Optical fiber assembly and heavy load connector

Abstract

The utility model provides an optical fiber assembly and a heavy load connector, the optical fiber assembly comprises a plug and a socket, the plug comprises a head outer shell and a head inner shell, an optical fiber contact element is installed in the head inner shell, the plug end is used as the front end, and the head outer shell is in a cube structure as a whole. The head inner shell comprises a small cube section located at the front section and a large cube section coaxially arranged behind the small cube section, the large cube section is contained in the head outer shell, and the small cube section penetrates out of the head outer shell; the socket comprises a socket outer shell, the whole socket outer shell is of a step cube structure, an optical fiber contact piece is installed in the socket outer shell, the front section of the socket outer shell is provided with a square hole in insertion fit with the small cube section, and the socket outer shell and the head inner shell achieve opposite insertion through an adaptive square interface. The whole optical fiber assembly adopts a square structure, adopts a square interface, and is small in size.

Description

Technical Field

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

[0002] Heavy-duty connectors, also known as HDC heavy-duty connectors, can directly connect electrical equipment modules on both sides, facilitating modular manufacturing of electrical equipment and effectively preventing wiring errors. During on-site installation, only the connection work of the heavy-duty connector needs to be performed. They are simple to install, efficient, easy to maintain, and can adapt to normal operation in complex and harsh environments. They are widely used in equipment requiring electrical and signal connections, such as construction machinery, textile machinery, packaging and printing machinery, tobacco machinery, robots, rail transportation, hot runners, power, and automation.

[0003] Currently, heavy-duty connectors are mostly used in outdoor and harsh environments with high vibration and shock. They have extremely high requirements for the mechanical life, vibration and shock resistance, and dirt resistance of fiber optic components. If the connector itself does not have a certain level of vibration and shock resistance and dirt resistance, the connector body is easily damaged, ultimately causing certain losses.

[0004] Furthermore, existing heavy-duty connectors require an increasing number of wire cores to connect the devices on both sides. This increase in the number of wire cores makes heavy-duty connectors larger and requires more space, which leads to excessively large heavy-duty connector sizes and hinders product miniaturization.

[0005] Meanwhile, heavy-duty connectors generally include a fixed frame and an optical fiber assembly fitted onto it, such as the appendix to 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 used to install the optical fiber assembly in the fixed frame is rectangular. How to ensure that the improved optical fiber assembly can still fit the rectangular mounting cavity of the original fixed frame is also a problem that technicians need to consider.

[0006] The purpose of this invention is to solve the above problems and propose a heavy-duty connector that is compact, resistant to high vibration, impact and dirt, and suitable for harsh outdoor environments. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide an optical fiber assembly and a heavy-duty connector. The optical fiber assembly adopts a cuboid structure and a square interface, and is compact in size.

[0008] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0009] On the one hand, this utility model provides an optical fiber assembly, including:

[0010] The plug includes a head shell and a head inner shell. The head inner shell is equipped with an optical fiber contact. The plug end is the front end. The head shell is generally cuboid in shape. The head inner shell includes a small cuboid segment located at the front end, which protrudes out of the head shell.

[0011] The socket includes a base shell, which is generally cuboid in shape. An optical fiber contact is installed inside the base shell. The front section of the base shell has a square hole that mates with a small cuboid section. The base shell and the head inner shell are connected by a matching square interface.

[0012] Furthermore, the front part of the small cube segment is provided with at least one guide hole extending from front to back, and the rear wall of the square hole is provided with a guide pin that matches the guide hole.

[0013] Furthermore, the two adjacent sides of the small cube segment are connected by arc segments, and the curvature of at least two arc segments is different.

[0014] Furthermore, both the inner shell of the head and the outer shell of the base are provided with at least one optical fiber mounting hole extending in the front-to-back direction, and a mounting groove communicating with the rear end of at least one optical fiber mounting hole; the optical fiber contact is installed in the optical fiber mounting hole through a top stop positioning structure.

[0015] Furthermore, the front end of the optical fiber mounting hole is provided with a tapered chamfer.

[0016] Furthermore, the top-stop positioning structure includes a positioning spring installed in the optical fiber mounting hole and a limiting sleeve installed on the outer wall of the optical fiber contact. The positioning spring and the limiting sleeve cooperate to position the optical fiber contact.

[0017] Furthermore, a cover plate for fixing the positioning spring is installed in the mounting groove, a positioning groove is provided on the side wall of the mounting groove, and a positioning block that cooperates with the positioning groove is provided on the side wall of the cover plate.

[0018] Furthermore, the head shell is provided with an axial spring and a limiting plate. The limiting plate is fixed to the tail of the head shell, the front end of the axial spring rests on the inner shell of the head, and the rear end rests on the limiting plate.

[0019] Furthermore, cylindrical grooves for limiting the axial spring are provided on the opposite end faces of the inner shell of the head and the limiting plate.

[0020] Furthermore, the rear end of the limiting plate is provided with a protrusion, and the rear end of the head shell is provided with a groove that matches the protrusion.

[0021] Furthermore, the small cube segment is provided with a forward-extending limiting key, which, in conjunction with the limiting groove on the head shell, can prevent the inner shell of the head from deflecting within the head shell.

[0022] Furthermore, the optical fiber assembly also includes a sealing structure, which includes a first-stage sealing structure located at the tail of the inner shell of the head and / or the outer shell of the socket for sealing the conductor, and a second-stage sealing structure located at the front end of the socket for fitting into the plug end to seal the interface between the two in the plugged state.

[0023] Furthermore, the first-stage sealing structure includes a sealing line body disposed behind the cover plate, the sealing line body being glued and fixed to the cover plate.

[0024] Furthermore, the second-level sealing structure is an interface sealing gasket located close to the rear wall of the square hole in the socket, and a tapered elastic protrusion is provided on the front end surface of the interface sealing gasket at the position where the optical fiber contact is installed.

[0025] On the other hand, this utility model provides a heavy-duty connector, including a fixed frame and an optical fiber assembly installed in a rectangular mounting cavity within the fixed frame.

[0026] Furthermore, the outer wall of the head housing and / or the base housing is provided with a boss, and the inner wall of the fixed frame is provided with a groove that fits the boss with a gap, so as to ensure that the optical fiber assembly can float along the fixed frame.

[0027] Beneficial effects:

[0028] As described above, the optical fiber assembly and heavy-duty connector of this utility model have the following beneficial effects:

[0029] (1) The present invention designs the inner shell of the head and the outer shell of the base as a cuboid structure. The head and base adopt a square interface for mating. Compared with the use of a circular interface, it occupies less space. Moreover, when using optical fiber contacts of the same specifications, the number of square interfaces can be arranged more, resulting in a higher contact density. That is, the connector in the present invention has a high contact density while making reasonable use of the installation space and ensuring the required functions, which can facilitate the expansion of optical fiber capacity in the same module.

[0030] (2) Both the head shell and the rear section of the base shell are designed as cuboid structures, which can be installed in the rectangular mounting cavity of the original fixed frame without adjusting the structure of the fixed frame.

[0031] (3) The inner shell of the head of this utility model includes a small cuboid segment located at the front and a large cuboid segment coaxially located behind the small cuboid segment. A forward-extending limiting key is provided on the annular stop surface formed at the junction of the small cuboid segment and the large cuboid segment. This key prevents the inner shell of the head from rotating inside the outer shell of the head after assembly and plays a limiting role.

[0032] (4) In this utility model, the two adjacent sides of the small cube segment are connected by arc segments, and there are four arc segments in total. The curvature of the four arc segments is not exactly the same. This method can realize the precise positioning function of the plug and socket as well as the blind insertion function.

[0033] (5) In order to minimize the gap generated during plug installation and reduce costs, the inner shell of the head is integrally machined, combining the functions of a common shell and an insulator. The inner cavity of the shell is machined with fiber mounting holes to fix the fiber contact, which can reduce the number of installation parts and reduce the installation gap.

[0034] (6) This utility model has at least one guide hole extending forward and backward at the front of the small cuboid segment, and a guide pin is provided at the front end of the square hole in the housing. The guide pin can ensure the stable mating of the connector. Conventionally, in circular connectors, the key and keyway are used to achieve the guiding function, while the rectangular connector itself can achieve preliminary positioning and guidance by having a chamfer on the housing. However, due to the importance of guiding the fiber optic connector, this utility model adds the guidance of the guide pin. The guiding sequence during mating is housing-guide pin-fiber contact, which reduces the mating gap of the module, prevents excessive axial misalignment, and ensures fiber alignment.

[0035] (7) The fiber optic contact of this utility model is positioned in the fiber optic mounting hole of the head inner shell or the seat outer shell through 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 shell, which greatly improves the maintainability of the connector and has single-point maintainability of the optical cable.

[0036] (8) The optical fiber assembly 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 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.

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0038] 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.

[0039] Figure 1 This is a schematic diagram of the optical fiber assembly in this utility model.

[0040] Figure 2 This is one of the isometric views of the plug.

[0041] Figure 3 This is the second isometric view of the plug.

[0042] Figure 4 This is a cross-sectional view of the plug.

[0043] Figure 5 This is a schematic diagram of the head inner shell, axial spring, and limiting plate.

[0044] Figure 6 This is a schematic diagram of the limit plate.

[0045] Figure 7 This is an isometric view of the socket.

[0046] Figure 8 This is a cross-sectional view of the socket.

[0047] Figure 9 This is a schematic diagram of the outer shell.

[0048] The diagram shows the following markings: 1. Base shell, 101. Square hole, 2. Head shell, 201. Limiting groove, 202. Groove, 3. Head inner shell, 3-1. Small cuboid segment, 3-2. Large cuboid segment, 301. Guide hole, 302. Limiting key, 4. Cover plate, 401. Positioning block, 5. Sealing body, 501. Drum-shaped stepped hole, 6. Fiber optic contact, 7. Boss, 8. Limiting plate, 801. Protrusion, 9. Axial spring, 10. Positioning snap ring, 1001. Spring, 11. Cylindrical groove, 12. Fiber optic mounting hole, 13. Mounting groove, 1301. Positioning groove, 14. Guide pin, 15. Interface sealing gasket, 1501. Conical elastic protrusion, 16. Limiting sleeve. Detailed Implementation

[0049] 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.

[0050] 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.

[0051] This invention provides an optical fiber assembly and a heavy-duty connector. The heavy-duty connector includes a fixed frame (not shown in the figure) and an optical fiber assembly. Since the optical fiber assembly needs to be installed within the fixed frame of the heavy-duty connector, its installation size and maximum external dimensions are limited. The optical fiber assembly of this invention adopts a modular design, allowing it to be installed within the rectangular mounting cavity of the existing fixed 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 optical fiber assembly is described in detail below.

[0052] The fiber optic assembly includes a plug and a socket; please refer to [reference needed]. Figures 1 to 9 The plug includes a head shell 2, a head inner shell 3, an optical fiber contact 6, a cover plate 4, a sealing body 5, an axial spring 9, and a limiting plate 8. The head shell 2 is generally cuboid in shape, and the head inner shell 3 is generally cuboid in shape with different front and rear dimensions. Specifically, the head inner shell 3 includes a small cuboid segment 3-1 located at the front and a large cuboid segment 3-2 coaxially located at the rear of the small cuboid segment 3-1. The large cuboid segment 3-2 is housed inside the head shell 2, and the small cuboid segment 3-1 protrudes outside the head shell 2. The optical fiber contact 6 is installed inside the head inner shell 3. The socket includes a base shell 1, an optical fiber contact 6, a cover plate 4, and a sealing body 5. The base shell 1 is generally cuboid in shape with different front and rear dimensions. The front of the base shell 1 has a square hole 101 that mates with the small cuboid segment 3-1. The base shell 1 and the head inner shell 3 are connected through a matching square interface. The optical fiber contact 6 is installed inside the base shell 1. On the one hand, this invention designs the housing 1 and the inner housing 3 of the connector to interlock via a square interface. Compared to the commonly used circular interface, this further reduces the space occupied by the fiber optic assembly in the heavy-duty connector, facilitating subsequent expansion of the heavy-duty connector. On the other hand, this invention designs both the outer housing 2 of the connector and the inner housing 1 of the connector to be cuboid structures, allowing them to be installed within the rectangular mounting cavity of the existing fixed frame without adjusting the structure of the fixed frame. The outer housing 2 of the connector and the inner housing 1 of the connector are made of high-strength metal through machining and surface treatment, meeting the strength and salt spray requirements of the connector.

[0053] It should be noted that the outer wall of the head shell 2 and / or the seat shell 1 is provided with a boss 7, and the inner wall of the fixed frame is provided with a groove that fits the boss 7 with a clearance, so as to ensure that the fiber optic assembly can have the function of floating and self-aligning in the X, Y and Z directions when installed in the fixed frame.

[0054] To minimize gaps during plug installation and reduce costs, this invention features an inner shell 3 that is integrally machined, combining the functions of a standard shell and insulator. Functionally, it functions identically to a conventional plug. This not only reduces the number of installation parts but also incorporates a machined fiber optic mounting hole 12 within the shell cavity to secure the fiber optic contact 6, thus eliminating one installation gap. Please refer to [reference needed]. Figure 4 and Figure 7 This utility model has at least one guide hole 301 extending forward and backward at the front of the small cuboid segment 3-1. The rear wall of the square hole 101 in the housing 1 is provided with a guide pin 14 that matches the guide hole 301. The guide hole 301 and the guide pin 14 are used to guide the head and seat during docking, ensuring accurate guidance. The product adopts a two-stage guiding mechanism of housing and guide pin 14 to reduce the mating gap of the head and seat docking, prevent excessive axial wobble, and ensure optical fiber alignment.

[0055] In this utility model, please refer to Figure 2 The adjacent sides of the small cube segment 3-1 are connected by arc segments, totaling four arc segments: arc segment A, arc segment B, arc segment C, and arc segment D. The curvature of these four arc segments is not identical. This non-uniformity serves to prevent incorrect insertion. Furthermore, one of the arc segments (arc segment A) has a larger curvature, providing inlet guidance. Please refer to [reference needed]. Figure 2 and Figure 5 The annular stop surface formed at the junction of the small cuboid segment 3-1 and the large cuboid segment 3-2 is provided with a forward-extending limiting key 302, which cooperates with the limiting groove 201 on the head shell 2 to prevent the head inner shell 3 from deflecting.

[0056] In this utility model, please refer to Figures 1 to 6 The head housing 2 contains an axial spring 9 and a limiting plate 8. The limiting plate 8 has a protrusion 801 at its rear end, and the head housing 2 has a groove 202 matching the protrusion 801 at its rear end for limiting. The limiting plate 8 is fixed to the tail of the head housing 2 by fasteners. The front end of the axial spring 9 rests on the inner head housing 3, and the rear end rests on the limiting plate 8. Preferably, both the inner head housing 3 and the limiting plate 8 have cylindrical grooves 11 on their opposite end faces for limiting the axial spring 9. The axial spring 9 can generate axial compression, which, during the initial alignment and guidance process before the plug and socket are inserted, counteracts assembly and guidance tolerances of the housing, providing self-protection for the fiber optic assembly. When the inner head housing 3 is displaced relative to the head housing 2, the force generated by the compression of the axial spring 9 is applied to the inner head housing 3, keeping the plug and socket in a tight fit and ensuring reliable end-face contact of the fiber optic contact 6. The limiting plate 8 is used to fix the axial spring 9, preventing excessive axial compression that could cause the spring to malfunction.

[0057] Please refer to Figure 4 and Figure 8Both the inner shell 3 and the outer shell 1 of the head are provided with at least one optical fiber mounting hole 12 extending in the front-to-back direction, and a mounting groove 13 communicating with the rear end of at least one optical fiber mounting hole 12. The optical fiber contact 6 is positioned in the optical fiber mounting hole 12 of the inner shell 3 or the outer shell 1 of the head by a top-stop positioning structure. The front end of the optical fiber mounting hole 12 is provided with a tapered chamfer to guide the optical fiber contact 6. A cover plate 4 is provided in the mounting groove 13 for fixing the top-stop positioning structure. Specifically, the top-stop positioning structure includes a positioning spring 10 installed in the optical fiber mounting hole 12 and a limiting sleeve 16 fixedly installed on the outer wall of the optical fiber contact 6. One end of the positioning spring 10 abuts against the step on the inner wall of the optical fiber mounting hole 12, and the other end abuts against the cover plate 4, which improves the support strength of the positioning spring 10. The limiting sleeve 16 has an overall ring-shaped structure with a boss. The positioning spring 10 cooperates with the limiting sleeve 16 to position the fiber optic contact 6. The fiber optic contact 6 is fixed in the fiber optic mounting hole 12 by the positioning spring 10. A spring piece 1001 is provided on the positioning spring 10. When the fiber optic contact 6 is inserted into the correct position of the fiber optic mounting hole 12 using an insertion tool, the spring piece 1001 on the positioning spring 10 will lock the limiting sleeve 16 to fix the fiber optic contact 6 in the correct position. When it is necessary to remove the fiber optic contact 6, first remove the cover plate 4 from the inner shell 3 or the outer shell 1 of the head. Then, extend the removal tool to the positioning spring 10 from the rear end of the inner shell 3 or the outer shell 1 of the head. After the spring piece 1001 on the positioning spring 10 is expanded by the removal tool, the fiber optic contact 6 can be easily removed from the rear end of the fiber optic mounting hole 12, 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 6 in the plug and the socket are different. The optical fiber contact 6 in the socket contains a pin, while the optical fiber contact 6 in the plug contains a socket. This is prior art and will not be described in detail here.

[0058] Preferably, regarding the fixing method of the cover plate 4 to the head inner shell 3 or the seat outer shell 1, the four side walls of the mounting groove 13 of the head inner shell 3 or the seat outer shell 1 are provided with positioning grooves 1301. The sizes of the positioning grooves 1301 are not exactly the same. The side wall of the cover plate 4 is provided with positioning blocks 401 that cooperate with the positioning grooves 1301. By setting the positioning grooves 1301 and the positioning blocks 401, the cover plate 4 can be positioned. The positioning grooves 1301 can also be used as a solvent tank, so that the cover plate 4 and the head inner shell 3 or the seat outer shell 1 can become a uniform medium whole by adhesive bonding.

[0059] Preferably, the optical fiber contact 6 can also be a beam-expanding optical fiber contact, which 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.

[0060] As a preferred embodiment of this utility model, the optical fiber assembly 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 5 located behind the cover plate 4. Multiple drum-shaped stepped holes 501 are designed inside the sealing body 5, which can firmly clamp the passing lead wire. Simultaneously, by filling the space between the sealing body 5 at the tail and the headstock housing with silicone rubber, a seal between the cover plate 4 and the outside environment can be achieved. For holes where no optical fiber contact 6 is inserted, a dedicated sealing plug is designed to be inserted into the drum-shaped stepped holes 501 of the sealing body to achieve a sealing effect. To improve the sealing effect between the optical fiber contacts 6, an interface sealing gasket 15 is designed on the mating surface of the optical fiber contact 6 in the socket, and tapered elastic protrusions 1501 are designed around each individual pin. After the connector is inserted, the tapered elastic protrusion 1501 on one side of the pin is pressed together with the end face of the inner shell 3 in the connector, forming a sealing barrier between the fiber optic contacts 6, so that each pair of inserted fiber optic contacts 6 can achieve a sealing effect, thereby improving the environmental resistance of the connector.

[0061] The foregoing has provided a detailed description of an optical fiber assembly and heavy-duty connector provided by this utility model. Specific examples have been used to illustrate the principles and specific implementation methods of this utility model. The above embodiments are only used to help understand the method and core ideas 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. An optical fiber assembly, characterized in that, include: The plug includes a head shell (2) and a head inner shell (3). An optical fiber contact (6) is installed inside the head inner shell (3). With the plug end as the front end, the head shell (2) is a cuboid structure. The head inner shell (3) includes a small cuboid segment (3-1) located at the front end. The small cuboid segment (3-1) extends out of the head shell (2). The socket includes a base shell (1), which is a cuboid structure. An optical fiber contact (6) is installed inside the base shell (1). The front section of the base shell (1) is provided with a square hole (101) that fits into the small cuboid section. The base shell (1) and the head inner shell (3) are connected by a matching square interface.

2. The optical fiber assembly according to claim 1, characterized in that, The front part of the small cube segment (3-1) is provided with at least one guide hole (301) extending back and forth, and the rear wall of the square hole (101) is provided with a guide pin (14) that matches the guide hole (301).

3. The optical fiber assembly according to claim 1, characterized in that, The two adjacent sides of the small cube segment (3-1) are connected by arc segments, and the curvature of at least two arc segments is different.

4. The optical fiber assembly according to claim 1, characterized in that, The head inner shell (3) and the seat outer shell (1) are each provided with at least one optical fiber mounting hole (12) extending in the front-to-back direction, and a mounting groove (13) communicating with the rear end of at least one optical fiber mounting hole (12); the optical fiber contact (6) is installed in the optical fiber mounting hole (12) by a top stop positioning structure.

5. An optical fiber assembly according to claim 4, characterized in that, The front end of the fiber mounting hole (12) is provided with a tapered chamfer.

6. An optical fiber assembly according to claim 4, characterized in that, The top-stop positioning structure includes a positioning clasp (10) installed in the optical fiber mounting hole (12) and a limiting sleeve (16) fixedly installed on the outer wall of the optical fiber contact (6). The positioning clasp (10) and the limiting sleeve (16) cooperate to position the optical fiber contact (6).

7. An optical fiber assembly according to claim 6, characterized in that, The mounting groove (13) is equipped with a cover plate (4) for fixing the positioning spring (10). The side wall of the mounting groove (13) is provided with a positioning groove (1301), and the side wall of the cover plate (4) is provided with a positioning block (401) that cooperates with the positioning groove (1301).

8. An optical fiber assembly according to claim 1, characterized in that, The head shell (2) is provided with an axial spring (9) and a limiting plate (8). The limiting plate (8) is fixed to the tail of the head shell (2). The front end of the axial spring (9) rests on the inner shell (3) of the head, and the rear end rests on the limiting plate (8).

9. An optical fiber assembly according to claim 8, characterized in that, The inner shell (3) and the limiting plate (8) are provided with cylindrical grooves (11) for limiting the axial spring (9) on their opposite end faces.

10. An optical fiber assembly according to claim 8, characterized in that, The rear end of the limiting plate (8) is provided with a protrusion (801), and the rear end of the head shell (2) is provided with a groove (202) that matches the protrusion (801).

11. An optical fiber assembly according to claim 1, characterized in that, The small cube segment (3-1) is provided with a forward-extending limiting key (302), which cooperates with the limiting groove (201) on the head shell (2) to prevent the head inner shell (3) from deflecting in the head shell (2).

12. An optical fiber assembly according to claim 7, characterized in that, The optical fiber assembly also includes a sealing structure, which includes a first-stage sealing structure located at the tail of the head inner shell (3) and / or the seat outer shell (1) for sealing the wire, and a second-stage sealing structure located at the front end of the socket for fitting into the plug end to seal the interface between the two in the plugged state.

13. An optical fiber assembly according to claim 12, characterized in that, The first-stage sealing structure includes a sealing line body (5) located behind the cover plate (4), and the sealing line body (5) is glued to the cover plate (4).

14. An optical fiber assembly according to claim 12, characterized in that, The second-level sealing structure is an interface sealing gasket (15) set close to the rear wall of the square hole (101) in the socket. The front end surface of the interface sealing gasket (15) is provided with a tapered elastic protrusion (1501) at the position where the optical fiber contact (6) is installed.

15. A heavy-duty connector, characterized in that, Includes a fixed frame and an optical fiber assembly as described in any one of claims 1-14, mounted within a rectangular mounting cavity in the fixed frame.

16. A heavy-duty connector according to claim 15, characterized in that, The outer walls of the head housing (2) and / or the seat housing (1) are provided with bosses (7), and the inner walls of the fixed frame are provided with grooves that fit the bosses (7) to ensure that the fiber optic assembly can float along the fixed frame.

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