JPS6022644A - Apparatus for measuring apparent density of powdery granule - Google Patents

Abstract

PURPOSE:To measure both loosened and tightened apparent densities and to obtain quickly a stable measured value without person's help by providing means for filling loosely and tightly a sample into a vessel, a means for weighing the weight of the sample in the vessel and a means for calculating and displaying both apparent densities of the sample. CONSTITUTION:The sample supplied from a chute 6 falls uniformly into the vessel 7 and is packed therein. The vessel 7 is carried on an electron balance 5 by whirling a whirling arm 4, and mounted on a weighing base 5a. Thus, a weight value weighed by the balance 5 is inputted specially as an electric signal into a microcomputer 9, calculated instantaneously by the weight and inner volume of only the vessel 7 previously stored and inputted, and the result is displayed as the loosened apparent density of the sample. On the other hand, rising and dropping of a mounting base 27 are performed by arbitrary prescribed number of times while supplying the sample into the vessel 7 to apply an impact due to the dropping to the vessel 7, and the sample is tightly packed in the vessel 7. Thereafter, the tightened apparent density due to the tightly packing is measured by the process similar to above-described one.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring bulk density of powder or granular material.

When handling granular materials, it is extremely important to know the characteristics of the granular material itself. However, unlike the properties of solids and liquids, the properties of powder and granular materials depend on only a few factors.
It is difficult to judge its characteristics. This is because there are far more factors that determine the physical behavior of ``powder'' than in solids, liquids, etc., and the interrelationships between each factor may be intertwined with each other in ways that are invisible to the eye. . The typical static characteristic of a powder or granular material is its particle size, and it is no exaggeration to say that this particle size is the only practical indicator of a powder or granular material. On the other hand, in the actual processing of powder and granular materials, dynamic behavior is important, and although there is a strong need for appropriate display values that represent the state and degree of this behavior, Note that only the angle of repose and loose bulk density are used. Moreover, these are only factors that indicate the static behavior of the powder and granular material, and are not suitable for expressing the dynamic behavior. Therefore, the bulk density in a predetermined consolidated state is
Here, it is called the compaction bulk density, and the change in these values is used to measure the degree of compressibility of the powder or granule.This value is called the degree of compaction, and this value is used to express the dynamic characteristics of the powder or granule. It is being used in some departments.

However, in the step of measuring the loose bulk density and hard bulk density to obtain the measurement value of the degree of compression, even if a measuring instrument is used, it is mostly done manually, so errors may occur in the measurement by the measurer himself. It has not yet been put into practical use due to problems such as being easy to use, taking time to measure, and viscosity caused by measuring instruments. In view of these points, the present invention provides a measuring device that can measure both the loose bulk density and the hard bulk density, and can quickly obtain stable measured values without manual intervention. In addition, in this respect, the present invention relates to the earlier applications, JP-A-57-53640 and JP-A-57-70429, which presented a measuring device for automatically measuring the loose bulk density.
This invention is intended to further expand the scope of application by adding a new mechanism to the invention of Publication No. -. That is, FIG. 1 shows the main part according to the above-mentioned Japanese Patent Application Laid-open No. 57=53640,
A container 50 for containing a sample, a means 51 for supplying the sample into the container 50, and a means 5 for removing excess sample from the container volume.
2, a means 53 for weighing the sample in the container 50 from which the surplus sample has been removed, a means 54 for discharging the weighed sample in the container 50, and sequentially transporting the container to each site having each of the means. means 55 for calculating and displaying the bulk density of the sample as a quotient of the sample weight and the container volume, and a timer 57 for sequentially operating each of the above means. Fig. 2 is a device for measuring the bulk density of powder and granular materials.
79429, showing a container 60 for containing a sample, a means 61 for supplying the sample into the container 6o,
A means 62 for removing excess sample lI''1 from the container internal volume, and a means 62 for weighing the sample in the container after removing the surplus sample, and determining the bulk of the sample 1'') by the quotient of the weight of the sample and the container internal volume. Measuring the bulk density of powder or granular material, comprising means 66 for calculating and displaying the density, means 64 for discharging the weighed sample in the container, and a timer 67 for sequentially operating each of these means. It is a device. In contrast, the present invention
a container for storing a sample; a means for roughly filling the sample into the container; a means for removing surplus sample outside the container volume after supply and weighing the sample in the container; Alternatively, there may be a means for compactly filling the sample into the container by applying a predetermined external force such as compression or shock to the sample or container after supply, and a means for compactly filling the sample into the container after the compaction filling, and removing excess sample that accumulates outside the container volume to reduce the weight of the sample inside the container. The bulk density and the compaction of the powder and granular material in a roughly packed state are constructed by a means for weighing and a means for calculating and displaying the bulk density of the sample using the quotient of the weight of the sample and the internal volume of the container. The bulk density in the packed state is measured separately, and the degree of compression of the sample itself is determined using these values, for example, with the former bulk density being A and the latter bulk density being P, C- , (P-, A)/P In addition to calculating the degree of compression, various statistical values such as the average surface and standard deviation value of both bulk densities can also be calculated and displayed. , these series of operations can be automatically and continuously controlled.

The present invention will be explained below with reference to Examples. In Figures 3 to 6, reference numeral 1 denotes a main body stand, on which the two sides of the stand are kept horizontal by adjusting the legs 10, and on which the sample is supplied to the container 7 and the excess sample outside the internal volume is removed. a supply section for taking the sample, an impact applying mechanism for compaction filling, a weighing section consisting of an electronic balance 5,
Except for the supply section and the weighing section 6, it is isolated from the outside, so that influences from the outside during weighing and scattering of dust to the outside can be particularly prevented. In this embodiment, the supply/filling section and the weighing section are disposed at positions substantially perpendicular to the swing arm 4, but the present invention is not particularly limited thereto. Reference numeral 9 denotes a microcomputer, which not only receives the signal value from the electronic balance 5, calculates and displays it, but also arbitrarily controls each of the above-mentioned mechanisms sequentially to enable automatic operation. Also, 15 is close proximity, and electronic balance is 5.
- A rotating arm is provided for the container 7 in
In addition to quickly moving the system 4 and container 7 to the predetermined positions at the start of operation, this detector is used to instruct other machines 4'i& to stand by even if they are marked. Further, the proximity switch 15 may be of a capacitance type, a high frequency oscillation type, or a differential coil type.

Next, the configuration of each mechanism will be explained. As shown in Fig. 4, for the sample supply and impact application mechanism, first, three plug nods 12, 13, and 14 are arranged at appropriate intervals on the support 11 built on the main body stand 1. It is set up. The bracket 12 is located below the supply chute 6, has an opening 1'' 21 with a larger diameter than the container 7, and has a cam 25 on its 2nd part and a connecting rod 26 and a spring 46. are connected to vibrate the diaphragm 23 in the horizontal direction. Reference numeral 34 denotes a scraping blade that is attached to and slidably held at a predetermined height position at the tip of the bracket 13.
It is equipped with a cylindrical cam 30 for raising and lowering the motor, and is equipped with an f reduction motor 17. Note that a pin 32 is mounted on the mounting table 27 side, and the pin 32 is inserted into the groove 3 of the cylindrical cam 30.
1 and raises the mounting table 27 to a predetermined height, and then the pin 32 is engaged with the pin 31.
The configuration is such that the mounting table 27 is dropped when the mounting table 27 is detached from the holder. In addition, the mounting table 27 is equipped with an opening 28 to prevent the sample from being deposited on the table, and a stopper 33 is thinly attached to the support 11 to prevent unnecessary rotation. . 3 is a sample tray, and 43 and 44 are dustproof covers.

In FIG. 5, reference numeral 4 includes a stepping motor 20 connected to the swing a. Further, the arm shaft 36 is provided with a boulder 37 at its tip for holding the container 7. and,
The swing arm 4 itself is placed on a lifting table 38 via a bearing 39 and connected to a stepping motor 19.

The lifting table 38 has a support shaft 40 vertically installed on the main body table 1.
The main body table 1 is held by a cam 41 of a stepping motor 18 disposed on the main body base 1, and is moved up and down. Also, regarding container 7, as shown in Figure 6.
Flange portions 8 are formed at both lower ends to prevent the container 7 held by the holder 37 from falling off. In addition,
The flange 8 can be held sufficiently by the holder 37, and an appropriate gap is provided between the container 7 and the holder 37 so that the boulder 37 does not touch the container 7 during weighing. The flange portion 8 is provided with a tapered surface 8a so as to be located at the center of the opening 1142.

If necessary, it is also effective to attach a cushioning material such as rubber or resin to the tapered surface 8a or the holder 37 side to reduce the impact when lifting or lowering the container 7 during feeding and weighing. .

Furthermore, in order to facilitate the discharge of the sample, the inner surface of the container 7 is smoothed, and the inner surface itself has an appropriate slope to prevent the sample from falling and causing an error in the weighed value. Further, the dustproof cover 45 prevents dust from entering the electronic balance 5, and its shape is formed with two sloped surfaces to prevent samples from accumulating.

In the second configuration below, the sample supplied from the sheet coat 6 is decomposed by vibration within the sieve 24 and passed through the sieve 24.
The light falls from the net of the container 7 and falls uniformly into the opening of the lower mounting table 27 into the two-way container 7. Next, the stepping motor 18 is operated to move the lifting platform 38 to the cam 41.
After lifting the container 7 by pushing it up, the stepping motor 19 rotates the swing arm 4 and transports it onto the electronic balance 5. In addition, during this transportation, Plaqueno l-
121 This scraping blade 34 *Container 7
” - excess sample is removed. And the rotating arm 4
When the balance reaches the second position of the electronic balance 5, the cam 41 is rotated to lower the lifting platform 38, and the swing arm 4 is lowered to gently place the container 7 on the weighing platform 5a. In this way, the weight value weighed by the electronic balance 5 is input as an electric signal into the microcomputer 9 separately, and is instantaneously calculated based on the amount taken and the internal volume of the container 7, which is stored in O'+1. Sample 1] Displayed as the bulk density of the meat. In addition, in order to obtain a stable weighing value, it is necessary to keep the container 7 on the weighing table 5a for about 2 to 3 seconds.

Thereafter, the container 7 is pulled up and held by the rotating arm 4 and transported in the opposite direction. Then, there is a temporary stop between the weighing section and the supply section, and during that time, the arm shaft 36 is rotated by the stamping mork 20, and the boulder 37 is rotated.
The sample in the container 7 is discharged by inverting the container 7 until the opening of the container 7 faces downward. After discharging the sample, the container 7
The original opening is turned in two directions, and the swinging arm 4 resumes swinging and stops on the lower mounting table 27 of the sieve 24.

Then, the container 7 is lowered onto the mounting table 27'' by the same process as that for placing it on the weighing table 5al. The second step is the process of measuring the bulk density in a roughly packed state. In response to this, the deceleration motor 17 is operated while the sample in the container 7 is being supplied, and the cylindrical cam 30 causes the mounting table 27 to rise and fall an arbitrary predetermined number of times, so that the impact caused by the fall is applied to the container 7. In addition, the sample is compacted and packed into the container 7. After measuring the bulk density by compaction filling in the same manner as the measurement process described above, the sample in the container 7 is discarded at the sample discharge point by a force v1, and the sample remaining in the container 7 is Further, the container 7 is placed on the mounting table 27'' with the open portion facing downward, and the container 7 is removed by applying the same impact as when applying the impact means. In this way, the container 7 after sample removal is placed on the mounting table 27 in the normal direction and the series of steps is completed, but this measured value is a "consolidated light" award while the former is roughly filled during supply. Therefore, the former is called the loose bulk density, and the latter is called the hardened bulk density, and these values are calculated within the microcomputer 9. In addition, the microcomputer 9 not only calculates and displays these two bulk densities as separate bulk densities, but also calculates standard deviation values and various statistics obtained from the compressibility of the sample itself and changes in bulk density for each weighing amount from both wave calculation values. Values etc. are calculated and displayed. In this embodiment, the sample in the container 7 is compressed and packed by applying an impact to the container 7, but in another embodiment, the above-mentioned mounting table 27 is dropped from the top 11 by +f4 & vice versa. For example, the structure shown in FIG. 8 may be used, in which 70 is a deceleration motor, 74 is a pulley, 73 is a hanging line, and 75 is a holding arm that can be rotated to a predetermined position only when the sample is being suppressed. The gear 7G is provided on the holding arm 75 side, and the deceleration motor 71 is separately attached. Alternatively, as shown in FIG. 9, the sample in the container 7 may be directly pressed at a predetermined pressure to perform compaction filling using a general suppression mechanism using an air cylinder 80 or the like and fluid pressure. In addition, in this embodiment, the microcomputer 9 not only calculates and displays the weighed value, etc., but also operates each mechanical section of the device according to a manually programmed program. All operations are configured to be performed automatically or manually if necessary. FIG. 7 shows a control circuit in the microcomputer 9.
A is the main body of the Microcombi j,-ri9, to which the video display device b, the printer p, and the magnetic tape recording device C are connected, and is connected to the circuit interface f via the expansion Jl interface. The interface f includes a driving circuit d for the stevening morph 18, 19, and 20, a deceleration motor 17, a driving circuit e for the vibration morph 16,
A signal circuit g to external terminals t1 and t4, a toggle j which has a circuit for abnormal rectification and conversion, and an emergency stop unit S are connected. Regarding the control in terms of operation, it is also possible to replace it with a conventionally known control means using a timer and a detection part such as a microswitch, and the present invention is not limited to the microcomputer 9. However, it is possible to use the microcomputer 9 to measure the bulk density in two different filling states, as the mechanism can be simplified, the device itself can be made smaller, and the operating procedure can be changed arbitrarily and easily. What you can do. In addition, the standard deviation value can be determined almost instantly from the degree of compressibility of the sample itself obtained from the values of both bulk densities using the calculation function, and the history of these two values. In addition to these measurements being performed manually, by having the microcomputer 9 perform the operation control and calculation display of these measurements, reliable operation and the simplification of the mechanism itself can be achieved, the device can be made smaller, and measurements can be made more quickly. It is possible to prevent the occurrence of individual errors and individual errors of the measuring person, and a remarkable effect can be obtained in expanding the scope of application of the measuring device.

[Brief explanation of the drawing]

1 and 2 show a conventional device, FIG. 3 is a plan view of an embodiment of the present invention, FIG. 4 is a sectional view taken along line A-A in FIG.
5 is a sectional view taken along the line B-B in FIG. 3, FIG. 6 is an enlarged sectional view of the container 7, FIG. 7 is a control circuit diagram of the microcomputer 9, and FIGS. 8 and 9 are other embodiments. shows. In the figure, 1--main body stand, 4--swivel arm,
5... Electronic balance, 5a... Weighing stand, 7... Container, 9... Microcomputer, 15... Proximity switch, 16... Vibration motor, 17... Deceleration motor , 18.19.20... Nutesoping motor,
23...Diaphragm, 24...Full Ray, 27.
Placement table, 30... Cylindrical cam, 34... Scraping blade, 36... Arm shaft, 37... Boulder, 3
8... It is a lifting platform. 2 Applicant: Fine Powder Engineering Research Institute, Ltd. Figure 3 Figure 6

Claims (1)

[Claims] A container for storing a sample, a means for roughly filling the sample into the container, and a means for removing an excess sample outside the volume of the container and weighing the sample in the container. A means for compressively filling the sample into a container by directly or indirectly applying a predetermined external force, and a means for removing surplus sample deposited outside the volume of the container after the compaction filling and weighing the sample inside the container. In addition, means for calculating and displaying the bulk densities of the sample using the quotient of these weighed values and the internal volume of the container, and means for discharging the weighed sample from inside the container, and a series of these means are operated in sequence. A device for measuring the bulk density of powder or granular material, characterized in that it comprises a control means according to the following.