JP6198418B2 - Ground excavation and stirring device - Google Patents

Description

  The present invention relates to a ground excavation and agitation device for excavating the ground attached to a work vehicle and performing agitation and mixing of the excavated soil and a solidified material such as fluid cement to improve soft ground.

  Conventionally, as shown in FIG. 6, as this type of excavating and agitating device Sa, for example, a base body 100 attached to a work vehicle (not shown) and a protrusion projecting to the left and right of the base body 100 and rotating to the base body 100 And a plurality of excavating and stirring blades 102 projecting from the respective rotary heads 101. The rotary head 101 is driven by, for example, a hydraulic motor and rotated via a drive mechanism (not shown) built in the base body 100. The excavation stirring blade 102 is formed in a bar shape having a rectangular cross section, and is provided radially on the rotary head 101. Further, the excavation stirring blade 102 is detachably provided so that it can be exchanged when it is worn and performance is deteriorated.

  When performing excavation and agitation of the ground by the excavation and agitation device Sa, for example, the work vehicle is moved on the ground and the rotary head 101 is rotated while supplying the solidified material such as fluid cement, so that the excavation and agitation blades 102 are moved. The soil is put in the ground, and the soil of the ground is excavated, and the excavated soil and a solidified material such as fluid cement are agitated and mixed (see, for example, JP-A-7-11626 (Patent Document 1)).

JP-A-7-11626

By the way, in the conventional excavation and stirring apparatus Sa, the excavation and stirring blades 102 are formed in a bar shape with a rectangular cross section and the tip is rectangular, so that the rotational resistance is large, and therefore, there is a problem that the excavation and stirring blade 102 is easily broken or bent. there were.
The present invention has been made in view of the above-mentioned problems, and the ground is designed to improve the excavation performance even if the rotational resistance is reduced by reducing the rotational resistance as much as possible to suppress damage such as breakage and bending. An object of the present invention is to provide a drilling and stirring apparatus.

In order to achieve the above object, a ground excavation and agitation apparatus according to the present invention includes a base body attached to a work vehicle, and a pair of rotations provided to project from the left and right of the base body and rotatably supported by the base body. In a ground excavation and agitation device comprising a head and a plurality of excavation and agitation blades projecting from each rotary head,
The excavation stirring blade is configured to include a mountain-shaped claw body having a linear ridge line at the tip, and the ridge line of the claw body extends along a tangential direction of a circle around the rotation axis of the rotary head. The excavation stirring blade is provided in the rotary head.

  Thus, when excavating and stirring the ground, for example, while moving the work vehicle on the ground and supplying solidifying material such as fluid cement, the rotating head is rotated and the excavating and stirring blade is placed in the ground. The excavated soil and the solidified material such as fluid cement are agitated and mixed. In this case, the excavating stirring blade is provided with a claw body, in which the ridge line is along the tangential direction of the circle centering on the rotation axis of the rotary head, so that the rotational resistance is reduced, so that although it wears, it is broken. Damage such as bending and bending can be suppressed. Even if the rotational resistance decreases, the claw body has a mountain shape, and the tip corner portion is sharp. Therefore, it is easy to cut into the ground by digging well into the ground, so that the excavation performance can be improved.

  If necessary, the excavation stirring blade is configured to include a support member that is fixed to the rotary head and supports the claw body, and the claw body is detachably provided on the support member. When the nail body is worn out, it can be replaced with a new nail body, so that it is not necessary to replace the entire head, which saves labor and improves efficiency.

Further, if necessary, the claw body is provided with a pair of substantially triangular standing wall surfaces facing the circumferential direction of a circle centered on the rotation axis of the rotating head, and the ridgeline is formed continuously with the standing wall surface. A pair of inclined wall surfaces that are formed into a block shape, an engagement recess is formed on the base end side of the claw body, and an engagement protrusion that engages with the engagement recess of the claw body is formed on the support member. And forming the claw body with the engagement concave portion engaged with the engagement convex portion of the support member so that the claw body can be attached to the support member, and the wall portion and the engagement convex portion constituting the engagement concave portion of the claw body And a lock key that is inserted into the through hole and locks the engagement of the engagement recess with the engagement protrusion.
Thereby, since the nail | claw body was formed in the block shape, it becomes difficult to wear and durability is improved. Moreover, since the nail | claw body is a simple shape and can be produced comparatively cheaply, labor saving can be aimed at that much. Also, when replacing a worn claw body, remove the lock key, remove the worn claw body from the engaging projection in its engaging recess, and engage the new claw body with the engaging projection in its engaging recess. Finally, insert the lock key. In this case, since the nail body can be replaced by a simple operation, workability is improved.

  Further, if necessary, the support member is configured to include a fixing plate having a lateral width larger than the lateral width of the engaging convex portion, and the lateral width direction of the fixing plate is parallel to the ridge line of the claw body. A lower edge of the fixing plate is fixed to the rotary head by welding, and the engaging convex portion is provided with a convex main body and a pair of leg pieces that are connected to the convex main body and hold the fixing plate. The leg piece is inserted from the upper edge side into the approximate center of the fixing plate in the lateral width direction, and the fixing plate is clamped and attached to the fixing plate and fixed by welding. As a result, the fixing plate is welded and fixed to the rotary head so that the width direction of the fixing plate is parallel to the ridge line of the nail body. Therefore, as with the nail body having the ridge line, the rotational resistance is reduced. Damage such as bending can be suppressed. Further, since both end portions in the width direction of the fixing plate protrude from the width direction of the engaging convex portion, excavation can be performed also by the protruding portion of the fixing plate, and the excavation performance can be further improved.

  Furthermore, if necessary, the rotary head is formed in a substantially cylindrical shape having an outer peripheral surface and an outer end surface with the rotation axis as an axis, and the excavation stirring blade is predetermined on the outer peripheral surface along a predetermined spiral. A plurality of rows are arranged at intervals. Since the excavation stirring blades are arranged along the spiral, a plurality of excavation stirring blades are provided at predetermined intervals along the rotation axis when viewed from the direction orthogonal to the rotation axis. The excavation width along the axis is increased, and the excavation efficiency is improved accordingly.

  Further, if necessary, a plurality of the excavating and stirring blades are arranged on the outer end surface of the rotating head along a predetermined circumference at predetermined intervals. Since the side of the rotary head can also be excavated, the excavation range is increased and the excavation efficiency is improved accordingly.

  According to the present invention, the excavating and stirring blade includes a claw body, and in this claw body, its ridgeline is along the tangential direction of the circle centering on the rotation axis of the rotary head, so that the rotational resistance is reduced, and therefore the wear is reduced. It is possible to suppress damage such as breakage or bending. Even if the rotational resistance decreases, the claw body has a mountain shape, and the tip corner portion is sharp. Therefore, it is easy to cut into the ground by digging well into the ground, so that the excavation performance can be improved.

It is a figure which shows the excavation stirring apparatus of the ground which concerns on embodiment of this invention with the work vehicle with which this was mounted | worn. It is a side view which shows the excavation stirring apparatus of the ground which concerns on embodiment of this invention. It is a front view which shows the excavation stirring apparatus of the ground which concerns on embodiment of this invention. It is a disassembled perspective view which shows the excavation stirring blade of the ground excavation stirring apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the excavation stirring blade of the ground excavation stirring apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the conventional excavation stirring apparatus.

Hereinafter, a ground excavation and stirring device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the ground excavation and stirring device S according to the embodiment is attached to a work vehicle 1. As the work vehicle 1, a back-for vehicle is used, and a chassis 3 provided with a caterpillar 2, a chassis 4 provided rotatably on the chassis 3, a boom 5 provided swingably on the chassis 4, and a boom 5 And an arm 6 that is swingably connected to the arm 6. Then, instead of the back-for bucket, the excavation and stirring device S according to the present embodiment is attached to the tip of the arm 6.

  As shown in FIGS. 1 to 5, the excavation and agitation device S according to the embodiment includes a base body 10 made of metal (for example, iron) attached to the tip of the arm 6 of the work vehicle 1, and left and right of the base body 10. A pair of metal (for example, iron) rotary heads 11 that protrude and are rotatably supported by the base body 10, and a plurality of metal (for example, iron) excavation and stirring blades 20 that protrude from each rotary head 11. And is configured.

  The base body 10 is rotatably provided at the tip of the arm 6 and is rotated by the hydraulic drive unit 7 on the work vehicle 1 side so that the angle with respect to the arm 6 can be adjusted. In addition, a drive mechanism (not shown) for rotating the rotary head 11 by a hydraulic motor (not shown) is inserted into the base body 10. The rotary head 11 is formed in a substantially cylindrical shape having an outer peripheral surface 12 and an outer end surface 13 with the rotation axis P as an axis.

  As shown in FIG. 3, the excavation stirring blade 20 is provided so as to be mirror-symmetric with each other in each rotary head 11. First, a predetermined spiral (reference numeral 14 in FIG. 3) is provided on the outer peripheral surface 12 of the rotary head 11. Are arranged in a plurality of rows at predetermined intervals. In the embodiment, eight rotating heads 11 are provided. Accordingly, the excavating and stirring blades 20 are arranged in an equiangular relationship (at intervals of θ = 45 °) when viewed from the direction of the rotation axis P as shown in FIG. 2, and are orthogonal to the rotation axis P as shown in FIG. As viewed from the direction, they are arranged at a predetermined interval D along the rotation axis P.

  Further, as shown in FIG. 2, the excavation stirring blades 20 are arranged in a plurality of rows at predetermined intervals along a predetermined circumference (circle Qa) on the outer end surface 13 of the rotary head 11. In the embodiment, three are provided for each rotary head 11. Therefore, as shown in FIG. 2, the excavation stirring blade 20 is arranged in an equiangular relationship (α = 120 ° interval) when viewed from the direction of the rotation axis P.

  As shown in FIGS. 2 to 5, the excavation stirring blade 20 includes a mountain-shaped claw body 22 having a linear ridge line 21 at the tip, and the ridge line 21 of the claw body 22 is formed on the rotary head 11. The rotary head 11 is provided along the tangential direction of the circle Qb with the rotation axis P as the center. That is, in the excavation stirring blade 20 provided on the outer peripheral surface 12 of the rotary head 11, as shown in FIG. 2, the ridge line 21 of the claw body 22 is along the tangential direction of the circle Qb as viewed from the direction of the rotation axis P. Further, in the excavation and stirring blade 20 provided on the outer end surface 13 of the rotary head 11, as shown in FIG. 2, the ridge line 21 of the claw body 22 is along the tangential direction of the circle Qa as viewed from the direction of the rotation axis P.

  The excavation stirring blade 20 includes a support member 30 that is fixed to the rotary head 11 and supports the claw body 22, and the claw body 22 is detachably provided on the support member 30. Specifically, the claw body 22 is formed of a cast iron casting, and is a pair of substantially triangular shapes facing the circumferential direction of a circle (Qa, Qb) centered on the rotation axis P of the rotary head 11. The standing wall surface 23 and a pair of inclined wall surfaces 24 that are connected to the standing wall surface 23 to form the ridge line 21 are formed in a block shape. An engagement recess 25 made of a hole is formed on the base end side of the claw body 22.

  Further, the support member 30 has an engagement convex portion 31 that engages with the engagement concave portion 25 of the claw body 22 and an engagement convex portion that has a lateral width that is fixed to the rotary head 11 and is larger than the lateral width of the engagement convex portion 31. The fixing plate 32 that supports the portion 31 is provided. As shown in FIGS. 4 and 5, the engaging convex portion 31 is formed of an iron casting that is molded in the same manner as the claw body 22, and engages and engages with the engaging concave portion 25 of the claw body 22. A solid convex body 33 having substantially the same shape as the cavity of the concave portion 25, and a pair of leg pieces 34 that are connected to the convex body 33 and sandwich the fixing plate 32. Thereby, the claw body 22 can be attached to the support member 30 by engaging the engagement recess 25 with the protrusion main body 33 of the engagement protrusion 31 of the support member 30.

  The fixing plate 32 is formed in a rectangular plate shape, and the rotary head 11 is fixed by welding the lower edge 32a of the fixing plate 32 to the rotary head 11 so that the lateral width direction thereof is parallel to the ridge line 21 of the claw body 22. It is fixed to. Further, the leg piece 34 of the engaging convex portion 31 is inserted from the upper edge 32b side into the approximate center of the fixing plate 32 in the lateral width direction, and is attached to the fixing plate 32 by holding the fixing plate 32 and fixed by welding. Yes. Thereby, projecting portions 35 projecting from the width direction of the engaging convex portion 31 are formed at both ends in the width direction of the fixing plate 32.

  Furthermore, the engaging recess 25 of the claw body 22 and the wall portion on the standing wall surface 23 side and the engaging protrusion 31 are provided with through-holes 36 and 37 penetrating through the through-holes 36 and 37. Thus, a lock key 40 is provided for locking the engagement of the engagement protrusion 31 with the protrusion main body 33 in the engagement recess 25. On one side surface along the insertion direction of the lock key 40, a corrugated waveform locking portion 41 is formed. Further, the lock key 40 has a corrugated engaged portion 43 that engages with the corrugated engagement portion 41 of the lock key 40 when the lock key 40 is inserted into the through holes 36 and 37. A rubber member 42 that presses and presses 40 against the through holes 36 and 37 is attached. A holding hole 44 for holding the rubber member 42 is continuously formed in the through hole 37 formed in the convex body 33 of the engaging convex part 31.

  Therefore, in this excavation and agitation device S, when attaching the claw body 22 to the support member 30, first, as shown in FIGS. 4 and 5, first, in the holding hole 44 formed in the convex body 33 of the engaging convex portion 31. The rubber member 42 is held, and in this state, the engaging concave portion 25 of the claw body 22 is engaged with the convex portion main body 33, and then the lock key 40 is pushed into the through holes 36 and 37 with, for example, a hammer. As a result, the corrugated locking portion 41 of the lock key 40 and the corrugated locked portion 43 of the rubber member 42 are engaged with each other, and the lock key 40 is fixed to the through holes 36 and 37 by the elasticity of the rubber member 42. It is pressed and pressed, is prevented from coming off, and is firmly attached.

  When excavating and stirring the ground, as shown in FIG. 1, the work vehicle 1 is moved on the ground and the rotating head 11 is rotated while supplying a solidifying material such as fluid cement, for example. The wing 20 is put in the ground, and the ground soil is excavated, and the excavated soil and a solidified material such as fluid cement are mixed with stirring. In this case, as shown in FIGS. 2 and 3, the excavating and stirring blade 20 includes a claw body 22, in which the ridge line 21 is a circle (Qa, Qb) around the rotation axis P of the rotary head 11. ) Along the tangential direction, the rotational resistance is reduced, so that damage such as breakage or bending can be suppressed although wear occurs. Even if the rotational resistance is reduced, the claw body 22 has a mountain shape, so that the corner at the tip is sharp. Therefore, it is easy to cut the soil by biting into the ground well, so that the excavation performance can be improved. . Moreover, since the nail | claw body 22 is formed in the block shape, it becomes difficult to wear and durability is improved.

  The support member 30 also functions during excavation and stirring. In this case, since the fixing plate 32 is welded and fixed to the rotary head 11 so that the lateral width direction thereof is parallel to the ridge line 21 of the claw body 22, the rotational resistance is reduced similarly to the claw body 22 having the ridge line 21. In this respect as well, damage such as breakage and bending can be suppressed. Moreover, since the protrusion part 35 which protrudes from the width direction of the engagement convex part 31 is formed in the width direction both ends of the adhering board 32, it can excavate also by the protrusion part 35 of this adhering board 32. The drilling performance can be further improved.

Further, as shown in FIG. 3, the excavation stirring blades 20 are arranged in a plurality of rows at predetermined intervals along a predetermined spiral (reference numeral 14 in FIG. 3) on the outer peripheral surface 12 of the rotary head 11. When viewed from the direction perpendicular to the rotation axis, a plurality of excavation stirring blades 20 are provided at a predetermined interval D along the rotation axis P. Therefore, the excavation width along the rotation axis P of the rotary head 11 is increased, and accordingly, Drilling efficiency is improved.
Furthermore, since the excavating and stirring blades 20 are arranged in a plurality of rows at predetermined intervals along the predetermined circumference (circle Qa) on the outer end surface 13 of the rotary head 11, the side of the rotary head 11 can also be excavated. The excavation range is increased and the excavation efficiency is improved accordingly.

  When the worn claw body 22 is replaced, as shown in FIGS. 4 and 5, the lock key 40 is removed, and the worn claw body 22 has a convex body of the engaging convex portion 31 in the engaging concave portion 25. 33, the new claw body 22 is engaged with the convex body 33 of the engaging convex portion 31 at the engaging concave portion 25, and the lock key 40 is inserted through the through holes 36 and 37 again. In this case, since the nail | claw body 22 can be replaced | exchanged by simple operation | work, workability | operativity will become good. Since it is made detachable, when the nail body 22 is worn, it can be replaced with a new nail body 22, so that it is not necessary to replace the entire head, thereby saving labor and improving efficiency. Since the nail | claw body 22 is a simple shape and is made of a casting, it can be produced comparatively cheaply and it can aim at labor saving.

Next, an example is shown. In the embodiment, as shown in FIGS. 2 and 3, the excavation stirring blade 20 is provided, the rotation axis P direction width a is 1700 mm, the diameter direction width b around the rotation axis P is 1150 mm, and the length of the excavation stirring blade 20 C is 275 mm, the maximum width d of the excavating and stirring blade 20 is 100 mm, the output shaft torque is 13730 N / m, the rotational tangential force (cutting force) is 40200 N, and the rotational speed of the rotary head 11 is 81 rpm (oil amount 220 L / min) as standard. ).
In this example, as shown in FIG. 1, a standard working depth was set to 0 to 4.5 m, and an excavation stirring test was performed. The case where excavation and stirring is performed using a backhoe that has been conventionally used is referred to as Comparative Example 1, and a conventional apparatus having an excavation and stirring blade manufactured by another company is compared as Comparative Example 2.

As a result, in Comparative Example 1, the construction amount per day was 180 m ³ / day, and in Comparative Example 2, 300 to 400 m ³ / day. On the other hand, the working amount per day was 600 to 800 m ³ / day, and it was found that the processing capacity was greatly improved. Further, in the quality of excavation stirring, in Comparative Example 1, the quality is likely to vary, and in Comparative Example 2, this was eliminated, but in Example, the uniformity of excavation stirring was improved as compared with Comparative Example 2.

In Comparative Example 1, the construction unit price per 1 m ² was 626 (yen / m ² ), and in Comparative Example 2, the construction unit cost per 1 m ² was 467 (yen / m ² ). In contrast, embodiments, construction cost per 1 m ² was found to be able to cheaper construction bids up to 200-300 (yen / m ^2).

  According to the present invention, when improving the ground such as soft ground, the processing capacity is high and the quality is improved, so that the construction period can be shortened and the economical efficiency is improved, which is extremely useful.

S Ground excavation and stirring device 1 Work vehicle 6 Arm 10 Base body 11 Rotating head P Rotating shaft 12 Outer peripheral surface 13 Outer end surface 14 Spiral Qa, Qb Circle 21 Ridge line 22 Claw body 23 Standing wall surface 24 Inclining wall surface 25 Engaging recess 30 Support member 31 Engaging convex portion 32 Fixing plate 33 Convex portion main body 34 Leg piece 35 Protruding portion 36, 37 Through hole 40 Lock key 42 Rubber member 44 Holding hole

Claims (3)

A metal base body attached to the work vehicle, a pair of metal rotary heads protruding from the left and right sides of the base body and rotatably supported by the base body, and projecting from the rotary heads In the ground excavation and stirring device provided with a plurality of metal drilling and stirring blades,
The excavation stirring blade is configured to include a mountain-shaped claw body having a linear ridge line at the tip, and the ridge line of the claw body extends along a tangential direction of a circle around the rotation axis of the rotary head. drilling stirring blade set on the rotary head,
The excavation stirring blade is configured to include a support member that is fixed to the rotary head and supports the claw body, and the claw body is detachably provided on the support member.
A pair of substantially triangular standing wall surfaces facing the circumferential direction of a circle around the rotation axis of the rotary head, and a pair of inclined wall surfaces that are connected to the standing wall surface and form the ridge line. The engaging claw is formed on the base end side of the nail body, the engaging protrusion is formed on the support member to be engaged with the engaging recess of the nail body, and the nail body is formed. The engaging concave portion is engaged with the engaging convex portion of the supporting member so that the engaging concave portion can be attached to the supporting member, and a wall portion constituting the engaging concave portion of the claw body and a through hole penetrating the engaging convex portion are provided. Provided with a lock key that is inserted through the through hole and locks the engagement of the engagement recess with the engagement protrusion,
The support member includes a fixing plate having a width greater than the width of the engaging projection, and the bottom of the fixing plate is arranged such that the width direction of the fixing plate is parallel to the ridge line of the claw body. An edge is welded and fixed to the rotary head, and the engaging convex portion is configured to include a convex main body and a pair of leg pieces that are connected to the convex main body and sandwich the fixing plate, and the leg pieces are configured as described above. A ground excavation and agitation apparatus, wherein the fixing plate is inserted into an approximately center in the width direction of the fixing plate from the upper edge side, and the fixing plate is clamped, attached to the fixing plate, and fixed by welding . The rotary head is formed in a substantially cylindrical shape having an outer peripheral surface and an outer end surface with the rotation axis as an axis, and a plurality of the excavation stirring blades are provided on the outer peripheral surface at predetermined intervals along a predetermined spiral. The ground excavation and stirring device according to claim 1 . 3. The ground excavation and stirring device according to claim 2 , wherein a plurality of the excavation and stirring blades are arranged at predetermined intervals along a predetermined circumference on the outer end surface of the rotary head.

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