High strength high bond traction belt

Abstract

The application relates to the technical field of elevator accessories, and particularly discloses a high-strength high-adhesion traction belt. The traction belt uses a steel wire rope prepared by a specific method as a framework material. The steel wire raw material in the steel wire rope undergoes steps of electroplating, drawing, zinc removal, oiling and twisting, and becomes a steel wire rope without zinc elements on the surface. The above method can play a role in corrosion prevention and oxidation resistance in the steel wire rope production process. Compared with a galvanized steel wire rope, the steel wire metal area obtained by the application reaches a maximum value, the breaking tension of the steel wire is improved, so that the breaking tension of the whole steel wire rope is significantly improved. In addition, in the preparation process of the traction belt, an adhesive does not need to be used to treat the surface of the steel wire rope, and the combination extraction force between the steel wire rope and the polyurethane material is as high as 540 N / cm.

Description

Technical Field

[0001] This application relates to the technical field of elevator components, and more specifically, it relates to a high-strength, high-adhesion traction belt. Background Technology

[0002] Traction belts are flexible elevator traction components made by wrapping a layer of polymer material (usually polyurethane) around steel wire ropes as a skeleton. Traction belts are mostly flat and strip-shaped, with a width of 30–60 mm and a thickness of 3–5 mm.

[0003] In related technologies, the steel wire rope used in traction belts is composed of several steel wires, and the surface of the steel wires generally contains a coating. That is, the steel wires are treated by electroplating to form a pure zinc layer on the surface; or the steel wires are treated by hot-dip galvanizing to form a zinc-iron alloy layer on the surface.

[0004] However, the aforementioned coated steel wire ropes still have the following drawbacks in practical applications: First, the bonding strength between the steel wire rope and the polyurethane material is poor, leading to reduced stability of the traction belt. Actual testing showed that the pull-out force between the galvanized steel wire rope and the polyurethane material was only 230 N / cm; even with an additional layer of adhesive applied to the surface of the galvanized steel wire rope, the pull-out force only increased to 380 N / cm. As the performance requirements for traction belts become increasingly stringent, the pull-out force between the steel wire rope and the polyurethane material still needs improvement. Second, actual testing showed that the breaking tensile strength of the galvanized steel wire rope was only 6.398 kN, indicating that the lifting performance of the traction belt still needs improvement. Therefore, how to further improve the breaking tensile strength of the steel wire rope remains a technical challenge in this field.

[0005] To address the aforementioned issues, there is an urgent need in this field to develop a traction belt that combines excellent operational stability with superior lifting performance. Summary of the Invention

[0006] In order to simultaneously solve the problems of poor adhesion between steel wire rope and polyurethane material, which leads to a decrease in the stability of traction belt, and poor breaking tensile strength of steel wire rope, which leads to a decrease in the lifting performance of traction belt, this application provides a high-strength, high-adhesion traction belt.

[0007] This application provides a high-strength, high-adhesion traction belt, employing the following technical solution:

[0008] A high-strength, high-adhesion traction belt comprises a steel wire rope and a polymeric material covering the steel wire rope, wherein the steel wire rope is manufactured according to the following steps:

[0009] Electroplating: The process of galvanizing raw steel wire to obtain semi-finished galvanized steel wire;

[0010] Drawing: The semi-finished galvanized steel wire is drawn to the target diameter to obtain the finished galvanized steel wire;

[0011] Zinc removal: Pickling is performed on the finished galvanized steel wire to remove the zinc coating from the surface of the steel wire, resulting in steel wire without zinc on the surface; Oiling: The zinc-removed steel wire is treated with an oil film;

[0012] Twisting: The steel wires that have been treated with oil film are twisted and combined to obtain a steel wire rope.

[0013] By adopting the above technical solution, this application uses steel wire rope manufactured using a specific preparation process as the skeleton material of the traction belt. Actual testing shows that the adhesive pull-out force between the steel wire rope and the polyurethane material in the traction belt can reach up to 540 N / cm, and the breaking tensile strength of the steel wire rope can reach up to 6.472 kN. The traction belt exhibits both excellent operational stability and lifting performance.

[0014] The specific principles involved in this application are as follows:

[0015] Compared to the galvanized steel wire ropes used in traditional traction belts, this application reduces the possibility of surface damage and corrosion of the steel wire material during the drawing process by first galvanizing the raw material for protection. This avoids localized oxidation of the raw material and reduces the possibility of partial dissolution of the surface during the subsequent zinc removal process. The final actual metal cross-sectional area of ​​the steel wire is almost identical to the theoretical metal cross-sectional area. With no coating on the steel wire surface, the actual metal cross-sectional area reaches its maximum value, increasing the breaking strength of the steel wire and thus contributing to an overall increase in the breaking strength of the wire rope.

[0016] Secondly, the polymeric materials include, but are not limited to, polyurethane, SBS rubber, etc.; polyurethane is preferred as the polymeric material because it tightly coats the steel wire rope, eliminating the need for organic adhesives. The adhesion pull-out force between the polyurethane material and the steel wire rope reaches up to 540 N / cm. Simultaneously, the polymeric material blocks the corrosion of the steel wire rope by air and moisture, making it less susceptible to corrosion. This results in the traction belt exhibiting superior performance and a longer service life.

[0017] Optionally, the zinc coating mass of the drawn steel wire is less than 2 g / m. 2 .

[0018] By adopting the above technical solution, the quality control of the zinc layer after drawing is moderate. Under the premise of ensuring that the zinc layer can densely cover the steel wire raw material, it is conducive to the subsequent zinc removal process, so that the zinc layer can be fully removed.

[0019] Optionally, the oil content of the obtained wire rope is 0.002% to 0.005%.

[0020] Optionally, the zinc layer quality in the electroplating step is controlled at 1–10 g / m².2 .

[0021] Preferably, the zinc layer quality in the electroplating step is controlled at 4-6 g / m². 2 .

[0022] By adopting the above technical solution, the zinc layer on the surface of the steel wire plays a role in surface corrosion prevention during the storage of the steel wire raw material. Simultaneously, it serves as a lubricant during the drawing process, reducing the possibility of surface damage to the steel wire raw material during drawing. Within this quality range, it ensures that the zinc layer forms a dense protective layer on the surface of the steel wire raw material while also improving the efficiency of subsequent zinc removal.

[0023] Preferably, in the electroplating step, zinc sulfate with a concentration of 20-200 g / L is used for electroplating.

[0024] By adopting the above technical solution, zinc sulfate in this concentration range can shorten the online electroplating time.

[0025] Optionally, in the drawing step, the angle of the compression zone controlled by the die is 12 to 15 degrees.

[0026] Preferably, in the drawing step, the length of the sizing strip is 0.20D, where D is the required wire diameter for each pass.

[0027] By adopting the above technical solutions, the parameters in the drawing process can be controlled to ensure the strength and toughness of the steel wire, while also enabling the zinc layer to extend evenly and fully during the drawing process, thus reducing zinc layer cracking.

[0028] In summary, this application has the following beneficial effects:

[0029] First, this application effectively reduces the possibility of surface damage and corrosion of the steel wire raw material during the drawing process by first galvanizing it for protection. This ensures almost no loss of metal cross-sectional area during the manufacturing process, thereby effectively improving the breaking strength of the wire rope. Wire ropes manufactured using this process exhibit excellent lifting performance in traction belts.

[0030] Secondly, the adhesive pull-out force between the steel wire rope and the polyurethane material is as high as 540 N / cm, which is much higher than the adhesive pull-out force between traditional galvanized steel wire rope and polyurethane material. The traction belt prepared in this application has excellent stability in use. Attached Figure Description

[0031] Figure 1 This is a scanning electron microscope (SEM) image of the steel wire sample prepared in Example 1 of this application;

[0032] Figure 2 This is a graph showing the elemental content of the steel wire sample prepared in Example 1 of this application. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-2 The present application will be further described in detail with reference to the embodiments.

[0034] Traditional traction belts typically use galvanized steel wire ropes. However, in practical applications, the applicant has found that: First, the breaking tensile strength of galvanized steel wire ropes is only 6.398 kN, leaving room for improvement. Second, the bonding effect between the zinc-coated steel wire rope and the polyurethane material is poor, with an adhesive pull-out force of only 230 N / cm. Therefore, there is still significant room for improvement in the lifting performance and operational stability of traction belts.

[0035] In related technologies, to improve the stability of traction belts, organic adhesives are generally used to treat galvanized steel wire ropes before bonding them to polyurethane materials, thereby increasing the pull-out force between the steel wire rope and the polyurethane material. However, the above solution still has the following drawbacks: First, the tackifying effect of organic adhesives is not good; they can only increase the pull-out force between the polyurethane material and the galvanized steel wire rope to 380 N / cm, which is insufficient to meet the higher adhesion performance requirements of the market. Second, organic adhesives are not environmentally friendly; the organic solvents contained in organic adhesives volatilize, causing certain environmental pollution.

[0036] To simultaneously improve the lifting performance and operational stability of traction belts, the applicant conducted extensive research on the manufacturing process of steel wire ropes. The research revealed that when the surface of a single steel wire is uncoated, its actual metal cross-sectional area equals its theoretical metal cross-sectional area. That is, the calculation of the actual metal cross-sectional area of ​​a single steel wire does not require deducting the portion occupied by the coating, allowing the actual metal cross-sectional area to reach its maximum value. Therefore, assuming consistent strength of the single steel wires, the breaking strength increases with decreasing zinc layer thickness, thus raising the breaking strength of the steel wire rope. However, during the drawing process, the lack of a protective layer on the surface of the single steel wire makes it susceptible to damage and oxidation, indirectly reducing its metal cross-sectional area. Consequently, the breaking strength not only fails to improve but may even significantly decrease.

[0037] Based on this discovery, this application describes a method that involves first galvanizing the steel wire raw material for protection before drawing it to a predetermined diameter. During the drawing process, a dense coating remains on the surface of the steel wire, and there is no corrosion or damage to the surface. The pickling process for removing zinc does not affect the metal area of ​​the steel wire. Therefore, the final steel wire exhibits no loss of metal cross-sectional area, and its breaking strength can reach 6.472 kN.

[0038] Meanwhile, the applicant twists this steel wire into a rope, and the resulting steel wire rope exhibits an adhesive pull-out force of up to 540 N / cm with the polyurethane material. This application achieves a significant improvement in adhesive pull-out force between the steel wire rope and the polyurethane material without the need for organic adhesives. Furthermore, because the steel wire rope bonds to the polyurethane material promptly, and the polyurethane material tightly encapsulates the steel wire rope, it prevents corrosion from air, moisture, and other substances. The steel wire rope is not easily corroded within the polyurethane material, resulting in a traction belt with a service life no less than that of traction belts made from traditional galvanized steel wire rope.

[0039] This application successfully produced a traction belt with excellent lifting performance and operational stability.

[0040] Preparation Example

[0041] Preparation Example 1

[0042] A type of steel wire rope is produced according to the following steps:

[0043] Wire rod: The grade of the wire rod is Shagang 82A, and the diameter of the wire rod is 5.5mm;

[0044] Pickling and boron coating: The wire rod is pickled on the concentrated surface, boron coated, and then drawn in a straight line to obtain steel wire raw material with a diameter of 2.5mm; Heat treatment and boron coating: The steel wire raw material is heat treated with a heating temperature of 950~1000℃, an isothermal transformation temperature of 550~580℃, and a winding speed of 45~55m / min.

[0045] Boron coating followed by straight-line drawing yields steel wire raw material with a diameter of 1.2 mm.

[0046] Electroplating: The steel wire raw material is first heat-treated, with a heating temperature of 950-1000℃, an isothermal transformation temperature of 550-580℃, and a take-up speed of 45-55m / min;

[0047] The steel wire raw material is then immersed in a zinc sulfate solution with a concentration of 70 g / L, and the single wire current density is controlled at 8 A / dm. 2 After cleaning, a tensile strength of 1280 MPa and a zinc coating mass of 5.5 g / m were obtained. 2 Semi-finished galvanized steel wire;

[0048] Drawing: Semi-finished galvanized steel wire is drawn using a water tank. In each drawing pass, the die controls the compression zone angle to 12 degrees, and the sizing strip length is 0.20D, where D is the required wire diameter for each pass. This yields a tensile strength of 2850 MPa and a zinc coating weight of 1.17 g / m². 2 Finished galvanized steel wire;

[0049] Zinc removal: Ultrasonic hydrochloric acid cleaning is used with an ultrasonic frequency of 25kHz and a hydrochloric acid concentration of 100g / L until the residual zinc layer on the surface of the finished galvanized steel wire is removed. After testing, the zinc content on the surface of the steel wire is 0.

[0050] Oiling: At the same time, immediately coat the surface of the steel wire with a protective oil film so that the entire coil of steel wire will not seep oil.

[0051] Twisting: The steel wires are twisted according to the specifications of 1*7-0.72mm and 1*7-0.78mm, and finally twisted into a rope according to the specification of 7*7-2.08mm to obtain a steel wire rope;

[0052] Cleaning and degreasing: The steel wire rope is cleaned and degreased using ultrasonic alkaline washing until the oil content of the smooth steel wire rope is 0.002%; Packaging: The cleaned and degreased steel wire rope is packaged with moisture-proof paper, desiccant is placed inside and vacuum is applied.

[0053] Preparation Example 2

[0054] The steel wire rope differs from Example 1 in that the process parameters for electroplating, drawing, zinc removal, and oiling are different. The specific parameters for each step are as follows:

[0055] Electroplating: The steel wire raw material is first heat-treated, with a heating temperature of 950-1000℃, an isothermal transformation temperature of 550-580℃, and a take-up speed of 45-55m / min;

[0056] The steel wire raw material was immersed in a zinc sulfate solution with a concentration of 80 g / L, and the single wire current density was controlled at 10 A / dm³. 2 After removal and cleaning, the tensile strength was 1280 MPa and the zinc layer mass was 6 g / m. 2 Semi-finished galvanized steel wire;

[0057] Drawing: Semi-finished galvanized steel wire is drawn using a water tank. In each drawing pass, the die controls the compression zone angle to be 12 degrees, and the sizing strip length is 0.20D, where D is the required wire diameter for each pass. This yields a tensile strength of 2850 MPa and a zinc coating weight of 1.25 g / m. 2 Finished galvanized steel wire;

[0058] Zinc removal: Ultrasonic hydrochloric acid cleaning is used with an ultrasonic frequency of 35kHz and a hydrochloric acid concentration of 50g / L until the residual zinc layer on the surface of the finished galvanized steel wire is removed. After testing, the zinc content on the surface of the steel wire is 0.

[0059] Oiling: At the same time, immediately coat the surface of the steel wire with a protective oil film so that the entire coil of steel wire will not seep oil.

[0060] Cleaning and degreasing: The wire rope is cleaned and degreased using ultrasonic alkaline washing until the oil content of the wire rope is measured to be 0.005%.

[0061] Packaging: The cleaned and degreased steel wire rope is packaged by wrapping it in moisture-proof paper, adding desiccant, and then vacuum-sealing it.

[0062] Preparation Example 3

[0063] The steel wire rope differs from Example 1 in that the process parameters for electroplating, drawing, zinc removal, and oiling are different. The specific parameters for each step are as follows:

[0064] Electroplating: The steel wire raw material is first heat-treated, with a heating temperature of 950-1000℃, an isothermal transformation temperature of 550-580℃, and a take-up speed of 45-55m / min;

[0065] The steel wire raw material was immersed in a zinc sulfate solution with a concentration of 120 g / L, and the single wire current density was controlled at 10 A / dm³. 2 After cleaning, a tensile strength of 1280 MPa and a zinc layer mass of 10 g / m were obtained. 2 Semi-finished galvanized steel wire;

[0066] Drawing: Semi-finished galvanized steel wire is drawn using a water tank. In each drawing pass, the die controls the compression zone angle to be 15 degrees, and the sizing strip length is 0.20D, where D is the required wire diameter for each pass. This yields a tensile strength of 2850 MPa and a zinc coating weight of 1.85 g / m. 2 Finished galvanized steel wire;

[0067] Zinc removal: Ultrasonic hydrochloric acid cleaning is used until the residual zinc layer on the surface of the finished galvanized steel wire is removed. After testing, the zinc content on the surface of the steel wire is 0.

[0068] Oiling: At the same time, immediately coat the surface of the steel wire with a protective oil film so that the entire coil of steel wire will not seep oil.

[0069] Twisting: The steel wires are twisted according to the specifications of 1*7-0.72mm and 1*7-0.78mm, and finally twisted into a rope according to the specification of 7*7-2.08mm to obtain a bright steel wire rope;

[0070] Cleaning and degreasing: The wire rope is cleaned and degreased using ultrasonic alkaline washing until the oil content of the wire rope is measured to be 0.002%.

[0071] Packaging: The cleaned and degreased steel wire rope is packaged by wrapping it in moisture-proof paper, adding desiccant, and then vacuum-sealing it.

[0072] Preparation Example 4

[0073] The steel wire rope differs from Example 1 in that the process parameters for electroplating, drawing, zinc removal, and oiling are different. The specific parameters for each step are as follows:

[0074] Electroplating: The steel wire raw material is first heat-treated, with a heating temperature of 950-1000℃, an isothermal transformation temperature of 550-580℃, and a take-up speed of 45-55m / min;

[0075] The steel wire raw material was immersed in a zinc sulfate solution with a concentration of 50 g / L, and the single wire current density was controlled at 8 A / dm. 2 After removal and cleaning, the tensile strength was 1280 MPa and the zinc layer mass was 4 g / m. 2 Semi-finished galvanized steel wire;

[0076] Drawing: The semi-finished galvanized steel wire is drawn using a water tank. The die controls the compression zone angle to be 12 degrees, and the sizing strip length is 0.20D, where D is the required wire diameter per pass. This yields a tensile strength of 2850 MPa and a zinc coating weight of 0.95 g / m. 2 Finished galvanized steel wire;

[0077] Zinc removal: Ultrasonic hydrochloric acid cleaning is used with an ultrasonic frequency of 25kHz and a hydrochloric acid concentration of 100g / L until the residual zinc layer on the surface of the finished galvanized steel wire is removed. After testing, the zinc content on the surface of the steel wire is 0.

[0078] Oiling: At the same time, immediately coat the surface of the steel wire with a protective oil film so that the entire coil of steel wire will not seep oil.

[0079] Twisting: The steel wires are twisted according to the specifications of 1*7-0.72mm and 1*7-0.78mm, and finally twisted into a rope according to the specification of 7*7-2.08mm to obtain a steel wire rope;

[0080] Cleaning and degreasing: The wire rope is cleaned and degreased using ultrasonic alkaline washing until the oil content of the wire rope is measured to be 0.002%.

[0081] Packaging: The cleaned and degreased smooth steel wire rope is packaged by wrapping it in moisture-proof paper, adding desiccant, and then vacuum-sealing it.

[0082] Preparation Example 5

[0083] One type of steel wire rope differs from Example 1 in that the process parameters for electroplating, drawing, zinc removal, and oiling are different. The specific parameters for each step are as follows:

[0084] Electroplating: The steel wire raw material is first heat-treated, with a heating temperature of 950-1000℃, an isothermal transformation temperature of 550-580℃, and a take-up speed of 45-55m / min;

[0085] The steel wire raw material was immersed in a zinc sulfate solution with a concentration of 40 g / L, and the single wire current density was controlled at 5 A / dm³. 2 After removal and cleaning, the tensile strength was 1280 MPa and the zinc layer mass was 0.5 g / m. 2Semi-finished galvanized steel wire;

[0086] Drawing: The semi-finished galvanized steel wire was drawn using a water tank. The die controlled the compression zone angle at 12 degrees, and the sizing strip length was 0.20D, where D is the required wire diameter per pass. This resulted in a tensile strength of 2850 MPa and a zinc coating weight of 0.3 g / m. 2 Finished galvanized steel wire;

[0087] Zinc removal: Ultrasonic hydrochloric acid cleaning is used with an ultrasonic frequency of 30kHz and a hydrochloric acid concentration of 90g / L until the residual zinc layer on the surface of the finished galvanized steel wire is removed. After testing, the zinc content on the surface of the steel wire is 0.

[0088] Oiling: At the same time, immediately coat the surface of the steel wire with a protective oil film so that the entire coil of steel wire will not seep oil.

[0089] Twisting: The steel wires are twisted according to the specifications of 1*7-0.72mm and 1*7-0.78mm, and finally twisted into a rope according to the specification of 7*7-2.08mm to obtain a steel wire rope;

[0090] Cleaning and degreasing: The wire rope is cleaned and degreased using ultrasonic alkaline washing until the oil content of the wire rope is measured to be 0.002%.

[0091] Packaging: The cleaned and degreased steel wire rope is packaged by wrapping it in moisture-proof paper, adding desiccant, and then vacuum-sealing it.

[0092] Preparation Example 6

[0093] One type of steel wire rope differs from Example 1 in that the process parameters for electroplating, drawing, zinc removal, and oiling are different. The specific parameters for each step are as follows:

[0094] Electroplating: The steel wire raw material is first heat-treated, with a heating temperature of 950-1000℃, an isothermal transformation temperature of 550-580℃, and a take-up speed of 45-55m / min;

[0095] The steel wire raw material was immersed in a zinc sulfate solution with a concentration of 200 g / L, and the single wire current density was controlled at 10 A / dm. 2 After removal and cleaning, the tensile strength was 1280 MPa and the zinc layer mass was 20 g / m. 2 Semi-finished galvanized steel wire;

[0096] Drawing: The semi-finished galvanized steel wire was drawn using a water tank. The die controlled the compression zone angle at 12 degrees, and the sizing strip length was 0.20D, where D is the required wire diameter per pass. This resulted in a tensile strength of 2850 MPa and a zinc coating weight of 3.35 g / m. 2 Finished galvanized steel wire;

[0097] Zinc removal: Ultrasonic hydrochloric acid cleaning is used with an ultrasonic frequency of 30kHz and a hydrochloric acid concentration of 90g / L until the residual zinc layer on the surface of the finished galvanized steel wire is removed. After testing, the zinc content on the surface of the steel wire is 0.

[0098] Oiling: At the same time, immediately coat the surface of the steel wire with a protective oil film so that the entire coil of steel wire will not seep oil.

[0099] Twisting: The steel wires are twisted according to the specifications of 1*7-0.72mm and 1*7-0.78mm, and finally twisted into a rope according to the specification of 7*7-2.08mm to obtain a steel wire rope;

[0100] Cleaning and degreasing: The wire rope is cleaned and degreased using ultrasonic alkaline washing until the oil content of the wire rope is measured to be 0.002%.

[0101] Packaging: The cleaned and degreased steel wire rope is packaged by wrapping it in moisture-proof paper, adding desiccant, and then vacuum-sealing it.

[0102] Preparation Example 7

[0103] One type of steel wire rope differs from Example 1 in that the process parameters for electroplating, drawing, zinc removal, and oiling are different. The specific parameters for each step are as follows:

[0104] Electroplating: The steel wire raw material is first heat-treated, with a heating temperature of 950-1000℃, an isothermal transformation temperature of 550-580℃, and a take-up speed of 45-55m / min;

[0105] The steel wire raw material was immersed in a zinc sulfate solution with a concentration of 20 g / L, and the single wire current density was controlled at 5 A / dm³. 2 After removal and cleaning, the tensile strength was 1280 MPa and the zinc layer mass was 0.425 g / m. 2 Semi-finished galvanized steel wire;

[0106] Drawing: The semi-finished galvanized steel wire is drawn using a water tank. The die controls the compression zone angle to be 12 degrees, and the sizing strip length is 0.20D, where D is the required wire diameter per pass. This yields a tensile strength of 2850 MPa and a zinc coating weight of 0.15 g / m. 2 Finished galvanized steel wire;

[0107] Zinc removal: Ultrasonic hydrochloric acid cleaning is used with an ultrasonic frequency of 30kHz and a hydrochloric acid concentration of 90g / L until the residual zinc layer on the surface of the finished galvanized steel wire is removed. After testing, the zinc content on the surface of the steel wire is 0.

[0108] Oiling: At the same time, immediately coat the surface of the steel wire with a protective oil film so that the entire coil of steel wire will not seep oil.

[0109] Twisting: The steel wires are twisted according to the specifications of 1*7-0.72mm and 1*7-0.78mm, and finally twisted into a rope according to the specification of 7*7-2.08mm to obtain a steel wire rope;

[0110] Cleaning and degreasing: The wire rope is cleaned and degreased using ultrasonic alkaline washing until the oil content of the wire rope is measured to be 0.002%.

[0111] Packaging: The cleaned and degreased steel wire rope is packaged by wrapping it in moisture-proof paper, adding desiccant, and then vacuum-sealing it.

[0112] Preparation of comparative examples

[0113] Preparation of Comparative Example 1

[0114] A galvanized steel wire rope is produced according to the following steps:

[0115] Wire rod: The grade of the wire rod is Shagang 82A, and the diameter of the wire rod is 5.5mm;

[0116] Pickling and boron coating: The wire rod is pickled on the concentrated surface, boron coated, and then drawn in a straight line to obtain steel wire raw material with a diameter of 2.5mm; Heat treatment and boron coating: The steel wire raw material is heat treated with a heating temperature of 950~1000℃, an isothermal transformation temperature of 550~580℃, and a winding speed of 45~55m / min.

[0117] Boron coating followed by straight-line drawing yields steel wire raw material with a diameter of 1.2 mm.

[0118] Electroplating: The steel wire raw material is first heat-treated, with a heating temperature of 950-1000℃, an isothermal transformation temperature of 550-580℃, and a take-up speed of 45-55m / min;

[0119] The steel wire raw material was immersed in a zinc sulfate solution with a concentration of 70 g / L, and the single wire current density was controlled at 8 A / dm. 2 After removal and cleaning, the tensile strength was 1280 MPa and the zinc layer mass was 5.5 g / m. 2 Semi-finished galvanized steel wire;

[0120] Drawing: The semi-finished galvanized steel wire was drawn using a water tank. The die controlled the compression zone angle at 12 degrees, and the sizing strip length was 0.20D, where D is the required wire diameter per pass. This resulted in a tensile strength of 2850 MPa and a zinc coating weight of 1.175 g / m. 2 Finished galvanized steel wire;

[0121] Twisting: The finished galvanized steel wires are twisted according to the specifications of 1*7-0.72mm and 1*7-0.78mm, and finally twisted into rope according to the specification of 7*7-2.08mm to obtain galvanized steel wire rope;

[0122] Cleaning and degreasing: The galvanized steel wire rope is degreased by ultrasonic alkaline washing until the oil content of the galvanized steel wire rope is 0.002%.

[0123] Packaging: The galvanized steel wire rope, after being cleaned and degreased, is packaged by wrapping it in moisture-proof paper, adding desiccant, and then vacuum-sealing it.

[0124] Preparation of Comparative Example 2

[0125] A smooth steel wire rope is manufactured according to the following steps:

[0126] Wire rod: The grade of the wire rod is Shagang 82A, and the diameter of the wire rod is 5.5mm;

[0127] Pickling: The wire rods are pickled on the surface, then washed and dried with water, and then heat-treated.

[0128] Heat treatment: heating temperature is selected as 950~1000℃, isothermal transition temperature is 550~580℃, and winding speed is 45~55m / min;

[0129] Phosphating: The heat-treated steel wire is pickled, washed with water, and then phosphated online to obtain phosphated semi-finished steel wire; Drawing: The phosphated semi-finished steel wire is drawn in a water tank. The die controls the compression zone angle to be 12 degrees and the sizing strip length to be 0.20D, where D is the required wire diameter for each pass, to obtain a bright steel wire with a tensile strength of 2850MPa.

[0130] Determining the weight of the phosphated film: Measure the weight of the phosphated film on the surface of the smooth steel wire; the film weight is 0.5 g / m². 2 ;

[0131] Twisting: The bright steel wires are twisted according to the specifications of 1*7-0.72mm and 1*7-0.78mm, and finally twisted into rope according to the specification of 7*7-2.08mm to obtain the bright steel wire rope;

[0132] Cleaning and degreasing: Ultrasonic alkaline cleaning is used to degrease the bright steel wire rope until the oil content of the bright steel wire rope is 0.002%.

[0133] Packaging: The cleaned and degreased smooth steel wire rope is packaged by wrapping it in moisture-proof paper, adding desiccant, and then vacuum-sealing it.

[0134] Example

[0135] Example 1

[0136] A high-strength, high-adhesion traction belt is prepared according to the following steps:

[0137] At least two layers of polyurethane material sheets (model Yuanchuang 50-90A) arranged along the thickness direction of the traction belt are drawn out and introduced into the die head of the extruder after preheating.

[0138] The die head is provided with an extrusion core corresponding to the cross section of the traction belt. The extrusion core is the steel wire rope prepared in Preparation Example 1. Molten polyurethane material sheet is uniformly wrapped around the steel wire rope in the die head and drawn out from the die head of the extruder for preliminary shaping. After cooling and shaping, the traction belt is obtained.

[0139] Examples 2-7

[0140] A high-strength, high-adhesion traction belt differs from Example 1 in that it uses a different extrusion die core. The specific source of the extrusion die core is as follows:

[0141] The extrusion die core of Example 2 is the steel wire rope prepared in Preparation Example 2;

[0142] The extrusion die core of Example 3 is the steel wire rope prepared in Example 3;

[0143] The extrusion die core of Example 4 is the steel wire rope prepared in Example 4;

[0144] The extrusion die core of Example 5 is the steel wire rope prepared in Example 5;

[0145] The extrusion die core of Example 6 is the steel wire rope prepared in Example 6;

[0146] The extrusion die core of Example 7 is the steel wire rope prepared in Example 7.

[0147] Comparative Example

[0148] Comparative Example 1

[0149] A traction belt, which differs from Example 1 in that the extrusion die core is the galvanized steel wire rope prepared in Comparative Example 1.

[0150] Comparative Example 2

[0151] The difference between this traction belt and Example 1 is that the extrusion die core is made of the galvanized steel wire rope prepared in Comparative Example 1, and the surface of the extrusion die core is coated with a layer of epoxy resin (the epoxy resin type is 3MDP760) before it is placed into the die head, and then extruded together with polyurethane material.

[0152] Comparative Example 3

[0153] A traction belt differs from Example 1 in that the extrusion die core is used to prepare the smooth steel wire rope obtained in Comparative Example 2.

[0154] Performance testing

[0155] Detection methods

[0156] 1. Zinc coating quality inspection:

[0157] According to the standard requirements, obtain steel wire samples of the corresponding length based on the steel wire diameter range;

[0158] The steel wire sample was wiped with ethanol.

[0159] The steel wire sample was placed in acetone cleaning agent and subjected to ultrasonic vibration. After 5 minutes, it was taken out, cleaned, dried, and weighed on a balance to obtain the initial weight m1.

[0160] The acetone-cleaned steel wire was placed in a prepared hydrochloric acid solution to chemically dissolve the zinc layer on its surface. Once no reaction was observed, the sample was removed, cleaned, dried, and weighed on a balance to obtain the final weight m2.

[0161] The formula for calculating the weight of the zinc coating on steel wire is: M = 1960 × d × (m1 - m2) / m2

[0162] In the formula: M -- weight of zinc layer per unit area of ​​steel wire, in grams per square meter (g / m²) 2 );

[0163] m1 -- The weight of the sample before the zinc layer is removed, in grams (g);

[0164] m2 -- The weight of the sample after removing the zinc layer, in grams (g);

[0165] d -- is the diameter of the steel wire after the zinc layer has been removed from the sample, in millimeters (mm);

[0166] 1960 is a constant.

[0167] 2. Residual Zinc Element Detection Method - Scanning Electron Microscopy (SEM-EDS): The specific steps are as follows:

[0168] Obtain steel wire samples of appropriate length according to the actual conditions of the scanning electron microscope;

[0169] After wiping with ethanol, the steel wire sample was placed in acetone cleaning agent and subjected to ultrasonic vibration. After 5 minutes, it was taken out, cleaned, and dried to obtain a clean steel wire sample.

[0170] The prepared steel wire sample was observed on the surface using SEM-EDS; based on the EDS results, it was determined whether it contained zinc.

[0171] 3. Breaking strength calculation:

[0172] Formula F0=K'×S×R0 / 1000;

[0173] Where: F0—minimum breaking strength of the wire rope, in kN;

[0174] S—The sum of the metallic cross-sectional areas of the individual steel wires in the wire rope, expressed in mm.2 ;

[0175] R0—Nominal tensile strength of the wire rope, in MPa;

[0176] K′—Minimum breaking tensile strength coefficient of a certain type of wire rope (K′ is 1 in this formula).

[0177] 4. Adhesive pull-out force: Tested according to GB / T-2000.

[0178] 5. Traction belt service life test: Refer to the provisions of standard YB / T4288-2012, and use the resistance test method to calculate the service life of the traction belt; use the relationship between the resistance change of the wire rope in the traction belt and the remaining strength for online detection. When the resistance reaches the set value, it indicates that the remaining strength has reached the lower limit value, and the traction belt is scrapped; record the number of times the traction belt reaches the scrapping level.

[0179] Test results

[0180] Table 1. Breaking tensile strength test results of the steel wire ropes used in Examples 1-7 and Comparative Examples 1-3

[0181]

[0182] Note: The tensile strength is 2850 MPa.

[0183] Table 2. Test results of adhesive pull-out force in Examples 1-7 and Comparative Examples 1-3

[0184] Test sample Adhesive pull-out force (N / cm) Test sample Adhesive pull-out force (N / cm) Example 1 540 Example 6 530 Example 2 535 Example 7 532 Example 3 533 Comparative Example 1 230 Example 4 539 Comparative Example 2 380 Example 5 536 Comparative Example 3 200

[0185] Table 3. Test results of service life of Examples 1-7 and Comparative Examples 1-3

[0186] Test sample Number of times / (ten thousand times) Test sample Number of times / (ten thousand times) Example 1 200 Example 6 200 Example 2 200 Example 7 200 Example 3 200 Comparative Example 1 150 Example 4 200 Comparative Example 2 250 Example 5 200 Comparative Example 3 120

[0187] Combining Example 1 and Comparative Example 1, and referring to Tables 1-3, it can be seen that: Comparative Example 1 uses traditional galvanized steel wire rope as the traction belt skeleton material. The breaking strength of the traditional galvanized steel wire rope is affected by the coating and is significantly lower than that of the bright steel wire rope in Example 1. Furthermore, the adhesion between the traditional galvanized steel wire rope and the polyurethane material is not as good as that of the bright steel wire rope when applied to the traction belt. In addition, there is a significant difference in the service life of traction belts made of traditional galvanized steel wire rope and bright steel wire rope. The reason may be that the adhesion between the steel wire rope and the polyurethane material is poor, and the coating peels off during the bending process, which accelerates the corrosion of the steel wire rope by external moisture and air, resulting in a shorter service life for traction belts made of traditional galvanized steel wire rope than those made of bright steel wire rope.

[0188] Based on Example 1 and Comparative Example 2, and in conjunction with Tables 1-3, it can be seen that although pretreatment of galvanized steel wire rope with organic adhesive can improve the bonding pull-out force, the improvement effect is limited, and the effect of bonding directly with bright steel wire rope is better.

[0189] Combining Example 1 and Comparative Example 3, and referring to Tables 1-3, it can be seen that the steel wire rope used in Comparative Example 3 is a bright steel wire rope made by a traditional phosphating process. This process involves heat treatment and phosphating of the steel wire raw material, followed by drawing of the phosphated steel wire semi-finished product. The resulting bright steel wire rope will have some phosphate film remaining on its surface. The residual phosphorus on the surface of the steel wire rope can easily lead to a decrease in adhesive performance, resulting in incomplete polyurethane material coating and easy penetration of moisture and air.

[0190] In conjunction with Examples 1-7 and Tables 1-3, and Figure 1-2 It can be seen that the thickness of the zinc layer and the drawing process parameters need to be controlled within a suitable range during the electroplating process. This ensures that the coating is evenly distributed and extended during the drawing process, fully protecting the steel wire raw material, while also ensuring that the zinc is removed quickly and completely during the dezincification process. The effect of pickling on the actual metal cross-sectional area of ​​the steel wire is negligible.

[0191] Figure 1 The image shown is a scanning electron microscope (SEM) image of the steel wire surface of the steel wire rope used in this application. Figure 1 As can be seen from this, the surface of the steel wire rope used in this application is smooth and flat; Figure 2 The image shows the content of various elements on the surface of the steel wire rope used in this application. It can be seen that there is no zinc on the surface of the steel wire rope, which proves that the surface of the steel wire rope used in this application does not contain a pure zinc coating or an alloy coating containing zinc.

[0192] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high strength high cohesion traction belt comprising a steel cord and a polymeric material covering the steel cord, characterized in that: The steel wire rope is made according to the following steps: Galvanizing: the steel wire raw material is subjected to galvanizing treatment using zinc sulfate with a concentration of 20-200 g / L to obtain a semi-finished product galvanized steel wire; Drawing: the semi-finished galvanized steel wire is drawn to a target diameter to obtain a finished galvanized steel wire, the zinc layer mass of the drawn steel wire being less than 2 g / m 2 ; Zinc removal: the finished product galvanized steel wire is subjected to pickling to remove the galvanizing layer on the surface of the steel wire to obtain a steel wire without zinc element on the surface; Oil film treatment: the steel wire after zinc removal is subjected to oil film treatment; Twisting: the steel wire after oil film treatment is subjected to stranding and roping to obtain a steel wire rope.

2. A high strength high adhesion traction belt according to claim 1, characterized in that: The oil content in the steel wire rope is 0.002%-0.005%.

3. A high strength high cohesion traction belt according to claim 1, characterized in that: The mass control of the zinc layer in the electroplating step is 1-10 g / m 2 .

4. A high strength high cohesion traction belt according to claim 3, characterized in that: The mass control of the zinc layer in the electroplating step is 4-6 g / m 2 .

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