JPH07106791B2 - Rotary feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a rotor having a plurality of recesses provided in the casing in a circumferential direction so as to be rotatable about a horizontal axis,
First and second parts for forming a self-weight supply path for the powder and granules to the rotor and a self-weight discharge path for the powder and granules from the rotor, and partitioning the self-weight supply path and the self-weight discharge path through the rotor.
The present invention relates to a rotary feeder having a partition wall provided in the casing.

[Conventional technology]

Conventionally, in the above rotary feeder, as shown in FIG. 11, the first partition wall portion (4) on the side through which the concave portion (3) accommodating the powder and granules passes along with the rotation of the rotor (2) and the powder and granules. The second partition wall (5) on the side through which the empty recessed portion (3) having discharged the body passes is formed vertically above and below the level of the rotational axis (0) of the rotor (2), and the recessed portion is formed. (3) The first surface (8) directed in the rotational direction of the inner surface and the second surface (9) directed rearward in the rotational direction are each formed into a flat surface.

[Problems to be solved by the invention]

However, especially the rotor (2) in the first partition (4)
In the portion lower than the level of the rotary shaft core (0) of
The first partition wall portion (4) passes through while the powder or granular material contained therein is pressed by its own weight and the rotor (2) rotates and the powder or granular material on which the pressing force acts is slidably passed. Are easily worn, and when the concave portion (3) passes through the lower end of the first partition wall portion (4), the concave portion (3) opens downward, so that the powder or granular material in the concave portion (3) is removed at once. There is a risk of falling into the self-weight discharge path (Y), and in the second partition wall portion (5), the recess (3) opens upward as the recess (3) passes through the upper end thereof. Then, since the granular material rapidly invades into the concave portion (3), in the granular material having a wide particle size distribution, the density and weight of the granular material accommodated in each concave portion (3) vary. However, there is a problem in that uniform supply cannot be achieved.

An object of the first invention is to make it difficult for the first partition wall to be worn, and to make it possible to continuously drop and discharge the powdery particles into the dead weight discharge path in a quantitative manner.

[Means for solving problems]

The characteristic configuration of the rotary feeder of the first aspect of the present invention is that the first partition wall portion on the side through which the concave portion containing the powder and granules passes with the rotation of the rotor is formed at a level higher than the rotation axis of the rotor, In a cross-sectional view of the rotor, the lower side edge of the rotor in the rotor partition direction in the first partition wall, the angle between the horizontal line including the edge and the tangent of the point where this horizontal line intersects the rotor outer periphery, The first surface facing the rotation direction of the inner surface of the recess is provided at a position where the powder and granular material contained in the recess has a substantially repose angle, and the first surface facing the rotation direction of the recess is an arc surface. A second surface directed rearward in the rotational direction is formed on an arcuate surface having a radius of curvature equal to the radius of the rotor, and the one edge of the one recess in the rotational direction on the leading side in the rotational direction is the rotor rotational direction in the first partition wall. Same as the lower edge of In the level, the chord of the second surface in the another concave portion immediately before the end of the discharge of the granular material is inclined so as to form an angle of repose of the granular material accommodated in the concave portion with respect to the horizontal line. The concave portion is formed in the circumferential direction of the rotor, and the function and effect thereof are as follows.

[Action]

That is, when the concave portion passes through the first partition wall portion at a level higher than the rotation axis of the rotor, the pressing force due to the weight of the powder or granular material contained in the concave portion acts only on the inner surface of the concave portion, and Since the first partition wall is not easily abraded even when the rotor rotates because it does not act on the portion, the lower end of the concave portion (3) accommodating the granular material in the rotation direction is further suppressed as shown in FIG. Since the edge (D) passes through the lower edge (E) of the first partition wall (4) in the rotor rotation direction, the inclination of the opening of the recess (3) becomes approximately the angle of repose (θ). With the rotation of the rotor (2), the powder and granular material in the concave portion (3) does not suddenly drop in large amounts but gradually falls in small amounts gradually into its own weight discharge path (Y).

Moreover, as shown in FIGS. 3 to 5, the powder particles in the recess, which has the inner surface formed by the two circular arc surfaces, are continuously quantified in the dead weight discharge path (Y) as shown in FIGS. Is supplied as a drop.

That is, in the cross-sectional view of the rotor (2), as the rotor (2) rotates, the granular material inside the recess (3) falls while maintaining the angle of repose (θ), and the recess (3) When the inclination angle of the chord (16) of the second surface (9) at the angle of repose (θ) with respect to the horizontal line is surrounded by the arc (15) and the chord (16) forming the second surface (9). Granules remain in the curved concave part (17). Therefore, since the arc (15) is formed to have the same radius of curvature as the radius (R) of the rotor (2), the trailing edge (F) in the rotational direction of the first recess (3A) in FIG. ) And the area of the convex curved portion (20) surrounded by the chord (18) and the arc (19) passing through the leading edge (D), the concave curved portion (17)
Are equal in area, and the front edge (D) in the rotation direction of one recess (3) is at the same level as the lower edge (E) in the rotation direction of the rotor (2) in the first partition wall (4). , The chord (16) of the second surface (9) in the other recess (3) immediately before the end of the discharge of the powder is approximately the angle of repose of the powder or granules contained in the recess (3) with respect to the horizontal line ( Since the concave portion (3) is formed in the circumferential direction of the rotor (2) so as to be inclined with respect to θ, the first concave portion (3) shown in FIG. 3 is formed.
The granular material forming the convex curved portion (20) of (A) and the third concave portion (3
The powder and granules in the concave curved portion (17) of (C) fall simultaneously with the rotation of the rotor (2). Therefore, from the state of Fig. 3 to the state of Fig. 4, the rotor ( As 2) rotates, the amount of powder or granular material forming the convex curved portion (20) collapses gradually, but the amount of powder or granular material in the concave curved portion (17) gradually decreases. Therefore, the amount of the powdery particles that are simultaneously dropped and supplied from the first recessed portion (3A) and the third recessed portion (3C) to the self-weight discharge path (Y) becomes quantitative.

Next, after the particles of the convex curved portion (20) and the concave curved portion (17) have fallen, for example, the rotor (2) rotates by an angle of θ ₁ (FIGS. 4 to 5), First recess (3A) and second
Inside the recess (3B), the surface (f) of the granular material that keeps the angle of repose (θ) always shifts by θ ₁ while drawing an arc of radius (r) centered on the edge (D) (f From f to f '), the granular material always drops continuously from the recesses (3) to the self-weight discharge path (Y) by a constant amount.

〔The invention's effect〕

Therefore, the powder and granules are discharged from the self-weight supply passage to the self-weight discharge passage through the gap between the first partition wall portion and the rotor, which have become large due to the wear, and the total discharge amount of the powder and granules changes significantly. It has become possible to suppress the inconvenience that it will occur and to supply a stable amount over a long period of time. In addition, the powder and granules can be continuously dropped and supplied quantitatively without dropping a large amount into the discharge path of their own weight at once, making it easier and more stable to control the supply of powder and granules by the rotary feeder. It was

Furthermore, the powder and granules in the recess gradually slide down on the powder and granule while keeping the angle of repose little, and the frictional force with the inner surface of the recess does not act easily, so it is possible to suppress wear of the rotor itself, and in the end, the rotary feeder. The overall durability performance could be improved. Another object of the second invention is to make the first partition wall less likely to be worn and to allow the powder particles to be continuously dropped and discharged into the self-weight discharge path quantitatively regardless of the size of the particle size distribution.

[Means for solving problems]

The rotary feeder according to the second aspect of the present invention is characterized in that the first partition wall on the side through which the recess containing the powder or granules passes along with the rotation of the rotor is formed at a level higher than the rotation axis of the rotor. , The second partition wall portion on the side through which the empty concave portion that has discharged the powder and granules with the rotation of the rotor passes,
The rotor is formed at a level lower than the axis of rotation of the rotor, and in the cross-sectional view of the rotor, a lower side edge of the first partition wall in the rotor rotation direction is a horizontal line including the edge and the horizontal line is The angle between the tangent line of the point intersecting with the rotor outer periphery is provided at a position that is substantially the angle of repose of the powder or granular material accommodated in the recess, and the lower edge of the rotor in the rotor rotation direction of the second partition wall, The first surface of the inner surface of the recess facing the rotation direction, the angle between the horizontal line including the end edge and the tangent of the point where the horizontal line intersects the outer circumference of the rotor is substantially the angle of repose of the granular material, Is formed on an arcuate surface centered on the leading edge in the rotational direction of the recess and a second surface facing rearward in the rotational direction is formed on an arcuate surface having a radius of curvature equal to the radius of the rotor. Direction of rotation of the recess When the edge is at the same level as the lower edge in the rotor rotation direction of the first partition wall, the chord of the second surface in the other concave portion immediately before the end of the discharge of the granular material is horizontal to the horizontal line. The concave portion is formed so that the powder or granular material housed in the concave portion is inclined so as to form a substantially angle of repose.
It is formed in the circumferential direction of the rotor, and its operation and effect are as follows.

[Action]

That is, when the concave portion passes through the first partition wall portion at a level higher than the rotation axis of the rotor, the pressing force due to the weight of the powder or granular material contained in the concave portion acts only on the inner surface of the concave portion, and Since the first partition wall is not easily abraded even when the rotor rotates because it does not act on the portion, the lower end of the concave portion (3) accommodating the granular material in the rotation direction is further suppressed as shown in FIG. When the edge (D) passes through the lower edge (E) of the first partition wall (4) in the rotor rotation direction, the recess (3) is formed.
Since the inclination of the opening of the rotor becomes almost at the angle of repose (θ), a large amount of the granular material in the concave portion (3) does not suddenly drop with the rotation of the rotor (2) but gradually decreases gradually by its own weight discharge path. It falls to (Y).

Moreover, as shown in FIGS. 3 to 5, the powder particles in the recess, which has the inner surface formed by the two circular arc surfaces, are continuously quantified in the dead weight discharge path (Y) as shown in FIGS. Is supplied as a drop.

That is, in the cross-sectional view of the rotor (2), as the rotor (2) rotates, the granular material inside the recess (3) falls while maintaining the angle of repose (θ), and the recess (3) The second surface (9) is formed when the inclination angle of the chord (16) of the second surface (9) at the angle of repose (θ) with respect to the horizontal line.

The granular material remains in the concave curved part (17) surrounded by the arc (15) and the string (16). Therefore, since the arc (15) is formed to have the same radius of curvature as the radius (R) of the rotor (2), the trailing edge (F) in the rotational direction of the first recess (3A) in FIG. )
With respect to the area of the convex curved portion (20) surrounded by the chord (18) and the circular arc (19) passing through the front side edge (D), the concave curved portion (1
The area of 7) becomes equal, and the edge (D) of the one recessed portion (3) on the leading side in the rotation direction is the same as the edge (E) on the lower side of the rotor (2) in the rotation direction of the first partition wall (4). At the same level, another concave portion (3) immediately before the end of discharge of the granular material.
The concave portion (3) is formed so that the chords (16) of the second surface (9) in the above incline at an angle of repose (θ) of the granular material contained in the concave portion (3) with respect to the horizontal line. Since it is formed in the circumferential direction of the rotor (2), the powder and granular material forming the convex curved portion (20) of the first concave portion (3A) shown in FIG. 3 and the concave curved portion of the third concave portion (3C) are formed. The powder in the part (17) is the rotor (2)
It will fall simultaneously with the rotation of the
As the rotor (2) rotates from the state shown in FIG. 4 to the state shown in FIG. 4, the amount of the powder or granular material forming the convex curved portion (20) is gradually increased, but the concave curved portion is increased. The amount of powder and granules in (17) gradually decreases, so the amount of powder and granules that are simultaneously dropped and supplied from the first recess (3A) and the third recess (3C) to the self-weight discharge path (Y) is quantified. become.

Next, after the particles of the convex curved portion (20) and the concave curved portion (17) have fallen, for example, the rotor (2) rotates by an angle of θ ₁ (FIGS. 4 to 5), First recess (3A) and second
Inside the recess (3B), the surface (f) of the granular material that keeps the angle of repose (θ) always shifts by θ ₁ while drawing an arc of radius (r) centered on the edge (D) (f From f to f '), the granular material always drops continuously from the recesses (3) to the self-weight discharge path (Y) by a constant amount.

Furthermore, the lower edge of the second partition wall in the rotor rotation direction is at a level lower than the rotation axis of the rotor, and
Since the angle between the horizontal line including the edge and the tangent line at the point where this horizontal line intersects the outer circumference of the rotor is provided at a position approximately at the angle of repose of the powder or granules, it is possible to measure As the recess passes through the end edge, as shown in FIG. 3, the granular material becomes recessed (3) at the portion (H) lower than the rotation axis of the rotor in the dead weight supply path (X). Angle of repose (θ) between the leading edge (D) in the direction of rotation and the first surface (8)
Even if the particle size distribution of the granular material is large while the powder is gradually supplied to the concave portion (3) while maintaining the above, the concave portion (3) is not selectively filled with particles in a specific particle size range. In every (3), the granular material is filled with almost equal density and weight.

〔The invention's effect〕

Therefore, the powder and granules are discharged from the self-weight supply passage to the self-weight discharge passage through the gap between the first partition wall portion and the rotor, which have become large due to the wear, and the total discharge amount of the powder and granules changes significantly. It has become possible to suppress the inconvenience that it will occur and to supply a stable amount over a long period of time. In addition, the powder and granules do not drop into the discharge path of their own weight at a time, and it is possible to continuously drop and feed the powder and granules regardless of the size distribution of the powder and granules. It became easier and more stable to control body supply.

Furthermore, the granular material maintains the angle of repose little by little with respect to the concave portion, and enters while sliding on the granular material, and the granular material inside the concave portion gradually releases its own weight while maintaining the angle of repose little by little. Since the powder slides down the road, frictional force with the inner surface of the recess is less likely to act, wear of the rotor itself can be suppressed, and the durability of the entire rotary feeder can be further improved.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 5, a rotor (2) having a plurality of recesses (3) circumferentially provided in a casing (1).
Is provided so as to be rotatable around the horizontal axis (0), and the weight (G) feed path (X) of the powder to the rotor (2) and the weight release path (Y) of the powder from the rotor (2). And partitioning the self-weight supply path (X) and the self-weight discharge path (Y) via the rotor (2), the first and second partition parts (4), (5),
It is provided in the casing (1), and while the rotor (2) is rotated, the powder particles from the dead weight supply path (X) are accommodated in the recess (3) while being dropped into the dead weight discharge path (Y) in a fixed amount. It is composed of a rotary feeder.

With the rotation of the rotor (2), the first partition wall portion (4) on the side where the concave portion (3) accommodating the granular material passes is formed at a level higher than the rotation axis (0) of the rotor (2). Then, in a cross-sectional view of the rotor (2), the lower edge (E) of the first partition wall (4) in the rotation direction of the rotor (2) is a horizontal line including the edge (E) and this horizontal line is a rotor ( 2) The angle between the outer circumference and the tangent to the intersection is the angle of repose (θ) of the powder or granular material contained in the recess (3), or the angle of repose (θ), and the end on the upper hand side. The edge (A) is arranged almost vertically above the axis (0), and the edge (A) is
By integrally arranging the protrusions (6) projecting upward, powder particles are retained in the reservoir (7) formed by the protrusions (6) and the upper part of the casing (1), and the weight feeding path (X ) Does not slip in the casing (1), and the upper surface of the powder in the reservoir (7) always slides down to reduce wear on the inner surface of the casing (1).

The second partition wall portion (5) on the side through which the empty concave portion (3), which has completed the discharge of powder and granules as the rotor (2) rotates, has a lower level than the rotation axis (0) of the rotor (2). And the lower edge (C) of the second partition wall (5) in the rotation direction of the rotor (2) intersects with the horizontal line including the edge (C) and the outer periphery of the rotor (2). The angle between the point and the tangent is the angle of repose (θ) or the angle of repose (θ), and the powder and granules from the dead weight supply path (X) are connected to the second partition wall (5). ) And the rotor (2) are less likely to enter, and the density of the powder particles accommodated in each recess (3) is kept constant.

The upper edge (B) of the second partition wall portion (5) in the rotational direction of the rotor (2) is located slightly on the upstream side in the rotational direction of the shaft (0).

The inner walls of the first and second partition walls (4) and (5) are formed to be at least wider than the width of the recess (3) in the rotation direction.

The concave portion (3) with respect to the rotor (2) has a radius of curvature (r) with the first surface (8) of the inner surface facing the rotational direction as the center of the rotational direction leading edge (D) of the concave portion (3). ) The second surface (9) which is an arc surface and is directed rearward in the rotation direction.
Are formed on arcuate surfaces having a radius of curvature equal to the radius (R) of the rotor (2).

In a cross-sectional view of the rotor (2), a second surface (connecting the leading edge (D) of the recess (3) and the intersection (G) of the first surface (8) and the second surface (9) ( Form the extension of the string (16) of 9) so as to pass through the rotation axis (0) of the rotor (2),
The edge (D) on the leading side in the rotation direction of one recess (3A) is the first
When it is at the same level as the lower edge (E) in the direction of rotation of the rotor (2) in the partition wall (4), the chords of the second surface (9) in the other recess (3C) ( 16)
, Each concave portion (3) is formed so that the granular material contained in the concave portion (3C) inclines at an angle of repose (θ) of the granular material, and in the circumferential direction with respect to the concave portion (3A). The recesses (3C) are arranged at 90 ° (δ) positions, and eight recesses (3A) are provided in the circumferential direction of the rotor (2) at every 45 ° pitch.

Further, as shown in FIG. 2, in a cross section taken along the axis (0) of the rotor (2), side wall portions (10) are respectively provided at both ends of the recess (3) in the axial direction, and the rotor (2 ) Are integrally connected to each other and are configured so as not to allow the powder or granular material contained in the concave portion (3) to flow into the bearing portion (11) of the rotor (2), and further to the side wall portion (10). Mechanical seal part (1) that seals with the casing (1) around the rotating shaft (12)
3) is provided.

In the figure, (14) is a gland packing in the bearing section (11).

(21) is a bush.

[Another embodiment]

In the recess (3), the extension line of the string (16) is the rotor (2).
When it is formed so as to pass through the shaft core (0), the concave portion (3C) immediately before the end of the discharge of the granular material is at a position of 90 degrees with respect to the concave portion (3A) immediately before the start of the discharge of the granular material. If, for example, as shown in FIG. 6, four recesses (3) are arranged at intervals of 90 degrees in the circumferential direction of the rotor (2), adjacent recesses (3) It becomes the same as the relationship between 3A) and the recess (3C).

The extension of the string (16) is the axis (0) of the rotor (2).
When the second surface (9) is formed so as not to pass through, the shape of the concave portions (3) differs depending on the number of the concave portions (3) arranged at equal pitches in the circumferential direction of the rotor (2). FIG. 7 shows the case where three recesses (3) are provided,
Fig. 8 shows the case of arranging 5 recesses (3), Fig. 9 shows the case of arranging 6 recesses (3), and Fig. 10 shows the case of arranging 7 recesses (3). As shown in the figure, it may be formed, and in the end, the one edge (D) in the rotational direction of one concave portion (3) is formed on the rotor (2) in the first partition wall portion (4).
When it is at the same level as the lower edge (E) in the direction of rotation,
The chords (16) of the second surface (9) in the other recess (3) immediately before the end of the discharge of the powder and the horizontal line make the angle of repose (θ) of the powder and the particles accommodated in the recess (3) approximately the horizontal line. However, it suffices if each recess (3) is formed so as to be inclined.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a rotary feeder according to the present invention. FIG. 1 is a sectional view as seen from the axial center direction of the rotary feeder, and FIG. 2 is a sectional view of main parts along the axial center, FIG. 3, FIG. FIG. 5 and FIG. 5 are operation explanatory views of the cross section of the main part, FIG.
FIG. 7, FIG. 8, FIG. 9, and FIG. 10 are cross-sectional views showing another embodiment of the rotor, and FIG. 11 is a conventional example. (1) …… Casing, (2) …… Rotor, (3)…
... Recessed part, (4) ... 1st partition part, (5) ... 2nd partition part, (8) ... 1st surface, (9) ... 2nd surface, (D),
(E), (C) ... Edge, (0) ... Shaft core, (θ) ...
Angle of repose, (R) ... radius, (X) ... deadweight supply path,
(Y) …… The deadweight discharge path.

Claims (2)

[Claims] 1. A rotor (2) provided with a plurality of recesses (3) in the circumferential direction in a casing (1) so as to be rotatable around a horizontal axis (0) and to the rotor (2). And a self-weight supply path (X) for forming the self-weight discharge path (Y) of the powder and granules from the rotor (2), and the self-weight supply path (X) via the rotor (2). The first and second partition walls (4) and (5) for partitioning the self-weight discharge path (Y) are
A rotary feeder provided in the casing (1), wherein the first partition wall portion (4) on the side through which the concave portion (3) accommodating the granular material passes with the rotation of the rotor (2), The rotor (2) is formed at a level higher than the rotation axis (0) of the rotor (2), and the lower end of the first partition wall (4) in the rotation direction of the rotor (2) in the cross-sectional view of the rotor (2). The angle between the horizontal line including the edge (E) and the tangent at the point where the horizontal line intersects with the outer circumference of the rotor (2) is substantially equal to that of the powder or granular material accommodated in the recess (3). The first surface (8) of the inner surface of the concave portion (3), which faces the rotational direction, is provided at the position where the angle of repose (θ) is formed, and the rotational direction leading edge (D) of the concave portion (3) is the center. The radius of the rotor (2) is defined by the second surface (9) facing the circular arc surface and rearward in the rotational direction. R), each of which is formed on an arc surface having a radius of curvature equal to that of the first partition wall (4) in the rotational direction of the rotor (2). When it is at the same level as the lower edge (E), the chord (16) of the second surface (9) of the other recess (3) immediately before the end of the discharge of the granular material is the recess (with respect to the horizontal line). A rotary feeder in which the concave portion (3) is formed in the circumferential direction of the rotor (2) so as to incline at an angle of repose (θ) of the granular material contained in 3). 2. A rotor (2) provided with a plurality of recesses (3) in the circumferential direction in a casing (1) so as to be rotatable around a horizontal axis (0) and to the rotor (2). And a self-weight supply path (X) for forming the self-weight discharge path (Y) of the powder and granules from the rotor (2), and the self-weight supply path (X) via the rotor (2). The first and second partition walls (4) and (5) for partitioning the self-weight discharge path (Y) are
A rotary feeder provided in the casing (1), wherein the rotor is provided with a first partition wall portion (4) on a side through which a concave portion (3) accommodating the granular material passes along with the rotation of the rotor (2). The second partition wall portion formed on a level higher than that of the rotating shaft core (0) of (2) and on the side through which the empty recessed portion (3) that has discharged the powder and granules with the rotation of the rotor (2) passes. (5)
Is formed at a level lower than the rotation axis (0) of the rotor (2), and in a cross-sectional view of the rotor (2), the rotor (2) rotation direction in the first partition part (4) is shown. The powdery grain which accommodates the lower edge (E) in the recess (3) at an angle between a horizontal line including the edge (E) and a tangent at a point where the horizontal line intersects with the outer circumference of the rotor (2). It is provided at a position where the angle of repose (θ) of the body is almost the same, and the lower edge (C) of the second partition wall (5) in the rotation direction of the rotor (2) is a horizontal line including the edge (C). The angle between this horizontal line and the tangent of the intersection of the outer circumference of the rotor (2) is substantially the angle of repose (θ) of the granular material, and the inner surface of the recess (3) is oriented in the rotational direction. The first surface (8) is connected to the leading edge (D) in the rotation direction of the recess (3).
And a second surface (9) directed rearward in the rotational direction is formed on an arc surface having a radius of curvature equal to the radius (R) of the rotor (2) to form one recess ( When the leading edge (D) in the rotating direction of 3) is at the same level as the lower edge (E) in the rotating direction of the rotor (2) in the first partition wall portion (4), the end of discharge of the particulate material is completed. The chord (16) of the second surface (9) in the other concave portion (3) immediately before is inclined with respect to the horizontal line at an angle of repose (θ) of the granular material accommodated in the concave portion (3). Thus, the rotary feeder in which the concave portion (3) is formed in the circumferential direction of the rotor (2).