CN219226707U - Data wire harness line end connector shell - Google Patents

Abstract

The embodiment of the application provides a data wire harness terminal connector shell, which comprises: the plug-in connector comprises a main shell and a plug-in connector inserted in the main shell, wherein a through cavity extending along the length direction is formed in the main shell, the length direction is the length direction of the main shell, a front guide cylinder, a rectangular seat and a rear guide cylinder are sequentially arranged on the main shell along the length direction, the plug-in connector is detachably inserted in an inserting position at the bottom of the rectangular seat, and the plug-in connector and the through cavity form a limiting space in the through cavity for limiting movement of an internal data line connector along the length direction. The data wire connector assembly comprises a data wire and the data wire harness end connector shell. The design can more conveniently enable the line-end data line to be connected with the board-end data line, ensure firm connection of the connector, and further ensure stable connection of the line-end data line and the board-end data line, so that stability of data information transmission can be greatly improved.

Description

Data wire harness line end connector shell

Technical Field

The application relates to the technical field of data transmission cables, in particular to a data wire harness end connector shell of a data wire harness.

Background

The automobile high-speed connector is a widely adopted component in the automobile industry at present and is applied to: navigation system, remote control, car phone, car TV, audio equipment, antenna, etc. In the prior art, in the connection process of the high-speed wire harness connector and the board end connector, the connecting wire itself and the outer shell sleeved outside the connecting wire are easy to move relatively due to vibration or other reasons, and then loose, so that the connecting wire and the board end connector are connected loose or in poor contact, and the quality and stability of high-speed data transmission are affected. Some connectors for connecting data lines are also provided in the prior art, and part of the connectors are provided with elastic sheets, but the elastic sheets are relatively thin and are easily broken in the transportation process.

How to provide a fixing structure for firmly connecting a connecting wire with a shell of the connecting wire is the problem to be solved by the utility model.

Disclosure of Invention

Embodiments of the present application provide a data harness cord end connector housing that addresses one of several of the above-mentioned technical drawbacks.

In order to achieve the above purpose, the present application provides the following technical solutions:

a data harness cord end connector housing, comprising: the main shell is internally provided with a through cavity extending along the length direction, the length direction is the length direction of the main shell, and the main shell is sequentially provided with a front guide cylinder, a rectangular seat and a rear guide cylinder along the length direction;

the plug-in is detachably plugged in the plug-in position at the bottom of the rectangular seat, and the plug-in and the through cavity form a limiting space which is in the through cavity and limits the movement of the internal data line connector along the length direction. The rectangular seat comprises two opposite end faces arranged along the length direction, the two opposite end faces are respectively a front end face connected with the front guide cylinder and a rear end face connected with the rear guide cylinder, four faces are arranged between the two end faces and are respectively a top face, a bottom face and two opposite side faces between the top face and the bottom face, and an arch is arranged on the top face, close to the front guide cylinder.

In any of the above technical solutions, further, an elastic clamping piece is provided on a top surface of one side of the arch close to the rear guide cylinder, and the elastic clamping piece penetrates out through the arch and extends toward the front guide cylinder.

In any of the above technical solutions, further, a buffer block with elasticity protruding toward the bottom surface is disposed on the top surface of the inner side of the arch.

In any of the above technical solutions, further, a lower portion of the elastic clamping piece, which is close to the free end of the front guide cylinder, is of a thinned structure, and a first bulge is arranged on a top surface of the elastic clamping piece, which is close to the free end of the front guide cylinder.

In any of the above technical solutions, further, the elastic clamping piece is provided with a first clamping piece near the top surface of the front guide cylinder, and the first clamping piece is provided between the first bulge and the arch; the first clamping piece comprises a horizontal plane at the top, wherein the horizontal plane is close to the arch direction and is away from the arch direction to be respectively provided with two opposite side surfaces, the direction close to the arch is a vertical side surface, and the direction away from the arch is a slope surface extending obliquely towards the front guide cylinder direction.

In any of the above technical solutions, further, the rear guide cylinder is of a cylindrical structure, a plurality of reinforcing ribs are circumferentially arranged on the outer wall of the rear guide cylinder, the reinforcing ribs extend along the length direction, one end of the length direction of each reinforcing rib is connected to the rectangular base, and the other end of the length direction of each reinforcing rib is rounded.

In any of the above technical solutions, further, the front guide cylinder is in an oval cylinder structure, a first ridge and a second ridge are disposed on the front guide cylinder, the first ridge and the second ridge extend along the length direction, and two end surfaces of the first ridge and the second ridge along the length direction are disposed between the front end surface and a free end surface of the front guide cylinder in the length direction.

In any one of the above technical solutions, further, the through cavity is a first through cavity, a second through cavity and a third through cavity which are sequentially communicated along the length direction, and the first through cavity is disposed in the leading cylinder; the third through cavity is arranged in the rear guide cylinder, and a clamping ring is arranged at the joint of the first through cavity and the second through cavity; the vertical direction internal diameter of second through cavity is shorter than the third through cavity internal diameter, second through cavity top surface sets up the spout, the spout along length direction, be close to the one end of third through cavity be with the opening of third through cavity intercommunication.

In any of the above technical solutions, further, the insert is inserted into the second through cavity from the bottom of the main housing to the top direction;

the plug-in comprises a base, wherein a front end seat is arranged at one end of the base along the length direction, a rear end seat is arranged at the other end of the base along the length direction, and the front end seat is close to the front guide cylinder;

the upper part of the front end seat is of a U-shaped structure and comprises two first plugboards which are symmetrical with each other along the axial direction of the main shell, a second convex circle is arranged on the wall surface of the upper part of the first plugboards, which is far away from the central axial surface, and a pushing piece hole matched with the second convex circle is arranged on the side surface of the rectangular seat;

the upper part of the rear end seat is provided with two second plugboards axially symmetrical in the main shell, two third plugboards axially symmetrical in the main shell are arranged between the two second plugboards, the middle part of the rear end seat is provided with a second clamping piece, and the second clamping piece is arranged between the two third plugboards;

the second clamping piece comprises two opposite vertical surfaces which are arranged in parallel, the vertical surfaces are of right-angled triangle structures, and a slope surface which is close to the vertical surface of the front guide cylinder and extends obliquely to the direction of the rear guide cylinder is arranged between the two vertical surfaces;

the bottom of the rear end seat is provided with a digging groove.

Adopt the data pencil line end connector shell that provides in this application embodiment, compare in prior art, have following technical effect:

the elastic clamping piece structure is better connected with the plate end shell. In addition, because the elastic clamping piece is of a thin structure, the elastic clamping piece is easily pulled apart by upward force in the production or processing process, and the buffer block is arranged in the arch, so that the elastic clamping piece is prevented from being pulled apart after being subjected to upward force, and the whole shell is ensured to be complete and usable.

In addition, this design adopts the double insurance structure when fixed data line head, through snap ring and spout and under the multiple effect of third fastener, blocks the data line front end, again through the second fastener of plug-in components, blocks the data line rear end. Ensuring that the terminals are axially fixed in one area and do not move. The front end connector of the data line is prevented from shaking randomly under any condition, the stability of the connection of the data line is ensured, and the smoothness and stability of data transmission are ensured.

It is to be understood that both the foregoing general description and the following detailed description are for purposes of example and explanation and are not necessarily limiting of the disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of the present disclosure. Meanwhile, the description and drawings are used to explain the principles of the present disclosure.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the prior art, the drawings that are required in the detailed description or the prior art will be briefly described, it will be apparent that the drawings in the following description are some embodiments of the present disclosure, and other drawings may be obtained according to the drawings without inventive effort for a person of ordinary skill in the art. The illustrative embodiments of the present application and their description are for the purpose of explaining the present application and are not to be construed as unduly limiting the present application.

FIG. 1 is a schematic structural view of a data harness cord end connector housing according to an embodiment of the present disclosure;

FIG. 2 is an isometric view of a data harness cord end connector housing according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a front view of a data harness cord end connector housing according to an embodiment of the present disclosure;

FIG. 4 is a schematic cross-sectional view of the embodiment A-A of the present disclosure in FIG. 3;

FIG. 5 is a schematic diagram of an insert in an embodiment of the present disclosure;

FIG. 6 is a schematic cross-sectional view of an insert according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a front view of a data line connector assembly according to an embodiment of the present disclosure;

fig. 8 is a schematic cross-sectional structure of an embodiment B-B of the present disclosure in fig. 7.

Icon: the main shell 100, the rectangular seat 101, the front guide cylinder 102, the rear guide cylinder 103, the pushing piece hole 104, the reinforcing rib 105, the elastic clamping piece 106, the buffer block 107, the arch 108, the first clamping piece 109, the first convex round 110, the first convex ridge 111, the first through cavity 112, the clamping ring 113, the second through cavity 114, the inserting position 115, the third through cavity 116, the sliding groove 117 and the second convex ridge 118,

insert 200, base 201, front end mount 202, first insert 203, second boss 204, second insert 205, third insert 206, second clip 207, key 208,

data line 300, connector 301, terminal 302, third fastener 303, connecting wire 304, cable 305.

Detailed Description

The embodiment of the utility model discloses a data wire harness end connector shell, which aims to solve the problems that the existing data wire is unstable in signal transmission and even broken due to loose connection.

In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following detailed description of exemplary embodiments of the present application is given with reference to the accompanying drawings. It will be apparent that the described embodiments are only some of the embodiments of the present application and are not exhaustive of all embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

Referring to fig. 1-8, in a specific implementation, fig. 1 is a schematic structural diagram of a data wire harness end connector housing according to an embodiment of the disclosure, and fig. 2 is an axial side view of a data wire harness end connector housing according to an embodiment of the disclosure.

A data harness cord end connector housing as shown in fig. 1 and 2, comprising: the main housing 100, the main housing 100 is provided with a through cavity extending along a length direction, and the length direction is a length direction of the main housing 100. The main casing 100 is provided with a front guide 102, a rectangular base 101, and a rear guide 103 in order along the length direction.

The axial direction of the through cavity is parallel to the length direction, and the main shell in the design is an integrally formed shell structure with insulating property, and is made of materials with insulating function. In order to improve the practicability and reduce the cost, PA and PP materials can be selected for production and processing.

The plug-in 200 is detachably inserted into the insertion position 115 at the bottom of the rectangular seat 101. The insert 200 and the through cavity form a limit space in the through cavity for limiting movement of the connector 301 of the internal data line 300 in the length direction.

The main purpose of the design is to be used as a connector housing for a line-end data line, and the primary purpose of the design is to ensure that the housing and the line-end data line are relatively fixed, and the line-end data line cannot axially move in the housing due to gaps. In order to achieve the above purpose, the design is designed with a structure capable of limiting the front end and the rear end of the corresponding component of the line-end data line.

Fig. 3 is a schematic front view of a data wire harness end connector housing according to an embodiment of the present disclosure, and fig. 4 is a schematic cross-sectional view of an embodiment A-A of the present disclosure in fig. 3.

As shown in fig. 3 and 4, the wire end data wire is pushed by the rear guide 103 of the housing in the direction of the front guide 102, and after being pushed to the corresponding position, the front end face of the terminal is engaged with the rear end face of the snap ring 113. And then the plug-in is inserted into the plugging position 115 at the bottom of the rectangular seat 101, and the second clamping piece in the plug-in 200 is abutted against the rear end face of the terminal, so that the limit is completed.

In some embodiments, rectangular seat 101 includes two opposing end surfaces disposed lengthwise, the two opposing end surfaces being perpendicular to the axis. The two opposite end surfaces are respectively a front end surface connected with the front guide cylinder 102 and a rear end surface connected with the rear guide cylinder 103. Four surfaces are arranged between the two end surfaces, namely a top surface, a bottom surface and two opposite side surfaces between the top surface and the bottom surface, and the two side surfaces are parallel to the axis. An arch 108 is arranged on the top surface near the front guide cylinder 102, an elastic clamping piece 106 is arranged on the top surface of one side of the arch 108 near the rear guide cylinder 103, and the elastic clamping piece 106 penetrates out through the arch 108 and extends towards the front guide cylinder 102.

As shown in fig. 2, the end surface of the arch adjacent to the front guide 102 is flush with the front end surface of the rectangular base 101, which is designed to better connect the data harness wire end connector housing with the board end connector housing. When the wire end connecting shell and the plate end connecting shell are connected, the plate end connecting shell is also provided with a structure similar to the arch 108, and when the wire end connecting shell and the plate end connecting shell are connected, the arch and the arch are propped against each other to form a protective cover structure.

The inner upper surface of the arch 108 is provided with a buffer block 107 which is protruded towards the bottom surface and has elasticity.

The lower part of the elastic clamping piece 106 near the free end of the front guide cylinder 102 is in a thinned structure. The resilient clip 106 is provided with a first boss 110 adjacent the top surface of the free end of the front barrel 102.

The elastic clamping member 106 is provided with a first clamping member 109 near the top surface of the front guide cylinder 102, and the first clamping member 109 is arranged between the first convex circle 110 and the arch 108. The first clamping member 109 comprises a horizontal plane at the top, and the horizontal plane is provided with two opposite sides near the direction of the arch 108 and away from the arch 108, wherein the direction near the arch 108 is a vertical side, and the direction away from the arch 108 is a slope extending obliquely towards the front guide cylinder 102.

As can be seen from the above embodiments, a sleeve capable of sleeving the front guide cylinder is disposed at a position corresponding to the board-end connector, a socket groove matched with the elastic clamping member 106 is disposed at an upper portion of the sleeve, and a hole clamped with the first clamping member 109 is disposed at an upper portion of the socket groove. The connection is completed by the strip hole and the first clamping piece 109 on the elastic clamping piece 106. If the connection needs to be released, the first clamping piece 109 is pressed down to be separated from the limit of the strip hole, so that the purpose of releasing the connection is achieved.

In some embodiments, the rear guide cylinder 103 is of a cylindrical structure, the outer wall of the rear guide cylinder 103 is circumferentially provided with a plurality of reinforcing ribs 105, the reinforcing ribs 105 extend in the length direction, one end of the reinforcing ribs 105 in the length direction is connected to the rectangular base 101, and the other end of the reinforcing ribs 105 in the length direction is rounded.

The design of the reinforcing rib strengthens the connection firmness of the rear guide cylinder and the rectangular seat on one hand. On the other hand, when the rear guide cylinder is matched with other sleeved parts, the reinforcing rib is used as a supporting piece to play a role in reinforcing connection and support.

In some embodiments, the front guide cylinder 102 is in an oval cylinder structure, the front guide cylinder 102 is provided with a first protruding edge 111 and a second protruding edge 118, the first protruding edge 111 and the second protruding edge 118 extend along the length direction, and two end faces of the first protruding edge 111 and the second protruding edge 118 along the length direction are arranged between the front end face and the free end face of the front guide cylinder 102 along the length direction.

As shown in fig. 3, the second ribs are disposed on the bottom surface of the front guide cylinder, and the two first ribs are disposed on the left and right sides of the front guide cylinder and are staggered. The convex edge plays a guiding role, and when the front guide cylinder is clamped with the board end connector shell, the convex edge is spliced with the corresponding guide groove. On one hand, the limiting plate end connector shell and the data wire harness end connector shell rotate relatively, and on the other hand, the limiting plate plays a role in supporting in the sleeving process.

In addition, the front guide cylinder is designed into a kidney-hole type cylinder structure, and the front guide cylinder and a part sleeved on the front guide cylinder are basically prevented from rotating relatively.

In some embodiments, the through cavities are a first through cavity 112, a second through cavity 114, and a third through cavity 116 that are sequentially in communication along the length direction, the first through cavity 112 being disposed within the preamble 102. The third through cavity 116 is arranged in the rear guide cylinder 103, and a clamping ring 113 is arranged at the joint of the first through cavity 112 and the second through cavity 114. The inner diameter of the second through cavity 114 in the vertical direction is shorter than that of the third through cavity 116, a sliding groove 117 is arranged on the top surface of the second through cavity 114, and one end, close to the third through cavity 116, of the sliding groove 117 along the length direction is an opening communicated with the third through cavity 116. The insert 200 is inserted into the second through cavity 114 from the bottom of the main housing 100 in a top direction. The data line head is arranged in the through cavity, and when the leading barrel is spliced with the plate end data line connector, the data lines at two ends are spliced simultaneously. Fig. 5 is a schematic structural diagram of an insert in an embodiment of the disclosure, and fig. 6 is a schematic sectional structural diagram of an insert in an embodiment of the disclosure.

In some embodiments, the insert 200 shown in fig. 5 and 6 includes a base 201, with a front end seat 202 provided at one end of the base 201 in the length direction. The other end of the base 201 in the length direction is provided with a rear end seat, and the front end seat 202 is close to the front guide cylinder 102.

The upper part of the front end seat 202 is of a U-shaped structure and comprises two first plugboards 203 which are axially symmetrical in the main shell 100, a second convex circle 204 is arranged on the wall surface of the upper part of the first plugboards 203, which is far away from the middle shaft surface, and a pushing piece hole 104 matched with the second convex circle 204 is arranged on the side surface of the rectangular seat 101.

The upper part of the rear end seat is provided with two second plugboards 205 which are axially symmetrical in the main shell 100, two third plugboards 206 which are axially symmetrical in the main shell 100 are arranged between the two second plugboards 205, the middle part of the rear end seat is provided with a second clamping piece 207, and the second clamping piece 207 is arranged between the two third plugboards 206.

The second clamping member 207 includes two opposite vertical surfaces, the two vertical surfaces are arranged in parallel, the vertical surfaces are in a right triangle structure, and a vertical surface close to the front guide cylinder 102 and a slope surface extending obliquely to the direction of the rear guide cylinder 103 are included between the two vertical surfaces.

The bottom of the rear end seat is provided with a digging groove 208, when the plug-in is required to be pulled out, the left and right second bulges 204 are pushed to be separated from the pushing piece hole 104, and force is applied to the digging groove, so that the plug-in is separated from the main shell.

In some embodiments, a data line 300 structural component is also provided. FIG. 7 is a schematic diagram of a front view of a data line connector assembly according to an embodiment of the present disclosure; fig. 8 is a schematic cross-sectional structure of an embodiment B-B of the present disclosure in fig. 7. As shown in fig. 7 and 8, the housing of the line terminal connector 301 includes any one of the above-mentioned components, and further includes a data line 300, wherein the head of the data line 300 is inserted into the through cavity, and a limit structure for limiting the movement of the head of the data line 300 along the length direction is disposed in the housing of the line terminal connector 301. The data wire is clamped in the data wire harness end connector shell to limit the axial movement of the data wire.

The data line 300 sequentially comprises a connector 301, a terminal 302, a connecting wire 304 and a cable 305, wherein the connector 301 is arranged in the first through cavity 112, the terminal 302 is clamped in the second through cavity 114, two end faces of the terminal 302 in the length direction are pressed against the clamping ring 113, the other end face is pressed against the second clamping piece 207, a third clamping piece 303 is arranged at the position, close to the top surface of the second through cavity 114, of the terminal 302, and the third clamping piece 303 is pressed against the end face, close to the front guide cylinder 102, of the sliding groove 117.

Because the data wire harness end connector housing has the technical effects described above, the data wire structure assembly with the data wire harness end connector housing should also have corresponding technical effects.

Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.

In the description of the present disclosure, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present disclosure, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art in the specific context.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims (9)

1. A data harness cord end connector housing, comprising: a main housing, wherein a through cavity extending along the length direction is arranged in the main housing, the length direction is the length direction of the main housing, a front guide cylinder, a rectangular seat and a rear guide cylinder are sequentially arranged along the length direction of the main housing,

the plug-in is detachably inserted into the insertion position at the bottom of the rectangular seat, the plug-in and the through cavity form a limiting space which is arranged in the through cavity and used for limiting the movement of the internal data line connector along the length direction,

the rectangular seat comprises two opposite end faces arranged along the length direction, the two opposite end faces are respectively a front end face connected with the front guide cylinder and a rear end face connected with the rear guide cylinder, four faces are arranged between the two end faces and are respectively a top face, a bottom face and two opposite side faces between the top face and the bottom face, and an arch is arranged on the top face, close to the front guide cylinder.

2. The data line harness cord end connector housing of claim 1, wherein the top surface of the arch on the side adjacent to the rear guide is provided with a resilient clip that extends in the direction of the front guide through the arch.

3. The data line harness cord end connector housing of claim 1, wherein said arch inner top surface is provided with a resilient bumper protruding toward said bottom surface.

4. The data line harness cord end connector housing of claim 2, wherein the lower portion of the resilient clip adjacent the free end of the front guide barrel is of a thinned configuration, and the resilient clip adjacent the top surface of the free end of the front guide barrel is provided with a first bulge.

5. The data harness cord end connector housing of claim 4, wherein the resilient clip is provided adjacent a top surface of the front guide cylinder with a first clip disposed between the first boss and the arch; the first clamping piece comprises a horizontal plane at the top, wherein the horizontal plane is close to the arch direction and is away from the arch direction to be respectively provided with two opposite side surfaces, the direction close to the arch is a vertical side surface, and the direction away from the arch is a slope surface extending obliquely towards the front guide cylinder direction.

6. The data line harness cord end connector housing of claim 1, wherein the rear guide cylinder is of a cylindrical structure, a plurality of reinforcing ribs are circumferentially arranged on the outer wall of the rear guide cylinder, the reinforcing ribs extend along the length direction, one ends of the reinforcing ribs in the length direction are connected to the rectangular base, and the other ends of the reinforcing ribs in the length direction are rounded.

7. The data harness cord end connector housing of claim 1, wherein the leading barrel is of an oval barrel structure, a first ridge and a second ridge are arranged on the leading barrel, the first ridge and the second ridge extend along the length direction, and two end faces of the first ridge and the second ridge along the length direction are arranged between the front end face and a free end face of the leading barrel in the length direction.

8. The data harness cord end connector housing of any one of claims 1 or 2, wherein the through cavity is a first through cavity, a second through cavity and a third through cavity that are sequentially communicated in a length direction, the first through cavity being provided in the preamble cylinder; the third through cavity is arranged in the rear guide cylinder, and a clamping ring is arranged at the joint of the first through cavity and the second through cavity; the vertical direction internal diameter of second through cavity is shorter than the third through cavity internal diameter, second through cavity top surface sets up the spout, the spout along length direction, be close to the one end of third through cavity be with the opening of third through cavity intercommunication.

9. The data harness cord end connector housing of claim 8, wherein the insert is inserted into the second through cavity from a bottom of the main housing in a top direction;

the plug-in comprises a base, wherein a front end seat is arranged at one end of the base along the length direction, a rear end seat is arranged at the other end of the base along the length direction, and the front end seat is close to the front guide cylinder;

the upper part of the front end seat is of a U-shaped structure and comprises two first plugboards which are symmetrical with each other along the axial direction of the main shell, a second convex circle is arranged on the wall surface of the upper part of the first plugboards, which is far away from the central axial surface, and a pushing piece hole matched with the second convex circle is arranged on the side surface of the rectangular seat;

the upper part of the rear end seat is provided with two second plugboards axially symmetrical in the main shell, two third plugboards axially symmetrical in the main shell are arranged between the two second plugboards, the middle part of the rear end seat is provided with a second clamping piece, and the second clamping piece is arranged between the two third plugboards;

the second clamping piece comprises two opposite vertical surfaces which are arranged in parallel, the vertical surfaces are of right-angled triangle structures, and a slope surface which is close to the vertical surface of the front guide cylinder and extends obliquely to the direction of the rear guide cylinder is arranged between the two vertical surfaces;

the bottom of the rear end seat is provided with a digging groove.

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