US 3844413 A
A device for analysing the particle size distribution of very small particles such as sand, etc., from a given quantity of water of river or sea by precipitation onto a receiving plate rotating at a very low speed in a body of water, larger particles descending earlier than smaller ones, whereby the particles of different sizes are separately precipitated onto the receiving plate and collected according to size distribution.
Claims available in
Description (OCR text may contain errors)
D United States Patent 1191 1111 3,844,413 Mizushima Oct. 29, 1974 I541 PARTICLE SIZE DISTRIBUTION 2,887,227 5/1959 Dunham 209/209 ANALYSER 3,222,925 12/1965 Kracke et a]. 73/28 x 3,405,548 10/1968 Samarzopoulos 73/432 PS X  Inventor: Taken Mizushima, Tokyo, Japan I FOREIGN PATENTS OR APPLICATIONS  Asslgnee' g f wfgg ggf Kabush'k' 2,053,448 4/1971 France 209/209  Filed: June 4, 1973 Primary Examiner-Frank W. Lutter Assistant ExaminerRalph J. Hill ] Appl' 366688 Attorney, Agent, or Firm-Cushman, Darby &
Cushman  Foreign Application Priority Data July 26, 1972 Japan 47-74765  ABSTRACT A device for analysing the particle size distribution of (gill. 209/20gb'37g/g/ld3 very Small particles Such as sand, etc" from a given  Fieid 210/83 quantity of water of river or sea by precipitation onto E 73/6l 432 a receiving plate rotating at a very .low speed in a body of water, larger particles descending earlier than  R f n Cit d smaller ones, whereby the particles of different sizes e e are separately precipitated onto the receiving plate UNITED STATES PATENTS and collected according to size distribution. 1,046,447 12/1912 Delameter 209/209 2,702,122 2/1955 Joaquin 209/209 3 (351M513 Drawmg PARTICLE SIZE DISTRIBUTION ANALYSER BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a device for sorting and classifying very small particles.
2. Description of the Prior Arts When the water of river or sea is treated for use as industrial water and drink water, it is required to chemically analyze the quality of water as well as to remove minerals such as sand particles. In this connection, it is necessary to know what sizes of particles of sand are contained in a determined amount of water of the river or sea. Conventionally, there is used a standard sorting device having a sieve of 0044mm mesh, which is the minimum size of the sieve available in accordance with 118 (Japanese Industrial Standards).
A known automatic particle size measuring device includes a water vessel in which a balance is provided to measure particles stirred up and descended onto a receiving dish, thereby measuring the distribution of the particle size, based upon the amount of particles precipitated in a determined time.
Such a device requires a relatively large amount of samples to operate satisfactorily.
However. it is generally difficult to obtain such a large amount of samples of the water of river or sea.
Furthermore, such a device can analyze distribution of particles sizes but since the particles precipitated on the balancedish are not sorted according to the sizes thereof, it is not known what sized particles are contained in the samples in what percentage.
SUMMARY or THEINVENTIGN It is the object of this invention is to provide a device having an easy-operable and simplestructure to accurately analyze, sort and measure particles even with a small amount of samples.
The device comprises a transparent water vessel, a top sealing cover, a shaft perpendicularly passing through said cover and rotatably carried by said cover, an horological mechanism to drive said shaft, a first inserted cap member having two concentric side walls and fixed to said shaft to be co-rotatable therewith, a second cup member having two concentric side walls adapted to receive said two concentric side walls of saidfirst cup member, said second cup member being carried by said shaft to be adjustable of its position along said shaft. and an annular dish mounted in said in said second cup member in an annular space defined the two concentric side walls thereof, said first cup member having a sample inlet port opening to said, annular space.
BRIEF DESCRIPTION or THE DRAWINGS FIG. I is a longitudinal section of an embodiment of the device according to this invention; and
FIGS. 2 and 3 are plan views of two examples of the annular dishes to be incorporated in the device as shown in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, this invention will be described of a preferred embodiment with reference to the accompanied drawings.
A water vessel I made of a transparent synthetic resin or glass having feet 2 is equipped with a top cover 3 sealing the upper opening of said vessel, and a rotary shaft 4 is perpendicularly passing through the cover 3 at the center of the vessel 1.
The rotary shaft 4 is abutting against the bottom of the vessel I at the lower-most end thereof where it is conically shaped and is carried at its upper portion by rollers 6 of a bearing 5 provided at the cover 3. The shaft 4 is in turn carrying a gear 7 at its upper end portion, which is in meshing engagement with a gear 8 of an horological mechanism 9 to be driven by the mechanism.
An upper end plate 11a of a first cup member 10 is fixed to the rotary shaft 4 and inner and outer cylindrical side walls 11b, 11c integrally connected with the end plate 11a extend downward therefrom.
The end plate 11a is provided with a funnel shaped sample inlet port 12.
A second cup member 13 includes a bottom plate 14a through which the rotary shaft 4 passes in a manner to permit axial movement therebetween. Side walls 14b, of the second cup member 13 receive therebetween the side walls l lb, llc of the first cup member 10, thereby defining an annular space closed at upper and lower ends thereof. The bottom plate 14a is provided with several draining holes 15 opening in the region of the annular space. An annular receiving dish 16 is placed at the bottom of the annular space to fit the side walls 14b, 14c.
The receiving dish 16 may, for example, be of the shapes in FIGS. 2 and 3. The receiving dish 16 shown in FIG. 2 is used to analyse and sort. particles of diameter d in the range of 0.005 d 0.05mm. The annular dish is divided by partitions 17 to provide separate receiver sections A, B. C, and D on the receiving dish 16. The receiving dish 16 shown in FIG. 3 provides receiver sections E and F adapted to sort particles two parts of d 0.005mm and d 0.005.
The bottom plate 14a of the second cup member 13 is provided with a stopper 18 to adljustably mount the second cup member 13 to the shaft 4 with respect to its height.
The shaft 4 is provided with centimetric measuring marks 19 at the lower end portion thereof for the convenience of adjusting the height of the second cup member. Said centimetric measuring marks 19 is conversely marked from up to down to give the height h from the inlet point of the sample introduced through the inlet port 12 to the bottom of the receiving dish 16.
The particles to be sorted in the receiver sections A, B, C, and D of the receiving dish 16 are within the range of 0.005 d 0.05mm particle size as mentioned above. The descending speed (cm/sec) of the particles varies according to water temperature and specific gravity of the particles and as a result of experiments, the inventor has obtained the data as shown in Table I. Table I. Descending speed (cm/sec) of the Particles in ewmn Thus, assuming conditions that the descending height h is 20cm and the water temperature is 15C, a particle having diameter of 0.05 mm and specific weight 2.65
shows descending speed of 0.196 cm/sec and takes about 1 min. 40 sec to reach the receiving dish. For the same conditions, another particle of 0.005 mm diameter and 2.65 specific weight shows descending speed of 1.96 X 10' cm/sec and takes about 2 hours and 46 min. to reach the receiving dish.
The sorting device according to this invention is of descending and precipitating type wherein the samples are dropped in the still water thereby analyzing the particles regardless the quantity of the samples, and since the samples descend perpendicularly in the water, the weight of the samples themselves is clearly distinguished whereby no differently-sized particles are mixed in a group of the particles precipitated on a funnel shaped section. The device itself is operated with a simple mechanism and construction in such a manner that the receiving dish 16 is rotated with an horological gear through gears 9, 10, thereby allowing cheaper installation cost, wherein the height (h) of the receiving dish 16 is indicated on the given centimetric marks through the transparent vessel 1. By the transparent vessel, there are obtained other features of permitting to check the descending and precipitating condition of the samples. Furthermore the device is used to analyze and sort the particle sizes of medicines and other materials which are not soluble.
As discussed hereinbefore, the sorting device of this invention can be widely used in the industries for sorting and classifying particles.
Modification to the above embodiment will be made without departing from the spirit and technical scope of this invention.
What lclaim is:
1. A device for sorting and classifying very small particles comprising:
a. a transparent water vessel,
b. a top sealing cover,
c. a shaft perpendicularly passing through said cover and rotatably carried by said cover,
d. an horological mechanism to rotatably drive said shaft,
e. a first inverted cup member having two concentric side walls and fixed to said shaft to be co-rotatable therewith,
f. second cup member having two concentric side walls adapted to receive said two concentric side walls of said first cup member, said second cup member being carried by said shaft and including means for adjusting its position along said shaft, and
g. an annular dish mounted in said second cup member in an annular spaced defined by the two concentric side walls thereof, said first cup member having a sample inlet port opening to said annular space. 2. A device according to claim 1, wherein said annular dish is separated into sectoral portions by partitions.
sition of said second cup member on said shaft.