阅读说明：本技术 一种七辊矫直机辊缝快速标定控制系统及控制方法 (Rapid calibration control system and control method for roll gap of seven-roll straightener ) 是由 杨小勇 丁频 李宇 张贤 任福平 杨婧 梁慧娟 张若男 付海华 于 2019-10-31 设计创作，主要内容包括：本发明提供了一种七辊矫直机辊缝快速标定控制系统,包括矫直机上辊,驱动矫直机上辊移动的液压缸,为液压缸提供动力的油泵,液压缸与油泵之间连接有比例阀,矫直机上辊还连接有压力监测装置和位移监测装置,比例阀的信号输入端与PLC控制系统的信号输出端连接,压力监测装置和位移监测装置的信号输出端均与PLC控制系统的信号输入端连接,PLC控制系统上还连接有人机界面。PLC控制系统中设有V-S曲线速度调整程序。人机界面包括维护模式界面、矫直辊缝设定界面、实际辊缝显示界面。本发明通过在PLC控制系统中设置V-S曲线速度调整程序对矫直机上辊的压下速度进行自动调整,并对该压下距离进行存储,即可实现对矫直机辊缝的快速标定。(The invention provides a roll gap quick calibration control system of a seven-roll straightener, which comprises an upper roll of the straightener, a hydraulic cylinder for driving the upper roll of the straightener to move, an oil pump for providing power for the hydraulic cylinder, a proportional valve connected between the hydraulic cylinder and the oil pump, a pressure monitoring device and a displacement monitoring device connected with the upper roll of the straightener, wherein the signal input end of the proportional valve is connected with the signal output end of a PLC control system, the signal output ends of the pressure monitoring device and the displacement monitoring device are both connected with the signal input end of the PLC control system, and a human-computer interface is also connected with the PLC control system. The PLC control system is provided with a V-S curve speed adjusting program. The human-computer interface comprises a maintenance mode interface, a straightening roll gap setting interface and an actual roll gap display interface. According to the invention, the V-S curve speed adjusting program is set in the PLC control system to automatically adjust the pressing speed of the upper roller of the straightener, and the pressing distance is stored, so that the rapid calibration of the roller gap of the straightener can be realized.)

1. The utility model provides a seven roller straightener roll gap mark control system fast, its characterized in that, includes roller (3) on the straightener, and pneumatic cylinder (1) that roller (3) removed are gone up in the drive straightener, for pneumatic cylinder (1) provide oil pump (9) of power, be connected with proportional valve (2) between pneumatic cylinder (1) and oil pump (9), roller still is connected with pressure monitoring device (4) and displacement monitoring device (5) on the straightener, the signal input part of proportional valve (2) is connected with the signal output part of PLC control system (6), the signal output part of pressure monitoring device (4) and displacement monitoring device (5) all is connected with the signal input part of PLC control system (6), still be connected with human-computer interface (7) on PLC control system (6).

2. The roll gap quick calibration control system of the seven-roll straightener as claimed in claim 1, characterized in that a V-S curve speed adjustment program is provided in the PLC control system (6).

3. The roll gap quick calibration control system of the seven-roll straightener as claimed in claim 2, characterized in that the human-machine interface (7) comprises a maintenance mode interface, a straightening roll gap setting interface, and an actual roll gap display interface.

4. A method for controlling quick calibration of a roll gap of a seven-roll straightener, which is characterized in that the system for controlling quick calibration of the roll gap of the seven-roll straightener in claim 3 is adopted, and the method specifically comprises the following steps:

step 1, lifting an upper roller (3) of a straightener, and placing a roll gap calibration plate (8) on the upper surface of a lower roller of the straightener;

step 2, selecting a maintenance mode interface on the human-computer interface (7), adjusting the straightening machine to a maintenance mode, and inputting a target pressure value;

step 3, switching on the hydraulic cylinder (1) to enable the hydraulic cylinder (1) to drive the upper roller (3) of the straightener to start to press down, monitoring the pressing distance S of the upper roller (3) of the straightener by using the displacement monitoring device (5), monitoring the pressure value of the upper roller (3) of the straightener by using the pressure monitoring device (4), and transmitting the monitoring result to the PLC control system (6) by using the pressure monitoring device (4) and the displacement monitoring device (5);

step 4, generating a control signal by the PLC control system (6) according to the received distance information and pressure information, transmitting the control signal to the proportional valve (2), and adjusting the opening of the proportional valve (2), so that the pressing speed V of the upper roller (3) of the straightener is adjusted until the pressure value of the upper roller (3) of the straightener reaches a target pressure value, and stopping pressing the upper roller (3) of the straightener;

step 5, storing real-time parameter values of the displacement monitoring device (5) after the upper roller (3) of the straightener stops through the PLC control system (6);

and 6, lifting the upper roller (3) of the straightener to the initial height, and closing the maintenance mode interface to finish the roll gap calibration process of the straightener.

5. The method for rapidly calibrating and controlling the roll gap of the seven-roll straightener as claimed in claim 4, wherein in the step 4, the process of adjusting the pressing speed V of the upper roll (3) of the straightener by the PLC control system (6) is as follows:

firstly, a PLC control system (6) processes the received pressing distance S of the upper roller (3) of the straightener through a V-S curve speed adjusting program to obtain the real-time pressing speed of the upper roller (3) of the straightener, and generates a control signal to be transmitted to a proportional valve (2);

secondly, the proportional valve (2) adjusts the opening according to the received control signal, changes the oil flow delivered to the hydraulic cylinder (1) by the oil pump (9), and adjusts the extension speed of the hydraulic cylinder (1), and the pressing speed V of the upper roller (3) of the straightener is driven by the hydraulic cylinder (1) to synchronously change with the extension speed of the hydraulic cylinder (1);

and thirdly, transmitting the monitored real-time pressure value of the upper roller (3) of the straightener to a PLC control system (6) by a pressure monitoring device (4), sending a signal to the proportional valve (2) by the PLC control system (6) after the real-time pressure value of the upper roller (3) of the straightener reaches a set value, controlling the proportional valve (2) to be closed, and stopping pressing down the upper roller (3) of the straightener.

6. The method for rapidly calibrating and controlling the roll gap of a seven-roll straightener as claimed in claim 5, characterized in that the reduction distance S of the upper roll (3) of the straightener comprises a high speed section S₁And a low speed section S₂The height of the upper roller (3) of the straightener before rolling is H away from the rolling line₁The height from the contact point of the upper roller (3) of the straightener and the lower roller of the straightener is H₂The thickness of the roll gap calibration plate (8) is H₀Said S₁<(H₁-H₀)，(H₁-H₀)<S₂<H₂。

7. The method for rapidly calibrating and controlling the roll gap of a seven-roll straightener as claimed in claim 6, characterized in that the reduction speed V of the upper roll (3) of the straightener comprises an initial speed V₀High speed section velocity V_hLow speed stage speed V_lSaid V is₀＝0，V_hThe maximum screw-down speed and the low-speed section speed V which can be reached by the upper roller (3) of the straightener_lThe value range of (A) is not less than 0.02mm/s and not more than V_lNot more than 0.05mm/s, after the upper roller (3) of the straightener starts to be pressed down, the pressing-down speed V is quickly changed from the initial speed V under the control of a PLC control system₀Increased to the maximum pressing speed V_hThe pressing distance S of the upper roller (3) of the straightener reaches S₁When the system is started, the system is controlled by a PLC control system (6)Speed V of reducing to low speed section_lAnd continuing to press down to enable the real-time pressure value of the upper roller (3) of the straightener to reach the preset value in the PLC control system (6), and stopping the upper roller (3) of the straightener.

Technical Field

The invention belongs to the technical field of mechanical control, and relates to a roller gap quick calibration control system of a seven-roller straightener and a roller gap quick calibration control method of the seven-roller straightener.

Background

The straightener is a common strip steel processing device in the steel industry, and a seven-roller straightener is usually arranged in a hot leveling unit, so that the straightener can play a role in straightening strip steel and improving plate shape. The seven-roller straightener widely adopts a structure that the upper rollers of 3 straightening rollers can be hydraulically adjusted independently, 1 proportional valve drives 2 hydraulic cylinders to accurately control the roll gap of the straightening roller, and each hydraulic cylinder is internally provided with a displacement sensor for position monitoring to form roll gap closed-loop control.

In practical application, the straightening machine may need to perform roll gap maintenance calibration due to accumulated errors of roll gaps or replacement of new rolls, and generally, the calibration steps are more, and one calibration needs tens of minutes. For example, firstly opening a roll gap of a straightener, and hoisting a special calibration plate (with standard thickness and material quality) by using a crane; manually and sequentially pressing down each straightening roller in a inching mode until a field operator visually observes that 3 straightening upper rollers can press the surface of the calibration plate, at the moment, the calibration button can be pressed down for operation, and the value of the current position sensor is stored for a roll gap calculation program; and finally, manually opening the straightening roll gap to a lifting position, and finishing calibration, wherein the whole process is time-consuming and labor-consuming.

Disclosure of Invention

The invention aims to provide a quick roll gap calibration control system of a seven-roll straightener, and solves the problem that the roll gap calibration and checking program of the straightener in the existing hot leveling unit is complicated.

The invention also aims to provide a method for controlling the quick calibration of the roll gap of the seven-roll straightening machine, which solves the problem of complicated roll gap calibration and checking procedures of the straightening machine in the existing hot leveling unit.

The technical scheme adopted by the invention is that,

the utility model provides a seven roller straightener roll gaps mark control system fast, roller on the straightener, the pneumatic cylinder that roller removed is gone up to the drive straightener, the oil pump for the pneumatic cylinder provides power, be connected with the proportional valve between pneumatic cylinder and the oil pump, roller still is connected with pressure monitoring device and displacement monitoring device on the straightener, the signal input part of proportional valve is connected with PLC control system's signal output part, pressure monitoring device and displacement monitoring device's signal output part all are connected with PLC control system's signal input part, still be connected with human-computer interface on the PLC control system.

Yet another feature of the present invention is that,

the PLC control system is provided with a V-S curve speed adjusting program.

The human-computer interface comprises a maintenance mode interface, a straightening roll gap setting interface and an actual roll gap display interface.

Another technical scheme of the present invention is that a method for controlling rapid calibration of a roll gap of a seven-roll straightener adopts the system for controlling rapid calibration of a roll gap of a seven-roll straightener as claimed in claim 3, and specifically comprises the following steps:

step 1, lifting an upper roller of a straightener, and placing a roll gap calibration plate on the upper surface of a lower roller of the straightener;

step 2, selecting a maintenance mode interface on the human-computer interface, adjusting the straightening machine to a maintenance mode, and inputting a target pressure value;

step 3, switching on a hydraulic cylinder to enable the hydraulic cylinder to drive an upper roller of the straightener to start to press down, monitoring the pressing distance S of the upper roller of the straightener by a displacement monitoring device, monitoring the pressure value of the upper roller of the straightener by a pressure monitoring device, and transmitting the monitoring result to a PLC control system by the pressure monitoring device and the displacement monitoring device;

step 4, the PLC control system generates a control signal according to the received distance information and pressure information, transmits the control signal to the proportional valve, and adjusts the opening of the proportional valve, so that the pressing speed V of the upper roller of the straightener is adjusted until the pressure value of the upper roller of the straightener reaches a target pressure value, and the upper roller of the straightener stops pressing;

step 5, storing real-time parameter values of the displacement monitoring device after the upper roller of the straightener is stopped through a PLC control system;

and 6, lifting the upper roller of the straightener to the initial height, and closing the maintenance mode interface to finish the roll gap calibration process of the straightener.

In the step 4, the process of adjusting the pressing speed V of the upper roller of the straightener by the PLC control system is as follows:

firstly, processing the received pressing distance S of the upper roller of the straightener by a PLC control system through a V-S curve speed adjusting program to obtain the real-time pressing speed of the upper roller of the straightener, generating a control signal and transmitting the control signal to a proportional valve;

secondly, the proportional valve adjusts the opening according to the received control signal, changes the oil flow delivered to the hydraulic cylinder by the oil pump, and adjusts the extension speed of the hydraulic cylinder, and the pressing speed V of the upper roller of the straightener is driven by the hydraulic cylinder to synchronously change with the extension speed of the hydraulic cylinder;

and thirdly, transmitting the monitored real-time pressure value of the upper roller of the straightener to a PLC control system by a pressure monitoring device, sending a signal to a proportional valve by the PLC control system after the real-time pressure value of the upper roller of the straightener reaches a set value, controlling the proportional valve to be closed, and stopping pressing the upper roller of the straightener.

The pressing distance S of the upper roller of the straightener comprises a high-speed section S₁And a low speed section S₂The height of the upper roller of the straightener before pressing is H away from the rolling line₁The height from the contact point of the upper roller of the straightener and the lower roller of the straightener is H₂The thickness of the roll gap calibration plate is H₀，S₁<(H₁-H₀)，(H₁-H₀)<S₂<H₂。

The rolling speed V of the upper roll of the straightener comprises an initial speed V₀High speed section velocity V_hLow speed stage speed V_l，V₀＝0，V_hThe maximum pressing speed and the low-speed section speed V which can be reached by the upper roller of the straightener_lThe value range of (A) is not less than 0.02mm/s and not more than V_lNot more than 0.05mm/s, and after the upper roller of the straightener starts to be pressed down, the pressing-down speed V is quickly controlled by the PLC control system from the initial speed V₀Increased to the maximum pressing speed V_hThe rolling distance S of the upper roller of the straightener reaches S₁When the speed is reduced to the low-speed V under the control of the PLC control system_lAnd continuing pressing to make the upper roller of the straightener contact with the lower roller of the straightener, and stopping the upper roller of the straightener.

The method has the advantages that the V-S curve speed adjusting program is arranged in the PLC control system to automatically adjust the pressing speed of the upper roller of the straightener, so that the pressing distance of the upper roller of the straightener is quickly determined, and the pressing distance is stored, and the quick calibration of the roller gap of the straightener can be realized. The invention reduces the time for calibrating the roll gap maintenance of the straightening machine, can be put into production more quickly and improves the production efficiency.

Drawings

FIG. 1 is a schematic diagram of a roll gap rapid calibration control system of a seven-roll straightener of the present invention;

FIG. 2 is a schematic drawing of the pressing stroke of the upper roll of the straightener by the method for controlling the quick calibration of the roll gap of the seven-roll straightener of the invention;

FIG. 3 is a schematic diagram of a V-S curve speed adjustment module of a seven-roll straightener roll gap rapid calibration control system of the present invention.

In the figure, 1, a hydraulic cylinder, 2, a proportional valve, 3, an upper roller of a straightener, 4, a pressure monitoring device, 5, a displacement monitoring device, 6, a PLC control system, 7, a human-computer interface, 8, a roller gap calibration plate and 9, an oil pump are arranged.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The invention provides a roll gap quick calibration control system of a seven-roll straightener, which comprises an upper roll 3 of the straightener, a hydraulic cylinder 1 for driving the upper roll 3 of the straightener to move, an oil pump 9 for providing power for the hydraulic cylinder 1, a proportional valve 2 connected between the hydraulic cylinder 1 and the oil pump 9, a pressure monitoring device 4 and a displacement monitoring device 5 connected with the upper roll of the straightener, wherein the signal input end of the proportional valve 2 is connected with the signal output end of a PLC control system 6, the signal output ends of the pressure monitoring device 4 and the displacement monitoring device 5 are both connected with the signal input end of the PLC control system 6, and a human-computer interface 7 connected with the PLC control system 6.

The PLC control system 6 is provided with a V-S curve speed adjusting program. The human-machine interface 7 comprises a maintenance mode interface, a straightening roll gap setting interface and an actual roll gap display interface.

The invention also provides a method for controlling the quick calibration of the roll gap of the seven-roll straightener, which adopts a system for controlling the quick calibration of the roll gap of the seven-roll straightener and specifically comprises the following steps:

step 1, lifting an upper roller 3 of a straightener, and placing a roll gap calibration plate 8 on the upper surface of a lower roller of the straightener;

step 2, selecting a maintenance mode interface on the human-computer interface 7, adjusting the straightening machine to a maintenance mode, and inputting a target pressure value;

step 3, switching on the hydraulic cylinder 1 to enable the hydraulic cylinder 1 to drive the upper roller 3 of the straightener to start to press down, monitoring the pressing distance S of the upper roller 3 of the straightener by using the displacement monitoring device 5, monitoring the pressure value of the upper roller 3 of the straightener by using the pressure monitoring device 4, and transmitting the monitoring result to the PLC control system 6 by using the pressure monitoring device 4 and the displacement monitoring device 5;

step 4, the PLC control system 6 generates a control signal according to the received distance information and pressure information, transmits the control signal to the proportional valve 2, and adjusts the opening of the proportional valve 2, so that the pressing speed V of the upper roller 3 of the straightener is adjusted until the pressure value of the upper roller 3 of the straightener reaches a target pressure value, and the upper roller 3 of the straightener stops pressing;

step 5, storing the real-time parameter value of the displacement monitoring device 5 after the upper roller 3 of the straightener is stopped through the PLC control system 6;

and 6, lifting the upper roller 3 of the straightener to the initial height, and closing the maintenance mode interface to finish the roll gap calibration process of the straightener.

In the step 4, the process of adjusting the pressing speed V of the upper roller 3 of the straightener by the PLC control system 6 is as follows:

firstly, the PLC control system 6 processes the received pressing distance S of the upper roller 3 of the straightener through a V-S curve speed adjusting program to obtain the real-time pressing speed of the upper roller 3 of the straightener, generates a control signal and transmits the control signal to the proportional valve 2;

secondly, the proportional valve 2 adjusts the opening according to the received control signal, changes the oil flow delivered to the hydraulic cylinder 1 by the oil pump 9, and adjusts the extension speed of the hydraulic cylinder 1, and the pressing speed V of the upper roller 3 of the straightener is driven by the hydraulic cylinder 1 to synchronously change with the extension speed of the hydraulic cylinder 1;

and thirdly, transmitting the monitored real-time pressure value of the upper roller 3 of the straightener to a PLC (programmable logic controller) control system 6 by a pressure monitoring device 4, sending a signal to the proportional valve 2 by the PLC control system 6 after the real-time pressure value of the upper roller 3 of the straightener reaches a set value, controlling the proportional valve 2 to be closed, and stopping pressing down the upper roller 3 of the straightener.

As shown in FIG. 2, the reduction distance S of the upper roll 3 of the leveler includes a high speed section S₁And a low speed section S₂Before the upper roll 3 of the straightener is pressed down, the height from the rolling line is H₁The height from the contact point of the upper roller 3 of the straightener and the lower roller of the straightener is H₂The thickness of the roll gap calibration plate 8 is H₀，S₁<(H₁-H₀)，(H₁-H₀)<S₂<H₂。

As shown in FIG. 3, the reduction speed V of the upper roll 3 of the leveler includes an initial speed V₀High speed section velocity V_hLow speed stage speed V_l，V₀＝0，V_hThe maximum pressing speed of the upper roller 3 of the straightener, the low-speed section speed V_lThe value range of (A) is not less than 0.02mm/s and not more than V_lNot more than 0.05mm/s, after the upper roll 3 of the straightener starts to be pressed down, the pressing-down speed V is quickly changed from the initial speed V under the control of the PLC control system₀Increased to the maximum pressing speed V_hThe pressing distance S of the upper roller 3 of the straightener reaches S₁Then, the speed is reduced to a low-speed V under the control of the PLC control system 6_lThe upper roller 3 of the straightener is contacted with the lower roller of the straightener by continuously pressing down, and then the straightener is straightenedThe upper roll 3 of the straightening machine is stopped.

The working principle of the invention is that the rolling distance S and the real-time pressure value of the upper roll 3 of the straightener are monitored by arranging the displacement monitoring device 5 and the pressure monitoring device 4, monitoring data are fed back to the PLC control system 6, after the PLC control system 6 receives signals transmitted by the displacement monitoring device 5, the rolling speed V of the upper roll 3 of the straightener at the corresponding position is calculated by a V-S curve speed adjusting program, a control signal generated by the calculation result is transmitted to the proportional valve 2, the speed of oil liquid of the oil pump 9 flowing into the hydraulic cylinder 1 is adjusted by the proportional valve 2, so that the rolling speed of the upper roll 3 of the straightener is adjusted, and when the pressure value of the upper roll 3 of the straightener reaches the preset value in the PLC control system 6, the upper roll 3 of the straightener stops. And then storing the real-time distance S of the rolling of the upper roller 3 of the straightener monitored by the displacement monitoring device 5 through a PLC control system. And lifting the upper roller 3 of the straightener to the initial height, and finishing the calibration process of the roller gap of the straightener.