A high-speed wire rod discharge roller way billet operation monitoring method

Abstract

This invention discloses a method for monitoring the operation of billets on a high-speed wire rod furnace exit roller conveyor. Based on a high-speed wire rod furnace exit roller conveyor billet operation monitoring system, the monitoring method includes: S1, taking the moment when the hot metal detector A detects the billet as the starting point; then: the standard time T2 for hot metal detector A to detect the billet is 0; the standard time T1 for hot metal detector B to detect the front end of the billet is (l4-l3) / v; the standard time T3 for the tail end of the billet to pass through hot metal detector B is (l4+l2-l3) / v; S2, starting the exit roller conveyor, and acquiring the real-time time t1 for hot metal detector B to detect the billet, the real-time time t2 for hot metal detector A to detect the tail end of the billet passing through, and the real-time time t3 for the tail end of the billet to pass through hot metal detector B during operation; if t1 > T1+2s, t2 > T2+2s, or t2 > T3+2s, then the billet is determined to be abnormally running on the exit roller conveyor. This solves the problem of existing technologies failing to detect abnormal billet operation on the exit roller conveyor in a timely manner, which easily leads to roughing-rolled scrap.

Description

[Technical Field]

[0001] This invention belongs to the field of billet roller conveyor monitoring technology, specifically relating to a method for monitoring the operation of billets on high-speed wire rod furnace exit roller conveyors. [Background Technology]

[0002] In the steelmaking process, an outlet roller conveyor is installed between the heating furnace and the first stand of the rolling mill. This conveyor includes a high-pressure water descaling system to remove the iron oxide scale generated during the heating of the steel billet in the heating furnace. The time the billet spends on the outlet roller conveyor after exiting the furnace determines its temperature when it enters the first stand of the rolling mill. Current technology cannot accurately determine the time the billet spends on the outlet roller conveyor, making it impossible to detect abnormalities in time or stop the conveyor in a timely manner. Due to the presence of the high-pressure water treatment system, if the billet's movement is abnormal, its position on the outlet roller conveyor may cause uncontrollable abnormal cooling, resulting in roughing mill scrap and severely impacting normal production on the rolling mill. [Summary of the Invention]

[0003] The purpose of this invention is to provide a method for monitoring the operation of steel billets on the high-speed wire rod furnace exit roller conveyor, so as to solve the problem that the existing technology cannot detect abnormal operation of steel billets on the furnace exit roller conveyor in a timely manner, which easily leads to the occurrence of rough rolling scrap.

[0004] This invention adopts the following technical solution: a method for monitoring the operation of billets on a high-speed wire rod furnace roller conveyor, based on a high-speed wire rod furnace roller conveyor billet operation monitoring system, comprising:

[0005] A furnace exit roller conveyor is connected between the billet heating furnace 1 and the first stand of the rolling mill. A hot metal detector A is installed on the furnace exit roller conveyor near the billet heating furnace, and a hot metal detector B is installed on the furnace exit roller conveyor away from the billet heating furnace.

[0006] Operational monitoring methods include:

[0007] S1. Let the moment when the billet is detected by the hot metal detector A after it exits the furnace be taken as the starting point; then:

[0008] The standard time for hot metal detector A to detect the steel billet is: T2 = 0;

[0009] The standard time for hot metal detector B to detect the front end of the billet is: T1 = (l4 - l3) / v;

[0010] The standard time for the tail end of the steel billet to pass through the hot metal detector B is: T3 = (l4 + l2 - l3) / v;

[0011] Among them, the total length of the furnace exit roller is l1, the total length of the billet is l2, the billet linear velocity is v, the distance between hot metal detector A and the billet heating furnace is l3, and the distance between hot metal detector B and the billet heating furnace is l4.

[0012] S2. Start the furnace exit roller conveyor, the billet exits the furnace and runs towards the first stand of the rolling mill on the furnace exit roller conveyor; during operation, the real-time time t1 when the hot metal detector B detects the billet, the real-time time t2 when the hot metal detector A detects the end of the billet passing through, and the real-time time t3 when the end of the billet passes through the hot metal detector B are obtained respectively.

[0013] If t1 > T1+2s, t2 > T2+2s, or t2 > T3+2s, then the billet is determined to be running abnormally on the furnace discharge roller conveyor, and the furnace discharge roller conveyor is controlled to stop.

[0014] Furthermore, hot metal detector A is installed 0.5m away from the furnace door of the heating furnace, the distance between hot metal detector B and the first stand of the rolling mill is less than the total length of the billet, and the distance between hot metal detector B and hot metal detector A is l5, then l2-l5=100~500mm.

[0015] The beneficial effects of this invention are: by monitoring the process of the billet passing through the furnace exit roller conveyor, this invention can promptly detect any abnormalities that may occur during this process and control the furnace exit roller conveyor to stop automatically in a timely manner, thereby preventing rough rolling scrap caused by such reasons, improving the rolling line operation rate, and reminding the rolling line control console to confirm and handle the situation after the shutdown; by monitoring the time it takes for the billet to pass through the furnace exit roller conveyor, the billet temperature can be determined to ensure the normal operation of the equipment. [Attached Image Description]

[0016] Figure 1 This is a schematic diagram of a high-speed wire rod furnace billet operation monitoring system according to the present invention;

[0017] Figure 2 This is a flowchart of a high-speed wire rod furnace billet operation monitoring method according to the present invention.

[0018] Among them, 1. billet heating furnace, 2. furnace exit roller conveyor, 3. hot metal detector A, 4. hot metal detector B, 5. billet, 6. first stand of rolling mill, 7. high-pressure water descaling system.

Detailed Implementation Methods

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] This invention provides a method for monitoring the operation of billets on high-speed wire rod furnace roller conveyors, such as... Figure 1 As shown, a billet operation monitoring system based on a high-speed wire rod furnace exit roller conveyor includes:

[0021] A furnace exit roller conveyor 2 is connected between the billet heating furnace 1 and the first stand of the rolling mill 6. A hot metal detector A3 is installed on the furnace exit roller conveyor 2 near the billet heating furnace 1, and a hot metal detector B4 is installed on the furnace exit roller conveyor 2 away from the billet heating furnace 1. A high-pressure water descaling system 7 is installed above the furnace exit roller conveyor 2 and between the hot metal detector A3 and the hot metal detector B4.

[0022] Operational monitoring methods include:

[0023] S1. Let the moment when billet 5 is detected by hot metal detector A3 after it exits the furnace be taken as the starting point; then:

[0024] The standard time for hot metal detector A3 to detect steel billet 5 is: T2 = 0;

[0025] The standard time for hot metal detector B4 to detect the front end of billet 5 is: T1 = l4 - l3 / v;

[0026] The standard time for the tail end of billet 5 to pass through hot metal detector B4: T3 = l4 + l2 - l3 / v;

[0027] Among them, the length of the furnace exit roller 2 is l1, the total length of the billet 5 is l2, the linear velocity of the billet 5 is v, the distance between the hot metal detector A3 and the billet heating furnace 1 is l3, and the distance between the hot metal detector B4 and the billet heating furnace 1 is l4.

[0028] S2. Start the furnace exit roller conveyor 2, the steel billet 5 exits the furnace and runs through the furnace exit roller conveyor 2 towards the first stand of the rolling mill 6; during operation, the following data are obtained:

[0029] The hot metal detector B4 detects the front end of the billet 5 at real time t1, the hot metal detector A3 detects the tail end of the billet 5 at real time t2, and the tail end of the billet 5 at real time t3.

[0030] If t1 > T1+2s, t2 > T2+2s, or t2 > T3+2s, then the billet 5 is determined to be running abnormally on the furnace exit roller conveyor 2, and the furnace exit roller conveyor 2 is stopped.

[0031] If t1≤T1+2s, t2≤T2+2s, or t2≤T3+2s, then the billet 5 is determined to be operating normally on the furnace exit roller conveyor 2.

[0032] This invention discloses a method for monitoring the operation of steel billets on a high-speed wire rod furnace exit roller conveyor. It can automatically read the roller conveyor speed and, combined with information such as the roller conveyor length and the relative position of the hot metal detector, automatically calculate the time taken for the steel billet 5 to pass through each stage of the exit roller conveyor 2, specifically the aforementioned real-time times t1, t2, and t3. The operating status of the exit roller conveyor 2 is determined by analyzing the time taken for the steel billet 5 to reach each stage.

[0033] Specifically, after the billet exits the furnace, the hot metal detector A3 detects billet 5.

[0034] a: The internal heating metal detector B3 did not detect steel billet 5 within the specified time t1;

[0035] b: The tail end of billet 5 failed to pass the hot metal detector A3 within the specified time t2;

[0036] c: The tail end of billet 5 failed to pass the hot metal detector B4 within the specified time t3;

[0037] The above three situations indicate abnormal operation of the billet on the furnace exit roller conveyor. The roller conveyor will be stopped, and forward rotation will be prohibited. Simultaneously, an alarm will be triggered on the main control panel of the rolling line, prompting personnel to confirm the situation on-site to prevent abnormal cooling of the billet from causing production stoppages or equipment damage. Once on-site personnel confirm that the billet can continue rolling, they can restore normal operation of the furnace exit roller conveyor by pressing the "Reset Hot Steel Exit Timeout" button on the main control panel.

[0038] In some embodiments, the hot metal detector A3 is installed 0.5m away from the furnace door of the heating furnace 1, the distance between the hot metal detector B4 and the first stand of the rolling mill 6 is less than the total length of the billet 5, and the distance between the hot metal detector B4 and the hot metal detector A3 is l2-l5 = 100-500mm.

[0039] To accurately detect the billet's exit position and prevent interference from the high-temperature billet 5 inside the furnace on the output signal of the hot metal detector A3, the hot metal detector A is installed 0.5m from the furnace door. To ensure the hot metal detector B4 can continuously detect the billet 5 signal until it properly enters the first stand of the rolling mill 6, the distance between the hot metal detector B4 and the first stand of the rolling mill 6 should be less than the total length of the billet 5. Simultaneously, the distance between the hot metal detector B4 and the hot metal detector A3 should be slightly less than the length of the billet 5. This is to allow both detectors to simultaneously detect the position of the billet 5, facilitating more accurate detection of its running status on the exit roller conveyor 2.

[0040] Example

[0041] The high-pressure water descaling system 7 is located on the furnace exit roller conveyor 2, about 3 meters from the outlet of the billet heating furnace 1. Two hot metal detectors are installed at 0.5 meters from the outlet of the heating furnace and at 10.3 meters from the outlet. The automated program calculates the time for the billet 5 to pass normally through the furnace exit roller conveyor 2, and the time for it to pass through the hot metal detectors A3 and B4, based on different linear velocities. By judging the time, the system monitors the billet 5 in three different stages of its operation on the furnace exit roller conveyor 2.

[0042] The total length of the discharge roller conveyor is l1 = 19.7 meters, the total length of the billet is l2 = 10.5 meters, the billet linear velocity is v = 1.5 m / s, the distance between hot metal detector A and the billet heating furnace is l3 = 0.5 meters, and the distance between hot metal detector B and the billet heating furnace is l4 = 10.3 meters. Metal detector A is installed 0.5 meters from the furnace door, and the designed distance between hot metal detectors A and B is 10.3 meters. The high-pressure water descaling system is 3 meters away from billet heating furnace 1. Therefore:

[0043] The standard time for the hot metal detector A3 to detect the front end of billet 5 is: T2 = 0;

[0044] The standard time for the hot metal detector B4 to detect the front end of billet 5 is: T1 = l4 - l3 / v = 6.53s;

[0045] The standard time for the tail end of billet 5 to pass through the hot metal detector B4 is: T3 = l4 + l2 - l3 / v = 13.5s;

[0046] After obtaining the above standard times, the operation of billet 5 is divided into three stages:

[0047] The first stage: Starting from the moment when the hot metal detector A3 detects the billet 5 after it exits the furnace, the front end of the billet must reach the high-pressure water descaling system 7 after about 2 seconds, and reach the hot metal detector B4 within 8.53 seconds.

[0048] Second stage: Within 8.6 seconds after the hot metal detector A3 detects the billet 5, the billet 5 must completely pass through the high-pressure water descaling system 7;

[0049] Third stage: Within 13.3 seconds after hot metal detector A3 detects billet 5, billet 5 must be bitten into the first stand of the rolling mill 6 within 15.5 seconds.

[0050] In actual operation, the above three stages need to be monitored. If the billet is not detected within the time limit of any of the three stages, it is determined that the billet is running abnormally on the exit roller conveyor. The roller conveyor is immediately stopped and forward rotation is prohibited. At the same time, an alarm is triggered on the main control panel screen of the rolling line to remind personnel to confirm on-site and prevent abnormal cooling of the billet from causing production stoppage or equipment damage. When on-site personnel confirm that the billet can continue rolling, they can restore the normal operation of the exit roller conveyor by pressing the "Reset Hot Steel Exit Timeout" button set on the main control panel screen.

[0051] This invention monitors the process of steel billets passing through the furnace exit roller conveyor, promptly detects any abnormalities that may occur during this process, and controls the automatic shutdown of the exit roller conveyor to prevent rough rolling scrap caused by such reasons, thereby improving the rolling line's operating rate. After the shutdown, the rolling line control console is alerted to confirm and handle the situation. By monitoring the time it takes for the steel billets to pass through the furnace exit roller conveyor, the billet temperature is determined, ensuring the normal operation of the equipment.

Claims

1. A method for monitoring the operation of billet on a high-speed wire rod furnace roller conveyor, characterized in that, A billet operation monitoring system based on a high-speed wire rod tapping roller conveyor includes: A furnace exit roller conveyor (2) is provided between the billet heating furnace (1) and the first stand of the rolling mill (6). A hot metal detector A (3) is provided on the furnace exit roller conveyor (2) near the billet heating furnace (1), and a hot metal detector B (4) is provided on the furnace exit roller conveyor (2) away from the billet heating furnace (1). The operation monitoring method includes: S1. Let the moment when the steel billet (5) is detected by the hot metal detector A (3) after it exits the furnace be taken as the starting point; then: The standard time for the hot metal detector A (3) to detect the steel billet (5) is: T2=0; The hot metal detector B (4) detects the standard time at which the front end of the billet (5) is reached: ; The standard time for the tail end of the steel billet (5) to pass through the hot metal detector B (4): ; The total length of the furnace exit roller conveyor (2) is... The steel billet (5) has a total length of The linear velocity of the billet (5) is v, and the distance between the hot metal detector A (3) and the billet heating furnace (1) is... The distance between the hot metal detector B (4) and the billet heating furnace (1) is... ; S2. Start the furnace exit roller conveyor (2), the billet (5) exits the furnace and runs through the furnace exit roller conveyor (2) to the first stand of the rolling mill (6); during operation, the real-time time t1 when the hot metal detector B (4) detects the billet (5), the real-time time t2 when the tail end of the billet (5) passes through the hot metal detector A (3), and the real-time time t3 when the tail end of the billet (5) passes through the hot metal detector B (4) are respectively acquired; If t1 > T1+2s, t2 > T2+2s or t2 > T3+2s, then the billet (5) is determined to be running abnormally on the furnace exit roller conveyor (2), and the furnace exit roller conveyor (2) is controlled to stop.

2. The method for monitoring the operation of billet on a high-speed wire rod furnace roller conveyor as described in claim 1, characterized in that, The hot metal detector A (3) is installed 0.5m from the furnace door of the billet heating furnace (1). The distance between the hot metal detector B (4) and the first stand of the rolling mill (6) is less than the total length of the billet (5). The distance between the hot metal detector B (4) and the hot metal detector A (3) is... ,but .

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