Improvement method for rolling line of single rolling mill capable of realizing double-train rolling

Abstract

The invention discloses an improvement method of a single rolling mill rolling line capable of achieving double-train rolling. The improvement method is characterized in that a lifting device is arranged at the starting position of a rolling mill input roller way of the single rolling mill rolling line; the lifting device is used for lifting blanks on the roller way for preset time, and the blanks can pass through / stay on the surface of the roller way below the position during lifting; by setting the lifting time of the lifting device and the staying time of the blanks on the surface of the roller way, the blanks with different cooling time requirements can pass through the roller way in batches; and the cooled blanks are conveyed to a reversible rolling mill through a roller way to be subjected to rough rolling and finish rolling in sequence, and then the blanks of different specifications are rolled at the same time through the double-train rolling technology. Two paths are arranged through the lifting device, temperature is controlled to enter the rolling mill, waiting time is shortened, and the utilization rate of the rolling mill is greatly increased.

Description

Technical Field

[0001] The invention relates to the technical field of steel production, and in particular to an improvement method for a single-stand rolling mill line capable of realizing double-train rolling. Background Art

[0002] Rolling technology is an important method in metal processing, which is used to deform metal billets through one or more pairs of rollers to achieve the desired shape and size. The multi-bill rolling process for medium and thick plates includes single train mode and double train mode. In the single train mode, one rack is both a roughing mill and a finishing mill; there are problems such as long time for the intermediate billet to be temperature controlled and waited for rolling, a large amount of energy consumption is wasted in the rolling gap, low rolling efficiency, and increased production costs.

[0003] Double train rolling refers to the use of two rolling mills arranged in front and behind on the same rolling line, like two "trains" rolling the steel plates in sequence. Through reasonable rolling mill layout and process parameter control, efficient and high-precision rolling of steel plates can be achieved. This process can (1) improve production efficiency: the two rolling mills work at the same time, reducing the waiting time of the steel plates during the rolling process, greatly improving production efficiency. (2) improve the quality of steel plates: double train rolling can achieve more uniform deformation, reduce residual stress inside the steel plates, and improve the flatness and dimensional accuracy of the steel plates. (3) adapt to a variety of specifications: by adjusting the parameters of the two rolling mills, it can adapt to the rolling needs of steel plates of different thicknesses, widths and lengths. (4) energy saving and environmental protection: compared with the traditional single-stand rolling mill, the double train rolling process has certain advantages in energy consumption and pollutant emissions.

[0004] The proposal of double train rolling technology is a supplement or improvement to the traditional rolling method. The existing applicant's plate rolling line is a single rolling mill layout, which theoretically cannot realize the double train rolling process. The goal of this application is to enable the existing single-frame rolling mill rolling line to realize the double train rolling process and achieve the maximum efficiency of the original rolling line.

[0005] The prior art publication number CN116673327A discloses a 5-meter rolling mill double-train rolling method, which improves the existing single-train mode in terms of logic and program, uses the heated steel-out roller as the temperature-controlled waiting area for rolling of the double train, and uses the temperature-controlled waiting time of the first train to complete the assembly rolling of the second train to realize the double-train mode. There is no corresponding improvement on the hardware, and the cost and risk of the complex control logic modification are relatively large. Summary of the invention

[0006] 1. Technical problems to be solved: In view of the above technical problems, the present invention provides an improvement method for a single-frame rolling mill line capable of realizing double-train rolling. By making corresponding improvements to the existing single-frame rolling mill line, it not only has the advantages of "double train" with less billet temperature control and waiting time, which can increase production and ultimately reduce costs; and it also reduces the hardware cost of the improvement as much as possible. At the same time, the improved logic will not have collision accidents, thereby ensuring the safety of the rolling line.

[0007] 2. Technical solution: An improved method for a single-stand rolling mill line capable of realizing dual-train rolling, characterized in that: a lifting device is set at the starting position of the rolling mill input roller of the single-stand rolling mill line; the lifting device is used to lift the billet on the roller for a preset time, and the roller surface below the position can pass / retain the billet during the lifting; by setting the lifting time of the lifting device and the residence time of the billet on the roller surface, billets with different cooling time requirements can pass through the roller in batches; the cooled billets are transported to the reversible rolling mill through the roller and undergo rough rolling and finish rolling in sequence, thereby realizing the dual-train rolling process for simultaneous rolling of billets of different specifications.

[0008] Furthermore, the lifting device includes a plurality of lifting beams for lifting, and the extension direction of each lifting beam is the same as the extension direction of a single roller of the roller; when there is no lifting, adjacent lifting beams are spaced in the cavity between adjacent single rollers, and their height is lower than the height of the roller line; both ends of the plurality of lifting beams are connected to a lifting main beam frame perpendicular thereto, and the upper end of the lifting main beam frame is fixedly connected to two lifting beams symmetrically distributed perpendicular thereto, and a lifting cylinder is arranged at both ends of the lifting beam, and the lifting beam is lifted up and down synchronously under the action of the synchronous up and down movement of the lifting cylinder; the lifting cylinder is a cylinder with an extreme position stroke and a mechanical locking structure; the lifting frame is provided with a cylinder displacement sensor for locating the displacement of the cylinder during the upward stroke; a proximity switch for controlling the downward stroke of the cylinder and a position sensor for detecting the position of the lifting beam are arranged under the lifting frame; Guide slide blocks are provided at both ends of the lifting beam, and the guide slide blocks form a dynamic pair with the guide slide rails embedded in the inner side of the guide frame; the guide frame includes a guide frame column, a guide frame base and a guide frame connecting beam; the guide slide rail is located on the inner side of the guide frame column; the upper end of the guide frame base is fixedly connected to the lower end of the guide frame column, and the lower end thereof is fixedly connected to the surface of the civil foundation of the rolling line at both ends of the roller table; the guide frame connecting beam is used to connect two adjacent guide frame columns.

[0009] Furthermore, the lifting device also includes a cooling water system; the cooling water system includes a circulating cooling water pipeline arranged in the lifting support beam of the lifting device and the guide frame connecting beam to achieve cooling of the lifting device.

[0010] Furthermore, the lifting device is divided into two groups, and the two groups of lifting devices are sequentially distributed on the input roller table of the rolling mill; the lifting action control between the two includes individual action control and synchronous action control.

[0011] Furthermore, the lifting beams of each lifting device are made of 12Cr2Mo1VR or 2520 materials, and each group of lifting beams has 6 beams. Heat-resistant blocks are arranged on the surface of the lifting beams; the guide frame columns are connected to the guide frame base by fastening bolts; the guide frame base is fixed to the civil foundation by anchor bolts; the 4 lifting cylinders are respectively built into the 4 guide frame columns, and the middle hinge shaft of the lifting cylinder is connected to the self-lubricating ear shaft on the guide frame, and the lifting cylinder hinge joint is articulated with the fulcrum on the lifting beam; the guide frame columns are connected to the guide frame connecting beam with bolts or welding to form an integral frame structure; the guide frame columns are welded structures, and a heat insulation baffle is arranged inside.

[0012] Furthermore, it also includes improvements to the control system; the improved control system can achieve manual or automatic control of the lifting device.

[0013] 3. Beneficial effects: (1) The method disclosed herein is an improved method for a single-stand rolling mill line capable of realizing double-train rolling. A lifting device is set on the input roller table of the rolling mill. The lifted billet is used as one train of the "double train", and the billet that is not lifted is used as the other train. Two paths are set by the lifting device, and the temperature is controlled to enter the rolling mill, which reduces the waiting time and greatly improves the utilization rate of the rolling mill.

[0014] (2) This method discloses a method for improving a single-stand rolling mill line capable of realizing double-train rolling, which is to improve the original single-stand rolling mill line, minimize the cost of transformation, and ensure the high-efficiency application of the original equipment. The lifting device makes full use of the basic space of the existing conveyor roller, occupies a small area, makes little change to the original equipment (only the guard plate of the original roller equipment is removed), and fully considers the convenience of installation and disassembly of new equipment and reused equipment. In terms of control, the automatic and manual control operations of the lifting equipment are incorporated into the original rolling mill automation control system.

[0015] (3) The present invention discloses an improved method for a single-stand rolling mill capable of realizing double-train rolling. The equipment foundation and columns are arranged on both sides of the original rolling mill roller table, which greatly reduces the occupied area. At the same time, there is no need to modify the original rolling mill equipment, and the equipment installation does not require special downtime. The equipment can be installed and debugged during normal maintenance, and production and installation can be carried out simultaneously.

[0016] (4) In this method, the hardware of the lifting device is made of high-temperature resistant materials, and a water-cooling structure is used to ensure the strength and safety of the beam frame under high temperature conditions; the software adopts hydraulic, water cooling, flow, temperature, lifting position, and safety interlocking full closed-loop automatic control. At the same time, the equipment control is linked with the original rolling line control to realize fully automated production of the rolling line. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a single-stand rolling mill rolling line improved by the present invention; Figure 2 for Figure 1 An enlarged view of the two lifting devices in FIG. Figure 3 for Figure 2 An enlarged overall schematic diagram of the middle single group lifting device; Figure 4 for Figure 3 An enlarged view of the guide frame in FIG.

[0018] Figure numerals: roller table 1; lifting device 2; rolling mill 3; leveling machine 4; lifting support beam 5; lifting main beam frame 6; lifting beam 7; guide frame column 8; guide frame base 9; guide frame connecting beam 10; cooling water pipeline 11; guide slide rail 12; lifting cylinder 13. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings.

[0020] The process flow of the existing single-stand rolling mill is as shown in the attached figure. Figure 1 As shown in the figure, from left to right, the billet coming out of the walking beam heating furnace is dephosphorized and then cooled to a certain temperature by the roller table 1 and then sent to the rolling mill 3 for rough rolling and finishing rolling, and then enters the leveling machine 4 for straightening and then enters the cooling bed (not shown in the figure) to realize the rolling of the billet. Figure 2 is a schematic diagram of the installation of the lifting device designed in this method.

[0021] An improved method for a single-stand rolling mill line capable of realizing dual-train rolling, characterized in that: a lifting device is set at the starting position of the rolling mill input roller of the single-stand rolling mill line; the lifting device is used to lift the billet on the roller for a preset time, and the roller surface below the position can pass / retain the billet during the lifting; by setting the lifting time of the lifting device and the residence time of the billet on the roller surface, billets with different cooling time requirements can pass through the roller in batches; the cooled billets are transported to the reversible rolling mill through the roller and undergo rough rolling and finish rolling in sequence, thereby realizing the dual-train rolling process for simultaneous rolling of billets of different specifications.

[0022] Furthermore, the lifting device includes a plurality of lifting beams for lifting, and the extension direction of each lifting beam 5 is the same as the extension direction of a single roller of the roller; when there is no lifting, adjacent lifting beams are spaced in the cavity between adjacent single rollers, and their height is lower than the height of the roller line; both ends of the plurality of lifting beams are connected to a lifting main beam frame 6 perpendicular thereto, and the upper end of the lifting main beam frame is fixedly connected to two lifting beams 7 perpendicular thereto and symmetrically distributed, and a lifting cylinder 13 is arranged at both ends of the lifting beam, and the lifting beam is lifted up and down synchronously under the action of the synchronous up and down movement of the lifting cylinder; the lifting cylinder is a cylinder with an extreme position stroke and a mechanical locking structure; the lifting frame is provided with a cylinder displacement sensor for locating the displacement of the cylinder during the upward stroke; a proximity switch for controlling the downward stroke of the cylinder and a position sensor for detecting the position of the lifting beam are arranged under the lifting frame; As attached Figure 4 As shown, guide sliders are provided at both ends of the lifting beam, and the guide sliders form a dynamic pair with the guide slide rails 12 embedded in the inner side of the guide frame; the guide frame includes a guide frame column 8, a guide frame base 9 and a guide frame connecting beam 10, which is frame-shaped; the guide slide rail is located on the inner side of the guide frame column; the upper end of the guide frame base is fixedly connected to the lower end of the guide frame column, and the lower end thereof is fixedly connected to the surface of the civil foundation of the rolling line at both ends of the roller table; the guide frame connecting beam is used to connect two adjacent guide frame columns.

[0023] Furthermore, the lifting device also includes a cooling water system; the cooling water system includes a circulating cooling water pipe 11 arranged in the lifting support beam of the lifting device and the guide frame connecting beam to achieve cooling of the lifting device.

[0024] Furthermore, the lifting device is divided into two groups, and the two groups of lifting devices are sequentially distributed on the input roller table of the rolling mill; the lifting action control between the two includes individual action control and synchronous action control.

[0025] Furthermore, the lifting beams of each lifting device are made of 12Cr2Mo1VR or 2520 materials, and each group of lifting beams has 6 beams. Heat-resistant blocks are arranged on the surface of the lifting beams; the guide frame columns are connected to the guide frame base by fastening bolts; the guide frame base is fixed to the civil foundation by anchor bolts; the 4 lifting cylinders are respectively built into the 4 guide frame columns, and the middle hinge shaft of the lifting cylinder is connected to the self-lubricating ear shaft on the guide frame, and the lifting cylinder hinge joint is articulated with the fulcrum on the lifting beam; the guide frame columns are connected to the guide frame connecting beam with bolts or welding to form an integral frame structure; the guide frame columns are welded structures, and a heat insulation baffle is arranged inside.

[0026] Furthermore, it also includes improvements to the control system; the improved control system can achieve manual or automatic control of the lifting device. Specific embodiment 1 As attached Figure 2 , 3 As shown, in the double train rolling mode, the position of the intermediate billet of the first train is adjusted from B1-B2 to the C4-C6 area (i.e., the intermediate billet lifting device area); on the basis of adding a lifting device in the C4-C6 area of ​​the warm billet position in front of the rolling mill, the length is about 20m, and the last steel plate of the three-bill rolling or the last two steel plates of the four-bill rolling are lifted to the top of the roller when controlled in front of the machine. In this embodiment, two sets of lifting devices are set, and the effectiveness of this method is illustrated by comparing the original relevant technical parameters with the improved technical parameters.

[0028] The relevant technical parameters of the original rolling line include: casting steel type: ordinary carbon steel, alloy steel, etc.; billet conditions: thickness: 150, 180, 220, 260, 320, 370, 460, 600mm; width: 1600mm~2800mm; length 2500mm~4500mm; temperature: max.900℃~1250℃; billet mass: 5.25t~45t. Roller parameters: roller diameter: 450mm; roller length: 5000mm; roller distance: 800mm; slab speed: 12m / min - 40m / min (adjustable); roller surface elevation: +800mm.

[0029] In this embodiment, a single lifting device is 9460 mm long, 8450 mm wide and 4080 m high. Two lifting devices are set at the starting position of the input roller table of the rolling mill. The lifting device can select a single lifting device to lift a short intermediate billet according to the length of the intermediate billet, and use two lifting devices to simultaneously lift a long intermediate billet.

[0030] The relevant parameters of the lifting device in this embodiment also include: applicable intermediate billet specifications: thickness: 50-300mm width: 1600-4800mm, length: 6000-20000mm; maximum weight of lifting intermediate billet: 45t; intermediate billet temperature: not exceeding 1000℃; height from the lower surface of the water beam to the roller surface: 900mm; fastest lifting time 30s; lifting and leaving time: not more than 40min; drive mode: hydraulic drive; electrical control mode: automatic / manual control, automatic control priority; power supply: AC 380V, frequency 50Hz; hydraulic working pressure 14Mpa. Specific embodiment 2 In this embodiment, two groups of four billets, each of which has a different cooling time requirement, are used as an example to illustrate how to implement the double train process through the improved device.

[0032] The first group of two billets come out of the heating furnace first, and after dephosphorization, they enter the input roller table. At this time, the lifting device is in the lowest position; the first group of two billets enter the corresponding lifting device position in turn, and the system issues a lifting command; at this time, the lifting device can lift the first and second billets in sequence, and the preset lifting time is the same, or two different times; or the two billets can be lifted at the same time, and the lifted billet is used as the first train. After lifting, the second group of two billets pass through the roller table and enter the roller table below the lifting device, and stay for a preset time; the time the lower billet stays is usually shorter than the time the upper billet stays. The lower billet passes through the roller table first and enters the rolling mill, and the time for the upper billet to enter the rolling mill can be set according to actual needs. Specific embodiment 3 This method can realize the following aspects of tracking control logic: 1. Tracking changes in multi-batch mode The original control logic: When multi-bill rolling is adopted, after the rough rolling of the last steel plate of the multi-bill is completed, it needs to go to the roller table behind the machine to participate in the billet assembly, and then go to the front of the machine together with several other steel plates to enter the temperature waiting area, among which the first steel plate is waiting for rolling at the rolling mill position.

[0034] Control logic after optimization: When multi-bill rolling is adopted, after the rough rolling of the last steel plate of the multi-bill is completed, it goes directly to the temperature control area C4 in front of the machine, and the first few steel plates behind the machine follow the last steel plate into the temperature waiting area in front of the machine (the position is the same as the original position), among which the first steel plate waits for rolling at the rolling mill position.

[0035] The following 2 and 3 control modes are based on the first one to carry out double train rolling 2. Three-dimensional rolling mode double billet Before the double billet is rolled, the system automatically calculates that if the length of the second intermediate billet of the double billet plus the length of the first rolled piece is greater than 62 meters, the second steel plate of the double billet will enter the center of the intermediate billet lifting device 1 and 2 after the rough rolling is completed (the center point of the steel plate corresponds to the center point of the lifting device), and then the intermediate billet lifting device will automatically rise, and when the first steel plate is cast, the tail will leave the intermediate billet lifting device, and the intermediate billet lifting device will fall. Then it will enter the rolling sequence.

[0036] 3. Three-dimensional rolling mode for three or four billets When rolling multiple billets, when the sum of the lengths of the intermediate billets is greater than 35.4 meters. After the rough rolling of the last steel plate of the multiple billets is completed, it enters the temperature control area. If the length is greater than 10 meters, the position stops between the intermediate billet lifting devices 1 and 2, and the lifting device starts to lift. If the length of the intermediate billet is less than 10 meters, the position stays in the middle of the intermediate billet lifting device 1, and the lifting device starts to lift. After lifting in the above two situations, the first few billets to be warmed up enter the lower part of the lifting frame from 3 meters in front of the intermediate billet lifting device that needs to be lifted and swing. After the second to last intermediate billet leaves 3 meters below the lifting device, the lifting device starts to fall and prepare for steel rolling.

[0037] The present method is not limited to the above-mentioned implementation logic. It can be seen from this embodiment that the lifting device of the present method can not only realize the lifting of two billets at the same time, the lifting of a single billet in sequence, and the lifting of a long billet at the same time (two groups of lifting devices lift one long billet at the same time); it has the characteristics of flexible and diverse combination forms.

[0038] Although the present invention has been disclosed as above in terms of preferred embodiments, they are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined by the claims of this application.

Claims

1. An improved method for a single-stand rolling mill capable of achieving double-train rolling, characterized in that: A lifting device is arranged at the starting position of the rolling mill input roller table of the single-stand rolling mill rolling line; the lifting device is used to lift the billet on the roller table for a preset time, and during the lifting, the roller table surface below the position can pass / stay the billet; By setting the lifting time of the lifting device and the residence time of the billet on the roller surface, billets with different cooling time requirements can be passed through the roller in batches; the cooled billets are transported to the reversible rolling mill through the roller and undergo rough rolling and finish rolling in sequence, thereby realizing the dual-train rolling process for simultaneous rolling of billets of different specifications.

2. The improved method of a single-stand rolling mill capable of achieving double-train rolling according to claim 1, characterized in that: The lifting device includes a plurality of lifting beams for lifting, and the extension direction of each lifting beam is the same as the extension direction of a single roller of the roller table; when there is no lifting, adjacent lifting beams are spaced in the cavity between adjacent single rollers, and their height is lower than the height of the roller table line; both ends of the plurality of lifting beams are connected to a lifting main beam frame perpendicular thereto, and the upper end of the lifting main beam frame is fixedly connected to two lifting beams symmetrically distributed perpendicular thereto, and a lifting cylinder is arranged at both ends of the lifting beam, and the lifting beam is lifted up and down synchronously under the action of the synchronous up and down movement of the lifting cylinder; the lifting cylinder is a cylinder with an extreme position stroke and a mechanical locking structure; the lifting frame is provided with a cylinder displacement sensor for locating the displacement of the cylinder during the upward stroke; a proximity switch for controlling the downward stroke of the cylinder and a position sensor for detecting the position of the lifting beam are arranged under the lifting frame; Guide slide blocks are provided at both ends of the lifting beam, and the guide slide blocks form a dynamic pair with the guide slide rails embedded in the inner side of the guide frame; the guide frame includes a guide frame column, a guide frame base and a guide frame connecting beam; the guide slide rail is located on the inner side of the guide frame column; the upper end of the guide frame base is fixedly connected to the lower end of the guide frame column, and the lower end thereof is fixedly connected to the surface of the civil foundation of the rolling line at both ends of the roller table; the guide frame connecting beam is used to connect two adjacent guide frame columns.

3. The improved method of a single-stand rolling mill capable of realizing double-train rolling according to claim 2, characterized in that: The lifting device also includes a cooling water system; the cooling water system includes a circulating cooling water pipeline arranged in the lifting support beam of the lifting device and the guide frame connecting beam to achieve cooling of the lifting device.

4. The improved method of a single-stand rolling mill capable of achieving double-train rolling according to claim 1, characterized in that: The lifting devices are divided into two groups, and the two groups of lifting devices are sequentially distributed on the input roller table of the rolling mill; the lifting action control between the two includes individual action control and synchronous action control.

5. The improved method of a single-stand rolling mill capable of achieving double-train rolling according to claim 2, characterized in that: The lifting beams of each lifting device are made of 12Cr2Mo1VR or 2520 materials, and each group of lifting beams consists of 6 beams. Heat-resistant blocks are arranged on the surface of the lifting beams. The guide frame columns are connected to the guide frame base by fastening bolts. The guide frame base is fixed to the civil foundation by anchor bolts. The 4 lifting cylinders are respectively built in the 4 guide frame columns, and the middle hinge shaft of the lifting cylinder is connected to the self-lubricating ear shaft on the guide frame. The lifting cylinder hinge joint realizes joint articulation with the fulcrum on the lifting beam. The guide frame columns are connected to the guide frame connecting beams by bolts or welding to form an integral frame structure. The guide frame columns are welded structures, and are provided with heat insulation baffles inside.

6. The improved method of a single-stand rolling mill capable of achieving double-train rolling according to claim 1, characterized in that: It also includes improvements to the control system; the improved control system can achieve manual or automatic control of the lifting device.

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