Ultrasonic welding sheath optical cable

Abstract

The utility model discloses an ultrasonic welding sheath optical cable, which belongs to the technical field of optical fiber cables, solves the problem that an optical cable sheath is inconvenient to open when the optical cable sheath is opened and stripped in the prior art, and comprises at least two prefabricated sheath strips, each prefabricated sheath strip is provided with a first end part and a second end part which are located at the two opposite ends of the prefabricated sheath strip, the first end part of each prefabricated sheath strip and the second end part of the adjacent prefabricated sheath strip are sequentially connected to form an annular sheath, and a polypropylene material layer is connected between every two adjacent prefabricated sheath strips; a central reinforcing piece is arranged in the annular sheath, and an optical fiber assembly is arranged in the central reinforcing piece; the adjacent prefabricated sheath strips are subjected to ultrasonic welding, and the polypropylene material layer is used for controlling the interface strength of ultrasonic welding. According to the utility model, the outer sheath is used for the optical fiber cable, the thickness of the sheath is uniform through the prefabricated sheath strip and the polypropylene material layer, and the sheath is convenient to strip.

Description

TECHNICAL FIELD

[0001] The utility model belongs to optical fiber cable technical field, concretely relates to an ultrasonic wave fusion sheath optical cable. BACKGROUND

[0002] Generally, the optical cable sheath production line is horizontally placed, and the plastic is in a molten state due to high temperature when it is discharged from the die. The molten plastic is affected by gravity, and the sheath below the cable core is thick, and the sheath above the cable core is thin. This causes the sheath to be eccentric, and the sheath is thin, which weakens the protection of the optical cable.

[0003] Since the extruder extrudes a molten sheath, the speed of the cable core affects the thickness of the sheath. In particular, when the production line is stopped due to a fault, the sheath is discontinuous, the material is removed, or the sheath is blocked. At this time, the optical cable is either cut off, resulting in a non-standard length, or the cable core with and without the sheath is directly and continuously collected on the disc, and then the sheath of the part with the extruded sheath is removed, and then the cable core is sheathed again. These two methods will cause losses because it is difficult to achieve uniform speed, uniform speed, and stop production at any time.

[0004] The sheath extruded by the extruder is relatively uniform in strength on the circumference. After cooling, the sheath has high strength. When the sheath is opened and peeled off, a blade is needed to cut the sheath vertically or horizontally to facilitate the removal of the sheath, but it is easy to cut the internal optical cable. Alternatively, a high-strength tear rope is placed under the sheath to cut the sheath. However, the tear rope has a high cost, and the operation is not convenient. SUMMARY

[0005] The purpose of the utility model is to:

[0006] To solve the problem of uneven thickness of the sheath of the optical cable in the prior art due to the influence of gravity and downtime during production, and the inconvenience of peeling off the sheath of the optical cable, an ultrasonic wave fusion sheath optical cable is provided.

[0007] The technical solution adopted by the utility model is as follows:

[0008] An ultrasonic wave fusion sheath optical cable includes at least two pre-sheath strips, a first end portion and a second end portion are arranged on each pre-sheath strip, the first end portion of each pre-sheath strip is connected to the second end portion of an adjacent pre-sheath strip to form a ring-shaped sheath, and a polypropylene material layer is connected between each pair of adjacent pre-sheath strips.

[0009] The adjacent pre-sheath strips are ultrasonically welded, and the polypropylene material layer is used to control the interface strength of the ultrasonic welding to a level at which the adjacent pre-sheath strips can be torn apart.

[0010] The annular sheath is internally provided with a center reinforcing member, and the center reinforcing member is internally provided with a fiber assembly.

[0011] Further, the center reinforcing member is internally further provided with a sleeve, and a longitudinal groove is arranged on the inner surface of the center reinforcing member.

[0012] The longitudinal groove is arranged in a spiral shape around the central axis of the center reinforcing member, and the sleeve is spirally twisted and connected with the center reinforcing member.

[0013] Further, the pitch of the longitudinal groove is arranged to be the same as the spiral twisting pitch of the sleeve, and the diameter of the longitudinal groove is greater than the diameter of the sleeve by 0.1mm-0.5mm.

[0014] Further, two preformed sheath strips are arranged around the center reinforcing member, and each preformed sheath strip is uniformly arranged in a semicircular shape on the outer surface of the center reinforcing member.

[0015] Further, four preformed sheath strips are arranged around the center reinforcing member, and each preformed sheath strip is uniformly arranged in a quarter circular shape on the outer surface of the center reinforcing member.

[0016] In summary, due to the adoption of the above technical scheme, the beneficial effects of the present application are:

[0017] 1. The present application solves the problem of uneven thickness of the existing optical cable sheath. By using the preformed sheath strip, only the contact interface of the adjacent preformed sheath strip will heat up during ultrasonic welding, and the other parts will have low temperature and will not be affected by gravity to cause uneven thickness, so that the thickness of the preformed sheath strip will not be affected whether the production line speed is fast or slow.

[0018] 2. The ultrasonic welding sheath optical cable of the present application can be stopped at any time when problems occur during production, and the production can continue after the problems are solved, without causing problems such as sheath blockage and material stripping, avoiding the need for re-winding, peeling and maintenance, saving time and manpower, and ensuring production efficiency.

[0019] 3. The present application puts a layer of polypropylene material between the ultrasonic welding interface of adjacent preformed sheath strips, thereby controlling the strength of the welding interface, achieving a sheath that can meet the strength requirements and also realize the function of tearing open the sheath with hands for separation, greatly facilitating the peeling operation of the sheath and improving the speed of installing the optical cable. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a cross-sectional view of the ultrasonic welding sheath optical cable of one embodiment of the present application;

[0021] Figure 2The utility model discloses a kind of ultrasonic welding sheath optical cable cross section schematic diagram of one of the embodiments of the utility model;

[0022] Figure 3 The utility model discloses the structure schematic diagram of prefabricated sheath strip;

[0023] Marked in the drawing:1-prefabricated sheath strip, 11-first end, 12-second end, 2-polypropylene material layer, 3-central reinforcing member, 31-longitudinal groove, 4-optical fiber assembly, 5-sleeve. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is further detailed with examples.The specific embodiments described herein are intended to explain the utility model only and are not intended to limit the utility model.

[0025] An ultrasonic welding sheath optical cable, as shown in Figures 1-3 It includes at least two prefabricated sheath strips 1, the first end 11 and the second end 12 located at the opposite ends of the prefabricated sheath strip 1 are arranged on the prefabricated sheath strip 1, the first end 11 of the prefabricated sheath strip 1 and the second end 12 of the adjacent prefabricated sheath strip 1 are sequentially connected to form an annular sheath, and the polypropylene material layer 2 is connected between the adjacent prefabricated sheath strips 1; wherein the adjacent prefabricated sheath strips 1 are ultrasonically welded, and the polypropylene material layer 2 is used to control the interface strength of the ultrasonic welding to the adjacent prefabricated sheath strips 1 that can be torn open; wherein the annular sheath is internally provided with a central reinforcing member 3, and the central reinforcing member 3 is internally provided with an optical fiber assembly 4.

[0026] The utility model discloses prefabricated sheath strip in large scale, using ultrasonic welding technology, sheath strip is welded outside cable core, only the contact interface of adjacent prefabricated sheath strip 1 will heat when ultrasonic welding, other part temperature is low, will not be affected by gravity and cause uneven thickness, so no matter production line speed is fast or slow, will not affect the thickness of prefabricated sheath strip 1, solve the problem of uneven thickness of optical cable sheath.

[0027] The optical cable is provided with the polypropylene material layer 2 (for example, a polypropylene strip) at the ultrasonic welding interface of the adjacent prefabricated sheath strips 1, so as to control the strength of the welding interface, realize the sheath that can meet the strength requirement, and realize the function of tearing open the sheath by hand to separate, greatly facilitate the stripping operation of the sheath, and improve the speed of installing the optical cable. Through the arrangement of the above structure, the optical cable of the utility model can be stopped at any time when problems are encountered in production, and the production can be continued after the problems are solved, so that the problems such as sheath block, material stripping and the like are avoided, re-winding, peeling and maintenance are avoided, time and manpower are saved, and production efficiency is ensured.

[0028] Based on the above implementation scheme, the optical cable production process of this utility model may include the following steps:

[0029] (1) Pre-produce two or more prefabricated sheath strips 1 that meet the required thickness (e.g.) Figure 3 (as shown in the protective strip);

[0030] (2) At the junction of the ultrasonic welding prefabricated sheath strip 1, a polypropylene strip is placed to control the strength of the welding interface.

[0031] (3) The prefabricated sheath strips 1, which are ultrasonically welded in sequence, are welded end to end to form a ring, which serves as the sheath of the optical cable.

[0032] Preferably, a sleeve 5 is further provided inside the central reinforcement 3, and a longitudinal groove 31 is provided on the inner surface of the central reinforcement 3; wherein, the longitudinal groove 31 is spirally arranged around the central axis of the central reinforcement 3, and the sleeve 5 is spirally connected to the central reinforcement 3. The pitch of the longitudinal groove 31 is set to be the same as the spiral twisting pitch of the sleeve 5, and the diameter of the longitudinal groove 31 is 0.1mm-0.5mm larger than the diameter of the sleeve 5.

[0033] In a preferred embodiment, the diameter of the longitudinal groove 31 can be set to be 0.1 mm, 0.2 mm, 0.4 mm, or 0.5 mm larger than the diameter of the sleeve 5. This will be illustrated below with examples:

[0034] Example 1

[0035] In this embodiment, the diameter of the longitudinal groove 31 is set to be 0.2 mm larger than the diameter of the sleeve 5. The grooves are distributed longitudinally around the central reinforcement 3 with a stable pitch spiral rotation. The pitch of the grooves and the spiral twisting pitch of the sleeve 5 are set to be the same. In the cabling process, the sleeve 5 and the central reinforcement 3 are spirally twisted together with a certain pitch to form the core of the optical cable. Then, a sheath is added to this core to form a stranded optical cable. Compared with the existing stranded optical cable using a circular central reinforcement 3, the sleeve 5 and the central reinforcement 3 in this embodiment have a significantly increased contact area due to the groove fit. This ensures a tight bond between the two even at low temperatures, preventing slippage, reducing the shrinkage of the sleeve 5, increasing the bending radius of the optical fiber at low temperatures, and improving the low-temperature performance of the optical cable.

[0036] Example 2

[0037] As a preferred implementation method, such as Figure 1 As shown, in this embodiment, two prefabricated sheath strips 1 are arranged around the central reinforcement member 3. Each prefabricated sheath strip 1 is arranged in a semi-circular shape to uniformly cover the outer surface of the central reinforcement member 3. That is, the bending angle of each prefabricated sheath strip 1 is 180°, and a ring-shaped sheath is formed by the two semi-circles.

[0038] Example 3

[0039] As a preferred implementation method, such as Figure 2 As shown, in this embodiment, four prefabricated sheath strips 1 are arranged around the central reinforcement member 3. Each prefabricated sheath strip 1 is uniformly wrapped around the outer surface of the central reinforcement member 3 in a quarter circle. That is, the bending angle of each prefabricated sheath strip 1 is 90°, and a ring-shaped sheath is formed by the four quarter circles.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ultrasonically fusion spliced jacketed optical cable characterized by, The application relates to a preformed sheath ring, which comprises at least two preformed sheath strips, wherein first and second ends of the preformed sheath strips are arranged at opposite ends of the preformed sheath strips, the first end of the preformed sheath strip is connected with the second end of an adjacent preformed sheath strip to form a ring-shaped sheath, and a polypropylene material layer is arranged between the adjacent preformed sheath strips. The adjacent preformed sheath strips are ultrasonically welded, and the polypropylene material layer is used to control the interface strength of the ultrasonic welding to be tearable. The ring-shaped sheath is internally provided with a central reinforcing member, and the central reinforcing member is internally provided with a fiber assembly.

2. An ultrasonic fusion-sheathed optical cable according to claim 1, wherein, The central reinforcing member is internally provided with a sleeve, and a longitudinal groove is arranged on the inner surface of the central reinforcing member. The longitudinal groove is arranged in a spiral shape around the central axis of the central reinforcing member, and the sleeve is spirally twisted and connected with the central reinforcing member.

3. An ultrasonic fusion-sheathed optical cable according to claim 2, wherein, The pitch of the longitudinal groove is the same as the spiral twisting pitch of the sleeve, and the diameter of the longitudinal groove is 0.1-0.5 mm larger than the diameter of the sleeve.

4. An ultrasonic fusion-sheathed optical cable according to claim 1, wherein The preformed sheath strips are arranged around the central reinforcing member in two, and each preformed sheath strip is arranged in a semicircle on the outer surface of the central reinforcing member.

5. An ultrasonic fusion-sheathed optical cable according to claim 1 wherein, The preformed sheath strips are arranged around the central reinforcing member in four, and each preformed sheath strip is arranged in a quarter circle on the outer surface of the central reinforcing member.

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