A continuous hot galvanizing line thick gauge production method

Abstract

The present application relates to a kind of continuous hot galvanizing line thick specification production method, belong to cold-rolled hot galvanizing equipment operation control method technical field.The technical scheme of the present application is: from raw material, judge the setting value issued, control entrance threading positioning and tail throwing positioning, carry out welding machine mode switching, tension adjustment, running speed control, tension leveler control and select winding mode, shield broken strip alarm hidden danger to avoid false alarm stop, avoid thick gauge strip steel damage double cutting shear and tension roller, carry out thick gauge strip steel production.The beneficial effects of the present application are: with the original conventional production mode can be seamlessly switched to each other;Develop the potential of production line, increase the variety, improve equipment utilization, create more benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to a continuous hot galvanizing line thick specification production method, and belongs to the technical field of cold rolling hot galvanizing equipment operation control method. BACKGROUND

[0002] At present, the continuous hot galvanizing line of Hansteel No. 1 Cold Rolling Mill is a 1500mm continuous hot galvanizing unit, with a design annual output of 350,000 tons. When the hot galvanizing line was designed and built, there was one resistance welding machine, and the production strip thickness was 0.8-4.0mm. The raw material is cold base 0.80-2.4mm and hot base 1.2-4.0mm. When producing thick specifications above 3.0mm, the welding effect is not good, and at the same time, because of the problems of welding machine welding capacity, inlet double cutting shear cutting thickness and production operation mode, etc., thick specifications of strip steel cannot be produced. In order to adapt to market demand and benchmark with the same industry production line, tap the production line capacity, realize the expansion of thick specifications above 3.0mm, it is necessary to fill the gap of 4.0mm-6.0mm thickness specification hot galvanizing products. SUMMARY

[0003] The purpose of the present application is to provide a continuous hot galvanizing line thick specification production method, which is based on the production function of the inherent hot galvanizing line, judges the set value from the raw material, controls the inlet strip positioning, tail positioning, welding machine mode switching, tension adjustment, running speed control, tension leveler control and coiling mode, etc., shields the broken strip alarm hidden danger to avoid false alarm stop, avoids thick specification strip steel damage to double cutting shear and tension roller, produces thick specification strip steel, and can be seamlessly switched with the original conventional production method. The potential of the production line is developed, the variety is increased, the equipment utilization rate is improved, more benefits are created, and the above-mentioned problems existing in the background art are effectively solved.

[0004] The technical scheme of the present application is: a continuous hot galvanizing line thick specification production method, comprising the following steps:

[0005] Step one, process automation system setting, adjusting thickness limit value, confirming tracking data information, adjusting production plan sequence;

[0006] Step two, inlet area process control, judging the set value from the raw material, controlling the inlet strip speed and the inlet tail speed, and performing inlet strip positioning and inlet tail positioning;

[0007] Step three, welding machine mode selection, welding machine cutting strip head and tail, selecting welding machine mode according to base material type and thickness for welding;

[0008] Step four, process area process control, shielding broken strip alarm, and performing tension leveler control;

[0009] Step five, outlet area process control, outlet strip speed, and performing coiling machine control;

[0010] Step six, full line detection, increase tension roll and winch torque upper limit, monitor the focus motor state;

[0011] Step seven, end, no problem detection, end process.

[0012] The step one, comprising the following steps:

[0013] Step 1-1: the process automation system, namely the secondary system, adjusts the thickness limit value in the raw material limit setting, and adjusts the limit value from 4.0 mm to 6.0 mm, allowing the request of the raw material coil to be on line;

[0014] Step 1-2: confirm the steel coil base type, production speed and tension data information, and ensure that the tracking data is correct when the unit is running;

[0015] Step 1-3: adjust the production plan sequence, and produce similar thickness specifications in turn;

[0016] Step 1-4: the secondary system screen synchronizes the actual entry step beam coil.

[0017] The step two, comprising the following steps:

[0018] Step 2-1: the basic automation system, namely the primary system, enters the screen two uncoilers alternately, and requests the raw material coil to be set;

[0019] Step 2-2: according to the request, the 4.0-6.0 mm specification raw material strip setting value is issued;

[0020] Step 2-3: if it is a threading state, go to step 2-4; if it is a tail throwing state, go to step 2-5;

[0021] Step 2-4: entry threading speed control, the threading speed is set to 35 m / min, the entry slitting shear does not perform the head cutting action according to the base type and thickness, the head is positioned to the welding shear, and goes to step three;

[0022] Step 2-5: entry tail throwing speed control, the tail throwing speed is set to 35 m / min, the entry slitting shear does not perform the tail cutting action according to the base type and thickness, the tail is positioned to the welding shear, and goes to step three.

[0023] The step three, comprising the following steps:

[0024] Step 3-1: after the thick gauge head and tail are positioned to the welding machine, the welding shear cuts the head and tail;

[0025] Step 3-2: compare the information of the two coils before and after the welding machine, query the welding parameter table to determine whether to use the laser welding mode from the base material type and thickness, if yes, go to step 3-3; otherwise, go to step 3-4.

[0026] Step 3-3: laser welding mode is started, laser welding machine is welded, strip steel jog speed is 25m / min, welding quality is checked, and step four is turned to;

[0027] Step 3-4: resistance welding mode is started, resistance welding machine is welded, strip steel jog speed is 25m / min, welding quality is checked, and step four is turned to.

[0028] In the step four, the following steps are included:

[0029] Step 4-1: process section motor clutch logic optimization, avoid thick gauge strip steel stop in the heating furnace;

[0030] Step 4-2: avoid motor failure during production process to cause emergency shutdown of the whole line, temporarily seal the point caused by process section motor failure shutdown chain;

[0031] Step 4-3: query production speed parameter table setting, read process production speed from raw material, width and thickness;

[0032] Step 4-4: compared with the original control, the edger delay five meters open and five meters ahead, improve the plate shape.

[0033] In the step five, the following steps are included:

[0034] Step 5-1: judge the exit state, if it is a wearing state, go to step 5-2; if it is a tail state, go to step 5-6;

[0035] Step 5-2: exit wearing speed control, wearing speed is set to 25m / min;

[0036] Step 5-3: exit secondary wearing speed control, wearing speed is set to 40m / min, so that the speed can be smoothly transitioned to the exit production speed, reducing the load of the exit tension roller;

[0037] Step 5-4: the upper limit of the coiler tension is increased by 20%, and the coiling mode is selected as high strength, which is different from the secondary expansion of the coiler for thin gauge strip steel;

[0038] Step 5-5: the press roller of the coiler is pressed when running, which is beneficial to the edge alignment, and when the strip head passes through the turning roller 1000mm during wearing, the wrong edge coiling mode is selected;

[0039] Step 5-6: exit tail speed control, tail speed is set to 35m / min;

[0040] Step 5-7: Unloading, when the exit coil car is fully contacted with the steel coil, the press roller is opened.

[0041] The step six comprises the following steps:

[0042] Step 6-1: The upper limit of the full line tension roller torque is increased by 20%, and the thick specification is increased in the tension roller;

[0043] Step 6-2: The upper limit of the inlet and outlet loop winch torque is increased by 20%, to ensure the loop tension;

[0044] Step 6-3: Monitor the temperature and current of the key motor to prevent motor damage.

[0045] The beneficial effects of the present application are: based on the production function of the inherent hot galvanizing line, the set value is judged from the raw material, the inlet threading positioning, the tail positioning, the welding machine mode switching, the tension adjustment, the running speed control, the tension leveler control and the coiling mode are controlled, the hidden danger of the strip breakage alarm is shielded to avoid false alarm and parking, the thick specification strip steel is prevented from damaging the double cutting shear and the tension roller, the thick specification strip steel production is carried out, and the original conventional production mode can be seamlessly switched; the potential of the production line is developed, the variety is increased, the equipment utilization rate is improved, and more benefits are created. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 The method flowchart of the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the embodiment of the application clearer, the technical scheme in the embodiment of the application will be clearly and completely described below in combination with the drawings in the embodiment. Obviously, the described embodiment is a part of the embodiments of the application, not all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0048] A continuous hot galvanizing line thick specification production method comprises the following steps:

[0049] Step one, process automation system setting, adjusting thickness limit value, confirming tracking data information, adjusting production plan sequence;

[0050] Step two, inlet area process control, judging the set value from the raw material, controlling the inlet threading speed and the inlet tail speed, and carrying out the inlet threading positioning and the inlet tail positioning;

[0051] Step three, welding machine mode selection, welding machine cutting strip head and tail, selecting welding machine mode according to base material type and thickness for welding;

[0052] Step four, process area control, shield the broken strip alarm, proceed to the pull straightener control;

[0053] Step five, exit area process control, exit strip speed, proceed to the coiler control;

[0054] Step six, full line detection, increase the upper limit of the tension roll and the winch torque, monitor the key motor status;

[0055] Step seven, end, detect no problems, end the process.

[0056] In the step one, the following steps are included:

[0057] Step 1-1: The process automation system, i.e., the secondary system, adjusts the thickness limit value in the raw material limit setting, and adjusts the limit value from 4.0 mm to 6.0 mm, allowing the request of the raw material coil to be online;

[0058] Step 1-2: Confirm the steel coil base type, production speed, and tension data information to ensure that the tracking data is correct when the unit is running;

[0059] Step 1-3: Adjust the production plan sequence, and produce similar thickness specifications in sequence;

[0060] Step 1-4: The secondary system screen synchronizes the actual entry step beam coil.

[0061] In the step two, the following steps are included:

[0062] Step 2-1: The basic automation system, i.e., the primary system, alternately operates the two uncoilers in the entry screen, and requests the raw material coil to be issued with a set value;

[0063] Step 2-2: According to the request, issue the 4.0-6.0 mm specification raw material strip set value at the entry;

[0064] Step 2-3: If it is a threading state, go to step 2-4; if it is a tail throwing state, go to step 2-5;

[0065] Step 2-4: Entry threading speed control, the threading speed is set to 35 m / min, the entry slitting shear does not perform the head cutting action according to the base type and thickness, the head is positioned to the welder shear, and goes to step three;

[0066] Step 2-5: Entry tail throwing speed control, the tail throwing speed is set to 35 m / min, the entry slitting shear does not perform the tail cutting action according to the base type and thickness, the tail is positioned to the welder shear, and goes to step three.

[0067] In the step three, the following steps are included:

[0068] Step 3-1: After the thick gauge strip head and tail are positioned to the welding machine, the welding machine shears the strip head and tail;

[0069] Step 3-2: Compare the information of the two coils before and after the welding machine, and query the welding parameter table to determine whether to use the laser welding mode from the base material type and thickness. If yes, go to step 3-3; otherwise, go to step 3-4.

[0070] Step 3-3: The laser welding mode is started, and the laser welding machine is welded. The strip steel jogging speed is 25 meters per minute. Check the welding quality and go to step four;

[0071] Step 3-4: The resistance welding mode is started, and the resistance welding machine is welded. The strip steel jogging speed is 25 meters per minute. Check the welding quality and go to step four.

[0072] In the step four, the following steps are included:

[0073] Step 4-1: Optimize the motor brake logic of the process section to avoid thick gauge strip steel stopping in the heating furnace;

[0074] Step 4-2: Avoid motor failure during production process to cause emergency shutdown of the whole line. Temporarily seal the point caused by process section motor failure shutdown chain;

[0075] Step 4-3: Query the production speed parameter table to set the process production speed from raw material, width and thickness;

[0076] Step 4-4: The tension leveler is opened five meters later than the original control and put into five meters in advance to improve the plate shape.

[0077] In the step five, the following steps are included:

[0078] Step 5-1: Determine the exit state. If it is a threading state, go to step 5-2; if it is a tail throwing state, go to step 5-6;

[0079] Step 5-2: Control the exit threading speed, and set the threading speed to 25 meters per minute;

[0080] Step 5-3: Control the exit secondary threading speed, and set the threading speed to 40 meters per minute to make the speed smoothly transition to the exit production speed and reduce the load of the exit tension roller;

[0081] Step 5-4: Increase the upper limit of the coiler tension by 20%, and select the high strength coiling mode, which is different from the secondary expansion of the coiler for thin gauge strip steel;

[0082] Step 5-5: When the coiler pressure roller is running, it is pressed to facilitate the edge alignment. When the strip head passes through the deflection roller 1000mm during threading, the wrong edge coiling mode is selected;

[0083] Step 5-6: outlet tail speed control, tail speed is set to 35 m / min;

[0084] Step 5-7: unload the roll, when the outlet coil car completely contacts the steel coil, the press roller is opened.

[0085] The step six comprises the following steps:

[0086] Step 6-1: the upper limit of the full-line tension roller torque is increased by 20%, and the gripping force of the thick specification on the tension roller is increased;

[0087] Step 6-2: the upper limit of the inlet and outlet loop winch torque is increased by 20%, to ensure the loop tension;

[0088] Step 6-3: monitor the temperature and current of the key motor to prevent motor damage.

[0089] The present application is based on the existing equipment capacity, and all centers on "on-site trial", emancipates the mind and boldly tries to expand thick specifications, around the general idea of "test-improve-retest", constantly improving and optimizing in constant trial, to achieve the target thickness of 6.0 mm. Based on the production function of the inherent hot galvanizing line, under the condition that the motor power of each tension roller of the unit meets the expansion requirements, the original production mode is expanded, the thick specification mode production is increased, and the process automation and basic automation system functions are improved. When producing 4.0-6.0 mm thick specification strip steel, the program is switched to production mode to realize thick specification production, mainly increasing the laser welding machine on the equipment to deal with thick specification strip steel welding, shielding alarm hidden danger to avoid false alarm stop, avoiding thick specification strip steel damage to the straightening machine roller and pinch roller. The original conventional production mode can be seamlessly switched; the potential of the production line is developed, the variety is increased, the equipment utilization rate is improved, more benefits are created, and it can be applied to most hot-based galvanizing production lines, and has great popularization prospect.

[0090] According to the operation method, the effect can be created throughout the year: 4.0-6.0 mm thick specification expansion can produce 2000 tons / month, 4.0-6.0 mm thick specification ton steel profit is about 150 yuan, and the effect is created throughout the year: 2000 tons*12 months*150 yuan=3.6 million yuan.

Claims

1. A method for producing thick gauge on a continuous hot dip galvanizing line, characterized by Comprising the following steps: Step one, process automation system settings, adjust the thickness limit value, confirm tracking data information, adjust the production plan sequence; Step two, entry area process control, determine the set value from the raw material, control the entry speed and the entry tail speed, perform entry positioning and entry tail positioning; Step three, welding machine mode selection, welding machine shearing strip head and tail, selecting welding machine mode according to base material type and thickness for welding; Step four, process area process control, shielding broken strip alarm, performing pull straightener control; Step five, exit area process control, exit strip speed, performing coiler control; Step six, full line detection, increasing tension roller and winch torque upper limit, monitoring key motor status; Step seven, end, detecting no problem, ending the process; In the step two, comprising the following steps: Step 2-1: basic automation system, i.e. first level system, entry screen, two uncoilers alternate coil loading operation, request raw material coil to issue set value; Step 2-2: according to the request, issue 4.0-6.0 mm specification raw material strip set value; Step 2-3: if it is a strip state, go to step 2-4; if it is a tail state, go to step 2-5; Step 2-4: entry strip speed control, strip speed is set to 35 m / min, according to base material type and thickness, determine that the entry slitting shear does not perform head cutting action, the head is positioned to the welding machine shear, and goes to step three; Step 2-5: entry tail speed control, tail speed is set to 35 m / min, according to base material type and thickness, determine that the entry slitting shear does not perform tail cutting action, the tail is positioned to the welding machine shear, and goes to step three; In the step three, comprising the following steps: Step 3-1: after the thick specification strip head and tail are positioned to the welding machine, the welding machine shears the strip head and tail; Step 3-2: compare the information of the two coils before and after the welding machine, query the welding parameter table set from the base material type and thickness to determine whether to use laser welding mode, if yes, go to step 3-3; otherwise, go to step 3-4; Step 3-3: laser welding mode starts, laser welding machine completes welding, strip jog speed is 25 m / min, check welding quality, and goes to step four; Step 3-4: resistance welding mode starts, resistance welding machine completes welding, strip jog speed is 25 m / min, check welding quality, and goes to step four.

2. A method of producing thick gauge on a continuous galvanizing line as claimed in claim 1, characterized in that: In the step one, comprising the following steps: Step 1-1: process automation system, i.e. second level system, adjusts the thickness limit value in the raw material limit setting, adjusts the limit value from 4.0 mm to 6.0 mm, and allows the request of raw material coil online; Step 1-2: confirm the base material type, production speed and tension data information of the coil, and ensure that the tracking data is correct when the unit is running; Step 1-3: adjust the production plan sequence, and produce similar thick specifications in turn; Step 1-4: the second level system screen synchronizes the actual entry step beam coil.

3. A method of producing thick gauge on a continuous galvanizing line as claimed in claim 1, wherein: In the step four, comprising the following steps: Step 4-1: process section motor brake logic optimization, avoid thick specification strip steel stopping in the heating furnace; Step 4-2: avoid full line emergency stop caused by motor failure during production, temporarily seal the point caused by process section motor failure stop chain; Step 4-3: Inquiring the setting in the production speed parameter table, reading the process production speed from the raw material, width and thickness; Step 4-4: The delay of five meters opening and five meters in advance of the strip shape improvement plate type of the drawing and straightening machine compared to the original control.

4. A method of producing thick gauge on a continuous galvanizing line as recited in claim 1, wherein: The step five contains the following steps: Step 5-1: judging the exit state, if it is the wearing state, turn to step 5-2; if it is the tail state, turn to step 5-6; Step 5-2: the exit wearing speed control, the wearing speed is set to 25m / min; Step 5-3: the second wearing speed control of the exit, the wearing speed is set to 40m / min, so that the speed can be smoothly transitioned to the exit production speed, reducing the exit tension roll load; Step 5-4: the upper limit of the coiler tension is increased by 20%, and the coiler mode is selected as high strength, which is different from the second expansion of the coiler of the thin specification strip steel; Step 5-5: the press roll of the coiler is pressed when running, which is beneficial to the edge alignment, and when the strip head passes through the turning roll 1000mm during wearing, the wrong edge winding mode is selected; Step 5-6: the exit tail speed control, the tail speed is set to 35m / min; Step 5-7: unloading, when the exit steel coil car completely contacts the steel coil, the press roll is opened.

5. A method of producing thick gauge on a continuous galvanizing line as claimed in claim 1, wherein: The step six contains the following steps: Step 6-1: the upper limit of the whole line tension roll torque is increased by 20%, increasing the holding force of the thick specification in the tension roll; Step 6-2: the upper limit of the inlet and outlet loop winch torque is increased by 20%, ensuring the loop tension; Step 6-3: monitoring the temperature and current of the key motor to prevent motor damage.

Images