Cutting big arm and heading machine

Abstract

The utility model provides a large cutting arm and a heading machine, and relates to the technical field of heading machines. The large cutting arm comprises a sliding mechanism, an arm frame, a lifting mechanism, a cutter head frame and a dust removal mechanism; the arm frame is rotationally arranged on the sliding mechanism, and the lifting mechanism is arranged on the sliding mechanism and connected with the arm frame so as to drive the arm frame to swing around the sliding mechanism; the sliding mechanism is used for being arranged on the heading machine to drive the arm frame and the lifting mechanism to move synchronously. The cutter head frame is arranged on the arm frame and is used for clamping a tunneling cutter; the dust removal mechanism comprises a dust removal air duct and a moving assembly, the moving assembly is arranged on the arm frame, one end of the dust removal air duct is connected with the moving assembly, the other end is connected with a dust remover, and the moving assembly is used for driving the dust removal air duct to move close to or away from the cutterhead frame. The cutting big arm provided by the utility model is beneficial to improving the dust adsorption effect.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel boring machines, and in particular to a cutting boom and a tunnel boring machine. Background Art

[0002] The roadheader is mainly composed of cutting device, walking device, transport device, dust removal device and hydraulic electrification components. The roadheader has the advantages of strong rock breaking ability, high degree of integration and high mining and excavation efficiency, and is widely used in mining operations such as coal mine tunnels and mountain tunnels.

[0003] In small and medium sections, cantilevered tunnel boring machines are generally used due to the influence of tunnel height and width. The overall height and width of the cantilevered tunnel boring machine are limited. In order to improve mining efficiency, airborne dust removal devices are generally not used or are not equipped. Instead, the dust removal device is placed behind the tunnel boring machine and moves with the tunnel boring machine as it moves forward.

[0004] The dust removal duct in the existing cantilever tunnel boring machine is directly connected to the dust collector or adopts a separate design, so that the air suction port is far away from the dust source, and the dust removal effect is not good. If the air suction port is arranged at the dust source, the dust removal equipment needs to be gradually moved with the tunnel boring machine, and it is inconvenient to disassemble and assemble the air duct in a low tunnel. Utility Model Content

[0005] The present application provides a cutting boom and a tunnel boring machine, which are used to solve the problem of poor dust removal effect of a cantilever tunnel boring machine.

[0006] On the one hand, the present application provides a cutting boom, including a sliding mechanism, an arm frame, a lifting mechanism, a cutter head frame and a dust removal mechanism;

[0007] The arm is rotatably arranged on the sliding mechanism, the lifting mechanism is arranged on the sliding mechanism and connected to the arm to drive the arm to swing around the sliding mechanism; the sliding mechanism is used to be arranged on the tunnel boring machine to drive the arm and the lifting mechanism to move synchronously; the cutter head frame is arranged on the arm to clamp the tunneling tool; the dust removal mechanism includes a dust removal air duct and a moving component, the moving component is arranged on the arm, one end of the dust removal air duct is connected to the moving component, and the other end is used to connect with the dust collector, and the moving component is used to drive the dust removal air duct to move toward or away from the cutter head frame.

[0008] In some embodiments, the dust removal air duct includes an air suction port and a transition air duct, one end of the transition air duct is arranged on the arm and connected to the air suction port; the other end of the transition air duct is used to connect to the dust collector.

[0009] In some embodiments, the transition air duct includes a flexible portion and two rigid portions, the rigid portions are respectively arranged at two ends of the flexible portion, and the moving component is connected to the rigid portions.

[0010] In some embodiments, the dust removal air duct further includes a rotating component, and the rotating component is disposed on the transition air duct to drive the air suction port to swing.

[0011] In some embodiments, the rotating assembly includes a connecting pin, a flexible connecting sleeve and a first driving member, the flexible connecting sleeve is respectively connected to the suction port and the transition air duct to seal the gap between the suction port and the transition air duct, the connecting pin is rotatably arranged at the end of the transition air duct, the end of the suction port is fixed on the connecting pin, and the first driving member is arranged on the transition air duct and connected to the connecting pin to drive the connecting pin to rotate.

[0012] In some embodiments, sealing plates are provided on both sides of the transition air duct, and the sealing plates abut against the side walls of the air suction port.

[0013] In some embodiments, the moving component includes a connecting plate and a second driving member. A sliding groove is opened on the arm, and the connecting plate is slidably set in the sliding groove. The rigid part is connected to the connecting plate. The second driving member is set on the arm and connected to the connecting plate to drive the connecting plate to slide in a direction close to or away from the tool disc frame.

[0014] In some embodiments, the connection disk is a magnetic suction cup, and the rigid part is adsorbed on the connection disk.

[0015] In some embodiments, the distance between the air suction port and the blade holder is less than or equal to 3 m.

[0016] On the other hand, the present application provides a tunnel boring machine, comprising a tunnel boring machine body and a cutting arm as described above arranged on the tunnel boring machine body.

[0017] The present application provides a cutting boom and a tunnel boring machine, wherein the cutting boom comprises a sliding mechanism, an arm frame, a lifting mechanism, a cutter head frame and a dust removal mechanism, wherein the dust removal mechanism comprises a dust removal duct and a moving component, wherein the dust removal duct is arranged on the arm frame so as to absorb dust near the cutting position of the tunnel boring machine; and the dust removal duct moves synchronously with the movement of the arm frame so that the air inlet of the dust removal duct always remains at a position close to the dust source, which is conducive to quickly absorbing the dust generated by the cutting and improving the dust removal effect of the tunnel boring machine; the moving mechanism can also drive the dust removal duct to slide in a direction close to or away from the cutter head frame, so as to adjust the position of the dust removal duct so as to make the dust removal duct closer to the dust source. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] Figure 1 A schematic diagram of the structure of a cutting arm provided in an embodiment of the present application;

[0020] Figure 2 for Figure 1 Structural diagram of the middle sliding mechanism;

[0021] Figure 3 for Figure 1 Structural diagram of the dust removal mechanism;

[0022] Figure 4 for Figure 1 Schematic diagram of the structure of the central air intake.

[0023] Description of reference numerals:

[0024] 100, sliding mechanism; 110, guide column; 120, guide cylinder; 130, sliding frame; 140, rotary assembly; 150, rotary drive;

[0025] 200, arm support; 210, connecting frame; 220, mounting arm; 221, slideway;

[0026] 300, lifting mechanism;

[0027] 400, knife tray;

[0028] 500, dust removal mechanism; 510, dust removal air duct; 511, air suction port; 512, transition air duct; 5121, flexible portion; 5122, rigid portion; 513, sealing plate; 520, moving component; 521, connecting disk; 522, second driving member; 530, rotating component; 531, connecting pin; 532, flexible connecting sleeve.

[0029] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0031] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] The roadheader is mainly composed of cutting device, walking device, transport device, dust removal device and hydraulic electrification components. The roadheader has the advantages of strong rock breaking ability, high degree of integration and high mining and excavation efficiency, and is widely used in mining operations such as coal mine tunnels and mountain tunnels.

[0035] In small and medium sections, cantilevered tunnel boring machines are generally used due to the influence of tunnel height and width. The overall height and width of the cantilevered tunnel boring machine are limited. In order to improve mining efficiency, airborne dust removal devices are generally not used or are not equipped. Instead, the dust removal device is placed behind the tunnel boring machine and moves with the tunnel boring machine as it moves forward.

[0036] The dust removal duct in the existing cantilever tunnel boring machine is directly connected to the dust collector or adopts a separate design, so that the air suction port is far away from the dust source, and the dust removal effect is not good. If the air suction port is arranged at the dust source, the dust removal equipment needs to be gradually moved with the tunnel boring machine, and it is inconvenient to disassemble and assemble the air duct in a low tunnel.

[0037] In order to solve the above-mentioned problems, the present application provides a cutting boom and a tunnel boring machine. The cutting boom includes a sliding mechanism, an arm frame, a lifting mechanism, a cutter head frame and a dust removal mechanism. The dust removal mechanism includes a dust removal air duct and a moving component. The dust removal air duct is arranged on the arm frame to absorb dust near the cutting position of the tunnel boring machine; and the dust removal air duct moves synchronously with the movement of the arm frame, so that the air inlet of the dust removal air duct always remains at a position close to the dust source, which is conducive to quickly absorbing the dust generated by the cutting and improving the dust removal effect of the tunnel boring machine; the moving mechanism can also drive the dust removal air duct to slide in the direction close to or away from the cutter head frame, so as to adjust the position of the dust removal air duct so that the dust removal air duct is closer to the dust source.

[0038] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0039] On the one hand, the present application provides a cutting arm, referring to Figures 1 to 4 The cutting arm includes a sliding mechanism 100, an arm frame 200, a lifting mechanism 300, a cutter head frame 400 and a dust removal mechanism 500.

[0040] The boom 200 is rotatably arranged on the sliding mechanism 100, and the lifting mechanism 300 is arranged on the sliding mechanism 100 and connected to the boom 200 to drive the boom 200 to swing around the sliding mechanism 100; the sliding mechanism 100 is used to be arranged on the tunnel boring machine to drive the boom 200 and the lifting mechanism 300 to move synchronously; the cutter head frame 400 is arranged on the boom 200 to clamp the tunnel boring tool.

[0041] The dust removal mechanism 500 includes a dust removal duct 510 and a movable component 520. The movable component 520 is arranged on the arm 200. One end of the dust removal duct 510 is connected to the movable component 520, and the other end is used to connect to the dust collector. The movable component 520 is used to drive the dust removal duct 510 to move toward or away from the blade holder 400.

[0042] By adopting the above-mentioned technical solution, the dust removal duct 510 is set on the boom 200, so as to absorb the dust near the cutting point of the tunnel boring machine; and the dust removal duct 510 moves synchronously with the movement of the boom 200, so that the air inlet of the dust removal duct 510 is always maintained at a position close to the dust source, which is conducive to quickly absorbing the dust generated by the cutting and improving the dust removal effect of the tunnel boring machine; the moving mechanism can also drive the dust removal duct 510 to slide in the direction close to or away from the cutter head frame 400, so as to adjust the position of the dust removal duct 510 so that the dust removal duct 510 is closer to the dust source.

[0043] Among them, refer to Figure 1 and Figure 2 The sliding mechanism 100 includes a guide column 110, a guide cylinder 120, a sliding frame 130, a slewing assembly 140 and a slewing driver 150. Two guide columns 110 are provided, and the two guide columns 110 are fixed in parallel on the frame of the tunnel boring machine. Two guide cylinders 120 are provided, and the two guide cylinders 120 are fixed in parallel at the bottom of the sliding frame 130. The guide cylinder 120 is slidably sleeved on the guide column 110. A telescopic driver is installed on the frame of the tunnel boring machine, and the telescopic driver is connected to the sliding frame 130, thereby driving the sliding frame 130 to slide on the guide column 110. The telescopic driver is a hydraulic cylinder.

[0044] The slewing assembly 140 includes a slewing connection seat, a slewing bearing and a driver. The axis of the slewing bearing is arranged in the vertical direction. The slewing bearing is installed on the top of the sliding frame 130. The inner ring of the slewing bearing is fixedly connected to the sliding frame 130. The slewing connection seat is installed on the slewing bearing and is fixedly connected to the outer ring of the slewing bearing. Two connecting shafts are symmetrically arranged on the slewing connection seat, and the connecting shafts deviate from the axis of the slewing bearing. The driver is two hydraulic cylinders, the piston rods of the hydraulic cylinders are respectively hinged to the two connecting shafts, the cylinder bodies of the hydraulic cylinders are hinged to the sliding frame 130, and the ends of the arm 200 are fixed to the slewing connection seat through pins. Therefore, the arm 200 is driven to swing left and right under the cooperation of the two hydraulic cylinders.

[0045] Among them, refer to Figure 1 and Figure 2The arm 200 includes a connecting frame 210 and a mounting arm 220. The connecting frame 210 is a fork-shaped structure. The connecting frame 210 is fixed on the rotary connecting seat. One end of the mounting arm 220 is hinged to one end of the connecting frame 210, and the hinge axis of the mounting arm 220 is in the horizontal direction. The lifting assembly is a hydraulic cylinder. The piston rod of the hydraulic cylinder is hinged to the mounting arm 220. The cylinder body of the hydraulic cylinder is hinged to the connecting frame 210 and is located at the bottom of the mounting arm 220, so that the mounting arm 220 is driven to swing up and down by the telescopic piston rod of the hydraulic cylinder. The dust removal air duct 510 is installed on the mounting arm 220, and the cutter head frame 400 is installed at the end of the mounting arm 220.

[0046] In some embodiments, reference Figure 1 and Figure 3 The dust removal air duct 510 includes an air suction port 511 and a transition air duct 512. One end of the transition air duct 512 is arranged on the arm 200 and connected to the air suction port 511; the other end of the transition air duct 512 is used to connect to the dust collector.

[0047] The dust collector may be directly installed on the tunnel boring machine, or may be connected to a separate dust collector by extending the dust removal air duct 510, and no excessive restrictions are imposed here.

[0048] Further, see Figure 3 and Figure 4 The transition air duct 512 includes a flexible portion 5121 and two rigid portions 5122 . The rigid portions 5122 are respectively arranged at two ends of the flexible portion 5121 , and the moving component 520 is connected to the rigid portions 5122 .

[0049] The flexible part 5121 adopts a flexible skeleton structure, so that the flexible part 5121 can be extended and retracted following the swing of the mounting arm 220, so as to facilitate the installation of the air inlet 511 on the mounting arm 220, and thus closer to the dust source. The rigid part 5122 is convenient to be connected to the dust collector by bolts.

[0050] In some embodiments, the dust removal air duct 510 further includes a rotating assembly 530 , which is disposed on the transition air duct 512 to drive the air suction port 511 to swing.

[0051] By setting the rotating assembly 530, the air suction port 511 is driven to rotate, so as to adjust the angle of the air suction port 511, which is more conducive to the absorption of dust.

[0052] In some embodiments, reference Figure 1 and Figure 3The rotating assembly 530 includes a connecting pin 531, a flexible connecting sleeve 532 and a first driving member. The flexible connecting sleeve 532 is respectively connected to the air suction port 511 and the transition air duct 512 to seal the gap between the air suction port 511 and the transition air duct 512. The connecting pin 531 is rotatably arranged at the end of the transition air duct 512. The end of the air suction port 511 is fixed on the connecting pin 531. The first driving member is arranged on the transition air duct 512 and connected to the connecting pin 531 to drive the connecting pin 531 to rotate.

[0053] The flexible connection sleeve 532 is a fan-shaped retractable flexible sleeve, one end of which is connected to the air inlet 511, and the other end is connected to the rigid part 5122 of the transition air duct 512, thereby realizing a sealed connection between the air inlet 511 and the transition air duct 512. The connecting pin 531 is rotatably connected to the upper end of the rigid part 5122 of the transition air duct 512, and the end of the air inlet 511 is fixed to the connecting pin 531, so that the air inlet 511 is hinged to the transition air duct 512 and rotates around the connecting pin 531, so as to adjust the position of the air inlet 511.

[0054] Exemplarily, the first driving member is a motor. In other embodiments, the first driving member can also be configured as a hydraulic cylinder, which is hinged on the arm 200 and has a certain angle with the air suction port 511, and the piston rod of the hydraulic cylinder is connected to the arm 200, so that the air suction port 511 is driven to rotate through the hydraulic cylinder.

[0055] The transition air duct can be installed on the upper side of the arm 200 or on both sides of the arm 200. When installed on the side wall of the arm 200, the swinging air suction port 511 can absorb the dust above the arm 200 or below the arm 200, further improving the adsorption effect.

[0056] In some embodiments, reference Figure 3 and Figure 4 Sealing plates 513 are provided on both sides of the transition air duct 512 , and the sealing plates 513 abut against the side walls of the air suction port 511 .

[0057] The sealing plates 513 are arranged on both sides of the transition air duct 512 and abut against the side walls of the air inlet 511, thereby protecting the flexible connecting sleeve 532 and achieving a corresponding protective effect; in addition, the sealing plates 513 reduce the dust from entering the flexible protective sleeve and achieve a sealing effect.

[0058] In some embodiments, the moving component 520 includes a connecting plate 521 and a second driving member 522. A slide groove 221 is opened on the arm 200, and the connecting plate 521 is slidably set in the slide groove 221. The rigid part 5122 is connected to the connecting plate 521. The second driving member 522 is set on the arm 200 and connected to the connecting plate 521 to drive the connecting plate 521 to slide in a direction close to or away from the blade holder 400.

[0059] The length direction of the slide groove 221 is parallel to the length direction of the mounting arm 220, the connecting plate 521 is slidably connected in the slide groove 221 along the length direction of the slide groove 221, and the rigid part 5122 is fixed on the connecting plate 521. In the present application, the second driving member 522 is a hydraulic cylinder, which is fixed on the mounting arm 220, and the piston rod of the hydraulic cylinder is connected to the connecting plate 521, thereby driving the connecting plate 521 to slide in the slide groove 221, thereby adjusting the position of the air inlet 511.

[0060] In some embodiments, the connection disk 521 is a magnetic suction cup, and the rigid portion 5122 is adsorbed on the connection disk 521 .

[0061] The rigid part 5122 is magnetically attracted to the magnetic suction cup to improve compatibility with the vacuum cleaner, facilitate disassembly and maintenance, improve the overall integration of the tunnel boring machine, rationally utilize space, and broaden the scope of use of the tunnel boring machine.

[0062] Furthermore, the connection plate 521 and the rigid portion 5122 may be connected by means of snaps, bolts, etc.

[0063] In some embodiments, the distance between the air suction port 511 and the cutter head frame 400 is less than or equal to 3 m. Thus, the air suction port 511 is closer to the cutter head frame 400, and dust can be effectively absorbed when the excavator starts the cutter head excavation operation, thereby improving the visibility of the working environment, providing a good working environment for the operators, and reducing the risk of pneumoconiosis as much as possible.

[0064] On the other hand, the present application provides a tunnel boring machine, comprising a tunnel boring machine body and a cutting arm arranged on the tunnel boring machine body.

[0065] The present application provides a tunnel boring machine, which has a dust removal duct 510 disposed on a boom 200 to absorb dust near the cutting point of the tunnel boring machine; and the dust removal duct 510 moves synchronously with the movement of the boom 200, so that the air inlet of the dust removal duct 510 is always maintained at a position close to the dust source, which is beneficial for quickly absorbing the dust generated by the cutting and improving the dust removal effect of the tunnel boring machine; the moving mechanism can also drive the dust removal duct 510 to slide in a direction close to or away from the cutter head frame 400, so as to adjust the position of the dust removal duct 510 so that the dust removal duct 510 is closer to the dust source.

[0066] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0067] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A cutting boom, characterized in that: It comprises a sliding mechanism (100), an arm frame (200), a lifting mechanism (300), a cutter head frame (400) and a dust removal mechanism (500); The arm (200) is rotatably arranged on the sliding mechanism (100); the lifting mechanism (300) is arranged on the sliding mechanism (100) and connected to the arm (200) to drive the arm (200) to swing around the sliding mechanism (100); the sliding mechanism (100) is used to be arranged on the tunneling machine to drive the arm (200) and the lifting mechanism (300) to move synchronously; the cutter head frame (400) is arranged on the arm (200) to clamp the tunneling tool; The dust removal mechanism (500) comprises a dust removal air duct (510) and a movable component (520); the movable component (520) is arranged on the arm (200); one end of the dust removal air duct (510) is connected to the movable component (520), and the other end is used to be connected to a dust collector; the movable component (520) is used to drive the dust removal air duct (510) to move in a direction close to or away from the blade holder (400).

2. The cutting arm according to claim 1, characterized in that: The dust removal air duct (510) comprises an air suction port (511) and a transition air duct (512); one end of the transition air duct (512) is arranged on the arm (200) and connected to the air suction port (511); the other end of the transition air duct (512) is used to be connected to the dust collector.

3. The cutting arm according to claim 2, characterized in that: The transition air duct (512) comprises a flexible portion (5121) and two rigid portions (5122), wherein the rigid portions (5122) are respectively arranged at two ends of the flexible portion (5121), and the moving component (520) is connected to the rigid portions (5122).

4. The cutting arm according to claim 2, characterized in that: The dust removal air duct (510) further comprises a rotating assembly (530), wherein the rotating assembly (530) is arranged on the transition air duct (512) and is used for driving the air suction port (511) to swing.

5. The cutting arm according to claim 4, characterized in that: The rotating assembly (530) includes a connecting pin (531), a flexible connecting sleeve (532) and a first driving member. The flexible connecting sleeve (532) is respectively connected to the air suction port (511) and the transition air duct (512) to seal the gap between the air suction port (511) and the transition air duct (512). The connecting pin (531) is rotatably arranged at the end of the transition air duct (512). The end of the air suction port (511) is fixed on the connecting pin (531). The first driving member is arranged on the transition air duct (512) and is connected to the connecting pin (531) to drive the connecting pin (531) to rotate.

6. The cutting arm according to claim 4, characterized in that: Sealing plates (513) are provided on both sides of the transition air duct (512), and the sealing plates (513) abut against the side walls of the air suction port (511).

7. The cutting arm according to claim 3, characterized in that: The moving component (520) includes a connecting plate (521) and a second driving member (522). A sliding groove (221) is provided on the arm (200). The connecting plate (521) is slidably arranged in the sliding groove (221). The rigid part (5122) is connected to the connecting plate (521). The second driving member (522) is arranged on the arm (200) and connected to the connecting plate (521) to drive the connecting plate (521) to slide in a direction close to or away from the blade holder (400).

8. The cutting arm according to claim 7, characterized in that: The connection disk (521) is a magnetic suction cup, and the rigid portion (5122) is adsorbed on the connection disk (521).

9. The cutting arm according to any one of claims 2 to 8, characterized in that: The distance between the air suction port (511) and the cutter head frame (400) is less than or equal to 3 m.

10. A tunnel boring machine, characterized in that: It comprises a tunnel boring machine body and a cutting arm as claimed in any one of claims 1 to 9 arranged on the tunnel boring machine body.

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