Connecting structure for preventing optical cable from falling off

Abstract

The utility model discloses a connection structure for preventing an optical cable from falling off, and belongs to the technical field of communication. Comprising an optical cable, a metal tail handle and a ceramic ferrule, a connecting channel penetrating through the metal tail handle is arranged in the middle of the metal tail handle, the ceramic ferrule is arranged at one end of the connecting channel, the optical cable is inserted from the other end of the connecting channel, and the end, inserted into the optical cable, of the metal tail handle comprises a cylinder part and an occlusion part; one end, inserted into the optical cable, of the metal tail handle is provided with a tightening cylinder, the tightening cylinder comprises a connecting part and a tightening part, the connecting part is in threaded connection with the cylinder part, the tightening part sleeves the occlusion part, and as the cylinder part is screwed into the connecting part, the tightening part gradually tightens the occlusion part to enable the occlusion part to be closed and clench the optical cable; the outer surface of the optical cable is provided with a plurality of trapezoidal grooves. According to the utility model, the trapezoid gap is processed outside the optical cable, and the occlusion structure is combined, so that the problem that the optical cable falls off is fundamentally prevented, and the reliability index of the optical cable is improved.

Description

Technical Field

[0001] The utility model relates to a connection structure, in particular to an optical cable and an insert tail handle connection structure for preventing the optical cable from falling off, belonging to the technical field of communication. Background Art

[0002] Optical cables usually include an optical fiber core and an outer sheath covering the optical fiber core. In the prior art, optical cables are usually used in the field of communications. During use, tail handles are usually set at the head and tail to facilitate connection. The tail handle is composed of a sleeved metal tail handle and a ceramic ferrule. The main function of the ceramic ferrule is to achieve physical docking of optical fibers (also known as optical fiber cold splicing). The metal tail handle is connected to one end of the ceramic ferrule, and then the movable joint is connected through the metal tail handle to facilitate connection with the device. The stripped optical fiber is usually inserted into the space reserved in the central axis of the ceramic ferrule and the metal tail handle, and glue is injected and high-temperature cured. The optical cable and the tail handle are cured together by the adhesion of the glue to achieve the purpose of fixation.

[0003] However, the gap between the outer diameter of the optical cable and the inner hole of the metal handle is small. When the cured 353ND glue is subjected to reliability tests such as high temperature and humidity, TC, and tensile tests, there are two types of undesirable shedding phenomena. One type of shedding is that part of the optical cable will fall out of the cured 353ND glue, and the other type of shedding is that the optical cable and the glue fall out of the hole of the metal tail handle together. In addition, as the use time goes by, or the customer adjusts the process of coupling or welding devices, the optical cable and the ferrule will also fall off due to debonding, affecting the service life.

[0004] The Chinese invention patent application with application number 2014105210754 discloses a tail handle structure of an optical fiber ceramic ferrule tail handle, which is provided with a notch on the optical cable, a convex ridge as a bayonet on the optical cable ceramic ferrule tail handle, and the tail seat and the ceramic ferrule are connected by press-fit interference. On this basis, the glue is poured and cured at high temperature, and the cured glue can form a closed fixed sleeve between the optical cable, the tail seat and the ceramic ferrule while increasing the glue amount. The optical cable indentation is hooked on the cured 353ND glue in the form of a step, and the problem of optical cable falling off is fundamentally prevented when conducting reliability tests such as high temperature and high humidity, TC, and tensile tests, thereby improving the reliability index of the optical cable. However, the convex ridge as a bayonet on the optical cable ceramic ferrule tail handle will reduce the insertion channel of the optical cable, affecting the insertion of the optical cable. In addition, the gap between the optical cable and the inner hole of the tail handle is small, so the height of the convex ridge is limited, and the resistance to the cured glue layer is limited. Moreover, only a simple notch structure is provided on the optical cable, which has limited enhancement on the fixing effect of the optical cable. If the notch structure is provided too much and too densely, the structural strength of the outer sheath of the optical cable will be destroyed, and the outer sheath of the optical cable may be directly torn and the optical fiber core may be directly pulled out of the tail handle, and it is impossible to ensure that the glue is fully filled into the notch. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a connection structure for preventing an optical cable from falling off.

[0006] The technical solution adopted by the utility model is: designing a connection structure to prevent the optical cable from falling off, comprising an optical cable, a metal tail handle and a ceramic ferrule, wherein a connection channel penetrating the metal tail handle is arranged in the middle of the metal tail handle, a ceramic ferrule is arranged at one end of the connection channel, the optical fiber core of the optical cable end is stripped out and inserted into the other end of the connection channel, and the optical fiber core of the optical cable is inserted into the ceramic ferrule. The connecting channel is an equal-diameter circular channel. The end of the metal tail handle inserted into the optical cable includes a cylindrical portion and a bite portion. The bite portion includes bite blades. A plurality of bite blades are arranged in an array around the central axis of the cylindrical portion, and all the bite blades are combined to form the bite portion. The end of the metal tail handle inserted into the optical cable is provided with a tightening cylinder, and the tightening cylinder includes a connecting portion and a tightening portion. The connecting portion is threadedly connected to the cylindrical portion, and the tightening portion is sleeved outside the bite portion. As the cylindrical portion is screwed into the connecting portion, the tightening portion gradually tightens the bite portion to close it and bite the optical cable. The outer surface of the optical cable is provided with a plurality of trapezoidal grooves, and the trapezoidal grooves extend in an arc or spiral shape along the outer surface of the optical cable. Glue is filled and poured between the metal tail handle and the optical cable.

[0007] Furthermore, the bite portion of the present design is a hollow truncated cone-shaped structure, the middle of which is penetrated by a connecting channel, the large end of the bite portion is connected to the cylindrical portion, the outer surface of the cylindrical portion is provided with an external thread, the connecting portion is a round tube with an inner wall provided with a matching internal thread, and a tightening portion is provided at the end of the connecting portion away from the cylindrical portion, and the tightening portion is a ring plate arranged in the connecting portion.

[0008] Furthermore, in the present design, a chamfer or a rounded corner is provided on the inner side of the ring opening of the tightening portion, and dense anti-slip protrusions are provided on the outer surface of the connecting portion.

[0009] Furthermore, the engaging portion of the present design includes at least four engaging blades, gaps are provided between each pair of the engaging blades, and arc transitions are used at the roots of the gaps between each pair of the engaging blades.

[0010] Furthermore, the grooves on the outer surface of the optical cable of the present design are arranged in a spiral shape, and the axial extension distance of the grooves along the optical cable is not greater than the diameter of the optical cable, and the circumferential extension distance of the grooves along the optical cable is not greater than the radius of the optical cable and not less than one quarter of the diameter of the optical cable.

[0011] Furthermore, the groove of the present design includes a first groove and a second groove, and the first groove and the second groove are reverse spiral structures.

[0012] Furthermore, in the present design, the first groove and the second groove are respectively arranged on one half of the arc surface of the outer surface of the optical cable, and are staggered in the axial direction.

[0013] Furthermore, in the present design, the first groove and the second groove are respectively arranged in an array along the axial direction of the optical cable, and at least two of each are arranged.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model not only does not affect the size of the insertion channel of the optical cable, but also enables the optical cable entering the metal tail handle to be directly bitten, and then uses glue to further improve the fixing effect of the optical cable through the design of the threaded structure of the cylindrical part, the biting part and the tightening cylinder. The utility model also processes a plurality of "trapezoidal" notches / grooves on the outside of the optical cable. After the product is treated with high temperature by injection of glue, a mutual force is formed between the fixed glue and the "trapezoidal" notch of the optical cable, and there is also an interaction between the cured glue and the closed biting part, that is, there is a greater mutual blocking effect between the glue and the metal tail handle, which fundamentally prevents the problem of optical cable falling off and improves the reliability index of the optical cable.

[0016] The utility model can effectively prevent part of the optical cable from falling out of the cured 353ND glue, and can also effectively prevent the optical cable and the glue from falling out of the metal tail handle hole. Its connection effect on the optical cable is stable, reliable and long-lasting. Even with the passage of time, or the adjustment of the customer's coupling or welding device process, the optical cable and the ferrule can still have a better connection effect and a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic cross-sectional view of the utility model.

[0019] Figure 2 It is a schematic diagram of the axonometric drawing of the utility model.

[0020] Figure 3 It is a schematic diagram of the metal tail handle of the utility model.

[0021] Figure 4 This is a schematic diagram of the optical cable of the utility model.

[0022] In the figure: 1. optical cable; 2. metal tail handle; 3. ceramic ferrule; 4. optical fiber core; 5. cylindrical part; 6. bite part; 7. bite blade; 8. tightening cylinder; 9. connecting part; 10. tightening part; 11. glue; 12. first groove; 13. second groove. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example 1

[0026] like Figure 1-4 As shown: a connection structure for preventing an optical cable 1 from falling off, comprising an optical cable 1, a metal tail handle 2 and a ceramic ferrule 3, wherein a connection channel penetrating the metal tail handle 2 is arranged in the middle of the metal tail handle 2. A ceramic ferrule 3 is arranged at one end of the connection channel in the middle of the metal tail handle 2, and the ceramic ferrule 3 is inserted into the connection channel, and the two are interference fit; the end of one end of the optical cable 1 (comprising an optical fiber core 4 and an outer sheath or protective layer covering the optical fiber core 4) is stripped of the optical fiber core 4 and then inserted from the other end of the connection channel until the stripped optical fiber core 4 is completely inserted into the ceramic ferrule 3, and at this time, the optical cable 1 is also inserted into the metal tail handle 2, and the above are all prior arts.

[0027] In this embodiment, the connection channel of the metal tail handle 2 is an equal-diameter circular channel. The end of the metal tail handle 2 inserted into the optical cable 1 includes a cylindrical portion 5 and a bite portion 6. The cylindrical portion 5 and the bite portion 6 are integrally formed. The bite portion 6 includes bite blades 7. A plurality of bite blades 7 are arranged in an array around the central axis of the cylindrical portion 5. All the bite blades 7 are combined to form the bite portion 6. The end of the metal tail handle 2 inserted into the optical cable 1 is provided with a tightening cylinder 8. The tightening cylinder 8 includes a connecting portion 9 and a tightening portion 10. The connecting portion 9 and the tightening portion 10 are an integral structure. The connecting portion 9 is threadedly connected to the cylindrical portion 5. The tightening portion 10 is sleeved on the outside of the bite portion 6. As the cylindrical portion 5 is screwed into the connecting portion 9, the bite portion 6 gradually extends out of the tightening portion 10. The tightening portion 10 gradually tightens the bite portion 6 so that all its bite blades 7 are close to each other and bite the optical cable 1.

[0028] With the above structural arrangement, after the optical cable 1 is inserted into the metal tail handle 2, it can be tightened by the bite portion 6, making it difficult for the optical cable 1 to be loosened from the metal tail handle 2, and the structure is stable and reliable.

[0029] In order to ensure that the connection structure between the optical cable 1 and the metal tail handle 2 is reliably connected and does not fall off during long-term use, at least three trapezoidal (isosceles trapezoidal) grooves are provided on the outer surface of the optical cable 1 in this embodiment. The trapezoidal grooves extend in an arc or spiral shape along the outer surface of the optical cable 1, and glue 11 is filled and poured between the metal tail handle 2 and the optical cable 1. First, the metal tail handle 2 and the optical cable 1 are connected by glue 11, which further strengthens the connection structure between the two. Secondly, the connection between the cured glue 11 and the optical cable 1 is more stable through the setting of the grooves. The grooves are set in a trapezoidal structure, which is convenient for the glue 11 to fully fill the grooves. The trapezoidal grooves extend in an arc or spiral shape along the outer surface of the optical cable 1. On the one hand, they lengthen the grooves and deepen the connection between the glue 11 and the optical cable 1. On the other hand, they prevent the grooves from being concentrated at a certain place of the optical cable 1, excessively weakening the structural strength of the outer sheath of the optical cable 1, and preventing the outer sheath of the optical cable 1 from being torn. Finally, this extension method also facilitates the glue 11 to flow in the grooves when it is not solidified, so as to fully fill the grooves.

[0030] In this embodiment, the connection between the glue 11 and the optical cable 1 is strengthened by setting the groove. After the bite portion 6 is closed and bites the optical cable 1, the connection between the glue 11 and the metal tail handle 2 is also strengthened, forming a relatively closed glue 11 filling space, and the cured glue 11 is not easy to fall out of the metal tail handle 2.

[0031] Example 2

[0032] This embodiment is based on the embodiment 1, and proposes a specific metal tail handle 2 bite structure, specifically:

[0033] The engaging portion 6 is a hollow truncated cone structure, i.e., a variable diameter structure, wherein the middle is penetrated by a connecting channel, the large end of the engaging portion 6 is connected to the cylindrical portion 5, the outer surface of the cylindrical portion 5 is provided with an external thread, the connecting portion 9 is a round tube with an inner wall provided with an internal thread matching the external thread on the outer surface of the cylindrical portion 5, and the end of the connecting portion 9 away from the cylindrical portion 5 is provided with a tightening portion 10, which is a ring sheet arranged in the connecting portion 9. When the optical cable 1 needs to be tightened, the connecting portion 9 is rotated to make it continuously penetrate into the cylindrical portion 5, and then the tightening portion 10 advances (climbs) along the engaging portion 6, and the engaging portion 6 continuously extends out of the tightening portion 10 while being continuously clamped and pressed closed by the tightening portion 10 until the optical cable 1 is fully tightened.

[0034] Example 3

[0035] This embodiment is based on the embodiment 2, and further refines the proposed metal tail handle 2 bite structure, specifically:

[0036] The inner side of the ring opening of the tightening part 10 is provided with a chamfer or a rounded corner to facilitate the biting part 6 to extend out of the end of the tightening part 10, and also to facilitate the fast screwing in of the tightening tube 8 to press the biting part 6; the outer surface of the connecting part 9 is provided with dense anti-slip protrusions to facilitate the rotation of the tightening tube 8.

[0037] Example 4

[0038] This embodiment is based on the embodiment 3, and further refines the structure of the bite portion 6, specifically:

[0039] The bite portion 6 includes six bite blades 7, such as Figure 3 As shown, the size of the bite blades 7 is controlled so that the bite blades 7 are easily bent by the tightening tube 8, thereby effectively biting the optical cable 1. Gaps are set between the bite blades 7 to facilitate closing, and the roots of the gaps between the bite blades 7 are arc-shaped to prevent tearing.

[0040] Example 5

[0041] This embodiment is based on the embodiment 4, and further refines the groove structure of the optical cable 1 so that it cooperates with the structure of the metal tail handle 2 to improve the anti-dropping property of the optical cable 1, specifically:

[0042] like Figure 4 As shown: In this embodiment, the groove on the outer surface of the optical cable 1 is arranged in a spiral shape, and the axial extension distance of the groove along the optical cable 1 is not greater than the diameter of the optical cable 1, and the circumferential extension distance of the groove along the optical cable 1 is not greater than the radius of the optical cable 1 and is not less than one quarter of the diameter of the optical cable 1, so that the groove can bring a better glue 11 fixing effect to the optical cable 1 without excessively damaging the outer sheath of the optical cable 1.

[0043] Example 6

[0044] This embodiment further refines the groove structure of the optical cable 1 on the basis of Embodiment 5, specifically:

[0045] The grooves include a first groove 12 and a second groove 13 . The first groove 12 and the second groove 13 are reverse spiral structures, which further improve the fixing effect of the glue 11 .

[0046] In this embodiment, the first groove 12 and the second groove 13 are respectively arranged on one half of the arc surface of the outer surface of the optical cable 1, and are staggered in the axial direction to ensure the structural strength of the outer sheath of the optical cable 1 and reduce stress concentration. The first groove 12 and the second groove 13 are respectively arranged in an array along the axial direction of the optical cable 1, and at least two are respectively arranged to ensure sufficient fixing effect of the glue 11 and improve the adhesion between the glue 11 and the optical cable 1.

[0047] In the present application, the connection channel is located at one end of the ceramic ferrule 3 and is tilted downward at a certain angle (3-8°). The effect of improving the light reflectivity and coupling power is achieved by changing the angle between the center line of the ferrule and the center line of the tail handle body. A trumpet-shaped opening is provided at one end of the ceramic ferrule 3 where the optical fiber core 4 is inserted, so that the optical fiber core is stably inserted into the ceramic ferrule 3, thereby improving the assembly efficiency of the optical fiber tail handle.

[0048] The process steps of the connection structure for preventing the optical cable 1 from falling off disclosed in the present application are as follows:

[0049] a: Punching the outer sheath of the optical cable 1 to form a "trapezoidal" groove / notch structure on the surface of the outer sheath;

[0050] b: When the outer sheath of the optical cable 1 is stripped, at least two "trapezoidal" notches are retained;

[0051] C: After the optical cable 1 is stripped, glue 11 is poured into the metal tail handle 2 (with the ceramic ferrule 3 installed), and then the optical cable 1 is inserted. After the optical cable 1 is inserted into the metal tail handle 2 and the ceramic ferrule 3, it can be pulled back and forth slightly once or twice and rotated one or two circles, and then the tightening cylinder 8 is tightened until the bite part 6 bites the optical cable 1, and the glue 11 is bonded and fixed to the metal tail handle 2 by high temperature;

[0052] d: After being bonded and fixed, a "trapezoidal" structure and a conical structure are formed between the optical cable 1 and the metal tail handle 2, thereby forming an interaction between the glue 11 and the optical cable 1, and between the glue 11 and the metal tail handle 2.

[0053] In addition, in the description of the present invention, unless otherwise specified, the terms "multiple", "multiple roots", "multiple groups" mean two or more than two, and "several", "several roots", "several groups" mean one or more than one. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] The specific implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A connection structure for preventing an optical cable from falling off, comprising an optical cable, a metal tail handle and a ceramic ferrule, wherein a connection channel penetrating the metal tail handle is provided in the middle of the metal tail handle, a ceramic ferrule is provided at one end of the connection channel, and the optical fiber core of the optical cable end is stripped and inserted into the other end of the connection channel, and the optical fiber core of the optical cable is inserted into the ceramic ferrule, characterized in that: The connecting channel is a circular channel with equal diameters. The end of the metal tail handle inserted into the optical cable includes a cylindrical portion and a bite portion. The bite portion includes bite blades. A plurality of bite blades are arranged in an array around the central axis of the cylindrical portion. All bite blades are combined to form the bite portion. The end of the metal tail handle inserted into the optical cable is provided with a tightening cylinder. The tightening cylinder includes a connecting portion and a tightening portion. The connecting portion is threadedly connected to the cylindrical portion. The tightening portion is sleeved outside the bite portion. As the cylindrical portion is screwed into the connecting portion, the tightening portion gradually tightens the bite portion to close it and bite the optical cable. The outer surface of the optical cable is provided with a plurality of trapezoidal grooves, the trapezoidal grooves extend in an arc shape or a spiral shape along the outer surface of the optical cable, and glue is filled and poured between the metal tail handle and the optical cable.

2. The connection structure for preventing the optical cable from falling off according to claim 1, characterized in that: The engaging part is a hollow truncated cone-shaped structure, the middle of which is penetrated by a connecting channel, the large end of the engaging part is connected to the cylindrical part, the outer surface of the cylindrical part is provided with an external thread, the connecting part is a round tube with an inner wall provided with a matching internal thread, and a tightening part is provided at one end of the connecting part away from the cylindrical part, and the tightening part is a ring sheet arranged in the connecting part.

3. The connection structure for preventing the optical cable from falling off according to claim 2, characterized in that: The inner side of the tightening portion ring opening is provided with a chamfered angle or a rounded angle, and the outer surface of the connecting portion is provided with dense anti-slip protrusions.

4. The connection structure for preventing the optical cable from falling off according to claim 3, characterized in that: The engaging portion comprises at least four engaging blades, gaps are arranged between the engaging blades, and the roots of the gaps between the engaging blades are formed in a circular arc transition.

5. The connection structure for preventing the optical cable from falling off according to any one of claims 1 to 4, characterized in that: The groove on the outer surface of the optical cable is arranged in a spiral shape, and the axial extension distance of the groove along the optical cable is not greater than the diameter of the optical cable, and the circumferential extension distance of the groove along the optical cable is not greater than the radius of the optical cable and not less than one quarter of the diameter of the optical cable.

6. The connection structure for preventing the optical cable from falling off according to claim 5, characterized in that: The groove comprises a first groove and a second groove, and the first groove and the second groove are reverse spiral structures.

7. The connection structure for preventing the optical cable from falling off according to claim 6, characterized in that: The first groove and the second groove are respectively arranged on one half of the arc surface of the outer surface of the optical cable and are staggered in the axial direction.

8. The connection structure for preventing the optical cable from falling off according to claim 7, characterized in that: The first grooves and the second grooves are respectively arranged in an array along the axial direction of the optical cable, and at least two of each groove are arranged.

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