Cutting wheels for tunnel boring machines

Abstract

To present a cutting wheel for a tunnel boring machine, which is distinguished by a tool condition monitoring device that is reliable, easily adaptable and can be relatively easily retrofitted in existing configurations. In a cutting wheel (103) for a tunnel boring machine, a tool condition monitoring device is provided for monitoring the state of at least one drilling tool (112, 115, 118) when cutting away the ground adjacent to the cutting wheel (103) in the direction of excavation during excavation, the tool condition monitoring device having at least one support member (121, 124, 127) mounted separately at a distance from the corresponding drilling tool (112, 115, 118). A current conductor element is embedded in the corresponding support member (121, 124, 127), the current guidance of which is interrupted in its suitability for current guidance after reaching a wear limit value characteristic for the state of the corresponding drilling tool (112, 115, 118). As a result, the state of the drilling tool (112, 115, 118) can be reliably determined during relatively simple maintenance or retrofitting with the support member (121, 124, 127).

Description

[Technical Field]

[0001] The present invention is as defined in claim 1 and claim 2 The present invention relates to a cutting wheel for a tunnel boring machine as described in the generic concept of the above. [Background technology]

[0002] A cutting wheel of this type is known from CN 108 776 074 A. This known cutting wheel of the type has a number of drilling tools for cutting away the earth adjacent to the cutting wheel in the direction of drilling during drilling, and is equipped with a tool condition monitoring device for monitoring the wear state of the drilling tools. The tool condition monitoring device in this cutting wheel has a number of resistance wear sensors integrated into the drilling tools.

[0003] DE 35 35 474 A1 discloses a device for detecting limit wear and / or cutting edge breakage in a tool, in which two conductor paths are integrated into the tool, one of which is part of a closed circuit, while the other is part of an open circuit. If, at a predetermined wear limit of the tool, the conductor path located in the closed circuit is interrupted or the open circuit is closed by forming a conductive connection between both conductor paths, a signal is generated, which causes the work process to be interrupted. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Patent Application Publication No. 108776074 [Patent Document 2] German Patent Application Publication No. 3535474 [Patent Document 3] U.S. Patent Application Publication No. 2011 / 0031017 [Patent Document 4] Patent Publication No. 2000-204884 Summary of the Invention [Problem to be solved by the invention]

[0005] The object underlying the present invention is to provide a cutting wheel of the type mentioned at the outset which is distinguished by a tool condition monitoring device that is reliable, easily adaptable and can be retrofitted relatively easily in existing designs. [Means for solving the problem]

[0006] This object is achieved according to the invention by a cutting wheel of the type mentioned at the outset, which has the features of claim 1 or claim 2. That is, according to the first aspect of the present invention, A cutting wheel for a tunnel boring machine, comprising: a predetermined number of excavation tools for cutting away geology adjacent to the cutting wheel in the direction of excavation during excavation; and a tool condition monitoring device for monitoring the wear state of the excavation tools, the tool condition monitoring device has at least one support member assigned to one drilling tool and / or one group of drilling tools, the support member being spatially separated from the one or more drilling tools or the one or more group of drilling tools and removably connected to a frame structure; At least one conductive current conductor element is embedded within the or each support member; the current conductor element is embedded in such a way that it can be interrupted after a wear of the support element that is characteristic for a predetermined wear state of the drilling tool and / or group of drilling tools, the at least one support member is configured as an intermediate member, the intermediate member being arranged between a drilling tool and / or a group of drilling tools and the frame structure; the intermediate element follows a geometrically similar contour of the front surface of the corresponding drilling tool or group of drilling tools located forward in the direction of drilling, the front surface of the intermediate element located forward in the direction of drilling being offset backward in the opposite direction of the direction of drilling relative to the contour of the front surface of the corresponding drilling tool and / or group of drilling tools; and the intermediate member has a cable receiving recess at a predetermined distance from its front face, the cable receiving recess extending in the direction of tunneling behind the outer material wall of the intermediate member, the current conductor element being arranged in the cable receiving recess; A cutting wheel is provided, characterized by: More specifically, in the first aspect, A cutting wheel for a tunnel boring machine, comprising: a predetermined number of excavation tools for cutting away geology adjacent to the cutting wheel in the direction of excavation during excavation; and a tool condition monitoring device for monitoring the wear state of the excavation tools, the tool condition monitoring device has at least one support member assigned to one drilling tool and / or one group of drilling tools, the support member being spatially separated from the one drilling tool or one group of drilling tools and removably connected to a frame structure; At least one conductive current conductor element is embedded within the support member; - the current conductor element is embedded in such a way that it can be interrupted after a wear of the support member that is characteristic for a predetermined wear state of a drilling tool and / or a group of drilling tools; the support member is configured as an intermediate member, the intermediate member being arranged between one drilling tool and / or one group of drilling tools and the frame structure; the intermediate element follows a geometrically similar contour of the front surface of the drilling tool or group of drilling tools located forward in the direction of drilling, the front surface of the intermediate element located forward in the direction of drilling being offset backward in the opposite direction of the direction of drilling relative to the contour of the front surface of each of the drilling tools and / or group of drilling tools located forward in the direction of drilling; the intermediate member has a cable receiving recess at a predetermined distance from the front side of the intermediate member, the cable receiving recess extending behind the outer material wall of the intermediate member in the direction of tunneling, and the current conductor element being arranged in the cable receiving recess; It is characterized by: Furthermore, according to a second aspect of the present invention, A cutting wheel for a tunnel boring machine, comprising: a predetermined number of excavation tools for cutting away geology adjacent to the cutting wheel in the direction of excavation during excavation; and a tool condition monitoring device for monitoring the wear state of the excavation tools, the tool condition monitoring device has at least one support member assigned to one drilling tool and / or one group of drilling tools, the support member being spatially separated from the one or more drilling tools or the one or more group of drilling tools and removably connected to a frame structure; At least one conductive current conductor element is embedded within the or each support member; the current conductor element is embedded in such a way that it can be interrupted after a wear of the support element that is characteristic for a predetermined wear state of the drilling tool and / or group of drilling tools; and the at least one support member is configured as an elongated support bolt, the support bolt being arranged at a predetermined lateral distance from at least one drilling tool; A cutting wheel is provided, characterized by: More specifically, in the second aspect, A cutting wheel for a tunnel boring machine, comprising: a predetermined number of excavation tools for cutting away geology adjacent to the cutting wheel in the direction of excavation during excavation; and a tool condition monitoring device for monitoring the wear state of the excavation tools, the tool condition monitoring device has at least one support member assigned to one drilling tool and / or one group of drilling tools, the support member being spatially separated from the one drilling tool or one group of drilling tools and removably connected to a frame structure; At least one conductive current conductor element is embedded within the support member; the current conductor element is embedded in such a way that it can be interrupted after wear of the support member that is characteristic for a predetermined wear state of a drilling tool and / or a group of drilling tools; and the support member is configured as a support bolt, the support bolt being arranged at a predetermined lateral distance from at least one drilling tool; It is characterized by: It should be noted that the reference numerals used in the claims of this application are intended solely to facilitate understanding of the present invention and are not intended to limit the present invention to the illustrated forms. DETAILED DESCRIPTION OF THE INVENTION

[0007] The present invention can have the following configurations. (Form 1) A cutting wheel for a tunnel boring machine, comprising: a predetermined number of excavation tools for cutting away geology adjacent to the cutting wheel in the direction of excavation during excavation; and a tool condition monitoring device for monitoring the wear state of the excavation tools, the tool condition monitoring device has at least one support member assigned to one drilling tool and / or one group of drilling tools, the support member being spatially separated from the one or more drilling tools or the one or more group of drilling tools and removably connected to a frame structure; and at least one electrically conductive current conductor element is embedded in the or each support element such that the or each current conductor element can be interrupted after a wear of the or each support element that is characteristic for a predetermined wear state of the or each drilling tool and / or group of drilling tools. (Form 2) The current conductor element is preferably arranged at a predetermined distance from the front face of the or one of the support members located forward in the excavation direction. (Form 3) Preferably, the or one current conductor element is an insulated current conductor cable. (Form 4) Preferably, the or one support member is configured as an intermediate member, which is arranged between a drilling tool and / or a group of drilling tools and the frame structure. (Form 5) It is preferable that the intermediate member follows the contour of the front surface of the corresponding drilling tool or drilling tool of the corresponding group located forward in the drilling direction, and that the front surface of the intermediate member located forward in the drilling direction is shifted backward in the opposite direction to the drilling direction relative to the contour of the front surface of the corresponding drilling tool and / or drilling tool of the group. (Form 6) Preferably, the intermediate member has a cable receiving recess spaced a predetermined distance from the front surface, and the current conductor element is disposed within the cable receiving recess. (Form 7) Preferably, the or one support element is configured as an elongated support bolt, the support bolt being arranged at a predetermined lateral distance from the at least one drilling tool. (Form 8) It is preferable that the front part of the support bolt, which is located forward in the excavation direction, is offset backward in the opposite direction to the excavation direction relative to the front part of the drilling tool adjacent to the support bolt, which is also located forward in the excavation direction. (Form 9) Preferably, the support bolt has a blind hole recess extending in the longitudinal direction, and the current conductor element is arranged in the blind hole recess. (Form 10) Preferably, the current conductor element terminates at a predetermined distance from the front face of the support bolt. (Form 11) Preferably, the support member is connected to a line guide device of the tool state monitoring device, and the line guide device is removably connected to the frame structure. (Form 12) Preferably, the line guidance device is encapsulated against external mechanical influences. (Form 13) The line guide device is preferably connected to the connection housing on the side opposite the support member. (Form 14) The or each current conductor element is preferably connected to a data transmission unit via a guide cable and a cable plug-in connection.

[0008] According to the present invention, in a tool condition monitoring device, a support element separate from the drilling tool or tools to be monitored is provided, and a conductive current conductor element is embedded in the support element, so that, by suitable arrangement of the support element, the wear state of the drilling tools can be monitored by means of the wear of the support element, which correlates with the wear of the drilling tool or tools, and the configuration of the support element allows for simple adaptation to the respective mounting situation and the wear characteristics of a tool or a group of tools.In addition, as a component separate from the tool or group of tools, the support element can be relatively easily retrofitted to existing structures without essentially having to modify the drilling tools.

[0009] Further expedient configurations of the invention are the subject of the dependent claims.

[0010] Further objectives and advantages of the invention will become apparent from the following description of an embodiment of the invention with reference to the figures of the drawing. [Brief explanation of the drawings]

[0011] [Figure 1] 1 shows a front view of an embodiment of a cutting wheel according to the present invention equipped with a tool condition monitoring device; FIG. [Figure 2] 1 is a schematic rear view of an embodiment of a cutting wheel according to the present invention, along with details of a tool condition monitoring device; FIG. [Figure 3] 2 shows a perspective view of a portion of the cutting wheel of FIG. 1 in the region of a radially outer remover (bucket), which is an example of an excavation tool; FIG. [Figure 4] FIG. 2 is a perspective view of an embodiment of a remover monitoring module of a tool condition monitoring device. [Figure 5] FIG. 5 is a top view of the eliminator monitoring module of FIG. 4. [Figure 6] 2 shows a perspective view of a portion of an embodiment of the cutting wheel of FIG. 1 in the area of ​​a scraping knife (scraper), which is an example of one group of excavation tools, focusing on the front part located at the front in the excavation direction. [Figure 7] 2 shows a part of the embodiment of the cutting wheel of FIG. 1 in the region of the scraping knife, in a perspective view focused on the rear part located on the rear side in the excavation direction. [Figure 8] 8 shows the device of FIGS. 6 and 7 in cross section, with a scraping knife and an intermediate part of the tool condition monitoring device attached to a support plate together with the scraping knife. FIG. [Figure 9] 10 shows a cross-sectional view of two cutting rollers as a further example of a group of excavation tools in the cutting wheel embodiment of FIG. 1 with an intermediate support bolt of the tool condition monitoring device. [Example]

[0012] Figure 1 shows a cutting wheel 103 for a tunnel boring machine in a front view (or end view) focusing on the front part that is located forward in the direction of excavation and faces the adjacent geology during excavation. The cutting wheel 103 in Figure 1 has a number of cutting arms 106 that extend radially outward from a central center area in the form of spokes to the outer periphery of the cutting wheel 103. A number of waste intake openings 109 are defined between the cutting arms 106 (circumferentially), through which material excavated from the adjacent geology can be removed in the opposite direction to the direction of excavation.

[0013] In the illustrated embodiment, the cutting arm 106 is equipped with a number of various types of excavation tools for scraping away the adjacent soil. The excavation tools of the type used in the cutting wheel 103 of FIG. 1 include a remover (Raeumer) 112 disposed radially outward, scraping knives (Schaelmesser) 115 disposed between the remover 112 and the central region, and cutting rollers (Schneidrollen) 118. In this case, the remover 112 and the scraping knives 115 are disposed on both sides of the cutting arm 106 in the circumferential direction and protrude from the cutting arm 106, while the cutting rollers 118 are attached to the central region of the cutting arm 106 in the circumferential direction.

[0014] As will be explained in detail in the following paragraphs, the cutting wheel 103 of Fig. 1 is equipped with a tool condition monitoring device that is used to monitor the wear state of one drilling tool, one group of drilling tools, here in the form of individual removers 112, the wear state of multiple groups of scraping knives 115, or the wear state of multiple pairs of cutting rollers 118, and in this example the tool condition monitoring device has support members assigned to a predetermined number of individual drilling tools or groups of drilling tools, where these support members are structurally separated and spatially spaced from the individual drilling tools or groups of drilling tools and are detachably connected to a cutting arm 106 that is part of the frame structure of the cutting wheel 103.

[0015] In the embodiment of FIG. 1, the support members are configured as intermediate plates 121 each assigned to one remover 112 as one type of intermediate member, intermediate bar members 124 each assigned to one group of scraping knives 115 as another type of intermediate member, and a support bolt 127 arranged between two cutting rollers 118.

[0016] 2 shows, in a schematic rear view, on the one hand, a portion of the cutting wheel 103 in the region of the cutting arm 106 and, on the other hand, further components of the tool condition monitoring device according to the described embodiment. From the view in FIG. 2, it can be seen that the radially outer remover 112 is connected to the frame structure 203 of the corresponding cutting arm 106 via an intermediate plate 121 located therebetween. The intermediate plate 121 is connected to a line connection box 209 of the tool condition monitoring device via three pipe connections 206 of the tool condition monitoring device, which are shown exposed in FIG. 2. The line connection box 209 is in turn connected to an interconnection box 215 of the tool condition monitoring device via line hoses 212 of the tool condition monitoring device. The connection between the line hoses 212 and the interconnection box 215, which is shown open in FIG. 2 with its closure removed, is made by a cable passage 218, which provides a dust- and moisture-tight seal. Disposed within the interconnection box 215 is a removable plug connection (connector) 221 for the tool condition monitoring device.

[0017] The or each interconnection box 215 is also connected via the encapsulated cable harness 224 of the tool condition monitoring device to a transmitting unit 230 of the tool condition monitoring device having a transmitting antenna 227, and using the transmitting unit 230, the signals of the tool condition monitoring device can be supplied wirelessly via a wireless connection 233 to a receiving unit 239 of the tool condition monitoring device having a receiving antenna 236. The receiving unit 239 is also connected wirelessly or via a cable connection to a data processing unit 242 of the tool condition monitoring device, and using the data processing unit 242, the signals of the tool condition monitoring device and therefore the wear state of the monitored drilling tools 112, 115, 118 can be monitored.

[0018] Fig. 3 shows in perspective view a portion of the radially outer edge region of the cutting arm 106 of the cutting wheel 103 shown in Fig. 1. From the drawing in Fig. 3, it can be seen that the radially outer, multi-part remover 112 is configured in an arc shape, for example, via an arc segment of approximately 90 degrees, inclined in the rotation direction of the cutting wheel 103, and is connected (coupled) to the frame structure 203 of the cutting arm 106 via an intermediate plate 121. In the embodiment shown in Fig. 3, a base plate 303 welded to the frame structure 203 is further arranged between the intermediate plate 121 and the frame structure 203, and the base plate 303 receives a line connection box 209 arranged under a base plate cover member 306 in the drawing in Fig. 3. The line hose 212 described on the basis of FIG. 2 is arranged in a hose duct 309 of the tool condition monitoring device to protect it from external influences, and the hose duct 309 is attached to the rear side of the cutting arm 106 in the drilling direction.

[0019] Furthermore, in Figure 3, a number of attachment bits 315 are shown as a further type of drilling tool, protruding in the excavation direction and arranged in a recess in the wear protection plate 312 approximately in the center of the front part of the cutting arm 106, or arranged in an edge area located radially outward, but in this embodiment the wear state of these attachment bits 315 is not monitored.

[0020] Figure 4 shows in a perspective view the devices constituting the remover monitoring module, which are connected together as a structural unit, and which consist of the intermediate plate 121, the pipe connection 206, the line connection box 209, the line hose 212, a connection flange member 403 for mechanically connecting the line hose 212 to the interconnection box 215 (not shown in Figure 4), and a plug connection member 406 of the tool condition monitoring device for electrical connection to the plug connection member 221 (not shown in Figure 4). Figure 4 also shows an eyebolt 409 connected to the intermediate plate 121, which is used for handling the structural unit comprising the intermediate plate 121, in particular for easy positioning. The intermediate plate 121 is closed by an intermediate plate cover member 412 on the side facing the corresponding remover 112 in the normal installation. FIG. 4 also shows mounting bolts 415 engaged with the line connection box 209 , which are used to secure the line connection box 209 to the frame structure 203 .

[0021] 5 shows the device of FIG. 4 in a top view in the region of the intermediate plate 121, in which the intermediate plate cover element 412 is shown cut open (as a cutaway cross section) in the region of one of the pipe connections 206. On the one hand, it can be seen from FIG. 5 that both the intermediate plate 121 and the intermediate plate cover element 412 have a number of through-holes 503 through which fixing bolts (or fixing screws, not shown in FIG. 5) can be engaged in order to connect the remover 112 to the base plate 303, which is welded to the frame structure 203 and has threaded sections assigned to the through-holes 503. Furthermore, the view of FIG. 5 reveals that each pipe connection 206 is arranged in a pipe connection groove 506 and is terminated, on the side opposite the line connection box 209, by a threaded clamping element 509 and by a cable threaded connection 512.

[0022] 5 shows that in the illustrated cable screw connection 512 a circuit cable 515 is arranged as an electrically conductive current conductor element of the tool condition monitoring device, which current conductor element is electrically insulated from the outside and is arranged in a cable groove 518 formed in the intermediate plate 121 as a cable-receiving recess. The cable groove 518 extends from the end of the pipe connection groove 506 in the direction of the area (of the intermediate plate 121) which is located forward in the drilling direction, and behind the outer material wall 521 of the intermediate plate 121 in the drilling direction, along a contour which is geometrically similar to the front face of the remover 112 (see FIG. 3), but which contour is offset backward in the opposite direction to the drilling direction with respect to the front face of the remover 112 which has not yet been used.

[0023] The pairs of circuit cables 515 located in the pipe connection 206 are connected to a voltage source of a tool condition monitoring device (not shown in Figure 5) and, in operation, typically have a current flowing through them when the cutting wheel 103 is operating to excavate the adjacent (abutting) earth. As soon as the wear of the excavation tool remover 112, which is an example of an excavation tool, is caused by excavation and the outer material wall 521 is at least locally (or partially) removed, this is usually directly followed by the failure (or breakage) of at least one circuit cable 515, which is accompanied by at least a temporary interruption of the current flowing through the circuit cables 515. This interruption of the current flow thereby indicates that a wear limit has been reached that is directly correlated (or related) to the wear state of the corresponding excavator 112.

[0024] This wear limit can be fixed relatively easily by the mounting position of the intermediate plate 121 relative to the remover 112 and by the position of the cable groove 518, which is spaced from the front side of the intermediate plate 121, which is normally located forward in the direction of excavation. Furthermore, if the lower limit is reached due to wear of the remover 112, making replacement of the remover 112 necessary, the worn intermediate plate 121, which is likewise no longer usable as a structural unit, of the remover monitoring module together with the worn remover 112 is replaced by a new remover monitoring module of Figure 4, which comprises a new intermediate plate 121 with a new circuit cable 515, which is achieved by simply removing and re-threading the bolts (or screws) and plug connections.

[0025] Figure 6 shows a perspective view of the cutting arm 106 area of ​​the cutting wheel 103 in Figure 1, focusing on the front portion located at the front in the excavation direction. Figure 6 illustrates a predetermined number of scraping knives 115 as one group of excavation tools, and these scraping knives 115 are connected to the frame structure 203 of the cutting arm 106 via a common intermediate bar member 124 extending in the radial direction of the cutting arm 106 using a scraping knife fixing bolt 603. The intermediate bar member 124 is configured in two stages, having a thicker base portion 606 located at the rear in the excavation direction and a worn portion 609 located at the front in the excavation direction and thinner than the base portion 606.

[0026] The base portion 606 extends with a continuous rectangular cross section in the longitudinal direction of the intermediate bar member 124, whereas the worn portion 609 follows (or has) a geometrically similar contour, offset in the opposite direction to the direction of tunneling relative to the scraping knife 115 attached to the intermediate bar member 124, so that the worn portion 609 is comb-shaped in the longitudinal direction and has a stepped configuration with a protruding region 612 formed in the region of the scraping knife 115 and a recessed region 615 offset in the direction of tunneling relative to the direction of tunneling. Advantageously, the recessed region 615 terminates at the front side with the frame structure 203.

[0027] In order to mechanically stabilize the worn portion 609, a support base 618 is attached to the frame structure 203, which is located opposite the scraping knife 115 and is in contact with the underside of the worn portion 609 opposite the scraping knife 115, and the front side of the support base 618, which is located on the front side in the excavation direction, slightly protrudes from the corresponding front side of the worn portion 609 for reliable protection.

[0028] Figure 7 shows a perspective view of the device according to Figure 6, focusing on the area of ​​the rear cutting arm 106 in the direction of tunneling. It can be seen from Figure 7 that the rear part of the intermediate bar element 124 in the direction of tunneling is provided with a multi-component cable duct arrangement 703 of the tool condition monitoring device, which has a U-shaped base part 706 and a flat cover part 709, and which abuts the intermediate bar element 124, is bent along the frame structure 203 of the cutting arm 106, and extends towards the rear side of the frame structure 203 in the direction of tunneling. As will be explained in more detail in the following paragraphs, a conductive circuit cable 515, not visible in Figure 7, is arranged as a conductive current conductor element in a manner protected from external mechanical influences.

[0029] Figure 8 shows a cross-sectional view of a region of the device of Figures 6 and 7, with a cross-section of the scraping knife 115. It can be seen from Figure 8 that the electrically conductive circuit cable 515 is guided into the intermediate bar element 124 via the line hose 803 of the tool condition monitoring device and via the cable passage 806 and runs in the cable groove 518, particularly in the region of the respective front worn section 609 in the direction of advance, with the cable groove 518 extending back in the worn section 609 relative to its front face in the direction of advance in normal use. It can also be seen from the view of Figure 8 that the worn section 609 is removably closed on the side facing the scraping knife 115 in normal use by a closure element 809 via a screw (or bolt) connection, thereby covering the cable groove 518.

[0030] Once the predetermined wear limit of the scraping knife 115 has been exceeded, the corresponding worn portion 609 is also subject to significant wear, until the circuit cable 515 is finally interrupted within a predetermined area, and due to the arrangement of the worn portion 609 of the intermediate bar member 124, which is offset back relative to the front part of the scraping knife 115 located forward in the direction of excavation, the worn portion 609 remains protected in both directions of rotation of the cutting wheel 103 by the protruding area of ​​the scraping knife 115 and by the support base 618. As carried out in connection with the above explanation, the interruption of the corresponding electric circuit can be detected.

[0031] Here too, based on appropriate dimensioning of the size of the worn area 609, in particular with respect to the size of the worn area 609 in the direction of excavation, and on appropriate dimensioning of the position of the cable groove 518, it is possible to achieve an adaptation to predetermined wear limits for excavation tools such as the scraping knives 115. Furthermore, the intermediate bar elements 124 can be relatively easily replaced together with the scraping knives 115 during maintenance, or groups of scraping knives 115 can be retrofitted by attaching intermediate bar elements 124 in order to monitor their wear state.

[0032] 9 shows a cross-sectional view of a support bolt 127, which is a further example of a support member and is arranged between two cutting rollers 118 as an embodiment of a cutting tool. The support bolt 127 is substantially cylindrical and is removably fixedly connected to the frame structure 203 of the corresponding cutting arm 106 by an end (front) holder 903 arranged on the front side in the excavation direction and via a foot (rear) holder 906 arranged on the rear side in the excavation direction.

[0033] A blind hole recess 909 is provided in the support bolt 127, which is formed in the shape of a blind hole (counter hole) closed at one end, and the blind hole recess 909 opens in the area of ​​the foot region of the support bolt 127, which is fixed in position by the foot holder 906, and terminates at a predetermined wear distance from the front part of the support bolt 127, which is located forward in the drilling direction when in normal use.

[0034] An electrically conductive circuit cable 515 is arranged in the blind hole recess 909 as one embodiment of a circuit element (current conductor element), which extends up to the area of ​​the blind hole recess 909 on the front side in the drilling direction, exits via a cable passage 912 in the foot area of ​​the support bolt 127 on the opposite side, and extends within a cable channel 915 of the tool condition monitoring device, which is attached to the frame structure 203 of the cutting arm 106 on the rear side in the drilling direction.

[0035] 9, it can be seen that the front face of the support bolt 127, which is located forward in the direction of tunneling, is displaced backward in the opposite direction relative to the corresponding front face of the unused cutting roller 118, thereby corresponding to the embodiment described above in connection with the remover 112 and scraping knife 115, so that when wear of the cutting roller 118 increases to a characteristic wear limit, material is also removed from the support bolt 127, which is located forward in the direction of tunneling, and after the blind hole recess 909 is exposed in the front area of ​​the support bolt 127, the electrical current conduction in the properly connected circuit cable 515 is also interrupted. This is characteristic of reaching a predetermined wear limit, so that corresponding maintenance measures can be initiated in good time. [Explanation of symbols]

[0036] 103 Cutting Wheel 106 Cutting Arm 109 Refuse intake opening 112 Excavation tools: Remover (bucket) 115 Excavation tools: scraping knives (scrapers) 118 Drilling tools: Cutting rollers (disc cutters) 121 Intermediate Plate 124 Intermediate bar member 127 Support bolt 203 Frame Structure 206 Pipe Connection 209 Line Connection Box 212 Line Hose 215 Interconnection Box 218 Cable passage 221 Plug connection 224 Cable Harness 227 Transmitting Antenna 230 Transmitting Unit 233 Wireless Connection Path 236 Receiving Antenna 239 Receiving Unit 242 Data Processing Unit 303 Base Plate 306 Base plate cover member 309 Hose duct 312 Wear protection plate 315 Mounting Tool 403 Connection flange member 406 Plug connection 409 Eyebolt 412 Intermediate plate cover member 415 Mounting bolt 503 Through hole section 506 Pipe connection groove 509 Threaded clamping members 512 Cable Thread Connection 515 Circuit Cable 518 Cable groove 521 Outer material wall 603 Scraper knife fixing bolt 606 Base 609 Worn parts 612 Prominent area 615 Attraction Area 618 Support base 703 Cable duct device 706 Base 709 Cover 803 Line Hose 806 Cable passage 809 Closing cover member 903 End Holder 906 Foot Holder 909 Blind hole recess 912 Cable passage 915 cable channels

Claims

1. A cutting wheel for a tunnel boring machine, comprising: a predetermined number of excavation tools (112, 115) for cutting away geology adjacent to the cutting wheel (103) in the excavation direction during excavation; and a tool condition monitoring device for monitoring the wear conditions of the excavation tools (112, 115), the tool condition monitoring device comprises at least one support member (121, 124) assigned to one drilling tool (112, 115) and / or one group of drilling tools (112, 115), the support member (121, 124) being spatially separated from the one drilling tool (112, 115) or one group of drilling tools (112, 115) and removably connected to a frame structure (203); At least one conductive current conductor element (515) is embedded in the support member (121, 124), the current conductor element (515) is embedded in such a way that it can be interrupted after a wear of the support element (121, 124) that is characteristic for a predetermined wear state of a drilling tool (112, 115) and / or a group of drilling tools (112, 115), the support member is configured as an intermediate member (121, 124), the intermediate member (121, 124) being arranged between one drilling tool (112, 115) and / or one group of drilling tools (112, 115) and the frame structure (203); the intermediate element (121, 124) follows a geometrically similar contour of the front surface of the drilling tool (112, 115) or group of drilling tools (112, 115) located forward in the direction of drilling, the front surface of the intermediate element (121, 124) located forward in the direction of drilling being offset backward in the opposite direction of the drilling direction with respect to the contour of the front surface of the drilling tool (112, 115) and / or group of drilling tools (112, 115) located forward in the direction of drilling; and the intermediate member (121, 124) has a cable receiving recess (518) at a predetermined distance from the front side of the intermediate member (121, 124), the cable receiving recess (518) extending behind the outer material wall (521) of the intermediate member (121) in the direction of tunneling, and the current conductor element (515) is arranged in the cable receiving recess (518); A cutting wheel characterized by:

2. A cutting wheel for a tunnel boring machine, comprising: a predetermined number of excavation tools (118) for cutting away geology adjacent to the cutting wheel (103) in the direction of excavation during excavation; and a tool condition monitoring device for monitoring the wear state of the excavation tools (118), the tool condition monitoring device comprises at least one support member (127) assigned to one drilling tool (118) and / or one group of drilling tools (118), the support member (127) being spatially separated from the one drilling tool (118) or one group of drilling tools (118) and removably connected to a frame structure (203); At least one conductive current conductor element (515) is embedded within the support member (127); the current conductor element (515) is embedded in such a way that it can be interrupted after a wear of the support member (127) that is characteristic for a predetermined wear state of a drilling tool (118) and / or a group of drilling tools (118); and the support member is configured as a support bolt (127), the support bolt (127) being arranged at a predetermined lateral distance from at least one drilling tool (118); A cutting wheel characterized by:

3. a front surface of the support bolt (127) located forward in the excavation direction is shifted backward in the opposite direction to the excavation direction relative to a front surface of the drilling tool (118) adjacent to the support bolt (127) located forward in the excavation direction; The cutting wheel of claim 2 ,

4. the support bolt (127) has a blind hole recess (909) extending in the longitudinal direction, and the current conductor element (515) is disposed within the blind hole recess (909); The cutting wheel of claim 2 ,

5. the current conductor element (515) terminates at a predetermined distance from the front face of the support bolt (127); The cutting wheel of claim 2 ,

6. the current conductor element (515) is disposed at a predetermined distance from the front surface of the support member (121, 124, 127) located at the front side in the excavation direction; 3. The cutting wheel according to claim 1 or 2, characterized in that:

7. the current conductor element (515) is an insulated current conductor cable (515); 3. The cutting wheel according to claim 1 or 2, characterized in that:

8. the support members (121, 124, 127) are connected to a line guiding device of the tool condition monitoring device, and the line guiding device is removably connected to the frame structure (203); 3. The cutting wheel according to claim 1 or 2, characterized in that:

9. the line guide device is encapsulated against external mechanical influences; The cutting wheel of claim 8 .

10. The line guide device is connected to a line connection box (209) on the side opposite to the support member (121, 124, 127), and a pipe connection part (206) is connected to the inside of the line connection box (209); The cutting wheel of claim 8 .

11. the line connection box (209) is connected to an interconnection box (215) via a line hose (212), in which a removable plug connection part (221) of the tool condition monitoring device is arranged, and the interconnection box (215) is connected to a data transmission unit; The cutting wheel of claim 10 ,

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