CN-122015751-A - Metallurgical slag thickness online measurement device, method and application

CN122015751ACN 122015751 ACN122015751 ACN 122015751ACN-122015751-A

Abstract

The invention relates to an on-line measuring device, method and application of metallurgical slag thickness, and belongs to the field of ferrous metallurgical process detection. The device comprises a bracket, a driving mechanism, a rigid probe, a torque and displacement sensor and a data processor. The driving mechanism drives the rigid probe to vertically penetrate through the air, slag and steel liquid layers at a constant speed, the sensor synchronously collects torque and displacement signals in real time, the data processor constructs a torque-displacement curve according to the torque and displacement signals, and the thickness of the slag is automatically calculated by identifying two torque abrupt points (corresponding to air-slag and slag-steel liquid interfaces) on the curve. The method is based on the device to realize automatic online measurement. The device is applied to metallurgical vessels such as ladles, converters or arc furnaces, and the like, so as to realize in-situ measurement. The invention is based on the direct physical resistance principle for measurement, has the advantages of good real-time performance, strong anti-interference capability, high precision, good environmental adaptability, compact structure, high safety and the like, and can provide data support for intelligent control of the smelting process.

Inventors

HAO YIJIE
ZHAO TENG
LI WEIFENG
ZHANG BO
YANG BAOHONG
HE SHAOHONG
YU JIA
WANG PENG

Assignees

中国重型机械研究院股份公司

Dates

Publication Date: 20260512
Application Date: 20260203

Claims (10)

1. An on-line measuring device for metallurgical slag thickness, comprising: A bracket; The driving mechanism is arranged on the bracket; the rigid probe (5) is connected with the power output end of the driving mechanism, is driven by the driving mechanism to perform uniform linear motion along the vertical direction and is used for sequentially passing through the air zone (9), the slag layer (8) and the molten steel layer (7) in the measuring process; The torque sensor is used for detecting output torque generated by the driving mechanism in the process of driving the rigid probe (5) to move in real time; The displacement sensor is used for detecting the displacement of the rigid probe (5) in the vertical direction in real time; And the data processor (10) is in signal connection with the torque sensor and the displacement sensor, is used for receiving and processing the real-time signals of the output torque and the displacement, constructs a torque-displacement relation curve reflecting the change of the output torque along with the displacement based on the real-time signals, and identifies a first torque abrupt change point corresponding to the rigid probe (5) entering the slag layer (8) from the air zone (9) and a second torque abrupt change point entering the molten steel layer (7) from the slag layer (8) through analysis of the torque-displacement relation curve, and calculates the thickness of the slag layer (8) according to the displacement values corresponding to the first torque abrupt change point and the second torque abrupt change point.
2. The metallurgical slag thickness online measuring device of claim 1, wherein the drive mechanism comprises: a servo motor (1); The input end of the speed reducer (2) is connected with the output shaft of the servo motor (1); The ball screw (3) is arranged along the vertical direction, the bottom end of the ball screw is coaxially connected with the rigid probe (5), and the ball screw (3) is restrained to be capable of moving only along the axial direction through an anti-rotation mechanism arranged on the bracket; The gear nut (4) is rotatably supported on the bracket through a bearing and sleeved on the ball screw (3), a ball screw pair is formed by the gear nut (4) and the ball screw (3), the output end of the speed reducer (2) is meshed with the gear nut (4) through a transmission mechanism so as to drive the gear nut (4) to rotate around the axis of the ball screw (3), and the rotational motion of the gear nut (4) is converted into the vertical linear motion of the ball screw (3) through the ball screw pair, so that the rigid probe (5) is driven.
3. The metallurgical slag thickness online measuring device of claim 2, wherein the transmission mechanism is a bevel gear pair.
4. The metallurgical slag thickness on-line measuring device according to claim 2, characterized in that the support is further provided with a guiding mechanism for constraining the rigid probe (5) to move only in the vertical direction.
5. The metallurgical slag thickness online measuring device of claim 4, wherein the guide mechanism comprises: And the linear guide rail pair or the guide sleeve is matched with the rigid probe (5) or the ball screw (3).
6. The metallurgical slag thickness online measuring device of claim 2, further comprising: The signal collector (11) is connected between the torque sensor, the displacement sensor and the data processor (10) and used for conditioning and analog-to-digital converting sensor signals.
7. The metallurgical slag thickness online measuring device according to claim 1, characterized in that the data processor (10) is further configured to calculate the volume and/or mass of the slag layer (8) from the calculated thickness of the slag layer (8) and the cross-sectional area of the metallurgical vessel.
8. The metallurgical slag thickness on-line measuring device according to claim 1, characterized in that the rigid probe (5) is made of a material that is resistant to high temperatures and to melt attack, including a superalloy or a ceramic material, and/or that the front end of the rigid probe (5) is tapered.
9. A method of using the metallurgical slag thickness on-line measuring device of any one of claims 1-8, comprising the steps of: starting the driving mechanism to drive the rigid probe (5) to descend at a uniform speed along the vertical direction, so that the rigid probe sequentially passes through the air zone (9), the slag layer (8) and the molten steel layer (7); the torque sensor and the displacement sensor are used for synchronously acquiring an output torque value of the driving mechanism and a displacement value of the rigid probe (5) in real time; transmitting the acquired torque signal and displacement signal to the data processor (10); Constructing, by the data processor (10), a torque-displacement relationship from the torque signal and the displacement signal; -analyzing the torque-displacement relationship curve by means of the data processor (10), identifying a first torque jump corresponding to the entry of the rigid probe (5) from the air zone (9) into the slag layer (8) and a second torque jump from the slag layer (8) into the molten steel layer (7); and calculating the thickness of the slag layer (8) according to the displacement values corresponding to the first torque abrupt change point and the second torque abrupt change point.
10. Use of an on-line metallurgical slag thickness measuring device according to any one of claims 1-8, characterized in that the on-line metallurgical slag thickness measuring device is mounted in a metallurgical vessel with the measuring path of the rigid probe (5) passing through the inner space of the metallurgical vessel for on-line measuring the thickness of a slag layer (8) above the melt in the metallurgical vessel; The metallurgical vessel is a ladle (6), a converter or an electric arc furnace.

Description

Metallurgical slag thickness online measurement device, method and application Technical Field The invention belongs to the technical field of ferrous metallurgy process detection, and particularly relates to an on-line measuring device and method for metallurgical slag thickness and application. Background In the ferrous metallurgy process, the thickness of slag is a key parameter for measuring smelting state, controlling molten steel components and guaranteeing molten steel quality. The thickness of the slag is accurately mastered, and the smelting process is regulated and controlled according to the thickness, so that the oxidability of molten steel can be effectively reduced, the alloy consumption is reduced, and the steel qualification rate is improved. Currently, slag thickness measurement techniques mainly include manual sampling, ultrasonic measurement, radiometric measurement, electromagnetic induction, and the like. According to the manual sampling method, a sampling rod is inserted into a smelting gap, and the thickness is judged according to slag layer marks attached to the rod body. The method has obvious hysteresis, cannot reflect the thickness change of slag in real time, and has safety risks such as high temperature, splashing and the like in the operation process. Ultrasonic measurement utilizes the difference in propagation velocity of ultrasonic waves in different media to achieve measurement. However, the slag has the characteristics of high temperature, multiple phases, strong corrosion, non-uniformity and the like, the attenuation of ultrasonic waves in a slag layer is serious, the measurement accuracy is easily affected by factors such as slag components, bubble content and the like, and the error is larger under the complex smelting working condition. The radiation measurement method is based on the intensity attenuation difference of the radiation after penetrating through different media, although the accuracy is higher, the radiation has radioactivity, a complex protection device is required to be equipped, the equipment cost is high, potential risks exist for the health of operators, and the radiation measurement method is difficult to be widely applied to small and medium-scale steel enterprises. The electromagnetic induction rule is greatly influenced by the temperature, the components and the magnetic field interference of molten steel, has insufficient measurement stability and is difficult to meet the requirement of high-precision measurement. In summary, the existing slag thickness measurement technology has the problems of poor real-time performance, insufficient precision, low safety or high cost, and is difficult to adapt to the production requirements of high efficiency, accuracy and safety in the ferrous metallurgy process, and a novel slag thickness online measurement technology is needed. Disclosure of Invention The invention aims to provide an on-line measuring device, an on-line measuring method and an application of metallurgical slag thickness, so as to overcome the technical defects. In order to solve the above technical problems, on one hand, in an embodiment of the present application, an on-line measuring device for thickness of metallurgical slag is provided, including: A bracket; The driving mechanism is arranged on the bracket; The rigid probe is connected with the power output end of the driving mechanism, is driven by the driving mechanism to perform uniform linear motion along the vertical direction and is used for sequentially passing through the air zone, the slag layer and the liquid steel layer in the measuring process; The torque sensor is used for detecting the output torque generated by the driving mechanism in the process of driving the rigid probe to move in real time; the displacement sensor is used for detecting the displacement of the rigid probe in the vertical direction in real time; and the data processor is in signal connection with the torque sensor and the displacement sensor and is used for receiving and processing the real-time signals of the output torque and the displacement, constructing a torque-displacement relation curve reflecting the change of the output torque along with the displacement based on the real-time signals, identifying a first torque abrupt change point corresponding to the rigid probe entering the slag layer from the air area and a second torque abrupt change point corresponding to the rigid probe entering the molten steel layer from the slag layer through analysis of the torque-displacement relation curve, and calculating the thickness of the slag layer according to the displacement values corresponding to the first torque abrupt change point and the second torque abrupt change point. According to an on-line measuring device of metallurgical slag thickness, the actuating mechanism includes: A servo motor; the input end of the speed reducer is connected with the output shaft of the servo motor; The ball screw is