Method for controlling tail acceleration to avoid steel piling

Abstract

The application discloses a method for controlling tail acceleration to avoid steel piling, and relates to the technical field of steel rolling production equipment, and solves the technical problem that the existing rear area collection only makes tail roller acceleration control mode and is prone to steel piling. The method comprises the following steps: step one, real-time detection of air cooling roller speed signal; step two, setting of a first timing time and a second timing time, when the finishing rolling unit bites into red steel and the air cooling roller speed signal is detected, the first rotation speed timing is triggered, the first timing time starts timing, and the motor rotation speed of the air cooling roller is increased to a first rotation speed value; and step three, after the first timing time timing ends, the second rotation speed timing is triggered, the second timing time starts timing, and the motor rotation speed of the air cooling roller is increased to a second rotation speed value. The application avoids the working condition of steel piling, guarantees product quality improvement, and guarantees product yield.

Description

Technical Field

[0001] This invention relates to the field of steel rolling production equipment technology, and more specifically, to a method for controlling tail acceleration to avoid steel piling up. Background Technology

[0002] Currently, the high-speed wire rod rolling process includes a rolling zone and a post-rolling collection zone. The finished coils, after being cooled by twelve air-cooled rollers, enter the finishing collection area. The existing problem is that the preceding finished coil does not receive adequate roller acceleration control, resulting in it being pressed down by the following coil, which can easily lead to steel piling. The post-collection operation screen and control system only controls the acceleration of the tail roller, which cannot meet the overall production and collection rhythm, thus negatively impacting production and product quality. These deficiencies in the existing technology are closely related to the lack of effective network communication between the entire rolling control system and the post-collection control system, as well as design flaws in the post-collection process. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a method for controlling tail acceleration to avoid steel piling, thereby solving the technical problem that steel piling is prone to occur in the existing rear-zone collection method that only controls the tail roller acceleration.

[0004] The present invention discloses a method for controlling tail acceleration to avoid steel accumulation. The method is as follows:

[0005] Step 1: Real-time detection of the air-cooled roller conveyor speed signal;

[0006] Step 2: Set the first timing time and the second timing time. When the finishing mill bites into the red steel and detects the speed signal of the air-cooled roller conveyor, the first speed timing is triggered. The first timing time starts counting down, which will increase the motor speed of the air-cooled roller conveyor to the first speed value.

[0007] Step 3: When the first timer expires, the second speed timer is triggered, and the second timer starts counting down, increasing the motor speed of the air-cooled roller conveyor to the second speed value;

[0008] Step 4: When the air-cooled roller conveyor is detected to be in crawling mode, stop increasing the motor speed of the air-cooled roller conveyor rollers.

[0009] As a further improvement, the first speed value is the rated speed of the motor.

[0010] Furthermore, the second speed value is 70%-90% of the motor's rated speed.

[0011] Furthermore, the first and second timing times can be set by checking the "Accelerate Air-Cooled Roller" selection box and using the "Time Setting" dialog box in the operation screen.

[0012] Furthermore, when coiled wire gets stuck in the collection area or the receiving coil core bar cannot be aligned with the nose cone, the motor speed of the air-cooled roller conveyor is reduced to put the air-cooled roller conveyor into crawling mode.

[0013] Furthermore, a time control function block FC20 is established, which stores the first timing time and the second timing time.

[0014] Beneficial effects

[0015] The advantages of this invention are:

[0016] This invention uses a first and a second timer to detect the speed signal of the air-cooled roller conveyor in real time. The first and second timers are triggered based on the hot steel biting into the finishing mill and the speed signal of the air-cooled roller conveyor. The motor speed of the air-cooled roller conveyor is then controlled during the first and second timers, thereby avoiding steel piling up, ensuring improved product quality, and guaranteeing the yield of the product. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall process of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0019] See Figure 1 The present invention discloses a method for controlling tail acceleration to avoid steel piling. The method includes the following steps: Step 1: Establishing a communication connection between the PLC of the rear collection area of ​​the production line and the PLC of the rolling line from both hardware and software perspectives.

[0020] In the entire high-speed wire rod production process, the coils formed after the wire rods are rolled out are transported to the finishing and collection area via two separate lines. Because the wire rod control system and the collection control system are far apart, a long-distance hard wire is required to establish a stable communication network. However, long-distance network communication can easily lead to signal attenuation or instability. To achieve long-term stable production in both areas, a stable communication network needs to be established for precise communication. From a hardware perspective, Siemens signal modules, such as digital input (DI) and digital output (DO) modules, need to be installed in the PLC control cabinets of the electrical control rooms in both areas to enable bilateral communication. From a software perspective, input / output control blocks for corresponding control points in the PLC software control program need to be established for both areas, corresponding to the input / output points controlled by the corresponding signals to achieve bilateral communication.

[0021] Digital Input Module (DI): Its function is to convert input digital signals into digital signals that the PLC can recognize, for PLC status monitoring. A DI typically has multiple input channels, each capable of receiving a digital signal, such as the level output of a sensor or the on / off state of a proximity switch. Internal circuitry converts these digital signals into digital signals before outputting them to the PLC.

[0022] Step 2: Select the corresponding communication signal points between the rolling zone and the rear collection zone to establish input and output signal communication.

[0023] Based on step one, a communication connection was established between the PLC of the rear collection area and the PLC of the rolling line, both in terms of hardware and software. To control the tail-end acceleration function and increase the distance between the front and rear coils to avoid steel accumulation, a signal interlock control point in the rolling zone control system that can control the coil acceleration at the tail of the air-cooled roller conveyor in the rear collection area was selected. Based on the established hardware and software, the input and output signal flow was completed, and the corresponding communication points between the rolling zone and the rear collection area were determined. After extensive on-site investigation and real-time debugging, the signal of the high-speed finishing mill biting into the red-hot steel was selected as the corresponding communication point to control the acceleration function at the tail of the air-cooled roller conveyor in the rear collection area.

[0024] Communication connection between the collection area PLC and the rolling line PLC: During normal rolling, the data exchange process between the control signals of the collection area PLC and the control signals of the rolling line PLC is realized through input-to-output and output-to-input signal processes to achieve the communication connection between the collection area PLC and the rolling line PLC.

[0025] Step 3: Control of the acceleration function at the tail of the air-cooled roller conveyor in the collection area after the silk is coiled.

[0026] According to the rolling process and the production requirements of different rolling specifications, the operation of the air-cooled roller conveyor in the collection area mainly relies on AC motor drive. The synchronous operation of the AC motor is controlled by frequency converter. In order to save power consumption costs and achieve optimal control, it is necessary to manually select the acceleration process of the coil tail of the air-cooled roller conveyor in the collection area after coiling under different rolling specifications. When the air-cooled roller conveyor in the collection area needs to be accelerated during fast rolling, the roller conveyor acceleration dialog box after the finishing mill bites the steel signal is selected on the PLC process operation screen. If the finishing mill bites the red steel, the air-cooled roller conveyor speed signal point needs to be triggered immediately to control the frequency converter to accelerate the motor speed.

[0027] When acceleration control of the air-cooled roller conveyor in the collection area is not required during slow rolling, the selection dialog box for roller conveyor acceleration control after the finishing mill bites the steel signal in the rolling zone is canceled on the process operation screen. Then, the speed signal point of the air-cooled roller conveyor will not be triggered after the finishing mill bites the red steel to control the frequency converter to accelerate the motor speed. This completes the control of the acceleration function of the air-cooled roller conveyor at the end of the coiling after the wire is coiled.

[0028] Variable frequency drive (VFD) control: can reduce the impact on the power grid, avoid excessive peak-to-valley differences in motors, achieve controllable acceleration function, and thus smoothly accelerate according to user needs. The equipment stopping method is also controllable, making the entire equipment and system safer and increasing the equipment's lifespan accordingly.

[0029] Step 4: The timing of the acceleration of the air-cooled roller conveyor in the rear collection zone is controlled by the steel-bearing signal generated by the finishing mill in the rolling zone.

[0030] Based on the implementation function of step three above, and according to the production process and rolling production requirements, in order to increase the distance between the beginning and end of the coil before and after wire drawing and avoid steel pile-up accidents, it is necessary to reasonably control the acceleration timing of the air-cooled roller conveyor motor speed control. This acceleration timing can be manually adjusted by the operator according to the rolling production rhythm. First, a time control function block FC20 is programmed in the air-cooled roller conveyor control system program. When the finishing mill in the rolling zone bites the red steel, it generates a signal pulse to the time control function block FC20. The operator inputs the first timing time t1 in advance on the process operation screen according to the on-site rolling rhythm. After the red steel is drawn into a coil by the wire drawing machine and sent to the air-cooled roller conveyor, the roller conveyor acceleration performance is activated. Based on this, the operator inputs the second timing time t2 on the process operation screen according to the on-site rolling rhythm. The time difference between the second timing time t2 and the first timing time t1 is the time interval between the steel signal generated by the finishing mill in the rolling zone and the acceleration of the air-cooled roller conveyor in the rear collection area.

[0031] Time control function block FC20: Its function is to perform signal trigger delay through this time block, so as to achieve precise logic control of subsequent signals.

[0032] Step 5: Variable frequency speed control of the air-cooled roller conveyor in the rear collection area.

[0033] Based on the implementation function of step four above, an intermediate variable point for selecting the acceleration of the air-cooled roller conveyor is established in the speed control program. This variable point is flexibly selected by the process operator according to the rolling rhythm and different rolling specifications. The frequency conversion speed control of the air-cooled roller conveyor in the rear collection area is realized by triggering this intermediate variable point. When the process operator selects this intermediate variable point according to the process production requirements, the first speed timing is triggered. When the second speed timing is triggered, the motor speed of the air-cooled roller conveyor is output at 100% of the rated speed value at full load through the frequency converter. When the second speed timing is triggered, the motor speed of the air-cooled roller conveyor is output at 80% of the rated speed value through the frequency converter. When the process operator does not need to select this intermediate variable point according to the process production requirements, it means that the air-cooled roller conveyor in the rear collection area does not need to meet the frequency conversion acceleration control. In this case, the motor speed of the air-cooled roller conveyor is only output at 80% of the rated speed value through the frequency converter. Through the aforementioned flexible frequency conversion control of the air-cooled roller conveyor, the frequency conversion speed control of the motor of the air-cooled roller conveyor in the rear collection area can be optimized, and the operation of the electrical equipment can be improved to meet the on-site process production requirements and rolling rhythm. By controlling the frequency conversion speed and time of the air-cooled roller conveyor in the rear collection area, the distance between the coils before and after the wire drawing is increased to avoid steel piling.

[0034] Rated speed: This is the motor speed at its rated power, and also indicates the maximum speed of the motor.

[0035] Step Six: Add a selection box for the air-cooled roller conveyor process screen and set the screen time.

[0036] Based on the above steps, an acceleration selection checkbox and a time setting dialog box are created in the WINCC human-machine interface. First, within the variable management menu of the WINCC interface, the first and second time setting points, the steel signal point of the finishing mill in the rolling zone, the acceleration time setting value at the tail of the coil, the non-acceleration selection checkbox for the coil tail of the wire drawing machine, and the motor speed feedback display value of the air-cooled rollers are established. This facilitates process personnel's control over the quality of the finished coils and optimizes the production process.

[0037] WINCC Human-Machine Interface: A widely used human-machine interface software for automation control and monitoring, industrial data communication and acquisition. Its rich functions and various components meet the needs of a wide range of industrial technology fields. Through real-time communication with logic programming control software (PLC), it feeds back relevant signal points to the industrial control computer screen via Ethernet communication links, thereby prompting process operators to track and monitor production status and various aspects of rolling data in real time.

[0038] Step 7: Cancel the acceleration function for coiled tail steel during the creeping operation of the air-cooled roller conveyor.

[0039] Based on the above steps, if the coil gets stuck on the wire or the receiving coil core bar cannot be aligned with the nose cone during the coil collection process in the subsequent steps of the air-cooled roller conveyor in the rear collection area, the process operator needs to switch the air-cooled roller conveyor into crawling mode to allow sufficient time to handle the coil receiving fault in the coil collection area. If the air-cooled roller conveyor is still in full acceleration mode or the tail steel coil is in accelerated running mode, there is a risk of coil collision or coil stacking.

[0040] Entering crawling mode on air-cooled roller conveyors: When there is a blockage or other signal or mechanical fault in the electrical or mechanical transmission of a section of the air-cooled roller conveyor, the motor speed of the air-cooled roller conveyor is reduced to control the air-cooled roller conveyor to enter crawling mode. When there is an electrical or mechanical fluid fault in the coil receiving tray, coil mandrel, or coil transport trolley in the subsequent production process of the air-cooled roller conveyor, the roller conveyor crawling mode can also be achieved by synchronously reducing the speed of the air-cooled roller conveyor motor.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for controlling tail acceleration to avoid steel piling, characterized in that, The method is as follows: Step 1: Real-time detection of the air-cooled roller conveyor speed signal; Step 2: Set the first timing time and the second timing time. When the finishing mill bites into the red steel and detects the speed signal of the air-cooled roller conveyor, the first speed timing is triggered. The first timing time starts counting down, which will increase the motor speed of the air-cooled roller conveyor to the first speed value. Step 3: When the first timing period ends, the second speed timing is triggered, and the second timing period begins, reducing the motor speed of the air-cooled roller conveyor to the second speed value; Step 4: When the air-cooled roller conveyor is detected to be in crawling mode, stop increasing the motor speed of the air-cooled roller conveyor rollers; The first speed value is the rated speed of the motor; The second speed value is 70%-90% of the motor's rated speed; The first and second timing times can be set by checking the air-cooled roller conveyor acceleration selection box and using the time setting dialog box in the operation screen. When coiled wire gets stuck in the collection area or the receiving coil core bar cannot be aligned with the nose cone, the motor speed of the air-cooled roller conveyor is reduced to put the air-cooled roller conveyor into crawling mode.

2. The method for controlling tail acceleration to avoid steel accumulation according to claim 1, characterized in that, A time control function block FC20 is established, which stores the first timing time and the second timing time.

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