Method for centering tundish collector nozzle to crystallizer

Abstract

The invention relates to a method for centering a tundish collector nozzle to a crystallizer, which adopts a set of automatic centering system to directly control a tundish vehicle to center an oil cylinder, and the automatic centering system comprises a control system, a pulling speed acquisition device and a crystallizer temperature acquisition device; the crystallizer temperature acquisition device comprises a plurality of meniscus thermocouples which are arranged in pairs on the inner arc and the outer arc of the crystallizer; the pulling speed collecting device, the crystallizer temperature collecting device and the centering oil cylinder are all connected with the control system. The pulling speed collecting device is used for collecting the pulling speed in real time, the crystallizer temperature collecting device is used for obtaining the temperature difference between the inner arc and the outer arc of the crystallizer, and the control system is used for receiving the real-time pulling speed and the temperature difference data between the inner arc and the outer arc of the crystallizer, judging whether centering is conducted or not according to the temperature difference and controlling the centering oil cylinder according to a preset mode so that a tundish collector nozzle can be centered with the crystallizer. The temperature difference between the inner arc and the outer arc of the crystallizer is used for judging the centering condition of the collector nozzle, the position of the tundish collector nozzle is controlled in real time according to the temperature difference, and the casting blank quality problem caused by poor centering of the tundish collector nozzle and the crystallizer is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of steel production and relates to a method for centering a crystallizer with a lower water outlet of a tundish. Background Art

[0002] At present, in continuous casting production, the method of centering the tundish outlet on the crystallizer is only to be roughly centered by the operator through naked eye judgment when the tundish car is driven to the casting position during the start-up operation. Since the tundish and the tundish car are not tightly connected, there will be differences in the position every time a new tundish is replaced, and there will also be differences in the centering judgment by each person through naked eye observation. Because of these differences, sticking alarms are often frequently issued, and even the quality problems of the ingot may be caused. Therefore, a method is needed to accurately center the tundish outlet on the crystallizer. Summary of the invention

[0003] In view of this, the object of the present invention is to solve the above-mentioned problem and provide a method for centering the crystallizer with the lower water outlet of the tundish.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A method for centering a tundish outlet on a crystallizer, using an automatic centering system to directly control a tundish car centering cylinder, the automatic centering system comprising a control system, a pulling speed collection device, and a crystallizer temperature collection device;

[0006] The crystallizer temperature collection device comprises a plurality of meniscus thermocouples arranged in pairs on the inner and outer arcs of the crystallizer;

[0007] The pulling speed collection device, the crystallizer temperature collection device, and the centering cylinder are all connected to the control system; the pulling speed collection device is used to collect the pulling speed in real time, the crystallizer temperature collection device is used to obtain the temperature difference between the inner and outer arcs of the crystallizer, and the control system is used to receive the real-time pulling speed and the temperature difference data between the inner and outer arcs of the crystallizer, and judge whether it is aligned according to the temperature difference, and control the centering cylinder in a preset manner to align the water outlet of the tundish with the crystallizer.

[0008] Furthermore, the position of the centering cylinder of the tundish car is pre-calibrated, and the rough alignment is completed when the tundish car is driven to the casting position; when the pulling speed is increased to the target cycle pulling speed for 3 minutes, if the temperature difference between the inner and outer arcs of the crystallizer is greater than 2°C, the position of the tundish outlet is adjusted by the centering cylinder to make the temperature difference between the inner and outer arcs of the crystallizer ≤2°C.

[0009] Furthermore, when adjusting the position of the water outlet of the tundish, the centering cylinder is controlled to push the tundish at 1 mm / s to adjust the position of the water outlet of the tundish.

[0010] Furthermore, the automatic centering system also includes an audible and visual alarm, which starts to alarm when the temperature difference between the inner and outer arcs of the crystallizer is greater than 2°C.

[0011] The beneficial effects of the present invention are:

[0012] The present invention uses the temperature difference between the inner and outer arcs of the crystallizer to determine the centering of the water outlet: when the water outlet is located in the middle of the inner and outer arcs, the temperatures of the inner and outer arcs are the same; when the water outlet is located toward either side of the inner and outer arcs, the temperature of that side is higher than the other side. The position of the water outlet of the tundish is controlled in real time according to the temperature difference to avoid the quality problem of the casting billet caused by the poor centering of the water outlet of the tundish and the crystallizer.

[0013] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0015] Figure 1 The present invention is a flow chart of the method for centering the crystallizer with the lower water outlet of the tundish.

[0016] Figure 2 Schematic diagram of the position relationship between the tundish outlet and the crystallizer.

[0017] Figure 3 for Figure 2 Top view of the .

[0018] Figure numerals: 1-crystallizer; 2-water outlet of tundish. DETAILED DESCRIPTION

[0019] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0020] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0021] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] See also Figures 1 to 3 , which is a method for centering the crystallizer at the water outlet of the tundish, using an automatic centering system to directly control the centering cylinder of the tundish car, and the automatic centering system includes a control system, a pulling speed collection device, and a crystallizer temperature collection device;

[0023] The crystallizer temperature collection device comprises a plurality of meniscus thermocouples arranged in pairs on the inner and outer arcs of the crystallizer 1;

[0024] The pulling speed collection device, the crystallizer temperature collection device, and the centering cylinder are all connected to the control system; the pulling speed collection device is used to collect the pulling speed in real time, and the crystallizer temperature collection device is used to obtain the temperature difference between the inner and outer arcs of the crystallizer 1. The control system is used to receive the real-time pulling speed and the temperature difference data of the inner and outer arcs of the crystallizer 1, and judge whether it is aligned according to the temperature difference, and control the centering cylinder in a preset manner to align the lower water outlet 2 of the tundish with the crystallizer 1.

[0025] The specific implementation steps are as follows:

[0026] 1. Pre-calibrate the position of the centering cylinder of the tundish car, and complete the rough centering when the tundish car is driven to the casting position;

[0027] 2. When the pulling speed reaches the target cycle pulling speed for 3 minutes, if the temperature difference between the 4 meniscus thermocouples in the middle of the inner arc and the 4 meniscus thermocouples in the middle of the outer arc is greater than 2°C, the sound and light alarm will start to alarm;

[0028] 3. The centering cylinder is fine-tuned to control the temperature difference between the inner and outer arcs to ≤2°C;

[0029] 4. When the temperature difference between the inner and outer arcs is ≤2°C, the tundish outlet 2 and the crystallizer 1 are aligned;

[0030] 5. As the flow field in the crystallizer 1 changes, the position of the tundish outlet 2 is adjusted in time for real-time alignment.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for centering a crystallizer with a tundish outlet, characterized in that: An automatic centering system is used to directly control the centering cylinder of the tundish car. The automatic centering system includes a control system, a casting speed collection device, and a crystallizer temperature collection device. The crystallizer temperature collection device comprises a plurality of meniscus thermocouples arranged in pairs on the inner and outer arcs of the crystallizer; The pulling speed collection device, the crystallizer temperature collection device, and the centering cylinder are all connected to the control system; the pulling speed collection device is used to collect the pulling speed in real time, the crystallizer temperature collection device is used to obtain the temperature difference between the inner and outer arcs of the crystallizer, and the control system is used to receive the real-time pulling speed and the temperature difference data between the inner and outer arcs of the crystallizer, and judge whether it is aligned according to the temperature difference, and control the centering cylinder in a preset manner to align the water outlet of the tundish with the crystallizer.

2. The method for centering the crystallizer at the tundish outlet according to claim 1, characterized in that: The position of the centering cylinder of the tundish car is calibrated in advance, and the rough alignment is completed when the tundish car is driven to the casting position; when the pulling speed is increased to the target cycle pulling speed for 3 minutes, if the temperature difference between the inner and outer arcs of the crystallizer is greater than 2°C, the position of the tundish outlet is adjusted by the centering cylinder to make the temperature difference between the inner and outer arcs of the crystallizer ≤2°C.

3. The method for centering the crystallizer at the tundish outlet according to claim 2, characterized in that: When adjusting the position of the water outlet of the tundish, control the centering cylinder to push the tundish at 1mm / s to adjust the position of the water outlet of the tundish.

4. The method for centering a crystallizer with a tundish outlet according to claim 1, characterized in that: The automatic centering system also includes an audible and visual alarm. When the temperature difference between the inner and outer arcs of the crystallizer is greater than 2°C, the audible and visual alarm starts to sound.

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