CN110061391B

CN110061391B - Electrical connector

Info

Publication number: CN110061391B
Application number: CN201910259396.4A
Authority: CN
Inventors: 程伟进
Original assignee: Lotes Guangzhou Co Ltd
Current assignee: Lotes Guangzhou Co Ltd
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2021-02-26
Anticipated expiration: 2039-04-02
Also published as: CN110061391A

Abstract

The invention discloses an electric connector, which is used for butting a butting part, wherein the butting part is provided with a grounding conducting strip, a signal conducting strip and an upper shielding part, and comprises: the insulation body is provided with a front end face, and a butt joint groove is arranged backwards from the front end face and used for inserting a butt joint piece; the grounding terminal and the signal terminal are arranged on the insulating body, the grounding terminal part is exposed out of the butt joint groove to be contacted with the grounding conducting strip, and the signal part is exposed out of the butt joint groove to be contacted with the signal conducting strip; the metal shell covers the insulating body, the metal shell comprises a top plate and is positioned above the insulating body, the metal shell is provided with a first grounding portion connected with the top plate, the first grounding portion extends forwards from the top plate and is bent backwards to expose in the butt joint groove for contacting with the upper shielding part, the top plate extends downwards in a protruding mode to form a second grounding portion, the top plate extends backwards to form a third grounding portion, the second grounding portion and the third grounding portion are in contact with the same grounding terminal, and a fixing portion extending backwards from the top plate is matched and fixed with the insulating body. The high frequency performance of the electrical connector is enhanced.

Description

Electrical connector

[ technical field ] A method for producing a semiconductor device

The present invention relates to an electrical connector, and more particularly, to an electrical connector with improved high frequency performance.

[ background of the invention ]

Nowadays, electrical connectors are used in various fields of life, and with the development of scientific technology, the exchange rate between information is faster and faster, so that the requirement for electrical connectors is higher and higher, and not only the electrical connector assembly is required to support the fast transmission rate, but also the service life of the electrical connector is required to be improved. The known electric connector is used for being butted with a butting element and is provided with an insulating body, the front end of the insulating body is concavely provided with a butting groove backwards for accommodating the butting piece, a plurality of grounding terminals and a plurality of signal terminals are accommodated in the insulating body, a metal shell covers the outside of the insulating body, the metal shell comprises a top plate positioned above the insulating body, a lateral extension side plate is extended downwards from two sides of the top plate, and a plurality of butting elastic sheets are formed by protruding extension of the surface of the top plate and correspondingly butted with the grounding terminals.

In the electric connector, the metal shell is contacted with the grounding terminal to realize the shielding function, but the metal shell is only contacted with the grounding terminal through the abutting elastic sheet which protrudes from the top plate, the contact area is small, so that the shielding effect is not obvious, and the high-frequency performance of the electric connector is influenced.

Therefore, in view of the above problems, a new electrical connector needs to be designed to solve the above drawbacks.

[ summary of the invention ]

In view of the problems in the background art, the present invention is directed to an electrical connector that achieves shielding and improves high frequency performance.

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

an electrical connector for mating with a mating member having at least one ground conductive pad, at least one signal conductive pad and an upper shield member on an upper side thereof, comprising: the insulating body is provided with a front end face, and a butt joint groove is arranged backwards from the front end face in a concave mode and used for splicing the butt joint piece; at least one grounding terminal, disposed on the insulating body, wherein each grounding terminal portion is exposed to the butt-joint groove for contacting the grounding conductive sheet; at least one signal terminal arranged on the insulating body, wherein each signal terminal part is exposed out of the butt joint groove and is used for contacting the signal conducting strip; the metal shell covers the insulating body and comprises a top plate positioned above the insulating body, the metal shell is provided with at least one first grounding part connected with the top plate, the first grounding part extends forwards from the top plate and is bent backwards to expose the butt joint groove for contacting with the upper shielding part, at least one second grounding part is formed by extending downwards from the top plate, at least one third grounding part extends backwards from the top plate, one second grounding part and one third grounding part are contacted with the same grounding terminal, and at least one fixing part is extended backwards from the top plate and is matched and fixed with the insulating body.

Further, each of the third ground portions laterally abuts one of the ground terminals in the left-right direction.

Furthermore, the grounding terminals are provided in plurality, the metal shell is provided with a plurality of second grounding parts and a plurality of third grounding parts, and each grounding terminal is contacted with one of the second grounding parts and one of the third grounding parts.

Further, one part of the third ground parts laterally contacts the corresponding ground terminals to the left, and the other part of the third ground parts laterally contacts the corresponding ground terminals to the right.

Further, the top plate extends backward to form a plurality of fixing portions, and a plurality of second grounding portions and a plurality of third grounding portions are distributed between two fixing portions in the left-right direction.

Furthermore, each of the ground terminals has a main body disposed on the insulating body, and a first elastic arm and a second elastic arm extend forward from the main body, the first elastic arm has a first contact portion exposed downward to the mating slot for contacting the upper shield downward, the second elastic arm has a second contact portion exposed to the mating slot for contacting the ground conductive strip, and the first contact portion is located in front of the second contact portion.

Furthermore, the second grounding part is formed by stamping the top plate, and the second grounding part is of a cantilever structure and is downwards abutted to one of the first elastic arms.

Further, the second grounding part extends obliquely downward from back to front.

Furthermore, the insulation body is provided with a rear end face, the rear end face is concavely provided with a mounting groove from back to front, the mounting groove upwards penetrates through the insulation body, the main body upwards extends an extension arm to protrude into the mounting groove, and the third grounding part is laterally abutted against the extension arm in the left-right direction.

Further, the docking member has a lower shield member located at a lower side thereof, and a third elastic arm extends forward from the main body, and the third elastic arm has a third contact portion exposed upward from the docking slot for contacting the lower shield member upward.

Further, the second contact portion and the third contact portion are in contact with the upper side and the lower side of the butt joint piece, and the third contact portion is located between the first contact portion and the second contact portion.

Further, the main body is provided with a connecting part, the connecting part is connected with the second elastic arm and the third elastic arm, and the distance between the second contact part and the third contact part in the vertical direction is larger than the size of the connecting part in the vertical direction.

Further, the main part is provided with a through hole which penetrates in the left-right direction, the through hole is located behind the connecting part, and the through hole and the connecting part are aligned in the front-back direction.

Furthermore, the front end of the top plate bends downwards and backwards to form at least one bent part, and the bent part is matched with the insulating body in a clamping manner.

Furthermore, each side of the top plate extends downwards to form a side plate, the side plate is provided with a clamping hole which penetrates through the side plate in the left-right direction, the left side and the right side of the insulating body are respectively provided with a convex block protruding outwards, and the convex blocks extend into the clamping holes to be matched.

The butt joint device comprises a butt joint groove, two fixing pieces, an insulating body and a buckling arm, wherein the butt joint groove is formed in the insulating body, the two fixing pieces are located on the left side and the right side of the butt joint groove, each fixing piece is provided with a fixing portion fixed with the insulating body, an extending portion extends from the fixing portion in a bending mode, the extending portion extends forwards to form the buckling arm, and the buckling arm is provided with a buckling portion protruding into the butt joint groove and used for buckling the butt joint piece.

Further, the insulating body is provided with a top wall positioned above the butt joint groove, a bottom wall positioned below the butt joint groove and a rear wall connecting the top wall and the bottom wall, and the holding part is held on the top wall and extends forwards to exceed the rear wall.

Further, the buckling arm is provided with a bending section which is formed by protruding towards the butt joint groove in the left-right direction.

Further, the holding part and the buckling arm are located at different heights in the vertical direction.

Further, the ground terminal is of a blanking structure, and the signal terminal is of a stamping and bending structure.

Compared with the prior art, the electric connector designed by the invention has the following beneficial effects:

the metal shell is provided with the first grounding part which is contacted with the upper shielding part of the butt joint part, and also provided with the second grounding part and the third grounding part which are contacted with the same grounding terminal, so that the contact area and the contact range are increased, the shielding capability of the grounding terminal and the metal shell to the signal terminal is improved, the high-frequency performance of the electric connector is enhanced, and the electric connector meets higher use requirements.

[ description of the drawings ]

Fig. 1 is a perspective view of an electrical connector and an opposing member of the present invention;

fig. 2 is an exploded perspective view of the electrical connector of fig. 1;

fig. 3 is a perspective view of the metal shell of the electrical connector of fig. 2, turned 180 degrees;

FIG. 4 is a partial cross-sectional view of the mating member of FIG. 1 after mating with an electrical connector;

fig. 5 is a perspective view of the ground terminal of fig. 1;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 7 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 8 is a perspective view of FIG. 4 taken in a stepped cross-section;

FIG. 9 is a top view of the unmated mating member of FIG. 7;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 4;

FIG. 11 is a cross-sectional view taken along line D-D of FIG. 4;

fig. 12 is a top view of the mating member of fig. 1 mated with the electrical connector.

Detailed description of the embodiments reference is made to the accompanying drawings in which:

[ detailed description ] embodiments

The invention will now be described in further detail with reference to specific embodiments and illustrations for a better understanding of the invention.

For convenience of description, the x-axis is defined as the front-back direction, the y-axis is defined as the left-right direction, and the z-axis is defined as the up-down direction.

Referring to fig. 1, the electrical connector 100 of the present invention is used for butting a butting member 200, the electrical connector 100 is downwardly mounted on a circuit board 300, and the butting member 200 is rearwardly inserted into the electrical connector 100 to form an electrical connection.

Referring to fig. 2 and fig. 3, the electrical connector 100 has an insulating body 1, a plurality of ground terminals 2 and a plurality of signal terminals 3 disposed on the insulating body 1, two fixing members 4 fixed on the left and right sides of the insulating body 1, and a metal shell 5 covering the insulating body 1.

Referring to fig. 2 and fig. 4, the insulating body 1 has a front end surface 101, a rear end surface 102 and two side surfaces 103, the front end surface 101 and the rear end surface 102 are disposed opposite to each other in a front-rear direction, and the two side surfaces 103 connect the front end surface 101 and the rear end surface 102. A docking slot 11 is formed by recessing backward from the front end surface 101 for plugging the docking member 200. The insulation body 1 has a top wall 12 located above the butt-joint groove 11, a bottom wall 13 located below the butt-joint groove 11, and a rear wall 14 connecting the top wall 12 and the bottom wall 13, the rear wall 14 is located behind the butt-joint groove 11, the insulation body 1 further has two side walls 15 located at the left and right sides of the butt-joint groove 11, and the side walls 15 connect the top wall 12 and the bottom wall 13.

Referring to fig. 2 and 4, the top wall 12 has a plurality of first grooves 121, a plurality of second grooves 122 and a plurality of third grooves 123 recessed rearward from the front end surface 101, a front portion of the first groove 121 close to the front end surface 101 penetrates the top wall 12 up and down and is communicated with the mating groove 11 downward, and a rear portion of the first groove 121 far from the front end surface 101 only penetrates the top wall 12 downward and is communicated with the mating groove 11 downward. The second grooves 122 and the third grooves 123 respectively penetrate through the top wall 12 up and down and are communicated with the docking slot 11 downward, the length of the third grooves 123 in the front-back direction is longer than that of the second grooves 122 in the front-back direction, and each first groove 121 is located between two third grooves 123 in the left-right direction. The top wall 12 is recessed downward at a portion close to the rear end surface 102 and further has a plurality of fixing slots 124, a rear end of each fixing slot 124 does not penetrate through the top wall 12 upward and also does not penetrate through the top wall 12 downward, and the fixing slots 124 are located behind the second grooves 122 and located on the same straight line with the second grooves 122 in the front-rear direction.

Referring to fig. 2 and 4, two receiving slots 16 and a plurality of mounting slots 125 are recessed forward from the rear end surface 102. Two receiving grooves 16 are formed on both left and right sides of the docking groove 11, each receiving groove 16 receives one of the fixing pieces 4, and a front portion of the receiving groove 16 communicates with the docking groove 11 in the left-right direction. The mounting groove 125 is located above the docking groove 11 and behind the docking groove 11, and the mounting groove 125 penetrates the top wall 12 upward. A bump 17 and a fixing block 18 are formed by protruding from each side surface 103, and the fixing block 18 is located behind the bump 17.

Referring to fig. 2, 5 and 6, in the present embodiment, the ground terminal 2 is formed by directly blanking a metal plate, that is, the ground terminal 2 is a blanking type terminal, and the ground terminal 2 is inserted into the insulating body 1 from back to front. The ground terminal 2 has a main body 21 in a flat plate shape, and the main body 21 is fixed to the insulating body 1. The main body 21 has a through hole 211, and the through hole 211 penetrates the main body 21 in the left-right direction and has an upper edge 2111 and a lower edge 2112.

Referring to fig. 2 and 6, a first elastic arm 22 extends from the main body 21 toward the mating slot 11, that is, the first elastic arm 22 extends forward from the main body 21, and the first elastic arm 22 is provided with a first contact portion 221 protruding downward into the mating slot 11.

Referring to fig. 5 and 6, the main body 21 has a connection portion 212 extending forward, the connection portion 212 is aligned with the through hole 211 in the front-rear direction, and the connection portion 212 is located below the first elastic arm 22 and located between the upper edge 2111 and the lower edge 2112 in the up-down direction. The front end of the connecting portion 212 is connected with a second elastic arm 23 upwards and connected with a third elastic arm 24 downwards, the second elastic arm 23 and the third elastic arm 24 extend forwards respectively, the second elastic arm 23 is provided with a second contact portion 231 which protrudes downwards into the butt-joint groove 11, the third elastic arm 24 is provided with a third contact portion 241 which protrudes upwards into the butt-joint groove 11, and the distance between the second contact portion 231 and the third contact portion 241 in the up-down direction is greater than the width of the connecting portion 212 in the up-down direction. In the front-rear direction, the third contact portion 241 is located between the first contact portion 221 and the second contact portion 231.

Referring to fig. 4 and 6, the main body 21 further extends upward to form an extension arm 25, and the extension arm 25 protrudes into the mounting groove 125 and is exposed upward from the top wall 12.

Referring to fig. 5 and 6, a grounding solder 26 is formed extending backward from the bottom end of the main body 21, and the grounding solder 26 exposes the insulating body 1 backward for being soldered to the circuit board 300 to form an electrical connection.

Referring to fig. 2 and 7, the signal terminals 3 are formed by stamping and bending a metal plate, each signal terminal 3 has an elastic arm 31 extending forward, the elastic arm 31 is provided with a connecting portion 311 protruding downward into the mating slot 11, the connecting portion 311 is located at the same height as the second contact portion 231 in the vertical direction and aligned with the second contact portion 231 in the left-right direction, and each signal terminal 3 further has a signal solder foot 32 exposed rearward out of the insulating body 1 for being soldered to the circuit board 300 to form an electrical connection.

Referring to fig. 2, 8, 9 and 10, the two fixing members 4 are located at the left and right sides of the abutting slot 11 and are installed into the two receiving slots 16 from the back to the front, each fixing member 4 is provided with a holding portion 41 fixed to the insulating body 1, the outer edge of the holding portion 41 is stepped from the back to the front, and the holding portion 41 is held on the top wall 12 and extends forward beyond the back wall 14. An extension part 42 is formed by bending and extending downwards from one side of the rear end of the holding part 41, a buckling arm 43 extends forwards from the extension part 42, the buckling arm 43 is positioned below the holding part 41, and as the buckling arm 43 and the holding part 41 are positioned on different planes in the vertical direction, the space of the insulating body 1 in the vertical direction is reasonably utilized, so that the holding part 41 meets the length required by design, and the fixing part 4 can be stably fixed in the accommodating groove 16. The latching arm 43 has a latching portion 431, and the latching portion 431 protrudes into the mating groove 11 in the left-right direction. The latching arm 43 has a bent section 432, the bent section 432 protrudes toward the mating groove 11 in the left-right direction and is located between the latching portion 431 and the extending portion 42 in the front-rear direction, and the bent section 432 increases the elasticity of the latching arm 43.

Referring to fig. 2 and 4, the metal shell 5 is formed by stamping a metal plate, and the metal shell 5 is mounted to the outer side of the insulating body 1 from front to back. The metal shell 5 has a top plate 51 located above the insulating body 1, and two side plates 52 respectively extending downward from two sides of the top plate 51, and the two side plates 52 correspondingly cover the two side walls 15.

Referring to fig. 2 and fig. 3, a plurality of bent portions 53 are formed by bending and extending downward and backward from the front end of the top plate 51, the bent portions 53 extend into the first groove 121 to be clamped and matched with the insulating body 1, so as to prevent the metal shell 5 from falling off, and the bent portions 53 are located behind the front end surface 101.

Referring to fig. 2, 3 and 11, the metal shell 5 has a plurality of first grounding portions 54 connected to the top plate 51, and each of the first grounding portions 54 is formed by bending and extending downward from the front end of the top plate 51 and is located between two bending portions 53 in the left-right direction. The first grounding portion 54 protrudes into the corresponding second groove 122.

Referring to fig. 2, 3 and 6, a plurality of second grounding portions 55 are formed at the middle position of the top plate 51 by pressing downward, and the second grounding portions 55 are cantilevers extending obliquely downward from the rear to the front, thereby increasing the elasticity of the second grounding portions 55. The second grounding portion 55 extends into the corresponding third groove 123 and contacts the first elastic arm 22 downward, so as to enhance the contact between the metal shell 5 and the grounding terminal 2. Of course, in another embodiment, the second grounding portion 55 may be a convex hull structure formed by pressing downward from the top plate 51, and only needs to abut against the grounding terminal 2.

Referring to fig. 2, 3 and 12, a plurality of third grounding portions 56 and a plurality of fixing portions 57 extend backward from the top plate 51, the plurality of third grounding portions 56 correspondingly extend backward into the plurality of mounting grooves 125, and each third grounding portion 56 laterally contacts with the corresponding extension arm 25 in the left-right direction, wherein a portion of the third grounding portions 56 of the plurality of third grounding portions 56 contacts the corresponding extension arm 25 in the left-right direction, and another portion of the third grounding portions 56 contacts the corresponding extension arm 25 in the right-right direction, so that the plurality of third grounding portions 56 apply opposite-direction forces to the plurality of grounding terminals 2, and the forces in the two directions can cancel a portion of each other, thereby reducing the stress generated to the electrical connector 100. The fixing portions 57 are inserted into the fixing grooves 124 in a backward direction, so that the metal case 5 and the insulating body 1 are fixed to each other. Of course, in other embodiments, the third ground portion 56 may abut the ground terminal 2 downward.

Referring to fig. 2, 3 and 4, each of the side plates 52 has a fastening hole 521 penetrating through the side plate 52 in the left-right direction, and the rear end of each of the side plates 52 is recessed forward to form an opening 522. The locking hole 521 is longer than the projection 17 in the front-rear direction and is located in front of the opening 522. When the metal shell 5 is mounted to the insulating body 1 from front to back, the protrusion 17 is fastened to the corresponding fastening hole 521, and slides in the fastening hole 521, and the opening 522 is fastened to the fixing block 18. A grounding pin 58 extends horizontally and outwards from the lower edge 2112 of each side plate 52, and the grounding pin 58 is soldered to the circuit board 300, so that the metal shell 5 and the circuit board 300 form a grounding connection.

Referring to fig. 1 and 2, the docking member 200 has a docking portion 6, a plurality of grounding conductive sheets 61 and a plurality of signal conductive sheets 62 are disposed on an upper surface of the docking portion 6 in parallel in a left-right direction, and the grounding conductive sheets 61 and the signal conductive sheets 62 are respectively exposed out of the docking portion 6. A concave part 63 is respectively arranged at the left and the right sides of the butt joint part 6. The butt joint piece 200 has an upper shield 7 covering the upside of the butt joint piece 200, just the rear portion of the upper shield 7 has an inclined plane 71 that inclines backward and downwards, the inclined plane 71 is located the place ahead of the butt joint part 6, the inclined plane 71 is used as the guide, reduces the insertion force of the butt joint piece 200 into the electric connector 100, avoids right the electric connector 100 causes the damage. The docking member 200 has a lower shield 8 covering the lower side of the docking member 200, and the rear end of the lower shield 8 covers the lower surface of the docking portion 6.

Referring to fig. 6 and 9, in the process that the docking member 200 is inserted into the docking slot 11 backwards, the first grounding portion 54 contacts the upper shielding member 7 downwards, the first contact portion 221 contacts the upper shielding member 7 downwards to form a grounding structure and slides on the upper shielding member 7 from back to front, and the first contact portion 221 facilitates the insertion of the docking member 200 and reduces the insertion force by being guided by the inclined surface 71. After the docking member 200 is completely inserted into the docking slot 11, the first contact portion 221 contacts the upper shield 7 downward, the contact position of the two is located in front of the inclined surface 71, the second contact portion 231 contacts the corresponding grounding conductive sheet 61 downward, the contact portion 311 contacts the corresponding signal conductive sheet 62 upward, and the third contact portion 241 contacts the lower shield 8 upward. The second contact portion 231 and the third contact portion 241 clamp the butting portion 6, and at the same time, the second elastic arm 23 and the third elastic arm 24 are deformed, and due to the existence of the connecting portion 212, the elasticity of the ground terminal 2 is increased, so as to play a role of buffering, and thus the second elastic arm 23 and the third elastic arm 24 are prevented from being broken; on the other hand, the through hole 211 is disposed behind the connection portion 212, and the connection portion 212 is located between the upper edge 2111 and the lower edge 2112 in the up-down direction, and provides an abdicating space for the connection portion 212, thereby further increasing the elasticity of the connection portion 212. The latching portion 431 extends into the corresponding recess 63 for latching, so as to prevent the mating part 200 and the electrical connector 100 from falling off.

Referring to fig. 6, the first contact portion 221 contacts the upper shield 7 downward, so that the first elastic arm 22 applies a downward acting force to the mating part 200, and transmits the acting force to the insulating housing 1 through the mating part 200, and since the insulating housing 1 is mounted downward to the circuit board 300, the circuit board 300 located below the insulating housing 1 provides an upward supporting force to the insulating housing 1, and the upward supporting force and the acting force applied by the first elastic arm 22 cancel each other, so that the insulating housing 1 is prevented from deforming, and the service life of the electrical connector 100 is prolonged.

In summary, the electrical connector of the present invention has the following advantages:

1. the metal housing 5 has the first ground part 54 contacting the upper shield 7 of the mating part 200, and also has the second ground part 55 and the third ground part 56 contacting the ground terminal 2, so that a ground path is formed between the electrical connector 100 and the mating part 200; meanwhile, the grounding terminal 2 and the metal shell 5 form multipoint grounding, so that the contact area and the contact range are increased, the shielding capability of the grounding terminal 2 and the metal shell 5 on the signal terminal 3 is improved, the high-frequency performance of the electric connector 100 is enhanced, and the electric connector meets higher use requirements.

2. After the metal shell 5 is mounted on the insulating body 1, the first grounding portion 54 abuts downward against the upper shield 7, and the second grounding portion 55 abuts downward against the grounding terminal 2, so that the metal shell 5 is subjected to a plurality of upward acting forces, and the rear end of the metal shell 5 and the insulating body 1 are fixed to each other by inserting the plurality of fixing portions 57 into the plurality of fixing grooves 124 in a backward corresponding manner. The situation that the metal shell 5 is warped due to upward acting force is avoided, so that the metal shell 5 can be stably installed on the insulating body 1.

3. The ground terminal 2 is provided with the first elastic arm 22 and the second elastic arm 23 located on the same side of the docking piece 200, the first contact portion 221 abuts against the upper shield 7 downward, the second contact portion 231 contacts the ground conductive sheet 61, and the first contact portion 221 is located in front of the second contact portion 231. The first elastic arm 22 exerts a force downwards on the butting part 20, and transmits the force to the insulating body 1 through the butting part 200, and since the insulating body 1 is mounted downwards on the circuit board 300, the circuit board 300 positioned below the insulating body 1 provides an upward supporting force to the insulating body 1, and the upward supporting force and the force exerted by the first elastic arm 22 are mutually offset, so that the insulating body 1 is prevented from deforming, and the service life of the electrical connector 100 is prolonged.

The above detailed description is only for the purpose of illustrating the preferred embodiments of the present invention, and not for the purpose of limiting the scope of the present invention, therefore, all technical changes that can be made by applying the present specification and the drawings are included in the scope of the present invention.

Claims

1. An electrical connector for mating with a mating member, the mating member having at least one ground conductive pad, at least one signal conductive pad and an upper shield member on an upper side thereof, the electrical connector comprising:

the insulating body is provided with a front end face, and a butt joint groove is arranged backwards from the front end face in a concave mode and used for splicing the butt joint piece;

at least one grounding terminal, disposed on the insulating body, wherein each grounding terminal portion is exposed to the butt-joint groove for contacting the grounding conductive sheet;

at least one signal terminal arranged on the insulating body, wherein each signal terminal part is exposed out of the butt joint groove and is used for contacting the signal conducting strip;

the metal shell covers the insulating body and comprises a top plate positioned above the insulating body, the metal shell is provided with at least one first grounding part connected with the top plate, the first grounding part extends forwards from the top plate and is bent backwards to expose the butt joint groove for contacting with the upper shielding part, at least one second grounding part is formed by extending downwards from the top plate, at least one third grounding part extends backwards from the top plate, one second grounding part and one third grounding part are contacted with the same grounding terminal, and at least one fixing part is extended backwards from the top plate and is matched and fixed with the insulating body.

2. The electrical connector of claim 1, wherein: each of the third ground portions laterally abuts one of the ground terminals in a left-right direction.

3. The electrical connector of claim 1, wherein: the grounding terminals are provided with a plurality of second grounding parts and a plurality of third grounding parts, and each grounding terminal is contacted with one of the second grounding parts and one of the third grounding parts.

4. The electrical connector of claim 3, wherein: wherein one part of the third grounding parts laterally contacts the corresponding grounding terminals to the left, and the other part of the third grounding parts laterally contacts the corresponding grounding terminals to the right.

5. The electrical connector of claim 3, wherein: the top plate extends backwards to form a plurality of fixing parts, and a plurality of second grounding parts and a plurality of third grounding parts are distributed between the two fixing parts in the left-right direction.

6. The electrical connector of claim 1, wherein: each grounding terminal is provided with a main body arranged on the insulating body, a first elastic arm and a second elastic arm extend forwards from the main body, the first elastic arm is provided with a first contact part which is exposed downwards to the butt joint groove and is used for contacting the upper shielding piece downwards, the second elastic arm is provided with a second contact part which is exposed to the butt joint groove and is used for contacting the grounding conducting strip, and the first contact part is positioned in front of the second contact part.

7. The electrical connector of claim 6, wherein: the second grounding part is formed by stamping the top plate, is of a cantilever structure and is downwards abutted to one of the first elastic arms.

8. The electrical connector of claim 7, wherein: the second grounding part extends downwards obliquely from back to front.

9. The electrical connector of claim 6, wherein: the insulating body is provided with a rear end face, the rear end face is concavely provided with a mounting groove from back to front, the mounting groove upwards penetrates through the insulating body, the main body upwards extends an extension arm and stretches into the mounting groove, and the third grounding part is laterally abutted to the extension arm in the left-right direction.

10. The electrical connector of claim 6, wherein: the butt joint part is provided with a lower shielding part positioned at the lower side of the butt joint part, a third elastic arm extends forwards from the main body, and the third elastic arm is provided with a third contact part which is upwards exposed in the butt joint groove and is used for upwards contacting the lower shielding part.

11. The electrical connector of claim 10, wherein: the second contact part and the third contact part are in contact with the upper side and the lower side of the butt joint piece, and the third contact part is located between the first contact part and the second contact part.

12. The electrical connector of claim 10, wherein: the main body is provided with a connecting part, the connecting part is connected with the second elastic arm and the third elastic arm, and the distance between the second contact part and the third contact part in the vertical direction is greater than the size of the connecting part in the vertical direction.

13. The electrical connector of claim 12, wherein: the main part is equipped with a through-hole that runs through in the left and right direction, the through-hole is located the rear of connecting portion and both align in the front and back direction and set up.

14. The electrical connector of claim 1, wherein: and at least one bent part is formed by bending and extending downwards and backwards from the front end of the top plate, and the bent part is clamped and matched with the insulation body.

15. The electrical connector of claim 1, wherein: each downward extension curb plate of roof both sides, the curb plate is equipped with a buckle hole and link up in the left and right sides direction the curb plate, the insulator left and right sides respectively is equipped with a lug of stretching outwards, the lug stretches into the cooperation of buckle hole.

16. The electrical connector of claim 1, wherein: the butt joint device comprises a butt joint groove, two fixing pieces, an insulating body and a buckling arm, wherein the two fixing pieces are positioned on the left side and the right side of the butt joint groove, each fixing piece is provided with a fixing part fixed with the insulating body, the fixing part is bent to extend an extending part, the extending part extends forwards to form the buckling arm, and the buckling arm is provided with a buckling part which extends into the butt joint groove and is used for buckling the butt joint piece.

17. The electrical connector of claim 16, wherein: the insulating body is provided with a top wall positioned above the butt joint groove, a bottom wall positioned below the butt joint groove and a rear wall connecting the top wall and the bottom wall, and the holding part is held on the top wall and extends forwards to exceed the rear wall.

18. The electrical connector of claim 17, wherein: the buckling arm is provided with a bending section which is formed by protruding towards the butt joint groove in the left-right direction.

19. The electrical connector of claim 17, wherein: the fixing part and the buckling arm are located at different heights in the vertical direction.

20. The electrical connector of claim 1, wherein: the grounding terminal is of a blanking structure, and the signal terminal is of a stamping and bending structure.