Secondary cooling control system and control method for multi-casting-flow and multi-section billet continuous casting machine

Abstract

The invention discloses a secondary cooling control system and method for a multi-casting-flow and multi-section billet continuous casting machine. The secondary cooling control system comprises a secondary cooling water adjusting device and a secondary cooling air adjusting device, can control a continuous casting machine to produce small square billets through full water cooling and large square billets through aerial fog cooling, can compatibly produce the large square billets through aerial fog cooling and produce the small square billets through full water cooling, and can independently control the cooling mode of each casting flow; therefore, any requirements of multi-casting-flow and large-section and small-section casting blank cooling modes are met, a casting machine cooling system is simplified, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of continuous casting in iron and steel metallurgy, and in particular relates to a secondary cooling control system and a control method for a multi-strand multi-section square billet continuous casting machine. Background Art

[0002] In the current continuous casting production practice, in order to save construction and operation costs and improve the output and use efficiency of the casting machine, a multi-strand continuous casting machine that can produce multiple billet specifications is often used. For example, a 12-strand continuous casting machine may have several strands with high casting speed to produce small square billets with a cross-section of 150mm×150mm, while the remaining strands may produce large square billets with cross-sections of 320mm×380mm.

[0003] When producing small billets at high casting speed, full water cooling is required, while when producing large billets, mist cooling is required. If two completely independent secondary cooling systems are used when a continuous casting machine produces large and small billets at the same time, the system pipelines and electronic controls are relatively complex, and the floor space is relatively large, and the investment is relatively high. Summary of the invention

[0004] In view of the above-mentioned technical status quo, the present invention provides a secondary cooling control system for a multi-strand and multi-section square billet continuous casting machine, which can be used for producing small square billets by full water cooling and producing large square billets by gas mist cooling, and is compatible with producing large square billets by gas mist cooling and producing small square billets by full water cooling. In addition, the cooling mode of each casting strand can be controlled independently, thereby meeting any requirements of the cooling mode of multiple casting strands and large and small section casting billets, thereby simplifying the cooling system of the casting machine and reducing costs.

[0005] The technical solution provided by the present invention is: a secondary cooling control system for a multi-strand multi-section square billet continuous casting machine, wherein the continuous casting machine is an M-strand continuous casting machine, where M is an integer greater than or equal to 2, and the secondary cooling control system comprises a secondary cooling water regulating device and a secondary cooling air regulating device;

[0006] The secondary cooling water regulating device comprises a main water inlet pipeline, the inlet end of which is provided with a valve, referred to as the main water inlet pipeline valve, for cutting off or opening the secondary cooling water supply; the outlet end of the main water inlet pipeline is connected to M casting water inlet pipelines;

[0007] A valve is provided at the inlet end of each casting stream water inlet pipeline, which is referred to as a casting stream water inlet pipeline valve, and is used to cut off or open the connection with the main water inlet pipeline; each casting stream water inlet pipeline is connected to N water inlet branch pipelines, where N is an integer greater than or equal to 2;

[0008] Each water inlet branch pipeline is provided with a valve, which is referred to as a water inlet branch pipeline valve, and is used to cut off or open the connection with the casting strand water inlet pipeline; the area that can be cooled at the outlet end of the nth water inlet branch pipeline is the secondary cooling zone n, where n is a positive integer and 1≤n≤N;

[0009] The secondary cooling air regulating device comprises a main air intake pipeline, the inlet end of which is provided with a valve, referred to as the main air intake pipeline valve, for cutting off or opening the secondary cooling air supply; the outlet end of the main air intake pipeline is connected to M casting flow air intake pipelines;

[0010] A valve is provided at the inlet end of each casting strand air intake pipeline, which is referred to as a casting strand air intake pipeline valve and is used to cut off or open the connection with the main air intake pipeline; each casting strand air intake pipeline is connected to N air intake branch pipelines;

[0011] Each air intake branch pipeline is provided with a valve, recorded as an air intake branch pipeline valve, which is used to cut off or open the connection with the casting strand air intake pipeline; the outlet end of the nth air intake branch pipeline faces the secondary cooling zone n.

[0012] In the actual square billet casting cooling process, the cooling intensity of the secondary cooling zone 1 is large. Regardless of the size of the cross-section, the secondary cooling zone 1 adopts full water cooling. Therefore, it is preferred not to set an air intake branch pipeline in the secondary cooling zone 1, that is, each casting strand air intake pipeline is connected to N-1 air intake branch pipelines, and the outlet end of the nth air intake branch pipeline faces the secondary cooling zone n+1, 1≤n≤N-1.

[0013] Preferably, the main water inlet pipeline is provided with a pressure detection mechanism for adjusting and detecting the water pressure entering the main water inlet pipeline. Further preferably, the pressure detection mechanism includes an on-site pressure gauge and a pressure signal transmitter. The pressure signal transmitter is preferably capable of remote monitoring.

[0014] Preferably, the strand water inlet pipeline is provided with a pressure detection mechanism for detecting the water pressure entering the strand water inlet pipeline. The pressure detection mechanism includes an on-site pressure gauge.

[0015] Preferably, the water inlet branch pipeline is provided with a flow meter for detecting the water flow rate of the self-casting flow water inlet pipeline flowing into the water inlet branch pipeline, and further preferably, a regulating valve for adjusting the water flow rate of the self-casting flow water inlet pipeline flowing into the water inlet branch pipeline is provided. Preferably, the water inlet branch pipeline is also provided with a pressure detection mechanism for detecting the water pressure at the outlet end of the water inlet branch pipeline, and further preferably, the pressure detection mechanism includes an on-site pressure gauge.

[0016] Preferably, the main air intake pipeline is provided with a pressure detection mechanism for adjusting and detecting the air pressure entering the main air intake pipeline. Further preferably, the pressure detection mechanism includes an on-site pressure gauge and a pressure signal transmitter. The pressure signal transmitter can preferably be remotely monitored.

[0017] Preferably, the strand air inlet pipeline is provided with a pressure detection mechanism for detecting the air pressure entering the strand air inlet pipeline, and more preferably, a pressure regulating valve is also provided for regulating the air pressure of the strand air inlet pipeline. The pressure detection mechanism includes a pressure signal transmitter.

[0018] Preferably, 2≤N≤10, more preferably 2≤N≤6, for example, 2, 3, 4, 5, 6, etc.

[0019] Preferably, the air intake branch pipeline is provided with a pressure detection mechanism for detecting the air pressure at the outlet end of the air intake branch pipeline. The pressure detection mechanism includes an on-site pressure gauge. Further preferably, the air intake branch pipeline is provided with a check valve.

[0020] Since each casting strand can be used for high-speed billet production or billet production, and the requirements for water pressure, air pressure, etc. during secondary cooling are different, preferably, the water inlet branch pipeline is set, when used for high-speed full-water cooling to produce billets, the cooling water volume required is much larger than that of aerosol billets, and general regulating valves cannot meet the ultra-high water volume regulation range, so it is preferred that the regulating valve of the water inlet branch pipeline is connected in parallel with a bypass pipeline with a valve, and when producing high-speed billets, this bypass pipeline is opened for auxiliary regulation, so that the full-water cooling water volume of the high-speed billet can be achieved. In particular, the auxiliary regulation is performed in the early stage of the billet cooling process, that is, along the billet moving direction, preferably, the regulating valve of the water inlet branch pipeline corresponding to the secondary cooling area first passed is connected in parallel with a bypass pipeline with a valve. For example, the billet cooling zone passes through the secondary cooling zone 1, the secondary cooling zone 1... and the secondary cooling zone N in sequence. The water inlet branch pipeline corresponding to the secondary cooling zone 1 is the 1st water inlet branch pipeline, and the water inlet branch pipeline corresponding to the secondary cooling zone 2 is the 2nd water inlet branch pipeline..., and preferably, a bypass pipeline with a valve is connected in parallel to the regulating valves of the 1st and 2nd water inlet branch pipelines.

[0021] Since a large pressure loss is easily generated when there are many casting stream water inlet pipelines, in order to ensure that the water pressure conditions of each casting stream water inlet pipeline are the same as much as possible, the outlet end of the total water inlet pipeline of the secondary cooling water regulating device is connected to X total water inlet branch pipelines, X is a positive integer less than M, and the M casting stream water inlet pipelines are distributed and connected to X total water inlet branch pipelines, that is, M1 casting stream water inlet pipelines are connected to the first total water inlet branch pipeline, M2 casting stream water inlet pipelines are connected to the second total water inlet branch pipeline..., Mx casting stream water inlet pipelines are connected to the Xth total water inlet branch pipeline, M1+M2...+M X = M. As a preference, the closer the number of casting strand water inlet pipelines connected to each total water inlet branch pipeline is, the better, and the best is equal.

[0022] Since a large pressure loss is easily generated when there are many casting strand air intake pipelines, in order to ensure that the air pressure conditions of each casting strand air intake pipeline are the same as much as possible, the outlet end of the total air intake pipeline of the second cooling air regulating device is connected to X total air intake branch pipelines, X is a positive integer less than M, and the M casting strand air intake pipelines are distributed and connected to X total air intake branch pipelines, that is, M1 casting strand air intake pipelines are connected to the first total air intake branch pipeline, M2 casting strand air intake pipelines are connected to the second total air intake branch pipeline..., Mx casting strand air intake pipelines are connected to the Xth total air intake branch pipeline, M1+M2...+M X= M. Preferably, the closer the number of casting strand air intake pipelines connected to each total air intake branch pipeline is, the better, and the best is that they are equal.

[0023] The multi-strand multi-section billet continuous casting machine can use the secondary cooling control system of the present invention to produce small billets by full water cooling, produce large billets by gas mist cooling, and produce large billets by gas mist cooling and small billets by full water cooling, and can independently control the cooling mode of each strand.

[0024] A. When all casting strands of the continuous casting machine are cooled by full water to produce small square billets, the control method is as follows:

[0025] Open the secondary cooling water regulating device and close the secondary cooling air regulating device, that is, open the valve of the main water inlet pipeline and close the valve of the main air inlet pipeline; when the main water inlet branch pipeline is set, open the valves of each main water inlet branch pipeline; open the valves of each casting stream water inlet pipeline; open the valves of each water inlet branch pipeline;

[0026] Preferably, the set flow value is achieved by adjusting the regulating valves of each water inlet branch pipeline; and further preferably, the bypass pipeline is opened to meet the cooling water volume required for high-speed billet production.

[0027] B. When each casting strand of the continuous casting machine adopts gas mist cooling to produce large square billets, the control method is as follows:

[0028] Start the secondary cooling water regulating device and the secondary cooling air regulating device at the same time, that is, open the main water inlet pipeline valve and open the main air inlet pipeline valve; when the main water inlet branch pipeline is set, open each main water inlet branch pipeline valve, when the main air inlet branch pipeline is set, open each main air inlet branch pipeline valve; open each casting strand water inlet pipeline valve and open each casting strand air inlet pipeline valve; open each water inlet branch pipeline valve and open each air inlet branch pipeline valve.

[0029] Preferably, the set flow value is achieved by adjusting the regulating valve of each water inlet branch pipeline; and further preferably, the set flow value is achieved by adjusting the regulating valve of each air inlet branch pipeline.

[0030] C. When part of the casting strands of the continuous casting machine adopts full water cooling to produce small square billets, and part of the casting strands adopts air mist cooling to produce large square billets, that is, full water cooling to produce small square billets and air mist cooling to produce large square billets are compatible, that is, the i-th casting strand adopts full water cooling to produce small square billets, and the j-th casting strand adopts air mist cooling to produce large square billets, 1≤i<M, 1≤j<M, i≠j, the control method is as follows:

[0031] Open the main water inlet pipe valve and the main air inlet pipe valve;

[0032] Open the valve of the casting strand water inlet pipeline of the i-th casting strand, and close the valve of the casting strand air inlet pipeline of the i-th casting strand; open the valves of the N water inlet branch pipelines connected to the i-th casting strand water inlet pipeline;

[0033] Open the valve of the casting strand water inlet pipeline of the j-th casting strand and open the valve of the casting strand air inlet pipeline of the j-th casting strand; open the valves of the N water inlet branch pipelines connected to the j-th casting strand water inlet pipeline and open the valves of the N air inlet branch pipelines connected to the j-th casting strand air inlet pipeline.

[0034] Compared with the prior art, the secondary cooling control system of the present invention is suitable for a multi-strand multi-section billet continuous casting machine and has the following beneficial effects:

[0035] (1) It can meet the requirements of cooling methods for multiple casting strands and large and small cross-section ingots;

[0036] (2) When using gas mist cooling to produce large billets and full water cooling to produce small billets, cooling zones 1 and 2 share a set of secondary cooling water regulating valves to reduce the performance requirements of the regulating valve's ultra-high water volume adjustment range and to simply and effectively reduce the cost of the device;

[0037] (3) Able to adapt to upgrading and transformation, and can eliminate the impact of pressure loss;

[0038] (4) While ensuring functionality, the cost is effectively reduced and the casting machine cooling system is simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of a secondary cooling control system for a 12-strand multi-section square billet continuous casting machine in an embodiment of the present invention.

[0040] Figure 1 The reference numerals in the drawings are:

[0041] 1- Main water inlet pipeline; 2- Local pressure gauge; 3- Pressure signal transmitter; 4- Manual valve; 5- Shut-off valve; 6- Flow meter; 7- Flow regulating valve, 8- Main water inlet first branch pipeline; 9- Main water inlet second branch pipeline; 10- Bypass pipeline; 11- Main air inlet pipeline; 12- Main air inlet first branch pipeline; 13- Main air inlet second branch pipeline; 14- Check valve; 15- Gas pressure regulating valve. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with embodiments. It should be pointed out that the embodiments described below are intended to facilitate the understanding of the present invention, and non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0043] The words “include”, “including” and the like used in the present invention should be interpreted as including rather than being exclusive or exhaustive; that is, the meaning is “including but not limited to”.

[0044] like Figure 1 As shown, a secondary cooling control system for a 12-strand multi-section billet continuous casting machine includes a set of secondary cooling water regulating devices and a set of secondary cooling compressed air system regulating devices.

[0045] In this embodiment, the secondary cooling control system is arranged in the continuous casting machine body area.

[0046] The secondary cooling water regulating device comprises a main water inlet pipeline 1, a cut-off valve 5 is arranged at the inlet end of the main water inlet pipeline 1, which is recorded as the main water inlet pipeline valve and is used to cut off or open the secondary cooling water supply. The main water inlet pipeline 1 is connected with two main water inlet branch pipelines, which are recorded as the first main water inlet branch pipeline 8 and the second main water inlet branch pipeline 9. A pressure detection mechanism is arranged at the inlet end of the main water inlet pipeline 1, which is used to detect the water pressure entering the main water inlet pipeline 1, and the pressure detection mechanism comprises a local pressure gauge 2 and a pressure signal transmitter 3.

[0047] A manual valve 4 is provided at the inlet end of the first branch of the total water inlet pipeline 8, which is referred to as the first branch of the total water inlet pipeline valve, and is used to cut off or open the connection with the total water inlet pipeline 1. A manual valve 4 is provided at the inlet end of the second branch of the total water inlet pipeline 9, which is referred to as the second branch of the total water inlet pipeline valve, and is used to cut off or open the connection with the total water inlet pipeline 1.

[0048] The first branch of the total water inlet pipeline 8 is connected to the water inlet pipelines of the six casting strands, namely, the first casting strand water inlet pipeline, the first casting strand water inlet pipeline ... the sixth casting strand water inlet pipeline. The second branch of the total water inlet pipeline 9 is connected to the water inlet pipelines of the other six casting strands, namely, the seventh casting strand water inlet pipeline, the eighth casting strand water inlet pipeline ... the twelfth casting strand water inlet pipeline.

[0049] A manual valve 4 and a pneumatic shut-off valve 5 are provided at the inlet end of each casting strand water inlet pipeline, which are referred to as casting strand water inlet pipeline valves, and are used to cut off or open the connection with the main water inlet branch pipeline. In addition, each casting strand water inlet pipeline is provided with an on-site pressure gauge 2, which is used to detect the water pressure entering the casting strand water inlet pipeline from the main water inlet branch pipeline.

[0050] Each casting strand water inlet pipeline is connected to 5 water inlet branch pipelines, which are respectively recorded as the 1st water inlet branch pipeline, the 2nd water inlet branch pipeline, ... the 5th water inlet branch pipeline. Each water inlet branch pipeline is provided with a manual valve 4, recorded as the water inlet branch pipeline valve, which is used to cut off or open the connection with the casting strand water inlet pipeline. Each water inlet branch pipeline is provided with a flow meter 6, a regulating valve 7 and an on-site pressure gauge 2. The flow meter 6 is used to detect the water flow rate flowing into the casting strand water inlet pipeline. The regulating valve 7 is used to adjust the water flow rate flowing into the casting strand water inlet pipeline. The on-site pressure gauge 2 is used to monitor the water pressure at the outlet end of the water inlet branch pipeline. The cooling areas at the outlet end of each water inlet branch pipeline are recorded as the second cooling zone 1, the second cooling zone 2 ... the second cooling zone 5. The cooling water volume of each cooling area can be adjusted by the regulating valve 7 of each water inlet branch pipeline to meet the process requirements under different working conditions.

[0051] Due to full water cooling during the production of high-drawing-speed small square billets, the cooling water volume is larger than the mist cooling during the production of large square billets, and the general regulating valve 7 cannot meet the ultra-high water volume regulation range. Therefore, in this embodiment, the regulating valve 7 of the first water inlet branch pipe and the second water inlet branch pipe connected to the casting strand water inlet pipes is connected in parallel with the bypass pipe 10 with a manual valve 4. When the bypass pipe is opened when producing high-drawing-speed small square billets, the full water cooling water volume for the high-drawing-speed small square billets can be achieved.

[0052] The secondary cooling air regulating device comprises a main air intake pipeline 11, a shut-off valve 5 is arranged at the inlet end of the main air intake pipeline 11, which is referred to as the main air intake pipeline valve and is used to cut off or open the secondary cooling air supply, and the outlet end of the main air intake pipeline 11 is connected to two branch pipelines, which are referred to as the first branch pipeline 12 of the main air intake and the second branch pipeline 13 of the main air intake. The main air intake pipeline 11 is provided with a pressure detection mechanism, which is used to detect the air pressure entering the main air intake pipeline 11, and the pressure detection mechanism comprises a pressure local pressure gauge 2 and a pressure signal transmitter 3.

[0053] A manual valve 4 is provided at the inlet end of the first branch line 12 of the total air intake, which is recorded as the first branch line valve of the total air intake, and is used to cut off or open the connection with the total air intake line 11. A manual valve 4 is provided at the inlet end of the second branch line 13 of the total air intake, which is recorded as the second branch line valve of the total air intake, and is used to cut off or open the connection with the total air intake line 11.

[0054] The first total air intake branch line 12 is connected to the air intake lines of the six casting strands, namely, the first casting strand air intake line, the first casting strand air intake line ... the sixth casting strand air intake line. The second total air intake branch line 13 is connected to the air intake lines of the other six casting strands, namely, the seventh casting strand air intake line, the eighth casting strand air intake line ... the twelfth casting strand air intake line.

[0055] A manual valve 4 and a pneumatic shut-off valve 5 are provided at the inlet end of each casting strand air inlet pipeline, which are referred to as casting strand air inlet pipeline valves, and are used to cut off or open the connection with the main air inlet branch pipeline. In addition, a gas pressure regulating valve 15 and a pressure signal transmitter 3 are provided at the inlet end of each casting strand air inlet pipeline, which are used to adjust and detect the air pressure of the casting strand air inlet pipeline.

[0056] In this embodiment, the cooling intensity of the secondary cooling zone 1 is large. Regardless of the size of the cross-section, the secondary cooling zone 1 adopts full water cooling. Each casting strand air intake pipeline is connected to 4 air intake branch pipelines, which are respectively recorded as the first air intake branch pipeline, the second air intake branch pipeline...the fourth air intake branch pipeline. A manual valve 4 is provided at the inlet end of each air intake branch pipeline, which is recorded as the air intake branch pipeline valve, which is used to cut off or open the connection with the casting strand air intake pipeline. Each air intake branch pipeline is provided with a pressure local gauge 2 and a check valve 14. The pressure local gauge 2 is used to detect the air pressure at the outlet end of the air intake branch pipeline. The outlet end of the 1st air intake branch pipeline faces the cooling area of ​​the second cooling zone 2, the outlet end of the 1st air intake branch pipeline faces the cooling area of ​​the second cooling zone 2, the outlet end of the 2nd air intake branch pipeline faces the cooling area of ​​the second cooling zone 3, the outlet end of the 3rd air intake branch pipeline faces the cooling area of ​​the second cooling zone 4, and the outlet end of the 4th air intake branch pipeline faces the cooling area of ​​the second cooling zone 5.

[0057] The 12-strand multi-section billet continuous casting machine can use this secondary cooling control system to control the production of small billets by full water cooling, the production of large billets by gas mist cooling, and the production of large billets by gas mist cooling and small billets by full water cooling. It can also control the cooling method of each strand independently, as follows.

[0058] (1) When all 12 strands of the continuous casting machine are cooled by full water to produce small square billets, the control method is as follows:

[0059] Open the secondary cooling water regulating device and close the secondary cooling air regulating device, that is, open the valve of the main water inlet pipeline and close the valve of the main air inlet pipeline; open the valve of the first branch of the main water inlet pipeline and open the valve of the second branch of the main water inlet pipeline; open the valves of each casting strand water inlet pipeline; open the valves of each water inlet branch pipeline;

[0060] By adjusting the regulating valve 7 of each water inlet branch pipeline to reach the set flow value, and opening the bypass pipeline 10 of the first water inlet branch pipeline and the second water inlet branch pipeline, the cooling water volume required for high-speed billet production can be met.

[0061] (2) When all 12 strands of the continuous casting machine are cooled by gas mist to produce large square billets, the control method is as follows:

[0062] Start the second cooling water regulating device and the second cooling air regulating device at the same time, that is, open the main water inlet pipeline valve and open the main air inlet pipeline valve; open the main water inlet first branch pipeline valve and open the main water inlet second branch pipeline valve, and open the main air inlet first branch pipeline valve and open the main air inlet second branch pipeline valve; open each casting strand water inlet pipeline valve and open each casting strand air inlet pipeline valve; open each water inlet branch pipeline valve, and reach the set water flow value by adjusting the regulating valve 7 of each water inlet branch pipeline, open each air inlet branch pipeline valve, and reach the set gas flow value by adjusting the gas pressure regulating valve 15 of each casting strand air inlet pipeline.

[0063] (3) When part of the casting strands of the continuous casting machine adopts full water cooling to produce small square billets, and part of the casting strands adopts gas mist cooling to produce large square billets, that is, when full water cooling to produce small square billets and gas mist cooling to produce large square billets are compatible, the control method is as follows:

[0064] For example, when the i-th strand is fully water-cooled to produce small square billets, i=1, 2, 3, 7, 8, 9, and the j-th strand is gas-mist-cooled to produce large square billets, j=4, 5, 6, 10, 11, 12, the details are as follows:

[0065] Open the valve of the main water inlet pipeline and the valve of the main air inlet pipeline; open the valve of the first branch of the main water inlet pipeline and the valve of the second branch of the main water inlet pipeline, open the valve of the first branch of the main air inlet pipeline and the valve of the second branch of the main air inlet pipeline;

[0066] Open the valves of the casting strand water inlet pipelines of the 1st, 2nd, 3rd, 7th, 8th and 9th casting strands, and close the valves of the casting strand air inlet pipelines of the 1st, 2nd, 3rd, 7th, 8th and 9th casting strands; open the valves of the 5 branch water inlet pipelines connected to the 1st, 2nd, 3rd, 7th, 8th and 9th casting strands water inlet pipelines, and open the bypass pipe 10 of the 1st branch water inlet pipeline and the 2nd branch water inlet pipeline connected to the 1st, 2nd, 3rd, 7th, 8th and 9th casting strands water inlet pipelines to meet the cooling water volume required for the high-speed small square billet production.

[0067] Open the valves of the casting strand water inlet pipelines of the 4th, 5th, 6th, 10th, 11th and 12th casting strands, and open the valves of the casting strand air inlet pipelines of the 4th, 5th, 6th, 10th, 11th and 12th casting strands; open the valves of the 5 water inlet branch pipelines connected to the casting strand water inlet pipelines of the 4th, 5th, 6th, 10th, 11th and 12th casting strands, and open the valves of the 4 air inlet branch pipelines connected to the casting strand air inlet pipelines of the 4th, 5th, 6th, 10th, 11th and 12th casting strands.

[0068] The above-described embodiments provide a detailed description of the technical solutions of the present invention. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, supplements or similar substitutions made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A secondary cooling control system for a multi-strand multi-section billet continuous casting machine, wherein the continuous casting machine is an M-strand continuous casting machine, where M is an integer greater than or equal to 2; wherein: The secondary cooling control system includes a secondary cooling water regulating device and a secondary cooling air regulating device; The secondary cooling water regulating device comprises a main water inlet pipeline, and a valve is arranged at the inlet end of the main water inlet pipeline, which is referred to as the main water inlet pipeline valve and is used to cut off or open the secondary cooling water supply; The outlet end of the main water inlet pipeline is connected to M casting water inlet pipelines; A valve is provided at the inlet end of each casting stream water inlet pipeline, which is referred to as a casting stream water inlet pipeline valve, and is used to cut off or open the connection with the main water inlet pipeline; each casting stream water inlet pipeline is connected to N water inlet branch pipelines, where N is an integer greater than or equal to 2; Each water inlet branch pipeline is provided with a valve, which is referred to as a water inlet branch pipeline valve, and is used to cut off or open the connection with the casting strand water inlet pipeline; the area that can be cooled at the outlet end of the nth water inlet branch pipeline is the secondary cooling zone n, where n is a positive integer and 1≤n≤N; The secondary cooling air regulating device comprises a main air intake pipeline, the inlet end of which is provided with a valve, referred to as the main air intake pipeline valve, for cutting off or opening the secondary cooling air supply; the outlet end of the main air intake pipeline is connected to M casting flow air intake pipelines; A valve is provided at the inlet end of each casting strand air inlet pipeline, which is referred to as a casting strand air inlet pipeline valve and is used to cut off or open the connection with the casting strand air inlet pipeline; each casting strand air inlet pipeline is connected to N air inlet branch pipelines; Each air intake branch pipeline is provided with a valve, recorded as an air intake branch pipeline valve, which is used to cut off or open the connection with the casting strand air intake pipeline; the outlet end of the nth air intake branch pipeline faces the secondary cooling zone n.

2. The secondary cooling control system according to claim 1, characterized in that: The secondary cooling zone 1 of each casting strand adopts full water cooling; each casting strand air inlet pipeline is connected to N-1 air inlet branch pipelines, and the outlet end of the nth air inlet branch pipeline faces the secondary cooling zone n+1.

3. The secondary cooling control system according to claim 1, characterized in that: The main water inlet pipeline is provided with a pressure detection mechanism for adjusting and detecting the water pressure entering the main water inlet pipeline; Preferably, the pressure detection mechanism includes an on-site pressure gauge and a pressure signal transmitter.

4. The secondary cooling control system according to claim 1, characterized in that: The casting strand water inlet pipeline is provided with a pressure detection mechanism for detecting the water pressure entering the casting strand water inlet pipeline; Preferably, the pressure detection mechanism includes an on-site pressure gauge.

5. The secondary cooling control system according to claim 1, characterized in that: The water inlet branch pipeline is provided with a flow meter for detecting the water flow rate flowing from the casting flow water inlet pipeline into the water inlet branch pipeline; Preferably, the water inlet branch pipeline is provided with a regulating valve for regulating the flow rate of water from the self-casting flow water inlet pipeline into the water inlet branch pipeline; Preferably, the water inlet branch pipeline is further provided with a pressure detection mechanism for detecting the water pressure at the outlet end of the water inlet branch pipeline; Preferably, the pressure detection mechanism includes an on-site pressure gauge.

6. The secondary cooling control system according to claim 1, characterized in that: The main air intake pipeline is provided with a pressure detection mechanism for adjusting and detecting the air pressure entering the main air intake pipeline; Preferably, the pressure detection mechanism includes an on-site pressure gauge and a pressure signal transmitter.

7. The secondary cooling control system according to claim 1, characterized in that: The casting strand air inlet pipeline is provided with a pressure detection mechanism for detecting the air pressure entering the casting strand air inlet pipeline; Preferably, the casting strand air inlet pipeline is further provided with a pressure regulating valve for regulating the air pressure of the casting strand air inlet pipeline; Preferably, the pressure detection mechanism includes a pressure signal transmitter.

8. The secondary cooling control system according to claim 1, characterized in that: 2≤N≤10, preferably 2≤N≤6.

9. The secondary cooling control system according to claim 1, characterized in that: The air intake branch pipeline is provided with a pressure detection mechanism for detecting the air pressure at the outlet end of the air intake branch pipeline; Preferably, the pressure detection mechanism comprises an on-site pressure gauge; Preferably, a check valve is provided in the intake branch line.

10. The secondary cooling control system according to claim 1, characterized in that: The regulating valve of the water inlet branch pipeline is connected in parallel with a bypass pipeline with a valve; Preferably, the bypass pipe is opened when producing high-speed billets; Preferably, along the moving direction of the billet, a bypass pipe with a valve is connected in parallel with the regulating valve of the water inlet branch pipe corresponding to the second cooling area that the billet first passes through, and further preferably, a bypass pipe with a valve is connected in parallel with the regulating valve of the water inlet branch pipe corresponding to the second cooling zone 1 and the second cooling zone 2.

11. The secondary cooling control system according to claim 1, characterized in that: The outlet end of the main water inlet pipeline is connected to X main water inlet branch pipelines, where X is a positive integer less than M, and the M casting strand water inlet pipelines are distributed and connected to the X main water inlet branch pipelines; Preferably, the closer the number of casting strand water inlet pipelines connected to each total water inlet branch pipeline is, the better.

12. The secondary cooling control system according to claim 1, characterized in that: The outlet end of the total air intake pipeline is connected to X total air intake branch pipelines, where X is a positive integer less than M, and the M casting strand air intake pipelines are distributed and connected to the X total air intake branch pipelines; Preferably, the closer the number of casting strand air intake pipelines connected to each total air intake branch pipeline is, the better.

13. The control method of the secondary cooling control system according to any one of claims 1 to 12, characterized in that: When all casting strands of the continuous casting machine are cooled by full water to produce small square billets, the control method is as follows: Open the secondary cooling water regulating device and close the secondary cooling air regulating device, that is, open the main water inlet pipeline valve and close the main air inlet pipeline valve; when the main water inlet branch pipeline is set, open the valves of each main water inlet branch pipeline; Open the valves of each casting strand water inlet pipeline; open the valves of each water inlet branch pipeline; When each casting strand of the continuous casting machine adopts gas mist cooling to produce large square billets, the control method is as follows: Simultaneously start the secondary cooling water regulating device and the secondary cooling air regulating device, that is, open the valve of the main water inlet pipeline and the valve of the main air inlet pipeline; when the main water inlet branch pipeline is set, open the valves of each main water inlet branch pipeline, and when the main air inlet branch pipeline is set, open the valves of each main air inlet branch pipeline; open the valves of each casting strand water inlet pipeline and open the valves of each casting strand air inlet pipeline; Open the valves of each water inlet branch pipeline and each air inlet branch pipeline; When part of the casting strands of the continuous casting machine adopts full water cooling to produce small square billets, and part of the casting strands adopts air mist cooling to produce large square billets, that is, full water cooling to produce small square billets and air mist cooling to produce large square billets are compatible, that is, the i-th casting strand adopts full water cooling to produce small square billets, and the j-th casting strand adopts air mist cooling to produce large square billets, 1≤i<M, 1≤j<M, i≠j, the control method is as follows: Open the main water inlet pipe valve and the main air inlet pipe valve; Open the valve of the water inlet pipeline of the i-th casting strand, and close the valve of the air inlet pipeline of the i-th casting strand; Open the valves of the N water inlet branch pipelines connected to the i-th casting strand water inlet pipeline; Open the valve of the water inlet pipeline of the j-th casting strand and open the valve of the air inlet pipeline of the j-th casting strand; Open the valves of the N water inlet branch pipelines connected to the j-th casting strand water inlet pipeline, and open the valves of the N air inlet branch pipelines connected to the j-th casting strand air inlet pipeline.

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