Large-tonnage flat lifting belt with reinforcing lifting ring

Abstract

According to the large-tonnage flat hanging belt with the reinforcing hanging rings, the high-strength alloy steel hanging rings are arranged at the two ends of the flat hanging belt body, and the hanging belt body is bent to form the outer ring body through the fixing structure, so that the high-strength alloy steel hanging rings are arranged in the outer ring body; meanwhile, the aramid fiber sewing layer, the composite fiber sewing layer, the metal wire sewing layer, the anti-extrusion layer and the wear-resistant layer are sequentially arranged on the outer side of the outer ring body and the outer side of the alloy steel lifting ring from inside to outside, and the multi-layer composite structure design remarkably improves the stability and the fixing firmness of the high-strength alloy steel lifting ring in the outer ring body; the high-strength alloy steel lifting ring is prevented from being displaced or loosened in the stress process, the joint of the high-strength alloy steel lifting ring and the outer ring body is endowed with excellent wear resistance, extrusion resistance, cutting resistance and tear resistance, and the severe working conditions such as hard object scraping and local high-pressure impact possibly occurring in the lifting operation are effectively handled.

Description

Technical Field

[0001] This utility model relates to the field of flat sling technology, specifically a large-tonnage flat sling with reinforced lifting rings. Background Technology

[0002] Flat slings, as commonly used lifting tools, are widely used in heavy machinery, construction engineering, port transportation, and other fields. Existing flat slings are typically woven from high-strength polyester yarn and other materials, offering advantages such as light weight, good flexibility, and no damage to the surface of the object being lifted. However, in actual lifting operations, especially when facing heavy loads, the eyelets (the parts at both ends of the sling body used to connect to hooks or other lifting tools) often become vulnerable points due to insufficient protection. When the eyelets come into contact with tooling or hard objects with burrs or sharp edges, they are prone to wear and tear, leading to overall sling failure and posing significant safety hazards.

[0003] Especially in heavy-duty lifting applications, the risk of breakage increases further due to the greater tensile stress and localized compressive stress on the sling body and eyelets. Therefore, it is necessary to optimize the structure and strengthen the materials of the eyelets of flat slings to improve their wear resistance, compressive strength, and overall service life, thereby effectively ensuring the safety and reliability of lifting operations. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a large-tonnage flat sling with reinforced lifting eyelets, which effectively improves the problems of easy wear, easy tearing, and insufficient compression resistance of the eyelets in some traditional large-tonnage flat slings, and significantly enhances the safety and durability of the sling in heavy-duty lifting operations.

[0005] A high-tonnage flat sling with reinforced lifting rings includes a flat sling body and high-strength alloy steel lifting rings disposed at both ends of the flat sling body. The two ends of the flat sling body are respectively bent towards the other end and fixed by a fixing structure to form an outer ring body. The high-strength alloy steel lifting rings are disposed in the outer ring body. From the inside to the outside of the outer ring body and the high-strength alloy steel lifting rings, an aramid fiber stitching layer, a composite fiber stitching layer, a metal wire stitching layer, an anti-compression layer, and a wear-resistant layer are sequentially disposed.

[0006] Preferably, the high-strength alloy steel lifting ring has multiple arc-shaped protrusions on its outer periphery.

[0007] Preferably, the wire stitching layer includes a twill wire stitching layer and a plain wire stitching layer covering the outside of the twill wire stitching layer.

[0008] Preferably, the aramid fiber stitching layer comprises warp yarns woven from multiple aramid fiber filaments and weft yarns woven from multiple aramid fiber filaments, wherein the multiple warp yarns and multiple weft yarns are interwoven in a plain knitting manner.

[0009] Preferably, the composite fiber stitching layer includes multiple warp threads woven from a mixture of glass fibers and polyester staple fibers, and multiple warp threads and multiple weft threads are interwoven in a twill knitting manner.

[0010] Preferably, the compression-resistant layer is made of spandex fiber material.

[0011] Preferably, the wear-resistant layer is made of carbon fiber, Kevlar fiber, or ultra-high molecular weight polyethylene fiber.

[0012] Preferably, the flat suspender body comprises multiple layers of flat substrate stitched together by sewing thread. The flat substrate is woven from several strands of high-strength polyester yarn. A protective sleeve woven from high-strength polyester fiber is provided on the outside of the stitched flat substrate by sewing thread. The weaving density of the protective sleeve is less than that of the flat substrate.

[0013] Preferably, the fixing structure includes a folded and layered stitching of the flat suspender body and a high-strength polyester fiber fixing sleeve disposed on the outside of the folded flat suspender body, wherein the friction between the high-strength polyester fiber fixing sleeve and the flat suspender body is greater than the weight of the high-strength polyester fiber fixing sleeve itself.

[0014] Preferably, the aramid fiber stitched layer, the composite fiber stitched layer, the compression-resistant layer, and the abrasion-resistant layer are connected by stitching or adhesive.

[0015] Preferably, a padding layer is provided on the inner side of the bends at both ends of the flat sling body, and the padding layer is sewn to the outer ring body by a stitch.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This utility model provides a large-tonnage flat sling with reinforced lifting rings. High-strength alloy steel lifting rings are installed at both ends of the flat sling body. The sling body is bent and then fixed to form an outer ring, with the high-strength alloy steel lifting rings positioned inside the outer ring. Simultaneously, from the inside out, an aramid fiber stitching layer, a composite fiber stitching layer, a metal wire stitching layer, an anti-compression layer, and a wear-resistant layer are sequentially arranged on the outer ring and the outer side of the alloy steel lifting ring. This multi-layered composite structure design not only significantly improves the stability and secure fixation of the high-strength alloy steel lifting ring within the outer ring, preventing displacement or loosening during stress, but also endows the connection between the high-strength alloy steel lifting ring and the outer ring with excellent wear resistance, compression resistance, cut resistance, and tear resistance, effectively coping with harsh working conditions such as scratches from hard objects and localized high-pressure impacts that may occur during lifting operations. Meanwhile, the high-strength alloy steel lifting rings themselves possess high strength, high toughness, large contact area, and good corrosion resistance. When bearing heavy loads, they can effectively improve the overall lifting strength and safety reliability, reducing the risk of breakage and failure during lifting operations. Therefore, this heavy-duty flat sling with reinforced lifting rings not only solves the problems of poor protection and easy damage at the eye points of traditional heavy-duty flat slings, but also significantly improves the safety, durability, and operational efficiency of the overall lifting system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the large-tonnage flat sling with reinforced lifting rings described in this utility model;

[0019] Figure 2 This is a partial structural diagram of the large-tonnage flat sling with reinforced lifting rings described in this utility model;

[0020] Figure 3 for Figure 1 Schematic diagram of the cross section at point AA.

[0021] in:

[0022] 10-Flat sling body, 20-High-strength alloy steel lifting ring, 30-Outer ring body, 40-Aramid fiber stitching layer, 50-Composite fiber stitching layer, 60-Metal wire stitching layer, 70-Anti-compression layer, 80-Abrasion-resistant layer, 90-Fixing structure. Detailed Implementation

[0023] The embodiments described below are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] See Figures 1-3This embodiment provides a large-tonnage flat sling with reinforced lifting rings, which includes a flat sling body 10 and high-strength alloy steel lifting rings 20 disposed at both ends of the flat sling body 10. The two ends of the flat sling body 10 are respectively bent towards the other end and fixed by a fixing structure 90 to form an outer ring body 30. The high-strength alloy steel lifting rings 20 are disposed inside the outer ring body 30. The outer ring body 30 and the outer side of the high-strength alloy steel lifting rings 20 are sequentially covered from the inside to the outside with an aramid fiber stitched layer 40, a composite fiber stitched layer 50, a metal wire stitched layer 60, an anti-compression layer 70, and a wear-resistant layer 80.

[0025] Preferably, the high-strength alloy steel lifting ring 20 has multiple arc-shaped protrusions on its outer periphery. By evenly distributing these arc-shaped protrusions on the outer periphery of the lifting ring, a larger contact area and increased friction are formed between the lifting ring and the inner side of the outer ring body 30, significantly improving the stable connection between the two and preventing the lifting ring from sliding, rotating, or misaligning during lifting operations. This further enhances the overall structural robustness and safety.

[0026] Preferably, the metal wire stitching layer 60 includes a twill metal wire stitching layer 60 and a plain metal wire stitching layer 60 covering the outside of the twill metal wire stitching layer 60. The twill metal wire stitching layer 60 adopts a diagonally woven metal wire structure, which has strong tensile strength and tear resistance. When subjected to tensile force, the twill structure can disperse the tensile force and reduce local stress concentration through its interlaced metal wire fibers, thereby improving the strength and toughness of the stitching layer. This makes the sling less prone to tearing or deformation under high-intensity loads, especially under sudden impact or uneven loads, the twill structure can effectively mitigate the risk of structural failure. The plain metal wire stitching layer 60, through its linearly arranged metal wire structure, improves the density of the stitching layer while enhancing its wear resistance and cut resistance. The uniform weave of the plain structure makes the metal wire distribution denser, which can effectively improve the connection strength between the outer ring 30 and the lifting ring, preventing the lifting ring from slipping or loosening due to external factors such as friction and collision. Furthermore, the plain weave structure provides better fatigue resistance and extends the service life of the sling by reducing friction and cutting. By combining the twill wire stitching layer 60 with the plain weave wire stitching layer 60, the wire stitching layer 60 simultaneously possesses good tensile strength, tear resistance, and superior wear and cut resistance, effectively improving the tight bond between the outer ring 30 and the high-strength alloy steel lifting ring 20. This not only ensures the stability of the sling during heavy-load and high-intensity lifting operations but also significantly improves its impact resistance, friction resistance, and long-term durability, ensuring the safety and reliability of lifting operations.

[0027] Preferably, the aramid fiber stitching layer 40 comprises warp yarns woven from multiple aramid fiber filaments and weft yarns woven from multiple aramid fiber filaments, with the warp and weft yarns interwoven in a plain knit pattern. Aramid fibers, with their excellent high strength, heat resistance, and chemical corrosion resistance, are widely used in high-load, wear-resistant applications. In this embodiment, the warp and weft yarns of the aramid fiber stitching layer 40 are interwoven in a plain knit pattern and wrapped around the outer ring 30 and the high-strength alloy steel lifting ring 20. This weaving method not only provides good tensile strength and tear resistance but also effectively increases the structural stability of the fabric. Specifically, in the plain knit structure, the warp and weft yarns are arranged alternately in a one-to-one pattern, making the fiber interweaving more uniform and compact. This structure significantly improves the overall wear resistance and pressure resistance of the aramid fiber layer. The high strength and rigidity of the aramid fibers ensure that the sling is not easily broken during lifting and can effectively withstand the tensile and compressive forces brought by large tonnage loads. The plain weave enhances the stability of the layer, making the aramid fibers less prone to deformation or loosening during long-term use, thus improving the durability of the straps.

[0028] Preferably, the composite fiber stitching layer 50 comprises multiple warp threads woven from a mixture of glass fiber and polyester staple fiber, and multiple weft threads interwoven in a twill knitting pattern. In this embodiment, the composite fiber stitching layer 50 is disposed on the outside of the aramid fiber stitching layer 40, further enhancing the connection strength between the outer ring 30 and the high-strength alloy steel lifting ring 20. The composite fiber stitching layer 50, through the mixed weaving of glass fiber and polyester staple fiber, possesses high strength, wear resistance, and good toughness, effectively dispersing and buffering the tensile and compressive forces applied to the connection during lifting, reducing local stress concentration at the connection, and improving the overall tear and impact resistance of the connection. Simultaneously, by interweaving the warp and weft threads of the mixed glass fiber and polyester staple fiber in a twill knitting pattern, the composite fiber stitching layer 50 exhibits stronger tensile and tear resistance. The twill interweaving structure forms a stronger connection between the fibers, enhancing the friction between the fibers, resulting in better structural stability and mechanical properties for the entire layer. In addition, the twill knitting method makes the fiber layers evenly distributed in different directions, which further improves the load-bearing capacity and durability of the joints.

[0029] Preferably, the anti-compression layer 70 is made of spandex fiber. Spandex fiber has extremely high elasticity and excellent recovery properties, enabling it to return to its original shape after being deformed by external compression. By setting the anti-compression layer 70 between the outer ring 30 and the high-strength alloy steel lifting ring 20, local compression pressure can be effectively buffered and dispersed, avoiding local structural damage or tearing at the connection due to high-intensity concentrated compression. At the same time, the good flexibility of spandex fiber material can also improve the overall adaptability and coverage of the outer ring 30, further enhancing the service life and safety performance of the sling connection.

[0030] Preferably, the wear-resistant layer 80 is made of carbon fiber, Kevlar fiber, or ultra-high molecular weight polyethylene fiber. These materials all possess excellent wear resistance and high strength, effectively resisting wear damage caused by frequent friction, scratching, or impact during hoisting. By setting the wear-resistant layer 80, not only is the surface protection capability of the connection between the outer ring 30 and the high-strength alloy steel lifting ring 20 enhanced, but the aging and damage of the sling in complex operating environments are also effectively delayed, ensuring the long-term reliability and safety of heavy-duty hoisting operations.

[0031] It should be noted that in this embodiment, the aramid fiber stitching layer 40, the composite fiber stitching layer 50, the metal wire stitching layer 60, the compression-resistant layer 70, and the wear-resistant layer 80 are arranged in multiple layers and cooperate in a coordinated manner between the outer ring body 30 and the high-strength alloy steel lifting ring 20. The cooperation of each layer makes the overall structure of the sling connection more robust and has excellent performance, while avoiding tearing at the connection of the outer ring body 30. Specifically, the aramid fiber stitching layer 40 is located at the innermost layer and has excellent high strength and high toughness. It can effectively disperse and buffer the initial tensile and shear forces borne by the connection between the lifting ring and the outer ring body 30, and improve the basic bonding strength. The composite fiber stitching layer 50 is located on the outside of the aramid fiber stitching layer 40 and is made of a mixture of glass fiber and polyester short fiber. It has both high modulus and a certain degree of flexibility, further enhancing the overall tensile strength and fatigue resistance of the connection area and preventing material fatigue failure under long-term use. The metal wire stitching layer 60 is tightly wrapped around the outside of the composite fiber stitching layer 50 through a composite structure of twill and plain weave. It utilizes the high hardness of the metal wire to form A strong support network is formed, effectively limiting local deformation or tearing of the outer ring 30 material, while increasing the friction coefficient between the outer ring 30 and the high-strength alloy steel lifting ring 20, making the two more tightly and stably bonded. Outside the metal wire stitching layer 60, the compression-resistant layer 70 is made of spandex fiber, which has excellent elasticity and deformation resistance. During hoisting, it can effectively offset local concentrated compression force and further prevent the sling from loosening under high load. The outermost wear-resistant layer 80 provides high wear resistance, tear resistance and impact resistance, providing good external protection for the entire connection area and greatly extending the service life of the sling connection in complex environments.

[0032] Preferably, the flat sling body 10 comprises multiple layers of flat substrates stitched together by sewing. These flat substrates are woven from several strands of high-strength polyester yarn. A protective sleeve made of high-strength polyester fiber is sewn onto the outer side of the stitched flat substrate, with a weaving density lower than that of the flat substrate. By using multiple layers of flat substrates and stitching them together, the overall load-bearing strength and tear resistance of the sling body can be significantly improved, ensuring sufficient safety margin in heavy-duty lifting operations. Simultaneously, it can distribute the load during lifting, avoiding damage or breakage caused by localized stress concentration, further enhancing safety. Furthermore, the protective sleeve, as the outer protective structure of the flat substrate, is woven from high-strength polyester fiber material. It not only possesses excellent wear resistance and aging resistance, but also, due to its lower weaving density than the flat substrate, can initially bear the external abrasion when the sling is subjected to external friction or cutting, thus dispersing stress, slowing damage propagation, and preventing damage from directly affecting the load-bearing layer, effectively extending the overall service life of the flat sling.

[0033] Preferably, the fixing structure 90 includes the flat suspender body 10 bent and layered with stitching thread, and a high-strength polyester fiber fixing sleeve disposed on the outside of the layered flat suspender body 10. The friction between the high-strength polyester fiber fixing sleeve and the flat suspender body 10 is greater than the weight of the high-strength polyester fiber fixing sleeve itself. By bending and layering the end of the flat suspender body 10, and then using high-strength stitching for multiple reinforcement stitches, the overall tensile and tear resistance of the layered part can be effectively improved, preventing the outer ring 30 from cracking or loosening during long-term stress or impact. The high-strength polyester fiber fixing sleeve is made of densely woven polyester material with excellent tensile properties. After covering the layered part, it forms a firm compression fit with the suspender body through its own elasticity. This not only further enhances the structural strength of the layered part, but also limits possible relative sliding through high friction, effectively avoiding local displacement or loosening caused by load changes, vibration, or external impact. In addition, the high-strength polyester fiber fixing sleeve can disperse some of the tensile stress when the layers are subjected to force, reduce the stress concentration effect, improve the overall stress uniformity at the connection, thereby extending the service life of the flat sling and improving its safety and reliability in heavy-duty lifting operations.

[0034] Preferably, the aramid fiber stitching layer 40, the composite fiber stitching layer 50, the compression-resistant layer 70, and the abrasion-resistant layer 80 are connected by stitching or adhesive.

[0035] Preferably, a padding layer is provided on the inner side of the bends at both ends of the flat sling body 10, and the padding layer is sewn to the outer ring body 30 by stitching. The padding layer, located on the inner side of the bends, can buffer and disperse stress when the sling body contacts the high-strength alloy steel lifting ring 20 and bears a large load, effectively reducing stress concentration in localized areas at the layered connection of the outer ring body 30 and preventing tearing due to excessive stress concentration.

[0036] This utility model provides a large-tonnage flat sling with reinforced lifting rings. High-strength alloy steel lifting rings 20 are installed at both ends of the flat sling body 10. The sling body is bent and then fixed by a fixing structure 90 to form an outer ring 30, with the high-strength alloy steel lifting rings 20 positioned inside the outer ring 30. Simultaneously, from the inside out, an aramid fiber stitching layer 40, a composite fiber stitching layer 50, a metal wire stitching layer 60, an anti-compression layer 70, and a wear-resistant layer 80 are sequentially arranged on the outer ring 30 and the outer side of the alloy steel lifting rings. This multi-layered composite structure design not only significantly improves the stability and secure fixing of the high-strength alloy steel lifting rings 20 within the outer ring 30, preventing displacement or loosening during stress, but also endows the connection between the high-strength alloy steel lifting rings 20 and the outer ring 30 with excellent wear resistance, compression resistance, cut resistance, and tear resistance, effectively coping with harsh working conditions such as hard object scratches and localized high-pressure impacts that may occur during lifting operations. Meanwhile, the high-strength alloy steel lifting eyelet 20 itself possesses high strength, high toughness, large contact area, and good corrosion resistance. When bearing heavy loads, it can effectively improve the overall lifting strength and safety reliability, reducing the risk of breakage and failure during lifting operations. Therefore, this heavy-duty flat sling with reinforced lifting eyelets not only solves the problems of poor protection and easy damage at the eyelet area of ​​traditional heavy-duty flat slings, but also significantly improves the safety, durability, and operational efficiency of the overall lifting system.

[0037] The above-disclosed embodiments are merely some preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model patent application shall still fall within the scope of the present utility model.

Claims

1. A large tonnage flat lifting sling having reinforced lifting eyes, characterized by: It comprises a flat sling body and a high-strength alloy steel ring arranged at both ends of the flat sling body, both ends of the flat sling body are respectively partially bent towards the other end and form an outer ring body through a fixing structure, the high-strength alloy steel ring is arranged in the outer ring body, and the outer ring body and the outside of the high-strength alloy steel ring are sequentially provided from inside to outside with an aramid fiber stitching layer, a composite fiber stitching layer, a metal wire stitching layer, an anti-extrusion layer and a wear-resistant layer.

2. The large tonnage flat lifting sling having reinforced lifting eyes of claim 1, wherein, The high-strength alloy steel ring is provided with a plurality of arc-shaped protrusions on the periphery.

3. The large tonnage flat lifting sling having reinforced lifting eyes of claim 1 wherein, The metal wire stitching layer comprises a twill metal wire stitching layer and a plain metal wire stitching layer wrapped outside the twill metal wire stitching layer.

4. The large tonnage flat lifting sling having reinforced lifting eyes of claim 1 wherein, The aramid fiber stitching layer comprises a plurality of aramid fiber yarns woven into warp threads and a plurality of aramid fiber yarns woven into weft threads, and the plurality of warp threads and the plurality of weft threads are interwoven in a plain knitting manner.

5. The large tonnage flat lifting sling having reinforced lifting eyes of claim 1 wherein, The composite fiber stitching layer comprises a plurality of glass fibers and polyester staple fibers mixedly woven into warp threads and a plurality of glass fibers and polyester staple fibers mixedly woven into weft threads, and the plurality of warp threads and the plurality of weft threads are interwoven in a twill knitting manner.

6. The large tonnage flat lifting sling having reinforced lifting eyes of claim 1 wherein, The anti-extrusion layer is made of spandex fiber material.

7. The large tonnage flat lifting sling having reinforced lifting eyes of claim 1 wherein, The wear-resistant layer is made of carbon fiber material, Kevlar fiber material or ultra-high molecular weight polyethylene fiber weaving.

8. The large tonnage flat lifting sling having reinforced lifting eyes of claim 1 wherein, The flat sling body comprises a plurality of flat substrates stitched by sewing thread, the flat substrates are woven by a plurality of high-strength polyester yarns, and the outside of the flat substrates after stitching is provided with a protective sleeve woven by high-strength polyester fiber through sewing thread, and the weaving density of the protective sleeve is less than the weaving density of the flat substrates.

9. The large tonnage flat lifting sling having reinforced lifting eyes of claim 1 wherein, The fixing structure comprises a laminated stitching sewing thread after the flat sling body is bent, and a high-strength polyester fiber fixing sleeve arranged outside the laminated flat sling body, and the friction force between the high-strength polyester fiber fixing sleeve and the flat sling body is greater than the gravity of the high-strength polyester fiber fixing sleeve itself.

10. The large tonnage flat lifting sling having reinforced lifting eyes of claim 1 wherein, The aramid fiber stitching layer, the composite fiber stitching layer, the anti-extrusion layer and the wear-resistant layer are connected by sewing thread or adhesive.

Images