JP2013127182A - Cutter holder for roller cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter holder which can shorten time for the operation of replacing a roller cutter, by simplifying the operation of replacing it.SOLUTION: A cutter holder 5 for a roller cutter comprises: a pair of holder members 9 having a pair of engaging shaft parts 3b of the roller cutter 3, and an engaging part 21 which supports the engaging shaft parts 3b of a roller shaft 3a of the roller cutter 3 and with which the engaging shaft parts 3b are engaged; an L-shaped groove 12 formed on each holder member 11, having a storage groove 16 which extends linearly in a direction parallel to a revolving direction of the roller cutter 3 around the shaft center of a cutter head 2 from the rear side end of the engaging part 21, and an open groove 17 which extends from the storage groove 16 toward the back side and is opened on the rear end side of the holder members 9; a lock member 13 stored in the storage groove 16 and held between the engaging shaft part 3b and the rear end wall surface 16a of the storage groove 16; and a wedge mechanism 14 which fastens the lock member 13 to a lock position.

Description

  The present invention relates to a cutter holder for a roller cutter, and more particularly to a cutter holder that can replace a roller cutter installed in a cutter head at a front end portion of a tunnel excavator from the rear side of the cutter head.

  Conventionally, in a tunnel excavator, a cutter head is provided on the front side of the fuselage, the cutter head is driven forward together with the fuselage, and the cutter head is rotationally driven to excavate a natural ground ahead to excavate the tunnel. In a tunnel excavator that excavates hard ground, a cutter head equipped with a plurality of roller cutters on the front surface is applied. If the roller cutter is worn out during tunnel excavation and the drilling capability is reduced, it is necessary to replace the worn roller cutter with a new roller cutter, especially a tunnel excavator that continuously excavates long-distance tunnels. Then, the frequency of replacing the roller cutter increases.

  Here, in the case where the roller cutter is detachably fixed from the front side 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 work is very large and time consuming, and an operator enters the cutter replacement gap, but it involves work such as the occurrence of water discharge. Therefore, a technique for exchanging the roller cutter from the rear side of the cutter head has been put into practical use.

  For example, in the technique of Patent Document 1, a pair of mounting seats corresponding to each roller cutter is fixed to the cutter head so as to face each other, and a rotary disk is engaged with each mounting seat in an open semicircular arc portion toward the front side. Has been. Both ends of a semicircular arc-shaped pressing member are fixed to the front end portion of the mounting seat with bolts, and a rotary disk is engaged with the pressing member so that the rotary disk is rotatably supported. The rotary disk is formed with a U-shaped cutout extending from the center to the outer peripheral end, and the support shaft end of the roller cutter is detachably engaged with the cutout.

  When the tunnel can be excavated, the support shaft end of the roller cutter is engaged with the inner end of the notch, and a spacer is inserted in a portion other than the inner end of the notch, and the open end of the notch is cut by the cutter. By tightening the bolt toward the front side of the head, the rotary disk is pressed by the pressing member, and the support shaft end portion of the roller cutter is fixed. The excavation reaction force of the roller cutter is received by the semicircular arc portion of the mounting seat via the rotary disk. When replacing the roller cutter, loosen the bolt and rotate the rotary disk 180 degrees, with the open end of the notch facing the rear side of the cutter head, and the notch is formed with an insertion groove formed in the mounting seat. Connect and remove the roller cutter by moving it backwards. When attaching a roller cutter, work in the reverse order.

JP 58-189497 A

  In the technique of Patent Document 1, in order to replace the roller cutter, an operator must rotate a pair of rotary disks together with the roller cutter by 180 degrees using a tool or the like. However, the roller cutter is very heavy (for example, about 100 to 300 kg), and earth and sand are caught in the gaps between these rotating parts, so the roller cutter and the pair of rotary disks are rotated 180 °. Rotating work takes a lot of labor and time (for example, about one hour per roller cutter).

  Similarly, after replacing the roller cutter, the pair of rotary disks must be rotated 180 ° together with the roller cutter. However, as described above, these rotating operations require a lot of labor and time. Further, a mechanism for rotating the rotary disk and a mechanism for preventing the rotation are necessary, and the structure is complicated.

  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. Providing a cutter holder for a roller cutter having a simple structure capable of ensuring the same strength as compared with the above.

  The cutter holder for a roller cutter according to claim 1 is an end portion of a roller shaft that rotatably supports the roller cutter in a cutter holder for a roller cutter that supports a roller cutter provided in a cutter head at a front end portion of a tunnel excavator. A pair of holder members that respectively support the pair of engaging shaft portions and have an engaging portion with which the engaging shaft portion engages, and an L-shaped groove formed in each of the holder members, A receiving groove extending linearly in a direction parallel to the circumferential direction of the roller cutter centering on the axis of the cutter head from the rear side end of the engaging portion, and the rear end of the holder member extending rearward from the receiving groove An L-shaped groove having an open groove opened to the side, a lock member received in the storage groove and sandwiched between the engagement shaft portion and a rear end wall surface of the storage groove, and the lock member It is characterized in that a wedge mechanism for fastening the locking position.

  A cutter holder for a roller cutter according to a second aspect is the invention according to the first aspect, wherein the wedge mechanism is formed on the lock member and approaches a side wall surface of the receiving groove facing the wedge mechanism toward the front end side. And a wedge member fitted between the inclined surface and the side wall surface in the housing groove, and a bolt member capable of driving the wedge member in the fastening direction. It is said.

  A cutter holder for a roller cutter according to a third aspect is the invention according to the first or second aspect, wherein the holder member is attached to the cutter head and has a holder main body formed with the L-shaped groove, and a front portion of the holder main body. And a holding member formed with the engaging portion, the holding member being fixed to the holder body by a pair of bolts operable from the rear side of the holder body. .

  The cutter holder for a roller cutter according to claim 4 is the invention according to claim 2, wherein after removing the bolt member and the wedge member, the lock member is removed by passing through the housing groove and the open groove, The roller cutter is configured to be removable to the rear of the holder member by removing the engagement shaft portion through the accommodation groove and the open groove.

  The cutter holder for a roller cutter according to claim 5 allows movement of the roller cutter in a direction parallel to the accommodation groove when the engagement shaft portion is moved in the accommodation groove in the invention of claim 4. It is characterized by providing a space for moving the roller cutter.

  According to the invention of claim 1 (the cutter holder for the roller cutter), the excavation reaction force of the roller cutter can be received by the pair of holder members via the lock member without acting on the wedge mechanism. Can be prevented from falling off. As a result, it is possible to provide a cutter holder for a roller cutter having a simple structure as well as ensuring the same strength as the conventional one.

  Further, when replacing the roller cutter, the fastening of the lock member by the wedge mechanism is released from the rear of the cutter head, and the wedge mechanism and the lock member can be sequentially removed backward from the L-shaped groove without interfering with the roller cutter. Thereafter, the engagement shaft portion of the roller cutter can be passed through the L-shaped groove from the rear, and the roller cutter can be moved backward to be removed.

  Then, the engaging shaft portion of the new roller cutter is passed through the L-shaped groove, the roller cutter is moved to the front side, and the engaging shaft portion of the roller cutter is engaged with the engaging portion. The mechanism can be mounted sequentially from the rear without interfering with the roller cutter into the L-shaped groove receiving groove.

  As a result, even if the sand and sand is caught between the roller cutter and the cutter holder, and the roller cutter cannot be rotated, the pair of engaging shafts of the roller cutter can be removed without rotating. Therefore, it will not hinder the replacement. Since a conventional mechanism for rotating the rotary disk and a mechanism for preventing the rotation are not required, the structure can be simplified. Also, the roller cutter replacement operation is simplified, the replacement operation time can be significantly shortened, and the tunnel excavation work period can be shortened.

  According to the second aspect of the present invention, the wedge member is driven in the fastening direction (the direction in which the lock member is fastened to the lock position) by the bolt member, so that the wedge is caused by the wedge action between the wedge member and the inclined surface of the lock member. It can be expected that the wedge member and the lock member are reliably integrated with the holder member by pressing the member and the lock member against the receiving groove. Moreover, since the wedge member is fitted between the inclined surface of the lock member and the side wall surface in the accommodation groove, the wedge member can be easily removed rearward. Further, since the wedge member does not directly receive the excavation reaction force of the roller cutter, it is possible to prevent the bolt member from coming off.

  According to the invention of claim 3, since the holding member is fixed to the holder body by the pair of bolts operable from the rear side of the holder body, the pair of bolt members are operated from the rear of the cutter head, By fixing the pressing member to the holder body, the engaging shaft portion of the roller cutter can be reliably fixed to the front portion of the holder body. In addition, since the roller cutter is supported by the holder member by the cooperation of the pressing member and the wedge mechanism, it can be expected that various fixing bolts are prevented from loosening due to vibration during tunnel excavation.

  According to the invention of claim 4, after removing the bolt member and the wedge member, the lock member is removed by passing through the receiving groove and the open groove, and then the engaging shaft portion is passed through the receiving groove and the open groove. Since the roller cutter can be removed to the rear of the holder member by removing the roller cutter, the replacement work of the roller cutter can be simplified and the time for the replacement work can be significantly shortened.

  According to the invention of claim 5, since the roller cutter moving space for allowing the roller cutter to move in a direction parallel to the receiving groove is provided when the engaging shaft portion is moved in the receiving groove, the roller The cutter can be moved and exchanged smoothly without causing interference with other members.

It is a front view of the cutter head of the front-end part of the tunnel excavator which concerns on Example 1. FIG. It is a rear view of the cutter holder for roller cutters. It is the III-III sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the disassembled state of the cutter holder for roller cutters. It is a front view of the cutter holder for roller cutters of the state which removed the pressing member concerning Example 2. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is a longitudinal cross-sectional view of the cutter holder for roller cutters which concerns on a partial change form.

  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 roller cutter 3 in a cutter head 2. The direction indicated by the arrow A in FIGS. 3 and 4 is the front of the tunnel excavator 1 and the direction indicated by the arrow B in FIGS. 1 to 4 is the rotation direction of the roller cutter 3 (the axis of the cutter head 2). 1 is a radial direction of the cutter head 2 (radial direction extending outward from the center of the cutter head 2).

  In FIG. 1, only the cutter head 2 of the tunnel excavator 1 is shown. The tunnel excavator 1 basically includes a cutter head 2, an excavator main body (not shown) on which the cutter head 2 is rotatably supported on the front side, and a chamber on the back side of the cutter head 2 (not shown). , A rotation drive mechanism (not shown) for rotating the cutter head 2, a plurality of shield jacks (not shown), and the like, and a plurality of roller cutters 3 provided on the front surface of the cutter head 2 Of structure.

  In this tunnel excavator 1, the cutter head 2 is driven forward by a plurality of shield jacks and rotated by a rotary drive mechanism to excavate a natural ground ahead and excavate the tunnel. The cutter head 2 is provided with a plurality of roller cutter cutter holders 5 (hereinafter referred to as cutter holders 5) for detachably mounting a plurality of roller cutters 3 from the rear side of the cutter head 2, respectively. Yes.

  Here, the cutter head 2 includes, for example, a head central portion 2a, a plurality of cutter spokes 2b extending in a radial direction from the head central portion 2a, and an outer peripheral ring 2c connected to the outer peripheral ends of the cutter spokes 2b. In addition, a plurality of roller cutters 3 are attached to these substantially uniformly and with the roller shaft 3a directed in the radial direction.

  A portion of the cutter head 2 to which each roller cutter 3 is attached is provided with a pair of attachment plate portions 4 that are part of the cutter spoke 2b. The pair of mounting plate portions 4 are arranged in a face-to-face manner with a larger interval than the diameter of the cutter ring 3c of the roller cutter 3, and the cutter holder 5 is provided on these mounting plate portions 4 (see FIG. 2). ).

Next, the cutter holder 5 will be described.
As shown in FIGS. 2 to 4, the cutter holder 5 is for rotatably supporting the roller cutter 3 mounted on the cutter head 2 at the front end of the tunnel excavator 1, and rotates the roller cutter 3. A pair of holder members 9 that support a pair of engaging shafts 3b at the end of the roller shaft 3a that is freely supported, an L-shaped groove 12 formed in each holder member 9, and a A lock member 13 and a wedge mechanism 14 are provided. In the following description, the cutter holder 5 is described as an example attached to a plane portion (center portion) orthogonal to the axis of the cutter head 2.

Next, the holder member 9 will be described.
In each cutter holder 5, a pair of holder members 9 are fixed to and engaged with a pair of holder main bodies 10 attached to the cutter head 2 and formed with L-shaped grooves 12, respectively, and the front portions of the holder main bodies 10. A pair of holding members 11 each formed with a joint portion 21, and between the pair of mounting plate portions 4 so as to be orthogonal to the mounting plate portion 4 and from the width in the roller axial direction of the hub 3 d of the roller cutter 3. However, they are arranged symmetrically in a face-to-face manner with a slightly large gap. A pair of engaging shaft portions 3b of the roller cutter 3 are detachably fixed to the pair of holder members 9, respectively.

Next, the holder body 10 will be described.
Each holder main body 10 has a thickness in the radial direction (roller axial direction) of the cutter head that is about 1.5 times the length of the engaging shaft portion 3b of the roller cutter 3, and is substantially rectangular when viewed from the radial direction. It is formed into a shape. Both end portions of each holder body 10 in the circumferential direction are fixed to the inner surface of the pair of mounting plate portions 4 by a block member 4a, a bolt member 4b, welding or the like. The front end portion of each holder main body 10 projects in a trapezoidal shape slightly forward from the mounting plate portion 4, and the roller cutter 3 supported by the holder main body 10 protrudes forward from the holder main body 10.

  Further, in each holder main body 10, the front opening in FIG. 3 has an insertion recess 15 that is open to the front in the thickness direction in the radial direction substantially the same as the length of the engagement shaft portion 3 b of the roller cutter 3 from the inner surface side in FIG. And the L-shaped groove | channel 12 continuing to the rear end of this insertion recessed part 15 is formed. The L-shaped groove 12 includes an accommodation groove 16 linearly extending in a direction parallel to the circumferential direction of the roller cutter 3 from the rear side end of the engaging portion 21 formed in the pressing member 11, and the circumferential direction of the accommodation groove 16. It consists of an open groove 17 extending rearward from one end side portion (upper end side portion in FIGS. 3 and 4) and opened to the rear end side of the holder body 10. The groove width of the L-shaped groove 12 (the groove width of the open groove 17 and the accommodation groove 16) is formed slightly larger than the length of the engagement shaft portion 3b of the roller cutter 3. The open groove 17 and the accommodation groove 16 are formed at the same depth.

  In addition, the cutter holder 5 has a direction parallel to the housing groove 16 of the roller cutter 3 when the engaging shaft portion 3b of the roller cutter 3 is moved in the housing groove 16 of the L-shaped groove 12 of the holder body 10 (circular rotation). A space 18 for moving the roller cutter for allowing movement in the direction) is provided between the pair of holder bodies 10 and in the vicinity of the mounting plate portion 4 on the moving direction side when the roller cutter 3 is taken out. Yes (see FIG. 2).

Next, the pressing member 11 will be described.
As shown in FIGS. 2 to 4, a pair of pressing members 11 are detachably attached to the insertion recesses 15 of the holder main bodies 10. A pair of bolts 19 that can be operated from the rear side of each holder main body 10 are respectively inserted into the bolt insertion holes 10a and screwed into the pair of presser members 11. The presser members are held on the holder main body 10 by the pair of bolts 19. 11 is fixed respectively. The front end portion of each pressing member 11 protrudes in a trapezoidal shape slightly forward from the mounting plate portion 4 so as to coincide with the shape of the front end portion of the holder body 10.

  The pressing member 11 has an engaging portion 21 that is formed at the rear end portion thereof and from which the engaging shaft portion 3b of the roller cutter 3 can be engaged and disengaged from the rear. In a state where the presser member 11 is fixed to the insertion recess 15, the front end side portion of the receiving groove 16 of the L-shaped groove 12 is connected to the rear end of the engaging portion 21 of the presser member 11. In a state where the pressing member 11 is mounted on the holder body 10, a slight gap 11 b is formed between the rear end surface of the pressing member 11 and the rear end wall surface of the fitting recess 15. Therefore, the engagement shaft portion 3 b engaged with the engagement portion 21 of the presser member 11 can be reliably brought into contact with and held by the lock member 13.

Next, the lock member 13 will be described.
As shown in FIGS. 2 to 4, the lock member 13 has a thickness in the roller axial direction (radial direction) substantially the same as the depth of the L-shaped groove 12, and is formed in a trapezoidal shape when viewed from the roller axial direction. Yes. The lock member 13 is accommodated in the other end side portion (the lower end side portion in FIGS. 3 and 4) of the accommodating groove 16 in the circumferential direction, and is rearward between the engagement shaft portion 3 b and the rear end wall surface 16 a of the accommodating groove 16. It is pinched immovably. The lock member 13 abuts on the engagement shaft portion 3b from the rear, and holds the engagement shaft portion 3b on the engagement portion 21 of the presser member 11.

The length of the locking member 13 in the circumferential direction is slightly smaller than the length (groove width) of the opening groove 17 in the circumferential direction. Therefore, the lock member 13 can be attached to and detached from the receiving groove 16 through the open groove 17.
One end surface (the upper end surface in FIGS. 3 and 4) of the lock member 13 in the circumferential direction is inclined so as to approach the side wall surface 16 b of the receiving groove 16 facing the wedge mechanism 14 on the front end side. Is formed. At both ends of the inclined surface 13a, projecting edge portions 13b slightly projecting toward the wedge member 23 are formed, and the movement of the lock member 13 toward the roller cutter 3 is restricted.

Next, the wedge mechanism 14 will be described.
As shown in FIGS. 2 to 4, the wedge mechanism 14 is for fastening the lock member 13 to the lock position in the housing groove 16, and the above-described inclined surface 13 a formed on the lock member 13 and the housing. A wedge member 23 fitted between the inclined surface 13a and the side wall surface 16b of the accommodation groove 16 in the groove 16 and a direction in which the wedge member 23 approaches the pressing member 11 (the lock member 13 is fastened to the lock position). And a bolt member 24 that can be driven in the fastening direction).

  The wedge member 23 has a thickness in the roller axial direction (radial direction) substantially the same as the depth of the L-shaped groove 12 and is formed in a trapezoidal shape as viewed from the roller axial direction. The length of the wedge member 23 in the circumferential direction is formed slightly smaller than the length (groove width) of the open groove 17 in the circumferential direction. Thus, it can be fitted between the inclined surface 13 a of the lock member 13 and the side wall surface 16 b of the receiving groove 16.

  A tapered portion 23a that is inclined in the same direction as the inclined surface 13a is formed on the side surface of the wedge member 23 that faces the inclined surface 13a of the lock member 13. The taper portion 23 a is formed with an engaging convex portion 23 b, and the engaging convex portion 23 b is in contact with the inclined surface 13 a of the lock member 13. Movement of the wedge member 23 in the radial direction can be restricted by the engaging convex portion 23b and the protruding edge portion 13b. The wedge member 23 is formed with a bolt insertion hole 23c extending in the front-rear direction.

  According to the wedge mechanism 14, the bolt member 24 is inserted from the rear into the bolt insertion hole 23 c of the wedge member 23 in a state where the lock member 13 and the wedge member 23 are accommodated in the accommodation groove 16, and the distal end portion is the presser member. 11, when the wedge member 23 is inserted in a direction approaching the presser member 11 by the bolt member 24, the wedge action between the inclined surface 13 a of the lock member 13 and the taper portion 23 a of the wedge member 23 occurs. The wedge member 23 and the lock member 13 are pressed and fitted between the side wall surfaces 16b and 16c of the receiving groove 16 to be in a fixed state, and the lock member 13 can be fastened to the lock position.

Next, the operation and effect of the cutter holder 5 of the present invention will be described.
In a use state where the tunnel can be excavated, the engagement shaft portion 3 b of the roller cutter 3 is engaged with the engagement portion 21 of the presser member 11 fixed to the holder body 10, and the lock member 13 is accommodated in the receiving groove of the holder body 10. 16 is mounted on the side opposite to the open groove side, and the wedge member 23 is the open groove side portion of the receiving groove 16 and is fitted between the inclined surface 13a of the lock member 13 and the side wall surface 16b of the receiving groove 16. Has been. At this time, in the wedge mechanism 14, the inclined surface 13 a of the lock member 13 and the tapered portion 23 a of the wedge member 23 are engaged, and the wedge member 23 is fastened and fixed to the presser member 11 by the bolt member 24.

  Thus, since the lock member 13 is sandwiched between the engagement shaft portion 3b and the rear end wall surface 16a of the receiving groove 16, movement in the front-rear direction is restricted, and the wedge member 23 is fastened by the bolt member 24. Thus, a wedge action is produced between the inclined surface 13 a of the lock member 13 and the tapered portion 23 a of the wedge member 23. For this reason, the wedge member 23 and the lock member 13 are pressed and fitted between the side wall surfaces 16b and 16c of the receiving groove 16 to be in a fixed state, and the lock member 13 is fastened to the lock position. Since the portion 3 b is held by the engaging portion 21, the excavation reaction force of the roller cutter 3 is received by the holder body 10 via the lock member 13 and does not act on the wedge mechanism 14.

  When replacing the roller cutter 3, the bolt member 24 and the pair of bolts 19 are loosened from the rear of the cutter head 1, and the bolt member 24 and the wedge member 23 are removed rearward from the open groove 17 and then locked. The member 13 is removed through the receiving groove 16 and the open groove 17 to the rear side. In this case, since the open groove 17 of the L-shaped groove 12 is formed in a rear open shape, the wedge member 23 and the lock member 13 can be removed rearward without interfering with the roller cutter 3, Since the tapered portion 23a of the wedge member 23 is engaged with the inclined surface 13a of the lock member 13, the wedge member 23 can be easily removed rearward from between the inclined surface 13a and the side wall surface 16b.

  Thereafter, the roller cutter 3 can be removed to the rear of the holder body 10 by passing the engagement shaft portion 3b of the roller cutter 3 through the receiving groove 16 and the open groove 17 and removing it to the rear side (see FIG. 4). . At this time, since the roller cutter moving space 18 is provided, the roller cutter 3 can be removed without interfering with the mounting plate portion 4.

  Next, the engagement shaft portion 3 b of the new roller cutter 3 is passed through the L-shaped groove 12, the roller cutter 3 is moved to the front side, and the engagement shaft portion 3 b is engaged with the engagement portion 21. Thereafter, the lock member 13 is mounted from the rear on the opposite side (engagement shaft portion side) of the receiving groove 16 of the L-shaped groove 12 in the reverse procedure to the above, and the wedge member 23 is attached to the receiving groove. It mounts | wears with the open groove side part of 16 from back. In this case, the wedge member 23 can be easily inserted between the inclined surface 13a and the side wall surface 16b by the inclined surface 13a of the lock member 13 and the tapered portion 23a of the wedge member 23.

  Then, the pair of bolts 19 are tightened to pull the presser member 11 backward, the presser member 11 is fixed to the holder body 10, the bolt member 24 is tightened, and the wedge member 23 is fastened to the presser member 11 to lock the lock member 13. Is fastened to the lock position, the engagement shaft portion 3b of the roller cutter 3 is finally fixed, and the replacement operation of the roller cutter 3 is completed.

  Thus, the excavation reaction force of the roller cutter 3 can be received by the holder main body 10 via the lock member 13 without acting on the wedge mechanism 14, and the bolt member 24 in the wedge mechanism 14 is not loosened. Therefore, it is possible to prevent the roller cutter 3 from falling off. As a result, it is possible to provide the cutter holder 5 having a simple structure as well as ensuring the same strength as the conventional one.

  Even if the sand and sand is caught between the roller cutter 3 and the cutter holder 5 and the roller cutter 3 is not rotatable, the pair of engagement shaft portions 3b of the roller cutter 3 are not rotated. Since it is removable, it will not hinder the replacement. Moreover, the structure of the cutter holder 5 can be simplified.

  The replacement work of the roller cutter 3 is simplified, and the time for the replacement work can be shortened remarkably, especially when excavating a very hard ground (hard rock part) or continuously excavating a long distance tunnel. However, the tunnel excavation period can be shortened. Furthermore, since the roller cutter 3 is supported by the holder member 9 by the cooperation of the pressing member 11 and the wedge mechanism 14, it can be expected that various fixing bolts are prevented from loosening due to vibration during tunnel excavation.

  When the wedge member 23 is driven by the bolt member 24 in the fastening direction for fastening the lock member 13 to the lock position, the wedge member 23 and the lock member 13 are driven by the wedge action of the wedge member 23 and the inclined surface 13a of the lock member 13. The wedge member 23 and the lock member 13 can be reliably integrated with the holder member 9 by pressing the housing groove 16. Further, since the wedge member 23 is fitted between the inclined surface 13a and the side wall surface 16b of the accommodation groove 16 in the accommodation groove 16, the wedge member 23 can be easily removed rearward. Since the wedge member 23 does not directly receive the excavation reaction force of the roller cutter 3, it is possible to prevent the bolt member 24 from coming off.

  Since the holding member 11 is fixed to the holder body 10 by a pair of bolts 19 that can be operated from the rear side of the holder body 10, the pair of bolts 19 are operated from the rear side of the cutter head 2 to operate the holding member 11. Is fixed to the holder body 10, the engagement shaft portion 3 b of the roller cutter 3 can be reliably fixed to the front portion of the holder body 10.

  Since the roller cutter moving space 18 is provided to allow the roller cutter 3 to move in a direction parallel to the housing groove 16 when the engagement shaft portion 3b is moved in the housing groove 16, the roller cutter 3 is replaced with another one. It can be moved and exchanged smoothly without interfering with other members.

Next, although the modified form which changed the cutter holder 5 of Example 1 partially is demonstrated, the same referential mark is attached | subjected to the structure similar to Example 1, and description is abbreviate | omitted.
As shown in FIGS. 5 and 6, the cutter holder 5A includes a pair of holder members 9A, L-shaped grooves 12A formed in each holder member 9A, lock members 13A provided in each holder member 9A, and And a wedge mechanism 14A.

  The pair of holder members 9A includes a pair of holder main bodies 10A each formed with an L-shaped groove 12A, and a pair of presser members 11 fixed to the front portion of each holder main body 10A via bolts 19A. However, except that the shape of the L-shaped groove 12A is different from that of the first embodiment, the holder main body 10A and the holding member 11 have basically the same structure as that of the first embodiment. Only 12A will be described.

Next, the L-shaped groove 12A will be described.
As shown in FIG. 6, the L-shaped groove 12 </ b> A includes an accommodation groove 16 </ b> A formed longer in the circumferential direction than the accommodation groove 16 of the first embodiment, and one end side portion in the circumferential direction of the accommodation groove 16 </ b> A (the upper end side in FIG. 6). The open groove 17A is wider than the open groove 17 of the first embodiment and extends rearward from the portion) to the rear end side of the holder body 10A. The housing groove 16A has a length that is about 1/2 to 2/3 times the length of the insertion recess 15 in the circumferential direction, and the engaging portion 21 is in a state where the pressing member 11 is fixed to the holder body 10A. The rear end is connected to the middle portion of the front end side of the accommodation groove 16A.

Next, the lock member 13A will be described.
As shown in FIGS. 5 and 6, the lock member 13 </ b> A has a thickness in the roller axial direction (radial direction) substantially the same as the depth of the L-shaped groove 12 </ b> A, and has an elongated trapezoidal shape when viewed from the roller axial direction and from the front. Is formed. The lock member 13A is housed in the housing groove 16A and is sandwiched between the engagement shaft portion 3b and the rear end wall surface 16Aa of the housing groove 16A so as not to move backward, and comes into contact with the engagement shaft portion 3b from the rear. The engagement shaft portion 3 b is held by the engagement portion 21 of the presser member 11.

  The length in the longitudinal direction (circumferential direction) of the lock member 13A is slightly smaller than the length (groove width) of the open groove 17A in the circumferential direction. Therefore, the lock member 13A can be attached to and detached from the accommodation groove 16A through the open groove 17A even in the posture shown in FIG.

  An inclined surface 13Aa is formed on one end surface (upper end surface in FIG. 6) of the lock member 13A in the circumferential direction. The inclined surface 13Aa is inclined so as to approach the side wall surface 16Ab of the accommodating groove 16A facing the wedge mechanism 14A on the front end side (see FIG. 6), and the wedge mechanism 14A is sandwiched on the roller cutter 3 side. It inclines so that it may approach side wall surface 16Ab of the accommodation groove | channel 16A which opposes (refer FIG. 5).

  A flat surface 13Ac that contacts the side wall surface 16Ac of the housing groove 16A is formed on the other end surface (the lower end surface in FIG. 6) of the lock member 13A in the circumferential direction. An extending inclined surface 13Ad is formed, and a gently curved curved surface 13Ae is formed on the opposite front side.

  According to the lock member 13A, when the lock member 13A is inserted into the receiving groove 16A, the holding member 11 is held by the curved surface 13Ae even if the lock member 13A is inserted into the open groove 17A in a posture orthogonal to the storage groove 16A. The lock member 13A can be smoothly changed in direction within the L-shaped groove 12A and inserted into the receiving groove 16A without being caught by the engagement shaft portion 3b, so that the attaching operation of the lock member 13A becomes smooth. .

  Further, when releasing the fastening of the lock member 13A, after removing the wedge member 23A, the bolt 31 is screwed into the screw hole 32 of the holder main body 10A from the rear, and the inclined surface of the lock member 13A is formed at the tip of the bolt 31. When 13Ad is pressed, the lock member 13A can be pressed and moved to the fastening release side (the upper side in FIG. 6), and thus the lock member 13A can be easily removed from the accommodation groove 16A.

Next, the wedge mechanism 14A will be described.
As shown in FIGS. 5 and 6, the wedge mechanism 14A is for fastening the lock member 13A to the lock position in the accommodation groove 16A. The wedge mechanism 14A includes the above-described inclined surface 13Aa formed on the lock member 13A and the accommodation. A wedge member 23A in which the front portion is fitted between the inclined surface 13Aa and the side wall surface 16Ab of the housing groove 16A in the groove 16A, and a direction in which the wedge member 23A approaches the presser member 11 (the lock member 13A is locked) And a pair of bolt members 24A that can be driven in a fastening direction).

  The wedge member 23A has a thickness in the roller axial direction (radial direction) substantially the same as the depth of the L-shaped groove 12, and is formed in a convex shape when viewed from the roller axial direction. The length in the circumferential direction of the portion of the wedge member 23A excluding the flange portion 23Ab is formed slightly smaller than the length in the circumferential direction of the open groove 17A. Therefore, the wedge member 23A can be inserted into the open groove 17a, and the front portion thereof can be fitted between the inclined surface 13Aa of the lock member 13A and the side wall surface 16Ab of the storage groove 16A in the storage groove 16a.

  The tapered portion 23Aa is formed on the side surface of the front portion of the wedge member 23A that faces the inclined surface 13Aa of the lock member 13A, and is inclined in the same direction as the inclined surface 13Aa. At the rear end portion of the wedge member 23A, a flange portion 23Ab protruding in the circumferential direction is formed. A pair of bolt insertion holes 23Ac is formed at both ends of the flange 23Ab.

  According to the wedge mechanism 14A, a pair of bolt members 24A are inserted from the rear into the pair of bolt insertion holes 23Ac of the wedge member 23A in a state where the lock member 13A and the wedge member 23A are accommodated in the accommodation groove 16A. The tip portions are respectively screwed into the pair of bolt holes of the holder main body 10A, and the wedge member 23A is inserted in the direction approaching the pressing member 11A by the pair of bolt members 24A.

  Then, due to the wedge action between the inclined surface 13Aa of the lock member 13A and the tapered portion 23Aa of the wedge member 23A, the wedge member 23A and the lock member 13A are pressed and inserted between the side wall surfaces 16Ab and 16Ac of the receiving groove 16A and fixed. It becomes a state. At this time, since the lock member 13A is slightly moved and fixed to the roller cutter 3 side, the lock member 13A can be fastened to the lock position with the backlash of the lock member 13A being suppressed. Since other operations and configurations are the same as those of the first embodiment, description thereof is omitted.

Next, a mode in which the first and second embodiments are partially changed will be described.
[1] As shown in FIG. 7, the holder main bodies 10 and 10 </ b> A and the pressing member 11 may be integrally configured like each holder member 9 </ b> B of the cutter holder 5 </ b> B. According to this configuration, by omitting the presser member 11, the number of constituent members of the cutter holder 5B can be reduced, and the cutter holder 5B can be easily assembled.

[2] A hard facing that is built up with a weld bead may be formed on the front surface portion of the pair of presser members 11.

[3] The bolt insertion hole 23 c may be formed in a bolt hole having a diameter larger than that of the bolt member 24. According to this configuration, even when the wedge member 23 is firmly fixed to the receiving groove 16 after the bolt member 24 is removed when the wedge member 23 is removed, the bolt corresponding to the bolt hole is fastened. Then, the wedge member 23 can be easily detached from the housing groove 16 by pulling the wedge member 23 backward through the bolt.

[4] In addition, those skilled in the art can implement the present invention by adding 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 3a Roller shaft 3b Engagement shaft part 5, 5A, 5B Cutter holder 9, 9A, 9B for roller cutters Holder member 10, 10A Holder main body 11 Holding member 12, 12A L-shaped groove 13 , 13A Locking member 13a, 13Aa Inclined surface 14, 14A Wedge mechanism 16, 16A Housing groove 16a, 16Aa Rear end wall surface 16b, 16Ab Side wall surface 17, 17A Opening groove 18 Roller cutter moving space 19, 19A Bolt 21 Engaging portion 23 , 23A Wedge member 24, 24A Bolt member

Claims (5)

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 that respectively support a pair of engaging shafts at the end of a roller shaft that rotatably supports the roller cutter and have engaging portions with which the engaging shafts engage;
An L-shaped groove formed in each holder member, the receiving groove extending linearly in a direction parallel to the circumferential direction of the roller cutter around the axis of the cutter head from the rear side end of the engaging portion And an L-shaped groove having an open groove extending rearward from the housing groove and opened to the rear end side of the holder member;
A locking member received in the receiving groove and sandwiched between the engagement shaft portion and a rear end wall surface of the receiving groove;
A wedge mechanism for fastening the lock member to a lock position;
A cutter holder for a roller cutter, comprising:   The wedge mechanism includes an inclined surface that is formed on the lock member and is inclined so as to approach a side wall surface of the receiving groove facing the wedge mechanism toward the front end side, the inclined surface in the receiving groove, and the The cutter holder for a roller cutter according to claim 1, further comprising a wedge member fitted between the side wall surface and a bolt member capable of driving the wedge member in a fastening direction. The holder member includes a holder main body attached to the cutter head and formed with the L-shaped groove, and a pressing member fixed to the front portion of the holder main body and formed with the engaging portion.
The cutter holder for a roller cutter according to claim 1 or 2, wherein the pressing member is fixed to the holder body by a pair of bolts operable from the rear side of the holder body.   After removing the bolt member and the wedge member, the lock member is removed by passing through the accommodation groove and the release groove, and then the engagement shaft portion is passed through the accommodation groove and the release groove. The roller cutter cutter holder according to claim 2, wherein the roller cutter is configured to be removable to the rear of the holder member by being removed. 5. A space for moving a roller cutter for allowing movement of the roller cutter in a direction parallel to the housing groove when the engagement shaft portion is moved in the housing groove is provided. The cutter holder for roller cutters as described in 2.