JP2000274176A - Bottom-expanding bucket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bottom-expanding bucket in which length in the open- close direction of a guide plate is shortened and the bucket can be compacted and a maximum bottom-expanding diameter can be increased. SOLUTION: A plurality of shafts 5 are disposed to the bucket body 10 of the bottom-expanding bucket for an earth drill in the circumferential direction. Bottom-expanding blades 60 are installed so as to be rotated and opened and closed by open-close devices and freely projected and retreated to the inside of the drum section 9 of the bucket body 10 respectively centering around each shaft 5. Guide plates 24 for introducing soil and sand are fixed on the rear- section sides of the bottom-expanding blades 60. One or a plurality of other guide plates 25 are interposed among the guide plates 24 and an internal surface with the drum section 9 relatively movably in the open-close direction to the drum section 9 and the guide plates 24. The rear ends of the guide plates 24, 25 are formed in a tapered shape and insertion resistance by soil and sand in the case of the housing of the bottom-expanding blades 60 is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enlarged bottom bucket for excavating the bottom of a vertical hole drilled by an earth drill.

[0002]

2. Description of the Related Art An earth drill for drilling a vertical hole for the construction of a foundation pile, etc. is formed by drilling a vertical hole to a predetermined depth at a lower end of a kelever with a shaft drilling bucket, and then converting the shaft moating bucket to an expanded bottom bucket. Instead, the bottom of the hole is excavated in a tapered shape. The bottoming bucket has a bottoming wing with a drilling claw that is opened and closed by a hydraulic cylinder (hereinafter referred to as a bottoming cylinder) on a side surface of the bucket, and the bottoming cylinder supplies pressure oil from a base machine via a hydraulic hose. The expanded bottom wing is opened and closed by receiving and expanding. Such an expanded bottom bucket is disclosed in Japanese Patent Publication No. 63-65797,
No. 47398, Japanese Patent Publication No. 3-77359, and the like.

[0003]

In the above-mentioned conventional bottom-expanding bucket, in order to increase the bottom-expansion ratio, that is, the ratio of the maximum bottom-expansion diameter of the bottom-expansion portion to the diameter of the vertical hole, the diameter when the bottom-expansion wing is housed in the bucket body. When trying to increase the maximum expanded diameter without changing the diameter, the guide plate provided at the rear of the expanded bottom wing and guiding the excavated earth and sand into the bucket becomes long, and cannot be stored within the predetermined diameter. There was a point.

[0004] In view of the problems of the prior art, the present invention provides an expanded bottom bucket having a configuration in which the length of the guide plate in the opening and closing direction can be reduced to make the bucket compact and the maximum expanded diameter can be increased. The purpose is to provide. Another object of the present invention is to provide a bottomed bucket having a configuration in which the bucket can be made compact and the bottomed wing can be smoothly accommodated when the bottomed wing is housed, regardless of the presence of compacted earth and sand in the bucket. I do.

[0005]

According to a first aspect of the present invention, there is provided a bottomed bucket in which a plurality of rotating shafts are arranged in a circumferential direction on a bucket body of the bottomed bucket for an earth drill, and the bottomed wings are opened and closed around the respective rotating shafts. So that it can be rotated and opened and closed by the device,
And, it is mounted so as to be able to protrude and retract from the inside of the body of the bucket body, and a guide plate for introducing earth and sand is fixed to the rear side of the widened wing, and another space for introducing earth and sand is provided between the guide plate and the inner surface of the body. One or more guide plates are interposed so as to be relatively movable in the opening and closing directions with respect to the trunk and the guide plates.

As described above, by dividing the guide plates, each of the guide plates can be shortened, and the length of each of the guide plates in the opening / closing direction can be prevented from being increased even if the expansion ratio is increased. Can be.

According to a second aspect of the present invention, a plurality of rotary shafts are arranged in the circumferential direction on the bucket body of the bottom drill for the earth drill, and the widening blades are respectively rotated around the respective rotary shafts by opening and closing devices. A first guide plate for introducing earth and sand is fixed at the rear side of the expanded bottom wing so that the first guide plate and the second guide plate can be opened and closed, and can be protruded and retracted from within the body of the bucket body. A stopper is provided to limit the relative movement limit position in the opening direction and the closing direction, respectively, between the rear portion of the second guide plate and the body portion, between the front edge of the body portion and the second guide plate. A stopper is provided to prevent the occurrence of a gap, and a stopper is provided between the second guide plate and the body to limit a limit position of the second guide plate in the closing direction.

As described above, the guide plate for introducing earth and sand into the bucket is relatively moved in the opening and closing direction between the first guide plate fixed to the rear portion of the widened wing and the body of the bucket body and the first guide plate. By dividing the guide plate freely into the second guide plate, the length of each guide plate can be reduced, and the length in the opening and closing direction of each guide plate can be prevented from increasing even if the bottom expansion ratio is increased. be able to.

A stopper provided between the first guide plate and the second guide plate serves to move the second guide plate in conjunction with the movement of the first guide plate in the opening / closing direction by an opening / closing device such as a bottom expanding cylinder. Fulfill. The stopper between the rear portion of the second guide plate and the trunk portion of the bucket body causes a gap to be generated between the rear edge of the second guide plate and the front edge of the trunk portion even when the expanded bottom wing is widely opened. To prevent

Further, if a stopper for regulating the limit position of the second guide plate in the closing direction is provided, the entry position of the second guide plate into the bucket body is regulated. Interference is prevented.

[0013] In the third aspect of the present invention, the expanded bottom bucket according to the first or the second aspect, further comprises:
Alternatively, a guide portion is provided between the body portion and the guide plate for regulating relative movement in the vertical and inward and outward directions.

As described above, the upper and lower portions of the second guide plate
By regulating the position in the inward and outward directions, the guide plate is opened and closed without rattling.

According to a fourth aspect of the present invention, in the third aspect, the guide portion includes a groove-shaped guide provided above and below one of the guide plates, and the groove-shaped guide portion is formed on the other guide plate. The upper and lower guide portions are slidably fitted to each other, and an end portion of the groove-shaped guide portion is removed to form a sediment discharging portion.

As described above, by forming the earth and sand discharging portion by cutting off the end of the groove-shaped guide portion, accumulation of sediment in the groove-shaped guide portion is prevented, and the guide plate can be slid smoothly. it can.

According to a fifth aspect of the present invention, there is provided the bottomed bucket according to the third or fourth aspect, wherein a protruding guide portion is provided in the opening / closing direction on the guide plate adjacent to the inside and outside or on the surface facing the guide plate of the body. A guide portion is slidably fitted to the protruding guide portion on a guide plate or a body portion facing the guide portion.

As described above, by forming the concave and convex fitting structure between the guide plates or between the guide plate and the body, the occurrence of vertical play can be eliminated and the guide plates can be slid smoothly. .

According to a sixth aspect of the present invention, there is provided an expanded bottom bucket according to any one of the first to fifth aspects, wherein a rear end of the guide plate is formed in a tapered shape.

As described above, by forming the rear end of the guide plate in a tapered shape, when the expanded bottom wing is housed, there is compacted earth and sand in the bucket, and the guide has a plurality of guide plates. Even if the total thickness of the plate becomes large, the guide plate can smoothly penetrate into the earth and sand, so that the expanded bottom wing can be smoothly accommodated.

According to a seventh aspect of the present invention, in the sixth aspect, the rear end of the guide plate is formed so as to protrude in a rotating direction. The rear end is also formed in a tapered shape.

As described above, by making a part of the rear end of the guide plate protrude, the insertion becomes easy, and not only the front end of the protruding portion but also the front end of the non-protruding portion are formed in a tapered shape. Further, the insertion resistance of the guide plate is reduced, and the accommodation of the expanded wing is facilitated.

[0021]

FIG. 1 is a front view showing an embodiment of a bottomed bucket according to the present invention, and FIG. 2 is a sectional view showing an HH section of the bucket with the bottomed blade closed. 1 and 2, reference numeral 1 denotes a central shaft connected to a keriba (not shown) via a stabilizer (not shown) for preventing run-out of the core during excavation. The frame 2 is fixed. Horizontal frames 3 protruding laterally are fixed to these vertical frames 2 in multiple stages. Bearings 4 are provided at both ends of each horizontal frame 3, and a base end of a support arm 7 of the expanded bottom wing 6 is rotatably attached to a rotating shaft 5 fixed to each bearing 4. That is, in this example, two rotating shafts 5 are arranged in the circumferential direction of the bucket. Numeral 8 denotes a bottomed cylinder comprising a hydraulic cylinder provided as an opening / closing device for opening / closing the bottomed wing 6. I- in FIG.
As shown in FIG.
Is mounted between the support arm 7 and the end of the horizontal frame 3 opposite to the side on which the support arm 7 is mounted.

As shown in FIGS. 1 and 2, a body 9 for containing earth and sand is fixed to a lower end of a rotating shaft 5 fixed to bearings 4 at both ends of the horizontal frame 3. The center axis 1, the vertical frame 2, the horizontal frame 3, and the trunk 9 constitute a bucket body 10. 11 is a bottom cover of the bucket. In the present embodiment, as shown in FIG. 1, the bottomed wings 6 are linked to an upper-stage bottomed wing 60 via a linking portion 61 that can be relatively rotated over a certain range, and a plurality of stages of the bottomed wings are used. Consisting of
By rotating the lowermost wing 6, the upper wing 6 is rotated.
0 also indicates an interlocking structure. By adopting such a structure, the rotation range of the upper-stage expanding blade 60 at the time of closing is reduced, so that the upper-stage expanding blade is provided at the upper part of the bucket where there is only a small space. Wing 60 and bucket body 1
This figure shows that interference with the wings 6 and 60 is prevented so that the widened wings 6 and 60 can be accommodated in a small space. In other words, when trying to increase the maximum expanded diameter while maintaining the diameter of the vertical hole, it is necessary to enlarge the expanded bottom wing, and when the expanded bottom wing is increased, the retracted amount of the expanded bottom wing becomes large when storing the expanded bottom wing in the bucket. Therefore, at the upper end of the tapered expanded wing, interference between the expanded wing and the bucket body 10 (center axis 1) may occur. In the present embodiment, a plurality of stages (two stages in the illustrated example) of the bottom wing 6 interlocked with an upper bottom wing 60 via a linking part 61 capable of relatively rotating over a certain range. By solving the problem described above, the above problem is solved. It is needless to say that the present invention can be applied to not only such a multi-stage construction of the bottomed wing but also a one-stage construction of the bottomed wing.

In FIG. 2, reference numeral 20 denotes a main scraper rotatably mounted on the rotary shaft 5, reference numeral 20a denotes an auxiliary scraper rotatably mounted at the tip thereof, and reference numeral 21 connects the expanded bottom wing 6 and the main scraper 20. Link. In FIG. 2, when the expanding wing 6 is opened as shown by the arrow R, the main scraper 20 is also opened by the link 21 in the direction of the arrow r.
The auxiliary scraper 20a rotates in the direction of the arrow s due to the pressure of the earth and sand or the resistance of the ground to introduce earth and sand into the bucket. Conversely, when the bottom wing 6 closes in the anti-R direction, the main scraper 20 and the auxiliary scraper 20a rotate in the anti-r and anti-s directions, respectively, to bucket the soil remaining in the main scraper 20 and the auxiliary scraper 20a. It is housed inside.

As shown in the side views of FIGS. 2 and 4 (A), the first guide plate 24 having an arc-shaped planar shape is provided on the opposite side of the cutter 6a at the tip of the expanded bottom wing 6, that is, on the rear part.
Is fixed by welding or the like. The first guide plate 2
Between the body 4 and the body 9, there is a second plane having an arcuate planar shape.
The guide plate 25 is fixed.

As shown in the side view of FIG. 4A and the enlarged cross-sectional view taken along the line YY of FIG. 4B, groove-shaped guide portions 24h are provided above and below the outer surface of the first guide plate 24. 24i
The guide portions 24h and 24i have guide portions 25h and 25i serving as upper and lower edges of the second guide plate 25, respectively.
Are movably fitted. Groove-shaped guide portions 24h, 24
By providing notches 24m and 24n at the end of i, the earth and sand accumulated in the groove-shaped guides 24h and 24i can be discharged from the notches 24m and 24n, and smooth sliding can be performed. .

Further, the first guide plate 24j provided on the outer surface of the first guide plate 24 is slidably sandwiched between the guide portion 25i and the projecting guide portion 25j at the intermediate portion. The guide plate 24 and the second guide plate 25 are configured to move smoothly.

FIG. 5 shows a cross section taken along line DD of FIG.
As shown in (A) and (B), the first guide plate 24
A stopper 24a for abutting the front end of the second guide plate 25 when the expanded wing 6 is closed and a stopper 24b, 25a for abutting each other when the expanded wing 6 is opened, between the first and second guide plates 25. Are fixedly provided on the first guide plate 24 and the second guide plate 25, respectively.

As shown in FIGS. 5A and 5B,
The second guide plate 25 is provided to regulate a limit position in the opening direction of the second guide plate 25 to prevent a gap from being generated between the rear end edge of the second guide plate 25 and the front end edge of the body portion 9. A stopper 25b which comes into contact with a stopper 9a at the front of the body 9 (the end of the entrance of the widened bottom wing 6)
Is provided. As shown in FIGS. 5 (C) and 5 (D) for the EE section in FIG. 4 (A) and FIGS. 6 (A) and 6 (B) for the FF section in FIG. 4 (A). In order to regulate the limit position of the guide plate 25 in the closing direction, a stopper 25c is provided at a front portion of the second guide plate 25 to abut against a stopper 9b at a rear portion of the body portion 9.

In this configuration, when the bottom-extension cylinder 8 is gradually extended while rotating the bucket, the bottom-extension wing 6 is housed in the bucket body when the bottom-extension wing 6 is gradually opened to perform bottom-extension excavation. When the bottom expanding cylinder 8 is extended from the closed state, the support arm 7 and the bottom expanding wing 6 rotate around the rotary shaft 5 and operate in the opening direction. With the movement of the expanded bottom wing 6 in the opening direction, the first guide plate 24 and the second guide plate 25 provided at the rear of the expanded bottom wing 6 are shown from the inside of the trunk 9 by an arrow a in FIG. Move in the opening direction.

When the expanding cylinder 8 continues to expand and the expanding blade 6 continues to open as shown by the arrow b in FIG. 5B, a stopper 25b at the rear of the second guide plate 25 is provided.
Comes into contact with a stopper 9a provided at a front portion of the body portion 9, and the second
The guide plate 25 stops opening further. This prevents a gap from being generated between the rear edge of the second guide plate 25 and the front edge of the body portion 9 and prevents the earth and sand introduced into the bucket from leaking out of the bucket. When the expanded bottom wing 6 is further opened from this state, the first guide plate 24 includes the guide portions 24h and 24i and the guide portions 24j.
Are opened while sliding on the upper and lower and middle guide portions 25h, 25i, 25j of the second guide plate 25. The relative movement of the first and second guide plates 24 and 25 makes it possible to move both without rattling.

FIGS. 5A and 5B show a case where the first guide plate 24 and the second guide plate 25 are simultaneously opened in an overlapping state.
Depending on the sliding resistance between the guide plate 24 and the second guide plate 25, as shown in FIGS. 5C and 5D, at the beginning of the opening operation, the first guide plate 2
Only four may open as shown by arrow c. In this case, the first guide plate 24 is
h, 24i and 24j, the first guide plate 24 is independently opened while sliding on the guide portions 25h and 25i on the upper and lower edges of the second guide plate 25 and the intermediate guide portion 25j. By such an opening operation, as shown in FIG. 5D, the stopper 24b provided at the rear of the first guide plate 24 is moved to the stopper 2 at the front of the first guide plate 25.
When it comes into contact with 5a, the second guide plate 25 is also pulled by the first guide plate 24 and opens as shown by the arrow d.

On the other hand, also with respect to the closing operation of the expanded bottom wing 6, the first guide plate 24,
6A and 6B, in which the first guide plate 24 is closed at the beginning of the closing operation, and the second guide plate 25 is also closed in conjunction with the first guide plate 24.

FIGS. 6A and 6B show the case where the resistance of the earth and sand in the bucket is small.
That is, at the time of the closing operation, as shown by the arrow e in FIG. 6A, the first guide plate 24 and the second guide plate 25
Closes simultaneously in the spread state. By such a closing operation, as shown in FIG. 6B, the second guide plate 2
When the stopper 25c on the outer surface of the abutment 5 comes into contact with the stopper 9c of the body 9, further movement of the second guide plate 25 stops, and thereafter, only the first guide plate 24 moves in the closing direction.

FIGS. 6C and 6D show the case where the resistance of the earth and sand in the bucket is large. In this case, the movement of the second guide plate 25 in the closing direction is blocked by the earth and sand due to the resistance of the earth and sand. 6 (C), only the first guide plate 24 moves in the closing direction until the stopper 24a of the first guide plate 24 comes into contact with the edge of the front end of the second guide plate 25, as shown by the arrow g in FIG. . The stopper 24a of the first guide plate 24 is
After contact with the front end edge of the second guide plate 2 as shown by the arrow i in FIG.
While pressing 5, the guide plates 24, 25 move in the closing direction in an overlapping state.

As described above, by dividing the guide plate for introducing earth and sand into the bucket into two, the length of the guide plate in the opening and closing direction can be reduced. Therefore, even if the maximum expanded diameter is increased, the guide plate can be stored in the bucket body, and the maximum expanded diameter can be increased.

In the above-described embodiment, the guide portions 24h to 24j are provided between the first guide plate 24 and the second guide plate 25, but the guide portions are provided between the body 9 and the second guide plate 25. May be provided. Further, a plurality of guide plates may be provided between the first guide plate 24 and the body 9.

FIGS. 7 to 9 are views for explaining another embodiment of the present invention, which has means for reducing the insertion resistance of the guide plate when the expanded bottom wing 6 is accommodated. FIG. 7A is a view of the first guide plate 24 viewed from the outside, and FIG. 7B is a plan view showing a rear end of the first guide plate 24 in an enlarged manner. The end has a protruding portion 24p, and the tip is formed in a tapered shape 24r. 7C is a view of the second guide plate 25 viewed from the outside, and FIG. 7D is a plan view showing a rear end portion of the second guide plate 25 in an enlarged manner. Has a protruding portion 25p at the rear end, and the tip of the protruding portion 25p is formed in a tapered shape 25r that is continuous with the tapered portion of the tip surface of the reinforcing portion 25s on the inner surface, and the tip of the stopper 25b provided on the outside is also tapered. It is formed in a shape 25t.

FIGS. 8A and 8B show the states of the guide plates 24 and 25 shown in FIG. 7 corresponding to FIGS. 5A and 5B, and FIG. It is a figure shown in a state at the time. As shown by an arrow i in FIG. 9, when the expanded bottom wing 6 is housed, the insertion resistance of the guide plates 24, 25 is reduced by forming the rear ends of the guide plates 24, 25 into tapered shapes 24 r or 25 r, 25 t. Reduced
Even if there is compacted earth and sand in the bucket and the thickness of the entire guide plate is increased by the two guide plates 24 and 25, the expanded bottom wing 6 can be easily inserted.

Further, projecting portions 24p are provided above and below the first guide plate 24, and a non-projecting portion 24q (recess) is provided between them. The second guide plate 25 also has a projecting portion 25p in the middle portion and the other portions are non-projecting portions. Projection 25q (recess)
The reason is to avoid interference between the link 21 shown in FIG. 2 and the rear ends of the guide plates 24 and 35, and to secure the length of the guide plates 24 and 25. But,
As described above, by partially projecting the guide plates 24 and 25 and forming the projecting portions 24p and 25p, that is, the tips of the leading portions in a tapered shape, the insertion resistance of the guide plates 24 and 25 can be further reduced. it can.

FIG. 10 shows a modification of FIG.
FIGS. 10A and 10C are drawn corresponding to FIGS. 7A and 7C, and FIGS. 10B and 10D are respectively shown in FIG.
It is a JJ enlarged sectional view and a KK enlarged sectional view of (A) and (C). In the example of FIG. 10, the guide plate 24,
25 non-projecting parts 24q, 25q are also tapered 24s, 2
5u, so that the guide plates 24, 25
Are further reduced in insertion resistance. In this way, the non-projecting portions 24q and 25q are also formed in a tapered shape, so that the insertion of the expanded bottom wing 6 is further facilitated.

The structure in which the rear ends of the guide plates 24, 25 are tapered can be applied to a structure in which the rear ends of the guide plates 24, 25 do not have the protrusions 24p, 25p.

[0042]

According to the first aspect, a guide plate for introducing earth and sand is fixed to the rear side of the widened bottom wing, and another one of the guide plates for introducing earth and sand is provided between the guide plate and the inner surface of the body. Since one or a plurality of guide plates are interposed so as to be relatively movable in the opening and closing direction with respect to the body and the first guide plate, each of the guide plates can be shortened, and even if the expansion ratio is increased, the individual The length of the guide plate in the opening and closing direction can be prevented from increasing. Therefore,
There is no restriction on the increase in the bottom expansion ratio for the earth and sand introduction part, and the bottom expansion ratio can be increased without increasing the bucket diameter, and the maximum bottom expansion diameter can be increased. In addition, the taper angle of the inclined surface of the enlarged bottom can be set large.

According to the second aspect, the first guide plate fixed to the enlarged wing, the second guide plate interposed between the bucket body and the first guide plate, and the guide plate And the stopper that regulates the relative movement position between the main body and the body, so that the entry position of the second guide plate into the bucket main body is restricted, so that interference between the bucket main body and the second guide plate is prevented. . In addition, the length of the guide plate in the opening and closing direction can be shortened to make it more compact, the maximum expanded diameter can be increased, the expanded rate can be increased, and the taper angle of the inclined surface of the expanded portion can be set larger. it can.

According to the third aspect, in the first or second aspect, the guide portion for regulating the relative movement in the vertical and inward and outward directions between the guide plates or between the guide plates and the body is provided. By regulating the position of the guide plate in the vertical and inward and outward directions, the guide plate can be opened and closed without play.

According to a fourth aspect, in the third aspect, the guide portion comprises a groove portion provided above and below one of the guide plates, and the groove portion is formed above and below the other guide plate. Is slidably fitted and the end of the groove-shaped portion is removed to form a sediment discharging portion. Therefore, accumulation of sediment in the groove-shaped portion is prevented, and the guide plate slides smoothly. be able to.

According to a fifth aspect, in the third or fourth aspect, a protruding guide portion is provided in the opening and closing direction on the guide plate adjacent to the inside and outside or on the surface of the body portion facing the guide plate. Since the guide portion slidably fitted to the projecting portion is formed on the guide plate or body portion facing the guide portion, the occurrence of vertical play is eliminated, and the guide plate is slid smoothly. be able to.

According to the sixth aspect, in any one of the first to fifth aspects, the rear end of the guide plate is formed in a tapered shape, so that the insertion resistance of the guide plate at the time of housing the expanded bottom wing is reduced. And the expansion wing can be accommodated smoothly.

According to the seventh aspect, in the sixth aspect, the rear end of the guide plate is formed to protrude in the rotating direction, and the front end of the protruding portion is formed in a tapered shape, and the non-protruding portion is formed. Since the rear end is also formed in a tapered shape, insertion resistance of the guide plate is further reduced, and accommodation of the expanded wing is further facilitated.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an expanded bottom bucket according to the present invention.

FIG. 2 is a cross-sectional view showing the HH cross section of FIG. 1 in a closed state of the expanded bottom wing.

FIG. 3 is a sectional view taken along line II of FIG. 1;

4A is a side view showing a main part of the bottomed bucket shown in FIG. 1, and FIG. 4B is an enlarged sectional view taken along line YY of FIG.

FIGS. 5A and 5B are cross-sectional views each showing an example of the opening operation of the present embodiment, taken along the line DD in FIG. 4;
(C), (D) is a cross-sectional view showing another example of the opening operation of the present embodiment in the EE section of FIG.

FIGS. 6A and 6B are cross-sectional views each showing an example of the closing operation of the present embodiment, taken along the line FF in FIG. 4;
(C) and (D) are cross-sectional views each showing another example of the closing operation of the present embodiment, taken along the line FF in FIG. 4.

FIGS. 7A and 7C are views of a first guide plate and a second guide plate according to another embodiment of the present invention as viewed from the outside, and FIGS. 7B and 7D are FIGS. It is a top view which expands and shows the rear end part of the guide plate of (C).

8 is a cross-sectional view showing a state of the guide plate of FIG. 7 at the time of the opening operation of the widened bottom wing corresponding to FIGS. 5A and 5B, respectively.

9 is a cross-sectional view corresponding to the line DD in FIG. 4A, showing a state of the guide plate of FIG. 7 during a closing operation of the widened bottom wing.

FIGS. 10A and 10C are diagrams showing modified examples of the guide plate of FIG. 7 corresponding to FIGS. 7A and 7C, respectively, and FIG. 10B is a view JJ of FIG. FIG. 3D is a cross-sectional view taken along line KK of FIG.

[Explanation of symbols]

1: Central axis, 2: Vertical frame, 3: Horizontal frame, 4: Bearing, 5: Rotary shaft, 6, 60: Expanded wing, 7: Support arm, 8: Expanded cylinder, 9: Body, 9a, 9b: Stopper, 10: bucket body, 11: bottom cover, 20: main scraper, 20a: auxiliary scraper, 21: link, 24: first guide plate, 24a, 24b: stopper, 24h, 24i: groove-shaped guide portion, 24j : Projecting guide part, 24m, 24
n: missing part, 24p: projecting part, 24q: non-projecting part, 24
r, 24s: tapered portion, 25: second guide plate, 25a to 25c: stopper, 25h, 25i: guide portion, 25j: projecting guide portion, 25p: projecting portion, 25
q: Non-projecting part, 25r, 25t, 25u: Tapered part

Claims (7)

[Claims] A plurality of rotating shafts are arranged in a circumferential direction on a bucket main body of a bottoming bucket for an earth drill. And a guide plate for introducing sediment is fixed to the rear side of the expanded bottom wing, and another bucket for introducing sediment is provided between the guide plate and the inner surface of the body. A bottomed bucket, wherein one or a plurality of guide plates are interposed so as to be relatively movable in the opening and closing direction with respect to a trunk portion and a guide plate. 2. A plurality of rotating shafts are arranged in a circumferential direction on a bucket body of a bottoming bucket for an earth drill, and the bottoming wings are turned around by respective rotating shafts by opening and closing devices to be opened and closed. And a first guide plate for introducing sediment is fixed to the rear side of the widened bottom wing, and sediment is introduced between the first guide plate and the inner surface of the body. A second guide plate for use is interposed between the body and the first guide plate so as to be relatively movable in the opening and closing directions, and the relative movement between the first guide plate and the second guide plate in the opening direction and the closing direction. A stopper for limiting a limit position, respectively, for preventing a gap from being generated between a front edge of the trunk and the second guide plate between a rear portion of the second guide plate and the trunk. Is established, Serial between the second guide plate and the body portion, the second
A bottomed bucket provided with a stopper for regulating a limit position of the guide plate in a closing direction. 3. The method according to claim 1, wherein a guide portion for restricting vertical and inward / outward relative movement is provided between the guide plates adjacent inside and outside or between the body portion and the guide plate. Characteristic expanded bottom bucket. 4. The guide according to claim 3, wherein the guide comprises a groove-shaped guide provided above and below one of the guide plates, and the groove-like guide slides on the upper and lower guides of the other guide plate. A bottom-expanding bucket, which is movably fitted to form an earth and sand discharge portion by removing an end of the groove-shaped guide portion. 5. A protruding guide portion is provided in the opening and closing direction on the guide plate adjacent to the inside and the outside or on the surface of the body portion facing the guide plate according to claim 3 or 4, wherein the guide portions face each other. A bottomed bucket wherein a guide portion is slidably fitted to the projecting guide portion on a guide plate or a body portion. 6. The bottomed bucket according to claim 1, wherein a rear end of said guide plate is formed in a tapered shape. 7. The rear end of the guide plate according to claim 6, wherein a rear end of the guide plate is formed to protrude in a rotation direction, and a front end of the protruding portion is formed in a tapered shape, and a rear end of the non-projected portion is also tapered. An expanded bottom bucket characterized by being formed in.