RU2458318C2 - Optoelectronic device for sheet products thickness control - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: device contains massive solid foundation with measurement zone, optoelectronic heads located on both sides of sheet products, longitudinal electric drive with rollers for sheet products feeding to measurement zone, lateral electric drive for moving optoelectronic heads perpendicularly the direction of sheet products feeding and personal computer (PC). Each of optoelectronic heads has emission source, position-sensitive photoelectric detector and focusing and receiving lens system. PC inputs are connected to photoelectric detector outputs, and outputs - to electric drive inputs. Device has a carriage with U-shaped holder, on the opposite ends of which there are optoelectronic heads, fans with air filters built-in the optoelectronic heads casing. The foundation is made in the form of a gantry, along the horizontal beam of which there are guide ways for carriage movement; the gantry is equipped with parking zones for optoelectronic heads formed by U-shaped protective screens attached to the foundation. Emission sources have emission wave length less than 0.63 microns. Each of optoelectronic heads is equipped with light filter that is located in front of the receiving lens system and adjusted on the range of wave lengths of emission source of this optoelectronic head.

EFFECT: provision of hot sheet products thickness control in production conditions without operating process stop.

6 cl, 8 dwg

Description

The invention relates to a control and measuring technique, and more particularly to means for contactless control of sheet products, and can be used in ferrous and non-ferrous metallurgy to measure (control) the geometric parameters of hot sheet metal under production conditions without stopping the process.

The establishment of the prior art.

Currently, there is a fairly wide variety of methods and means of controlling the thickness of sheet products. The choice of the appropriate method and means of control depends on the size of the subject’s geometric dimensions, the required measurement accuracy, the material from which the object is made, the conditions under which control should be carried out, and other factors.

In the case under consideration, from the whole variety of methods and means of measurement and control, only those that are used in automatic measurement and control should be considered. They are divided into contact and non-contact.

Contact methods and controls are based on direct contact of the meter with the surface of the sheet product. The controlled product is placed on a flat surface of the desktop. During measurements, mechanical feeling of the test object is carried out by means of a measuring tip. The movement of the tip by the displacement sensor is converted into an electrical signal or transmitted directly to the indicator. Knowing the base distance between the meter and the surface of the desktop, you can set the thickness of the product. [12].

Disadvantages: tip shape and pressure force affect control results. In addition, the measuring tip is subject to significant mechanical wear.

Conventionally, contact method may include a method in which the gap between the rolls of rolling mills is measured. Next, the known gap value is subtracted from the obtained value at zero strip thickness and a correction for roll deformation is introduced [3].

Contactless methods and means of controlling the thickness of sheet products are generally free from the above disadvantages.

Known non-contact optoelectronic devices for controlling the thickness of sheet products containing a radiation source and receiver, a lens, a unit for generating triggering pulses, a selection unit and a counter for video pulses, a scale bar and a light panel [4, 5].

Disadvantages: design complexity, the effect of vertical sheet vibrations on the measurement accuracy.

Known non-contact optoelectronic devices for controlling the thickness of sheet products containing two optoelectronic heads located on opposite sides of the object of control [6-9].

The placement of the object of control between two rigidly connected optoelectronic heads eliminates the influence on the accuracy of measuring its vertical vibrations during movement, since at these displacements of the object, the sum of the distances from the optoelectronic heads to its surface remains constant.

Known optoelectronic devices for controlling the thickness of sheet products containing two optoelectronic heads mounted on opposite sides of the controlled object and each consisting of a radiation source, lenses and a linear or multi-element position-sensitive photodetector, the output of which is connected to the corresponding input of the information processing unit, for example, personal electronic computing machine (PC) [10-12].

Such devices are characterized by the complexity of the circuit design.

Known non-contact optoelectronic devices for controlling the thickness of sheet products, also containing two or more optoelectronic heads mounted on opposite sides of the controlled object and consisting of each radiation source, lenses and linear or multi-element position-sensitive photodetectors, the outputs of which are connected to the corresponding inputs of the information processing unit [13-16].

These devices work according to complex algorithms that provide measurement of the thickness of products for cases when the rays of the optoelectronic heads "fall" onto a controlled surface at angles other than 90 °.

Also known is an optoelectronic device for controlling the thickness of sheet metal, containing two forming and receiving systems placed symmetrically on opposite sides of the controlled object. Each of the forming systems includes a radiation source (laser), a collimating lens installed in series along its radiation, in the focal plane of which a light flux modulator, an optical wedge, which diverts part of the light flux to the photodetector and the first scanning element, consisting of a rotary platform with an angular sensor and a mirror mounted on it. Each of the receiving systems includes an image forming lens, a second scanning element, a detector made in the form of a four-quadrant photodetector, and a set of light filters, which includes an interference filter for the working radiation wavelength. The device also includes a processing unit equipped with a synchronous detector, and a control PC [17].

The luminous flux of the source passes through a collimating lens, a light flux modulator, a wedge, which diverts part of the luminous flux to the photodetector, and enters the scanning element of the forming system. Reflecting from her mirror, the light flux enters the controlled object. The processing unit determines the angle between the optical axis of the forming system and the direction of incidence of the light flux on the controlled object and then stores it in the memory of the control PC. From the controlled object, diffuse scattered radiation enters the scanning element of the receiving system. Reflecting from its mirror, the light flux passes through a set of filters, the lens and enters a four-quadrant photodetector. From it, the signal enters the processing unit. A set of light filters allows only the working wavelength to pass through, partially cutting off the background radiation that is present in the production of hot rolled products. The processing unit is in electrical communication with the rotary platform of the receiving system and, after analyzing the incoming signal, gives a command to search for the maximum intensity of the light flux in diffuse scattered radiation. After the specified maximum is found, the processing unit determines the angle between the optical axis of the receiving system and the direction of the maximum intensity of the diffuse scattered radiation. The obtained values allow using the triangulation method to obtain data on the distance from the scanning elements to the controlled object and, further, calculate its thickness.

The disadvantage of this device is the complexity of its settings, the criticality of the interference filter to temperature, vibration, as well as to the instability of its spatial position.

Characterization and criticism of the prototype.

The closest invention to the proposed according to the greatest number of similar features, technical nature, circuit design and achieved using the technical result is an optoelectronic device for controlling the thickness of sheet metal, described in [18].

Such a device, selected as a prototype, contains:

- a massive fixed base, made in the form of a desktop with a measurement zone,

- two optoelectronic heads located on opposite sides of the sheet metal, each of the optoelectronic heads formed from a radiation source, a position-sensitive photodetector and focusing and receiving lenses, and the optical axis of the radiation sources of the optoelectronic heads lie on one straight line,

- a longitudinal electric drive with rolls that supply sheet metal to the measurement zone,

- transverse electric drive, providing movement of the optoelectronic heads in the measurement zone in the direction perpendicular to the direction of supply of sheet metal,

- and a personal electronic computer (PC), the inputs of which are connected to the outputs of position-sensitive photodetectors of optoelectronic heads, and the outputs are connected to the inputs of longitudinal and transverse electric drives.

This device does not provide measurements in the conditions of the production of hot rolled products, since the hot rolled itself gives a strong background radiation, as a result of which the photodetector does not sufficiently emit light from the source (laser), which ultimately reduces the reliability of the control.

The technical result and its achievement.

The present invention is aimed at achieving a technical result, namely, providing the ability to control the thickness of hot sheet metal during operation of the device in production conditions without stopping the process.

The achievement of the specified technical result is ensured by the fact that the known optoelectronic device for controlling the thickness of sheet metal, containing:

- massive fixed base with a measurement zone,

- optoelectronic heads located on opposite sides of the rolled sheet, each of the optoelectronic heads being formed from a radiation source, a position-sensitive photodetector and focusing and receiving lenses, and the optical axis of the radiation sources of the optoelectronic heads lie on one straight line,

- a longitudinal electric drive with rolls that supply sheet metal to the measurement zone,

- transverse electric drive, providing movement of the optoelectronic heads in the measurement zone in the direction perpendicular to the direction of supply of sheet metal,

- and a personal electronic computer (PC), the inputs of which are connected to the outputs of position-sensitive photodetectors of optoelectronic heads, and the outputs are connected to the inputs of longitudinal and transverse electric drives,

also contains

- U-shaped holder, at the opposite ends of which optoelectronic heads are installed,

- a carriage on which a U-shaped holder is fixed,

- fans built into the body of the optoelectronic heads and equipped with air filters,

- the base is made in the form of a portal, along the horizontal beam of which guides for moving the carriage are placed, and is equipped with parking areas for optoelectronic heads formed by U-shaped protective screens attached to the base,

- in each optoelectronic head a radiation source is used with a radiation wavelength range of less than 0.63 μm,

- and each of the optoelectronic heads is equipped with a light filter placed in front of the receiving lens and tuned to the radiation wavelength range of the radiation source of this optoelectronic head.

Besides,

- longitudinal and transverse electric drives are made reversible;

- the ends of the rails are provided with stops restricting the movement of the carriage;

- one of the rolls in front of the measurement zone is equipped with a water-cutter installed above it, made in the form of a metal frame, on the bottom of which a strip of thermo-rubber is fixed along the roll, while the projection of the frame onto the roll surface forms an acute angle with the roll forming;

- protective screens of parking zones for the convenience of servicing optoelectronic heads are equipped with removable panels;

- fans of the optoelectronic heads are connected to the PC outputs.

The applicant has not found a device in which the technical result is achieved by a similar set of essential features. Moreover, the analysis of the prior art, including a search by patent and other scientific and technical sources of information and identification of sources containing information about analogues of the invention, made it possible to establish that there are no analogues characterized by features identical to all the essential features of the invention, and the selection from the list of analogues the prototype provided the identification of a set of essential in relation to the technical results of the distinguishing features of the claimed invention.

The applicant has also verified the compliance of the specified set of essential features of the device with three conditions (criteria) of patentability.

Verification of compliance of the claimed device with the patentability condition "Novelty".

The main features that distinguish the claimed device from the closest analogue of the prototype are:

- the presence of a U-shaped holder, at the opposite ends of which optoelectronic heads are installed,

- the presence of a carriage on which a U-shaped holder is fixed,

- the presence of fans built into the body of the optoelectronic heads and equipped with air filters,

- the implementation of the base in the form of a portal, along the horizontal beam of which guides are placed for moving the carriage, and supplying it with parking areas for optoelectronic heads formed by U-shaped protective screens attached to the base,

- the use of a radiation source in each optoelectronic head with a radiation wavelength range of less than 0.63 μm,

- supplying each of the optoelectronic heads with a light filter placed in front of the receiving lens and tuned to the radiation wavelength range of the radiation source of this optoelectronic head.

Besides,

- the implementation of the longitudinal and transverse electric reversible;

- supplying the ends of the guides with stops restricting the movement of the carriage;

- supplying one of the rolls in front of the measurement zone with a water cutter installed above it, made in the form of a metal frame, on the bottom of which a strip of thermo-rubber is fixed along the roll, while the projection of the frame onto the roll surface forms an acute angle with the roll forming;

- supply of protective screens for parking zones for ease of maintenance of optoelectronic heads with removable panels;

- connection of fans of optoelectronic heads to PC outputs.

The presence of these features ensures compliance of the totality of features with the condition of patentability “novelty”. However, no devices were found in which the technical result was achieved by a similar set of essential features.

Verification of compliance of the claimed device with the condition (criterion) of patentability "inventive step".

To verify compliance with the requirements of inventive step, the applicant conducted an additional search and analysis of solutions in order to identify signs that match the signs that are absent in the selected prototype, the results of which showed that the claimed object does not explicitly follow from the prior art defined by the applicant.

In other words, a comparison of the claimed device not only with the prototype, but also with other technical solutions in this and related areas of instrumentation has shown that the latter do not contain features similar to those distinguishing the claimed technical solution from the prototype. The above allows us to conclude that the claimed object meets the condition of patentability "inventive step" under applicable law.

It should be noted that there is a causal relationship between the totality of the essential features of the present invention and the achieved technical result, since distinctive features were not identified in any of the analogues, and the achieved technical result is achieved only when all known and distinctive features are used together .

A brief description of the drawings. SUMMARY OF THE INVENTION

The invention is illustrated by drawings:

- figure 1 shows a front view of the device;

- figure 2 shows a top view of the device;

- figure 3 shows views of the base and holder of the device from the end and side (view aa);

- figure 4 shows the electrical connection in the device;

- figure 5 and 6 shows the design of the water cutter device;

- Fig.7 shows the trajectory of the light spot along the surface of the sheet metal when measuring its length and width;

- Fig. 8 shows:

Fig, a is the spectral distribution of the background radiation of hot sheet metal, where And _f.i. - the amplitude of the background radiation;

8, - a spectrum of the radiation source optoelectronic head, where K _II - coefficient characterizing the spectrum of the radiation source (laser);

Fig. 8c is a spectral transmittance of a light filter of an optoelectronic head, where N _sf is a transmittance of a light filter;

Fig.8d is the spectral sensitivity of the photodetector, where F _fn is the spectral sensitivity coefficient of the photodetector.

Description of the design of the device (in statics).

The optoelectronic device for controlling the thickness of sheet metal contains (Fig.1-6):

- massive fixed base 1 with a zone of 2 measurements,

- U-shaped holder 3, at the opposite ends of which optoelectronic heads 4 and 5 are mounted, located on opposite sides of sheet metal 6,

- a carriage 7 on which a U-shaped holder 3 is fixed,

- longitudinal 8 and transverse 9 electric drives (figure 4),

- fans 10, built into the body of the optoelectronic heads 4 and 5 and equipped with replaceable air filters 11 (figure 4),

- a water cutter 12 mounted above one of the rolls 13 to the measurement zone 2 (Figs. 1, 5, 6),

- and a personal electronic computer (PC) 14 (Fig.2, 4).

The base 1 is made in the form of a portal, along the horizontal beam of which there are guides 15 for moving the carriage 7 and has parking zones 16 for optoelectronic heads 4 and 5, formed by U-shaped protective screens 17 attached to the base 1. At the same time, the protective screens 17 of the zones 16 parking lots for ease of maintenance of the optoelectronic heads 4 and 5 are equipped with removable panels (not shown), and the ends of the rails 15 also have stops 18 that limit the movement of the carriage 7. The base 1 is rigidly fixed to the foundation 19.

Each of the optoelectronic heads 4 and 5 (Fig. 4) is formed from a radiation source 20, a position-sensitive photodetector 21, focusing 22 and. receiving 23 lenses, and a filter 24, placed in front of the receiving lens 23, and the optical axis of the radiation sources 20 of the optoelectronic heads 4 and 5 lie on one straight line.

In each optoelectronic head 4 and 5, the radiation source 20 is a source with a relatively narrow range of radiation wavelengths, and the wavelengths in this range are selected to be less than 0.63 μm. For example, in the device implemented by the applicant, the source 20 is based on a laser model DL-LS5010 of the Japanese company Sanyo with a radiation wavelength of about λ = 0.405 μm (in the "purple" range).

Note. At a wavelength of about 0.63 μm, the “red” spectrum of hot rolled 6 has a maximum amplitude.

The filter 24 is tuned to the radiation wavelength range of the radiation source 20, i.e. passes only the "appropriate" spectrum, cutting off a significant part of the "red" spectrum of hot sheet metal 6.

Structurally, the heads 4 and 5 are located on opposite sides of the controlled sheet metal 6 and are attached to the holder 3 so that the beam of the source 20 from the upper head 4 is directed vertically downward, and from the lower head 5 - vertically upward.

The water cutter 12 is made on the basis of a metal frame 25, to the bottom of which along the roll 13 is attached a strip 26 of thermo rubber, while the projection 27 of the frame 25 on the surface of the roll 13 forms an acute angle α with the forming 28 of the roll 13.

Longitudinal 8 and transverse 9 electric drives are made reversible. At the same time, the longitudinal electric drive 8 is connected with the rollers 13 and together with them provides the supply of sheet metal 6 to the measurement zone 2, its output from there upon completion of the control procedure for placement in the receiving drive 29 or for moving the sheet in the opposite direction if necessary to perform repeated control (Fig. .12).

The transverse electric drive 9 provides the movement of the holder 3, and therefore, the optoelectronic heads 4 and 5 in the measurement zone 2 in mutually opposite directions perpendicular to the feed direction of the rolled sheet 6.

Sheet metal 6 can be supplied for control, for example, after the crimp rolls of the stand 30. In this case, the rotation of the rolls 13 and the crimp rolls of the stand 30 is synchronized.

The inputs of the PC 14 are connected to the outputs of the position-sensitive photodetectors 21 of the optoelectronic heads 4 and 5, and the outputs are connected to the inputs of the longitudinal 8 and transverse 9 electric drives, as well as fans 10.

General control over the operation of the device is carried out by the operator 31 (figure 2).

Purpose, functions and features of the structural elements of the device.

The base 1, made in the form of a massive portal, is the main supporting and connecting structural element of the device and ensures its rigidity and stability during measurements.

The holder 3 is designed for synchronous movement of the optoelectronic heads 4 and 5, placed on opposite sides of sheet metal 6.

The carriage 7 is a structural element designed to move the holder 3. Equipped with an electric drive 9.

The position-sensitive photodetector 21 can be implemented on the basis of the CMOS photo line and is designed for optoelectronic conversion of the incident light beam.

Fans 10 are designed to provide excess air pressure inside the optoelectronic heads 4 and 5, thereby preventing dust and other suspended particles from entering there, and also preventing the temperature inside the heads from rising. In this case, the air filters 11 provide filtering of the air entering the heads.

Protective shields 17 are designed to protect the optoelectronic heads 4 and 5 from exposure to light and mechanical damage.

The cage 30 with the corresponding crimping rolls provides crimping of sheet metal 6.

The water cutter 12 “squeezes” water from the rolled sheets 6, which is used to cool the rolls. Water should not fall on hot sheets, as the resulting “balls” of boiling water on the surface of sheet 6 will lead to distortions of the measured profile and increase the measurement error.

The principle of operation and operation (description of the device in dynamics).

Before control, sheet metal 6 should have a clean surface - its measured areas should be cleaned of water, rust, oil products, etc., i.e. on its surface there should not be any contaminants affecting the thickness of the test object.

Before starting work, a control program, reference values for sheet thickness, sheet thickness tolerances and other data are recorded in the memory of the PC 14.

Initially, the optoelectronic heads 4 and 5 are in the initial position — parking zone 16, inside the protective shields 17. At the command of the PC 14, the fans 10 begin to work.

Optoelectronic heads 4 and 5 are the main measuring elements of the device and are designed to measure the distance to the surface of the sheet 6 by the method of optical triangulation. The principle of operation of the triangulation meter is based on measuring distances from two given points of space, located on opposite sides from the controlled sheet metal 6, to its surface, with a known distance between these points:

where h is the thickness of the rolled sheet 6;

T is the distance between the given points of space located on different sides of the rolled sheet 6;

Z ₁ and Z ₂ - respectively, the distance from these points to the surface of sheet metal. The light radiation from the source 20 with the help of a focusing lens 22 is converted into a small light spot on the surface of sheet metal 6 (with a diameter of about 0.1-1.0 mm).

The radiation scattered by the surface of the rental 6 passes through a filter 24 tuned to the radiation wavelength range of the radiation source 20, i.e. the filter 24 passes the luminous flux of only the working wavelength, largely cutting off the background radiation of the hot rolled 6.

The radiation transmitted through the filter 24 by the receiving lens 23 is collected on the CMOS line 21, creating an image of the indicated light spot on its photosensitive surface. Line 21 converts the light spot into the corresponding electrical signals supplied to the PC 14.

A change in the thickness of the rolled product 6 causes a corresponding movement of the light spot on the ruler 21. In other words, with this change in the distance to the surface of the rolled sheet 6, the movement of the light spot occurs, and therefore its image on the photodetector 21. The coordinates of the light spot on the latter are calculated by the PC 14 according to the parameters of the incoming from a photodetector of signals. The thickness of the sheet 6 is determined by the formula (1).

The obtained thickness values are programmatically compared in a personal computer 14 with a reference thickness value. If the deviations of the thickness value of sheet 6 do not exceed the specified tolerances, sheet 6 is sent for further processing, if not, it is rejected.

With simultaneous movement in the measurement zone 2 of the measurements of sheet metal 6 and the heads 4 and 5 with respect to the metal 6, it is possible to measure the distribution of the metal thickness along the scan line, its cross section (Fig.7).

The determination of such parameters of sheet metal 6 as its length and width is based on the software detection of a sharp change in the thickness value when a light spot hits the edge (edge) of the sheet:

where L _∂ and L _W - respectively, the length and width of sheet metal;

X _to and X _n - the coordinates of the end and the beginning of sheet metal, respectively;

Y _l and Y _p - the coordinates, respectively, of the "left" and "right" edges of sheet metal.

When hit on the edge of the sheet on the specified basis, the optoelectronic heads are also changed to the opposite direction of movement.

The number N of sheets 6 that have passed through the measurement zone 2 for a certain time can be set by counting the number of signals corresponding to X _k appearing during measurements.

При этом расстояние от оптоэлектронных головок 4 и 5 до поверхности листа находится в пределах 300-450 мм.Thus, the described device can be used for non-contact optoelectronic control of the geometric parameters of hot sheet metal. In particular, the device implemented by the applicant is used to control the thickness of zirconium sheet blanks with a temperature in the range (350-800) C ° and hafnium with a temperature in the range

The distance from the optoelectronic heads 4 and 5 to the surface of the sheet is in the range of 300-450 mm.

Verification of compliance of the claimed device with the condition (criterion) of patentability "industrial applicability"

According to the applicant, the information given in the description is sufficient to implement the described device. Such a device for controlling sheet metal does not cause difficulties in its manufacture, and the possibility of industrial application of the claimed technical solution is confirmed, for example, by its successful implementation in one of the enterprises of the Urals.

The set of essential features characterizing the essence of the invention, in principle, can be repeatedly used, for example, in rolling production, with the technical result, which consists in providing the ability to control the thickness of sheet metal when the device is in hot production without stopping the process.

The above allows us to conclude that the invention meets the condition of patentability "industrial applicability" under applicable law.

Information sources

1. Devices and systems for automatic control of the dimensions of machine parts. Rabinovich A.N. Kiev: Technics, 1970, p. 220-231.

2. Miracles V.A. et al. Dimensional control in mechanical engineering / V.A. Chudov, F.V. Tsidulko, N.I. Fredheim - M .: Mechanical Engineering, 1982, p.

3. Auth. St. USSR No. 413376 for the invention "Method for measuring the thickness of the strip on rolling mills." BI, 1974, No. 4.

4. Auth. St. USSR №418724 for the invention "Method for controlling the transverse dimensions and profile of the product." IPC G01B 19/34. Publ. 03/05/1974.

5. Zarezankov G.Kh. Photoelectronic devices for automatic control of rental sizes. M .: Metallurgy, 1962, p. 37.

6. Auth. St. USSR No. 113949 for the invention "Photoelectric device for determining the thickness of sheet metal". Publ. 12/09/1958

7. Valkov V.M. Control in the gap. L .: Engineering, 1986, pp. 102-103, Fig. 3.19.

8. Industrial application of lasers / G. Kebner, trans. From English. Edited by I.V. Zuev, M .: Mechanical Engineering, 1998, p. 260-269, Fig. 16.10.

9. RF patent №2256150 for the invention "Device for controlling the thickness of the board" IPC G01B 11/06. Publ. 08/10/2004

10. RF patent No. 2254555 for the invention "Optoelectronic device for monitoring the geometric parameters of the scapula". IPC G01B 11/24, 21/20. Publ. 02/20/2005.

11. USSR copyright certificate No. 1647249. Photovoltaic device for measuring the profile and thickness of products of complex shape. IPC G01B 21/00. Publ. 1991, BI No. 17.

12. RF patent No. 2346236 for the invention "Optoelectronic device for monitoring objects of complex shape." IPC G01B 11/24. Publ. 02/10/2009

13. Autosv.SSSSR No. 1190191 for the invention "Method of photoelectric determination of the thickness of a sheet product and a device for its implementation." IPC G01B 21/02. Publ. 11/07/1985

14. USSR copyright certificate No. 1728647 for the invention “Method for measuring the thickness of sheet products. IPC G01B 11/06. Publ. 04/23/1992.

15. USSR author's certificate No. 1826697 for the invention “Method of non-contact measurement of the thickness of an object. IPC G01B 11/06. Publ. 06/10/1996.

16. USSR author's certificate No. 1826698 for the invention “Method of non-contact thickness measurement. IPC G01B 11/06. Publ. 06/10/1996.

17. RF patent No. 2153647 for the invention "Device for controlling linear dimensions by the principle of triangulation." IPC G01B 11/06. Publ. 07/27/2000

18. RF patent No. 22272712 for the invention "Method of triangulation measurement of the thickness of sheet products and a device for its implementation." IPC G01B 11/03, 11/06. Publ. December 20, 2004 (prototype).

Claims (6)

1. An optoelectronic device for controlling the thickness of sheet metal, containing a massive fixed base with a measurement zone, optoelectronic heads located on opposite sides of the sheet metal, each of the optoelectronic heads formed from a radiation source, a position-sensitive photodetector and a focusing and receiving lenses, and optical the axes of the radiation sources of the optoelectronic heads lie on one straight line, a longitudinal electric drive with rolls that supply sheet metal to the measuring zone a transverse electric drive that provides movement of the optoelectronic heads in the measurement zone in the direction perpendicular to the sheet metal feed direction, and a personal electronic computer (PC), the inputs of which are connected to the outputs of position-sensitive photodetectors of optoelectronic heads, and the outputs are connected to the inputs of longitudinal and transverse electric drives, characterized in that it contains a U-shaped holder, at the opposite ends of which are mounted optoelectronic heads, a carriage, on which a U-shaped holder is fixed, fans built into the body of the optoelectronic heads and equipped with air filters, the base is made in the form of a portal along which the guides for moving the carriage are placed along the horizontal beam and is equipped with parking areas for optoelectronic heads formed by U-shaped protective shields attached to the base in each optoelectronic head use a radiation source with a radiation wavelength of less than 0.63 microns, and each of the optoelectronic heads is equipped with his wife is a light filter placed in front of the receiving lens and tuned to the radiation wavelength range of the radiation source of this optoelectronic head. 2. The device according to claim 1, characterized in that the longitudinal and transverse electric drives are made reversible. 3. The device according to claim 1, characterized in that the ends of the rails are provided with stops that limit the movement of the carriage. 4. The device according to claim 1, characterized in that one of the rolls in front of the measurement zone is equipped with a water cutter mounted above it, made in the form of a metal frame, on the bottom of which a strip of thermo-rubber is fixed along the roll, while the projection of the frame onto the roll surface forms an acute angle with the generatrix of the roll. 5. The device according to claim 1, characterized in that the protective screens of the parking zones for the convenience of maintenance of the optoelectronic heads are equipped with removable panels. 6. The device according to claim 1, characterized in that the fans of the optoelectronic heads are connected to the outputs of the PC.

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