A steel coil flexible handling system and method of production thereof

Abstract

The present application belongs to the technical field of hot-rolled strip steel production, and relates to a steel coil flexible processing system and a production method thereof. The system comprises a steel coil uncoiling line, an oxidation-free furnace heat treatment line, an open flame furnace heat treatment line, a heat treatment return line, a finished product line and a heat treatment baling line. The center lines of the functional lines are arranged in parallel, and are connected through a transverse moving trolley, a steel plate transverse moving device, a transverse moving roller way, a stacking machine and a cooling bed, forming multiple annular processing material flow lines between the functional lines. The present application can use steel coils and / or steel plate stacks as raw materials, automatically allocate steel plate flow routes according to product delivery requirements, sequentially complete uncoiling, shot blasting, normalizing, tempering, quenching and tempering, straightening, surface inspection, sizing, stacking and baling and other processes, support multiple production modes such as ordinary uncoiled plate delivery, shot blasted plate delivery, normalized / tempered delivery and quenched and tempered delivery, and solve the problems of single function, fixed material flow route and low equipment utilization rate of traditional production lines.

Description

Technical Field

[0001] This invention belongs to the field of hot-rolled strip steel production technology, and relates to a flexible steel coil processing system and its production method. Background Technology

[0002] Hot-rolled steel coils are the primary product of hot-rolled strip steel production, and end users often input them into reprocessing processes in the form of plates. Before reprocessing, the steel coils need to undergo straightening, slitting, shot blasting, and other treatments according to the user's requirements. To improve the overall mechanical properties of the steel plates, appropriate heat treatments, such as normalizing, quenching and tempering, and tempering, are also required. To enhance the economic value of primary steel coils, meet the needs of users for various applications, and provide users with raw material steel plates that closely match their requirements, designing a flexible steel coil processing system based on user needs has significant economic value.

[0003] In existing technologies, steel coil post-processing production lines typically employ a rigid layout with single functions and fixed logistics routes, with each functional section operating independently. This rigid layout presents the following problems: First, the production line can only execute fixed processing flows and cannot flexibly adjust processing routes according to the diverse requirements of user orders; second, key equipment such as heating furnaces, shot blasting machines, and straightening machines are independent of each functional section, resulting in low equipment utilization and high idle rates; third, the production line can usually only accept a single type of raw material (such as accepting only steel coils or only steel plate stacks), and cannot simultaneously accommodate multiple feeding forms; fourth, for processes requiring two furnace passes, such as heat treatment, traditional production lines struggle to achieve efficient material turnover within the same system.

[0004] Therefore, it is necessary to design a flexible steel coil handling system with a high degree of automation, flexible logistics, and high equipment utilization to meet the diverse delivery needs of high value-added steel plates and achieve unmanned production. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a flexible steel coil processing system and its production method. The system forms multiple circular processing logistics lines by setting up a variety of lateral transfer devices between functional lines, so that steel plates can be transferred between functional lines as needed according to product delivery requirements, thereby realizing flexible operation of the production line and efficient utilization of key equipment, so as to solve the problems of single function, fixed logistics route and low equipment utilization rate of steel coil post-processing production lines in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A flexible steel coil handling system includes: A steel coil leveling line is used to uncoil, straighten, slit, and stack steel coils to form steel plate stacks. The oxidation-free furnace heat treatment line is used for shot blasting, oxidation-free heating, quenching and cooling of single steel plates; The open flame furnace heat treatment line is used for shot blasting, open flame heating, and cooling of single steel plates; The heat treatment return line is used to realize the lateral transfer and return of steel plates between the above-mentioned heat treatment lines; Finished product line, used for straightening, surface inspection, length cutting, stacking and / or bundling of steel plates; Heat treatment bundling line, used for stacking and bundling heat-treated steel plates; The functional lines are connected by traversing trolleys, steel plate traversing devices, traversing roller conveyors, stackers and / or cooling beds, forming multiple circular processing logistics lines between the functional lines, enabling steel plates to flow between the functional lines as needed according to product delivery requirements; the system can process steel coils and / or steel plate stacks as raw materials.

[0007] Furthermore, the center lines of the non-oxidizing furnace heat treatment line, the open flame furnace heat treatment line, the heat treatment return line, the finished product line, the heat treatment bundling line, and the coil leveling line are arranged in parallel.

[0008] Furthermore, the end of the coil leveling line is connected to the finished product line via a first lateral trolley to transfer the leveled steel plate stacks to the finished product line; the finished product line is connected to the furnace loading platform of the non-oxidizing furnace heat treatment line via a second lateral trolley; the finished product line is connected to the furnace loading platform of the open flame furnace heat treatment line via a third lateral trolley; the steel plate stacks are transferred between the leveling line, the finished product line, and each heat treatment line via the aforementioned lateral trolleys, providing steel plate stacks to be processed for the heat treatment lines; the roller conveyor behind the shot blasting machine of the non-oxidizing furnace heat treatment line and the roller conveyor behind the shot blasting machine of the open flame furnace heat treatment line are both connected to the roller conveyor of the heat treatment return line via a steel plate lateral transfer device, forming a lateral passage between the non-oxidizing furnace heat treatment line, the open flame furnace heat treatment line, and the heat treatment return line, realizing the lateral flow of the shot-blasted steel plates between the three lines.

[0009] Furthermore, the heat treatment return line and the finished product line are connected by a first stacker and a transverse roller conveyor; the first stacker is used to transversely move single steel plates from the heat treatment return line to the finished product line for stacking; the transverse roller conveyor is used to transversely move single steel plates or steel plate stacks between the finished product line and the heat treatment return line; the finished product line and the heat treatment bundling line are connected by a second stacker, and the steel plates that have been straightened and cut to length after heat treatment are transversely moved by the second stacker to the heat treatment bundling line to complete stacking and bundling.

[0010] Furthermore, the non-oxidizing furnace heat treatment line includes a first depalletizer, a first shot blasting machine, a non-oxidizing heating furnace, a quenching machine, and a cooling bed arranged sequentially along the material flow direction; the open flame furnace heat treatment line includes a second depalletizer, a second shot blasting machine, an open flame heating furnace, and a cooling bed arranged sequentially along the material flow direction; the finished product line includes a stacking and loading roller conveyor and a cooling bed, a first straightener, a surface inspection station, a second straightener, a fixed-length shear, and a first bundling machine arranged sequentially along the material flow direction; and the second stacker is arranged between the fixed-length shear and the first bundling machine.

[0011] Furthermore, the first stacker on the heat treatment return line and the second stacker on the finished product line are interconnected via the heat treatment return line and the transverse roller conveyor to form a functional backup relationship. When one stacker fails, the other stacker can take over to complete the stacking operation.

[0012] The present invention also provides a production method based on the above-mentioned flexible steel coil processing system, which includes the following steps when steel coil is used as raw material: S1: The steel coil is fed into the steel coil leveling line, where it is uncoiled, straightened, cut and stacked in sequence to form a steel plate stack. S21: According to the product delivery requirements, the steel plate stack is transferred from the coil leveling line to the finished product line by the first transverse trolley, and then transferred to the furnace loading platform of the non-oxidizing furnace heat treatment line or the open flame furnace heat treatment line by the second transverse trolley. S22: Ordinary flat plate delivery mode: The steel coil is processed by the steel coil flat plate line to form a steel plate stack. The steel plate stack is transported to the finished product line by the first transverse trolley and directly bundled at the first bundling machine in the finished product line to form the finished product. S3: The unloading machine on the non-oxidizing furnace heat treatment line or the open flame furnace heat treatment line breaks the steel plate stack into individual steel plates, and the individual steel plates enter the corresponding shot blasting machine for surface shot blasting treatment. S4: Select one of the following processing paths based on product delivery requirements: Shot blasting path: After shot blasting, the steel plate is sent to the heat treatment return line via the steel plate transverse transfer device, then returned to the finished product line via the first stacker for stacking, and then bundled by the first bundling machine; Normalizing / Tempering Path: After shot blasting, the steel plate enters the heating furnace for normalizing or tempering heating. After cooling on the cooling bed, it enters the finished product line, where it undergoes straightening, surface inspection, and length cutting in sequence. After being stacked at the second stacker, it is sent to the heat treatment bundling line and bundled by the second bundling machine in the heat treatment bundling line. Tempering Path: After shot blasting, the steel plate enters the non-oxidizing heating furnace for heating and is then quenched by the quenching machine. After cooling on the cooling bed, it enters the finished product line and is transferred to the heat treatment return line via the transverse roller conveyor. It then returns to the non-oxidizing heating furnace for tempering via the steel plate transverse transfer device. After tempering, it is cooled on the cooling bed and enters the finished product line to complete straightening, surface inspection, and length cutting. After being stacked at the second stacker, it is sent to the heat treatment bundling line and bundled by the second bundling machine in the heat treatment bundling line.

[0013] Furthermore, in the normalizing / tempering path, normalizing heating is carried out in an open flame furnace or an oxidation-free furnace, and tempering heating is carried out in an open flame furnace or an oxidation-free furnace; after cooling, the steel plates enter the finished product line and are straightened by a straightening machine, inspected by a surface inspection station, and cut to length in sequence. After reaching the specifications required by the user, they are stacked and bundled.

[0014] Furthermore, in the tempering path, the quenched steel plate is directly straightened, surface inspected, and cut to length on the finished product line, and then transferred to the heat treatment return line by the transverse roller conveyor. It is then sent back to the non-oxidizing furnace heat treatment line by the roller conveyor trolley and the steel plate transverse conveyor device. Depending on the process requirements, it is selectively shot blasted again by the shot blasting machine or directly enters the non-oxidizing heating furnace for tempering.

[0015] The present invention also provides another production method based on the above-mentioned flexible steel coil processing system, which includes the following steps when using steel plate stacks as raw materials: S1: Externally sourced steel plate stacks are transported to the stack loading roller conveyor of the finished product line by a workshop crane; S2: According to the product delivery requirements, the steel plate stack is transferred to the furnace loading platform of the non-oxidizing furnace heat treatment line or the open flame furnace heat treatment line via the second transverse trolley. S3: The unloading machine on the non-oxidizing furnace heat treatment line or the open flame furnace heat treatment line breaks the steel plate stack into individual steel plates, and the individual steel plates enter the corresponding shot blasting machine for surface shot blasting treatment. S4: Select one of the following processing paths based on product delivery requirements: Shot blasting path: After shot blasting, the steel plate is sent to the heat treatment return line via the steel plate transverse transfer device, then returned to the finished product line via the first stacker for stacking, and then bundled by the first bundling machine; Normalizing / Tempering Path: After shot blasting, the steel plate enters the heating furnace for normalizing or tempering heating. After cooling on the cooling bed, it enters the finished product line, where it undergoes straightening, surface inspection, and length cutting in sequence. After being stacked at the second stacker, it is sent to the heat treatment bundling line and bundled by the second bundling machine in the heat treatment bundling line. Tempering Path: After shot blasting, the steel plate enters the non-oxidizing heating furnace for heating and is then quenched by the quenching machine. After cooling on the cooling bed, it enters the finished product line and is transferred to the heat treatment return line via the transverse roller conveyor. It then returns to the non-oxidizing heating furnace for tempering via the steel plate transverse transfer device. After tempering, it is cooled on the cooling bed and enters the finished product line to complete straightening, surface inspection, and length cutting. After being stacked at the second stacker, it is sent to the heat treatment bundling line and bundled by the second bundling machine in the heat treatment bundling line.

[0016] The beneficial effects of this invention are as follows: (1) By setting up transverse transfer equipment such as transverse trolleys, steel plate transverse transfer devices, transverse roller conveyors and stackers between each functional line, the present invention forms multiple ring-shaped processing logistics lines between each functional line, enabling steel plates to flexibly select processing routes according to different product delivery requirements, thus realizing flexible operation of the production line.

[0017] (2) Key equipment on each functional line (such as non-oxidizing heating furnace, open flame heating furnace, shot blasting machine, straightening machine, etc.) are shared through a circular logistics line. When the equipment on one functional line is in a waiting state, the material to be processed can be transferred to another functional line for processing, which improves the utilization rate of key equipment on each functional line.

[0018] (3) The system can process both steel coils and steel plate stacks as raw materials at the same time, which broadens the scope of application of the production line and meets the processing needs of materials from different sources.

[0019] (4) By setting up a heat treatment return line, the present invention enables the two furnace treatments of "quenching-tempering" in the heat treatment process to be completed efficiently in the same system without having to transport the materials out of the production line for turnover, which significantly improves the production efficiency of heat treatment.

[0020] (5) The production line is seamlessly connected to each other, making the operation flexible and efficient. It can realize the fully automatic allocation of steel plate processing routes within the system and meet the requirements of unmanned production.

[0021] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the planar layout of a flexible steel coil processing system according to the present invention.

[0023] Attached reference numerals: K - Coil leveling line; K1 - Uncoiler; K2 - Straightening machine; K3 - Cross-cutting shear; K4 - Edge trimming shear; K5 - Third straightening machine; K6 - Fourth straightening machine; K7 - Flying shear; K8 - Stacking device; K9 - First transverse trolley; W - Non-oxidizing furnace heat treatment line; W1 - First unloading machine; W2 - First shot blasting machine; W3 - Non-oxidizing heating furnace; W4 - Quenching machine; W5 - First cooling bed; W6 - Second cooling bed; W7 - Third cooling bed; W8 - Furnace loading platform; W9 - Second transverse trolley; M - Open flame heat treatment line; M1 - Second unloading machine; M2 - Second shot blasting machine; M3 - Open flame heating furnace; M4 - Furnace loading platform; M5 - Third transverse trolley; R - Heat treatment return line; R1 - Steel plate transverse transfer device; R2 - First stacker; R3 - Roller conveyor trolley; C - Finished product line; C1 - Baler loading roller conveyor; C2 - First baler; C3 - Lateral roller conveyor; C4 - Length shear; C5 - Second straightener; C6 - Surface inspection station; C7 - First straightener; C8 - Fourth cooling bed; D - Heat treatment bundling line; D1 - Second bundling machine; D2 - Second stacker. Detailed Implementation

[0024] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] like Figure 1 As shown, the present invention provides a flexible steel coil processing system comprising six functional lines: a coil leveling line K, a non-oxidizing furnace heat treatment line W, an open flame furnace heat treatment line M, a heat treatment return line R, a finished product line C, and a heat treatment bundling line D. These six functional lines are arranged in parallel along their centerlines, and are connected to each other by various lateral transfer devices, forming multiple circular processing logistics lines between the functional lines.

[0028] The composition and working principle of each function line are briefly explained below: The coil leveling line K consists of an uncoiler K1, a straightener K2, a cross-cutting shear K3, an edge trimming shear K4, a third straightener K5, a fourth straightener K6, a flying shear K7, a stacking device K8, a first traverse trolley K9, and roller conveyors. Its working process is as follows: the steel coil is hoisted from the workshop to the loading position of the coil leveling line K; the uncoiler K1 unwinds the coil; the straightener K2 straightens and leads out the coil; the cross-cutting shear K3 and the edge trimming shear K4 respectively cut the steel plate laterally and longitudinally to achieve the required width; the third straightener K5 and the fourth straightener K6 straighten the steel plate to eliminate shape defects; the flying shear K7 cuts the continuously moving steel plates to a set length; the stacking device K8 neatly stacks the cut individual steel plates to form a steel plate stack; finally, the first traverse trolley K9 transfers the steel plate stack laterally to an adjacent functional line.

[0029] The oxidation-free furnace heat treatment line W consists of a first destabilizer W1, a first shot blasting machine W2, an oxidation-free heating furnace W3, a quenching machine W4, a first cooling bed W5, a second cooling bed W6, a third cooling bed W7, an inlet frame W8, a second transverse trolley W9, and roller conveyors. The working process is as follows: Steel plate stacks are transported to the inlet frame W8 by the second transverse trolley W9. The first destabilizer W1 breaks the stack into individual steel plates. Each individual steel plate is then subjected to shot blasting by the first shot blasting machine W2 to remove surface oxide scale and rust, and then enters the oxidation-free heating furnace W3 for heating. The oxidation-free heating furnace heats the steel plates under a protective atmosphere, effectively preventing the formation of new oxide scale during high-temperature heating and ensuring the surface quality of the steel plates. According to process requirements, the heated steel plates can be rapidly cooled by the quenching machine W4 (for the quenching process in tempering), or directly sent to the cooling bed for air cooling without quenching (for normalizing or tempering processes). The cooling system includes a first cooling bed W5, a second cooling bed W6, and a third cooling bed W7. One or more cooling beds can be used in series for cooling as needed. The cooled steel plates then enter the finished product line C via roller conveyors for further processing.

[0030] The open-flame furnace heat treatment line M consists of a second unloading machine M1, a second shot blasting machine M2, an open-flame heating furnace M3, an inlet platform M4, a third transverse trolley M5, and roller conveyors. Its operation is similar to that of the non-oxidizing furnace heat treatment line W: the steel plate stack is transported to the inlet platform M4 by the second transverse trolley W9. The second unloading machine M1 breaks the stack into individual steel plates, which then enter the second shot blasting machine M2 for surface shot blasting treatment, and then enter the open-flame heating furnace M3 for heating. The open-flame heating furnace uses direct flame heating, suitable for steel plates with relatively low surface quality requirements or those requiring subsequent shot blasting. After heating, the steel plates are cooled on a cooling bed and then enter the finished product line C for further processing.

[0031] The heat treatment return line R consists of a steel plate transverse transfer device R1, a first stacker R2, a roller conveyor trolley R3, and roller conveyors. The heat treatment return line R is a key functional line for achieving flexible logistics in this invention, with three main functions: First, the steel plate transverse transfer device R1 connects to the roller conveyors behind the shot blasting machines of the non-oxidizing furnace heat treatment line W and the open flame furnace heat treatment line M, forming a transverse passage and enabling the transverse flow of steel plates between the three lines; second, the first stacker R2 transversely moves single steel plates from the heat treatment return line to the finished product line C for stacking; third, the cooperation of the roller conveyor trolley R3 and the transverse roller conveyor C3 enables bidirectional transfer of steel plates between the finished product line C and the heat treatment return line R, particularly supporting the reheating and turnover of steel plates in the tempering process.

[0032] Finished product line C consists of a stacking and loading roller conveyor C1, a first bundling machine C2, a transverse roller conveyor C3, a length cutter C4, a second straightener C5, a surface inspection station C6, a first straightener C7, a fourth cooling bed C8, and roller conveyors. Its working process is as follows: heat-treated steel plates from the heat treatment line enter finished product line C via the cooling bed. They are first straightened by the first straightener C7 to eliminate deformation generated during heat treatment. Then, the surface quality of the steel plates is inspected at the surface inspection station C6 to determine whether secondary straightening by the second straightener C5 is necessary. Finally, the length cutter C4 cuts the steel plates to the required dimensions. The cut-to-length steel plates can be transversely moved by the second stacker D2 to the heat treatment bundling line D for stacking and bundling, or they can be transferred via the transverse roller conveyor C3 in conjunction with the roller conveyor trolley R3 to the first stacker R2 for direct stacking on finished product line C, followed by bundling by the first bundling machine C2. The finished product line C is also equipped with a stacking and loading roller conveyor C1, which can directly receive external steel plate stacks transported by the workshop overhead crane as raw materials for subsequent processing.

[0033] The heat treatment bundling line D consists of a second bundling machine D1, a second stacker D2, and roller conveyors. Its function is to receive steel plates after heat treatment and finished product line processing. The second stacker D2 completes the neat stacking of steel plates, and then the second bundling machine D1 bundles and packages the steel plate stacks to form the final finished steel plate bundles, which are then hoisted to the finished product area for storage by the workshop overhead crane.

[0034] The above six functional lines are connected and materials are transferred between them through the following lateral transfer equipment: (1) The first transverse trolley K9 connects the end of the coil leveling line K and the feed end of the finished product line C, and is used to transfer the leveled steel plate stack from the coil leveling line K to the finished product line C.

[0035] (2) The second transverse trolley W9 connects the furnace loading platform W8 of the finished product line C and the non-oxidizing furnace heat treatment line W, and is used to transfer the steel plate stack from the finished product line C to the non-oxidizing furnace heat treatment line W.

[0036] (3) The third transverse trolley M5 connects the furnace loading platform M4 of the finished product line C and the open flame furnace heat treatment line M, and is used to transfer the steel plate stack from the finished product line C to the open flame furnace heat treatment line M.

[0037] (4) The steel plate transverse transfer device R1 is connected to the roller conveyor behind the shot blasting machine of the non-oxidizing furnace heat treatment line W, the roller conveyor behind the shot blasting machine of the open flame furnace heat treatment line M, and the roller conveyor of the heat treatment return line R, forming a transverse passage between the three lines, so as to realize the transverse flow of the steel plate after shot blasting between the non-oxidizing furnace heat treatment line, the open flame furnace heat treatment line and the heat treatment return line.

[0038] (5) The first stacker R2 is connected to the heat treatment return line R and the finished product line C, and is used to move the single steel plate on the heat treatment return line to the finished product line C for stacking.

[0039] (6) The transverse roller conveyor C3 is set on the finished product line C and connected to the heat treatment return line R. It is used to transversely move a single steel plate or a stack of steel plates between the finished product line C and the heat treatment return line R.

[0040] (7) The second stacker D2 connects the finished product line C and the heat treatment bundling line D. It is set between the fixed length shear C4 and the first bundling machine C2 and is used to move the steel plates after fixed length on the finished product line to the heat treatment bundling line D for stacking.

[0041] (8) The first cooling bed W5, the second cooling bed W6, the third cooling bed W7 and the fourth cooling bed C8 form a cooling channel connection between the non-oxidizing furnace heat treatment line W and the finished product line C. The heat-treated steel plate can be cooled in sequence by these cooling beds and then enter the finished product line C.

[0042] The aforementioned lateral transfer equipment creates multiple circular processing logistics routes between the functional lines. "Circular" means that steel plates can start from one functional line, pass through several functional lines, and return to their original functional line or reach other functional lines, without needing to exit the production line in one direction. For example, steel plates on finished product line C can reach the heat treatment return line R via the lateral roller conveyor C3, then return to the non-oxidizing furnace heat treatment line W for tempering via the steel plate lateral transfer device R1, and after processing, can return to finished product line C via the cooling bed. This circular logistics structure is the core of achieving production line flexibility.

[0043] Furthermore, the first stacker R2 on the heat treatment return line R and the second stacker D2 on the finished product line C are interconnected via the heat treatment return line and the transverse roller conveyor C3, forming a functional backup relationship. Specifically, when the first stacker R2 fails, the steel plates on the heat treatment return line R can be transferred to the finished product line C via the transverse roller conveyor C3, and the stacking operation is completed by the second stacker D2; conversely, when the second stacker D2 fails, the steel plates that need to be stacked on the finished product line C can be transferred to the heat treatment return line R via the transverse roller conveyor C3, and the stacking operation is completed by the first stacker R2. This functional backup mechanism improves the reliability and continuous operation capability of the production line.

[0044] When this invention uses steel coils as raw materials, the following multiple production modes can be achieved: Mode 1: Standard tablet delivery This mode is suitable for ordinary flat products that only require straightening and slitting, without the need for heat treatment and shot blasting.

[0045] The specific process is as follows: Steel coils are hoisted from the raw material area by a workshop overhead crane to the steel coil leveling line K. They then sequentially pass through an uncoiler K1 for uncoiling, a straightener K2 for straightening, a cross-cutting shear K3 for cross-cutting, an edge trimming shear K4 for edge trimming, a third straightener K5 and a fourth straightener K6 for straightening, a flying shear K7 for fixed-length cutting, and a stacking device K8 for stacking, forming a steel plate stack. The steel plate stack is then transported to the finished product line C via the first transverse trolley K9. The roller conveyor on finished product line C directly conveys the steel plate stack to the first bundling machine C2 for bundling. Finally, a workshop overhead crane hoists the bundled finished steel plate stack to the finished product area. In this mode, the steel plates do not pass through any heat treatment line or shot blasting machine, resulting in the simplest material route.

[0046] Mode 2: Delivery of shot blasted plates This mode is suitable for steel plate products that require surface shot blasting, without the need for heat treatment.

[0047] The specific process is as follows: Steel coils are processed into steel plate stacks via the coil leveling line K (process is the same as in Mode 1). The steel plate stacks are then transported to the finished product line C via the first transverse trolley K9. Then, via the roller conveyor of finished product line C and the third transverse trolley M5, the steel plate stacks are transported to the furnace loading platform M4 of the open flame furnace heat treatment line M, or via the roller conveyor of finished product line C and the second transverse trolley W9 to the furnace loading platform W8 of the non-oxidizing furnace heat treatment line W. The choice of which heat treatment line to use can be flexibly determined based on the production load and equipment conditions of each heat treatment line.

[0048] Taking the open-flame furnace heat treatment line M as an example: the second unstacking machine M1 breaks down the steel plate stack into individual steel plates, which then enter the second shot blasting machine M2 for surface shot blasting treatment. After shot blasting, the steel plates are moved laterally by the steel plate traversing device R1 to the roller conveyor of the heat treatment return line R. The first stacking machine R2 then moves the individual steel plates laterally to the finished product line C for stacking. After being bundled by the first bundling machine C2, the finished steel plate stack is lifted to the finished product area by the workshop crane.

[0049] Taking the non-oxidizing furnace heat treatment line W as an example: The first destacking machine W1 breaks down the steel plate stack into individual steel plates, which then enter the first shot blasting machine W2 for surface shot blasting. After shot blasting, the steel plates are moved laterally by the steel plate traversing device R1 to the roller conveyor of the heat treatment return line R. The first stacking machine R2 then moves the individual steel plates laterally to the finished product line C for stacking. After being bundled by the first bundling machine C2, the finished steel plate stack is lifted to the finished product area by the workshop overhead crane.

[0050] The key to this model is that the steel plate after shot blasting is returned from the heat treatment line to the finished product line C through the steel plate transverse transfer device R1 and the heat treatment return line R, without having to go through a heating furnace and cooling process.

[0051] Mode 3: Delivery after heat treatment (normalizing / tempering) This mode is suitable for products where users need to perform normalizing or tempering heat treatment to improve the mechanical properties of steel plates.

[0052] The specific process is as follows: the steel coil is processed by the coil leveling line K to form a steel plate stack (the process is the same as in mode one), and the steel plate stack is transported to the finished product line C by the first transverse trolley K9. Then, according to the process selection, the steel plate stack is transported to the open flame furnace heat treatment line M or the non-oxidizing furnace heat treatment line W.

[0053] The route of the open-flame furnace heat treatment line M is as follows: Steel plate stacks are transported to the furnace loading platform M4 of the open-flame furnace heat treatment line M via the roller conveyor of the finished product line C and the third transverse trolley M5. The second unloading machine M1 breaks the steel plate stack into individual steel plates. Each individual steel plate undergoes surface shot blasting treatment in the second shot blasting machine M2, and then enters the open-flame heating furnace M3 for normalizing or tempering. After heating, the steel plates are cooled on cooling beds (including the first cooling bed W5, the second cooling bed W6, the third cooling bed W7, and the fourth cooling bed C8, etc.) and then enter the finished product line C. They are then straightened sequentially by the first straightening machine C7, inspected at the surface inspection station C6, straightened again by the second straightening machine C5, and cut to length by the sizing shearing machine C4 to meet the user's specifications. After being cut to length, the steel plates are transversely moved to the heat treatment bundling line D at the second stacker D2, bundled at the second bundling machine D1, and then the finished steel plate stack is lifted to the finished product area by a workshop crane.

[0054] The route of the non-oxidizing furnace heat treatment line W is as follows: Steel plate stacks are transported to the furnace loading platform W8 of the non-oxidizing furnace heat treatment line W via the roller conveyor of the finished product line C and the second transverse trolley W9. The first unstacking machine W1 breaks the steel plate stack into individual steel plates. Each individual steel plate undergoes surface shot blasting treatment in the first shot blasting machine W2, and then enters the non-oxidizing heating furnace W3 for normalizing or tempering. After heating, the steel plates are cooled by the second cooling bed W6 and the third cooling bed W7 before entering the finished product line C. They are then straightened by the first straightening machine C7, inspected at the surface inspection station C6, straightened again by the second straightening machine C5, and cut to length by the sizing shearing machine C4 to meet the user's specifications. The sizing-up steel plates are then transversely moved to the heat treatment bundling line D at the second stacker D2, bundled at the second bundling machine D1, and finally hoisted to the finished product area by a workshop crane.

[0055] The difference between normalizing and tempering lies in the heating temperature and cooling method: normalizing involves heating the steel plate to a certain temperature and then cooling it in air, while tempering involves heating the quenched steel plate to a certain temperature and then cooling it in an appropriate manner. Both can be completed in an open flame furnace or an oxidation-free furnace, and both require cooling on a cooling bed after heating.

[0056] Mode 4: Heat treatment (quenching and tempering) delivery This mode is suitable for products that require heat treatment (quenching + tempering) to obtain high strength and good comprehensive mechanical properties. The heat treatment requires two furnace heating cycles (quenching heating and tempering heating), which is the production mode that best embodies the flexible logistics structure of this invention.

[0057] The specific process is as follows: Steel coils are processed by the coil leveling line K to form steel plate stacks (the process is the same as in Mode 1). The steel plate stacks are transported to the finished product line C by the first transverse trolley K9. The steel plate stacks are then transported to the furnace loading platform W8 of the non-oxidizing furnace heat treatment line W via the roller conveyor of finished product line C and the second transverse trolley W9. The first unloading machine W1 breaks the steel plate stacks into individual steel plates. The individual steel plates enter the first shot blasting machine W2 for surface shot blasting treatment, and then enter the non-oxidizing heating furnace W3 for quenching heating. After heating, they are rapidly cooled by the quenching machine W4 (quenching). The quenched steel plates are then cooled by the second cooling bed W6 and the third cooling bed W7 before entering the finished product line C.

[0058] After quenching, the steel plate passes through the first straightening machine C7, the surface inspection station C6, the second straightening machine C5, and the length cutter C4 on the finished product line C for straightening, surface inspection, and length setting (this step is preliminary length setting, in preparation for subsequent tempering). Then, it is moved laterally to the heat treatment return line R at the transverse roller conveyor C3, and sent back to the non-oxidizing furnace heat treatment line W via the roller conveyor trolley R3 and the steel plate transverse moving device R1.

[0059] After returning to the non-oxidizing furnace heat treatment line W, the steel plates can be selectively shot-blasted again by the first shot blasting machine W2 (to remove surface oxide scale that may be generated during quenching), or directly tempered in the non-oxidizing heating furnace W3. After tempering, the steel plates are cooled by the second cooling bed W6 and the third cooling bed W7 before re-entering the finished product line C. They then pass through the first straightening machine C7 for straightening, the surface inspection station C6 for inspection, the second straightening machine C5 for straightening, and the length-cutting shear C4 for length measurement, achieving the final specifications required by the user. The length-cut steel plates are then moved laterally to the heat treatment bundling line D at the second stacker D2, bundled at the second bundling machine D1, and then the finished steel plates are stacked and lifted to the finished product area by a workshop crane.

[0060] In the quenching and tempering process, the steel plate passes through the non-oxidizing furnace heat treatment line W twice (first for quenching heating, then for tempering heating), and between the two furnace entries, it forms a complete circular logistics route via the finished product line C, the transverse roller conveyor C3, the heat treatment return line R, and the steel plate transverse transfer device R1. This is a typical example of how the invention achieves flexible logistics through the lateral connection between various functional lines. Without the heat treatment return line R and the related transverse transfer equipment, the quenching and tempering process would require transporting the steel plate out of the production line and back into it, significantly reducing production efficiency.

[0061] In addition to using steel coils as raw materials, the system of this invention can also receive stacks of steel plates from external sources for processing. A stack of steel plates refers to a stack of steel plates that has undergone preliminary processing (such as shearing and stacking) but still requires further heat treatment or shot blasting or other deep processing.

[0062] The specific process is as follows: The workshop overhead crane lifts the externally sourced steel plate stacks onto the stack loading roller conveyor C1 of the finished product line C. According to product delivery requirements, the steel plate stacks are transferred via the finished product line C roller conveyor and the second transverse trolley W9 to the furnace loading platform W8 of the non-oxidizing furnace heat treatment line W, or via the finished product line C roller conveyor and the third transverse trolley M5 to the furnace loading platform M4 of the open flame furnace heat treatment line M. Subsequent shot blasting, heat treatment, straightening, length setting, stacking, and bundling processes are the same as those described when using steel coils as raw materials. The shot blasting path, normalizing / tempering path, or quenching and tempering path can be selected according to product delivery requirements.

[0063] The production mode using steel plate stacks as raw materials further broadens the applicability of the system of the present invention, enabling the production line to not only process the steel plate stacks obtained by leveling within the system, but also to receive steel plate stacks from external sources for further processing, thereby improving the flexibility and economic efficiency of the production line.

[0064] Based on the above-mentioned various production modes, the flexible logistics working principle of the steel coil flexible handling system of the present invention can be summarized as follows: This invention breaks the isolation between functional sections of a traditional production line by arranging six functional lines in parallel and setting up various lateral transfer devices (including lateral trolleys, steel plate lateral transfer devices, lateral roller conveyors, stacker cranes, and cooling beds) between each functional line, thus forming multiple circular processing logistics lines between the functional lines.

[0065] Depending on the product delivery requirements, the system automatically allocates the flow route of the steel plates: For ordinary rolled plates, the steel plates only need to pass through the coil rolling line K and the finished product line C to complete the delivery; for products that require shot blasting, the steel plates enter the shot blasting section of the heat treatment line via a transverse trolley, and then return to the finished product line via the steel plate transverse transfer device and the heat treatment return line to complete the delivery; for products that require normalizing or tempering, the steel plates pass through the shot blasting and heating furnace, and then enter the finished product line via the cooling bed to complete straightening and length setting before delivery; for products that require quenching and tempering, the steel plates pass through the heating furnace twice via a circular logistics line to complete quenching and tempering treatment, and finally complete length setting and packaging delivery on the finished product line.

[0066] Various product delivery modes share the same basic functional lines such as the coil leveling line, finished product line, and heat treatment bundling line. Different processing is achieved through different lateral transfer paths, which fully utilizes the key equipment on each functional line, realizes the flexibility and efficiency of production line operations, meets the diversified delivery needs of high value-added steel plate products, and realizes the requirements of fully automatic allocation and unmanned production of steel plate processing routes within the system.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A flexible steel coil processing system, characterized in that, include: A coil leveling line (K) is used to uncoil, straighten, cut, and stack steel coils to form steel plate stacks. The oxidation-free furnace heat treatment line (W) is used for shot blasting, oxidation-free heating, quenching and cooling of single steel plates; The open flame furnace heat treatment line (M) is used for shot blasting, open flame heating and cooling of single steel plates; The heat treatment return line (R) is used to realize the lateral transfer and return of steel plates between the above-mentioned heat treatment lines; Finished product line (C) is used for straightening, surface inspection, length cutting, stacking and / or bundling of steel plates; The heat treatment bundling line (D) is used to stack and bundle heat-treated steel plates; The functional lines are connected by traversing trolleys, steel plate traversing devices, traversing roller conveyors, stackers and / or cooling beds, forming multiple circular processing logistics lines between the functional lines, enabling steel plates to flow between the functional lines as needed according to product delivery requirements; the system can process steel coils and / or steel plate stacks as raw materials.

2. The flexible steel coil processing system according to claim 1, characterized in that: The center lines of the non-oxidizing furnace heat treatment line (W), the open flame furnace heat treatment line (M), the heat treatment return line (R), the finished product line (C), the heat treatment bundling line (D), and the coil leveling line (K) are arranged in parallel.

3. The flexible steel coil processing system according to any one of claims 1 to 2, characterized in that: The end of the coil leveling line (K) is connected to the finished product line (C) via the first transverse trolley (K9) for transferring the leveled steel plate stack to the finished product line; The finished product line (C) is connected to the furnace feed platform of the non-oxidizing furnace heat treatment line (W) via the second transverse trolley (W9); The finished product line (C) is connected to the furnace loading platform of the open flame furnace heat treatment line (M) via the third transverse trolley (M5); The steel plate stacks are transferred between the leveling line, the finished product line and the heat treatment lines by the above-mentioned transverse trolleys, so as to provide the heat treatment lines with steel plate stacks to be processed. The roller conveyor behind the shot blasting machine of the non-oxidizing furnace heat treatment line (W) and the roller conveyor behind the shot blasting machine of the open flame furnace heat treatment line (M) are both connected to the roller conveyor of the heat treatment return line (R) through the steel plate transverse transfer device (R1), forming a transverse passage between the non-oxidizing furnace heat treatment line, the open flame furnace heat treatment line and the heat treatment return line, so as to realize the transverse flow of the steel plate after shot blasting between the three lines.

4. The flexible steel coil processing system according to claim 3, characterized in that: The heat treatment return line (R) and the finished product line (C) are connected by a first stacker (R2) and a transverse roller conveyor (C3); The first stacker (R2) is used to move single steel plates from the heat treatment return line to the finished product line for stacking; The transverse roller conveyor (C3) is used to transversely move single steel plates or stacks of steel plates between the finished product line and the heat treatment return line; The finished product line (C) and the heat treatment bundling line (D) are connected by a second stacker (D2). After heat treatment, the steel plates that have been straightened and cut to length by the finished product line are moved laterally by the second stacker (D2) to the heat treatment bundling line (D) to complete the stacking and bundling.

5. The flexible steel coil processing system according to claim 4, characterized in that: The non-oxidizing furnace heat treatment line (W) includes a first depalletizer (W1), a first shot blasting machine (W2), a non-oxidizing heating furnace (W3), a quenching machine (W4), and a cooling bed arranged sequentially along the material flow direction; The open flame heat treatment line (M) includes a second unloading machine (M1), a second shot blasting machine (M2), an open flame heating furnace (M3), and a cooling bed arranged sequentially along the material flow direction; The finished product line (C) includes a stacking and loading roller conveyor (C1) and a cooling bed, a first straightener (C7), a surface inspection station (C6), a second straightener (C5), a length cutter (C4), and a first baler (C2) arranged sequentially along the material flow direction; and the second stacker (D2) is arranged between the length cutter (C4) and the first baler (C2).

6. The flexible steel coil processing system according to claim 5, characterized in that: The first stacker (R2) set on the heat treatment return line (R) and the second stacker (D2) set on the finished product line (C) are interconnected via the heat treatment return line and the transverse roller conveyor (C3) to form a functional backup relationship. When one stacker fails, the other stacker can take over to complete the stacking operation.

7. A production method based on the flexible steel coil processing system of claim 6, characterized in that, Includes the following steps: S1: The steel coil is fed into the steel coil leveling line (K), where it is uncoiled, straightened, cut and stacked in sequence to form a steel plate stack; S21: According to the product delivery requirements, the steel plate stack is transferred from the coil leveling line (K) to the finished product line (C) by the first transverse trolley (K9), and then transferred to the furnace loading platform of the non-oxidizing furnace heat treatment line (W) or the open flame furnace heat treatment line (M) by the second transverse trolley (W9). S22: Ordinary flat plate delivery mode: The steel coil is processed by the coil flat plate line (K) to form a steel plate stack. The steel plate stack is transported to the finished product line (C) by the first transverse trolley (K9) and directly bundled at the first bundling machine (C2) in the finished product line to form the finished product. S3: The unloading machine on the non-oxidizing furnace heat treatment line (W) or open flame furnace heat treatment line (M) splits the steel plate stack into individual steel plates, and the individual steel plates enter the corresponding shot blasting machine for surface shot blasting treatment. S4: Select one of the following processing paths based on product delivery requirements: Shot blasting path: After shot blasting, the steel plate is sent to the heat treatment return line (R) via the steel plate transverse transfer device (R1), and then returned to the finished product line (C) via the first stacker (R2) for stacking, and is bundled by the first bundling machine (C2); Normalizing / Tempering Path: After shot blasting, the steel plate enters the heating furnace for normalizing or tempering heating, and after cooling on the cooling bed, it enters the finished product line (C), where it undergoes straightening, surface inspection, and length cutting in sequence. After being stacked at the second stacker (D2), it is sent to the heat treatment bundling line (D) and bundled by the second bundling machine (D1) in the heat treatment bundling line (D). Tempering Path: After shot blasting, the steel plate enters the non-oxidizing heating furnace (W3) for heating and is then quenched by the quenching machine (W4). After cooling on the cooling bed, it enters the finished product line (C), and is transferred to the heat treatment return line (R) via the transverse roller conveyor (C3). It then returns to the non-oxidizing heating furnace (W3) via the steel plate transverse transfer device (R1) for tempering. After tempering, it is cooled on the cooling bed and enters the finished product line (C) to complete straightening, surface inspection, and length cutting. After stacking at the second stacker (D2), it is sent to the heat treatment bundling line (D) and bundled by the second bundling machine (D1) in the heat treatment bundling line (D).

8. The production method according to claim 7, characterized in that: In the normalizing / tempering path, normalizing heating is carried out in an open flame furnace or an oxidation-free furnace, and tempering heating is carried out in an open flame furnace or an oxidation-free furnace. After cooling, the steel plates enter the finished product line (C) and are straightened by a straightening machine, inspected by a surface inspection station, and cut to length. After reaching the specifications required by the user, they are stacked and bundled.

9. The production method according to claim 7, characterized in that: In the quenching and tempering path, the quenched steel plate is directly straightened, surface inspected and cut to length on the finished product line (C), and then transferred to the heat treatment return line (R) by the transverse roller conveyor. It is then sent back to the non-oxidizing furnace heat treatment line (W) by the roller conveyor trolley and the steel plate transverse transfer device. Depending on the process requirements, it is selectively shot blasted again by the shot blasting machine or directly enters the non-oxidizing heating furnace for tempering.

10. A production method based on the flexible steel coil processing system of claim 6, characterized in that, Includes the following steps: S1: Externally sourced steel plate stacks are transported to the stack loading roller conveyor (C1) of the finished product line (C) by a workshop overhead crane; S2: According to the product delivery requirements, the steel plate stack is transferred to the furnace loading platform of the non-oxidizing furnace heat treatment line (W) or the open flame furnace heat treatment line (M) by the second transverse trolley (W9); S3: The unloading machine on the non-oxidizing furnace heat treatment line (W) or open flame furnace heat treatment line (M) splits the steel plate stack into individual steel plates, and the individual steel plates enter the corresponding shot blasting machine for surface shot blasting treatment. S4: Select one of the following processing paths based on product delivery requirements: Shot blasting path: After shot blasting, the steel plate is sent to the heat treatment return line (R) via the steel plate transverse transfer device (R1), and then returned to the finished product line (C) via the first stacker (R2) for stacking, and is bundled by the first bundling machine (C2); Normalizing / Tempering Path: After shot blasting, the steel plate enters the heating furnace for normalizing or tempering heating, and after cooling on the cooling bed, it enters the finished product line (C), where it undergoes straightening, surface inspection, and length cutting in sequence. After being stacked at the second stacker (D2), it is sent to the heat treatment bundling line (D) and bundled by the second bundling machine (D1) in the heat treatment bundling line (D). Tempering Path: After shot blasting, the steel plate enters the non-oxidizing heating furnace (W3) for heating and is then quenched by the quenching machine (W4). After cooling on the cooling bed, it enters the finished product line (C), and is transferred to the heat treatment return line (R) via the transverse roller conveyor (C3). It then returns to the non-oxidizing heating furnace (W3) via the steel plate transverse transfer device (R1) for tempering. After tempering, it is cooled on the cooling bed and enters the finished product line (C) to complete straightening, surface inspection, and length cutting. After stacking at the second stacker (D2), it is sent to the heat treatment bundling line (D) and bundled by the second bundling machine (D1) in the heat treatment bundling line (D).

Images