JP3318297B2 - Excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator such as a TBM equipped with a roller cutter.

[0002]

2. Description of the Related Art An example of an excavator such as a TBM is disclosed in Japanese Patent Application Laid-Open No. H11-280384. This TBM is a machine that excavates tunnels in rock, shale, gravels, etc. by taking reaction force from a segment or a tubular pipe with a propulsion jack or the like. A board is provided, and a plurality of roller cutters are installed on the face board. The roller cutter attached to the face plate of the excavator includes a center cutter attached to the center of the face plate, a gauge cutter attached to the outermost periphery of this face plate, and a circumferential cutter between the outermost periphery and the center. There are inner cutters that can be attached.

[0003]

In the excavator provided with the roller cutter as described above, the gauge cutter attached to the outermost periphery of the face plate particularly wears more than the other cutters. When the gauge cutter is worn, it becomes impossible to secure the outer diameter of the excavation, and it becomes impossible to control the direction on the curve, so that it has to be replaced with a new one. However, the gauge cutter is a heavy object, and it needs to be replaced in a narrow place inside the excavator, requiring a great deal of labor.In addition, it has been replaced with a new one even though the wear limit has not been reached. Economic efficiency was poor. Therefore, the present invention has been made in view of the above circumstances, and aims to provide an excavator that can use a roller cutter without replacing it with a new one even if a roller cutter such as a gauge cutter is worn to some extent. I have.

[0004]

To achieve the above object, according to the solution to ## excavator 1 according to a first aspect of the present invention, for example, as shown in FIGS. 1 and 2, 3 and 4, the body portion 2 tip A face plate portion 3 that rotates around a shaft portion is provided on the portion, and a plurality of roller cutters 4 (4a, 4b, 4c) are provided on the face plate portion 3 around a shaft portion 24 intersecting with the shaft portion of the face plate portion 3. In the excavator 1 rotatably provided, the face plate portion 3 includes a plurality of roller cutters 4 (4 a, 4 b, 4 c) at least a gauge cutter 4 a located on the outer peripheral side of the face plate portion 3. eccentric means 27 for eccentric shaft portion 24 is provided, the eccentric hand
A step 27 supports and fixes the shaft 24 of the roller cutter 4.
Bearing portion 20 and the shaft portion 24 of the bearing portion 20 abut against each other.
The contact surfaces 20a and 20b and the shaft portion 24 of the roller cutter 4
A spacer 26 detachably interposed between the
The shaft portion 24 of the cutter 4 to the contact surface 20 of the bearing portion 20.
a, pressing means 23 for fixing by pressing against
And the spacer 26 is abutted against the bearing portion 20.
Between 20a, 20b and the shaft 24 of the roller cutter 4
The contact surfaces 20a, 2a,
0b and the shaft portion 24 of the roller cutter 4
The roller cutter is moved to the
4 is configured to be eccentric.
Features.

[0005] The excavator includes the body, which is a body of the excavator, for example, and a face plate that rotates about an axis is provided at a tip end of the body. A sediment intake port is provided at the center of the face plate part, and the sediment taken in from the sediment intake port is provided in the trunk at the back of the face plate part by a chute provided on the back surface of the face plate at a sediment collecting place. It is accumulated in a certain chamber.

The roller cutter is mounted on the face plate, a center cutter mounted on the center of the roller cutter, a gauge cutter mounted on the outermost periphery of the face plate, and a center cutter mounted on the outer periphery and the center. There is an inner cutter attached to a circumferential portion between them, and the inner cutter is attached so that the shaft of the face plate intersects with each of the cutter shafts, and is used for various geology. Further, the gauge cutter is directed outward around the shaft of the face plate in order to secure the outermost diameter.

The roller cutter comprises, for example, a roller cutter body and a shaft as shown in FIGS. The roller cutter body has a disk shape, the entire roller cutter body forms a blade, and the shaft portion is provided at the center portion of the roller cutter body, and the thrust of the excavator and the In the process of digging and excavating by rotating using the rotational force of the face plate portion, whether or not the roller cutter has worn is measured by a measurement gauge.

In the excavator according to the present invention, the shaft of the roller cutter, which is located at least on the outer peripheral side of the face plate, of the plurality of roller cutters is directed to the outside of the face plate. When the roller cutter is worn to some extent by excavation, the roller cutter is eccentrically moved toward the outside of the face plate by the eccentric means, so that the roller cutter is eccentric. The cutter can be moved outward in accordance with the wear amount, and excavation can be performed again by the moved roller cutter. Therefore, even if a roller cutter such as a gauge cutter is worn to some extent, the outer diameter of the excavation can be secured, and the roller cutter can be used again without replacing it with a new one.

[0009]

The spacer is a plate-shaped member interposed between the contact surface of the bearing portion and the shaft portion of the roller cutter. The thickness may be set to a value that allows the shaft to be eccentric so that the roller cutter can be in contact with the excavation surface when it is no longer possible to secure the roller cutter. If a plurality of spacers having different thicknesses are prepared, the shaft of the roller cutter is eccentrically divided into a plurality of times.

Further, the spacer is brought into contact with the bearing portion.
When shifting from the state interposed between the surface and the shaft of the roller cutter to the state of being taken out from between the contact surface of the bearing and the shaft of the roller cutter, Preferably, a spacer is interposed between the shaft of the roller cutter and the pressing means. With this configuration, the amount of eccentricity of the shaft of the roller cutter is increased.

In order to fix the shaft portion, the pressing means is provided, and one end of the pressing means is installed in a bearing portion, and a short side of the pressing means having a trapezoidal cross section is fixed. It is arranged so that the slope of the oblique side is toward the fixed part side toward the part side. Further, a tightening means is formed at the other end of the pressing means. When the tightening means is tightened, the surface of the pressing means which comes into contact with the shaft has a slope, so that the pressing means approaches the shaft. The pressing means is pressed against the shaft part because of the action to be performed.

[0013] In the excavator according to the first aspect , furthermore,
The eccentric means may contact the bearing with the bearing;
A spacer detachably interposed between a surface of the roller cutter and a shaft of the roller cutter; and pressing means for fixing the shaft of the roller cutter by pressing the shaft against a contact surface of the bearing. Therefore, the shaft portion of the roller cutter can be eccentric by taking out the spacer interposed between the contact surface of the bearing portion and the shaft portion of the roller cutter. That is, the shaft portion of the roller cutter is easily eccentric by the eccentric means having a simple configuration.

An excavator 1 according to claim 2 is , for example, shown in FIGS.
As shown in FIG. 4, in the excavator 1 according to claim 1 , the shaft portion 24 of the roller cutter 4 has a triangular cross section at a portion supported by the bearing portion 20, and the pressing means 2
3 presses the shaft portion 24 against one surface of the shaft portion 24 of the roller cutter 4 so that the shaft portion 24 is brought into contact with the contact surface 20 of the bearing portion 20.
a, 20b , and a pressing member 2
And a tightening means 22 that presses against one surface of the shaft portion 24 of the roller cutter 4 by tightening 1.

The bearing portion has, for example, two surfaces on which a shaft portion having a triangular cross section of the roller cutter is pressed, and both of the two surfaces are perpendicular to the eccentric direction of the shaft portion of the roller cutter. It is only necessary to cross at. As the bearing part,
For example, a plate in which notches are formed so as to form the two surfaces on a rectangular plate may be used.

Further, the pressing member has a press-fitting surface which presses directly to one surface of the shaft portion of the roller cutter or via the spacer, and the size of the press-fitting surface is It is desirable to set larger than one surface of the shaft portion. The fastening means may be configured to move the pressing member so as to press against the shaft by the bolt or the like, and to fix the pressing member in a state of pressing against the shaft. .

According to the second aspect of the present invention, the shaft of the roller cutter has a triangular cross section, and the pressing means includes a pressing member and a tightening means. After pressing the pressing member, the tightening means is tightened to press the pressing member on one surface of the shaft portion, and press the other two surfaces of the shaft portion against the contact surface of the bearing portion. The contact makes it possible to securely fix the shaft of the roller cutter.

An excavator 1 according to claim 3 is, for example, shown in FIG.
As shown in 1, 2, 5, and 6, the shaft portion is turned around the tip of the body portion 2.
The face plate part 3 is provided to rotate in a
Roller cutters 4 (4a, 4b, 4c)
An excavator provided rotatably around a shaft that intersects the shaft
1, the face plate portion 3 includes a plurality of roller cutters.
4 (4a, 4b, 4c), at least the face plate portion 3
The shaft of the roller cutter 4a located on the outer peripheral side is
An eccentric means for eccentricity toward the outside of the part 3 is provided.
And the shaft of the roller cutter 4 (4a, 4b, 4c)
Comprising a bearing portion 42 for supporting the shaft portion 40 of the roller cutter 4, the portion to be supported by the bearing portion 42 is a rectangular cross-section, the eccentric means 46, the shaft portion 40 of the roller cutter 4 And a spacer 44 removably interposed between the inner surface of the shaft hole 47 and the shaft portion 40 of the roller cutter 4. When the shaft 44 is interposed between one inner surface of the shaft hole 47 and the shaft portion 40 of the roller cutter 4, the inner surface of the shaft hole 47 facing the one inner surface and the shaft portion 40 of the roller cutter 4 are It is characterized in that the shaft portion 40 of the roller cutter 4 is decentered by shifting to a state interposed between the roller cutters 4.

If the shaft hole into which the shaft portion is inserted is, for example, a square shaft hole, the shaft cross section of the roller cutter is
What is necessary is just to make it a rectangular section whose long side is almost the same length as one side of the shaft hole, and whose short side is shorter than one side of the shaft hole. With this configuration, the shaft can be moved in the shaft hole in the direction of the end of the shaft. The spacer has a plate shape, for example, and is fitted without a gap between the shaft portion and the inner surface of the shaft hole when the shaft portion is inserted into the shaft hole.

The spacer only needs to have a thickness capable of decentering the shaft so that the roller cutter can be moved to the excavation surface when the roller cutter has worn to some extent. If a plurality of types are prepared, the shaft portion can be eccentrically divided into a plurality of times.

[0021] The bearing portion includes the open / close lid that enables the spacer to be attached or detached or the roller cutter to be replaced. The opening / closing lid is fixed to the bearing portion by screws or the like, and always strives upward to prevent the shaft portion from dropping during opening and closing.

In the machine according to the third aspect, the shaft portion of the roller cutter has a rectangular cross section, and the eccentric means has a rectangular shaft hole formed in the bearing portion. And the spacer removably interposed between the inner surface of the shaft hole and the shaft portion of the roller cutter, so that the spacer is connected to one inner surface of the shaft hole. By taking out the spacer interposed between the shaft portion of the roller cutter and remodeling between the shaft portion and the inner surface of the shaft hole facing the one inner surface, the shaft portion is removed. It can be easily eccentrically fixed. That is, the shaft portion of the roller cutter can be easily eccentrically fixed by the eccentric means having a simple configuration.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an example of an excavator according to the present invention. FIG. 1 is a side sectional view, FIG. 2 is a front view, FIG. 3 is a side view of a roller cutter before wear, FIG. 4 is a side view of the roller cutter after wear and after eccentricity. As shown in FIG. 1, the excavator 1 includes the body 2 in which main devices such as an excavator and power are packed, and the face plate 3 provided at a tip end of the body 2. Have been.

In the body 2, the sediment intake 5 is provided on the back of the face plate 3, and the sediment taken in from the sediment intake 5 is inclined by the chute 6. The chamber 7 is integrated. The earth and sand accumulated in the chamber 7 is transported rearward by a belt conveyor or the like (not shown). Further, in addition to the above, a power unit for rotating the face plate unit 3 and other various devices are provided in the body unit 2, but the type and arrangement of the devices are not limited thereto.

The face plate portion 3 comprises the face plate main body 3a, a bit 8, the roller cutter 4, and the like. The roller cutter 4 includes a center cutter 4c attached to the center of the face plate portion 3, a gauge cutter 4a attached to the outermost periphery of the face plate portion 3, and a circumference between the outermost periphery and the center. There are three types of the inner cutter 4b.

The roller cutter 4 includes a roller cutter body 25 and a shaft 24 as shown in FIGS.

The roller cutter body 25 has a disk shape, and its outer peripheral portion is formed in a substantially triangular cross section. The shaft portion 24 is inserted through the center of the roller cutter body 25, and the roller cutter body 25 rotates around the shaft portion 24. Further, the shaft portion 24 has a triangular cross section at a portion supported by a bearing portion 20 described later.

The face plate 3 is provided with eccentric means 27 for eccentrically moving the shaft portion 24 toward the outside of the face plate 3. The eccentric means 27 includes a bearing portion 20 for supporting the shaft portion 24 of the roller cutter 4, a spacer 26 detachably interposed between the inner surface of the bearing portion 20 and the shaft portion 24, And a pressing means 23 for pressing the inner surface of the bearing portion 20 against the inner surface of the bearing portion 20.

The bearings 20 are arranged at positions sandwiching the roller cutter 4, and the bearings 20 are supported by a support 30 provided on the face plate 3. The bearing portion 20 is formed of a rectangular iron plate, and a cutout portion 31 is formed in the iron plate. This notch 31 is formed in a substantially triangular shape.
The shaft portion 24 has contact surfaces (inner surfaces) 20a and 20b with which the two surfaces 24a and 24b contact.

The spacer 26 is formed in a plate shape, is interposed between the one surface 24a of the shaft portion 24 and the contact surface 20a, and is detachable from the one surface 24a of the shaft portion 24 with screws or the like. It is fixed to.

The pressing means 23 comprises a pressing member 21 and a tightening means 22. The pressing member 2
Reference numeral 1 denotes a wedge-shaped one surface of the shaft portion 24.
4c, by pressing against one surface 24a of the shaft portion 24 via the spacer 26 against the contact surface 20a,
The other surface 24b of the shaft portion 24 is pressed against the contact surface 20b. The pressing member 21 has an inclined surface 21a that is in pressure contact with one surface 24c of the shaft portion 24, and a through hole 21b that extends in the axial direction.

The tightening means 22 includes a bolt 28 having one end fixed to an iron plate forming the bearing portion 20, a washer 22a externally inserted into the bolt 28, and a nut 22b screwed to the bolt 28. It is composed of The bolt 28 is inserted into a through hole 21 b of the pressing member 21, and the nut 22 b
Are in contact via a washer 22a.

In the tightening means 22, the pressing member 21 is moved toward the one end of the bolt 28 and tightened by rotating the nut 22b in the tightening direction. 21a is brought into pressure contact with one surface 24c of the shaft portion 24. When the one surface 24c of the shaft portion 24 is pressed, the shaft portion 2a is pressed.
4 are the contact surfaces 20a, 2b of the bearing 20.
0b, the shaft portion 24 is fixed.

Next, a method of eccentricity of the roller cutter 4 provided on the face plate portion 3 provided on the front surface of the excavator 1 having the above-described configuration will be described. During the excavation, if the wear exceeds the allowable range as a result of measurement by the measurement gauge, the excavation is restarted by eccentricizing the roller cutter 4 and causing the cutter to penetrate the excavation surface by a predetermined amount.

FIG. 3 shows an excavable state before wear occurs. In this state, the shaft 24 of the roller cutter 4 is fixed to the bearing 20 by the fastening means 22. That is, the pressing member 21 is tightened by the nut 22b, and the inclined surface 21a of the pressing member 21 is
Is pressed against one surface 24c of the shaft portion 24 so that the two surfaces 24a and 24b of the shaft portion 24 are brought into contact with the contact surface 20 of the bearing portion 20.
The shaft portion 24 is fixed by being pressed against a, 20b.

When the roller cutter 4 is worn out, the nut 22b is loosened and removed from the bolt 28, and then the pressing member 21 is removed from the bolt 28 so that the shaft portion 24 is connected to the bearing portion 20. Release from Next, as shown in FIG.
The spacer 26 is removed from a, and the spacer 26 is attached and fixed to the other surface 24c of the shaft portion 24. Then, the shaft 2
4 is inserted into the bearing portion 20, the pressing member 21 and the washer 22a are extrapolated to the bolt 28, and the nut 22b is screwed. Next, the pressing member 21 is closed by rotating the nut 22b in the tightening direction.
Then, the inclined surface 21 a of the pressing member 21 is pressed against the one surface 24 c of the shaft portion 24 and the one surface 24 c of the shaft portion 24 is pressed, so that the two surfaces 24 a and 24 b of the shaft portion 24 The shaft portion 24 is fixed by being pressed against the contact surfaces 20a and 20b. Here, the shaft portion 24 is eccentric toward the outside of the face plate portion 3 by an amount corresponding to the removal of the spacer 26 from one surface 24a of the shaft portion 24, whereby the roller cutter 4 moves to the excavation surface side. .

As described above, according to the present embodiment, during the excavation, when the roller cutter 4 is within the wear limit,
Since the shaft portion 24 can be decentered even if worn to some extent, the roller cutter 4 can be used without replacing it with a new one up to the wear limit. In the above example, the shaft portion 24 is fixed to the bearing portion 20 by tightening the pressing member 21 by the tightening means 22. However, the present invention is not limited to this. By pressing with a device, etc., the shaft 2
4 may be fixed to the bearing 20.

<Second Embodiment> FIGS. 5 and 6 show another example of the excavator of the present invention. FIG. 5 is a side view of the roller cutter before wear, and FIG. 6 is a side view of the roller cutter after wear and after eccentricity. The roller cutter 4 which is a part of the excavator shown in this figure is different from the roller cutter 4 shown in the above example in that the shaft portion 24 has a rectangular cross section instead of a triangular cross section. Therefore, in the following, this rectangular cross-section shaft portion and the bearing portion which is changed accordingly will be described in detail, and the same reference numerals will be omitted for other common components, and the description thereof will be omitted or simplified.

As shown in FIGS. 5 and 6, the shape of the shaft portion 40 attached to the face plate portion 3 has a rectangular cross section.

As shown in FIGS. 5 and 6, the roller cutter 4 includes the roller cutter main body 25 and a shaft portion 40. The roller cutter body 25 has a disk shape, and its outer peripheral portion is formed in a substantially triangular cross section.
The shaft portion 40 is inserted through the center of the roller cutter body 25, and the roller cutter body 25 rotates around the shaft portion 40. Further, a portion of the shaft portion 40 supported by a bearing portion 42 described later is formed in a rectangular cross section.

The face plate portion 3 is provided with eccentric means 46 for eccentrically moving the shaft portion 40 toward the outside of the face plate portion 3. The eccentric means 46 is provided on the shaft 4 of the roller cutter 4.
0 is inserted, and a spacer 44 is removably interposed between the inner surface of the shaft hole 47 and the shaft portion 40 of the roller cutter 4.

The bearing portion 42 has a rectangular shape, and has an opening which is large enough to fit without any gap when the shaft portion 40 and the spacer 44 are combined. The opening / closing lid 45 is provided on the upper part of the bearing portion 42 and is fixed to the bearing portion 42 by screws 41. The shaft portion 40 is fixed by the opening / closing lid 45.

The spacer 44 has a plate shape.
It is interposed between the shaft portion 40 and the inner surface of the opening / closing lid 45, and is detachably fixed to the shaft portion 40 with screws 43.

Next, a method of eccentricity of the roller cutter 4 provided on the face plate 3 provided on the front surface of the excavator 1 having the above configuration will be described. During the excavation, if the wear exceeds the allowable range as a result of the measurement by the measurement gauge, the excavation is restarted by eccentrically moving the roller cutter 4 so that the cutter penetrates the excavation surface by a predetermined amount.

FIG. 5 shows a state in which excavation is possible before wear occurs. The spacer 44 is fixed to one surface 40a of the rectangular shaft portion 40 with a screw 43, the shaft portion 40 provided with the spacer 44 is inserted into the bearing portion 42, and the opening / closing lid 45 is screwed with the screw 41. By fixing, the shaft portion 40 is fixed without any gap.

When the roller cutter 4 is worn, the cover 45 is removed by loosening the screw 41 and the shaft 40 is opened. The opened shaft portion 40 is once removed from the bearing portion 42, the screws 43 of the spacer 44 are loosened in the detached state, and the spacer 44 is removed from the shaft portion 40.

Next, the spacer 44 is fixed to the opposite surface 40b of the shaft portion 40a with the screw 43, inserted into the bearing portion 42, and the opening / closing lid 45 is set on the bearing portion 42, By fixing at 41, the shaft 4
0 is eccentric toward the outside of the face plate 3 by the thickness of the spacer 44, whereby the roller cutter moves to the digging surface side, so that the roller cutter 4 is eccentric. FIG. 6 shows an eccentric state and a worn state of the roller cutter 4.
Is indicated by.

According to the present embodiment, even if the roller cutter 4 is worn to some extent within the wear limit during excavation, the shaft center is decentered by the spacer 44 so that the roller cutter 4 is replaced with a new one until the wear limit is reached. The roller cutter 4 can be used without performing.

[0049]

According to the first aspect of the present invention, since the eccentric means for eccentrically moving the shaft of the roller cutter toward the outside of the face plate is provided, the roller cutter can be adjusted in accordance with the amount of wear. And the excavation can be performed again by the moved roller cutter. Therefore,
Even if the roller cutter is worn to some extent, the outer diameter of the excavation can be secured, so that the roller cutter can be used again without replacing it with a new one.

Further, according to the excavator of the first aspect,
The eccentric means includes a bearing, a spacer removably interposed between a contact surface of the bearing and a shaft of the roller cutter, and a shaft of the roller cutter attached to the bearing. A pressing means for fixing by pressing against the contact surface, so that the spacer interposed between the contact surface of the bearing portion and the shaft portion of the roller cutter is taken out. Thereby, the shaft portion of the roller cutter can be easily decentered.

In the excavator according to the second aspect,
As a matter of course, the same effect as 1 can be obtained, but the shaft portion of the roller cutter is supported by the bearing portion, the portion has a triangular cross section, and the pressing means has a pressing member and a tightening means. Therefore, by further tightening the pressing member by the tightening means, the roller cutter shaft can be securely fixed.

In the machine according to the third aspect, the roller
Eccentricity of eccentricity of the shaft of the cutter toward the outside of the face plate
The center means is provided so that the roller cutter
Move the roller cutter to the outside according to the amount
Drilling can be performed again by the drill. Therefore,
Even if the roller cutter wears to some extent, secure the outer diameter of the excavation.
Replace the roller cutter with a new one
Can be used again without. Further, claim 3
In the excavator of the description, the shaft portion of the roller cutter,
A portion supported by the bearing portion has a rectangular cross section, and the eccentric means includes a rectangular shaft hole into which a shaft portion of the roller cutter is inserted, an inner surface of the shaft hole, and a shaft of the roller cutter. The spacer is detachably interposed between the shaft hole and the spacer, so that the spacer is interposed between the inner surface of one of the shaft holes and the shaft portion of the roller cutter. By shifting to a state interposed between the inner surface of the shaft hole facing the one inner surface and the shaft of the roller cutter, the shaft of the roller cutter can be easily eccentric.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an excavator according to the present invention.

FIG. 2 is a front view of the machine according to the present invention.

FIG. 3 is a side view of the roller cutter before wear in which the shaft has a triangular cross section in the present invention.

FIG. 4 is a side view of the worn and eccentric roller cutter in which the shaft has a triangular cross section.

FIG. 5 is a side view of the roller cutter before wear, in which the shaft has a rectangular cross section.

FIG. 6 is a side view of the worn and eccentric roller cutter in which the shaft has a rectangular cross section.

[Explanation of symbols]

 1, excavator 2, trunk 3, face plate 4, roller cutter 20, bearing 21, pressing member 22, tightening means 23, pressing means 24, shaft 26, spacer 27, eccentric means 40, shaft 42 , Bearing part 44, spacer

Continuation of the front page (56) References JP-A-10-252386 (JP, A) JP-A-11-280384 (JP, A) JP-A-6-193388 (JP, A) Jpn. , Y2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E21D 9/08 E21D 9/10

Claims (3)

(57) [Claims] 1. A face plate rotating around a shaft portion is provided at a front end portion of a body portion, and a plurality of roller cutters are rotatable around the shaft portion intersecting the shaft portion of the face plate portion on the face plate portion. In the excavator provided, the face plate portion has an eccentric means for eccentrically moving a shaft portion of the roller cutter, which is located at least on the outer peripheral side of the face plate portion, toward the outside of the face plate portion among a plurality of roller cutters. The eccentric means supports and fixes the shaft of the roller cutter.
Bearing portion, and a contact surface with which the shaft portion of the bearing portion contacts.
Removably interposed between the shaft of the roller cutter
The spacer and the shaft of the roller cutter are brought into contact with the bearing.
Pressing means for fixing by pressing against the contact surface, wherein the spacer is connected to the contact surface of the bearing portion and the roller cup.
The bearing surface of the bearing from the state interposed between the shaft
And between the roller cutter shaft
By shifting, the shaft of the roller cutter is biased.
Excavation characterized by being configured to be mindful
Machine. 2. The machine according to claim 1, wherein the shaft of the roller cutter is supported by the bearing.
The section is a triangular cross section, and the pressing means is provided on one surface of the shaft of the roller cutter.
By pressing, the shaft is pressed against the contact surface of the bearing.
A pressing member, and the shaft of the roller cutter is tightened by tightening the pressing member.
Tightening means for pressing against one surface of the part
An excavator characterized by the following. 3. A face plate which rotates around an axis at a tip end of a body portion.
Part is provided, and a plurality of roller cutters
Provided rotatable around a shaft that intersects the shaft of the panel
In the excavator, the face plate portion includes at least one of a plurality of roller cutters.
The shaft of the roller cutter located on the outer peripheral side of the face plate
Eccentric means for eccentricity toward the outside of the face plate portion is provided.
A bearing portion for supporting a shaft portion of the roller cutter , wherein the shaft portion of the roller cutter is a portion supported by the bearing portion.
The eccentric means is formed in the bearing portion, and the roller has a rectangular section.
A rectangular shaft hole into which the shaft of the cutter is inserted
Removably interposed between the inner surface and the shaft of the roller cutter
And a roller cutter, wherein the spacer is provided with an inner surface of one of the shaft holes and a roller cutter.
From the state interposed between the shaft part and the one of the shaft holes
Interposed between the inner surface facing the inner surface and the shaft of the roller cutter
The roller cutter is moved to the
Characterized in that it is configured to decenter the shaft of
Excavator.