JP5724511B2 - Powder and particle metering device - Google Patents

Description

  The present invention relates to an apparatus for measuring a predetermined amount of a granular material having poor fluidity. The present invention relates to a metering device for powder particles used in a wide range of fields such as industrial and food applications.

  In the fields of industry, food use, etc., there are production processes in which powder particles are repeatedly weighed. In these processes, an apparatus capable of accurately and efficiently weighing the powder particles is required.

  Many of the granular materials that are substances to be weighed have a property called `` adhesion '' in which particles adsorb each other, and when pressed, the granular material is solidified to form a lump, It is known that there is a problem in supplying materials.

  In addition, dry small particle material has a problem that static electricity is generated due to friction between the particles, and the particles adhere to the equipment wall surface, resulting in poor measurement accuracy. It is difficult to handle in the supply / transport process.

  On the other hand, in the case of a large-diameter granule, a phenomenon is known in which a large number of voids are formed by bridging particles called bridges. This may cause deterioration in measurement accuracy in a capacity measurement type weighing device.

  In order to prevent such deterioration of the measurement accuracy due to the bridge, a technique for eliminating the bridge formed between the powder particles by applying mechanical vibration to the cavity filled with the powder particles has been known. However, in bridge measures due to vibration of weighing equipment, when used continuously and for a long time at production sites, etc., there is a risk that mechanical vibrations will cause failure, damage, deterioration of weighing accuracy, etc. There is.

  For example, Patent Document 1 discloses a quantitative supply device for a granular material that measures and supplies a certain amount of granular material. The device described in Patent Document 1 is a device in which a nozzle is disposed at a lower portion of a material supply hopper, a measuring cup is provided at the lower portion of the nozzle, and a screw auger and an air vent hole are provided for the purpose of improving measuring accuracy. .

  Patent Document 2 describes a measuring device in which a measuring cavity is installed at the lower part of a material supply hopper and the material is supplied by dropping due to its own weight.

JP 2000-326902 A JP-A-9-196732

  However, in the weighing device having the screw auger of the cited document 1, the device itself has a large and complicated configuration, and the manufacturing cost increases. In addition, when a screw auger is used, accurate measurement is possible if the particle size of the raw material is relatively uniform. However, if the particle size is non-uniform, the measured value varies and the measurement accuracy is reduced. There is a problem that it depends on the material.

  Moreover, in the measuring device described in Patent Document 2, a measuring cavity is installed in the lower part of the material supply hopper, and the material is supplied by dropping due to its own weight, so the measured value is the total amount of powder in the hopper. There is a problem of being easily affected.

  The present invention solves such a problem of the prior art, and is a capacity-measuring type powder capable of high-speed and high-precision weighing with a simple configuration including a hopper, a cavity, and a driving device. It is an object of the present invention to provide a granule metering device.

In the invention according to claim 1 to solve the above problems, a particulate material metering device capacitance measuring system comprising a measuring unit comprising a metering cavity capable metering of the material feed hopper and a capacitor, A pre-weighing cavity movable between the material supply hopper and the metering cavity, wherein powder material is supplied from the material supply hopper to the pre-metering cavity, and the pre-measuring cavity to which the powder material is supplied is It moves to the measuring cavity, the powder in the preliminary measuring cavity is supplied to the measuring cavity, and the supply of the granular material from the preliminary measuring cavity to the measuring cavity is performed in multiple times. It was set as the capacity | capacitance measurement type powder particle | grain measurement supply apparatus characterized by these.
According to a second aspect of the present invention, the measuring unit includes a measuring piston, and the capacity in the measuring cavity can be adjusted by moving the measuring piston in the measuring cavity. It was set as the granular material measurement supply apparatus of description.
According to a third aspect of the present invention, a plurality of the pre-weighing cavities are provided, the plurality of pre-measuring cavities are arranged concentrically on the blade, and the pre-measuring cavity is made of a material by intermittent or continuous rotational movement of the blade. The granular material metering device according to claim 1 or 2, wherein the powder material metering device is moved between the feeding hopper and the metering cavity.
According to a fourth aspect of the present invention, there is provided the granular material metering device according to any one of claims 1 to 3, wherein the granular material metering device further includes a static elimination mechanism.
Moreover, as invention concerning Claim 5, it was set as the granular material measurement supply apparatus of any one of the Claims 1 thru | or 4 with which a granular material measurement supply apparatus is further equipped with a moisture-proof mechanism.

  According to the first aspect of the present invention, the granular material supplied from the material supply hopper is once supplied to the preliminary measurement cavity, the preliminary measurement cavity moves, and the granular material supplied to the preliminary cavity has a capacity. Is supplied to a measuring cavity for measuring Thereby, it becomes possible to measure with high accuracy without being influenced by the amount of the granular material inside the material supply hopper. When powder is supplied directly from the material supply hopper to the measurement cavity, the pressure applied to the powder supplied to the measurement cavity varies depending on the amount of powder in the material supply hopper. It is not possible to measure the exact capacity of. According to the first aspect of the present invention, since a small amount of powder particles below the capacity of the predetermined pre-weighing cavity are always put into the measuring cavity, the amount of powder particles inside the material supply hopper is not affected. Accurate capacity can be measured.

  Moreover, according to the invention concerning Claim 1, supply of the granular material from the said preliminary measurement cavity to the said measurement cavity is performed in two or more parts. By supplying the granular material from the pre-weighing cavity to the measuring cavity in multiple times, the supply amount of the granular material from the pre-measuring cavity to the measuring cavity can be reduced, and once for the granular material Pressure is dispersed, adhesion between the powder particles in the measurement cavity is reduced, and accurate volume measurement can be performed.

  Moreover, according to the invention concerning Claim 1, since the material measuring method is a capacity measuring method, a weight measuring device such as a load cell and a filling device such as a screw auger are not required, which is advantageous in terms of cost.

  According to the second aspect of the present invention, it becomes easy to perform measurement stepwise by moving in the measurement cavity. In addition, the amount of powder particles supplied into the measurement cavity at a time can be reduced, and bridge troubles in the measurement cavity can be solved. Further, by performing the weighing operation a plurality of times, the material having a non-uniform particle size is dispersed, and the weighing accuracy can be improved.

  According to the invention of claim 3, by providing a plurality of pre-weighing cavities and arranging the plurality of pre-measuring cavities concentrically on the blade, the pre-weighing cavity can be obtained by intermittent or continuous rotational movement of the blade. It is possible to efficiently move between the material supply hopper and the measurement cavity.

  According to the invention of claim 4, the powder particle metering device includes a static elimination mechanism, thereby suppressing adhesion of the powder particles to the wall surface of the material supply hopper, the metering cavity, or the preliminary metering cavity, More accurate capacity measurement can be performed.

According to the invention concerning Claim 5, when the granular material metering device includes a moisture-proof mechanism,
When measuring, it is possible to suppress an increase in the volume of the granular material due to the adhesion of the granular material to the wall surface due to moisture absorption or the adsorption between the granular materials, and a more accurate capacity measurement can be performed.

FIG. 1 is a schematic view (perspective view) of a granular material metering device according to an embodiment of the present invention. FIG. 2 is an explanatory view (schematic cross-sectional view) of a preliminary weighing process and a multi-stage weighing process of the granular material weighing and supplying apparatus according to the embodiment of the present invention. FIG. 3 is an explanatory view (schematic cross-sectional view) of the discharge and supply process of the granular material metering and supply device according to the embodiment of the present invention. FIG. 4 is another explanatory view (perspective view) of the discharge and supply step of the granular material metering device according to the embodiment of the present invention.

  Hereinafter, the granular material metering device of the present invention will be described.

  FIG. 1 shows a schematic view (perspective view) of a granular material metering device according to an embodiment of the present invention. In the granular material metering device of FIG. 1, a circular blade 2 having a plurality of preliminary metering cavities 3 and discharge cavities 6 concentrically arranged at the lower end of the material supply hopper 1. The circular blade 2 can rotate between the material supply hopper 1 and the surface plate 4, and can also slide on the surface plate 4 to move in parallel. A surface plate 4 is arranged under the circular blade 2, and the surface plate 4 includes a measuring unit. The measuring unit includes a measuring cavity 5 and a measuring piston 7 at the lower end of the measuring cavity 5, and can move up and down, so that the capacity of the measuring cavity 5 can be made variable. A pre-weighing cavity 3 in the circular blade 2 is formed through the blade so that the powder particles can move between the material supply hopper 1 on the upper surface and the weighing cavity 5 on the lower surface. On the other hand, the discharge cavity 6 in the circular blade is formed with a gap in the lower part of the blade so that a granular material can be formed between the measurement cavity 5 and the supply port 9 on the lower surface, and the gap penetrates to the upper surface of the blade. Absent.

  The lower end portion of the material supply hopper 1 and the upper surface of the circular blade 2 are provided in contact with each other, and the granular material filled in the preliminary measurement cavity 3 can be worn out by the movement of the circular blade 2. ing. Similarly, the lower surface of the circular blade 2 and the upper surface of the surface plate 4 are provided so as to be in contact with each other, and the granular material filled in the measurement cavity 5 from the preliminary measurement cavity 3 can be worn out by the movement of the circular blade 2. ing.

  Further, the surface plate 4 includes a supply port 9 for supplying the weighed granular material to the next process. In the granular material measuring and supplying apparatus of the present invention, the capacity of the granular material charged from the material supply hopper is measured in the measuring cavity, and the measured granular material is supplied from the supply port 9 to the next process. .

  In addition, in the granular material measurement supply apparatus of this invention, if the preliminary measurement cavity 3 is a structure which can move between the material supply hopper 1 and the measurement cavity 5 in a horizontal direction, it will not be limited. Further, the blade for storing the preliminary weighing cavity 3 is not limited to the circular blade 2. For example, the blade may be rectangular and the pre-metering cavity may reciprocate linearly between the material supply hopper and the metering cavity. In addition, an air cylinder, a servo motor, a stepping motor, and the like can be considered as the driving mechanism of the weighing unit 8, and can be appropriately selected in consideration of weighing accuracy.

  Next, a method for measuring and supplying a granular material using the granular material measuring and supplying apparatus of the present invention will be described. FIG. 2 shows an explanatory view (schematic cross-sectional view) of a preliminary weighing process and a multi-stage weighing process of the powder and granular material metering supply apparatus according to the embodiment of the present invention. FIG. 3 shows an explanatory view (schematic cross-sectional view) of the discharge and supply process of the granular material metering and supply apparatus according to the embodiment of the present invention.

(Preliminary weighing process)
First, the granular material is put into the material supply hopper 1. The material supply hopper 1 and the circular blade having the pre-weighing cavity 3 are in contact with each other. When the circular blade 2 rotates and moves the pre-weighing cavity 3 to the lower part of the hopper, the granular material is transferred to the pre-measuring cavity 3. It is filled (FIG. 2 (a)).

(Multi-stage weighing process)
Subsequently, when the circular blade 2 starts to rotate again, the material is scraped off at the upper end of the pre-weighing cavity 3 and the lower end of the material supply hopper 1, so that the particles less than the capacity of the pre-weighing cavity 3 3 is supplied. Further, by the rotational movement of the circular blade 2, the preliminary weighing cavity 3 filled with the granular material moves to the weighing unit.

  In the measuring unit, it is possible to adjust the capacity in the measuring cavity by adjusting the lower end of the measuring cavity 5 by moving the measuring piston 9 up and down. First, the measurement cavity 5 moves the measurement piston 7 up and down to set the measurement value of the granular material supplied from the preliminary measurement cavity to the measurement cavity. Thereafter, the circular blade 2 is rotated, the pre-measuring cavity 3 filled with the granular material is stopped at the upper part of the measuring cavity 5, and the material of the pre-measuring cavity 3 is dropped and filled into the measuring cavity 5 (FIG. 2B). )). Subsequently, when the circular blade 2 rotates, a scraping operation is performed at the upper end portion of the measuring cavity 5, and the powder material for one measurement value is filled in the measuring cavity 5 (FIG. 2 (c)). ). Subsequently, the measuring piston 9 is moved downward to increase the capacity of the measuring cavity 5, and the second measured value is set. After that, the circular blade is rotated and moved, and the same measurement / scraping operation is performed to supply a predetermined amount of powder particles to the measurement cavity. The above operation is repeated until a predetermined measurement value set in advance is measured by the measurement cavity (FIG. 2D).

(Discharge supply process)
Next, a description will be given of a method for transporting the powder particles volume-measured to the measuring cavity to the supply port 9. When a predetermined measurement value is weighed in the measurement cavity 5 and the measurement process is completed, the circular blade 2 is rotated to dispose the discharge cavity above the measurement cavity 5 filled with the granular material (FIG. 3E). ). Next, the measuring piston 9 is raised, and the particles measured in the measuring cavity 5 are moved to the discharge cavity 6 (FIG. 3 (f)). Next, the circular blade 2 is moved horizontally to move the discharge cavity 6 to which a predetermined amount of powder is supplied to the upper part of the supply port 9, and the powder in the discharge cavity is discharged to the supply port 9 (FIG. 3). (G)).

  FIG. 4 also shows an explanatory view (perspective view) of the discharge and supply process of the powder and granular material supply apparatus according to the embodiment of the present invention. As shown in FIG. 4A, when a predetermined measurement value is weighed in the measurement cavity 5 and the measurement process is completed, the granular material in the measurement cavity is moved to the discharge cavity 6. Next, as shown in FIG. 4 (b), the circular blade 2 is moved horizontally to move the discharge cavity 6 to which a predetermined amount of powder is supplied to the upper part of the supply port 9, and the powder in the discharge cavity is moved. Discharge to the supply port 9.

  Through the preliminary weighing process, the multistage weighing process, and the discharge and supply process, the granular material charged from the material supply hopper is volume-measured in the measurement cavity and discharged from the supply port.

  In addition, the supply method from a supply port can be changed according to the usage method of a granular material. For example, a cup or bag is placed at the supply port and a predetermined amount of powder is filled, a transfer mechanism is installed at the supply port, and a predetermined amount of powder is transferred to the next processing step. can give.

  In addition, when it is not necessary to supply in granular form, it is also possible to pressurize the granular substance inside the measuring cavity 5 in which a predetermined amount of granular substance is measured and supply it in the form of a tablet. . By making the tablet shape inside the measurement cavity, problems that often occur in powder and granular materials such as adhesion and moisture absorption can be reduced.

  Furthermore, a neutralization mechanism can be attached to the material supply hopper 1, the circular blade 2, each cavity, and the like of the granular material measurement and supply device of the present invention. By providing the static elimination mechanism, it is possible to suppress the adhesion of the granular material to each wall surface and improve the measurement accuracy. In addition, a well-known thing can be used as a static elimination mechanism.

Furthermore, a moisture-proof mechanism can be attached to the material supply hopper 1, the circular blade 2, each cavity, and the like of the granular material metering device of the present invention. By providing the moisture-proof mechanism, it is possible to suppress an increase in the volume of the granular material due to the adhesion of the granular material to the wall surface and the adsorption between the granular materials, and the measurement accuracy can be improved. In addition, a well-known thing can be used as a moisture-proof mechanism.

DESCRIPTION OF SYMBOLS 1 ... Material supply hopper 2 ... Circular blade 3 ... Preliminary measurement cavity 4 ... Surface plate 5 ... Measurement cavity 6 ... Discharge cavity 7 ... Measurement piston 8 ... Measurement unit 9 ... Supply port

Claims (5)

A granular material metering device for capacitive measuring system comprising a measuring unit comprising a metering cavity capable metering of the material feed hopper and a capacitor,
A pre-weighing cavity movable between the material supply hopper and the weighing cavity;
The granular material is supplied from the material supply hopper to the preliminary weighing cavity, the preliminary weighing cavity to which the granular material is supplied moves to the weighing cavity, and the granular material in the preliminary weighing cavity is transferred to the measuring cavity. A capacity-measuring-type granular material measuring and supplying apparatus characterized in that the granular material is supplied to the measuring cavity from the preliminary measuring cavity in a plurality of times.   2. The granular material metering device according to claim 1, wherein the metering unit includes a metering piston, and the capacity of the metering cavity can be adjusted by moving the metering piston in the metering cavity.   A plurality of the pre-weighing cavities, wherein the plurality of pre-weighing cavities are arranged concentrically on the blade, and the pre-weighing cavity moves between the material supply hopper and the weighing cavity by intermittent or continuous rotational movement of the blade; The granular material metering device according to claim 1 or 2, characterized by the above. Granules metering device granular material metering device according to any one of claims 1 to 3, characterized in that further comprises a neutralizing mechanism. The granular material measurement and supply device according to any one of claims 1 to 4, wherein the granular material measurement and supply device further includes a moisture-proof mechanism.

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