Flow reducing and yield increasing method for multi-billet continuous casting machine

Abstract

The invention belongs to the technical field of continuous casting machine production, and particularly discloses a flow reducing and yield increasing method for a multi-billet continuous casting machine, which comprises the following steps: adjusting the amount of molten steel generated in a converter: reducing the amount of molten steel tapping from 165 t to 140 t, and shortening the pouring period from 83 min to 73 min; flow blocking is formulated according to the pouring condition of the tundish; a continuous casting machine flow channel is divided into a pouring mode of two flow rectangular billets + four flow square billets and a pouring mode of two flow rectangular billets + three flow square billets; controlling the pulling speed of the steel billet: setting different pouring stages, and adjusting the pore sizes of the sliding blocks of the rectangular billet and the square billet according to the corresponding pouring stages, so as to control the pulling speed of the steel billet; and adjusting the pouring flow of the steel ladle: adjusting the amount of molten steel poured into the tundish by the steel ladle according to the pulling speed of the steel billet. The problems of square billet redundancy and resource waste generated by an original eight-machine eight-flow continuous casting machine are solved by adjusting the molten steel tapping amount, the pouring flow number and the sliding block hole diameter and controlling the flow number and the ton number of square billets, and the proportion of the square billet production ton number and the rectangular billet production ton number in the total amount is gradually balanced.

Description

Technical Field

[0001] The invention relates to the technical field of continuous casting machine production, and in particular to a method for reducing flow and increasing production of a multi-blank continuous casting machine. Background Art

[0002] A continuous casting machine is an industrial equipment used to continuously cast high-temperature molten steel into ingots with certain cross-sectional shapes and dimensions. The continuous casting machine pours liquid metal into a condensing device, and when the metal is partially condensed, pulls out a casting of a specific length and shape from the other end of the condensing device. There are many types of continuous casting machines, including vertical continuous casting machines and vertical bending continuous casting machines according to the structural shape, slab continuous casting machines and small square billet continuous casting machines according to the casting cross-section, and single-stream, double-stream or multi-stream continuous casting machines according to the number of ingot streams. These different types of continuous casting machines meet different production needs and further expand the application range and flexibility of continuous casting machines.

[0003] The known 8-machine 8-stream continuous casting machine is an efficient continuous casting equipment that can process eight streams of molten steel at the same time and produce multiple ingots. This type of continuous casting machine usually has high production efficiency and flexibility, and is suitable for large-scale steel production. The application scenarios of the 8-machine 8-stream continuous casting machine mainly include: Replacement of old equipment: Replace old continuous casting equipment in newly built steel plants to improve production efficiency and product quality; High-quality steel production: Used to produce high-quality steel grades such as high-carbon steel, tire cord steel, bearing steel and spring steel. The main features of the 8-machine 8-stream continuous casting machine include: Multi-stream molten steel processing: Can process eight streams of molten steel at the same time to improve production efficiency; Flexible production line: Suitable for the production of various specifications of ingots to meet different needs; Efficient cooling system: Ensure the quality of the ingots through the secondary cooling zone; Advanced control system: Ensure that the production parameters of each stream of molten steel are consistent to ensure product quality.

[0004] Although the 8-machine 8-stream continuous casting machine has the advantages of high efficiency, stability, flexibility and advancement, etc., when the continuous casting machine is in full flow operation, due to the flow of 2 streams of rectangular billets + 6 streams of square billets, the output of rectangular billets is small, while the output of square billets is redundant, resulting in a backlog of profile billet inventory, thus causing the problem of unnecessary consumption of resources and waste of costs. Summary of the invention

[0005] The purpose of the present invention is to provide a method for reducing flow and increasing production of a multi-blank continuous casting machine, so as to solve the problem that when an 8-machine 8-stream continuous casting machine is in full flow operation, the output of rectangular billets is small, while the output of square billets is redundant, resulting in resource consumption and cost waste.

[0006] To achieve the above object, the basic scheme provided by the present invention is: a method for reducing flow and increasing production of a multi-blank continuous casting machine, comprising adjusting the amount of molten steel generated in the converter, formulating a flow blocking scheme according to the pouring conditions of the tundish, controlling the billet drawing speed, and adjusting the ladle pouring flow rate, the method is as follows:

[0007] Adjust the amount of molten steel produced in the converter: reduce the amount of molten steel produced by the converter from 165t to 140t, shortening the pouring cycle from 83min to 73min;

[0008] Develop blocking flow according to the tundish pouring situation: divide the continuous casting machine flow channel into the pouring form of "2 flows of rectangular billets + 4 flows of square billets" and "2 flows of rectangular billets + 3 flows of square billets";

[0009] Control the billet drawing speed: Set different pouring stages and adjust the slider aperture size of rectangular billets and square billets according to the corresponding pouring stages to control the billet drawing speed;

[0010] Adjust the ladle pouring flow rate: adjust the amount of molten steel poured from the ladle into the tundish according to the billet pulling speed.

[0011] The working principle of the present invention is: first, the molten steel output of the converter is reduced from 165t to 140t, thereby reducing the casting cycle and reducing the temperature drop, adjusting the flow from the previous "2+6" operation to "2+4" and "2+3" operations, and setting the slider aperture to 19mm, 16mm, and 14.5mm, respectively matching different billet shapes and different casting time periods to reduce the waste of resources caused by redundancy of square billets, and finally adjusting the casting operation rhythm to balance the production of square billets and rectangular billets.

[0012] The beneficial effects of the present invention are as follows: by adjusting the amount of molten steel discharged, the pouring flow times, and the slider aperture, the number of flows and tonnage of square billets are controlled, thereby solving the problem of redundancy of square billets and waste of resources caused by the simultaneous casting of 2 flows of rectangular billets and 6 flows of square billets in the previous "2+6" operation. According to this method, the proportion of the production tonnage of square billets and the production tonnage of rectangular billets in the total amount can be gradually balanced.

[0013] Option 2: This is the preferred basic option. The specific blocking methods are as follows:

[0014] When casting 2-stream rectangular billets + 4-stream square billets, use a blocking cone to block the upper water inlets of runners 4 and 5, and the rectangular billets are cast through runners 1 and 2, and the square billets are cast through runners 3, 6, 7, and 8.

[0015] When casting 2-stream rectangular billets + 3-stream square billets, use a blocking cone to block the upper water inlets of runners 3, 4, and 5, and the rectangular billets are cast through runners 1 and 2, while the square billets are cast through runners 6, 7, and 8.

[0016] Use specially designed blocking cones to manually block the water inlet that needs to be blocked, thereby controlling the production flow and tonnage of square billets.

[0017] Scheme 3 is the preferred basic scheme. The method for controlling the billet drawing speed is to divide the pouring into three stages: the first three heats of steel, the 4th to 6th heats of steel, and the 7th heat of steel and later. Different flows and different aperture sliders are set according to different stages. The specific setting method is as follows:

[0018] When pouring the first three heats of steel, two streams of rectangular billets and four streams of square billets were cast, and the rectangular billets were set with a slide block with a hole diameter of 19 mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7 m / min; the square billet runner was set with a slide block with a hole diameter of 16 mm, and the average pulling speed of the square billets was controlled at 2.15 m / min.

[0019] When pouring the 4th to 6th heats of steel, two streams of rectangular billets and four streams of square billets were cast, and the rectangular billets were set with a slide block with a hole diameter of 19 mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7 m / min; the square billet runner was set with a slide block with a hole diameter of 14.5 mm, and the average pulling speed of the square billets was controlled at 1.85 m / min.

[0020] When pouring of the 7th heat of steel began, 2-stream rectangular billets and 3-stream square billets were cast. The rectangular billets were set with sliders with a hole diameter of 19mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7m / min; the square billet runners were set with sliders with a hole diameter of 14.5mm. At this time, the average pulling speed of the square billets was controlled at 1.85m / min.

[0021] In the first stage, the billet flow rate is reduced by 2 streams to form a "2+4" operation flow rate; the second stage has the same flow rate as the first stage, but the aperture of the billet slider is reduced, thereby slowing down the billet pulling speed; in the third stage, based on the flow rate and slider aperture in the second stage, the billet flow rate is reduced by 1 stream to form a "2+3" operation flow rate; the output of billets is gradually and slowly reduced.

[0022] Scheme 4 is the preferred basic scheme. The method for adjusting the ladle pouring flow is to control the billet pulling speed according to the aperture slider used in different periods of time, and calculate the average pouring volume, pouring cycle and production volume according to the service life of the tundish. The calculation method is as follows:

[0023] The pouring cycle of each furnace of steel = 140t (molten steel volume in ladle) / molten steel volume poured per minute,

[0024] The amount of molten steel poured per minute = rectangular billet poured per minute + square billet poured per minute,

[0025] Billet casting amount per minute = average billet casting speed * billet flow number * 0.17325,

[0026] The amount of rectangular billet cast per minute = average rectangular billet casting speed * rectangular billet flow number * 0.17325 * 165 * 225 / 150 / 150,

[0027] Billet production = billet casting volume per minute * casting cycle,

[0028] Rectangular billet production = molten steel in ladle - square billet production.

[0029] According to the drawing speed and pouring amount in each stage, 17 furnaces of steel can be poured within 20 hours. The third stage is the 7-17 furnace steel stage. According to the different slider apertures, the corresponding flows have corresponding drawing speeds. According to the mutual coordination of pouring amount, drawing speed and pouring cycle, the ideal production volume of rectangular billets and square billets can be obtained.

[0030] Option 5 is the preferred option of Option 3 or Option 4. The ladle preparation time between each heat of steel is controlled within 5-10 minutes. If the ladle preparation time is less than 5 minutes, it will be detrimental to the stability of the continuous casting production rhythm, and in severe cases, it may cause abnormal shutdown accidents of continuous casting; if the ladle preparation time is more than 10 minutes, the temperature drop of the molten steel in the ladle will increase, resulting in insufficient temperature of the molten steel during pouring.

[0031] Option 6 is the preferred option of Option 5. The frequency of temperature measurement during pouring is once every 5 minutes. When the temperature of the molten steel in the tundish is ≤1530℃, the pouring of the ladle is stopped and the high-temperature ladle is replaced. The low-temperature ladle is returned to the smelting area for heating. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below through specific embodiments:

[0033] Embodiment 1

[0034] A method for reducing flow and increasing production of a multi-blank continuous casting machine includes adjusting the amount of molten steel generated in a converter, formulating a flow blocking plan according to the pouring conditions of a tundish, controlling the billet drawing speed, and adjusting the ladle pouring flow rate, and the method is as follows:

[0035] Adjust the amount of molten steel produced in the converter: reduce the amount of molten steel produced by the converter from 165t to 140t, shortening the pouring cycle from 83min to 73min;

[0036] Develop blocking flow according to the tundish pouring situation: divide the continuous casting machine flow channel into the pouring forms of "2 flows of rectangular billets + 4 flows of square billets" and "2 flows of rectangular billets + 3 flows of square billets", and the blocking flow methods are as follows:

[0037] When casting 2-stream rectangular billets + 4-stream square billets, use a blocking cone to block the upper water inlets of runners 4 and 5, and the rectangular billets are cast through runners 1 and 2, and the square billets are cast through runners 3, 6, 7, and 8.

[0038] When casting 2-stream rectangular billets + 3-stream square billets, use a blocking cone to block the upper water inlets of runners 3, 4, and 5, and the rectangular billets are cast through runners 1 and 2, while the square billets are cast through runners 6, 7, and 8.

[0039] Control the billet pulling speed: Set different pouring stages, and adjust the slider aperture size of the rectangular billet and square billet according to the corresponding pouring stage, so as to control the billet pulling speed. The method of controlling the billet pulling speed is to divide the pouring into the first three heats of steel, the 4th to 6th heats of steel, and the 7th heat of steel and thereafter. Set different flows and different diameter sliders according to different stages. The specific setting method is as follows:

[0040] When pouring the first three heats of steel, two streams of rectangular billets and four streams of square billets were cast, and the rectangular billets were set with a slide block with a hole diameter of 19 mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7 m / min; the square billet runner was set with a slide block with a hole diameter of 16 mm, and the average pulling speed of the square billets was controlled at 2.15 m / min.

[0041] When pouring the 4th to 6th heats of steel, two streams of rectangular billets and four streams of square billets were cast, and the rectangular billets were set with a slide block with a hole diameter of 19 mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7 m / min; the square billet runner was set with a slide block with a hole diameter of 14.5 mm, and the average pulling speed of the square billets was controlled at 1.85 m / min.

[0042] When pouring of the 7th heat of steel began, 2-stream rectangular billets and 3-stream square billets were cast. The rectangular billets were set with sliders with a hole diameter of 19mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7m / min; the square billet runners were set with sliders with a hole diameter of 14.5mm. At this time, the average pulling speed of the square billets was controlled at 1.85m / min.

[0043] The method of adjusting the ladle pouring flow is to control the billet pulling speed according to the aperture slider used in different periods of time, and calculate the average pouring volume, pouring cycle and production volume according to the service life of the tundish. The calculation method is as follows:

[0044] The pouring cycle of each furnace of steel = 140t (molten steel volume in ladle) / molten steel volume poured per minute,

[0045] The amount of molten steel poured per minute = rectangular billet poured per minute + square billet poured per minute,

[0046] Billet casting amount per minute = average billet casting speed * billet flow number * 0.17325,

[0047] The amount of rectangular billet cast per minute = average rectangular billet casting speed * rectangular billet flow number * 0.17325 * 165 * 225 / 150 / 150,

[0048] Billet production = billet casting volume per minute * casting cycle,

[0049] Rectangular billet production = molten steel in ladle - square billet production.

[0050] In the first three furnaces of steel: the casting rate of square billets per minute is: 2.15*4*0.17325=1.49t, the casting rate of rectangular billets per minute is: 1.7*2*0.17325*165*225 / (150*150)=0.97t, the amount of molten steel poured per minute is: 1.49+0.97=2.46t, and the casting cycle of each furnace of steel is: 140 / 2.46=56.87min,

[0051] From this we can get:

[0052] Billet production: 1.49*56.87=87.73t,

[0053] The production volume of rectangular billets is: 140-87.73=55.27t;

[0054] In 4-6 furnaces of steel: the casting rate of square billets per minute is: 1.85*4*0.17325=1.28t, the casting rate of rectangular billets per minute is: 1.7*2*0.17325*165*225 / (150*150)=0.97t, the amount of molten steel poured per minute is: 1.28+0.97=2.25t, and the casting cycle of each furnace of steel is: 140 / 2.25=62.77min,

[0055] From this we can get:

[0056] Billet production: 1.25*62.77=79.63t,

[0057] Rectangular billet production: 140-79.63=60.37t;

[0058] 7th heat of steel and later: the casting of square billets per minute is: 1.85*3*0.17325=0.96t, the casting of rectangular billets per minute is: 1.7*2*0.17325*165*225 / (150*150)=0.97t, the amount of molten steel poured per minute is: 0.96+0.97=1.93t, and the casting cycle of each heat of steel is: 140 / 1.93=72.41min,

[0059] From this we can get:

[0060] Billet production: 0.96*72.41=69.62t,

[0061] The production volume of rectangular billets is: 140-69.62=70.37t.

[0062] Among them, 165*225 and 150*150 refer to the cross-sectional areas of rectangular billets and square billets respectively, and 0.17325 is the weight per meter of 150*150 cross-sectional continuous casting billets.

[0063] The implementation method of this embodiment is:

[0064] When using a continuous casting machine to cast steel billets, adjust the amount of molten steel in the converter to 140t, and then divide the pouring operation into two types: "2+4" operation flow and "2+3" operation flow:

[0065] 2+4 operation means that there are 8 runners in total, of which 2 runners produce rectangular billets and 4 runners produce square billets, and the steel flow inlets of runners 4 and 5 are blocked by blocking cones, and only runners 1, 2, 3, 6, 7, and 8 are used to process 2 rectangular billets and 4 square billets; 2+3 operation means that there are 8 runners in total, of which 2 runners produce rectangular billets and 3 runners produce square billets, and the steel flow inlets of runners 3, 4, and 5 are blocked by blocking cones, and only runners 1, 2, 6, 7, and 8 are used to process 2 rectangular billets and 3 square billets; the casting stage is further divided into the first 3 heats of steel, the 4th to 6th heats of steel, and the 7th heat of steel and thereafter:

[0066] When pouring the first three heats of steel, two streams of rectangular billets and four streams of square billets were cast, and the rectangular billets were set with a slide block with a hole diameter of 19 mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7 m / min; the square billet runner was set with a slide block with a hole diameter of 16 mm, and the average pulling speed of the square billets was controlled at 2.15 m / min.

[0067] When pouring the 4th to 6th heats of steel, two streams of rectangular billets and four streams of square billets were cast, and the rectangular billets were set with a slide block with a hole diameter of 19 mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7 m / min; the square billet runner was set with a slide block with a hole diameter of 14.5 mm, and the average pulling speed of the square billets was controlled at 1.85 m / min.

[0068] When pouring of the 7th heat of steel began, 2-stream rectangular billets and 3-stream square billets were cast. The rectangular billets were set with a slider with a 19mm aperture. At this time, the average pulling speed of the rectangular billets was controlled at 1.7m / min; the square billet runner was set with a slide with a 14.5mm aperture. At this time, the average pulling speed of the square billets was controlled at 1.85m / min.

[0069] Finally, after calculating the drawing speed, flow rate and casting cycle corresponding to each stage, the output and proportion of the steel billet are obtained as follows:

[0070] Phase 1: The production tonnage of rectangular billets is 55.27t, the production tonnage of square billets is 84.73t, and the output proportion of rectangular billets is 55.27 / 140=39.48%;

[0071] The second stage: the production tonnage of rectangular billets is 60.37t, the production tonnage of square billets is 79.63t, and the output proportion of rectangular billets is 60.37 / 140=43.12%;

[0072] The third stage: the production tonnage of rectangular billets is 70.38t, the production tonnage of square billets is 69.62t, and the output proportion of rectangular billets is 70.37 / 140=50.27%.

[0073] Embodiment 2

[0074] The continuous casting machine runners are divided into a casting form of "2 streams for rectangular billets + 4 streams for square billets". The upper water inlets of runners 4 and 5 are blocked with a blocking cone. The rectangular billets are operated through runners 1 and 2, and the square billets are operated through runners 3, 6, 7, and 8. A slider with a 19mm aperture is set for the rectangular billet, and a slider with a 16mm aperture is set for the square billet runner.

[0075] The specific implementation is:

[0076] The casting amount of square billet per minute is: 2.15*4*0.17325=1.49t, the casting amount of rectangular billet per minute is: 1.7*2*0.17325*165*225 / (150*150)=0.97t, the casting amount of molten steel per minute is: 1.49+0.97=2.46t, and the casting cycle of each furnace of steel is: 140 / 2.46=56.87min,

[0077] From this we can get:

[0078] Billet production: 1.49*56.87=87.73t,

[0079] The production volume of rectangular billets is: 140-87.73=55.27t;

[0080] At this time, the output of rectangular billets accounts for 39.48%.

[0081] Embodiment 3

[0082] The continuous casting machine runners are divided into the casting forms of "2 runners for rectangular billets + 4 runners for square billets" and "2 runners for rectangular billets + 4 runners for square billets". The upper water inlets of runners 4 and 5 are blocked with blocking cones. The rectangular billets are operated through runners 1 and 2, and the square billets are operated through runners 3, 6, 7, and 8.

[0083] When pouring the first three heats of steel, two streams of rectangular billets and four streams of square billets were cast. The rectangular billets were set with a slide block with a hole diameter of 19 mm, and the average pulling speed of the rectangular billets was controlled at 1.7 m / min. The square billet runner was set with a slide block with a hole diameter of 16 mm, and the average pulling speed of the square billets was controlled at 1.85 m / min.

[0084] When pouring of the fourth heat of steel began, 2-stream rectangular billets and 4-stream square billets were cast. The rectangular billets were set with sliders with a hole diameter of 19mm, and the average pulling speed of the rectangular billets was controlled at 1.7m / min. The square billet runners were set with sliders with a hole diameter of 14.5mm, and the average pulling speed of the square billets was controlled at 1.85m / min.

[0085] The specific implementation is:

[0086] The first three furnaces of steel: the casting rate of square billets per minute is: 2.15*4*0.17325=1.49t, the casting rate of rectangular billets per minute is: 1.7*2*0.17325*165*225 / (150*150)=0.97t, the casting volume of molten steel per minute is: 1.49+0.97=2.46t, and the casting cycle of each furnace of steel is: 140 / 2.46=56.87min,

[0087] From this we can get:

[0088] Billet production: 1.49*56.87=87.73t,

[0089] The production volume of rectangular billets is: 140-87.73=55.27t;

[0090] At this time, the output of rectangular billets accounts for 39.48%.

[0091] The 4th heat of steel starts: the casting of square billets per minute is: 1.85*4*0.17325=1.28t, the casting of rectangular billets per minute is: 1.7*2*0.17325*165*225 / (150*150)=0.97t, the amount of molten steel poured per minute is: 1.28+0.97=2.25t, and the casting cycle of each heat of steel is: 140 / 2.25=62.11min,

[0092] From this we can get:

[0093] Billet production: 1.25*62.11=79.63t,

[0094] Rectangular billet production: 140-79.63=60.37t;

[0095] At this time, the output of rectangular billets accounts for 43.12%.

[0096] Table 1. Comparison of production changes of square billets and rectangular billets

[0097]

[0098] From this table we can get:

[0099] After the method of comparative example 1 is implemented, the square billet produced in each casting is 84.73 tons, and the rectangular billet is 55.27 tons, and the proportion of rectangular billets is 39.48%;

[0100] After the method of comparative example 2 is implemented, the square billets produced by each of the first three heats of steel in one casting are 84.73 tons, and the rectangular billets are 55.27 tons, accounting for 39.48%; the square billets produced by each of the fourth heats of steel and thereafter are 79.63 tons, and the rectangular billets are 60.37 tons, accounting for 43.12%.

[0101] After the implementation of the method, in one casting cycle, the first three furnaces of steel produced 84.73 tons of square billets and 55.27 tons of rectangular billets, accounting for 39.48%; the 4th to 6th furnaces of steel produced 79.63 tons of square billets and 60.37 tons of rectangular billets, accounting for 43.12%; the 7th to 17th furnaces of steel produced 69.62 tons of square billets and 70.38 tons of rectangular billets, accounting for 50.27%. It can be seen that the present invention is the best solution in balancing the output of square billets and rectangular billets and preventing redundant square billet output.

[0102] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for reducing flow and increasing production of a multi-blade continuous casting machine, characterized in that: It includes adjusting the amount of molten steel generated in the converter, formulating a blocking plan based on the pouring conditions of the tundish, controlling the billet drawing speed, and adjusting the ladle pouring flow rate. The method is as follows: Adjust the amount of molten steel produced in the converter: reduce the amount of molten steel produced by the converter from 165t to 140t, shortening the pouring cycle from 83min to 73min; Develop blocking flow according to the pouring situation of the tundish: divide the continuous casting machine flow channel into the pouring forms of "2 flows of rectangular billets + 4 flows of square billets" and "2 flows of rectangular billets + 3 flows of square billets"; Control the billet drawing speed: Set different pouring stages and adjust the slider aperture size of rectangular billets and square billets according to the corresponding pouring stages to control the billet drawing speed; Adjust the ladle pouring flow rate: adjust the amount of molten steel poured from the ladle into the tundish according to the billet pulling speed.

2. The method for reducing flow and increasing production of a multi-blade continuous casting machine according to claim 1, characterized in that: The blocking methods are as follows: When casting 2-stream rectangular billets + 4-stream square billets, use a blocking cone to block the upper water inlets of runners 4 and 5, and the rectangular billets are cast through runners 1 and 2, and the square billets are cast through runners 3, 6, 7, and 8. When casting 2-stream rectangular billets + 3-stream square billets, use a blocking cone to block the upper water inlets of runners 3, 4, and 5, and the rectangular billets are cast through runners 1 and 2, while the square billets are cast through runners 6, 7, and 8.

3. The method for reducing flow and increasing production of a multi-blade continuous casting machine according to claim 1, characterized in that: The method for controlling the billet drawing speed is to divide the pouring into three stages: the first three heats of steel, the 4th to 6th heats of steel, and the 7th heat of steel and thereafter. Different flows and different aperture sliders are set according to different stages. The specific setting method is as follows: When pouring the first three heats of steel, two streams of rectangular billets and four streams of square billets were cast, and the rectangular billets were set with a slide block with a hole diameter of 19 mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7 m / min; the square billet runner was set with a slide block with a hole diameter of 16 mm, and the average pulling speed of the square billets was controlled at 2.15 m / min. When pouring the 4th to 6th heats of steel, two streams of rectangular billets and four streams of square billets were cast, and the rectangular billets were set with a slide block with a hole diameter of 19 mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7 m / min; the square billet runner was set with a slide block with a hole diameter of 14.5 mm, and the average pulling speed of the square billets was controlled at 1.85 m / min. When pouring of the 7th heat of steel began, 2-stream rectangular billets and 3-stream square billets were cast. The rectangular billets were set with sliders with a hole diameter of 19mm. At this time, the average pulling speed of the rectangular billets was controlled at 1.7m / min; the square billet runners were set with sliders with a hole diameter of 14.5mm. At this time, the average pulling speed of the square billets was controlled at 1.85m / min.

4. The method for reducing flow and increasing production of a multi-blade continuous casting machine according to claim 1, characterized in that: The method of adjusting the ladle pouring flow is to control the billet pulling speed according to the aperture slider used in different periods of time, and calculate the average pouring volume, pouring cycle and production volume according to the service life of the tundish and the amount of molten steel in the ladle. The calculation method is as follows: The pouring cycle of each furnace of steel = 140t (molten steel volume in ladle) / molten steel volume poured per minute, The amount of molten steel poured per minute = rectangular billet poured per minute + square billet poured per minute, Billet casting amount per minute = average billet casting speed * billet flow number * 0.17325, The amount of rectangular billet cast per minute = average rectangular billet casting speed * rectangular billet flow number * 0.17325 * 165 * 225 / 150 / 150, Billet production = billet casting volume per minute * casting cycle, Rectangular billet production = molten steel in ladle - square billet production.

5. A method for reducing flow and increasing production of a multi-blade continuous casting machine according to claim 3 or 4, characterized in that: The ladle preparation time between each heat of steel is controlled within 5-10 minutes.

6. A method for reducing flow and increasing production of a multi-blade continuous casting machine according to claim 5, characterized in that: The frequency of temperature measurement during pouring is once every 5 minutes. When the temperature of molten steel in the tundish is ≤1530℃, the pouring of the ladle is stopped and the high-temperature ladle is replaced, and the low-temperature ladle is returned to the smelting area for heating.

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