Bar line 14-meter steel billet head and tail rolling and speed reduction early warning method

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a bar line 14-meter steel billet head and tail rolling and speed reduction early warning method. Comprising the following steps: (1) preparation work: installing three hot metal detectors B1, B2 and B2'on a rolling line, and electrically connecting the three hot metal detectors B1, B2 and B2 'with an operation table; a speed reduction selection dialog box is added on an HMI operation interface, speed reduction starting delay time, speed reduction duration and speed reduction proportion are set, and speed reduction parameters of the 14-meter rolling 1 # rolling mill are set; and 2 # rolling mill load early warning is added on an HMI operation interface. By means of the control method, the rolling rhythm is improved by 2 s, 48 minutes are saved every day, the daily yield of one bar line is calculated according to 4000 tons, the daily yield is improved by 130 tons, the profit of each ton of steel is calculated according to 300 yuan, the profit of one line is increased by 12870 thousand yuan per year, and other production lines can be copied and popularized through the control method.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for top-to-tail rolling of a 14-meter steel billet on a bar line and a speed reduction warning method thereof. Background Art

[0002] On the high-speed bar production line of the automatic full-continuous rolling production line in the metallurgical field, the steel billet is heated by the heating furnace, and then sent to the main rolling mill for rolling through the operation of the heating furnace walking beam, the cantilever roller and the discharge roller in the discharge furnace. According to the signal generated when the steel billet bites into the rolling mill, through the heating furnace PLC automatic control system, using the heating furnace discharge hot metal detector H2, the action starts from the inside of the heating furnace. When the previous billet is rotated from the heating furnace through the discharge cantilever roller and transported out of the furnace door, the hot metal detector at the furnace door will detect that the billet has completely left the furnace. At this time, the walking beam automatically circulates positively and parks the billet on the discharge cantilever roller, waiting for the signal command to allow the billet to be fed.

[0003] The heating furnace operator controls the steel-out rhythm according to the steel-out cycle set on the Wincc screen. The rolled steel billet is affected by factors such as the mechanical properties of the steel billet itself, the billet temperature, the friction coefficient of the furnace roller, the weight and length of the steel billet, the change in friction when biting into the rolling mill, and the abnormal rhythm of the rolling line equipment itself. As a result, the residence time of the steel billet on the roller fluctuates greatly, resulting in an unstable steel-out rhythm. The steel-out interval has been fluctuating between 3.8 seconds and 7.4 seconds. The steel billets will be rejected, which can cause steel-pile production accidents and equipment damage accidents on the rolling line in severe cases, affecting the shift output.

[0004] In summary, the prior art has the following problems:

[0005] 1. The rolling rhythm is unstable and the cumulative error is large, requiring the heating furnace operator to frequently intervene in the steel-making cycle of the Wincc screen.

[0006] 2. Two billets enter the No. 1 rolling mill head to tail, and the No. 2 rolling mill has a load signal all the time, causing abnormal rolling line tracking.

[0007] 3. The rolling line operator failed to promptly discover and handle abnormal conditions of the rolling mill equipment, resulting in steel piling up on the rolling line. Summary of the invention

[0008] The object of the present invention is to provide a method for top-to-tail rolling of a 14-meter steel billet in a bar line and a speed reduction warning method thereof, so as to solve the problems existing in the prior art.

[0009] The technical solution adopted by the present invention to solve its technical problem is:

[0010] A method for rolling a 14-meter steel billet from top to bottom on a bar line and its speed reduction warning, comprising the following steps:

[0011] (1) Preparation: Install three hot metal detectors B1, B2 and B2' on the rolling line and connect them electrically to the operating table;

[0012] Add a speed reduction selection dialog box on the HMI operation interface to set the speed reduction start delay time, speed reduction duration, and speed reduction ratio to achieve the speed reduction parameter setting of the 14-meter rolling mill No. 1;

[0013] Added 2# rolling mill load early warning alarm on the HMI operation interface;

[0014] (2) Speed ​​reduction: Manually select the head-to-tail mode and start the 1# and 2# rolling mills. When the B2 and B2' signals disappear and the falling edge signal is triggered for 1 second, the 1# rolling mill speed reduction preparation command is automatically started;

[0015] In head-to-tail mode, with both 1# and 2# rolling mills running, when 2# rolling mill is loaded and B2 and B2' have no signals, the speed reduction command of 1# rolling mill is automatically started;

[0016] (3) Reset of the speed reduction preparation command: After the simulated rolling is completed and the speed reduction preparation command is started for 9 seconds, and when the No. 2 rolling mill is unloaded, the speed reduction preparation command is reset;

[0017] (4) Reset of the speed reduction command: The speed reduction command is reset after the speed reduction action reaches the speed reduction duration.

[0018] Furthermore, the hot metal detector B2 and the hot metal detector B2' are located on the rolling line 14.2 meters away from the center line of the rolling mill, and the hot metal detector B2 and the hot metal detector B2' are installed on the same side to detect the same position of the steel billet.

[0019] Furthermore, the hot metal detector B1 is installed on the rolling line between the metal detector B2 and the heating furnace, and is close to the metal detector B2.

[0020] Furthermore, the method for load early warning alarm of the 2# rolling mill in step (1) is: manually set the alarm value, record the load time of the 2# rolling mill during normal rolling, when the load time of the 2# rolling mill exceeds the alarm value, the screen flashes and the buzzer on the operating table sounds an alarm, prompting the operator to roll the billet head and tail, and the 1# rolling mill has not slowed down, and it is necessary to immediately start the 1# flying shear or the 2# flying shear to manually cut the billet head and break it.

[0021] Furthermore, the speed reduction command is reset in step (4). When the No. 1 and No. 2 rolling mills are not running, the furnace rollers are delayed for 3 seconds after reversing, or the furnace rollers are stopped suddenly, the speed reduction command is not executed and the operation mode is automatically switched to manual mode.

[0022] The present invention has the following beneficial effects:

[0023] 1. Through the present invention, the rolling rhythm is increased by 2 seconds, 48 ​​minutes are saved every day, the daily output of a bar line is calculated as 4,000 tons, the daily output is increased by 130 tons, the profit per ton of steel is calculated as 300 yuan, and the profit of one line is increased by 12.87 million yuan a year, and this control method can be copied and promoted to other production lines.

[0024] After the early warning function of the 2# rolling mill is put into use, the operator can use the alarm to promptly discover that the 1# rolling mill has not slowed down, and manually start the 1# flying shear or 2# flying shear to break and shear the problematic steel billet, thus avoiding scrap steel accidents and ensuring stable and smooth production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the installation position of the hot metal detector of the present invention.

[0026] Figure 2 It is a schematic diagram of the speed reduction selection dialog box of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] like Figure 1-2 As shown, a method for rolling a 14-meter steel billet head-to-tail and a speed reduction warning thereof on a bar line comprises the following steps:

[0029] (1) Preparation: Install three hot metal detectors B1, B2 and B2' on the rolling line and connect them electrically to the operating table; Hot metal detectors B2 and B2' are located on the rolling line 14.2 meters away from the center line of the rolling mill, and hot metal detectors B2 and B2' are installed on the same side to detect the same position of the billet. Hot metal detector B1 is installed on the rolling line between metal detector B2 and the heating furnace, and is close to metal detector B2.

[0030] A speed reduction selection dialog box is added to the HMI operation interface, and the speed reduction start delay time is set to 1 second, the speed reduction duration is 5.4 seconds, and the speed reduction ratio is 0.3, so as to realize the speed reduction parameter setting of the 14-meter rolling No. 1 rolling mill.

[0031] Add 2# rolling mill load early warning alarm on the HMI operation interface. The method of 2# rolling mill load early warning alarm is: manually set the alarm value to 48 seconds, record the load time of 2# rolling mill during normal rolling, when the load time of 2# rolling mill exceeds the alarm value, the screen flashes and the buzzer on the operating table sounds an alarm, prompting the operator to roll the billet head and tail, 1# rolling mill has not slowed down, and it is necessary to immediately start 1# flying shear or 2# flying shear to manually cut the billet head and break it.

[0032] (2) Speed ​​reduction: Manually select the head-to-tail mode and start the 1# and 2# rolling mills. When the B2 and B2' signals disappear and the falling edge signal is triggered for 1 second, the 1# rolling mill speed reduction preparation command is automatically started.

[0033] In the head-to-tail mode, with both 1# and 2# rolling mills running, when 2# rolling mill is loaded and there is no signal from B2 and B2', the speed reduction command for 1# rolling mill is automatically started.

[0034] (3) Reset of the speed reduction preparation command: After the simulated rolling is completed and the speed reduction preparation command is started for 9 seconds, and when the No. 2 rolling mill is unloaded, the speed reduction preparation command is reset.

[0035] (4) Reset of the speed reduction command: The speed reduction command is reset after the speed reduction action reaches the speed reduction duration.

[0036] When the 1# and 2# rolling mills are not running, the furnace roller table is delayed for 3 seconds after reversal, or the furnace roller table stops suddenly, the speed reduction command will not be executed and the operation mode will automatically switch to manual mode.

[0037] The above embodiments are only for describing the preferred implementation of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the protection scope of the present invention.

[0038] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for rolling 14-meter steel billets on a bar line and its speed reduction warning, characterized in that: The following steps are involved: (1) Preparation: Install three hot metal detectors B1, B2 and B2' on the rolling line and connect them electrically to the operating table; Add a speed reduction selection dialog box on the HMI operation interface to set the speed reduction start delay time, speed reduction duration, and speed reduction ratio to achieve the speed reduction parameter setting of the 14-meter rolling mill No. 1; Added 2# rolling mill load early warning alarm on the HMI operation interface; (2) Speed ​​reduction: Manually select the head-to-tail mode and start the 1# and 2# rolling mills. When the B2 and B2' signals disappear and the falling edge signal is triggered for 1 second, the 1# rolling mill speed reduction preparation command is automatically started; In head-to-tail mode, with both 1# and 2# rolling mills running, when 2# rolling mill is loaded and B2 and B2' have no signals, the speed reduction command of 1# rolling mill is automatically started; (3) Reset of the speed reduction preparation command: After the simulated rolling is completed and the speed reduction preparation command is started for 9 seconds, and when the No. 2 rolling mill is unloaded, the speed reduction preparation command is reset; (4) Reset of the speed reduction command: The speed reduction command is reset after the speed reduction action reaches the speed reduction duration.

2. The method for rolling 14-meter steel billet head-to-tail and speed reduction warning of a bar line according to claim 1 is characterized in that: The hot metal detector B2 and the hot metal detector B2' are located on the rolling line 14.2 meters away from the center line of the rolling mill, and the hot metal detector B2 and the hot metal detector B2' are installed on the same side to detect the same position of the steel billet.

3. The method for rolling 14-meter steel billets on a bar line and its speed reduction warning according to claim 2 is characterized in that: The hot metal detector B1 is installed on the rolling line between the metal detector B2 and the heating furnace, and is close to the metal detector B2.

4. The method for rolling 14-meter steel billet head-to-tail and speed reduction warning of a bar line according to claim 1, characterized in that: The method for load early warning alarm of the 2# rolling mill described in step (1) is: manually set the alarm value, record the load time of the 2# rolling mill during normal rolling, when the load time of the 2# rolling mill exceeds the alarm value, the screen flashes and the buzzer on the operating table sounds an alarm, prompting the operator to roll the steel billet head and tail, and the 1# rolling mill has not slowed down, and it is necessary to immediately start the 1# flying shear or the 2# flying shear to manually cut the steel billet head and break it.

5. The method for rolling 14-meter steel billet head-to-tail and speed reduction warning of a bar line according to claim 1, characterized in that: The resetting of the speed reduction command described in step (4) is not executed when the 1# rolling mill and the 2# rolling mill are not running, the furnace roller is delayed for 3 seconds after reversing, and the furnace roller is stopped suddenly. The operation mode is automatically switched to manual mode.

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