Optical fiber butt joint structure and heavy load connector

Abstract

The utility model 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, the plugging end is taken as the front end, the rear part of the spline housing is accommodated in the through mounting hole of the head housing, and the plug is inserted into the through mounting hole. 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. According to the utility model, 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 the rectangular installation cavity of the original installation frame, and the installation of the optical fiber butt joint structure is realized; and meanwhile, the heavy-load connector can resist high vibration and impact by adjusting an optical fiber butt joint structure.

Description

Technical Field

[0001] This utility model relates to the field of heavy-duty connector technology, and in particular to an optical fiber mating structure and a heavy-duty connector. Background Technology

[0002] Heavy-duty connectors, due to their modular design, are widely used in harsh industrial environments such as rail transportation, heavy-duty machinery, hot runner systems, and power automation, primarily for the transmission of power, data, and signals. In terms of data and signal transmission, most heavy-duty connectors currently used are RJ45 data connectors and signal connectors for connecting signal cables. Their disadvantages include susceptibility to electromagnetic interference, leading to unstable signal transmission or even signal distortion. Furthermore, their signal transmission capacity is limited; when transmitting large amounts of information or over long distances, signal delays or distortions may occur.

[0003] Fiber optic transmission boasts strong anti-interference capabilities and large capacity, making it suitable for addressing the aforementioned issues. Therefore, heavy-duty connectors utilizing fiber optic transmission are widely used. However, current heavy-duty connectors present the following problems that require resolution:

[0004] (1) Fiber optic heavy-duty connectors generally include a mounting frame and an optical fiber mating structure adapted to be mounted thereon, such as the appendix to the utility model patent with publication number CN218919299U. Figure 1 Appendix to the utility model patent with publication number CN202352910U Figure 1 As can be seen, the cross-section of the mounting cavity in the mounting frame used to install the fiber optic docking structure is rectangular. This requires that the cross-section of the housing of the mating fiber optic docking structure also be rectangular. At the same time, the housings of current fiber optic docking structures are mostly die-cast cuboid structures, with a large tolerance range between housings, which cannot meet the high-precision insertion requirements. However, if the housing structure of the fiber optic docking structure is changed to a circle to reduce the tolerance, there is a problem that the circular structure cannot be adapted to the rectangular mounting cavity in the original mounting frame.

[0005] (2) Due to the processing error and installation fit error of heavy-duty connectors, forced installation will damage the fiber optic docking structure. Therefore, the fiber optic docking structure needs to have floating self-alignment function in the X, Y and Z directions in the installation frame. At the same time, since the fiber optic docking structure has high positioning accuracy requirements, the plug and socket in the fiber optic docking structure need to have redundant dimensions when plugged in.

[0006] (3) Since heavy-duty connectors are mostly used outdoors and in harsh environments such as high vibration and shock, extremely high requirements are also placed on the mechanical life, vibration and shock resistance and dirt resistance of the fiber optic docking structure.

[0007] Therefore, there is an urgent need for a heavy-duty connector that can fit the existing mounting frame with a rectangular mounting cavity, is resistant to high vibration, impact and dirt, has high guiding accuracy, and is suitable for harsh outdoor environments. Utility Model Content

[0008] In view of this, the purpose of this utility model is to provide a fiber optic docking structure and a heavy-duty connector. By changing the housing structure of the plug and socket in the fiber optic docking structure, the original electrical interface is compatible with the installation of the fiber optic docking structure without changing the connector at the device end. At the same time, by adjusting the fiber optic docking structure, the heavy-duty connector can withstand high vibration and impact.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0010] On one hand, this utility model discloses an optical fiber docking structure, including:

[0011] The plug includes a head shell and a spline shell. The head shell includes a through mounting hole. The spline shell is cylindrical in shape, 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 protrudes out of the head shell. An insulating component is provided inside the spline shell, and an optical fiber contact is installed inside the insulating component.

[0012] The socket includes a housing, the front section of which is cylindrical and the rear section has a through mounting hole. The front section of the housing and the front part of the spline housing are connected by a matching circular interface. An insulating component is provided inside the housing, and an optical fiber contact is installed inside the insulating component.

[0013] The fiber optic docking structure can be movably installed on the device to be installed. The insertion port of the housing or spline housing is provided with a housing guide surface to guide the matching plug and socket to be inserted, thereby achieving accurate fiber optic docking.

[0014] Furthermore, the shell guiding surface is a circumferential inclined surface; the circumferential inclined surface is a continuous inclined surface extending in the circumferential direction, or is formed by multiple inclined surfaces spaced apart in the circumferential direction.

[0015] Furthermore, at least one anti-misfit key or positioning groove is provided on the front part of the spline housing at the position for mating with the base housing to prevent misfitting of the spline housing and the base housing.

[0016] Furthermore, the anti-misalignment key is bullet-shaped with a narrow front end and a wide rear end.

[0017] Furthermore, a flange is provided on the outer peripheral surface of the spline housing, and the flange, in conjunction with the head housing, can limit the movement of the spline housing.

[0018] Furthermore, the front end of the flange is provided with a limit key or limit groove to prevent the spline housing from rotating inside the head housing.

[0019] Furthermore, there is an axially spaced section between the limit key and the anti-misinsertion key, or between the limit groove and the positioning groove.

[0020] Furthermore, the head housing is provided with an axial spring, a limiting block and a fastening nut. The limiting block and the fastening nut are located behind the spline housing and are limited by the inner wall of the through mounting hole. The front end of the axial spring rests on the flange and the rear end rests on the limiting block.

[0021] Furthermore, the insulating component is provided with several optical fiber mounting holes, and the optical fiber contact is installed in the corresponding optical fiber mounting hole through a top-stop positioning structure.

[0022] Furthermore, the top-stop positioning structure includes a retaining ring fixed in the optical fiber mounting hole and a limiting sleeve fixedly installed on the outer wall of the optical fiber contact. The retaining ring and the limiting sleeve cooperate to position the optical fiber contact.

[0023] Furthermore, the insulating component comprises, from front to back, an insulator and an insulating cover plate connected by a locating pin.

[0024] Furthermore, the optical fiber docking structure also includes a sealing structure, which includes a first-stage sealing structure located at the tail of the spline housing and / or the base housing for sealing the optical fiber contact, and a second-stage sealing structure located at the front end of the socket for fitting with the plug end to seal the interface between the two in the plugged state.

[0025] Furthermore, the first-stage sealing structure includes a sealing line body located behind the insulating component. The sealing line body is glued to the insulating component, and the sealing line body has a drum-shaped stepped hole inside that can firmly clamp the optical fiber contact.

[0026] Furthermore, the second-level sealing structure is an interface sealing gasket located in front of the insulating component in the socket, and the front end face of the interface sealing gasket has a tapered elastic protrusion corresponding to the position where the optical fiber contact is installed.

[0027] Furthermore, both the head shell and the base shell are made of metal.

[0028] On the other hand, this utility model discloses a heavy-duty connector, including a mounting frame and an optical fiber docking structure installed within the mounting frame.

[0029] Furthermore, the outer wall of the head housing and / or the seat housing is provided with a boss, and the inner wall of the mounting frame is provided with a groove that fits the boss with a gap, so as to ensure that the fiber optic docking structure can float along the mounting frame.

[0030] Beneficial effects:

[0031] (1) The present invention designs the head shell and the rear section of the seat shell as a cuboid structure, which can be installed in the rectangular mounting cavity of the original mounting frame without adjusting the structure of the mounting frame.

[0032] (2) The present invention provides a housing guide surface at the insertion port of the housing or spline housing, which provides redundant dimensions. Under the premise that the fiber optic docking structure is movably installed on the equipment to be installed, it can guide the matching head to be inserted, thereby improving the accuracy of insertion.

[0033] (3) A flange is provided on the outer circumferential surface of the spline housing of this utility model. The flange and the head shell are fitted together to form a positioning surface. A limit key is provided at the front end of the flange. This key prevents the spline housing from rotating inside the head shell after assembly and plays an anti-rotation role.

[0034] (4) The present invention has an anti-misfit insertion key on the front part of the spline housing and a positioning groove that cooperates with it on the front part of the socket housing. The anti-misfit insertion key and the positioning groove cooperate with each other to achieve the precise positioning function of the plug and socket and the blind insertion function.

[0035] (5) There is a complete annular interval between the limit key and one of the anti-misalignment keys of this utility model. This annular interval benefits from the advantages of the round shaft and requires extremely high processing precision. After insertion, it can form a precise two-point support with the "anti-misalignment key-positioning groove" feature, which is accurate in positioning and prevents the plug and socket from swinging and affecting the product's optical performance. It has high reliability in extremely high vibration and impact mechanical environments.

[0036] (6) This utility model uses a combination of fastening nut and limiting block to limit the axial spring, which makes the fixing surface a rigid mating surface and will not cause the axial spring to move and affect the mating due to gap displacement.

[0037] (7) The fiber optic contact of this utility model is positioned in the fiber optic mounting hole of the insulating component by the top stop positioning structure. When the removal tool is used to act on the top stop positioning structure, the fiber optic contact can be easily removed from the insulating component, which greatly improves the maintainability of the connector and has single-point maintainability of the optical cable.

[0038] (8) The fiber optic docking structure of this utility model also includes a sealing structure. The sealing structure can not only ensure the sealing of the wire outlet of the connector tail to prevent external dust, liquid and harmful gas from entering the plug or socket, but also form a sealing barrier between the fiber optic contacts, so that each pair of mating fiber optic contacts can achieve a sealing effect, thereby improving the environmental resistance of the connector.

[0039] (9) By setting a keyway structure with clearance fit on the outer wall of the fiber optic docking structure and the inner wall of the mounting frame, the fiber optic docking structure can be installed in the mounting frame and have the function of floating and self-aligning in the X, Y and Z directions.

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the optical fiber docking structure in this utility model.

[0043] Figure 2 This is a schematic diagram of the plug.

[0044] Figure 3 This is a cross-sectional view of the plug.

[0045] Figure 4 This is a breakdown diagram of the plug.

[0046] Figure 5 yes Figure 1 Right view of the plug.

[0047] Figure 6 yes Figure 5 Sectional view along the AA direction.

[0048] Figure 7 This is a schematic diagram of the splined housing.

[0049] Figure 8 This is a structural diagram of the fiber optic contact, top stop positioning structure, insulating cover plate, and sealing body.

[0050] Figure 9 This is a structural diagram of a socket.

[0051] Figure 10 This is a cross-sectional view of the socket.

[0052] Figure 11 This is a schematic diagram of the outer shell.

[0053] Figure 12 This is a diagram showing the socket after the outer casing has been removed.

[0054] The diagram shows the following markings: 1. Head housing; 2. Seat housing; 201. Limiting groove; 202. Positioning groove; 203. Housing guide surface; 3. Spline housing; 301. Anti-misinsertion key; 302. Limiting key; 303. Flange; 4. Insulator; 5. Fiber optic contact; 6. Insulating cover; 7. Sealing body; 701. Drum-shaped stepped hole; 8. Limiting block; 9. Fastening nut; 10. Axial spring; 11. Snap ring; 111. Spring; 12. Limiting sleeve; 13. Interface sealing gasket; 1301. Conical elastic protrusion; 14. Boss; 15. Fiber optic mounting hole. Detailed Implementation

[0055] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0056] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper" and "lower" in the description is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. In the text, "front end" refers to the plug-in end, and "rear end" refers to the end away from the plug-in end.

[0057] This invention provides a fiber optic docking structure and a heavy-duty connector. 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 within the mounting frame of the heavy-duty connector, its installation size and maximum external dimensions are limited. This invention's fiber optic docking structure adopts a modular design, allowing it to be installed within the rectangular mounting cavity of the mounting frame. This facilitates easy installation and subsequent maintenance, meeting the high-speed signal interconnection requirements of rail transit and other heavy-duty applications. The specific structure of the fiber optic docking structure is described in detail below.

[0058] The fiber optic docking structure includes a plug and a socket; please refer to [reference needed]. Figures 1 to 12The plug includes a head shell 1, a splined shell 3, an axial spring 10, a limiting block 8, a fastening nut 9, an insulating component, a retaining ring 11, and an optical fiber contact 5. The head shell 1 is a cuboid structure with a through-hole. The rear part of the splined shell 3 is housed within the through-hole, while the front part protrudes from the head shell 1. The splined shell 3 is cylindrical, with the insulating component installed inside and the optical fiber contact 5 installed within it. The socket includes a base shell 2, a fastening nut 9, an insulating component, a retaining ring 11, and an optical fiber contact 5. The front section of the base shell 2 is cylindrical, while the rear section is a cuboid structure with a through-hole. When the plug and socket are inserted, they are connected via a matching circular interface between the cylindrical structure of the base shell 2 and the front part of the splined shell 3. This is because circular shafts have the highest machining precision, hence the special circular interface design at the mating end ensures a good fit. The base shell 2 contains an insulating component, and the optical fiber contact 5 is located within the insulating component. This utility model designs the head shell 1 and the rear section of the seat shell 2 as a cuboid structure, which can be adapted to be installed in the rectangular mounting cavity of the mounting frame. The head shell 1 and the seat shell 2 are made of high-strength metal and have been surface treated to meet the strength and salt spray requirements of the connector.

[0059] It should be noted that the outer walls of the head housing 1 and / or the seat housing 2 are provided with bosses 14, and the inner walls of the mounting frame are provided with grooves that fit with the bosses 14, to ensure that the fiber optic docking structure can float and self-align in the X, Y, and Z directions after being installed in the mounting frame. Furthermore, fiber optic docking requires high positioning accuracy; please refer to [reference needed]. Figure 11 The fiber optic docking structure of this invention features a housing guide surface 203 at the insertion port of the housing 2 to provide redundant dimensions, guiding the mating head for mating and improving the accuracy of mating. The housing guide surface 203 and the inner wall of the housing 2 are connected by an arc, ensuring a smooth transition and seamless mating of the head. During the installation and mating of heavy-duty connectors, the floating function not only enables the self-alignment of the fiber optic docking structure but also eliminates tolerances in the fit between heavy-duty connector housings. Specifically, the housing guide surface 203 is a circumferential inclined surface, which can be a continuous inclined surface extending circumferentially, or formed by multiple inclined surfaces spaced apart circumferentially.

[0060] Please refer to Figure 7 and Figure 11This invention features an anti-misinsertion key 301 on the front part of the spline housing 3, and a positioning groove 202 that mates with it on the front section of the base housing 2. Preferably, two anti-misinsertion keys 301 are circumferentially arranged on the outer peripheral surface of the front part of the spline housing 3, with the two keys 301 distributed at a certain angle. One anti-misinsertion key 301 (hereinafter referred to as the "main key") serves as a guide, while the position of the other anti-misinsertion key 301 (hereinafter referred to as the "secondary key") can be adjusted at different angles based on the main key as needed, thus achieving anti-misinsertion of products in different positions within the same area. The precise positioning function of the plug and socket, as well as the blind insertion function, are achieved through the cooperation of the anti-misinsertion key 301 and the positioning groove 202. Preferably, the anti-misinsertion key 301 has a bullet-shaped design with a narrow front end and a wide rear end, which can accurately guide the insertion process.

[0061] After the outer circumferential mating surface of the spline housing 3 is inserted into the seat housing 2, a reliable support can be formed. A flange 303 is provided on the outer circumferential surface of the spline housing 3. The front end face of the flange 303 mates with the head housing 1 to form a positioning surface. A limiting key 302 is provided at the front end of the flange 303, and a limiting groove 201 mates with it is provided on the seat housing 2. This limiting key 302 prevents the spline housing 3 from rotating within the head housing 1 after assembly, thus serving a limiting function. The line connecting the limiting key 302 and the main key, or the limiting groove 201 and one of the positioning grooves 202, is parallel to the axis of the spline housing 3, and there is an axial gap between the two keys or the two grooves. Figure 7 It can be seen that there is a complete annular gap between the limit key 302 and the main key. The complete circular outer surface has higher machining precision (i.e., smaller tolerance). After mating, it can form a precise two-point support in the axial direction with the "anti-misalignment key 301-positioning groove 202" feature, ensuring accurate positioning and preventing the plug and socket from swinging and affecting the product's optical performance. It also has high reliability in extremely high vibration and shock mechanical environments. This utility model designs the "anti-misalignment key 301-positioning groove 202" and a two-stage guiding mechanism in the housing at the mating point of the plug and socket, improving the mating precision in the circumferential direction, reducing the mating gap of the module docking, preventing excessive axial misalignment, achieving precise guidance when the head and socket are mated, and ensuring fiber alignment.

[0062] In this invention, the head housing 1 is equipped with an axial spring 10, a limiting block 8, and a fastening nut 9. The limiting block 8 and the fastening nut 9 are located behind the spline housing 3 and are limited by the inner wall of the through mounting hole. The front end of the axial spring 10 rests on the flange 303, and the rear end rests on the limiting block 8. The axial spring 10 can generate axial compression, which, during the alignment and guidance process before the plug and socket are inserted, offsets the assembly and guidance tolerances of the housing, providing a self-protection function for the fiber optic connection structure. 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, keeping the plug and socket in a tight fit and ensuring reliable end-face connection of the fiber optic contact 5. 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 is a rigid mating surface, so that the axial spring 10 will not move due to gap displacement and affect the connection), which works in conjunction with the limiting block 8 to prevent excessive axial compression of the axial spring 10, which would cause the spring to malfunction.

[0063] Regarding the insulating components, the insulating components are fixed to the housing (base housing 2 or spline housing 3) by potting adhesive. Potting tanks for containing adhesive are provided inside the spline housing 3 and base housing 2. During assembly, the insulating components are fixed inside the housing using specialized tooling. The insulating components have several fiber optic mounting holes 15, and fiber optic contacts 5 are installed in the corresponding fiber optic mounting holes 15. The insulating components, from front to back, include an insulator 4 and an insulating cover plate 6 connected by positioning pins. Furthermore, the insulator 4 and the insulating cover plate 6 can be fixed together by epoxy adhesive bonding, which allows the insulator 4 and the insulating cover plate 6 to form a homogeneous solid.

[0064] The fiber optic contact 5 is positioned in the fiber optic mounting hole 15 of the insulating component by a top-stop positioning structure. For details, please refer to [reference needed]. Figure 6 and Figure 8The top-stop positioning structure includes a retaining ring 11 installed in the optical fiber mounting hole 15 and a limiting sleeve 12 fixedly installed on the outer wall of the optical fiber contact 5. The retaining ring 11 is fixed in the groove formed by the inner wall of the insulator 4 and the insulating cover plate 6. One end of the retaining ring 11 abuts against the protrusion of the insulating cover plate 6, and the other end abuts against the inner wall of the insulator 4 facing the rear end, which improves the support strength of the retaining ring 11. The limiting sleeve 12 has an overall ring-shaped structure with a boss. 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 provided on the retaining spring 11. When the optical fiber contact 5 is inserted into the correct position of the insulating component using an insertion tool, the spring piece 111 on the retaining spring 11 will lock the limiting sleeve 12 to fix the optical fiber contact 5 in the correct position. When it is necessary to remove the optical fiber contact 5, first remove the insulating component and the optical fiber contact 5 as a whole from the housing. Then, extend the removal tool to the retaining spring 11 from the insulating cover plate 6 side. After the spring piece 111 on the retaining spring 11 is expanded by the removal tool, the optical fiber contact 5 can be easily pulled out from the insulating cover plate 6 side, which greatly improves the maintainability of the connector and provides single-point maintainability of the optical cable. 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 in the socket contains a pin, while the optical fiber contact 5 in the plug contains a socket. This is prior art and will not be described in detail here.

[0065] It should be noted that the fiber optic contact 5 can also be a beam-expanding fiber optic contact. The fiber optic contact 5 has a built-in lens to achieve the effect of beam expansion and focusing, realizing non-contact transmission of optical signals. The optical signal can be expanded by tens to hundreds of times after beam expansion, and the influence of small contaminants on signal transmission is greatly reduced, ensuring high reliability of signal transmission even in harsh environments.

[0066] As a preferred embodiment of this utility model, the optical fiber mating structure also includes a sealing structure. To ensure the sealing of the lead wire exit portion at the connector tail and prevent external dust, liquids, and harmful gases from entering the plug or socket, a first-level sealing structure is designed at the tail of the plug or socket. This first-level sealing structure is a sealing body 7 located behind the insulating component. Multiple drum-shaped stepped holes 701 are designed inside the sealing body 7, which can firmly hold the passing optical fiber contact 5. Simultaneously, by filling the space between the tail sealing body 701 and the head housing with silicone rubber, a seal between the insulating component and the outside environment can be achieved. For holes where no optical fiber contact 5 is inserted, a dedicated sealing plug is designed to be inserted into the drum-shaped stepped holes 701 of the sealing body 7 to achieve a sealing effect. To improve the sealing effect between the optical fiber contacts 5, an interface sealing gasket 13 is designed on the mating surface of the optical fiber contact 5 in the socket, and tapered elastic protrusions 1301 are designed around each individual pin. After the connector is inserted, the tapered 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 fiber optic contacts 5, so that each pair of inserted fiber optic contacts 5 can achieve a sealing effect, thereby improving the environmental resistance of the connector.

[0067] The fiber optic docking structure and heavy-duty connector provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and specific implementation of this utility model. The above embodiments are only used to help understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model fall within the protection scope of this utility model.

Claims

1. A fiber optic docking structure, characterized in that, include: The plug includes a head shell (1) and a spline shell (3). The head shell (1) includes a through mounting hole. The spline shell (3) is cylindrical in shape, with the plug end as the front end. The rear part of the spline shell (3) is housed in the through mounting hole of the head shell (1), and the front part protrudes out of the head shell (1). An insulating component is provided inside the spline shell (3), and an optical fiber contact (5) is installed inside the insulating component. The socket includes a socket housing (2), the front section of which is cylindrical and the rear section is a structure containing a through mounting hole. The front section of the socket housing (2) and the front part of the spline housing (3) are connected by 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 fiber optic docking structure can be movably installed on the device to be installed. The insertion port of the housing (2) or spline housing (3) is provided with a housing guide surface (203) to guide the matching plug and socket to be inserted and thus realize the accurate docking of the fiber optics.

2. The optical fiber docking structure according to claim 1, characterized in that, The shell guide surface (203) is a circumferential inclined surface; the circumferential inclined surface is a continuous inclined surface extending in the circumferential direction, or is formed by multiple inclined surfaces spaced apart in the circumferential direction.

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

4. The optical fiber docking structure according to claim 3, characterized in that, The anti-misalignment key (301) is bullet-shaped 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). The flange (303) cooperates with the head housing (1) to limit the spline housing (3).

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

7. The optical fiber docking structure according to claim 6, characterized in that, There is an axially spaced section between the limiting key (302) and the anti-misalignment key (301), or between the limiting groove (201) and the positioning groove (202).

8. The optical fiber docking structure according to claim 5, characterized in that, The head housing (1) is provided with an axial spring (10), a limiting block (8) and a fastening nut (9). The limiting block (8) and the fastening nut (9) are located behind the spline housing (3) and are limited by the inner wall of the through mounting hole. The front end of the axial spring (10) rests on the flange (303) and the rear end rests on the limiting block (8).

9. The optical fiber docking structure according to claim 1, characterized in that, The insulating component has several optical fiber mounting holes (15), and the optical fiber contact (5) is installed in the corresponding optical fiber mounting hole (15) through the top stop positioning structure.

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

11. The optical fiber docking structure according to claim 1, characterized in that, The insulating components, from front to back, include an insulator (4) and an insulating cover plate (6) connected by a positioning pin.

12. The optical fiber docking structure according to claim 11, characterized in that, The fiber optic docking structure also includes a sealing structure, which includes a first-level sealing structure located at the tail of the spline housing (3) and / or the seat housing (2) for sealing the fiber optic contact (5), and a second-level sealing structure located at the front end of the socket for fitting with the plug end 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-stage sealing structure includes a sealing body (7) located behind the insulating component. The sealing body (7) is glued to the insulating component. The sealing body (7) has a drum-shaped stepped hole (701) inside that can firmly hold the optical fiber contact (5).

14. The optical fiber docking structure according to claim 12, characterized in that, The second-level sealing structure is an interface sealing gasket (13) located in front of the insulating component in the socket. The front end surface of the interface sealing gasket (13) has a tapered elastic protrusion (1301) at the position where the optical fiber contact (5) is installed.

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

16. A heavy-duty connector, characterized in that, Includes an installation frame and an optical fiber docking structure as described in any one of claims 1-15, installed within the installation frame.

17. A heavy-duty connector according to claim 16, characterized in that, The outer walls of the head shell (1) and / or the seat shell (2) are provided with bosses (14), and the inner walls of the mounting frame are provided with grooves that fit the bosses (14) to ensure that the fiber optic docking structure can float along the mounting frame.

Images