Heavy-pressure stepped roller of thick plate casting machine

Abstract

The utility model discloses a heavy-pressure lower step roller of a thick plate casting machine, which belongs to the technical field of steel equipment and comprises a continuous casting machine body, a plurality of lower conveying roller components are arranged above the continuous casting machine body, pressing oil cylinders are arranged on two sides of the continuous casting machine body, and pressing roller ways are arranged on the upper portions of telescopic ends of the pressing oil cylinders. A plurality of upper compression roller assemblies are arranged on the lower compression roller way and communicated with cooling water assemblies, the pressure applied by the compression roller assemblies to a casting blank can be accurately controlled through the action of a lower compression oil cylinder, so that the casting blank is uniformly pressed, and the upper compression roller assemblies can enable the casting to be in a pasty area to be quickly cured and shaped; the rolling reduction is increased, meanwhile, the rolling reduction efficiency is improved, the final shape and size of a casting are more uniform, the larger rolling reduction and rolling reduction efficiency can be achieved for the solidification tail end, casting blank rolling reduction distribution is more reasonable, the equipment rolling reduction efficiency can be improved, and the service life of the equipment can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel equipment, in particular to a heavy-pressure stepped roller of a thick plate casting machine. Background Art

[0002] As the demand for thick plate steel plates becomes higher and higher, the cross-section of continuous casting billets is also required to develop towards larger cross-sections. During the continuous casting production process, due to the long two-phase zone and large solidification shrinkage brought about by the large cross-section, there will be certain central segregation and central porosity in the production process of thick plate billets, which seriously affect the internal quality of the billets and thus affect the performance requirements of the subsequent rolling process.

[0003] Currently, in thick plate continuous casting, heavy pressure is usually applied to the solidification end of the ingot to force the molten steel rich in solute elements at the end to discharge from the solidification end, thereby improving the center segregation and center looseness. However, as the thickness of the ingot increases, the pressing effect under heavy pressure is difficult to be transmitted to the center, so the effect on improving the internal quality of the ingot is limited. Utility Model Content

[0004] The purpose of the present utility model is to provide a heavy-pressure stepped roller for a thick plate casting machine, so as to solve at least one aspect of the problems and defects raised in the above-mentioned background technology.

[0005] A heavy-pressure lower stepped roller for a thick plate casting machine is provided, comprising a continuous casting machine body, a plurality of lower conveying roller assemblies are arranged above the continuous casting machine body, downward pressure oil cylinders are arranged on both sides of the continuous casting machine body, a downward pressure roller is arranged on the upper part of the telescopic end of the downward pressure oil cylinder, a plurality of upper pressure roller assemblies are arranged on the lower pressure roller, and a cooling water assembly is connected to the plurality of upper pressure roller assemblies.

[0006] Furthermore, the lower conveying roller assembly includes two lower bearing seats, which are symmetrically arranged above the continuous casting machine body. A conveying roller is rotatably connected between the two lower bearing seats. The main function of the conveying roller is to carry the cast embryo and move along the length direction of the continuous casting machine body to convey the cast embryo from the molten state to the pressing area. Due to the symmetrical arrangement of the conveying roller, the cast embryo can remain stable during the conveying process, reducing damage or shape deformation of the cast embryo caused by unstable conveying.

[0007] Furthermore, the upper pressing roller assembly includes two upper bearing seats, and the two upper bearing seats are symmetrically arranged above the lower pressing roller. A lower pressing stepped roller is arranged between the two upper bearing seats. The lower pressing stepped roller cooperates with the lower conveying roller to gradually apply appropriate pressure according to the different thicknesses and states of the castings. The stepped design makes the pressing process more refined and prevents the castings from being subjected to uneven force during the solidification process. The structure of the lower pressing stepped roller allows the pressing roller to press the castings in stages and multiple levels, applying different pressures in the pasty zone and the solid zone to ensure the gradual and uniform solidification of the castings and improve the structural integrity and quality of the final castings.

[0008] Furthermore, the step-down pressure roller comprises two flat roller shafts and a stepped roller body. The two flat roller shafts are fixedly connected above the upper bearing seat, with the stepped roller body positioned between them. The two flat roller shafts serve as the support structure for the stepped roller body, ensuring smooth operation of the entire roller body. The stepped roller body applies pressure in stages according to the thickness and solidification state of the embryo. This design ensures that the embryo receives appropriate pressing force at each stage of the solidification process, ensuring its shape and quality. Since the mushy zone is critical for embryo quality control, the multi-level pressure applied by the stepped roller body helps control the shape and internal structure of the embryo in this area, avoiding quality defects caused by the different solidification rates of the inner and outer layers. This effectively reduces deformation or internal defects that may occur during the pressing process. The distribution of pressing force at different stages prevents excessive stress in localized areas of the embryo under a single pressure, helping to improve the overall quality of the casting.

[0009] Furthermore, the stepped roller body is composed of two edge flat roller areas, an arc transition area and a flat roller pressing area. The two edge flat roller areas are arranged on the flat roller shaft. The edge flat roller area is connected to the flat roller pressing area through the arc transition area. The flat roller pressing area is arranged between the two edge flat roller areas to reduce stress concentration. During the suppression process of the casting, the increased pressure change may cause internal stress concentration, first leading to cracks or deformation. By setting an α angle of 15°-30°, the pressure can be transitioned from the edge to the middle, effectively reducing the stress concentration in the transition area, and preventing the casting from having defects such as deformation or cracks during the pressurization process. When the thickness change of the casting increases, the increased α angle (such as close to 15°) can help the transition area adapt to the change in the thickness of the casting and maintain the suppression effect without concentration or deformation. For castings with smaller thickness changes or higher precision requirements, a smaller α angle (such as 5°) can provide a precise and smaller transition.

[0010] Furthermore, the cooling water assembly includes a cooling main pipe, which is connected to a number of downward-pressing step rollers through a number of cooling branches. The cooling water passes through the cooling main pipe and the cooling branches, then passes through the bearing seat, and finally enters the downward-pressing step roller, taking away the heat borne by the contact with the high-temperature ingot, and then returns from the other side of the downward-pressing step roller and returns to the cooling main pipe step by step for circulation, which can effectively reduce the additional damage caused by thermal deformation of the downward-pressing step roller and improve its service life.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The core structure of this equipment is a downward pressure cylinder that drives the lower pressure roller, which in turn drives multiple upper pressure roller assemblies to press the casting. The upper pressure roller assembly is responsible for compacting the casting and reducing its mushy state. The key to this pressing process lies in controlling the shape distribution of the sparse mushy area of ​​the casting to achieve more uniform solidification of the casting. The action of the downward pressure cylinder can precisely control the pressure applied by the pressure roller assembly on the casting, thereby achieving uniform pressing of the casting. The upper pressure roller assembly can quickly solidify and shape the casting in the mushy area. This pressing method increases the amount of reduction and improves the reduction efficiency, making the final shape and size of the casting more uniform. It can achieve greater reduction and efficiency at the end of solidification, and the billet reduction distribution is more reasonable, which can improve the reduction efficiency and service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the overall side view of the heavy-pressure stepped roller of a thick plate casting machine;

[0015] Figure 2 Provides a schematic diagram of the overall front view cross-sectional structure of the utility model;

[0016] Figure 3 The utility model provides a schematic diagram of the stepped roller structure.

[0017] In the figure: 1. Continuous casting machine body; 2. Lower conveyor roller assembly; 21. Lower bearing seat; 22. Conveyor roller; 3. Down-pressure cylinder; 4. Down-pressure roller; 5. Upper pressure roller assembly; 51. Upper bearing seat; 6. Cooling water assembly; 61. Cooling main pipe; 62. Cooling branch pipe; 7. Down-pressure stepped roller; 71. Flat roller shaft; 72. Stepped roller body; 721. Edge flat roller area; 722. Arc transition area; 723. Flat roller down-pressure area. DETAILED DESCRIPTION

[0018] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0019] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0020] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations.

[0023] 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 represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-3As shown in the figure, in one embodiment of the present invention, a heavy-pressure stepped roller system for a thick plate casting machine comprises a continuous casting machine body 1, with a plurality of lower conveying roller assemblies 2 disposed above the continuous casting machine body 1, and downward pressure cylinders 3 disposed on both sides of the continuous casting machine body 1. A downward pressure roller 4 is disposed above the telescopic end of the downward pressure cylinder 3, and a plurality of upper pressure roller assemblies 5 are disposed on the lower pressure roller 4. Each of the plurality of upper pressure roller assemblies 5 is connected to a cooling water assembly 6. Driven by the downward pressure cylinder 3, the lower pressure roller 4 drives the upper pressure roller assemblies 5 to press the cast embryo. The upper pressure roller assemblies 5 are responsible for pressing the cast embryo tightly. During the pressing process, the cast embryo undergoes a transition zone from liquid to solid, known as the mushy zone. The shape distribution of this zone directly affects the final quality of the casting. By precisely controlling the pressure of the upper pressure roller assemblies 5, the shape distribution of the cast embryo in the mushy zone can be optimized, resulting in a more uniform solidification of the casting. The action of the downward pressure cylinder can precisely control the pressure applied by the pressure roller assemblies on the cast embryo. This precise pressure control is the key to achieving uniform pressing of the casting. By applying pressure in the mushy area, the casting can be quickly solidified and shaped. This not only speeds up the pressing process, but also improves the pressing efficiency, increasing the pressing amount without sacrificing efficiency. By optimizing the pressing process, the final shape and size of the casting are more uniform.

[0025] In one embodiment, see Figure 1 and Figure 2 As shown, the lower conveying roller assembly 2 includes two lower bearing seats 21, which are symmetrically arranged above the continuous casting machine body 1. A conveying roller 22 is rotatably connected between the two lower bearing seats 21. The main function of the conveying roller 22 is to carry the cast embryo and move along the length direction of the continuous casting machine body 1 to convey the cast embryo from a molten state to a pressing area. Due to the symmetrical arrangement of the conveying roller 22, the cast embryo can remain stable during the conveying process, reducing damage or shape deformation of the cast embryo caused by unstable conveying.

[0026] In one embodiment, see Figure 1 and Figure 2 As shown, the upper pressing roller assembly 5 includes two upper bearing seats 51, which are symmetrically arranged above the lower pressing roller 4. A lower pressing stepped roller 7 is disposed between the two upper bearing seats 51. The lower pressing stepped roller 7 cooperates with the conveyor roller 22 to gradually apply appropriate pressure according to the different thicknesses and conditions of the casting. The stepped design makes the pressing process more precise and prevents uneven force on the casting during solidification. The structure of the lower pressing stepped roller 7 allows the roller to press the casting in stages and multiple levels, applying different pressures in the mushy and solid zones, ensuring the gradual and uniform solidification of the casting and improving the structural integrity and quality of the final casting. The segmented pressure design of the lower pressing stepped roller 7 helps reduce stress concentration within the casting and avoid internal defects such as cracks or pores caused by rapid solidification or uneven pressing.

[0027] In one embodiment, see Figure 1 and Figure 3 As shown, the downward pressure stepped roller 7 includes two flat roller shafts 71 and a stepped roller body 72. The two flat roller shafts 71 are fixedly connected above the upper bearing seat 51. A stepped roller body 72 is arranged between the two flat roller shafts 71. The two flat roller shafts 71 serve as the support structure of the stepped roller body 72 to ensure that the entire stepped roller body 72 can run smoothly. The stepped roller body 72 applies pressure in stages according to the different thicknesses and solidification states of the castings. The castings can obtain appropriate pressing force at each stage of the solidification process to ensure their shape and quality. Since the mushy area is the key to controlling the quality of the castings, the multi-level pressure of the stepped roller body 72 can help control the shape and internal structure of the castings in this area, avoiding quality defects caused by different solidification speeds of the inner and outer layers. The stepped roller body 72 can effectively reduce the deformation or internal defects that may occur in the castings during the pressing process. The distribution of pressing force at different stages can avoid the phenomenon of excessive stress in local areas of the castings under a single pressure, which helps to improve the overall quality of the castings.

[0028] In one embodiment, see Figure 1 and Figure 3 As shown, the stepped roller body 72 consists of two edge flat roller sections 721, a circular arc transition section 722, and a flat roller pressure section 723. The two edge flat roller sections 721 are arranged on the flat roller shaft 71. The edge flat roller sections 721 are connected to the flat roller pressure section 723 through the circular arc transition section 722. The flat roller pressure section 723 is arranged between the two edge flat roller sections 721. The edge flat roller sections 721 are located at both ends of the flat roller shaft 71 and initially contact and apply pressure to the embryo. This section plays an initial role in pressing and also provides balance and stability for the entire roller body, ensuring accurate positioning and uniform pressure distribution of the embryo during the subsequent pressing process. The arc transition section 722, through its curved design, achieves pressure transition between the two edge flat roller sections 721 and the central flat roller pressure section 723. Pressure can be smoothly transferred from the edges to the core of the embryo, avoiding deformation or quality defects of the embryo caused by excessive pressure concentration or sudden changes.

[0029] In one embodiment, see Figure 1 and Figure 2As shown, the angle α between the arc transition zone 722 and the edge flat roller zone 721 is 5°-15°. This reduces stress concentration during the suppression process. Increased pressure changes can trigger internal stress concentration, leading to cracks or deformation. Setting an α angle of 15°-30° allows pressure to transition from the edge to the center, effectively reducing stress concentration in the transition zone and preventing defects such as deformation or cracks during the pressurization process. As the thickness of the casting increases, increasing the α angle (e.g., approaching 15°) helps the transition zone adapt to the thickness change and maintain the suppression effect without causing stress concentration or deformation. For castings with smaller thickness variations or higher precision requirements, a smaller α angle (e.g., 5°) can provide a more precise and smaller transition.

[0030] In one embodiment, see Figure 1 and Figure 2 As shown, the cooling water assembly 6 includes a cooling main pipe 61, which is installed on the lower roller table 4. The cooling main pipe 61 is connected to the plurality of lower step rollers 7 through a plurality of cooling branches 62. The cooling water passes through the cooling main pipe 61 and the cooling branches 62, then passes through the upper bearing seat 51, and finally enters the lower step roller 7, removing the heat borne by the high-temperature casting. The water then returns from the other side of the lower step roller 7 and gradually returns to the cooling main pipe 61 for circulation. This can effectively reduce the additional damage caused by thermal deformation of the lower step roller 7 and extend its service life.

[0031] The above content is merely an example and explanation of the structure of the present utility model. Technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the scope of protection of the present utility model.

Claims

1. A heavy-pressure stepped roller for a thick plate casting machine, comprising a continuous casting machine body (1), characterized in that: A plurality of lower conveying roller assemblies (2) are arranged above the continuous casting machine body (1), downward pressure cylinders (3) are arranged on both sides of the continuous casting machine body (1), a downward pressure roller (4) is arranged on the upper part of the telescopic end of the downward pressure cylinder (3), and a plurality of upper pressure roller assemblies (5) are arranged on the lower pressure roller (4), and the plurality of upper pressure roller assemblies (5) are connected to a cooling water assembly (6).

2. The heavy-plate casting machine step roller according to claim 1, characterized in that: The lower conveying roller assembly (2) comprises two lower bearing seats (21), the two lower bearing seats (21) are symmetrically arranged above the continuous casting machine body (1), and a conveying roller (22) is rotatably connected between the two lower bearing seats (21).

3. The heavy-pressure stepped roller of a thick plate casting machine according to claim 2, characterized in that: The upper pressure roller assembly (5) comprises two upper bearing seats (51), the two upper bearing seats (51) are symmetrically arranged above the lower pressure roller (4), and a lower pressure stepped roller (7) is arranged between the two upper bearing seats (51).

4. The heavy-pressure stepped roller of a thick plate casting machine according to claim 3, characterized in that: The downward pressure stepped roller (7) comprises two flat roller shafts (71) and a stepped roller body (72). The two flat roller shafts (71) are fixedly connected above the upper bearing seat (51), and the stepped roller body (72) is arranged between the two flat roller shafts (71).

5. The heavy-pressure stepped roller of a thick plate casting machine according to claim 4, characterized in that: The stepped roller body (72) is composed of two edge flat roller areas (721), a circular arc transition area (722) and a flat roller pressing area (723). The two edge flat roller areas (721) are arranged on the flat roller shaft (71). The edge flat roller area (721) is connected to the flat roller pressing area (723) through the circular arc transition area (722). The flat roller pressing area (723) is arranged between the two edge flat roller areas (721).

6. The heavy-pressure stepped roller of a thick plate casting machine according to claim 5, characterized in that: The included angle between the arc transition zone (722) and the edge flat roller zone (721) is α, and α is 15°-30°.

7. The heavy-plate casting machine step roller according to claim 4, characterized in that: The cooling water assembly (6) includes a cooling main pipe (61), which is arranged on the lower pressing roller (4). The cooling main pipe (61) is connected to a plurality of lower pressing stepped rollers (7) through a plurality of cooling branch pipes (62).

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