Arch-type straightening machine and billet continuous casting machine using the same for pressing down

Abstract

The present invention discloses a arch-type straightening machine. It comprises: an arch-type frame, at least two groups of straightening rollers, and a lifting drive mechanism. The arch-type frame comprises: a base, an upper frame, and multiple rows of column frames; each group of straightening rollers is located between two adjacent rows of column frames, including an upper straightening roller and a lower straightening roller; the lifting drive mechanism is installed on the upper frame, the number of which is the same as the number of straightening roller groups, a displacement sensor is installed on the upper part, and the lower part is connected to the upper straightening roller lifting frame; the upper straightening roller is rotatably installed in the upper straightening roller lifting frame, and the lower straightening roller is rotatably installed on the column frame; a slide rail is provided on the column frame facing the straightening roller side, and the lifting drive mechanism drives the upper straightening roller lifting frame to slide up and down in the slide rail. The present invention has an arch-type structure, is simple and compact, has good frame rigidity, has a stable guiding function, and accurately controls the amount of pressing down, thereby ensuring the quality of the ingot. The present invention also discloses a small square billet continuous casting machine that uses an arch-type straightening machine to press down.

Description

Technical Field

[0001] The invention relates to the technical field of continuous casting, in particular to a arch-type straightening machine and a small square billet continuous casting machine using the same for pressing down. Background Art

[0002] For small billet continuous casting machines that produce billets with a cross-sectional size of less than 200mm×200mm, when producing high-quality alloy steel and other steel types that have strict requirements on internal quality and compression ratio, it is necessary to strictly control the internal quality of the continuous casting billet, especially to control the center looseness and segregation indicators of the billet. Dynamic reduction technology is a method of applying a certain amount of reduction near the end of solidification to compensate for the solidification shrinkage of the billet and prevent the enrichment of segregation elements at the end of solidification, thereby reducing center looseness and segregation. The prerequisite for implementing dynamic reduction is that the small billet continuous casting machine needs to adopt a tension straightening machine that can press down at multiple points.

[0003] One of the key points in the implementation of dynamic reduction technology is to accurately determine the position of the end of solidification. The dynamic solidification model is usually used to instantly calculate the solidification end point of the ingot according to the actual operating conditions (such as steel grade, pulling speed, molten steel superheat, secondary cooling curve, etc.). The current experience is that the light reduction area is more suitable in the range of the solid phase ratio fs = 0.3 to 0.9 of the ingot. This is a larger range compared to the small square billet continuous casting machine to meet different steel grades, pulling speeds, molten steel superheat and other conditions. However, for a specific steel grade, pulling speed, superheat and other conditions, because the ingot cross-section is small, the length of the liquid phase zone that can be used for dynamic reduction is short, and more reduction rollers must be arranged within a limited range. In the prior art, the spacing between the pulling and straightening rollers is large, which cannot meet the parameter requirements for the reduction of the small square billet ingot. Summary of the invention

[0004] Based on the above problems, the object of the present invention is to provide a arch-type straightening machine with a compact structure, stable guiding function and precise control of the reduction amount. The straightening machine can realize the multi-location and multi-point reduction process of the small square billet continuous casting machine, reduce the central segregation and looseness of the small square billet, and improve the quality of the casting.

[0005] Another object of the present invention is to provide a small square billet continuous casting machine using the above-mentioned arch-type straightening machine and pressing down.

[0006] The above purpose is achieved through the following technical solutions:

[0007] According to one aspect of the present invention, the present invention provides an arch-type straightening machine, comprising: an arch-type frame, at least two groups of straightening rollers located in the arch-type frame, and a lifting drive mechanism located above the arch-type frame, wherein the arch-type frame comprises: a base, an upper frame installed at the upper end of the base, and multiple rows of column frames installed between the upper frame and the base; each group of straightening rollers is located between two adjacent rows of column frames, and each group of straightening rollers comprises an upper straightening roller and a lower straightening roller located below it; the lifting drive mechanism is installed on the upper frame, and the number is the same as the number of groups of straightening rollers, and a displacement sensor is installed on the upper part of the lifting drive mechanism, and an upper straightening roller lifting frame is connected to the lower part; wherein the upper straightening roller is rotatably installed in the upper straightening roller lifting frame, and the lower straightening roller is rotatably installed on two adjacent rows of column frames; a slide rail is provided on the column frame toward the straightening roller side, and the upper straightening roller lifting frame slides up and down in the slide rail through the drive of the lifting drive mechanism.

[0008] Preferably, at least four rows of column frames are arranged, and two adjacent groups of straightening rollers do not share a row of column frames.

[0009] More preferably, the straightening rollers are arranged in two groups, the column frames are arranged in four rows, the first group of straightening rollers is located between the first and second rows of column frames, and the second group of straightening rollers is located between the third and fourth rows of column frames.

[0010] Preferably, the distance between two adjacent sets of straightening rollers is 800 mm to 1200 mm.

[0011] Preferably, the straightening machine further comprises: a transmission device for driving the upper straightening roller to rotate; the transmission device comprises: a reducer connected to the end of the upper straightening roller, and a motor connected to the reducer.

[0012] Preferably, the straightening machine further comprises: a heat insulation cover, one heat insulation cover is provided for each group of straightening rollers, and is provided on the side of the column frame facing the straightening rollers.

[0013] Preferably, the column frame is a steel plate structure with a thickness of 40 to 90 mm and no water cooling. More preferably, each row includes two column frames. Preferably, a slide plate is provided on the inner side of the column frame (towards the side of the straightening roller) to form a slide rail for the upper straightening roller elevator to rise or fall.

[0014] Preferably, the base is provided with a cooling water channel of the tension and straightening machine which is automatically connected with the water channel of the workshop.

[0015] Preferably, the bottom of the column frame is connected to the base through bolts; and the top is connected to the upper frame through a connecting shaft.

[0016] According to another aspect of the present invention, the present invention provides a small square billet continuous casting machine that adopts the above-mentioned arch-type straightening machine and performs pressing, wherein the arch-type straightening machine can be arranged in one or more areas of the arc area, straightening area, and horizontal area in front of the pre-cutting roller of the small square billet continuous casting machine.

[0017] Preferably, the centers of the upper and lower straightening rollers of the arch-type straightening machine are arranged in the normal direction of the outer arc reference line of the small square billet.

[0018] Preferably, the billet continuous casting machine is equipped with 1 to 7 arch-type straightening machines.

[0019] Beneficial effects:

[0020] The arch-type straightening machine of the present invention adopts an integral arch-type frame structure, which is simple and compact, and is convenient for arranging more pressing rollers in a shorter liquid phase zone, meeting the parameter requirements of the pressing spacing of small square billet castings; the frame has good rigidity and can be used for the dynamic light pressing and heavy pressing technologies of the continuous casting machine; it has a stable guiding function; the pressing amount is accurately controlled; and the quality of the casting can be guaranteed.

[0021] Among them, the arch-type structure is formed by connecting the column frame, the upper frame, and the base, and the frame has good rigidity. The upper straightening roller moves radially under the drive of the lifting drive mechanism and the guidance of the column frame slide rail. Compared with the clamp-type structure in the prior art, it optimizes the force condition of the billet and ensures the pressing accuracy of the roller; it can realize the multi-point pressing process of the small square billet continuous casting machine; and reduce the center segregation and looseness of the small square billet. The lifting drive mechanism is provided with a displacement sensor, so that the pressing position and pressing amount of the upper straightening roller can be accurately controlled. Compared with the independent frame straightening machine, the integral structure is compact, the spacing between the upper straightening rollers is reduced, and more pressing rollers can be arranged in a shorter liquid phase region, meeting the parameter requirements of the pressing spacing of the small square billet. Compared with the multi-frame integral straightening machine, the two-roller integral structure of the present invention takes up a short time for the continuous casting machine to stop online, and the construction cost and maintenance cost are low.

[0022] The present invention adopts a small square billet continuous casting machine for pressing down by using a arch-type straightening machine, which has greater flexibility in the selection of the pressing down range, and meets the requirements of a wider range of different steel grades, drawing speeds, molten steel superheat and other conditions and different pressing down amounts, pressing down rates and other pressing down process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the arch type tension and straightening machine of the present invention;

[0024] Figure 2 yes Figure 1 Middle AA section view;

[0025] Figure 3The present invention is a schematic structural diagram of a small square billet continuous casting machine that adopts a arch-type straightening machine for pressing down. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention:

[0027] like Figure 1 As shown, the present invention provides a arch-type straightening machine, comprising: an arch-type frame, at least two groups of straightening rollers located in the arch-type frame, and a lifting drive mechanism located above the arch-type frame. Specifically, the straightening machine is composed of two groups of straightening rollers, four rows of column frames, an upper frame, two upper straightening roller movable frames, two lifting drive mechanisms (which can be hydraulic cylinders), two heat insulation covers, two reducers, two motors, a base, two displacement sensors (placed in the hydraulic cylinder) and other components.

[0028] Among them, the two groups of straightening rollers include two upper straightening rollers 1 and two lower straightening rollers 2, forming two pairs of upper and lower straightening rollers. There are four rows of column frames, each row includes two column frames 3, the first group of straightening rollers is located between the first and second rows of column frames, the second group of straightening rollers is located between the third and fourth rows of column frames, and the two adjacent groups of straightening rollers may not share a row of column frames, but are not limited to this. In the present invention, the base 10 below the two pairs of upper and lower straightening rollers is a whole, and the upper frame 4 above is also a whole. The second and third rows of column frames can be fixed by a fixing device, for example, they can be fixed by a connecting plate and bolts.

[0029] The center of each group of upper and lower straightening rollers is arranged on the normal line of the outer arc reference line of the small square billet. The arch frame includes: a base 10, an upper frame 4 installed on the upper end of the base, and multiple rows of column frames 3 installed between the upper frame and the base. Each group of straightening rollers is located between two adjacent rows of column frames, and each group of straightening rollers includes an upper straightening roller 1 and a lower straightening roller 2 located below it. The lifting drive mechanism 6 is installed on the upper frame 4, and the number is the same as the number of straightening rollers. The upper part of the lifting drive mechanism 6 is installed with a displacement sensor 11, and the lower part is connected with an upper straightening roller lifting frame 5. Among them, the upper straightening roller 1 is rotatably installed in the upper straightening roller lifting frame 5, and the lower straightening roller 2 is rotatably installed on the two adjacent rows of column frames; the column frame 3 is provided with a slide rail facing the side of the straightening roller (i.e., the inner side of the column frame), and the upper straightening roller lifting frame 5 slides up and down in the slide rail through the drive of the lifting drive mechanism 6. In the present invention, a lifting drive mechanism 6 is arranged corresponding to a group of straightening rollers; a group of straightening rollers is arranged in conjunction with two rows of column frames 3. Each row of column frames can be formed by one column frame, or by two or more column frames. The lifting drive mechanism 6 is on the same axis as the tension and straightening roller.

[0030] The present invention adopts an upper frame 4, a base 10 connected with a column frame 3 to form an independent integral arch-type structure, and places two sets of upper and lower drawing and straightening rollers therein to form a double-pair-roller integral arch-type drawing and straightening machine, which has a simple and compact structure, facilitates the arrangement of more pressing rollers in a shorter liquid phase region, and meets the parameter requirements of the pressing spacing of small square billet castings; and the arch-type frame has good rigidity, so that the drawing and straightening machine can be used for the dynamic light pressing and heavy pressing technology of the continuous casting machine. The present invention preferably adopts four rows of column frames 3 to place two sets of upper and lower drawing and straightening rollers, but is not limited to this, and multiple rows of column frames can also be used to place more sets of drawing and straightening rollers.

[0031] In an optional embodiment, the top of the column frame 3 and the upper frame 4, and the bottom of the column frame 3 and the base 10 can be movably installed and fixed, so that the spacing of the column frame 3 can be adjusted, which is convenient for setting the spacing of the upper straightening rollers, and the dynamic pressing process of the billet continuous casting machine can be completed as needed. For example, multiple mounting holes can be set on the upper frame 4, the column frame 3, and the base 10, and the spacing between the mounting holes can be set to complete the adjustment of the spacing of the upper straightening rollers. In the present invention, the upper frame 4 is connected to the four rows of two groups of column frames through eight connecting shafts; four waist-shaped holes are set at the bottom of the column frame, and the bottoms of the four rows of column frames are respectively connected and fixed to the base 10 by bolts to form an overall archway structure. In order to facilitate the installation, adjustment and positioning of the archway-type straightening machine, an adjustment block is set under the base. At the same time, the base 10 is also a channel for the cooling water of the straightening machine. After the straightening machine is in place, the cooling water channel of the equipment body is automatically connected to the water channel of the workshop, and the electrical terminal box and the aviation plug are connected to the workshop cable, which takes up a short time for the continuous casting machine to stop production online and has low maintenance costs. The arch-type straightening machine of the present invention has two groups of straightening rollers (the upper and lower straightening rollers constitute one group of straightening rollers), and the roller diameter can be 300-500 mm. Due to the use of the overall arch-type structure of the column frame, the roller spacing between two adjacent groups of straightening rollers along the billet drawing direction can be controlled to be 800 mm-1200 mm. This compact structure can arrange more pressing rollers in a shorter liquid phase zone, meeting the parameter requirements of the pressing spacing of small square billet castings.

[0032] In the present invention, the upper straightening roller 1 is a driving roller, the lower straightening roller 2 is a free roller, and the column frame adopts a steel plate structure, which further improves the rigidity of the arch-type frame. The lower straightening roller 2 is fixed to the mounting surface of the column frame 3 by the lower straightening roller bearing seat bolts. The column frame 2 can be 40 to 90 mm thick and has no water cooling. A slide plate is set on the inner side of the column frame 3 to form a slide rail for the upper straightening roller 1 to slide up and down. For example, a slide plate is set on the inner side of the first and second column frames to form a slide rail for the first group of straightening rollers; a slide plate is set on the inner side of the third and fourth column frames to form a slide rail for the second group of straightening rollers. The number of slide plates can be four, but not limited to this. The upper and lower straightening rollers rise or fall stably under the guidance of the slide rail. The length of the slide plate in each row of column frames can be set according to the range of motion of the upper straightening roller.

[0033] In the present invention, the lifting drive mechanism 6 can be a hydraulic cylinder, each hydraulic cylinder drives an upper straightening roller 1, and is located on the same axis. The hydraulic cylinder is equipped with a displacement sensor 11, which can accurately control the pressing amount of the upper straightening roller and dynamically adjust the roller gap, so as to ensure the quality of the casting. Among them, the flange of the hydraulic cylinder is fixed to the hydraulic cylinder support by bolts, and the hydraulic cylinder support is connected to the upper frame by a connecting shaft. The piston rod of the hydraulic cylinder is hinged to the upper straightening roller lifting frame 5, specifically, the earring of the piston rod head of the hydraulic cylinder is hinged to the upper straightening roller movable frame. The upper straightening roller 1 is fixed in the upper straightening roller movable frame 5, and under the drive of the lifting drive mechanism 6, it moves radially in the slide rail inside the column frame 3 together with the upper straightening roller movable frame 5, so that the upper straightening roller 1 is guided more stably and the force is more uniform, further ensuring the pressing accuracy of the upper straightening roller 1.

[0034] like Figure 2 As shown, a reducer 8 is directly suspended at the end of the upper straightening roller, and a motor 9 is connected above the reducer 8. The reducer 8 and the motor 9 together constitute a transmission device of the upper straightening roller 1 to transmit its rotation. A heat insulation cover 7 is also provided in the arch frame, which may be two, located in the first and second rows of column frames and in the third and fourth rows of column frames, respectively, and installed on the inner side of the column frame to provide heat insulation protection for the main equipment of the straightening machine. Preferably, the heat insulation cover 7 can be a water tank type water cooling cover.

[0035] The small square billet continuous casting machine provided by the present invention, which adopts the above-mentioned arch-type straightening machine for pressing down, is suitable for producing small square billets with a cross-section of 120mm to 200mm for continuous casting. 1 to 7 arch-type straightening machines can be arranged. The arch-type straightening machine can be arranged at multiple positions of the small square billet continuous casting machine according to different steel grades, pulling speeds, molten steel superheat and other conditions and reasonable pressing processes such as pressing down amount and pressing down rate, such as behind the end electromagnetic stirring, the straightening area of ​​the billet, below the ingot rod storage, and the front of the pre-cutting roller. The centers of the upper and lower straightening rollers of the arch-type straightening machine are arranged in the normal direction of the outer arc reference line of the small square billet.

[0036] like Figure 3 As shown, the arch-type straightening machine can be arranged in the arc area of ​​the billet continuous casting machine. If the billet continuous casting machine is equipped with an end electromagnetic stirring system, the straightening machine is arranged within 3m of the end electromagnetic stirring coil of the line; if the end electromagnetic stirring system is not configured. The straightening machine is arranged in the area 6 to 15 meters away from the meniscus of the crystallizer. The arch-type straightening machine can be arranged in the straightening area of ​​the billet continuous casting machine, and 1 to 3 arch-type straightening machines can be arranged. The arch-type straightening machine can be arranged in the horizontal area in front of the pre-cutting roller of the billet continuous casting machine, and 1 to 3 arch-type straightening machines can be arranged.

[0037] The preferred embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which belong to the scope of protection of the present invention.

Claims

1. A arch-type tensioning and straightening machine, characterized in that: include: The arch-shaped frame, two sets of straightening rollers located inside the arch-shaped frame, and a lifting drive mechanism located above the arch-shaped frame, The archway frame includes: a base, an upper frame installed on the upper end of the base, and four rows of column frames installed between the upper frame and the base; and a plurality of mounting holes are arranged on the upper frame, the column frames and the base, and the top of the column frames and the upper frame and the bottom of the column frames and the base are movably mounted and fixed, so that the spacing between the column frames can be adjusted; wherein, the roller diameter of the straightening roller is 300-500mm, and the spacing between two adjacent groups of straightening rollers is 800mm-1200mm; each group of straightening rollers is located between two adjacent rows of column frames, and the two adjacent groups of straightening rollers do not share a row of column frames, and each group of straightening rollers includes an upper straightening roller and a lower straightening roller located below it; The lifting drive mechanism is installed on the upper frame, and the number is the same as the number of groups of straightening rollers. A displacement sensor is installed on the upper part of the lifting drive mechanism, and an upper straightening roller lifting frame is connected to the lower part; wherein, the upper straightening roller is rotatably installed in the upper straightening roller lifting frame, and the lower straightening roller is rotatably installed on two adjacent rows of column frames; a slide rail is provided on the column frame facing the straightening roller side; the upper straightening roller lifting frame slides up and down in the slide rail through the drive of the lifting drive mechanism.

2. The arch-type tensioning and straightening machine according to claim 1, characterized in that: Also includes: The transmission device is used to drive the upper pull straightening roller to rotate; the transmission device includes: a reducer connected to the end of the upper pull straightening roller, and a motor connected to the reducer.

3. The arch-type tensioning and straightening machine according to claim 1, characterized in that: Also includes: A heat insulation cover is provided for each set of straightening rollers and is arranged on the side of the column frame facing the straightening rollers.

4. The arch-type tensioning and straightening machine according to claim 1, characterized in that: The column frame is a steel plate structure with a thickness of 40 to 90 mm and no water cooling.

5. The arch-type tensioning and straightening machine according to claim 1, characterized in that: The bottom of the column frame is connected to the base through bolts; the top is connected to the upper frame through a connecting shaft.

6. A billet continuous casting machine using the arch-type straightening machine as claimed in any one of claims 1 to 5 for pressing down, characterized in that: The arch-type straightening machine is arranged in one or more areas of the arc area, the straightening area, and the horizontal area in front of the pre-cutting roller of the small square billet continuous casting machine.

7. The billet continuous casting machine according to claim 6, characterized in that: The centers of the upper and lower straightening rollers of the arch-type straightening machine are arranged in the normal direction of the outer arc reference line of the small square billet.

8. The billet continuous casting machine according to claim 6, characterized in that: The billet continuous casting machine is provided with 1 to 7 arch-type straightening machines.

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