Continuous casting directly-rolled rod and wire billet hot delivery process line and continuous casting directly-rolled rod and wire billet hot delivery method

Abstract

The invention relates to the technical field of rod and wire production processes, in particular to a continuous casting direct rolling rod and wire billet hot delivery process line and method. According to the process line, a post-cutting heat preservation roller way, a temperature sorting unit with a lifting baffle and a steel shifting machine, a main conveying roller way, a flow dividing unit with a temperature compensation device and a pre-rolling checking unit are sequentially arranged between a continuous casting machine and a rod and wire roughing mill. According to the real-time temperature, the materials are intelligently sorted into direct hot delivery, on-line temperature compensation or elimination cooling; the whole process is coordinated by an automatic control system, qualified blanks with the most urgent temperature are conveyed preferentially according to rolling mill requirements and blank temperature data, and the problems of large temperature drop and uneven temperature in the hot delivery process of the continuous casting blanks are solved to a certain extent; accurate temperature control and efficient conveying of blanks are achieved, and the direct rolling rate, the production continuity and the energy utilization rate are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of bar and wire rod production technology, and more specifically, to a hot delivery process line and method for continuous casting and direct rolling of bar and wire rod billets. Background Technology

[0002] Continuous casting direct rolling is the most energy-efficient continuous casting hot charging process. It requires directly feeding high-temperature continuous casting billets (above 1100℃) into the rolling mill, eliminating the need for reheating in a heating furnace. However, achieving stable and efficient continuous casting direct rolling faces several challenges: First, the continuous casting workshop and the rolling mill are usually some distance apart, resulting in significant temperature drops in the billets during transport, especially large temperature differences between the head and tail billets. Second, there is a capacity and rhythm matching problem between the multi-stream production of the continuous casting machine and the single-line demand of the rolling line. Finally, the existing production line layout often lacks systematic optimization of the hot charging process, leading to severe heat loss from high-temperature billets and the inability to compensate for low-temperature billets in a timely manner, ultimately affecting the direct rolling rate and increasing energy consumption.

[0003] Existing hot charging processes mostly employ simple roller conveyors combined with a heating furnace buffer, lacking sophisticated online monitoring and dynamic path adjustment capabilities for billet temperature. When the billet temperature is insufficient, it is typically fed into the heating furnace as a whole, failing to differentiate between low-temperature billets that can be reheated and cold billets that must be heated. This results in uneconomical energy utilization. Furthermore, the conveying process lacks intelligent scheduling, making it difficult to prioritize the delivery of qualified billets with the most pressing temperature requirements based on the rolling mill's real-time needs, thus affecting production continuity and the effectiveness of hot charging and hot charging.

[0004] Therefore, there is an urgent need for a hot delivery process line and method that can monitor the temperature of continuously cast billets in real time, intelligently sort them, dynamically replenish heat, and efficiently coordinate with the rolling rhythm. Summary of the Invention

[0005] In view of this, in order to solve the above-mentioned problems in the prior art, this application provides a hot delivery process line and method for continuous casting and direct rolling of bar and wire rod billets.

[0006] The embodiments of this application are implemented as follows: In a first aspect, this application provides a hot delivery process for continuously cast and directly rolled bar and wire rod billets, comprising: The continuous casting billet conveying and initial sorting process involves transporting the high-temperature billets produced by the continuous casting machine and cut to length by hydraulic shears through a post-cutting heat-insulating roller conveyor to a lifting baffle equipped with a first temperature measuring device. Based on the measurement results of the first temperature measuring device, the billets are sorted into three categories: a first-category qualified billet whose temperature meets a first preset threshold, a second-category billet requiring additional heating whose temperature is lower than the first preset threshold but higher than the second preset threshold, and a third-category rejectable billet whose temperature is lower than the second preset threshold. The qualified billet is directly conveyed, and the lifting baffle is controlled to descend so that the first type of qualified billet can pass through and be accelerated into the conical converging transport roller table via the through roller cooling bed; For billets requiring reheating, the second type of billet requiring reheating is guided to the pre-reheating hot conveyor roller table, where it is heated by the reheating device. Then, the temperature is measured by the second temperature measuring device at the outlet of the reheating device. If the temperature after reheating meets the third preset threshold, it is guided to the post-reheating hot conveyor roller table by the steel separator; otherwise, it is guided to the heating furnace path. The confluence and final verification process involves transporting qualified billets from the conical confluence transport roller table and qualified billets from the reheated hot delivery roller table together to the hot delivery roller table in front of the bar and wire roughing mill, where a third temperature measuring device installed on it performs the final temperature measurement. If the final temperature of the billet on the hot conveyor before the bar and wire roughing mill meets the rolling threshold, it is sent to the bar and wire roughing mill for rolling; otherwise, it is removed from the conveyor line by the scrap steel removal device.

[0007] In one possible implementation, during the continuous casting billet conveying and initial sorting step, when multiple first-type qualified billets are waiting to be conveyed simultaneously, the control logic prioritizes the billet with the lowest measured temperature to pass through the lifting baffle first.

[0008] In one possible implementation, during the continuous casting billet conveying and initial sorting step, for billets identified as the third type of rejectable billets, the steel drawing machine is controlled to remove them from the post-cutting heat-preserving roller conveyor and transfer them to the cooling station of the through-roll cooling bed.

[0009] In one possible implementation, during the continuous casting billet conveying and initial sorting step, if a third type of rejectable billet appears in the billets produced by the same continuous casting machine, then the next N consecutive billets in that flow are also identified as the third type of rejectable billets and removed, where N≥1.

[0010] In one possible implementation, in the process of treating the billet requiring additional heating, the heating device is an induction furnace or a tunnel heating furnace that uses blast furnace gas or coke oven gas as fuel.

[0011] Secondly, this application provides a hot delivery process line for continuous casting and direct rolling bar and wire rod billets, including an initial conveying unit, a temperature sorting unit, a main conveying roller table, a temperature compensation and diversion unit, a heating furnace connection unit, and a pre-rolling verification unit arranged sequentially along the process flow direction.

[0012] The initial conveying unit includes a hydraulic shear for cutting the continuous casting billet to length and a post-cutting heat preservation roller conveyor for receiving and conveying the cut billet. The temperature sorting unit is connected downstream of the initial conveying unit and includes a lifting baffle spanning the end of the post-cutting heat preservation roller conveyor, a steel-drawing machine located beside the lifting baffle for laterally moving the billet out, and a through-roll cooling bed located on the side of the steel-drawing machine in the direction of movement; a first temperature measuring device is installed at the lifting baffle. The main conveyor roller conveyor is connected downstream of the temperature sorting unit and is used to quickly convey the billets that are allowed to pass through. The heat replenishment and diversion unit is connected to the downstream branch point of the main conveyor roller table. It includes a steel divider, a preheating hot conveyor roller table led out from the first outlet of the steel divider, a heat replenishment device set on the preheating hot conveyor roller table, and a second temperature measuring device set at the outlet of the heat replenishment device. The heating furnace connection unit is connected to the heat replenishment and diversion unit, and includes a steel transfer machine front roller conveyor led out from the second outlet of the steel distributor, a steel transfer machine set at the end of the steel transfer machine front roller conveyor, and a heating furnace loading roller conveyor connecting the steel transfer machine and the heating furnace. The pre-rolling verification unit is connected downstream of the main conveyor roller table and the qualified outlet of the heating device. It includes a heating post-heating hot conveyor roller table, a hot conveyor roller table before the bar and wire roughing mill, a third temperature measuring device installed on the hot conveyor roller table before the bar and wire roughing mill, and a scrap steel rejection device corresponding to the third temperature measuring device.

[0013] In one possible implementation, the main conveyor roller conveyor is a conical converging conveyor roller conveyor with a single drive structure, and its length and slope are customized according to the terrain features.

[0014] In one possible implementation, the linear velocity of the roller surface of the through-roll cooling bed is higher than that of the roller surface of the post-cutting heat preservation roller table, in order to accelerate the passing billet.

[0015] One possible implementation also includes a control system; The control system is connected to the drive mechanisms of the first temperature measuring device, the second temperature measuring device, the third temperature measuring device, the lifting baffle, the steel pusher, the steel separator, the steel transfer machine, and all roller conveyors.

[0016] In one possible implementation, the first temperature measuring device, the second temperature measuring device, and the third temperature measuring device are all infrared thermometers.

[0017] The technical solution provided in this application can achieve at least the following beneficial effects: This application provides a hot conveying process line and method for continuously cast and directly rolled bar and wire rod billets. By constructing a closed-loop process line integrating temperature monitoring, intelligent sorting, path decision-making, and dynamic heat replenishment functions, it achieves precise and efficient temperature management of continuously cast billets during the conveying process. This solves the problems of low direct rolling ratio, high energy consumption, and mismatched production rhythm caused by the separation, long distance, and large temperature drop between the continuous casting and rolling processes in the original production line. This invention changes the traditional hot conveying approach of "isolated processes and passive conveying" and establishes a unified control standard and intelligent execution process with "temperature" as the core, realizing integration of process control and material connection from the continuous casting billet exit to the rolling mill inlet.

[0018] The process line and method of this invention are designed based on the stringent requirements for billet temperature in continuous casting and direct rolling processes. The constructed multi-level temperature measurement-sorting-temperature compensation-verification closed-loop control logic can respond in real time to billet temperature fluctuations and changes in rolling requirements, providing a reliable technical means for the stable implementation of high-temperature direct rolling. The method and system have high flexibility and scalability. Its core parameters such as sorting threshold, temperature compensation strategy, and conveying priority can be quickly adjusted and optimized according to specific conditions such as steel grade, cross-sectional specifications, and production line layout. This helps to solve the problems of uncontrollable temperature, low pass rate, and large energy waste in the original hot conveying process, significantly improving hot conveying efficiency, production continuity, and energy utilization economy. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic flow diagram illustrating an exemplary embodiment of the hot delivery process for continuously cast and rolled bar and wire rod billets in this application. Figure 2 This is a schematic flowchart illustrating a specific implementation process of a hot delivery method for continuously cast and directly rolled bar and wire rod billets, as shown in an exemplary embodiment of this application. Figure 3 This is a schematic diagram of a hot delivery process line for continuous casting and direct rolling bar and wire rod billets, as shown in an exemplary embodiment of this application.

[0021] Figure label: 1. Hydraulic shears; 2. Post-cutting heat preservation roller conveyor; 3. Lifting baffle; 4. Steel transfer machine; 5. Through-roll cooling bed; 6. Conical converging conveyor roller conveyor; 7. Steel separator; 8. Hot conveyor roller conveyor before heat replenishment; 9. Heat replenishment device; 10. Roller conveyor before steel transfer machine; 11. Steel transfer machine; 12. Loading roller conveyor for heating furnace; 13. Heating furnace; 14. Hot conveyor roller conveyor after heat replenishment; 15. Hot conveyor roller conveyor before bar and wire rod roughing mill; 16. Scrap steel removal device. Detailed Implementation

[0022] To make the objectives, implementation methods and advantages of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0023] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0024] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0025] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0026] Next, the technical solutions of this application and how they solve the aforementioned technical problems will be described in detail through embodiments and in conjunction with the accompanying drawings. The embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application.

[0027] In one exemplary embodiment, such as Figure 1 and Figure 2 As shown, a hot delivery process for continuously cast and directly rolled bar and wire rod billets is provided. In this embodiment, the method may include the following steps: Step 100, Continuous casting billet conveying and initial sorting: After the molten steel is cast and solidified by the continuous caster, a high-temperature continuous casting billet is formed. The high-temperature continuous casting billet is first cut to a fixed length by the hydraulic shear 1 to meet the rolling length requirements. After cutting, the high-temperature continuous casting billet immediately enters the post-cutting holding roller table 2, which can be equipped with a heat-insulating cover to slow down the radiative temperature drop of the billet in the initial stage of transportation. The high-temperature continuous casting billet after cutting is transported to the end of the roller table, that is, the entrance of the temperature sorting unit, where there is a lifting baffle 3 and a first temperature measuring device (such as an infrared thermometer) integrated there. When the billet arrives, the first temperature measuring device quickly measures its surface temperature T1.

[0028] Automatically sort according to the T1 value: If T1≥A °C (A is the first preset threshold, for example, set to 1050 °C, this temperature is higher than the Ar3 phase transformation point of most steel grades, ensuring that the billet is in a fully austenitic state and has good plasticity), then the billet is judged as the first type of qualified billet and can be directly hot-delivered.

[0029] If B °C < T1 < A °C (B is the second preset threshold, for example, set to 850 °C, this temperature is the lower limit that can be economically and effectively restored to the rolling temperature through subsequent rapid temperature compensation), then the billet is judged as the second type of billet that needs temperature compensation.

[0030] If T1≤B °C, or the production plan clearly does not require hot delivery, then the billet is judged as the third type of rejected billet.

[0031] Step 200, directly transport the qualified billet: For the billets judged as the first type of qualified billets, when the casting stream they belong to receives the "steel demand" signal from the rolling operation room, control the lifting baffle 3 of this stream to descend. After the billet crosses the baffle, it enters the area of the through-roller cooling bed 5. The roller table of this cooling bed is set to the high-speed mode to "throw" a single billet out at an accelerated speed, so that it quickly enters the downstream main conveying roller table (in this embodiment, it is the conical converging conveying roller table 6), aiming to shorten the conveying time of the billet in the air and reduce the temperature drop.

[0032] Step 300, process the billets that need temperature compensation: For the billets judged as the second type of billets that need temperature compensation, control the billet splitter 7 to act, and guide them to the pre-temperature-compensation hot-delivery roller table 8. The billets that need temperature compensation enter the temperature compensation device 9 along this roller table. The temperature compensation device 9 can adopt two forms: one is an induction furnace, which quickly and evenly penetrates and heats the billet through the principle of electromagnetic induction; the other is a tunnel furnace fueled by blast furnace gas or coke oven gas, which radiatively heats the billet.

[0033] After the billet is reheated, the second temperature measuring device measures the temperature T2 at its outlet to determine whether T2 meets the third preset threshold (for example, set to 1020℃, slightly lower than A, but sufficient to ensure rolling). If T2 meets the standard, the steel separator 7 is operated again to guide the billet back to the main process and into the reheated hot conveying roller 14. If T2 still does not meet the standard, the steel separator 7 guides it to the branch path leading to the heating furnace 13.

[0034] Step 400, Convergence and Final Verification: The directly qualified billets from the conical confluence conveyor roller 6 and the reheated qualified billets from the reheated hot conveyor roller 14 converge here and continue to be conveyed to the hot conveyor roller 15 before the bar and wire roughing mill. At this node, a third temperature measuring device is installed to perform the final temperature measurement on each billet about to enter the roughing mill and obtain the temperature T3.

[0035] Step 500, entering the rolling mill or final rejection: Determine whether T3 meets the rolling threshold (e.g., set to ≥900℃, which is the minimum temperature requirement to ensure smooth rolling process and qualified product mechanical properties). If T3 meets the requirement, the billet is smoothly fed into the first bar and wire rod roughing mill for rolling. If T3 is lower than the rolling threshold, the scrap steel removal device 16 is activated to quickly remove the billet from the conveyor line to prevent low-temperature steel ingots from entering the rolling mill and causing equipment impact or generating scrap.

[0036] In some embodiments, during the initial sorting step, multiple first-class qualified billets are often produced simultaneously by multi-strand continuous casting machines and queued in front of the lifting baffle 3. To optimize hot delivery efficiency and prevent qualified billets from cooling down and failing due to excessive waiting time, a temperature priority selection rule can be set. Specifically, the T1 value of qualified billets at each waiting position is continuously monitored. When the rolling mill issues a "request steel" signal, it does not simply release them in a "first-come, first-served" order, but prioritizes the billet with the lowest measured temperature T1 among all currently waiting qualified billets and controls the lifting baffle 3 of its flow to descend for release. The core purpose of this logic is to "rescue" those qualified billets with the smallest temperature margin, maximize the utilization of the billet's own thermal energy, and thus systematically improve the direct rolling rate and thermal energy utilization rate of the entire hot delivery line.

[0037] In one embodiment, for a billet determined to be a third type of rejectable billet, the system will perform a rejection operation. While the lifting baffle 3 remains in the raised state, the control system will start the steel-pushing machine 4 located next to it. The steel-pushing machine 4 will move the billet laterally away from the post-cutting heat preservation roller conveyor 2 and let it fall into the fixed frame or specific cooling station of the adjacent through roller cooling bed 5 for natural cooling or forced cooling. Subsequently, it will be hoisted by an overhead crane to the cold billet storage yard.

[0038] Furthermore, considering that in the continuous casting production process, if a low-temperature billet (third-class rejectable billet) appears in a certain flow, it usually means that there may be a short-term fluctuation in the cooling of the crystallizer or the secondary cooling section of that flow, and the billets that follow it are also likely to have a low temperature. In order to improve the stability of the production rhythm and avoid frequent sorting, a continuous rejection strategy can also be implemented: that is, when a third-class rejectable billet appears in the billets produced in the same flow, the control system can automatically identify the next N billets (N is a preset value, usually N≥1, which can be set to 2 or 3 according to the process stability) as rejectable billets, and remove them together by the steel drawing machine 4. After the batch is rejected, the control system resumes the normal temperature measurement and sorting process for the subsequent billets of that flow.

[0039] In one embodiment, the specific form of the heating device 9 in the process of processing billets requiring additional heating can be selected according to the needs and site conditions: Implementation Method 1 (Induction Heating): An induction furnace is used as the heat compensation device 9. Its advantages are fast heating speed, high efficiency, precise temperature control and no combustion exhaust gas. The induction coil automatically adjusts the power according to the specifications of the billet and the temperature difference to be compensated, so as to achieve rapid and uniform heat compensation.

[0040] Implementation Method 2 (Gas Heating): A tunnel-type heating furnace is used as the heating device 9. The fuel is blast furnace gas, coke oven gas or a mixture thereof. Multiple burners are arranged inside the furnace to heat the billet through radiation and convection. This method can achieve efficient utilization of energy in stages and reduce the operating cost of the heating process.

[0041] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially as indicated, these steps are not necessarily executed in the indicated order. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps.

[0042] Corresponding to the aforementioned embodiments of the hot delivery process for continuous casting and direct rolling bar and wire rod billets, and employing the same technical concept, this application also provides embodiments of a hot delivery process line for continuous casting and direct rolling bar and wire rod billets.

[0043] In one exemplary embodiment, such as Figure 3 As shown, the continuous casting and direct rolling bar and wire rod hot delivery process line consists of the following equipment units connected in sequence: Initial conveying unit: Starting from the continuous casting machine outlet, it mainly includes hydraulic shear 1 and post-cutting heat preservation roller conveyor 2. Hydraulic shear 1 completes the fixed-length cutting, and post-cutting heat preservation roller conveyor 2 is responsible for receiving and conveying the hot billet forward. Its design focuses on heat preservation to reduce the initial temperature drop.

[0044] Temperature sorting unit: directly connected to the end of the post-cutting heat preservation roller conveyor 2. This unit includes: lifting baffle 3 (as a mechanical actuator for release / interception), first temperature measuring device (integrated near the lifting baffle 3), steel stripper 4 (installed on one side of the roller conveyor for transverse rejection of unqualified billets), and through roller cooling bed 5 (located on one side of the steel stripper 4 in the direction of action, used to receive rejected billets and has the function of accelerating the conveying of qualified billets).

[0045] Main conveyor rollers: connected downstream of the qualified billet outlet of the through-roll cooling bed 5. The main conveyor rollers are specifically a conical converging conveyor rollers 6, which are used to quickly and smoothly converge and transport qualified billets from the multi-strand continuous casting machine to the rolling area over a long distance.

[0046] The heat compensation and diversion unit is a process bifurcation point located downstream of the main conveyor roller. Its core is the steel divider 7, which guides the billet to different paths according to instructions. Its first outlet is connected to the preheating conveyor roller 8, which is equipped with a heat compensation device 9. The outlet of the heat compensation device 9 is equipped with a second temperature measuring device. The action of the steel divider 7 determines whether the billet enters the heat compensation process or is guided to the branch path leading to the heating furnace 13.

[0047] Heating furnace 13 connection unit: As a backup path for billets that fail to meet the reheating requirements or require conventional heating, it starts from the second outlet of the steel distributor 7, includes the front roller conveyor 10 of the steel transfer machine, the steel transfer machine 11 and the heating furnace loading roller conveyor 12, and finally connects to the conventional heating furnace 13.

[0048] Pre-rolling verification unit: This is the last functional section before the billet enters the rolling mill. It receives directly qualified billets from the main conveyor roller table and qualified billets after reheating from the hot conveyor roller table 14. The billets are then conveyed through the hot conveyor roller table 15 before the bar and wire roughing mill. This unit includes a third temperature measuring device and a scrap steel rejection device 16 connected to it, forming the final quality barrier.

[0049] In one embodiment, the continuous casting and direct rolling bar and wire rod billet hot delivery process line also includes a control system. The control system consists of an industrial computer, operation buttons, signal indicator lights, and a programmable logic controller located in the electrical room, all installed in the continuous casting billet exit control room and the rolling control room. The control system is connected to all the temperature measuring devices, actuators, and motor drive mechanisms of each section of the roller conveyor via an industrial network. It is responsible for receiving instructions such as "request steel", processing temperature signals at each point, coordinating the actions of all equipment on the line, and realizing intelligent and automated hot delivery control.

[0050] In one embodiment, the main conveyor roller conveyor is specifically a conical converging conveyor roller conveyor 6. Its design features a single drive structure, where one or a group of centralized drive motors drive all the rollers of the entire roller conveyor through a long shaft and coupling. The structure is simple and easy to maintain. In addition, the length, horizontal direction and slope of the roller conveyor are not standard designs, but need to be customized and laid out according to the actual terrain, plant layout and elevation difference between the steelmaking continuous casting workshop and the steel rolling workshop to ensure efficient conveying and overcome geographical obstacles to achieve a smooth transition.

[0051] In one embodiment, the through-roll cooling bed 5 serves a dual function in this invention: firstly, as a cooling platform for rejecting billets, and secondly, as an accelerator for qualified billets. To achieve the acceleration function, the drive motor of its roller conveyor is configured to provide a higher rotational speed, making the roller surface linear velocity of the through-roll cooling bed 5 significantly higher than that of the upstream post-cutting heat preservation roller conveyor 2. When a qualified billet enters the through-roll cooling bed 5 area from the slower post-cutting heat preservation roller conveyor 2, it will be instantly accelerated, thereby entering the subsequent conical converging transport roller conveyor 6 with a faster initial velocity, effectively shortening the exposure time of the billet during the transport process and facilitating heat preservation.

[0052] In one embodiment, to ensure rapid, accurate and non-contact temperature measurement, the first, second and third temperature measuring devices are preferably high-performance infrared thermometers. These thermometers are installed in protective sleeves with purging and cooling functions, and are respectively aimed at specific measurement points along the billet, transmitting the detected temperature signals to the control system in real time.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A hot delivery process for continuously cast and directly rolled bar and wire rod billets, characterized in that, include: The continuous casting billet conveying and initial sorting process involves transporting the high-temperature billets produced by the continuous casting machine and cut to length by hydraulic shears through a post-cutting heat-insulating roller conveyor to a lifting baffle equipped with a first temperature measuring device. Based on the measurement results of the first temperature measuring device, the billets are sorted into three categories: a first-category qualified billet whose temperature meets a first preset threshold, a second-category billet requiring additional heating whose temperature is lower than the first preset threshold but higher than the second preset threshold, and a third-category rejectable billet whose temperature is lower than the second preset threshold. The qualified billet is directly conveyed, and the lifting baffle is controlled to descend so that the first type of qualified billet can pass through and be accelerated into the conical converging transport roller table via the through roller cooling bed; For billets requiring reheating, the second type of billet requiring reheating is guided to the pre-reheating hot conveyor roller table, where it is heated by the reheating device. Then, the temperature is measured by the second temperature measuring device at the outlet of the reheating device. If the temperature after reheating meets the third preset threshold, it is guided to the post-reheating hot conveyor roller table by the steel separator; otherwise, it is guided to the heating furnace path. The confluence and final verification process involves transporting qualified billets from the conical confluence transport roller table and qualified billets from the reheated hot delivery roller table together to the hot delivery roller table in front of the bar and wire roughing mill, where a third temperature measuring device installed on it performs the final temperature measurement. If the final temperature of the billet on the hot conveyor before the bar and wire roughing mill meets the rolling threshold, it is sent to the bar and wire roughing mill for rolling; otherwise, it is removed from the conveyor line by the scrap steel removal device.

2. The hot delivery process for continuously cast and directly rolled bar and wire rod billets as described in claim 1, characterized in that, In the continuous casting billet conveying and initial sorting step, when multiple first-type qualified billets are waiting to be conveyed at the same time, the control logic prioritizes the billet with the lowest measured temperature to pass through the lifting baffle first.

3. The hot delivery process for continuously cast and directly rolled bar and wire rod billets as described in claim 1, characterized in that, In the continuous casting billet conveying and initial sorting step, for the billets identified as the third type of rejectable billets, the steel drawing machine is controlled to remove them from the post-cutting heat preservation roller conveyor and transfer them to the cooling station of the through roller cooling bed.

4. The hot delivery process for continuously cast and directly rolled bar and wire rod billets as described in claim 3, characterized in that, In the continuous casting billet conveying and initial sorting step, if a third type of rejectable billet appears in the billet produced by the same continuous casting machine, then the next N consecutive billets in that flow are also identified as the third type of rejectable billets and removed, where N≥1.

5. The hot delivery process for continuously cast and directly rolled bar and wire rod billets as described in claim 1, characterized in that, In the process of treating billets requiring additional heating, the heating device is an induction furnace or a tunnel heating furnace that uses blast furnace gas or coke oven gas as fuel.

6. A hot-feeding process line for continuously cast and directly rolled bar and wire rod billets, capable of realizing the hot-feeding process method for continuously cast and directly rolled bar and wire rod billets as described in any one of claims 1 to 5, characterized in that, The initial conveying unit, temperature sorting unit, main conveying roller conveyor, supplementary temperature diversion unit, heating furnace connection unit, and pre-rolling verification unit are arranged sequentially along the process flow direction. The initial conveying unit includes a hydraulic shear for cutting the continuous casting billet to length and a post-cutting heat preservation roller conveyor for receiving and conveying the cut billet. The temperature sorting unit is connected downstream of the initial conveying unit and includes a lifting baffle spanning the end of the post-cutting heat preservation roller conveyor, a steel-drawing machine located beside the lifting baffle for laterally moving the billet out, and a through-roll cooling bed located on the side of the steel-drawing machine in the direction of movement; a first temperature measuring device is installed at the lifting baffle. The main conveyor roller conveyor is connected downstream of the temperature sorting unit and is used to quickly convey the billets that are allowed to pass through. The heat replenishment and diversion unit is connected to the downstream branch point of the main conveyor roller table. It includes a steel divider, a preheating hot conveyor roller table led out from the first outlet of the steel divider, a heat replenishment device set on the preheating hot conveyor roller table, and a second temperature measuring device set at the outlet of the heat replenishment device. The heating furnace connection unit is connected to the heat replenishment and diversion unit, and includes a steel transfer machine front roller conveyor led out from the second outlet of the steel distributor, a steel transfer machine set at the end of the steel transfer machine front roller conveyor, and a heating furnace loading roller conveyor connecting the steel transfer machine and the heating furnace. The pre-rolling verification unit is connected downstream of the main conveyor roller table and the qualified outlet of the heating device. It includes a heating post-heating hot conveyor roller table, a hot conveyor roller table before the bar and wire roughing mill, a third temperature measuring device installed on the hot conveyor roller table before the bar and wire roughing mill, and a scrap steel rejection device corresponding to the third temperature measuring device.

7. The continuous casting and direct rolling bar and wire rod billet hot delivery process line as described in claim 6, characterized in that, The main conveyor roller conveyor is a conical converging conveyor roller conveyor with a single drive structure, and its length and slope are customized according to the terrain features.

8. The continuous casting and direct rolling bar and wire rod billet hot delivery process line as described in claim 6, characterized in that, The linear velocity of the roller surface of the through-roll cooling bed is higher than that of the roller surface of the post-cutting heat preservation roller table, which is used to accelerate the passing billet.

9. The continuous casting and direct rolling bar and wire rod billet hot delivery process line as described in claim 6, characterized in that, It also includes the control system; The control system is connected to the drive mechanisms of the first temperature measuring device, the second temperature measuring device, the third temperature measuring device, the lifting baffle, the steel pusher, the steel separator, the steel transfer machine, and all roller conveyors.

10. The continuous casting and direct rolling bar and wire rod billet hot delivery process line as described in claim 6, characterized in that, The first, second, and third temperature measuring devices are all infrared thermometers.

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