Traction steel wire rope with ultra-high molecular weight core for elevator and processing method of traction steel wire rope

Abstract

The invention discloses a traction steel wire rope with an ultra-high molecular weight core for an elevator and a processing method, the traction steel wire rope comprises a rope core, and the rope core is an ultra-high molecular weight polyethylene composite core; the multiple strand structures are arranged on the outer side of the rope core, and any strand structure comprises a center steel wire, inner-layer steel wires arranged on the outer side of the center steel wire and distributed in an annular array, and outer-layer steel wires arranged on the outer sides of the inner-layer steel wires and distributed in an annular array; the filling layer is arranged between the rope core and the plurality of strand structures; the ultrahigh-molecular-weight polyethylene composite core has the beneficial effects that through the multi-layer structural design of the ultrahigh-molecular-weight polyethylene composite core, the outer 19S-shaped strand structure and the ultrahigh-molecular-weight polyethylene filling layer are cooperated, and synchronous optimization of strength, torsion prevention and fatigue life is achieved; the low-twist yarn center layer in the composite core reduces residual torsional stress, the steel wire woven mesh enhances compression resistance and shear resistance, the mixed woven layer improves interface friction force and creep resistance, and the filling layer in interference fit between the core strands is matched, so that core layer movement and core strand separation are effectively avoided.

Description

Technical Field

[0001] This invention belongs to the field of traction steel wire rope technology, specifically relating to a traction steel wire rope for elevators with ultra-high molecular weight polymer core and its processing method. Background Technology

[0002] With the rapid popularization of high-rise and super high-rise buildings in cities, the operating speed and lifting height of elevators continue to increase, which puts forward more stringent requirements on the performance of traction steel wire ropes: on the one hand, they need to meet the requirements of low elastic elongation and high load-bearing strength to ensure the accuracy and safety of elevator operation; on the other hand, they need to have the characteristics of long fatigue life and low maintenance cost to adapt to the high-frequency operation scenarios of high-rise elevators.

[0003] Traditional elevator traction steel wire ropes are mainly divided into two categories: one is hemp-core steel wire rope, with sisal core as a typical example. Using natural plant fibers as the core, although the cost is lower, natural fibers are highly hygroscopic, making them prone to mold growth and strength reduction due to moisture. They also have a low modulus of elasticity and a large elongation, which can easily lead to car vibration and reduced leveling accuracy during high-speed operation. According to laboratory test data, the fatigue life of sisal core steel wire rope is approximately 1.2 to 1.5 million cycles, while elevators actually need to withstand 1.5 million cycles during operation. The requirement of approximately 2 million start-stop cycles makes sisal core steel wire ropes unsuitable for the long-term service requirements of elevators, necessitating frequent replacements. The second option is all-steel core steel wire rope, which uses steel strands as the core, significantly improving strength and elastic modulus. However, it suffers from excessive weight and insufficient impact resistance. Furthermore, the contact friction between the steel core and the outer steel wires can accelerate wear, leading to the risk of wire breakage and strand disintegration after long-term use. Especially under the start-stop impact conditions of high-rise, high-speed elevators, its structural stability is insufficient to meet long-term operational requirements.

[0004] In recent years, some ultra-high molecular weight polyethylene (UHMWPE) core steel wire ropes have been gradually applied in the elevator field. Utilizing the low friction and high wear resistance of UHMWPE, the defects of traditional rope cores have been improved to some extent. However, existing products still have core technological shortcomings: First, the bonding tightness between the rope core and the outer steel wire strands is insufficient, and the core layer is prone to "shifting," leading to a decrease in the overall torsional stiffness of the steel wire rope and easy rotational deviation during operation. Second, the core structure is simple, using only pure UHMWPE fiber twisting. Although it has low friction characteristics, its resistance to compression and shear under load conditions is insufficient, making it difficult to cooperate with the outer steel wires in bearing the load, thus limiting the overall strength of the steel wire rope. Third, anti-torsion design is lacking. Most products use a unidirectional twisting structure, which easily generates residual torsional stress under tension, which, over a long period, will exacerbate fatigue damage to the steel wires and shorten their service life. Therefore, developing an UHMWPE core elevator traction steel wire rope that combines high strength, low elastic elongation, excellent anti-torsion performance, and long fatigue life has become a key technological requirement in the elevator traction component field.

[0005] The processing technology of steel wire rope directly determines its final performance. The processing flow of traditional hemp core or all-steel core steel wire rope is no longer suitable for the structural characteristics of ultra-high molecular weight polyethylene (UHMWPE) core steel wire rope. There are several technical bottlenecks in the current processing of UHMWPE core steel wire rope: First, the core preparation process is rough. Most of them simply twist UHMWPE fibers without structural reinforcement for the load-bearing characteristics of the core layer. This results in low core density and poor compression resistance. During subsequent rope assembly and use, the core layer is prone to deformation and collapse, which affects the overall structural stability of the steel wire rope. At the same time, the interface treatment between the core layer and the outer steel wire strands is insufficient. The surface of pure UHMWPE fibers is smooth and has low friction with the steel wires. After rope assembly, core strand separation and relative slippage are prone to occur, which greatly reduces the load-bearing efficiency of the steel wire rope.

[0006] Secondly, there are defects in the pretreatment process of steel wire. Although traditional pickling and galvanizing processes can improve the corrosion resistance of steel wire, the bonding force between the galvanized layer and the steel wire substrate is insufficient. During twisting and use, the coating is prone to peeling off. In addition, the surface of the steel wire is not reinforced and modified, which leads to increased wear between the steel wire and the core layer and between the steel wires, shortening the fatigue life. Although some processes use oiling treatment, ordinary mineral oil has poor adhesion and is easy to run off during high-speed operation, and cannot maintain the lubrication effect for a long time.

[0007] Furthermore, the twisting and stress relief processes are inadequate: First, the twisting parameters are poorly matched. Most products use a single twist direction or fixed twist pitch, without considering the structural characteristics of the core layer and strand layer for reverse twisting design, resulting in high residual torsional stress in the wire rope and insufficient anti-torsion performance. Second, there is a lack of effective compaction treatment during the twisting process, resulting in insufficient tightness of the wire strands and wire rope, which easily leads to structural loosening under load. Third, stress relief is incomplete. Traditional natural aging stress relief methods are inefficient and ineffective. The internal stress generated during the twisting process is easily released gradually during subsequent use, causing fluctuations in the elastic deformation of the wire rope and fatigue damage.

[0008] In addition, the existing processing technology has not optimized the heat setting for the material characteristics of the ultra-high molecular weight polyethylene core. Ultra-high molecular weight polyethylene fiber has strong thermoplasticity. If the heat setting temperature and time are not properly controlled, the core fiber is prone to thermal degradation or excessive shrinkage, which affects the mechanical properties of the core layer. At the same time, the surface treatment process after rope bonding is simple, using only ordinary coatings, which are not wear-resistant or weather-resistant enough to adapt to the complex operating environment of high-rise elevators. Summary of the Invention

[0009] The purpose of this invention is to provide a traction steel wire rope for elevators with ultra-high molecular weight polymer core and a processing method thereof. Through structural optimization, it achieves high strength, low elastic elongation and anti-torsion performance, while extending fatigue life. Through step-by-step twisting, heat setting and stress relief processes, the strength and structural stability of the steel wire rope are improved.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a traction steel wire rope for an ultra-high molecular weight polymer (UHMWPE) elevator, comprising... The rope core is an ultra-high molecular weight polyethylene composite core; Multiple strand structures disposed on the outside of the rope core, each of the strand structures including a central steel wire, an inner layer of steel wires disposed in a ring array outside the central steel wire, and an outer layer of steel wires disposed in a ring array outside the inner layer of steel wire. A filling layer placed between the rope core and multiple strands.

[0011] As a preferred technical solution of the present invention, the rope core is composed of a central layer formed by twisting low-twist yarns of ultra-high molecular weight polyethylene fibers, and an outer layer consisting of a steel wire braided mesh and a mixed polymer braided layer.

[0012] As a preferred embodiment of the present invention, the mixed polymer woven layer is made of polyester, nylon and ultra-high molecular weight polyethylene fibers twisted together, and the filling layer is an ultra-high molecular weight polyethylene wear-resistant filler strip.

[0013] A method for processing traction steel wire rope for elevators with ultra-high molecular weight polymer cores includes the following steps: Step 1: Preparation of ultra-high molecular weight polyethylene composite core. The low-twist yarn of ultra-high molecular weight polyethylene fiber is twisted into a core layer, wrapped around a steel wire woven mesh, and then twisted with a mixed polymer woven layer. After heat setting and compaction treatment. Step 2: Steel wire pretreatment. Carbon steel is pickled, drawn, and then galvanized. The secondary drawing compression rate is 80-90%. Then it is immersed in water-based epoxy resin emulsion and dried. Step 3: Steel wire strand twisting. The pretreated steel wires are arranged in a 19S structure and twisted in a right-hand twisting manner. The compression rate during twisting is 8~10%. Oil is applied simultaneously and stress is relieved by a deformer. Step 4: Filler strip setting. The ultra-high molecular weight polyethylene filler strip is embedded into the preset groove around the composite core, and the groove and the filler strip are interference fit. Step 5: Rope twisting. Arrange multiple steel wire strands around the composite core in a left-hand twist. Use a roller compactor for pre-compression during twisting, and control the twist ratio to be 6~7. Step 6: Heat setting treatment. Heat set the wire rope after rope bonding at 110~130℃ for 30~45 minutes, and apply 0.5~1% pre-tension simultaneously. Step 7: Surface treatment. Apply an ultra-high molecular weight polyethylene wear-resistant coating to the outer layer of the steel wire rope. The coating thickness is 0.1~0.3mm. After curing, rewind the wire rope.

[0014] As a preferred technical solution of the present invention, in step one, the heating rate of heat setting is 5℃ / min, and after heat preservation, it is naturally cooled to room temperature.

[0015] As a preferred technical solution of the present invention, in step two, the number of drawing passes in the secondary drawing is 8 to 10, the drawing temperature is controlled at 160 to 170°C, and the drawing speed is 4 to 5 m / s.

[0016] As a preferred technical solution of the present invention, in step three, the deformer is a double-roller structure, and the roller spacing is 1.2 to 1.5 times the diameter of the steel wire strand.

[0017] As a preferred technical solution of the present invention, in step five, the compaction pressure of the roller compactor is 5~8MPa, and the number of compaction times is 2~3 times.

[0018] As a preferred technical solution of the present invention, in step seven, the wear-resistant coating is applied by mixing and melting ultra-high molecular weight polyethylene particles and EVA hot melt adhesive at a mass ratio of 9:1.

[0019] Compared with the prior art, the beneficial effects of the present invention are: This invention achieves simultaneous optimization of strength, torsion resistance, and fatigue life through a multi-layered structure design of ultra-high molecular weight polyethylene composite core, in conjunction with an outer 19S strand structure and an ultra-high molecular weight polyethylene filler layer. The low-twist yarn center layer in the composite core reduces residual torsional stress, the steel wire braided mesh enhances compression and shear resistance, and the mixed braided layer improves interfacial friction and creep resistance. Combined with the interference fit filler layer between the core strands, it effectively prevents core layer movement and core strand separation, making the elastic modulus of the wire rope similar to that of an all-steel core, and the fatigue life 3 to 5 times that of ordinary hemp core wire rope. By combining the composite core low-twist structure with stress relief technology during processing, the rotational offset of the wire rope during operation is reduced by more than 40%, meeting the stringent requirements for operational stability of high-rise and high-speed elevators. The step-by-step heat setting process after the core layer and the rope are optimized to avoid fiber thermal degradation or excessive shrinkage; the strength of the steel wire and the adhesion of the coating are improved by secondary drawing of steel wire, water-based epoxy resin pretreatment and stress relief by double roller deformer, and the risk of wear and wire breakage is reduced. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an enlarged schematic diagram of the strand structure of the present invention; Figure 3 This is a flowchart of the processing method for ultra-high molecular weight polymer core elevator traction steel wire rope of the present invention; In the picture: 1. Rope core; 2. Strand structure; 21. Center steel wire; 22. Inner steel wire; 23. Outer steel wire; 3. Filling layer. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 Please see Figures 1 to 3 This is the first embodiment of the present invention, which provides a traction steel wire rope for an elevator with an ultra-high molecular weight polymer core, comprising: Rope core 1 is an ultra-high molecular weight polyethylene composite core. Compared with traditional hemp cores or single ultra-high molecular weight polyethylene cores, ultra-high molecular weight polyethylene composite cores can take into account low friction and high wear resistance, providing basic impact resistance and chemical resistance support for steel wire ropes. Multiple strand structures 2 are arranged on the outside of the rope core 1. Each strand structure 2 includes a central steel wire 21, an inner layer steel wire 22 arranged in a ring array outside the central steel wire 21, and an outer layer steel wire 23 arranged in a ring array outside the inner layer steel wire 22. The ring array structure can make the strand structure 2 bear the force evenly, improve the load-bearing strength of a single strand, and reduce local wear between steel wires. The filling layer 3 is set between the rope core 1 and the multiple strand structures 2. The filling layer 3 can fill the gap between the rope core and the strand structures 2, reduce the "movement" of the strand structures 2 relative to the rope core 1, and improve the overall structural compactness of the wire rope.

[0023] In this embodiment, the rope core 1 is composed of a central layer formed by twisting low-twist yarns of ultra-high molecular weight polyethylene fibers, and an outer layer consisting of a steel wire braided mesh and a mixed polymer braided layer. The low-twist yarn central layer can reduce the residual torsional stress of the core layer; the steel wire braided mesh can enhance the compression and shear resistance of the rope core 1; and the mixed braided layer can increase the interfacial friction between the rope core and the strand structure 2, thus preventing core-strand separation.

[0024] In this embodiment, the mixed polymer braided layer is made of polyester, nylon and ultra-high molecular weight polyethylene fiber mixed and twisted. Polyester improves heat resistance and nylon enhances toughness. When combined with ultra-high molecular weight polyethylene fiber, it can make up for the insufficient creep resistance of single ultra-high molecular weight polyethylene material and further extend the service life of the rope core 1. The filling layer 3 is an ultra-high molecular weight polyethylene wear-resistant filler strip. The wear-resistant properties of the ultra-high molecular weight polyethylene filler strip can reduce the friction loss between the rope core 1 and the strand structure 2. At the same time, its elasticity can buffer the impact load during operation and improve the fatigue life of the wire rope.

[0025] A method for processing traction steel wire rope for elevators with ultra-high molecular weight polymer cores includes the following steps: Step 1: Preparation of ultra-high molecular weight polyethylene composite core. Low-twist yarn of ultra-high molecular weight polyethylene fiber is twisted into a core layer, wrapped with steel wire woven mesh, and then twisted with mixed polymer woven layer. After heat setting and compaction treatment, the heating rate of heat setting is 5℃ / min, and after heat holding, it is naturally cooled to room temperature. Step 2: Steel wire pretreatment. Carbon steel is pickled, drawn, and then galvanized. The secondary drawing compression rate is 80%. It is then immersed in water-based epoxy resin emulsion and dried. The secondary drawing process consists of 8 drawing passes, with the drawing temperature controlled at 160℃ and the drawing speed at 4m / s. Step 3: Wire strand twisting. The pretreated steel wires are arranged in a 19S structure and twisted in a right-hand twisting manner. The compression rate during twisting is 8%. Oil is applied simultaneously and stress is relieved by a deformer. The deformer is a double-roller structure with a roller spacing of 1.2 times the diameter of the wire strand. Step 4: Filler strip setting. The ultra-high molecular weight polyethylene filler strip is embedded into the preset groove around the composite core, and the groove and the filler strip are interference fit. Step 5: Rope twisting. Arrange multiple steel wire strands around the composite core in a left-hand twist. Use a roller compactor for pre-compaction during twisting, controlling the twist ratio to be 6. The compaction pressure of the roller compactor is 5MPa, and the number of compaction times is 2. Step 6: Heat setting treatment. The wire rope after being combined is heat set at 110℃ for 45 minutes, and 0.5% pre-tension is applied simultaneously. Step 7: Surface treatment. Apply an ultra-high molecular weight polyethylene (UHMWPE) wear-resistant coating to the outer layer of the steel wire rope. The wear-resistant coating is made by mixing and melting UHMWPE particles and EVA hot melt adhesive at a mass ratio of 9:1 and then applying the coating. The coating thickness is 0.1 mm. After curing, the wire rope is rolled up.

[0026] Example 2 Please see Figures 1 to 3 This is the second embodiment of the present invention, which is based on the previous embodiment, but differs in that: A method for processing traction steel wire rope for elevators with ultra-high molecular weight polymer cores includes the following steps: Step 1: Preparation of ultra-high molecular weight polyethylene composite core. Low-twist yarn of ultra-high molecular weight polyethylene fiber is twisted into a core layer, wrapped with steel wire woven mesh, and then twisted with mixed polymer woven layer. After heat setting and compaction treatment, the heating rate of heat setting is 5℃ / min, and after heat holding, it is naturally cooled to room temperature. Step 2: Steel wire pretreatment. Carbon steel is pickled, drawn, and then galvanized. The secondary drawing compression rate is 85%. It is then immersed in water-based epoxy resin emulsion and dried. The secondary drawing process consists of 9 drawing passes, with the drawing temperature controlled at 165℃ and the drawing speed at 4.5m / s. Step 3: Wire strand twisting. The pretreated steel wires are arranged in a 19S structure and twisted in a right-hand twisting manner. The compression rate during twisting is 9%. Oil is applied simultaneously and stress is relieved by a deformer. The deformer is a double-roller structure with a roller spacing of 1.4 times the diameter of the wire strand. Step 4: Filler strip setting. The ultra-high molecular weight polyethylene filler strip is embedded into the preset groove around the composite core, and the groove and the filler strip are interference fit. Step 5: Rope twisting. Arrange multiple steel wire strands around the composite core in a left-hand twist. Use a roller compactor for pre-compaction during twisting, and control the twist ratio to be 6.5. The compaction pressure of the roller compactor is 7MPa, and the number of compaction times is 3. Step 6: Heat setting treatment. The wire rope after being combined is heat set at 120℃ for 37 minutes, and 0.8% pre-tension is applied simultaneously. Step 7: Surface treatment. Apply an ultra-high molecular weight polyethylene (UHMWPE) wear-resistant coating to the outer layer of the steel wire rope. The wear-resistant coating is made by mixing UHMWPE particles and EVA hot melt adhesive at a mass ratio of 9:1 and then applying the coating. The coating thickness is 0.2 mm. After curing, the wire rope is rolled up.

[0027] Example 3 Please see Figures 1 to 3 This is the third embodiment of the present invention, which is based on the previous embodiment, but differs in that: A method for processing traction steel wire rope for elevators with ultra-high molecular weight polymer cores includes the following steps: Step 1: Preparation of ultra-high molecular weight polyethylene composite core. Low-twist yarn of ultra-high molecular weight polyethylene fiber is twisted into a core layer, wrapped with steel wire woven mesh, and then twisted with mixed polymer woven layer. After heat setting and compaction treatment, the heating rate of heat setting is 5℃ / min, and after heat holding, it is naturally cooled to room temperature. Step 2: Steel wire pretreatment. Carbon steel is pickled, drawn, and then galvanized. The secondary drawing compression rate is 90%. It is then immersed in water-based epoxy resin emulsion and dried. The secondary drawing process consists of 10 drawing passes, with the drawing temperature controlled at 170℃ and the drawing speed at 5m / s. Step 3: Wire strand twisting. The pretreated steel wires are arranged in a 19S structure and twisted in a right-hand twisting manner. The compression rate during twisting is 10%. Oil is applied simultaneously and stress is relieved by a deformer. The deformer is a double-roller structure with a roller spacing of 1.5 times the diameter of the wire strand. Step 4: Filler strip setting. The ultra-high molecular weight polyethylene filler strip is embedded into the preset groove around the composite core, and the groove and the filler strip are interference fit. Step 5: Rope twisting. Arrange multiple steel wire strands around the composite core in a left-hand twist. Use a roller compactor for pre-compression during twisting, and control the twist ratio to be 7. The compaction pressure of the roller compactor is 8MPa, and the number of compaction times is 3. Step 6: Heat setting treatment. Heat set the wire rope after rope bonding at 130℃ for 30 minutes, and apply 1% pre-tension simultaneously. Step 7: Surface treatment. Apply an ultra-high molecular weight polyethylene (UHMWPE) wear-resistant coating to the outer layer of the steel wire rope. The wear-resistant coating is made by mixing and melting UHMWPE particles and EVA hot melt adhesive at a mass ratio of 9:1 and then applying the coating. The coating thickness is 0.3 mm. After curing, the wire rope is rolled up.

[0028] Although embodiments of the invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ultra-high molecular weight elevator hoisting steel wire rope, characterized by: Comprising a rope core (1) which is an ultra-high molecular weight polyethylene composite core; a plurality of strand structures (2) arranged outside the rope core (1), each of the strand structures (2) comprising a center steel wire (21), an inner layer steel wire (22) arranged outside the center steel wire (21) in a ring array, and an outer layer steel wire (23) arranged outside the inner layer steel wire (22) in a ring array; a filling layer (3) arranged between the rope core (1) and the plurality of strand structures (2).

2. The ultra-high molecular weight core elevator hoisting wire rope according to claim 1, characterized in that: The rope core (1) is twisted from an ultra-high molecular weight polyethylene fiber low twist yarn to form a center layer, and is composed of an outer layer of a steel wire woven mesh and a mixed polymer woven layer.

3. The ultra-high molecular weight core elevator hoisting wire rope according to claim 2, characterized in that: The mixed polymer woven layer is twisted from polyester, nylon and ultra-high molecular weight polyethylene fiber, and the filling layer (3) is an ultra-high molecular weight polyethylene wear-resistant filling strip.

4. The processing method of the super high molecular core elevator hoisting steel wire rope according to any one of claims 1-3, characterized in that: Comprising the following steps: Step one: ultra-high molecular composite core preparation, twisting ultra-high molecular weight polyethylene fiber low twist yarn into a center layer, wrapping a steel wire woven mesh, and twisting with a mixed polymer woven layer, heat setting and compaction treatment; Step two: steel wire pretreatment, galvanizing after pickling and drawing of carbon steel, secondary drawing compression ratio of 80~90%, then immersed in water-based epoxy resin emulsion and dried; Step three: steel wire strand twisting, arranging the pretreated steel wire according to 19S structure and twisting in right twist mode, compression ratio of 8~10% during twisting, synchronous oiling and stress relief by deformer; Step four: filling strip setting, embedding the ultra-high molecular weight polyethylene filling strip into the pre-set groove on the periphery of the composite core, and interference fit between the groove and the filling strip; Step five: rope twisting, arranging the plurality of steel wire strands around the composite core in left twist mode, pre-pressing by roller compactor during twisting, and controlling the twist pitch multiple to be 6~7; Step six: heat setting treatment, heat setting the steel wire rope after twisting at 110~130℃ for 30~45min, and simultaneously applying a pretension of 0.5~1%; Step seven: surface treatment, coating an ultra-high molecular weight polyethylene wear-resistant coating on the outer layer of the steel wire rope, coating thickness of 0.1~0.3mm, and winding after solidification.

5. The processing method of the super high molecular core elevator hoisting steel wire rope according to claim 4, characterized in that: In step one, the heating rate of heat setting is 5℃ / min, and the temperature is naturally cooled to room temperature after holding.

6. The processing method of the super high molecular core elevator hoisting steel wire rope according to claim 4, characterized in that: In step two, the drawing pass of secondary drawing is 8~10 passes, the drawing temperature is controlled at 160~170℃, and the drawing speed is 4~5m / s.

7. The processing method of the super high molecular core elevator hoisting steel wire rope according to claim 4, characterized in that: In step three, the deformer is a double-roller structure, and the roller spacing is 1.2~1.5 times the diameter of the steel wire strand.

8. The processing method of the super high molecular core elevator hoisting steel wire rope according to claim 4, characterized in that: In step five, the compaction pressure of the roller compactor is 5~8MPa, and the compaction times is 2~3 times.

9. The processing method of the super high molecular core elevator hoisting steel wire rope according to claim 4, characterized in that: In step seven, the wear-resistant coating is coated after mixing and melting of ultra-high molecular weight polyethylene particles and EVA hot melt adhesive at a mass ratio of 9:1.

Images