Method for using a position detection and linear control system for a section change position of a straightening machine

Abstract

The application discloses a position detection and linear control system for a position of a straightening and withdrawing machine, which comprises a position detection device and a control module. The position detection device is provided with a position sensor, which collects position data of an upper roller connected with a hydraulic cylinder when a dummy bar is drawn, and transmits the position data to the control module. The control module establishes a position monitoring model of the upper roller of the straightening and withdrawing system and an intelligent linear lifting adjustment model of a position of a face change according to the position data, so as to control the hydraulic cylinder. The system can detect the position data of the upper roller in real time through the position sensor, establish a corresponding model, accurately adjust a valve switching direction of a face change hydraulic cylinder and a process of a servo valve, effectively control position fluctuation of the upper roller during the face change, reduce position control risks, reduce a failure rate of equipment, prolong a service life of the equipment, realize long-period online stable operation of the straightening and withdrawing machine, guarantee stable continuous casting production, and achieve outstanding comprehensive benefits. In addition, the application further discloses a use method of the system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of the straightening and withdrawing machine, in particular, the present application relates to a straightening and withdrawing machine position detection and section change position linear control system and its using method. BACKGROUND

[0002] In the process of modern large section continuous casting machine production, due to the gradual expansion of the section of the casting blank, the pressure of the straightening and withdrawing system, the weight of the dummy bar, the change of the pulling speed and the accompanying hydraulic capacity also change continuously. The section change of the large section continuous casting machine is from 600mm to 1200mm, the pressure provided by a single hydraulic cylinder reaches 200t, and the pulling speed changes in a large range from 0.08-0.35m / min, which leads to a huge lateral force when the dummy bar is pulled in the process of the straightening and withdrawing system, causing the displacement damage of the hydraulic cylinder of the straightening and withdrawing system, the distortion of the frame top plate, the cracking and falling of the lifting slide, the extrusion and fragmentation of the reduction motor, the jamming of the dummy bar, the stagnation of the red blank and other series of problems, otherwise it will cause the problem of the downward sliding of the dummy bar, affecting the safety production.

[0003] Therefore, through the technical application, the intelligent linear control of the section change position is realized, the demand of the position detection of the straightening and withdrawing system of the large section continuous casting machine is met, and it has certain necessity and provides intelligent technical support measures for low-carbon smelting.

[0004] The patent document with publication number CN112008055A discloses a continuous casting dummy bar positioning detection system and method, which comprises a position monitoring unit, a laser projection unit, an image detection unit and an image processing unit. The position monitoring unit calculates the rotational displacement increment of the conveying roller in each sampling period, accumulates the displacement increment to continuously track the coordinate position of the dummy bar and calibrates it. The laser projection unit projects the auxiliary positioning laser to the dummy bar and reflects it to the image detection unit. The image detection unit detects the image formed by the laser, processes the image and forms digital image information. The image processing unit receives the digital image information of the image detection unit, analyzes and processes the digital image information according to the coordinate position of the position monitoring unit, and sends the dummy bar head and tail arrival signal to the position monitoring unit. The application can realize the automatic calibration of the positioning detection error of the multi-flow continuous casting machine dummy bar, and has the advantages of high precision, stability and reliability, maintenance-free and low cost. However, the application does not solve the position detection of the upper roller of the straightening and withdrawing machine, and there is no real-time model of position control, so the position monitoring and start-stop control of the hydraulic valve of the straightening and withdrawing machine during the inclined section of the dummy bar cannot be realized, and the straightening and withdrawing machine still has the risk of damage caused by the asynchronous hydraulic cylinder.

[0005] The patent document with the authorization publication number CN201653361U discloses a dummy bar position detection device, which comprises a dummy bar and a photoelectric switch. Two in-situ detection through holes are arranged in the middle part of the dummy bar, and a breakout detection through hole is arranged on the rod body close to the free end of the dummy bar. The photoelectric switch is four, and every two photoelectric switches are arranged on the upper and lower sides of the in-situ detection through hole respectively. The opposite two photoelectric switches are located on the same vertical line. The utility model has the advantages of simple structure, high position detection accuracy (more than 99%), high accuracy of dummy bar position detection, reduced maintenance amount of maintenance workers, and high indirect benefits. The application aims to provide a dummy bar position detection device, which has simple structure, can quickly and accurately detect the position of the dummy bar, can prevent the breakout of the dummy bar, can reduce the misoperation rate, and is easy to maintain and repair. However, the application does not detect the actual position of the roll of the stretch leveler, cannot solve the deviation of the actual position of the stretch leveler and the dummy bar, and cannot effectively control the actual position of the roll of the stretch leveler.

[0006] The patent document with the authorization publication number CN209491324U discloses a plate bad continuous casting silver roller actual position detection device, which comprises an upper driving roller and a lower driving roller arranged in an upper and lower interval. A partition wall is arranged on one side of the upper and lower driving rollers. A motor base is arranged on the back of the partition wall. An upper driving motor and a lower driving motor are arranged on the motor base in an upper and lower interval. The shafts of the upper and lower driving motors are connected to the upper driving roller and the lower driving roller through universal couplings. A proximity switch connected to the control unit of the driving motor is arranged on the back of the partition wall above the shaft of the driving motor. The application can prevent equipment failure caused by the actual position of the driving roller being advanced or delayed, improve the service life of the continuous casting sector, reduce the breakout failure rate of the dummy bar, and reduce the labor intensity of the personnel. However, the application cannot track the position of the stretch leveler during the change of the cross section. SUMMARY

[0007] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a stretch leveler position detection and cross section change position linear control system, which aims to position deviation range and improve precision.

[0008] In order to achieve the above object, the technical scheme adopted by the present application is: a position detection and linear control system for a section change position of a straightening machine, comprising a position detection device and a control module, the position detection device comprises a position sensor for collecting position data of an upper roller of the straightening machine during a process of drawing a blank by means of an ingot rod, the upper roller is connected with a hydraulic cylinder, the position sensor is electrically connected with the control module, the control module establishes a position monitoring model of the upper roller of the straightening system and an intelligent linear lifting adjustment model for a section change position according to data transmitted by the position sensor, and control of the hydraulic cylinder is realized.

[0009] The hydraulic cylinder is provided with two, and the position detection device is also provided with two, and the two position detection devices are respectively located at two ends of the upper roller.

[0010] The position detection device further comprises a measurement reference seat, an upper base of the sensor and a lower base, the position sensor is arranged on the lower base, the lower base is arranged on the measurement reference seat, the upper base of the sensor is located above the lower base, and the measurement reference seat is arranged on the upper roller.

[0011] The upper base of the sensor is installed on a cross beam of a frame through first bolts, the position sensor is installed on the lower base through second bolts, and the lower base is installed on the measurement reference seat through third bolts.

[0012] The lower base is provided with a second mounting hole for allowing the second bolts to pass through and a third mounting hole for allowing the third bolts to pass through, and the second mounting hole and the third mounting hole are waist-shaped holes.

[0013] The position sensor is a laser ranging sensor.

[0014] The present application also provides a use method of the position detection and linear control system for a section change position of the straightening machine, comprising the following steps:

[0015] S1, a position monitoring model of an upper roller of a straightening system is established;

[0016] S2, a position monitoring value of the straightening system is calibrated;

[0017] S3, linear control of a section change position of the straightening machine is performed, and an operation process of an oil supply valve of the hydraulic cylinder is adjusted.

[0018] In the step S1, the position sensor collects the position data of the upper roller when the ingot rod is replaced each time the straightening machine changes a section, and a position monitoring model S is established 测 =S0+ (K x V x x t-L0), wherein S 测 is data collected by the position sensor, S0 is a given value of an initial straight section position of the ingot rod, K is a slope of the ingot rod, V xRespectively, the casting speed of different cross-section, t is the time of drawing the blank, L0 is the length of the straight section of the dummy bar.

[0019] The step S2 comprises:

[0020] S201, setting the initial value of the upper roll position of the withdrawal straightening machine as S 测1 max , that is, S 测1 = the maximum opening value.

[0021] S202, setting the given value of the control system as S 测2 =S0 when the withdrawal straightening machine is in the straight section of the dummy bar during the roll changing of the continuous casting machine, S0 is the given value of the initial cross-section position of the dummy bar.

[0022] S203, setting the standard position calculation model when the roll gap of the withdrawal straightening machine is fully opened and the straight section of the dummy bar is clamped, the standard position calculation model S 标max =S 测1 , S 标min =S0.

[0023] S204, setting S 标max as the calibration full opening value, and setting S 标min as the calibration straight section reduction value when the withdrawal straightening machine is in the blank drawing operation.

[0024] The step S3 comprises:

[0025] S301, after the calibration is completed, collecting the low position value S 低 of the working position of the upper roll and the high position value S 高 of the working position of the upper roll.

[0026] S302, setting the data collection period of the working position of the upper roll as n seconds.

[0027] S303, calculating the real-time value S x of the roll gap, S x = (S 高 -S 低 ) / T x n, wherein T is the time required for the movement of the slope section of the dummy bar with a changed cross-section through the upper roll of the withdrawal straightening machine.

[0028] S304, calculating the position rising value △S n every n seconds, △S n =S n+1 -S n , n is a positive integer.

[0029] S305, by comparing △S n and S x , selecting the corresponding control strategy according to the comparison result to realize the control of the execution action of the hydraulic cylinder.

[0030] ​The position detection and linear control system of the withdrawal straightening machine of the present application detects the running position data of the upper roll of the withdrawal straightening machine in real time through a position sensor, establishes a position monitoring model of the upper roll of the withdrawal straightening system and an intelligent linear lifting adjustment model of the position of the face change, accurately adjusts the switching direction of the valve of the face change hydraulic cylinder and the running process of the servo valve, effectively controls the position fluctuation of the upper roll caused by the face change, reduces the possible risks of position control, reduces the equipment failure rate, prolongs the service life of the equipment, realizes the goal of long-period online stable operation of the withdrawal straightening machine, guarantees the stable operation of the continuous casting production, and has remarkable comprehensive benefits. BRIEF DESCRIPTION OF DRAWINGS

[0031] The present specification includes the following drawings, and the shown contents are respectively:

[0032] Figure 1 It is a structure schematic diagram of the position detection and linear control system of the withdrawal straightening machine of the present application;

[0033] Figure 2 It is a linear control implementation effect curve diagram of the face change position of the withdrawal straightening system of the continuous casting machine;

[0034] Figure 3 It is a safety control mathematical model diagram;

[0035] Figure 4 It is a real-time change characteristic curve diagram of the face change position of the withdrawal straightening machine of the continuous casting machine;

[0036] Figure 5 It is a position control diagram of the withdrawal straightening system of the continuous casting machine in the present application;

[0037] Figure 6 It is a structure schematic diagram of the position model of the upper roll of the withdrawal straightening machine in the present application;

[0038] Figure 7 It is a front view of the position detection device;

[0039] Figure 8 It is a side view of the position detection device;

[0040] Figure 9 It is a position detection schematic diagram of the withdrawal straightening system;

[0041] Figure 10 It is a face change position control logic diagram of the withdrawal straightening system;

[0042] Figure 11 It is a structure schematic diagram of the dummy bar;

[0043] Marked in the figure: 1, host computer; 2, position detection device; 21, sensor upper base; 22, first bolt; 23, locking nut; 24, position sensor; 25, lower base; 26, measurement reference seat; 3, straightening machine; 31, connecting device; 32, upper roller; 4, dummy bar; 41, straight section; 42, inclined section; 5, hydraulic cylinder; 6, frame upper cross beam; 7, transmitter; 8, PLC controller. DETAILED DESCRIPTION

[0044] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings, and the purpose is to help the technical personnel in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present application, and to help its implementation.

[0045] It should be noted that in the embodiments described below, the "first", "second", "third" and "fourth" do not represent an absolute distinction in structure and / or function, nor do they represent the execution order, but only for the convenience of description.

[0046] As shown in Figure 1 , Figures 5 to 9 The present application provides a straightening machine position detection and cross-section change position linear control system, which comprises a position detection device 2 and a control module, the position detection device 2 comprises a position sensor 24 for collecting position data of the upper roller 32 of the straightening machine during the dummy bar drawing process, the upper roller 32 is connected with the hydraulic cylinder 5, the position sensor 24 is electrically connected with the control module, the control module establishes a straightening system upper roller position monitoring model and a cross-section change position intelligent linear lifting adjustment model according to the data transmitted by the position sensor 24, controls the opening degree and oil supply speed of the corresponding valve in the oil supply pipeline of the hydraulic cylinder 5, realizes the control of the hydraulic cylinder 5, makes the hydraulic cylinder 5 execute corresponding actions, and finally realizes the accurate adjustment of the position of the upper roller 32.

[0047] Specifically, the present application is aimed at the straightening system of a large-section continuous casting machine, the position detection device 2 is used to monitor the running position data of the upper roller 32 of the straightening machine in real time, a real-time position detection model of the upper roller of the straightening machine and an intelligent displacement adjustment model of the cross-section change position are established, the running process of the upper roller 32 is accurately adjusted, the fluctuation of the cross-section of the dummy bar generated by the cross-section change is effectively controlled, the position deviation range is reduced, the equipment crushing failure is reduced, the online life of the equipment is prolonged, the long-life goal of the straightening machine is realized, and intelligent technical support is provided for low-carbon smelting.

[0048] As shown in Figure 5 and Figure 6As shown, the straightening machine is provided with an upper roller 32 and a lower roller, the upper roller 32 is located above the lower roller, and the straightening machine is used for clamping and pushing the dummy bar. Two hydraulic cylinders 5 are provided, and two position detection devices 2 are also provided, and the two position detection devices 2 are respectively located at the two ends of the upper roller 32. The upper roller 32 of the straightening machine is provided with a connecting device 31, two parallel hydraulic cylinders 5 are arranged on the connecting device 31, and the straightening frame is provided with an external position detection device 2.

[0049] As shown in the figure, Figures 5 to 7 The position detection device 2 further comprises a measurement reference seat 26, a sensor upper base 21 and a lower base 25, the position sensor 24 is fixedly arranged on the lower base 25, the lower base 25 is fixedly arranged on the measurement reference seat 26, the sensor upper base 21 is located above the lower base 25, and the measurement reference seat 26 is fixedly arranged on the upper roller 32. The position sensor 24 measures the position of the upper roller 32 in real time.

[0050] Further, a single continuous casting machine is equipped with four dummy bars, which are arranged in parallel, and usually operates in a simultaneous full-flow or less-flow mode; each dummy bar is operated in a clamping and pushing mode by multiple straightening machines, two hydraulic cylinders 5 are arranged on each straightening machine to press down or lift the upper roller 32, and a set of position detection devices 2 is arranged outside each hydraulic cylinder 5 to detect the position data of the upper roller 32 in real time.

[0051] The control module mainly comprises a transmitter 7 and a PLC controller 8, the transmitter 7 is electrically connected with the position sensor 24, the transmitter 7 is electrically connected with the PLC controller 8, and the PLC controller 8 is electrically connected with the upper computer 1.

[0052] The hydraulic cylinder 5 is connected with an oil supply pipeline, the oil supply pipeline provides hydraulic oil for the hydraulic cylinder 5, the oil supply pipeline is provided with a reversing valve and a servo valve, the reversing valve and the servo valve are electrically connected with the control module, the reversing valve and the servo valve are controlled by the control module, the reversing valve and the servo valve are arranged in series, the servo valve is provided with multiple, the servo valve is connected with the rod cavity and the rodless cavity of the hydraulic cylinder 5, the reversing valve is responsible for changing the flow direction of the hydraulic oil, and the servo valve controls the flow rate and pressure of the hydraulic oil. By controlling the opening degree and oil supply speed of the servo valve and the working state of the reversing valve, the extension and contraction of the hydraulic cylinder 5 are realized.

[0053] The position sensor 24 transmits the detected signal to the transmitter 7, the transmitter 7 transmits the signal to the PLC controller 8, the PLC controller 8 calculates the current position of the upper roller 32 through the built-in PLC control model, intelligently analyzes, controls the reversing of the reversing valve, and switches the rod cavity and the rodless cavity of the hydraulic cylinder 5 by the servo valve.

[0054] As preferred, the position sensor 24 is a laser distance sensor. The range of the laser distance sensor can be 0.02mm-300m, and the accuracy is up to ±1.5mm. The same type of position sensor 24 is installed on each upper base, and the laser position sensor 24 transmits a detection signal to the upper computer 1. The left and right position sensors 24 can effectively monitor the position state of the upper roller 32 of the stretch leveler. Each position sensor 24 is consistent with the straight section S min and the head S max of the dummy bar.

[0055] As shown in Figure 7 and Figure 8 , the sensor upper base 21 is installed on the frame upper beam by the first bolt 22. The frame upper beam is fixedly arranged on the stretch leveler. The position sensor 24 is arranged outside the hydraulic cylinder 5 mounting position. The position sensor 24 is installed on the lower base 25 by the second bolt and the locking nut. The lower base 25 is installed on the measurement reference seat 26 by the third bolt. The sensor upper base 21 and the lower base 25 are in a welded structure.

[0056] As preferred, the lower base 25 is provided with a second mounting hole for the second bolt to pass through. The position sensor 24 is provided with an internal threaded hole for the second bolt to insert. The second mounting hole is vertically arranged on the lower base 25. The second mounting hole is a waist-shaped hole. The length of the second mounting hole is greater than the diameter of the second bolt, so as to facilitate the adjustment of the height position of the position sensor 24. Moreover, multiple second bolts are arranged. All the second bolts are alternately and uniformly arranged, so as to ensure that the position sensor 24 is uniformly stressed.

[0057] As preferred, the lower base 25 is provided with a third mounting hole for the third bolt to pass through. The measurement reference seat 26 is provided with an internal threaded hole for the third bolt to insert. The third mounting hole is horizontally arranged on the lower base 25. The third mounting hole is a waist-shaped hole. The length of the third mounting hole is greater than the diameter of the third bolt, so as to facilitate the adjustment of the horizontal position of the lower base 25 and the position sensor 24.

[0058] The application also provides a use method of the stretch leveler position detection and cross-section position linear control system, which comprises the following steps:

[0059] S1, establishing a stretch leveler system upper roller position monitoring model;

[0060] S2, calibrating the stretch leveler system position monitoring value;

[0061] S3, performing stretch leveler cross-section position lifting linear control, and adjusting the operation process of the oil supply valve of the hydraulic cylinder.

[0062] The real-time position monitoring model of the drawing and straightening system consists of a 4-strand drawing and straightening machine, which is arranged in parallel vertically. It adopts a four-strand or less-strand operation mode to realize the drawing of the ingot rod and changes the section according to the plan.

[0063] like Figure 11 As shown, the dummy bar comprises a connected straight section 41 and an oblique section 42. The straight section 41 is a straight cylindrical structure with a constant outer diameter along its length. The oblique section 42 has an inclined outer surface, with an obtuse angle between the inclined outer surface of the oblique section 42 and the longitudinal direction of the straight section 41. The straight section 41 is the traction section of the dummy bar, while the oblique section 42 is the transition section of the dummy bar.

[0064] The two hydraulic cylinders 5 connected to the upper roller 32 are arranged on the left and right sides, and are connected to the left and right ends of the upper roller 32 respectively. The rodless chamber of the left hydraulic cylinder 5 is connected to a servo valve, and the servo valve connected to the rodless chamber of the left hydraulic cylinder 5 is set as the first servo valve. The rodless chamber of the right hydraulic cylinder 5 is connected to a servo valve, and the servo valve connected to the rodless chamber of the right hydraulic cylinder 5 is set as the second servo valve. The servo valve connected to the rod chamber of the left hydraulic cylinder 5 is set as the third servo valve, and the servo valve connected to the rod chamber of the right hydraulic cylinder 5 is set as the fourth servo valve.

[0065] For the two position detection devices 2 arranged at the left and right ends of the upper roller 32, the position sensor 24 for detecting the left end position of the upper roller 32 is set as the left position sensor, and the position sensor 24 for detecting the right end position of the upper roller 32 is set as the right position sensor, and the two hydraulic cylinders 5 are located between the left position sensor and the right position sensor.

[0066] In the above step S1, the position sensor collects the upper roller position data when the dummy rod is replaced each time the straightening machine changes the section, and the real-time position data of the upper roller is sent to the host computer 1. According to the formula S 测 =S0+(K×V x ×t-L0), establish the upper roller position monitoring model of the tension and straightening system, where S 测 is the data collected by the position sensor, S0 is the given value of the initial straight section position of the dummy bar, K is the slope of the dummy bar, V x are respectively the casting speeds of different sections, t is the casting time, and L0 is the length of the straight section 41 of the dummy bar.

[0067] In addition, S 测 =(S 左 +S 右 ) / 2, S 左 is the value of the left position sensor, S 右The calculation result is displayed through an instrument display box arranged on site for the right position sensor value.

[0068] The step S2 comprises:

[0069] S201, setting the initial value of the upper roll position of the stretch leveler as S 测1 =S max , i.e. S 测1 = the maximum opening value; the control system given value of the stretch leveler when not pressed is S 测1 ;

[0070] S202, setting the control system given value of the stretch leveler when the straight section 41 of the dummy bar is pressed during the roll replacement of the continuous casting machine as S 测2 =S0, S0 being the given value of the initial straight section position of the dummy bar;

[0071] S203, setting the standard position calculation model when the roll gap of the stretch leveler is fully opened and the straight section 41 of the dummy bar is clamped, the standard position calculation model S 标max =S 测1 , S 标min =S0;

[0072] S204, setting the maximum opening value of the stretch leveler as S 标max , and setting the straight section pressing value of the dummy bar as S 标min , the straight section pressing value of the dummy bar being the opening value of the stretch leveler when the upper roll is pressed after the straight section of the dummy bar enters between the upper roll and the lower roll.

[0073] In the step S2, S 标min ≤S 测左 ≤S 标max ; S 标min ≤S 测右 ≤S 标max ; T max ≯5 seconds, S 测左 being the value of the left position sensor, S 测右 being the value of the right position sensor, and T max being the longest execution time of the instruction.

[0074] When S 测左 >S 测右 , the control module issues an instruction, the first servo valve starts to start, and hydraulic oil is provided to the rodless cavity of the hydraulic cylinder arranged on the left, and the hydraulic cylinder is elongated;

[0075] When S S测左 =S 测右 , the control module issues an instruction, and the first servo valve and the second servo valve are both closed;

[0076] When S 测右 >S 测左, the control module sends an instruction, the second servo valve starts to actuate, and hydraulic oil is supplied to the rodless chamber of the hydraulic cylinder arranged on the right side, and the hydraulic cylinder is elongated;

[0077] more than 5 seconds, S 测左 ≠ S 测右 , the control module sends an instruction, the first servo valve and the second servo valve are closed and an alarm is given, and manual on-site confirmation is awaited.

[0078] The above step S3 comprises:

[0079] S301, after calibration, the low position value S 低 of the upper roller working position and the high position value S 高 of the upper roller working position are collected;

[0080] S302, set the data collection period of the upper roller working position to n seconds;

[0081] S303, calculate the real-time value S x of the roll gap, that is, determine the working position of the upper roller, the real-time value S x of the roll gap is the distance between the upper roller and the lower roller, S x = (S 高 -S 低 ) / T×n, wherein T is the time required for the slope section of the broken-section dummy bar to pass through the moving upper roller of the stretch leveler;

[0082] S304, calculate the position rising value △S n every n seconds, △S n =S n+1 -S n , n is a positive integer, n=1, 2, 3, …;

[0083] S305, by comparing △S n and S x , according to the comparison result, select the corresponding control strategy to realize the control of the hydraulic cylinder execution action.

[0084] In the above step S3, the control strategy is as follows:

[0085] When △S n ≤ S x , the hydraulic cylinder reversing valve is reversed, the third servo valve and the fourth servo valve are opened, hydraulic oil enters the rod chamber of the two hydraulic cylinders, the hydraulic cylinder is contracted, the hydraulic cylinder lifting action is enabled, and the upper roller is pulled to move upward;

[0086] When △S n > S x , the hydraulic cylinder reversing valve is reversed, the first servo valve and the second servo valve are opened, hydraulic oil enters the rodless chamber of the two hydraulic cylinders, the hydraulic cylinder is elongated, the hydraulic cylinder pressing action is enabled, and the upper roller is pushed to move downward;

[0087] If △S n+1 >S x , △S n+2 >S x , △S n+3 >S x ,

[0088] △S n+1 is the upper roll position rising value per n+1 second, △S n+2 is the upper roll position rising value per n+2 second, △S n+3 is the upper roll position rising value per n+3 second, △S n+1 , △S n+2 , △S n+3 is the upper roll position rising value for three times in succession, then the control module issues an instruction to urgently close the reversing valve, and the dummy bar stops being pulled down until the problem is found manually, and the control module starts counting again.

[0089] If △S n+1 >S x , the hydraulic cylinder reversing valve is reversed, the first servo valve and the second servo valve are opened, hydraulic oil enters the rodless cavity of the two hydraulic cylinders, the hydraulic cylinder is elongated, the hydraulic cylinder pressing action is enabled, and the upper roll is pushed to move downward.

[0090] In the present application, the valve switching of the rod cavity and the rodless cavity of the double hydraulic cylinders of the pinch roll 4 and the stretch leveler 5 in the 1#, 2#, 3# and 4# casting flow must meet the requirements of the stretch leveler position control logic diagram as shown in Figure 10 .

[0091] When the hydraulic cylinder reversing valve and the servo valve are operated by adopting the scheme of the present application, the position is linear and stable from the straight section to the peak value, thereby reducing the impact load of the dummy bar on the stretch leveler and reducing the fatigue damage of the equipment.

[0092] The stretch leveler position detection and break face position linear control system and the use method thereof have the following advantages:

[0093] (1) The stretch leveler position detection and break face position linear control system of the present application is provided with a position monitoring unit, which transmits the detected signals to an instrument display box through a laser position sensor, and then sends them into a control system, the control system calculates the current position through a built-in PLC control model, intelligently analyzes, controls the hydraulic cylinder reversing valve to reverse, and switches the rod cavity and the rodless cavity servo valve, thereby realizing intelligent linear control of the break face position and basically eliminating the bottleneck problem of the out-of-sync of the double hydraulic cylinder driven stretch leveler.

[0094] (2) The linear control system method for position detection and section change position of the straightening machine, aiming at the straightening system of the large-section continuous casting machine, detects the running position data of the upper roll of the straightening machine in real time through a laser position sensor, establishes an upper roll position monitoring model of the straightening system and an intelligent linear lifting adjustment model of the section change position, accurately adjusts the running process of the valve switching of the section change hydraulic cylinder and the servo valve, effectively controls the position fluctuation of the upper roll generated by the section change, and improves the accuracy and reliability of the position control.

[0095] Embodiment one

[0096] Applied to the scene of changing 700mm section to 800mm section of the continuous casting machine: the straightening system of the continuous casting machine includes a four-flow parallel straightening system, each flow has 4 pinch roll devices and 9 straightening machine systems, completes the conversion of 700mm to 800mm section, the pulling speed of the 700mm section is 0.2m / min, and the pulling speed of the 700mm section is 0.16m / min. After the section change is completed, the 800mm section is set, and when the big end of the dummy bar enters the straightening machine, S 测 Compared with S0+ (KxV x xt-L0). Avoid incorrect adjustment of the upper roll position, and cause overload damage to the straightening machine due to excessive force.

[0097] Embodiment two

[0098] Applied to the scene of changing 700mm section to 800mm section of the continuous casting machine: the straightening system of the continuous casting machine includes a four-flow parallel straightening system, each flow has 4 pinch roll devices and 9 straightening machine systems, completes the conversion of 700mm to 800mm section, the pulling speed of the 700mm section is 0.2m / min, and the pulling speed of the 700mm section is 0.16m / min. After the section change is completed, the 800mm section is set, and when the big end of the dummy bar enters the straightening machine, S 右 >S 左 , through intelligent control operation, the oil cylinder control reversing valve action realizes balance adjustment. Avoid damage to the straightening machine slide caused by the skew of the upper roll, and damage to the oil cylinder caused by the skew.

[0099] Embodiment three

[0100] Applied to the scene of changing 800mm section to 900mm section of the continuous casting machine: the straightening system of the continuous casting machine includes a four-flow parallel straightening system, each flow has 4 pinch roll devices and 9 straightening machine systems, completes the conversion of 800mm to 900mm section, the pulling speed of the 800mm section is 0.16m / min, and the pulling speed of the 700mm section is 0.12m / min. After the section change is completed, the 900mm section is set, and when the straight section of the dummy bar enters the straightening machine, S 右 >S 左 , through intelligent control operation, the oil cylinder control reversing valve action realizes balance adjustment. Avoid damage to the straightening machine slide caused by the skew of the upper roll, and damage to the oil cylinder caused by the skew. max> 5s, protection action, confirmed by the scene to exclude malfunction, avoid over-adjustment caused by the damage of the straightening machine.

[0101] Example Four

[0102] Applied to the scene of 900mm to 1000mm section of continuous casting machine: the continuous casting machine straightening system includes four parallel straightening systems, each flow has four pinch roll devices and nine straightening machine systems, which completes the conversion of 900mm to 1000mm section, the 900mm section casting speed is 0.12m / min, and the 1000mm section casting speed is 0.11m / min. After the section conversion, the 1000mm section is set, the big end of the dummy bar enters the straightening machine, S 右 =S 左 =S max =1000mm, through intelligent control operation, the reliable control of the oil cylinder control servo valve is realized, and the normal billet casting closed-loop control state is entered.

[0103] The above describes the present application in conjunction with the drawings. Obviously, the specific implementation of the present application is not limited by the above method. As long as various non-essential improvements are made by using the method concept and technical solution of the present application; or without improvement, the above concept and technical solution of the present application are directly applied to other occasions, which are within the protection scope of the present application.

Claims

1. The use of a position detection and linear control system for a section changing position of a tension leveller, characterised in that, The position detection and linear control system for the position of the section change of the straightening machine comprises a position detection device and a control module, the position detection device comprises a position sensor for collecting the position data of the upper roller of the straightening machine during the process of the ingot rod drawing, the upper roller is connected with a hydraulic cylinder, the position sensor is electrically connected with the control module, the control module establishes the position monitoring model of the upper roller of the straightening system and the intelligent linear lifting adjustment model for the position of the section change according to the data transmitted by the position sensor, and the control of the hydraulic cylinder is realized; The use method of the position detection and linear control system for the position of the section change of the straightening machine comprises the following steps: S1, establishing the position monitoring model of the upper roller of the straightening system; S2, calibrating the position monitoring values of the straightening system; S3, performing the linear control of the position of the section change of the straightening machine, and adjusting the operation process of the oil supply valve of the hydraulic cylinder; The step S3 comprises: S301、complete calibration, collect the upper roller working position low value S 低 and the upper roller working position high value S 高 ; S302, setting the data collection period of the working position of the upper roller as n seconds; S303, calculate the roll gap real-time value S x , S x = (S 高 -S 低 ) / T×n, wherein T is the time required for the slope section of the break-face dummy bar to pass through the moving roller of the stretch leveler S304、Calculate the position rising value △S every n seconds n , △S n = S n+1 -S n , n is a positive integer; S305, by comparing △S n and S x ,According to the comparison results, the corresponding control strategy is selected to realize the control of the hydraulic cylinder’s execution action; In the step S3, the control strategy is as follows: When ΔS n ≤ S x , the hydraulic cylinder reversing valve reverses, the third servo valve and the fourth servo valve open, hydraulic oil enters the rod cavity of the two hydraulic cylinders, the hydraulic cylinders retract, the hydraulic cylinder lifting action is enabled, and the upper roller is pulled to move upward; When ΔS n > S x , the hydraulic cylinder reversing valve reverses, the first servo valve and the second servo valve open, hydraulic oil enters the rodless cavity of the two hydraulic cylinders, the hydraulic cylinders are elongated, the hydraulic cylinder pressing action is enabled, and the upper roller is pushed to move downward; If △S n+1 >S x , △S n+2 >S x , △S n+3 >S x , △S n+1 △S is the rise value of the upper roller position every n+1 seconds n+2 △S is the rise value of the upper roller position every n+2 seconds n+3 △S is the rise value of the upper roller position every n+3 seconds n+1 , △S n+2 , △S n+3 If the upper roller rises three times in a row, the control module will issue a command to close the reversing valve urgently, and the dummy bar will stop pulling down until the problem is manually found. The control module will then start counting again. If ΔS n+1 > S x , the hydraulic cylinder reversing valve reverses, the first servo valve and the second servo valve open, hydraulic oil enters the rodless chambers of the two hydraulic cylinders, the hydraulic cylinders are elongated, the hydraulic cylinder pressing action is enabled, and the upper roller is pushed to move downward.

2. The method of using a position detection and gauge length linear control system for a puller straightener as defined in claim 1, wherein, In the step S1, the position sensor collects the upper roll position data at each time of changing the section of the drawing straightening machine and replacing the dummy bar, and a position monitoring model S is established 测 =S0+ (K x V x x t-L0), wherein S 测 is the data collected by the position sensor, S0 is a given value of the initial straight section position of the dummy bar, K is the slope of the dummy bar, V x is the casting speed at different sections, t is the casting time, and L0 is the length of the straight section of the dummy bar.

3. The method of using a position detection and gauge length linear control system for a puller straightener as defined in claim 1, wherein, The step S2 comprises: S201, set the initial value of the upper roll position of the stretcher leveler as S 测1 =S max , i.e. S 测1 = the maximum opening value; S202, when the pull-straightening machine is in the straight section of the dummy bar at the time of roll change of the continuous caster, the control system gives a value of S 测2 =S0, S0 being an initial cross-section given value; S203, set the full open state of the roll gap of the straightening machine and the standard position calculation model when the stub shaft straight section is clamped, the standard position calculation model S 标max =S 测1 , S 标min = S0; S204, calibration of the straightening press 标max Calibration of the full opening value, in S 标min Calibration of the straight section reduction value.

4. The method of using a position detection and gauge length linear control system for a puller straightener as defined in claim 1, wherein, The hydraulic cylinder is provided with two, and the position detection device is also provided with two, and the two position detection devices are respectively located at the two ends of the upper roller.

5. The method of using a position detection and gauge length linear control system for a puller straightener as defined in claim 1, wherein, The position detection device further comprises a measurement reference seat, an upper sensor base and a lower base, the position sensor is arranged on the lower base, the lower base is arranged on the measurement reference seat, the upper sensor base is located above the lower base, and the measurement reference seat is arranged on the upper roller.

6. The method of using a position detection and gauge length linear control system for a puller straightener as defined in claim 5, wherein, The upper sensor base is installed on the upper beam of the frame through first bolts, the position sensor is installed on the lower base through second bolts, and the lower base is installed on the measurement reference seat through third bolts.

7. The method of using a position detection and gauge length linear control system for a puller straightener as defined in claim 6, wherein, The lower base is provided with a second mounting hole for the second bolts to pass through and a third mounting hole for the third bolts to pass through, and the second mounting hole and the third mounting hole are waist-shaped holes.

8. The method of using a position detection and gauge length linear control system for a straightener according to any one of claims 1 to 7, wherein, The position sensor is a laser ranging sensor.

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