CN109940048B - Tension control method for leveling and uncoiling unit - Google Patents

Tension control method for leveling and uncoiling unit Download PDF

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CN109940048B
CN109940048B CN201910273215.3A CN201910273215A CN109940048B CN 109940048 B CN109940048 B CN 109940048B CN 201910273215 A CN201910273215 A CN 201910273215A CN 109940048 B CN109940048 B CN 109940048B
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tension
threading
leveling
uncoiler
setting
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CN109940048A (en
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程鹏
张弘
张世友
王强
范卫锋
王伟
曹开翔
丁红菲
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Phima Intelligence Technology Co ltd
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Feima Zhike Information Technology Co ltd
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Abstract

The invention discloses a tension control method of a leveling and coil-separating unit, which has two working modes of rewinding and leveling. The tension control method realizes the stable and controllable tension of the unit in the threading and running processes, avoids the problems of large strip steel shaking, easy scratching and the like, and provides powerful support for realizing the automatic threading and improving the automation rate of the unit and improving the product quality and success rate of the hot rolled strip steel.

Description

Tension control method for leveling and uncoiling unit
Technical Field
The invention relates to the technical field of metallurgy automatic control, in particular to a tension control technology of a hot rolling leveling and coil splitting unit.
Background
The hot rolling leveling coil splitting machine set is an important production process for improving the strip shape quality and the mechanical property of strip steel. The tension control of the unit tensions loose strip steel to ensure the stable transmission of the strip steel in the production line, and the control method and the control precision of the tension control directly influence the production efficiency, the product quality and the yield of the production line, and are one of the key control technologies of the production line. With the continuous development of hot rolling technology, the strength grade of high-strength steel is gradually improved, the requirement of the market on the quality of hot-rolled sheet strips is higher and higher, the capacity of a hot-rolling flattening unit which is conventionally provided with an inlet straightener and a flattening machine for processing the high-strength steel is obviously insufficient, and a hot-rolling flattening coil inspection line based on the hot-rolling flattening unit is lacked.
Disclosure of Invention
The invention aims to solve the technical problem of realizing a tension control method, fully considering the adverse factors of the unit on tension control caused by the fact that a production line is lengthened due to the fact that a powerful straightening machine is arranged on the unit, realizing the stable and controllable tension of the unit in the automatic threading and running processes, avoiding the problems that the strip steel is easy to shake greatly and scratch and the like after the production line is lengthened, and ensuring the high-speed stable running of a hot rolling leveling unit.
In order to achieve the purpose, the invention adopts the technical scheme that: a tension control method for a leveling and uncoiling unit comprises the following steps:
1) when threading, setting the uncoiler to be in a speed control mode;
2) when the strip head passes through the inlet pinch roll, setting the uncoiler into a tension control mode, wherein the set value is first strip threading tension;
3) after the tape head penetrates into a jaw of a mandrel of a coiling machine, the tape threading is suspended;
4) after a mandrel of the recoiling machine expands and clamps the head of the strip steel, switching the uncoiling machine from a tension control mode to a speed control mode and serving as a main production line speed roller, setting the recoiling machine to be in the tension control mode, and setting the tension of the recoiling machine to be a second threading tension;
5) after the threading tension of the coiler is established, the production line continues to run at the threading speed;
6) when the coiling head of the coiler reaches the set number of turns, switching the coiler from a tension control mode to a speed control mode and to a production line main speed roller, simultaneously switching the uncoiler from the speed control mode to the tension control mode, and setting the speed as a normal operation value;
7) and when the actual tension of the uncoiler reaches the set value of the normal production tension, the production line is accelerated to enter a normal running state.
The leveling mode tension control method comprises the following steps:
a) when a strip head passes through an inlet pinch roll during strip threading, setting an uncoiler to be in a tension control mode, wherein the set value is first strip threading tension;
b) after the tape head penetrates into a jaw of a mandrel of a coiling machine, the tape threading is suspended;
c) after a mandrel of a coiling machine expands and clamps the head of the strip steel, setting a temper mill as a main speed roller of a production line, and putting the temper mill in a minimum rolling force mode;
d) when the temper mill reaches the minimum rolling force, setting the tension set value of the uncoiler as a first threading tension, setting the coiler as a tension control mode, and setting the tension of the coiler as a second threading tension;
e) after the uncoiler and the coiler reach the set tension, the production line continues to run at the threading speed;
f) after the coiling head of the coiling machine reaches the set number of turns, putting the temper mill into a normal production mode, and setting the tension of the uncoiler and the coiling machine as the normal production tension;
g) and when the actual tension of the uncoiler and the coiler reaches the set value of the normal production tension, the production line is accelerated to enter a normal running state.
The first threading tension is 5-10% of the set value of the normal tension, the second threading tension is 30% of the set value of the normal tension, and the set number of turns is more than two turns.
The minimum rolling force is 450-550 KN.
A leveling and uncoiling unit adopts the tension control method of the leveling and uncoiling unit.
The leveling and uncoiling unit is sequentially provided with an uncoiler, an inlet pinch roll, an inlet straightener, a leveler, an outlet powerful straightener, an outlet shear, a tension pinch roll and a coiler along the conveying sequence of the steel strip.
The leveling and splitting unit is provided with a PLC controller, and the PLC controller controls equipment of the leveling and splitting unit.
The tension control method realizes the stable and controllable tension of the unit in the threading and running processes, avoids the problems of large strip steel shaking, easy scratching and the like, and provides powerful support for realizing the automatic threading and improving the automation rate of the unit and improving the product quality and success rate of the hot rolled strip steel.
Drawings
The following is a brief description of the contents of each figure in the description of the present invention:
FIG. 1 is a flow chart of a method for controlling the tension of a hot rolling leveling coil separator in a recoiling mode;
FIG. 2 is a flow chart of a tension control method in a leveling mode of a hot rolling leveling coil separator;
FIG. 3 is a schematic diagram of a hot rolling leveling decoiler.
Detailed Description
The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.
A tension control method is characterized in that a tension control strategy of a refined production line is tracked through strip steel in the automatic threading and running processes, and technologies such as main speed and tension control dynamic switching are adopted, so that the tension of a unit is stable and controllable in the automatic threading and running processes, the problems of large strip steel shaking, easiness in scratching and the like are solved, and powerful support is provided for realizing automatic threading of the unit, improving the automation rate and improving the product quality and success rate of hot-rolled strip steel.
The hot rolling temper mill has two working modes of rewinding and temper rolling, and the tension control method is shown in figures 1 and 2 and comprises the following steps:
rewinding mode tension control method:
when threading, when the strip head passes through the inlet pinch roll, the uncoiler is set to be in a tension control mode, the set value is strip threading tension which is 5-10% (fine adjustment) of the set value of normal tension, the strip steel is conveyed forwards together with equipment such as the inlet pinch roll on the wire, when the strip head passes through a jaw of a mandrel of the coiler, the strip threading is suspended (the speed is 0), after the mandrel of the coiler expands and clamps the head of the strip steel, the uncoiler is switched to be in a speed control mode from the tension control mode and is a main speed roll of a production line; the winder was set to tension control mode with the tension set to threading tension, 30% of the normal tension set (fine adjustable). After the setting is finished and the threading tension of the coiler is established, the production line continues to run at the threading speed of 15m/min (which can be set), when the coiler winds 2 turns of the strip head (which can be finely adjusted), the coiler is switched from the tension control mode to the speed control mode and is a main speed roller of the production line, and meanwhile, the uncoiler is switched from the speed control mode to the tension control mode and is set as a normal running value. And when the actual tension of the uncoiler reaches the set value of the normal production tension, the production line is accelerated to enter a normal running state.
The leveling mode tension control method comprises the following steps:
when threading, when the strip head passes through an inlet pinch roll, an uncoiler is set to be in a tension control mode, the set value is strip threading tension which is 5-10 percent (fine adjustment) of the set value of normal tension, the strip steel is conveyed forwards together with equipment such as an inlet pinch roll on a line, when the strip head passes through a jaw of a mandrel of a coiling machine, the strip threading is suspended (the speed is 0), after the mandrel of the coiling machine expands and clamps the head of the strip steel, the temper mill is set to be a main speed roll of the production line and is put in a minimum rolling force (500KN, settable) mode, and when the temper mill reaches the minimum rolling force, the set value of the tension of the uncoiler is set to be 5-10 percent (fine adjustment) of the set value; the winder was set to tension control mode with the tension set to threading tension, 30% of the normal tension set (fine adjustable). After the setting is finished and the uncoiler and the coiler both reach the set tension, the production line continues to run at the threading speed of 15m/min (which can be set), and after the coiler coils 2 coils of the strip head (which can be finely adjusted), the temper mill is put into a normal production mode; the tension of the uncoiler and the coiler is set to the normal production tension. And when the actual tension of the uncoiler and the coiler reaches the set value of the normal production tension, the production line is accelerated to enter a normal running state.
The hot rolling leveling and coil splitting unit can realize the tension control function of the hot rolling leveling and coil splitting unit by converting a programming language of a hardware platform such as a PLC (programmable logic controller) and the like into a control program, and the aim of controlling the tension stability of the hot rolling leveling and coil splitting unit in the threading and running processes is fulfilled. The invention has been successfully applied to SimATIC S7-400PLC hardware platform of Siemens, and has expected effect on engineering projects such as hot rolling leveling and coil splitting machine set and the like.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.

Claims (7)

1. A tension control method for a leveling and coiling machine set is characterized by comprising the following steps: the method comprises a rewinding mode tension control method and comprises the following steps:
1) when threading, setting the uncoiler to be in a speed control mode;
2) when the strip head passes through the inlet pinch roll, setting the uncoiler into a tension control mode, wherein the set value is first strip threading tension;
3) after the tape head penetrates into a jaw of a mandrel of a coiling machine, the tape threading is suspended;
4) after a mandrel of the recoiling machine expands and clamps the head of the strip steel, switching the uncoiling machine from a tension control mode to a speed control mode and serving as a main production line speed roller, setting the recoiling machine to be in the tension control mode, and setting the tension of the recoiling machine to be a second threading tension;
5) after the threading tension of the coiler is established, the production line continues to run at the threading speed;
6) when the coiling head of the coiler reaches the set number of turns, switching the coiler from a tension control mode to a speed control mode and to a production line main speed roller, simultaneously switching the uncoiler from the speed control mode to the tension control mode, and setting the speed as a normal operation value;
7) and when the actual tension of the uncoiler reaches the set value of the normal production tension, the production line is accelerated to enter a normal running state.
2. The tension control method of the leveling and uncoiling unit as claimed in claim 1, wherein: the method also comprises a tension control method in a leveling mode, and comprises the following steps:
a) when a strip head passes through an inlet pinch roll during strip threading, setting an uncoiler to be in a tension control mode, wherein the set value is first strip threading tension;
b) after the tape head penetrates into a jaw of a mandrel of a coiling machine, the tape threading is suspended;
c) after a mandrel of a coiling machine expands and clamps the head of the strip steel, setting a temper mill as a main speed roller of a production line, and putting the temper mill in a minimum rolling force mode;
d) when the temper mill reaches the minimum rolling force, setting the tension set value of the uncoiler as a first threading tension, setting the coiler as a tension control mode, and setting the tension of the coiler as a second threading tension;
e) after the uncoiler and the coiler reach the set tension, the production line continues to run at the threading speed;
f) after the coiling head of the coiling machine reaches the set number of turns, putting the temper mill into a normal production mode, and setting the tension of the uncoiler and the coiling machine as the normal production tension;
g) and when the actual tension of the uncoiler and the coiler reaches the set value of the normal production tension, the production line is accelerated to enter a normal running state.
3. The tension control method of the leveling and uncoiling unit according to claim 1 or 2, characterized in that: the first threading tension is 5-10% of the set value of the normal tension, the second threading tension is 30% of the set value of the normal tension, and the set number of turns is more than two turns.
4. The tension control method of the leveling and uncoiling unit as claimed in claim 2, wherein: the minimum rolling force is 450-550 KN.
5. The utility model provides a level bundling unit which characterized in that: the leveling and uncoiling unit adopts the tension control method of the leveling and uncoiling unit as claimed in any one of claims 1 to 4.
6. The temper rolling mill as claimed in claim 5, wherein: the leveling and uncoiling unit is sequentially provided with an uncoiler, an inlet pinch roll, an inlet straightener, a leveler, an outlet powerful straightener, an outlet shear, a tension pinch roll and a coiler along the conveying sequence of the steel strip.
7. The temper rolling mill as claimed in claim 5 or 6, wherein: the leveling and splitting unit is provided with a PLC controller, and the PLC controller controls equipment of the leveling and splitting unit.
CN201910273215.3A 2019-04-04 2019-04-04 Tension control method for leveling and uncoiling unit Active CN109940048B (en)

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CN112222202B (en) * 2019-06-30 2022-11-18 宝山钢铁股份有限公司 Control method for tension switching of strip steel welding line over-leveling equipment
CN110314939B (en) * 2019-07-15 2020-12-01 张家港宏昌钢板有限公司 Strip steel head flattening method by utilizing flattening unit
CN111633036A (en) * 2020-06-09 2020-09-08 攀钢集团攀枝花钢钒有限公司 Method for reducing local narrowing during tension building of hot continuous rolling coiler

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KR100805048B1 (en) * 2002-05-07 2008-02-20 주식회사 포스코 Reel tension and speed control method of skim pass mill for improving surface scar of coil
CN102125936B (en) * 2010-01-12 2012-12-12 宝山钢铁股份有限公司 Method for controlling hot rolling coiling tension
KR101376513B1 (en) * 2011-12-12 2014-03-21 현대로템 주식회사 The skin pass mill system has precise tension control
CN103372583B (en) * 2012-04-28 2015-06-17 宝山钢铁股份有限公司 Control method of hot rolling coiling tension
CN204583915U (en) * 2015-04-28 2015-08-26 中冶赛迪工程技术股份有限公司 Hot-strip skin pass mill
CN106391723B (en) * 2016-10-28 2018-05-04 鞍钢未来钢铁研究院有限公司 The double coiling speeds of cold continuous rolling switch and build Zhang Fangfa

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Address after: No. 999, Huolishan Avenue, Yushan District, Ma'anshan, Anhui Province, 243000

Patentee after: Phima Intelligence Technology Co.,Ltd.

Address before: 243000 floor 1, building 5, no.6, south section of huolishan Avenue, Yushan District, Ma'anshan City, Anhui Province

Patentee before: FEIMA ZHIKE INFORMATION TECHNOLOGY Co.,Ltd.