JPH11221820A - Concrete mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a highly fluid concrete in a short time by kneading a concrete material difficult to be kneaded between a first mixing blade and a second mixing blade by a method wherein a second auxiliary mixing tool is rotated between the first mixing blade and the second mixing blade. SOLUTION: A mixing tank has a cylindrical inner surface in a bottom part. A shaft 3 is provided in the mixing tank 2, and rotated by motive power. A first mixing blade 4 and a second mixing blade 5 are fixed to the shaft 3. A mixing arm 6a is fixed to a middle part of the part 3 to connect the first mixing blade 4 to the second mixing blade 5. An arm part of the first auxiliary mixing tool 7 is fixed to the middle part of the shaft 3, and elongated normally to the shaft 3 and the mixing arm 6. A semi-cylinder part is provided at both ends of the arm part. A cylinder central line of the semi-cylinder part is elongated parallel to a cylinder central line of the inner surface of the cylinder on the arm part. A plurality of second auxiliary tools 8 are fixed to the mixing arm 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete mixer, and more particularly to a mixer suitable for producing high-flow concrete.

[0002]

2. Description of the Related Art A conventional concrete mixer is disclosed, for example, in Japanese Patent Publication No. 3-68805.
That is, a mixing tank having a cylindrical inner surface at the bottom, a shaft provided on the cylindrical center line of the cylindrical inner surface of the mixing tank, rotatable by power, and fixed to the shaft, when located at the bottom side of the mixing tank, the edge is A first mixing blade spirally extending along the inner surface of the cylinder from one end to an intermediate portion of the mixing tank; and a first fixed blade fixed to the shaft and positioned at the bottom side of the mixing tank, the edge is formed from the other end of the mixing tank to the intermediate portion. A second mixing blade extending spirally in a direction opposite to the first mixing blade along the inner surface of the cylinder, and a mixing arm fixed to an intermediate portion of the shaft and connecting the first mixing blade and the second mixing blade. And
The concrete material is put in the mixing tank, and the shaft is rotated to knead the concrete material with the first mixing blade and the second mixing blade.

[0003]

However, in the conventional concrete mixer, when the material is kneaded to produce high-fluidity concrete, ordinary concrete is mixed to knead the material to an optimum state as high-fluidity concrete. There is a problem that it takes several times as long as kneading.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a concrete mixer capable of producing high fluidity concrete in a short time.

[0005]

In order to achieve the above object, a concrete mixer according to the present invention is provided with a mixing tank having a cylindrical inner surface at a bottom, and provided in the mixing tank on a cylindrical center line of the cylindrical inner surface, A shaft that is rotatable by power, and a first mixing that is fixed to the shaft and extends spirally along the inner surface of the cylinder from one end to an intermediate portion of the mixing tank when the mixing tank is located at the bottom side of the mixing tank. A blade, fixed to the shaft, when located at the bottom side of the mixing vessel, the edge spirals in a direction opposite to the first mixing blade along the inner surface of the cylinder from the other end to the middle of the mixing vessel. A concrete mixer having a second mixing blade extending in the axial direction and a mixing arm fixed to an intermediate portion of the shaft and connecting the first mixing blade and the second mixing blade. And a semi-cylindrical portion, wherein the arm portion is fixed to an intermediate portion of the shaft and extends vertically to the shaft and the mixing arm, and the semi-cylindrical portion is provided at both ends of the arm portion, The cylindrical center line of the portion has a first auxiliary mixing device on the arm portion and extending parallel to the cylindrical center line of the inner surface of the cylinder.

In the concrete mixer according to the present invention, when producing concrete, a concrete material is put into a mixing tank, the shaft is rotated, and the concrete material is kneaded between the first mixing blade and the second mixing blade. . At this time, with the rotation of the shaft, the first auxiliary mixing device rotates while crushing the concrete material between the semi-cylindrical portions at both ends of the arm portion and the inner cylindrical surface at the bottom of the mixing tank. Thereby, when kneading the high-fluidity concrete material, especially the powder material is sufficiently kneaded, and the high-fluidity concrete can be kneaded in a short time. The concrete mixer according to the present invention can be used not only for high-fluidity concrete but also for general concrete production.

In the concrete mixer according to the present invention, in the concrete mixer according to claim 1, the mixing arm is fixed to the mixing arm at intervals in the longitudinal direction of the mixing arm through the mixing arm, and is fixed to the inner surface of the cylinder. It is characterized by having a plurality of second auxiliary mixers each extending parallel to the cylindrical center line.

In the concrete mixer according to the present invention, with the rotation of the shaft, the second auxiliary mixer rotates between the first mixing blade and the second mixing blade, and the second auxiliary mixing device rotates between the first mixing blade and the second mixing blade. Knead hard to mix concrete material. Thereby, the effect of kneading the highly fluid concrete in a short time can be enhanced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. As shown in FIGS. 1 to 3, the concrete mixer 1 includes a mixing tank 2, a shaft 3, a first mixing blade 4, a second mixing blade 5, and three mixing arms 6.
a, 6b, 6c, a first auxiliary mixer 7, and a second auxiliary mixer 8. The mixing tank 2 has a cylindrical inner surface 2a at the bottom.
And an inlet (not shown) for the concrete material at the upper part and an outlet (not shown) at the lower part. The shaft 3 is provided on the cylindrical center line 2d of the cylindrical inner surface 2a in the mixing tank 2 by penetrating both end surfaces of the one end 2b and the other end 2c of the mixing tank 2, and a motor (not shown) is provided outside the mixing tank 2. Can be rotated.

When the first mixing blade 4 is fixed to the shaft 3 and is located on the bottom side of the mixing tank 2, the edge 4a extends from one end 2b of the mixing tank 2 to the intermediate portion 2e.
It extends spirally along a. When the second mixing blade 5 is fixed to the shaft 3 and located on the bottom side of the mixing tank 2, the edge 5 a extends from the other end 2 c of the mixing tank 2 to the intermediate section 2 e.
And spirally extends in a direction opposite to the first mixing blade 4 along the cylindrical inner surface 2a. Wear plates 9 are attached to the surfaces of the first mixing blade 4 and the second mixing blade 5.

The three mixing arms 6a, 6b, 6c are fixed to the center of the shaft 3 and to both sides thereof. The central mixing arm 6a penetrates the shaft 3 to connect the first mixing blade 4 and the second mixing blade 5 to each other. The mixing arms 6b and 6c on both sides are connected to the first mixing blade 4 and the second mixing blade 5, respectively.

As shown in FIGS. 2 and 3, the first auxiliary mixer 7 has an arm portion 7a and a semi-cylindrical portion 7b, and the arm portion 7a is fixed to the center of the shaft 3. The first auxiliary mixing tool 7 extends through the shaft 3 and perpendicular to the shaft 3 and the mixing arm 6a. The semi-cylindrical portion 7b
It is provided at both ends of the arm portion 7a. As shown in FIG. 3, the cylindrical center line 7c of the semi-cylindrical portion 7b extends on the arm portion 7a in parallel with the cylindrical center line 2d of the cylindrical inner surface 2a.

The plurality of second auxiliary mixers 8 are each formed of a rod-shaped member having the same length. Each of the second auxiliary mixing tools 8 penetrates the mixing arm 6a, is spaced apart in the longitudinal direction of the mixing arm 6a, and is fixed to the mixing arm 6a at the center. Each second auxiliary mixing tool 8 extends in parallel with the cylindrical center line 2d of the cylindrical inner surface 2a.

Next, the operation will be described. When producing high-flowable concrete with the concrete mixer 1, a high-flowable concrete material is put into the mixing tank 2 from an input port. High fluidity concrete materials consist of cement, water, sand, gravel, powder and superplasticizers. The distribution and order of the inputs of the high-fluidity concrete material are appropriately adjusted.
After the high-fluidity concrete material is charged, the shaft 3
Is rotated to knead the highly fluid concrete material with the first mixing blade 4 and the second mixing blade 5. When kneading the high-fluidity concrete material, the first auxiliary mixing tool 7 extends perpendicularly to the shaft 3 and the mixing arm 6a, and thus compensates for the weak portion of the counterflow mixing area.

As the shaft 3 rotates, the first auxiliary mixing tool 7 crushes the high-fluidity concrete material between the semi-cylindrical portions 7b at both ends of the arm portion 7a and the inner cylindrical surface 2a at the bottom of the mixing tank 2. Rotate. As a result, when kneading a high-fluidity concrete material, the performance effect of the high-performance water reducing agent is exerted, and especially the powder material is sufficiently kneaded. Concrete can be kneaded.

At the same time, in the concrete mixer, with the rotation of the shaft 3, the plurality of second auxiliary mixing tools 8 rotate between the first mixing blade 4 and the second mixing blade 5, and the first mixing blade 4 and the second mixing blade 5 rotate. A highly fluid concrete material that is difficult to knead with the mixing blade 5 is kneaded. The second auxiliary mixing tool 8
Since the inner surface 2a of the cylinder extends parallel to the center line 2d of the cylinder and is fixed to the mixing arm 6a, the weak portion of the mixing region of the counterflow is compensated for and the mixing is performed efficiently. Thereby, the effect of kneading the highly fluid concrete in a short time can be enhanced. Concrete mixers can be used not only for high-fluidity concrete, but also for the production of other types of concrete.

In the above-described embodiment, the case where the concrete mixer is a single-shaft mixer has been described as an example, but it goes without saying that a two-shaft mixer or a pan-type mixer can be adopted as the concrete mixer.

[0018]

According to the concrete mixer of the present invention, the first auxiliary mixer has a semi-cylindrical portion at both ends of the arm portion, so that the first auxiliary mixer has both ends. The semi-cylindrical portion rotates while crushing the concrete material with the inner surface of the cylinder at the bottom of the mixing tank, so that the highly fluid concrete can be kneaded in a short time.

In particular, according to the concrete mixer according to the present invention, there is provided a second auxiliary mixer, and the second auxiliary mixer is fixed at intervals in the longitudinal direction of the mixing arm, and the mixing is performed. Since it extends in parallel with the cylindrical center line of the inner surface of the cylinder at the bottom of the tank, the effect of kneading the hard-to-knead concrete material between the first mixing blade and the second mixing blade and kneading the high-fluid concrete in a short time is obtained. Can be increased.

[0020]

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a concrete mixer according to an embodiment of the present invention.

FIG. 2 is a bottom view of a main part of the concrete mixer of FIG. 1 excluding a mixing tank.

FIG. 3 is a side view of a main part of the concrete mixer of FIG. 1 excluding a mixing tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete mixer 2 Mixing tank 3 Shaft 4 1st mixing blade 5 2nd mixing blade 6a, 6b, 6c Mixing arm 7 1st auxiliary mixing tool 8 2nd auxiliary mixing tool

Claims (2)

[Claims] A mixing tank having a cylindrical inner surface at a bottom portion, a shaft provided on the cylindrical center line of the cylindrical inner surface in the mixing tank, rotatable by power, and fixed to the shaft;
A first mixing blade having an edge spirally extending along the inner surface of the cylinder from one end to an intermediate portion of the mixing tank when the mixing blade is located at a bottom side of the mixing tank; A second mixing blade having an edge extending spirally in the opposite direction to the first mixing blade along the inner surface of the cylinder from the other end of the mixing tank to an intermediate portion, and an intermediate portion of the shaft. Fixed, said first
A concrete mixer having a mixing blade and a mixing arm connecting the second mixing blade, the concrete mixer having an arm portion and a semi-cylindrical portion, wherein the arm portion is fixed to an intermediate portion of the shaft, and the shaft and the mixing member are mixed. Extending vertically to the arm, the semi-cylindrical portion is provided at both ends of the arm portion,
The concrete mixer according to claim 1, wherein a cylindrical center line of the semi-cylindrical portion has a first auxiliary mixing tool on the arm portion and extending in parallel with the cylindrical center line of the inner surface of the cylinder. 2. A plurality of second auxiliary mixings penetrating the mixing arm and fixed to the mixing arm at intervals in the length direction of the mixing arm, and extending in parallel with the cylindrical center line of the inner surface of the cylinder. The concrete mixer according to claim 1, further comprising a fixture.