Apparatus for measuring length of moving rolled strip

FIELD: rolled stock production.

SUBSTANCE: apparatus includes unit for measuring length; additional unit and converter forming signal for cutting. Additional unit is in the form of two slit type sliding guides mounted with possibility of measuring distance between them according to width B of rolled strip. Length of guides l = (18 - 21)√B, width of slits (0.05 - 0.07)B. Unit for measuring length of rolled strip is in the form of optical sensor on base of light sensitive matrix having in bottom portion inlet opening. Said sensor is connected with converter. Measuring unit is spaced by distance b = (0.15 -0.22)B from one lateral edge of rolled strip and it is mounted in such a way that distance from inlet opening of measuring unit till surface of rolled strip along height is equal to 3 - 5 mm.

EFFECT: lowered metal consumption, enhanced consumers' properties of rolled strip due to high accuracy of cutting it.

2 cl, 1 dwg, 1 ex

 

The present invention relates to the production of rolled products, including coatings, and can be used when cutting it to the specified length.

For exact cutting on such length of moving of the rolled strip are applied length measuring devices of various types (mostly Electromechanical and photoemulsion), the construction of which is described, for example, in the book Uracin and other “Technological measurements and devices in the rolling production”, M, metallurgy, 1973, s.255-266. A necessary element of the Electromechanical meters of length, usually installed on the units of cross cutting strips (APR), is a measurement of a cylindrical roller mounted on an axis in contact with the strip and rigidly associated with the sensor (impulsation) the number of revolutions of the roller per unit time.

A device for measuring the length of the car, containing a measuring roller is rigidly associated with speed sensor (resolver), and a roller mounted on the lower end anoplocephala lever provided with a spring and suspended from the frame (see U.S. Pat. GDR No. 29407, CL G 01 B from 25.07.64 year). It is also known a device for cutting to length, containing the system determine the length, count the number of pulses from the two photocell, between which there is cut a workpiece, and a computing node (see Franz. Pat. No. 1412557, CL 21 is, 23 D from 23.08.65 year). The disadvantage of these devices is the relatively low accuracy of determination of the length of the rolled strip, which leads to increasing the “spread” of the lengths of the cut sheets.

The closest analogue to the declared object is a device for measuring the length of the moving of the rolled strip in U.S. Pat. Of the Russian Federation No. 2058521, CL G 01 B 5/02 from 12.08.93,

This device contains a measuring length measuring roller and the auxiliary node and is characterized by the fact that this node consists of a support roller with a certain barrel length and a given diameter, and measuring and supporting rollers kinematically connected through the gears, and between the measuring roller and the gear can be installed trichodina kinematic connection that allows you to change the vertical distance between the rollers.

A disadvantage of the known device is relatively low accuracy of the cut length of the rolled strip.

Indeed, in the case of mutual slipping of the measuring roller and the moving of the rolled strip (for example, when passing her oiled area), as well as the wear of the roller (with decrease in the diameter) the error in determining the length, which reduces the accuracy of cutting and increase the “spread” of the lengths of the individual sheets. This n is inevitable leads to excess metal and the deterioration of consumer properties of sheet metal.

The technical object of the present invention is the reduction of metal consumption and improvement of consumer properties of rolled products by improving the accuracy of its cutting to length.

To address this problem, the device for measuring the length of the moving of the rolled strip, mainly sheet, cut to length, containing the probe length and the auxiliary node is equipped with a Converter that outputs a signal to perform the cut, while the auxiliary unit is designed in the form of two slotted transaction slip, installed with the possibility of changing the distance between them in accordance with the width of the rolled strip, having a length ofand the width of the slits (0,05-0,07), and measuring the length of the rolled strip is made in the form of an optical sensor based on the photosensitive matrix with the input hole in the bottom part, associated with the Converter, and is set at the distance b=(0,15-0,22)from one of the side edges of the rolled strip and at a height of 3-5 mm from the inlet of the meter to the surface of the rolled strip, and slotted the transaction slip can be made of textolite.

The mathematical ratio obtained by processing the experimental data and are empirical.

The essence of the proposed technical what about the solution is, first, to use as a measuring device (sensor) of the length of moving of the rolled strip of high-precision optical sensor based on the photosensitive matrix with the inlet at the bottom and, secondly, in creating, with the help of an auxiliary node such conditions for the operation of the meter, which exclude him touch the moving surface of the rolled strip (this can get the sensor from the system and provide the necessary accuracy.

It is known that a strip car almost always has a variation of flatness or its boundary (edge) sites (waviness), or medium-bandwidth sites (karabatos - see, for example, the book Udelezba and other Statistical studies of the accuracy of the hot strip rolling”, M.: metallurgy, 1974, p.53 and 29), and this variation of flatness of a certain magnitude allowed by the corresponding standards.

If you do not take any special measures in order to avoid the touch strip car (its raised vertical sections of the optical sensor, it must be raised above the metal to a height of more than 20 mm (this is the maximum allowable amplitude of the waviness of the rolled strip)that will make it impossible for precise determination of the length. Fundamentally, you can skip the moving strip car through the complete transaction is algenia sufficient length and its surface scan sensor through the hole in one of the transactions. However, this dramatically increases the possibility of injury to the moving surface of the rolled strip, in particular coated (galvanized, tinned etc)that will lead to its rejection.

Empirically (see below) it was determined that the transaction slip mounted on edges of the rolled strip, must be above the minimum length l and the width of the gap b1” to eliminate waviness. In addition, as shown by the same experiments, karabatos (waviness in the middle of the width of the rolled strip) is not more than one-third and one - half In, which makes it possible to secure the installation of the meter at a specified distance from any of the Postings and at a predetermined height from the surface of the metal. The sizes of the transactions guarantee the absence of defects, which lead to the rejection of the leaves.

The proposed device is schematically shown in the drawing (a) lateral view, b - top view).

Transaction slip 1 is installed with the possibility of changing the distance' between them by moving edges of the rolled strip 2 width (the arrow shows the direction of its motion). Length transactionsthe width of the slits b'=(0,05-0,07)In. At a distance of b=(0,15-0,22)from one of the edges of the rolled strip (figure 1 - l is whining) about the mid-length transaction and at a height of 3...5 mm from the moving of the rolled strip is installed meter of length 3 with the inlet 4 at its bottom, through which is scanned (and the reference length) of the metal surface, due to reflected from it, a narrow light beam emitted by the sensor. The probe 3 is connected to the inverter 5, giving impetus to the drive control of the scissors (for example, flying drum) to perform the cut.

For the measurement of the transaction 1 is installed at a distance' between them, which corresponds To the width of the measured of the rolled strip 2, and 3 meter above the passband of the Bicycle and at a distance b from one of its edges. When the movement of the rolled strip with waviness to edges in the crevices of the transactions with a length l between Postings wave practically disappears (at the expense of some increase in buckling and reduction of wavelengths before and after the transactions), which allows to measure the length of the rolled strip with great accuracy (see below).

Experimental validation of the proposed device was carried out in the plate rolling shop №7 OJSC “Magnitogorsk iron and steel works”. To this end, the device produced a length measuring moving at speeds up to 0.5 m/s steel of the rolled strip (dry and oiled), and galvanized sheet steel and sheet metal of different thicknesses (from 0.45 to 2.5 mm). As the meter used an optical mouse USB 3D.

Previously, cold-rolled strip steel was predelena relationship waviness parameters (wavelength and amplitude) and of the rolled strip. It was found that the waviness parameters practically do not depend on the thickness of the metal, but they are directly proportional to the width of the rolled strip. Thus was obtained the formula (see above) to determine the minimum allowable length transactions, so as to increase their length increases the chance of injury to the moving surface of the rolled strip. Testing different materials for the transactions showed that the most acceptable is the PCB (ornamental, brand PTC).

The best results - determination of the length of the rolled strip with an accuracy of 0.05-0.1% - were received on the device proposed design. Deviations from the declared parameters worsened the results.

So at length transactionsvariation of flatness of the rolled strip between them was more than 5 mm, which caused the necessity of increasing distance from the operating orifice meter with a corresponding decrease in the accuracy of the measurements. When l moreit was observed the occurrence of inadmissible marks and scratches on the edges of the rolled strip. This has led, and increases the width of the slit transactions b' 0,B, and when b' is less than 0,V increased the amplitude of the waviness. When the distance from the bottom of the meter to the surface of the rolled strip is less than 3 mm were cases of touch metal the Ohm meter with negative consequences.

Measurements of the lengths of using the device selected as the closest analogue (see above) and installed on units 1-4 and 1-5” sheet-rolling shop №7 OJSC “MMK”, showed that the accuracy of these measurements is 0.4...0.5 percent.

Thus, experimental verification found solutions has proven its suitability for achieving the objectives and advantages over the known object.

A feasibility study conducted in the Central laboratory of OJSC “MMK” has shown that increasing the accuracy of determining the length 4-5 times during the cutting of the rolled strip to length will reduce the consumption of metal not less than 0.3%, and will improve consumer properties of rolled sheet by reducing the “scatter” lengths (i.e. decreasing the difference between the minimum and maximum lengths of sheets in one bundle).

Specific example

Device for measuring the length of the moving of the rolled strip has the form shown in figure 1, and is intended to be of the rolled strip with B=1500 mm, thickness 1.5 mm

Length textolite transactionsthe width of the slit - 0,V=0,06×1500=90 mm

At a distance of b=0,185·=0,185·1500≈278 mm from the left-side edges of the rolled strip and at a height of 4 mm from its surface mounted meter length in the form of an optical sensor based on sitecounter the second matrix with the entrance hole at the bottom, provides accurate measurement of 0.08%. “Fuzziness” of length for cutting sheets with a length of 5 m does not exceed 4 mm

1. Device for measuring the length of the moving of the rolled strip, mainly sheet, cut to length, containing the probe length and the secondary node, characterized in that it is provided with a Converter that outputs a signal to perform the cut, while the auxiliary unit is designed in the form of two slotted transaction slip, installed with the possibility of changing the distance between them in accordance with the width of the rolled strip, having a length ofand the width of the slits (0,05-0,07), and measuring the length of the rolled strip is made in the form of an optical sensor based on the photosensitive matrix with the input hole in the bottom part, associated with the Converter, and is set at the distance b=(0,15-0,22)from one of the side edges of the rolled strip and at a height of 3-5 mm from the inlet of the meter to the surface of the rolled strip.

2. The device according to claim 1, characterized in that the slotted transaction slip is made of textolite.



 

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