JP5774528B2 - Powder and particle feeder - Google Patents

Description

  The present invention relates to a granular material supply apparatus including a granular material leveling apparatus, and relates to a granular material supply apparatus capable of performing batch-type weighing with high accuracy.

  2. Description of the Related Art Conventionally, a powder and granular quantitative supply device has an inner cylinder for supplying powder and granular material on a bottom plate via a gap, and a lower end of an outer cylinder sharing a center line with the inner cylinder is connected to the bottom plate. An annular passage for powder particles discharged from the gap is formed in the middle, a discharge port is provided in the passage, and a central rotating blade (spoke) is provided in an upright rotating body protruding from the center of the bottom plate. An outer peripheral rotation ring is provided at the tip along the inner peripheral surface of the outer cylinder, and a plurality of inward claws are provided on the rotation ring, and a fixed amount is discharged from the discharge port (for example, Patent Document 1).

  In this type of granular material supply device, in order to prevent pulsation of the granular material when the granular material is discharged, an upper surface leveling plate of the granular material is disposed in the annular passage leading to the discharge port. A technique has been proposed in which the pulsation of the granular material is suppressed by leveling the upper surface of the granular material reaching the discharge port, thereby improving the measurement accuracy of the granular material (Patent Document 2).

Japanese Utility Model Publication No. 6-47860 Japanese Utility Model Publication No. 6-54640 (FIG. 16)

  By the way, the conventional leveling device (see FIG. 10) has a long distance R from the installation position 40 'of the upper surface leveling plate 40 of the granular material to the discharge port 41 where the granular material falls. Therefore, when the central rotary blade 42 or the inward claw 43 moves the distance R between the leveling plate 40 and the discharge port 41, the granular material is placed on the upper part of the central rotary blade 42 or the inward claw 43. Pulsation f may occur.

  In order to obtain a target granular material by batch measurement, the rotational driving of the central rotary blade 42 is stopped when the measured granular value approaches the target value. At this time, if there is pulsation f in the granular material in the range of the distance R, the state of the granular material on the side edge 41 ′ on the upstream side of the discharge port 41 at the stop timing of the central rotary blade 42 (the peak or valley of the pulsation). May affect the measurement value.

  Therefore, there is a demand for a granular material supply apparatus capable of batch-type weighing with higher accuracy. Further, in the conventional apparatus, it is necessary to provide a scraping plate 44 for the granular material remaining on the central rotary blade 42 on the downstream side of the discharge port 41.

  The present invention has been made in view of the above-described conventional problems, and in the powder supply apparatus using the upper surface leveling plate of the granular material, the discharge port of the granular material from the upper surface leveling plate of the granular material It is an object of the present invention to provide a granular material supply device that can eliminate the influence on the measurement value due to the pulsation of the granular material by shortening the distance to and can perform highly accurate batch type measurement.

  Moreover, it aims at providing the granular material supply apparatus which does not need to provide a scraping board in the downstream of a discharge port.

In order to achieve the above object, the present invention
First, an angle of repose (θ) is formed in the annular passage (5) in the outer cylinder (3) from the lower end (2 ″) in the inner cylinder (2) of the granular material in the inner cylinder (2). Discharge gaps (t) to be dispensed are provided, and a discharge port for the granular material that is transferred through the annular passage (5) by a plurality of spoke-shaped central rotary blades (8) that rotate along the bottom plate (4) ( 6) is provided, and the upper surface leveling plate (15) of the granular material is disposed in the annular passage (5) on the upstream side of the discharge port (6), and is transferred in the annular passage (5). In the granular material supply apparatus configured to level the upper surface of the granular material to be supplied by the upper surface leveling plate (15), the upper surface leveling plate (15) has a rising position (a) and a lowering position ( a ') so that it can be moved up and down, and the installation position of the upper surface leveling plate (15) is in the immediate vicinity of the side edge (6') on the upstream side of the discharge port (6). In the lowered position (a ′) of the upper surface leveling plate (15), the distance from the bottom plate (4) to the lower end (15b ′) of the upper surface leveling plate (15) is h, and the upper surface leveling plate is When the distance from the lower end (15b ′) of (15) to the upstream side edge (6 ′) of the discharge port (6) is L, the distance L is the spoke-like shape in the annular passage (5). It is smaller than the width T of the central rotary vane (8) and is always “L> h”, and the distance L is the width of the upstream side edge (6 ′) of the discharge port (6). It is comprised by the granular material supply apparatus characterized by being constant over a direction.

  The width T of the spoke-shaped central rotary blade (8) means, for example, the maximum width T of the rotary blade (8) in the annular passage (5). If comprised in this way, since the said distance L is smaller than the width | variety T of the spoke-shaped center rotary blade in a cyclic | annular channel | path, the upper surface leveling board was located in the descent | fall position in the latter half of batch type measurement. At this time, the upper surface of the granular material is blocked by the upper surface leveling plate, and after the upper surface is leveled and pulsation is removed, it is immediately dropped and supplied downward from the discharge port. Further, since the distance h between the lower end and the bottom plate of the upper surface leveling plate is shorter than the distance L (L> h), the pulsation of the granular material in the annular passage is reliably eliminated, and the upper surface leveling material is reduced. After the plate is lowered, a small amount of powder and granules are immediately supplied by dropping without causing pulsation from the discharge port. Accordingly, by lowering the upper surface leveling plate in the latter half of the batch measurement, highly accurate batch measurement can be performed.

  2ndly, it has a relationship of "L> h> k", when the thickness of the said spoke-shaped center rotary blade (8) is k, The granular material supply apparatus of said 1st characterized by the above-mentioned. Consists of.

  With this configuration, when the upper surface leveling plate is lowered, the upper surface of the spoke-shaped central rotary blade passes through a position close to the lower end of the upper surface leveling plate. Thus, the powder particles located on the upper surface of the spoke-shaped central rotary blade can be scraped off by the upper surface leveling plate. Therefore, it is not necessary to separately provide a scraping plate as in the prior art.

  Third, when the spoke-shaped central rotary blade (8) passes below the upper surface leveling plate (15) at the lowered position (a ′) of the upper surface leveling plate (15), the upper surface leveling plate (15) is moved upward. The lower end (15b ′) of the insulating plate (15) is close to the upper surface of the spoke-shaped central rotary blade (8). Composed.

  Here, the proximity means that the distance between the lower end of the upper surface leveling plate and the upper surface of the spoke-shaped central rotary blade is, for example, about 4 mm to 6 mm (= h ″). When the upper surface leveling plate descends, when the spoke-shaped central rotating blade passes through the lower end of the upper surface leveling plate, the upper surface leveling plate scrapes the powder particles located on the upper surface of the spoke-shaped central rotating blade. There is no need to provide a separate scraping plate.

  Fourth, a guide plate (17, 17 ′) along the plate surface of the upper surface leveling plate (15) is fixed in the annular passage (5), and the upper surface leveling plate (15) is fixed to the guide plate (15). 17, 17 ′), and is configured to move up and down.

  If comprised in this way, since the said upper surface leveling plate can be raised-lowered along the said guide plate, it can perform stable raising / lowering operation | movement.

  Fifth, the guide plate (17, 17 ′) is provided with a stopper member (18), and the upper surface leveling plate (15) is provided with an engaging member (16) that engages with the stopper member (18). When the upper surface leveling plate (15) is lowered to the lowered position, the engaging member (16) abuts on the stopper member (18) to restrict further lowering of the upper surface leveling plate (15). It is comprised by the granular material supply apparatus of the said 4th characterized by the above-mentioned.

  The stopper member can be constituted by a stopper pin (18), and the engaging member can be constituted by a position regulating piece (16). With this configuration, when the upper surface leveling plate is located at the lowered position, the lowered position can be regulated by the stopper member, so that the upper surface leveling plate can be stopped at an accurate position, and the upper surface leveling plate can be stopped. Accurate position control of the board can be performed.

  According to the present invention, when the upper surface leveling plate is positioned at the lowered position, the powder particles are leveled by the upper surface leveling plate and the pulsation is removed. Since a small amount of powder particles are dropped and supplied from the discharge port without causing pulsation, accurate batch-type weighing can be performed.

  Further, when the upper surface leveling plate is lowered, the upper surface of the spoke-shaped central rotary blade passes through a position close to the lower end of the upper surface leveling plate. The granular material located on the upper surface of the blade can be scraped off by the upper surface leveling plate, and there is no need to separately provide a scraping plate on the downstream side of the discharge port as in the conventional apparatus.

  Moreover, since the upper surface leveling plate can be moved up and down along the guide plate, a stable lifting operation can be performed.

  Moreover, when the upper surface leveling plate is positioned at the lowered position, the lowering position can be regulated by the stopper member, so that the upper surface leveling plate can be stopped at an accurate position, and the upper surface leveling plate can be accurately It can be driven up and down.

It is side surface sectional drawing of the granular material supply apparatus which concerns on this invention. It is a top view of a supply apparatus same as the above. It is expanded side surface sectional drawing of the upper surface leveling board vicinity of a supply apparatus same as the above. It is an enlarged plan view of the upper surface leveling plate vicinity of a supply apparatus same as the above. It is expanded front sectional drawing of the upper surface leveling board vicinity of a supply apparatus same as the above. It is expanded front sectional drawing of the upper surface leveling board vicinity of a supply apparatus same as the above. It is an enlarged plan view of the upper surface leveling plate vicinity in other embodiment of a supply apparatus same as the above. (A) is a top view which shows the relationship between the discharge port of a supply apparatus same as the above, and an upper surface leveling board, (b) is a top view which shows the relationship between the discharge port and an upper surface leveling board in other embodiment of the same supply apparatus. It is. It is a figure which shows the dimension of each part of the upper surface leveling board vicinity of a supply apparatus same as the above. It is expanded side surface sectional drawing of the discharge port vicinity of the conventional granular material supply apparatus.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a granular material supply device according to the present invention will be described in detail with reference to the accompanying drawings.

  The upper end flange 2 ′ of the inner cylinder 2 is attached with a bolt B to the flange 1 ′ at the lower end opening of the powder hopper 1. The outer cylinder 3 sharing the center line C with the inner cylinder 2 is integrally fixed to the outer surface of the inner cylinder 2 via an annular disc 3 '.

  In FIG. 2, the direction of rotation of the spoke-shaped central rotary blade 8 is the direction of arrow A, and the direction opposite to the direction of arrow A is a specific reference position in the annular passage 5 between the inner cylinder 2 and the outer cylinder 3. “Upstream side”, the arrow A direction side with respect to the specific reference position is referred to as “downstream side”.

  An outer edge 4 ′ of the bottom plate 4 is connected to the lower end flange 3 ″ of the outer cylinder 3 with a bolt B, an annular passage 5 is provided between the inner and outer cylinders 2, 3, and the bottom plate 4 constituting the lower surface of the passage 5 is powdered. 4 and 8 (a), the outlet 6 is provided on the upstream side along the radial direction of the circle centering on the center line C in the passage 5. As shown in FIG. The edge 6 ', the side edge 6 "on the downstream side along the radial direction of the circle having the center line C as the center, and a circle having a radius slightly longer than the radius of the inner cylinder 2 with the center line C as the center An inner arc-shaped side edge 6a along the circumference and an outer arc-shaped side edge 6a ′ along the circumference of a circle having the same radius as the outer cylinder 3 with the center line C as the center. The outlet 6 as a whole has a substantially fan shape.

  Then, the lower end 2 ″ (see FIG. 1) of the inner cylinder 2 is brought closer to the bottom plate 4, and the powder particle discharge gap (discharge gap) is between the lower end 2 ″ of the inner cylinder 2 and the upper surface of the bottom plate 4. t is provided.

  Further, the upper end portion 7 of the upright rotating shaft 7 ′ sharing the center line C protrudes on the bottom plate 4, and the four spoke-shaped central rotary blades 8 extend along the bottom plate 4 at 90 degrees to the upper end portion 7. Provided with an angular difference (see FIG. 2).

  The tip of the spoke-shaped central rotary blade 8 passes through the powder particle discharge gap t to the position close to the outer cylinder 3 of the passage 5, and a rotating wheel 9 is attached to each tip of the spoke-shaped central rotary blade 8. And the rotating wheel 9 together with the spoke-shaped central rotary blade 8 can be rotated around the center line C.

  The rotating wheel 9 is provided with a plurality of inward nails 10 along the bottom plate 4 on its inner side, facing inward. Three inward claws 10 are provided between the spoke-shaped central rotary blades 8, 8 (12 in total, see FIG. 2), and the tip of the inward claw 10 crosses the annular passage 5 and is the inner side of the inner cylinder 2. It is configured to enter slightly.

  The upright rotating shaft 7 is provided with a driving motor 33 driven by an inverter motor via a speed reducer 32, and the spoke-shaped central rotary blade 8 is configured to be rotationally driven in the direction of arrow A by the motor 33. Yes.

  Accordingly, the granular material supplied to the hopper 1 flows out from the discharge gap t on the entire circumference of the lower end 2 ″ of the inner cylinder 2 into the annular passage 5 at an angle of repose angle θ (see FIG. 1). In this state, by rotating the spoke-shaped central rotary blade 8 in the direction of arrow A (see FIG. 2), the powder particles that have flowed out into the annular passage 5 are separated from the central rotary blade 8 and the above-described state. It is configured to be transferred in the direction of arrow A by the rotation of the inward claw 10 in the direction of arrow A, and to be dropped and supplied downward from the granular material discharge port 6 (see FIG. 5).

  In FIG. 1, reference numeral 38 denotes a support column for supporting the bottom plate 4, 34 denotes a support base to which the support column 38 is connected, and supports the whole powder supply apparatus, and 1 ″ denotes a raw material input port of the hopper 1. The support table 34 has a function of a platform scale, and is configured so as to be able to measure the total weight of the granular material charged into the hopper 1.

  Therefore, as the powder particles are discharged from the discharge port 6, the measured value of the platform scale gradually decreases by the amount of the powder particles discharged from the discharge port 6, and this measured value is sent to the controller 35. It is sent out as a weighing signal. The controller 35 constitutes a subtractive weighing device, and can measure the weight of the powder discharged from the discharge port 6 based on the weighing signal.

  Next, the structure which concerns on the upper surface leveling plate 15 of the granular material of the said granular material supply apparatus is demonstrated.

  As shown in FIG. 4, from the position of the plate surface of the upper disk 3 ′ corresponding to the vicinity of the upstream side edge 6 ′ of the discharge port 6, the disk 3 ′ has a square shape in the upstream direction. A cylinder support substrate 11 having a rod through hole 11a (see FIG. 3) at a substantially central portion is provided on the disk 3 ′ so as to penetrate the opening 3a and close the opening 3a. Fix horizontally with N.

  The telescopic rod 12a of the air cylinder 12 is inserted into the rod through hole 11a and the lower end thereof is positioned in the passage 5, and the air cylinder 12 is vertically supported on the cylinder support substrate 11. Then, two portions of the lower end flange 12b of the cylinder body are fixed on the cylinder support substrate 11 with bolts B and B (see FIG. 4). Thus, the cylinder 12 is vertically fixed to the cylinder support substrate 11 (see FIG. 3).

  In this state, the expansion / contraction rod 12a of the cylinder 12 is lowered vertically into the annular passage 5 of the granular material below from the cylinder support substrate 11 through the rod through hole 11a, and the expansion / contraction In the extended state of the rod 12a, as shown in FIG. 6, the lower end 12a ′ is configured to be positioned approximately in the middle of the vertical width of the passage 5, and the telescopic rod 12a is disposed in the annular passage 5. It is configured to be able to expand and contract in the vertical direction. Note that the upper and lower leveling plate 15 moves up and down between the raised position a (see FIG. 5) and the lowered position a '(see FIG. 6) by the up-and-down telescopic operation of the telescopic rod 12a.

  A support plate 13 is horizontally fixed to the lower end 12a ′ of the telescopic rod 12a of the cylinder 12 by a mounting bolt 14, and an upper surface leveling plate 15 of the granular material is provided at the downstream end of the support plate 13. Is fixed in the vertical direction with its upper end parallel to the telescopic rod 12a (see FIGS. 5 and 6).

  As shown in FIG. 3, the upper surface leveling plate 15 is composed of an upper half base portion 15a fixed to the support plate 13 and a leveling portion 15b which is wider than the base portion 15a and extends downward. As shown in FIGS. 4 and 8A, the upper surface leveling plate 15 has a plate surface 15 ′ parallel to the upstream side edge 6 ′ of the discharge port 6. And a position where the distance L between the leveling portion 15b and the side edge 6 'on the upstream side of the discharge port 6 is extremely short (the distance L is based on the width T of the spoke-shaped central rotary blade 8). The distance is short, for example, L = 10 mm to 15 mm) (see FIGS. 4, 6, and 9).

  Further, the lower end 15b ′ of the upper surface leveling plate 15 is located at the position shown in FIG. 5 (the upper position in the vertical direction of the passage 5 in FIG. When the cylinder 12 is extended downward from the position, the upper surface leveling plate close to the lowered position a ′ in FIG. 6 (the bottom plate 4 of the passage 5 in FIG. 6). 15 (position indicated by a solid line).

  Here, as shown in FIG. 6, the distance between the lower end 15 b ′ of the leveling plate 15 and the bottom plate 4 at the lowered position a ′ is h, and the outlet from the upstream end surface of the upper leveling plate 15. 6 when the distance to the upstream side edge 6 ′ is L, and when the leveling plate 15 is in the lowered position a ′, the repose angle of the granular material flowing out from the distance h in the direction of the discharge port is θ degrees, The width of the spoke-shaped central rotary blade 8 in the annular passage is defined as T (for example, the width T of the rotary blade 8 in the annular passage 5 (see FIGS. 8A and 8B)). The thickness is k (see FIG. 9).

  Here, the width T of the spoke-shaped central rotary blade 8 is based on the maximum width in the annular passage 5 (see FIG. 8A), but the width at other positions (minimum width T1, width at intermediate position). T2) may be used as a reference.

  Here, in the granular material supply device of the present invention, the lower end 15b ′ of the upper surface leveling plate 15 at the lowering position a ′ of the upper surface leveling plate 15 is upstream of the side edge 6 ′ upstream of the discharge port 6. And it is located in the immediate vicinity of the said side edge 6 ', It is characterized by the above-mentioned. Specifically, if the distance from the lower end 15 b ′ of the top leveling plate 15 to the upstream side edge 6 ′ of the discharge port 6 is L, the distance L is the width of the spoke-like rotary blade 8. It is configured to be smaller than T (or T1 or T2) (L <T (or L <T1 or L <T2), see FIG. 9).

  With this configuration, the distance L from the upper surface leveling plate 15 to the discharge port 6 is shorter than the width T of the spoke-shaped central rotary blade 8, so that it passes through the upper surface leveling plate 15. The granulated material immediately falls from the discharge port 6, and it is possible to prevent the pulsation f of the granular material from being generated at such a short distance L, and to prevent fluctuation of the granular material due to the pulsation. Accurate batch weighing can be performed.

  As shown in FIG. 6, the pulsation f of the granular material is constituted by the granular material rising in a mountain shape around the substantially upper part of the plate surface of the spoke-shaped central rotary blade 8 (see the mountain portion f1). Since the width M of the valleys (valley portions f2, f2) existing on the upstream and downstream sides forming the pulsation f is M> T, the distance L is determined from the width T of the rotary blade 8 in the annular passage 5. By making it small, the pulsation of the granular material can be prevented during the distance L, and accurate batch-type weighing can be performed.

  Furthermore, the relationship between the distance h from the lower end 15b ′ of the leveling plate 15 to the bottom plate 4 at the lowered position a ′ of the upper leveling plate 15 and the distance L is always “L> h”. In addition, the distance L is constant in the width direction of the upper surface leveling plate 15 (width direction of the side edge 6 ′ of the opening 6) (see FIG. 8A). For example, L = 10 mm to 15 mm, h = 5 mm (L = h + 5 mm, or L = h + 10 mm), T = 30 mm to 50 mm, k = 4 mm or 6 mm.

  At this time, the distance h is configured to be about 1/6 the height of the peak f1 of the granular material in FIG. 6 and lower than the height of the valley f2 of the granular material, Therefore, in the state in which the upper surface leveling plate 15 is lowered to the lowered position a ′, the pulsation f formed by the crests f1 and the valleys f2 of the granular material hits the plate surface of the upper surface leveling plate 15. A small amount of the granular material G having no pulsation is dropped and supplied from the discharge port 6 from the distance h.

  In addition, as described above, the distance L is smaller than the width T of the spoke-shaped central rotary blade 8 (L <T) and smaller than the distance M (L≈M / 6, L <M). For this reason, the pulsation is not generated until the granular material flowing out from the gap of the distance h reaches the discharge port 6.

  Further, as shown in FIG. 9, the relationship between the thickness k of the spoke-shaped central rotary blade 8 and the distance h is “h> k”. Therefore, the relationship between the distance L, the distance h, and the thickness k is “L> h> k” (T> L> h> k when the width T is included).

  Accordingly, the distance h ″ between the upper surface of the spoke-like rotating blade 8 and the lower end 15b ′ of the upper surface leveling plate 15 is extremely small, and the lower end portion 15b ′ of the upper surface leveling plate 15 is lowered at the lowered position a ′. The spoke-shaped central rotary blade 8 is configured to be positioned close to the upper surface of the spoke-shaped central rotary blade 8. For example, the distance h ″ between the lower end portion 15b ′ and the upper surface of the spoke-shaped central rotary blade 8 is It is comprised so that it may become about 4 mm-6 mm. By configuring in this way, the spoke-like rotary blade 8 passes through the proximity position of the lower end portion 15b ′ of the upper surface leveling plate 15, and the powder particles on the spoke-like rotary blade 8 are passed through the upper surface when passing. It can be scraped off by the leveling plate 15. Therefore, as in the conventional apparatus shown in FIG. 10, it is necessary to separately provide a powder scraping plate (44) for scraping the powder remaining on the upper surface of the spoke-like rotary blade 8 on the downstream side of the opening. There is no.

  When the upper surface leveling plate 15 is present at the ascending position (ascending position a), the granular material conveyed from the annular passage 5 to the discharge port 6 in the direction of arrow A is not obstructed as it is. It is dropped and supplied downward from the discharge port 6 (see FIG. 5). Further, immediately before the completion of the batch-type weighing, when the upper surface leveling plate 15 is lowered and positioned at the lowered position a ′, the upper surface portion of the granular material is the upstream plate surface of the upper surface leveling plate 15. It is blocked by 15 'and flows out from the gap of the distance h in the direction of the discharge port 6. Therefore, the pulsation of the powder is removed and the powder is uniformly leveled, and after passing through a short distance L from the gap h, a small amount of powder without causing pulsation in the range of the distance L. The body G is discharged from the gap of the distance h at a constant flow rate.

  Thus, after the upper surface leveling plate 15 is lowered, the powder particles immediately reach the discharge port 6 from the leveling plate 15 and fall downward from the discharge port 6. Accurate metering can be performed without errors.

  Furthermore, as shown in FIG. 8A, the distance L between the upstream side edge 6 ′ of the discharge port 6 and the leveling plate 15 is the width direction of the side edge 6 ′ along the side edge 6 ′. It is configured to be constant (the distance L) at any position. Therefore, after the upper surface leveling plate 15 is lowered, the powder particles flowing out to the discharge port 6 side through the distance h are, as shown by the arrow D in FIG. Since it always falls downward from the discharge port 6 through a uniform distance (L), it is possible to perform accurate measurement while suppressing variations in the amount of the granular material supplied by dropping.

  Accordingly, in the batch-type weighing, initially, the cylinder 12 is driven to be reduced, and the upper surface leveling plate 15 is positioned at the rising position a, and the cylinder 12 is used in, for example, the final stage of batch-type weighing (immediately before the completion of weighing). 6 is extended to lower the upper surface leveling plate 15 to the lowered position a ′ in FIG. 6 to remove pulsation and reduce the flow rate of the granular material, so that highly accurate measurement can be performed.

  Reference numeral 16 denotes an L-shaped position restricting piece provided at the center of the upper end of the plate surface 15 ″ on the downstream side of the leveling plate 15 (see FIG. 6).

  Reference numerals 17 and 17 ′ denote guide rails of the upper leveling plate 15 (see FIG. 4), and a common horizontal portion 17a (see FIG. 5) at the upper ends of both guide rails 17 and 17 ′ is opened from the passage 5 side to the rectangular opening. It contacts the lower surface of the cylinder support plate 11 through 3a and is fixed with bolts B from the upper surface side of the support plate 11 (see FIG. 4). These guide rails 17 and 17 ′ are arranged opposite to each other at a predetermined interval in the direction orthogonal to the plate surface 15 ″ of the leveling plate 15 on the downstream side of the upper leveling plate 15. The upstream side edge 17 ″ is in contact with the downstream plate surface 15 ″ of the leveling plate 15, and the lower end thereof reaches the substantially middle portion of the vertical height of the passage 5 (see FIG. 5).

  A stopper pin (stopper member) 18 for connecting the opposing surfaces of the guide rails 17 and 17 'is provided at the lower end of the opposing surfaces of the guide rails 17 and 17'. During the downward movement of the upper surface leveling plate 15 from the raised position a to the lowered position a ′, the downstream plate surface 15 ″ is in sliding contact with the upstream side edge 17 ″ of the guide rails 17 and 17 ′. By being guided in the up-and-down direction, it can be moved up and down stably.

  When the upper surface leveling plate 15 is lowered to the lowered position a ′, as shown in FIG. 6, the position restricting piece (engaging member) 16 is brought into contact with the stopper pin 18 from above and the position is restricted. Further, it is configured to prevent further descent. The position restricting piece 16 has an L shape, and is formed so as to protrude downstream from a plate surface 15 ″ on the downstream side of the upper surface leveling plate 15.

  Reference numeral 19 denotes a substantially spherical switch operating portion which is provided at the upper end portion of the air cylinder 12 and moves in the vertical direction based on the expansion and contraction operation of the expansion rod 12a (see FIG. 3). When the upper surface leveling plate 15 is located at the lowering position a ′, it is at the solid line position in FIG. 3, the lowering position detection limit switch L1 is turned on, and the telescopic rod 12a is contracted to reduce the upper surface leveling plate 15. Is located at the broken line position in FIG. 3 and is configured to turn on the raised position detection limit switch L2.

  The cylinder support plate 11 is extended in the radially outward direction of the outer cylinder 3 from the installation position of the air cylinder 12, and the casing 20 is fixed upright by bolts B on the extension (FIG. 3). reference).

  The rising position detection limit switch L2 is provided at the upper end of the casing 20, and the lowering position detection limit switch L1 is provided in the casing 20 below the switch L2. Each of the limit switches L1 and L2 has a support shaft 23 supported in a horizontal direction by a bearing portion 21, and a rotation arm 22 is provided on the support shaft 23 so as to be rotatable in the vertical direction. The switch actuating portion 19 is brought into contact with the distal end portion of the rotating arm 22 so that the arm 22 can be rotated to operate the limit switch L1 or L2. Reference numerals 24a and 24b denote detection units for detecting the position (position a or a ') of the upper surface leveling plate 15 based on the operation of the limit switches L1 and L2.

  Reference numerals 25 and 25 denote cylinder holding arms (see FIG. 3), which support the upper end and lower end of the main body of the air cylinder 12 with their tip portions 25a and 25a, respectively. It is held in an upright state.

  26 is a chute provided at the discharge port 6, and 27 is a slide gate portion for opening and closing the discharge port 6. A mounting flange 27b with a gate passage slit 27a is provided on the outer peripheral portion of the bottom plate 4 corresponding to the discharge port 6. A gate holding portion 29 is fixed to the mounting flange 27b so that the plate-like slide gate 28 is slidably held in the horizontal direction (arrow E, F direction), and is fixed to one end of the gate holding portion 29. A drive cylinder 31 for opening and closing the slide gate 28 in the directions of arrows E and F is provided (see FIG. 2). In FIG. 2, L3 is a limit switch for detecting the closing of the slide gate, L4 is a limit switch for detecting the opening of the slide gate, both of which are brought into contact with the operating portion provided on the side surface of the slide gate 28, The open position or the closed position of the slide gate 28 is detected.

  The controller 35 always receives a weighing signal from the platform scale. In batch weighing, the controller 35 drives the driving motor 33 to rotate the spoke-shaped central rotary blade 8 at a constant speed and from the start of weighing. In the middle of the measurement, the air cylinder 12 is in a reduced driving state, and the upper surface leveling plate 12 is in a raised position a (see FIG. 5). The controller 35 is preset with a target value P that is a target value for measurement and a proximity value S that is slightly lower than the target value P. The controller 35 is configured to output the discharge port based on the measurement signal. The weight of the granular material discharged from 6 is recognized as the measurement value Q. Then, when the measurement value Q based on the measurement signal becomes the proximity value S, the controller 35 drives the air cylinder 12 to extend and lowers the upper surface leveling plate 15 to the lowered position a ′ and simultaneously drives it. The rotational speed of the electric motor 33 is reduced (for example, 1/5 to 1/10), and thereby the rotational speed of the spoke-like rotary blade 8 is reduced. Then, the rotating blade 8 is rotated at the low speed until the measured value Q reaches the target value P, and when the measured value Q reaches the target value P, the rotation of the spoke-shaped rotating blade is stopped. It is configured to perform control.

  Since this invention is comprised as mentioned above, hereafter, the operation | movement in the case of performing batch type measurement of a granular material in the granular material supply apparatus of this invention is demonstrated. In batch-type weighing, a measurement value for one batch is set as a target value in advance, and after the start of measurement, the spoke-shaped central rotary blade 8 is rotated with the upper surface leveling plate 15 positioned at the raised position a. A large supply is performed, and the upper surface leveling plate 15 is positioned at the lowered position a ′ immediately before the completion of measurement, and the supply amount is decreased by decreasing the number of revolutions of the spoke-shaped central rotary blade 8 (small supply) to reach the target value. This is a method of stopping the rotation of the rotary blade 8 at the time, and is a measurement method that shortens the measurement time and improves the measurement accuracy.

  In the present embodiment, a powder storage bag or the like is disposed below the chute 26 of the discharge port 6 of the powder supply device to store the powder discharged from the discharge port 6.

  Further, it is assumed that the drive cylinder 31 is driven to open the slide gate 28. Further, it is assumed that the telescopic rod 12a is contracted when the air cylinder 12 is expanded and contracted, that is, the lower end of the upper surface leveling plate 15 is positioned at the raised position a. Therefore, the distance h 'is between the lower end 15b' of the upper surface leveling plate 15 and the bottom plate 4 (see FIG. 5).

  When a granular material is put into the granular material hopper 1, the granular material is discharged to the annular passage 5 from the entire circumference of the lower end 2 ″ of the inner cylinder 2 at an angle of repose θ (see the two-dot chain line in FIG. 1). In this state, the driving motor 33 is driven to rotate the spoke-shaped central rotary blade 8 at a constant speed in the direction of arrow A. Then, the powder particles discharged to the annular passage 5 are the spoke-shaped central rotary blade 8. And by the rotation of the inward claw 10 in the direction of arrow A, the inside of the annular passage 5 is transferred in the direction of arrow A, and is dropped and supplied downward from the discharge port 6.

  At this time, as shown in FIG. 5, the granular material in the annular passage 5 forms a mountain portion f <b> 1 at the upper portion of the spoke-shaped central rotary blade 8, and between the rotary blade 8 and the rotary blade 8. It is transferred in the direction of arrow A in a state in which a valley f2 is formed and a pulsation f that forms a low peak f1 ′ at the top of the inward claw 10 is formed in the valley f2, and downward from the discharge port 6 Going to fall supplied.

  The upper surface leveling plate 15 is located at the rising position a as described above, and the rising position a (the lower end 15b ′ of the upper surface leveling plate 15) is above the peak portion f1 of the granular material. The powder particles are not blocked by the upper surface leveling plate 15, and the powder particles sent by the spoke-like rotary blades 8 and the inward claws 10 are dropped and supplied from the discharge port 6 as they are. The granular material dropped and supplied from the discharge port 6 is stored and accumulated in the storage bag or the like. The weight of the granular material is measured by a platform balance of the support table 34, a measurement signal is sent to the controller 35, and the controller 35 measures the measurement value Q as the discharge amount.

  Since the granular material dropped and supplied from the discharge port 6 has pulsation f, the fall supply amount fluctuates according to the pulsation f. Does not affect the final measurement value.

  When the measured value Q of the granular material reaches a proximity value S (for example, a target value S = 29 kg immediately before the completion of measurement) close to a target value P (for example, P = 30 kg), the controller 35 This is detected, the air cylinder 12 is extended and driven, the upper surface leveling plate 15 is lowered, and the upper surface leveling plate 15 is positioned at the lowering position a ′ (see FIG. 6).

  In the extension driving of the air cylinder 12, the upper surface leveling plate 15 is guided in the vertical direction along the guide rails 17 and 17 ', so that the upper surface leveling plate 15 is vertical. Can descend accurately in the direction. Further, at the lowered position a ′, the position regulating piece 16 engages with the stopper pin 18 to prevent the upper surface leveling plate 15 from further descending, so that the leveling plate 15 is accurately lowered. That is, it is possible to accurately stop at the lowered position a ′ that forms the distance h.

  When the upper surface leveling plate 15 is positioned at the lowered position a ′, as shown in FIG. 6, the distance between the lower end 15b ′ of the upper surface leveling plate 15 and the bottom plate 4 is h, and the distance h is the above-mentioned powder and granular material. The distance L to the side edge 6 'of the discharge port 6 of the granular material flowing out from the distance h is about 1/6 of the height of the peak portion f1 and lower than the valley portion f2. (L = 10 mm), which is smaller than the width T of the spoke-shaped central rotary blade 8, and the distance L is about 1/6 of the distance M between the valleys f2 and f2 formed by one peak.

  Therefore, as shown in FIG. 6, the upper half of the granular material is blocked by the plate surface 15 ′ of the upper surface leveling plate 15 to remove pulsation and uniformly level the gap h of the distance h. A small amount of the granular material G from which pulsation has been removed in the direction of the discharge port 6 flows out. Accordingly, a small amount of the granular material G having a constant flow rate from which the pulsation has been removed is discharged from the gap of the distance h.

  Furthermore, the granular material that has flowed out of the gap of the distance h passes through a short distance L (<T), and immediately drops and is supplied downward from the discharge port 6. Therefore, the granular material flowing out from the upper surface leveling plate 15 immediately reaches the side edge 6 ′ of the discharge port 6 without causing pulsation, and is supplied by dropping from the discharge port 6.

  Therefore, from the time when the measurement value Q reaches the proximity value S (29 kg) to the target value P (30 kg), a small amount of powder without pulsation is supplied at a constant flow rate. Therefore, the control unit (controller 35) reduces the speed of the driving prime mover 33 until the target value P is reached after the measured value Q reaches the proximity value S, thereby the spoke-like shape. After the rotational speed of the central rotary blade 8 is decreased, the measurement value Q can be brought close to the target value P with very little error by performing control to stop the rotation of the central rotary blade 8.

  Further, when the upper surface leveling plate 15 is lowered, the distance between the lower end portion 15b ′ and the upper surface of the rotating spoke-like rotary blade 8 is h ″, and the lower end portion 15b ′ is located close to the upper surface of the rotary blade 8. Therefore, when the spoke-shaped rotating blade 8 passes through the leveling plate 15, the leveling plate 15 can scrape powder particles located on the upper surface of the rotating blade 8 upstream. The dropped granular material is pushed downstream (in the direction of arrow A) by the next spoke-shaped central rotary blade 8 and the inward claw 10 and is dropped and supplied from the discharge port 6, so that there is no need to provide a separate scraping plate. , The granular material can be discharged without waste.

  Thereby, the batch type measurement of the target value P can be realized with extremely high accuracy.

  7 and 8 (b) show another embodiment of the powder and particle supply device according to the present invention, and the same and corresponding parts as those of the embodiment shown in FIGS. 4 and 8 (a). Are denoted by the same reference numerals. In the other embodiment, the upstream side edge 6 ′ of the discharge port 6 is inclined from the outer cylinder 3 toward the inner cylinder 2 with respect to the traveling direction (arrow A direction) of the granular material. The upper leveling plate 15 is also inclined from the outer cylinder 3 toward the inner cylinder 2 so that the plate surface is parallel to the inclined side edge 6 '. . The upper surface leveling plate 15 is fixed to the support plate 13 at the lower end 12a 'of the telescopic rod 12a of the air cylinder 12 with the inclination angle. Since the structure other than the inclined side edge 6 'and the upper surface leveling plate 15 parallel to the side edge 6' is the same as that of the above-described embodiment of FIG.

  Also in this other embodiment (see FIG. 8B), the upstream of the discharge port 6 from the lower end 15b ′ of the upper surface leveling plate 15 is the same as the above-described embodiment shown in FIGS. 4 and 8A. Assuming that the distance to the side edge 6 ′ is L, the distance L is smaller than the width T of the spoke-like rotary blade 8 in the annular passage 5, and always “L> h”, The distance L is configured to be constant over the width direction of the side edge 6 ′ of the discharge port 6.

  Therefore, also in the other embodiment, as shown in FIG. 8B, the distance L between the upstream side edge 6 ′ of the discharge port 6 and the leveling plate 15 is equal to the side edge 6 ′. Since it is constant (the distance L) at any position in the width direction of the side edge 6 ′ along the line, the powder flowing out to the discharge port 6 side through the distance h after the upper surface leveling plate 15 is lowered. Since the body falls downward from the discharge port 6 through a uniform distance (L) from the top leveling plate 15, it is possible to perform accurate measurement while suppressing variations in the amount of the granular material supplied by dropping. It can be done. Thus, also in the other embodiment, the same effect as the above embodiment can be obtained. In addition, according to the other embodiment, as the discharge port 6 goes from the upstream side (the side edge 6 ′ side) to the downstream side, the area of the opening gradually increases from the narrow state. A small amount of powder particles can be concentrated and supplied from a narrow opening, and more accurate batch-type weighing can be performed.

  In the granular material supply apparatus shown in FIG. 4, the target value P = 30 kg and the proximity value S = 29 kg are set in the control unit (controller 35), and the measurement value Q in the controller 35 is set to the proximity value under the control of the controller 35. The top leveling plate 15 was positioned at the raised position a until S = 29 kg, and the spoke-shaped central rotary blade 8 was rotated at a constant speed (large supply).

  Thereafter, when the measurement value Q reaches the proximity value S = 29 kg under the control of the controller 35, the upper surface leveling plate 15 is lowered to the lowered position a ′, and the rotational speed of the spoke-shaped central rotary blade 8 is increased. The spoke-shaped central rotary blade 8 is stopped when the measured value Q reaches the target value P. Actually, the rotation of the rotary blade 8 is stopped immediately before the measurement value Q reaches the target value P for head correction.

  The measurement value Q is 30.03 kg for the first time, and 30.015 kg for the second time. The error for the first time is 0.03 kg and the weighing accuracy is 1/1000 (0.1%). The error for the second time is 0.015 kg. A measurement accuracy of 1/2000 (0.05%) could be realized.

  As a comparative example, when the same measurement was performed in the conventional granular material supply apparatus of FIG. 10, the measurement value Q was 30.15 kg for the first time, 30.09 kg for the second time, and the error for the first time of the comparative example was 0. The weighing accuracy was 1/200 (0.5%) at .15 kg, and the second error of the comparative example was 0.09 kg, and the weighing accuracy was 1/300 (0.3%).

  As a result, according to the granular material supply apparatus according to the present invention, it was possible to achieve a significant improvement in measurement accuracy in batch measurement as compared with the conventional granular material supply apparatus.

  As described above, according to the present invention, when the upper surface leveling plate 15 is positioned at the lowered position a ′, the powder particles pass through the upper surface leveling plate 15 and the upper surface is leveled. Without any pulsation after leveling, so that a small amount of granular material is dropped and supplied from the discharge port 6 without pulsation. Batch weighing can be performed.

  Further, when the upper surface leveling plate 15 is lowered, the upper surface of the spoke-shaped central rotary blade 8 passes through a position close to the lower end of the upper surface leveling plate 15. The granular material located on the upper surface of the spoke-shaped central rotary blade 8 can be scraped off by the upper surface leveling plate 15, and there is no need to provide a scraping plate on the downstream side of the discharge port 6 unlike the conventional apparatus.

  In addition, since the upper surface leveling plate 15 can be moved up and down along the guide plates 17 and 17 ′, the upper surface leveling plate 15 can be stably moved up and down.

  Further, when the upper surface leveling plate 15 is positioned at the lowering position a ′, the lowering position a ′ can be regulated by the stopper member 18, so that the upper surface leveling plate 15 can be stopped at an accurate position, The upper leveling plate 15 can be driven up and down accurately.

  According to the granular material supply apparatus of the present invention, since accurate batch-type weighing can be performed, it can be widely used for accurate measurement of various granular materials.

2 Inner cylinder 2 "Lower end 3 Outer cylinder 4 Bottom plate 5 Annular passage 6 Discharge port 6 'Upstream side edge 8 Spoke-shaped rotary blade 15 Upper surface leveling plate 15b' Lower end 17, 17 'Guide rail 18 Stopper pin a Ascending position a 'Descent position h Distance k Thickness L Distance T Width t Dispensing gap θ Angle of repose

Claims (5)

A payout gap is provided for discharging the powder particles in the inner cylinder from the lower end in the inner cylinder to form an angle of repose in the annular passage in the outer cylinder,
A discharge port for the granular material that is transferred through the annular passage by a plurality of spoke-shaped central rotary blades that rotate along the bottom plate is provided,
Further, an upper surface leveling plate of the granular material is disposed in the annular passage upstream of the discharge port, and the upper surface of the granular material transferred through the annular passage is leveled by the upper surface leveling plate. In the granular material supply apparatus configured as described above,
The upper surface leveling plate is provided so as to be movable up and down between an ascending position and a descending position,
The installation position of the top leveling plate is in the immediate vicinity of the upstream side edge of the discharge port,
At the lowered position of the upper surface leveling plate, the distance from the bottom plate to the lower end of the upper surface leveling plate is h, and the distance from the lower end of the upper surface leveling plate to the upstream side edge of the discharge port is L, the distance L is smaller than the width T of the spoke-shaped central rotary blade in the annular passage,
The powder supply apparatus, wherein “L> h” is always satisfied, and the distance L is constant over the width direction of the upstream side edge of the discharge port.   2. The granular material supply device according to claim 1, wherein the spoke-shaped central rotary blade has a relationship of “L> h> k” where k is a thickness.   When the spoke-shaped central rotating blade passes below the upper-surface leveling plate at the lowered position of the upper-surface leveling plate, the lower end of the upper-surface leveling plate is close to the upper surface of the spoke-shaped central rotating blade. The granular material supply device according to claim 1 or 2, wherein Fixing the guide plate along the plate surface of the upper surface leveling plate in the annular passage,
The granular material supply apparatus according to any one of claims 1 to 3, wherein the upper surface leveling plate is configured to be moved up and down along the guide plate. A stopper member is provided on the guide plate, and an engagement member that engages the stopper member is provided on the upper surface leveling plate.
5. When the upper surface leveling plate is lowered to the lowered position, the engaging member abuts against the stopper member and restricts further lowering of the upper surface leveling plate. The granular material supply apparatus described in 1.

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