JP4255190B2 - Powder sampling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a powder sampling device that collects a part of a powder as a sample from a powder flow space in which the powder flows.
[0002]
[Prior art]
Of granular material flowing in the granular material flow space, such as granular material in a fluid tank in a granular material manufacturing apparatus for manufacturing granular material such as seasonings, and granular material in an air transport duct. When measuring the moisture content and the like by an optical measuring means, it is necessary to collect a part of the powder as a sample from the powder flow space and transfer it to the measurement position.
As such a granular material sampling apparatus, there is an apparatus disclosed in Japanese Patent Publication No. 53-8508. The apparatus includes a sampling chamber that communicates with the granular material flow space and is formed outside the granular material passage, and a rotating disk that partially protrudes into the granular material passage is provided in the sampling chamber. Yes.
[0003]
At the time of sampling, the granular material deposited on the rotating disk is moved to the measurement position provided outside the granular material passage by the rotation of the rotating disk. At the measurement position, a transparent window is formed on the upper wall of the sampling chamber, and the sample is optically measured through the transparent window. In the middle of the movement path from the sampling position in the powder passage to the measurement position outside the powder passage, the surface of the powder layer deposited on the rotating disk is smoothed to ensure measurement accuracy. In order to make the thickness of the granular material layer constant, a sieve plate is provided, and the distance between the transparent window and the granular material surface is made constant. In addition, a scraping plate is provided in the moving path from the measurement position to the sampling position to scrape the sample that has been measured from the rotating disk, and the bottom plate of the sampling chamber is directed toward the powder channel. The sample which is inclined and scraped off from the rotating disk is returned to the powder passage along the inclined surface.
[0004]
[Problems to be solved by the invention]
In the above granular material sampling device, the granular material flow space and the space in the sampling chamber communicate with each other, and therefore, pressure fluctuations in the granular material passage where air flow is intense reach the sampling chamber. For this reason, the sample surface that has been leveled once with the stir plate is disturbed due to pressure fluctuations, or powder particles have entered the space between the sample surface and the transparent window at the measurement position, or powder that has entered the sampling chamber. Particles may adhere to the transparent window, and the measurement accuracy may be reduced. In particular, when the measurement target is a lightweight powder, there is a high possibility of scattering due to the influence of pressure fluctuation.
Further, since a part of the rotating disk is always present in the powder passage, the flow of the powder in the powder passage must be prevented, and the rotating disk and its supporting member must have high strength. There was a problem that had to be done.
[0005]
Accordingly, the present invention can collect a sample so that optical measurement can be performed under stable measurement conditions by preventing the surface of the collected sample from being disturbed, and in the granular material flow space by the sample collecting means. It aims at providing the granular material sampling device which can reduce the flow change of a granular material.
[0006]
[Means for Solving the Problems]
The granular material sampling device of the present invention communicates with the granular material flow space through an opening formed in the wall surface of the granular material flow space through which the granular material flows, and is attached to the outside of the wall surface. The cover and the tip can be accommodated in the cover so that the tip does not protrude into the powder flow space, and the state accommodated in the cover and the state where the tip side protrudes into the powder flow space can be taken. A sampling body that is slidably supported in close contact with the cover, and a drive unit that linearly reciprocates the sampling body along the cover are provided. At the front end side of the sampling body, for the discharge of the granular material, the opening for receiving the granular material and the rear side of the opening for introducing the granular material on the opposite side of the opening for introducing the granular material A through hole communicating with the opening is formed, the cover is formed with an optical measurement window at a position where the opening for introducing the granular material comes, and the driving means has the opening for introducing the granular material A sampling position in the powder particle flow space where the particle discharge opening is in the cover, and a discharge position in which both the particle particle introduction opening and the powder particle discharge opening are in the particle flow space; The sampling body is moved so as to position the sampling body at at least three positions of the measurement position where the opening for introducing the granular material comes to the position of the optical measurement window.
Here, the front end of the sampling body refers to the end on the granular material flow space side, and the rear end refers to the opposite end.
[0007]
At the time of sample collection, the sampling body is positioned at the sampling position where the particle introduction opening is in the particle flow space and the particle discharge opening is in the cover, and from the particle introduction opening into the through hole Powder particles are introduced. At this time, the granular material discharge opening is closed by the inner wall of the cover, and the granular material accumulates in the through hole. The sample is collected until the granular material rises on the granular material introduction opening.
[0008]
At the time of sample measurement, the sampling body is moved from the collection position to the rear end side, and positioned at the measurement position where the opening for introducing the granular material comes to the position of the optical measurement window. An excessive amount of powder particles raised on the powder particle introduction opening is removed by the end face of the cover when the sampling body is retracted, and is stirred along the surface of the sampling body.
After completion of the measurement, the sampling body is moved from the measurement position to the front end side, and the powder particle introduction opening and the particle discharge opening are both positioned at the discharge position in the powder flow space. As a result, the powder discharge opening is opened, and the sample in the through hole after the measurement is returned to the powder flow space from the powder discharge opening.
[0009]
In the present invention, the sampling body needs to protrude into the powder body flow space at the collection position and the discharge position, but at other positions, the sampling body can be stored in the cover. It can suppress that it protrudes in a body flow space and changes the flow of a granular material.
Since the sampling main body only moves linearly, it can be easily slid while being in close contact with the cover. And by making it a close_contact | adherence state, the pressure fluctuation in a granular material flow space does not reach the extract | collected sample, but can perform an optical measurement on the stable measurement conditions.
The fact that the sampling body only moves linearly is also advantageous in that it does not require a large mechanical strength because the mechanism can be made simple and lightweight.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The measurement position is preferably in a state where the sampling body is housed in the cover. Thereby, during a measurement, a sampling main body does not protrude in a granular material flow space, and it can suppress changing the flow of a granular material.
The sampling body is preferably provided with at least one calibration material. The calibration material is, for example, a zero calibration sample for calibrating a measurement object, for example, a state where moisture is zero. Furthermore, a calibration sample for span calibration indicating that the measurement target is a reference value may be included. The calibration material is also positioned by the driving means at the position of the optical measurement window or the position of the separately provided calibration optical measurement window.
[0011]
The position for arranging the calibration material is, for example, the rear end side of the opening for introducing the granular material, and can be arranged on the surface positioned at the position of the optical measurement window for sample measurement. Thereby, the optical measurement window for sample measurement can be used for both sample measurement and calibration.
At this time, the position where the calibration material is positioned at the position of the optical measurement window is preferably the sampling position or the discharge position. As a result, calibration can be performed at the time of sample collection or discharge, and the entire measurement time can be shortened.
[0012]
It is preferable that an extendable shielding member that shields the powder particle flow space from the outside is provided between the sampling body and the cover. Thereby, it can suppress more effectively that the pressure fluctuation in a granular material flow space reaches the extract | collected sample, and can stabilize measurement conditions more. Since the sampling body only moves linearly, it is easy to provide such a shielding member.
[0013]
【Example】
1A and 1B are schematic configuration diagrams showing a sampling body and driving means constituting one embodiment, wherein FIG. 1A is a top view, FIG. 1B is a front view, and FIG. 1C is a side view. However, this invention is not limited to the Example shown below, A various change can be made within the range of the summary of this invention described in the claim.
A through hole 3 that is inclined from the front end 1a toward the rear end 1b side is formed on the front end 1a side of the cylindrical sampling body 1. The through-hole 3 has a powder particle introduction opening 3a formed on the upper surface side of the sampling body 1 and a powder particle formed on the lower surface side of the sampling body 1 at a position closer to the rear end 1b than the introduction opening 3a. The body discharge opening 3b communicates. The introduction opening 3a and the discharge opening 3b are formed at positions separated from each other so that positions on the respective planes do not overlap each other.
[0014]
A zero calibration material 5 is provided on the upper surface of the sampling body 1 on the rear end 1b side of the introduction opening 3a with a predetermined distance from the introduction opening 3a. In this embodiment, the zero calibration material 5 is arranged so that the position on the plane substantially coincides with the discharge opening 3b. A span calibration material 7 is provided on the upper surface of the sampling body 1 on the rear end 1b side of the zero calibration material 5.
A linear motion motor 11 that linearly reciprocates the sampling body 1 in the central axis direction is connected to the end face of the rear end 1b of the sampling body 1 via a shaft 9.
[0015]
FIG. 2 is a partial cross-sectional configuration diagram showing a specific configuration and an operation of the embodiment shown in FIG. 1 attached to an apparatus in which the granular material flows, and (A) is at the time of sampling, (B) is At the time of sample measurement, (C) shows the time of sample discharge.
A cylindrical cover 15a attached to the outside of the wall surface 13 is attached to communicate with the powder particle flow space through an opening formed in the wall surface 13 partitioning the powder particle flow space from which the powder material flows. It has been. The sampling body 1 can be stored in the cover 15a so that the tip does not protrude into the powder flow space, so that the state stored in the cover 15a and the state where the tip side protrudes into the powder flow space can be taken. The cover 15a is slidably supported in close contact with the cover 15a. The powder particles flow from the top to the bottom as indicated by the arrows. The sampling body 1 is arranged with the upper surface side (introduction opening 3a side) on the upper side and the lower surface side (discharge opening 3b side) on the lower side, and the tip 1a side of the sampling body 1 is in the powder flow space. When protruding, the powder particles fall on the upper surface side of the sampling body 1a.
[0016]
In FIG. 2, the cover 15 a is drawn so that there is a clear gap between the cover 15 a and the peripheral surface of the sampling body 1, but in actuality, the cover 15 a has a structure that slides closely.
Between the rear end of the cover 15a and the rear end 1b of the sampling body 1, there is provided a cylindrical bellows member 15b as a shielding member that expands and contracts in the central axis direction. The front end of the bellows member 15b is fixed to the opening at the rear end of the cover 15a, and the rear end of the bellows member 15b is fixed to the peripheral portion of the end surface of the rear end 1b of the sampling body 1, so Are prevented from communicating via a slight gap between the cover 15a and the sampling body 1.
On the upper surface of the cover 15a, a transparent glass window 17 for optical measurement is formed on the wall surface 13 side. Above the glass window 17, an optical fiber 19 connected to the optical measuring device is arranged.
[0017]
At the time of sampling, as shown in FIG. 2 (A), the sampling body 1 is moved to the granular material flow space side by the linear motor 11, and the introduction opening 3a is in the granular material flow space and the discharge opening. 3b is stopped at the sampling position in the cover 15a. That is, the sampling position is a state in which the introduction opening 3a is opened in the granular material flow space and the discharge opening 3b is closed in close contact with the inner wall of the cover 15a. Samples are collected until the granular material is introduced into the through-hole 3 from the introduction opening 3a, accumulated in the through-hole 3, and the granular material rises on the introduction opening 3a. At this time, the zero calibration material 5 is located at the position of the glass window 17, and the zero calibration of the optical measuring device can be performed simultaneously with the sampling.
[0018]
At the time of sample measurement, as shown in FIG. 2B, the sampling main body 1 is moved from the collection position to the rear end side, and stopped at the measurement position where the introduction opening 3a comes to the position of the glass window 17. At this time, the sampling body 1 is housed in the cover 15a, and the tip 1a is retracted to the position of the wall surface 13 and does not hinder the flow of the powder in the powder flow space.
[0019]
When the sampling body is moved, an excessive amount of powder particles that have risen on the introduction opening 3 a are removed by the end face of the cover 15 a and stirred along the side surface of the sampling body 1. Since the sample in the through hole 3 is isolated from the powder flow space, the sample does not flow out or scatter, and the sample surface is not disturbed. Measurements can be made. And the moisture content etc. of the granular material extract | collected in the through-hole 3 as a sample through the glass window 17 and the optical fiber 19 are measured.
[0020]
After the measurement is completed, the sampling body 1 is moved from the measurement position to the distal end side, and stopped at the discharge position where both the introduction opening 3a and the discharge opening 3b are in the powder flow space. Thereby, the discharge opening 3b is opened, and the sample in the through hole 3 after the measurement is returned from the discharge opening 3b to the granular material flow space. At this time, the span calibration material 7 comes to the position of the glass window 17, and the span calibration of the optical measuring device can be performed simultaneously with the discharge of the sample.
The positions of the introduction opening 3a, the discharge opening 3b, the zero calibration material 5, the span calibration material 7, the glass window 17 and the optical fiber 19 are set so as to take the respective states shown in FIG.
[0021]
In this embodiment, the cylindrical sampling body 1 is used. However, the shape of the sampling body is not limited to this, and a sampling body having another shape such as a prismatic shape may be used.
Further, the zero calibration material 5 and the span calibration material 7 are provided on the introduction opening 3a side in order to share the glass window 17 and the optical fiber 19 for sample measurement. However, the present invention is not limited to this. It may be provided on a surface different from the surface on which the introduction opening 3a is provided, for example, on the side surface or the opposite surface. In that case, a transparent glass window and an optical fiber are separately required for zero calibration and span calibration. In this case, in this embodiment, the zero calibration material 5 is placed in the powder flow space when the sample is discharged. It is possible to prevent exposure and contact with the granular material.
Further, although the zero calibration material 5 and the span calibration material 7 are provided as the calibration materials, the present invention is not limited to this, and only the zero calibration material 5 or only the span calibration material 7 is provided. You may make it prepare.
[0022]
【The invention's effect】
In the granular material sampling device of the present invention, the granular material introduction opening located on the side receiving the granular material on the tip side on the granular material flow space side and the granular material on the opposite side of the opening for introducing the granular material The sampling body in which a through hole formed by communicating with the opening for discharging the granular material located on the rear end side from the opening for introduction is formed in a cylindrical cover attached to the wall surface of the granular material flow space. Samples are placed so that they can reciprocate linearly in close contact in the direction of entering and exiting the powder flow space, the powder introduction opening is in the powder flow space, and the powder discharge opening is in the cover. At least three of the position, the discharge position where both the particle introduction opening and the powder discharge opening are in the powder flow space, and the measurement position where the powder introduction opening comes to the position of the optical measurement window Move the sampling body to position the sampling body in one position Therefore, it is possible to collect the sample so that optical measurement can be performed under stable measurement conditions by preventing the sample from flowing out or scattering, making the sample surface constant, and the granular material by the sample collection means It is possible to reduce the flow change of the powder and granular material in the flow space. Further, since the sampling body only moves linearly, the mechanism can be simplified and lightened.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a sampling body and driving means constituting one embodiment, (A) is a top view, (B) is a front view, and (C) is a side view.
FIG. 2 is a cross-sectional view showing a specific configuration attached to the apparatus in which the granular material flows and its operation, in which (A) is at the time of sample collection, (B) is at the time of sample measurement, C) shows the time of sample discharge.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sampling main body 1a The front-end | tip 1b of a sampling main body The rear end 3 of a sampling main body 3a Through-hole 3a Opening 3b for granular material discharge | emission 5 Wall surface 15a for body flow space section Cover 15b Bellows member 17 Transparent glass window 19 Optical fiber

Claims (6)

A cylindrical cover attached to the outside of the wall through the opening formed in the wall of the powder flow space through which the powder flows, the tip of which is attached to the outside of the wall The cover can be stored in the cover without protruding into the space, and slides in close contact with the cover so that the state stored in the cover and the state where the tip side protrudes into the powder flow space can be taken. A sampling body supported in a possible manner, and drive means for linearly reciprocating the sampling body along the cover;
At the front end side of the sampling body, there is an opening for receiving the granular material, and the discharge of the granular material positioned on the opposite side of the opening for introducing the granular material and at the rear end side from the opening for introducing the granular material. A through hole is formed that communicates with the opening for use.
The cover is formed with an optical measurement window at a position where the opening for introducing the granular material comes.
The drive means includes a sampling position in which the particulate introduction opening is in the particulate flow space and the particulate discharge opening is in the cover, the particulate introduction opening, and the powder The sampling body is positioned at at least three positions: a discharge position where both the particle discharge openings are in the particle flow space and a measurement position where the particle introduction opening is located at the position of the optical measurement window. The granular material sampling device which moves the said sampling main body so that it may. The granular material sampling apparatus according to claim 1, wherein the measurement position is a state in which the sampling body is housed in the cover. The sampling body is provided with at least one calibration material, and the calibration material is also positioned by the driving means at the position of the optical measurement window or the position of the separately provided calibration optical measurement window. The granular material sampling device according to claim 1 or 2. 4. The powder according to claim 3, wherein the calibration material is located on a rear end side of the powder particle introduction opening and is disposed on a surface positioned at the position of the optical measurement window for sample measurement. Body sampling device. The granular material sampling device according to claim 3 or 4, wherein the position at which the calibration material is positioned at the position of the optical measurement window is the sampling position or the discharge position. The granular material sampling apparatus according to any one of claims 1 to 5, wherein a stretchable shielding member that shields the granular material flow space from the outside is provided between the sampling body and the cover.

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