Energy saving method for large motor empty aisle secondary of plate mill

Abstract

The application discloses a kind of large motor empty pass next energy-saving method of plate mill, it is related to metallurgical technical field.The large motor empty pass next energy-saving method of plate mill, it includes following specific steps, S1: "empty pass next", and enable "empty pass next energy-saving", prepare for specific mill working condition;S2: mill material tracking switches to following large motor speed and goes up large motor given crawling speed, this is in adjusting motor speed control mode, prepares for rolling operation;S3, carries out operation and starts rolling, formally starts rolling operation;S4, mill steel, indicates that rolling process is finished;Wherein, steel plate has 7 passes in rough rolling stage, and has 11 passes in finish rolling stage, the application can be widely used in plate mill project, when mill is in empty pass next, use the empty pass next energy-saving method of the application, achieve the purpose of reducing ton steel power consumption of rolling steel process, play the role of reducing enterprise production cost, improve product competitiveness advantage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgy, in particular to an energy-saving method for large motor empty pass of plate mill. BACKGROUND

[0002] The upper motor and the lower motor drive the roll of the plate mill respectively, and the plate mill is rolled in multiple passes. In the conventional rolling method, when the current pass of the plate mill steel plate pass table is an empty pass, the upper and lower large motors still run at high speed, which cannot achieve good energy-saving effect. The ton steel power consumption of the steel rolling process is high, which becomes a huge problem restricting the production cost of the steel plant. The large motor of the plate mill is a major energy consumer of the steel rolling process, and reasonable control of the energy consumption of the large motor of the plate mill and reduction of the ton steel power consumption are effective ways for the plate steel plant to survive and make a profit. SUMMARY

[0003] The present application aims to at least solve one of the problems in the prior art, and provides an energy-saving method for large motor empty pass of plate mill, which can solve the above problems.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an energy-saving method for large motor empty pass of plate mill, comprising the following specific steps: S1: empty pass, and enabling empty pass energy saving, preparing for a specific mill working state;

[0005] S2: the mill material tracking switches to the following large motor speed, and the upper large motor is given a crawling speed, which is adjusting the motor speed control mode and preparing for rolling operation;

[0006] S3: performing operation and starting rolling, and formally starting rolling operation;

[0007] S4: mill steel throwing, indicating the end of the rolling process;

[0008] Among them, the steel plate has 7 passes in the rough rolling stage and 11 passes in the finishing rolling stage, and the steel plate has a total of 18 passes.

[0009] Preferably, the last pass of the rough rolling stage and the last pass of the finishing rolling stage, i.e. the 7th pass and the 18th pass, are judged according to the condition that the given rolling force F is zero, and the two passes are empty passes and do not produce a reduction amount.

[0010] Preferably, when rolling two passes, the speed of the upper and lower large motors of the mill is energy-saving set: after starting to bite the steel, the lower large motor rolls at the normal given speed from the second mathematical model of the mill, and the maximum can reach 3.11 m / s of the 7th pass and 5.17 m / s of the 18th pass.

[0011] Preferably, the actual speed of the large motor of the rolling mill material tracking system is processed, and the actual average speed of the upper and lower large motors of the non-empty pass is automatically switched to the actual speed of the lower motor.

[0012] Preferably, the upper large motor is rolled at a speed of 0.5 m / s until the current pass is finished, so as to achieve the effect of energy saving.

[0013] Preferably, the material tracking system only uses the actual speed of the lower motor of the rolling mill to perform integral calculation on the position of the steel plate head, so as to achieve the purpose of accurate tracking of the position of the steel plate by the material tracking system, and deviation of the actual position of the steel plate from the position calculated by the material tracking is avoided.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] 1. The large motor empty pass energy saving method of the plate rolling mill, the present application is directed to the case that the current pass of the plate rolling mill steel plate rolling pass table is an empty pass, and accordingly, a "roller mode" of the large motor of the plate horizontal rolling mill is innovated, in which mode, the function of the large motor of the plate rolling mill is like that of a roller, only serving the function of conveying and not the function of rolling, so it is called the "roller mode" of the large motor, at this time, the plate large motor empty pass energy saving method is automatically enabled: only the lower motor is used to convey the steel plate at a high speed, and the upper motor only crawls at a low speed, so as to achieve the purpose of conveying the steel plate and reducing the consumption of electric energy.

[0016] 2. The large motor empty pass energy saving method of the plate rolling mill, the present application can be widely applied in the plate rolling mill project, when the rolling mill is in an empty pass, the empty pass energy saving method of the present application is used to achieve the purpose of reducing the electric energy consumption per ton of steel in the rolling process, and to reduce the production cost of the enterprise and improve the competitive advantage of the product.

[0017] 3. The large motor empty pass energy saving method of the plate rolling mill, the main content of the present application is that when the current pass of the plate rolling mill steel plate rolling pass table is an empty pass, the plate large motor empty pass energy saving method is automatically enabled, and the speed control of the upper and lower large motors is processed for energy saving: only the lower motor is used to convey the steel plate at a high speed, and the upper motor only crawls at a low speed, so as to achieve the purpose of conveying the steel plate and reducing the consumption of electric energy. The present application can be widely applied in the plate rolling mill project, when the rolling mill is in an empty pass, the empty pass energy saving method of the present application is used to achieve the purpose of reducing the electric energy consumption per ton of steel in the rolling process, and to reduce the production cost of the enterprise and improve the competitive advantage of the product. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in combination with the drawings and embodiments:

[0019] Fig. 1 Flow chart of the energy saving method of the empty pass in the present application;

[0020] Fig. 2 Pass table of the medium plate rolling steel plate in the present application;

[0021] Fig. 3 Energy saving speed curve chart of the large motor of the empty pass in the present application. DETAILED DESCRIPTION

[0022] This part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with figures, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as the limitation of the protection scope of the present application.

[0023] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as the limitation of the present application.

[0024] In the description of the present application, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0025] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0026] Please refer to Figs. 1-3 The present application provides a technical scheme: an energy saving method of the large motor of the medium plate rolling mill, which comprises the following specific steps: S1: empty pass, and enabling the energy saving of the empty pass, preparing for the specific rolling mill working state.

[0027] S2: the rolling mill material tracking switches to the following large motor speed, and the large motor is given a crawling speed, which is to adjust the motor speed control mode and prepare for the rolling operation;

[0028] S3, operation and start rolling, formally start rolling operation;

[0029] S4, the mill is thrown, indicating the end of the rolling process;

[0030] Wherein, the steel plate has 7 passes in the rough rolling stage, and 11 passes in the finishing rolling stage, and the steel plate has a total of 18 passes.

[0031] Wherein, the last pass of the rough rolling stage and the last pass of the finishing rolling stage, i.e. the 7th pass and the 18th pass, are judged according to the condition that the given rolling force "F" is zero, and the two passes are empty passes and do not produce the reduction amount.

[0032] Wherein, when the two passes are rolled, the speed of the upper and lower large motors of the rolling mill is set to save energy: after starting to bite the steel, the lower large motor is rolled at the normal given speed from the second mathematical model of the rolling mill, and the maximum speed can reach 3.11 m / s in the 7th pass and 5.17 m / s in the 18th pass, while the upper large motor is rolled at a speed of 0.5 m / s until the current pass is finished, so as to achieve the effect of saving energy.

[0033] Wherein, the actual speed of the large motor sent to the rolling mill material tracking system is processed, and the actual average speed of the upper and lower large motors in the non-empty pass is automatically switched to the actual speed of the lower motor. At this time, the material tracking system only uses the actual speed of the lower motor of the rolling mill to perform integral calculation on the position of the steel plate head, so as to achieve the purpose of accurate tracking of the position of the steel plate by the material tracking system, and to avoid deviation of the actual position of the steel plate from the position calculated by the material tracking.

[0034] Fig. 3 In the figure, 1 represents the given speed curve of the lower large motor, and 2 represents the given speed curve of the upper large motor.

[0035] Example one, the discrimination of the empty pass of the plate mill:

[0036] The plate rolling pass table is automatically calculated by the mathematical model of the rolling mill secondary process automation system according to the factors such as steel grade, original size, contract size, temperature, etc. Each pass in the pass table involves changes in target thickness, reduction rate, rolling speed, tension and other parameters of the rolled piece. The accuracy of these parameters directly affects the quality and yield of the final product. After the pass table is calculated, the rolling mill secondary process automation system sends it to the rolling mill primary basic automation system, which executes it according to the set value. In order to meet the stage temperature requirement or product thickness requirement in the rolling process, the rolling mill secondary mathematical model usually calculates the empty pass to accurately control the thickness and temperature of the rolled piece.

[0037] When the first level basis automation system of the plate mill receives the pass schedule from the second level process automation, the patent application can judge according to the given rolling force of the current pass, if the given rolling force is zero, it is considered that the pass is an empty pass, the plate mill only plays the role of plate transmission, and no substantial mechanical deformation occurs.

[0038] Example two, setting of the given speed of the large motor of the plate mill in the empty pass:

[0039] The significant feature when the current pass is an empty pass is that the roll gap of the plate mill is greater than a certain set value, usually the value is set to 50-80 mm, than the current pass thickness of the plate, at the same time, the given rolling force of the current pass is zero, the plate mill will not produce the reduction amount, only the plate is transported from the inlet to the outlet of the plate mill or from the outlet to the inlet of the plate mill, at this time, the patent application automatically enables the energy saving method of the large motor of the plate mill in the empty pass, and the speed given of the upper and lower large motors of the plate mill is processed differently, without affecting the transport speed of the current empty pass plate, since the lower roll of the plate mill needs to be responsible for the transmission of the plate, the speed given of the lower roll of the plate mill is still executed according to the given speed calculated by the second level mathematical model of the plate mill; and the upper roll of the plate mill does not need to contact the plate, so it runs at a fixed set speed, such as 0.5 m / s, from the start of the plate mill to the end of the current pass.

[0040] Example three, solving the influence of the energy saving of the plate mill in the empty pass on the tracking of the rolled material:

[0041] In the traditional plate material tracking system, when the plate mill rack contains steel (or "steel in the rack"), the plate material tracking system uses the average actual speed of the upper and lower large motors of the plate mill to perform integral calculation on the head position of the plate, in the conventional empty pass of the plate mill, the speed given of the upper and lower large motors of the plate mill is consistent, if the differentiated speed control of the large motor is used in the empty pass of the plate mill, and the speed parameter used by the material tracking system is not processed, the position of the plate material tracking will be wrong, which will affect the sequence control of the subsequent plate process, and seriously, it will cause the collision or stacking of the plates on the rolling line, causing a major equipment accident.

[0042] Therefore, the patent application automatically switches the speed parameter used by the material tracking system when the large motor of the plate mill in the empty pass is energy-saving, at this time, the material tracking system only uses the actual speed of the lower motor of the plate mill to perform integral calculation on the head position of the plate, to achieve the purpose of accurate tracking of the position of the plate by the material tracking system.

[0043] Further, the present application is directed to the case when the current pass of the plate rolling pass schedule of the plate mill is a skip pass, and accordingly, a "roller mode" of the large motor of the plate mill is innovated, in which mode, the function of the large motor of the plate mill is just like a roller, only serving the function of conveying, not the function of rolling, so we call it the "roller mode" of the large motor, at this time, the energy-saving method of the plate mill skip pass is automatically enabled: only the lower motor is used to convey the plate at a high speed, and the upper motor only crawls at a low speed, so as to achieve the purpose of conveying the plate and reducing the power consumption.

[0044] The present application can be widely applied in the plate mill project, when the mill is in a skip pass, the energy-saving method of the skip pass of the present application is used, the purpose of reducing the power consumption per ton of steel in the rolling process is achieved, the production cost of the enterprise is reduced, and the product competitiveness is improved.

[0045] Further, the main content of the present application is that when the current pass of the plate rolling pass schedule of the plate mill is a skip pass, the energy-saving method of the plate mill skip pass is automatically enabled, and the speed control of the upper and lower large motors is energy-saving processed: only the lower motor is used to convey the plate at a high speed, and the upper motor only crawls at a low speed, so as to achieve the purpose of conveying the plate and reducing the power consumption. The present application can be widely applied in the plate mill project, when the mill is in a skip pass, the energy-saving method of the skip pass of the present application is used, the purpose of reducing the power consumption per ton of steel in the rolling process is achieved, the production cost of the enterprise is reduced, and the product competitiveness is improved.

[0046] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A method for energy saving in the empty passage of a large motor in a medium-thick plate rolling mill, characterized in that: The specific steps include the following: S1: Activate "Energy Saving in Empty Passage" to prepare for specific mill operating conditions; The steel plate has 7 passes in the rough rolling stage and 11 passes in the finish rolling stage, for a total of 18 passes. The last pass of the roughing stage and the last pass of the finishing stage, namely the 7th and 18th passes, are considered as empty passes and will not produce any reduction, based on the condition that the given rolling force "F" is zero. When rolling empty passes, energy-saving settings are made for the speeds of the upper and lower main motors of the rolling mill: after the steel biting is started, the lower main motor rolls at the normal given speed from the secondary mathematical model of the rolling mill, with a maximum speed of 3.11 m / s for the 7th pass and a maximum speed of 5.17 m / s for the 18th pass. All large motors roll at a speed of 0.5 m / s until the empty pass is finished, in order to achieve energy saving. S2: Adjust the motor speed control mode to prepare for the rolling operation; The mill material tracking system processes the actual speed of the large motors and automatically switches from the actual average speed of the upper and lower large motors during non-empty passages to the actual speed of the lower motor. The material tracking system uses only the actual speed of the large motor under the rolling mill to perform integral calculation on the position of the steel plate head, so as to achieve the purpose of the material tracking system to accurately track the position of the steel plate, without causing the actual position of the steel plate to deviate from the position calculated by the material tracking integral. S3, perform calculations and start rolling, officially commencing the rolling operation; S4, rolling mill throws out steel, indicating the end of the rolling process.

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