Control method and system for rapid tapping of heating furnace

Abstract

The invention discloses a control method and system for rapid tapping of a heating furnace, and belongs to the technical field of steel rolling heating furnace technologies, and the control method comprises the steps that S1, in the advancing process of a walking beam, a laser sensing device sends a plate blank advancing in-place signal to a PLC control system, the walking beam descends, and a tapping signal is sent to a furnace door driving device; s2, a furnace door driving device is started, when the tapping furnace door is opened to a limiting switch, the limiting switch sends a furnace door stopping signal, and the tapping furnace door stops moving; the PLC control system controls the tapping machine to enter the furnace; s3, after the tapping machine enters a specified position in the furnace, a tapping furnace door is opened to the highest position; meanwhile, the steel discharging machine ascends and supports the plate blank; s4, the tapping machine retreats, and after the PLC receives a retreating signal of the tapping machine, the stepping beam starts to act in the next period; the technical problems that in the prior art, actions of all executing mechanisms are completely isolated, a large amount of unnecessary waiting time and heat are consumed in the steel tapping process, and the production efficiency is low are mainly solved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel rolling heating furnace technology, and in particular relates to a control method and system for rapid steel tapping from a heating furnace. Background Art

[0002] In the hot rolling production line, the heating furnace is the key equipment to heat the slab to the temperature required for rolling. The steel-out process refers to the entire process of transporting the heated slab from the furnace to the steel-out roller.

[0003] At present, the three heating furnaces of the hot rolling 1750 rolling line use the interlocking action scheme designed when they were put into production for steel tapping control. The specific process of this scheme is: first, the walking beam transports the slab to the laser detection point on the steel tapping side. After the laser sensor detects the slab in place signal, the walking beam retreats to the rear lower position and starts the steel tapping signal, then the steel tapping furnace door rises to the highest position, then the steel tapping machine starts and extends into the predetermined position in the furnace to lift the slab out to the steel tapping roller, and finally the steel tapping machine descends and retreats to the position and closes the steel tapping furnace door, and the walking beam starts the stepping action.

[0004] The existing technology adopts a strict sequential control mode, that is, the next action can only be started after the previous action is completely completed, and there is no overlap between the two actions. This control method has the following technical problems:

[0005] First, each action is executed completely independently, and the actions of each execution component are completely isolated, which fails to fully utilize the motion characteristics of the equipment to achieve action overlap, resulting in a long steel-making process;

[0006] Second, in the prior art, the steel-discharging furnace door is directly opened to the maximum position, which not only causes the high-temperature furnace gas to leak out quickly and a large amount of cold air to enter, causing safety hazards and energy waste, but also takes a long time to open, affecting production efficiency. Summary of the invention

[0007] The purpose of the present invention is to provide a control method and system for rapid steel tapping from a heating furnace, so as to solve the technical problem proposed in the above background technology that the actions of various actuators in the steel tapping process of the existing heating furnace are completely isolated, which not only causes a large amount of unnecessary waiting time in the steel tapping process, but also the furnace door is directly opened to the maximum position, causing energy waste and safety hazards, and seriously affecting production efficiency.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A control method for rapid steel tapping from a heating furnace, comprising:

[0010] S1, during the advancement of the walking beam, when the slab reaches the designated position, the laser sensor device is triggered, and the laser sensor device sends a signal that the slab has advanced to the designated position to the PLC control system, and the PLC control system sends a driving instruction to the walking beam driving device; after receiving the signal that the slab has advanced to the designated position, the walking beam driving device controls the walking beam to stop advancing and descend, and returns a signal that the walking beam has descended to the PLC control system; after receiving the signal that the walking beam has descended, the PLC control system sends a driving instruction to the furnace door driving device;

[0011] S2, the furnace door drive device starts after receiving the steel-out signal, controls the steel-out furnace door to rise and open, and when the steel-out furnace door opens to the limit switch, the limit switch is triggered, and the limit switch sends a furnace door stop signal to the furnace door drive device and the PLC control system, and the furnace door drive device controls the steel-out furnace door to stop moving; after receiving the furnace door stop signal, the PLC control system sends a drive instruction to the steel-out machine drive device, and the steel-out machine drive device controls the steel-out machine to enter the furnace;

[0012] S3, after the steel-discharging machine enters the designated position in the furnace, the PLC control system sends a driving instruction to control the furnace door driving device, and the furnace door driving device controls the steel-discharging furnace door to continue opening until the steel-discharging furnace door rises to the highest position; at the same time, the PLC control system sends a driving instruction to the steel-discharging machine driving device, and the steel-discharging machine driving device controls the steel-discharging machine to rise and hold up the slab;

[0013] S4, after the steel-outlet machine lifts up the slab, the steel-outlet machine driving device controls the steel-outlet machine to retreat, and at the same time returns the steel-outlet machine retreat signal to the PLC control system. After receiving the steel-outlet machine retreat signal, the PLC control system sends a driving instruction to the walking beam driving device, and the walking beam driving device controls the walking beam to start the next cycle action.

[0014] Preferably, the limit switch is arranged at the midpoint of the total stroke of the steel-out furnace door.

[0015] Preferably, the steel-outlet furnace door is opened and closed by hydraulically driven chain lifting.

[0016] Preferably, the laser sensing device adopts an infrared laser sensor.

[0017] Preferably, the steel-out furnace door is closed by directly descending to the lowest point.

[0018] Preferably, the walking beam adopts an electro-hydraulic proportional valve to control the speed, the steel-making machine adopts a variable frequency motor to control the translation speed, and adopts hydraulic pressure to control the lifting speed.

[0019] A control system for rapid steel tapping in a heating furnace, used to implement the above control method, the control system comprising:

[0020] PLC control system;

[0021] The laser sensor device arranged on the advancing path of the slab is used to detect the in-place status of the slab. The reason why the walking beam stops advancing after the in-place status is to fix the stopping position of the slab.

[0022] A walking beam drive device electrically connected to the PLC control system;

[0023] A steel-out furnace door driven by a furnace door driving device, wherein a limit switch is arranged at the midpoint of the movement stroke of the steel-out furnace door, and the limit switch is electrically connected to the PLC control system;

[0024] A steel tapping machine driven by a steel tapping machine driving device, wherein the steel tapping machine is electrically connected to a PLC control system; wherein:

[0025] The input end of the PLC control system is respectively connected to the laser sensor device and the limit switch, and the output end is respectively connected to the stepping beam driving device, the furnace door driving device, and the steel tapping machine driving device.

[0026] Preferably, the walking beam driving device is hydraulically driven, the furnace door driving device is hydraulically driven, and the steel tapping machine driving device includes a variable frequency motor drive for translational drive and a hydraulic drive for lifting drive.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention mainly solves the technical problem that the actions of various actuators in the existing heating furnace during the steel-tapping process are completely isolated, which not only causes a large amount of unnecessary waiting time in the steel-tapping process, but also causes energy waste and safety hazards when the furnace door is directly opened to the maximum position, seriously affecting production efficiency.

[0029] Specifically, the present invention solves the problem through the following three technical improvements: first, by synchronously starting the steel-out signal when the walking beam starts to descend, the problem of discontinuous action connection is solved, so that the steel-out furnace door can be opened in advance; secondly, by adding a limit point of the half-open limit switch of the furnace door during the action of the steel-out furnace door, the original direct opening to the highest position is changed to a two-stage opening action, which optimizes the furnace door opening process and reduces heat loss; finally, by synchronously starting the stepping beam periodic action during the backward process of the steel-out machine, effective overlap of equipment actions is achieved.

[0030] Under the premise of ensuring equipment safety, these technical improvements have achieved reasonable overlap in the actions of the walking beam, steel tapping machine and steel tapping furnace door, significantly improved production efficiency, and reduced the time required for the overall steel tapping action by about 60 seconds. This not only optimizes the production rhythm, but also brings considerable economic benefits to the company. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a schematic diagram of a method flow of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0033] like Figure 1 As shown:

[0034] A control method for rapid steel tapping from a heating furnace, comprising:

[0035] A laser sensor is arranged on the steel-out side to detect whether the slab is in place. The laser sensor adopts an infrared laser sensor.

[0036] S1, during the advancement of the walking beam, when the slab reaches the designated position, the laser sensor device is triggered, and the laser sensor device sends a signal that the slab has advanced to the designated position to the PLC control system, and the PLC control system sends a driving instruction to the walking beam driving device; after receiving the signal that the slab has advanced to the designated position, the walking beam driving device controls the walking beam to stop advancing and descend, and returns a signal that the walking beam descends to the PLC control system; after receiving the signal that the walking beam has descended, the PLC control system sends a driving instruction to the furnace door driving device; the walking beam driving device is hydraulically driven, and the speed of the walking beam is controlled by an electro-hydraulic proportional valve.

[0037] Specifically, the laser sensing device uses an infrared laser sensor, which has the characteristics of high temperature resistance, good stability and long life, and can adapt to the harsh working environment of the heating furnace. When the slab reaches the specified position, the laser sensing device sends a signal in time to ensure the accuracy of the slab stop position and avoid the failure of the subsequent steel-making machine to support the slab due to position deviation. The walking beam adopts a hydraulic drive with an electro-hydraulic proportional valve. It not only has the characteristics of large thrust, but also can achieve smooth speed adjustment and reduce the impact during movement. The steel-making signal is triggered at the same time as the walking beam begins to descend, breaking the traditional serial mode in which the walking beam must descend and retreat to the rear lower position to trigger the steel-making signal, effectively shortening the action sequence. The entire process is coordinated by the PLC control system, which not only ensures the safety of system operation, but also improves production efficiency.

[0038] S2, add a limit switch in the movement stroke of the furnace door. The limit switch is set at the midpoint of the total stroke of the steel-out furnace door.

[0039] The furnace door driving device starts after receiving the steel-out signal, controls the steel-out furnace door to rise and open, and when the steel-out furnace door opens to the limit switch, the limit switch is triggered, and the limit switch sends a furnace door stop signal to the furnace door driving device and the PLC control system, and the furnace door driving device controls the steel-out furnace door to stop moving; after receiving the furnace door stop signal, the PLC control system sends a driving instruction to the steel-out machine driving device, and the steel-out machine driving device controls the steel-out machine to enter the furnace; the furnace door driving device is hydraulically driven, and the steel-out furnace door is opened and closed by hydraulically driven chain lifting;

[0040] Specifically, by setting a limit switch at the midpoint of the total stroke of the furnace door, the sectional opening control of the furnace door can be realized. When the furnace door rises to a certain height and triggers the limit switch, the system immediately controls the steel-discharging machine to enter the furnace without waiting for the furnace door to be fully opened. On the one hand, this sectional opening method ensures the safety of the steel-discharging machine entering and avoids equipment collision caused by insufficient opening of the furnace door; on the other hand, it greatly reduces the duration of the furnace door being fully opened and reduces heat loss. The furnace door adopts a hydraulically driven chain lifting method, which has the characteristics of high reliability and easy maintenance. The limit switch not only serves as the basis for position judgment, but also provides real-time status feedback for the system, which is convenient for coordinated control by the PLC control system. By optimizing the action sequence of furnace door opening and steel-discharging machine entry, the steel-discharging efficiency is significantly improved, and energy consumption is also reduced.

[0041] S3, after the steel-discharging machine enters the designated position in the furnace, the PLC control system sends a driving instruction to control the furnace door driving device, and the furnace door driving device controls the steel-discharging furnace door to continue opening until the steel-discharging furnace door rises to the highest position; at the same time, the PLC control system sends a driving instruction to the steel-discharging machine driving device, and the steel-discharging machine driving device controls the steel-discharging machine to rise and hold up the slab; the steel-discharging machine translation driving device is a variable frequency motor, and the lifting driving device is hydraulic.

[0042] Specifically, S3 embodies the parallel control advantage of this system. Through the unified coordination of the PLC control system, the two actions of the furnace door continuing to open and the steel-making machine supporting the billet are realized synchronously. The steel-making machine adopts variable frequency motor drive, which has significant advantages: its good starting characteristics and speed adjustment ability ensure the stability of the billet supporting process and avoid impact damage to the high-temperature slab; at the same time, variable frequency speed regulation has the characteristics of energy saving and environmental protection, and can save 15% to 20% of energy consumption compared with the traditional drive method. The furnace door completes the final opening stroke at this stage, ensuring that there is enough working space for the steel-making machine to support the slab. The whole process is monitored in real time by the PLC system, which ensures the coordination of the action and can respond to abnormal situations in time, reflecting the reliability and safety of automatic control. This parallel control method not only shortens the operation cycle, but also improves the quality of steel-making through precise action control.

[0043] This segmented opening method not only ensures the safety of access to the steel-making machine, but also reduces the duration of full opening of the furnace door.

[0044] S4, after the steel-outlet machine lifts up the slab, the steel-outlet machine driving device controls the steel-outlet machine to retreat, and at the same time returns the steel-outlet machine retreat signal to the PLC control system. After receiving the steel-outlet machine retreat signal, the PLC control system sends a driving instruction to the walking beam driving device, and the walking beam driving device controls the walking beam to start the next cycle action.

[0045] Specifically, by triggering the next cycle of the stepping beam while the steel machine retreats, the traditional serial waiting mode is broken, reflecting the innovation of this solution in optimizing the timing of actions. This parallel operation mode not only significantly shortens the production cycle, but also reduces the idle waiting time of the equipment and improves the equipment utilization rate. At the same time, due to the reduction of unnecessary waiting time, the furnace door opening time is also reduced, the heat loss is reduced, and it has a significant energy-saving effect. The PLC control system plays a key role in this process. Through precise signal control and status monitoring, it ensures the coordination and safety of the actions of each mechanism.

[0046] This method achieves three key action overlap optimizations:

[0047] The first is the overlap of the descending of the walking beam and the steel-out signal. When the walking beam starts to descend, the steel-out signal is triggered, causing the steel-out furnace door to start rising, breaking the traditional serial mode in which the walking beam must descend and retreat to the rear lower position to trigger the steel-out signal.

[0048] The second point is the coincidence of the furnace door opening and the steel tapping machine entering. By setting a limit point at the midpoint of the furnace door movement, the furnace door can be opened in sections, so that the steel tapping machine can start to enter the furnace when the furnace door reaches half-open, without waiting for the furnace door to be fully opened to the highest position.

[0049] The third is the overlap of the steel-out machine's retreat and the new cycle of the walking beam. When the steel-out machine starts to retreat, it triggers the next cycle of the walking beam, while continuing to perform the descending action and closing the furnace door synchronously, breaking the traditional serial mode that the steel-out machine must retreat completely to the rear lower position before starting the walking beam.

[0050] Second preferred embodiment:

[0051] A control system for rapid steel tapping in a heating furnace, used to implement the control method described in the first embodiment, the control system comprising:

[0052] PLC control system;

[0053] The laser sensor device arranged on the advancing path of the slab is used to detect the in-place status of the slab. The reason why the walking beam stops advancing after the in-place status is to fix the stopping position of the slab.

[0054] A walking beam drive device electrically connected to the PLC control system;

[0055] A steel-out furnace door driven by a furnace door driving device, wherein a limit switch is arranged at the midpoint of the movement stroke of the steel-out furnace door, and the limit switch is electrically connected to the PLC control system;

[0056] A steel tapping machine driven by a steel tapping machine driving device, wherein the steel tapping machine is electrically connected to a PLC control system; wherein:

[0057] The input end of the PLC control system is respectively connected to the laser sensor device and the limit switch, and the output end is respectively connected to the stepping beam driving device, the furnace door driving device, and the steel tapping machine driving device.

[0058] The walking beam driving device is hydraulically driven, the furnace door driving device is hydraulically driven, and the steel tapping machine driving device includes a variable frequency motor drive for translational drive and a hydraulic drive for lifting drive.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling rapid steel tapping from a heating furnace, characterized in that: include: S1, during the advancement of the walking beam, when the slab reaches the designated position, the laser sensor device is triggered, and the laser sensor device sends a signal that the slab has advanced to the designated position to the PLC control system, and the PLC control system sends a driving instruction to the walking beam driving device; after receiving the signal that the slab has advanced to the designated position, the walking beam driving device controls the walking beam to stop advancing and descend, and returns a signal that the walking beam has descended to the PLC control system; after receiving the signal that the walking beam has descended, the PLC control system sends a driving instruction to the furnace door driving device; S2, the furnace door drive device starts after receiving the steel-out signal, controls the steel-out furnace door to rise and open, and when the steel-out furnace door opens to the limit switch, the limit switch is triggered, and the limit switch sends a furnace door stop signal to the furnace door drive device and the PLC control system, and the furnace door drive device controls the steel-out furnace door to stop moving; after receiving the furnace door stop signal, the PLC control system sends a drive instruction to the steel-out machine drive device, and the steel-out machine drive device controls the steel-out machine to enter the furnace; S3, after the steel-discharging machine enters the designated position in the furnace; the PLC control system sends a driving instruction to control the furnace door driving device, and the furnace door driving device controls the steel-discharging furnace door to continue opening until the steel-discharging furnace door rises to the highest position; at the same time, the PLC control system sends a driving instruction to the steel-discharging machine driving device, and the steel-discharging machine driving device controls the steel-discharging machine to rise and hold up the slab; S4, after the steel-outlet machine lifts up the slab, the steel-outlet machine driving device controls the steel-outlet machine to retreat, and at the same time returns the steel-outlet machine retreat signal to the PLC control system. After receiving the steel-outlet machine retreat signal, the PLC control system sends a driving instruction to the walking beam driving device, and the walking beam driving device controls the walking beam to start the next cycle action.

2. The control method for rapid steel tapping from a heating furnace according to claim 1, characterized in that: The limit switch is arranged at the midpoint of the total travel of the steel-discharging furnace door.

3. The control method for rapid steel tapping from a heating furnace according to claim 1, characterized in that: The steel-out furnace door is opened and closed by hydraulically driven chain lifting.

4. The control method for rapid steel tapping from a heating furnace according to claim 1, characterized in that: The laser sensing device adopts an infrared laser sensor.

5. The method for controlling rapid steel tapping from a heating furnace according to claim 1, characterized in that: The closing process of the steel-out furnace door is to directly drop it to the lowest point.

6. The method for controlling rapid steel tapping from a heating furnace according to claim 1, characterized in that: The speed of the stepping beam is controlled by an electro-hydraulic proportional valve; the speed of the steel-making machine is controlled by a variable frequency motor, and the speed of the steel-making machine is controlled by hydraulic pressure.

7. A control system for rapid steel tapping from a heating furnace, characterized in that: For implementing the control method according to any one of claims 1 to 6, the control system comprises: PLC control system; A laser sensor device is arranged on the advancing path of the slab, which is used to detect the position of the slab so that the position where the slab stops is fixed; A walking beam drive device electrically connected to the PLC control system; A steel-out furnace door driven by a furnace door driving device, wherein a limit switch is arranged at the midpoint of the movement stroke of the steel-out furnace door, and the limit switch is electrically connected to the PLC control system; A steel tapping machine driven by a steel tapping machine driving device, wherein the steel tapping machine is electrically connected to a PLC control system; wherein: The input end of the PLC control system is respectively connected to the laser sensor device and the limit switch, and the output end is respectively connected to the stepping beam driving device, the furnace door driving device, and the steel tapping machine driving device.

8. The control system for rapid steel tapping from a heating furnace according to claim 7, characterized in that: The walking beam driving device is hydraulically driven, the furnace door driving device is hydraulically driven, and the steel tapping machine driving device includes a variable frequency motor drive for translational drive and a hydraulic drive for lifting drive.

Images