CN215681665U - Three-wire butt joint power head - Google Patents

Abstract

The utility model discloses a three-wire butt joint power supply head which is arranged at one end of a track and comprises a power supply box, a conductive assembly and a ground wire assembly; the power supply box comprises a front port and a rear port; the rear port is detachably connected with the rear end of the front port, and the front end of the front port is detachably connected with the track; the conductive assembly comprises a front conductive sheet and a rear conductive sheet; the front end conducting plate is arranged at the front port, and the rear end conducting plate is arranged at the rear port; the front end of the rear end conducting plate is in conductive connection with the front end conducting plate; the front conducting plate is electrically connected with the conducting copper strip of the track; the ground wire assembly is arranged below the power box and used for ground protection. The three-wire butt joint power supply head can be detachably connected with the front port through the rear port, the applicability of the three-wire butt joint power supply head is improved, the three-wire butt joint power supply head can be used for supplying power and can also be used as a connector, and the requirements of users in different scenes are met.

Description

Three-wire butt joint power head

Technical Field

The utility model relates to the field of track lamp power sources, in particular to a three-wire butt joint power source head.

Background

The track lamp is a lamp installed on a preset track, the existing track lamp generally comprises a track, a power head installed at one end of the track and a lamp body assembly, and the irradiation position of light can be adjusted by adjusting the position of the lamp body assembly on the track so as to meet various lighting requirements.

However, the conventional power supply head has a simple structure and a single function, so that the requirements of different markets and different customers cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a three-wire pair power connection source head to solve the problems of simple structure and single function of the power connection head.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a three-wire butt joint power supply head which is arranged at one end of a track and comprises a power supply box, a conductive assembly and a ground wire assembly;

the power supply box comprises a front port and a rear port; the rear port is detachably connected to the rear end of the front port, and the front end of the front port is detachably connected with the track;

the conductive assembly comprises a front conductive sheet and a rear conductive sheet; the front end conducting plate is arranged at the front port, and the rear end conducting plate is arranged at the rear port; the front end of the rear end conducting plate is in conducting connection with the front end conducting plate; the front-end conducting plate is electrically connected with the conducting copper strip of the track;

the ground wire assembly is arranged below the power box and used for ground protection.

In the three-wire pair power connection source, the front conducting strip comprises a front left copper piece and a front right copper piece; the front-end left copper piece and the front-end right copper piece are bilaterally symmetrical and respectively comprise a conductive contact part, a transition part and a conduction part which are sequentially connected;

the conductive contact parts of the front-end left copper piece and the front-end right copper piece are respectively connected with the conductive copper strips on the left side and the right side of the track;

the rear end conducting strip comprises a rear end left copper piece and a rear end right copper piece; the rear-end left copper piece and the rear-end right copper piece are identical in structure and respectively comprise a connecting part and a lead part which are connected with each other;

the connecting part of the front-end left copper piece is detachably connected with the conducting part of the rear-end left copper piece; the connecting part of the front-end right copper piece is detachably connected with the conduction part of the rear-end right copper piece;

and the lead parts of the rear-end left copper piece and the rear-end right copper piece are respectively connected with an external power supply.

In the three-wire butt-joint power supply head, the rear end of the conduction part is provided with a plug, the connecting part is provided with an inner hole matched with the plug, and the plug is inserted in the inner hole.

In the three-wire pair connection power supply head, the front port comprises a front port upper cover and a front port lower cover; the front port upper cover is buckled above the front port lower cover;

the front port upper cover comprises a first fixing part and a first inserting part; the first inserting part is arranged at the rear end of the first fixing part;

the front port lower cover comprises a second fixing part and a second inserting part, and the second inserting part is arranged at the rear end of the second fixing part; the rear end of the second fixing part is provided with a connecting lug;

the first fixing part and the second fixing part are matched to form a fixing part, and the width of the fixing part is matched with the inner diameter of the track; the first insertion part and the second insertion part are matched to form an insertion part, and the width of the insertion part is larger than that of the fixing part;

the rear port is detachably connected with the plug part.

In the three-wire pair power connection source, through grooves are formed in the left side and the right side of the fixing part, the conductive contact part of the front-end left copper part extends out of the through groove in the left side, and the conductive contact part of the front-end right copper part extends out of the through groove in the right side;

the transition part of the front-end left copper piece is positioned on the left inner wall of the fixing part, and the transition part of the front-end right copper piece is positioned on the right inner wall of the fixing part;

and the conduction part of the front-end left copper part is positioned on the left inner wall of the insertion part, and the conduction part of the front-end right copper part is positioned on the right inner wall of the insertion part.

In the three-wire pair power connection source, the rear port comprises a shell, a connecting piece and a tail plug;

the connecting piece is arranged at the front end of the shell and provided with a conductive channel and a connecting groove; the connecting groove is provided with a connecting groove matched with the connecting lug;

an accommodating space is arranged in the shell, and the tail plug is arranged at the rear end of the accommodating space;

the lead part is fixed on the tail plug, and the connecting part is inserted into the conductive channel; the rear end conducting strip is connected with the front end conducting strip through the conducting channel.

In the three-wire pair power connection source, the ground wire assembly comprises a ground wire and a ground wire iron sheet;

the ground wire is fixed on the bottom surface of the second fixing part and extends into the second inserting part;

the ground wire iron sheet is fixed at the bottom of the rear port, and a spring piece is arranged at the front end of the ground wire iron sheet and is bent upwards;

the ground wire is tightly propped against the top surface of the spring piece.

In the three-wire pair power connection source head, still include the upper cover, the upper cover is in the top of back port and grafting portion, the rear end of upper cover is equipped with the connecting hole.

In the three-wire pair power connection source, a through hole is formed in the top surface of the upper cover, and the shell is provided with a fixing hole corresponding to the through hole;

the upper cover and the rear port are fixedly connected with the screw through the fixing hole.

One technical scheme in the utility model can have the following beneficial effects:

the three-wire butt joint power head is provided with a rear port which can be detachably connected with the front port, when the rear port is connected with the front port, the three-wire butt joint power head is communicated with two poles of a power supply through the rear port and is connected with a conductive copper strip of a track through the front port, and the rear port and the front port are matched to be used as a power connector to realize conductive connection between the track and the power supply. When the rear port can be detached from the front port, the front port of the three-wire pair connection power source head can be connected with an external circuit element, and the front port is used as a connector; the three-wire butt joint power supply head can be used for supplying power and can also be used as a connector, the applicability of the three-wire butt joint power supply head is improved, and the requirements of users in different scenes are met.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

FIG. 2 is an installation resolution diagram of one embodiment of the present invention;

FIG. 3 is an exploded view of one embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a front port cover according to one embodiment of the present invention;

FIG. 5 is a schematic structural view of a front port lower cover according to one embodiment of the present invention;

FIG. 6 is a schematic diagram of a rear port in one embodiment of the utility model;

FIG. 7 is a schematic structural view of a front right copper member according to one embodiment of the present invention;

FIG. 8 is a schematic structural view of a rear right copper member in one embodiment of the present invention;

in the drawings: the ground wire assembly comprises a conductive assembly 2, a ground wire assembly 3, an upper cover 4 and a track 5;

a front port 11, a rear port 12; a front conductive plate 21 and a rear conductive plate 22; a ground wire 31, a ground wire iron piece 32; a connection hole 41;

a front port upper cover 111, a front port lower cover 112; a housing 121, a connector 122, a tail plug 123; a front left copper piece 211, a front right copper piece 212; a rear left copper piece 221, a rear right copper piece 222; a spring plate 321;

a plug-in portion 1112; a through groove 1113; a through-hole 1114; a first fixing portion 1111a and a first inserting portion 1111 b; a second fixing portion 1112a, a second inserting portion 1112 b; the connection bumps 1112 c; conductive paths 1221, connection grooves 1222;

the conductive contact part a, the transition part b, the conduction part c and the plug d; a connecting part e and a lead part f; and (7) fixing holes g.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 8, the utility model provides a three-wire butt joint power supply head, which is installed at one end of a track 5, and comprises a power supply box, a conductive component 2 and a ground wire component 3;

the power supply box comprises a front port 11 and a rear port 12; the rear port 12 is detachably connected to the rear end of the front port 11, and the front end of the front port 11 is detachably connected with the track 5;

the conductive assembly 2 comprises a front conductive sheet 21 and a rear conductive sheet 22; the front conducting plate 21 is arranged at the front port 11, and the rear conducting plate 22 is arranged at the rear port 12; the front end of the rear end conducting plate 22 is in conducting connection with the front end conducting plate 21; the front conducting strip 21 is electrically connected with the conducting copper strip of the track 5;

the ground wire component 3 is arranged below the power supply box, and the ground wire component 3 is used for ground protection.

In the embodiment of the utility model, the power supply box is divided into a rear port 12 and a front port 11, the front end of the front port 11 is installed on the rail 5, and the rear end of the front port 11 is detachably connected with the rear port 12.

The front conducting plate 21 is installed at the front port 11, the rear conducting plate 22 is installed at the rear port 12, and when the rear port 12 is connected with the front port 11, the front conducting plate 21 and the rear conducting plate 22 are connected and electrified with each other.

The ground wire component 3 is arranged below the power supply box, after the three-wire butt joint power supply head is installed, one end of the ground wire component 3 is in contact with the wall surface, and the other end of the ground wire component 3 is connected to the outer side of the power supply box, so that the effect of preventing electric shock accidents caused by the fact that the shell of an electric appliance is electrified due to internal insulation damage is achieved.

When the rear port 12 is connected with the front port 11, the three-wire butt joint power supply connector is communicated with two poles of a power supply through the rear port 12 and is connected with the conductive copper bar of the track 5 through the front port 11, and the rear port 12 and the front port 11 are matched to be used as the power supply connector, so that the conductive connection between the track 5 and the power supply is realized. When the rear port 12 is detachable from the front port 11, the front port 11 of the three-wire pair power source can be connected to an external circuit component, and the front port 11 is used as a connector.

The three-wire butt joint power supply head can be detachably connected with the front port 11 through the rear port 12, the applicability of the three-wire butt joint power supply head is improved, the three-wire butt joint power supply head can be used for supplying power and can also be used as a connector, and the requirements of users in different scenes are met.

Referring to fig. 2, 7 and 8, specifically, the front conductive sheet 21 includes a front left copper piece 211 and a front right copper piece 212; the front-end left copper piece 211 and the front-end right copper piece 212 are bilaterally symmetrical and respectively comprise a conductive contact part a, a transition part b and a conduction part c which are sequentially connected;

the conductive contact parts a of the front left copper piece 211 and the front right copper piece 212 are respectively connected with conductive copper bars on the left side and the right side of the track;

the rear conductive plate 22 comprises a rear left copper piece 221 and a rear right copper piece 222; the rear-end left copper piece 221 and the rear-end right copper piece 222 have the same structure and respectively comprise a connecting part e and a lead part f which are connected with each other;

the connecting part e of the front-end left copper piece 211 is detachably connected with the conducting part c of the rear-end left copper piece 221; the connecting part e of the front-end right copper piece 212 is detachably connected with the conducting part c of the rear-end right copper piece 222;

the lead portions f of the rear left copper piece 221 and the rear right copper piece 222 are respectively connected to an external power supply.

When the rear port 12 is connected with the front port 11, the front left copper piece 211 is connected with the rear left copper piece 221 to form a conductor, the front right copper piece 212 is connected with the rear right copper piece 222 to form another conductor, and the two conductors are arranged in parallel; one conductor of the two conductors is communicated with a live wire, and the other conductor is communicated with a zero line, so that three lines are connected with a power supply source.

With the arrangement, when the rear port 12 is connected with the front port 11, the three-wire butt joint power supply head can supply power to the track lamp; when the rear port 12 is detached from the rear end of the front port 11, the front conductive plate 21 is separated from the rear conductive plate 22, and the line structure between the rear port 12 and the front port 11 is not affected.

Specifically, the rear end of the conduction part c is provided with a plug d, the connection part e is provided with an inner hole (not shown) matched with the plug d, and the plug d is inserted into the inner hole.

By adopting the connection mode, screws are not needed for fixing, so that the front-end left copper piece 211 and the rear-end left copper piece 221, and the front-end right copper piece 212 and the rear-end right copper piece 222 can be tightly matched. When the rear port 12 is connected with the front port 11, the plug d is directly arranged in the inner hole; when the rear port 12 is separated from the rear end of the front port 11, the plug d is pulled out from the inner hole, so that the front-end left copper piece 211 is conveniently connected with and disconnected from the rear-end left copper piece 221, the front-end right copper piece 212 and the rear-end right copper piece 222, and therefore a worker can conveniently connect and detach the rear port 12 and the front port 11.

In the embodiment of the utility model, the electric gap between the plug d of the front left copper piece 211 and the plug d of the front right copper piece 212 is 16.50-19.50 mm. So set up, the electric clearance of front end left copper 211 and front end right copper 212 accords with national standard, in the environment of 220V high voltage electricity, is guaranteeing that electric property is stable and safe.

Referring to fig. 1, 2, 4 and 5, specifically, the front port 11 includes a front port upper cover 111 and a front port lower cover 112; the front port upper cover 111 is buckled above the front port lower cover 112;

the front port upper cover 111 includes a first fixing portion 1111a and a first insertion portion 1111 b; the first inserting-connecting part 1111b is arranged at the rear end of the first fixing part 1111 a;

the front port lower cover 112 includes a second fixing portion 1112a and a second inserting portion 1112b, and the second inserting portion 1112b is disposed at a rear end of the second fixing portion 1112 a; a connecting bump 1112c is arranged at the rear end of the second fixing part 1112 a;

the first fixing part 1111a and the second fixing part 1112a are matched to form a fixing part, and the width of the fixing part is matched with the inner diameter of the track 5; the first inserting-connecting part 1111b and the second inserting-connecting part 1112b are matched to form an inserting-connecting part 1112, and the width of the inserting-connecting part 1112 is larger than that of the fixing part;

the rear port 12 is detachably connected to the insertion part 1112.

The front port upper cover 111 is fastened to the front port lower cover 112 to form the front port 11, a cavity is formed between the front port upper cover 111 and the front port lower cover 112, and the front end conductive plate 21 is installed in the cavity. The front port is divided into two parts according to the width, a fixed part is formed by matching a first fixed part 1111a with a second fixed part 1112a, and a plugging part 1112 is formed by matching a first plugging part 1111b with a second plugging part 1112 b. With this arrangement, the front port 11 is firmly fixed to one end of the rail 5, and stability between the power supply box and the rail 5 is improved.

In an embodiment of the present invention, the fixing portion is provided with a screw hole and a screw, and is fixed at one end of the rail 5 through the screw hole and the screw, so that the front port 11 can be firmly installed on the rail 5, and the installation and the disassembly are convenient, and time and labor are saved.

Referring to fig. 1 and fig. 2, in particular, through slots 1113 are formed on both left and right sides of the fixing portion, the conductive contact portion a of the front-end left copper piece 211 extends out of the through slot 1113 on the left side, and the conductive contact portion a of the front-end right copper piece 212 extends out of the through slot 1113 on the right side;

the transition part b of the front-end left copper piece 211 is positioned on the left inner wall of the fixing part, and the transition part b of the front-end right copper piece 212 is positioned on the right inner wall of the fixing part;

the conduction part c of the front-end left copper piece 211 is located on the left inner wall of the insertion part 1112, and the conduction part c of the front-end right copper piece 212 is located on the right inner wall of the insertion part 1112.

Referring to fig. 1 and 2, in an embodiment of the utility model, the conductive contact a of the front left copper member 211 extends from the left through slot 1113 and abuts against the conductive copper strip on the left side of the rail 5; the conductive contact part a of the front right copper piece 212 extends out of the right through groove 1113 and tightly abuts against the conductive copper strip on the right side of the track 5; the contact area of the three-wire pair power connection source head and the conductive copper bar of the track 5 is increased by the contact of the conductive contact part a and the conductive copper bar of the track 5, and the conductivity of the three-wire pair power connection source head is improved.

Referring to fig. 2 and 5, specifically, the rear port 12 includes a housing 121, a connecting member 122 and a tail plug 123;

the connecting piece 122 is arranged at the front end of the housing 121, and the connecting piece 122 is provided with a conductive channel 1221 and a connecting groove 1222; the connecting groove 1222 is provided with a connecting groove 1222 matched with the connecting lug 1112 c;

an accommodating space is arranged in the shell 121, and the tail plug 123 is mounted at the rear end of the accommodating space;

the lead part f is fixed on the tail plug 123, and the connecting part e is inserted into the conductive passage 1221; the rear conductive plate 22 is connected to the front conductive plate 21 through the conductive passage 1221.

The rear left copper piece 221 and the rear right copper piece 222 are arranged in the accommodating space; in the embodiment of the present invention, the connecting member 122 is provided with two conductive paths 1221, and the two conductive paths 1221 are respectively disposed at the left and right sides of the connecting groove 1222. The connection portions e of the rear left copper piece 221 and the rear right copper piece 222 are respectively inserted into the left and right conductive paths 1221.

The tail plug 123 plays a limiting role, the rear-end left copper piece 221 and the rear-end right copper piece 222 are fixed, the positions of the rear-end left copper piece 221 and the rear-end right copper piece 222 are prevented from changing, the front-end left copper piece 211 and the rear-end left copper piece 221 are caused to be between, the front-end right copper piece 212 and the rear-end right copper piece 222 cannot be aligned due to forward movement of the positions, and therefore the problem that the front-end left copper piece 211 and the rear-end left copper piece 221 are prevented from being connected, and the front-end right copper piece 212 and the rear-end right copper piece 222 cannot be connected is solved.

When the rear port 12 and the front port 11 are connected, the connection projection 1112c is inserted into the connection groove 1222, and the rear port 12 and the front port 11 are detachably connected by the connection of the connection groove 1222 and the connection projection 1112 c. So arranged, the connection and the disconnection of the rear port 12 and the front port 11 are facilitated.

Referring to fig. 3, specifically, the ground wire assembly 3 includes a ground wire 31 and a ground wire iron sheet 32;

the ground wire 31 is fixed on the bottom surface of the second fixing portion 1112a and extends into the second inserting portion 1112 b;

the ground iron sheet 32 is fixed at the bottom of the rear port 12, a spring piece 321 is arranged at the front end of the ground iron sheet 32, and the spring piece 321 is bent upwards;

the ground wire 31 is tightly pressed against the top surface of the spring piece 321.

The ground wire 31 is arranged at the front port 11, the ground wire iron sheet 32 is arranged at the rear port, and when the three-wire butt joint power supply head is installed, the ground wire iron sheet 32 is in contact with the wall surface; when the rear port 12 is connected with the front port 11, the ground iron sheet 32 is connected with the ground 31 through the spring piece 321, the spring piece 321 has elasticity, and the spring piece 321 is tightly abutted to the bottom surface of the ground 31, so that the purpose of tightly matching the ground 31 with the ground iron sheet 32 is realized.

Further, the three-wire butt joint power supply connector further comprises an upper cover 4, the upper cover 4 covers the rear port 12 and the inserting part 1112, and a connecting hole 41 is formed in the rear end of the upper cover 4.

The upper cover 4 plays a role in protecting the power supply box, prevents dust, insects and other sundries from entering the power supply box, and avoids the sundries from influencing the electrical performance of the three-wire power connection source. The connection hole 41 is used to communicate the inside and outside of the upper cover 4, so that the wiring of the power supply box can be connected to the external wiring.

Furthermore, the top surface of the upper cover 4 is provided with a through hole 1114, and the housing 121 is provided with a fixing hole g corresponding to the through hole 1114;

the upper cover 4 and the rear port 12 are fixedly connected with screws through the fixing holes g.

In an embodiment of the present invention, the upper cover 4 and the rear port 12 are fixedly connected with the screw through the fixing hole g, and with this structure, the upper cover 4 and the rear port 12 are stably connected, and the installation process is simple.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the utility model and should not be construed in any way as limiting the scope of the utility model. Other embodiments of the utility model will occur to those skilled in the art without the exercise of inventive faculty based on the explanations herein, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined in the appended claims.

Claims (9)

1. The utility model provides a three-way butt joint power head, installs in orbital one end, its characterized in that: the three-wire butt joint power head comprises a power box, a conductive assembly and a ground wire assembly;

the power supply box comprises a front port and a rear port; the rear port is detachably connected to the rear end of the front port, and the front end of the front port is detachably connected with the track;

the conductive assembly comprises a front conductive sheet and a rear conductive sheet; the front end conducting plate is arranged at the front port, and the rear end conducting plate is arranged at the rear port; the front end of the rear end conducting plate is in conducting connection with the front end conducting plate; the front-end conducting plate is electrically connected with the conducting copper strip of the track;

the ground wire assembly is arranged below the power box and used for ground protection.

2. A three-wire docking power connector as defined in claim 1, wherein: the front conducting strip comprises a front left copper piece and a front right copper piece; the front-end left copper piece and the front-end right copper piece are bilaterally symmetrical and respectively comprise a conductive contact part, a transition part and a conduction part which are sequentially connected;

the conductive contact parts of the front-end left copper piece and the front-end right copper piece are respectively connected with the conductive copper strips on the left side and the right side of the track;

the rear end conducting strip comprises a rear end left copper piece and a rear end right copper piece; the rear-end left copper piece and the rear-end right copper piece are identical in structure and respectively comprise a connecting part and a lead part which are connected with each other;

the connecting part of the front-end left copper piece is detachably connected with the conducting part of the rear-end left copper piece; the connecting part of the front-end right copper piece is detachably connected with the conduction part of the rear-end right copper piece;

and the lead parts of the rear-end left copper piece and the rear-end right copper piece are respectively connected with an external power supply.

3. A three-wire docking power head as claimed in claim 2, wherein: the rear end of the conduction part is provided with a plug, the connection part is provided with an inner hole matched with the plug, and the plug is inserted in the inner hole.

4. A three-wire docking power head as claimed in claim 2, wherein: the front port comprises a front port upper cover and a front port lower cover; the front port upper cover is buckled above the front port lower cover;

the front port upper cover comprises a first fixing part and a first inserting part; the first inserting part is arranged at the rear end of the first fixing part;

the front port lower cover comprises a second fixing part and a second inserting part, and the second inserting part is arranged at the rear end of the second fixing part; the rear end of the second fixing part is provided with a connecting lug;

the first fixing part and the second fixing part are matched to form a fixing part, and the width of the fixing part is matched with the inner diameter of the track; the first insertion part and the second insertion part are matched to form an insertion part, and the width of the insertion part is larger than that of the fixing part;

the rear port is detachably connected with the plug part.

5. A three-wire docking power head as defined in claim 4, wherein: the left side and the right side of the fixing part are both provided with through grooves, the conductive contact part of the front-end left copper piece extends out of the through groove on the left side, and the conductive contact part of the front-end right copper piece extends out of the through groove on the right side;

the transition part of the front-end left copper piece is positioned on the left inner wall of the fixing part, and the transition part of the front-end right copper piece is positioned on the right inner wall of the fixing part;

and the conduction part of the front-end left copper part is positioned on the left inner wall of the insertion part, and the conduction part of the front-end right copper part is positioned on the right inner wall of the insertion part.

6. A three-wire docking power head as defined in claim 4, wherein: the rear port comprises a shell, a connecting piece and a tail plug;

the connecting piece is arranged at the front end of the shell and provided with a conductive channel and a connecting groove; the connecting groove is provided with a connecting groove matched with the connecting lug;

an accommodating space is arranged in the shell, and the tail plug is arranged at the rear end of the accommodating space;

the lead part is fixed on the tail plug, and the connecting part is inserted into the conductive channel; the rear end conducting strip is connected with the front end conducting strip through the conducting channel.

7. A three-wire docking power head as defined in claim 4, wherein: the ground wire assembly comprises a ground wire and a ground wire iron sheet;

the ground wire is fixed on the bottom surface of the second fixing part and extends into the second inserting part;

the ground wire iron sheet is fixed at the bottom of the rear port, and a spring piece is arranged at the front end of the ground wire iron sheet and is bent upwards;

the ground wire is tightly propped against the top surface of the spring piece.

8. A three-wire docking power head as defined in claim 7, wherein: the upper cover is arranged above the rear port and the insertion part, and a connecting hole is formed in the rear end of the upper cover.

9. A three-wire docking power head as defined in claim 8, wherein: the top surface of the upper cover is provided with a through hole, and the shell is provided with a fixing hole corresponding to the through hole;

the upper cover and the rear port are fixedly connected with the screw through the fixing hole.

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