JP2014235027A - Powder physical property-measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder physical property-measuring device capable of measuring physical property of an angle of repose of a sample powder and the like by a simple method.SOLUTION: A powder physical property-measuring device includes: a container 10 having a bottomed cylindrical shape for storing a powder with one end thereof opened; and a lid body 20 detachably attached to the container 10. The lid body 20 is made of a transparent material. A peripheral edge thereof is attached with an angle scale 23, and a central part thereof is turnably attached with a pointer 24 indicating the vertical direction. The container 10 is filled with the sample powder with the lid body 20 closed, and a top surface of the sample powder is adjusted to be horizontal in a state in which an angle of the pointer 24 is 0°, and after that, an angle of repose of the sample powder can be obtained by reading the angle of the pointer when the container 10 is turned and the top surface of the sample powder is tilted to start collapsing.

Description

  The present invention relates to a powder physical property measuring apparatus for measuring physical properties such as an angle of repose of a sample powder.

  When performing bulk handling such as storage and transportation of powder, it is necessary to grasp powder physical properties such as repose angle, bulk density, and particle diameter.

  The angle of repose, which is one of the powder physical properties, is the maximum value of the angle formed by the surface of the deposited powder and the horizontal plane when the powder is deposited. The angle of repose shows the same value when conditions such as powder type and moisture content are made equal. It can be said that the smaller the angle of repose, the higher the fluidity of the powder.

  One of the methods for measuring the angle of repose is a measurement method by a tilt method. In the tilt method, powder is poured into a cylindrical container, the cylindrical container is slowly tilted in the circumferential direction, and when the surface slips, the angle formed by the horizontal plane and the plane formed by the powder is the rest. Measure as a corner.

  In the measurement of the angle of repose by the tilt method, for example, as described in Patent Document 1, the state of powder in a container is photographed by a photographing device such as a camera, and a horizontal plane and powder are formed from the photographed image. This is done by measuring the angle with the plane.

  However, many repose angle measuring devices are large-scale, and there is a problem that the device cost increases.

JP 62-180747 A

  An object of the present invention is to provide a powder physical property measuring apparatus capable of measuring a powder physical property such as an angle of repose of a sample powder by a simple method.

  The powder physical property measuring apparatus of the present invention includes a bottomed cylindrical container having one end opened for containing powder, and a lid that is detachably attached to the container, and the lid is made of a transparent material. The peripheral edge is provided with an angle scale, and a pointer indicating the vertical direction is rotatably attached to the center. The container is filled with sample powder, the lid is closed, and the pointer The angle of the pointer is adjusted so that the upper surface of the sample powder is horizontal, and then the angle of the pointer when the upper surface of the sample powder starts to tilt and collapse is read by rotating the container. Thus, the angle of repose of the sample powder is obtained.

  According to the powder physical property measuring apparatus of the present invention, the lid is made of a transparent material, the peripheral edge thereof is provided with an angle scale, and a pointer that indicates the vertical direction is rotatably attached to the center. Therefore, after filling the container with the sample powder, closing the lid, and adjusting the upper surface of the sample powder to be horizontal with the angle of the pointer being 0 °, the container is rotated and the sample powder is rotated. The angle of repose of the sample powder can be measured by reading the angle of the pointer when the upper surface of the glass begins to tilt and collapse. Thus, the angle of repose of the powder can be easily and easily measured without requiring a particularly complicated device.

  In the powder physical property measuring apparatus of the present invention, the container also serves as a container for measuring bulk density, and includes a chart for determining the bulk density from the weight measured by filling the container with sample powder in a ground state. Preferably it is. According to this aspect, the bulk density of the sample powder can be easily obtained by filling the container with the sample powder in a ground state, measuring its weight, and comparing the weight with the chart.

  In the powder physical property measuring apparatus of the present invention, the lid body has a double wall structure made of a transparent material, and the double wall structure has an internal space sealed against the outside. It is preferable that they are arranged in the internal space. According to this aspect, damage to the pointer can be prevented.

  In the powder physical property measurement apparatus of the present invention, the lid and the container are hermetically sealed at a contact portion of the lid with the container or a contact portion of the container with the lid. It is preferable that an elastic seal member is disposed. According to this aspect, the lid and the container can be sealed in an airtight manner, troubles such as leakage of the sample powder filled in the container during measurement of the angle of repose can be prevented, and durability can be improved.

  In the powder property measuring apparatus of the present invention, it is preferable that an annular rib is provided on the periphery of the bottom wall of the container. According to this aspect, the bottom wall is raised by the annular rib, and the surface is less likely to be damaged. For this reason, when a container consists of resin material which has transparency, transparency can be maintained over a long term.

  The powder physical property measuring apparatus of the present invention further includes a scraping plate for filling the container with the sample powder to make a ground state, and a scale for measuring the weight of the container filled with the sample powder. Preferably it is. According to this aspect, the angle of repose and the bulk density can be measured without requiring other equipment.

  The powder property measuring apparatus of the present invention preferably further includes a microscope for measuring the particle size of the sample powder. According to this aspect, since the particle diameter of the sample powder can be measured with a microscope, almost all of the powder physical properties necessary for setting conditions such as storage and transportation of the powder can be measured by this powder physical property measuring apparatus. It becomes possible to measure.

  According to the powder physical property measuring apparatus of the present invention, the container is filled with the sample powder, the lid is closed, and the top surface of the sample powder is adjusted to be horizontal with the pointer angle being 0 °, The angle of repose of the sample powder can be measured by rotating the container and reading the angle of the pointer when the upper surface of the sample powder begins to tilt and collapse.

1 is a schematic view of a powder property measuring apparatus of the present invention. It is an exploded sectional view of the powder physical property measuring apparatus of the present invention. It is explanatory drawing which shows the measuring method of the angle of repose using the powder physical property measuring apparatus of FIG. It is explanatory drawing which shows the measuring method of bulk density. It is explanatory drawing of the chart used in order to measure a bulk density from the weight of sample powder. It is explanatory drawing which shows an example of the physical property measuring apparatus of this invention.

  As shown in FIGS. 1 and 2, the powder physical property measuring apparatus of the present invention has a repose angle measuring instrument including a bottomed cylindrical container 10 having an open end and a lid 20 that is detachably attached to the container 10. 1 is provided.

  The material of the container 10 is not particularly limited, and for example, resin materials such as acrylic resin, polyethylene, vinyl chloride, polyacetal, polyamide, and polycarbonate are preferably used. By configuring the container 10 with a resin material, the container 10 can be reduced in weight. However, the container 10 may be made of metal, glass, or the like. The container 10 is not necessarily transparent, but is preferably made of a transparent resin material because the behavior of the powder sample filled therein can be easily observed.

  Referring also to FIG. 2, an annular rib 12 is provided on the periphery of the bottom wall 11 of the container 10. As a result, the bottom wall 11 becomes a raised bottom, and the surface is less likely to be scratched. Therefore, when the container 10 is made of a resin material having transparency, the transparency can be maintained for a long time.

  The lid 20 has a double wall structure composed of an outer wall 21 and an inner wall 22.

  The outer wall 21 and the inner wall 22 are formed of a transparent resin material such as acrylic resin, polyethylene, vinyl chloride, polyamide, or polycarbonate, or a transparent material such as glass.

  An angle scale 23 is attached to the inner peripheral edge of the inner wall 22. The angle scale 23 may be directly printed on the inner peripheral edge of the inner wall 22, or a sheet material or the like on which the angle scale 23 is printed may be attached. In addition, a pointer 24 that indicates the vertical direction is rotatably attached to the inner center of the inner wall 22. That is, the angle scale 23 and the pointer 24 are arranged in a space 25 sealed from the outside by the outer wall 21 and the inner wall 22. In this embodiment, the pointer 24 is always directed downward in the vertical direction. However, by attaching a weight or the like to the base side of the pointer 24, the pointer 24 may be directed upward in the vertical direction. . In that case, it goes without saying that the angle scale 23 is at the top during measurement.

  On the outside of the inner wall 22, a fitting portion 26 is formed that fits into the opening 15 of the container 10 so as to be detachable. The fitting portion 26 is formed with an annular concave groove, and an annular elastic seal member 27 is disposed in the concave groove. When the fitting part 26 of the lid 20 is inserted into the opening 15 of the container 10, the elastic seal member 27 is crushed between the fitting part 26 of the lid 20 and the inner wall of the container 10, and the lid 20 and the container 10 are hermetically sealed. Although the material of the elastic seal member 27 is not particularly limited, for example, silicon rubber, urethane rubber, natural rubber, or the like is preferably employed.

  In this embodiment, the elastic seal member 27 is disposed in the fitting portion 26 which is a contact portion of the lid 20 with the container. However, the elastic seal member 27 is disposed at the contact portion of the container 10 with the lid. Member 27 may be arranged.

  Next, a method for measuring the angle of repose of the sample powder using the angle of repose measuring instrument 1 shown in FIG. 1 will be described.

  First, the lid 20 is removed from the container 10 and filled with sample powder of about 1/3 to 1/2 of the internal volume of the container 10. After filling the sample powder, the lid 20 is closed, and the upper surface of the sample powder is horizontal by tapping, shaking, etc. with the pointer 24 provided on the lid 20 pointing to 0 ° of the angle scale 23. Adjust so that Then, as shown in FIG. 3, the container 10 is slowly rotated, and the angle indicated by the pointer 24 when the upper surface 30 of the sample powder 31 starts to tilt and collapse is read. In this way, the angle of repose of the sample powder can be measured.

  In this embodiment, since the angle scale 23 and the pointer 24 are disposed in a sealed space 25 surrounded by the outer wall 21 and the inner wall 22 of the lid body 20, Damage to the scale 23 and the pointer 24 can be prevented.

  Moreover, since the annular rib 12 is provided in the periphery of the bottom wall 11 of the container 10, it is possible to prevent the bottom wall 11 from being scratched.

  In addition, the container 10 of the angle of repose measuring instrument 1 also functions as a container for measuring bulk density. As shown in FIG. 4, the bulk density can be obtained from the weight measured by supplying the sample powder 31 to the container 10 and grinding it using a grinding plate 32 or the like.

  The measurement of the bulk density can be calculated from the following equation (1), where V is the internal volume of the container 10 and W is the weight of the sample powder filled in the container 10.

Bulk density ρ = W / V (1)
The weight of the sample powder filled in the container 10 can be obtained by dividing the weight of the container 10 (wind body weight) from the weight of the container 10 filled with the sample powder.

  Further, since the internal volume of the container 10 is a fixed value, for example, by preparing a chart showing the relationship between the bulk density and the weight of the sample powder as shown in FIG. Thus, the bulk density can be obtained from the weight of the sample powder. In this embodiment, the horizontal axis below the chart shows the weight of only the sample minus the weight of the container 10, but the horizontal axis shows the weight including the weight of the container 10. Also good.

  FIG. 6 shows a further preferred example 2 of the powder physical property measuring apparatus of the present invention. In this embodiment, the container 10 and the lid 20 constituting the angle of repose measuring instrument 1, and a chart for obtaining the bulk density from the weight measured by filling the container 10 with the sample powder in a worn state (not shown in FIG. 6). In addition to this, a grinding plate 32 for filling the container 10 with the sample powder and putting it into a ground state, a scale 40 for measuring the weight of the container 10 filled with the sample powder, and a particle diameter of the sample powder are measured. A microscope 50 is provided.

  The scale 40 is preferably a scale that can display a zero point by placing an empty container 10 and setting the state to zero, but a normal scale may also be used. Since the microscope 50 can be a known one already on the market, its detailed description will be omitted.

  According to this powder physical property measuring apparatus, the angle of repose can be measured by the angle of repose measuring instrument 1, the bulk density can be measured by the container 10 of the angle of repose measuring instrument 1, the grinding plate 32, and the balance 40, Since the particle size of the sample powder can be measured with the microscope 50, it is possible to measure almost all of the powder physical properties necessary for setting conditions such as storage and transportation of the powder with this powder physical property measuring device. It becomes.

1: Repose angle measuring instrument 10: Container 11: Bottom wall 12: Leg 15: Opening 20: Lid 21: Outer wall 22: Inner wall 23: Angle scale 24: Pointer 25: Space 26: Fitting portion 27: Elastic seal Member 32: Ground plate 40: Scale 50: Microscope

Claims (7)

A bottomed cylindrical container containing one end and containing a powder; and a lid body detachably attached to the container;
The lid body is made of a transparent material, an angular scale is attached to the periphery, and a pointer that indicates the vertical direction is rotatably attached to the center.
The container is filled with sample powder, the lid is closed, and the upper surface of the sample powder is adjusted to be horizontal with the pointer angle being 0 °, and then the container is rotated to rotate the sample. An apparatus for measuring powder physical properties, characterized in that an angle of repose of the sample powder is obtained by reading an angle of the pointer when the upper surface of the powder starts to tilt and collapse.   2. The powder physical property measurement according to claim 1, wherein the container also serves as a container for measuring a bulk density, and includes a chart for obtaining a bulk density from a weight measured by filling the container with a sample powder in a ground state. apparatus.   The lid has a double wall structure made of a transparent material, an internal space sealed from the outside is formed between the double wall structures, and the pointer is disposed in the internal space. Item 3. A powder property measuring apparatus according to Item 1 or 2.   An elastic seal member that hermetically seals the lid and the container is disposed at a contact portion of the lid with the container or a contact portion of the container with the lid. The powder physical property measuring apparatus according to any one of 1 to 3.   The powder physical property measuring apparatus according to any one of claims 1 to 4, wherein an annular rib is provided on a peripheral edge of the bottom wall of the container.   The powder physical property measurement according to claim 2, further comprising: a scraping plate for filling the container with the sample powder to form a scraped state; and a scale for measuring the weight of the container filled with the sample powder. apparatus.   Furthermore, the powder physical property measuring apparatus of any one of Claims 1-6 provided with the microscope for measuring the particle size of the said sample powder.