JPH04189104A - Continuous kneading method of slurry mixed with fiber material - Google Patents

Abstract

PURPOSE:To secure sufficient kneading and smooth sending out of slurry by improving dispersibility of a fiber material, by a method wherein premix is performed by mixing the fiber material into a powder material obtained by performing dry mixing of only a cement powder material, then the same is kneaded continuously and the subject slurry is manufactured. CONSTITUTION:Only cement powder material is loaded into a Nauta mixer and a powder kneading process performing dry mixing of the same is performed. Then after the powder material is kneaded completely with the Nauta mixer 10, a fiber material such as reinforcing fiber is loaded into the Nauta mixer 10 and a prefibrillating process performing premixing of the premixed powder and fiber material is performed. Then a material obtained by performing premixing of the powder material and fiber material in the prefibrillating process is fed to a blade type pin mixer 12 through a belt conveyor 58 and hopper 60. The material is kneaded along with various aqueous solution and a foaming agent at need by the blade type pin mixer 12 and performs a continuous kneading process sending out continuously slurry mixed with the fiber material through a slurry discharge port finally.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to the production of slurry containing fiber material for continuously producing slurry containing fiber material by mixing fiber materials such as reinforcing fibers into cement-based materials. Concerning a continuous kneading method.

(Prior Art) Conventionally, slurry mainly made of cement has been mixed using a blade-type hatch type mixer, such as a concrete mixer.

Incidentally, in recent years, with the shift to dry construction methods, the number of cement-based construction materials produced in factories has increased, and various continuous kneading mixers have been developed to cope with this situation.

For example, wheel type, ball type, blade type, etc. are known as continuous kneading mixers for producing this type of cement slurry. Wheel type types include Multimul, Speed Malawar Mix, etc., and ball type types include: There are vibrating mill mixers, etc., and as blade types,
Auger, paddle mixer, mix mask, pin mixer,
There are turbulizers etc.

(Problem to be solved by the invention) However, when continuously kneading slurry using such a conventional continuous kneading mixer, if fibrous materials such as reinforcing fibers are mixed into the mixed wire material to increase the strength of cement-based building materials, There was a problem in that this fiber material could get tangled with the paddle of the mixer.

If the fibers become entangled in this way, the slurry cannot be sent out smoothly from the mixer, and the fibers may not be fully defibrated.
There was a problem that it became impossible to perform appropriate kneading work. Therefore, in the current production of fiber material-mixed slurry, continuous kneading is not adopted, and a special hatch-type mixer such as an omni mixer is generally used.

On the other hand, as a result of intensive research on the continuous kneading method of slurry containing fiber materials, the present inventor found that in the case of strands of short fiber materials, by kneading these fiber materials in a powder material, the fiber materials can be mixed together. It was discovered that shearing force acts on the fibers, making them easier to defibrate.

The present invention makes it possible to reliably defibrate the fibrous material when producing a slurry mixed with fibrous materials such as reinforcing fibers,
It is an object of the present invention to provide a method for continuously kneading a slurry mixed with a fiber material, which can continuously and smoothly send out the slurry and realize continuous kneading of the slurry mixed with a fiber material.

(Means for Solving the Problems) In order to achieve this object, the present invention first trimixes only a cement powder material, and then mixes a fibrous material into the dry mix powder material. The present invention is characterized in that these are premixed, and then the premixed fiber material-containing powder material is continuously kneaded to produce a fiber material-containing slurry.

(Function) The method of the present invention described above includes a step of dry-mixing only cement-based powder material, a step of mixing fiber material into the dry-mixed powder material and premixing them, It consists of a step of continuously kneading the premixed powder material mixed with fiber material, and the premixing step consists of the following steps:
By mixing the fibrous material into the trimixed powder material, the defibration of the fibrous material is significantly promoted by the above-mentioned shearing force acting on the fibrous materials.

By performing cross-crossing after the fibers are fully defibrated in this way, the fibers do not get tangled with paddles, etc., and the dispersibility of the fibers improves, resulting in sufficient cross-crossing and smooth slurry delivery. can be ensured, and a continuous kneading method can be appropriately introduced in the production of fiber material-mixed slurry.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

That is, FIG. 1 shows an embodiment of the continuous kneading method of the fiber material-mixed slurry according to the present invention, and 10 in the figure shows the step of dry-mixing only the cement-based powder material and the dry-mixed powder. 12 is a blade-type mixer that performs the process of mixing fiber materials into body materials and premixing them; 12 is a blade type that performs the process of continuously kneading the premixed powder material containing fiber materials to produce a slurry containing fiber materials; The Nauta mixer 1o and the blade-type pin mixer 12 constitute a continuous kneading device 14.

As shown in detail in FIG. 2, the Nauta mixer 10 includes a cone-shaped hopper 16 whose diameter is reduced from below.
The lid 16a that closes the upper end of the hopper 6 is provided with an inlet 14, and the lower end of the hopper 6 is provided with an outlet 8.

A screw 20 is provided inside the hopper 6 parallel to the inclined inner wall surface of the hopper 16. The upper end of this screw 20 is connected to the tip f4 of a swing arm 22 extending in the radial direction of a hopper]6 rotatably attached to the center of the lid 16a. M is rotatably supported, and the lower end of the screw 20 is rotatably supported by the lower end of the hopper 16 via a universal joint 24.

A motor 26 and a gear box 2 are provided on the upper side of the lid 16a.
8 is provided, and the rotation of the motor 26 decelerated by the gearbox 28 is transmitted to the swing arm 22 and also to the screw 20 via a rotation transmission mechanism disposed within the swing arm 22.

When the motor 26 is driven, the swing arm 22
rotates along a plane parallel to the lid body 16a, and the screw 20 rotates along a plane parallel to the lid body 16a.
While being rotated in the circumferential direction within the hopper 16, the screw 20 itself is rotated around its own central axis.

In other words, the screw 20 rotates about its own rotation axis and revolves along the inner wall surface of the hopper 16 by the swing arm 22 and the universal joint 24, and the material supplied into the hopper 16 by the movement of the screw 20. or kneaded.

On the other hand, the blade type pin mixer] 2 is shown in the plan view of FIG.
As shown in the cross-sectional front view of FIG. 4, a rotor 32 rotationally driven by a drive shaft 30, a blade 34 attached to the outer periphery of the rotor 32, and a casing that rotatably houses the rotor 32 and blades 34. 36
It is roughly composed of:

The rotor 32 is formed of an annular plate arranged horizontally, and blades 34 are provided on the outer peripheral edge of the rotor 32.
A plurality of blade plates 34a constituting the blade plate are fixedly arranged in a radial manner.

The casing 36 has a cylindrical outer circumferential wall 36a and a top that closes the upper and lower ends of the outer circumferential wall 36a, respectively.

It is composed of lower lid bodies 36b and 36c, and an upper lid body 36b.
As shown by the two-dot chain line in FIG.
In addition, an aqueous solution supply port 40 and a foaming agent supply port 42 are respectively formed, and the lower lid body 36c is located at the outer peripheral edge of the plate 34, that is, on the outer peripheral wall 36a side of the casing 36, as shown by the broken line. A slurry discharge port 44 is formed.

Further, on the upper surface of the blade plate 34a, a plurality of blades (
In this embodiment, three (3) movable pins 46 are implanted toward the upper lid body 36b.

On the other hand, on the lower surface of the upper lid body 36b, a plurality of fixing bins 48 (two in this embodiment) are similarly arranged in the circumferential direction at a plurality of locations (in this embodiment, four locations) in the radial direction. 34
It is planted towards a. And these movable pins 4
6 and the fixed pin 48 are arranged so that the fixed pin 48 is positioned between the movable pins 46 so as not to interfere with each other in the radial direction.

The lower lid body 36c of the casing 36 is placed on an elevating frame 54 that is raised and lowered along a guide rod 52 erected from a base 50, and is mounted on an elevating frame 54 that is moved up and down by a geared motor 56 with a brake.
It is designed to be driven up and down along with the lifting frame I and - 54 which is driven up and down by.

By the way, the continuous kneading apparatus shown in FIG. The material conveyed by the conveyor 58 is first collected in a hopper 60, and then continuously supplied to the blade-type pin mixer 12 from this hopper 6o.

Here, in the continuous kneading method of the fiber material-mixed slurry of this embodiment using the continuous kneading device 14, first, only the cement-based powder material is charged into the Nauta mixer 10, and this is mixed into powder to be trimixed. Perform the kneading process.

Next, after the powder material is completely kneaded in the Nauta mixer 10, fibrous materials such as reinforcing fibers are introduced into the Nauta mixer 10, and a blur defibration process is performed in which the trimixed powder and the fibrous material are premixed. conduct.

The premixed materials such as powder material and fiber material in the blur defibration process are transferred to a belt conveyor 58 and a hopper 6.
0 to the blade-type pin mixer 12, where it is kneaded with various aqueous solutions and, if necessary, a foaming agent, and finally a continuous slurry containing fiber material is continuously sent out from the slurry discharge port. Perform the kneading process.

In the continuous kneading method of this embodiment in which the fiber material-mixed slurry is produced through the above-mentioned steps, the powder material can be sufficiently dry mixed by performing the powder kneading step using the Nauta mixer 10.

Then, a fiber material is mixed into the powder material thus trimixed, and a blur defibration process is performed. On this occasion,
When these powder materials and fibrous materials are mixed, shearing force acts between the fibrous materials, promoting mutual fibrillation of the fibrous materials, and also ensuring sufficient dispersion of the fibrous materials into the powder material. be exposed.

Then, the powder material mixed with the fiber material is supplied to the next blade-type pin mixer 12, where a continuous kneading process is performed in the plate-type pin mixer 12, and continuous kneading of the fiber material-mixed slurry is performed.

Therefore, before the continuous kneading process, the fibrous material mixed into the material is sufficiently defibrated and dispersed in the powder material in the pre-defibration process. This eliminates the possibility of entanglement with mechanical parts, etc., and ensures sufficient cross-mixing and smooth delivery of the slurry, making it possible to appropriately introduce a continuous kneading method in the production of fiber material-containing slurry.

In addition, in the pre-defibration process, only the powder material is sufficiently dry mixed in the powder kneading process, and then the fiber material is mixed in and defibrated, thereby preventing the problem of the fiber material being kneaded more than necessary. be able to.

Note that as the fiber material, any organic or inorganic short fibers can be used, except for metal fibers such as steel fibers.

In addition, the continuous kneading device 14 used in the continuous kneading method of this embodiment is not limited to the Nauta mixer 10 in the powder kneading process and the pre-defibration process, but is not limited to this, for example, a blade type ribbon mixer, Multimix 1 A spiral mixer, base master, portex mixer, Eirich mill, etc. can be used.

(Effects of the Invention) As explained above, in the continuous kneading method of the fiber material mixed slurry of the present invention, there is a step of dry mixing only the cement powder material, and a step of dry mixing only the cement powder material, and a step of dry mixing only the cement powder material, and a step of dry mixing only the cement powder material. A process of premixing these by mixing materials,
It consists of a process of continuously kneading the premixed fibrous material Ronin powder material, and in the premixing process, the fibrous material is mixed into the dry mixed powder material, so that the fibrous material does not mix with each other. Defibration of the fiber material can be significantly promoted by the shear force acting on the fiber material.

In this way, continuous mixing is performed after the fibers are fully defibrated, so the fibers do not get tangled with paddles, etc., and the dispersibility of the fibers is improved, resulting in sufficient kneading and smooth kneading. The delivery of the slurry can be ensured, and a continuous cross-talk system can be appropriately introduced in the production of fiber material-mixed slurry.

[Brief explanation of the drawing]

Fig. 1 is an overall view of an apparatus used in an embodiment of the continuous kneading method for a slurry mixed with fiber materials according to the present invention, and Fig. 2 is an illustration of an apparatus used in the powder kneading process and pre-fibrillation process of the present invention. FIG. 3 is an enlarged sectional view showing an embodiment, FIG. 3 is a plan view showing an embodiment of the apparatus used in the continuous kneading process of the present invention, and FIG.
The figure is a cross-sectional front view of the apparatus shown in FIG. 3. 10... Nauta mixer 12... Blade type pin mixer 14... Continuous kneading device Fig. 1

Claims (1)

[Claims] First, only the cement powder material is dry mixed, then the fiber material is mixed into the dry mixed powder material and premixed, and then the premixed powder material containing the fiber material is continuously kneaded. 1. A continuous kneading method for a fiber material-mixed slurry, characterized in that the fiber material-mixed slurry is produced by