Device and method for noncontact measurement of curvature of long object

FIELD: machine building.

SUBSTANCE: device and method is intended to be used at measurement of curvature through certain base length of object (2t), for example per 1 running metre and maximum curvature through the whole length of the object. The basis of measurements is proximity sensors. Condition of measurements is straight-line movement of the object. There can be deviations at movement in the form of transverse offsets and vibration. In order to relate measurements to length and to compose the object curvature chart, speed sensor is used. Enough number of sensors will be log2(L/t)+2 sensors. They are located at distances of (t, t, 2t, 4t, 8t, 16t,…) between each other, where t - half of the base distance for curvature measurement.

EFFECT: device allows reducing the number of involved sensors at curvature measurement.

2 cl, 7 dwg

 

Description of the invention

The invention relates to the field of measurement technology and can be used for automated control of curvature different long objects, such as related to products rolling and pipe industries, in the process stream.

A device for measuring the geometrical dimensions of the rail, the description of the invention to the patent of Russian Federation №2314953, CL B61K 9/08, E01B 35/00, 2006), which includes a sensor platform, which has six optical sensors, three of which control the upper surface, three - side surface, at the beginning, center and end of the rail. The main disadvantage of this device is that measurements must be made "senegalian" object, hence the conclusion about impossibility of measurement in the process stream without reducing the pace of work.

Also known device for controlling the deflection of the rail, the description of the invention to the patent of Russian Federation №2333858, CL B61K 9/08, E01B 35/02, 2005), which includes a sensor platform, which is equipped with three optical sensors that control the rail at its beginning, the end and the middle, in the same plane. This device works on the shadow principle of optical measurements. The disadvantage is that there are restrictions on the transverse size of the object: it must bituminise, than used the illuminator. In addition, there is the possibility of measuring the curvature of the object on the entire length.

Also in the above devices, there is no possibility of control of curvature of the object on the base length of the object, such as 1 meter, another disadvantage is that these devices are intended for measurements of objects with a constant length.

A device for controlling the radius of curvature of the surface (the description of the invention to the U.S. patent No. 20080289205, CL G01B 3/16, G01B 3/00, G01C 3/08, G01S 3/80, 2008), consisting of a base with a fixed non-contact sensors measure the distance between the sensor and the surface to be measured. This device on the sensor calculates the radius of curvature. The described device can be used to measure the curvature of a moving elongated object, constructing the map of curvature of the surface you want to put a single measurement. The total measurement error for the entire length of the object will consist of errors of single measurements. Thus, the total measurement error of curvature of the object increases with the length of the measured object, which is a disadvantage of the specified device.

Closest to the proposed invention is a device for controlling pramol is nanosci rails (the description of the invention to the patent of Russian Federation №2283792, CL B61K 9/08, G01B 15/04, 2004), selected as a prototype. The device contains at least three radio frequency sensors for contactless measurement of the distance to the surface of the rail. Evaluation of the curvature depends on the size of the gaps between the stationary radio-frequency sensors and controllable surfaces of the rail, using spline interpolation.

A disadvantage of the known device is the low accuracy of determination of the magnitude of the curvature calculated using spline interpolation. To achieve accuracy, acceptable under the control of the car, it is necessary to increase the number of sensors that simultaneously leads to an increase in computation time curvature value.

The aim of the invention is to remedy these disadvantages, improving the accuracy and reliability of measurement, reducing the number of sensors when measuring long objects, minimizing the cost of implementation and subsequent maintenance, improve product quality, measurements of curvature of the object for a specified length (for example, 1 m) and over the whole length with the same error.

The proposed device and a method of measuring the curvature of long objects eliminates the described disadvantages, allows the measurement of the curvature in terms of vibration and the transverse displacement of a moving object and provides in order to minimize the number of deployed sensors.

A device and a method of measuring the curvature of long objects are intended for use in the measurement of the curvature on the base distance (length 2t), such as 1 meter, and the maximum curvature throughout the length of the object. The measurements are the sensors the distance to the object, attached to a fixed base. As sensors can be used for a different sensor type: optical, inductive, capacitive, laser, etc. the sensor Readings are received in the unit of analysis and information processing, which is performed subsequent calculation. Condition measurements - rectilinear motion of the object. May be present deviation during movement in the form of transverse displacements and vibrations.

In addition, for binding measurements for length and mapping of curvature of the object readings used speed sensor, which may be optical or mechanical type.

The spatial arrangement of the sensors is shown in figure 1.

The measurements are taken in a plane passing through the axis of the object. If necessary the measurement of curvature of the object in two perpendicular axes, set the additional number of sensors at an angle of 90 degrees to the first row.

To measure the curvature of the object on the base a distance of length 2t, there are three sensor distance to the objectD1,D2,D3, RAS is consistently than necessary along the movement of the object at the distance t from each other, figure 2. The sensors produce simultaneous measurement of the distances to the surface of the objectR1,R2,R3during the movement.

Measurement of the curvature of length 2t (base curvature) is relative and is defined as

CUR=R2-(R1+R3)/2

Binding measured curvature on the base length of 2t to the speed of the object obtained from the velocity meter, allows, after the release of the object from the zone of measurement, to create a map of curvature of the object. Thus, a measure of the curvature of length 2t in each point of the object.

At the same time by the above method are the measurements of the curvature of the three sensorsD1, D3, D4- the length of 4t,D1, D4, D5- the length of 8t, etc.

Thus, after the release of the object from the zone of measurement is known, the curvature at each point of the object in the plane of measurement at multiple scales of measurement. This allows you to build a map of the curvature of the pipe with 100% coverage measurements. Analysis of the map of the curvature allows to determine the maximum curvature on the base length and the curvature attributable to the entire length of the object.

The unit of analysis and information processing performs the algorithm for constructing maps of curvature of the object in the following steps.

1. Selects the measurement of the curvature scale, the maximum overlapping object length, the Central value of which corresponds to the center of the object (see figure 3). Absolute C is achene selected measurement shall be made in the resulting map of curvature of the object and are considered as a reference. Further mapping will be made relative to the reference point.

2. Searched measuring the curvature (of the received values in the scale two times less than the reference, such that the side of the measuring point converge (linking in length) with the extreme and center points of the reference measurement. The absolute values of the points found by measuring geometrically reduced with a reference measurement of the curvature so that the lateral coordinates of the points coincide with the coordinates of the lateral and Central points of the reference measurement (see figure 4). As a result of operation obtained a new coordinate of the center point of the found measurement, with reference to a reference measurement of curvature, and two-time refinement of the final map of the curvature (see figure 5).

3. The operation of the refiner card curvature recursively performed until the distance t (see Fig.6).

4. Building a map of the curvature at the edges of the reference measurement is performed by means of increasing the difference between the absolute measurements made at one time from sensors located at a distance of t, 2t, 4t, 8t, etc. (see Fig.7).

5. On the ends of the object, which are not covered by one increment, is re-increment. The sensors are located so that the maximum required number of increments is equal to two.

The result of these operations get the full map Cree is Isny, without the effects of vibrations and displacements, for which the calculated maximum curvature of the object, over the entire length.

The novelty of the invention lies in the arrangement of the sensors at distances, allowing to reduce their total number for the simultaneous measurement of curvature of the object over the whole length and base length 2t no need to install L/t sensors (when the length of the object L). A sufficient number will be log2(L/t)+2 sensors. If this measurement error will remain unchanged for any length of the measurement object.

1. A method of measuring the curvature of the long-length object, namely, that to measure the curvature at the base of the longitudinal section of the object length is 2t and the maximum curvature on the whole length of the object sensors are used (optical, inductive, capacitive, laser, etc.) the distance to the object, characterized in that the sensors are located between the distances (t, t, 2t, 4t, 8t, 16t...), where t is half the base distance for measuring curvature and requires log2(L/t)+2 sensors, where L is the length of the object; t - half the base length.

2. Device for measuring the curvature of the long object containing the sensors, the distance to the object (optical, inductive, capacitive, laser, etc.), characterized in that requires the sensors to which icesto log 2(L/t)+2, where L is the length of the object; t - half the base distance, the sensors are located along the object on the distance between a (t, t, 2t, 4t, 8t, 16t...), where t is half the base distance for measuring curvature, where the device further comprises measuring the speed of the object and the unit of analysis and information processing.



 

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