Mould copper plate with upper and lower openings capable of being repaired in reverse order

Abstract

The utility model provides a kind of crystallizer copper plate with up and down mouth can be repaired upside down, it is related to continuous casting technical field, several columns of thread holes are set on the back of crystallizer copper plate, several columns of cooling water grooves are equipped between adjacent two columns of thread holes, cooling water groove, thread hole are arranged with center line O between the up and down mouth of crystallizer copper plate symmetry, cooling water groove includes first cooling water groove, two ends of first cooling water groove are respectively equipped with mutually symmetrical second cooling water groove;The depth of second cooling water groove is less than the depth of first cooling water groove.The depth of first cooling water groove is deepened, water flow resistance is reduced, water flow is increased, cooling water is strong in heat conduction capacity in two second cooling water groove parts, and the temperature of hot face contacted with molten steel is correspondingly reduced, and the tendency of hot face hot crack is reduced;Realize the interchange of copper plate up and down mouth;Solved the technical problem that the existing technology crystallizer copper plate high heat flow density area is prone to relatively deep hot crack, copper plate is repaired each time, and crack is milled, so that the repairable times of copper plate are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of continuous casting technology, and in particular to a crystallizer copper plate with an inverted top and bottom that can be repaired. Background Technology

[0002] The working surface of the copper plate in the crystallizer is usually coated with an electroplated layer, with a thickness of 0.2~0.5mm at the top and 1.2~1.5mm at the bottom. This design serves two purposes: firstly, to increase the wear resistance of the copper plate surface, especially the wear resistance and wear amount at the bottom, thereby extending the service life of the copper plate; secondly, the plating at the top prevents copper from seeping into the surface of the continuously cast billet and causing star-shaped cracks on the billet surface. Additionally, the upper part is required to have good thermal conductivity.

[0003] With the accelerated pace of continuous casting production, increasing the casting speed is the only way to meet the increased output requirements under the same billet cross-sectional specifications. However, this increased casting speed inevitably leads to a higher heat flux density transferred to the copper plate in the crystallizer. This significant increase in heat flux density causes the copper plate temperature to rise, especially in the meniscus region. The elevated temperature in the meniscus region generates greater internal stress. Furthermore, the crystallizer frequently requires shutdowns to change steel grades and cross-sections, resulting in frequent alternating heat and cold and alternating stress. This makes it easier for thermal cracks to form in the high heat flux density areas of the first and second rows of screw holes closest to the top of the plate. After each casting cycle, machining revealed that the thermal cracks penetrated 2-4 mm from the working surface towards the water-cooled surface. To reduce the possibility of deeper cracks after casting and to prevent excessively deep cracks, or even cracks penetrating the cooling water tank and causing significant safety hazards, the cracks are milled away each time the copper plate is repaired. However, this practice greatly reduces the number of times the copper plate can be repaired, increasing operating costs.

[0004] In view of the above, this utility model is hereby proposed. Utility Model Content

[0005] The purpose of this invention is to provide a crystallizer copper plate that can be repaired by reversing its top and bottom openings, in order to solve the technical problem in the prior art that deep thermal cracks are easily generated in the high heat flux density area of ​​the crystallizer copper plate, and the cracks must be milled away each time the copper plate is repaired, which greatly reduces the number of times the copper plate can be repaired.

[0006] In order to achieve the above-mentioned objectives of this utility model, the following technical solution is adopted: This utility model provides a crystallizer copper plate with an inverted and repairable top and bottom opening. The back of the crystallizer copper plate is provided with several rows of threaded holes, and several rows of cooling water tanks are provided between two adjacent rows of threaded holes. The cooling water tanks and threaded holes are symmetrically arranged with respect to the center line O between the top and bottom openings of the crystallizer copper plate. The cooling water tank includes a first cooling water tank, and two ends of the first cooling water tank are respectively provided with mutually symmetrical second cooling water tanks. The depth of the first cooling water tank is H1; the depth of the second cooling water tank is H2, where H2 < H1.

[0007] Furthermore, an arc transition r is provided between the end of the second cooling water tank away from the first cooling water tank and the back of the crystallizer copper plate.

[0008] Furthermore, the difference between H1 and H2 is 1~3mm; The depth H1 of the first cooling water tank is 13~16mm.

[0009] Furthermore, the straight section of the second cooling water tank has a length of 70~100mm.

[0010] Furthermore, the cooling water tank adjacent to each row of threaded holes is a deepened cooling water tank, which includes a first deepened cooling water tank and two symmetrical second deepened cooling water tanks at both ends of the first deepened cooling water tank. The depth of the first deepened cooling water tank is H11, where H11 > H1; The depth of the second deepened cooling water tank is H21, where H21 < H11.

[0011] Furthermore, the difference between H11 and H1 is 3~5mm.

[0012] Furthermore, the difference between H11 and H21 is 3~5mm.

[0013] Furthermore, H21 is 13~15mm.

[0014] Furthermore, an X-shaped water groove is provided between the first row of threaded holes and the second row of threaded holes at both ends of each column of threaded holes.

[0015] Furthermore, the depth of the X-shaped water tank is H3, where H3 is 13~15mm.

[0016] This utility model provides a crystallizer copper plate with reversible top and bottom openings for repair, where H2 < H1. The depth of the first cooling water tank is increased from the depth H2 of the second cooling water tank to the depth H1. The increased depth of the tank reduces water flow resistance and increases water flow rate. Under the same water flow rate, the flow velocity of the cooling water in the two second cooling water tank sections must be greater than that in the first cooling water tank section. The higher the flow velocity of the copper plate section, the less likely a vapor film will form on its heat exchange surface during heat exchange with water, resulting in lower thermal resistance, higher heat exchange efficiency, and stronger thermal conductivity. Consequently, the temperature of the hot surface in contact with molten steel will decrease, and the tendency for hot surface cracking will be reduced accordingly. The cooling water tank and threaded holes are symmetrically arranged around the center line O between the upper and lower openings of the crystallizer copper plate, allowing for the interchangeability of the upper and lower openings of the copper plate. This interchangeability allows for repairs where the upper and lower openings are reversed. Because of this reversal, the upper opening of the repaired copper plate uses the lower opening from the previous repair where the crack was less severe or non-existent. The previous lower opening was crack-free due to lower thermal stress. By reversing the lower opening of the previous copper plate to the upper opening of the current repair, the original thermal stress at the upper opening is reduced, preventing excessive stress accumulation and minimizing thermal cracking. This results in less material being removed during each repair, increasing the overall number of repairs and significantly reducing operating costs. This solves the technical problems of existing technologies where deep thermal cracks easily form in the high heat flux density area of ​​the crystallizer copper plate, requiring significant milling away of deep cracks during each repair, and limiting the number of repair cycles for the copper plate. Attached Figure Description To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A front view of the back of a crystallizer copper plate with inverted top and bottom openings for repair, provided in an embodiment of this utility model; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA; Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at point BB; Figure 4 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 5 for Figure 3 Enlarged structural diagram at point B; Figure 6 A schematic diagram of the X-shaped water tank structure provided for an embodiment of this utility model.

[0018] Icons: 1-Copper plate cooling surface; 2-Copper plate working surface; 11-Threaded hole; 12-First cooling water tank; 121-First deepened cooling water tank; 13-Second cooling water tank; 131-Second deepened cooling water tank; 14-Arch; 3-Upper opening; 4-Lower opening; 5-X-shaped water tank. Detailed Implementation

[0019] Unless otherwise defined herein, the scientific and technical terms used in connection with this utility model shall have the meanings commonly understood by one of ordinary skill in the art. The meaning and scope of terms shall be clear; however, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or foreign definitions. In this application, unless otherwise stated, the use of "or" means "and / or". Furthermore, the use of the term "comprising" and other forms is non-limiting.

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that the terms "proximal end," "distal end," "front end," "rear end," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] The terms "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] This utility model provides a crystallizer copper plate with an inverted and repairable top and bottom opening. The back side 1 of the crystallizer copper plate is provided with several rows of threaded holes 11, and several rows of cooling water tanks are provided between two adjacent rows of threaded holes 11. The cooling water tanks and threaded holes are symmetrically arranged with respect to the center line O between the top and bottom openings of the crystallizer copper plate. The cooling water tank includes a first cooling water tank 12, and two ends of the first cooling water tank 12 are respectively provided with mutually symmetrical second cooling water tanks 13. The depth of the first cooling water tank 12 is H1; the depth of the second cooling water tank 13 is H2, where H2 < H1.

[0027] H2 < H1, the depth of the first cooling water tank is increased from the depth H2 of the second cooling water tank to the depth H1. The increased depth reduces water flow resistance and increases water flow rate. Under the same water flow rate, the flow velocity of the cooling water at the two locations 13 of the second cooling water tank must be greater than the flow velocity at the location 12 of the first cooling water tank. The higher the flow velocity of the copper plate, the less likely a vapor film will form on its heat exchange surface during heat exchange with water, resulting in lower thermal resistance, higher heat exchange efficiency, and stronger thermal conductivity. Consequently, the temperature of the hot surface in contact with the molten steel will decrease, and the tendency for hot surface cracking will be reduced accordingly. The cooling water tank and threaded hole are... The center lines O between the upper and lower openings of the copper plate in the crystallizer are symmetrically set, allowing for the interchangeability of the upper and lower openings. This interchangeability enables the copper plate to be repaired by reversing the upper and lower openings. Because of this reversal, the upper opening of the repaired copper plate uses the lower opening from the previous repair where the crack was less severe or non-existent. The previous lower opening was crack-free due to lower thermal stress. By reversing the lower opening of the previous copper plate to the upper opening of the current one, the original thermal stress at the upper opening is reduced. This prevents excessive stress accumulation at the upper opening, resulting in smaller thermal cracks and less material removed during each repair. The total number of repairs is increased by at least two, significantly reducing operating costs. This solves the technical problems of existing technologies where deep thermal cracks easily form in the high heat flux density area of ​​the crystallizer copper plate, requiring milling away of deep cracks during each repair, and limiting the number of repairs possible for the copper plate.

[0028] In some specific embodiments, an arc 14 is provided between the end of the second cooling water tank 13 away from the first cooling water tank 12 and the back side 1 of the crystallizer copper plate for transition.

[0029] In some specific implementations, the difference between H1 and H2 is 1 to 3 mm. Specifically, the difference between H1 and H2 can be, but is not limited to, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3.0 mm, or any value between 1 and 3 mm.

[0030] In some specific embodiments, the depth H1 of the first cooling water tank 12 is 13~16mm. Specifically, H1 can be, but is not limited to, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 15.5mm or 16mm, or any value between 13 and 16mm.

[0031] In some specific embodiments, the length L of the straight section of the second cooling water tank 13 is 70~100mm. Specifically, the length L of the straight section of the second cooling water tank 13 can be, but is not limited to, 70mm, 75mm, 70mm, 75mm, 70mm, 75mm or 100mm, or any value between 70 and 100mm.

[0032] In some specific embodiments, the cooling water tank adjacent to each row of threaded holes 11 is a deepened cooling water tank. The deepened cooling water tank includes a first deepened cooling water tank 121, with symmetrical second deepened cooling water tanks 131 at both ends. The depth of the first deepened cooling water tank 121 is H11, where H11 > H1. In some specific embodiments, the depth of the second deepened cooling water tank 131 is H21, where H21 < H11.

[0033] The cooling water tanks on the left and right sides of each row of threaded holes 11 are set as deeper cooling water tanks because the distance between the cooling water tanks on the left and right sides of each row of threaded holes 11 is nearly twice the distance between other adjacent cooling water tanks. In order to make the cooling capacity of the cooling water tanks on the left and right sides of each row of threaded holes 11 similar to that of other parts, the cooling water tanks are set as deeper. Increasing their depth can increase their heat exchange area and help to improve the uniformity of overall heat exchange.

[0034] In some specific implementations, the difference between H11 and H1 is 3 to 5 mm. Specifically, the difference between H11 and H1 can be, but is not limited to, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, or 5 mm, or any value between 3 and 5 mm.

[0035] In some specific implementations, the difference between H11 and H21 is 3 to 5 mm. Specifically, the difference between H11 and H21 can be, but is not limited to, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, or 5 mm, or any value between 3 and 5 mm.

[0036] In some specific implementations, H21 is 13~15mm. Specifically, H21 can be, but is not limited to, 13mm, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.4mm, 14.6mm, 14.8mm or 15mm, or any value between 13 and 15mm.

[0037] In some specific embodiments, an X-shaped water groove 5 is provided between the first row of threaded holes and the second row of threaded holes at both ends of each row of threaded holes 11.

[0038] Setting up the X-shaped water tank 5 can make the high heat flux density area cool evenly, and the billet will be more uniform in the billet shell formation process, with less stress, thus improving the quality of the billet. At the same time, it makes the temperature distribution of the copper plate in the high temperature zone more uniform, and the cracks generated in the copper plate in the high temperature zone are smaller and shallower.

[0039] In some specific embodiments, the depth of the X-shaped water tank 5 is H3, which is 13~15mm. Specifically, H3 can be, but is not limited to, 13mm, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.4mm, 14.6mm, 14.8mm or 15mm, or any value between 13 and 15mm.

[0040] The present invention will be further illustrated below through embodiments. Unless otherwise specified, the materials in the embodiments are prepared according to existing methods or purchased directly from the market.

[0041] Example A crystallizer copper plate with an inverted top and bottom that can be repaired includes a working surface 2 of the copper plate and a cooling back surface 1 of the copper plate.

[0042] like Figure 1 , Figure 2 and Figure 4 As shown, the back side 1 of the copper plate cooling includes multiple rows of threaded holes 11 and multiple rows of cooling water tanks arranged between the multiple rows of threaded holes 11. The two ends of the first cooling water tank 12 are respectively provided with mutually symmetrical second cooling water tanks 13. One end of the second cooling water tank 13 is close to the upper opening 3, and the other end of the second cooling water tank 13 is close to the lower opening 4. The two second cooling water tanks 13 are symmetrically arranged about the center line O of the upper and lower openings of the copper plate, that is, the upper and lower openings of the copper plate can be interchanged. The depth of the first cooling water tank 12 is H1; the depth of the second cooling water tank 13 is H2, H1 is 15mm, H2 is 13mm, and H1-H2=2mm.

[0043] Near the top of the second cooling water tank 13 at position 3 and near the bottom of the second cooling water tank 13 at position 4, respectively, a r30 arc 14 is provided between the top and the back of the copper plate 1 of the crystallizer for transition. The straight section length L of the second cooling water tank 13 is 75mm.

[0044] like Figure 1 , Figure 3 , Figure 5 As shown, each of the multiple rows of threaded holes 11 has a deepened cooling water tank on each of its adjacent left and right sides. The depth of the deepened cooling water tank is different from the depth of the cooling water tanks not adjacent to the threaded holes 11. The deepened cooling water tank includes a first deepened cooling water tank 121, and two symmetrically arranged second deepened cooling water tanks 131 at both ends of the first deepened cooling water tank 121. The depth of the first deepened cooling water tank 121 is H11, where H11 > H1. The depth of the second deepened cooling water tank 131 is H21, where H21 < H11. Wherein, H11 is 18mm, H21 is 14mm, and FH1 - FH2 = 4mm.

[0045] like Figure 1 , Figure 6 As shown, on the back side 1 of the crystallizer copper plate, X-shaped water troughs 5 are provided between the first and second rows of threaded holes closest to the upper opening 3 in each column of threaded holes 11, and between the first and second rows of threaded holes closest to the lower opening 4 in each column of threaded holes 11; the depth of the X-shaped water troughs is the same as the depth H21 of the second deepened cooling water trough 131, which is 14mm.

[0046] Working principle: Firstly, when designing the copper plate for the crystallizer, the depth of the original copper plate water tank is increased by 1-5mm at the H1 position. Then, after the copper plate comes off the machine, the surface of the copper plate water tank is leveled. The upper edge before coming off the machine is used as the lower edge to be machined, and the lower edge before coming off the machine is used as the upper edge to be machined. Following the design of a 0.2-0.5mm upper edge and a 1.2-1.5mm lower edge plating, the entire plate is milled downwards until all cracks at the lower edge are removed. If there are no cracks at the lower edge, after milling the upper edge plating, the entire plate is milled downwards by another 1mm. If there are cracks at the lower edge, after milling the upper edge plating and then milling downwards by another 1mm, if the cracks are still not removed, the maximum depth of the crack can be kept to no more than 1mm; any excess should be completely removed. The subsequent electroplating and processing will not be detailed further. In this way, neither electroplating nor the safety of the copper plate is affected, and the crack at the bottom edge will not propagate. During the next repair, the crack can be milled off by adjusting the top and bottom edges. This can significantly increase the number of repairs for the copper plate, extend its lifespan, and reduce usage costs.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A crystallizer copper plate with reversible top and bottom openings for repair, characterized in that, The back (1) of the crystallizer copper plate is provided with several rows of threaded holes (11), and several rows of cooling water tanks are provided between two adjacent rows of threaded holes (11). The cooling water tanks and threaded holes are symmetrically arranged with respect to the center line O between the upper and lower openings of the crystallizer copper plate. The cooling water tank includes a first cooling water tank (12), and the two ends of the first cooling water tank (12) are respectively provided with mutually symmetrical second cooling water tanks (13). The depth of the first cooling water tank (12) is H1; the depth of the second cooling water tank (13) is H2, H2 < H1.

2. The crystallizer copper plate according to claim 1, characterized in that, An arc (14) is provided between the end of the second cooling water tank (13) away from the first cooling water tank (12) and the back of the copper plate of the crystallizer (1).

3. The crystallizer copper plate according to claim 2, characterized in that, The difference between H1 and H2 is 1~3mm; The depth H1 of the first cooling water tank (12) is 13~16mm.

4. The crystallizer copper plate according to claim 1, characterized in that, The length of the straight section of the second cooling water tank (13) is 70~100mm.

5. The crystallizer copper plate according to claim 1, characterized in that, The cooling water tank adjacent to each row of threaded holes (11) is a deepened cooling water tank, which includes a first deepened cooling water tank (121), and the two ends of the first deepened cooling water tank (121) are respectively provided with mutually symmetrical second deepened cooling water tanks (131). The depth of the first deepened cooling water tank (121) is H11, where H11 > H1; The depth of the second deepened cooling water tank (131) is H21, where H21 < H11.

6. The crystallizer copper plate according to claim 5, characterized in that, The difference between H11 and H1 is 3~5mm.

7. The crystallizer copper plate according to claim 5, characterized in that, The difference between H11 and H21 is 3~5mm.

8. The crystallizer copper plate according to claim 5, characterized in that, H21 is 13~15mm.

9. The crystallizer copper plate according to any one of claims 1 to 8, characterized in that, An X-shaped water groove (5) is provided between the first row of threaded holes and the second row of threaded holes at both ends of each row of threaded holes (11).

10. The crystallizer copper plate according to claim 9, characterized in that, The depth of the X-shaped water tank (5) is H3, where H3 is 13~15mm.

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