JP2016101559A - Gold line region image processing system and gold line region image processing method in table gravity beneficiator, and table gravity beneficiation system having gold line region image processing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a table gravity beneficiation system for estimating a gold line position precisely from an image obtained by imaging a gold line region on a fluctuation table, thereby to control automatically the position of a division plate precisely according to a gold line position.SOLUTION: On the basis of a light intensity R of a red component, a light intensity G of a green component and a light intensity B of a blue component of one pixel of a color image of a processing object: a coefficient for a light intensity R of a red color component in the color of a mineral adjoining to a bold wire of a detection object is designated by x; a coefficient for a light intensity B of a blue color component is designated by y; and a threshold value for judging the pixel of a gold line is designated by z. By a constant setting part 151, and by a gold line position estimating part 152, the pixel of (x R+(2-x) G)/2-y B>z (z>0) is decided as the pixel of a bold line, and the color image of said processing object is made binarized to extract a cold wire.SELECTED DRAWING: Figure 1

Description

  In the present invention, a table specific gravity separator that obtains a high-concentration gold concentrate that can be refined directly from gold ore containing gangue minerals and sulfide minerals is combined with image processing technology to automate the adjustment of partition plates. The present invention relates to a gold line area image processing apparatus, a gold line area image processing method, and a table specific gravity beneficiation system including a gold line area image processing apparatus.

  Conventionally, the gold ore beneficiation method has been the gold ore being crushed and then finely pulverized to an appropriate particle size, and the resulting ore is suspended in an aqueous cyanide solution and leached to produce gold. Can be separated from gangue minerals and sulfide minerals, and after separating and concentrating gold minerals from gangue minerals and sulfide minerals by specific gravity flotation and flotation, gold can be further separated and concentrated by the bluening method. It is taken.

  In the bluening method used in these methods, if there is a large amount of gold ore or the amount of gold ore is large, it takes time to dissolve all of the gold ore by the bluening method, and the processing capacity of the melting apparatus is reduced. There is a problem that metal collection is insufficient.

  Therefore, table specific gravity beneficiation (also called oscillating thin-flow beneficiation) has been proposed as a method for recovering high-grade gold concentrates, and coarse gold ore or most of gold ore is separated by table specific gravity beneficiation. This makes it possible to improve the efficiency of the gold separation / concentration process by the low-grade gold ore bluening method.

  For table density beneficiation, a swing table such as a Wilfrey table or a James table is used. The rocking table includes a board having a riffle formed along the rocking direction and a rocking mechanism for giving a rocking motion to the board. On the board, gold ore grains are fed along with a water flow flowing in a direction different from the rocking direction of the board. As a result, gold particles with heavy specific gravity advance in a rocking direction along the riffle and are recovered as concentrate, and particles of gangue mineral and sulfide mineral with light specific gravity are transported over the riffle in the water flow direction, It is discharged as tailings. The concentrate and tailings are separated by, for example, a partition plate that can move along a rocking table and collected in each storage tank.

  In this way, by supplying ores having different specific gravity to the rocking table, the concentrate and the gangue mineral or sulfide mineral are separated and recovered.

  By adopting table specific gravity beneficiation, the amount of separated coarse gold or high-grade gold ore is reduced, so the gold can be separated directly or concentrated by small-scale high-concentration bluening. Can be done.

  However, simply using a rocking table does not clearly separate the concentrate and tailings. In addition, the separation status of concentrate and tailing differs depending on the type of ore to be supplied, especially gold ore, depending on the production area and the situation (whether or not other beneficiation has been made in advance). Furthermore, although the table specific gravity beneficiation may be repeated, the boundary position between the concentrate and the tailing will be different for each batch.

  For this reason, the division between concentrate and tailings is determined by the operator's visual inspection for each operation, and the position of the partition plate must be adjusted manually. The fact was that we had to rely on it.

  Therefore, the applicant of the present application combines high-density mineral concentrate with image processing technology and automates the adjustment of the partition plate, so that the high-grade gold concentrate that can be refined directly from gold ore without relying on the operator's experience. Have been proposed first (see, for example, Patent Document 1).

JP 2012-139675 A

  As described above, in table specific gravity beneficiation, a slurry of ore grains is supplied onto the table, water is supplied while the table is swung, and the specific gravity and particle size of the solid content (ore particles) in the slurry are on the table. Due to the difference in the “flowing method”, a flow of high-quality ore is formed, and the flow is separated by collecting only this flow with a partition plate. The high-quality part is called “gold wire”.

  However, the position of the gold wire varies because it is not easy to stably supply the ore to the table gravity separator. When the position change of the gold wire is captured by image processing and the position of the partition plate is controlled in accordance with the gold wire position, in order to control with high accuracy, a clear image of the gold wire region on the swing table can be stably and It is necessary to reliably acquire and be able to accurately estimate the position of the gold line from the acquired image.

  In view of such conventional circumstances, the object of the present invention is to accurately estimate the position of the gold wire from the image obtained by imaging the gold wire region on the swing table, and to set the position of the partition plate to the gold wire position. Another object of the present invention is to provide a gold line area image processing apparatus, a gold line area image processing method, and a table specific gravity beneficiation system provided with a gold line area image processing apparatus in a table specific gravity sorter that can be automatically controlled with high accuracy. .

  Other objects of the present invention and specific advantages obtained by the present invention will become more apparent from the description of embodiments described below.

  Therefore, in the present invention, in a table specific gravity sorter, image analysis is performed on a color image obtained by imaging a gold wire region on a board provided in a rocking table that disperses ore grains fed together with water flow by specific gravity. Depending on the apparatus, based on the light intensity R of the red component, the light intensity G of the green component, and the light intensity B of the blue component of one pixel of the color image to be processed, the color difference (RB) and (GB) are used. The gold line pixel and the gray pixel other than the gold line are discriminated, the color image to be processed is binarized, the gold line is extracted, and the gold line position is estimated.

That is, the present invention comprises a rocking table provided with a plurality of riffles, provided with a board installed so as to be capable of rocking movement in the extending direction of the ruffles, and for dispersing ores supplied with water flow by specific gravity. A gold wire region image processing apparatus for extracting a gold wire from a color image obtained by imaging a gold wire region on the board in a table specific gravity sorter comprising: a red component of one pixel of a color image to be processed Based on the light intensity R, the light intensity G of the green component, and the light intensity B of the blue component, in the color of the mineral adjacent to the gold wire to be detected,
Constant setting means for setting a coefficient for the light intensity R of the red component as x, a coefficient for the light intensity B of the blue component as y, and a threshold for determining a gold line pixel as z;
(X.R + (2-x) .G) /2-y.B> z (z> 0)
And a gold line extracting means for extracting the gold line by binarizing the color image to be processed.

The gold line area image processing apparatus according to the present invention sets, for example, x = 1 and y = 1 by the constant setting unit, and the gold line extraction unit
(R + G) / 2-B> z (z> 0)
Can be determined as a gold line pixel.

Further, the present invention is a table specific gravity sorting system, comprising a plurality of ruffles, and provided with a board installed so as to be capable of swinging in the extending direction of the ruffles, and supplied with a water stream. A gold line area image processing method for extracting a gold wire from a color image obtained by imaging a gold line area on the board in a table specific gravity sorter having a rocking table that disperses the material according to specific gravity, wherein the color to be processed Based on the light intensity R of the red component, the light intensity G of the green component, and the light intensity B of the blue component of one pixel of the image, in the color of the mineral adjacent to the gold wire to be detected,
The coefficient for the light intensity R of the red component is set as x, the coefficient for the light intensity B of the blue component is set as y, and the threshold for determining the gold line pixel is set as z,
(X.R + (2-x) .G) /2-y.B> z (z> 0)
The pixel is determined as a pixel of a gold line, and the color image is binarized to extract a gold line.

The gold wire region image processing method according to the present invention sets x = 1 and y = 1,
(R + G) / 2-B> z (z> 0)
Can be determined as a gold line pixel.

Further, the present invention is a table specific gravity sorting system, comprising a plurality of ruffles, and provided with a board installed so as to be capable of swinging in the extending direction of the ruffles, and supplied with a water stream. A rocking table that disperses the dispersed ore by specific gravity, a partition plate that is disposed along an edge of the board of the rocking table, and that separates and discharges the dispersed mineral particles into different storage tanks, and A table gravity separator with a partition plate driving device for moving the arrangement position, a color imaging device that is installed above the panel provided in the swing table and images a gold wire region on the panel; An image analysis device that estimates a gold wire position by analyzing a color image of the gold wire region obtained by the color imaging device, and the partition plate drive according to the estimation result of the gold wire position by the image analysis device And a control device for controlling the driving of the device, wherein the image analysis device has a light intensity R of the red component of one pixel of the color image to be processed with respect to the color image of the gold line region obtained by the color imaging device. Based on the light intensity G of the green component and the light intensity B of the blue component, in the color of the mineral adjacent to the gold wire to be detected,
The coefficient for the light intensity R of the red component is set as x, the coefficient for the light intensity B of the blue component is set as y, and the threshold for determining the gold line pixel is set as z,
(X.R + (2-x) .G) /2-y.B> z (z> 0)
Is determined as a pixel of a gold line, the color image to be processed is binarized, a gold line is extracted, and a gold line position is estimated.
In the table specific gravity sorting system according to the present invention, the image analysis device sets, for example, x = 1, y = 1,
(R + G) / 2-B> z (z> 0)
Can be determined as a gold line pixel.

  In the present invention, in a table specific gravity sorting system, a color image obtained by imaging a gold wire region on a board provided in a rocking table that disperses ores fed together with a water flow by specific gravity is obtained by an image analysis device. Based on the light intensity R of the red component, the light intensity G of the green component, and the light intensity B of the blue component of one pixel of the color image to be processed, the color difference (RB) and (GB) are used to calculate gold Distinguish the line pixels and the gray pixels other than the gold line, binarize the color image to be processed, extract the gold line, estimate the gold line position, and set the position of the partition plate to the gold line position In addition, it can be automatically controlled with high accuracy.

It is a conceptual diagram which shows roughly the structure of the table specific gravity sorting system to which this invention is applied. It is a schematic diagram which shows the structural example of the detector which detects the rocking | fluctuation timing of the rocking | fluctuation table of a table specific gravity sorter. It is a timing chart which shows control operation of an imaging device and a light-emitting device by a control device with which a table specific gravity sorter is equipped. It is a schematic diagram which shows the concentrate zone and tailing zone from which the ore grain supplied to the board | substrate of the rocking | fluctuation table was isolate | separated by specific gravity and magnitude | size in the table specific gravity sorter. It is the image figure converted into the binarization process data which shows the said concentrate zone. It is a flowchart which shows the procedure of the automatic operation | movement of the said table specific gravity sorter by the imaging device with which the table specific gravity sorter was equipped, the detector, the control apparatus, and the image analysis apparatus. It is a figure which shows typically the centerline of the gold wire determined by the least square method from the image of a gold wire area | region by the said image analysis apparatus in this table specific gravity separation system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The present invention is applied to, for example, a table specific gravity beneficiation system 300 configured as shown in a conceptual diagram in FIG.

  The table specific gravity sorting system 300 includes a table specific gravity sorter 100 having a rocking table 3 that disperses ores supplied on a board 2 provided with a plurality of riffles 1 by specific gravity, and the rocking table 3. A control device 140 for controlling the drive of the partition plate driving device 10 for moving the arrangement position of the partition plate 4 for separating and discharging the dispersed ore grains of the board 2 into different storage tanks is provided.

  The basic structure of the table specific gravity separator 100 in the table specific gravity sorting system 300 is the same as that of a conventionally known table specific gravity sorter, and a plurality of raffles 1 are provided, and the ruffle 1 is swung in the extending direction. A rocking table 3 that disperses the mineral grains fed together with the water flow by specific gravity on the upper surface 2a of the board 2 that is inclined so as to be able to move and is arranged along the edge of the board 2 of the rocking table 3 And a partition plate 4 for separating and discharging the dispersed ore grains into different storage tanks, and a partition plate driving device 10 for moving the arrangement position of the partition plate 4.

  As the oscillating table 3, any of oscillating tables known as a Wilfrey table and a James table can be applied. The swing table 3 is provided with a board 2 provided with a plurality of riffles 1 in any type. The board 2 is usually placed on a support base via a means such as a rail, and can be oscillated by the oscillating mechanism 20.

  In this table specific gravity separator 100, for example, a rotary drive device 21 using an electric motor and a swing mechanism 20 using a crank / cam mechanism 22 are used to move the swing table 3 slowly around the swing table 3 at a frequency of about several hundred times per minute. The return path is swung by reciprocating quickly.

  Further, the board 2 of the swing table 3 is basically arranged with an inclination of about 0 ° to 10 ° so as to incline from the supply side to the tailing discharge side. The table specific gravity separator 100 is configured such that the inclination angle of the panel 2 is adjusted within an angle range of 0.5 ° to 9 °. A panel drive device (not shown) for adjusting the inclination angle of the panel 2 is provided below. As this panel drive device, an existing drive mechanism such as an actuator that can raise and lower the feed side of the panel 2 of the swing table 3 within a predetermined range can be used.

  In the table specific gravity separator 100, the partition plate 4 is arranged and erected in the concentrate recovery storage tank 5, and is horizontally moved together with the concentrate recovery storage tank 5 by the partition plate driving device 10. . Further, the partition plate 4 is made of polyvinyl chloride, a metal such as aluminum or stainless steel, or a brush arranged thinly in a plate shape, and the tip shape of the partition plate 4 contacting the board 2 of the swing table 3 has an acute angle. Yes. By using such a material and shape, the partition plate 4 can be smoothly moved on the rocking table 3 when separating the concentrate and the tailings.

  Further, in this table specific gravity separator 100, the partition plate driving device 10 for driving the partition plate 4 has a predetermined range along the concentrate side edge of the panel 2 with the partition plate 4 together with the concentrate recovery storage tank 5. For example, an existing drive mechanism including a stepping motor 11 and a ball screw 12 can be used. This partition plate driving device 10 is provided with an origin sensor 10A composed of, for example, a limit switch that is turned on at the origin position of the movement range of the partition plate 4 that is horizontally moved along the concentrate side edge of the panel 2. ing.

  In this table specific gravity separator 100, the rocking table 3 provided with a panel 2 provided with a plurality of ruffles 1 is rocked in the rocking table 3 while being swung in the extending direction of the ruffle 1 by the rocking drive mechanism 20. The ore slurry produced by adding water to the ore crushed ore from the width direction of the rocking table 3 is supplied by the dredge 6, and the width direction of the rocking table 3 is indicated by the water supply dredge 7 as indicated by an arrow A. Supply additional water from.

  Then, of the ore slurry supplied to the rocking table 3, low specific gravity ores such as gangue minerals and sulfide minerals have a small specific gravity from the water tank 7 regardless of the rocking motion of the rocking table 3. Over the riffle 1 with the added water, as shown by arrows B1, B2 and B3, it flows down to the front side surface 3A side of the swing table 3, and is recovered in the first tailings recovery storage tank 8 as tailings.

  On the other hand, the high specific gravity ore with a large specific gravity moves along the riffle 1 along the extending direction of the riffle 1 along with the swinging motion of the swinging table 3, and from the region where the ruffle 1 is disposed. It flows out to the flat part 40 where the ruffle 1 is not arranged. Even if the mineral grains have the same specific gravity, those having a larger particle size tend to move in the water flow direction of the added water, that is, the width direction of the rocking table 3 by the added water from the feed tank 7 than those having a smaller particle diameter. Is strong. Therefore, a high-specific gravity small-particle-size gold-grade flow 41 and a high-specific gravity large-grain-size flow 42 are formed in the flat portion 40. Then, the partition plate 4 separates the high-specific gravity small-particle-size gold-grade flow 41 and the high-specific gravity large-grain-size ore flow 42 into a high-specific gravity small-grain-size gold grade. The high ore is recovered as concentrate in the concentrate recovery storage tank 5, and the high specific gravity and large particle diameter is recovered as tailing in the second tail recovery tank 9.

  That is, by swinging the swinging table 3 by slowly swinging the swinging table 3 by the reciprocating motion in the forward path and the returning path quickly by the swinging mechanism 20, those having a lighter specific gravity gradually move over the riffle 1 due to inertia, Move along Riffle 1 without getting over Raffle 1.

  The part of the flow of high-quality ore is called gold wire.

  The table specific gravity sorting system 300 includes, for example, a color area camera for imaging a gold wire region on the board 2 above the board 2 provided in the swing table 3 of the table specific gravity separator 100. An imaging device 110 and an illumination device 120 including an LED light emitting device for illuminating the gold wire region on the panel 2 are installed.

  Further, the table specific gravity sorting system 300 includes a detector 130 that detects the swing timing of the swing table 3, and the control device 140 controls the imaging device 110 and the illumination device based on the detection output from the detector 130. The operation of 120 is controlled.

  Based on the detection output from the detector 130, the control device 140 oscillates by reciprocating slowly in the forward path and quickly in the return path by the swing mechanism 20 using the rotary drive device 21 and the crank / cam mechanism 22. The imaging device 110 and the illumination device 120 operate so that the gold wire region on the board 2 of the swing table 3 is imaged at a timing near the stop position where the swing speed of the swing table 3 is the slowest. To control.

  Here, for example, as shown in FIG. 2, the detector 130 transmits light to the light reflecting plate 131 provided in the crank cam mechanism 22 for swinging the swing table 3 and the light reflecting plate 131. Irradiating and detecting the light reflected by the light reflecting plate 131, the vicinity of the stop position where the swinging speed of the swinging table 3 swung by the crank / cam mechanism 22 is the slowest. A predetermined timing before the timing is detected by the photodetector 132.

  The control device 140 is composed of, for example, a microcomputer, and starts the timer 1 at the rising timing of the detection output by the photodetector 132 as shown in the timing chart of FIG. 3 (FIG. 3A, FIG. 3 (B)), after the predetermined time (T1) set in the timer 1 has elapsed, the imaging device 110 is operated for a predetermined time (T4) (for example, 100 ms) (FIG. 3C), and the illumination device 120 Is activated (see FIG. 3D), and after the predetermined time (T2) set in the timer 2 has elapsed, the illumination device 120 is shortened during the imaging operation period of the imaging device 110. Control is performed for time emission (FIG. 3E). The illumination device 120 functions as a so-called strobe light emitting device. Since there is a slight time delay from when the imaging operation instruction signal shown in FIG. 3C is output until the actual imaging by the imaging apparatus 110 is started, the illumination apparatus 120 is set to a predetermined time (T2) from the imaging operation instruction signal. Lights up with a delay. In order to adjust the amount of exposure light so that the brightness of the captured image is appropriate, the light emission time (T3) of the illumination device 120 is adjusted.

  Here, in the timer 1, a time (T1) from the rising timing of the detection output by the photodetector 132 to the timing in the vicinity of the stop position where the swing speed of the swing table 3 is the slowest is set in advance. Is done. That is, the gold wire region on the swing table 3 in consideration of the exposure period of the imaging device 110 determined by the time (T2) set in the timer 2 and the brightness and light emission time (T3) of the illumination device 120. A time (T1) to the timing in the vicinity of the stop position that is within the range of the moving speed or less where the clear image can be acquired stably and reliably is preset in the timer 1.

  In this manner, the control device 140 is installed above the panel 2 provided on the swing table 3 based on the detection output of the detector 130 that detects the swing timing of the swing table 3. By controlling the operation of the imaging device 110, the gold wire region on the panel 2 of the swing table 3 is imaged at a timing near the stop position where the swing speed of the swing table 3 is the slowest. A clear image with less blur can be obtained. Furthermore, by causing the illumination device 120 to emit light for a short time during the imaging operation period of the imaging device 110, a clear image of the gold wire region can be stably and reliably acquired.

  That is, in the table specific gravity sorting system 300, the imaging device 110, the detector 130, and the control device 140 provided in the table specific gravity sorter 100 detect the swing timing of the swing table 3 by the detector 130. Then, based on the detection output from the detector 130, the control device 140 controls the operation of the imaging device 110 installed above the panel 2 provided in the swing table 3, so that the swing is performed. The gold wire region imaging device 200 is configured to image the gold wire region on the board 2 of the swing table 3 with the imaging device 110 at a timing near the stop position where the swing speed of the table 3 is the slowest. . Further, the table specific gravity sorter 100 is provided with an image analysis device 150 that analyzes an image of the gold wire region obtained by the imaging device 110 and estimates a gold wire position.

  And the said control apparatus 140 controls the drive of the said partition plate drive device 10 according to the estimation result of the said gold wire position by this image analysis apparatus 150. FIG.

  As the image analysis device 150, in addition to a combination of hardware such as an existing server or personal computer and software for binarized image processing, a dedicated binarized image processing device or the like can be used. The image analysis device 150 binarizes the input image data, and obtains black and white (0 or 1) binary image data based on the situation on the board. The binary image data can be displayed through the monitor unit 150A of the image analysis apparatus 150 or an external monitor.

  Here, the color image of the gold wire region obtained by the imaging device 110 composed of the color area camera is usually at a high specific gravity formed on the flat portion 40 of the board 2 as the swing table 3 swings. The portion of the fine grain flow 41 with a small particle size, that is, a gold wire region containing a large amount of gold grains, is gold (chromatic), whereas the flow of the fine grain flow 42 with a high specific gravity and a large grain size. A portion, that is, a region collected as concentrate or a region where the upper surface 2a of the other board 2 is exposed has a strong tendency to be gray (achromatic color). That is, the light intensity R of the red component, the light intensity G of the green component, and the light intensity B of the blue component in the color image of the gold line region obtained by the imaging device 110 including the color area camera are as follows: In the pixel, the light intensity B of the blue component is lower than the light intensity R of the red component and the light intensity G of the green component, but in the gray pixel other than the gold wire, the light intensity R of the red component and the light intensity G of the green component. The light intensity B of the blue component is almost equal to each other.

  In table specific gravity beneficiation, the thing located next to gold has a specific gravity close to that of gold. In many cases, it is arsenite and the color of arsenite is gray. Pyrite is golden and may produce more, but its specific gravity is smaller than that of arsenite, so pyrite is not located next to gold. Thus, next to the gold wire is a gray arsenite line.

  Therefore, in the table specific gravity sorting system 300, the image analysis device 150 uses the color difference (RB) and (GB) for the color image of the gold wire region obtained by the imaging device 110 including the color area camera. Based on the above, the pixel of the gold line and the gray pixel other than the gold line are discriminated, the color image to be processed is binarized, the gold line is extracted, and the gold line position is estimated.

In this table specific gravity separation system 300, the image analysis device 150 is based on the light intensity R of the red component, the light intensity G of the green component, and the light intensity B of the blue component of one pixel of the color image to be processed. In the color of the mineral adjacent to the gold wire,
A constant setting unit 151 that sets a coefficient for the light intensity R of the red component as x, a coefficient for the light intensity B of the blue component as y, and a threshold for determining a pixel of the gold wire as z,
(X.R + (2-x) .G) /2-y.B> z (z> 0)
A gold line position estimating unit 152 that determines the pixel to be a gold line pixel, binarizes the color image to be processed, extracts the gold line, and estimates the gold line position. Here, a value corresponding to the brightness of the captured image is set as the threshold value z for determining the pixel of the gold line.

The image analysis apparatus 150 is provided with a plurality of ruffles, and includes a board installed so as to be capable of swinging in the extending direction of the ruffles, and swinging that disperses ores supplied with the water flow by specific gravity. It functions as a gold wire area image processing device that extracts a gold wire from a color image obtained by picking up an image of a gold wire region on the board in a table specific gravity sorter equipped with a table, and is obtained by the imaging device 110 including the color area camera. For the color image of the gold line area to be generated, when the minimum brightness value of each of R, G and B is set to 0 and the maximum brightness value is 255 by the constant setting unit 151, x = 1 and y = 1. , Z = 40, and the gold wire position estimation unit 152
(R + G) / 2−B> 40
Is determined as a pixel of a gold line, the color image to be processed is binarized, a gold line is extracted, and a gold line position is estimated.

Thus, when the minimum luminance value of each of R, G, and B is 0 and the maximum luminance value is 255, the above x = 1, y = 1, z = 40 are set,
(R + G) / 2−B> 40
By determining the pixel to be a gold line pixel, it is possible to reliably identify the detection target gold line pixel and the adjacent mineral (arsenite) line pixel. Note that the z value needs to be adjusted according to the brightness of the captured image.

That is, this table specific gravity sorting system 300 is provided with a plurality of ruffles, and is provided with a board installed so as to be capable of swinging in the extending direction of the ruffles, and disperses the ore grains fed together with the water flow by specific gravity. A swing table to be moved, a partition plate arranged along the edge of the table of the swing table, the partition plate for separating and discharging the dispersed ore into different storage tanks, and the position of the partition plate being moved A table gravity separator with a partition plate driving device, a color imaging device that is installed above the panel provided on the swing table and images a gold wire region on the panel, and the color imaging apparatus An image analysis device that estimates a gold wire position by analyzing a color image of the gold wire region obtained by the method, and the partition plate driving device according to the estimation result of the gold wire position by the image analysis device A control device that controls driving, and the image analysis device has a light intensity R, green color of a red component of one pixel of the color image to be processed with respect to the color image of the gold line region obtained by the color imaging device. Based on the light intensity G of the component and the light intensity B of the blue component, in the color of the mineral adjacent to the gold wire to be detected,
The coefficient for the light intensity R of the red component is set as x, the coefficient for the light intensity B of the blue component is set as y, and the threshold for determining the gold line pixel is set as z,
(X.R + (2-x) .G) /2-y.B> z (z> 0)
Is determined as a pixel of a gold line, the color image to be processed is binarized, a gold line is extracted, and a gold line position is estimated.

  The threshold value for binarization is appropriately set or selected in advance in accordance with the type of ore to be beneficiated, the content of high specific gravity ore in the concentrate (concentrate recovery). Usually, in the existing beneficiation, it is preferable to adjust so that this threshold is set at the boundary between the range of concentrate and the range of single blade. Further, it is preferable that a test is performed before the operation is started so that the threshold value can be appropriately adjusted by the image analysis apparatus 150 for each operation.

  Here, in the table specific gravity sorter 100, for example, as shown in FIG. 4, when the mineral is fed to the board 2 of the swing table 3, the ore grains are separated according to the specific gravity and size, and the swing table 3 On the board 2, the concentrate zone where only concentrate is present, or concentrate mainly exists, and tailings zone where only tailings are present, or where tailings are mainly present, are mixed with both edges. Generally separated into zones. Usually, in the beneficiation, the boundary line between the concentrate zone and the single-edged zone extends toward the corner of the board 2 where the concentrate side edge and the tailings side edge of the board 2 intersect, that is, The operating conditions of the specific gravity sorter 100 are set in advance so that the concentrate drops off from the concentrate side edge, and the tailings (including a single blade) drop off from the tail side edge. In FIG. 4, ● represents a high specific gravity grain, ○ represents a low specific gravity grain, and the size of a circle represents the size of the grain.

  Therefore, when the above threshold is set between the brightness of the concentrate zone and the single-edged zone, only the concentrate zone is processed as the numerical value 1, and the other portions are processed as the numerical value 0. For example, when this is expressed in black and white Thus, data as shown in FIG. 5 is obtained. The image analysis device 150 recognizes that there is a boundary between the concentrate zone and the single-edged zone, and outputs position information data as binarization processing data.

  Here, in the table specific gravity sorter 100, a marker 4A is provided, for example, on the top of the partition plate 7, and the marker 4A is combined with the gold wire region on the board 2 of the swing table 3 by the imaging device 110. Image.

  The control device 140 is electrically connected to the partition plate drive device 10 and controls the drive of the partition plate drive device 11 based on the position information data output from the image analysis device 150. Then, along the concentrate side edge of the board 2 such that the position of the gold wire region obtained by analyzing the image by the imaging device 110 by the image analysis device 150 and the position of the marker 4A coincide with each other, The partition plate 7 is automatically horizontally moved within a predetermined range. Since the control is performed at the relative position between the gold wire region and the marker 4A, it is not necessary to strictly adjust the position of the imaging device 110 with respect to the swing table 3. Further, even if the imaging device 110 moves during operation and the position of the gold wire region in the image changes, the control is not affected. On the other hand, even if the marker 4A is not provided, control for recognizing the marker 4A and control for calculating the relative position become unnecessary if the position of the imaging device 110 with respect to the swing table 3 and the imaging magnification are strictly adjusted.

  That is, in the table specific gravity sorting system 300, the imaging device 110, the detector 130, and the control device 140 provided in the table specific gravity separator 100 detect the swing timing of the swing table 3 by the detector 130. Based on the detection output from the detector 130, the control device 140 controls the operation of the imaging device 110 installed above the panel 2 provided in the swing table 3, and the swing table. The gold wire area on the board 2 of the rocking table 3 is imaged by the imaging device 110 at a timing near the stop position where the swing speed of 3 is the slowest, and the gold wire area obtained by the imaging device 110 The image analysis apparatus 150 analyzes the image to estimate the gold wire position, and the image analysis apparatus 150 estimates the gold wire position. In response, the drive of the partition plate driving unit 10 is controlled by the control unit 140.

  In the table specific gravity sorting system 300, the control device 140 is connected to the lighting device 120 and the image analysis device 150 via a hub (HUB) via a LAN (Local Area Network).

  The image analysis apparatus 150 is connected to the Web server 160, and can set various information such as parameters necessary for analysis processing as data set from the database in the Web server 160. Yes.

  Here, the imaging device 110, the detector 130, the control device 140, and the image analysis device 150 perform automatic operation of the table specific gravity separator 100 according to the procedure shown in the flowchart of FIG.

  That is, when automatic operation is started, the control device 140 first performs an origin return process (step S1). That is, the control device 140 horizontally moves the partition plate 4 along the concentrate side edge of the panel 2 by the partition plate driving device 10 and is turned on at the origin position of the movement range of the partition plate 4. The origin return process is performed by stopping the partition plate 4 at a position where an ON signal is obtained from the origin sensor 10A installed in this manner.

  And the said control apparatus 140 is performing the determination process (step S2) which determines whether the detection output by the said detector 130 was obtained, The determination result is "Yes", ie, the detection output by the said detector 130 Is obtained, an imaging command is sent to the imaging device 110 and the illumination device 120 (step S3), the illumination device 120 is turned on (step S4), and the imaging device 110 is operated.

  Next, the imaging device 110 captures an image of the gold wire region illuminated by the illumination device 120 in response to an imaging command from the control device 140 (step S5), and the image analysis of the obtained gold wire region image is performed as the image analysis. The data is transferred to the device 150 (step S6).

  Next, the image analysis device 150 receives the image of the gold wire region sent from the imaging device 110 (step S7), and performs a process of analyzing the received image of the gold wire region (steps S8 and S9). ).

  That is, the image analysis device 150 performs a determination process (step S8) for analyzing the image by the imaging device 110 and determining whether the position of the gold wire region and the position of the marker 4A of the partition plate 7 are obtained. If the determination result is “No”, the process returns to the determination process of step S3 for determining whether or not the detection output by the detector 130 is obtained, and the determination result is “Yes”, that is, When the position of the gold wire region and the position of the marker 4A on the partition plate 7 are obtained, the relative distance between the position of the gold wire region and the position of the marker 4A on the partition plate 7 is measured (step S9). Then, partition plate position correction information is generated and transmitted to the control device 140 (step S10).

  The control device 140 receives the partition plate position correction information sent from the image analysis device 150 (step S11), sends a partition plate position command according to the received partition plate position correction information, and drives the partition plate. The driving of the device 11 is controlled (step S12), and the process returns to the determination process of step S3 for determining whether or not the detection output by the detector 130 is obtained.

  In the table specific gravity sorting system 300, the swing timing of the swing table 3 is detected by the detector 130, and based on the detection output by the detector 130, the upper side of the panel 2 provided in the swing table 3 is detected. The control device 140 controls the operation of the imaging device 110 installed on the surface of the rocking table 3 on the panel 2 at a timing near the stop position where the rocking speed of the rocking table 3 is the slowest. The image analysis device 150 captures an image of the gold wire region obtained by the imaging device 110, and the image analysis device 150 captures an image of the gold wire region obtained stably and reliably as a clear image of the gold wire region. Analyzing and estimating the position of the gold wire, and controlling the driving of the partition plate driving device 10 according to the estimation result of the gold wire position by the image analysis device 150 Controlled by location 140, it is possible to perform automatic operation of the table gravity beneficiation machine 100.

  In the table specific gravity separation system 300, the image analysis device 150 includes the gold wire region image obtained by the imaging device 110 in each line of the gold wire region image as shown in FIG. From the gold particle pixel distribution, the center vector of the gold wire is obtained by the least square method, the center line L is determined by a first order approximation, and the width H of the gold wire is estimated from the variance σ.

That is, the center line L (y = ax _i + b), where n is the number of pixels of gold particles distributed in the image range AR to be processed with respect to the image of the gold line region, and the pixel position is (x _i , y _i ) The coefficients a and b that minimize the sum of squares of the difference from y _i are
a = (nΣx _i y _i −Σx _i Σy _i ) / (nΣx _i ² − (Σx _i ) ² )
b = (Σx _i ² Σy _i −Σx _i y _i Σx _i ) / ((nΣx _i ² − (Σx _i ) ² )
The width H of the gold wire is determined by the position obtained by adding an arbitrary offset value to 3σ of the pixel distribution of the gold particles.

  If the upper surface 2a of the board 2 of the swing table 3 is a uniform plane as a whole, the center line L can be obtained with high accuracy by the first order approximation. However, the center line L is covered with a rubber sheet or the like. Under the influence of local irregularities generated in the flat portion 40 of the upper surface 2a of the board 2, a high-specific gravity small-grain-size gold grain flow 41 and a high specific gravity on the flat portion 40 and a high specific gravity are used. If waviness occurs in the large ore flow 42, the center line L having a large error is determined by the first-order approximation.

  Therefore, in the table specific gravity sorting system 300, the image of the gold wire region obtained by the imaging device 110 is displayed through the monitor of the image analysis device 150 or an external monitor, and an operator is generated in the flat portion 40 on the screen. A range designating unit 150B is provided for designating an image range AR to be processed for the image of the gold line region that is not affected by the local unevenness.

  The image analysis device 150 obtains the center vector of the gold wire GL by the least square method within the image range AR to be processed specified by the range specifying unit 150B, and determines the center line L with high accuracy by linear approximation. In addition, the width H of the gold wire GL can be estimated from the variance value σ.

  Then, according to the estimation result of the gold wire position by the image analysis device 150, the control device 140 controls the driving of the partition plate driving device 10, and the image analysis device 150 estimates the gold wire position. Is multiplied by a predetermined ratio to the estimated value of the gold wire width H, and the partition plate 4 is positioned at a position to which a predetermined offset is added.

  In the table specific gravity sorting system 300, the gold wire position is accurately estimated from an image obtained by imaging the gold wire region on the swing table 3, and the position of the partition plate 4 is automatically adjusted with high accuracy by matching the gold wire position. Can be controlled.

  1 ruffle, 2 units, 3 swing tables, 4 partitioning plates, 4A marker, 5 concentrate recovery storage tank, 6 feed tank, 7 feed tank, 8 first tail recovery tank, 9 second tail recovery tank DESCRIPTION OF SYMBOLS 10 Partition drive device, 11 Stepping motor, 12 Ball screw, 20 Oscillating mechanism, 21 Rotation drive device, 22 Crank cam mechanism, 40 Flat part, 100 Table specific gravity sorter, 110 Imaging device, 120 Illumination device, 130 Detector, 131 Light reflector, 132 Photo detector, 140 Control device, 150 Image analysis device, 151 Constant setting unit, 152 Gold wire position estimation unit, 300 Table specific gravity sorting system

Claims (6)

Table gravity separator with a rocking table provided with a plurality of ruffles, and provided with a board installed so as to be capable of rocking motion in the extending direction of the ruffles, and to disperse ores supplied with water flow by specific gravity A gold wire region image processing apparatus for extracting a gold wire from a color image obtained by imaging the gold wire region on the board in
Based on the light intensity R of the red component, the light intensity G of the green component, and the light intensity B of the blue component of one pixel of the color image to be processed, in the color of the mineral adjacent to the gold wire to be detected,
A setting unit that sets a coefficient for the light intensity R of the red component as x, a coefficient for the light intensity B of the blue component as y, and a threshold for determining a pixel of the gold wire as z,
(X.R + (2-x) .G) /2-y.B> z (z> 0)
A gold line region image processing apparatus comprising: a gold line extraction unit that determines a pixel to be a gold line pixel and binarizes the color image to be processed to extract a gold line. The above constant setting unit sets x = 1 and y = 1,
By the gold wire extraction means,
(R + G) / 2-B> z (z> 0)
The gold line region image processing apparatus according to claim 1, wherein the pixel to be determined is a gold line pixel. Table gravity separator with a rocking table provided with a plurality of ruffles, and provided with a board installed so as to be capable of rocking motion in the extending direction of the ruffles, and to disperse ores supplied with water flow by specific gravity A gold wire region image processing method for extracting a gold wire from a color image obtained by imaging the gold wire region on the board in
Based on the light intensity R of the red component, the light intensity G of the green component, and the light intensity B of the blue component of one pixel of the color image to be processed, the light intensity R of the red component in the color of the mineral adjacent to the gold wire to be detected X is a coefficient for y, y is a coefficient for light intensity B of a blue component, and z is a threshold for determining a pixel of a gold wire
Set as
(X.R + (2-x) .G) /2-y.B> z (z> 0)
Is determined to be a gold line pixel,
A gold line region image processing method characterized by binarizing the color image to be processed and extracting a gold line. Set x = 1, y = 1,
(R + G) / 2-B> z (z> 0)
4. The gold line region image processing method according to claim 3, wherein the pixel to be determined is a gold line pixel. A rocking table provided with a plurality of riffles and provided with a board installed so as to be capable of rocking motion in the extending direction of the riffles, and for dispersing the ore grains fed together with the water flow by specific gravity, and the rocking table A table provided with a partition plate arranged along the edge of the panel and separating and discharging the dispersed ore into different storage tanks, and a partition plate driving device for moving the position of the partition plate A specific gravity separator,
A color imaging device that is installed above the board provided in the swing table and images a gold wire region on the board;
An image analysis device that estimates a gold wire position by analyzing a color image of the gold wire region obtained by the color imaging device;
A control device for controlling the driving of the partition plate driving device according to the estimation result of the gold wire position by the image analysis device,
The image analysis device has a red component light intensity R, a green component light intensity G, and a blue component light of one pixel of the color image to be processed with respect to the color image of the gold wire region obtained by the color imaging device. Based on the intensity B, in the mineral color adjacent to the gold wire to be detected, the coefficient for the light intensity R of the red component is x, the coefficient for the light intensity B of the blue component is y, and the threshold for determining the pixel of the gold wire set as z,
(X.R + (2-x) .G) /2-y.B> z (z> 0)
The table specific gravity sorting system is characterized in that the pixel to be determined is a pixel of a gold line, the color image to be processed is binarized, a gold line is extracted, and a gold line position is estimated. The image analysis apparatus sets x = 1 and y = 1,
(R + G) / 2-B> z (z> 0)
6. The table specific gravity separation system according to claim 5, wherein the pixel to be determined is a gold wire pixel.

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