JPS6038975B2 - Short fiber dispersion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for dispersing short steel fibers or other short fibers that are intertwined into a lump.

In recent years, composite materials that are reinforced by mixing steel or glass fiber into a matrix of concrete, plastic, etc. have attracted attention and have reached the stage of practical application.

For example, by mixing about 1 to 3% by volume of short steel fibers into a concrete matrix, strength, plowability, and durability can be significantly improved. These short fibers are usually very small, measuring 0.1 to 1.0 × height 0.1 to 1.0 × length 10 to 4, and are uniformly spread over the base matrix. The above-mentioned effect can only be achieved when it is dispersed. In addition, these short fibers have a length to cross-sectional diameter ratio (referred to as aspect ratio) of approximately 30 to 100.
Because of its large size, it is very easy to get tangled, so when producing steel fiber reinforced concrete, a short steel fiber dispersion device is usually installed on the mixer to stabilize quality and improve efficiency. Conventionally, as a short fiber dispersion device for short steel fibers, '1
}Mesh rotary short fiber dispersion device A configured to supply short steel fiber lumps into a horizontal rotating cylinder made of expanded metal, and to disperse and drop the short steel fibers through the mesh of the rotating cylinder. 2} Squared drum rocking type short fiber dispersion device B configured to repeatedly rotate a squared drum in forward and reverse directions in an outer case so as to disperse and drop steel short fibers from between the outer case and the squared drum. , '3} 2 Comb-up and down short fiber dispersion device C configured to disperse and drop copper short fibers by vertically moving a lotus-shaped comb alternately; '4' Fixed to a rotating vertical shaft inside an outer box. A centrifugal force type short fiber dispersing device ○ is known, which is configured so that the short steel fibers are thrown away and dispersed and dropped from a delivery guide on the side of the outer case by the centrifugal force generated by the high-speed rotation of the inverter.

However, in the case of the mesh rotating type short fiber dispersing device of '1' above, since the short fiber mass is fed from the side into the horizontal rotating cylinder, at least two operators are required to constantly feed the short fiber mass, which requires manual labor. There is a problem that the uniformity of dispersion is poor because a large amount of short fibers are applied, and the density of falling short fibers increases as the short fibers get closer to the entry side and the bottom of the cylinder.

In addition, in the case of [2-] squared drum rocking short fiber dispersion rack, it is heavy and cannot be transported by hand, and the short fiber lumps form a hanging rack, so stirring is required from time to time. Moreover, since the gap between the outer case and the side of the drum is large, there is a tendency for the product to fall unevenly, and there is also a risk that it may fall in chunks.

Furthermore, in the case of the above-mentioned (3) above-mentioned comb type short fiber dispersion device,
Due to its heavy weight, it is impossible to transport it manually, and it is necessary to perform some stirring work to ensure uniformity of the falling position, and there is a concern that it may fall in chunks. Furthermore, in the case of the centrifugal short fiber dispersion device described in {4-- above, it is impossible to transport it manually due to its large weight.
In addition, it is necessary to start and brake the equipment in the absence of short fiber lumps, making it complicated to check the presence of short fibers during startup and braking.Furthermore, the short fiber lumps are placed at a high input position, which reduces work efficiency. Moreover, since the short fibers travel a long distance in the horizontal direction, there are problems such as the need to provide a stopper at a predetermined position.

On the other hand, if the supply chamber of the short fiber dispersion device is expanded upward, the short fiber mass tends to cause an arch phenomenon and stagnate in the supply chamber, and therefore it is necessary to constantly break the arch phenomenon manually. Therefore, it requires a lot of effort.

An object of the present invention is to provide a short fiber dispersion device that advantageously solves the above-mentioned problems. A silk-like body 2 is provided at the lower part of the supply chamber 1 and slopes downward from the peripheral wall toward the center, and a rotary vertical shaft 3 provided at the center of the supply chamber 1 has a At the top of the silk material 2, an inberra 4 having a lower slope parallel to the inclination of the silk material 2 is attached, and the lower end of the short fiber mass input port 5 is integrally installed at the upper end of the supply chamber i. The short fiber dispersion device is characterized by:

Next, the present invention will be explained in detail using illustrated examples.

FIG. 1 shows a short fiber dispersion device according to an embodiment of the present invention, in which a short fiber inlet 5 is provided at the upper end of a vertical supply chamber 1 with a circular cross section that expands from above to below. The lower end of the supply chamber 1 is integrally formed with a leg 6.
are integrally installed to form the outer box 7, and the supply chamber 1
A rotating vertical shaft 3 is arranged at the center of the inner part.

The rotating longitudinal shaft 3 is rotatably supported by an upper bearing 8 and a lower gear box 9, and the upper bearing 8 and lower gear box 9 are fixed to the outer case 7 via a plurality of arms 10 and 11 arranged radially. has been done. In the lower part of the supply chamber 1,
The outer periphery of the vice principal's conical mesh body 2, which is tilted downward from the peripheral wall of the supply V supply chamber 1 toward the center, is fixed, and the inner peripheral edge of the mesh body 2 is attached to the upper part of the lower gear box 9. It is fixed to the periphery, and furthermore, the rotating vertical shaft 3 has a downward slope parallel to the forehead slope of the silk-like body 2 slightly above the net-like body 2, and has a twist angle that gives a downward thrust. A plurality of invera-4 are fixed.

The driven bevel gear 12 fixed to the lower part of the rotating vertical shaft 3 and the driving bevel gear 14 fixed to the drive shaft 13 are the lower gear box 9
The drive shaft 13 is configured to be rotated by the motor 15 via the transmission 16, and the motor 15
When the inveterer 4 is rotated in the direction of the arrow through the transmission 16 and zero gear transmission mechanism, a downward thrust is applied to the short fibers scraped off by the isoveler 4.

When the inveler 4 in the short fiber dispersion device shown in FIG. The steel short fibers at the bottom are continuously scraped off by the invera 4, and the scraped steel short fibers are subjected to downward thrust, rotational force around the rotational vertical axis 3, centrifugal force, etc. by the rotating invera 4. After being uniformly dispersed over almost the entire surface of the silk-like body 2, the particles fall through the net-like body 2 and are almost uniformly dispersed.

FIG. 2 shows a comparative example of the processing capacity of the short fiber dispersion apparatuses A to D of the related art and the short fiber dispersion apparatus of the present invention. It can be seen that the processing capacity of the apparatus increases proportionally as the number of rotations increases, and that the apparatus has a much larger processing capacity than conventional short fiber dispersion apparatuses.

0 On the other hand, short fibers with an aspect ratio of about 30 or more tend to get entangled with each other, and if the mesh size of the mesh body 2 is, for example, a square with a short fiber length of about 1 x 1.5 or less, , it is difficult for the short fibers to easily pass through the silk-like body 2 without applying an external force.

Strictly speaking, there are some short fibers that pass through the net-like body 2 at the moment when the external force is removed, but they can be completely ignored in terms of measurement errors. In this way, the short fibers sandwiched between the invera 4 and the silk-like body 2 are restrained without falling between the invera 4 and the silk-like body 2 when the invera 4 stops, so that the short fibers are held between the invera 4 and the silk-like body 2 without falling. By controlling starting and braking, the amount of distributed fall can be easily estimated with high accuracy.

Furthermore, since the silk body 2 has a conical shape that slopes downward from the peripheral wall of the supply chamber 1 toward the center, the short fibers are dispersed radially by the rotation of the inflator 4, and the short fibers are dispersed in the matrix in the mixer. When reaching the upper surface of the matrix, the short fiber deposition rate per unit area is small, making it possible to significantly improve the dispersion ability while avoiding balling of the short fibers within the matrix.

Figure 3 shows the difference between the dispersion state of the conventional short fiber dispersion device and the dispersion state of the short fiber dispersion device of the present invention, and shows that the dispersion state of the present invention is significantly better than that of the conventional case. It can be seen that it is.

When carrying out this invention, expanded metal, a wire mesh, a metal plate provided with a large number of slits or through holes adjacent to each other, etc. can be used as the mesh body 2.

In the embodiment described above, the twisting angle is set to the winding roller 4 to give a downward thrust, but if the rotational speed of the rolling winder 4 is relatively low, the twisting angle in the opposite direction or twisting angle may be set to the swinging angle in the opposite direction. It is not necessary, and the twist angle has no important meaning.

In addition, in the case of the short fiber dispersing device of the present invention, since the short fiber lumps tend to rotate together with the inverter, a protrusion is fixed to the inner wall surface of the supply chamber 1, and the rotation of the short fiber lumps is restrained by the protrusion. However, it is preferable that the short fibers be sequentially scraped off from the bottom of the short fiber mass by a rotating inflator and dispersed.

When, for example, short steel fibers are to be dispersed and dropped using the short fiber dispersion device of the present invention, the short fiber lumps are simply unpacked and fed from the short fiber lump inlet at the top of the short fiber dispersion device as in the conventional method. Because it can perform its functions, it is more labor-saving than traditional equipment.

In addition, if a belt conveyor is connected to the short fiber mass input port and the belt conveyor supplies the short fiber soul from the short fiber mass input port, complete automation can be easily achieved, and when manufacturing fiber-reinforced composite materials. It is possible to completely solve short fiber dispersion, which was the biggest problem in the past. According to this invention, the net-like body 2 is provided in the lower part of the supply chamber 1 which is expanding from the top to the bottom, and is inclined downward from the peripheral wall of the supply chamber 1 toward the center. Moreover, an invera 4 having an oblique lower green parallel to the inclination of the silk-like body 2 at the upper part of the net-like body 2 is attached to the rotating vertical shaft 3 provided in the center of the supply chamber 1, and the short fibers are Since the lower end of the lump inlet 5 is integrally connected to the upper end of the supply chamber 1, the short fiber lumps can be simply fed into the supply chamber 1 from the short fiber lump inlet 5, and by the rotation of the inverter 4, By forcibly scraping and dispersing the short fibers from the lower part of the short fiber mass in the supply chamber 1 at high speed, the short fibers can be dispersed and fallen from the silk material 2 with high efficiency and uniformly, and the short fibers can be further supplied. Since the chamber 1 expands from the top to the bottom, that is, it expands downward, the short fiber mass does not arch and become stagnant in the supply chamber 1, and the short fiber mass is transported as a whole by its own weight. Therefore, there is no need for human intervention to break the arching phenomenon, and the short fiber mass is simply transferred to the supply chamber 1.
Since it is only necessary to supply the liquid from above, manual work can be reduced, and the apparatus of the present invention has advantages such as having a simple structure and being lightweight.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially longitudinal side view showing a short fiber dispersion device according to an embodiment of the present invention, FIG. 2 is a view showing dispersion ability, and FIG. 3 is a view showing short fiber deposition speed. It is.

In the figure, 1 is a supply chamber, 2 is a mesh body, 3 is a rotating vertical axis,
4 is an inverter, 5 is a short fiber mass input port, 7 is an outer case, 9 is a lower gear, 13 is a drive shaft, 15 is a motor, and 16 is a transmission. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A net-like body 2 is provided at the lower part of the supply chamber 1, which is expanding from above to below, and slopes downward from the peripheral wall of the supply chamber 1 toward the center, and the inside of the supply chamber 1 is The mesh body 2 is attached to the rotating vertical shaft 3 provided in the center of the
An impeller 4 having an inclined lower edge parallel to the inclination of the net-like body 2 is attached to the upper part of the net-like body 2, and the lower end of the short fiber mass input port 5 is integrally connected to the upper end of the supply chamber 1. Short fiber dispersion equipment.