Design method for soft centering system of continuous steel casting production line

By adopting a four-point space rectangular soft centering system on the continuous cast steel production line, and using the displacement and pressure sensor of the hydraulic cylinder centering device, the precise centering of the ingot lead rod is achieved, solving the problems of deviation and multi-sectional facets in the production line, and improving the stability and efficiency of the production line.

CN119772125APending Publication Date: 2025-04-08CHINA NAT HEAVY MACHINERY RES INSTCO
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Patent Information

Application Number
CN202411812848.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-04-08

AI Technical Summary

Technical Problem

In continuous cast steel production lines, the ingot lead rod is prone to deviation during the transportation process, and the ingot lead rod of the multi-section billet continuous casting machine is difficult to center, and the prior art is difficult to effectively solve these problems.

Method used

A four-point space rectangular soft centering system is adopted. By setting four points on the continuous casting machine, a hydraulic cylinder centering device is installed at each point, and the displacement sensors of hydraulic cylinders A and C and the pressure sensors of hydraulic cylinders B and D are used to achieve accurate centering control.

Benefits of technology

The precise centering of the two-cut position of the slab continuous casting machine is achieved, and the problem of centering the ingot rod of the multi-section square continuous casting machine is solved, which improves the stability and efficiency of the production line.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a design method of a soft centering system of a continuous steel casting production line. The method mainly relates to a slab continuous casting machine secondary cutting position casting blank centering working condition and a square billet continuous casting machine dummy ingot feeding centering working condition, and the slab continuous casting machine secondary cutting position casting blank centering working condition comprises the steps that 1, four points are arranged on a production line, and centering devices are installed on the four points; wherein the hydraulic cylinder B and the hydraulic cylinder D are used for pressure detection, and the hydraulic cylinder A and the hydraulic cylinder C are used for displacement control; 2, calibrating zero positions of the four centering devices; step 3, according to actual needs, centering slab information, and calculating an oil cylinder push-out distance by a PLC (Programmable Logic Controller); 4, the casting blank reaches a centering station, the hydraulic cylinder A and the hydraulic cylinder C are pushed out at the same time, and the hydraulic cylinder B and the hydraulic cylinder D are pushed out later for soft centering; the dummy ingot feeding and centering working condition of the billet continuous casting machine comprises the steps 1-3; and 4, after the PLC of the casting machine receives the dummy bar in-place signal, the casting blanks at the second cutting position of the same slab continuous casting machine are aligned consistently. The device adopts a four-point space rectangular soft centering mode, is simple and reliable in structure, is suitable for slab and square billet continuous casting machines, and has good replication suitability for other types of casting machines.
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Description

Technical Field

[0001] The invention relates to the technical field of continuous steel casting in the iron and steel metallurgical industry, and in particular to a design method for a soft centering system of a continuous steel casting production line. Background Art

[0002] In the continuous steel casting (continuous casting for short) production line, there are two stages: preparation for casting and production of billet drawing.

[0003] In the preparation for casting, for the bottom-loading ingot continuous casting machine, the ingot rod needs to be sent into the crystallizer. During the transportation process, the ingot rod often deviates due to the flatness of the roller. At the same time, it is often seen in China that a set of square billet continuous casting machines needs to be compatible with a large cross-section span. For example, a square billet continuous casting machine is compatible with four sections (thickness × width) 180×220, 260×300, 260×380, and 320×420. Designing ingot rods for this type of casting machine will involve the same ingot rod body, different transition sections and different ingot heads, and the width of the transport roller of the casting machine itself is a fixed value, so there will be a problem of deviation of the ingot rods used for production of different sections. At present, most steel mills can only use a crowbar to assist in guiding during the transportation of the ingot rod to achieve the purpose of centering.

[0004] During the billet drawing stage, especially for some steel mills with short-length requirements, there will be secondary cutting equipment in the slab continuous casting production line. From the first cutting of the fixed-length billet to the second cutting, in order to make the cutting seam and the billet-out direction as vertical and flat as possible, a centering system is required to solve the problem of whether the billet is straight or not.

[0005] Therefore, it is necessary to seek a simple and reliable alignment system that can adapt to different working conditions to achieve the alignment purpose and completely solve the alignment pain points. Summary of the invention

[0006] The purpose of the invention is to provide a design method for a soft centering system of a continuous steel casting production line.

[0007] The present invention is achieved through the following technical solutions:

[0008] The present invention relates to a design method for a soft centering system of a continuous steel casting production line, comprising the following steps:

[0009] (1) Slab centering condition at the second cutting position of slab continuous casting machine

[0010] Step 1, using a four-point spatial rectangular soft centering method, setting four points, and installing a centering device at each point; wherein each centering device is provided with a hydraulic cylinder, namely: hydraulic cylinder A, hydraulic cylinder B, hydraulic cylinder C, hydraulic cylinder D; hydraulic cylinder A and hydraulic cylinder C are both provided with displacement sensors, and are set on the same side; hydraulic cylinder B and hydraulic cylinder D are both provided with pressure sensors, and are set on the same side;

[0011] Step 2: Before casting, the four-point centering device is calibrated one by one. Using the edge of the conveyor roller as a scale, the auxiliary block is used to extend the hydraulic cylinder A and the hydraulic cylinder C at the same time to support the auxiliary steel block. At this time, the position of the hydraulic cylinder is the zero position of the displacement sensor, and after calibration, it meets the following formula:

[0012]

[0013] Where, Bb is the distance between the zero point position and the flow centerline after calibration, Bi is the width of the billet to be centered, and K is the stroke correction coefficient;

[0014] Step 3: hydraulic cylinder B and hydraulic cylinder D are pressure tested until the extension pressure of hydraulic cylinder B and hydraulic cylinder D reaches the target value;

[0015] Step 4: After the casting machine PLC receives the signal that the fixed-size billet is in place, the PLC calculates the cylinder push-out distance based on the current billet width and the calibrated zero position, as shown in the formula:

[0016]

[0017] Where Bi is the width of the billet to be centered, Bb is the distance between the zero point position and the flow centerline after calibration, and St is the push distance or stroke of the hydraulic cylinder;

[0018] The calculation method of cylinder stroke is:

[0019] Step 5, PLC issues a command, hydraulic cylinder A and hydraulic cylinder C extend the calculated distance St, after reaching the position, delay 2s, PLC issues a command, hydraulic cylinder B and hydraulic cylinder D push out, until Pi = Pb, after maintaining for 2s, the centering is completed, the four hydraulic cylinders retract to zero position at the same time, and proceed to the next process; wherein Pi is the real-time pressure of the hydraulic cylinder, and Pb is the target pressure value.

[0020] (2) Billet continuous casting machine ingot feeding and centering conditions

[0021] The following steps are involved:

[0022] Step 1, adopting a four-point spatial rectangular soft centering method, setting four points on each stream of the billet continuous casting machine, and installing a centering device at each point; wherein each centering device is provided with a hydraulic cylinder, namely: hydraulic cylinder A, hydraulic cylinder B, hydraulic cylinder C, hydraulic cylinder D; hydraulic cylinder A and hydraulic cylinder C are both provided with displacement sensors, and are set on the same side; hydraulic cylinder B and hydraulic cylinder D are both provided with pressure sensors, and are set on the same side;

[0023] Step 2: Before casting, the four-point centering device is calibrated one by one. Using the edge of the conveyor roller as a scale, the auxiliary block is used to extend the hydraulic cylinder A and the hydraulic cylinder C at the same time to support the auxiliary steel block. At this time, the position of the hydraulic cylinder is the zero position of the displacement sensor, and after calibration, it meets the following formula:

[0024]

[0025] Where, Bb is the distance between the zero point position and the flow centerline after calibration, Bd is the narrowest width of the dummy bar used in this continuous casting machine, and K is the stroke correction coefficient;

[0026] Step 3: hydraulic cylinder B and hydraulic cylinder D are pressure tested until the extension pressure of hydraulic cylinder B and hydraulic cylinder D reaches the target value;

[0027] Step 4: After the casting machine PLC receives the signal that the dummy rod is in place, the slab is aligned with the second cutting position of the slab continuous casting machine.

[0028] The symbols in all formulas involved in the present invention are explained as follows:

[0029] Bmax—the maximum cross-section width of the billet that can be cast by this continuous casting machine.

[0030] Bd—the narrowest width of the dummy bar used in this continuous casting machine.

[0031] S—hydraulic cylinder stroke,

[0032] T—clearance between moving frame and guide frame,

[0033] Br—transport roller length,

[0034] Bb—The distance between the zero point position and the flow center line after calibration.

[0035] Bi—width of the billet to be centered,

[0036] St—hydraulic cylinder push-out distance or stroke,

[0037] K—stroke correction coefficient,

[0038] Pi—real-time pressure of hydraulic cylinder,

[0039] Pb—target pressure value.

[0040] Preferably, the centering device comprises: a hydraulic cylinder 1, a roller assembly 2, a guide frame 3, a moving frame 4, a guide copper plate 5, and a mounting plate 6;

[0041] The hydraulic cylinder 1 is connected to the moving frame 4 , and the hydraulic cylinder 1 is extended and retracted to drive the moving frame 4 to translate along the guide copper plate 5 in the guide frame 3 .

[0042] Preferably, the gap T between the guide frame 3 and the movable frame 4 is ≥ 2 mm.

[0043] The present invention has the following advantages:

[0044] (1) The method of the present invention is designed using a centering device, which has a simple and reliable structure and is suitable for slab and billet continuous casting machines, and has good replication adaptability for other types of casting machines.

[0045] (2) The method of the present invention adopts a four-point spatial rectangular soft centering method, that is, four points are arranged in a plane for rectangular centering, each point is provided with a centering device, each centering device is provided with a hydraulic cylinder, hydraulic cylinder A and hydraulic cylinder C are provided with displacement sensors; hydraulic cylinder B and hydraulic cylinder D are provided with pressure sensors; hydraulic cylinders A and C are provided on the same side, and are arranged on the opposite side of hydraulic cylinders B and hydraulic cylinder D provided on the same side; the present invention uses a hydraulic cylinder provided with a displacement sensor to control the centering distance, and hydraulic cylinders with pressure sensors are provided at two points on the other side to accurately realize soft centering by pressure control, thereby achieving the purpose of precise centering.

[0046] (3) The method of the present invention adopts a four-point spatial rectangular soft centering method, which solves the pain point problem of two-cut centering of slab continuous casting machines; and solves the pain point problem of centering the guide rod of multi-section square billet continuous casting machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the centering device in the design method of the present invention;

[0048] Figure 2 is a cross-sectional view of the centering device in the design method of the present invention;

[0049] Figure 3 is a cross-sectional view of the centering device in the design method of the present invention;

[0050] Figure 4 It is the distribution diagram of four hydraulic cylinders of the present invention;

[0051] Figure 5 It is a working principle diagram of the present invention;

[0052] The attached drawings are marked with: 1 is the hydraulic cylinder, 2 is the roller assembly, 3 is the guide frame, 4 is the movable frame, 5 is the guide copper plate, 6 is the mounting plate, 7 is the process in which the signal of the ingot / ingot guide rod is collected by the PLC, 8 is the process in which the PLC controls the movement of the cylinder with a displacement sensor, 9 is the process in which the displacement sensor hydraulic cylinder is extended into place and the signal is fed back to the PLC, 10 is the process in which the PLC controls the extension of the opposite hydraulic cylinder, 11 is the process in which the pressure reaches the detection value, and 12 is the process in which the centering completion signal is fed back to the PLC. DETAILED DESCRIPTION

[0053] The present invention is described in detail below in conjunction with specific embodiments. It should be noted that the following embodiments are only further descriptions of the present invention, but the protection scope of the present invention is not limited to the following embodiments.

[0054] Example

[0055] This embodiment relates to a design method for a soft centering system of a continuous steel casting production line. Figure 5 As shown, the following steps are included: Figure 5 Among them, 7 is the process in which the signal of the ingot / ingot rod is collected by PLC, 8 is the process in which PLC controls the movement of the cylinder with displacement sensor, 9 is the process in which the displacement sensor hydraulic cylinder is extended into place and the signal is fed back to PLC, 10 is the process in which PLC controls the extension of the opposite hydraulic cylinder, 11 is the process in which the pressure reaches the detection value, and 12 is the process in which the centering completion signal is fed back to PLC.

[0056] (1) Slab centering condition at the second cutting position of slab continuous casting machine

[0057] Step 1: Use the four-point spatial rectangular soft centering method to set four points, and install a centering device at each point. Each centering device is equipped with a hydraulic cylinder, namely: hydraulic cylinder A, hydraulic cylinder B, hydraulic cylinder C, hydraulic cylinder D; hydraulic cylinder A and hydraulic cylinder C are both equipped with displacement sensors and are set on the same side; hydraulic cylinder B and hydraulic cylinder D are both equipped with pressure sensors and are set on the same side, see Figure 4 As shown;

[0058] Step 2: Before casting, the four-point centering device is calibrated one by one. Using the edge of the conveyor roller as a scale, the auxiliary block is used to extend the hydraulic cylinder A and the hydraulic cylinder C at the same time to support the auxiliary steel block. At this time, the position of the hydraulic cylinder is the zero position of the displacement sensor, and after calibration, it meets the following formula:

[0059]

[0060] Where, Bb is the distance between the zero point position and the flow centerline after calibration, Bi is the width of the billet to be centered, and K is the stroke correction coefficient;

[0061] Step 3: hydraulic cylinder B and hydraulic cylinder D are pressure tested until the extension pressure of hydraulic cylinder B and hydraulic cylinder D reaches the target value;

[0062] Step 4: After the casting machine PLC receives the signal that the fixed-size billet is in place, the PLC calculates the cylinder push-out distance based on the current billet width and the calibrated zero position, as shown in the formula:

[0063]

[0064] Where Bi is the width of the billet to be centered, Bb is the distance between the zero point position and the flow centerline after calibration, and St is the push stroke of the hydraulic cylinder;

[0065] Step 5: PLC issues a command to extend hydraulic cylinder A and hydraulic cylinder C to the calculated distance St. After reaching the position, there is a delay of 2s, and PLC issues a command to push hydraulic cylinder B and hydraulic cylinder D out until Pi = Pb. After 2s, the alignment is completed, and the four hydraulic cylinders are retracted to zero position at the same time to proceed to the next process.

[0066] (2) Billet continuous casting machine ingot feeding and centering conditions

[0067] The following steps are involved:

[0068] Step 1, adopting a four-point spatial rectangular soft centering method, setting four points on each stream of the billet continuous casting machine, and installing a centering device at each point; wherein each centering device is provided with a hydraulic cylinder, namely: hydraulic cylinder A, hydraulic cylinder B, hydraulic cylinder C, hydraulic cylinder D; hydraulic cylinder A and hydraulic cylinder C are both provided with displacement sensors, and are set on the same side; hydraulic cylinder B and hydraulic cylinder D are both provided with pressure sensors, and are set on the same side;

[0069] Step 2: Before casting, the four-point centering device is calibrated one by one. Using the edge of the conveyor roller as a scale, the auxiliary block is used to extend the hydraulic cylinder A and the hydraulic cylinder C at the same time to support the auxiliary steel block. At this time, the position of the hydraulic cylinder is the zero position of the displacement sensor, and after calibration, it meets the following formula:

[0070]

[0071] Where, Bb is the distance between the zero point position and the flow centerline after calibration, Bd is the narrowest width of the dummy bar used in this continuous casting machine, and K is the stroke correction coefficient;

[0072] Step 3: hydraulic cylinder B and hydraulic cylinder D are pressure tested until the extension pressure of hydraulic cylinder B and hydraulic cylinder D reaches the target value;

[0073] Step 4: After the casting machine PLC receives the signal that the dummy rod is in place, the slab is aligned with the second cutting position of the slab continuous casting machine.

[0074] The centering device comprises: a hydraulic cylinder 1, a roller assembly 2, a guide frame 3, a moving frame 4, a guide copper plate 5, and a mounting plate 6. Figure 1-Figure 3 As shown; the hydraulic cylinder 1 is connected to the moving frame 4, and the hydraulic cylinder 1 is extended and retracted to drive the moving frame 4 to translate along the guide copper plate 5 in the guide frame 3.

[0075] The gap T between the guide frame 3 and the moving frame 4 is ≥ 2 mm.

[0076] The method of the present invention is designed with a centering device, which has a simple and reliable structure, is suitable for slab and billet continuous casting machines, and has good replication adaptability for other types of casting machines. The method of the present invention adopts a four-point spatial rectangular soft centering method, that is, four-point rectangular centering is arranged in a plane, each point is provided with a centering device, each centering device is provided with a hydraulic cylinder, hydraulic cylinder A and hydraulic cylinder C are provided with displacement sensors; hydraulic cylinder B and hydraulic cylinder D are provided with pressure sensors; therefore, the present invention uses a hydraulic cylinder provided with a displacement sensor to control the centering distance, and the hydraulic cylinders provided with pressure sensors at two points on the other side use pressure control to accurately realize soft centering, which achieves the purpose of precise centering. The method of the present invention uses a four-point spatial rectangular soft centering method to solve the pain point problem of two-cut centering of slab continuous casting machines; and solves the pain point problem of centering the ingot rod of multi-section billet continuous casting machines.

[0077] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which will not affect the essence of the present invention.

Claims

1. A design method for a soft centering system of a continuous steel casting production line, characterized in that: The following steps are involved: (1) Slab centering condition at the second cutting position of slab continuous casting machine Step 1, using a four-point spatial rectangular soft centering method, setting four points, and installing a centering device at each point; wherein each centering device is provided with a hydraulic cylinder, namely: hydraulic cylinder A, hydraulic cylinder B, hydraulic cylinder C, hydraulic cylinder D; hydraulic cylinder A and hydraulic cylinder C are both provided with displacement sensors, and are set on the same side; hydraulic cylinder B and hydraulic cylinder D are both provided with pressure sensors, and are set on the same side; Step 2: Before casting, the four-point centering device is calibrated one by one. Using the edge of the conveyor roller as a scale, the auxiliary block is used to extend the hydraulic cylinder A and the hydraulic cylinder C at the same time to support the auxiliary steel block. At this time, the position of the hydraulic cylinder is the zero position of the displacement sensor, and after calibration, it meets the following formula: Where, Bb is the distance between the zero point position and the flow centerline after calibration, Bi is the width of the billet to be centered, and K is the stroke correction coefficient; Step 3: hydraulic cylinder B and hydraulic cylinder D are pressure tested until the extension pressure of hydraulic cylinder B and hydraulic cylinder D reaches the target value; Step 4: After the casting machine PLC receives the signal that the fixed-size billet is in place, the PLC calculates the cylinder push-out distance based on the current billet width and the calibrated zero position, as shown in the formula: In the formula, Bi is the width of the steel billet that needs to be centered, and St is the distance pushed out by the hydraulic cylinder; Step 5: PLC issues a command to extend hydraulic cylinder A and hydraulic cylinder C to the calculated distance St. After reaching the position, there is a delay of 2s, and PLC issues a command to push hydraulic cylinder B and hydraulic cylinder D out until Pi = Pb. After 2s, the alignment is completed, and the four hydraulic cylinders are simultaneously retracted to zero position to proceed to the next process; Pi is the real-time pressure of the hydraulic cylinder, and Pb is the target pressure value; (2) Billet continuous casting machine ingot feeding and centering conditions The following steps are involved: Step 1, adopting a four-point spatial rectangular soft centering method, setting four points on each stream of the billet continuous casting machine, and installing a centering device at each point; wherein each centering device is provided with a hydraulic cylinder, namely: hydraulic cylinder A, hydraulic cylinder B, hydraulic cylinder C, hydraulic cylinder D; hydraulic cylinder A and hydraulic cylinder C are both provided with displacement sensors, and are set on the same side; hydraulic cylinder B and hydraulic cylinder D are both provided with pressure sensors, and are set on the same side; Step 2: Before casting, the four-point centering device is calibrated one by one. Using the edge of the conveyor roller as a scale, the auxiliary block is used to extend the hydraulic cylinder A and the hydraulic cylinder C at the same time to support the auxiliary steel block. At this time, the position of the hydraulic cylinder is the zero position of the displacement sensor, and after calibration, it meets the following formula: Where, Bb is the distance between the zero point position and the flow centerline after calibration, Bd is the narrowest width of the dummy bar used in the continuous casting machine, and K is the stroke correction coefficient; Step 3: hydraulic cylinder B and hydraulic cylinder D are pressure tested until the extension pressure of hydraulic cylinder B and hydraulic cylinder D reaches the target value; Step 4: After the casting machine PLC receives the signal that the dummy rod is in place, the slab is aligned with the second cutting position of the slab continuous casting machine.

2. The design method of the soft centering system of the continuous steel casting production line according to claim 1 is characterized in that: The centering device comprises: a hydraulic cylinder (1), a roller assembly (2), a guide frame (3), a moving frame (4), a guide copper plate (5), and a mounting plate (6); The hydraulic cylinder (1) is connected to the moving frame (4), and the hydraulic cylinder (1) is extended and retracted to drive the moving frame (4) to move horizontally along the guide copper plate (5) in the guide frame (3).

3. The design method of the soft centering system of the continuous steel casting production line according to claim 2 is characterized in that: The gap T between the guide frame (3) and the movable frame (4) is ≥ 2 mm.