CN111744970A - Device and method for detecting lower step position of hot continuous rolling mill - Google Patents
Device and method for detecting lower step position of hot continuous rolling mill Download PDFInfo
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- CN111744970A CN111744970A CN201910237364.4A CN201910237364A CN111744970A CN 111744970 A CN111744970 A CN 111744970A CN 201910237364 A CN201910237364 A CN 201910237364A CN 111744970 A CN111744970 A CN 111744970A
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Abstract
The invention discloses a device and a method for detecting the lower step position of a hot continuous rolling mill, wherein the device comprises an electromagnetic valve (1), a flow detection sensor (5), a hydraulic oil cylinder (6), a lower supporting roller base (7), a lower step base plate (8), a lower supporting roller lifting oil cylinder (9) and a push-pull rod (10); the flow detection sensor is arranged in the hydraulic oil cylinder, the flow detection sensor is externally connected with a control system, the control system is connected with an electromagnetic valve, and the electromagnetic valve is connected with the hydraulic oil cylinder through a protection mechanism; the push-pull rod is arranged on the lower supporting roller base and connected with the lower step backing plate, the hydraulic oil cylinder is arranged in the lower supporting roller base and connected with the push-pull rod, and the lower step backing plate moves integrally through the push-pull rod through the hydraulic oil cylinder. According to the invention, the hydraulic flow value in the operation process of the lower step base plate is controlled by the flow detection sensor, the stroke position calibration is adopted, and a calculation model for detecting the position of the oil cylinder is established by combining a PLC control system, so that the action stability of the lower step base plate is effectively improved.
Description
Technical Field
The invention relates to a device and a method for adjusting the height of a rolling line of a hot continuous rolling mill, in particular to a device and a method for detecting the lower step position of the hot continuous rolling mill.
Background
In the prior art, the function of the lower step base plate of the hot continuous rolling mill is mainly to adjust the height of a rolling line, so that the height of the rolling line is automatically adjusted according to the change of the roll diameter of a roll. The following two functions are mainly provided: 1. controlling the height deviation of the rolling line of the finishing mill within the deviation range of the theoretical rolling line; 2. the roll line inclination of the finishing mill can be freely adjusted by operators according to special process requirements.
Referring to fig. 1, the hot continuous rolling mill in the prior art mainly includes a lower step pad oil cylinder 100, a lower working roll 200, a lower support roll 300, a rolling mill base 400, a built-in magnetic displacement sensor 500, a transmission side lower step pad 600 and a working side lower step pad 700. The driving side lower step base plate 600 and the working side lower step base plate 700 are coupled in a frame to form a lower step base plate, and the lower step base plate moves synchronously through the lower step base plate oil cylinder 100 and is detected through the built-in magnetic displacement sensor 500. The horizontal plane of the roll surface of the lower working roll 200 is the actual height of the rolling line, and the height of the lower step bolster is increased or reduced through the adjustment of the lower step bolster oil cylinder 100, so that the height of the rolling line is controlled.
In the prior art, the built-in magnetic displacement sensor 500 arranged on the piston rod of the lower step base plate oil cylinder 100 is used for detecting the action stroke of the lower step base plate oil cylinder 100, the detection principle is obtained by calculating the displacement generated between a detection magnetic ring arranged inside the piston rod and a detection ruler of the displacement sensor, and the core principle is torsion wave detection using Wednman effect. Although the method has high precision and simple structure, in the rolling process, the built-in magnetic displacement sensor 500 installed in the cylinder piston rod is easy to damage due to the extremely high impact on the lower step base plate cylinder 100 at the moment of biting and throwing steel, the use failure rate is extremely high, and the durability and the reliability are poor.
Because the lower step base plate needs to be automatically positioned and controlled for 2 times in each roll changing process, if the built-in magnetic displacement sensor 500 is damaged, the control system cannot automatically judge the position of the lower step base plate oil cylinder 100, and further cannot determine the actual rolling line height. Meanwhile, as the lower step base plate oil cylinder 100 is arranged below the lower supporting roller 300, personnel cannot judge the effective position by naked eyes, and once the feedback data of the built-in magnetic displacement sensor 500 abnormally jumps, the automatic roller change is interrupted, the height of the rolling line cannot be reliably and effectively determined, so that the rolling line must be stopped.
The Chinese patent invention CN201510814728.2 discloses a device and a method for rapidly detecting the position of a lower step pad of a rolling mill, the device comprises a scale rod and a fixed pipe clamp, the front end of the scale rod is connected with the fixed pipe clamp in a configuration mode, a plurality of stage reading parts are uniformly arranged on the scale rod at intervals, the number of the stage reading parts corresponds to the number of stages of the lower step pad, and the number of the stages of the lower step pad is determined by observing the number of the stage reading parts. The device has lower position detection precision on the lower step base plate, and is not suitable for being popularized and applied on a finishing mill.
Disclosure of Invention
The invention aims to provide a device and a method for detecting the lower step position of a hot continuous rolling mill.
The invention is realized by the following steps:
a detection device for the lower step position of a hot continuous rolling mill comprises an electromagnetic valve, a lower support roller base, a lower step base plate and a lower support roller lifting oil cylinder; the lower step base plate is arranged on the lower support roller base and consists of 2 same multistage step base plates which integrally move; the lower supporting roller is arranged on a lower supporting roller base through a lower supporting roller lifting oil cylinder;
the detection device also comprises a flow detection sensor, a hydraulic oil cylinder and a push-pull rod; the flow detection sensor is arranged in a connecting pipeline of the hydraulic oil cylinder, the output end of the flow detection sensor is externally connected with the control system, the output end of the control system is connected with the input end of the electromagnetic valve, and the output end of the electromagnetic valve is connected with the hydraulic oil cylinder through the protection mechanism; the push-pull rod is arranged on the lower supporting roll base, one end of the push-pull rod is connected with the lower step base plate through a connecting plate, one end of the hydraulic oil cylinder is arranged in the lower supporting roll base and is connected with the other end of the push-pull rod, and the lower step base plate moves integrally through the push-pull rod through the hydraulic oil cylinder.
The protection mechanism comprises a system pressurizer and a one-way speed limiting valve, and the system pressurizer comprises two pressure control check valves; one pressure control check valve is connected with the one-way speed limiting valve in series and then is connected between the electromagnetic valve and the flow detection sensor in series as an independent hydraulic passage, and the other pressure control check valve is connected between the electromagnetic valve and the flow detection sensor as an independent hydraulic passage.
And a temperature compensation flow regulating valve is arranged between the two hydraulic passages and the flow detection sensor.
The control system comprises a PLC and an upper computer, the output end of the flow detection sensor is connected with the PLC through the upper computer, and the output end of the PLC is connected with the electromagnetic valve.
A method for detecting the position of a lower step of a hot continuous rolling mill comprises the following steps:
step 1: in the roll changing process of the hot continuous rolling mill, the lower support roll lifting oil cylinder is lifted, so that the electromagnetic valve is electrified to act;
step 2: the electromagnetic valve controls the hydraulic oil cylinder to move forwards towards the lower supporting roller base;
and step 3: the hydraulic oil cylinder controls the lower step base plate to move, the flow automatic position positioning is started, the current stroke distance S of the piston rod of the oil cylinder is calculated through the control system, and the calculation formula is as follows:
S=PL×C
wherein, PLThe pulse resolution of the flow detection sensor, and C the pulse number of the current stroke;
and 4, step 4: the control system outputs the current detection position quantity of the lower step base plate for the actual position feedback and automatic control of the hydraulic oil cylinder.
The step 3 comprises the following steps:
step 3.1: when the hydraulic oil cylinder controls the lower step base plate to move to the highest position in the support roller base, the maximum stroke position of the piston rod of the oil cylinder is calibrated to be X through the flow detection sensormaxAnd recording the maximum stroke pulse number of the piston rod of the oil cylinder as Cmax；
Step (ii) of3.2: when the hydraulic oil cylinder controls the lower step base plate to move to the lowest position in the support roller base, the minimum stroke position of the piston rod of the oil cylinder is calibrated to be X through the flow detection sensorminAnd recording the minimum stroke pulse number of the piston rod of the oil cylinder as Cmin；
Step 3.3: calculating pulse resolution P of flow sensing sensorLThe calculation formula is as follows:
PL=（Xmax-Xmin）/（Cmax-Cmin）
wherein, XmaxThe maximum stroke position of the piston rod of the oil cylinder;
Xminthe minimum stroke position of the piston rod of the oil cylinder;
Cmaxthe maximum stroke pulse number of the piston rod of the oil cylinder;
Cminthe minimum stroke pulse number of the piston rod of the oil cylinder;
step 3.4: the control system comprises a PLC and an upper computer, the upper computer calculates the current stroke distance S of the piston rod of the oil cylinder and feeds a distance signal back to the PLC, and the calculation formula is as follows:
S=PL×C
wherein, PL isThe pulse resolution of the flow detection sensor, C is the pulse number of the current stroke;
step 3.5: and the feedback signal enters the PLC through an I/O board card of the PLC for decoding analysis and program processing.
Compared with the prior art, the invention has the following beneficial effects:
1. the flow detection sensor is arranged in the connecting pipeline of the hydraulic oil cylinder to carry out closed flow detection, is less influenced by the external environment, has low failure rate and is suitable for being used in severe environment.
2. The invention adopts the flow detection sensor to calibrate and detect data, the calculation precision can reach 0.01mm, the distance precision and the control precision are higher than those of other sensors, the invention is suitable for detecting the position of the base plate with frequent action, and particularly has wider application space for detecting the position of the base of the hot rolling mill, thereby having wide popularization and application prospect.
3. The invention adopts double-position reference calibration, has high detection efficiency and accurate positioning, can realize automatic calibration and reduce manual intervention.
According to the invention, the hydraulic flow value in the running process of the lower step base plate is controlled by the flow detection sensor, the stroke position calibration is adopted, and the calculation model of the oil cylinder position detection is established by combining the PLC control system, so that the action stability of the lower step base plate is effectively improved, and the method has great significance for improving the unplanned shutdown caused by the fault of the rolling line sensor in the finish rolling roll changing process.
Drawings
FIG. 1 is a front view of a hot continuous rolling mill of the prior art;
FIG. 2 is a plan view of the detecting device for the lower step position of the hot continuous rolling mill of the present invention;
FIG. 3 is a schematic view of the detection of the lower step position detecting device of the hot continuous rolling mill according to the present invention;
FIG. 4 is a control schematic diagram of the detection device for the lower step position of the hot continuous rolling mill of the present invention;
FIG. 5 is a flowchart of the method for detecting the step down position of the hot continuous rolling mill according to the present invention;
FIG. 6 is a flow chart showing the steps of the method for detecting the step position of the hot continuous rolling mill according to the present invention.
In the figure, a 100 lower stepped backing plate oil cylinder, a 200 lower working roll, a 300 lower supporting roll, a 400 rolling mill base, a 500 built-in magnetic displacement sensor, a 600 transmission side lower stepped backing plate, a 700 working side lower stepped backing plate, a1 electromagnetic valve, a 2 system pressurizer, a 21 pressure control check valve, a 3 one-way speed limiting valve, a 4 temperature compensation flow regulating valve, a 5 flow detection sensor, a 6 hydraulic oil cylinder, a 7 lower supporting roll base, an 8 lower stepped backing plate, a 9 lower supporting roll lifting oil cylinder, a 10 push-pull rod, a 14 PLC and a15 upper computer.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 2 and 3, the device for detecting the lower step position of the hot continuous rolling mill comprises an electromagnetic valve 1, a flow detection sensor 5, a hydraulic oil cylinder 6, a lower support roller base 7, a lower step base plate 8, a lower support roller lifting oil cylinder 9 and a push-pull rod 10; the lower step base plate 8 is arranged on the lower support roller base 7, and the lower step base plate 8 consists of 2 same multistage step base plates and moves integrally; the lower supporting roller is installed on the lower supporting roller base 7 through the lower supporting roller lifting oil cylinder 9, preferably, the lower supporting roller lifting oil cylinder 9 can be provided with 8 lower supporting roller lifting oil cylinders and symmetrically distributed on two sides of the lower step base plate 8, and is used for lifting the lower supporting roller and separating a lower supporting roller bearing seat from the lower step base plate 8, so that the height of the lower step base plate 8 is adjusted.
The flow detection sensor 5 is arranged in a connecting pipeline of the hydraulic oil cylinder 6, the stability and the damage rate of the flow detection sensor are relatively low compared with other sensing equipment, the output end of the flow detection sensor 5 is externally connected with a control system, the output end of the control system is connected with the input end of the electromagnetic valve 1, and the output end of the electromagnetic valve 1 is connected with the hydraulic oil cylinder 6 through a protection mechanism; the push-pull rod 10 is arranged on the lower supporting roller base 7, one end of the push-pull rod 10 is connected with the lower step base plate 8 through a connecting plate, one end of the hydraulic oil cylinder 6 is arranged in the lower supporting roller base 7 and is connected with the other end of the push-pull rod 10, the hydraulic oil cylinder 6 serves as a power source for driving the lower step base plate 8, and the lower step base plate 8 moves integrally through the push-pull rod 10 through the hydraulic oil cylinder 6 to reach the required height of the lower step base plate 8.
Preferably, the flow detecting sensor 5 can adopt a gear flowmeter in the prior art, and the principle is as follows: when fluid passes through the flow sensor 5, a certain pressure difference is generated between the inlet and the outlet of the flow sensor 5, and a rotating component (i.e., a rotor) of the flow sensor 5 rotates under the action of the pressure difference, so that the fluid is discharged from the inlet to the outlet. The spatial volume of the flow rate detection sensor 5 is determined, and a cumulative value of the volume of the fluid passing through the flow rate detection sensor 5 can be obtained as long as the number of rotations of the rotor is measured. The flow detection sensor 5 detects the flow of the hydraulic oil cylinder 6, so that the walking distance of the hydraulic oil cylinder 6 is calculated to realize automatic control.
The protection mechanism comprises a system pressurizer 2 and a one-way speed limiting valve 3, wherein the system pressurizer 2 comprises two pressure control check valves 21; one pressure control check valve 21 is connected in series with the one-way speed limiting valve 3 and then connected in series between the electromagnetic valve 1 and the flow detection sensor 5 as an independent hydraulic passage, and the other pressure control check valve 21 is connected between the electromagnetic valve 1 and the flow detection sensor 5 as an independent hydraulic passage. The system pressure maintaining device 2 realizes system pressure maintaining in a stop state through two pressure control check valves 21 and is used for preventing the hydraulic oil cylinder 6 from moving; the one-way speed limiting valve 3 performs one-way flow limitation on the rodless cavity and is used for controlling the advancing speed of the hydraulic oil cylinder 6.
Temperature compensation flow regulating valves 4 are arranged between the two hydraulic passages and the flow detection sensor 5, and flow is compensated by the two temperature compensation flow regulating valves 4 in the field actual position under different temperature environments so as to keep the moving speed of the hydraulic oil cylinder 6 constant.
Referring to fig. 4, preferably, the control system includes a PLC 14 (programmable logic controller) and an upper computer 15, an output end of the flow rate detection sensor 5 is connected to the PLC 14 through the upper computer 15, and an output end of the PLC 14 is connected to the solenoid valve 1. The position setting of the lower step backing plate 8 in the roll changing process is calculated and issued by an upper computer 15 (mainly relating to the roll diameter change of a working roll to adjust the height of a rolling line within a normal range), and the automatic PLC 14 realizes the positioning of the on-site hydraulic oil cylinder 6 through automatic positioning control and ensures the positioning precision of the on-site hydraulic oil cylinder.
Referring to fig. 5, a method for detecting the step position of a hot continuous rolling mill includes the following steps:
step 1: in the roll changing process of the hot continuous rolling mill, the lower support roll lifting oil cylinder 9 is lifted, so that the electromagnetic valve 1 is electrified to act, a detection in-place signal is generated after the lower support roll lifting oil cylinder 9 is lifted in place, and a control system of the hot continuous rolling mill controls the electromagnetic valve 1 to be electrified according to the detection in-place signal.
Step 2: the electromagnetic valve 1 controls the hydraulic oil cylinder 6 to move forwards towards the lower supporting roller base 7, and the action time of the hydraulic oil cylinder 6 is t and the unit is second(s).
And step 3: the hydraulic oil cylinder 6 controls the lower step base plate 8 to move, flow automatic position positioning (APC) is started, and the current stroke distance S (namely the dynamic pulse distance of the oil cylinder piston) of the oil cylinder piston rod is calculated through the control system according to the automatic position positioning information.
The action process adopts double-position automatic calibration, namely, the double positions are calibrated by adopting the flow detection sensor 5 according to the fixed point of the step at the advancing position (namely the maximum stroke position of the piston rod of the oil cylinder) and the fixed point of the retreating position (namely the minimum stroke position of the piston rod of the oil cylinder), thereby realizing dynamic pulse position control and counting the pulse number of the current action stroke of the flow detection sensor 5. The specific calculation steps are as follows:
please refer to fig. 6, step 3.1: when the hydraulic oil cylinder 6 controls the lower step base plate 8 to move to the highest position in the supporting roller base 7, the maximum stroke position of the piston rod of the oil cylinder is calibrated to be X through the flow detection sensor 5maxUnit is millimeter (mm), and the maximum stroke pulse number of the piston rod of the oil cylinder is recorded as Cmax. The highest position can also be marked as the maximum travel position Xmax。
Step 3.2: when the hydraulic oil cylinder 6 controls the lower step base plate 8 to move to the lowest position in the supporting roller base 7, the minimum stroke position of the piston rod of the oil cylinder is calibrated to be X through the flow detection sensor 5minUnit is millimeter (mm), and the minimum stroke pulse number of the piston rod of the oil cylinder is recorded as Cmin. In step 3, two calibrated positions are adopted, namely the maximum travel position is XmaxAnd the minimum stroke position is XminAnd the distance between the two calibration positions and the pulse number are measured as calculation basis, so that errors such as system clearance and the like generated by directly adopting the highest position and the lowest position as the calculation basis can be eliminated.
Step 3.3: the flow rate detecting sensor 5 sets the maximum stroke position to XmaxMaximum stroke pulse number CmaxThe minimum stroke position is XminMinimum stroke pulse number CminSending the data to an upper computer 15, and calculating the pulse resolution P of the flow detection sensor by the upper computer 15LThe calculation formula is as follows:
PL=（Xmax-Xmin）/（Cmax-Cmin）
wherein, XmaxThe maximum stroke position of the piston rod of the oil cylinder;
Xminthe minimum stroke position of the piston rod of the oil cylinder;
Cmaxthe maximum stroke pulse number of the piston rod of the oil cylinder;
Cminthe minimum stroke pulse number of the piston rod of the oil cylinder;
step 3.4: the control system comprises a PLC 14 and an upper computer 15, the current stroke distance S of the piston rod of the oil cylinder is calculated through the upper computer 15, and a distance signal is fed back to the PLC 14, and the calculation formula is as follows:
the current stroke distance S = P of the oil cylinder piston rodL×C
Wherein, PLC is the number of pulses of the current stroke for the pulse resolution of the flow rate detecting sensor 5.
Step 3.5: the feedback signal enters the PLC 14 through an I/O board card of the PLC 14 for decoding analysis and program processing.
And 4, step 4: the PLC 14 outputs the current detection position quantity of the lower step base plate 8, the unit is millimeter (mm), and the current detection position quantity is used for actual position feedback and automatic control of the hydraulic oil cylinder 6.
The automatic control method of the control system by using the action stroke position of the hydraulic oil cylinder 6 as the feedback of the position of the lower step base plate 8 is as follows: because the detection result may have a certain deviation under the influence of factors such as temperature, the detection result needs to be calibrated regularly, and the measurement result can be optimized by combining the measurement result of the magnetostrictive instrument and the actual position on site in a continuous compensation mode, namely, the deviation compensation caused by external factors such as temperature is further carried out on the control precision according to the relationship between the theoretical walking distance H and the actual walking distance HS. Meanwhile, a measurement database at different temperatures is established, and the measurement accuracy is judged according to historical data and the measurement result of the extensometer.
In the process of replacing the working roll of a certain hot continuous rolling mill, the step-down position detection is combined with the step-down position detection method as follows:
1. the supporting roller lifting oil cylinder acts, and a pressure sensor feedback signal G-FSTBUR-LFT-UP-ON is adopted to detect that the lower supporting roller lifting oil cylinder 9 rises to the right position;
2. and the lower supporting roller lifting oil cylinder 9 is lifted to the right position, so that the electromagnetic valve 1 is electrified, and the electrified signal of the electromagnetic valve 1 is G-FSWRCHGSI-PLA15 ON.
3. After the lower step backing plate 8 advances to the maximum position Fx PLA-auxx, the maximum position in this embodiment is 2280mm, and the lower step backing plate 8 moves to the minimum position.
4. The maximum travel position is marked as G-FLM-4509-POS, namely 2280mm position; minimum stroke position XminThe 0mm position is designated;
5. the PLC 14 starts a program function block CM-7-PP11G-2-4 to automatically position the flow APC;
6. incorporating the present embodiment
2280mm, 0, and detecting the maximum stroke pulse number C of the piston rod of the oil cylindermax287035, the minimum stroke pulse number C of the piston rod of the oil cylinderminTo 59041, the upper computer 15 calculates the pulse resolution P according to the formulaL=（Xmax-Xmin）/（Cmax-Cmin）=（2280-0）/（287035-59041）≈0.01；
7. When the current action distance is 816mm, detecting that the corresponding oil cylinder action stroke feedback pulse number C is 81649, and calculating the current action stroke distance =0.1 × 81649 ≈ 816.5 mm;
8. and entering a program function block CM-7-PP11G-2-4, and then performing automatic positioning control on the position of the secondary flow APC.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A detection device for the lower step position of a hot continuous rolling mill comprises an electromagnetic valve (1), a lower support roller base (7), a lower step base plate (8) and a lower support roller lifting oil cylinder (9); the lower step base plate (8) is arranged on the lower supporting roller base (7), and the lower step base plate (8) consists of 2 same multistage step base plates and moves integrally; the lower supporting roller is arranged on a lower supporting roller base (7) through a lower supporting roller lifting oil cylinder (9);
the method is characterized in that: the detection device also comprises a flow detection sensor (5), a hydraulic oil cylinder (6) and a push-pull rod (10); the flow detection sensor (5) is arranged in a connecting pipeline of the hydraulic oil cylinder (6), the output end of the flow detection sensor (5) is externally connected with a control system, the output end of the control system is connected with the input end of the electromagnetic valve (1), and the output end of the electromagnetic valve (1) is connected with the hydraulic oil cylinder (6) through a protection mechanism; the lower support roller supporting device comprises a lower support roller base (7), a push-pull rod (10), a lower step base plate (8), a hydraulic oil cylinder (6), a lower support roller base (7), a push-pull rod (10), a lower step base plate (8), a hydraulic oil cylinder (6) and a push-pull rod (10), wherein the push-pull rod (10) is arranged on the lower support roller base (7), one end of the hydraulic oil cylinder is connected with the other end of the push-pull rod (10), and the lower step base plate (8) moves integrally.
2. The apparatus for detecting the position of the lower step of the hot continuous rolling mill as set forth in claim 1, wherein: the protection mechanism comprises a system pressurizer (2) and a one-way speed limiting valve (3), wherein the system pressurizer (2) comprises two pressure control check valves (21); one pressure control check valve (21) is connected with the one-way speed limiting valve (3) in series and then is connected between the electromagnetic valve (1) and the flow detection sensor (5) in series as an independent hydraulic passage, and the other pressure control check valve (21) is connected between the electromagnetic valve (1) and the flow detection sensor (5) as an independent hydraulic passage.
3. The apparatus for detecting the position of the lower step of the hot continuous rolling mill as set forth in claim 2, wherein: and a temperature compensation flow regulating valve (4) is arranged between the two hydraulic passages and the flow detection sensor (5).
4. The apparatus for detecting the position of the lower step of the hot continuous rolling mill as set forth in claim 1, wherein: the control system comprises a PLC (14) and an upper computer (15), the output end of the flow detection sensor (5) is connected with the PLC (14) through the upper computer (15), and the output end of the PLC (14) is connected with the electromagnetic valve (1).
5. A method for detecting the position of the lower step of the hot continuous rolling mill according to claim 1, comprising the steps of: the method comprises the following steps:
step 1: in the roll changing process of the hot continuous rolling mill, a lower supporting roll lifting oil cylinder (9) is lifted, so that an electromagnetic valve (1) is electrified to act;
step 2: the electromagnetic valve (1) controls the hydraulic oil cylinder (6) to move forward towards the interior of the lower supporting roller base (7);
and step 3: the hydraulic oil cylinder (6) controls the lower step base plate (8) to move, the automatic flow position positioning is started, the current stroke distance S of the piston rod of the oil cylinder is calculated through the control system, and the calculation formula is as follows:
S=PL×C
wherein, PLC is the pulse resolution of the flow detection sensor (5) and the pulse number of the current stroke;
and 4, step 4: the control system outputs the current detection position quantity of the lower step base plate (8) for the actual position feedback and automatic control of the hydraulic oil cylinder (6).
6. The method for detecting the step down position of a hot continuous rolling mill as set forth in claim 5, wherein: the step 3 comprises the following steps:
step 3.1: when the hydraulic oil cylinder (6) controls the lower step base plate (8) to move to the highest position in the supporting roller base (7), the maximum stroke position of the piston rod of the oil cylinder is calibrated to be X through the flow detection sensor (5)maxAnd recording the maximum stroke pulse number of the piston rod of the oil cylinder as Cmax；
Step 3.2: when the hydraulic oil cylinder (6) controls the lower step base plate (8) to move to the lowest position in the supporting roller base (7), the minimum stroke position of the piston rod of the oil cylinder is calibrated through the flow detection sensor (5)Is XminAnd recording the minimum stroke pulse number of the piston rod of the oil cylinder as Cmin；
Step 3.3: calculating the pulse resolution P of the flow sensor (5)LThe calculation formula is as follows:
PL=（Xmax-Xmin）/（Cmax-Cmin）
wherein, XmaxThe maximum stroke position of the piston rod of the oil cylinder;
Xminthe minimum stroke position of the piston rod of the oil cylinder;
Cmaxthe maximum stroke pulse number of the piston rod of the oil cylinder;
Cminthe minimum stroke pulse number of the piston rod of the oil cylinder;
step 3.4: the control system comprises a PLC (14) and an upper computer (15), the current stroke distance S of the piston rod of the oil cylinder is calculated through the upper computer (15), and the distance signal is fed back to the PLC (14), and the calculation formula is as follows:
S=PL×C
wherein, PLC is the pulse resolution of the flow detection sensor (5) and the pulse number of the current stroke;
step 3.5: the feedback signal enters the PLC (14) through an I/O board card of the PLC (14) for decoding analysis and program processing.
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| CN111744970B (en) | 2022-03-18 |
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