CN213151055U - Butt-joint type wiring terminal - Google Patents

Abstract

The utility model relates to a dock binding post, including first grafting casing: the clamping device comprises a first insertion shell, a second insertion shell and a clamping mechanism, wherein the first insertion shell is provided with a clamping plate extending axially and a plurality of first axial through grooves extending axially; a second plug-in housing: it includes that the second inserts the shell, the second insert in the shell, with the corresponding position in first axial through groove forms the second axial cavity, the second insert on the shell, with the joint board corresponding position forms the joint groove, first grafting casing with the second grafting casing passes through the joint board with the joint in joint groove is connected and is formed grafting structure. The utility model discloses a corresponding grafting structure has been set to owing to leading to groove with split type first axial with the second axial cavity to the structure, is about to split type butt-joint structural in the space design of binding post inside for form the contact between first current conducting plate and the second current conducting plate of leading to groove in locating first axial respectively and second axial, realize the inside electric connection structure of binding post.

Description

Butt-joint type wiring terminal

Technical Field

The utility model relates to a wire connecting device especially relates to a dock binding post.

Background

Binding post is very extensive because the convenience that its wire was connected, in the application in fields such as electric power engineering, mechanical equipment, though there is a great deal of binding post's structure among the prior art, however, from the angle of independently innovating, when realizing that the wire is conveniently connected, how to embody the convenience of binding post itself and also become the key development direction of each enterprise, the utility model discloses a binding post has carried out brand-new design, research and development to the binding post in the aspect of the simplification of assembly process and production efficiency's promotion.

Disclosure of Invention

An object of the utility model is to provide a simple structure, assemble convenient dock binding post.

In order to achieve the above object, the utility model discloses a dock binding post, including first grafting casing: the clamping device comprises a first insertion shell, wherein the first insertion shell is provided with an axially extending clamping plate and a plurality of axially extending first axial through grooves, and a wedge-shaped clamping part is formed at the top end of the clamping plate; the wiring terminal further comprises a second plug-in housing: it includes that the second inserts the shell, the second insert in the shell, with the corresponding position in first axial through groove forms the second axial cavity, the second insert on the shell, with the joint board corresponding position forms the joint groove, first grafting casing with the second grafting casing passes through the joint board with the joint in joint groove is connected and is formed grafting structure.

The utility model discloses in, when carrying out the opposite direction grafting to first grafting casing and second grafting casing, for guaranteeing the smooth and easy of pegging graft each other between first axial through groove and the second axial cavity, its further structure sets up as follows: the upper position of the first axial through groove forms a top wall, an axial groove is formed in the top wall, a top plate is formed in the upper position of the second axial cavity, and a guide plate which extends longitudinally downwards and is matched with the axial groove is arranged on the top plate.

As a further specific structural description of the present invention, the first plug-in housing further includes a first end housing forming a joint with the first plug-in housing in the axial direction, a first conductive plate is installed in the first axial through groove, a first axial insertion hole is formed in the first end housing at a position corresponding to the first axial through groove, an elastic sheet is disposed between the first axial insertion hole and the first axial through groove in an abutting manner, and a lower end edge of the elastic sheet forms an elastic abutting relationship with the first conductive plate; the second plug-in shell further comprises a second end shell which is clamped with the second plug-in shell in the axial direction, a second conductive plate which is in butt joint with the first conductive plate is arranged in the second axial cavity, a second axial insertion hole is formed in the second end shell, the elastic sheet is arranged between the second axial insertion hole and the second axial cavity, and the lower end edge of the elastic sheet is elastically abutted to the second conductive plate.

The present invention provides a structure in which, when a first plug housing and a second plug housing are plugged into a single structure, the specific structure of the contact between the first conductive plate and the second conductive plate inside the first plug housing and the second plug housing is described as follows: the position that first current conducting plate is last, be close to the second and insert the shell forms wavy grafting portion, and the terminal position of wavy grafting portion forms the protruding edge of oblique downwardly extending, on the second current conducting plate, with protruding corresponding tip position along the form perk tongue that extends in the slope, first current conducting plate with the second current conducting plate pass through protruding edge with the face contact between the perk tongue forms butt joint structure.

Furthermore, a first boss extending towards the first plug housing direction is arranged on the first end housing and located on the peripheral side of the first axial plug hole, a second boss extending towards the second plug housing direction is arranged on the second end housing and located on the peripheral side of the second axial plug hole, end faces of the first boss and the second boss form an oblique guide face, specifically, an acute angle smaller than or equal to 90 degrees is formed between the oblique guide face and the line incoming direction of the first axial plug hole and the second axial plug hole, then the elastic sheet is arranged on the oblique guide face in an abutting mode, and the acute angle structure has the obvious effect that when a lead is inserted, the lead can be easily bounced off the elastic sheet, and the lead is tightly pressed on the first conductive plate or the second conductive plate through restoring force of the elastic sheet.

In the utility model, as the further concrete structure description to the spring plate as follows: the elastic sheet is provided with a transverse clamping sheet and a contact sheet extending downwards from one side edge of the transverse clamping sheet in an inclined way, the elastic sheet is in close contact with the inclined guide surface through the contact sheet, the front and back side edges of the transverse clamping sheet are provided with clamping parts extending along the same direction, axial clamping grooves are formed in the first insertion shell and the second insertion shell and correspond to the clamping parts, the elastic sheet is in clamping connection with the axial clamping grooves through the clamping parts to form axial limiting, the structure of the elastic sheet can be respectively axially limited in the first insertion shell and the second insertion shell through the transverse clamping sheet on the elastic sheet, and can be used in close contact with the inclined guide surface through the contact sheet on the elastic sheet, meanwhile, the elastic sheet of the structure is respectively opposite to the first end shell and the second end shell, namely, the connecting (protruding) positions of the transverse clamping sheet and the contact sheet are respectively positioned above the first axial insertion hole and the second axial insertion hole, only the first end shell and the second end shell are provided with the open holes corresponding to the connection (protrusion) positions, and electricity testing work at any time and any place can be achieved in the using process of the wiring terminal.

As a further configuration of the present invention, the tail end of the wavy insertion portion of the first conductive plate forms a first plate-shaped body, the front and rear edges of the first plate-shaped body form first protruding edges extending along the body, the first protruding edge forms a first axial deep groove at a position corresponding to the first protruding edge in the axial direction, the first protruding edge is adapted to the first axial deep groove, the first boss forms a first axial limiting groove at a position below the first axial insertion hole, the first plate-shaped body of the first conductive plate has a first axial insertion portion extending into the first axial limiting groove and forming an axial limit in the first axial limiting groove, the structure greatly improves the installation convenience of the first insertion housing, and only the first conductive plate needs to be inserted into the first axial through groove from one axial side of the first insertion housing, until the first convex edge forms butt joint at the bottom of the first axial deep groove, then the elastic sheet is placed in any position between the first axial through groove and the first end shell, and the first end shell is further buckled on the first plug shell, so that the first plug shell can be completely assembled; a plurality of second axial through grooves communicated with the second axial cavity are formed in one side, close to the second end shell, of the second plug shell, a second plate body extending axially is formed in the position, located at the tail end of the warping tongue, of the second conductive plate, second convex edges extending along the body of the second plate body are formed at the front side and the rear side of the second plate body, second axial deep grooves are formed in the second axial through grooves in the axial direction and correspond to the second convex edges, the second convex edges are matched with the second axial deep grooves, a second axial limiting groove is formed in the second boss and located below the second axial plug hole, the second conductive plate is provided with a second plug-in part extending into the second axial limiting groove and forming axial limiting in the second axial limiting groove, and similarly, the structure also greatly improves the assembly efficiency of the second plug shell, only need insert the second current conducting plate to the logical groove of second axial from the axial one side of second plug-in shell, until the protruding edge of second forms the butt in the bottom position of the deep groove of second axial, then equally arrange the preforming in the second plug-in shell and the second hold the optional position between the shell, further hold the shell lock with the second and insert the shell on the second, alright realize the assembly of second plug-in shell.

As will be apparent to those skilled in the art from the above-described technical solution improvements of the prior art, the main advantageous effects of the present invention are realized by simplifying the assembly process, that is, the assembly process is as follows: the first step is as follows: the first current-conducting plate is axially inserted into the first insertion shell, and then the first end shell is clamped at the end part of the first insertion shell, namely the first insertion shell is assembled; the second step is that: the second conductive plate is axially inserted into the second insertion shell, and then the second end shell is clamped at the end part of the second insertion shell, namely the second insertion shell is assembled; the third step: carry out dock joint formula integral type structure with first grafting casing and second grafting casing, the first axial logical groove of its inside forms the grafting with second axial cavity simultaneously, realizes that the first current conducting plate in the logical groove of first axial and the second current conducting plate in the second axial cavity realize physical contact. Therefore, the utility model discloses a binding post when realizing its connecting wire's reliability, also very big simplification the assembly process, promoted assembly efficiency.

Drawings

Fig. 1 is a perspective view of the present invention;

fig. 2 is an exploded perspective view of the first and second plug housings of fig. 1;

FIG. 3 is a perspective exploded view of further all of the components of FIG. 2;

fig. 4 is a front view of the connecting terminal of the present invention;

FIG. 5 is a schematic cross-sectional view taken along A-A of FIG. 5;

fig. 6 is a schematic perspective view of a first insert case of the present invention;

fig. 7 is a perspective view of a second insert shell in the present invention;

fig. 8 is a schematic perspective view of the first end housing (second end housing) of the present invention.

Detailed Description

Fig. 1 to 8 show that the present embodiment uses a docking type terminal, as can be seen from fig. 1 in conjunction with fig. 2, which includes a first plug housing 1: as is further apparent from fig. 3, the first plug housing 1 includes a first plug housing 10, shown in fig. 6, the first plug housing 10 has an axially extending snap plate 11 and an axially extending first axial through groove 12, and a top end of the snap plate 11 forms a wedge-shaped snap portion 110; as further shown in fig. 2, the connection terminal of the present embodiment further includes a second plug housing 2: as can be seen from fig. 3 in conjunction with fig. 7, the second plug housing 2 includes a second plug housing 20, a second axial cavity 22 is formed in the second plug housing 20 at a position corresponding to the first axial through slot 12, a clamping groove 21 is formed on the second inserting shell 20 at a position corresponding to the clamping plate 11, the first inserting housing 1 and the second inserting housing 2 are connected by the clamping connection plate 11 and the clamping groove 21 to form an inserting structure, specifically, in order to facilitate the mold opening, as is apparent from fig. 1 and 2, the clamping groove 21 has a transverse insertion hole 210 and a longitudinal opening 211 communicating with the transverse insertion hole 210, and a clamping cross bar 212 is formed above the transverse insertion hole 210, the clamping plate 11 passes through the transverse insertion hole 210, and the wedge-shaped clamping part 110 at the top end of the wedge-shaped clamping part is axially clamped with the clamping cross bar 212 to form the plug-in connection.

As can be seen from fig. 2 in conjunction with fig. 3, fig. 6 and fig. 7, in the present embodiment, when the first plug housing 1 and the second plug housing 2 are plugged in opposite directions, in order to ensure smooth plugging between the first axial through slot 12 and the second axial cavity 22, the structure is further set as follows: a top wall 120 is formed above the first axial through groove 12, an axial open groove 121 is formed on the top wall 120, a top plate 220 (fig. 5 shows that the top plate 220 is also the bottom of the clamping groove 21) is formed above the second axial cavity 22, and a guide plate 221 which extends longitudinally and downwards and is matched with the axial open groove 121 is arranged on the top plate 220.

As a description of a further specific structure of the connection terminal of this embodiment, fig. 1, fig. 2 and fig. 3 show that the first plug housing 1 further includes a first end shell 13 which is clamped with the first plug shell 10 in the axial direction, a first conductive plate 14 is installed in the first axial through groove 12, a first axial insertion hole 130 is opened on the first end shell 13 at a position corresponding to the first axial through groove 12, an elastic piece 3 is disposed between the first axial insertion hole 130 and the first axial through groove 12 in an abutting manner, and a lower end edge of the elastic piece 3 forms an elastic abutting manner with the first conductive plate 14; the second plug-in housing 2 further includes a second end shell 23 clamped with the second plug-in housing 20 in the axial direction, a second conductive plate 24 butted with the first conductive plate 14 is installed in the second axial cavity 22, a second axial insertion hole 230 is opened on the second end shell 23, the other spring plate 3 is installed between the second axial insertion hole 230 and the second axial cavity 22, and the lower end edge of the spring plate 3 is elastically abutted to the second conductive plate 24; as can be seen from fig. 3, in the present embodiment, as is apparent from fig. 3 in conjunction with fig. 8, although the first end housing 13 and the second end housing 23 are described by their respective names, the structure is the same.

Fig. 4 shows, in conjunction with fig. 5, that in this embodiment, as the first plug housing 1 and the second plug housing 2 are plugged together to form an integral structure, the specific structure of the physical contact (i.e., the physical contact between the first conductor plate 14 and the second conductor plate 24, which is formed directly face-to-face, face-to-point or point-to-point) formed between the first conductor plate 14 and the second conductor plate 24 is described as follows: fig. 3 shows that a wavy insertion part 140 is formed on the first conductive plate 14 at a position close to the second insertion housing 20, a protruding edge 1400 extending obliquely downward is formed at a distal end position of the wavy insertion part 140, a raised tongue 240 extending obliquely upward is formed on the second conductive plate 24 at an end position corresponding to the protruding edge 1400, and the first conductive plate 14 and the second conductive plate 24 form a butt joint structure by surface contact between the protruding edge 1400 and the raised tongue 240.

In this embodiment, as is apparent from fig. 3 in conjunction with fig. 5 and 8, the first end shell 13, which is located on the peripheral side of the first axial insertion hole 130, has a first boss 131 extending toward the first insertion shell 10, the second end shell 23, which is located on the peripheral side of the second axial insertion hole 230, has a second boss 231 extending toward the second insertion shell 20, the end surfaces of the first boss 131 and the second boss 231 form an oblique guide surface 1310, specifically, the oblique guide surface 1310 forms an acute angle smaller than 90 ° with the incoming line direction of the first axial insertion hole 130 and the second axial insertion hole 230, and then the pressing piece 3 is closely arranged on the oblique guide surface 1310, which has a significant effect that when a wire is inserted, the wire can easily spring open the pressing piece 3 and tightly press the wire against the first conductive plate 14 or the second conductive plate 24 by the restoring force of the pressing piece 3, thereby realizing the electrical connection.

Fig. 3 further shows, in conjunction with fig. 5, a further specific structure of the striking plate 3 in the present embodiment as follows: the said spring plate 3 has a horizontal card 30 and a contact plate 31 extending from one side edge of the horizontal card 30 in a downward slant way, the said spring plate 3 is adjacent to the slant guiding surface 1310 through the contact plate 31, the front and back side edges of the horizontal card 30 have a clamping part 300 extending along its body, the axial clamping groove 1200 is formed on the first and second inserting shells 10 and 20 corresponding to the clamping part 300, the said spring plate 3 forms an axial position limitation through the clamping connection between the clamping part 300 and the axial clamping groove 1200, the structure of the spring plate 3 can be limited axially in the first and second inserting shells 1 and 2 through the horizontal card 30 thereon, and can also realize the purpose of being adjacent to the slant guiding surface 1310 through the contact plate 31 thereon, and it can be known from fig. 2 and 3, the spring plate 3 of this structure is opposite to the first and second end shells 13 and 23, namely, the cross connecting (protruding) positions of the transverse clamping sheet 30 and the contact sheet 31 are respectively positioned at the upper positions of the first axial jack 130 and the second axial jack 230, and only the first end shell 13 and the second end shell 23 are provided with the open holes 1230 corresponding to the cross connecting (protruding) positions, so that the electricity testing work can be realized at any time and any place in the using process of the wiring terminal.

As can be seen from fig. 3 in conjunction with fig. 5, fig. 6 and fig. 7, as a further configuration of this embodiment, the tail end of the wavy insertion portion 140 of the first conductive plate 14 forms a first plate-shaped body 141, the front and rear side edges of the first plate-shaped body 141 form first protruding edges 1410 extending along the body thereof, a first axial deep groove 122 is formed in the first axial through groove 12 at a position corresponding to the first protruding edge 1410 in the axial direction, the first protruding edge 1410 is fitted with the first axial deep groove 122, a first axial limiting groove 1311 is formed on the first boss 131 at a position below the first axial insertion hole 130, the first plate-shaped body 141 of the first conductive plate 14 has a first axial insertion portion 1411 extending into the first axial limiting groove 1311 and forming an axial limiting in the first axial limiting groove 1311, and this structure greatly improves the installation convenience of the first insertion housing 1, the first plug-in housing 1 can be assembled by inserting the first conductive plate 14 into the first axial through groove 12 from one axial side of the first plug-in housing 10 until the first protruding edge 1410 abuts against the bottom of the first axial deep groove 122, then placing the spring plate 3 at any position between the first axial through groove 12 and the first end housing 13, and further buckling the first end housing 13 on the first plug-in housing 10; a plurality of second axial through grooves 223 communicated with the second axial cavity 22 are formed on one side of the second plug housing 20 close to the second end housing 23, a second plate-shaped body 241 extending axially is formed on the second conductive plate 24 at the position of the tail end of the raised tongue 240, second convex edges 2410 extending along the body are formed at the front and rear side edges of the second plate-shaped body 241, a second axial deep groove 2230 is formed in the second axial through groove 223 at the position corresponding to the second convex edge 2410 in the axial direction, the second convex edge 2410 is matched with the second axial deep groove 2230, a second axial limit groove 2310 is formed on the second boss 2410 at the position below the second axial plug hole 230, the second conductive plate 24 has a second plug portion 2411 extending into the second axial limit groove 2310 and forming an axial limit in the second axial limit groove 2310, and similarly, the structure also greatly improves the assembly efficiency of the second plug-in housing 2, and only the second conductive plate 24 needs to be inserted into the second axial through groove 223 from one axial side of the second plug-in housing 20 until the second convex edge 2410 forms abutting joint at the bottom of the second axial deep groove 2230, then the same spring plate 3 is placed at any position between the second plug-in housing 20 and the second end housing 23, and the second end housing 23 is further buckled on the second plug-in housing 20, so that the assembly of the second plug-in housing 2 can be realized.

The basic principles and main features of the invention and the advantages of the invention have been shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and the above-described embodiments and the description only illustrate the principle of the present invention, and that there are various changes and modifications of the present invention, which are introduced by the spirit of the technical solution of the present invention and fall within the scope of the claims of the present invention. The scope of the invention is defined by the appended claims, description, drawings, and equivalents thereof.

Claims (10)

1. A butt-joint type wiring terminal is characterized in that: comprises that

A first plug-in housing: the clamping device comprises a first insertion shell, wherein the first insertion shell is provided with an axially extending clamping plate and a plurality of axially extending first axial through grooves, and a wedge-shaped clamping part is formed at the top end of the clamping plate;

a second plug-in housing: it includes that the second inserts the shell, the second insert in the shell, with the corresponding position in first axial through groove forms the second axial cavity, the second insert on the shell, with the joint board corresponding position forms the joint groove, first grafting casing with the second grafting casing passes through the joint board with the joint in joint groove is connected and is formed grafting structure.

2. A butted connecting terminal as claimed in claim 1, wherein: the upper position of the first axial through groove forms a top wall, an axial groove is formed in the top wall, a top plate is formed in the upper position of the second axial cavity, and a guide plate which extends longitudinally downwards and is matched with the axial groove is arranged on the top plate.

3. A butted connecting terminal as claimed in claim 2, wherein: the first plug-in shell further comprises a first end shell which is clamped with the first plug-in shell in the axial direction, a first current-conducting plate is arranged in the first axial through groove, a first axial jack is arranged on the first end shell and corresponds to the first axial through groove, an elastic sheet is arranged between the first axial jack and the first axial through groove in a butting mode, and the lower end edge of the elastic sheet is elastically abutted to the first current-conducting plate; the second plug-in shell further comprises a second end shell which is clamped with the second plug-in shell in the axial direction, a second conductive plate which is in butt joint with the first conductive plate is arranged in the second axial cavity, a second axial insertion hole is formed in the second end shell, an elastic sheet is arranged between the second axial insertion hole and the second axial cavity in a butt joint mode, and the lower end edge of the elastic sheet is in elastic butt joint with the second conductive plate.

4. A butted connecting terminal as claimed in claim 3, wherein: the position that first current conducting plate is last, be close to the second and insert the shell forms wavy grafting portion, and the terminal position of wavy grafting portion forms the protruding edge of oblique downwardly extending, on the second current conducting plate, with protruding corresponding tip position along the form perk tongue that extends in the slope, first current conducting plate with the second current conducting plate pass through protruding edge with the face contact between the perk tongue forms butt joint structure.

5. A butted connecting terminal as claimed in claim 3, wherein: the first end shell is provided with a first boss extending towards the first plug shell direction on the periphery of the first axial plug hole, the second end shell is provided with a second boss extending towards the second plug shell direction on the periphery of the second axial plug hole, the end faces of the first boss and the second boss form an oblique guide face, and the elastic pressing sheet is adjacently arranged on the oblique guide face.

6. A butted connecting terminal as claimed in claim 4, wherein: the first end shell is provided with a first boss extending towards the first plug shell direction on the periphery of the first axial plug hole, the second end shell is provided with a second boss extending towards the second plug shell direction on the periphery of the second axial plug hole, the end faces of the first boss and the second boss form an oblique guide face, and the elastic pressing sheet is adjacently arranged on the oblique guide face.

7. A butted connecting terminal as claimed in claim 5, wherein: the elastic sheet is provided with a transverse card and a contact piece extending downwards in an inclined mode from one side edge of the transverse card, the elastic sheet is adjacent to the inclined guide surface through the contact piece, the front side edge and the rear side edge of the transverse card are provided with clamping portions extending along the same direction, axial clamping grooves are formed in positions, corresponding to the clamping portions, of the first inserting shell and the second inserting shell, and the elastic sheet is connected with the axial clamping grooves in a clamping mode to form axial limiting.

8. A butted connecting terminal as claimed in claim 6, wherein: the elastic sheet is provided with a transverse card and a contact piece extending downwards from one side edge of the transverse card in an inclined mode, the elastic sheet is adjacent to the inclined guide surface through the contact piece, the front side edge and the rear side edge of the transverse card are provided with clamping portions extending along the same direction, axial clamping grooves are formed in positions, corresponding to the clamping portions, of the first inserting shell and the second inserting shell, and the elastic sheet is connected with the axial clamping grooves in a clamping mode to form axial limiting.

9. A butted connecting terminal as claimed in claim 7, wherein: the tail end of the wavy insertion part of the first conductive plate forms a first plate-shaped body, the front side edge and the rear side edge of the first plate-shaped body form a first convex edge extending along the body of the first plate-shaped body, a first axial deep groove is formed in the first axial through groove and in the position corresponding to the first convex edge in the axial direction, the first convex edge is matched with the first axial deep groove, a first axial limiting groove is formed on the first boss and below the first axial insertion hole, and the first plate-shaped body of the first conductive plate is provided with a first axial insertion part extending into the first axial limiting groove and forming axial limiting in the first axial limiting groove; the second insert on the shell, be close to one side of second end shell form a plurality ofly with the second axial cavity communicates logical groove, on the second current conducting plate, be located the position of perk tongue tail end and form the second plate type body of axial extension, the both sides border forms along the protruding edge of second that its body was in same direction as extending around this second plate type body, second axial logical inslot, in axial direction with the protruding corresponding position in edge of second forms the second axial deep groove, the protruding edge of second with the adaptation of second axial deep groove, on the second boss, be located the below position of second axial jack forms the second axial spacing groove, the second current conducting plate has and extends into second axial spacing groove and form the spacing second grafting portion of axial in this second axial spacing inslot.

10. A butted connecting terminal as claimed in claim 8, wherein: the tail end of the wavy insertion part of the first conductive plate forms a first plate-shaped body, the front side edge and the rear side edge of the first plate-shaped body form a first convex edge extending along the body of the first plate-shaped body, a first axial deep groove is formed in the first axial through groove and in the position corresponding to the first convex edge in the axial direction, the first convex edge is matched with the first axial deep groove, a first axial limiting groove is formed on the first boss and below the first axial insertion hole, and the first plate-shaped body of the first conductive plate is provided with a first axial insertion part extending into the first axial limiting groove and forming axial limiting in the first axial limiting groove; the second insert on the shell, be close to one side of second end shell form a plurality ofly with the second axial cavity communicates logical groove, on the second current conducting plate, be located the position of perk tongue tail end and form the second plate type body of axial extension, the both sides border forms along the protruding edge of second that its body was in same direction as extending around this second plate type body, second axial logical inslot, in axial direction with the protruding corresponding position in edge of second forms the second axial deep groove, the protruding edge of second with the adaptation of second axial deep groove, on the second boss, be located the below position of second axial jack forms the second axial spacing groove, the second current conducting plate has and extends into second axial spacing groove and form the spacing second grafting portion of axial in this second axial spacing inslot.

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