A composite stirring water model test device and test method for continuous casting round billet crystallizer

Abstract

The present invention belongs to the technical field of steel continuous casting test, and proposes a continuous casting round billet crystallizer composite stirring water model test device and test method, including a crystallizer, an immersion water inlet, a water inlet swirl stirrer, a stirrer drive motor, a crystallizer stirring paddle, a stirring paddle drive motor and a control terminal, the immersion water inlet is arranged inside the crystallizer, a water inlet pipe is inserted above the immersion water inlet, a water inlet control valve is arranged on the water inlet pipe, a water inlet swirl stirrer is arranged inside the immersion water inlet, the water inlet swirl stirrer is connected to the stirrer drive motor, a crystallizer stirring paddle is arranged on the lower side of the inside of the crystallizer, a crystallizer stirring paddle is connected to the stirring paddle drive motor, a water outlet pipe is connected to the crystallizer through a water outlet arranged below the side wall of the crystallizer, a water outlet control valve is arranged on the water outlet pipe, and a stirrer drive motor and a stirring paddle drive motor are both connected to the control terminal. The present invention can intuitively show the flow field change law in the crystallizer under the composite stirring action, and reduce the test cost.

Description

Technical Field

[0001] The invention belongs to the technical field of steel continuous casting experiments, and specifically discloses a composite stirring water model test device and a test method for a continuous casting round billet crystallizer. Background Art

[0002] In the process of continuous casting of round billets, the flow behavior of molten steel in the crystallizer directly affects the quality of the continuous casting billet. Steel companies use the crystallizer electromagnetic stirring technology to make the molten steel in the crystallizer rotate and flow, thereby optimizing the flow field in the crystallizer. However, when the intensity of the crystallizer electromagnetic stirring is too high, it will produce too strong secondary flow in the crystallizer, which is not conducive to the uniform distribution of solute elements in the continuous casting billet, thereby deteriorating the performance of steel. Based on the above problems, domestic and foreign researchers have proposed the water inlet swirl technology, which can make the molten steel in the crystallizer rotate to replace the crystallizer electromagnetic stirring.

[0003] At present, the nozzle swirl continuous casting technology can be realized by a variety of methods. The Chinese patent application with publication number CN114939651A discloses a continuous casting tundish device and process method with swirl effect, the Chinese patent with authorization number CN111482588B discloses an immersion nozzle swirl generator, tundish and application, the Chinese patent with authorization number CN105965003B discloses a nozzle swirl generator and a nozzle swirl continuous casting method, the Chinese patent with authorization number CN117718467B discloses an electromagnetic swirl enhanced immersion nozzle, and the Chinese patent with authorization number CN106166609B discloses an immersion nozzle electromagnetic swirl device. These technologies are to adjust the structure of the immersion nozzle or tundish, or use electromagnetic metallurgical technology to keep the molten steel in a rotating flow in the crystallizer after leaving the immersion nozzle. Related research has found that when the water inlet swirl technology is used in conjunction with the original crystallizer electromagnetic stirring, that is, when the molten steel in the crystallizer is compositely stirred, the severity of the macro-segregation defects of the continuous casting billet can be further reduced.

[0004] In the prior art, the research work on the effect of compound stirring on the flow field of the continuous casting round billet crystallizer is limited to industrial tests and numerical simulation studies. When industrial tests are used as research methods, the changing law of the flow trajectory of the molten steel in the crystallizer under the action of compound stirring cannot be intuitively displayed, and the results of numerical simulation studies need to be verified by physical simulation. Therefore, the water model physical simulation research method can be used to reduce the continuous casting site equipment according to a certain proportion, and intuitively display the effect of compound stirring on the flow field of the continuous casting round billet crystallizer. However, since the electromagnetic force cannot act on the fluid with water as the medium, the water model test device cannot use electromagnetic stirring technology to rotate the water, and when the water swirl technology is realized by adjusting the tundish or the immersed water nozzle structure, the water nozzle swirl intensity cannot be freely adjusted according to the test requirements. When examining different water nozzle swirl intensities as water model test conditions, it is necessary to manufacture multiple sets of swirl generator components, which will increase the manufacturing time and processing cost of the test device. In addition, there is currently no design of a water model test device that realizes the coupling effect of water nozzle swirl and crystallizer electromagnetic stirring. In view of the above-mentioned problems, it is necessary to study and design a new type of continuous casting round billet crystallizer composite stirring water model test device and usage method to overcome the problems existing in the existing research work on the effect of composite stirring on the flow field of the continuous casting round billet crystallizer. Summary of the invention

[0005] In order to solve the problems that the existing research work on the effect of composite stirring on the flow field in the continuous casting round billet crystallizer is limited to industrial experiments and numerical simulation research, but the industrial experiment cannot intuitively show the flow field change law, the numerical simulation research can only be verified through physical parameter simulation, and the existing device cost is relatively high, the present invention proposes a composite stirring water model test device and test method for a continuous casting round billet crystallizer.

[0006] The present invention provides a composite stirring water model test device for a continuous casting round billet crystallizer, comprising a crystallizer, an immersed water inlet, a water inlet pipe, a water inlet swirl agitator, a stirrer drive motor, a crystallizer stirring paddle, a stirring paddle drive motor, a water outlet pipe and a control terminal, wherein the immersed water inlet is arranged at the upper side of the interior of the crystallizer, the water inlet pipe is inserted above the immersed water inlet, a water inlet control valve is provided on the water inlet pipe, the water inlet swirl agitator is arranged inside the immersed water inlet, the water inlet swirl agitator is connected to the stirrer drive motor, the crystallizer stirring paddle is arranged at the lower side of the interior of the crystallizer, the crystallizer stirring paddle is connected to the stirring paddle drive motor, the water outlet pipe is connected to the crystallizer through a water outlet arranged below the side wall of the crystallizer, a water outlet control valve is provided on the water outlet pipe, and both the stirrer drive motor and the stirring paddle drive motor are connected to the control terminal.

[0007] According to a composite stirring water model test device for a continuous casting round billet crystallizer in some embodiments of the present application, a flow stabilizer is provided below the crystallizer stirring paddle, and the flow stabilizer is horizontally arranged inside the crystallizer.

[0008] According to a continuous casting round billet crystallizer composite stirring water model test device and test method in some embodiments of the present application, a water inlet flowmeter is provided on the water inlet pipe, and the water inlet flowmeter is connected to the control terminal; a water outlet flowmeter is provided on the water outlet pipe, and the water outlet flowmeter is connected to the control terminal.

[0009] According to a composite stirring water model test device for a continuous casting round billet crystallizer in some embodiments of the present application, the water inlet flow meter, water inlet control valve, water outlet flow meter, water outlet control valve, agitator drive motor and agitator paddle drive motor are all connected to the control terminal via a data transmission line.

[0010] According to a continuous casting round billet crystallizer composite stirring water model test device in some embodiments of the present application, the water inlet swirl agitator is a propeller-shaped structure, the water inlet swirl agitator is connected to the agitator drive motor through an agitator drive rod, and the rotation speed of the water inlet swirl agitator is 0 to 50 r / min.

[0011] According to some embodiments of the present application, a composite stirring water model test device for a continuous casting round billet crystallizer is provided, wherein the crystallizer stirring paddle is connected to the stirring paddle drive motor through a stirring paddle drive rod, the crystallizer stirring paddle comprises a plurality of L-shaped stirring paddles, each of the L-shaped stirring paddles comprises a horizontal portion and a vertical portion connected to each other, the horizontal portion end of each L-shaped stirring paddle is connected to the stirring paddle drive rod, the distance between the vertical portion of each L-shaped stirring paddle and the inner wall of the crystallizer is 10 mm, and the rotational speed of the crystallizer stirring paddle is 0 to 80 r / min.

[0012] According to a composite stirring water model test device for a continuous casting round billet crystallizer in some embodiments of the present application, a base is provided at the lower end of the crystallizer.

[0013] According to some embodiments of the present application, a composite stirring water model test device for a continuous casting round billet crystallizer also includes an acquisition system and a display component. The acquisition system includes a camera, a speed meter and a host computer. The camera is arranged outside the crystallizer, and is used to capture the trajectory image of water inside the crystallizer and the flow field state of water. The speed meter is arranged outside the crystallizer, and is used to measure the flow velocity of water at the liquid surface position. The camera and the speed meter are both connected to the host computer, and the host computer is used to receive and process the data of the trajectory image of water, the flow field state of water, and the flow velocity of water. The display component is connected to the host computer, and is used to display the trajectory image of water inside the crystallizer and the flow velocity of water through images.

[0014] The present invention also provides a test method for a continuous casting round billet crystallizer composite stirring water model test device, using the continuous casting round billet crystallizer composite stirring water model test device, comprising the following steps:

[0015] S1. Adjust the opening of the water inlet control valve and the opening of the water outlet control valve so that water flows into the immersion water inlet through the water inlet pipe, then flows into the crystallizer through the immersion water inlet, and finally flows out through the water outlet pipe, and ensure that the liquid level of water in the immersion water inlet and the crystallizer always meets the required test conditions;

[0016] S2. According to different test requirements, choose one of the following to test:

[0017] a. If the test requirement is to examine the effect of the rotation speed of the water in the crystallizer on the flow field of the water in the crystallizer, the rotation speed of the crystallizer stirring paddle is changed by the control terminal to obtain different rotation speeds of the water in the crystallizer;

[0018] b. If the test requirement is to examine the effect of the swirl intensity of the immersion nozzle on the flow field of the water in the crystallizer, the rotation speed of the swirl stirrer of the nozzle is changed by the control terminal to obtain different swirl intensities of the nozzle;

[0019] c. If the test requirement is to examine the effect of the coupling effect of the composite stirring on the flow field of the water in the crystallizer, the rotation speed of the crystallizer stirring paddle and the water inlet swirl stirrer is changed through the control terminal to obtain different rotation speeds of the water in the crystallizer and different water inlet swirl intensities;

[0020] S3. According to the test content of the water model test, the flow characteristics of the water in the crystallizer are obtained, and the effects of different test conditions on the flow field of the water in the crystallizer are obtained.

[0021] According to a test method for a composite stirring water model test device for a continuous casting round billet crystallizer in some embodiments of the present application, in step S3, a tracer is dripped into the crystallizer, and the situation in the crystallizer after the tracer is dripped is photographed by the camera device to obtain a trajectory image of the water in the crystallizer and a flow field state of the water, and the fluid flow velocity at the liquid surface position is measured by a speed meter.

[0022] The present invention proposes a composite stirring water model test device and test method for a continuous casting round billet crystallizer. A water inlet swirl agitator is installed inside an immersed water inlet, and a stirring motor of the agitator drives the water inlet swirl agitator to rotate, so that the fluid in the immersed water inlet rotates. A crystallizer stirring paddle is installed at the lower part of the crystallizer, and a stirring paddle driving motor drives the crystallizer stirring paddle to rotate, so that the fluid in the crystallizer rotates. The rotation speeds of the water inlet swirl agitator and the crystallizer stirring paddle are changed by a control terminal, so that the rotation speeds of the fluid in the immersed water inlet and the rotation speed of the fluid in the crystallizer can be controlled. The present invention can realize the investigation of the flow field characteristics of the continuous casting round billet crystallizer under the action of the water inlet swirl agitator, the crystallizer stirring paddle or the coupling of the water inlet swirl agitator and the crystallizer stirring paddle in the same test device. The test device can not only intuitively show the flow field change law, but also reduce the processing time and processing cost of equipment components when studying different test conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view schematic diagram of a composite stirring water model test device for a continuous casting round billet crystallizer of the present invention;

[0024] Figure 2 It is a top view schematic diagram of a composite stirring water model test device for a continuous casting round billet crystallizer of the present invention;

[0025] Figure 3 It is a top view schematic diagram of the stirring paddle structure of the crystallizer of the present invention;

[0026] Figure 4 This is a trajectory diagram of the crystallizer fluid flow from 1 second to 4 seconds when a single water inlet cyclone agitator is used in Example 2 of the present invention;

[0027] Figure 5 This is a velocity distribution diagram in the radial direction at the liquid surface when a cyclone stirrer with only a water inlet is used in Example 2 of the present invention;

[0028] Figure 6 This is a trajectory diagram of the crystallizer fluid flow from 1 second to 4 seconds when the water inlet swirl agitator and the crystallizer stirring paddle are coupled in Example 3 of the present invention;

[0029] Figure 7 This is a velocity distribution diagram in the radial direction at the liquid surface when the water inlet cyclone agitator and the crystallizer stirring paddle are coupled in Example 3 of the present invention;

[0030] Figure 8 It is a schematic front view of the test device when only the crystallizer stirring paddle is used in Example 4 of the present invention;

[0031] Fig. 9 This is a trajectory diagram of the crystallizer fluid flow from 1 second to 4 seconds when only a crystallizer stirring paddle is used in Example 4 of the present invention;

[0032] Fig.10 This is a velocity distribution diagram in the radial direction at the liquid surface when only a crystallizer stirring paddle is used in Example 4 of the present invention.

[0033] In the figure: 1. crystallizer, 2. immersed water inlet, 3. base, 4. flow stabilizing plate, 5. water inlet pipe, 6. water inlet flow meter, 7. water inlet control valve, 8. water outlet, 9. water outlet pipe, 10. water outlet flow meter, 11. water outlet control valve, 12. water inlet swirl agitator, 13. agitator drive rod, 14. agitator drive motor, 15. crystallizer stirring paddle, 16. stirring paddle drive rod, 17. stirring paddle drive motor, 18. data transmission line, 19. control terminal. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] Embodiment 1: This embodiment provides a continuous casting round billet crystallizer composite stirring water model test device, such as Figure 1 and Figure 2As shown, it includes a crystallizer 1, an immersion water inlet 2, a water inlet pipe 5, a water inlet swirl agitator 12, a stirrer drive motor 14, a crystallizer stirring paddle 15, a stirring paddle drive motor 17, a water outlet pipe 9 and a control terminal 19, the immersion water inlet 2 is arranged at the upper side of the inside of the crystallizer 1, the water inlet pipe 5 is inserted above the immersion water inlet 2, a water inlet control valve 7 is provided on the water inlet pipe 5, the water inlet swirl agitator 12 is arranged inside the immersion water inlet 2, the water inlet swirl agitator 12 is connected to the stirrer drive motor 14, the crystallizer stirring paddle 15 is arranged at the lower side of the inside of the crystallizer 1, the crystallizer stirring paddle 15 is connected to the stirring paddle drive motor 17, the water outlet pipe 9 is connected to the crystallizer 1 through the water outlet 8 arranged below the side wall of the crystallizer 1, the water outlet pipe 9 is provided with a water outlet control valve 11, and the stirrer drive motor 14 and the stirring paddle drive motor 17 are both connected to the control terminal 19. When in use, water flows through the water inlet pipe 5 through the immersion water inlet 2, enters the crystallizer 1, and then flows out from the water outlet pipe 9 connected to the water outlet 8 at the lower part of the crystallizer 1.

[0037] It should be noted that, as a preferred embodiment of the present invention, a flow stabilizer 4 may be provided below the crystallizer stirring paddle 15, and the flow stabilizer 4 is horizontally arranged inside the crystallizer 1, and the flow stabilizer 4 is used to stabilize the flow of fluid in the crystallizer 1. A water inlet flow meter 6 may be provided on the water inlet pipe 5, and the water inlet flow meter 6 can measure the water flow in the water inlet pipe 5, and the water inlet flow meter 6 is connected to the control terminal 19. When in use, according to the test needs, the control terminal 19 adjusts the water inlet control valve 7 according to the water flow collected by the water inlet flow meter 6 to change the water flow in the water inlet pipe 5; a water outlet flow meter 10 may be provided on the water outlet pipe 9, and the water outlet flow meter 10 can measure the water flow in the water outlet pipe 9, and the water outlet flow meter 10 is connected to the control terminal 19. When in use, according to the test needs, the control terminal 19 adjusts the water outlet control valve 11 according to the water flow collected by the water outlet flow meter 10 to change the water flow in the water outlet pipe 9. More preferably, the water inlet flow meter 6 , the water inlet control valve 7 , the water outlet flow meter 10 , the water outlet control valve 11 , the agitator drive motor 14 and the agitator paddle drive motor 17 are all connected to the control terminal 19 via a data transmission line 18 .

[0038] It should be noted that, as a preferred embodiment of the present invention, the water inlet swirl agitator 12 can be detachably installed inside the immersion water inlet 2. The water inlet swirl agitator 12 can be a propeller-shaped structure. The water inlet swirl agitator 12 can stir the water in the immersion water inlet 2, so that the water rotates circumferentially in the immersion water inlet 2. The water inlet swirl agitator 12 can be connected to the agitator drive motor 14 through the agitator drive rod 13. The agitator drive rod 13 drives the water inlet swirl agitator 12 to rotate under the action of the agitator drive motor 14. The rotation speed of the water inlet swirl agitator 12 can be 0-50r / min. The crystallizer stirring paddle 15 is connected to the stirring paddle drive motor 17 through the stirring paddle drive rod 16. Figure 3As shown, the crystallizer stirring paddle 15 includes a plurality of L-shaped stirring paddles, each L-shaped stirring paddle includes a horizontal portion and a vertical portion connected to each other, the horizontal end of each L-shaped stirring paddle is connected to the stirring paddle transmission rod 16, and the distance between the vertical portion of each L-shaped stirring paddle and the inner wall of the crystallizer 1 is 10 mm, ensuring that the crystallizer stirring paddle 15 has no contact with the inner wall of the crystallizer 1, and when the crystallizer stirring paddle 15 rotates, the maximum tangential velocity of the water rotating in the crystallizer 1 is near the inner wall of the crystallizer 1, and the stirring paddle transmission rod 16 drives the crystallizer stirring paddle 15 to rotate under the action of the stirring paddle transmission motor 17, and the rotation speed of the crystallizer stirring paddle 15 is 0-80r / min. When using this experimental device, according to the requirements of the water model test, the control terminal 19 can be used to adjust the rotation speed of the water inlet swirl stirrer 12 in the submerged water inlet 2, thereby changing the swirl intensity when the water leaves the submerged water inlet 2; the control terminal can be used to adjust the rotation speed of the crystallizer stirring paddle 15, thereby changing the rotation speed of the water under the action of the crystallizer stirring paddle 15.

[0039] It should be noted that, as a preferred embodiment of the present invention, a base 3 may be further provided at the lower end of the crystallizer 1, and the base 3 is used to support the crystallizer 1. More preferably, the cross section of the base 3 may be square, the bottom is hollow, and the material may be stainless steel, the water inlet pipe 5 and the water outlet pipe 9 may use PVC water pipes, the immersion nozzle 2 and the crystallizer 1 may be hollow cylindrical structures, and the material of the immersion nozzle 2 and the crystallizer 1 may be organic glass, and the use of organic glass may make it easier to observe the flow characteristics of water in the crystallizer 1 and the immersion nozzle 2.

[0040] It should be noted that, as a preferred embodiment of the present invention, a composite stirring water model test device for a continuous casting round billet crystallizer of the present invention also includes an acquisition system and a display component. The acquisition system includes a camera, a speed meter and a host computer. The camera is arranged outside the crystallizer 1, and is used to capture the trajectory image of water inside the crystallizer 1 and the flow field state of water. The speed meter is arranged outside the crystallizer 1, and is used to measure the flow velocity of water at the liquid surface position. The camera and the speed meter are both connected to the host computer, and the host computer is used to receive and process data of the trajectory image of water, the flow field state of water, and the flow velocity of water. The display component is connected to the host computer, and is used to display the trajectory image of water inside the crystallizer 1 and the flow velocity of water through images.

[0041] This embodiment also provides a test method for a continuous casting round billet crystallizer composite stirring water model test device, using the continuous casting round billet crystallizer composite stirring water model test device, comprising the following steps:

[0042] S1. Adjust the opening of the water inlet control valve 7 and the opening of the water outlet control valve 11, so that water flows into the immersion water inlet 2 through the water inlet pipe 5, then flows into the crystallizer 1 through the immersion water inlet 2, and finally flows out through the water outlet pipe 9, and ensure that the liquid level of water in the immersion water inlet 2 and the crystallizer 1 always meets the required test conditions;

[0043] S2. According to different test requirements, choose one of the following to test:

[0044] a. If the test requirement is to examine the effect of the rotation speed of the water in the crystallizer 1 on the flow field of the water in the crystallizer 1, the rotation speed of the crystallizer stirring paddle 15 is changed by the control terminal 19 to obtain different rotation speeds of the water in the crystallizer 1;

[0045] b. If the test requirement is to examine the effect of the swirl intensity of the immersion nozzle 2 on the flow field of the water in the crystallizer 1, the rotation speed of the nozzle swirl stirrer 12 is changed by the control terminal 19 to obtain different nozzle swirl intensities;

[0046] c. If the test requirement is to examine the effect of the coupling effect of the composite stirring on the flow field of the water in the crystallizer 1, the rotation speed of the crystallizer stirring paddle 15 and the water inlet swirl stirrer 12 is changed by the control terminal 19 to obtain different rotation speeds of the water in the crystallizer 1 and different water inlet swirl intensities;

[0047] S3. According to the test content of the water model test, the flow characteristics of the water in the crystallizer 1 are obtained, and the effects of different test conditions on the flow field of the water in the crystallizer 1 are obtained.

[0048] It should be noted that, as a preference of this embodiment, the water inlet swirl agitator 12 and the crystallizer stirring paddle 15 can be used separately or in coupling according to different test requirements. When the flow field in the crystallizer 1 is examined under the action of the crystallizer stirring paddle 15 alone, the water inlet swirl agitator 12 and the agitator transmission rod 13 can be moved to the outside of the immersion water inlet 2, and the crystallizer stirring paddle 15 is adjusted to the rotation speed required by the test. When the flow field in the crystallizer 1 is examined under the action of the water inlet swirl agitator 12 alone, the water inlet swirl agitator 12 is inserted into the inside of the immersion water inlet 2, the crystallizer stirring paddle 15 does not rotate, and the water inlet swirl agitator 12 is adjusted to the rotation speed required by the test. When the coupling effect of the water inlet swirl agitator 12 and the crystallizer stirring paddle 15 is examined, the water inlet swirl agitator 12 is inserted into the inside of the immersion water inlet 2, and the water inlet swirl agitator 12 and the crystallizer stirring paddle 15 are adjusted to the rotation speed required by the test.

[0049] It should be noted that, as a preferred embodiment of the present invention, in step S3, a tracer is dripped into the crystallizer 1, and the situation in the crystallizer 1 after the tracer is dripped is photographed by a camera device to obtain a trajectory image of water and a flow field state of water in the crystallizer 1, and the fluid flow velocity at the liquid surface position is measured by a velocimeter. More preferably, the tracer can be ink.

[0050] The composite stirring water model test device for a continuous casting round billet crystallizer of the present invention can freely adjust the rotation speed of the fluid in the submerged water inlet 2 and the water in the crystallizer 1 in the water model test, and does not need to manufacture multiple sets of water inlet swirl generators, so as to reduce the processing time and processing cost of the water model test device. The test method of the composite stirring water model test device for a continuous casting round billet crystallizer of the present invention can examine the single water inlet swirl technology or the crystallizer electromagnetic stirring technology according to the requirements of the test content, as well as the flow field characteristics in the crystallizer 1 when the two technologies are coupled.

[0051] Example 2: This example provides a test method for a composite stirring water model test device for a continuous casting round billet crystallizer. In this example, the test requirement is to examine the influence of a single water inlet swirl stirrer 12 on the flow field inside the crystallizer 1.

[0052] S1. Adjust the opening of the water inlet control valve 7 and the opening of the water outlet control valve 11, so that water flows into the immersion water inlet 2 through the water inlet pipe 5, then flows into the crystallizer 1 through the immersion water inlet 2, and finally flows out through the water outlet pipe 9, and ensure that the liquid level of water in the immersion water inlet 2 and the crystallizer 1 always meets the required test conditions;

[0053] S2. By changing the rotation speed of the nozzle swirl agitator 12 through the control terminal 19, the rotation speed of the nozzle swirl agitator 12 is adjusted to the test condition parameters;

[0054] S3. According to the test content of the water model test, the flow characteristics of the water in the crystallizer 1 are obtained to obtain the effect of different test conditions on the flow field of the water in the crystallizer 1;

[0055] In this embodiment, ink is used as a tracer, and a camera device is used to obtain a trajectory image of water flowing in the crystallizer 1 for 1 second to 4 seconds. Figure 4 When the rotation speed of the water inlet swirl stirrer 12 is 30r / min and the rotation speed of the crystallizer stirring paddle 15 is 0r / min, the flow trajectory of the water in the crystallizer 1 is as follows: Figure 4 As shown, after the water leaves the immersion nozzle 2, the flow trajectory is symmetrically distributed in the crystallizer 1. The fluid flow velocity at the liquid surface position is measured using a velocimeter. Figure 5 The velocity distribution of water flow in the radial direction is shown in FIG. 1 . The velocity increases gradually from the inner wall of the crystallizer 1 to the center of the crystallizer 1 .

[0056] Example 3: This example provides a test method for a composite stirring water model test device for a continuous casting round billet crystallizer. In this example, the test requirement is to examine the influence of the coupling action of the water inlet swirl stirrer 12 and the crystallizer stirring paddle 15 on the flow field inside the crystallizer 1.

[0057] S1. Adjust the opening of the water inlet control valve 7 and the opening of the water outlet control valve 11, so that water flows into the immersion water inlet 2 through the water inlet pipe 5, then flows into the crystallizer 1 through the immersion water inlet 2, and finally flows out through the water outlet pipe 9, and ensure that the liquid level of water in the immersion water inlet 2 and the crystallizer 1 always meets the required test conditions;

[0058] S2. By changing the rotation speed of the crystallizer stirring paddle 15 and the water inlet swirl stirrer 12 through the control terminal 19, the rotation speed of the crystallizer stirring paddle 15 and the water inlet swirl stirrer 12 is adjusted to the test condition parameters;

[0059] S3. According to the test content of the water model test, the flow characteristics of the water in the crystallizer 1 are obtained by a camera device to obtain the effect of different test conditions on the flow field of the water in the crystallizer 1;

[0060] In this embodiment, ink is used as a tracer to obtain a trajectory image of water flowing in the crystallizer 1 from 1 second to 4 seconds. Figure 6 When the rotation speed of the water inlet swirl stirrer 12 is 30r / min and the rotation speed of the crystallizer stirring paddle 15 is 70r / min, the flow trajectory of the water in the crystallizer 1 is as follows: Figure 6 As shown, after the water leaves the submerged water inlet 2, the flow trajectory is basically symmetrically distributed in the left and right directions in the crystallizer 1. A velocimeter is used to measure the fluid flow velocity at the liquid surface. Figure 7 The velocity distribution of the fluid flow in the radial direction is shown in FIG. 1 . The velocity gradually decreases from the inner wall surface of the crystallizer 1 to the center of the crystallizer 1 .

[0061] Example 4: This example provides a test method for a continuous casting round billet crystallizer composite stirring water model test device. In this example, the test requirement is to examine the influence of a single crystallizer stirring paddle 15 on the flow field inside the crystallizer 1.

[0062] S1. Adjust the opening of the water inlet control valve 7 and the opening of the water outlet control valve 11, so that water flows into the immersion water inlet 2 through the water inlet pipe 5, then flows into the crystallizer 1 through the immersion water inlet 2, and finally flows out through the water outlet pipe 9, and ensure that the liquid level of water in the immersion water inlet 2 and the crystallizer 1 always meets the required test conditions;

[0063] S2. Figure 8As shown, the water inlet cyclone stirrer 12 and the stirrer transmission rod 13 are moved out of the immersion water inlet 2, and the rotation speed of the crystallizer stirring paddle 15 is changed by the control terminal 19, and the rotation speed of the crystallizer stirring paddle 15 is adjusted to the water model test condition parameter;

[0064] S3. According to the test content of the water model test, the flow characteristics of the water in the crystallizer 1 are obtained by a camera device to obtain the effect of different test conditions on the flow field of the water in the crystallizer 1;

[0065] In this embodiment, ink is used as a tracer to obtain a trajectory image of water flowing in the crystallizer 1 from 1 second to 4 seconds. Fig. 9 When the speed of the water inlet swirl stirrer 12 is 0 r / min and the speed of the crystallizer stirring paddle 15 is 70 r / min, the flow trajectory of the water in the crystallizer 1 is as follows: Fig. 9 As shown in the figure, after the water leaves the immersion nozzle 2, the flow trajectory is unevenly distributed in the left and right directions in the crystallizer 1, and a biased flow occurs. The fluid flow velocity at the liquid surface position is measured using a velocimeter. Fig.10 The velocity distribution of the fluid flow in the radial direction is shown in FIG. 1 . The velocity gradually decreases from the inner wall surface of the crystallizer 1 to the center of the crystallizer 1 .

[0066] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A composite stirring water model test device for continuous casting round billet crystallizer, characterized in that: The invention comprises a crystallizer (1), an immersion water inlet (2), a water inlet pipe (5), a water inlet swirl agitator (12), a stirrer drive motor (14), a crystallizer stirring paddle (15), a stirring paddle drive motor (17), a water outlet pipe (9) and a control terminal (19), wherein the immersion water inlet (2) is arranged on the upper side of the interior of the crystallizer (1), the water inlet pipe (5) is inserted above the immersion water inlet (2), a water inlet control valve (7) is provided on the water inlet pipe (5), the water inlet swirl agitator (12) is arranged inside the immersion water inlet (2), and the The water inlet swirl agitator (12) is connected to the agitator drive motor (14), the crystallizer agitator (15) is arranged on the lower side of the crystallizer (1), the crystallizer agitator (15) is connected to the agitator drive motor (17), the water outlet pipe (9) is connected to the crystallizer (1) through a water outlet (8) arranged below the side wall of the crystallizer (1), a water outlet control valve (11) is provided on the water outlet pipe (9), and the agitator drive motor (14) and the agitator drive motor (17) are both connected to the control terminal (19).

2. A continuous casting round billet crystallizer composite stirring water model test device according to claim 1, characterized in that: A flow stabilizing plate (4) is provided below the crystallizer stirring paddle (15), and the flow stabilizing plate (4) is horizontally arranged inside the crystallizer (1).

3. The composite stirring water model test device for continuous casting round billet crystallizer according to claim 1 is characterized in that: The water inlet pipe (5) is provided with a water inlet flow meter (6), and the water inlet flow meter (6) is connected to the control terminal (19).

4. A continuous casting round billet crystallizer composite stirring water model test device according to claim 3, characterized in that: The water outlet pipe (9) is provided with a water outlet flow meter (10), and the water outlet flow meter (10) is connected to the control terminal (19).

5. A continuous casting round billet crystallizer composite stirring water model test device according to claim 4, characterized in that: The water inlet flow meter (6), the water inlet control valve (7), the water outlet flow meter (10), the water outlet control valve (11), the agitator drive motor (14) and the agitator paddle drive motor (17) are all connected to the control terminal (19) via a data transmission line (18).

6. The composite stirring water model test device for continuous casting round billet crystallizer according to claim 1, characterized in that: The water inlet swirl agitator (12) is a propeller-shaped structure, and the water inlet swirl agitator (12) is connected to the agitator drive motor (14) via an agitator drive rod (13). The rotation speed of the water inlet swirl agitator (12) is 0 to 50 r / min.

7. The composite stirring water model test device for continuous casting round billet crystallizer according to claim 1, characterized in that: The crystallizer stirring paddle (15) is connected to the stirring paddle drive motor (17) via a stirring paddle drive rod (16). The crystallizer stirring paddle (15) includes a plurality of L-shaped stirring paddles. Each of the L-shaped stirring paddles includes a horizontal portion and a vertical portion that are connected to each other. The horizontal portion end of each L-shaped stirring paddle is connected to the stirring paddle drive rod (16). The distance between the vertical portion of each L-shaped stirring paddle and the inner wall of the crystallizer (1) is 10 mm. The rotation speed of the crystallizer stirring paddle (15) is 0 to 80 r / min.

8. The composite stirring water model test device for continuous casting round billet crystallizer according to claim 1, characterized in that: The lower end of the crystallizer (1) is provided with a base (3).

9. A test method for a composite stirring water model test device for a continuous casting round billet crystallizer, characterized in that: The composite stirring water model test device for the continuous casting round billet crystallizer according to any one of claims 1 to 8 comprises the following steps: S1. Adjust the opening of the water inlet control valve (7) and the opening of the water outlet control valve (11) so that water flows into the immersion water inlet (2) through the water inlet pipe (5), then flows into the crystallizer (1) through the immersion water inlet (2), and finally flows out through the water outlet pipe (9), and ensure that the liquid level of water in the immersion water inlet (2) and the crystallizer (1) always meets the required test conditions; S2. According to different test requirements, choose one of the following to test: a. If the test requirement is to examine the effect of the rotation speed of the water in the crystallizer (1) on the flow field of the water in the crystallizer (1), the rotation speed of the crystallizer stirring paddle (15) is changed by the control terminal (19) to obtain different rotation speeds of the water in the crystallizer (1); b. If the test requirement is to examine the effect of the swirl intensity of the immersion nozzle (2) on the flow field of water in the crystallizer (1), the rotation speed of the nozzle swirl stirrer (12) is changed through the control terminal (19) to obtain different nozzle swirl intensities; c. If the test requirement is to examine the effect of the coupling effect of the composite stirring on the flow field of the water in the crystallizer (1), the rotation speed of the crystallizer stirring paddle (15) and the water inlet swirl stirrer (12) is changed through the control terminal (19) to obtain different rotation speeds of the water in the crystallizer (1) and different water inlet swirl intensities; S3. According to the test content of the water model test, the flow characteristics of the water in the crystallizer (1) are obtained, and the effects of different test conditions on the flow field of the water in the crystallizer (1) are obtained.

10. The test method of the composite stirring water model test device for continuous casting round billet crystallizer according to claim 9 is characterized in that: In step S3, a tracer is dripped into the crystallizer (1), and a camera device is used to capture the situation in the crystallizer (1) after the tracer is dripped in, so as to obtain a trajectory image of water in the crystallizer (1) and a flow field state of water, and a velocimeter is used to measure the fluid flow velocity at the liquid surface position.

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