JP6076183B2 - Operation method of powder storage tank device - Google Patents

Description

  The present invention relates to a method of operating a granular material storage tank device for storing granular particles, particularly difficult-to-discharge granular materials.

  Conventionally, in granular storage devices such as feed and grain silos, depending on the contents and environmental conditions, the granular materials are consolidated by compaction due to powder pressure in the storage tank, and the load on the discharge mechanism is large. In some cases, it became impossible to operate the discharge mechanism.

  In such a case, by applying an impact from the outside, such as hitting the side surface of the storage tank section, the powder particles that are the contents in the storage tank section are loosened and discharged. Patent Document 1 discloses that a deformable plate is provided on the side surface of the discharge mechanism, and the plate is deformed by changing the external pressure to discharge the powder from the discharge port. Patent Document 2 discloses that a funnel-shaped wall surface at the bottom of the discharge mechanism is formed of an elastic body, and powder is discharged by applying a deformation force to the elastic body. Further, Patent Document 3 discloses that a rotating shaft provided in a direction perpendicular to the discharging direction of the powder is provided with a stirring unit, and the powder is discharged using the stirring unit.

JP 2006-298629 A JP 2010-260616 A JP 2010-6402 A

  By the way, in the granular material, since it is easy to consolidate and its caking force is strong, there exists a granular material (difficult-to-discharge granular material) that is difficult to discharge. However, the above-mentioned patent documents do not disclose an effective discharge method for difficult-to-discharge powder particles.

  An object of the present invention is to provide a method for operating a granular material storage tank device for smoothly discharging granular particles stored in a storage tank section.

  The present invention changes the properties of the granular material around the discharging mechanism by temporarily operating the discharging mechanism during the charging of the granular material, reduces the initial load at the start of discharging operation, The problem is solved by imparting fluidity.

That is, the operation method of the granular material storage tank device of the present invention includes a storage tank part for storing the granular material, an input mechanism for supplying the granular material from the upper part of the storage tank part, and a spiral raking blade in the storage tank part. A discharge mechanism that discharges the granular material from the lower portion of the storage tank portion by the rotational movement of the spiral scraping blade, and the discharge mechanism at the start of discharge of the granular material in the storage tank portion by the discharge mechanism Is a method for operating a granular material storage tank device that performs jog operation that repeatedly repeats the inching and stopping of the rotational movement of the spiral scraping blade, wherein the discharge operation of the granular material in the storage tank portion is performed by the discharge mechanism. during introduction into the that by the shooting mechanism the powder or granular material of the reservoir portion to take the absence, temporarily stops the insertion of the powder or granular material, the helical scraping blade to discharge of the powder grain material Rotate in the opposite direction It said discharge mechanism after operating a predetermined time as, the closing mechanism to resume-on of the granular material by, and performing the insertion of the powder or granular material to a target height.

  Moreover, the operating method of the granular material storage tank device of the present invention is characterized in that the predetermined time is 15 seconds to 2 minutes.

  Moreover, the operating method of the granular material storage tank device of the present invention is such that the amount of the granular material charged into the storage tank portion by the charging mechanism is 1 to 10% with respect to the maximum amount that can be charged into the storage tank portion. At this time, it is characterized in that the charging of the granular material is temporarily stopped.

In addition, the operation method of the granular material storage tank device of the present invention includes a storage tank unit for storing the granular material, an input mechanism for supplying the granular material from the upper part of the storage tank unit, and a spiral raking blade in the storage tank unit. And a discharging mechanism that discharges the granular material from the lower portion of the storage tank portion by the rotation of the spiral scraping blade, and when the discharging mechanism starts discharging the granular material in the storage tank portion, the discharging mechanism The operation method of the powder storage device that performs jog operation that repeats the inching and stopping of the rotational movement of the spiral scraping blade, and does not perform the discharge operation of the powder in the storage unit by the discharge mechanism wherein when the input mechanism to introduce the powder or granular material to a target height in the reservoir portion, the helical scraping blade is filled by the powder or granular material granular material which is charged into the reservoir portion is turned from the start of the when To date, wherein the helical scraping blade to operate the discharge mechanism to rotate in a direction opposite to the direction in which to discharge of the powder or granular material.

  According to the operation method of the granular material storage tank device of the present invention, the granular material stored in the storage tank can be discharged smoothly.

It is the schematic which shows the granular material storage tank apparatus which concerns on embodiment of this invention. It is a figure which shows the relationship of the hydraulic pressure-elapsed time in Example 1. FIG. 5 is a diagram illustrating a relationship between hydraulic pressure and elapsed time in Comparative Example 1. FIG. It is a figure which shows the relationship of the hydraulic pressure-elapsed time in the comparative example 2.

  Hereinafter, an operation method of the granular material storage tank device according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a granular material storage tank device according to an embodiment. The granular material storage tank device 2 includes a silo 4 that is a storage tank unit for storing granular particles. In addition, an insertion port 6 is provided at the top of the silo 4 to input the granular material, and the granular material is input from the input port 6 by an input mechanism (not shown). In addition, a discharge device 8 which is a discharge mechanism for discharging the powder and granular material is provided at the lower part of the silo 4.

  The silo 4 has a cylindrical straight body portion having a predetermined diameter and a predetermined height at the upper portion, and a funnel portion having a funnel shape whose diameter gradually decreases toward the bottom portion at the lower portion. The shape of the silo 4 is not limited to this shape, and if the lower portion is a funnel shape, the upper portion may be a polygonal cylinder shape such as a square tube, a hexagonal tube, or an octagonal tube.

  The discharge device 8 provided at the lower part of the silo 4 has a hopper 10 and a spiral raking blade 12 for discharging the powder particles to the outside through a slide gate 18 for discharging the powder particles. Here, the spiral scraping blade 12 includes a shaft 14 that can rotate about a central axis n extending in the longitudinal direction, and the scraping blade 20 constituting the spiral scraping blade 12 is disposed in the longitudinal direction of the shaft 14 around the shaft 14. It is provided in a spiral shape. One end portion of the shaft 14 of the spiral scraping blade 12 is fixed to a substantially central portion of the funnel portion of the silo 4, and the other end portion is disposed to face the inner wall direction of the straight body portion of the silo 4. Here, the shaft 14 is installed substantially parallel to the wall surface of the funnel portion of the silo 4.

  The spiral scraping blade 12 is configured to be rotatable in the direction of the arrow r about the central axis n of the shaft 14 by the driving force of the hydraulic motor 26. The rotation in the direction opposite to the direction of the arrow r is also possible. In this embodiment, the rotational movement in the direction of the arrow r, that is, the rotational movement in the direction in which the powder is scraped to the hopper 10 is normal. Rotational movement in the direction opposite to the direction of rotation or arrow r is called reverse rotation.

  The shaft 14 is configured to be rotatable about the central axis m of the silo 4 by a driving force of a hydraulic motor (not shown). Here, the spiral scraping blade 12 rotates together with the hopper 10 and the hydraulic motor 26 around the central axis m, for example, in the direction of the arrow s.

  The silo 4 and the hopper 10 are cylindrically removed, and the granular material conveyed by the spiral raking blade 12 flows into the hopper 10. The granular material that has flowed into the hopper 10 is discharged to the outside of the granular material storage device 2 by opening the slide gate 18, and is conveyed to a place of use by a chain conveyor, a pipe, or the like.

  Hereinafter, in this embodiment, the rotational motion about the central axis n of the spiral scraped blade 12 may be referred to as rotation, and the rotational motion about the central axis m may be referred to as revolution. In this embodiment, the spiral raking blade 12 rotates in the normal rotation direction during the discharging operation in this embodiment, unless otherwise specified.

  As a general property of the powder, it solidifies when consolidated. The granular material stored in the silo 4 is subjected to powder pressure according to the storage tank height of the granular material. Here, when calculating the powder pressure at each storage tank height with a general silo diameter (inner diameter) using Janssen's formula, the powder pressure received by the granular material increases as the storage tank height increases. When the predetermined storage tank height is exceeded, even if the increase in the storage tank height is constant, the increasing rate of the powder pressure becomes small.

  In the operation method of the granular material storage tank device 2 according to this embodiment, when the granular material is charged into the silo 4 from the charging port 6, the charging is temporarily stopped during the charging, and the charging is stopped. The discharging device 8 is operated. That is, after a small amount of granular material is introduced into the silo 4 so that the entire spiral raking blade 12 is covered, that is, the amount of granular material charged is 1 of the maximum amount of granular material that can be charged into the silo 4. When the amount reaches -10%, preferably 1% to 5%, the charging of the granular material from the charging port 6 into the silo 4 is temporarily stopped. Then, the hydraulic motor 26 is driven for a short time (one minute) so that the spiral scraping blade 12 rotates in the direction opposite to the direction in which the powder particles are discharged (hereinafter referred to as the reverse direction). In this case, the revolution movement of the spiral raking blade 12 is not performed. Thereafter, the rotational movement of the spiral scraping blade 12 is stopped, and the charging of the powder and granule from the charging port 6 into the silo 4 is resumed, and the charging of the granular material is continued until the target storage tank height is reached. When discharging the granular material from the silo 4, the slide gate 18 is opened and the discharge device 8 is activated to perform jog operation, that is, the inching and stopping of the spiral raking blade 12 and the load applied to the spiral raking blade 12. However, after discharging the discharge device 8 a plurality of times until it falls below a preset load so as not to damage the discharge device 8, the discharge device 8 causes the spiral scraping blade 12 to rotate and revolve, thereby discharging the granular material. Do.

  In this way, when the operation of the discharge device 8 is performed for a short time so that the powder particle is temporarily stopped and the spiral scraping blade 12 rotates in the reverse direction during the charging of the powder into the silo 4. In the course of charging the granular material, the granular material in the vicinity of the spiral raking blade 12 of the discharging device 8 can be crushed. Further, as described above, when the storage tank height of the granular material in the silo 4 exceeds a predetermined storage tank height, even if the increase in the storage tank height is constant, the increase rate of the powder pressure becomes small, Even when powder is further charged into the silo 4 after the discharge device 8 is temporarily operated during the charging of the powder into the silo 4, the once broken powder is solidified again. Never do.

  In addition, since the powder that has not been crushed by temporarily operating the discharge device 8 maintains the consolidated state and weakens the powder pressure applied to the crushed powder, the discharge device 8 is temporarily turned on. Even when the granular material is further charged into the silo 4 after the operation, the once pulverized granular material is not firmly consolidated again.

  Therefore, according to the operation method of the granular material storage tank device 2 according to this embodiment, the initial load when starting the discharge device 8 can be reduced, and the flow of the granular material required when the discharge operation of the discharge device 8 is started. Therefore, the number of jog operations required at the start of the discharge operation can be reduced, the time until the discharge of the granular material in the silo 4 can be shortened, and the powder can be smoothly smoothed. The body can be discharged. This is particularly effective when storing a hardly dischargeable granular material in the granular material storage device.

  In addition, in the operating method of the granular material storage tank device 2 according to this embodiment, the granular material stored in the granular material storage device 2 is not particularly limited. D. G. S (Distiller's Dred Grains with Solubles), cereal skins such as wheat bran, and non-dischargeable granular materials such as rapeseed meal.

  Moreover, in the operation method of the granular material storage tank device 2 according to this embodiment, the injection of the granular material from the charging port 6 into the silo 4 is temporarily stopped, and the spiral raking blade 12 rotates in the reverse direction. The case where the hydraulic motor 26 is driven for 1 minute so as to perform the above has been described as an example, but the time for driving the hydraulic motor 26 to rotate the spiral raking blade 12 in the reverse rotation direction is not limited to 1 minute. However, in the case of less than 15 seconds, there is a possibility that the powder particles in the vicinity of the spiral raking blade 12 are not sufficiently crushed. Moreover, when it exceeds 2 minutes, there exists a possibility that the granular material conveyed by the rotation motion of the reverse direction of the spiral raking blade | wing 12 may be pressed on the wall surface of the silo 4, and may solidify. Therefore, the time for driving the hydraulic motor 26 to rotate the spiral scraping blade 12 in the reverse direction is preferably in the range of 15 seconds to 2 minutes.

  Moreover, in the operation method of the granular material storage tank device 2 according to this embodiment, the introduction of the granular material to the silo 4 is temporarily stopped, and the spiral raking blade 12 is rotated in the reverse direction for a predetermined time, and thereafter The case where the granular material is charged up to the target height has been described as an example. However, the spiral scraping blade 12 is rotated in the reverse direction from the start of charging of the granular material into the silo 4 and is charged into the silo 4. When the spiral scraping blades 12 are buried by the powder particles, the rotational motion of the spiral scraping blades 12 may be stopped, and the powder particles may be continuously charged to the target height.

  Alternatively, the spiral scraping blade 12 is rotated in the reverse direction from the start of charging of the granular material into the silo 4, and when the spiral scraping blade 12 is buried by the granular material, the granular material is temporarily charged into the silo 4. And the rotation of the spiral raking blade 12 is continued until a predetermined time elapses from the temporary stop of the charging of the granular material. After the predetermined time elapses, the rotation of the spiral raking blade 12 is stopped, and the inside of the silo 4 It is also possible to restart the charging of the granular material to the target height and perform the charging of the granular material to the target height.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. A Laidig Cone-Bottom Reclaim System was installed at the bottom of the cylindrical silo as a discharge device. The inner diameter of the cylindrical silo is 7.6 m, and the effective height is 30.4 m. A defatted soybean powder (volume average diameter 1.4 mm) was used as the powder. Non-fat soy flour is obtained by grinding soybean oil from soybeans and is used as a raw material for miso and soy sauce as well as feed and fertilizer. Yes.

Example 1
When 920 tons of defatted soybean powder is put into an empty cylindrical silo, the introduction of the defatted soybean powder is temporarily stopped during the introduction (when 12 t is added as the weight), so that the spiral raking blade 12 rotates in the reverse direction. The discharge device 8 was operated for 1 minute. Thereafter, the introduction of the defatted soybean powder was resumed, and after the completion of the introduction of the 920 t of the defatted soybean powder, the mixture was left to stand for 9 days. Thereafter, the slide gate 18 was opened and the discharge device 8 was activated to try to discharge the defatted soybean powder. The results are shown in FIG.

  At the start of discharging the defatted soybean powder, the spiral scraping blade 12 is difficult to rotate because the powder particles in the cylindrical silo are consolidated. Therefore, when the spiral scraping blade 12 does not rotate normally and the hydraulic pressure of the hydraulic motor 26 rises to about 3000 [psi], the hydraulic motor 26 automatically stops and restarts, that is, the spiral scraping blade 12 Execute jog operation that repeats inching and stopping. By repeating this jog operation, the defatted soybean powder around the spiral scraped blade 12 is crushed. Then, by repeating the jog operation, the spiral scraping blade 12 starts to rotate normally, and the discharge of the defatted soybean powder is started.

  FIG. 2 shows the relationship between the hydraulic pressure applied to the hydraulic motor 26 by the rotation motion and the hydraulic pressure applied to the hydraulic motor by the revolution motion and the elapsed time from the start of the discharge operation in the first embodiment. In Example 1, as shown in FIG. 2, after performing jog operation 64 times, the spiral raking blade 12 rotated normally and the defatted soybean flour could be discharged.

(Comparative Example 1)
After 920 t of defatted soybean powder as a weight was put into an empty cylindrical silo, it was left to stand for 9 days, and the discharge device 8 was started to perform a discharge operation. The results are shown in FIG. Note that the discharge device 8 was not operated during the introduction of the defatted soybean powder into the cylindrical silo.

  FIG. 3 shows the relationship between the hydraulic pressure applied to the hydraulic motor 26 by the rotation motion and the hydraulic pressure applied to the hydraulic motor by the revolution motion and the elapsed time from the start of the discharge operation in Comparative Example 1. In Comparative Example 1, as shown in FIG. 3, after performing 138 jog operations, the spiral raking blade 12 rotated normally and the defatted soybean flour could be discharged.

(Comparative Example 2)
On a different day from Comparative Example 1, 920 t of defatted soybean powder was put into an empty cylindrical silo and then left to stand for 9 days. Then, the discharge device 8 was started and a discharge operation was attempted. The results are shown in FIG. Note that the discharge device 8 was not operated during the introduction of the defatted soybean powder into the cylindrical silo.

  FIG. 4 shows the relationship between the hydraulic pressure applied to the hydraulic motor 26 due to the rotation motion and the hydraulic pressure applied to the hydraulic motor due to the revolution motion in Comparative Example 2 and the elapsed time from the start of the discharge operation. In Comparative Example 2, after performing 112 jog operations as shown in FIG. 4, the spiral raking blade 12 rotated normally and the defatted soybean flour could be discharged.

  2 ... powder storage device, 4 ... silo, 6 ... inlet, 8 ... discharge device, 12 ... spiral scraping blade.

Claims (4)

A storage tank section for storing powder particles;
A charging mechanism for charging the granular material from the upper part of the storage tank;
The storage tank unit has a spiral scraping blade, and includes a discharge mechanism that discharges the granular material from the lower portion of the storage tank unit by the rotation of the spiral scraping blade,
An operation method of a granular material storage tank device that performs a jog operation in which the spiral movement of the spiral scraping blade by the discharge mechanism is repeatedly jogged and stopped when the discharge of the granular material in the storage tank by the discharge mechanism is started. And
During introduction into the that by the shooting mechanism performed when by the discharge mechanism is not performed discharging operation of the powder or granular material in said reservoir unit the powder or granular material of the reservoir unit, temporarily insertion of the powder or granular material After stopping the discharge mechanism and operating the discharge mechanism for a predetermined time so that the spiral scraping blade rotates in the direction opposite to the discharge direction of the powder. And operating the granular material storage tank device, wherein the granular material is charged to a target height.   The said predetermined time is 15 second-2 minutes, The operating method of the granular material storage tank apparatus of Claim 1 characterized by the above-mentioned.   The charging mechanism temporarily stops the charging of the granular material when the amount of the granular material charged into the storage tank portion becomes 1 to 10% with respect to the maximum amount that can be charged into the storage tank portion. The operation method of the granular material storage tank apparatus of Claim 1 or 2 characterized by the above-mentioned. A storage tank section for storing powder particles;
A charging mechanism for charging the granular material from the upper part of the storage tank;
The storage tank unit has a spiral scraping blade, and includes a discharge mechanism that discharges the granular material from the lower portion of the storage tank unit by the rotation of the spiral scraping blade,
An operation method of a granular material storage tank device that performs a jog operation in which the spiral movement of the spiral scraping blade by the discharge mechanism is repeatedly jogged and stopped when the discharge of the granular material in the storage tank by the discharge mechanism is started. And
When charging the granular material up to the target height in the storage tank by the input mechanism when the discharge operation of the granular material in the storage tank by the discharge mechanism is not performed ,
The spiral scraping blade rotates in the direction opposite to the discharging direction of the granular material until the spiral scraping blade is buried by the granular material thrown into the storage tank section after starting the charging of the granular material. The operating method of the granular material storage tank device characterized by operating the discharge mechanism as described above.

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