Optical fiber butt joint structure and heavy load connector

Abstract

The invention provides an optical fiber butt joint structure and a heavy-load connector, the optical fiber butt joint structure comprises a plug and a socket, the plug comprises a head housing and a spline housing, the head housing comprises a through mounting hole, the spline housing is integrally cylindrical, a plugging end is taken as a front end, a rear part of the spline housing is accommodated in the through mounting hole of the head housing, and the rear part of the spline housing is accommodated in the through mounting hole of the head housing. The front part penetrates out of the head shell; the socket comprises a socket shell, the front section of the socket shell is cylindrical, the rear section of the socket shell is of a structure internally provided with a through mounting hole, and the front section of the socket shell and the front part of the spline shell are oppositely inserted through a matched circular interface; the plug port of the socket housing is provided with a housing guide surface. By changing the shell structures of the plug and the socket in the optical fiber butt joint structure, the optical fiber butt joint structure can be installed in a rectangular installation cavity of an original installation frame, and installation of the optical fiber butt joint structure is achieved; and meanwhile, the heavy-load connector can resist high vibration and impact by adjusting an optical fiber butt joint structure.

Description

Technical Field

[0001] The invention relates to the technical field of heavy-duty connectors, and in particular to an optical fiber docking structure and a heavy-duty connector. Background Art

[0002] Due to its modular design, heavy-duty connectors are widely used in rail transit, heavy-duty machinery, hot runners, power automation and other industrial fields that are subject to harsh environments. They are mainly used for the transmission of electricity, data and signals. In terms of data and signal transmission, the current heavy-duty connectors are mostly RJ45 data connectors and signal connectors for connecting signal cables. The disadvantage is that the transmission of electrical signals will be affected by electromagnetic interference, and there will be risks of unstable signal transmission or even signal distortion. In addition, the transmission capacity of electrical signals is limited. When the capacity of transmitted information is large or the transmission distance is long, there will be risks of delay or distortion in signal transmission.

[0003] Optical fiber transmission has the characteristics of strong anti-interference ability and large capacity, which can be used to solve the above problems. Therefore, heavy-duty connectors using optical fiber transmission are widely used. However, the current heavy-duty connectors have the following problems that need to be solved: (1) The optical fiber heavy-duty connector generally includes a mounting frame and an optical fiber docking structure adapted to be mounted thereon, such as the attached patent document of the utility model patent with publication number CN218919299U. Figure 1 and the attached utility model patent with publication number CN202352910U Figure 1 It can be seen that the cross-section of the installation cavity for installing the optical fiber docking structure in the installation frame is a rectangular structure, which requires that the cross-section of the shell of the optical fiber docking structure that matches it is also a rectangular structure. At the same time, the shell of the optical fiber docking structure is mostly a square structure made by die-casting. The matching tolerance range between the shells is large and cannot meet the high-precision plug-in requirements. When the shell structure of the optical fiber docking structure is changed to a circular shape to reduce the matching tolerance, there is a problem that the circular structure cannot adapt to the rectangular installation cavity in the original installation frame.

[0004] (2) Since heavy-duty connectors may have processing errors and installation errors during processing, forced installation will damage the fiber optic docking structure. Therefore, the fiber optic docking structure is required to have X-, Y-, and Z-direction floating self-alignment functions in the installation frame. At the same time, since the fiber optic docking structure has high requirements for positioning accuracy, the plug and socket in the fiber optic docking structure are required to have redundant dimensions when plugged in.

[0005] (3) Since heavy-duty connectors are mostly used outdoors in harsh environments such as high vibration and impact, extremely high requirements are placed on the mechanical life, vibration and impact resistance, and dirt resistance of the optical fiber docking structure.

[0006] Therefore, there is an urgent need for a heavy-duty connector that can adapt to the rectangular installation cavity of the original installation frame, has strong resistance to high vibration, impact and dirt, has high guiding accuracy, and is suitable for harsh outdoor environments. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a fiber optic docking structure and a heavy-duty connector. By changing the shell structure of the plug and the socket in the fiber optic docking structure, the installation of the fiber optic docking structure can be achieved while being compatible with the original electrical interface without changing the connector on the device end. At the same time, by adjusting the fiber optic docking structure, the heavy-duty connector can withstand high vibration and impact.

[0008] The technical solution adopted by the present invention to solve the above technical problems is: In one aspect, the present invention discloses an optical fiber docking structure, comprising: The plug comprises a head shell and a spline shell, wherein the head shell comprises a through mounting hole, the spline shell is cylindrical as a whole, with the plug end as the front end, the rear part of the spline shell is accommodated in the through mounting hole of the head shell, and the front part passes through the outside of the head shell; the spline shell is provided with an insulating component, and the insulating component is provided with an optical fiber contact; The socket comprises a socket shell, the front section of the socket shell is cylindrical, the rear section is a structure containing a through mounting hole, the front section of the socket shell and the front section of the spline shell are plugged into each other through a matching circular interface; an insulating component is arranged inside the socket shell, and an optical fiber contact is installed inside the insulating component; The optical fiber docking structure can be movably installed on the device to be installed, and the plug-in port of the seat shell or spline shell is provided with a shell guide surface to guide the matching plug and socket to be plugged in and realize accurate docking of the optical fiber.

[0009] Furthermore, the shell guide surface is an annular inclined surface; the annular inclined surface is a continuous inclined surface extending along the circumferential direction, or is surrounded by a plurality of inclined surfaces distributed at intervals along the circumferential direction.

[0010] Furthermore, at least one anti-misinsertion key or positioning groove is provided on the front portion of the spline housing at a position for docking with the seat housing to prevent the spline housing and the seat housing from being misinserted.

[0011] Furthermore, the anti-error insertion key is in a bullet shape with a narrow front end and a wide rear end.

[0012] Furthermore, a flange is provided on the outer peripheral surface of the spline housing, and the flange cooperates with the head housing to limit the position of the spline housing.

[0013] Furthermore, a limit key or a limit groove is provided at the front end of the flange to prevent the spline housing from rotating in the head housing.

[0014] Furthermore, an annular spacer section exists along the axial direction between the limit key and the anti-mistake insertion key, or between the limit groove and the positioning groove.

[0015] Furthermore, an axial spring, a limit block and a fastening nut are provided in the head shell. The limit block and the fastening nut are arranged at the rear of the spline shell and are limited by the inner wall of the through mounting hole. The front end of the axial spring is against the flange, and the rear end is against the limit block.

[0016] Furthermore, a plurality of optical fiber installation holes are provided in the insulating component, and the optical fiber contact pieces are installed in the corresponding optical fiber installation holes through the top stop positioning structure.

[0017] Furthermore, the top stop positioning structure includes a retaining spring fixed in the optical fiber installation hole and a limiting sleeve fixedly installed on the outer wall of the optical fiber contact piece. The retaining spring and the limiting sleeve cooperate to position the optical fiber contact piece.

[0018] Furthermore, the insulating component includes, from front to back, an insulator and an insulating cover plate connected by positioning pins.

[0019] Furthermore, the optical fiber docking structure also includes a sealing structure, which includes a first-level sealing structure arranged at the tail of the spline shell and / or the seat shell for sealing the optical fiber contact, and a second-level sealing structure arranged at the front end of the socket for plugging and cooperating with the plug-in end of the plug to seal the interface between the two in the plugged state.

[0020] Furthermore, the first-level sealing structure comprises a wire sealing body arranged behind the insulating component, the wire sealing body is glued and fixed to the insulating component, and a drum-shaped step hole capable of firmly clamping the optical fiber contact is provided inside the wire sealing body.

[0021] Furthermore, the second-level sealing structure is an interface sealing gasket arranged in front of the insulating component in the socket, and a conical elastic protrusion is arranged on the front end surface of the interface sealing gasket at a position corresponding to the installation of the optical fiber contact piece.

[0022] Furthermore, the head shell and the seat shell are both made of metal.

[0023] On the other hand, the present invention discloses a heavy-duty connector, including a mounting frame and an optical fiber docking structure mounted in the mounting frame.

[0024] Furthermore, a boss is provided on the outer wall of the head shell and / or the seat shell, and a groove which matches the gap with the boss is provided on the inner wall of the mounting frame to ensure that the optical fiber docking structure can float along the mounting frame.

[0025] Beneficial effects: (1) In the present invention, the entire head shell and the rear section of the seat shell are designed to be a square structure, which can be installed in the rectangular installation cavity of the original installation frame without adjusting the structure of the installation frame.

[0026] (2) The present invention provides a shell guide surface on the plug-in port of the seat shell or spline shell, providing a redundant dimension. Under the premise that the optical fiber docking structure is movably installed on the device to be installed, it can guide the matching head seat for plug-in, thereby improving the plug-in accuracy.

[0027] (3) A flange is provided on the outer peripheral surface of the spline housing of the present invention, and the flange cooperates with the head housing to form a positioning surface. A limit key is provided at the front end of the flange. After assembly, the key prevents the spline housing from rotating in the head housing, thereby playing an anti-rotation role.

[0028] (4) The present invention provides an anti-mistake insertion key on the front portion of the spline housing, and a positioning groove cooperating therewith is provided on the front portion of the seat housing. The anti-mistake insertion key and the positioning groove cooperate with each other to realize the precise positioning function of the plug and the socket and the blind plug-in function.

[0029] (5) There is a complete annular spacer between the limit key of the present invention and one of the anti-mistake insertion keys. This annular spacer requires extremely high processing accuracy due to the advantage of the round shaft. After insertion, it can form an accurate two-point support with the "anti-mistake insertion key-positioning groove" feature, and the positioning is accurate, preventing the swing of the plug and the socket from affecting the optical performance of the product, and has high reliability in extremely high vibration and impact mechanical environments. (6) The present invention uses a fastening nut and a limiting block to limit the axial spring, so that the fixed surface can be a rigid docking surface, and the axial spring will not move due to clearance displacement and affect the docking.

[0030] (7) The optical fiber contact of the present invention is positioned in the optical fiber installation hole of the insulating component by a top stop positioning structure. When a removal tool is used to act on the top stop positioning structure, the optical fiber contact can be easily removed from the insulating component, thereby greatly improving the maintainability of the connector and having single-point maintainability of the optical cable.

[0031] (8) The optical fiber docking structure of the present invention also includes a sealing structure. The sealing structure can not only ensure the sealing of the wire outlet part at the rear end of the connector to prevent external dust, liquid and harmful gas from invading the inside of the plug or socket, but also form a sealing barrier between the optical fiber contacts, so that each pair of mating optical fiber contacts can achieve a sealing effect, thereby improving the environmental resistance of the connector.

[0032] (9) By providing a keyway structure with clearance fit on the outer wall of the optical fiber docking structure and the inner wall of the mounting frame, it is ensured that the optical fiber docking structure can be installed in the mounting frame with floating self-alignment function in the X, Y and Z directions.

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a schematic diagram of the optical fiber docking structure in the present invention.

[0036] Figure 2 It is a schematic diagram of the structure of the plug.

[0037] Figure 3 is a cross-sectional view of the plug.

[0038] Figure 4 This is a disassembled diagram of the plug.

[0039] Figure 5 yes Figure 1 Right side view of the middle plug.

[0040] Figure 6 yes Figure 5 Sectional view along AA direction.

[0041] Figure 7 is a schematic diagram of the spline housing.

[0042] Figure 8 It is a structural schematic diagram of an optical fiber contact, a top stop positioning structure, an insulating cover plate and a wire sealing body.

[0043] Fig. 9 It is a schematic diagram of the socket structure.

[0044] Fig.10 is a cross-sectional view of the socket.

[0045] Fig.11 Schematic diagram of the housing.

[0046] Fig.12 This is a schematic diagram of the socket after removing the socket shell.

[0047] Markings in the diagram: 1. head shell; 2. seat shell; 201. limit groove; 202. positioning groove; 203. shell guide surface; 3. spline shell; 301. anti-misinsertion key; 302. limit key; 303. flange; 4. insulator; 5. optical fiber contact; 6. insulating cover; 7. sealing body; 701. drum-shaped step hole; 8. limit block; 9. fastening nut; 10. axial spring; 11. retaining ring; 111. spring; 12. limit sleeve; 13. interface sealing gasket; 1301. conical elastic protrusion; 14. boss; 15. optical fiber mounting hole. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be understood that the directions or positional relationships indicated by "upper" and "lower" in the art are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention. The "front end" in the text refers to the plug end, and the "rear end" refers to the end away from the plug end.

[0050] The present invention provides a fiber optic docking structure and a heavy-duty connector, wherein the heavy-duty connector includes a mounting frame (not shown in the figure) and a fiber optic docking structure. Since the fiber optic docking structure needs to be installed in the mounting frame of the heavy-duty connector, the installation size and maximum external size of the fiber optic docking structure are limited. The fiber optic docking structure of the present invention adopts a modular design and can be installed in a rectangular mounting cavity of the mounting frame, which is convenient for installation and subsequent maintenance at any time, and can meet the needs of rail transit and other heavy-duty application fields for high-speed signal interconnection. The specific structure of the fiber optic docking structure is described in detail below.

[0051] The optical fiber docking structure includes a plug and a socket, please refer to Figures 1 to 12, wherein the plug includes a head shell 1, a spline shell 3, an axial spring 10, a limit block 8, a fastening nut 9, an insulating component, a retaining spring 11, and an optical fiber contact 5. The head shell 1 is a square structure with a through-mounting hole. The rear part of the spline shell 3 is accommodated in the through-mounting hole of the head shell 1, and the front part passes through the head shell 1. The spline shell 3 is cylindrical as a whole, the insulating component is installed in the spline shell 3, and the optical fiber contact 5 is installed in the insulating component. The socket includes a seat shell 2, a fastening nut 9, an insulating component, a retaining spring 11, and an optical fiber contact 5. The front section of the seat shell 2 is a cylindrical structure, and the rear section is a square structure with a through-mounting hole. When the plug and the socket are plugged in, the cylindrical structure of the front section of the seat shell 2 and the front section of the spline shell 3 are plugged in through an adaptive circular interface. This is because the round shaft has the highest processing accuracy, so a special circular interface design is adopted at the butt end to ensure the plug-in effect. An insulating component is arranged in the seat shell 2, and an optical fiber contact 5 is arranged in the insulating component. The present invention designs the head shell 1 as a whole and the rear section of the seat shell 2 to be a square structure, which can be adapted to be installed in the rectangular installation cavity of the installation frame. The head shell 1 as a whole and the seat shell 2 are machined and surface-treated with high-strength metal to meet the strength and salt spray requirements of the connector.

[0052] It should be noted that the outer wall of the head housing 1 and / or the seat housing 2 is provided with a boss 14, and the inner wall of the mounting frame is provided with a groove that matches the boss 14, so as to ensure that the optical fiber docking structure can be installed in the mounting frame with floating self-alignment function in the X, Y and Z directions. In addition, the positioning accuracy of the optical fiber docking is relatively high, please refer to Fig.11 The fiber optic docking structure of the present invention is provided with a shell guide surface 203 at the plug-in port of the seat shell 2 to provide a redundant dimension, guide the matching head seat to be plugged in, improve the plug-in accuracy, and transition the shell guide surface 203 to the inner wall of the seat shell 2 through an arc, ensuring a smooth transition and smooth plug-in of the head seat. During the installation and plug-in process of the heavy-duty connector, the floating function can not only realize the self-alignment of the fiber optic docking structure but also eliminate the matching tolerance between the heavy-duty connector shells. Specifically, the shell guide surface 203 is an annular bevel, which is a continuous bevel extending in the circumferential direction, or is surrounded by a plurality of bevels spaced apart in the circumferential direction.

[0053] Please refer to Figure 7 and Fig.11In the present invention, an anti-mistake key 301 is provided on the front part of the spline housing 3, and a positioning groove 202 cooperating therewith is provided on the front section of the seat housing 2. Preferably, two anti-mistake keys 301 are provided on the outer peripheral surface of the front part of the spline housing 3 along the circumferential direction, and the two anti-mistake keys 301 are distributed at a certain angle, one of which (hereinafter referred to as the "primary key" for the convenience of description) plays a guiding role, and the position of the other anti-mistake key 301 (hereinafter referred to as the "secondary key" for the convenience of description) is changed at different angles based on the primary key as needed, so that the anti-mistake insertion of products at different positions in the same area can be realized. The precise positioning function and blind plugging function of the plug and the socket are realized by cooperating with the anti-mistake key 301 and the positioning groove 202. Preferably, the anti-mistake key 301 is in the shape of a bullet head with a narrow front end and a wide rear end, which can accurately guide during plugging.

[0054] The outer circumferential mating surface of the spline housing 3 and the seat housing 2 can form a reliable support after being inserted into place. A flange 303 is provided on the outer circumferential surface of the spline housing 3. The front end surface of the flange 303 cooperates with the head housing 1 to form a positioning surface. A limit key 302 is provided at the front end of the flange 303, and a limit groove 201 that cooperates with it is provided on the seat housing 2. This limit key 302 prevents the spline housing 3 from rotating in the head housing 1 after assembly, and plays a limiting role. The line connecting the limit key 302 and the main key, or the limit groove 201 and one of the positioning grooves 202 is parallel to the axis of the spline housing 3, and there is a gap between the two keys or the two grooves along the axial direction. Figure 7 It can be seen that there is a complete annular interval between the limit key 302 and the main key, and the complete circular outer surface is processed with higher precision (i.e., smaller tolerance). After insertion, the "anti-mistake key 301-positioning groove 202" feature can form an accurate two-point support in the axial direction, with accurate positioning to prevent the swing of the plug and socket from affecting the optical performance of the product, and high reliability in extremely high vibration and impact mechanical environments. The present invention designs "anti-mistake key 301-positioning groove 202" and a two-level guiding mechanism of the shell at the matching point of the plug and the socket to improve the matching accuracy in the circumferential direction, reduce the matching clearance of the module docking, prevent excessive axial deflection, achieve accurate guidance when the head seat is plugged in, and ensure the centering of the optical fiber.

[0055] In the present invention, the head housing 1 is provided with an axial spring 10, a stopper 8 and a fastening nut 9. The stopper 8 and the fastening nut 9 are arranged at the rear of the spline housing 3 and are limited by the inner wall of the through-mounting hole; the front end of the axial spring 10 is pressed against the flange 303, and the rear end is pressed against the stopper 8. The axial spring 10 can generate axial compression, and in the front section of the alignment and guiding process of the plug and the socket, the assembly and guiding tolerance of the housing is offset, and the optical fiber docking structure is provided with a self-protection function. When the spline housing 3 is displaced relative to the head housing 1, the force generated by the compression of the axial spring 10 is applied to the spline housing 3, so that the plug and the socket are kept in a close state, and the end face of the optical fiber contact 5 is ensured to be reliably docked. The fastening nut 9 is used to fix the axial spring 10. The inner wall of the head housing 1 is provided with a step (the step surface of the step is a rigid docking surface, and the axial spring 10 will not move with it due to the gap displacement to affect the docking), and is used in conjunction with the stopper 8 to prevent the axial spring 10 from being compressed too much in the axial direction, so that the spring function fails.

[0056] Regarding the insulating component, the insulating component and the housing (seat housing 2 or spline housing 3) are fixed by glue injection. The spline housing 3 and the seat housing 2 are provided with glue injection grooves for containing glue. During assembly, the insulating component is fixed in the housing by special tooling. A plurality of optical fiber mounting holes 15 are provided in the insulating component, and the optical fiber contact 5 is installed in the corresponding optical fiber mounting holes 15. The insulating component includes, from front to back, an insulator 4 and an insulating cover plate 6 connected by locating pins. Furthermore, the insulator 4 and the insulating cover plate 6 can be fixed together by epoxy adhesive bonding, and the epoxy adhesive bonding can form the insulator 4 and the insulating cover plate 6 into a homogeneous solid.

[0057] The optical fiber contact 5 is positioned in the optical fiber mounting hole 15 of the insulating component by the top stop positioning structure. For details, please refer to Figure 6 and Figure 8The top stop positioning structure includes a spring 11 installed in the optical fiber installation hole 15 and a limit sleeve 12 fixedly installed on the outer wall of the optical fiber contact 5. The spring 11 is fixed in a groove formed by the inner walls of the insulator 4 and the insulating cover 6. One end of the spring 11 rests on the boss of the insulating cover 6, and the other end rests on the inner wall of the insulator 4 toward the rear end, thereby improving the supporting strength of the spring 11. The limiting sleeve 12 is an annular structure with a boss as a whole. The retaining spring 11 cooperates with the limiting sleeve 12 to position the optical fiber contact 5. The optical fiber contact 5 is fixed in the insulating component by the retaining spring 11. A spring piece 111 is arranged on the retaining spring 11. When the optical fiber contact 5 is sent to the correct position of the insulating component by using an embedding tool, the spring piece 111 on the retaining spring 11 clamps the limiting sleeve 12 to fix the optical fiber contact 5 in the correct position. When the optical fiber contact 5 needs to be removed, the insulating component and the optical fiber contact 5 are first removed from the housing as a whole, and then the removal tool is extended to the retaining spring 11 from the insulating cover 6 side. When the removal tool is used to expand the spring piece 111 on the retaining spring 11, the optical fiber contact 5 can be easily pulled out from the insulating cover 6 side, so that the maintainability of the connector is greatly improved, and the optical cable has single-point maintainability. It should be noted that the specific structures of the optical fiber contact 5 in the plug and the socket are not the same. The optical fiber contact 5 of the socket contains a pin, and the optical fiber contact 5 of the plug contains a socket. This belongs to the prior art and will not be described in detail in the present invention.

[0058] It should be noted that the optical fiber contact 5 can also be a beam expansion optical fiber contact, and the optical fiber contact 5 has a built-in lens to achieve the effect of beam expansion and focusing, and realize non-contact transmission of optical signals. The optical signal can be expanded by dozens to hundreds of times after beam expansion, and the influence of fine pollutants on signal transmission is greatly reduced, ensuring that the signal transmission is still highly reliable in harsh environments.

[0059] As a preferred embodiment of the present invention, the optical fiber docking structure also includes a sealing structure. In order to ensure the sealing of the wire outlet part of the connector tail and prevent external dust, liquid and harmful gas from invading the inside of the plug or socket, a first-level sealing structure is designed at the tail of the plug or socket, and the first-level sealing structure is a sealing body 7 arranged behind the insulating component. A plurality of drum-shaped step holes 701 are designed inside the sealing body 7, and these drum-shaped step holes 701 can firmly clamp the optical fiber contact 5 passing through. At the same time, the sealing between the insulating component and the outside world can be achieved by potting silicone rubber between the tail sealing body 701 and the head seat shell. For the hole position where the optical fiber contact 5 is not installed, in order to achieve the sealing effect, a special sealing plug is also designed to be inserted into the drum-shaped step hole 701 of the sealing body 7. In order to improve the sealing effect between the optical fiber contacts 5, an interface sealing pad 13 is designed on the plugging surface of the optical fiber contact 5 in the socket, and a conical elastic protrusion 1301 is designed around a single pin. After the head seat is plugged in, the conical elastic protrusion 1301 on one side of the pin is pressed together with the end face of the insulator 4 in the plug, forming a sealing barrier between the optical fiber contacts 5, so that each pair of mating optical fiber contacts 5 can achieve a sealing effect, thereby improving the environmental resistance of the connector.

[0060] The above is a detailed introduction to an optical fiber docking structure and a heavy-duty connector provided by the present invention. This article uses specific examples to illustrate the principles and specific implementation methods of the present invention. The above embodiments are only used to help understand the methods and core ideas of the present invention. It should be pointed out that for ordinary technicians in this field, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. An optical fiber docking structure, characterized in that: include: A plug comprises a head shell (1) and a spline shell (3), wherein the head shell (1) comprises a through mounting hole, the spline shell (3) is cylindrical in shape as a whole, with the plug-in end as the front end, the rear portion of the spline shell (3) is accommodated in the through mounting hole of the head shell (1), and the front portion extends out of the head shell (1); an insulating component is provided in the spline shell (3), and an optical fiber contact (5) is installed in the insulating component; The socket comprises a socket housing (2), the front section of the socket housing (2) being cylindrical and the rear section being a structure containing a through mounting hole, the front section of the socket housing (2) and the front section of the spline housing (3) being plugged into each other via a matching circular interface; an insulating component is provided inside the socket housing (2), and an optical fiber contact (5) is installed inside the insulating component; The optical fiber docking structure can be movably installed on the device to be installed, and the plug-in port of the seat shell (2) or the spline shell (3) is provided with a shell guide surface (203) to guide the matching plug and socket to be plugged in, thereby achieving accurate docking of the optical fiber.

2. The optical fiber docking structure according to claim 1, characterized in that: The shell guide surface (203) is an annular inclined surface; the annular inclined surface is a continuous inclined surface extending in the circumferential direction, or is formed by a plurality of inclined surfaces distributed at intervals in the circumferential direction.

3. The optical fiber docking structure according to claim 1, characterized in that: At least one anti-misinsertion key (301) or positioning groove (202) is provided at a position on the front portion of the spline housing (3) for docking with the seat housing (2) to prevent the spline housing (3) and the seat housing (2) from being misinserted.

4. The optical fiber docking structure according to claim 3, characterized in that: The error-proof insertion key (301) is in the shape of a bullet head with a narrow front end and a wide rear end.

5. The optical fiber docking structure according to claim 3, characterized in that: A flange (303) is provided on the outer peripheral surface of the spline housing (3), and the flange (303) cooperates with the head housing (1) to limit the position of the spline housing (3).

6. The optical fiber docking structure according to claim 5, characterized in that: A limit key (302) or a limit groove (201) is provided at the front end of the flange (303) to prevent the spline housing (3) from rotating in the head housing (1).

7. The optical fiber docking structure according to claim 6, characterized in that: An annular spacer is present along the axial direction between the limit key (302) and the anti-error insertion key (301), or between the limit groove (201) and the positioning groove (202).

8. The optical fiber docking structure according to claim 5, characterized in that: An axial spring (10), a limit block (8) and a fastening nut (9) are arranged in the head housing (1); the limit block (8) and the fastening nut (9) are arranged at the rear of the spline housing (3) and are limited by the inner wall of the through-mounting hole; the front end of the axial spring (10) is pressed against the flange (303), and the rear end is pressed against the limit block (8).

9. The optical fiber docking structure according to claim 1, characterized in that: A plurality of optical fiber installation holes (15) are provided in the insulating component, and the optical fiber contact piece (5) is installed in the corresponding optical fiber installation hole (15) through a stop positioning structure.

10. The optical fiber docking structure according to claim 9, characterized in that: The top stop positioning structure comprises a retaining spring (11) fixed in the optical fiber installation hole (15) and a limiting sleeve (12) fixedly installed on the outer wall of the optical fiber contact piece (5); the retaining spring (11) and the limiting sleeve (12) cooperate to position the optical fiber contact piece (5).

11. The optical fiber docking structure according to claim 1, characterized in that: The insulating component comprises, from front to back, an insulator (4) and an insulating cover plate (6) connected via positioning pins.

12. The optical fiber docking structure according to claim 11, characterized in that: The optical fiber docking structure also includes a sealing structure, which includes a first-level sealing structure provided at the rear of the spline housing (3) and / or the seat housing (2) for sealing the optical fiber contact (5), and a second-level sealing structure provided at the front end of the socket for plugging with the plug-in end of the plug to seal the interface between the two in the plugged state.

13. The optical fiber docking structure according to claim 12, characterized in that: The first-level sealing structure comprises a wire sealing body (7) arranged behind the insulating component, the wire sealing body (7) being glued and fixed to the insulating component, and a drum-shaped step hole (701) capable of firmly clamping the optical fiber contact piece (5) is provided inside the wire sealing body (7).

14. The optical fiber docking structure according to claim 12, characterized in that: The second-level sealing structure is an interface sealing pad (13) arranged in front of the insulating component in the socket, and a conical elastic protrusion (1301) is provided on the front end surface of the interface sealing pad (13) at a position corresponding to the installation of the optical fiber contact piece (5).

15. The optical fiber docking structure according to claim 2, characterized in that: The head shell (1) and the seat shell (2) are both made of metal.

16. A heavy-duty connector, characterized in that: The invention comprises an installation frame and an optical fiber docking structure as claimed in any one of claims 1 to 15 installed in the installation frame.

17. A heavy-duty connector according to claim 16, characterized in that: A boss (14) is provided on the outer wall of the head housing (1) and / or the seat housing (2), and a groove that is clearance-matched with the boss (14) is provided on the inner wall of the mounting frame, so as to ensure that the optical fiber docking structure can float along the mounting frame.

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