All-water and aerial fog cooling switching system for billet continuous casting machine

Abstract

The utility model discloses an all-water and aerial fog cooling switching system for a billet continuous casting machine, which is used on the billet continuous casting machine and comprises an all-water cooling unit, an aerial fog cooling unit, an injection pipeline and switching mechanisms, and the switching mechanisms are arranged on an all-water pipeline and an aerial fog pipeline. The switching mechanism can cut off the pipeline corresponding to the switching mechanism; the device is simple in structure and convenient to operate, and the process of rapidly switching all-water cooling and aerial fog cooling of the continuous casting machine is achieved; the high-pulling-speed production of the casting machine is met under the full water cooling unit; the aerial fog cooling unit and the full water cooling unit can be adjusted and matched with each other, and the cooling requirement of variety steel is met.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling system switching, in particular to a full water and gas mist cooling switching system for a square billet continuous casting machine. Background Art

[0002] In the production process of the continuous casting machine, the liquid steel first cools and solidifies in the crystallizer to form a billet shell. After the billet with the liquid core is pulled out of the crystallizer, it needs to be directly cooled by spraying water or jetting water to make the billet solidify quickly and enter the straightening area. The role of secondary cooling is to force and evenly cool the surface of the billet so that the billet solidifies in a short time. The secondary cooling process directly affects the high operating rate of the continuous casting machine, the billet quality and the risk of steel leakage during the pouring process.

[0003] At present, the secondary cooling methods of continuous casting machines mainly include full water cooling (water spray cooling) and gas mist cooling (gas-water spray cooling). Water spray cooling uses the jet effect of the spray hole to atomize the water. The atomized particle size is large and the cooling intensity is high, which is suitable for the production of large specific water billets. Gas mist cooling uses high-pressure air and water to enter the nozzle from different directions, and uses the energy of high-pressure air to atomize the water to form extremely small particle sizes. The water utilization rate is high and the cooling is more uniform. When producing special steels, the full water cooling process has a high cooling intensity, uneven corner cooling, and is prone to corner cracks and internal quality problems. When producing ordinary steel, the gas mist cooling process has a low cooling intensity and the specific water volume cannot meet the production requirements of high drawing speeds. However, the cooling system of the continuous casting machine in the prior art can only provide a single water spray cooling or gas mist cooling, which cannot meet the needs of billets of different materials.

[0004] In order to solve the above problems, a full water and gas mist cooling switching system for a square billet continuous casting machine is proposed. Summary of the invention

[0005] The utility model aims to solve the above problems and provides a full water and gas mist cooling switching system for a square billet continuous casting machine.

[0006] The specific scheme of the utility model is: a full water and gas mist cooling switching system for a square billet continuous casting machine, the system is used on the square billet continuous casting machine, including:

[0007] The full water cooling unit comprises: a full water pipeline, wherein the full water pipeline is used to provide cooling water cooling medium;

[0008] The aerosol cooling unit comprises: a compressed air pipeline and a water inlet pipeline, wherein the compressed air pipeline and the water inlet pipeline are connected at the front end to form an aerosol pipeline, and the aerosol pipeline is used to provide an atomized water cooling medium;

[0009] A spray pipeline, the full water pipeline and the gas mist pipeline are both connected to the spray pipeline, and the spray pipeline is used to spray the cooling medium provided by the full water pipeline and / or the gas mist pipeline on the cast billet in the billet continuous casting machine for cooling;

[0010] A switching mechanism is provided on both the full water pipeline and the aerosol pipeline, and the switching mechanism can cut off the corresponding pipeline.

[0011] Furthermore, the switching mechanism includes: a cut-off valve, which is used to cut off the corresponding pipeline; a regulating valve is provided on one side of the cut-off valve, which is used to regulate the flow of the corresponding pipeline; an electromagnetic flowmeter is provided on one side of the regulating valve, which is used to display the flow rate.

[0012] Furthermore, the full water pipeline includes: five full water branches, each of which is provided with a switching mechanism; the aerosol pipeline includes: five aerosol branches, each of which is provided with a switching mechanism.

[0013] The utility model has the following beneficial effects:

[0014] 1. Realize the rapid switching process between full water cooling and gas mist cooling of continuous casting machine;

[0015] 2. The full water cooling unit can meet the high casting speed (≥4.0m / min) production of the casting machine;

[0016] 3. The mist cooling unit can be adjusted and coordinated with the full water cooling unit to meet the cooling needs of different types of steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structural principle of the utility model;

[0018] In the figure: 1. full water pipeline; 101, full water branch; 2. compressed air pipeline; 3. water inlet pipeline; 4. aerosol pipeline; 401, aerosol branch; 5. injection pipeline; 6. shut-off valve; 7. regulating valve; 8. electromagnetic flowmeter. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0022] Please refer to Figure 1 , a full water and gas mist cooling switching system for a billet continuous casting machine, the system is used on a billet continuous casting machine, comprising:

[0023] The full water cooling unit comprises: a full water pipeline 1, wherein the full water pipeline 1 is used to provide cooling water cooling medium;

[0024] The aerosol cooling unit comprises: a compressed air pipeline 2 and a water inlet pipeline 3, wherein the compressed air pipeline 2 and the water inlet pipeline 3 are connected at the front end to form an aerosol pipeline 4, and the aerosol pipeline 4 is used to provide an atomized water cooling medium;

[0025] The spray pipeline 5, the full water pipeline 1 and the gas mist pipeline 4 are both connected to the spray pipeline 5, and the spray pipeline 5 is used to spray the cooling medium provided by the full water pipeline 1 and / or the gas mist pipeline 4 on the cast billet in the billet continuous casting machine for cooling;

[0026] Switching mechanism: both the full water pipeline 1 and the aerosol pipeline 4 are provided with a switching mechanism, and the switching mechanism can cut off the corresponding pipeline.

[0027] In this embodiment, the switching mechanism includes: a cut-off valve 6, which is used to cut off the corresponding pipeline; a regulating valve 7 is provided on one side of the cut-off valve 6, and the regulating valve 7 is used to adjust the flow of the corresponding pipeline; an electromagnetic flowmeter 8 is provided on one side of the regulating valve 7, and the electromagnetic flowmeter 8 is used to display the flow size.

[0028] In this embodiment, the full water pipeline 1 includes five full water branches 101 , each of which is provided with a switching mechanism; the aerosol pipeline 4 includes five aerosol branches 401 , each of which is provided with a switching mechanism.

[0029] Embodiments of the present invention:

[0030] (1) Lay the water inlet pipeline 3 and merge it into the secondary cooling water compressed air pipeline 2 of the casting machine to form the aerosol pipeline 4, and add a shut-off valve 6 to the merged aerosol pipeline 4 to realize the switching function between compressed air and cooling water.

[0031] (2) Add a regulating valve 7 and a flow meter to the aerosol branch 401 of zones 1-5.

[0032] (3) Design control logic. When the casting machine produces grade steel, the regulating valve 7 of the mist branch 401 of zones 1-5 is automatically fully opened to achieve mist cooling.

[0033] (4) Design control logic. When the casting machine produces ordinary steel, the original full-water pipeline 1 is automatically switched to cooling water. The branch regulating valves 7 in zones 1-5 are automatically adjusted according to the set cooling water flow rate. The cut-off valve 6 is used to close the aerosol pipeline 4. The aerosol cooling nozzles in zones 1-5 are replaced with full-water cooling nozzles to achieve full water cooling.

[0034] (5) In the full water cooling mode, the original compressed air pipeline 2 is switched to cooling water as make-up water.

[0035] The utility model has the following beneficial effects:

[0036] 1. Realize the rapid switching process between full water cooling and gas mist cooling of continuous casting machine;

[0037] 2. The full water cooling unit can meet the high casting speed (≥4.0m / min) production of the casting machine;

[0038] 3. The mist cooling unit can be adjusted and coordinated with the full water cooling unit to meet the cooling needs of different types of steel.

Claims

1. A full water and gas mist cooling switching system for a billet continuous casting machine. The system is used on a billet continuous casting machine and is characterized in that : include: The full water cooling unit comprises: a full water pipeline, wherein the full water pipeline is used to provide cooling water cooling medium; The aerosol cooling unit comprises: a compressed air pipeline and a water inlet pipeline, wherein the compressed air pipeline and the water inlet pipeline are connected at the front end to form an aerosol pipeline, and the aerosol pipeline is used to provide an atomized water cooling medium; A spray pipeline, the full water pipeline and the gas mist pipeline are both connected to the spray pipeline, and the spray pipeline is used to spray the cooling medium provided by the full water pipeline and / or the gas mist pipeline on the cast billet in the billet continuous casting machine for cooling; A switching mechanism is provided on both the full water pipeline and the aerosol pipeline, and the switching mechanism can cut off the corresponding pipeline.

2. The full water and gas mist cooling switching system for a billet continuous casting machine according to claim 1, characterized in that: The switching mechanism includes: a cut-off valve, which is used to cut off the corresponding pipeline; a regulating valve is provided on one side of the cut-off valve, which is used to regulate the flow of the corresponding pipeline; an electromagnetic flowmeter is provided on one side of the regulating valve, which is used to display the flow rate.

3. The full water and gas mist cooling switching system for a billet continuous casting machine according to claim 1 is characterized in that: The full water pipeline includes five full water branches, each of which is provided with a switching mechanism; the aerosol pipeline includes five aerosol branches, each of which is provided with a switching mechanism.

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