Adjusting device and method for preventing cone displacement of crystallizer

Abstract

The invention discloses an adjusting device and a method for preventing a cone of a crystallizer from deviating. The adjusting device comprises a crystallizer body, and the crystallizer body comprises a wide plate and a narrow plate connected with the wide plate; the water tank is movably connected with the crystallizer body; the adjusting part is fixed to the side wall of the water tank, the adjusting part is used for adjusting the inclination angle of the water tank, the angle of the narrow plate connected with the water tank and the angle of the water tank change synchronously, and the adjusting part comprises a first lead screw and a second lead screw connected with the outer wall of the first lead screw in a sleeving mode; by using a crystallizer taper adjusting method of'upper opening jacking, upper opening pulling, lower opening pulling and lower opening jacking 'on narrow plates on the two sides of the crystallizer, the force borne by the narrow plates is just opposite to the force borne by the narrow plates in the production process, and the pair of counter-acting forces can be just counteracted, so that the stability of the taper is ensured, the taper of the crystallizer in the production process is ensured, and the production efficiency is improved. And the production and the quality stability are ensured.

Description

Technical Field

[0001] The present invention relates to the field of continuous casting mold, in particular to an adjusting device and a method for preventing the mold from running taper. Background Art

[0002] The mold taper is a key continuous casting parameter that determines the sizes of the upper and lower openings of the mold according to the shrinkage degree of the solidified billet shell in the mold. The main function of the slab mold taper is to ensure good contact between the cast billet and the mold wall during the solidification process, reduce the formation of air gaps, thereby improving the heat transfer efficiency and preventing surface defects of the cast billet. The taper design can also compensate for the shrinkage of the cast billet during the cooling process, avoid stress concentration and crack generation, and improve the quality and production efficiency of the cast billet.

[0003] The parameters of the mold taper are crucial. If it is too large or too small, adverse effects will occur. If the taper is too large, the contact pressure between the cast billet and the mold wall during the solidification process will increase significantly, resulting in excessive friction, which may cause surface cracks on the cast billet, and at the same time exacerbate the wear of the mold and shorten its service life. If the taper is too small, air gaps are likely to form between the cast billet and the mold wall, reducing the heat transfer efficiency, causing uneven cooling of the cast billet, and too high surface temperature, which may produce surface depressions, cracks and other defects. At the same time, the existence of air gaps will also cause uneven thickness of the solidified shell of the cast billet, increasing the risk of breakout and affecting production safety. Therefore, the stability of the mold taper parameters during the production process is particularly important.

[0004] During the long-term use of the mold, the mechanical clearance becomes larger, and the mold taper changes greatly during the production process, that is, the phenomenon of running taper occurs, which has a serious impact on production and quality. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that during the long-term use of the mold, the mechanical clearance becomes larger and the phenomenon of running taper occurs.

[0006] The above technical problem is solved by the following technical solution: The present invention provides an adjusting device, which includes a mold body including a wide plate and a narrow plate connected to the wide plate; a water tank movably connected to the mold body; and an adjusting member fixed to the side wall of the water tank, the adjusting member being used to adjust the inclination angle of the water tank, and the narrow plate connected to the water tank changes the angle synchronously with the water tank.

[0007] In a preferred embodiment of the adjusting device of the present invention: there are two groups of wide plates and two groups of narrow plates, and the wide plates and the narrow plates are connected in pairs by disc springs.

[0008] In a preferred embodiment of the adjusting device of the present invention: There are 4 groups of the water tanks, the wide plate is connected to the water tank by bolts, and the narrow plate is connected to the water tank by bolts.

[0009] In a preferred embodiment of the adjusting device of the present invention: The adjusting member includes a first lead screw and a second lead screw sleeved on the outer wall of the first lead screw.

[0010] In a preferred embodiment of the adjusting device of the present invention: There are two groups of first lead screws provided on the water tank connected to the narrow plate, and both of the two first lead screws located on the narrow plate are on the extension line of the Y-axis.

[0011] In a preferred embodiment of the adjusting device of the present invention: The inner wall of the second lead screw is provided with internal threads, and the outer wall of the second lead screw is provided with external threads; the internal threads are adapted to the threads on the outer wall of the first lead screw.

[0012] In a preferred embodiment of the adjusting device of the present invention: The inner wall of the second lead screw can reciprocally move along the outer wall of the first lead screw, and when the second lead screw reciprocally moves along the outer wall of the first lead screw, the inclination angle of the narrow plate can be changed.

[0013] In a preferred embodiment of the adjusting device of the present invention: The outer wall of the second lead screw meshes with a transmission lead screw, and when the transmission lead screw rotates, it drives the second lead screw to move along the outer wall of the first lead screw.

[0014] In a preferred embodiment of the adjusting device of the present invention: A gear rotating handle is provided on the transmission lead screw, and the rotating handle is used to rotate the transmission lead screw.

[0015] To solve the above technical problems, the present invention also provides a method for preventing the breakout of the mold taper, which is applied to the adjusting device, and further includes, first, by rotating the transmission lead screw, the second lead screw on the upper side of the water tank side wall moves along the first lead screw, so that the first lead screw pushes the upper part of the water tank to move towards the inner cavity of the mold until the taper above the water tank becomes 0°;

[0016] Then rotate the transmission lead screw so that the second lead screw on the upper side of the water tank side wall moves along the first lead screw, so that the first lead screw pushes the upper part of the water tank to move away from the inner cavity of the mold until the taper above the water tank reaches the production requirements;

[0017] Next, rotate the transmission lead screw so that the second lead screw on the lower side of the water tank side wall moves along the first lead screw, so that the first lead screw pushes the lower part of the water tank to move towards the inner cavity of the mold until the taper below the water tank becomes 0°;

[0018] Finally, rotate the transmission lead screw so that the second lead screw at the lower side of the water tank side wall moves along the first lead screw, causing the first lead screw to push the water tank downward and move away from the inner cavity of the mold until the taper above the water tank reaches the production requirements.

[0019] The beneficial effects of the present invention are as follows: By using the mold taper adjustment method of "top at the upper opening, pull at the upper opening, pull at the lower opening, and top at the lower opening" for the narrow plates on both sides of the mold, the forces received by the narrow plates are exactly opposite to the forces received by the narrow plates during the production process. These two reaction forces can just offset each other, ensuring the stability of the taper, guaranteeing the mold taper during the production process, and ensuring the stability of production and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention. Among them:

[0021] Figure 1 shows a schematic structural connection diagram of the adjusting device;

[0022] Figure 2 shows a top view of the overall structure of the adjusting device;

[0023] Figure 3 shows a demonstration step diagram of the mold narrow face taper adjustment of the adjusting device;

[0024] Figure 4 shows a force analysis diagram of the narrow plate before adjustment of the adjusting device;

[0025] Figure 5 shows a force analysis diagram of the narrow plate after adjustment of the adjusting device.

[0026] In the figure: 1. Mold body; 11. Wide plate; 12. Narrow plate; 2. Water tank; 3. Adjusting member; 31. First lead screw; 32. Second lead screw; 4. Transmission lead screw; 5. Rotating handle; 6. Fixed housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the specific embodiments and the drawings.

[0028] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention. However, these terms may vary according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0029] Referring to Figure 1 and Figure 2 , this embodiment provides an adjusting device, including a mold body 1, which includes a wide plate 11 and a narrow plate 12 connected to the wide plate 11; a water tank 2, the water tank 2 is movably connected to the mold body 1; and an adjusting member 3, the adjusting member 3 is fixed to the side wall of the water tank 2, and the adjusting member 3 is used to adjust the inclination angle of the water tank 2, and the narrow plate 12 connected to the water tank 2 changes synchronously with the angle of the water tank 2.

[0030] Referring to Figure 1 and Figure 2 , in some embodiments, there are two groups of wide plates 11 and two groups of narrow plates 12, and the wide plates 11 and the narrow plates 12 are connected to each other in pairs by disc springs; there are 4 groups of water tanks 2, the wide plates 11 are connected to the water tanks 2 by bolts, and the narrow plates 12 are connected to the water tanks 2 by bolts;

[0031] The adjusting member 3 includes a first lead screw 31 and a second lead screw 32 sleeved on the outer wall of the first lead screw 31; there are two groups of first lead screws 31 on the water tank 2 connected to the narrow plate 12, and both groups of first lead screws 31 located on the narrow plate 12 are on the extension line of the Y-axis; the inner wall of the second lead screw 32 is provided with an internal thread, and the outer wall of the second lead screw 32 is provided with an external thread; the internal thread is adapted to the thread on the outer wall of the first lead screw 31, and the inner wall of the second lead screw 32 can reciprocate along the outer wall of the first lead screw 31. When the second lead screw 32 reciprocates along the outer wall of the first lead screw 31, the inclination angle of the narrow plate 12 can be changed.

[0032] The outer wall of the second lead screw 32 meshes with a transmission lead screw 4. When the transmission lead screw 4 rotates, it drives the second lead screw 32 to move along the outer wall of the first lead screw 31; a gear rotating handle 5 is provided on the transmission lead screw 4, and the rotating handle 5 is used to rotate the transmission lead screw 4. It should be noted that the transmission lead screw 4 penetrates through a fixed housing 6, and the fixed housing is a structure of the equipment body. The function of the fixed housing is to fix the position of the transmission lead screw 4.

[0033] Referring to Figures 3 - 5 , the present invention also provides a method for preventing the mold from running cone, which is applied to the adjusting device and further includes:

[0034] First, rotate the transmission lead screw 4 so that the second lead screw 32 on the upper side of the side wall of the water tank 2 moves along the first lead screw 31, causing the first lead screw 31 to push the upper part of the water tank 2 towards the inner cavity of the mold until the taper above the water tank 2 becomes 0°. It should be noted that when the mold is under off-line maintenance, the narrow-side narrow plate 12 will be removed to check the data of the narrow plate 12, and then the narrow plate 12 will be reinstalled. At this time, the taper of the narrow plate 12 does not meet the requirements, so the taper of the narrow plate 12 needs to be adjusted to meet the operating requirements.

[0035] Then, rotate the transmission lead screw 4 so that the second lead screw 32 on the upper side of the side wall of the water tank 2 moves along the first lead screw 31, causing the first lead screw 31 to push the upper part of the water tank 2 away from the inner cavity of the mold until the taper above the water tank 2 reaches the production requirements;

[0036] It should be noted that by first pushing the upper opening of the narrow plate 12 in and then pulling the upper opening of the narrow plate 12 out, it is to make the upper opening of the narrow plate 12 receive a horizontal outward force during this process.

[0037] Next, rotate the transmission lead screw 4 so that the second lead screw 32 on the lower side of the side wall of the water tank 2 moves along the first lead screw 31, causing the first lead screw 31 to push the lower part of the water tank 2 towards the inner cavity of the mold until the taper below the water tank 2 becomes 0°;

[0038] Finally, rotate the transmission lead screw 4 so that the second lead screw 32 on the lower side of the side wall of the water tank 2 moves along the first lead screw 31, causing the first lead screw 31 to push the lower part of the water tank 2 away from the inner cavity of the mold until the taper above the water tank 2 reaches the production requirements.

[0039] It should be noted that by first pulling the lower opening of the narrow plate 12 out and then pushing the lower opening of the narrow plate 12 in, it is to make the lower opening of the narrow plate 12 receive a horizontal inward force during this process.

[0040] It should be noted that as Figure 4 shown, in the prior art, the narrow plate 12 of the mold is designed according to the solidification characteristics of molten steel in the mold, with the narrow surface designed to have an inverted taper. The main function is to ensure good contact between the billet and the mold wall during solidification, reduce the formation of air gaps, thereby improving the heat transfer efficiency and preventing surface defects of the billet. Among them, the size of the upper opening of the mold is larger than the size of the lower opening of the mold.

[0041] As Figure 4As shown in the figure, during the continuous casting production process, there is a billet in the mold. Considering that the mold has a structure with a larger upper opening and a smaller lower opening, the solidified billet shell will exert a force on the copper plate. Specifically, the lower opening of the mold is subject to the forces F2 and F4, and the upper opening of the mold is subject to the forces F1 and F3. The forces acting on the copper plate are transmitted to the screw rod. If there is a gap in the screw rod, it will cause the mold taper to change during the production process, thereby affecting the quality of the billet.

[0042] In the existing production process, if the taper of the narrow plate 12 is too large, the contact pressure between the billet and the mold wall during solidification will increase significantly, resulting in excessive friction, which may cause surface cracks on the billet. At the same time, it will exacerbate the wear of the mold and shorten its service life. In addition, the excessive taper will also cause the billet to be subjected to excessive mechanical stress during cooling and contraction, affecting the surface quality of the billet.

[0043] If the taper of the narrow plate 12 is too small, an air gap is likely to form between the billet and the mold wall, reducing the heat transfer efficiency, resulting in uneven cooling of the billet, too high surface temperature, and possible defects such as surface depressions and cracks. At the same time, the existence of the air gap will also cause uneven thickness of the solidified shell of the billet, increasing the risk of breakout and affecting production safety.

[0044] As Figure 5 As shown in the figure, after adjusting the taper of the narrow plate 12 of the mold by the method of this embodiment, the force received by the narrow plate 12 at this time is exactly opposite to the force received by the narrow plate 12 during the production process. This pair of reaction forces can eliminate the gap of the mold screw rod and ensure the stability of the taper.

[0045] To make the above objects and features of the present invention more obvious and understandable, the following will be described in conjunction with specific embodiments.

[0046] The following are the relevant experimental data of the method for preventing mold taper runaway in this embodiment:

[0047] 1. Comparative test (conventional adjustment)

[0048]

[0049] 2. Adjustment method for preventing taper runaway

[0050]

[0051]

[0052] 3. Comparison of test results

[0053] After adjusting the mold taper according to the above two methods and producing 5 tundishes respectively, the mold taper was measured again, as shown in the following table:

[0054] Method category Set taper Taper after shutdown Taper difference Conventional method 7.6 6.3 -1.3 Adjustment method to prevent taper deviation 7.6 7.63 +0.03

[0055] (1) Measure the taper and upper opening size of the mold after shutdown. The taper value of the narrow face is 6.3, and the taper has changed, with a change value of 1.3.

[0056] (2) Measure the taper and upper opening size of the mold after shutdown. The taper value of the narrow face is 7.63, and the upper opening size is 1535 mm. There is no phenomenon of taper deviation, and the data meets the production requirements.

[0057] From the above experimental data, it can be concluded that by using the mold taper adjustment method of "pushing at the upper opening, pulling at the upper opening, pulling at the lower opening, and pushing at the lower opening" for the two narrow plates 12 of the mold, the stability of the taper is ensured, the taper of the mold is guaranteed during the production process, and the stability of production and quality is ensured.

[0058] Finally, it should be noted that the methods and devices described in detail above are only examples, and those skilled in the art can modify these examples in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A regulating device, characterized in that: include, A crystallizer body (1), comprising a wide plate (11) and a narrow plate (12) connected to the wide plate (11); a water tank (2), the water tank (2) being movably connected to the crystallizer body (1); and An adjusting member (3) is fixed to a side wall of the water tank (2), and is used to adjust the inclination angle of the water tank (2). The narrow plate (12) connected to the water tank (2) changes in angle synchronously with the angle of the water tank (2).

2. The adjusting device according to claim 1, characterized in that: The wide plates (11) are provided in two groups, the narrow plates (12) are provided in two groups, and the wide plates (11) and the narrow plates (12) are connected in pairs via disc springs.

3. The adjusting device according to claim 2, characterized in that: The water tank (2) is provided with four groups, the wide plate (11) is connected to the water tank (2) by bolts, and the narrow plate (12) is connected to the water tank (2) by bolts.

4. The adjusting device according to claim 3, characterized in that: The adjusting member (3) comprises a first screw rod (31) and a second screw rod (32) sleeved with the outer wall of the first screw rod (31).

5. The adjusting device according to claim 4, characterized in that: Two groups of first screw rods (31) are arranged on the water tank (2) connected to the narrow plate (12), and the two groups of first screw rods (31) located on the narrow plate (12) are both located on the extension line of the Y axis.

6. The adjusting device according to claim 5, characterized in that: The inner wall of the second screw rod (32) is provided with an internal thread, and the outer wall of the second screw rod (32) is provided with an external thread; The internal thread is adapted to the thread on the outer wall of the first screw rod (31).

7. The adjusting device according to claim 6, characterized in that: The inner wall of the second screw rod (32) can reciprocate along the outer wall of the first screw rod (31), and the second screw rod (32) can change the inclination angle of the narrow plate (12) when reciprocating along the outer wall of the first screw rod (31).

8. The adjusting device according to claim 7, characterized in that: The outer wall of the second screw rod (32) is meshed with the transmission screw rod (4), and when the transmission screw rod (4) rotates, it drives the second screw rod (32) to move along the outer wall of the first screw rod (31).

9. The adjusting device according to claim 8, characterized in that: The transmission screw (4) is provided with a gear rotating handle (5), and the rotating handle (5) is used to rotate the transmission screw (4).

10. A method for preventing mold cone runaway, characterized in that: The regulating device as claimed in any one of claims 1 to 9 further comprises: First, the transmission screw (4) is rotated to cause the second screw (32) located above the side wall of the water tank (2) to move along the first screw (31), so that the first screw (31) pushes the upper part of the water tank (2) to move toward the inner cavity of the crystallizer until the taper above the water tank (2) becomes 0°; Then, the transmission screw (4) is rotated so that the second screw (32) located above the side wall of the water tank (2) moves along the first screw (31), so that the first screw (31) pushes the upper part of the water tank (2) to move away from the inner cavity of the crystallizer until the taper of the upper part of the water tank (2) meets the production requirements; Next, the transmission screw (4) is rotated so that the second screw (32) located below the side wall of the water tank (2) moves along the first screw (31), so that the first screw (31) pushes the lower part of the water tank (2) to move toward the inner cavity of the crystallizer until the taper below the water tank (2) becomes 0°; Finally, the transmission screw (4) is rotated so that the second screw (32) located below the side wall of the water tank (2) moves along the first screw (31), so that the first screw (31) pushes the lower part of the water tank (2) to move away from the inner cavity of the crystallizer until the taper above the water tank (2) meets the production requirements.

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