An automatic starting control system for solving starting marks of an aluminum cold rolling mill and an application method thereof

Abstract

The application provides an automatic starting control system and application method for solving starting marks of an aluminum cold rolling mill, comprising an uncoiler, a deflector roller, a shape roller, a coiler, an outlet grating, an inlet grating, an upper rolling roller and a lower rolling roller; a hydraulic cylinder for driving the lower rolling roller to move in a vertical direction is arranged below the lower rolling roller; a displacement sensor is arranged in the hydraulic cylinder; a hydraulic system is further arranged, the hydraulic system drives the hydraulic cylinder to move, the hydraulic system comprises a first pressure sensor and a second pressure sensor; the first pressure sensor is arranged on an operation side of the hydraulic system, and the second pressure sensor is arranged on a transmission side of the hydraulic system; the technical scheme can avoid the generation of starting marks, and each step is pre-fixed and solidified in a program, so that an operator only needs to press an automatic starting button, and the aluminum cold rolling mill can automatically start production according to the pre-fixed steps, thereby avoiding quality problems caused by improper human operation.

Description

Technical Field

[0001] This invention relates to the field of aluminum cold rolling mill technology, and in particular to an automatic starting control system and application method for solving the problem of starting marks on aluminum cold rolling mills. Background Technology

[0002] When the aluminum cold rolling mill starts rolling, if the rolls are stationary when the strip contacts the rolls, contact marks are easily formed on the rolls at the moment of contact. During the rolling process, these marks will periodically imprint on the surface of the strip, creating starting marks. For products requiring high surface quality, this will not meet delivery requirements. Therefore, the starting control method is very demanding, which requires a high level of operator skill. However, due to the lack of experience of some operators and the varying skill levels among them, starting mark defects still occur from time to time, leading to product defects. This affects the stability of product quality, and the rolls with starting marks cannot be used and need to be re-ground. The strips also cannot meet delivery requirements, resulting in increased costs and reduced production efficiency. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide an automatic start-up control system and application method for solving the problem of start-up marks in aluminum cold rolling mills. This system avoids the generation of start-up marks and pre-programs each step. The operator only needs to press the automatic start-up button, and the aluminum cold rolling mill will automatically start production according to the pre-programmed steps, thus avoiding quality problems caused by improper human operation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an automatic starting control system for solving the problem of starting marks on aluminum cold rolling mills, comprising an uncoiler, a guide roll, a sheet roll, a coiler, an exit grating, an entrance grating, an upper roll, and a lower roll; first bearings are respectively arranged on both sides of the upper roll, and second bearings are respectively arranged on both sides of the lower roll; a hydraulic cylinder for driving the lower roll to move vertically is arranged below the second bearing; a displacement sensor is arranged inside the hydraulic cylinder, and the distance between the upper roll and the lower roll, i.e., the roll gap value h, is calculated by measuring the stroke of the hydraulic cylinder through the displacement sensor; the system also includes a hydraulic system that drives the hydraulic cylinder to move, and the hydraulic system includes a first pressure sensor and a second pressure sensor; the first pressure sensor is arranged on the operating side of the hydraulic system, and the second pressure sensor is arranged on the transmission side of the hydraulic system;

[0005] It also includes rolled strip and a main machine; the main machine is connected to a gearbox, and the two shafts output by the gearbox are respectively connected to the universal coupling of the upper roll and the universal coupling of the lower roll; the rotation of the main machine drives the upper roll and the lower roll to rotate simultaneously; the main machine is equipped with an encoder, which measures the motor speed and then calculates the linear velocity V of the upper roll and the lower roll; spray bar beams are installed on the inlet side of the upper roll and the lower roll, and rolling oil is sprayed through the spray bar beams to lubricate the strip and the roll.

[0006] In a preferred embodiment, the system further includes a PLC program controller, a nozzle controller, a first servo valve controller, and a second servo valve controller, wherein the first and second servo valve controllers control the operating side and the transmission side of the hydraulic system, respectively; the deflector roller, the flat roller, the uncoiler, the main machine, and the winding machine are each connected to an encoder; the deflector roller, the flat roller, the PLC program controller, the uncoiler, the main machine, and the winding machine are sequentially connected and transmit signals via DP communication; the first pressure sensor, the second pressure sensor, the nozzle controller, the inlet grating, the outlet grating, the first servo valve controller, and the second servo valve controller are all connected to the PLC program controller.

[0007] In a preferred embodiment, the system further includes a first displacement sensor disposed on the operating side of the hydraulic system and a second displacement sensor disposed on the transmission side of the hydraulic system; the first displacement sensor is connected to the PLC program controller via a first MD20B module, and the second displacement sensor is connected to the PLC program controller via a second MD20B module.

[0008] This invention also provides an application method for an automatic starting control system for solving the problem of machining marks on aluminum cold rolling mills. The method employs the aforementioned automatic starting control system for solving the problem of machining marks on aluminum cold rolling mills and includes the following steps:

[0009] Step S1: The conditions for starting the aluminum cold rolling mill are met, and the operator presses the "automatic start" button;

[0010] Step S2: Given the target roll gap value h1, h1 = inlet strip thickness H + 5mm;

[0011] Step S3: The hydraulic cylinder starts to drive the lower roll to move upward, and the spray bar beam starts to spray oil for lubrication at the same time;

[0012] Step S4: When the displacement sensor detects a value h=h1, the hydraulic cylinder stops moving upward, and the host machine starts to drive the upper and lower rolls to rotate with a target linear speed of 3m / min.

[0013] Step S5: When the roll linear speed V = 3m / min, the hydraulic cylinder continues to move upward until the first pressure sensor and the second pressure sensor detect a pressure greater than 250 tons. At this time, it means that the roll has pressed against the strip.

[0014] Step S6: The uncoiler and coiler automatically establish tension, and the main unit sets the target linear speed to 15m / min;

[0015] Step S7: When the roll linear speed V = 15 m / min, the automatic start-up control is completed, and the strip rolling begins.

[0016] Compared with existing technologies, the present invention has the following advantages: By appropriately controlling each step of the aluminum cold rolling mill start-up process and pre-programming each step, the operator only needs to press the "automatic start" button to complete a one-button start-up, avoiding quality problems caused by improper human operation. Practical experience has proven that this control method effectively solves the problem of start-up marks and has been well applied in the field. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the vehicle start-up control according to a preferred embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the electrical signal of a preferred embodiment of the present invention;

[0019] Figure 3 This is a control program step diagram of a preferred embodiment of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application; as used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise; furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] An application method for an automatic starting control system to solve the problem of machining marks on aluminum cold rolling mills, wherein an automatic starting control system for solving the problem of machining marks on aluminum cold rolling mills is adopted, such as... Figure 1As shown, the assembly includes an uncoiler, a guide roll, a sheet roll, a coiler, an exit grating, an entrance grating, an upper roll 11, and a lower roll 12. First bearings 13 are respectively installed on both sides of the upper roll, and second bearings are respectively installed on both sides of the lower roll 12. A hydraulic cylinder 14 for driving the lower roll to move vertically is installed below the second bearings. A displacement sensor 15 is installed inside the hydraulic cylinder. The displacement sensor 15 measures the stroke of the hydraulic cylinder 14 and then calculates the distance between the upper roll 11 and the lower roll 12, i.e., the roll gap value h. The assembly also includes a hydraulic system 20. The hydraulic system 20 drives the hydraulic cylinder 14 to move. The hydraulic system 20 includes a first pressure sensor 21 and a second pressure sensor. The first pressure sensor 21 is located on the operating side of the hydraulic system 20, and the second pressure sensor is located on the transmission side of the hydraulic system 20. The pressure of the hydraulic cylinder 14 can be detected by the first pressure sensor 21 and the second pressure sensor to determine whether the roll is pressing against the strip 16. According to field use, when the roll presses against the strip 16, the combined pressure of the first pressure sensor 21 and the second pressure sensor will be greater than 250 tons.

[0024] It also includes a rolled strip 16 and a main machine 17; the main machine 17 is connected to a reduction gearbox 18, and the two shafts output by the reduction gearbox 18 are respectively connected to the first universal coupling 19 of the upper roll 11 and the second universal coupling of the lower roll 12. The roll diameters of the upper roll 11 and the lower roll 12 are close, so the linear velocities of the upper roll 11 and the lower roll 12 can be considered to be the same; the rotation of the main machine 17 simultaneously drives the upper roll 11 and the lower roll 12 to rotate; the main machine 17 is equipped with an encoder, which measures the motor speed and then calculates the linear velocity V of the upper roll 11 and the lower roll 12; spray bar beams are installed on the inlet side of the upper roll 11 and the lower roll 12, and rolling oil is sprayed through the spray bar beams to lubricate the strip and the rolls.

[0025] It also includes a PLC program controller, a nozzle controller, a first servo valve controller, and a second servo valve controller. The first and second servo valve controllers control the operating side and the transmission side of the hydraulic system 20, respectively. To make the movement of the hydraulic cylinder 14 more precise, the valve driving the hydraulic cylinder 14 to rise and fall is a servo valve, with one on the transmission side and one on the operating side. The guide roller, the flat roller, the uncoiler, the main machine, and the winding machine are each connected to an encoder. The guide roller, the flat roller, the PLC program controller, the uncoiler, the main machine, and the winding machine are connected in sequence and transmit signals through DP communication. The first pressure sensor 21, the second pressure sensor, the nozzle controller, the inlet grating, the outlet grating, the first servo valve controller, and the second servo valve controller are all connected to the PLC program controller.

[0026] It also includes a first displacement sensor disposed on the operating side of the hydraulic system 20 and a second displacement sensor disposed on the transmission side of the hydraulic system; the first displacement sensor is connected to the PLC program controller through a first MD20B module, and the second displacement sensor is connected to the PLC program controller through a second MD20B module.

[0027] The electrical signal schematic diagram of this embodiment is as follows: Figure 2 As shown, the PLC controller used for programming is a Siemens S7-400 controller. Each encoder signal is connected to its respective drive control unit, and then the drive unit transmits the signal to the PLC program controller via DP communication. The signals from the pressure sensor, nozzle control, inlet grating, outlet grating, and servo valve controller are directly connected to the PLC program controller. The signals from the drive-side displacement sensor and the operating-side displacement sensor are first connected to the MD20B module, and then the module transmits the signal to the PLC controller via fiber optic communication, thus shortening the signal transmission time.

[0028] This invention also provides an application method for an automatic starting control system for solving the problem of machining marks on aluminum cold rolling mills. The method employs the aforementioned automatic starting control system for solving machining marks on aluminum cold rolling mills, with reference to... Figure 3 This includes the following steps:

[0029] Step S1: The conditions for starting the aluminum cold rolling mill are met, and the operator presses the "automatic start" button;

[0030] Step S2: Given the target roll gap value h1, h1 = inlet strip thickness H + 5mm;

[0031] Step S3: The hydraulic cylinder starts to drive the lower roll to move upward, and the spray bar beam starts to spray oil for lubrication at the same time;

[0032] Step S4: When the first displacement sensor and the second displacement sensor detect the value h=h1, the hydraulic cylinder stops moving upward, and the host machine starts to drive the upper and lower rolls to rotate with a target linear speed of 3m / min.

[0033] Step S5: When the roll linear speed V = 3m / min, the hydraulic cylinder continues to move upward until the first pressure sensor and the second pressure sensor detect a pressure greater than 250 tons. At this time, it means that the roll has pressed against the strip.

[0034] Step S6: The uncoiler and coiler automatically establish tension, and the main unit sets the target linear speed to 15m / min;

[0035] Step S7: When the roll linear speed V = 15 m / min, the automatic start-up control is completed, and the strip rolling begins.

[0036] To avoid inefficient manual operation and increased workload, this embodiment implements automatic control through programming and embeds it in the program. The operator only needs to press the "Automatic Start" button, and the aluminum cold rolling mill will automatically start according to the above steps, requiring no manual intervention, thus reducing workload and saving time. To prevent accidental button presses, this embodiment requires that automatic start be initiated only under certain conditions. These conditions include:

[0037] The host operating conditions are met and it is in a stopped state;

[0038] The uncoiler and coiler are operating under the same conditions and are in a stopped state;

[0039] The operating conditions for the plate roll and the guide roll are met and they are in a stopped state;

[0040] The hydraulic system is operating normally;

[0041] The nozzle system is functioning correctly;

[0042] The displacement sensor and pressure sensor are functioning correctly.

[0043] Strip material was detected at both the entrance and exit light gratings;

[0044] This invention provides appropriate control over each step of the aluminum cold rolling mill's start-up process, pre-programming and solidifying each step. The operator only needs to press the "automatic start" button to complete a one-button start, avoiding quality problems caused by improper human operation. Practical experience has proven that this control method effectively solves the problem of start-up marks and has been successfully applied in the field.

[0045] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. An application method of an automatic start-up control system for solving the start-up marks of an aluminum cold rolling mill, characterized in that, The control system comprises an unwinder, a deflector roller, a shape roller, a coiler, an outlet grating, an inlet grating, an upper roller and a lower roller; the two sides of the upper roller are respectively provided with first bearings, and the two sides of the lower roller are respectively provided with second bearings; the lower side of the second bearing is provided with a hydraulic cylinder for driving the lower roller to move in the vertical direction; further comprising a hydraulic system, the hydraulic system drives the hydraulic cylinder to move, the hydraulic system comprises a first pressure sensor and a second pressure sensor; the first pressure sensor is arranged on the operation side of the hydraulic system, and the second pressure sensor is arranged on the transmission side of the hydraulic system; further comprising a first displacement sensor arranged on the operation side of the hydraulic system and a second displacement sensor arranged on the transmission side of the hydraulic system; Further comprising a rolled strip and a main machine; the main machine is connected with a speed reducer, and the two shafts output by the speed reducer are respectively connected with a universal joint of the upper roller and a universal joint of the lower roller; the upper roller and the lower roller are driven to rotate by the rotation of the main machine; the main machine is provided with an encoder, the rotation speed of the motor is measured by the encoder, and the linear speed V of the upper roller and the lower roller is calculated; a spray beam is installed on the inlet side of the upper roller and the lower roller, and the strip and the roller are lubricated by spraying rolling oil through the spray beam; The application method comprises the following steps: Step S1: the aluminum cold rolling mill starts to operate under the condition that the starting condition is met, and an operator presses the "automatic starting" button; Step S2: a given target roll gap value h1 is set, h1 = inlet strip thickness H + 5 mm; Step S3: the hydraulic cylinder starts to drive the lower roller to move upward, and the spray beam starts to spray oil for lubrication at the same time; Step S4: when the first displacement sensor and the second displacement sensor detect the value h = h1, the distance between the upper roller and the lower roller is the roll gap value h, the hydraulic cylinder stops moving upward, and the main machine starts to drive the upper roller and the lower roller to rotate at a given target linear speed of 3 m / min; Step S5: when the roll linear speed V = 3 m / min, the hydraulic cylinder continues to move upward until the first pressure sensor and the second pressure sensor detect that the pressure is greater than 250 tons, which represents that the roller has been pressed against the strip at this time; Step S6: the unwinder and the coiler automatically establish tension, and the main machine is given a target linear speed of 15 m / min; Step S7: when the roll linear speed V = 15 m / min, the automatic starting control is completed, and the strip starts to be rolled; The starting includes the following conditions: The main machine operating condition is met and is in a stopped state; The unwinder and the coiler operating condition are met and are in a stopped state; The shape roller and the deflector roller operating condition are met and are in a stopped state; The hydraulic system is in normal operation; The nozzle system is fault-free; The displacement sensor and the pressure sensor are fault-free; The strip is detected by the inlet and outlet gratings.

2. The application method of the automatic start-up control system for solving the start-up mark of the aluminum cold rolling mill according to claim 1, characterized in that, Also include PLC program controller, nozzle control, first servo valve controller and second servo valve controller, the first servo valve controller and second servo valve controller control the operating side and transmission side of the hydraulic system respectively;The deflector roller, plate-shaped roller, uncoiler and coiler are connected with an encoder respectively;The deflector roller, plate-shaped roller, PLC program controller, uncoiler, main machine and coiler are connected in turn and transmit signals through DP communication;The first pressure sensor, second pressure sensor, nozzle control, inlet grating, outlet grating, first servo valve controller, second servo valve controller are connected with the PLC program controller.

3. The application method of the automatic start-up control system for solving the start-up mark of the aluminum cold rolling mill according to claim 2, characterized in that, The first displacement sensor is connected with the PLC program controller through a first MD20B module, and the second displacement sensor is connected with the PLC program controller through a second MD20B module.

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