Device for measuring distance between oxygen lance nozzle of converter and molten steel level in converter

Abstract

The utility model discloses a device for measuring the distance between a converter oxygen lance nozzle and the molten steel level in a converter, and relates to the field of steel smelting equipment. A distance measuring device is installed on the nitrogen sealing platform and located at an opening of the oxygen lance nitrogen sealing opening, and a converter oxygen lance nozzle is arranged over the oxygen lance nitrogen sealing opening. The distance measuring device comprises an inner heat insulation layer, an outer protective shell is arranged on the outer layer of the inner heat insulation layer, an installation support is installed in an inner cavity of the inner heat insulation layer, a hydraulic cylinder is installed on the installation support, and a laser distance measuring instrument is installed at the output end of the hydraulic cylinder. The measuring device has the beneficial effects that the measuring device can quickly and accurately measure the distance between the oxygen lance nozzle and the molten steel level in the converter during smelting, is simpler in structure, is safe and practical, is more convenient to use, is high in reliability, does not need field operation of workers, and is convenient to popularize and use. Therefore, the labor intensity of workers and the operation danger coefficient are reduced.

Description

Technical Field

[0001] The utility model relates to the field of steel smelting equipment, in particular to a device for measuring the distance between a converter oxygen lance nozzle and a steel liquid surface in the furnace. Background Art

[0002] In converter smelting production, the oxygen lance is a key process equipment of the converter. The control of the distance between the oxygen lance nozzle and the steel liquid level in the furnace is crucial for converter steelmaking, which directly affects slag removal, dephosphorization, decarburization, heating, converter smelting safety and the service life of the oxygen lance. With the increase in the number of steelmaking furnaces, the furnace bottom and lining are eroded and the shape is irregular after the furnace is repaired. The distance from the oxygen lance nozzle to the steel liquid level at the lowest lance position can no longer be calculated theoretically, and it is necessary to measure it every certain number of furnaces. The traditional measurement method generally adopts manual measurement, which requires the measurement personnel to climb to the nitrogen sealing platform of the converter, install a steel rod in the oxygen lance spray space or on the oxygen lance body, and then lower the oxygen lance to the lowest lance position, so that the steel rod enters part of the metal liquid, and then lift the oxygen lance to measure the distance from the oxygen lance nozzle to the steel liquid level at the lowest lance position through the molten mark of the high-temperature melt on the steel rod. This measurement method has a harsh working environment, high labor intensity and high risk factor.

[0003] Chinese patent CN 109136459 A discloses a device and method for measuring the depth and relative position of the liquid level of a converter molten pool. The patent requires that a measuring rod be fixed to the oxygen gun by bolts. The measuring rod has three legs, and a tension sensor and a displacement encoder are provided on the oxygen gun, and a protective cover is installed outside the tension sensor and the displacement encoder. This measurement method still requires manual installation of the measuring device on the oxygen gun, which results in a harsh operating environment, high labor intensity, and high risk factor.

[0004] Chinese patent CN 216585060 U discloses a device for measuring the distance between the oxygen lance nozzle and the molten steel level of a converter, including an auxiliary lance instrument, an auxiliary lance height encoder, an oxygen lance height encoder, an auxiliary lance PLC, an oxygen lance PLC, an operation room and a central control room. The auxiliary lance system is used to replace the traditional manual measurement method, thereby improving the measurement accuracy, improving the safety during measurement, and reducing the risk factor of the operation. However, the measuring device must rely on the auxiliary lance system, and cannot be applied to converters using bomb-type auxiliary lances and converters without auxiliary lances. Utility Model Content

[0005] The purpose of the utility model is to provide a device for measuring the distance between the oxygen lance nozzle of a converter and the steel liquid level in the furnace in view of the shortcomings and defects in the prior art. The measuring device can quickly and accurately measure the distance between the oxygen lance nozzle and the steel liquid level in the furnace during converter smelting, and the structure of the measuring device is simpler, safer and more practical. It is not only more convenient to use and has high reliability, but also does not require workers to work on site, thereby reducing the labor intensity of workers and the risk factor of operation.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a device for measuring the distance between a converter oxygen lance nozzle and the steel liquid level in the furnace, which comprises a converter body 5, an oxygen lance nitrogen seal 4 is installed on the converter body 5, and a nitrogen seal platform 3 is provided on the outer side of the oxygen lance nitrogen seal 4, characterized in that: a distance measuring device 2 is installed on the nitrogen seal platform 3, the distance measuring device 2 is located at the opening of the oxygen lance nitrogen seal 4, and a converter oxygen lance nozzle 1 is provided directly above the oxygen lance nitrogen seal 4; the distance measuring device 2 comprises an inner insulation layer 23, the outer layer of the inner insulation layer 23 is provided with an outer protective shell 24, the inner cavity of the inner insulation layer 23 is provided with a mounting bracket 21, a hydraulic cylinder 22 is installed on the mounting bracket 21, and a laser rangefinder 25 is installed at the output end of the hydraulic cylinder 22.

[0007] Furthermore, the outer protective shell 24 is a steel shell.

[0008] Furthermore, the inner insulation layer 23 is a ceramic insulation material.

[0009] Furthermore, a circular opening is provided on one side of the inner insulation layer 23 and the outer protective shell 24 close to the converter oxygen lance nozzle 1 .

[0010] Furthermore, the control system of the hydraulic cylinder 22 is interlocked with the displacement encoder of the converter oxygen lance nozzle 1 .

[0011] After adopting the above technical scheme, the beneficial effects of the utility model are as follows: the measuring device can quickly and accurately measure the distance between the oxygen lance nozzle and the steel liquid level in the converter during converter smelting, and the structure of the measuring device is simpler, safer and more practical. It is not only more convenient to use and has high reliability, but also does not require workers to work on site, thereby reducing the labor intensity of workers and the risk factor of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a structural schematic diagram of the distance measuring device in the utility model.

[0015] Figure 3 It is a schematic diagram of the oxygen lance nozzle of the converter of the utility model being in the highest position.

[0016] Figure 4The utility model is a schematic diagram of the working state of the oxygen lance nozzle of the converter.

[0017] Explanation of the reference numerals: converter oxygen lance nozzle 1, distance measuring device 2, nitrogen sealing port platform 3, oxygen lance nitrogen sealing port 4, converter furnace body 5, mounting bracket 21, hydraulic cylinder 22, inner insulation layer 23, outer protective shell 24, laser rangefinder 25. DETAILED DESCRIPTION

[0018] See also Figure 1-Figure 2 As shown, the technical solution adopted in this specific embodiment is: it includes a converter body 5, an oxygen gun nitrogen seal 4 is installed on the converter body 5, and a nitrogen seal platform 3 is provided on the outer side of the oxygen gun nitrogen seal 4, and it is characterized in that: a distance measuring device 2 is installed on the nitrogen seal platform 3, the distance measuring device 2 is located at the opening of the oxygen gun nitrogen seal 4, and a converter oxygen gun nozzle 1 is provided directly above the oxygen gun nitrogen seal 4; the distance measuring device 2 includes an inner insulation layer 23, the outer layer of the inner insulation layer 23 is provided with an outer protective shell 24, the inner cavity of the inner insulation layer 23 is installed with a mounting bracket 21, a hydraulic cylinder 22 is installed on the mounting bracket 21, and a laser rangefinder 25 is installed at the output end of the hydraulic cylinder 22.

[0019] Furthermore, the outer protective shell 24 is a steel shell, which can prevent the device from being damaged by collision with foreign objects.

[0020] Furthermore, the inner heat insulating layer 23 is a ceramic heat insulating material. The inner heat insulating layer 23 has a certain heat insulating capacity, thereby preventing the equipment from being burned by high temperature.

[0021] Furthermore, a circular opening is provided on the inner insulation layer 23 and the outer protective shell 24 near the converter oxygen lance nozzle 1, so that the laser rangefinder 25 can enter and exit the inner insulation layer 23 and the outer protective shell 24 under the drive of the hydraulic cylinder 22.

[0022] Furthermore, the control system of the hydraulic cylinder 22 is interlocked with the displacement encoder of the converter oxygen lance nozzle 1. Only when the converter oxygen lance nozzle 1 is lifted to the highest position, the hydraulic cylinder 22 will drive the laser rangefinder 25 to enter the working position, and the working position of the laser rangefinder 25 is located between the converter oxygen lance nozzle 1 and the oxygen lance nitrogen sealing port 4.

[0023] The working principle of the utility model is as follows: after the slag splashing furnace protection, all the remaining slag is poured out, the pure scrap steel prepared in advance is added, and then the molten iron is added. The molten iron can ensure that the scrap steel does not float on the steel liquid surface, affecting the measurement accuracy. During the measurement, the laser rangefinder 25 is driven by the hydraulic cylinder 22 to move to the middle of the converter oxygen lance nozzle 1 and the oxygen lance nitrogen seal 4. The distance from the laser rangefinder 25 to the steel liquid surface in the converter furnace body 5 is H1, and the data is collected to the computer through the PLC. After the data is collected, the laser rangefinder 25 is retracted to the inner insulation layer 23 and the outer protective shell 24. The distance H2 from the laser rangefinder 25 to the highest position of the oxygen lance is a fixed value that can be collected in advance to the computer. Subsequently, the staff can start to operate the converter oxygen lance nozzle 1 to descend, and the displacement distance of the converter oxygen lance nozzle 1 is H3, which is collected to the computer through the oxygen lance displacement encoder. The computer automatically calculates that during converter smelting, the distance H4 from the converter oxygen lance nozzle 1 to the molten steel level in the converter furnace body 5 is H4, H4=H1-H3+H2, wherein the oxygen lance position during converter smelting can be adjusted according to the value of H4.

[0024] The above description is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A device for measuring the distance between a converter oxygen lance nozzle and a steel liquid level in the furnace, comprising a converter furnace body (5), an oxygen lance nitrogen seal (4) being mounted on the converter furnace body (5), and a nitrogen seal platform (3) being arranged outside the oxygen lance nitrogen seal (4), characterized in that: A distance measuring device (2) is installed on the nitrogen sealing port platform (3), the distance measuring device (2) is located at the opening of the oxygen lance nitrogen sealing port (4), and a converter oxygen lance nozzle (1) is provided directly above the oxygen lance nitrogen sealing port (4); The distance measuring device (2) comprises an inner heat insulating layer (23), the outer layer of the inner heat insulating layer (23) is provided with an outer protective shell (24), the inner cavity of the inner heat insulating layer (23) is equipped with a mounting bracket (21), a hydraulic cylinder (22) is mounted on the mounting bracket (21), and a laser distance measuring device (25) is mounted at the output end of the hydraulic cylinder (22).

2. The device for measuring the distance between the oxygen lance nozzle of a converter and the steel liquid level in the furnace according to claim 1, characterized in that: The outer protective shell (24) is a steel shell.

3. The device for measuring the distance between the oxygen lance nozzle of a converter and the steel liquid level in the furnace according to claim 1, characterized in that: The inner heat insulating layer (23) is a ceramic heat insulating material.

4. The device for measuring the distance between the oxygen lance nozzle of a converter and the steel liquid level in the furnace according to claim 1, characterized in that: The inner insulation layer (23) and the outer protective shell (24) are provided with a circular opening on one side close to the converter oxygen lance nozzle (1).

5. The device for measuring the distance between the oxygen lance nozzle of a converter and the steel liquid level in the furnace according to claim 1, characterized in that: The control system of the hydraulic cylinder (22) is interlocked with the displacement encoder of the converter oxygen lance nozzle (1).

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