JP3767724B2 - Concrete mixing drum mixer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete kneading drum mixer.
[0002]
[Prior art]
In the construction of dams, the “CSG method” is adopted for temporary cut-off work that blocks the river flow and bypasses it.
Here, CSG is an abbreviation for Cemented Sand and Gravel (to cement sand and gravel with cement), and refers to producing concrete by mixing cement with locally generated aggregates such as riverbed gravel and drilling materials. The CSG method is a method of constructing a structure by spreading and rolling concrete mixed with cement in locally generated aggregate.
According to such a CSG method, (1) no aggregate production equipment is required and muddy water is not generated during aggregate production. (2) locally generated materials (bedbed gravel and excavated sediment) are effective as aggregates. Can be used, and (3) continuous construction is possible in a wide space, and features such as increased safety can be obtained.
[0003]
By the way, a tilt drum type drum mixer is used to mix concrete with locally generated aggregate and knead the concrete.
Conventionally, a concrete kneading drum mixer provided with a large number (for example, eight) of stirring blades in the circumferential direction perpendicular to the inner peripheral surface of the drum has been used.
[0004]
[Problems to be solved by the invention]
However, in the conventional concrete kneading drum mixer, (1) of the input aggregate, a large aggregate accumulates in the vicinity of the mixer outlet and cannot be kneaded uniformly. Cannot be kneaded, (3) Target kneading time (for example, 70 to 90 sec) cannot be ensured, (4) Concrete adheres between the blades for stirring in the drum and the function of the stirring blades (5) There is a problem that the material is separated because the stirring blade is attached at right angles to the inner peripheral surface of the drum.
[0005]
Therefore, an object of the present invention is to improve the stirring function by eliminating the accumulation of aggregate near the outlet of the mixer or at the inlet side, or by preventing the concrete from adhering between the blades for stirring. An object of the present invention is to provide a concrete kneading drum mixer capable of ensuring a desired kneading time.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the invention described in claim 1
A stirring blade is provided on the inner peripheral surface of the drum installed with its axis approximately horizontal or slightly inclined. Aggregate and cement introduced from the inlet on one end side of the rotationally driven drum are mixed by the stirring blade and mixed. A concrete mixing drum mixer that discharges the kneaded concrete from the outlet on the other end of the drum,
For example, as shown in FIG.
While providing a plurality of stages of stirring blades 11, 12,... Along the axis L direction of the drum 4,
A configuration in which the positions of the first stage stirring blades 11 and the adjacent stage stirring blades 12 are different in the circumferential direction of the drum 4;
It is characterized by.
[0007]
Thus, according to the first aspect of the present invention, the concrete kneading drum mixer in which the positions of the first stage stirring blade and the adjacent stage stirring blade along the axial direction of the drum are made different in the circumferential direction of the drum. Therefore, the concrete does not adhere between the stirring blade of the first stage and the stirring blade of the adjacent stage that are in different positional relations in the circumferential direction, and the stirring function by the stirring blade is enhanced.
[0008]
Furthermore, the invention of claim 1
For example, as shown in FIG.
A configuration in which stirring blades 11, 12, 13, 14, and 15 are attached to the inner peripheral surface of the drum 4 in a shape that intersects the axis L of the drum 4 and that the end on the outlet side precedes when the drum 4 rotates.
It is characterized by.
[0009]
Therefore, according to the first aspect of the present invention, the stirring blade is attached to the inner peripheral surface of the drum in a shape that intersects the drum axis and the end on the outlet side precedes when the drum rotates. Returning to the mixer inlet side, large aggregates do not accumulate in the vicinity of the mixer outlet, and a stirring time can be ensured, and the stirring function by the stirring blades is enhanced.
[0010]
In addition, the invention of claim 1
For example, as shown in FIG.
A configuration in which spiral-shaped spiral blades 7, 8,... Are provided on the inner peripheral surface of the drum 4 on the inlet 5 side from the stirring blade 11 and the end on the stirring blade 11 side precedes when the drum rotates.
It is characterized by.
[0011]
Therefore, according to the first aspect of the present invention, since the spiral blade having the leading end on the side of the stirring blade at the time of drum rotation is provided on the inlet side of the stirring blade on the inner peripheral surface of the drum, In addition to suppressing the rapid flow of the material to the stirring blade, the material is prevented from staying on the mixer inlet side, and the stirring function by the stirring blade is enhanced.
[0014]
The invention of claim 1
For example, as shown in FIG.
A configuration in which the stirring blades 11, 12,... Are provided at an acute angle of about 50 ° toward the drum rotation direction R with respect to the inner peripheral surface of the drum 4.
It is characterized by.
[0015]
Therefore, according to the first aspect of the present invention, the stirring blades are provided at an acute angle of about 50 ° with respect to the drum inner circumferential surface in the drum rotation direction. Therefore, there is no separation of the material squeezed by the stirring blade having an acute angle of approximately 50 °, and the stirring function is ensured.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a concrete kneading drum mixer according to the present invention will be described below with reference to FIGS.
First, FIG. 1 is a longitudinal side view of a concrete mixing drum mixer as an example to which the present invention is applied, FIG. 2 is a development view of the drum, and FIG. 3 is a view showing each part of the drum. That is, FIG. 3A is an end view on the inlet side shown along the line AA in FIG. 1, FIG. 3B is a cross-sectional view taken along the line BB in FIG. c) is a sectional view taken along the line CC in FIG. 1, FIG. 3 (d) is a sectional view taken along the line DD in FIG. 1, and FIG. 3 (e) is an arrow EE in FIG. FIG. 3F is a cross-sectional view taken along the line FF in FIG. 1.
1 to 3, 1 is a charging chute, 2 is a discharging chute, 3 is a concrete mixing drum mixer, 4 is a drum, 5 is an inlet, 6 is an outlet, 7, 8 and 9 are spiral blades, 11, 12, Reference numerals 13, 14, and 15 denote stirring blades, and 16 denotes a bracket.
[0017]
In this embodiment, as shown in the figure, a concrete kneading drum mixer 3 is installed between an input chute 1 and a discharge chute 2 indicated by phantom lines, and this concrete kneading drum mixer 3 is installed on the site of a dam construction site. It is used for kneading concrete using generated aggregate.
This concrete kneading drum mixer 3 is a drum 4 made of a steel pipe having a diameter of about 1450 to 1500 mm and a total length of about 6000 mm. The drum 4 is rotationally driven by a driving device (not shown). The charging chute 1 is connected to 5, and the discharging chute 2 is connected to the fully open outlet 6 on the other end side of the drum 4.
[0018]
And the wear-resistant steel plate is lined on the inner peripheral surface of the drum 4, nothing is provided from the inlet 5 to about 600 mm, and the charging chute 1 is inserted, but the inner part is about Three spiral blades 7, 8, and 9 having a spiral shape are provided over a length of about 1200 mm.
These three spiral blades 7, 8, and 9 are made of wear-resistant steel plates, and are intended to prevent the staying of locally generated aggregate that is input from the input chute 1 and to stop the large aggregate. is there.
Furthermore, five stages (five rows) of stirring blades 11, 12, 13, 14, 15 are provided on the inner periphery of the drum 4. The stirring blades 11, 12, 13, 14, and 15 are all made of a wear-resistant steel plate.
[0019]
Specifically, the first stage (first row) of stirring blades 11 is provided over the length of about 700 mm next to the spiral blades 7, 8, 9 on the inner periphery of the drum 4. As shown in FIG. 3B, three stirring blades 11 are provided at 120 ° intervals at equal intervals in the circumferential direction.
Following the first stage stirring blade 11, the second stage (second row) stirring blade 12 is provided on the inner periphery of the drum 4 over the next length of about 800 mm. As shown in FIG. 3 (c), the three stirring blades 12 are provided at 120 ° intervals at equal intervals in the circumferential direction. However, the stirring blades 12 are positioned in the circumferential direction from the first stirring blade 11. Is shifted by 60 °.
Following the second stage stirring blade 12 as described above, the third stage (third row) stirring blade 13 is provided on the inner periphery of the drum 4 over the next length of about 800 mm. As shown in FIG. 3 (d), the three stirring blades 13 are provided at 120 ° intervals at equal intervals in the circumferential direction, but are positioned in the circumferential direction with respect to the second stirring blade 12. Is shifted by 60 °.
[0020]
Then, following the third stage stirring blade 13 as described above, the fourth stage (fourth row) stirring blade 14 is provided on the inner periphery of the drum 4 over the next length of about 850 mm. Yes. As shown in FIG. 3 (e), the three stirring blades 14 are provided at 120 ° intervals at equal intervals in the circumferential direction, but are positioned in the circumferential direction with respect to the third-stage stirring blade 13. Is shifted by 60 °.
Further, following the fourth stage stirring blade 14 as described above, the fifth stage (fifth row) stirring blade 15 extending to the outlet 6 over the next length of about 1000 mm is provided on the inner periphery of the drum 4. Is provided. As shown in FIG. 3 (f), the three stirring blades 15 are provided at 120 ° intervals at equal intervals in the circumferential direction, but are positioned in the circumferential direction with respect to the fourth stirring blade 14. Is shifted by 60 °.
[0021]
In the above, the drum 4 is used in the tilt angle range of −2 ° to + 8 ° as indicated by the angles α and β, although the axis L is parallel in the illustrated example.
The total five stages (five rows) of stirring blades 11, 12, 13, 14, 15 are respectively attached to the inner periphery of the drum 4 via a pair of brackets 16, 16. It is attached to the drum 4 with a shape and an angular position so that the materials to be agitated (locally generated aggregate and cement) are returned toward the inlet 5 side with rotation. The bracket 16 has a height of about 100 mm.
Moreover, each of the stirring blades 11, 12, 13, 14, 15 is attached to the drum 4 at an acute angle of 50 ° toward the rotation direction R of the drum 4 as shown in FIG. 4.
Here, each stirring blade 11, 12, 13, 14, 15 has a width of about 190 mm and a thickness of about 16 mm. The same applies to the spiral blades 7, 8, and 9.
[0022]
Next, the effect | action by the concrete kneading drum mixer 3 by the above structure is demonstrated.
The number of rotations of the drum 4 can be arbitrarily changed between 5 and 20 rpm, and the kneading time is set to 70 to 90 sec.
[0023]
(1) A total of five stages (five rows) of stirring blades 11, 12, 13, 14, and 15 are provided, and each of the stirring blades 11, 12, 13, 14, and 15 is three per stage (one row), Since each of the stirring blades 11, 12, 13, 14, and 15 is attached to the drum 4 in a staggered arrangement in the direction of the axis L (see FIG. 2 showing the development of the drum), between the adjacent steps in the axis direction and the circumference It is possible to prevent the concrete from adhering between the directional ones.
[0024]
(2) Since the spiral blades 7, 8, 9 are provided on the inlet 5 side, the material (locally generated aggregate and cement) after the first stage (first row) of the stirring blades 11 and particularly large aggregates Therefore, it is possible to prevent a material, in particular, fine aggregates from staying on the inlet 5 side.
[0025]
(3) Each stirring blade 11, 12, 13, 14, 15 has an acute angle of 50 ° toward the rotation direction R, and has a shape and an angular position for returning the material toward the inlet 5 side. Since it is attached to the drum 4, kneading time can be secured, and separation of the material squeezed by the stirring blades 11, 12, 13, 14, 15 can be prevented.
[0026]
As a result, the kneading time can be secured for about 90 seconds, and high-quality concrete can be obtained.
Moreover, according to the above concrete kneading drum mixer 3, it can knead in large quantities continuously, and is therefore suitable for use in dam construction.
In the above, from various test results in which the rotational speed and the drum inclination angle were changed, the rotational speed: about 10 rpm and the drum angle: about 6 ° were found as stable best values.
[0027]
In the embodiment described above, five stages of stirring blades are used in the drum axis direction. However, the present invention is not limited to this, and two to four stages of stirring blades or six or more stages of stirring blades are used. It may be a wing.
Further, the material and shape of the stirring blades are arbitrary, and it is needless to say that other specific detailed structures can be appropriately changed.
[0028]
【The invention's effect】
As described above, according to the concrete kneading drum mixer according to the first aspect of the present invention, the positions of the first stage stirring blade and the adjacent stage stirring blade along the drum axial direction are made different in the drum circumferential direction. Therefore, concrete does not adhere between the stirring blade of the first stage and the stirring blade of the next stage, which are in different positions in the circumferential direction, and the stirring function by the stirring blade is enhanced, ensuring a desired kneading time. Can contribute.
[0029]
In addition, the stirring blade is attached to the inner peripheral surface of the drum in a shape that intersects the drum axis and the end on the outlet side precedes when the drum rotates, so that the stirring blade returns the material to the mixer inlet side, and the mixer outlet A large aggregate does not accumulate in the vicinity, and the stirring time by the stirring blade can be secured. Therefore, the stirring function is enhanced, which can contribute to securing a desired kneading time.
[0030]
Then, since the spiral blade with the spiral blade leading the end of the stirring blade side at the time of drum rotation is provided on the inlet side of the stirring blade on the inner peripheral surface of the drum, the spiral blade causes a rapid flow of material to the stirring blade. While suppressing, the retention of the material at the mixer inlet side can be prevented, and the stirring function by the stirring blades can be enhanced, which contributes to securing a desired kneading time.
[0032]
Moreover, since the stirring blades are provided at an acute angle of approximately 50 ° toward the drum rotation direction with respect to the drum inner peripheral surface, the stirring blades having an acute angle of approximately 50 ° toward the rotation direction of the drum inner peripheral surface are used. There is no separation of the materials to be crushed, the stirring function can be ensured, and the desired kneading time can be ensured to further contribute.
[Brief description of the drawings]
FIG. 1 is a vertical side view of a concrete kneading drum mixer as an example to which the present invention is applied.
FIG. 2 is a development view of the drum of FIG. 1;
3 shows each part of the drum of FIG. 1, wherein (a) is an end view of the inlet side taken along the line AA in FIG. 1, and (b) is an arrow BB line in FIG. (C) is a cross-sectional view along the line CC in FIG. 1, (d) is a cross-sectional view along the line DD in FIG. 1, and (e) is an arrow in FIG. Sectional drawing along the EE line, (f) is a sectional view along the arrow FF line of FIG.
4 is an enlarged view showing the mounting angle of the stirring blades of FIGS. 3 (b) to 3 (f). FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Input chute 2 Discharge chute 3 Concrete kneading drum mixer 4 Drum 5 Inlet 6 Outlet 7, 8, 9 Spiral blade 11, 12, 13, 14, 15 Stirrer blade 16 Bracket L Drum axis R Drum rotation direction

Claims (1)

A stirring blade is provided on the inner peripheral surface of the drum installed with its axis approximately horizontal or slightly inclined. Aggregate and cement introduced from the inlet on one end side of the rotationally driven drum are mixed by the stirring blade and mixed. A concrete mixing drum mixer that discharges the kneaded concrete from the outlet on the other end of the drum,
While providing a plurality of stirring blades along the axial direction of the drum,
The position of the stirring blade of one stage and the stirring blade of the next stage is made different in the circumferential direction of the drum,
In addition, the stirring blade is attached to the inner peripheral surface of the drum at an angle of approximately 50 ° that is acute with respect to the drum rotation direction in a shape that intersects the axis of the drum and precedes the end on the outlet side when the drum rotates.
Provided on the inlet side of the stirring blade on the inner peripheral surface of the drum is a spiral blade having a spiral shape preceded by the end of the stirring blade side when the drum rotates,
Concrete kneading drum mixer characterized by.

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