Optical fiber switching device

Abstract

The present invention relates to the technical field of optical fiber connectors, and specifically to an optical fiber switching device, including an adapter and a connecting mechanism; the adapter is located between two plug assemblies, and a fixed tube is fixedly arranged in the adapter; the plug assembly includes a shell and a plug core; the connecting mechanism is arranged in pairs and symmetrically in the fixed tube, including a concentric assembly and a transmission assembly; the concentric assembly includes at least three discs that are sequentially arranged along the axial direction of the fixed tube, and each disc is provided with a threading hole. Before the plug assembly is plugged in, the multiple threading holes of the concentric assembly are blocked to prevent dust from entering. When the plug core of the plug assembly moves into the fixed tube, the transmission assembly pushes the disc to move, so that the multiple threading holes overlap and open, allowing the plug core to pass through and complete the connection; the plug core is limited and fixed by using the mutual misalignment of the multiple threading holes, so that the plug core and the fixed tube remain coaxial, ensuring that the plug cores of the two plug assemblies can be connected in a concentric state, reducing the optical loss at the connection.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber connectors, and in particular to an optical fiber switching device. Background Art

[0002] The connection and signal transmission between different optical fibers require the help of a switching device, such as a fiber optic connector. When connecting optical fibers, it is necessary not only to ensure that the connection between the two optical fibers is reliable, but also to minimize the optical loss at the connection. In the prior art, a combination of elastic parts and snap connections is usually used to connect the plug and the interface to prevent accidental contact and detachment. For example, Chinese patent CN116908968B discloses an optical fiber connector with an anti-accidental contact and detachment function. Through an elastic pushing mechanism and a hooking groove, the first card block can be connected to the first interface and the first card interface respectively, and the connection between the locking block and the hooking groove is strengthened through the connection of the first elastic part. On the basis of reliable connection, it is also necessary to ensure that the two optical fibers are concentrically connected to reduce the optical loss at the connection. Summary of the invention

[0003] The invention provides an optical fiber exchange switching device to solve the problem that it is difficult to ensure the concentricity of optical fiber butt connection in the existing optical fiber connector.

[0004] An optical fiber switching device of the present invention adopts the following technical solution:

[0005] A fiber optic switching device, used to connect two plug assemblies, including an adapter and a connecting mechanism; the adapter is located between the two plug assemblies, and a fixed tube is fixedly arranged in the adapter; the plug assembly includes a shell and a ferrule fixed in the shell, and the two plug assembly ferrules are connected in the fixed tube along the axial direction of the fixed tube; the connecting mechanisms are arranged in pairs and symmetrically in the fixed tube, and each connecting mechanism corresponds to a plug assembly; the connecting mechanism includes a connecting piece, a concentric assembly and a transmission assembly; the connecting piece is fixed in the fixed tube; the concentric assembly includes at least three discs that are sequentially arranged along the axial direction of the fixed tube, and each disc is provided with a threading hole; the axis of the disc is parallel to the axis of the fixed tube, and each disc is slidably installed on the connecting piece along its radial direction, and the sliding of at least three discs The moving path is radially distributed with the axis of the fixed tube as the center; the concentric assembly has a blocking state and a locking state; in the blocking state, at least three disks of the concentric assembly are coaxial with the fixed tube, and the threading holes on each disk are not connected to each other; in the locked state, at least three disks of the concentric assembly are not coaxial, and multiple threading holes partially overlap, and the overlapping part corresponds to the size of the plug core; the disk moves from a position coaxial with the fixed tube to a direction away from the axis of the fixed tube, so that the concentric assembly switches from the blocking state to the locking state, and during the movement of the disk, the overlapping part of the multiple threading holes first increases and then decreases; in the initial state, the concentric assembly is in a blocking state; when the plug core of the plug assembly moves into the fixed tube, the transmission assembly pushes the disk to move, so that the concentric assembly switches to the locking state.

[0006] Optionally, an air bag is provided on the inner wall of each threading hole, and the air bag is used to contact the insert core.

[0007] Optionally, the insert includes a core and a ring, the ring is fixed to the outside of the core, and one end of the core close to the adapter protrudes compared to the ring; the core is used to pass through the threading hole to contact the core of another plug assembly, and the ring is used to push the disc to move through the transmission assembly.

[0008] Optionally, the transmission assembly includes a rotating drum and a movable ring; the rotating drum is coaxial with the distribution center of at least three disks; the rotating drum is rotatably installed on the connecting piece and is restricted by the connecting piece to move axially along the fixed tube; the rotating drum is located on the side of the concentric assembly away from the symmetry center of the two connecting mechanisms, and an arc groove is provided at one end of the rotating drum close to the concentric assembly; a transmission rod extending along its axial direction is provided outside the disk, and the transmission rod cooperates with the arc groove, and when the rotating drum rotates, the disk is driven to move radially through the arc groove; the movable ring is slidably installed on the connecting piece along the axial direction of the fixed tube and is restricted by the connecting piece to rotate; an avoidance groove for accommodating the connecting piece is provided between one end of the ring close to the adapter and the core; the movable ring is spirally matched with the rotating drum, and when the plug assembly is plugged in, the ring part of the plug core pushes the movable ring to move, thereby causing the rotating drum to rotate.

[0009] Optionally, the transmission assembly further comprises an elastic member, which connects the movable ring and the rotating drum, and enables the plurality of disks to remain coaxial in an initial state through the movable ring, the rotating drum and the transmission rod.

[0010] Optionally, the connecting piece includes an outer tube and an inner tube, the outer tube is fitted with and fixedly connected to the inner wall of the fixed tube; the end of the outer tube close to the symmetry center of the two connecting mechanisms is blocked, and a center hole is opened on the end face for the core to pass through and connect with the threading hole; the inner tube is fixed in the outer tube and the end of the inner tube away from the symmetry center of the two connecting mechanisms extends to the outside of the outer tube; the concentric assembly is arranged in the outer tube; the rotating tube and the movable ring are installed outside the inner tube.

[0011] Optionally, the mutually adjacent end faces of the outer tubes of the two connecting mechanisms and the inner wall of the fixed tube define a connecting chamber, and the cores of the two plug assemblies are connected in the connecting chamber; the optical fiber switching adapter also includes a piston assembly, the piston assembly includes a piston cylinder and a piston cap, the piston cylinder passes through an adapter and is fixed to the fixed tube, and the interior of the piston cylinder is connected to the connecting chamber; the piston cap is threadedly matched with the piston cylinder, and a piston block is connected to the piston cap and is slidably sealed with the inner wall of the piston cylinder, and the piston cap rotates to move the piston block along the inner wall of the piston cylinder, thereby sucking the connecting chamber to a negative pressure state.

[0012] Optionally, the airbag is wavy in the circumferential direction of the threading hole.

[0013] Optionally, the adapter is a split structure, consisting of two symmetrically arranged and detachably connected adapter shells.

[0014] Optionally, a clamping rod is provided in each adapter shell, which is inclined relative to the axial direction of the fixed tube, and has two ends in the axial direction of the fixed tube, respectively, a first end and a second end, the first end is an end close to the symmetry center of the two adapter shells, and is fixed to the adapter shell, and the second end is provided with a barb; the second end is farther away from the inner wall of the adapter shell than the first end; a gap is reserved between the outer shell and the plug core of the plug assembly, and the inner wall of the outer shell is provided with a slide groove for guiding the entry of the clamping rod, and a clamping groove for cooperating with the barb, the slide groove is parallel to the axis of the fixed tube, the clamping groove is located on the side of the slide groove away from the adapter, and is separated from the slide groove by a block fixed to the outer shell.

[0015] The beneficial effects of the present invention are as follows: the concentric assembly of the optical fiber switching device of the present invention blocks the threading hole before the plug assembly is plugged in to prevent dust from entering, and the threading hole opens when the ferrule of the plug assembly enters the fixing tube to allow the ferrule to pass through and complete the connection, and when the ferrule is moved into place, the ferrule is limited and fixed by utilizing the mutual misalignment of multiple threading holes, and the ferrule is kept coaxial with the fixing tube, thereby ensuring that the ferrules of the two plug assemblies can be connected in a concentric state, avoiding insufficient docking of the two ferrules to affect signal transmission, thereby reducing optical loss at the connection.

[0016] Furthermore, when the piston assembly sucks the connection chamber to a negative pressure state after the two plug assemblies are connected, the airbag in the inner circle of the threading hole tends to deform toward the connection chamber, which can drive the core part that fits it to move toward the connection chamber, thereby pre-tightening the connection between the two core parts. The negative pressure effect of the connection chamber increases the resistance when the two plug assemblies move away from each other, preventing the plug assemblies from being disconnected due to accidental touch.

[0017] Furthermore, an inclined clamping rod is provided in the adapter shell. When the hook at its end passes over the clamping block and cooperates with the clamping groove, the clamping rod restores its own deformation to make the hook abut against the clamping block, and the clamping rod has a tendency to retract inward, further preventing the outer shell of the plug assembly from separating from the adapter shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of an optical fiber switching device of the present invention;

[0020] Figure 2 A side view of the overall structure of an embodiment of an optical fiber switching device of the present invention;

[0021] Figure 3 for Figure 2 Schematic diagram of the section along the AA direction;

[0022] Figure 4 for Figure 3 The enlarged schematic diagram of the X in the middle;

[0023] Figure 5 A schematic diagram of the overall structure of an optical fiber switching device according to an embodiment of the present invention;

[0024] Figure 6 It is a schematic diagram of the split cutaway view of the adapter and the plug assembly in an embodiment of an optical fiber switching device of the present invention;

[0025] Figure 7 It is a disassembled schematic diagram of a fixed tube, a connecting mechanism and a piston assembly in an embodiment of an optical fiber switching device of the present invention;

[0026] Figure 8 It is a schematic diagram of the disassembly of the concentric components in an embodiment of an optical fiber switching device of the present invention;

[0027] Fig. 9 It is a schematic diagram of the blocking state of the concentric components in an embodiment of an optical fiber switching device of the present invention;

[0028] Fig.10 It is a schematic diagram of the locking state of the concentric components in an embodiment of an optical fiber switching device of the present invention;

[0029] Fig.11 It is a schematic structural diagram of a connector in an embodiment of an optical fiber switching device of the present invention.

[0030] In the figure: 100, adapter; 110, adapter shell; 111, clamping rod; 112, barb; 200, plug assembly; 210, shell; 211, clamping block; 220, plug core; 221, core; 222, ring; 300, piston assembly; 310, piston cylinder; 320, piston cap; 400, fixing tube; 500, connector; 510, outer cylinder; 511, center hole; 51 2. Track; 520. Inner cylinder; 521. Annular groove; 522. Matching groove; 600. Concentric assembly; 610. Disc; 611. Threading hole; 612. Air bag; 613. Transmission rod; 614. Slider; 620. First disc; 630. Second disc; 640. Third disc; 700. Transmission assembly; 710. Rotating cylinder; 711. Arc groove; 720. Movable ring; 730. Elastic member. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] An embodiment of an optical fiber switching device of the present invention is used to connect two plug assemblies 200, such as Figures 1 to 11 As shown, it includes an adapter 100 and a connecting mechanism.

[0033] The adapter 100 is located between the two plug assemblies 200 , and a fixing tube 400 is fixedly arranged inside the adapter 100 ; the plug assembly 200 includes a shell 210 and a plug core 220 fixed inside the shell 210 , and the plug cores 220 of the two plug assemblies 200 are connected inside the fixing tube 400 along the axial direction thereof.

[0034] The connecting mechanisms are arranged in pairs and symmetrically in the fixed tube 400, and each connecting mechanism corresponds to a plug assembly 200. The connecting mechanism includes a connecting member 500, a concentric assembly 600 and a transmission assembly 700; the connecting member 500 is fixed in the fixed tube 400; the concentric assembly 600 includes at least three discs 610 that are sequentially arranged along the axial direction of the fixed tube 400, and each disc 610 is provided with a threading hole 611; the axis of the disc 610 is parallel to the axis of the fixed tube 400, and each disc 610 is slidably installed on the connecting member 500 along its radial direction, and the sliding paths of at least three discs 610 are radially distributed with the axis of the fixed tube 400 as the center. The concentric assembly 600 has a blocking state and a locking state; in the blocking state, at least three disks 610 of the concentric assembly 600 are coaxial with the fixed tube 400, and the threading holes 611 on each disk 610 are not connected to each other; in the locking state, at least three disks 610 of the concentric assembly 600 are not coaxial, and multiple threading holes 611 partially overlap, and the overlapping part corresponds to the size of the plug core 220. The disk 610 moves from a position coaxial with the fixed tube 400 to a direction away from the axis of the fixed tube 400, so that the concentric assembly 600 switches from the blocking state to the locking state. During the movement of the disk 610, the overlapping part of the multiple threading holes 611 increases first and then decreases. In the initial state, the concentric assembly 600 is in the blocking state; when the plug core 220 of the plug assembly 200 moves into the fixed tube 400, the transmission assembly 700 pushes the disk 610 to move, so that the concentric assembly 600 switches to the locking state.

[0035] Before the two plug assemblies 200 are plugged in, the concentric assembly 600 is in a blocked state to prevent dust from entering the position between the two connecting mechanisms for connecting the two plug cores 220; when the plug core 220 of the plug assembly 200 moves into the fixed tube 400, during the process of the transmission assembly 700 pushing the disc 610 to move, the overlapping part of the threading holes 611 of the multiple discs 610 first increases and then decreases. By reasonably configuring the transmission ratio of the transmission assembly 700, the plug core 220 can pass through the threading holes 611 during the process of the overlapping part of the multiple threading holes 611 increasing. When the plug core 220 moves to a position where it can be connected to the plug core 220 of another plug assembly 200, the concentric assembly 600 is in a locked state, and the multiple threading holes 611 limit and fix the position of the plug core 220. Since there are at least three disks 610 , the disks 610 move away from each other and the overlap of the threading holes 611 is reduced. The threading holes 611 are used to position the ferrule 220 so that the ferrule 220 is coaxial with the fixing tube 400 .

[0036] The concentric component 600 blocks the threading hole 611 before the plug component 200 is plugged in to prevent dust from entering, and the threading hole 611 opens when the ferrule 220 of the plug component 200 enters the fixed tube 400, allowing the ferrule 220 to pass through to complete the connection, and when the ferrule 220 moves into place, the ferrule 220 is limited and fixed by the mutual offset of multiple threading holes 611, and the ferrule 220 is kept coaxial with the fixed tube 400, thereby ensuring that the ferrules 220 of the two plug assemblies 200 can be connected in a concentric state, avoiding insufficient docking of the two ferrules 220 affecting signal transmission.

[0037] In this embodiment, an airbag 612 is provided on the inner wall of each threading hole 611, and the airbag 612 is used to contact the ferrule 220. Preferably, the airbag 612 is wavy in the circumferential direction of the threading hole 611. The airbag 612 can form a buffer between the threading hole 611 and the ferrule 220 to prevent the side wall of the threading hole 611 from causing wear to the ferrule 220; and the airbag 612 can fill the gap between the overlapping parts of the plurality of threading holes 611 and the ferrule 220 when the concentric assembly 600 is in a locked state, to prevent dust from entering the connection part of the two ferrules 220 from the threading hole 611.

[0038] In this embodiment, the insert 220 includes a core 221 and a ring 222, wherein the ring 222 is fixed to the outside of the core 221, and one end of the core 221 close to the adapter 100 protrudes from the ring 222. The core 221 is used to pass through the threading hole 611 to connect with the core 221 of another plug assembly 200, and the ring 222 is used to push the disc 610 to move through the transmission assembly 700. The connection method of the cores 221 of the two plug assemblies 200 can be docking or plugging.

[0039] In this embodiment, the transmission assembly 700 includes a rotating drum 710 and a movable ring 720; the rotating drum 710 is coaxial with the distribution center of at least three disks 610. The rotating drum 710 is rotatably mounted on the connecting member 500, and is restricted by the connecting member 500 to move axially along the fixed tube 400; the rotating drum 710 is located on the side of the concentric assembly 600 away from the symmetric center of the two connecting mechanisms, and an arc groove 711 is provided at one end of the rotating drum 710 close to the concentric assembly 600. A transmission rod 613 extending along the axial direction of the disk 610 is provided outside the disk 610, and the transmission rod 613 cooperates with the arc groove 711. When the rotating drum 710 rotates, the disk 610 is driven to move radially through the arc groove 711; specifically, the distances between the two ends of the arc groove 711 in the circumferential direction of the rotating drum 710 and the rotation axis of the rotating drum 710 are different, so that the disk 610 can move radially along its distribution center when the rotating drum 710 rotates. The movable ring 720 is slidably installed on the connector 500 along the axial direction of the fixed tube 400, and is restricted from rotating by the connector 500; an escape groove for accommodating the connector 500 is provided between the end of the ring portion 222 close to the adapter 100 and the core portion 221; the movable ring 720 is spirally matched with the rotating drum 710, and when the plug assembly 200 is plugged in, the ring portion 222 of the plug core 220 pushes the movable ring 720 to move, thereby rotating the rotating drum 710. By configuring the inclination of the arc groove 711 and / or the spiral angle between the movable ring 720 and the rotating drum 710, the transmission ratio of the transmission assembly 700 can be adjusted, thereby ensuring that when the core portions 221 of the two plug cores 220 are connected, the multiple disks 610 move to their threading holes 611 to clamp and lock the core portions 221.

[0040] In this embodiment, the transmission assembly 700 further includes an elastic member 730 , which connects the movable ring 720 and the rotating drum 710 , and enables the plurality of disks 610 to remain coaxial in an initial state through the movable ring 720 , the rotating drum 710 and the transmission rod 613 .

[0041] In this embodiment, the connector 500 includes an outer tube 510 and an inner tube 520. The outer tube 510 is fitted with and fixedly connected to the inner wall of the fixed tube 400. The outer tube 510 is blocked at one end close to the symmetric center of the two connecting mechanisms, and a center hole 511 is provided on the end surface for the core 221 to pass through and communicate with the threading hole 611. The inner tube 520 is fixed in the outer tube 510, and the end of the inner tube 520 away from the symmetric center of the two connecting mechanisms extends to the outside of the outer tube 510. The inner tube 520 is coaxial with the fixed tube 400. The concentric assembly 600 is arranged in the outer cylinder 510, and the disc 610 closest to the end face of the outer cylinder 510 is in contact with the end face of the outer cylinder 510; specifically, the inner ring of the outer cylinder 510 is provided with a plurality of tracks 512 extending radially along the fixed tube 400, and the plurality of tracks 512 are radially distributed with the axis of the fixed tube 400 as the center, and a slider 614 is provided outside each disc 610, and each disc 610 is slidably installed on a track 512 through the slider 614, and the inner cylinder 520 and the outer cylinder 510 can be fixedly connected through the track 512. The rotating drum 710 and the movable ring 720 are installed outside the inner drum 520 and are both coaxial with the inner drum 520; specifically, the inner drum 520 is provided with an annular groove 521 coaxial with the inner drum 520, and the rotating drum 710 is rotatably installed in the annular groove 521; and the inner drum 520 is provided with a matching groove 522 extending along the axial direction of the inner drum 520, and the movable ring 720 is slidably installed in the matching groove 522.

[0042] In this embodiment, there are three groups of disks 610, namely, a first disk 620, a second disk 630 and a third disk 640, wherein the first disk 620 and the second disk 630 are both disk-shaped structures with two layers of spacing, the second disk 630 is located between the two layers of disk-shaped structures of the first disk 620, the third disk 640 is located between the two layers of disk-shaped structures of the second disk 630, and the threading holes 611 on the two layers of disk-shaped structures of the first disk 620 correspond in position, and the threading holes 611 on the two layers of disk-shaped structures of the second disk 630 correspond in position. The threading holes 611 on the three groups of disks 610 are evenly distributed in the circumferential direction around the axis of the fixed tube 400.

[0043] In this embodiment, the end faces of the outer tubes 510 of the two connection mechanisms close to each other and the inner wall of the fixed tube 400 define a connection chamber, and the cores 221 of the two plug assemblies 200 are connected in the connection chamber. The optical fiber switching switching device also includes a piston assembly 300, which includes a piston cylinder 310 and a piston cap 320. The piston cylinder 310 passes through the adapter 100 and is fixed to the fixed tube 400, and the interior of the piston cylinder 310 is connected to the connection chamber; the piston cap 320 is threadedly matched with the piston cylinder 310, and a piston block (not shown in the figure) that is slidably sealed with the inner wall of the piston cylinder 310 is connected to the piston cap 320. The piston cap 320 rotates to move the piston block along the inner wall of the piston cylinder 310, thereby sucking the connection chamber to a negative pressure state. When the connection chamber is sucked to a negative pressure state, the airbag 612 in the inner circle of the threading hole 611 tends to deform toward the connection chamber, which can drive the core 221 in contact with it to move toward the connection chamber, thereby pre-tightening the connection between the two cores 221. The negative pressure effect of the connection chamber increases the resistance when the two plug assemblies 200 move away from each other, preventing the plug assemblies 200 from being disconnected due to accidental touch.

[0044] In this embodiment, the adapter 100 is a split structure, consisting of two symmetrically arranged and detachably connected adapter shells 110, so as to facilitate the installation of the fixing tube 400 and the connecting mechanism inside it.

[0045] In this embodiment, a clamping rod 111 is provided in each adapter shell 110, and the clamping rod 111 is axially inclined relative to the fixed tube 400, and the two ends in the axial direction of the fixed tube 400 are respectively a first end and a second end, the first end is an end close to the symmetry center of the two adapter shells 110, and is fixed to the adapter shell 110, and the second end is provided with a barb 112; the second end is farther away from the inner wall of the adapter shell 110 relative to the first end; a gap is reserved between the outer shell 210 and the plug core 220 of the plug assembly 200, and the inner wall of the outer shell 210 is provided with a slide groove for guiding the clamping rod 111 to enter, and a clamping groove for cooperating with the barb 112, the slide groove is parallel to the axis of the fixed tube 400, the clamping groove is located on the side of the slide groove away from the adapter 100, and is separated from the slide groove by a clamping block 211 fixed to the outer shell 210. There are multiple clamping rods 111 arranged around the circumference of the adapter shell 110, and there are multiple corresponding slide grooves, clamping grooves and clamping blocks 211 arranged on the shell 210. When the plug assembly 200 is close to the adapter 100, the shell 210 is inserted into the adapter shell 110, and the clamping rod 111 is plugged into the slide groove, and the slide groove causes the inclined clamping rod 111 to deform, until the barb 112 on the clamping rod 111 passes over the clamping block 211 and cooperates with the slot, and the connection between the plug assembly 200 and the adapter 100 is completed. The clamping rod 111 restores its own deformation so that the barb 112 abuts against the clamping block 211, and the multiple clamping rods 111 have a tendency to retract inward, preventing the shell 210 of the plug assembly 200 from being separated from the adapter shell 110.

[0046] When using the optical fiber switching device of the present invention, the adapter 100 can be fixed, and the two plug assemblies 200 can be simultaneously approached to the adapter 100 to complete the connection in the fixed tube 400, or the adapter 100 can be fixed by one hand, and the two plug assemblies 200 can be plugged in turn by the other hand. In the initial state, the concentric assembly 600 is in a blocked state, and the multiple disks 610 of the concentric assembly 600 are all coaxial with the fixed tube 400, and the threading holes 611 on the multiple disks 610 are not connected to each other, so that the connection chamber is in a closed state to prevent dust from entering. When the plug assembly 200 is plugged into the adapter 100, the clamping rod 111 in the adapter shell 110 cooperates with the sliding groove on the outer shell 210, and the core 221 of the plug core 220 passes through the inner cylinder 520, and the ring portion 222 of the plug core 220 abuts against the movable ring 720 and pushes the movable ring 720 to move axially along the inner cylinder 520. The rotating cylinder 710 rotates under the spiral cooperation with the movable ring 720, and then the transmission rod 613 cooperates with the arc groove 711 to make the multiple disks 610 move away from each other synchronously along the track 512, so that the threading holes 611 on the multiple disks 610 overlap, and the core 221 of the plug core 220 passes through the multiple threading holes 611 after the multiple threading holes 611 partially overlap. As the ferrule 220 moves, the overlapped portion of the threading holes 611 of the plurality of disks 610 increases first and then decreases, and in the process of the overlapped portion of the plurality of threading holes 611 decreasing, the plurality of threading holes 611 adjust the position of the core 221 of the ferrule 220 through the airbags 612 in the inner circle thereof to make it coaxial with the fixed tube 400. When the ferrule 220 moves to a position where it can be connected with the ferrule 220 of another plug assembly 200, the concentric assembly 600 is in a locked state, and the airbags 612 in the inner circle of the plurality of threading holes 611 limit and fix the position of the ferrule 220. When the core 221 of the ferrule 220 moves to a position, the barb 112 of the clamping rod 111 in the adapter shell 110 cooperates with the clamping groove and abuts against the clamping block 211, preventing the outer shell 210 of the plug assembly 200 from being separated from the adapter shell 110. After the two plug assemblies 200 are plugged in, the piston cap 320 is rotated to move the piston block along the inner wall of the piston cylinder 310, and the connection chamber is sucked to a negative pressure state, so that the airbag 612 of the inner circle of the threading hole 611 tends to deform toward the connection chamber, thereby driving the core 221 that fits it to move toward the connection chamber, and pre-tightening the connection between the two cores 221. The negative pressure effect of the connection chamber increases the resistance when the two plug assemblies 200 move away from each other, preventing the plug assemblies 200 from being disconnected due to accidental touch.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical fiber switching device for connecting two plug assemblies, characterized in that: including an adapter and a connecting mechanism; The adapter is located between the two plug assemblies, and a fixed tube is fixedly arranged in the adapter; the plug assembly includes a shell and a plug core fixed in the shell, and the two plug assembly plug cores are connected in the fixed tube along the axial direction of the fixed tube; The connecting mechanisms are arranged in pairs and symmetrically in the fixed tube, and each connecting mechanism corresponds to a plug assembly; the connecting mechanism includes a connecting piece, a concentric assembly and a transmission assembly; the connecting piece is fixed in the fixed tube; the concentric assembly includes at least three discs that are sequentially arranged along the axial direction of the fixed tube, and each disc is provided with a threading hole; the axis of the disc is parallel to the axis of the fixed tube, and each disc is slidably installed on the connecting piece along its radial direction, and the sliding paths of at least three discs are radially distributed with the axis of the fixed tube as the center; the concentric assembly has a blocking state and a locking state; in the blocking state, at least three of the concentric assembly The discs are all coaxial with the fixed tube, and the threading holes on each disc are not connected to each other; in the locked state, at least three discs of the concentric assembly are not coaxial, and a plurality of threading holes partially overlap, and the overlapping portion corresponds to the size of the plug core; the disc moves from a position coaxial with the fixed tube to a direction away from the axis of the fixed tube, so that the concentric assembly switches from a blocked state to a locked state, and during the movement of the disc, the overlapping portion of the plurality of threading holes first increases and then decreases; in the initial state, the concentric assembly is in a blocked state; when the plug core of the plug assembly moves into the fixed tube, the disc is pushed to move by the transmission assembly, so that the concentric assembly switches to a locked state.

2. The optical fiber switching device according to claim 1, characterized in that: An air bag is arranged on the inner wall of each threading hole, and the air bag is used for contacting with the insert core.

3. The optical fiber switching device according to claim 2, characterized in that: The insert includes a core and a ring. The ring is fixed on the outside of the core, and one end of the core close to the adapter protrudes compared to the ring. The core is used to pass through the threading hole and contact the core of another plug assembly, and the ring is used to push the disc to move through the transmission assembly.

4. The optical fiber switching device according to claim 3, characterized in that: The transmission assembly includes a rotating drum and a movable ring; the rotating drum is coaxial with the distribution center of at least three disks; the rotating drum is rotatably installed on the connecting piece and is restricted by the connecting piece to move axially along the fixed tube; the rotating drum is located on the side of the concentric assembly away from the symmetry center of the two connecting mechanisms, and an arc groove is provided at one end of the rotating drum close to the concentric assembly; a transmission rod extending along its axial direction is provided outside the disk, and the transmission rod cooperates with the arc groove, and when the rotating drum rotates, the disk is driven to move radially through the arc groove; the movable ring is slidably installed on the connecting piece along the axial direction of the fixed tube and is restricted by the connecting piece to rotate; an avoidance groove for accommodating the connecting piece is provided between the end of the ring part close to the adapter and the core part; the movable ring is spirally matched with the rotating drum, and when the plug assembly is plugged in, the ring part of the plug core pushes the movable ring to move, thereby rotating the rotating drum.

5. The optical fiber switching device according to claim 4, characterized in that: The transmission assembly also includes an elastic member, which connects the movable ring and the rotating cylinder, and enables the multiple disks to remain coaxial in an initial state through the movable ring, the rotating cylinder and the transmission rod.

6. The optical fiber switching device according to claim 4, characterized in that: The connecting piece includes an outer tube and an inner tube. The outer tube is fitted with and fixedly connected to the inner wall of the fixed tube. The end of the outer tube close to the symmetric center of the two connecting mechanisms is blocked, and a center hole is opened on the end surface for the core to pass through and communicate with the threading hole. The inner tube is fixed in the outer tube and the end of the inner tube away from the symmetric center of the two connecting mechanisms extends to the outside of the outer tube. The concentric component is arranged in the outer tube; the rotating tube and the movable ring are installed outside the inner tube.

7. The optical fiber switching device according to claim 6, characterized in that: The end faces of the outer tubes of the two connecting mechanisms that are close to each other and the inner wall of the fixed tube define a connecting chamber, and the cores of the two plug assemblies are connected in the connecting chamber; the optical fiber switching adapter also includes a piston assembly, the piston assembly includes a piston cylinder and a piston cap, the piston cylinder passes through an adapter and is fixed to the fixed tube, and the interior of the piston cylinder is connected to the connecting chamber; the piston cap is threadedly matched with the piston cylinder, and a piston block is connected to the piston cap and is slidably sealed with the inner wall of the piston cylinder. The piston cap rotates to move the piston block along the inner wall of the piston cylinder, thereby sucking the connecting chamber to a negative pressure state.

8. The optical fiber switching device according to claim 2, characterized in that: The airbag is wavy in the circumferential direction of the threading hole.

9. The optical fiber switching device according to claim 1, characterized in that: The adapter is a split structure, consisting of two symmetrically arranged and detachably connected adapter shells.

10. The optical fiber switching device according to claim 9, characterized in that: A clamping rod is provided in each adapter shell. The clamping rod is inclined relative to the axial direction of the fixed tube, and the two ends in the axial direction of the fixed tube are respectively a first end and a second end. The first end is an end close to the symmetry center of the two adapter shells and is fixed to the adapter shell, and the second end is provided with a barb; the second end is farther away from the inner wall of the adapter shell than the first end; a gap is reserved between the outer shell and the plug core of the plug assembly, and the inner wall of the outer shell is provided with a slide groove for guiding the entry of the clamping rod, and a clamping groove for cooperating with the barb, the slide groove is parallel to the axis of the fixed tube, the clamping groove is located on the side of the slide groove away from the adapter, and is separated from the slide groove by a clamping block fixed to the outer shell.

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