A withdrawal apparatus for a vertical round billet continuous casting machine and a method of use

Abstract

The invention relates to a kind of vertical round billet continuous casting machine and use method of drawing equipment, by frame, movable arm, fixed roll, guide wheel is formed, each drawing equipment is arranged on horizontal support rail, can be moved to working position and maintenance overhaul position on horizontal support rail by guide wheel, according to the diameter of the round billet produced, the position of movable arm on frame is adjusted, telescopic drive mechanism drives movable roll to stretch forward and clamp round billet, utilize the cylindrical roll surface of fixed roll as the measurement and positioning reference of drawing machine, the concave arc roll surface of fixed roll can accurately vertically guide round billet, avoid that round billet produces larger bending deformation and groove defect;Adjustable movable arm can make the direction of clamping force on the surface of roll clamp different diameter round billet controllable, evenly distributed, avoid that round billet local stress concentration produces crack defect;Drawing equipment can move on horizontal support rail, it is convenient to overhaul and maintenance, reduce the failure rate of drawing equipment.

Description

Technical Field

[0001] This invention belongs to the field of continuous casting technology in iron and steel smelting, and particularly relates to a billet pulling device and its usage method for a vertical round billet continuous casting machine. Background Technology

[0002] The billet pulling equipment is a component of the continuous casting machine. Its front end is connected to the secondary cooling equipment and its rear end is connected to the cutting equipment. Its main function is to guide and support the billet and drive the billet to run continuously.

[0003] Vertical round billet continuous casting machines are used to produce large-diameter, high-alloy, and crack-sensitive round continuous casting billets. The billet drawing equipment uses multiple rollers for positioning, clamping, and rotation to guide, support, and drive the round billet to run vertically downward continuously.

[0004] Currently, the billet drawing equipment of vertical round billet continuous casting machines faces several problems in practical applications, including difficulty in accurately guiding the billet with rollers, uneven distribution of roller clamping force on the billet surface, and high equipment maintenance difficulty. These problems lead to bending deformation, grooves and cracks in the billet, as well as a high equipment failure rate. Analysis reveals that the current billet drawing equipment suffers from unreasonable design. First, the rollers use a full-arc shape, which makes measurement and positioning difficult, resulting in poor vertical guiding accuracy of the continuous casting machine and causing significant bending deformation defects in the billet. Furthermore, the full-arc rollers easily press deep grooves into the billet surface. Second, the clamping position of the rollers is not adjustable, causing uneven clamping force distribution and leading to localized stress concentration and cracking defects in the billet. Third, the difficulty in loading and unloading the billet drawing equipment makes maintenance and repair inconvenient, resulting in a high failure rate.

[0005] In summary, the current billet pulling equipment of vertical round billet continuous casting machines has problems such as difficulty in accurately guiding the round billet with rollers, uneven distribution of roller clamping force on the surface of the round billet, and high difficulty in equipment maintenance. These problems have become urgent issues for those skilled in the art to solve. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a billet pulling device and method for a vertical billet continuous casting machine that can accurately guide the billet and make the roller clamping force evenly distributed on the surface of the billet, while facilitating equipment maintenance and repair, thereby solving the problems of billet bending deformation, grooves and cracks, as well as high equipment failure rate.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] A billet pulling device for a vertical round billet continuous casting machine includes a frame, a movable arm mounted on the frame, a fixed roller, and guide wheels fixed to the bottom of the frame and moving along a horizontal support track. The movable arm is symmetrically arranged on both sides of the frame, and the fixed roller is centrally located on one side of the frame. Inside the movable arm, there is a movable roller and a telescopic drive mechanism for driving the movable roller to extend and retract. The movable roller is installed at the front end of the telescopic drive mechanism to ensure that the roller surface of the movable roller is in contact with the cylindrical surface of the round billet. The position of the movable arm on the frame is adjustable, while the position of the fixed roller on the frame is not adjustable. The fixed roller is also connected to a rotary drive mechanism, which drives the fixed roller to rotate and ensures that the roller surface of the fixed roller is in contact with the cylindrical surface of the round billet, thereby moving the round billet up and down.

[0009] The movable roller and the fixed roller are at the same height, and the radial center lines of the two movable rollers and the fixed roller are at an angle of 120°.

[0010] The movable and fixed rollers have the same roller surface dimensions, both being a combination roller surface composed of concave arc bodies and cylinders. The junction of the concave arc bodies and cylinders is a smooth arc transition, and the arc diameter of the concave arc roller surface is at least 40mm larger than the maximum diameter of the round billet produced by the continuous casting machine.

[0011] The length of the horizontal support track is not less than 2.5 times the overall length of the billet pulling equipment. The horizontal support track is set at the production position and maintenance and repair position of the billet pulling equipment. Before production, the position of the moving guide wheel on the horizontal support track moves the billet pulling equipment to the production position and fixes it. During maintenance and repair, the position of the moving guide wheel on the horizontal support track moves the billet pulling equipment to the maintenance and repair position.

[0012] The frame is the main framework of the billet pulling equipment. Each billet pulling equipment includes a frame, and each frame is equipped with two movable arms, one fixed roller, and four guide wheels. The middle of the billet pulling equipment is the running channel for the round billet. Several billet pulling equipment are arranged vertically from top to bottom. The movable guide wheels are positioned and fixed on the horizontal support rail. The cylindrical roller surfaces of the fixed rollers of each billet pulling equipment are on the same vertical plane. The movable rollers, driven by the telescopic drive mechanism, clamp and support the round billet together with the fixed rollers. The rotation drive mechanism rotates and drives the fixed rollers to rotate, thereby driving the round billet to run vertically downward from the middle channel formed by the fixed rollers and movable rollers.

[0013] A method for using the billet drawing equipment of the vertical round billet continuous casting machine is as follows: Adjust and fix the position of the movable arm on the frame so that the concave arc roller surfaces of the movable roller and the fixed roller are on the same circumference. The telescopic drive mechanism pushes the movable roller, and the concave arc roller surface of the movable roller presses the round billet. The round billet is clamped by the movable roller and the fixed roller. At this time, the angle α=β=γ=120° between the clamping forces acting on the round billet by the movable roller and the fixed roller is evenly distributed on the surface of the round billet, so as to avoid stress crack defects in the round billet.

[0014] Before production, the position of the movable guide wheel on the horizontal support rail moves the billet pulling equipment to the production position and fixes it. During maintenance and repair, the position of the movable guide wheel on the horizontal support rail moves the billet pulling equipment to the maintenance and repair position.

[0015] The beneficial effects of this invention are as follows: The billet pulling equipment and its usage method for a vertical round billet continuous casting machine provided by this invention are reasonably designed. The cylindrical roller surface of the fixed roller serves as the measurement and positioning reference for the billet pulling machine, and the concave arc roller surface of the fixed roller serves as the vertical guide for the round billet, thus avoiding large bending deformation and groove defects in the round billet. The adjustable movable arm allows for controllable and uniformly distributed clamping force on the surface of the round billet when the rollers clamp billets of different diameters, avoiding local stress concentration and crack defects. The billet pulling equipment can be moved to the working position and maintenance position on a horizontal support track, facilitating inspection and maintenance and reducing the failure rate of the billet pulling equipment. Attached Figure Description

[0016] Figure 1 This is a front view of the invention used in production.

[0017] Figure 2 This is a top view of the invention used in production.

[0018] Figure 3 This is a side view of the invention used in production. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0020] like Figure 1 As shown, a billet pulling device for a vertical round billet continuous casting machine includes a frame 11, a movable arm 12 mounted on the frame 11, a fixed roller 13, and four guide wheels 14 fixed to the bottom of the frame 11 and movable along a horizontal support track 2. The movable arm 12 is symmetrically arranged on both sides of the frame 11, and the fixed roller 13 is centrally located on one side of the frame 11. The position of the movable arm 12 on the frame 11 is adjustable, and a telescopic drive mechanism 15 is provided inside the movable arm 12 to drive the movable roller 16 to extend and retract. The front end of the telescopic drive mechanism 15 is connected to the movable roller 16.

[0021] The movable arm 12 is mounted and fixed on the frame 11. Inside the movable arm 12, there is a movable roller 16 and a telescopic drive mechanism 15 for driving the movable roller 16 to extend and retract. The movable roller 16 is installed at the front end of the telescopic drive mechanism 15 to ensure that the rotating roller surface of the movable roller 16 is in contact with the cylindrical surface of the round blank 3. The position of the movable arm 12 on the frame 11 is adjustable, while the position of the fixed roller 13 on the frame 11 is not adjustable. The fixed roller 13 is also connected to a rotary drive mechanism 17. The rotary drive mechanism 17 drives the fixed roller 13 to rotate and ensures that the roller surface of the fixed roller 13 is in contact with the cylindrical surface of the round blank 3, thereby driving the round blank 3 to move up and down.

[0022] The movable roller 16 and the fixed roller 13 are at the same height, and the included angle between the radial center lines of the two movable rollers 16 and the fixed roller 13 is 120°.

[0023] like Figure 1 As shown, the movable roller 16 and the fixed roller 13 have the same roller surface dimensions, both being a combination roller surface composed of a concave arc body and a cylinder. The junction of the concave arc body and the cylinder is a smooth arc transition. The arc diameter of the concave arc roller surface is at least 40mm larger than the maximum diameter of the round billet produced by the continuous casting machine. Taking a maximum round billet diameter of 1000mm that the continuous casting machine can produce as an example, the suitable width of the combination roller surface is between 200mm and 400mm, and the suitable arc width of the concave arc body is between 100mm and 150mm.

[0024] like Figure 2 As shown, the length of the horizontal support rail 2 is not less than 2.5 times the overall length of the drawing equipment 1. The horizontal support rail 2 is set at both the production position and the maintenance and repair position of the drawing equipment 1. Before production, the position of the moving guide wheel 14 on the horizontal support rail 2 moves the drawing equipment 1 to the production position and fixes it. During maintenance and repair, the position of the moving guide wheel 14 on the horizontal support rail 2 moves the drawing equipment 1 to the maintenance and repair position, thus providing convenience for use and maintenance.

[0025] like Figure 3 , 2 As shown in Figure 1, the frame is the main frame of the billet pulling equipment. Each billet pulling equipment includes a frame, and each frame is equipped with two movable arms, one fixed roller, and four guide wheels. The middle of the billet pulling equipment is the running channel for the round billet. Several billet pulling equipment 1 are arranged vertically from top to bottom. The movable guide wheels 14 are positioned and fixed on the horizontal support rail 2. The cylindrical roller surfaces of the fixed rollers 13 of each billet pulling equipment 1 are on the same vertical plane. The movable rollers 16, driven by the telescopic drive mechanism 15, clamp and support the round billet 3 together with the fixed rollers 13. The rotation drive mechanism 17 rotates and drives the fixed rollers 13 to rotate, thereby driving the round billet 3 to run vertically downward from the middle channel formed by the fixed rollers 13 and the movable rollers 16.

[0026] like Figure 1 , 2 As shown in Figure 3, a method for using the billet pulling device of the vertical round billet continuous casting machine is as follows: The billet pulling device of the vertical round billet continuous casting machine is set between the secondary cooling device and the cutting device. The position of the movable arm 12 on the frame 11 is adjusted and fixed so that the concave arc roller surfaces of the movable roller 16 and the fixed roller 13 are on the same circumference. The telescopic drive mechanism 15 pushes the movable roller 16, and the concave arc roller surface of the movable roller 16 presses the round billet 3. The round billet 3 is clamped by the movable roller 16 and the fixed roller 13. At this time, the angle α=β=γ=120° between the clamping forces acting on the round billet 3 by the movable roller 16 and the fixed roller 13 solves the problem of uneven clamping force distribution and avoids stress crack defects in the round billet 3.

[0027] Before production, the position of the movable guide wheel 14 on the horizontal support rail 2 moves the billet pulling equipment 1 to the production position and fixes it. During maintenance and repair, the position of the movable guide wheel 14 on the horizontal support rail 2 moves the billet pulling equipment 1 to the maintenance and repair position.

[0028] like Figure 1 As shown, the movable roller 16 and the fixed roller 13 clamp the round blank 3. The transition section of the combined roller surface is a smooth arc transition. The edge of the combined roller surface has no sharp edges, which can avoid the formation of groove defects on the surface of the round blank 3.

[0029] Each potter's wheel is arranged on a horizontal support rail. The potter's wheel can be moved to the working position and maintenance position on the horizontal support rail via guide wheels.

[0030] A method for using a billet pulling device in a vertical round billet continuous casting machine: Before production, the billet pulling device moves to the working position on a horizontal support track. The cylindrical roller surface of the fixed roller is used as the measurement and positioning reference of the billet pulling machine, and the concave arc roller surface of the fixed roller is used as the vertical guide for the round billet. The position of the movable arm on the frame is adjusted according to the diameter of the round billet to make the intersection of the center lines of the movable roller and the fixed roller coincide with the center of the round billet. During production, when the round billet passes through the billet pulling device, the telescopic drive mechanism drives the movable roller to extend forward, so that the two movable rollers and one fixed roller clamp the round billet. The rotation drive mechanism rotates the fixed roller and drives the round billet to run vertically downward continuously. After production, the billet pulling device moves to the maintenance and repair position on the horizontal roller table for maintenance and repair.

Claims

1. A billet pulling device for a vertical round billet continuous casting machine, comprising a frame (11), a movable arm (12) mounted on the frame (11), a fixed roller (13), and four guide wheels (14) fixed to the bottom of the frame (11) and movable along a horizontal support track (2), characterized in that: The movable arms (12) are symmetrically arranged on both sides of the frame (11), and the fixed roller (13) is centrally arranged on one side of the frame (11). Inside the movable arms (12) are a movable roller (16) and a telescopic drive mechanism (15) for driving the movable roller (16) to extend and retract. The movable roller (16) is installed at the front end of the telescopic drive mechanism (15) to ensure that the rotating roller surface of the movable roller (16) is in contact with the cylindrical surface of the round blank (3). The position of the movable arm (12) on the frame (11) is adjustable, while the position of the fixed roller (13) on the frame (11) is not adjustable. The fixed roller (13) is also connected to a rotary drive mechanism (17). The rotary drive mechanism (17) drives the fixed roller (13) to rotate and ensures that the roller surface of the fixed roller (13) is in contact with the cylindrical surface of the round blank (3) to drive the round blank (3) to move up and down. The frame is the main frame of the billet pulling equipment. Each billet pulling equipment includes a frame. Each frame is equipped with two movable arms, one fixed roller and four guide wheels. The middle of the billet pulling equipment is the running channel for the round billet. Several billet pulling equipment (1) are arranged vertically from top to bottom. The movable guide wheel (14) is positioned and fixed on the horizontal support rail (2). The cylindrical roller surfaces of the fixed rollers (13) of each billet pulling equipment (1) are on the same vertical plane. The movable roller (16) is driven by the telescopic drive mechanism (15) to clamp and support the round billet (3) together with the fixed roller (13). The rotation drive mechanism (17) rotates and drives the fixed roller (13) to rotate, thereby driving the round billet (3) to run vertically downward from the middle channel formed by the fixed roller (13) and the movable roller (16). The movable roller (16) and the fixed roller (13) are at the same height, and the radial center lines of the two movable rollers (16) and the fixed roller (13) are at an angle of 120°. The movable roller (16) and the fixed roller (13) have the same roller surface size. They are both combined roller surfaces composed of concave arc bodies and cylinders. The joint between the concave arc body and the cylinder is a smooth arc transition. The arc diameter of the concave arc roller surface is at least 40mm larger than the maximum diameter of the round billet produced by the continuous casting machine.

2. The billet pulling device for a vertical round billet continuous casting machine according to claim 1, characterized in that: The length of the horizontal support track (2) is not less than 2.5 times the overall length of the billet pulling equipment (1). The horizontal support track (2) is set at the production position and maintenance position of the billet pulling equipment (1). Before production, the position of the moving guide wheel (14) on the horizontal support track (2) moves the billet pulling equipment (1) to the production position and fixes it. During maintenance, the position of the moving guide wheel (14) on the horizontal support track (2) moves the billet pulling equipment (1) to the maintenance position.

3. A method for using the billet pulling equipment of the vertical round billet continuous casting machine as described in claim 1 or 2, characterized in that: The specific method is as follows: The billet pulling equipment of the vertical round billet continuous casting machine is set between the secondary cooling equipment and the cutting equipment. The position of the movable arm (12) on the frame (11) is adjusted and fixed so that the concave arc roller surfaces of the movable roller (16) and the fixed roller (13) are on the same circumference. The telescopic drive mechanism (15) pushes the movable roller (16), and the concave arc roller surface of the movable roller (16) presses the round billet (3). The round billet (3) is clamped by the movable roller (16) and the fixed roller (13). At this time, the angle α=β=γ=120° between the clamping force of the movable roller (16) and the fixed roller (13) on the round billet (3) is evenly distributed on the surface of the round billet, so as to avoid stress crack defects in the round billet (3).

4. The method of using the billet pulling equipment of a vertical round billet continuous casting machine according to claim 3, characterized in that... Before production, the position of the guide wheel (14) on the horizontal support rail (2) is moved to the production position and fixed. During maintenance and repair, the position of the guide wheel (14) on the horizontal support rail (2) is moved to the maintenance and repair position.

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