RU2791144C1 - Method for measuring and control of slot gaps of sand filters and inspection machine for its implementation (options) - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to means for automatic control of design parameters, namely to a method and device for measuring and controlling slotted openings of anti-sand filters used in the mining industry. The effect is achieved by using an inspection machine for finishing control and measuring slot gaps of anti-sand filters, including a means for placing a filter, an optical scanner of the filter surface, including a radiation source and a sequentially located lens and a photodetector, as well as means for installing and moving the optical scanner along the filter and connected to them a control unit, including software and hardware, equipped with at least a pre-installed software and hardware image in the memory unit with an algorithm for performing finishing control operations and measuring gap gaps. In this case, the radiation source is made in the form of an industrial illumination and/or a laser-optical unit, and the lens and the photodetector form an optical channel for capturing an image of the scanned section of the filter in the area of illumination by the radiation source and converting it into a digital format. The optical scanner is additionally equipped with a focus control sensor according to the measured data of the current distance of the optical scanner to the scanned filter surface, connected to the control unit, equipped with software and hardware tools for adjusting the position of the optical scanner in height from the scanned surface when the current readings of the control sensor deviate from the specified value of the focal length, and the control unit is equipped with a software-hardware-implemented means of determining the boundaries of the measured slot gap between the turns of the filter, pre-installed in the memory unit, according to a pre-installed software-hardware algorithm for processing the cut-off spectrum of the digital image of the scanned section of the filter obtained from the photodetector through its threshold processing with the removal of spatio-temporal noise.

EFFECT: increasing the accuracy and speed of measurements, while simplifying the design and increasing its reliability.

37 cl, 9 dwg

Description

Purpose and scope

SUBSTANCE: invention relates to means for automatic control of design parameters, namely to a method and device for measuring and controlling slotted openings of anti-sand filters used in the mining industry.

Prior Art

Oil and gas production under typical conditions is carried out by drilling a well to the depth of the field and installing a sequence of connected pipes in the well, through which hydrocarbons are transported or lifted to the surface. In the process of drilling a well, operations of lowering and raising equipment, as well as in the process of extracting oil fluid, fragments of sedimentary rocks are formed, which cause a decrease in the productivity of oil production and cause equipment breakdowns. To combat the phenomenon of sand formation, special filters are used to prevent most of the sand from entering the produced fluid and reduce the effect of sand formation on the efficiency of hydrocarbon recovery. In practice, in most cases, slotted wire filters are used to combat sanding, which have a wire slotted screen formed by coils of winding wire welded to wire guides of the filter (rods). The wire screen is put on a perforated base tube or wound onto it in a straight winding mode. The quality of a wire slotted filter in terms of filtration properties is determined primarily by the distribution of the size of the slotted openings of the filter. According to the distributions of these values, there are strict requirements imposed by oil production operators. Usually these requirements are reduced to conditions for the average values of the gaps and their standard deviations from the average values. In any case, the fulfillment of these requirements is associated with the conditions for the deviation parameters of slotted gaps from the nominal size. In this regard, the task of monitoring and measuring the slot gaps of finished filter products is very relevant and in demand.

A large number of filter slots makes the procedure for checking the gaps of these holes using traditional manual measurement methods using special probes very laborious, inefficient, slow and not accurate enough. Manual insertion of the probe into the gap, including with the help of an optical sight, to measure its width requires a lot of time and is subject to human error. To save time, a relatively small set of sample intervals can be measured and statistical methods applied to determine the average gap width, however, a relatively small sample of slot gaps evaluated as samples may not be sufficient to provide a reliable estimate given the length of the sand screens to be monitored. In addition, due to the small dimensions of the gaps, an enlarged image is usually required with a magnifying lens to measure their width, which is also a source of distortion of the measured data when performing manual measurements. Some of these solutions are disclosed in, for example, US Pat. No. 4,914,514.

Automatic control using special inspection machines can reduce the complexity of gap control and increase its efficiency and accuracy. In addition, automatic control will make it possible to more effectively solve the problem of identifying defective filter winding sections and promptly give recommendations on the winding parameters of wire filters to achieve the required quality of their performance.

From the publication of US patent US7755770B2, a solution is also known which discloses a method for monitoring the surface of an object, in the particular case, a sand filter, including scanning the surface using an array of optoelectronic sensors, obtaining a reflected light signal from a location on the surface, combining light signals to form a representation of the geometric features of the surface and processing the representation to obtain the geometric values of the geometric elements. The filter control device includes an array of a plurality of optoelectronic sensors, a motion control unit and a processor for obtaining the geometric value of the slotted gap of the controlled sand filter based on the image obtained by the sensor matrix and the location registered by the motion control unit. The sensors may include laser sensors or machine vision cameras, or a combination of both. When using a laser sensor, the laser creates a small spot of light on the surface being examined. Surface discontinuity, i.e. the presence of a gap between the wires leads to a dimming of the light spot. Such an event is captured and recorded along with the motion coordinates provided by the motion control unit. Then, with proper calibration, adjacent marks are combined into a digital geometric image. In accordance with some embodiments of the invention, the photodetector in the matrix determines the brightness of the light spot. A brightness map can be generated during scanning and can be used to analyze surface geometry. When using machine vision cameras, the motion control unit moves the object to be inspected or moves the camera or a plurality of cameras to scan a surface and record an image of the surface. Digital pixel processing, combined with appropriate system calibration, is converted into quantitative two-dimensional information. In this case, when the surface under study has a cylindrical shape, scanning is usually performed due to rotational movement around the axis of the cylinder. In accordance with some embodiments of the present invention, scanning may also be performed in successive iterations of linear and/or rotational movements. Among the disadvantages of this solution is the relative instability of the proposed measurement and control method, in view of the fact that the assessment of the brightness of the light spot as such can lead to an erroneous assessment due to the low distinctiveness of its change, which can be caused both by design features and and external factors.

A known method and system for automatic optical control of slotted gaps, described in US patent 7102745 B2 publ. from 05.09.2006. The present invention discloses a method and system for optical inspection of filter slits that uses a digital camera to record the slit as a digital image. The image taken by the digital camera is processed by a computational algorithm to obtain a slot gap value in metric units (microns). The described device uses a system of horizontal movement of the optical scanner along a screw guide along the filter axis with the possibility of filter rotation around its axis. The disadvantage of this device is the lack of a system for moving the scanner in the direction perpendicular to the filter axis. The point is that the filtering surface can be up to 10 meters long, during which significant changes in the distances in the pipe profile from the filter surface to the current position of the scanner are possible. This limitation leads to a complication of the scanner design with the need for automatic focusing of the slit image. This moment can significantly affect the quality of the resulting image and slow down the overall scanning process. In addition, the presence of one horizontal guide for attaching the scanner places high demands on the installation of this guide so that the scanner moves as close as possible to the direction parallel to the filter axis. Certain difficulties arise when using different filter diameters or when using a filter with sleeves with a diameter larger than the filter.

By the combination of essential features, this solution is the closest to the claimed solution, both in terms of the design solution and the method of monitoring and measuring slotted gaps of the sand filter implemented with its help, and can be taken as a prototype. Among the disadvantages of this solution is the relative instability of the proposed method of measurement and control, in view of the fact that evaluation by the image of a digital camera as such can lead to an erroneous assessment due to the low distinctiveness of its change, which can be caused both by design features and and external factors.

The essence of the claimed invention.

The technical problem solved by the claimed group of inventions is to overcome the above problems of solutions known from the prior art and to propose a solution with increased accuracy and stability of measuring and controlling the width of the gaps of anti-sand filters, without significantly complicating the design of the inspection machine and the duration of the process of finishing control and measuring gap gaps sand filters.

The technical result achieved by the claimed solution is to increase the accuracy and speed of measurements, while simplifying the design and increasing its reliability.

The claimed technical result is achieved by using the method of final control and measurement of slot gaps of anti-sand filters, characterized by the performance of sequentially performed actions, including:

- installation of an optical scanner above the filter at a focal length specified by the software and hardware in height from the scanning surface of the filter;

- scanning the filter surface by means of an optical scanner continuously moving along the filter in the horizontal direction with pulsating illumination of the scanned filter surface at a speed set by the control unit in the software-hardware way;

- maintaining the position of the optical scanner within the preset focal length during scanning by measuring the height of the optical scanner above the filter with a control sensor and adjusting the position of the optical scanner in height by the software-hardware method when the current position deviates from the specified focal length parameters;

- capture by the photodetector of the optical scanner in digital format of the image of the scanned surface of the filter, including one slit gap with edges made of metal wire of adjacent turns of the filter, repeating the operation when moving the optical scanner along the scanned surface with the parameters specified by the software and hardware;

- determination of the boundaries of the slit gap by processing the black-and-white spectrum of each received image by software and hardware based on the selection of contours between the light and shadow parts of the image by thresholding with the removal of spatio-temporal noise and a simultaneous increase in image detail; and

- calculation for each image in a hardware-software manner of the size of the slit gap along the selected boundaries by determining the area of the slit gap between the boundaries and calculating the average value of the slit gap over the width of the slit in pixels with conversion to metric units, taking into account the scaling factor, which is an indicator of the resolution of the optical system of the optical scanner.

In one of the possible embodiments of the claimed invention, the operations are repeated to determine the width of the slit gap in the first set of locations along the length of the screen at a given angle of the scanner relative to the filter surface. At the same time, in another embodiment, the operations are also repeated to determine the width of the slit gap in the second set of locations along the length of the filter at a given angle of the scanner with respect to the filter surface when the filter is rotated by a given angle with respect to measurements in the first set of locations.

In another embodiment of the claimed invention, thresholding is carried out at least by binarizing the pixels of the original image by a fixed threshold, and removing spatio-temporal noise by successive application of erosion and dilation operators. Moreover, in one of the possible embodiments, the pixel binarization is carried out by intensity and a fixed threshold as follows:

where threshold is the contrast parameter set based on the properties of the digital camera matrix, the backlight intensity and the reflective properties of the edges of the slit gaps.

In one of the possible embodiments of the solution, at the stage of installing the optical scanner at the focal length from the scanned surface, the calculation of the current distance of the optical scanner in height to the filter surface is carried out by means of a laser focus control sensor using an algorithm for averaging data over distances recorded by the laser focus control sensor during scanning the filter surface.

In another embodiment of the invention, the current position of the optical scanner is corrected within a predetermined focal length by moving the scanner in the vertical direction until a predetermined distance to the filter is established.

In another embodiment, the optical scanner is moved along the tested filter by means of a movable carriage.

According to the claimed invention, according to any of the possible embodiments, additionally, statistical processing of measurement data and analysis of the distribution of the slotted gaps of the filter are carried out, with the calculation of the average values of the gaps and standard deviations, carried out in a hardware-software manner according to a preset algorithm, and the construction of the final report on testing the slotted gaps of the filter is formed with applying predefined criteria for the validity of their distribution for the filter.

In another embodiment, according to any of the possible options, the slot gaps are measured along the outer surface of the filter while moving the optical scanner along the filter and rotating the filter along the longitudinal axis, and the filter is rotated by means of a rotation subsystem equipped with a motor, the torque of which is transmitted through a system of contacting rollers subsystem rotation on the filter.

In another embodiment of the invention, the optical scanner is moved by means of the horizontal movement subsystem of the inspection machine, and in another embodiment, the scanner is mounted on a column, and its movement along the filter is carried out on a carriage along guide rails and a gear rack fixed on the horizontal plate of the inspection table due to the rotation of the gear motor of the horizontal movement subsystem of the inspection machine.

In another possible embodiment of the invention, the measurement of filter slot gaps is controlled by the control unit of the inspection machine, equipped with a touch screen and the processor of the control unit of the inspection machine, by means of a software-hardware-implemented algorithm with a graphical interface displayed on the touch screen.

At the same time, in another version, the pulsating illumination of the scanned surface is carried out by supplying the optical scanner with industrial illumination, with the possibility of digitally capturing the image of the slit gap without distorting the color separation.

The claimed technical result is also achieved by using an inspection machine for finishing control and measuring slot gaps of anti-sand filters, including at least a means for placing a filter, an optical filter surface scanner that includes a radiation source and a lens and a photodetector arranged in series, as well as means for installing and moving an optical scanner along the filter and a control unit connected to them, including software and hardware, equipped with at least a pre-installed software and hardware image in the memory block with an algorithm for performing finishing control operations and measuring slot gaps, which differs from the prototype in that the radiation source is made in the form industrial illumination, and the lens and the photodetector form an optical channel for capturing the image of the scanned section of the filter in the illumination area by the radiation source and converting it into digital format, while the optical scanner is additionally equipped with a sensor for controlling the position of the optical scanner from a filter at a focal length connected to a control unit equipped with software and hardware for adjusting the position of the optical scanner in height from the scanned surface when the current readings of the control sensor deviate from the specified value of the focal length, and the control unit is equipped with a pre-installed in the memory unit a software-hardware means for determining the boundaries of the measured slot gap between the turns of the filter according to the pre-installed software-hardware algorithm for processing the cut-off spectrum of the digital image of the scanned section of the filter received from the photodetector by means of its threshold processing with the removal of spatio-temporal noise.

At the same time, in one of the possible embodiments of the claimed solution, the optical scanner can be placed on a vertically movable platform installed on a vertically oriented horizontally movable along the filter, the column of the means for installing and moving the optical scanner, and the control sensor is placed on the platform by means of a fixed bracket. In this case, in another embodiment, the optical scanner can be equipped with a telecentric lens, with the possibility of forming a beam of parallel beams, and the control sensor is made in the form of a laser triangulation sensor and/or a laser rangefinder. Moreover, in another embodiment, the photodetector can be made in the form of a digital matrix camera and equipped with a bi-telecentric lens.

In one of the preferred embodiments of the claimed invention, industrial illumination can be mounted on a telecentric lens and made pulsating with a speed preinstalled in the microcontroller of the control unit, and the photodetector is made with a short shutter speed comparable to the pulsation speed, with the possibility of fixing and recording the scanned image while continuously moving the column along the filter (at 60 frames per second).

In another possible embodiment of the invention, the radiation source can also be additionally equipped with a laser micrometer.

In accordance with any of the possible embodiments, the means for placing the filter can be made in the form of a horizontally oriented surface, equipped with contacting rollers rotating around the horizontal axis holding the filter on the table surface, at least one of which is associated with the rotation subsystem of the tested filter, equipped with a motor. rotation, coupled with the control unit, while along one of the sides of the table there is a subsystem for horizontal movement along the column filter with an optical scanning device, coupled with the control unit.

At the same time, in another embodiment, the horizontal movement subsystem of the column with an optical scanning device can be equipped with two guide rails with a rack, coupled with a horizontal movement motor and a carriage mounted on the column, and the horizontal movement subsystem is additionally equipped with end sensors for limiting the movement of the column, coupled with control device

According to one aspect of the claimed invention, the means for placing the filter can be additionally provided with means for parking the column with an optical scanning device located on one of the end sides and provided with a protective shield.

According to the claimed invention, the control unit of the inspection machine can be associated with a monitor and equipped with controllers for horizontal and vertical movement of the optical scanning device, coupled with the corresponding subsystems for controlling the horizontal and/or vertical movement of the optical scanning device; a filter rotation controller coupled to the corresponding rotation subsystem of the tested filter, inspection machine controls, as well as memory and information processing units, moreover, the memory and information processing units of the control unit controllers are equipped with a pre-installed algorithm for controlling the modes of operation of the optical scanning device, its focusing and processing the cut-off spectrum of the resulting image by thresholding with the removal of spatio-temporal noise.

Wherein. in another version, a pre-installed software-hardware algorithm for processing the cut-off spectrum of the resulting image by thresholding with the removal of spatio-temporal noise of the information processing unit of the control unit is made with the possibility of:

- scanning the surface of the filter, made with the possibility of rotation around the longitudinal axis, using an optical scanner, made with the possibility of movement in the horizontal and/or vertical direction;

- focusing of the optical scanner by means of the focus control sensor according to the current measurements of the distance of the optical system of the scanner of the scanned surface of the slit filter and vertical adjustment of the position of the scanner when the current readings of the focus control sensor deviate from the focal length preset in the control unit;

- capturing in digital format an image of the filter surface, which includes one slit gap with metal wire edges of adjacent turns of the filter;

- determining the boundaries of the gap according to the pre-installed software and hardware algorithm for processing the cut-off spectrum of the resulting image based on the selection of contours between the light and shadow parts of the image by thresholding with the removal of spatio-temporal noise and a simultaneous increase in image detail; and

- calculations according to a pre-installed software and hardware algorithm of the size of the slit gap along the selected boundaries based on determining the area of the slit gap between the boundaries and calculating the average value of the slit gap over the width of the slit in pixels with conversion to metric units, taking into account the scaling factor, which is an indicator of the resolution of the optical system scanner.

The claimed technical result is also achieved by using another version of the Inspection machine for finishing control and measuring slot gaps of anti-sand filters, including at least a means for placing a filter, an optical filter surface scanner, including at least a measurement channel containing a lens and a photodetector arranged in series , as well as means for installing and moving an optical scanner along the filter and a control unit connected to them, including software and hardware, equipped with at least a pre-installed in the memory unit algorithm for performing finishing control operations and measuring slot gaps, which differs from the prototype in that the optical the scanner is made in the form of a laser-optical unit, including an optical source of probing laser radiation, a channel for measuring the obtained reflected image of the scanned surface, as well as an additional focus control sensor based on the measured data of the current th distance of the optical scanner to the scanned filter surface, connected to the information processing unit of the control unit, equipped with software and hardware for focusing the optical scanner on the deviation from the set value of the readings of the focus control sensor, as well as determining the boundaries of the measured gap according to the preset software and hardware algorithm for processing light and shade spectrum of the resulting image by thresholding with the removal of spatio-temporal noise.

According to one of the embodiments of the claimed solution, the source of probing laser radiation can be made in the form of an optical micrometer, and the optical scanning device is placed on a vertically movable platform installed on a vertically oriented horizontally movable along the filter, the column of the means for installing and moving the device scanning, and the current distance focus control sensor is placed on the platform by means of a fixed bracket. Moreover, the micrometer can be equipped with a telecentric lens, with the possibility of forming a beam of parallel rays, and the focus control sensor is made in the form of a laser triangulation sensor and/or a laser rangefinder, and the photodetector is made in the form of a digital matrix camera and is equipped with a bi-telecentric lens.

According to another embodiment, the scanning device can be additionally equipped with an industrial pulsating backlight with a pre-installed firmware image in the microcontroller of the pulsation speed control unit, fixed on a telecentric lens, and the photodetector is made with a short shutter speed comparable to the pulsation speed, with the possibility of fixing and records scanned during continuous movement of the column along the filter (at 60 frames per second).

In accordance with any possible embodiment of the claimed invention, the means for placing the filter can be made in the form of a horizontally oriented table (surface) equipped with contacting rollers rotating around the horizontal axis holding the filter on the table surface, at least one of which is associated with a rotation subsystem of the tested filter, equipped with a rotation motor coupled to the control unit, while along one of the side sides of the table there is a subsystem of horizontal movement along the column filter with an optical scanning device, coupled to the control unit. At the same time, the horizontal movement subsystem of the column with an optical scanning device can be equipped with two guide rails with a gear rack, coupled with a horizontal movement motor and a carriage mounted on the column, and the horizontal movement subsystem can also be additionally equipped with end sensors for limiting the movement of the column, associated with the device management

In another embodiment, the means for placing the filter can also be additionally provided with a column parking means with an optical scanning device located on one of the end sides and provided with a protective shield.

Whereas in yet another embodiment, the control unit of the inspection machine is preferably coupled to a monitor and provided with horizontal and vertical movement controllers of the optical scanner coupled to the respective horizontal and/or vertical movement control subsystems of the optical scanner; a filter rotation controller coupled to the corresponding rotation subsystem of the tested filter, inspection machine controls, as well as memory and information processing units, moreover, the memory and information processing units of the control unit controllers are equipped with a pre-installed algorithm for controlling the modes of operation of the optical scanning device, its focusing and processing the cut-off spectrum of the resulting image by thresholding with the removal of spatio-temporal noise.

In another embodiment, a pre-installed software and hardware algorithm for processing the cut-off spectrum of the resulting image by thresholding with the removal of spatio-temporal noise of the information processing unit of the control unit can be configured to perform:

- scanning the surface of the filter, made with the possibility of rotation around the longitudinal axis, using an optical scanner, while the scanner is made movable in the horizontal and/or vertical direction, and the filter is rotatable around the longitudinal axis;

- focusing of the optical scanner by means of a focus control sensor according to current measurements of the distance of the optical system of the scanner to the surface of the scanned surface of the slit filter and vertical adjustment of the scanner position when the current readings of the focus control sensor deviate from the values of the allowable focal length preset in the control unit;

- capturing in digital format an image of the filter surface, which includes one slit gap with metal wire edges of adjacent turns of the filter;

- determining the boundaries of the gap according to the pre-installed software and hardware algorithm for processing the cut-off spectrum of the resulting image based on the selection of contours between the light and shadow parts of the image by thresholding with the removal of spatio-temporal noise and a simultaneous increase in image detail; and

- calculations according to a pre-installed software and hardware algorithm of the size of the slit gap along the selected boundaries based on determining the area of the slit gap between the boundaries and calculating the average value of the slit gap over the slit width in pixels with conversion to metric units, taking into account the scaling factor, which is an indicator of the resolution of the optical system scanner.

Brief description of the drawings.

The claimed group of inventions is presented on the following illustrative materials:

fig. 1 is a schematic representation of the inspection machine according to the claimed invention, frontal view, along a horizontally placed filter.

Fig. 2 is a schematic representation of the inspection machine according to the claimed invention, rear view, along a horizontally placed filter;

Fig. 3 - schematic representation of the inspection machine according to the claimed invention, end view, across the axis of the tested filter;

Fig. 4 is a schematic representation of an optical scanner according to the claimed invention;

Fig. 5 is a general view of a mobile platform with an optical scanner and a focal length control sensor;

Fig. 5 - schematic representation of the slotted surface of the filter;

Fig. 6 - an example of the operation of erosion and dilation operators: a) the original image; b) template (center - leading element); c) result of dilation; d) result of erosion;

Fig. 7 - an example of the operation of the algorithm for searching for the boundaries of the gap in accordance with the claimed invention: a) input image; b) the result of the algorithm.

Fig. 8 is a diagram of the operation of the inspection machine in the mode of testing filters according to the claimed invention.

It should be noted that the accompanying drawings illustrate only a portion of some of the most preferred embodiments of the invention and should not be construed as limiting its scope, which includes other embodiments.

The feasibility of the invention.

According to the diagrams of Fig. 1-8 of the exemplary embodiment of the claimed solution, the inspection machine consists of a means for placing a filter 2, made in the form of a horizontally oriented surface of the inspection table 1 and movable along the filter column 3 with an optical scanner 4 (scanner) of the filter surface, mounted on a bracket mounted on a movable platform (carriage) placed on a mobile column. According to the exemplary embodiment shown, the column is vertically oriented and, as intended, is a means of mounting and moving the optical scanner, ensuring its movement. both in the horizontal and vertical direction. To realize this possibility, the column 3 and the table 1 are provided with counter elements of the means of movement 5 of the column in the horizontal direction along the filter 2, and the column is additionally equipped with means for moving in the vertical direction (along the column, in the vertical direction) of the optical scanner 4.

To ensure longitudinal movement of the optical scanner along the filter, according to the claimed solution, the inspection machine is equipped with a subsystem for horizontal 10 movement of the column. Subsystem 10 is associated with a control unit that ensures the movement of the column with the scanning parameters specified in the hardware and software way, including the parameters for moving the optical scanner. So, according to the presented example of implementation (Fig. 2 and 3), the subsystem of the horizontal 10 movement of the column is equipped with longitudinally placed on the surface of the inspection table, along one of its lateral sides, guide rails 11, equipped with a gear rack 12, coupled with the motor 13 of the horizontal movement, and associated with them reciprocal means of movement mounted on the column, for example, made in the form of a carriage 14 (Fig. 2, 3). The subsystem of the horizontal 10 movement of the column is connected to the control unit of the inspection machine, with the ability to control the mode of movement of the carriage installed on the column by means of starting the motor 13 upon receipt of a direct command from the operator to start moving the column, and / or the occurrence of a pre-installed event in the software and hardware way, causing the automatic launch of the column movement mode corresponding to the event. For example, capture of a digital image of a slit gap by a photodetector of an optical scanner can be used as such an event. The column with an optical scanner moves on a carriage 14, for example, equipped with four linear ball bearings 24 (Fig. 3), moving along the filter along two guide rails 11 with the help of a rack 12, fixed on the horizontal panel of the inspection table (Fig. 3) due to rotation of the gear 17 of the motor 13 horizontal movement. This arrangement of the carriage 14 allows the column of the optical scanner to easily move along the entire filter being tested. At the same time, the choice of movement using a gear rack ensures not only the accuracy of moving the column along the filter in the mode specified by the program, but also ensures reliable movement of the column, with minimal risks of creating emergency situations.

Since the anti-sand filter has a winding over the entire outer surface, in order to ensure actual scanning and control of the width of the interturn gaps over the entire surface of the filter, it is necessary, in addition to the longitudinal movement of the column with an optical scanner, to provide the possibility of rotating the filter around the longitudinal axis. To solve this problem, according to the claimed invention, the inspection table 1 is equipped with rollers 7 of rotation, placed along the length of the filter in the form of groups or single rollers in contact with the filter. The presence of rotation rollers built into the design of the inspection table allows solving two problems: positioning and holding the filter on the table surface in a given position in the process of measuring the inter-turn gaps of slot filters, as well as turning the filter at a given angle around the longitudinal axis in the process of scanning the filter surface, providing thus, the possibility of scanning the entire outer surface of the filter as part of one or more processes of measuring and monitoring the state of the slotted gaps of the anti-sand filter, by measuring them both in the longitudinal direction and along the contour of the outer surface of the filter, which speeds up the process of final control of the state of the slotted gaps of the anti-sand filter filters and improve their efficiency. To ensure the rotation of the filter, at least one of the rotating rollers 7 is coupled to the rotation subsystem of the tested filter, equipped with a rotation motor 8, coupled to the control unit 9 of the inspection machine (Fig. 1, 2). In the presented exemplary embodiment, the filter rotation subsystem (not shown in the diagrams) implemented in the software and hardware way, based on the initiated commands of the control unit to rotate the filter, starts the rotation motor 8, the torque of which is transmitted through the system of contacting rollers to the filter, causing the latter to rotate to the specified value. corner. The control unit 9 is equipped with software and hardware for tracking, fixing, storing and sequentially changing the angle of rotation of the filter along the longitudinal axis, as well as generating control commands (signals) to initiate the operation of the rotation motor in a given (pre-installed software and hardware or manually in the memory of the microcontroller of the unit control) mode. In this case, the filter rotation angle can be monitored by the control unit by any method known from the prior art, for example, by calculation based on the weight and size characteristics of the filter, as well as the electrical and mechanical characteristics of the rotation motor, or according to the readings of external sensors associated with the filter rotation axis and the control unit of the inspection machine, as well as in any other way applicable in the art.

According to the claimed invention, the design of the inspection machine assumes both sequential movement of the optical scanner along the filter, including at an increased horizontal and vertical speed of movement of the optical scanner in the mode of scanning the scanner between scanning areas, movement in the scanning mode of the filter surface 6, and its discrete movement with stops at points that correspond to anomalous deviations in the size of the slotted gap of the filter. At the same time, each mode of scanning and measuring slotted gaps includes the stages of setting the column carriage to the starting point of scanning and its transfer to the column parking mode, i.e. its movement to the place where the column is in the idle state, upon completion of the specified scanning process. The parking place can be made in any way known from the prior art, for example, as shown in the diagram of FIG. 2 exemplary embodiments of the claimed invention. In this example, the parking place is located along one of the end sides of the inspection table, at the beginning of the path formed by the counter elements of the column moving vehicle in the horizontal direction 5, for example, made in the form of rails. At the same time, as follows from the diagram of Fig. 2 of the exemplary embodiment, the parking lot can be equipped with a parking guard 15 protecting the optical scanner column from undesirable mechanical impacts on the scanner equipment during filter installation operations.

To ensure the safety of the inspection machine and the implementation of the return mode of the column with an optical scanner to the parking place or to the start of scanning, the horizontal movement subsystem, according to the presented embodiment, can be equipped with end sensors preventing the movement of the column outside the inspection table (not shown in the drawings and diagrams). presented), coupled to the control unit. End sensors (not shown in the diagrams) control the movement of the string and, upon reaching the predetermined boundary of the danger zone, initiate and send the corresponding preset signal (command) to the control unit, in accordance with which the control unit, in turn, initiates a control signal (command) to stop the linear moving the column along the rail track and/or moving the column in the opposite direction, for example, to the place of its parking.

The movement of the column, according to the claimed solution, is controlled by software and hardware, in accordance with the movement algorithm pre-installed in the microcontroller or the memory block of the control unit of the inspection machine, where commands to change the movement mode are initiated either by direct choice of the operator, or in automatic mode upon the occurrence of a predetermined event recognized by the control unit. As follows from the schematic representation of FIG. 2, the control unit, for example, its system unit (not shown in the diagrams) of the inspection machine can be interfaced with the inspection car parking panel and provided with a touch screen 16. In this case, all control of the machine is carried out through the graphical interface of the touch screen of the inspection machine control unit. The exemplary embodiment shown in Scheme 2 is one of the possible embodiments of this structural element of the inspection machine, which can be solved in any other way known from the prior art.

Scanning of the surface of the anti-sand filter and photographic fixation of its inter-turn slot gaps is carried out by an optical scanner 4, movably fixed on the column by means of a bracket 28 installed on the mobile platform 21 (carriage). The mobile platform is associated with the means of its movement in the vertical direction of the column body.

According to the claimed solution, the optical scanner 4 is made in the form of an optical unit equipped with a photodetector 20 arranged in series along the optical axis with a lens 19. As a photodetector, for example, digital matrix cameras with CMOS (CMOS) sensors used in machine vision systems, equipped with an interface data transfer (USB 3.0, GigE, Camera Link) with a resolution of at least 5 megapixels, equipped with image optimization algorithms. For example, as such a camera, Basler AG's ace or ace2 series industrial vision digital cameras can be used, including those equipped with a function that implements an image optimization algorithm built into the software and hardware way (for example, the Basler ace series camera: acA2440-75um), which provides Enhance image quality during full-speed shooting with a combination of 5x5 debayerization, color smoothing, noise reduction and sharpening. Using this image processing algorithm during shooting allows you to get higher quality images directly from the camera, without creating additional CPU load. Due to the presence of a data exchange interface, the problem of adjusting the camera image optimization algorithm for solving specific problems can also be solved using the software pre-installed in the control unit of the inspection machine, interfaced with the camera microcontroller via an interface.

The lens sequentially coupled with the camera to ensure the quality of the images obtained (captured) by the camera is selected from the condition of ensuring the high quality of the images obtained (with high resolution), maintained throughout the entire duration of the image capture in the process of scanning the filter surface. Taking into account that photofixation is carried out in the mode of virtually continuous scanning along the filter and over its entire outer surface, the digital camera of the photodetector is preferably equipped with a bi-telecentric lens 19, for example, AZURE-6510TSM. The use of telecentric optics for a photodetector in the design of an optical scanner makes it possible to increase the accuracy of measurements, since telecentric optics project and receive beams moving strictly parallel to the optical axis of the optical system of the scanner, which makes it possible to form a clearer image on the photodetector with a significant reduction in diffraction effects at the boundaries of the gaps formed by the turns filter on its scanned surface and optical distortion caused by the error (nonideality) of the optics.

According to the claimed invention, in one of the preferred embodiments of its implementation, the radiation source 18 is made in the form of an industrial illumination source 23 (illumination) (Fig. 3), fixed along the contour of the photodetector lens. Lighting plays an important role in machine vision systems because, in combination with other components such as a digital camera and a telecentric lens, it provides the highest and most reproducible quality of the captured image. Industrial illumination 23 creates additional contrast in the image of the gap, increasing the clarity of the image and the accuracy of measurements of the controlled characteristics of the gap. At the same time, the use of a high-performance microprocessor and a CMOS sensor in the photodetector, for example, with a frame rate of at least 75 fps, as well as a telecentric lens in combination with a pulsating industrial backlight, provides an increase in the accuracy of scanning and image processing of interturn gaps at a higher speed than known of the prior art digital scanners, maintaining high image quality in the process of continuous movement of the optical scanner along the filter and / or on its surface when the filter is rotated.

In another embodiment, the optical scanner can be made in the form of a laser-optical module, including a radiation source made in the form of an optical source of probing laser radiation, for example, in the form of a laser optical micrometer, which, in possible embodiments of the claimed solution, can be additionally equipped with a telecentric lens, with the possibility of forming a beam of parallel rays to improve the positioning accuracy and clarity of the captured image of the scanned filter surface. In this case, the optical micrometer can be equipped with a pulsating industrial illumination located around the lens, thereby providing the possibility of high-speed scanning with high definition.

Qualitative and accurate measurement of the slit gap is possible when a clear, focused image of the slit is obtained. The limited depth of focus of the telecentric lens of the optical scanner and the change in the profile of the filter surface, which can have complex shaping, with a variable height of the filter along its length, for example, at the locations of the docking sleeves, which leads to the need to correct the position of the optical scanner within the focal length of the photodetector lens to the filter surface with slotted gaps. According to the claimed solution, to ensure accurate focusing, a focal length (focus) control sensor is used, which, for example, can be used as a laser range finder mounted on a movable platform of an optical scanner.

Thus, in any embodiment of the claimed invention, the measurement channel of the optical scanner contains a radiation source in the form of industrial illumination and/or a micrometer with a telecentric lens, a photodetector with a telecentric lens arranged in series, and a laser sensor of the focal length (focus) of the optical scanner to the scanned filter surfaces connected to the information processing unit of the control unit of the inspection machine, equipped with software and hardware for focusing the optical scanner according to the deviation from the preset value of the current readings of the focus control sensor 22 (focal length) of the scanner to the filter surface.

The possibility of adjusting the position of the optical scanner within the range of allowable focal length values pre-installed for the camera scanner used in the design and the telecentric lens associated with it is carried out, as noted above, by moving the bracket with the optical scanner in a vertical plane by moving the mobile platform 21 (carriage) , on which the bracket 28 is installed along the body of the column 3. The movement of the mobile platform along the column in height can be implemented by any method known from the prior art applicable to this kind of device, for example, by means of a vertical movement motor 25 connected to the control unit, and carriage 21, coupled with two guide rails with a gear rack, located along the column in the vertical direction, with the possibility of moving the mobile platform (carriage) along them (Fig. 3). This embodiment of the means for moving the mobile platform 21 in the vertical direction along the column body is only one of the possible options for its implementation. However, with any embodiment of the means of moving the mobile platform 21, its movements are carried out automatically, by means of continuous monitoring by the control unit in the software and hardware way of the current readings of the control sensor 22 of the focal length (control sensor), their comparison with the values preset in the memory of the control unit for current measurements and the model of the optical scanner, and automatic generation of control commands to the motor or other device for controlling the movement of the platform carriage by means of moving the mobile platform in the vertical direction along the column body.

So, for example, in one of the embodiments of the claimed solution, in order to carry out the process of scanning the filter surface and measuring the size of the interturn gaps of the filter, the optical axis of the scanner is preliminarily oriented at an angle of 90 with a camera, preferably at a distance of 65 mm from the scanned surface, which allows for the most accurate focusing of the optics and clarity of the resulting image. In this case, the position of the lens of the optical scanner, namely the telecentric lens of the photodetector, is positioned so that the scanned area falls within the range of depth of field of the lens of the digital camera of the optical scanner with an accuracy of 1.5 mm. To achieve this effect, a laser range finder (laser triangulation sensor) is preferably used as the focus (focal length) control sensor 22 according to the current distance of the scanner to the filter surface, which has the highest accuracy in determining the distance to the measurement surface. The focal length control sensor is placed on a fixed bracket 28 of the mobile platform 21 (Fig. 4, 5), preferably in front of the optical scanner in the direction of the column movement during the scanning process, since the data received by the control unit from the sensor 22 is used to focus the optical scanner, adjusting its height position. When the control unit associated with the optical scanner registers a filter displacement of more than 1.5 mm relative to the sensor 22, the control unit of the inspection machine is registered in a hardware-software manner and based on the algorithm preinstalled in the controller memory unit (not shown in the diagrams), a command to change the distance from the optical scanner to the surface of the filter 6 so that the distance between the optical scanner and the filter remains constant along the length and the outer contour of the filter throughout the scanning and monitoring of the parameters of the interturn slot gaps. Thus, optimal conditions are provided for capturing and photographing the image of each controlled inter-turn slot gap of the filter over its entire surface at a given scanning speed, without loss of photographic quality.

The possibility of adjusting the position of the optical scanner in the vertical plane in automatic mode makes it possible to move the scanning device along the filter with a variable diameter along its length, to control the focusing of telecentric optics during the scanning of the filter surface, and to measure the slit gaps of filters of different diameters with high accuracy, without stop the scanning process.

The frame of the digital image of the slit gap received by the photodetector from the scanner, and the scanner setting allows capturing only one slit in the frame, is then analyzed to highlight the edges of the slit.

On the image of Fig. 6 shows a schematic representation of the slotted surface of the filter, which consists of a sequence of turns of wire 26 and slotted gaps 27 formed between them. approximation for the studied objects of recognized contours of various shapes. The accuracy of measurements with this algorithm is determined mainly by the quality of the image of the contour of the object, since this algorithm works on the basis of highlighting the contours between the light and shadow parts through thresholding. Determining the contour with high accuracy can be difficult, especially using the "standard" backlight. To minimize errors in recognizing the contour of the interturn gap, the claimed solution works on the basis of an intelligent algorithm modified for current tasks using a mathematical model of the human eye. The algorithm brightens the image spectrum and corrects the overall brightness by adapting local brightnesses. Another important feature of the filter slit contour recognition algorithm implemented in software and hardware as part of the claimed inspection machine solution is the ability to remove spatio-temporal noise while increasing image detail.

So at the first stage, the pixels of the original image obtained as a result of scanning, directly by the microcontroller of the scanning unit and / or control unit, are divided into 2 clusters by color intensity (binarization) according to a fixed threshold by means of a preinstalled software algorithm as follows:

Where the threshold parameter is essentially the contrast parameter of the cut-off image, and is selected empirically, by calibrating, based on the features of the matrix of the digital camera of the photodetector, the backlight intensity and the reflectivity of the slit edges of the slit filter gaps. For example, in a particular case of implementation, this parameter can be selected equal to 30, which makes it possible to provide a high level of sensitivity and accuracy in determining the boundaries of the contour of the interturn gap of the filter.

To remove the noise component, at the next stage, a block of two successive erosion and dilation operators is used (in a particular implementation case, for the presented embodiment, the kernel size is 7x7 pixels). An example of the operation of this algorithm is shown in Fig. 8. As a result of such sequential processing, the resulting image is divided into 2 clusters - the slot zone and the wire zone, for example, as shown in the images of FIG. 7, where FIG. 7 a) is the input, received image, and fig. 7 b) - the image obtained as a result of processing. Obviously, this method of processing the image of the scanned surface obtained by the photodetector makes it possible to significantly increase the contrast of the edges (borders) of the contour sections recorded on the images, to correct the local brightness and background. This property is especially useful for flare, re-reflections, or vice versa, insufficient illumination. The algorithm for determining the boundaries of the slit gap provides the ability to set the contrast parameter of the cut-off image, which can be set at the stage of initial calibration of the readings of measurements of the slit gaps.

Upon determining the boundaries of the gap contour, on the basis of the algorithm preinstalled in the software and hardware way, the gap gap is measured. For this purpose, its area between the selected slot boundaries is determined in pixels, and the average slot gap value is calculated over the slot width in pixels, with the subsequent conversion of this value into metric units of microns. The last action is already carried out based on the resolution of the digital matrix camera. For example, in a particular case of the implementation of the claimed solution, the average value of the slit gap along the width of the slit can be determined from the following ratio, determined based on the counted number of "black pixels" to the total number of horizontal pixels:

The coefficient 5.1 was obtained empirically to convert the final result into metric units (micrometers). This coefficient is an indicator of the resolution of the optical system (in the particular case of the considered embodiment, one image pixel corresponds to a square with a side of 5.1 μm)

Thus, the method for measuring and controlling the gap gaps of anti-sand filters according to the claimed invention is carried out as follows.

In the block diagram of Fig. 9 shows the scheme of operation of the inspection machine according to the claimed solution in the mode of automatic testing of filters.

At the first stage, the filter is installed on the inspection table, while the scanner column is in the parking area. Further, in a hardware-software manner, through a preinstalled user interface, information is entered regarding the individual characteristics of the tested filter (filter number, length, diameter, initial offset from the edge of the base pipe, testing program, etc.), which are processed by the control unit in accordance with pre-installed software and hardware algorithm. Based on the specified data and the pre-installed algorithm for their processing, a pre-installed program for testing slotted gaps of anti-sand filters is selected. The slot gap testing programs may differ in the number of filter segments that are measured. It is possible, for example, to single out a standard test program, according to which the values of, for example, 200 slots are calculated in 4 segments spaced along the entire length of the filter with the filter rotated by 90 degrees between the segments. The continuous testing program assumes the mode of testing slotted gaps for the entire length of the filter in one direction. It is possible to implement other options for testing programs that will provide for different scenarios for scanning and rotating the filter over segments of the filter length.

At the next stage, after starting the selected testing program, the column with the optical scanner placed on it is moved to the position of the first slot of the first gap testing segment. The movement of the column is carried out with the raised position of the scanner for the safety of the machine. To do this, move the mobile platform with the scanning device installed on it along the column up vertically.

Upon reaching the first scanning area, the platform with the scanning device is lowered to the scanned filter and the scanning mode is started, in an automatic or manual control format.

In this mode, at the first stage, the optical focusing of the scanner of the slotted surface of the filter is checked. Focusing is carried out by calculating the distance to the filter surface using a laser focus control sensor according to the current distance of the telecentric lens of the optical scanner camera to the scanned surface. According to the tuning parameters of the inspection machine preset in the memory of the microcontroller of the control unit, the focus is determined by the hit of the distance measured by the sensor from the lens of the scanning device to the scanned surface in the interval of sharpness of the distance (focal length) to the filter surface preset in the system. If the distance does not fall within the specified interval, the position of the scanning device is corrected using the system of vertical movement of the optical scanner by lowering and raising the mobile platform with the scanning device installed on it until the specified distance falls within the specified interval. Upon completion of the adjustment of the focus of the scanning device, recorded by the control unit according to the recorded measurement data of the focal length control sensor, the system in automatic mode or upon launch by the operator generates control signals for the column movement subsystems and the optical scanner to start the filter surface scanning mode in the current section and fixes the optical signals received by the camera. scanner, digital image of the slot gap transmitted via switching lines to the data processing unit of the system control unit, where the received image is processed in accordance with pre-installed software and hardware algorithms. Since the laser beam of the sensor of the current distance to the filter surface may fall into the slit gap, the distance that it measures may differ from the actual distance to the filter surface. In this case, a method is used to exclude the sensor readings at the moments when it enters the slotted holes, based on the algorithm of averaged data over distances recorded by the laser sensor during scanning of the filter surface. In this case, it is assumed that the slotted hole is smaller than the step value between the boundaries of two successive slots.

The image obtained in this way is further processed in a hardware-software manner, based on the photodetector pre-installed in the microcontroller and/or the control unit of the inspection machine of the above threshold algorithm for recognizing the edges of the slot gap, and the value of the gap value is calculated. The obtained value is automatically recorded in the log of performed measurements in the application database of the control unit of the inspection machine. Next, a check is made for the last slit of the scanning interval and, if it is not reached, a transition is made to the next slit in the scanning mode. When the column moving along the filter with the installed optical scanning device reaches the last slit of the scanning interval, the reliability of this fact is verified. If the interval is not the last, then the scanner column is moved horizontally to the first slot of the next segment or testing interval.

In the event that the test program involves the rotation of the filter between intervals, perform the necessary rotation of the filter before scanning the first slit of a new interval. The rotation of the filter can be carried out by any method known from the prior art that provides control of rotation through a given angle, for example, by using a control unit associated with the controller and the filter port means with a stepper motor.

As part of testing in accordance with the claimed solution, it is possible to implement the mode of registration of anomalous gaps of slot filters. If this option is included in the testing procedure, then when calculating the size of the gap, its value is additionally checked for an abnormal value. This usually means that the gap value differs from the nominal value by more than a certain amount preset in the system. If an abnormal gap is detected, the machine stops the scanning process, and the operator of the inspection machine checks for the presence of a defective gap. If a defect is confirmed by the operator, the filter testing is interrupted, and the filter is rejected due to the detection of this defect.

The testing process continues until the last slot of the last test segment is registered. After completion of the testing program, the control unit in automatic mode or at the direction of the operator, for example, by selecting the appropriate operation through the control interface of the pre-installed software of the testing process, initializes a statistical analysis of the distribution of the slot gaps of the filter with the calculation of the average values of the gaps and standard deviations. In this case, the statistical analysis of the results of measurements of slotted gaps is carried out taking into account the parameters of permissible deviations of the measurements carried out pre-installed in the memory block of the microcontroller of the control unit. Thus, the obtained measurement results are filtered, with the identification of a certain part of the measurements, which can be classified as defective. These measurements are excluded by software and hardware from the total number of measurements taken. Based on the received data, a test report is generated. This report checks the validity criteria specified by the program for the statistical values of the distribution of slotted gaps. According to the specified check, a conclusion is formed about the suitability or unsuitability of the filter according to the quality of slotted gaps. At the end of the testing procedure, the scanner is lifted vertically and the scanner column is moved to the parking area.

The claimed group of inventions, which characterizes the device of the inspection machine and the method for testing the slot gaps of anti-flow filters based on it, provides high measurement accuracy and simplicity of design due to the possibility of moving the scanning device both in the horizontal and vertical directions, with the ability to control the presence of the scanning device in the scanning process at the focal length from the filter surface, controlled by an additional current distance sensor, and the use of telecentric optics and industrial illumination as part of the design of the optical scanning device makes it possible to use the hardware-software algorithms for recognizing chiaroscuro images of slits declared as part of the testing method with greater accuracy to calculate their size and actually the process of calculating the value of the gap gap. The simplicity of the system for moving and positioning the scanner saves time for the implementation of these actions and, due to positioning accuracy, increases the accuracy of measurements. This design is reliable and durable in its practical application.

Claims (55)

1. A method for final control and measurement of slot gaps of anti-sand filters, characterized by the performance of successively performed actions, including: - installation of an optical scanner above the filter at a focal length specified by the software and hardware in height from the scanning surface of the filter; - scanning the filter surface by means of an optical scanner continuously moving along the filter in the horizontal direction with pulsating illumination of the scanned filter surface at a speed set by the control unit in the software-hardware manner; - maintaining the position of the optical scanner within the preset focal length during scanning by measuring the height of the optical scanner above the filter with a control sensor and adjusting the position of the optical scanner in height by the software-hardware method when the current position deviates from the specified focal length parameters; - capture by the photodetector of the optical scanner in digital format of the image of the scanned surface of the filter, including one slit gap with edges made of metal wire of adjacent turns of the filter, repeating the operation when moving the optical scanner along the scanned surface with the parameters specified by the software and hardware; - determination of the boundaries of the slit gap by processing the black-and-white spectrum of each received image by software and hardware based on the selection of contours between the light and shadow parts of the image by thresholding with the removal of spatio-temporal noise and a simultaneous increase in image detail; and - calculation for each image in a hardware-software manner of the size of the slit gap along the selected boundaries by determining the area of the slit gap between the boundaries and calculating the average value of the slit gap over the width of the slit in pixels with conversion to metric units, taking into account the scaling factor, which is an indicator of the resolution of the optical system of the optical scanner. 2. The method of claim. 1, characterized in that the repetition of operations to determine the width of the slit gap in the first set of locations along the length of the screen at a given angle of the scanner relative to the filter surface. 3. The method according to claim 2, characterized in that the operations are repeated to determine the width of the slit gap in the second set of locations along the length of the filter at a given angle of the scanner with respect to the filter surface when the filter is rotated at a given angle with respect to the measurements in the first set locations. 4. The method according to claim 1, characterized in that thresholding is carried out at least by binarizing the pixels of the original image by a fixed threshold, and removing spatio-temporal noise by sequentially applying erosion and dilation operators. 5. The method according to claim 4, characterized in that the pixel binarization is carried out by intensity and a fixed threshold as follows:

where threshold is the contrast parameter set based on the properties of the digital camera matrix, backlight intensity, and the reflective properties of the slit gap boundaries. 6. The method according to claim 1, characterized in that at the stage of installing the optical scanner at the focal length from the scanned surface, the calculation of the current distance of the optical scanner in height to the filter surface is carried out by means of a laser focus control sensor using an algorithm for averaging data over distances recorded by the laser sensor focus control during scanning of the filter surface. 7. The method according to claim 1, characterized in that the correction of the current position of the optical scanner within the specified focal length is carried out by moving the scanner in the vertical direction until the specified distance to the filter is established. 8. The method according to claim 1, characterized in that the movement of the optical scanner along the tested filter is carried out by means of a movable carriage. 9. The method according to any one of paragraphs. 1-8, characterized in that they additionally carry out statistical processing of measurement data and analysis of the distribution of the slotted gaps of the filter with the calculation of the average values of the gaps and standard deviations, carried out in a hardware-software manner according to a preset algorithm, and form the construction of a final report on testing the slotted gaps of the filter using preset criteria for the validity of their distribution for the filter. 10. The method according to any one of paragraphs. 1-8, characterized in that the slot gaps are measured along the outer surface of the filter when the optical scanner moves along the filter and the filter rotates along the longitudinal axis, and the filter is rotated by means of a rotation subsystem equipped with a motor, the torque of which is transmitted through a system of contacting rollers of the rotation subsystem to the filter. 11. The method according to claim. 1, characterized in that the movement of the optical scanner is carried out by means of a subsystem of the horizontal movement of the inspection machine. 12. The method according to claim 11, characterized in that the scanner is mounted on a column, and its movement along the filter is carried out on a carriage along guide rails and a gear rack fixed on the horizontal plate of the inspection table due to the rotation of the motor gear of the horizontal movement subsystem of the inspection machine. 13. The method according to claim 1, characterized in that the measurement of the slotted gaps of the filter is controlled by the control unit of the inspection machine, equipped with a touch screen and the processor of the control unit of the inspection machine, by means of a software-hardware-implemented algorithm with a graphical interface displayed on the touch screen. 14. The method according to claim. 1, characterized in that the pulsating illumination of the scanned surface is carried out by supplying the optical scanner with industrial illumination, with the possibility of digitally capturing the image of the slit gap without distorting the color separation. 15. Inspection machine for final control and measurement of slot gaps of anti-sand filters, including at least a means for placing a filter, an optical scanner of the filter surface, including a radiation source and sequentially located lens and photodetector, as well as means for installing and moving the optical scanner along the filter and a control unit connected to them, including software and hardware, equipped with at least a pre-installed software and hardware image in the memory unit with an algorithm for performing finishing control operations and measuring slot gaps, characterized in that the radiation source is made in the form of industrial illumination, and the lens and a photodetector form an optical channel for capturing the image of the scanned section of the filter in the area of illumination by the radiation source and converting it into digital format, while the optical scanner is additionally equipped with a focus control sensor based on the measured data of the current distance of the optical of the scanner to the scanned surface of the filter, connected to the control unit, equipped with software and hardware for adjusting the position of the optical scanner in height from the scanned surface when the current readings of the control sensor deviate from the specified value of the focal length, and the control unit is equipped with a pre-installed in the memory unit implemented software and hardware means for determining the boundaries of the measured slot gap between the turns of the filter according to the pre-installed software and hardware algorithm for processing the cut-off spectrum of the digital image of the scanned section of the filter received from the photodetector by means of its threshold processing with the removal of spatio-temporal noise. 16. The inspection machine according to claim 15, characterized in that the optical scanner is placed on a vertically movable platform mounted on a vertically oriented horizontally movable along the filter, the column of the means for installing and moving the optical scanner, and the control sensor is placed on the platform by means of fixed bracket. 17. Inspection machine according to claim 16, characterized in that the optical scanner is equipped with a telecentric lens, with the possibility of forming a beam of parallel rays, and the control sensor is made in the form of a laser triangulation sensor and / or a laser range finder. 18. Inspection machine according to claim 17, characterized in that the photodetector is made in the form of a digital matrix camera and is equipped with a bitelecentric lens. 19. Inspection machine according to claim 15, characterized in that the industrial illumination is fixed on a telecentric lens and is made pulsating with a pre-installed software and hardware image in the microcontroller of the speed control unit, and the photodetector is made with a short shutter speed comparable to the pulsation speed, with the possibility fixing and recording the scanned image with the continuous movement of the column along the filter (at 60 frames per second). 20. Inspection machine according to claim 15, characterized in that the radiation source is additionally equipped with a laser micrometer. 21. Inspection machine according to any one of paragraphs. 15-20, characterized in that the means for placing the filter is made in the form of a horizontally oriented surface, provided with contacting rollers rotating around the horizontal axis, holding the filter on the table surface, at least one of which is associated with the rotation subsystem of the tested filter, equipped with a rotation motor, coupled with the control unit, while along one of the sides of the table there is a subsystem for horizontal movement along the column filter with an optical scanning device, coupled with the control unit. 22. Inspection machine according to claim 20, characterized in that the subsystem of the horizontal movement of the column with an optical scanning device is equipped with two guide rails with a rack, coupled with a horizontal movement motor, and a carriage mounted on the column. 23. Inspection machine according to claim. 21, characterized in that the horizontal movement subsystem is additionally equipped with end sensors for limiting the movement of the column, associated with the control device. 24. The inspection machine according to claim 20, characterized in that the means for placing the filter is additionally provided with a column parking means with an optical scanning device located on one of the end sides and provided with a protective shield. 25. Inspection machine according to claim 15, characterized in that the control unit of the inspection machine is associated with a monitor and is equipped with controllers for horizontal and vertical movement of the optical scanning device, associated with the corresponding subsystems for controlling the horizontal and/or vertical movement of the optical scanning device; a filter rotation controller coupled to the corresponding rotation subsystem of the tested filter, inspection machine controls, as well as memory and information processing units, moreover, the memory and information processing units of the control unit controllers are equipped with a pre-installed software and hardware algorithm for controlling the operating modes of the optical scanning device, its focusing and processing the cut-off spectrum of the resulting image by thresholding with the removal of spatio-temporal noise. 26. The inspection machine according to claim 24, characterized in that the pre-installed software and hardware algorithm for processing the cut-off spectrum of the resulting image by thresholding with the removal of spatio-temporal noise of the information processing unit of the control unit is configured to: - scanning the surface of the filter, made with the possibility of rotation around the longitudinal axis, using an optical scanner, made with the possibility of movement in the horizontal and/or vertical direction; - focusing the optical scanner by means of a focus control sensor based on current measurements of the distance of the optical system of the scanner of the scanned surface of the slit filter and vertical adjustment of the scanner position when the current readings of the focus control sensor deviate from the focal length preset in the control unit; - capturing in digital format an image of the filter surface, including one slit gap with metal wire edges of adjacent turns of the filter; - determining the boundaries of the gap according to the pre-installed software and hardware algorithm for processing the cut-off spectrum of the resulting image based on the selection of contours between the light and shadow parts of the image by thresholding with the removal of spatio-temporal noise and a simultaneous increase in image detail; and - calculations according to a pre-installed software and hardware algorithm of the size of the slit gap along the selected boundaries based on determining the area of the slit gap between the boundaries and calculating the average value of the slit gap over the width of the slit in pixels with conversion to metric units, taking into account the scaling factor, which is an indicator of the resolution of the optical system scanner. 27. Inspection machine for final control and measurement of slot gaps of anti-sand filters, including at least a means for placing a filter, an optical scanner of the filter surface, including at least a measurement channel containing a lens and a photodetector located in series, as well as means for installing and movement of the optical scanner along the filter and a control unit connected to them, including software and hardware, equipped with at least a pre-installed in the memory unit algorithm for performing finishing control operations and measuring slot gaps, characterized in that the optical scanner is made in the form of a laser-optical block, including an optical source of probing laser radiation, a channel for measuring the received reflected image of the scanned surface, as well as an additional focus control sensor based on the measured data of the current distance of the optical scanner to the scanned surface of the filter connected to the block information processing of the control unit, equipped with software and hardware for focusing the optical scanner on the deviation from the set value of the readings of the focus control sensor, as well as determining the boundaries of the measured gap according to the pre-installed software and hardware algorithm for processing the cut-off spectrum of the resulting image by thresholding with the removal of spatio-temporal noise . 28. Inspection machine according to claim. 27, characterized in that the source of the probing laser radiation is made in the form of an optical micrometer, and the optical scanning device is placed on a vertically movable platform mounted on a vertically oriented horizontally movable, along the filter, installation tool column and moving the scanning device, wherein the current distance focus control sensor is placed on the platform by means of a fixed bracket. 29. The inspection machine according to claim 28, characterized in that the micrometer is equipped with a telecentric lens with the possibility of forming a beam of parallel rays, and the focus control sensor is made in the form of a laser triangulation sensor and / or a laser range finder. 30. Inspection machine according to claim 29, characterized in that the photodetector is made in the form of a digital matrix camera and is equipped with a bitelecentric lens. 31. Inspection machine according to claim 27, characterized in that the scanning device is additionally equipped with an industrial pulsating backlight with a pulsation speed pre-installed in the microcontroller of the control unit of the pulsation speed, fixed on a telecentric lens, and the photodetector is made with a short shutter speed comparable to the pulsation speed , with the possibility of fixing and recording the scanned image with the continuous movement of the column along the filter (at 60 frames per second). 32. Inspection machine according to any one of paragraphs. 27-31, characterized in that the means for placing the filter is made in the form of a horizontally oriented table (surface), equipped with contact rollers rotating around the horizontal axis, holding the filter on the table surface, at least one of which is associated with the rotation subsystem of the tested filter, equipped with a rotation motor coupled to the control unit, while along one of the side sides of the table there is a subsystem of horizontal movement along the column filter with an optical scanning device, coupled to the control unit. 33. Inspection machine according to claim 32, characterized in that the subsystem for horizontal movement of the column with an optical scanning device is equipped with two guide rails with a rack, coupled with a horizontal movement motor, and a carriage mounted on the column. 34. The inspection machine according to claim 33, characterized in that the horizontal movement subsystem is additionally equipped with end sensors for limiting the movement of the column, associated with the control device. 35. The inspection machine according to claim 32, characterized in that the means for placing the filter is additionally provided with a column parking means with an optical scanning device located on one of the end sides and provided with a protective shield. 36. Inspection machine according to claim 32, characterized in that the control unit of the inspection machine is associated with a monitor and is equipped with controllers for horizontal and vertical movement of the optical scanning device, associated with the corresponding subsystems for controlling the horizontal and/or vertical movement of the optical scanning device; a filter rotation controller coupled to the corresponding rotation subsystem of the tested filter, inspection machine controls, as well as memory and information processing units, moreover, the memory and information processing units of the control unit controllers are equipped with a pre-installed software and hardware algorithm for controlling the operating modes of the optical scanning device, its focusing and processing the cut-off spectrum of the resulting image by thresholding with the removal of spatio-temporal noise. 37. The inspection machine according to claim 36, characterized in that the pre-installed software and hardware algorithm for processing the cut-off spectrum of the resulting image by thresholding with the removal of spatio-temporal noise of the information processing unit of the control unit is configured to: - scanning the surface of the filter, made with the possibility of rotation around the longitudinal axis, using an optical scanner, while the scanner is made movable in the horizontal and/or vertical direction, and the filter is rotatable around the longitudinal axis; - focusing the optical scanner by means of a focus control sensor according to current measurements of the distance of the optical system of the scanner to the surface of the scanned surface of the slit filter and vertical adjustment of the scanner position when the current readings of the focus control sensor deviate from the values of the allowable focal length preset in the control unit; - capturing in digital format an image of the filter surface, including one slit gap with metal wire edges of adjacent turns of the filter; - determining the boundaries of the gap according to the pre-installed software and hardware algorithm for processing the cut-off spectrum of the resulting image based on the selection of contours between the light and shadow parts of the image by thresholding with the removal of spatio-temporal noise and a simultaneous increase in image detail; and - calculations according to a pre-installed software and hardware algorithm of the size of the slit gap along the selected boundaries based on determining the area of the slit gap between the boundaries and calculating the average value of the slit gap over the width of the slit in pixels with conversion to metric units, taking into account the scaling factor, which is an indicator of the resolution of the optical system scanner.

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