Optoelectronics mode of measuring of the width and the crescent of moving sheet material

FIELD: the invention refers to measuring equipment.

SUBSTANCE: the mode includes construction of mathematics model of sheet based on measured coordinates of points of lateral edges of sheet material with the aid of linear multielement photoreceivers. Initially with the aid of an immovable first linear multielement photoreceiver coordinates of both lateral edges of the sheet are defined, with whose aid the second and the third movable linear multielement photoreceivers are located over correspondingly the left and the right edges so that optical axles of the photoreceivers were at most approached to normals constructed from controlled points belonging to the edges of the sheet, in accordance with received results a mathematics model is constructed, at that the width of the sheet for each measurement is determined as the value of the section on the mathematics model of the sheet between the controlled points belonging to the edges of the sheet and it is computed in accordance with the declared expression, and the crescent for the both edges is determined as the utmost distance between the edges of the model of the sheet and the section connecting the extreme points each of lateral edges of the model of the sheet.

EFFECT: increases accuracy and reliability of measuring of sheet material, increases quality of production.

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The invention relates to the field of rolling mills and are designed to control the width and sebomenoi sheet material, in particular for controlling sizes of sheet metal.

There is a method of measuring the transverse size of the car (RF Patent No. 2104483, IPC G 01 21/10, 10.02.1998), lies in the opposite scanning the two beams of opposite edges of the object and counting the pulses in each pair of relevant information pulses, the size variance from the baseline is defined as the ratio of the number of counting pulses in the even number of pairs of information pulses to the number of pairs of information pulses multiplied by a given spatial interval corresponding to the period of the sequence of counting pulses.

The disadvantage of this method is that horizontal translational movement of the object and change the thickness of the sheet leads to deterioration of measurement accuracy.

Closest to the present invention is fotoemulsii way of measuring the size of the moving body (USSR Author's certificate No. 335534, IPC G 01 In 11/04, 11.04.1972), namely, that the measured body projecting optical system to photoelectric Converter, convert it light in measuring electrical pulse whose duration is proportional to the measured RA is a measure. Define the measuring pulse as the sum of two signals, the first of which is proportional to the optical projection of the measured body size, and the second is the change in the length of the fronts of the first signal caused by defocusing the image projection of the measured size due to the movement of the body along the optical axis of the system.

The disadvantage of this method is the impossibility of measuring the body in a wide range of sizes, as well as the deterioration of the measurement accuracy when varying the thickness of the measured object.

The technical result - improving the accuracy and reliability of measurements of sheet material, the improvement of product quality.

To achieve a technical result in the proposed method of measuring the width and sebomenoi moving sheet material, including the construction of a mathematical model sheet, based on the measured coordinates of points of the side edges of the sheet material using a linear multi-element photodetectors, according to the proposal initially stationary first linear multi-element photodetector determine the coordinates of the both side edges of the sheet, with the help of which have a movable second and third linear multi-element photodetectors above, respectively, the left and right edges so that the optical axis of the photodetector would be the and as close to the normal, built from monitored points belonging to the edges of the sheet, while the coordinates of the edges of the sheet calculated by the expression:

for the left edges: Xi1=n2*P2-Fi2*P2,

for right edges: Xi2=n2*P2A +C+Fi3*P3,

where Fi2- the amount (in pixels) darkened when the oncoming light (illuminated when a straight line) of the photosensitive elements of the second photodetector, the Pro-rata portion of the sheet located in the measurement area of the second photodetector for i-Toto metering;

Fi3- the amount (in pixels) darkened when the oncoming light (illuminated when a straight line) of the photosensitive elements of the third photodetector, the Pro-rata portion of the sheet in the zone of measurement of the third photodetector for i-metering;

With the distance (in mm) between the measurement zones of the second and third photodetectors;

n2- the amount (in pixels) of the photosensitive elements of the second linear multi-element photodetector;

P2- the ratio of the measurement zone to the second photodetector to the number of photosensitive elements of the sensor (mm/pixel);

i - the number of the measurement;

P3- the ratio of the area of the third dimension of the photodetector to the number of photosensitive elements of the sensor (mm/pixel);

on the received results to build a mathematical model, thus the width of the sheet for each measurement is defined as the value of the cut on the mathematical model of the sheet between the controlled points of the edges of the sheet, and is calculated by the expression:

Si=Xi2-Xi1=Fi2*P2A +C+Fi3*P3,

and camber for both edges is defined as the greatest distance between the model edge of the sheet and a straight line connecting the extreme points of each of the side edges of the model sheet.

The method is illustrated in the drawings. Figure 1 presents an embodiment of the proposed method on the example of determining the width and sebomenoi sheet metal; figure 2 - model building sheet produced by the measurement and calculation of the width and sebomenoi.

The method is performed using device:

1 - fixed the first linear multi-element photodetector;

2 - rolling of the second multi-element photodetector located above the left-side edge of the sheet material;

3 - rolling of the third multi-element photodetector located above the right-side edge of the sheet material;

4 - non-contact measuring length;

5 - device positioning (movement) of the second rolling of a sensor, located above the left-side edge of the sheet material;

6 - device positionyou the deposits (movement) third rolling of the photodetector, located above the right-side edge of the sheet material;

7 is a computing and control unit;

8 - rail Converter linear movements.

The measurement method is as follows.

The measured sheet 9 moves along the conveyor 10 with velocity V. the contrast of the edges of the sheet in the area measurements provide direct or counter-illumination. When reaching a leaf area measurements L1a preliminary measurement of the coordinates of the position of the side edges of the sheet 9 with still the first line of the multi-element photodetector 1.

These coordinates are passed to a computing and control unit 7, which generates control signals to the positioning device 5, and 6. Under the influence of control signals positioning devices 5 and 6 move fixed on them the second 2 and third 3 linear multi-element photodetectors with measurement zones, respectively, L2and L3lying on one axis, the guide of the linear displacement transducer 8 so that the middle zone of measurement of each of these photodetectors coincided with a pre-measured coordinate of the corresponding side edges of the sheet 9. However, in General, fulfill the conditions:

where S is the distance (in mm) between the axis of the fixed per the CSO of the photodetector 1 and the axis of the second 2 and third 3 photodetectors;

V is a moving speed (mm/sec) measured sheet 9;

D2the area of possible displacements (in mm) positioning device 5 attached to it by the second photodetector 2 along the guide 8;

V2- movement speed (in mm/s) positioning device 5 attached to it by the second photodetector 2 along the guide 8;

D3the area of possible displacements (in mm) positioning device 6 attached to it by a third photodetector 3 along the guide 8;

V3- movement speed (in mm/s) positioning device 6 attached to it by a third photodetector 3 along the guide 8.

These conditions are necessary in order for the second 2 and third 3 photodetectors managed to take up the required position before moving the sheet 9 reaches the axis of the measurements of these sensors.

When the sheet 9 measurement zones L2and L3from the second 2 and third 3 photodetectors on computing and control unit 7 receives the values of the finally measured coordinates of the lateral edges of the sheet.

This contactless measuring length 4 transmits the current value of the length of the measured sheet on the processing control unit 7.

As in the proposed method, moving the second 2 and third 3 photodetectors in the process of measurement is positioned so that the middle of the measurement zones within the same position of the side edges of the measured sheet, the optical axis of the sensors as close to the normals N2and N3built from monitored points belonging to the projection of the edges of the sheet. In this case, the measurement error associated with different thickness measured sheet, minimum.

The results of measurements performed during the movement of the sheet of a computing and control unit 7, building a mathematical model of the measured sheet, which are its width and camber.

The coordinates of the edges of the sheet calculated by the expression:

for the left edges: Xi1=n2*P2-Fi2*P2,

for right edges: Xi2=n2*P2A +C+Fi3*P3,

where Fi2- the amount (in pixels) darkened when the oncoming light (illuminated when a straight line) of the photosensitive elements of the second photodetector 2, the Pro-rata portion of the sheet located in the measurement area of the second photodetector for i-metering;

Fi3- the amount (in pixels) darkened when the oncoming light (illuminated when a straight line) of the photosensitive elements of the third photodetector 3, the Pro-rata portion of the sheet in the zone of measurement of the third photodetector for i-metering;

With the distance (in mm) between the measurement zones of the second 2 and third 3 photodetectors;

n2- the amount (in pixels) f is locustville elements of the second linear multi-element photodetector 2;

P2- the ratio of the area of measurement of the second sensor 2 to the number of photosensitive elements of the sensor (mm/pixel):

where L2area measurements (in mm) of the second photodetector;

i - the number of the measurement;

P3- the ratio of the area of the third dimension of the photodetector 3 to the number of photosensitive elements of the sensor (mm/pixel):

where L3area measurements (in mm) of the second photodetector,

the results build a mathematical model, while the width of the sheet for each measurement is defined as the value of the cut on the mathematical model of the sheet between the controlled points of the edges of the sheet, and is calculated by the expression:

Si=Xi2-Xi1=Fi2*P2A +C+Fi3*P3.

Axis "Y" deposited evenly the length of the sheet is defined with the passage of the sheet in the area of measurement.

Camber Δ1and Δ2for each edge is the greatest distance between the points belonging to the model edge of the sheet, and a segment connecting points X1 1and Xk 1for the left-hand edge and X1 2and Xk 2- to the right edge of the sheet.

A special case of this method is its option of having a device which tion positioning sheet position one of its side edges is defined. In this case, the area of the first photodetector 1 covers an area of possible locations of the second edge of the sheet. The second photodetector 2 is stationary and the controls known location of the left edge of the sheet. The third sensor 3 remains active and monitors the area in the right-hand edge of the sheet, the location of which may vary depending on the width of the sheet. All ratios given for the General case, are stored here.

A distinctive feature of this method is the use of precise positioning of the movable photodetectors using the results of preliminary measurement of coordinates fixed by the first photodetector, thereby increasing the accuracy of the measurement of the width and sebomenoi sheet material regardless of its thickness. The application of the second and third movable photodetectors allows you to ensure the required accuracy of measurement when any sheet width without increasing the number of photodetectors. All this allows to monitor and adjust the operation of shears and other equipment, thereby increasing the quality of our products.

Optoelectronic method of measuring the width and sebomenoi moving sheet material, including the construction of a mathematical model sheet, based on measured coordinating the Oh points of the side edges of the sheet material using a linear multi-element photodetectors, characterized in that the initially stationary first linear multi-element photodetector determine the coordinates of the both side edges of the sheet, with the help of which have a movable second and third linear multi-element photodetectors on respectively the left and right edges so that the optical axis of the photodetector were as close to the normal, built from monitored points belonging to the edges of the sheet, while the coordinates of the edges of the sheet calculated by the expression:

for the left edges: Xi1=n2·P2-Fi2·P2,

for right edges: Xi2=n2·P2+With+Fi3·P3,

where Fi2- the amount (in pixels) darkened when the oncoming light (illuminated when a straight line) of the photosensitive elements of the second photodetector, the Pro-rata portion of the sheet located in the measurement area of the second photodetector for i-metering;

Fi3- the amount (in pixels) darkened when the oncoming light (illuminated when a straight line) of the photosensitive elements of the third photodetector, the Pro-rata portion of the sheet in the zone of measurement of the third photodetector for i-metering;

With the distance between the measurement zones of the second and third photodetectors, mm;

n2- the number is the primary objective of the photosensitive elements of the second linear multi-element photodetector, pixels;

P2- the ratio of the measurement zone to the second photodetector to the number of photosensitive elements of the sensor, mm/pixel;

i - the number of the measurement;

P3- the ratio of the area of the third dimension of the photodetector to the number of photosensitive elements of the sensor, mm/pixel;

the results build a mathematical model, while the width of the sheet for each measurement is defined as the value of the cut on the mathematical model of the sheet between the controlled points of the edges of the sheet, and is calculated by the expression:

Si=Xi2-Xi1=Fi2·P2A +C+Fi3·P3,

and camber for both edges is defined as the greatest distance between the model edge of the sheet and a straight line connecting the extreme points of each of the side edges of the model sheet.



 

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