CN112676359B - Method and device for preventing discharged plate blank from slipping - Google Patents
Method and device for preventing discharged plate blank from slipping Download PDFInfo
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- CN112676359B CN112676359B CN202011311595.4A CN202011311595A CN112676359B CN 112676359 B CN112676359 B CN 112676359B CN 202011311595 A CN202011311595 A CN 202011311595A CN 112676359 B CN112676359 B CN 112676359B
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Abstract
The invention provides a method and a device for preventing a discharged plate blank from slipping, which comprises the following steps: controlling a roller way in front of the heating furnace to rotate forwards for one time at a first speed; acquiring a first real-time current, and controlling the primary forward rotation to stop if the first real-time current is greater than a reference current; when the preset first delay time is reached, controlling the roller way to perform primary reversal according to a second speed; when the preset reversal duration is reached, sending a command of stopping reversal; when the second delay time is reached, controlling the roller way to rotate forward for the second time according to the first speed; acquiring a second real-time current, and controlling the roller way to stop running if the second real-time current is determined to be larger than the reference current; the contact state of the roller way and the plate blank is improved by controlling the corotation and the reversion of the roller way, so that the action line of the driving force of the roller way passes through the gravity center of the plate blank, thereby avoiding the plate blank from slipping.
Description
Technical Field
The invention belongs to the technical field of hot rolling, and particularly relates to a method and a device for preventing a discharged plate blank from slipping.
Background
On a hot-rolled strip production line, a heating furnace area is used as a supply side for heating a slab and then conveying the slab to a rolling line, and the continuous conveying of the qualified hot slab is a premise for stable production of the rolling line.
At present, the problems of uneven adhesion of iron scales on the lower surface, deformation of a plate blank, height difference of rollers of a discharging roller way and the like exist in the plate blank discharged from a heating furnace, so that the plate blank is easy to slip, incline and the like in the starting process on the discharging roller way. When the problems occur, manual adjustment is generally needed, but due to overlong manual adjustment time and large temperature drop, when the temperature of the slab cannot meet the rolling condition, the slab can only be descaled and then rolled back, so that unplanned shutdown is caused, the yield is reduced, and the waste of energy cost is increased.
And when the plate blank seriously moves on the roller way, equipment safety accidents are caused even when the plate blank impacts peripheral equipment of the roller way, and further the production efficiency is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for preventing a discharged plate blank from slipping, which are used for solving the technical problems that the yield of a product is reduced and the production efficiency is reduced when the discharged plate blank slips on a discharging roller way in the prior art.
The invention provides a method for preventing a discharged plate blank from slipping, which comprises the following steps:
after the heating plate blank is discharged from the furnace, controlling a roller way in front of the heating furnace to rotate forwards for one time at a first speed;
acquiring a first real-time current fed back by a frequency converter, and judging whether the first real-time current is greater than a preset reference current or not;
if the first real-time current is determined to be larger than the reference current, controlling the primary forward rotation to stop;
when the preset first delay time is reached, controlling the roller way to perform primary reversal according to a second speed;
when the preset reversal duration is reached, sending a stopping instruction for controlling the roller way to stop reversing;
when the preset second delay time is reached, controlling the roller way to rotate forward for the second time according to the first speed;
acquiring a second real-time current fed back by the frequency converter, and judging whether the second real-time current is greater than a preset reference current or not;
and if the second real-time current is determined to be larger than the reference current, controlling the roller way to stop running.
Optionally, the first speed is determined according to a rated speed of the motor, a roller diameter and a reduction ratio.
Optionally, the first delay time is 1 to 2s, and the second speed is half of the first speed.
Optionally, the inversion time length is 1 to 2s.
Optionally, the second delay time is 1 to 1.5s.
Optionally, after the roller way is controlled to stop operating, the method further includes:
and sending adjustment information for prompting an operator to perform manual intervention.
Optionally, after the stop instruction for controlling the roller way to stop reversing is sent, the method further includes:
pushing the first speed and the second speed to a display interface for displaying; the first speed and the second speed have different color designations.
The invention also provides a device for preventing the slabs discharged from the furnace from slipping, which comprises:
the control unit is used for controlling the roller way in front of the heating furnace to rotate forwards for one time at a first speed after the heating plate blanks are discharged from the heating furnace;
if the first real-time current is larger than the reference current, controlling the primary forward rotation to stop;
when the preset first delay time is reached, controlling the roller way to perform primary reverse rotation according to a second speed;
when the preset reversal duration is reached, sending a stopping instruction for controlling the roller way to stop reversing;
when the preset second delay time is reached, controlling the roller way to rotate forward for the second time according to the first speed;
the judging unit is used for acquiring a first real-time current fed back by the frequency converter and judging whether the first real-time current is larger than a preset reference current or not;
acquiring a second real-time current fed back by the frequency converter, and judging whether the second real-time current is greater than a preset reference current or not;
the control unit is further configured to: and if the second real-time current is determined to be larger than the reference current, controlling the roller way to stop running.
Optionally, the first speed is determined according to a rated speed of the motor, a roller diameter and a reduction ratio.
Optionally, the first delay time is 1 to 2s, and the second speed is half of the first speed.
The invention provides a method and a device for preventing a discharged plate blank from slipping, wherein the method comprises the following steps: after the heating plate blank is discharged from the furnace, controlling a roller way in front of the heating furnace to rotate forward for one time at a first speed; acquiring a first real-time current fed back by a frequency converter, and judging whether the first real-time current is greater than a preset reference current or not; if the first real-time current is determined to be larger than the reference current, controlling the primary forward rotation to stop; when the preset first delay time is reached, controlling the roller way to perform primary reversal according to a second speed; when the preset reversal duration is reached, sending a stopping instruction for controlling the roller way to stop reversing; when the preset second delay time is reached, controlling the roller way to rotate forward for the second time according to the first speed; acquiring a second real-time current fed back by the frequency converter, and judging whether the second real-time current is greater than a preset reference current or not; if the second real-time current is determined to be larger than the reference current, controlling the roller way to stop running; therefore, after the slab is discharged from the furnace, the contact state of the roller way and the slab is improved by controlling the corotation and the contrarotation of the roller way, so that the action line of the driving force of the roller way passes through the gravity center of the slab, thereby avoiding the slab slipping.
Drawings
FIG. 1 is a schematic flow chart of a method for preventing a discharged slab from slipping according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a device for preventing a discharged slab from slipping provided by the embodiment of the invention.
Detailed Description
The invention provides a method and a device for preventing a discharged plate blank from slipping, and aims to solve the technical problems that the yield of a product is lowered and the production efficiency is lowered when the discharged plate blank slips on a discharging roller way in the prior art.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
Example one
The embodiment provides a method for preventing a discharged slab from slipping, which comprises the following steps of:
s110, after the heating plate blank is discharged from the furnace, controlling a roller way in front of the heating furnace to rotate forwards for one time at a first speed;
and after the heating plate blank is discharged from the furnace, controlling a roller way (along the running direction of the strip steel) in front of the heating furnace to rotate forwards for one time at a first speed.
Here, the motor for driving the roller way to rotate is mainly controlled to rotate forward once. Generally, the first speeds set by different steel mills should be different, and the first speed can be determined according to the rated speed of the motor, the diameter of the roller and the reduction ratio. In this embodiment, the first speed may be 90m/min.
S111, acquiring a first real-time current fed back by a frequency converter, and judging whether the first real-time current is larger than a preset reference current or not; if the first real-time current is determined to be larger than the reference current, controlling the primary forward rotation to stop;
then, acquiring a first real-time current (the real-time current of the motor) fed back by the frequency converter, and judging whether the first real-time current is larger than a preset reference current or not; if the first real-time current is determined to be smaller than or equal to the preset reference current, the risk that the plate blank slips and inclines is low at the moment, and the plate blank can be normally conveyed to a rolling line to be subjected to subsequent process treatment. The first real-time current and the reference current are both set by a communication mechanism between the frequency converter and a controller (for example, a PLC), the communication mechanism is a decimal value, the full range is 16384, and the reference current may be 14000.
And if the first real-time current is determined to be larger than the reference current, the risks of slab slipping and inclination walking are high at the moment, and the forward rotation is controlled to stop once.
S112, when the preset first delay time is reached, controlling the roller way to perform primary reverse rotation at a second speed; when the preset reversal duration is reached, sending a stopping instruction for controlling the roller way to stop reversing;
and after the roller way stops rotating forward once, when the preset first delay time is reached, controlling the roller way to rotate backward once according to the second speed. Here, because the frequency converter has a slope buffering function when stopping, after stopping once forward rotation, the roller way needs to be delayed for a first time length and then controlled to perform once reverse rotation.
The first delay time period is 1-2 s (in this embodiment, the first delay time period is 2 s), and the second speed is half of the first speed, that is, 45m/min.
After the roller way is reversed for one time, when the preset reversal duration is reached, a stopping instruction for controlling the roller way to stop reversing is sent so as to control the roller way to stop reversing. The inversion time period is 1 to 2s, and the inversion time period in this embodiment is 2s.
As an optional embodiment, after sending a stop instruction for controlling the roller way to stop reversing, the method further includes:
pushing the first speed and the second speed to a display interface for displaying; the first speed and the second speed have different color designations. Thus, the operator can conveniently observe the values of the first speed and the second speed and the steering state.
Here, when the roller table is inverted, the slab may move backward by a slight distance (in a direction in which the slab is moving forward), and the detection element such as the heat detection may be erroneously touched. If the detection element such as the thermal detection is touched by mistake, the original slab tracking logic is triggered by mistake. In order to avoid the influence on the subsequent slab tracking, the slab tracking logic is prohibited to be executed after the roller way is controlled to rotate reversely due to slab slip.
S113, when the preset second delay time is reached, controlling the roller way to rotate forward for the second time according to the first speed;
for the same reason, the frequency converter has a slope buffering function when stopping, a delay time length also needs to be set after a stop instruction is sent, and when the preset second delay time length is reached, the roller way is controlled to rotate forward for the second time at the first speed.
The second delay time may be 1 to 1.5s, and the second delay time is set to 1s in this embodiment.
S114, obtaining a second real-time current fed back by the frequency converter, and judging whether the second real-time current is larger than a preset reference current or not; and if the second real-time current is determined to be larger than the reference current, controlling the roller way to stop running.
Similarly, when the roller way rotates forwards, a second real-time current fed back by the frequency converter is obtained, and whether the second real-time current is larger than a preset reference current or not is judged; if the second real-time current is still larger than the reference current, the slab inevitably slips and inclines if the slab continues to operate, and therefore the roller way is controlled to stop operating at the moment.
As an optional embodiment, after controlling the roller way to stop operating, the method further includes:
and sending adjustment information for prompting an operator to perform manual intervention, and prompting the operator to perform manual intervention adjustment.
As an alternative embodiment, if it is determined that the second real-time current is less than or equal to the reference current, the slab may be normally transported to the rolling line for subsequent process treatment.
Therefore, by controlling the forward rotation and the reverse rotation of the roller way, the contact state of the roller way and the plate blank can be improved to the maximum extent, the action line of the driving force of the roller way is ensured to pass through the gravity center of the plate blank, and the plate blank is prevented from inclining and slipping to the maximum extent; in addition, in the process of forward rotation and reverse rotation of the roller way, the iron scale on the surface of the strip steel can be separated, and the plate blank slippage caused by uneven adhesion of the iron scale is reduced.
Based on the same inventive concept, the invention also provides a device for preventing the discharged plate blank from slipping, which is detailed in the second embodiment.
Example two
The present embodiment provides an apparatus for preventing a tapped slab from slipping, as shown in fig. 2, the apparatus comprising: a control unit 21 and a judgment unit 22; wherein the content of the first and second substances,
the control unit 21 is used for controlling the roller way in front of the heating furnace to rotate forwards for one time at a first speed after the heating plate blanks are discharged from the heating furnace;
if the real-time current is determined to be larger than the reference current, controlling the primary forward rotation to stop;
when the preset first delay time is reached, controlling the roller way to perform primary reversal according to a second speed;
when the preset reversal duration is reached, controlling the roller way to stop reversing;
when the preset second delay time is reached, controlling the roller way to rotate forward for the second time according to the first speed;
the judging unit 22 is configured to obtain a first real-time current fed back by the frequency converter, and judge whether the first real-time current is greater than a preset reference current;
acquiring a second real-time current fed back by the frequency converter, and judging whether the second real-time current is greater than a preset reference current or not;
the control unit is further configured to: and if the second real-time current is determined to be larger than the reference current, controlling the roller way to stop running.
Specifically, after the heating plate blank is discharged, the control unit 21 is configured to control the roller table in front of the heating furnace (along the strip steel running direction) to rotate forward once at a first speed.
Here, the motor for driving the roller way to rotate is mainly controlled to rotate forwards for one time. Generally, the first speed set by different steel mills should be different, and the first speed can be determined according to the rated speed of the motor, the diameter of the roller and the reduction ratio. In this embodiment, the first speed may be 90m/min.
Then, the determining unit 22 obtains a first real-time current (a real-time current of the motor) fed back by the frequency converter, and determines whether the first real-time current is greater than a preset reference current; if the first real-time current is determined to be smaller than or equal to the preset reference current, the risk of slab slipping and inclination walking is low at the moment, and the slab can be normally conveyed to a rolling line for subsequent process treatment. The first real-time current and the reference current are both set by a communication mechanism between the frequency converter and a controller (for example, a PLC), the communication mechanism is a decimal value, the full range is 16384, and the reference current may be 14000.
If the first real-time current is determined to be larger than the reference current, which indicates that the risk of slab slipping and inclination walking is high at the moment, the control unit 21 controls the forward rotation to stop once.
After the roller way stops rotating forward once, when the preset first delay time is reached, the control unit 21 is used for controlling the roller way to rotate backward once according to the second speed. Here, because the frequency converter has a slope buffering function when stopping, after the forward rotation stops, the roller way needs to be delayed for a first time length and then controlled to rotate reversely for one time.
The first delay time period is 1-2 s (in this embodiment, the first delay time period is 2 s), and the second speed is half of the first speed, that is, 45m/min.
After the roller way is reversed once, when the preset reversal duration is reached, the control unit 21 is further configured to send a stop instruction for controlling the roller way to stop reversing, so as to control the roller way to stop reversing. The inversion time is 1 to 2s, and the inversion time in this embodiment is 2s.
As an alternative embodiment, after sending the stop instruction for controlling the roller way to stop reversing, the control unit 21 is further configured to:
pushing the first speed and the second speed to a display interface for displaying; the first speed and the second speed have different color designations. Thus, the operator can observe the values of the first speed and the second speed and the steering state conveniently.
Here, when the roller table is inverted, the slab may move backward by a slight distance (in a direction in which the slab is moving forward), and the detection element such as the heat detection may be erroneously touched. If the detection element such as the thermal detection is touched by mistake, the original slab tracking logic is triggered by mistake. In order to avoid the influence on the subsequent slab tracking, the slab tracking logic is prohibited to be executed after the roller way is controlled to rotate reversely due to slab slip.
For the same reason, since the frequency converter stops having a slope buffering function, after the stop instruction is sent, a delay time length also needs to be set, and when the preset second delay time length is reached, the control unit 21 controls the roller way to perform secondary forward rotation according to the first speed. The second delay time may be 1 to 1.5s, and the second delay time is set to 1s in this embodiment.
Similarly, when the roller way rotates forwards, a second real-time current fed back by the frequency converter is obtained, and whether the second real-time current is larger than a preset reference current or not is judged; if the second real-time current is still larger than the reference current, the slab inevitably slips and inclines if the slab continues to operate, and therefore the roller way is controlled to stop operating at the moment.
As an optional embodiment, after controlling the roller way to stop operating, the control unit 21 is further configured to:
and sending adjustment information for prompting an operator to perform manual intervention, and prompting the operator to perform manual intervention adjustment.
As an alternative embodiment, if it is determined that the second real-time current is less than or equal to the reference current, the slab may be normally transported to the rolling line for subsequent process treatment.
Therefore, by controlling the forward rotation and the reverse rotation of the roller way, the contact state of the roller way and the plate blank can be improved to the greatest extent, the action line of the driving force of the roller way can be ensured to pass through the gravity center of the plate blank, and the plate blank is prevented from inclining and slipping to the greatest extent; and in the process of forward rotation and reverse rotation of the roller way, the iron scale on the surface of the strip steel can be removed, and the slab slippage caused by uneven adhesion of the iron scale is reduced.
The method and the device for preventing the discharged plate blank from slipping provided by the embodiment of the invention have the following beneficial effects that:
the invention provides a method and a device for preventing a discharged plate blank from slipping, wherein the method comprises the following steps: after the heating plate blank is discharged from the furnace, controlling a roller way in front of the heating furnace to rotate forwards for one time at a first speed; acquiring a first real-time current fed back by a frequency converter, and judging whether the first real-time current is greater than a preset reference current or not; if the first real-time current is determined to be larger than the reference current, controlling the primary forward rotation to stop; when the preset first delay time is reached, controlling the roller way to perform primary reversal according to a second speed; when the preset reversal duration is reached, sending a stopping instruction for controlling the roller way to stop reversing; when the preset second delay time is reached, controlling the roller way to rotate forward for the second time according to the first speed; acquiring a second real-time current fed back by the frequency converter, and judging whether the second real-time current is greater than a preset reference current or not; if the second real-time current is determined to be larger than the reference current, controlling the roller way to stop running; therefore, after the slab is discharged from the furnace, the contact state of the roller way and the slab is improved by controlling the corotation and the reversion of the roller way, so that the action line of the driving force of the roller way can pass through the gravity center of the slab, thereby avoiding the slab from slipping and walking, simultaneously, because the corotation and the reversion of the roller way are in the process, the iron scale on the surface of the strip steel can be fallen off, and the slab slipping caused by uneven adhesion of the iron scale is reduced.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A method for preventing slipping of tapping slabs, characterized in that it comprises:
after the heating plate blank is discharged from the furnace, controlling a roller way in front of the heating furnace to rotate forwards for one time at a first speed;
acquiring a first real-time current fed back by a frequency converter, and judging whether the first real-time current is greater than a preset reference current or not;
if the first real-time current is determined to be larger than the reference current, controlling the primary forward rotation to stop;
when the preset first delay time is reached, controlling the roller way to perform primary reverse rotation according to a second speed;
when the preset reversal duration is reached, sending a stopping instruction for controlling the roller way to stop reversing;
when the preset second delay time is reached, controlling the roller way to rotate forward for the second time according to the first speed;
acquiring a second real-time current fed back by the frequency converter, and judging whether the second real-time current is greater than a preset reference current or not;
and if the second real-time current is determined to be larger than the reference current, controlling the roller way to stop running.
2. The method of claim 1, wherein the first speed is determined based on a rated speed of the motor, a roller diameter, and a reduction ratio.
3. The method of claim 1, wherein the first delay period is 1-2 s and the second speed is half the first speed.
4. The method of claim 1, wherein the inversion duration is 1-2 s.
5. The method of claim 1, wherein the second delay period is 1 to 1.5s.
6. The method of claim 1, wherein after controlling the roller track to stop operating, the method further comprises:
and sending adjustment information for prompting an operator to perform manual intervention.
7. The method according to claim 1, wherein after sending the stop instruction for controlling the roller way to stop reversing, the method further comprises:
pushing the first speed and the second speed to a display interface for displaying; the first speed and the second speed have different color designations.
8. An apparatus for preventing slipping of tapping slabs, characterized in that it comprises:
the control unit is used for controlling a roller way in front of the heating furnace to rotate forwards for one time at a first speed after the heating plate blank is discharged from the heating furnace;
if the first real-time current is determined to be larger than the reference current, controlling the primary forward rotation to stop;
when the preset first delay time is reached, controlling the roller way to perform primary reversal according to a second speed;
when the preset reversal duration is reached, sending a stopping instruction for controlling the roller way to stop reversing;
when the preset second delay time is reached, controlling the roller way to rotate forward for the second time according to the first speed;
the judging unit is used for acquiring a first real-time current fed back by the frequency converter and judging whether the first real-time current is larger than a preset reference current or not;
acquiring a second real-time current fed back by the frequency converter, and judging whether the second real-time current is greater than a preset reference current or not;
the control unit is further configured to: and if the second real-time current is determined to be larger than the reference current, controlling the roller way to stop running.
9. The apparatus of claim 8, wherein the first speed is determined based on a rated speed of the motor, a roller diameter, and a reduction ratio.
10. The apparatus of claim 8, wherein the first delay period is 1-2 s and the second speed is half the first speed.
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| CN202011311595.4A CN112676359B (en) | 2020-11-20 | 2020-11-20 | Method and device for preventing discharged plate blank from slipping |
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| CN108975041A (en) * | 2018-09-03 | 2018-12-11 | 重庆东登科技有限公司 | Coiled material winding tension real-time detection regulating system |
| CN110280602A (en) * | 2019-07-19 | 2019-09-27 | 北京宇轩智能科技有限公司 | Intelligent steel rolling rolling assessment system and processing method extremely |
| CN111250552A (en) * | 2020-01-16 | 2020-06-09 | 首钢京唐钢铁联合有限责任公司 | Method and device for avoiding deviation of plate blank |
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- 2020-11-20 CN CN202011311595.4A patent/CN112676359B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102764770A (en) * | 2009-04-10 | 2012-11-07 | 株式会社日立制作所 | Rolling device, control method of rolling device and rolling equipment |
| EP2679317A1 (en) * | 2012-06-29 | 2014-01-01 | Siemens Aktiengesellschaft | Method for operating a Steckel mill |
| CN103433294A (en) * | 2013-08-14 | 2013-12-11 | 首钢京唐钢铁联合有限责任公司 | Method for preventing slab from sliding at inlet of fixed width machine |
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