CN116727623A - Online calibration method for sector displacement sensor of continuous casting machine - Google Patents
Online calibration method for sector displacement sensor of continuous casting machine Download PDFInfo
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- CN116727623A CN116727623A CN202310651822.5A CN202310651822A CN116727623A CN 116727623 A CN116727623 A CN 116727623A CN 202310651822 A CN202310651822 A CN 202310651822A CN 116727623 A CN116727623 A CN 116727623A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000009749 continuous casting Methods 0.000 title claims abstract description 24
- 238000003825 pressing Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 240000004282 Grewia occidentalis Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention discloses a method for calibrating a sector displacement sensor of a continuous casting machine on line, wherein a displacement sensor is arranged in a hydraulic cylinder at the inlet side of the sector of a plate-broken continuous casting control device; a displacement sensor is arranged in a hydraulic cylinder at the inlet side of the sector section at a hinge point of an upper frame and a lower frame and at the outlet side of the sector section; when the calibration is carried out, a special calibration chain for the roller gap of the fan-shaped section is adopted to be conveyed into the fan-shaped section to be calibrated, the calibration chain is clamped at two ends of two rollers at the inlet and outlet of an upper frame roller of the fan-shaped section and a lower frame roller of the fan-shaped section, the roller edge is 110-120mm apart, the pressure of a hydraulic cylinder is determined to be 130MPa, the upper frame is pressed down, the rollers are completely pressed down and compacted on the calibration chain, the clearance values at the two ends of the inlet of the fan-shaped section and the clearance values at the two sides of the upper roller and the lower roller of the outlet are respectively measured by a roller gap measuring instrument, and the value of the zero point of the displacement sensor is obtained by 'assigning' the relative position of the displacement sensor through an operation panel.
Description
Technical Field
The invention relates to a method for calibrating a sector displacement sensor of a continuous casting machine on line.
Background
The sector section of the continuous casting machine mainly plays a role in supporting and guiding the blank shell with the liquid core through clamping of an upper roller and a lower roller, so that the blank shell advances along a given track and is limited to be subjected to bulging deformation; the cooling solidification is accelerated by means of the atomization injection of steam and water in the secondary cooling area; in addition, along with the rotation driving of a specific roller, the device plays a role in guiding and supporting a dummy bar, has a role in traction and straightening a casting blank, is one of devices for ensuring smooth production of continuous casting, and is also a key for controlling the quality of the casting blank. The variable hydraulic control roll gap of the sector section of the slab caster must be controlled within a specified range, and the exceeding range can seriously affect the smooth production and quality of the continuous casting billet.
The sector section of the slab caster at present adopts an off-line calibration mode, and the calibration method is as follows: the upper frame is clamped on a distance block corresponding to a 200mm roll gap by 4 clamping hydraulic cylinders at system pressure, and then 4 corners between the upper frame and the lower frame are jacked by hydraulic jacks at the same time, so that the hinge point gap is eliminated, and the zero position of a position sensor is calibrated.
The calibration method has the defect that when a larger gap exists at one or two hinge points, after a jack is lifted for a certain distance at the position, the upper frame of the sector section can overturn around the hinge point, and the jacks can mutually angle force, so that the gap at the hinge point cannot be completely eliminated, and the roll gap cannot be accurately controlled in the production process; in addition, because the calibration block belongs to a welded frame structure, deformation can occur in the depressing process of the sector section oil cylinder, the measurement precision value is affected, and certain error is generated in calibration.
The adjustment of the real-time tracking roll gap of the built-in displacement sensor of the hydraulic cylinder of the soft-reduction sector of the plate continuous casting has high control precision, but the zero position of the displacement sensor is required to be calibrated in the application process, and the traditional calibration method of the distance block or the four-corner full contact type is large in calibration deviation due to the structural characteristics of the soft-reduction sector, so that the numerical deviation between the tracking roll gap and the actual measured roll gap is large in actual production, often exceeds more than 3mm, and the casting blank quality problem is easy to occur.
The invention is characterized in that before the roll gap measurement of a casting machine, the roll gap opening degree of all fan-shaped sections of a casting machine flow line which can be used for on-line adjustment of the roll gap opening degree is set and fixed at a fixed value H- (parallel), the value of H- (parallel) is 5-15mm greater than the thickness of a slab of the casting machine, each roll gap opening degree of the fan-shaped sections of the flow line is measured according to the setting, a measuring point outside the maximum section produced by the casting machine is selected as calibration use data, the calibration adjustment quantity of the flow line roll gap opening degree is determined, and the calibration adjustment is carried out according to the determined calibration adjustment quantity of the roll gap opening degree.
Disclosure of Invention
The invention aims to provide a method for calibrating a sector displacement sensor of a continuous casting machine on line, which is used for implementing a zero position accurate measurement method for a built-in displacement sensor of a hydraulic cylinder of a sector under soft reduction, namely a method for compacting and calibrating a calibration chain mark and completely eliminating the gap between a roller and a frame twisted point so as to improve the quality of casting blanks.
The technical scheme adopted by the invention is that in the method for calibrating the displacement sensor of the fan-shaped section of the continuous casting machine on line, the displacement sensor is arranged in the hydraulic cylinder at the inlet side of the fan-shaped section of the plate-broken continuous casting control device; hinge points of upper and lower frames at the inlet side of the sector section; a displacement sensor is arranged in the hydraulic cylinder at the outlet side of the fan-shaped section; hinge points at the upper parts of the upper and lower frames at the outlet side of the fan-shaped section; the method comprises the steps of conveying a special calibration chain for the roll gap of a sector section into the sector section to be calibrated, clamping the calibration chain at two ends of two rollers at an inlet and outlet of an upper frame roller of the sector section and a lower frame roller of the sector section, separating the roller edges by 110-120mm, determining the pressure of a hydraulic cylinder of the calibration chain to be 130MPa, pressing down the upper frame, completely pressing down the rollers on the calibration chain, generating acting force and reacting force, eliminating a hinge point gap, a roller bearing gap and a hinge point distortion gap, measuring clearance values of two sides of the upper roller and the lower roller of the sector section by a roll gap measuring instrument, and assigning the clearance values of the two sides of the upper roller and the lower roller of the sector section to be four values respectively, wherein the relative positions of the four values to the displacement sensor through an operation panel are the zero point reference value of the displacement sensor.
After the zero position of the displacement sensor is determined by the method, the deviation precision of the actual roll gap value of the sector section and the roll gap value displayed by the sensor is less than or equal to 0.3mm, the control requirement of the roll gap precision of the sector section under light pressure is completely met, and the casting blank quality is improved.
The method is characterized in that aiming at the fact that a single hinge point outlet of a hydraulic control variable roll gap fan-shaped section inlet and outlet structure is a double hinge point structure, the relative displacement phenomenon exists between an upper frame and a lower frame in the calibration process, errors are brought to accurate calibration of the sensor, and meanwhile, the phenomenon that the calibration block is easy to deform to cause unstable measurement data is eliminated. Meanwhile, because the calibration chain is longer, four fan-shaped sections can be calibrated at a time, the calibration speed is improved by four times, the calibration speed of the whole continuous casting machine is greatly shortened, the efficiency is greatly improved, the equipment maintenance time is shortened, and the operation rate of the casting machine is improved.
The technical scheme adopted by the invention is that the method for precisely calibrating the zero reference of the displacement sensor is characterized in that the pressing pressure of a hydraulic cylinder of a sector section is adjusted to be 13+/-0.5 MPa, so that a calibration chain special for pressing and compacting an upper frame is clamped on two rollers at an inlet and an outlet, the calibration chain is completely compacted, a pair of acting force and reacting force are generated between the upper frame and the lower frame, and a hinge point gap, a roller bearing gap and a hinge point distortion gap can be eliminated, at the moment, the clearance values of the upper roller and the lower roller on the two sides of an inlet of the sector section and the two sides of an outlet of the sector section are respectively measured by a roller gap measuring instrument, 4 values are shared, and the zero position of the displacement sensor is assigned to the current relative position of the displacement sensor through an operation panel, namely, the zero position of the displacement sensor is determined, so that the actual roller gap value and the displacement sensor display position deviation precision is less than or equal to 0.3mm, the change of the roller gap is precisely controlled, the control requirement of the roller gap precision of the sector section is completely met, and the casting blank quality is improved.
The on-line calibration of the displacement sensor of the soft-reduction sector section of the slab continuous casting machine adopts the special calibration chain for calibration, the calibration chain is formed by linking a plurality of links, the length of the calibration chain is 12.58 meters, and the thickness of the calibration chain is 0.217 meter, and the calibration chain can be flexible and can be bent and deformed at will, so that the horizontal section and the arc section can be calibrated. Before calibration, the calibration chain is firstly centered and then conveyed into the outlet position of the continuous casting machine through a roller way to be poured into the sector section like a dummy ingot, the calibration chain is conveyed to the position of the sector section to be calibrated by virtue of the driving roller of the sector section, 4 sections can be calibrated at one time because the length of the calibration chain is longer, the pressure of the pressure system of the sector section of the host machine is adjusted to 12MPa from 18MPa after the calibration chain is conveyed in place, and the pressure is reduced because the hydraulic cylinders positioned at four corners of the sector section can be ensured to completely press the sector section in place and the calibration chain is not broken. The distance between the calibration chain and the edge of the roller is 110-120mm, all the rollers of the upper frame of the sector section are determined to be completely compacted on the calibration chain, so that the upper frame is pressed down to generate acting force and reaction force, and the gap of a hinge point is eliminated; the roller bearing gap and the hinge point distortion gap are measured respectively by a roller gap measuring instrument, the total of 4 values are measured respectively by the upper roller gap value and the lower roller gap value of the inlet and the outlet of the fan-shaped section, and the total of 4 values are written into the zero position of the lifting cylinder corresponding to the roller gap control panel of the fan-shaped section respectively, and the value of the current relative position of the displacement sensor on the operation panel is the zero position reference value of the built-in displacement sensor of the lifting cylinder. By the method, error correction can be carried out on the roll gap of the sector segment, so that the deviation between the actual roll gap value of the sector segment and the displacement of the displacement sensor is smaller than 0.3mm, the control requirement on roll gap precision of the sector segment under light reduction is completely met, and the casting blank quality is improved.
Compared with the prior art, the invention adopts the special calibration chain for the roller gap of the fan-shaped section to be conveyed into the fan-shaped section to be calibrated, the calibration chain is clamped at the two ends of the two rollers at the inlet and outlet of the upper frame roller of the fan-shaped section and the lower frame roller of the fan-shaped section, the roller edge is 110-120mm apart, the pressure of the hydraulic cylinder is determined to be 130MPa, the upper frame is pressed down, the rollers are completely pressed down and compacted on the calibration chain, the acting force and the reaction force are generated to eliminate the gap of the hinge point, the gap of the roller bearing and the gap of the hinge point distortion, the gap measuring instrument is used for measuring the clearance values at the two ends of the inlet of the fan-shaped section and the clearance values at the two sides of the upper roller and the lower roller of the outlet respectively, and the 4 values are assigned to the relative position of the displacement sensor through the operation panel, namely the zero point reference value of the displacement sensor. After the zero position of the displacement sensor is determined by the method, the deviation precision of the actual roll gap value of the sector section and the roll gap value displayed by the sensor is less than or equal to 0.3mm, the control requirement of the roll gap precision of the sector section under light pressure is completely met, and the casting blank quality is improved.
The invention has the advantages that: starting from the structure of the soft-reduction sector section, the method can be used for calibrating the displacement sensor, so that an accurate zero position can be provided for the displacement sensor, the roll gap can be remotely and accurately adjusted according to production requirements in actual production, and reliable technical guarantee is provided for improving the quality of casting blanks.
The method is suitable for the same type of iron and steel enterprises, the accuracy of calibrating the roll gap value of the soft-reduction sector section of the slab continuous casting machine is higher, the roll gap of all roll rows of the continuous casting machine can be measured, and whether the roll gap of the sector section of the continuous casting machine is normal or not can be accurately judged and tracked. The actual tracking of the roll gap of the continuous casting sector section does not need manual measurement, so that the pressure relief of a hydraulic oil cylinder is avoided, the safety of constructors faces extremely dangerous conditions, the risk that the constructors are damaged by extrusion between the clamping rollers is thoroughly eliminated, and the safety of the constructors can be ensured. Meanwhile, the four sector sections can be calibrated at one time, the calibration speed is improved by four times, the calibration speed of the whole continuous casting machine is greatly shortened, the efficiency is greatly improved, the equipment maintenance time is shortened, and the operation rate of the casting machine is improved.
Description of the embodiments
A method for calibrating displacement sensor of sector section of continuous casting machine on line, there is displacement sensor in the hydraulic cylinder of inlet side of sector section of its control device of plate-broken continuous casting; hinge points of upper and lower frames at the inlet side of the sector section; a displacement sensor is arranged in the hydraulic cylinder at the outlet side of the fan-shaped section; hinge points at the upper parts of the upper and lower frames at the outlet side of the fan-shaped section; the method comprises the steps of conveying a special calibration chain for the roll gap of a sector section into the sector section to be calibrated, clamping the calibration chain at two ends of two rollers at an inlet and outlet of an upper frame roller of the sector section and a lower frame roller of the sector section, separating the roller edges by 110-120mm, determining the pressure of a hydraulic cylinder of the calibration chain to be 130MPa, pressing down the upper frame, completely pressing down the rollers on the calibration chain, generating acting force and reacting force, eliminating a hinge point gap, a roller bearing gap and a hinge point distortion gap, measuring clearance values of two sides of the upper roller and the lower roller of the sector section by a roll gap measuring instrument, and assigning the clearance values of the two sides of the upper roller and the lower roller of the sector section to be four values respectively, wherein the relative positions of the four values to the displacement sensor through an operation panel are the zero point reference value of the displacement sensor.
Claims (1)
1. A method for calibrating a sector displacement sensor of a continuous casting machine on line is characterized in that a displacement sensor is arranged in a hydraulic cylinder at the inlet side of a sector of a plate-broken continuous casting control device; hinge points of upper and lower frames at the inlet side of the sector section; a displacement sensor is arranged in the hydraulic cylinder at the outlet side of the fan-shaped section; hinge points at the upper parts of the upper and lower frames at the outlet side of the fan-shaped section; the method comprises the steps of conveying a special calibration chain for the roll gap of a sector section into the sector section to be calibrated, clamping the calibration chain at two ends of two rollers at an inlet and outlet of an upper frame roller of the sector section and a lower frame roller of the sector section, separating the roller edges by 110-120mm, determining the pressure of a hydraulic cylinder of the calibration chain to be 130MPa, pressing down the upper frame, completely pressing down the rollers on the calibration chain, generating acting force and reacting force, eliminating a hinge point gap, a roller bearing gap and a hinge point distortion gap, measuring clearance values of two sides of the upper roller and the lower roller of the sector section by a roll gap measuring instrument, and assigning the clearance values of the two sides of the upper roller and the lower roller of the sector section to be four values respectively, wherein the relative positions of the four values to the displacement sensor through an operation panel are the zero point reference value of the displacement sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310651822.5A CN116727623A (en) | 2023-06-05 | 2023-06-05 | Online calibration method for sector displacement sensor of continuous casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310651822.5A CN116727623A (en) | 2023-06-05 | 2023-06-05 | Online calibration method for sector displacement sensor of continuous casting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116727623A true CN116727623A (en) | 2023-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310651822.5A Pending CN116727623A (en) | 2023-06-05 | 2023-06-05 | Online calibration method for sector displacement sensor of continuous casting machine |
Country Status (1)
| Country | Link |
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| CN (1) | CN116727623A (en) |
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2023
- 2023-06-05 CN CN202310651822.5A patent/CN116727623A/en active Pending
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