JP7153453B2 - Supply mechanism and concrete kneading device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a supply mechanism for fibers, which are constituent materials of fiber-reinforced concrete, and a concrete kneading apparatus provided with the supply mechanism.

In a conventional fiber-reinforced concrete manufacturing apparatus 100 (hereinafter abbreviated as "manufacturing apparatus 100") as shown in FIG. Then, short fibers are introduced into the fiber disentanglement section 52 from the opening of the fiber introduction section 51 . As shown in FIG. 1(a), the fiber loosening section 52 is a structure in which a plurality of rod-shaped bodies 52a are arranged in a slatted shape, and is arranged at the bottom of the fiber input section 51. As shown in FIG. "Short fibers" are fibers cut into lengths of several millimeters to several centimeters for use by being kneaded into concrete.

Then, as shown in FIG. 1(b), the short fibers that have fallen through the fiber untangling section 52 onto the chute 53 communicating with the fiber feeding section 51 are vibrated by the vibrating section 54 installed in the chute 53. and is supplied to the kneading device 40 .

In this way, by manually loosening the short fibers before supplying them to the kneading device 40, it is possible to prevent the short fibers from entangling with each other and forming a coarse mass. Furthermore, it prevents the formation of so-called "fiber balls" in the fiber-reinforced concrete.

Sand as fine aggregate is supplied to the kneading device 40 by the first supply unit 60 . Also, the cement is supplied to the kneading device 40 by the second supply section 70 . Furthermore, gravel as coarse aggregate is supplied to the kneading device 40 by the third input section 80 and the fourth input section 90 .

However, when manufacturing fiber-reinforced concrete using the manufacturing apparatus 100, it is necessary to manually loosen the short fibers before feeding them into the fiber loosening unit 52, resulting in a decrease in production efficiency. In addition, it is necessary to arrange a worker for loosening the short fibers, and the labor cost for the worker may lead to an increase in the cost of manufacturing fiber-reinforced concrete.

Further, when short fibers are loosened manually, there is a problem that the supply amount of fibers varies, or the short fibers cannot be sufficiently loosened by the operator. In this case, the short fibers are not evenly mixed into the other concrete composition materials (aggregate, cement, etc.), resulting in the formation of fiber balls in the fiber-reinforced concrete and uneven strength in the hardened concrete. There is also the possibility of becoming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to stably supply uniformly loosened short fibers to a kneading apparatus simply and at low cost.

In order to solve the above problems, a supply mechanism according to one aspect of the present invention provides a kneading mechanism for kneading fibers, which are constituent materials of fiber-reinforced concrete, with other constituent materials in a concrete kneading device. a supply mechanism for supply, comprising: a chute for guiding the fibers from an inlet to the kneading mechanism; It has

According to the above arrangement, the feeding mechanism comprises at least one first fiber dispersing section having a vertical dispersing portion that reciprocates vertically within the chute. Therefore, the fibers that have dropped into the chute from the inlet are dispersed in the substantially vertical direction by the reciprocating motion of at least one vertical dispersion portion, so that the fibers in the chute can be effectively dispersed. That is, fibers can be uniformly and stably supplied to the inside of the kneading mechanism without manual work.

In addition, since the labor for loosening the fibers manually in advance can be saved, the production efficiency is improved by using the supply mechanism according to the present invention, and fiber-reinforced concrete can be produced easily and at low cost. Furthermore, since it is no longer necessary to manually feed the fibers into the chute, it is possible to reduce variations in the amount of fiber supplied by automatic fiber supply.

As described above, high-quality fiber-reinforced concrete in which fibers are uniformly dispersed can be stably produced easily and at low cost.

Further, in order to solve the above problems, a supply mechanism according to an aspect of the present invention includes a second fiber dispersing section having a horizontal dispersing portion that horizontally reciprocates within the chute, The fiber-dispersed portion is arranged vertically above the first fiber-dispersed portion.

According to the above configuration, after the fibers are introduced into the inlet of the chute, the fibers are first dispersed in the substantially horizontal direction by the reciprocating motion of the horizontal dispersion portion. The substantially horizontally dispersed fibers are further dispersed substantially vertically by the reciprocating motion of at least one vertical dispersion portion. Therefore, since the fibers are dispersed in two directions after the fibers are added, the fibers can be dispersed more effectively.

Therefore, the fibers can be uniformly supplied to the interior of the kneading mechanism in a state where the fibers are more uniformly loosened, and high-quality fiber-reinforced concrete can be stably manufactured easily and at a low cost. be able to.

Further, in order to solve the above problems, the supply mechanism according to one aspect of the present invention includes a plurality of the first fiber dispersing units, and an extrusion device that extrudes the fibers into the chute. The extruding device is arranged vertically above the first fiber dispersion section, which is arranged on the most vertically lower side among the plurality of first fiber dispersion sections.

According to the above configuration, since the supply mechanism includes the plurality of first fiber dispersing units, it is possible to more reliably disperse the fibers introduced into the chute in the substantially vertical direction.

In addition, since the supply mechanism is equipped with an extrusion device, the fibers put into the chute are dropped by the extrusion device over the entire vertical dispersion portion of the first fiber dispersion section arranged directly below the extrusion device. Therefore, it is possible to prevent the fibers put into the chute from clumping and falling near the tip of the vertical dispersion part in the first fiber dispersing section arranged directly under the extruder, and the first fiber dispersing section A substantially vertical distribution of the fibers can be performed more effectively.

As described above, the fibers can be uniformly supplied to the interior of the kneading mechanism in a state where the fibers are more uniformly loosened, and high-quality fiber-reinforced concrete can be produced easily and stably at low cost. be able to.

Further, in order to solve the above problems, the supply mechanism according to one aspect of the present invention includes an air injection section that injects air toward the fibers that have fallen into the inside of the kneading mechanism through the chute. .

According to the above configuration, the supply mechanism includes an air injection section that injects air toward the fibers that have fallen inside the kneading mechanism. Therefore, the fibers that have fallen inside the kneading mechanism can be uniformly dispersed inside the kneading mechanism when the fibers are kneaded with other composition materials that have been introduced into the kneading mechanism. Therefore, since the finely dispersed fibers are kneaded with other composition materials in a substantially intact state, it is possible to effectively prevent a portion of the fibers from being turned into coarse lumps and supplied to the kneading mechanism. can.

As described above, the fibers can be uniformly supplied to the interior of the kneading mechanism in a state where the fibers are more uniformly loosened, and high-quality fiber-reinforced concrete can be produced easily and stably at low cost. be able to.

Further, in order to solve the above problems, the supply mechanism according to one aspect of the present invention includes an inspection door in which the air injection unit is provided in the kneading mechanism so that it can be opened and closed for internal inspection of the kneading mechanism. Alternatively, it is arranged near the inspection door.

According to the above configuration, since the air injection section is arranged at or near the inspection door, the air injection section can be visually recognized from the outside of the kneading mechanism simply by opening the inspection door. Therefore, the state of the air injection portion can be easily grasped, and maintenance work can be easily performed.

In addition, when the inspection door is opened for periodical inspection of the kneading mechanism or the like, maintenance work or the like of the air injection section can also be performed at the same time, thereby improving work efficiency.

Further, in order to solve the above problems, a concrete kneading apparatus according to an aspect of the present invention includes a kneading mechanism for kneading fibers, which are constituent materials of fiber-reinforced concrete, and other constituent materials, and The supply mechanism according to any one of the above aspects is provided for supplying to the kneading mechanism. According to the above configuration, it is possible to realize a concrete kneading apparatus capable of stably producing high-quality fiber-reinforced concrete simply and at low cost.

ADVANTAGE OF THE INVENTION According to one aspect of the present invention, fibers can be uniformly loosened without manual work, and uniformly loosened fibers can be stably supplied to a kneading mechanism easily and at low cost.

(a) is a top view showing a schematic configuration of a conventional manufacturing apparatus for fiber-reinforced concrete. (b) is a side view showing a schematic configuration of a conventional manufacturing apparatus for fiber-reinforced concrete. 1 is a schematic diagram showing the structure of a main part of a fiber feeding mechanism according to one embodiment of the present invention; FIG. 3(a) is a top view showing a schematic configuration of a first sieve provided in the fiber feeding mechanism shown in FIG. 2. FIG. (b) is a side view showing a schematic configuration of a first sieve. 3(a) is a side view showing a schematic configuration of second to fourth sieves provided in the fiber feeding mechanism shown in FIG. 2. FIG. (b) is a top view showing the schematic configuration of the second to fourth sieves. 3A is a top view showing a schematic configuration of an extrusion device provided in the fiber supply mechanism shown in FIG. 2; FIG. (b) is a side view showing a schematic configuration of an extrusion device. 3(a) to 3(c) are schematic diagrams showing the structure of part of an air blower and a kneading mechanism provided in the fiber feeding mechanism shown in FIG. 2. FIG.

<Structure of Fiber Supply Mechanism>
First, referring to FIG. 2, the structure of the fiber feeding mechanism 1 according to one embodiment of the present invention will be described. FIG. 2 is a schematic diagram showing the structure of the main parts of the fiber feeding mechanism 1. As shown in FIG. In FIG. 2, the vertical direction corresponds to the vertical direction, the upper side corresponds to the vertical upper side, and the lower side corresponds to the vertical lower side. Also, the horizontal direction corresponds to the horizontal direction when facing the paper surface.

The fiber supply mechanism 1 (supply mechanism) supplies the kneading mechanism 20 with short fibers (fibers: not shown), which are constituent materials of fiber-reinforced concrete. As shown in FIG. 2, the fiber feeding mechanism 1 includes a scale 10, a chute 11, a first sieve 12 (second fiber dispersing section), a second sieve 13 (first fiber dispersing section), a third sieve 14, a 4 sieve 15, extrusion device 16, air blower 17 (air injector), vibrating section 18, auxiliary air injection section 19 and partition plate 1a.

Here, the kneading mechanism 20 kneads the short fibers supplied from the fiber supply mechanism 1 and other composition materials. is used. The kneading mechanism 20 is arranged vertically below the fiber supply mechanism 1, and the kneading mechanism 20 and the chute 11 communicate with each other.

The fiber supply mechanism 1 and the kneading mechanism 20 constitute a concrete kneading device 100 . Note that the short fibers supplied to the kneading mechanism 20 by the fiber supply mechanism 1 may be those that can exert a reinforcing effect on concrete, and examples thereof include metal fibers, glass fibers, organic fibers, and carbon fibers. be done. Moreover, two or more of metal fibers, glass fibers, organic fibers, and carbon fibers may be used together as short fibers.

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

Other composition materials to be kneaded with the short fibers in the kneading mechanism 20 include cement, aggregate, water reducing agent, water, and the like. Examples of cement include various Portland cements such as ordinary Portland cement and high-early-strength Portland cement. Aggregates include, for example, river sand, land sand, sea sand, crushed sand, silica sand, and mixtures 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 weighing device 10 is arranged vertically above the chute 11, weighs one batch of short fibers out of the short fibers supplied to the weighing device 10, divides the short fibers into small batches, and shoots them. 11.

The chute 11 guides the short fibers supplied from the weighing machine 10 for each batch to the kneading mechanism 20 through the inlet 11g. The chute 11 extends from the vertically upper side to the vertically lower side, and communicates with the kneading mechanism 20 arranged at the extension destination.

Specifically, of the peripheral wall 11a forming the outer shape of the chute 11, the first end portion 11b, which is the vertically upper portion, extends substantially vertically. Further, of the peripheral wall 11a, the main body portion 11c, which is a portion between the first end portion 11b and the connection point of the chute 11 and the kneading mechanism 20, is inclined with respect to the vertical direction from the vertical upper side to the vertical lower side. stretching towards.

In addition, the first portion of the main body portion 11c from the vertically upper end to the location where the fourth sieve 15 is arranged was restricted from the vertically upper side to the vertically lower side (with respect to the extending direction of the chute). The cross-sectional area in the orthogonal direction gradually decreases). With such an outer shape, the falling short fibers can be collected in the fourth dispersion portion 15a (vertical dispersion portion) of the fourth sieve 15, and the short fibers are effectively dispersed by the fourth sieve 15. be able to.

Further, in the main body portion 11c, the horizontal width of the second portion from the portion where the fourth sieve 15 is arranged to the connection portion with the kneading mechanism 20 is equal to the vertically lower end portion of the first portion. is greater than the horizontal width at By adopting such an outer shape, the space formed in the second portion is widened, and the supply port for the short fibers formed in the connection portion is also enlarged. Therefore, the short fibers can be dispersed over a wide area by the fourth screen 15, and the short fibers can be supplied to the kneading mechanism 20 while being dispersed over a wide area.

An inner surface 11f of the main body portion 11c of the chute 11, which faces vertically upward, has a plurality of slits 11e extending in a direction substantially parallel to the extending direction of the main body portion 11c. The book is formed. By forming a plurality of slits 11e, it is possible to reduce the possibility that the short fibers that have dropped and deposited on the inner surface 11f will form coarse lumps. In addition, in combination with the vibration of the chute 11 by the two vibrating units 18, the short fibers can be shaken off from the inner surface 11f while loosening the short fibers.

Note that, as in the present embodiment, the first end portion 11b of the peripheral wall 11a of the chute 11 extends in a substantially vertical direction, and the body portion 11c is inclined with respect to the vertical direction from the vertically upper side to the vertically lower side. It is not essential that it extends towards For example, it is possible to employ a chute 11 having an outer shape extending in the vertical direction for both the first end portion 11b and the body portion 11c. In other words, the chute 11 may have a shape and structure capable of guiding the short fibers from the inlet 11g to the kneading mechanism 20.

The first sieve 12 disperses the short fibers supplied batchwise from the scale 10 in the hollow portion 11 d of the chute 11 in a substantially horizontal direction. In addition, the second sieve 13 further disperses the short fibers for one batch substantially horizontally dispersed by the first sieve 12 in the substantially vertical direction within the hollow portion 11d.

Both the first sieve 12 and the second sieve 13 are arranged at the first end portion 11 b , and the first sieve 12 is arranged vertically above the second sieve 13 . Specifically, the first sieve 12 and the second sieve 13 are arranged at positions facing each other at the first end portion 11b, and the first dispersed portion holding portion 12a of the first sieve 12 and the second sieve 13 are arranged to face each other. overlaps with the second dispersion portion 13a in plan view.

The third sieve 14 (first fiber dispersing section) further disperses the short fibers for one batch dispersed by the first sieve 12 and the second sieve 13 in the substantially vertical direction within the hollow portion 11d. In addition, the third sieve 14 is arranged at the first portion of the main body portion 11c so that the tip of the third dispersed portion 14a (vertical dispersed portion) is located near the auxiliary air injection portion 19 arranged at the formation portion of the slit 11e. placed in By arranging in this manner, the short fibers dispersed in the substantially vertical direction by the third screen 14 can be easily dispersed in the substantially horizontal direction by the air jet from the auxiliary air jet part 19, and the short fibers can be dispersed more uniformly. It can be widely distributed.

The fourth sieve 15 (the first fiber-dispersed portion arranged on the most vertically lower side among the plurality of first fiber-dispersed portions) is dispersed by the first to third sieves 12, 13, and 14 and is One batch of short fibers extruded into the chute 11 is dispersed substantially vertically in the hollow portion 11d.

The fourth sieve 15 is arranged such that the tip of the fourth dispersed portion 15a (vertically dispersed portion) is positioned near the auxiliary air injection portion 19 arranged near the boundary between the first portion and the second portion of the main body portion 11c. , is placed in the second portion. With such an arrangement, the short fibers can be dispersed more uniformly over a wide range, as in the case of the third sieve 14 .

The second to fourth sieves 13, 14, 15 all have the same specifications (see FIG. 4), and the tips of the second to fourth distributed parts 13a, 14a, 15a are oriented substantially in the same direction. placed to face. In addition to the third sieve 14 and the fourth sieve, one or a plurality of sieves having the same specifications as these may be arranged in the body portion 11c. Alternatively, only one of the third sieve 14 and the fourth sieve 15 may be arranged on the body portion 11c.

Furthermore, the first sieve 12 is not an essential component of the fiber feeding mechanism 1, and the first sieve 12 may not be arranged in the fiber feeding mechanism 1. However, from the viewpoint of dispersing the short fibers as uniformly and widely as possible in the hollow portion 11d, and from the viewpoint of quickly dispersing the short fibers and stably supplying them to the kneading mechanism 20, the second to fourth sieves 13, 14, 15 Additionally, a first sieve 12 is preferably arranged in the fiber feeding mechanism 1 .

The extruder 16 extrudes one batch of short fibers dispersed by the first to third sieves 12 to 14 into the chute 11 . The extrusion device 16 has a first portion of the body portion 11c where the vibrating portion 18 (of the two vibrating portions 18, which is arranged on the vertically lower side) and the auxiliary air injection portion 19 (the second (arranged in the vicinity of the boundary between the first part and the second part). In addition, the extrusion device 16 is arranged at a position facing the fourth sieve 15 in the first portion of the main body portion 11c.

With such an arrangement, the short fibers extruded into the chute 11 by the extrusion device 16 easily fall over the entire fourth dispersion portion 15a of the fourth sieve 15, and the short fibers are dispersed by the fourth sieve 15. Dispersion can be done effectively.

The air blower 17 horizontally jets air toward the short fibers that are guided by the chute 11 and dropped into the inside 20 b of the kneading mechanism 20 . Also, the air blower 17 is arranged on the inspection door 20 a of the kneading mechanism 20 . The air blower 17 is not an essential component of the fiber feeding mechanism 1, and the air blower 17 may not be arranged in the fiber feeding mechanism 1. However, from the viewpoint of uniformly dispersing the short fibers inside the kneading mechanism 20, it is preferable that the air blower 17 is arranged in the fiber supply mechanism 1. FIG.

The vibrating units 18 vibrate the chute 11, and are attached to portions of the chute main body 11c corresponding to the arrangement positions of both ends of the slit 11e.

The auxiliary air injection unit 19 injects air horizontally toward the dropped short fibers. In addition to the two locations described above, the auxiliary air injection units 19 are also arranged at the second portion of the main body 11c, for a total of three. Further, these three auxiliary air injection portions 19 are arranged such that the respective air holes all face substantially the same direction. Further, the auxiliary air injection unit 19 performs intermittent injection by timer control, and injects air at an air pressure of 1 kg/cm ² to 3 kg/cm ² .

The partition plate 1a is installed at the second portion of the main body portion 11c of the chute 11. When the fiber feeding mechanism 1 is not operated, the tip of the partition plate 1a is brought into contact with the inner surface 11f of the second portion and the chute 11 is closed. and the kneading mechanism 20 are separated. This prevents the unnecessary supply of short fibers to the kneading mechanism 20 and the entry of dust and other foreign matter into the kneading mechanism 20 . On the other hand, when the fiber supply mechanism 1 is operated, the partition plate 1a is removed to bring the chute 11 and the kneading mechanism 20 into communication.

<Structure of first to fourth sieves>
Next, the structures of the first to fourth sieves 12, 13, 14, 15 will be described with reference to FIGS. 3 and 4. FIG. 3(a) is a top view showing a schematic configuration of the first sieve 12, and FIG. 3(b) is a side view showing a schematic configuration of the first sieve 12. FIG. Also, FIG. 4(a) is a side view showing a schematic configuration of the second to fourth sieves 13, 14, 15, and FIG. is a top view showing a schematic configuration of.

As shown in FIGS. 3(a) and 3(b), the first sieve 12 includes a first dispersed portion holding portion 12a, a first dispersed portion 12b, a first fulcrum 12c and a first driving portion (not shown). ing. The first dispersing portion 12b is a U-shaped and thin plate-like portion in a plan view, and the short fibers supplied from the weighing machine 10 for each batch are distributed to the first dispersing portion 12b in reciprocating motion in the horizontal direction. The contact disperses the short fibers in the horizontal direction.

The first dispersed portion holding portion 12a is an elongated thin plate-like portion in a plan view, and the width thereof gradually narrows toward the tip on the side where the first dispersed portion 12b is attached. A first fulcrum 12c is attached to the end of the first dispersed portion holding portion 12a opposite to the side on which the first dispersed portion 12b is attached. The first distributed portion holding portion 12a is fixed to the chute 11 by the first fulcrum 12c so as to reciprocate in the horizontal direction.

Further, the first distributed portion holding portion 12a is horizontally reciprocated by the first driving portion. Specifically, as shown in FIG. 3A, the first distributed portion holding portion 12a moves from the reference position Lo before the reciprocating motion to the first limit position L1 to the second limit position around the first fulcrum 12c. It reciprocates between positions L2. That is, the first distributed portion holding portion 12a repeats rotation of a rotation angle of 30 degrees about the first fulcrum 12c. Here, the first limit position L1 and the second limit position L2 have a symmetrical positional relationship with respect to the reference position Lo.

The shape and size of the first dispersed portion holding portion 12a and the first dispersed portion 12b are not limited to those described above, and may be changed in design as appropriate. Also, the rotation angle and the like of the first distributed portion holding portion 12a may be adjusted as appropriate.

Next, as shown in FIGS. 4(a) and 4(b), the second sieve 13 includes a second dispersed portion 13a, a second driving portion 13b, a second dispersed portion holding portion 13c, a second fulcrum 13d and a second sieve 13. 2 connection part 13e is provided. The third sieve 14 also has a third distributed portion 14a, a third driving portion 14b, a third distributed portion holding portion 14c, a third fulcrum 14d and a third connecting portion 14e. Further, the fourth sieve 15 has a fourth distributed portion 15a, a fourth drive portion 15b, a fourth distributed portion holding portion 15c, a fourth fulcrum 15d and a fourth connection 15e.

Here, the structures of the second to fourth sieves 13 to 15 are all the same. Therefore, only the second dispersed portion 13a, the second driving portion 13b, the second dispersed portion holding portion 13c, the second fulcrum 13d and the second connecting portion 13e will be described below.

The second dispersed portion 13a is an elongated thin plate-like portion when viewed from the side, and the width thereof gradually narrows toward the tip. The short fibers dispersed in the substantially horizontal direction by the first sieve fall and contact the second scattering portion 13a reciprocating in the vertical direction, whereby the short fibers are dispersed in the substantially vertical direction.

The second distributed portion 13a is formed continuously with a second connection portion 13e that is similarly thin. The second connecting portion 13e is held by the second dispersed portion holding portion 13c by means of the second fulcrum 13d so as to be able to reciprocate in the vertical direction. Further, the second distributed portion 13a is reciprocated in the vertical direction by the second driving portion 13b. Further, the second sieve 13 is fixed to the chute 11 by fixing the second distributed portion holding portion 13 c to the chute 11 .

Further, as shown in FIG. 4B, a plurality of second dispersion portions 13a are provided in the horizontal direction, and are designed so that the short fibers are effectively dispersed in the substantially vertical direction. The number of second distributed portions 13a, the interval between two adjacent second distributed portions 13a, and the like may be changed in design as appropriate.

<Structure of Extruder>
Next, referring to FIG. 5, the structure of the extrusion device 16 will be described. FIG. 5(a) is a top view showing a schematic configuration of the extrusion device 16. FIG. (b) of FIG. 5 is a side view showing a schematic configuration of the extrusion device 16 .

As shown in FIGS. 5(a) and 5(b), the extrusion device 16 has a push rod type first extrusion portion 16a and a second push rod type extrusion portion 16b, each of which is formed in a hollow portion of the chute 11 by a cylinder method and timer control. Extrude into 11d.

Here, two first extruded portions 16a are provided so as to sandwich the second extruded portion 16b in plan view. The tip of the first extruded portion 16a is bent vertically downward, and the tip of the second extruded portion 16b is bent vertically upward. By setting the number and shape of the first extruded portion 16a and the second extruded portion 16b as described above, the extruding device 16 effectively extrudes the short fibers.

The number, shape, etc. of the first extruded portion 16a and the second extruded portion 16b are not limited to those described above, and may be appropriately changed in design.

<Air blow structure>
Next, referring to FIG. 6, the structure of the air blower 17 will be described. (a) to (c) of FIG. 6 are schematic diagrams showing the structure of part of the air blower 17 and the kneading mechanism 20. FIG.

As shown in FIG. 6(a), the air blower 17 is an L-shaped air injection pipe in plan view. In addition, an injection nozzle (not shown) is formed at an injection portion of the air blower 17 disposed substantially parallel to the inspection door 20a in the interior 20b of the kneading mechanism 20. As shown in FIG.

Specifically, 14 injection nozzles are formed substantially along the pipe axis direction of the injection portion on the surface facing the center of the kneading mechanism 20 at the injection portion. The injection nozzle has a hole of φ2, and the interval between two injection nozzles adjacent to each other is constant at 30 mm. Then, from this injection nozzle, air with an air pressure of 2 kg/cm ² to 6 kg/cm ² is continuously injected in the horizontal direction. Here, the dispersion effect of the air blower 17 is most exhibited when the air pressure is approximately 4 kg/cm ² .

The number, size, and pitch of the injection nozzles may be appropriately changed in design according to the model of the kneading mechanism 20 and the like. Also, the air pressure of the air jetted from the air blower 17 may be appropriately changed according to the size of the inside 20b of the kneading mechanism 20 and the like. Furthermore, the injection of air to the short fibers using the air blower 17 is only an example, and any device that can inject air horizontally toward the short fibers that have fallen into the interior 20b of the kneading mechanism 20 can be used. Instruments may be used.

Further, as shown in FIG. 6B, the air blower 17 is arranged at the vertically upper second end 20a-1 of the inspection door 20a of the kneading mechanism 20. As shown in FIG. Here, the inspection door 20a is provided in the kneading mechanism 20 so as to be able to be opened and closed in order to inspect the inside of the kneading mechanism 20. As shown in FIG. When the concrete kneading device 100 is in operation, the inspection door 20a is closed to close the inspection opening 20c formed in the side wall of the kneading mechanism 20. As shown in FIG.

It should be noted that the air blower 17 does not necessarily need to be arranged on the inspection door 20a. For example, as shown in FIG. 6(c), an air blower 17 is arranged at a location near the inspection door 20a on the vertical upper wall of the kneading mechanism 20, or at a location near the inspection door 20a on the bottom wall of the kneading mechanism 20. may Furthermore, an air blower 17 may be arranged on the side wall of the kneading mechanism 20 near the inspection door 20a. In other words, the air blower 17 may be arranged in the kneading mechanism 20 near the inspection door 20a.

<Additional notes>
The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention.

1: Fiber supply mechanism (supply mechanism) 11: Chute 11g: Input port 12: First sieve (second fiber dispersion part) 12b: First dispersion part (horizontal dispersion part)
13: Second screen (first fiber dispersion part) 13a: Second dispersion part (vertical dispersion part)
14: Third sieve (first fiber dispersion part) 14a: Third dispersion part (vertical dispersion part)
15: Fourth sieve (first fiber dispersion part) 15a: Fourth dispersion part (vertical dispersion part)
16: Extruder 17: Air blow (air injection part) 20: Kneading mechanism 20a: Inspection door 20b: Inside 20c: Inspection opening 100: Concrete kneading device

Claims (5)

A supply mechanism for supplying fibers, which are constituent materials of fiber-reinforced concrete, to a kneading mechanism for kneading the fibers and other constituent materials in a concrete kneading device,
a chute for guiding the fibers from the inlet to the kneading mechanism;
at least one first fiber distribution section having a vertical distribution portion that reciprocates vertically within the chute;
a second fiber dispersing section having a horizontal dispersing portion that reciprocates horizontally within the chute;
an auxiliary air injection unit that injects air horizontally toward the fibers,
The second fiber dispersion portion is arranged vertically above the first fiber dispersion portion,
The vertically distributed portion is an elongated thin plate-like portion when viewed in the horizontal direction , and the width in the vertical direction gradually narrows toward the tip of the vertically dispersed portion ,
the tip of the vertical dispersion portion is positioned near the auxiliary air injection portion;
The supply mechanism is characterized in that the horizontally distributed portion is a thin plate-shaped portion that is U-shaped when viewed in the vertical direction . an extrusion device that includes a plurality of the first fiber dispersion units and that extrudes the fibers into the chute,
2. The extruding device according to claim 1, wherein the extrusion device is arranged vertically above the first fiber dispersion section which is arranged on the most vertically lower side among the plurality of first fiber dispersion sections. supply mechanism. 3. The supply mechanism according to claim 1, further comprising an air injection section for injecting air toward the fibers that have fallen into the inside of the kneading mechanism through the chute. 4. The air injection unit according to claim 3, wherein the inspection door is openable and closable in the kneading mechanism for inspection of the inside of the kneading mechanism, or is arranged in the vicinity of the inspection door. supply mechanism. 5. A kneading mechanism for kneading fibers constituting fiber-reinforced concrete and other constituent materials, and a supply mechanism according to any one of claims 1 to 4 for supplying the fibers to the kneading mechanism. A concrete kneading device characterized by:

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