JP2521567Y2 - Agitating and mixing shaft of ground improvement machine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring and mixing shaft for a ground improvement machine.

[0002]

2. Description of the Related Art When cement milk or the like is injected and mixed by stirring for ground improvement or the like, it may not be completely mixed.

FIG. 5 shows an example of a known stirring and mixing shaft. In this, two stages of rotary blades 28a and 28b are fixedly installed in the lower part of a hollow drive shaft 27 at intervals in the vertical direction, and a stationary blade 29 is attached between the upper and lower rotary blades. Then, cement milk is injected from the cement milk injection pipe 30 on the upper side, and the drive shaft 27
It passes through the inside and is discharged into the soil from the cement milk discharge port 31 provided at the lower end of the drive shaft 27. Reference numeral 32 is an auger motor, and 33 is an auger drive speed reducer. Reference numeral 34 is a drill bit at the lower end of the drive shaft.

FIG. 6 shows a case of two axes. In this case,
Two drive shafts 27a and 27b are provided in parallel, and rotor blades are provided on each shaft.
28a and 28b are vertically separated from each other, and a connecting member 29 'for connecting the two drive shafts is provided between them.

In the case of the single shaft shown in FIG. 5 or the two shafts shown in FIG. 6, the stationary blade 28 or the connecting member 28 'does not rotate due to the resistance received from the ground and works as a stationary blade. But the rotor
If stones or the like are caught between 27a and 27b and the stationary blade 28 or the connecting member 28 ', there is a drawback that they rotate together. In addition, there is no guarantee that co-rotation will not occur even on soft ground.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to theoretically provide rotary blades whose rotations are normal and reverse so that earth and sand and cement milk can be reliably mixed.

[0007]

[Means for Solving the Problems] The stirring and mixing shaft has a double structure of an inner pipe and an outer pipe serving as a cement milk supply passage, and a normal blade is provided on the lower outer periphery of the outer pipe and a sun gear is provided on the lower end of the outer pipe. It is attached to this sun gear through a planetary gear, and meshes with a ring gear that has fixed blades longer than the normal rotation blade fixed to the outer circumference, while the planetary gear shaft can rotate with respect to the inner tube and has the same size as the normal rotation blade on the outer circumference. It was mounted on top of the lower body with inverted wings.

[0008]

EXAMPLE An explanation will be given with reference to FIGS. In FIG. 1, 9 is a base machine, on which a reader 10 is erected, on which a stirring and mixing shaft 11 according to the present invention is supported. 2 is an enlarged cross-sectional view of the lower portion of the stirring / mixing shaft 11, FIG. 3 is a plan view of a planetary gear mechanism provided inside the stirring / mixing shaft, and FIG. 4 is a cross-sectional view showing a state during construction.

In FIG. 1, an agitating and mixing shaft 11 includes an inner pipe 12 and an outer pipe 1.
It consists of 3. The inner pipe 12 is fixed to the rod guide 14 or attached to the outer pipe 13 either rotatably or fixedly, and cement milk or the like is supplied from the outside. A planetary gear mechanism (FIG. 2) is incorporated in the lower portion of the outer tube 13. The rotation of the outer tube 13 serving as the drive shaft is transmitted to the sun gear 15 of the planetary gear mechanism. The rotation of the sun gear 15 is transmitted from the first stage planetary gear 16a to the second stage planetary gear 16b, and the torque is transmitted to the ring gear 17. A fixed blade 18 is fixed to the outside of the ring gear 17 having an internal gear, and receives a rotational reaction force from the ground. That is, the ring gear 17 integrated with the fixed blade 18 does not rotate.

The torque transmitted by the sun gear 15 is transmitted from the meshing portion of the planet gear 16b and the ring gear 17 to the planet gear 16.
Together with the holding blocks 19 of a and 16b, they rotate in a direction opposite to the rotation direction of the outer tube 13 which is the drive shaft.

The holding block 19 and the lower body 20 attached to the lower end of the inner pipe 12 are integrally fixed by bolts or the like, and the reversing blades 21 are fixed to the outer circumference. Reference numeral 22 is a forward rotating blade fixed to the lower portion of the outer tube 13. As is apparent from FIG. 2, the outer diameter dimension D ₂ of the fixed blade 18 is larger than the outer diameter dimension D ₁ of the forward rotating blade 22 and the reverse rotating blade 21.

When the outer tube 13, which is the drive shaft, is rotated, the fixed blade 1
Reference numeral 8 cuts into the ground and receives a reaction force at the reaction force receiving portion L in FIG. A forward rotating blade 22 that rotates together with the drive shaft, and a reverse rotating blade 21 that rotates below the inner tube 12 via a planetary gear mechanism.
Is forced to rotate normally and reversely, so the effect of stirring and mixing becomes greater.

[0013]

Operation Returning to FIG. 1, the cement milk produced in the cement plant 23 passes through the flow meter 24 and the supply pipe 25,
It is supplied from the upper part of the inner pipe 12. Flow down the inner tube 12,
It is discharged into the ground from the cement milk discharge port 23 at the lower end. On the other hand, when the outer tube 13, which is the drive shaft, is rotationally driven, the forward rotating blades 22 fixed to the outer circumference of the outer tube 13 and the sun gear 15 fixed to the lower end of the outer tube also rotate at the same time. Sun gear 1
When 5 rotates, the ring gear 17 tries to rotate via the planetary gears 16a and 16b.
Since it does not rotate due to the reaction force received by 8, the reverse rotation blade 21 rotates in the opposite direction to the forward rotation blade 22.

As a result, the cement milk supplied from the inner pipe 12 and discharged into the soil from the cement milk discharge port 23 is well mixed by the forward and reverse rotating both blades.

[0015]

[Effect] When this device drive-penetrates into the ground, the earth and sand excavated and rotated mixes with the cement milk, but tries to crawl with the rotor blades. However, since the fixed blade in the middle is stationary, the rotating earth and sand are sheared between the fixed blade and the rotating blade, and are forcibly stirred. That is, the earth and sand that are sheared and agitated by the rotary blade and the fixed blade are finely sheared.

[Brief description of drawings]

FIG. 1 shows a stirring and mixing shaft according to the present invention.

FIG. 2 is a cross-sectional view of a portion of a fixed blade of a stirring and mixing shaft.

3 is a sectional view taken along arrow A in FIG. 2 in the right half, and a sectional view taken along arrow B in the left half.

FIG. 4 is a diagram showing an embodiment of a stirring and mixing shaft in soil.

FIG. 5 is a known single-axis stirring / mixing shaft.

FIG. 6 is a known two-shaft type stirring and mixing shaft.

[Explanation of symbols]

 10 Leader 11 Stirring Mixing Shaft 12 Inner Tube 13 Outer Tube 14 Rod Guide 15 Sun Gear 16a, 16b Planetary Gear 17 Ring Gear 18 Fixed Blade 19 Holding Block 20 Lower Body 21 Reverse Rotating Blade 22 Forward Rotating Blade 23 Discharge Port 24 Cement Plant 25 Flow meter 26 Supply pipe 27 Drive shaft 28a, 28b Rotor vane 29 Stationary vane 29 'Connecting member 30 Cement milk injection pipe 31 Cement milk discharge port 32 Ogre motor 33 Ogre drive reducer 34 Drilling bit

Claims (1)

(57) [Scope of utility model registration request] 1. A stirrer / mixer shaft has a double structure of an inner pipe serving as a cement milk supply passage and an outer pipe rotatable around the inner pipe, and a forward rotating blade is provided on the outer periphery of the lower portion of the outer pipe. The sun gear is attached to the lower end of the pipe, and the sun gear is connected to the inner gear through a planetary gear, and the outer gear is meshed with a ring gear having internal teeth having fixed blades longer than the normal rotation blade, and the planetary gear shaft is rotatable with respect to the inner pipe. A mixing and mixing shaft for a ground improvement machine, which is attached to the upper part of a lower body equipped with a reversing blade of the same size as a normal rotating blade on the outer periphery.