Medium bar production system

Abstract

The application provides a medium-large bar production system, relates to the technical field of metallurgical equipment, and comprises a medium bar processing line, a large bar processing line, a front shared production line and a rear shared production line, the medium bar processing line comprises a plurality of medium bar processing units; the large bar processing line is arranged in parallel with the medium bar processing line, and the large bar processing line comprises a plurality of large bar processing units; the front shared production line is connected with the medium bar processing line and the large bar processing line, and is used for conveying the processed bars to the medium bar processing line or the large bar processing line; the rear shared production line is connected with the medium bar processing line and the large bar processing line, and is used for outputting the processed bars input by the medium bar processing line or the large bar processing line. The medium bar processing line and the large bar processing line in the application can share the front shared production line and the rear shared production line, thereby reducing the demand for repeated construction, and greatly reducing the investment and construction cost of the production line.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment technology, and in particular to a medium and large bar production system. Background Technology

[0002] In special steel production enterprises, the diameter is usually determined according to different product specifications. Rolled products of 1000 and above are called large bars, with the largest size reaching 1000. And the diameter The product is called a medium-sized bar. Large and medium-sized bars are produced on separate production lines, each with its own process layout and equipment configuration.

[0003] Due to the large size of the products produced on the large bar production line, the rolling mill equipment is relatively large, resulting in lower dimensional accuracy. Subsequent machining processes, such as turning, are required to improve dimensional accuracy. Furthermore, the large cross-sectional dimensions of the bars make online cooling during rolling prone to uneven cross-sectional temperature distribution, necessitating post-rolling heat treatment methods such as slow cooling to improve their internal microstructure. Because of the large product size, the large bar production line requires the use of billets with larger cross-sectional areas (such as 400mm × 500mm rectangular billets or...). Medium bar production lines produce smaller, higher-quality products. They can use round billets (280mm x 360mm and larger) to meet the compression ratio requirements of different product specifications. Compared to large bar production lines, medium bar production lines produce smaller billets with higher quality requirements. They can reduce or eliminate post-rolling processing through online controlled rolling and cooling processes, achieving energy savings. Furthermore, the smaller product specifications of medium bar production lines necessitate the use of billets with smaller cross-sectional areas (such as 280mm x 360mm rectangular billets) to save on investment and energy consumption.

[0004] The existing large bar production line and medium bar production line have a large overlap in product size specifications. Due to different quality requirements for their respective products, most special steel production enterprises need to build one large bar production line and one medium bar production line, which has the following disadvantages: (1) Building two independent production lines requires a large amount of capital investment and a large number of personnel, resulting in high production costs and equipment maintenance costs; (2) Affected by market supply and demand, both large bar and medium bar production lines face different load production pressures, resulting in low equipment utilization; (3) Due to the specialization of the production lines, it is difficult to respond quickly to market changes and diversified demands; (4) There is waste in resource allocation, especially in raw material and energy consumption, and the duplication of construction of two production lines increases the cost burden of enterprises; (5) The operation of two production lines increases energy consumption and emissions, which is not conducive to the sustainable development and environmental protection requirements of enterprises; (6) Due to the independence of the production lines, the application of new technologies often needs to be implemented on two production lines separately, increasing the cost of research and development and transformation. Therefore, how to better integrate the large bar production line and the medium bar production line to reduce costs, improve efficiency, and enhance the flexibility and market adaptability of the production line has become an urgent technical problem to be solved. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a medium and large bar production system for reducing costs, improving efficiency, and enhancing the flexibility and market adaptability of the production line.

[0006] The above-mentioned objectives of this invention can be achieved by the following technical solutions: This invention provides a medium-to-large bar production system, comprising:

[0007] A bar processing line, comprising a plurality of bar processing units arranged sequentially along the bar conveying direction;

[0008] A large bar processing line, wherein the large bar processing line is arranged in parallel with the medium bar processing line, and the large bar processing line includes a plurality of large bar processing units arranged sequentially along the bar conveying direction;

[0009] A front-end shared production line connects the medium bar processing line and the large bar processing line. The front-end shared production line is used to transport processed bars to the medium bar processing line or the large bar processing line.

[0010] A rear shared production line connects the medium bar processing line and the large bar processing line. The rear shared production line is used to process and output the bars input from the medium bar processing line or the large bar processing line.

[0011] In a preferred embodiment of the present invention, the large bar processing line is arranged side by side with at least a portion of the medium bar processing line, and the connection direction of the large bar processing line and the rear shared production line is opposite to the connection direction of the medium bar processing line and the rear shared production line.

[0012] In a preferred embodiment of the present invention, the plurality of medium bar processing units include at least a waiting platform, a medium bar flying shear, a sizing and reducing unit, a medium bar cooling mechanism, a medium bar multiple length shear, a medium bar cooling bed, and a medium bar cutting mechanism arranged sequentially along the bar conveying direction.

[0013] In a preferred embodiment of the present invention, the central rod cooling mechanism includes a water-cooling device.

[0014] In a preferred embodiment of the present invention, the center bar cutting mechanism includes a center bar abrasive wheel saw.

[0015] In a preferred embodiment of the present invention, a plurality of the center bar abrasive wheel saws are provided, and the plurality of center bar abrasive wheel saws are arranged at intervals along the bar conveying direction.

[0016] In a preferred embodiment of the present invention, the plurality of large bar processing units include at least a grouping frame and a large bar cutting mechanism arranged sequentially along the bar conveying direction.

[0017] In a preferred embodiment of the present invention, the bar cutting mechanism includes a bar metal saw.

[0018] In a preferred embodiment of the present invention, the front shared production line includes a heating furnace, a billet mill, a hydraulic shear, a billet cooling bed, a continuous rolling mill, and a front multiple-length shear arranged sequentially along the bar conveying direction.

[0019] In a preferred embodiment of the present invention, the rear shared production line includes a fixed-length cooling machine collection device.

[0020] The technical solution of the present invention has the following significant beneficial effects:

[0021] When the medium and large bar production system described in this invention is used, the front shared production line is responsible for the preliminary processing of the bars, ensuring that the bars have the preset size and shape accuracy when they enter the medium or large bar processing line, thereby reducing the difficulty of subsequent processing and improving overall production efficiency. The rear shared production line is responsible for the final processing of the bars, ensuring that the finished bars output from the medium or large bar processing line meet the requirements.

[0022] Furthermore, by setting the medium bar processing line and the large bar processing line in parallel, mutual interference between the two lines is avoided. The medium bar processing line and the large bar processing line can share the front and rear shared production lines, reducing the need for redundant construction and thus significantly reducing the investment and construction costs of the production line.

[0023] Furthermore, by integrating the medium and large bar processing lines, the number of operators and maintenance personnel has been reduced, thereby lowering labor costs. The integrated medium and large bar production system can flexibly switch production modes according to market demand, improving the equipment utilization rate of the system and making it more aligned with the company's sustainable development goals. This also helps reduce carbon emissions and meet increasingly stringent environmental protection requirements.

[0024] Furthermore, the integrated medium and large bar production system can flexibly adjust production specifications according to market demand. Regardless of whether the market demand leans towards large or medium bars, the medium and large bar production system can quickly adjust to meet market demand, avoiding idle production lines and enhancing the company's market competitiveness. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0027] Figure 1 This is a schematic diagram of one embodiment of the medium and large bar production system described in this invention.

[0028] The reference numerals in the above figures are as follows:

[0029] 100. Medium bar processing line; 110. Waiting table; 120. Medium bar flying shear; 130. Sizing and reducing unit; 140. Medium bar cooling mechanism; 150. Medium bar multiple length shear; 160. Medium bar cooling bed; 170. Medium bar cutting mechanism;

[0030] 200. Large bar processing line; 210. Grouping frame; 220. Large bar cutting mechanism;

[0031] 300. Front-end shared production line; 310. Heating furnace; 320. Continuous rolling mill; 330. Front-end multiple-length shear;

[0032] 400. Rear shared production line; 410. Fixed-length cooling machine collection equipment. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please refer to the following: Figure 1As shown, an embodiment of the present invention provides a medium-to-large bar production system, which includes a medium bar processing line 100, a large bar processing line 200, a front shared production line 300, and a rear shared production line 400. The medium bar processing line 100 includes a plurality of medium bar processing units arranged sequentially along the bar conveying direction. The large bar processing line 200 is arranged in parallel with the medium bar processing line 100 and includes a plurality of large bar processing units arranged sequentially along the bar conveying direction. The front shared production line 300 connects the medium bar processing line 100 and the large bar processing line 200, and is used to convey processed bars to the medium bar processing line 100 or the large bar processing line 200. The rear shared production line 400 connects the medium bar processing line 100 and the large bar processing line 200, and is used to process and output the bars input from the medium bar processing line 100 or the large bar processing line 200.

[0035] Overall, in use, the front shared production line 300 is responsible for the preliminary processing of the bars, ensuring that the bars have the preset dimensional and shape accuracy when they enter the medium bar processing line 100 or the large bar processing line 200. This helps reduce the difficulty of subsequent processing and improves overall production efficiency. The rear shared production line 400 is responsible for the final processing of the bars, ensuring that the finished bars output from the medium bar processing line 100 or the large bar processing line 200 meet the requirements.

[0036] By arranging the medium bar processing line 100 and the large bar processing line 200 in parallel, mutual interference between them is avoided. Furthermore, the medium bar processing line 100 and the large bar processing line 200 can share the front shared production line 300 and the rear shared production line 400, reducing the need for redundant construction and thus significantly lowering the investment and construction costs of the production lines. In addition, integrating the medium bar processing line 100 and the large bar processing line 200 also reduces the number of operation and maintenance personnel, thereby lowering labor costs.

[0037] The integrated medium and large bar production system can flexibly switch production modes according to market demand, improving equipment utilization and aligning it better with the company's sustainable development goals. It also helps reduce carbon emissions to meet increasingly stringent environmental requirements. The integrated system can flexibly adjust production specifications based on market demand, quickly adapting to meet varying market needs, whether for large or medium bars, thus avoiding idle production lines and enhancing market competitiveness.

[0038] Standalone medium-sized bar production lines are typically limited by small-sized billets, resulting in relatively low compression ratios that affect product strength and uniformity. The medium-to-large bar production system described in this invention can flexibly utilize billets of different specifications; for example, medium-sized bars can be rolled from large-sized billets, increasing the compression ratio and thus resulting in a denser product structure and superior mechanical properties.

[0039] Existing large bar rolling processes have low precision and poor surface quality, requiring more subsequent processing steps to improve quality. The medium and large bar production system described in this invention enables precision rolling and better temperature control, resulting in round bar products with higher surface quality, reduced surface defects (such as cracks, oxide scale, etc.), and lower requirements for subsequent turning and polishing.

[0040] This invention optimizes the process flow and combines technologies such as controlled rolling and cooling, precision rolling, and high compression ratio to make the finished product superior to products from individual production lines in terms of dimensional accuracy, mechanical properties, microstructure uniformity, and surface quality. This reduces the need for subsequent processing and improves the stability and consistency of the overall product quality.

[0041] In an embodiment of the present invention, the large bar processing line 200 and at least a portion of the medium bar processing line 100 are arranged side by side, and the connection direction of the large bar processing line 200 and the rear shared production line 400 is opposite to the connection direction of the medium bar processing line and the rear shared production line 400.

[0042] By feeding large and medium bars into the shared rear production line 400 from opposite directions, potential spatial conflicts and mutual interference between the two production lines during transport are avoided. Furthermore, by arranging the large bar processing line 200 and the medium bar processing line 100 side-by-side in a reverse configuration, the overall layout of the large and medium bar production system is more compact, saving factory space, improving land utilization, and facilitating equipment management and maintenance.

[0043] In an embodiment of the present invention, the plurality of medium bar processing units include at least a waiting platform 110, a medium bar flying shear 120, a sizing and reducing unit 130, a medium bar cooling mechanism 140, a medium bar multiple length shear 150, a medium bar cooling bed 160, and a medium bar cutting mechanism 170 arranged sequentially along the bar conveying direction.

[0044] The temperature-controlled platform 110 is used to stabilize the temperature of the bar stock, ensuring uniform temperature before entering subsequent processes and avoiding processing defects caused by temperature fluctuations. This helps improve the quality of the bar stock and reduce the scrap rate. The bar stock flying shear 120 can quickly and accurately cut the head and tail of the bar stock, facilitating subsequent rolling processes. It can also promptly break the bar stock in case of accidents in subsequent processing equipment, preventing further escalation of the accident.

[0045] The reducing and sizing mill 130, through multiple rolling passes, brings the intermediate bars to the required precise dimensions and shape, improving the dimensional accuracy of the finished intermediate bars and enhancing their surface quality, ensuring compliance with industry standards. The intermediate bar cooling mechanism 140 cools the intermediate bars, ensuring they maintain good microstructure and mechanical properties during cooling, reducing internal stress, and preventing deformation, thereby improving the mechanical properties of the finished intermediate bar products.

[0046] The 150 medium bar shear is used to precisely cut cooled medium bars to a preset length, ensuring that each section of medium bar is of consistent length. The 160 medium bar cooling bed is used for cooling and conveying medium bars, and has automatic tilting and unloading functions to ensure that the medium bars do not stick together or deform during the cooling process, thereby improving cooling efficiency, reducing manual operation, and lowering labor intensity.

[0047] The bar cutting mechanism 170 is used for the final cutting of the bar stock to the specified length, ensuring a smooth and flat cut surface free of burrs and cracks, thus improving the appearance quality of the bar stock products.

[0048] Furthermore, existing water cooling methods may result in different cooling rates between the core and the surface, causing thermal stress and affecting the quality of the finished product. In this invention, a waiting-heating platform 110 is used instead of traditional water cooling, which makes the temperature drop of the intermediate bar product more uniform, reduces problems such as quenching cracks, internal residual stress, and uneven microstructure, and the air cooling temperature is easier to control, providing intermediate rolled pieces with more precise temperature for finished product rolling, which is beneficial to improving the overall performance of the product.

[0049] From the warming platform 110 to the bar cutting mechanism 170, the various bar processing units work together to ensure the smooth operation of the entire production process. The complementary functions of each bar processing unit form a highly efficient production line, greatly improving the production efficiency and product quality of bar stock.

[0050] Designers may adjust the specific model and structure of the waiting platform 110, the medium bar flying shear 120, the sizing and reducing unit 130, the medium bar cooling mechanism 140, the medium bar multiple length shear 150, the medium bar cooling bed 160, and the medium bar cutting mechanism 170 according to the needs of use, without making specific restrictions here.

[0051] Preferably, the bar cooling mechanism 140 includes a water-cooling device. The water-cooling device directly applies high-pressure water to the surface of the high-temperature bar, rapidly removing heat and achieving rapid cooling. Compared to traditional air cooling or wind cooling methods, the water-cooling device can significantly shorten cooling time and improve cooling efficiency. Furthermore, during the water-cooling process, the water-cooling device can employ multiple water tanks arranged at intervals, thereby avoiding internal stress concentration and crack formation caused by excessive supercooling. This helps improve the internal microstructure of the bar and enhance its mechanical properties, such as strength, toughness, and hardness.

[0052] Because water-cooling devices can complete cooling in a short time, they reduce the exposure time of the bars at high temperatures, effectively preventing oxidation and decarburization, maintaining the surface smoothness and chemical consistency of the bars, and improving the product's appearance quality and corrosion resistance. Furthermore, most water-cooling devices use a closed-loop system, allowing the treated cooling water to be reused, reducing water waste and discharge.

[0053] Designers can adjust the specific structure of the water-cooling device according to their needs, without imposing specific restrictions. The water-cooling device is typically equipped with adjustable nozzles and a flow control system, which allows for flexible adjustment of the cooling water pressure and flow rate according to different bar specifications and process requirements, thereby ensuring optimal cooling for each bar.

[0054] Furthermore, water cooling devices are typically equipped with temperature sensors and automatic control systems, which can monitor the temperature changes of the bars in real time and automatically adjust the cooling parameters as needed, improving production stability and reducing the risk of manual intervention.

[0055] More preferably, the bar cutting mechanism 170 includes a bar abrasive wheel saw. The bar abrasive wheel saw provides high-precision cutting, ensuring consistent cutting length and end-face flatness for each bar. By adjusting the saw blade speed and feed rate, precise cutting of bars of different specifications can be achieved. The bar abrasive wheel saw is suitable for bars of various hardness and materials, such as spring steel, alloy steel, and stainless steel. The flexibility and durability of the bar abrasive wheel saw enable this cutting method to meet the low-temperature sawing requirements of different materials and adapt to the needs of multi-variety, small-batch production.

[0056] Furthermore, medium-sized bar saws are typically equipped with automatic control systems that can automatically complete cutting tasks according to preset parameters, improving production efficiency and stability. Because the cutting process of medium-sized bar saws is highly controllable and stable, the results of each cut are very consistent, ensuring the consistency and reliability of medium-sized bar product quality during mass production.

[0057] Furthermore, multiple center bar saws are provided, arranged at intervals along the bar conveying direction. By arranging multiple center bar saws at intervals along the conveying direction, simultaneous cutting can be performed, greatly improving cutting speed and production efficiency. Compared to a single saw, multiple center bar saws can significantly increase sawing output, thus better meeting the needs of mass production.

[0058] Designers can adjust the number and arrangement of the center bar abrasive wheel saws according to usage needs; no specific restrictions are imposed here. For example, two, three, or other quantities of center bar abrasive wheel saws can be used.

[0059] Among them, online controlled rolling and cooling is mainly reflected in the use of a reducing and sizing mill 130 for precision rolling, and the installation of a bar cooling mechanism 140 before and after the reducing and sizing mill 130 to control the rolling temperature and post-rolling temperature of the final rolling reducing and sizing mill 130, thereby achieving low-temperature fine-grain rolling and improving the internal microstructure of the product.

[0060] In an embodiment of the present invention, the plurality of large bar processing units include at least a grouping frame 210 arranged sequentially along the bar conveying direction and a large bar cutting mechanism 220.

[0061] The grouping frame 210 allows for precise arrangement and fixation of large bars, ensuring that each bar is in the optimal position when entering the large bar cutting mechanism 220. This improves cutting accuracy, reduces scrap rates due to bar position deviations, and enhances product quality. Furthermore, the grouping frame 210 can flexibly adjust the bar arrangement according to different production process requirements, accommodating the processing needs of large bars of varying specifications and lengths.

[0062] A complete automated large bar production line is formed by sequentially arranging the grouping frame 210 and the large bar cutting mechanism 220 along the conveying direction. Before entering the cutting process, the large bars undergo pre-processing (such as arrangement and alignment) on the grouping frame 210 to ensure accurate positioning when entering the large bar cutting mechanism 220. This continuous automated process greatly improves the production efficiency of large bars and shortens the processing cycle.

[0063] Designers may adjust the specific structure of the grouping frame 210 and the bar cutting mechanism 220 according to the needs of use, without making specific restrictions here.

[0064] Preferably, the large bar cutting mechanism 220 includes a large bar metal saw. The large bar metal saw provides high-precision cutting, ensuring consistent cutting length and end-face flatness for each bar. By adjusting the saw blade speed and feed rate, precise cutting of bars of different specifications can be achieved. The large bar metal saw is suitable for bars of various hardness and materials, such as carbon steel, alloy steel, and stainless steel. The flexibility and durability of the large bar metal saw allow this cutting method to meet the high-temperature sawing requirements of different materials and adapt to the needs of multi-variety, small-batch production.

[0065] Furthermore, large bar metal saws are typically equipped with automatic control systems that can automatically complete cutting tasks according to preset parameters, improving production efficiency and stability. Because the cutting process of large bar metal saws is highly controllable and stable, the results of each cut are very consistent, ensuring the consistency and reliability of large bar product quality during mass production.

[0066] In an embodiment of the present invention, the front shared production line 300 includes a heating furnace 310, a billet mill, a hydraulic shear, a billet cooling bed, a continuous rolling mill 320, and a front multiple-length shear 330 arranged sequentially along the bar conveying direction. The heating furnace 310, billet mill, and continuous rolling mill 320 enable precise shape control of the bars, enhancing flexibility and reliability, ensuring that each bar is in optimal condition before entering the next process, improving the dimensional accuracy and surface quality of the bar products, and reducing the scrap rate.

[0067] In an embodiment of the present invention, the rear shared production line 400 includes a fixed-length cooling machine collection device 410. The fixed-length cooling machine collection device 410 can provide a uniform cooling environment for the bars, ensuring that the temperature distribution of each bar is uniform during the cooling process. This helps to reduce thermal stress and deformation caused by inconsistent cooling rates, and improves the dimensional accuracy and mechanical properties of the bar products.

[0068] The heating furnace 310 is designed to accommodate the heating needs of large billets required for main bars and small billets required for intermediate bars. Furthermore, large billets can also be used in the intermediate bar production process to produce intermediate bars with higher compression ratios and better microstructure.

[0069] The billet mill, a shared primary rolling unit for both the large bar processing line 200 and the medium bar processing line 100, is responsible for providing appropriately sized rolled pieces to the continuous rolling mill 320. When producing large square billets, the billet mill independently completes the rolling task, followed by length shearing using hydraulic shears, and then transports the rolled pieces to the billet cooling bed for cooling and collection.

[0070] In the production of large bar products, the continuous rolling mill 320 undertakes the final rolling task, capable of rolling large round and square bars. In the production of medium bar products, the continuous rolling mill 320 provides the intermediate rolled pieces required for subsequent processes. Considering that the intermediate rolled pieces for medium bars are relatively small in size and long in length, which could lead to an excessively long waiting stand 110, a front-end multiple-length shear 330 is installed after the continuous rolling mill 320 to segment the intermediate rolled pieces so that they can be fed separately into the waiting stand 110.

[0071] After the intermediate products of medium-sized bars undergo multiple-length shearing, a grouping stand 210 and a warming stand 110 are set up, both sharing a set of input roller conveyors. Large bars, due to their larger size, lower speed, and lack of multiple-length shearing, enter the grouping stand 210 after being decelerated and braked by the roller conveyor; while the intermediate rolled pieces of medium-sized bars, with higher speeds and requiring multiple-length shearing, enter the warming stand 110 after being braked by a skirt plate. This area separates the subsequent processes for large and medium-sized bars into two separate process routes, which are then operated separately.

[0072] After being quickly grouped in the grouping stand 210, the large bar products enter the sawing roller conveyor of the large bar metal saw, where they are finally cut to length using the large bar metal saw, and then enter the length-cutting area of ​​the length-cutting cooling bed collection device 410.

[0073] Intermediate bars are air-cooled on the cooling stand 110 until they reach the required temperature for the reducing and sizing mill 130 before being rolled. The cooling stand 110 is equipped with a fast-pass trolley, allowing bars that do not require air cooling to quickly pass through the cooling stand 110 and enter the reducing and sizing mill 130. Compared with traditional water-cooling devices, the cooling stand 110 achieves a more uniform cooling effect while saving energy.

[0074] After leaving the intermediate bar cooling stand 110, the bar enters the reducing and sizing mill 130 for final rolling. The finished bar then enters a water-cooling device (water tank) for controlled cooling after rolling, followed by long-length shearing. After shearing, it enters the intermediate bar cooling bed 160 for further cooling and temperature control. After leaving the intermediate bar cooling bed 160, the bar enters the abrasive wheel sawing area of ​​the intermediate bar cutting mechanism 170 for length sawing, and then enters the transverse moving stand area.

[0075] After the large and medium bars are cut to length on their respective process routes, the subsequent collection process uses a set of equipment. The length-cooling machine collection equipment 410 can meet both the cooling requirements of the long bars and the lateral movement requirements of the medium bars. After passing through the length-cooling machine collection equipment 410, the bars enter the bundling, collection, and warehousing process to complete the entire process.

[0076] Furthermore, this invention also discloses a process for producing steel of different specifications, specifically including:

[0077] Specific Implementation Example 1: Using billets with dimensions of 400mm high × 500mm wide × 6m long, large square steel bars of 200mm × 200mm, large round steel bars of 145mm diameter, and medium round steel bars of 80mm diameter are produced. The length of both the assembly stand 210 and the waiting stand 110 is 78m.

[0078] Specific Implementation Example 2: In the production of square steel, the final product is completed at the billet mill. The billet is rolled 13 times by reciprocating rolling in the billet mill to form 200mm×200mm square steel. Afterwards, it is cut to length by hydraulic shears, and the cut square steel is sent to the billet cooling bed for cooling and collection.

[0079] Specific Implementation Example 3: When producing φ145mm round steel bars, the steel is first rolled 13 times in a billet mill to produce 220mm×220mm square steel intermediate pieces; then it enters the continuous rolling mill 320 and is rolled 4 times in the continuous rolling mill 320 to produce φ145mm round steel bars. At this time, the total length of the rolled pieces is 73m.

[0080] After rolling, without cutting to multiple lengths, the rolls pass through the pre-roller brake of the grouping stand 210 and enter the grouping stand 210 for grouping. After two rolled pieces are grouped on the grouping stand 210, they enter the metal sawing area of ​​the large bar metal saw for fixed-length sawing, with a fixed length of 6m. The rolled pieces after fixed-length sawing are sequentially sent to the fixed-length cooling bed machine collection equipment 410 for cooling. After cooling, they enter the subsequent collection process, completing the entire production process of the large bar.

[0081] Specific Implementation Example 4: When producing φ80mm round bars, the steel is first rolled 13 times in a billet mill to produce 200mm×200mm square steel intermediate pieces; then it enters the continuous rolling mill 320 and is rolled 8 times in the continuous rolling mill 320 to produce φ110mm intermediate round steel pieces. At this time, the total length of the pieces is 126m.

[0082] After continuous rolling, the rolled stock is sheared into two 63m long multiple-length rolled pieces, each 78m shorter than the length of the waiting stand 110. At this point, the stock temperature is approximately 1000℃. Using a skirt brake, the multiple-length rolled pieces are then air-cooled on the waiting stand 110 until the temperature drops to 800℃. The pieces are then individually fed into the reduction and sizing mill 130 for final rolling, ultimately producing φ80mm round bars. After completion, the rolled piece is cooled by a water-cooling device to control its temperature, then sheared to multiple lengths, and then cooled on the bar cooling bed 160. After cooling on the bar cooling bed 160, the rolled piece enters the abrasive wheel sawing area of ​​the bar cutting mechanism 170 for fixed-length sawing, and is finally cut into fixed-length products with a length of 6m. The cut rolled piece enters the fixed-length cooling bed machine collection device 410 for transverse movement, and then enters the subsequent collection process to complete the entire production process of the bar.

[0083] Of course, in other feasible embodiments, designers may adjust the specific production process according to production needs, and no specific restrictions are imposed here.

[0084] The technical solution of this invention, by integrating the large bar processing line and the medium bar processing line, brings the following significant effects:

[0085] (1) Reduce investment costs: By sharing key equipment such as heating furnace 310, billet mill and continuous rolling mill 320, the company has reduced redundant investment and significantly reduced capital expenditure.

[0086] (2) Improve production efficiency: The medium and large bar production system can flexibly switch between producing large and medium bars, which improves the utilization rate of equipment and reduces the idle time caused by the specialization of production lines.

[0087] (3) Improve product quality: By adopting controlled rolling and cooling technology, more precise rolling temperature and cooling control are achieved, which improves the dimensional accuracy and internal structure properties of the products;

[0088] (4) Energy saving and consumption reduction: The medium bar production line adopts the 110 waiting platform to replace the traditional water cooling device and uses air cooling to control the temperature, which saves energy consumption and reduces production costs.

[0089] (5) Enhanced market adaptability: The increased flexibility of the production line enables it to respond quickly to market changes and adapt to the needs of different product specifications, thereby enhancing the company's market competitiveness;

[0090] (6) Reduce environmental impact: By optimizing the process flow and reducing energy consumption, carbon emissions and other environmental impacts in the production process are reduced, which helps the company's sustainable development;

[0091] (7) Reduced maintenance costs: Because shared equipment reduces the total number of devices, maintenance costs and operational complexity are reduced;

[0092] (8) Improve production flexibility: The production line can quickly adjust the production plan according to market demand and produce products of different specifications, thus improving the response speed to market changes.

[0093] (9) Reduce raw material waste: By optimizing the selection of billets and controlling the compression ratio, the waste of raw materials is reduced and the material utilization rate is improved;

[0094] (10) Low cost of technology update and upgrade: Due to the integration of production lines, the application and upgrading of new technologies can be completed on one production line, reducing the cost of research and development and transformation.

[0095] In summary, this invention not only improves production efficiency and product quality, but also reduces production costs and environmental impact, bringing both economic and environmental benefits to enterprises.

[0096] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0097] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A medium-to-large bar production system, characterized in that, include: A bar processing line, comprising a plurality of bar processing units arranged sequentially along the bar conveying direction; A large bar processing line, wherein the large bar processing line is arranged in parallel with the medium bar processing line, and the large bar processing line includes a plurality of large bar processing units arranged sequentially along the bar conveying direction; A front-end shared production line connects the medium bar processing line and the large bar processing line. The front-end shared production line is used to transport processed bars to the medium bar processing line or the large bar processing line. A rear shared production line connects the medium bar processing line and the large bar processing line. The rear shared production line is used to process and output the bars input from the medium bar processing line or the large bar processing line.

2. The medium and large bar production system as described in claim 1, characterized in that, The large bar processing line is arranged side by side with at least part of the medium bar processing line, and the connection direction of the large bar processing line and the rear shared production line is opposite to the connection direction of the medium bar processing line and the rear shared production line.

3. The medium and large bar production system as described in claim 1, characterized in that, The plurality of medium bar processing units include at least a waiting platform, a medium bar flying shear, a sizing and reducing unit, a medium bar cooling mechanism, a medium bar multiple-length shear, a medium bar cooling bed, and a medium bar cutting mechanism arranged sequentially along the bar conveying direction.

4. The medium and large bar production system as described in claim 3, characterized in that, The cooling mechanism for the central rod includes a water-cooling device.

5. The medium and large bar production system as described in claim 3, characterized in that, The central bar cutting mechanism includes a central bar abrasive wheel saw.

6. The medium and large bar production system as described in claim 5, characterized in that, Multiple central bar abrasive wheel saws are provided, and the multiple central bar abrasive wheel saws are arranged at intervals along the bar conveying direction.

7. The medium and large bar production system as described in claim 1, characterized in that, The plurality of large bar processing units include at least a grouping frame arranged sequentially along the bar conveying direction and a large bar cutting mechanism.

8. The medium and large bar production system as described in claim 7, characterized in that, The large bar cutting mechanism includes a large bar metal saw.

9. The medium and large bar production system as described in claim 1, characterized in that, The front shared production line includes a heating furnace, a billet mill, a hydraulic shear, a billet cooling bed, a continuous rolling mill, and a front multiple-length shear arranged sequentially along the bar conveying direction.

10. The medium and large bar production system as described in claim 1, characterized in that, The rear shared production line includes a fixed-length cooling machine collection device.

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