JP6433019B2 - Cutter holder for roller cutter - Google Patents

Description

  The present invention relates to a cutter holder for a roller cutter, and more particularly to a cutter holder capable of exchanging a roller cutter mounted on a cutter head at a front end portion of a tunnel excavator from the rear of the cutter head.

  Conventionally, in a tunnel excavator, a cutter head is provided on the front end side of the fuselage. While the fuselage and the cutter head are driven forward by a plurality of shield jacks, the cutter head is rotationally driven to move the front ground (face). Drill and tunnel. In a tunnel excavator, a cutter head equipped with a plurality of roller cutters on the front surface portion is used to excavate hard ground. This roller cutter crushes and excavates the rocks of the face by rotating the cutter head while pressed against the natural ground.

  By the way, when the roller cutter is worn during tunnel excavation and the excavation capability is lowered, it is necessary to replace the worn roller cutter with a new roller cutter. In particular, in a tunnel excavator that continuously excavates a long-distance tunnel, the frequency of replacing the roller cutter increases.

  Here, when the roller cutter is detachably fixed from the front of the cutter head, when replacing the roller cutter, a cutter replacement gap is formed between the cutter head and the ground (face) in front of the cutter head, It is necessary for the operator to enter the cutter replacement gap and perform the replacement work. However, the load of the roller cutter replacement operation is very large and time consuming, and the operation involves a risk of water discharge. Therefore, a technique for exchanging the roller cutter from the rear of the cutter head has been put into practical use.

  For example, Patent Document 1 discloses a cutter holder using a rotary disk. In this cutter holder, the rotary disk is rotated 180 degrees and the roller cutter is moved backward to be removed. When attaching a roller cutter, work in the reverse order.

  Patent Document 2 discloses a cutter holder that uses a wedge action. When exchanging the roller cutter, it is necessary to move the cutter head in the circumferential direction (spoke width direction) and then move it backward through the open groove to remove it.

JP 58-189497 A JP2013-127182A

  The roller cutter is very heavy (for example, about 100 to 300 kg), and soil and sand bite into the gaps between these rotating parts. Therefore, the cutter holder disclosed in Patent Document 1 is paired with a roller cutter. It takes a lot of labor and time to rotate the rotary disk 180 degrees (for example, about one hour per roller cutter).

  The excavation performance of the tunnel excavator is related to the opening ratio of the cutter head, and it is known that the higher the opening ratio, the better the excavation performance. In the technique of Patent Document 2 (wedge method), the roller cutter Since the spoke width of the cutter head needs to be increased by the amount of movement in the rotating direction, the opening ratio of the cutter head is lowered, and the excavation ability of the tunnel excavator is lowered.

  An object of the present invention is to provide a cutter holder for a roller cutter that can simplify the replacement work for removing the roller cutter backward by an operation (work) from the back of the cutter head and shorten the time for the replacement work. To provide a cutter holder for a roller cutter capable of preventing a decrease in excavation capacity by suppressing a decrease in aperture ratio.

The roller cutter cutter holder according to claim 1 is a roller cutter cutter holder for supporting a roller cutter provided in a cutter head at a front end portion of a tunnel excavator, and a roller provided in a cutter head at a front end portion of a tunnel excavator. A pair of holder members for supporting a pair of engagement shafts fixed to a cutter spoke of the cutter head and supporting an end of a roller shaft of the roller cutter; A pair of open housing recesses formed in front walls facing each other of the pair of holder members, and a pair of open housing recesses and a rear end of the pair of housing recesses, and the pair a pair open groove of the engaging shaft portion is passable, said a rotary member that will be accommodated in each accommodating recess, before The engaging shaft portion of the roller cutter and a first state fixable said roller cutter conversion example friendly outright over a second state maintaining releasable obtained by 90 degrees rotation around the axis together with the engaging shaft portion of the A rotary member that is capable of fixing the engaging shaft portion through a wedge action in cooperation with the rotary member in the first state,
A bolt member capable of driving each wedge member from the rear side of the roller cutter in the fastening direction, and in a state where the rotary member is in the second state, a pair of engagement shaft portions and a pair of open grooves Are arranged on a straight line, and the engaging shaft portion can be taken out rearward through the opening groove .

  A cutter holder for a roller cutter according to a second aspect of the present invention is the seat according to the first aspect of the present invention, wherein the holder is accommodated in each of the accommodating recesses with an open gap continuous to the open groove, and receives the rotary member from behind in a cross-sectional view. It is characterized by comprising first and second receiving seat forming members each having a surface formed thereon, and a pair of bolts for fixing the receiving seat forming members to the holder members.

  A cutter holder for a roller cutter according to a third aspect is the invention according to the second aspect, wherein the front end portion of the seat forming member on the side opposite to the wedge member of the first and second seat forming members is It is characterized in that the cutter spoke is positioned in front of a vertical plane including the axis of the engagement shaft portion in a horizontal posture.

  The cutter holder for a roller cutter according to claim 4 is the invention according to claim 1, wherein the rotary member has a stopper portion for restricting the forward movement of the wedge member when the roller cutter is removed. It is characterized by.

  According to a fifth aspect of the present invention, the cutter holder for a roller cutter according to the first aspect of the invention is characterized in that the rotary member is provided with a flange for restricting movement of the roller cutter in the axial direction.

  A cutter holder for a roller cutter according to a sixth aspect is characterized in that, in the invention according to the first aspect, the rotary member includes a thickened portion to which a detachable tool can be engaged.

According to the present invention (cutter holder roller cutters), the switchable rotary member by rotation in the unlocking state of unlocking the fixed mode to fix the engaging shaft portion of the roller cutter, the wedge action The wedge shaft capable of fixing the engaging shaft portion of the roller cutter using the same cooperates to fix the engaging shaft portion of the roller cutter to the pair of holder members. Without being acted on, it can be received by the holder member via the rotary member in the first state, and the roller cutter can be prevented from coming off backward. As a result, it is possible to provide a roller cutter cutter holder having both functions of a conventional rotary method and a wedge method.

  That is, when replacing the roller cutter, the bolt member is operated from the rear of the cutter head to release the fixing by the wedge member, and the rotary member in the first state is rotated 90 degrees together with the engaging shaft portion of the roller cutter. Then, the roller cutter can be removed by moving the engagement shaft portion of the roller cutter through the open groove and moving the roller cutter backward.

  Then, after passing the engagement shaft portion of the new roller cutter through the open groove from the rear, moving the roller cutter forward, and engaging the engagement shaft portion of the roller cutter with the rotary member in the second state, The rotary member is switched to the first state by rotating 90 degrees together with the engaging shaft portion of the roller cutter, and the wedge member is driven in the fastening direction by the bolt member, and the rotary member and the wedge member cooperate to rotate the roller cutter. A roller cutter can be attached to a holder member by making it a fixed state.

  As a result, it is not necessary to rotate the rotary member by 180 degrees as in the rotary method of Patent Document 1, and it is necessary to remove other members such as a wedge member and a lock member together with the roller cutter as in the wedge method of Patent Document 2. Therefore, the replacement work of the roller cutter is simplified, the time for the replacement work can be remarkably shortened, and the tunnel excavation work period can be shortened. By fixing the engaging shaft of the roller cutter via the wedge action, it is possible to ensure the same restraining force as that of the conventional wedge method. Can improve. Moreover, since it is not necessary to widen the spoke width of the cutter head as in the conventional wedge method, it is possible to prevent a reduction in the excavation capability by suppressing a decrease in the opening ratio of the cutter head.

  According to the second aspect of the present invention, first and second seats each having an arcuate sectional view that is housed in each housing recess with an open gap continuous to the open groove and that receives the rotary member from the rear are formed. Since the seat forming member and a pair of bolts for fixing the seat forming member to each holder member are provided, the seat forming member formed of a material harder than the holder member is used as the holder member with the bolt. By fixing firmly, it becomes difficult for plastic deformation (sagging) by the excavation reaction force, and the durability of the cutter holder is improved.

  According to invention of Claim 3, the front-end | tip part of the receiving seat formation member on the opposite side to the wedge member of the 1st, 2nd receiving seat formation member is an engagement axis | shaft in the state which made the cutter spoke a horizontal attitude | position. Since it is located in front of the vertical plane including the axis of the part, when replacing the roller cutter, the workability of replacing the roller cutter is improved by preventing the rotary member from jumping forward.

  According to the invention of claim 4, since the rotary member is provided with the stopper portion for restricting the forward movement of the wedge member when the roller cutter is removed, the wedge member is replaced when the roller cutter is replaced. Preventing jumping forward improves the workability of roller cutter replacement.

  According to the invention of claim 5, since the rotary member is provided with the flange portion for restricting the movement of the roller cutter in the axial direction, the rotary member is prevented from falling when the roller cutter is replaced. This improves the workability of roller cutter replacement.

  According to the sixth aspect of the present invention, the rotary member includes the thickening portion with which the detachable tool can be engaged. Therefore, when the roller cutter is replaced, the detachable tool is engaged with the thickened portion. Thus, the roller member can be easily attached and detached by rotating the rotary member smoothly.

1 is a longitudinal sectional view of a tunnel excavator according to an embodiment of the present invention. It is a front view of a cutter head. It is a front view from the front of the cutter holder for roller cutters. It is sectional drawing of the cutter holder for roller cutters. It is a rear view from the back of the cutter holder for roller cutters. It is a side view from the circumference direction of the cutter holder for roller cutters. It is a principal part enlarged view of FIG. It is a perspective view of a rotary member. It is explanatory drawing which shows the removal condition of a roller cutter. It is explanatory drawing which shows the removal condition of a roller cutter. It is explanatory drawing which shows the removal condition of a roller cutter. It is explanatory drawing which shows the removal condition of a roller cutter. It is explanatory drawing which shows the removal condition of a roller cutter. It is a side view of the tool for attachment or detachment. It is a top view of the tool for attachment or detachment. It is explanatory drawing which shows the removal condition of the roller cutter which used the tool for attachment or detachment. It is explanatory drawing which shows the removal condition of the roller cutter which used the tool for attachment or detachment. It is explanatory drawing which shows the attachment condition of the roller cutter which uses the tool for attachment or detachment. It is explanatory drawing which shows the attachment condition of the roller cutter which uses the tool for attachment or detachment.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

  In this embodiment, the present invention is applied to a tunnel excavator 1 having a cutter head 2 equipped with a plurality of roller cutters 3. The direction indicated by the arrow A in FIGS. 1, 4, and 6 is the front of the tunnel excavator 1, and the direction indicated by the arrow B in FIGS. 2 to 5 is the rotating direction of the roller cutter 3 (the axis of the cutter head 2). The direction indicated by the arrow C in FIGS. 2, 3, 5 and 6 is the radial direction of the cutter head 2 (radial direction extending outward from the center of the cutter head 2, This will be described as the roller axial direction of the roller cutter 3).

First, the overall structure of the tunnel excavator 1 will be briefly described.
As shown in FIGS. 1 and 2, the tunnel excavator 1 includes a cutter head 2 equipped with a plurality of roller cutters 3, a partition wall 5 that partitions the rear end of the chamber 4, a front cylinder 6 a and a rear cylinder 6 b, A mechanism for rotatably supporting the cutter head 2 and a plurality of cutter drive motors 7, a rotary joint 8, a plurality of shield jacks 9, a plurality of bent jacks 10, a water supply pipe 11 and a drainage pipe 12, and a plurality of grippers 13, a rotating ring member 14 rotatably supported, rotation driving means 15 for rotating the rotating ring member 14, and an erector device 17 which is provided on the rotating ring member 14 and covers the segment 16 on the inner surface of the tunnel. The general structure includes the rear platform 18 and the like.

  In this tunnel excavator 1, a plurality of cutters are driven while a cutter head 2 and body members (front cylinder 6 a and rear cylinder 6 b) are driven forward by a plurality of shield jacks 9 against a segment 16 that has been covered. The cutter head 2 is rotationally driven by the motor 7 to excavate the front ground (face) and excavate the tunnel. The mud containing the excavated rock fragments is discharged from the mud discharge pipe 12, and the erector device 17 is provided on the inner surface of the tunnel. Then, the segment 16 is lined.

Next, the cutter head 2 will be described.
As shown in FIGS. 1 and 2, the cutter head 2 is connected to, for example, a head central portion 20, a plurality of cutter spokes 21 extending from the head central portion 20 in the radial direction, and outer peripheral ends of the cutter spokes 21. The outer peripheral ring 22 and the connection arm 2a which is disposed in the chamber 4 and has a letter-like shape in front view and made of a closed cross-section member.

  Each cutter spoke 21 is composed of a pair of spoke plates 21 a arranged in parallel and facing each other with a gap slightly larger than the outer diameter of the roller cutter 3, and each cutter spoke 21 includes a plurality of roller cutters 3. Equipped at appropriate intervals in the radial direction. Most roller cutters 3 other than the roller cutter 3 on the outer peripheral portion are arranged with their axis X facing the cutter spoke 21 in the direction parallel to the cutter spoke 21 (the radial direction of the cutter head 2).

  The roller cutter cutter holder 23 (hereinafter referred to as cutter holder 23) of the present invention is mounted on the pair of spoke plates 21a.

Next, the roller cutter 3 will be described.
As shown in FIGS. 3 to 6, each roller cutter 3 is detachably attached to a cutter holder 23 fixed to a pair of spoke plates 21 a from the rear. The roller cutter 3 has a roller shaft 3a, a roller cutter body 3b rotatably mounted on the roller shaft 3a, and an engagement shaft portion 3c formed at both ends of the roller shaft 3a.

  The engagement shaft portion 3c is formed in a substantially square trapezoidal shape. As shown in FIG. 4, in a state where the roller cutter 3 is fixed to the cutter holder 23, the engagement shaft portion 3c includes a front surface 3f, a rear surface 3r, and an orthogonal side surface 3n orthogonal to the front surface 3f and the rear surface 3r. The inclined side surface 3d (the end surface on the wedge member 33 side) opposite to the orthogonal side surface 3n is formed. The inclined side surface 3d is inclined so as to be separated from the axis X toward the rear end side.

Next, the cutter holder 23 will be described.
As shown in FIGS. 3 to 6, the cutter holder 23 is for rotatably supporting the roller cutter 3 on the cutter head 2, and includes a pair of holder members 25 and a pair of holder members 25. Each of the receiving recesses 26 and the open grooves 27 formed respectively, the first and second seat forming members 28 and 29 and the pair of bolts 31a and 31b respectively attached to the receiving recesses 26, and the receiving recesses 26 A rotary member 32 and a wedge member 33 housed respectively, and a bolt member 34 corresponding to each wedge member 33 are provided.

Next, the pair of holder members 25 will be described.
The pair of holder members 25 support the pair of engagement shaft portions 3 c of the roller cutter 3. The pair of holder members 25 are parallel to each other in a face-to-face manner so as to be orthogonal to the spoke plate 21a between the pair of spoke plates 21a and at a distance slightly larger than the width in the axial direction X of the roller cutter 3. They are arranged symmetrically.

  Each holder member 25 is formed in a substantially rectangular shape when viewed from the direction of the axis X, and has a thickness of about 1.5 times the length of the engagement shaft portion 3c. Both end portions of each holder member 25 in the circumferential direction are welded and joined to the inner side surfaces of the pair of spoke plates 21a, and are fixed to the block member 21b fixed to the pair of spoke plates 21a by bolt members 21c.

  Of the wall portions on the opposite side of the pair of holder members 25, a portion having a thickness substantially the same as the length of the engagement shaft portion 3 c from the inner surface side is provided with a pair of open receiving recesses 26 on the front side. A pair of open grooves 27 that respectively communicate with the central portion of the rear end of the housing recess 26 and through which a pair of engagement shaft portions 3c (the engagement shaft portion 3c with the inclined surface 3d facing backward) can pass. Are formed respectively. Each housing recess 26 is formed in a substantially rectangular shape when viewed from the axial center X direction. The groove width of each open groove 27 is slightly larger than the width between the front surface 3f and the rear surface 3r of the engaging shaft portion 3c and slightly smaller than the maximum width between the orthogonal side surface 3n and the inclined side surface 3d.

Next, the first and second seat forming members 28 and 29 will be described.
The first and second seat forming members 28 and 29 are for supporting the rotary member 32, and are accommodated in the accommodating recess 26 with an open gap 27 a continuous with the open groove 27 on both sides of the open groove 27. Has been. The first and second seat forming members 28 and 29 are detachably mounted in the housing recess 26, respectively. The first and second seat forming members 28 and 29 are made of, for example, a material made of chromium molybdenum steel.

  On the inner side surface of the first receiving seat forming member 28 (side surface facing the second receiving seat forming member 29), a seat surface 28a having an arcuate sectional view with the axis X as the center is formed. On the inner side surface of the seat forming member 29 (side surface facing the first seat forming member 28), a seat surface 29a having an arcuate sectional view centering on the axis X shorter than the seat surface 28a is formed. . The seat surfaces 28a, 29a of the first and second seat forming members 28, 29 are each configured to have a curved surface capable of receiving the partial cylindrical surface 37 on the outer periphery of the rotary member 32 from the rear. The curvature radii of the seat surfaces 28 a and 29 a of the first and second seat forming members 28 and 29 are set to be the same as the curvature radius of the rotary member 32.

  The first seat forming member 28 has a length of about 1.5 times the length of the second seat forming member 29 in the front-rear direction. The lengths of the seating surfaces 28a and 29a of the first and second seat forming members 28 and 29 are set to about 1/4 and 1/8 circumference, respectively. Of the first and second seat forming members 28 and 29, the tip 28b of the first seat forming member 28 on the opposite side of the wedge member 33 has the cutter spoke 21 in a horizontal position as shown in FIG. In this state, it extends to the front from the vertical plane V including the axis X (a plane parallel to the circumferential surface of the cutter head 2).

  The first and second seat forming members 28 and 29 are fixed to the holder member 25 by a pair of bolts 31 a and 31 b that can be operated from the rear side of the holder member 25.

Next, the rotary member 32 will be described.
The rotary member 32 is formed in a shape in which a part of a semicircle is cut out, and the first state (see FIGS. 4, 9, and 10) in which the roller cutter 3 can be fixed and the roller cutter 3 can be fixed and released. In order to switch over to the second state (see FIGS. 11 and 12), the roller shaft 3a and the engaging shaft portion 3c of the roller cutter 3 are housed in the housing recess 26 so as to be rotatable by 90 degrees.

  The rotary member 32 has the same thickness as the length of the engagement shaft portion 3c. The rotary member 32 includes a front surface 36a, a bearing side surface 36b with which the orthogonal side surface 3n of the engagement shaft portion 3c abuts, a rear surface of the engagement shaft portion 3c extending from the rear end of the bearing side surface 36b in a direction orthogonal to the spoke plate 21a. 3r is in contact with the bearing rear surface 36c, the bearing rear surface 36c is continuous with the rear surface 36d extending to the opposite side of the bearing side surface 36b, and the outer periphery is in close contact with the first and second seat forming members 28 and 29. Side partial cylindrical surface 37.

  The rotary member 32 further includes a stopper portion 32a that restricts the forward movement of the wedge member 33 when the roller cutter 3 is removed, a flange portion 38 that restricts the movement in the axial center X direction, and a detachable tool 51. Is provided with a thickened portion 39 or the like that can be engaged.

  The stopper portion 32a is formed at the front end portion of the rotary member 32 so as to protrude forward from the front surface 36a. When the rotary member 32 is in the first state, the tip of the stopper portion 32a is at the same front-rear position as the front end of the first seat forming member 28.

  As shown in FIG. 7, the flange portion 38 is formed so as to protrude slightly outward from the partial cylindrical surface 37 over the entire length of the end portion of the partial cylindrical surface 37 opposite to the roller cutter body 3 b. Has been. The flange portion 38 is engaged with a gap 38a between the first and second seat forming members 28 and 29 and the holder member 25, and restricts the movement of the rotary member 32 in the axial center X direction. .

  The thickened portion 39 is formed in the rotary member 32 so as to expand to the outside of the rotary member 32 in a state of being accommodated in the accommodating recess 26. The thickened portion 39 is a portion of the end surface on the roller cutter side of the rotary member 32 in the first state that is in contact with the engagement shaft portion 3c from the portion that contacts the seat surface 29a of the second receiving seat forming member 29. It is formed to correspond. The thickened portion 39 includes a first engaging portion 39a to which a detachable tool 51 is engaged when the rotary member 32 is switched from the first state to the second state, and when the rotary member 32 is switched from the second state to the first state. And a second engaging portion 39b with which the detachable tool 51 is engaged.

Next, the wedge member 33 will be described.
The wedge member 33 is for fixing the engaging shaft portion 3c of the roller cutter 3 through the wedge action in cooperation with the rotary member 32 in the first state. That is, the wedge member 33 constrains the rotary member 32 in the first state via the engagement shaft portion 3c so as not to rotate between the first and second seat forming members 28 and 29. And is housed in the housing recess 26. The wedge member 33 can be driven from the rear side of the roller cutter 3 by the bolt member 34 in the fastening direction or the fastening release direction. When the wedge member 33 is driven in the fastening direction, the engagement shaft portion 3c and the housing recess 26 are provided. And the side wall surface 26a.

  The wedge member 33 is formed in a trapezoidal shape as viewed from the axial center X direction. A tapered surface 33a that is inclined in the same direction as the inclined side surface 3d is formed on the side surface of the wedge member 33 that faces the inclined side surface 3d of the engagement shaft portion 3c. A bolt hole 33b extending in the front-rear direction is formed in the wedge member 33, a bolt insertion hole 29b is formed in the second seat forming member 29 so as to correspond to the bolt hole 33b, and a bolt insertion hole is formed in the holder member 25. 25b is formed.

  A spacer 42 is provided between the double nut 41 at the rear end of the bolt member 34 and the rear side wall surface 25a of the holder member 25, and a lock nut 43 is provided in the vicinity of the opening of the bolt hole 33b.

Next, a method for attaching and detaching the roller cutter 3 will be described with reference to FIGS.
As shown in FIG. 9, in a use state where the tunnel can be excavated, the engagement shaft portion 3c of the roller cutter 3 is brought into contact with the bearing side surface 36b and the bearing rear surface 36c of the rotary member 32 in the first state, and the wedge member 33 is driven rearward (fastening direction) by the bolt member 34, the tapered surface 33a of the wedge member 33 and the inclined side surface 3d of the engaging shaft portion 3c are engaged, and the wedge member 33 is inclined of the engaging shaft portion 3c. It is fitted between the side surface 3 d and the side wall surface 26 a of the housing recess 26.

  Thus, since the engagement shaft portion 3c is sandwiched between the wedge member 33, the bearing side surface 36b, and the bearing rear surface 36c, the movement of the engagement shaft portion 3c in the front-rear direction is restricted. For this reason, since the engagement shaft portion 3 c is fixedly held by the rotary member 32 in the first state by the wedge member 33, the excavation reaction force of the roller cutter 3 is supplied to the first and second seats via the rotary member 32. It is received by the forming members 28 and 29.

  Next, when the roller cutter 3 is replaced, as shown in FIG. 10, the bolt member 34 is slightly loosened, the spacer 42 is removed from the bolt member 34, and the bolt member 34 is operated from the rear of the cutter head 2. The wedge member 33 is moved forward until the double nut 41 contacts the rear side wall surface 25a of the holder member 25, and the engagement shaft portion 3c is fixed by the wedge member 33. At this time, the lengths of the bolt member 34 and the spacer 42 are adjusted in advance so that the rear end portion of the wedge member 33 does not protrude outward from the housing recess 26.

  Next, as shown in FIG. 11, the rotary shaft 32 of the first state and the engaging shaft 51 of the roller cutter 3 are used by using the detachable tool 51 or the like until the front surface 36 a contacts the wedge member 33. It is rotated 90 degrees together with the part 3c to switch to the second state. At this time, the bearing rear surface 36c and rear surface 36d of the rotary member 32, the wall portion of the first receiving seat forming member 28 on the side of the open gap 27a, and the wall portion of the open groove 27 are linear.

  Next, as shown in FIG. 12, rail members 45 are attached to the rear of the pair of holder members 25, and the pair of engagement shaft portions 3c of the roller cutter 3 are passed through the open grooves 27, respectively. The roller shaft 3 is moved backward by sliding the shaft portion 3c on the rail member 45, and the roller cutter 3 is carried out.

  The new roller cutter 3 can be mounted in the reverse procedure described above. That is, the engaging shaft portion 3c of the new roller cutter 3 is passed from the rear through the open groove 27, the roller cutter 3 is moved forward, and the engaging shaft portion 3c is engaged with the rotary member 32 in the second state. Then, the rotary member 32 is rotated 90 degrees together with the roller shaft 3b and the engagement shaft portion 3c to switch to the first state, and the wedge member 33 is driven in the fastening direction by the bolt member 34, so that the rotary member 32 and The roller cutter 3 is attached to the pair of holder members 25 so that the wedge member 33 cooperates to place the roller cutter 3 in a fixed state.

  When the rotary member 32 is strongly engaged with the seating surfaces 28a and 29a, as shown in FIG. 13, the bolt 31a fixing the first seat forming member 28 is removed and the large diameter bolt hole is removed. The bolt 46 suitable for 25a is screwed and the first seat forming member 28 is strongly pressed forward by the tip of the bolt 46, so that the rotary member 32 is separated from the seating surface and the roller cutter 3 is replaced. Work can be done.

Next, the attachment / detachment tool 51 and the method of using the same will be described with reference to FIGS.
As shown in FIGS. 14 and 15, the detachable tool 51 includes a pair of spanner parts 54, a connection plate part 55 that connects the pair of spanner parts 54 to each other, and a spanner part from the connection part plate 55. A handle portion 56 that extends to the opposite side of 54 is provided, and is configured to be usable for both attachment and detachment of the roller cutter 3.

  Each spanner portion 54 includes first and second claw portions 54a and 54b that can be engaged with the first and second engagement portions 39a and 39b of the thickened portion 39 of the rotary member 32, the first claw portion 54a, and the first claw portion 54a. Each has a curved portion 54c connected to the two claw portions 54b. The 1st nail | claw part 54a and the 2nd nail | claw part 54b are formed in the front-end | tip part of the spanner part 54 so that it may mutually approach.

  When removing the roller cutter 3, as shown in FIG. 16, first, the first engaging portion 39 a of the thickened portion 39 of the rotary member 32 in the first state is engaged with the first of the spanner portion 54 of the detachable tool 51. A pair of rotary members is formed by hooking the claw portions 54a, bringing the curved portions 54c into contact with the outer periphery of the thickened portion 39 (see the solid line in FIG. 16), and rotating the attaching / detaching tool 51 downward. 32 is rotated 45 degrees together with the roller shaft 3 b and the engagement shaft portion 3 c of the roller cutter 3.

  Next, the detachable tool 51 is placed in a reverse orientation, the second claw portion 54b of the spanner portion 54 is hooked on the first engaging portion 39a of the thickened portion 39, and the curved portion 54c is placed on the outer periphery of the thickened portion 39. Attaching (see the two-dot broken line in FIG. 17) and rotating the detachable tool 51 downward, it is rotated 45 degrees together with the roller shaft 3b and the engagement shaft portion 3c of the roller cutter 3. The rotary member 32 is switched to the second state.

  When the new roller cutter 3 is attached, as shown in FIG. 18, the first engaging portion 39 b of the thickened portion 39 of the rotary member 32 in the second state is attached to the first spanner portion 54 of the detachable tool 51. The pair of rotary members 32 and the roller shaft 3b of the roller cutter 3 are engaged with each other by hooking the claw portion 54a, bringing the curved portion 54c into contact with the thickened portion 39, and turning the detachable tool 51 upward. It is rotated 45 degrees together with the shaft portion 3c.

  Next, the attaching / detaching tool 51 is set in a reverse orientation, and the second claw portion 54b of the spanner portion 54 of the attaching / detaching tool 51 is hooked on the second engaging portion 39b of the thickening portion 39 of the rotary member 32 to bend. The rotary member 32 is switched to the second state by bringing the portion 54c into contact with the outer periphery of the thickening portion 39 and rotating the detachable tool 51 upward.

Next, the effect of the cutter holder 23 of the present invention will be described.
According to the cutter holder 23 according to the present embodiment, the rotary member 32 that can be switched between a fixed state and a fixed release state of the roller cutter 3 by rotation, and the engagement shaft portion 3c of the roller cutter 3 using a wedge action. Since the engagement shaft portion 3c of the roller cutter 3 is fixed to the pair of holder members 25 in cooperation with the wedge member 33 capable of fixing the roller cutter 3, the excavation reaction force of the roller cutter 3 is almost applied to the wedge member 33. Instead, it can be received by the holder member 25 via the rotary member 32 in the first state, and the roller cutter 3 can be prevented from falling backward. As a result, it is possible to provide the cutter holder 23 having both functions of the conventional rotary method and the wedge method.

  Further, since it is not necessary to rotate the rotary member 32 by 180 degrees and it is not necessary to remove other members other than the roller cutter 3, the replacement work of the roller cutter 3 can be simplified and the time for the replacement work can be significantly shortened. It is possible to shorten the tunnel excavation work period. By fixing the engagement shaft portion 3c of the roller cutter 3 through the wedge action, it is possible to secure a binding force equivalent to that of the conventional wedge method, and therefore, compared to the conventional rotary method, Strength can be improved. Moreover, since it is not necessary to widen the spoke width of the cutter head 2 as in the conventional wedge system, it is possible to suppress a decrease in the opening ratio of the cutter head 2 and to prevent a decrease in excavation ability.

  Further, the first and second seats are formed in the respective housing recesses 26 with the open gaps 27a continuous with the open grooves 27 being formed and the seating surfaces each having a circular arc shape in cross section for receiving the rotary member 32 from the rear. Since the members 28 and 29 and the pair of bolts 31a and 31b for fixing the seat forming members 28 and 29 to the holder members 25 are provided, the seats made of a material harder than the holder member 25 are provided. By firmly fixing the forming members 28 and 29 to the holder member 25 with the bolt bolts 31a and 31b, plastic deformation (sagging) hardly occurs due to the excavation reaction force, and the durability of the cutter holder 23 is improved.

  Of the first and second seat forming members 28 and 29, the tip end portion 28b of the seat forming member 28 opposite to the wedge member 33 is forward of the vertical plane V including the axis of the engaging shaft portion 3c. Therefore, when the roller cutter 3 is replaced, the rotary member 32 is prevented from jumping forward. Since the rotary member 32 includes a stopper portion 32a for restricting the forward movement of the wedge member 33 when the roller cutter 3 is removed, the wedge member 33 jumps forward when the roller cutter 3 is replaced. To prevent. Since the rotary member 32 includes the flange portion 38 for restricting the movement of the roller cutter 3 in the axial direction, the rotary member 32 is prevented from dropping when the roller cutter 3 is replaced. That is, the workability of roller cutter replacement is improved by these structures.

  Since the rotary member 32 includes the thickened portion 39 to which the detachable tool 51 can be engaged, when the roller cutter 3 is replaced, the rotary member 32 can be smoothly engaged by engaging the detachable tool 51 with the thickened portion 39. The roller cutter 3 can be easily attached / detached by rotating the rotary member 32.

Next, a mode in which the above embodiment is partially changed will be described.
[1] In the above-described embodiment, the shape of the thickened portion 39 of the rotary member 32 and the shape of the detachable tool 51 are merely examples, so long as the rotary member 32 can be rotated. The shape of the thickened portion 39 and the shape of the detachable tool can be changed as appropriate.

[2] In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

DESCRIPTION OF SYMBOLS 1 Tunnel excavator 2 Cutter head 3 Roller cutter 3c Engagement shaft part 21 Cutter spoke 23 Cutter holder for roller cutters 25 Holder member 26 Accommodating recess 27 Opening groove 27a Opening gap 28 First receiving seat forming member 29 Second receiving seat Forming members 31a and 31b A pair of bolts 32 A rotary member 33 A wedge member 34 A bolt member 37 A stopper portion 38 A flange portion 39 A thickening portion 51 A tool for attaching and detaching

Claims (6)

In the cutter holder for the roller cutter that supports the roller cutter installed in the cutter head at the front end of the tunnel excavator,
A pair of holder members fixed to the cutter spokes of the cutter head and supporting a pair of engaging shafts at the end of the roller shaft of the roller cutter;
A pair of receiving recesses that are open on the front and formed on opposite wall portions of the pair of holder members facing each other ;
A pair of open grooves communicating with rear ends of the pair of receiving recesses and allowing the pair of engaging shafts to pass through;
Wherein a rotary member that will be accommodated in each accommodating recess, the engagement shaft portion of the roller cutter and a first state fixable was 90 ° rotation around the axis together with the engaging shaft portion of the roller cutter fixed releasable second state and conversion example possible rotary member outright over the,
A wedge member housed in each housing recess and capable of fixing the engaging shaft portion via a wedge action in cooperation with the rotary member in the first state;
A bolt member capable of driving the wedge members in the fastening direction from the rear of the roller cutter ,
In the state where the rotary member is in the second state, the pair of engaging shafts and the pair of open grooves are arranged on a straight line, and the engagement shafts pass through the open grooves and move backward. Cutter holder for roller cutters, characterized in that it can be removed .   First and second seat-forming members each having an arc-shaped seating surface in cross-section that is housed in each housing recess with an open gap continuous to the open groove and receives the rotary member from the rear; The cutter holder for a roller cutter according to claim 1, further comprising a pair of bolts for fixing the seat forming members to the holder members.   Of the first and second seat forming members, the tip of the seat forming member on the opposite side of the wedge member has the axis of the engaging shaft portion in a state where the cutter spoke is in a horizontal posture. The cutter holder for a roller cutter according to claim 2, wherein the cutter holder is located in front of a vertical plane including the roller holder.   The roller holder according to claim 1, wherein the rotary member includes a stopper portion for restricting the forward movement of the wedge member when the roller cutter is removed.   2. The cutter holder for a roller cutter according to claim 1, wherein the rotary member includes a flange portion for restricting movement of the roller cutter in the axial direction.   2. The cutter holder for a roller cutter according to claim 1, wherein the rotary member includes a thickened portion to which a detachable tool can be engaged.