CN113909300A - Power-saving control system and method for roller way of medium plate finishing mill - Google Patents
Power-saving control system and method for roller way of medium plate finishing mill Download PDFInfo
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- CN113909300A CN113909300A CN202111139231.7A CN202111139231A CN113909300A CN 113909300 A CN113909300 A CN 113909300A CN 202111139231 A CN202111139231 A CN 202111139231A CN 113909300 A CN113909300 A CN 113909300A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims abstract description 148
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 238000003825 pressing Methods 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 16
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000881 depressing effect Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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Abstract
The invention relates to a moderate thickness plate mill roller way electricity-saving control system and a method, comprising a finishing mill body and a finishing mill controller, wherein the front end of the finishing mill is provided with a front working roller way and a front roller way group, and the rear end of the finishing mill is provided with a rear working roller way and a rear roller way group; before each pass of the finishing mill is not rolled, the rolling mill control system calculates the length of the steel plate after the rolling of the pass is finished in advance, and according to the length of the front and rear roller ways of the finishing mill required by the length calculation of the steel plate, the grouping control of the front and rear roller ways of the finishing mill is automatically finished, so that the purposes of automatic grouping and automatic commissioning of the roller ways are achieved, the utilization efficiency of the roller ways is effectively improved, and the energy-saving effect is achieved.
Description
Technical Field
The invention belongs to the field of production and control of medium plate rolled steel plates, and relates to a system and a method for roll table electricity-saving control of a medium plate mill.
Background
In the process of rolling the steel plate by the finishing mill, the front and rear roller ways and the rolling main machine are basically operated manually, and the front 8 groups of roller ways of the finishing mill, the front and rear working roller ways of the finishing mill and the rear 8 groups of roller ways of the finishing mill and the rolling main machine are moved manually by an operator in a linkage mode. Therefore, no matter how long the steel plate is rolled by the finishing mill, all roller ways in the finishing rolling area can participate in control, the rolled steel plate is shorter in the early stage of rolling the steel plate, a large number of conveying roller ways participate in control, a large amount of electric power is wasted, and the energy conservation of the roller ways is not facilitated.
Disclosure of Invention
In view of the above, the present invention provides a method for controlling roller way power saving of a heavy and medium plate mill, wherein before each pass of a finishing mill is not rolled, a mill control system calculates the length of a steel plate after the pass is rolled in advance, and according to the length of the roller way before and after the finishing mill, which is required by the length calculation of the steel plate, the roller way before or after the finishing mill is controlled in groups, so as to achieve the purpose of automatic grouping and automatic commissioning of the roller ways, effectively improve the utilization efficiency of the roller ways, and achieve the effect of energy saving.
In order to achieve the purpose, the invention provides the following technical scheme:
on one hand, the invention provides a roller way electricity-saving control system of a heavy and medium plate mill, which comprises a finishing mill body and a finishing mill controller, wherein a front working roller way and a front roller way group are arranged at the front end of the finishing mill, and a rear working roller way and a rear roller way group are arranged at the rear end of the finishing mill;
the finishing mill body comprises an upper roll system and a lower roll system, the upper roll system is connected with an upper roll system pressing motor, the upper roll system pressing motor is driven by a rolling mill pressing motor frequency converter, and the rolling mill pressing motor frequency converter is controlled by a finishing mill controller;
the machine front working roller way, the machine front roller way group, the machine rear working roller way and the machine rear roller way group are respectively driven by a machine front working roller way driving motor, a machine front roller way group driving motor, a machine rear working roller way driving motor and a machine rear roller way group driving motor; the machine front working roller way driving motor, the machine front roller way group driving motor, the machine rear working roller way driving motor and the machine rear roller way group driving motor are respectively driven by a machine front working roller way frequency converter, a machine front roller way group frequency converter, a machine rear working roller way frequency converter and a machine rear roller way group frequency converter which are controlled by a finish rolling machine controller.
Further, the upper roll system comprises an upper rolling working roll and an upper support; the lower roll system comprises a lower rolling working roll and a lower support.
Furthermore, the rolling mill further comprises a pressing displacement sensor used for measuring the roll gap value between the upper rolling working roll and the lower rolling working roll, and the pressing displacement sensor is arranged on the finishing mill body and connected with the finishing mill controller.
Furthermore, the upper rolling working roll and the lower rolling working roll are both connected with corresponding main machine motors; the main motor is driven by the main transmission system; and the finishing mill controller sends a control command to the main transmission system to drive the main motor and drive the upper rolling working roll and the lower rolling working roll to move forwards or backwards.
On the other hand, the invention provides a roller way electricity-saving control method of a heavy and medium plate mill, which comprises the following steps:
s1: the finishing mill is ready for rolling, a finishing mill controller starts a front roller way set of the machine, and a steel plate to be rolled is conveyed to a front working roller way of the machine;
s2: the finish rolling machine controller sends a reduction control instruction to an upper roll system according to a roll gap set value of the rolling model; the pressing displacement sensor feeds back the actual roll gap value of the finishing mill in real time, and when the deviation between the actual roll gap value of the finishing mill and the set value of the model roll gap is within an allowable range, the finishing mill controller drives the upper roll system to stop pressing and generates a positioning completion signal;
s3: after finishing roll gap positioning is finished, the finishing mill controller calculates the length of a rolled steel plate through a pre-calculation formula of the steel plate to be rolled according to the thickness, the width and the length of the current steel plate raw material to be rolled, the planned width of a rolled finished product and a roll gap value of the finishing mill fed back by the rolling displacement sensor;
s4: the finish rolling mill controller judges the control flow according to the rolling state of the steel plate, and if the rolling direction is rolling in the front-to-back direction, the step S5 is carried out; if the rolling direction is rolling towards the rear part and rolling towards the front part, the step S6 is carried out;
s5: rolling the steel plate in front of the rolling mill and in back of the rolling mill, automatically controlling the back roller ways of the rolling mill in groups by the finish rolling mill controller according to the calculated value of the predicted length of the steel plate and the layout position of the back roller ways of the rolling mill and the principle requirement that the length of the back roller ways of the rolling mill along the rolling center line must be larger than the predicted length of the steel plate; after the finishing mill controller automatically selects the rear roller ways to group, the step S7 is carried out;
s6: rolling towards the rear part of the mill, and automatically controlling the front roller ways in groups by the finish rolling mill controller according to the calculated value of the predicted length of the steel plate and the layout position of the front roller ways and the principle requirement that the length of the front roller ways along the rolling center line is larger than the predicted length of the steel plate; after the finish rolling machine controller automatically selects the front roller ways of the machine to group, performing step S7;
s7: the finishing mill controller sets in groups according to roller ways selected by the program flow, and sends a control instruction to the corresponding frequency conversion device to finish the rolling of the current pass;
s8: after the rolling of the current pass is finished, the finishing mill controller judges whether the current pass reaches the last pass, and if the current pass does not reach the last pass, the step S2 is carried out; if the current pass reaches the last pass, the step S9 is executed;
s9: and if the rolling is finished, the finishing mill controller starts all roller ways behind the machine and conveys the rolled steel plate to the post-process.
Further, the precalculated formula of the steel plate to be rolled in step S3 is as follows:
wherein predictedLength is the predicted length, and the unit of the calculation result is millimeter; round () is the calculation formula rounding;
slabthk is the thickness of the raw material; the width of the slabwid is taken as the width of the raw material; slblen is the length of the raw material; alpha is the density of the billet material; beta is the burning loss coefficient of the raw material; χ is the slip coefficient before rolling; delta is a calculated gain factor; f _ h _ hot is a finishing mill roll gap value fed back by the finish rolling reduction displacement sensor; PlanWidth is the planned width of the rolled finished product; epsilon is the density of the finished steel plate; and A is the rolling and steel polishing distance.
The invention has the beneficial effects that: the invention provides a method for controlling the roller way electricity saving of a medium and heavy plate mill, which is characterized in that the length of a steel plate after the rolling of the current pass is finished is calculated in advance before each pass of a finishing mill is not rolled, and the roller ways of the finishing mill are automatically controlled in groups according to the calculated length of the steel plate, so that the purposes of automatic grouping and automatic commissioning of the roller ways are achieved, the utilization efficiency of the roller ways is effectively improved, and the energy-saving effect is achieved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of a roll table electricity-saving control system of a finishing mill for medium and heavy plates according to the present invention;
FIG. 2 is a flow chart of the roll table electricity-saving control method of the finishing mill for medium plate according to the present invention;
reference numerals: the device comprises a finish rolling upper and lower rolling working roll 1, a finish rolling upper and lower support 2, a finish rolling reduction displacement sensor 3, a finish rolling machine front working roll table 4, a finish rolling machine rear working roll table 5, a finish rolling machine front roll table group 6-13, a finish rolling machine rear roll table group 14-21, a finish rolling machine controller 22, a finish rolling host motor 101, a finish rolling machine main transmission system 102, an upper roll system depressing motor 201, a depressing motor frequency converter 202, a roll table driving motor 601 and 1301, a front roll table frequency converter 602 and 1302, a rear roll table driving motor 1401 and 2101, a rear roll table frequency converter 1402 and 2102, a rear working roll table driving motor 501 and a rear working roll table frequency converter 502.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the invention provides an electricity-saving control system for a roller way of a finishing mill for medium and heavy plates, which comprises 1-8 groups (6-13) of front roller ways of the finishing mill, 4 groups of front working roller ways of the finishing mill, a finishing mill body, 5 groups of rear working roller ways of the finishing mill, and 1-8 groups (14-21) of rear roller ways of the finishing mill, which jointly form a rolling control system of the finishing mill; the finishing mill body consists of an upper and a lower finishing rolling working rolls 1 and an upper and a lower finishing rolling supports 2; the finish rolling upper rolling working roll 1 and the finish rolling upper supporting roll form a finish rolling upper roll system, and the finish rolling upper roll system is connected with a corresponding upper roll system pressing motor 201; the upper roll system pressing motor 201 is driven by a rolling mill pressing motor frequency converter 202; the finishing mill controller 22 sends a control command to the rolling mill depressing motor frequency converter 202, and the rolling mill depressing motor frequency converter 202 drives the upper roll system depressing motor 201 to complete the upward and downward depressing movement of the upper roll system. The finish rolling reduction displacement sensor 3 measures a roll gap value between the upper and lower rolling work rolls 1 of the finish rolling mill, and feeds back the roll gap of the finish rolling mill to the finish rolling mill controller 22 in real time. The 1-8 groups (6-13) of the front roller ways of the finishing mill are connected with the driving motors (601) and 1301) of the front roller ways of each group corresponding to the finishing mill; each group of roller way driving motors (601 and 1301) are driven by a front roller way frequency converter (602 and 1302); the finishing mill controller 22 sends a control command to the front 1-8 groups of roller way frequency converters (602-. The finishing mill front working roller way 4 is connected with a corresponding front working roller way driving motor 401; the front working roller way driving motor 401 is driven by a front working roller way frequency converter 402; the finishing mill controller 22 sends a control instruction to the finishing mill front working roller way frequency converter 402, and the finishing mill front working roller way driving motor 201 moves forward or backward. The upper and lower rolling working rolls 1 of the finishing mill are connected with corresponding finishing mill main machine motors 101; a finishing main motor 101 is driven by a finishing mill main transmission system 102; the finishing mill controller 22 sends a control command to the finishing mill main drive system 102 to drive the finishing mill main motor 101 to move forward or backward. The finishing mill rear working roller table 5 is connected with a corresponding rear working roller table driving motor 501; a driving motor 501 of the rear working roller way is driven by a frequency converter 502 of the rear working roller way; the finishing mill controller 22 sends a control instruction to the finishing mill rear working roller way frequency converter 502, and drives the machine rear working roller way driving motor 501 to move forward or backward. The finishing mill rear roller way 1-8 groups (14-21) are connected with the rear roller way driving motors (1401-2101) corresponding to each group; each group of roller way driving motors (1401 and 2101) are driven by a rear roller way frequency converter (1402 and 2102); the finishing mill controller 22 sends a control command to the roller way frequency converters (1402) and 2102) in the back 1-8 groups, and drives the roller way motors (1401 and 2101) in the back of the machine to move forwards, backwards or stop moving.
Referring to fig. 2, a control method of the present system specifically includes the following steps:
s1, the finishing mill is ready for rolling, the finishing mill controller 22 starts 1-8 groups (6-13) of the front roller way of the finishing mill, and the steel plate to be rolled is conveyed to the front working roller way 4 of the finishing mill;
s2, the finishing mill controller 22 sends a rolling control command to the finishing upper roll system according to the roll gap set value of the rolling model. And the finish rolling reduction displacement sensor 3 feeds back the actual roll gap value of the finish rolling mill in real time, and when the deviation between the actual roll gap value of the finish rolling mill and the set value of the model roll gap is within an allowable range, the finish rolling mill controller 22 drives the upper roll system to stop reducing and generates a positioning completion signal.
S3, after the finish roll gap positioning is finished, the finish rolling mill controller 22 according to the thickness, width and length of the current steel plate raw material to be rolled, the planned width of the rolled finished product and the finish rolling mill roll gap value fed back by the finish rolling reduction displacement sensor 3,
and calculating the length of the rolled steel plate through a pre-calculation formula of the steel plate to be rolled. The precalculated formula of the steel plate to be rolled is as follows:
predictedLength is the predicted length, and the unit of the calculation result is millimeter; round () rounds the calculation formula.
slabthk is the thickness of the raw material; the width of the slabwid is taken as the width of the raw material; slblen is the length of the raw material;
7.8 is the density of the billet raw material; 0.98 is the burning loss coefficient of the raw material; 1.01 is the slip coefficient before rolling;
0.99 is the calculated gain factor;
f _ h _ hot is a finishing mill roll gap value fed back by the finish rolling reduction displacement sensor 3;
PlanWidth is the planned width of the rolled finished product;
7.85 is the density of the finished steel plate; and 1500 is rolling and steel throwing distance.
An example of the calculation is as follows:
s4, the finishing mill controller 22 judges the control flow according to the rolling state of the steel plate, if the rolling direction is rolling from front to back, the step S5 is entered; if the rolling direction is post-mill rolling, the process proceeds to step S6.
S5, rolling the steel plate in front of the rolling mill and in back of the rolling mill, the finishing mill controller 22 automatically controls the back roller ways in groups according to the calculated value of the predicted length of the steel plate and the layout position of the back roller ways according to the principle that the length of the back roller ways along the rolling center line must be larger than the predicted length of the steel plate. The finish rolling mill controller 22 automatically selects the post-mill table group, and then proceeds to step S7.
Such as: in the example of calculation, in the 1 st pass, rolling is performed before and after the finishing mill, the predicted length of the steel plate is 19915mm, the length of the rear working roll and the rear 1 set of roll tables is 14680+ 7200-21880 mm, then the length of the rear working roll and the rear 1 set of roll tables is greater than the predicted length of the steel plate, and the finishing mill controller 22 automatically selects the rear working roll and the rear 1 set of roll tables for automatic control.
And S6, rolling the steel plate towards the front part of the rolling mill, and automatically controlling the front roller ways of the rolling mill in groups by the finishing mill controller 22 according to the calculated value of the predicted length of the steel plate and the layout position of the front roller ways of the rolling mill and the principle requirement that the length of the front roller ways of the rolling mill along the rolling center line must be larger than the predicted length of the steel plate. The finish rolling mill controller 22 automatically selects the pre-mill run group, and then proceeds to step S7.
Such as: in the example of calculation, after the finishing mill is rolled to the front of the finishing mill in the 2 nd pass, the predicted length of the steel plate is 22847mm, and the lengths of the front working roll and the front 2 groups of roller ways are 14680+7200+ 29080mm, so that the lengths of the front working roll and the front 2 groups of roller ways are greater than the predicted length of the steel plate, and the finishing mill controller 22 automatically selects the lengths of the front working roll and the front 2 groups of roller ways to automatically control.
And S7, the finishing mill controller 22 sets the roller ways in groups according to the program flow, and sends a control instruction to the corresponding frequency conversion device to finish the rolling of the current pass.
S8, after the rolling of the current pass is finished, the finishing mill controller 22 judges whether the current pass reaches the last pass, if not, the step S2 is executed; if the present pass reaches the last pass, the process proceeds to step S9.
And S9, if the rolling is finished, the finishing mill controller 22 starts all the roller ways behind the mill and conveys the rolled steel plate to the post-process.
Through the control flow, the finishing mill controller 22 can calculate the length of the steel plate after the rolling of the current pass is completed in advance, and automatically group-control the finishing mill roller ways according to the calculated length of the steel plate, so that the purposes of automatic grouping and automatic commissioning of the roller ways are achieved, the utilization efficiency of the roller ways is effectively improved, and the energy-saving effect is achieved.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (6)
1. The utility model provides a heavy and medium plate mill roll table economize on electricity control system which characterized in that: the automatic rolling machine comprises a finishing mill body and a finishing mill controller, wherein a front working roller way and a front roller way group are arranged at the front end of the finishing mill, and a rear working roller way and a rear roller way group are arranged at the rear end of the finishing mill;
the finishing mill body comprises an upper roll system and a lower roll system, the upper roll system is connected with an upper roll system pressing motor, the upper roll system pressing motor is driven by a rolling mill pressing motor frequency converter, and the rolling mill pressing motor frequency converter is controlled by a finishing mill controller;
the machine front working roller way, the machine front roller way group, the machine rear working roller way and the machine rear roller way group are respectively driven by a machine front working roller way driving motor, a machine front roller way group driving motor, a machine rear working roller way driving motor and a machine rear roller way group driving motor; the machine front working roller way driving motor, the machine front roller way group driving motor, the machine rear working roller way driving motor and the machine rear roller way group driving motor are respectively driven by a machine front working roller way frequency converter, a machine front roller way group frequency converter, a machine rear working roller way frequency converter and a machine rear roller way group frequency converter which are controlled by a finish rolling machine controller.
2. The power-saving control system for the roller way of the heavy and medium plate mill according to claim 1, characterized in that: the upper roll system comprises an upper rolling working roll and an upper support; the lower roll system comprises a lower rolling working roll and a lower support.
3. The power-saving control system for the roller way of the heavy and medium plate mill according to claim 2, characterized in that: the rolling mill further comprises a pressing displacement sensor used for measuring the roll gap value between the upper rolling working roll and the lower rolling working roll, and the pressing displacement sensor is arranged on the finishing mill body and connected with the finishing mill controller.
4. The power-saving control system for the roller way of the heavy and medium plate mill according to claim 2, characterized in that: the upper rolling working roll and the lower rolling working roll are connected with corresponding main machine motors; the main motor is driven by the main transmission system; and the finishing mill controller sends a control command to the main transmission system to drive the main motor and drive the upper rolling working roll and the lower rolling working roll to move forwards or backwards.
5. A roller way electricity-saving control method for a heavy and medium plate mill is characterized by comprising the following steps: the method comprises the following steps:
s1: the finishing mill is ready for rolling, a finishing mill controller starts a front roller way set of the machine, and a steel plate to be rolled is conveyed to a front working roller way of the machine;
s2: the finish rolling machine controller sends a reduction control instruction to an upper roll system according to a roll gap set value of the rolling model; the pressing displacement sensor feeds back the actual roll gap value of the finishing mill in real time, and when the deviation between the actual roll gap value of the finishing mill and the set value of the model roll gap is within an allowable range, the finishing mill controller drives the upper roll system to stop pressing and generates a positioning completion signal;
s3: after finishing roll gap positioning is finished, the finishing mill controller calculates the length of a rolled steel plate through a pre-calculation formula of the steel plate to be rolled according to the thickness, the width and the length of the current steel plate raw material to be rolled, the planned width of a rolled finished product and a roll gap value of the finishing mill fed back by the rolling displacement sensor;
s4: the finish rolling mill controller judges the control flow according to the rolling state of the steel plate, and if the rolling direction is rolling in the front-to-back direction, the step S5 is carried out; if the rolling direction is rolling towards the rear part and rolling towards the front part, the step S6 is carried out;
s5: rolling the steel plate in front of the rolling mill and in back of the rolling mill, automatically controlling the back roller ways of the rolling mill in groups by the finish rolling mill controller according to the calculated value of the predicted length of the steel plate and the layout position of the back roller ways of the rolling mill and the principle requirement that the length of the back roller ways of the rolling mill along the rolling center line must be larger than the predicted length of the steel plate; after the finishing mill controller automatically selects the rear roller ways to group, the step S7 is carried out;
s6: rolling towards the rear part of the mill, and automatically controlling the front roller ways in groups by the finish rolling mill controller according to the calculated value of the predicted length of the steel plate and the layout position of the front roller ways and the principle requirement that the length of the front roller ways along the rolling center line is larger than the predicted length of the steel plate; after the finish rolling machine controller automatically selects the front roller ways of the machine to group, performing step S7;
s7: the finishing mill controller sets in groups according to roller ways selected by the program flow, and sends a control instruction to the corresponding frequency conversion device to finish the rolling of the current pass;
s8: after the rolling of the current pass is finished, the finishing mill controller judges whether the current pass reaches the last pass, and if the current pass does not reach the last pass, the step S2 is carried out; if the current pass reaches the last pass, the step S9 is executed;
s9: and if the rolling is finished, the finishing mill controller starts all roller ways behind the machine and conveys the rolled steel plate to the post-process.
6. The electricity-saving control method for the roller way of the heavy and medium plate mill according to claim 5, characterized in that: the precalculated formula of the steel plate to be rolled in step S3 is as follows:
wherein predictedLength is the predicted length, and the unit of the calculation result is millimeter; round () is the calculation formula rounding;
slabthk is the thickness of the raw material; the width of the slabwid is taken as the width of the raw material; slblen is the length of the raw material; alpha is the density of the billet material; beta is the burning loss coefficient of the raw material; χ is the slip coefficient before rolling; delta is a calculated gain factor; f _ h _ hot is a finishing mill roll gap value fed back by the finish rolling reduction displacement sensor; PlanWidth is the planned width of the rolled finished product; epsilon is the density of the finished steel plate; and A is the rolling and steel polishing distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139231.7A CN113909300A (en) | 2021-09-26 | 2021-09-26 | Power-saving control system and method for roller way of medium plate finishing mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111139231.7A CN113909300A (en) | 2021-09-26 | 2021-09-26 | Power-saving control system and method for roller way of medium plate finishing mill |
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| CN113909300A true CN113909300A (en) | 2022-01-11 |
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| CN202111139231.7A Pending CN113909300A (en) | 2021-09-26 | 2021-09-26 | Power-saving control system and method for roller way of medium plate finishing mill |
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| CN (1) | CN113909300A (en) |
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Address after: No.2 Jiangnan Avenue, Jiangnan street, Changshou District, Chongqing 401220 Applicant after: Chongqing Iron & Steel Co.,Ltd. Address before: 401220 No. 1, Gangcheng Road, Changshou District, Chongqing Applicant before: Chongqing Iron & Steel Co.,Ltd. |
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Application publication date: 20220111 |