Method for automatically recovering dummy ingot chain in continuous casting

Abstract

The invention provides a method for automatically recovering a dummy ingot chain in continuous casting, which relates to the technical field of automatic control of continuous casting machines and realizes accurate positioning and automatic control of the dummy ingot chain in a fan-shaped section of a continuous casting machine by integrating detection devices such as a winch encoder, a withdrawal and straightening encoder, a photoelectric sensor and a limit switch through a PLC (Programmable Logic Controller) system. The method specifically comprises the following steps: inserting a dummy ingot chain before casting and checking the state; the position of a dummy bar chain is monitored in real time through an encoder, and winch subsection speed control is triggered according to threshold values of a seventh fan-shaped section and a thirteenth fan-shaped section; a photoelectric tube is used for switching the lifting height and positioning a winch insertion position; and a front hook of a dummy bar vehicle chain hooks the hanging rod to finish traction recovery. A multi-sensor cooperative control, sectional speed regulation and redundancy detection mechanism is adopted, the problems that traditional manual recovery is low in efficiency, large in positioning error and high in manual operation risk are solved, the recovery time is remarkably shortened, the operation rate of a continuous casting machine is improved, and the service life of a dummy ingot chain is prolonged.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology for continuous casting machines, and more particularly to a method for automatically recovering the dummy bar chain in continuous casting. Background Technology

[0002] Continuous casting production allows for the continuous pouring of multiple heats of molten steel, reducing equipment downtime and improving equipment utilization and production efficiency. However, it requires quick restarts after a shutdown, demanding that the dummy chain complete loading and unloading quickly and accurately to ensure efficient production. During dummy chain retrieval, its positional accuracy and motion stability directly affect the safe operation of the casting machine.

[0003] However, traditional dummy chain recovery methods, which rely on manual or semi-automatic processes, are inefficient and cannot meet the high-paced demands of current continuous casting production. Furthermore, manual operation is prone to errors, leading to inaccurate dummy chain placement and potential equipment malfunctions and slab scratches. It also requires a significant workforce, and improper operation during dummy chain recovery can cause substantial wear and tear, increasing equipment replacement and maintenance costs. Therefore, a technical solution that addresses these issues is urgently needed. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for automatically recovering the dummy ingot chain in continuous casting. This invention achieves fully automated and precise recovery of the dummy ingot chain from the crystallizer to the storage location through PLC control, encoder positioning, and segmented hoist speed adjustment.

[0005] To achieve the above objectives, the present invention provides a method for automatically recovering a continuous casting spool chain, comprising the following steps: S1. Insertion and status check of the ingot chain: Before pouring, insert the ingot chain under the crystallizer to ensure that the head of the ingot chain is firmly connected and not loose. S2. Signal Confirmation: The working status of the hoist encoder, straightening motor encoder, traction chain hook encoder, photoelectric sensor and limit switch is detected by the PLC system. S3, Mode Selection: Select the automatic recovery mode in the continuous casting machine control system. After the casting flow starts, the siphon chain moves under the drive of the straightening machine. S4. Position detection of the traction chain and control of the clamping roller: The position of the traction chain in the sector section is located by the encoder of the straightening motor. When the position of the traction chain is greater than the closing value A of the corresponding clamping roller, the clamping roller is automatically closed and tracking starts from clamping roller No. 5. S5. The hoisting control of the dummy bar winch in the No. 7 sector section: When the current position of the dummy bar chain is detected to enter the No. 7 sector section, the dummy bar winch starts to descend from the rising stop position until it reaches the pre-position position and then stops. S6. The hoisting device of the dummy bar is controlled in the No. 13 sector section: When the current position of the dummy bar chain is detected to enter the No. 13 sector section, the dummy bar hoisting device starts to descend slowly from the pre-positioned position until it reaches the descent stop position and then stops. S7. Pulling Chain Lifting Control: When the current position of the pulling chain is detected to have entered the recyclable zone, and the pulling chain activates the hoisting phototube in that zone, the hoisting drive device is started to drive the pulling chain to rise. S8. Winch Insertion Position Positioning: When the derrick winch device is raised to near the predetermined winch insertion position, the lifting speed of the winch drive device is automatically reduced, so that the derrick chain slowly approaches and finally stops at the winch insertion position. S9. Retrieval of the traction bar trolley: When the traction bar trolley detects that the traction chain has stopped at the winch insertion position, the traction bar trolley starts from the waiting position and moves to the winch insertion position, and pulls the traction chain forward and onto the trolley through the traction device. S10. Storage of the traction chain: When the traction chain reaches the storage position, the traction drive device stops working, and the traction chain is automatically retrieved and ready for the next use.

[0006] Further, the closing value A in S4 is set according to the clamping roller number: the closing value A of clamping roller No. 5 is 1583mm, the closing value A of clamping roller No. 6 is 3584mm, the closing value A of clamping roller No. 7 is 5654mm, the closing value A of clamping roller No. 8 is 7769mm, the closing value A of clamping roller No. 9 is 9869mm, the closing value A of clamping roller No. 10 is 11969mm, the closing value A of clamping roller No. 11 is 14069mm, the closing value A of clamping roller No. 12 is 16169mm, the closing value A of clamping roller No. 13 is 18269mm, the closing value A of clamping roller No. 14 is 20369mm, and the closing value A of clamping roller No. 15 is 22469mm.

[0007] Furthermore, in S5, the entry of the dummy bar chain into the 7th sector segment specifically means that the position of the dummy bar chain is greater than 17440mm; the descent speed of the dummy bar winch is set to 6m / min; the pre-position is set to 2000mm, and the feedback signal from the photoelectric tube switch installed at the pre-position and the winch motor encoder is used to detect in real time whether the dummy bar winch has reached the pre-position. Once the arrival signal is detected, the dummy bar winch is immediately controlled to stop descending.

[0008] Further, in S6, the entry of the dummy bar chain into the 13th sector segment specifically means that the position of the dummy bar chain is greater than 30055mm; the slow descent speed of the dummy bar winch is set to 3m / min; the descent stop position is set to 0mm, and the feedback signal from the photoelectric tube switch installed at the descent stop position and the winch motor encoder is used to detect whether the descent stop position has been reached. When the arrival signal is detected, the dummy bar winch is controlled to stop descent.

[0009] Furthermore, in step S7, the initial speed of the dummy bar lifting is consistent with the continuous casting speed; during the lifting process, the feedback signal of the winch motor encoder is continuously read and compared with the preset lifting height parameter; when the actual position of the dummy bar reaches the preset separation height from the billet of 13000mm, the lifting speed of the winch drive device is adjusted to 6m / min to ensure that the dummy bar smoothly separates from the billet; and step S7 also includes a spare winch lifting phototube, which is used to replace the dummy bar lifting operation when the winch lifting phototube fails, ensuring system reliability.

[0010] Furthermore, in step S8, the hoisting device of the derrick is determined to be close to the hoisting insertion position by the feedback signal from the limit switch installed near the hoisting insertion position and the hoisting motor encoder. When the approach signal from the limit switch and the hoisting motor encoder is received, the speed of the hoisting drive device is reduced according to the preset deceleration curve, and the feedback signal from the hoisting motor encoder is continuously monitored and accurately compared with the set value of the hoisting insertion position to ensure that the derrick chain stops accurately at the hoisting insertion position.

[0011] Furthermore, in S9, the traction device includes a traction device motor, a sprocket, and a chain. The chain is equipped with a front hook and a rear hook. When the traction bar chain is pulled forward onto the vehicle, the motor drives the sprocket to rotate, which in turn drives the chain to move. The front hook on the chain hooks the hanging rod of the traction bar chain, and the rear hook hooks the traction bar head, thereby achieving reliable traction of the traction bar chain. The traction bar trolley moves by traveling on the track through the wheels at its bottom. The start, stop, and positioning of the traction bar trolley are controlled by the feedback signal from the encoder on the traction bar trolley, ensuring that the traction bar trolley accurately reaches the winch insertion position.

[0012] Furthermore, the control processes from S2 to S9 are implemented through a PLC system. In S2, the PLC system collects signals from the encoder of the straightening motor, the photoelectric sensor on the roller conveyor, the encoder of the hoisting motor, the proximity switch, and the encoder on the derrick car, and verifies the validity of the signals. In S4, the PLC system calculates the actual position of the derrick chain based on the feedback signal from the encoder on the straightening motor, and outputs a control signal to the drive mechanism of the clamping roller according to the actual position, thereby achieving automatic control of the opening and closing of the clamping roller. Throughout the automatic recycling process, the PLC system also has overload protection and fault alarm functions. When an overload or abnormal signal is detected, a stop signal is immediately output to the corresponding drive device, and an alarm is issued.

[0013] Furthermore, in step S3, the working mode of automatic recovery of the dummy chain is selected through the HMI interface of the continuous casting machine operation control system. After the casting flow starts, when the straightening machine drives the dummy chain to move downward, the drive rollers distributed in the fan-shaped section coordinate with the detection and execution elements on the dummy bar car. The drive rollers control whether to press down the dummy chain according to the movement state of the dummy chain, and pull the dummy chain out of the fan-shaped section by rotating the drive rollers in the forward direction, thus providing conditions for the subsequent recovery steps.

[0014] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: 1. The present invention provides a method for automatic recovery of the dummy chain in continuous casting. The automatic recovery system is controlled by PLC program and triggered by segmented position, which replaces manual operation, greatly reduces the time spent on dummy chain recovery, and improves the overall operating efficiency of continuous casting machine.

[0015] 2. The present invention provides a method for automatic recovery of the dummy chain in continuous casting, which combines the positioning of the straightening motor encoder, the feedback of the hoist photoelectric switch and the preset deceleration positioning logic to achieve high-precision stopping of the dummy chain at the lifting, hoisting stop position and hoisting insertion position, avoiding manual calibration.

[0016] 3. The present invention provides a method for automatic recovery of the traction chain in continuous casting, in which the PLC system autonomously performs status detection, fault switching and traction actions, avoiding the risk of equipment damage and billet scratches caused by human error. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a flowchart of a method for automatically recycling a continuous casting spool chain according to the present invention; Figure 2 This is a schematic diagram of the continuous casting machine dummy bar carriage structure in the method for automatic recovery of dummy bar chain in continuous casting according to the present invention; Figure 3 This is a schematic diagram of the hoist drive device in the method for automatic recovery of the siphon chain in continuous casting according to the present invention. Figure 4 This is a schematic diagram of the chain-type dummy bar structure in the continuous casting machine in the method for automatic recovery of the dummy bar chain in continuous casting according to the present invention; Figure 5 This is a positioning diagram of the hoisting device in the method for automatic recovery of the siphon chain in continuous casting according to the present invention; Figure 6 This is a diagram of the sector section of the continuous casting machine in the method for automatic recovery of the dummy chain in continuous casting according to the present invention; Figure 7 This is a schematic diagram of the continuous casting machine in a method for automatically recovering the siphon chain in continuous casting, as described in this invention.

[0019] In the diagram: 1. Ingot derrick chain; 2. Ingot derrick rod; 3. Front hook; 4. Rear hook; 5. Traction device motor; 6. Ingot derrick rod trolley motor; 7. Ingot derrick rod hook encoder; 8. Ingot derrick head; 9. Ingot derrick rod body; 10. Ingot derrick rod winch device; 11. Ingot derrick rod winch drive device; 12. Ingot derrick rod winch hook; 13. Winch encoder; 14. Upward stop position; 15. Insertion position; 16. Pre-position; 17. Downward stop position; 18. Crystallizer; 19. Ingot derrick trolley; 20. Clamping roller; 21. Winch lifting phototube; 22. Spare lifting phototube; 23. Sector segment. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0025] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0027] like Figures 1 to 7 As shown, the present invention provides a method for automatically recycling a continuous casting spool chain, comprising the following steps: S1. Insertion and status check of the ingot chain 1: After the ingot chain 1 is automatically inserted before casting begins, the ingot chain 1 is located below the crystallizer 18. The connection of the head of the ingot chain 1 is firm and there is no looseness or deformation, thus ensuring the continuity and stability of the entire automatic recycling process. S2. Signal Confirmation: Set the signal confirmation for the traction chain 1 through the PLC system, and check whether the signals of the winch encoder 13, the straightening motor encoder, the traction rod hook encoder 7, the photoelectric sensor, the limit switch and other signals are working properly, so as to provide a reliable basis for automatic recycling control. S3. Mode Selection: In the continuous casting machine's operation and control system, the operating mode of automatic dummy chain 1 can be selected via the HMI interface. When the casting flow begins, dummy chain 1 moves downwards under the drive of the straightener, and the equipment enters the corresponding automated retrieval program. S4. By installing an encoder on the straightening motor of the continuous casting machine, the PLC system accurately detects and positions the current position of the dummy bar chain 1, determining its actual position within the sector segment. Simultaneously, based on the position, the system automatically controls the clamping rollers 20 to close. When the position of the dummy bar chain 1 exceeds the corresponding clamping roller 20 closing value A, the clamping roller 20 automatically closes. The clamping roller 20 closing value A is shown in Table 1 below. Since the dummy bar chain 1 is under clamping rollers 20 1-4 when the casting machine starts, tracking begins from clamping roller 20 5. Table 1 of clamping roller closing values

[0028] S5. Control of the derrick winch 10 in sector 7: Through PLC programming, when the current position of the derrick chain 1 enters sector 7 (i.e., when the position of the derrick chain 1 is greater than 17440mm), the PLC outputs a signal to control the derrick winch drive 11, causing the derrick winch 10 to rapidly descend from the rising stop position 14 at a speed of 6m / min. During descent, the photoelectric switch installed at pre-position 16 and the winch encoder 13 provide feedback signals to detect in real time whether the derrick chain 1 has reached the pre-position 16. Once the PLC receives the signal from the pre-position 16, it immediately stops the descent of the derrick winch 10, ensuring it stops accurately at the pre-position 16. The pre-position 16 is set to 2000mm. This precise control ensures the accurate descent position of the derrick chain 1 during this stage, preparing for subsequent recovery steps. S6. The hoisting control of the derrick 10 in sector segment 13: When the current position of the derrick chain 1 enters sector segment 13, that is, when the position of the derrick chain 1 is greater than 30055mm, the PLC will trigger an output signal again to control the derrick hoisting drive device 11, causing the derrick hoisting device 10 to slowly descend from the preset position 16 at a speed of 3m / min. Similarly, during the descent, the photoelectric switch installed at the descent stop position 17 and the hoisting encoder 13 provide feedback signals to detect whether the derrick chain 1 has reached the descent stop position 17. When the PLC receives the signal from the descent stop position 17, it stops the descent action of the derrick hoisting device 10, stopping it at the descent stop position 17, which is set to 0mm. This segmented precise control can better adapt to the movement characteristics of the derrick chain 1 in different sector segments, ensuring the stability and accuracy of the derrick chain 1 throughout the entire recycling process. S7. Pulling Control of Pulling Chain 1: When the current position of the pulling chain 1 is detected to have entered the retrievable zone and the hoisting lifting phototube 21 is activated, this signal is defined as input signal I0.4. After receiving the upward signal of I0.4, the PLC outputs a signal to control the hoisting drive device to start the frequency converter, causing the pulling chain 1 to begin lifting. During the lifting process, the control system sends speed commands to the drive device through the PLC communication interface according to preset speed parameters to achieve precise speed control. Simultaneously, it continuously reads the feedback signal from the hoisting encoder 13 detection device and compares it with the preset lifting height parameters. When the actual position of the pulling chain 1 reaches the preset height of 13000mm from the billet, the hoisting speed becomes a high-speed 6m / min, ensuring that the pulling chain 1 can rise smoothly and detach from the billet. In addition, a backup lifting phototube 22 is provided as a backup in case of phototube failure, further improving the system's reliability. S8, Winch Insertion Position 15 Positioning: The proximity signal is defined as I0.5, based on signals from limit switches and the winch encoder 13 installed near the winch insertion position 15. When the PLC receives the rising edge of I0.5, it indicates that the derrick chain 1 has been lifted to near the predetermined winch insertion position 15. At this time, the PLC will reduce the speed of the winch drive according to a preset deceleration curve, causing the derrick chain 1 to slowly approach the final winch insertion position 15. During the approach process, feedback signals from the encoder are continuously monitored and precisely compared with the set value of the final winch insertion position 15 to achieve more precise position control, ensuring that the derrick chain 1 can accurately stop at the final winch insertion position 15, preparing for the derrick rod trolley to retrieve the derrick rod. S9. Retrieval of the derrick: The signal detected by the derrick trolley when the derrick chain 1 is lifted to the winch insertion position 15 is defined as input signal I0.6. When the PLC receives the rising edge signal of I0.6, the derrick trolley motor 6 controls the derrick trolley to start from the waiting position and move to the winch insertion position 15. Simultaneously, the traction device motor 5 drives the sprocket to rotate, causing the chain to move. The front hook 3 on the chain drives the derrick chain 1 to move along the predetermined track to the storage position. During the operation of the derrick trolley and the drive chain transmission mechanism, position monitoring and feedback are performed through corresponding limit switches or encoders to ensure that it can accurately run to the predetermined position, thereby successfully completing the derrick trolley retrieval work. S10. Storage of the siphon chain 1: When the siphon chain 1 reaches the storage stop position, the drive device stops working, accurately places the siphon chain 1 on the storage device, and secures it with a locking mechanism or other fixing device to prevent the siphon chain 1 from moving or falling during storage. This ensures the safety and stability of the siphon chain 1 during storage, allowing it to be in good standby condition at any time, ready for the next use.

[0029] In actual programming, various protection measures, such as overload protection and fault alarms, need to be considered to ensure the safe and stable operation of the system. Simultaneously, based on the specific hardware equipment and control requirements, corresponding adjustments and optimizations need to be made to the PLC's input / output point allocation, program logic, and parameter settings.

[0030] Furthermore, the traction device includes a traction device motor 5, a sprocket, and a chain. The chain is equipped with a front hook 3 and a rear hook 4. The traction rod car moves by traveling on the track through the wheels at its bottom. The start, stop, and positioning of the traction rod car are controlled by the feedback signal of the encoder on the traction rod car, ensuring that the traction rod car accurately reaches the winch insertion position 15.

[0031] Furthermore, such as Figure 6As shown, the sector segment consists of clamping rollers 20 numbered 1 to 13 from left to right, and their corresponding speed encoders, whose operating speed can be controlled by a PLC.

[0032] Furthermore, in step S3, the working mode of automatic recovery of the dummy chain 1 is selected through the HMI interface of the continuous casting machine operation control system. After the casting flow starts, when the straightening machine drives the dummy chain 1 to move downward, the drive rollers distributed in the fan-shaped section position work together with the detection and execution elements on the dummy bar car. The drive rollers control whether to press down the dummy chain 1 according to the movement state of the dummy chain 1, and pull the dummy chain 1 out of the fan-shaped section by rotating the drive rollers in the forward direction, providing conditions for the subsequent recovery step.

[0033] 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 them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for automatically recovering a continuous casting dummy bar chain, characterized in that, Includes the following steps: S1. Insertion and status check of the ingot chain: Before pouring, insert the ingot chain under the crystallizer to ensure that the head of the ingot chain is firmly connected and not loose. S2. Signal Confirmation: The working status of the hoist encoder, straightening motor encoder, traction chain hook encoder, photoelectric sensor and limit switch is detected by the PLC system. S3, Mode Selection: Select the automatic recovery mode in the continuous casting machine control system. After the casting flow starts, the siphon chain moves under the drive of the straightening machine. S4. Position detection of the traction chain and control of the clamping roller: The position of the traction chain in the sector section is located by the encoder of the straightening motor. When the position of the traction chain is greater than the closing value A of the corresponding clamping roller, the clamping roller is automatically closed and tracking starts from clamping roller No.

5. S5. The hoisting control of the dummy bar winch in the No. 7 sector section: When the current position of the dummy bar chain is detected to enter the No. 7 sector section, the dummy bar winch starts to descend from the rising stop position until it reaches the pre-position position and then stops. S6. The hoisting device of the dummy bar is controlled in the No. 13 sector section: When the current position of the dummy bar chain is detected to enter the No. 13 sector section, the dummy bar hoisting device starts to descend slowly from the pre-positioned position until it reaches the descent stop position and then stops. S7. Pulling Chain Lifting Control: When the current position of the pulling chain is detected to have entered the recyclable zone, and the pulling chain activates the hoisting phototube in that zone, the hoisting drive device is started to drive the pulling chain to rise. S8. Winch Insertion Position Positioning: When the derrick winch device is raised to near the predetermined winch insertion position, the lifting speed of the winch drive device is automatically reduced, so that the derrick chain slowly approaches and finally stops at the winch insertion position. S9. Retrieval of the traction bar trolley: When the traction bar trolley detects that the traction chain has stopped at the winch insertion position, the traction bar trolley starts from the waiting position and moves to the winch insertion position, and pulls the traction chain forward and onto the trolley through the traction device. S10. Storage of the traction chain: When the traction chain reaches the storage position, the traction drive device stops working, and the traction chain is automatically retrieved and ready for the next use.

2. The method for automatically recovering the dummy ingot chain in continuous casting according to claim 1, characterized in that, The closing value A in S4 is set according to the clamping roller number: the closing value A of clamping roller No. 5 is 1583mm, the closing value A of clamping roller No. 6 is 3584mm, the closing value A of clamping roller No. 7 is 5654mm, the closing value A of clamping roller No. 8 is 7769mm, the closing value A of clamping roller No. 9 is 9869mm, the closing value A of clamping roller No. 10 is 11969mm, the closing value A of clamping roller No. 11 is 14069mm, the closing value A of clamping roller No. 12 is 16169mm, the closing value A of clamping roller No. 13 is 18269mm, the closing value A of clamping roller No. 14 is 20369mm, and the closing value A of clamping roller No. 15 is 22469mm.

3. The method for automatically recovering the dummy ingot chain in continuous casting according to claim 1, characterized in that, In S5, the entry of the traction chain into the No. 7 sector segment specifically means that the position of the traction chain is greater than 17440mm; the descent speed of the traction rod winch is set to 6m / min; and the pre-positioning is set to 2000mm.

4. The method for automatically recovering the dummy ingot chain in continuous casting according to claim 1, characterized in that, In S6, the entry of the traction chain into the No. 13 sector segment specifically means that the position of the traction chain is greater than 30055mm; the slow descent speed of the traction rod winch is set to 3m / min; and the descent stop position is set to 0mm.

5. The method for automatically recovering the dummy ingot chain in continuous casting according to claim 1, characterized in that, In step S7, the initial speed of the ingot chain lifting is consistent with the continuous casting speed; during the lifting process, the feedback signal of the winch motor encoder is continuously read and compared with the preset lifting height parameter. When the actual position of the traction chain reaches the preset separation height of 13000mm from the billet, the lifting speed of the winch drive device is adjusted to 6m / min to ensure that the traction chain smoothly separates from the billet. In addition, S7 is also equipped with a spare winch lifting phototube, which is used to replace the winch lifting phototube in triggering the traction chain lifting operation when the winch lifting phototube fails, so as to ensure the reliability of the system.

6. The method for automatically recovering the dummy ingot chain in continuous casting according to claim 1, characterized in that, In step S8, the limit switch installed near the winch insertion position and the feedback signal from the winch motor encoder determine whether the derrick winch device is close to the winch insertion position. When the limit switch and the hoist motor encoder are received, the speed of the hoist drive device is reduced according to the preset deceleration curve, and the feedback signal of the hoist motor encoder is continuously monitored and accurately compared with the set value of the hoist insertion position to ensure that the lead chain stops accurately at the hoist insertion position.

7. The method for automatically recovering the dummy ingot chain in continuous casting according to claim 1, characterized in that, In S9, the traction device includes a traction device motor, a sprocket, and a chain. The chain is equipped with a front hook and a rear hook. The traction rod car moves by traveling on the track through the wheels at its bottom. The start, stop, and positioning of the traction rod car are controlled by the feedback signal of the encoder on the traction rod car to ensure that the traction rod car accurately reaches the winch insertion position.

8. The method for automatically recovering the dummy ingot chain in continuous casting according to claim 1, characterized in that, The control processes from S2 to S9 are implemented through a PLC system; In S2, the PLC system collects signals from the encoder of the straightening motor, the photoelectric sensor on the roller conveyor, the encoder of the hoisting motor, the proximity switch and the encoder on the derrick car, and confirms the validity of the signals. In step S4, the PLC system calculates the actual position of the traction chain through the feedback signal from the encoder of the straightening motor, and outputs a control signal to the drive mechanism of the clamping roller according to the actual position, so as to realize the automatic control of the opening and closing of the clamping roller.

9. A method for automatically recovering a continuous casting dummy bar chain according to claim 8, characterized in that, The PLC system also has overload protection and fault alarm functions. When an overload or abnormal signal is detected, it immediately outputs a stop signal to the corresponding drive device and issues an alarm prompt.

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