Industrial hoisting high-strength fiber flat lifting belt

Abstract

The utility model relates to hoist belt technical field discloses industrial hoisting high -strength fiber flat hoist belt, include: aramid fiber braided cover and mixed braided layer, aramid fiber braided cover inside is equipped with mixed braided layer, the mixed braided layer includes intermediate polyester fiber layer and stainless steel fiber braided layer, the mixed braided layer outside is equipped with inner layer polyethylene fiber braided layer, the inner layer polyethylene fiber braided layer outside is equipped with polyurethane coating, aramid fiber braided cover both ends outer wall is equipped with metal nest, the utility model discloses through the mixed braiding of polyester fiber and stainless steel fiber, reduces material cost while keeping performance, through multilayer composite structure and material collaborative design, improved the performance of traditional hoist belt in load, wear resistance, environmental resistance etc.

Description

Technical Field

[0001] This utility model relates to the field of lifting sling technology, specifically to a high-strength fiber flat lifting sling for industrial lifting. Background Technology

[0002] Lifting slings are flexible lifting tools designed specifically for industrial lifting operations. They are typically woven from high-strength synthetic fibers and other materials, and have a flat, strip-like structure.

[0003] For example, an existing Chinese patent (CN214727119U) discloses a flat double-buckle lifting sling, including a lifting sling and an adhesive cloth. The outer layer of the lifting sling has a wear-resistant layer, the bottom layer of the wear-resistant layer has a waterproof layer, the bottom layer of the waterproof layer has a fireproof layer, and the bottom layer of the fireproof layer has a support middle layer. Limit sleeves are connected to both sides of the lifting sling, and a lifting lug is connected to one end of the limit sleeve. The outer end of the lifting lug is wrapped with a lifting lug sheath, and the inner layer of the lifting lug sheath has anti-slip protrusions. A buffer post is connected between the lifting sling and the limit sleeve, and a spring is provided at the outer end of the buffer post. A packing rope is connected to one side of the lifting sling, and a fixing adhesive is connected to one end of the packing rope. By providing a wear-resistant layer on the outer surface of the lifting sling, its safety during long-term lifting is improved, making the equipment safer to use.

[0004] In modern logistics and cargo handling, the demand for handling equipment is increasing, especially for conveyor belts that can withstand high loads, have good wear resistance, and ensure operational safety. Traditional flat lifting slings, due to material limitations, often cannot meet these requirements, and their safety and durability cannot be guaranteed. Utility Model Content

[0005] The purpose of this invention is to provide a high-strength fiber flat lifting sling for industrial lifting, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-strength fiber flat lifting sling for industrial lifting, comprising: an aramid fiber braided sleeve and a mixed braided layer, wherein the aramid fiber braided sleeve has a mixed braided layer inside, the mixed braided layer comprising an intermediate polyester fiber layer and a stainless steel fiber braided layer, an inner polyethylene fiber braided layer is provided on the outside of the mixed braided layer, the outer side of the inner polyethylene fiber braided layer is provided with a polyurethane coating, and metal nesting is provided on the outer walls of both ends of the aramid fiber braided sleeve.

[0007] Furthermore, the metal nest has recessed grooves on both the upper and lower sides, and one side of the groove can abut against the aramid fiber woven sleeve.

[0008] Furthermore, an end protective layer is provided between the metal nested inner wall and the aramid fiber woven sleeve, and the end protective layer is made of aramid fiber.

[0009] Furthermore, the aramid fiber braided sleeve has end epoxy resin at both ends.

[0010] Furthermore, the intermediate polyester fiber layer and the stainless steel fiber woven layer are cross-woven in a mesh pattern.

[0011] Furthermore, a resin bonding layer is provided between the intermediate polyester fiber layer and the stainless steel fiber braided layer.

[0012] Furthermore, the inner polyethylene fiber braided layer has a parallel braided structure.

[0013] Furthermore, the inner polyethylene fiber braided layer is located inside the aramid fiber braided sleeve, and the polyurethane coating thickness is 0.2-0.5 mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention utilizes aramid and polyethylene fibers to provide a high-strength base load-bearing capacity. The hybrid woven layer of stainless steel and polyester fibers, optimized through three-dimensional stress distribution, enhances the breaking load compared to traditional polyester lifting slings. A polyurethane coating reduces surface wear; stainless steel fibers prevent internal cutting damage; and end protection layers and epoxy resin eliminate weak points at the ends, extending the sling's service life. The rigid-flexible transition design between the metal nesting and fiber layers balances high load-bearing capacity with operational flexibility. The hybrid weaving of polyester and stainless steel fibers reduces material costs while maintaining performance; and the multi-layered composite structure and synergistic material design improve the load-bearing capacity, abrasion resistance, and environmental resistance of traditional lifting slings.

[0016] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0017] Figure 1 This is a perspective view of the high-strength fiber flat lifting sling for industrial lifting according to this utility model;

[0018] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0019] Figure 3 This is a perspective view of the high-strength fiber flat lifting sling for industrial lifting according to this utility model.

[0020] Figure 4 for Figure 3 Enlarged structural diagram at point B;

[0021] Figure 5 This is the front view of the high-strength fiber flat lifting sling for industrial lifting according to this utility model.

[0022] In the diagram: 1. Aramid fiber braided sleeve; 2. Metal nest; 3. Groove; 4. Polyurethane coating; 5. Inner polyethylene fiber braided layer; 6. Middle polyester fiber layer; 7. Resin bonding layer; 8. Stainless steel fiber braided layer; 9. End epoxy resin; 10. End protective layer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figures 1-5 This utility model provides a technical solution: a high-strength fiber flat lifting sling for industrial lifting, comprising: an aramid fiber braided sleeve 1 and a mixed braided layer. The aramid fiber braided sleeve 1 serves as the outermost structure of the lifting sling, encasing all internal functional layers. The tensile strength of aramid fiber is 5-6 times that of steel, effectively resisting puncture and tearing by sharp external objects and protecting the internal structure. Its density is only 1 / 5 that of steel, reducing the sling's weight while maintaining strength and improving lifting efficiency. Aramid fiber exhibits excellent resistance to acids, alkalis, and organic solvents, making it suitable for harsh environments such as chemical and marine environments. The end epoxy resin 9 is cured and bonded to the metal nest 2 to form an integral structure; internally, it is tightly bonded to the inner polyethylene fiber braided layer 5 through a pressing process to prevent interlayer slippage.

[0025] The aramid fiber braided sleeve 1 has an internal hybrid braided layer, comprising an intermediate polyester fiber layer 6 and a stainless steel fiber braided layer 8. An inner polyethylene fiber braided layer 5 is located outside the hybrid braided layer, and a polyurethane coating 4 is applied to the outer side of the inner polyethylene fiber braided layer 5. Metal nests 2 are located on the outer walls at both ends of the aramid fiber braided sleeve 1. The intermediate polyester fiber layer 6 is one of the core load-bearing layers of the hybrid braided layer, and it is cross-woven with the stainless steel fiber braided layer 8 in a mesh pattern. The elongation at break of the polyester fiber reaches 15%-30%, which can absorb dynamic load impacts and prevent the stainless steel fiber 8 from brittle fracture due to excessive rigidity. The price of polyester fiber is only 1 / 3 that of aramid fiber; the hybrid braiding reduces material costs while maintaining overall strength. The polyester fiber and stainless steel fiber are cross-woven at a 45° angle, forming a three-dimensional structure that ensures uniform stress distribution within the layers and avoids localized overload. The stainless steel fiber has a hardness of HRc50-55, which can withstand the cutting of sharp objects such as metal shavings and glass, making it suitable for high-risk scenarios such as metallurgy and glass processing. Stainless steel has a melting point exceeding 1400℃, maintaining structural integrity even in high-temperature environments. Optional 316L stainless steel fiber provides anti-static properties, making it suitable for flammable and explosive environments. The cross-weaving technique combines the rigidity of stainless steel with the toughness of polyester, achieving a composite performance that balances rigidity and flexibility.

[0026] The metal nest 2 has recessed grooves 3 on both its upper and lower sides, one side of which abuts against the aramid fiber braided sleeve 1. The metal nest 2 is located at both ends of the aramid fiber braided sleeve 1, serving as a rigid interface for connecting the lifting sling to the lifting equipment. The metal material provides rigid support, dispersing concentrated stress at the ends of the lifting sling and preventing breakage due to flexible deformation. The recessed grooves 3 on both the upper and lower sides of the metal nest 2 abut against the outer wall of the aramid fiber braided sleeve 1. The grooves 3 enhance the friction between the metal and the fiber layer through mechanical interlocking, preventing the lifting sling from slipping out of the nest under load; simultaneously, the grooves 3 disperse localized stress, preventing the metal edges from cutting the fibers.

[0027] An end protective layer 10, made of aramid fiber, is provided between the inner wall of the metal nest 2 and the aramid fiber braided sleeve 1. The flexibility of the aramid fiber buffers the rigid contact between the metal and the fiber, reducing end wear; at the same time, its high strength prevents the metal nest 2 from tearing the outer aramid sleeve 1 during repeated bending. The gap between the metal nest 2 and the fiber layer is filled with epoxy resin 9 at the ends, achieving a transitional bonding between the rigid and flexible structures and ensuring uniform load transfer.

[0028] The aramid fiber braided sleeve 1 has epoxy resin 9 at both ends. The epoxy resin 9 fills the contact surfaces between the aramid fiber braided sleeve 1 and the metal nest 2 at both ends. The shear strength of the epoxy resin can reach 20-30 MPa, which can firmly bond the metal nest 2 to the aramid fiber braided sleeve 1 and prevent end delamination. The epoxy resin has excellent water resistance, oil resistance, and UV resistance, ensuring that the lifting sling maintains its bonding strength after long-term outdoor use. By filling the tiny gaps between the fiber layer and the metal, local stress concentration is eliminated, improving the fatigue resistance of the ends.

[0029] The intermediate polyester fiber layer 6 and the stainless steel fiber braided layer 8 are cross-woven in a mesh pattern. A resin bonding layer 7 is provided between the intermediate polyester fiber layer 6 and the stainless steel fiber braided layer 8. Epoxy resin is filled at the intersections to enhance the bond strength between the fibers and prevent the braided layer from loosening. The resin bonding layer 7 is filled at the intersections of the intermediate polyester fiber layer 6 and the stainless steel fiber braided layer 8. The cross-woven fibers are locked by curing, preventing the braided layer from shifting during repeated bending or vibration. The elastic modulus of the resin is between that of polyester and stainless steel, which can smoothly transfer stress and reduce fretting wear between fibers. High-temperature resistant epoxy resin is selected to ensure that the bond strength is maintained in an environment ranging from -50℃ to 150℃.

[0030] The inner polyethylene fiber braided layer 5 has a parallel woven structure. Located between the polyurethane coating 4 and the mixed braided layer, the inner polyethylene fiber braided layer 5 employs a parallel woven structure. The modulus of polyethylene fibers is three times that of polyester, providing rigid support for the lifting sling and reducing lateral deformation. The parallel arrangement ensures uniform strength distribution of the fibers in both the longitudinal and transverse directions, avoiding localized weaknesses caused by directionality. The parallel structure complements the mesh-like cross structure of the mixed braided layer, enhancing interlayer friction and preventing separation between the coating 4 and the mixed layer. It is bonded to the intermediate polyester fiber layer 6 via a resin adhesive layer 7, forming a composite structure.

[0031] The inner polyethylene fiber braided layer 5 is located inside the aramid fiber braided sleeve 1, and the polyurethane coating 4 has a thickness of 0.2-0.5mm. The polyurethane has a Shore A hardness of 80-90, effectively resisting surface friction and scratches, extending the service life of the lifting sling. The coating seals the pores on the fiber surface, preventing moisture and corrosive substances from penetrating the interior and protecting the mechanical properties of the mixed braided layers 6 and 8. It reduces the coefficient of friction between the lifting sling and the load, facilitating sliding and position adjustment, while also reducing the risk of friction injury to the operator's hands. A dense protective layer is formed by uniformly covering the fiber surface through spraying or impregnation processes.

[0032] This invention utilizes aramid and polyethylene fibers to provide a high-strength base load-bearing capacity. The hybrid woven layer of stainless steel and polyester fibers, optimized through three-dimensional stress distribution, enhances the breaking load compared to traditional polyester lifting slings. A polyurethane coating reduces surface wear; stainless steel fibers prevent internal cutting damage; and end protection layers and epoxy resin eliminate weak points at the ends, extending the sling's service life. The rigid-flexible transition design between the metal nesting and fiber layers balances high load-bearing capacity with operational flexibility. The hybrid weaving of polyester and stainless steel fibers reduces material costs while maintaining performance; and the multi-layered composite structure and synergistic material design improve the load-bearing capacity, abrasion resistance, and environmental resistance of traditional lifting slings.

[0033] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. High-strength fiber flat lifting slings for industrial lifting, including: The aramid fiber braided sleeve (1) and the mixed braided layer are characterized in that: the aramid fiber braided sleeve (1) is provided with a mixed braided layer inside, the mixed braided layer includes an intermediate polyester fiber layer (6) and a stainless steel fiber braided layer (8), the mixed braided layer is provided with an inner polyethylene fiber braided layer (5) on the outside, the inner polyethylene fiber braided layer (5) is provided with a polyurethane coating (4) on the outside, and the outer walls at both ends of the aramid fiber braided sleeve (1) are provided with metal nests (2).

2. The industrial lifting high-strength fiber flat sling according to claim 1, characterized in that: The metal nest (2) has recessed grooves (3) on both the upper and lower sides, and one side of the groove (3) can abut against the aramid fiber braided sleeve (1).

3. The industrial lifting high-strength fiber flat sling according to claim 2, characterized in that: An end protection layer (10) is provided between the inner wall of the metal nest (2) and the aramid fiber braided sleeve (1), and the end protection layer (10) is made of aramid fiber.

4. The industrial lifting high-strength fiber flat sling according to claim 1, characterized in that: The aramid fiber braided sleeve (1) has end epoxy resin (9) at both ends.

5. The industrial lifting high-strength fiber flat sling according to claim 1, characterized in that: The intermediate polyester fiber layer (6) and the stainless steel fiber braided layer (8) are cross-woven in a mesh pattern.

6. The industrial lifting high-strength fiber flat sling according to claim 5, characterized in that: A resin bonding layer (7) is provided between the intermediate polyester fiber layer (6) and the stainless steel fiber braided layer (8).

7. The industrial lifting high-strength fiber flat sling according to claim 1, characterized in that: The inner polyethylene fiber braided layer (5) has a parallel braided structure.

8. The industrial lifting high-strength fiber flat sling according to claim 1, characterized in that: The inner polyethylene fiber braided layer (5) is located inside the aramid fiber braided sleeve (1), and the polyurethane coating (4) has a thickness of 0.2-0.5 mm.

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