JP3055835B2 - Stirring mixing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for stirring and mixing mortar, cement milk, powdery and other modifiers into the ground while discharging and injecting the same into the ground in order to enhance the soil resistance of the soft ground. And a stirring and mixing apparatus.

[0002]

2. Description of the Related Art A large number of devices of this type have been known in the prior art. Generally, a rotary shaft rotated by a drive motor, a drilling wing attached to a lower end of the rotary shaft so as to be integrally rotatable, and With a stirring blade located above the excavation wing and attached so as to be integrally rotatable with the rotating shaft,
A supply passage for feeding the improving material is provided along the rotation axis. The improved material is conveyed through a supply passage to a discharge port provided at the base of the stirring blade, and is discharged and injected into the surrounding soil with the rotation of the stirring blade and mixed with the soil. To obtain the treated ground.

[0003]

However, in the conventional apparatus, since the stirring blade is simply rotated together with the rotation axis, the rotation trajectory drawn by the stirring blade at the time of stirring, when viewed from above, is simple. It is represented by a simple circle. Therefore, for example, as shown in FIG. 4, when ground improvement is required over a specific wide area 101 and the stirring operation is sequentially shifted by the rotation diameter of the stirring blade and the stirring operation is advanced. Circular area 10 shown by white part inside
2 can perform a stirring and mixing process. However, the remaining area 103 indicated by oblique lines cannot be processed, and the area 101 cannot be improved by 100%. In order to improve the area 103 by 100%, the remaining areas 103 must be separately processed. This has the problem that waste of improvement material and time loss occur, and efficient improvement work and the like cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the agitation / mixing process which can efficiently improve the soil in a specific area by mixing with the augmenting material. It is to provide a device.

[0005]

In order to achieve the above object, the present invention provides a stirring and mixing processing apparatus for rotating a stirring blade attached to a rotating shaft to mix and stir ground soil and an improving material. the stirring blade fixedly attached to the periphery, provided with a possible aileron out forward and backward from the distal end of the stirring blade, the drive means and that produce reciprocating the aileron,
The agitation is performed by controlling the driving means based on input data.
The auxiliary wing protrudes and retreats according to the rotation angle within the plane trajectory of the wing
It is provided with a controller to be evacuated .

[0006]

According to this structure, if the auxiliary wing is projected and retracted by the control of the driving means while the stirring wing is being rotated together with the rotating shaft, the stirring wing is drawn by the advance and retreat timing of the auxiliary wing. The rotation locus can be formed in a non-circular shape such as a substantially rectangular shape in a plane. Therefore, for example, even in the case of improving the ground soil in a substantially rectangular planar area, the area is divided into rectangular areas by about 100%.
It is also possible to improve by stirring thoroughly.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side view of an essential part showing a part of a stirring and mixing processing apparatus according to an embodiment of the present invention, and FIG.
FIG. 2 is a schematic sectional view showing a stirring state along the line AA in FIG. 1.

In FIGS. 1 and 2, in this device,
A rotating shaft 1 rotated by a drive motor (not shown);
The rotation shaft 1 is provided with a pair of left and right stirring blades 2. Although not shown, the rotating shaft 1 is provided with a fluid pipe through which mortar, cement milk, powdery and granular improving material, and the like are injected and discharged and injected during the stirring and mixing process. Has been established.

More specifically, each of the stirring blades 2 is formed in a hollow cylindrical shape, and one end of the stirring blade 2 is a rotary shaft 1.
The inside is open, and the other end is open to the outside. In addition, an auxiliary blade 3 and a hydraulic cylinder 4 are disposed in each stirring blade 2.

The auxiliary wing 3 is provided so as to be able to advance and retreat from the other end of the stirring wing 2, and is fixedly attached to a piston 4a of a hydraulic cylinder 4 as a driving means. Then, the hydraulic cylinder 4 is driven to move forward and backward in directions indicated by arrows BC in FIG. 1.

On the other hand, each hydraulic cylinder 4 is fixedly mounted inside the stirring blade 2, and further connected to a hydraulic controller 6 via a hydraulic pipe 5. This hydraulic controller 6
Drives the hydraulic cylinder 4 based on data input to a microcomputer (not shown) to adjust the amount of protrusion of the piston 4a, and by this adjustment, the amount of protrusion of the auxiliary blade 3 with respect to the stirring blade 2 can be adjusted. ing.

A control example of the hydraulic controller 6 employed in the embodiment will be briefly described. As a setting condition, an applicable shape is selected, and a shape function for the amount of extension of the piston 4a in the hydraulic cylinder 4 is determined. However, the application shape is not limited. A / D conversion is performed on the shape function (analog value).
The digital signal (ON / OFF signal) of the shape function is converted into an ON / OFF signal of the servo valve. Set the resolution of the servo valve for counting control to the resolution of the required cylinder stroke. The resolution of the cylinder stroke is defined as a minimum oil flow unit △ Q that defines the amount of movement of the piston 4a at one time. A servo valve for counting control is incorporated in the cylinder circuit.

Here, as the shape function, for example, as shown in FIG. 3, the pile shape is a square cross section, the radius of the inscribed circle is r, and the maximum extension L of the auxiliary wing 3 by the hydraulic cylinder 4 is L. This maximum elongation amount L is expressed by the following equation as a function of the rotation angle ωt of the stirring blade 2. L = f (ωt) = r × tan ωt−r = r (tan ωt−1) Further, since tan π / 4 = √2, the range of the amount of elongation of the cylinder is as follows. 0 ≦ 1 ≦ 0.414 × r

In the calculation, first, the rotation angle ωt of the stirring blade 2 is A / D converted according to a predetermined resolution. Wherein in the case of shape example, obtains the L = r (tan ωt-1 ) corresponding to the minimum bit △ .omega.t ₁ of the rotational angle .omega.t for △ L _1.
Here, △ L _n is counted as n times the minimum oil flow unit △ Q. That is, ΔL _k = n × ΔQ ₁ and ΔL ₂ , ΔL ₃ , ΔL _4, ..., ΔL _n signals are sent to the count control servo valve in accordance with the rotation of the stirring blade 2. Sent.

Then, an oil flow rate of n × ΔQ according to the signal of the calculation result flows from the servo valve to the cylinder circuit. A cylinder stroke according to the change in the shape function is obtained, and a predetermined pile shape is completed according to the amount of protrusion of the piston 4a.

Next, the operation of the above-structured mixing apparatus will be described. First, the rotating shaft 1 is rotated by a drive motor (not shown), and the stirring blade 2 integrally starts rotating while cutting the ground soil. At this time, the auxiliary wing 3
Is in the state shown by the solid line in FIGS. 1 and 2 which is most retracted with respect to the stirring blade 2, the stirring blade 2 and the auxiliary blade 3
Rotates while stirring in an area drawn by a plane circular rotation locus indicated by reference numeral 10 in FIG.

Here, when it is necessary to perform a stirring process in a plane rectangular area indicated by reference numeral 11 in FIG. 2, the piston 4a is gradually projected from point D to point E, Further, when the hydraulic cylinder 4 is controlled via the hydraulic controller 6 so that the piston 4a is gradually retracted from the point E to the point D, the auxiliary is interlocked with the advance and retreat of the piston 4a. The blades 3 are also protruded from the stirring blades 2, whereby the stirring blades 2 and the auxiliary blades 3 can perform a stirring process in a region drawn by a plane locus of rotation indicated by reference numeral 11 in FIG. 2.

Therefore, when the stirring and mixing apparatus according to this embodiment is used, for example, when the rectangular area 101 as shown in FIG. 4 is to be improved, the area 103 which cannot be improved at once by the conventional apparatus. However, as shown in FIG. 3, the improvement processing can be performed at once while dividing the area 101 into rectangular areas.

In the above embodiment, the structure using the hydraulic cylinder 4 as the driving means for moving the auxiliary wing 3 forward and backward is disclosed, but a motor or the like may be used as a driving source. Also, the case where the shape of the improved processing area is rectangular has been described, but this shape can be arbitrarily formed by adjusting the protrusion amount of the auxiliary wing 3 based on data input to a microcomputer or the like. For example, a triangular shape, a hexagonal shape, an elliptical shape, or the like can be designed as a cross-sectional shape.

[0020]

As described above, according to the stirring and mixing apparatus of the present invention, while the stirring blade is being rotated together with the rotating shaft, the auxiliary blade is projected and retracted by controlling the driving means such as the hydraulic cylinder. By doing so, the rotation trajectory drawn by the stirring blade can be formed in a non-circular shape such as a substantially rectangular shape in a plane. Therefore, for example, even in the case of improving the ground soil in a substantially rectangular area on a plane, it is possible to improve the area by agitating the whole area by about 100% while dividing the area into rectangular areas.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a main part of a stirring and mixing apparatus according to an embodiment of the present invention, which is partially cut away.

FIG. 2 is a schematic cross-sectional view showing a stirring state along the line AA in FIG.

FIG. 3 is a diagram for explaining an improved area when the stirring and mixing processing apparatus according to the present invention is applied.

FIG. 4 is a diagram for explaining an improved area when a conventional stirring and mixing processing apparatus is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary shaft 2 Stirrer blade 3 Auxiliary wing 4 Hydraulic cylinder (drive means) 4a Piston 5 Hydraulic pipe 6 Hydraulic controller

Claims (1)

(57) [Claims] 1. A stirring blade attached to a rotating shaft is rotated,
In a stirring and mixing processing apparatus for mixing and stirring the ground soil and the improving material, the stirring blade fixedly mounted around the rotation shaft is provided with an auxiliary wing that can advance and retreat from the tip of the stirring blade. driving means that issues retractable aileron and the driving means
Control based on input data and within the plane trajectory of the stirring blade
Controller that protrudes and retracts the auxiliary wing according to the rotation angle at
And has, agitation and mixing apparatus, characterized in that it comprises a.