JP4135952B2 - Roller cutter fixing device for tunnel excavator - Google Patents

Description

  The present invention relates to a device for removably fixing a roller cutter mounted on a front surface of a cutter head 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, the cutter head is rotated, and the tunnel is excavated by excavating the front ground. In tunnel excavators that excavate hard ground, a cutter head equipped with a plurality of roller cutters on the front is applied. Need to be replaced with a new roller cutter, especially in a tunnel excavator that continuously excavates a long distance tunnel, 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 (front 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 takes a long time, and there is a risk that an operator may enter the cutter replacement gap. 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 rotor disk is engaged with a semicircular arc portion formed from the front side of each mounting seat. Yes. Both end portions of a semicircular arc-shaped pressing member are fixed to the front end portion of the mounting seat with bolts, and the rotor disk is engaged with the pressing member to rotatably support the rotor disk. The rotor disk is formed with a notch portion extending from the center portion to the outer peripheral end, and the support shaft end portion of the roller cutter is detachably engaged with the notch portion.

  In a state where the tunnel can be excavated, the support shaft end portion of the roller cutter is engaged with the inner end portion of the notch portion, a spacer is inserted in a portion other than the inner end portion of the notch portion, and the open end of the notch portion is connected to the cutter head. By tightening the bolt toward the front side, the rotor disk is pressed by the pressing member, and the support shaft end 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 rotor disk. When replacing the roller cutter, the bolt is loosened, the rotor disk is rotated 180 degrees, the open end of the notch is directed to the rear side of the cutter head, and the notch is formed in an insertion groove formed in the mounting seat. Connect and remove the roller cutter by moving it backwards. When attaching the roller cutter, the work is performed in the reverse order.

  On the other hand, in the cutter head of Patent Document 2, a pair of saddles corresponding to the roller cutters are fixed to the cutter spokes so as to face each other, and each saddle is formed with a semicircular arc portion at a substantially central portion. A rectangular cutout portion communicating with the rectangular cutout portion is formed, and a tapered cutout portion communicating with the rectangular cutout portion and opened rearward is formed. In a state where the tunnel can be excavated, the bearing bracket is engaged with the rectangular cutout portion, and the end of the support shaft of the roller cutter is fitted into the hole formed by the semicircular arc portion and the saddle semicircular arc portion formed in the bearing bracket. The

  Further, a pair of bearing fixing brackets are inserted into the tapered notches, and the tapered portions of these bearing fixing brackets are respectively engaged with the pair of tapered portions of the tapered notches, and the inner ends of the pair of bearing fixing brackets facing each other. The convex part of the convex presser flange is inserted between the two parts, and both end parts of the presser flange are fastened with bolts to the rear end part of the saddle, and the support shaft end part of the roller cutter is fixed. The excavation reaction force of the roller cutter is received by the tapered portion of the saddle and the convex portion of the presser flange via the bearing fitting and the bearing fixing fitting. When replacing the roller cutter, loosen the bolt, remove the presser flange, the pair of bearing fixing brackets, and the bearing bracket, then remove the roller cutter to the rear, and when installing the roller cutter, Work in reverse order.

JP 58-189497 A Japanese Patent No. 3649536

In the technique of Patent Document 1, in order to replace the roller cutter, an operator uses a tool or the like to rotate a pair of rotor disks together with the roller cutter by 180 degrees. It shall be allowed to 180 degrees rotation of the pair of rotor disk with cutters. Since the roller cutter is very heavy (for example, about 200 kg) and the rotor disk supporting the roller cutter is also heavy (for example, about 20 kg per piece), the rotation work of the roller cutter and the pair of rotor disks is very large. This is a time-consuming and laborious task, and the problem becomes more pronounced if the roller cutter and rotor disk are misaligned. Further, a mechanism for rotating the rotor disk and a mechanism for preventing the rotation are necessary, and the structure is complicated.

  On the other hand, in the technique of Patent Document 2, it is not necessary to rotate the rotor disk together with the roller cutter in order to replace the roller cutter. However, the opposing inner end portions of the pair of bearing fixing brackets mounted on the saddle are parallel to each other, and the convex portion of the presser flange is inserted between them, and the pair of bearings receiving the excavation reaction force on the convex portion When the fixing bracket is strongly engaged and bites and the roller cutter is replaced, it may be difficult to pull out the convex portion of the presser flange from between the pair of bearing fixing brackets.

  In addition, after replacing the roller cutter, the convex portion of the presser flange must be inserted between a pair of bearing fixing brackets whose inner end portions that face each other are parallel to each other. Is not structured in a phase-separated state, it may be difficult to insert the convex portion of the presser flange between the pair of bearing fixing brackets. It takes a lot of work.

In other words, since it takes a long time to replace multiple roller cutters, the tunnel excavation period becomes longer, especially when excavating very hard ground (hard rock), or when continuously excavating long distance tunnels However, since the frequency of replacing the roller cutter becomes high, such a problem becomes more remarkable.
An object of the present invention is to provide a roller cutter fixing device for a tunnel excavator that can simplify the replacement work of the roller cutter and reduce the time of the replacement work.

The roller cutter fixing device for a tunnel excavator according to claim 1 is a roller cutter fixing device for removably fixing a roller cutter mounted on the front surface of the cutter head of the tunnel excavator from the rear side of the cutter head. And a cutter mounting member formed with a bearing recess in which the support shaft end of the roller cutter can be engaged and disengaged from the rear side, and a rear opening of the bearing recess formed on the cutter mounting member. A pair of square groove-shaped engaging recesses formed in a phase-separating manner on opposite sides of the fixing member receiving recess and the side of the fixing member receiving recess, and the bearing recess side end of the fixing member receiving recess A first fixing member that is detachably mounted from the side and holds the end of the support shaft of the roller cutter in the bearing recess, and is detachable from the rear side in the fixing member receiving recess in which the first fixing member is mounted; A pair of second fixing members that are mounted in a spaced manner to support the first fixing member from the rear side, and are each engaged with a pair of engaging recesses so as not to move backward. The first fixing member is detachably mounted from the rear side between the pair of second fixing members provided and the pair of second fixing members of the fixing member receiving recess, and is fastened to the first fixing member by the fastening member. And a pair of taper surfaces that extend rearward on opposite surfaces of the pair of second fixing members, and the third fixing member engages with the pair of tapered surfaces. The pair of second fixing members is fixed to the first fixing member by being inserted into the bolt insertion holes of the pair of second fixing members from the rear side and screwed into the first fixing member. The bolt member is provided with a bolt insertion hole having a diameter larger than that of the bolt member, and the first and second fixing members are fixed member receiving recesses. In mounted state, characterized in that the third fixing member by fastening members first by a bolt member as well as fastening the first fixing member, and configured to be able to slack prevented by fastening the second fixing member.

  In a state where the tunnel can be excavated, the support shaft end portion of the roller cutter is engaged with the bearing recess portion of the cutter mounting member, and the first fixing member is mounted on the bearing recess side end portion of the fixing member receiving recess portion of the cutter mounting member. And the pair of second fixing members are mounted in the fixing member receiving recesses in a phase-separated manner, and the engaging portions of the pair of second fixing members are phase-separated in a mutually opposing manner on the sides of the fixing member receiving recesses. Each is engaged with the formed pair of square groove-shaped engaging recesses. Further, the third fixing member is mounted between the pair of second fixing members of the fixing member receiving recesses, and a pair of rearward spreads formed on the opposing surfaces of the pair of second fixing members. A pair of taper portions formed on the third fixing member is engaged with the tapered surface, and the third fixing member is fastened to the first fixing member by the fastening member.

Since the engaging portions of the pair of second fixing members are respectively engaged with the pair of engaging recesses of the fixing member receiving recess, the movement of the pair of second fixing members in the front-rear direction is restricted, and the third fixing is performed. When the member is fastened to the first fixing member by the fastening member in the front-rear direction, the pair of second fixing members and the pair of tapered portions of the third fixing member perform a wedge action between the pair of first fixing members. The two fixing members are pressed and integrated with the side portions of the fixing member receiving recesses, and the first fixing member is supported from the rear side by these second fixing members, and the support shaft end portion of the roller cutter is a bearing by the first fixing member. It is held in the recess. The excavation reaction force of the roller cutter is received by the cutter mounting member via the first fixing member and the pair of second fixing members. A pair of second fixing member, that is fastened to the first fixing member by a bolt member of a pair for loosening prevention.

  When replacing the roller cutter, first, the (bolt member) fastening member is loosened, and the third fixing member, the pair of second fixing members, and the first fixing member are sequentially moved from the fixing member receiving recess to the rear side. Remove. In this case, since the fixing member receiving recess is formed to be open rearward, the first to third fixing members can be removed rearward without interfering with the roller cutter, and the pair of second fixing members Since the pair of taper portions of the third fixing member are engaged with the taper surface that extends rearward, the third fixing member can be easily removed rearward from between the pair of second fixing members. Here, when it is not easy to remove the third fixing member due to the wedge action, by forming a screw hole in the third fixing member, the extraction member is screwed into the screw hole, and the third fixing member is It is possible to pull out using a pulling member. When the first to third fixing members are removed, the end of the support shaft of the roller cutter can be passed through the fixing member receiving recess, and the roller cutter can be moved rearward to be removed.

Next, the support shaft end of the new roller cutter is passed through the fixing member housing recess, the roller cutter is moved forward, and the support shaft end of the roller cutter is engaged with the bearing recess. Thereafter, the first fixing member is attached to the bearing recess side end of the fixing member receiving recess from the rear side in the reverse procedure to the above, and the pair of second fixing members are fixed to which the first fixing member is attached. The member receiving recess is mounted in a phase-separated manner from the rear side, and the engaging portions of the pair of second fixing members are engaged with the pair of engaging recesses, respectively, and the third fixing member is included in the fixing member receiving recess. A pair of second fixing members are mounted from the rear side. In this case, the third fixing member can be easily inserted between the pair of second fixing members by the tapered surface and the tapered portion. Then, the third fixing member is fastened to the first fixing member by a fastening member, then, first the bolt member and the second fixing member is fastened to the slack prevention, replacement of the roller cutter is completed.

A rotor cutter fixing device for a tunnel excavator according to a second aspect is the same as in the first aspect, wherein the cutter mounting member, the pair of square groove-shaped engaging recesses, the first fixing member, and the pair of second fixings. A pair of second fixing members, and a pair of taper surfaces extending rearward on opposite surfaces of the pair of second fixing members, and the third fixing member being engaged with the pair of tapered surfaces. A pair of tapered portions are formed, and a pulling member for pulling the third fixing member from the pair of second fixing members by screwing is engaged with the third fixing member, and the fastening member can be inserted. A screw hole having a diameter larger than that of the fastening member is formed. When exchanging the roller cutter, the third fixing member can be easily removed from between the pair of second fixing members to the rear side by screwing the pulling member into the screw hole of the third fixing member and pulling it. .
A rotor cutter fixing device for a tunnel excavator according to a third aspect is the same as in the first aspect, wherein the cutter mounting member, the pair of square groove-shaped engaging recesses, the first fixing member, and the pair of second fixings. A pair of second fixing members, and a pair of taper surfaces extending rearward on opposite surfaces of the pair of second fixing members, and the third fixing member being engaged with the pair of tapered surfaces. A pair of tapered portions to be joined is formed, and a pair of opposing surfaces of the bearing recess side end portions of the fixing member receiving recesses are formed as taper surfaces spreading backward, and the first fixing member has the 1 A pair of tapered portions that engage with the pair of tapered surfaces are formed. The first fixing member can be easily detached rearward from the fixing member housing recess, and can be integrated with the first fixing member mounted in the fixing member housing recess.
In the invention of claim 1 to 3, in a state where the shaft end portion is positioned with the lap of the engagement recess and a position of the hub of the roller cutter in the longitudinal direction it is engaged in the bearing recess of the roller cutter, The fixing member is configured to be attachable to and detachable from the fixing member receiving recess (Claim 4 ), and two sets of the cutter mounting member and the fixing member are provided in correspondence with a pair of support shaft end portions of the roller cutter. (Claim 6), a detachable saddle is provided at the front of the cutter mounting member, and the bearing recess is formed in the saddle (Claim 8), and a plurality of cemented carbide chips are attached to the front portion of the saddle ( You may employ | adopt the structure of Claim 9) .

  The roller cutter fixing device for a tunnel excavator according to claim 5 is a roller cutter fixing device for fixing a roller cutter mounted on the front surface of the cutter head of the tunnel excavator so as to be detachable from the rear side of the cutter head. A cutter mounting member that is fixed to the head and in which a bearing concave portion in which a support shaft end portion of the roller cutter can be engaged and disengaged from the rear side, and a fixing that is formed in the cutter mounting member and that is continuous with the rear end of the bearing concave portion. A pair of square groove-shaped engaging recesses formed in a phase-separating manner on opposite sides of the member receiving recess and the fixed member receiving recess, and a bearing recess side end of the fixing member receiving recess A first fixing member that is detachably mounted from the side and holds the shaft end of the roller cutter in the bearing recess, and a roller cutter in the fixing member receiving recess in which the first fixing member is mounted. A second fixing member that is detachably mounted from the first side and is fastened to the first fixing member by a fastening member to support the first fixing member from the rear side, and is engaged with a pair of engaging recesses so as not to move backward. A second fixing member having a pair of engaging portions to be joined, and in a state in which the support shaft end portion of the roller cutter is engaged with the bearing concave portion, the position of the hub of the roller cutter in the front-rear direction is It is located in front of the position of the engaging recess.

According to a fifth aspect of the present invention, two sets of the cutter mounting member and the fixing member are provided corresponding to the pair of spindle end portions of the roller cutter, respectively (invention 6). A pair of opposing surfaces of the bearing recess side end portions are formed in a taper surface spreading backward, and a pair of taper portions that engage with the pair of taper surfaces is formed in the first fixing member. 7) A detachable saddle is provided at the front portion of the cutter mounting member, and the bearing recess is formed in the saddle (Claim 8), and a plurality of cemented carbide chips are attached to the front portion of the saddle (Claim 9). ), Etc. may be adopted.

  According to the first aspect of the present invention, in a state where the tunnel can be excavated, the engaging portions of the pair of second fixing members are respectively engaged with the pair of engaging concave portions of the fixing member receiving concave portion. The movement of the second fixing member in the front-rear direction is restricted, and the third fixing member is fastened to the first fixing member by the fastening member in the front-rear direction, so that the tapered surface of the pair of second fixing members and the third fixing member are fixed. By wedge action with the pair of tapered portions of the member, the pair of second fixing members are pressed against the side portions of the fixing member receiving recesses to be surely integrated, and the first fixing member is moved to the rear side by these second fixing members. It is possible to reliably support the roller cutter, and to securely hold the roller cutter support shaft end portion in the bearing recess by the first fixing member, thereby fixing the roller cutter. And receiving with a cutter mounting member via a pair of second fixing members It can be.

When replacing the roller cutter, the fastening member is loosened, and the third fixing member, the pair of second fixing members, and the first fixing member are moved rearward from the fixing member receiving recess without interfering with the roller cutter. In this case, since the pair of taper portions of the third fixing member are engaged with the taper surfaces of the pair of second fixing members extending rearward, the second fixing member is inserted between the pair of second fixing members. 3 The fixing member can be easily removed to the rear side, and then the end of the support shaft of the roller cutter can be passed through the fixing member receiving recess, and the roller cutter can be moved to the rear side to be removed. Thereafter, the support shaft end portion of the new roller cutter is passed through the fixing member receiving recess, the roller cutter is moved to the front side, the support shaft end portion of the roller cutter is engaged with the bearing recess, and then the first fixing member. A pair of second fixing members and third fixing members can be sequentially attached to the fixing member receiving recesses from the rear side without interfering with the roller cutter. In this case, the third fixing member is 1 by the tapered surface and the tapered portion. It can be easily inserted between the pair of second fixing members. Then, the third fixing member is fastened to the first fixing member by the fastening member, and the roller cutter replacement operation is completed. As a result, the roller cutter replacement operation can be simplified and the replacement operation time can be significantly shortened. It is possible to shorten the tunnel excavation work period. Further, since the mechanism for rotating the rotor disk and the like and the mechanism for preventing the rotation are not required as in the prior art, the structure can be simplified.
In addition, a pair of bolt members that are inserted from the rear side into the bolt insertion holes of the pair of second fixing members and screwed to the first fixing member to fix the pair of second fixing members to the first fixing member are provided. The bolt insertion hole is formed with a diameter larger than that of the bolt member, and the third fixing member is fastened to the first fixing member by the fastening member while the first and second fixing members are mounted in the fixing member receiving recess, and the bolt The first and second fixing members are fastened by the members to prevent loosening. In other words, the third fixing member is fastened to the first fixing member by the fastening member, and the first and second fixing members are fastened by the bolt member, so that it can be securely held and slack can be prevented. In addition, when the third fixing member is fastened / unfastened to / from the first fixing member by the fastening member, the pair of second fixing members move somewhat toward and away from each other, but at this time, the pair of second fixing members is larger than the bolt member. By the bolt insertion hole formed in the diameter, the movement can be allowed and the state where the second fixing member is fixed to the first fixing member can be maintained.

According to the invention of claim 2, the cutter mounting member similar to that of claim 1, a pair of square groove-like engaging recesses, a first fixing member, a second fixing member, and a third fixing member. A pair of taper surfaces extending rearward are formed on opposing surfaces of the pair of second fixing members, and a pair of taper portions engaging with the pair of taper surfaces are formed on the third fixing member. Then, a pulling member for pulling the third fixing member from the pair of second fixing members to be screwed into the third fixing member, and a screw having a diameter larger than that of the fastening member so that the fastening member can be inserted therethrough. Since the hole is formed, when replacing the roller cutter, the pulling member is screwed into the screw hole of the third fixing member and pulled to pull the third fixing member from the pair of second fixing members to the rear side. Can be easily removed, and therefore the time for replacing the roller cutter can be shortened. It made. In addition, the same effects as those of the first aspect are obtained.

According to invention of Claim 3, the cutter attachment member similar to Claim 1, a pair of square groove-shaped engagement recessed part, a 1st fixing member, a 2nd fixing member, and a 3rd fixing member are included. A pair of taper surfaces extending rearward are formed on opposing surfaces of the pair of second fixing members, and a pair of taper portions engaging with the pair of taper surfaces are formed on the third fixing member. Then, a pair of opposed surfaces of the bearing recess side end portions of the fixing member receiving recesses are formed in a taper surface spreading backward, and the first fixing member is engaged with the pair of tapered surfaces 1 A pair of taper portions are formed. The first fixing member can be easily removed rearward from the fixing member receiving recess. In addition, the same effects as those of the first aspect are obtained.

According to a fourth aspect of the present invention, the fixed end of the roller cutter is engaged in a state in which the end of the support shaft of the roller cutter is engaged with the bearing recess and the position of the hub of the roller cutter and the position of the engagement recess are overlapped in the front-rear direction. When replacing the roller cutter configured to allow the member to be attached to and detached from the fixing member receiving recess, if the first to third fixing members are attached to or detached from the fixing member receiving recess from the roller cutter side, it interferes with the hub of the roller cutter. In the present plan, the first to third fixing members can be attached to and detached from the fixing member receiving concave portion from the rear side without interfering with the hub of the roller cutter .

  According to the fifth aspect of the present invention, in a state where the tunnel can be excavated, the pair of engaging portions of the second fixing member are engaged with the pair of engaging recesses of the fixing member receiving recess, respectively. The movement of the fixing member in the front-rear direction is restricted, and the second fixing member reliably supports the first fixing member from the rear side, and the first fixing member securely holds the shaft end of the roller cutter in the bearing recess. Thus, the roller cutter can be fixed, and the excavation reaction force of the roller cutter can be received by the cutter mounting member via the first fixing member and the second fixing member without acting on the fastening member.

  When replacing the roller cutter, the fastening member is loosened, and the second fixing member and the first fixing member are sequentially removed from the fixing member receiving recess. In this case, the end of the shaft of the roller cutter is engaged with the bearing recess. In the assembled state, the position of the hub of the roller cutter in the front-rear direction is positioned on the front side of the position of the engaging recess, so that the second fixing member can be attached to and detached from the fixing member receiving recess from the roller cutter side. After removing the first and second fixing members, the roller cutter can be replaced by passing the support shaft end portion of the roller cutter through the fixing member receiving recess. As a result, the roller cutter replacement work can be simplified, the replacement work time can be significantly shortened, and the tunnel excavation work period can be shortened. Further, the number of members can be reduced, and a mechanism for rotating the rotor disk and the like and a mechanism for preventing rotation can be eliminated as in the prior art, and the structure can be simplified.

  According to the sixth aspect of the present invention, since two sets of the cutter mounting member and the fixing member are provided in correspondence with the pair of spindle end portions of the roller cutter, the roller cutter can be securely fixed in a detachable manner.

  According to the seventh aspect of the present invention, the pair of opposing surfaces of the bearing recess side end portion of the fixing member receiving recess is formed in a taper surface spreading backward, and the pair of taper surfaces is formed on the first fixing member. Since the pair of tapered portions to be engaged is formed, the first fixing member can be easily removed from the fixing member receiving recess to the rear side, and the first fixing member is securely integrated with the fixing member receiving recess mounted. Can be expected.

  According to the eighth aspect of the present invention, since the detachable saddle is provided at the front portion of the cutter mounting member and the bearing recess is formed in the saddle, the saddle can be replaced when it is damaged due to wear or the like.

  According to the ninth aspect of the present invention, since a plurality of cemented carbide tips are attached to the front surface portion of the saddle, damage to the saddle due to excavated soil or the like can be prevented as much as possible.

  A roller cutter fixing device for a tunnel excavator according to the present invention fixes a roller cutter mounted on a front surface of a cutter head of a tunnel excavator so as to be detachable from the rear side of the cutter head. The roller cutter spindle end is configured to be detachable from the rear side of the recess, and a plurality of fixing members are detachably attached to the fixing member receiving recess connected to the rear end of the bearing recess of the cutter mounting member. The support shaft end is configured to be held in the housing recess.

  As shown in FIG. 1, the tunnel excavator 1 is equipped with a cutter head 2 rotatably supported by the body on the front side of the body (not shown), and a plurality of rollers are provided on the front surface of the cutter head 2. A cutter 3 is equipped. In this tunnel excavator 1, the cutter head 2 is driven forward by a plurality of propulsion jacks (not shown) together with the fuselage, and the cutter head 2 is rotated by a plurality of motors (not shown) to excavate a natural ground ahead. And drill the tunnel. The cutter head 2 is provided with a plurality of roller cutter fixing devices 4 that detachably fix the plurality of roller cutters 3 from the rear side of the cutter head 2.

The roller cutter fixing device 4 will be described.
As shown in FIGS. 2 to 7, each roller cutter fixing device 4 detachably fixes both end portions (a pair of support shaft end portions 3 a) of the rectangular support shaft of the roller cutter 3. Corresponding to the pair of spindle end portions 3a, the cutter mounting member 10, the first fixing member 20, the pair of second fixing members 25, the third fixing member 30, the fixing plate 35, and a pair of Two sets of bolt members 40 and fastening members 45 are provided.

  Here, the cutter head 2 includes, for example, a head central portion 2a, four spoke portions 2b extending radially from the head central portion 2a, and an outer peripheral annular portion 2c connected to the outer end portions of the four spoke portions 2b. The plurality of roller cutters 3 are attached to these 2a, 2b, and 2c substantially uniformly and with the support shafts directed in the radial direction (see FIG. 1). A portion of the cutter head 2 to which each roller cutter 3 is attached is provided with a pair of attachment plate portions 5 facing each other with a gap slightly larger than the diameter of the cutter ring 3b of the roller cutter 3, and these attachment plates. A roller cutter fixing device 4 is provided between the portions 5.

In each roller cutter fixing device 4, the pair of cutter attachment members 10 are spaced between the pair of attachment plate portions 5 so as to be orthogonal to the attachment plate portion 5 and slightly larger than the hub 3 c of the roller cutter 3. The pair of support shaft end portions 3a of the roller cutter 3 are detachably fixed to the cutter mounting members 10 respectively. Here, hereinafter, the direction in which the pair of cutter mounting members 10 face each other will be described as the roller axis direction, and the direction in which the pair of mounting plate portions 5 face each other will be described as the roller axis orthogonal direction (side).

  Each cutter mounting member 10 has a thickness in the roller axis direction that is approximately twice the length of the support shaft end portion 3a of the roller cutter 3, and is formed in a substantially rectangular shape when viewed from the roller axis direction. The roller cutter 3 is fixed to the inner side surface of the pair of mounting plate portions 5 by welding or the like, the front end bulges slightly forward from the mounting plate portion 5, and is fixed by the roller cutter fixing device 4 as a cutter mounting member. It will be in the state which protruded ahead rather than ten.

  Each cutter attachment member 10 has an attachment member main body 11 that occupies most of the cutter attachment member 10 and a saddle 15 that is detachably provided at the front of the attachment member main body 11 (cutter attachment member 10). A plurality of cemented carbide chips 16 are uniformly attached to the front surface portion of the saddle 15, and a support shaft end portion 3b of the roller cutter 3 can be engaged and disengaged from the rear side at the rear end portion of the saddle 15. A recess 17 is formed.

  A saddle receiving recess 12 is formed in the front portion of each mounting member body 11 in the thickness direction in the roller axis direction substantially the same as the length of the support shaft end 3a of the roller cutter 3 from the inner surface side. A fixing member receiving recess 13 which is continuous with the rear end and is open to the rear is formed, and a pair of square groove-like engaging recesses 14 are formed on the sides of the fixing member receiving recess 13 so as to be opposed to each other. Yes. A saddle 15 is detachably mounted in the saddle receiving recess 12, and a pair of bolts 18 are inserted into the mounting member body 11 from the rear side and screwed into the saddle 15, and the saddle 15 is attached to the mounting member body 11 by these bolts 18. It is fixed. With the saddle 15 mounted in the saddle receiving recess 12, the fixing member receiving recess 13 is connected to the rear end of the bearing recess 17 of the saddle 15.

  In the direction perpendicular to the roller axis, the length of the bearing recess side end (front end) of the fixed member receiving recess 13 is slightly less than half the length of the saddle receiving recess 12. The rear portions of the pair of engaging recesses 14 are openings 13 a having substantially the same length as the saddle receiving recess 12. Here, the position of the hub 3c of the roller cutter 3 in the front-rear direction in the state where the support shaft end portion 3a of the roller cutter 3 is engaged with the bearing recess portion 17 is the bearing recess side end portion of the fixing member housing recess portion 13. And the position of the engaging recess 14 are overlapped.

  The first fixing member 20 has substantially the same thickness in the roller axial direction as the fixing member receiving recess 13, and is detachably attached to the bearing recess side end of the fixing member receiving recess 13 from the rear side. The shaft end 3 a of the roller cutter 3 is held in the bearing recess 17 by abutting against the shaft end 3 a of the cutter 3 from the rear side. The length of the first fixing member 20 in the direction orthogonal to the roller axis is formed to be slightly smaller than the opening 13a. Therefore, the first fixing member 20 passes through the opening 13a at the bearing recess side end of the fixing member receiving recess 13. It can be removed from the rear side.

  A pair of opposing surfaces of the bearing recess side end portion of the fixing member receiving recess 13 is formed as a taper surface 13b spreading backward, and the first fixing member 20 is engaged with the pair of taper surfaces 13b. A pair of taper portions 20a is formed. The first fixing member 20 has a pair of screw holes 20b into which a pair of bolt members 40 are screwed at both ends in a direction perpendicular to the roller axis, and a screw hole 20c into which a fastening member 45 is screwed into a central portion. Is formed.

  The pair of second fixing members 25 have substantially the same thickness in the roller axial direction as the fixing member receiving recess 13 and are engaged with the pair of engaging recesses 14 so as not to move backward, respectively. It is provided with a portion 25a, and is detachably attached from the rear side to the fixing member receiving recess 13 to which the first fixing member 20 is mounted, and is separated from each other. And abuts against the first fixing member 20 from the rear side to support the first fixing member 20 from the rear side. The length of each second fixing member 25 in the direction perpendicular to the roller axis is formed to be smaller than the opening 13a, and the other second fixing member 25 is mounted in the state where one of the second fixing members 25 is mounted in the fixing member receiving recess 13. Can be attached and detached from the rear side through the opening 13a.

The third fixing member 30 has substantially the same thickness in the roller axial direction as the fixing member receiving recess 13 and is detachable from the rear side between the pair of second fixing members 25 in the fixing member receiving recess 13. Installed. A pair of tapered surfaces 25b of the rear spreading are formed in opposing surfaces of the second fixing member 25 of the pair, a pair of tapered portions 30a that engages the tapered surface 25 b of the pair to the third fixing member 30 Is formed. A pair of bolt insertion holes 25 c are formed in the pair of second fixing members 25, the bolt insertion holes 25 c are formed to have a larger diameter than the bolt member 40, and an insertion hole 30 b is formed in the third fixing member 30. The insertion hole 30b is formed with a larger diameter than the fastening member 45.

With the first and second fixing members 20 and 25 mounted in the fixing member receiving recess 13, the fastening member 45 is inserted from the rear side into the insertion hole 30 b of the third fixing member 30, and the screw of the first fixing member 20 The third fixing member 30 is fastened to the first fixing member 20 by being screwed into the hole 20c, and at this time, the first fixing member 20 and the pair of second fixing members 25 are tapered surfaces 25b. The taper portion 30a is pressed against the fixing member receiving recess 13 by the wedge action and is integrally fixed. In a state where the first and second fixing members 20 and 25 are fixed to the fixing member receiving recess 13, the pair of bolt members 40 are inserted from the rear side into the bolt insertion holes 25 c of the pair of second fixing members 25, The bolts 40 are screwed into the pair of screw holes 20b of the first fixing member 20, and the pair of second fixing members 25 are fixed to the first fixing member 20 to prevent loosening. Thereafter, the bolt 18 is tightened, and the saddle 15 is pulled rearward to finally fix the support shaft end portion 3a of the roller cutter 3.

  A pair of bolt holes 35a are formed in the fixing plate 35, and a pair of bolt members 40 are inserted into the bolt holes 35a. The fixing plate 35 is connected to the flanges of the pair of bolt members 40 and a pair of second fixings. It is fixed so as to be sandwiched between the members 25, and the rear ends of the pair of second fixing members 25 are connected to each other by the fixing plate 35. The fixing plate 35 may be omitted.

Next, operations and effects including a roller cutter replacement method by the roller cutter fixing device 4 will be described.
In a state where the tunnel can be excavated, the support shaft end portion 3 a of the roller cutter 3 is engaged with the bearing recess portion 17 of the cutter mounting member 10, and the first fixing member 20 is included in the fixing member receiving recess portion 13 of the cutter mounting member 10. The pair of second fixing members 25 are attached to the end portion of the bearing recess, and the pair of second fixing members 25 are attached to the fixing member receiving recess 13 in a phase-separated manner. Are engaged with a pair of square groove-like engaging recesses 14 formed in a phase-separating manner on opposite sides.

  Then, the third fixing member 30 is mounted between the pair of second fixing members 25 in the fixing member accommodating recess 13, and rearwardly spread formed on the opposing surfaces of the pair of second fixing members 25. A pair of tapered portions 25a formed on the third fixing member 30 are engaged with the pair of tapered surfaces 25b, and the third fixing member 30 is fastened to the first fixing member 20 by the fastening member 45, thereby preventing loosening. Therefore, a pair of second fixing members 25 are fixed to the first fixing member 20 by a pair of bolt members 40.

  Since the engaging portions 25a of the pair of second fixing members 25 are respectively engaged with the pair of engaging recesses 14 of the fixing member receiving recess 13, movement of the pair of second fixing members 25 in the front-rear direction is restricted. Then, the third fixing member 30 is fastened to the first fixing member 20 in the front-rear direction by the fastening member 45, so that the taper surface 25 b of the pair of second fixing members 25 and the pair of tapers of the third fixing member 30. The pair of second fixing members 25 are pressed against and integrated with the side portions of the fixing member receiving recess 13 by the wedge action with the portion 30a, and the first fixing member 20 is supported from the rear side by these second fixing members 25. The support shaft end 3 a of the roller cutter 3 is held in the bearing recess 17 by the first fixing member 20. The excavation reaction force of the roller cutter 3 is received by the cutter mounting member 10 via the first fixing member 20 and the pair of second fixing members 25, and does not act on the bolt member 40 and the fastening member 45.

  When the roller cutter 3 is replaced, the pair of bolt members 40 are loosened, the fastening member 45 is loosened, the third fixing member 30 is removed from the fixing member housing recess 13 to the rear side, and the pair of second members The fixing member 25 and the first fixing member 20 are sequentially removed from the fixing member housing recess 13 to the rear side. In this case, since the fixing member accommodating recess 13 is formed to be open rearward, the first to third fixing members 20, 25, 30 can be removed rearward without interfering with the roller cutter 3. Since the pair of taper portions 30a of the third fixing member 30 are engaged with the taper surfaces 25b of the pair of second fixing members 25 spreading backward, the third fixing member is interposed between the pair of second fixing members 25. 30 can be easily removed to the rear side.

  When removing the first to third fixing members 20, 25, 30 to the rear side, a pulling member (not shown) may be connected to the first to third fixing members 20, 25, 30 and the pulling member may be pulled. it can. In this case, the screw hole 20b or 20c formed in the first fixing member 20 and the large-diameter screw hole formed in the insertion hole 30b of the third fixing member 30 are used as screw holes into which the leading end portion of the extraction member is screwed. it can.

  As shown in FIG. 7, after removing the first to third fixing members 20, 25, 30, the front end portion of the rail 48 is connected to the rear end portion of the saddle of the cutter mounting member 10 with a bolt 49. And the bottom end of the bearing recess 17 are made to coincide with each other, the support shaft end portion 3a of the roller cutter 3 is supported by the rail 48 and slid, passed through the fixing member receiving recess 13, and the roller cutter 3 is moved backward. Can be moved to the side and removed.

Next, the support shaft end portion 3a of the new roller cutter 3 is supported by the rail 48 and slid, passed through the fixing member accommodating recess 13, the roller cutter 3 is moved forward, and the support shaft end of the roller cutter 3 is moved. The portion 3 a is engaged with the bearing recess 17. Thereafter, the first fixing member 20 is mounted on the bearing recess side end of the fixing member receiving recess 13 from the rear side in the reverse procedure to that described above, and the first fixing member 20 mounts the pair of second fixing members 25. The fixing member receiving recesses 13 are mounted in a phase-separated manner from the rear side, and the engaging portions 25a of the pair of second fixing members 25 are engaged with the pair of engaging recesses 14 , respectively.

  Next, the third fixing member 30 is mounted between the pair of second fixing members 25 in the fixing member receiving recess 13 from the rear side. In this case, the third fixing member 30 can be easily inserted between the pair of second fixing members 25 by the tapered surface 25b and the tapered portion 30a. Then, the third fixing member 30 is fastened to the first fixing member 20 by the fastening member 45, and the pair of second fixing members 25 is fixed to the first fixing member 20 by the pair of bolt members 40, and then the bolt 18. Is tightened to draw the saddle 15 to the rear side to finally fix the support shaft end 3a of the roller cutter 3, and the replacement operation of the roller cutter 3 is completed.

  In this way, the replacement work of the roller cutter 3 can be simplified, and the time for the replacement work can be shortened remarkably. Especially when excavating a very hard ground (hard rock portion), a long distance tunnel is continuously formed. Even when excavating, it is possible to shorten the tunnel excavation work period. Further, since the mechanism for rotating the rotor disk and the like and the mechanism for preventing the rotation are not required as in the prior art, the structure can be simplified.

  In addition, even when the support shaft end portion 3a of the roller cutter 3 is engaged with the bearing recess 17, the roller cutter 3 in the front-rear direction and the position of the hub 3c of the roller cutter 3 and the position of the engagement recess 14 are overlapped. When the first to third fixing members 20, 25, 30 are attached to or detached from the roller cutter side from the roller cutter side when replacing the roller 3, the interference with the hub 3c of the roller cutter 3 occurs. The first to third fixing members 20, 25, and 30 can be attached to and detached from the fixing member receiving recess 13 from the rear side without interfering with the hub 3c.

  A pair of bolts that are inserted from the rear side into the bolt insertion holes 25 c of the pair of second fixing members 25 and screwed into the first fixing member 20 to fix the pair of second fixing members 25 to the first fixing member 30. Since the member 40 is provided and the bolt insertion hole 25c is formed to have a diameter larger than that of the bolt member 40, the pair of second fixing members 25 can be securely held in the phase-separated state in the fixing member receiving recess 13 and mounted. Therefore, the third fixing member 30 can be easily inserted and attached between the second fixing members 25. The pair of second fixing members 25 slightly move in the direction of approaching / separating due to the fastening / fastening of the third fixing member 30 to / from the first fixing member 20 by the fastening member 45. The bolt insertion hole 25c formed with a diameter larger than that of the member 40 allows the movement to be maintained and the state where the second fixing member 25 is fixed to the first fixing member 20 can be maintained.

  A pair of opposing surfaces of the bearing recess side end portion of the fixing member receiving recess 13 is formed in a taper surface 13b that extends rearward, and a pair that engages the pair of taper surfaces 13b in the first fixing member 20. Since the taper portion 20a is formed, the first fixing member 20 can be easily removed to the rear side from the fixing member receiving recess 13, and the first fixing member 20 is securely integrated with the fixing member receiving recess 13 in the mounted state. Can be expected.

  Since a detachable saddle 15 is provided at the front portion of the cutter mounting member 10 and a bearing recess 17 is formed in the saddle 15, the saddle 15 can also be replaced when it is damaged due to wear or the like. Since a plurality of cemented carbide chips 16 are attached to the portion, it is possible to prevent damage to the saddle 15 due to excavated soil or the like as much as possible.

  The third fixing member 30 has a larger diameter than the fastening member 45 so that a pulling member for pulling the third fixing member 30 from the pair of second fixing members 25 is screwed and the fastening member 45 can be inserted. Since the screw hole 30b is formed in the insertion hole 30b, when the roller cutter 3 is exchanged, the pulling member is screwed into the screw hole of the third fixing member 30 and pulled, so that the third fixing member 30 is paired. It is possible to easily remove the second fixing member 25 from the rear side to the rear side. Therefore, it is possible to further reduce the time for replacing the roller cutter 3.

  As shown in FIGS. 8 and 9, the roller cutter fixing device 4 </ b> A according to the second embodiment is configured to detachably fix a pair of support shaft end portions 3 a of the roller cutter 3, and a pair of support shaft end portions. Corresponding to 3a, two sets of the cutter mounting member 50, the first fixing member 60, the second fixing member 65, and the fastening member 70 are provided.

  Each cutter attachment member 50 has an attachment member main body 51 and a saddle 55 detachably provided at a front portion of the attachment member main body 51 (cutter attachment member 50). The saddle 55 has a plurality of carbide tips 56. The saddle 55 is uniformly attached, and a bearing recess 57 is formed in the saddle 55. The saddle 55 and the bearing recess 57 are the same as those in the first embodiment. A saddle receiving recess 52 is formed in the front portion of the mounting member main body 51, a fixing member receiving recess 53 that is open to the rear is formed continuously to the rear end of the saddle receiving recess 52, and the saddle 55 is attached to and detached from the saddle receiving recess 52. The fixing member receiving recess 53 is connected to the rear end of the bearing recess 57 of the saddle 55 in this state.

  A pair of square groove-like engaging recesses 54 are formed on the sides of the fixing member housing recess 53 in a mutually opposing manner, and an opening 53a is formed on the rear side. The length in the direction perpendicular to the roller axis of the bearing recess side end portion of the fixing member receiving recess 53 is slightly less than about 1/3 of the saddle receiving recess 52. Here, with the support shaft end 3 a of the roller cutter 3 engaged with the bearing recess 57, the position of the hub 3 c of the roller cutter 3 in the front-rear direction is the position of the engagement recess 54 of the fixing member receiving recess 53. It is located in front of the position.

  The first fixing member 60 has substantially the same thickness in the roller axial direction as the fixing member receiving recess 53, and is detachably attached to the bearing recess side end of the fixing member receiving recess 53 from the rear side. The spindle end 3 a of the roller cutter 3 is held in the bearing recess 57 by coming into contact with the spindle end 3 a of the cutter 3 from the rear side. The length of the first fixing member 60 in the direction orthogonal to the roller axis is formed to be slightly smaller than the opening 53a. Therefore, the first fixing member 60 passes through the opening 63a at the bearing recess side end of the fixing member receiving recess 63. It can be removed from the rear side.

  A pair of opposing surfaces of the bearing recess side end portion of the fixing member receiving recess 53 is formed as a taper surface 53b that extends rearward, and the first fixing member 60 engages with the pair of taper surfaces 53b. A pair of taper portions 60a is formed. The first fixing member 60 is formed with a screw hole 60b in which the fastening member 70 is screwed into the central portion.

  The second fixing member 65 has substantially the same thickness in the roller axis direction as that of the fixing member accommodating recess 53, and the length of the second fixing member 65 in the direction perpendicular to the roller axis is larger than the opening 53a. The second fixing member 65 includes a pair of engaging portions 65a that are respectively engaged with the pair of engaging concave portions 54 so as not to move backward, and a roller is mounted on the fixing member receiving concave portion 53 to which the first fixing member 60 is mounted. The pair of engaging portions 65a engage with the pair of engaging recesses 64 and come into contact with the first fixing member 60 from the rear side, so that the first fixing member 60 is detachably mounted from the cutter 3 side. Then, the bolt 58 is tightened, and the saddle 55 is pulled to the rear side to finally fix the support shaft end portion 3a of the roller cutter 3.

  According to this roller cutter fixing device 4A, in a state where the tunnel can be excavated, the pair of engaging portions 65a of the second fixing member 65 are engaged with the pair of engaging recesses 54 of the fixing member accommodating recess 53, respectively. Therefore, the movement of the second fixing member 65 in the front-rear direction is restricted, the first fixing member 60 is reliably supported from the rear side by the second fixing member 65, and the roller cutter 3 is supported by the first fixing member 60. The shaft end 3a can be securely held in the bearing recess 57, and the roller cutter 3 can be fixed. The excavation reaction force of the roller cutter 3 is not applied to the fastening member 70, and the first fixing member 60 and the first 2 can be received by the cutter mounting member 50 via the fixing member 65.

  When the roller cutter 3 is replaced, the fastening member 70 is loosened, and the second fixing member 65 and the first fixing member 60 are sequentially removed from the fixing member receiving recess 53. In this case, the support shaft end of the roller cutter 3 is removed. With the portion 3a engaged with the bearing recess 57, the position of the hub 3c of the roller cutter 3 in the front-rear direction is located in front of the position of the engagement recess 54. 65 can be attached and detached from the roller cutter side.

  After removing the first and second fixing members 60, 65, the roller cutter 3 can be replaced by passing the support shaft end portion 3 a of the roller cutter 3 through the fixing member accommodating recess 53. As a result, the replacement work of the roller cutter 3 can be simplified, the time for the replacement work can be remarkably shortened, and the tunnel excavation work period can be shortened. In addition, the number of members can be reduced, and a mechanism for rotating the rotor disk and a mechanism for preventing the rotation are not required as in the prior art, so that the structure can be simplified. Other related actions and effects are the same as in the first embodiment.

  Note that the roller cutter fixing device of the present invention can be implemented by adding other various modifications in addition to the above-described matters without departing from the spirit of the present invention.

It is a front view of the cutter head of the tunnel excavator of Example 1. It is a front view of a roller cutter and a roller cutter fixing device. It is the II-II sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the disassembled state of a roller cutter fixing device. It is a perspective view of a roller cutter fixing device. It is a perspective view of the disassembled state of a roller cutter fixing device. It is a longitudinal cross-sectional view at the time of roller cutter replacement | exchange of a roller cutter fixing device. Example 2 It is a longitudinal cross-sectional view of a roller cutter fixing device. It is a longitudinal cross-sectional view of the disassembled state of a roller cutter fixing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel excavator 2 Cutter head 3 Roller cutter 3a Support shaft end part 3c Hub 4, 4A Roller cutter fixing device 10, 50 Cutter attachment member 13, 53 Fixing member accommodation recessed part 13b, 53b Tapered surface 14, 54 Engaging recessed part 15, 55 Saddle 16, 56 Carbide tip 17, 57 Bearing recess 20, 60 First fixing member 20a, 60a Tapered portion 20b, 20c, 60b Screw hole 25, 65 Second fixing member 25a, 65a Engaging portion 25b Tapered surface 25c Bolt Insertion hole 30 Third fixing member 30a Tapered portion 40 Bolt members 45, 70 Fastening member

Claims (9)

In the roller cutter fixing device for fixing the roller cutter mounted on the front part of the cutter head of the tunnel excavator detachably from the rear side of the cutter head,
A cutter mounting member that is fixed to the cutter head and in which a bearing concave portion in which a support shaft end portion of the roller cutter is detachable from the rear side is formed;
A pair of square grooves formed in the cutter mounting member and connected to the rear end of the bearing recess and open to the rear, and a pair of square grooves formed opposite to each other on the side of the fixed member storage recess. An engaging concave portion,
A first fixing member that is detachably mounted from the rear side on the bearing recess side end portion of the fixing member housing recess and holds the support shaft end portion of the roller cutter in the bearing recess;
A pair of second fixing members that are detachably attached to the fixing member receiving concave portion to which the first fixing member is attached and are spaced apart from each other to support the first fixing member from the rear side. A pair of second fixing members each including a pair of engaging portions that are respectively engaged with the pair of engaging recesses so as not to move backward;
A third fixing member that is detachably mounted from the rear side between the pair of second fixing members of the fixing member accommodating recess, and is fastened to the first fixing member by a fastening member;
A pair of taper surfaces extending rearward are formed on opposing surfaces of the pair of second fixing members, and a pair of taper portions engaging with the pair of taper surfaces are formed on the third fixing member. and,
A pair of bolt members that are inserted from the rear side into the bolt insertion holes of the pair of second fixing members and screwed into the first fixing member to fix the pair of second fixing members to the first fixing member; The bolt insertion hole is formed to have a diameter larger than that of the bolt member, and the third fixing member is fastened to the first fixing member by the fastening member while the first and second fixing members are attached to the fixing member receiving recess, and the bolt Configured to prevent loosening by fastening the first and second fixing members with the member,
A roller cutter fixing device for a tunnel excavator. In the roller cutter fixing device for fixing the roller cutter mounted on the front part of the cutter head of the tunnel excavator detachably from the rear side of the cutter head,
A cutter mounting member that is fixed to the cutter head and in which a bearing concave portion in which a support shaft end portion of the roller cutter is detachable from the rear side is formed;
A pair of square grooves formed in the cutter mounting member and connected to the rear end of the bearing recess and open to the rear, and a pair of square grooves formed opposite to each other on the side of the fixed member storage recess. An engaging concave portion,
A first fixing member that is detachably mounted from the rear side on the bearing recess side end portion of the fixing member housing recess and holds the support shaft end portion of the roller cutter in the bearing recess;
A pair of second fixing members that are detachably attached to the fixing member receiving concave portion to which the first fixing member is attached and are spaced apart from each other to support the first fixing member from the rear side. A pair of second fixing members each including a pair of engaging portions that are respectively engaged with the pair of engaging recesses so as not to move backward;
A third fixing member that is detachably mounted from the rear side between the pair of second fixing members of the fixing member accommodating recess, and is fastened to the first fixing member by a fastening member;
A pair of taper surfaces extending rearward are formed on opposing surfaces of the pair of second fixing members, and a pair of taper portions engaging with the pair of taper surfaces are formed on the third fixing member. And
A pulling member for pulling the third fixing member to pull out from between the pair of second fixing members is screwed into the third fixing member, and a screw hole having a diameter larger than that of the fastening member so that the fastening member can be inserted. Formed,
Roller cutter fixing device characteristics and to belt tunnel excavator that. In the roller cutter fixing device for fixing the roller cutter mounted on the front part of the cutter head of the tunnel excavator detachably from the rear side of the cutter head,
A cutter mounting member that is fixed to the cutter head and in which a bearing concave portion in which a support shaft end portion of the roller cutter is detachable from the rear side is formed;
A pair of square grooves formed in the cutter mounting member and connected to the rear end of the bearing recess and open to the rear, and a pair of square grooves formed opposite to each other on the side of the fixed member storage recess. An engaging concave portion,
A first fixing member that is detachably mounted from the rear side on the bearing recess side end portion of the fixing member housing recess and holds the support shaft end portion of the roller cutter in the bearing recess;
A pair of second fixing members that are detachably attached to the fixing member receiving concave portion to which the first fixing member is attached and are spaced apart from each other to support the first fixing member from the rear side. A pair of second fixing members each including a pair of engaging portions that are respectively engaged with the pair of engaging recesses so as not to move backward;
A third fixing member that is detachably mounted from the rear side between the pair of second fixing members of the fixing member accommodating recess, and is fastened to the first fixing member by a fastening member;
A pair of taper surfaces extending rearward are formed on opposing surfaces of the pair of second fixing members, and a pair of taper portions engaging with the pair of taper surfaces are formed on the third fixing member. And
A pair of opposing surfaces of the bearing recess side end portion of the fixing member receiving recess is formed as a taper surface that extends rearward, and a pair of the first fixing member that engages with the pair of taper surfaces. Formed a taper,
Roller cutter fixing device characteristics and to belt tunnel excavator that. With the shaft end of the roller cutter engaged with the bearing recess and the position of the hub of the roller cutter and the position of the engagement recess in the front-rear direction wrapped, the fixing member receiving recess of the fixing member tunneling machine of the roller cutter fixing device according to any one of claims 1 to 3, characterized in that configured to be able to detachable. In the roller cutter fixing device for fixing the roller cutter mounted on the front part of the cutter head of the tunnel excavator detachably from the rear side of the cutter head,
A cutter mounting member that is fixed to the cutter head and in which a bearing concave portion in which a support shaft end portion of the roller cutter is detachable from the rear side is formed;
A pair of square groove-like engagements formed on the cutter mounting member, which are formed in a spaced-apart manner on the side of the fixing member receiving recess and the fixing member receiving recess that are connected to the rear end of the bearing recess. A recess,
A first fixing member that is detachably mounted from the rear side on the bearing recess side end portion of the fixing member housing recess and holds the support shaft end portion of the roller cutter in the bearing recess;
The second fixing member is detachably mounted from the roller cutter side to the fixing member receiving recess in which the first fixing member is mounted, and is fastened to the first fixing member by the fastening member to support the first fixing member from the rear side. And a second fixing member provided with a pair of engaging portions respectively engaged with the pair of engaging recesses so as not to move backward,
With the support shaft end of the roller cutter engaged with the bearing recess, the position of the hub of the roller cutter in the front-rear direction is located on the front side of the position of the engagement recess .
Roller cutter fixing device characteristics and to belt tunnel excavator that.   The roller of the tunnel excavator according to any one of claims 1 to 5, wherein two sets of the cutter mounting member and the fixing member are provided so as to correspond to a pair of support shaft end portions of the roller cutter. Cutter fixing device. A pair of opposing surfaces of the bearing recess side end portion of the fixing member receiving recess is formed as a taper surface that extends rearward, and a pair of the first fixing member that engages with the pair of taper surfaces. 6. The roller cutter fixing device for a tunnel excavator according to claim 5 , wherein a tapered portion is formed.   The roller cutter fixing device for a tunnel excavator according to any one of claims 1 to 7, wherein a detachable saddle is provided at a front portion of the cutter mounting member, and the bearing recess is formed in the saddle.   The roller cutter fixing device for a tunnel excavator according to claim 8, wherein a plurality of cemented carbide tips are attached to a front portion of the saddle.

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