Integrated flat sling with inner ring and outer ring

Abstract

According to the inner and outer double-ring integrated flat sling provided by the utility model, the annular flat sling is connected with the connecting belt, and the sling is divided into two double-ring structures with different sizes, so that the sling can flexibly select suitable rings for operation according to different hoisting requirements in the use process, and frequent replacement of slings with different specifications is avoided; therefore, the operation efficiency is effectively improved. The annular flat hanging belt and the connecting belt are each provided with a first flat woven layer, a second flat woven layer and a third flat woven layer which are arranged in a laminated mode, the outer sides of the laminated layers are provided with a wear-resistant layer in a surrounding mode, the overall structure has good wear-resistant performance and high tensile strength, hoisting loads can be effectively dispersed, the service life is prolonged, and safety is improved. The two ends of the connecting band and the annular flat sling part are overlaid and then continuously woven, the outer side of the connecting position is sequentially wrapped with the two wrapping layers, and the two wrapping layers are sewn and fixed through the sewing threads, so that the firmness and the abrasion resistance of the connecting position are further enhanced, and the risk that the connecting position is damaged in the high-load hoisting process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of flat sling technology, specifically a flat sling with an inner and outer double ring design. Background Technology

[0002] In existing lifting operations, ring-shaped flat slings are widely used as lifting tools. Ring-shaped flat slings are typically made of high-strength fiber materials, offering advantages such as light weight, good flexibility, and minimal risk of damaging the surface of the lifted object. However, traditional ring-shaped flat slings are usually designed with a fixed length. In actual lifting operations, for objects of different sizes and weights, or for different working environments, it is often necessary to frequently change slings of different lengths and load capacities. This not only increases the complexity of manual operations and work time, but also leads to higher labor costs and the risk of work interruption due to frequent sling changes. Furthermore, if the wrong sling specifications are selected, resulting in mismatched lifting parameters, it can easily cause safety hazards and pose significant operational risks.

[0003] To address the aforementioned issues, existing technologies propose using adjustable slings to adapt to different lifting requirements to some extent. However, existing adjustable slings are often structurally complex, costly to manufacture, and cumbersome to adjust. Furthermore, their tensile strength is low after length adjustment, hindering the rapid and safe completion of lifting operations. Therefore, it is necessary to provide a sling with a simple structure, robust connection, adaptability to different length requirements, and ease of use to improve the efficiency and safety of lifting operations and reduce labor costs and accident risks. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an integrated flat sling with inner and outer double rings, which effectively improves upon the problems of traditional ring flat slings, which are usually designed with a fixed length and require frequent replacement of the appropriate specifications for different working conditions during actual lifting operations, thereby increasing labor costs.

[0005] An integrated flat suspender strap with inner and outer double rings includes an annular flat suspender strap and a connecting strap. Both the annular flat suspender strap and the connecting strap include a first flat woven layer, a second flat woven layer, and a third flat woven layer stacked together. An abrasion-resistant layer is provided around the outer side of the stacked first flat woven layer, second flat woven layer, and third flat woven layer. The two ends of the connecting strap are respectively connected to the annular flat suspender strap to divide the annular flat suspender strap into two double ring structures of different sizes. The larger ring structure of the annular flat suspender strap is provided with a length adjuster. The two ends of the connecting strap are continuously woven on the annular flat suspender strap, and the outer side of the connection is covered with two covering layers from the inside to the outside. The two covering layers are sewn to the connecting strap and the annular flat suspender strap by a stitch.

[0006] Preferably, both the first flat braided layer and the third flat braided layer include multiple warp yarns woven from a mixture of glass fiber and polyester staple fiber, and multiple warp yarns and multiple weft yarns are interwoven in a twill knitting manner.

[0007] Preferably, the second flat braided layer includes warp yarns woven from multiple aramid fiber filaments and weft yarns woven from multiple aramid fiber filaments, with the multiple warp yarns and multiple weft yarns interwoven in a plain knitting manner.

[0008] Preferably, the wear-resistant layer is woven from carbon fiber, Kevlar fiber, or ultra-high molecular weight polyethylene fiber, and the wear-resistant layer is formed by sewing the first flat woven layer, the second flat woven layer, and the third flat woven layer together on the outer side.

[0009] Preferably, the length adjuster is a length adjusting buckle or a magnetic length adjuster.

[0010] Preferably, the number of length adjusters is set to 1 to 3.

[0011] Preferably, the inner covering layer is woven from ultra-high molecular weight polyethylene fiber. After the inner covering layer covers the connection, it is connected to the annular flat suspender and the connecting strap by stitching. The outer covering layer is woven from carbon fiber material. After the outer covering layer covers the outside of the inner covering layer, it is connected to the inner covering layer, the annular flat suspender, and the connecting strap by stitching.

[0012] Preferably, the ratio of the circumferences of the two double-ring structures of different sizes is 1:1.2 to 1:2.5.

[0013] Preferably, the first flat knit layer, the second flat knit layer, and the third flat knit layer are knitted together.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This utility model provides an integrated flat sling with inner and outer double rings. By setting a connecting strap on the annular flat sling and fixing both ends of the connecting strap to the annular flat sling, the original single ring structure is divided into two double ring structures of different sizes. This allows the sling to flexibly select the appropriate ring structure for different lifting needs, eliminating the need for frequent changes of slings of different lengths or specifications, greatly improving the convenience and efficiency of lifting operations, and reducing the intensity of manual operation and replacement costs. Secondly, both the annular flat sling and the connecting strap are composed of a first flat braided layer, a second flat braided layer, and a third flat braided layer stacked together, with a wear-resistant layer surrounding the outer side, effectively improving the overall wear resistance and tensile strength of the sling, extending its service life. The woven structure gives the sling excellent flexibility and high strength, while also distributing the load during lifting, preventing damage or breakage caused by localized stress concentration, thus further improving safety. Secondly, the connecting straps at both ends are continuously woven together with the looped flat sling section, and two layers are sequentially wrapped around the outside of the connection point, secured by stitching, further enhancing the connection's strength and abrasion resistance, reducing the risk of damage to the connection point during high-load lifting. Simultaneously, the large looped flat sling is equipped with a length adjuster, allowing for adjustment of the large loop when lifting with the smaller loop side, preventing problems such as stacking and tangling caused by excessively long loops. Therefore, this integrated double-loop flat sling offers advantages such as flexible and convenient use, reliable and secure connection, excellent abrasion and tensile strength, and high operational safety, significantly improving the efficiency and safety of lifting operations and reducing manpower consumption and operational risks caused by frequent sling changes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the integrated flat suspender with inner and outer double rings described in this utility model;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the annular flat sling described in this utility model;

[0018] in:

[0019] 10- Circular flat sling, 20- Connecting strap, 30- Large circular structure, 40- Small circular structure, 50- Length adjuster, 11- First flat braided layer, 12- Second flat braided layer, 13- Third flat braided layer, 14- Wear-resistant layer. Detailed Implementation

[0020] 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.

[0021] See Figure 1 as well as Figure 2 This embodiment provides an integrated flat suspender strap with inner and outer double rings, comprising a ring-shaped flat suspender strap 10 and a connecting strap 20. Both the ring-shaped flat suspender strap 10 and the connecting strap 20 include a first flat woven layer 11, a second flat woven layer 12, and a third flat woven layer 13 stacked together. An abrasion-resistant layer 14 is arranged around the outer side of the stacked first flat woven layer 11, second flat woven layer 12, and third flat woven layer 13. The two ends of the connecting strap 20 are respectively connected to the ring-shaped flat suspender strap 10 to divide the ring-shaped flat suspender strap 10 into two double-ring structures of different sizes. The larger ring structure 30 of the ring-shaped flat suspender strap 10 is provided with a length adjuster 50. The two ends of the connecting strap 20 are continuously woven by stitching on the ring-shaped flat suspender strap 10, and the outer side of the connection is covered by two covering layers from the inside to the outside. The two covering layers are stitched to the connecting strap 20 and the ring-shaped flat suspender strap 10.

[0022] Preferably, both the first flat woven layer 11 and the third flat woven layer 13 include multiple warp yarns woven from a mixture of glass fiber and polyester staple fiber, and multiple warp yarns woven from a mixture of glass fiber and polyester staple fiber. The multiple warp yarns and multiple weft yarns are interwoven in a twill knitting pattern. Specifically, during the weaving process, glass fiber and polyester staple fiber are mixed in a certain proportion to form yarns, which serve as warp and weft materials. Following the twill weave pattern, adjacent yarns are interlaced and overlapped sequentially, forming an inclined twill pattern on the fabric surface. Each yarn participates in the structure of multiple intersection points. Compared with plain weave, the twill knitting structure has higher flexibility and better tensile strength, which can effectively distribute the concentrated load applied to the sling and reduce the risk of local wear and breakage. At the same time, glass fiber gives the sling excellent heat resistance and corrosion resistance, while polyester staple fiber improves the sling's softness and wear resistance. The reasonable combination of the two fibers makes the overall woven layer have high strength, durability, and good handling feel. Furthermore, the surface texture created by twill knitting can increase the friction between the sling and the suspended object to a certain extent, further improving the stability and safety of lifting operations. Therefore, the first flat woven layer 11 and the third flat woven layer 13, which are made by blending glass fiber and polyester staple fiber with twill knitting technology, can significantly enhance the overall mechanical properties and service life of the sling, and improve the reliability and economy of lifting operations.

[0023] Preferably, the second flat woven layer 12 comprises warp yarns woven from multiple aramid fiber filaments and weft yarns woven from multiple aramid fiber filaments, which are interwoven in a plain weave pattern. Specifically, during the weaving process, high-strength, high-modulus aramid fiber filaments are selected as raw materials and used to weave the warp and weft yarns respectively, and woven in a plain weave pattern, that is, each warp and weft yarn crosses every other yarn when they intersect, forming a tight and regular fabric structure. The plain weave structure is characterized by dense warp and weft intersections, high fabric flatness, and good overall uniformity, and has superior stability and tear resistance compared to other weaving methods (such as twill or satin). Aramid fiber material itself has extremely high strength, excellent high-temperature resistance, and good wear resistance and cut resistance, which can effectively improve the service life and safety of the sling under high loads and harsh environments. Meanwhile, the plain weave structure ensures more even stress distribution among the fibers, effectively preventing material fatigue or fracture caused by localized stress concentration during lifting operations, thus further enhancing the overall structural strength and impact resistance of the sling. Therefore, the second flat braided layer 12, formed by plain weave of aramid fibers, not only improves the sling's tensile strength and abrasion resistance but also enhances its heat resistance and safety reliability, providing superior performance assurance for the sling under various complex working conditions.

[0024] Preferably, the wear-resistant layer 14 is woven from carbon fiber, Kevlar fiber, or ultra-high molecular weight polyethylene fiber, and is sewn onto the outer side of the first flat woven layer 11, the second flat woven layer 12, and the third flat woven layer 13. These materials possess excellent wear resistance, impact resistance, and chemical corrosion resistance, effectively improving the durability of the sling and preventing surface wear and damage caused by friction and external forces during lifting. The wear-resistant layer 14 is sewn onto the outer side of the first flat woven layer 11, the second flat woven layer 12, and the third flat woven layer 13, forming comprehensive protection for the sling surface. When the sling is used under high loads or in harsh environments, the wear-resistant layer 14 not only provides additional physical protection, reducing wear from external objects, but also maintains the integrity and high performance of the sling during long-term use, extending its service life.

[0025] It should be noted that the combination of the wear-resistant layer 14 with the first flat braided layer 11, the second flat braided layer 12, and the third flat braided layer 13 enhances the overall performance of the flat sling. The glass fiber and polyester staple fiber blended weave of the first and third flat braided layers 11 and 13 gives the sling flexibility and high tensile strength, enabling it to withstand significant bending and tensile stresses during lifting. Meanwhile, the aramid fiber plain weave structure of the second flat braided layer 12 provides the sling with excellent tensile strength, cut resistance, and high-temperature resistance, ensuring its load-bearing capacity in heavy-duty lifting operations. Simultaneously, the wear-resistant layer 14 not only improves the sling's durability but also optimizes the overall structure's impact resistance, allowing the sling to maintain stable performance even in complex and extreme working environments, preventing breakage and damage caused by external impacts and friction, and significantly improving the safety and reliability of lifting operations.

[0026] Preferably, the length adjuster 50 is a length adjusting buckle or a magnetic length adjuster 50. The length adjusting buckle can adopt a buckle structure similar to that commonly found on backpack shoulder straps, featuring simple structure, light weight, and convenient operation. It can achieve quick adjustment and reliable locking of the strap length through manual pressing or sliding. The magnetic length adjuster 50 uses magnets placed at predetermined intervals on the annular flat strap 10 at the large annular structure 30, which are then attracted by the magnets after folding. By setting the length adjuster 50, the local length of one side of the large annular structure 30 can be flexibly adjusted according to actual usage needs. When using the small annular structure 40 for hoisting operations, the length adjuster 50 can be used to appropriately tighten or shorten one side of the large annular structure 30, making its length approximately the same as or slightly larger than that of the small annular structure 40. This avoids the large annular structure 30 being dragged to the ground due to excessive length, causing wear, tangling, knotting, or interference with other parts during hoisting, thereby effectively improving the safety, standardization, and overall efficiency of hoisting operations. The number of length adjusters 50 is determined according to the circumference of the large annular structure 30. Specifically, the number of length adjusters 50 is set to 1 to 3.

[0027] Preferably, the inner covering layer is woven from ultra-high molecular weight polyethylene fiber. After covering the connection point, the inner covering layer is connected to the annular flat sling 10 and the connecting strap 20 by stitching. The outer covering layer is woven from carbon fiber material. After covering the outside of the inner covering layer, the outer covering layer is connected to the inner covering layer, the annular flat sling 10, and the connecting strap 20 by stitching. The double-layer covering layer forms a layered protection system at the connection point. The ultra-high molecular weight polyethylene fiber material of the inner layer, with its excellent cut resistance, abrasion resistance, and high strength, can effectively resist material fatigue and damage caused by bending, pulling, or friction during hoisting operations, improving the overall toughness and service life of the connection point. The carbon fiber material of the outer layer further provides a high-strength protective barrier on the outside, with excellent wear resistance, high temperature resistance, and corrosion resistance. It can resist the erosion and damage to the sling connection point from the external environment (such as sand and gravel friction, mechanical impact, or chemical corrosion), significantly enhancing the stability and safety of the sling under extreme working conditions. The inner and outer covering layers are securely connected to the annular flat sling 10 and connecting strap 20 via stitching. This not only ensures a tight fit between the layers, preventing displacement, warping, or loosening of the covering layers during long-term use, but also further improves the integrity and load-bearing reliability of the sling connection. Consequently, the connection meets flexibility requirements while also possessing excellent durability and high load adaptability, making it particularly suitable for heavy-duty, high-frequency, and harsh environment lifting operations. This significantly extends the sling's service life and reduces maintenance and replacement costs.

[0028] Preferably, the ratio of the circumferences of the two double-ring structures of different sizes is 1:1.2 to 1:2.5. By setting an appropriate circumference ratio for the double-ring structures, the smaller ring structure can adapt to the needs of delicate and localized lifting operations, while the larger ring structure is suitable for scenarios requiring a larger working space or bearing greater weight. When the smaller ring needs to be used for lifting, the larger ring can be appropriately shortened using the length adjuster 50 to avoid problems such as stacking, tangling, or interference with the working space due to excessive length. At the same time, when the larger ring is needed for operation, it can also provide a larger lifting range and load-bearing capacity.

[0029] Preferably, the first flat woven layer 11, the second flat woven layer 12, and the third flat woven layer 13 are knitted together. This not only effectively improves the overall coordination and stress synchronization between the woven layers, avoiding the problem of reduced sling strength caused by delamination and slippage, but also maintains the overall softness and certain extensibility of the sling, allowing it to adapt to the surface shape of the object being lifted during the lifting process, reducing localized stress concentration, and minimizing indentations or damage to the surface of the object being lifted.

[0030] This utility model provides an integrated flat sling with inner and outer double rings. By setting a connecting strap 20 on the annular flat sling 10 and fixing both ends of the connecting strap 20 to the annular flat sling 10, the original single ring structure is divided into two double ring structures of different sizes. This allows the sling to flexibly select the appropriate ring structure for different lifting needs, eliminating the need for frequent changes of slings of different lengths or specifications, greatly improving the convenience and efficiency of lifting operations, and reducing the intensity of manual operation and replacement costs. Secondly, both the annular flat sling 10 and the connecting strap 20 are composed of a first flat braided layer 11, a second flat braided layer 12, and a third flat braided layer 13 stacked together, and a wear-resistant layer 14 is provided around the outside, effectively improving the overall wear resistance and tensile strength of the sling and extending its service life. The three-layer braided structure gives the sling excellent flexibility and high strength, while also distributing the load during lifting, preventing damage or breakage caused by localized stress concentration, thus further improving safety. Secondly, the connecting strap 20 is continuously woven with the annular flat sling 10 at both ends, and two layers are sequentially wrapped around the outside of the connection point, secured by stitching, further enhancing the connection's strength and abrasion resistance, reducing the risk of damage to the connection point during high-load lifting. Simultaneously, the large annular structure 30 is equipped with a length adjuster 50 on the annular flat sling 10, allowing for adjustment of the large annular structure 30 when lifting with the smaller annular structure 40 on one side. This adjusts the length of the large annular structure, preventing problems such as accumulation and tangling caused by excessively long annular structures. Therefore, this integrated flat sling with inner and outer double rings offers advantages such as flexible and convenient use, reliable and secure connection, excellent abrasion and tensile strength, and high operational safety, significantly improving the efficiency and safety of lifting operations and reducing manpower consumption and operational risks caused by frequent sling changes.

[0031] 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 double-loop integrated flat sling, comprising a ring-shaped flat sling and a connecting belt, characterized in that: The ring-shaped flat sling and the connecting band each comprise a first flat woven layer, a second flat woven layer and a third flat woven layer arranged in a stack, and the outer side of the stack is provided with a wear-resistant layer; the two ends of the connecting band are respectively connected to the ring-shaped flat sling to divide the ring-shaped flat sling into two double-ring structures of different sizes, wherein the ring-shaped flat sling of the larger double-ring structure is provided with a length adjuster, the two ends of the connecting band are partially overlapped and continuously woven on the ring-shaped flat sling, and the outer side of the connection is covered with two layers of covering layers from the inside to the outside, and the two layers of covering layers are connected to the connecting band and the ring-shaped flat sling by sewing.

2. The double-ring integrated flat sling according to claim 1, wherein The first flat woven layer and the third flat woven layer each comprise a plurality of warp threads woven by mixing glass fibers and polyester short fibers and a plurality of warp threads woven by mixing glass fibers and polyester short fibers, and the plurality of warp threads and the plurality of weft threads are interwoven in a twill knitting manner.

3. The double-ring integrated flat sling according to claim 1, wherein The second flat woven layer comprises a plurality of warp threads woven by aramid fiber filaments and a plurality of weft threads woven by aramid fiber filaments, and the plurality of warp threads and the plurality of weft threads are interwoven in a plain knitting manner.

4. The double-ring integrated flat sling according to claim 1, wherein The wear-resistant layer is woven by carbon fiber material, Kevlar fiber material or ultra-high molecular weight polyethylene fiber, and the wear-resistant layer is arranged on the outer side of the stack of the first flat woven layer, the second flat woven layer and the third flat woven layer by sewing.

5. The double looped integrated flat sling as claimed in claim 1, wherein, The length adjuster is a length adjustment buckle or a magnetic length adjuster.

6. The double loop integrated flat sling according to claim 1, wherein The number of length adjusters is 1-3.

7. The double looped integrated flat sling as claimed in claim 1, wherein, The inner layer covering layer is woven by ultra-high molecular weight polyethylene fiber, and the inner layer covering layer is connected to the ring-shaped flat sling and the connecting band by sewing after being covered on the connection.

8. The double loop integrated flat sling according to claim 1, wherein The ratio of the circumferences of the two double-ring structures of different sizes is 1:1.2-1:2.

5.

9. The double looped integrated flat sling as claimed in claim 1, wherein, The first flat woven layer, the second flat woven layer and the third flat woven layer are knitted together.

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