CN111256904B - Online calibration device and method for tensiometer - Google Patents
Online calibration device and method for tensiometer Download PDFInfo
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- CN111256904B CN111256904B CN201811458858.7A CN201811458858A CN111256904B CN 111256904 B CN111256904 B CN 111256904B CN 201811458858 A CN201811458858 A CN 201811458858A CN 111256904 B CN111256904 B CN 111256904B
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- tensiometer
- tension measuring
- force
- measuring roller
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
Abstract
The invention relates to an on-line calibrating device for a tensiometer, which comprises a circumference ruler which is fixed on the excircle of a tension measuring roller in a surrounding way, and a force application and measurement device which is supported between the tension measuring roller and a supporting point. The scheme provides an on-line calibration device of the tensiometer with compact structure, which is convenient to implement on a cold rolling production line; the method for calibrating the tensiometer on line is provided, guides the tensiometer on line calibrating device to use, and solves the technical problem that the tensiometer in the prior art is difficult to calibrate on line.
Description
Technical Field
The invention relates to a calibrating device, in particular to an on-line calibrating device for a tensiometer, and belongs to the technical field of metallurgical measuring equipment.
Background
The tensiometer is used for measuring the tension applied to the strip steel and is arranged between the bearing seat of the tension measuring roll and the mechanical frame, as shown in figure 1. When the strip steel passes through the tension measuring roller at a certain wrap angle, the tensiometer can obtain a tension signal under the tension action of the strip steel. Setting the dead weight F of the tension rollerTThe tension T is applied to the strip steel, and the front wrap angle alpha and the back wrap angle beta pass through the tension measuring roller, so that the tension meter is applied with a vertical force FV＝FT+ Tsin alpha + Tsin beta, the horizontal force FHAnd measuring the tension value by a vertical type or horizontal type tensiometer, and transmitting the measured tension value to an automatic system for closed-loop control of the strip steel tension. In the cold continuous rolling production, if the tension of the strip steel is unreasonable, the strip steel can be deviated, even the strip is broken and stopped, and various quality problems of plate shapes and coil shapes can be caused. Therefore, the tensiometer is calibrated regularly, the tension measurement is ensured to be accurate, and the quality and the yield of the cold-rolled products are guaranteedThe production is smooth and has important significance.
The off-line calibration of the tensiometer has the advantages that the calibration result of the tension sensor is accurate, but the tensiometer is a measurement system consisting of a plurality of mechanical and electrical components comprising the tension sensor, and the installation precision of each component has great influence on the measurement result of the tensiometer, so that the on-line calibration is more meaningful; simultaneously, the disassembly and assembly workload of the lower wire of the tensiometer is large, and the online calibration has the obvious advantages of time saving and labor saving. A tensiometer manufacturer recommends an on-line calibration method for hanging weights: a steel wire rope passes through a tension measuring roller along the path of the strip steel, a weight is hung at one end, a weight is hung at the other end, and the weight of the weight is the tension of the strip steel when the two ends are balanced. This method is rarely implemented due to the compact layout of the cold rolling line, the lack of necessary space for "hanging weights". Some tension sensors of manufacturers have an internal space, and can apply standard force to the internal space for calibration, but the tensiometer of which the tension sensor does not have the internal space has the problem that the origin of the standard force is difficult to find.
Disclosure of Invention
The invention provides an on-line calibration device for a tensiometer, which aims at solving the technical problems in the prior art, is convenient to implement on a cold rolling production line, provides an on-line calibration method for the tensiometer, guides the use of the on-line calibration device for the tensiometer and solves the technical problem of difficult on-line calibration of the tensiometer in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides an online calibrating device of tensiometer which characterized in that, online calibrating device is including surrounding the circumference chi of fixing on surveying the roller excircle to and the application of force and the measuring force device of shore between surveying roller and strong point.
As an improvement of the invention, the circumference ruler comprises a fixing piece, a connecting piece, a graduated scale and a pointer, wherein the fixing piece is fixedly connected with two ends of the circumference ruler graduated scale, and the connecting piece is used for connecting the fixing pieces at two ends of the circumference ruler graduated scale, so that the circumference ruler is fixed on the outer surface of the tension measuring roller; the pointer is fixedly connected to one end of the force application and force measurement device for supporting the tension measuring roller, is positioned on the same plane with the circumference ruler dividing ruler and always points to the axis of the tension measuring roller.
As a refinement of the invention, the force application and measurement device 5 comprises: the symmetrical axes are positioned on the same straight line, and a first positioning sleeve, a force application module, a middle sleeve, a standard dynamometer and a second positioning sleeve are sequentially and movably matched in a small clearance mode, wherein one end of the first positioning sleeve, which is contacted with the tension measuring roller, is of an axisymmetric V-shaped structure, the other end of the first positioning sleeve is provided with a recess matched with the force application module, and the extension line of the symmetrical axes of the force application and measurement device always passes through the axis of the tension measuring roller according to the geometric characteristic that the axisymmetric V-shaped structure is tangent to the circumference; the force application module can expand or contract within a certain range; the two ends of the middle sleeve are provided with recesses which are respectively matched with the force application module and the standard dynamometer; the second positioning sleeve and the first positioning sleeve have the same structure.
As an improvement of the invention, the second positioning sleeve comprises a length adjusting piece and an elongated positioning sleeve which are connected in a threaded or pin mode, when the length adjusting piece and the elongated positioning sleeve are connected at different positions, the total length of the second positioning sleeve is different, so that the total length of the force application and measurement device is convenient to adjust, and the force application and measurement device is supported between the tension measuring roller and the supporting point.
As an improvement of the invention, said force application and measurement device further comprises a combined support, said combined support comprising: the combined support sleeve comprises a combined support sleeve, a first combined part and a second combined part, wherein the first combined part and the second combined part are connected into a combined body with adjustable length in a threaded or pin mode, the middle sleeve, the first positioning sleeve and the second positioning sleeve are respectively provided with a combined support sleeve, the middle of the combined support sleeve is provided with a hole, and the combined body and the hole are in clearance fit and penetrate through the three holes. When the force applying and force measuring device expands and contracts, the combination body can correspondingly slide in the hole, so that the functions of movably connecting the components of the force applying and force measuring device and preventing scattering are achieved.
As an improvement of the present invention, the fixing member is a nut, and the connecting member is a screw.
A method for calibrating an on-line calibration device for a tensiometer, the method comprising the steps of: 1) installing a circumference ruler, and enabling the circumference ruler to be tightly attached to the excircle of the tension measuring roller and to be positioned in the same plane vertical to the axis of the tension measuring roller; the zero scale line of the circumference ruler is connected with the axis of the tension roller in the installation plane, and the horizontal tensiometer is in the horizontal direction; for a vertical type tensiometer, the vertical direction is adopted;
2) establishing a supporting point, and calibrating a horizontal tensiometer, wherein the supporting point is a roller or a fixed object on one side of a tension measuring roller; calibrating a vertical tension meter, selecting a roller or a fixed object on each of two sides of a tension measuring roller, and connecting the rollers or the fixed objects by connecting cables to form a flexible supporting point;
3) and installing a force application and measurement device. The force application and measurement device is supported between the tension measuring roller and the supporting point through the expansion force application module, wherein the V-shaped end of the first positioning sleeve supports the tension measuring roller, and the V-shaped end of the second positioning sleeve supports the supporting point;
4) the standard force direction is determined. And reading the distance l of the standard force deviating from the zero position of the circumference ruler according to the pointer indication, wherein the direction angle theta of the standard force satisfies the following conditions: theta is l/r;
5) the component of the standard force in the measuring direction is determined. Reading out the indication value f of the standard tensiometer, and then, the horizontal standard force borne by the calibrated horizontal tensiometer is f · cos θ; considering the influence of the self weight W of the force application and the force measurement device, the vertical component of the standard force given by the calibration device and received by the calibrated vertical tension meter is (f · cos theta + W · cos theta);
6) a calibration offset is calculated. The calibrated tensiometer reading is compared with the component of the standard force in the measuring direction, resulting in a calibration deviation. Reading a calibrated tensiometer indication value F, wherein the calibration deviation delta of the level type tensiometer is F-F · cos theta; for the vertical type tensiometer, the calibration deviation δ is F- (F · cos θ + W · cos θ).
Compared with the prior art, the invention has the following advantages: 1) the technical scheme combines the force application module and the standard dynamometer to replace a structure of generating standard force by heavy objects and weights with huge volume, and is easy to implement on a cold rolling production line with compact arrangement; 2) the positioning sleeve contacted with the excircle of the tension measuring roller adopts an axisymmetric V-shaped structure, so that a pointer arranged on a symmetric shaft of the V-shaped positioning sleeve always points to the axis of the tension measuring roller, the direction of a standard force is effectively limited, and the horizontal or vertical component of the standard force can be accurately calculated; 3) according to the on-line calibration method of the tension meter, the common rollers on the cold rolling production line are selected as supporting points, or the steel wire rope is selected to be connected with the fixed object to form the flexible supporting points, so that the problem that the force points are difficult to find by standard force is solved.
Drawings
FIG. 1 is a schematic view of a tensiometer measurement principle;
FIG. 2 is a schematic view of a horizontal type tensiometer calibration;
FIG. 3 is a schematic view of a vertical type tensiometer calibration;
in the figure: the device comprises a strip steel 1, a tension meter 2, a tension measuring roller 3, a circumference ruler 4, a nut 41, a screw 42, a graduated scale 43, a pointer 44, a force application and measurement device 5, a first positioning sleeve 51, a force application module 52, an intermediate sleeve 53, a standard dynamometer 54, a second positioning sleeve 55, an extended screw 551, an extended positioning sleeve 552, a combined supporting piece 56, a combined supporting sleeve 561, a first combined piece 562, a second combined piece 563, a nut 564, a supporting point 6, a fixed object 61 and a connecting cable 62.
Detailed Description
For the purposes of promoting an understanding and appreciation of the invention, reference will now be made to the following detailed description of the invention taken in conjunction with the accompanying drawings.
Example 1: referring to fig. 1 and 2, an on-line calibration device for a tensiometer is used for on-line calibrating a cold rolling production line tensiometer with 0.5-level accuracy, as shown in fig. 2, and comprises: a circumference ruler 4 and a force application and measurement device 5.
Wherein the circumference ruler 4 comprises a nut 41, a screw 42, a graduated scale 43 and a pointer 44, and the manufacturing method comprises the following steps: and cutting a section of the steel measuring tape with the length slightly smaller than the perimeter of the tension measuring roller, and marking the length scale mark to be used as a 43-scale ruler. And marking a zero graduation line at a proper position deviated from the middle part of the steel measuring tape, and marking the length graduation line of the circumference ruler from the zero graduation line to two sides. Two identical nuts 41 are welded to the ends of the length of steel tape, and suitable screws 42 are optionally used to connect the two nuts, so that the circumference gauge can be wound around the surface of the tension measuring roller at any angle and in a plane perpendicular to the axis of the tension measuring roller. The pointer 44 is fixedly mounted on the V-shaped symmetrical axis of the first positioning sleeve 51 near the tension roller.
The force application and measurement device 5 comprises: the manufacturing method comprises the following steps of: one end of the first positioning sleeve 51 and one end of the second positioning sleeve 55 are V-shaped with opening angles of 120 degrees and symmetrical in the middle, the other end of the first positioning sleeve is a cylindrical hole, and the force application module 52 is an oil jack; the two sides of the middle sleeve 53 are cylindrical holes; the standard load cell 54 is a resistive strain gauge pressure sensor with an accuracy rating of 0.1. Two ends of the hydraulic jack are respectively in small clearance fit with the cylindrical hole of the first positioning sleeve 51 and the cylindrical hole on one side of the middle sleeve 53, and the depth of the hole at the telescopic head of the hydraulic jack is smaller than the length of the telescopic head; two ends of the pressure sensor are respectively in small clearance fit with the other cylindrical hole of the middle sleeve 53 and the cylindrical hole on the second positioning sleeve 55, and the hole depth at the pressure head of the pressure sensor is smaller than the length of the pressure head; the second positioning sleeve 55 includes: the extension screw 551 and the extension positioning sleeve 552, one end of the extension screw 551 is a cylindrical hole, the other end is an external thread, and is matched with one end with an internal thread of the extension positioning sleeve 552, and the end without the thread of the extension positioning sleeve 552 is a V-shaped structure with a symmetrical opening angle of 120 degrees. The combined supporter 56 includes: a combined support sleeve 561, a first assembly 562, a second assembly 563, and a nut 564. The first positioning sleeve 51, the middle sleeve 53 and the second positioning sleeve 55 are respectively provided with a combined supporting sleeve 561 with a cylindrical hole, two cylindrical first combined members 562 and a cylindrical 563 second combined member form a length-adjustable combined body in a threaded connection mode and penetrate through the cylindrical holes of the three 561 combined supporting sleeves, one end, which is not connected with the second combined member 563, of each cylindrical first combined member 562 is provided with an external thread, and a nut 564 is connected with the external threads to prevent the combined body from falling off from the combined supporting sleeve 561.
Because the tensiometer is fixedly arranged between the tension measuring roller and the fixed frame, when a standard force with known direction and magnitude is applied to the tension measuring roller, the tensiometer is also acted by the standard force. And comparing the reading of the tensiometer with the component of the standard force in the calibration direction to obtain the calibration deviation of the tensiometer.
Example 2, horizontal type tensiometer on-line calibration method. As shown in fig. 2, the method specifically includes the following steps: 1) fixing the circumference ruler on a plane perpendicular to the axial line of the tension measuring roller on the outer surface of the tension measuring roller, and enabling the connecting line of the zero scale of the circumference ruler and the axial center on the plane to be in the horizontal direction; 2) and 6, selecting a roller beside the tension measuring roller as a supporting point. The force application and measurement device is supported between the tension measuring roller and the supporting point, wherein the V-shaped end of the first positioning sleeve supports the tension measuring roller, and the V-shaped end of the second positioning sleeve supports the supporting point; 3) reading the distance l of the standard force deviating from the zero position of the circumference ruler according to the position of the pointer on the first positioning sleeve, wherein the direction angle theta of the standard force satisfies the following conditions: theta is l/r; 4) reading out the indicated value f of the standard tensiometer, wherein the horizontal standard force borne by the calibrated tensiometer is f · cos theta; 5) when the calibrated tension gauge is read, the gauge error δ is F-F · cos θ. 6) And (5) respectively applying standard forces with different magnitudes, and repeating the steps 4) and 5) to finish the calibration of each measuring point.
Example 3, vertical type tensiometer on-line calibration method. As shown in fig. 3, the method specifically includes the following steps: 1) fixing a circumference ruler on a certain plane vertical to the axial line of the tension measuring roller on the excircle of the tension measuring roller, and enabling the connecting line of the zero scale of the circumference ruler and the axis on the plane to be positioned in the vertical direction; 2) weighing to obtain the weight W of the force application and measurement device; 3) selecting proper 61 fixed objects at two sides of the 3-measuring roller, and surrounding the two fixed objects by using a steel wire rope to obtain flexible 6 supporting points; 4) the force application and measurement device is supported between the tension measuring roller and the flexible supporting point, wherein the V-shaped end of the first positioning sleeve supports 3 the tension measuring roller, and the V-shaped end of the second positioning sleeve supports 6 the flexible supporting point; 5) reading the distance l deviating from the zero position of the circumference ruler according to the position of the pointer on the first positioning sleeve 51, wherein the direction angle theta of the standard force satisfies the following conditions: theta is l/r; 6) reading the indication value of the standard tensiometer to be f, and then, the vertical standard force borne by the calibrated tensiometer to be f · cos theta; 7) calculating the additional tare weight generated by the self weight of the force application and force measurement device as W.cos theta; 8) if the calibrated tensiometer reading is F, the indication error delta is F- (F · cos theta + W · cos theta). 9) And (5) applying standard forces with different magnitudes by the force application module, and repeating the steps 6) and 8) to finish the calibration of each measuring point.
The tensiometer on-line calibration device of the scheme adopts a compact structure and is suitable for being arranged on a compact cold rolling production line. The on-line calibration method of the tensiometer guides the on-line calibration device of the tensiometer to be used on site, and solves the problem that a standard force acting point is difficult to find by skillfully selecting a supporting point. Finally, the technical problem that the tensiometer is difficult to calibrate on line is successfully solved by the scheme.
It should be noted that the above-mentioned embodiments do not limit the scope of the present invention, and equivalents and substitutions made on the basis of the above-mentioned embodiments are included in the scope of the present invention.
Claims (5)
1. An on-line calibration device of a tensiometer is characterized by comprising a circumference ruler fixed on the excircle of a tension measuring roller in a surrounding way, and a force application and measurement device supported between the tension measuring roller and a supporting point;
the circumference ruler comprises a fixing piece, a connecting piece, a graduated scale and a pointer, wherein the fixing piece is fixedly connected to two ends of the circumference ruler graduated scale, and the connecting piece is used for connecting the fixing piece at two ends of the circumference ruler graduated scale, so that the circumference ruler is fixed on the outer surface of the tension measuring roller; the pointer is fixedly connected to one end of the force application and force measurement device for supporting the tension measuring roller, is positioned on the same plane with the circumference ruler dividing ruler and always points to the axis of the tension measuring roller;
the force application and measurement device comprises: the tension measuring device comprises a first positioning sleeve, a force application module, an intermediate sleeve, a standard dynamometer and a second positioning sleeve, wherein one end of the first positioning sleeve, which is contacted with a tension measuring roller, is of an axisymmetric V-shaped structure, and the other end of the first positioning sleeve is provided with a recess matched with the force application module; the force application module expands or shortens within a certain range; the middle sleeve is provided with a recess at two ends and is respectively matched with the force application module and the standard dynamometer.
2. The tensiometer on-line calibration device of claim 1, wherein the second locating sleeve comprises a length adjustment member and an elongated locating sleeve connected in a threaded or pinned manner.
3. The tensiometer on-line calibration device of claim 2 wherein the force application and measurement device further comprises a combination support comprising: the combined support sleeve comprises a combined support sleeve, a first combined part and a second combined part, wherein the first combined part and the second combined part are connected into a combined body with adjustable length in a threaded or pin mode, the middle sleeve, the first positioning sleeve and the second positioning sleeve are respectively provided with a combined support sleeve, the middle of the combined support sleeve is provided with a hole, and the combined body and the hole are in clearance fit and penetrate through the three holes.
4. The tensiometer on-line calibration device of claim 1, wherein the fixing member is a nut and the connecting member is a screw.
5. Method for calibrating an on-line calibration device for a tensiometer according to any of claims 1 to 4, characterised in that it comprises the following steps: 1) installing a circumference ruler, and enabling the circumference ruler to be tightly attached to the excircle of the tension measuring roller and to be positioned in the same plane vertical to the axis of the tension measuring roller; the zero scale line of the circumference ruler is connected with the axis of the tension roller in the installation plane, and the horizontal tensiometer is in the horizontal direction; for a vertical type tensiometer, the vertical direction is adopted;
2) establishing a supporting point, and calibrating a horizontal tensiometer, wherein the supporting point is a roller or a fixed object on one side of a tension measuring roller; calibrating a vertical tension meter, selecting a roller or a fixed object on each of two sides of a tension measuring roller, and connecting the rollers or the fixed objects by connecting cables to form a flexible supporting point;
3) installing a force application and measurement device, and propping the force application and measurement device between the tension measuring roller and the supporting point through an expansion force application module, wherein the V-shaped end of the first positioning sleeve props against the tension measuring roller, and the V-shaped end of the second positioning sleeve props against the supporting point;
4) determining the direction of the standard force, reading the distance l of the standard force deviating from the zero position of the circumference ruler according to the indication of the pointer, and ensuring that the direction angle theta of the standard force meets the following conditions: theta is l/r;
5) determining the component of the standard force in the measuring direction, reading the indication value of the standard tensiometer as f, and then, the horizontal standard force borne by the calibrated horizontal tensiometer is f · cos θ; considering the influence of the self weight W of the force application and the force measurement device, the vertical component of the standard force given by the calibration device and received by the calibrated vertical tension meter is (f · cos theta + W · cos theta);
6) calculating a calibration deviation, comparing the reading of the calibrated tensiometer with the component of the standard force in the measuring direction to obtain the calibration deviation, reading out the indication value F of the calibrated tensiometer, and regarding the horizontal tensiometer, the calibration deviation delta is F-F · cos theta; for the vertical type tensiometer, the calibration deviation δ is F- (F · cos θ + W · cos θ).
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| CN114323239A (en) * | 2020-09-29 | 2022-04-12 | 上海梅山钢铁股份有限公司 | Molten steel scale calibration device and application method thereof |
| CN113340523B (en) * | 2021-04-16 | 2022-11-01 | 河南省计量科学研究院 | Touch pressure type belt tension meter calibrating device |
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