Conical cutterhead and tunnel boring machine

Abstract

The present invention discloses a conical cutter disc and a tunnel boring machine, comprising: at least one side tool holder, on which at least one side tool is installed; an axle seat, connected to the tunnel boring machine, on which the side tool holder is installed; wherein the tunnel boring machine can drive the conical cutter disc to tunnel in at least two directions respectively, and there is an angle between the blade of the side tool and the tunneling direction of the conical cutter disc, and the side tool holder can swing relative to the axis of the axle seat to adjust the angle of the angle. The conical cutter disc and tunnel boring machine of the present invention, when the tunnel boring machine drives the conical cutter disc to tunnel in any direction, can adjust the stress state of the blade of the side tool to a good stress state, thereby avoiding the problem of the blade of the side tool cracking due to poor stress state, thereby avoiding frequent replacement of side tools, reducing construction costs, and the blade of the side tool is excavated in a good pressure state, which can also improve the efficiency of tunneling.

Description

Technical Field

[0001] The invention relates to the technical field of engineering tunnel equipment, in particular to a conical cutter head and a tunnel boring machine. Background Art

[0002] At present, the roadheader is a comprehensive equipment that uses mechanical rock crushing, mucking and support to perform continuous operations. It is widely used in hydropower, railway and subway tunnel projects. The cantilever roadheader has a swing excavation function. There is an angle between the blade of the roller on the cone of the conical cutter disc and the excavation direction. If the angle is too large, it will affect the stress state of the blade and cause the blade to crack. At present, the cantilever roadheader can be divided into two excavation modes: forward excavation (i.e. excavation along the axial direction of the conical cutter disc) and lateral expansion excavation (i.e. excavation along the direction of the cantilever swing). Due to the fixed cone angle of the conical cutter disc, the roller on the cone cannot maintain a good stress state in both the forward excavation state and the lateral expansion state, causing the blade to crack.

[0003] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete description of the technical solutions and technical problems solved by the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present invention. Summary of the invention

[0004] The purpose of the present invention is to provide a conical cutter disc and a tunnel boring machine to solve the technical problem that the roller cutter on the current conical cutter disc cannot maintain a good stress state both in the forward excavation state and the lateral expansion state, resulting in blade cracking.

[0005] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] The present invention provides a conical cutter disc, comprising: at least one side tool holder, on which at least one side tool is installed; an axle seat, connected to a tunnel boring machine, and the side tool holder is installed on the axle seat; wherein the tunnel boring machine can drive the conical cutter disc to dig in at least two directions respectively, and there is an angle between the blade of the side tool and the digging direction of the conical cutter disc, and the side tool holder can swing relative to the axis of the axle seat to adjust the angle of the angle.

[0007] In an embodiment of the present invention, the conical cutter disc has a first excavation state and a second excavation state. The conical cutter disc excavates along its axial direction in the first excavation state, and the conical cutter disc excavates toward its side in the second excavation state.

[0008] In an embodiment of the present invention, a critical value is set for the angle according to the force law of the blade of the side cutter, and the angle does not exceed the critical value in both the first excavation state and the second excavation state.

[0009] In an embodiment of the present invention, the side tool holder is connected to the shaft seat via a telescopic member, and the telescopic member can extend or contract and drive the side tool holder to swing relative to the axis of the shaft seat.

[0010] In an embodiment of the present invention, a support member is provided on the shaft seat, and the side tool holder is hinged to the support member.

[0011] In an embodiment of the present invention, a slide groove is provided on the side tool holder, and the slide groove has a first stop end and a second stop end; the telescopic member has a fixed end and a telescopic end, the fixed end is fixedly connected to the shaft seat, and the telescopic end slides along the slide groove when the side tool holder is swinging; wherein, the telescopic end extends and abuts against the first stop end when the conical cutter disc is excavating in one direction, and the telescopic end contracts and abuts against the second stop end when the conical cutter disc is excavating in another direction.

[0012] In an embodiment of the present invention, the number of the side tool holders is at least two, and the at least two side tool holders are arranged at intervals along the circumference of the shaft seat.

[0013] In an embodiment of the present invention, an intermediate tool holder is further mounted on the shaft seat, at least one intermediate tool is mounted on the intermediate tool holder, and at least two of the side tool holders are symmetrically distributed relative to the intermediate tool holder.

[0014] In an embodiment of the present invention, the side cutters and the intermediate cutters are both roller cutters, and a plurality of roller cutters are arranged at intervals on the side cutter holder and the intermediate cutter holder.

[0015] The present invention also provides a roadheader, comprising the above-mentioned conical cutter disc.

[0016] The characteristics and advantages of the present invention are:

[0017] The conical cutter disc and tunnel boring machine of the present invention adjust the angle between the blade of the side cutter on the side cutter holder and the tunneling direction by swinging the side cutter holder relative to the axis of the shaft seat, thereby adjusting the stress state of the blade of the side cutter. Therefore, when the tunnel boring machine drives the conical cutter disc to tunnel in any direction, the stress state of the blade of the side cutter can be adjusted to a good stress state, thereby avoiding the problem of cracking of the blade of the side cutter due to poor stress state, thereby avoiding frequent replacement of side cutters, reducing construction costs, and the blade of the side cutter is excavated under a good pressure state, which can also improve the tunneling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic structural diagram of the conical cutter head of the present invention when excavating in one direction.

[0020] Figure 2 It is a schematic diagram of the structure of the conical cutter head of the present invention when excavating in another direction.

[0021] Figure 3 It is a schematic diagram of the conical cutter disc of the present invention in the first excavation state.

[0022] Figure 4 It is a schematic diagram of the conical cutter disc of the present invention in the second excavation state.

[0023] In the figure:

[0024] 1. Shaft seat; 11. Mounting end; 12. Connecting end; 2. Side tool holder; 21. Side tool beam; 22. Side tool holder; 3. Side tool; 31. Blade; 4. Slide groove; 41. First stop end; 42. Second stop end; 6. Support member; 7. Telescopic member; 71. Telescopic end; 72. Fixed end; 8. Pin shaft; 9. Intermediate tool holder; 10. Intermediate tool. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Implementation Method 1

[0027] like Figure 1 and Figure 2 As shown, the present invention provides a conical cutter disc, comprising: at least one side tool holder 2, on which at least one side tool 3 is installed; an axle seat 1, which is connected to a tunnel boring machine, and the side tool holder 2 is installed on the axle seat 1; wherein the tunnel boring machine can drive the conical cutter disc to dig in at least two directions respectively, and there is an angle θ between the blade 31 of the side tool 3 and the digging direction J of the conical cutter disc, and the side tool holder 2 can swing relative to the axis Z of the axle seat 1 to adjust the angle of the angle θ.

[0028] The conical cutter disc of the present invention adjusts the angle θ between the blade 31 of the side cutter 3 on the side cutter holder 2 and the excavation direction J by swinging the side cutter holder 2 relative to the axis Z of the shaft seat 1, thereby adjusting the stress state of the blade 31 of the side cutter 3. Therefore, when the tunnel boring machine drives the conical cutter disc to excavate in any direction, the stress state of the blade 31 of the side cutter 3 can be adjusted to a good stress state, thereby avoiding the problem of cracking of the blade 31 of the side cutter 3 due to poor stress state, thereby avoiding frequent replacement of the side cutter 3, reducing construction costs, and improving construction efficiency. In addition, the blade 31 of the side cutter 3 is excavated under a good pressure state, which can also improve the excavation efficiency.

[0029] Specifically, the shaft seat 1 has a connection end 12 and a mounting end 11. The connection end 12 is connected to the tunneling machine. When the shaft seat 1 moves along the tunneling direction J driven by the tunneling machine, it will also rotate around its own axis and drive the side cutter holder 2 to rotate synchronously, thereby realizing tunneling. The side cutter holder 2 is mounted on the mounting end 11 of the shaft seat 1 and is located around the mounting end 11, so that the side cutter holder 2 constitutes a part of the conical working surface of the conical cutter disc. The angle θ between the blade 31 of the side cutter 3 and the tunneling direction J, that is, the angle between the direction A of the blade 31 and the tunneling direction J. The tunneling direction J described in the present invention includes but is not limited to the direction during linear motion and the tangent direction during curved motion. The side cutter holder 2 swings relative to the axis Z of the shaft seat 1, so that the side cutter holder 2 shrinks inward or expands outward, that is, the taper of the conical cutter disc is changed, so that the angle of the angle θ is also changed. The smaller the angle θ, the better the stress state of the blade 31 of the side cutter 3, and the higher the tunneling efficiency.

[0030] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the conical cutter disc has a first excavation state and a second excavation state. The conical cutter disc excavates along its axial direction J1 in the first excavation state, and excavates toward its side (i.e., direction J2) in the second excavation state. During construction, the conical cutter disc excavates in the first excavation state to make the excavation surface reach a certain depth, and then the conical cutter disc excavates in the second excavation state to expand the excavation surface to the required area, and the cycle is repeated until the construction is completed.

[0031] Specifically, the excavation direction J1 of the conical cutter disc in the first excavation state is the axial direction of the conical cutter disc, that is, the depth direction of the excavation surface. The tunnel boring machine has a cantilever, and the conical cutter disc is connected to the cantilever through the shaft seat 1. The cantilever drives the conical cutter disc to swing relative to the depth direction of the excavation surface, that is, the conical cutter disc reciprocates in an arc direction S, so that the conical cutter disc excavates toward its side. It can be seen that in the second excavation state, the side tool holder 2 can not only excavate with the shaft seat 1 as the cantilever swings, but also adjust the angle θ2 relative to the shaft seat 1. The conical cutter disc moves in a curve in the second excavation state. Therefore, the excavation direction J2 of the conical cutter disc in the second excavation state is the tangent direction of the cantilever swing, that is, the width direction of the excavation surface.

[0032] The angle θ is set to a critical value according to the force law of the blade 31 of the side cutter 3, and the angle θ does not exceed the critical value in the first excavation state and the second excavation state. Among them, the cracking of the blade 31 of the side cutter 3 is closely related to the force law of the blade 31 of the side cutter 3, and the force law of the blade 31 of the side cutter 3 is not only related to the excavation direction J, but also related to the structure, material, cutting speed and other factors of the blade 31 of the side cutter 3. Therefore, by setting a critical value according to the force law of the blade 31 of the side cutter 3, and then adjusting the angle θ according to the critical value, the cracking of the blade 31 of the side cutter 3 is effectively avoided. In this embodiment, the angle θ1 in the first excavation state and the angle θ2 in the second excavation state do not exceed 30 degrees. The blade 31 of the side cutter 3 maintains a good force state in both the first excavation state and the second excavation state. Specifically, the side cutter holder 2 expands outward as much as possible relative to the axis Z of the shaft seat 1 in the first excavation state (the radial dimension of the whole conical cutter disc increases), that is, the side cutter holder 2 swings toward its outer side (that is, the side close to the excavation surface and away from the axis Z), so that the taper of the conical cutter disc increases, and the angle θ1 between the blade 31 of the side cutter 3 and the excavation direction J1 is reduced as much as possible. The side cutter holder 2 shrinks inward as much as possible relative to the axis Z of the shaft seat 1 in the second excavation state (the radial dimension of the whole conical cutter disc decreases), that is, the side cutter holder 2 swings toward its inner side (that is, the side far away from the excavation surface and close to the axis Z), so that the taper of the conical cutter disc decreases, and the angle θ2 between the blade 31 of the side cutter 3 and the tangent direction J2 of the curved motion is reduced as much as possible. In the present invention, the critical value is not specifically limited. If the blade 31 of the side cutter 3 can still maintain a good stress state when the angle θ is other angles, such as 31 degrees, 32 degrees, 33 degrees, etc., which are greater than 30 degrees, the critical value can also be set to an angle greater than 30 degrees; if the blade 31 of the side cutter 3 cannot maintain a good stress state when the angle θ is 30 degrees, the critical value can also be set to an angle less than 30 degrees.

[0033] like Figure 1 and Figure 2 As shown, in the embodiment of the present invention, the side tool holder 2 is connected to the shaft seat 1 through a telescopic member 7, and the telescopic member 7 can extend or contract and drive the side tool holder 2 to swing relative to the axis Z of the shaft seat 1. The side tool holder 2 is driven to swing by the telescopic member 7, so as to adjust the angle between the blade 31 of the side cutter 3 and the excavation direction J. Specifically, the telescopic member 7 is generally a rod-shaped structure. The telescopic member 7 is a telescopic cylinder. Optionally, the telescopic member is an electric telescopic rod.

[0034] like Figure 1 and Figure 2 As shown, a support member 6 is provided on the shaft seat 1, and the side tool holder 2 is hinged to the support member 6 through a pin shaft 8. When the conical cutter head needs to switch the excavation direction J, the telescopic member 7 is extended or contracted to make the side tool holder 2 rotate around the pin shaft 8, thereby adjusting the angle θ. The side tool holder 2 is supported by the support member 6 to make the structure of the side tool holder 2 more stable. Optionally, the side tool holder is hinged to the support member through other connecting members so that the side tool holder can rotate around an axis.

[0035] Specifically, the support member 6 is generally a plate-like structure. The relative position between the support member 6 and the telescopic member 7 is not specifically limited, and they only need to be staggered in the axial direction of the side tool holder 2 (i.e., in the direction of the generatrix of the conical cutter disc). In order for the telescopic member 7 to better drive the side tool holder 2 to rotate around the pin 8, and there is space between the side tool holder 2 and the shaft seat 1 for installing the telescopic member 7, the telescopic member 7 is arranged at a position close to the rear end of the side tool holder 2 (i.e., the end with a larger radial dimension on the conical cutter disc). In this embodiment, the pin 8 is arranged along the tangential direction of the shaft seat 1. Optionally, the pin is arranged along the radial direction of the shaft seat. Optionally, the side tool holder is directly hinged to the shaft seat via a pin. The arrangement of the pin 8 in the present invention includes but is not limited to the above-mentioned method, which can realize the swing of the side tool holder 2 relative to the axis Z of the shaft seat 1.

[0036] like Figure 1 and Figure 2As shown, in an embodiment of the present invention, a slide groove 4 is provided on the side tool holder 2, and the slide groove 4 has a first stop end 41 and a second stop end 42; the telescopic member 7 has a fixed end 72 and a telescopic end 71, the fixed end 72 is fixedly connected to the shaft seat 1, and the telescopic end 71 slides along the slide groove 4 when the side tool holder 2 is swinging (that is, when rotating around the pin shaft 8); wherein the telescopic end 71 extends and abuts against the first stop end 41 when the conical cutter disc is excavating in one direction, and the telescopic end 71 contracts and abuts against the second stop end 42 when the conical cutter disc is excavating in another direction. By fixedly connecting the fixed end 72 of the telescopic member 7 with the shaft seat 1 and providing a slide groove 4 on the side tool holder 2, the structure of the side tool holder 2 is made more stable, that is, the side tool holder 2 will not shake when the telescopic member 7 is not extended or retracted, and the first stop end 41 and the second stop end 42 of the slide groove 4 can be used to position and limit the side tool holder 2 in the two excavation states respectively, without providing other positioning members and limiting members, and the structure is simple and easy to control.

[0037] Specifically, the side tool holder 2 includes two side tool beams 21 and at least one side tool seat 22, the two ends of the side tool seat 22 are connected to the two side tool beams 21, and the side tool 3 is installed on the side tool seat 22. The side tool beam 21 is provided with a pin shaft hole for passing the pin shaft 8 and a slide groove 4 for connecting with the telescopic member 7. The slide groove 4 is a waist-shaped through groove. The telescopic end 71 of the telescopic member 7 is provided with a cylindrical shaft, and the cylindrical shaft cooperates with the semicircular arc surfaces at both ends of the waist-shaped through groove. The semicircular arc surfaces at both ends of the waist-shaped through groove constitute the first stop end 41 and the second stop end 42 respectively. The length and layout position of the slide groove 4 are not specifically limited, and are designed according to the swing angle required when the side tool holder 2 switches states, and ensure that there is an angle between the length direction of the slide groove 4 and the telescopic direction of the telescopic member 7, so that the telescopic member 7 can apply pulling force and thrust to the side tool holder 2. In this embodiment, in order for the telescopic member 7 to better apply thrust and pull to the side tool holder 2, when the side tool holder 2 is swung into place, the angle between the length direction of the slide groove 4 and the telescopic direction of the telescopic member 7 is close to 90 degrees. Therefore, under the thrust of the telescopic member 7, the telescopic member 7 abuts against the first stop end 41, and the side tool holder 2 can also swing under the pulling force of the telescopic member 7, and under the pulling force of the telescopic member 7, the telescopic member 7 abuts against the second stop end 42, and the side tool holder 2 can also swing under the thrust of the telescopic member 7.

[0038] Combination Figure 3 As shown, when the conical cutter disc needs to be converted to the first excavation state, the telescopic member 7 extends and pushes the side cutter holder 2 to rotate around the pin shaft 8, so that the taper of the conical cutter disc becomes larger, and the angle θ1 between the blade 31 of the side cutter 3 and the axial direction of the shaft seat 1 (i.e., the excavation direction J1) becomes smaller, until the telescopic end 71 of the telescopic member 7 slides along the slide groove 4 to abut against the first stop end 41, the side cutter holder 2 stops rotating and the angle θ1 is adjusted to the right position. Figure 4As shown, when the conical cutter disc needs to be converted to the second excavation state, the telescopic member 7 contracts and pulls the side tool holder 2 to rotate around the pin shaft 8, so that the taper of the conical cutter disc becomes smaller, and the angle θ2 between the blade 31 of the side cutter 3 and the tangent direction (i.e., the excavation direction J2) when the cantilever swings becomes smaller, until the telescopic end 71 of the telescopic member 7 slides along the slide groove 4 to abut against the second stop end 42, the side tool holder 2 stops rotating and the angle θ2 is adjusted to the right position. Optionally, the fixed end of the telescopic member is hinged on the shaft seat, and the telescopic end of the telescopic member is hinged to the side tool holder. Optionally, the side tool holder can be installed on the shaft seat through other connecting rod structures.

[0039] like Figure 1 and Figure 2 As shown, in the embodiment of the present invention, the number of the side tool holders 2 is at least two, and at least two side tool holders 2 are arranged at intervals along the circumference of the shaft seat 1. The shaft seat 1 drives the side cutters 3 on at least two side tool holders 2 to perform excavation under the drive of the tunnel boring machine. Specifically, each side tool holder 2 has the same structure and is installed on the shaft seat 1 through at least one telescopic member 7 and at least one support member 6, and each side tool holder 2 is hinged to the support member 6 through a pin shaft 8. The number of side tool holders 2 is not specifically limited, and can be designed according to the size of the conical cutter disc.

[0040] like Figure 1 and Figure 2 As shown, an intermediate tool holder 9 is also installed on the shaft seat 1, and at least one intermediate tool 10 is installed on the intermediate tool holder 9. At least two side tool holders 2 are symmetrically distributed relative to the intermediate tool holder 9. Figure 3 As shown, in the first excavation state, the middle cutter 10 on the middle cutter holder 9 and the side cutter 3 on the side cutter holder 2 work together to improve the excavation efficiency. Figure 4 As shown, in the second excavation state, only the side cutter 3 on the side cutter holder 2 performs excavation.

[0041] Specifically, the intermediate tool holder 9 includes two intermediate tool beams and at least one intermediate tool seat, the two intermediate tool beams are connected to the two ends of the intermediate tool seat, and the intermediate tool 10 is installed on the intermediate tool seat. The intermediate tool beam is welded and fixed to the shaft seat 1. The intermediate tool holder 9 constitutes the cone top working surface of the conical cutter disc. The intermediate tool holder 9 is fixedly set on the shaft seat 1, and the direction of the blade of the intermediate tool 10 is basically parallel to the axis Z of the shaft seat 1. It can be seen that in the first excavation state, the angle between the blade of the intermediate tool 10 and the excavation direction J1 is very small, so that the intermediate tool 10 maintains a good stress state, while in the second excavation state, the blade of the intermediate tool 10 does not participate in the excavation work. Therefore, the intermediate tool holder 9 can be fixedly set without adjusting the angle between the blade of the intermediate tool 10 and the excavation direction J2.

[0042] like Figure 1 and Figure 2As shown, the side cutters 3 and the intermediate cutters 10 are both roller cutters, and a plurality of roller cutters are arranged at intervals on the side cutter holder 2 and the intermediate cutter holder 9. Rock is broken by the continuous rolling of the roller cutters. Optionally, pick-tooth-type cutters or other types of cutters may also be installed on the side cutter holder 2 and the intermediate cutter holder 9. Specifically, the number and arrangement spacing of the side cutters 3 and the intermediate cutters 10 are not specifically limited, and they can be arranged according to geological conditions. Since the spacing between the blade trajectories of multiple side cutters 3 and multiple intermediate cutters 10 directly determines the efficiency of excavation, each side cutter holder 2 is consistent in relative position with the corresponding telescopic member 7, support member 6, pin shaft 8 and shaft seat 1, ensuring that when the conical cutter disc switches the excavation state, the swing angles of each side cutter holder 2 are the same, thereby ensuring that the spacing between the blade trajectories of the side cutters 3 on different side cutter holders 2 is always consistent.

[0043] Implementation Method 2

[0044] The present invention further provides a roadheader, comprising a conical cutter disc. The structure, working principle and beneficial effects of the conical cutter disc are the same as those of the conical cutter disc in the first embodiment, and will not be described in detail here. The structure, working principle and beneficial effects of the roadheader in this embodiment are the same as those of the roadheader in the first embodiment, and will not be described in detail here.

[0045] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A conical cutter disc, characterized in that: include: At least one side of the tool holder is equipped with at least one side of the tool; An axle seat connected to the tunnel boring machine, and the side tool holder is mounted on the axle seat; The tunneling machine can drive the conical cutter disc to tunnel in at least two directions respectively, an angle is formed between the blade of the side cutter and the tunneling direction of the conical cutter disc, and the side cutter holder can swing relative to the axis of the shaft seat to adjust the angle of the angle; The side tool holder is connected to the shaft seat via a telescopic member, and the telescopic member can extend or contract and drive the side tool holder to swing relative to the axis of the shaft seat; A support member is provided on the shaft seat, and the side tool holder is hinged to the support member; The side tool holder is provided with a slide groove, and the slide groove has a first stop end and a second stop end; The telescopic member has a fixed end and a telescopic end, the fixed end is fixedly connected to the shaft seat, and the telescopic end slides along the slide groove when the side tool holder is swinging; The telescopic end extends and abuts against the first stop end when the conical cutter disc is excavating in one direction, and the telescopic end contracts and abuts against the second stop end when the conical cutter disc is excavating in another direction.

2. The conical cutter disc according to claim 1, characterized in that: The conical cutter disc has a first excavation state and a second excavation state. The conical cutter disc excavates along its axial direction in the first excavation state, and the conical cutter disc excavates toward its side in the second excavation state.

3. The conical cutter disc according to claim 2, characterized in that: A critical value is set for the angle according to the force law of the blade of the side cutter, and the angle does not exceed the critical value in both the first excavation state and the second excavation state.

4. The conical cutter disc according to claim 1, characterized in that: The number of the side tool holders is at least two, and at least two of the side tool holders are arranged at intervals along the circumference of the shaft seat.

5. The conical cutter disc according to claim 4, characterized in that: An intermediate tool holder is also installed on the shaft seat, and at least one intermediate tool is installed on the intermediate tool holder. At least two side tool holders are symmetrically distributed relative to the intermediate tool holder.

6. The conical cutter disc according to claim 5, characterized in that: The side cutters and the middle cutters are both rolling cutters, and a plurality of the rolling cutters are arranged at intervals on the side cutter holder and the middle cutter holder.

7. A tunnel boring machine, characterized in that: The conical cutter disc comprises the conical cutter disc as claimed in any one of claims 1 to 6.

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