JP2000146798A - Volume loss measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the bulk density of powder by equipping a cell that has a casing where the powder is filled and a filter that can be attached to or detached from the casing and deaerating the powder with a specific suction pressure for a specific amount of time via the filter. SOLUTION: A filter 8 is embedded to a step part 6a that is provided at the inner periphery of the lower portion of a casing 6, and is sandwiched by the casing 6 and a bottom plate 7 via an O ring 9 for mounting, thus preventing powder 10 in the casing 6 from being leaked to a lower portion from the surrounding when the powder is received by the filter 8. In this case, a volume where the powder of the casing 6 enters is set to 100 cc and a space S is provided at an entire lower portion so that suction can be made uniformly on the entire surface of the filter 8. An air hole 12c is fed through the center of a mount 12 and the powder 10 that is loaded into the cell A can be deaerated by sucking air toward the side of the body 1 through the air hole 12c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume reduction measuring device for measuring the degassing volume reduction characteristics of powder.

[0002]

2. Description of the Related Art Conventionally, there has been generally provided a volume reducer for reducing the volume by removing air from powder. Regarding this, as described in, for example, Japanese Patent Application Laid-Open No. 9-58870, a simple and reliable powder discharging mechanism has been disclosed by the present applicant. In addition, as shown in a cross-sectional view of FIG. 7 as an example, the internal air is sucked from an intake port 31a provided at the upper part of the outer periphery of the outer cylinder 31 extending to the left and right, and the powder inside the inner cylinder 32 is provided through an inner cylinder 32 provided as a filter. It has been proposed that the screw 33 be transported from the right to the left of the figure by rotating the screw 34 while the body 33 is being evacuated.

[0003]

However, as described above, many powder volume reduction devices generally use a vacuum pump or the like to deaerate air in the powder to reduce the volume of the powder. Therefore, the powder is easily affected by physical properties, particularly air permeability, and it is impossible to predict how much the volume can be reduced if the type of powder changes. Therefore, in order to know the volume reduction characteristics of the powder to be handled for the first time in the volume reduction machine, the device must be actually operated and confirmed by a test, which is wasteful labor.

[0004] In view of the above problems, the present invention reproduces the suction and deaeration mechanism of a powder volume reducer in a compact measuring device,
It is an object of the present invention to provide a volume reduction measuring device capable of predicting the volume reduction characteristics of the volume reduction machine with a simple method.

[0005]

In order to achieve the above object, according to the present invention, there is provided a cell having a casing filled with powder and a filter detachable from the casing. Then, the powder is deaerated at a predetermined suction pressure and a predetermined time, and the bulk density of the deaerated powder is measured.

[0006] The cell is provided with a mount for attaching the cell via an O-ring, and the airtightness between the mount and the cell is maintained by the suction force at the time of degassing.

Further, by providing a space on the suction side of the filter, the powder is uniformly degassed over the entire surface of the filter.

Further, the outer peripheral surface of the cell is a tapered surface,
The outer diameter of the mount is smaller than the outer diameter of the cell,
A bat for receiving the powder spilled from the cell is substantially fitted to the mount and provided.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of an embodiment of a volume reduction measuring apparatus according to the present invention, in which (a) is a front view and (b) is a right side view. As shown in the figure, an operation panel 1a having a slope is provided at the upper front corner of the substantially rectangular parallelepiped main body 1, and a vacuum indicating the suction pressure to the powder is provided on the operation panel 1a. A gauge 2, a timer 3 for arbitrarily setting a suction time, and a start button 4 are provided.

Further, a cell A for storing powder to be measured is attached near the center of the upper surface of the main body 1, and receives the powder spilled from the cell A so as to cover the entire upper surface of the main body 1 around the cell A. The bat 5 is arranged. In this cell A, the bulk density of the powder as a sample after volume reduction can be measured. In addition, a pneumatic device such as a vacuum pump (not shown) is provided inside the main body 1 and an air pipe is provided. Details will be described later.

FIG. 2 is a longitudinal sectional view showing a specific structure of the cell A. FIG. 2A shows the structure of the cell A itself, and FIG. 2B shows the structure of a mount on the main body side on which the cell A is installed. I have. 6A, reference numeral 6 denotes a substantially cylindrical casing having a tapered outer periphery, 7 denotes a substantially disk-shaped bottom plate attached to the lower end of the casing 6, 8 denotes a disk-shaped metal filter, 9 is an O-ring.

The filter 8 is fitted into a step 6a provided on the inner periphery of the lower part of the casing 6, and the casing 6 and the O
It is sandwiched and attached by the bottom plate 7 via the ring 9. Thereby, the powder 1 in the casing 6
When 0 is received by the filter 8, it does not leak below its surroundings. In this embodiment, the volume of the casing 6 in which the powder enters is set to 100 cc. Further, a space S is provided in the entire lower part of the filter 8 so that suction is performed evenly over the entire surface of the filter 8 as much as possible. The bottom plate 7 is fixed to the casing 6 by bolts 11 at several places around the bottom plate 7. In the figure, only the left bolt 11 is shown, and the right bolt is omitted.

In FIG. 1B, reference numeral 12 denotes the main body 1.
A substantially cylindrical mount 13 is provided on the upper surface of the mount 12, and an O-ring 13 is fitted in a ring groove 12a on the upper surface of the mount 12. An upwardly extending protrusion 12b is provided at the center of the upper surface of the mount 12, which fits into a hole 7a provided at the center of the bottom plate 7, and the O-ring 13 contacts the lower surface of the bottom plate 7, thereby lowering the bottom. The plate 7 is sealed with the mount 12. Thereby, the cell A is attached to the main body 1 side.

An air hole 12c penetrates the center of the mount 12, through which air is sucked toward the main body 1 to degas the powder 10 placed in the cell A. Details will be described later. In addition, as described above, the bat 5 that receives the powder spilled from the cell A is disposed so as to cover the entire upper surface of the main body 1 around the cell A.
At the center of the butt 5, a through-hole 5a is formed for substantially fitting with the mount 12. Note that the left and right portions of the main body 1 and the bat 5 and the lower part of the main body 1 in FIG.

FIG. 3 is a view showing an air flow for deaeration in the present embodiment. First, as shown in FIG.
The cylindrical member 14 is fitted to the upper end, the volume is raised, and the powder 10 is put into the cell A. This will be described later. Then, the mount 12 connected to the lower part of the cell A
Cell A by the vacuum pump 18 through the air hole 12c of
The air contained in the powder 10 inside is sucked and deaerated. A vacuum gauge 2, an air filter 16, and a valve 17 are provided in the piping path 15 on the way. These are housed in the main body 1 together with electric components such as a vacuum pump 18 and other control units (not shown).

Here, the opening degree of the valve 17 is adjusted while operating the vacuum pump 18, and the suction pressure can be arbitrarily set by the vacuum gauge 2. As a result, the same suction pressure as that of the target volume reducer is set, and the same operation time as the powder suction time in the volume reducer is set by the timer 3 shown in FIG. Reproduce the deaeration mechanism. In this case, the same type of filter 8 as that used in the volume reducer is attached in advance.

FIG. 4 is an explanatory view in vertical section showing a specific procedure of volume reduction measurement in the present embodiment. First, the weight of the cell A is measured in advance in an empty state where no powder is put. Then, as shown in FIG. 1A, the cell A is mounted on a mount 12 provided on the main body 1, and the powder
Is supplied, and the upper portion of the cylindrical member 14 is sufficiently filled. In this state, the start button 4 shown in FIG. 1 is pressed, and the air contained in the powder 10 in the cell A as indicated by an arrow a is passed through the air hole 12c of the mount 12 at a predetermined suction pressure and time. Is sucked and degassed, the bulk of the powder 10 is reduced (that is, the bulk density is increased) as shown by the arrow b.

Next, as shown in FIG. 2B, the cylindrical member 14 is removed from the cell A, and a flat scraper 19 is formed.
Is moved as shown by the arrow c to scrape off the powder 10 rising from the upper end of the cell A, and bring the powder 10 into the cell A completely. Finally, in this state, the cell A is removed from the mount 12 and the weight is measured as shown in FIG. By subtracting the previously measured weight of the cell A itself from the measured value, the weight of the degassed powder 10 at 100 cc can be determined, and its bulk density can be calculated.

By comparing this with the bulk density of the raw material of the powder 10, it is possible to determine how much the volume of the powder 10 has been reduced by degassing, that is, the rate of increase in bulk density. Note that the powder 10 scraped off by the scraper 19 is
(Not shown in FIG. 4), it may be removed and the powder 10 may be discarded.

FIG. 5 shows a volume reduction machine based on the technique disclosed by the present applicant in the above-mentioned Japanese Patent Application Laid-Open No. 9-58870, and a volume reduction measurement device ( 3 is a graph comparing the rate of increase in bulk density of a tester). Here, the respective increase rates of the bulk density are indicated by percentages on the horizontal axis and the vertical axis.

The suction pressure and time of the tester are, for example, 4000 mmH ₂ O and 2 sec, respectively, in accordance with the volume reducing machine.
Set to about. As for the above-described filter 8 of the tester, the same 2 μm filter as that used in the volume reducer is used. As shown in the figure, the data for each sample is located roughly on the diagonal line where they are equal, and there is no significant difference between the two values, and the suction and deaeration mechanism of the volume reducer is sufficiently reproduced in the measuring device. You can see that it is done.

Here, the bulk density increase rate is defined by the following equation. {(K2−K1) / K1} × 100 (%) where K1: bulk density of powder before volume reduction (g / cc) K2: bulk density of powder after volume reduction (g / cc) .

The names and bulk densities of the nine types of samples are shown below. [Sample] [Raw material bulk density (g / cc)] Potassium titanate 0.079 Zirconia 0.333 Alumina 0.055 Aluminum hydroxide 0.139 Foaming aid 0.287 White carbon 0.246 Calcium carbonate 0.654 Wax Powder 0.215 Styrene resin 0.512 PVC A 0.23

FIG. 6 is a graph showing the relationship between the suction pressure and the bulk density of each sample shown in the legend by the volume reduction measuring apparatus of the present embodiment. The bulk density of these powders can be determined by reading the bulk density of the powder from the suction pressure of the target volume reducer to see how much the volume can be reduced.

[0025]

As described above, according to the present invention,
It is possible to provide a volume reduction measuring device that reproduces the suction and deaeration mechanism of a powder volume reducing device in a compact measuring device and can predict the volume reducing characteristics of the volume reducing device with a simple method. In addition, by using this method, two people spent a whole day measuring the volume reduction characteristics of the target volume reduction machine.
A single person can test in minutes.

According to the second aspect, the suction force is strengthened as the volume is reduced, and the airtightness can be maintained reliably.

According to the third aspect of the present invention, the uniform suction of the powder enhances the efficiency of the suction and maintains the uniformity of the bulk density.

Further, according to the present invention, the powder is prevented from scattering around, and the spilled powder can be easily disposed of, so that the periphery of the apparatus is not stained.

[Brief description of the drawings]

FIG. 1 is an external view of an embodiment of a volume reduction measuring device according to the present invention.

FIG. 2 is a longitudinal sectional view showing a specific configuration of a cell.

FIG. 3 is a diagram showing an air flow for degassing in the embodiment.

FIG. 4 is an explanatory diagram showing a specific procedure of volume reduction measurement in the embodiment.

FIG. 5 is a graph comparing the rate of increase in bulk density between a volume reduction device and a volume reduction measurement device.

FIG. 6 is a graph showing the relationship between suction pressure and bulk density in each sample.

FIG. 7 is a cross-sectional view showing an example of the configuration of a conventional volume reducer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Vacuum gauge 3 Timer 4 Start button 5 Butt 6 Casing 7 Bottom plate 8 Filter 9, 13 O-ring 10 Powder 11 Bolt 12 Mount 14 Cylindrical member 15 Piping route 16 Air filter 17 Valve 18 Vacuum pump A cell

Claims (4)

[Claims] 1. A cell having a casing filled with powder and a filter detachable from the casing, wherein the powder is degassed via the filter at a predetermined suction pressure and a predetermined time. And measuring the bulk density of the powder after degassing. 2. The air conditioner according to claim 1, further comprising a mount for attaching the cell via an O-ring, and maintaining the airtightness between the mount and the cell by a suction force at the time of degassing. Volume measurement device. 3. The volume reduction measuring device according to claim 1, wherein a space is provided on the suction side of the filter so that the powder is uniformly degassed over the entire surface of the filter. . 4. An outer peripheral surface of the cell is a tapered surface, an outer diameter of the mount is smaller than an outer diameter of the cell, and a butt for receiving the powder spilled from the cell is provided in the mount so as to be substantially fitted. The volume reduction measuring device according to claim 2 or 3, wherein