Plug-in assembly for cable penetration

Abstract

The invention belongs to the technical field of cable crossing equipment, and discloses a plugging assembly for cable crossing, which comprises a junction box fixedly connected to the side surface of an oil pipe and an upper plug plugged with the junction box, the junction box is connected with an underground cable, and the upper plug is connected with a ground cable. An underground cable and a ground cable are connected through the junction box and the upper plug to form a passage; the junction box and the upper plug are located in an annular space between the oil pipe and the sleeve, the junction box is integrally in a long strip shape, the section of the junction box is in a sector ring shape, the inner side face, making contact with the oil pipe, of the junction box is concave inwards, and therefore it is guaranteed that the junction box can be completely attached to the oil pipe. By arranging the junction box and the upper plug, the junction box with the sector-ring-shaped cross section can be tightly attached and fixed to the outer wall of the oil pipe and can also adapt to the annular space between the oil pipe and the sleeve, and the long and narrow upper plug is matched with the junction box; the defect that a conventional cable penetrating device cannot be installed due to the fact that the annulus face is specific in shape and small in area is fundamentally overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of cable crossing equipment, and in particular relates to a plug-in assembly for cable crossing. Background Art

[0002] With the development of my country's oil exploration and development, the development of offshore oil wells and low-pressure oil wells has become more and more vigorous, and the corresponding electric submersible pump integrated oil production technology has also been rapidly developed. In the existing technology, a cable crosser is usually used to connect the cable, and the ground power is transmitted to the downhole electric submersible pump, thereby driving the electric submersible pump to lift the crude oil to the ground along the oil pipe, wherein the oil pipe and the cable crosser are independently arranged in the casing. For wellheads with smaller sizes, due to the narrow annulus between the oil pipe and the casing, it is impossible to reserve enough installation space for the cable crosser, resulting in the inability to install and use conventional cable crossers normally. Summary of the invention

[0003] In view of this, the present invention intends to provide a plug-in assembly for cable crossing to solve the technical problem in the prior art that the annular surface between the oil pipe and the casing is narrow, resulting in insufficient installation space for the cable crossing device.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: A plug assembly for cable crossing, comprising a junction box fixedly connected to the side of an oil pipe and an upper plug plugged with the junction box, the junction box is connected to a downhole cable, the upper plug is connected to a ground cable, the downhole cable and the ground cable are connected through the junction box and the upper plug to form a passage; the junction box and the upper plug are located in an annular space between the oil pipe and the casing, the junction box is in an elongated shape as a whole and has a fan-shaped cross section, the inner side surface of the junction box in contact with the oil pipe is concave, so as to ensure that the junction box and the oil pipe can be completely fitted; Further, the junction box includes a main body shell, the upper end and the lower end of the main body shell are respectively provided with an upper sealing plate and a lower sealing block, the upper sealing plate is provided with three evenly distributed positioning holes, the three positioning holes are arranged in an arc shape and partially surround the outer side of the oil pipe, a positioning cylinder is provided in the positioning hole, the positioning cylinder and the upper sealing plate are connected and fixed by a locking sleeve, an insulating connecting cylinder is threadedly connected in the positioning cylinder, and a conductive cylinder and a first insulating conductive rod connected to each other are sequentially provided in the insulating connecting cylinder along the vertical direction; Furthermore, the lower end of the positioning tube extends to the inside of the main body shell, the upper end of the positioning tube is exposed above the upper sealing plate, and the upper end of the positioning tube is provided with an external thread, and a limiting step is formed at the upper end of the insulating connection tube, and the limiting step is abutted against the outer end surface of the positioning tube to achieve positioning of the insulating connection tube; Furthermore, the conductive tube is threadedly connected to the insulating connection tube, and the outer wall of the conductive tube is in close contact with the inner wall of the insulating connection tube, and the upper end surface of the conductive tube is flush with the bottom surface of the plug interface, so that the conductive tube is connected to the plug interface, and the upper and lower ends of the conductive tube are respectively provided with a first accommodating space and a second accommodating space, and the first accommodating space and the second accommodating space are connected through a connecting channel; Further, the upper end of the first insulating conductive rod is located in the insulating connecting cylinder, the lower end of the first insulating conductive rod extends to the outside of the insulating connecting cylinder, the first insulating conductive rod includes a first conductive rod, the plug-in section at the upper part of the first conductive rod is inserted into the second accommodating space, a threaded hole is axially opened at the center position of the end face of the plug-in section of the first conductive rod, the rod body of the tightening screw passes through the connecting channel and is threadedly connected to the first conductive rod, the tightening screw nut is located in the first accommodating space and abuts against the bottom surface of the first accommodating space, and the first insulating conductive rod and the conductive cylinder are fixed by the tightening screw; Furthermore, a first coaxial connecting tube is provided at the lower end of the first conductive rod, the opening direction of the first connecting tube is away from the first conductive rod, and the underground three-phase armored cable penetrates the entire lower sealing block at the center position of the end face of the lower sealing block in the vertical direction and is dispersed into three independent underground cable lines, and the end of the free end of the underground cable line forms a stripping head and is inserted into the first connecting tube to achieve the connection between the junction box and the underground cable; Furthermore, one end of the first insulating conductive rod close to the first connecting tube and one end of the downhole cable close to the first connecting tube are both covered with a first insulating reinforcement layer; Further, the upper plug includes a connecting tube, the upper end of the connecting tube is sleeved with a joint, the openings at both ends of the joint are hollow cylindrical, the upper end of the connecting tube is inserted into the opening at the lower end of the joint and is threadedly connected, the lower end of the connecting tube is sleeved with a connecting screw cover, the opening at the lower end of the connecting tube is convex to form an annular step, the connecting screw cover is limited by the annular step, the part of the connecting screw cover that exceeds the connecting tube includes a threaded connection section located in the middle of the connecting screw cover and a sealing section located at the bottom of the connecting screw cover, wherein an internal thread is opened in the threaded connection section in the middle of the connecting screw cover; Further, a second insulating conductive rod is provided at the lower end of the inner cavity of the connecting tube, and the second insulating conductive rod includes a second conductive rod coaxial with the connecting tube, the lower end of the second conductive rod exceeds the connecting screw cover and is formed with a pin at the lower end, and a coaxial second connecting cylinder is provided at the end of the upper end of the second conductive rod, and the opening direction of the second connecting cylinder is away from the second conductive rod, and the ground cable passes through the joint and extends into the connecting tube, and a stripping head is formed at the end thereof and inserted into the second connecting cylinder, thereby realizing the connection between the ground cable and the upper plug; Furthermore, the second insulating conductive rod is divided into an upper section, a middle section and a lower section due to different sizes of the second insulating layer. A gap is left between the upper section of the second insulating conductive rod and the cavity wall of the inner cavity of the connecting tube, the middle section of the second insulating conductive rod is threadedly connected to the connecting tube, and the lower section of the second insulating conductive rod is exposed at the lower end of the connecting tube and a gap is left between the lower section of the second insulating conductive rod and the connecting screw cover.

[0005] The beneficial effects of the present invention are: Compared with the prior art, by setting up the junction box and the upper plug, on the one hand, the junction box with a fan-shaped cross-section can not only be fixed tightly to the outer wall of the oil pipe, but also adapt to the annular space between the oil pipe and the casing. The narrow upper plug cooperates with the junction box, which fundamentally solves the problem that the conventional cable crosser cannot be installed due to the specific shape of the annular surface and the small area. In addition, the junction box is supported and fixed by the oil pipe to prevent the junction box from colliding with the inner oil pipe or the outer casing during oil production, causing damage; on the other hand, the junction box and the upper plug are stably connected, have good power transmission performance, can replace conventional cable crossers, and have a simple structure, which can be quickly installed. In addition, the overall structure of the plug-in assembly is compact, and multiple sealing structures are provided in the junction box and the upper plug, which can effectively prevent the intrusion of well fluid or gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 This is an overall schematic diagram of a junction box in Embodiment 1 of the present invention; Figure 2 Schematic diagram of the upper sealing plate in the first embodiment of the present invention; Figure 3 is a cross-sectional view of a junction box in Embodiment 1 of the present invention; Figure 4 for Figure 3 The enlarged view of A1 in the middle; Figure 5 is a cross-sectional view of the conductive tube in the first embodiment of the present invention; Figure 6 It is an overall schematic diagram of the upper plug in the first embodiment of the present invention; Figure 7 It is a cross-sectional view of the upper plug in the first embodiment of the present invention.

[0007] The following are marked in the accompanying drawings: Junction box 1, main shell 101, upper sealing plate 102, positioning hole 1021, lower sealing block 103, injection hole 1031, positioning cylinder 104, insulating connecting cylinder 105, plug interface 1051, conductive cylinder 106, first accommodating space 1061, second accommodating space 1062, connecting channel 1063, first insulating conductive rod 107, first conductive rod 1071, first connecting cylinder 1072, first insulating layer 1073, first insulating reinforcement layer 108, armored cable 109, downhole cable 110, sealing molding 111, clamping plate 112, tightening screw 113, upper plug 2, connecting pipe 201, joint 202, connecting screw cover 203, second insulating conductive rod 204, second conductive rod 2041, second connecting cylinder 2042, pin 2043, ground cable 205, steel pipe 206, ferrule joint 207, second insulating reinforcement layer 208. DETAILED DESCRIPTION

[0008] Embodiment 1, see Figure 1-Figure 7 .

[0009] A plug-in assembly for cable crossing includes a junction box 1 fixedly connected to the side of an oil pipe and an upper plug 2 plugged into the junction box 1. The junction box 1 is connected to a downhole cable, and the upper plug 2 is connected to a ground cable. The downhole cable and the ground cable are connected through the junction box 1 and the upper plug 2 to form a passage.

[0010] like Figure 1 As shown, the junction box 1 is in the shape of a long strip as a whole and has a fan-shaped cross section, that is, the inner side surface of the junction box 1 in contact with the oil pipe is concave, so as to ensure that the junction box 1 and the oil pipe can fit completely. The junction box 1 includes a main body shell 101 with a hollow interior and openings at both ends. An upper sealing plate 102 and a lower sealing block 103 are welded at the upper opening and the lower opening of the main body shell 101, respectively, and the upper sealing plate 102 and the lower sealing block 103 are used to seal the two ends of the main body shell 101. It should be explained in detail that in this embodiment, the upper surface of the upper sealing plate 102 is flush with the upper opening of the main body shell 101, and the lower sealing block 103 extends downward and forms a certain taper. The formed taper can play a guiding role, which is convenient for positioning and installation of the junction box 1.

[0011] The upper sealing plate 102 is provided with three evenly distributed positioning holes 1021, which are arranged in an arc shape and partially surround the outer side of the oil pipe. A positioning cylinder 104 is provided in the positioning hole 1021. The positioning cylinder 104 and the upper sealing plate 102 are connected and fixed by a locking sleeve. The lower end of the positioning cylinder 104 extends to the inside of the main body shell 101, and the upper end of the positioning cylinder 104 is exposed above the upper sealing plate 102, and an external thread is provided at the upper end of the positioning cylinder 104. The positioning cylinder 104 is internally threaded with an insulating connecting cylinder 105, and a limited step is formed at the upper end of the insulating connecting cylinder 105. The limited step is abutted against the outer end surface of the positioning cylinder 104 to position the insulating connecting cylinder 105. Two O-type sealing structures are provided between the positioning cylinder 104 and the insulating connecting cylinder 105. This is a prior art and will not be described in detail.

[0012] A plug-in port 1051 is formed in the cavity at the upper end of the insulating connecting tube 105, and a conductive tube 106 and a first insulating conductive rod 107 connected to each other are arranged in sequence in the vertical direction in the insulating connecting tube 105, wherein the conductive tube 106 is threadedly connected to the insulating connecting tube 105 and the outer wall of the conductive tube 106 is in close contact with the inner wall of the insulating connecting tube 105, and the upper end surface of the conductive tube 106 is flush with the bottom surface of the plug-in port 1051, so that the conductive tube 106 is connected to the plug-in port 1051. A first accommodating space 1061 and a second accommodating space 1062 are respectively provided at the upper and lower ends of the conductive tube 106. The first accommodating space 1061 and the second accommodating space 1062 are connected via a connecting channel 1063. The axes of the first accommodating space 1061, the second accommodating space 1062 and the connecting channel 1063 coincide. In addition, it should be noted that the inner diameter of the connecting channel 1063 is smaller than the inner diameter of the first accommodating space 1061, and elastic electrode rings are provided in both the first accommodating space 1061 and the second accommodating space 1062.

[0013] The upper end of the first insulating conductive rod 107 is located in the insulating connection tube 105, and the lower end of the first insulating conductive rod 107 extends to the outside of the insulating connection tube 105. The first insulating conductive rod 107 includes a first conductive rod 1071 coaxial with the second accommodating space 1062, the diameter of the first conductive rod 1071 is the same as the inner diameter of the second accommodating space 1062, and the plug-in section of the upper part of the first conductive rod 1071 is inserted into the second accommodating space 1062, and a threaded hole is opened axially at the center position of the end face of the plug-in section of the first conductive rod 1071. The shaft of the tightening screw 113 passes through the connecting channel 1063 and is threadedly connected to the first conductive rod 1071. The nut of the tightening screw 113 is located in the first accommodating space 1061 and abuts against the bottom surface of the first accommodating space 1061. The first insulating conductive rod 107 and the conductive tube 106 are fixed by the tightening screw 113.

[0014] A coaxial first connecting tube 1072 is welded to the lower end of the first conductive rod 1071. Figure 4 As shown, the opening direction of the first connecting tube 1072 is away from the first conductive rod 1071, and the diameter of the first connecting tube 1072 is larger than the diameter of the first conductive rod 1071. The exposed section of the first conductive rod 1071 is also covered with a first insulating layer 1073. In this embodiment, the material of the first insulating layer 1073 is polyetheretherketone (PEEK). The upper first insulating layer 1073 is in contact with the insulating connecting tube 105, and three O-shaped sealing structures are provided between the two.

[0015] The underground three-phase armored cable 109 penetrates the entire lower sealing block 103 at the center position of the end face of the lower sealing block 103 in the vertical direction and is dispersed into three independent underground cable lines 110. The free end of the underground cable line 110 forms a stripping head and is inserted into the first connecting tube 1072 to realize the connection between the junction box 1 and the underground cable.

[0016] like Figure 4 As shown, one end of the first insulating conductive rod 107 close to the first connecting tube 1072 and one end of the downhole cable 110 close to the first connecting tube 1072 are covered with a first insulating reinforcement layer 108. In this embodiment, the first insulating reinforcement layer 108 includes 3 layers, wherein the inner layer is a polytetrafluoroethylene pressure-sensitive tape, the middle layer is a polytetrafluoroethylene pressure-sensitive tape, and the outer layer is a cold shrink tube. The first insulating reinforcement layer 108 can not only further improve the insulation sealing effect of the connection between the first insulating conductive rod 107 and the downhole cable 110, but also ensure the stability of the connection and enhance the integrity between the two.

[0017] A vertical injection hole 1031 is provided in the lower sealing block 103. After the overall assembly of the junction box 1 is completed, epoxy resin is injected into the main housing 101 through the injection hole 1031 to fill the internal space of the main housing 101, thereby forming a solid sealing molding 111. On the one hand, the main housing 101 can be supported to effectively enhance the deformation resistance of the main housing 101. On the other hand, the three downhole cables 110 and the matching positioning cylinder 104 and the components therein are separated to prevent interference between them.

[0018] like Figure 3 As shown, a limiting member is provided on the side of the main housing 101, and the limiting member includes 4 clamping plates 112 evenly distributed on both sides of the main housing 101, and a gap is left between the clamping plates 112 on the same side to form a limiting groove. In this embodiment, two groups of limiting members are provided and there is a gap between them, and a binding band (such as a steel tie) passes through the limiting grooves on both sides to bind and fix the junction box 1 and the oil pipe.

[0019] like Figure 6 , Figure 7 As shown, the upper plug 2 includes a connecting tube 201 with a circular cross section. In this embodiment, the upper end of the connecting tube 201 is sleeved with a joint 202, and the openings at both ends of the joint 202 are hollow cylindrical. The upper end of the connecting tube 201 is inserted into the opening at the lower end of the joint 202 and is threadedly connected. An O-type sealing structure is provided at the connection between the two. The lower end of the connecting tube 201 is sleeved with a connecting screw cover 203, and the lower end opening of the connecting tube 201 is convex to form an annular step, and the connecting screw cover 203 is limited by the annular step. The portion of the connecting screw cover 203 that exceeds the connecting tube 201 includes a threaded connection section located in the middle of the connecting screw cover 203 and a sealing section located at the bottom of the connecting screw cover 203, wherein an internal thread is provided in the threaded connection section in the middle of the connecting screw cover 203.

[0020] A second insulating conductive rod 204 is provided at the lower end of the inner cavity of the connecting tube 201. The second insulating conductive rod 204 includes a second conductive rod 2041 coaxial with the connecting tube 201. The lower end of the second conductive rod 2041 exceeds the connecting screw cap 203 and is formed with a pin 2043 at the lower end. A coaxial second connecting cylinder 2042 is welded to the upper end of the second conductive rod 2041. The diameter of the second connecting cylinder 2042 is greater than the diameter of the second conductive rod 2041 and the opening direction of the second connecting cylinder 2042 is away from the second conductive rod 2041. The second conductive rod 2041 is covered with a second insulating layer 2044 except for the pin 2043. The second insulating conductive rod 204 is divided into an upper section, a middle section and a lower section due to the different sizes of the second insulating layer 2044. There is a gap between the upper section of the second insulating conductive rod 204 and the wall of the inner cavity of the connecting tube 201, the middle section of the second insulating conductive rod 204 is threadedly connected to the connecting tube 201, and two O-shaped sealing structures are provided at the connection between the two, and the lower section of the second insulating conductive rod 204 is exposed at the lower end of the connecting tube 201 and there is a gap between the lower section of the second insulating conductive rod 204 and the connecting screw cover 203.

[0021] The ground cable 205 passes through the connector 202 and extends into the connecting tube 201. A stripping head is formed at the end thereof and inserted into the second connecting tube 2042, thereby realizing the connection between the ground cable 205 and the upper plug 2. One end of the ground cable 205 away from the second connecting tube 2042 is wrapped with a steel tube 206. A gap is left between the steel tube 206 and the stripping head of the ground cable 205. A ferrule joint 207 is provided on the outer sleeve of the steel tube 206. The ground cable 205 is connected, fixed and sealed to the upper end opening of the connector 202 through the ferrule joint 207.

[0022] The end of the second insulating conductive rod 204 close to the joint 202 and the end of the ground cable 205 away from the steel pipe 206 are covered with a second insulating reinforcement layer 208. In this embodiment, the second insulating reinforcement layer 208 includes two layers, wherein the inner layer is a polyperfluoroethylene propylene pressure-sensitive tape and the outer layer is a polytetrafluoroethylene pressure-sensitive tape. The second insulating reinforcement layer 208 can effectively insulate and seal the connection between the ground cable 205 and the second connecting tube 2042, and improve the strength and stability of the connection. On the other hand, it can also effectively protect the second insulating conductive rod 204 and the ground cable 205.

[0023] During installation, first, assemble the junction box 1 and the upper plug 2 respectively, then, align the upper plug 2 with the junction box 1 and tighten the upper plug 2, that is, the external thread at the upper end of the positioning tube 104 cooperates with the internal thread in the middle threaded connection section of the connecting screw cover 203. During the tightening process, the pin 2043 passes through the upper end plug port 1051 of the insulating connecting tube 105 and is inserted into the first accommodating space 1061 at the upper end of the conductive tube 106. At the same time, the lower section of the second insulating conductive rod 204 is inserted into the plug port 1051 of the insulating connecting tube 105, thereby completing the connection between the junction box 1 and the upper plug 2; finally, the junction box 1 and the oil pipe are tied and fixed. In addition, it should be further explained that two O-type sealing structures are provided between the lower section of the second insulating conductive rod 204 and the plug port 1051 of the insulating connecting tube 105, and an O-type sealing structure is provided between the bottom sealing section of the connecting screw cover 203 and the positioning tube 104.

[0024] By providing the junction box 1 and the upper plug 2, on the one hand, the junction box 1 with a fan-shaped cross-section can not only be tightly fixed to the outer wall of the oil pipe, but also can adapt to the annular space between the oil pipe and the casing. The narrow upper plug 2 cooperates with the junction box 1 to fundamentally solve the problem that the conventional cable crosser cannot be installed due to the specific shape of the annular surface and the small area. In addition, the junction box 1 is supported and fixed by the oil pipe to prevent the junction box from colliding with the inner oil pipe or the outer casing during oil production and causing damage; on the other hand, the junction box 1 and the upper plug 2 are stably connected, have good power transmission performance, can replace conventional cable crossers, and have a simple structure and can be quickly installed.

[0025] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A plug-in assembly for cable crossing, characterized in that: It includes a junction box fixedly connected to the side of the oil pipe and an upper plug plugged into the junction box. The junction box is connected to the downhole cable, and the upper plug is connected to the ground cable. The downhole cable and the ground cable are connected through the junction box and the upper plug to form a passage. The junction box and the upper plug are located in the annular space between the oil pipe and the casing. The junction box is in the shape of a long strip as a whole and has a fan-shaped cross section. The inner side surface of the junction box in contact with the oil pipe is concave, thereby ensuring that the junction box and the oil pipe can fit completely.

2. The plug-in assembly for cable crossing according to claim 1, characterized in that: The junction box includes a main shell body, and an upper sealing plate and a lower sealing block are respectively provided at the upper and lower ends of the main shell body. Three evenly distributed positioning holes are opened on the upper sealing plate. The three positioning holes are arranged in an arc shape and partially surround the outer side of the oil pipe. A positioning cylinder is provided in the positioning hole. The positioning cylinder and the upper sealing plate are connected and fixed by a locking sleeve. An insulating connecting cylinder is threadedly connected to the inner thread of the positioning cylinder. A conductive cylinder and a first insulating conductive rod connected to each other are sequentially provided in the insulating connecting cylinder along the vertical direction.

3. The plug-in assembly for cable crossing according to claim 2, characterized in that: The lower end of the positioning tube extends to the inside of the main shell, the upper end of the positioning tube is exposed above the upper sealing plate, and an external thread is provided on the upper end of the positioning tube. A limiting step is formed on the upper end of the insulating connecting tube, and the limiting step is abutted against the outer end surface of the positioning tube to position the insulating connecting tube.

4. The plug-in assembly for cable crossing according to claim 3, characterized in that: The conductive tube is threadedly connected to the insulating connecting tube and the outer wall of the conductive tube is in close contact with the inner wall of the insulating connecting tube. The upper end surface of the conductive tube is flush with the bottom surface of the plug interface, so that the conductive tube is connected to the plug interface. The upper and lower ends of the conductive tube are respectively provided with a first accommodating space and a second accommodating space, and the first accommodating space and the second accommodating space are connected through a connecting channel.

5. The plug-in assembly for cable crossing according to claim 4, characterized in that: The upper end of the first insulating conductive rod is located in the insulating connecting cylinder, and the lower end of the first insulating conductive rod extends to the outside of the insulating connecting cylinder. The first insulating conductive rod includes a first conductive rod, and the plug-in section on the upper part of the first conductive rod is inserted into the second accommodating space. A threaded hole is axially opened at the center position of the end face of the plug-in section of the first conductive rod. The rod body of the tightening screw passes through the connecting channel and is threadedly connected to the first conductive rod. The tightening screw nut is located in the first accommodating space and abuts against the bottom surface of the first accommodating space. The first insulating conductive rod and the conductive cylinder are fixed by the tightening screw.

6. The plug-in assembly for cable crossing according to claim 5, characterized in that: A coaxial first connecting tube is provided at the lower end of the first conductive rod, and the opening direction of the first connecting tube is away from the first conductive rod. The underground three-phase armored cable penetrates the entire lower sealing block at the center position of the end face of the lower sealing block in the vertical direction and is dispersed into three independent underground cable lines. The end of the free end of the underground cable line forms a stripping head and is inserted into the first connecting tube to realize the connection between the junction box and the underground cable.

7. The plug-in assembly for cable crossing according to claim 6, characterized in that: One end of the first insulating conductive rod close to the first connecting tube and one end of the downhole cable close to the first connecting tube are both covered with a first insulating reinforcement layer.

8. The plug-in assembly for cable passage according to any one of claims 1 to 7, characterized in that: The upper plug includes a connecting tube, the upper end of which is sleeved with a joint, the openings at both ends of the joint are hollow cylindrical, the upper end of the connecting tube is inserted into the opening at the lower end of the joint and is threadedly connected, the lower end of the connecting tube is sleeved with a connecting screw cover, the opening at the lower end of the connecting tube bulges outward to form an annular step, the connecting screw cover is limited by the annular step, the part of the connecting screw cover that protrudes beyond the connecting tube includes a threaded connection section located in the middle of the connecting screw cover and a sealing section located at the bottom of the connecting screw cover, wherein an internal thread is opened in the threaded connection section in the middle of the connecting screw cover.

9. The plug-in assembly for cable crossing according to claim 8, characterized in that: A second insulating conductive rod is provided at the lower end of the internal cavity of the connecting tube, and the second insulating conductive rod includes a second conductive rod coaxial with the connecting tube, the lower end of the second conductive rod extends beyond the connecting screw cover and a pin is formed at the lower end, and a coaxial second connecting tube is provided at the end of the upper end of the second conductive rod, and the opening direction of the second connecting tube is away from the second conductive rod. The ground cable passes through the joint and extends into the connecting tube, and a stripping head is formed at its end and inserted into the second connecting tube, thereby realizing the connection between the ground cable and the upper plug.

10. The plug-in assembly for cable crossing according to claim 9, characterized in that: The second insulating conductive rod is divided into an upper section, a middle section and a lower section due to the different sizes of the second insulating layer. There is a gap between the upper section of the second insulating conductive rod and the cavity wall of the inner cavity of the connecting tube, the middle section of the second insulating conductive rod is threadedly connected to the connecting tube, and the lower section of the second insulating conductive rod is exposed at the lower end of the connecting tube and there is a gap between the lower section of the second insulating conductive rod and the connecting screw cover.

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