JP2000002088A - Disc cutter for underground excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc cutter for an underground excavator, in which only excavating blades are mounted and demounted and can be exchanged and the durability of the mounting sections of the excavating blades can be increased. SOLUTION: In the disc cutter for the underground excavator, which has a shaft 8, a bearing casing 5 axially supported to the shaft 8 and excavating blades 1 consisting of divided pieces divided into two in upper and lower sections and in which each divided piece of the excavated blades 1 is connected and installed around the bearing casing 5 in a ring shape, projecting edge sections 1b with inclined planes 1c are formed along left-right each side section on the inner circumferential sides of each divided piece. When annular excavating-edge fittings 2 screwed to the bearing casing 5 are set up to the left and the right of the excavating blades 1 and the above- mentioned each divided piece is installed to the bearing casing 5, the left-right projecting edge sections 1b of the above-mentioned each divided piece are clamped and pinched by wedge force in cooperation with the bearing casing 5 by moving the left- right each excavating-blade fitting 2 to the left-right projecting edge section 1b sides by screw-feed working by rotating the left-right each excavating-blade fitting 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cutter for an underground excavator mounted on a cutter head of an underground excavator and used for excavating a hard ground.

[0002]

2. Description of the Related Art Underground excavators, such as tunnel boring machines, shield excavators, and pipe propulsion machines, which excavate underground to excavate tunnels, etc., when excavating hard ground such as large gravel layers and bedrock layers. Attach a disk cutter to the cutter head. The disk cutter of this underground excavator excavates by rotating the cutter head while pressing it against the ground so that it rotates and crushes the hard ground. Since the disk cutter of the underground excavator excavates by crushing the hard ground in this way, in the excavation process of the ground, wear and breakage of the excavation blade frequently occur. Therefore, the disk cutter must frequently change the excavation blade, and the time required for the exchange has a great influence on the excavation efficiency. For this reason, various techniques for replacing the cutting edge of the disk cutter have been conventionally developed, and among these techniques, a technique generally used so far is a method of removing the entire disk cutter from the cutter head. It is. As examples of the prior art adopting such a method, Japanese Patent Application Laid-Open Nos. Sho 58-189497 and
Japanese Patent Application Laid-Open No. 165093 and Japanese Utility Model Application Laid-Open No. 6-1496.

[0003] According to the conventional technique generally employed, for example, when exchanging a cutting edge of a disk cutter attached to a shield machine, a large weight (about 100 kgf) is required.
It was necessary to remove the disk cutter as it was and carry it out of the machine, which was a difficult task, and required a lot of time, resulting in poor work efficiency. The present invention seeks to improve the disk cutter of an underground excavator in response to these problems. In order to facilitate understanding of the problems of the prior art and the technical contents of the present invention, an example of a conventional general underground excavator disk cutter is shown in FIGS. Explain the objectives. FIG.
Is a longitudinal sectional view showing an example in which a disk cutter of a conventional general underground excavator is installed in a tunnel excavator, and FIG. 8 is a longitudinal sectional view showing a disk cutter of a conventional general underground excavator. is there.

As shown in FIG. 7, a mounting head 22 for mounting a disk cutter is provided on a cutter head 20 of a tunnel excavator.
Is fixed, and the disk cutter 21 of the underground excavator is fixed.
Are mounted on the cutter head 20 via such mounting seats 22. Then, the cutter head 20 is rotated while being pressed against the ground, so that the cutter head 20 is rotated and revolved while revolving, so that the face 100 of the hard ground is crushed and excavated. The structure of the disk cutter 21 will be described with reference to FIG. 8. In FIG. 8, reference numeral 1 denotes a ring-shaped excavating blade which forms a cut portion of the ground in the disk cutter 21, and 5 denotes a rotatably supported shaft 8 to be described later. A bearing casing 6 as a rotating member; a ring-shaped seal 6 attached to surround the shaft 8 to prevent earth and sand or groundwater from entering the bearing casing 5; and a disk-shaped seal 7 for holding the sealed seal 6. It is a seal holding lid. The excavating blade 1 is attached in a ring shape around the casing 5 by strongly fitting a hole provided on the inner peripheral side thereof to the outer peripheral portion of the bearing casing 5. The bearing casing 5 serves not only as an outer case for accommodating the bearings but also as a mounting portion for mounting the excavating blade 1 in this way. Disk cutter 2
1, a bearing cutter 5 and a shaft 8 to be described later constitute a body 4 of a disk cutter.
, The excavating blade 1 is exchangeably mounted.

Reference numeral 8 denotes a shaft which rotatably supports the bearing casing 5 and forms a shaft of the disk cutter 21, 9 denotes a roller bearing for receiving a radial force and a moment force acting on the cutting blade 1, and 10 denotes a cutting blade. The ball bearings 11 and 12 receive the axial force (force in the direction of the rotation axis of the excavating blade 1) acting on the roller 1. A greasing port provided on the shaft 8 for greasing, a mounting bolt 13 for mounting the seal holding lid 7 to the shaft 8, and a retaining ring 15 for restricting an axial displacement of the excavating blade 1. . The shaft 8 has both ends protruding from both end surfaces of the bearing casing 5,
Both ends are non-rotatably mounted on the mounting seat 22 for mounting the disk cutter. Therefore, both ends of the shaft 8 are formed in a square cross section (see FIG. 2), and the force applied to the excavating blade 1 is transmitted to the cutter head 20 via the mounting seat 22 at these ends. The intermediate portion of the shaft 8 is formed in a cylindrical shape so that the bearing casing 5 can be rotatably supported via a roller bearing 9 and a ball bearing 10.

The retaining ring 15 is fitted into the ring-shaped groove of the bearing casing 5 so as to surround the bearing casing 5 and contacts the side surface of the excavating blade 1. This retaining ring 15
Is configured so that it can be divided into two parts. When the excavating blade 1 is mounted, the two divided retaining rings 15 are respectively attached to the bearing casing 5 and then welded to be integrated. When the excavating blade 1 attached to the bearing casing 5 is replaced in the excavation process of the ground, first, the excavating blade 1 is removed from the mounting seat 22 together with the body 4 of the disc cutter, and the entire disc cutter 21 is removed from the underground excavator. Carry in the cabin. Next, the disc cutter 21 is carried out of the machine, and the two-part retaining ring 15 is blown off at a welding point and removed, and then the disc cutter 21 is mounted on a press machine and the excavating blade 1 is removed from the body 4 by the press machine. Remove with. Thereafter, a new excavating blade 1 is press-fitted into the bearing casing 5 by a press machine and attached in the above-described manner so that it can be reused. When the bearings 9 and 10 are damaged or the disk cutter 21 has reached the end of its life, the disk cutter 21 is scrapped and replaced with a new disk cutter 21. In a conventional general underground excavator disk cutter, when replacing the excavating blade 1, as described above, it is necessary to remove not only the excavating blade 1 but also the entire heavy-weight disk cutter 21 and carry it out of the machine. Therefore, as described above, the replacement work requires a great deal of work, resulting in poor work efficiency.

To cope with such a problem, a disk cutter of an underground excavator which can replace only the cutting blade without removing the body of the disk cutter when replacing the cutting blade of the disk cutter is disclosed in Japanese Utility Model Application Publication No. No. 47995. The disc cutter proposed in this publication includes a shaft (shaft) attached to a mounting seat (retainer), a rotating member (cutter hub) rotatably supported by the shaft, and a ring-shaped member around the rotating member. Equipped with a cutting blade (cutting) attached to the
The digging blade is composed of a plurality of digging blade divided pieces (unit cutting) divided in the circumferential direction, and the digging blade divided pieces are attached in a ring shape around the rotating member ( The terms in parentheses are the terms described in the gazette). In that case, a mounting part is integrally attached to the side of the divided piece of each excavating blade,
Since this mounting part is screwed to the side of the rotating member with a bolt, this bolt is attached and detached, and only the excavating blade is attached and detached while the body of the disk cutter is attached to the mounting seat. can do.

[0008]

However, in the conventional disk cutter of the underground excavator, the mounting portion for mounting the divided piece of the excavating blade to the rotating member is thus provided.
It is designed to be attached integrally to the side of each split piece, and since the split piece of the excavating blade and the mounting part are integrated, when a load is applied to the excavating blade during underground excavation, the mounting Bending stress acts on the part and the mounting part is easily broken. The conventional disk cutter has not been put to practical use until now because of the problem of durability of the mounting portion of the excavation blade.

An object of the present invention is to solve such problems in the prior art, and a technical problem of the present invention is to attach / detach an excavating blade with a disk cutter body attached to a cutter head mounting seat. It is an object of the present invention to provide a disk cutter for an underground excavator that can be exchanged and can increase the durability of an excavating blade mounting portion.

[0010]

According to the present invention, a shaft mounted on a mounting seat fixed to a cutter head of an underground excavator and a shaft rotatably supported by the shaft are provided in order to achieve the technical object. A rotating member, comprising a cutting blade attached to the periphery of the rotating member in a ring shape, the cutting blade is formed of a plurality of divided pieces of the cutting blade divided in the circumferential direction, the divided pieces of these cutting blades In a disk cutter of an underground excavator attached in a ring shape around the rotating member, a protruding edge along an inner peripheral side of each divided piece so that an inner peripheral side of each divided piece is formed wider. Is formed, and is axially movably fitted to the rotating member, and is moved in the axial direction when attaching the plurality of divided pieces to the rotating member, so that the protruding edge of each divided piece is rotated. Working with And it is provided with a circular frame for excavating cutter attachment that can be worn.

Since the present invention employs such means, when each of the divided pieces of the digging blade is attached to the rotating member, the respective divided pieces are arranged in a ring shape around the rotating member, and then are attached to the rotating member. By moving the fitted annular frame for mounting the cutting blade in the axial direction toward the side of the cutting blade,
The projecting edge of each divided piece can be clamped by the cooperation of the annular frame and the rotating member. When exchanging the excavating blade attached to the rotating member in the excavation process of the ground, the axial frame is moved in the axial direction toward the opposite side of the excavating blade to separate the annular frame for attaching the excavating blade from the excavating blade. Remove and replace only the blade split. Therefore, according to the present invention, the digging blade can be attached and detached and replaced while the body of the disk cutter is mounted on the mounting seat of the cutter head,
In addition, a disk cutter for an underground excavator capable of increasing the durability of the mounting portion of the excavation blade can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments showing how a disk cutter of an underground excavator according to the present invention is actually embodied will be described below with reference to FIGS. Embodiments of the invention will be clarified. FIG. 1 is a longitudinal sectional view showing a first embodiment of a disk cutter of an underground excavator of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a disk cutter of the underground excavator of the present invention. 4 is a longitudinal sectional view showing a second embodiment of the present invention, FIG. 4 is a longitudinal sectional view showing a third embodiment of the disk cutter of the underground excavator of the present invention, FIG. 5 is a side view of FIG.
FIG. 6 is a longitudinal sectional view showing a fourth embodiment of the disk cutter of the underground excavator of the present invention. In these figures, the sides of both ends of the shaft of the disk cutter are regarded as side surfaces. In FIGS. 1 to 6, the parts denoted by the same reference numerals as those in FIGS. 7 and 8 represent the same parts as those in FIGS.

The disk cutter of the underground excavator illustrated in FIGS. 1 to 6 has a cutter head 20 of the underground excavator similar to the disk cutter of the conventional general underground excavator shown in FIGS. A shaft 8 attached to a mounting seat 22 fixed to the shaft, a bearing casing 5 as a rotating member rotatably supported by the shaft 8, and the excavating blade 1 attached in a ring shape around the bearing casing 5. It has. Further, this excavating blade 1 is similar to the conventional technique described in Japanese Utility Model Application Laid-Open No. 59-47995.
It consists of a plurality of excavating blades divided in the circumferential direction,
The divided pieces of these excavating blades are attached in a ring shape around the rotating member.

First, a first embodiment of the present invention will be described with reference to FIGS.
The characteristic structure of the embodiment of the present invention is described below.
As shown in FIG. 2, is manufactured in advance by dividing it into upper and lower parts on a dividing surface. In this example, the excavating blade 1 is divided into two, but it may be divided into three or more divided surfaces and divided into multiple parts. Each divided piece of the digging blade 1 is formed so that the opposite side to the blade 1a, that is, the inner peripheral side protrudes left and right, and is formed wide.
An arc-shaped projecting edge 1b is formed on the left and right along the inner peripheral side, and an inclined surface 1c is formed on the left and right projecting edges 1b so that the cross section forms a wedge shape. are doing. A screw hole 1d is formed in each of the divided pieces of the excavating blade 1, and an extraction bolt 1e is screwed into the screw hole 1d to perform a function described later in detail. 2 is a digging blade attachment that is fitted to the bearing casing 5 so as to be movable in the axial direction (the direction of the axis of rotation of the digging blade 1) and that functions to attach each divided piece of the digging blade 1 to the bearing casing 5. The digging blade attachment 2 is pressed against the side end surface of the digging blade attachment 2 to prevent the digging blade attachment 2 from being loosened.

The excavating blade attachment 2 has a base 2a having a hole to be fitted into the bearing casing 5, and an inclined surface 2c that matches the inclined surface 1c of the projected edge 1b of each divided piece. And a clamping portion 2b for clamping, and is formed in a ring shape so as to form an annular frame. In this example,
In order to fit the digging blade attachment 2 movably in the axial direction with respect to the bearing casing 5, a screw is formed on the outer peripheral surface of the bearing casing 5, and the base 2a of the digging blade attachment 2 is attached to this screw. It is screwed and fitted to the bearing casing 5. Also,
In this example, a pair of left and right excavating blade fixtures 2 having such a structure are arranged corresponding to the left and right protruding edges 1b. The locking 3 of the cutting blade attachment 2 is formed of an octagon nut and is screwed into a screw of the bearing casing 5, and when tightened, presses against the side end surface of the cutting blade attachment 2 to loosen the cutting blade attachment 2. Can be prevented. The locking stoppers 3 are also arranged in a pair on the left and right corresponding to the left and right protruding edges 1b.

Since the disk cutter of the underground excavator shown in FIGS. 1 and 2 has the above-described structure, when the two divided pieces of the excavating blade 1 are attached to the bearing casing 5, both of the divided pieces are separated. After being arranged in a ring shape around the bearing casing 5, the digging blade attachment 2 is screwed into the bearing casing 5 and rotated in a predetermined direction. Can be moved in the axial direction by the screw feed action. As a result, the sandwiching portion 2b of the excavating blade attachment 2 is fixed so as to sandwich the projecting edge portion 1b of each divided piece in cooperation with the bearing casing 5. In this case, since the inclined surface 1c and the inclined surface 2c are formed in the protruding edge portion 1b of each divided piece and the sandwiching portion 2b of the excavation blade attachment 2, the excavation blade attachment 2 is moved in the axial direction. At this time, each protruding edge 1b is tightened by the holding portion 2b and the bearing casing 5 by wedge force while the inclined surface 2c is brought into close contact with the inclined surface 1c of the protruding edge 1b of each divided piece. As a result, each divided piece of the excavating blade 1 can be very firmly attached to the bearing casing 5. After attaching the excavating blade 1 to the bearing casing 5 in this way, the left and right anti-loosening screws 3 screwed to the bearing casing 5 are respectively rotated in predetermined directions and pressed against the side end surfaces of the excavating blade fixture 2, thereby excavating. Blade attachment 2
Is prevented from loosening due to vibration during excavation.

When the excavating blade 1 attached to the bearing casing 5 in this way is replaced during the excavation of the ground, the left and right anti-loosening members 3 and the excavating blade attachment 2 are rotated in the opposite direction to that described above. In the axial direction to the opposite side. In the process of moving the digging blade attachment 2, if the inclined surface 2 c of the digging blade attachment 2 bites into the inclined surface 1 c of the digging blade 1 and does not separate, the extraction bolt 1 e screwed into the screw hole 1 d. The head (not shown) is rotated with a spanner so as to protrude from the screw hole 1d, so that the extraction bolt 1e is pressed by the extraction bolt 1e and the excavation blade attachment 2 and the excavation blade 1 are separated. Let it separate. Thus, the excavating blade fixture 2
Is released, only the divided pieces of the excavating blade 1 are removed and replaced while the body 4 of the disc cutter is mounted on the mounting seat 22. Drilling blade 1
Is usually about 10 kg in weight, and in this example, 2 kg
Since the division is made and the weight of the division piece is about 5 kg, when excavating blade 1 is exchanged, it can be easily exchanged by one worker.

The load applied to the disc cutter is
, The radial force of the cutting blade 1, and the force perpendicular to the rotation axis of the cutting blade 1 that acts when the disc cutter is pressed against the face 100. However, in the disk cutter of this underground excavator, the excavating blade attachment 2 is provided so as to clamp the protruding edge portion 1b of each of the divided pieces of the excavating blade 1, so that their forces are reduced. Secondly, since it acts not as bending stress but as tensile stress as in the prior art, the digging blade fixture 2 can withstand those forces, and the durability of the mounting portion of the digging blade is lower than the conventional technology. Greater than. Therefore, the disk cutter of this underground excavator can not only replace the drill cutter 1 by attaching and detaching the drill cutter 1 with the disc cutter body 4 attached to the mounting seat 22 of the cutter head 20 but also mount the drill cutter. The durability of the part can be increased.
When the excavating blade attachment 2 is moved in the axial direction, the excavating blade attachment 2 is moved by the screw feed action, so that a large force is not required for the moving operation.

Next, the characteristic structure of the second embodiment of the present invention will be described with reference to FIG. In the above-described example, the right and left digging blade attachments 2 are arranged in a pair, but in the example shown in FIG. 3, one of the digging blade attachments 2 is integrally or separately protruded from the bearing casing 5. It is designed to replace the excavating blade mounting projection 5A. Therefore, the lock 3 is not provided on the side where the excavation blade mounting projection 5A is provided, but the other structure is basically the same as the structure shown in FIGS. The digging blade attachment protrusion 5A has a sloping surface 5b that matches the sloping surface 1c of each of the divided pieces of the digging blade 1 and has a clamping portion 5a that clamps each protruding edge 1b, similarly to the digging blade attachment 2. A ring-shaped projection is provided around the bearing casing 5.

Since the disk cutter of the underground excavator shown in FIG. 3 is provided with such a structure, a state in which the two divided pieces of the excavating blade 1 are locked to the holding portion 5a of the left excavating blade mounting projection 5A. After being arranged in a ring shape around the bearing casing 5 and screwing the right digging blade attachment 2 to the bearing casing 5 and rotating, the digging blade attachment 2 moves to the left, and as a result, The inclined surface 1c of the left protruding edge portion 1b of each divided piece is connected to the inclined surface 5b of the excavating blade mounting protrusion 5A
, The right protruding edge portion 1 b of each divided piece is sandwiched in cooperation with the bearing casing 5. In this case, the digging blade mounting tool 2 and the digging blade mounting projection 5A respectively hold the inclined surface 2c and the inclined surface 5b in close contact with the inclined surface 1c of the protruding edge portion 1b on the right and left sides of each of the divided pieces. The right and left protruding edges 1b are tightened by the wedge force by the holding portion 5a and the bearing casing 5. As a result, similarly to the first embodiment, each divided piece of the excavating blade 1 can be firmly attached to the bearing casing 5. When replacing the drilling blade 1 attached in this way,
The excavating blade attachment 2 and the locking device 3 on one side are rotated in the opposite direction to the above and moved to the right, and then replaced by the same method as described in the first embodiment. . Therefore, the disk cutter of the underground excavator according to the second embodiment has the same effect as the disk cutter according to the first embodiment, and when excavating blade 1 is replaced, one excavating blade is used. Since only the attachment 2 and the locking device 3 need to be rotated,
The operation is simple.

Next, a third embodiment of the present invention will be described with reference to FIGS.
The characteristic structure of the embodiment will be described. In the first embodiment, an example is shown in which the excavating blade attachment 2 is screwed to the bearing casing 5 when the excavating blade attachment 2 is fitted to the bearing casing 5 so as to be movable in the axial direction. In the example shown in FIG. 2, the digging blade attachment 2 is fitted to the bearing casing 5 so as to be slidable in the axial direction, and a mounting bolt 14 of the digging blade attachment 2 is provided. 2 can be moved in the axial direction with respect to the bearing casing 5. Therefore, the hole 2 provided in the base 2 a of the excavating blade attachment 2 is slidably fitted in the bearing casing 5. The mounting bolt 14 of the excavating blade attachment 2 is screwed to the bearing casing 5 after being inserted into a bolt insertion hole provided in the base 2 a of the excavating blade attaching device 2. The excavating blade attachment 2 and the attachment bolts 14 are arranged as a pair on the left and right corresponding to the left and right protruding edges 1b. The locking device 3 provided in the first embodiment is not provided on either of the left and right sides.
There is basically no difference from the structure shown in FIG.

Since the disk cutter of the underground excavator shown in FIGS. 4 and 5 has the above-described structure, the two divided pieces of the excavating blade 1 are connected in a ring shape around the bearing casing 5. After the arrangement, when the head of the mounting bolt 14 screwed to the bearing casing 5 is rotated in a predetermined direction with a spanner, the excavating blade mounting tool 2 fitted to the bearing casing 5 is pushed by the head of the mounting bolt 14. And move in the axial direction toward the excavating blade 1. As a result, the sandwiching portion 2b of the excavating blade attachment 2 fixes the projecting edge portion 1b of each divided piece so as to sandwich it in cooperation with the bearing casing 5, and the same operation and effect as in the first embodiment. Will be demonstrated. Further, when replacing the drilling blade 1 thus mounted, the mounting bolt 14 is rotated in the opposite direction to that described above to move in the axial direction toward the side opposite to the drilling blade 1, and thereafter, the first concrete What is necessary is just to exchange by the same method as described in the chemical example. Therefore, the disc cutter of the underground excavator of the third embodiment has the same effect as the disc cutter of the first embodiment, and
At the time of attachment and detachment, the head of the mounting bolt 14 may be rotated with a spanner or the like, and a large space is not required for the attachment and detachment operation.

Next, the characteristic structure of the fourth embodiment of the present invention will be described with reference to FIG. In the disk cutter of the underground excavator of the fourth embodiment, two excavating blades 1 are attached in a ring shape around a bearing casing 5, in which case the phase of the two excavating blades 1 is set. Double digging blade mounting projection 5B that can clamp adjacent protruding edges 1b
Are provided between the protruding edges 1b so as to protrude in a ring shape around the bearing casing 5. Like the excavating blade mounting projection 5A, the double excavating blade mounting projection 5B has an inclined surface 5b that matches the inclined surface 1c of each divided piece of the excavating blade 1, and has a clamping portion that clamps each protruding edge 1b. 5A, but is different from the excavation blade mounting projection 5A in that such a sandwiching portion 5a is provided on both the left and right sides so that the adjacent left and right protruding edges 1b can be sandwiched. The locking 3 is 2
Of the left and right sides of each of the excavating blades 1 of the series, they are not provided on the side on which the excavating blade mounting projections 5B are provided, but are provided only on the remaining side. Except for the above points, FIGS. There is basically no difference from the structure shown in FIG.

Since the disk cutter of the underground excavator shown in FIG. 6 has such a structure, each of the two excavating blades 1 has the same mounting as the disk cutter of the second embodiment. When the operation is performed, each of the excavating blades 1 is formed by the holding portion 2 b and the holding portion 5 a and the bearing casing 5.
The right and left protruding edges 1b can be clamped by wedge force, respectively.
Can be firmly attached to the bearing casing 5. Each set of two excavating blades 1
When exchanging the digging blades 1 by exchanging them in the same manner as in the first embodiment, only the divided pieces of the digging blades 1 are kept in a state where the body 4 of the disk cutter is mounted on the mounting seat 22. Can be removed and replaced. Therefore, the disk cutter of the underground excavator according to the fourth embodiment has the same effect as the disk cutter according to the first embodiment, and in addition, when the two excavating blades 1 are exchanged, The operation of the excavating blade 1 is simple because only one excavating blade attachment 2 and the locking device 3 need be rotated.

Various examples in the case where the present invention is actually embodied have been described above. The most common feature of these examples is that the inner peripheral side of each divided piece of the excavating blade 1 is formed wide. Edge portion 1b is formed along the inner peripheral side of each of the divided pieces as described above, and is fitted to the bearing casing 5 so as to be movable in the axial direction. By mounting in the axial direction at the time of attachment to the excavating blade attachment 2 of an annular frame capable of clamping the projecting edge portion 1b of each divided piece in cooperation with the bearing casing 5. In this respect, the technical problem of the present invention is achieved.

In each of the examples described above, when the digging blade fixture 2 is moved in the axial direction, the projecting edge 1
In order to be able to tighten b by the wedge force by the excavating blade fixture 2 and the bearing casing 5, the projecting edge 1b of each divided piece and the excavating blade fixture 2 are formed with inclined surfaces 1c and 2c, respectively. However, such an inclined surface may be formed on one of the protruding edge 1b and the digging blade attachment 2, and even in this case, the protruding edge 1b is formed by the digging blade attachment 2 and the bearing casing 5 by wedge force. Can be tightened. When embodying the disk cutter of the underground excavator of the present invention, in addition to the embodiments described above, the first embodiment is used to move the left and right excavating blade attachments 2 in the axial direction. And the means of the third embodiment are used in combination,
In the second embodiment and the fourth embodiment, the means of the third embodiment is used to appropriately move the excavating blade attachment 2 in the axial direction. Can be adopted.

[0027]

As is apparent from the above description, the present invention relates to a shaft mounted on a mounting seat fixed to a cutter head of an underground excavator, and a rotating member rotatably supported by the shaft. And a digging blade attached in a ring shape around the rotating member, wherein the digging blade is composed of a plurality of divided pieces of the digging blade divided in a circumferential direction, and these divided pieces of the digging blade are In the disk cutter of the underground excavator attached in a ring shape around the circumference of the undercut, a protruding edge is formed along the inner peripheral side of each divided piece so that the inner peripheral side of each divided piece is formed wider. In addition, the protrusion is fitted to the rotating member so as to be movable in the axial direction, and is moved in the axial direction when the plurality of divided pieces are attached to the rotating member, so that the protruding edge of each divided piece cooperates with the rotating member. Work and pinch According to the present invention, the drilling blade can be attached and detached and replaced while the body of the disk cutter is attached to the mounting seat of the cutter head, and A disk cutter for an underground excavator capable of increasing the durability of the mounting portion of the excavation blade is obtained.

When the disk cutter of the underground excavator according to the present invention is embodied, in particular, if the means described in claim 2 is adopted, in addition to the above-described basic effects, the drill cutter can be used. The projecting edge of each of the divided pieces can be cooperated with the annular frame for attaching the excavating blade and the rotating member so as to be particularly fastened by the wedge force, and each divided piece of the excavating blade is attached to the rotating member. It can be attached more firmly. When the disk cutter of the underground excavator according to the present invention or the claim 2 is embodied, particularly when the means according to the claim 3 is adopted, the means according to the present invention or the claim 2 is adopted. In addition to providing the same effect as the case of adopting the above, when the annular frame for mounting the excavating blade is moved in the axial direction, it can be moved by the screw feed action, and a large force is not required for the moving operation. In the case of embodying the disk cutter of the underground excavator according to the present invention and the second aspect of the present invention, particularly, if the means according to the fourth aspect is employed, the means according to the third aspect is employed. In addition to providing the same effect as in the case, the head of the bolt screwed to the rotating member may be rotated with a spanner or the like when attaching or detaching the excavating blade, and a large space is not required for the attaching / detaching operation.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a disk cutter of an underground excavator according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the disk cutter of the underground excavator according to the present invention.

FIG. 4 is a vertical sectional view showing a third embodiment of the disk cutter of the underground excavator according to the present invention.

FIG. 5 is a side view of FIG.

FIG. 6 is a longitudinal sectional view showing a fourth embodiment of the disk cutter of the underground excavator of the present invention.

FIG. 7 is a longitudinal sectional view showing an example in which a disk cutter of a conventional general underground excavator is installed in a tunnel excavator.

FIG. 8 is a longitudinal sectional view showing a disk cutter of a conventional general underground excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling blade 1a Blade 1b Projecting edge 1c Inclined surface 1d Screw hole 1e Extraction bolt 2 Drilling blade attachment 2a Base 2b Clamping portion 2c Inclined surface 3 Locking of excavation blade attachment 2 4 Body of disk cutter 5 Bearing casing 5A Excavating blade mounting projection 5B Double excavating blade mounting projection 5a Clamping portion 5b Inclined surface 7 Holding lid 8 Shaft 14 Mounting bolt for excavating blade mounting tool 20 Cutter head 21 Disk cutter 22 Mounting seat for mounting disk cutter

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazunori Ueda 650, Kandamachi, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 2D054 BA06 BB06 BB07

Claims (4)

[Claims] 1. A shaft mounted on a mounting seat fixed to a cutter head of an underground excavator, a rotating member rotatably supported by the shaft, and an excavation mounted in a ring shape around the rotating member. A cutting edge of the underground excavator, wherein the excavating blade comprises a plurality of divided pieces of the excavating blade divided in a circumferential direction, and the divided pieces of the excavating blade are attached in a ring shape around the rotating member. In the disk cutter, a protruding edge is formed along the inner peripheral side of each divided piece so that the inner peripheral side of each divided piece is formed wider, and it is movable in the axial direction with respect to the rotating member. By fitting the plurality of divided pieces to the rotating member and moving the divided pieces in the axial direction, the projecting edge of each divided piece can be clamped in cooperation with the rotating member. Characterized by having an annular frame And underground excavator disc cutter. 2. When the annular frame for mounting the excavating blade is moved in the axial direction, the projecting edge of the divided piece of the excavating blade is tightened by the wedge force by the annular frame for mounting the excavating blade and the rotating member. ,
2. A disk cutter for an underground excavator according to claim 1, wherein an inclined surface is formed on at least one of a protruding edge portion of the divided piece of the excavation blade and an annular frame for attaching the excavation blade. 3. The rotary frame according to claim 1, wherein the annular frame for mounting the excavating blade is screwed to the rotary member so as to be fitted to the rotary member so as to be movable in the axial direction. Underground excavator disc cutter. 4. An annular frame for mounting an excavating blade is axially slidably fitted to a rotating member, and the annular frame for mounting an excavating blade is inserted into the annular frame and screwed to the rotating member. The disk cutter of an underground excavator according to claim 1 or 2, wherein the bolt can be moved in the axial direction with respect to the rotating member.