JP4167951B2 - Biaxial mixer for ready-mixed concrete - Google Patents

Description

The present invention relates to a biaxial mixer used for kneading ready-mixed concrete, mortar, and the like.

A conventional biaxial mixer for kneading ready-mixed concrete is rotatable in an agitation tank, two horizontal shafts are arranged in parallel, an agitation blade is attached in the longitudinal direction of the shaft, and the shaft is rotated, whereby the agitation blade The material was kneaded while stirring the material in the up and down direction.
At this time, the material in the stirring vessel was kneaded by kneading the material while repeatedly circulating and moving the inside of the stirring vessel in an annular shape in the horizontal direction. In order to increase the circulation movement of the material, the stirring blade has a spiral shape, and the movement speed of the material has been increased by continuously moving the material in the longitudinal direction of the shaft.

Furthermore, the stirring blade is provided with a stirring and conveying portion and a stirring turning portion, and when the material sent in the longitudinal direction of the shaft by the stirring and feeding portion is sent to the stirring turning portion, the feeding force in the direction opposite to the stirring and feeding portion is obtained. The material which has been applied and has lost its place of travel is changed in the direction of movement in the lateral direction and sent to the adjacent shaft side.
In addition, a paddle-shaped feed blade is provided on the shaft in order to feed the material to the other shaft side more securely, and the paddle-shaped feed blade is rotated by the rotation of the shaft, and the material is pumped out to the other shaft side by the feed blade. While sending. (For example, see Patent Document 1)
JP 2003-126668 A

However, in the configuration as described above, the movement of the material in the longitudinal direction of the shaft is enhanced, but the movement of the material from one shaft to the other adjacent shaft necessary for the circular movement is not sufficiently performed.
According to the conventional configuration, as described above, the material is moved only in the longitudinal direction of the shaft from both the forward and reverse directions to increase the density of the material at one point where the materials collide with each other, and only the material that overflows from it has a place to go. Since it is lost and moved to the side of the adjacent shaft, the amount of movement is not sufficient, and the material cannot be circulated smoothly.
Moreover, in the material movement using the paddle-shaped feeding blade, the material moving in the direction of the rotation axis is continuously fed along the spiral by the rotation of the helical stirring blade, but moves to the other shaft side. Since the material is sent to the other shaft side in accordance with the rotation period by the periodically rotating paddle, the material is intermittently sent and the material that is sent continuously in the direction of the rotation axis is on the other shaft side. Cannot send continuously.

Therefore, the material in the stirring tank cannot be circulated uniformly, and the concrete kneading is unevenly kneaded, and it is impossible to produce uniform and high-quality concrete.
In particular, when kneading high-viscosity high-performance concrete such as high-strength concrete or high-fluidity concrete, the movement of the material is difficult, so only a small amount of movement to the adjacent shaft is performed, and sufficient kneading cannot be performed. . In order to make the material uniform, it is necessary to knead for a long time, and it becomes difficult to efficiently produce ready-mixed concrete in a short time.
Therefore, an object of the present invention is to provide a biaxial mixer for ready-mixed concrete in which the entire material in the stirring tank is circulated and moved continuously in the biaxial mixer used for kneading ready-mixed concrete.

The present invention is provided with a kneading tank and a kneading blade provided with two stirring tools that rotate horizontally and parallel to the kneading tank, and the stirring tool has a spiral material conveying surface that continuously feeds the material in the rotation axis direction. In the ready-mixed biaxial mixer for ready-mixed concrete,
A direction changing portion having a guide surface for changing the moving direction of the material continuously moving along the material conveying surface to one end of the kneading blade to the direction of the other stirring tool is provided.

According to the first aspect of the present invention, since the material movement in the direction of the rotation axis and the material movement to the other stirring tool are continuously performed, the circulating movement of the material in the entire stirring tank is smoothly performed, and the material Can be uniformly stirred, and high-quality ready-mixed concrete can be obtained.
According to the second aspect, the turning blade for feeding the material in the direction opposite to the kneading blade is provided, and the material movement to the other stirring tool can be continuously performed even when the material of the turning blade is moved.
According to the third aspect, the guide surface is provided substantially perpendicular to the material flow in the direction of the rotation axis, and the material flow is changed over the entire area of the guide surface, so that the material can be moved to the other stirring tool. Can be done in large quantities.
According to the fourth aspect, since the guide surface is provided with an inclination in one direction with respect to the material flow in the rotation axis direction, the material flow can be changed more smoothly.
According to claim 5, since the guide surface is provided with an inclination in two directions with respect to the flow of the material in the direction of the rotation axis, even when stirring high-viscosity high-performance concrete, The movement of the material becomes easy.
According to the sixth aspect, the direction changing portion can be easily replaced.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a plan view of an embodiment of a biaxial mixer according to the present invention. FIG. 2 is an overall perspective view of the biaxial mixer of FIG. FIG. 3 shows a detailed view of the material direction changing section of the G section in FIG.
The agitation tank 10 is opened upward, serves as a material inlet, and has a discharge port provided with a gate that can be opened and closed at a lower portion. Further, two horizontal and parallel rotating shaft cores P are provided inside the stirring tank 10, and stirring tools 1 a and 1 b having the rotating shaft cores as rotation centers are provided on the respective rotating shaft cores P.
The two stirring tools 1a and 1b are rotatably provided in the stirring tank 10 so as to rotate in opposite directions around the rotation axis.
The stirrer 1 has a kneading blade 2 formed in a spiral with respect to the rotation axis P, and a turning blade 11 formed in a spiral that twists in the opposite direction to the kneading blade 2, and the kneading blade 2 and the turning blade 11. Are arranged side by side in the direction of the rotational axis.
Adjacent ends of the kneading blade 2 and the cutting blade 11 connected in parallel are connected to each other, and both ends of the kneading blade 2 and the turning blade 11 connected on the rotation axis are not connected to the rotation support member 12.
The rotation support member 12 is provided so as to slightly protrude from the shaft support side wall 13 in the stirring tank 10, and is provided to be rotatable about the rotation axis P.

The stirring tools 1a and 1b are provided horizontally and in parallel in the stirring tank 10 so as to be rotatable about the rotation axis P.
The two stirring tools 1a and 1b provided in the stirring tank 10 are configured such that the blades facing each other are different. A kneading blade 2 is provided at one end of one stirring tool 1a, and a turning blade 11 is provided on the opposite side of the other stirring tool 1b.
One end of the kneading blade 2 and the turning blade 11 on the material moving direction side has a guide surface 5 that guides the flow of material movement to the other stirring tool 1b, and the direction of the material flow is the other stirring tool. A direction changing unit 4 for changing the direction 1b is provided.
The direction changing unit 4 continuously changes the direction of the material moving continuously along the spiral material conveying surface 3 of the kneading blade 2 and the turning blade 11 to the direction of the other stirring tool 1b, thereby continuously changing the other direction. The material is sent to the stirring tool 1b.

FIG. 10 is a plan view of the kneading blade 2, and FIG. 11 is an end view of the kneading blade shown in FIG. 10 at each of the parts (a) to (e).
As shown in FIG. 11, the kneading blade 2 is formed in a spiral shape while being twisted.
In FIG. 11, the end surface which cut | disconnected the kneading blade | wing 2 helically formed by the angle of 180 degrees by (a)-(e) is shown in figure, and the kneading blade | wing 2 rotates, and the material in the stirring tank 10 is shown. The material is continuously moved along the spiral material conveying surface 3 to feed the material upward (X direction) in FIG. 10 in the rotation axis direction.
The material moved from the part (a) of FIG. 11 to the part (e) along the material conveying surface 3 is sent to the direction changing part 4 provided at the end of the kneading blade 2 in the part (e).
The guide surface 5 provided in the direction changing section 4 receives the material flow and changes the direction of the material flow to the direction of the other stirring tool 1b (Z direction) while maintaining a continuous flow state. Thereby, the material sent by rotation of the kneading blade 2 is continuously sent to the other stirring tool 1b side.
Therefore, it is possible to feed the material to the other stirring tool 1b with the same continuous flow without losing the continuous flow of the material in the direction of the rotation axis.

Moreover, since the said direction change part 4 is provided also in the other stirring tool 1b which opposes, the material in the stirring tank 10 is one stirring tool 1a so that the flow of material may be shown by the X and Z arrows in FIG. The kneading blade 2 moves in the direction of the axis of rotation (Xa direction), and the direction of the other stirring tool 1b (Za) is continuously changed by the direction changing portion 4 provided at one end on the material flow direction side of the kneading blade 2. The direction of the flow is changed to (direction) and moves to the other stirring tool 1b.
The material that has moved to the other stirring tool 1b is moved in the direction of the rotation axis (Xb direction) by the kneading blade 2 in the direction opposite to that of the one stirring tool 1a. The flow (Xb direction) is changed again to one stirring tool 1a by the direction changing part 4 provided, and it moves continuously.
As a result, the circulating movement of the material in the entire agitation tank 10 can be continuously moved, and the material can be moved uniformly without shifting the flow of the moving material, so that high-quality ready-mixed concrete can be obtained. .

The direction changing portion 4 may be fixed by bending one end of the kneading blade 2 to provide the guide surface 5 or welding a member having the guide surface 5, but using a fixing tool such as a bolt or a screw. By attaching it to the one end of the kneading blade so as to be detachable, the guide surface 5 can be easily replaced due to wear.
Furthermore, the amount and direction of the material when changing the flow direction of the material can be arbitrarily changed by exchanging with another direction changing portion 4 having a different mounting angle of the guiding surface 5 or the size of the guiding surface, and kneading is performed. It becomes possible to adjust the movement of the entire material kneading tank according to the properties of the concrete.
In the said form, the stirring tool 1 is equipped with the kneading blade 2 and the turning blade 11, and the direction change part 4 is provided in both the kneading blade 2 and the turning blade 11, so that a larger amount of material is transferred to the other stirring tool 1b. However, the present invention is not limited to this, and it is possible to provide only the other kneading blade 2 in the stirring tool 1 without providing the turning blade 11 and to provide the direction changing portion 4 in the kneading blade 2. The movement to the stirring tool 1b is enabled.

Next, a first embodiment of the present invention will be described with reference to the drawings.
4 shows an arrow view of the kneading blade 2a viewed from the rotation axis P, and FIG. 5 shows an AA arrow view in FIG.
In FIG. 4, the direction change part 4 provided in the edge part of the kneading blade 2 is shown.
As described above with reference to FIG. 11, the material in the stirring tank 10 is continuously fed along the material conveying surface 3 of the kneading blade 2.
In FIG. 4, the flow of the material sent along the material conveying surface 3 is indicated by an arrow X.
The material flow X flows along the material conveying surface 3 and reaches the direction changing unit 4 provided at the end of the kneading blade 2a.
The guide surface 5 provided in the direction conversion unit 4 is disposed in the same plane as the plane passing through the rotation axis P, and is disposed in a plane perpendicular to the material conveyance surface 3.
In FIG. 5, the angle between the material surface 3 and the guide surface 5 at the position where the direction changer 4 is provided is indicated by β, but the guide surface is provided at a position where the angle β is 90 °. Is done.
By arranging the guide surface 5, the continuous material flow X sent from the material conveying surface 3 is received by the guide surface 5 and changed to the material flow direction Z, so that the flow of the material can be reduced without impairing the continuous flow. Only the direction is changed and the material is sent to the other stirring tool side.
The angle β is 90 ° as the best angle, and the material flow can be changed. However, the angle is not limited, and the angle β has the same effect in the range of 60 ° to 120 ° depending on the properties of the concrete to be kneaded. To get.
According to the first embodiment, since the guide surface 5 hits substantially perpendicularly to the material flow along the material conveying surface 3 and changes the material flow, the mortar with less viscosity and the civil engineering work site with less cementation amount are used. Suitable for moving materials when mixing poor blended concrete used for placing

6 and 7 illustrate the second embodiment of the present invention.
6 shows an arrow view of the kneading blade 2b as seen from the rotational axis P, as in FIG. 4, and FIG. 7 shows an arrow view of BB in FIG.
In the second embodiment, in FIG. 6, the guide surface 5 provided at one end of the direction changing portion 4 has an angle α with the plane passing through the rotational axis P so that the outer side in the rotational radius direction in FIG. Further, it is disposed on a surface perpendicular to the material conveying surface 3.
According to the second embodiment, the flow of the material is not caused by the guide surface 5 being inclined at an angle α with respect to the material flow X moving along the material conveying surface 3 but at a right angle. Without interrupting the flow, it is possible to smoothly guide to the other stirrer 1b side and change the material flow. Therefore, the continuous flow of the material can be changed more continuously in the direction Z of the other stirring tool 1b, and the material can be sent more reliably.
The angle α can be changed to 45 ° as the best angle, but the flow of the material can be changed, but the angle is not limited, and the same effect is obtained in the range of 30 ° to 60 ° depending on the properties of the concrete to be kneaded. To get.
According to the second embodiment, the guide surface has an angle α with respect to the material flow and is inclined only in one direction, so that when the ordinary concrete generally used is agitated, the other agitator 1b side can be efficiently stirred. Suitable for moving material.

Example 3 is shown in FIGS.
FIG. 8 shows an arrow view of the kneading blade 2c as seen from the rotational axis P as in FIG. 4, and FIG. 9 shows a cc arrow view of FIG.
In FIG. 8, the guide surface 5 has an angle α with the plane passing through the rotation axis P, and is disposed so as to be inclined so that the outer side in the rotational radius direction in FIG. The angle β between the material conveying surface 3 and the material conveying surface 3 is 90 ° or more.
According to the third embodiment, the guide surface 5 receives the material flow with an inclination in the two directions of the angle α and the angle β with respect to the material flow in which the guide surface 5 moves along the material conveyance surface 3. The flow direction can be changed more easily and the material can be sent to the other stirring tool.
The angle α is 45 °, and the angle β is 120 °, and the flow of the material can be changed. However, the angle α is not limited, and the angle α is 30 ° to 60 °, depending on the properties of the concrete to be kneaded. The angle β obtains the same effect in the range of 100 ° to 135 °.
According to the third embodiment, since the guide surface 5 is inclined in two directions of the angle α and the angle β with respect to the material flow, the concrete is more viscous than the various concretes, for example, high-flowing concrete. Suitable for moving materials when stirring high-performance concrete such as concrete and high-strength concrete.

1 is a plan view of an embodiment of a biaxial mixer according to the present invention. The whole perspective view of the biaxial mixer by this invention. The partial detail drawing of the G section in FIG. The arrow view which looked at the kneading | mixing blade | wing of Example 1 from the rotating shaft core P. FIG. The AA arrow directional view in FIG. The arrow view which looked at the kneading | mixing blade | wing of Example 2 from the rotating shaft core P. FIG. The BB arrow line view in FIG. The arrow view which looked at the kneading | mixing blade | wing of Example 3 from the rotating shaft core P. FIG. CC arrow line view in FIG. A top view of a kneading blade. The end elevation in each part of (a)-(e) of the kneading blade in FIG.

Explanation of symbols

1 Stirrer 2 Kneading blade 3 Material transport surface 4 Direction changing part 5 Guide surface

Claims (6)

For ready-mixed concrete provided with a kneading tank and two kneading tools that rotate horizontally and parallel to the kneading tank, the kneading tool having a kneading blade having a spiral material conveying surface that continuously feeds the material in the direction of the rotation axis In the two-axis mixer,
2. A ready-mixed concrete two-piece comprising a direction changing portion having a guide surface for changing the moving direction of the material continuously moving along the material conveying surface to one end of the kneading blade to the direction of the other stirring tool. Axial mixer.
The said agitator is provided with a turning blade having a spiral material conveying surface in a direction opposite to that of the kneading blade, and the direction changing portion is provided at one end of the turning blade. 2 axis mixer.
The biaxial mixer for ready-mixed concrete according to claim 1 or 2, wherein the guide surface is a plane that passes through the axis of rotation and is perpendicular to the material conveyance surface of the kneading blade.
3. The raw material according to claim 1, wherein the guide surface is inclined with respect to a plane passing through the rotation axis so that an outer radius of rotation is lower and is perpendicular to a material conveying surface of the kneading blade. A twin-screw mixer for concrete.
The guide surface is provided so as to be inclined with respect to a plane passing through the axis of rotation so that the outside of the rotation radius is lower, and provided at an angle greater than or equal to a material conveyance surface of the kneading blade. The biaxial mixer for ready-mixed concrete according to 1 or 2.
The biaxial mixer for ready-mixed concrete according to any one of claims 1 to 5, wherein the direction changing portion is detachably provided.

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