Device for measuring height of liquid level in converter hearth

Abstract

The utility model relates to the technical field of liquid level height measurement in a converter hearth. The device for measuring the height of the liquid level in the converter hearth comprises a floating body, a suspension cable and a winch assembly. One end of the suspension cable is connected to the winch assembly, and the other end of the suspension cable is connected to the floating body. And the suspension cable and the floating body enter the hearth through the upper part of the hearth nitrogen seal. The density of the floating body is smaller than that of liquid contained in the hearth. And the winch assembly is used for winding and unwinding the suspension cable, so that the suspension cable is just in a tensioned state while the floating body floats on the liquid level, and the height of the liquid level in the hearth is further measured. According to the utility model, the height of the liquid level of the molten steel in the converter hearth can be conveniently measured without the time-consuming and labor-consuming measurement modes such as binding an oxygen lance on the lance head of the oxygen lance. In addition, measurement can be conducted by remotely operating the winch assembly, the situation that workers need to make contact with parts such as an oxygen lance after molten iron is added into the converter can be avoided, the risk of high-temperature scalding is reduced, and the labor intensity is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring the liquid level in a converter furnace, in particular to a device for measuring the liquid level in a converter furnace. Background Art

[0002] In the oxygen converter steelmaking process, the converter steel liquid level is a very important parameter and the determining factor of the actual control gun position of the oxygen lance. It is not only related to the technical and economic indicators of steelmaking, but also a key factor in converter production and safety. In steelmaking production, the converter steel liquid level height value H2 is manually entered into the computer system by measuring data, so as to control the difference between the oxygen lance nozzle and the input H2 and the gun position value to control the blowing process and the activity of the slag. Due to the continuous erosion of the converter lining by the slag and the continuous flushing of the high-temperature gas in actual production, the furnace type is constantly changing, and the actual height value of the steel liquid level will have a certain deviation from the previous input value H2. If the actual value of the steel liquid level height value H is larger than the previous input value H2, the actual gun position will be lower than the gun position displayed by the computer, resulting in difficulties in on-site steelmaking slag removal, reduced dephosphorization efficiency, increased difficulty in operation, and even oxygen lance leakage and other gun burning accidents, and even serious safety accidents such as explosions. If the actual value of the molten steel level height H is smaller than the previous input value H2, the actual gun position will be higher than the gun position displayed by the computer, causing FeO accumulation during the on-site steelmaking process and causing splashing and other safety accidents. Therefore, the molten steel level position needs to be measured and corrected at regular intervals. Ensuring that the input value of the converter steel level is as close as possible to the actual value is an important guarantee for safe production.

[0003] In the prior art, the following method is used to measure the height of the molten steel level: after the converter is charged with iron, the converter is shaken to the zero position, an oxygen blowing pipe is tied with iron wire on the outer circumference of the oxygen lance tip or a slender and straight iron wire is arranged in the nozzle hole, and then the oxygen lance tip is lowered to a certain height (set the lance position H0), and the lance is raised after staying for about 5 seconds. The oxygen blowing pipe or iron wire in front of the oxygen lance nozzle will melt when entering the liquid iron, and the remaining part that has not entered the molten iron will be retained in the front part of the lance tip. After the oxygen lance is raised out of the nitrogen sealing port, the oxygen blowing pipe or iron wire is taken out, and the distance L0 from the unmelted part to the lance tip is measured. The measured value of the converter liquid level is H0-L0.

[0004] In the above method, after the oxygen blowing pipe or the iron wire is melted, the oxygen lance needs to be lifted to the nitrogen sealing port and then lowered again for blowing, which wastes time and is inconvenient to operate, resulting in reduced production efficiency and room for improvement. Utility Model Content

[0005] In order to conveniently measure the height of the liquid level in a converter, the present application provides a device for measuring the height of the liquid level inside a converter furnace.

[0006] The device for measuring the liquid level inside the converter furnace provided by the utility model adopts the following technical scheme:

[0007] A device for measuring the liquid level inside a converter furnace comprises a floating body, a suspension cable and a hoisting assembly; wherein one end of the suspension cable is connected to the hoisting assembly, and the other end is connected to the floating body; the suspension cable and the floating body enter the furnace through the top of the furnace nitrogen sealing port; the density of the floating body is less than the density of the liquid contained in the furnace; the hoisting assembly is used to retract and release the suspension cable, so that the suspension cable is in a tensioned state while the floating body floats on the liquid surface, thereby measuring the height of the liquid level inside the furnace.

[0008] Optionally, the floating body is spherical; the floating body includes a core and a protective layer; the core is an iron core; and the protective layer is an aluminum oxide layer, a magnesium oxide layer, a silicon dioxide layer or a slag layer.

[0009] Optionally, the hoisting cable includes a base section, a connecting section and a quick connecting component; one end of the base section is connected to the winch assembly, and the other end is connected to one end of the connecting section through a quick connecting component; one end of the connecting section away from the base section is connected to the floating body; the quick connecting component is used for quick connection and quick disconnection between the base section and the connecting section.

[0010] Optionally, the suspension cable has a weak portion; the weak portion divides the suspension cable into a base section and a connecting section along the length direction; the end of the base section away from the weak portion is connected to the winch assembly; the end of the connecting section away from the weak portion is connected to the floating body; the weak portion is sufficient to bear the weight of the floating body, but is more easily broken by external force than the base section and the connecting section.

[0011] Optionally, a ruler is provided on the suspension cable; the ruler is used to intuitively display the height of the molten steel level in the furnace.

[0012] Optionally, the hoisting assembly includes a hand-cranked winch or an electric winch.

[0013] As described above, the device for measuring the liquid level inside the converter furnace of the utility model has at least the following beneficial effects:

[0014] 1. The utility model controls the winding and unwinding of the suspension cable through a winch assembly, so that the floating body just floats on the surface of the molten steel, and thus the height of the molten steel level in the furnace can be conveniently measured without the need for time-consuming and laborious methods such as tying an oxygen blowing pipe or iron wire to the oxygen lance head for measurement.

[0015] 2. The winch assembly of the utility model can be remotely operated, which avoids the need for workers to contact oxygen lances and other components after adding molten iron to the converter, thereby reducing the risk of high-temperature burns and reducing labor intensity.

[0016] 3. After the measurement is completed, the staff can simply and directly disconnect the base section and the connecting section of the suspension cable. There is no need to remove the floating body from the furnace body through the suspension cable, which further avoids the risk of high temperature burns and reduces labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is used to embody the schematic diagram of the structure of a device capable of conveniently measuring the liquid level of a converter.

[0018] Figure 2 It is a schematic diagram of an embodiment of the utility model for embodying a quick connection component.

[0019] Figure 3 It is a schematic diagram of an embodiment of the utility model for reflecting a weak part.

[0020] Figure numerals: 1. furnace; 2. floating body; 3. suspension cable; 31. foundation section; 32. connection section; 33. quick connection component; 331. connection block; 34. weak part; 4. winch assembly; 5. nitrogen seal. DETAILED DESCRIPTION

[0021] The following describes the implementation of the present invention through 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 implementations, 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 following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0023] Please refer to Figure 1 The utility model discloses a device for measuring the liquid level inside a converter furnace, comprising a floating body 2, a hoisting cable 3 and a hoisting assembly 4. One end of the hoisting cable 3 is connected to the hoisting assembly 4, and the other end is connected to the floating body 2. The hoisting cable 3 and the floating body 2 enter the furnace 1 through a nitrogen seal port 5. The density of the floating body 2 is less than the density of the liquid contained in the furnace. The hoisting assembly 4 is used to retract and release the hoisting cable 3, so that the floating body 2 floats on the surface of the molten steel while the hoisting cable 3 is just in a tensioned state, thereby measuring the height of the molten steel level in the furnace 1.

[0024] It should be noted that the nitrogen seal 5 is used to seal the furnace 1. Its main function is to inject nitrogen into the furnace 1 through the nitrogen seal 5 during the process of tapping the converter to prevent the molten steel from reacting with oxygen in the air to produce an oxidation reaction, thereby improving the quality of the molten steel. The nitrogen seal 5 is set on a platform directly above the furnace 1, and the height is a fixed value.

[0025] The liquid usually contained in the furnace 1 is molten steel, so the following description is made by taking the case where the liquid contained in the furnace 1 is molten steel as an example. Specifically, since the density of the float 2 is less than the density of the molten steel, the float 2 can always float above the surface of the molten steel. The shape of the float 2 can be designed into various shapes, but since when the float 2 floats on the surface of the molten steel, one part is below the liquid surface and the other part is exposed above the liquid surface, the height of the part of the float 2 exposed above the liquid surface needs to be considered when calculating the height of the molten steel surface. In order to facilitate the measurement of the height of the part of the float 2 exposed above the liquid surface, the float 2 can adopt a regular shape, such as a sphere, a cylinder, a cube, etc.

[0026] More specifically, in this embodiment, the floating body 2 is spherical. When the sphere floats on the surface of the molten steel, no matter how it rotates, the height of the part exposed above the liquid surface is always a constant value when the density of the floating body 2, the size of the floating body 2, and the density of the molten steel remain unchanged, which is more convenient for calculation.

[0027] The floating body 2 needs to float on the surface of the molten steel, so its material needs to be resistant to high temperatures to avoid deformation or even damage during the measurement process, which affects the measurement results. In this embodiment, the floating body 2 includes a core and a protective layer. The protective layer is coated on the outside of the core. The core adopts an iron core, which can be hollow or solid. When the core is solid, it is necessary to adjust the thickness of the protective layer so that the overall density of the floating body 2 is less than the density of the molten steel. The protective layer is an aluminum oxide layer, a magnesium oxide layer, a silicon dioxide layer or a slag layer. The protective layer improves the high temperature resistance of the surface of the floating body 2, prevents the floating body 2 from being deformed or damaged during the measurement process, and helps to improve the accuracy of the measurement.

[0028] After the measurement is completed, the floating body 2 does not need to be taken out from the furnace 1. The floating body 2 can be left in the furnace 1 by cutting the suspension cable 3, and can be discharged when the slag is discharged. There is no impact on the production, and there is no need to consider the safety issues caused by high temperature when taking the floating body 2 out of the furnace 1.

[0029] Please refer to Figure 2 In this embodiment, the suspension cable 3 includes a base section 31, a connection section 32 and a quick connection component 33. One end of the base section 31 is connected to the hoist assembly 4, and the other end is connected to one end of the connection section 32 through the quick connection component 33. One end of the connection section 32 away from the base section 31 is connected to the floating body 2. The quick connection component 33 is used for quick connection and quick disconnection between the base section 31 and the connection section 32.

[0030] Specifically, the quick connection component 33 includes two connection blocks 331, which are respectively installed on one end of the base section 31 and the connection section 32. A T-shaped groove is formed on one of the connection blocks 331, and a T-shaped protrusion is formed on the other connection block, and the positions of the two connection blocks 331 can be interchanged.

[0031] By providing the quick connection component 33, the base section 31 and the connection section 32 can be quickly connected and disconnected. After disconnection, a new connection section 32 with a connection block 331 is replaced and connected to the base section 31, and measurement can be performed again.

[0032] In some other embodiments of the present invention, the quick connection component 33 may also be a safety buckle, a magnetic buckle or other components, which will not be described in detail here.

[0033] Please refer to Figure 3In another embodiment of the utility model, the suspension cable 3 has a weak portion 34. The weak portion 34 divides the suspension cable 3 into a base section 31 and a connecting section 32 along the length direction. The diameter of the weak portion 34 is smaller than the diameters of the base section 31 and the connecting section 32. One end of the base section 31 away from the weak portion 34 is connected to the winch assembly 4. One end of the connecting section 32 away from the weak portion 34 is connected to the floating body 2. The weak portion 34 is sufficient to bear the weight of the floating body 2, but is more easily broken by external force than the base section 31 and the connecting section 32. The role of the weak portion 34 is to reduce the difficulty of the staff in cutting the suspension cable 3, which helps to improve the efficiency of the molten steel level detection.

[0034] Since the hoisting cable 3 needs to hoist the floating body 2 and extend it into the furnace 1 for measurement, the hoisting cable 3 needs to be made of a material with high strength and good high temperature resistance. In this embodiment, the hoisting cable 3 is made of a steel wire rope.

[0035] The hoisting assembly 4 includes a hand-cranked winch or an electric hoisting machine, both of which have the same function of retracting and unreeling the suspension cable 3. In this embodiment, the hoisting assembly 4 adopts an electric hoisting machine.

[0036] The utility model is capable of conveniently measuring the internal molten steel level of the converter. The method for measuring the molten steel level is as follows: before adding molten steel into the converter, slowly place the hoisting cable 3 with the floating body 2 into the furnace 1 from the nitrogen sealing port 5. After the molten steel is added, control the hoisting cable 3 with the floating body 2 to gradually descend. When the floating body 2 reaches the molten steel level, it no longer continues to descend due to the buoyancy, and the hoisting cable 3 becomes loose. At this time, the hoisting cable 4 is reversed, and when the hoisting cable 3 is just in a tensioned state, the hoisting cable 4 is stopped, and then the height of the molten steel level is calculated by the following formula:

[0037] H2=H3-(L3-L2)-R.

[0038] Wherein: H2 is the height of the molten steel surface; H3 is the height from the upper opening of the nitrogen sealing port 5 to the 0-meter plane, which is a fixed value for design and construction; L3 is the total length of the suspension cable 3; L2 is the length of the suspension cable 3 retained outside the furnace 1; R is the height of the portion of the floating body 2 exposed from the molten steel surface.

[0039] Furthermore, in order to save the step of on-site calculation during measurement and directly measure the height of the molten steel level in the furnace 1, a ruler is provided on the suspension cable 3. Through the scale of the ruler, the staff can directly read the height of the molten steel level in the furnace 1.

[0040] Compared with the prior art, the utility model controls the winding and unwinding of the hoisting cable 3 through the winch assembly 4, so that the floating body 2 just floats on the surface of the molten steel, and thus the height of the molten steel level in the furnace 1 can be conveniently measured without the need for time-consuming and laborious methods such as tying an oxygen blowing pipe to the oxygen gun head to perform measurement.

[0041] The device for measuring the liquid level inside the converter furnace of the utility model also has the following advantages:

[0042] The hoisting assembly 4 of the utility model can be remotely operated, so that the workers do not need to touch the oxygen lance and other components after adding molten iron to the converter, thereby reducing the risk of high-temperature burns and reducing labor intensity.

[0043] Moreover, after the measurement is completed, the staff can directly disconnect the base section 31 and the connecting section 32 of the suspension cable 3, and there is no need to remove the floating body 2 from the furnace 1 through the suspension cable 3, which further avoids the risk of high-temperature burns and reduces labor intensity.

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A device for measuring the liquid level inside a converter furnace, characterized in that: It comprises a floating body (2), a suspension cable (3) and a winch assembly (4); wherein: One end of the suspension cable (3) is connected to the hoist assembly (4), and the other end is connected to the floating body (2); The suspension cable (3) and the floating body (2) enter the interior of the furnace (1) through the top of the furnace nitrogen sealing port (5); The density of the floating body (2) is less than the density of the liquid contained in the furnace (1); The hoisting assembly (4) is used to retract and release the suspension cable (3), so that the floating body (2) floats on the liquid surface while the suspension cable (3) is in a tensioned state, thereby measuring the height of the liquid level inside the furnace (1).

2. The device for measuring the liquid level inside the converter furnace according to claim 1, characterized in that: The floating body (2) is spherical; the floating body (2) comprises a core and a protective layer; the protective layer is coated on the outside of the core; The core is an iron core; the protective layer is an aluminum oxide layer, a magnesium oxide layer, a silicon dioxide layer or a slag layer.

3. The device for measuring the liquid level inside the converter furnace according to claim 1, characterized in that: The suspension cable (3) comprises a base section (31), a connection section (32) and a quick connection component (33); One end of the base section (31) is connected to the hoisting assembly (4), and the other end is connected to one end of the connecting section (32) via a quick connecting component (33); One end of the connecting section (32) away from the base section (31) is connected to the floating body (2); The quick connection component (33) is used for quick connection and quick disconnection between the base section (31) and the connection section (32).

4. The device for measuring the liquid level inside the converter furnace according to claim 1, characterized in that: The suspension cable (3) has a weak portion (34); The weak portion (34) divides the suspension cable (3) into a base section (31) and a connection section (32) along the length direction; One end of the base section (31) away from the weak portion (34) is connected to the hoisting assembly (4); One end of the connecting section (32) away from the weak portion (34) is connected to the floating body (2); The weak portion (34) is sufficient to bear the weight of the floating body (2), but is more easily broken by external force than the base section (31) and the connecting section (32).

5. The device for measuring the liquid level inside the converter furnace according to claim 1, characterized in that: The suspension cable (3) is provided with a scale; The scale is used to visually display the height of the molten steel level in the furnace (1).

6. The device for measuring the liquid level inside the converter furnace according to claim 1, characterized in that: The hoisting assembly (4) comprises a hand-cranked winch or an electric hoisting machine.

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