JPH08158396A - Earth-removing equipment - Google Patents

Abstract

PURPOSE: To adjust the width of an earth-removing equipment arbitrarily and simply by moving an expansion-contraction plate in the cross direction along an earth-removing blade conforming fixing-side pinholes and expansion-contraction-side pinholes bored at regular intervals and inserting position setting pins. CONSTITUTION: An earth removing plate 22, in which a bearing section 22b backwards projected almost horizontally is mounted at the upper edge of an earth removing section 22a, and a pair of left and right expansion-contraction plates 31, in which bearing sections 31b backwards projected approximately horizontally are installed at the upper edge of the earth removing section 31a, are set up to an earth-removing equipment. A plurality of fixing-side pinholes 27 are bored at regular intervals while being penetrated into the bearing section 22b and a fixing-side position setting member 26 towards a lower section from the top face of the bearing section 22b, and expansion-contraction side pinholes 34, 35 in the same intervals and the same axis as the fixing-side pinholes 27 are bored to the bearing sections 31b and expansion-contraction side position setting members 33. When the width of the earth removing equipment is expanded or contracted, position setting pins 38 are extracted and the expansion- contraction plates 31 are moved along the earth-removing blade 22, and the fixing-side pinholes 27 and the expansion-contraction side pinholes 34, 35 are conformed and position setting pins 38 are inserted and fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil discharging device applied to a working machine.

[0002]

2. Description of the Related Art FIG. 9 shows an example of a working machine (hydraulic shovel).

Reference numeral 1 denotes a traveling body, and the traveling body 1 has a pair of left and right crawler shoes 3 each of which is orbitally driven by a traveling hydraulic motor 2.

Reference numeral 4 denotes a revolving frame. The revolving frame 4 is rotatably provided in the upper center of the traveling body 1 and is revolvingly driven by a revolving hydraulic motor (not shown). .

A cover 5 for accommodating various devices (not shown) such as a hydraulic pump driven by an engine, an operation stand 6 for operating the working machine, and a driver are protected on the revolving frame 4. And a canopy 7 for operating.

Reference numeral 8 is an attachment (excavator), and the attachment 8 is pivotally supported by a main boom 9 whose base end is supported by the swivel frame 4 and a base end by a tip end of the main boom 9. Intermediate boom 10 and the intermediate boom 1
0 and a link bar that forms a parallelogram link with the intermediate boom 10 by having a tip boom 11 pivotally supported by the tip portion of 0 and one end pivotally supported by the main boom 9 and the other end pivotally supported by the tip boom 11. 12 and the tip boom 1 whose base end is the above
1 has an arm 13 pivotally supported and a bucket 14 pivotally supported at the tip of the arm 13 for excavating earth and sand, and the intermediate boom 10 swings with respect to the main boom 9. Then, the tip boom 11, the arm 13, and the bucket 14 are configured to move in parallel to the left and right.

The main boom 9, the intermediate boom 10, the arm 13, and the bucket 14 are provided with a boom hoisting cylinder 15,
Boom swing cylinder (intermediate boom 10 in FIG. 9)
(Not shown because it overlaps with), arm rotation cylinder 1
6 (only the piston rod is shown in FIG. 9), and is operated by a bucket rotating cylinder 17.

Reference numeral 19 denotes an earth removing device, and the earth removing device 19
Is a pair of left and right rockers whose base end is pivotally supported by a car body (not shown because it overlaps with the crawler frame 18 in FIG. 9) which is the root of the running body 1 and whose tip end portion protrudes forward of the running body 1. Moving arm 20 and swing arm 2
It has a soil discharging plate 21 attached to the front end portion of 0 for extending the width of the traveling body 1 for ground leveling work and the like.

The earth digging plate 21 travels by operating an earth digging plate hoisting cylinder (not shown in FIG. 9 because it overlaps the rocking arm 20 etc.) for hoisting the rocking arm 20 with respect to the car body. It is designed to move up and down with respect to the body 1.

When performing a ground leveling operation using the working machine having the above-described structure, the earth unloading plate up-and-down cylinder is operated to appropriately set the up and down position of the earth unloading plate 21, and the traveling body 1 is operated. The work machine is caused to travel, and the earth and sand removal plate 21 removes or evens out earth and sand.

[0011]

The entire width of the soil discharging plate 21 in the working machine shown in FIG. 9 is equal to the distance between the outer edges of the left and right crawler shoes 3 in the width direction so that the working machine can pass through a narrow space. Therefore, the ground leveling work cannot be performed efficiently.

On the other hand, "Blade device for dozer, grader, etc." disclosed in Japanese Utility Model Laid-Open No. 61-76861, "Both-side structure of soil discharging plate in soil discharging work machine" and Japanese Utility Model Laid-Open No. 4-112942. Although it has already been proposed to change the overall width of the soil discharge plate (blade), the former is a structure in which extended soil discharge plates are bolted to the left and right ends of the soil discharge plate. Therefore, it is not possible to easily change the entire width of the earth removal plate, and the latter has a complicated structure for slidably supporting the extension blades at both ends of the blade body (earth removal plate), which is not easy to manufacture. In addition, since the extension blade is restrained and released from the blade body on the rear side of the blade body, there is a problem that the operation is difficult.

The present invention has been made in view of the above situation, and an object of the present invention is to provide an earth removing device which can easily change its entire width and is easy to manufacture.

[0014]

In order to achieve the above object, in the earth discharging apparatus of the present invention, the earth discharging portion 22a extending in the width direction of the working machine is projected substantially horizontally to the rear B side at the upper edge portion of the earth discharging portion 22a. The earth discharging plate 22 provided with the supporting portion 22b and the supporting portion 31 which is connected to the upper edge portion of the earth discharging portion 31a and projects substantially horizontally toward the rear B side.
and a pair of left and right expansion / contraction plates 31 provided with b
The fixed side position setting members 26 are provided on the lower surfaces of the left and right end portions of the support portion 22b, and the support portion 22b and the fixed side position setting member 26 are penetrated downward from the upper surface of the support portion 22b of the soil discharging plate 22. In addition, a plurality of fixed side pin holes 27 are formed at equal intervals in the width direction of the soil discharging plate 22, and the supporting portion 31b of the expansion / contraction plate 31 is formed.
A plurality of expansion / contraction side pin holes 34 are formed in the width direction of the expansion / contraction plate 31 at equal intervals to the fixed side pin holes 27 so as to penetrate the support portion 31b downward from the upper surface of the expansion / contraction plate 3.
The lower surface of the first support portion 31b is in contact with the upper surface of the support portion 22b of the soil discharging plate 22, and the rear B side surface of the soil discharging portion 31a of the expansion / contraction plate 31 is the front A side of the soil discharging portion 22a of the soil discharging plate 22. Of the fixed-side position setting member 26 so that the expansion / contraction plate 31 can move in the width direction of the earth-discharging plate 22 while being abutted against the surface of the earth-discharging plate 22. The expansion / contraction side position setting member 33 is provided on the support portion 31b of the expansion / contraction plate 31 so as to be positioned coaxially with the expansion / contraction side pin hole 34 formed in the support portion 31b. 33 is provided with a plurality of expansion / contraction side pin holes 35, and each expansion / contraction plate 3
A guide member 36, which is fixed to the expansion / contraction plate 31 and extends parallel to the soil discharging plate 22, is provided on the rear B side of the soil discharging plate 2.
A support member 28 fixed to the soil discharging plate 22 and for guiding the guide member 36 is provided on the rear B side of the reference numeral 2, and the expansion / contraction side pin hole 34 is provided with respect to a predetermined one of the fixed side pin holes 27. , 35 are moved coaxially with respect to the soil discharge plate 22 so that predetermined ones of the fixed pin holes 27 and the expandable / contractible pin holes 34, 35 are coaxially positioned. 38 is inserted from above.

[0015]

In the soil discharging device of the present invention, when the position setting pin 38 inserted into the fixed side pin hole 27 and the expansion / contraction side pin holes 34, 35 is pulled out upward, the restriction of the expansion / contraction plate 31 is released and the expansion / contraction is performed. The plate 31 can move in the width direction with respect to the earth discharging plate 22.

When setting the soil discharging device to the reduced state,
The expansion / contraction plates 31 for the soil discharging plate 22 are made coaxial with the expansion / contraction side pin holes 34, 35 with respect to a predetermined fixed side pin hole 27 with each expansion / contraction plate 31 not protruding in the width direction of the soil discharging plate 22. , And the position setting pins 38 are inserted into the pin holes 27, 34, and 35 from above, so that the expansion / contraction plates 31 are constrained to the soil discharging plate 22.

When setting the soil discharging device to the expanded state,
The expansion / contraction plates 31 for the soil discharge plate 22 are arranged in a state in which the expansion / contraction plates 31 project in the width direction of the soil discharge plate 22, and the expansion / contraction side pin holes 34, 35 are coaxial with the predetermined fixed side pin hole 27. The expansion / contraction plate 31 is positioned by inserting the position setting pin 38 into the pin holes 27, 34, 35 from above.
Is restrained to the soil discharging plate 22.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 8 show an embodiment of the soil discharging device of the present invention.

Reference numeral 22 denotes an earth-discharging plate, which is formed by pressing a steel plate material or the like, and has an earth-discharging portion which inclines toward the front side A from the upper side to the lower side when viewed from the side. 22
a and a support portion 22b which is continuous to the upper edge portion of the soil discharging portion 22a and which projects substantially horizontally toward the rear B side.

Reference numeral 23 is a reinforcing member having a substantially L-shaped cross section, and the reinforcing member 23 is firmly fixed to the surface of the earth discharging plate 22 on the rear B side of the earth discharging portion 22a over the entire width thereof. Has been done.

The reinforcing member 23 may be formed by pressing a steel plate material or the like, or may be a shaped steel material such as an angle material.

Reference numeral 24 denotes a pair of left and right swing arms formed of steel thick plate material or steel square tube material.
4 is the rear side B of the earth discharging portion 22a of the earth discharging plate 22 when viewed from above.
It is arranged so as to project at a right angle to the side, and its tip is firmly fixed to the earth discharging part 22a and the reinforcing member 23.

A pin hole (not shown) for pivotally attaching the swing arm 24 to the carbody of the working machine is provided at the base end portion of the swing arm 24, and the reinforcing member 23 is also provided.
A connecting bracket (not shown) for connecting one end of the earth shaving plate undulating cylinder is fixed to a portion located between the two rocking arms 24.

Reference numeral 25 denotes a pair of left and right reinforcing brackets. The reinforcing brackets 25 are provided for the respective swing arms 24, and the tip upper surface of the swing arms 24 and
The soil discharging plate 22 is fixed to the upper portion of the surface of the soil discharging portion 22a on the rear B side and the lower surface of the support portion 22b.

Reference numeral 26 denotes a pair of left and right fixed side position setting members (position setting blocks) made of steel square bar material, and the fixed side position setting member 26 is the support portion 22b of the earth discharging plate 22.
Is firmly fixed to the lower surface of the support portion 22b from both widthwise end portions (left and right end portions) of the support portion 22b to the reinforcing bracket 25, and is also firmly fixed to the reinforcing bracket 25.

The fixed side position setting member 26 is not limited to the solid material as in the present embodiment, but a hollow material such as a steel square tube material may be used if the strength condition is met. Good.

Reference numeral 27 denotes a plurality of fixed-side pin holes. The fixed-side pin holes 27 extend downward from the upper surface of the support portion 22b in the vicinity of both widthwise end portions (left and right end portions) of the soil discharging plate 22. Equal intervals in the width direction of the soil discharging plate 22 so as to penetrate the supporting portion 22b and the fixed side position setting member 26 (in the present embodiment, 3 for each of the left and right ends of the soil discharging plate 22).
One) has been drilled.

Reference numeral 28 designates a plurality of support members (brackets for rod support), and the support member 28 is provided with a rod insertion hole 29 penetrating substantially horizontally in the width direction of the earth discharging plate 22.

This support member 28 is the above-mentioned reinforcing member 23.
Two rod insertion holes 29 are fixed to each of both end portions (left and right end portions) in the width direction of the rear B side surface so that they are coaxially positioned.

Reference numeral 30 denotes an incisor member made of flat steel or the like,
The cutting tooth member 30 is fixed to the lower end portion of the soil discharging portion 22a of the soil discharging plate 22 over the entire width thereof.

Reference numeral 31 denotes a pair of right and left expansion / contraction plates. The expansion / contraction plate 31 is formed by pressing a steel plate material or the like.
It has an earth-discharging portion 31a that is inclined from the upper side to the lower side when viewed from the side toward the front A side, and a support portion 31b that is connected to the upper edge portion of the earth-discharging portion 31a and projects substantially horizontally toward the rear B side. are doing.

In the expansion / contraction plate 31, the lower surface of the supporting portion 31b is in contact with the upper surface of the supporting portion 22b of the soil discharging plate 22 described above, and the rear B side surface of the soil discharging portion 31a is the soil discharging plate 22. The soil discharging portion 22a and the front surface of the incisor member 30 are arranged at both widthwise end portions (left and right end portions) of the cutting tooth member 30. The plate 22 is movable in its width direction.

Reference numeral 32 denotes a pair of left and right guide plates, and the guide plate 32 is firmly fixed to one end of the expansion / contraction plate 31.

Reference numeral 33 is an expansion / contraction side position setting member having a substantially L-shaped cross-sectional shape, and one flange portion 33a of the expansion / contraction side position setting member 33 is located substantially horizontally below the fixed side position setting member 26. So that the other flange portion 3
3b is fixed to the lower surface of the support portion 31b of the expansion / contraction plate 31 over the entire width thereof.

The expansion / contraction side position setting member 33 may be formed by pressing a steel plate material or the like,
Alternatively, a shaped steel material such as an angle material may be used.

Reference numeral 34 designates a plurality of expansion / contraction side pin holes. The expansion / contraction side pin holes 34 extend downward from the upper surface of the support portion 31b of the expansion / contraction plate 31 so as to penetrate the support portion 31b.
The expansion / contraction plate 31 is provided at equal intervals (three in each expansion / reduction plate 31 in the present embodiment).

The expansion / contraction side pin hole 34 is formed with the same inner diameter and spacing as the fixed side pin hole 27 described above.
When each expansion / contraction plate 31 is in a state where it does not project in the width direction of the earth discharging plate 22 (reduction state: see FIGS. 2 and 3), 3
One expansion / contraction side pin hole 34 is positioned coaxially with the three fixed side pin holes 27, and each expansion / contraction plate 31 projects in the width direction of the earth discharging plate 22 (expansion state: see FIGS. 5 and 6). ), The two of the three expansion / contraction side pin holes 34 closer to the anti-guide plate are positioned coaxially with the two of the three fixed side pin holes 27 closer to the end of the soil discharging plate. It has become.

Reference numeral 35 denotes a plurality of expansion / contraction side pin holes. The expansion / contraction side pin holes 35 are coaxial with the expansion side position setting member 33 on one flange portion 33a with the same inner diameter as the expansion side pin holes 34. It is drilled so as to be located.

Reference numeral 36 denotes a guide member (guide rod) extending substantially horizontally, and the guide member 36 is provided for each expansion / contraction plate 31.

The guide member 36 is slidably inserted in the rod insertion hole 29 of each support member 28, and the base end portion is fitted and fixed in the rod insertion hole 37 formed in the guide plate 32. .

Reference numeral 38 is a position setting pin. The position setting pin 38 has a head portion 38a having an outer diameter that cannot be inserted into the pin holes 27, 34 and 35, and the head portion 3a.
8a has a body portion 38b having a base end portion continuous with the outer diameter and having an outer diameter that can be inserted into the pin holes 27, 34, and 35.

This position setting pin 38 has the above-mentioned pin hole 2
When the body portion 38b is inserted into the pin holes 27, 34, 35 in a state where the pin holes 34, 35 are coaxially located with respect to 7, the tip end portion of the body portion 38b is expanded / contracted side position setting member 33.
Is configured to project downward.

Further, the head 38a of the position setting pin 38 has a tool insertion hole 39 for inserting a tool.
a so as to pass through in the radial direction of a, and
At the tip of b, a retaining pin insertion hole (not shown in FIGS. 1 and 2 and the like, which overlaps the retaining means 40) for inserting the retaining means (ring pin) 40 is provided in the body portion 38.
It is provided so as to penetrate in the radial direction of b.

Reference numeral 41 is a reinforcing member, and the reinforcing member 41
Is fixed to the front A side surface of the expansion / contraction plate 31.

Incidentally, the expansion / contraction side position setting member 33 described above.
The distance between the end edge of one of the flange portions 33a and the surface of the earth discharging plate 22 on the rear B side of the earth discharging portion 22a, and the other flange portion 33b of the expansion / contraction side position setting member 33 and the main earth discharging plate 22. The space between the support portion 22b and the rear edge of the rear side B is controlled so that an appropriate value is maintained. Mutual interference between the soil discharge plate 22 and the expansion / contraction side position setting member 33 and the soil discharge plate 22 are performed. It is important to prevent the expansion / contraction side position setting member 33 from rattling.

The operation of this embodiment will be described below.

When changing the entire width of the earth removing device, after removing the retaining means 40 from the body portion 38b of the position setting pin 38, the fixed side pin hole 27 and the expansion / contraction side pin holes 34, 3 are formed.
The position setting pin 38 inserted in 5 is pulled out upward so that the left and right expansion / contraction plates 31 can be moved with respect to the soil discharge plate 22.

At this time, even if the body portion 38b of the position setting pin 38 is fixed to the fixed side pin hole 27 and the expansion / contraction side pin holes 34 and 35 by rusting or the like due to long-term use, a rod-shaped tool (for example, a bar) is used. And the like) are inserted into the tool insertion holes 39 of the head portion 38a and the position setting pin 38 is rotated, so that the position setting pin 38 can be easily fixed.

When the position setting pin 38 is pulled out, the left and right expansion / contraction plates 31 with respect to the earth removal plate 22 are not projected in the width direction of the earth removal plate 22 (see FIGS. 2 and 3). Alternatively, the expansion / contraction plates 31 are moved to the state in which they are projected in the width direction of the soil discharge plate 22 (see FIGS. 5 and 6).

When the soil discharging device is set to the reduced state as shown in FIGS. 2 and 3, the three expansion side pin holes 34 are set to three.
So that it is positioned coaxially with the two fixed-side pin holes 27,
Each expansion / contraction plate 31 is manually moved with respect to the earth removal plate 22, and the position setting pin 38 is moved upward to the fixed side pin hole 27 and the expansion / contraction side pin holes 34, 35 which are coaxially positioned. The retaining means 40 is attached to the body portion 38b.

When the soil discharging device is set in the expanded state as shown in FIGS. 5 and 6, two of the three expansion / contraction side pin holes 34 close to the anti-guide plate are among the three fixed side pin holes 27. Each of the expansion / contraction plates 31 is manually moved with respect to the earth removal plate 22 so as to be positioned coaxially with the two near the end of the earth removal plate, and the fixed side pin hole 27 and the expansion / contraction positioned coaxially. The position setting pin 38 is moved upward in the side pin holes 34 and 35, and the retaining means 40 is attached to the body portion 38b of the position setting pin 38.

As described above, in this embodiment, the position setting pin 38 is inserted into the pin holes 27, 34, and 35 from above to restrain the expansion / contraction plate 31 with respect to the earth discharging plate 22.
By pulling out the position setting pin 38 inserted into the pin holes 27, 34 and 35 upward, the restraint of the expansion / contraction plate 31 with respect to the soil discharging plate 22 is released, so that the entire width of the soil discharging device can be easily changed. .

Further, the earth discharging plate 22 extending in the width direction of the working machine
And a pair of left and right expansion / contraction plates 31 arranged so as to be movable along the soil discharge plate 22, and a guide member 36 and a support member 28 for moving the expansion / contraction plate 31 along the soil discharge plate 22.
Since the earth discharging device is constituted by the fixed side position setting member 26 for restricting the expansion / contraction plate 31 with respect to the earth discharging plate 22, the expansion / contraction side position setting member 33 and the position setting pin 38, the number of parts is small. , The earth unloading device can be easily manufactured.

Further, if the position setting pin 38 is pulled out, the expansion / contraction plate 31 can be removed by moving the expansion / contraction plate 31 to the outside of the discharge plate 22.
And maintenance work of various members attached to them can be easily performed.

It should be noted that the soil discharging device of the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[0057]

As described above, according to the soil discharging device of the present invention, various excellent working effects as described below can be obtained.

(1) Insert the position setting pin 38 into the pin holes 27, 3
The expansion / contraction plate 31 is constrained with respect to the earth discharging plate 22 by inserting it from above into the pin holes 27, 34, 3
Since the restraint of the expansion / contraction plate 31 with respect to the soil discharging plate 22 is released by pulling out the position setting pin 38 inserted in the upper portion 5, the entire width of the soil discharging device can be easily changed.

(2) The earth discharging plate 22 extending in the width direction of the working machine
And a pair of left and right expansion / contraction plates 31 arranged so as to be movable along the soil discharge plate 22, and a guide member 36 and a support member 28 for moving the expansion / contraction plate 31 along the soil discharge plate 22.
And the fixed side position setting member 26 for constraining the expansion / contraction plate 31 with respect to the earth discharging plate 22, the expansion / contraction side position setting member 33 and the position setting pin 38, the earth discharging device is configured, so the number of parts is small, The earth unloading device can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a partially cut side view showing an embodiment of an earth discharging device of the present invention.

FIG. 2 is a view taken along the line II-II in FIG. 1 (a partially cutaway rear view of the soil discharging device according to the present invention in a reduced state).

FIG. 3 is a view taken along the line III-III of FIG. 2 (a partially cutaway plan view of the soil discharging device according to the present invention in a reduced state).

FIG. 4 is a view taken along the line IV-IV in FIG. 2 (a cutaway side view of the soil discharge device of the present invention in a reduced state).

FIG. 5 is a partially cutaway rear view of the soil discharging device of the present invention in an expanded state.

6 is a VI-VI arrow view of FIG. 5 (partially cutaway plan view of the soil discharging device of the present invention in an expanded state).

FIG. 7 is a side view of an earth discharging plate which constitutes the earth discharging device of the present invention.

FIG. 8 is a side view of the expansion / contraction plate that constitutes the soil discharging device of the present invention.

FIG. 9 is a side view showing an example of a work machine (hydraulic excavator).

[Explanation of symbols]

 22 soil discharging plate 22a, 31a soil discharging portion 22b, 31b support portion 26 fixed side position setting member 27 fixed side pin hole 28 support member 31 expansion / contraction plate 33 expansion / contraction side position setting member 34, 35 expansion / contraction side pin hole 36 guide member 38 position Setting pin

Claims (1)

[Claims] 1. An earth discharging portion (22) extending in the width direction of the working machine.
a) an earth discharging plate (22) provided with a support portion (22b) protruding substantially horizontally toward the rear (B) side at the upper edge of the earth discharging plate (31);
a) A pair of left and right expansion / contraction plates (31) provided with a support portion (31b) which is connected to the upper edge of the a) and projects substantially horizontally toward the rear (B) side.
And a fixed-side position setting member (26) is provided on the lower surface of the left and right end portions of the support portion (22b) of the soil discharge plate (22), and the lower side of the upper surface of the support portion (22b) of the soil discharge plate (22) Toward the support portion (22b) and the fixed side position setting member (2
6) A plurality of fixed-side pin holes (27) are formed at equal intervals in the width direction of the soil discharging plate (22) so as to penetrate through the soil discharging plate (22), and then downward from the upper surface of the support portion (31b) of the expansion / contraction plate (31). The expansion / contraction plate (3
A plurality of expansion / contraction side pin holes (34) are bored in the width direction of 1) at the same intervals as the fixed side pin holes (27), and the lower surface of the support portion (31b) of the expansion / contraction plate (31) is an earth plate. (2
2) is in contact with the upper surface of the support portion (22b) and the expansion / contraction plate (3
The rear (B) side surface of the earth discharging part (31a) of 1) contacts the front (A) side surface of the earth discharging part (22a) of the earth discharging plate (22), and the expansion / contraction plate (31) is discharged. The expansion / contraction plates (31) are superposed on the left and right ends of the soil discharging plate (22) so as to be movable in the width direction of the soil plate (22), and are located below the fixed side position setting member (26). As described above, the expansion / contraction side position setting member (33) is provided in the support portion (31b) of the expansion / contraction plate (31), and the expansion / contraction side pin hole (3) formed in the support portion (31b).
4) The expansion / contraction side position setting member (3
3) A plurality of expansion / contraction side pin holes (35) are bored and fixed to the expansion / contraction plate (31) on the rear (B) side of each expansion / contraction plate (31) and parallel to the soil discharge plate (22). A guide member (36) extending to the rear side of the earth discharging plate (22) and fixed to the earth discharging plate (22) and guiding the guide member (36). ) Is provided, so that a predetermined one of the expansion-contraction-side pin holes (34) (35) is coaxial with a predetermined one of the fixed-side pin holes (27), with respect to the earth-draining plate (22). The expansion / contraction plate (31) is moved to insert the position setting pin (38) into the fixed-side pin hole (27) and the expansion-contraction side pin holes (34) (35) coaxially from above. Earthmoving device.