JP2013049575A - Quantitative feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quantitative feeding device capable of feeding a powder-particle material steady even if it is a material that becomes massive easily when gathered closely.SOLUTION: A quantitative feeding device 10 for feeding a powder-particle material with a steady speed includes a container 12 containing a powder-particle material, a rotary table 14 having on its upper face 14a an annular groove 14b filled with a powder-particle material, and a scraper 16 for scraping away the powder-particle material in the annular groove 14b of the rotary table 14, wherein the rotary table 14 is arranged to be rotatable in such a way that a part of the annular groove 14b overlaps with a part of the container 12 and the rest of the annular groove 14b extends from the container 12, and the scraper 16 rotates in such a direction that the powder-particle material filled into the annular groove 14b at the inside of the container 12 is scraped away toward the outside of the rotary table 14 at the outside of the container 12, and the face of the powder-particle material in the annular groove formed by scraping together the powder-particle material with the scraper 16 has a sloping shape so as to be inclined in the radial direction of the rotary table 14.

Description

  The present invention relates to a quantitative supply device for supplying a granular material at a stable supply rate (a supply amount per unit time).

  2. Description of the Related Art Conventionally, a quantitative supply device is known in which a granular material is filled in an annular recess formed on a rotary table, and the granular material in the annular recess is scraped by a scraper.

  For example, the quantitative supply device described in Patent Documents 1 and 2 scrapes out the container in which the powder is accommodated, the rotary table having an annular recess filled with the powder, and the powder in the annular recess. And a scraper. The rotary table is rotatably arranged such that a part of the annular recess is located inside the container and the remaining part is located outside the container. Thereby, the granular material inside a container is filled in the annular recessed part of a rotary table, and is conveyed outside a container. The granular material conveyed to the outside of the container is scraped out by the scraper from the annular recess toward the chute located outside the rotary table. The granular material scraped out from the annular recess to the chute by the scraper is supplied to a desired place.

Japanese Utility Model Publication No. 5-85435 Japanese Utility Model Publication No. 63-1819

  By the way, in the case of the fixed-quantity supply apparatus described in patent documents 1 and 2, since it is the composition where a granular material hits a fixed scraper, the following problems may occur.

  In the case of a granular material having high fluidity such as salt, the granular material is scraped out of the annular recess without staying in the scraper. That is, the powder particles smoothly move to the outside of the annular recess along the surface of the scraper.

  However, for example, in the case of a granular material that has a low fluidity in a stationary state, such as wheat flour, especially a granular material that tends to agglomerate when densely packed, conditions such as the rotational speed of the rotary table, the surface roughness of the scraper, temperature, humidity, etc. In some cases, the granular material does not move smoothly along the surface of the scraper, and therefore tends to stay on the scraper. When staying in the scraper, the powder particles may gather densely on the scraper and eventually become agglomerated.

  When the granular material is agglomerated on the scraper, the scraping amount of the granular material per unit time of the scraper becomes unstable. For example, a lump of granular material partially and intermittently leaves the scraper and moves outside the annular recess. Naturally, when the scraping amount of the powder particles of the scraper becomes unstable, the quantitative supply device cannot supply the particles at a stable supply speed.

  Then, this invention makes it a subject to stabilize the supply speed | rate of the granular material even if it is a granular material which is easy to become a lump when gathering densely in a fixed amount supply apparatus.

  In order to solve the above-described problem, according to the first aspect of the present invention, there is provided a quantitative supply device for supplying a granular material at a stable supply rate, a container for accommodating the granular material, and a powder A rotary table having an annular groove on its upper surface filled with granules, and a scraper that scrapes out powder particles in the annular groove of the rotary table, and a part of the annular groove is located inside the container, and the remainder of the annular groove The rotary table is rotatably arranged so that the portion is located outside the container, and the scraper rotates in a direction to scrape the powder particles filled in the annular groove inside the container toward the outside of the rotary table. And the fixed quantity supply apparatus provided with the shape where the surface of the granular material in the annular groove formed by being scraped off by the scraper is an inclined surface when viewed in the radial direction of the rotary table. Provided.

  According to the second aspect of the present invention, the scraper has a flat plate shape and is disposed so as to enter the annular groove by rotating about a rotation center line parallel to the flat plate surface. A metering device according to one aspect is provided.

According to a third aspect of the present invention, there is provided the quantitative supply device according to the first aspect, wherein the scraper has a spherical shape and is disposed so that a part thereof is positioned in the annular groove.

  According to the 4th aspect of this invention, the fixed_quantity | feed_rate supply apparatus as described in a 3rd aspect is provided with the surface of a scraper provided with a some recessed part or convex part.

  According to the fifth aspect of the present invention, there is provided the quantitative supply device according to the fourth aspect, wherein the concave portion on the surface of the scraper is a groove having an open end.

  According to the sixth aspect of the present invention, any one of the first to fifth aspects further includes a cover member that prevents the powder particles scraped from the annular groove by the scraper from scattering to the center side of the rotary table. A quantitative supply device according to claim 1 is provided.

  According to the present invention, the granular material in the annular groove of the rotary table is scraped out from the annular groove by the rotation of the scraper. Therefore, the powder particles cannot remain in the scraper, that is, the powder particles do not gather densely in the scraper, and the powder particles are suppressed from being agglomerated by the scraper. As a result, the scraping amount of the granular material per unit time of the scraper is stabilized, and the quantitative supply device can supply the granular material at a continuously stable supply speed.

The figure which shows schematically a part of structure of the fixed quantity supply apparatus which concerns on Embodiment 1 of this invention. AA line sectional view of FIG. BB sectional view of FIG. Illustration for explaining the role of rollers The figure which shows schematically a part of structure of the fixed quantity supply apparatus which concerns on Embodiment 2 of this invention. DD sectional view of FIG. The figure which shows the scraper of an Example, and the scraper of a comparative example The figure which shows the granular material sequentially scraped by the scraper of an Example, and the scraper of a comparative example The figure which shows the scraper of the comparative example arrange | positioned with different attitude | positions The figure which shows the scraper of another form which concerns on this invention The figure which shows schematically a part of structure of the fixed quantity supply apparatus which concerns on another embodiment. The figure which shows schematically a part of structure of the fixed quantity supply apparatus which concerns on another embodiment.

(Embodiment 1)
FIG. 1 schematically shows a part of the configuration of a quantitative supply device according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIG. 1, the quantitative supply device 10 includes a cylindrical container 12 that stores powder particles, a rotary table 14 that includes an annular recess (annular groove) filled with the particles, and powder in the annular groove. It has a scraper 16 that scrapes out the particles, and a chute 18 that collects the powder particles scraped out by the scraper 16. In the drawing, the granular material is drawn by dot hatching.

  The cylindrical container 12 is a cylindrical container, and accommodates powder particles therein.

  The rotary table 14 is a disk-shaped table, and is connected to a rotary shaft 20 that rotates about a rotation center line C2 parallel to the center line C1 of the cylindrical container 12. The rotation center line C2 of the turntable 14 extends in the vertical direction, for example. The rotating shaft 20 is rotationally driven at a constant rotational speed via a gear (not shown), for example, by a motor (not shown). As the rotary shaft 20 rotates, the rotary table 14 rotates.

  The turntable 14 also includes an annular groove 14b formed on its upper surface 14a so as to go around the rotation center line C2. As shown in FIG. 2, the annular groove 14b is formed as a recess having a semicircular cross section. As shown in FIG. 1, the annular groove 14b can also be an outer peripheral side upper surface portion 14a ′ sandwiched between the peripheral edge 14c and the annular groove 14b along the peripheral edge 14c of the upper surface 14a of the turntable 14. The rotary table 14 is formed so as to have the smallest area as much as possible. This is because part of the powder particles scraped from the annular groove 14b by the scraper 16 is less likely to remain on the outer peripheral upper surface portion 14 '.

  Further, the surface of the annular groove 14b of the rotary table 14 is finished to a surface roughness that suppresses slipping of the powder particles filled in the annular groove 14b. If demonstrating it, as shown in FIG. 3, the fixed quantity supply apparatus 10 is comprised so that the granular material with which it filled in the annular groove 14b with rotation of the turntable 14 may hit the scraper 16 (it acts). Therefore, due to the reaction of the scraper 16, the granular material filled in the annular groove 14b is integrally moved relative to the annular groove 14b in the direction opposite to the rotation direction R1 of the rotary table 14, that is, in the annular groove 14b. There is a possibility of sliding.

  As a countermeasure, the surface in the annular groove 14b is finished so that the granular material does not move relative to the annular groove 14b in the direction opposite to the rotation direction R1 of the turntable 14. For example, the surface of the annular groove 14b is finished by sand blasting, shot blasting, or the like. Thereby, the granular material filled in the annular groove 14b is stably conveyed toward the scraper 16 by the rotary table 14 without sliding in the annular groove 14b integrally.

  The rotary table 14 rotates to the cylindrical container 12 such that a part of the annular groove 14b is located inside the cylindrical container 12 and the remaining part of the annular groove 14b is located outside the cylindrical container 12. It is attached as possible. In the case of the present embodiment, as shown in FIG. 1 and FIG. 2, the turntable 14 is cylindrical so that a part of the bottom surface 12 a of the cylindrical container 12 constitutes a part of the top surface 14 a of the turntable 14. Attached to the container 12.

  By rotating the rotary table 14, the powder particles in the cylindrical container 12 are filled in the annular groove 14 b of the rotary table 14 and conveyed toward the scraper 16 outside the cylindrical container 12. .

  In order to reliably fill the granular material in the annular groove 14 b of the rotary table 14, the fixed amount supply device 10 includes an agitator 22 and a roller 24.

  The agitator 22 is provided on the bottom surface 12 a of the cylindrical container 12. The agitator 22 includes a plurality of blades 22a. The plurality of blades 22a are attached to the rotating shaft 22b. The rotating shaft 22b rotates around the center line C1 of the cylindrical container 12, and is rotated through a gear (not shown) by a motor (not shown) that rotationally drives the rotating shaft 20 of the rotating table 14, for example. The table 14 is rotationally driven at a predetermined reduction ratio. The plurality of blades 22a are disposed on the bottom surface 12a of the cylindrical container 12, and move on the bottom surface 12a of the cylindrical container 12 while rotating around the center line C1 by the rotation of the rotating shaft 22b.

  Such an agitator 22 can agitate the powder particles in the cylindrical container 12. Moreover, when the granular material which tends to become a lump when it gathers densely is accommodated in the container 12, the agitator 22 also plays the role which isolate | separates a lump-like granular material separately. If it demonstrates, the granular material near bottom face 12a of cylindrical container 12 will receive the dead weight of the granular material located in the upper part, and will be easy to become a lump. Therefore, the blades 22a of the agitator 22 separate the bulk particles near the bottom surface 12a of the cylindrical container 12 so that the powder particles are not filled in the annular groove 14b of the turntable 14 in a lump state. .

  The roller 24 is a cylindrical rotating body, and is supported by the cylindrical container 12 so that it can freely rotate and its outer peripheral surface 24 a faces the annular groove 14 b of the rotary table 14. Specifically, as shown in FIG. 1, the annular groove 14 b going from the inside to the outside of the cylindrical container 12 faces the annular groove 14 b of the turntable 14 at a portion of the side wall 12 b of the container 12 that passes below. And the roller 24 is accommodated in the recess 12c.

  The roller 24 is also arranged so that the rotating direction of the roller 24 and the moving direction of the annular groove 14b are the same in the facing region between the outer peripheral surface 24a and the annular groove 14b of the turntable 14. Further, the roller 24 is made of a material to which the powder particles are difficult to adhere, for example, a plastic material, or the outer peripheral surface 24a is finished with a surface roughness to which the powder particles are difficult to adhere. By this roller 24, the granular material is ground and filled in the annular groove 14b.

  The reason why such a roller 24 is used will be described with reference to FIG.

  FIG. 4A shows the flow of the granular material that flows along with the rotation of the turntable 14. FIG. 4A shows a case where the granular material is ground not by the roller 24 but by the inner surface of the side wall 12 b of the cylindrical container 12.

  As shown in FIG. 4A, the granular material flows with the rotation of the rotary table 14, and the granular material is the side wall 12b of the cylindrical container 12 through which the annular groove 14b of the rotary table 14 passes below. Gather in the part. That is, the granular material is concentrated in the vicinity of the outlet of the cylindrical container 12 communicating with the outside.

  At this time, in the case of a granular material that is difficult to slip, a continuous high-density region may be formed in the powder fluid near the outlet of the cylindrical container 12. When a continuous high density granular material region is formed, an unfilled portion E in which no granular material exists in the annular groove 14b may occur as shown in FIG. 4B. If such an unfilled portion E occurs accidentally and intermittently, the amount of the granular material conveyed toward the scraper 16 becomes unstable. As a result, the scraping amount of the powder particles of the scraper 16 is not stable, and the quantitative supply device 10 becomes difficult to quantitatively supply the powder particles.

  The phenomenon that the unfilled portion E of the granular material is formed in the annular groove 14b of the turntable 14 as shown in FIG. 4B is the same as the inner surface of the side wall 12b of the cylindrical container 12. This is likely to occur when the granular material is ground by a plane standing at an angle of about 90 degrees with respect to the upper surface 14a. Therefore, in this embodiment, the granular material is ground not by the inner surface of the side wall 12b of the cylindrical container 12 but by the outer peripheral surface 24a of the roller 24 which is a curved surface.

  The roller 24 has at least one of both ends in the width direction of the outer peripheral surface 24a at the upper surface 14a of the rotary table 14 (specifically, at least one of the outer peripheral side upper surface portion 14a ′ or the central side upper surface portion 14a ″). It is arrange | positioned so that it may contact. Thereby, the granular material is filled in the annular groove 14b up to the upper surface 14a of the turntable 14. Further, the rotational speed of the roller 24 is set to be the same as the rotational speed of the rotary table 14 (the peripheral speed in the annular groove 14b). As a result, it is possible to prevent the powder particles filled in the annular groove 14b from sliding together in the annular groove 14b.

  If it demonstrates, in the opposing area | region of the roller 24 and the annular groove 14b, it is the state by which the granular material filled in the annular groove 14b was pinched | interposed into the roller 24 and the annular groove 14b. Therefore, when the rotational speed of the roller 24 is slower than the moving speed of the annular groove 14b of the turntable 14, a high speed gradient may occur in the granular material in the annular groove 14b on the deep side of the annular groove 14b. When this velocity gradient becomes too large, there is a possibility that the shallow granular material slides in the direction opposite to the rotation direction R1 of the turntable 14 with respect to the deep granular material of the annular groove 14b. Alternatively, there is a possibility that the powder particles in the annular groove 14b may slide together with respect to the annular groove 14b.

  In order to maintain contact between the outer peripheral surface 24a of the roller 24 and the upper surface 14a of the turntable 14, the roller 24 is applied toward the turntable 14 by a biasing means such as a spring 26, as shown in FIG. Preferably.

  In addition, when there is no possibility that the powder particles are integrated and slip with respect to the annular groove 14b of the turntable 14 (for example, when the surface of the annular groove 14b is sufficiently blasted as described above), the roller 24 is The size that can be accommodated in the annular groove 14b, that is, the width of the outer peripheral surface 24a may be narrower than the width in the annular groove 14b. However, in this case, the roller 24 is not urged toward the bottom in the annular groove 14b by the urging means such as the spring 26 (if the urging means is used, the granular material in the annular groove 14b is pressed and hardened. Become).

  As shown in FIG. 2, the scraper 16 has a spherical shape and is rotated so that a part of the scraper 16 is positioned in a portion of the annular groove 14 b of the rotary table 14 positioned outside the cylindrical container 12. It is configured. Specifically, the spherical scraper 16 is arranged so that the center of the spherical scraper 16 is located outside the annular groove 14 b of the turntable 14 or at the same height as the upper surface 14 a of the turntable 14.

  The scraper 16 is arranged so that a minute gap is formed between the surface of the annular groove 14 b of the turntable 14. The reason is that if the scraper 16 is in contact with the annular groove 14b, the rotation table 14 and the scraper 16 may be prevented from rotating at a stable rotational speed, and at least one of the scraper 16 or the annular groove 14b is worn. Because there is a fear. If there is no such fear, for example, if the friction generated between the scraper 16 and the rotary table 14 is extremely small, the scraper 16 can rotate even if the surface of the annular groove 14b and the scraper 16 come into contact with each other. Good.

  Furthermore, the scraper 16 is attached to the tip of a rotating rod 16a that rotates about the rotation center line C3 in order to rotate. The rotating rod 16a is driven to rotate by, for example, a motor (not shown).

  The rotation direction R2 of the scraper 16 that rotates about the rotation center line C3 is such that the powder particles in the annular groove 14b of the turntable 14 are moved outside the turntable 14, that is, outside the turntable 14, as shown in FIG. It is set in a direction that can be scraped toward the chute 18 disposed in the position.

  Specifically, as shown in FIG. 1, when viewed in the direction of the rotation center line C <b> 2 of the rotary table 14, the scraping direction S of the powder particles of the scraper 16 is determined by the tangential direction component St and the radial direction component of the rotary table 14. When divided into Sr, it is preferable that the tangential direction component St in the scraping direction S is the same direction as the rotation direction R1 of the turntable 14 or zero. To explain, when the tangential direction component St is in the direction opposite to the rotation direction R1 of the turntable 14, along the upstream portion of the scraper 16 and beyond the upper surface 14a of the turntable 14 (that is, overflowing from the annular groove 14b). Accumulated powder particles. Moreover, the accumulation amount of the granular material exceeding the upper surface 14a of this turntable 14 changes with time. When the amount of deposition changes with time, the scraping amount of the powder particles to the chute 18 per unit time of the scraper 16 becomes unstable. On the other hand, when the tangential component St in the scraping direction is the same direction as the rotation direction R1 of the turntable 14 or zero, such a problem hardly occurs.

  For this purpose, the rotation center line C3 of the scraper 16 (rotating rod 16a) has a rotation table relative to the tangential direction of the rotation table 14 when viewed in the direction of the rotation center line C1 of the rotation table 14, as shown in FIG. 14 is inclined at an angle α. Thereby, a granular material is scraped out smoothly toward the chute | shoot 18 from the inside of the annular groove 14b. The angle α is preferably as close to zero as possible, and particularly preferably zero (in this case, the tangential component St in the scraping direction becomes zero and the powdered fluid is scraped in the radial direction of the rotary table 14). The closer the angle α is to zero, the shorter the moving distance of the powder that is scraped from the annular groove 14 b and moves toward the chute 18, and the powder can be easily scraped to the chute 18.

  Further, the rotation center line C3 of the scraper 16 is located on the downstream side of the rotation direction R1 of the turntable 14 when viewed from the radially outer side to the center side of the turntable 14 as shown in FIG. Is inclined by an angle β with respect to the upper surface 14a (annular groove 14b). As shown in FIG. 2, the scraper 16 rotates so that the surface of the scraper 16 moves outward from the center side of the rotary table 14 in a region facing the annular groove 14 b.

  It is preferable that the inclination angle β of the rotation center line C3 of the scraper 16 is small. When the inclination angle β is small, the granular material of the rotary table 14 can be surely scraped from the bottom of the annular groove 14b at the surface portion of the scraper 16 having a high peripheral speed (that is, the surface portion away from the rotation center line C3). The angle β is preferably closer to zero, and particularly preferably zero. As the angle β is closer to zero, the powder fluid in the annular groove 14b can be scraped out to the outside at the portion of the scraper 16 having a higher peripheral speed.

  In addition, the inclination angle β of the rotation center line C3 of the scraper 16 is an angle of 90 degrees or more, that is, the rotation center line C3 is upstream of the rotation direction R1 of the turntable 14 unless the granular material contacts the rotation rod 16a. It may be inclined. However, in this case, the rotation direction of the scraper 16 is opposite to the case where the rotation center line C3 is inclined downstream.

  Furthermore, in order to improve the scraping property of the powder particles of the scraper 16, a plurality of concave portions or a plurality of convex portions may be formed on the surface of the scraper 16. A groove or dimple may be formed as the recess. However, it is necessary to prevent clogging of the granular material in the concave portion or between the convex portions. For example, when a groove is formed on the surface of the scraper 16, it is preferable that the groove has an open end so that the granular material inside the groove reliably comes out of the groove when the scraper 16 rotates.

  According to such a scraper 16, the powder particles in the annular groove 14 b of the rotary table 14 are scraped out from the annular groove 14 b of the rotary table 14 toward the chute 18 by the rotation of the scraper 16. Therefore, the granular material cannot remain in the scraper 16. In other words, the powder particles are not gathered densely in the scraper 16, and the powder particles are suppressed from being agglomerated by the scraper 16. As a result, the scraping amount of the granular material per unit time of the scraper 16 is stabilized, and the quantitative supply device 10 can supply the granular material at a stable supply speed.

  As shown in FIG. 1 and FIG. 3, when the scraper 16 scrapes out the granular material, the granular material spilled on the outer peripheral side upper surface portion 14 a ′ and the central upper surface portion 14 a ″ of the rotary table 14 is again cylindrical. The fixed amount supply apparatus 10 is configured to return to the inside of the container 12.

  To explain, the scraper 16 does not scrape all the powder particles filled in the annular groove 14 b of the rotary table 14 toward the chute 18. A small part of the granular material conveyed toward the scraper 16 spills on the outer peripheral side upper surface portion 14a ′ and the central upper surface portion 14a ″ of the rotary table 14 when the scraper 16 scrapes the granular material, or It is left behind in the annular groove 14b.

  Note that the amount of powder particles spilling on the outer peripheral side upper surface portion 14a ′ and the central side upper surface portion 14a ″ of the rotary table 14 and the amount of powder particles remaining in the annular groove 14b are almost stable. The stability of the scraping amount of the granular material per unit time to the chute 18 of the scraper 16, that is, the stability of the quantitative supply of the granular material of the quantitative supply device 10 is ensured.

  The granular material left in the annular groove 14 b by the scraper 16 is returned to the cylindrical container 12 as it is by the rotation of the rotary table 14.

  On the other hand, the powder particles spilled on the outer peripheral side upper surface portion 14a ′ and the central upper surface portion 14a ″ of the rotary table 14 when the scraper 16 scrapes the powder particles are shown in FIG. 1 and FIG. Then, it passes through the tunnel portion 12 d of the cylindrical container 12 and is returned into the cylindrical container 12.

  The tunnel portion 12d is formed in a portion of the side wall 12b of the cylindrical container 12 through which the annular groove 14b of the rotary table 14 from the outside to the inside of the cylindrical container 12 passes below.

  The tunnel portion 12d also includes an outer opening 12e formed on the outer surface of the cylindrical container 12 and an inner opening 12f formed on the inner surface, as shown in FIGS. It extends along 14a and along the annular groove 14b. Further, as shown in FIG. 1, the tunnel portion 12 d has a predetermined granular material through which spilled particles can pass on the outer peripheral side upper surface portion 14 a ′ of the turntable 14 and in the vicinity of the annular groove 14 b of the central upper surface portion 14 a ″. It has a ceiling height (height from the upper surface 14a of the turntable 14) and a width.

  As shown in FIG. 1 and FIG. 2, the center-side upper surface portion 14a '' of the turntable 14 is covered so that a large amount of powder particles are not placed on the center-side upper surface portion 14a '' of the turntable 14. A guide member 26 for dropping the granular material is provided in the annular groove 14b.

  Further, as shown in FIG. 3, the tunnel portion 12d of the cylindrical container 12 has a cross-sectional area on the inner surface of the cylindrical container 12, that is, an opening area of the inner opening 12f is equal to a cross-sectional area on the outer surface, that is, the outer opening 12e. It is preferable that it is formed so as to be smaller than the opening area. Thereby, it is suppressed that the granular material accommodated in the cylindrical container 12 flows out outside via the tunnel part 12d. From another point of view, the granular material (especially the granular material deposited in a convex shape) that is scraped off by the scraper 16 and accumulated in the annular groove 14b is caught in the large outer opening 12e of the tunnel portion 12d. And return to the cylindrical container 12.

  In order to further suppress the outflow of the granular material through the tunnel portion 12d, the tunnel portion 12d is preferably longer. Therefore, you may extend the tunnel 12d part to the vicinity of the scraper 16e.

  The reason for using such a tunnel part 12d is demonstrated.

  When the tunnel portion 12d does not exist, the granular material spilled on the outer peripheral side upper surface portion 14a ′ and the central upper surface portion 14a ″ of the rotary table 14 when the scraper 16 scrapes the granular material is the cylindrical container 12. Cannot be returned to the inside of the cylindrical container 12. Therefore, the granular material is between the outer peripheral side upper surface portion 14 a ′ of the cylindrical rotary table 14 and the outer surface of the cylindrical container 12, and between the central upper surface portion 14 a ″ and the outer surface of the cylindrical container 12. accumulate.

  The granular material deposited between the outer peripheral side upper surface portion 14a ′ of the turntable 14 and the outer surface of the cylindrical container 12, and between the central upper surface portion 14a ″ and the outer surface of the cylindrical container 12, Each time the turntable 14 makes one rotation, the amount of deposition increases. When the amount of accumulation increases to some extent, a part of the granular material overflows in the annular groove 14b and the outside of the rotary table 14. When a part of the accumulated granular material overflows the annular groove 14b located on the upstream side of the scraper 16 with respect to the rotation direction R1 of the rotary table 14, the amount of the granular material conveyed to the scraper 16 becomes unstable. . In addition, when it overflows outside the rotary table 14, there is a possibility that it enters the chute 18. In any case, the stability of the powder supply of the quantitative supply device 10 is impaired.

  As a countermeasure, by providing the cylindrical portion 12d with the tunnel portion 12d, the space between the outer peripheral side upper surface portion 14a 'of the cylindrical rotary table 14 and the outer surface of the cylindrical container 12, the central upper surface portion 14a' 'and the cylinder The granular material is prevented from being deposited between the outer surface of the cylindrical container 12.

  According to the quantitative supply device 10 as described above, the granular material accommodated in the cylindrical container 12 is filled in the annular groove 14b of the rotating table 14 during rotation.

  The granular material filled in the annular groove 14 b inside the cylindrical container 12 is conveyed toward the scraper 16 located outside the cylindrical container 12 by the rotation of the rotary table 14.

  The granular material conveyed to the outside of the cylindrical container 12 is scraped out toward the chute 18 by the rotating scraper 16. The granular material scraped to the chute 18 is conveyed to a desired place.

  On the other hand, the granular material in the annular groove 14 b left by the scraper 16 is returned to the inside of the cylindrical container 12 by the rotation of the rotary table 14. On the other hand, when the scraper 16 scrapes off, the powder particles spilled on the outer peripheral upper surface portion 14a ′ and the central upper surface portion 14a ″ of the rotary table 14 pass through the tunnel portion 12d and enter the cylindrical container 12. Returned.

  According to the first embodiment, the granular material in the annular groove 14 b of the turntable 14 is scraped out from the annular groove 14 b by the rotation of the scraper 16. Therefore, the powder particles cannot stay in the scraper 16, that is, the powder particles do not gather densely in the scraper 16, and the powder particles are suppressed from being agglomerated by the scraper 16. As a result, the scraping amount of the granular material per unit time of the scraper 16 is stabilized, and the quantitative supply device 10 can supply the granular material at a stable supply speed.

(Embodiment 2)
In the second embodiment, the constituent elements other than the scraper that scrapes the granular material from the annular groove of the rotary table are the same as those in the first embodiment. Therefore, the description will focus on the scraper different from the first embodiment. In addition, the same code | symbol is attached | subjected to the component same as Embodiment 1. FIG.

  FIG. 5 is a diagram schematically showing a part of the configuration of the quantitative supply device 110 according to the second embodiment. 6 is a cross-sectional view taken along the line DD of FIG.

  As shown in FIGS. 5 and 6, unlike the spherical scraper 16 of the first embodiment, the scraper 116 of the second embodiment has a flat plate shape, specifically a disc shape. The rotation center line C3 of the scraper 116 is parallel to the flat plate surface (surface for scraping the powder particles). The rotation center line C <b> 3 extends in the horizontal direction parallel to the upper surface 14 a of the turntable 14 and in the tangential direction of the turntable 14.

  The scraper 116 is arranged so as to intermittently enter the annular groove 14b of the turntable 14 by rotation about the rotation center line C3. That is, as shown in FIG. 6, during the rotation of the scraper 116, there is a timing at which a part of the scraper 116 does not exist in the annular groove 14 b of the rotary table 14.

  According to such a disk-shaped scraper 116, the amount of powder particles scraped from the annular groove 14b by the scraper 116 (the scraping amount per unit time) is stabilized. In particular, in the case of a granular material that has low fluidity in a stationary state and tends to be agglomerated when densely gathered, the scraping amount per unit time is stabilized.

  This will be specifically described with reference to FIG. FIG. 7 shows a disc-shaped scraper 116 according to the embodiment and a rectangular scraper 116 'according to a comparative example. Similarly to the scraper 116 of the embodiment, the rectangular plate-shaped scraper 116 ′ of the comparative example is intermittently rotated by rotation about the rotation center line C <b> 3 extending in the horizontal direction and in the tangential direction of the rotation table 14. It arrange | positions so that it may enter in 14 annular groove 14b.

  The scraper 116 (116 ′) rotates at a higher speed than the rotation speed of the rotary table 14 in order to scrape many powder particles from the annular groove 14 b of the rotary table 14. Therefore, when viewed instantaneously, the scraper 116 (116 ′) scrapes off the powder particles in the annular groove 14 b of the rotary table 14. That is, a surface P corresponding to the shape of the scraper 116 (116 ') is instantaneously formed on the downstream side in the rotation direction R1 of the rotary table 14 of the granular material in the annular groove 14b.

  In the case of the disk-shaped scraper 116 according to the embodiment, the surface P of the granular material in the annular groove 14b formed by scraping the scraper 116 is an inclined surface. Specifically, as shown in FIG. 7, when viewed in the radial direction of the turntable 14, the turntable 14 is inclined from the upstream side to the downstream side in the rotation direction R <b> 1 as it goes from the upper part to the lower part of the annular groove 14 b. An inclined surface, specifically a curved surface, more specifically a partial spherical surface.

  In other words, the rotation trajectory drawn by the contour portion on the particle body side of the disc-shaped scraper 116 in the annular groove 14b of the turntable 14 is an inclined surface (curved surface (partial spherical surface)), and the inclined surface (curved) A surface P having a shape corresponding to a surface (partial spherical surface) rotation locus is formed by the scraper 116 on the granular material in the annular groove 14b.

  On the other hand, in the case of the rectangular plate-shaped scraper 116 ′ of the comparative example, the surface P ′ of the granular material scraped by the scraper 116 ′ is a vertical surface. Specifically, as shown in FIG. 7, when viewed in the radial direction of the turntable 14, it is a plane extending in the vertical direction from the upper part to the lower part of the annular groove 14b.

  FIG. 8 shows powder particles G1 to Gn (G1 ′ to Gn ′) that are sequentially scraped from the annular groove 14b each time the scraper 116 (116 ′) makes a half rotation when viewed in the radial direction of the rotary table 14. n represents an integer of 2 or more. For example, after the powder G1 (G1 ') is scraped, the next powder fluid G2 (G2') is scraped by the scraper 116 (116 '). Note that the rotational speed of the disc-shaped scraper 116 of the embodiment shown in FIG. 8 and the rectangular scraper 116 'of the comparative example are the same. Further, the rotation speed of the turntable 14 is the same in the example and the comparative example.

  For example, in the case of a granular material such as wheat flour, that is, a granular material that has a low fluidity in a stationary state and tends to be agglomerated when densely collected, the scraper 116 (116 ′) rotates at a high speed. Once the inclined surface (curved surface) P of the example and the vertical surface P ′ of the comparative example are once formed by '), the surface P (P ′) is then subjected to the granular material by the scraper 116 (116 ′). It can be thought that it will remain intact until scraped.

  For example, the surface P (P ′) formed by scraping the granular material G1 (G1 ′) by the scraper 116 (116 ′) is maintained until the next powder fluid G2 (G2 ′) is scraped. The Thus, each time the scraper 116 (116 ′) makes a half rotation, a predetermined amount of powder fluid G1 to Gn (G1 ′ to Gn ′) is sequentially scraped from the annular groove 14b, and a new surface P (P ′) is formed. It is formed each time.

  However, as in the comparative example, when the surface P ′ of the granular material in the annular groove 14b formed by the scraper 116 ′ is a vertical surface, before the granular material is scraped by the scraper 116 ′ next, The surface P ′ may collapse. As a result, a large amount of powdered fluid may collapse into the region in the annular groove 14b through which the scraper 116 'passes on the downstream side in the rotation direction R1 of the turntable 14.

  At this time, there is no problem when a part of the granular material scraped off by the scraper 116 'is collapsed next, but because of the property that the granular material tends to be agglomerated, the next scraper 116' Part of the powdered fluid that is scraped off may collapse. For example, the surface P ′ (vertical surface) formed by scraping the powder fluid G1 ′ by the scraper 116 ′ collapses, and then a part of the powder G2 ′ scraped by the scraper 116 ′ and the next A part of the granular material G3 ′ scraped off by the scraper 116 ′ may collapse to the downstream side in the rotation direction R of the rotary table 14. When this happens, naturally, the scraping amount per unit of the granular material scraped from the annular groove 14b by the scraper 116 'becomes unstable.

  As a countermeasure, as shown in FIG. 8, the scraper 116 according to the embodiment is formed in the annular groove 14 b so that an inclined surface that is less likely to collapse than the vertical surface is formed as the surface P of the granular material in the annular groove 14 b. The powder is scraped. Specifically, the scraper 116 has a disk shape and rotates around a rotation center line C3 extending in the horizontal direction and in the tangential direction of the turntable 14. Each time such a scraper 116 makes a half rotation, a predetermined amount of powder particles G1 to Gn are stably scraped out from the annular groove 14b. As a result, the scraped amount of the granular material per unit time is stabilized.

  Note that the rectangular plate-shaped scraper 116 'itself of the comparative example is not completely denied. FIG. 9 shows a comparative scraper 116 ′ arranged in a different posture. As shown in FIG. 9, if the rotation center line C3 is inclined and the corner 116b 'of the rectangular plate-shaped scraper 116' rotates intermittently to enter the annular groove 14b, the scraper 116 'is formed. The surface P of the granular material in the annular groove 14b is an inclined surface that does not easily collapse.

  Therefore, in a broad sense, the scraper of the present invention has a direction in which the annular groove 14b extends (the rotary table 14) when the surface of the granular material scraped by the scraper is seen in the radial direction of the rotary table 14. The shape is such that the inclined surface is inclined with respect to the rotation direction R1), and is arranged so that the inclined surface can be realized. That is, in the annular groove 14b of the turntable 14, the scraper is arranged so that the rotation locus drawn by the contour portion on the powder fluid side of the scraper is an inclined surface that is inclined when viewed in the radial direction of the turntable 14. Constructed and arranged.

  The flat plate-shaped scraper 116 of the second embodiment includes two flat blades that extend radially from the rotation center line C3 and scrape the powdered fluid from the annular groove 14b every half rotation. Can be considered. However, the present invention is not limited to a scraper having two scraped blades.

  For example, as shown in FIG. 10A as viewed in the direction of the rotation center line C3, the scraper 216 may be provided with three flat-shaped scraping blades 216a extending in the radial direction from the rotation center line C3 at an angular interval of 120 degrees. . Further, for example, as shown in FIG. 10B, a scraper 316 including three scraped blades 316a having a curved plate shape that is curved when viewed in the direction of the rotation center line C3 may be used. In this regard, the spherical scraper 16 of the first embodiment can be regarded as a scraper having an infinite number of scraping blades.

  Further, the disc-shaped scraper 116 of the second embodiment scoops the powder particles in the annular groove 14b and scrapes them out. Therefore, a part of the granular material scraped out from the annular groove 14 b by the scraper 116 may not be directed to the chute 18 and may be scattered to the center side of the rotary table 14. Therefore, as shown in FIG. 5 and FIG. 6, it is preferable to provide a cover member 130 that prevents scattering of powder particles scraped from the annular groove 14 b by the scraper 116 to the center side of the rotary table 14.

  As shown in FIG. 6, the cover member 130 extends along the rotating scraper 116 and has a cylindrical guide surface 130 a centering on the rotation center line C. Specifically, the guide surface 130 a extends from above the scraper 116 through the center side of the rotary table 14 to the rotary table 14. By the guide surface 130a of the cover member 130, the granular material scraped out from the annular groove 14b by the scraper 116 and scattered toward the upper side of the scraper 14 or the center side of the rotary table 14 is returned again into the annular groove 14b.

  Note that this cover member 130 may also be provided in the quantitative supply device 10 of the first embodiment.

  According to the second embodiment, similarly to the first embodiment, the scraping amount of the powder particles per unit time of the scraper 116 is stable, and the powder particles can be supplied at a stable supply speed.

  Although the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments.

  For example, in the case of the above-described embodiment, there is one scraper that scrapes out the granular material filled in the annular groove of the rotary table, but the present invention is not limited to this. There may be a plurality of scrapers that scrape the powder particles from the annular groove.

  Further, for example, as shown in FIG. 11, when the scraper 16 scrapes the granular material from the annular groove 14 b, the granular material spilled on the outer peripheral side upper surface portion 14 a ′ of the rotary table 14 is moved to the chute 18. 30 may be provided in the metering device. The scraper 30 is provided so that the granular material on the outer peripheral side upper surface portion 14 a ′ can be guided toward the chute 18.

  Instead of such a scraper 30, a scraper is provided for dropping particles spilled on the outer peripheral side upper surface portion 14 a ′ or the central side upper surface portion 14 a ″ of the rotary table 14 into the annular groove 14 b. Also good.

  Furthermore, the annular groove of the rotary table is not limited to the annular groove 14b having a semicircular cross section as in the above-described embodiment. In a broad sense, the cross-sectional shape of the annular groove may be any shape as long as the rotary table can rotate with a portion of the scraper positioned in the annular groove of the rotary table.

  For example, as shown in FIG. 12, an annular groove 114b having a V-shaped cross section and a conical scraper 416 may be used. In this case, in order for the scraper 416 to rotate, it is necessary to arrange the scraper 416 so that the rotation center line C3 of the scraper 416 is parallel to the rotation center line C2 of the turntable 114.

  In addition, a combination of an annular groove having a right-angled square cross section and a cylindrical scraper, an annular groove having a U-shaped cross section and a hemispherical or spherical scraper is also possible. Further, like the annular groove having a semicircular cross section and the spherical scraper, the cross sectional shape of the annular groove and the shape of the scraper need not be geometrically engaged. An annular groove provided and a prismatic scraper may be used. In consideration of the scraping performance of the scraper powder, the depth of the annular groove is preferably shallow (the distance from the top surface to the bottom of the rotary table is short).

  In addition, the quantitative supply device may be configured such that the rotation speed of the rotary table and the rotation speed of the scraper are controlled in correspondence.

  The scraping amount of the granular material per unit time scraped out from the annular groove by the scraper, that is, the feeding rate of the granular material of the quantitative feeding device (the feeding amount of the granular material per unit time) is the rotation speed of the rotary table. , Depending on the rotational speed of the scraper. Therefore, if the correspondence relationship between the powder supply speed, the rotation speed of the rotary table, and the rotation speed of the scraper is obtained in advance logically or experimentally, the supply speed of the powder and the rotation speed of the rotary table and the scraper The rotation speed can be adjusted by controlling the rotation speed. That is, the powder particles can be supplied at a more stable supply rate.

  For example, the fixed-quantity supply device includes an input device such as an operation panel for adjusting the supply speed of powder particles, and the rotation speed of the rotary table and the rotation of the scraper based on the supply speed of the powder particles input to the input device. And a control device for controlling the speed. When the supply speed of the granular material desired by the operator is input via the input device, the control device performs the rotation speed of the rotary table and the scraper of the scraper so as to realize the input supply speed of the granular material. Control the rotation speed. Thereby, an operator can supply a granular material with the stable supply speed desired.

  In addition, for example, the fixed amount supply device includes a measuring device that periodically measures the powder particles scraped from the annular groove to the outside of the rotating table, and the rotating table of the rotating table is stabilized so that the measurement result by the measuring device is stabilized. The rotation speed and the rotation speed of the scraper may be controlled by a control device. Thereby, a granular material can be supplied with the further stable supply rate.

  Further, for example, either the rotation speed of the rotary table or the rotation speed of the scraper is monitored by, for example, an encoder, and the supply speed of the granular material is made constant according to the fluctuation of the one rotation speed to be monitored. The other rotational speed may be controlled. Thereby, a granular material can be supplied with the further stable supply rate.

  The present invention is not limited to powders and the like that are likely to be agglomerated, such as wheat flour, but also can be quantitatively supplied to powders and the like having high fluidity such as salt. It can be applied to the fixed quantity supply apparatus.

10 Metering device 12 Container (cylindrical container)
14 rotating table 14a upper surface 14b annular groove 16 scraper

Claims (6)

A quantitative supply device for supplying powder particles at a stable supply speed,
A container for containing powder,
A rotary table provided on the upper surface with an annular groove filled with powder particles,
A scraper that scrapes the powder particles in the annular groove of the rotary table,
The rotary table is rotatably arranged so that a part of the annular groove is located inside the container and the remaining part of the annular groove is located outside the container,
The scraper rotates in the direction of scraping the powder filled in the annular groove inside the container toward the outside of the rotary table outside the container, and the powder in the annular groove formed by being scraped off by the scraper. A fixed-quantity supply apparatus provided with the shape which becomes the inclined surface which inclines when the surface of this is seen in the radial direction of a turntable.   The quantitative supply device according to claim 1, wherein the scraper has a flat plate shape and is arranged so as to enter the annular groove by rotating about a rotation center line parallel to the flat plate surface.   The quantitative supply device according to claim 1, wherein the scraper has a spherical shape and is disposed so that a part thereof is positioned in the annular groove.   The fixed-quantity supply apparatus of Claim 3 with which the surface of a scraper is provided with a some recessed part or convex part.   The fixed-quantity supply apparatus of Claim 4 whose recessed part of the surface of a scraper is a groove | channel provided with an open end.   The quantitative supply device according to any one of claims 1 to 5, further comprising a cover member that prevents the powder particles scraped from the annular groove by the scraper from scattering toward the center of the rotary table.

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