A double signal automatic switching rolling piece tracking trigger signal control method

Abstract

The application discloses a double-signal automatic switching rolling piece tracking trigger signal control method and belongs to the technical field of rolling steel. The method solves the technical problem that the existing state only has the steel signal in the signal transmission and is interfered by external interference, which leads to signal loss or multiple signals, and directly leads to the position tracking exception of the rolling piece. The method is as follows: when the hot detection signal is abnormal in the rough rolling area, the position tracking of the rolling piece is activated directly according to the torque through logical judgment, instead of the original hot detection activation signal; in the finishing rolling area, a new hot detection is installed at the entrance of the area to form a double signal with the original hot detection to realize real-time position signal acquisition, data processing and logical judgment, so that the tracking signal abnormality caused by the unstable signal flashing or the damage of the original hot detection is completely eliminated.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and more specifically, to a dual-signal automatic switching control method for workpiece tracking trigger signals. Background Technology

[0002] For rolling line processes, the position tracking of the rolled piece is of utmost importance. Once an abnormal tracking signal occurs, it will directly lead to regional steel accumulation or steel accumulation throughout the entire rolling line. The processing time for regional steel accumulation or steel accumulation throughout the entire line is very long, which has a significant impact on production. Regional steel accumulation or steel accumulation throughout the entire line will cause great damage to various mechanical equipment, electrical equipment, and process equipment, and the processing time is long.

[0003] Currently, the two-bar rolling line has 18 mills divided into 3 areas: roughing, intermediate rolling, and finishing rolling. Mills 1-6 are the roughing area, mills 7-12 are the intermediate rolling area, and mills 13-18 are the finishing area. The tracking of rolled pieces in each area must be triggered by the hot inspection signal installed in front of the first mill in each area. After the signal is activated, the program tracks the steel signal by distance and speed. When the steel signal reaches the current stand, the corresponding stand torque threshold value reaches the set value, and the steel signal of the mill is activated in sequence.

[0004] In the current state, if the hot inspection steel signal is lost or over-interfered during signal transmission due to external interference, it will directly lead to abnormal position tracking of the rolled piece, resulting in an accident. This will have a great impact on the safe and stable operation of the equipment and the continuous and stable production. Therefore, the existing control method is seriously mismatched with the on-site production rhythm.

[0005] The shortcomings of existing technology include:

[0006] 1. When the hot inspection signal before roughing is abnormal, it will cause abnormal position tracking of the rolled piece in the roughing area, chaotic roughing tension adjustment, and abnormal shearing of No. 1 flying shear, which may lead to steel loss on site.

[0007] 2. When the pre-rolling hot inspection signal is abnormal, it causes abnormal position tracking of the rolled piece in the intermediate rolling area, chaotic tension adjustment in the intermediate rolling, abnormal shearing of the No. 2 flying shear, and steel piling up in the area.

[0008] 3. Abnormal hot inspection signal before finishing rolling leads to abnormal position tracking of rolled pieces in the finishing rolling area, chaotic finishing rolling tension adjustment, abnormal finishing rolling looper start-up signal, and steel piling up on site.

[0009] 4. Due to the above reasons, regional steel stockpiling or steel-containing areas along the entire production line can cause significant damage to various mechanical, electrical, and process equipment, resulting in lengthy processing times. This will have a substantial impact on the safe and stable operation of equipment and the continuous and stable production. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a dual-signal automatic switching rolling mill tracking trigger signal control method, which can completely eliminate the abnormal tracking signal caused by signal flickering instability or damage to the thermal detector itself.

[0011] The technical solution of this invention is: a dual-signal automatic switching control method for workpiece tracking trigger signals. In the roughing and intermediate rolling zones, when the hot inspection signal is abnormal, the position tracking of the workpiece is activated directly based on the torque judgment through logical judgment, replacing the original hot inspection activation signal. In the finishing rolling zone, a new hot inspection is installed at the zone entrance to form a dual signal with the original hot inspection, thereby realizing real-time position signal acquisition, data processing, and logical judgment, so as to completely eliminate the situation where the tracking signal is abnormal due to signal flickering instability or damage to the original hot inspection itself.

[0012] As a further improvement, the following steps are included:

[0013] Step 1. Add a software trigger point in the roughing and intermediate rolling zone. By setting the torque threshold value of the stand, compare the stand torque with the set torque threshold value. Through data comparison, adjust the set value to determine the most suitable set value.

[0014] Step 2. Selection of new hot inspection model for finishing mill: Select a hot inspection model that can effectively detect the real-time position of the billet;

[0015] Step 3. Determining the location and installing the new hot inspection device in the finishing mill: Through on-site measurement, observation, and data comparison, the installation location of the new hot inspection device is finally determined. The new hot inspection device is named the "Finishing Mill Entry New Hot Inspection Device". While meeting the measurement distance requirements, it should be kept as far away from high-temperature areas as possible. The new hot inspection device body is protected against impact and dust. A bracket is made to fix the new hot inspection device horizontally on the bracket, so that the direction of the new hot inspection laser is aligned with the center of the billet. A protective cover is installed on the new hot inspection device body for dustproof, waterproof, and impact protection. At the same time, an extension bracket and protective cover are installed in front of the new hot inspection device to prevent external signal interference. The new hot inspection device is positioned through real-time on-site observation.

[0016] Step 4. Connect the new hot inspection PNP signal of the finishing mill to the PLC control system. The new hot inspection signal has PNP and relay digital output signals. Compared with the relay output signal, the PNP output signal is more stable and faster. Therefore, the PNP output signal is used for the new hot inspection. Connect the signal to the heating furnace remote station and obtain the real-time signal through the PLC system and the remote station.

[0017] Step 5. Track the feedback signal of the new hot inspection of the finishing mill. Track the new hot inspection signal at the entry of the finishing mill through high-speed data acquisition software. Adjust the angle and sensitivity of the new hot inspection laser direction by comparing the data.

[0018] Step 6. System logic writing, there are 3 logical cases in total;

[0019] The first logical scenario is as follows: When steel is tapped from the heating furnace, after the No. 2 hot detector on the tapping roller conveyor receives a signal, the distance from the No. 2 hot detector to the roughing mill inlet hot detector is divided by the linear velocity of the tapping roller conveyor. When the calculated distance to the roughing mill inlet hot detector is reached, and a delay is set, if the original hot detector does not receive a signal, the program considers the inlet hot detector signal to be abnormally triggered and directly switches to the torque trigger mode. When the torque of the roughing mill inlet stand reaches the set value, the head tracking of the roughing mill workpiece is activated.

[0020] The second logical scenario is as follows: After the head tracking signal of the last stand in the roughing mill area is activated, the distance from the last stand in the roughing mill area to the entrance stand in the intermediate mill area is divided by the linear velocity of the last stand in the roughing mill area. When the distance to the intermediate mill entrance hot inspection is calculated, and a delay is set, if there is no signal from the original hot inspection, the program considers the entrance hot inspection signal to be abnormal and directly switches to the torque trigger mode. When the torque of the intermediate mill entrance stand reaches the set value, the head tracking of the intermediate mill workpiece is activated.

[0021] The third logical case is as follows: After the head tracking signal of the last stand in the intermediate rolling zone is activated, the distance from the last stand in the intermediate rolling zone to the entrance stand in the finishing rolling zone is divided by the linear velocity of the last stand in the intermediate rolling zone. When the original hot inspection distance to the entrance of the finishing rolling zone is calculated, if there is no signal from the original hot inspection but a signal from the new hot inspection at the entrance of the finishing rolling zone, the program considers the original hot inspection signal at the entrance of the finishing rolling zone to be abnormal and directly adopts the new hot inspection at the entrance of the finishing rolling zone. When the torque of the entrance stand of the finishing rolling zone reaches the set value, the head tracking of the finishing rolling piece is activated.

[0022] Step 7. System program simulation and debugging: All the written logic output points are downloaded to the PLC in sections using intermediate points. High-speed data acquisition software is used for monitoring and analysis. Through big data comparison, the hot inspection delay time of the roughing rolling area is adjusted, and the hot inspection delay time of the intermediate rolling area is adjusted.

[0023] Step 8. System program merging: Integrate the simulated and debugged program into the original system program to form a dual-signal triggering rolling mill steel signal control;

[0024] Step 9. Operation screen programming: Based on logical judgment control, control the rolling mill's steel signal by dual-signal triggering. Add the option to select the rolling mill's steel signal by region in the operation screen.

[0025] Furthermore, in step one, the final set value is determined to be 14%.

[0026] Furthermore, in step two, based on the on-site process conditions, the following parameters are selected: detection temperature: 200~1400℃, temperature measurement accuracy: ±3℃, detection distance: 1~6m, output signal: PNP, relay, to meet the on-site requirements for thermal testing.

[0027] Furthermore, in step three, it was finally determined that the new heat detector would be installed 10 cm away from the original heat detector at the inlet of the finishing mill.

[0028] Furthermore, in step seven, the hot inspection delay time in the roughing rolling area is set to 200 milliseconds, and the hot inspection delay time in the intermediate rolling area is set to 100 milliseconds.

[0029] Beneficial effects

[0030] Compared with the prior art, the advantages of this invention are as follows:

[0031] This invention activates workpiece position tracking via logical judgment and direct torque determination when the heat detection signal is abnormal in the roughing rolling zone, replacing the original heat detection activation signal. In the intermediate rolling zone, the same logic-based activation of the heat detection signal is used to activate workpiece position tracking via torque determination when the heat detection signal is abnormal. In the finishing rolling zone, an additional heat detection signal is added to the existing signal set to collect workpiece position data. By simultaneously collecting signals from both hardware channels, workpiece position tracking is activated. This completely eliminates tracking signal abnormalities caused by signal flickering or instability, or damage to the heat detector itself, significantly reducing steel accumulation and ensuring safe and stable equipment operation and continuous, stable production. Attached Figure Description

[0032] Figure 1 This is a flowchart of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure for installing the new thermal detector in this invention.

[0034] Among them: 1-intermediate rolling mill stand, 2-finishing mill inlet stand, 3-original hot inspection, 4-new hot inspection, 5-rolled steel parts. Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0036] See Figures 1-2 This paper presents a dual-signal automatic switching method for rolling mill tracking trigger signal control. Innovations are primarily achieved through three aspects: dual-signal acquisition, data processing, and logical judgment. The dual signals trigger rolling mill position tracking via logical judgment. In the roughing and intermediate rolling zones, when the hot inspection signal is abnormal, logical judgment directly activates rolling mill position tracking based on torque, replacing the original hot inspection activation signal. In the finishing rolling zone, a new hot inspection sensor is installed at the zone entrance to form a dual-signal system with the original sensor, enabling real-time position signal acquisition, data processing, and logical judgment. This completely eliminates tracking signal abnormalities caused by signal flickering instability or damage to the original hot inspection sensor itself.

[0037] Specifically, it includes the following steps one through nine:

[0038] Step 1. Add a software trigger point in the roughing and intermediate rolling mill areas. By setting a torque threshold value for the stand, compare the stand torque with the set torque threshold value. Through data comparison, adjust the set value to determine the most suitable setting value. The final set value is determined to be 13% to 15%, with 14% being preferred.

[0039] Step 2. Selection of a new hot metal detector for finishing mills: Choose a hot metal detector that can effectively detect the real-time position of the billet. Based on the on-site process conditions, select a detection temperature of 200–1400℃, a temperature accuracy of ±3℃, a detection distance of 1–6m, and output signals of PNP and relay to meet the on-site requirements for hot metal detection. In this embodiment, the hot metal detector refers to a hot metal detector used to identify the leading edge and direction of hot metal movement.

[0040] Step 3. Determining the location and installing the new hot inspection device in the finishing mill. Through on-site measurement, observation, and data comparison, the installation location of the new hot inspection device was finally determined. The new hot inspection device was named the "Finishing Mill Inlet New Hot Inspection Device." While meeting measurement distance requirements, it was designed to be as far away from high-temperature areas as possible. The new hot inspection device was protected against impact and dust. A bracket was fabricated to horizontally mount the new hot inspection device, ensuring the laser direction was aligned with the center of the billet. A protective cover was installed on the new hot inspection device for dust, water, and impact protection. An extension bracket and protective cover were also installed in front of the new hot inspection device to prevent external signal interference. The new hot inspection device was positioned through real-time on-site observation. Ultimately, it was determined that the new hot inspection device would be installed 10cm away from the original hot inspection device at the finishing mill inlet. Figure 2 As shown, the original hot inspection unit 3 and the new hot inspection unit 4 are installed between the intermediate rolling mill stand 1 and the finishing mill entrance stand 2. The original hot inspection unit 3 and the new hot inspection unit 4 simultaneously inspect the rolled steel parts 5.

[0041] Step 4. Connect the new hot inspection PNP signal of the finishing mill to the PLC control system. The new hot inspection signal has PNP and relay digital output signals. Compared with the relay output signal, the PNP output signal is more stable and faster. Therefore, the PNP output signal is used for the new hot inspection. Connect the signal to the heating furnace remote station and obtain the real-time signal through communication between the PLC system and the remote station.

[0042] Preferably, the PNP or relay digital output signal is: when the hot detector detects the billet signal, it sends 24V to the remote station module.

[0043] Step 5. Track the feedback signal of the new hot inspection of the finishing mill. Track the new hot inspection signal at the entry of the finishing mill through high-speed data acquisition software. Adjust the angle and sensitivity of the new hot inspection laser direction by comparing the data.

[0044] Adjusting sensitivity: There is a small metal knob on the back of the thermal detector. Adjusting it clockwise increases the sensitivity and makes it easier to detect signals, while adjusting it counterclockwise decreases the sensitivity.

[0045] High-speed data acquisition software: It can collect changes in variables within the PLC, with a minimum scan cycle of 10ms, facilitating the analysis of historical data.

[0046] Step 6. System logic writing, there are 3 logical scenarios in total;

[0047] The first logical scenario is as follows: When steel is tapped from the heating furnace, after the No. 2 hot detector on the tapping roller conveyor receives a signal, the distance from the No. 2 hot detector to the roughing mill inlet hot detector is divided by the linear velocity of the tapping roller conveyor. When the calculated distance to the roughing mill inlet hot detector is reached, and a delay is set, if the original hot detector does not receive a signal, the program considers the inlet hot detector signal to be abnormally triggered and directly switches to the torque trigger mode. When the torque of the roughing mill inlet stand reaches the set value, the head tracking of the roughing mill workpiece is activated.

[0048] The second logical scenario is as follows: After the head tracking signal of the last stand in the roughing mill area is activated, the distance from the last stand in the roughing mill area to the entrance stand in the intermediate mill area is divided by the linear velocity of the last stand in the roughing mill area. When the distance to the intermediate mill entrance hot inspection is calculated, and a delay is set, if there is no signal from the original hot inspection, the program considers the entrance hot inspection signal to be abnormal and directly switches to the torque trigger mode. When the torque of the intermediate mill entrance stand reaches the set value, the head tracking of the intermediate mill workpiece is activated.

[0049] The third logical scenario is as follows: After the head tracking signal of the last stand in the intermediate rolling zone is activated, the distance from the last stand in the intermediate rolling zone to the entrance stand in the finishing rolling zone is divided by the linear velocity of the last stand in the intermediate rolling zone. When the original hot inspection distance to the entrance of the finishing rolling zone is calculated, if there is no signal from the original hot inspection but a signal from the new hot inspection at the entrance of the finishing rolling zone, the program considers the original hot inspection signal at the entrance of the finishing rolling zone to be abnormal and directly adopts the new hot inspection at the entrance of the finishing rolling zone. When the torque of the entrance stand of the finishing rolling zone reaches the set value, the head tracking of the finishing rolling piece is activated.

[0050] Step 7. System program simulation and debugging: All the written logic output points are downloaded to the PLC in sections using intermediate points. High-speed data acquisition software is used for monitoring and analysis. Through big data comparison, the hot inspection delay time of the roughing rolling area is adjusted and finally set to 200 milliseconds. The hot inspection delay time of the intermediate rolling area is also adjusted and finally set to 100 milliseconds.

[0051] Step 8. System Program Merging. Through the above seven steps, the core functions of the control system have been completed, including position installation, signal acquisition, and position data processing. The simulated and debugged program is integrated into the original system program to form a dual-signal triggered rolling mill steelmaking signal control.

[0052] Step 9. Operation screen programming: Based on logical judgment control, control the rolling mill's steel signal by dual-signal triggering. Add the option to select the rolling mill's steel signal control by area in the operation screen. The function can be manually canceled by area through the screen.

[0053] The above are merely preferred embodiments 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 a workpiece tracking trigger signal with dual-signal automatic switching, characterized in that, Specifically, the following steps are included: Step 1. Add a software trigger point in the roughing and intermediate rolling zone. By setting the torque threshold value of the stand, compare the stand torque with the set torque threshold value. Adjust the set value through data comparison and determine the set value to be 14%. Step 2. Selection of new hot inspection model for finishing mill; Step 3. Determining the location and installing the new hot inspection device in the finishing mill: Through on-site measurement, observation, and data comparison, the installation location of the new hot inspection device is finally determined. The new hot inspection device is named the "Finishing Mill Entry New Hot Inspection Device". While meeting the measurement distance requirements, it should be kept as far away from high-temperature areas as possible. The new hot inspection device body is protected against impact and dust. A bracket is made to fix the new hot inspection device horizontally on the bracket, so that the direction of the new hot inspection laser is aligned with the center of the billet. A protective cover is installed on the new hot inspection device body for dustproof, waterproof, and impact protection. At the same time, an extension bracket and protective cover are installed in front of the new hot inspection device to prevent external signal interference. The new hot inspection device is positioned through real-time on-site observation. Step 4. Connect the PNP signal from the new hot inspection of the finishing mill to the PLC control system; Step 5. Track the feedback signal from the new hot inspection of the finishing mill; Step 6. System logic writing, there are 3 logical cases in total; The first logical scenario is as follows: When steel is tapped from the heating furnace, after the No. 2 hot detector on the tapping roller conveyor receives a signal, the distance from the No. 2 hot detector to the roughing mill inlet hot detector is divided by the linear velocity of the tapping roller conveyor. When the calculated distance to the roughing mill inlet hot detector is reached, and a delay is set, if the original hot detector does not receive a signal, the program considers the inlet hot detector signal to be abnormally triggered and directly switches to the torque trigger mode. When the torque of the roughing mill inlet stand reaches the set value, the head tracking of the roughing mill workpiece is activated. The second logical scenario is as follows: After the head tracking signal of the last stand in the roughing mill area is activated, the distance from the last stand in the roughing mill area to the entrance stand in the intermediate mill area is divided by the linear velocity of the last stand in the roughing mill area. When the distance to the intermediate mill entrance hot inspection is calculated, and a delay is set, if there is no signal from the original hot inspection, the program considers the entrance hot inspection signal to be abnormal and directly switches to the torque trigger mode. When the torque of the intermediate mill entrance stand reaches the set value, the head tracking of the intermediate mill workpiece is activated. The third logical case is as follows: After the head tracking signal of the last stand in the intermediate rolling zone is activated, the distance from the last stand in the intermediate rolling zone to the entrance stand in the finishing rolling zone is divided by the linear velocity of the last stand in the intermediate rolling zone. When the original hot inspection distance to the entrance of the finishing rolling zone is calculated, if there is no signal from the original hot inspection but a signal from the new hot inspection at the entrance of the finishing rolling zone, the program considers the original hot inspection signal at the entrance of the finishing rolling zone to be abnormal and directly adopts the new hot inspection at the entrance of the finishing rolling zone. When the torque of the entrance stand of the finishing rolling zone reaches the set value, the head tracking of the finishing rolling piece is activated. Step 7. System program simulation and debugging: All the written logic output points are downloaded to the PLC in parts using intermediate points. High-speed data acquisition software is used for monitoring and analysis. Through big data comparison, the hot inspection delay time of the roughing and intermediate rolling areas is adjusted. The hot inspection delay time of the roughing rolling area is set to 200 milliseconds, and the hot inspection delay time of the intermediate rolling area is set to 100 milliseconds. Step 8. Merge system programs; Step 9. Programming the operation screen.

2. The dual-signal automatic switching rolled piece tracking trigger signal control method according to claim 1, characterized in that, In step two, based on the on-site process conditions, the following parameters are selected: detection temperature: 200~1400℃, temperature measurement accuracy: ±3℃, detection distance: 1~6m, output signal: PNP, relay, to meet the on-site requirements for thermal testing.

3. The dual-signal automatic switching rolled piece tracking trigger signal control method according to claim 1, characterized in that, In step three, it was finally determined that the new heat detector would be installed 10 cm away from the original heat detector at the inlet of the finishing mill.

4. The dual-signal automatic switching rolled piece tracking trigger signal control method according to claim 1, characterized in that, Step four specifically includes the following: the new heat detector uses a PNP output signal, which is connected to the remote station of the heating furnace, and the real-time signal is obtained through communication between the PLC system and the remote station.

5. The dual-signal automatic switching rolled piece tracking trigger signal control method according to claim 1, characterized in that, Step five specifically includes tracking the new hot inspection signal at the entry point of the finishing mill using high-speed data acquisition software, and adjusting the angle and sensitivity of the new hot inspection laser direction through data comparison.

6. The dual-signal automatic switching rolling mill tracking trigger signal control method according to claim 1, characterized in that, Step eight specifically includes integrating the simulated and debugged program into the original system program to form a dual-signal triggering control of the rolling mill's steel signal.

7. The dual-signal automatic switching rolling mill tracking trigger signal control method according to claim 1, characterized in that, Step nine specifically includes controlling the rolling mill's steel signal based on logical judgment and dual-signal triggering, and adding the option to select the rolling mill's steel signal by region on the operation screen.

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