Cable non-metal strip longitudinal wrapping method and device

Abstract

The invention relates to a cable non-metal strip longitudinal wrapping method and device, and the method comprises the steps: determining the number of strips, the circumferential distribution angle of the strips on the surface of a wire core, and the length and width of an arc formed by the strips during the longitudinal wrapping according to the diameter and perimeter of the wire core of a cable to be longitudinally wrapped, and further determining the size of a ring part required for guiding the strips; the size of the circular ring piece comprises the outer circumference and the inner circumference of the circular ring piece and the arc length and the width of an arc-shaped hole for guiding the strip in the circular ring piece; a strip to be longitudinally wrapped sequentially penetrates through the corresponding arc-shaped holes in the circular ring piece and the forming ring and then is fixed to the surface of the wire core. The oblique straight line distance from the arc-shaped hole to the surface of the wire core is controlled by adjusting the diameter of the circular ring piece; and when the strip penetrating through the arc-shaped hole can be tightly attached to the surface of the cable core and has no wrinkles, longitudinal wrapping is executed by pulling the cable core, and a longitudinally wrapped cable is obtained. Through a series of calculation steps and a parameter adjustment method, the problem that the width and the number of strips in a traditional longitudinal wrapping process are not matched with the perimeter of a cable is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable manufacturing, and particularly to a method and device for longitudinally wrapping non-metallic tapes of a cable. Background Art

[0002] The statements in this part merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The longitudinal wrapping process of non-metallic tapes of a cable refers to that when the cable is manufactured, the tapes are continuously wrapped along the axial direction (length direction) of the cable. In this way, the edges of the tapes are parallel to the cable axis.

[0004] The existing longitudinal wrapping process for cable production has obvious defects. When the tapes and the cable move coaxially, the width and number of the tapes are likely to be mismatched with the cable circumference. If the tapes are too narrow or the number of tapes is too small, the surface of the cable semi-finished product cannot be completely covered by the tapes, resulting in the phenomenon of missed wrapping.

[0005] For example, when longitudinally wrapping non-woven fabric after the cable armor layer, once there is a missed wrapping, when extruding the outer sheath, the steel tape serving as the armor layer may scratch the outer sheath, causing the cable to be vulnerable to the external environment, the electrical insulation performance to decline, the service life to be shortened, and even safety accidents such as short circuits and electric leakage may occur. It may also cause the armor layer and the sheath to be in direct contact due to missed wrapping, increasing the heat transfer efficiency and affecting the product performance.

[0006] On the contrary, when the tapes are too wide or the number of tapes is too large, the tapes will wrinkle during the longitudinal wrapping process, resulting in uneven thickness of the longitudinally wrapped cable. This not only destroys the appearance quality of the cable, but also causes uneven stress on each part of the cable when bearing external forces, leading to local stress concentration, reducing the mechanical strength and stability, and at the same time affecting the electrical performance, resulting in uneven electric field distribution, and further affecting the transmission efficiency and stability.

[0007] In summary, when the width and number of the tapes are mismatched with the cable circumference, it will cause quality defects of the product cable, reduce the product qualification rate, and increase the production cost. Summary of the Invention

[0008] In order to solve the technical problems existing in the above background art, the present invention provides a method and device for longitudinally wrapping non-metallic tapes of a cable. Through a series of calculation steps and parameter adjustment methods, it solves the problems of uneven tape lapping, large thickness fluctuation, and material waste caused by the mismatch between the width and number of the tapes and the cable circumference in the traditional longitudinal wrapping process. By reasonably using the multi-ring coaxial superposition structure, dynamically adapting parameters, and controlling tape friction and other technical means, it realizes the efficient and precise coating of the tapes, and provides an advanced longitudinal wrapping method with high precision and low loss for the cable manufacturing field.

[0009] The first aspect of the present invention provides a longitudinal wrapping method for non-metallic tapes of cables, comprising the following steps:

[0010] According to the core diameter and circumference of the cable to be longitudinally wrapped, determine the number of tapes, the circumferential distribution angle of the tapes on the core surface, as well as the arc length and arc width formed by the tapes during longitudinal wrapping, and further determine the dimensions of the circular ring for guiding the tapes; wherein, the dimensions of the circular ring include the outer and inner circumferences of the circular ring, and the arc length and width of the arc-shaped holes in the circular ring for guiding the tapes.

[0011] The tapes to be longitudinally wrapped pass through the corresponding arc-shaped holes in the circular ring in sequence, and after passing through the forming ring, are fixed on the core surface.

[0012] By adjusting the diameter of the circular ring, control the skew straight-line distance from the arc-shaped hole to the core surface.

[0013] When the tapes passing through the arc-shaped holes can closely adhere to the core surface without wrinkles, perform longitudinal wrapping by pulling the core to obtain the longitudinally wrapped cable.

[0014] Further, according to the core diameter and circumference of the cable to be longitudinally wrapped, determine the number of tapes and the circumferential distribution angle of the tapes on the core surface, as shown in the following formula:

[0015] Ф = πD = nd;

[0016] θ = 360*d / ((Ф 外圆 / 2π)-10);

[0017] wherein, n is the number of tapes, d is the width of the tape, D is the core diameter, Ф is the core circumference, θ is the circumferential distribution angle of the tapes, Ф 外圆 、Ф 内圆 are the outer and inner circumferences of the circular ring respectively.

[0018] Further, determine the dimensions of the circular ring for guiding the tapes, as shown in the following formula:

[0019] Ф 外圆 =(D + 100)*π;

[0020] Ф 内圆 =(D + 30)*π;

[0021] L 弧长 = 1.05*d;

[0022] L 宽 = 13.5*L 厚 ;

[0023] wherein, L 弧长 is the arc length of the arc-shaped hole required for fixing the tape, L 厚 is the thickness of the tape, L 宽To fix the width of the arc-shaped holes required for the strip, Ф 外圆 and Ф 内圆 are respectively the outer and inner circumferences of the ring-shaped part.

[0024] Furthermore, there is at least one set of ring-shaped parts. Multiple sets of ring-shaped parts are arranged with their centers at different positions according to the difference in inner diameters from small to large. A cable hole is formed inside the ring-shaped part with the smallest diameter for passing the core wire.

[0025] Furthermore, a plurality of arc-shaped holes are evenly distributed in the circumferential direction of the ring-shaped part, and each arc-shaped hole is for a corresponding strip to pass through.

[0026] Furthermore, when the strip to be longitudinally wrapped has multiple layers, the diameters of the corresponding ring-shaped parts for each layer of strip are different, and multiple sets of ring-shaped parts are combined to form a guiding assembly.

[0027] Furthermore, the diameter of the forming ring is as shown in the following formula:

[0028] D 成型圈 = D + (100 ± 10);

[0029] where D 成型圈 is the diameter of the forming ring, and D is the core wire diameter.

[0030] Furthermore, when the strip is longitudinally wrapped with overlap, the parameters of the overlap area are as shown in the following formula:

[0031] θ 重叠 = (θ / d) * L 重叠 ;

[0032] where θ 重叠 is the angle of the overlap area, and L 重叠 is the width of the overlap area.

[0033] Furthermore, during longitudinal wrapping, when the number of strips changes, by replacing the ring-shaped part with the corresponding number of arc-shaped holes and re-determining the width of the arc-shaped holes, as shown in the following formula:

[0034] W = k * w + Δ;

[0035] where W is the re-determined width of the arc-shaped hole, w is the strip width, k is the margin coefficient, and Δ is the tolerance compensation value.

[0036] The second aspect of the present invention provides a longitudinal wrapping device for non-metallic strips of a cable for implementing the above method, including a strip pay-off device, a guiding assembly, a forming ring, and a cable traction device. The cable to be longitudinally wrapped passes through the guiding assembly and the forming ring in sequence and enters the cable traction device, and moves along the axial direction under the drive of the cable traction device; the strip pay-off device draws out the strip to be longitudinally wrapped and fixes it on the surface of the cable, and passes through the guiding assembly and the forming ring in sequence under the drive of the cable, and is coated on the outer layer of the cable;

[0037] Among them, the guiding component includes multiple groups of concentrically arranged circular ring members. Each group of circular ring members has a plurality of arc-shaped holes evenly distributed in the circumferential direction, and each arc-shaped hole is for a corresponding strip to pass through.

[0038] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0039] 1. During the longitudinal wrapping preparation stage, the width and quantity of the strip are determined according to the core size, and further the dimensional parameters of the guiding component for guiding the strip are selected, so that the strip can be accurately and stably carried on the surface of the cable along the axial direction, effectively avoiding the problems of missed wrapping and wrinkles caused by improper strip width.

[0040] 2. During longitudinal wrapping, according to the cable specifications and strip conditions, by changing the cable traction speed and the gap between the circular ring members in the guiding component, the tight overlapping degree between the strips can be accurately controlled, realizing the reliable matching between the strip and the cable, improving the longitudinal wrapping quality, and dealing with the problem that the width and quantity of the strip do not match the cable circumference.

[0041] 3. Each strip is guided by the circular ring member with arc-shaped holes during longitudinal wrapping. When multiple layers of strips need to be wrapped, multiple groups of circular ring members are arranged concentrically, and together with the forming ring, the strip can be tightly attached to the outer surface of the cable, which can meet the longitudinal wrapping requirements of different specifications of cables and strips, significantly improving the longitudinal wrapping efficiency, reducing material loss, and reducing the phenomenon of missed wrapping. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings forming a part of this invention are used to provide a further understanding of the invention. The schematic embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation to the invention.

[0043] Figure 1 It is a schematic diagram of the longitudinal wrapping process of the non-metallic strip of the cable provided by one or more embodiments of the invention;

[0044] Figure 2 It is a schematic structural diagram of the guiding component in the longitudinal wrapping device of the non-metallic strip of the cable provided by one or more embodiments of the invention.

[0045] In the figure: 1 cable hole, 2 first arc-shaped hole, 3 second arc-shaped hole, 4 third arc-shaped hole, 5 fourth arc-shaped hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The present invention will be further described below in conjunction with the drawings and embodiments.

[0047] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] In the longitudinal wrapping process of the non-metallic strip of the cable, the strip is continuously wrapped along the cable axis direction (length direction). In this way, the strip edge is parallel to the cable axis, which can provide relatively higher sealing performance and protection level.

[0050] The longitudinal wrapping process is an important process in the manufacture of cable sheaths, which can enhance the mechanical strength of the cable (such as compressive resistance and tensile resistance), provide shielding performance (such as electromagnetic shielding), and improve insulation performance (such as waterproof and moisture-proof).

[0051] In the common spiral winding process, the strip is wound spirally at a certain angle, which is suitable for occasions where flexibility is required, but the covering uniformity and mechanical strength may be inferior to those of longitudinal wrapping. In the gap wrapping process, there are gaps between the strips, which is often used for heat dissipation or low-cost scenarios, and the protection effect is relatively weak.

[0052] The external materials of the cable conductor can be divided into an inner sheath, a shielding layer, and an outer sheath from the inside to the outside. Some cables will also design an armor layer between the inner sheath and the outer sheath to improve the protection ability. Generally, the inner sheath directly wraps the cable core to provide mechanical protection and insulation. The outer sheath is on the outermost layer to provide environmental protection (such as waterproof and anti-ultraviolet). The shielding layer is used for electromagnetic shielding (such as longitudinal wrapping of metal strips or braided shielding). Some special cables may also have more complex internal structures and manufacturing methods.

[0053] The longitudinal wrapping strip in this solution is generally applied between the armor layer and the outer sheath. The outer sheath is generally a polyethylene outer sheath, which is used to isolate the armor layer and the outer sheath to prevent the outer sheath from being scratched by the armor layer. At the same time, due to the high metal heat efficiency of the armor layer, in the absence of the longitudinal wrapping strip, the armor layer will directly transfer heat to the outer sheath, which easily causes the outer sheath to age and crack rapidly, directly affecting other cable performance. Therefore, adding the longitudinal wrapping strip can play a role in heat insulation and reducing the heat conduction efficiency.

[0054] As introduced in the background art, when manufacturing a cable, if a non-metallic strip is longitudinally wrapped, it is necessary to solve the problem that the width and quantity of the strip do not match the circumference of the cable. Therefore, the following embodiments provide a method and device for longitudinally wrapping a non-metallic strip of a cable. In the preparation stage, using the core diameter and circumference, the required number of strips and the strip with a suitable width are calculated, so as to select the strip specification matching the core. Then, according to the strip specification, the width and arc length of the arc-shaped hole are determined, and the distribution of the arc-shaped holes in the guiding component is determined. Then, the strip is passed through the guiding component, and the gap between the guiding components is adjusted to ensure that the strip fits tightly on the cable without wrinkles, and then the cable production equipment is started for longitudinal wrapping.

[0055] Embodiment 1:

[0056] A method for longitudinally wrapping a non-metallic strip of a cable, comprising the following steps:

[0057] Preparation stage: According to the core diameter D and circumference Ф of the cable to be longitudinally wrapped, calculate the number of strips, as shown in the following formula:

[0058] Ф = πD = nd (n is the number of strips; d is the width of the strip, mm).

[0059] According to the core diameter D and circumference Ф of the cable to be longitudinally wrapped, determine the circumferential distribution angle of the strip on the surface of the core and the size of the ring part required to guide the strip, as shown in the following formula:

[0060] Ф 外圆 = (D + 100)*π

[0061] Ф 内圆 = (D + 30)*π

[0062] θ = 360*d / ((Ф 外圆 / 2π) - 10)

[0063] where, θ is the circumferential distribution angle of the strip, °; Ф 外圆 、Ф 内圆 are the outer and inner circumferences of the ring part respectively, mm.

[0064] When the strip covers the surface of the core to form a ring, since there are multiple strips, each strip has a certain arc. During subsequent longitudinal wrapping, through the guiding component formed by the ring part with multiple arc-shaped holes, each strip is guided to fit the core. The width L 宽 and arc length L 弧长 when a single strip forms an arc can be determined according to the strip specification, so as to determine the size of the arc-shaped hole in the ring part, as shown in the following formula:

[0065] L 弧长 = 1.05*d

[0066] L宽 = 13.5 * L 厚

[0067] wherein, L 弧长 is the arc length of the arc-shaped hole required for fixing the strip, in mm; L 厚 is the thickness of the strip, in mm; L 宽 is the width of the arc-shaped hole required for fixing the strip, in mm.

[0068] It should be noted that all numerical results involved in the calculation process are rounded to the 1st decimal place according to the rounding rule, and the final output value is an integer value / a value with 1 significant figure after rounding.

[0069] In this embodiment, the structure of the guiding component is as Figure 2 shown, including a cable hole 1 at the center. A plurality of concentric ring members are arranged on the outer circumference of the cable hole 1. Each group of ring members has a plurality of arc-shaped holes evenly distributed in the circumferential direction, and the gap between multiple groups of ring members can be adjusted.

[0070] In this embodiment, the cable hole 1 is for the core to pass through, and each arc-shaped hole in each group of ring members is for accommodating a strip to pass through.

[0071] As a further implementation manner, the number of ring members is not limited and depends on the number of layers of cable strips required. For example, in this embodiment, the cable surface needs to be coated with 4 layers of strips, and each layer of strip corresponds to a group of ring members. All ring members are arranged outside the cable hole 1 in the order of increasing diameter, and respectively have a first arc-shaped hole 2, a second arc-shaped hole 3, a third arc-shaped hole 4 and a fourth arc-shaped hole 5. The width and arc length of each arc-shaped hole in each group of ring members gradually increase.

[0072] Strip threading stage: Pass the non-metallic strip through the arc-shaped holes on the selected guiding component in sequence, ensuring that the strip extends flatly in the arc-shaped holes. Ensure that the strip can form a certain arc when leaving the arc opening, which is convenient for subsequent tightly coating on the cable. A forming ring can also be set at a distance of 100 mm from the center axis of the guiding component on the outlet side of the guiding component. For example, it can be a wire ring, which is used to further ensure that after the strip is led out through the guiding component, a cylindrical shape can be quickly formed by using the forming ring, which can not only check the forming and wrapping effect, but also ensure the longitudinal wrapping quality.

[0073] The parameters of the forming ring are determined by the following formula:

[0074] D 成型圈 = D + (100 ± 10) mm

[0075] wherein, D 成型圈 is the diameter of the forming ring, in mm.

[0076] Dynamic adjustment stage: The guiding component includes a plurality of circular ring parts with arc-shaped holes of different equal division numbers, which are coaxially sleeved in the order of increasing inner diameter from small to large. The multiple arc-shaped holes form a circular mesh structure. By adjusting the diameter of the circular ring part, the oblique linear distance from the arc-shaped hole to the surface of the cable is controlled to ensure that the strip passing through the arc-shaped hole can closely adhere to the surface of the wire core without wrinkles.

[0077] If overlapping longitudinal wrapping is required, circular ring parts with different diameters can also be selected and combined for superposition. The overlapping area can be determined according to the formula:

[0078] θ 重叠 =(θ / d)*L 重叠

[0079] Where, θ 重叠 is the overlapping area angle, °; L 重叠 is the width of the overlapping area, mm.

[0080] It should be noted that if overlapping longitudinal wrapping is required, the overlapping longitudinal wrapping effect can be achieved by calculating the difference value or overlapping width between the starting angles of the first arc-shaped holes in two adjacent groups of circular ring parts and adjusting the difference angle of the starting points of the two groups of circular ring parts.

[0081] Traction and fixation stage: After one end of the strip is led out a certain distance through the guiding component, it is wrapped on the surface of the cable according to the longitudinal wrapping design position and fixed with high-temperature resistant tape. To prevent misalignment and affect the longitudinal wrapping effect.

[0082] Longitudinal wrapping stage: Start the cable traction equipment to make the cable travel along the axial direction at a set speed. It is designed that the strip unwinding has no tension, and the tension is determined by the traction speed of the cable to be wrapped. This can ensure that the longitudinal wrapping is stretched without excessive tension because the strip has a certain radial arc when passing through the guiding component. And the position of the arc-shaped hole does not need to be horizontal with the strip unwinding place (the limitation of the strip placement position can be eliminated). Without unwinding tension, the stress on the strip can be reduced, and it can change with the traction speed, which is more convenient. The strip is evenly led out from the arc-shaped hole and forms a cylindrical wrapping structure on the surface of the cable, realizing the multi-angle equal division extraction of the strip within 360° and evenly wrapping it on the outer layer of the cable.

[0083] Adjustment and optimization stage: During the longitudinal wrapping process, the device parameters are adjusted in real time according to the cable specifications and the actual situation of the strip. For different requirements of the number of strip roots, it can be satisfied by replacing the guiding component with the corresponding number of arc-shaped holes; for the width of the arc-shaped hole, it can be calculated according to the formula:

[0084] W = k*w + Δ

[0085] Where, W is the re-determined width of the arc-shaped hole, mm; w is the width of the strip, mm; k is the margin coefficient, and the value range is 1.02 - 1.06, Δ is the tolerance compensation value, and the value range is 0.2 - 0.5mm.

[0086] For ultra-thin strip materials, a polytetrafluoroethylene gasket can be added inside the arc-shaped hole to reduce the frictional resistance of the strip and avoid tensile deformation.

[0087] In the longitudinal wrapping preparation stage of this solution, the width and quantity of the strip are determined based on the core size, and the dimensional parameters of the guiding component for guiding the strip are further selected, enabling the strip to be accurately and stably mounted on the surface of the cable along the axial direction, effectively avoiding problems such as missing wrapping and wrinkles caused by improper strip width.

[0088] During longitudinal wrapping, according to the cable specifications and strip conditions, by changing the cable traction speed and the gap between the circular ring components in the guiding component, the tight overlapping degree between the strips can be accurately controlled, achieving a reliable match between the strip and the cable, improving the longitudinal wrapping quality, and addressing the problem of mismatch between the width and quantity of the strip and the cable circumference.

[0089] It can adapt to the longitudinal wrapping requirements of different specifications of cables and strips, significantly improve the longitudinal wrapping efficiency, reduce material losses, and reduce the phenomenon of missing wrapping.

[0090] Example 2:

[0091] Taking the longitudinal wrapping of non-woven fabric after the armoring of a cable with the model ZC-YJV23-8.7 / 10kV-3*120 as an example, the method for longitudinal wrapping of non-metallic strips of cables provided in this example includes the following steps:

[0092] Preparation work: Determine the outer diameter and circumference of the cable to be longitudinally wrapped. The measured circumference Ф after armoring is 284.9 mm. In this example, a white non-woven fabric with a width d of 60 mm and a thickness L 厚 of 0.2 mm is selected. Through the formula Ф = πD = nd (n is the number of strips, d is the width of the strip, in mm), the number of strips n ≈ 4.74 is calculated, and 5 strips are taken. And through the formulas:

[0093] Ф 外圆 =(D + 100)*π, Ф 内圆 =(D + 30)*π, θ = 360*d / ((Ф 外圆 / 2π)-10), L 弧长 =1.05*d, L 宽 =13.5*L 厚 , the parameters of the circular ring components are calculated as follows:

[0094] Ф 外圆 is 599 mm, Ф 内圆 is 379 mm, L 弧长 is 63 mm, L 宽 is 5.2 mm.

[0095] Strip threading: Pass 5 non-woven fabrics through the arc-shaped holes of the ring piece respectively, and set a wire coil 100 mm away from the center axis of the ring at the outlet side of the ring piece. Through the formula: D 金属丝 = D + (100 ± 10) mm, calculate the diameter of the wire coil to be 196 mm to ensure that the strip forms a cylinder quickly after being led out through the pores.

[0096] Traction and fixation: Check the coating effect, wrap the strip on the surface of the cable, and bond and fix it with high-temperature resistant tape.

[0097] Longitudinal wrapping process: When the cable passes through the cable hole of the guiding component at a speed of 8.5 m / min, the strip is evenly led out from the arc-shaped hole. Due to the matching of the arc length and the cable circumference, seamless lap joint is achieved, and the coverage rate reaches 100%.

[0098] Verification of effect: After dynamic adjustment, the strip is evenly wrapped on the surface of the cable, and the probability of missing wrapping is reduced to 0.05%.

[0099] Example 3:

[0100] Taking the longitudinal wrapping of non-metallic strip on the armored ZC-YJV23-26 / 35kV-3*400 cable as an example, the longitudinal wrapping method of the cable non-metallic strip provided in this example includes the following steps:

[0101] Preparation work: Determine the outer diameter and circumference of the cable to be longitudinally wrapped. The measured circumference Ф after armoring is 398.5 mm. In this example, a white non-woven fabric with a width d of 60 mm and a thickness L 厚 of 0.2 mm is selected. Through the formula Ф = πD = nd (n is the number of strips, d is the width of the strip, in mm), calculate the number of strips n ≈ 6.64, take 7 strips, and through the formula:

[0102] Ф 外圆 = (D + 100) * π, Ф 内圆 = (D + 30) * π, θ = 360 * d / ((Ф 外圆 / 2π) - 10), L 弧长 = 1.05 * d, L 宽 = 13.5 * L 厚 , calculate the parameters of the ring piece as follows:

[0103] Ф 外圆 is 712 mm, Ф 内圆 is 493 mm, L 弧长 is 63 mm, L 宽 is 5.2 mm.

[0104] Strip threading: Pass 7 non-woven fabrics through the arc-shaped holes of the ring piece respectively, and set a wire coil 100 mm away from the center axis of the ring at the outlet side of the ring piece. Through the formula: D金属丝 = D + (100 ± 10) mm. The diameter of the wire coil is calculated to be 231.9 mm to ensure that the strip forms a cylinder quickly after being led out through the pore.

[0105] Traction and fixation: Check the covering effect, wrap the strip on the surface of the cable, and fix it by bonding with high-temperature resistant tape.

[0106] Longitudinal wrapping process: When the cable passes through the cable hole of the guiding component at a speed of 5 m / min, the strip is evenly led out from the arc-shaped hole. Due to the matching of the arc length and the cable circumference, seamless lap joint is achieved with a coverage rate of 100%.

[0107] Verification of effect: After dynamic adjustment, the strip is evenly wrapped on the surface of the cable, and the probability of uncovered situation is reduced to 0.05%.

[0108] Example 4:

[0109] Taking the longitudinal wrapping of polypropylene strip on the armored ZC-YJV23 - 26 / 35 kV - 3*400 cable as an example, the method for longitudinal wrapping of non-metallic strip on the cable provided in this example includes the following steps:

[0110] Preparation work: Determine the outer diameter and circumference of the cable to be longitudinally wrapped. The measured circumference Ф after armor is 397.8 mm. In this example, a polypropylene strip with a width d of 50 mm and a thickness L 厚 of 0.08 mm is selected. Through the formula Ф = πD = nd (n is the number of strips, d is the width of the strip, in mm), the number of strips n is calculated to be approximately 7.96, and 8 strips are taken. And through the formulas:

[0111] Ф 外圆 =(D + 100)*π, Ф 内圆 =(D + 30)*π, θ = 360*d / ((Ф 外圆 / 2π) - 10), L 弧长 = 1.05*d, L 宽 = 13.5*L 厚 , the parameters of the ring part are calculated as follows:

[0112] Ф 外圆 is 712 mm, Ф 内圆 is 492 mm, L 弧长 is 52.5 mm, L 宽 is 1.08 mm.

[0113] Strip threading: Pass 8 non-woven fabrics through the arc-shaped holes of the ring part respectively. Add polytetrafluoroethylene tape in the pores for lubricating covering to prevent frictional scratching of the longitudinally wrapped strip. And set a wire coil at a distance of 100 mm from the center axis of the ring part on the outlet side of the ring part. Through the formula: D 金属丝= D + (100 ± 10) mm, the diameter of the wire coil is calculated to be 231.6 mm, ensuring that the strip forms a cylinder quickly after being led out through the pores.

[0114] Traction and fixation: Check the coating effect, wrap the strip around the surface of the cable, and fix it by bonding with high-temperature resistant tape.

[0115] Longitudinal wrapping process: When the cable passes through the inner hole at a speed of 5 m / min, the strip is evenly led out from the arc-shaped hole. Due to the matching of the arc length and the cable circumference, seamless lap joint is achieved, and the coverage rate reaches 100%.

[0116] Verification of effect: After dynamic adjustment, the strip is evenly coated on the surface of the cable, and the probability of missing coating is reduced to 0.06%.

[0117] Embodiment 5:

[0118] A longitudinal wrapping device for non-metallic strips of cables, including a strip unwinding device, a guiding component, a forming ring, and a cable traction device. The cable to be longitudinally wrapped passes through the guiding component and the forming ring in sequence and enters the cable traction device, and moves along the axial direction driven by the cable traction device; the strip unwinding device leads out the strip to be longitudinally wrapped and fixes it on the surface of the cable, and passes through the guiding component and the forming ring in sequence driven by the cable, and is coated on the outer layer of the cable;

[0119] Among them, the guiding component includes multiple groups of circular ring parts arranged concentrically. Each group of circular ring parts has a plurality of arc-shaped holes evenly distributed in the circumferential direction, and each arc-shaped hole is used for the corresponding strip to pass through.

[0120] In the preparation stage of longitudinal wrapping, the width and quantity of the strip are determined in advance according to the core size, and the dimensional parameters of the guiding component for guiding the strip are further selected, so that the strip can be accurately and stably carried on the surface of the cable along the axis, effectively avoiding the problems of missing coating and wrinkles caused by improper strip width.

[0121] During longitudinal wrapping, according to the cable specifications and strip conditions, by changing the cable traction speed and the gap between the circular ring parts in the guiding component, the tight lap joint degree between the strips can be accurately controlled, realizing the reliable matching between the strip and the cable, improving the longitudinal wrapping quality, and coping with the problem of mismatch between the width and quantity of the strip and the cable circumference.

[0122] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for longitudinally wrapping a non-metallic cable strip, characterized in that: The following steps are involved: According to the core diameter and circumference of the cable to be longitudinally wrapped, the number of strips, the circumferential distribution angle of the strips on the surface of the core, and the arc length and arc width formed by the strips during longitudinal wrapping are determined, and the size of the circular ring required to guide the strips is further determined; wherein the size of the circular ring includes the outer and inner circumferences of the circular ring, and the arc length and width of the arc hole in the circular ring for guiding the strips; The strip to be longitudinally wrapped passes through the corresponding arc holes in the circular ring in sequence, and after passing through the forming ring, it is fixed on the surface of the wire core; By adjusting the diameter of the circular ring, the oblique straight line distance from the arc hole to the surface of the wire core is controlled; When the strip passing through the arc-shaped hole can closely fit the surface of the wire core without wrinkles, the wire core is pulled to perform longitudinal wrapping to obtain a longitudinally wrapped cable.

2. A method for longitudinally wrapping a non-metallic cable strip as claimed in claim 1, characterized in that: According to the core diameter and circumference of the cable to be longitudinally wrapped, determine the number of strips and the circumferential distribution angle of the strips on the surface of the core, as shown in the following formula: Ф=πD=nd; θ=360*d / ((Φ 外圆 / 2π)-10); Among them, n is the number of strips, d is the strip width, D is the core diameter, Ф is the core circumference, θ is the strip circumferential distribution angle, Ф 外圆 , Ф 内圆 They are respectively the outer and inner circumferences of the circular ring.

3. A method for longitudinally wrapping a non-metallic cable strip as claimed in claim 1, characterized in that: Determine the size of the ring required to guide the strip as shown below: F 外圆 =(D+100)*π; F 内圆 =(D+30)*π; L 弧长 =1.05*d; L 宽 =13.5*L 厚 ; Among them, L 弧长 The arc length of the arc hole required to fix the strip, L 厚 is the strip thickness, L 宽 The width of the arc hole required to fix the strip, Ф 外圆 , Ф 内圆 They are respectively the outer and inner circumferences of the circular ring.

4. A method for longitudinally wrapping a non-metallic cable strip as claimed in claim 1, characterized in that: There is at least one group of circular rings, and the groups of circular rings are arranged in a circle from small to large according to the difference in inner diameters. A cable hole is formed on the inner side of the circular ring with the smallest diameter for passing the wire core.

5. A method for longitudinally wrapping a non-metallic cable strip as claimed in claim 1, characterized in that: The circular ring has a plurality of arc-shaped holes evenly distributed in the circumferential direction, and each arc-shaped hole is used for a corresponding strip to pass through.

6. A method for longitudinally wrapping a non-metallic cable strip as claimed in claim 1, characterized in that: When the strip to be longitudinally wrapped has multiple layers, the diameter of the circular ring pieces corresponding to each layer of the strip is different, and multiple groups of circular ring pieces are combined to form a guide assembly.

7. A method for longitudinally wrapping a non-metallic cable strip as claimed in claim 1, characterized in that: The diameter of the forming ring is as follows: D 成型圈 =D+(100±10); Among them, D 成型圈 is the diameter of the forming ring, and D is the wire core diameter.

8. A method for longitudinally wrapping a non-metallic cable strip as claimed in claim 1, characterized in that: When the strips are overlapped and wrapped longitudinally, the parameters of the overlapping area are as follows: i 重叠 =(θ / d)*L 重叠 ; Among them, θ 重叠 is the angle of the overlapping area, L 重叠 is the width of the overlapping area.

9. A method for longitudinally wrapping a non-metallic cable strip as claimed in claim 1, characterized in that: During the longitudinal wrapping process, when the number of strips changes, the circular rings with the corresponding number of arc holes are replaced and the width of the arc holes is re-determined, as shown in the following formula: W = k*w + Δ; Among them, W is the re-determined arc hole width, w is the strip width, k is the margin coefficient, and Δ is the tolerance compensation value.

10. A device for longitudinally wrapping a non-metallic cable strip, used to implement the method for longitudinally wrapping a non-metallic cable strip according to any one of claims 1 to 9, characterized in that: It includes a strip pay-off device, a guide assembly, a forming ring and a cable pulling device. The cable to be longitudinally wrapped passes through the guide assembly and the forming ring in turn and enters the cable pulling device, and moves along the axial direction driven by the cable pulling device; the strip pay-off device leads out the strip to be longitudinally wrapped and fixes it on the surface of the cable, and passes through the guide assembly and the forming ring in turn driven by the cable, and is wrapped on the outer layer of the cable; The guide assembly includes a plurality of groups of concentrically arranged circular rings, each group of circular rings has a plurality of evenly distributed arc holes in the circumferential direction, and each arc hole is used for a corresponding strip to pass through.

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