JP2019151020A - Fiber dispersion mechanism, and fiber-reinforced concrete production device - Google Patents

Abstract

To improve production efficiency, and further, to stably feed uniformly loosen fiber.SOLUTION: Fiber dispersion mechanisms (2a, 2b) each comprises: a rotary drum (25) rotating with a first shaft center (23a) crossed with a straight line drawn in a gravity direction as the center; and a driving part (26) rotatively driving the rotary drum (25). A hole (h2) taking the fiber before dispersion in a space at the inside of the rotary drum (25) is formed at at least either two side plates (25b, 25c) crossed with the first shaft center (23a), provided at the rotary drum (25), and an opening part (h3) exhausting the dispersed fiber is formed at the outer circumferential wall (25d) of the rotary drum (25).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fiber dispersion mechanism that disperses fibers that form a composition material of fiber reinforced concrete, and a fiber reinforced concrete manufacturing apparatus that includes the fiber dispersion mechanism.

  In a conventional fiber reinforced concrete manufacturing apparatus 100 as shown in FIG. 6 (hereinafter abbreviated as “manufacturing apparatus 100”), short fibers (not shown) weighed in advance in a predetermined amount are finely loosened manually. Then, the short fiber is introduced into the fiber loosening part 52 from the opening of the fiber introduction part 51. As shown in FIG. 6A, the fiber loosening part 52 is a structure in which a plurality of rod-like bodies 52 a are arranged in a sawtooth shape, and is arranged at the bottom of the fiber input part 51. “Short fibers” are fibers that are kneaded into concrete and cut into a length of several millimeters to several centimeters.

  Then, as shown in FIG. 6B, the short fibers that have fallen on the chute 53 communicating with the fiber feeding unit 51 through the fiber loosening unit 52 are vibrated by the vibration unit 54 installed on the chute 53. Is further loosened and supplied to the kneading apparatus 40.

  In this way, the short fibers are loosened manually in advance and then supplied to the kneading apparatus 40 to prevent the short fibers from being entangled with each other to form a coarse lump. Furthermore, the so-called “fiber balls (clusters of short fibers)” are prevented from being formed on the fiber reinforced concrete.

  The sand as the coarse aggregate is supplied to the kneading device 40 by the first supply unit 60. In addition, the cement is supplied to the kneading apparatus 40 by the second supply unit 70. Further, the gravel as the coarse aggregate is supplied to the kneading apparatus 40 by the third charging unit 80 and the fourth charging unit 90.

  However, when manufacturing fiber reinforced concrete using the manufacturing apparatus 100, it is necessary to unravel the short fibers by hand before putting them into the fiber unraveling section 52, and the production efficiency due to the occurrence of complicated preparation work and the like is required. It was causing a decline.

  In addition, there is a problem that unraveling short fibers by manual work causes variations in the amount of fibers supplied, or the operator cannot fully unravel the short fibers. In this case, the short fibers are not evenly mixed in other concrete composition materials (coarse aggregate, cement, etc.), resulting in the formation of fiber balls in the fiber reinforced concrete and uneven strength in the cured concrete. There is a possibility of becoming.

  The present invention has been made in view of the above-described problems, and an object thereof is to realize a fiber dispersion mechanism or the like that can improve the production efficiency and can stably supply the fibers that are loosened uniformly. It is in.

  In order to solve the above-described problem, a fiber dispersion mechanism according to one aspect of the present invention is a fiber dispersion mechanism that disperses fibers to be a composition material of fiber-containing concrete, and that intersects a straight line extending in the direction of gravity. A rotary drum that rotates about a single axis, and a drive unit that rotationally drives the rotary drum, the two provided on the rotary drum intersecting the first axis At least one of the side plates is formed with an insertion port for taking in the fibers before dispersion into the space inside the rotary drum, and the dispersed fibers are discharged to the outer peripheral wall of the rotary drum. It is the structure in which the opening part to be formed is formed.

  According to the said structure, a fiber is taken in into the space inside a rotary drum by making the insertion port take in the fiber before dispersion | distribution. Moreover, the fiber taken in the space inside a rotary drum is loosened by rotating a rotary drum with a drive part. Further, the loosened fibers are discharged from an opening formed in the outer peripheral wall of the rotary drum. As a result, the loosened fibers in the rotary drum are dispersed and dropped onto the downstream equipment.

  That is, according to the fiber dispersion mechanism according to one aspect of the present invention, the fibers taken into the space inside the rotary drum of the fiber dispersion mechanism are automatically loosened and dispersed without manual operation. Dropped into the equipment. For this reason, the manufacturing efficiency of fiber-reinforced concrete can be improved.

  Moreover, according to the said structure, the fiber loosened uniformly can be supplied stably by setting the rotational speed of a rotary drum appropriately. As described above, according to the fiber dispersion mechanism according to one aspect of the present invention, it is possible to improve the production efficiency and stably supply the fibers that are uniformly loosened.

  In the fiber dispersion mechanism according to one aspect of the present invention, a plurality of rod-shaped bodies are arranged in parallel to each other on the outer peripheral wall of the rotary drum so as to surround the periphery of the first axis, and are adjacent to each other. A first gap as the opening may be formed between the two rod-like bodies. According to the said structure, by rotating a rotary drum, a fiber is disperse | distributed from each 1st clearance gap of a some rod-shaped body, and is dropped to the downstream installation. Thereby, the uniformly dispersed fiber can be stably supplied.

  The fiber dispersion mechanism according to an aspect of the present invention is disposed in a spiral shape so as to surround the storage portion that stores the fibers before dispersion and the second axis that intersects the straight line extending in the direction of gravity. A conveying mechanism having a conveying blade, wherein the conveying blade is formed continuously from the reservoir to at least the insertion port of the rotary drum, and rotates about the second axis. The fiber may be supplied to the space. According to the above configuration, the transport mechanism includes the transport blades disposed in a spiral shape so as to surround the first shaft center. For this reason, the fiber is conveyed in the axial direction by rotating the conveying blade around the second axis. Therefore, the fibers can be conveyed toward the rotary drum by appropriately setting the direction of rotation. Further, by rotating the conveying blade at a constant speed, a certain amount of fiber is conveyed toward the rotary drum.

  In the fiber dispersion mechanism according to one aspect of the present invention, a second gap may be formed between the conveying blade and the second axis. According to the above configuration, the second gap is formed between the second shaft center and the conveying blade. Since the fibers are conveyed through the second gap, the possibility that the fibers are entangled with the conveying blades can be reduced. In this way, a certain amount of fibers can be smoothly conveyed toward the rotary drum.

  An apparatus for manufacturing fiber-reinforced concrete according to one aspect of the present invention is an apparatus for manufacturing fiber-reinforced concrete in which fibers for reinforcing concrete are mixed with concrete, the hopper storing the fibers, the fiber dispersion mechanism, The fiber dispersion mechanism may be installed vertically below the hopper, and the fibers falling from the hopper may be received by the storage unit. According to the above configuration, the fibers falling from the hopper can be finely loosened and dispersed by the fiber dispersion mechanism, so that the uniformly loosened fibers can be stably supplied.

  An apparatus for producing fiber-reinforced concrete according to an aspect of the present invention is an apparatus for producing fiber-reinforced concrete in which fibers for reinforcing concrete are mixed with concrete, and a measuring instrument for measuring the fibers by a certain amount; A fiber dispersion mechanism, wherein the fiber dispersion mechanism is installed vertically below the measuring instrument, and the fibers falling from the measuring instrument may be received by the storage unit. According to the said structure, the fixed quantity of fiber which was loosened uniformly can be supplied stably by finely loosening and dispersing the fiber measured by the fixed quantity by the measuring instrument finely by the fiber dispersion mechanism.

  According to the fiber dispersion mechanism according to an aspect of the present invention, it is possible to improve the production efficiency and to stably supply uniformly loosened fibers.

It is a figure which shows the external appearance structure of the manufacturing apparatus of the fiber reinforced concrete which concerns on one Embodiment of this invention. It is a figure which shows the detail of the structure of the fiber dispersion mechanism which concerns on one Embodiment of this invention. It is a figure which shows the structure in a storage part regarding the said fiber dispersion | distribution mechanism. It is a perspective view which shows the external appearance of the said fiber dispersion mechanism. It is a figure which shows the external appearance of a hopper. (A) is a top view which shows schematic structure of the manufacturing apparatus of the conventional fiber reinforced concrete. (B) is a side view which shows schematic structure of the manufacturing apparatus of the conventional fiber reinforced concrete.

[Fiber-reinforced concrete production equipment]
First, a schematic configuration of a fiber-reinforced concrete manufacturing apparatus 10 according to an embodiment of the present invention will be described with reference to FIG. The fiber reinforced concrete manufacturing apparatus 10 is an apparatus that manufactures fiber reinforced concrete in which fibers for reinforcing concrete such as synthetic fibers and steel fibers are mixed with concrete. (A) of FIG. 1 is a figure which shows schematic structure of the fiber reinforced concrete manufacturing apparatus 10. As shown in FIG. Moreover, (b) of FIG. 1 is a figure which shows a mode when the fiber reinforced concrete manufacturing apparatus 10 shown to (a) of FIG. 1 is seen from the left side. As shown in these drawings, the fiber reinforced concrete manufacturing apparatus 10 includes a hopper 1, a fiber dispersion mechanism 2a, a conveyor 3, a meter 4, a fiber dispersion mechanism 2b, a chute 5, and a kneading mechanism 7.

  The hopper 1 temporarily stores the short fibers (fiber: not shown) that are the composition material of the fiber reinforced concrete, and drops the stored short fibers onto the downstream equipment. The shape of the hopper 1 is preferably a cylindrical straight shape in order to prevent bridging. Here, the “bridge” is a phenomenon in which the short fibers adhere to the wall surface or are compressed near the outlet at the lower part of the hopper 1 to prevent the upper part from flowing out. The “short fiber” is a fiber that is kneaded into concrete and cut into a length of several millimeters to several centimeters. The short fiber is not particularly limited as long as it can exert a reinforcing effect on the concrete, and examples thereof include metal fiber, glass fiber, organic fiber, and carbon fiber. Moreover, you may use together 2 or more types of metal fiber, glass fiber, organic fiber, and carbon fiber as a short fiber.

  Examples of the metal fiber include steel fiber, stainless steel fiber, and amorphous fiber. Moreover, as an organic fiber, a vinylon fiber, a polypropylene fiber, or a polyethylene fiber is mentioned, for example. Examples of the carbon fiber include PAN (Polyacrylonitrile) -based carbon fiber and pitch-based carbon fiber. From the viewpoint of increasing the bending strength and the like of the hardened concrete, it is preferable to use metal fibers as the short fibers. On the other hand, from the viewpoint of increasing the breaking energy of the cured body, it is preferable to use organic fibers or carbon fibers as the short fibers.

  A hopper lower mechanism 1a is provided at the lower part of the hopper 1 (see FIG. 5), and the hopper lower mechanism 1a is provided with a plurality of rotary ejecting blades 1c capable of stably taking out a short amount of short fibers. It has been. In the present embodiment, four rotary scraping blades 1c are provided around the rotary shaft 1b. The rotational speed of the rotary scraping blade 1c can be varied according to the take-out capability. According to the hopper 1, the stored short fibers can be taken out by the rotary scraping blade 1c without being blocked by the bridge.

  The fiber dispersion mechanisms 2a and 2b each loosen and disperse the short fibers, which are the composition material of the fiber reinforced concrete, and drop them to the downstream equipment. FIG. 2 is a diagram showing details of the structure of the fiber dispersion mechanisms 2a and 2b. As shown in FIG. 2, the fiber dispersion mechanisms 2 a and 2 b include a transport mechanism 21 and a rotary drum 25. The transport mechanism 21 includes a storage unit 20 that stores the short fibers, and transports the short fibers stored in the storage unit 20 to the rotary drum 25. The rotary drum 25 rotates and disperses the short fibers transported by the transport mechanism 21 and drops them on the downstream equipment. FIG. 3 is a diagram illustrating a structure inside the storage unit 20.

  The fiber dispersion mechanisms 2a and 2b are provided with a rotary drum 25. As will be described later, the rotary drum 25 has a structure having a plurality of rod-like bodies 25a provided at a constant pitch L in the circumferential direction of a circle centered on the position of the first axis 23a. (See FIG. 4). That is, on the outer peripheral wall 25d of the rotary drum 25, a plurality of rod-like bodies 25a are arranged in parallel to each other so as to surround the first axis 23a. Further, a first gap is formed between the two rod-like bodies 25a adjacent to each other, and serves as an opening h3. Thus, the short fiber can be finely dispersed by rotating the rotary drum 25 around the first axis 23a, and supplied to the subsequent equipment (not shown).

  In addition, as shown in FIG. 2, the short fiber is thrown into the inside of the storage part 20 through the hole h1 formed in the upper part of the storage part 20 (refer arrow a). As a result, the short fibers are stored inside the storage unit 20. Next, in one of the two side plates 25b, 25c intersecting the first axis 23a provided on the rotary drum 25, the fiber before dispersion is placed in the space inside the rotary drum 25. A hole (insertion opening) h2 is formed. The short fibers stored in the storage unit 20 are transported and taken into the space inside the rotary drum 25 via the hole h2 by the transport mechanism 21 (see arrow b).

  In the present embodiment, the case where the extending direction of the first axis 23a is set to a substantially horizontal direction will be described as an example, but the extending direction of the first axis 23a is not limited to this. The first axis 23a only needs to intersect a straight line extending in the direction of gravity.

  Further, the fibers loosened by the rotary drum 25 are discharged from the opening h3 formed in the outer peripheral wall 25d of the rotary drum 25, and fall into the box body arranged immediately below the rotary drum 25 ( Supply). As described above, the rotary drum 25 supplies the short fibers to the inside of the box disposed immediately below the rotary drum 25 while rotating and dispersing the short fibers transported by the transport mechanism 21. Specifically, it is dropped to the downstream equipment through a hole h4 formed in the lower wall of the box (see arrow c).

  Here, the box disposed immediately below the rotary drum 25 is a role for preventing fibers that are discharged from the opening h3 of the rotary drum 25 and falling downward from being scattered in an unexpected direction. Fulfill.

  The short fibers conveyed to the rotary drum 25 are loosened by the rotation of the rotary drum 25, dispersed, and dropped to the downstream equipment. In other words, according to the fiber dispersion mechanisms 2a and 2b, the short fibers stored in the storage unit 20 are automatically loosened without manual operation, dispersed, and dropped to the downstream equipment. For this reason, the manufacturing efficiency of fiber-reinforced concrete can be improved. In addition, by appropriately setting the rotational speed of the rotary drum 25, it is possible to stably supply the short fibers that are uniformly loosened. As described above, according to the fiber dispersion mechanisms 2a and 2b, it is possible to improve the production efficiency and to stably supply the fibers that have been loosened uniformly. The rotational speed of the rotary drum 25 can be varied according to the short fibers used.

  Next, FIG. 4 is a perspective view showing the appearance of the fiber dispersion mechanism. As shown in the figure, the rotary drum 25 is arranged so as to surround the first axis 23a when viewed from the direction of the first axis 23a that defines the rotation center of the rotary drum 25. A plurality of rod-like bodies 25a are provided. From another viewpoint, the rotary drum 25 is a rotary rod made up of a plurality of rod-like bodies 25a provided at a constant pitch L in the circumferential direction of a circle centered on the position of the first axis 23a. . According to the said structure, by rotating the 1st axial center 23a, a fiber disperse | distributes from each clearance gap of the some rod-shaped body 25a, and is dropped to the downstream installation. Thereby, the uniformly dispersed fiber can be stably supplied.

  The cross-sectional shape of the rod-shaped body 25a is a circle, triangle, square, rectangle or the like, preferably a round shape, and the circumferential mounting pitch L is optimal depending on the shape of the fiber used. Specifically, the pitch L between each of the plurality of rod-like bodies 25a is preferably 10 mm or more and 50 mm or less.

  When the pitch L is 10 mm or more, it becomes easy for the short fibers to fall from the gaps between the plurality of rod-like bodies 25a, and the production efficiency of the fiber-reinforced concrete is improved. On the other hand, when the pitch L is 50 mm or less, the formation of fiber balls can be suppressed.

  The form of the rotary drum 25 is not limited to the form in which the rotary drum 25 is composed of a plurality of rod-like bodies 25a. For example, a form in which a plurality of slits (openings) through which short fibers pass is provided on the side surface of the drum-like rotary drum 25 may be employed.

  Next, as shown in FIG. 2, the transport mechanism 21 includes a second axis 23 b, a transport blade 24, and a drive unit 26 in addition to the storage unit 20 described above. Note that the first axis 23a and the second axis 23b described above may be on the same straight line as in this embodiment, or may not be on the same straight line.

  In the present embodiment, the case where the extending direction of the second axis 23b is set to a substantially horizontal direction will be described as an example, but the extending direction of the second axis 23b is not limited to this. The second axis 23b only needs to intersect a straight line extending in the direction of gravity.

  The second axis 23b defines the center of rotation of the transport mechanism 21, and the drive unit 26 rotates the second axis 23b. The conveying blades 24 are spirally disposed so as to surround the second axis 23 b, and convey the short fibers from the storage unit 20 toward the rotary drum 25. The drive unit 26 rotates the second axis 23b using air, hydraulic pressure, or electricity.

  According to the said structure, a short fiber is conveyed in the direction in alignment with the 2nd axial center 23b by rotating the 2nd axial center 23b. Further, the conveying blade 24 is formed continuously from the storage unit 20 to at least the hole h <b> 2 of the rotary drum 25. Therefore, by setting the rotation direction of the second shaft center 23b appropriately, the short fibers can be conveyed from the storage unit 20 toward the rotary drum 25 (short in the space inside the rotary drum 25). Fiber can be incorporated).

  Further, by rotating the second shaft center 23 b at a constant speed, a certain amount of short fibers are conveyed from the storage unit 20 toward the rotary drum 25. As shown in FIG. 3, a gap CR (second gap) is preferably formed between the second shaft center 23b and the conveying blade 24, and the short fibers are conveyed through the gap CR. Therefore, the possibility that the short fibers are entangled with the conveying blade 24 can be reduced. In this way, a certain amount of short fibers can be smoothly conveyed from the storage unit 20 toward the rotary drum 25. In the above-described embodiment, the first shaft center 23a of the rotary drum 25 and the second shaft center 23b of the transport mechanism 21 are described as a common shaft center. However, these shaft centers are described. May be configured separately and independently.

  Next, as shown in FIG. 1 (a), the fiber dispersion mechanism 2a is installed vertically below the hopper 1 described above, and the short fibers falling from the hopper 1 are stored in the storage unit 20 of the fiber dispersion mechanism 2a. You may make it receive. Thereby, the short fibers falling from the hopper 1 are finely loosened and dispersed by the fiber dispersion mechanism 2a, so that the uniformly loose fibers can be stably supplied. The conveyor 3 transports a certain amount of short fibers finely dispersed by the fiber dispersion mechanism 2 a to the measuring device 4.

  The measuring device 4 automatically measures the short fibers by a predetermined constant weight (measurement difference ± 1%). The measuring device 4 is disposed vertically below the upper end of the conveyor 3 and vertically above the storage unit 20 of the fiber dispersion mechanism 2b. The fibers finely dispersed and supplied by the fiber dispersion mechanism 2b are automatically weighed to a weight set to a constant value by the meter 4.

  Next, as shown in FIG. 1, the fiber dispersion mechanism 2b may be installed vertically below the meter 4, and the short fibers falling from the meter 4 may be received by the storage unit 20 of the fiber dispersion mechanism 2a. As a result, the short fibers weighed by a certain amount by the measuring device 4 are finely loosened and dispersed by the fiber dispersion mechanism 2b, so that a certain amount of fibers that are uniformly loosened can be stably supplied.

  A chute 5 is provided between the fiber dispersion mechanism 2 b and the kneading mechanism 7. The chute 5 is provided with an inclination of an angle of 47 ° or more at which the finely dispersed short fibers can fall by its own weight, and the short fibers are dropped into the kneading mechanism 7. An air jet device 6 for efficiently floating and dispersing the short fibers is provided in the lower portion of the chute 5 over the entire interior of the kneading mechanism 7 (see FIG. 1B). The air injection pressure of the air injection device 6 is 0.2 to 0.6 Mpa, preferably 0.4 Mpa. Note that the angle of the chute 5 described above is set to an angle at which the short fibers can be emitted at a certain distance before the air injection device 6 provided at the lower part of the chute 5.

  Other composition materials kneaded with the short fibers in the kneading mechanism 7 include cement, coarse aggregate, water reducing agent, water and the like. Examples of the cement include various Portland cements such as ordinary Portland cement and early-strength Portland cement. Examples of the coarse aggregate include river sand, land sand, sea sand, crushed sand, silica sand, or a mixture thereof. Examples of water reducing agents include lignin-based water reducing agents, AE (Air Entraining Agent) water reducing agents, and high performance water reducing agents.

  The vibration exciter 8 is for smoothly dropping short fibers along the chute 5 inclined by vibration. When the short fiber cannot be dropped due to its own weight, the vibrator 8 is provided as described above to forcibly drop the short fiber by vibration.

  According to the fiber reinforced concrete manufacturing apparatus 10 described above, a coarse lump formed by short fibers of different types (wire diameters and lengths) can be automatically loosened by the fiber dispersion mechanisms 2a and 2b. Further, the weight of the short fiber is automatically weighed to a set weight by the measuring device 4 (measuring difference ± 1%), and the short fiber is uniformly dispersed throughout the kneading mechanism 7 by the air injection device 6. Can be supplied. Therefore, high-quality fiber-reinforced concrete that does not generate fiber lumps (fiber balls) can be efficiently produced.

[Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Hopper 2a, 2b Fiber dispersion | distribution mechanism 4 Measuring instrument 10 Fiber reinforced concrete manufacturing apparatus 20 Storage part 21 Conveyance mechanism 23a 1st axial center 23b 2nd axial center 24 Conveyance blade 25 Rotary drum 25a Rod-shaped body 25b, 25c Side plate 26 Drive unit CR gap (second gap)
h2 hole (insertion slot) h3 opening (first gap)

Claims (6)

A fiber dispersion mechanism that disperses fibers that become a composition material of fiber-containing concrete,
A rotary drum that rotates about a first axis that intersects a straight line extending in the direction of gravity;
A drive unit that rotationally drives the rotary drum,
At least one of the two side plates intersecting the first axis provided in the rotary drum is formed with an insertion port for taking the fibers before dispersion into the space inside the rotary drum. Has been
An opening for discharging the dispersed fibers is formed in the outer peripheral wall of the rotary drum. On the outer peripheral wall of the rotary drum, a plurality of rod-shaped bodies are arranged in parallel to each other so as to surround the first axis.
2. The fiber dispersion mechanism according to claim 1, wherein a first gap as the opening is formed between the two rod-like bodies adjacent to each other. A transport mechanism having a storage section for storing fibers before dispersion and a transport blade spirally disposed so as to surround the periphery of the second axis that intersects the straight line extending in the direction of gravity;
The conveying blade is formed continuously from the storage section to at least the insertion port of the rotary drum, and supplies the fibers to the space by rotating around the second axis. The fiber dispersion mechanism according to claim 1 or 2.   The fiber dispersion mechanism according to claim 3, wherein a second gap is formed between the conveying blade and the second axis. An apparatus for producing fiber reinforced concrete in which fibers for reinforcing concrete are mixed with concrete,
A hopper for storing the fibers;
A fiber dispersion mechanism according to claim 3 or 4,
The said fiber dispersion | distribution mechanism is installed in the perpendicular | vertical lower side of the said hopper, The said fiber which falls from the said hopper is received in the said storage part, The manufacturing apparatus of the fiber reinforced concrete characterized by the above-mentioned. An apparatus for producing fiber reinforced concrete in which fibers for reinforcing concrete are mixed with concrete,
A measuring instrument for weighing the above-mentioned fibers by a certain amount;
A fiber dispersion mechanism according to claim 3 or 4,
The said fiber dispersion | distribution mechanism is installed in the perpendicular | vertical lower side of the said measuring device, The said fiber which falls from the said measuring device is received in the said storage part, The manufacturing apparatus of the fiber reinforced concrete characterized by the above-mentioned.

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