A sling stress buffer layer and load equalizing sling

Abstract

The utility model provides a kind of sling stress buffer layer and load uniform sling, it is related to sling technical field.Sling stress buffer layer includes stress buffer cover, energy dissipation zone is provided in stress buffer cover inside, and energy dissipation zone is constituted by multiple flexible filling cavities, short fiber reinforced elastomer is filled in flexible filling cavity, when stress buffer layer is pressed, flexible filling cavity can dissipate and redistribute concentrated stress by the compression of internal filling medium, the energy dissipation zone outer coating of stress buffer cover is wear -resistant rubber, load uniform sling includes sling body, sling body is consolidated as bearing layer, shear layer, wear layer from inside to outside in thickness direction, wear layer outer surface of sling body, still be provided with sling stress buffer cover.The utility model is through detachable stress buffer cover and multilayer composite body structure, improves its overall durability and maintenance convenience under dynamic working condition.

Description

Technical Field

[0001] This utility model relates to the field of sling technology, and in particular to a sling stress buffer layer and a load-distributing sling. Background Technology

[0002] As an important load-bearing and transmission element, slings are widely used in industrial hoisting, transportation, aerospace and emergency rescue and other fields.

[0003] Traditional sling structures often employ a single material or a simple multi-layer composite design, relying primarily on the tensile strength of the fiber weave to bear the load. However, they lack effective stress buffering and distribution mechanisms. Under high load or dynamic impact conditions, the limitations of this structure become particularly prominent: internal stress in the sling is easily concentrated in localized areas, leading to fiber breakage, interface peeling, or accelerated wear. This not only reduces its service life but may also cause sudden damage, creating safety hazards.

[0004] Existing improvement solutions include introducing flexible interlayers or external cushioning components into the sling, such as using closed-cell foam as a shear layer to absorb energy through its porous structure, or adding a cushioning cap to the outside of the sling to provide cushioning through the material's resilience. However, most cushioning layers rely on the plastic deformation or geometric buckling of the material to dissipate energy, which may lead to irreversible damage and poor reusability. Furthermore, traditional filling media, such as ordinary polymers or Newtonian fluids, have limited responsiveness under dynamic loads and are difficult to adapt to varying working conditions. Some cushioning structures have insufficient energy absorption capacity at low strain, requiring higher strain rates to activate effective cushioning, and the interfacial bonding strength between the layers of the sling is insufficient, making them prone to delamination failure under shear stress.

[0005] Therefore, in order to address the above problems, the applicant needs to design a sling stress buffer layer and a load-distributing sling to solve the problem. Utility Model Content

[0006] On one hand, this application provides a sling stress buffer layer, including a stress buffer sleeve. The stress buffer sleeve has at least one energy dissipation zone inside, and the energy dissipation zone is composed of multiple mutually isolated flexible filling cavities. The flexible filling cavities are filled with a compressible filling medium, and the filling medium is a short fiber reinforced elastomer. When the stress buffer sleeve is compressed, the flexible filling cavities can dissipate and redistribute concentrated stress through the compression of the internal filling medium. The outer covering layer of the energy dissipation zone of the stress buffer sleeve is wear-resistant rubber.

[0007] Preferably, the outer surface of the wear-resistant rubber covering layer of the stress buffer sleeve is coated with a wear-resistant coating, and the wear-resistant coating is a ceramic coating. The ceramic coating provides excellent wear resistance and significantly extends the service life of the stress buffer sleeve.

[0008] Preferably, in another aspect, this application also provides a load-distributing sling with a stress buffer layer, comprising a sling body, wherein the sling body is fixed in the thickness direction from the inside out as a load-bearing layer, a shear-resistant layer, and a wear-resistant layer, and a sling stress buffer sleeve is further provided on the outer surface of the wear-resistant layer of the sling body.

[0009] Preferably, the bearing layer is an aramid fiber woven fabric, and the wear-resistant layer is a nylon woven fabric. The aramid fiber woven fabric gives the bearing layer high strength and lightweight properties, while the nylon woven fabric enhances the durability of the wear-resistant layer.

[0010] Preferably, the shear-resistant layer is a flexible polymer with an elastic modulus lower than that of the fiber in the load-bearing layer. The flexible polymer shear-resistant layer with a lower elastic modulus can effectively absorb shear stress and reduce the risk of interlayer delamination.

[0011] Preferably, the flexible polymer is a closed-cell foam sheet, which, as a shear layer, provides good compressibility and energy dissipation while remaining lightweight.

[0012] Preferably, the load-bearing layer, shear layer, and wear-resistant layer are bonded together by hot melt adhesive film. The hot melt adhesive film bonding ensures a strong bond between the load-bearing layer, shear layer, and wear-resistant layer, thereby improving the overall stability of the sling.

[0013] Preferably, the stress-absorbing sleeve is detachably fitted onto the outside of the sling body via Velcro, which allows for quick removal and installation of the stress-absorbing sleeve, facilitating the maintenance and replacement of the sling.

[0014] This utility model provides a sling stress buffer layer and a load-distributing sling, which, compared with the prior art: This utility model employs a detachable stress buffer sleeve with a built-in multi-chamber independently filled structure, which can efficiently dissipate impact energy and redistribute stress, effectively preventing stress concentration. At the same time, its multi-layer composite body, consisting of an aramid fiber load-bearing layer, a closed-cell foam plastic shear-resistant layer, and a nylon wear-resistant layer, is solidified into one piece through a hot-pressing process, combining high load-bearing strength, excellent shear buffering capacity, and durability, thereby improving the safety, service life, and ease of maintenance of the sling under dynamic loads. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the connection structure between the sling body and the stress buffer sleeve of this utility model; Figure 2 This is a cross-sectional view of the stress buffer sleeve according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the layered structure of the sling body according to an embodiment of the present utility model; Figure 4 This is a layered block diagram of the sling body and stress buffer sleeve according to an embodiment of the present utility model.

[0017] icon: 1. Sling body; 2. Stress buffer sleeve; 3. Energy dissipation zone; 4. Flexible filling cavity; 5. Bearing layer; 6. Shear layer; 7. Wear-resistant layer. Detailed Implementation

[0018] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0019] Please refer to Figure 1 and Figure 2 This utility model provides a sling stress buffer layer, including a stress buffer sleeve 2. The stress buffer sleeve 2 has at least one energy dissipation zone 3 inside, and the energy dissipation zone 3 is composed of multiple mutually isolated flexible filling cavities 4. The flexible filling cavities 4 are filled with a compressible filling medium, and the filling medium is a short fiber reinforced elastomer. When the stress buffer sleeve 2 is compressed, the flexible filling cavities 4 can dissipate and redistribute concentrated stress through the compression of the internal filling medium. The outer covering layer of the energy dissipation zone 3 of the stress buffer sleeve 2 is wear-resistant rubber. The multi-cavity independent filling structure can efficiently dissipate impact energy and uniformly distribute stress, reducing the risk of sling fiber breakage due to stress concentration, thereby improving the safety and durability of the sling under dynamic loads.

[0020] In order to extend the service life of the stress buffer sleeve 2, the outer surface of the wear-resistant rubber outer covering layer of the stress buffer sleeve 2 is coated with a wear-resistant coating, and the wear-resistant coating is a ceramic coating, which provides excellent wear resistance.

[0021] Please refer to Figure 3 and Figure 4On the other hand, this application also provides a load-distributing sling, including a sling body 1 which is fixed from the inside to the outside in the thickness direction as a load-bearing layer 5, a shear layer 6, and a wear-resistant layer 7. On the outer surface of the wear-resistant layer 7 of the sling body 1, a sling stress buffer sleeve 2 is also provided. The stress buffer sleeve 2 is detachably fitted onto the outside of the sling body 1 by Velcro. The load-bearing layer 5, the shear layer 6, and the wear-resistant layer 7 are pressed together by a hot melt adhesive film. When in use, this gives the sling higher structural stability and overall load-bearing capacity. The external detachable stress buffer sleeve 2 makes maintenance and replacement convenient, realizing the separation of the core load-bearing and buffering functional modules.

[0022] The load-bearing layer 5 is made of aramid fiber woven fabric, and the wear-resistant layer 7 is made of nylon woven fabric. The aramid fiber provides an extremely high strength-to-weight ratio, ensuring the core load-bearing capacity of the sling, while the nylon woven fabric, with its excellent wear resistance and toughness, effectively protects the internal structure from external damage.

[0023] The shear layer 6 is a flexible polymer with an elastic modulus lower than that of the fiber in the load-bearing layer 5. The flexible polymer is a closed-cell foam plastic sheet. The flexible shear layer 6 effectively relieves interlayer stress and prevents delamination failure. The hot pressing process ensures that the functional layers are tightly bonded, avoids delamination during use, and ensures the long-term integrity of the sling structure.

[0024] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sling stress buffer layer, characterized in that: The system includes a stress buffer sleeve (2), which has at least one energy dissipation zone (3) inside. The energy dissipation zone (3) is composed of multiple mutually isolated flexible filling cavities (4). The flexible filling cavities (4) are filled with a compressible filling medium, which is a short fiber reinforced elastomer. When the stress buffer sleeve (2) is compressed, the flexible filling cavity (4) can dissipate and redistribute the concentrated stress through the compression of the internal filling medium. The outer covering layer of the energy dissipation zone (3) of the stress buffer sleeve (2) is wear-resistant rubber.

2. The sling stress buffer layer according to claim 1, characterized in that: The outer surface of the stress buffer sleeve (2) is coated with a wear-resistant rubber and the wear-resistant coating is a ceramic coating.

3. A load-distributing sling, comprising a sling body (1), characterized in that: The sling body (1) is solidified from the inside to the outside in the thickness direction as a bearing layer (5), a shear layer (6), and a wear-resistant layer (7). On the outer surface of the wear-resistant layer (7) of the sling body (1), a sling stress buffer sleeve (2) as described in any one of claims 1 to 2 is also provided.

4. The load-distributing sling according to claim 3, characterized in that: The bearing layer (5) is an aramid fiber woven fabric, and the wear-resistant layer (7) is a nylon woven fabric.

5. The load-distributing sling according to claim 4, characterized in that: The shear-resistant layer (6) is a flexible polymer with an elastic modulus lower than that of the fiber in the load-bearing layer (5).

6. The load-distributing sling according to claim 5, characterized in that: The flexible polymer is a closed-cell foam plastic sheet.

7. The load-distributing sling according to claim 6, characterized in that: The load-bearing layer (5), shear layer (6) and wear-resistant layer (7) are bonded together by hot melt adhesive film.

8. The load-distributing sling according to claim 3, characterized in that: The stress-relief sleeve (2) is detachably fitted onto the outside of the sling body (1) via Velcro.

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