MPO connector combination structure

Abstract

The invention discloses an MPO connector combination structure, and belongs to the technical field of optical fiber communication. The connecting buckle is configured to be of a sleeve structure, the outer wall of the connecting buckle is at least provided with a first limiting part, and the connecting buckle is coaxially installed on the plug assembly; a first locking groove is formed in the first dustproof cap; in a first combination state, the first dustproof cap is sleeved on the plug assembly and the dustproof piece, and the first limiting part is embedded into the first locking groove; a second locking groove is formed in the second dustproof cap, and the outer diameter of the first dustproof cap is different from that of the second dustproof cap; in a second combination state, the second dustproof cap is sleeved on the plug assembly and the dustproof piece, and the first limiting part is embedded into the second locking groove; the MPO connector combined structure is provided with two kinds of dustproof caps (namely the first dustproof cap and the second dustproof cap) which can be used alternately, so that the MPO connector can adapt to more different use environments and working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to an MPO connector combination structure. Background Art

[0002] Existing MPO connectors generally use a single dust cap design, which is difficult to meet the protection level requirements in different environments. For example, in environments with small spaces or high cleanliness requirements, the existing dust cap structure is difficult to meet application requirements. At the same time, the dust cap of this type of connector may accidentally fall off in frequent plugging, unplugging, handling or vibration environments, affecting the sealing performance of the connector and the stability of the core electrical connection.

[0003] At present, some MPO connectors try to use different types of dust caps to meet the needs of specific use environments, but most of them adopt a new structural design or use different types of buckles, which increases the complexity and cost of production, and operators also need to learn new installation processes. This design method lacks versatility and scalability.

[0004] Therefore, it is urgent to develop an MPO connector combination structure that can flexibly cope with different usage environments while having high protection performance, easy operability and low production cost. Summary of the invention

[0005] The embodiment of the present invention provides an MPO connector assembly structure to solve the problems in the prior art.

[0006] The embodiment of the present invention adopts the following technical scheme: an MPO connector combination structure, having a first combination state and a second combination state, the connector combination structure comprising: a plug assembly, mounted at the end of a cable and electrically connected to a core body inside the cable, the plug assembly having a detachable dustproof member to seal and protect the core body; a connecting buckle, configured as a sleeve structure, an outer wall of which has at least one first limiting portion, the connecting buckle is coaxially mounted on the plug assembly; a first dust cap having a first locking groove inside; in the first combination state, the first dust cap is sleeved on the plug assembly and the dustproof member, and the first limiting portion is embedded in the first locking groove to achieve axial limiting of the first dust cap and the connecting buckle; a second dust cap having a second locking groove inside, the first dust cap and the second dust cap having different outer diameters; in the second combination state, the second dust cap is sleeved on the plug assembly and the dustproof member, and the first limiting portion is embedded in the second locking groove to achieve axial limiting of the first dust cap and the connecting buckle.

[0007] Preferably, the outer wall of the connecting buckle is provided with a groove extending into the interior thereof, and an arc-shaped spring sheet structure is formed on the outer wall of the connecting buckle through the division of the groove, and the first limiting portion is located on the spring sheet structure, and an avoidance groove is also provided on the plug assembly; when the first dust cap is sleeved on the connecting buckle, the first limiting portion is squeezed so that the free end of the spring sheet structure can move into the avoidance groove; when the first limiting portion moves to the first locking groove, the spring sheet structure is reset and the first limiting portion is embedded in the first locking groove.

[0008] Preferably, the outer wall of the connecting buckle is provided with a groove extending into the interior thereof, and an arc-shaped spring sheet structure is formed on the outer wall of the connecting buckle through the division of the groove, and the first limiting portion is located on the spring sheet structure, and an avoidance groove is also provided on the plug assembly; when the second dust cap is sleeved on the connecting buckle, the first limiting portion is squeezed so that the free end of the spring sheet structure can move into the avoidance groove; when the first limiting portion moves to the second locking groove, the spring sheet structure is reset and the first limiting portion is embedded in the second locking groove.

[0009] Preferably, a side of the first limiting portion facing the insertion direction of the first dust cap or the second dust cap is arranged as a first chamfered surface.

[0010] Preferably, one side edge of the first limiting portion is arranged as a second chamfered surface, so that when the first dust cap or the second dust cap rotates, the second chamfered surface is squeezed to drive the free end of the spring structure to move and enter the avoidance groove.

[0011] Preferably, the inner side wall of the second dust cap is provided with a guide block extending along its axial direction, and the plug assembly is provided with a guide groove; when the second dust cap is inserted into the plug assembly, the guide block slides into the guide groove to achieve circumferential limitation of the second dust cap relative to the plug assembly.

[0012] Preferably, the first dust cap comprises: an end cap, on which the first locking groove is located, and the top of the end cap is configured as a first externally threaded end; an internally threaded sleeve, threadedly connected to the first externally threaded end, and the inner side wall of the internally threaded sleeve is formed with a first limiting wall; a rotating head, consisting of a rotating part and a hanging part, the rotating part is rotatably arranged in the internally threaded sleeve and is located between the first limiting wall and the end cap to achieve axial limitation of the rotating head, and the hanging part extends out of the internally threaded sleeve.

[0013] Preferably, the second dust cap comprises: a middle shell, whose main structure is in the shape of a sleeve, the second locking groove is located on the middle shell, and the outer wall of the middle shell is also provided with a raised second limiting portion; an outer shell, which is sleeved on the outer side of the middle shell, and the inner wall of the outer shell has an internal thread groove and a second limiting wall located at one side end of the internal thread groove; a sealing cap, the opening end of the sealing cap is configured as a second external thread end, the outer shell is at least partially sleeved on the middle shell, and the second external thread end is threadedly connected to the internal thread groove, and the second external thread end cooperates with the thread of the internal thread groove to force the second limiting wall to abut against the second limiting portion.

[0014] Preferably, at least one first annular groove coaxial with the middle shell is further provided on the outer wall thereof, and a first sealing ring is installed in the first annular groove to achieve sealing contact between the middle shell and the outer shell; the second external thread end edge is also provided with a second annular groove coaxial with the middle shell, and a second sealing ring is installed in the second annular groove to achieve sealing contact between the outer shell and the sealing cap.

[0015] At least one of the above technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: First, the MPO connector combination structure has two dust caps that can be used interchangeably (i.e., the first dust cap and the second dust cap), so that the MPO connector can adapt to more different use environments and working conditions. For example, in different installation spaces and operating scenarios with different cleanliness requirements, corresponding dust caps can be selected as needed to provide an appropriate level of protection for the core body and minimize external factors from interfering with the connection performance. In actual applications, the diameter of the first dust cap is smaller than that of the second dust cap. Therefore, when used for fiber optic cable conduit, the use of the first dust cap can improve the penetration of the MPO connector.

[0016] Secondly, the lock slot-limiting part cooperation between the connection buckle and the dust cap realizes precise axial limit. This stable connection can effectively prevent the dust cap from accidentally falling off, and can continuously maintain the sealing protection of the plug assembly even in frequent plugging, unplugging, transportation or vibration environment, ensuring that the internal core is in a clean and stable electrical connection environment for a long time.

[0017] Third, the two dust caps have the same installation structure, so operators can easily switch between different dust caps without having to learn complicated installation procedures. In addition, the different outer diameters make it easier to distinguish them with the naked eye, further reducing misoperation; the unified installation structure means that in the manufacturing process, mold design is simpler, parts are more versatile, and production costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 An exploded view of the plug assembly and the connecting buckle of the present invention; Figure 3 It is a structural schematic diagram of the first combination state of the present invention; Figure 4 It is a schematic diagram of assembling the first dust cap of the present invention; Figure 5 It is a structural schematic diagram of the second combination state of the present invention; Figure 6 It is a schematic diagram of assembling the second dust cap of the present invention; Figure 7 It is a schematic diagram of assembling the plug assembly and the middle shell of the present invention; Figure 8 It is a schematic diagram of assembling the shell and the connecting buckle in the present invention; Fig. 9 It is a schematic diagram of assembling the end cap and the connecting buckle of the present invention; Fig.10 It is a side view of the connecting buckle of the present invention.

[0019] Reference numerals 1-plug assembly; 11-dustproof piece; 12-avoidance groove; 13-guide groove; 14-spindle tube; 15-cable fixing sleeve; 16-tail sleeve; 17-insertion structure; 18-heat shrink tube; 2-connection buckle; 21-first limit part; 211-first chamfered surface; 212-second chamfered surface; 22-slot; 23-spring structure; 24-bump; 3-first dust cap; 31-end cap; 311-first locking groove; 312-first external thread end; 32-internal thread Sleeve; 321-first limiting wall; 33-rotating head; 331-rotating part; 332-hanging part; 4-second dust cap; 41-middle shell; 411-second locking groove; 412-guide block; 413-second limiting part; 414-first annular groove; 415-first sealing ring; 42-outer shell; 421-internal thread groove; 422-second limiting wall; 43-sealing cap; 431-second external thread end; 432-second annular groove; 433-second sealing ring. DETAILED DESCRIPTION

[0020] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0021] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] Reference Figures 1 to 10 As shown, an embodiment of the present invention provides an MPO connector combination structure having a first combination state and a second combination state, the connector combination structure comprising a plug assembly 1, a connecting buckle 2, a first dust cap 3 and a second dust cap 4, wherein the first dust cap 3 and the second dust cap 4 are used alternately, that is, the first dust cap 3 is used in the first combination state, and the second dust cap 4 is used in the second combination state.

[0023] The plug assembly 1 is a key part for connecting the cable with the external device. It is installed at the end of the cable and is electrically connected to the core inside the cable. The plug assembly 1 has a detachable dustproof part 11 to seal and protect the core. The detachable dustproof part 11 can initially protect the core from erosion by impurities such as dust and water vapor when no additional dust cap is used.

[0024] The connecting buckle 2 is configured as a sleeve structure, and its outer wall has at least one first limiting portion 21. The connecting buckle 2 is coaxially installed on the plug assembly 1; the first limiting portion 21 of the outer wall is a key structure for subsequently achieving stable installation of the dust cap. It is coaxially sleeved on the plug assembly 1 to provide a positioning reference and limiting support for the dust cap.

[0025] The first dust cap 3 has a first locking groove 311 therein; in the first assembly state, the first dust cap 3 is sleeved on the plug assembly 1 and the dustproof member 11, and the first limiting portion 21 is embedded in the first locking groove 311, so as to achieve axial limiting of the first dust cap 3 and the connecting buckle 2; The second dust cap 4 has a second locking groove 411 inside, and the outer diameters of the first dust cap 3 and the second dust cap 4 are different; in the second combined state, the second dust cap 4 is sleeved on the plug assembly 1 and the dustproof part 11, and the first limiting portion 21 is embedded in the second locking groove 411 to achieve axial limitation of the first dust cap 3 and the connecting buckle 2.

[0026] In this embodiment, the MPO connector combination structure has two dust caps (i.e., the first dust cap 3 and the second dust cap 4) that can be used interchangeably, so that the MPO connector can adapt to more different use environments and working conditions. For example, in different installation spaces and operating scenarios with different cleanliness requirements, corresponding dust caps can be selected as needed to provide an adaptive protection level for the core body and minimize the interference of external factors on the connection performance. In actual applications, the diameter of the first dust cap 3 is smaller than the diameter of the second dust cap 4. Therefore, when used for optical fiber cable conduit, the use of the first dust cap 3 can improve the penetration of the MPO connector.

[0027] The lock slot-limiting part cooperation between the connection buckle 2 and the dust cap realizes precise axial limiting. This stable connection can effectively prevent the dust cap from accidentally falling off, and can continuously maintain the sealing protection of the plug assembly 1 even in frequent plugging, unplugging, transportation or vibration environment, ensuring that the internal core is in a clean and stable electrical connection environment for a long time.

[0028] At the same time, the two dust caps have the same installation structure, so operators can easily switch between different dust caps without having to learn complicated installation procedures. In addition, the different outer diameters make it easier to distinguish them with the naked eye, further reducing misoperation; the unified installation structure means that in the production and manufacturing process, mold design is simpler, parts are more versatile, and production costs are reduced.

[0029] In some practical applications, refer to Figure 1 , Figure 2 , Figure 8 and Fig. 9 As shown, the outer peripheral wall of the connecting buckle 2 is provided with a slot 22 penetrating into the inside thereof, and an arc-shaped spring structure 23 is formed on the outer peripheral wall of the connecting buckle 2 by the division of the slot 22. The first limiting portion 21 is located on the spring structure 23, and the plug assembly 1 is also provided with an avoidance groove 12; the first dust cap 3 and the second dust cap 4 can be assembled with the help of the structure of the connecting buckle 2, as follows: When the first dust cap 3 is sleeved on the connecting buckle 2, the first limiting portion 21 is pressed, so that the free end of the spring structure 23 moves into the avoidance groove 12; when the first limiting portion 21 moves to the first locking groove 311, the spring structure 23 is reset, and the first limiting portion 21 is embedded in the first locking groove 311; When the second dust cap 4 is sleeved on the connecting buckle 2, the first limiting portion 21 is squeezed so that the free end of the spring structure 23 moves into the avoidance groove 12; when the first limiting portion 21 moves to the second locking groove 411, the spring structure 23 is reset and the first limiting portion 21 is embedded in the second locking groove 411.

[0030] In this embodiment, both the first dust cap 3 and the second dust cap 4 will squeeze the first limiting portion 21 on the spring structure 23 when they are sleeved on the connecting buckle 2. Affected by the squeezing force, the free end of the spring structure 23 bends and enters the avoidance groove 12, so that the dust cap can smoothly move down along the connecting buckle 2 and continue the sleeve action. As the sleeve depth of the dust cap increases, when the first limiting portion 21 moves to the corresponding lock slot position 22 (the first dust cap 3 corresponds to the first lock slot 311, and the second dust cap 4 corresponds to the second lock slot 411), the squeezing force on the spring structure 23 disappears. At this time, the spring structure 23 quickly resets by relying on its own elasticity, accurately embeds the first limiting portion 21 into the corresponding lock slot, achieves a stable axial limit, and tightly fixes the dust cap around the connecting buckle 2 and the plug assembly 1.

[0031] The same set of elastic structures of the connecting buckle 2 is adapted to two different dust caps. Operators do not need to distinguish between different installation processes and structures, which reduces the complexity of operation and the probability of errors. On the production line, workers can complete assembly tasks more efficiently; at the equipment maintenance site, operation and maintenance personnel can also replace dust caps more conveniently without being troubled by the type of dust caps. The stable positioning brought by the resetting of the spring clip ensures that the dust cap is tightly connected to the connecting buckle 2, creating a stable protective environment for the internal optical fiber core. The gentle elastic assembly method reduces the rigid friction and collision between the components, reduces the wear of the connecting buckle 2, dust cap, and plug assembly 1 caused by repeated installation and disassembly, and extends the service life of the entire MPO connector combination structure.

[0032] In addition, the inner end of the spring structure 23 further has a protrusion 24 , and the protrusion 24 always abuts against a side end of the corresponding avoidance groove 12 to achieve axial limitation of the connection buckle 2 relative to the plug assembly 1 .

[0033] In some practical applications, refer to Figures 7 to 10 As shown, the first limit portion 21 is provided with a first chamfered surface 211 on one side facing the insertion direction of the first dust cap 3 or the second dust cap 4. When the first dust cap 3 or the second dust cap 4 is inserted toward the connecting buckle 2, the first chamfered surface 211 facing the insertion direction is equivalent to a "guiding slope". Due to the existence of the first chamfered surface 211, the dust cap will not encounter abrupt obstruction at the initial stage of contacting the first limit portion 21, but will slowly squeeze the spring sheet structure 23 along the chamfered surface, which greatly reduces the difficulty of inserting the dust cap.

[0034] In some practical applications, the structure of the connecting buckle 2 is based on the above-mentioned first chamfered surface 211, and one side edge of the first limiting portion 21 is set as the second chamfered surface 212, so that when the first dust cap 3 or the second dust cap 4 rotates, the second chamfered surface 212 is squeezed to drive the free end of the spring structure 23 to move and enter the avoidance groove 12.

[0035] When the first dust cap 3 or the second dust cap 4 is to be removed, a rotational force is applied thereto. Since the first limiting portion 21 is provided with a second chamfered surface 212, during the rotation process, the edge of the dust cap (i.e., the side wall of the first locking groove 311 or the second locking groove 411) is in extrusion contact with the second chamfered surface 212. This causes the free end of the spring structure 23 to move toward the avoidance groove 12. Once the spring is deformed by force, the first limiting portion 21 originally embedded in the locking groove will loosen, releasing the axial limit on the dust cap, so that the dust cap can be easily removed from the connecting buckle 2. Quick and convenient disassembly is achieved, and the entire operation only relies on a simple rotation action without the assistance of additional complex tools.

[0036] Based on the second chamfered surface 212, the inner side wall of the second dust cap 4 can also be provided with a guide block 412 extending along its axial direction, and the plug assembly 1 is provided with a guide groove 13; when the second dust cap 4 is inserted into the plug assembly 1, the guide block 412 slides into the guide groove 13 to achieve the circumferential limitation of the second dust cap 4 relative to the plug assembly 1. In practical applications, that is, when used in the field of optical fiber cables, the first dust cap 3 is used for pipe threading, which is convenient for use during pipe threading operations and adapts to narrow pipe threading spaces; after the pipe threading is completed and reaches the installation site, the second dust cap 4 is replaced. Due to the circumferential limitation of the guide block 412 and the guide groove 13, the second dust cap 4 cannot rotate at will. Combined with the axial locking structure on the connection buckle 2 mentioned above, the second dust cap 4 is firmly fixed in place under double protection, providing a reliable closed environment for subsequent optical fiber connection operations and long-term protection, preventing dust and water vapor from intruding, and ensuring optical fiber transmission performance.

[0037] Differentiate the functions of the first dust cap 3 and the second dust cap 4, and make the connection between the two key construction links of pipe threading and installation smoother.

[0038] In some practical applications, refer to Figure 3 to Figure 4 As shown, the structure of the first dust cap 3 is optimized and designed, and the first dust cap 3 is composed of an end cap 31 , an internal thread sleeve 32 and a rotating head 33 .

[0039] The first locking groove 311 is located on the end cap 31, and the top of the end cap 31 is configured as a first external threaded end 312; the internal threaded sleeve 32 is threadedly connected to the first external threaded end 312, and the inner side wall of the internal threaded sleeve 32 is formed with a first limiting wall 321; the rotating head 33 is composed of a rotating part 331 and a hanging part 332, the rotating part 331 is rotatably arranged in the internal threaded sleeve 32 and is located between the first limiting wall 321 and the end cap 31 to realize the axial limitation of the rotating head 33, and the hanging part 332 extends out of the internal threaded sleeve 32.

[0040] When performing pipe threading operations in the field of optical fiber cables, the pipe threading environment is often narrow and complex, and it is difficult to push the optical fiber cables and dust caps by hand. A traction machine is often used to pull them to move in the pipe. The hanging part 332 of the rotating head 33 extends out of the internal threaded sleeve 32, providing a reliable connection point for the rope. The operator can tie the rope to the hanging part 332, and then use the traction of the rope to pull the first dust cap 3 and the optical fiber cable through the pipe. When the rope pulls the first dust cap 3 and the cable forward in the pipe, the rotating part 331 of the rotating head 33 can freely rotate around its own axis in the internal threaded sleeve 32 when the hanging rope is stressed, so as to prevent damage to the core structure inside the optical fiber cable due to excessive torsion and maintain the transmission performance of the optical fiber.

[0041] In some practical applications, refer to Figures 5 and 6 As shown, the structure of the second dust cap 4 is optimized and designed, and the second dust cap 4 includes a middle shell 41, an outer shell 42, and a sealing cap 43. The main structure of the middle shell 41 is in the shape of a shaft sleeve, and the second locking groove 411 is located on the middle shell 41. The outer wall of the middle shell 41 is also provided with a raised second limiting portion 413; the outer shell 42 is sleeved on the outside of the middle shell 41, and the inner wall of the outer shell 42 has an internal thread groove 421 and a second limiting wall 422 located at one side of the internal thread groove 421; the opening end of the sealing cap 43 is configured as a second external thread end 431, and the outer shell 42 is at least partially sleeved on the middle shell 41, and the second external thread end 431 is threadedly connected in the internal thread groove 421, and the second external thread end 431 is threadedly engaged with the thread of the internal thread groove 421 to force the second limiting wall 422 to abut against the second limiting portion 413.

[0042] In this embodiment, the second dust cap 4 adopts a multi-layer nested structure of a middle shell 41, an outer shell 42, and a sealing cap 43. When the second external thread end 431 of the middle shell 41 is screwed into the internal thread groove 421 of the outer shell 42, as the thread is gradually tightened, the axial propulsion force will drive the outer shell 42 to move along the outer wall of the middle shell 41. Since the inner wall of the outer shell 42 is provided with a second limiting wall 422, and the outer wall of the middle shell 41 has a corresponding second limiting portion 413, during the process of screwing in the thread, the second limiting wall 422 will gradually approach and finally press against the second limiting portion 413 to achieve precise axial positioning. This method of converting thread transmission into axial limiting force cleverly combines the components tightly together.

[0043] The middle shell 41 is a key part that supports the second locking groove 411 and is responsible for completing the locking cooperation with the connecting buckle 2; the outer shell 42 wraps the middle shell 41 from the outside to enhance the mechanical strength of the overall structure and resist possible external collision and extrusion; the sealing cap 43 is connected by a thread, which not only seals the open end of the dust cap, but also provides power for the outer shell 42 to limit the middle shell 41, providing a reliable closed protection environment for the internal optical fiber.

[0044] When the second dust cap 4 needs to be inspected or replaced, the maintenance personnel only need to reversely rotate the sealing cap 43 in the reverse order of assembly to easily separate the components, thereby reducing the difficulty and time cost of maintenance.

[0045] Taking into account the sealing performance between the various accessories of the second dust cap 4, in some practical applications, the following scheme is adopted: at least one first annular groove 414 coaxial with the middle shell 41 is also provided on the outer wall of the middle shell 41, and a first sealing ring 415 is installed in the first annular groove 414 to achieve a sealed contact between the middle shell 41 and the outer shell 42; the edge of the second external thread end 431 is also provided with a second annular groove 432 coaxial with the middle shell 41, and a second sealing ring 433 is installed in the second annular groove 432 to achieve a sealed contact between the outer shell 42 and the sealing cap 43.

[0046] The plug assembly 1 described above is a prior art and will not be described in detail. Figures 1 to 3 As shown, it generally mainly includes a main shaft tube 14, an optical cable fixing sleeve 15, a tail sleeve 16 and a core insert structure 17 located inside the main shaft tube 14 (the specific structure and installation method of the core insert structure 17 are not introduced in detail). The optical cable fixing sleeve 15 is coaxially arranged at the tail of the main shaft tube 14 and is clamped therewith. A heat shrink tube 18 is also installed on the outside of the tail of the main shaft tube 14, and the tail sleeve 16 is sleeved on the outside of the heat shrink tube 18 in a fixed or clamped manner.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An MPO connector assembly structure, characterized in that: The connector assembly structure has a first assembly state and a second assembly state, and includes: A plug assembly (1) is installed at the end of the cable and is electrically connected to a core body inside the cable, wherein the plug assembly (1) has a detachable dustproof part (11) to seal and protect the core body; The connecting buckle (2) is configured as a sleeve structure, the outer wall of which has at least one first limiting portion (21), and the connecting buckle (2) is coaxially mounted on the plug assembly (1); A first dust cap (3) having a first locking groove (311) therein; in a first assembled state, the first dust cap (3) is sleeved on the plug assembly (1) and the dustproof member (11), and the first limiting portion (21) is embedded in the first locking groove (311), so as to achieve axial limiting of the first dust cap (3) and the connecting buckle (2); The second dust cap (4) has a second locking groove (411) inside, and the first dust cap (3) and the second dust cap (4) have different outer diameters; in the second combined state, the second dust cap (4) is sleeved on the plug assembly (1) and the dustproof member (11), and the first limiting portion (21) is embedded in the second locking groove (411), so as to achieve axial limiting of the first dust cap (3) and the connecting buckle (2).

2. The MPO connector assembly structure according to claim 1, characterized in that: The outer wall of the connecting buckle (2) is provided with a slot (22) penetrating into the interior thereof, and an arc-shaped spring sheet structure (23) is formed on the outer wall of the connecting buckle (2) through the division of the slot (22); the first limiting portion (21) is located on the spring sheet structure (23), and the plug assembly (1) is also provided with an avoidance groove (12); when the first dust cap (3) is sleeved on the connecting buckle (2), the first limiting portion (21) is pressed so that the free end of the spring sheet structure (23) moves into the avoidance groove (12); when the first limiting portion (21) moves to the first locking groove (311), the spring sheet structure (23) is reset, and the first limiting portion (21) is embedded in the first locking groove (311).

3. The MPO connector assembly structure according to claim 1, characterized in that: The outer wall of the connecting buckle (2) is provided with a slot (22) penetrating into the interior thereof, and an arc-shaped spring sheet structure (23) is formed on the outer wall of the connecting buckle (2) through the division of the slot (22); the first limiting portion (21) is located on the spring sheet structure (23), and the plug assembly (1) is also provided with an escape groove (12); when the second dust cap (4) is sleeved on the connecting buckle (2), the first limiting portion (21) is pressed so that the free end of the spring sheet structure (23) moves into the escape groove (12); when the first limiting portion (21) moves to the second locking groove (411), the spring sheet structure (23) is reset, and the first limiting portion (21) is embedded in the second locking groove (411).

4. An MPO connector assembly structure according to claim 2 or 3, characterized in that: A side of the first limiting portion (21) facing the insertion direction of the first dust cap (3) or the second dust cap (4) is provided as a first chamfered surface (211).

5. The MPO connector assembly structure according to claim 4, characterized in that: One side edge of the first limiting portion (21) is arranged as a second chamfered surface (212), so that when the first dust cap (3) or the second dust cap (4) rotates, the second chamfered surface (212) is pressed to drive the free end of the spring structure (23) to move and enter the avoidance groove (12).

6. The MPO connector assembly structure according to claim 5, characterized in that: The inner side wall of the second dust cap (4) is provided with a guide block (412) extending along its axial direction, and the plug assembly (1) is provided with a guide groove (13); when the second dust cap (4) is inserted into the plug assembly (1), the guide block (412) slides into the guide groove (13) to achieve circumferential limitation of the second dust cap (4) relative to the plug assembly (1).

7. The MPO connector assembly structure according to claim 1, characterized in that: The first dust cap (3) comprises: An end cap (31), the first locking groove (311) being located on the end cap (31), and the top of the end cap (31) being configured as a first external thread end (312); An internal thread sleeve (32) is threadably connected to the first external thread end (312), and a first limiting wall (321) is formed on an inner side wall of the internal thread sleeve (32); The rotating head (33) comprises a rotating portion (331) and a hanging portion (332); the rotating portion (331) is rotatably disposed in the internal thread sleeve (32) and is located between the first limiting wall (321) and the end cap (31) to achieve axial limiting of the rotating head (33); and the hanging portion (332) extends out of the internal thread sleeve (32).

8. The MPO connector assembly structure according to claim 1, characterized in that: The second dust cap (4) comprises: The middle shell (41) has a main structure in the shape of a shaft sleeve, the second locking groove (411) is located on the middle shell (41), and the outer wall of the middle shell (41) is further provided with a protruding second limiting portion (413); An outer shell (42) is sleeved on the outer side of the middle shell (41), and an inner wall of the outer shell (42) has an internal thread groove (421) and a second limiting wall (422) located at one side end of the internal thread groove (421); A sealing cap (43), wherein the opening end of the sealing cap (43) is configured as a second external threaded end (431), the outer shell (42) is at least partially sleeved on the middle shell (41), and the second external threaded end (431) is threadedly connected to the inner thread groove (421), and the second external threaded end (431) is threadedly engaged with the inner thread groove (421) to force the second limiting wall (422) to abut against the second limiting portion (413).

9. The MPO connector assembly structure according to claim 1, characterized in that: The outer wall of the middle shell (41) is also provided with at least one first annular groove (414) coaxial therewith, and a first sealing ring (415) is installed in the first annular groove (414) to achieve sealing contact between the middle shell (41) and the outer shell (42); the edge of the second external thread end (431) is also provided with a second annular groove (432) coaxial therewith, and a second sealing ring (433) is installed in the second annular groove (432) to achieve sealing contact between the outer shell (42) and the sealing cap (43).

10. An MPO connector assembly structure according to claim 2 or 3, characterized in that: The inner end of the spring structure (23) has a protrusion (24), and the protrusion (24) always abuts against an inner side end of the corresponding avoidance groove (12) to achieve axial limiting of the connection buckle (2) relative to the plug assembly (1).

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