阅读说明：本技术 轻型复合材料杆塔的制造工艺、芯模及轻型复合材料杆塔 (Manufacturing process of light composite material tower, core mold and light composite material tower ) 是由 周开河 高明 王猛 钟维军 白文博 管金胜 朱艳伟 钱锡颖 金坤鹏 但扬清 于 2020-12-07 设计创作，主要内容包括：本发明公开了一种轻型复合材料杆塔的制造工艺、芯模及轻型复合材料杆塔,通过采用中空的芯模以及其内侧的蒸汽管道通入蒸汽,实现对复合材料抢修杆在生产过程中进行内加热,并通过边缠绕边固化的方法进行抢修杆生产制造,本发明抢修杆内结构层、中防护层以及外防护层的结构设计可以很好的保证抢修杆的强度、寿命以及使用效果,并对生产过程中的工艺参数比如缠绕角度、铺层厚度、铺层层数、缠绕张力、缠绕切点等进行研究,保证抢修杆的质量,该方法生产抢修杆效率高,强度大,便于运输、安装以及维修,可以对电力故障进行快速响应,避免重大损失。该轻型复合材料杆塔具有高强度的同时,具有良好的抗紫外线以及抗腐蚀性能。(The invention discloses a manufacturing process of a light composite material tower, a core mould and the light composite material tower, wherein steam is introduced into a hollow core mould and a steam pipeline on the inner side of the hollow core mould, so that the composite material rush-repair rod is internally heated in the production process, and the rush-repair rod is produced and manufactured by a method of winding and curing. The light composite material tower has high strength and good ultraviolet resistance and corrosion resistance.)

1. The manufacturing process of the light composite material tower is characterized by comprising the following steps;

s1; preparing a mould, and coating a release agent on the outer surface of the mould;

s2; manufacturing an inner structure layer, internally heating the mould, and winding and curing the inner structure layer on the outer surface of the mould;

s3; manufacturing a middle protective layer, and winding and curing the middle protective layer on the outer side of the inner structural layer in the S2 after the inner structural layer in the S2 is semi-cured;

s4; manufacturing an outer anti-slip layer, and performing sand blasting treatment on the outer edge surfaces of the wound inner structural layer and the middle protective layer;

s5; and integrally curing, demolding and cutting to form a finished product.

2. The process of manufacturing a lightweight composite tower as claimed in claim 1, wherein the internal heating in step S2 is steam heating, and the surface of the mold is heated by introducing high temperature steam into the mold.

3. The manufacturing process of the light composite material tower as claimed in claim 1, wherein the inner structure layer is made of carbon fiber composite material by winding, and a mixture of resin and curing agent is infiltrated during winding, so that the winding and curing of the inner structure layer are synchronously carried out; the middle protective layer is formed by winding glass fiber composite materials, and a mixture of resin and a curing agent is soaked during winding, so that the winding and curing of the middle protective layer are synchronously carried out.

4. The manufacturing process of the light composite material tower as claimed in claim 3, wherein the inner structural layer is alternately paved with +/-15 degrees of paving layers and 90 degrees of paving layers in the paving process, and the thickness of the paving layers is 6-8 mm.

5. The process for manufacturing the light composite material tower as claimed in claim 3, wherein the thickness of the middle protective layer is 1.2 mm-1.5 mm.

6. The manufacturing process of the light composite material tower as claimed in claim 1, wherein the outer anti-slip layer is formed by spraying quartz sand on the surface of the whole rod body of the rush repair rod immediately after the winding of the middle protective layer is finished and before the resin is cured, and the spraying thickness is not less than 0.5 mm.

7. A core mould is applied to the manufacturing process of the light composite material tower disclosed by any one of claims 1-7, and is characterized by comprising a hollow cylindrical core shaft, wherein a steam pipeline coaxial with the core shaft is arranged at the central part in the core shaft, and a plurality of air outlet holes distributed along the axial direction are formed in the side wall of the steam pipeline.

8. The mandrel of claim 7, wherein the mandrel has a tapered outer surface, the mandrel has a rotating head at a head end thereof, the rotating head has a steam inlet communicating with a steam pipeline and a condensate outlet communicating with the outside, and the mandrel has a tail support at a tail end thereof.

9. The mandrel of claim 7 wherein the mandrel is provided with a grate ring at each end for facilitating small angle roping.

10. A light composite material tower is characterized in that: the anti-skid core mold comprises an inner structure layer, a middle protective layer and an outer anti-skid layer, wherein the inner structure layer is formed by winding a carbon fiber composite material on the outer surface of a conical core mold and curing the carbon fiber composite material through a mixture of impregnating resin and a curing agent, the middle protective layer is formed by winding a glass fiber composite material on the outer surface of the inner structure layer and curing the glass fiber composite material through a mixture of impregnating resin and a curing agent, and the outer anti-skid layer is formed by sand blasting the outer edge surface.

Technical Field

The invention belongs to the technical field of production of electric power rush-repair equipment, and particularly relates to a light composite material tower.

Background

A power grid structure taking 500KV as a backbone except northwest areas is formed nationwide, and intra-area and inter-area power grid interconnection is realized. With the rapid development of national economy, the nation puts forward higher requirements on the power industry. Particularly, under the circumstances of environmental deterioration, resource shortage, and energy crisis, the weight reduction technology of electric power equipment is becoming a trend of the power industry, and higher demands are made on weight reduction materials.

China is vast in territory, the route passes through the area, not only is the geological structure complex, and the meteorology is also quite complex, and natural disasters such as freezing, typhoon, mountain landslide and debris flow are easy to occur, and the natural disasters are easy to cause accidents such as line tower falling, pole breakage and the like. In the Shanghai region, particularly Ningbo landform mainly comprises mountains and hills, belongs to the climate region of subtropical monsoon, the latitude is affected by the intersection of cold and warm air masses, and the mountains lean to the sea, the weather is variable due to specific geographical positions and natural environment, the difference is obvious, the disastrous weather is relatively frequent, the phenomena of mud-rock flow, typhoon, coastal corrosion, freezing rain, snowstorm and the like which often occur seriously damage the electric pole tower, the safe and stable operation of the power grid is affected, and the serious economic loss is brought. When accidents such as pole breakage, power interruption and the like are caused after disasters, metal pole towers are mostly adopted in conventional emergency repair, and the metal structure emergency repair pole towers have the problems of large size, heavy weight, difficulty in transportation and installation and the like, so that the emergency repair speed of a power line is seriously delayed, and secondary economic loss after disasters is caused. In recent years, tower collapse and pole breakage accidents frequently occur, for example, tower collapse occurs due to invasion of tornadoes and rainstorm to 10 KV high-voltage transmission towers in Dehui city of Jilin province in 2000; tower of No. 130 tower of 330KV Longnitralan line on a certain mountain in Guide county of Qinghai province in 2005 falls down due to strong wind; multiple power transmission lines of the Hunan power grid in the same year fall over due to ice coating; particularly, in 2008, 1 month to 2 months, the power grid is subjected to a serious low-temperature rain and snow freezing disaster in 50 years in parts of southern China, so that a huge disaster is caused. The damage of the power transmission and transformation equipment is serious due to the ice coating tower falling and line breaking accidents in provinces and cities such as Hunan, Guizhou, Jiangxi, Zhejiang and Fujian, as shown in figure 1. According to statistics, the national grid company system only has 2018, due to icing, 17.2 million bases of high-voltage lines are inverted, 1.2 million bases are damaged, 51.9 million bases of low-voltage lines are inverted, 15.3 million bases are damaged, a transformer substation stops running for 884 seats, direct economic loss reaches $ 15.2 billion, electric energy sales loss reaches $ 7.4 billion, and restoration and reconstruction investment costs $ 56.8 billion. Therefore, the universality and the severity of natural disasters bring great development opportunities to the timeliness of emergency repair and the light-weight technology of emergency repair equipment in the power industry.

When the tower collapse and pole breakage accidents occur in the power transmission of the distribution network, if the time consumption for rush repair of the circuit is long according to the original design standard, serious influence and threat are brought to the safe and stable operation and the power supply of a power system, serious economic loss is caused, and great influence is brought to the life, production and social activities of people. In this case, the primary task is to prop up the transmission line at the fastest speed and immediately restore the power supply, minimizing losses and impacts becoming a critical issue for the power sector.

At present, electric poles used in overhead power transmission lines at home and abroad are mainly steel poles and concrete poles. The traditional electric pole has the defects of large mass, easy decay, corrosion or cracking and the like, the service life is short, the construction, transportation and operation maintenance are difficult, and accidents such as circuit tower falling and line breaking are easily caused. With the development of material technology, resin and fiber composite materials are continuously advanced in material and production technology, and composite materials with the advantages of light weight, high strength, impact resistance, fatigue damage resistance, strong designability and the like become the mainstream trend of light weight technologies in various industries. The quality of the portable distribution network composite emergency repair pole tower is about 1/3 of a wooden pole, 1/10 of a concrete pole and 1/2 of a steel pole, so that the transportation and construction installation cost can be greatly reduced, the fault emergency repair time can be greatly shortened especially in mountain forests and remote areas where people are difficult to reach, the power transmission can be recovered immediately, the emergency repair timeliness of a distribution network line after a disaster can be obviously improved, and meanwhile, the composite emergency repair pole tower and the cross arm have the characteristics of being good in antifouling, anti-corrosion and anti-aging performance and the like, and have become the main development trend of domestic and external pole towers and cross arm technologies.

Disclosure of Invention

The invention aims to provide a manufacturing process and a core mold of a light composite material tower, and aims to solve the problems that in the prior art, a rush repair rod is heavy in weight, inconvenient to transport and maintain and incapable of quickly responding to power faults, so that the loss is overlarge.

Firstly, the invention provides a manufacturing process of a light composite material tower; comprises the following steps of;

s1; preparing a mould, and coating a release agent on the outer surface of the mould;

s2; manufacturing an inner structure layer, internally heating the mould, and winding and curing the inner structure layer on the outer surface of the mould;

s3; manufacturing a middle protective layer, and winding and curing the middle protective layer on the outer side of the inner structure layer in the S2 after the inner structure in the S2 is semi-cured;

s4; manufacturing an outer anti-slip layer, and carrying out sand blasting treatment on the outer edge surfaces of the wound inner structural layer and the middle protective layer;

s5; and integrally curing, demolding and cutting to form a finished product.

Preferably, the internal heating manner in step S2 is steam heating, and the surface of the mold is heated by introducing high-temperature steam into the mold.

Preferably, the inner structure layer is made of carbon fiber composite materials in a winding mode, and a mixture of resin and a curing agent is soaked in the inner structure layer in the winding process, so that the inner structure layer is wound and cured synchronously.

Preferably, +/-15-degree paving layers and 90-degree paving layers are alternately paved on the inner structure layer in the paving process, and the thickness of the paving layers is 4-8 mm.

Preferably, the middle protective layer is formed by winding a glass fiber composite material, and a mixture of resin and a curing agent is soaked during winding, so that the winding and curing of the middle protective layer are synchronously performed.

Preferably, the thickness of the middle protective layer is 1.2 mm-1.5 mm.

Preferably, the outer anti-slip layer is formed by immediately spraying quartz sand on the surface of the whole rod body of the rush repair rod after the middle protective layer is wound and before resin is cured, wherein the spraying thickness is not less than 0.5 mm.

The invention further provides a core mould applied to the manufacturing process of the light composite material tower, in order to better realize the manufacturing process of the composite material tower, the core mould comprises a mandrel with a hollow barrel shape, a steam pipeline coaxial with the mandrel is arranged at the central part inside the mandrel, and a plurality of air outlet holes distributed along the axial direction are formed in the side wall of the steam pipeline.

Preferably, the outer surface of the mandrel is of a conical structure, a rotating head is arranged at the head end of the mandrel, a steam inlet communicated with a steam pipeline and a condensate outlet communicated with the outside are arranged on the rotating head, and a tail support is arranged at the tail end of the mandrel.

Preferably, both ends of the mandrel are provided with comb tooth rings for facilitating small-angle yarn hanging.

The invention can manufacture a composite material rush-repair rod with a three-layer structure, which respectively comprises an inner structural layer (a main stress component which needs to have high strength and high modulus) formed by winding carbon fiber composite materials, a middle protective layer (used for protecting the inner structural layer and needing high heat resistance, corrosion resistance and other properties) formed by winding glass fibers, and an outer anti-skid layer (used for avoiding the rod climbing to slip and facilitating the transportation, installation and maintenance) sprayed by quartz stones.

When concrete production is made, twine through the mode that adopts heating in the mould inner structure layer and outer inoxidizing coating, carry out the curing agent in winding process kind in addition in step and add, realize the while winding solidification, this kind of technique has following advantage for traditional outer solidification technology: (1) the intermediate processes of disassembly, transfer and installation are omitted, so that the hot winding obviously has higher forming efficiency; (2) the flowing speed of high-temperature and high-pressure steam is high, and the heat transfer efficiency of the metal core mold is high, so that the energy efficiency in the processing process can be improved; (3) the winding and curing are carried out simultaneously, and the composite material rush-repair rod can be formed layer by layer, so that bubbles generated in the curing reaction process can be discharged in time, resin flowing and material compaction are facilitated, and the formed composite material rush-repair rod has better quality and performance; in the specific winding process, the winding angle, the winding direction, the thickness of the paving layer and the like are limited, so that the performance of the material can be fully utilized, and higher strength and longer service life can be achieved.

In addition, the structure of the core mould is set to realize the effect of curing while winding, and the core mould can be conveniently rotated by adding a rotating head at the end of the core mould, meanwhile, through the hollow structure design of the mandrel and the design of the steam pipeline inside the mandrel, can conveniently fill high-temperature steam into the mandrel and can be uniformly distributed in the inner cavity of the mandrel, and can uniformly discharge gas to the periphery along the side wall of the steam pipeline along the axial direction of the mandrel, the whole long mandrel can be heated uniformly, better curing effect is realized, meanwhile, the head of the mandrel is provided with a condensed water outlet, the water vapor liquefied by cold can be well discharged, and simultaneously, in the specific winding process, in order to ensure the strength of the inner structure layer, a smaller winding angle needs to be ensured, but the winding line type of the end part of the core mould is unstable due to the small-angle winding process; in order to solve the problem, the multi-tooth grate rings are designed at two ends of the core die, when a yarn belt runs to one end of the core die along with a trolley, the multi-tooth grate rings realize a yarn hanging function, the structure improves fiber winding sliding lines under small-angle winding, reduces material loss, and shortens the retention time of the trolley at the end part.

The invention also discloses a light composite material tower, which is characterized in that: the anti-skid composite core mold comprises an inner structure layer, a middle protective layer and an outer anti-skid layer, wherein the inner structure layer is formed by winding a carbon fiber composite material on the outer surface of a conical core mold and curing the carbon fiber composite material through a mixture of impregnating resin and a curing agent, the middle protective layer is formed by winding a glass fiber composite material on the outer surface of the inner structure layer and curing the glass fiber composite material through a mixture of impregnating resin and a curing agent, and the outer anti-skid layer is formed by sand blasting the outer edge surface of the middle.

In summary, the technical scheme of the invention at least has the following beneficial effects:

1. the method can produce the light composite material rush-repair rod with a three-layer structure, the product has light weight, the structural strength can meet the requirement, and the quick response in the power failure maintenance process can be realized;

2. the inner structure layer and the middle protective layer are wound and cured simultaneously in an internal heating mode, so that the product quality can be effectively improved, and the working efficiency can be improved;

3. the three layers of different structures can ensure that the product has high strength, good ultraviolet resistance and corrosion resistance, and is convenient to install, transport and climb, and can avoid slipping;

4. in specific production process, through designing different winding modes and additionally arranging auxiliary winding tools such as a comb tooth ring, the production efficiency can be effectively improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of the manufacturing process of the present invention;

fig. 2 is a schematic view of a core mold structure of the present invention;

FIG. 3 is a schematic view of the flow of the gas stream after the steam is introduced by internal heating according to the present invention;

FIG. 4 is a graph of core deflection change, a cloud of core deflection change, and a graph of core deflection change along length in accordance with the present invention;

FIG. 5 is a graph showing deflection value, stress value and failure parameter of the rush-repair rod varying with the angle of the fiber layer when the load of the present invention is 6 kN;

FIG. 6 is a graph showing deflection value, stress value and failure parameter of the rush repair rod varying with the thickness of the fiber layer when the load of the present invention is 6 kN;

FIG. 7 is a graph showing the decreasing proportion of the maximum deflection value and the maximum stress value of the layer thickness of the rush-repair rod when the load of the present invention is 6 kN;

figure 8 is a small angle winding apparatus angle (two end grated ring) of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

As shown in fig. 1-8; the length of the rush-repair rod can be different in the production and use processes of the rush-repair rod, but the required length of the rush-repair rod is 12m under the general condition, the production and manufacturing process of the rush-repair rod made of composite materials is further explained by taking the rush-repair rod with the length of 12m as an example, and the rush-repair rod is a conical structure with the diameter of the top end smaller than the diameter of the root part based on the length of the main body of the rush-repair rod in the actual process, wherein the top diameter is phi 190mm, and the root diameter is phi 350 mm; when the core mould is manufactured, the size of the core mould is designed into a conical connection structure with the total length of 12992mm by considering the initial set value of the wall thickness of the rush repair rod, namely a shaft head phi 155mm of the core mould, a shaft tail phi 327mm and a tail supporting and transitional connecting section, as shown in figure 2.

In order to enable the core mould to be recycled, the core mould is made of a metal material, the core mould can generate certain deflection under the condition of self-weight load in the actual production process of the overlong core mould, steel which is large in modulus and not easy to deform is selected as the core mould material in order to reduce the influence of the deflection value of the core mould on the quality of the winding-formed rush repair rod, the core mould made of the steel can be obtained according to finite element modeling analysis, the maximum deflection value of the core mould is 3.5mm under the conditions of simple support type constraint and self-weight load, and the influence on the quality of the rush repair rod can be ignored, and as shown in figure 4, a core mould deflection change graph, a core mould deflection change cloud graph and a core mould deflection change graph along the length can be.

In order to realize the internal heating on-line curing of the core mold, the middle part of the core mold is a hollow cylinder; a steam pipeline 2 coaxial with the mandrel 1 is arranged in the steam pipe, one end of the steam pipeline 2 is closed, the other end of the steam pipeline is open, and the open end is used for introducing steam; the steam pipeline 2 is provided with four uniform air outlets 3 at several fixed positions along the axial direction; the inlet end of the steam pipeline is provided with a steam inlet 4 and a condensed water outlet 5 communicated with the outside; for the discharge of steam and condensed water; as shown in fig. 3.

In order to realize winding in the production process and better rotation of the core mold, the head end of the mandrel 1 is provided with a rotating head 6, and the tail end of the mandrel 1 is provided with a tail support 7.

The manufacturing process of the composite material rush-repair rod adopts the core mould to manufacture, mainly applies an internal heating curing heating method to perform the winding and curing of the inner structure layer and the middle protective layer of the rush-repair rod, and concretely, as shown in figure 1, the manufacturing process comprises the following steps;

s1; preparing a mould, and coating a release agent on the outer surface of the mould (facilitating subsequent demoulding);

s2; manufacturing an inner structure layer, internally heating the mould, and winding and curing the inner structure layer on the outer surface of the mould;

s3; manufacturing a middle protective layer, and winding and curing the middle protective layer on the outer side of the inner structural layer in the S2 after the inner structural layer in the S2 is semi-cured;

s4; manufacturing an outer anti-slip layer, and carrying out sand blasting treatment on the outer edge surfaces of the wound inner structural layer and the middle protective layer;

s5; and integrally curing, demolding and cutting to form a finished product.

The internal heating mode in the step S2 is steam heating, and high-temperature steam is introduced into the steam pipeline 2 in the mould to uniformly heat the surface of the mould; because the air outlet holes 3 are formed in the side wall of the steam pipeline along the circumference in the axially spaced distribution mode, steam can be uniformly distributed in the inner cavity of the mandrel 1, uniform heating is realized, and a better curing effect is realized.

In order to ensure the strength of the inner structure layer, the inner structure layer is wound by adopting a carbon fiber composite material when materials are selected, the inner structure layer is solidified by matching with resin casting to ensure good strength and modulus, in addition, a curing agent is doped when the resin is cast, the winding and solidification of the inner structure layer are synchronously carried out by matching with a heating technology, and the working efficiency can be effectively improved

However, although the carbon fiber composite material has small density, high strength and modulus, especially the elastic modulus is about 2.5 times higher than that of the glass fiber, and has excellent durability such as creep deformation and fatigue resistance, and long service life, the carbon fiber composite material has obvious defects, such as large brittleness, large impact strength and easy fragmentation, and is easy to rub and collide during the transportation and installation processes when being stuck to a composite material rush repair rod, and even a worker can hardly avoid the collision phenomenon of sharp stones and steel chisels on the composite material rush repair rod when the upright rod is used for filling earth stones; in order to better prolong the service life of the rush repair rod, a middle protective layer is designed on the outer part of an inner structural layer, the middle protective layer is formed by winding glass fiber composite materials, and a mixture of resin and curing agent is soaked during winding, so that the winding and curing of the middle protective layer are synchronously carried out; the protective layer can resist ultraviolet rays and corrosion aging-resistant layers and protect the rush-repair rod, namely, after the winding of the inner structural layer is finished, the glass fiber ring impregnated with the aging-resistant aliphatic two-component polyurethane is wound for two layers; the total thickness of the middle protective layer is 1.2 mm-1.5 mm, and the surface layer has more than 65% of glass fiber content, so that the scratch and abrasion resistance of the surface layer can be greatly improved.

In addition because in well inoxidizing coating winding completion solidification back, because its material characteristic, salvage pole surface is more smooth, make light-duty material salvage pole in the transportation, the installation, in the maintenance process, the pole of climbing skids easily, simultaneously inconvenient pole setting, consequently, the outer skid resistant course of one deck has been made in the outside special design of well inoxidizing coating, carry out sand blasting treatment to salvageing the pole promptly, after well inoxidizing coating winding, before the resin solidification, to salvageing the whole pole body surface coating quartz sand of pole immediately, thickness is not less than 0.5 mm.

Through the method for heating, winding and combining synchronous curing, compared with the traditional external curing process, the method has the following advantages that: (1) the intermediate processes of disassembly, transfer and installation are omitted, so that the hot winding obviously has higher forming efficiency; (2) the flowing speed of high-temperature and high-pressure steam is high, and the heat transfer efficiency of the metal core mold is high, so that the energy efficiency in the processing process can be improved; (3) because winding and curing are carried out synchronously, the composite material rush-repair rod can realize layer-by-layer molding, so that bubbles generated in the curing reaction process can be discharged in time, resin flowing and material compaction are facilitated, and the molded composite material rush-repair rod has better quality and performance; in addition, the design of the three-layer structure of the rush-repair rod enables the rush-repair rod to have the characteristics of good strength, corrosion resistance, easiness in installation and maintenance and the like, and the rush-repair rod has a longer service life.

The strength of the inner structural layer is the greatest importance of the quality of the whole rush-repair rod, the inner structural layer needs to be further researched in order to ensure better strength of the rush-repair rod, the inner structural layer is manufactured by adopting a method for improving the strength as much as possible, and when the rush-repair rod is produced in a winding mode, factors influencing the structural strength mainly comprise a winding angle, the number of layers, the thickness of the layers of layers and the like.

Firstly, the winding angle is considered, the difference of the winding angles can influence the deflection value, the stress value and the failure parameter of the emergency repair pole, and the proper laying angle needs to be comprehensively considered and selected. Theoretically, the closer the layer angle is to 0 degree, the smaller the deflection value of the rush-repair rod under the working condition of service is, the specific change curve is shown in figure 5, when the load is 6kN, the curve of the maximum deflection value of the rush-repair rod changing along with the difference of the fiber layer angle shows that when the fiber angle is less than 20 degrees, the increase of the maximum deflection value along with the increase of the fiber angle is not obvious.

As shown in fig. 5, when the load is 6kN, the maximum stress value of the rush-repair rod changes with the difference of the fiber lay-up angles, and it can be seen that when the rush-repair rod bears the load of 6kN, the maximum stress value of the root position changes with the change of the lay-up angle from 0 degree to 90 degrees. An increase in the fiber angle results in an increase in the maximum stress value when the fiber angle is less than 45 degrees, and a decrease when the fiber angle is greater than 45 degrees, the maximum stress value having a maximum value when the fiber angle is 45 degrees. This is because the axial stress depends on the axial component of the stiffness matrix, which, in addition to being directly related to the axial properties of the material, is also related to the coupling of the transverse properties of the material to the axial direction, as the fiber angle increases from 0 degrees to 45 degrees, the axial properties decrease, the axial performance-decreasing force increases, as the fiber angle increases from 45 degrees to 90 degrees, the axial properties decrease, the transverse properties-decreasing force decreases, and at 45 degrees, the transverse performance-decreasing force increases most. Thus, the axial stress is greatest at a fiber angle of 45 degrees.

As shown in fig. 5, when the load is 6kN, the failure parameter of the rush-repair rod changes with the difference of the fiber lay-up angles, and it can be seen that when the rush-repair rod bears the load of 6kN, the failure parameter of the rush-repair rod changes with the change of the lay-up angle from 0 degree to 90 degrees. A failure parameter of less than 1 indicates that there is no failure of any of the layers of composite material making up the first-aid repair bar, and a failure parameter of 1 or greater indicates that there is a failure of one of the layers of composite material in all of the plies, which has a reduced load-bearing capacity or is unable to carry any load. The smaller the failure parameter is, the higher the strength of the rush-repair rod made of light materials is, the more difficult the rush-repair rod is to be damaged, and the higher the failure parameter is, the closer the rush-repair rod is to be damaged, the more unsafe the rush-repair rod is. The failure parameter shown in the figure increases rapidly with increasing fiber angle when the fiber angle is greater than 50 degrees, and not significantly with increasing fiber angle when the fiber angle varies between cells.

Analyzing the change graphs of the three factors, comprehensively considering a curve chart of the maximum deflection value, the maximum stress value, the failure parameter and the fiber angle, and the limits of the winding process on the fiber angle, the spread yarn width and the number of winding tangent points, and selecting 15 degrees in a small angle interval of the fiber as a layering angle; in addition, 90-degree fiber layers are added to avoid radial slotting of the rod body, the 90-degree layers can play a role in extruding redundant resin in a subsequent winding and forming manufacturing process, in order to better play the role of the 90-degree fiber layers, the maximum continuous paving layer number is limited, and the co-directional paving layers are not suitable to be continuously paved for more than 4 layers, so that +/-15-degree paving layers and 90-degree paving layers are alternately paved in the paving process of the cross-internal structure layers.

As can be seen in FIG. 6, the relationship of ply thickness to deflection value, stress value and failure parameter is shown for a load of 6 kN; the difference between the results obtained at a ply thickness of 4mm and the results obtained at other ply thicknesses and at a ply thickness of 4mm is the reduction of the maximum deflection and the maximum stress when the ply thickness increases, and the reduction is divided by the corresponding result at a ply thickness of 4mm by the curve in the figure, and the obtained ratio value is taken as the reduction ratio of the corresponding result parameter, as shown in fig. 7. When the thickness of the paving layer is less than 7mm, the maximum deflection and the maximum stress are reduced at a higher speed, the variation trend of the reduction proportion of the maximum deflection and the maximum stress of the rush-repair rod along with the increase of the thickness of the paving layer is reduced rapidly, and when the thickness of the paving layer is more than 7mm, the reduction trend of the maximum deflection and the maximum stress is reduced along with the increase of the thickness of the paving layer.

In summary, considering that the designed ply angle is +/-15 degrees and 90 degrees, and combining the limitation on the thickness of the single-layer small-angle ply and the circumferential ply in the winding process, the thickness of the designed ply in the invention is optimally selected to be 7 mm.

In addition, because the winding angle is set to be small, the mechanical property of the fiber is ensured by adopting a small angle of 9-15 degrees in combination with the process state of the current domestic winding equipment, but the winding line type of the end part of the core mould is unstable due to the small angle winding process and the like. In order to solve the problem, the two ends of the core mould are designed with multi-tooth grid rings, as shown in figure 8; figure 1-mandrel; 8-a grate ring; 9-hanging a yarn plate; 10-a yarn sheet; 11-anti-dangling device.

When the yarn belt moves to one end of the core mold along with the trolley, the grate ring realizes the yarn hanging function, the structure improves the fiber winding sliding line under small-angle winding, reduces the material loss and shortens the retention time of the trolley at the end part. Both ends of the mandrel are provided with comb tooth rings for facilitating small-angle yarn hanging.

In addition, in the actual production process, the influence of other factors such as winding tangent points, winding tension, glue content and the like needs to be considered, for the winding tangent points, the more the number of the tangent points is, the more the fibers are wound on the mandrel, the more the fibers are crossed, the fibers are accumulated at two ends, and stress concentration is possible, so that the linear type with few tangent points is selected. Through practical determination, 3 tangential points can be selected for a round tube with the diameter of 50-100 mm, 8 tangential points can be selected for a round tube with the diameter of 300-400 mm, and 18 tangential points can be selected for a round tube with the diameter of more than 800 mm. As the diameter of the tip part of the core die of the rush-repair rod is phi 155mm, the diameter of the root part of the core die is phi 327mm, and the axial spreading width is 113mm, the number of winding tangent points of the rush-repair rod made of the light material is suitable for selecting 9 points.

For the winding tension, the strength and the modulus of the structural layer of the composite rush repair rod are closely related to the winding tension. Too low winding tension results in low strength of the product, and too high winding tension results in increased loss of strength of the fiber and reduced strength of the product. Meanwhile, the winding tension has a significant influence on the glue content of the composite winding layer. Therefore, the winding tension is suitably selected, and the magnitude thereof is generally 5% to 10% of the fiber strength.

With regard to the control of the glue content, at present, the composite material electric pole adopts a wet winding process. The wet winding is to wind the fiber bundle directly onto the core mold under the control of tension after dipping. The wet winding method has the following advantages: the cost is 40 percent lower than that of dry winding; secondly, the void ratio is low, because the winding tension enables the redundant resin glue solution to extrude out the air bubbles and fill the voids; the fiber arrangement parallelism is good; fourthly, when the fiber is wound by a wet method, the resin glue solution on the fiber can reduce the fiber abrasion; high production efficiency (up to 200 m/min). The disadvantages of wet winding are mainly: firstly, the resin waste is large, and the operation environment is poor; secondly, the content of the glue and the quality of the finished product are not easy to control. In the implementation process of the project, a manual glue scraping method is adopted to extrude the redundant resin.

In conclusion, the three-layer structure of the composite emergency repair rod is manufactured through the corresponding core mold, the manufacturing method of synchronously winding and curing in the internal heating mode is adopted, and the selection of each process parameter in the production process is combined, so that the production efficiency and quality of the emergency repair rod can be effectively ensured, and the problem of serious loss caused by slow repair in the traditional method when an electric power fault occurs is effectively avoided.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.