An air-water nozzle for a square and round billet continuous casting machine

Abstract

The present application provides an air-water nozzle for a continuous casting machine for square and round billets, comprising a pair of spray pipes and a nozzle connected to the top thereof, an outer grille being provided in the spray pipe; the nozzle head comprising a connecting portion, a nozzle body and a nozzle head, the connecting portion being provided at the top of the spray pipe, the nozzle body being provided at the top of the connecting portion, the nozzle head being connected to the middle of the nozzle body and extending out of the surface of the nozzle body; a mixing chamber being provided in the nozzle head, a filter chamber being provided in the nozzle body, the filter chamber being connected to the mixing chamber, and the filter chamber being connected to the spray pipe; an inner grille being provided in the filter chamber; an external thread being provided on the connecting portion, a connecting cover being provided above the nozzle body and being threadedly connected to the connecting portion, and the top inner surface of the connecting cover being in contact with the upper surface of the nozzle body. The beneficial effects of the present application are as follows: a multi-stage filtering structure being provided in the nozzle can effectively filter the medium flowing through the nozzle, thereby reducing the blockage rate of the nozzle; and the detachable connection between the connecting cover and the connecting portion facilitates the replacement of the nozzle head, thereby improving production efficiency.

Description

Technical Field

[0001] The present disclosure relates to the technical field of nozzles for steel metallurgical continuous casting machines, and in particular to an air-water nozzle for square and round billet continuous casting machines. Background Art

[0002] During the continuous casting process in steel metallurgy, the secondary cooling of the continuous casting machine requires precise cooling of the hot, yet-to-solidify billets to ensure billet quality and yield. As a core component of secondary cooling, the nozzle's performance, ease of installation and replacement, and integrity of its online operation play a key role in secondary cooling, directly impacting billet quality and yield.

[0003] During the continuous casting process, the secondary cooling water is atomized efficiently in the nozzle cavity under the action of the water supply system pressure and the shearing of compressed air. The atomized liquid medium passes through the nozzle head with appropriate particles, flow rate and angle to efficiently and evenly cool the high-temperature continuous casting billet in the secondary cooling section of the continuous casting machine, ultimately achieving the goal of complete solidification of the continuous casting billet without defects.

[0004] At present, most nozzles used in metallurgical continuous casting machines are simple dual-medium internal mixing nozzles. The main problem is that the nozzles are easily clogged during operation, sometimes with a clogging rate of more than 60%. The installation, removal and replacement of the nozzles are very inconvenient, which will affect the operating rate of the continuous casting machine by more than 3%, resulting in a decrease in production. The compressed air consumption of this type of nozzle is extremely high, with an unprecedented consumption of 45m3 / ton of steel. 3 The cost per ton of steel is as high as RMB 4 or more. The simple air-water atomizing nozzles currently used in China have a significant impact on the quality, output, operating rate, and media consumption of continuous casting machines. For example, in a steel mill with an annual output of 2 million tons of continuous casting billets, problems such as online nozzle blockage, poor performance, frequent replacement, prolonged casting machine downtime, and excessive compressed air consumption will lead to reduced output, low operating rate, and a decrease in the qualified rate of casting billets. This will result in a loss of nearly RMB 10 million in revenue each year. Moreover, this type of simple air-water nozzle has been used in China for 30 years without any technological advancement or update, which has, to a certain extent, restricted the development and technological progress of continuous casting machines. Summary of the Invention

[0005] The purpose of this application is to provide an air-water nozzle for a square and round billet continuous casting machine in order to solve the above problems.

[0006] In a first aspect, the present application provides an air-water nozzle for a square and round billet continuous casting machine, comprising a pair of spray pipes and a nozzle connected to the top ends of the pair of spray pipes, a connecting portion being connected between the pair of spray pipes and the nozzle head, and an outer grille being respectively provided in the pair of spray pipes; the nozzle head comprises a nozzle body and a nozzle head, the connecting portion being provided at the top ends of the pair of spray pipes, the nozzle body being provided at the top ends of the connecting portion, the nozzle head being connected to the middle portion of the nozzle body and extending out of the surface of the nozzle body; a mixing chamber being provided in the nozzle head, filter chambers being respectively provided on both sides of the nozzle body corresponding to the mixing chamber, the filter chambers being communicated with the mixing chamber, a pair of the filter chambers being respectively provided corresponding to the pair of spray pipes, the filter chambers being communicated with the corresponding spray pipes; an inner grille being respectively provided in the pair of the filter chambers; an external thread being provided on the surface of the connecting portion, a connecting cover being provided above the nozzle body and being threadedly connected to the external thread of the connecting portion, the inner surface of the top of the connecting cover being in contact with the upper surface of the nozzle body; a first through hole being provided in the middle portion of the connecting cover, the top end of the nozzle head extending out to the top of the connecting cover through the first through hole.

[0007] According to the technical solution provided in the embodiment of the present application, an airflow accelerator, a plugging piece and a nozzle core are arranged in sequence in the mixing chamber. The airflow accelerator is arranged on the side close to the connecting part, and an airflow accelerator core is provided in the airflow accelerator. The medium in the mixing chamber passes through the airflow accelerator, the plugging piece and the nozzle core in sequence and then is sprayed out of the nozzle head.

[0008] According to the technical solution provided in the embodiment of the present application, a sealing gasket is provided between the connection cover and the nozzle body.

[0009] According to the technical solution provided in the embodiment of the present application, a plurality of positioning pins are provided at the top of the connecting portion, and positioning holes are provided at the bottom end of the nozzle body corresponding to each of the positioning pins, and the nozzle body is plugged into the top of the connecting portion through the positioning pins.

[0010] According to the technical solution provided in the embodiment of the present application, the spray pipe includes a spray main pipe and a spray branch pipe connected to the spray main pipe, and the outer grille is arranged in the spray branch pipe; the inner diameter of the spray main pipe is larger than the inner diameter of the spray branch pipe.

[0011] According to the technical solution provided in the embodiment of the present application, the connecting portion is welded to the top end of a pair of the spray branch pipes.

[0012] According to the technical solution provided in the embodiment of the present application, the nozzle head is threadedly connected to the middle part of the nozzle body.

[0013] Beneficial effects of the present invention: The present application provides an air-water nozzle for a square and round billet continuous casting machine. A multi-stage filtering structure is arranged in the nozzle, which can effectively reduce the online blockage rate of the nozzle. The online blockage rate is reduced by about 70%, and the replacement frequency of the nozzle is reduced; the nozzle is arranged to be a structure that is detachably connected to the spray pipe, which is convenient for the replacement, installation, and maintenance of the nozzle, and realizes rapid installation of the nozzle. The time for replacing and installing the nozzle is shortened to about 10% of the original, reducing the downtime of the equipment and improving production efficiency; through the optimized design of the nozzle, the compressed air consumption of the nozzle is reduced by more than 20%, solving the problem of large compressed air consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the first embodiment of the present application;

[0015] Figure 2 This is a schematic diagram of the gas and water flow in the first embodiment of the present application;

[0016] The text markings in the figure indicate: 1. Spray main pipe; 2. Spray branch pipe; 3. Outer grille; 4. Connecting part; 5. Sealing gasket; 6. Nozzle body; 7. Filter chamber; 8. Inner grille; 9. Connecting cover; 10. Nozzle head; 11. Nozzle core; 12. Blocking piece; 13. Airflow acceleration core; 14. Airflow acceleration body; 15. Mixing chamber. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present application is described in detail below with reference to the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present application.

[0018] like Figure 1 and Figure 2 Shown is a schematic diagram of the first embodiment of the present application, including a pair of spray pipes and a nozzle connected to the top end of the pair of spray pipes, a connecting part 4 is connected between the pair of spray pipes and the nozzle, and an outer grille 3 is respectively arranged in the pair of spray pipes; the nozzle includes a nozzle body 6 and a nozzle head 10.

[0019] The connecting portion 4 is provided at the top end of a pair of the spray pipes. Preferably, the connecting portion 4 is welded to the top end of a pair of the spray branch pipes 2 .

[0020] The nozzle body 6 is disposed at the top of the connecting portion 4. The nozzle head 10 is connected to the middle of the nozzle body 6 and extends out of the surface of the nozzle body 6. Preferably, the nozzle head 10 is threadedly connected to the middle of the nozzle body 6. A mixing chamber 15 is provided in the nozzle head 10. Filter chambers 7 are provided on both sides of the nozzle body 6 corresponding to the mixing chamber 15. The filter chambers 7 are connected to the mixing chamber 15. A pair of the filter chambers 7 are respectively provided corresponding to a pair of the spray pipes, and the filter chambers 7 are connected to the corresponding spray pipes. An inner grille 8 is provided in each of the pair of filter chambers 7.

[0021] The surface of the connecting part 4 is provided with an external thread, and the connecting cover 9 provided above the nozzle body 6 is threadedly connected to the external thread of the connecting part 4, and the top inner surface of the connecting cover 9 is in contact with the upper surface of the nozzle body 6; a first through hole is provided in the middle of the connecting cover 9, and the top end of the nozzle head 10 extends to the top of the connecting cover 9 through the first through hole.

[0022] In this embodiment, an outer grille 3 is provided in the spray pipe, and an inner grille 8 is provided in the nozzle body 6, so that the medium flowing through the nozzle undergoes two-stage filtration, thereby effectively reducing the online clogging rate of the nozzle, making it about 70% lower than the online clogging rate of the nozzle in the prior art.

[0023] In this embodiment, since the connecting cover 9 is threadedly connected to the connecting part 4, the connecting part 4 is fixedly connected to the spray pipe, and when the connecting cover 9 is connected to the connecting part 4, the nozzle body 6 is pressed against the inner side of the connecting cover 9, thereby realizing a detachable connection between the nozzle body 6 and the connecting part 4. Since the nozzle is mainly damaged or replaced during use, the nozzle is set to a detachable structure to facilitate the replacement, installation and maintenance of the nozzle. The replacement time of the nozzle is shortened to about 10% of the original time, effectively reducing the downtime of the equipment, thereby improving the production efficiency of the equipment.

[0024] In a preferred embodiment, an airflow accelerator 14, a blocking piece 12, and a nozzle core 11 are sequentially disposed within the mixing chamber 15. The airflow accelerator 14 is positioned on a side adjacent to the connecting portion 4, and an airflow accelerator core 13 is disposed within the airflow accelerator 14. The medium within the mixing chamber 15 sequentially passes through the airflow accelerator 14, the blocking piece 12, and the nozzle core 11 before exiting the nozzle head 10. In this preferred embodiment, the optimized design of the nozzle achieves efficient multi-stage atomization, enabling efficient atomization at lower medium pressure and flow rates, and reducing the nozzle's compressed air consumption by approximately 20%.

[0025] In a preferred embodiment, a sealing gasket 5 is provided between the connecting cover 9 and the nozzle body 6. In this preferred embodiment, the sealing gasket 5 is provided between the connecting cover 9 and the side of the nozzle body 6 to ensure the sealing of the nozzle, so that the nozzle has a high-temperature resistant sealing function, thereby improving the service life of the nozzle.

[0026] In a preferred embodiment, the top of the connecting portion 4 is provided with a plurality of locating pins, and the bottom end of the nozzle body 6 is provided with locating holes corresponding to the locating pins. The nozzle body 6 is plugged into the top of the connecting portion 4 via the locating pins. In this preferred embodiment, the nozzle body 6 is plugged into the connecting portion 4 through the positioning between the locating holes and the locating pins. The nozzle body 6 is then connected to the spray pipe by crimping the connecting cover 9 above the nozzle body 6.

[0027] In a preferred embodiment, the spray pipe includes a main spray pipe 1 and a branch spray pipe 2 connected to the main spray pipe 1 , and the outer grille 3 is arranged in the branch spray pipe 2 ; the inner diameter of the main spray pipe 1 is larger than the inner diameter of the branch spray pipe 2 .

[0028] The working process of the nozzle in this embodiment is as follows:

[0029] Airflow and cooling water from on-site compressed gas equipment flow through on-site equipment piping into the spray main 1. After entering the spray main 1, the airflow and cooling water flow into the connected spray branch 2. Inside the spray branch 2, the airflow and cooling water are filtered by the outer grille 3 before entering the filter chamber 7 for further filtration through the inner grille 8. The filtered airflow and cooling water flow enter the mixing chamber 15 within the nozzle body 6 for swirling mixing. This structure filters the air and water paths twice, significantly reducing nozzle blockage. The unique internal design reduces nozzle gas consumption by approximately 20% compared to conventional nozzles. The nozzles are connected using a threaded, compression-fast connection to the connection cap 9, ensuring quick and easy on-site nozzle maintenance and replacement. The gas-water mixture is accelerated by the airflow accelerator 14 in the nozzle head 10 and then compressed again by the plugging piece 12. A second atomization and mixing is performed at the spatial position of the plugging piece 12 and the nozzle core 11. The flow is diverted by the angled circular hole of the nozzle core 11 to form a highly atomized gas-water mixture with controllable angle, thereby achieving a higher atomization state and forming a more uniform distribution of atomized particles.

[0030] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of this application, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the application to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. An air-water nozzle for a square and round billet continuous casting machine, characterized in that: It includes a pair of spray pipes and a nozzle connected to the top of the pair of spray pipes, a connecting portion is connected between the pair of spray pipes and the nozzle, and an outer grille is respectively provided in the pair of spray pipes; The nozzle includes a nozzle body and a nozzle head, the connecting portion is provided at the top end of a pair of the spray pipes, the nozzle body is provided at the top end of the connecting portion, and the nozzle head is connected to the middle of the nozzle body and extends out of the surface of the nozzle body; A mixing chamber is provided in the nozzle head, and filter chambers are provided on both sides of the nozzle body corresponding to the mixing chamber, the filter chambers are communicated with the mixing chamber, a pair of the filter chambers are respectively provided corresponding to a pair of the spray pipes, and the filter chambers are communicated with the corresponding spray pipes; an inner grille is provided in each of the pair of filter chambers; The surface of the connecting portion is provided with an external thread, and the connecting cover provided above the nozzle body is threadedly connected to the external thread of the connecting portion, and the top inner surface of the connecting cover is in contact with the upper surface of the nozzle body; a first through hole is provided in the middle of the connecting cover, and the top end of the nozzle head extends to the top of the connecting cover through the first through hole; An airflow accelerator, a plugging piece and a nozzle core are sequentially arranged in the mixing chamber. The airflow accelerator is arranged on a side close to the connecting part. The airflow accelerator is provided with an airflow accelerator core. The medium in the mixing chamber passes through the airflow accelerator, the plugging piece and the nozzle core in sequence and then is ejected out of the nozzle head.

2. The air-water nozzle for a square and round billet continuous casting machine according to claim 1, characterized in that: A sealing gasket is provided between the connecting cover and the nozzle body.

3. The air-water nozzle for a square and round billet continuous casting machine according to claim 1, characterized in that: The top of the connecting portion is provided with a plurality of positioning pins, and the bottom end of the nozzle body is provided with positioning holes corresponding to the positioning pins, and the nozzle body is plugged into the top of the connecting portion through the positioning pins.

4. The air-water nozzle for a square and round billet continuous casting machine according to claim 1, characterized in that: The spray pipe includes a spray main pipe and a spray branch pipe connected to the spray main pipe, and the outer grille is arranged in the spray branch pipe; the inner diameter of the spray main pipe is larger than the inner diameter of the spray branch pipe.

5. The air-water nozzle for a square and round billet continuous casting machine according to claim 4, characterized in that: The connecting portion is welded to the top ends of a pair of the spray branch pipes.

6. The air-water nozzle for a square and round billet continuous casting machine according to claim 1, characterized in that: The nozzle head is threadedly connected to the middle part of the nozzle body.

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