Large-pressure fan-shaped section device and control method thereof

Abstract

The invention provides a large-reduction fan-shaped section device and a control method thereof.The large-reduction fan-shaped section device comprises a fan-shaped section frame, an outer arc roller and a reduction assembly, the outer arc roller and the reduction assembly are both arranged on the fan-shaped section frame, and the reduction assembly is located above the outer arc roller; the pressing-down assembly comprises a base, an inner arc roller and at least three hydraulic cylinders, the at least three hydraulic cylinders are arranged in the width direction of the casting blank at intervals, cylinder bodies of the hydraulic cylinders are connected with the top of the fan-shaped section frame, piston cylinders of the hydraulic cylinders vertically extend downwards and are connected with the top of the base, and the inner arc roller is arranged at the bottom of the base. And the inner arc roller and the outer arc roller are vertically opposite to each other, so that a casting blank passing through the inner arc roller and the outer arc roller is pressed down through the cooperation of the inner arc roller and the outer arc roller. The technical problem that the internal quality of the casting blank after the thickness is increased cannot be guaranteed due to the fact that the pressing amount of the fan-shaped section of the continuous casting machine on the casting blank is limited is solved.

Description

Technical Field

[0001] This invention relates to the field of continuous casting technology in steelmaking production, and particularly to a large-reduction sector segment device and its control method. Background Technology

[0002] With rapid economic development and the increasing number of super high-rise and large-span steel structure construction projects, the demand for thick steel plates in the machinery and construction sectors is also growing, leading to increasingly stringent requirements for plate thickness and performance. Therefore, to meet market demands, the thickness of continuously cast billets is gradually increasing. Currently, straight-arc continuous casting machines can produce billets with a thickness of up to 460mm and a width of 2600mm to 2700mm. However, for the steel plate itself, the greater the billet thickness, the greater the risk of internal quality deterioration. Improving the internal quality of the billet mainly employs light and heavy reduction techniques, achieved through the sector section of the continuous casting machine. Currently, as the billet thickness continues to increase, the reduction required during production is also increasing. However, the current structure and control methods of the sector section limit the ability to achieve greater pressure, thus failing to guarantee the quality requirements of thicker billets.

[0003] Specifically, at present, most manufacturers use a conventional frame structure with four clamping cylinders, such as... Figure 1 As shown, a typical sector segment has 5 or 7 clamping rollers 10, which are pressed down by four hydraulic cylinders 20 arranged at the four corners of the frame 30. Due to the limitations of the frame 30's own structure (the diameter of the hydraulic cylinders 20 is limited), the maximum pressing force of a single existing sector segment is 2400t. This can meet the pressing amount of 8mm to 10mm for a 450mm thick billet. However, for thicker billets, the increased thickness and lower temperature will increase the resistance and reduce the amount of pressing that can be implemented. Therefore, the existing sector segments cannot meet the quality requirements of thicker billets.

[0004] In terms of related technologies, the current continuous casting machine's sector section has limited downward pressure on the billet, which cannot guarantee the internal quality of the billet after the thickness is increased.

[0005] Therefore, this invention proposes a large-scale compressed sector segment device and its control method to overcome the shortcomings of the prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a large-scale pressing sector segment device and its control method. By improving the pressing structure, it is possible to achieve large-scale pressing operations on ultra-thick slabs, ensuring the internal quality of the slab after the thickness is increased.

[0007] The objective of this invention can be achieved through the following methods: The application provides a large reduction fan segment device for performing reduction work on a casting blank, which comprises: a fan segment frame; an outer arc roller arranged on the fan segment frame; a reduction assembly arranged on the fan segment frame and located above the outer arc roller; wherein the reduction assembly comprises a base, an inner arc roller and at least three hydraulic cylinders, the at least three hydraulic cylinders are arranged at intervals along the width direction of the casting blank, the cylinder bodies of the hydraulic cylinders are connected with the top of the fan segment frame, the piston rods of the hydraulic cylinders are vertically downwardly extended and connected with the top of the base, the inner arc roller is arranged at the bottom of the base, and the inner arc roller is vertically opposite to the outer arc roller to perform reduction work on the casting blank passing between the inner arc roller and the outer arc roller.

[0008] In a preferred embodiment of the application, the number of the hydraulic cylinders is three, and along the width direction of the casting blank, the three hydraulic cylinders are respectively a first hydraulic cylinder, a second hydraulic cylinder and a third hydraulic cylinder located between the first hydraulic cylinder and the second hydraulic cylinder, displacement sensors are arranged on the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder respectively to detect the extension and retraction amount of the piston rod corresponding to the hydraulic cylinder. The first hydraulic cylinder and the second hydraulic cylinder are hydraulic cylinders driven to press downward, and the third hydraulic cylinder is a hydraulic cylinder capable of being switched between following and driving to press downward.

[0009] In a preferred embodiment of the application, the number of the outer arc rollers and the number of the reduction assemblies are both multiple, the multiple outer arc rollers and the multiple reduction assemblies are continuously arranged along the length direction of the casting blank, and the multiple outer arc rollers and the multiple reduction assemblies vertically correspond to each other.

[0010] In a preferred embodiment of the application, among the multiple inner arc rollers and the multiple outer arc rollers, at least two groups of opposite inner arc rollers and outer arc rollers are driving rollers, and the remaining inner arc rollers and outer arc rollers are free rollers.

[0011] In a preferred embodiment of the application, the fan segment frame comprises an upper frame and a lower frame arranged in a horizontal direction, the upper frame is located below the lower frame, and the upper frame and the lower frame are connected through a stand column; the reduction assembly is arranged on the bottom surface of the upper frame, and the outer arc roller is arranged on the top surface of the lower frame.

[0012] In a preferred embodiment of the present application, the inner arc roller comprises a plurality of inner arc roller bodies, and a plurality of first mounting seats are arranged on the top surface of the lower frame along the width direction of the casting blank, and the plurality of inner arc roller bodies are rotatably arranged between adjacent two first mounting seats to form a plurality of roller structures.

[0013] In a preferred embodiment of the present application, the outer arc roller comprises a plurality of outer arc roller bodies, and a plurality of second mounting seats are arranged on the bottom of the base along the width direction of the casting blank, and the plurality of outer arc roller bodies are rotatably arranged between adjacent two second mounting seats to form a plurality of roller structures.

[0014] The present application provides a control method of large reduction fan-shaped segment, which is implemented by using the large reduction fan-shaped segment device described above, and the control method comprises the following steps: Step S1: the hydraulic cylinder receives a downward action instruction; Step S2: among the three hydraulic cylinders, the first hydraulic cylinder and the second hydraulic cylinder drive the inner arc roller to move downward, and the third hydraulic cylinder follows without exerting pressure; Step S3: the pressure values exerted on the casting blank by the first hydraulic cylinder and the second hydraulic cylinder are obtained in real time, and if the pressure values exerted on the casting blank by the first hydraulic cylinder and the second hydraulic cylinder both exceed the upper limit of the preset pressure value, the third hydraulic cylinder actively exerts pressure on the casting blank; Step S4: the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder cooperatively perform the reduction operation on the casting blank until the casting blank reaches the preset reduction amount; Step S5: the third hydraulic cylinder changes from active pressure exertion to following, the first hydraulic cylinder and the second hydraulic cylinder drive the third hydraulic cylinder to move upward, and the inner arc roller moves upward to separate from the casting blank.

[0015] In a preferred embodiment of the present application, the step S3 comprises obtaining the pressure value exerted on the casting blank by the third hydraulic cylinder, wherein the pressure value K exerted by the third hydraulic cylinder satisfies the following condition: ; wherein, K1 is the pressure value exerted by the first hydraulic cylinder, K2 is the pressure value exerted by the second hydraulic cylinder, K3 is a displacement adjustment coefficient.

[0016] In a preferred embodiment of the present application, if the downward distance of the third hydraulic cylinder satisfies <0.5m, then K3 is 0; if the downward distance of the third hydraulic cylinder satisfies ≥0.5m, then it satisfies ; in, The downward pressing distance of the third hydraulic cylinder. This is the preset final pressing position for the cast billet.

[0017] In a preferred embodiment of the present invention, in step S5, if the pressure values ​​applied to the billet by the first hydraulic cylinder and the second hydraulic cylinder are both lower than the lower limit of the preset pressure threshold, then the third hydraulic cylinder changes from actively applying pressure to following up.

[0018] As described above, the features and advantages of the large-short-segment pressing device and its control method of the present invention are: The fan-shaped frame is equipped with pressing components and outer arc rollers arranged vertically. The inner arc roller and outer arc roller in the pressing components are vertically opposite each other. In actual operation, the pressing components adjust the force applied to the inner arc roller through at least three hydraulic cylinders. Based on the real-time pressure value applied to the billet by two of the hydraulic cylinders, the third hydraulic cylinder can be adjusted to actively or passively press down, thereby matching different pressing forces to the inner arc roller. Through the cooperation of the inner and outer arc rollers, the billet passing between them can be pressed down, ensuring that the billet reaches the preset pressing amount. This meets the requirements for large pressing operations on ultra-thick billets, and can still ensure the internal quality of the billet when pressing down billets with increased thickness. Attached Figure Description

[0019] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein: Figure 1 This is a schematic diagram of the structure of a sector segment in the prior art; Figure 2 This is a side view of the large-short-segment pressing device of the present invention; Figure 3 This is a front view of the large-pressure sector segment device of the present invention; Figure 4 This is a side view of the sector segment frame in the large-pressure sector segment device of the present invention; Figure 5 This is a front view of the sector segment frame in the large-pressure sector segment device of the present invention; Figure 6 This is a side view of the pressing component in the large pressing sector segment device of the present invention; Figure 7 This is a front view of the pressing component in the large pressing sector segment device of the present invention; Figure 8 This is a side view of the outer arc roller in the large-pressure sector segment device of the present invention; Figure 9This is a front view of the outer arc roller in the large-pressure sector segment device of the present invention.

[0020] The reference numerals in the background art are: 10. Clamping roller; 20. Hydraulic cylinder; 30. Frame.

[0021] The reference numerals in the accompanying drawings of this invention are: 1. Sector-shaped frame; 101. Upper frame; 102. Column; 103. Lower frame; 2. Pressing assembly; 201. Hydraulic cylinder; 2011. First hydraulic cylinder; 2012. Second hydraulic cylinder; 2013. Third hydraulic cylinder; 202. Base; 203. Inner arc roller; 2031. Inner arc roller body; 2032. First mounting seat; 3. Outer arc roller; 301. Outer arc roller body; 302. Second mounting seat; 4. Cast billet. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0023] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Implementation Method 1

[0026] like Figures 2 to 9As shown, the present invention provides a large-scale pressing sector segment device for pressing down a cast billet 4. The device includes a sector segment frame 1, an outer arc roller 3, and a pressing assembly 2. Both the outer arc roller 3 and the pressing assembly 2 are mounted on the sector segment frame 1, with the pressing assembly 2 positioned above the outer arc roller 3. The pressing assembly 2 includes a base 202, an inner arc roller 203, and at least three hydraulic cylinders 201. The at least three hydraulic cylinders 201 are spaced apart and evenly distributed along the width direction of the cast billet 4. The cylinder body of each hydraulic cylinder 201 is fixedly connected to the top of the sector segment frame 1, and the piston cylinder of each hydraulic cylinder 201 extends vertically downwards and connects to the top of a long strip-shaped base 202. The inner arc roller 203 is fixedly mounted on the bottom of the base 202, and is vertically opposite to the outer arc roller 3. The inner arc roller 203 and the outer arc roller 3 work together to press down the cast billet 4 passing between them.

[0027] In this invention, a pressing assembly 2 and an outer arc roller 3 are arranged vertically on a fan-shaped frame 1. The inner arc roller 203 of the pressing assembly 2 is vertically opposite to the outer arc roller 3. In actual operation, the pressing assembly 2 adjusts the force applied to the inner arc roller 203 by at least three hydraulic cylinders 201. Based on the real-time pressure value applied to the casting billet 4 by two of the hydraulic cylinders 201, the other hydraulic cylinder 201 is adjusted to actively press down and follow up with pressing down, thereby matching different pressing forces to the inner arc roller 203. Through the cooperation of the inner arc roller 203 and the outer arc roller 3, the casting billet 4 passing between the two can be pressed down, and the casting billet 4 can reach the preset pressing amount, which meets the requirements of large pressing operations for ultra-thick slabs. When pressing down the casting billet 4 with increased thickness, the internal quality of the casting billet 4 can still be guaranteed.

[0028] In an optional embodiment of the present invention, such as Figure 3 and Figure 7As shown, there are three hydraulic cylinders 201, namely the first hydraulic cylinder 2011, the second hydraulic cylinder 2012, and the third hydraulic cylinder 2013 located between the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012. Along the width direction of the billet 4, the first hydraulic cylinder 2011, the third hydraulic cylinder 2013, and the second hydraulic cylinder 2012 are arranged alternately and evenly. Displacement sensors are respectively installed on the first hydraulic cylinder 2011, the second hydraulic cylinder 2012, and the third hydraulic cylinder 2013. The displacement sensors can detect the extension and retraction of the piston rod of the corresponding hydraulic cylinder 201, thereby converting the extension and retraction of the piston rod into the pressing force applied by the hydraulic cylinder 201 to the billet 4. The action state of each hydraulic cylinder 201 is controlled according to the real-time pressure value of each hydraulic cylinder 201. In actual use, the displacement sensor can provide real-time feedback on the extension and retraction of the piston rod of the hydraulic cylinder 201 (i.e., the action position signal of the hydraulic cylinder 201). The hydraulic cylinder 201 is controlled by a proportional servo valve, which can accurately control the action position signal of the hydraulic cylinder 201 and thus obtain the pressure in the rodless chamber of the hydraulic cylinder 201.

[0029] Of course, pressure sensors can also be installed at the end of the piston rod of each hydraulic cylinder 201 to directly collect the pressing force applied by the hydraulic cylinder 201, so as to ensure higher accuracy.

[0030] In this embodiment, the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012 are both hydraulic cylinders that actively press down, and the third hydraulic cylinder 2013 is a hydraulic cylinder that can switch between following and actively pressing down.

[0031] In an optional embodiment of the present invention, such as Figure 2 As shown, there are multiple outer arc rollers 3 and multiple pressing components 2. These multiple outer arc rollers 3 and multiple pressing components 2 are continuously arranged along the length of the billet 4, and the multiple outer arc rollers 3 and multiple pressing components 2 correspond one-to-one vertically. In actual use, by cooperating with multiple outer arc rollers 3 and multiple pressing components 2, a larger pressing amount can be achieved to ensure that the requirements for large pressing are met. For example, if there are four outer arc rollers 3 and four pressing components 2, when the thickness of the billet 4 is 450mm to 500mm, the pressing force of one set of outer arc rollers 3 and pressing components 2 can be 1200t to 1500t; if a section of the pressing area consists of four sets of outer arc rollers 3 and pressing components 2, the entire section of the billet 4 provides a pressing force of 4800t to 6000t; that is, one set of outer arc rollers 3 and pressing components 2 can achieve a pressing amount of 4mm to 5mm, while the pressing amount of the entire section can reach 16mm to 20mm.

[0032] In an optional embodiment of the present invention, among the plurality of inner arc rollers 203 and the plurality of outer arc rollers 3, at least two sets of opposing inner arc rollers 203 and outer arc rollers 3 are driving rollers, and the remaining inner arc rollers 203 and outer arc rollers 3 are free rollers. If the number of outer arc rollers 3 and pressing components 2 are both 4, then along the conveying direction of the billet 4, the inner arc rollers 203 and outer arc rollers 3 in the second and fourth sets can be set as driving rollers to provide a stable driving force for conveying the billet 4.

[0033] In an optional embodiment of the present invention, such as Figures 2 to 5 As shown, the fan-shaped segment frame 1 includes an upper frame 101 and a lower frame 103 arranged in the horizontal direction. Both the upper frame 101 and the lower frame 103 are long strip-shaped plate structures. The upper frame 101 is located below the lower frame 103, and the two ends of the upper frame 101 and the lower frame 103 are connected by two vertically arranged columns 102. The pressing component 2 is fixedly arranged on the bottom surface of the upper frame 101, and the outer arc roller 3 is arranged on the top surface of the lower frame 103.

[0034] In an optional embodiment of the present invention, such as Figure 7 As shown, the inner arc roller 203 includes multiple inner arc roller bodies 2031. Multiple first mounting seats 2032 are spaced apart on the top surface of the lower frame 103 along the width direction of the casting billet 4. The multiple inner arc roller bodies 2031 are rotatably arranged between two adjacent first mounting seats 2032 to form a multi-section roller structure.

[0035] In an optional embodiment of the present invention, such as Figure 9 As shown, the outer arc roller 3 includes multiple outer arc roller bodies 301. The bottom of the base 202 is provided with multiple second mounting seats 302 at intervals along the width direction of the casting billet 4. The multiple outer arc roller bodies 301 are rotatably disposed between two adjacent second mounting seats 302 to form a multi-section roller structure.

[0036] Specifically, in this invention, the inner arc roller 203 has four segments (2031), and the outer arc roller 3 also has four segments (301), forming a four-segment roller. This four-segment roller structure significantly improves the roller's load-bearing capacity and bending resistance. For rollers of the same diameter and length, a single roller, when subjected to pressure in the center, behaves like a simply supported beam and is prone to bending. The multi-segment roller structure (four-segment roller) decomposes a long roller into four shorter segments, greatly reducing the span (distance between support points) of each segment. According to material mechanics, the bending deformation of a beam is proportional to the cube of the span; therefore, shortening the span greatly reduces bending, allowing each segment to more effectively apply the pressing force perpendicularly to the casting slab 4. Furthermore, the four-segment roller structure ensures a uniform distribution of the pressing force along the width of the casting slab 4, improving the uniformity of the internal quality of the casting slab 4 and preventing central porosity and segregation. Specifically, the integral long roller will elastically bend under high pressure, resulting in the actual pressure reduction in the middle of the roller body being less than that on both sides, causing uneven pressure reduction in the thickness direction of the cast billet 4 and affecting the core quality; while each section of the multi-segment roller is independently supported and pressurized, which can adapt to the contour of the cast billet 4, avoiding the problem of "low pressure in the middle and high pressure on both sides" caused by the deformation of the roller itself, and ensuring that the entire cast billet 4 can obtain uniform and sufficient large pressure reduction in the width direction.

[0037] Furthermore, the four-segment roller structure improves system reliability and stability while reducing maintenance costs. In a wide, thick plate sector driven by multiple hydraulic cylinders 201, it's difficult to ensure that all support points (hydraulic cylinders 201) are perfectly synchronized and absolutely aligned under heavy loads. If a single roller is used, even minor misalignment can cause the roller to jam and malfunction, generating a significant additional bending moment that could damage the bearings or roller body. In contrast, each segment of the multi-segment roller can independently adapt to different heights and angles within a certain range, thus absorbing misalignment and preventing internal stress concentration, allowing the sector segment to operate more smoothly.

[0038] In this invention, the working pressure of each hydraulic cylinder 201 is at least 32 MPa, and the pressing force of at least three hydraulic cylinders 201 is 1200t to 1500t. The diameter of the inner arc roller body 2031 is 450mm to 500mm; the diameter of the outer arc roller body 301 is 450mm to 500mm. This satisfies the following: when the thickness of the billet 4 is 450mm to 500mm, the pressing force of a set of outer arc rollers 3 and pressing components 2 can be 1200t to 1500t; if a section of the pressing area consists of 4 sets of outer arc rollers 3 and pressing components 2, the entire section of the billet 4 provides a pressing force of 4800t to 6000t; that is, a set of outer arc rollers 3 and pressing components 2 can achieve a pressing amount of 4mm to 5mm, while the pressing amount of the entire section can reach 16mm to 20mm.

[0039] The features and advantages of the large-short-segment pressing device of the present invention are as follows: In this large pressing sector section device, the inner arc roller 203 and the outer arc roller 3 cooperate to press down the billet 4 that passes between them, and ensure that the billet 4 reaches the preset pressing amount, which meets the requirements of large pressing operation for ultra-thick billets. When pressing down the billet 4 with increased thickness, the internal quality of the billet 4 can still be guaranteed.

[0040] Specifically, this large-reduction sector section device can achieve large reduction of ultra-thick slabs, with a single roll reduction of 4mm to 5mm and a 4-roll reduction of 16mm to 20mm, while ensuring the core quality of the slab 4.

[0041] Implementation Method 2

[0042] This invention provides a control method for a large-scale compressed sector segment, which is implemented using the aforementioned large-scale compressed sector segment device. The control method includes the following steps: Step S1: The hydraulic cylinder 201 receives a pressing action command; wherein, the command also includes a preset amount of pressing down required for the currently conveyed billet 4.

[0043] Step S2: Among the three hydraulic cylinders 201, the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012 drive the inner arc roller 203 to move downward, while the third hydraulic cylinder 2013 follows without applying pressure; that is, the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012 adopt the displacement control mode, while the third hydraulic cylinder 2013 adopts the follow-up mode.

[0044] The third hydraulic cylinder 2013 does not actively apply pressure, and its control valve remains in a constant state, so that the third hydraulic cylinder 2013 can move passively under the drive of the base 202 by the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012.

[0045] Step S3: Real-time acquisition of the pressure values ​​applied to the casting billet 4 by the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012. If the pressure values ​​applied to the casting billet 4 by the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012 both exceed the preset pressure value upper limit, then the third hydraulic cylinder 2013 actively applies pressure to the casting billet 4. Step S4: The first hydraulic cylinder 2011, the second hydraulic cylinder 2012 and the third hydraulic cylinder 2013 work together to press down the billet 4 until the billet 4 reaches the preset pressing amount; that is, the displacement of the first hydraulic cylinder 2011, the second hydraulic cylinder 2012 and the third hydraulic cylinder 2013 are all stable near the preset target position (this position corresponds to the preset pressing amount of the billet 4), and the pressing process is completed.

[0046] Step S5: The large pressing sector receives the lifting command, and the third hydraulic cylinder 2013 changes from actively applying pressure to following up. At this time, the pressing force applied by the third hydraulic cylinder 2013 is 0. The first hydraulic cylinder 2011 and the second hydraulic cylinder 2012 drive the third hydraulic cylinder 2013 to move upward, that is, the third hydraulic cylinder 2013 is lifted with the base 202 until the inner arc roller 203 moves upward and separates from the billet 4.

[0047] In an optional embodiment of the present invention, step S3 includes obtaining the pressure value actively applied to the billet 4 by the third hydraulic cylinder 2013, wherein the pressure value K applied by the third hydraulic cylinder 2013 satisfies the following condition: ; in, The pressure value applied to the first hydraulic cylinder 2011, The pressure value applied to the second hydraulic cylinder 2012. This is the displacement adjustment coefficient.

[0048] In the above formula, The base pressure, i.e., the pressing force applied by the third hydraulic cylinder 2013, depends on the average value of the pressing forces applied in real time by the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012. This ensures that the total pressing force applied by the three hydraulic cylinders 201 tends to be balanced, avoiding excessive or insufficient pressing force applied by the third hydraulic cylinder 2013. As a displacement adjustment coefficient, it is used to quickly eliminate positional deviations.

[0049] Specifically, The values ​​are determined as follows: If the downward pressing distance of the third hydraulic cylinder 2013 meets the requirements <0.5m, at this time the moving position of the third hydraulic cylinder 2013 is very close to the position corresponding to the required reduction amount of the pre-cast billet 4, therefore, It can be 0. In this case, the third hydraulic cylinder 2013 works only with the average pressure of the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012. If the downward pressing distance of the third hydraulic cylinder 2013 meets the requirements ≥0.5m, then it satisfies That is, if Less than This indicates that the pressing amount of the third hydraulic cylinder 2013 is less than that of the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012. A negative value reduces the pressure K applied by the third hydraulic cylinder 2013, causing the third hydraulic cylinder 2013 to reduce pressure so that the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012 can pull the third hydraulic cylinder 2013 back into position. If Greater than This indicates that the pressing amount of the third hydraulic cylinder 2013 exceeds the pressing amount of the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012. If the value is positive, the pressure value K applied by the third hydraulic cylinder 2013 will increase. At this time, the pressure applied by the third hydraulic cylinder 2013 will increase and will be closer to the billet 4. Then, it is necessary to wait for the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012 to act, so that the first hydraulic cylinder 2011, the second hydraulic cylinder 2012 and the third hydraulic cylinder 2013 can be matched and pressed down synchronously.

[0050] in, This refers to the downward pressing distance of the third hydraulic cylinder 2013. This is the preset final pressing position for the billet 4.

[0051] In an optional embodiment of the present invention, in step S5, the pressure values ​​applied by the first hydraulic cylinder 2011 and the second hydraulic cylinder 2012 to the billet 4 are both lower than the preset pressure threshold lower limit (e.g., lower than 12MPa), indicating that the resistance of each hydraulic cylinder 201 to the billet 4 is small or has been separated from the contact with the billet 4. At this time, the third hydraulic cylinder 2013 can be controlled to change from actively applying pressure to following up, so as to save energy and prepare for the next cycle.

[0052] The control method for the large reduction sector of the present invention, through the matching control of multiple hydraulic cylinders 201, can ensure that the billet 4 reaches the preset reduction amount, meet the requirements for large reduction operations on ultra-thick billets, and still ensure the internal quality of the billet 4 when performing reduction operations on billets 4 with increased thickness.

[0053] This invention, through the matched control of multiple hydraulic cylinders 201, ensures a uniform distribution of pressing force, avoids insufficient pressing at the center of the billet 4, and guarantees uniform quality of the billet 4 throughout its width. Controlled by the third hydraulic cylinder 2013, a powerful, adjustable downward pressure is specifically provided to the center of the rollers, effectively compensating for the elastic deformation of the frame and roller system, and ensuring a uniform pressure distribution along the width of the billet 4.

[0054] In this invention, the control of multiple hydraulic cylinders 201 avoids the "mutual struggle" between them, achieving smooth coordination. If three rigidly connected hydraulic cylinders 201 all employ simple displacement control, due to slight differences in machining, installation, and load, internal friction will inevitably occur between the different cylinders (i.e., some cylinders 201 are "pulled" while others are "pushed"). This can lead to equipment vibration, cylinder damage, and control instability. However, the active-follow-up control of multiple hydraulic cylinders 201 in this application greatly improves the stability and reliability of the system, protecting the equipment from damage.

[0055] The control method for the large-reduction sector segment of the present invention has the characteristics and advantages of the large-reduction sector segment device described above, which will not be repeated here.

[0056] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0057] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0058] The above are merely a few embodiments of the present invention. Although the embodiments disclosed in the present invention are as described above, the content is only for the purpose of facilitating understanding of the present invention and is not intended to limit the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A large-scale pressing sector device for pressing down a cast billet, characterized in that, The large compressed sector segment device includes: Sector-shaped frame; An outer arc roller is disposed on the sector-shaped segment frame; A pressing assembly is disposed on the sector segment frame and is located above the outer arc roller; The pressing assembly includes a base, an inner arc roller, and at least three hydraulic cylinders. The at least three hydraulic cylinders are spaced apart along the width direction of the billet, and the cylinder body of the hydraulic cylinder is connected to the top of the sector-shaped frame. The piston cylinder of the hydraulic cylinder extends vertically downward and is connected to the top of the base. The inner arc roller is located at the bottom of the base and is vertically opposite to the outer arc roller, so that the billet passing between the two is pressed down by the cooperation of the inner arc roller and the outer arc roller.

2. The large-scale compressed sector segment device as described in claim 1, characterized in that, The number of hydraulic cylinders is three. Along the width direction of the billet, the three hydraulic cylinders are a first hydraulic cylinder, a second hydraulic cylinder, and a third hydraulic cylinder located between the first hydraulic cylinder and the second hydraulic cylinder. Displacement sensors are respectively installed on the first hydraulic cylinder, the second hydraulic cylinder, and the third hydraulic cylinder to detect the extension and retraction of the piston rod of the corresponding hydraulic cylinder. The first hydraulic cylinder and the second hydraulic cylinder are both active downward hydraulic cylinders, and the third hydraulic cylinder is a hydraulic cylinder that can switch between passive and active downward movement.

3. The large-scale compressed sector segment device as described in claim 2, characterized in that, The number of the outer arc rollers and the pressing components are both multiple, and the multiple outer arc rollers and the multiple pressing components are continuously arranged along the length direction of the casting billet, and the multiple outer arc rollers and the multiple pressing components correspond one-to-one in the vertical direction.

4. The large-short-segment pressing device as described in claim 3, characterized in that, Of the plurality of inner arc rollers and the plurality of outer arc rollers, at least two sets of opposing inner arc rollers and outer arc rollers are drive rollers, and the remaining inner arc rollers and outer arc rollers are free rollers.

5. The large-scale compressed sector segment device as described in claim 2, characterized in that, The sector-shaped frame includes an upper frame and a lower frame arranged in a horizontal direction. The upper frame is located below the lower frame, and the upper frame and the lower frame are connected by columns. The pressing component is disposed on the bottom surface of the upper frame, and the outer arc roller is disposed on the top surface of the lower frame.

6. The large-scale compressed sector segment device as described in claim 5, characterized in that, The inner arc roller includes multiple inner arc roller bodies. Multiple first mounting seats are spaced apart on the top surface of the lower frame along the width direction of the casting billet. The multiple inner arc roller bodies are rotatably disposed between two adjacent first mounting seats to form a multi-segment roller structure.

7. The large-short-segment pressing device as described in claim 6, characterized in that, The outer arc roller includes multiple outer arc roller bodies. The bottom of the base is provided with multiple second mounting seats at intervals along the width direction of the casting billet. The multiple outer arc roller bodies are rotatably disposed between two adjacent second mounting seats to form a multi-segment roller structure.

8. A method for controlling a large-scale compressed sector segment, implemented using the large-scale compressed sector segment device as described in any one of claims 2 to 7, characterized in that, The control method includes the following steps: Step S1: The hydraulic cylinder receives the downward pressing action command; Step S2: Of the three hydraulic cylinders, the first and second hydraulic cylinders drive the inner arc roller to move downwards, while the third hydraulic cylinder follows without applying pressure. Step S3: Real-time acquisition of the pressure values ​​applied to the billet by the first hydraulic cylinder and the second hydraulic cylinder. If the pressure values ​​applied to the billet by the first hydraulic cylinder and the second hydraulic cylinder both exceed the preset pressure value upper limit, then the third hydraulic cylinder actively applies pressure to the billet. Step S4: The first hydraulic cylinder, the second hydraulic cylinder, and the third hydraulic cylinder work together to press down the billet until the billet reaches the preset pressing amount; Step S5: The third hydraulic cylinder changes from actively applying pressure to following up, and the first and second hydraulic cylinders drive the third hydraulic cylinder to move upward, until the inner arc roller moves upward and separates from the billet.

9. The control method for the large compressed sector segment as described in claim 8, characterized in that, Step S3 includes obtaining the pressure value actively applied to the billet by the third hydraulic cylinder, wherein the pressure value K applied by the third hydraulic cylinder satisfies the following condition: ； in, The pressure value applied to the first hydraulic cylinder. The pressure value applied to the second hydraulic cylinder. This is the displacement adjustment coefficient.

10. The control method for the large compressed sector segment as described in claim 9, characterized in that, If the downward pressure distance of the third hydraulic cylinder satisfies <0.5m, then =0; If the downward pressure distance of the third hydraulic cylinder satisfies ≥0.5m, then it satisfies ; in, The downward pressing distance of the third hydraulic cylinder. This is the preset final pressing position for the cast billet.

11. The control method for the large compressed sector segment as described in claim 8, characterized in that, In step S5, if the pressure applied to the billet by the first hydraulic cylinder and the second hydraulic cylinder is lower than the preset pressure threshold lower limit, then the third hydraulic cylinder changes from actively applying pressure to following the action.

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