Device for measuring thickness of molten iron slag

Abstract

The utility model provides a device for measuring the thickness of molten iron slag. The device comprises a detection bracket platform, a detection device mounting seat, a radar liquid level meter and an infrared distance meter, a detection device mounting seat is arranged on the detection support platform, the detection device mounting seat is located above the ladle, and the radar liquid level meter and the infrared distance meter are mounted at the same height of the detection device mounting seat; the radar liquid level meter is used for measuring the liquid level distance from a measuring point to molten iron in the ladle, and the infrared distance meter is used for measuring the distance from the measuring point to the surface of molten iron slag in the ladle. The device is simple in structure and convenient to operate, can accurately and quickly measure the thickness of the molten iron slag, and skillfully solves the technical problems of inaccurate measurement of the thickness of the molten iron slag, large error and tedious operation in the industry.

Description

Technical Field

[0001] The utility model belongs to the technical field of measuring tools, and particularly relates to a device for measuring the thickness of molten iron slag. Background Art

[0002] Molten iron is the main metallic raw material in steelmaking production, with a consumption accounting for about 80% of steelmaking. When the molten iron produced by a blast furnace flows into a ladle, due to various factors, the surface of the molten iron will carry slag. The slag content generally accounts for about 0.5% of the weight of the molten iron, and can reach more than 1.5% at most. The more slag the molten iron carries, the higher the loss of metallic materials in steelmaking smelting. Therefore, considering steelmaking costs and molten iron quality control, it is particularly important to detect the slag content of each ladle of molten iron.

[0003] Common methods for measuring the slag content of molten iron in the industry include using a metal lead screw measurement method. By inserting a metal lead screw into the molten iron, the metal wire extending into the molten iron surface is melted, and the slag on the molten iron surface adheres to the metal rod. The thickness of the molten iron slag can be measured by measuring the length of the slag adhered to the metal rod, such as a molten iron slag thickness measuring device in CN214199922U. There is also a method of measuring the thickness of molten iron slag through buoyancy changes. The thickness of the molten iron slag is determined by the displacement and tension change during the process of lifting and lowering the measuring head, such as a device and method for measuring the thickness of molten iron slag through buoyancy changes in CN111795633A. For the above measurement methods, due to factors such as measurement personnel, measuring tools, measurement angles, temperature fluctuations of molten iron, and enrichment of carbon elements in molten iron at the iron-slag interface, the accuracy of measuring the thickness of molten iron slag is not high, and the average measurement deviation reaches 12%. Due to the low measurement accuracy, most steel mills abandon the accurate measurement of the thickness of molten iron slag and adopt a method of defaulting the slag content of molten iron by deducting 0.5% of the fixed weight of molten iron. The accurate measurement of the thickness of molten iron slag has always been a difficult problem in the industry. Another prior art CN208721011U designs a molten iron slag thickness measuring device including a measuring component, a first rangefinder, a second rangefinder, and a control device to solve the problem of low accuracy in manual measurement of the existing molten iron slag thickness. The measuring component can move up and down relative to the ladle to be measured. The measuring component includes two electrodes arranged oppositely and disconnected. The first rangefinder is used to measure the distance in the vertical direction between the measuring component at the initial position and the upper surface of the molten iron slag layer in the ladle. The second rangefinder is at least used to measure the distance in the vertical direction between the measuring component and the initial position of the measuring component when the two electrodes move downward until they just come into contact with the molten iron and conduct electricity. The control device is used to control the up and down movement of the measuring component and calculate the thickness of the molten iron slag according to the detection results of the two rangefinders. In this technology, the accuracy of the measurement result of the thickness of the molten iron slag has been improved to a certain extent, but the device structure is complex, the operation is cumbersome, and the result of the thickness of the molten iron slag cannot be obtained quickly and accurately. Summary of the Utility Model

[0004] In view of the above technical problems, the present utility model provides a device for measuring the thickness of molten iron slag. The device has a simple structure and is easy to operate. It can accurately and quickly measure the thickness of molten iron slag, and ingeniously solves the technical problems of inaccurate measurement, large error, and cumbersome operation in the industry for measuring the thickness of molten iron slag.

[0005] The technical solution adopted by the present utility model to solve its technical problems is as follows:

[0006] A device for measuring the thickness of molten iron slag includes a detection support platform, a detection device mounting seat, a radar level gauge, and an infrared rangefinder.

[0007] The detection support platform is provided with a detection device mounting seat. The detection device mounting seat is located above the ladle. The radar level gauge and the infrared rangefinder are installed at the same height on the detection device mounting seat. The radar level gauge is used to measure the liquid level distance from the measurement point to the molten iron in the ladle, and the infrared rangefinder is used to measure the distance from the measurement point to the surface of the molten iron slag in the ladle.

[0008] In the above solution, a controller is further included. The controller is respectively connected to the radar level gauge and the infrared rangefinder. The controller is used to calculate the thickness of the molten iron slag according to the detection results of the radar level gauge and the infrared rangefinder.

[0009] Furthermore, the controller is a PLC controller.

[0010] In the above solution, a ladle car and a ladle car track are further included. The ladle car is located on the ladle car track. The ladle is placed on the ladle car.

[0011] In the above solution, the detection support platform is L-shaped. One end of the detection support platform is fixed to the ground, and the other end is located above the ladle and installs the detection device mounting seat.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The present utility model has a simple structure, is easy to operate, has a small error, can accurately and quickly measure the thickness of molten iron slag, and ingeniously solves the technical problems of inaccurate measurement, large error, and cumbersome operation in the industry for measuring the thickness of molten iron slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0015] Figure 1 is a schematic diagram of the device for measuring the thickness of molten iron slag according to an embodiment of the present utility model;

[0016] In the figure: 1. Ladle car track; 2. Detection support platform; 3. Ladle car; 4. Ladle; 5. Molten iron; 6. Molten iron slag; 7. Detection device mounting seat; 8. Radar level gauge; 9. Infrared rangefinder. Detailed implementation mode

[0017] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "front", "rear", "left", "right", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] As Figure 1 shown, it is a preferred embodiment of the device for measuring the thickness of molten iron slag according to the present invention. The device for measuring the thickness of molten iron slag includes a detection support platform 2, a detection device mounting seat 7, a radar level gauge 8, and an infrared rangefinder 9;

[0021] A detection device mounting base 7 is provided on the detection support platform 2. The detection device mounting base 7 is located above the ladle 4. The radar level gauge 8 and the infrared distance meter 9 are installed at the same height on the detection device mounting base 7. The radar level gauge 8 is used to measure the liquid level distance from the measuring point to the molten iron 5 in the ladle 4, and the infrared distance meter 9 is used to measure the distance from the measuring point to the surface of the molten iron slag 6 in the ladle 4.

[0022] In a specific embodiment of the present utility model, it further includes a ladle car 3 and a ladle car track 1. The ladle car 3 is located on the ladle car track 1. The ladle 4 is placed on the ladle car 3.

[0023] In a specific embodiment of the present utility model, the detection support platform 2 is L-shaped. One end of the detection support platform 2 is fixed to the ground, and the other end is located above the ladle 4 and is provided with the detection device mounting base 7.

[0024] In a specific embodiment of the present utility model, the radar wave of the radar level gauge 8 measures the liquid level distance H1 from the measuring point to the molten iron 5 in the ladle 4, and the infrared ray of the infrared distance meter 9 measures the distance H2 from the measuring point to the surface of the molten iron slag 6 in the ladle 4. By manually calculating H1 minus H2, the thickness of the molten iron slag can be accurately obtained.

[0025] In a specific embodiment of the present utility model, it further includes a controller. The controller is respectively connected to the radar level gauge 8 and the infrared distance meter 9. The radar level gauge 8 and the infrared distance meter 9 respectively send the detected signals to the controller, and the controller automatically calculates the thickness of the molten iron slag according to the detection results of the radar level gauge 8 and the infrared distance meter 9.

[0026] Preferably, the controller is a PLC controller, and the PLC controller can be installed on the detection device mounting base 7.

[0027] The present utility model combines the radar electromagnetic wave of the radar level gauge 8 for measuring the metal liquid level and the laser infrared ray ranging of the infrared distance meter 9 to accurately measure the thickness of the molten iron slag. By simultaneously emitting the radar electromagnetic wave and the laser infrared ray on the detection device mounting base 7 fixed at the same height, the liquid level distance from the measuring point to the molten iron 5 in the ladle 4 and the distance from the measuring point to the surface of the molten iron slag 6 in the ladle 4 are measured. The difference between the two distances is the thickness of the molten iron slag.

[0028] The principle of the radar electromagnetic wave for measuring the metal liquid level is as follows:

[0029] Using the radar level gauge 8, the liquid level height is determined by the time difference of the radar wave returning to the sensor after reflection from the surface of the metal object. The radar level gauge 8 emits a short-pulse microwave signal, which is transmitted through the antenna and received by the liquid level surface of the hot metal 5. The presence of the liquid level surface causes part of the microwave signal to be reflected back to the sensor. After the sensor receives the reflected microwave signal, it can calculate the distance from the radar level gauge 8 to the liquid level surface of the hot metal 5 in the ladle 4.

[0030] The principle of the laser infrared ranging is as follows:

[0031] Based on the principle that the intensity of the infrared signal reflected differently at different distances when encountering an obstacle, the distance of the obstacle is detected. The infrared rangefinder 9 is an infrared ranging sensor, which has a pair of infrared signal transmitting and receiving diodes. The transmitting diode emits an infrared signal of a specific frequency, and the receiving diode receives this frequency of infrared signal. When the infrared detection direction encounters an obstacle, the infrared signal is reflected back and received by the receiving diode. After processing, it can be returned through the digital sensor interface, and the distance of the measured obstacle can be identified using the returned infrared signal, that is, the distance from the infrared rangefinder 9 to the surface of the hot metal slag 6 in the ladle 4.

[0032] The utility model utilizes the different physical and chemical properties of the hot metal 5 and the hot metal slag 6 to measure the distance of the metal liquid level by radar electromagnetic wave and the distance to the surface of the hot metal slag 6 by laser infrared ranging at the same height simultaneously. The thickness of the hot metal slag can be obtained by the difference between the two distance measurements.

[0033] The basic process of detecting the thickness of the hot metal slag in the utility model:

[0034] (1) Tapping of hot metal: After the ladle car 3 drives to the tapping position and finishes tapping the hot metal, due to the different densities of the hot metal 5 and the hot metal slag 6, the hot metal slag 6 floats and naturally flows on the surface of the hot metal 5.

[0035] (2) Measurement: After the ladle car 3 moves to the position to be measured through the ladle car track 1, the measurement starts. The device is started, and the radar level gauge 8 and the infrared rangefinder 9 respectively emit radar waves and infrared rays simultaneously. Among them, the radar wave of the radar level gauge 8 measures the liquid level distance H1 from the measurement point to the hot metal 5 in the ladle 4, and the infrared ray of the infrared rangefinder 9 measures the distance H2 from the measurement point to the surface of the hot metal slag 6 in the ladle 4. The thickness of the hot metal slag can be accurately obtained by subtracting H2 from H1. After the measurement is received, the ladle 4 leaves the measurement position and is transported to the steelmaking process.

[0036] In the detection of the thickness of the hot metal slag, when the ladle 4 is stationary, the radar level gauge 8 and the infrared rangefinder 9 can obtain a relatively high-precision thickness of the hot metal slag by detecting once, or can be detected multiple times and the average value is taken to further reduce the error.

[0037] To verify the accuracy of the device for measuring the thickness of molten iron slag, on a 120-ton molten iron ladle 4, the thickness data of molten iron slag was measured for 50 consecutive ladles of molten iron 5 through this device for measuring the thickness of molten iron slag. For each ladle of molten iron 5, the total amount of slag-carrying molten iron was calculated to be 38.7 tons according to the diameter of the ladle opening and the density of molten iron slag. After the slag 6 of the 50 ladles of molten iron 5 was skimmed off using the steelmaking KR process, the weight of the slag in the slag basin after skimming was weighed to be 39.1 tons. Through verification, the error was 1%. It can be seen that the structure of the device for measuring the thickness of molten iron slag is simple and the operation is convenient. It can eliminate the interference of various factors such as the measurer, measuring tool, measuring angle, and molten iron reasons, with small error, and can accurately and quickly measure the thickness of molten iron slag, skillfully solving the technical problems of inaccurate measurement, large error, and cumbersome operation in the industry for measuring the thickness of molten iron slag.

[0038] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for measuring the thickness of molten iron slag, characterized in that, It includes a detection support platform (2), a detection device mounting base (7), a radar level gauge (8) and an infrared rangefinder (9); The detection device mounting base (7) is provided on the detection support platform (2). The detection device mounting base (7) is located above the ladle (4). The radar level gauge (8) and the infrared rangefinder (9) are installed at the same height on the detection device mounting base (7). The radar level gauge (8) is used to measure the liquid level distance from the measurement point to the molten iron (5) in the ladle (4), and the infrared rangefinder (9) is used to measure the distance from the measurement point to the surface of the molten iron slag (6) in the ladle (4).

2. The device for measuring the thickness of molten iron slag according to claim 1, characterized in that It further includes a controller. The controller is respectively connected to the radar level gauge (8) and the infrared rangefinder (9). The controller is used to calculate the thickness of the molten iron slag according to the detection results of the radar level gauge (8) and the infrared rangefinder (9).

3. The device for measuring the thickness of molten iron slag according to claim 2, wherein, The controller is a PLC controller.

4. The device for measuring the thickness of molten iron slag according to claim 1, characterized in that, It further includes a ladle car (3) and a ladle car track (1). The ladle car (3) is located on the ladle car track (1). The ladle (4) is placed on the ladle car (3).

5. The device for measuring the thickness of molten iron slag according to claim 1, characterized in that, The detection support platform (2) is L-shaped. One end of the detection support platform (2) is fixed to the ground, and the other end is located above the ladle (4) and installs the detection device mounting base (7).

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