Secondary cooling control system and control method for multi-strand multi-surface billet caster

Abstract

The application discloses a secondary cooling control system and a control method for a multi-strand multi-section billet continuous caster. The secondary cooling control system comprises a secondary cooling water adjusting device and a secondary cooling gas adjusting device, can control the continuous caster to produce small square billets through full water cooling, produce large square billets through gas mist cooling, and compatibly produce large square billets through gas mist cooling and produce small square billets through full water cooling, and can independently control the cooling mode of each strand, thereby meeting any requirement of the cooling mode of the multi-strand and large and small section billets, and realizing simplification of the cooling system of the caster and cost reduction.

Description

Technical Field

[0001] This invention belongs to the field of continuous casting technology in iron and steel metallurgy, specifically relating to a secondary cooling control system and control method for multi-flow, multi-section square billet continuous casting machines. Background Technology

[0002] In current continuous casting production practices, in order to save on construction and operating costs while increasing casting machine output and utilization efficiency, multi-strand continuous casting machines that can produce billets of various sizes are often adopted. For example, a 12-strand continuous casting machine may have several strands producing small square billets with a cross-section of 150mm×150mm at high casting speed, while the remaining strands produce large square billets with cross-sections such as 320mm×380mm.

[0003] When producing small billets at high casting speeds, full water cooling is required, while air mist cooling is needed when producing large billets. If two completely independent secondary cooling systems are used when a continuous casting machine produces both large and small billets simultaneously, the piping and electrical control of the system will be more complex, the footprint will be larger, and the investment will be relatively higher. Summary of the Invention

[0004] In view of the above-mentioned technical status, the present invention provides a secondary cooling control system for a multi-flow, multi-section billet continuous casting machine. It can be used for the production of small billets with full water cooling and the production of large billets with air mist cooling, as well as the production of large billets with air mist cooling and the production of small billets with full water cooling. It can also independently control the cooling mode of each casting flow, thereby meeting any requirements of cooling mode for multiple casting flows and large and small section billets, and simplifying the casting machine cooling system and reducing costs.

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

[0006] The secondary cooling water regulating device includes a main water inlet pipeline, with a valve installed at the inlet end of the main water inlet pipeline, 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 flow water inlet pipelines;

[0007] Each casting inlet pipe is equipped with a valve at its inlet end, denoted as the casting inlet pipe valve, which is used to cut off or open the connection with the main inlet pipe; each casting inlet pipe is connected to N inlet branch pipes, where N is an integer greater than or equal to 2;

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

[0009] The secondary cooling air regulating device includes a main air intake pipeline, and a valve is installed at the inlet end of the main air intake pipeline, 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] Each casting inlet pipe is equipped with a valve at its inlet end, denoted as the casting inlet pipe valve, which is used to cut off or open the connection with the main inlet pipe; each casting inlet pipe is connected to N inlet branch pipes.

[0011] Each intake branch pipe is equipped with a valve, denoted as intake branch pipe valve, used to cut off or open the connection with the casting flow intake pipe; the outlet end of the nth intake branch pipe faces the nth cooling zone.

[0012] In the actual billet casting cooling process, the cooling intensity of the second cooling zone 1 is high. Regardless of the cross-section size, the second cooling zone 1 uses full water cooling. Therefore, it is preferable not to set up air inlet branch pipes in the second cooling zone 1. That is, each casting flow air inlet pipe is connected to N-1 air inlet branch pipes, and the outlet end of the nth air inlet branch pipe faces the second cooling zone n+1, 1≤n≤N-1.

[0013] Preferably, the main water inlet pipeline is equipped with a pressure detection mechanism for adjusting and detecting the water pressure entering the main water inlet pipeline. More preferably, the pressure detection mechanism includes a local pressure gauge and a pressure signal transmitter, and the pressure signal transmitter is preferably capable of remote monitoring.

[0014] Preferably, the casting inlet water pipeline is equipped with a pressure detection mechanism for detecting the water pressure entering the casting inlet water pipeline. The pressure detection mechanism includes a local pressure gauge.

[0015] Preferably, the inlet branch pipe is equipped with a flow meter for detecting the flow rate of water flowing from the self-casting inlet pipe into the inlet branch pipe. More preferably, it is equipped with a regulating valve for adjusting the flow rate of water flowing from the self-casting inlet pipe into the inlet branch pipe. Preferably, the inlet branch pipe is also equipped with a pressure detection mechanism for detecting the water pressure at the outlet end of the inlet branch pipe. More preferably, the pressure detection mechanism includes a local pressure gauge.

[0016] Preferably, the main intake pipe is equipped with a pressure detection mechanism for adjusting and detecting the air pressure entering the main intake pipe. More preferably, the pressure detection mechanism includes a local pressure gauge and a pressure signal transmitter, and the pressure signal transmitter is preferably capable of remote monitoring.

[0017] Preferably, the casting inlet air line is equipped with a pressure detection mechanism to detect the air pressure entering the casting inlet air line. More preferably, a pressure regulating valve is also provided to regulate the air pressure in the casting inlet air line. The pressure detection mechanism includes a pressure signal transmitter.

[0018] Preferably, 2≤N≤10, and even more preferably 2≤N≤6, such as 2, 3, 4, 5, 6, etc.

[0019] Preferably, the intake branch line is equipped with a pressure detection mechanism for detecting the air pressure at the outlet end of the intake branch line. The pressure detection mechanism includes a local pressure gauge. More preferably, the intake branch line is equipped with a check valve.

[0020] Since each casting stream can be used for high-speed small billet production or large billet production, the requirements for water pressure and air pressure during secondary cooling differ. Preferably, the inlet branch pipe is configured such that the cooling water volume required for high-speed full-water cooling of small billets is much larger than that for large billets produced using air mist cooling. General regulating valves cannot meet the ultra-high water volume adjustment range. Therefore, it is preferable that the regulating valve of the inlet branch pipe is connected in parallel with a bypass pipe equipped with a valve. When producing high-speed small billets, this bypass pipe is opened for auxiliary adjustment to achieve the required full-water cooling water volume for high-speed small billets. This auxiliary adjustment is particularly important in the initial stage of the billet cooling process, i.e., along the billet movement direction, preferably in the inlet branch pipe corresponding to the first secondary cooling zone, where the regulating valve is connected in parallel with a bypass pipe equipped with a valve. For example, the billet cold zone passes through the second cold zone 1, the second cold zone 2, ... and the second cold zone N in sequence. The water inlet branch pipe corresponding to the second cold zone 1 is the first water inlet branch pipe, the water inlet branch pipe corresponding to the second cold zone 2 is the second water inlet branch pipe, ... Preferably, the regulating valves of the first and second water inlet branch pipes are connected in parallel with the bypass pipes with valves.

[0021] Because a large number of casting flow inlet pipes can easily lead to significant pressure loss, in order to ensure that the water pressure conditions of each casting flow inlet pipe are as uniform as possible, the outlet end of the main inlet pipe of the secondary cooling water regulating device is connected to X main inlet branch pipes, where X is a positive integer less than M. The M casting flow inlet pipes are then distributed and connected to the X main inlet branch pipes, i.e., M1 casting flow inlet pipes are connected to the first main inlet branch pipe, M2 casting flow inlet pipes are connected to the second main inlet branch pipe, and so on, up to Mx casting flow inlet pipes connected to the Xth main inlet branch pipe, where M1 + M2 + ... + M... X =M. Preferably, the number of casting water inlet pipes connected to each main water inlet branch pipe should be as close as possible, and equal numbers are optimal.

[0022] Because a large number of casting gas inlet pipes can easily lead to significant pressure loss, in order to ensure that the gas pressure conditions of each casting gas inlet pipe are as uniform as possible, the outlet end of the main inlet pipe of the secondary cooling gas regulating device is connected to X main inlet branch pipes, where X is a positive integer less than M. The M casting gas inlet pipes are then distributed and connected to the X main inlet branch pipes, i.e., M1 casting gas inlet pipes are connected to the first main inlet branch pipe, M2 casting gas inlet pipes are connected to the second main inlet branch pipe, and so on, up to Mx casting gas inlet pipes connected to the Xth main inlet branch pipe, where M1 + M2 + ... + M... X=M. Preferably, the number of casting flow intake pipes connected to each main intake branch pipe should be as close as possible, and equal numbers are optimal.

[0023] The multi-flow, multi-section billet continuous casting machine of the present invention utilizes the secondary cooling control system to produce small billets using full water cooling, large billets using air mist cooling, and can also perform both air mist cooling and full water cooling for the production of small billets. Furthermore, it can independently control the cooling method for each flow.

[0024] A. When all casting streams of the continuous casting machine use full water cooling to produce small square billets, the control method is as follows:

[0025] Turn on the secondary cooling water regulating device and turn off the secondary cooling air regulating device, that is, open the main water inlet pipeline valve and close the main air inlet pipeline valve; when a main water inlet branch pipeline is set, open each main water inlet branch pipeline valve; open each casting flow water inlet pipeline valve; open each water inlet branch pipeline valve;

[0026] Preferably, the set flow rate is achieved by adjusting the regulating valves of each water inlet branch pipe; more preferably, the bypass pipe is opened to meet the cooling water requirements for high-speed small billet production.

[0027] B. When all casting streams of the continuous casting machine use air mist cooling to produce large square billets, the control method is as follows:

[0028] Simultaneously activate the secondary cooling water regulating device and the secondary cooling air regulating device, that is, open the main water inlet pipeline valve and the main air inlet pipeline valve; when a main water inlet branch pipeline is set, open each main water inlet branch pipeline valve; when a main air inlet branch pipeline is set, open each main air inlet branch pipeline valve; open each casting flow water inlet pipeline valve and each casting flow air inlet pipeline valve; open each water inlet branch pipeline valve and each air inlet branch pipeline valve.

[0029] Preferably, the set flow rate is achieved by adjusting the regulating valves of each water inlet branch pipe; even more preferably, the set flow rate is achieved by adjusting the regulating valves of each air inlet branch pipe.

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

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

[0032] Open the casting inlet water pipe valve of the i-th casting stream, close the casting air inlet pipe valve of the i-th casting stream; open the N inlet branch pipe valves connected to the i-th casting stream water inlet pipe;

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

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

[0035] (1) It can meet any requirements of multiple casting streams and large and small cross-section billet cooling methods;

[0036] (2) When producing large square billets by air mist cooling and producing small square billets by all-water cooling, a set of secondary cooling water regulating valves is shared between cooling zones 1 and 2. This is used to reduce the performance requirements of the regulating valve's ultra-high water flow regulation range and to simply and effectively reduce the cost of the equipment.

[0037] (3) It can adapt to upgrades and renovations and can eliminate the impact of pressure loss;

[0038] (4) While ensuring functionality, it effectively reduced costs and simplified the casting machine cooling system. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a secondary cooling control system for a 12-flow multi-section square billet continuous casting machine according to an embodiment of the present invention.

[0040] Figure 1 The attached figures are labeled as follows:

[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 Implementation

[0042] The present invention will be further described in detail below with reference to the embodiments. It should be noted that the embodiments described below are intended to facilitate the understanding of the present invention. Non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above description of the present invention are still within the protection scope of the present invention.

[0043] In this invention, the terms "including" and "comprising" should be interpreted as including rather than exclusive or exhaustive; that is, "including but not limited to".

[0044] like Figure 1 As shown, a secondary cooling control system for a 12-flow multi-section square 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 located in the continuous casting machine body area.

[0046] The secondary cooling water regulating device includes a main inlet pipe 1. A shut-off valve 5, denoted as the main inlet pipe valve, is installed at the inlet end of the main inlet pipe 1. This valve is used to shut off or open the secondary cooling water supply. The main inlet pipe 1 connects to two main inlet branch pipes, denoted as the first main inlet branch pipe 8 and the second main inlet branch pipe 9. A pressure detection mechanism is installed at the inlet end of the main inlet pipe 1 to detect the water pressure entering the main inlet pipe 1. The pressure detection mechanism includes a local pressure gauge 2 and a pressure signal transmitter 3.

[0047] A manual valve 4, denoted as the main water inlet first branch pipe 8, is installed at the inlet end of the main water inlet pipe 1. This valve is used to cut off or open the connection with the main water inlet pipe 1. A manual valve 4, denoted as the main water inlet second branch pipe 9, is installed at the inlet end of the main water inlet pipe 1. This valve is used to cut off or open the connection with the main water inlet pipe 1.

[0048] The first branch pipe 8 of the main water inlet connects to the water inlet pipes of 6 casting streams, namely, the first casting stream water inlet pipe, the first casting stream water inlet pipe, ... the sixth casting stream water inlet pipe. The second branch pipe 9 of the main water inlet connects to the water inlet pipes of another 6 casting streams, namely, the seventh casting stream water inlet pipe, the eighth casting stream water inlet pipe, ... the twelfth casting stream water inlet pipe.

[0049] Each casting inlet pipeline is equipped with a manual valve 4 and a pneumatic shut-off valve 5 at its inlet end, referred to as the casting inlet pipeline valve, used to cut off or open the connection with the main inlet branch pipeline. In addition, each casting inlet pipeline is equipped with a local pressure gauge 2 to detect the water pressure entering the casting inlet pipeline from the main inlet branch pipeline.

[0050] Each casting flow inlet pipe connects to five inlet branch pipes, designated as Inlet Branch Pipe 1, Inlet Branch Pipe 2, ..., Inlet Branch Pipe 5. Each inlet branch pipe is equipped with a manual valve 4, designated as the Inlet Branch Pipe Valve, used to disconnect or open the connection with the casting flow inlet pipe. Each inlet branch pipe is equipped with a flow meter 6, a regulating valve 7, and a local pressure gauge 2. The flow meter 6 detects the water flow rate flowing in from the casting flow inlet pipe. The regulating valve 7 regulates the water flow rate flowing in from the casting flow inlet pipe. The local pressure gauge 2 monitors the water pressure at the outlet of the inlet branch pipe. The cooling zones at the outlet of each inlet branch pipe are designated as Secondary Cooling Zone 1, Secondary Cooling Zone 2, ..., Secondary Cooling Zone 5. The cooling water volume in each cooling zone can be adjusted using the regulating valve 7 of each inlet branch pipe to meet the process requirements under different operating conditions.

[0051] Because high-speed small billet production uses full water cooling, the cooling water volume is larger compared to the air mist cooling used in large billet production. Generally, the regulating valve 7 cannot meet the ultra-high water volume regulation range. Therefore, in this embodiment, the regulating valve 7 of the first and second water inlet branches connected to each casting flow water inlet pipeline is connected in parallel with a bypass pipe 10 with a manual valve 4. When producing high-speed small billets, opening this bypass pipe can achieve the full water cooling volume for high-speed small billets.

[0052] The secondary air conditioning system includes a main air intake pipe 11. A shut-off valve 5, denoted as the main air intake pipe valve, is installed at the inlet end of the main air intake pipe 11 to shut off or open the secondary air supply. The outlet end of the main air intake pipe 11 is connected to two branch pipes, denoted as the first main air intake branch pipe 12 and the second main air intake branch pipe 13. A pressure detection mechanism is installed in the main air intake pipe 11 to detect the air pressure entering the main air intake pipe 11. The pressure detection mechanism includes a local pressure gauge 2 and a pressure signal transmitter 3.

[0053] A manual valve 4, denoted as the main intake first branch pipe valve, is installed at the inlet end of the main intake first branch pipe 12. It is used to cut off or open the connection with the main intake pipe 11. A manual valve 4, denoted as the main intake second branch pipe valve, is installed at the inlet end of the main intake second branch pipe 13. It is used to cut off or open the connection with the main intake pipe 11.

[0054] The main air intake first branch pipe 12 connects to the air intake pipes of 6 casting streams, namely, the first casting stream air intake pipe, the first casting stream air intake pipe, ... the sixth casting stream air intake pipe. The main air intake second branch pipe 13 connects to the air intake pipes of another 6 casting streams, namely, the seventh casting stream air intake pipe, the eighth casting stream air intake pipe, ... the twelfth casting stream air intake pipe.

[0055] Each casting inlet pipe is equipped with a manual valve 4 and a pneumatic shut-off valve 5 at its inlet end, referred to as the casting inlet pipe valve, for cutting off or opening the connection with the main inlet branch pipe. In addition, each casting inlet pipe is equipped with a gas pressure regulating valve 15 and a pressure signal transmitter 3 at its inlet end, for adjusting and detecting the gas pressure of the casting inlet pipe.

[0056] In this embodiment, the cooling intensity of the secondary cooling zone 1 is high; regardless of the cross-sectional size, the secondary cooling zone 1 uses full water cooling. Each casting inlet pipe connects to four inlet branch pipes, denoted as the 1st inlet branch pipe, the 2nd inlet branch pipe, ..., the 4th inlet branch pipe. A manual valve 4, denoted as the inlet branch pipe valve, is installed at the inlet end of each inlet branch pipe to cut off or open the connection with the casting inlet pipe. Each inlet branch pipe is equipped with a local pressure gauge 2 and a check valve 14. The local pressure gauge 2 is used to detect the air pressure at the outlet end of the inlet branch pipe. The cooling area facing the outlet end of the first intake branch pipe is the secondary cooling zone 2. The cooling area facing the outlet end of the first intake branch pipe is the secondary cooling zone 2. The cooling area facing the outlet end of the second intake branch pipe is the secondary cooling zone 3. The cooling area facing the outlet end of the third intake branch pipe is the secondary cooling zone 4. The cooling area facing the outlet end of the fourth intake branch pipe is the secondary cooling zone 5.

[0057] The 12-strand multi-section billet continuous casting machine utilizes this secondary cooling control system to control the production of small billets using full water cooling, the production of large billets using air mist cooling, and the production of large billets using both air mist cooling and full water cooling. It can also independently control the cooling method for each casting strand, as detailed below.

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

[0059] Turn on the secondary cooling water regulating device and turn off the secondary cooling air regulating device, that is, open the main water inlet pipeline valve and close the main air inlet pipeline valve; open the main water inlet first branch pipeline valve and the main water inlet second branch pipeline valve; open each casting flow water inlet pipeline valve; open each water inlet branch pipeline valve;

[0060] The set flow rate is achieved by adjusting the regulating valve 7 of each water inlet branch pipe, and the bypass pipes 10 of the first and second water inlet branch pipes are opened to meet the cooling water requirements for high-speed small square billet production.

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

[0062] Simultaneously activate the secondary cooling water regulating device and the secondary cooling air regulating device, that is, open the main water inlet pipeline valve and the main air inlet pipeline valve; open the main water inlet first branch pipeline valve and the main water inlet second branch pipeline valve, and open the main air inlet first branch pipeline valve and the main air inlet second branch pipeline valve; open each casting stream water inlet pipeline valve and each casting stream air inlet pipeline valve; open each water inlet branch pipeline valve, and adjust the regulating valve 7 of each water inlet branch pipeline to achieve the set water flow value; open each air inlet branch pipeline valve, and adjust the gas pressure regulating valve 15 of each casting stream air inlet pipeline to achieve the set gas flow value.

[0063] (3) When a portion of the casting stream of the continuous casting machine is cooled by full water to produce small square billets, and a portion of the casting stream is cooled by air mist to produce large square billets, i.e., when the production of small square billets by full water cooling and the production of large square billets by air mist cooling are carried out simultaneously, the control method is as follows:

[0064] For example, when the i-th casting stream is cooled entirely by water to produce small square billets (i=1, 2, 3, 7, 8, 9), and the j-th casting stream is cooled by air mist to produce large square billets (j=4, 5, 6, 10, 11, 12), the specific details are as follows:

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

[0066] Open the casting inlet water pipe valves of casting streams 1, 2, 3, 7, 8, and 9, and close the casting air inlet pipe valves of casting streams 1, 2, 3, 7, 8, and 9; open the valves of the 5 water inlet branch pipes connected to the casting stream water inlet pipes 1, 2, 3, 7, 8, and 9, and open the bypass pipes 10 of the first and second water inlet branch pipes connected to the casting stream water inlet pipes 1, 2, 3, 7, 8, and 9 to meet the cooling water volume required for high-speed small billet production.

[0067] Open the casting inlet water pipe valves of casting streams 4, 5, 6, 10, 11, and 12, and open the casting air inlet pipe valves of casting streams 4, 5, 6, 10, 11, and 12; open the valves of the 5 water inlet branch pipes connected to the casting stream water inlet pipes 4, 5, 6, 10, 11, and 12, and open the valves of the 4 air inlet branch pipes connected to the casting stream air inlet pipes 4, 5, 6, 10, 11, and 12.

[0068] The above embodiments provide a detailed description of the technical solution 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, additions, or similar substitutions made within the scope of the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A secondary cooling control system for a multi-flow, multi-section square billet continuous casting machine, wherein the continuous casting machine is an M-flow continuous casting machine, where M is an integer greater than or equal to 2; characterized in that: 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 includes a main water inlet pipeline, and a valve is installed at the inlet end of the main water inlet pipeline, referred to as the main water inlet pipeline valve, which 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; Each casting inlet pipe is equipped with a valve at its inlet end, denoted as the casting inlet pipe valve, which is used to cut off or open the connection with the main inlet pipe; each casting inlet pipe is connected to N inlet branch pipes, where N is an integer greater than or equal to 2; Each inlet branch pipe is equipped with a valve, denoted as the inlet branch pipe valve, which is used to cut off or open the connection with the casting inlet pipe; the area that can be cooled at the outlet end of the nth inlet branch pipe is the secondary cooling n-zone, where n is a positive integer and 1≤n≤N; The secondary cooling air regulating device includes a main air intake pipeline, and a valve is installed at the inlet end of the main air intake pipeline, 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. Each casting inlet pipe is equipped with a valve at its inlet end, denoted as the casting inlet pipe valve, which is used to cut off or open the connection with the casting inlet pipe; each casting inlet pipe is connected to N inlet branch pipes. Each intake branch pipe is equipped with a valve, denoted as intake branch pipe valve, used to cut off or open the connection with the casting flow intake pipe; the outlet end of the nth intake branch pipe faces the nth cooling zone.

2. The secondary cooling control system as described in claim 1, characterized in that: The secondary cooling zone 1 of each casting stream is fully water-cooled; each casting stream air inlet pipe is connected to N-1 air inlet branch pipes, and the outlet end of the nth air inlet branch pipe faces the secondary cooling zone n+1.

3. The secondary cooling control system as described in claim 1, characterized in that: The main water inlet pipeline is equipped with a pressure detection mechanism to regulate and detect the water pressure entering the main water inlet pipeline.

4. The secondary cooling control system as described in claim 3, characterized in that: The pressure detection mechanism includes a local pressure gauge and a pressure signal transmitter.

5. The secondary cooling control system as described in claim 1, characterized in that: The casting inlet water pipeline is equipped with a pressure detection mechanism to detect the water pressure entering the casting inlet water pipeline.

6. The secondary cooling control system as described in claim 5, characterized in that: The pressure detection mechanism includes a local pressure gauge.

7. The secondary cooling control system as described in claim 1, characterized in that: The inlet branch pipe is equipped with a flow meter for detecting the flow rate of water flowing into the inlet branch pipe from the self-casting inlet pipe.

8. The secondary cooling control system as described in claim 7, characterized in that: The inlet branch pipe is equipped with a regulating valve for adjusting the flow rate of water flowing from the self-casting inlet pipe into the inlet branch pipe.

9. The secondary cooling control system as described in claim 8, characterized in that: The inlet branch pipe is also equipped with a pressure detection mechanism to detect the water pressure at the outlet end of the inlet branch pipe.

10. The secondary cooling control system as described in claim 9, characterized in that: The pressure detection mechanism includes a local pressure gauge.

11. The secondary cooling control system as described in claim 1, characterized in that: The main intake pipe is equipped with a pressure detection mechanism to adjust and detect the air pressure entering the main intake pipe.

12. The secondary cooling control system as described in claim 11, characterized in that: The pressure detection mechanism includes a local pressure gauge and a pressure signal transmitter.

13. The secondary cooling control system as described in claim 1, characterized in that: The casting inlet pipe is equipped with a pressure detection mechanism to detect the air pressure entering the casting inlet pipe.

14. The secondary cooling control system as described in claim 13, characterized in that: The casting inlet air pipeline is also equipped with a pressure regulating valve to regulate the air pressure of the casting inlet air pipeline.

15. The secondary cooling control system as described in claim 13, characterized in that: The pressure detection mechanism includes a pressure signal transmitter.

16. The secondary cooling control system as described in claim 1, characterized in that: 2≤N≤10。 17. The secondary cooling control system as described in claim 16, characterized in that: 2≤N≤6。 18. The secondary cooling control system as described in claim 1, characterized in that: The intake branch pipe is equipped with a pressure detection mechanism to detect the air pressure at the outlet end of the intake branch pipe.

19. The secondary cooling control system as described in claim 18, characterized in that: The pressure detection mechanism includes a local pressure gauge.

20. The secondary cooling control system as described in claim 1, characterized in that: The intake branch line is equipped with a check valve.

21. The secondary cooling control system as described in claim 8, characterized in that: The regulating valve of the inlet branch pipe is connected in parallel with the bypass pipe with the valve.

22. The secondary cooling control system as described in claim 21, characterized in that: The bypass pipe is opened when producing high-speed small square billets.

23. The secondary cooling control system as described in claim 21, characterized in that: Along the direction of billet movement, the regulating valve of the water inlet branch corresponding to the first secondary cooling zone is connected in parallel with the bypass pipe with the valve.

24. The secondary cooling control system as described in claim 23, characterized in that: The regulating valves of the corresponding inlet branch pipes in the secondary cooling zones 1 and 2 are connected in parallel with the bypass pipes with valves.

25. The secondary cooling control system as described in 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. The M casting water inlet pipelines are distributed to connect to the X main water inlet branch pipelines.

26. The secondary cooling control system as described in claim 25, characterized in that: The closer the number of casting water inlet pipes connected to each main water inlet branch pipe, the better.

27. The secondary cooling control system as described in claim 1, characterized in that: The outlet end of the main intake pipe is connected to X main intake branch pipes, where X is a positive integer less than M. The M casting flow intake pipes are distributed to connect to the X main intake branch pipes.

28. The secondary cooling control system as described in claim 27, characterized in that: The closer the number of casting flow intake pipes connected to each main intake branch pipe, the better.

29. The control method for the secondary cooling control system according to any one of claims 1 to 28, characterized in that: When all casting streams of the continuous casting machine are produced using full water cooling to produce small square billets, the control method is as follows: Turn on the secondary cooling water regulating device and turn off the secondary cooling air regulating device, that is, open the main water inlet valve and close the main air inlet valve; when a main water inlet branch pipe is installed, open the valves of each main water inlet branch pipe. Open the valves on all casting inlet water pipes; open the valves on all branch inlet water pipes; When all casting streams of the continuous casting machine are cooled by air mist to produce large square billets, the control method is as follows: Simultaneously activate the secondary cooling water regulating device and the secondary cooling air regulating device, that is, open the main water inlet pipeline valve and the main air inlet pipeline valve; when a main water inlet branch pipeline is set, open each main water inlet branch pipeline valve; when a main air inlet branch pipeline is set, open each main air inlet branch pipeline valve; open each casting flow water inlet pipeline valve and each casting flow air inlet pipeline valve. Open the valves on each water inlet branch pipe and the valves on each air inlet branch pipe; When a portion of the casting stream of the continuous casting machine is cooled by full water to produce small billets, and a portion is cooled by air mist to produce large billets, i.e., when the production of small billets by full water cooling and the production of large billets by air mist cooling are carried out simultaneously, that is, when the i-th casting stream is cooled by full water to produce small billets and the j-th casting stream is cooled by air mist to produce large billets, 1≤i<M, 1≤j<M, and i≠j, the control method is as follows: Open the main water inlet valve and the main air inlet valve; Open the casting inlet water valve of the i-th casting stream and close the casting inlet air valve of the i-th casting stream; Open the valves of the N inlet branch pipes connected to the i-th casting inlet pipe; Open the casting inlet water valve of the j-th casting stream and open the casting inlet air valve of the j-th casting stream; Open the valves of the N water inlet branch pipes connected to the j-th casting flow water inlet pipe, and also open the valves of the N air inlet branch pipes connected to the j-th casting flow air inlet pipe.

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