panels 5 are provided with connection holes 6, which are respectively located at both ends of the side panels 5. In addition, the two side panels 5 are provided with a cover plate plug-in slot 7 extending toward the inner side of the wire duct shell 2, and the cover plate plug-in slot 7 includes an upper slot eave 8 and a lower slot eave 9, and the length of the lower slot eave 9 extending toward the inner side of the wire duct shell 2 is greater than the upper slot eave 8; the upper cover plate 3 includes an upper cover plate body 10 and a plug-in portion 11 located on both sides of the upper cover plate body 10 and having a thickness less than that of the upper cover plate body 10; the edge of the plug-in portion 11 facing the wire duct shell 2 is an arc surface 12; the plug-in portion 11 is embedded in the plug-in slot for installation and fixation.

[0037] Adjacent bus duct bodies 1 are connected and fixed by a bus duct connection seat 13 embedded in the bus duct body 1. The bus duct connection seat 13 is composed of a connection male seat 14 and a connection female seat 15. The connection male seat 14 and the connection female seat 15 are split designs.

[0038] The outer contour of the connecting male seat 14 matches the interior of the wire slot shell 2. The connecting male seat 14 is provided with an embedding chamber 16 with a square cross-section. One end of the embedding chamber 16 is open. Four plug-in male terminals 17 arranged side by side are provided at the bottom of the embedding chamber 16 opposite to the opening. At the same time, two mutually parallel guide grooves 18 are formed on the top inner wall of the embedding chamber 16. Shrapnel grooves 19 are provided on the inner walls on the left and right sides of the embedding chamber 16. The bottom of the shrapnel groove 19 is connected to the outside of the connecting male seat 14, and a male seat buckle block 20 is provided in the hole where the shrapnel groove 19 is connected to the outside of the connecting male seat 14. The male seat buckle block 20 can be buckled into the connecting hole 6 of the wire slot shell 2, buckled with the connecting hole 6 and axially slide along the busbar trunking body 1;

[0039] The connecting female seat 15 includes a connecting female seat body 21 whose outer contour matches the interior of the wire trough shell 2, and a female seat buckle block 22 is provided on the connecting female seat body 21, and the female seat buckle block 22 can be buckled into the connecting hole 6 of the wire trough shell 2, buckled with the connecting hole 6 and slide axially along the bus trough body 1; the connecting female seat body 21 extends toward one side of the connecting male seat 14 to form an engaging block 23 that can be embedded in the embedding chamber 16, and a guide strip 24 that matches the guide groove 18 is provided on the top of the engaging block 23, and spring pieces 25 are provided on the two opposite outer side walls of the embedding block 23, and the outer side wall where the spring piece 25 is located corresponds to the side wall position of the embedding chamber 16 where the spring piece 25 groove 19 is provided, and a raised edge 26 is formed on the spring piece 25; when the connecting female seat 15 and the connecting male seat 14 are inserted into each other, the spring piece 25 is placed in the spring piece 25 groove 19 and is buckled by the male seat. The block 20 is elastically squeezed, and the raised edge 26 of the spring 25 abuts against the male seat buckle block 20; a plurality of plug-in female terminals 27 matching the plug-in male terminal 17 are also provided in the connecting female seat 15, and the plug-in female terminal 27 is arranged in the connecting female seat 15 and penetrates the engaging block 23 and the connecting female seat body 21 along the axial direction of the plug-in male terminal 17, and the plug-in female terminal 27 includes a port block for wrapping the plug-in male terminal 17, and the port block is surrounded by a plurality of elastic electrical contact sheets 28, and a gap 29 is provided between adjacent elastic electrical contact sheets 28; in the non-plugged state, the inner diameter of the port block is smaller than the outer diameter of the plug-in male terminal 17; when the plug-in male terminal 17 and the plug-in female terminal 27 are docked with each other, the plug-in male terminal 17 will elastically push away the elastic electrical contact sheet 28 in the port block docked with it circumferentially to form an elastic interference fit.

[0040] like Figure 1As shown, the bus duct body 1 is provided with an electric plug 30, and the bus duct body 1 is provided with an electric socket 31, and the electric plug 30 and the electric socket 31 cooperate with each other to achieve electrical connection. The electric plug 30 is provided with a plug buckle 32 facing the side of the electric socket 31, and the plug buckle 32 includes a buckle body 33, and the buckle body 33 extends from the side of the electric socket 31 to the direction away from the electric plug 30 to form a buckle block 34, and the buckle block 34 is provided with a guide inclined surface for guiding the buckle body 33 to buckle into the plug buckle hole 36. The buckle block 34 buckles into the plug buckle hole 36 and abuts against the bus duct body 1, and an elastic member for resetting, i.e., a spring 35, is provided between the buckle body 33 and the electric plug 30. The bottom of the wire duct shell 2, i.e., the bottom of the bus duct body 1, is provided with a plug buckle hole 36 that cooperates with the plug buckle 32. When the electric plug 30 is connected to the electric socket 31, the plug buckle 32 and the plug buckle hole 36 form a buckle connection, so that the electric plug 30 is tightly connected to the bus duct body 1. Through the design of the spring 35, the user can force the buckle body 33 together with the buckle block 34 to move to the side of the electric plug 30, so that the buckle block 34 is separated from the plug buckle hole 36, thereby pulling out the electric plug 30. At the same time, based on the design of the spring 35, after the electric plug 30 is pulled out of the electric socket 31, the plug buckle 32 is reset under the action of the spring 35.

[0041] The electric plug 30 is provided with a wire pin 37 connected to the power source and a ground wire pin 38 connected to the ground wire. In this embodiment, the electric plug 30 is a three-phase four-wire plug, so the number of the wire pins 37 is 4. Fig.12 As shown, the height of the ground pin 38 of the electric plug 30 is higher than the height of the electric wire pin 37. In this way, when the electric plug 30 is inserted into or pulled out of the electric socket 31, the electric plug 30 is always grounded.

[0042] like Fig.13 As shown, the electrical socket 31 includes a seat body 39, and the seat body 39 is provided with 5 mounting holes 40, and each mounting hole 40 is respectively installed with 4 wire socket clips and 1 grounding socket clip as a grounding female terminal, wherein the mounting hole 40 with the grounding socket clip is opened on the side and the opening faces the inner wall of the bus duct body 1, and the grounding socket clip installed therein extends toward one side of the opening to form a grounding spring 41, and the grounding spring 41 is close to the side wall of the wire duct shell 2. When the ground wire pin 38 is inserted into the grounding female terminal, the grounding spring 41 abuts against the side wall of the wire duct shell 2 to form grounding, thereby realizing internal grounding of the bus duct. In addition, outside the bus duct body 1, adjacent bus duct bodies 1 are electrically connected through wires to realize external grounding of the bus duct, thereby realizing a double grounding insurance design.

[0043] When the bus duct is in use, in order to monitor and control the line status, the user generally selects one of the wires in the bus duct as the signal transmission line, such as Fig.14As shown, the wire socket clip installed in the mounting hole 40 and corresponding to the wire for signal transmission includes two clipping pieces 42 for clipping the wire pins 37. The two clipping pieces 42 are arranged opposite to each other, and the inner wall of at least one clipping piece 42 is provided with a plurality of protrusions 43. In this way, after the wire pins 37 corresponding to the wire for signal transmission are inserted into the wire socket clip, the protrusions 43 arranged on the inner wall of the clipping piece 42 can cut the coating on the surface of the wire pins 37, so that the clipping piece 42 can be directly connected with the inner metal layer of the wire pins 37, thereby ensuring the stability of signal transmission and avoiding the situation where the signal transmission fails due to poor contact.

[0044] like Figure 2 As shown, the bus duct body 1 of the present bus duct is also provided with a wiring block 44 that allows the internal wires to be suspended in the bus duct body 1. The wiring block 44 is made of high temperature resistant insulating material, thereby avoiding direct contact between the wires and the bus duct.

[0045] This specification lists only the preferred embodiments of the present invention. All equivalent technical changes made under the working principle and concept of the present invention are deemed to be within the protection scope of the present invention.

Claims

1. A bus duct that prevents loosening, comprising a plurality of bus duct bodies, wherein the bus duct bodies are provided with an electrical plug, and the bus duct bodies are provided with an electrical socket, wherein the electrical plug and the electrical socket cooperate with each other to realize electrical connection; characterized in that: The electric plug is provided with a plug buckle facing the side of the electric socket, and an elastic member for resetting is provided between the plug buckle and the electric plug; the bus duct body is provided with a plug buckle hole that cooperates with the plug buckle; when the electric plug is docked with the electric socket, the plug buckle and the plug buckle hole form a buckle connection; the bus duct body is provided with a connecting hole for buckling the bus duct connecting seat; a bus duct connecting seat is embedded between adjacent bus duct bodies, and the bus duct connecting seat includes a connecting male seat and a connecting female seat in a split design; the connecting male seat is provided with a number of A plurality of plug-in male terminals, a male seat buckle block is provided on the connecting male seat, a plurality of plug-in female terminals matching the plug-in male terminals are provided in the connecting female seat, a female seat buckle block is provided on the connecting female seat, the male seat buckle block and the female seat buckle block are both placed in the connecting hole and can slide axially along the bus duct body, the male seat buckle block and the female seat buckle block are respectively buckled and connected with the connecting hole; an embedding chamber is provided in the connecting male seat, and the plug-in male terminal is arranged at the bottom of the embedding chamber; an embedding block embedded in the embedding chamber is provided on the connecting female seat, The plug-in female terminal is arranged in the embedding block and penetrates the embedding block along the axial direction of the plug-in male terminal; spring sheets are arranged on the two opposite outer side walls of the embedding block, and the side wall of the embedding chamber corresponding to the outer side wall position of the embedding block with the spring sheet is provided with a spring sheet groove, and the male seat buckle block is arranged on the side wall where the spring sheet groove is located and is connected to the inside of the spring sheet groove; a raised edge is also formed on the spring sheet; when the connecting female seat and the connecting male seat are plugged into each other, the spring sheet is placed in the spring sheet groove and is elastically squeezed by the male seat buckle block, and the raised edge of the spring sheet abuts against the male seat buckle block On the buckle block; the connecting male seat and the connecting female seat are fixed to each other by the elastic interference fit of the spring sheet and the spring sheet groove; the plug-in female terminal includes a port block for wrapping the plug-in male terminal, and the port block is surrounded by a plurality of elastic electrical contact sheets, and a gap is provided between adjacent elastic electrical contact sheets; in the non-plugged state, the inner diameter of the port block is smaller than the outer diameter of the plug-in male terminal; when the plug-in male terminal and the plug-in female terminal are docked with each other, the plug-in male terminal will elastically push away the elastic electrical contact sheet in the port block docked with it circumferentially to form an elastic interference fit.

2. The anti-loosening bus duct according to claim 1, characterized in that: The plug buckle includes a buckle body, and a buckle block is formed on the side of the buckle body facing the electrical socket and extending away from the electrical plug. The buckle block is provided with a guiding inclined surface for guiding the buckle body to buckle into the plug buckle hole; the buckle block passes through the plug buckle hole and abuts against the bus duct body.

3. The anti-loosening bus duct according to claim 1, characterized in that: The electric plug is provided with an electric wire pin connected to a power source and a ground wire pin connected to a ground wire, and the height of the ground wire pin is higher than the height of the electric wire pin.

4. The anti-loosening bus duct according to claim 3, characterized in that: The electrical socket is provided with a grounding female terminal for connecting a ground wire pin, and a grounding spring sheet extends from one side of the grounding female terminal close to the inner wall of the bus trough body; when the ground wire pin is inserted into the grounding female terminal, the grounding spring sheet abuts against the inner wall of the bus trough body to form grounding.

5. The anti-loosening bus duct according to claim 3, characterized in that: The electrical socket is provided with a wire socket clip that matches the wires used for signal transmission. The wire socket clip includes two clip plates for clipping the pins of the electrical plug. The two clip plates are arranged opposite to each other, and the inner wall of at least one clip plate is provided with a plurality of protrusions.

6. The anti-loosening bus duct according to claim 1, characterized in that: The bus duct body is composed of a wire duct shell and an upper cover plate; the wire duct shell includes a bottom panel and two side panels arranged perpendicular to the bottom panel, and the two side panels are provided with a cover plate plug-in slot extending to the inner side of the wire duct shell; the cover plate plug-in slot includes an upper slot eaves and a lower slot eaves, and the length of the lower slot eaves extending toward the inner side of the wire duct shell is greater than that of the upper slot eaves; the upper cover plate includes an upper cover plate body and a plug-in part located on both sides of the upper cover plate body and having a thickness less than that of the upper cover plate body; the edge of the plug-in part facing the wire duct shell side is an arc surface; the plug-in part is embedded in the cover plate plug-in slot for installation.

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