JP2021107651A - Aggregate particle size measurement system and asphalt plant - Google Patents

Abstract

To provide hot bins, an aggregate particle size measurement system, and an asphalt plant capable of performing quality control of an aggregate stored in each hot bin with a small work load.SOLUTION: In an asphalt plant 100 that produces an asphalt mixture containing asphalt and aggregate, a hot bin 10 for storing an aggregate A comprises: a storage bin 11 for storing the aggregate A classified according to its particle size; and a transparent member 16 that closes a window part 15 formed in the storage bin 11. An aggregate particle size measurement system 60 comprises: an imaging device 61 capable of imaging the aggregate A stored in the storage bin 11 through the window part 15; and an arithmetic unit 64 that measures the particle size of the aggregate A based on the image data taken by the imaging device 61.SELECTED DRAWING: Figure 2

Description

The present invention relates to hot bins, aggregate particle size measuring systems and asphalt plants used to produce asphalt mixtures.

In an asphalt plant, the aggregate of the asphalt mixture is stored in a hot bottle prior to the mixing step with the asphalt. The hot bottle has a storage bottle for storing aggregates according to the particle size. Here, in order to ensure the quality of the asphalt mixture, it is necessary to keep the particle size of the aggregate stored in each storage bottle within a predetermined distribution range. However, in reality, the particle size of the aggregate in the storage bottle may vary beyond the permissible range due to the shape of the aggregate, the aging of the screen, and the like. Therefore, conventionally, quality control is performed by collecting a sample sample for each storage bin and having a quality control person perform a sample sieving test in a laboratory to inspect the particle size of the aggregate (for example, patent documents). 1).

Jikkenhei 6-086055

However, when the work of collecting a sampling sample of the aggregate for each storage bottle and then bringing the sampling sample to the laboratory to carry out a sieving test, the work load on the quality control of the aggregate becomes excessive. There is a problem.

An object of the present invention is to provide a hot bin, an aggregate particle size measuring system and an asphalt plant capable of performing quality control of aggregates stored in each hot bin with a small work load.

[1] In order to solve the above problems, the hot bin according to the present invention is a hot bin for storing the aggregate in an asphalt plant for producing an asphalt mixture containing asphalt and an aggregate, and the hot bin has a particle size. It is a hot bin provided with a storage bin for storing the aggregates classified according to the requirements and a transparent member for closing the window portion formed in the storage bin.

[2] In the above invention, the storage bottle has a storage chamber for storing the aggregate and both ends connected to the storage chamber, and communicates with the storage chamber through the both ends and the storage chamber. A bypass path through which at least a part of the aggregate can pass is provided, and the window portion may be provided in the bypass path.

[3] In the above invention, the storage bottle has a discharge port for discharging the aggregate to the outside, and the hot bottle is attached to the storage bottle so as to cover the window portion and the discharge port. A dustproof cover and a storage portion capable of accommodating an imaging device are provided, and at least a part of the storage portion is arranged inside the dustproof cover, and the storage portion is the window inside the dustproof cover. It may have a photographing opening that opens toward the portion.

[4] In the above invention, the storage portion is a tubular member having openings at both ends, one of the storage portions is an opening for photographing, and the other opening of the storage portion. The portion may protrude to the outside of the dustproof cover.

[5] In the above invention, the storage bottle has a discharge port for discharging the aggregate to the outside, and the hot bin includes a dustproof cover attached to the storage bottle so as to cover the discharge port. The window portion may be provided outside the dustproof cover.

[6] In the above invention, the window portion may be provided parallel to the vertical direction or may be provided so as to be inclined toward the inside of the storage bottle.

[7] In the above invention, the storage bottle has a recess that is recessed toward the inside of the storage bottle, and the window portion may be formed in the recess.

[8] The aggregate particle size measuring system according to the present invention is an aggregate particle size measuring system for measuring the particle size of the aggregate stored in the hot bin, and is provided outside the storage bin of the hot bin. At the same time, an image pickup device capable of photographing the aggregate stored in the storage bin through the window portion and a calculation for measuring the particle size distribution of the aggregate based on the image data taken by the image pickup device. It is an aggregate particle size measuring system equipped with an apparatus.

[9] The asphalt plant according to the present invention is an asphalt plant that produces an asphalt mixture containing asphalt and an aggregate, and has a dryer for heating the aggregate and the aggregate heated by the dryer in a particle size. A screen that sifts according to the classification, the hot bin that stores the aggregate sifted by the screen for each classification, and an aggregate measuring tank that measures the aggregate released from each of the plurality of hot bins. It is an asphalt plant provided with a mixer that mixes the aggregate and the asphalt measured by the aggregate measuring tank.

[10] In the above invention, the asphalt plant may be provided with a discharge port of the plurality of storage bottles, the aggregate measuring tank, and a dustproof cover covering the mixer.

[11] In the above invention, the asphalt plant includes an aggregate particle size measuring system for measuring the particle size distribution of the aggregate stored in each of the plurality of hot bins, and the aggregate particle size measuring system is the hot bin. Based on an image pickup device provided outside the storage bin and capable of photographing the aggregate stored in the storage bin through the window portion, and image data taken by the image pickup device, the said A computing device for measuring the particle size of the aggregate may be provided.

[12] In the above invention, the arithmetic unit calculates a correction amount of the amount of the aggregate released from the storage bottle based on the particle size of the aggregate calculated by the arithmetic unit, and the aggregate measuring tank. May change the amount of aggregate released from the plurality of storage bottles based on the amount of correction.

According to the present invention, since the particle size of the aggregate stored in the hot bottle can be confirmed from the outside of the storage bottle of the hot bottle through the window, the bone stored in each storage bottle with a small work load. It is possible to control the quality of materials.

It is a figure which shows the structure of the asphalt plant which concerns on 1st Embodiment of this invention. It is a figure which shows the storage bottle of the hot bottle and the aggregate particle size measurement system which concerns on 1st Embodiment of this invention. FIG. 3A is a diagram showing an example of image processing using the aggregate particle size measurement system shown in FIG. 2, and FIG. 3B is a diagram showing an aggregate in the image processing shown in FIG. 3A. It is a figure which shows the state which segmented the contained aggregate particles. It is a graph which shows an example of the relationship between the volume and the weight of the aggregate obtained by the linear regression analysis. It is a graph which represented the particle size of the aggregate by the passing weight ratio of the aggregate according to the threshold value of the sieve. It is a figure which shows the storage bottle of the hot bottle and the aggregate particle size measurement system which concerns on 2nd Embodiment of this invention. It is a figure which shows the storage bottle of the hot bottle and the aggregate particle size measurement system which concerns on 3rd Embodiment of this invention. It is a figure which shows the storage bottle of the hot bottle and the aggregate particle size measurement system which concerns on 4th Embodiment of this invention. It is a figure which shows another example of the hot bin storage bottle and the aggregate particle size measurement system which concerns on 4th Embodiment of this invention. It is a figure which shows the storage bottle of the hot bottle and the aggregate particle size measurement system which concerns on 5th Embodiment of this invention.

<< First Embodiment >>
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
As shown in FIG. 1, the asphalt plant 100 includes a new aggregate supply system 110, a regenerated aggregate supply system 140, an asphalt supply system 150, an aggregate particle size measurement system 60, and a mixer 5. The mixer 5 is formed with a material input port 5a for charging aggregate, asphalt, and the like. In FIG. 1, the flow of aggregates, asphalt, etc. is shown by a solid line, and the flow of image data, control signals, etc. is shown by a alternate long and short dash line.

The new aggregate supply system 110 includes a dryer 1, a hot elevator 2, a screen 3, a hot bin 10, and an aggregate measuring tank 4. Further, the inside of the hot bin 10 is divided into five compartments, and each compartment constitutes a storage bin 11. Total height of the storage bin is H _0. A window portion 15 is formed in each storage bin 11. Also, each storage bin 11 has a discharge port 13 that is a downward opening. Further, the aggregate measuring tank 4 has an aggregate inlet 4a which is an upward opening facing the discharge port 13 of the storage bottle 11 of the hot bottle 10. Further, the hot bin 10 has a dustproof cover 6. The dustproof cover 6 is provided so as to cover all the discharge ports 13 of the storage bottle 11 of the hot bottle 10, the aggregate measuring tank 4, and the material input port 5a of the mixer 5. The number of storage bottles 11 included in the hot bottle 10 is not particularly limited to the above.

In the new aggregate supply system 110, the new aggregate supplied to the mixer 5 is first heated by the dryer 1. The aggregate heated and dried by the dryer 1 is transported to the screen 3 by the hot elevator 2. The aggregate is screened by the screen 3 according to the particle size. That is, the aggregate is classified by the screen 3 according to the particle size. Each of the aggregates classified by the screen 3 is stored in one of the five storage bins 11 according to the particle size. The aggregate stored in each storage bin 11 is appropriately opened from the discharge port 13 of the storage bottle 11 to the aggregate of the aggregate measuring tank 4 by opening the lid portion 14 attached to the discharge port 13 of the storage bottle 11. It is discharged to the inlet 4a. The aggregate charged into the aggregate measuring tank 4 through the aggregate charging port 4a is cumulatively weighed by a measuring device (not shown) provided in the aggregate measuring tank 4. When the weight of the aggregate put into the aggregate measuring tank 4 reaches the target amount, the hot bin 10 closes the lid portion 14 of each storage bin 11 in response to the instruction from the aggregate measuring tank. Then, the aggregate measured by the aggregate measuring tank 4 is supplied to the mixer 5.

In addition, the regenerated aggregate supply system 140 has a regenerated aggregate supply device 141 and a regenerated aggregate measuring tank 142. Recycled aggregate is used by recycling aggregate contained in waste pavement. The regenerated aggregate supply device 141 includes a dryer for regenerated aggregate (not shown) or the like that heats and dries the regenerated aggregate. The regenerated aggregate measuring tank 142 measures the regenerated aggregate supplied from the regenerated aggregate supply device 141. The regenerated aggregate measured by the regenerated aggregate measuring tank 142 is supplied to the mixer 5.

Further, the asphalt supply system 150 has an asphalt tank 151 and an asphalt measuring tank 152. The asphalt measuring tank 152 measures the asphalt sent from the asphalt tank 151 and supplies it to the mixer 5.

In the mixer 5, the asphalt mixture is produced by mixing the aggregate supplied from the new aggregate supply system 110, the regenerated aggregate supplied from the regenerated aggregate supply system 140, and the asphalt supplied from the asphalt supply system 150. Manufactured.

The aggregate particle size measuring system 60 of the present embodiment is a system for measuring the particle size of a new aggregate stored in the storage bin 11 by using an image processing technique, and is an image pickup device 61, an image processing device 62, and a particle size. It has an analyzer 63. The image processing device 62 and the particle size analysis device 63 constitute an arithmetic unit 64. A computer can be exemplified as a specific example of the arithmetic unit 64.

Although only one image pickup device 61 is shown in FIG. 1 for convenience, the aggregate particle size measurement system 60 has a plurality of image pickup devices 61 provided according to each of the storage bins 11. .. Specifically, when the hot bin 10 has five storage bins 11, the aggregate particle size measuring system 60 has five imaging devices 61 corresponding to each storage bin 11. Further, each imaging device 61 is provided at a position facing the window portion 15 of the storage bin 11 so that the inside of each storage bin 11 can be photographed through the window portion 15.

The image pickup apparatus 61 is a camera that supports monochrome or color. The image pickup apparatus 61 and the image processing apparatus 62 are connected by wire or wirelessly. Specifically, the image pickup device 61 and the image processing device 62 may be electrically connected via a LAN cable or a USB cable, or may be wirelessly connected.

Similarly, the image processing device 62 and the particle size analysis device 63 are connected by wire or wirelessly. The image processing device 62 processes and analyzes the image data acquired by the image pickup device 61, accumulates these image data, and can refer to them after the fact as necessary. The method for measuring the particle size of the aggregate using the aggregate particle size measuring system 60 will be described later.

Next, the configuration of the storage bottle 11 of the hot bottle 10 will be described in detail with reference to FIG.

The storage bottle 11 has a main body portion 11a formed so as to increase in width toward the top, and a tubular gate portion 11b connected to the lower end of the main body portion 11a. The space inside the main body portion 11a and the gate portion 11b constitutes a storage chamber 11c for storing the aggregate A. A discharge port 13 is formed at the lower end of the gate portion 11b. A lid portion 14 is attached to the gate portion 11b. A cylinder (not shown) is attached to the lid portion 14, and the lid portion 14 operates so as to open and close the discharge port 13 of the gate portion 11b in response to the reciprocating motion of the cylinder. The amount of aggregate charged from the storage bottle 11 into the aggregate measuring tank 4 is adjusted by the timing of opening and closing the lid portion 14 of the discharge port 13.

Further, the storage bottle 11 has a bent tubular bypass path 11d. The upper end portion 11e of the bypass path 11d is connected to the main body portion 11a, and the lower end portion 11f of the bypass path 11d is connected to the gate portion 11b. That is, the bypass path 11d communicates with the storage chamber 11c via both end portions (upper end portion 11e and lower end portion 11f). A part of the aggregate A thrown in from above the storage bin 11 can pass through the bypass path 11d. That is, a part of the aggregate A is stored in the bypass path 11d.

A window portion 15 is formed in the bypass path 11d. A transparent member 16 is fitted in the window portion 15. That is, the transparent member 16 closes the window portion 15. The transparent member 16 is a member capable of transmitting visible light, and is formed of, for example, glass, plastic, acrylic, resin, vinyl chloride resin, polystyrene, polycarbonate, polystyrene, hybrid glass, or the like. In this embodiment, the transparent member 16 is made of tempered glass. Further, the transparent member 16 is not limited to this, and may be a material capable of transmitting infrared rays. The transparent member 16 is a rectangular member having a size of 15 cm × 10 cm, but the size of the transparent member 16 is not particularly limited to this.

_{Although not particularly limited, the height H 1} of the lower end of the window portion 15 from the lower end of _{the storage bin 11 is 2/3 or less with respect to the total height H 0} of the storage bin 11 (see FIG. 1) (H ₁ ≦). 2/3 × H ₀ ), preferably 1/2 or less (H ₁ ≦ 1/2 × H ₀ ), and more preferably 1/3 or less (H ₁ ≦ 1/3 × H ₀ ). By providing the window portion 15 at the lower part of the storage bin 11 in this way, the imaging device 61 can easily take an image of the aggregate A immediately before being put into the aggregate measuring tank 4 from the discharge port 13. As a result, the aggregate particle size measuring system 60 can more accurately measure the particle size of the aggregate A charged into the mixer 5 via the aggregate measuring tank 4.

The window portion 15 is formed parallel to the vertical direction (vertical direction in the drawing), and the transparent member 16 is also provided parallel to the vertical direction (vertical direction in the drawing). That is, the window portion 15 and the transparent member 16 provided on the window portion 15 extend substantially in the vertical direction. Therefore, the load of the aggregate A applied to the transparent member 16 can be reduced. Further, since the load of the aggregate A applied to the transparent member 16 is reduced, it is possible to suppress the wear of the transparent member 16 caused by the contact and rubbing with the flowing aggregate A. This effect is particularly remarkable when the internal space of the bypass path 11d of the storage bin 11 is densely filled with the aggregate A and the aggregate A is in contact with the transparent member 16. .. Therefore, the durability of the transparent member 16 can be improved by providing the window portion 15 in parallel in the vertical direction.
Further, the window portion 15 may be formed so as to be inclined toward the inside of the storage bin 11. In addition, "the window portion 15 is formed to be inclined toward the inside of the storage bin 11" means that the window portion 15 is gradually inclined toward the internal space of the storage bin 11 from the bottom to the top. It means that it is formed.

Further, a dustproof cover 6 is attached to the outside of the storage bin 11 so as to cover the discharge port 13 of the storage bin 11. The mounting location of the dustproof cover 6 is below the window portion 15. That is, the window portion 15 is provided outside the dustproof cover 6.

Next, a method of measuring the particle size of the aggregate A stored in the storage bin 11 using the aggregate particle size measuring system 60 will be described with reference to FIGS. 2 to 5.

As shown in FIG. 2, the image pickup device 61 of the aggregate particle size measuring system 60 is provided so that the inside of the bypass path 11d can be photographed via the transparent member 16 of the window portion 15. That is, the image pickup apparatus 61 can photograph the aggregate A stored in the bypass path 11d through the window portion 15. Further, the image pickup device 61 is provided outside the dustproof cover 6. Further, a lighting fixture 65 is provided in the vicinity of the imaging device 61. The lighting fixture 65 irradiates the window portion 15 with light so that the imaging device 61 can easily photograph the inside of the bypass path 11d. The lighting fixture 65 can appropriately adjust the irradiation angle of the light so that the light is reflected by the transparent member 16 and the image pickup of the image pickup apparatus 61 is not hindered.

The image pickup apparatus 61 can photograph the state inside the bypass path 11d and acquire image data including an image of the aggregate A. The image data acquired by the image pickup apparatus 61 is a monochrome or color digital image. The image data may be a still image or a moving image. Further, the image of the aggregate A included in the image data may be an image of the aggregate A in a stationary state when the discharge port 13 of the storage bin 11 is in the closed state, and the discharge port 13 is in the open state. In some cases, it may be an image of the aggregate A in a state of flowing downward. Further, the image pickup apparatus 61 can acquire clearer image data by using infrared rays in the night vision mode in an environment where the brightness of the illumination is insufficient.

The image data acquired by the image pickup apparatus 61 is transmitted to the image processing apparatus 62. The image data processed by the image processing device 62 is analyzed by the particle size analysis device 63. The image processing device 62 and the particle size analysis device 63 function as one arithmetic unit 64. The arithmetic unit 64 measures, for example, the volume of the aggregate A from the image data acquired by the image pickup apparatus 61 using a known algorithm, and after sorting the volume of the aggregate A according to the threshold of the sieve. , The particle size of the new aggregate A is measured by calculating the weight from the volume of the aggregate A. As the above-mentioned known algorithm, for example, an improved N-Cut method (Improved Normalized Cuts Algorithm) can be exemplified. It should be noted that the accuracy of segmentation, which will be described later, may be improved by creating teacher data in which the contour line is corrected by human work and machine learning the above algorithm using the teacher data. Further, the method for measuring the particle size of the aggregate A by the arithmetic unit 64 is not particularly limited to the method described below. For example, teacher data in which contour lines of aggregates are added to 100 or more images is created, and a model for segmentation and calculation of particle size of aggregates is generated by machine learning using the teacher data, and this model is generated. It may be used as an algorithm.

Specifically, first, as shown in FIG. 3A, the arithmetic unit 64 binarizes the image data acquired by the image pickup device 61, and the aggregate particles Ap of the aggregate A included in the image data Ap. The edge of the image is extracted to obtain the contour line E, and each aggregate particle is separated by the contour line E and segmented. Then, as shown in FIG. 3B, the arithmetic unit 64 calculates the major axis L and the minor axis S of the aggregate particles Ap based on the contour line E of the segmented aggregate particles Ap. The actual lengths of the major axis L and the minor axis S are calculated based on the number of pixels on the image data.

Next, the arithmetic unit 64 sets each aggregate particle Ap included in the image data to the sieve mesh thresholds 0.075 mm, 0.15 mm, 0.3 mm, 0.6 mm, based on the length of the major axis L. Sort by 2.36 mm, 4.75 mm, 13.2 mm, 19 mm, 26.5 mm, 37.5 mm, 53 mm.

The arithmetic unit 64 calculates the weight of the aggregate A based on the volume of the aggregate particles Ap sorted according to the threshold value of the sieve. Specifically, the volume of the aggregate particles Ap is calculated as major axis L × minor axis S × height h (average of major axis L and minor axis S), and integrated for each threshold value of the sieve. Thereby, the volume of the aggregate A corresponding to each of the threshold values of the sieve can be calculated. Then, using the regression line shown in FIG. 4, the weight W of the aggregate A is calculated from the volume of the aggregate A integrated for each of the above-mentioned thresholds of the sieve. The relationship between the weight and the volume of the aggregate A may be calculated without specifying the threshold value of the sieve.

The coefficients α and intercept β of the regression line shown in FIG. 4 are based on the weight of the aggregate for each threshold value of the sieve measured in this test and the integrated volume thereof, which was measured in advance by performing the sieving test of the aggregate. It is preset by linear regression analysis. Further, this integrated volume is a numerical value calculated by using the above arithmetic unit 64 from the image data of the aggregate used in the sieving test. The black circles shown in FIG. 4 indicate the data of the weight and the integrated volume of the aggregate obtained in the above-mentioned prior sieving test.

That is, the weight W of the aggregate A is calculated by the following formula for each threshold value of the sieve.
W = α × Σ (L × S × h) + β
However, in the above formula, h is the height of each aggregate particle Ap, and is the average value of the major axis L and the minor axis S (h = (L + S) / 2). Further, Σ (L × S × h) is the total value of the volume of the aggregate for each threshold value of the sieve.

Then, the arithmetic unit 64 is based on the weight W of the aggregate A sorted according to the threshold value of the sieve, and as illustrated in Table 1, the particle size (particle size distribution) of the aggregate A stored in each storage bin 11 is used. ) Is calculated. The arithmetic unit 64 preferably calculates the particle size of the aggregate A described above based on a plurality of image data, thereby accurately measuring the particle size of the aggregate A stored in the storage bin 11. be able to. Further, the arithmetic unit 64 may calculate the average value of the particle sizes obtained from the plurality of image data as the particle size of the aggregate A. Table 1 below is only an example showing the particle size of the new aggregate calculated by the arithmetic unit 64.

The particle size of the aggregate A shown in Table 1 as the particle size distribution line shown in the graph D ₁ of the FIG.
The processing unit 64, based on the graph D ₁ calculated in this manner, to ensure the quality of aggregate A per each storage bin 11. _{Specifically, the particle size distribution line (actual distribution line D 1} ) of the graph calculated by the arithmetic unit 64 by analyzing the image data is compared with the target particle size distribution line (target distribution line D ₀ ), and both of them are compared. It can be confirmed that the smaller the difference, the higher the quality of the aggregate A.

The processing unit 64, based on the particle size of the measured aggregate, so that the actual close the distribution line D ₁ to the target distribution lines D _0, the correction amount for correcting the emission amount of aggregate A from each of the storage bins 11 It may be calculated. _{Although not particularly limited, for example, as shown in FIG. 5, the position where the actual distribution line D 1} is lower than the target distribution line D _{0 in the} region where the threshold value of the sieve is small (the region to the left of the graph in FIG. 5). In the case of, the arithmetic unit 64 increases the amount of aggregate A released from the storage bin 11 having a small particle size of the sieve threshold to bring the actual distribution line D1 closer to the target distribution line D0. Is calculated. _{On the other hand, when the actual distribution line D 1} is higher than the target distribution line D _{0 in the} region where the threshold of the sieve is small (the region to the left of the graph in FIG. 5), the arithmetic unit 64 determines the threshold of the sieve. Calculates a correction amount that reduces the amount of aggregate A released from the storage bin 11 having a small particle size so that the actual distribution line D ₁ approaches the target distribution line D _0. Then, the aggregate measuring tank 4 changes the target amount of the aggregate released from each storage bin 11 based on the correction amount calculated by the arithmetic unit 64. This allows the asphalt plant 100 to produce a better quality asphalt mixture.

As described above, the hot bin 10 of the asphalt plant 100 according to the present embodiment is transparent that closes the storage bin 11 for storing the aggregate A classified according to the particle size and the window portion 15 formed in the storage bin 11. It includes a member 16. As a result, for example, the imaging device 61 photographs the state of the aggregate A stored in the storage bin 11 via the transparent member 16 of the window portion 15, and based on the image data, the particle size of the aggregate A is measured. Can be measured.

That is, in the present embodiment, since it is not necessary to collect a sampling sample of the aggregate A from the storage bottle 11 and perform a sieving test, the particle size of the aggregate A is efficiently measured to improve the quality of the aggregate A. You can check. Therefore, according to the hot bin 10 and the asphalt plant 100 including the hot bin 10 according to the present embodiment, the quality control of the aggregate A stored in each storage bin 11 can be performed with a small work load. Further, since the operator can visually check the inside of the storage bin 11 from the outside of the hot bin 10 through the transparent member 16 of the window portion 15, the maintenance of the hot bin 10 is facilitated.

Further, the storage bin 11 of the hot bin 10 according to the present embodiment includes a storage chamber 11c for storing the aggregate A and a bypass path 11d that communicates with the storage chamber 11c and allows at least a part of the aggregate A to circulate. , The window portion 15 is formed in the bypass path 12. When the window portion 15 is provided on the bypass path 12, the pressure applied to the transparent member 16 of the window portion 15 by the aggregate A is higher than that when the window portion 15 is provided facing the storage chamber 11c. It becomes smaller. Therefore, according to the hot bin 10 according to the present embodiment, each storage bin 11 can last a long time.

Further, the aggregate particle size measuring system 60 provided in the asphalt plant 100 according to the present embodiment can take an image of the aggregate A stored in the storage bin 11 from the outside of the hot bin 10 through the window portion 15. A device 61 and a calculation device 64 for measuring the particle size of the aggregate A based on the image data captured by the image pickup device 61 are provided. As a result, the particle size of the aggregate A can be measured based on the image data, so that it is not necessary to carry out a sieving test of the sample sample of the aggregate A collected from each storage bin 11. Therefore, according to the asphalt plant 100 including the aggregate particle size measuring system 60 and the aggregate particle size measuring system 60 according to the present embodiment, the work load on the quality control of the aggregate A can be reduced.

Further, as shown in FIG. 1, the hot bin 10 of the asphalt plant 100 according to the present embodiment has a dustproof cover 6 that covers the discharge port 13 of the storage bin 11, the aggregate measuring tank 4, and the material input port 5a of the mixer 5. is doing. As a result, dust or aggregate A generated when the aggregate A falls from the discharge port 13 of the storage bin 11 toward the aggregate input port 4a of the aggregate measuring tank 4 is removed from the aggregate measuring tank 4 to the mixer 5. Dust that is generated when falling toward the material input port 5a is prevented from diffusing around.

Further, since the window portion 15 of the hot bin 10 and the image pickup device 61 of the aggregate particle size measurement system 60 according to the present embodiment are provided outside the dustproof cover 6, the image pickup device 61 is not affected by dust. , The state of the inside of the storage bin 11 can be photographed through the window portion 15.

The asphalt plant 100 according to the present embodiment does not have to be provided with the dustproof cover 6. Here, since the window portion 15 is provided in the bypass path 11d, the window portion 15 is located at a position farther from the discharge port 13 of the storage bin 11 as compared with the case where the window portion 15 is provided in the main body portion 11a. Have been placed. Therefore, even when the hot bin 10 does not have the dustproof cover 6, the influence of dust on the image data captured by the image pickup apparatus 61 can be reduced.

<< Second Embodiment >>
Hereinafter, the second embodiment of the present invention will be described with reference to FIG. In the asphalt plant 100 according to the second embodiment, the hot bin 20 shown in FIG. 6 is used instead of the hot bin 10 shown in FIGS. 1 and 2. Since the same reference numerals indicate the same or similar structures, detailed description thereof will be omitted below.

Like the hot bin 10, the hot bin 20 has a plurality of storage bins 21 for storing the aggregate A classified according to the particle size. As shown in FIG. 6, the storage bin 21 has a main body portion 21a formed so as to increase in width toward the top, and a gate portion 21b connected to the lower end of the main body portion 21a and forming a tubular shape. ing. The space inside the main body portion 21a and the gate portion 21b constitutes a storage chamber 21c for storing the aggregate A. A discharge port 23 is formed at the lower end of the gate portion 21b. A lid portion 14 for opening and closing the discharge port 23 is attached to the gate portion 21b.

Further, a window portion 25 is formed at the gate portion 21b of the storage bin 21. A transparent member 16 is fitted in the window portion 25. _{Although not particularly limited, the height H 2} of the lower end of the window portion 25 from the lower end of the storage bin 21 is 2/3 or less with respect to _{the total height H 0} (see FIG. 1) of the storage bin 21 _{(H 2} ≦). 2/3 x H ₀ ), preferably 1/2 or less (H ₂ ≤ 1/2 x H ₀ ), and more preferably 1/3 or less (H ₂ ≤ 1/3 x H ₀ ). By providing the window portion 25 at the lower part of the storage bin 21 in this way, the imaging device 61 can easily take an image of the aggregate A immediately before being put into the aggregate measuring tank 4 from the discharge port 13. As a result, the aggregate particle size measuring system 60 can more accurately measure the particle size of the aggregate A charged into the mixer 5 via the aggregate measuring tank 4.

The window portion 25 is formed parallel to the vertical direction (vertical direction in the drawing) like the window portion 15 shown in FIG. 2, and the transparent member 16 is also parallel to the vertical direction (vertical direction in the drawing). It is provided. Therefore, the load of the aggregate A applied to the transparent member 16 can be reduced, and the wear of the transparent member 16 can be suppressed. This effect is particularly remarkable when the gate portion 21b of the storage bin 21 is densely filled with the aggregate A and the aggregate A is in contact with the transparent member 16. .. Therefore, the durability of the transparent member 16 can be improved by providing the window portion 25 in parallel in the vertical direction.
Further, the window portion 25 may be formed so as to be inclined toward the inside of the storage bin 21. In addition, "the window portion 25 is formed to be inclined toward the inside of the storage bin 21" means that the window portion 25 is gradually inclined toward the internal space of the storage bin 21 from the bottom to the top. It means that it is formed.

A dustproof cover 6 is attached to the outside of the storage bin 21. The mounting location of the dustproof cover 6 is the outer wall surface of the main body portion 21a. The dustproof cover 6 covers the window portion 25 and the discharge port 23. Further, a storage portion 70 is arranged inside the dustproof cover 6. The storage portion 70 is a substantially cylindrical tubular member having openings formed at both ends 70a and 70b. Of the ends 70a and 70b of the storage portion 70, the opening of one end 70a arranged inside the dustproof cover 6 is an opening 71 for photographing. Further, the opening of the other end 70b of the storage portion 70 is an opening 72 for installing the device. One end 70a of the storage portion 70 is in close contact with the transparent member 16 of the window portion 25 so that the photographing opening 71 faces the window portion 25 of the storage bin 21. Further, the dustproof cover 6 is formed with a mounting opening 6a through which the storage portion 70 can be inserted. The other end 70b of the storage portion 70 projects to the outside of the dustproof cover 6 through the mounting opening 6a. That is, the device installation opening 72, which is an opening provided at the other end 70b of the storage portion 70, projects to the outside of the dustproof cover 6.

The image pickup device 61 is housed in the storage unit 70. Since the photographing opening 71 of the storage portion 70 faces the window portion 25, the image pickup device 61 of the aggregate particle size measuring system 60 passes through the photographing opening 71 and the transparent member 16 of the window portion 25 to store the storage bin 21. The aggregate A stored in the storage chamber 21c of the above can be photographed. Further, the image pickup device 61 can be taken in and out of the storage unit 70 through the device installation opening 72. A lighting device (not shown) for irradiating the window portion 25 with light may be provided inside the storage portion 70 so that the image pickup device 61 can easily photograph the aggregate A.

As described above, the hot bin 20 according to the present embodiment includes a storage unit 70 capable of storing the image pickup device 61. A part of the storage portion 70 is arranged inside the dustproof cover 6, and the storage portion 70 has a photographing opening 71 that opens toward the window portion 25 inside the dustproof cover 6. As a result, even when the dustproof cover 6 covers the window portion 25, by storing the image pickup device 61 in the storage section 70, the image pickup device 61 is not affected by dust, and the photographing opening 71 and the window portion are not affected. The aggregate A stored in the storage chamber 21c of the storage bin 21 can be photographed through the transparent member 16 of the 25.

Further, the storage portion 70 is a tubular member having openings at both ends. One opening of the storage portion 70 is a photographing opening 71, and the other opening is a device installation opening 72 projecting to the outside of the dustproof cover 6. As a result, the operator can store the image pickup device 61 in the storage unit 70 through the device installation opening 72, so that the image pickup device 61 can be installed inside the dustproof cover 6 and stored without being affected by dust. The aggregate A stored in the storage chamber 21c of the bottle 21 can be photographed.

<< Third Embodiment >>
Hereinafter, the third embodiment of the present invention will be described with reference to FIG. In the asphalt plant 100 according to the third embodiment, the hot bin 30 is used instead of the hot bins 10 and 20. The hot bin 30 has a storage section 170 instead of the storage section 70 of the hot bin 20.

As shown in FIG. 7, a storage portion 170 having one end 170a open and the other end 170b closed is provided inside the dustproof cover 6 of the hot bin 30. The opening at one end 170a of the storage portion 170 is an opening for photographing 171. The photographing opening 171 faces the window portion 25 of the storage bin 21. Further, the image pickup apparatus 61 is housed inside the storage unit 170. The image pickup apparatus 61 wirelessly transmits image data to the image processing apparatus 62. Not limited to this, the image pickup apparatus 61 may send image data to the image processing apparatus 62 by wire. Further, inside the storage portion 170, a lighting device (not shown) for irradiating the window portion 25 with light may be provided so that the image pickup device 61 can easily photograph the aggregate A.

As described above, the hot bin 30 according to the present embodiment includes a storage unit 170 capable of storing the image pickup device 61. The entire storage portion 170 is arranged inside the dustproof cover 6, and the storage portion 70 has a photographing opening 171 that opens toward the window portion 25 inside the dustproof cover 6. As a result, according to the hot bin 30 according to the present embodiment, similarly to the hot bin 20, the image pickup apparatus 61 is stored through the photographing opening 71 and the transparent member 16 of the window portion 25 without being affected by dust. The aggregate A of the storage chamber 21c of the bottle 21 can be photographed.

<< Fourth Embodiment >>
Hereinafter, the fourth embodiment of the present invention will be described with reference to FIG. In the asphalt plant 100 according to the fourth embodiment, the hot bin 40 shown in FIG. 8 is used instead of the hot bins 10 to 30.

The hot bin 40 has a plurality of storage bins 41 for storing the aggregate A classified according to the particle size. As shown in FIG. 8, the storage bin 41 has a main body portion 41a formed so as to increase in width toward the top, and a gate portion 41b connected to the lower end of the main body portion 41a to form a tubular shape. ing. The space inside the main body portion 41a and the gate portion 41b constitutes a storage chamber 41c for storing the aggregate A. A discharge port 43 is formed at the lower end of the gate portion 41b. A lid portion 14 for opening and closing the discharge port 43 is attached to the gate portion 41b. Further, a window portion 45 is formed in the main body portion 41a of the storage bin 41. A transparent member 16 is fitted in the window portion 45. Also in this embodiment, the lighting fixture 65 shown in FIG. 2 may be provided in the vicinity of the imaging device 61.

_{Also in the present embodiment, the height H 3} of the lower end of the window portion 45 from the lower end of the storage bin 41 is _{2/3 or less with respect to the total height H 0} of the storage bin 41 (see FIG. 1). (H ₃ ≤ 2/3 x H ₀ ), preferably 1/2 or less (H ₃ ≤ 1/2 x H ₀ ), and more preferably 1/3 or less (H ₃ ≤ 1/3). × H ₀ ). By providing the window portion 45 at the lower part of the storage bin 41 in this way, the imaging device 61 can easily take an image of the aggregate A immediately before being put into the aggregate measuring tank 4 from the discharge port 13. As a result, the aggregate particle size measuring system 60 can more accurately measure the particle size of the aggregate A charged into the mixer 5 via the aggregate measuring tank 4.

A dustproof cover 6 is attached to the outside of the storage bin 41. The mounting location of the dustproof cover 6 is the outer wall surface of the gate portion 41b. The dustproof cover 6 covers the discharge port 43. Further, the window portion 45 is provided outside the dustproof cover 6.

As described above, in the hot bin 40 according to the present embodiment, since the window portion 45 of the storage bin 41 is provided outside the dustproof cover 6, the image pickup device 61 is not affected by the dust and is not affected by the dust. The aggregate A of the storage chamber 41c can be photographed through the transparent member 16 of the 45.

Further, in the present embodiment, as shown in FIG. 9, the main body 41a of the storage bin 41 of the hot bottle 40 is provided with a recess 41d recessed inside the main body 41a, that is, toward the storage chamber 41c side. The window portion 45'may be formed in the recess 41d. By providing the recess 41d in the storage bin 41 in this way, the image pickup apparatus 61 can be arranged inside the recess 41d, and space can be saved. The image pickup device 61 may be arranged outside the recess 41d, and in this case as well, the image pickup device 61 can be brought close to the storage bin 41, and space can be saved. Further, although not particularly shown, the recess 41d may be provided in the gate portion 41b of the storage bin 41.

At this time, the window portion 45'is formed parallel to the vertical direction (vertical direction in the drawing) like the window portions 15 and 25, and the transparent member 16 is also parallel to the vertical direction (vertical direction in the drawing). (Θ = 90 °). Therefore, the load of the aggregate A applied to the transparent member 16 can be reduced, and the wear of the transparent member 16 can be suppressed. This effect is a state in which the storage chamber 41c of the storage bin 41 is densely filled with the aggregate A (a state as shown in FIG. 3A), and the aggregate A comes into contact with the transparent member 16. This is especially noticeable when you are in a state of being. Therefore, the durability of the transparent member 16 can be improved by providing the window portion 45'parallel to the vertical direction.
Further, the window portion 45'may be formed so as to be inclined toward the inside of the storage bin 41. In addition, "the window portion 45'is formed to be inclined toward the inside of the storage bin 41" means that the window portion 45'comes into the internal space (storage chamber 41c) of the storage bin 41 from the bottom to the top. It means that it is formed so as to gradually tilt toward it. In other words, the inclination angle θ of the window portion 45'with respect to the horizontal direction (horizontal direction in the drawing) may be less than 90 degrees (θ <90 °).

The height H ₄ of the lower end of the window portion 45'from the lower end of the storage bin 41 is the same as _{the height H 3 of the lower end of the window portion 45 with respect to the total height H 0} of the storage bin 41 (see FIG. 1). It is 2/3 or less (H ₃ ≦ 2/3 × H ₀ ), preferably 1/2 or less (H ₃ ≦ 1/2 × H ₀ ), and more preferably 1/3 or less (H 3 ≦ 1/2 × H 0). H ₃ ≤ 1/3 x H ₀ ).

<< Fifth Embodiment >>
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG. In the asphalt plant 100 according to the fifth embodiment, the hot bin 50 is used instead of the hot bins 10 to 40.

The hot bin 50 has a storage bin 41, a dustproof cover 6, and a storage portion 70. The dustproof cover 6 is attached to the main body 41a of the storage bin 41 and covers the window 45 and the discharge port 43. The storage unit 70 has an opening 71'for photographing, which faces the window portion 45 of the storage bin 41. The photographing opening 71'is formed so as to be inclined with respect to the axial direction of the storage portion 70 in accordance with the inclination angle of the main body portion 41a of the storage bin 41. A lighting device (not shown) for irradiating the window portion 45 with light may be provided inside the storage portion 70 so that the imaging device 61 can easily photograph the aggregate A. Further, in the form shown in FIG. 10, a recess as shown in FIG. 9 may be formed in the storage bottle 41.

As described above, the hot bin 50 according to the present embodiment includes a storage unit 70 capable of storing the image pickup device 61. Therefore, even when the dust-proof cover 6 covers the window portion 45, the image pickup apparatus 61 is not affected by dust inside the dust-proof cover 6, and passes through the photographing opening 71'and the transparent member 16 of the window portion 45. The aggregate A in the storage chamber 41c of the storage bin 41 can be photographed. Further, since the photographing opening 71'is inclined according to the inclination angle of the main body portion 41a of the storage bin 41, the gap between the photographing opening 71'and the transparent member 16 of the window portion 45 becomes small, and the storage portion It becomes difficult for dust to get inside the 70.

100 ... Asphalt plant 1 ... Dryer 3 ... Screen 4 ... Aggregate measuring tank 5 ... Mixer 5a ... Material inlet 6 ... Dustproof cover 10, 20, 30, 40, 50 ... Hot bin 11, 21, 41 ... Storage bin 11d ... Bypass Roads 13, 23, 43 ... Discharge ports 15, 25, 45 ... Window 16 ... Transparent member 41d ... Recess 60 ... Aggregate particle size measurement system 61 ... Imaging device 64 ... Arithmetic logic unit 70, 170 ... Storage section 71, 71', 171 ... Aperture for shooting

The present invention relates to Rukotsu material particle size measurement system and asphalt plant used to produce the asphalt mixture.

An object of the present invention is to provide a respective Rukotsu material particle measurement system and asphalt plant can make the stored quality control of aggregate in Hottobin with less work load.

[1] In order to solve the above problems, the aggregate particle size measuring system according to the present invention stores the aggregate classified according to the particle size in an asphalt plant for producing asphalt and an asphalt mixture containing the aggregate. An aggregate particle size measuring system for measuring the particle size of aggregate stored in a storage bin and a hot bin having a transparent member for closing a window formed in the storage bin, and outside the storage bin of the hot bin. Based on an image pickup device that is provided and capable of photographing the aggregate stored in the storage bin through the window portion and image data taken by the image pickup device, the particle size of the aggregate is determined. It is an aggregate particle size measuring system equipped with a computing device for measuring.

[ 8 ] The asphalt plant according to the present invention is an asphalt plant that produces an asphalt mixture containing asphalt and an aggregate, and has a dryer for heating the aggregate and the aggregate heated by the dryer in particle size. A screen that sifts according to the classification, a plurality of storage bins that store the aggregates sifted by the screen for each classification , and a transparent member that closes a window formed in each of the storage bins. A hot bottle provided, an aggregate measuring tank for measuring aggregates released from each of the plurality of storage bottles, a mixer for mixing the aggregate and the asphalt measured by the aggregate measuring tank, and the plurality. An aggregate particle size measuring system for measuring the particle size of the aggregate stored in each of the hot bins is provided , and the aggregate particle size measuring system is provided outside the storage bin of the hot bin and the window portion. An image pickup device capable of photographing the aggregate stored in the storage bin via the above, and a calculation device for measuring the particle size of the aggregate based on the image data taken by the image pickup device. It is an asphalt plant.

[ 9 ] In the above invention, the asphalt plant may be provided with a discharge port of the plurality of storage bottles, the aggregate measuring tank, and a dustproof cover covering the mixer.

In [1 0] the invention, the computing device, the computing device based on the particle size of the aggregate was calculated, and calculates a correction amount of the released amount of the aggregate from the storage bin, the aggregate metric The tank may change the amount of aggregate released from the plurality of storage bottles based on the amount of correction.

Claims (12)

A hot bin for storing the aggregate in an asphalt plant that produces an asphalt mixture containing asphalt and aggregate.
The hot bin
A storage bottle for storing the aggregate classified according to the particle size, and
A hot bottle comprising a transparent member for closing a window formed in the storage bottle. The hot bin according to claim 1.
The storage bottle
A storage room for storing the aggregate and
It has both ends connected to the storage chamber, communicates with the storage chamber through the both ends, and has a bypass path through which at least a part of the aggregate can pass.
The window portion is a hot bin provided in the bypass path. The hot bin according to claim 1 or 2.
The storage bottle has a discharge port for discharging the aggregate to the outside.
The hot bin
A dustproof cover attached to the storage bottle so as to cover the window portion and the discharge port,
Equipped with a storage unit that can store the image pickup device,
At least a part of the storage portion is arranged inside the dustproof cover.
The storage portion is a hot bin having a photographing opening that opens toward the window portion inside the dustproof cover. The hot bin according to claim 3.
The storage portion is a tubular member having openings at both ends.
The opening on one side of the storage portion is the opening for photographing.
The other opening of the storage portion is a hot bin projecting to the outside of the dustproof cover. The hot bin according to claim 1 or 2.
The storage bottle has a discharge port for discharging the aggregate to the outside.
The hot bottle comprises a dustproof cover attached to the storage bottle so as to cover the outlet.
The window portion is a hot bin provided outside the dustproof cover. The hot bin according to any one of claims 1 to 5.
The window portion is a hot bottle provided parallel to the vertical direction or inclined toward the inside of the storage bottle. The hot bin according to any one of claims 1 to 6.
The storage bottle has a recess that is recessed toward the inside of the storage bottle.
The window portion is a hot bin formed in the recess. An aggregate particle size measurement system that measures the particle size of aggregate stored in a hot bottle.
Imaging that is provided outside the storage bottle of the hot bottle according to any one of claims 1 to 7 and that the aggregate stored in the storage bottle can be photographed through the window portion. Equipment and
An aggregate particle size measurement system including an arithmetic unit that measures the particle size of the aggregate based on image data taken by the image pickup device. An asphalt plant that produces an asphalt mixture containing asphalt and aggregate.
A dryer that heats the aggregate and
A screen that sifts the aggregate heated by the dryer according to the particle size.
The hot bottle according to any one of claims 1 to 7, further comprising a plurality of storage bottles for storing the aggregates screened by the screen for each classification.
An aggregate measuring tank for measuring the aggregate released from each of the plurality of storage bottles, and an aggregate measuring tank.
An asphalt plant comprising a mixer that mixes the aggregate and the asphalt measured by the aggregate measuring tank. The asphalt plant according to claim 9.
An asphalt plant provided with outlets for the plurality of storage bottles, an aggregate measuring tank, and a dustproof cover for covering the mixer. The asphalt plant according to claim 9 or 10.
An aggregate particle size measuring system for measuring the particle size of the aggregate stored in each of the plurality of hot bins is provided.
The aggregate particle size measurement system is
An imaging device provided outside the storage bottle of the hot bottle and capable of photographing the aggregate stored in the storage bottle through the window portion.
An asphalt plant including an arithmetic unit for measuring the particle size of the aggregate based on image data taken by the imaging device. The asphalt plant according to claim 11.
The arithmetic unit calculates a correction amount of the amount of the aggregate released from the storage bottle based on the particle size of the aggregate calculated by the arithmetic unit.
The aggregate measuring tank is an asphalt plant that changes the amount of aggregate released from the plurality of storage bottles based on the corrected amount.

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