A rodent protection optical cable based on a bite trap and a manufacturing method thereof

Abstract

The application discloses a rodent protection optical cable based on a bite trap and a manufacturing method thereof. The optical cable comprises a cable core and an outer sheath covering the cable core; the outer sheath is made of a high polymer thermoplastic material, has a Shore hardness of 50-62, a smooth and round surface and a diameter of 8.5-18 mm; a plurality of hard bite-proof strips are embedded in the outer sheath; the hard bite-proof strips are directly embedded in the outer sheath; the plurality of hard bite-proof strips are uniformly arranged along the circumferential direction, and the arc length between adjacent hard bite-proof strips is 3-13 mm. The outer sheath of the application is uniformly arranged with the relatively parallel hard bite-proof strips along the circumferential direction, so that the outer sheath of the optical cable can be effectively protected from being damaged by rodents, and the design defect of the conventional rodent protection optical cable lacking in the rigidity of the outer sheath is solved. The manufacturing method provided by the application is simple and reasonable, can be implemented without special optical cable equipment, the process quality and production process are easy to control, the production efficiency is high, and the manufacturing cost is low.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical communication, and more particularly relates to a rodent protection optical cable based on a bite trap and a manufacturing method thereof. BACKGROUND

[0002] The construction speed of domestic 5G networks and intelligent power grid PFTTH is getting faster and faster. In the mountainous areas with developed vegetation and good natural conditions, there are often a large number of rodents breeding and living. As a kind of strong life force rodents, due to the very developed and growing incisors, rodents usually have the habit of gnawing objects to keep their teeth sharp and maintain the appropriate length of their teeth. When the optical cable laid in the mountainous areas or the pipeline of the building becomes the gnawing object of rodents, the outer protective layer and even the cable core of the optical cable are easily damaged, thereby causing the interruption of the optical cable line and bringing serious impact on the stable operation of communication services and network maintenance. The optical communication industry also conducts research on the prevention of animal protection optical cable.

[0003] CN104503051A discloses a kind of anti-rat bite steel belt armored optical cable, comprising metal hose;Two parallel placed optical fibers are arranged in the metal hose, first aramid and optical cable inner and outer sheath are sequentially sleeved on the outer surface of each optical fiber, metal woven mesh, second aramid and optical cable outer sheath are sequentially sleeved on the outer surface of the metal hose. The present application can maintain the original mechanical properties for a long time, and solve the problems of poor softness, non-waterproof inner and outer sheath of existing anti-rat bite optical cable.

[0004] CN113985550A discloses a kind of layer-stranded anti-rat bite optical cable, comprising: protective sheath, binding yarn layer, cable core filling glue, optical fiber and reinforcing steel wire, the binding yarn layer is coaxially arranged in the protective sheath, the binding yarn layer is filled with cable core filling glue, a plurality of optical fibers are arranged in the cable core filling glue, the reinforcing steel wire is coaxially arranged in the protective sheath, the reinforcing steel wire is located in the cable core filling glue, the composite steel belt is arranged between the binding yarn layer and the protective sheath, the present application can adopt multi-layer mouse element.

[0005] In the existing technical solutions, the anti-rat element is arranged in the inner layer of the outer sheath, and the anti-rat strategy adopts the reinforcement of full circumferential armor, such as the various layers of armor and inner and outer sheaths in CN104503051A, and the wrapping of iron mesh and composite steel belt in CN113985550A. However, so far, no matter how thick the armor is, it only increases the difficulty of gnawing for rodents and improves the tolerance time of the optical cable in the state without outer sheath. However, the damage of the optical cable, especially the outer sheath, is inevitable, which leads to the rusting of the metal layer inside the outer sheath of the optical cable and loses the protection function of rodents. Moreover, the production efficiency of the optical cable is low, the processing cost is increased, and the procurement cost is increased in a roundabout way. SUMMARY

[0006] In view of the above defects or improvement needs of the prior art, the present application provides a rodent protection optical cable based on biting trap and a manufacturing method thereof, which aims to improve the strength of the outer sheath by uniformly arranging suitable bite-proof bars around the outer sheath, and to make the "teething" phenomenon by using the biting trap, so as to aggravate the oral discomfort of the rodent when biting the optical cable, thereby abandoning the biting of the optical cable, and finally protecting the outer sheath from being worn by the built-in hard bite-proof bars, thereby solving the technical problems that the prior art cannot effectively prevent the rodent from biting, and the wear of the outer sheath seriously affects the service life of the optical cable.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a rodent protection optical cable based on biting trap is provided, comprising a cable core and an outer sheath wrapped around the cable core.

[0008] The outer sheath is made of high molecular thermoplastic material, with a Shore hardness of 50-62 and a smooth surface, and a diameter of 8.5-18 mm.

[0009] The outer sheath is embedded with a plurality of hard bite-proof bars; the hard bite-proof bars are directly embedded in the outer sheath; the plurality of hard bite-proof bars are uniformly arranged in the circumferential direction, and the arc length between adjacent hard bite-proof bars is 3-13 mm.

[0010] Preferably, the distance between the hard bite-proof bars and the outer circumferential surface of the outer sheath of the rodent protection optical cable based on biting trap is 0.6-0.8 mm.

[0011] Preferably, the outer sheath of the rodent protection optical cable based on biting trap is embedded with more than 4 hard bite-proof bars, preferably an even number of bite-proof bars; preferably 4-6.

[0012] Preferably, the arc length between adjacent hard bite-proof bars of the rodent protection optical cable based on biting trap is 5-8 mm, preferably 5.4-6.5 mm.

[0013] Preferably, the cross section of the hard bite-proof bar of the rodent protection optical cable based on biting trap is preferably circular, with a diameter of 1.0-1.2 mm.

[0014] Preferably, the elastic modulus of the hard bite-proof bar of the rodent protection optical cable based on biting trap is 50-210 GPa, the Brinell hardness HB of the hard bite-proof bar is 12-179, preferably 140-170, and the hard bite-proof bar is preferably phosphatized steel wire, twisted steel strand or glass fiber rod.

[0015] Preferably, the rodent protection optical cable based on snap-trap, the surface of the hard bite-proof strip is covered with blade-like teeth, the radial depth of the blade-like teeth is between 0.1mm and 0.35mm, and the circumferential arrangement of the teeth is 4-8 teeth.

[0016] Preferably, the rodent protection optical cable based on snap-trap, the outer sheath diameter is between 8.5mm and 10.2mm or between 13mm and 18mm.

[0017] Preferably, the rodent protection optical cable based on snap-trap, the outer sheath, the thickness is between 2.4mm and 3.1mm, the material density is 0.955-0.978g / cm 3 , the tensile strength is between 26MPa and 33MPa, and the material is preferably high-density polyethylene.

[0018] Preferably, the rodent protection optical cable based on snap-trap, the outermost layer of the cable core is a metal armor layer, and the tensile strength is between 350MPa and 400MPa.

[0019] Preferably, the rodent protection optical cable based on snap-trap, the metal armor layer has corrugations.

[0020] Preferably, the rodent protection optical cable based on snap-trap, the metal armor layer has a corrosion resistance of >7, and the metal armor layer is preferably a stainless steel metal armor layer.

[0021] According to another aspect of the present application, a manufacturing method of the rodent protection optical cable based on snap-trap is provided, which comprises the following steps:

[0022] The cable core is fed out with constant tension and passes through the extruder head;

[0023] The metal strip passes through the longitudinal wrapping forming die and forms a longitudinal wrapping outside the cable core;

[0024] The prefabricated hard bite-proof strip is uniformly arranged outside the cable core with the longitudinal wrapping metal strip by passing through the die cover of the extruder head from the preset position; the prefabricated hard bite-proof strip is preferably phosphatized steel wire, twisted steel wire, or glass fiber rod (FRP), and when the surface is covered with blade-like teeth, the phosphatized steel wire is drawn through a drawing die to form a blade-like tooth on the surface of the steel wire;

[0025] The thermoplastic outer sheath material is extruded outside the metal strip, the hard bite-proof strip is embedded in the outer sheath material, and the outer sheath is formed after cooling.

[0026] Overall, compared with the prior art, the above technical solutions conceived by the present application can achieve the following beneficial effects:

[0027] 1. The hard anti-biting strips are arranged in the circumferential direction of the outer sheath and are relatively parallel, which can effectively protect the outer sheath of the optical cable from being damaged by rodents, and solve the problem of lack of rigidity design of the outer sheath of the conventional anti-rodent optical cable, that is, the metal corrosion and water blocking caused by the biting of the outer sheath.

[0028] 2. The optical cable uses the anti-biting strip sheath, and the entire outer sheath becomes a whole, so even if there is a small biting defect point, it will not become a continuous biting object of rodents, so the optical cable has good lateral pressure resistance.

[0029] 3. The manufacturing method provided by the application is simple and reasonable, and can be implemented without special optical cable equipment, the process quality and production process are easy to control, the production efficiency is high, and the manufacturing cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram of the rodent protection optical cable structure based on the biting trap provided by the application;

[0031] Figure 2 It is a schematic diagram of the position of the optical cable between the lower incisors and molars when biting occurs;

[0032] Figure 3 It is a schematic diagram of the position of the optical cable between the upper and lower incisors when biting occurs;

[0033] Figure 4 It is a photograph of the typical rodent jaw, Figure 4 A is a bamboo rat jaw, Figure 4 B is a northern squirrel jaw, Figure 4 C is a brown rat jaw;

[0034] Figure 5 A schematic diagram of the occlusion of a typical rodent, wherein Figure 5 A is a bamboo rat, Figure 5 B is a northern squirrel, Figure 5 C is a brown rat;

[0035] Figure 6 It is an optical cable bitten by rodents, wherein Figure 6 A is an armored optical cable, Figure 6 B is a full-dielectric optical cable;

[0036] Figure 7 It is a simulated rodent metal tooth, wherein Figure 7 A is a small simulated tooth, Figure 7 B is a medium-sized simulated tooth, Figure 7 C is a large simulated tooth;

[0037] Figure 8 It is the performance test result of the existing armored optical cable anti-rat optical cable;

[0038] Figure 9 The results of performance tests on existing rodent-proof optical cable outer sheaths;

[0039] Figure 10 This is a schematic diagram of the rodent protection optical cable structure based on a bite trap provided in Example 2;

[0040] Figure 11 This is a schematic diagram of the rodent protection optical cable structure based on a bite trap provided in Example 3.

[0041] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1 is optical fiber, 2 is rigid anti-chewing strip, 3 is outer sheath, 4 is central reinforcement, 5 is metal armor layer, 6 is water-blocking tape, 7 is optical fiber loose tube, and 8 is filler rope. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0043] The rodent-protective optical cable based on a bite trap provided by this invention, such as... Figure 1 As shown, it includes the cable core and the outer sheath surrounding the cable core;

[0044] The cable core has an outermost metal armor layer, preferably a stainless steel metal armor layer with a tensile strength between 350-400 MPa and a corrosion resistance (0.1 mol / L, HCl, 480 h) > 7. The high strength of the metal armor layer provides shape support when the optical cable is subjected to biting, enabling the biting trap to function. Simultaneously, to ensure good overall bending performance of the optical cable, roll embossing technology is used to create corrugations in the metal armor layer, ensuring the optical cable is easy to bend.

[0045] The outer sheath is made of a high-molecular thermoplastic material, typically high-density polyethylene, with a thickness between 2.4-3.1 mm and a material density of 0.955~0.978 g / cm³. 3 The tensile strength is between 26MPa and 33MPa, the Shore hardness is between 50 and 62, the surface is round and smooth, and the diameter is between 8.5 and 18mm, preferably between 8.5 and 10.2mm, or between 13 and 18mm.

[0046] The outer sheath is embedded with a plurality of hard anti-biting bars; the hard anti-biting bars are directly embedded in the outer sheath; an even number of the hard anti-biting bars are uniformly arranged in the circumferential direction, the arc length between adjacent hard anti-biting bars is between 3mm and 13mm, preferably between 5mm and 8mm, more preferably 5.4-6.5mm, referring to the arc length between the centers of the hard anti-biting bars. In a preferred embodiment, the distance between the hard anti-biting bars and the outer side circumference of the outer sheath is between 0.6-0.8mm, i.e. the thickness of the thinnest part of the outer sheath on the outside of the hard anti-biting bars. In a preferred embodiment, the outer sheath is embedded with more than 4 hard anti-biting bars, preferably an even number of anti-biting bars; preferably 4-6. An even number of anti-biting bars is stable under stress and can better help the "bite trap" to function, especially when the optical cable is bitten and is between the upper and lower teeth.

[0047] The hard anti-biting bars have an elastic modulus of between 50GPa and 210GPa, and a Brinell hardness HB of the hard anti-biting bars of between 12 and 179, preferably between 140 and 170, and a cross-section that is preferably circular with a diameter of between 1.0-1.2mm.

[0048] The hard anti-biting bars are preferably phosphatized steel wires, twisted steel strands, or glass fiber rods (FRP).

[0049] In a preferred embodiment, the surface of the hard anti-biting bars is covered with blade-like teeth with a radial depth of between 0.1mm and 0.35mm, and 4-8 teeth are arranged circumferentially.

[0050] Considering that the main reason for rodents biting optical cables is grinding teeth, the rodent protection optical cable provided by the present application designs a "bite trap" for the biting action of rodents: the outer sheath surface is smooth, the modulus is low relative to the hard anti-biting bars arranged inside, and the hard anti-biting bars are parallel to each other, and adjacent hard anti-biting bars form a "bite trap", which makes rodents feel uncomfortable in the mouth when biting the optical cable, thereby abandoning the optical cable.

[0051] Experimental observation shows that the "bite trap" functions at least in the following two ways:

[0052] When the outer sheath diameter is relatively small compared to the rodent's mouth, the rodent bites the optical cable, and the upper and lower teeth occlusion action will first cause a pair of adjacent hard anti-biting bars to slide into the gap between the incisors and molars of the rodent's lower jaw, as shown in Figure 2 This pair of hard anti-biting bars forms a "bite trap". When the biting action continues, due to the pressure generated by occlusion, the "bite trap" will further penetrate into the gap between the incisors and molars of the rodent's lower jaw, causing the rodent's lower incisors and molars to be subjected to lateral impact forces.

[0053] When the diameter of the outer sheath is relatively large compared to the size of the rodent's mouth, the upper and lower teeth of the rodent will slide into the "bite trap" formed by a pair of adjacent hard bite-proof bars when the upper and lower teeth of the rodent are closed, as shown in Figure 3 When the bite action continues, the "bite trap" with a large modulus will fix the angle of the upper and lower teeth, so that the upper and lower teeth of the rodent are subjected to a lateral impact force.

[0054] In the above two cases, due to the large modulus and high hardness of the "bite trap", the lower teeth of the rodent and the molars or the upper and lower teeth are subjected to a lateral impact force, i.e. "tooth knocking", during the process of further deepening the gap between the teeth and the molars or fixing the angle of the upper and lower teeth. The greater the biting force of the rodent, the more severe the discomfort in the mouth of the rodent caused by "tooth knocking", so that the rodent gives up biting the optical cable before the outer sheath is damaged, thereby maintaining the integrity of the outer sheath by using the "bite trap" provided inside the outer sheath of the optical cable, avoiding damage by the rodent, and protecting the overall armor structure of the optical cable. Due to the structure of the rodent's mouth, according to the way it chews food and the size of the food it eats, the positions of the hard bite-proof bars that play the role of "bite trap" are basically equivalent when the above two situations occur, and the "tooth knocking" effect of the "bite trap" occurs between the lower teeth and the molars or between the upper and lower teeth, mainly determined by the diameter of the outer sheath of the optical cable relative to the size of the rodent.

[0055] As can be seen from the above, the distance between the two hard bite-proof bars that make up the "bite trap" is the key to the function of the "bite trap". If the position of the hard bite-proof bar is too wide, the "bite trap" cannot slide into the gap between the teeth and the molars or cannot fix the angle of the upper and lower teeth, and cannot play the role of "bite trap", so the rodent will still bite the outer sheath or even the hard bite-proof bar. If the relative position of the hard bite-proof bar is too narrow, it cannot produce a significant lateral impact force during the continuous biting action, causing discomfort in the mouth of the rodent and preventing the rodent from continuing to bite.

[0056] In addition, the cable core armor provides good support for the "bite trap", maintains the position of the hard bite-proof bar, and keeps the distance stable, forming the shape of the "bite trap" when the rodent bites. Therefore, the cable core armor can help the "bite trap" to better and more durably prevent biting.

[0057] The distance between the hard bite-proof bar and the outer circumference of the outer sheath affects the effect of the "bite trap". If the distance is too small, the outer sheath is easily damaged, and the incomplete outer sheath cannot provide a good "bite trap" effect, and secondary biting is likely to occur at the damaged part. If the distance is too small, the "tooth knocking" feeling is not obvious due to the buffering effect of the outer sheath, and the rodent cannot be prevented from continuing to bite the outer sheath.

[0058] When the hard anti-biting strip is coated with the blade-shaped teeth, the discomfort of "biting teeth" is more obvious.

[0059] Meanwhile, the hard anti-biting strip improves the overall strength of the sheath, disperses the biting force applied by the oral cavity of the rodent, and helps to improve the anti-rodent performance.

[0060] The method for manufacturing the rodent protection optical cable provided by the present application comprises the following steps:

[0061] The cable core is put out with constant tension and passes through the head of the extruder;

[0062] The metal belt passes through the longitudinal wrapping setting mold and passes through the head of the extruder, so that the longitudinal wrapping is formed outside the cable core;

[0063] The prefabricated hard anti-biting strip is uniformly arranged outside the cable core with the longitudinal wrapping metal belt by passing through the mold cover of the head of the extruder from the preset position; the prefabricated hard anti-biting strip is preferably phosphatized steel wire, twisted steel strand or glass fiber rod (FRP), and when the surface is coated with blade-shaped teeth, the phosphatized steel wire is drawn into a wire shape through a wire drawing die to manufacture the blade-shaped teeth on the surface of the steel wire,

[0064] The thermoplastic outer sheath material is extruded outside the metal belt, the hard anti-biting strip is embedded in the outer sheath material, and the outer sheath is formed after cooling.

[0065] The following is an example:

[0066] Regarding the test of the protection effect of the optical cable on rodents, it is necessary to simulate the process of rodents biting the optical cable. According to the following method, the existing research simulates the biting of rodents: first, the structure of the jaw bones of bamboo rats, northern squirrels and brown rats collected by the experiment is used as the rodent with large body size, medium body size and small body size, respectively, as shown in Figure 4 As can be seen from the appearance, although the appearance of the jaw bones of different rodents is quite different, the main features are similar: each rodent has a pair of upper and lower incisors and molars for grinding food, the incisors have no roots, there is a large gap between the incisors and the molars, and there are no canines; the incisors are only wrapped with enamel on the labial surface, so the soft tooth structure on the inner side is consumed faster than the labial surface during biting, forming a sharp chisel-shaped incisor structure.

[0067] As can be seen from the occlusion action of the jaw bones of each rodent, the occlusion actions of each rodent are similar, and are obtained by closing the upper and lower incisors, as shown in Figure 5 .

[0068] Therefore, in the process of biting the optical cable, the incisors are used to cause damage to the optical cable first. Because the enamel is hard and wear-resistant, it is difficult to prevent the outer sheath from being bitten to breakage by the reinforced armor inside the optical cable outer sheath, and finally the cable core and even the armor of the optical cable will be bitten and damaged, as shown in the following figure.

[0069] Then estimate the biting force of rodents for model experiments, the current study shows that the biting force conforms to the following empirical formula:

[0070] The method for calculating the biting force of rodents according to their body weight and jaw size is shown in formula (1) and formula (2).

[0071] lg B =0.43xlg M +0.416 (1)

[0072] In the formula: B is the biting force, unit: N, M is the body weight of the rodent sample, unit: g.

[0073] lg B =0.566xlg zi +1.432 (2)

[0074] In the formula: Zi is the rectangular cross-section bending coefficient of the jaw, which is calculated by formula (3).

[0075] Zi=LxW 2 / 6 (3)

[0076] In the formula: L is the length between the tip of the lower jaw incisor and the lowest point of the gap between the incisor and the molar, unit: mm; W is the width of the lower jaw incisor, unit: mm;

[0077] Formula (1) can be used to simply calculate the biting force, and according to the jaw size of the rodent sample, formula (2) can be used to calculate the biting force of all rodent samples with high accuracy. When the biting force of the rodent species cannot be directly measured, formula (2) can be used to accurately predict the size of the biting force.

[0078] Calculate the biting force according to the jaw size:

[0079] According to the above analysis, combined with the body weight characteristics of the northern squirrel, the bamboo rat and the brown rat, and the size of the jaw sample, the biting force can be calculated and predicted, as shown in the following table 1:

[0080] Table 1 Biting force of rodents

[0081]

[0082] The jaw structure of the northern squirrel, the bamboo rat and the brown rat, three replaceable simulated rodent teeth made of titanium alloy are used, such as Figure 7As shown, the small teeth, medium teeth and large teeth respectively simulate the incisors of the brown rat, the northern squirrel and the bamboo rat. By selecting specific simulated mouse teeth, the performance of specific mouse gnawing on the optical cable can be simulated and analyzed by using the gnawing simulation tester. Referring to the “GBT 29199-2012 Optical Cable Rodent Resistance Performance Test Method”.

[0083] The results of the simulated mouse gnawing test on metal tape armored cable samples with different diameters show that: (1) single gnawing only causes slight damage to the outer sheath; (2) with the same number of gnawing, greater gnawing force will significantly increase the damage to the outer sheath; (3) with the same gnawing position, increasing the number of gnawing will deepen the damage to the outer sheath. When the number of gnawing and the depth of gnawing increase to a certain extent, the gnawing effect tends to be balanced, and after that, with the increase in the number of gnawing, the damage to the outer sheath is very slow, and the gnawing force required to pierce the entire outer sheath is very large; (4) the polyethylene outer sheath layer has a small hardness. As long as the teeth cause damage to the outer sheath, the outer sheath will gradually wear out under complex repeated gnawing actions and lose its protective effect. See “Rodent Resistant Cable Performance Research”, China Communications Standards Association 2014B30, 2018.

[0084] The test results are shown in Figure 8 : Sample 1 is GYTS-24B1.3, with an outer diameter of 9.8mm; Sample 2 is GYTA53-48B1.3, with an outer diameter of 13.5mm; Sample 3 is GYTA53-72B1.3, with an outer diameter of 15.5mm, and the metal tape thickness is 0.12mm.

[0085] Using polyethylene outer sheath cable samples, gnawing tests were conducted under fixed gnawing forces of 60N and 80N, with 1, 10, 50, 100, and 500 gnawing times. The outer diameter of the cable sample is 9.4mm, and the results of the outer sheath layer surface under the damage of the upper and lower teeth after the test are shown in Figure 9 .

[0086] The diameter of the cable affects the position of the upper and lower incisors applying the gnawing force, and affects the effect of protection against gnawing. Analysis of the results shows that within a certain range, as the outer diameter of the cable sample increases, the depth of the tooth marks on the metal tape produced by the same gnawing force and number of gnawing times becomes shallower and shallower. Further observation and analysis of the actual gnawing action of rodents on the cable shows that when the cable diameter is large, gnawing occurs between the upper and lower incisors, and an increase in cable diameter helps to prevent gnawing. When the cable diameter is small (9.4mm), gnawing occurs between the lower incisors and the molars, and an increase in gnawing force and number of gnawing times significantly increases the damage to the cable.

[0087] The above test method is applied to the rodent resistance performance test of the optical cable provided in the embodiment.

[0088] Embodiment 1

[0089] The optical cable structure provided in the embodiment, as shown in Figure 1 includes an outer sheath 3, a hard anti-biting strip 2 is covered in the outer sheath, the hard anti-biting strip 2 is fixed in the outer sheath 3 in a 90° relative parallel distribution in four directions, has a circular cross section, the outer sheath 3 tightly covers a metal armor layer 5, a water-blocking tape 6 is arranged below the metal armor layer 5, and four optical fiber loose tubes 7 are arranged below the water-blocking tape 6, the optical fiber loose tubes 7 are stranded around the plastic center strength member 4 at a certain pitch, and the pitch parameter is generally 70-80 mm, wherein a plurality of optical fibers 1 are arranged in the optical fiber loose tube 7, and in order to facilitate identification of the optical fiber loose tubes 7 at different positions, the optical fiber loose tubes 7 are made into different colors.

[0090] The specific parameters of each embodiment are shown in Tables 2 and 3 as follows:

[0091] Table 2

[0092]

[0093] Table 3 Hard Anti-biting Strip Parameters

[0094]

[0095] The anti-biting performance test results are shown in Table 4 as follows:

[0096] Table 4

[0097]

[0098] Wherein, slight wear refers to bite marks on the surface of the outer sheath, but the outer sheath is generally round; obvious wear refers to deeper bite marks on the surface of the outer sheath, which cannot maintain a round outer sheath, but the cable core is not exposed; and severe wear refers to deep bite marks on the surface of the outer sheath, which penetrates the outer sheath and exposes the cable core.

[0099] In the actual test process, since rodents are more likely to give up biting or the biting force is not large enough, the service life of the outer sheath is improved more obviously.

[0100] Embodiment 2

[0101] The optical cable structure provided in the embodiment, as shown in Figure 10As shown, including the outer sheath 3, in the outer sheath coated with hard anti-bite strip 2, the hard anti-bite strip 2 is 90° in four directions relative to parallel distribution fixed in the outer sheath 3, with a circular cross section, the outer sheath 3 tightly coated with metal armor layer 5, metal armor layer 5 below the water-blocking tape 6, below the four optical fiber loose tube 7, optical fiber loose tube 7 with a certain pitch around the plastic center reinforcing member 4, pitch parameters generally in 70-80mm, wherein the optical fiber loose tube 7 placed with a plurality of optical fibers 1, at the same time in order to facilitate the identification of different positions of the optical fiber loose tube 7, the optical fiber loose tube 7 will be made into different colors.

[0102] Hard anti-bite strip surface coated with blade-like teeth, the blade-like teeth radial depth between 0.1mm~0.35mm, circumferential arrangement 4~8 teeth.

[0103] The specific parameters of each embodiment are shown in Tables 5 and 6 as follows:

[0104] Table 5

[0105]

[0106] Table 6 Hard anti-bite strip parameters

[0107]

[0108] The results of the anti-bite performance test are shown in Table 7:

[0109] Table 7

[0110]

[0111] Wherein the slight wear refers to the bite marks on the surface of the outer sheath, but generally in a round state; the obvious wear refers to the bite marks on the surface of the outer sheath being deeper, and the outer sheath cannot maintain a round state, but the cable core is not exposed; the severe wear refers to the bite marks on the surface of the outer sheath being deep, penetrating the outer sheath, and the cable core being exposed.

[0112] In the actual test process, since the rodents are more likely to give up biting, or the biting force is not large enough, the service life of the outer sheath is improved more obviously. The blade-like teeth of the hard anti-bite strip can also significantly reduce the number of bites by rodents.

[0113] Example 3

[0114] The optical cable structure provided in this example is as follows: Figure 11As shown, including the outer sheath 3, in the outer sheath coated with hard anti-bite strip 2, the hard anti-bite strip 2 is 60° in 6 directions relative to parallel distribution fixed in the outer sheath 3, with a circular cross section, the outer sheath 3 tightly coated with metal armor layer 5, metal armor layer 5 below the water-blocking tape 6, below the water-blocking tape 6 there are four optical fiber loose tube 7, optical fiber loose tube 7 with a certain pitch around the plastic center reinforcing member 4, pitch parameters generally in 70-80mm, wherein the optical fiber loose tube 7 placed with a plurality of optical fibers 1, at the same time in order to facilitate the identification of different positions of the optical fiber loose tube 7, the optical fiber loose tube 7 will be made into different colors.

[0115] The specific parameters of each embodiment are shown in Tables 8 and 9 as follows:

[0116] Table 8

[0117]

[0118] Table 9 Hard anti-bite strip parameters

[0119]

[0120] The results of the anti-bite performance test are shown in Table 10:

[0121] Table 10

[0122]

[0123] Wherein the slight wear refers to the bite marks on the surface of the outer sheath, but generally in a round state; the obvious wear refers to the bite marks on the surface of the outer sheath being deeper, and the outer sheath cannot maintain a round state, but the cable core is not exposed; the serious wear refers to the bite marks on the surface of the outer sheath being deep, penetrating the outer sheath, and the cable core being exposed.

[0124] In the actual test process, since the rodents are more likely to give up biting, or the biting force is not large enough, the service life of the outer sheath is improved more obviously.

[0125] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rodent protection optical cable based on a bite trap, characterized in that, The cable core and the outer sheath of the cable core; The outer sheath is made of high polymer thermoplastic material, with Shore hardness between 50 and 62, tensile strength between 26 MPa and 33 MPa, smooth surface, and diameter between 8.5 and 10.2 mm or between 13 and 18 mm; The outer sheath is embedded with a plurality of hard anti-biting bars; the elastic modulus of the hard anti-biting bars is between 50 GPa and 210 GPa, the Brinell hardness HB of the hard anti-biting bars is between 140 and 170, the hard anti-biting bars are directly embedded in the outer sheath, the outer sheath is embedded with an even number of 4 or more hard anti-biting bars, and the plurality of hard anti-biting bars are uniformly arranged in the circumferential direction, with the arc length between adjacent hard anti-biting bars, i.e. the arc length between the centers of the hard anti-biting bars, being between 5.4 mm and 6.5 mm.

2. The rodent guard optical cable based on snap-trap traps as claimed in claim 1, wherein, The distance between the hard anti-biting bars and the outer side circumference of the outer sheath is between 0.6 mm and 0.8 mm.

3. The rodent guard optical cable based on bite trap according to claim 1, characterized in that, The hard anti-biting bars are 4 to 6 in number.

4. The rodent guard optical cable based on bite trap according to claim 1, wherein, The hard anti-biting bars have a circular cross-section with a diameter between 1.0 and 1.2 mm.

5. The rodent guard optical cable based on bite trap according to claim 1, wherein, The hard anti-biting bars are phosphatized steel wires, twisted steel strands, or glass fiber rods.

6. The rodent guard optical cable based on bite trap according to claim 1, wherein, The hard anti-biting bars are covered with blade-shaped teeth with a radial depth of 0.1 mm to 0.35 mm and 4 to 8 teeth arranged in the circumferential direction.

7. The rodent guard optical cable based on bite trap according to claim 1, wherein, The outer sheath has a thickness of 2.4-3.1 mm and a material density of 0.955-0.978 g / cm 3 .

8. The rodent guard optical cable based on bite trap according to claim 1, wherein, The outer sheath is made of high-density polyethylene.

9. The rodent guard optical cable based on bite trap according to claim 1, wherein, The outermost layer of the cable core is a metal armor layer with a tensile strength of 350-400 MPa.

10. The rodent guard optical cable based on bite trap according to claim 9, characterized in that, The metal armor layer has corrugations.

11. The rodent guard optical cable based on bite trap according to claim 9, characterized in that, The metal armor layer has a corrosion resistance of >7.

12. The rodent protection optical cable based on bite-trap traps according to claim 9, wherein, The metal armor layer is a stainless steel armor layer.

13. A method of making a gnawing-trap based rodent-guarded optical cable according to any one of claims 1 to 12, wherein, The method comprises the following steps: The cable core is unwound at a constant tension and passed through the head of an extruder; A metal strip is passed through a longitudinal wrapping forming die to form a longitudinal wrapping outside the cable core; Preformed hard anti-biting bars are arranged uniformly outside the cable core with the longitudinal wrapping metal strip by passing through the die cover of the extruder head at a preset position; A thermoplastic outer sheath material is extruded outside the metal strip to embed the hard anti-biting bars in the outer sheath material, and the outer sheath is formed after cooling.

14. The method for manufacturing a rodent-protective optical cable based on a bite trap as described in claim 13, characterized in that, The preformed hard anti-biting bars are phosphatized steel wires, twisted steel strands, or glass fiber rods, and when the surface is covered with blade-shaped teeth, phosphatized steel wires are used to form the blade-shaped teeth on the surface of the steel wires by drawing through a drawing die.

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