JP5055183B2 - Method and apparatus for mixing powder particles - Google Patents

Description

  The present invention relates to a powder mixing method and apparatus, and in particular, from a powder storage tank storing powders of a plurality of lots, while reducing variations in powder characteristics between lots, It is related with the method of taking out and mixing, and the apparatus for it.

  Conventionally, after supplying multiple batches of granular material sequentially from the top of the hopper or tank that becomes the granular material storage tank, temporarily storing it in the inside, and then removing the granular material from the bottom of the tank as necessary However, when the characteristics of the granular material supplied from the upper part in such a granular material storage tank vary from lot to lot, in such a storage tank, the granular material having such variation However, it is layered and stacked and stored. For this reason, since the granular material discharged | emitted from the bottom part of a storage tank or taken out from a storage tank will be discharged sequentially, reducing the dispersion | variation in the granular material between such several lots. Was extremely difficult.

  In particular, in the casting field, resin-coated sand (RCS) used to mold molds (main molds and cores) is manufactured in units of up to several hundred kilometres and stored in a granular material storage tank. However, since it is difficult to always make the RCS characteristic for each production batch (lot) always uniform, the RCS characteristic for each batch is subtle. Variation cannot be eliminated even in the RCS taken out from the granular material storage tank, and therefore, when a mold is formed using RCS having such a characteristic variation, the mold characteristics are greatly affected. The problem is that it is difficult to mold a mold having uniform characteristics.

  By the way, in the granular material storage tank which stores the granular material which has the dispersion | variation in such a characteristic, in order to eliminate the variation, the mixing apparatus using power, for example, a mixer, a tank with a stirring screw, air for stirring As a storage tank structure using an attached tank or the like, after the powder particles of each lot are sequentially added, the whole powder particles in the storage tank are stirred and mixed, and then the powder particles are taken out from the storage tank. In that case, in order to agitate and mix the entire granular material in the storage tank, the mixing device becomes larger and the storage tank itself becomes larger. In addition, there is a problem that causes great consumption of energy by using power and causes cost increase.

  In order to make the powder particles discharged from the storage tank uniform, Japanese Patent Publication No. 61-5970 discloses a powder having a structure in which a plurality of discharge ports are provided at the bottom of one storage tank. Although a granular storage tank has been clarified, in such a structure, in a granular material taken out from a plurality of granular particle layers laminated in the storage tank and having various characteristics, It has been difficult to sufficiently reduce the variation, and the granular material discharged from the storage tank still has the same characteristics as in the storage tank.

Japanese Patent Publication No. 61-5970

  Here, the present invention has been made in the background as described above, and the problem to be solved is that a plurality of lots of powder particles are sequentially charged and discharged from a storage tank. An object of the present invention is to provide a powder mixing method and apparatus that can effectively reduce the dispersion of powder particles.

  The present invention can be suitably implemented in various aspects as listed below in order to solve the problems described above or the problems grasped from the description of the entire specification and the drawings. Each aspect described below can be adopted in any combination. It should be understood that aspects or technical features of the present invention are not limited to those described below, and can be recognized based on the description of the entire specification and the inventive concept disclosed in the drawings. It should be.

(1) A rectangular tank body having a rectangular cross section is formed, and the interior is partitioned into a plurality of storage chambers by a plurality of partition plates, and the plurality of storage chambers communicate with each other in the upper part. In a state in which the longitudinal direction is inclined with respect to the horizontal plane and extends upward so that one ridge line of the polygon is positioned at the lowermost part in the cross section, By sequentially charging a plurality of lots of powder particles through a powder particle receiving portion provided at the upper end of the rectangular cylindrical tank main body, the plurality of chambers in the tank main body are moved downward from the upper storage chamber. From the plurality of outflow portions provided respectively at the lowermost positions of the plurality of storage chambers in the ridge line portion located at the lowermost portion of the rectangular tubular tank body, plural Volume chamber accommodating the particulate material is being brought simultaneously outflow respectively, the method for mixing granular material, characterized by being configured so as to be mixed.

(2) The inclination angle of the rectangular cylindrical tank body with respect to the horizontal plane, the inclination angle of the partition plate with respect to the horizontal plane, and the horizontal planes of the inner surfaces of the bottom walls on both sides across the ridge line located at the bottom of the rectangular cylindrical tank body The inclination angle is set so as to be larger than the angle of repose of the charged granular material, and the granular material is allowed to flow down naturally from the plurality of outflow portions. The mixing method of the granular material as described in said aspect (1) characterized by the above-mentioned.

(3) Each of the plurality of storage chambers is formed to have a size capable of storing one lot of powder particles to be stored, and the plurality of storage chambers are filled with the plurality of lots of powder particles. On the other hand, the granular material is stored for every lot, The mixing method of the granular material as described in said aspect (1) or (2) characterized by the above-mentioned.

(4) The method for mixing particles according to any one of the above aspects (1) to (3), wherein the particles are foundry sand or resin-coated sand.

(5) (a) A rectangular tank body having a longitudinal cross-section having a polygonal shape, and the interior is partitioned into a plurality of storage chambers by a plurality of partition plates, and the plurality of storage chambers are at the upper part. The tank main body is provided such that the longitudinal direction of the tank main body is inclined with respect to a horizontal plane and extends upward, and one ridge line of the polygon is positioned at the lowermost part in the cross section. In addition to being arranged at an angle, a powder particle receiving portion is provided at the upper end of the tank body, in which powder particles of a plurality of lots are sequentially put into a plurality of internal storage chambers from the top to the bottom. And a powder storage tank in which a plurality of outflow portions are respectively provided at the lowermost positions of the plurality of storage chambers in the ridge line portion located at the bottom of the tank body, and (b) the Powder storage tank A plurality of outflow portions that are simultaneously opened, and outflow portion opening means configured to allow powder particles stored in the respective storage chambers in the tank body to flow downward from the plurality of outflow portions, respectively. An apparatus for mixing granular materials, comprising:

(6) Each of the plurality of storage chambers is formed in a size that accommodates one lot of the granular material to be stored. The granular material according to the aspect (5), Mixing equipment.

(7) A current collecting means for collecting a plurality of flows of the granular material respectively discharged from the plurality of outflow portions of the granular material storage tank is further provided below the granular material storage tank. The apparatus for mixing granular materials according to the above aspect (5) or (6).

(8) The mixing of the granular material according to the aspect (7), wherein the current collecting means is configured by one or a combination of two or more of a hopper, a chute and a belt conveyor. apparatus.

(9) The powder according to any one of the above aspects (5) to (8), wherein the outflow part opening means is configured by valves respectively arranged in the plurality of outflow parts. Body mixing device.

(10) The granular material according to any one of the above aspects (5) to (9), wherein the rectangular tank body has a triangular, quadrangular, or pentagonal cross-sectional shape. Mixing equipment.

  As described above, in the present invention, the tank body in the granular material storage tank is formed into a long rectangular tube having a polygonal cross section, and the inside of the tank body has a predetermined size by a plurality of partition plates. Each of the storage chambers is partitioned into a plurality of storage chambers, and the storage chambers are connected to each other at the upper portion. The tank body having such a structure has a longitudinal direction in a horizontal plane. The tank body is provided at the upper end of the tank body so as to incline and extend upward and so that one polygonal ridge line is located at the lowest position in the cross section. When a plurality of lots of powder particles are sequentially added through the powder particle receiving unit, the powder particles are sequentially stored from the upper storage chamber to the lower storage chamber with respect to the plurality of storage chambers in the tank body. Sesamera The Rukoto.

  And in the ridgeline part located in the lowest part of the tank main body in such a granular material storage tank, from a plurality of outflow parts provided in the lowest end position of a plurality of above-mentioned storage chambers, a plurality of such storage of the tank main body By letting each granular material stored in the room flow out simultaneously, multiple lots of granular material stored in the tank body can be effectively discharged. In this way, even if there are variations in the characteristics of the granular materials among a plurality of lots, the powder particles of each lot can be mixed sufficiently uniformly. The variation in characteristics can be effectively reduced.

  In particular, in the present invention, each of the plurality of storage chambers is formed in a size that accommodates one lot of the granular material to be stored. Since the powder particles can be substantially stored for each lot, the powder particles stored in the storage chamber stored for each lot are uniformly taken out through each outflow portion. As a result, the homogenization of the powder particles can be further improved, which greatly contributes to the reduction in the variation in characteristics between lots.

  Further, in the present invention, the inclination angle of the rectangular tube-shaped tank main body with respect to the horizontal plane, together with the inclination angles of the bottom wall inner surfaces on both sides sandwiching the ridge line located at the lowermost portion of the tank main body with respect to the horizontal plane, By setting the angle of repose to be larger than the angle of repose of the granule, each of the granules contained in the tank body flows naturally from the multiple outflow parts provided along the ridgeline at the bottom of the tank body. From the point of being able to squeeze out, there is a feature that can advantageously reduce the dispersion of the discharged granular material without the need for any special device such as a mixing device using power. Can be effectively reduced, and an advantage that the cost of the apparatus can be reduced can be enjoyed.

  Among them, in the present invention, when the RCS (resin coated sand) used in the casting field is targeted as the granular material, it is possible to effectively reduce the variation in RCS characteristics for each production batch. From the point of view, when molding a mold using such an RCS, a characteristic that a mold having a certain property such as strength and disintegration can be stably produced can be exhibited.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIGS. 1 to 4 schematically show an example of a tank main body used in the present invention. Specifically, FIG. 1 shows a front view of such a tank body, FIGS. 2 and 3 show its left side view and right side view, respectively, and FIG. The planar form is shown.

  In these drawings, the tank body 2 is a rectangular tube with a long rectangular tube whose cross section in a direction perpendicular to the longitudinal direction is a regular quadrangle, as is apparent from the cross-sectional explanatory views of FIGS. A sealed box body in which both end openings in the center line direction, which is the longitudinal direction, are closed by a lower end wall 4 and an upper end wall 6 that are inclined with respect to the center line direction. Thus, the tank form is formed. Moreover, the rectangular tank body 2 has its lower end wall 4 down, and its longitudinal direction (center line direction) is inclined at a predetermined angle: α with respect to the horizontal plane and extends upward. One rectangular ridge line is supported and arranged by using a known appropriate support mechanism or support device so that it is located at the lowermost part in the cross section, and is in an inclined arrangement form. . In such an inclined arrangement form of the tank body 2, the lower end wall 4 and the upper end wall 6 that close both ends thereof are configured to provide vertical (vertical) wall surfaces as shown in FIG. 1. Yes.

Further, as apparent from FIGS. 5 to 7, five partition plates (walls) 10 a to 10 e are parallel to each other and to the lower end wall 4 and the upper end wall 6 in the tank body 2. Are arranged in parallel to each other at equal intervals in the center line direction, and a plurality of (here, six) accommodation chambers 14a to 14f are here capable of accommodating one lot of powder particles. In addition, the storage chambers 14a to 14f formed in the tank body 2 are communicated with each other by being formed and notching the upper end corners of the partition plates 10a to 10e. The structure is
In addition, the upper end corner in the inclined arrangement form of the tank main body 2 is cut off in the horizontal direction to form a granular material receiving portion 8 composed of a triangular opening as shown in FIG. In this case, a plurality of lots of powder particles are sequentially introduced through the powder particle receiving unit 8, so that the powder particles are transferred from the upper storage chamber 14f to the lower storage chambers 14e, 14d,. Here, each lot is sequentially stored. That is, when one lot of powder is stored in the storage chamber 14f located at the uppermost end, the storage chamber 14f is full, and then the next lot of powder is received by the powder. When charged through the part 8, the powder of the next lot overflows from the uppermost storage chamber 14f and is then stored in the storage chamber 14e located above.
Then, the powder particles of each lot to be introduced one after another overflow the upper storage chamber and can be stored one after another in the lower lower storage chamber, and finally the lowermost storage The powder of the last lot is stored in the chamber 14a. Here, a lot generally refers to a part (group) classified by some common characteristic that can be clearly distinguished, and is also referred to as a batch. It means a collection of powder and granules obtained by processing, processing and processing.

  Furthermore, in the tank body 2 that is inclined and arranged in this manner, the lowest part of each of the storage chambers 14a to 14f is located at the lowermost portion and extends upwardly with a predetermined inclination angle: α. As shown in FIG. 5, a plurality (six in this case) of outflow portions 12 pass through the tank wall and open downward so as to be positioned at the lower end, corresponding to the storage chambers 14 a to 14 f. Thus, each is provided in the same opening diameter. That is, as shown in the figure, six outflow portions 12 are provided at the lowermost positions of the respective storage chambers 14a to 14f, and the granular materials in the respective storage chambers 14a to 14f are provided from these six outflow portions 12. However, each can be drained. In addition, since the lower end wall 4 of the tank main body 2 is a vertical wall together with the upper end wall 6, when the granular material flows out from the respective storage chambers, the granular material is formed on the inner surfaces of these walls. It is designed not to stay.

  As shown in FIG. 8, the tank body 2 having such a configuration is a roof shutter having a three-side covering structure configured to cover the left and right wall surfaces sandwiching the outflow portion 12 and the wall surfaces of the lower end wall 4. 16, the plurality of outflow portions 12 provided in the tank main body 2 are closed by this, and the outflow of the granular material stored in the tank main body 2 is prevented. It has come to be. As shown in the figure, the shutter 16 has a structure in which two flat plates 16a and 16b are abutted at right angles and connected, and one end thereof is closed by a triangular plate 16c having a right isosceles triangle shape. It has been made.

  Next, in the tank body 2 having such a configuration, as shown in FIG. 8, in the form in which the tank body 2 is accommodated and overlapped in the shutter 16 and the outflow portion 12 is closed, the granular material at the upper end portion thereof. When a plurality of lots of powder particles are sequentially fed through the receiving unit 8, one lot of powder is sequentially introduced into the plurality of storage chambers 14a to 14f provided in the tank body 2 from the upper side to the lower side. The particles are stored (see FIG. 5). That is, when the first one lot of powder particles are charged through the powder particle receiving unit 8, the uppermost storage chamber 14f is filled, and then one lot of powder particles is charged. In the form of overflowing from the storage chamber 14f, when the powder for the next one lot is put in the second storage chamber 14e from the top, the two storage chambers 14f and 14e overflow. In the form, it will be stored in the third storage chamber 14d from above, and finally, in the lowermost storage chamber 14a, each of the storage chambers 14b to 14f above it will be After each lot of powder particles is stored, the last one lot of powder particles is stored.

  After that, the shutter 16 shown in FIG. 8 superimposed on the tank main body 2 is moved relatively downward along the longitudinal direction of the tank main body 2, so that the shutter 16 is placed on the ridge line located at the lowermost part of the tank main body 2. The plurality of outflow portions 12 provided are simultaneously opened, and the granular material stored in the tank body 2 is allowed to naturally flow out from the outflow portions 12 simultaneously.

  At that time, the powder particles of each lot stored in the storage chambers 14a to 14f of the tank main body 2 are simultaneously transmitted from the six outflow portions 12 corresponding to the storage chambers 14a to 14f, respectively. In this way, by collecting the granular material flow that flows out from the plurality of outflow parts 12, the granular material of each lot in the tank body 2 can be effectively and uniformly distributed. As a result, the dispersion of the characteristics of the granular material taken out from the tank main body 2 can be advantageously reduced.

  In particular, when the granular material flows out of the tank main body 2, in the present invention, the inclination angle α of the tank main body 2 is the horizontal surface of the inner surface of the bottom wall on both sides sandwiching the ridge line where the outflow portion 12 is provided. The tank body 2 is inclined and arranged so as to be larger than the angle of repose of the charged granular material together with the inclination angle of the partition plates 10a to 10e with respect to the horizontal plane. With such an inclined arrangement, when the granular material in the tank body 2 flows out, the granular material is self-weighted from the tank body 2 without requiring any special device such as a mixing device using power. By this, it will be possible to effectively drain naturally.

  By the way, the present invention can also be advantageously implemented in the form as shown in FIG. In this case, appropriate valves 18 such as ball valves are separately provided for the plurality of outflow portions 12, and the individual valves 18 are automatically controlled to be opened and closed by an appropriate control device. Thus, the granular material can be simultaneously discharged from the plurality of outflow portions 12. And the granular material discharged | emitted from the several outflow part 12 through these each valve | bulb 18 is dropped on the belt conveyor 20 which is one of the current collecting means which collects these several granular material flows. In the form in which the plurality of powder flows are mixed, they are moved and transported to a target place.

  Thus, the outflow of the granular material from the plurality of outflow portions 12 is controlled by the automatic opening / closing operation of the valve 18 provided individually, so that the granular material from the tank main body 2 is controlled. There is a feature that simultaneous outflow becomes easier.

  In addition to the belt conveyor 20 illustrated in FIG. 9, as the current collecting means for collecting the plurality of powder flows from the plurality of outflow portions 12 provided below the tank main body 2, a well-known method is known. Various current collectors can be used, for example, a hopper or a chute, and the plurality of powder streams are merged and mixed to form a granular aggregate with little variation. As a result, the intended use or process is provided.

  As described above, the representative embodiments of the present invention have been described in detail. However, the embodiments are merely examples, and the present invention is not limited to specific descriptions according to such embodiments. It should be understood that this is not to be construed as limiting.

  For example, regarding the cross-sectional shape of the tank body 2, a rectangular cross-sectional shape is employed in the illustrated embodiment, but generally a polygonal shape of about octagonal to decagonal shape can be employed. Among them, in the present invention, a structure having a pentagonal cross section that can effectively perform storage and outflow of powder particles even in an inclined arrangement form is advantageously employed, an example of which is shown in FIG. 10.

  That is, in the various pentagonal cross-sectional shapes shown in FIG. 10, (a) shows a home base shape used in baseball, and a structure in which an outflow portion 12 is provided at the tip corner portion. In (b), the outflow portion 12 is provided at one ridge line portion in the regular pentagonal cross-sectional shape. Further, in (c), in the home base shape as described above, the tip portion is A structure is shown in which a narrow flat surface is provided, and an outflow portion 12 is provided on the narrow flat surface. Moreover, since the partition plates 10a (10b to 10e) provided in the tank main body 2 having these cross-sectional shapes are all cut out, a communication path between adjacent storage chambers is formed. With this, it is possible to overflow the granular material stored in the upstream storage chamber and to store the granular material in the lower storage chamber.

  Note that the number of the plurality of storage chambers 14a to 14f formed in the tank body 2 is not limited to six as illustrated, but the number of powder particles to be stored in the tank body 2 or 1 The size is determined as appropriate according to the amount per lot, and the size of the storage chamber is advantageously adopted as a size capable of storing one lot of powder particles as in the above example. However, it is appropriately selected according to the degree of change in the characteristics of the granular material to be input, the change in the lot amount, the degree of variation in allowable characteristics, and the like.

  Further, in order to facilitate the outflow of the granular material stored in each of the storage chambers 14a to 14f of the tank body 2, as described above, the inclination angle α is an angle larger than the repose angle of the granular material. It is desirable that the tank main body 2 is inclined so that the outflow of the granular material in each of the storage chambers 14a to 14f is a ridge line positioned at the lowermost portion if the tank main body 2 is inclined. This is possible if the inner surface of the bottom wall located on both the left and right sides of the (ridge line where the outflow portion 12 is disposed) is inclined. Furthermore, in order to facilitate the outflow of such a granular material, it is also possible to add a vibration device that vibrates the tank body 2. In addition, even if it exists in the inner surface of the lower end wall 4 of this tank main body 2, the surface of the both sides of the partition plates 10a-10e, and also the inner surface of the upper end wall 6, all are illustrated. Although it is effective to configure with vertical planes as described above, if those planes are inclined, it is possible for particles to flow out. In particular, in the present invention, these planes are horizontal to the horizontal plane. It is more effective if the inclination angle is set to be larger than the angle of repose of the granular material.

  Furthermore, even if it exists in the some outflow part 12 provided corresponding to each storage chamber 14a-14f in the ridgeline site | part located in the lowest part of the tank main body 2, the outflow part 12 in the lowest end position of each storage chamber 14a-14f. It is also possible to provide one or more further outflow portions corresponding to the size of each of the storage chambers 14a to 14f, and the number and size of the outflow portions 12 are provided. The arrangement interval and the like are appropriately selected according to the size and length of the tank body 2, the type of granular material, the amount taken out (outflow amount), the size of the granular material lot, and the like. .

  In addition, the plurality of outflow portions 12 provided in the tank main body 2 are simultaneously opened, and the powder particles of each lot stored in the tank main body 2 are respectively downward from the plurality of outflow portions 12. In the illustrated embodiment, the shutter 16 and the valve 18 are used as the outflow portion opening means that can be allowed to flow out. However, the present invention is not limited to such illustrated ones, and various known types are available. The opening device or the opening mechanism can be appropriately employed.

  And in the present invention, as the granular material to which the mixing method and the mixing apparatus as described above are applied, if the granular material is a plurality of lots sequentially put into the tank body 2, the type is particularly Although not questioned, for the purposes of the present invention, such a granular material having a characteristic difference between a plurality of lots, and when it is taken out from the tank body 2, variation in the characteristic difference is reduced. It is preferably applied to what is desired to be done. In particular, in the casting field, the present invention is suitably applied to RCS (resin coated sand) used for mold making, and the RCS characteristics of each production lot (batch) of RCS as such a granular material. Variations can be effectively reduced, so that the properties such as strength and disintegration of the mold to be molded can be advantageously made constant, which can greatly contribute to stable production of the mold. Of course, the present invention is also advantageously applied to other ordinary foundry sands where it is desirable that the characteristic variation is small.

  In addition, although not listed one by one, the present invention can be implemented in a mode with various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the invention.

  Examples of the present invention will be shown below to clarify the features of the present invention more specifically. However, the present invention is not limited by the description of such examples. Should also be understood.

  First, as an example of the present invention, a mixing test of RCS as a granular material was performed using a testing machine in which the rectangular tank body 2 shown in FIGS. The tank body 2 has a quadrangular cross-sectional shape with a side of 7 cm, the length in the longitudinal direction (the length of the ridgeline) is 26.6 cm, and the upper end corner is 2 cm high. Is cut off in the horizontal direction to form a granular material receiving portion 8, and the outflow portion 12 is constituted by a through hole having a diameter of 4.6 mm, and is the lowermost end of each of the storage chambers 14 a to 14 f It is provided at each position. The partition plates 10a to 10e are provided with a pitch of 3 cm. And such a tank main body 2 is installed in the inclined state which gives an angle ((alpha)) of 45 degrees with respect to a horizontal surface so that it may become more than the repose angle of RCS used as a sample.

  And RCS as a granular material prepares three types, A (brown), B (white), and C (red), which have different hues and masses, and put these three types of samples on the upper end of the tank body 2. The sample (RCS) is simultaneously supplied from the plurality of outflow portions 12 provided at the ridge line portion of the tank body 2 after the RCS: A → RCS: B → RCS: C is charged in order from the provided granular material receiving portion 8. And then collected and stored in a transparent hopper disposed below. When the mixed state in the hopper of the sample (RCS) thus obtained was observed from the outside, these three types of RCS were so effective that the hues of RCS: A, RCS: B and RCS: C could not be distinguished. It was found that they were mixed together.

  On the other hand, as a comparative example, a mixing test was performed in the same manner as described above using a conventional testing machine including a rectangular hopper arranged in the vertical direction. That is, after the above three types of RCS (A, B, C) are sequentially added, the sample (RCS) is caused to flow out from the rectangular bottom opening (1 cm × 1 cm) provided at the bottom of the hopper. When the mixed state was collected and accommodated in a transparent hopper and the mixed state was observed from the outside, the existence of brown, white and red areas corresponding to the three RCS hues was clearly seen from the bottom to the top. It was recognized that the effluent (mixture) was recognizable, and the mixing of these three RCSs was not sufficient.

  In addition, using a tester (example of the present invention) having a tank body 2 inclined and a structure similar to the above and a tester (comparative example) provided with a conventional vertical hopper, three types having different strengths and masses are used. For RCS (RCS1, RCS2, and RCS3), run out and mix in the same way as above, and measure the strength of the test piece obtained from the first half outflow, central outflow and second half outflow of the resulting mixture. Thus, the degree of mixing was evaluated.

That is, first, for each of the three types of RCS used here, five test pieces were prepared, their strength (bending strength) was measured, and the average value thereof was calculated. 0.7 N / cm ² , RCS2 was 627.2 N / cm ² , and RCS3 was 840.8 N / cm ² . In addition, for the sample in which the three types of RCS taken out from the testing machine as described above are mixed, five test pieces are prepared from the first half outflow part, the central outflow part, and the second half outflow part, And the intensity | strength was measured and the result of having calculated those average values is shown in following Table 1. In addition, it measured also about the mass of five test pieces obtained in each said part, those average values were calculated, and the result is shown in following Table 1. The test piece strength measurement method described above is as follows.

-Measurement of test piece strength-
Using RCS corresponding to each outflow part, JIS type test piece (width: 10 mm x thickness: 10 mm x length: 60 mm, firing time: 250 ° C. x 60 seconds) according to JIS-K-6910 And the bending strength was calculated | required about the obtained JIS type test piece by measuring the intensity | strength (N / cm < ² >) according to JACT test method: SM-1.

  As is clear from the results of Table 1, when the three types of RCS are mixed using a tester in which the tank body 2 is inclined as in the present invention example, the conventional vertical type is used. Compared to the comparative example in which three types of RCS are mixed using a tester equipped with a hopper, the strength and mass variation of the test piece obtained from the sample flowing out at each site is effective. From this, it is understood that, by adopting the mixing method according to the present invention, when mixing RCS having different characteristics, variation in characteristics can be advantageously reduced. Is done.

It is a front schematic explanatory drawing which shows an example of the square cylindrical tank main body used in this invention. It is a left side schematic explanatory drawing of the square cylindrical tank main body shown by FIG. It is a right-side schematic explanatory drawing of the square cylindrical tank main body shown by FIG. It is a plane schematic explanatory drawing of the square cylindrical tank main body shown by FIG. It is a VV cross-section schematic explanatory drawing in FIG. It is VI-VI cross-section schematic explanatory drawing in FIG. It is a VII-VII cross-sectional schematic explanatory drawing in FIG. It is a perspective explanatory view showing the combination form of the rectangular tubular tank main body and the shutter shown in FIG. It is a schematic explanatory drawing which shows an example of the mixing apparatus according to this invention. It is explanatory drawing equivalent to FIG. 6 which shows the other example of the square cylindrical tank main body used for this invention, (a)-(c) has shown the example from which all cross-sectional forms differ. .

Explanation of symbols

2 Tank body 4 Lower end wall 6 Upper end wall 8 Granule receiving part 10a-10e Partition wall 12 Outflow part 14a-14f Storage chamber 16 Shutter 16a, 16b Flat plate 16c Triangular plate 18 Valve 20 Belt conveyor

Claims (10)

  A rectangular tank body having a rectangular cross section is formed, and the interior is partitioned into a plurality of storage chambers by a plurality of partition plates, and the plurality of storage chambers communicate with each other in the upper part. In a state in which the rectangular tube is inclined and arranged such that its longitudinal direction is inclined upward with respect to a horizontal plane and one ridge line of the polygon is located at the lowermost portion in the transverse section, the rectangular tube A plurality of lots of powder particles sequentially through a powder particle receiving portion provided at the upper end of the cylindrical tank main body, so that a plurality of storage chambers in the tank main body have a lower storage chamber from an upper storage chamber. The plurality of storage units from the plurality of outflow portions respectively provided at the lowermost positions of the plurality of storage chambers in the ridge line portion positioned at the lowermost part of the rectangular tubular tank body. Indoor Stowed granule is provided brought simultaneously outflow respectively, the method for mixing granular material, characterized by being configured so as to be mixed.   The inclination angle of the rectangular cylindrical tank body with respect to the horizontal plane, the inclination angle of the partition plate with respect to the horizontal plane, and the inclination angle with respect to the horizontal plane of the bottom wall inner surfaces on both sides across the ridge line located at the bottom of the rectangular cylindrical tank body. Each of the powder particles is set so as to be larger than the angle of repose of the charged powder particles, and the powder particles are allowed to flow down naturally from the plurality of outflow portions. The mixing method of the granular material of Claim 1.   Each of the plurality of storage chambers is formed to have a size capable of storing one lot of powder particles to be stored, and the plurality of lots of powder particles are charged to the plurality of storage chambers. The method for mixing powder particles according to claim 1 or 2, wherein the particles are stored for each lot.   The method for mixing powder particles according to any one of claims 1 to 3, wherein the powder particles are foundry sand or resin-coated sand. A rectangular tank body having a rectangular cross section is formed, and the interior is partitioned into a plurality of storage chambers by a plurality of partition plates, and the plurality of storage chambers communicate with each other in the upper part. The tank body is inclined so that the longitudinal direction of the tank main body is inclined with respect to a horizontal plane and extends upward, and one ridgeline of the polygon is positioned at the lowest position in the cross section. The upper end of the tank body is provided with a granular material receiving portion for sequentially loading a plurality of lots of powder particles and sequentially storing them in a plurality of internal storage chambers from the upper side to the lower side. A powder storage tank in which a plurality of outflow portions are respectively provided at the lowermost positions of the plurality of storage chambers in the ridge line portion located at the bottom of
The plurality of outflow portions of the granular material storage tank are simultaneously opened so that the granular materials stored in the storage chambers in the tank body can be discharged downward from the plurality of outflow portions, respectively. The outflow part opening means,
An apparatus for mixing granular materials, comprising:   6. The apparatus for mixing granular materials according to claim 5, wherein each of the plurality of storage chambers is formed in a size to store one lot of powder particles to be stored.   Current collecting means for collecting a plurality of flows of the granular material respectively flowing out from the plurality of outflow portions of the granular material storage tank is further provided below the granular material storage tank. The mixing apparatus of the granular material of Claim 5 or Claim 6.   The powder collecting apparatus according to claim 7, wherein the current collecting means is configured by one or a combination of two or more of a hopper, a chute, and a belt conveyor.   9. The apparatus for mixing granular materials according to claim 5, wherein the outflow portion opening means is configured by valves disposed in the plurality of outflow portions, respectively. The said granular cylinder tank main body has a cross-sectional shape of a triangle, a square, or a pentagon, The mixing apparatus of the granular material as described in any one of Claim 5 thru | or 9 characterized by the above-mentioned.

Images