WO2019220854A1 - バッチ計量供給装置及びその運転方法 - Google Patents
バッチ計量供給装置及びその運転方法 Download PDFInfo
- Publication number
- WO2019220854A1 WO2019220854A1 PCT/JP2019/016598 JP2019016598W WO2019220854A1 WO 2019220854 A1 WO2019220854 A1 WO 2019220854A1 JP 2019016598 W JP2019016598 W JP 2019016598W WO 2019220854 A1 WO2019220854 A1 WO 2019220854A1
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- WIPO (PCT)
- Prior art keywords
- discharge port
- primary
- raw material
- scraper
- weighing
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/54—Gates or closures
- B65D90/58—Gates or closures having closure members sliding in the plane of the opening
- B65D90/582—Gates or closures having closure members sliding in the plane of the opening having a rotational motion
- B65D90/585—Gates or closures having closure members sliding in the plane of the opening having a rotational motion around an axis perpendicular to the valve port
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
- G01G13/02—Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism
- G01G13/04—Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism involving dribble-feed means controlled by the weighing mechanism to top up the receptacle to the target weight
- G01G13/08—Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism involving dribble-feed means controlled by the weighing mechanism to top up the receptacle to the target weight wherein the main feed is effected by mechanical conveying means, e.g. by belt conveyors, by vibratory conveyors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/26—Hoppers, i.e. containers having funnel-shaped discharge sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/26—Hoppers, i.e. containers having funnel-shaped discharge sections
- B65D88/28—Construction or shape of discharge section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/54—Large containers characterised by means facilitating filling or emptying
- B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
- B65D88/68—Large containers characterised by means facilitating filling or emptying preventing bridge formation using rotating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/54—Gates or closures
- B65D90/58—Gates or closures having closure members sliding in the plane of the opening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
- B65G65/48—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems
- B65G65/4809—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems rotating about a substantially vertical axis
- B65G65/4836—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems rotating about a substantially vertical axis and moving material over a stationary surface, e.g. sweep arms or wheels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
- G01G13/24—Weighing mechanism control arrangements for automatic feed or discharge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
- B65G2201/042—Granular material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2811/00—Indexing codes relating to common features for more than one conveyor kind or type
- B65G2811/09—Driving means for the conveyors
- B65G2811/095—Speed variation control means
- B65G2811/096—Speed variation control means without reversal of the conveying direction
Definitions
- the present invention relates to a supply device for powder and the like equipped with an elevating scraper, and more particularly to a batch measurement supply device capable of performing batch type measurement with high accuracy and an operation method thereof.
- a powder and granular supply device has an inner cylinder for supplying powder through a gap on a bottom plate, and a lower end of an outer cylinder that shares a center line with the inner cylinder is connected to the inner and outer sides of the bottom plate.
- An annular passage is formed between the cylinders, and the granular material is allowed to flow out from the gap to the annular passage at a constant angle of repose.
- a discharge port is provided in the annular passage, and a central rotating shaft is provided in the center of the bottom plate.
- a rotating blade (spoke) is provided, an outer peripheral rotating ring is provided at the tip of the central rotating blade along the inner peripheral surface of the outer cylinder, a plurality of inward claws are provided on the rotating ring, and the powder particles that have flowed out into the annular passage
- the granular material is quantitatively discharged from the discharge port (for example, Patent Document 1).
- the device of Patent Document 2 is an improved version of the device of Patent Document 1, and is provided with a lifting scraper at one location just before the discharge port, and when the measured scraper is approached, the lifting scraper is lowered.
- the accuracy of batch weighing is increased, and a constant weighing accuracy can be obtained in batch weighing.
- the present invention provides a batch weighing supply device and a method of operating the same that can dramatically improve the batch weighing accuracy compared to the conventional device by providing a lifting scraper in two stages as compared with the conventional device.
- the purpose is to provide.
- an inner cylinder is provided on the circular bottom plate with a common central axis at a predetermined interval
- an outer cylinder is provided concentrically with the inner cylinder on the circular bottom plate
- an annular passage is formed between the inner and outer cylinders.
- the raw material in the inner cylinder is discharged from the lower end of the inner cylinder to the annular passage side with a predetermined angle of repose, and a plurality of rotating blades rotating on the circular bottom plate are provided on the central axis,
- the annular passage is provided with a discharge port for a raw material transferred through the annular passage by the rotary blade, and provided with a measuring means for the raw material discharged from the discharge port
- a primary lifting scraper is provided on the upstream side of the discharge port to reduce the transport amount of the raw material that is transported at the time of lowering.
- a secondary lifting scraper for further reducing the transport amount is provided, and both the primary and secondary lifting scrapers are provided at both side edges at positions spaced apart from both side surfaces of the annular passage by the above-mentioned exhaust.
- An inclined edge that intersects the rotary blade is formed at the upstream edge of the outlet, and the secondary lifting scraper is provided along the inclined side edge, and the rotating blade is moved when the primary lifting scraper is lowered.
- a batch metering and feeding device is provided, which is provided with a slide gate that can open and close the material dropping path at a chute provided below the discharge port.
- the rotary blade can be constituted by, for example, a spoke-shaped central rotary blade (8) and an inward blade (10).
- the weighing means can be constituted by, for example, a load cell (12), an adding means (38), a granular material weight calculating means (37q), and the like.
- the raw material is, for example, a granular material.
- the said control means can be comprised by a control part (37), for example.
- shoot part can be comprised by a chute
- the inclined side edge of the discharge port has an inner circumference counterclockwise with respect to a radial line of the circular bottom plate passing through the opening start point with respect to the opening start point upstream of the discharge port.
- the first side scraper is formed by inclining the side corners to the downstream side by a predetermined angle, and the primary lifting scraper is provided by the batch metering and feeding device according to the first aspect, wherein the annular passage is provided in a direction orthogonal to the direction of raw material passage. Composed.
- the inclined side edge of the discharge port intersects with the rotating blade in an inclined state, the amount of the material dropped from the discharge port compared to a conventional discharge port having a side edge substantially parallel to the rotating blade. (For example, the instantaneous discharge amount is about 1/5 of the conventional amount), and more accurate measurement can be performed.
- the secondary lifting scraper is provided in the immediate vicinity of the inclined side edge along the inclined side edge, the raw material that prevents the pulsating flow of the raw material such as the granular material and falls from the inclined side edge to the discharge port Can be reduced evenly.
- storage means for storing set values, primary set values, and secondary set values for batch weighing is provided, and the primary, secondary ascending and descending scrapers, the rotating blades, the slide gate Control means is provided, and the control means lowers the primary lifting scraper and lowers the rotational speed of the rotating blades based on the fact that the measured value has reached the primary set value from the normal weighing operation.
- a secondary reduction operation is performed, and the secondary lifting scraper is lowered based on the measured value having reached the secondary set value, and the rotational speed of the rotary blade is reduced to be lower than that during the primary reduction operation.
- the badge weighing and supplying device according to (1) or (2) is configured to perform a reduction operation and stop the rotation of the rotary blades based on the measured value becoming the set value.
- the primary reduction operation movement which lowers the primary raising / lowering scraper and reduces the rotation speed of a rotary blade will be performed, and also a measurement value will be set to a secondary setting value.
- the secondary reduction operation of further reducing the rotational speed of the rotary blades can be performed to reduce the discharge amount and discharge speed of the raw material used for weighing in two stages. This makes it possible to achieve extremely accurate batch weighing.
- the weighing means includes a load cell for weighing the entire weight of the badge weighing and supplying device, and based on the total weight of the device obtained from the load cell, the raw material discharged from the discharge port.
- the measuring means includes a measuring device installed below the discharge port, and the weight of the raw material discharged from the discharge port is calculated based on the measured value obtained from the measuring device.
- the batch metering device according to any one of (1) to (3), which is to be recognized.
- the batch weighing can be performed with extremely high accuracy.
- the slide gate is configured by the batch metering and feeding device according to the fourth aspect, which is provided at a position near the circular bottom plate in the chute portion.
- the slide gate is configured by the batch metering and supplying device according to the above (5) and fifth, which is provided at a position close to the meter below the chute.
- the rotary blade always stops at the position of the inclined side edge of the discharge port at the end of the batch weighing operation. Can be completed in a state that is within, so that a very accurate weighing operation can be realized.
- an inner cylinder is provided on the circular bottom plate with a common central axis at a predetermined interval
- an outer cylinder is provided concentrically with the inner cylinder on the circular bottom plate
- an annular passage is provided between the inner and outer cylinders.
- the raw material in the inner cylinder is discharged from the lower end of the inner cylinder to the annular passage side with a predetermined angle of repose, and a plurality of rotating blades rotating on the circular bottom plate are formed on the central axis.
- a method of operating a batch metering and feeding apparatus wherein the annular passage is provided with a discharge port for the raw material transferred through the annular passage by the rotary blade, and provided with a means for measuring the raw material discharged from the discharge port
- a primary lifting scraper for reducing the transport amount of the raw material that is transported to the upstream side of the discharge port in the annular passage, and a downstream side of the primary lifting scraper, which is closest to the discharge port.
- a step of performing a normal weighing operation in which the rotary blades are rotationally driven at a position to supply the raw material, and the raw material is dropped from the discharge port; and when the measured value reaches a primary set value, the 1 Ascending A step of performing a primary reduction operation of lowering the scraper to reduce the conveyance amount of the raw material and reducing the rotational speed of the rotary blades, and when the measured value reaches the secondary set value, A step of performing a secondary reduction operation for further reducing the conveying amount of the raw material by lowering the lifting scraper and further reducing the rotational speed of the rotary blade, and when the measured value reaches the set value, And a step of stopping the rotation of the blades and closing the slide gate to stop the dropping of the raw material from the discharge port.
- the present invention it is possible to reduce the discharge amount of the raw material used for weighing and the speed of the rotary blades in two stages, to suppress spilling of powder particles, and to realize extremely accurate batch weighing. .
- the amount of the material falling from the discharge port can be reduced (for example, about 1/5 compared to the conventional), and more accurate weighing can be performed. It can be carried out.
- the pulsating flow of the raw material discharged from the discharge port can be prevented, and the raw material falling from the inclined side edge to the discharge port can be reduced evenly.
- batch weighing can be performed with extremely high accuracy regardless of whether the weighing method is the weight loss batch weighing method or the post-design amount method.
- the rotating blade At the end of the batch weighing operation, the rotating blade always stops at the position of the inclined side edge of the discharge port, so that the weighing in the batch weighing operation is within the range of the position of the inclined side edge of the discharge port. It can be completed in a certain state, so that a very accurate weighing operation can be realized.
- the upper end flange 2 ′ of the inner cylinder 2 is connected to the flange 1 ′ of the lower end opening of the cylindrical hopper 1, and the central axis C is shared by the bolt B (see FIG. 2). Install concentrically.
- the outer cylinder 3 sharing the central axis C with the inner cylinder 2 is integrally fixed to the outer surface of the inner cylinder 2 via an annular disk 3 '.
- the direction of rotation of the spoke-shaped central rotary blade 8 is the direction of arrow A
- 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”.
- the outer edge 4 ′ of the circular 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 circular bottom plate 4 constituting the lower surface of the passage 5.
- a discharge port 6 for powder particles is provided, and the annular disk 3 ′ closes the upper surface of the annular passage 5.
- the discharge port 6 is not a conventional substantially square discharge port, but the upstream side edge of the substantially square exhaust port has an inclined side edge 6 ′ inclined to the downstream side. It has a shape. That is, the inner and outer peripheral edges of the discharge port 6 are provided along the circumferential direction of a circle centered on the center line (center axis) C, and are slightly longer than the radius of the inner cylinder 2 centering on the center line C. An inner arcuate side edge 6a along the circumference of a circle of radius and an outer arcuate side edge 6a 'around the center line C and along the circumference of a circle of radius similar to that of the outer cylinder 3. Is done.
- the upstream side edge has an inner peripheral side corner P ′ at a predetermined angle ⁇ ′ with respect to a radial line L passing through the opening start point P and the center line C with the opening start point P at the outer peripheral side corner as a reference point.
- the inclined side edge 6 ′ is formed by inclining downstream.
- the downstream side edge is formed as a side edge 6 ′′ that bisects the outer arcuate side edge 6a ′ to the left and right and is parallel to the radial line L ′ that passes through the center line C.
- the lower end 2 ′′ (see FIG. 1) of the inner cylinder 2 is brought close to the circular bottom plate 4, and the powder particle discharge gap (discharge gap) is provided between the lower end 2 ′′ of the inner cylinder 2 and the upper surface of the circular bottom plate 4.
- t is provided.
- the upper end portion 7 of the upright rotating shaft 7 ′ sharing the center line C protrudes on the circular bottom plate 4, and the four spoke-shaped central rotary blades 8 are 90 degrees along the bottom plate 4 at the upper end portion 7. (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 blades 10 along the circular bottom 4 on its inner side, facing inward.
- Three inward blades 10 are provided between the spoke-shaped central rotary blades 8 and 8 (12 in total, see FIG. 2), and the tip of the inward blade 10 crosses the annular passage 5 inside the inner cylinder 2. It is configured to enter slightly.
- the spoke-shaped central rotary blade 8, the bottom surfaces of the inward blades 10, and the top surface of the circular bottom plate 4 are extremely narrow, and the spoke-shaped central rotary blade 8 and the inward blades 10 are It is comprised so that it can rotate, without contacting the upper surface of the circular bottom board 4.
- the upright rotating shaft 7 ′ is provided with a drive motor 33 by an inverter motor via a speed reducer 32, and the spoke-shaped central rotary blade 8 and the inward blade 10 are rotationally driven in the direction of arrow A by the drive motor 33. It is configured as follows.
- 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 ⁇ (see FIG. 1).
- 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.
- the inward blade 10 is configured to be transferred in the direction of the arrow A in the annular passage 5 by the rotation in the direction of the arrow A, and fall and be supplied downward from the granular material discharge port 6 (FIGS. 3 and 3). 13).
- the entire batch weighing and feeding machine including the hopper 1 has a load cell stand 11 fixed to a machine frame (not shown) that is erected and fixed on the ground, for example.
- the load cell is placed on the load cell support 11 via load cells 12, 12, and 12, and the load cell 12, 12, 12 is used to measure the weight of the entire feeder to discharge from the discharge port 6. It is comprised so that the weight of the supplied raw material can be recognized.
- the description of the load cell 12 and the like will be described later.
- the conventional outlet has the upstream side edge and the downstream side edge formed in parallel as shown in FIG. 9, but the outlet 6 according to the present invention has the conventional outlet.
- the upstream side is formed as an inclined side edge 6 ′.
- the spoke-shaped central rotary blade 8 or the inward blade 10 passes through the inclined side edge 6 'of the discharge port 6 while rotating in the direction of arrow A, the spoke-shaped central rotary blade 8 or the inward blade 10 is From the opening start point P of the inclined side edge 6 ′ to the inner peripheral corner P ′, the inclined side edge 6 ′ intersects with the spoke-shaped rotating blade 8 or the inward blade 10 in an inclined state, and therefore the inclined side edge 6 ′.
- the discharge port 6 by the intersection of the rotary blade 8 or the inward blade 10 with the inclined side edge 6 ′ from the opening start point P of the upstream end to the inner peripheral corner P ′ of the downstream end.
- the opening area gradually increases from a small area to a large area.
- the opening area P Reduces the amount of powder particles falling to the peripheral corner P 'to about 1/5. Therefore, it is possible to greatly reduce the amount of powder particles falling from the discharge port 6. Therefore, compared with a conventional device that performs measurement in a state where a relatively large amount of powder particles are falling. In addition, since it is possible to measure in a state where a small amount of powder particles are falling, the accuracy of batch weighing can be improved.
- the relationship between the distance a between the rotating blades and the circumferential distance a ′ of the inclined side edge 6 ′ may be a ′ ⁇ a.
- a ′ is a length that bisects the outer arcuate side edge 6a ′ of the discharge port 6, but a ′ is not limited to a length that bisects the outer arcuate side edge 6a ′.
- the length of the edge 6a ′ may be shorter than the length that bisects the length, or may be longer than the length that bisects the side edge 6a ′.
- an opening 3 a is provided through the disc 3 ′ in the vicinity of the upstream side from the inclined side edge 6 ′ on the upstream side of the discharge port 6, and the opening 3 a is closed.
- a cylinder support substrate 13 is fixed with bolts B on the annular disk 3 '.
- a primary cylinder 14 is erected and supported upstream from the inclined side edge 6 ′, and is close to the inclined side edge 6 ′ (inclined side edge 6 ′). Further, the secondary cylinder 15 is supported upright on the upstream side.
- the telescopic rod 14a of the primary cylinder 14 is located on the lower side of the annular disk 3 '(in the annular passage 5) through the through hole of the cylinder support substrate 13, and is horizontally supported by the telescopic rod 14a.
- a primary lifting scraper 17 serving as an upper surface leveling plate of the granular material is fixed vertically via the member 16.
- the primary lifting scraper 17 is a plate-like body as shown in FIG. 5, and a wide portion 17a is provided on the inner peripheral side of the lower part.
- the primary lifting scraper 17 is provided in a direction along a radial line L ′′ passing through the central axis C, so that it traverses the annular passage 5 in the radial direction (in the rotational direction A of the spoke-like rotary blades 8). As shown in FIG. 5, it is provided so that it can be raised and lowered between the rotating wheel 9 in the annular passage 5 and a flow rate adjusting ring 31 provided outside the inner cylinder 2. It has been.
- the primary lifting scraper 17 When the ascending / descending scraper 17 is lifted, as shown in FIGS. 3 and 5, the primary lifting scraper 17 is in a position (position r ⁇ b> 1 in FIGS. 3 and 5) that does not obstruct the granular material passing through the annular passage 5. Yes, at the time of descent, the position is reduced by 70% with respect to the total amount (100%) of the granular material passing through the annular passage, that is, 70% is dammed and 30% of the total amount passes (FIG. 3, (Position r2 in FIG. 5). The primary lifting scraper 17 is moved up and down by expanding and contracting the telescopic rod 14 a by the primary cylinder 14. The distance from the opening starting point P upstream of the discharge port 6 to the primary lifting scraper 17 is, for example, about 100 mm.
- the telescopic rod 15a of the secondary cylinder 15 is located below the annular disk 3 ′ (in the annular passage 5) through the through hole of the cylinder support substrate 13, and is horizontally supported by the telescopic rod 15a.
- a secondary lifting scraper 19 is fixed vertically via a member 18 as an upper surface leveling plate of the granular material.
- the secondary lifting scraper 19 is a plate-like body as shown in FIG. 6, and a wide portion 19a is provided on the inner peripheral side of the lower portion. As shown in FIG. 4, the secondary lifting scraper 17 is parallel to and nearest to the inclined side edge 6 ′ along the inclined side edge 6 ′ upstream of the discharge port 6 (from the inclined side edge 6 ′). In an upstream state, for example, at a position separated by about 5 mm, in a tilted state (similar to the tilted side edge 6 ', a tilted state of about 40 to 60 degrees counterclockwise from the radial line L passing through the opening origin P, In this embodiment, it is provided at 40 degrees).
- the secondary lifting scraper 19 is moved up and down by extending and retracting the telescopic rod 15 a by the secondary cylinder 15.
- the secondary lifting scraper 19 is provided in the immediate vicinity of the inclined side edge 6 'along the inclined side edge 6' of the discharge port 6, powder particles flowing out from the secondary lifting scraper 19 when descending.
- the pulsating flow of the body material can be prevented, and the material falling from the inclined side edge 6 ′ to the discharge port 6 can be reduced evenly. That is, the secondary lifting scraper 19 further reduces the amount of material transport reduced by the lowering of the primary lifting scraper 17 on the downstream side of the primary lifting scraper 17 and immediately upstream of the discharge port 6. It is provided so that it can.
- the secondary lifting scraper 19 is provided in parallel to the inclined side edge 6 'of the discharge port 6 as described above, the lifting and lowering is also performed while maintaining the state parallel to the inclined side edge 6' ( (See FIG. 4). Therefore, in the state where the secondary lifting scraper 19 is lowered, 20% of the total amount of powder particles by passing the spoke-shaped central rotary blade 8 or the inward blade 10 in the direction of arrow A with respect to the inclined side edge 6 ′. Although the body will fall downward from the inclined side edge 6 ′, even when discharging this granular material, compared to a discharge port having a side edge parallel to the conventional radial line L ′, Similarly, the amount of instantaneous fall of the granular material is reduced to about 1/5.
- the spoke-shaped central rotary blade 8 and the inward blade 10 gradually drop the granular material that has passed through the secondary lifting scraper 19 from the discharge port 6 while obliquely intersecting the inclined side edge 6 ′.
- the amount of instantaneous drop of particles can be reduced to about 1/5 of the conventional amount.
- Guide rails 20 and 21 are provided along the primary lifting scraper 17 and the secondary lifting scraper 19, and stopper pins 20 a and 21 a are provided on the guide rails 20 and 21.
- stopper members 14c and 15c are provided at the lower ends of the telescopic rods 14a and 15a. When the scrapers 17 and 19 are lowered, the stopper members 14c and 15c are engaged with the stopper pins 20a and 21a, so that the scrapers 17 and 19 can be accurately stopped at a predetermined lowered position. .
- the primary cylinder 14 is provided with a pair of limit switches 30a up and down, and the secondary cylinder 15 is also provided with a pair of limit switches 30b up and down.
- the control unit 37 (described later) detects signals from above or below these limit switches 30a or 30b, so that the primary lifting scraper 17 or the secondary lifting scraper 19 is in the raised position or the lowered position. It is comprised so that it can detect whether there exists.
- a cylindrical chute 25 is fixed to the lower side of the discharge port 6 (the lower surface of the circular bottom plate 4), and the radial line is disposed outside the chute 25.
- a slide gate mounting machine frame 26 is fixed in the outer radial direction along L ′.
- An air-type cylinder 27 is fixed horizontally at an end of the mounting machine frame 26, and an extendable rod 27a of the cylinder 27 can be expanded and contracted in the horizontal direction in the machine frame 26.
- a plate-like slide gate 24 is horizontally fixed to the distal end portion of the telescopic rod 27a, and the slide gate 24 can close the discharge port 6 when the telescopic rod 27a is extended. .
- Reference numeral 28 denotes a chute adjusting plate, which is vertically adjusted so that the lower end of the lower variable plate 28a is positioned on the upper surface of the slide gate 24 when closed, and the variable plate 28a is bolted at that position. It is comprised so that it can fix with B. Normally, the telescopic rod 27a of the cylinder 27 is contracted to open the discharge port 6, but when the metering is finally finished, the telescopic rod 27a is extended to the chute 25 (raw material dropping path). ) Is closed so that predetermined batch weighing can be performed.
- reference numeral 34 denotes a pair of limit switches
- the control unit 37 is configured to detect whether the slide gate 24 is closed or opened based on the state of the limit switch 34. .
- horizontal plates 22, 22, 22 are radially fixed to the outer periphery of the cylindrical hopper 1 at the same height every 120 degrees in the circumferential direction (see FIG. 2).
- the mounting portions 22a, 22a, 22a on the lower surfaces of the horizontal plates 22, 22, 22 are fixed on the rectangular load cell cradle 11 fixed on the ground G with a machine frame (not shown). It is mounted on the load cells 12, 12, 12. Accordingly, three load cells 12, 12, 12 are also provided for every 120 degrees in the circumferential direction of the hopper 1. Of the three load cells 12, 12, 12, 12, two load cells are provided on connecting rods 11 ′, 11 ′ provided inside the rectangular load cell cradle 11. , 12 are installed on the load cell bases 12a, 12a, 12a.
- Reference numeral 35 denotes a reinforcing plate between each horizontal plate 22 and the peripheral wall of the hopper 1.
- the weight of all the constituent members described above including the hopper 1, the inner and outer cylinders 2, 3 connected to the hopper 1, and the hopper 1 are supplied.
- the weight of the powder is acting. That is, all the weights of the batch metering and feeding device including the weight of the raw material charged into the hopper 1 are weighed. Therefore, the initial weights of the load cells 12, 12, and 12 are detected and stored, and during the weighing operation, the total weight of the batch metering device is subtracted from the initial weight and discharged from the discharge port 6.
- the weight of the raw material can be calculated (hereinafter, this method is referred to as “subtraction batch weighing”).
- the slide gate 24 is provided as close to the circular bottom plate 4 as possible in order to reduce the amount of the powdered raw material falling after the operation is stopped. Therefore, as shown in FIG. 3, the slide gate 24 may be provided at a position slightly downward from the circular bottom plate 4, but as shown in FIG. 1, the slide gate 24 is provided directly below the circular bottom plate 4. It is good also as a structure to provide. 3 and 4, reference numeral 36 denotes a fixed scraper provided in the discharge port 6 on the downstream side of the inner peripheral corner P ′, and the upper end is fixed to the annular disk 3 ′.
- the lower end of the fixed scraper 36 is provided at a position close to the upper surface of the spoke-shaped central rotary blade 8 or the inward blade 10 (for example, the inward blade 10 'in FIG. 3) that has passed through the inner peripheral corner P'. (See FIG. 3), the upper limit of the granular material laminated on the rotary blade 8 or the inner peripheral blade 10 is scraped off, and the excess granular material is dropped downward through the discharge port 6. .
- reference numeral 37 denotes a control unit, to which the load cells 12, 12, 12 are connected, the primary and secondary cylinders 14, 15 and their limit switches 30a, 30b, and the slide gate drive.
- a cylinder 27, its limit switch 34, a drive motor 33 for driving the central rotary blade, and an operation panel 39 for various settings are connected.
- the control unit 37 is a programmable controller, and stores a program shown in the operation procedure shown in FIG. 12.
- a microcomputer built in accordance with the program is based on the measurement signal from each load cell 12. The next cylinders 14 and 15, the cylinder 27, and the drive motor 33 are controlled.
- the control unit 37 recognizes the total value of the three load cells 12, 12, and 12 by a signal from the adding means 38 (FIG. 11), so that the batch metering supply always including the powder as the raw material is performed.
- the total weight of the machine (initial total weight) can be grasped.
- the weight of the granular material discharged from the discharge port 6 is obtained by subtracting the measured weight sent from the adding means 38 from the initial total weight by the granular material weight calculating means 37q. It is comprised so that it can recognize.
- the drive motor 33 (for example, induction motor) performs variable voltage variable frequency control using an inverter, and the motor drive means 37p of the control unit 37 performs variable control of the rotation speed of the drive motor 33 by changing the frequency. Do.
- FIG. 11 is a functional block diagram showing the function of the control unit 37, and the function will be described together with the following operation description.
- the raw material to be weighed is a raw material consisting of granular material, “10 kg” as the set weight for one batch weighing operation, the lowering of the primary lifting scraper 17 and the timing of primary deceleration of the drive motor 33.
- the measurement value (primary setting value) is “9.44 kg”
- the measurement value (secondary setting value) at the timing when the secondary lifting scraper 19 is lowered and the drive motor 33 is secondarily decelerated is “9.92 kg”.
- the operator inputs each measurement value from the operation panel 39.
- the control unit 37 stores “10 kg” in the internal set value storage unit 37f, “9.44g” in the primary set value storage unit 37d, and the above-mentioned in the secondary set value storage unit 37e. Store “9.92 kg”.
- the frequency proportional to the rotational speed of the drive motor 33 during normal metering operation is 60 Hz (normal rotational speed), and the frequency proportional to the rotational speed during primary reduction operation is 20 Hz (first speed), secondary reduction operation.
- the frequency proportional to the rotational speed at the time is 6 Hz (second speed)
- the first speed (frequency) is described in the first speed storage means 37m
- the second speed (frequency) is the second speed. It is assumed that it is stored in the speed storage means 37n.
- the normal rotation speed, the first speed, and the second speed are not limited to these, and can be arbitrarily determined according to the properties of the raw materials.
- the raw material granular material is charged into the hopper 1, and the charged granular material reaches from the circular bottom 4 to the vicinity of the upper portion in the hopper 1, and the lower end 2 of the inner cylinder 2. "From the entire circumference or substantially the whole circumference to the annular passage 5 side at a repose angle ⁇ .
- the primary lifting scraper 17 and the secondary lifting scraper 19 are both in the raised position (positions r1 and r3) (see FIG. 13), the slide gate 24 is in the open state, and the discharge port 6 It is assumed that, for example, a powder container (not shown) is set below the extension chute 29 below the container.
- the operation before lowering the primary lifting scraper 17 is “normal operation” or “normal weighing operation” until the primary lifting scraper 17 is lowered and the secondary lifting scraper 19 is lowered.
- the operation is referred to as “primary reduction operation”, and the operation until the set value is measured by lowering the secondary lifting scraper 19 and finally the drive motor 33 is stopped is referred to as “secondary reduction operation”.
- the control unit 37 (motor driving means 37p) rotates the drive motor 33 at a normal rotation speed (for example, 60 Hz) (see FIG. 12, S1, normal operation). Therefore, the spoke-shaped central rotary blade 8 and the inward blade 10 rotate in the direction of arrow A at a rotation speed (for example, 1.4 rpm) corresponding to 60 Hz.
- the granular material discharged into the annular passage 5 is conveyed in the direction of arrow A by the spoke-shaped central rotary blade 8 and the inward blade 10 in the annular passage 5, reaches the discharge port 6, and reaches the discharge port 6. Are sequentially discharged downward.
- the granular material discharged from the discharge port 6 falls downward through the chute 25 and the extended chute 29, and is dropped and supplied into the granular material storage container installed below the extended chute 29. .
- the primary and secondary lifting scrapers 17 and 19 are located at the ascending positions (r1, r3), the granular material transported in the annular passage 5 is not blocked at all. It falls downward from the discharge port 6.
- emission amount of the granular material at this time is about 500 g / sec (refer FIG. 13).
- the spoke-like rotating blade 8 and the inward blade 10 pass through the inclined side edge 6 ′ on the upstream side, but while passing through the inclined side edge 6 ′, the powder particles are always inclined. Will fall downward from the inclined side edge 6 '. That is, since the granular material gradually falls from the outer peripheral side to the inner peripheral side of the annular passage 5 due to the inclined side edge 6 ', during this time, the instantaneous fall of the granular material falling downward from the discharge port 6 The amount is about 1/5 of the conventional outlet. Therefore, when the spoke-shaped central rotary blade 8 and the inward blade 10 pass through the inclined side edge 6 ′, the amount of the powder particles falling downward from the discharge port 6 is smaller than that of the conventional device. Become.
- Such a dropping operation of the granular material is repeated every time the rotary blade 8 or the inward blade 10 passes through the discharge port 6 (inclined side edge 6 ').
- the dropping operation of the raw material from the discharge port 6 is almost completed until the spoke-shaped rotary blade 8 and the inward blade 10 pass through the inclined side edge 6 ′, and thereafter the spoke-shaped rotary blade. 8 and the above inward blades 10, these blades 8 and 10 ′ are rotated in the direction of arrow A (see FIG. 13 etc.).
- the spoke-shaped central rotary blade 8 or the inward blade 10 crosses the inclined side edge 6 ′ of the discharge port 6, the next inward blade 10 or the rotary blade 8 successively moves the inclined side edge 6 ′. Will cross. Therefore, the amount of the granular material dropped from the discharge port 6 becomes a small amount until the rotary blade 8 or the inward blade 10 reaches the inner peripheral corner P ′ from the upstream opening starting point P. Such a small amount of dropping supply operation is repeated. In this way, even during normal operation, a small amount of powder is dropped, so that more accurate weighing operation can be performed as compared with the conventional device.
- the amount of fall is a small amount (about 1/5) compared with the conventional case, so the amount of fall of the granular material is abrupt. Therefore, it is possible to perform more accurate badge measurement without causing pulsation or the like.
- the control unit 37 determines whether or not the powder body weight reaches the primary set value (9.44 kg in the case of the present embodiment) stored in the primary set value storage means 37d. Is determined (see S3 in FIG. 12).
- the control unit 37 primary set value discriminating means 37a
- the control unit 37 (primary cylinder driving means 37g) drives the primary cylinder 14 to lower the primary lifting scraper 17 (see FIGS. 12, S4, and 14). ).
- the control unit 37 reads the first speed from the first speed storage means 37m simultaneously with the lowering operation of the primary lifting scraper 17, and the primary motor speed reduction means 37h
- the drive frequency of the drive means 37p is set to 20 Hz (1/3 of the initial frequency), for example, and the rotational speed of the drive motor 33 is reduced (in this embodiment, 0.47 rpm which is 1/3 of the initial rotational speed). (Refer to FIG. 12, S5, primary reduction operation).
- the primary lifting scraper 17 When the primary lifting scraper 17 is lowered to the position r2, as shown in FIG. 14, the upper part (substantially 70% of the total amount) of the granular material conveyed through the annular passage 5 is dammed up, and the primary lifting scraper is From the space between the lower end of 17 and the upper surface of the circular bottom plate 4, about 30% of the total amount of the granular material is conveyed downstream.
- the rotational speed of the drive motor 33 becomes 1/3 (about 0.47 rpm) at the same time when the scraper 17 is lowered, the rotational speeds of the spoke-shaped central rotary blade 8 and the inward blade 10 are reduced to 1/3.
- the granular material that has passed through the primary lifting scraper 17 is conveyed more slowly than the normal operation in the direction of arrow A by the spoke-shaped central rotary blade 8 and the inward blade 10 whose rotational speed is reduced. Accordingly, the amount of the granular material dropped and supplied downward from the discharge port 6 is reduced to 30% from the normal operation, and the amount per unit time dropped and supplied from the discharge port 6 is also reduced. At this time, the discharge amount of the granular material discharged from the discharge port 6 is reduced to about 40 g / sec.
- the powder particles also flow out from the gaps on both side edges of the primary scraper 17 (gap S, S in FIG. 5), but since there is a distance to the discharge port 6, the powder particles are stable during that time.
- the detection accuracy is not adversely affected (see FIG. 14).
- the spoke-shaped central rotary blade 8 and the inward blade 10 pass through the inclined side edge 6 ′ of the discharge port 6 and traverse to reach the inclined side edge 6 ′. Is reduced to 30% so far, and the rotational speed of the spoke-shaped central rotary blade 8 and the inward blade 10 is reduced to 1/3. Both the falling speed and discharge amount of the granular material are reduced, and in the primary reduction operation, a small amount of 40 g of granular material is discharged per second after reaching the primary set value (9.44 kg). It will follow. Accordingly, it is possible to perform an accurate weighing operation as compared with the conventional device.
- control unit 37 sets the weight of the powder to the secondary set value (9.92 kg in the case of the present embodiment) stored in the secondary set value storage means 37e. It is determined whether or not it is reached (see S6 in FIG. 12). When the discharge operation proceeds and the control unit 37 (secondary set value discriminating unit 37b) determines that the powder body weight has reached the secondary set value, that is, 9.92 kg from the discharge port 6. When the granular material is discharged, the control unit 37 (secondary cylinder driving means 37i) drives the secondary cylinder 15 to lower the secondary lifting scraper 19 (see FIGS. 12, S7, and 15).
- the control unit 37 (secondary motor speed reduction means 37j) reads the second speed from the second speed storage means 37n simultaneously with the lowering operation of the secondary lifting scraper 19, and sets the driving frequency of the motor driving means 37p. For example, 6 Hz (1/10 of the initial frequency) is set, and the rotational speed of the drive motor 33 is further reduced (in this embodiment, 0.14 rpm, which is 1/10 of the initial rotational speed) (FIG. 12). , S8, secondary reduction operation).
- the secondary lifting scraper 19 When the secondary lifting scraper 19 is lowered to the position r4, as shown in FIG. 15, the upper part (approximately 80% of the total amount) of the granular material conveyed through the annular passage 5 is dammed, and the secondary lifting scraper is From the space between the lower end of 19 and the upper surface of the circular bottom plate 4, about 20% of the total amount of powder is discharged, and the powder is immediately discharged from the upstream inclined side edge 6 ′ of the discharge port 6. It will be dropped and supplied downward.
- the amount of the granular material dropped and supplied downward from the discharge port 6 is reduced to 20% of the initial amount, and the discharged amount of the granular material discharged from the discharge port 6 is about 8 g per second.
- the granules are slowly dropped from the outlet 6 (see FIG. 15).
- the secondary lifting scraper 19 is lowered, some powder particles flow out from both side edges of the scraper 19 (see FIG. 6) and spill into the discharge port 6.
- the amount of the granular material carried out has already been reduced to about 30% due to the lowering of the primary lifting scraper 17, the amount of the granular material is reduced at once by the lowering of the one-step lifting scraper as in the prior art.
- the granular material spilling from the both side edges (gap S, S) of the secondary lifting scraper 19 to the discharge port 6 can be reduced to about 10% or less (compared to the conventional art).
- the secondary lifting scraper 19 As described above, after the secondary lifting scraper 19 is lowered, a very small amount of powder is supplied, so that the final set value can be measured accurately. In the state where both scrapers 17 and 19 of the two stages are lowered, finally, the amount of instantaneous fall of the granular material falling from the discharge port 6 is smaller than the stage where both of the scrapers 17 and 19 are rising. It can be reduced to about 0.4%.
- the secondary lifting scraper 19 is provided in an inclined state immediately before the inclined side edge 6 ′ of the discharge port 6 and in parallel with the inclined side edge 6 ′ (see FIG. 4), the scraper 19 Thus, the granular material reduced to 20% is immediately dropped and supplied from the inclined side edge 6 '. Therefore, during the secondary reduction operation, the occurrence of a pulsating flow such as an increase or decrease in the amount of powder particles is prevented, and extremely accurate measurement can be performed.
- the control unit 37 determines whether or not the weight of the granular material reaches the set value (10 kg in this embodiment) stored in the set value storing unit 37f ( (See FIG. 12, S9).
- the control means 37 set value determining means 37c determines that the weight of the powder has reached the set value of 10 kg, that is, 10 kg of powder is discharged from the discharge port 6.
- the control unit 37 (motor drive unit 37p) stops the drive motor 33 (see S10 in FIG. 12), and the control unit 37 (slide gate closing unit 37k) also drives the slide gate 24 to slide the slide gate. 24 is closed (see FIG. 12, S11, FIG. 3). By closing the slide gate 24 at the same time as the completion of the measurement in this way, the amount of wasteful dropping of the granular material is reduced, and the measurement accuracy can be improved.
- the spoke-shaped central rotary blade 8 and the inward blade 10 sequentially pass through the inclined side edge 6 ′ on the upstream side of the discharge port 6. Since the circumferential length a of the side edge 6 ′ and the distance a ′ between the rotary blades are set to the same distance, when the drive motor 33 is stopped, the spoke-shaped central rotary blade 8 or the inward blade 10 is It will stop at any position (position between the upstream opening start point P and the inner peripheral side corner P ′) on the upstream inclined side edge 6 ′ of the discharge port 6, The rotation of the rotary blades 8 and the inward blades 10 is stopped in a state where a small amount of body supply is maintained. Therefore, extremely accurate badge weighing can be performed.
- control unit 37 raises the primary lifting scraper 17 and the secondary lifting scraper 19 (see FIG. 12, S12). If not finished (see FIG. 12, S13), the control unit 37 returns to the initial step S1 and continues to the next step. Perform batch weighing operation.
- FIGS. 16 to 18 show a second embodiment of a batch metering and feeding apparatus according to the present invention.
- the first embodiment is a subtractive batch metering system, whereas the post-design is shown in FIG.
- the quantity method is adopted.
- the post-design amount method is a method in which a measuring device 42 is provided at the subsequent stage of the discharge port 6, and powder particles discharged from the discharge port 6 are directly measured by the measuring device 42.
- the second embodiment only the measurement method is different, and the other configuration is the same as that of the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the basic configuration is the same. Those descriptions are omitted.
- the first embodiment measures the total device weight by the load cells 12, 12, and 12 and calculates the powder weight from the reduced weight of the total device weight.
- the granular material discharged from the discharge port 6 is directly weighed by a measuring instrument 42 (see FIG. 18) including an electronic scale installed below the discharge port 6. Therefore, the badge metering device according to the second embodiment does not have the configuration related to the load cells 12, 12, 12 in the first embodiment (the load cell support 11 around the hopper 1, the reinforcing plate 35, etc.).
- a leg portion 41 is provided on the lower surface of the circular low platen 4 so that the badge metering device is supported on the base 44 with the leg portion 41, and below the extended chute 29 of the discharge port 6.
- a measuring instrument 42 is installed, and a powder storage container 43 is placed on the measuring instrument 42, and the weight of the powder as a raw material dropped and supplied from the discharge port 6 is measured by the measuring instrument 42. To do.
- the chute 25 is formed long and the slide gate 24 is provided as close to the measuring instrument 42 as possible.
- the weighing instrument 42 is connected to a control unit 37, and the measurement value of the weighing instrument 42 is supplied to a primary set value discriminating means 37a, a secondary set value discriminating means 37b, and a set value discriminating means 37c.
- the primary lifting scraper 17 and the secondary lifting scraper 19 are lowered, and the rotational speed of the drive motor 33 is decreased in two stages.
- the accurate batch weighing operation is performed by closing the slide gate 24 simultaneously with the set value.
- the batch weighing operation can be performed with a much higher accuracy than in the past, as in the first embodiment. It is.
- the set value was 10 kg and 9.44 kg was weighed after about 19 seconds after operation, the primary lifting scraper 17 was lowered, the frequency of the drive motor 33 was set to 20 Hz, and the rotation speed was reduced to 1/3. After that, since 9.92 kg was weighed after about 8 seconds, the secondary lifting scraper 19 was lowered, the frequency of the motor was set to 6 Hz, and the rotation speed was reduced to 1/10 of the original. Thereafter, since 10 kg was weighed after about 10 seconds, the drive motor 33 was stopped, the slide gate 24 was closed, the primary and secondary lifting scrapers 17 and 19 were raised, and the weighing was completed.
- the shape of the discharge port is a conventional substantially square discharge port in which the upstream side edge and the downstream side edge are parallel to each other (there is no inclined side edge 6 'in the present invention), the primary lifting and lowering of the present invention.
- a conventional apparatus in which a scraper 17 does not exist and a single lifting scraper is provided in the immediate vicinity of the side edge on the upstream side of the discharge port. (Error 0.3%)
- the second time was 10.05 kg (error 0.5%).
- the above-mentioned measurement accuracy is performed for comparison, and is not an absolute accuracy but a relative one to the last.
- the accuracy of the badge metering device of the present invention is not limited to the accuracy of the above-described embodiment, because it varies depending on the particle size, shape, properties, etc. of the powder as the raw material to be conveyed. Therefore, depending on the properties of the raw material, the weighing accuracy of the badge weighing supply device of the present invention may be equal to or less than the above, but the badge weighing of the present invention is compared with the weighing accuracy when using the conventional device. According to the supply device, highly accurate weighing can be realized.
- the present invention it is possible to reduce the discharge amount and discharge speed of the raw material to be metered over two stages. For example, even if the granular material has poor fluidity, it can be removed from both edges of the scraper of the granular material. Suppressing spillage and achieving extremely accurate batch weighing. That is, the accuracy of batch weighing can be dramatically improved.
- the amount of the raw material falling from the discharge port 6 can be reduced (for example, about 1/5 compared to the conventional), and more accurately. Accurate weighing.
- the pulsating flow of the raw material discharged from the discharge port 6 can be prevented, and the raw material falling from the inclined side edge 6 'to the discharge port can be reduced evenly.
- batch weighing operation can be performed with extremely high accuracy regardless of whether the weighing method is the weight reduction batch weighing method or the post-design amount method.
- reference numeral 23 denotes a raw material charging portion.
- the batch metering and supply apparatus of the present invention can perform extremely accurate batch-type metering, and thus can be widely used for precise metering of various types of granular materials.
- Inner cylinder 2 Inner cylinder 2 "Lower end 3 Outer cylinder 4 Circular bottom 5 Circular passage 6 Discharge port 6 'Inclined side edge 8 Spoke-shaped central rotary blade 10 Inward blade 12 Load cell 17 Primary lifting scraper 19 Secondary lifting scraper 24 Slide gate 25 Chute 29 Extension chute 37 Control unit 37d Primary set value storage means 37e Secondary set value storage means 37f Set value storage means 42 Meter t Discharge interval ⁇ Repose angle L Radius line P Opening point P ′ Inner peripheral corner
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Abstract
Description
第1に、円形底盤上に中心軸を共通に所定間隔を介して内筒が設けられ、上記円形底盤上に上記内筒に同心に外筒が設けられ上記内外筒間に環状通路が形成され、上記内筒内の原料が該内筒の下端から上記環状通路側に所定の安息角を以って払い出され、上記中心軸に上記円形底盤上を回転する複数の回転羽根が設けられ、上記環状通路には上記回転羽根によって上記環状通路内を移送される原料の排出口が設けられ、該排出口から排出される原料の計量手段が設けられたバッチ計量供給装置において、上記環状通路内に、上記排出口の上流側に下降時に搬送される原料の搬送量を減少させる1次昇降スクレーパが設けられ、上記1次昇降スクレーパの下流側で上記排出口の直近の上流側に上記1次昇降スクレーパの下降にて減少された原料の搬送量をさらに減少させる2次昇降スクレーパが設けられ、上記1次及び2次昇降スクレーパは共にそれらの両側縁は、上記環状通路の両側面から一定距離離間した位置に設けられており、上記排出口の上流側の縁部は上記回転羽根に交差する傾斜側縁が形成され、上記2次昇降スクレーパは上記傾斜側縁に沿って設けられており、上記1次昇降スクレーパの下降時に上記回転羽根の回転速度を通常回転速度より遅い第1の速度に低下させ、上記2次昇降スクレーパの下降時に上記回転羽根の回転速度を上記第1の速度よりも遅い第2の速度に低下させる制御手段が設けられ、上記排出口の下に設けられたシュート部に原料落下経路を開閉し得るスライドゲートが設けられたものであるバッチ計量供給装置により構成される。
図7、図8に示すように、上記排出口6の下側(上記円形底盤4の下面)には、筒状のシュート25が固定されており、該シュート25の外側には、上記半径線L’に沿って外半径方向にスライドゲート取付機枠26が固定されている。上記取付機枠26の端部にはエア式のシリンダー27が水平に固定されており、当該シリンダー27の伸縮ロッド27aが上記機枠26内において水平方向に伸縮し得るように構成されている。そして、上記伸縮ロッド27aの先端部に板状のスライドゲート24が水平に固定されており、上記伸縮ロッド27aの伸長時に上記スライドゲート24が上記排出口6を閉鎖し得るように構成されている。
同図において、37は制御部であり、上記ロードセル12,12,12が接続されると共に、上記1次及び2次シリンダー14,15、及びこれらのリミットスイッチ30a,30b、上記スライドゲート駆動用のシリンダー27、そのリミットスイッチ34、上記中央回転羽根を駆動する駆動モータ33、各種設定用の操作パネル39が接続されている。上記制御部37はプログラマブルコントローラであり、図12に示す動作手順に示すプログラムを記憶しており、上記プログラムに従って内臓するマイクロコンピュータが、上記各ロードセル12からの計量信号に基づいて、1次及び2次シリンダー14,15、上記シリンダー27、上記駆動モータ33を制御するものである。
設定値 周波数 回転数 排出量
通常動作 10kg 60Hz 1.4rpm 500g/sec
1次低減動作 9.44kg 20Hz 0.47rpm 40g/sec
2次低減動作 9.92kg 6Hz 0.14rpm 8g/sec
上記条件で10kgのバッチ計量を行ったところ、1回目は、計量値Q=10.004kg、2回目は計量値Q=10.001kgを得ることができた。従って、計量精度は、0.04%(1回目)、0.01%(2回目)に大幅に向上することができた。1回の計量の要した時間は37秒であった。尚、本実施形態のバッジ計量供給装置によると、設定値に対する計量誤差(計量精度)を0.01%~0.1%程度まで安定的に高めることができた。
排出口の形状は従来の上流側の側縁と下流側の側縁が平行の従来の略方形の排出口(本発明における傾斜側縁6’はない)、本発明の1次昇降スクレーパ17が存在せず、排出口の上流側の側縁の直近に単一の昇降スクレーパを設けた従来装置にて、同一原料で、10kgの計量を行ったところ、1回目は10.03kg(誤差0.3%)、2回目は10.05kg(誤差0.5%)であった。
2” 下端
3 外筒
4 円形底盤
5 環状通路
6 排出口
6’ 傾斜側縁
8 スポーク状中央回転羽根
10 内向羽根
12 ロードセル
17 1次昇降スクレーパ
19 2次昇降スクレーパ
24 スライドゲート
25 シュート
29 延長シュート
37 制御部
37d 1次設定値記憶手段
37e 2次設定値記憶手段
37f 設定値記憶手段
42 計量器
t 排出間隔
θ 安息角
L 半径線
P 開口起点
P’ 内周側隅部
Claims (9)
- 円形底盤上に中心軸を共通に所定間隔を介して内筒が設けられ、上記円形底盤上に上記内筒に同心に外筒が設けられ上記内外筒間に環状通路が形成され、上記内筒内の原料が該内筒の下端から上記環状通路側に所定の安息角を以って払い出され、上記中心軸に上記円形底盤上を回転する複数の回転羽根が設けられ、上記環状通路には上記回転羽根によって上記環状通路内を移送される原料の排出口が設けられ、該排出口から排出される原料の計量手段が設けられたバッチ計量供給装置において、
上記環状通路内に、上記排出口の上流側に下降時に搬送される原料の搬送量を減少させる1次昇降スクレーパが設けられ、上記1次昇降スクレーパの下流側で上記排出口の直近の上流側に上記1次昇降スクレーパの下降にて減少された原料の搬送量をさらに減少させる2次昇降スクレーパが設けられ、
上記1次及び2次昇降スクレーパは共にそれらの両側縁は、上記環状通路の両側面から一定距離離間した位置に設けられており、
上記排出口の上流側の縁部は上記回転羽根に交差する傾斜側縁が形成され、上記2次昇降スクレーパは上記傾斜側縁に沿って設けられており、
上記1次昇降スクレーパの下降時に上記回転羽根の回転速度を通常回転速度より遅い第1の速度に低下させ、上記2次昇降スクレーパの下降時に上記回転羽根の回転速度を上記第1の速度よりも遅い第2の速度に低下させる制御手段が設けられ、
上記排出口の下に設けられたシュート部に原料落下経路を開閉し得るスライドゲートが設けられたものであるバッチ計量供給装置。 - 上記排出口の上記傾斜側縁は、上記排出口の上流側の開口起点を基準として、上記開口起点を通る上記円形底盤の半径線に対して反時計方向に内周側隅部が所定角度下流側に傾斜することにより形成され、
上記1次昇降スクレーパは上記環状通路を原料の通過方向に対して直交方向に設けられている請求項1記載のバッチ計量供給装置。 - バッチ計量の設定値と1次設定値と2次設定値を記憶する記憶手段が設けられると共に、上記1次、2昇昇降スクレーパ、上記回転羽根、上記スライドゲートの制御手段が設けられ、
上記制御手段は、通常計量動作から、計量値が1次設定値になったことに基づいて上記1次昇降スクレーパを降下すると共に、上記回転羽根の回転速度を低下する1次低減動作を行い、上記計量値が2次設定値になったことに基づいて上記2次昇降スクレーパを降下すると共に、上記回転羽根の回転速度を上記1次低減動作時よりも低下する2次低減動作を行い、上記計量値が上記設定値になったことに基づいて、上記回転羽根の回転を停止するように構成されたものである請求項1又は2記載のバッジ計量供給装置。 - 上記計量手段は上記バッジ計量供給装置の全体重量を計量するロードセルを具備しており、上記ロードセルから得られる装置全体重量に基づいて、上記排出口から排出された原料の重量を算出するものである請求項1~3の何れかに記載のバッチ計量供給装置。
- 上記計量手段は上記排出口下方に設置された計量器を具備しており、上記計量器から得られる計量値に基づいて、上記排出口から排出された原料の重量を認識するものである請求項1~3の何れかに記載のバッチ計量供給装置。
- 上記スライドゲートは上記シュート部における上記円形底盤に近い位置に設けられているものである請求項4記載のバッチ計量供給装置。
- 上記スライドゲートは上記シュート部における下方の上記計量器に近い位置に設けられているものである請求項5記載のバッチ計量供給装置。
- 上記回転羽根と上記回転羽根との間の回転羽根間距離をa、上記排出口の上記傾斜側縁の周方向長さをa’とすると、a’≧aの関係を有するものである請求項1~7の何れかに記載のバッチ計量供給装置。
- 円形底盤上に中心軸を共通に所定間隔を介して内筒が設けられ、上記円形底盤上に上記内筒に同心に外筒が設けられ上記内外筒間に環状通路が形成され、上記内筒内の原料が該内筒の下端から上記環状通路側に所定の安息角を以って払い出され、上記中心軸に上記円形底盤上を回転する複数の回転羽根が設けられ、上記環状通路には上記回転羽根によって上記環状通路内を移送される原料の排出口が設けられ、該排出口から排出される原料の計量手段が設けられたバッチ計量供給装置の運転方法であって、
上記環状通路内に、上記排出口の上流側に下降時に搬送される原料の搬送量を減少させる1次昇降スクレーパと、上記1次昇降スクレーパの下流側で上記排出口の直近の上流側に上記1次昇降スクレーパの下降にて減少された原料の搬送量をさらに減少させる2次昇降スクレーパと、上記排出口からの原料の落下を停止するスライドゲートと、上記計量手段の計量値に基づいて、上記回転羽根、上記1次、2次昇降スクレーパ、上記スライドゲートを駆動制御する制御手段と、バッチ計量の設定値、1次設定値及び2次設定値を記憶する記憶手段とが設けられ、
上記排出口はその上流側の縁部が上記回転羽根と交差する傾斜側縁として形成されており、
上記制御手段は、計量値が上記1次設定値になるまでは、上記1次昇降スクレーパと上記2次昇降スクレーパを共に上昇させた位置で上記回転羽根を回転駆動して原料の供給を行い、上記排出口から原料の落下供給を行う通常計量動作を行うステップと、
上記計量値が1次設定値になった時点で、上記1次昇降スクレーパを下降して原料の搬送量を減少させると共に、上記回転羽根の回転速度を減少させる1次低減動作を行うステップと、
上記計量値が上記2次設定値になった時点で、上記2次昇降スクレーパを下降して原料の搬送量をさらに減少させると共に、上記回転羽根の回転速度をさらに減少させる2次低減動作を行うステップと、
上記計量値が上記設定値になった時点で、上記回転羽根の回転を停止すると共に、スライドゲートを閉鎖して上記排出口からの原料の落下を停止するステップと、
を行うことを特徴とするバッチ計量供給装置の運転方法。
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