Super-large-diameter steel strand production equipment and production process

Abstract

The invention relates to super-large-diameter steel strand production equipment, and belongs to the field of steel strands, the super-large-diameter steel strand production equipment comprises a passivation pool, a heating plate is arranged at the bottom of the passivation pool, two upper guide wheels arranged at intervals are arranged in the passivation pool, and a plurality of lower guide wheels arranged at intervals are arranged between the two upper guide wheels; the multiple lower guide wheels are located on the lower sides of the two upper guide wheels, heating assemblies are arranged in the directions, away from each other, of the two upper guide wheels, and the heating assemblies are used for heating steel strands penetrating through the upper guide wheels and the lower guide wheels. The two lower guide wheels are connected with a lifting assembly used for driving the two lower guide wheels and the heating plate to move upwards when the metal surface treating agent in the passivation pool is reduced, and the passivation effect of the steel strand can be improved. The invention further discloses a production process of the super-large-diameter steel strand. The production process has the advantage that the strength of the produced steel strand is improved.

Description

Technical Field

[0001] The present application relates to a field, in particular, to a production device and a production process for ultra-large diameter steel strands. Background Art

[0002] Steel strand is a steel product made by twisting multiple steel wires together. It is mostly used in mines, bridges and other fields that require high-strength pulling.

[0003] During the current production process of steel strands, it is often necessary to passivate the steel strands, specifically by immersing the steel strands in a metal surface treatment agent so that the metal surface treatment agent adheres to the surface of the steel strands, thereby forming a protective film on the surface of the steel strands, thereby increasing the corrosion resistance of the steel strands.

[0004] The passivation operation currently used is to directly place the steel strands into the metal surface treatment agent. However, with the above operation, after the steel strands enter the passivation tank multiple times, it is difficult to accurately control the temperature inside the passivation tank, resulting in the metal surface treatment agent contacting and cooling the steel strands, thereby causing the passivation effect of the steel strands to deteriorate. Summary of the invention

[0005] In order to improve the passivation effect of steel strands, the present application provides an ultra-large diameter steel strand production device and a production process.

[0006] In the first aspect, the present application provides an ultra-large diameter steel strand production device, which adopts the following technical solution: A super-large diameter steel strand production equipment includes: a passivation tank, a heating plate is provided at the bottom of the passivation tank, two upper guide wheels are provided inside the passivation tank, and a plurality of lower guide wheels are provided at intervals in the middle position of the two upper guide wheels, and the plurality of lower guide wheels are arranged at the lower side of the two upper guide wheels, and the two upper guide wheels are provided with heating components in the direction away from each other, and the heating components are used to heat the steel strand passing through the upper guide wheels and the lower guide wheels, and the two lower guide wheels are connected with a lifting component for driving the two lower guide wheels and the heating plate to move upward when the metal surface treatment agent inside the passivation tank is reduced.

[0007] By adopting the above technical scheme, in actual use, the steel strands before entering the metal surface treatment agent are heated by the heating component, and the metal surface treatment agent inside the passivation tank is heated by the heating plate, so that the metal surface treatment agent inside the passivation tank can be kept above 80°C in contact with the steel strands, thereby reducing the phenomenon that the metal surface treatment agent is difficult to adhere to the steel strands due to the low temperature of the steel strands, and the steel strands removed from the metal surface treatment agent are heated by the heating component, so that the metal surface treatment agent can be more evenly distributed on the surface of the steel strands.

[0008] Optionally, the heating assembly includes a heating tube, a heating liquid is provided inside the heating tube, a fan is provided on the upper side of the heating tube, and the fan is used to blow air toward the steel strand on the lower side of the heating tube.

[0009] By adopting the above technical solution, when the steel strand needs to be heated, the fan is turned on, and the fan drives the wind to pass through the heating tube and blow toward the steel strand, thereby achieving the heating operation of the steel strand.

[0010] Optionally, each of the heating tubes is bent, and both ends of each of the heating tubes are connected to the same heat exchange box, and each of the heat exchange boxes is provided with two cavities respectively connected to the two ends of the heating tubes, each cavity of the heat exchange box is provided with a push plate slidingly abutting against the inner wall of the cavity, and each of the push plates is penetrated by and threadedly connected with a reciprocating screw, and the end of each reciprocating screw penetrates the side wall of the heat exchange box and is rotatably connected to the side wall of the heat exchange box, the middle of each upper guide wheel is penetrated by and fixedly connected with an upper connecting shaft, and each of the upper connecting shafts is connected to the adjacent reciprocating screws through belts and pulleys, and a heating plate is installed at the bottom of each heat exchange box.

[0011] By adopting the above technical solution, when the steel strand passes through the upper guide wheel, the upper guide wheel rotates and drives the upper connecting shaft to rotate. During the rotation, the upper connecting shaft drives the connected reciprocating screw to rotate. The two reciprocating screws inside the same heat exchange box drive the two connected push plates to move alternately, so that the heating liquid inside the heat exchange tube can be alternately driven into the heat exchange box and moved from the inside of the heat exchange box to the inside of the heating tube. Since a heating plate is provided at the bottom of the heat exchange box, the heating liquid entering the heat exchange box can be heated, thereby reducing the phenomenon that the heating liquid inside the heating tube cools down during long-term use, making it difficult to heat the steel strand.

[0012] Optionally, one side of each upper guide wheel is fixedly connected to a driving bevel gear, each driving bevel gear is meshed with a driven bevel gear, and each driven bevel gear is connected to an adjacent fan through a belt and a pulley and drives the fan to rotate.

[0013] By adopting the above technical solution, during the rotation of the upper guide wheel, the upper guide wheel drives the connected upper connecting shaft to rotate, and during the rotation of the upper connecting shaft, the driving bevel gear drives the connected driven bevel gear to rotate, and during the rotation of the driving bevel gear, the fan is driven by the driven bevel gear, thereby reducing the waste of adding a driving device to drive the fan to rotate.

[0014] Optionally, the heating plate is slidably abutted against the inner wall of the passivation tank, and the bottom of the heating plate is fixedly connected with a plurality of driving screws, and the plurality of driving screws are arranged in a one-to-one correspondence with the plurality of lower guide wheels. The lower end of each driving screw passes through the bottom wall of the passivation tank and is threadedly sleeved with a driving pulley, and the opposite sides of each driving pulley are connected to a lifting pulley through a lifting belt, one side of each lifting pulley is fixedly connected with a lifting screw, each lifting screw is threadedly sleeved with a connecting block, and the middle of each lower guide wheel is penetrated and rotatably connected with a lower connecting shaft, the end of each lower connecting shaft is rotatably and slidably inserted into the adjacent connecting block, and one side of each lower connecting shaft is abutted with a stop block, and the abutting side wall of each stop block and the lower connecting shaft is gradually inclined from bottom to top in a direction away from another adjacent lower connecting shaft.

[0015] By adopting the above technical scheme, when the metal surface treatment agent inside the passivation tank is reduced, the heating plate moves upward under the drive of the pressure spring, and the heating plate drives the connected driving screw to move in the process of moving upward, and the driving screw drives the connected active pulley to rotate in the process of moving, and the active pulley drives the connected lifting pulley to rotate in the process of rotation, and the lifting pulley drives the connected lifting screw to rotate in the rotating car, and the lifting screw drives the connected connecting block to move in the process of rotation, so that the connecting block can drive the lower connecting shaft to move upward, and due to the existence of the abutment block, multiple lower connecting shafts can move in a direction away from each other, thereby increasing the length of the steel strands on the lower side of the multiple lower guide wheels, thereby reducing the phenomenon that when the metal surface treatment agent is reduced, the contact time between the steel strand and the metal surface treatment agent is shortened, making it difficult for the metal surface treatment agent to adhere to the surface of the steel strand.

[0016] In a second aspect, the present application provides a production process for an ultra-large diameter steel strand, which adopts the following technical solution: A production process for an ultra-large diameter steel strand, the steel strand adopts a 1×19 wire warring structure, 19 wires are twisted at one time, a twist length of 12.5 times is adopted, the diameter of the center wire is 7.71mm, the diameter of the outer thick wire is 8.04mm, the diameter of the outer thin wire is 6.04mm, the diameter of the inner wire is 7.4mm, the nominal diameter of the steel strand is 34.6mm, the upper deviation of the nominal diameter is +0.40mm, and the lower deviation of the nominal diameter is -0.15mm; The manufacturing process is: wire rod selection → inspection and testing → pickling and passivation → inspection → drawing → semi-finished product inspection and testing → stranding → stabilization treatment → layer winding → finished product inspection and testing → packaging → storage. In the wire rod selection process, the four wire diameters use wire rods of the same brand and specification, and their chemical composition is: C: 0.84-0.860%, Si: 0.75-0.79%, Mn: 0.72-0.74%, P: 0.008-0.012; S: 0.0045-0.005; Cr: 0.04-0.05%, Ni: 0.001-0.002%, Cu: 0.001-0.002%, and Fe and unavoidable impurity elements; In the drawing process, the center wire is drawn from 15.0mm wire rod to 7.71mm through 9 passes, the outer layer thick wire is drawn from 15.0mm wire rod to 8.04mm through 8 passes, the inner layer wire is drawn from 15.0mm wire rod to 7.4mm through 9 passes, and the outer layer thin wire is drawn from 15.0mm wire rod to 6.04mm through 11 passes: the tensile strength of the raw materials used for the four types of wires is ≥1310MPa; the tensile strength of the center wire, inner layer wire, outer layer thin wire and outer layer thick wire after drawing reaches 2000MPa level.

[0017] By adopting the above technical solution, the production of 34.6 diameter steel strands can be achieved, which can effectively improve the strength of the steel strands, thereby making the steel strands suitable for more application scenarios.

[0018] Optionally, the nominal tensile strength of the steel strand is at the level of 1770-1960MPa, the corresponding maximum force is not less than 1395-1545kN, the 0.2% yield strength is not less than 1228; the total elongation at maximum force is ≥3.5%; and the straightness is ≤14mm.

[0019] By adopting the above technical solution, the steel strand can cope with greater pulling intensity scenarios.

[0020] Optionally, in the pickling and passivation process, the oxide scale is removed by pickling; after pickling, it is rinsed with clean water, and the passivation process temperature is not less than 80°C, a layer of carrier is formed on the surface, and the passivation film plays a role in lubrication and rust prevention.

[0021] By adopting the above technical solution, the steel strand can be fully passivated.

[0022] Optionally, a 12.5 times twist pitch is used for twisting, with a V-groove design, a groove width of 38mm, and a groove depth of 42mm; the inner hole of the wire pressing die used in the twisting process is 36mm.

[0023] By adopting the above technical solution, the finished steel strand can be made more stable during use.

[0024] Optionally, in the stabilization treatment process, the tempering temperature is 405-415°C, the running speed of the production line is lower than 9m / min, and the tension of the steel strand is controlled at 30%-35% of the threshold force of the steel strand; the cooling after tempering adopts a direct cooling immersion cooling method.

[0025] By adopting the above technical solution, the steel strand can withstand greater strength of force during subsequent use.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By expanding the nominal diameter of the steel strand to 34.6MM, the steel strand can be used in scenarios with greater tensile strength; 2. By arranging heating components on the opposite sides of the two upper guide wheels, the phenomenon that the steel strands are difficult to adhere to the metal surface treatment agent due to the low temperature of the steel strands is reduced; 3. By setting up the lifting component, the phenomenon that the steel strand is difficult to fully adhere to the metal surface treatment agent after the metal surface treatment agent inside the passivation tank is reduced is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application. Figure 2 It is a cross-sectional view of the overall structure of an embodiment of the present application. Figure 3 It is a schematic diagram showing the connection relationship between the passivation tank and the heat exchange box in an embodiment of the present application. Figure 4 It is a cross-sectional view of an embodiment of the present application that highlights the connection relationship between the heat exchange box and the heating pipe. Figure 5 It is a schematic diagram of the steel strand structure of an embodiment of the present application.

[0028] Description of reference numerals: 1, passivation tank; 11, upper guide wheel; 12, lower guide wheel; 13, upper connecting shaft; 14, lower connecting shaft; 141, liquid baffle; 2, heating plate; 3, heating assembly; 31, heating pipe; 32, fan; 33, heat exchange box; 331, partition; 332, push plate; 333, reciprocating screw; 334, push pulley; 335, drive pulley; 336, push belt; 34, heating plate; 35 , driving bevel gear; 36, driven bevel gear; 37, transmission shaft; 38, driving pulley; 381, connecting belt; 39, heating pulley; 4, lifting assembly; 41, pressure spring; 42, driving screw; 43, active pulley; 44, lifting pulley; 441, lifting belt; 45, lifting screw; 46, connecting block; 47, stop block; 5, center wire; 6, outer thick wire; 7, inner wire; 8, outer thin wire. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 -Attached Figure 5This application is described in further detail.

[0030] The present application embodiment discloses a super large diameter steel strand production equipment. Figure 1 and Figure 2 , including a passivation tank 1, wherein a metal surface treatment agent is arranged inside the passivation tank 1. A horizontally arranged heating plate 2 is arranged at the bottom of the passivation tank 1, and the heating plate 2 and the inner wall of the passivation tank 1 move up and down in the vertical direction. Two upper guide wheels 11 arranged opposite to each other are arranged inside the passivation tank 1, and the two upper guide wheels 11 are arranged at intervals in the same horizontal plane. A plurality of lower guide wheels 12 are arranged at the lower side of the middle position of the two upper guide wheels 11. In the present embodiment, the number of the lower guide wheels 12 is two, and the two lower guide wheels 12 are arranged at intervals in the same horizontal plane.

[0031] The two upper guide wheels 11 are provided with heating components 3 on opposite sides thereof, and the heating components 3 are used to heat the passing steel strands. The two lower guide wheels 12 are connected with lifting components 4, and the lifting components 4 are used to drive the two lower guide wheels 12 and the heating plate 2 to move upward when the metal surface treatment agent inside the passivation tank 1 is reduced.

[0032] In actual use, the steel strands are sequentially passed through one of the upper guide wheels 11, two lower guide wheels 12 and another upper guide wheel 11, so that the steel strands can be attached to the metal surface treatment agent under the drive of the two lower guide wheels 12, and the passivation operation of the steel strands is realized. In addition, due to the presence of the heating assembly 3 and the heating plate 2, the metal surface treatment agent and the steel strands can be at a temperature of 80°C or above, so that the metal surface treatment agent can be more evenly attached to the surface of the steel strands to treat the steel strands.

[0033] Furthermore, due to the presence of the lifting assembly 4, when the metal surface treatment agent inside the passivation tank 1 is reduced, the heating plate 2 and the two lower guide wheels 12 can be driven to move upward, so that the steel strand can still be fully coated with the metal surface treatment agent when the metal surface treatment agent inside the passivation tank 1 is reduced.

[0034] Reference Figure 2 The heating assembly 3 includes a heating tube 31 horizontally arranged on the upper side of the steel strand. In the present embodiment, each heating tube 31 is a U-shaped heating tube 31, and a fan 32 is provided on the upper side of the heating tube 31 for blowing air downward.

[0035] Reference Figure 3 and Figure 4Both ends of each heating tube 31 are connected to a horizontally arranged heat exchange box 33, and a heat supply plate 34 is fixedly connected to the bottom of the heat exchange box 33. A partition 331 is fixedly connected to the inside of the heat exchange box 33, and the partition 331 divides the inside of the heat exchange box 33 into two independent cavities. The two cavities of the heat exchange box 33 are arranged one-to-one with the two ends of the heating tube 31, and the end of each heating tube 31 is connected to the inside of the corresponding cavity.

[0036] Each cavity of the heat exchange box 33 is provided with a vertically arranged push plate 332, and each push plate 332 is penetrated and threadedly connected with a reciprocating screw 333, and each reciprocating screw 333 is vertically arranged with respect to the connected push plate 332. One end of each reciprocating screw 333 away from the connected heating pipe 31 penetrates the side wall of the heat exchange box 33 and is rotatably connected with the side wall of the heat exchange box 33, and one end of each reciprocating screw 333 penetrating the heat exchange box 33 is fixedly sleeved with a driving pulley 334.

[0037] Each upper guide wheel 11 is penetrated and fixedly connected with an upper connecting shaft 13, and the end of each upper connecting shaft 13 penetrates the adjacent side wall of the passivation tank 1 and is rotatably connected with the side wall of the passivation tank 1. One end of the upper connecting shaft 13 close to the heat exchange box 33 is fixedly connected with a driving pulley 335, and the driving pulley 335 and the adjacent two driving pulleys 334 are connected to each other through a pushing belt 336.

[0038] During use, the upper guide wheel 11 drives the upper connecting shaft 13 to rotate during the rotation process, and the upper connecting shaft 13 drives the driving pulley 335 to rotate during the rotation process, and the driving pulley 335 drives the multiple connected driving pulleys 334 to rotate during the rotation process, and each driving pulley 334 drives the connected reciprocating screw 333 to rotate during the rotation process. The two reciprocating screws 333 drive the two push plates 332 to move back and forth alternately, thereby driving the alternating exchange operation of the heating liquid inside the heating tube 31 and the heating liquid inside the heat exchange box 33. Since a heating plate 34 is provided at the bottom of the heat exchange box 33, the heating tube 31 can maintain an appropriate temperature for heating the steel strands.

[0039] Reference Figure 1 and Figure 2 The heating assembly 3 further comprises a driving bevel gear 35 fixedly connected to the end of the upper connecting shaft 13 away from the end connected to the driving pulley 335, and a driven bevel gear 36 is meshed on one side of the driving bevel gear 35, and a transmission shaft 37 is fixedly connected to the upper side of the driven bevel gear 36. A driving pulley 38 is fixedly connected to the upper end of the transmission shaft 37, and a heating pulley 39 fixedly connected to the fan 32 is provided on one side of the driving pulley 38, and the driving pulley 38 and the heating pulley 39 are sleeved with the same connecting belt 381.

[0040] During the rotation of the upper guide wheel 11, the upper guide wheel 11 drives the driving bevel gear 35 to rotate through the upper connecting shaft 13. The driving bevel gear 35 drives the connected driven bevel gear 36 to rotate during the rotation. After the rotation, the driven bevel gear 36 drives the connected transmission shaft 37 to rotate. During the rotation, the transmission shaft 37 drives the connected driving pulley 38 to rotate. The driving pulley 38 drives the heating pulley 39 and the fan 32 to rotate, thereby realizing the process of heating the steel strand by blowing air through the fan 32 and the wind passing through the heating tube 31.

[0041] The lifting assembly 4 includes a plurality of pressure springs 41 fixedly connected between the heating plate 2 and the inner bottom wall of the passivation tank 1 .

[0042] The lifting assembly 4 also includes a plurality of driving screws 42 fixedly connected to the lower side of the heating plate 2. In this embodiment, two driving screws 42 are provided, and the two driving screws 42 are provided in a one-to-one correspondence with the two lower guide wheels 12. Each driving screw 42 is vertically arranged, and the lower end of each driving screw 42 penetrates the bottom wall of the passivation tank 1 and is slidably connected to the bottom wall of the passivation tank 1. One end of each driving screw 42 penetrating the bottom wall of the passivation tank 1 is threadedly sleeved with a driving pulley 43, and the opposite sides of each driving pulley 43 are connected to a lifting pulley 44 through a lifting belt 441.

[0043] A vertically arranged lifting screw rod 45 is fixedly connected to the upper side of each lifting pulley 44 , and a connecting block 46 is threadedly sleeved on the outer side of each lifting screw rod 45 .

[0044] Each lower guide wheel 12 is penetrated and rotatably connected with a lower connecting shaft 14, and the end of each lower connecting shaft 14 penetrates the adjacent side wall of the passivation tank 1 and is rotatably and slidably connected with the side wall of the passivation tank 1. The end of each lower connecting shaft 14 is slidably inserted into the corresponding connecting block 46 and is slidably connected with the connecting block 46 in the horizontal direction. One end of each lower connecting shaft 14 that penetrates the passivation tank 1 is fixedly sleeved with a liquid baffle plate 141, and the side of each liquid baffle plate 141 close to the passivation tank 1 is slidably connected with the outer wall of the passivation tank 1 and is used to block the through hole opened on the side wall of the passivation tank 1 for the movement of the lower connecting shaft 14.

[0045] A stop block 47 is also provided between the ends of the two lower connecting shafts 14 close to the connecting block 46. In the present embodiment, the vertical cross-section of the stop block 47 is an isosceles triangle, and the included angle of the two equilateral sides of the isosceles triangle is located vertically downward between the two lower connecting shafts 14. Each lower connecting shaft 14 is abutted against the adjacent side wall of the stop block 47, and the side wall of the stop block 47 abutted by each lower connecting shaft 14 is inclined from top to bottom toward the direction close to the other lower connecting shaft 14.

[0046] In the actual production process, as the metal surface treatment agent inside the passivation tank 1 gradually decreases, the heating plate 2 gradually moves upward driven by multiple pressure springs 41, and the heating plate 2 drives the two connected driving screws 42 to move upward during the upward movement.

[0047] The driving screw 42 drives the connected driving pulley 38 to rotate during the upward movement, and the driving pulley 38 drives the connected lifting pulley 44 to rotate during the rotation, and the lifting pulley 44 drives the connected lifting screw 45 to rotate during the rotation, and the lifting screw 45 drives the connected connecting block 46 to move upward during the rotation, and the connecting block 46 drives the connected lower connecting shaft 14 to move upward during the upward movement, and due to the existence of the stop block 47, the lower connecting shaft 14 drives the two lower connecting shafts 14 to move away from each other during the upward movement, so that when the metal surface treatment agent inside the passivation tank 1 is reduced, the steel strand can maintain its original immersion length immersed in the metal surface treatment agent.

[0048] The implementation principle of the ultra-large diameter steel strand production equipment in the embodiment of the present application is: when the steel strand needs to be passivated, the steel strand will be overlapped in sequence on one of the upper guide wheels 11, the two lower guide wheels 12 and one side of the other upper guide wheel 11, so that the steel strand can be fully immersed in the metal surface treatment agent for passivation treatment.

[0049] Before the steel strand enters the metal surface treatment agent or after it is removed from the metal surface treatment agent, the steel strand is heated by the fan 32 and the heating pipe 31, so that the steel strand can be fully treated by the metal surface treatment agent.

[0050] And due to the existence of the lifting component 4, after the metal surface treatment agent inside the passivation tank 1 is reduced, the lifting component 4 can drive the heating plate 2 and the lower guide wheel 12 to move upward, so that the steel strand can still be fully immersed in the metal surface treatment agent.

[0051] The embodiment of the present application also discloses a production process of an ultra-large diameter steel strand, including: the steel strand adopts a 1×19 wire warring structure, 19 wires are twisted at one time, a twist length of 12.5 times is adopted, the diameter of the center wire 5 is 7.71 mm, the diameter of the outer thick wire 6 is 8.04 mm, the diameter of the outer thin wire 8 is 6.04 mm, the diameter of the inner wire 7 is 7.4 mm, the nominal diameter of the steel strand is 34.6 mm, the upper deviation of the nominal diameter is +0.40 mm, and the lower deviation of the nominal diameter is -0.15 mm; The manufacturing process is: wire rod selection → inspection and testing → pickling and passivation → inspection → drawing → semi-finished product inspection and testing → stranding → stabilization treatment → layer winding → finished product inspection and testing → packaging → storage. In the wire rod selection process, the four wire diameters use wire rods of the same brand and specification, and their chemical composition is: C: 0.84-0.860%, Si: 0.75-0.79%, Mn: 0.72-0.74%, P: 0.008-0.012%; S: 0.0045-0.005%; Cr: 0.04-0.05%, Ni: 0.001-0.002%, Cu: 0.001-0.002%, and Fe and unavoidable impurity elements; In the drawing process, the center wire 5 is drawn from 15.0mm wire rod to 7.71mm through 9 passes, the outer layer thick wire 6 is drawn from 15.0mm wire rod to 8.04mm through 8 passes, the inner layer wire 7 is drawn from 15.0mm wire rod to 7.4mm through 9 passes, and the outer layer thin wire 8 is drawn from 15.0mm wire rod to 6.04mm through 11 passes: the tensile strength of the raw materials used for the four types of wires is ≥1310MPa; the tensile strength of the center wire 5, inner layer wire 7, outer layer thin wire 8, and outer layer thick wire 6 after drawing reaches 2000MPa level.

[0052] The nominal tensile strength of the steel strand is at the level of 1770-1960MPa, the corresponding maximum force is not less than 1395-1545kN, the 0.2% yield strength is not less than 1228; the total elongation at maximum force is ≥3.5%; the straightness is ≤14mm.

[0053] The wire drawing machine uses 11 turntables to increase the feed diameter and enhance the toughness of the wire. Ensure the stability of the wire strength. Improve the performance and strength of the finished steel strand. In the twisting process, the JXN1×19 low relaxation prestressed steel strand equipment is used. This equipment uses a 19-axis skipping process. Make the steel strands tight and not loose. Twisting is carried out using a 12.5 times twist pitch, a V-groove design, a groove width of 38mm, and a groove depth of 42mm; the inner hole of the wire pressing die used in the twisting process is 36mm.

[0054] In the pickling and passivation process, the scale is removed by pickling; after pickling, it is rinsed with clean water. The passivation process temperature is not less than 80℃, and a layer of carrier is formed on the surface. The passivation film plays a role in lubrication and rust prevention. In the stabilization process, the tempering temperature is 405-415℃, the running speed of the production line is less than 9m / min, and the tension of the steel strand is controlled at 30%-35% of the maximum force of the steel strand; the cooling after tempering adopts direct cooling immersion cooling method.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A super large diameter steel strand production equipment, characterized in that: include: A passivation tank (1), wherein a heating plate (2) is provided at the bottom of the passivation tank (1), two upper guide wheels (11) are arranged at intervals inside the passivation tank (1), and a plurality of lower guide wheels (12) are arranged at intervals between the two upper guide wheels (11), and the plurality of lower guide wheels (12) are arranged at the lower sides of the two upper guide wheels (11), and a heating assembly (3) is provided in a direction away from each other of the two upper guide wheels (11), and the heating assembly (3) is used to heat a steel strand passing through the upper guide wheel (11) and the lower guide wheel (12), and the two lower guide wheels (12) are connected to a lifting assembly (4) used to drive the two lower guide wheels (12) and the heating plate (2) to move upward when a metal surface treatment agent inside the passivation tank (1) is reduced.

2. The super-large diameter steel strand production equipment according to claim 1, characterized in that: The heating assembly (3) comprises a heating tube (31), a heating liquid is arranged inside the heating tube (31), a fan (32) is arranged on the upper side of the heating tube (31), and the fan (32) is used to blow air toward the steel strand at the lower side of the heating tube (31).

3. The super-large diameter steel strand production equipment according to claim 2, characterized in that: Each of the heating tubes (31) is arranged to be bent, and both ends of each of the heating tubes (31) are connected to the same heat exchange box (33), and each of the heat exchange boxes (33) is provided with two cavities respectively connected to the two ends of the heating tube (31), and each cavity of the heat exchange box (33) is provided with a push plate (332) that slides against the inner wall of the cavity, and each of the push plates (332) is penetrated by and threadedly connected with a reciprocating screw (333), and the end of each of the reciprocating screws (333) penetrates the side wall of the heat exchange box (33) and is rotatably connected to the side wall of the heat exchange box (33), and the middle of each of the upper guide wheels (11) is penetrated by and fixedly connected with an upper connecting shaft (13), and each of the upper connecting shafts (13) is connected to the adjacent reciprocating screws (333) through a belt and a pulley, and a heating plate (34) is installed at the bottom of each of the heat exchange boxes (33).

4. The super-large diameter steel strand production equipment according to claim 2, characterized in that: One side of each upper guide wheel (11) is fixedly connected to a driving bevel gear (35), each driving bevel gear (35) is meshed with a driven bevel gear (36), and each driven bevel gear (36) is connected to an adjacent fan (32) through a belt and a pulley and drives the fan (32) to rotate.

5. The super-large diameter steel strand production equipment according to claim 1, characterized in that: The heating plate (2) is in sliding contact with the inner wall of the passivation tank (1); a plurality of driving screws (42) are fixedly connected to the bottom of the heating plate (2); the plurality of driving screws (42) are arranged in one-to-one correspondence with the plurality of lower guide wheels (12); the lower end of each driving screw (42) passes through the bottom wall of the passivation tank (1) and is threadedly sleeved with a driving pulley (43); the opposite sides of each driving pulley (43) are connected to a lifting pulley (44) via a lifting belt (441); and one side of each lifting pulley (44) is A lifting screw rod (45) is fixedly connected, each of the lifting screw rods (45) is threadedly sleeved with a connecting block (46), and the middle of each lower guide wheel (12) is penetrated by and rotatably connected with a lower connecting shaft (14), the end of each lower connecting shaft (14) is rotatably and slidably inserted into the adjacent connecting block (46), and a stop block (47) is abutted on one side of each lower connecting shaft (14), and the abutting side wall of each stop block (47) and the lower connecting shaft (14) is gradually inclined from bottom to top in a direction away from another adjacent lower connecting shaft (14).

6. A process for producing an ultra-large diameter steel strand, characterized in that: The invention relates to an ultra-large diameter steel strand production equipment as claimed in any one of claims 1 to 5, comprising: the steel strand adopts a 1×19 wire warp strand structure, 19 wires are twisted at one time, a twist length of 12.5 times is adopted, the diameter of the central wire (5) is 7.71 mm, the diameter of the outer thick wire (6) is 8.04 mm, the diameter of the outer thin wire (8) is 6.04 mm, the diameter of the inner wire (7) is 7.4 mm, the nominal diameter of the steel strand is 34.6 mm, the upper deviation of the nominal diameter is +0.40 mm, and the lower deviation of the nominal diameter is -0.15 mm; The manufacturing process is: wire rod selection → inspection and testing → pickling and passivation → inspection → drawing → semi-finished product inspection and testing → stranding → stabilization treatment → layer winding → finished product inspection and testing → packaging → storage. In the wire rod selection process, the four wire diameters use wire rods of the same brand and specification, and their chemical composition is: C: 0.84-0.860%, Si: 0.75-0.79%, Mn: 0.72-0.74%, P: 0.008-0.012%; S: 0.0045-0.005%; Cr: 0.04-0.05%, Ni: 0.001-0.002%, Cu: 0.001-0.002%, and Fe and unavoidable impurity elements; In the drawing process, the center wire (5) is drawn from a 15.0 mm wire rod to 7.71 mm through 9 passes, the outer layer thick wire (6) is drawn from a 15.0 mm wire rod to 8.04 mm through 8 passes, the inner layer wire (7) is drawn from a 15.0 mm wire rod to 7.4 mm through 9 passes, and the outer layer thin wire (8) is drawn from a 15.0 mm wire rod to 6.04 mm through 11 passes: the tensile strength of the raw materials used for the four types of wires is ≥1310 MPa; the tensile strength of the center wire (5), the inner layer wire (7), the outer layer thin wire (8), and the outer layer thick wire (6) after drawing reaches the 2000 MPa level.

7. A process for producing super-large diameter steel strand according to claim 6, characterized in that: The nominal tensile strength of the steel strand is at the level of 1770-1960MPa, the corresponding maximum force is not less than 1395-1545kN, the 0.2% yield strength is not less than 1228; the total elongation at maximum force is ≥3.5%; the straightness is ≤14mm.

8. A process for producing super-large diameter steel strands according to claim 6, characterized in that: In the pickling and passivation process, the oxide scale is removed by pickling; after pickling, it is rinsed with clean water. The passivation process temperature is not less than 80°C, and a layer of carrier is formed on the surface. The passivation film plays a role in lubrication and rust prevention.

9. A process for producing super-large diameter steel strands according to claim 6, characterized in that: The twisting is carried out with a twist pitch of 12.5 times, and a V-groove design is adopted with a groove width of 38mm and a groove depth of 42mm. The inner hole of the wire pressing die used in the twisting process is 36mm.

10. A process for producing super-large diameter steel strands according to claim 6, characterized in that: In the stabilization process, the tempering temperature is 405-415°C, the running speed of the production line is lower than 9m / min, and the tension of the steel strand is controlled at 30%-35% of the threshold force of the steel strand; the cooling after tempering adopts a direct cooling immersion cooling method.

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