Control method and system for taking steel from a heavy billet in a walking beam furnace

Abstract

Embodiments of the present application provide a kind of step-by-step heating furnace heavy billet steel taking control method and system, it is related to billet heating furnace field.The purpose is to improve the weight of heating furnace blank, it is difficult to cause steel tapping machine to tap and the problem of large equipment upgrading investment.Step-by-step heating furnace heavy billet steel taking control method includes obtaining the weight signal of billet on step beam;Obtain the overflow amount of billet on step beam;According to weight signal, the lifting position of steel tapping machine taking arm, lifting position oil pressure and backward oil pressure are controlled;According to weight signal and overflow amount, the billet discharge stroke of step beam billet transfer and the steel taking stroke of steel tapping machine taking arm are controlled.Step-by-step heating furnace heavy billet steel taking system is used to implement the method described above.Through the control method, it is not necessary to move any facility, it will not require to stop furnace, only requires that technical personnel upgrades control scheme and procedure, and it can be completed to adjust heavy billet steel taking by downloading program debugging during overhaul.

Description

Technical Field

[0001] This invention relates to the field of billet heating furnaces, and more specifically, to a control method and system for rebar extraction from a walking beam furnace. Background Technology

[0002] During the process of the walking beam in the heating furnace conveying the billet to the furnace head (discharge side), if the furnace head optical detector detects the billet signal, the conveying process in the furnace will stop, the discharge furnace door will open, the tapping machine (also called the steel taker) will advance to the furnace head under the slab, the steel taker arm will rise to receive the slab, and then carry the billet back to the outside of the furnace. The tapping machine will then descend to place the billet on the roller conveyor outside the furnace. The whole process is in automatic control mode.

[0003] With the improvement of the company's production line technology, the maximum weight of the heating furnace billet has increased to 32 tons, exceeding the original design maximum billet weight of 28 tons. This has led to problems such as the steel tapping machine failing to rise properly when receiving steel billets weighing more than 28 tons, hydraulic oil pipe bursting, excessive torque and overcurrent in the transverse motor when supporting the billet and retracting, and steel dropping, resulting in unsmooth automatic steel tapping and affecting production.

[0004] As process and product requirements change, corresponding equipment or automatic control technologies must also be upgraded. Upgrading equipment typically requires modifications to a lot of infrastructure, such as civil engineering and power supply, which necessitates shutting down the furnace for many days and requires a significant investment of human, material, and financial resources. Summary of the Invention

[0005] The present invention aims to provide, for example, a method for controlling the removal of heavy billets from a walking beam furnace, which can improve the problem of increased billet weight in the furnace leading to difficulties in steel tapping and high investment in equipment upgrades.

[0006] The present invention also aims to provide a walking beam furnace billet tapping system that can improve the problem of increased billet weight in the furnace, which leads to difficulties in tapping steel and high investment in equipment upgrades.

[0007] The embodiments of the present invention can be implemented as follows: An embodiment of the present invention provides a method for controlling the removal of steel from heavy billets in a walking beam furnace, comprising: Obtain the weight signal of the steel billet on the walking beam; Obtain the overflow amount of steel billet from the walking beam; Based on the weight signal, the rising position, rising position hydraulic pressure, and retraction hydraulic pressure of the steel-taking arm of the steel-exiting machine are controlled; Based on the weight signal and the steel overflow amount, the billet discharge stroke of the walking beam and the steel taking stroke of the steel taking arm of the steel tapping machine are controlled. The walking beam is installed inside the heating furnace and is used to transport steel billets. The tapping machine is located downstream of the heating furnace and is used to receive the steel billets on the walking beam and transport them downstream. The overflow amount is the distance from the tapping inspection position at the furnace head to the pre-stop position, the billet travel distance is the distance from the tapping inspection position at the furnace head to the actual stop position, and the billet removal travel distance is the distance from the initial position to the billet receiving position. The billet removal travel distance is less than the distance from the tapping inspection position at the furnace head to the furnace discharge door.

[0008] In addition, the control method for rebar extraction in a walking beam furnace provided in the embodiments of the present invention may also have the following additional technical features: Optionally, the step of controlling the rising position, rising position hydraulic pressure, and retraction hydraulic pressure of the steel tapping arm based on the weight signal includes: If the weight of the steel billet is less than the preset weight, the steel taking arm is controlled to rise to the preset height, and the lifting oil pressure and the retraction oil pressure are controlled to be at the first preset value. If the weight of the steel billet is greater than the preset weight, the steel taking arm is controlled to rise to the preset height, and the lifting oil pressure and the retraction oil pressure are controlled to be at the second preset value. Wherein, the first preset value is less than the second preset value, and the first preset value and the second preset value respectively correspond to the supporting force required to generate the weight of the steel billet.

[0009] Optionally, the step of controlling the steel billet arm to rise to a preset height and controlling the lifting and retraction hydraulic pressures to a second preset value if the weight of the steel billet is greater than a preset weight includes: If the weight of the steel billet is greater than the preset weight, the steel taking arm rises to the preset height, and the hydraulic pressure at the rising position is at the second preset value, then the steel taking arm is controlled to retract; if the hydraulic pressure at the rising position is less than the second preset value during the retraction process, the steel taking arm is raised to the preset height and the hydraulic pressure at the rising position is controlled to be at the second preset value, until the steel taking arm retracts to the correct position.

[0010] Optionally, the step of controlling the steel billet arm to rise to a preset height and controlling the lifting and retraction hydraulic pressures to a second preset value if the weight of the steel billet is greater than a preset weight further includes: If the weight of the steel billet is greater than the preset weight, the stroke of the hydraulic cylinder of the steel-picking arm is controlled to be at 96%.

[0011] Optionally, the preset weight is 28 tons.

[0012] Optionally, the step of controlling the billet discharge stroke of the walking beam conveying the billet and the steel-retrieving stroke of the steel-retrieving arm of the steel-retrieving machine based on the weight signal and the steel overflow amount includes: If the weight of the billet is greater than the preset weight, and the amount of steel overflow is greater than the preset overflow amount, the walking beam is controlled to stop. If the weight of the billet is greater than the preset weight and the overflow amount is less than the preset overflow amount, then the walking beam is controlled to move the billet for one cycle until the overflow amount is greater than the preset overflow amount. Wherein, at least two of the preset overflow amounts + one cycle stroke are less than the distance from the furnace head tapping light inspection position to the heating furnace tapping door.

[0013] Optionally, the preset overflow amount is 100mm, and the circulation stroke is 550mm or 600mm.

[0014] Optionally, the step of controlling the billet discharge stroke of the walking beam conveying the billet and the steel taking stroke of the steel tapping arm of the tapping machine based on the weight signal and the steel overflow amount further includes: If the weight of the steel billet is greater than the preset weight, the steel taking stroke of the steel taking arm is controlled according to the steel taking length being two-thirds of the steel taking arm length; wherein, the steel taking length is the length occupied by the steel billet on the steel taking arm.

[0015] Optionally, the laser signal from the light inspection at the tapping position of the furnace head is subjected to anti-interference processing and filtering; and a backflushing gas source is used at the measurement cavity position.

[0016] An embodiment of the present invention also provides a walking beam furnace billet rebar extraction system. The walking beam furnace billet rebar extraction system includes a furnace, a tapping machine, a pressure holding device, and a controller. The tapping machine is located downstream of the furnace, and the pressure holding device is mounted on the tapping machine. The pressure holding device is electrically connected to the controller, which controls the rising oil pressure and the retracting oil pressure through the pressure holding device. The controller is used to execute the walking beam furnace billet rebar extraction control method.

[0017] The beneficial effects of the control method and system for rebar extraction in a walking beam furnace according to embodiments of the present invention include, for example: The control method for rebar removal in a walking beam furnace includes acquiring the weight signal of the billet on the walking beam; acquiring the overflow amount of the billet on the walking beam; controlling the rising position, rising position hydraulic pressure, and retraction hydraulic pressure of the tapping arm based on the weight signal; and controlling the billet removal stroke of the walking beam and the tapping stroke of the tapping arm based on the weight signal and the overflow amount.

[0018] Based on the billet weight, parameters corresponding to that weight are generated to control the rising position, rising hydraulic pressure, and retraction hydraulic pressure of the tapping arm. This prevents malfunctions such as incomplete rising, hydraulic pipe bursts, excessive torque and overcurrent in the transverse motor during the retraction of heavy billets, and steel dropping, which could disrupt automatic steel tapping and affect production. The adjustment and control system automatically identifies light and heavy billets. When tapping heavy billets, the system controls the billet tapping and steel taking strokes, using leverage principles to reduce the load on the tapping arm head. This addresses the problem of increased billet weight in the heating furnace leading to greater difficulty in tapping and higher equipment upgrade costs.

[0019] The walking beam furnace billet tapping system is used to implement the above method, which can improve the problem of increased billet weight in the furnace, which leads to difficulties in tapping steel and large investment in equipment upgrades. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structural design of the walking beam furnace billet extraction system provided in this embodiment; Figure 2 This is a flowchart illustrating the steps of the control method for rebar extraction in a walking beam furnace provided in this embodiment. Figure 3 The flowchart of the judgment and execution of the steel taking arm in the control method for heavy billet taking in the walking beam furnace provided in this embodiment; Figure 4 The flowchart shows the judgment and execution process of the walking beam in the control method for rebar extraction in the walking beam heating furnace provided in this embodiment.

[0022] Icons: 10- Walking beam furnace billet rebar removal system; 100- Heating furnace; 110- Furnace door; 11- Billet; 200- Optical inspection; 210- Reflector; 300- Roller conveyor; 400- Trolley; 410- Rebar removal arm. Detailed Implementation

[0023] 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 components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0028] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0029] The following is combined Figures 1 to 4 The control method for rebar extraction in a walking beam furnace provided in this embodiment is described in detail.

[0030] Please refer to Figure 1 and Figure 2 The present invention provides a method for controlling the removal of steel from heavy billets in a walking beam furnace, comprising: Step S1: Obtain the weight signal of the steel billet 11 on the walking beam; Step S2: Obtain the overflow amount of steel billet 11 on the walking beam; Step S3: Based on the weight signal, control the rising position, rising position hydraulic pressure and retraction hydraulic pressure of the steel taking arm 410 of the steel output machine 400. Step S4: Based on the weight signal and the amount of steel overflow, control the billet discharge stroke of the walking beam conveying billet 11 and the steel taking stroke of the steel taking arm 410 of the steel tapping machine 400. The walking beam is installed inside the heating furnace 100 and is used to transport the billet 11. The tapping machine 400 is located downstream of the heating furnace 100 and is used to receive the billet 11 on the walking beam and transport it downstream. The overflow amount is the distance from the tapping inspection position 200 to the pre-stop position, the billet stroke is the distance from the tapping inspection position 200 to the actual stop position, and the steel taking stroke is the distance from the initial position to the position where the steel taking arm 410 receives the billet 11. The billet taking stroke is less than the distance from the tapping inspection position 200 to the discharge door 110 of the heating furnace 100.

[0031] A light sensor 200 is installed at the furnace head tapping inspection position 200 to detect the position of the billet 11. A reflector 210 is correspondingly installed at the light sensor 200. The walking beam moves the billet 11 to the furnace door 110 of the heating furnace 100 for exiting the furnace. It then moves to the furnace head tapping inspection position 200, where the light sensor 200 detects the position of the billet 11. The walking beam continues to move the billet until it stops. Then, the steel-retrieving arm 410 of the tapping machine 400 starts moving forward, rises, retrieves the billet, retracts, and then lowers to place it on the roller conveyor 300 outside the heating furnace 100. The walking beam's movement consists of rising, translating, retracting, and lowering; the steel-retrieving arm 410's movement consists of moving forward, rising, retracting, and lowering. The billet tapping stroke is less than the distance from the furnace head tapping inspection position 200 to the furnace door 110 of the heating furnace 100. Tapping always takes place inside the heating furnace 100, and the steel-retrieving arm 410 of the tapping machine 400 needs to extend into the heating furnace 100 to retrieve the billet.

[0032] Reference Figure 1 The steel-taking stroke Y of the tapping machine 400 is calculated as Y = L - ΔX + slab width / 2, where L is the distance from the tapping light detector 200 at the furnace head to the initial position of the tapping machine 400, and ΔX is the overflow amount. During the movement of the walking beam carrying the slab towards the tapping furnace door 110, the light detector 200 is triggered, triggering an upward signal. At this point, the current walking beam distance X1 is recorded. The walking beam continues to deliver steel forward. After reaching its destination, the walking beam descends, and the current walking beam distance X2 is recorded. Therefore, the overflow amount ΔX = X2 - X1. This calculation assumes a single ΔX. When there are multiple ΔX values, they need to be accumulated.

[0033] Based on the weight of the billet 11, parameters corresponding to the weight of the billet 11 are generated to control the rising position, rising position hydraulic pressure and retraction hydraulic pressure of the steel taking arm 410 of the steel tapping machine 400. This avoids malfunctions such as insufficient rising position, hydraulic oil pipe bursting, excessive torque and overcurrent of the transverse motor when supporting the billet during retraction, and steel dropping, which would cause the automatic steel tapping to be unsmooth and affect production.

[0034] The adjustment and control system automatically identifies light billets and heavy billets. When taking steel from heavy billets, the billet exit stroke and steel taking stroke are controlled, and the lever principle is used to reduce the load on the 400-meter boom of the steel tapping machine.

[0035] This control method requires no changes to any facilities and does not require furnace shutdown. It only requires technicians to upgrade the control scheme and program, and the adjustment of steel extraction from heavy billets can be completed by downloading and debugging the program during maintenance.

[0036] Reference Figure 1 and Figure 2 In this embodiment, step S3, based on the weight signal, controls the rising position, rising position hydraulic pressure, and retraction hydraulic pressure of the steel-taking arm 410 of the steel-exiting machine 400, including: Step S31: If the weight of the billet 11 is less than the preset weight, control the steel taking arm 410 to rise to the preset height, and control the rising position oil pressure and the retraction oil pressure to be at the first preset value. Step S32: If the weight of the billet 11 is greater than the preset weight, control the steel taking arm 410 to rise to the preset height, and control the rising position oil pressure and the retraction oil pressure to the second preset value. The first preset value is less than the second preset value, and the first preset value and the second preset value respectively correspond to the supporting force required to generate the weight of the steel billet 11.

[0037] If the weight of billet 11 is less than the preset weight, billet 11 is a light billet; if the weight of billet 11 is greater than the preset weight, billet 11 is a heavy billet. Different holding oil pressures are set for light and heavy billets to prevent the steel taking arm 410 from sinking during movement.

[0038] In the automatic steel taking process of the steel tapping machine 400, a hydraulic pressure holding method is added, which can lock the correct position of the steel taking arm 410 of the steel tapping machine 400 after it is raised to the correct position. This avoids the steel tapping machine 400 from sliding down due to internal leakage of the oil cylinder during the steel taking process, thereby eliminating the steel dropping accident caused by the friction between the billet 11 and the end wall of the heating furnace 100 due to the sliding down.

[0039] Reference Figure 1 and Figure 2 In this embodiment, step S32, if the weight of the steel billet 11 is greater than the preset weight, then the steel-picking arm 410 is controlled to rise to the preset height, and the lifting oil pressure and the retraction oil pressure are controlled to be at the second preset value, including: Step S321: If the weight of the billet 11 is greater than the preset weight, the steel picking arm 410 rises to the preset height and the hydraulic pressure at the rising position is at the second preset value, then the steel picking arm 410 is controlled to move backward; if the hydraulic pressure at the rising position is less than the second preset value during the backward movement, the steel picking arm 410 is raised to the preset height and the hydraulic pressure at the rising position is controlled to be at the second preset value until the steel picking arm 410 moves backward into place.

[0040] During the raising and lowering of the steel lifting arm 410, the hydraulic pressure needs to be monitored and controlled. If the hydraulic pressure drops, it needs to be increased to maintain the transport of the steel billet 11.

[0041] Reference Figure 1 and Figure 2 In this embodiment, step S32, if the weight of the steel billet 11 is greater than the preset weight, then the steel-picking arm 410 is controlled to rise to the preset height, and the lifting oil pressure and the retraction oil pressure are controlled to be at the second preset value, further includes: In step S322, if the weight of the billet 11 is greater than the preset weight, the hydraulic cylinder stroke of the steel-picking arm 410 is controlled to be at 96%. Specifically, by using the hydraulic cylinder stroke to reach 96%, the heavy billet can be transported without depressurization.

[0042] Reference Figure 1 and Figure 2 In this embodiment, the preset weight is 28 tons. This can be adjusted according to the actual situation. After the weight division is adjusted, the corresponding oil pressure should also be adjusted accordingly.

[0043] Reference Figure 1 and Figure 2 In this embodiment, step S4, based on the weight signal and the amount of steel overflow, controls the billet discharge stroke of the walking beam conveying the billet 11 and the steel taking stroke of the steel taking arm 410 of the steel tapping machine 400, including: Step S41: If the weight of the billet 11 is greater than the preset weight and the overflow of the steel is greater than the preset overflow, control the walking beam to stop. Step S42: If the weight of the billet 11 is greater than the preset weight and the overflow amount is less than the preset overflow amount, then control the walking beam to move the billet 11 for one cycle until the overflow amount is greater than the preset overflow amount. Among them, at least two preset overflow amounts + one cycle stroke < the distance from the furnace head tapping light inspection position 200 to the heating furnace 100 discharge furnace door 110.

[0044] During the process of the walking beam conveying the billet to the furnace door 110, the optical detector 200 detects the presence of steel, but the overflow amount ΔX is less than the preset overflow amount. The walking beam then continues for one cycle. Upon reaching the desired position, the program again checks if the overflow amount is greater than the preset overflow amount, and if the optical detector 200 signal detects the presence of steel, the tapping machine 400 automatically taps the billet. The overflow amount ΔX can be quickly obtained during the process of the walking beam conveying the billet 110.

[0045] During billet operation, increasing the overflow amount will theoretically shorten the steel taking distance, which will reduce the torque on the billet 11 on the steel taking machine 400 arm. By utilizing the lever principle, the load on the steel taking machine 400 during billet taking will be reduced, so as to avoid billet falling, steel taking machine head breaking, etc.

[0046] In this embodiment, the preset overflow amount is 100mm, and the cycle stroke is 550mm or 600mm.

[0047] According to the theoretical steel-taking distance calculation formula, increasing the overflow amount shortens the theoretical steel-taking stroke, thus reducing the torque on the billet 11 on the steel-taking arm 410 of the tapping machine 400. Therefore, during the process of the walking beam conveying the billet 11 to the furnace door 110, if the optical detector 200 detects steel but the overflow amount is less than 100mm, the walking beam continues for one cycle, thereby increasing the overflow amount. Once it exceeds 100mm, the walking beam conveying process terminates. Originally, the overflow amount was reset before each movement of the walking beam. Now, it is required that the optical detector 200 not reset when steel is detected. This is to accumulate overflow amounts less than 100mm by having the walking beam complete one more cycle to obtain a new overflow amount for program judgment.

[0048] Reference Figure 1 and Figure 2 In this embodiment, step S4, controlling the billet discharge stroke of the walking beam conveying the billet 11 and the steel taking stroke of the steel taking arm 410 of the steel tapping machine 400 based on the weight signal and the steel overflow amount, further includes: Step S43: If the weight of the billet 11 is greater than the preset weight, the steel taking stroke of the steel taking arm 410 is controlled according to the steel taking length of the steel taking arm 410 being two-thirds of the length of the steel taking arm 410; wherein, the steel taking length is the length occupied by the steel billet 11 on the steel taking arm.

[0049] The steel-receiving arm 410 moves to two-thirds of the length of the steel billet 11 to receive the billet. If the steel billet 11 overflows a lot, the steel-receiving stroke is reduced, which can reduce the torque of the steel-receiving arm 410 and reduce the risk of the steel-receiving arm 410 dropping the steel.

[0050] In this embodiment, the laser signal judgment at the position of the furnace head steel tapping optical detector 200 is subjected to anti-interference processing and filtering; and a backflushing air source is used at the measurement cavity position.

[0051] To ensure the accuracy of overflow data calculation and prevent interference from erroneous laser signals inside the furnace, anti-interference processing was implemented for the judgment of laser signals inside the furnace. The signals were filtered in the program, and a backflush air source was added at the measurement cavity location on site to eliminate interference on the measurement path.

[0052] In addition, starting from the moment the slab enters the furnace, the cumulative translation value of each step beam is used to track the position of each steel billet 11 in the furnace, obtain the theoretical head distance, and compare it with the actual head distance at the light inspection point 200. If the deviation is within the range, the control program will automatically correct it; if the deviation is outside the range, an alarm will be triggered on the operation screen to prompt the operator to manually correct it, so as to ensure the accuracy of the overflow data.

[0053] An embodiment of the present invention also provides a walking beam furnace billet rebar extraction system 10. The walking beam furnace billet rebar extraction system 10 includes a furnace 100, a tapping machine 400, a pressure holding device, and a controller. The tapping machine 400 is located downstream of the furnace 100, and the pressure holding device is mounted on the tapping machine 400. The pressure holding device is electrically connected to the controller, which controls the rising and retracting oil pressures through the pressure holding device. The controller is used to execute the control method for the walking beam furnace billet rebar extraction.

[0054] The steel is fed out by the walking beam inside the heating furnace 100, and the steel is picked up and delivered by the steel tapping machine 400. The pressure holding device controls the rising oil pressure of the steel picking arm 410 of the steel tapping machine 400, which can improve the problem that the increased weight of the billet in the heating furnace 100 makes it difficult to tap the steel and requires a large investment in equipment upgrades.

[0055] According to the control method for rebar extraction in a walking beam furnace provided in this embodiment, the working principle of the control method for rebar extraction in a walking beam furnace is as follows: Reference Figure 3 The system begins by using optical detector 200 to determine if there is steel in the furnace head, and whether it is a heavy or light billet. If there is steel and it is a heavy billet, the overflow amount is determined. If the overflow amount is greater than 100mm, the steel tapping machine 400 and steel-retrieving arm 410 are controlled to move forward. After the steel-retrieving arm 410 moves into position, it is controlled to rise to its final position. After rising to its final position, the system checks if the oil pressure is greater than the preset oil pressure. If it is, the steel-retrieving arm 410 is controlled to retreat and transport the steel billet 11. If it is less than the preset oil pressure, the oil pressure is adjusted until the oil pressure meets the requirements. During the retreat, if the steel-retrieving arm 410 rises to its final position and the pressure is greater than the preset value, it continues to retreat until it reaches its final position. If it does not reach its final position, it continues to retreat.

[0056] Reference Figure 4 The system determines whether the weight of billet 11 is greater than 28 tons and determines the overflow amount. If the weight is greater than 28 tons and the overflow amount is greater than 100mm, the walking beam ends the cycle, and the steel tapping arm 410 of the tapping machine 400 begins to tap steel. If the overflow amount is less than 100mm, the walking beam goes through another cycle and determines again whether there is a billet at the furnace head and the overflow amount is greater than 100mm. If so, the walking beam ends the cycle, and the steel tapping arm 410 of the tapping machine 400 begins to tap steel. If not, the walking beam goes through another cycle and determines again whether there is a billet at the furnace head and the overflow amount is greater than 100mm, until the overflow amount is greater than 100mm.

[0057] The automatic hydraulic pressure holding control method ensures the lifting height and locks the position. This method avoids the phenomenon of the height dropping due to internal leakage of the oil cylinder during the steel picking process, and eliminates the accident of steel billet falling off the friction end wall of 11.

[0058] The control method for rebar extraction in a walking beam furnace provided in this embodiment has at least the following advantages: The program automatically identifies heavy and light billets, meeting the new requirements of the production process. During the automatic steel-retrieving lifting action of the 400-meter steel tapping machine, an automatic hydraulic pressure-holding program ensures the lifting height and locks the position. This method avoids the phenomenon of height slippage due to internal leakage in the cylinder during steel retrieval under existing control modes, thus preventing steel billet falling off the friction end wall at step 11.

[0059] When receiving a heavy billet, the extension of the steel tapping arm is reduced appropriately under safe conditions, and the torque of the billet 11 on the steel tapping machine 400 is reduced accordingly, thereby reducing the load on the transverse motor and lifting hydraulic cylinder of the steel tapping machine 400.

[0060] By utilizing in-furnace data tracking, the in-furnace laser detection signal was optimized to ensure the accuracy of overflow data.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the removal of steel from heavy billets in a walking beam furnace, characterized in that, include: Obtain the weight signal of the steel billet on the walking beam; Obtain the overflow amount of steel billet from the walking beam; Based on the weight signal, the rising position, rising position hydraulic pressure, and retraction hydraulic pressure of the steel-taking arm of the steel-exiting machine are controlled; Based on the weight signal and the steel overflow amount, the billet discharge stroke of the walking beam and the steel taking stroke of the steel taking arm of the steel tapping machine are controlled. The walking beam is installed inside the heating furnace and is used to transport steel billets. The tapping machine is located downstream of the heating furnace and is used to receive the steel billets on the walking beam and transport them downstream. The overflow amount is the distance the walking beam transports the steel billet from the furnace head tapping inspection position to the pre-stop position. The billet travel distance is the distance the walking beam transports the steel billet from the furnace head tapping inspection position to the actual stop position. The billet taking travel distance is the distance the taking arm travels from its initial position to the billet receiving position. The billet taking travel distance is less than the distance from the furnace head tapping inspection position to the heating furnace discharge door. The steps of controlling the billet discharge stroke of the walking beam conveying the billet and the steel taking stroke of the steel taking arm of the steel tapping machine based on the weight signal and the steel overflow amount include: If the weight of the billet is greater than the preset weight, and the amount of steel overflow is greater than the preset overflow amount, the walking beam is controlled to stop. If the weight of the billet is greater than the preset weight and the overflow amount is less than the preset overflow amount, then the walking beam is controlled to move the billet for one cycle until the overflow amount is greater than the preset overflow amount. Wherein, at least two of the preset overflow amounts + one cycle stroke are less than the distance from the tapping light inspection position of the furnace head to the charging furnace door; If the weight of the steel billet is greater than the preset weight, the steel taking stroke of the steel taking arm is controlled according to the steel taking length being two-thirds of the steel taking arm length; wherein, the steel taking length is the length occupied by the steel billet on the steel taking arm.

2. The control method for rebar extraction in a walking beam furnace according to claim 1, characterized in that, The step of controlling the rising position, rising position hydraulic pressure, and retraction hydraulic pressure of the steel tapping arm based on the weight signal includes: If the weight of the steel billet is less than the preset weight, the steel taking arm is controlled to rise to the preset height, and the lifting oil pressure and the retraction oil pressure are controlled to be at the first preset value. If the weight of the steel billet is greater than the preset weight, the steel taking arm is controlled to rise to the preset height, and the lifting oil pressure and the retraction oil pressure are controlled to be at the second preset value. Wherein, the first preset value is less than the second preset value, and the first preset value and the second preset value respectively correspond to the supporting force required to generate the weight of the steel billet.

3. The control method for rebar extraction in a walking beam furnace according to claim 2, characterized in that, The step of controlling the steel billet arm to rise to a preset height and controlling the lifting and retraction hydraulic pressures to a second preset value if the weight of the steel billet is greater than a preset weight includes: If the weight of the steel billet is greater than the preset weight, the steel taking arm rises to the preset height, and the hydraulic pressure at the rising position is at the second preset value, then the steel taking arm is controlled to retract; if the hydraulic pressure at the rising position is less than the second preset value during the retraction process, the steel taking arm is raised to the preset height and the hydraulic pressure at the rising position is controlled to be at the second preset value, until the steel taking arm retracts to the correct position.

4. The control method for rebar extraction in a walking beam furnace according to claim 2, characterized in that, The step of controlling the steel billet arm to rise to a preset height and controlling the lifting and retraction hydraulic pressures to be at a second preset value if the weight of the steel billet is greater than a preset weight further includes: If the weight of the steel billet is greater than the preset weight, the cylinder stroke of the steel-picking arm is controlled to be at 96%.

5. The control method for rebar extraction in a walking beam furnace according to any one of claims 2-4, characterized in that, The preset weight is 28 tons.

6. The control method for rebar extraction in a walking beam furnace according to claim 1, characterized in that, The preset overflow amount is 100mm, and the cycle stroke is 550mm or 600mm.

7. The control method for rebar extraction in a walking beam furnace according to any one of claims 1-4, characterized in that, The laser signal from the light inspection at the tapping position of the furnace head is subjected to anti-interference processing and filtering; a backflushing air source is used at the measurement cavity position.

8. A system for rebar extraction from a walking beam furnace, characterized in that, The walking beam furnace billet extraction system includes a furnace, a tapping machine, a pressure holding device, and a controller. The tapping machine is located downstream of the furnace, and the pressure holding device is located on the tapping machine. The pressure holding device is electrically connected to the controller. The controller controls the rising oil pressure and the retracting oil pressure through the pressure holding device. The controller is used to execute the control method for billet extraction in a walking beam furnace according to any one of claims 1-7.

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