CN112064383A

CN112064383A - Improved composite material rope structure

Info

Publication number: CN112064383A
Application number: CN202010699020.8A
Authority: CN
Inventors: 林大伟; 肖进; 王棒柱; 许立兵
Original assignee: Fuzhou Dali Industrial Development Co ltd
Current assignee: Fuzhou Dali Industrial Development Co ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2020-12-11

Abstract

The invention relates to a composite rope, in particular to an improved composite rope structure. The invention has the beneficial effects that: according to the improved composite material rope, the reinforcing layer adopts the carbon fibers to reduce the weight of the rope, so that the tensile strength of the rope is improved, and the improved composite material rope is suitable for an elevator with a longer moving distance; the shock resistant layer reduces the vibration noise of the elevator rope in the working process and prolongs the service life of the composite material rope; the surface layer adopts a high-strength wear-resistant layer, so that the capability of the rope for adapting to severe environment is enhanced.

Description

Improved composite material rope structure

Technical Field

The invention relates to a composite rope, in particular to an improved composite rope structure.

Background

There is often a need for a rope structure that is disposed under tension between two objects. The characteristics of a given type of cord structure determine whether such cord structure is suitable for a particular intended use. The properties of the rope structure include breaking strength, elongation, flexibility, weight, and surface properties such as abrasion resistance and coefficient of friction. In addition, environmental factors such as heat, cold, moisture, exposure to UV light, abrasion, bending, etc. may also affect the properties of the strand structure.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects in the prior art and provides an improved composite material rope structure.

The invention is realized by the following technical scheme:

an improved composite material rope structure comprises a center layer, a reinforcing layer, an anti-impact layer, an anti-tearing layer and an anti-wear layer, wherein the center layer comprises a plurality of composite rope strands, the composite rope strands comprise a fiber material and a matrix material, the reinforcing layer is made of carbon fibers, the carbon fibers are coated outside the center layer, the anti-impact layer is coated outside the reinforcing layer, the anti-tearing layer is coated outside the anti-impact layer, and the anti-wear layer is coated outside the anti-tearing layer.

According to the above technical solution, preferably, the fiber material and the matrix material are helically twisted.

According to the technical scheme, preferably, the fiber material is composed of one or more of aramid fiber, polyester fiber, PBO, PBI, basalt, HMPE and ceramic fiber.

According to the above technical solution, preferably, the matrix material is composed of one or more of thermoplastic polyurethane, polyethylene, polypropylene, PVC and nylon.

According to the technical scheme, the anti-tear layer is preferably nylon mesh cloth, and the thickness of the anti-tear layer is 1mm-1.3 mm.

According to the technical scheme, the impact-resistant layer is preferably composed of a polyurethane corrugated belt and natural rubber, and the thickness of the impact-resistant layer is 6mm-8 mm.

According to the technical scheme, the wear-resistant layer is preferably made of wear-resistant epoxy resin and has the thickness of 0.6-8 mm.

According to the above technical solution, preferably, the central layer is provided with a plurality of yarns.

The invention has the beneficial effects that: according to the improved composite material rope, the reinforcing layer adopts the carbon fibers to reduce the weight of the rope and improve the tensile strength of the rope, so that the improved composite material rope is suitable for an elevator with a longer moving distance; the anti-impact layer reduces the vibration noise of the elevator rope in the working process and prolongs the service life of the composite material rope; the surface layer adopts a high-strength wear-resistant layer, so that the capability of the rope for adapting to severe environment is enhanced.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following preferred embodiments.

The invention relates to an improved composite material rope structure which comprises a central layer, a reinforcing layer, an anti-impact layer, an anti-tearing layer and an anti-wear layer, wherein the central layer comprises a plurality of composite rope strands, the composite rope strands comprise a fiber material and a matrix material, the reinforcing layer is made of carbon fibers, the carbon fibers wrap outside the central layer, the anti-impact layer wraps outside the reinforcing layer, the anti-tearing layer wraps outside the anti-impact layer, and the anti-wear layer wraps outside the anti-tearing layer.

The composite rope structure includes a plurality of formed composite strands and a core strand. As perhaps best shown therein, the shaped composite strands are preformed in a generally helical configuration such that a plurality (two or more) of the shaped composite strands combine with the core strand to form a composite rope structure. An exemplary composite rope structure includes six composite strands surrounding a single core strand.

The composition and manufacture of exemplary formed composite strands will now be described in further detail. Depicted in the drawings is an exemplary green body forming system. The blank-forming system includes a plurality of feed rollers, wherein each feed roller contains a length of fiber. For clarity, the exemplary green body forming system illustrates five feed rolls and five fibers. More than five fibers will typically be used, although it is possible to use five or fewer fibers, for example.

The fibers are flexible and can therefore be unwound from the feed rollers and combined into a fiber bundle. An exemplary fiber bundle formed from fibers includes only one set of parallel fibers. As will be described in further detail below, the fiber bundle may be formed by stranding, braiding, or otherwise mechanically winding the fibers as the fiber bundle is formed.

A fiber bundle formed from fibers is fed through a matrix bath and a forming die to obtain an uncured composite green body material. The matrix pool comprises a matrix material surrounding the fibers and forming a matrix between the fibers. In this case, the matrix material is sufficiently fluid to flow between and around the fibers, but sufficiently plastic to retain its shape after passing through the forming die. The matrix pool may be pressurized to facilitate the flow of matrix material between and around the fibers.

The exemplary forming die is further shown forming the uncured composite green body material in a generally cylindrical shape. However, the forming die may be configured to form the substrate into other shapes. For example, the forming die may be configured to form the substrate into a shape that is controlled to achieve desired characteristics of the final composite rope structure as will be described in further detail below.

Referring back to the attached, the uncured composite green body material is processed in a dryer to obtain a processed composite green body material. The treated composite green body material may be cured, partially cured, or uncured. In this case, the treated matrix material can have a plastic or flexible form or can be converted from a plastic form into a rigid form. The exemplary matrix is thus cured around the fibers such that the treated composite green material retains its generally cylindrical form and is substantially straight.

The exemplary treated composite green body material is then fed into a cutter that cuts the treated composite green body material into a composite green body comprising a matrix and fibers. An exemplary composite body is a rigid elongate body that is generally cylindrical, substantially straight, or linear, and has a length that is predetermined by the parameters of the tool. However, if the composite green body material is partially cured or uncured, the composite green body material may be flexible or semi-rigid, in which case the processed composite green body material need not be cut into blanks using a cutter. Rather, the composite green body material may be wound onto a spool or the like for storage and/or further processing as will be described below.

Another exemplary composite rope structure may include composite strands formed from hybrid yarns. The hybrid yarn is composed of a combination of at least two types of high performance yarns, such as carbon fiber yarns, and matrix forming thermoplastic yarns, such as polyethylene yarns. Upon heating, the matrix-forming yarn having the lower melting temperature melts and forms a matrix for the high performance yarn. Following a similar procedure to the impregnated yarn described above, the hybrid yarn is passed through a hot chamber and forming die. When cooled, composite strands are formed.

Referring now to the drawings, depicted therein is a blank stranding system for converting an exemplary composite blank into an unformed composite strand. The green body stranding system includes an anchor assembly, a stranding assembly, and a heating assembly. Specifically, the composite blank is coupled between the anchor assembly and the stranding assembly, and the composite blank is heated along substantially the entire length of the composite blank using the heating assembly.

The heat applied by the heating assembly causes the matrix material of the composite body to revert to a plastic form. The anchor assembly holds one end of the composite blank, while the stranding assembly strands the composite blank about a longitudinal axis of the composite blank. Because the matrix material is plastic, when the composite body is heated, the matrix deforms to allow the fibers within the composite body to be stranded. When the composite body has had the desired amount of twist, the matrix material is allowed to cool so that the matrix solidifies in a new form around the twisted fibers to obtain the unformed composite strand (). If the composite green body material is collected on a spool or the like without being cut into exemplary composite green bodies, the spool itself may be rotated to twist the composite green body material about its axis.

From the outside, only the stroma is visible; the unformed composite strand is a rigid elongate body that is generally cylindrical, substantially straight or linear, and has a length that is predetermined by the parameters of the cutter; the unformed composite strand thus appears very similar to a composite green body. However, when the fibers are arranged in a substantially parallel manner within the composite blank, the fibers within the unformed composite strand are stranded internally.

Referring now to the sum of the figures, depicted therein is a forming system for converting an unformed composite strand to a formed composite strand. The forming system includes a guide assembly, a feed assembly, and a stranding assembly. The guide assembly includes a guide member, a guide bearing, and a guide clamp. The feed assembly includes a heater assembly and a feed sleeve.

The guide member is an elongated, rigid member having a shape and length similar to the shape and length of the core member. One end of the guide member is rotatably supported by the guide bearing, and the other end of the guide member is supported by the twisting assembly. The feed assembly maintains a predetermined relationship with the guide bearing.

As shown therein, the unformed composite strands are fastened to the guide member by a guide jig. The unformed composite strand is then heated by the heater assembly, thereby rendering the matrix material plastic again. The twisted assembly is then rotated as indicated by arrow a about a guide axis defined by the longitudinal axis of the guide member and pulled away from the guide bearing as indicated by arrow B along the guide axis.

As the stranding assembly rotates about and moves along the guide axis, the unformed composite strand is drawn through the heater assembly and the feeder sleeve and wound on the guide member. In addition, as the portion of the unformed composite strand wound on the guide member moves away from the heater assembly of the feed assembly, the matrix material cools and again becomes substantially rigid.

Twisting and pulling of the unformed composite strands continues until all of the strands have been pulled through the feed assembly and wound on the guide member. After all the unformed composite strands have been wound on the guide member and the matrix material allowed to cool, the unformed composite strands have been converted into formed composite rope strands. The formed composite strand is then removed from the guide member.

The exemplary formed composite strand has a generally circular cross-section at any point along its length, but exhibits a generally helical form determined by the diameter of the guide member, the rotational speed at which the stranding assembly rotates about the guide axis, and the displacement speed at which the stranding assembly displaces along the guide axis. The helical configuration of the formed composite strand can thus be quantified using the parameters of the inner diameter D determined by the diameter of the guide member and the pitch P determined by the rotation speed and displacement speed of the stranding assembly.

The helical configuration of the shaped composite strands is predetermined such that a plurality of composite strands can be combined with the core, as shown in a and B, to obtain a composite rope structure. In particular, where six formed composite strands are wound on the core, the inner diameter D is substantially the same as the diameter of the core, and the pitch P is sufficient to allow the six strands to be wound on the core with substantially no space between the strands. The geometry of the formed composite strands will therefore vary for different cores and different numbers of strands.

The matrix material used to form the exemplary formed composite strands was a thermoplastic polyurethane system and the fibers were glass fibers. However, other thermoplastic resin system materials such as polyester, polyethylene, polypropylene, nylon, PVC and mixtures thereof may be used to form the matrix. In addition, high performance fibers such as carbon fibers, aramid fibers, polyester fibers, PBO, PBI, basalt, Vectran (Vectran), HMPE, and ceramic fibers may be used.

Reference is now made to the following figures, which depict another exemplary green body shaping system that may be used in place of the green body shaping system and green body stranding system described above.

The exemplary green body forming system combines the functions of both the green body forming system and the green body stranding system to produce a composite rope structure as represented in the figures.

Specifically, the blank-forming system produces an unformed composite strand similar in composition to the unformed composite strand described above. Although the geometry of the unformed composite strand may also be the same as the geometry of the unformed composite strand, the exemplary unformed composite strand has a different geometry, as will be described further below.

The unformed composite strands are converted into formed composite strands, and the formed composite strands are combined with a core to form a composite rope structure.

Referring back now to the figure, the blank-forming system includes a plurality of feed rollers, wherein each feed roller contains a length of fiber. For clarity, the exemplary green body forming system illustrates five feed rolls and five fibers. Again, while five or fewer fibers can be used as shown, typically more than five fibers will be used when making the formed composite strand.

The fibers are flexible and can therefore be unwound from a supply roll and combined into a stranded fiber bundle using a combining assembly. The combined assembly winds the fibers to twist the fibers in the twisted bundle. The twisted fiber bundles may also be formed by braiding or otherwise mechanically winding the fibers.

A stranded fiber bundle formed of fibers is fed through a matrix pool and a forming die to obtain an uncured composite green body material. The matrix pool comprises a matrix material surrounding the fibers and forming a matrix between the fibers. At this time, the matrix material has fluidity sufficient to flow between and around the fibers forming the stranded fiber bundle, but has plasticity sufficient to maintain its shape after passing through a forming die.

The exemplary forming die forms the uncured composite green body material in a generally trapezoidal cross-sectional shape. As will become apparent from the discussion below, the exemplary forming die is thus configured to form the matrix into a shape that is controlled to achieve desired characteristics of the final composite rope structure.

Referring back to the attached, the uncured composite green body material is cured in a dryer to obtain a pre-shaped composite green body material. At this point, the matrix material may be cured and thus converted from a plastic form to a rigid form; alternatively, the matrix material may not be cured or only partially cured, in which case the composite green body material is still plastic or flexible. The exemplary matrix is sufficiently solidified around the fibers so that the preformed composite body material retains its generally trapezoidal form and is substantially straight.

The cured composite green material is then fed into a cutter that cuts the cured composite green material into unformed composite strands. An exemplary composite strand is thus a rigid elongate body that is substantially straight or linear and has a length that is predetermined by the parameters of the cutter.

Again, only the substrate is visible from the outside; the unformed composite strand is a rigid elongate body that is substantially straight or linear and has a length that is predetermined by the parameters of the cutter. Additionally, because the fibers are stranded by the stranding assembly, the fibers within the unformed composite strand are stranded. The unformed composite strand is then treated using a forming system, such as the exemplary forming system described above, to obtain a formed composite fiber.

The shaped composite fibers are then wound around a core to form a composite rope structure. As described above, the unformed composite strands have a generally trapezoidal cross-section. This geometry allows the strand to be wound around the core with little or no space between any portions of adjacent formed composite strands. The inner surface of the formed composite strand is such that there is little or no space for engagement of the core between the formed composite strand and the core. In addition, the outer surfaces of the formed composite strands are configured such that the rope structure has a generally cylindrical outer surface.

Referring now to the drawings, and therein depicted is a system and method for forming another exemplary composite rope in accordance with and embodying the principles of the present invention.

Reference is first made to the drawing, which depicts a twisting system for twisting impregnated yarns; the impregnated yarns are identified in their untwisted state by the reference mark a and in their twisted state by the reference mark b.

The impregnated yarn is a composite structure comprising fibers and resin. The fibers primarily provide the strength properties of the yarn under tensile load. The resin forms a matrix of material that surrounds the fibers and transfers loads between the fibers. The resin matrix further protects the fibers from the surrounding environment. For example, the resin matrix can be formulated to protect the fibers from heat, UV light, abrasion, and other external environmental factors.

The exemplary resin portions of the impregnated yarns are present in an uncured state and a cured state. In the uncured state, the resin material is flexible and the matrix allows the impregnated yarns to be bent, twisted, etc. Generally, when the resin matrix is heated to the curing temperature, the resin matrix becomes more plastic or malleable. Above the curing temperature, the resin matrix cures and becomes significantly more rigid. The properties of the resin matrix can be adjusted for manufacturing convenience and/or for the particular intended operating environment of the final composite rope structure.

An exemplary impregnated yarn includes about% by weight fiber and about% by weight resin. The fibres may be substantially within a first range between% and% of the yarn by weight, but should in any case be substantially within a second range between% and% of the yarn by weight. The resin may be substantially within a first range between% and% of the yarn by weight, but should in any event be substantially within a second range between% and% of the yarn by weight.

An alternative example of an impregnated yarn may include about% by weight fiber and about% by weight resin. The fibres may be substantially within a first range between% and% of the yarn by weight, but should in any case be substantially within a second range between% and% of the yarn by weight. The resin may be substantially within a first range between% and% of the yarn by weight, but should in any event be substantially within a second range between% and% of the yarn by weight.

Exemplary fibers are glass fibers, but may be one or a combination of: carbon fibers, aramid fibers, polyester fibers, PBO, PBI, basalt, HMPE, and ceramic fibers. The resin is a thermoplastic polyurethane, but other thermoplastic materials such as polyester, polyethylene, polypropylene, nylon, PVC, plastisol and mixtures thereof may also be used.

An exemplary twisting system includes a first spool a for storing untwisted impregnated yarn a and a second spool b for storing twisted impregnated yarn b. Untwisted impregnated yarn a is unwound from a first spool a, twisted, and taken up as twisted impregnated yarn b on a second spool b.

In the exemplary twisting system, the second spool B rotates about a basic rotation axis a and also about a twisting rotation axis B defined by the impregnated yarn. The rotation of the second spool B around the basic axis and the twisting axis B transforms the untwisted impregnated yarn a into a twisted impregnated yarn B and winds the twisted impregnated yarn B on the second spool B. When the fibers forming untwisted impregnated yarn a are substantially straight and parallel, the fibers forming twisted impregnated yarn b assume a generally helical configuration.

The untwisted impregnated yarn a may be twisted at room temperature. However, to facilitate the twisting process, the twisting system may also optionally comprise a heating station for heating the untwisted impregnated yarn a before, while and/or after it is twisted. The heating station raises the temperature of the resin matrix of untwisted impregnated yarn a to a temperature that has been raised but below the curing temperature of the resin matrix.

By softening the resin forming the matrix portion of untwisted infusion yarn a, the fibers can be more easily twisted into a generally helical configuration. Also, the resin matrix portion of the twisted impregnated yarn b is more likely to maintain the fiber in a generally helical configuration when it is preheated and then allowed to cool before, while, and/or after being twisted.

The exemplary stranding system also optionally includes a release agent station for applying release agent (releasegent) to the stranded impregnated yarn b as it is wound onto the second spool b. A release agent or similar chemical helps prevent binding between the twisted impregnated yarns at elevated temperatures or when cured during subsequent combining of the twisted impregnated yarns b with other rope components as will be described below.

A first exemplary combination system for combining a plurality of uncured twisted impregnated yarns b into a strand is illustrated. The exemplary strand comprises seven twisted impregnated yarns b in the so-called X configuration. However, it is possible to use more or fewer yarns and to combine the twisted impregnated yarns b in a combined structure other than the X configuration.

To form an exemplary strand, seven second spools b are supported by the first spinner assembly. The first spinner assembly is or may be a conventional spinner assembly and will only be described herein as necessary for a full understanding of the present invention. An exemplary first spinner assembly includes a central creel and six peripheral creels. The central creel allows the second spool b supported thereon to rotate about its primary axis a. The second spools b are supported by the peripheral spool support for rotation about their primary axes a.

The peripheral creel further supports the second spool b for common rotation about a system axis C defined by the first spinner assembly. The central creel may be supported with the peripheral creels such that the second spools b supported thereby also rotate about the system axis C with the second spools b supported at the peripheral creels. Alternatively, the central spool stand may be supported independently of the peripheral spool stands, such that the second spool b supported thereby rotates only about its primary axis a and not about the system axis C.

When the twisted impregnated yarn b is withdrawn from the first rotator assembly, the twisted impregnated yarn b unwound from the second bobbin b at the peripheral creel is combined with the twisted impregnated yarn b unwound from the second bobbin b at the central creel to form a strand. In an exemplary system, the strand is reeled up on a strand spool.

The stranded yarn b unwound from the second creel b at the central creel forms the core impregnated yarn of the strand. The fibers in the core impregnated yarn maintain the generally helical configuration created by the stranding system. The twisted impregnated yarn b surrounding the core yarn will be referred to as the peripheral yarn. The fibers in the peripheral yarns maintain the generally helical configuration produced by the stranding system, but will also have a secondary helical configuration centered around the core yarn. The fibres in the peripheral yarns thus have a substantially double-spiral configuration.

The twisted impregnated yarns b may be combined at room temperature to form strands. However, to facilitate the assembly process, the first assembly system may also optionally comprise a heating station for heating the twisted impregnated yarns a before and/or while they are being assembled. The heating station raises the temperature of the resin matrix of the twisted impregnated yarn b to a temperature that has been raised but below the curing temperature of the resin matrix.

The twisted impregnated yarn b can be more easily combined into a strand with the fibers of the core yarn having a generally helical configuration and the fibers of the peripheral yarns having a generally double helical configuration by softening the resin forming the matrix portion of the twisted impregnated yarn b. Likewise, when the twisted impregnated yarn b is preheated before, while, and/or after being twisted and then allowed to cool, the resin matrix portion of the twisted impregnated yarn b is more likely to maintain the fibers of the core impregnated yarn in a helical configuration and the fibers in the peripheral impregnated yarn in a substantially dual helical configuration.

The exemplary combination system also optionally includes a release agent station for applying release agent to each strand as the strands are reeled up on the strand spools. Release agents or similar chemicals help prevent bonding between strands at elevated temperatures or when cured during subsequent combining of the strands with other strand components as will be described below.

The exemplary second combined system also includes an optional forming die. The forming die is arranged at a position where the end portions are twisted and joined together.

The example strands may be cured by heating the strands above a curing temperature to form a first example composite rope structure. Specifically, when the strands are cured, the properties of the strands may meet the requirements of the intended operating environment. Other operating environments may require the combination of multiple strands to form the final composite rope structure. In this case, the resin matrix of the strands will remain uncured or only partially cured.

A second combination system for combining a plurality of strands into a rope structure is illustrated. The exemplary rope structure comprises seven strands in a so-called X-configuration. However, more or fewer yarns and/or strands may be used and the strands may be combined in combination structures other than the X configuration.

To form the exemplary rope structure, seven strand spools are supported by a second spinner assembly. This second spinner assembly is or may be a conventional spinner assembly and will only be described herein as necessary for a full understanding of the present invention. The exemplary second spinner assembly includes a central creel and six peripheral creels. The central creel allows the strand spools supported thereon to rotate about its primary axis. The strand spools supported by the peripheral spool support are supported for rotation about their base axes.

The peripheral creel further supports the strand spools for rotation together about a system axis D defined by the second spinner assembly. The central creel may be supported with the peripheral creels such that the strand spools supported thereby also rotate about the system axis D with the strand spools supported at the peripheral creels. Alternatively, the central creel may be supported independently of the peripheral creels, so that the strand spools supported thereby rotate only about its primary axis a and not about the system axis D.

When the strands are extracted from the second spinner assembly, the strands unwound from the strand spools at the peripheral spool stands combine with the strands unwound from the strand spools at the central spool stand to form a rope structure. In an exemplary system, the cord structure is wound on a cord spool.

The strands unwound from the strand spools at the central creel form the core strands of the rope structure. The fibers in the core strand retain the shape produced by the first combination system. The strands surrounding the core strand will be referred to as peripheral strands. The fibers in the peripheral yarns of the peripheral strand retain the shape produced by the first combination system, but will also have a three-level helical configuration centered around the core strand. The fibres in the peripheral yarns thus have a substantially triple helix configuration.

The strands may be combined at room temperature to form a rope structure. However, to facilitate the combining process, the second combining system may also optionally include a heating station for heating the strands before, while, and/or after the strands are combined. The heating station raises the temperature of the resin matrix of the strand to a temperature that has been raised but below the curing or melting temperature of the resin system.

By softening the resin forming the matrix portion of the strand, the strand can be more easily combined with the fibers that maintain the proper helical configuration into a strand. Also, the resin matrix portion of the strands is more likely to maintain the fibers in a proper helical configuration when the strands are preheated before, while, and/or after being twisted and then allowed to cool.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An improved composite material rope structure is characterized in that: the anti-tear and wear-resistant composite rope comprises a central layer, a reinforcing layer, an anti-impact layer, an anti-tear layer and a wear-resistant layer, wherein the central layer comprises a plurality of composite rope strands, the composite rope strands comprise a fiber material and a matrix material, the reinforcing layer comprises carbon fibers, the carbon fibers are coated outside the central layer, the anti-impact layer is coated outside the reinforcing layer, the anti-tear layer is coated outside the anti-impact layer, and the wear-resistant layer is coated outside the anti-tear layer.

2. An improved composite rope structure as defined in claim 1, wherein: the fiber material and the matrix material are helically stranded.

3. An improved composite rope structure as defined in claim 1, wherein: the fiber material is composed of one or more of aramid fiber, polyester fiber, PBO, PBI, basalt, HMPE and ceramic fiber.

4. An improved composite rope structure as defined in claim 1, wherein: the matrix material is composed of one or more of thermoplastic polyurethane, polyethylene, polypropylene, PVC and nylon.

5. An improved composite rope structure as defined in claim 1, wherein: the anti-tearing layer is nylon mesh cloth with the thickness of 1mm-1.3 mm.

6. An improved composite rope structure as defined in claim 1, wherein: the anti-impact layer is composed of a polyurethane corrugated belt and natural rubber, and the thickness of the anti-impact layer is 6mm-8 mm.

7. An improved composite rope structure as defined in claim 1, wherein: the wear-resistant layer is made of wear-resistant epoxy resin and has the thickness of 0.6mm-8 mm.

8. An improved composite rope structure as defined in claim 1, wherein: the central layer is provided with a plurality of yarns.