JP2009255000A - Apparatus for supplying staple fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably and quantitatively supply a staple fibrous material containing water. <P>SOLUTION: An apparatus for supplying staple fiber includes a hopper 10 to which a staple fibrous material containing water is fed, a screw feeder part 28 composed of a screw 26 installed in a rotary shaft 18 set in a freely rotating manner in the inside of the hopper 10, and paddles 30 and 32 attached to the rotary shaft 18 in the screw feeder part 28 or its periphery, and the paddles 30 and 32 are bent or curved at an angle of 10 to 100° toward the rotation direction of the paddles 30 and 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a short fiber supply device that quantitatively supplies a short fibrous substance containing moisture, and more specifically, for example, a short fibrous sludge dehydration aid containing moisture used for dewatering sludge. The present invention relates to a short fiber supply device used for continuously supplying water continuously to a sludge water storage tank or a coagulation tank.

  The applicant applies, for example, a sludge generated from a sewage treatment facility or a human waste treatment facility to a sludge dehydration aid comprising a short fiber viscose rayon having a moisture content of 30 to 80% by weight and a length of 1 to 20 mm. It has been proposed to stably perform sludge dewatering treatment by adding (see Patent Document 1). In this case, it is desirable to continuously supply a predetermined amount of short-fiber sludge dewatering aid (short fiber-like material) containing moisture quantitatively to a sludge treatment tank or the like.

  As a means for supplying or weighing short fibers, a belt conveyor, a vibration conveyor, a screw conveyor, or the like is generally known. Moreover, as a fixed quantity supply apparatus of a short fiber thing, what comprised the hopper which accommodates a short fiber thing, and the screw conveyor provided in the lower end part of this hopper is used widely. However, when trying to quantitatively supply the short fibrous materials with these supply devices, the short fibrous materials tend to be entangled with each other, so that the supply amount tends to vary. Not practical when supply is low.

  On the other hand, in the so-called hopper type quantitative supply device in which short fiber-like materials are stored in the hopper and the internal short fiber-like portions are quantitatively taken out from the discharge port at the bottom of the hopper, the short fiber containing moisture in particular When trying to supply the material quantitatively, the so-called bridging phenomenon of the short fiber material (a phenomenon in which the short fiber material becomes an integral lump and becomes difficult to collapse) occurs, and the internal shortage of the hopper occurs. The matter may not be discharged smoothly. Then, once a bridge is generated inside the hopper, the timing at which the bridge collapses is not a constant interval, so that it becomes difficult to carry out and supply the short fibrous material quantitatively continuously from the hopper.

  In order to prevent internal clogging due to the occurrence of the bridging phenomenon in the hopper, a vibration device such as a vibrator or a hammering device such as an air hammer is attached to the side surface of the hopper to give vibration to the hopper, or the raw material is stirred in the hopper It is known to carry out a short fibrous substance from a hopper while installing a stirrer that stirs the raw material.

  However, even if vibration is applied to the hopper, the vibration is not sufficiently transmitted to the short fibrous material located at a position away from the outer plate of the hopper, and not only is the effect of breaking the bridge thin, but if the vibration force is increased, the hopper It also has a problem that leads to the destruction of In addition, when a bridge is generated, the vibration applied to the hopper increases the density of the short fibrous material forming the bridge, and the bridge itself becomes stronger, so that the exit portion of the hopper (of the screw conveyor) There is a risk of causing a further blockage at the inlet portion. For this reason, when operating the above-described quantitative supply device, it is necessary to constantly monitor the hopper and operate the vibration device and the striking device when a bridge starts to form inside. In addition, the short fibers may be concentrated by vibration, which may rather promote the bridge. Furthermore, when a striking device is attached, there is a problem that the hopper may be damaged and the noise is intense.

  When a stirrer is installed inside the hopper, there is a certain effect in preventing the bridging phenomenon, but when supplying short fibrous material that absorbs water, the short fibrous material adheres to the surface of the stirring blade. There is a problem that short fibers are clogged in the vicinity of the discharge portion having a small opening area, and the discharge of the short fibers is hindered.

  Here, an agitator in which a rod-shaped material is spirally formed in the vicinity of the discharge port in the hopper, and a fiber raw material feeder device (see Patent Document 2) in which the agitator is set so that the agitator moves upwardly, A spiral powder scraper is provided along the inner wall surface of the hopper, the inner wall surface of which is formed in a funnel shape, and the bottom portion is provided with a powder discharge port communicating with the cylindrical discharge portion. There has been proposed a powder supply device (see Patent Document 3) in which powder is discharged by screw grooves of cylindrical discharge portions at the top and bottom.

  Further, a hopper stirrer (see Patent Document 4) provided with a stirring rod arranged in a conical spiral around the shaft suspended so as to be coaxial with the hopper, A silo body having a powdery material opening at the top and a flat bottom with a discharge opening, a conveyor provided below the discharge opening of the silo body, and a top wall or a bottom wall in the silo body There has been proposed a silo device (see Patent Document 5) that is composed of a spiral body that is pivotally supported at least on one side and that flies upward from below, and a rotational drive means for the spiral body.

  Also, a powder filling apparatus comprising a funnel having a hopper at the upper end and an auger screw having an enlarged screw portion at the lower end, and a predetermined interval between the inner peripheral surface of the hopper and the enlarged screw. Has been proposed (see Patent Document 6).

  Furthermore, a powder raw material measuring tank including a hopper provided with a discharge port for discharging the powder raw material at the lower end and an agitator for stirring the powder raw material in the hopper has been proposed (see Patent Document 7). The agitator includes a rotating shaft extending to a discharge port disposed on the hopper center axis, at least two beam members extending radially outward from the rotating shaft toward the inner peripheral wall of the hopper, and rotating shafts held by the respective beam members. And a stirring blade rotating along the inner peripheral wall of the hopper, and a screw disposed through the discharge port so as to discharge the powder raw material from the discharge port.

JP 2007-283225 A Japanese Utility Model Publication No.3-110095 JP 7-1333029 A JP-A-9-216688 Japanese Patent Laid-Open No. 10-167481 JP 2002-19729 A JP 2005-132427 A

  However, in the feeder device for fiber raw materials described in Patent Document 2, the short fiber can be transferred only in the outlet direction of the hopper with the spirally formed agitator, and therefore the short fiber can be quantitatively cut out. In addition, it is considered that the conical portion occupies most of the hopper volume, and the amount of hopper stored is significantly reduced.

  The powder supply apparatus described in Patent Document 3 is considered to have the following problems when a short fiber-like part containing moisture is used as a raw material.

  That is, since the short fiber-like material (raw material) cannot be fluidized in the hopper straight body part, the short fiber part bridges in the hopper straight body part or becomes hollow, and the short fiber part is in the lower part. It does not move to the funnel-shaped portion of the hopper, and as a result, the short fiber cannot be supplied from the hopper. In addition, the spiral powder scraper provided along the inner wall surface of the hopper cannot supply the short fiber to the cylindrical discharge part at the bottom of the hopper, and the short fiber part is spiral in the funnel-like part. Co-rotates with the upper part of the powder. Further, if the interval between the spiral powder scrapers is narrow, the short fiber portion is sandwiched between the spiral powder scrapers, and the short fiber portion is only rotated with the rotation of the spiral powder scraper. The short fiber part cannot be moved to the powder outlet. Even if the short fiber can move to the lower part, a new short fiber part is not replenished from the upper part, and cavitation occurs in the gap part of the upper part of the spiral powder scrap. Conversely, if the interval between the spiral powder scrapers is wide, the short fiber portion will not be sandwiched between the gaps, but even if the spiral powder scraper rotates, the short fiber portion does not stay on the spot. Stirring and short fibers become entangled to form a large lump-like lump.

  The stirrer provided in the hopper stirrer described in Patent Document 4 is the same as mere paddle stirrer. When stirring with the stirrer bar, the short fiber portion is stirred only in the horizontal direction, and a short part is placed below each stirrer. If the fibrous material does not move, and therefore not only can the short fiber material not be transferred to the hopper opening at the bottom of the hopper, but the short fiber in the straight body portion of the hopper is short fiber It is considered that a bridging phenomenon occurs in the object, and the short fiber cannot move to the conical part in the lower part of the straight body, and therefore the short fiber cannot be cut out from the hopper opening.

  The silo device described in Patent Document 5 is considered to have the following problems when the stored product is a short fibrous material containing moisture.

  That is, in a spiral body with a small diameter at the top of the silo and a diameter increasing toward the bottom of the silo, short fibers (stored materials) cannot be lifted from the bottom to the top of the silo, and short fibers The shape becomes a pledget, the short fiber is simply rotated around the spiral, and the short fiber does not move toward the lower part of the silo. Ribbon-like spirals cannot transfer the short fibers in the silo to the top or bottom. In addition, when trying to discharge a short fiber (stored material) to the discharge opening at the bottom of the silo by a paddle blade curved at the bottom of the spiral disk located at the bottom of the silo, the short fiber is bent by the spiral. Even if it is transferred to the paddle blade, the space between the curved paddle blades extending radially from the rotating shaft is blocked by the short fibrous material, and the short fibrous material cannot be discharged from the discharge opening at the bottom of the silo.

  In the powder fluid filling device of the device of Patent Document 6, the powder particles enter the gap between the diameter expansion screw and the inner peripheral surface of the hopper and allow the powder particles to enter the groove in the diameter expansion screw portion. The diameter screw moves the granular material to the auger screw provided in the lower part thereof. Although there is no mechanism for forcibly feeding the granular material to the diameter-expanding screw part, the granular material can enter the gap allowing the intrusion of the granular material due to its fluidity and its own weight. However, the short fibrous material does not have fluidity like a granular material, and cannot naturally enter the gap that allows the granular material to enter. In addition, a scraping blade is installed on the upper part of the diameter expansion screw, and an agitator lot is attached to the scraping blade. When these are operated in a short fibrous material, the short fibrous material becomes a pledget-like lump. Become. Therefore, it is considered that the short fibrous material cannot be discharged from the discharge port at the lower end of the hopper.

  The powder raw material measuring tank described in Patent Document 7 is considered to have the following problems when a short fiber portion containing moisture is used as a raw material.

  That is, when the beam member and the stirring blade that synchronize with the rotating shaft are rotated in a state where the short fiber is filled in the hopper, the short fiber is entangled with the beam member, and the stirring blade and the hopper rotate along the inner peripheral wall of the hopper. Excessive load is applied to the rotating shaft by being caught in the gap with the inner peripheral wall. In addition, the horizontally-arranged beam members are in the way, and the short fibers cannot move downward. In particular, the beam member close to the discharge port is tangled with a short fibrous material or blocked by the short fibrous material because the member is short. If the short fibers are entangled or blocked with the member, the screw is idle and the short fiber-like material cannot be carried out to the discharge port. Even if the downward movement of the short fiber-like material is improved by the structure in which only one of the horizontally arranged beam members extends radially outward, most of the short fiber members are beam members. Will stay in the range of rotation. Further, the non-flowable short fiber member filled above the uppermost beam member cannot be moved downward. Furthermore, if the short fibrous material is stirred with a stirring blade rotating along the inner peripheral wall of the hopper, the short fibrous material grows into a pledget-like lump, the size of which exceeds the discharge port diameter, and cannot be transferred with a screw. It cannot be discharged.

  As described above, using a conventional quantitative supply apparatus, a short fibrous material containing moisture, for example, sludge composed of short fibrous viscose rayon having a moisture content of 30 to 80% by weight and a length of 1 to 20 mm. When trying to continuously supply the dehydration aid quantitatively, the short fibrous material is not fluid because it contains moisture and does not move downward due to its own weight. It grows into a pledget-like lump and its size exceeds the discharge port diameter, and cannot be transferred or discharged by a screw.

  This invention is made | formed in view of the said situation, and it aims at providing the short fiber supply apparatus which enabled it to supply the short fiber-like thing containing a water | moisture content quantitatively continuously.

  The invention according to claim 1 is a hopper for introducing a short fibrous material containing moisture therein, a screw feeder portion provided with a screw on a rotating shaft rotatably disposed inside the hopper, and the screw feeder. It is provided with paddle blades attached to the rotary shaft located in or near the section, and the paddle blades are bent or curved at an angle of 10 to 100 degrees in the rotation direction of the paddle blades. This is a short fiber feeder.

  As a result, the short fibrous material containing moisture introduced into the hopper is scraped to the center of the hopper along with the rotation of the paddle blades and is transported to the vicinity of the screw feeder portion. Along with this, the hopper is discharged quantitatively and sequentially. The paddle blade is bent or curved at an angle of 10 to 100 ° toward the rotational direction of the paddle blade, and this angle is preferably 30 to 90 °. As a result, the paddle blade effectively scrapes the short fibrous material in the hopper while preventing the paddle blade from twisting in the direction opposite to the rotational direction without enduring the resistance caused by the short fibrous material entangled during the rotation. A sufficient amount of short fibrous material to be discharged quantitatively can be supplied to the screw feeder.

  In the invention according to claim 2, the ratio of the total length l of the paddle blades to the distance a from the base end of the paddle blades to the center of the curved portion: a / l is 0.1 to 0.8. The short fiber supply apparatus according to claim 1, wherein the apparatus is a short fiber supply apparatus.

  Ratio of the total length l of the paddle blade and the distance a from the center of the paddle blade to the free end: When a / l is smaller than 0.1, the ratio of the paddle blade to the vicinity of the screw feeder portion with respect to the short fibrous material The scraping effect is not sufficient, and the quantitative supply becomes difficult. On the other hand, when the ratio: a / l exceeds 0.8, the paddle blade may not withstand the resistance caused by the short fibrous material entangled with the paddle blade during its rotation, and may twist in the direction opposite to the rotation direction. .

The invention according to claim 3 is characterized in that a plurality of the paddle blades are provided at positions spaced apart by a predetermined distance along the length direction of the rotating shaft. It is a supply device.
The number of installed paddle blades may be one or plural. Further, the installation position can be arbitrarily set within the vicinity of the screw feeder or in the vicinity thereof.

  You may attach an obstruction | occlusion prevention part to a rotating shaft so that it may extend to the diameter direction outer side of this rotating shaft. In this way, by attaching the blockage prevention part and stirring the short fibrous material in the hopper with the blockage prevention part, the so-called bridging phenomenon occurs in the hopper, in which the short fiber objects are entangled with each other and do not flow. It can prevent, smooth discharge of the short fibrous material, and can greatly contribute to the quantitative supply of the short fibrous material. The installation position of the blocking prevention part is preferably on the upstream side of the paddle blade.

  The invention according to claim 4 is characterized in that the hopper has a conical portion connected to the hopper discharge port, and the screw feeder portion is located in the conical portion. It is the short fiber supply apparatus in any one.

  The invention according to claim 5 is the short fiber supply device according to claim 4, wherein a difference between an inner diameter of the hopper discharge port and an outer diameter of the screw feeder is 10 to 100 mm.

  If the difference between the inner diameter of the hopper discharge port and the outer diameter of the screw feeder portion is smaller than 10 mm, it is not preferable because it becomes difficult to discharge the short fibrous material from the hopper discharge port, and if this difference exceeds 100 mm, The accuracy of the supply amount will decrease. This difference is preferably 20 to 40 mm.

The invention according to claim 6 is characterized in that the short fibrous material is a dewatering aid for sludge having a water content of 20 to 70% by weight and a length of 1 to 50 mm. A short fiber supply device according to claim 1.
The shape of the short fiber is not particularly limited, but if it is a dewatering aid for sludge having a water content of 20 to 70% by weight and a fiber length of 1 to 50 mm, it can be reliably supplied in a quantitative manner by the apparatus of the present invention. .

  According to the short fiber supply device of the present invention, a dewatering aid for sludge comprising a short fibrous material containing moisture, for example, a short fibrous viscose rayon having a moisture content of 20 to 70% by weight and a length of 1 to 50 mm. Can be quantitatively continuously supplied to a sludge storage tank or the like. In addition, with a relatively simple configuration, even if a short fibrous material adheres to the inner peripheral surface or the like of the hopper, the cleaning can be easily performed, so that the running cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or corresponding members are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a longitudinal front view of a short fiber supply device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 1 and 2, the short fiber supply device includes a hopper 10 having a cylindrical portion 10a extending vertically and a conical portion 10b integrally connected to the lower end of the cylindrical portion 10a. It has. The upper end opening of the cylindrical portion 10a of the hopper 10 is closed by a ceiling plate 12 having an insertion port for introducing the short fibrous material A containing moisture into the ceiling plate 12, and the ceiling plate 12 opens and closes the insertion port. A lid 14 is attached. An opening serving as a hopper discharge port 16 is provided at the lower end of the conical portion 10 b of the hopper 10. The height and the inner diameter of the cylindrical portion 10a of the hopper 10 are not particularly limited, but usually the height is about 200 to 1000 mm and the inner diameter is about 100 to 2000 mm.

  Although the short fibrous material A containing the water | moisture content thrown into the inside of the hopper 10 from an inlet is not specifically limited, For example, a moisture content is 30 to 80 weight%, 1 to 20 mm in length, or a moisture content is 20 to 70 weight. It is a dewatering aid for sludge composed of short fiber viscose rayon having a length of 1 to 500 mm. As described above, when the sludge dewatering aid is used as the short fibrous material A containing moisture, the hopper 10 is disposed, for example, above the sewage storage tank, and the sludge dewatering aid is transferred from the hopper 10 to the sewage treatment tank. Quantitatively supplied within.

  Inside the hopper 10, a rotary shaft 18 that is located at the center of the hopper 10 and extends up and down over almost the entire length of the hopper 10 is arranged. The upper end of the rotary shaft 18 is arranged at the center of the ceiling plate 12. It is connected to the output shaft of the motor 20. The rotation speed of the motor 20 is controlled by, for example, a control panel (not shown) attached to the outer peripheral surface of the cylindrical portion 10 a of the hopper 10.

  Located at the inside of the cylindrical portion 10a of the hopper 10, the rotation shaft 18 is connected to the base end of a rod-shaped blockage prevention member 22 that extends linearly outward in the diameter direction of the rotation shaft 18, and prevents this blockage. The free end of the member 22 is close to the inner peripheral surface of the cylindrical portion 10 a of the hopper 10. In this way, by attaching the blocking prevention member 22 and stirring the short fibrous material A in the hopper 10, the so-called bridging phenomenon is prevented in which the short fibrous materials A are entangled and do not flow in the hopper 10. In addition, the discharge of the short fibrous material A can be smoothly performed, and it can greatly contribute to the quantitative supply of the short fibrous material A. The installation position of the blocking prevention member 22 is preferably upstream of the following paddle blades 30 and 32. In this example, the blockage prevention member 24 is configured by the blockage prevention member 22.

  Further, a screw 26 is provided on the rotary shaft 18 at a position covering almost the entire height of the conical portion 10 b of the hopper 10, and the short fiber A is quantitatively transferred to the hopper by the rotary shaft 18 and the screw 26. A screw feeder portion 28 that discharges from the discharge port 16 is configured. As the screw type, any of a biaxial co-rotating screw, a fully meshed single screw, and a short shaft screw can be used.

  The first paddle blade 30 is disposed at a position immediately above the screw feeder portion 28, and the second paddle blade 32 is disposed at a substantially intermediate position along the length direction of the screw feeder portion 28 with the base end thereof connected to the rotary shaft 18. Has been. The base end side 30a of the first paddle blade 30 extends in a direction orthogonal to the rotation shaft 18, and the free end side 30b is oriented toward the rotation direction of the first paddle blade 30 indicated by an arrow in FIG. It is bent at an angle θ with respect to the extended line on the end side 30a. Similarly, the second paddle blade 32 also has a base end portion 32a extending in a direction orthogonal to the rotation shaft 18, and a free end portion 32b facing the rotation direction of the second paddle blade 32 indicated by an arrow in FIG. Thus, it is bent at an angle θ with respect to the extended line on the base end side 32a. This angle θ is 90 ° in this example.

  As the first paddle blade 30 and the second paddle blade 32 rotate, the short fibrous material A containing moisture introduced into the hopper 10 is collected in the central portion of the hopper 10 and in the vicinity of the screw feeder portion 28. In addition, the short fiber material A is brought into contact with the short fiber material A containing moisture in the hopper 10 to loosen the short fiber material A so as to be easily dropped. The paddle blades 30 and 32 may be in the shape of a round bar, but by using a plate-like body, the short fiber A in the hopper 10 can be constantly lifted and stirred and supplied stably. .

  In the first paddle blade 30, the angle θ formed by the extended line on the base end side 30 a and the free end side 30 b is 10 to 100 °, and preferably 30 to 90 °. If this angle θ is smaller than 10 °, the effect of scraping the short fiber portion A to the vicinity of the screw feeder portion 28 is not sufficient, and not only the quantitative supply becomes difficult, but also the first paddle blade 30 is rotated during its rotation. If the angle θ is larger than 100 °, the short fiber-like material that is scraped to the vicinity of the screw feeder portion 28 may be twisted in the direction opposite to the rotational direction without enduring resistance due to the tangled short fiber-like material A. It has been confirmed that the amount of the product A is reduced, and it becomes impossible to supply quantitatively or not at all. The same applies to the second paddle blade 32.

  In this example, the first paddle blade 30 is connected to the base end portion 30a and the free end portion 30b so as to be bent at right angles to each other. The proximal end side 30a and the free end side 30b may be connected so as to be gradually connected to each other in a tangential manner, or the free end side 30b may be curved in an arc shape. good. The same applies to the second paddle blade 32.

  Further, the total length l (l = a + b) of the first paddle blade 30 which is the sum of the distance a of the base end side 30 a of the first paddle blade 30 and the distance b of the free end side 30 b and the base of the first paddle blade 30. The distance a and the ratio a / l of the end side 30a are preferably 0.1 to 0.8, and more preferably 0.2 to 0.8. If this ratio: a / l is smaller than 0.1, the effect of scraping the first paddle blade 30 to the vicinity of the screw feeder portion 28 with respect to the short fibrous material A is not sufficient, and the quantitative supply becomes difficult. When this ratio: a / l exceeds 0.8, the first paddle blade 30 is entangled with the short fibrous material A when the first paddle blade 30 is rotated, and the first paddle blade 30 is resisted by the resistance due to the short fibrous material A. It has been ascertained that it may be twisted in the direction opposite to the rotational direction without enduring it.

  Further, the difference (D−d) between the inner diameter D of the hopper discharge port 16 and the outer diameter d of the screw feeder portion 28 is preferably 10 to 100 mm. If the difference between the inner diameter D of the hopper discharge port 16 and the outer diameter d of the screw feeder portion 28 is smaller than 10 mm, it is not preferable because it becomes difficult to discharge the short fibrous material A from the hopper discharge port 16. If it exceeds 100 mm, the accuracy of quantitative supply will decrease. This difference is preferably 20 to 40 mm.

  In this example, the first paddle blade 30 having a long overall length is used. For this reason, the reinforcing member 34 extending obliquely between the base end portion and the free end of the first paddle blade 30 is used. Are attached to reinforce the first paddle blade 30. As the reinforcing member 34, for example, a pipe having a width or an outer diameter smaller than the width of the first paddle blade 30 in the height direction can be used. Such reinforcement is performed as necessary.

Next, an operation example of the short fiber supply device of this embodiment will be described.
First, the lid 14 is opened, and the short fibrous material A containing moisture is introduced into the hopper 10 from the inlet. The input amount of the short fibrous material A is, for example, about 80% of the volume of the hopper 10. Then, the motor 20 is driven to rotate the rotary shaft 18. Then, the blocking prevention member 22 (blocking prevention part 24) rotates, and this rotation prevents the short fiber A from bridging at the position where the blocking prevention member 22 is disposed or in the vicinity thereof. The

  At the same time, the screw feeder portion 28, the first paddle blade 30 and the second paddle blade 32 rotate, and the short fibrous material located in the vicinity of the screw feeder portion 28 in the hopper 10 as the screw feeder portion 28 rotates. A short fiber located at a position away from the screw feeder portion 28 in the hopper 10 with the phenomenon that A is discharged in a fixed amount and a cavity is formed here, and the first paddle blade 30 and the second paddle blade 32 rotate. A phenomenon occurs in which the article A is collected in the center of the hopper 10 and carried to the vicinity of the screw feeder portion 28. As a result, the short fibrous material A is continuously replenished in the vicinity of the screw feeder portion 28, and the short fibrous material A containing water is quantitatively continuously discharged (supplied) from the hopper 10. The amount of short fiber A supplied is controlled by adjusting the rotational speed of the motor 20.

  As shown in FIG. 3, the screw conveyor 42 is communicated with the hopper discharge port 16 via a coupling 44, whereby the short fibrous material A containing moisture is continuously supplied from the hopper 10 to the screw conveyor 42. You may do it.

  FIG. 4 shows a short fiber supply device according to another embodiment of the present invention. The difference from this example shown in FIGS. 1 and 2 is that the first paddle blade 30 in the example shown in FIGS. 1 and 2 is omitted. Thus, the number of paddle blades installed may be one or plural. Further, the installation position can be arbitrarily set within the screw feeder 28 or in the vicinity thereof.

  FIG. 5 shows a short fiber feeder according to still another embodiment of the present invention. 1 and FIG. 2 of this example is different from the example shown in FIGS. 1 and 2 in that two rod-like blocking prevention members 22a and 22b are arranged with a predetermined interval in the vertical direction and the base end connected to the rotating shaft 18, and these The obstruction prevention members 22a and 22b are connected to each other by a connecting rod 50 to constitute an obstruction prevention part 24a. In this example, by giving the width to the blocking prevention part 24a, the short fiber A in the hopper 10 is stirred with the rotation of the blocking prevention part 24a and the short fiber A in the hopper 10 is stirred. It is possible to expand the area for preventing the bridging phenomenon.

  FIG. 6 shows a short fiber feeder according to still another embodiment of the present invention. The difference from the example shown in FIGS. 1 and 2 of this example is that a plate-like stirring part 52 is provided on the outer peripheral part of the blocking prevention member 22 to constitute the blocking prevention part 24b.

  FIG. 7 shows a short fiber feeder according to still another embodiment of the present invention. The difference from the example shown in FIGS. 1 and 2 in this example is that an expansion stirrer 54 is suspended from the peripheral edge of the blockage prevention member 22 to form a blockage prevention unit 24c.

  FIG. 8 shows a short fiber feeder according to still another embodiment of the present invention. The difference from the example shown in FIG. 7 in this example is that the third paddle blade 56 is provided in the screw conveyor portion 28, located below the second paddle blade 32.

  Next, the present invention will be described in more detail with specific examples.

Example 1
In the short fiber supply device shown in FIG. 1 and FIG. 2, inside a hopper 10 having a cylindrical portion 10a having an inner diameter of 800 mm and a height of 500 mm and a conical portion 10b having a height of 300 mm and an inner diameter of the hopper discharge port 16a of 60 mm. In addition, a short fiber supply device provided with a screw feeder portion 26 having a screw diameter of 30 mm, a screw length of 800 mm, and a pitch width of 30 mm was used. Then, a blocking prevention member 22 was attached at a point 200 mm below the upper end of the hopper 10. Moreover, the 1st paddle blade | wing 30 was attached to the point of 50 mm below from the upper end of the cone-shaped part 10b. As the first paddle blade 30, a plate body having a length of 150 mm and a width of 20 mm and having a shape bent at 90 ° from the position 30 mm from the joint with the rotary shaft 18 toward the rotation direction was used.

A cellulose fiber supply test was performed using the short fiber supply apparatus having the above-described configuration. Cellulose fibers used in the supply test are as follows. Short fibers are mixed and easily entangled, and the phase by the screw feeder is extremely difficult compared with a general fluid. In addition, the rotation speed of the screw conveyor part 26 was 5 rpm and 10 rpm.
Fiber length: 3mm or 10mm
Moisture content: 55%
Specific gravity: 1.5

(Example 2)
In Example 1, a supply test was performed in the same manner as in Example 1 except that the bending angle of the first paddle blade 30 was set to 30 °.

(Example 3)
In Example 1, the supply test was performed by providing the second paddle blade 32 at a position 100 mm below the first paddle blade 30. As the second paddle blade 32, a plate body having a length of 100 mm and a width of 15 mm and having a shape bent at 90 ° in the rotation direction from a position 50 mm from the joint point with the screw was used.

Example 4
In Example 3, a supply test was performed in the same manner as in Example 3 except that the blocking prevention member 22 was removed.

(Example 5)
In Example 3, the first paddle blade 30 and the second paddle blade 32 were replaced with the shapes shown in Table 1, and the supply test was performed in the same manner as in Example 3 except that. Moreover, the blockage prevention part 24a which has the blockage prevention members 22a and 22b of the rod-shaped thing 15mm in diameter and 100mm in length shown in FIG.

(Example 6)
In Example 5, the first paddle blade 30 and the second paddle blade 32 were replaced with the shapes shown in Table 1, and the supply test was performed in the same manner as in Example 5 except that.

(Example 7)
In the fifth embodiment, the first paddle blade 30 and the second paddle blade 32 are replaced with the shapes shown in Table 1, and the position of the first paddle blade 30 is changed to a point of 100 mm downward from the upper end of the conical portion 10b. Otherwise, the supply test was conducted in the same manner as in Example 5.

(Comparative Example 1)
In the apparatus used in Example 1, the supply test was performed by changing the bending angle of the first paddle blade 30 to 150 °.

(Comparative Example 2)
In the apparatus used in Example 3, a supply test was performed using the first paddle blade 30 and the second paddle blade 32 shown in Table 1.

(Comparative Example 3)
The first paddle blade 30 was removed from the apparatus used in Example 1, and a supply test was performed. As a result of this test, it was found that the supply could not be made, so the apparatus was stopped when 3 minutes had elapsed since the start.

(Comparative Example 4)
In the apparatus used in Example 3, a supply test was performed using a hopper in which the difference between the inner diameter d of the hopper discharge port 16 and the outer diameter D of the screw feeder portion 28 was 6 mm. As a result of this test, the torque was exceeded, and the apparatus was stopped when 3 minutes had elapsed after starting.

  Table 1 shows the supply amount for a fixed time at specific rotation speeds of Examples 1 to 7 and Comparative Examples 1 and 2.

  As shown in Table 1, in Examples 1 to 7, it is found that a supply amount that is almost constant is always obtained, and that the supply amount is stable over time. Further, the rotational speed and the supply amount were in a proportional relationship and the reproducibility was good. On the other hand, in Comparative Examples 1 and 2, the discharge amount fluctuated greatly, and stable quantitative supply could not be performed. In particular, in Comparative Example 1, since it was found that the product could not be supplied, the apparatus was stopped when 10 minutes had elapsed since the start. In Comparative Example 2, it was necessary to stop the apparatus after 5 minutes and to manually break the bridge formed on the screw feeder.

It is a vertical front view which shows the short fiber supply apparatus of embodiment of this invention. It is AA sectional drawing of FIG. It is a longitudinal front view which shows the state which connected the short fiber supply apparatus shown in FIG.1 and FIG.2 to the screw conveyor. It is a vertical front view which shows the short fiber supply apparatus of other embodiment of this invention. It is a vertical front view which shows the short fiber supply apparatus of further another embodiment of this invention. It is a vertical front view which shows the short fiber supply apparatus of further another embodiment of this invention. It is a vertical front view which shows the short fiber supply apparatus of further another embodiment of this invention. It is a vertical front view which shows the short fiber supply apparatus of further another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hopper 10a Cylindrical part 10b Conical part 14 Cover body 16 Hopper discharge port 18 Rotating shaft 20 Motor 22, 22a, 22b Blocking prevention member 24, 24a, 24b, 24c Blocking prevention part 26 Screw 28 Screw feeder parts 30, 32, 56 Paddle blade 42 Screw conveyor 44 Coupling

Claims (6)

A hopper that puts short fiber containing water into the interior;
A screw feeder portion provided with a screw on a rotary shaft rotatably disposed inside the hopper;
A paddle blade attached to the rotary shaft located in or near the screw feeder portion;
The short-fiber supply device, wherein the paddle blade is bent or curved at an angle of 10 to 100 degrees toward a rotation direction of the paddle blade.   2. The ratio of the total length l of the paddle blade and the distance a from the base end of the paddle blade to the center of the curved portion: a / l is 0.1 to 0.8. Short fiber feeder.   3. The short fiber supply device according to claim 1, wherein a plurality of the paddle blades are provided at positions spaced apart by a predetermined distance along the length direction of the rotation shaft.   The short fiber feeder according to any one of claims 1 to 3, wherein the hopper has a conical portion connected to a hopper discharge port, and the screw feeder portion is located in the conical portion. .   The short fiber supply device according to claim 4, wherein a difference between an inner diameter of the hopper discharge port and an outer diameter of the screw feeder is 10 to 100 mm.   The short fiber supply device according to any one of claims 1 to 5, wherein the short fibrous material is a sludge dewatering aid having a moisture content of 20 to 70% by weight and a length of 1 to 50 mm.

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