CN108539550B

CN108539550B - Tapping device for power distribution and power distribution device

Info

Publication number: CN108539550B
Application number: CN201810148960.0A
Authority: CN
Inventors: 王红江
Original assignee: Kuoshuang Electric Shanghai Co ltd
Current assignee: Shanghai Falcon Electric Technology Co ltd
Priority date: 2018-02-13
Filing date: 2018-02-13
Publication date: 2023-05-05
Anticipated expiration: 2038-02-13
Also published as: CN108539550A

Abstract

The invention relates to the field of power connection systems, in particular to a power distribution device capable of providing power to a power socket. The tapping device for power distribution is used for being inserted into a power track to take power, wherein a live wire conductor, a zero wire conductor and a ground wire conductor are respectively arranged in the power track; the method is characterized in that: the tapping device comprises a tapping device, a power rail, a tapping device, a power rail and a tapping device, wherein the tapping device is characterized in that a lower base body of the tapping device is used for being inserted into the power rail to take power, the lower base body comprises a ground wire contact piece arranged along the axis of a base body rotating shaft and a rotating arm arranged at right angles to the ground wire contact piece, and two ends of the rotating arm are respectively provided with a live wire contact piece and a zero wire contact piece. The invention reasonably configures the structures of all parts, greatly reduces the volume and the opening width of the electric power rail, ensures that the longitudinal opening width of the electric power rail can reach the unprecedented narrow opening of 4 mm-5 mm, has more attractive appearance and improves the safety coefficient.

Description

Tapping device for power distribution and power distribution device

Technical Field

The invention relates to the field of power connection systems, in particular to a power distribution device capable of providing power to a power socket.

Background

With the popularization and application of intelligent control systems in all aspects of daily life of human beings, higher and higher requirements are also put on the existing decoration wiring forms. The traditional wiring form can not meet the wiring requirement of an intelligent control system, and the main reason is that the traditional decoration wiring form enables the positions of socket holes to be relatively fixed, if an electric appliance with a longer connection distance is required, a plurality of sockets must be led out from a wall socket by using a wiring board to be connected with an external electric appliance, and the power line of the wiring board is very disordered and has potential safety hazards; the arrangement of a plurality of socket holes in the common positions can complicate the wiring in the wall, and the arrangement positions of the socket holes in the wall are difficult to accurately predict when the wiring is decorated.

In order to adapt to the development of an intelligent control system, the conventional decoration wiring form is changed, the wiring technology and the power system are reasonably modified, and the intelligent control system gradually becomes an important development direction in the field of intelligent control.

For example, the application number is 201611175960.7, the invention is named as a sliding power supply distribution device and a socket with the power supply distribution device, and discloses a sliding power supply distribution device, which comprises a sliding rail and an electric connector, wherein three long conductors are respectively fixedly arranged in two side walls of a sliding groove of the sliding rail along the length direction of the sliding rail; the electric connector comprises a rotating arm, a conductive connector and a bottom shell. One end of the conductive connector is provided with three conductor contact pieces, the other end of the conductive connector is provided with three arc contact pieces, a plug of an external electric device penetrates through a power jack on the bottom shell to be in contact connection with the arc contact pieces, and the three arc contact pieces are respectively and electrically connected with the three conductor contact pieces. The electric connector is inserted in the sliding groove of the sliding rail, the electric connector is rotated, the conductor contact pieces fixed in the rotating arm are electrically connected with the three long conductor contacts, and when the plug of the external electric device is inserted into the electric connector, the plug, the arc-shaped contact pieces, the conductor contact pieces and the long conductors of the external electric device form a passage to supply power to the external electric device. Through the long conductor that sets up in the slide rail with the wall on socket electricity that has been equipped with be connected to can extend through the slide rail and arrange to suitable get electric point, electric connector slides along the slide rail, can put through the circuit in optional position, use more nimble. The technical scheme of the invention provides a more flexible and convenient wiring form, but because the part of the electric connector which needs to be inserted into the chute has a complex structure and large volume, the chute opening of the power distribution device is wider, the attractive appearance is affected, and the opening is too large, so that foreign matters are easy to enter, and a certain potential safety hazard exists.

As another example, patent application No. 200810173050.4 entitled "apparatus for distributing electrical power and/or communication signals" discloses a power distribution apparatus that includes a conduit having an opening and an electrical connector capable of being inserted into the opening and into the conduit. The electric connector is provided with a rotating arm at the part inserted into the guide pipe, electric contacts are arranged at two ends of the rotating arm, cylindrical live wire conductors and zero wire conductors are respectively arranged in grooves at two sides of the opening of the guide pipe, and a ground wire is arranged at the bottom of the guide pipe; the position of the conduit opposite to the opening is provided with a plurality of conductive elements made of metal, each conductive element is respectively and elastically supported, and when the electric connector is not inserted into the conduit, the conductive elements elastically bias the closed opening towards the opening; when the electric connector is inserted into the guide pipe and rotates, the electric contacts at the two ends of the rotating arm are respectively electrically connected with the live wire conductor and the zero wire conductor, and meanwhile, the conductive element pressed down by the electric connector is grounded to form a passage, so that electricity taking of the electric connector is completed, and power can be supplied to external electric devices. The power distribution device with the structure solves the problems that the track opening is too large, attractive and unsafe, but has complex structure, and the power distribution device uses a plurality of conductive elements which are elastically supported to seal the opening, thus having high cost and complex process.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art and provide a novel tapping device and a power distribution device for power distribution, which are flexible, convenient, attractive and safe.

The tapping device for power distribution is used for being inserted into a power track to take power, wherein a live wire conductor, a zero wire conductor and a ground wire conductor are respectively arranged in the power track; the method is characterized in that: the tapping device 14 comprises an upper socket 141 and a lower base body 143, the upper socket 141 is provided with a jack 1411 for inserting a plug of an external electric device, the lower base body 143 is used for being inserted into a power track to take power, the lower base body 143 comprises a ground wire contact 1431 arranged along the axis of a base body rotating shaft 18 and a rotating arm 144 arranged at right angles to the ground wire contact 1431, and both ends of the rotating arm 144 are respectively provided with a live wire contact 1441 and a neutral wire contact 1442; the receptacle 1411 of the upper receptacle 141 of the tap 14 connects the live contact 1441, the neutral contact 1442, and the ground contact 1431 through a plug assembly 142 disposed inside the tap 14.

Further, the ground contact 1431 of the tap 14 may be a U-shaped metal sheet; the U-shaped metal sheet is inlaid on the outer surface of the rotary shaft 18 of the base body, the bottom of the U-shaped metal sheet is arranged on the contact surface of the rotary shaft 18 and the ground wire conductor 9 at the bottom of the cavity 1, and the open end of the U-shaped metal sheet extends into the tap 14 and is connected with the plug-in assembly 142.

Further, the ground contact 1431 of the tap 14 may be a piston-type conductor disposed at the bottom end of the base rotary shaft 18; the conductor consists of a sleeve 19, and a spring 21 and a contact 20 which are arranged in the sleeve 19 in sequence from top to bottom, all are made of conductive materials, the sleeve 19 is nested in the rotating shaft 18, wherein the spring 21 is arranged between a sleeve base 191 and the contact 20, and the sleeve base 191 is connected with a plug-in assembly 142 inside the tapping device 14.

Further, an L-shaped live wire contact 1441 and a neutral wire contact 1442 are respectively provided on the rotating arm 144 of the tap 14; one end of the L-shaped live wire contact 1441 and the neutral wire contact 1442, which are exposed out of the rotating arm 14, is in an inserting structure, and the other end extends into the tap 14 to be connected with the inserting assembly 142.

Preferably, the tap 14 is further provided with a protective cover 145 at a position corresponding to the rotary arm 144.

Preferably, the tap further comprises a rotation limiting means.

The rotation limiting device is that two semicircular grooves 22 are formed in the bottom shell of the tapping device 14, a protruding structure 23 is respectively arranged on the protecting cover 145 along the tail end positions of the semicircular grooves 22, and the protruding structure 23 extends into the semicircular grooves 22; the protrusion 23 and the semicircular groove 22 cooperate to limit the rotational direction and end position of the rotating arm 144.

The tap further comprises echo means.

The echogenic feature is a paddle 24 disposed at the end of the semicircular channel 22, the paddle 24 generating a rattle upon impact with the raised structure 23 as the raised structure 23 enters or leaves the end of the semicircular channel 22.

A power distribution device comprising a tap for power distribution and a power track, characterized in that: the electric power rail is a closed structure with a longitudinal opening, and the closed structure is formed by connecting a plurality of integrally formed cavities; grooves are formed in the two side walls of the cavity along the longitudinal opening respectively and are used for installing live wire conductors and zero wire conductors respectively; a convex structure is arranged at the bottom of the cavity and faces the longitudinal opening to serve as a ground wire conductor; the width of the opening is 4 mm-5 mm;

the lower base body of the tapping device is used for being inserted into a longitudinal opening of the power rail, and a ground wire contact piece of the lower base body is tightly contacted with a ground wire conductor in the power rail; and the live wire contact pieces and the zero wire contact pieces at the two ends of the rotating arm of the lower base body are respectively in close contact with the live wire conductor and the zero wire conductor at the two side walls of the longitudinal opening of the power rail when the rotating arm rotates to the electrified position of the tapping device.

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

1. the power track and the tapping device have simple structure, can realize flexible power taking at any position, do not need to use a conductive element to elastically bias the closed opening towards the opening, save the cost and lead the assembly to be simpler and more efficient.

2. The invention reasonably configures the structures of all parts, greatly reduces the volume and the opening width of the electric power rail, ensures that the longitudinal opening width of the electric power rail can reach the unprecedented narrow opening of 4 mm-5 mm, has more attractive appearance and improves the safety coefficient.

Drawings

FIG. 1 (a) is a schematic diagram of power distribution using a power track according to a preferred embodiment of the present invention

FIG. 1 (b) is a schematic diagram of the cavity structure of the power rail of FIG. 1 (a)

FIG. 1 (c) is a schematic cross-sectional view of a cavity of the power rail of FIG. 1 (a)

FIG. 2 is a schematic cross-sectional view of the cavity of FIG. 1 (c) with live, neutral, and ground conductors mounted therein

FIG. 3 (a) is a schematic diagram of the structure of the live or neutral conductor

FIG. 3 (b) is an enlarged partial schematic view of the locating reinforcing structure of the live or neutral conductor of FIG. 3 (a)

Fig. 4 is a schematic diagram of an insulator configuration for a live or neutral conductor

FIG. 5 (a) is a schematic view of the structure of a ground conductor

FIG. 5 (b) is an enlarged partial schematic view of the positioning reinforcement structure of the ground wire conductor shown in FIG. 5 (a)

FIG. 6 is a schematic diagram of a weak current converter on a power rail

FIG. 7 (a) is a schematic front view of a tap

FIG. 7 (b) is a schematic view of the back side of the tap

FIG. 7 (c) is a schematic view of the internal structure of the tap

FIG. 8 (a) is a schematic perspective view of the lower body of the tap

FIG. 8 (b) is a front view of the lower body of the tap

FIG. 9 is a schematic view of a protective cover of the tap changer extension body

FIG. 10 (a) is a schematic perspective view of a U-shaped metal sheet

FIG. 10 (b) is a schematic view of the structure of the tap ground contact formed from the U-shaped metal foil of FIG. 10 (a)

FIG. 10 (c) is a schematic view of the ground contact of FIG. 10 (b) inserted into a cavity

FIG. 11 (a) is a schematic view of a structure of a grounding contact of a tap constructed by a piston-type electrical conductor

FIG. 11 (b) is a schematic view of the ground contact of FIG. 11 (a) inserted into a cavity

FIG. 12 is a schematic view of a rotational stop and echo device of the tap

In the figure:

1-cavity, 2-longitudinal opening, 3-side cover, 4-mounting groove for mounting lighting lamp strip, 41-lamp strip buckle, 5-groove for mounting protective strip, 51-protective strip, 6-clamping groove, 7-groove for mounting live wire conductor, 8-groove for mounting neutral wire conductor, 71-live wire conductor, 81-neutral wire conductor, 9-ground wire, 10-positioning reinforcement structure at edge of live wire or neutral wire opening, 101-opening, 11-foil, positioning reinforcement structure on 12-ground wire conductor, 121-opening, insulator outside 13-live wire or neutral wire conductor, 14-tap, 141-upper socket, 1411-jack, 142-plug assembly, 143-lower base, 1431-ground wire contact, 144-rotating arm, 1441-live wire contact, 1442-neutral wire contact, 145-protective cover, 15-weak current transducer, 17-U-foil, 18-base rotating shaft, 19-sleeve, 191-sleeve base, 20-contact, 21-spring, 22-groove, 23-tab, 24-tab structure.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples.

Referring to fig. 1 (a) and 1 (b), the electric rail of the present embodiment is a closed structure with a longitudinal opening 2 formed by integrally formed cavities 1, and several cavities 1 can be connected according to a required installation length, and closed by using side covers 3 on both left and right sides. The power rail is connected with a power supply through a power connector, and after the tapping device 14 is inserted into any position in the longitudinal opening 2 of the power rail, the live wire conductor 71, the zero wire conductor 81 and the ground wire conductor 9 in the power rail are connected for safe power taking at the position. The longitudinal opening 2 of the power rail of this embodiment has a width of only 4.5mm, which is slightly larger than the outer peripheral dimension of the portion of the tap 14 inserted into the longitudinal opening 2, ensuring that no misalignment occurs when the tap 14 is inserted into the power rail. In this way, the minimum space requirement of the parts of the tap 14 which are inserted into the power rail and connected with the live wire conductor 71, the neutral wire conductor 81 and the ground wire conductor 9 in the power rail can be met, the longitudinal opening 2 can be kept at the minimum required width, the proportion of the internal structure of the power rail exposed to the outside is reduced as much as possible, and the risk of electric shock caused by the fact that foreign objects extend into the power rail is avoided as much as possible.

In the embodiment, the bottom of the electric power track is also longitudinally provided with a mounting groove 4 for mounting the illuminating lamp belt. The lighting lamp belt is directly arranged in the mounting groove 4, and the power supply circuit is connected with the inner conductor of the cavity 1; a lamp strip buckle 41 is additionally provided, which buckle 41 can be directly clamped into a chute provided on the mounting groove 4. The lamp belt switch can adopt an induction type or a reciprocating button type. When the induction type lamp is adopted, the human body induction is directly utilized to control the lamp belt switch. When the reciprocating button switch is adopted, the button switch is also clamped into the mounting groove by the sliding groove, and the reciprocating button can control the lamp belt switch.

Referring to fig. 1 (c), 7 is a groove for installing the

live wire conductor

71, 8 is a groove for installing the

neutral wire conductor

81, 6 is a clamping groove for installing the

ground wire conductor

9, 5 is a groove for installing the protection adhesive tape 51, the longitudinal opening 2 is further shielded by the protection adhesive tape 51, and the aesthetic degree and the safety of preventing foreign matters from entering the inside of the track are further improved.

Referring to fig. 2, fig. 2 shows a mold cavity in which a live conductor 71, a neutral conductor 81, a ground conductor 9, and a protective tape 51 are installed as shown in fig. 1 (c). As shown in fig. 3 (a), the live wire conductor 71 and the neutral wire conductor 81 are elongated elastic conductors, the cross section of each of the live wire conductor 71 and the neutral wire conductor 81 is U-shaped, and the installation directions of the live wire conductor 71 and the neutral wire conductor 81 in the

recesses

7 and 8 of the cavity 1 are as follows: the opening direction is consistent with the notch direction of the

grooves

7, 8, so the cavity 1 of the present embodiment is made of metal, and the outside of the portion of the live conductor 71 installed between the grooves 7 and the outside of the portion of the neutral conductor 81 installed between the grooves 8 are covered with the insulator 13 as shown in fig. 4 for isolation.

Referring to fig. 3 (b) in combination, a plurality of openings 101 may be provided in parallel at the opening edges of the live conductor 71 and the neutral conductor 81 to form a tooth-like structure, similar to the tooth-like structure on a slide fastener, to form the positioning reinforcing structure 10 with a rugged surface. With this structure, the live wire contact 1441 and the neutral wire contact 1442 of the disconnector 14 are fixed laterally relative to each other after being inserted into the elastic conductor openings of the live wire conductor 71 and the neutral wire conductor 81. The same effect can be achieved by using a positioning reinforcing structure with a wavy surface to form a convex-concave shape.

Referring to fig. 5 (a) and 5 (b) in combination, the ground conductor is a resilient metal sheet 11 of a semi-cylindrical protruding structure, the protruding portion of which is directed in the direction of the longitudinal opening 2 of the mould cavity 1. The ground conductor may be realized in two forms: the first form is: the ground wire conductor formed by the elastic metal sheet 11 with the structure is independently arranged in the cavity 1, meanwhile, clamping grooves 6 are arranged at two sides of the position of the cavity 1, where the ground wire conductor needs to be arranged, and the metal sheet 11 can be inserted into the grooves for fixation; the second form is: when the cavity 1 is made of conductive material, a protruding structure is integrally formed on the cavity 1 as a ground conductor. In this embodiment, the first form is employed. Meanwhile, in the case of the first form, the surface of the elastic metal piece 11 constituting the ground wire conductor may be provided with a plurality of openings 121 in parallel, forming the positioning reinforcing structure 12 having surface irregularities. With this structure as well, the ground contact 1431 of the sub-connector 14 is made to function as a longitudinal relative fixation of the sub-connector 14 after being brought into close contact with the ground conductor.

The electric power rail is also provided with a weak current converter 15, and the weak current converter 15 is composed of a weak current cavity, different weak current conversion modules and corresponding weak current module mounting plates. The weak current conversion module is connected to a weak current source circuit through a connecting piece, and electricity is taken through a weak current conversion interface on the weak current converter 15. As shown in fig. 6, the weak current conversion module is separately provided on the other cavity and is fixed to the end of the power rail cavity by a connector. The weak current conversion module is directly fixed on a weak current module mounting plate, and the mounting plate is fixed on a weak current converter 15 cavity. Each weak current converter 15 is provided with a connecting piece which can be inserted into the screw hole of the end cover of the power rail cavity 1, and one or more converters can be inserted into the rail cavity in parallel according to requirements.

Referring to fig. 7 (a), 7 (b), 7 (c), 8 (a) and 8 (b), the tap 14 is used for being inserted into any position of the power track to provide flexible and convenient power taking port for external electric devices, the tap 14 is composed of an upper socket 141 and a lower base 143, a jack 1411 is arranged on the upper socket 141 for inserting a plug of the external electric device for power taking, the lower base 143 comprises a ground wire contact 1431 linearly arranged along a base rotation shaft and a rotating arm 144 arranged at right angles to the ground wire contact 1431, and two ends of the rotating arm 144 are respectively provided with a live wire contact 1441 and a neutral wire contact 1442. The receptacle 1411 forms a power extraction path with the ground contact 1431, the live contact 1441, and the neutral contact 1442 via the plug assembly 142.

The lower base body 143 of the tapping device 14 is inserted into the power track, the ground wire contact 1431 is contacted with the ground wire conductor 9 in the cavity 1, the contacts at the two ends of the rotary tapping device 14 to the rotary arm 144 are respectively contacted with the live wire conductor 71 and the neutral wire conductor 81 in the power track, and at the moment, the plugging assembly 142 in the upper socket of the tapping device 14 is electrically connected with the live wire conductor 71, the neutral wire conductor 81 and the ground wire 9 in the cavity 1 through the live wire contact 1441, the neutral wire contact 1442 and the ground wire contact 1431 to form a power taking path.

An L-shaped live wire contact 1441 and a neutral wire contact 1442 are provided in the rotary arm 144 of the tap 14; the front ends of the straight extensions are connected to the plug assemblies 142 inside the tap 14, respectively, and the ends are provided with a 90-degree turn, and the turned portions are of a plug-in type structure which faces the live conductor 71 and the neutral conductor 81 in the cavity 1, respectively. When tap 14 is inserted into cavity 1 and rotated clockwise, the tab structures on live contact 1441 and neutral contact 1442 will rotate to extend into the U-shaped openings of live conductor 71 and neutral conductor 81, respectively, to connect the cavity conductors to the tap conductors. The live wire contact 1441 and the neutral wire contact 1442 are each surrounded by an insulator except for the sheet structure.

Referring to fig. 9, the lower body of the tap 14 is further provided with a protective cover 145 at a position corresponding to the rotary arm 144 for accommodating the rotary arm 144 in the inactive state. The protective cover 145 is shaped and configured to be inserted into the longitudinal opening 2 of the cavity 1 and to remain in place when the tap 14 is rotated.

As shown in fig. 10 (a), the ground contact 1431 of the tap 14 may be a U-shaped metal sheet. See fig. 10 (b), 10 (c); the U-shaped metal sheet is inlaid on the outer surface of the rotary shaft 18 of the lower base body of the tapping device 14 by adopting an integral injection molding process, the rotary shaft 18 is made of plastic, the bottom of the U-shaped metal sheet is arranged on the contact surface of the rotary shaft 18 and the ground wire conductor 9 at the bottom of the cavity 1, and the open end extends into the tapping device 14 to be connected with the plugging component 142. The ground wire conductor structure of the power rail optimally matched with the ground wire contact piece of the structure is a structure of an elastic metal sheet adopting a semicircular column type protruding structure, and a plurality of parallel openings 121 are arranged on the surface of the elastic metal sheet to form a positioning reinforcing structure 12 with uneven surface. The U-shaped metal sheet can meet the use requirement of tight contact when being matched with the ground wire conductor with certain elasticity.

Referring to fig. 11 (a) and 11 (b), the ground contact 1431 of the tap 14 may employ a piston type conductor disposed at the bottom end of the base rotary shaft 18; the conductor consists of a sleeve 19, and a spring 21 and a contact 20 which are arranged in the sleeve 19 in sequence from top to bottom, all are made of conductive materials, the sleeve 19 is nested in the rotating shaft 18, wherein the spring 21 is arranged between a sleeve base 191 and the contact 20, and the sleeve base 191 is connected with a plug-in assembly 142 inside the tapping device 14. The ground wire conductor structure of the power rail optimally matched with the ground wire contact piece of the structure is a structure that a bulge is formed on a cavity in an integrated mode, and the piston type conductor has good elasticity and can meet the use requirement of tight contact when matched with the ground wire conductor of the structure.

Referring to fig. 12, a schematic view of the tap rotation limit and echo device is shown.

Two semicircular grooves 22 are provided on the bottom shell of the tap 14, and a projection 23 is provided on the protective cover 18 at the end of the semicircular grooves, which projection 23 projects into the semicircular groove 22. When the tap 14 is inserted into the mould cavity 1, the tap 14 can only rotate clockwise along the annular groove due to the limitation of the groove 22 and the protruding structure 23, and the protruding structure 23 reaches the end of the closed groove 22 at the moment when rotating to 90 degrees, so that the rotational positioning of the tap 14 is realized.

The echo device is a pokable arc poking rod arranged at the tail end of the semicircular groove 22 as a poking piece 24, and the poking piece 24 is sleeved on a stand column on the base body to be fixed and poked appropriately. The position of the structure corresponds to the end position of the semicircular groove 22, and the end portion protrudes to the position where the groove 22 is located. When the tap 14 is inserted into the power track and rotated clockwise to 90 degrees, the lugs 23 enter or leave the end positions of the semicircular grooves 22, and the paddles 24 collide with the lugs 23 to generate a rattle, thereby realizing positioning echo.

The embodiments of the present invention described above are intended to be illustrative only and not limiting, and any person skilled in the art may make various modifications, changes or substitutions without departing from the technical scope of the present invention, and therefore all equivalent similar technical methods are intended to be included in the scope of the present invention.

Claims

1. The tapping device for power distribution is used for being inserted into a power track to take power, wherein a live wire conductor, a zero wire conductor and a ground wire conductor are respectively arranged in the power track; the method is characterized in that: the tapping device (14) comprises an upper socket (141) and a lower base body (143), wherein the upper socket (141) is provided with a jack (1411) for inserting an external electric device plug, the lower base body (143) is used for being inserted into an electric power track to take electricity, the lower base body (143) comprises a ground wire contact piece (1431) arranged along the axis of a base body rotating shaft (18) and a rotating arm (144) arranged at right angles to the ground wire contact piece (1431), and two ends of the rotating arm (144) are respectively provided with a live wire contact piece (1441) and a zero wire contact piece (1442); the jack (1411) of the socket (141) at the upper part of the tapping device (14) is connected with a live wire contact (1441), a neutral wire contact (1442) and a ground wire contact (1431) through a plug-in component (142) arranged inside the tapping device (14);

an L-shaped live wire contact piece (1441) and a zero wire contact piece (1442) are respectively arranged on the rotating arm (144) of the tapping device (14); one end of the L-shaped live wire contact element (1441) and the zero wire contact element (1442) exposed out of the rotating arm (144) is of an inserting sheet structure, and the other end of the L-shaped live wire contact element extends into the tap connector (14) and is connected with the inserting assembly (142);

the ground contact (1431) of the tapping device (14) is a U-shaped metal sheet or a piston type conductor arranged at the bottom end of the base body rotating shaft (18);

the U-shaped metal sheet is embedded on the outer surface of the base body rotating shaft (18), the bottom of the U-shaped metal sheet is arranged on the contact surface of the rotating shaft (18) and the ground wire conductor (9) at the bottom of the cavity (1), and the open end of the U-shaped metal sheet extends into the tap connector (14) to be connected with the plug-in component (142);

the electric conductor consists of a sleeve (19), and a spring (21) and a contact (20) which are sequentially arranged in the sleeve (19) from top to bottom, and are all made of conductive materials, the sleeve (19) is nested in the rotating shaft (18), wherein the spring (21) is arranged between a sleeve base (191) and the contact (20), and the sleeve base (191) is connected with a plug-in component (142) in the tapping device (14);

the tapping device (14) is further provided with a protective cover (145) at the position corresponding to the rotating arm (144).

2. A tap for power distribution as defined in claim 1 wherein: the tap also includes a rotation limiting device.

3. A tap for power distribution as defined in claim 2, wherein: the rotation limiting device is characterized in that two semicircular grooves (22) are formed in the bottom shell of the tapping device (14), a protruding structure (23) is respectively arranged on the protection cover (145) along the tail end positions of the semicircular grooves (22), and the protruding structure (23) stretches into the semicircular grooves (22); the protruding structure (23) and the semicircular groove (22) cooperate to limit the rotation direction and the end position of the rotating arm (144).

4. A tap for power distribution as defined in claim 3, wherein: the tap further comprises echo means.

5. A tap for power distribution as defined in claim 4 wherein: the echo device is a poking piece (24) arranged at the tail end position of the semicircular groove (22), and when the protruding structure (23) enters or leaves the tail end position of the semicircular groove (22), the poking piece (24) collides with the protruding structure (23) to generate noise.

6. A power distribution device comprising a power rail, comprising a tap for power distribution according to any one of claims 1 to 5, characterized in that: the electric power rail is a closed structure with a longitudinal opening, and the closed structure is formed by connecting a plurality of integrally formed cavities; grooves are formed in the two side walls of the cavity along the longitudinal opening respectively and are used for installing live wire conductors and zero wire conductors respectively; a convex structure is arranged at the bottom of the cavity and faces the longitudinal opening to serve as a ground wire conductor; the width of the opening is 4 mm-5 mm;