JP2008073573A - Particle mixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact natural falling type particle mixing device which enables a uniform mixing and a maintenance of a continuousness in the kinetic energy of particles discharged from a raw material supply hopper, and does not require a driving source. <P>SOLUTION: The particle mixing device 1 comprises a plurality of raw material supply hoppers 10 provided with an opening for discharging a pooled object in the lower part and pooling the particles inside, an opening and closing means 30 in the lower opening of the raw material supply hopper, and a mixing hopper 20 slenderized downward and provided with a discharge spout 21 in the lower part, and has a constitution that plural kinds of particles supplied from each raw material supply hopper are mixed while being slid off on the peripheral wall 25a of the mixing hopper 20. In the device, the discharge spout is provided at a position eccentric from the center of the mixing hopper in a planar view, two parallel tangent lines mutually opposed of the discharge spout are drawn perpendicularly to a straight line connecting each center of the mixing hopper and the discharge spout, and each raw material supply hopper is arranged in a region having a larger area among two large and small regions zoned and sandwiched with the parallel tangent lines. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a powder and particle mixing apparatus that mixes a plurality of types of powder and particles by natural dropping.

  Currently, when a synthetic resin molded product is manufactured, a master batch in which various functions are concentrated and supported on a synthetic resin as a base in order to impart or color various special physical properties to the synthetic resin molded product It is becoming increasingly common to manufacture by mixing. For example, when molding a colored synthetic resin molded product, conventionally, a so-called colored pellet prepared by mixing and kneading talc or pigment with a base material has been used. However, since the conventional colored pellets are obtained by adding a colorant such as a pigment directly to the base material, there are problems such as complicated addition amount and management. On the other hand, according to the master batch in which the colorant is concentrated and supported, there is an advantage that the addition amount of the colorant can be easily adjusted by adjusting the mixing amount. In addition, it is more advantageous in terms of cost to use a master batch which is a concentrated pellet than to add an additive directly to the base material.

  Under such circumstances, there has been a demand for a mixing device that can measure and supply a masterbatch and a base material to a synthetic resin molding machine at a specified mixing ratio and uniformly mix them. As a conventional mixing technique, various raw materials are put in a drum and mixed by rotating the drum, an air blender method in which various raw materials are dispersed and mixed by blowing air into the case, and Myboxes (static mixers) that drop various raw materials in the vertical direction and repeatedly pass through a branched path in the apparatus for mixing are the mainstream.

  However, the drum mixing method has a problem that it is difficult to reduce the size of the equipment and a drive source for the apparatus is necessary. In addition, when the rotation time of the drum becomes long, friction is generated between the inner wall of the drum and the raw material, and static electricity is generated. There was a problem in that one of the pellets adhered to the inner wall of the drum due to this static electricity, and the mixed pellets were classified again. In the air blender method, a device for generating air is separately required. If the particle diameter and specific gravity of the base material and the master batch are different, the dispersion effect by air is also different, and there is a possibility that uniform mixing cannot be performed. Moreover, there is a possibility that static electricity is generated when the inner wall of the case and each material collide with air vigorously. The inconvenience when static electricity occurs is the same as that of the drum type mixing method. Furthermore, since the my box is mixed by dropping in the vertical direction, it is necessary to increase the length in the vertical direction in order to mix uniformly. Further, by repeatedly passing through the branched path in the apparatus, static electricity due to friction is generated between the inner wall of the apparatus and the material as in the case of the drum type mixing method or the air blender method.

  Thus, Patent Document 1 discloses a mixing apparatus that does not require a drive source of the apparatus by being naturally dropped, and is compact but can be uniformly mixed. The granular material mixing apparatus of Patent Document 1 has an opening for discharging a reservoir on the lower surface, and is discharged at a central position in plan view below a plurality of (10) raw material supply hoppers arranged in parallel at the same height. A constricted (funnel-shaped) mixing hopper having an outlet is disposed, and the lower surface opening of each raw material supply hopper can be freely opened and closed by a mass feeder as an opening / closing means thereof. A plurality of types of powder particles supplied by being naturally dropped in a dispersed manner from each raw material supply hopper by the mass feeder collide between one inclined surface of the mixing hopper and the other inclined surface opposite to the mixed hopper, It is configured so that it can be mixed by falling while repeating rebounding. In order to ensure that the powder particles collide and rebound, the inclination angle of the slope of the mixing hopper is set to 45 ° C. or more.

JP-A-5-103961

  However, the powder and particle mixing apparatus described in Patent Document 1 uses a rebound from the slope of the mixing hopper to mix, but surrounds a plurality of raw material supply hoppers in the plan view with the outlets of the mixing hoppers. Are arranged in parallel. In this case, for example, from a raw material supply hopper at a position facing each other across the supply port of the mixing hopper in a plan view, that is, a position where the straight line connecting the center of each raw material hopper and the center of the discharge port of the mixing hopper intersects at 180 °. Particles that have been ejected and bounced off one slope collide head-on at the center of the mixing hopper and cancel each other's kinetic energy, so the continuity of kinetic energy is interrupted and they cannot collide with the other slope. There is a risk that uniform mixing cannot be achieved. In practice, for example, powder particles discharged from adjacent raw material supply hoppers collide with each other at an acute angle, such as powder particles discharged from each raw material supply hopper collide with each other at various angles. Many of the bodies collide head-on from a position of 180 °, and there are other powder particles forming a pair. Further, special opening / closing means (mass feeder) for discharging the powder particles in a dispersed manner is also required.

  Therefore, the problem to be solved by the present invention is that the kinetic energy of each granular material discharged from the raw material supply hopper is reduced while it is compact and does not require a drive source for the apparatus and is compact. An object of the present invention is to provide a powder and particle mixing device capable of uniformly mixing while maintaining.

  In order to solve the above-mentioned problem, the first invention has a plurality of raw material supply hoppers 10 having a reservoir discharge opening 12 in the lower part and storing the granular material P therein, and each of the raw material supply hoppers 10. An opening / closing means 30 capable of opening and closing the lower opening 12; and a mixing hopper 20 having a constricted peripheral wall 25 having a discharge port 21 at a lower end and an inner diameter decreasing from the upper side to the lower side. In the powder mixing apparatus 1 for mixing a plurality of types of powder P supplied from the hopper 10 while sliding along the peripheral wall 25 of the mixing hopper 20, a plurality of the raw material supply hoppers 10 are One of the two regions A and B in the mixing hopper 20 separated by a region X sandwiched by two parallel tangents L and L of the discharge port 21 of the mixing hopper 20 in plan view (A also Characterized by being arranged only in B) (see FIG. 6). In addition, since the granular material mixing apparatus 1 which concerns on this invention is a type which mixes several types of granular material P supplied from each raw material supply hopper 10 along the peripheral wall 25 of the mixing hopper 20, sliding down. The inclination angle of the peripheral wall 25 of the mixing hopper 20 is not particularly limited.

  According to a second aspect of the present invention, the discharge port 21 of the mixing hopper 20 is provided at an eccentric position shifted from the central position of the mixing hopper 20 by a predetermined distance in plan view. Yes. In addition, two parallel tangents L and L opposite to each other of the discharge port 21 are drawn at right angles to a straight line C connecting the center of the mixing hopper 20 and the center of the discharge port 21, and a plurality of the respective raw materials are drawn. The supply hopper 10 is applied only to the region A having the larger area out of the two regions A and B separated by the region X sandwiched by two parallel tangents L and L of the discharge port 21 facing each other. They are arranged (see FIG. 7).

  A third invention is characterized in that, in the granular material mixing apparatus 1 according to the second invention, the discharge port 21 of the mixing hopper 20 is provided at the periphery of the maximum inner diameter of the mixing hopper 20 in a plan view. To do.

  4th invention is the granular material mixing apparatus 1 which concerns on any one of 1st-3rd invention, The said mixing hopper 20 is cone shape, It is characterized by the above-mentioned.

  5th invention is the granular material mixing apparatus 1 which concerns on the invention in any one of 1st-4th. The granular material mixed in the mixing hopper 20 by communicating with this mixing hopper 20 below the said mixing hopper 20 A stirring hopper 50 for further stirring and mixing P is provided.

  According to the first aspect of the present invention, when the opening / closing means that closes the lower opening of the raw material supply hopper is opened, the granular material spontaneously falls and is discharged and supplied from the lower opening of each raw material supply hopper. It slides down along the peripheral wall, and the flow of each granular material merges into one at the discharge port and is mixed with each other. Therefore, the device drive source is not required, and a long sliding path is not required, so that the device can be made compact. Further, at this time, since each of the plurality of raw material supply hoppers is arranged only in one region divided by two parallel tangents facing each other of the discharge port of the mixing hopper in plan view, Each granular material does not collide front. That is, as shown in FIG. 6, two straight lines connecting the raw material hoppers 10 and 10 and the center of the discharge port 21 are also taken as an example of the relationship between the raw material supply hoppers 10 and 10 located at the farthest positions. Is not 180 °. Therefore, the powder particles discharged and supplied from the raw material supply hoppers collide with each other while maintaining their continuity without canceling each kinetic energy. As a result, when each granular material collides and joins from various angles and merges into one, the kinetic energy of each granular material becomes energy that enters (mixes) into the flow of the other granular material. Well mixed.

  Thus, the granular material mixing apparatus according to the present invention focuses on the installation position of each raw material supply hopper, that is, the angle at which the granular materials collide with each other, and the granular material follows the peripheral wall of the mixing hopper. And just let it slide down naturally. Therefore, for example, it is not necessary to discharge the powder particles in a dispersed manner from the raw material supply hopper, and the configuration of the opening / closing means can be simplified.

  According to the second invention, the outlet of the mixing hopper is eccentric, and each raw material supply hopper is arranged only in the larger area. Thus, for example, even in the raw material supply hopper 10 provided at the position shown in FIG. 6, the discharge port 21 is eccentric, so that the raw material supply hopper 10 to the discharge port 21 are well illustrated as shown in FIG. 7. And the kinetic energy of each granular material P when it reaches the discharge port 21 increases accordingly. Therefore, since the energy with which each granular material is mixed with other granular materials is increased, more uniform mixing is possible.

  In the third invention, by providing the discharge port at the periphery of the maximum inner diameter of the mixing hopper in a plan view, the kinetic energy of each granular material when reaching the discharge port is maximized in the design of the mixing hopper. And can be mixed most efficiently. This also forms a vertical wall in part of the mixing hopper. Therefore, even if the granular material sliding down the peripheral wall passes over the discharge port due to its momentum, the vertical wall is blocked from passing in the opposite direction, so that the loss of kinetic energy of each granular material can be suppressed as much as possible. . Further, at this time, a large space is formed below the peripheral wall (inclined wall) facing the vertical wall of the mixing hopper. Thus, for example, by installing a drive unit of the opening / closing means in the space, the powder and particle mixing device can be made compact.

  According to the fourth invention, since the mixing hopper has a conical shape, the powder particles sliding down from various angles can be smoothly and efficiently merged at the discharge port and reliably mixed. That is, if the mixing hopper has a corner on the peripheral wall, for example, a quadrangular pyramid, the powder particles being slid down there will be concentrated before they reach the discharge port and will not mix well. Can be avoided.

  Further, since the mixing hopper has a conical shape, as shown in FIG. 8, each granular material discharged and supplied from each raw material supply hopper and sliding down the peripheral wall of the mixing hopper is linearly discharged at the beginning. However, when it reaches the vicinity of the discharge port, it slides down while rotating the peripheral wall around the discharge port. The principle of such a sliding track is not necessarily clear, but it is considered that the direction of the load acting on the powder is complicated due to the eccentric outlet and the conical mixing hopper. . And by adding such rotational force, each granular material can be mixed more uniformly. Incidentally, Patent Document 1 discloses that the mixing hopper has a conical shape, but does not effectively use the rotational force as described above.

  According to the fifth invention, since the stirring hopper is provided below the mixing hopper 4, the powder P mixed in the mixing hopper can be further mixed in two stages in the stirring hopper, and each powder The body can be mixed more uniformly.

  Hereinafter, embodiments of the powder and particle mixing apparatus according to the present invention will be described with reference to FIGS. 1 to 5 and FIGS. 6 to 8 as appropriate, but the present invention is not limited thereto, and the gist of the present invention. Various changes can be made without changing the range. FIG. 1 is a side view of a powder and particle mixing apparatus. FIG. 2 is a cross-sectional view taken along line AA in FIG. 3, that is, a longitudinal front view of the powder particle mixing device. FIG. 3 is a plan view of the granular material mixing apparatus. FIG. 4 is an enlarged view of a main part showing a mechanism for discharging and supplying the granular material from the raw material supply hopper by opening and closing by the opening and closing means. FIG. 5 is a plan view showing a state in which each granular material discharged and supplied from each raw material supply hopper slides down toward the discharge port.

  As shown in FIG.1 and FIG.2, the granular material mixing apparatus 1 of this embodiment is the multiple raw material supply hopper 10 which stores the granular material P inside, and the multiple types discharged | emitted and supplied from each raw material hopper 10 A mixing hopper 20 that mixes the powder particles P into one, an opening / closing means 30 that can freely open and close the lower surface opening 12 of each raw material supply hopper 10, a cover body 40 that covers the outer periphery of the mixing hopper 20 and the opening / closing means 30, It comprises an agitation hopper 50 for further agitating and mixing the mixed powder particles from the mixing hopper 20, and a storage unit 60 for storing the mixed powder particles P.

  The raw material supply hopper 10 is a transparent synthetic resin molded product, and is formed by integrally standing up a cylinder having upper and lower openings 11 and 12 on a thin disk-shaped base 13. The lower surface opening 12 functions as a discharge port for discharging and supplying the granular material P stored therein to the mixing hopper 20. In addition, the peripheral part of each raw material supply hopper 10 in the base 13 is made thick to improve the strength.

  Three raw material supply hoppers 10 in this embodiment are formed as shown in FIG. These three raw material supply hoppers 10 are orthogonal to a straight line C connecting the center of the mixing hopper 20 and the center of the discharge port 21 of the mixing hopper 20 in a plan view, and are parallel to each other of the discharge port 21. Of the two large and small regions separated by the region X sandwiched between the tangent lines L and L, they are arranged only in the region with the larger area (see FIGS. 3 and 7). Specifically, the three raw material supply hoppers 10 have the same vertical height position and length dimension, and are arranged at equal intervals along the upper surface opening periphery of the mixing hopper 20. One raw material supply hopper 10 stores one type of granular material P.

  Further, as shown in FIG. 3, the inner diameters of the raw material supply hoppers 10 are different. This is to adjust the mixing ratio of various powders P used as raw materials and to adjust the impact energy according to the physical properties such as the shape, bulk specific gravity, and fluidity (sliding properties) of the various powders P. Is set. In particular, from the viewpoint of adjusting the mixing ratio of the various granular materials P, each raw material supply hopper 10 also functions as a measuring instrument. Specifically, if the inner diameter of the raw material supply hopper 10 is increased, the amount of storage increases and the amount of discharged particulate matter per unit time also increases. If the inner diameter of the raw material supply hopper 10 is reduced, the opposite is true. There are a wide variety of setting standards for the inner diameter of the raw material supply hopper 10, for example, by adjusting the discharge amount per unit time, and increasing the inner diameter of the raw material supply hopper 10 for the granular material to increase the mixing ratio, The inner diameter of the raw material supply hopper 10 for a granular material for reducing the mixing ratio is reduced. When the powder mixing device 1 is of a batch type, the inner diameter of the raw material supply hopper 10 for a granular material having a large diameter (length) so that the powder P in each raw material supply hopper 10 is simultaneously emptied. And the inner diameter of the raw material supply hopper 10 for a granular material having a small diameter is made small. Alternatively, in order to adjust the kinetic energy when reaching the discharge port 21, the inner diameter of the raw material supply hopper 10 for a granular material P having a distorted shape (poor fluidity) or a granular material having a small bulk specific gravity is increased. The inner diameter of the raw material supply hopper 10 for a granular material P having a smooth shape (good fluidity) and a large granular specific gravity is reduced. For example, the reference may be set by paying attention to one of the references, or may be set by involving a plurality of references.

  The mixing hopper 20 is a transparent synthetic resin molded product and has a conical shape whose inner diameter decreases from the upper side to the lower side. Each powder P discharged from the raw material supply hopper 10 is supplied to the upper surface thereof. There is an opening for receiving, and an outlet 21 for discharging the powder P mixed at the lower end is opened. Therefore, the upper surface opening of the mixing hopper 20 becomes the maximum inner diameter of the mixing hopper 20, and the discharge port 21 becomes the minimum inner diameter. As is well shown in FIG. 3 and the like, the discharge port 21 is formed at an eccentric position shifted from the center position of the mixing hopper 20 by a predetermined distance in plan view. In this embodiment, the mixing hopper 20 is provided at the lower peripheral edge of the upper surface opening which is the maximum inner diameter. As a result, the peripheral wall 25 of the mixing hopper 20 has a shape in which an inclined wall 25a and a vertical wall 25b are formed, as shown in FIG. 1, and a relatively wide open space below the inclined wall 25a. Is formed. Therefore, a vertically long guide cylinder 26 that guides and supports the vertical movement of a plunger 33 of the opening / closing means 30 described later is integrally formed on the inclined wall 25 a of the mixing hopper 20 at a position directly below each raw material supply hopper 10. By forming in this way, the drive unit 32 of the opening / closing means 30 and the like can be arranged below the inclined wall 25a so that the open space can be used effectively, and the powder mixing device 1 can be made compact. In addition, a vertically long cylindrical throttle 22 is integrally provided from the discharge port 21 of the mixing hopper 20, and a flange 24 that extends outward in the circumferential direction is integrally formed at the upper end of the mixing hopper 20. ing. Note that the vertical wall 25b here does not necessarily mean that it is exactly 90 °, but includes an angle close to vertical. Specifically, a wall having an inclination angle of about 85 to 90 ° with respect to a horizontal plane is referred to as a vertical wall.

  As the opening / closing means 30 for opening and closing the lower surface opening 12 of the raw material supply hopper 10 in this embodiment, a plug member 31 that moves up and down by a solenoid is applied. Specifically, a conical plug member 31 is attached to the tip of a round bar-shaped plunger 33 that can be moved up and down by the drive unit 32. The lower portion of the plunger 33 has a small diameter, and the plunger 33 is biased upward (in the protruding direction) by inserting the compression coil spring 34 into the small diameter portion. In the cross-sectional view in FIG. 2, members such as a fixed iron core and a coil incorporated in the drive unit 32 of the solenoid 30 are omitted.

  The cover body 40 is a cylindrical transparent synthetic resin molded product whose upper and lower surfaces are open, and flanges 41 and 42 extending outward in the circumferential direction are integrally formed at the upper and lower ends of the cylinder.

  The stirring hopper 50 is a transparent synthetic resin molded product and has a conical shape with an open bottom surface. The upper surface of the stirring hopper 50 is substantially closed by a thin disk-shaped top plate 51, but the throttle portion 22 is formed by an opening 52 formed only at a position facing the throttle portion 22 following the discharge port 21 of the mixing hopper 20. Is communicated internally with the mixing hopper 20. Further, a flange 53 that extends outward in the circumferential direction is integrally formed at the lower end of the stirring hopper 50. The storage portion 60 is also a transparent synthetic resin molded product, and has a vertically long cylindrical shape with at least an upper surface opened, and a flange 61 that extends outward in the circumferential direction is integrally formed at the upper end thereof.

  Then, the plunger 33 of the solenoid 30 is inserted into each guide tube 26 of the mixing hopper 20, and the material is formed on the upper surface of the mixing hopper 20 with the bottom surface opening 12 of the raw material supply hopper 10 aligned with the plug member 31 of each solenoid 30. The base 13 of the supply hopper 10 is covered. Next, in this state, the cover body 40 is covered so as to cover the outer periphery of the mixing hopper 20 and the solenoid 30, and the base 13 of the raw material supply hopper 10, the upper end flange 24 of the mixing hopper 20, and the upper end flange 41 of the cover body 40 are respectively Bolts 3 are inserted through fastening holes 2 that are formed at four locations on four sides at intervals, and the raw material supply hopper 10, the mixing hopper 20, and the cover body 40 are fixed.

  Similarly, with the throttle portion 22 of the mixing hopper 20 and the opening 52 of the top plate 51 of the stirring hopper 50 aligned, the stirring hopper 50 is applied below the mixing hopper 20 and the like, and the lower end flange 42 of the cover body 40 and The cover body 40 and the stirring hopper 50 are fixed by inserting the bolts 3 into the fastening holes 2 formed at four positions on each side of the top plate 51 of the stirring hopper 50 at equal intervals. At this time, the solenoid 30 is placed on the top plate 51 of the stirring hopper 50. Both the stirring hopper 50 and the reservoir 60 are fixed by inserting bolts 3 into the fastening holes 2 between the lower end flange 53 and the upper end flange 61.

  The granular material P to be mixed in the present granular material mixing device 1 is not particularly limited as long as it is used by mixing two or more kinds of raw materials with each other. Synthetic resin, metal, food, medicine, and wood Plants such as can be used. In addition, as long as each is a solid material, the size and shape thereof are not particularly limited, such as granular, powdery, and pellety. For example, in order to produce a colored synthetic resin molded article, it can be used when a pellet-like master batch as a colorant and a pellet-like base material are mixed. Moreover, the mixed granular material which mixed each granular material P can be united by melting and pressing, or can be used as it is as a mixed powder, and can be appropriately selected depending on its intended use and intended purpose. Good. In this embodiment, a pellet-shaped synthetic resin base material is used for a raw material supply hopper having a large inner diameter, a pellet master batch is used for a raw material supply hopper having a medium inner diameter, and additive powder is used for a raw material supply hopper having a small inner diameter. Filled.

  Next, the mechanism by which each granular material P is mixed will be described. First, as shown in FIGS. 1 and 2, when the powder mixing device 1 is not in use, the plunger 33 of the solenoid 30 is urged upward by the compression coil spring 34, so that the plunger 33 is fixed to the upper end of the plunger 33. The stopper member 31 thus closed closes the lower surface opening 12 of the raw material supply hopper 10. In this state, as shown in FIG. 4A, each raw material supply hopper 10 is filled with various types of powder P one by one from the upper surface opening 11 thereof. When the solenoid 30 is energized, the plunger 33 descends downward against the urging force of the compression coil spring 34 by the attractive force of the drive unit 32 as shown in FIG. 4B, and is fixed to the upper end of the plunger 33 accordingly. The plug member 31 thus separated is separated from the raw material supply hopper 10, the lower surface opening 12 is opened, and the granular material P stored in the raw material supply hopper 10 is discharged and supplied in a naturally falling state by its own weight.

  As shown in FIG. 5, the various granular materials P discharged and supplied from the raw material supply hoppers 10 slide down toward the discharge port 21 along the peripheral wall 25 (more precisely, the inclined wall 25 a) of the mixing hopper 20. And merge together at the discharge port 21 (strictly, immediately above the discharge port 21). At this time, each raw material supply hopper 10 is divided into two regions in the mixing hopper 20 divided by a region X sandwiched by two parallel tangent lines L and L of the discharge port 21 of the mixing hopper 20 in plan view. Among them, by disposing only in one region, each granular material P collides with each other at an acute angle, that is, each granular material P does not collide front, and each granular material P moves. Energy flows collide with each other without interruption. Therefore, the powder particles P having different directions of kinetic energy collide with each other, so that each kinetic energy acts as energy mixed with other powder particles P and is well mixed. In addition, as shown in FIG. 8, each granular material P slides linearly toward the discharge port 21 at the beginning when the powder P is discharged and supplied from the raw material supply hopper 10 (above the mixing hopper 20). Immediately before reaching the outlet 21 (lower region of the mixing hopper 20), it slides down around the peripheral wall 25 around the discharge port 21. Therefore, even when this round energy is applied, the mixture is further uniformly mixed. Furthermore, since the opposing surface of the inclined wall 25a from which each granular material P slides down is a vertical wall 25b, even if each granular material P jumps over the upper surface of the discharge port 21, the vertical wall Since it is dammed by colliding with 25b, the loss of kinetic energy is suppressed.

  Thus, the granular material P mixed in one by the discharge port 21 passes through the expansion | squeezing part 22 connected to this from the discharge port 21 spirally, and is introduce | transduced into the stirring hopper 50. FIG. The squeezing unit 22 has a function of once rectifying while maintaining the rotational motion of the mixed powder particles, whereby the mixed powder particles are smoothly introduced into the stirring hopper 50.

  The mixed powder particles introduced from the squeezing part 22 slide down downward while circling along the peripheral wall 54 of the stirring hopper 50. Accordingly, the mixed powder and particles are further uniformly dispersed and mixed. That is, the granular material mixing apparatus 1 of this embodiment mixes each granular material P in two stages.

  Finally, the mixed powder particles mixed by the stirring hopper 50 are stored in the storage unit 60 provided at the lowermost part of the powder particle mixing device 1. And what is necessary is just to take out the mixed granular material stored by the storage part 60, and to produce various products.

  Next, the modification etc. of the powder / particles mixing apparatus 1 in this embodiment are demonstrated. First, the number of raw material supply hoppers 10 formed is not particularly limited as long as it is two or more. Each raw material supply hopper 10 stores the powder P, which is one kind of raw material, and may be formed according to the number of the powder P to be mixed. Moreover, one type of granular material P can be divided and stored in a plurality of raw material supply hoppers 10.

  In order to maximize the kinetic energy of the powder P that slides down the peripheral wall 25 of the mixing hopper 20, the raw material supply hopper 10 is preferably provided at a position as far as possible from the discharge port 21 of the mixing hopper 20. In other words, it is preferable that the mixing hopper 20 is provided at the periphery of the upper surface opening which is the maximum inner diameter. However, the present invention is not limited to this, and each raw material supply hopper 10 is mixed by a region X sandwiched by two parallel tangents L and L facing each other of the discharge port 21 of the mixing hopper 20 in a plan view. If it is arranged only in one region of the hopper 20, it may be provided closer to the center. In particular, if it is a granular material having a high specific gravity and good fluidity, it may be preferable to provide it closer to the center depending on the kinetic energy of other granular materials.

  Moreover, although it is preferable that each raw material hopper 10 is provided at equal intervals, it is not limited to this, As long as each granular material P can collide and be mixed, the one part or all part is adjacent. You may do it. Basically, the kinetic energy of each granular material can be adjusted by setting the sliding distance, that is, the distance between the discharge port 21 and each raw material hopper 10, but the height position of the raw material supply hopper 10 is strictly speaking. It can also be adjusted by changing the height position of the lower surface opening 12 of the raw material supply hopper 10 and setting the height at which the powder P is discharged and supplied.

  The raw material supply hopper 10 may be disposed not only above the mixing hopper 20 as in the above embodiment, but also disposed outside the mixing hopper 20. In this case, the opening 12 for discharging the granular material P in the raw material supply hopper 10 may be formed vertically in the lower part of the raw material supply hopper 10 and in the upper part of the peripheral wall 25 of the mixing hopper 20.

  The location where the discharge port 21 is formed in the mixing hopper 20 is not particularly limited as long as it is decentered from the center of the mixing hopper 20 in plan view, but the case where the discharge port is formed at the central position of the mixing hopper 20. When it is assumed, it is preferable that the center outlet and the eccentric outlet are decentered more than the adjacent distance. Further, as a numerical standard, it is preferable that the distance between the center of the mixing hopper 20 and the center of the discharge port 21 is at least 10% or more with respect to the inner diameter of the upper surface opening of the mixing hopper 20. This is because if the formation position of the discharge port 21 is on the center side of these standards, the effect of decentering may not be exhibited effectively.

  Further, the inner diameter of the discharge port 21 is at least 80% or less, preferably 60% or less, more preferably 40% or less, and most preferably 20% or less with respect to the inner diameter of the upper surface opening of the mixing hopper 20. If the difference between the inner diameter of the discharge port 21 and the top opening of the mixing hopper 20 is too small, the inclination angle of the peripheral wall 25 of the mixing hopper 20 becomes too steep to increase the sliding speed of the granular material P, and Since the collision angle in the vertical direction of the powder particles P becomes an acute angle, the energy that intermingles with each other is not effectively exhibited, and uniform mixing becomes difficult, or the powder particles P are discharged before the powder particles P collide with each other. In the first place, there is a problem that mixing becomes impossible. On the other hand, if there is a certain difference between the inner diameter of the discharge port 21 and the upper surface opening of the mixing hopper 20, the kinetic energy of the powder P can be efficiently collected in one place. Further, the lower limit of the inner diameter of the discharge port 21 with respect to the inner diameter of the upper surface opening of the mixing hopper 20 is at least 2%, preferably 5% or more, more preferably 10% or more. If the difference between the inner diameter of the discharge port 21 and the opening of the upper surface of the mixing hopper 20 is too large, the inclination angle of the peripheral wall 25 of the mixing hopper 20 becomes too gentle, and the granular material having poor fluidity becomes the peripheral wall 25 of the mixing hopper 20. There is a problem that it stops in the middle or the area of the discharge port 21 is small and the powder P is clogged.

  In this connection, the present invention is a mixing device in which the granular material P slides along the peripheral wall 25 of the mixing hopper 20, so that basically the inclination angle of the inclined wall 25a of the mixing hopper 20 is particularly Although not limited, 20 to 70 degrees is preferable as a fixed design standard with respect to a horizontal plane, 30 to 60 degrees is more preferable, and 40 to 50 degrees is most preferable. If the inclination angle is within this range, the effect of the present invention can be exhibited. Further, when the number of raw material supply hoppers 10 formed is relatively small, the mixing hopper 20 may be polygonal. In this case, in order to avoid that each granular material P joins at the corner | angular part of the surrounding wall 25, it is preferable to design in the shape which can ensure one plane with respect to the sliding surface of one granular material P. FIG.

  In the above embodiment, the plug member 31 using a solenoid is applied as the opening / closing means 30 of the lower surface opening 12 of the raw material supply hopper 10, but the present invention is not limited to this as long as the opening 12 can be opened and closed. . For example, a shutter member that slides in the left-right direction or a lid member that is pivotally supported on one side and whose other side rotates up and down around the pivot can be used.

  Further, the throttling part 22 may be eliminated and the mixing hopper 20 and the stirring hopper 50 may be directly communicated with each other, or the agitation hopper 50 may be eliminated and the mixing hopper 20 and the storage part 60 may be directly communicated with each other. Further, the cover body 40 is not necessarily provided.

  The upper surface opening 11 of the raw material supply hopper 10 may be a batch type in which various types of granular materials P are filled each time as a free end, or the raw material supply hopper 10 is continuously connected to a granular material P storage tank provided separately. It can also be a continuous feed system. Further, the storage unit 60 may also be provided with an opening for taking out the mixed powder stored therein, so that a necessary amount of the mixed powder can be taken out, or the storage unit 60 and the molding machine can be removed. You may make it connect and supply a mixed granular material to a sequential molding machine.

It is a side view of a granular material mixing apparatus. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a top view of a granular material mixing apparatus. It is a principal part enlarged view which shows the discharge mechanism of a granular material. It is a top view which shows the state in which a granular material slides down toward a discharge port. It is a top view which shows the arrangement position of a raw material supply hopper. It is a top view which shows the arrangement position of the raw material supply hopper in the state which made the discharge port eccentric. It is a side view which shows the sliding locus | trajectory of a granular material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Powder mixing device 10 Raw material supply hopper 12 Lower surface opening 20 Mixing hopper 21 Discharge port 22 Restriction part 25 Perimeter wall 26 Guide cylinder 30 Opening and closing means 31 Plug member 40 Cover body 50 Stirring hopper 60 Storage part C Center and discharge port of mixing hopper A straight line connecting the center of the L

Claims (5)

A plurality of raw material supply hoppers having an opening for discharging a stored substance at the lower part and storing powder particles therein,
Opening and closing means that can freely open and close the lower opening of each raw material supply hopper,
A mixing hopper having a discharge port at the lower end and having a constricted peripheral wall whose inner diameter decreases from the upper side to the lower side,
A granular material mixing device for mixing a plurality of types of granular materials supplied from the raw material supply hoppers while sliding down along the peripheral wall of the mixing hopper,
Only one of the two regions in the mixing hopper divided by a region sandwiched by two parallel tangents facing each other of the discharge port of the mixing hopper in a plan view. A powder and particle mixing apparatus characterized by being arranged in the above. The discharge port of the mixing hopper is provided at an eccentric position shifted by a predetermined distance from the center position of the mixing hopper in plan view,
Two parallel tangents facing each other of the discharge port are drawn at right angles to a straight line connecting the center of the mixing hopper and the center of the discharge port, and a plurality of the raw material supply hoppers are arranged relative to the discharge port. The granular material mixing apparatus according to claim 1, wherein the powder and particle mixing apparatus is arranged only in a region having a larger area among two large and small regions separated by a region sandwiched by two parallel tangents facing each other.   3. The powder and particle mixing apparatus according to claim 2, wherein a discharge port of the mixing hopper is provided at a periphery of the maximum inner diameter of the mixing hopper in a plan view.   The powder and particle mixing apparatus according to any one of claims 1 to 3, wherein the mixing hopper has a conical shape. 5. The stirring hopper that further communicates with the mixing hopper and further agitates and mixes the powder particles mixed in the mixing hopper is provided below the mixing hopper. 6. Powder and particle mixing equipment.

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