Method for detecting errors of surface planeness of band, particularly steel and metallic band, roller for measuring surface planeness

FIELD: metal working processes and equipment.

SUBSTANCE: roller includes at least one measuring head provided with partial measuring heads mounted at angular shift by 180° one relative to other in envelope of roller. Said partial measuring heads rest upon two force metering pickups; they are spaced in addition from roller envelope by means of gap surrounding them and they fastened one with other at least through one connecting tie rod. In process of measuring tension stress distribution of band along its width, band subjected to tension stresses along its whole width embraces roller for measuring surface planeness by predetermined contact arc. It provides pressure efforts acting upon roller for measuring surface planeness and allows determine tension stress distribution of band according to difference of pressure efforts of partial measuring heads.

EFFECT: improved accuracy of measurements due to elimination of errors caused by influence of outer factors.

12 cl, 5 dwg

 

The invention relates to a method of determining error plantamnesty surface of the tape, in particular, steel and metallic tapes, with the passage of the specified tape, for example, through the processing line tape or line rolling mill, and to the roller for measuring plantamnesty surface.

To perform such a method is known for example from EP 1369186 A2, roller for measuring plantamnesty surface containing at least one integrated beam sensor, which runs in the longitudinal direction on wavy or straight line along the length of the roller to determine stretching forces acting on the specified roller from the tape, with the tape partially around the roller sensor, while determining the tensile strength of beam sensor of your starting area and its end zone is, at least sometimes within the arc of contact, which is formed by a tape, and based on their the ends of the torque on the elements and/or force sensors.

Beam sensor attached to the roller housing with two pre-loading of the bolts that go through the inner bore of the force sensors and apply the specified force pre-load to the force transducers. Such measures are also known when implementing radially intense and annular covers the La force sensors (see also DE 4236657 C2).

Force sensors are piezoelectric crystals that require a bias voltage for measurement of the pressure. However, penetrating the piezoelectric quartz bolts preload necessarily form power shunts, so not all of the measured force entered into force sensor, and part of them is inserted in the bolt preload. Power shunt can be up to 30%. Although the influence of the power shunt can be filtered using an initial calibration, provided however that the power shunt remains constant. However, there is the risk that the value of the power shunt is changed during operation, e.g. due to temperature changes, and thereby leads to a distortion of measurement results. Additionally, the measurement signals do not correspond to full strength to be measured. Can be used as force sensors strain sensors that do not require a bias voltage, which is formed of the power shunt. However, such strain gauges are compared with piezoelectric quartz is relatively small, the accuracy of the measurement.

The basis of the invention is the technical problem of creating a method and a roller for measuring plantamnesty surface to determine errors of plantamnesty surface of the tape, in particular, steel and metal l is, for example, in accordance with which it is possible to use piezoelectric crystals as pressure sensors without unwanted force shunt.

For solving the problem of the invention features a method of identifying errors plantamnesty surface of the tape, in particular, steel and metal bands during the measurement of the distribution of tensile stresses across the width of the tape, while the tape is subjected to tensile stresses across its width, around the roller for measuring plantamnesty surface with a given arc of contact and creates local pressure force corresponding to the local distribution of the longitudinal stretching forces in the direction of the width of the tape, acting on the roller for measuring plantamnesty surface, and the local pressure forces can determine the distribution of tensile stresses in the ribbon, with the roller for measuring plantamnesty the surface contains at least one measuring head, with two partial measuring sensor, with partial measuring sensors integrated with the shift of 180° relative to each other in the shell movie and rely on two force sensor and optionally separated from the shell of the roller with circumferential movement gap and bonded to each other through at least one connecting rod, with valisineria of force sensors each partial measuring head summarize and then the magnitude of the sum of the two partial measuring heads are subtracted from each other, and thus formed a differential value corresponds to the full local power pressure minus the weight of the measuring head and/or its partial measuring heads. These features of the invention provide completely free from the power shunt measurement of the local forces of compression. In fact, the method according to the invention, is characterized by high measurement accuracy with regard to the optimum dynamic characteristics with adequate stiffness of the force sensor. The centrifugal force of the two partial measuring heads, which can reach values of the order of the measured forces at high speeds of rotation of the roller, cancel each other out due to the fact that the two partial measuring head is installed with an offset of 180° relative to each other. In addition, there is the possibility of determining the weight of the measuring head during calibration depending on the angle of rotation of the roller without the forces of pressure and the use of the same weight as the correction function in the analysis of the measured values. The weight component is a sine function, dependent on simultaneously measured angle of rotation of the roller. Using only the calibration to determine a correction function depending on the angle of rotation, so that you can neutralize the influence of the weight measurement. Thus, the measured force at a given angle of rotation can be fully determined by measuring signals of the force sensors. In fact, in the case of a tape measure correctly the measured signal corresponds to a fully local power pressure.

In addition, the subject invention is the roller for measuring plantamnesty surface to perform the method according to the invention, and, therefore, to determine the errors of plantamnesty surface of the tape, in particular, steel and metal bands during the passage of the specified tape, for example, through the processing line tape or line rolling mill, containing at least one measuring head, with two partial measuring head, which is integrated with the shift of 180° relative to each other in the shell movie and rely on two force sensor and optionally separated from the roller jacket with the district of movement gap and bonded to each other via at least one connecting rod, during the measurement of the distribution of tensile stresses in the tape width of the tape, which is subjected to tensile strength along its entire width, the tape wraps around the roller for measuring plantamnesty surface with a given arc of contact, and thereby creates forces in the local pressure corresponding to the local longitudinal distribution of tensile stresses in the direction of the width of the tape, acting on the roller for measuring tablet the ti surface, moreover, local pressure forces can determine the distribution of the tensile stresses of the tape. For correct and complete detection of the measured pressure first calculate the sum of the measuring signals of the force sensors on partial measuring heads in the area of the girth belt. Of them subtract the sum of the measuring signals of the force sensors on the opposite partial measuring head and the weight of the measuring head, and, therefore, the two partial measuring heads. Partial measuring head may have a teardrop shape and respectively to rely in the center of the force sensor. However, according to a preferred variant implementation of the invention, provided that the partial measuring head is made in the form of beam sensors and rely in the end zones of the beam on the force sensors. Force sensors made in the form of a piezoelectric quartz. Beam sensors can be located at right angles or obliquely relative to the axis of the roller. Inclined arrangement produces a wavelike movement of beam sensor. In the surrounding partial measuring the head gap can be entered permanently elastic adhesive and/or sealing, or in the case of circular perform the measuring head - ring. The measuring head preferably contain the two or more partial measurement heads thereby increasing the number of measurements per revolution of the roller. Metal foil connected with adhesive to the upper surface of the roller for exclusion tangential stresses in the zone of compression of tape, preferably covers the measuring head and/or its partial measuring head. The same applies to the case when the roller for measuring plantamnesty surface, according to the invention, includes a casing, made of rubber, synthetic material or carbide. Finally, provided that two or more transmitters located in each zone of the width of the tape, thereby also increasing the number of measurements per revolution of the roller.

Below is a detailed description of the invention on the example of execution with reference to the drawings, which depict:

figure 1 - the roller for measuring plantamnesty surface containing beam sensors as partial measuring heads, in the top view;

figure 2 is a section along the line A-a in figure 1, containing the lower half of the image contained in the plane of the section;

figure 3 is a modified embodiment of the roller according to Fig 1, containing all partial measuring head;

4 is a radial section of the roller according to Fig 3, in a partial area of the measuring heads; and

5 is a chart of effort roller, according to the SNO 2.

Figure 1-4 shows the roller 1 for measuring plantamnesty surface to determine the error plantamnesty surface of the tape 2, in particular, steel tape and metal bands, with the passage of the specified tape 2 through the processing line tape or line rolling mill. This video is for measuring plantamnesty surface contains at least one measuring head 3 with two partial measuring heads which are integrated with the shift of 180° relative to each other in the shell movie and rely on two force sensor and optionally separated from the shell 5 of the roller with circumferential clearance (6) motion and bonded to each other using at least one of the coupling rod 7, during the measurement of the distribution of tensile stresses in the tape width of the tape 2, tape 2, subjected to tensile strength along its entire width, around the roller 1 for measuring plantamnesty surface with a given arc of contact, and thereby creates a local pressure force corresponding to the local distribution of longitudinal tensile stresses in the direction of the width of the tape, acting on the roller 1 for measuring plantamnesty surface, and the local pressure forces can determine the distribution of the tensile stresses of the tape. In the case of options for performing, according to figures 1 and 2, a partial measure concentration of the nutrient heads 3A, 3b is made in the form of beam sensors and rely in the end zones of the beam on the sensors 4 forces. In the case of the variant of execution according to Fig 3 and 4, partial measuring heads 3A, 3b have a circular shape and, accordingly, rely on the Central sensors 4 forces. Sensors 4 power made in the form of a piezoelectric quartz.

In the case of the variant execution of beam sensors, these sensors are tilted relative to the axis of the roller 8 and, therefore, perform wave-like movement. In each zone the width of the tape preferably has two or more measuring heads 3. For locating the measuring heads 3 and/or their partial measuring heads, roller housing contains openings 9, which are partial measuring heads 3A, 3b on the same level with the upper surface of the roller and form a very narrow gap 6 motion with partial covering of the measuring head 3A, 3b neck.

The forces acting on the measuring head and/or its partial measuring heads 3A, 3b in the Z-direction, shown in figure 5. At this fair the following relations:

FG,I=FG,II

FFlieh,I=FFlieh,II

F=0→FMess=FIL+FIR+FIIL+FIIR-2FG,I

For force transducers fair the following relations:

FS,IL=FIL; FS IR=FIR/sub> ;

→FMess=ΣFSI+ΣFSII-2FG,I

1. A method of identifying errors plantamnesty surface of the tape, in particular steel and metal bands during the measurement of the distribution of tensile stresses across the width of the tape in which the tape is subjected to tensile stresses across its width, covered roller for measuring plantamnesty surface with a given arc of contact and creates local pressure force corresponding to the local distribution of longitudinal forces in the tensile zone of the width of the tape, acting on the roller for measuring plantamnesty surface, with local pressure forces determine the distribution of tensile stresses in the tape and the roller for measuring plantamnesty contains at least one measuring head, having two partial measuring head integrated with the shift of 180° relative to each other in the shell movie, bound to each other via at least one connecting rod, which rely on two force sensor and separated from the roller jacket surrounding the gap, and measures of force sensors each partial measuring head summarize, then the sum of these quantities with the same partial measuring head is subtracted from the sum of the values of the other partial measuring head and receive differential value, the corresponding full local forces pressure minus the weight of the measuring head.

2. The method according to claim 1, characterized in that the weight of the measuring head is determined at calibration depending on the angle of rotation of the roller without the forces of pressure and use the weight as a correction function in the analysis of the measured values.

3. Roller (1) for measuring plantamnesty surface ribbon method according to any one of claim 1 or 2, containing at least one measuring head (3)having two partial measuring head integrated with the shift of 180° relative to each other in the shell (5) of the roller, which rely on two force sensor, separated from the shell (5) roller surrounding the gap (6) and are connected to each other via at least one connecting rod (7)with the roller (1) is made with the possibility of embracing his tape with a given arc of contact, during measurement of the distribution of tensile stresses along its width, and thereby create local forces pressure corresponding to the local longitudinal distribution of tensile stresses in the direction of the width of the tape, acting on the roller, with the ability to determine from the local forces of the pressure distribution of the tensile stresses of the tape.

4. The roller according to claim 3, characterized in that the partial measuring head (3A, 3b) is made round and according to the government center rely on sensors (4) forces.

5. The roller according to claim 3, characterized in that the partial measuring head (3A, 3b) is made in the form of beam sensors and rely in the end zones of the beam on the sensors (4) forces.

6. The roller according to any one of p 5, characterized in that the sensors (4) power is made in the form of a piezoelectric quartz.

7. The roller according to claim 3, characterized in that the beam sensors are located at right angles or obliquely relative to the axis (8) of the clip.

8. The roller according to claim 3, characterized in that the surrounding partial measuring head (3A, 3b) gap (6) is added permanently elastic adhesive and/or sealing.

9. The roller according to claim 3, characterized in that the measuring head (3) contain more than two partial measuring heads (3A, 3b).

10. The roller according to claim 3, characterized in that the measuring head (3) and/or their partial measuring head (3A, 3b) is covered with a metal foil.

11. The roller according to any one of p-5, characterized in that it contains the casing, made of rubber, synthetic material or hard metal.

12. The roller according to claim 3, characterized in that two or more measuring heads (3) are located in each zone of the width of the tape.



 

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