JP2018155612A - Imaging device for particle size distribution measurement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device capable of causing a material to smoothly flow down for a deflection plate having a pin.SOLUTION: An imaging device 2A for grain size distribution includes flow regulation plates 21, 22 having a surface to which a material 3 flows down from the upstream side toward the downstream side. The imaging device 2A is provided in the downstream side of the flow regulation plates 21, 22, and includes: a screen 30 off set on the back side for the flow regulation plates 21, 22; and an imaging part 50 for imaging the material 3 that passes through a space of the top side of the screen 30. The top surfaces of the flow regulation plates 21, 22 are formed upright with rotational pins 25, and a rotational pin 25 is axially rotatable relative to the flow regulation plates 21, 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image capturing apparatus used for measuring a particle size distribution of a material.

A batcher plant, a CSG (Cemented Sand and Gravel) mixing plant, or the like is used in the process of manufacturing concrete in the construction of a dam or the like.
In these plants, it is necessary to grasp the particle size distribution of materials for the quality control of concrete. Therefore, it has been proposed to photograph the flowing material and measure the particle size distribution of the material based on the photographing result.

As an image capturing device for particle size distribution measurement, the current plate flows down from the upstream side toward the downstream side, the screen provided on the downstream side of the current plate, the imaging unit provided on the front side of the screen, (For example, refer patent document 1).
In the image capturing apparatus described above, a plurality of protrusions are formed on the surface of the current plate. If it does in this way, the material which flows down on the surface of a baffle plate will be spread | diffused in contact with protrusion. Thereby, since the material which flows down from a baffle plate is rectified, the precision of a particle size distribution measurement can be improved.

Japanese Patent No. 5908811

  In the image capturing apparatus described above, when the viscosity of the material is large or when the viscosity of the material adheres to the surface of the material, the material adheres to the protrusions and becomes a lump, which makes it difficult for the material to flow on the surface of the current plate. There is a case.

  An object of the present invention is to solve the above-described problems and to provide an image photographing device capable of smoothly flowing material to a current plate having pins.

  In order to solve the above-mentioned problems, the present invention is an image capturing device for measuring a particle size distribution, and includes a rectifying plate in which material flows down from an upstream side to a downstream side. Further, the image photographing device is provided on the downstream side of the rectifying plate and is offset to the back side with respect to the rectifying plate, and a photographing unit for photographing the material passing through the space on the front side of the screen, It has. A rotation pin is erected on the surface of the current plate, and the rotation pin is attached to the current plate so as to be rotatable about an axis.

  In the image capturing apparatus of the present invention, when the material flows down with respect to the current plate, the material comes into contact with the rotating pin, so that the material is diffused and rectified. Since the rectified material is photographed by the photographing unit on the front side of the screen, the accuracy of the particle size distribution measurement performed based on the material image can be increased.

  Further, in the image photographing apparatus of the present invention, even if material adheres to the upper side of the rotating pin, the material moves to the lower side of the rotating pin as the rotating pin rotates, so that the material is easily peeled off from the rotating pin. As a result, the lump of material hardly adheres to the rotating pin. Thereby, in the image photographing device of the present invention, the material can be smoothly rectified by causing the material to smoothly flow down with respect to the rectifying plate having the rotating pin.

  In the above-described image capturing device for measuring the particle size distribution, when the plurality of rotating pins are erected on the surface of the rectifying plate, the material flowing down the surface of the rectifying plate can be effectively diffused.

  In the above-described image capturing device for measuring the particle size distribution, it is preferable to provide a driving device for rotating the rotating pin around the axis. In this configuration, the material adhering to the upper side of the rotating pin can be reliably moved to the lower side of the rotating pin. Moreover, the material adhering to the rotating pin is easily peeled off from the rotating pin by the centrifugal force generated by the rotation of the rotating pin.

  In the image capturing apparatus for particle size distribution measurement according to the present invention, the rotation pin rotates, so that a lump of material hardly adheres to the rotation pin. Thereby, a material can be smoothly flowed down to the baffle plate which has a rotation pin, and a material can be rectified.

It is a whole lineblock diagram showing the particle size distribution measuring system concerning a first embodiment of the present invention. It is a perspective view showing the rectification part concerning a first embodiment of the present invention. It is a whole block diagram which shows the particle size distribution measuring system which concerns on 2nd embodiment of this invention.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the description of each embodiment, the same constituent elements are denoted by the same reference numerals, and redundant descriptions are omitted.
In the present embodiment, a case will be described in which the image capturing device of the present invention is applied to a particle size distribution measuring system for measuring the particle size distribution of a material in a concrete manufacturing process.

[First embodiment]
As shown in FIG. 1, the particle size distribution measuring system 1 of the first embodiment is based on an image capturing device 2A for capturing the material 3 and the image of the material 3 obtained from the image capturing device 2A. And a calculation unit 60 that calculates the distribution. In addition, the particle size distribution measuring system 1 includes a belt conveyor 10 that conveys the material 3 to the image capturing device 2A, and a hopper 80 that accommodates the material 3 that has passed through the image capturing device 2A.

The belt conveyor 10 is for supplying the granular material 3 containing a coarse particle material (such as aggregate) and a fine particle material (such as earth and sand) to a rectifying unit 20 described later.
The belt conveyor 10 includes upstream and downstream pulleys 11 and 11, an endless belt 12 wound around the pulleys 11 and 11, and a motor (not shown) that rotates the upstream pulley 11. ing.

  The image capturing apparatus 2 </ b> A includes a rectifying unit 20 provided on the downstream side of the belt conveyor 10, a screen 30 provided on the downstream side of the rectifying unit 20, an illumination unit 40 that illuminates the screen 30, and a space on the front side of the screen 30. And an imaging unit 50 for imaging the material 3 passing through.

  As shown in FIG. 2, the rectifying unit 20 includes front and rear two rectifying plates 21 and 22 and left and right side walls 23 and 23. Both the rectifying plates 21 and 22 and the side walls 23 and 23 are formed so as to form a rectangular tube-shaped duct.

  As shown in FIG. 1, the front and rear rectifying plates 21 and 22 are arranged such that the normal lines of the front and rear planes are arranged in the horizontal direction. The front and rear rectifying plates 21 and 22 are arranged in parallel with an interval in the front-rear direction. The rear surface 21a of the front rectifying plate 21 and the front surface 22a of the rear rectifying plate 22 (“surface” in the claims) are opposed to each other with an interval in the front-rear direction.

The upper end portion of the rear rectifying plate 22 is inclined rearward (see FIG. 2). Further, the upper end portion of the front rectifying plate 21 protrudes above the upper edge portion of the rear rectifying plate 22.
As shown in FIG. 2, the left and right side walls 23, 23 are attached to the side edges of the front and rear rectifying plates 21, 22. The upper edge portions of the side walls 23, 23 are disposed below the upper edge portions of the both rectifying plates 21, 22.

As shown in FIG. 1, the upper opening 20 a of the rectifying unit 20 is disposed below the downstream end of the endless belt 12. The material 3 discharged from the endless belt 12 flows into the upper opening 20 a of the rectifying unit 20.
The upper end portion of the rear rectifying plate 22 is inclined rearward, and the space between the front and rear rectifying plates 21 and 22 is widened above the upper opening 20a, so that the material 3 enters the upper opening 20a. easy.
Further, since the front rectifying plate 21 protrudes above the upper opening 20a, the material 3 discharged from the endless belt 12 can be prevented from jumping out to the front of the front rectifying plate 21.

  The material 3 that has flowed into the rectifying unit 20 flows down along the rear surface 21 a of the front rectifying plate 21 and the front surface 22 a of the rear rectifying plate 22. Then, it flows down from the lower opening 20b of the rectifying unit 20 vertically downward along a linear track (rail).

In the rectifying unit 20 of the first embodiment, as shown in FIG. 2, three rotating pins 25 are erected on the rear surface 21 a of the front rectifying plate 21 and the front surface 22 a of the rear rectifying plate 22.
The rotation pin 25 is a member having a circular axial cross section. As shown in FIG. 1, the axial direction of the rotating pin 25 is arranged perpendicular to the rear surface 21 a of the front rectifying plate 21 and the front surface 22 a of the rear rectifying plate 22. That is, the rotation pin 25 extends horizontally in the front-rear direction.

A front end portion 25 a of the rotation pin 25 is inserted into a mounting hole 21 b formed in the front rectifying plate 21, and is pivotally supported by a bearing provided on the front surface 21 c of the front rectifying plate 21.
The rear end portion 25b of the rotating pin 25 is inserted into a mounting hole 22b formed in the rear current plate 22 and protrudes toward the rear surface 22c of the rear current plate 22.
The front end portion 25a and the rear end portion 25b of the rotation pin 25 are attached to the front and rear rectifying plates 21 and 22 so as to be rotatable about the axis.

In the first embodiment, as shown in FIG. 2, one rotating pin 25 is arranged on the upper part of the rectifying unit 20, and two rotating pins 25, 25 are arranged on the lower part of the rectifying unit 20.
The upper rotation pin 25 is disposed at the center in the left-right direction of the rectification unit 20, and the lower two rotation pins 25, 25 are disposed on the left and right sides of the upper rotation pin 25.

In the image capturing device 2A of the first embodiment, as shown in FIG. 1, a drive device 26 for rotating the rotary pin 25 about its axis is provided.
The drive device 26 of the first embodiment is an electric motor and is attached to the rear surface 22c of the rear rectifying plate 22. In addition, a driving device 26 is provided for each of the three rotation pins 25. Therefore, the three driving devices 26 are arranged on the rear surface 22 c of the rear rectifying plate 22 in accordance with the positions of the three rotation pins 25.
A rear end portion 25 b of the rotation pin 25 is connected to the output shaft of the driving device 26. Thereby, the rotation pin 25 rotates around the axis in conjunction with the rotation of the output shaft of the driving device 26.

As shown in FIG. 1, the screen 30 is a flat plate provided on the downstream side of the rectifying unit 20 (see FIG. 2). The screen 30 is disposed in parallel to the both rectifying plates 21 and 22. Further, the screen 30 is offset to the rear side (the “back side” in the claims) with respect to the rectifying plate 22 on the rear side.
In addition, the screen 30 is arrange | positioned in the position away from the track | orbit (railway) of the material 3 so that the material 3 which flowed down from the lower side opening part 20b of the rectification | straightening part 20 may not contact the front surface 30a of the screen 30. .

  The illumination unit 40 is a light source (light) that illuminates the front surface 30 a of the screen 30, and is configured to irradiate the front surface 30 a with light from a gap formed between the rear rectifying plate 22 and the screen 30. . That is, the illumination unit 40 is disposed on the rear side of the material 3 that passes through the space on the front side of the screen 30.

  The hopper 80 accommodates the material 3 that has passed through the space on the front side of the screen 30. The upper opening of the hopper 80 is disposed below the screen 30.

  The photographing unit 50 is a camera that photographs the material 3 passing through the space on the front side (the “front side” in the claims) of the screen 30 from the front side and outputs the photographing result to the calculating unit 60 described later. The photographing unit 50 is set to photograph the material 3 flowing down vertically from the horizontal direction. That is, the imaging surface of the imaging device of the imaging unit 50 is disposed on a plane parallel to the vertical direction. Note that the photographing unit 50 is preferably a video camera or a digital camera that can acquire a digital image.

  The calculation unit 60 is a computer including input means, output means, CPU, ROM, RAM, and the like. The calculation unit 60 acquires an image of the photographing unit 50 and calculates the particle size distribution of the material 3 based on the image.

Here, the calculation method of the particle size distribution by the calculation unit 60 will be described.
The photographing unit 50 photographs the material 3 flowing from the upstream side toward the downstream side with the front surface 30a of the screen 30 as the background. Then, the calculation unit 60 binarizes the photographing result to calculate the size of the material 3.

  In the image capturing device 2 </ b> A of the first embodiment, the front surface 30 a of the screen 30 is illuminated by the illumination unit 40 on the rear side of the material 3 that passes through the space on the front side of the screen 30. Therefore, only the front surface 30a of the screen 30 becomes bright, and the material 3 is photographed as a black shadow. Thereby, even when the material 3 has a pattern, the outer shape of the material 3 can be clearly recognized on the image.

  In addition, since the material 3 that has passed through the rectifying unit 20 passes through a position away from the screen 30, the front surface 30 a of the screen 30 can be prevented from being contaminated by the material 3. As a result, when the photographing unit 50 photographs the material 3, the screen 30 is not smudged, so that the material 3 on the image can be accurately recognized.

  Further, the material 3 flowing down from the rectifying unit 20 flows down vertically in parallel with the imaging surface of the imaging element of the imaging unit 50, and the distance from the imaging surface to each material 3 in the imaging region is constant. Therefore, the size of the material 3 can be accurately measured on the image.

In the image capturing apparatus 2A of the particle size distribution measuring system 1 as described above, as shown in FIG. 1, the material 3 that has flowed into the rectifying unit 20 flows down vertically along the front and rear rectifying plates 21 and 22. Further, the material 3 contacts the three rotating pins 25 and is effectively diffused. Thereby, each material 3 flows down in a rectified state without overlapping.
And since the rectified material 3 is image | photographed by the imaging | photography part 50 in the front side of the screen 30, the precision of the particle size distribution measurement performed based on the image of the material 3 can be improved.

Further, when the material 3 is allowed to flow into the rectifying unit 20, the rotation pin 25 is rotated around the axis by the driving device 26. In this way, even when the material 3 adheres to the upper side of the rotary pin 25, the material 3 moves to the lower side of the rotary pin 25 as the rotary pin 25 rotates, so that the material 3 is peeled off from the rotary pin 25. . Further, the material 3 attached to the rotary pin 25 is peeled off from the rotary pin 25 by the centrifugal force generated by the rotation of the rotary pin 25. Thereby, the material 3 adhering to the rotating pin 25 can be reliably dropped.
Therefore, in the image capturing device 2A, since the lump of the material 3 does not easily adhere to the rotating pin 25, the material 3 can be smoothly flowed down to the rectifying unit 20 having the rotating pin 25 to rectify the material 3.

  Note that, when the material 3 is allowed to flow into the rectifying unit 20, the rotating pin 25 may be always rotated, but the rotating pin 25 may be intermittently rotated. Further, the rotating pin 25 may be rotated when the material 3 adheres to the rotating pin 25.

As mentioned above, although 1st embodiment of this invention was described, this invention is not limited to said 1st embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the first embodiment, the three rotation pins 25 are provided, but the number and arrangement of the rotation pins are not limited. Further, the thickness of the rotary pin 25 and the shape of the axial cross section are not limited. The configuration of the rotating pin 25 is appropriately set according to the size, viscosity, etc. of the material 3.

  Further, in the image capturing device 2A of the first embodiment, the front and rear rectifying plates 21 and 22 are arranged vertically, but the upper portions of the front and rear rectifying plates 21 and 22 are arranged rearward with respect to the lower portion. The material 3 may be inclined so that the material 3 slides down the front surface 22a of the rear rectifying plate 22.

  In the image photographing apparatus 2A of the first embodiment, the front and rear two current plates 21 and 22 are provided, but only the rear current plate 22 is provided, and the material 3 is the front surface of the rear current plate 22. You may comprise so that it may flow down along 22a.

  Further, in the image capturing device 2A of the first embodiment, the driving device 26 is attached to the rear surface 22c of the rear rectifying plate 22, but the driving device 26 may be attached to the front surface 21c of the front rectifying plate 21. . In this case, the output shaft of the driving device 26 is connected to the front end portion 25a of the rotary pin 25.

  Moreover, although the drive device 26 of 1st embodiment is an electric motor, the structure of the drive device 26 is not limited. Further, the plurality of rotation pins 25 may be rotated by one drive device 26 by connecting one drive device 26 and the plurality of rotation pins 25 by a drive transmission mechanism such as a belt mechanism.

[Second Embodiment]
Next, the image capturing device 2B of the second embodiment will be described.
As shown in FIG. 3, the image capturing device 2 </ b> B of the second embodiment has substantially the same configuration as the image capturing device 2 </ b> A (see FIG. 1) of the first embodiment, and does not include the driving device 26. Is different.

In the rectifying unit 20 of the image capturing device 2B of the second embodiment, the front end portion 25a of the rotation pin 25 is inserted into a mounting hole 21b formed in the front rectifying plate 21 and provided on the front surface 21c of the front rectifying plate 21. Is supported by a fixed bearing.
Further, the rear end portion 25 b of the rotary pin 25 is inserted into a mounting hole 22 b formed in the rear rectifying plate 22 and is pivotally supported by a bearing provided on the rear surface 22 c of the rear rectifying plate 22.
The front end portion 25a and the rear end portion 25b of the rotation pin 25 are attached to the front and rear rectifying plates 21 and 22 so as to be rotatable about the axis.

  In the rectifying unit 20 of the second embodiment, when the material 3 adheres to the upper side of the rotation pin 25, the rotation pin 25 is pivoted due to the weight of the material 3 or an impact when the material 3 collides with the rotation pin 25. The material 3 is peeled off from the lower side of the rotating pin 25.

  The configuration of the rectifying unit 20 can be simplified in the configuration in which the rotation pin 25 is freely rotated as in the image capturing device 2B of the second embodiment.

As mentioned above, although 2nd embodiment of this invention was described, this invention is not limited to said 2nd embodiment, It can change suitably in the range which does not deviate from the meaning similarly to said 1st embodiment. It is.
For example, in the rectifying unit 20 of the second embodiment, a blade may be provided on the outer peripheral surface of the rotating pin 25, and the rotating pin 25 may be rotated by the material 3 flowing down contacting the blade.

1 Particle Size Distribution Measurement System 2A Image Capture Device (First Embodiment)
2B image capturing device (second embodiment)
DESCRIPTION OF SYMBOLS 3 Material 10 Belt conveyor 20 Rectification part 20a Upper side opening part 20b Lower side opening part 21 Front side rectification board 22 Rear side rectification board 23 Side wall 25 Rotating pin 26 Drive apparatus 30 Screen 40 Illumination part 50 Shooting part 60 Calculation part 80 Hopper

Claims (3)

A rectifying plate from which material flows down from the upstream side toward the downstream side;
A screen provided on the downstream side of the rectifying plate and offset to the back side with respect to the rectifying plate;
A photographing unit that photographs the material passing through the space on the front side of the screen,
A rotation pin is erected on the surface of the current plate,
The rotating pin is attached to the rectifying plate so as to be rotatable about an axis, and an image photographing device for measuring particle size distribution. An image capturing apparatus for measuring particle size distribution according to claim 1,
An image photographing apparatus for measuring a particle size distribution, wherein a plurality of the rotating pins are erected on a surface of the current plate. An image capturing apparatus for measuring a particle size distribution according to claim 1 or 2,
An image photographing apparatus for measuring a particle size distribution, wherein a driving device for rotating the rotating pin around an axis is provided.

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