JP7302854B2 - Quality management system, asphalt plant and vehicle - Google Patents

Description

The present invention relates to an asphalt mixture quality control system and an asphalt plant and vehicle equipped with the same.

Asphalt mixtures are produced by mixing granular materials such as fillers, fine aggregates and coarse aggregates with asphalt at high temperatures. The produced asphalt mixture is transported to the pavement site and paved. The blending of the above granules and asphalt in the asphalt mixture is determined appropriately according to the pavement position of the asphalt mixture (for example, the surface layer of the road and its lower layer, etc.) and the required functions (drainage, slip resistance, etc.). .

If large foreign matter is contained in the asphalt mixture, it will cause damage after pavement, and if the temperature of the asphalt mixture is low, it will cause deterioration in workability during pavement. In addition, if the asphalt mixture is not properly blended, it causes poor pavement. Therefore, quality control of these is important.

Conventionally, as a quality control of asphalt mixture, after loading the asphalt mixture on the loading platform of the transportation vehicle in the asphalt plant, when the worker climbs on the loading platform and covers the asphalt mixture with a heat insulating sheet, the worker visually checks the asphalt mixture. They were checking the particle size and blending state of the mixture. Further, Patent Document 1 describes a system for measuring and managing the temperature of an asphalt mixture placed on a loading platform with a sensor such as a thermocouple when the asphalt mixture is transported by vehicle.

JP 2018-123587 A

When visually confirming the quality of the asphalt mixture as in the past, the confirmation result may not be accurate. On the other hand, in Patent Document 1, although accurate quality control can be performed using measurement data, only the temperature of the asphalt mixture at the sensor position is measured, and it is possible that sufficient quality control cannot be performed in such a limited range. There is also sex.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a quality control system or the like capable of suitably controlling the quality of an asphalt mixture.

A first invention for solving the above-mentioned problems is a camera for capturing an external image of an asphalt mixture in which granular material and asphalt are mixed, and a thermography camera for capturing a temperature distribution image of the asphalt mixture within an imaging range. and an information processing device for determining whether the quality of the asphalt mixture is acceptable from the appearance image and the temperature distribution image , and the camera can receive illumination light specularly reflected from the asphalt mixture to take a photograph. and the information processing device determines whether the mixture state of the asphalt mixture is a predetermined mixture state based on the brightness in the appearance image acquired from the camera as a pass/fail judgment regarding the quality of the asphalt mixture. It is a quality control system for an asphalt mixture characterized by determining whether or not it is .

According to the quality control system of the first invention, based on the appearance image of the asphalt mixture photographed by the camera and the temperature distribution image of the asphalt mixture obtained using the thermography camera, the quality of the asphalt mixture is determined. conduct. Therefore, accurate quality control is possible based on objective data. In addition, by using the image of the asphalt mixture for quality control, it becomes possible to perform quality control over a wide range of asphalt mixtures, and to perform quality control with higher accuracy.

The information processing device determines whether the maximum value of the size of the granular material exceeds a threshold based on the appearance image as a pass/fail determination of the quality of the asphalt mixture, and the temperature distribution image It is determined whether the temperature of the asphalt mixture is within the reference range based on. In particular, in the first invention , it is determined whether or not the blending state of the asphalt mixture is a predetermined blending state based on the appearance image .
As mentioned above, the items to be controlled by the quality control system are, for example, the size of the granules, the temperature of the asphalt mixture, and the blending state. Defects such as temperature and mixing conditions can be discovered.

A second invention is an asphalt plant for loading an asphalt mixture onto a loading platform of a vehicle, the asphalt plant being equipped with the quality control system of the first invention.
As a result, the quality control of the asphalt mixture in the asphalt plant can be suitably performed using the quality control system of the first invention.

For example, the asphalt plant has a mixing device for mixing the granular material and the asphalt, and the camera and the thermographic camera capture the asphalt mixture in the process of being discharged from the mixing device to the bed of the vehicle. to shoot. Alternatively, the asphalt plant may have a storage device for storing the asphalt mixture, and the camera and the thermography camera may photograph the asphalt mixture being discharged from the storage device to the bed of the vehicle. good.
This makes it possible to check the quality of the asphalt mixture just before shipment, and prevent the asphalt mixture with quality problems from being transported to the pavement site.

Further, the asphalt plant includes a mixing device for mixing the granular material and the asphalt, a storage device for storing the asphalt mixture, and a transport device for transporting the asphalt mixture discharged from the mixing device to the storage device. and wherein said camera and said thermographic camera photograph said asphalt mixture as it is being discharged from said mixing device to said conveying device.
This prevents asphalt mixtures of questionable quality from being stored in the storage device.

A third aspect of the invention is a vehicle for transporting an asphalt mixture on a carrier, the vehicle comprising the quality control system of the first aspect of the invention.
As a result, the quality control of the asphalt mixture transported by vehicle can be suitably performed using the quality control system of the first invention, and the asphalt mixture with quality problems can be prevented from being paved.

The vehicle has, for example, a cover that covers the entire surface of the cargo bed, and the cover can be opened and closed by an operation from outside the cargo bed.
With these types of vehicles, workers can cover all sides of the bed without having to climb onto the bed of the vehicle, eliminating the need for workers to climb onto the bed of the vehicle and cover the asphalt mixture with insulating sheets. , there is no risk of the worker falling from the loading platform. On the other hand, it is no longer possible to check the quality of the asphalt mixture by visual inspection when the asphalt mixture is covered with a sheet on the loading platform as in the conventional method. It is particularly effective to enable quality control from outside.
The camera and the thermographic camera photograph a plurality of photographing ranges by changing their directions, and the information processing device performs image correction according to the distance from the camera and the thermographic camera to the asphalt mixture in the photographing range. It is desirable to perform the acceptance/rejection determination after performing the inspection on the appearance image and the temperature distribution image.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a quality control system and the like that can appropriately control the quality of asphalt mixtures.

The figure which shows the outline of the asphalt plant 1. FIG. The figure which shows the A part of FIG. 4 is a diagram showing the hardware configuration of an information processing device 45; FIG. 4 is a flow chart showing the procedure for judging whether the quality of the asphalt mixture 43 is acceptable. An example of an appearance image I and a temperature distribution image T of an asphalt mixture 43. FIG. The figure explaining the difference in glossiness by particle size. An example in which the appearance image I is binarized. An example of photographing the asphalt mixture 43 discharged to the trolley 35 . FIG. 3 shows a vehicle 33 equipped with a quality control system 2;

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

[First Embodiment]
(1. Asphalt plant 1)
FIG. 1 is a diagram showing an outline of an asphalt plant 1 equipped with a quality control system according to an embodiment of the invention.

The asphalt plant 1 manufactures, stores, and loads an asphalt mixture 43 into a vehicle 33. As shown in FIG. , a hot bin 13, a stone dust silo 15, a stone dust elevator 17, an asphalt tank 19, an aggregate measuring tank 21, an asphalt measuring tank 23, a stone dust measuring tank 25, a mixer 27, a trolley 35, a hot silo 37, and the like.

The aggregate hopper 3 temporarily stores aggregates (fine aggregates and coarse aggregates) to be supplied to the production line of the asphalt mixture 43 at room temperature. The aggregate discharged from the aggregate hopper 3 is conveyed to the dryer 7 by the belt conveyor 5 . The dryer 7 heats and dries the aggregate. Heated and dried aggregates are conveyed to the screen 11 by the hot elevator 9 .

The screen 11 classifies the aggregate conveyed by the hot elevator 9 into each particle size division. The classified aggregates are kept warm and temporarily stored in hot bins 13 for each particle size division. Aggregate is supplied from the hot bin 13 to the aggregate weighing tank 21 when the asphalt mixture 43 is manufactured. The aggregate weighing tank 21 weighs the classified aggregate for each particle size division and feeds it into the mixer 27 .

The stone powder silo 15 temporarily stores stone powder used as a filler at room temperature. Stone powder is, for example, powdered limestone. The filler is conveyed to the stone powder measuring tank 25 by the stone powder elevator 17 . The stone powder weighing tank 25 weighs the filler and puts it into the mixer 27 .

The asphalt tank 19 keeps the asphalt warm and stores it in liquid form. Asphalt is conveyed to the asphalt weighing tank 23 by an asphalt pump (not shown). The asphalt weighing tank 23 weighs the asphalt and feeds it into the mixer 27 .

The mixer 27 is a mixing device that mixes granular materials such as fillers and aggregates (fine aggregates and coarse aggregates) with asphalt to produce an asphalt mixture 43 . The mixer 27 discharges the asphalt mixture 43 to the bed of the vehicle 33 and the trolley 35 .

The trolley 35 is a conveying device that conveys the asphalt mixture 43 produced by the mixer 27 to the hot silo 37 . The hot silo 37 is a storage device that keeps and stores the asphalt mixture 43 . The hot silo 37 discharges the asphalt mixture 43 to the bed of the vehicle 33 .

A camera 29 and a thermography camera 31 are provided in the vicinity of the outlet for discharging the asphalt mixture 43 from the mixer 27 and the outlet for discharging the asphalt mixture 43 from the hot silo 37, respectively.

The camera 29 photographs the asphalt mixture 43 in the process of being discharged from the mixer 27 or the hot silo 37 to obtain an external image of the asphalt mixture 43 .

The camera 29 is a digital camera having an optical lens, an image sensor, an A/D (Analog/Digital) converter, and the like. In the camera 29, the light received through the optical lens is photoelectrically converted by the imaging device to generate an analog image signal. Then, the analog image signal is converted into digital image data by the A/D converter to generate an appearance image of the asphalt mixture 43 . Although not shown in the figure, there is also provided near the camera 29 an illumination light for illuminating the photographing range of the asphalt mixture 43 .

The thermography camera 31 photographs the asphalt mixture 43 being discharged from the mixer 27 or the hot silo 37 to obtain a temperature distribution image of the asphalt mixture 43 .

The thermography camera 31 has a germanium lens, an infrared detection element, an amplifier, an A/D converter, and the like. In the thermography camera 31, the germanium lens collects the infrared rays emitted from the photographing range, forms an image on the infrared detection element, and the infrared detection element converts the image into an electric signal. A temperature distribution image of the asphalt mixture 43 is generated by converting an analog image signal generated by amplifying the electric signal by an amplifier into digital image data by the A/D converter.

FIG. 2 is a diagram showing part A of FIG. As mentioned above, the asphalt mixture 43 is discharged from the outlet of the mixer 27 to the bed 39 of the vehicle 33 .

As shown in FIG. 2, the quality control system 2 according to the embodiment of the present invention has an information processing device 45 in addition to the camera 29 and the thermography camera 31 described above.

The information processing device 45 receives the appearance image and the temperature distribution image of the asphalt mixture 43 from the camera 29 and the thermography camera 31, and uses these images to determine the quality of the asphalt mixture 43, as will be described later.

FIG. 3 is a diagram showing the hardware configuration of the information processing device 45. As shown in FIG. The information processing device 45 can be realized by a computer or the like in which the control unit 47, the display unit 49, the input unit 51, the storage unit 53, the communication unit 55, the peripheral device I/F (Interface) unit 57, etc. are connected by a bus. However, without being limited to this, various configurations can be appropriately adopted.

The control unit 47 is composed of a CPU, ROM, RAM, and the like. The CPU calls a program related to processing of the information processing device 45 stored in a storage medium such as the storage unit 53 or ROM to a work area on the RAM and executes the program. ROM is non-volatile memory that permanently holds programs such as boot programs and BIOS, and data. The RAM is a volatile memory that temporarily holds programs and data loaded from the storage unit 53, ROM, etc., and has a work area used by the control unit 47 to perform various processes.

The display unit 49 has a display device such as a liquid crystal display or an OLED (Organic Light Emitting Diode) display.
The input unit 51 has a pointing device such as a mouse and a keyboard, and an input device such as a numeric keypad.

The storage unit 53 is a hard disk drive, a solid state drive, or the like, and stores programs executed by the control unit 47, data necessary for executing the programs, an OS, and the like. The storage unit 53 also stores a program for the information processing device 45 to execute pass/fail determination processing, which will be described later.

The communication unit 55 is a communication interface that mediates communication between the information processing device 45 and a network (not shown).
A peripheral device I/F unit 57 is a port for connecting a peripheral device. The information processing device 45 transmits and receives data to and from peripheral devices such as the camera 29 and the thermography camera 31 via the peripheral device I/F unit 57 .

Returning to the description of FIG. The vehicle 33 is a transport vehicle that transports the asphalt mixture 43 to the pavement site. Further, the vehicle 33 has a cover 41 that covers the entire surface of the cargo bed 39, and the cover 41 can be opened and closed by an operation from outside the cargo bed 39. As shown in FIG.

That is, the cover 41 is composed of a hood and a plurality of frameworks (not shown), and is extendable in a bellows shape. fixed to the front of the The wire 40 is wound around pulleys 42a and 42b provided at the front and rear of the cargo bed 39. When a handle 44 provided outside the cargo bed 39 is rotated, the wire 40 is moved by the rotation of the pulley 42a. Thereby, the one end of the cover 41 can be moved forward or backward of the loading platform 39 . When the end is moved toward the rear of the loading platform 39, the cover 41 extends to close the loading platform 39, and when the end is moved forward of the loading platform 39, the cover 41 contracts and the loading platform 39 is closed. is opened. FIG. 2 shows a state in which the cover 41 is contracted and the loading platform 39 is opened.

With such a type of vehicle 33 , the worker can cover the entire surface of the loading platform 39 without climbing onto the loading platform 39 of the vehicle 33 . Therefore, after loading the asphalt mixture 43 on the loading platform 39, the worker does not need to climb onto the loading platform 39 of the vehicle 33 and cover the asphalt mixture 43 with a heat insulating sheet as in the conventional art, and the worker falls off the loading platform 39. no more danger.

(2. Pass/fail judgment on the quality of the asphalt mixture 43)
FIG. 4 is a flow chart showing the procedure for judging the quality of the asphalt mixture 43 performed by the quality control system 2 . Each step in FIG. 4 is executed by the control section 47 of the information processing device 45 controlling each section of the information processing device 45 .

As shown in FIG. 2, in this embodiment, the asphalt mixture 43 being discharged from the mixer 27 to the loading platform 39 of the vehicle 33 is photographed by the camera 29 and the thermography camera 31. (S101), and a temperature distribution image of the asphalt mixture 43 is received from the thermography camera 31 (S102).

FIG. 5(a) is an example of an appearance image I of the asphalt mixture 43. FIG. In appearance image I, each grain mixed with asphalt is recognizable. The particle size of the granular material increases in the order of the filler 431 , the fine aggregate 432 and the coarse aggregate 433 . In brief, the appearance image I has a shape in which the gaps between the coarse aggregates 433 are filled with the fine aggregates 432 and the fillers 431, and the gaps between the fine aggregates 432 are also filled with the fillers 431. It's becoming

FIG. 5(b) is an example of the temperature distribution image T of the asphalt mixture 43. FIG. The pixel value of each pixel of the temperature distribution image T corresponds to the temperature of the asphalt mixture 43 at the position corresponding to the pixel. be visualized.

While a predetermined amount of asphalt mixture 43 is falling from the mixer 27 onto the loading platform 39 of the vehicle 33, the camera 29 and the thermography camera 31 capture an external image I and a temperature distribution image T of the falling asphalt mixture 43 at predetermined time intervals. ,get. The interval of photographing the asphalt mixture 43 is appropriately set, and a part or all of a predetermined amount of the asphalt mixture 43 discharged from the mixer 27 is photographed. In the former case, the quality control of the predetermined amount of asphalt mixture 43 can be performed using the partial appearance image I and the temperature distribution image T, so the processing load on the information processing device 45 is small. By photographing the entire asphalt mixture 43, more reliable quality control becomes possible.

The information processing device 45 uses the appearance image I and the temperature distribution image T to determine whether the quality of the asphalt mixture 43 is acceptable.

As this pass/fail determination, in the present embodiment, the information processing device 45 obtains the maximum area of the granules of the asphalt mixture 43 contained in the appearance image I as the maximum size of the granules, and the maximum area exceeds the threshold value. (S103). The maximum area can be obtained, for example, by extracting the edges of the appearance image I and obtaining the area of the largest closed area surrounded by the edges, but is not limited to this and various known methods can be used. . The threshold value can be determined according to the designed particle size distribution and the like, and by comparing the maximum area with the threshold value, it is possible to detect the presence of foreign matter having a size that deviates from the designed particle size distribution.

The information processing device 45 also determines whether or not the asphalt mixture 43 is in a predetermined mixing state based on the appearance image I (S104). The blending state means what is blended in the asphalt mixture 43 and in what amount, and includes filler 431, fine aggregate 432, coarse aggregate 433, blending amount of asphalt, type of asphalt, etc., which will be described later. .

The above determination can be made using the gloss of the asphalt mixture 43, for example. That is, when the imaging range of the asphalt mixture 43 is irradiated with illumination light and photographed by the camera 29, the granules of the filler 431, the fine aggregate 432, and the coarse aggregate 433 differ in gloss, and in the external image I different brightness. For example, as briefly shown in FIG. 6( a ), the coarse aggregate 433 having a large particle diameter is likely to have a smooth surface where the illumination light L is specularly reflected, and the specularly reflected illumination light L is likely to be glossy. By receiving light, the appearance image I appears bright. On the other hand, as shown in FIG. 6B, in the filler 431 with a small particle size, the illumination light L is likely to be diffusely reflected (see L' in the figure) due to its fine unevenness, and the amount of light received by the camera 29 is reduced. Therefore, it tends to appear dark in the appearance image I.

Therefore, when the blending amount of the coarse aggregate 433 is large, the appearance image I has many high-brightness regions, and when the blending amount of the filler 431 is large, the appearance image I has few high-brightness regions. In addition, when the blending amount of asphalt is large, the asphalt adheres to the surface of the granules to form a smooth surface, which tends to produce gloss, and the overall appearance image I tends to be bright. Further, when asphalt to which a resin such as a polymer is added is used, the appearance image I becomes brighter due to the gloss of the resin.

As described above, the blending state of the asphalt mixture 43 is appropriate according to conditions such as the pavement position of the asphalt mixture 43 (for example, the surface layer of the road and its lower layer, etc.) and the required functions (drainage, slip resistance, etc.). The amount of filler 431, fine aggregate 432, coarse aggregate 433, asphalt, type of asphalt, and the like also differ according to the above conditions.

Therefore, in S104, for example, as shown in FIG. 7, the exterior image I is binarized with a predetermined threshold, and it is determined whether or not the area of the bright region at that time is within a predetermined range. The threshold value and the predetermined range are set based on a predetermined design mixing state (predetermined mixing state) for the asphalt mixture 43, and when the area of the bright region is not within the predetermined range, the asphalt mixture 43 is not the predetermined mixing state.

The information processing device 45 also determines whether the temperature of the asphalt mixture 43 is within the reference range based on the temperature distribution image T (S105). This reference range is set appropriately in advance. For example, if the maximum and minimum values of the temperature in the temperature distribution image T are within the reference range, the temperature of the asphalt mixture 43 is considered to be within the reference range. , the determination method is not limited to this.

The information processing device 45 determines that the maximum value of the particle size of the asphalt mixture 43 is equal to or less than the threshold value (S103; NO), the blending state of the asphalt mixture 43 is a predetermined blending state (S104; YES), and the asphalt mixture If the temperature of 43 is within the reference range (S105; YES), the quality of the asphalt mixture is determined to be acceptable, the result is displayed on the display unit 49 (S106), and the process is terminated.

On the other hand, if the maximum value of the size of the particles of the asphalt mixture 43 exceeds the threshold value (S103; YES), or if the mixing state of the asphalt mixture 43 is not the predetermined mixing state (S104; NO ), or if the temperature of the asphalt mixture 43 is out of the standard range (S105; NO), the quality of the asphalt mixture is determined to be unacceptable, and a warning screen is displayed on the display unit 49 to issue a warning (S107). , terminate the process.

The above is an example of judging whether or not the quality of the asphalt mixture 43 discharged from the mixer 27 to the loading platform 39 of the vehicle 33 is acceptable. , the asphalt mixture 43 discharged from the hot silo 37 to the loading platform 39 of the vehicle 33 can be similarly judged. As a result, it is possible to detect changes in the quality of the asphalt mixture 43 during storage, such as when the asphalt remaining in the hot silo 37 is carbonized and turns into foreign matter with a large particle size, which is mixed into the asphalt mixture 43.

As described above, according to the quality control system 2 of the present embodiment, the appearance image I of the asphalt mixture 43 photographed by the camera 29 and the temperature distribution image T of the asphalt mixture 43 obtained using the thermography camera 31 The quality of the asphalt mixture 43 is determined based on the above. Therefore, accurate quality control is possible based on objective data. In addition, by using the image of the asphalt mixture 43 for quality control, it is possible to perform quality control over a wide range of asphalt mixtures 43, and to perform quality control with higher accuracy.

As mentioned above, the control items by the quality control system 2 can be the size of the granules, the temperature of the asphalt mixture 43, the blending state, etc. By controlling these, it is possible to prevent the mixing of foreign substances with sizes outside the designed particle size distribution, the asphalt It is possible to discover the temperature of the mixture, the failure of the blending state, and the like.

Further, in this embodiment, by providing the quality control system 2 in the asphalt plant 1 , the quality control of the asphalt mixture 43 in the asphalt plant 1 can be suitably performed using the quality control system 2 . In this embodiment, by photographing the asphalt mixture 43 in the middle of being discharged from the mixer 27 or the hot silo 37 to the loading platform 39 of the vehicle 33, the quality of the asphalt mixture 43 immediately before shipment can be confirmed, and asphalt with quality problems can be detected. It can prevent the mixture from being transported to the pavement site.

However, the present invention is not limited to this. For example, as shown in FIG. 8, an appearance image I and a temperature distribution image T of the asphalt mixture 43 being discharged from the mixer 27 to the trolley 35 are acquired by the camera 29 and the thermography camera 31, and the appearance image I and the temperature distribution image are obtained. It is also possible to perform the pass/fail determination based on T. The asphalt mixture 43 determined to be rejected is discharged from the trolley 35 to a defective product discharge unit (not shown), thereby preventing the asphalt mixture 43 having quality problems from being stored in the hot silo 37 .

Also, the control items in the quality control system 2 are not limited to those described above, but may be related to the quality of the asphalt mixture 43, as long as it is possible to determine acceptance or rejection from the appearance image I and the temperature distribution image T described above.

Next, a second embodiment of the invention will be described. 2nd Embodiment mainly demonstrates a different point from 1st Embodiment, A description is abbreviate|omitted by attaching|subjecting the same code|symbol in a figure etc. about the same point.

[Second embodiment]
In the second embodiment, the quality control system 2 is provided in the vehicle 33 described above, and the quality of the asphalt mixture 43 transported by the vehicle 33 is determined as described above.

Therefore, in this embodiment, as shown in FIG. 9, a camera 29 and a thermographic camera 31 are arranged inside the loading platform 39 to photograph the asphalt mixture 43 placed on the loading platform 39 . The information processing device 45 is placed in the driver's seat or the like, and uses the exterior image I and the temperature distribution image T obtained from the camera 29 and the thermography camera 31 to perform pass/fail determination in the same manner as in the first embodiment.

As a result, in the second embodiment, the quality control of the asphalt mixture 43 transported by the vehicle 33 can be suitably performed while sitting in the driver's seat, etc. It can be prevented from being paved. Also, changes in the quality of the asphalt mixture 43 during transportation, such as a temperature drop of the asphalt mixture 43, can be detected.

As described above, the vehicle 33 has the cover 41 that covers the entire surface of the loading platform 39, and the cover 41 can be opened and closed by operating from outside the loading platform 39. The entire surface of the loading platform 39 can be covered with a cover. Therefore, after loading the asphalt mixture 43 on the loading platform 39 of the vehicle 33 in the asphalt plant 1, there is no need for the worker to climb onto the loading platform 39 of the vehicle 33 and cover the asphalt mixture 43 with a heat insulating sheet. No danger of falling. On the other hand, since it is no longer possible to check the quality of the asphalt mixture 43 visually when the asphalt mixture 43 is covered with a heat-retaining sheet on top of the cargo bed 39 as in the conventional art, the quality control system 2 is used to check the quality of the asphalt mixture 43 . It is particularly effective to enable quality control from outside. However, the vehicle provided with the quality control system 2 is not limited to this.

In the second embodiment, the information processing device 45 corrects the appearance image I and the temperature distribution image T according to the distance from the camera 29 or thermographic camera 31 to the asphalt mixture 43 in the photographing range. , it is also possible to perform the pass/fail determination. Thereby, the direction of the camera 29 or the thermography camera 31 is changed to photograph a plurality of photographing ranges in front and behind the loading platform 39, and the quality control of the asphalt mixture 43 photographed in each photographing range can be preferably performed.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the technical ideas disclosed in the present application, and these also belong to the technical scope of the present invention. Understood.

1: Asphalt plant 2: Quality control system 27: Mixer 29: Camera 31: Thermographic camera 33: Vehicle 35: Trolley 37: Hot silo 39: Bed 41: Cover 43: Asphalt mixture 45: Information processor 431: Filler 432: Fine Aggregate 433: Coarse aggregate I: Appearance image T: Temperature distribution image

Claims (9)

A camera that captures an external image of an asphalt mixture in which granular material and asphalt are mixed;
a thermographic camera that acquires a temperature distribution image of the asphalt mixture within an imaging range;
an information processing device that determines whether the quality of the asphalt mixture is acceptable from the appearance image and the temperature distribution image;
and
The camera is arranged so as to receive illumination light specularly reflected from the asphalt mixture and perform photography,
The information processing device determines whether or not the mixture state of the asphalt mixture is a predetermined mixture state based on the brightness in the appearance image acquired from the camera as a pass/fail judgment regarding the quality of the asphalt mixture. A quality control system for an asphalt mixture characterized by performing The information processing device determines whether or not the maximum value of the size of the granular material exceeds a threshold based on the appearance image as a pass/fail determination regarding the quality of the asphalt mixture, and the temperature distribution image 2. The quality control system for asphalt mixtures according to claim 1, wherein it is determined whether or not the temperature of said asphalt mixture is within a reference range. 3. An asphalt plant for loading an asphalt mixture onto a carrier of a vehicle, comprising the quality control system according to claim 1 or 2 . The asphalt plant has a mixing device for mixing the granular material and the asphalt,
4. The asphalt plant according to claim 3 , wherein said camera and said thermographic camera photograph said asphalt mixture in the process of being discharged from said mixing device onto the bed of said vehicle. The asphalt plant has a storage device for storing the asphalt mixture,
5. The asphalt plant according to claim 3 or 4 , wherein said camera and said thermographic camera photograph said asphalt mixture in the process of being discharged from said storage device to the bed of said vehicle. The asphalt plant is
a mixing device for mixing the granular material and the asphalt;
a storage device for storing the asphalt mixture;
a conveying device for conveying the asphalt mixture discharged from the mixing device to the storage device;
has
6. The asphalt plant according to any one of claims 3 to 5 , wherein the camera and the thermography camera photograph the asphalt mixture being discharged from the mixing device to the conveying device. A vehicle for transporting an asphalt mixture on a carrier, comprising the quality control system according to claim 1 or 2 . 8. The vehicle according to claim 7 , further comprising a cover that covers the entire surface of the cargo bed, and that the cover can be opened and closed by an operation from outside the cargo bed. The camera and the thermography camera change their orientation to photograph a plurality of imaging ranges,
The information processing device performs image correction according to the distance from the camera and the thermography camera to the asphalt mixture in the imaging range for the appearance image and the temperature distribution image, and then performs the pass/fail determination. Vehicle according to claim 7 or claim 8, characterized in that.

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