JP2021038612A - Ground agitating device - Google Patents

Abstract

To suppress an agitating plate from rotating in an unintended direction even if a rotation shaft is repeatedly rotated forward and backward.SOLUTION: A ground agitating device comprises: a support arm attached to a tip of a movable arm; a rotating shaft provided at a tip of the support arm that can rotate in one direction, as well as, in a direction opposite to the one direction; a plurality of agitating blades provided at both ends of the rotating shaft, which rotate with the rotation of the rotating shaft to excavate and agitate the soil; and an agitating plate mounted on the rotating shaft and bent in a dogleg shape. The agitating plate has one end extending linearly and the other end bent with respect to one end, and has a first wall portion and a second wall portion on a main surface of the agitating plate on a side far from the rotation shaft.SELECTED DRAWING: Figure 4

Description

The present invention relates to a ground agitator for strengthening soft ground and the like by stirring and mixing soil and a soil modifier such as cement milk while excavating the ground.

Conventionally, as a ground agitation device for strengthening the ground, for example, as shown in Patent Document 1, a agitation plate is provided on a rotating shaft so that the lower extension portion of the support arm can be sufficiently excavated and agitated. Stirrers are known.
Specifically, the ground agitator described in Patent Document 1 is configured as follows.
A plurality of stirring blades are radially provided at both ends of a rotating shaft provided at the tip of the support arm, and the stirring blades rotate around the rotating shaft to excavate and stir the soil. At this time, the soil and a soil modifier such as cement milk are stirred and mixed to improve the ground of the soft soil.
A support column is attached to the rotating shaft, and a stirring plate is rotatably attached to the support column. When this rotating shaft rotates and the tip of one end of the stirring plate comes into contact with the support arm, the stirring plate rotates so as to be oblique to the rotating shaft. When the rotating shaft further rotates and the tip of one end of the stirring plate does not come into contact with the support arm, the stirring plate rotates so as to be parallel to the rotating shaft. When the rotation shaft rotates in this state, the stirring plate passes through the soil of the lower extension portion of the support arm, so that the soil of the lower extension portion is excavated and stirred.

Japanese Unexamined Patent Publication No. 2008-75344 (Fig. 4, etc.)

In such a conventional ground agitator, the axis of rotation rotates in one direction, and the soil and the soil modifier are agitated by a plurality of agitating blades and agitating plates.
The present inventor has found that in order to improve the stirring efficiency of soil and the like, it is preferable to repeatedly rotate the rotation axis in the forward and reverse directions (reversal).

An object of the present invention is to provide a ground stirring device having a structure of a stirring plate suitable for repeatedly performing forward rotation and reverse rotation of a rotating shaft.

(1) The first aspect of the present invention includes a support arm attached to the tip of a movable arm and a support arm.
A rotating shaft provided at the tip of the support arm, which can rotate in one direction and in the opposite direction to the one direction.
A plurality of stirring blades provided at both ends of the rotating shaft and rotating with the rotation of the rotating shaft to excavate and stir the soil.
A stirring plate mounted on the rotating shaft and bent in a dogleg shape is provided.
The stirring plate has one end extending linearly and the other end bent with respect to the one end, and has a first wall portion and a first wall portion on the main surface of the stirring plate on the side far from the rotation axis. Has 2 walls
The first wall portion is provided along the outer side edge of the other end, the second wall portion is adjacent to the first wall portion, and the other end of the first wall portion. Extends from the tip side of the
When the rotating shaft rotates in the one direction, the stirring plate rotates with the rotation of the rotating shaft, and when one end of the rotating shaft comes into contact with the support arm, it rotates in the first direction and the rotating shaft. When the rotation shaft rotates further and one end of the rotation shaft escapes from the contact with the support arm, the rotation shaft rotates in the second direction due to the reaction force of the soil and becomes the rotation shaft. When it rotates in a parallel state and passes through the lower extension portion of the support arm with one end parallel to the rotation axis, the soil in the lower extension portion of the support arm is agitated.
When the rotating shaft rotates in the opposite direction, the stirring plate is a ground stirring device that rotates in the first direction so as not to come into contact with the support arm.

(2) A second aspect of the present invention includes a support arm attached to the tip of a movable arm and a support arm.
A rotating shaft provided at the tip of the support arm, which can rotate in one direction and in the opposite direction to the one direction.
A plurality of stirring blades provided at both ends of the rotating shaft and rotating with the rotation of the rotating shaft to excavate and stir the soil.
A stirring plate mounted on the rotating shaft and bent in a dogleg shape is provided.
The stirring plate has one end extending linearly and the other end bent with respect to the one end, and has a wall portion on the main surface of the stirring plate on the side far from the rotation axis.
The wall portion extends from the tip end side of the other end toward the inner side edge of the one end.
When the rotating shaft rotates in the one direction, the stirring plate rotates with the rotation of the rotating shaft, and when one end of the rotating shaft comes into contact with the support arm, it rotates in the first direction and the rotating shaft. When the rotation shaft rotates further and one end of the rotation shaft escapes from the contact with the support arm, the rotation shaft rotates in the second direction due to the reaction force of the soil and becomes the rotation shaft. When it rotates in a parallel state and passes through the lower extension portion of the support arm with one end parallel to the rotation axis, the soil in the lower extension portion of the support arm is agitated.
When the rotating shaft rotates in the opposite direction, the stirring plate rotates in the first direction so as not to come into contact with the support arm.
It is a ground agitator.

(3) In the ground agitator of the above (1), it is preferable that the second wall portion is curved inward.

(4) In the ground agitator of the above (2), it is preferable that the wall portion is curved with respect to the inside.

(5) In any of the above-mentioned ground stirring devices (1) to (4), it is preferable that the rotating shaft is provided with a support column for attaching the stirring plate.

(6) In any of the above-mentioned ground stirring devices (1) to (5), it is preferable that the rotating shaft is provided with a guide member for sliding the stirring plate.

(7) In any of the above (1) to (6), it is preferable that the ground stirring device is provided with a stopper for limiting the rotation of the stirring plate.

According to the present invention, it is possible to prevent the stirring plate from rotating in an unintended direction even if the rotation shaft is repeatedly rotated forward and backward (reversed).

It shows the whole structure of the ground agitation apparatus of the 1st Embodiment of this invention. It is explanatory drawing of the stirring operation using the ground stirring device of 1st Embodiment of this invention. It is a top view which shows the structure of the stirring plate in the ground stirring device of 1st Embodiment of this invention. FIG. 5 is an exploded perspective view used for explaining the attachment of a stirring plate in the ground stirring device according to the first embodiment of the present invention. It is a perspective view used for the description of the stirring blade and the stirring plate in the ground stirring device of the embodiment of the present invention when the rotating shaft rotates in the normal direction. It is a perspective view used for the description of the stirring blade and the stirring plate in the ground stirring device of the embodiment of the present invention when the rotating shaft rotates in the normal direction. It is a perspective view used for the description of the stirring blade and the stirring plate in the ground stirring device of the embodiment of the present invention when the rotation axis is reversed. It is explanatory drawing of the rotation position of the stirring plate in the ground stirring device of the 1st Embodiment of this invention when a rotating shaft rotates forward. It is a figure for demonstrating the force applied to the stirring plate in the ground stirring apparatus of 1st Embodiment of this invention, and the rotation of a stirring plate when a rotation shaft rotates forward. It is explanatory drawing which shows the change of the force applied to the stirring plate at each rotation position of the stirring plate in the ground stirring device of the 1st Embodiment of this invention when a rotation shaft rotates forward. It is explanatory drawing which shows the change of the force applied to the stirring plate at each rotation position of the stirring plate in the ground stirring device of the 1st Embodiment of this invention when a rotation shaft rotates forward. It is a figure for demonstrating the force and rotation applied to the stirring plate 7 at the time of reversal when the rotation shaft reverses. It is a top view which shows the structure of the stirring plate in the ground stirring device of 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First Embodiment)
FIG. 1 shows the overall configuration of the ground agitator according to the first embodiment of the present invention. In FIG. 1, a movable arm 2 is extended to the work vehicle 1. The movable arm 2 includes arms 2a and 2b that are foldably connected. A support arm 3 is attached to the tip of the movable arm 2. The support arm 3 can be moved vertically and vertically with respect to the ground by operating the movable arm 2.

A rotating shaft 4 is attached to the tip of the support arm 3. As shown in FIG. 1, a plurality of stirring blades 6a to 6c protruding radially are provided on one of the rotating shafts 4 extending to the left and right, and a stirring plate 7 is attached. On the other side of the rotating shaft 4, a plurality of stirring blades 6d to 6 g that project radially are provided. These stirring blades 6a to 6c and 6d to 6g perform excavation and stirring of soil, and the tips of the stirring blades 6a to 6c and 6d to 6g are formed in a comb-like shape.

The stirring plate 7 excavates and stirs the lower extension portion of the support arm 3. The stirring plate 7 is rotatably attached to one of the rotating shafts 4. The stirring plate 7 may be rotatably attached to both of the rotating shafts 4. As described above, it is more preferable to attach to both of the rotating shafts 4 because the excavation speed increases. The function of the stirring plate 7 will be described later.

In FIG. 1, a rotation mechanism such as a motor, a chain, or a sprocket (not shown) is provided in the support arm 3. By this rotation mechanism, the rotation shaft 4 is rotated, and the stirring blades 6a to 6c and 6d to 6g are rotated accordingly. The direction of rotation can be forward and reverse.

FIG. 2 is an explanatory diagram of a stirring operation using the ground stirring device according to the first embodiment of the present invention. When strengthening the ground of soft soil, the tip of the support arm 3 is positioned above the soil 20 as shown in FIG. 2 (A). Then, as shown in FIG. 2B, the support arm 3 is moved downward by driving the movable arm 2 while rotating the stirring blades 6a to 6c and 6d to 6g. When the support arm 3 is moved downward, the soil 20 is excavated by the stirring blades 6a to 6c and 6d to 6g as the support arm 3 moves. At this time, a soil modifier such as cement in the form of a slurry or powder is guided from the work vehicle 1 to the tip of the support arm 3 (not shown). This soil modifier is discharged into the ground from the tip of the support arm 3. As a result, the soil and the soil modifier are agitated and mixed while the soil is excavated.

As described above, in the ground stirring device of the embodiment of the present invention, a plurality of stirring blades 6a to 6c and 6d to 6g are radially arranged at both ends of the rotating shaft 4 provided at the tip of the support arm 3. By rotating these stirring blades 6a to 6c and 6d to 6g, the soil can be agitated while being excavated to improve the ground of soft soil.

Further, in the embodiment of the present invention, the stirring plate 7 is rotatably attached to one side 4a of the rotating shaft 4. By rotating the stirring plate 7 in conjunction with the rotating shaft 4, the lower extension portion of the support arm 3 can be stirred.

FIG. 3 is a plan view showing the configuration of a stirring plate in the ground stirring device according to the first embodiment of the present invention.

The stirring plate 7 is bent in a dogleg shape, and has one end 11 extending linearly and the other end 12 bent with respect to the one end 11. The reason why the other end side of the stirring plate 7 is bent is that when one end side of the stirring plate no longer contacts the support arm 3, the other end side is in a parallel state due to the reaction force received from the soil. This is to return to. The "<" shape is not limited to the shape in which a corner is formed at the boundary between one end 11 and the other end 12, and the boundary between the one end 11 and the other end 12 is curved so as to draw an arc. Is also included.

The stirring plate 7 has a first wall portion 9a and a second wall portion 9b on the main surface 7a of the stirring plate 7 on the side farther from the rotating shaft 4. The second wall portion 9b corresponds to the second wall portion or the wall portion.
The first wall portion 9a is provided along the outer side edge 13 of the other end 12, and the second wall portion 9b is adjacent to the first wall portion 9a and is one end 11 from the tip side of the other end 12. Extends towards the inner side edge 14 of. The first wall portion 9a is linear, but is not limited to the linear shape, and is provided according to the shape of the outer side edge 13 of the other end 12. The second wall portion 9b is curved in an arc shape with respect to the inside, but may be curved in a dogleg shape. The second wall portion 9b may be linear, but may be arcuate or arcuate so that the stirring plate 7 can easily receive the reaction force received from the soil (in order to increase the pressure receiving area) in the retracted state described later. It is preferable that it is curved in a "<" shape.
In FIG. 3, the first wall portion 9a and the second wall portion 9b are formed apart from each other, but the first wall portion 9a and the second wall portion 9b are formed to be constant. May be done.

The height of the first wall portion 9a and the second wall portion 9b from the main surface 7a is determined by the area that receives the reaction force of the soil. The height of the first wall portion 9a and the height of the second wall portion 9b are set to be the same, but the height of the first wall portion 9a and the height of the second wall portion 9b may be different. ..
The tip extending toward the inner side edge 14 of one end 11 of the second wall portion 9b may extend beyond the boundary between the one end 11 and the other end 12, and the length of the second wall portion 9b is not particularly limited. , The length is set to be the same as the length of the first wall portion 9a or longer than the length of the first wall portion 9a. Assuming that the length of the first wall portion 9a is x1 and the length of the second wall portion 9b (length of the arc) is x2, the length x2 is preferably about 1 to 1.5 times the length x1. Here, "inside" refers to the side where the angle between one end 11 and the other end 12 of the stirring plate 7 can be seen as an acute angle, and "outside" means the angle between one end 11 and the other end 12 of the stirring plate 7. The side that looks obtuse.

In the first wall portion 9a, when the rotation shaft 4 rotates in one direction (when it rotates in the normal direction), one end 11 of the stirring plate 7 is rotated by the reaction force of the soil that hits the first wall portion 9a. It is provided to help rotate the stirring plate 7 so that it is parallel to the stirring plate 7. When one end of the stirring plate 7 passes through the lower extension portion of the support arm 3 in a state parallel to the rotation shaft 4, the stirring plate 7 stirs the soil in the lower extension portion of the support arm 3.

On the other hand, the second wall portion 9b has a second wall portion 9b so that one end 11 of the stirring plate 7 does not hit the support arm 3 when the rotating shaft 4 rotates in the direction opposite to one direction (when the rotating shaft 4 reverses). It is provided to help the stirring plate 7 to rotate by the reaction force of the soil that hits the wall portion 9b of the wall portion 9b, to store the stirring plate 7, and to keep the stored state. When the rotating shaft 4 reverses, the force applied to the stirring plate 7 is reversed due to the reaction force of the soil as compared with the case where the rotating shaft 4 rotates in the normal direction.

It is the reaction force of the soil on the side surfaces of the first wall portion 9a and the second wall portion 9b that can help the first wall portion 9a and the second wall portion 9b to rotate the stirring plate 7. This is because the area that receives the reaction force of the soil increases as compared with the case where the first wall portion 9a and the second wall portion 9b do not exist. In particular, when the stirring plate 7 reaches the retracted state or the retracted state described later, the reaction force received by the stirring plate 7 from the soil becomes weaker than when the stirring plate 7 is in a state parallel to the rotation axis 4. Therefore, the second wall portion 9b is provided so that the other end 12 is susceptible to the reaction force received from the soil. Although the first wall portion 9a is not provided in Patent Document 1, it is preferable to provide the first wall portion 9a so as to easily receive a reaction force received from the soil as in the present embodiment.

The rotation of the rotating shaft 4 in one direction so that the stirring plate 7 stirs the soil in the lower extension portion of the support arm 3 is called normal rotation of the rotating shaft, and the rotating shaft is stored so that the stirring plate 7 is stored. The rotation of 4 in the direction opposite to one direction is said to reverse the axis of rotation.

The stirring plate 7 has a plate shape, and the stirring plate 7 is formed with holes 10. The position of the hole 10 is L2> L1 where L1 is the distance from the hole 10 of the stirring plate 7 to the tip 11a of one end 11 thereof, and L2 is the distance from the hole 10 to the tip 12a of the other end 12 of the stirring plate 7. Yes, and it is set to about L2 = (1.5 to 2) × L1. Further, the distance L1 is set to a length at which the tip end 11a of one end 11 of the stirring plate 7 sufficiently reaches the lower extension portion of the support arm 3 when the stirring plate 7 is attached to the support pillar 16.

Further, in FIG. 3, the tip 11a of the stirring plate 7 has a sharp apex, but may be formed so as to be rounded. This is because when the stirring plate 7 rotates in the normal direction, one end 11 of the stirring plate 7 comes into contact with the support arm 3 to facilitate sliding on the axial side surface 3a of the support arm 3. If sliding is possible, the tip 11a of the stirring plate 7 does not have to be sharpened or rounded.

FIG. 4 shows the mounting mechanism of the stirring plate 7. As shown in FIG. 4, the support column 16 is fixed on one of the rotating shafts 4a of the rotating shaft 4. A plate 21 is provided on the support column 16. A guide member 15 is provided on the plate 21. A female screw 19 is provided on the support column 16. Further, the plate 21 is provided with a stopper 17 for limiting the rotation range of the stirring plate 7. The guide member 15 supports the stirring plate 7 so that the stirring plate 7 rotates smoothly without rattling. The stopper 17 does not rotate any more when the stirring plate 7 rotates due to the reaction force of the soil when the rotation axis rotates in the normal direction and one end 11 becomes parallel to the rotation axis 4. The rotation of the stirring plate 7 is regulated. Further, in the stopper 17, the stirring plate 7 was rotated (reversed) in the direction opposite to the normal rotation of the rotating shaft due to the reaction force of the soil when the rotating shaft was reversed, and the stirring plate 7 was released from the retracted state. Occasionally, the rotation of the stirring plate 7 is restricted so that it does not rotate any further.
The stirring plate 7 is arranged so that one end 11 faces the support arm 3 side and the other end 12 faces the stirring blade side 6a to 6c, and the male screw 18 rotatably attaches to the female screw 19 of the support column 16. It is attached. In the present embodiment, the stirring plate 7 is described to be attached to the female screw 19 of the support column 16 by the male screw 18, but this attachment method is not limited to such a structure, and the male screw 18 is attached. It may be directly bonded to the support column 16 by welding or the like.
In FIGS. 5 to 12 used in the following description, the plate 21, the guide member 15, the first wall portion 9a and the second wall portion 9b are omitted, and the stopper 17 is shown as necessary.

The outline of the operation of the stirring plate 7 when the rotating shaft rotates in the normal direction will be described with reference to FIGS. 5 and 6. 5 and 6 are perspective views used for explaining the stirring blade and the stirring plate in the ground stirring device according to the embodiment of the present invention when the rotation axis rotates in the normal direction. As shown in FIGS. 5 and 6, the stirring plate 7 rotates in the direction of arrow F in conjunction with the rotating shaft 4. As shown in FIG. 5 (A), the rotating shaft 4 rotates from the state where the support pillar 16 is located on the front side side of the drawing to the state where the support pillar 16 is located on the lower side of the drawing as shown in FIG. 5 (B). Then, since the stirring plate 7 passes through the soil in the lower extension portion of the support arm 3, the soil in the lower extension portion of the rotating shaft 4 is excavated and stirred.

Then, in the case of FIG. 6A, the stirring plate 7 excavates and stirs the soil in the lateral portion on the back side of the support arm 3. On the other hand, the rotating shaft 4 rotates, and as shown in FIG. 6B, the tip end 11a of one end 11 of the stirring plate 7 rotates to a position where the tip 11a of the one end 11 of the stirring plate 7 contacts the rotating shaft side surface 3a of the shaft side side surface 3a of the support arm 3. When the stirring plate 7 comes into contact with the rear surface 3a of the support arm 3, the stirring plate 7 rotates counterclockwise in the A1 direction because its movement is blocked by the support arm 3. In this way, as the stirring plate 7 rotates counterclockwise in the A1 direction, the tip end 11a of one end 11 of the stirring plate 7 stays in contact with the support arm 3 and follows the axial side surface 3a of the support arm 3 in the locus Y. Maintain its rotation while sliding in such a manner.

Next, an outline of the operation of the stirring plate 7 when the rotating shaft 4 is reversed will be described with reference to FIG. 7. FIG. 7 is a perspective view used for explaining the stirring blade and the stirring plate in the ground stirring device according to the embodiment of the present invention when the rotating shaft 4 is reversed. As shown in FIG. 7, the stirring plate 7 rotates in the direction of arrow R in conjunction with the rotation shaft 4. As shown in FIG. 7, when the stirring plate 7 is reversed in the A1 direction, placed on the guide member 15 and further rotated, and the rotation of the stirring plate 7 is regulated by the stopper 17 (not shown), the stirring plate 7 is further rotated. Does not rotate and is stored. The stored state is shown in FIG. 12B, which will be described later. This stored state is maintained while the rotating shaft 4 is reversed, and when the rotating shaft is switched from the reverse rotation to the normal rotation, the operation shifts to the operation shown in FIGS. 5 and 6.
Next, the operation of the stirring plate 7 when the rotating shaft rotates in the normal direction and the operation of the stirring plate 7 when the rotating shaft rotates in the reverse direction will be described in more detail.

<Operation of stirring plate 7 during normal rotation>
First, the operation of the stirring plate 7 when the rotating shaft rotates in the normal direction will be described in more detail.

FIG. 8 is an explanatory view of the rotation position of the stirring plate 7. The stirring plate 7 rotates in the direction of arrow F as described above. When the rotating shaft 4 rotates, the stirring plate 7 moves from the rotating position (a) → (b) → (c) → (d) → (e) → (f) → (g) → (as shown in FIG. It rotates in the order of h).

Here, the rotation position (a) indicates when the tip 11a of the stirring plate 7 is located in the right lateral direction of the drawing with respect to the support arm 3 (state of FIG. 5A), and the rotation position (c). Indicates when the tip 11a of the stirring plate 7 is located downward toward the support arm 3 (state in FIG. 5B), and in the rotation position (b), the tip 11a of the stirring plate 7 is in the rotation position. The state when it is located between (a) and (c) is shown, and the rotation position (e) is when the tip 11a of the stirring plate 7 is located in the left lateral direction of the drawing toward the support arm 3. Shown (state of FIG. 6A), the rotation position (d) indicates a state when the tip 11a of the stirring plate 7 is located between the rotation positions (c) and (e), and the rotation position (d). g) shows a state when the tip 11a of the stirring plate 7 is located in the upward direction in the drawing toward the support arm 3 (state in FIG. 6B), and the rotation position (f) is the state of the stirring plate 7. The state when the tip 11a is located between the rotation positions (e) and (g) is shown, and the rotation position (h) is such that the tip 11a of the stirring plate 7 is between the rotation positions (g) and (a). It shows the state when it is located in. In FIG. 8, the angle θ between the rotation positions (f) and (h) is the angle while the tip 11a of the stirring plate 7 is in contact with the support arm 3, as will be described later. The angles θ of the rotation position (f) and the rotation position (h) change depending on the lateral width H of the support arm 3, and do not have a constant value.

FIG. 9 is a diagram for explaining the force and rotation applied to the stirring plate 7. In FIG. 9, when the rotation shaft 4 rotates in the direction of the arrow F and the stirring plate 7 comes to the rotation position (f) in FIG. 8, the tip 11a of one end 11 of the stirring plate 7 comes into contact with the support arm 3. Therefore, at the time of contact, as shown in FIG. 9A, the tip 11a of one end 11 of the stirring plate 7 receives a reaction force in the counterclockwise direction of arrow A1 (first direction), and the hole 10 Rotates around. The tip 11a of the stirring plate 7 rotates with the rotation of the rotating shaft 4 while in contact with the support arm 3 from the rotating position (f) to the rotating position (h). During this period, one end 11 of the stirring plate 7 forms a predetermined angle θ with the rotating shaft 4, and the tip 11a of the stirring plate 7 draws a locus Y shown in FIG. 6B in a state of being in contact with the support arm 3. Rotate to.

Further, when the stirring plate 7 comes to the position of the rotation position (h) in FIG. 8, the stirring plate 7 does not come into contact with the support arm 3, and the stirring plate 7 loses the reaction force from the support arm 3, so that the stirring plate becomes It tries to be parallel to the rotation axis 4. This principle will be described below. At the moment when the stirring plate 7 does not come into contact with the support arm 3, the stirring plate 7 is in a state as shown by the alternate long and short dash line in FIG. 9B. At this time, the side edge 13 of the other end side 12 of the stirring plate 7 comes into contact with the soil in a state of being parallel to the rotation axis 4. Therefore, a strong force F2 from the soil is applied to the side edge 13 of the other end 12 of the stirring plate 7 as shown by the two arrows. On the other hand, since the outer side edge on one end side of the stirring plate 7 (the side edge on the opposite side of the inner side edge 14) is inclined, the force F1 received at this portion is weaker than that of F2. Therefore, in FIG. 9B, the stirring plate 7 rotates in the direction indicated by the arrow A2 (second direction) and becomes parallel to the rotation axis 4 as shown by the solid line. At this time, the rotation of the stirring plate 7 is restricted by the stopper 17 of the guide member 15. Finally, the stirring plate 7 is in a state parallel to the rotation axis 4 as shown by the solid line in FIG. 9C. At this time, as shown in FIG. 3, if the stirring plate 7 is designed so that L2> L1 even without the first wall portion 9a, the force that the L1 portion of the stirring plate 7 receives from the soil. Since the force F2 received from the soil by the portion L2 of the stirring plate 7 and F1 is substantially the same, the stirring plate 7 maintains a state parallel to the rotation axis 4. However, if the first wall portion 9a is provided, the pressure receiving area of the L2 portion of the stirring plate 7 becomes larger than the pressure receiving area of the L1 portion of the stirring plate 7, and the stirring plate 7 presses against the stopper 17. Works, and the stirring plate 7 can maintain a more stable state parallel to the rotating shaft 4.

Further, when the rotating shaft 4 rotates and the stirring plate 7 passes through the rotating positions (a) to (e) in FIG. 8, the stirring plate 7 is parallel to the rotating shaft 4 and the support arm 3 Pass below. At this time, the outer side edge of the one end side 11 of the stirring plate 7 (the side edge opposite to the inner side edge 14) and the side edge 13 of the other end side 12 advance against the soil, and FIG. 9C shows. As a whole, it receives forces F1 and F2 from the soil. In this way, in order to receive the forces F1 and F2 from the soil as a whole with respect to the stirring plate 7, the stirring plate 7 is supported while maintaining a state parallel to the rotation axis 4 as described above. It passes laterally and below the arm 3. In particular, when the stirring plate 7 passes through the rotational positions (b) to (d) in FIG. 8, the stirring plate 7 excavates and stirs the soil in the lower extension portion of the support arm 3.

10 and 11 are diagrams showing changes in the force applied to the stirring plate 7 when the stirring plate 7 is viewed from the direction of arrow S at each rotation position of the stirring plate 7. 10 and 11 will be described below assuming that the stirring blades 6a to 6c and 6d to 6g are rotating in the soil as shown in FIG. 2 (B). In the figure, X indicates that the stirring plate 7 is in contact with the support arm 3.

10 (A) to 10 (D) and 11 (A) are diagrams showing changes in the force applied to the stirring plate 7 when the stirring plate 7 is in the rotation positions (a) to (e) of FIG. .. In FIGS. 10 (A) to 11 (A), the rotating shaft 4 rotates, and the stirring plate 7 rotates in the following rotation positions (a) → (b) → (c) → (d) → (e). However, since the stirring plate 7 is located at a position away from the support arm 3, it is not in contact with the support arm 3. Therefore, when the stirring plate 7 is in the rotation positions (a) to (e), the stirring plate 7 has the side edge 13 on the other end side of the stirring plate and the outer side edge on the one end side of the stirring plate, respectively, from the soil. Forces F2 and F1 are applied. Since the first wall portion 9a is provided, the stirring plate 7 is pressed against the stopper 17 due to the difference in the pressure receiving area between the side edge 13 on the other end side of the stirring plate and the outer side edge on the one end side of the stirring plate. Since the force acts and the rotation is restricted by the stopper, the stirring plate 7 rotates while maintaining a state parallel to the rotation shaft 4.

When the rotating shaft 4 further rotates, the stirring plate 7 reaches the rotating position (f) as shown in FIG. 11 (B). At this time, the tip 11a of one end 11 of the stirring plate 7 comes into contact with the axial side surface 3a of the support arm 3. At this time, as described above, one end 11a of the stirring plate 7 rotates in the direction indicated by the arrow A1 and tilts with the stirring plate 7 in contact with the support arm 3. At this time, the side edge 13 on the other end side of the stirring plate is parallel to the rotation axis direction of the stirring plate 7, and the outer side edge on one end side of the stirring plate (the side edge on the opposite side of the inner side edge 14) is stirred. It is tilted in the direction of the rotation axis of the plate 7. Therefore, as shown by the two arrows, the force F2 applied to the side edge 13 on the other end side of the stirring plate is larger than the force applied to the outer side edge on the one end side of the stirring plate, and thus acts clockwise. Generates rotational force. However, since one end 11a of the stirring plate 7 is in contact with the axial side surface 3a of the support arm 3, the stirring plate 7 cannot rotate clockwise.

When the rotating shaft 4 further rotates, as shown in FIGS. 11B to 11D, between the rotating positions (f) to (h), one end 11a of the stirring plate 7 is a side surface 3a on the shaft side of the support arm 3. Rotate on the locus Y along the axial side surface 3a while in contact with. Even in this state, the side edge 13 on the other end side of the stirring plate is parallel to the rotation direction of the stirring plate 7, so that the force F2 applied to the side edge 13 on the other end side of the stirring plate has two arrows. As shown by, the force is larger than the force applied to the outer side edge on one end side of the stirring plate, and a rotational force acting in the clockwise direction is generated. However, the tip 11a of one end 11 of the stirring plate 7 is the axial side surface of the support arm 3. Since it is in contact with 3a, the stirring plate 7 cannot rotate clockwise.

Then, when the rotating shaft 4 further rotates, when the stirring plate 7 comes to the end of the rotation position (h), as shown in FIG. 11D, the tip 13a of the stirring plate 7 on the one end 11 side of the stirring plate 7 The contact with the shaft side side surface 3a of the support arm 3 is released. At this time, as described above, a strong force F2 from the soil is applied to the side edge 13 of the other end 12 of the stirring plate 7 as shown by the two arrows. On the other hand, since the outer side edge on one end side of the stirring plate 7 (the side edge on the opposite side of the inner side edge 14) is inclined, the force F1 received at this portion is weaker than that of F2. As a result, the stirring plate 7 rotates in the direction indicated by the arrow A2 (second direction) in FIG. 11D until it becomes parallel to the rotation axis 4 as shown by the solid line. As described above, while the stirring plate 7 rotates in the order of rotation position (a) → (b) → (c) → (d) → (e), the stirring plate 7 is rotated, and the stirring plate 7 is rotated. Rotate while maintaining a state parallel to 4.

As described above, the stirring plate 7 rotates in the direction indicated by the arrow A1 until the stirring plate 7 contacts the support arm at the rotation position (f) and no contact with the support arm at the rotation position (h). Move and maintain its position. Therefore, during this period, the stirring plate 7 is in a state of being rotated diagonally.

On the other hand, when the stirring plate 7 is not in contact with the support arm, the other end 12 of the stirring plate 7 is connected to the rotating shaft 4 as shown in FIGS. 10A to 10D and 11A. It is almost parallel. Therefore, in the present invention, when the stirring plate 7 rotates in a state substantially parallel to the rotation shaft 4 in this way, the stirring plate 7 passes through the soil of the lower extension portion of the support arm 3, and the soil is excavated and stirred. Is done.

<Operation of stirring plate 7 during reversal>
When the rotating shaft 4 is switched from normal rotation to reverse rotation, the stirring plate 7 is in the normal rotation state in any of the rotation positions (a) to (h) in FIG. 8, and after the reverse rotation, the stirring plate 7 is in FIG. 7. It rotates so as to shift to the stored state of the stirring plate 7 shown in 1. Hereinafter, as an example, a case where the rotating shaft 4 is switched from normal rotation to reverse rotation when the stirring plate 7 passes through the rotation positions (a) to (e) in FIG. 8 will be described. As described above, FIG. 9C shows the force and rotation applied to the stirring plate 7 when the stirring plate 7 passes through the rotation positions (a) to (e) in FIG. 8 when the rotating shaft 4 rotates in the normal direction. It is a figure for demonstrating the movement.
FIG. 12 is a diagram for explaining the force and rotation applied to the stirring plate 7 when the rotating shaft 4 is reversed. FIG. 12A shows a state when the rotation axis 4 is switched from the arrow F direction of FIG. 9C to the arrow R direction. The forces F1 and F2 from the soil applied to the stirring plate 7 shown in FIG. 9C are applied in the opposite directions of the stirring plate 7 in FIG. 12A. Since the stirring plate 7 is provided with the second wall portion 9b, a stronger force acts on the portion L2 than the portion L1 of the stirring plate 7. Therefore, the stirring plate 7 rotates in the direction of the arrow A1 (first direction), which is counterclockwise around the hole 10.

When the stirring plate 7 rotates to the position shown in FIG. 12B, the rotation of the stirring plate 7 is restricted by the stopper 17, so that the stirring plate 7 does not rotate any more and is in the retracted state. In the stored state, since the stirring plate 7 is in a state close to parallel to the rotation direction of the rotation axis, the reaction force of the soil applied to one end 11 is weak, but the side surface of the second wall portion 9b is stronger than the soil. More reaction force is applied. Therefore, the rotation of the stirring plate 7 from the stored state to the support arm 3 is suppressed, and the stored state is stably maintained. This stored state is maintained while the rotating shaft is reversed, and when the rotating shaft is switched from reverse rotation to normal rotation, the operation shifts to the operation shown in FIGS. 5 and 6.

According to the present embodiment described above, similarly to Patent Document 1, a support arm attached to the tip of the movable arm, a rotation shaft provided at the tip portion of the support arm, and both ends of the rotation shaft are provided. The stirring plate comprises a plurality of stirring blades that rotate with the rotation of the rotating shaft to excavate and stir the soil, and a stirring plate mounted on the rotating shaft and bent in a dogleg shape. It rotates with the rotation of the rotating shaft, and when one end of the rotating shaft comes into contact with the support arm, it rotates in the first direction and rotates in a state of being inclined with respect to the rotating shaft, and the rotating shaft further rotates, and the stirring plate When one end escapes contact with the support arm, the reaction force of the soil causes it to rotate in the second direction and rotate in a state parallel to the rotation axis. Can excavate and stir.
Further, according to the present embodiment, it is possible to prevent the stirring plate from rotating in an unintended direction even if the rotation shaft is repeatedly rotated forward and backward (reversed).

Further, according to the present embodiment, since the rotating shaft is provided with a support column for attaching the stirring plate and the stirring plate is provided on the support column, the rotation radius of the stirring plate is substantially the same as the rotation radius of the stirring blade. As a result, the stirring plate can excavate a part of the soil left behind by the stirring blade.

Further, according to the present embodiment, since the guide member for sliding the stirring plate is provided on the rotating shaft, the stirring plate can be smoothly rotated without rattling.

Further, according to the present embodiment, since the guide member is provided with a stopper for restricting the rotation of the stirring plate, the stirring plate can be returned to a state parallel to the rotation axis.

(Second Embodiment)
In the first embodiment, the stirring plate 7 has a first wall portion 9a and a second wall portion 9b. However, the stirring plate 7 may have only the second wall portion 9.
FIG. 13 is a plan view showing the configuration of a stirring plate in the ground stirring device according to the second embodiment of the present invention. Since the configuration of the ground stirring device excluding the stirring plate is the same as that of the first embodiment, the description of the components other than the stirring plate will be omitted.
As shown in FIG. 13, the stirring plate 7A of the present embodiment has only the second wall portion 9b.

Since the stirring plate 7A does not have the first wall portion 9a, one tip of the second wall portion 9b is arranged so as to be close to the outer side edge 13 of the other end 12. Similar to the first embodiment, it extends from the tip end side of the other end 12 toward the inner side edge 14 of the end 11.
The second wall portion 9b of the present embodiment receives the reaction force of the soil in both the forward rotation and the reverse rotation of the rotation axis. However, with respect to the first wall portion 9a provided along the outer side edge 13 of the other end 12, the second wall portion 9b of the present embodiment is relative to the outer side edge 13 of the other end 12. Since the ends 11 are provided so as to be separated from each other toward the inner side edge 14, the reaction force of the soil received by the second wall portion 9b during the normal rotation of the rotating shaft is the reaction force of the soil received by the first wall portion 9a during the normal rotation of the rotating shaft. It is smaller than the reaction force of the soil that is received.

The present invention is not limited to the above-described embodiment, and various modifications and applications are possible without departing from the gist of the present invention.

For example, in the above-described embodiment, three stirring blades 6a to 6c are arranged at intervals of 90 degrees on one of the rotating shafts 4 extending to the left and right, and 90 on the other rotating shaft 4b. Four stirring blades 6d to 6 g are arranged at intervals of degrees, but the number and arrangement of the stirring blades are not limited to this. Further, in this example, the stirring plate 7 is attached to one rotating shaft 4a, but the stirring plate 7 may be attached to the other rotating shaft 4b.

Further, the stirring plate 7 of the above-described embodiment is not particularly limited to the ground stirring device shown in FIGS. 1 and 2, and for example, the ground stirring device described in Japanese Patent Application Laid-Open No. 2008-231691 can also be applied.

The ground agitation device described in Japanese Patent Application Laid-Open No. 2008-231691 is a ground agitation device capable of efficiently stirring earth and sand up and down, front and back, left and right.
Specifically, the ground stirring device described in Japanese Patent Application Laid-Open No. 2008-231691 is configured as follows.
The rotation of the hydraulic motor is transmitted to the first stirring body and the second stirring body by the chain mechanism. The first stirring body is a first unit stirring blade in which four stirring claws are diagonally arranged from the outside to the inside, and a second unit in which the four stirring claws are diagonally arranged from the inside to the outside. It has a stirring blade. The second stirring body is a third unit stirring blade whose four stirring claws are arranged diagonally from the outside to the inside, and a fourth stirring body in which the four stirring claws are arranged diagonally from the inside to the outside. It has a unit stirring blade and. Therefore, with the rotation of the first stirrer and the second stirrer, the earth and sand are moved not only in the vertical direction but also in the direction from the outside to the inside and the direction from the inside to the outside alternately. Is done. As a result, the earth and sand are sufficiently agitated in the vertical direction, the front-back direction, and the left-right direction.
In such a ground stirring device described in Japanese Patent Application Laid-Open No. 2008-231691, the stirring plate is placed between the first unit stirring blade and the second unit stirring blade, or with the third unit stirring blade. It can be provided between the fourth unit stirring blade and the same effect as the ground stirring device of the above-described embodiment.

INDUSTRIAL APPLICABILITY The present invention can be used as a ground agitator for strengthening soft ground or the like by stirring and mixing a solidifying material such as cement milk and soil while excavating the ground.

1 Work vehicle 2a, 2b Movable arm 3 Support arm 3a Shaft side side of support arm 4, 4a, 4b Rotating shafts 6a to 6c and 6d to 6g Stirring blades 7, 7A Stirring plate 7a Main surface 9a First wall 9b No. 2 Wall 10 Hole 11 One end of the stirring plate 11a One end of the stirring plate 12 The other end of the stirring plate 13 The outer side edge of the other end of the stirring plate 14 The inner side edge of the one end side of the stirring plate 15 Guide Member 16 Support pillar 17 Stopper 18 Male screw 19 Female screw 20 Soil 21 Plate

Claims (7)

The support arm attached to the tip of the movable arm and
A rotating shaft provided at the tip of the support arm, which can rotate in one direction and in the opposite direction to the one direction.
A plurality of stirring blades provided at both ends of the rotating shaft and rotating with the rotation of the rotating shaft to excavate and stir the soil.
A stirring plate mounted on the rotating shaft and bent in a dogleg shape is provided.
The stirring plate has one end extending linearly and the other end bent with respect to the one end, and has a first wall portion and a first wall portion on the main surface of the stirring plate on the side far from the rotation axis. Has 2 walls
The first wall portion is provided along the outer side edge of the other end, the second wall portion is adjacent to the first wall portion, and the other end of the first wall portion. Extends from the tip side of the
When the rotating shaft rotates in the one direction, the stirring plate rotates with the rotation of the rotating shaft, and when one end of the rotating shaft comes into contact with the support arm, it rotates in the first direction and the rotating shaft. When the rotation shaft rotates further and one end of the rotation shaft escapes from the contact with the support arm, the rotation shaft rotates in the second direction due to the reaction force of the soil and becomes the rotation shaft. When it rotates in a parallel state and passes through the lower extension portion of the support arm with one end parallel to the rotation axis, the soil in the lower extension portion of the support arm is agitated.
When the rotating shaft rotates in the opposite direction, the stirring plate rotates in the first direction so as not to come into contact with the support arm.
Ground agitator. The support arm attached to the tip of the movable arm and
A rotating shaft provided at the tip of the support arm, which can rotate in one direction and in the opposite direction to the one direction.
A plurality of stirring blades provided at both ends of the rotating shaft and rotating with the rotation of the rotating shaft to excavate and stir the soil.
A stirring plate mounted on the rotating shaft and bent in a dogleg shape is provided.
The stirring plate has one end extending linearly and the other end bent with respect to the one end, and has a wall portion on the main surface of the stirring plate on the side far from the rotation axis.
The wall portion extends from the tip end side of the other end toward the inner side edge of the one end.
When the rotating shaft rotates in the one direction, the stirring plate rotates with the rotation of the rotating shaft, and when one end of the rotating shaft comes into contact with the support arm, it rotates in the first direction and the rotating shaft. When the rotation shaft rotates further and one end of the rotation shaft escapes from the contact with the support arm, the rotation shaft rotates in the second direction due to the reaction force of the soil and becomes the rotation shaft. When it rotates in a parallel state and passes through the lower extension portion of the support arm with one end parallel to the rotation axis, the soil in the lower extension portion of the support arm is agitated.
When the rotating shaft rotates in the opposite direction, the stirring plate rotates in the first direction so as not to come into contact with the support arm.
Ground agitator. The ground stirring device according to claim 1, wherein the second wall portion is curved inward. The ground agitator according to claim 2, wherein the wall portion is curved with respect to the inside. The ground stirring device according to any one of claims 1 to 4, wherein a support column for attaching the stirring plate is provided on the rotating shaft. The ground stirring device according to any one of claims 1 to 5, wherein a guide member for sliding the stirring plate is provided on the rotating shaft. The ground stirring device according to any one of claims 1 to 6, wherein a stopper for limiting the rotation of the stirring plate is provided.

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