Method for controlling tail acceleration to avoid steel stacking

Abstract

The invention discloses a method for controlling tail acceleration to avoid steel heaping, relates to the technical field of steel rolling production equipment, and solves the technical problem that steel heaping is easy to occur due to the fact that only tail roller way acceleration control is carried out in existing rear area collection. The method comprises the following steps: step 1, detecting a speed signal of the air-cooled roller way in real time; step 2, first timing time and second timing time are set, when a finishing mill group grips red steel and detects a speed signal of the air-cooled roller way, first rotating speed timing is triggered, timing is started at the first timing time, and the rotating speed of a motor of a roller of the air-cooled roller way is increased to a first rotating speed value; and 3, after timing of the first timing time is finished, second rotating speed timing is triggered, timing is started at the second timing time, and the rotating speed of the motor of the air cooling roller way roller is increased to a second rotating speed value. The working condition of steel stacking is avoided, the product quality is improved, and the product yield is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling production equipment, and more specifically, to a method for controlling tail acceleration to avoid steel piling. Background Art

[0002] At present, the operation area of ​​high-wire rolling production includes the rolling area and the collection area after wire laying. After wire laying, the finished coil is cooled by twelve sections of air-cooled rollers and then enters the finishing collection. The existing problem is that the previous finished wire coil cannot obtain reasonable roller acceleration operation control, so it is pressed by the next coil, which easily leads to steel piling. The operation screen and control system of the rear area collection only have the tail roller acceleration control, which cannot meet the entire production rhythm and collection rhythm, which will have an adverse effect on production and product quality. The above-mentioned defects and shortcomings of the prior art are closely related to the fact that the entire rolling control system and the rear area collection control system have not been well connected to the network communication. At the same time, there are also defects in the process operation design of the rear area collection. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for controlling tail acceleration to avoid steel piling in view of the deficiencies in the prior art, thereby solving the technical problem that steel piling is prone to occur in the prior art where only tail roller acceleration control is performed in the rear zone collection.

[0004] The method for controlling tail acceleration to avoid steel piling according to the present invention comprises:

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

[0006] Step 2: Setting a first timing time and a second timing time, when the finishing mill bites into the red steel and detects the air-cooled roller speed signal, triggering the first speed timing, the first timing time starts, and the motor speed of the air-cooled roller is increased to the first speed value;

[0007] Step 3: When the first timing time ends, the second speed timing is triggered, the second timing time starts, and the motor speed of the air-cooled roller is increased to the second speed value;

[0008] Step 4: When it is detected that the air-cooled roller is in the creeping mode, stop increasing the motor speed of the rollers of the air-cooled roller.

[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 rated speed of the motor.

[0011] Furthermore, the first timing time and the second timing time are set by selecting the check box of the air-cooled roller acceleration in the operation screen and the time setting dialog box.

[0012] Furthermore, when the coil hangs on the collection area or the coil receiving mandrel cannot be centered on the nose cone, the motor speed of the air-cooled roller is reduced to put the air-cooled roller into a creeping mode.

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

[0014] Beneficial Effects

[0015] The advantages of the present invention are:

[0016] The present invention detects the air-cooled roller speed signal in real time by setting the first timing time and the second timing time, triggers the first timing time and the second timing time according to the biting of red steel by the finishing mill and the air-cooled roller speed signal, and operates the motor speed of the air-cooled roller at the first timing time and the second timing time, thereby avoiding the working condition of steel piling, ensuring the improvement of product quality, and guaranteeing the product yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall process of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0019] See also Figure 1 The present invention provides a method for controlling tail acceleration to avoid steel piling, the method comprising: 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 the hardware and software aspects.

[0020] During the entire double-high wire production process, the coils formed after the wire rolling is spun are divided into line one and line two and transmitted to the back area for finishing and collection. Since the wire rolling control system is far away from the back area collection control system, if a stable communication network is required, a long-distance hard line is required. Long-distance network communication is likely to cause signal attenuation or signal instability. In order to achieve the long-term stable production requirements of the two areas, a stable communication network needs to be established to achieve precise communication. Starting from the hardware aspect, Siemens signal modules need to be installed in the PLC control cabinets of the electrical control rooms of the two areas, such as the digital input module DI module and the digital output module DO module, so that bilateral communication between the two areas can be achieved; starting from the software aspect, in the control program of the PLC software, the input and output control blocks of the corresponding control points of the two areas are established, corresponding to the input and output points of the corresponding signal control to achieve bilateral communication.

[0021] Digital input module DI: Its function is to convert the input digital signal into a digital signal recognizable by the PLC for PLC status monitoring. The digital input module DI usually has multiple input channels, each of which can receive a digital signal, such as the level of the sensor output, the switch state of the proximity switch, etc. These digital signals are converted into digital signals through internal circuits and then output to the PLC.

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

[0023] According to step one, establish the communication connection between the PLC of the rear collection area of ​​the production line and the PLC of the rolling line from the hardware and software aspects. In order to realize the control of the tail acceleration function to increase the distance between the front and rear coils to avoid steel piling, select the signal interlocking control point in the rolling area control system that can control the acceleration of the coils at the tail of the air-cooled roller in the rear collection area, complete the process of input and output signals on the basis of the established hardware and software, and determine the corresponding communication points between the rolling area and the rear collection area. After long-term on-site investigation and real-time debugging, select the signal of the finishing mill in the high-speed area of ​​the rolling area biting into the red steel as the corresponding communication point to control the acceleration function of the tail of the air-cooled roller in the rear collection area.

[0024] Communication connection between the collection area PLC and the rolling line PLC: During the normal rolling process, the data exchange process between the collection area PLC control signal and the rolling line PLC control signal is realized, and the process of input to output and output to input signal is carried out to realize the communication connection between the collection area PLC and the rolling line PLC.

[0025] Step 3: Control the acceleration function of the wind-cooled roller coil tail in the collection area after the spinning coil.

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

[0027] When in the slow rolling process, there is no need for acceleration control of the air-cooled roller in the collection area, then cancel the selection of the roller acceleration control selection dialog box after the steel biting signal of the finishing mill in the rolling area on the process operation screen. Then, after the finishing mill bites into the red steel, the air-cooled roller speed signal point will not be triggered to control the frequency converter to accelerate the motor speed, thereby completing the acceleration function of the tail of the air-cooled roller coil in the collection area after the spinning coil.

[0028] Inverter frequency control: It can reduce the impact on the power grid and will not cause the problem of excessive peak-to-valley difference on the motor. It can realize controllable acceleration function, so as to perform smooth acceleration according to user needs. The equipment stopping mode is controllable, which can make the entire equipment and system safer and increase the life of the equipment accordingly.

[0029] Step 4: The finishing mill in the rolling area generates a steel signal to control the time of accelerating the air-cooled roller in the rear collection area.

[0030] According to the implementation function of the above step three, according to the production process and rolling production requirements, in order to increase the distance between the head and tail of the coil before and after the wire laying to avoid steel piling accidents, it is necessary to reasonably control the acceleration timing of the air-cooled roller motor speed control, and at the same time, this acceleration timing can be manually adjusted by the operator according to the rolling production rhythm. First, the time control function block FC20 is compiled in the air-cooled roller control system program. When the finishing mill in the rolling area bites into the red steel, a signal pulse is generated to the time control function block FC20. The operator enters the first timing time t1 on the process operation screen in advance according to the on-site rolling rhythm. When the red steel is spun into a coil by the wire laying machine to the air-cooled roller, the roller acceleration performance is turned on. On this basis, the operator enters the second timing time t2 on the process operation screen according to the on-site rolling rhythm. The time difference obtained by the second timing time t2-the first timing time t1 is the time interval for the finishing mill in the rolling area to generate a steel signal to accelerate the air-cooled roller in the rear collection area.

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

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

[0033] According to the implementation function of the above step 4, an intermediate variable point for selecting the acceleration of the air-cooled roller is established in the air-cooled roller speed control program. This variable point is flexibly selected by the process operator according to the rolling rhythm and different rolling specifications. The variable speed control of the air-cooled roller in the rear collection area is realized by triggering this intermediate variable point. When the process personnel select 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 outputs 100% of the rated speed value of the motor at full load through frequency conversion; when the second speed timing is triggered, the motor speed of the air-cooled roller outputs 80% of the rated speed value through frequency conversion; when the process personnel do not need to select this intermediate variable point according to the process production requirements, it means that the air-cooled roller in the rear collection area does not need to meet the variable speed acceleration control. At this time, the motor speed of the air-cooled roller only outputs 80% of the rated speed value through frequency conversion. Through the above flexible speed frequency control of the air-cooled roller, the variable speed control of the motor of the air-cooled roller in the rear collection area can be optimized, and the operation of the improved electrical equipment can meet the on-site process production requirements and rolling rhythm. The distance between the coils before and after the wire laying is widened by the variable speed control and time control of the air-cooled roller in the rear collection area to avoid steel piling.

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

[0035] Step 6: Add the check box selection operation and screen time setting for the air cooling roller process screen

[0036] According to the above steps, the air-cooled roller acceleration selection check box and time setting dialog box are established in the WINCC screen of the human-machine interface. First, the first and second timing time setting points, the steel signal point of the finishing mill in the rolling area, the acceleration time setting value of the tail of the coil, the non-acceleration selection check box of the tail roller of the laying machine, and the motor speed feedback display value of the air-cooled roller are established in the variable management menu bar of the WINCC screen of the human-machine interface. It promotes the control of the quality of the finished coil by the process personnel and optimizes the process production process.

[0037] Human-machine interface WINCC: Human-machine interface software widely used in automation control and monitoring, industrial data communication and collection. Its rich functions and various components meet the needs of the vast industrial technology field. Through real-time communication with the logic programming control software PLC, the relevant signal points are fed back to the industrial control computer screen in the form of Ethernet communication link, so as to prompt the process operator to track and monitor the production status and various rolling data in real time.

[0038] Step 7: When the air-cooled roller is in the creeping state, cancel the coil tail steel acceleration function

[0039] According to the above steps, when the coils are hung on the wire or the receiving coil mandrel cannot be aligned with the nose cone during the coil collection process in the subsequent process of the air-cooled roller conveyor in the rear collection area, the process operator needs to switch the air-cooled roller conveyor to the crawling mode, so as to leave appropriate time to deal with the failure of the receiving coils in the coil collection area. If the air-cooled roller conveyor is still in the full acceleration state or the tail steel coil is in the accelerated operation state, there will be a risk of coil tailing or coil stacking.

[0040] The air-cooled roller conveyor enters the creeping mode: when there is a jam or other signal or mechanical failure in the electrical or mechanical transmission of a certain 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 the creeping mode. When there is an electrical or mechanical fluid failure in the coil receiving tray, coil collecting mandrel or coil transport trolley in the subsequent production process of the air-cooled roller conveyor process, the roller conveyor creeping mode can also be achieved by synchronously reducing the speed of the air-cooled roller conveyor motor.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for controlling tail acceleration to avoid steel piling, characterized in that: The method is, Step 1: Real-time detection of air-cooled roller speed signal; Step 2: Setting a first timing time and a second timing time, when the finishing mill bites into the red steel and detects the air-cooled roller speed signal, triggering the first speed timing, the first timing time starts, and the motor speed of the air-cooled roller is increased to the first speed value; Step 3: When the first timing time ends, the second speed timing is triggered, the second timing time starts, and the motor speed of the air-cooled roller is increased to the second speed value; Step 4: When it is detected that the air-cooled roller is in the creeping mode, stop increasing the motor speed of the rollers of the air-cooled roller.

2. A method for controlling tail acceleration to avoid steel piling according to claim 1, characterized in that: The first speed value is the rated speed of the motor.

3. The method for controlling tail acceleration to avoid steel pile-up according to claim 1, characterized in that: The second speed value is 70%-90% of the rated speed of the motor.

4. The method for controlling tail acceleration to avoid steel pile-up according to claim 1, characterized in that: Set the first timing time and the second timing time by selecting the check box for air-cooled roller acceleration in the operation screen and the time setting dialog box.

5. The method for controlling tail acceleration to avoid steel pile-up according to claim 1, characterized in that: When the coil hangs on the collection area or the coil receiving mandrel cannot be aligned with the nose cone, the motor speed of the air-cooled roller is reduced to put the air-cooled roller into the creeping mode.

6. The method for controlling tail acceleration to avoid steel pile-up according to claim 1, characterized in that: A time control function block FC20 is established, and the time control function block FC20 stores the first timing time and the second timing time.

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